Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2: (56 commits)
  ocfs2: Make cached block reads the common case.
  ocfs2: Kill the last naked wait_on_buffer() for cached reads.
  ocfs2: Move ocfs2_bread() into dir.c
  ocfs2: Simplify ocfs2_read_block()
  ocfs2: Require an inode for ocfs2_read_block(s)().
  ocfs2: Separate out sync reads from ocfs2_read_blocks()
  ocfs2: Refactor xattr list and remove ocfs2_xattr_handler().
  ocfs2: Calculate EA hash only by its suffix.
  ocfs2: Move trusted and user attribute support into xattr.c
  ocfs2: Uninline ocfs2_xattr_name_hash()
  ocfs2: Don't check for NULL before brelse()
  ocfs2: use smaller counters in ocfs2_remove_xattr_clusters_from_cache
  ocfs2: Documentation update for user_xattr / nouser_xattr mount options
  ocfs2: make la_debug_mutex static
  ocfs2: Remove pointless !!
  ocfs2: Add empty bucket support in xattr.
  ocfs2/xattr.c: Fix a bug when inserting xattr.
  ocfs2: Add xattr mount option in ocfs2_show_options()
  ocfs2: Switch over to JBD2.
  ocfs2: Add the 'inode64' mount option.
  ...

41 files changed, 7353 insertions, 946 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index 501f012e0c6f..9e9d70c02a07 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -220,17 +220,16 @@ config JBD
         tristate
         help
           This is a generic journalling layer for block devices.  It is
-          currently used by the ext3 and OCFS2 file systems, but it could
-          also be used to add journal support to other file systems or block
+          currently used by the ext3 file system, but it could also be
+          used to add journal support to other file systems or block
           devices such as RAID or LVM.
 
-          If you are using the ext3 or OCFS2 file systems, you need to
-          say Y here. If you are not using ext3 OCFS2 then you will probably
-          want to say N.
+          If you are using the ext3 file system, you need to say Y here.
+          If you are not using ext3 then you will probably want to say N.
 
           To compile this device as a module, choose M here: the module will be
-          called jbd.  If you are compiling ext3 or OCFS2 into the kernel,
-          you cannot compile this code as a module.
+          called jbd.  If you are compiling ext3 into the kernel, you
+          cannot compile this code as a module.
 
 config JBD_DEBUG
         bool "JBD (ext3) debugging support"
@@ -254,15 +253,16 @@ config JBD2
         help
           This is a generic journaling layer for block devices that support
           both 32-bit and 64-bit block numbers.  It is currently used by
-          the ext4 filesystem, but it could also be used to add
+          the ext4 and OCFS2 filesystems, but it could also be used to add
           journal support to other file systems or block devices such
           as RAID or LVM.
 
-          If you are using ext4, you need to say Y here. If you are not
-          using ext4 then you will probably want to say N.
+          If you are using ext4 or OCFS2, you need to say Y here.
+          If you are not using ext4 or OCFS2 then you will
+          probably want to say N.
 
           To compile this device as a module, choose M here. The module will be
-          called jbd2.  If you are compiling ext4 into the kernel,
+          called jbd2.  If you are compiling ext4 or OCFS2 into the kernel,
           you cannot compile this code as a module.
 
 config JBD2_DEBUG
@@ -448,7 +448,7 @@ config OCFS2_FS
         tristate "OCFS2 file system support"
         depends on NET && SYSFS
         select CONFIGFS_FS
-        select JBD
+        select JBD2
         select CRC32
         help
           OCFS2 is a general purpose extent based shared disk cluster file
@@ -519,6 +519,16 @@ config OCFS2_DEBUG_FS
           this option for debugging only as it is likely to decrease
           performance of the filesystem.
 
+config OCFS2_COMPAT_JBD
+        bool "Use JBD for compatibility"
+        depends on OCFS2_FS
+        default n
+        select JBD
+        help
+          The ocfs2 filesystem now uses JBD2 for its journalling.  JBD2
+          is backwards compatible with JBD.  It is safe to say N here.
+          However, if you really want to use the original JBD, say Y here.
+
 endif # BLOCK
 
 config DNOTIFY
diff --git a/fs/ocfs2/Makefile b/fs/ocfs2/Makefile
index f6956de56fdb..589dcdfdfe3c 100644
--- a/fs/ocfs2/Makefile
+++ b/fs/ocfs2/Makefile
@@ -34,7 +34,8 @@ ocfs2-objs := \
         symlink.o               \
         sysfile.o               \
         uptodate.o              \
-        ver.o
+        ver.o                   \
+        xattr.o
 
 ocfs2_stackglue-objs := stackglue.o
 ocfs2_stack_o2cb-objs := stack_o2cb.o
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 29ff57ec5d1f..0cc2deb9394c 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -49,6 +49,340 @@
 
 #include "buffer_head_io.h"
 
+
+/*
+ * Operations for a specific extent tree type.
+ *
+ * To implement an on-disk btree (extent tree) type in ocfs2, add
+ * an ocfs2_extent_tree_operations structure and the matching
+ * ocfs2_init_<thingy>_extent_tree() function.  That's pretty much it
+ * for the allocation portion of the extent tree.
+ */
+struct ocfs2_extent_tree_operations {
+        /*
+         * last_eb_blk is the block number of the right most leaf extent
+         * block.  Most on-disk structures containing an extent tree store
+         * this value for fast access.  The ->eo_set_last_eb_blk() and
+         * ->eo_get_last_eb_blk() operations access this value.  They are
+         *  both required.
+         */
+        void (*eo_set_last_eb_blk)(struct ocfs2_extent_tree *et,
+                                   u64 blkno);
+        u64 (*eo_get_last_eb_blk)(struct ocfs2_extent_tree *et);
+
+        /*
+         * The on-disk structure usually keeps track of how many total
+         * clusters are stored in this extent tree.  This function updates
+         * that value.  new_clusters is the delta, and must be
+         * added to the total.  Required.
+         */
+        void (*eo_update_clusters)(struct inode *inode,
+                                   struct ocfs2_extent_tree *et,
+                                   u32 new_clusters);
+
+        /*
+         * If ->eo_insert_check() exists, it is called before rec is
+         * inserted into the extent tree.  It is optional.
+         */
+        int (*eo_insert_check)(struct inode *inode,
+                               struct ocfs2_extent_tree *et,
+                               struct ocfs2_extent_rec *rec);
+        int (*eo_sanity_check)(struct inode *inode, struct ocfs2_extent_tree *et);
+
+        /*
+         * --------------------------------------------------------------
+         * The remaining are internal to ocfs2_extent_tree and don't have
+         * accessor functions
+         */
+
+        /*
+         * ->eo_fill_root_el() takes et->et_object and sets et->et_root_el.
+         * It is required.
+         */
+        void (*eo_fill_root_el)(struct ocfs2_extent_tree *et);
+
+        /*
+         * ->eo_fill_max_leaf_clusters sets et->et_max_leaf_clusters if
+         * it exists.  If it does not, et->et_max_leaf_clusters is set
+         * to 0 (unlimited).  Optional.
+         */
+        void (*eo_fill_max_leaf_clusters)(struct inode *inode,
+                                          struct ocfs2_extent_tree *et);
+};
+
+
+/*
+ * Pre-declare ocfs2_dinode_et_ops so we can use it as a sanity check
+ * in the methods.
+ */
+static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et);
+static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et,
+                                         u64 blkno);
+static void ocfs2_dinode_update_clusters(struct inode *inode,
+                                         struct ocfs2_extent_tree *et,
+                                         u32 clusters);
+static int ocfs2_dinode_insert_check(struct inode *inode,
+                                     struct ocfs2_extent_tree *et,
+                                     struct ocfs2_extent_rec *rec);
+static int ocfs2_dinode_sanity_check(struct inode *inode,
+                                     struct ocfs2_extent_tree *et);
+static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et);
+static struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = {
+        .eo_set_last_eb_blk     = ocfs2_dinode_set_last_eb_blk,
+        .eo_get_last_eb_blk     = ocfs2_dinode_get_last_eb_blk,
+        .eo_update_clusters     = ocfs2_dinode_update_clusters,
+        .eo_insert_check        = ocfs2_dinode_insert_check,
+        .eo_sanity_check        = ocfs2_dinode_sanity_check,
+        .eo_fill_root_el        = ocfs2_dinode_fill_root_el,
+};
+
+static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et,
+                                         u64 blkno)
+{
+        struct ocfs2_dinode *di = et->et_object;
+
+        BUG_ON(et->et_ops != &ocfs2_dinode_et_ops);
+        di->i_last_eb_blk = cpu_to_le64(blkno);
+}
+
+static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_dinode *di = et->et_object;
+
+        BUG_ON(et->et_ops != &ocfs2_dinode_et_ops);
+        return le64_to_cpu(di->i_last_eb_blk);
+}
+
+static void ocfs2_dinode_update_clusters(struct inode *inode,
+                                         struct ocfs2_extent_tree *et,
+                                         u32 clusters)
+{
+        struct ocfs2_dinode *di = et->et_object;
+
+        le32_add_cpu(&di->i_clusters, clusters);
+        spin_lock(&OCFS2_I(inode)->ip_lock);
+        OCFS2_I(inode)->ip_clusters = le32_to_cpu(di->i_clusters);
+        spin_unlock(&OCFS2_I(inode)->ip_lock);
+}
+
+static int ocfs2_dinode_insert_check(struct inode *inode,
+                                     struct ocfs2_extent_tree *et,
+                                     struct ocfs2_extent_rec *rec)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        BUG_ON(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL);
+        mlog_bug_on_msg(!ocfs2_sparse_alloc(osb) &&
+                        (OCFS2_I(inode)->ip_clusters != rec->e_cpos),
+                        "Device %s, asking for sparse allocation: inode %llu, "
+                        "cpos %u, clusters %u\n",
+                        osb->dev_str,
+                        (unsigned long long)OCFS2_I(inode)->ip_blkno,
+                        rec->e_cpos,
+                        OCFS2_I(inode)->ip_clusters);
+
+        return 0;
+}
+
+static int ocfs2_dinode_sanity_check(struct inode *inode,
+                                     struct ocfs2_extent_tree *et)
+{
+        int ret = 0;
+        struct ocfs2_dinode *di;
+
+        BUG_ON(et->et_ops != &ocfs2_dinode_et_ops);
+
+        di = et->et_object;
+        if (!OCFS2_IS_VALID_DINODE(di)) {
+                ret = -EIO;
+                ocfs2_error(inode->i_sb,
+                        "Inode %llu has invalid path root",
+                        (unsigned long long)OCFS2_I(inode)->ip_blkno);
+        }
+
+        return ret;
+}
+
+static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_dinode *di = et->et_object;
+
+        et->et_root_el = &di->id2.i_list;
+}
+
+
+static void ocfs2_xattr_value_fill_root_el(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_xattr_value_root *xv = et->et_object;
+
+        et->et_root_el = &xv->xr_list;
+}
+
+static void ocfs2_xattr_value_set_last_eb_blk(struct ocfs2_extent_tree *et,
+                                              u64 blkno)
+{
+        struct ocfs2_xattr_value_root *xv =
+                (struct ocfs2_xattr_value_root *)et->et_object;
+
+        xv->xr_last_eb_blk = cpu_to_le64(blkno);
+}
+
+static u64 ocfs2_xattr_value_get_last_eb_blk(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_xattr_value_root *xv =
+                (struct ocfs2_xattr_value_root *) et->et_object;
+
+        return le64_to_cpu(xv->xr_last_eb_blk);
+}
+
+static void ocfs2_xattr_value_update_clusters(struct inode *inode,
+                                              struct ocfs2_extent_tree *et,
+                                              u32 clusters)
+{
+        struct ocfs2_xattr_value_root *xv =
+                (struct ocfs2_xattr_value_root *)et->et_object;
+
+        le32_add_cpu(&xv->xr_clusters, clusters);
+}
+
+static struct ocfs2_extent_tree_operations ocfs2_xattr_value_et_ops = {
+        .eo_set_last_eb_blk     = ocfs2_xattr_value_set_last_eb_blk,
+        .eo_get_last_eb_blk     = ocfs2_xattr_value_get_last_eb_blk,
+        .eo_update_clusters     = ocfs2_xattr_value_update_clusters,
+        .eo_fill_root_el        = ocfs2_xattr_value_fill_root_el,
+};
+
+static void ocfs2_xattr_tree_fill_root_el(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_xattr_block *xb = et->et_object;
+
+        et->et_root_el = &xb->xb_attrs.xb_root.xt_list;
+}
+
+static void ocfs2_xattr_tree_fill_max_leaf_clusters(struct inode *inode,
+                                                    struct ocfs2_extent_tree *et)
+{
+        et->et_max_leaf_clusters =
+                ocfs2_clusters_for_bytes(inode->i_sb,
+                                         OCFS2_MAX_XATTR_TREE_LEAF_SIZE);
+}
+
+static void ocfs2_xattr_tree_set_last_eb_blk(struct ocfs2_extent_tree *et,
+                                             u64 blkno)
+{
+        struct ocfs2_xattr_block *xb = et->et_object;
+        struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
+
+        xt->xt_last_eb_blk = cpu_to_le64(blkno);
+}
+
+static u64 ocfs2_xattr_tree_get_last_eb_blk(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_xattr_block *xb = et->et_object;
+        struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
+
+        return le64_to_cpu(xt->xt_last_eb_blk);
+}
+
+static void ocfs2_xattr_tree_update_clusters(struct inode *inode,
+                                             struct ocfs2_extent_tree *et,
+                                             u32 clusters)
+{
+        struct ocfs2_xattr_block *xb = et->et_object;
+
+        le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, clusters);
+}
+
+static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
+        .eo_set_last_eb_blk     = ocfs2_xattr_tree_set_last_eb_blk,
+        .eo_get_last_eb_blk     = ocfs2_xattr_tree_get_last_eb_blk,
+        .eo_update_clusters     = ocfs2_xattr_tree_update_clusters,
+        .eo_fill_root_el        = ocfs2_xattr_tree_fill_root_el,
+        .eo_fill_max_leaf_clusters = ocfs2_xattr_tree_fill_max_leaf_clusters,
+};
+
+static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et,
+                                     struct inode *inode,
+                                     struct buffer_head *bh,
+                                     void *obj,
+                                     struct ocfs2_extent_tree_operations *ops)
+{
+        et->et_ops = ops;
+        et->et_root_bh = bh;
+        if (!obj)
+                obj = (void *)bh->b_data;
+        et->et_object = obj;
+
+        et->et_ops->eo_fill_root_el(et);
+        if (!et->et_ops->eo_fill_max_leaf_clusters)
+                et->et_max_leaf_clusters = 0;
+        else
+                et->et_ops->eo_fill_max_leaf_clusters(inode, et);
+}
+
+void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
+                                   struct inode *inode,
+                                   struct buffer_head *bh)
+{
+        __ocfs2_init_extent_tree(et, inode, bh, NULL, &ocfs2_dinode_et_ops);
+}
+
+void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
+                                       struct inode *inode,
+                                       struct buffer_head *bh)
+{
+        __ocfs2_init_extent_tree(et, inode, bh, NULL,
+                                 &ocfs2_xattr_tree_et_ops);
+}
+
+void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
+                                        struct inode *inode,
+                                        struct buffer_head *bh,
+                                        struct ocfs2_xattr_value_root *xv)
+{
+        __ocfs2_init_extent_tree(et, inode, bh, xv,
+                                 &ocfs2_xattr_value_et_ops);
+}
+
+static inline void ocfs2_et_set_last_eb_blk(struct ocfs2_extent_tree *et,
+                                            u64 new_last_eb_blk)
+{
+        et->et_ops->eo_set_last_eb_blk(et, new_last_eb_blk);
+}
+
+static inline u64 ocfs2_et_get_last_eb_blk(struct ocfs2_extent_tree *et)
+{
+        return et->et_ops->eo_get_last_eb_blk(et);
+}
+
+static inline void ocfs2_et_update_clusters(struct inode *inode,
+                                            struct ocfs2_extent_tree *et,
+                                            u32 clusters)
+{
+        et->et_ops->eo_update_clusters(inode, et, clusters);
+}
+
+static inline int ocfs2_et_insert_check(struct inode *inode,
+                                        struct ocfs2_extent_tree *et,
+                                        struct ocfs2_extent_rec *rec)
+{
+        int ret = 0;
+
+        if (et->et_ops->eo_insert_check)
+                ret = et->et_ops->eo_insert_check(inode, et, rec);
+        return ret;
+}
+
+static inline int ocfs2_et_sanity_check(struct inode *inode,
+                                        struct ocfs2_extent_tree *et)
+{
+        int ret = 0;
+
+        if (et->et_ops->eo_sanity_check)
+                ret = et->et_ops->eo_sanity_check(inode, et);
+        return ret;
+}
+
 static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc);
 static int ocfs2_cache_extent_block_free(struct ocfs2_cached_dealloc_ctxt *ctxt,
                                          struct ocfs2_extent_block *eb);
@@ -205,17 +539,6 @@ static struct ocfs2_path *ocfs2_new_path(struct buffer_head *root_bh,
 }
 
 /*
- * Allocate and initialize a new path based on a disk inode tree.
- */
-static struct ocfs2_path *ocfs2_new_inode_path(struct buffer_head *di_bh)
-{
-        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
-        struct ocfs2_extent_list *el = &di->id2.i_list;
-
-        return ocfs2_new_path(di_bh, el);
-}
-
-/*
  * Convenience function to journal all components in a path.
  */
 static int ocfs2_journal_access_path(struct inode *inode, handle_t *handle,
@@ -368,39 +691,35 @@ struct ocfs2_merge_ctxt {
  */
 int ocfs2_num_free_extents(struct ocfs2_super *osb,
                            struct inode *inode,
-                           struct ocfs2_dinode *fe)
+                           struct ocfs2_extent_tree *et)
 {
         int retval;
-        struct ocfs2_extent_list *el;
+        struct ocfs2_extent_list *el = NULL;
         struct ocfs2_extent_block *eb;
         struct buffer_head *eb_bh = NULL;
+        u64 last_eb_blk = 0;
 
         mlog_entry_void();
 
-        if (!OCFS2_IS_VALID_DINODE(fe)) {
-                OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
-                retval = -EIO;
-                goto bail;
-        }
+        el = et->et_root_el;
+        last_eb_blk = ocfs2_et_get_last_eb_blk(et);
 
-        if (fe->i_last_eb_blk) {
-                retval = ocfs2_read_block(osb, le64_to_cpu(fe->i_last_eb_blk),
-                                          &eb_bh, OCFS2_BH_CACHED, inode);
+        if (last_eb_blk) {
+                retval = ocfs2_read_block(inode, last_eb_blk,
+                                          &eb_bh);
                 if (retval < 0) {
                         mlog_errno(retval);
                         goto bail;
                 }
                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
                 el = &eb->h_list;
-        } else
-                el = &fe->id2.i_list;
+        }
 
         BUG_ON(el->l_tree_depth != 0);
 
         retval = le16_to_cpu(el->l_count) - le16_to_cpu(el->l_next_free_rec);
 bail:
-        if (eb_bh)
-                brelse(eb_bh);
+        brelse(eb_bh);
 
         mlog_exit(retval);
         return retval;
@@ -486,8 +805,7 @@ static int ocfs2_create_new_meta_bhs(struct ocfs2_super *osb,
 bail:
         if (status < 0) {
                 for(i = 0; i < wanted; i++) {
-                        if (bhs[i])
-                                brelse(bhs[i]);
+                        brelse(bhs[i]);
                         bhs[i] = NULL;
                 }
         }
@@ -531,7 +849,7 @@ static inline u32 ocfs2_sum_rightmost_rec(struct ocfs2_extent_list  *el)
 static int ocfs2_add_branch(struct ocfs2_super *osb,
                             handle_t *handle,
                             struct inode *inode,
-                            struct buffer_head *fe_bh,
+                            struct ocfs2_extent_tree *et,
                             struct buffer_head *eb_bh,
                             struct buffer_head **last_eb_bh,
                             struct ocfs2_alloc_context *meta_ac)
@@ -540,7 +858,6 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
         u64 next_blkno, new_last_eb_blk;
         struct buffer_head *bh;
         struct buffer_head **new_eb_bhs = NULL;
-        struct ocfs2_dinode *fe;
         struct ocfs2_extent_block *eb;
         struct ocfs2_extent_list  *eb_el;
         struct ocfs2_extent_list  *el;
@@ -550,13 +867,11 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
 
         BUG_ON(!last_eb_bh || !*last_eb_bh);
 
-        fe = (struct ocfs2_dinode *) fe_bh->b_data;
-
         if (eb_bh) {
                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
                 el = &eb->h_list;
         } else
-                el = &fe->id2.i_list;
+                el = et->et_root_el;
 
         /* we never add a branch to a leaf. */
         BUG_ON(!el->l_tree_depth);
@@ -646,7 +961,7 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
                 mlog_errno(status);
                 goto bail;
         }
-        status = ocfs2_journal_access(handle, inode, fe_bh,
+        status = ocfs2_journal_access(handle, inode, et->et_root_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -662,7 +977,7 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
         }
 
         /* Link the new branch into the rest of the tree (el will
-         * either be on the fe, or the extent block passed in. */
+         * either be on the root_bh, or the extent block passed in. */
         i = le16_to_cpu(el->l_next_free_rec);
         el->l_recs[i].e_blkno = cpu_to_le64(next_blkno);
         el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
@@ -671,7 +986,7 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
 
         /* fe needs a new last extent block pointer, as does the
          * next_leaf on the previously last-extent-block. */
-        fe->i_last_eb_blk = cpu_to_le64(new_last_eb_blk);
+        ocfs2_et_set_last_eb_blk(et, new_last_eb_blk);
 
         eb = (struct ocfs2_extent_block *) (*last_eb_bh)->b_data;
         eb->h_next_leaf_blk = cpu_to_le64(new_last_eb_blk);
@@ -679,7 +994,7 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
         status = ocfs2_journal_dirty(handle, *last_eb_bh);
         if (status < 0)
                 mlog_errno(status);
-        status = ocfs2_journal_dirty(handle, fe_bh);
+        status = ocfs2_journal_dirty(handle, et->et_root_bh);
         if (status < 0)
                 mlog_errno(status);
         if (eb_bh) {
@@ -700,8 +1015,7 @@ static int ocfs2_add_branch(struct ocfs2_super *osb,
 bail:
         if (new_eb_bhs) {
                 for (i = 0; i < new_blocks; i++)
-                        if (new_eb_bhs[i])
-                                brelse(new_eb_bhs[i]);
+                        brelse(new_eb_bhs[i]);
                 kfree(new_eb_bhs);
         }
 
@@ -717,16 +1031,15 @@ bail:
 static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
                                   handle_t *handle,
                                   struct inode *inode,
-                                  struct buffer_head *fe_bh,
+                                  struct ocfs2_extent_tree *et,
                                   struct ocfs2_alloc_context *meta_ac,
                                   struct buffer_head **ret_new_eb_bh)
 {
         int status, i;
         u32 new_clusters;
         struct buffer_head *new_eb_bh = NULL;
-        struct ocfs2_dinode *fe;
         struct ocfs2_extent_block *eb;
-        struct ocfs2_extent_list  *fe_el;
+        struct ocfs2_extent_list  *root_el;
         struct ocfs2_extent_list  *eb_el;
 
         mlog_entry_void();
@@ -746,8 +1059,7 @@ static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
         }
 
         eb_el = &eb->h_list;
-        fe = (struct ocfs2_dinode *) fe_bh->b_data;
-        fe_el = &fe->id2.i_list;
+        root_el = et->et_root_el;
 
         status = ocfs2_journal_access(handle, inode, new_eb_bh,
                                       OCFS2_JOURNAL_ACCESS_CREATE);
@@ -756,11 +1068,11 @@ static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
                 goto bail;
         }
 
-        /* copy the fe data into the new extent block */
-        eb_el->l_tree_depth = fe_el->l_tree_depth;
-        eb_el->l_next_free_rec = fe_el->l_next_free_rec;
-        for(i = 0; i < le16_to_cpu(fe_el->l_next_free_rec); i++)
-                eb_el->l_recs[i] = fe_el->l_recs[i];
+        /* copy the root extent list data into the new extent block */
+        eb_el->l_tree_depth = root_el->l_tree_depth;
+        eb_el->l_next_free_rec = root_el->l_next_free_rec;
+        for (i = 0; i < le16_to_cpu(root_el->l_next_free_rec); i++)
+                eb_el->l_recs[i] = root_el->l_recs[i];
 
         status = ocfs2_journal_dirty(handle, new_eb_bh);
         if (status < 0) {
@@ -768,7 +1080,7 @@ static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
                 goto bail;
         }
 
-        status = ocfs2_journal_access(handle, inode, fe_bh,
+        status = ocfs2_journal_access(handle, inode, et->et_root_bh,
                                       OCFS2_JOURNAL_ACCESS_WRITE);
         if (status < 0) {
                 mlog_errno(status);
@@ -777,21 +1089,21 @@ static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
 
         new_clusters = ocfs2_sum_rightmost_rec(eb_el);
 
-        /* update fe now */
-        le16_add_cpu(&fe_el->l_tree_depth, 1);
-        fe_el->l_recs[0].e_cpos = 0;
-        fe_el->l_recs[0].e_blkno = eb->h_blkno;
-        fe_el->l_recs[0].e_int_clusters = cpu_to_le32(new_clusters);
-        for(i = 1; i < le16_to_cpu(fe_el->l_next_free_rec); i++)
-                memset(&fe_el->l_recs[i], 0, sizeof(struct ocfs2_extent_rec));
-        fe_el->l_next_free_rec = cpu_to_le16(1);
+        /* update root_bh now */
+        le16_add_cpu(&root_el->l_tree_depth, 1);
+        root_el->l_recs[0].e_cpos = 0;
+        root_el->l_recs[0].e_blkno = eb->h_blkno;
+        root_el->l_recs[0].e_int_clusters = cpu_to_le32(new_clusters);
+        for (i = 1; i < le16_to_cpu(root_el->l_next_free_rec); i++)
+                memset(&root_el->l_recs[i], 0, sizeof(struct ocfs2_extent_rec));
+        root_el->l_next_free_rec = cpu_to_le16(1);
 
         /* If this is our 1st tree depth shift, then last_eb_blk
          * becomes the allocated extent block */
-        if (fe_el->l_tree_depth == cpu_to_le16(1))
-                fe->i_last_eb_blk = eb->h_blkno;
+        if (root_el->l_tree_depth == cpu_to_le16(1))
+                ocfs2_et_set_last_eb_blk(et, le64_to_cpu(eb->h_blkno));
 
-        status = ocfs2_journal_dirty(handle, fe_bh);
+        status = ocfs2_journal_dirty(handle, et->et_root_bh);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -801,8 +1113,7 @@ static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
         new_eb_bh = NULL;
         status = 0;
 bail:
-        if (new_eb_bh)
-                brelse(new_eb_bh);
+        brelse(new_eb_bh);
 
         mlog_exit(status);
         return status;
@@ -817,22 +1128,21 @@ bail:
  * 1) a lowest extent block is found, then we pass it back in
  *    *lowest_eb_bh and return '0'
  *
- * 2) the search fails to find anything, but the dinode has room. We
+ * 2) the search fails to find anything, but the root_el has room. We
  *    pass NULL back in *lowest_eb_bh, but still return '0'
  *
- * 3) the search fails to find anything AND the dinode is full, in
+ * 3) the search fails to find anything AND the root_el is full, in
  *    which case we return > 0
  *
  * return status < 0 indicates an error.
  */
 static int ocfs2_find_branch_target(struct ocfs2_super *osb,
                                     struct inode *inode,
-                                    struct buffer_head *fe_bh,
+                                    struct ocfs2_extent_tree *et,
                                     struct buffer_head **target_bh)
 {
         int status = 0, i;
         u64 blkno;
-        struct ocfs2_dinode *fe;
         struct ocfs2_extent_block *eb;
         struct ocfs2_extent_list  *el;
         struct buffer_head *bh = NULL;
@@ -842,8 +1152,7 @@ static int ocfs2_find_branch_target(struct ocfs2_super *osb,
 
         *target_bh = NULL;
 
-        fe = (struct ocfs2_dinode *) fe_bh->b_data;
-        el = &fe->id2.i_list;
+        el = et->et_root_el;
 
         while(le16_to_cpu(el->l_tree_depth) > 1) {
                 if (le16_to_cpu(el->l_next_free_rec) == 0) {
@@ -864,13 +1173,10 @@ static int ocfs2_find_branch_target(struct ocfs2_super *osb,
                         goto bail;
                 }
 
-                if (bh) {
-                        brelse(bh);
-                        bh = NULL;
-                }
+                brelse(bh);
+                bh = NULL;
 
-                status = ocfs2_read_block(osb, blkno, &bh, OCFS2_BH_CACHED,
-                                          inode);
+                status = ocfs2_read_block(inode, blkno, &bh);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
@@ -886,8 +1192,7 @@ static int ocfs2_find_branch_target(struct ocfs2_super *osb,
 
                 if (le16_to_cpu(el->l_next_free_rec) <
                     le16_to_cpu(el->l_count)) {
-                        if (lowest_bh)
-                                brelse(lowest_bh);
+                        brelse(lowest_bh);
                         lowest_bh = bh;
                         get_bh(lowest_bh);
                 }
@@ -895,14 +1200,13 @@ static int ocfs2_find_branch_target(struct ocfs2_super *osb,
 
         /* If we didn't find one and the fe doesn't have any room,
          * then return '1' */
-        if (!lowest_bh
-            && (fe->id2.i_list.l_next_free_rec == fe->id2.i_list.l_count))
+        el = et->et_root_el;
+        if (!lowest_bh && (el->l_next_free_rec == el->l_count))
                 status = 1;
 
         *target_bh = lowest_bh;
 bail:
-        if (bh)
-                brelse(bh);
+        brelse(bh);
 
         mlog_exit(status);
         return status;
@@ -919,19 +1223,19 @@ bail:
  * *last_eb_bh will be updated by ocfs2_add_branch().
  */
 static int ocfs2_grow_tree(struct inode *inode, handle_t *handle,
-                           struct buffer_head *di_bh, int *final_depth,
+                           struct ocfs2_extent_tree *et, int *final_depth,
                            struct buffer_head **last_eb_bh,
                            struct ocfs2_alloc_context *meta_ac)
 {
         int ret, shift;
-        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
-        int depth = le16_to_cpu(di->id2.i_list.l_tree_depth);
+        struct ocfs2_extent_list *el = et->et_root_el;
+        int depth = le16_to_cpu(el->l_tree_depth);
         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
         struct buffer_head *bh = NULL;
 
         BUG_ON(meta_ac == NULL);
 
-        shift = ocfs2_find_branch_target(osb, inode, di_bh, &bh);
+        shift = ocfs2_find_branch_target(osb, inode, et, &bh);
         if (shift < 0) {
                 ret = shift;
                 mlog_errno(ret);
@@ -948,7 +1252,7 @@ static int ocfs2_grow_tree(struct inode *inode, handle_t *handle,
                 /* ocfs2_shift_tree_depth will return us a buffer with
                  * the new extent block (so we can pass that to
                  * ocfs2_add_branch). */
-                ret = ocfs2_shift_tree_depth(osb, handle, inode, di_bh,
+                ret = ocfs2_shift_tree_depth(osb, handle, inode, et,
                                              meta_ac, &bh);
                 if (ret < 0) {
                         mlog_errno(ret);
@@ -975,7 +1279,7 @@ static int ocfs2_grow_tree(struct inode *inode, handle_t *handle,
         /* call ocfs2_add_branch to add the final part of the tree with
          * the new data. */
         mlog(0, "add branch. bh = %p\n", bh);
-        ret = ocfs2_add_branch(osb, handle, inode, di_bh, bh, last_eb_bh,
+        ret = ocfs2_add_branch(osb, handle, inode, et, bh, last_eb_bh,
                                meta_ac);
         if (ret < 0) {
                 mlog_errno(ret);
@@ -1236,8 +1540,7 @@ static int __ocfs2_find_path(struct inode *inode,
 
                 brelse(bh);
                 bh = NULL;
-                ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), blkno,
-                                       &bh, OCFS2_BH_CACHED, inode);
+                ret = ocfs2_read_block(inode, blkno, &bh);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -2058,11 +2361,11 @@ static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
                                      struct ocfs2_path *right_path,
                                      int subtree_index,
                                      struct ocfs2_cached_dealloc_ctxt *dealloc,
-                                     int *deleted)
+                                     int *deleted,
+                                     struct ocfs2_extent_tree *et)
 {
         int ret, i, del_right_subtree = 0, right_has_empty = 0;
-        struct buffer_head *root_bh, *di_bh = path_root_bh(right_path);
-        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        struct buffer_head *root_bh, *et_root_bh = path_root_bh(right_path);
         struct ocfs2_extent_list *right_leaf_el, *left_leaf_el;
         struct ocfs2_extent_block *eb;
 
@@ -2114,7 +2417,7 @@ static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
                  * We have to update i_last_eb_blk during the meta
                  * data delete.
                  */
-                ret = ocfs2_journal_access(handle, inode, di_bh,
+                ret = ocfs2_journal_access(handle, inode, et_root_bh,
                                            OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret) {
                         mlog_errno(ret);
@@ -2189,7 +2492,7 @@ static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
                 ocfs2_update_edge_lengths(inode, handle, left_path);
 
                 eb = (struct ocfs2_extent_block *)path_leaf_bh(left_path)->b_data;
-                di->i_last_eb_blk = eb->h_blkno;
+                ocfs2_et_set_last_eb_blk(et, le64_to_cpu(eb->h_blkno));
 
                 /*
                  * Removal of the extent in the left leaf was skipped
@@ -2199,7 +2502,7 @@ static int ocfs2_rotate_subtree_left(struct inode *inode, handle_t *handle,
                 if (right_has_empty)
                         ocfs2_remove_empty_extent(left_leaf_el);
 
-                ret = ocfs2_journal_dirty(handle, di_bh);
+                ret = ocfs2_journal_dirty(handle, et_root_bh);
                 if (ret)
                         mlog_errno(ret);
 
@@ -2322,7 +2625,8 @@ static int __ocfs2_rotate_tree_left(struct inode *inode,
                                     handle_t *handle, int orig_credits,
                                     struct ocfs2_path *path,
                                     struct ocfs2_cached_dealloc_ctxt *dealloc,
-                                    struct ocfs2_path **empty_extent_path)
+                                    struct ocfs2_path **empty_extent_path,
+                                    struct ocfs2_extent_tree *et)
 {
         int ret, subtree_root, deleted;
         u32 right_cpos;
@@ -2395,7 +2699,7 @@ static int __ocfs2_rotate_tree_left(struct inode *inode,
 
                 ret = ocfs2_rotate_subtree_left(inode, handle, left_path,
                                                 right_path, subtree_root,
-                                                dealloc, &deleted);
+                                                dealloc, &deleted, et);
                 if (ret == -EAGAIN) {
                         /*
                          * The rotation has to temporarily stop due to
@@ -2438,29 +2742,20 @@ out:
 }
 
 static int ocfs2_remove_rightmost_path(struct inode *inode, handle_t *handle,
-                                       struct ocfs2_path *path,
-                                       struct ocfs2_cached_dealloc_ctxt *dealloc)
+                                struct ocfs2_path *path,
+                                struct ocfs2_cached_dealloc_ctxt *dealloc,
+                                struct ocfs2_extent_tree *et)
 {
         int ret, subtree_index;
         u32 cpos;
         struct ocfs2_path *left_path = NULL;
-        struct ocfs2_dinode *di;
         struct ocfs2_extent_block *eb;
         struct ocfs2_extent_list *el;
 
-        /*
-         * XXX: This code assumes that the root is an inode, which is
-         * true for now but may change as tree code gets generic.
-         */
-        di = (struct ocfs2_dinode *)path_root_bh(path)->b_data;
-        if (!OCFS2_IS_VALID_DINODE(di)) {
-                ret = -EIO;
-                ocfs2_error(inode->i_sb,
-                            "Inode %llu has invalid path root",
-                            (unsigned long long)OCFS2_I(inode)->ip_blkno);
-                goto out;
-        }
 
+        ret = ocfs2_et_sanity_check(inode, et);
+        if (ret)
+                goto out;
         /*
          * There's two ways we handle this depending on
          * whether path is the only existing one.
@@ -2517,7 +2812,7 @@ static int ocfs2_remove_rightmost_path(struct inode *inode, handle_t *handle,
                 ocfs2_update_edge_lengths(inode, handle, left_path);
 
                 eb = (struct ocfs2_extent_block *)path_leaf_bh(left_path)->b_data;
-                di->i_last_eb_blk = eb->h_blkno;
+                ocfs2_et_set_last_eb_blk(et, le64_to_cpu(eb->h_blkno));
         } else {
                 /*
                  * 'path' is also the leftmost path which
@@ -2528,12 +2823,12 @@ static int ocfs2_remove_rightmost_path(struct inode *inode, handle_t *handle,
                  */
                 ocfs2_unlink_path(inode, handle, dealloc, path, 1);
 
-                el = &di->id2.i_list;
+                el = et->et_root_el;
                 el->l_tree_depth = 0;
                 el->l_next_free_rec = 0;
                 memset(&el->l_recs[0], 0, sizeof(struct ocfs2_extent_rec));
 
-                di->i_last_eb_blk = 0;
+                ocfs2_et_set_last_eb_blk(et, 0);
         }
 
         ocfs2_journal_dirty(handle, path_root_bh(path));
@@ -2561,7 +2856,8 @@ out:
  */
 static int ocfs2_rotate_tree_left(struct inode *inode, handle_t *handle,
                                   struct ocfs2_path *path,
-                                  struct ocfs2_cached_dealloc_ctxt *dealloc)
+                                  struct ocfs2_cached_dealloc_ctxt *dealloc,
+                                  struct ocfs2_extent_tree *et)
 {
         int ret, orig_credits = handle->h_buffer_credits;
         struct ocfs2_path *tmp_path = NULL, *restart_path = NULL;
@@ -2575,7 +2871,7 @@ static int ocfs2_rotate_tree_left(struct inode *inode, handle_t *handle,
         if (path->p_tree_depth == 0) {
 rightmost_no_delete:
                 /*
-                 * In-inode extents. This is trivially handled, so do
+                 * Inline extents. This is trivially handled, so do
                  * it up front.
                  */
                 ret = ocfs2_rotate_rightmost_leaf_left(inode, handle,
@@ -2629,7 +2925,7 @@ rightmost_no_delete:
                  */
 
                 ret = ocfs2_remove_rightmost_path(inode, handle, path,
-                                                  dealloc);
+                                                  dealloc, et);
                 if (ret)
                         mlog_errno(ret);
                 goto out;
@@ -2641,7 +2937,7 @@ rightmost_no_delete:
          */
 try_rotate:
         ret = __ocfs2_rotate_tree_left(inode, handle, orig_credits, path,
-                                       dealloc, &restart_path);
+                                       dealloc, &restart_path, et);
         if (ret && ret != -EAGAIN) {
                 mlog_errno(ret);
                 goto out;
@@ -2653,7 +2949,7 @@ try_rotate:
 
                 ret = __ocfs2_rotate_tree_left(inode, handle, orig_credits,
                                                tmp_path, dealloc,
-                                               &restart_path);
+                                               &restart_path, et);
                 if (ret && ret != -EAGAIN) {
                         mlog_errno(ret);
                         goto out;
@@ -2939,6 +3235,7 @@ static int ocfs2_merge_rec_left(struct inode *inode,
                                 handle_t *handle,
                                 struct ocfs2_extent_rec *split_rec,
                                 struct ocfs2_cached_dealloc_ctxt *dealloc,
+                                struct ocfs2_extent_tree *et,
                                 int index)
 {
         int ret, i, subtree_index = 0, has_empty_extent = 0;
@@ -3059,7 +3356,8 @@ static int ocfs2_merge_rec_left(struct inode *inode,
                     le16_to_cpu(el->l_next_free_rec) == 1) {
 
                         ret = ocfs2_remove_rightmost_path(inode, handle,
-                                                          right_path, dealloc);
+                                                          right_path,
+                                                          dealloc, et);
                         if (ret) {
                                 mlog_errno(ret);
                                 goto out;
@@ -3086,7 +3384,8 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                                      int split_index,
                                      struct ocfs2_extent_rec *split_rec,
                                      struct ocfs2_cached_dealloc_ctxt *dealloc,
-                                     struct ocfs2_merge_ctxt *ctxt)
+                                     struct ocfs2_merge_ctxt *ctxt,
+                                     struct ocfs2_extent_tree *et)
 
 {
         int ret = 0;
@@ -3104,7 +3403,7 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                  * illegal.
                  */
                 ret = ocfs2_rotate_tree_left(inode, handle, path,
-                                             dealloc);
+                                             dealloc, et);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -3147,7 +3446,8 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                 BUG_ON(!ocfs2_is_empty_extent(&el->l_recs[0]));
 
                 /* The merge left us with an empty extent, remove it. */
-                ret = ocfs2_rotate_tree_left(inode, handle, path, dealloc);
+                ret = ocfs2_rotate_tree_left(inode, handle, path,
+                                             dealloc, et);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -3161,7 +3461,7 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                  */
                 ret = ocfs2_merge_rec_left(inode, path,
                                            handle, rec,
-                                           dealloc,
+                                           dealloc, et,
                                            split_index);
 
                 if (ret) {
@@ -3170,7 +3470,7 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                 }
 
                 ret = ocfs2_rotate_tree_left(inode, handle, path,
-                                             dealloc);
+                                             dealloc, et);
                 /*
                  * Error from this last rotate is not critical, so
                  * print but don't bubble it up.
@@ -3190,7 +3490,7 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                         ret = ocfs2_merge_rec_left(inode,
                                                    path,
                                                    handle, split_rec,
-                                                   dealloc,
+                                                   dealloc, et,
                                                    split_index);
                         if (ret) {
                                 mlog_errno(ret);
@@ -3213,7 +3513,7 @@ static int ocfs2_try_to_merge_extent(struct inode *inode,
                          * our leaf. Try to rotate it away.
                          */
                         ret = ocfs2_rotate_tree_left(inode, handle, path,
-                                                     dealloc);
+                                                     dealloc, et);
                         if (ret)
                                 mlog_errno(ret);
                         ret = 0;
@@ -3347,16 +3647,6 @@ rotate:
         ocfs2_rotate_leaf(el, insert_rec);
 }
 
-static inline void ocfs2_update_dinode_clusters(struct inode *inode,
-                                                struct ocfs2_dinode *di,
-                                                u32 clusters)
-{
-        le32_add_cpu(&di->i_clusters, clusters);
-        spin_lock(&OCFS2_I(inode)->ip_lock);
-        OCFS2_I(inode)->ip_clusters = le32_to_cpu(di->i_clusters);
-        spin_unlock(&OCFS2_I(inode)->ip_lock);
-}
-
 static void ocfs2_adjust_rightmost_records(struct inode *inode,
                                            handle_t *handle,
                                            struct ocfs2_path *path,
@@ -3558,8 +3848,8 @@ static void ocfs2_split_record(struct inode *inode,
 }
 
 /*
- * This function only does inserts on an allocation b-tree. For dinode
- * lists, ocfs2_insert_at_leaf() is called directly.
+ * This function only does inserts on an allocation b-tree. For tree
+ * depth = 0, ocfs2_insert_at_leaf() is called directly.
  *
  * right_path is the path we want to do the actual insert
  * in. left_path should only be passed in if we need to update that
@@ -3656,7 +3946,7 @@ out:
 
 static int ocfs2_do_insert_extent(struct inode *inode,
                                   handle_t *handle,
-                                  struct buffer_head *di_bh,
+                                  struct ocfs2_extent_tree *et,
                                   struct ocfs2_extent_rec *insert_rec,
                                   struct ocfs2_insert_type *type)
 {
@@ -3664,13 +3954,11 @@ static int ocfs2_do_insert_extent(struct inode *inode,
         u32 cpos;
         struct ocfs2_path *right_path = NULL;
         struct ocfs2_path *left_path = NULL;
-        struct ocfs2_dinode *di;
         struct ocfs2_extent_list *el;
 
-        di = (struct ocfs2_dinode *) di_bh->b_data;
-        el = &di->id2.i_list;
+        el = et->et_root_el;
 
-        ret = ocfs2_journal_access(handle, inode, di_bh,
+        ret = ocfs2_journal_access(handle, inode, et->et_root_bh,
                                    OCFS2_JOURNAL_ACCESS_WRITE);
         if (ret) {
                 mlog_errno(ret);
@@ -3682,7 +3970,7 @@ static int ocfs2_do_insert_extent(struct inode *inode,
                 goto out_update_clusters;
         }
 
-        right_path = ocfs2_new_inode_path(di_bh);
+        right_path = ocfs2_new_path(et->et_root_bh, et->et_root_el);
         if (!right_path) {
                 ret = -ENOMEM;
                 mlog_errno(ret);
@@ -3732,7 +4020,7 @@ static int ocfs2_do_insert_extent(struct inode *inode,
                  * ocfs2_rotate_tree_right() might have extended the
                  * transaction without re-journaling our tree root.
                  */
-                ret = ocfs2_journal_access(handle, inode, di_bh,
+                ret = ocfs2_journal_access(handle, inode, et->et_root_bh,
                                            OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret) {
                         mlog_errno(ret);
@@ -3757,10 +4045,10 @@ static int ocfs2_do_insert_extent(struct inode *inode,
 
 out_update_clusters:
         if (type->ins_split == SPLIT_NONE)
-                ocfs2_update_dinode_clusters(inode, di,
-                                             le16_to_cpu(insert_rec->e_leaf_clusters));
+                ocfs2_et_update_clusters(inode, et,
+                                         le16_to_cpu(insert_rec->e_leaf_clusters));
 
-        ret = ocfs2_journal_dirty(handle, di_bh);
+        ret = ocfs2_journal_dirty(handle, et->et_root_bh);
         if (ret)
                 mlog_errno(ret);
 
@@ -3890,7 +4178,8 @@ out:
 static void ocfs2_figure_contig_type(struct inode *inode,
                                      struct ocfs2_insert_type *insert,
                                      struct ocfs2_extent_list *el,
-                                     struct ocfs2_extent_rec *insert_rec)
+                                     struct ocfs2_extent_rec *insert_rec,
+                                     struct ocfs2_extent_tree *et)
 {
         int i;
         enum ocfs2_contig_type contig_type = CONTIG_NONE;
@@ -3906,6 +4195,21 @@ static void ocfs2_figure_contig_type(struct inode *inode,
                 }
         }
         insert->ins_contig = contig_type;
+
+        if (insert->ins_contig != CONTIG_NONE) {
+                struct ocfs2_extent_rec *rec =
+                                &el->l_recs[insert->ins_contig_index];
+                unsigned int len = le16_to_cpu(rec->e_leaf_clusters) +
+                                   le16_to_cpu(insert_rec->e_leaf_clusters);
+
+                /*
+                 * Caller might want us to limit the size of extents, don't
+                 * calculate contiguousness if we might exceed that limit.
+                 */
+                if (et->et_max_leaf_clusters &&
+                    (len > et->et_max_leaf_clusters))
+                        insert->ins_contig = CONTIG_NONE;
+        }
 }
 
 /*
@@ -3914,8 +4218,8 @@ static void ocfs2_figure_contig_type(struct inode *inode,
  * ocfs2_figure_appending_type() will figure out whether we'll have to
  * insert at the tail of the rightmost leaf.
  *
- * This should also work against the dinode list for tree's with 0
- * depth. If we consider the dinode list to be the rightmost leaf node
+ * This should also work against the root extent list for tree's with 0
+ * depth. If we consider the root extent list to be the rightmost leaf node
  * then the logic here makes sense.
  */
 static void ocfs2_figure_appending_type(struct ocfs2_insert_type *insert,
@@ -3966,14 +4270,13 @@ set_tail_append:
  * structure.
  */
 static int ocfs2_figure_insert_type(struct inode *inode,
-                                    struct buffer_head *di_bh,
+                                    struct ocfs2_extent_tree *et,
                                     struct buffer_head **last_eb_bh,
                                     struct ocfs2_extent_rec *insert_rec,
                                     int *free_records,
                                     struct ocfs2_insert_type *insert)
 {
         int ret;
-        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
         struct ocfs2_extent_block *eb;
         struct ocfs2_extent_list *el;
         struct ocfs2_path *path = NULL;
@@ -3981,7 +4284,7 @@ static int ocfs2_figure_insert_type(struct inode *inode,
 
         insert->ins_split = SPLIT_NONE;
 
-        el = &di->id2.i_list;
+        el = et->et_root_el;
         insert->ins_tree_depth = le16_to_cpu(el->l_tree_depth);
 
         if (el->l_tree_depth) {
@@ -3991,9 +4294,7 @@ static int ocfs2_figure_insert_type(struct inode *inode,
                  * ocfs2_figure_insert_type() and ocfs2_add_branch()
                  * may want it later.
                  */
-                ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
-                                       le64_to_cpu(di->i_last_eb_blk), &bh,
-                                       OCFS2_BH_CACHED, inode);
+                ret = ocfs2_read_block(inode, ocfs2_et_get_last_eb_blk(et), &bh);
                 if (ret) {
                         mlog_exit(ret);
                         goto out;
@@ -4014,12 +4315,12 @@ static int ocfs2_figure_insert_type(struct inode *inode,
                 le16_to_cpu(el->l_next_free_rec);
 
         if (!insert->ins_tree_depth) {
-                ocfs2_figure_contig_type(inode, insert, el, insert_rec);
+                ocfs2_figure_contig_type(inode, insert, el, insert_rec, et);
                 ocfs2_figure_appending_type(insert, el, insert_rec);
                 return 0;
         }
 
-        path = ocfs2_new_inode_path(di_bh);
+        path = ocfs2_new_path(et->et_root_bh, et->et_root_el);
         if (!path) {
                 ret = -ENOMEM;
                 mlog_errno(ret);
@@ -4048,7 +4349,7 @@ static int ocfs2_figure_insert_type(struct inode *inode,
          *     into two types of appends: simple record append, or a
          *     rotate inside the tail leaf.
          */
-        ocfs2_figure_contig_type(inode, insert, el, insert_rec);
+        ocfs2_figure_contig_type(inode, insert, el, insert_rec, et);
 
         /*
          * The insert code isn't quite ready to deal with all cases of
@@ -4069,7 +4370,8 @@ static int ocfs2_figure_insert_type(struct inode *inode,
          * the case that we're doing a tail append, so maybe we can
          * take advantage of that information somehow.
          */
-        if (le64_to_cpu(di->i_last_eb_blk) == path_leaf_bh(path)->b_blocknr) {
+        if (ocfs2_et_get_last_eb_blk(et) ==
+            path_leaf_bh(path)->b_blocknr) {
                 /*
                  * Ok, ocfs2_find_path() returned us the rightmost
                  * tree path. This might be an appending insert. There are
@@ -4099,7 +4401,7 @@ out:
 int ocfs2_insert_extent(struct ocfs2_super *osb,
                         handle_t *handle,
                         struct inode *inode,
-                        struct buffer_head *fe_bh,
+                        struct ocfs2_extent_tree *et,
                         u32 cpos,
                         u64 start_blk,
                         u32 new_clusters,
@@ -4112,26 +4414,21 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
         struct ocfs2_insert_type insert = {0, };
         struct ocfs2_extent_rec rec;
 
-        BUG_ON(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL);
-
         mlog(0, "add %u clusters at position %u to inode %llu\n",
              new_clusters, cpos, (unsigned long long)OCFS2_I(inode)->ip_blkno);
 
-        mlog_bug_on_msg(!ocfs2_sparse_alloc(osb) &&
-                        (OCFS2_I(inode)->ip_clusters != cpos),
-                        "Device %s, asking for sparse allocation: inode %llu, "
-                        "cpos %u, clusters %u\n",
-                        osb->dev_str,
-                        (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos,
-                        OCFS2_I(inode)->ip_clusters);
-
         memset(&rec, 0, sizeof(rec));
         rec.e_cpos = cpu_to_le32(cpos);
         rec.e_blkno = cpu_to_le64(start_blk);
         rec.e_leaf_clusters = cpu_to_le16(new_clusters);
         rec.e_flags = flags;
+        status = ocfs2_et_insert_check(inode, et, &rec);
+        if (status) {
+                mlog_errno(status);
+                goto bail;
+        }
 
-        status = ocfs2_figure_insert_type(inode, fe_bh, &last_eb_bh, &rec,
+        status = ocfs2_figure_insert_type(inode, et, &last_eb_bh, &rec,
                                           &free_records, &insert);
         if (status < 0) {
                 mlog_errno(status);
@@ -4145,7 +4442,7 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
              free_records, insert.ins_tree_depth);
 
         if (insert.ins_contig == CONTIG_NONE && free_records == 0) {
-                status = ocfs2_grow_tree(inode, handle, fe_bh,
+                status = ocfs2_grow_tree(inode, handle, et,
                                          &insert.ins_tree_depth, &last_eb_bh,
                                          meta_ac);
                 if (status) {
@@ -4155,17 +4452,124 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
         }
 
         /* Finally, we can add clusters. This might rotate the tree for us. */
-        status = ocfs2_do_insert_extent(inode, handle, fe_bh, &rec, &insert);
+        status = ocfs2_do_insert_extent(inode, handle, et, &rec, &insert);
         if (status < 0)
                 mlog_errno(status);
-        else
+        else if (et->et_ops == &ocfs2_dinode_et_ops)
                 ocfs2_extent_map_insert_rec(inode, &rec);
 
 bail:
-        if (last_eb_bh)
-                brelse(last_eb_bh);
+        brelse(last_eb_bh);
+
+        mlog_exit(status);
+        return status;
+}
+
+/*
+ * Allcate and add clusters into the extent b-tree.
+ * The new clusters(clusters_to_add) will be inserted at logical_offset.
+ * The extent b-tree's root is specified by et, and
+ * it is not limited to the file storage. Any extent tree can use this
+ * function if it implements the proper ocfs2_extent_tree.
+ */
+int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
+                                struct inode *inode,
+                                u32 *logical_offset,
+                                u32 clusters_to_add,
+                                int mark_unwritten,
+                                struct ocfs2_extent_tree *et,
+                                handle_t *handle,
+                                struct ocfs2_alloc_context *data_ac,
+                                struct ocfs2_alloc_context *meta_ac,
+                                enum ocfs2_alloc_restarted *reason_ret)
+{
+        int status = 0;
+        int free_extents;
+        enum ocfs2_alloc_restarted reason = RESTART_NONE;
+        u32 bit_off, num_bits;
+        u64 block;
+        u8 flags = 0;
+
+        BUG_ON(!clusters_to_add);
+
+        if (mark_unwritten)
+                flags = OCFS2_EXT_UNWRITTEN;
+
+        free_extents = ocfs2_num_free_extents(osb, inode, et);
+        if (free_extents < 0) {
+                status = free_extents;
+                mlog_errno(status);
+                goto leave;
+        }
+
+        /* there are two cases which could cause us to EAGAIN in the
+         * we-need-more-metadata case:
+         * 1) we haven't reserved *any*
+         * 2) we are so fragmented, we've needed to add metadata too
+         *    many times. */
+        if (!free_extents && !meta_ac) {
+                mlog(0, "we haven't reserved any metadata!\n");
+                status = -EAGAIN;
+                reason = RESTART_META;
+                goto leave;
+        } else if ((!free_extents)
+                   && (ocfs2_alloc_context_bits_left(meta_ac)
+                       < ocfs2_extend_meta_needed(et->et_root_el))) {
+                mlog(0, "filesystem is really fragmented...\n");
+                status = -EAGAIN;
+                reason = RESTART_META;
+                goto leave;
+        }
+
+        status = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
+                                        clusters_to_add, &bit_off, &num_bits);
+        if (status < 0) {
+                if (status != -ENOSPC)
+                        mlog_errno(status);
+                goto leave;
+        }
+
+        BUG_ON(num_bits > clusters_to_add);
 
+        /* reserve our write early -- insert_extent may update the inode */
+        status = ocfs2_journal_access(handle, inode, et->et_root_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
+        mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
+             num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
+        status = ocfs2_insert_extent(osb, handle, inode, et,
+                                     *logical_offset, block,
+                                     num_bits, flags, meta_ac);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        status = ocfs2_journal_dirty(handle, et->et_root_bh);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        clusters_to_add -= num_bits;
+        *logical_offset += num_bits;
+
+        if (clusters_to_add) {
+                mlog(0, "need to alloc once more, wanted = %u\n",
+                     clusters_to_add);
+                status = -EAGAIN;
+                reason = RESTART_TRANS;
+        }
+
+leave:
         mlog_exit(status);
+        if (reason_ret)
+                *reason_ret = reason;
         return status;
 }
 
@@ -4192,7 +4596,7 @@ static void ocfs2_make_right_split_rec(struct super_block *sb,
 static int ocfs2_split_and_insert(struct inode *inode,
                                   handle_t *handle,
                                   struct ocfs2_path *path,
-                                  struct buffer_head *di_bh,
+                                  struct ocfs2_extent_tree *et,
                                   struct buffer_head **last_eb_bh,
                                   int split_index,
                                   struct ocfs2_extent_rec *orig_split_rec,
@@ -4206,7 +4610,6 @@ static int ocfs2_split_and_insert(struct inode *inode,
         struct ocfs2_extent_rec split_rec = *orig_split_rec;
         struct ocfs2_insert_type insert;
         struct ocfs2_extent_block *eb;
-        struct ocfs2_dinode *di;
 
 leftright:
         /*
@@ -4215,8 +4618,7 @@ leftright:
          */
         rec = path_leaf_el(path)->l_recs[split_index];
 
-        di = (struct ocfs2_dinode *)di_bh->b_data;
-        rightmost_el = &di->id2.i_list;
+        rightmost_el = et->et_root_el;
 
         depth = le16_to_cpu(rightmost_el->l_tree_depth);
         if (depth) {
@@ -4227,8 +4629,8 @@ leftright:
 
         if (le16_to_cpu(rightmost_el->l_next_free_rec) ==
             le16_to_cpu(rightmost_el->l_count)) {
-                ret = ocfs2_grow_tree(inode, handle, di_bh, &depth, last_eb_bh,
-                                      meta_ac);
+                ret = ocfs2_grow_tree(inode, handle, et,
+                                      &depth, last_eb_bh, meta_ac);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -4265,8 +4667,7 @@ leftright:
                 do_leftright = 1;
         }
 
-        ret = ocfs2_do_insert_extent(inode, handle, di_bh, &split_rec,
-                                     &insert);
+        ret = ocfs2_do_insert_extent(inode, handle, et, &split_rec, &insert);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -4308,8 +4709,9 @@ out:
  * of the tree is required. All other cases will degrade into a less
  * optimal tree layout.
  *
- * last_eb_bh should be the rightmost leaf block for any inode with a
- * btree. Since a split may grow the tree or a merge might shrink it, the caller cannot trust the contents of that buffer after this call.
+ * last_eb_bh should be the rightmost leaf block for any extent
+ * btree. Since a split may grow the tree or a merge might shrink it,
+ * the caller cannot trust the contents of that buffer after this call.
  *
  * This code is optimized for readability - several passes might be
  * made over certain portions of the tree. All of those blocks will
@@ -4317,7 +4719,7 @@ out:
  * extra overhead is not expressed in terms of disk reads.
  */
 static int __ocfs2_mark_extent_written(struct inode *inode,
-                                       struct buffer_head *di_bh,
+                                       struct ocfs2_extent_tree *et,
                                        handle_t *handle,
                                        struct ocfs2_path *path,
                                        int split_index,
@@ -4357,11 +4759,9 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
          */
         if (path->p_tree_depth) {
                 struct ocfs2_extent_block *eb;
-                struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
 
-                ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
-                                       le64_to_cpu(di->i_last_eb_blk),
-                                       &last_eb_bh, OCFS2_BH_CACHED, inode);
+                ret = ocfs2_read_block(inode, ocfs2_et_get_last_eb_blk(et),
+                                       &last_eb_bh);
                 if (ret) {
                         mlog_exit(ret);
                         goto out;
@@ -4394,7 +4794,7 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
                 if (ctxt.c_split_covers_rec)
                         el->l_recs[split_index] = *split_rec;
                 else
-                        ret = ocfs2_split_and_insert(inode, handle, path, di_bh,
+                        ret = ocfs2_split_and_insert(inode, handle, path, et,
                                                      &last_eb_bh, split_index,
                                                      split_rec, meta_ac);
                 if (ret)
@@ -4402,7 +4802,7 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
         } else {
                 ret = ocfs2_try_to_merge_extent(inode, handle, path,
                                                 split_index, split_rec,
-                                                dealloc, &ctxt);
+                                                dealloc, &ctxt, et);
                 if (ret)
                         mlog_errno(ret);
         }
@@ -4420,7 +4820,8 @@ out:
  *
  * The caller is responsible for passing down meta_ac if we'll need it.
  */
-int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *di_bh,
+int ocfs2_mark_extent_written(struct inode *inode,
+                              struct ocfs2_extent_tree *et,
                               handle_t *handle, u32 cpos, u32 len, u32 phys,
                               struct ocfs2_alloc_context *meta_ac,
                               struct ocfs2_cached_dealloc_ctxt *dealloc)
@@ -4446,10 +4847,14 @@ int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *di_bh,
         /*
          * XXX: This should be fixed up so that we just re-insert the
          * next extent records.
+         *
+         * XXX: This is a hack on the extent tree, maybe it should be
+         * an op?
          */
-        ocfs2_extent_map_trunc(inode, 0);
+        if (et->et_ops == &ocfs2_dinode_et_ops)
+                ocfs2_extent_map_trunc(inode, 0);
 
-        left_path = ocfs2_new_inode_path(di_bh);
+        left_path = ocfs2_new_path(et->et_root_bh, et->et_root_el);
         if (!left_path) {
                 ret = -ENOMEM;
                 mlog_errno(ret);
@@ -4480,8 +4885,9 @@ int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *di_bh,
         split_rec.e_flags = path_leaf_el(left_path)->l_recs[index].e_flags;
         split_rec.e_flags &= ~OCFS2_EXT_UNWRITTEN;
 
-        ret = __ocfs2_mark_extent_written(inode, di_bh, handle, left_path,
-                                          index, &split_rec, meta_ac, dealloc);
+        ret = __ocfs2_mark_extent_written(inode, et, handle, left_path,
+                                          index, &split_rec, meta_ac,
+                                          dealloc);
         if (ret)
                 mlog_errno(ret);
 
@@ -4490,13 +4896,12 @@ out:
         return ret;
 }
 
-static int ocfs2_split_tree(struct inode *inode, struct buffer_head *di_bh,
+static int ocfs2_split_tree(struct inode *inode, struct ocfs2_extent_tree *et,
                             handle_t *handle, struct ocfs2_path *path,
                             int index, u32 new_range,
                             struct ocfs2_alloc_context *meta_ac)
 {
         int ret, depth, credits = handle->h_buffer_credits;
-        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
         struct buffer_head *last_eb_bh = NULL;
         struct ocfs2_extent_block *eb;
         struct ocfs2_extent_list *rightmost_el, *el;
@@ -4513,9 +4918,8 @@ static int ocfs2_split_tree(struct inode *inode, struct buffer_head *di_bh,
 
         depth = path->p_tree_depth;
         if (depth > 0) {
-                ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
-                                       le64_to_cpu(di->i_last_eb_blk),
-                                       &last_eb_bh, OCFS2_BH_CACHED, inode);
+                ret = ocfs2_read_block(inode, ocfs2_et_get_last_eb_blk(et),
+                                       &last_eb_bh);
                 if (ret < 0) {
                         mlog_errno(ret);
                         goto out;
@@ -4526,7 +4930,8 @@ static int ocfs2_split_tree(struct inode *inode, struct buffer_head *di_bh,
         } else
                 rightmost_el = path_leaf_el(path);
 
-        credits += path->p_tree_depth + ocfs2_extend_meta_needed(di);
+        credits += path->p_tree_depth +
+                   ocfs2_extend_meta_needed(et->et_root_el);
         ret = ocfs2_extend_trans(handle, credits);
         if (ret) {
                 mlog_errno(ret);
@@ -4535,7 +4940,7 @@ static int ocfs2_split_tree(struct inode *inode, struct buffer_head *di_bh,
 
         if (le16_to_cpu(rightmost_el->l_next_free_rec) ==
             le16_to_cpu(rightmost_el->l_count)) {
-                ret = ocfs2_grow_tree(inode, handle, di_bh, &depth, &last_eb_bh,
+                ret = ocfs2_grow_tree(inode, handle, et, &depth, &last_eb_bh,
                                       meta_ac);
                 if (ret) {
                         mlog_errno(ret);
@@ -4549,7 +4954,7 @@ static int ocfs2_split_tree(struct inode *inode, struct buffer_head *di_bh,
         insert.ins_split = SPLIT_RIGHT;
         insert.ins_tree_depth = depth;
 
-        ret = ocfs2_do_insert_extent(inode, handle, di_bh, &split_rec, &insert);
+        ret = ocfs2_do_insert_extent(inode, handle, et, &split_rec, &insert);
         if (ret)
                 mlog_errno(ret);
 
@@ -4561,7 +4966,8 @@ out:
 static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
                               struct ocfs2_path *path, int index,
                               struct ocfs2_cached_dealloc_ctxt *dealloc,
-                              u32 cpos, u32 len)
+                              u32 cpos, u32 len,
+                              struct ocfs2_extent_tree *et)
 {
         int ret;
         u32 left_cpos, rec_range, trunc_range;
@@ -4573,7 +4979,7 @@ static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
         struct ocfs2_extent_block *eb;
 
         if (ocfs2_is_empty_extent(&el->l_recs[0]) && index > 0) {
-                ret = ocfs2_rotate_tree_left(inode, handle, path, dealloc);
+                ret = ocfs2_rotate_tree_left(inode, handle, path, dealloc, et);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -4704,7 +5110,7 @@ static int ocfs2_truncate_rec(struct inode *inode, handle_t *handle,
 
         ocfs2_journal_dirty(handle, path_leaf_bh(path));
 
-        ret = ocfs2_rotate_tree_left(inode, handle, path, dealloc);
+        ret = ocfs2_rotate_tree_left(inode, handle, path, dealloc, et);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -4715,7 +5121,8 @@ out:
         return ret;
 }
 
-int ocfs2_remove_extent(struct inode *inode, struct buffer_head *di_bh,
+int ocfs2_remove_extent(struct inode *inode,
+                        struct ocfs2_extent_tree *et,
                         u32 cpos, u32 len, handle_t *handle,
                         struct ocfs2_alloc_context *meta_ac,
                         struct ocfs2_cached_dealloc_ctxt *dealloc)
@@ -4724,11 +5131,11 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *di_bh,
         u32 rec_range, trunc_range;
         struct ocfs2_extent_rec *rec;
         struct ocfs2_extent_list *el;
-        struct ocfs2_path *path;
+        struct ocfs2_path *path = NULL;
 
         ocfs2_extent_map_trunc(inode, 0);
 
-        path = ocfs2_new_inode_path(di_bh);
+        path = ocfs2_new_path(et->et_root_bh, et->et_root_el);
         if (!path) {
                 ret = -ENOMEM;
                 mlog_errno(ret);
@@ -4781,13 +5188,13 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *di_bh,
 
         if (le32_to_cpu(rec->e_cpos) == cpos || rec_range == trunc_range) {
                 ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc,
-                                         cpos, len);
+                                         cpos, len, et);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
         } else {
-                ret = ocfs2_split_tree(inode, di_bh, handle, path, index,
+                ret = ocfs2_split_tree(inode, et, handle, path, index,
                                        trunc_range, meta_ac);
                 if (ret) {
                         mlog_errno(ret);
@@ -4836,7 +5243,7 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *di_bh,
                 }
 
                 ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc,
-                                         cpos, len);
+                                         cpos, len, et);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -5179,8 +5586,7 @@ static int ocfs2_get_truncate_log_info(struct ocfs2_super *osb,
                 goto bail;
         }
 
-        status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
-                                  OCFS2_BH_CACHED, inode);
+        status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &bh);
         if (status < 0) {
                 iput(inode);
                 mlog_errno(status);
@@ -5255,8 +5661,7 @@ int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
 bail:
         if (tl_inode)
                 iput(tl_inode);
-        if (tl_bh)
-                brelse(tl_bh);
+        brelse(tl_bh);
 
         if (status < 0 && (*tl_copy)) {
                 kfree(*tl_copy);
@@ -5999,20 +6404,13 @@ bail:
         return status;
 }
 
-static int ocfs2_writeback_zero_func(handle_t *handle, struct buffer_head *bh)
+static int ocfs2_zero_func(handle_t *handle, struct buffer_head *bh)
 {
         set_buffer_uptodate(bh);
         mark_buffer_dirty(bh);
         return 0;
 }
 
-static int ocfs2_ordered_zero_func(handle_t *handle, struct buffer_head *bh)
-{
-        set_buffer_uptodate(bh);
-        mark_buffer_dirty(bh);
-        return ocfs2_journal_dirty_data(handle, bh);
-}
-
 static void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
                                      unsigned int from, unsigned int to,
                                      struct page *page, int zero, u64 *phys)
@@ -6031,17 +6429,18 @@ static void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
          * here if they aren't - ocfs2_map_page_blocks()
          * might've skipped some
          */
-        if (ocfs2_should_order_data(inode)) {
-                ret = walk_page_buffers(handle,
-                                        page_buffers(page),
-                                        from, to, &partial,
-                                        ocfs2_ordered_zero_func);
-                if (ret < 0)
-                        mlog_errno(ret);
-        } else {
+        ret = walk_page_buffers(handle, page_buffers(page),
+                                from, to, &partial,
+                                ocfs2_zero_func);
+        if (ret < 0)
+                mlog_errno(ret);
+        else if (ocfs2_should_order_data(inode)) {
+                ret = ocfs2_jbd2_file_inode(handle, inode);
+#ifdef CONFIG_OCFS2_COMPAT_JBD
                 ret = walk_page_buffers(handle, page_buffers(page),
                                         from, to, &partial,
-                                        ocfs2_writeback_zero_func);
+                                        ocfs2_journal_dirty_data);
+#endif
                 if (ret < 0)
                         mlog_errno(ret);
         }
@@ -6206,20 +6605,29 @@ out:
         return ret;
 }
 
-static void ocfs2_zero_dinode_id2(struct inode *inode, struct ocfs2_dinode *di)
+static void ocfs2_zero_dinode_id2_with_xattr(struct inode *inode,
+                                             struct ocfs2_dinode *di)
 {
         unsigned int blocksize = 1 << inode->i_sb->s_blocksize_bits;
+        unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
 
-        memset(&di->id2, 0, blocksize - offsetof(struct ocfs2_dinode, id2));
+        if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
+                memset(&di->id2, 0, blocksize -
+                                    offsetof(struct ocfs2_dinode, id2) -
+                                    xattrsize);
+        else
+                memset(&di->id2, 0, blocksize -
+                                    offsetof(struct ocfs2_dinode, id2));
 }
 
 void ocfs2_dinode_new_extent_list(struct inode *inode,
                                   struct ocfs2_dinode *di)
 {
-        ocfs2_zero_dinode_id2(inode, di);
+        ocfs2_zero_dinode_id2_with_xattr(inode, di);
         di->id2.i_list.l_tree_depth = 0;
         di->id2.i_list.l_next_free_rec = 0;
-        di->id2.i_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(inode->i_sb));
+        di->id2.i_list.l_count = cpu_to_le16(
+                ocfs2_extent_recs_per_inode_with_xattr(inode->i_sb, di));
 }
 
 void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di)
@@ -6236,9 +6644,10 @@ void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di)
          * We clear the entire i_data structure here so that all
          * fields can be properly initialized.
          */
-        ocfs2_zero_dinode_id2(inode, di);
+        ocfs2_zero_dinode_id2_with_xattr(inode, di);
 
-        idata->id_count = cpu_to_le16(ocfs2_max_inline_data(inode->i_sb));
+        idata->id_count = cpu_to_le16(
+                        ocfs2_max_inline_data_with_xattr(inode->i_sb, di));
 }
 
 int ocfs2_convert_inline_data_to_extents(struct inode *inode,
@@ -6253,6 +6662,7 @@ int ocfs2_convert_inline_data_to_extents(struct inode *inode,
         struct ocfs2_alloc_context *data_ac = NULL;
         struct page **pages = NULL;
         loff_t end = osb->s_clustersize;
+        struct ocfs2_extent_tree et;
 
         has_data = i_size_read(inode) ? 1 : 0;
 
@@ -6352,7 +6762,8 @@ int ocfs2_convert_inline_data_to_extents(struct inode *inode,
                  * this proves to be false, we could always re-build
                  * the in-inode data from our pages.
                  */
-                ret = ocfs2_insert_extent(osb, handle, inode, di_bh,
+                ocfs2_init_dinode_extent_tree(&et, inode, di_bh);
+                ret = ocfs2_insert_extent(osb, handle, inode, &et,
                                           0, block, 1, 0, NULL);
                 if (ret) {
                         mlog_errno(ret);
@@ -6395,13 +6806,14 @@ int ocfs2_commit_truncate(struct ocfs2_super *osb,
         handle_t *handle = NULL;
         struct inode *tl_inode = osb->osb_tl_inode;
         struct ocfs2_path *path = NULL;
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
 
         mlog_entry_void();
 
         new_highest_cpos = ocfs2_clusters_for_bytes(osb->sb,
                                                      i_size_read(inode));
 
-        path = ocfs2_new_inode_path(fe_bh);
+        path = ocfs2_new_path(fe_bh, &di->id2.i_list);
         if (!path) {
                 status = -ENOMEM;
                 mlog_errno(status);
@@ -6572,8 +6984,8 @@ int ocfs2_prepare_truncate(struct ocfs2_super *osb,
         ocfs2_init_dealloc_ctxt(&(*tc)->tc_dealloc);
 
         if (fe->id2.i_list.l_tree_depth) {
-                status = ocfs2_read_block(osb, le64_to_cpu(fe->i_last_eb_blk),
-                                          &last_eb_bh, OCFS2_BH_CACHED, inode);
+                status = ocfs2_read_block(inode, le64_to_cpu(fe->i_last_eb_blk),
+                                          &last_eb_bh);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
@@ -6686,8 +7098,7 @@ static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc)
                 mlog(ML_NOTICE,
                      "Truncate completion has non-empty dealloc context\n");
 
-        if (tc->tc_last_eb_bh)
-                brelse(tc->tc_last_eb_bh);
+        brelse(tc->tc_last_eb_bh);
 
         kfree(tc);
 }
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index 60cd3d59230c..70257c84cfbe 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -26,30 +26,102 @@
 #ifndef OCFS2_ALLOC_H
 #define OCFS2_ALLOC_H
 
+
+/*
+ * For xattr tree leaf, we limit the leaf byte size to be 64K.
+ */
+#define OCFS2_MAX_XATTR_TREE_LEAF_SIZE 65536
+
+/*
+ * ocfs2_extent_tree and ocfs2_extent_tree_operations are used to abstract
+ * the b-tree operations in ocfs2. Now all the b-tree operations are not
+ * limited to ocfs2_dinode only. Any data which need to allocate clusters
+ * to store can use b-tree. And it only needs to implement its ocfs2_extent_tree
+ * and operation.
+ *
+ * ocfs2_extent_tree becomes the first-class object for extent tree
+ * manipulation.  Callers of the alloc.c code need to fill it via one of
+ * the ocfs2_init_*_extent_tree() operations below.
+ *
+ * ocfs2_extent_tree contains info for the root of the b-tree, it must have a
+ * root ocfs2_extent_list and a root_bh so that they can be used in the b-tree
+ * functions.
+ * ocfs2_extent_tree_operations abstract the normal operations we do for
+ * the root of extent b-tree.
+ */
+struct ocfs2_extent_tree_operations;
+struct ocfs2_extent_tree {
+        struct ocfs2_extent_tree_operations     *et_ops;
+        struct buffer_head                      *et_root_bh;
+        struct ocfs2_extent_list                *et_root_el;
+        void                                    *et_object;
+        unsigned int                            et_max_leaf_clusters;
+};
+
+/*
+ * ocfs2_init_*_extent_tree() will fill an ocfs2_extent_tree from the
+ * specified object buffer.
+ */
+void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
+                                   struct inode *inode,
+                                   struct buffer_head *bh);
+void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
+                                       struct inode *inode,
+                                       struct buffer_head *bh);
+void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
+                                        struct inode *inode,
+                                        struct buffer_head *bh,
+                                        struct ocfs2_xattr_value_root *xv);
+
 struct ocfs2_alloc_context;
 int ocfs2_insert_extent(struct ocfs2_super *osb,
                         handle_t *handle,
                         struct inode *inode,
-                        struct buffer_head *fe_bh,
+                        struct ocfs2_extent_tree *et,
                         u32 cpos,
                         u64 start_blk,
                         u32 new_clusters,
                         u8 flags,
                         struct ocfs2_alloc_context *meta_ac);
+
+enum ocfs2_alloc_restarted {
+        RESTART_NONE = 0,
+        RESTART_TRANS,
+        RESTART_META
+};
+int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
+                                struct inode *inode,
+                                u32 *logical_offset,
+                                u32 clusters_to_add,
+                                int mark_unwritten,
+                                struct ocfs2_extent_tree *et,
+                                handle_t *handle,
+                                struct ocfs2_alloc_context *data_ac,
+                                struct ocfs2_alloc_context *meta_ac,
+                                enum ocfs2_alloc_restarted *reason_ret);
 struct ocfs2_cached_dealloc_ctxt;
-int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *di_bh,
+int ocfs2_mark_extent_written(struct inode *inode,
+                              struct ocfs2_extent_tree *et,
                               handle_t *handle, u32 cpos, u32 len, u32 phys,
                               struct ocfs2_alloc_context *meta_ac,
                               struct ocfs2_cached_dealloc_ctxt *dealloc);
-int ocfs2_remove_extent(struct inode *inode, struct buffer_head *di_bh,
+int ocfs2_remove_extent(struct inode *inode,
+                        struct ocfs2_extent_tree *et,
                         u32 cpos, u32 len, handle_t *handle,
                         struct ocfs2_alloc_context *meta_ac,
                         struct ocfs2_cached_dealloc_ctxt *dealloc);
 int ocfs2_num_free_extents(struct ocfs2_super *osb,
                            struct inode *inode,
-                           struct ocfs2_dinode *fe);
-/* how many new metadata chunks would an allocation need at maximum? */
-static inline int ocfs2_extend_meta_needed(struct ocfs2_dinode *fe)
+                           struct ocfs2_extent_tree *et);
+
+/*
+ * how many new metadata chunks would an allocation need at maximum?
+ *
+ * Please note that the caller must make sure that root_el is the root
+ * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
+ * the result may be wrong.
+ */
+static inline int ocfs2_extend_meta_needed(struct ocfs2_extent_list *root_el)
 {
         /*
          * Rather than do all the work of determining how much we need
@@ -59,7 +131,7 @@ static inline int ocfs2_extend_meta_needed(struct ocfs2_dinode *fe)
          * new tree_depth==0 extent_block, and one block at the new
          * top-of-the tree.
          */
-        return le16_to_cpu(fe->id2.i_list.l_tree_depth) + 2;
+        return le16_to_cpu(root_el->l_tree_depth) + 2;
 }
 
 void ocfs2_dinode_new_extent_list(struct inode *inode, struct ocfs2_dinode *di);
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index a53da1466277..c22543b33420 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -68,9 +68,7 @@ static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
                 goto bail;
         }
 
-        status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
-                                  OCFS2_I(inode)->ip_blkno,
-                                  &bh, OCFS2_BH_CACHED, inode);
+        status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &bh);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -128,8 +126,7 @@ static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
         err = 0;
 
 bail:
-        if (bh)
-                brelse(bh);
+        brelse(bh);
 
         mlog_exit(err);
         return err;
@@ -261,13 +258,11 @@ static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
 {
         int ret;
         struct buffer_head *di_bh = NULL;
-        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 
         BUG_ON(!PageLocked(page));
         BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
 
-        ret = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &di_bh,
-                               OCFS2_BH_CACHED, inode);
+        ret = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &di_bh);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -485,11 +480,14 @@ handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
         }
 
         if (ocfs2_should_order_data(inode)) {
+                ret = ocfs2_jbd2_file_inode(handle, inode);
+#ifdef CONFIG_OCFS2_COMPAT_JBD
                 ret = walk_page_buffers(handle,
                                         page_buffers(page),
                                         from, to, NULL,
                                         ocfs2_journal_dirty_data);
-                if (ret < 0) 
+#endif
+                if (ret < 0)
                         mlog_errno(ret);
         }
 out:
@@ -669,7 +667,7 @@ static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
 {
         journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
 
-        journal_invalidatepage(journal, page, offset);
+        jbd2_journal_invalidatepage(journal, page, offset);
 }
 
 static int ocfs2_releasepage(struct page *page, gfp_t wait)
@@ -678,7 +676,7 @@ static int ocfs2_releasepage(struct page *page, gfp_t wait)
 
         if (!page_has_buffers(page))
                 return 0;
-        return journal_try_to_free_buffers(journal, page, wait);
+        return jbd2_journal_try_to_free_buffers(journal, page, wait);
 }
 
 static ssize_t ocfs2_direct_IO(int rw,
@@ -1074,11 +1072,15 @@ static void ocfs2_write_failure(struct inode *inode,
                 tmppage = wc->w_pages[i];
 
                 if (page_has_buffers(tmppage)) {
-                        if (ocfs2_should_order_data(inode))
+                        if (ocfs2_should_order_data(inode)) {
+                                ocfs2_jbd2_file_inode(wc->w_handle, inode);
+#ifdef CONFIG_OCFS2_COMPAT_JBD
                                 walk_page_buffers(wc->w_handle,
                                                   page_buffers(tmppage),
                                                   from, to, NULL,
                                                   ocfs2_journal_dirty_data);
+#endif
+                        }
 
                         block_commit_write(tmppage, from, to);
                 }
@@ -1242,6 +1244,7 @@ static int ocfs2_write_cluster(struct address_space *mapping,
         int ret, i, new, should_zero = 0;
         u64 v_blkno, p_blkno;
         struct inode *inode = mapping->host;
+        struct ocfs2_extent_tree et;
 
         new = phys == 0 ? 1 : 0;
         if (new || unwritten)
@@ -1255,10 +1258,10 @@ static int ocfs2_write_cluster(struct address_space *mapping,
                  * any additional semaphores or cluster locks.
                  */
                 tmp_pos = cpos;
-                ret = ocfs2_do_extend_allocation(OCFS2_SB(inode->i_sb), inode,
-                                                 &tmp_pos, 1, 0, wc->w_di_bh,
-                                                 wc->w_handle, data_ac,
-                                                 meta_ac, NULL);
+                ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
+                                           &tmp_pos, 1, 0, wc->w_di_bh,
+                                           wc->w_handle, data_ac,
+                                           meta_ac, NULL);
                 /*
                  * This shouldn't happen because we must have already
                  * calculated the correct meta data allocation required. The
@@ -1276,7 +1279,8 @@ static int ocfs2_write_cluster(struct address_space *mapping,
                         goto out;
                 }
         } else if (unwritten) {
-                ret = ocfs2_mark_extent_written(inode, wc->w_di_bh,
+                ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh);
+                ret = ocfs2_mark_extent_written(inode, &et,
                                                 wc->w_handle, cpos, 1, phys,
                                                 meta_ac, &wc->w_dealloc);
                 if (ret < 0) {
@@ -1665,6 +1669,7 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
         struct ocfs2_alloc_context *data_ac = NULL;
         struct ocfs2_alloc_context *meta_ac = NULL;
         handle_t *handle;
+        struct ocfs2_extent_tree et;
 
         ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
         if (ret) {
@@ -1712,14 +1717,23 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
                  * ocfs2_lock_allocators(). It greatly over-estimates
                  * the work to be done.
                  */
-                ret = ocfs2_lock_allocators(inode, di, clusters_to_alloc,
-                                            extents_to_split, &data_ac, &meta_ac);
+                mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u,"
+                     " clusters_to_add = %u, extents_to_split = %u\n",
+                     (unsigned long long)OCFS2_I(inode)->ip_blkno,
+                     (long long)i_size_read(inode), le32_to_cpu(di->i_clusters),
+                     clusters_to_alloc, extents_to_split);
+
+                ocfs2_init_dinode_extent_tree(&et, inode, wc->w_di_bh);
+                ret = ocfs2_lock_allocators(inode, &et,
+                                            clusters_to_alloc, extents_to_split,
+                                            &data_ac, &meta_ac);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
                 }
 
-                credits = ocfs2_calc_extend_credits(inode->i_sb, di,
+                credits = ocfs2_calc_extend_credits(inode->i_sb,
+                                                    &di->id2.i_list,
                                                     clusters_to_alloc);
 
         }
@@ -1905,11 +1919,15 @@ int ocfs2_write_end_nolock(struct address_space *mapping,
                 }
 
                 if (page_has_buffers(tmppage)) {
-                        if (ocfs2_should_order_data(inode))
+                        if (ocfs2_should_order_data(inode)) {
+                                ocfs2_jbd2_file_inode(wc->w_handle, inode);
+#ifdef CONFIG_OCFS2_COMPAT_JBD
                                 walk_page_buffers(wc->w_handle,
                                                   page_buffers(tmppage),
                                                   from, to, NULL,
                                                   ocfs2_journal_dirty_data);
+#endif
+                        }
                         block_commit_write(tmppage, from, to);
                 }
         }
diff --git a/fs/ocfs2/buffer_head_io.c b/fs/ocfs2/buffer_head_io.c
index f136639f5b41..7e947c672469 100644
--- a/fs/ocfs2/buffer_head_io.c
+++ b/fs/ocfs2/buffer_head_io.c
@@ -66,7 +66,7 @@ int ocfs2_write_block(struct ocfs2_super *osb, struct buffer_head *bh,
         /* remove from dirty list before I/O. */
         clear_buffer_dirty(bh);
 
-        get_bh(bh); /* for end_buffer_write_sync() */                   
+        get_bh(bh); /* for end_buffer_write_sync() */
         bh->b_end_io = end_buffer_write_sync;
         submit_bh(WRITE, bh);
 
@@ -88,22 +88,103 @@ out:
         return ret;
 }
 
-int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr,
-                      struct buffer_head *bhs[], int flags,
-                      struct inode *inode)
+int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
+                           unsigned int nr, struct buffer_head *bhs[])
+{
+        int status = 0;
+        unsigned int i;
+        struct buffer_head *bh;
+
+        if (!nr) {
+                mlog(ML_BH_IO, "No buffers will be read!\n");
+                goto bail;
+        }
+
+        for (i = 0 ; i < nr ; i++) {
+                if (bhs[i] == NULL) {
+                        bhs[i] = sb_getblk(osb->sb, block++);
+                        if (bhs[i] == NULL) {
+                                status = -EIO;
+                                mlog_errno(status);
+                                goto bail;
+                        }
+                }
+                bh = bhs[i];
+
+                if (buffer_jbd(bh)) {
+                        mlog(ML_ERROR,
+                             "trying to sync read a jbd "
+                             "managed bh (blocknr = %llu), skipping\n",
+                             (unsigned long long)bh->b_blocknr);
+                        continue;
+                }
+
+                if (buffer_dirty(bh)) {
+                        /* This should probably be a BUG, or
+                         * at least return an error. */
+                        mlog(ML_ERROR,
+                             "trying to sync read a dirty "
+                             "buffer! (blocknr = %llu), skipping\n",
+                             (unsigned long long)bh->b_blocknr);
+                        continue;
+                }
+
+                lock_buffer(bh);
+                if (buffer_jbd(bh)) {
+                        mlog(ML_ERROR,
+                             "block %llu had the JBD bit set "
+                             "while I was in lock_buffer!",
+                             (unsigned long long)bh->b_blocknr);
+                        BUG();
+                }
+
+                clear_buffer_uptodate(bh);
+                get_bh(bh); /* for end_buffer_read_sync() */
+                bh->b_end_io = end_buffer_read_sync;
+                submit_bh(READ, bh);
+        }
+
+        for (i = nr; i > 0; i--) {
+                bh = bhs[i - 1];
+
+                if (buffer_jbd(bh)) {
+                        mlog(ML_ERROR,
+                             "the journal got the buffer while it was "
+                             "locked for io! (blocknr = %llu)\n",
+                             (unsigned long long)bh->b_blocknr);
+                        BUG();
+                }
+
+                wait_on_buffer(bh);
+                if (!buffer_uptodate(bh)) {
+                        /* Status won't be cleared from here on out,
+                         * so we can safely record this and loop back
+                         * to cleanup the other buffers. */
+                        status = -EIO;
+                        put_bh(bh);
+                        bhs[i - 1] = NULL;
+                }
+        }
+
+bail:
+        return status;
+}
+
+int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
+                      struct buffer_head *bhs[], int flags)
 {
         int status = 0;
-        struct super_block *sb;
         int i, ignore_cache = 0;
         struct buffer_head *bh;
 
-        mlog_entry("(block=(%llu), nr=(%d), flags=%d, inode=%p)\n",
-                   (unsigned long long)block, nr, flags, inode);
+        mlog_entry("(inode=%p, block=(%llu), nr=(%d), flags=%d)\n",
+                   inode, (unsigned long long)block, nr, flags);
 
+        BUG_ON(!inode);
         BUG_ON((flags & OCFS2_BH_READAHEAD) &&
-               (!inode || !(flags & OCFS2_BH_CACHED)));
+               (flags & OCFS2_BH_IGNORE_CACHE));
 
-        if (osb == NULL || osb->sb == NULL || bhs == NULL) {
+        if (bhs == NULL) {
                 status = -EINVAL;
                 mlog_errno(status);
                 goto bail;
@@ -122,26 +203,19 @@ int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr,
                 goto bail;
         }
 
-        sb = osb->sb;
-
-        if (flags & OCFS2_BH_CACHED && !inode)
-                flags &= ~OCFS2_BH_CACHED;
-
-        if (inode)
-                mutex_lock(&OCFS2_I(inode)->ip_io_mutex);
+        mutex_lock(&OCFS2_I(inode)->ip_io_mutex);
         for (i = 0 ; i < nr ; i++) {
                 if (bhs[i] == NULL) {
-                        bhs[i] = sb_getblk(sb, block++);
+                        bhs[i] = sb_getblk(inode->i_sb, block++);
                         if (bhs[i] == NULL) {
-                                if (inode)
-                                        mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
+                                mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
                                 status = -EIO;
                                 mlog_errno(status);
                                 goto bail;
                         }
                 }
                 bh = bhs[i];
-                ignore_cache = 0;
+                ignore_cache = (flags & OCFS2_BH_IGNORE_CACHE);
 
                 /* There are three read-ahead cases here which we need to
                  * be concerned with. All three assume a buffer has
@@ -167,26 +241,27 @@ int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr,
                  *    before our is-it-in-flight check.
                  */
 
-                if (flags & OCFS2_BH_CACHED &&
-                    !ocfs2_buffer_uptodate(inode, bh)) {
+                if (!ignore_cache && !ocfs2_buffer_uptodate(inode, bh)) {
                         mlog(ML_UPTODATE,
                              "bh (%llu), inode %llu not uptodate\n",
                              (unsigned long long)bh->b_blocknr,
                              (unsigned long long)OCFS2_I(inode)->ip_blkno);
+                        /* We're using ignore_cache here to say
+                         * "go to disk" */
                         ignore_cache = 1;
                 }
 
                 /* XXX: Can we ever get this and *not* have the cached
                  * flag set? */
                 if (buffer_jbd(bh)) {
-                        if (!(flags & OCFS2_BH_CACHED) || ignore_cache)
+                        if (ignore_cache)
                                 mlog(ML_BH_IO, "trying to sync read a jbd "
                                                "managed bh (blocknr = %llu)\n",
                                      (unsigned long long)bh->b_blocknr);
                         continue;
                 }
 
-                if (!(flags & OCFS2_BH_CACHED) || ignore_cache) {
+                if (ignore_cache) {
                         if (buffer_dirty(bh)) {
                                 /* This should probably be a BUG, or
                                  * at least return an error. */
@@ -221,7 +296,7 @@ int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr,
                          * previously read-ahead buffer may have
                          * completed I/O while we were waiting for the
                          * buffer lock. */
-                        if ((flags & OCFS2_BH_CACHED)
+                        if (!(flags & OCFS2_BH_IGNORE_CACHE)
                             && !(flags & OCFS2_BH_READAHEAD)
                             && ocfs2_buffer_uptodate(inode, bh)) {
                                 unlock_buffer(bh);
@@ -265,15 +340,14 @@ int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr,
                 /* Always set the buffer in the cache, even if it was
                  * a forced read, or read-ahead which hasn't yet
                  * completed. */
-                if (inode)
-                        ocfs2_set_buffer_uptodate(inode, bh);
+                ocfs2_set_buffer_uptodate(inode, bh);
         }
-        if (inode)
-                mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
+        mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
 
         mlog(ML_BH_IO, "block=(%llu), nr=(%d), cached=%s, flags=0x%x\n", 
              (unsigned long long)block, nr,
-             (!(flags & OCFS2_BH_CACHED) || ignore_cache) ? "no" : "yes", flags);
+             ((flags & OCFS2_BH_IGNORE_CACHE) || ignore_cache) ? "no" : "yes",
+             flags);
 
 bail:
 
diff --git a/fs/ocfs2/buffer_head_io.h b/fs/ocfs2/buffer_head_io.h
index c2e78614c3e5..75e1dcb1ade7 100644
--- a/fs/ocfs2/buffer_head_io.h
+++ b/fs/ocfs2/buffer_head_io.h
@@ -31,31 +31,29 @@
 void ocfs2_end_buffer_io_sync(struct buffer_head *bh,
                              int uptodate);
 
-static inline int ocfs2_read_block(struct ocfs2_super          *osb,
+static inline int ocfs2_read_block(struct inode        *inode,
                                    u64                  off,
-                                   struct buffer_head **bh,
-                                   int                  flags,
-                                   struct inode        *inode);
+                                   struct buffer_head **bh);
 
 int ocfs2_write_block(struct ocfs2_super          *osb,
                       struct buffer_head  *bh,
                       struct inode        *inode);
-int ocfs2_read_blocks(struct ocfs2_super          *osb,
+int ocfs2_read_blocks(struct inode        *inode,
                       u64                  block,
                       int                  nr,
                       struct buffer_head  *bhs[],
-                      int                  flags,
-                      struct inode        *inode);
+                      int                  flags);
+int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
+                           unsigned int nr, struct buffer_head *bhs[]);
 
 int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
                                 struct buffer_head *bh);
 
-#define OCFS2_BH_CACHED            1
+#define OCFS2_BH_IGNORE_CACHE      1
 #define OCFS2_BH_READAHEAD         8
 
-static inline int ocfs2_read_block(struct ocfs2_super * osb, u64 off,
-                                   struct buffer_head **bh, int flags,
-                                   struct inode *inode)
+static inline int ocfs2_read_block(struct inode *inode, u64 off,
+                                   struct buffer_head **bh)
 {
         int status = 0;
 
@@ -65,8 +63,7 @@ static inline int ocfs2_read_block(struct ocfs2_super * osb, u64 off,
                 goto bail;
         }
 
-        status = ocfs2_read_blocks(osb, off, 1, bh,
-                                   flags, inode);
+        status = ocfs2_read_blocks(inode, off, 1, bh, 0);
 
 bail:
         return status;
diff --git a/fs/ocfs2/cluster/masklog.c b/fs/ocfs2/cluster/masklog.c
index 23c732f27529..d8a0cb92cef6 100644
--- a/fs/ocfs2/cluster/masklog.c
+++ b/fs/ocfs2/cluster/masklog.c
@@ -109,6 +109,7 @@ static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = {
         define_mask(CONN),
         define_mask(QUORUM),
         define_mask(EXPORT),
+        define_mask(XATTR),
         define_mask(ERROR),
         define_mask(NOTICE),
         define_mask(KTHREAD),
diff --git a/fs/ocfs2/cluster/masklog.h b/fs/ocfs2/cluster/masklog.h
index 597e064bb94f..57670c680471 100644
--- a/fs/ocfs2/cluster/masklog.h
+++ b/fs/ocfs2/cluster/masklog.h
@@ -112,6 +112,7 @@
 #define ML_CONN         0x0000000004000000ULL /* net connection management */
 #define ML_QUORUM       0x0000000008000000ULL /* net connection quorum */
 #define ML_EXPORT       0x0000000010000000ULL /* ocfs2 export operations */
+#define ML_XATTR        0x0000000020000000ULL /* ocfs2 extended attributes */
 /* bits that are infrequently given and frequently matched in the high word */
 #define ML_ERROR        0x0000000100000000ULL /* sent to KERN_ERR */
 #define ML_NOTICE       0x0000000200000000ULL /* setn to KERN_NOTICE */
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 9cce563fd627..026e6eb85187 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -82,6 +82,49 @@ static int ocfs2_do_extend_dir(struct super_block *sb,
                                struct ocfs2_alloc_context *meta_ac,
                                struct buffer_head **new_bh);
 
+static struct buffer_head *ocfs2_bread(struct inode *inode,
+                                       int block, int *err, int reada)
+{
+        struct buffer_head *bh = NULL;
+        int tmperr;
+        u64 p_blkno;
+        int readflags = 0;
+
+        if (reada)
+                readflags |= OCFS2_BH_READAHEAD;
+
+        if (((u64)block << inode->i_sb->s_blocksize_bits) >=
+            i_size_read(inode)) {
+                BUG_ON(!reada);
+                return NULL;
+        }
+
+        down_read(&OCFS2_I(inode)->ip_alloc_sem);
+        tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
+                                             NULL);
+        up_read(&OCFS2_I(inode)->ip_alloc_sem);
+        if (tmperr < 0) {
+                mlog_errno(tmperr);
+                goto fail;
+        }
+
+        tmperr = ocfs2_read_blocks(inode, p_blkno, 1, &bh, readflags);
+        if (tmperr < 0)
+                goto fail;
+
+        tmperr = 0;
+
+        *err = 0;
+        return bh;
+
+fail:
+        brelse(bh);
+        bh = NULL;
+
+        *err = -EIO;
+        return NULL;
+}
+
 /*
  * bh passed here can be an inode block or a dir data block, depending
  * on the inode inline data flag.
@@ -188,8 +231,7 @@ static struct buffer_head *ocfs2_find_entry_id(const char *name,
         struct ocfs2_dinode *di;
         struct ocfs2_inline_data *data;
 
-        ret = ocfs2_read_block(OCFS2_SB(dir->i_sb), OCFS2_I(dir)->ip_blkno,
-                               &di_bh, OCFS2_BH_CACHED, dir);
+        ret = ocfs2_read_block(dir, OCFS2_I(dir)->ip_blkno, &di_bh);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -260,14 +302,13 @@ restart:
                 }
                 if ((bh = bh_use[ra_ptr++]) == NULL)
                         goto next;
-                wait_on_buffer(bh);
-                if (!buffer_uptodate(bh)) {
-                        /* read error, skip block & hope for the best */
+                if (ocfs2_read_block(dir, block, &bh)) {
+                        /* read error, skip block & hope for the best.
+                         * ocfs2_read_block() has released the bh. */
                         ocfs2_error(dir->i_sb, "reading directory %llu, "
                                     "offset %lu\n",
                                     (unsigned long long)OCFS2_I(dir)->ip_blkno,
                                     block);
-                        brelse(bh);
                         goto next;
                 }
                 i = ocfs2_search_dirblock(bh, dir, name, namelen,
@@ -417,8 +458,7 @@ static inline int ocfs2_delete_entry_id(handle_t *handle,
         struct ocfs2_dinode *di;
         struct ocfs2_inline_data *data;
 
-        ret = ocfs2_read_block(OCFS2_SB(dir->i_sb), OCFS2_I(dir)->ip_blkno,
-                               &di_bh, OCFS2_BH_CACHED, dir);
+        ret = ocfs2_read_block(dir, OCFS2_I(dir)->ip_blkno, &di_bh);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -596,8 +636,7 @@ static int ocfs2_dir_foreach_blk_id(struct inode *inode,
         struct ocfs2_inline_data *data;
         struct ocfs2_dir_entry *de;
 
-        ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), OCFS2_I(inode)->ip_blkno,
-                               &di_bh, OCFS2_BH_CACHED, inode);
+        ret = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &di_bh);
         if (ret) {
                 mlog(ML_ERROR, "Unable to read inode block for dir %llu\n",
                      (unsigned long long)OCFS2_I(inode)->ip_blkno);
@@ -716,8 +755,7 @@ static int ocfs2_dir_foreach_blk_el(struct inode *inode,
                         for (i = ra_sectors >> (sb->s_blocksize_bits - 9);
                              i > 0; i--) {
                                 tmp = ocfs2_bread(inode, ++blk, &err, 1);
-                                if (tmp)
-                                        brelse(tmp);
+                                brelse(tmp);
                         }
                         last_ra_blk = blk;
                         ra_sectors = 8;
@@ -899,10 +937,8 @@ int ocfs2_find_files_on_disk(const char *name,
 leave:
         if (status < 0) {
                 *dirent = NULL;
-                if (*dirent_bh) {
-                        brelse(*dirent_bh);
-                        *dirent_bh = NULL;
-                }
+                brelse(*dirent_bh);
+                *dirent_bh = NULL;
         }
 
         mlog_exit(status);
@@ -951,8 +987,7 @@ int ocfs2_check_dir_for_entry(struct inode *dir,
 
         ret = 0;
 bail:
-        if (dirent_bh)
-                brelse(dirent_bh);
+        brelse(dirent_bh);
 
         mlog_exit(ret);
         return ret;
@@ -1127,8 +1162,7 @@ static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
 
         status = 0;
 bail:
-        if (new_bh)
-                brelse(new_bh);
+        brelse(new_bh);
 
         mlog_exit(status);
         return status;
@@ -1192,6 +1226,9 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
         struct buffer_head *dirdata_bh = NULL;
         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
         handle_t *handle;
+        struct ocfs2_extent_tree et;
+
+        ocfs2_init_dinode_extent_tree(&et, dir, di_bh);
 
         alloc = ocfs2_clusters_for_bytes(sb, bytes);
 
@@ -1305,8 +1342,8 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
          * This should never fail as our extent list is empty and all
          * related blocks have been journaled already.
          */
-        ret = ocfs2_insert_extent(osb, handle, dir, di_bh, 0, blkno, len, 0,
-                                  NULL);
+        ret = ocfs2_insert_extent(osb, handle, dir, &et, 0, blkno, len,
+                                  0, NULL);
         if (ret) {
                 mlog_errno(ret);
                 goto out_commit;
@@ -1337,8 +1374,8 @@ static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
                 }
                 blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
 
-                ret = ocfs2_insert_extent(osb, handle, dir, di_bh, 1, blkno,
-                                          len, 0, NULL);
+                ret = ocfs2_insert_extent(osb, handle, dir, &et, 1,
+                                          blkno, len, 0, NULL);
                 if (ret) {
                         mlog_errno(ret);
                         goto out_commit;
@@ -1383,9 +1420,9 @@ static int ocfs2_do_extend_dir(struct super_block *sb,
         if (extend) {
                 u32 offset = OCFS2_I(dir)->ip_clusters;
 
-                status = ocfs2_do_extend_allocation(OCFS2_SB(sb), dir, &offset,
-                                                    1, 0, parent_fe_bh, handle,
-                                                    data_ac, meta_ac, NULL);
+                status = ocfs2_add_inode_data(OCFS2_SB(sb), dir, &offset,
+                                              1, 0, parent_fe_bh, handle,
+                                              data_ac, meta_ac, NULL);
                 BUG_ON(status == -EAGAIN);
                 if (status < 0) {
                         mlog_errno(status);
@@ -1430,12 +1467,14 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
         int credits, num_free_extents, drop_alloc_sem = 0;
         loff_t dir_i_size;
         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
+        struct ocfs2_extent_list *el = &fe->id2.i_list;
         struct ocfs2_alloc_context *data_ac = NULL;
         struct ocfs2_alloc_context *meta_ac = NULL;
         handle_t *handle = NULL;
         struct buffer_head *new_bh = NULL;
         struct ocfs2_dir_entry * de;
         struct super_block *sb = osb->sb;
+        struct ocfs2_extent_tree et;
 
         mlog_entry_void();
 
@@ -1479,7 +1518,8 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
         spin_lock(&OCFS2_I(dir)->ip_lock);
         if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {
                 spin_unlock(&OCFS2_I(dir)->ip_lock);
-                num_free_extents = ocfs2_num_free_extents(osb, dir, fe);
+                ocfs2_init_dinode_extent_tree(&et, dir, parent_fe_bh);
+                num_free_extents = ocfs2_num_free_extents(osb, dir, &et);
                 if (num_free_extents < 0) {
                         status = num_free_extents;
                         mlog_errno(status);
@@ -1487,7 +1527,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
                 }
 
                 if (!num_free_extents) {
-                        status = ocfs2_reserve_new_metadata(osb, fe, &meta_ac);
+                        status = ocfs2_reserve_new_metadata(osb, el, &meta_ac);
                         if (status < 0) {
                                 if (status != -ENOSPC)
                                         mlog_errno(status);
@@ -1502,7 +1542,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
                         goto bail;
                 }
 
-                credits = ocfs2_calc_extend_credits(sb, fe, 1);
+                credits = ocfs2_calc_extend_credits(sb, el, 1);
         } else {
                 spin_unlock(&OCFS2_I(dir)->ip_lock);
                 credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
@@ -1568,8 +1608,7 @@ bail:
         if (meta_ac)
                 ocfs2_free_alloc_context(meta_ac);
 
-        if (new_bh)
-                brelse(new_bh);
+        brelse(new_bh);
 
         mlog_exit(status);
         return status;
@@ -1696,8 +1735,7 @@ static int ocfs2_find_dir_space_el(struct inode *dir, const char *name,
 
         status = 0;
 bail:
-        if (bh)
-                brelse(bh);
+        brelse(bh);
 
         mlog_exit(status);
         return status;
@@ -1756,7 +1794,6 @@ int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
         *ret_de_bh = bh;
         bh = NULL;
 out:
-        if (bh)
-                brelse(bh);
+        brelse(bh);
         return ret;
 }
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index eae3d643a5e4..ec684426034b 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -2024,8 +2024,7 @@ static int ocfs2_inode_lock_update(struct inode *inode,
         } else {
                 /* Boo, we have to go to disk. */
                 /* read bh, cast, ocfs2_refresh_inode */
-                status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno,
-                                          bh, OCFS2_BH_CACHED, inode);
+                status = ocfs2_read_block(inode, oi->ip_blkno, bh);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail_refresh;
@@ -2086,11 +2085,7 @@ static int ocfs2_assign_bh(struct inode *inode,
                 return 0;
         }
 
-        status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
-                                  OCFS2_I(inode)->ip_blkno,
-                                  ret_bh,
-                                  OCFS2_BH_CACHED,
-                                  inode);
+        status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, ret_bh);
         if (status < 0)
                 mlog_errno(status);
 
diff --git a/fs/ocfs2/extent_map.c b/fs/ocfs2/extent_map.c
index aed268e80b49..2baedac58234 100644
--- a/fs/ocfs2/extent_map.c
+++ b/fs/ocfs2/extent_map.c
@@ -293,8 +293,7 @@ static int ocfs2_last_eb_is_empty(struct inode *inode,
         struct ocfs2_extent_block *eb;
         struct ocfs2_extent_list *el;
 
-        ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), last_eb_blk,
-                               &eb_bh, OCFS2_BH_CACHED, inode);
+        ret = ocfs2_read_block(inode, last_eb_blk, &eb_bh);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
@@ -382,9 +381,9 @@ static int ocfs2_figure_hole_clusters(struct inode *inode,
                 if (le64_to_cpu(eb->h_next_leaf_blk) == 0ULL)
                         goto no_more_extents;
 
-                ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
+                ret = ocfs2_read_block(inode,
                                        le64_to_cpu(eb->h_next_leaf_blk),
-                                       &next_eb_bh, OCFS2_BH_CACHED, inode);
+                                       &next_eb_bh);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -551,6 +550,66 @@ static void ocfs2_relative_extent_offsets(struct super_block *sb,
                 *num_clusters = le16_to_cpu(rec->e_leaf_clusters) - coff;
 }
 
+int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
+                             u32 *p_cluster, u32 *num_clusters,
+                             struct ocfs2_extent_list *el)
+{
+        int ret = 0, i;
+        struct buffer_head *eb_bh = NULL;
+        struct ocfs2_extent_block *eb;
+        struct ocfs2_extent_rec *rec;
+        u32 coff;
+
+        if (el->l_tree_depth) {
+                ret = ocfs2_find_leaf(inode, el, v_cluster, &eb_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                eb = (struct ocfs2_extent_block *) eb_bh->b_data;
+                el = &eb->h_list;
+
+                if (el->l_tree_depth) {
+                        ocfs2_error(inode->i_sb,
+                                    "Inode %lu has non zero tree depth in "
+                                    "xattr leaf block %llu\n", inode->i_ino,
+                                    (unsigned long long)eb_bh->b_blocknr);
+                        ret = -EROFS;
+                        goto out;
+                }
+        }
+
+        i = ocfs2_search_extent_list(el, v_cluster);
+        if (i == -1) {
+                ret = -EROFS;
+                mlog_errno(ret);
+                goto out;
+        } else {
+                rec = &el->l_recs[i];
+                BUG_ON(v_cluster < le32_to_cpu(rec->e_cpos));
+
+                if (!rec->e_blkno) {
+                        ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
+                                    "record (%u, %u, 0) in xattr", inode->i_ino,
+                                    le32_to_cpu(rec->e_cpos),
+                                    ocfs2_rec_clusters(el, rec));
+                        ret = -EROFS;
+                        goto out;
+                }
+                coff = v_cluster - le32_to_cpu(rec->e_cpos);
+                *p_cluster = ocfs2_blocks_to_clusters(inode->i_sb,
+                                                    le64_to_cpu(rec->e_blkno));
+                *p_cluster = *p_cluster + coff;
+                if (num_clusters)
+                        *num_clusters = ocfs2_rec_clusters(el, rec) - coff;
+        }
+out:
+        if (eb_bh)
+                brelse(eb_bh);
+        return ret;
+}
+
 int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
                        u32 *p_cluster, u32 *num_clusters,
                        unsigned int *extent_flags)
@@ -571,8 +630,7 @@ int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
         if (ret == 0)
                 goto out;
 
-        ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), OCFS2_I(inode)->ip_blkno,
-                               &di_bh, OCFS2_BH_CACHED, inode);
+        ret = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &di_bh);
         if (ret) {
                 mlog_errno(ret);
                 goto out;
diff --git a/fs/ocfs2/extent_map.h b/fs/ocfs2/extent_map.h
index 1b97490e1ea8..1c4aa8b06f34 100644
--- a/fs/ocfs2/extent_map.h
+++ b/fs/ocfs2/extent_map.h
@@ -53,4 +53,8 @@ int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
 int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
                  u64 map_start, u64 map_len);
 
+int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
+                             u32 *p_cluster, u32 *num_clusters,
+                             struct ocfs2_extent_list *el);
+
 #endif  /* _EXTENT_MAP_H */
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index ed38796052d2..8d3225a78073 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -55,6 +55,7 @@
 #include "mmap.h"
 #include "suballoc.h"
 #include "super.h"
+#include "xattr.h"
 
 #include "buffer_head_io.h"
 
@@ -184,7 +185,7 @@ static int ocfs2_sync_file(struct file *file,
                 goto bail;
 
         journal = osb->journal->j_journal;
-        err = journal_force_commit(journal);
+        err = jbd2_journal_force_commit(journal);
 
 bail:
         mlog_exit(err);
@@ -488,7 +489,7 @@ bail:
 }
 
 /*
- * extend allocation only here.
+ * extend file allocation only here.
  * we'll update all the disk stuff, and oip->alloc_size
  *
  * expect stuff to be locked, a transaction started and enough data /
@@ -497,189 +498,25 @@ bail:
  * Will return -EAGAIN, and a reason if a restart is needed.
  * If passed in, *reason will always be set, even in error.
  */
-int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
-                               struct inode *inode,
-                               u32 *logical_offset,
-                               u32 clusters_to_add,
-                               int mark_unwritten,
-                               struct buffer_head *fe_bh,
-                               handle_t *handle,
-                               struct ocfs2_alloc_context *data_ac,
-                               struct ocfs2_alloc_context *meta_ac,
-                               enum ocfs2_alloc_restarted *reason_ret)
+int ocfs2_add_inode_data(struct ocfs2_super *osb,
+                         struct inode *inode,
+                         u32 *logical_offset,
+                         u32 clusters_to_add,
+                         int mark_unwritten,
+                         struct buffer_head *fe_bh,
+                         handle_t *handle,
+                         struct ocfs2_alloc_context *data_ac,
+                         struct ocfs2_alloc_context *meta_ac,
+                         enum ocfs2_alloc_restarted *reason_ret)
 {
-        int status = 0;
-        int free_extents;
-        struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
-        enum ocfs2_alloc_restarted reason = RESTART_NONE;
-        u32 bit_off, num_bits;
-        u64 block;
-        u8 flags = 0;
-
-        BUG_ON(!clusters_to_add);
-
-        if (mark_unwritten)
-                flags = OCFS2_EXT_UNWRITTEN;
-
-        free_extents = ocfs2_num_free_extents(osb, inode, fe);
-        if (free_extents < 0) {
-                status = free_extents;
-                mlog_errno(status);
-                goto leave;
-        }
-
-        /* there are two cases which could cause us to EAGAIN in the
-         * we-need-more-metadata case:
-         * 1) we haven't reserved *any*
-         * 2) we are so fragmented, we've needed to add metadata too
-         *    many times. */
-        if (!free_extents && !meta_ac) {
-                mlog(0, "we haven't reserved any metadata!\n");
-                status = -EAGAIN;
-                reason = RESTART_META;
-                goto leave;
-        } else if ((!free_extents)
-                   && (ocfs2_alloc_context_bits_left(meta_ac)
-                       < ocfs2_extend_meta_needed(fe))) {
-                mlog(0, "filesystem is really fragmented...\n");
-                status = -EAGAIN;
-                reason = RESTART_META;
-                goto leave;
-        }
-
-        status = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
-                                        clusters_to_add, &bit_off, &num_bits);
-        if (status < 0) {
-                if (status != -ENOSPC)
-                        mlog_errno(status);
-                goto leave;
-        }
-
-        BUG_ON(num_bits > clusters_to_add);
-
-        /* reserve our write early -- insert_extent may update the inode */
-        status = ocfs2_journal_access(handle, inode, fe_bh,
-                                      OCFS2_JOURNAL_ACCESS_WRITE);
-        if (status < 0) {
-                mlog_errno(status);
-                goto leave;
-        }
-
-        block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
-        mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
-             num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
-        status = ocfs2_insert_extent(osb, handle, inode, fe_bh,
-                                     *logical_offset, block, num_bits,
-                                     flags, meta_ac);
-        if (status < 0) {
-                mlog_errno(status);
-                goto leave;
-        }
-
-        status = ocfs2_journal_dirty(handle, fe_bh);
-        if (status < 0) {
-                mlog_errno(status);
-                goto leave;
-        }
-
-        clusters_to_add -= num_bits;
-        *logical_offset += num_bits;
-
-        if (clusters_to_add) {
-                mlog(0, "need to alloc once more, clusters = %u, wanted = "
-                     "%u\n", fe->i_clusters, clusters_to_add);
-                status = -EAGAIN;
-                reason = RESTART_TRANS;
-        }
-
-leave:
-        mlog_exit(status);
-        if (reason_ret)
-                *reason_ret = reason;
-        return status;
-}
-
-/*
- * For a given allocation, determine which allocators will need to be
- * accessed, and lock them, reserving the appropriate number of bits.
- *
- * Sparse file systems call this from ocfs2_write_begin_nolock()
- * and ocfs2_allocate_unwritten_extents().
- *
- * File systems which don't support holes call this from
- * ocfs2_extend_allocation().
- */
-int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
-                          u32 clusters_to_add, u32 extents_to_split,
-                          struct ocfs2_alloc_context **data_ac,
-                          struct ocfs2_alloc_context **meta_ac)
-{
-        int ret = 0, num_free_extents;
-        unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
-        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
-
-        *meta_ac = NULL;
-        if (data_ac)
-                *data_ac = NULL;
-
-        BUG_ON(clusters_to_add != 0 && data_ac == NULL);
-
-        mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
-             "clusters_to_add = %u, extents_to_split = %u\n",
-             (unsigned long long)OCFS2_I(inode)->ip_blkno, (long long)i_size_read(inode),
-             le32_to_cpu(di->i_clusters), clusters_to_add, extents_to_split);
-
-        num_free_extents = ocfs2_num_free_extents(osb, inode, di);
-        if (num_free_extents < 0) {
-                ret = num_free_extents;
-                mlog_errno(ret);
-                goto out;
-        }
-
-        /*
-         * Sparse allocation file systems need to be more conservative
-         * with reserving room for expansion - the actual allocation
-         * happens while we've got a journal handle open so re-taking
-         * a cluster lock (because we ran out of room for another
-         * extent) will violate ordering rules.
-         *
-         * Most of the time we'll only be seeing this 1 cluster at a time
-         * anyway.
-         *
-         * Always lock for any unwritten extents - we might want to
-         * add blocks during a split.
-         */
-        if (!num_free_extents ||
-            (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
-                ret = ocfs2_reserve_new_metadata(osb, di, meta_ac);
-                if (ret < 0) {
-                        if (ret != -ENOSPC)
-                                mlog_errno(ret);
-                        goto out;
-                }
-        }
-
-        if (clusters_to_add == 0)
-                goto out;
-
-        ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
-        if (ret < 0) {
-                if (ret != -ENOSPC)
-                        mlog_errno(ret);
-                goto out;
-        }
-
-out:
-        if (ret) {
-                if (*meta_ac) {
-                        ocfs2_free_alloc_context(*meta_ac);
-                        *meta_ac = NULL;
-                }
+        int ret;
+        struct ocfs2_extent_tree et;
 
-                /*
-                 * We cannot have an error and a non null *data_ac.
-                 */
-        }
+        ocfs2_init_dinode_extent_tree(&et, inode, fe_bh);
+        ret = ocfs2_add_clusters_in_btree(osb, inode, logical_offset,
+                                           clusters_to_add, mark_unwritten,
+                                           &et, handle,
+                                           data_ac, meta_ac, reason_ret);
 
         return ret;
 }
@@ -698,6 +535,7 @@ static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
         struct ocfs2_alloc_context *meta_ac = NULL;
         enum ocfs2_alloc_restarted why;
         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_extent_tree et;
 
         mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
 
@@ -707,8 +545,7 @@ static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
          */
         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
 
-        status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
-                                  OCFS2_BH_CACHED, inode);
+        status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, &bh);
         if (status < 0) {
                 mlog_errno(status);
                 goto leave;
@@ -724,14 +561,21 @@ static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 restart_all:
         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 
-        status = ocfs2_lock_allocators(inode, fe, clusters_to_add, 0, &data_ac,
-                                       &meta_ac);
+        mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
+             "clusters_to_add = %u\n",
+             (unsigned long long)OCFS2_I(inode)->ip_blkno,
+             (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
+             clusters_to_add);
+        ocfs2_init_dinode_extent_tree(&et, inode, bh);
+        status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
+                                       &data_ac, &meta_ac);
         if (status) {
                 mlog_errno(status);
                 goto leave;
         }
 
-        credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add);
+        credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list,
+                                            clusters_to_add);
         handle = ocfs2_start_trans(osb, credits);
         if (IS_ERR(handle)) {
                 status = PTR_ERR(handle);
@@ -753,16 +597,16 @@ restarted_transaction:
 
         prev_clusters = OCFS2_I(inode)->ip_clusters;
 
-        status = ocfs2_do_extend_allocation(osb,
-                                            inode,
-                                            &logical_start,
-                                            clusters_to_add,
-                                            mark_unwritten,
-                                            bh,
-                                            handle,
-                                            data_ac,
-                                            meta_ac,
-                                            &why);
+        status = ocfs2_add_inode_data(osb,
+                                      inode,
+                                      &logical_start,
+                                      clusters_to_add,
+                                      mark_unwritten,
+                                      bh,
+                                      handle,
+                                      data_ac,
+                                      meta_ac,
+                                      &why);
         if ((status < 0) && (status != -EAGAIN)) {
                 if (status != -ENOSPC)
                         mlog_errno(status);
@@ -789,7 +633,7 @@ restarted_transaction:
                         mlog(0, "restarting transaction.\n");
                         /* TODO: This can be more intelligent. */
                         credits = ocfs2_calc_extend_credits(osb->sb,
-                                                            fe,
+                                                            &fe->id2.i_list,
                                                             clusters_to_add);
                         status = ocfs2_extend_trans(handle, credits);
                         if (status < 0) {
@@ -826,10 +670,8 @@ leave:
                 restart_func = 0;
                 goto restart_all;
         }
-        if (bh) {
-                brelse(bh);
-                bh = NULL;
-        }
+        brelse(bh);
+        bh = NULL;
 
         mlog_exit(status);
         return status;
@@ -1096,9 +938,15 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
                         goto bail_unlock;
                 }
 
-                if (i_size_read(inode) > attr->ia_size)
+                if (i_size_read(inode) > attr->ia_size) {
+                        if (ocfs2_should_order_data(inode)) {
+                                status = ocfs2_begin_ordered_truncate(inode,
+                                                                      attr->ia_size);
+                                if (status)
+                                        goto bail_unlock;
+                        }
                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
-                else
+                } else
                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
                 if (status < 0) {
                         if (status != -ENOSPC)
@@ -1140,8 +988,7 @@ bail_unlock_rw:
         if (size_change)
                 ocfs2_rw_unlock(inode, 1);
 bail:
-        if (bh)
-                brelse(bh);
+        brelse(bh);
 
         mlog_exit(status);
         return status;
@@ -1284,8 +1131,7 @@ static int ocfs2_write_remove_suid(struct inode *inode)
         struct buffer_head *bh = NULL;
         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 
-        ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
-                               oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode);
+        ret = ocfs2_read_block(inode, oi->ip_blkno, &bh);
         if (ret < 0) {
                 mlog_errno(ret);
                 goto out;
@@ -1311,9 +1157,8 @@ static int ocfs2_allocate_unwritten_extents(struct inode *inode,
         struct buffer_head *di_bh = NULL;
 
         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
-                ret = ocfs2_read_block(OCFS2_SB(inode->i_sb),
-                                       OCFS2_I(inode)->ip_blkno, &di_bh,
-                                       OCFS2_BH_CACHED, inode);
+                ret = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno,
+                                       &di_bh);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -1394,8 +1239,11 @@ static int __ocfs2_remove_inode_range(struct inode *inode,
         handle_t *handle;
         struct ocfs2_alloc_context *meta_ac = NULL;
         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        struct ocfs2_extent_tree et;
 
-        ret = ocfs2_lock_allocators(inode, di, 0, 1, NULL, &meta_ac);
+        ocfs2_init_dinode_extent_tree(&et, inode, di_bh);
+
+        ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
         if (ret) {
                 mlog_errno(ret);
                 return ret;
@@ -1425,7 +1273,7 @@ static int __ocfs2_remove_inode_range(struct inode *inode,
                 goto out;
         }
 
-        ret = ocfs2_remove_extent(inode, di_bh, cpos, len, handle, meta_ac,
+        ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
                                   dealloc);
         if (ret) {
                 mlog_errno(ret);
@@ -2040,7 +1888,7 @@ out_dio:
                  */
                 if (old_size != i_size_read(inode) ||
                     old_clusters != OCFS2_I(inode)->ip_clusters) {
-                        ret = journal_force_commit(osb->journal->j_journal);
+                        ret = jbd2_journal_force_commit(osb->journal->j_journal);
                         if (ret < 0)
                                 written = ret;
                 }
@@ -2227,6 +2075,10 @@ const struct inode_operations ocfs2_file_iops = {
         .setattr        = ocfs2_setattr,
         .getattr        = ocfs2_getattr,
         .permission     = ocfs2_permission,
+        .setxattr       = generic_setxattr,
+        .getxattr       = generic_getxattr,
+        .listxattr      = ocfs2_listxattr,
+        .removexattr    = generic_removexattr,
         .fallocate      = ocfs2_fallocate,
         .fiemap         = ocfs2_fiemap,
 };
@@ -2237,6 +2089,10 @@ const struct inode_operations ocfs2_special_file_iops = {
         .permission     = ocfs2_permission,
 };
 
+/*
+ * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
+ * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
+ */
 const struct file_operations ocfs2_fops = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
@@ -2251,6 +2107,7 @@ const struct file_operations ocfs2_fops = {
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = ocfs2_compat_ioctl,
 #endif
+        .lock           = ocfs2_lock,
         .flock          = ocfs2_flock,
         .splice_read    = ocfs2_file_splice_read,
         .splice_write   = ocfs2_file_splice_write,
@@ -2267,5 +2124,51 @@ const struct file_operations ocfs2_dops = {
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = ocfs2_compat_ioctl,
 #endif
+        .lock           = ocfs2_lock,
+        .flock          = ocfs2_flock,
+};
+
+/*
+ * POSIX-lockless variants of our file_operations.
+ *
+ * These will be used if the underlying cluster stack does not support
+ * posix file locking, if the user passes the "localflocks" mount
+ * option, or if we have a local-only fs.
+ *
+ * ocfs2_flock is in here because all stacks handle UNIX file locks,
+ * so we still want it in the case of no stack support for
+ * plocks. Internally, it will do the right thing when asked to ignore
+ * the cluster.
+ */
+const struct file_operations ocfs2_fops_no_plocks = {
+        .llseek         = generic_file_llseek,
+        .read           = do_sync_read,
+        .write          = do_sync_write,
+        .mmap           = ocfs2_mmap,
+        .fsync          = ocfs2_sync_file,
+        .release        = ocfs2_file_release,
+        .open           = ocfs2_file_open,
+        .aio_read       = ocfs2_file_aio_read,
+        .aio_write      = ocfs2_file_aio_write,
+        .unlocked_ioctl = ocfs2_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = ocfs2_compat_ioctl,
+#endif
+        .flock          = ocfs2_flock,
+        .splice_read    = ocfs2_file_splice_read,
+        .splice_write   = ocfs2_file_splice_write,
+};
+
+const struct file_operations ocfs2_dops_no_plocks = {
+        .llseek         = generic_file_llseek,
+        .read           = generic_read_dir,
+        .readdir        = ocfs2_readdir,
+        .fsync          = ocfs2_sync_file,
+        .release        = ocfs2_dir_release,
+        .open           = ocfs2_dir_open,
+        .unlocked_ioctl = ocfs2_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = ocfs2_compat_ioctl,
+#endif
         .flock          = ocfs2_flock,
 };
diff --git a/fs/ocfs2/file.h b/fs/ocfs2/file.h
index 1e27b4d017ea..e92382cbca5f 100644
--- a/fs/ocfs2/file.h
+++ b/fs/ocfs2/file.h
@@ -28,9 +28,12 @@
 
 extern const struct file_operations ocfs2_fops;
 extern const struct file_operations ocfs2_dops;
+extern const struct file_operations ocfs2_fops_no_plocks;
+extern const struct file_operations ocfs2_dops_no_plocks;
 extern const struct inode_operations ocfs2_file_iops;
 extern const struct inode_operations ocfs2_special_file_iops;
 struct ocfs2_alloc_context;
+enum ocfs2_alloc_restarted;
 
 struct ocfs2_file_private {
         struct file             *fp_file;
@@ -38,27 +41,18 @@ struct ocfs2_file_private {
         struct ocfs2_lock_res   fp_flock;
 };
 
-enum ocfs2_alloc_restarted {
-        RESTART_NONE = 0,
-        RESTART_TRANS,
-        RESTART_META
-};
-int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
-                               struct inode *inode,
-                               u32 *logical_offset,
-                               u32 clusters_to_add,
-                               int mark_unwritten,
-                               struct buffer_head *fe_bh,
-                               handle_t *handle,
-                               struct ocfs2_alloc_context *data_ac,
-                               struct ocfs2_alloc_context *meta_ac,
-                               enum ocfs2_alloc_restarted *reason_ret);
+int ocfs2_add_inode_data(struct ocfs2_super *osb,
+                         struct inode *inode,
+                         u32 *logical_offset,
+                         u32 clusters_to_add,
+                         int mark_unwritten,
+                         struct buffer_head *fe_bh,
+                         handle_t *handle,
+                         struct ocfs2_alloc_context *data_ac,
+                         struct ocfs2_alloc_context *meta_ac,
+                         enum ocfs2_alloc_restarted *reason_ret);
 int ocfs2_extend_no_holes(struct inode *inode, u64 new_i_size,
                           u64 zero_to);
-int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
-                          u32 clusters_to_add, u32 extents_to_split,
-                          struct ocfs2_alloc_context **data_ac,
-                          struct ocfs2_alloc_context **meta_ac);
 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr);
 int ocfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
                   struct kstat *stat);
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 7e9e4c79aec7..4903688f72a9 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -49,6 +49,7 @@
 #include "symlink.h"
 #include "sysfile.h"
 #include "uptodate.h"
+#include "xattr.h"
 
 #include "buffer_head_io.h"
 
@@ -219,6 +220,7 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
         struct super_block *sb;
         struct ocfs2_super *osb;
         int status = -EINVAL;
+        int use_plocks = 1;
 
         mlog_entry("(0x%p, size:%llu)\n", inode,
                    (unsigned long long)le64_to_cpu(fe->i_size));
@@ -226,6 +228,10 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
         sb = inode->i_sb;
         osb = OCFS2_SB(sb);
 
+        if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
+            ocfs2_mount_local(osb) || !ocfs2_stack_supports_plocks())
+                use_plocks = 0;
+
         /* this means that read_inode cannot create a superblock inode
          * today.  change if needed. */
         if (!OCFS2_IS_VALID_DINODE(fe) ||
@@ -295,13 +301,19 @@ int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
 
         switch (inode->i_mode & S_IFMT) {
             case S_IFREG:
-                    inode->i_fop = &ocfs2_fops;
+                    if (use_plocks)
+                            inode->i_fop = &ocfs2_fops;
+                    else
+                            inode->i_fop = &ocfs2_fops_no_plocks;
                     inode->i_op = &ocfs2_file_iops;
                     i_size_write(inode, le64_to_cpu(fe->i_size));
                     break;
             case S_IFDIR:
                     inode->i_op = &ocfs2_dir_iops;
-                    inode->i_fop = &ocfs2_dops;
+                    if (use_plocks)
+                            inode->i_fop = &ocfs2_dops;
+                    else
+                            inode->i_fop = &ocfs2_dops_no_plocks;
                     i_size_write(inode, le64_to_cpu(fe->i_size));
                     break;
             case S_IFLNK:
@@ -448,8 +460,11 @@ static int ocfs2_read_locked_inode(struct inode *inode,
                 }
         }
 
-        status = ocfs2_read_block(osb, args->fi_blkno, &bh, 0,
-                                  can_lock ? inode : NULL);
+        if (can_lock)
+                status = ocfs2_read_blocks(inode, args->fi_blkno, 1, &bh,
+                                           OCFS2_BH_IGNORE_CACHE);
+        else
+                status = ocfs2_read_blocks_sync(osb, args->fi_blkno, 1, &bh);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -522,6 +537,9 @@ static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
          * data and fast symlinks.
          */
         if (fe->i_clusters) {
+                if (ocfs2_should_order_data(inode))
+                        ocfs2_begin_ordered_truncate(inode, 0);
+
                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
                 if (IS_ERR(handle)) {
                         status = PTR_ERR(handle);
@@ -730,6 +748,13 @@ static int ocfs2_wipe_inode(struct inode *inode,
                 goto bail_unlock_dir;
         }
 
+        /*Free extended attribute resources associated with this inode.*/
+        status = ocfs2_xattr_remove(inode, di_bh);
+        if (status < 0) {
+                mlog_errno(status);
+                goto bail_unlock_dir;
+        }
+
         status = ocfs2_remove_inode(inode, di_bh, orphan_dir_inode,
                                     orphan_dir_bh);
         if (status < 0)
@@ -1081,6 +1106,8 @@ void ocfs2_clear_inode(struct inode *inode)
         oi->ip_last_trans = 0;
         oi->ip_dir_start_lookup = 0;
         oi->ip_blkno = 0ULL;
+        jbd2_journal_release_jbd_inode(OCFS2_SB(inode->i_sb)->journal->j_journal,
+                                       &oi->ip_jinode);
 
 bail:
         mlog_exit_void();
@@ -1107,58 +1134,6 @@ void ocfs2_drop_inode(struct inode *inode)
 }
 
 /*
- * TODO: this should probably be merged into ocfs2_get_block
- *
- * However, you now need to pay attention to the cont_prepare_write()
- * stuff in ocfs2_get_block (that is, ocfs2_get_block pretty much
- * expects never to extend).
- */
-struct buffer_head *ocfs2_bread(struct inode *inode,
-                                int block, int *err, int reada)
-{
-        struct buffer_head *bh = NULL;
-        int tmperr;
-        u64 p_blkno;
-        int readflags = OCFS2_BH_CACHED;
-
-        if (reada)
-                readflags |= OCFS2_BH_READAHEAD;
-
-        if (((u64)block << inode->i_sb->s_blocksize_bits) >=
-            i_size_read(inode)) {
-                BUG_ON(!reada);
-                return NULL;
-        }
-
-        down_read(&OCFS2_I(inode)->ip_alloc_sem);
-        tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
-                                             NULL);
-        up_read(&OCFS2_I(inode)->ip_alloc_sem);
-        if (tmperr < 0) {
-                mlog_errno(tmperr);
-                goto fail;
-        }
-
-        tmperr = ocfs2_read_block(OCFS2_SB(inode->i_sb), p_blkno, &bh,
-                                  readflags, inode);
-        if (tmperr < 0)
-                goto fail;
-
-        tmperr = 0;
-
-        *err = 0;
-        return bh;
-
-fail:
-        if (bh) {
-                brelse(bh);
-                bh = NULL;
-        }
-        *err = -EIO;
-        return NULL;
-}
-
-/*
  * This is called from our getattr.
  */
 int ocfs2_inode_revalidate(struct dentry *dentry)
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index 390a85596aa0..2f37af9bcc4a 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -40,6 +40,9 @@ struct ocfs2_inode_info
         /* protects allocation changes on this inode. */
         struct rw_semaphore             ip_alloc_sem;
 
+        /* protects extended attribute changes on this inode */
+        struct rw_semaphore             ip_xattr_sem;
+
         /* These fields are protected by ip_lock */
         spinlock_t                      ip_lock;
         u32                             ip_open_count;
@@ -68,6 +71,7 @@ struct ocfs2_inode_info
         struct ocfs2_extent_map         ip_extent_map;
 
         struct inode                    vfs_inode;
+        struct jbd2_inode               ip_jinode;
 };
 
 /*
@@ -113,8 +117,6 @@ extern struct kmem_cache *ocfs2_inode_cache;
 
 extern const struct address_space_operations ocfs2_aops;
 
-struct buffer_head *ocfs2_bread(struct inode *inode, int block,
-                                int *err, int reada);
 void ocfs2_clear_inode(struct inode *inode);
 void ocfs2_delete_inode(struct inode *inode);
 void ocfs2_drop_inode(struct inode *inode);
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index 7b142f0ce995..9fcd36dcc9a0 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -102,8 +102,7 @@ bail_unlock:
 bail:
         mutex_unlock(&inode->i_mutex);
 
-        if (bh)
-                brelse(bh);
+        brelse(bh);
 
         mlog_exit(status);
         return status;
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index c47bc2a809c2..81e40677eecb 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -215,9 +215,9 @@ static int ocfs2_commit_cache(struct ocfs2_super *osb)
                 goto finally;
         }
 
-        journal_lock_updates(journal->j_journal);
-        status = journal_flush(journal->j_journal);
-        journal_unlock_updates(journal->j_journal);
+        jbd2_journal_lock_updates(journal->j_journal);
+        status = jbd2_journal_flush(journal->j_journal);
+        jbd2_journal_unlock_updates(journal->j_journal);
         if (status < 0) {
                 up_write(&journal->j_trans_barrier);
                 mlog_errno(status);
@@ -264,7 +264,7 @@ handle_t *ocfs2_start_trans(struct ocfs2_super *osb, int max_buffs)
 
         down_read(&osb->journal->j_trans_barrier);
 
-        handle = journal_start(journal, max_buffs);
+        handle = jbd2_journal_start(journal, max_buffs);
         if (IS_ERR(handle)) {
                 up_read(&osb->journal->j_trans_barrier);
 
@@ -290,7 +290,7 @@ int ocfs2_commit_trans(struct ocfs2_super *osb,
 
         BUG_ON(!handle);
 
-        ret = journal_stop(handle);
+        ret = jbd2_journal_stop(handle);
         if (ret < 0)
                 mlog_errno(ret);
 
@@ -304,7 +304,7 @@ int ocfs2_commit_trans(struct ocfs2_super *osb,
  * transaction. extend_trans will either extend the current handle by
  * nblocks, or commit it and start a new one with nblocks credits.
  *
- * This might call journal_restart() which will commit dirty buffers
+ * This might call jbd2_journal_restart() which will commit dirty buffers
  * and then restart the transaction. Before calling
  * ocfs2_extend_trans(), any changed blocks should have been
  * dirtied. After calling it, all blocks which need to be changed must
@@ -332,7 +332,7 @@ int ocfs2_extend_trans(handle_t *handle, int nblocks)
 #ifdef CONFIG_OCFS2_DEBUG_FS
         status = 1;
 #else
-        status = journal_extend(handle, nblocks);
+        status = jbd2_journal_extend(handle, nblocks);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -340,8 +340,10 @@ int ocfs2_extend_trans(handle_t *handle, int nblocks)
 #endif
 
         if (status > 0) {
-                mlog(0, "journal_extend failed, trying journal_restart\n");
-                status = journal_restart(handle, nblocks);
+                mlog(0,
+                     "jbd2_journal_extend failed, trying "
+                     "jbd2_journal_restart\n");
+                status = jbd2_journal_restart(handle, nblocks);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
@@ -393,11 +395,11 @@ int ocfs2_journal_access(handle_t *handle,
         switch (type) {
         case OCFS2_JOURNAL_ACCESS_CREATE:
         case OCFS2_JOURNAL_ACCESS_WRITE:
-                status = journal_get_write_access(handle, bh);
+                status = jbd2_journal_get_write_access(handle, bh);
                 break;
 
         case OCFS2_JOURNAL_ACCESS_UNDO:
-                status = journal_get_undo_access(handle, bh);
+                status = jbd2_journal_get_undo_access(handle, bh);
                 break;
 
         default:
@@ -422,7 +424,7 @@ int ocfs2_journal_dirty(handle_t *handle,
         mlog_entry("(bh->b_blocknr=%llu)\n",
                    (unsigned long long)bh->b_blocknr);
 
-        status = journal_dirty_metadata(handle, bh);
+        status = jbd2_journal_dirty_metadata(handle, bh);
         if (status < 0)
                 mlog(ML_ERROR, "Could not dirty metadata buffer. "
                      "(bh->b_blocknr=%llu)\n",
@@ -432,6 +434,7 @@ int ocfs2_journal_dirty(handle_t *handle,
         return status;
 }
 
+#ifdef CONFIG_OCFS2_COMPAT_JBD
 int ocfs2_journal_dirty_data(handle_t *handle,
                              struct buffer_head *bh)
 {
@@ -443,8 +446,9 @@ int ocfs2_journal_dirty_data(handle_t *handle,
 
         return err;
 }
+#endif
 
-#define OCFS2_DEFAULT_COMMIT_INTERVAL   (HZ * JBD_DEFAULT_MAX_COMMIT_AGE)
+#define OCFS2_DEFAULT_COMMIT_INTERVAL   (HZ * JBD2_DEFAULT_MAX_COMMIT_AGE)
 
 void ocfs2_set_journal_params(struct ocfs2_super *osb)
 {
@@ -457,9 +461,9 @@ void ocfs2_set_journal_params(struct ocfs2_super *osb)
         spin_lock(&journal->j_state_lock);
         journal->j_commit_interval = commit_interval;
         if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
-                journal->j_flags |= JFS_BARRIER;
+                journal->j_flags |= JBD2_BARRIER;
         else
-                journal->j_flags &= ~JFS_BARRIER;
+                journal->j_flags &= ~JBD2_BARRIER;
         spin_unlock(&journal->j_state_lock);
 }
 
@@ -524,14 +528,14 @@ int ocfs2_journal_init(struct ocfs2_journal *journal, int *dirty)
         mlog(0, "inode->ip_clusters = %u\n", OCFS2_I(inode)->ip_clusters);
 
         /* call the kernels journal init function now */
-        j_journal = journal_init_inode(inode);
+        j_journal = jbd2_journal_init_inode(inode);
         if (j_journal == NULL) {
                 mlog(ML_ERROR, "Linux journal layer error\n");
                 status = -EINVAL;
                 goto done;
         }
 
-        mlog(0, "Returned from journal_init_inode\n");
+        mlog(0, "Returned from jbd2_journal_init_inode\n");
         mlog(0, "j_journal->j_maxlen = %u\n", j_journal->j_maxlen);
 
         *dirty = (le32_to_cpu(di->id1.journal1.ij_flags) &
@@ -550,8 +554,7 @@ done:
         if (status < 0) {
                 if (inode_lock)
                         ocfs2_inode_unlock(inode, 1);
-                if (bh != NULL)
-                        brelse(bh);
+                brelse(bh);
                 if (inode) {
                         OCFS2_I(inode)->ip_open_count--;
                         iput(inode);
@@ -639,7 +642,7 @@ void ocfs2_journal_shutdown(struct ocfs2_super *osb)
         if (journal->j_state != OCFS2_JOURNAL_LOADED)
                 goto done;
 
-        /* need to inc inode use count as journal_destroy will iput. */
+        /* need to inc inode use count - jbd2_journal_destroy will iput. */
         if (!igrab(inode))
                 BUG();
 
@@ -668,9 +671,9 @@ void ocfs2_journal_shutdown(struct ocfs2_super *osb)
         BUG_ON(atomic_read(&(osb->journal->j_num_trans)) != 0);
 
         if (ocfs2_mount_local(osb)) {
-                journal_lock_updates(journal->j_journal);
-                status = journal_flush(journal->j_journal);
-                journal_unlock_updates(journal->j_journal);
+                jbd2_journal_lock_updates(journal->j_journal);
+                status = jbd2_journal_flush(journal->j_journal);
+                jbd2_journal_unlock_updates(journal->j_journal);
                 if (status < 0)
                         mlog_errno(status);
         }
@@ -686,7 +689,7 @@ void ocfs2_journal_shutdown(struct ocfs2_super *osb)
         }
 
         /* Shutdown the kernel journal system */
-        journal_destroy(journal->j_journal);
+        jbd2_journal_destroy(journal->j_journal);
 
         OCFS2_I(inode)->ip_open_count--;
 
@@ -711,15 +714,15 @@ static void ocfs2_clear_journal_error(struct super_block *sb,
 {
         int olderr;
 
-        olderr = journal_errno(journal);
+        olderr = jbd2_journal_errno(journal);
         if (olderr) {
                 mlog(ML_ERROR, "File system error %d recorded in "
                      "journal %u.\n", olderr, slot);
                 mlog(ML_ERROR, "File system on device %s needs checking.\n",
                      sb->s_id);
 
-                journal_ack_err(journal);
-                journal_clear_err(journal);
+                jbd2_journal_ack_err(journal);
+                jbd2_journal_clear_err(journal);
         }
 }
 
@@ -734,7 +737,7 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed)
 
         osb = journal->j_osb;
 
-        status = journal_load(journal->j_journal);
+        status = jbd2_journal_load(journal->j_journal);
         if (status < 0) {
                 mlog(ML_ERROR, "Failed to load journal!\n");
                 goto done;
@@ -778,7 +781,7 @@ int ocfs2_journal_wipe(struct ocfs2_journal *journal, int full)
 
         BUG_ON(!journal);
 
-        status = journal_wipe(journal->j_journal, full);
+        status = jbd2_journal_wipe(journal->j_journal, full);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -847,9 +850,8 @@ static int ocfs2_force_read_journal(struct inode *inode)
 
                 /* We are reading journal data which should not
                  * be put in the uptodate cache */
-                status = ocfs2_read_blocks(OCFS2_SB(inode->i_sb),
-                                           p_blkno, p_blocks, bhs, 0,
-                                           NULL);
+                status = ocfs2_read_blocks_sync(OCFS2_SB(inode->i_sb),
+                                                p_blkno, p_blocks, bhs);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
@@ -865,8 +867,7 @@ static int ocfs2_force_read_journal(struct inode *inode)
 
 bail:
         for(i = 0; i < CONCURRENT_JOURNAL_FILL; i++)
-                if (bhs[i])
-                        brelse(bhs[i]);
+                brelse(bhs[i]);
         mlog_exit(status);
         return status;
 }
@@ -1133,7 +1134,8 @@ static int ocfs2_read_journal_inode(struct ocfs2_super *osb,
         }
         SET_INODE_JOURNAL(inode);
 
-        status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, bh, 0, inode);
+        status = ocfs2_read_blocks(inode, OCFS2_I(inode)->ip_blkno, 1, bh,
+                                   OCFS2_BH_IGNORE_CACHE);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -1229,19 +1231,19 @@ static int ocfs2_replay_journal(struct ocfs2_super *osb,
         }
 
         mlog(0, "calling journal_init_inode\n");
-        journal = journal_init_inode(inode);
+        journal = jbd2_journal_init_inode(inode);
         if (journal == NULL) {
                 mlog(ML_ERROR, "Linux journal layer error\n");
                 status = -EIO;
                 goto done;
         }
 
-        status = journal_load(journal);
+        status = jbd2_journal_load(journal);
         if (status < 0) {
                 mlog_errno(status);
                 if (!igrab(inode))
                         BUG();
-                journal_destroy(journal);
+                jbd2_journal_destroy(journal);
                 goto done;
         }
 
@@ -1249,9 +1251,9 @@ static int ocfs2_replay_journal(struct ocfs2_super *osb,
 
         /* wipe the journal */
         mlog(0, "flushing the journal.\n");
-        journal_lock_updates(journal);
-        status = journal_flush(journal);
-        journal_unlock_updates(journal);
+        jbd2_journal_lock_updates(journal);
+        status = jbd2_journal_flush(journal);
+        jbd2_journal_unlock_updates(journal);
         if (status < 0)
                 mlog_errno(status);
 
@@ -1272,7 +1274,7 @@ static int ocfs2_replay_journal(struct ocfs2_super *osb,
         if (!igrab(inode))
                 BUG();
 
-        journal_destroy(journal);
+        jbd2_journal_destroy(journal);
 
 done:
         /* drop the lock on this nodes journal */
@@ -1282,8 +1284,7 @@ done:
         if (inode)
                 iput(inode);
 
-        if (bh)
-                brelse(bh);
+        brelse(bh);
 
         mlog_exit(status);
         return status;
diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
index 2178ebffa05f..d4d14e9a3cea 100644
--- a/fs/ocfs2/journal.h
+++ b/fs/ocfs2/journal.h
@@ -27,7 +27,12 @@
 #define OCFS2_JOURNAL_H
 
 #include <linux/fs.h>
-#include <linux/jbd.h>
+#ifndef CONFIG_OCFS2_COMPAT_JBD
+# include <linux/jbd2.h>
+#else
+# include <linux/jbd.h>
+# include "ocfs2_jbd_compat.h"
+#endif
 
 enum ocfs2_journal_state {
         OCFS2_JOURNAL_FREE = 0,
@@ -215,8 +220,8 @@ static inline void ocfs2_checkpoint_inode(struct inode *inode)
  *                          buffer. Will have to call ocfs2_journal_dirty once
  *                          we've actually dirtied it. Type is one of . or .
  *  ocfs2_journal_dirty    - Mark a journalled buffer as having dirty data.
- *  ocfs2_journal_dirty_data - Indicate that a data buffer should go out before
- *                             the current handle commits.
+ *  ocfs2_jbd2_file_inode  - Mark an inode so that its data goes out before
+ *                           the current handle commits.
  */
 
 /* You must always start_trans with a number of buffs > 0, but it's
@@ -268,8 +273,10 @@ int                  ocfs2_journal_access(handle_t *handle,
  */
 int                  ocfs2_journal_dirty(handle_t *handle,
                                          struct buffer_head *bh);
+#ifdef CONFIG_OCFS2_COMPAT_JBD
 int                  ocfs2_journal_dirty_data(handle_t *handle,
                                               struct buffer_head *bh);
+#endif
 
 /*
  *  Credit Macros:
@@ -283,6 +290,9 @@ int                  ocfs2_journal_dirty_data(handle_t *handle,
 /* simple file updates like chmod, etc. */
 #define OCFS2_INODE_UPDATE_CREDITS 1
 
+/* extended attribute block update */
+#define OCFS2_XATTR_BLOCK_UPDATE_CREDITS 1
+
 /* group extend. inode update and last group update. */
 #define OCFS2_GROUP_EXTEND_CREDITS      (OCFS2_INODE_UPDATE_CREDITS + 1)
 
@@ -340,11 +350,23 @@ int                  ocfs2_journal_dirty_data(handle_t *handle,
 #define OCFS2_RENAME_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 3              \
                              + OCFS2_UNLINK_CREDITS)
 
+/* global bitmap dinode, group desc., relinked group,
+ * suballocator dinode, group desc., relinked group,
+ * dinode, xattr block */
+#define OCFS2_XATTR_BLOCK_CREATE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + \
+                                          + OCFS2_INODE_UPDATE_CREDITS \
+                                          + OCFS2_XATTR_BLOCK_UPDATE_CREDITS)
+
+/*
+ * Please note that the caller must make sure that root_el is the root
+ * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
+ * the result may be wrong.
+ */
 static inline int ocfs2_calc_extend_credits(struct super_block *sb,
-                                            struct ocfs2_dinode *fe,
+                                            struct ocfs2_extent_list *root_el,
                                             u32 bits_wanted)
 {
-        int bitmap_blocks, sysfile_bitmap_blocks, dinode_blocks;
+        int bitmap_blocks, sysfile_bitmap_blocks, extent_blocks;
 
         /* bitmap dinode, group desc. + relinked group. */
         bitmap_blocks = OCFS2_SUBALLOC_ALLOC;
@@ -355,16 +377,16 @@ static inline int ocfs2_calc_extend_credits(struct super_block *sb,
          * however many metadata chunks needed * a remaining suballoc
          * alloc. */
         sysfile_bitmap_blocks = 1 +
-                (OCFS2_SUBALLOC_ALLOC - 1) * ocfs2_extend_meta_needed(fe);
+                (OCFS2_SUBALLOC_ALLOC - 1) * ocfs2_extend_meta_needed(root_el);
 
         /* this does not include *new* metadata blocks, which are
-         * accounted for in sysfile_bitmap_blocks. fe +
+         * accounted for in sysfile_bitmap_blocks. root_el +
          * prev. last_eb_blk + blocks along edge of tree.
          * calc_symlink_credits passes because we just need 1
          * credit for the dinode there. */
-        dinode_blocks = 1 + 1 + le16_to_cpu(fe->id2.i_list.l_tree_depth);
+        extent_blocks = 1 + 1 + le16_to_cpu(root_el->l_tree_depth);
 
-        return bitmap_blocks + sysfile_bitmap_blocks + dinode_blocks;
+        return bitmap_blocks + sysfile_bitmap_blocks + extent_blocks;
 }
 
 static inline int ocfs2_calc_symlink_credits(struct super_block *sb)
@@ -415,4 +437,16 @@ static inline int ocfs2_calc_tree_trunc_credits(struct super_block *sb,
         return credits;
 }
 
+static inline int ocfs2_jbd2_file_inode(handle_t *handle, struct inode *inode)
+{
+        return jbd2_journal_file_inode(handle, &OCFS2_I(inode)->ip_jinode);
+}
+
+static inline int ocfs2_begin_ordered_truncate(struct inode *inode,
+                                               loff_t new_size)
+{
+        return jbd2_journal_begin_ordered_truncate(&OCFS2_I(inode)->ip_jinode,
+                                                   new_size);
+}
+
 #endif /* OCFS2_JOURNAL_H */
diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index 28e492e4ec88..687b28713c32 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -28,6 +28,7 @@
 #include <linux/slab.h>
 #include <linux/highmem.h>
 #include <linux/bitops.h>
+#include <linux/debugfs.h>
 
 #define MLOG_MASK_PREFIX ML_DISK_ALLOC
 #include <cluster/masklog.h>
@@ -47,8 +48,6 @@
 
 #define OCFS2_LOCAL_ALLOC(dinode)       (&((dinode)->id2.i_lab))
 
-static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb);
-
 static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
 
 static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
@@ -75,24 +74,129 @@ static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
                                           struct inode *local_alloc_inode);
 
-static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb)
+#ifdef CONFIG_OCFS2_FS_STATS
+
+static int ocfs2_la_debug_open(struct inode *inode, struct file *file)
+{
+        file->private_data = inode->i_private;
+        return 0;
+}
+
+#define LA_DEBUG_BUF_SZ PAGE_CACHE_SIZE
+#define LA_DEBUG_VER    1
+static ssize_t ocfs2_la_debug_read(struct file *file, char __user *userbuf,
+                                   size_t count, loff_t *ppos)
+{
+        static DEFINE_MUTEX(la_debug_mutex);
+        struct ocfs2_super *osb = file->private_data;
+        int written, ret;
+        char *buf = osb->local_alloc_debug_buf;
+
+        mutex_lock(&la_debug_mutex);
+        memset(buf, 0, LA_DEBUG_BUF_SZ);
+
+        written = snprintf(buf, LA_DEBUG_BUF_SZ,
+                           "0x%x\t0x%llx\t%u\t%u\t0x%x\n",
+                           LA_DEBUG_VER,
+                           (unsigned long long)osb->la_last_gd,
+                           osb->local_alloc_default_bits,
+                           osb->local_alloc_bits, osb->local_alloc_state);
+
+        ret = simple_read_from_buffer(userbuf, count, ppos, buf, written);
+
+        mutex_unlock(&la_debug_mutex);
+        return ret;
+}
+
+static const struct file_operations ocfs2_la_debug_fops = {
+        .open =         ocfs2_la_debug_open,
+        .read =         ocfs2_la_debug_read,
+};
+
+static void ocfs2_init_la_debug(struct ocfs2_super *osb)
+{
+        osb->local_alloc_debug_buf = kmalloc(LA_DEBUG_BUF_SZ, GFP_NOFS);
+        if (!osb->local_alloc_debug_buf)
+                return;
+
+        osb->local_alloc_debug = debugfs_create_file("local_alloc_stats",
+                                                     S_IFREG|S_IRUSR,
+                                                     osb->osb_debug_root,
+                                                     osb,
+                                                     &ocfs2_la_debug_fops);
+        if (!osb->local_alloc_debug) {
+                kfree(osb->local_alloc_debug_buf);
+                osb->local_alloc_debug_buf = NULL;
+        }
+}
+
+static void ocfs2_shutdown_la_debug(struct ocfs2_super *osb)
+{
+        if (osb->local_alloc_debug)
+                debugfs_remove(osb->local_alloc_debug);
+
+        if (osb->local_alloc_debug_buf)
+                kfree(osb->local_alloc_debug_buf);
+
+        osb->local_alloc_debug_buf = NULL;
+        osb->local_alloc_debug = NULL;
+}
+#else   /* CONFIG_OCFS2_FS_STATS */
+static void ocfs2_init_la_debug(struct ocfs2_super *osb)
+{
+        return;
+}
+static void ocfs2_shutdown_la_debug(struct ocfs2_super *osb)
+{
+        return;
+}
+#endif
+
+static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
 {
-        BUG_ON(osb->s_clustersize_bits > 20);
+        return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
+                osb->local_alloc_state == OCFS2_LA_ENABLED);
+}
 
-        /* Size local alloc windows by the megabyte */
-        return osb->local_alloc_size << (20 - osb->s_clustersize_bits);
+void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
+                                      unsigned int num_clusters)
+{
+        spin_lock(&osb->osb_lock);
+        if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
+            osb->local_alloc_state == OCFS2_LA_THROTTLED)
+                if (num_clusters >= osb->local_alloc_default_bits) {
+                        cancel_delayed_work(&osb->la_enable_wq);
+                        osb->local_alloc_state = OCFS2_LA_ENABLED;
+                }
+        spin_unlock(&osb->osb_lock);
+}
+
+void ocfs2_la_enable_worker(struct work_struct *work)
+{
+        struct ocfs2_super *osb =
+                container_of(work, struct ocfs2_super,
+                             la_enable_wq.work);
+        spin_lock(&osb->osb_lock);
+        osb->local_alloc_state = OCFS2_LA_ENABLED;
+        spin_unlock(&osb->osb_lock);
 }
 
 /*
  * Tell us whether a given allocation should use the local alloc
  * file. Otherwise, it has to go to the main bitmap.
+ *
+ * This function does semi-dirty reads of local alloc size and state!
+ * This is ok however, as the values are re-checked once under mutex.
  */
 int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
 {
-        int la_bits = ocfs2_local_alloc_window_bits(osb);
         int ret = 0;
+        int la_bits;
+
+        spin_lock(&osb->osb_lock);
+        la_bits = osb->local_alloc_bits;
 
-        if (osb->local_alloc_state != OCFS2_LA_ENABLED)
+        if (!ocfs2_la_state_enabled(osb))
                 goto bail;
 
         /* la_bits should be at least twice the size (in clusters) of
@@ -106,6 +210,7 @@ int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
 bail:
         mlog(0, "state=%d, bits=%llu, la_bits=%d, ret=%d\n",
              osb->local_alloc_state, (unsigned long long)bits, la_bits, ret);
+        spin_unlock(&osb->osb_lock);
         return ret;
 }
 
@@ -120,14 +225,18 @@ int ocfs2_load_local_alloc(struct ocfs2_super *osb)
 
         mlog_entry_void();
 
-        if (osb->local_alloc_size == 0)
+        ocfs2_init_la_debug(osb);
+
+        if (osb->local_alloc_bits == 0)
                 goto bail;
 
-        if (ocfs2_local_alloc_window_bits(osb) >= osb->bitmap_cpg) {
+        if (osb->local_alloc_bits >= osb->bitmap_cpg) {
                 mlog(ML_NOTICE, "Requested local alloc window %d is larger "
                      "than max possible %u. Using defaults.\n",
-                     ocfs2_local_alloc_window_bits(osb), (osb->bitmap_cpg - 1));
-                osb->local_alloc_size = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
+                     osb->local_alloc_bits, (osb->bitmap_cpg - 1));
+                osb->local_alloc_bits =
+                        ocfs2_megabytes_to_clusters(osb->sb,
+                                                    OCFS2_DEFAULT_LOCAL_ALLOC_SIZE);
         }
 
         /* read the alloc off disk */
@@ -139,8 +248,8 @@ int ocfs2_load_local_alloc(struct ocfs2_super *osb)
                 goto bail;
         }
 
-        status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno,
-                                  &alloc_bh, 0, inode);
+        status = ocfs2_read_blocks(inode, OCFS2_I(inode)->ip_blkno, 1,
+                                   &alloc_bh, OCFS2_BH_IGNORE_CACHE);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -185,13 +294,14 @@ int ocfs2_load_local_alloc(struct ocfs2_super *osb)
 
 bail:
         if (status < 0)
-                if (alloc_bh)
-                        brelse(alloc_bh);
+                brelse(alloc_bh);
         if (inode)
                 iput(inode);
 
-        mlog(0, "Local alloc window bits = %d\n",
-             ocfs2_local_alloc_window_bits(osb));
+        if (status < 0)
+                ocfs2_shutdown_la_debug(osb);
+
+        mlog(0, "Local alloc window bits = %d\n", osb->local_alloc_bits);
 
         mlog_exit(status);
         return status;
@@ -217,6 +327,11 @@ void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
 
         mlog_entry_void();
 
+        cancel_delayed_work(&osb->la_enable_wq);
+        flush_workqueue(ocfs2_wq);
+
+        ocfs2_shutdown_la_debug(osb);
+
         if (osb->local_alloc_state == OCFS2_LA_UNUSED)
                 goto out;
 
@@ -295,8 +410,7 @@ out_commit:
         ocfs2_commit_trans(osb, handle);
 
 out_unlock:
-        if (main_bm_bh)
-                brelse(main_bm_bh);
+        brelse(main_bm_bh);
 
         ocfs2_inode_unlock(main_bm_inode, 1);
 
@@ -345,8 +459,8 @@ int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
 
         mutex_lock(&inode->i_mutex);
 
-        status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno,
-                                  &alloc_bh, 0, inode);
+        status = ocfs2_read_blocks(inode, OCFS2_I(inode)->ip_blkno, 1,
+                                   &alloc_bh, OCFS2_BH_IGNORE_CACHE);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -372,8 +486,7 @@ bail:
                 *alloc_copy = NULL;
         }
 
-        if (alloc_bh)
-                brelse(alloc_bh);
+        brelse(alloc_bh);
 
         if (inode) {
                 mutex_unlock(&inode->i_mutex);
@@ -441,8 +554,7 @@ out_unlock:
 out_mutex:
         mutex_unlock(&main_bm_inode->i_mutex);
 
-        if (main_bm_bh)
-                brelse(main_bm_bh);
+        brelse(main_bm_bh);
 
         iput(main_bm_inode);
 
@@ -453,8 +565,48 @@ out:
         return status;
 }
 
+/* Check to see if the local alloc window is within ac->ac_max_block */
+static int ocfs2_local_alloc_in_range(struct inode *inode,
+                                      struct ocfs2_alloc_context *ac,
+                                      u32 bits_wanted)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_dinode *alloc;
+        struct ocfs2_local_alloc *la;
+        int start;
+        u64 block_off;
+
+        if (!ac->ac_max_block)
+                return 1;
+
+        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
+        la = OCFS2_LOCAL_ALLOC(alloc);
+
+        start = ocfs2_local_alloc_find_clear_bits(osb, alloc, bits_wanted);
+        if (start == -1) {
+                mlog_errno(-ENOSPC);
+                return 0;
+        }
+
+        /*
+         * Converting (bm_off + start + bits_wanted) to blocks gives us
+         * the blkno just past our actual allocation.  This is perfect
+         * to compare with ac_max_block.
+         */
+        block_off = ocfs2_clusters_to_blocks(inode->i_sb,
+                                             le32_to_cpu(la->la_bm_off) +
+                                             start + bits_wanted);
+        mlog(0, "Checking %llu against %llu\n",
+             (unsigned long long)block_off,
+             (unsigned long long)ac->ac_max_block);
+        if (block_off > ac->ac_max_block)
+                return 0;
+
+        return 1;
+}
+
 /*
- * make sure we've got at least bitswanted contiguous bits in the
+ * make sure we've got at least bits_wanted contiguous bits in the
  * local alloc. You lose them when you drop i_mutex.
  *
  * We will add ourselves to the transaction passed in, but may start
@@ -485,16 +637,18 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
 
         mutex_lock(&local_alloc_inode->i_mutex);
 
-        if (osb->local_alloc_state != OCFS2_LA_ENABLED) {
-                status = -ENOSPC;
-                goto bail;
-        }
-
-        if (bits_wanted > ocfs2_local_alloc_window_bits(osb)) {
-                mlog(0, "Asking for more than my max window size!\n");
+        /*
+         * We must double check state and allocator bits because
+         * another process may have changed them while holding i_mutex.
+         */
+        spin_lock(&osb->osb_lock);
+        if (!ocfs2_la_state_enabled(osb) ||
+            (bits_wanted > osb->local_alloc_bits)) {
+                spin_unlock(&osb->osb_lock);
                 status = -ENOSPC;
                 goto bail;
         }
+        spin_unlock(&osb->osb_lock);
 
         alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
 
@@ -522,6 +676,36 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
                                 mlog_errno(status);
                         goto bail;
                 }
+
+                /*
+                 * Under certain conditions, the window slide code
+                 * might have reduced the number of bits available or
+                 * disabled the the local alloc entirely. Re-check
+                 * here and return -ENOSPC if necessary.
+                 */
+                status = -ENOSPC;
+                if (!ocfs2_la_state_enabled(osb))
+                        goto bail;
+
+                free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
+                        le32_to_cpu(alloc->id1.bitmap1.i_used);
+                if (bits_wanted > free_bits)
+                        goto bail;
+        }
+
+        if (ac->ac_max_block)
+                mlog(0, "Calling in_range for max block %llu\n",
+                     (unsigned long long)ac->ac_max_block);
+
+        if (!ocfs2_local_alloc_in_range(local_alloc_inode, ac,
+                                        bits_wanted)) {
+                /*
+                 * The window is outside ac->ac_max_block.
+                 * This errno tells the caller to keep localalloc enabled
+                 * but to get the allocation from the main bitmap.
+                 */
+                status = -EFBIG;
+                goto bail;
         }
 
         ac->ac_inode = local_alloc_inode;
@@ -789,6 +973,85 @@ bail:
         return status;
 }
 
+enum ocfs2_la_event {
+        OCFS2_LA_EVENT_SLIDE,           /* Normal window slide. */
+        OCFS2_LA_EVENT_FRAGMENTED,      /* The global bitmap has
+                                         * enough bits theoretically
+                                         * free, but a contiguous
+                                         * allocation could not be
+                                         * found. */
+        OCFS2_LA_EVENT_ENOSPC,          /* Global bitmap doesn't have
+                                         * enough bits free to satisfy
+                                         * our request. */
+};
+#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
+/*
+ * Given an event, calculate the size of our next local alloc window.
+ *
+ * This should always be called under i_mutex of the local alloc inode
+ * so that local alloc disabling doesn't race with processes trying to
+ * use the allocator.
+ *
+ * Returns the state which the local alloc was left in. This value can
+ * be ignored by some paths.
+ */
+static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
+                                  enum ocfs2_la_event event)
+{
+        unsigned int bits;
+        int state;
+
+        spin_lock(&osb->osb_lock);
+        if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
+                WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
+                goto out_unlock;
+        }
+
+        /*
+         * ENOSPC and fragmentation are treated similarly for now.
+         */
+        if (event == OCFS2_LA_EVENT_ENOSPC ||
+            event == OCFS2_LA_EVENT_FRAGMENTED) {
+                /*
+                 * We ran out of contiguous space in the primary
+                 * bitmap. Drastically reduce the number of bits used
+                 * by local alloc until we have to disable it.
+                 */
+                bits = osb->local_alloc_bits >> 1;
+                if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
+                        /*
+                         * By setting state to THROTTLED, we'll keep
+                         * the number of local alloc bits used down
+                         * until an event occurs which would give us
+                         * reason to assume the bitmap situation might
+                         * have changed.
+                         */
+                        osb->local_alloc_state = OCFS2_LA_THROTTLED;
+                        osb->local_alloc_bits = bits;
+                } else {
+                        osb->local_alloc_state = OCFS2_LA_DISABLED;
+                }
+                queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
+                                   OCFS2_LA_ENABLE_INTERVAL);
+                goto out_unlock;
+        }
+
+        /*
+         * Don't increase the size of the local alloc window until we
+         * know we might be able to fulfill the request. Otherwise, we
+         * risk bouncing around the global bitmap during periods of
+         * low space.
+         */
+        if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
+                osb->local_alloc_bits = osb->local_alloc_default_bits;
+
+out_unlock:
+        state = osb->local_alloc_state;
+        spin_unlock(&osb->osb_lock);
+
+        return state;
+}
+
 static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
                                                 struct ocfs2_alloc_context **ac,
                                                 struct inode **bitmap_inode,
@@ -803,12 +1066,21 @@ static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
                 goto bail;
         }
 
-        (*ac)->ac_bits_wanted = ocfs2_local_alloc_window_bits(osb);
+retry_enospc:
+        (*ac)->ac_bits_wanted = osb->local_alloc_bits;
 
         status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
+        if (status == -ENOSPC) {
+                if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
+                    OCFS2_LA_DISABLED)
+                        goto bail;
+
+                ocfs2_free_ac_resource(*ac);
+                memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
+                goto retry_enospc;
+        }
         if (status < 0) {
-                if (status != -ENOSPC)
-                        mlog_errno(status);
+                mlog_errno(status);
                 goto bail;
         }
 
@@ -849,7 +1121,7 @@ static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
                      "one\n");
 
         mlog(0, "Allocating %u clusters for a new window.\n",
-             ocfs2_local_alloc_window_bits(osb));
+             osb->local_alloc_bits);
 
         /* Instruct the allocation code to try the most recently used
          * cluster group. We'll re-record the group used this pass
@@ -859,9 +1131,36 @@ static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
         /* we used the generic suballoc reserve function, but we set
          * everything up nicely, so there's no reason why we can't use
          * the more specific cluster api to claim bits. */
-        status = ocfs2_claim_clusters(osb, handle, ac,
-                                      ocfs2_local_alloc_window_bits(osb),
+        status = ocfs2_claim_clusters(osb, handle, ac, osb->local_alloc_bits,
                                       &cluster_off, &cluster_count);
+        if (status == -ENOSPC) {
+retry_enospc:
+                /*
+                 * Note: We could also try syncing the journal here to
+                 * allow use of any free bits which the current
+                 * transaction can't give us access to. --Mark
+                 */
+                if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
+                    OCFS2_LA_DISABLED)
+                        goto bail;
+
+                status = ocfs2_claim_clusters(osb, handle, ac,
+                                              osb->local_alloc_bits,
+                                              &cluster_off,
+                                              &cluster_count);
+                if (status == -ENOSPC)
+                        goto retry_enospc;
+                /*
+                 * We only shrunk the *minimum* number of in our
+                 * request - it's entirely possible that the allocator
+                 * might give us more than we asked for.
+                 */
+                if (status == 0) {
+                        spin_lock(&osb->osb_lock);
+                        osb->local_alloc_bits = cluster_count;
+                        spin_unlock(&osb->osb_lock);
+                }
+        }
         if (status < 0) {
                 if (status != -ENOSPC)
                         mlog_errno(status);
@@ -905,6 +1204,8 @@ static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
 
         mlog_entry_void();
 
+        ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
+
         /* This will lock the main bitmap for us. */
         status = ocfs2_local_alloc_reserve_for_window(osb,
                                                       &ac,
@@ -976,8 +1277,7 @@ bail:
         if (handle)
                 ocfs2_commit_trans(osb, handle);
 
-        if (main_bm_bh)
-                brelse(main_bm_bh);
+        brelse(main_bm_bh);
 
         if (main_bm_inode)
                 iput(main_bm_inode);
diff --git a/fs/ocfs2/localalloc.h b/fs/ocfs2/localalloc.h
index 3f76631e110c..ac5ea9f86653 100644
--- a/fs/ocfs2/localalloc.h
+++ b/fs/ocfs2/localalloc.h
@@ -52,4 +52,8 @@ int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
                                  u32 *bit_off,
                                  u32 *num_bits);
 
+void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
+                                      unsigned int num_clusters);
+void ocfs2_la_enable_worker(struct work_struct *work);
+
 #endif /* OCFS2_LOCALALLOC_H */
diff --git a/fs/ocfs2/locks.c b/fs/ocfs2/locks.c
index 203f87143877..544ac6245175 100644
--- a/fs/ocfs2/locks.c
+++ b/fs/ocfs2/locks.c
@@ -24,6 +24,7 @@
  */
 
 #include <linux/fs.h>
+#include <linux/fcntl.h>
 
 #define MLOG_MASK_PREFIX ML_INODE
 #include <cluster/masklog.h>
@@ -32,6 +33,7 @@
 
 #include "dlmglue.h"
 #include "file.h"
+#include "inode.h"
 #include "locks.h"
 
 static int ocfs2_do_flock(struct file *file, struct inode *inode,
@@ -123,3 +125,16 @@ int ocfs2_flock(struct file *file, int cmd, struct file_lock *fl)
         else
                 return ocfs2_do_flock(file, inode, cmd, fl);
 }
+
+int ocfs2_lock(struct file *file, int cmd, struct file_lock *fl)
+{
+        struct inode *inode = file->f_mapping->host;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        if (!(fl->fl_flags & FL_POSIX))
+                return -ENOLCK;
+        if (__mandatory_lock(inode))
+                return -ENOLCK;
+
+        return ocfs2_plock(osb->cconn, OCFS2_I(inode)->ip_blkno, file, cmd, fl);
+}
diff --git a/fs/ocfs2/locks.h b/fs/ocfs2/locks.h
index 9743ef2324ec..496d488b271f 100644
--- a/fs/ocfs2/locks.h
+++ b/fs/ocfs2/locks.h
@@ -27,5 +27,6 @@
 #define OCFS2_LOCKS_H
 
 int ocfs2_flock(struct file *file, int cmd, struct file_lock *fl);
+int ocfs2_lock(struct file *file, int cmd, struct file_lock *fl);
 
 #endif /* OCFS2_LOCKS_H */
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index d5d808fe0140..485a6aa0ad39 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -60,6 +60,7 @@
 #include "symlink.h"
 #include "sysfile.h"
 #include "uptodate.h"
+#include "xattr.h"
 
 #include "buffer_head_io.h"
 
@@ -327,14 +328,9 @@ leave:
         if (status == -ENOSPC)
                 mlog(0, "Disk is full\n");
 
-        if (new_fe_bh)
-                brelse(new_fe_bh);
-
-        if (de_bh)
-                brelse(de_bh);
-
-        if (parent_fe_bh)
-                brelse(parent_fe_bh);
+        brelse(new_fe_bh);
+        brelse(de_bh);
+        brelse(parent_fe_bh);
 
         if ((status < 0) && inode)
                 iput(inode);
@@ -647,12 +643,9 @@ out_unlock_inode:
 out:
         ocfs2_inode_unlock(dir, 1);
 
-        if (de_bh)
-                brelse(de_bh);
-        if (fe_bh)
-                brelse(fe_bh);
-        if (parent_fe_bh)
-                brelse(parent_fe_bh);
+        brelse(de_bh);
+        brelse(fe_bh);
+        brelse(parent_fe_bh);
 
         mlog_exit(err);
 
@@ -851,17 +844,10 @@ leave:
                 iput(orphan_dir);
         }
 
-        if (fe_bh)
-                brelse(fe_bh);
-
-        if (dirent_bh)
-                brelse(dirent_bh);
-
-        if (parent_node_bh)
-                brelse(parent_node_bh);
-
-        if (orphan_entry_bh)
-                brelse(orphan_entry_bh);
+        brelse(fe_bh);
+        brelse(dirent_bh);
+        brelse(parent_node_bh);
+        brelse(orphan_entry_bh);
 
         mlog_exit(status);
 
@@ -1372,24 +1358,15 @@ bail:
 
         if (new_inode)
                 iput(new_inode);
-        if (newfe_bh)
-                brelse(newfe_bh);
-        if (old_inode_bh)
-                brelse(old_inode_bh);
-        if (old_dir_bh)
-                brelse(old_dir_bh);
-        if (new_dir_bh)
-                brelse(new_dir_bh);
-        if (new_de_bh)
-                brelse(new_de_bh);
-        if (old_de_bh)
-                brelse(old_de_bh);
-        if (old_inode_de_bh)
-                brelse(old_inode_de_bh);
-        if (orphan_entry_bh)
-                brelse(orphan_entry_bh);
-        if (insert_entry_bh)
-                brelse(insert_entry_bh);
+        brelse(newfe_bh);
+        brelse(old_inode_bh);
+        brelse(old_dir_bh);
+        brelse(new_dir_bh);
+        brelse(new_de_bh);
+        brelse(old_de_bh);
+        brelse(old_inode_de_bh);
+        brelse(orphan_entry_bh);
+        brelse(insert_entry_bh);
 
         mlog_exit(status);
 
@@ -1492,8 +1469,7 @@ bail:
 
         if (bhs) {
                 for(i = 0; i < blocks; i++)
-                        if (bhs[i])
-                                brelse(bhs[i]);
+                        brelse(bhs[i]);
                 kfree(bhs);
         }
 
@@ -1598,10 +1574,10 @@ static int ocfs2_symlink(struct inode *dir,
                 u32 offset = 0;
 
                 inode->i_op = &ocfs2_symlink_inode_operations;
-                status = ocfs2_do_extend_allocation(osb, inode, &offset, 1, 0,
-                                                    new_fe_bh,
-                                                    handle, data_ac, NULL,
-                                                    NULL);
+                status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
+                                              new_fe_bh,
+                                              handle, data_ac, NULL,
+                                              NULL);
                 if (status < 0) {
                         if (status != -ENOSPC && status != -EINTR) {
                                 mlog(ML_ERROR,
@@ -1659,12 +1635,9 @@ bail:
 
         ocfs2_inode_unlock(dir, 1);
 
-        if (new_fe_bh)
-                brelse(new_fe_bh);
-        if (parent_fe_bh)
-                brelse(parent_fe_bh);
-        if (de_bh)
-                brelse(de_bh);
+        brelse(new_fe_bh);
+        brelse(parent_fe_bh);
+        brelse(de_bh);
         if (inode_ac)
                 ocfs2_free_alloc_context(inode_ac);
         if (data_ac)
@@ -1759,8 +1732,7 @@ leave:
                 iput(orphan_dir_inode);
         }
 
-        if (orphan_dir_bh)
-                brelse(orphan_dir_bh);
+        brelse(orphan_dir_bh);
 
         mlog_exit(status);
         return status;
@@ -1780,10 +1752,9 @@ static int ocfs2_orphan_add(struct ocfs2_super *osb,
 
         mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
 
-        status = ocfs2_read_block(osb,
+        status = ocfs2_read_block(orphan_dir_inode,
                                   OCFS2_I(orphan_dir_inode)->ip_blkno,
-                                  &orphan_dir_bh, OCFS2_BH_CACHED,
-                                  orphan_dir_inode);
+                                  &orphan_dir_bh);
         if (status < 0) {
                 mlog_errno(status);
                 goto leave;
@@ -1829,8 +1800,7 @@ static int ocfs2_orphan_add(struct ocfs2_super *osb,
              (unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
 
 leave:
-        if (orphan_dir_bh)
-                brelse(orphan_dir_bh);
+        brelse(orphan_dir_bh);
 
         mlog_exit(status);
         return status;
@@ -1898,8 +1868,7 @@ int ocfs2_orphan_del(struct ocfs2_super *osb,
         }
 
 leave:
-        if (target_de_bh)
-                brelse(target_de_bh);
+        brelse(target_de_bh);
 
         mlog_exit(status);
         return status;
@@ -1918,4 +1887,8 @@ const struct inode_operations ocfs2_dir_iops = {
         .setattr        = ocfs2_setattr,
         .getattr        = ocfs2_getattr,
         .permission     = ocfs2_permission,
+        .setxattr       = generic_setxattr,
+        .getxattr       = generic_getxattr,
+        .listxattr      = ocfs2_listxattr,
+        .removexattr    = generic_removexattr,
 };
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 7f625f2b1117..a21a465490c4 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -34,7 +34,12 @@
 #include <linux/workqueue.h>
 #include <linux/kref.h>
 #include <linux/mutex.h>
-#include <linux/jbd.h>
+#ifndef CONFIG_OCFS2_COMPAT_JBD
+# include <linux/jbd2.h>
+#else
+# include <linux/jbd.h>
+# include "ocfs2_jbd_compat.h"
+#endif
 
 /* For union ocfs2_dlm_lksb */
 #include "stackglue.h"
@@ -171,9 +176,13 @@ struct ocfs2_alloc_stats
 
 enum ocfs2_local_alloc_state
 {
-        OCFS2_LA_UNUSED = 0,
-        OCFS2_LA_ENABLED,
-        OCFS2_LA_DISABLED
+        OCFS2_LA_UNUSED = 0,    /* Local alloc will never be used for
+                                 * this mountpoint. */
+        OCFS2_LA_ENABLED,       /* Local alloc is in use. */
+        OCFS2_LA_THROTTLED,     /* Local alloc is in use, but number
+                                 * of bits has been reduced. */
+        OCFS2_LA_DISABLED       /* Local alloc has temporarily been
+                                 * disabled. */
 };
 
 enum ocfs2_mount_options
@@ -184,6 +193,8 @@ enum ocfs2_mount_options
         OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
         OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
         OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
+        OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
+        OCFS2_MOUNT_INODE64 = 1 << 7,   /* Allow inode numbers > 2^32 */
 };
 
 #define OCFS2_OSB_SOFT_RO       0x0001
@@ -214,6 +225,7 @@ struct ocfs2_super
         u32 bitmap_cpg;
         u8 *uuid;
         char *uuid_str;
+        u32 uuid_hash;
         u8 *vol_label;
         u64 first_cluster_group_blkno;
         u32 fs_generation;
@@ -241,6 +253,7 @@ struct ocfs2_super
         int s_sectsize_bits;
         int s_clustersize;
         int s_clustersize_bits;
+        unsigned int s_xattr_inline_size;
 
         atomic_t vol_state;
         struct mutex recovery_lock;
@@ -252,11 +265,27 @@ struct ocfs2_super
         struct ocfs2_journal *journal;
         unsigned long osb_commit_interval;
 
-        int local_alloc_size;
-        enum ocfs2_local_alloc_state local_alloc_state;
+        struct delayed_work             la_enable_wq;
+
+        /*
+         * Must hold local alloc i_mutex and osb->osb_lock to change
+         * local_alloc_bits. Reads can be done under either lock.
+         */
+        unsigned int local_alloc_bits;
+        unsigned int local_alloc_default_bits;
+
+        enum ocfs2_local_alloc_state local_alloc_state; /* protected
+                                                         * by osb_lock */
+
         struct buffer_head *local_alloc_bh;
+
         u64 la_last_gd;
 
+#ifdef CONFIG_OCFS2_FS_STATS
+        struct dentry *local_alloc_debug;
+        char *local_alloc_debug_buf;
+#endif
+
         /* Next two fields are for local node slot recovery during
          * mount. */
         int dirty;
@@ -340,6 +369,13 @@ static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
         return 0;
 }
 
+static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
+{
+        if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
+                return 1;
+        return 0;
+}
+
 /* set / clear functions because cluster events can make these happen
  * in parallel so we want the transitions to be atomic. this also
  * means that any future flags osb_flags must be protected by spinlock
@@ -554,6 +590,14 @@ static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
         return pages_per_cluster;
 }
 
+static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
+                                                       unsigned int megs)
+{
+        BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
+
+        return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
+}
+
 static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
 {
         spin_lock(&osb->osb_lock);
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index 4f619850ccf7..f24ce3d3f956 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -64,6 +64,7 @@
 #define OCFS2_INODE_SIGNATURE           "INODE01"
 #define OCFS2_EXTENT_BLOCK_SIGNATURE    "EXBLK01"
 #define OCFS2_GROUP_DESC_SIGNATURE      "GROUP01"
+#define OCFS2_XATTR_BLOCK_SIGNATURE     "XATTR01"
 
 /* Compatibility flags */
 #define OCFS2_HAS_COMPAT_FEATURE(sb,mask)                       \
@@ -90,7 +91,8 @@
                                          | OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
                                          | OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
                                          | OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
-                                         | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK)
+                                         | OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
+                                         | OCFS2_FEATURE_INCOMPAT_XATTR)
 #define OCFS2_FEATURE_RO_COMPAT_SUPP    OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
 
 /*
@@ -127,10 +129,6 @@
 /* Support for data packed into inode blocks */
 #define OCFS2_FEATURE_INCOMPAT_INLINE_DATA      0x0040
 
-/* Support for the extended slot map */
-#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
-
-
 /*
  * Support for alternate, userspace cluster stacks.  If set, the superblock
  * field s_cluster_info contains a tag for the alternate stack in use as
@@ -142,6 +140,12 @@
  */
 #define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK  0x0080
 
+/* Support for the extended slot map */
+#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
+
+/* Support for extended attributes */
+#define OCFS2_FEATURE_INCOMPAT_XATTR            0x0200
+
 /*
  * backup superblock flag is used to indicate that this volume
  * has backup superblocks.
@@ -299,6 +303,12 @@ struct ocfs2_new_group_input {
  */
 #define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE  8
 
+/*
+ * Inline extended attribute size (in bytes)
+ * The value chosen should be aligned to 16 byte boundaries.
+ */
+#define OCFS2_MIN_XATTR_INLINE_SIZE     256
+
 struct ocfs2_system_inode_info {
         char    *si_name;
         int     si_iflags;
@@ -563,7 +573,7 @@ struct ocfs2_super_block {
 /*40*/  __le16 s_max_slots;             /* Max number of simultaneous mounts
                                            before tunefs required */
         __le16 s_tunefs_flag;
-        __le32 s_reserved1;
+        __le32 s_uuid_hash;             /* hash value of uuid */
         __le64 s_first_cluster_group;   /* Block offset of 1st cluster
                                          * group header */
 /*50*/  __u8  s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
@@ -571,7 +581,11 @@ struct ocfs2_super_block {
 /*A0*/  struct ocfs2_cluster_info s_cluster_info; /* Selected userspace
                                                      stack.  Only valid
                                                      with INCOMPAT flag. */
-/*B8*/  __le64 s_reserved2[17];         /* Fill out superblock */
+/*B8*/  __le16 s_xattr_inline_size;     /* extended attribute inline size
+                                           for this fs*/
+        __le16 s_reserved0;
+        __le32 s_reserved1;
+/*C0*/  __le64 s_reserved2[16];         /* Fill out superblock */
 /*140*/
 
         /*
@@ -621,7 +635,8 @@ struct ocfs2_dinode {
                                            belongs to */
         __le16 i_suballoc_bit;          /* Bit offset in suballocator
                                            block group */
-/*10*/  __le32 i_reserved0;
+/*10*/  __le16 i_reserved0;
+        __le16 i_xattr_inline_size;
         __le32 i_clusters;              /* Cluster count */
         __le32 i_uid;                   /* Owner UID */
         __le32 i_gid;                   /* Owning GID */
@@ -640,11 +655,12 @@ struct ocfs2_dinode {
         __le32 i_atime_nsec;
         __le32 i_ctime_nsec;
         __le32 i_mtime_nsec;
-        __le32 i_attr;
+/*70*/  __le32 i_attr;
         __le16 i_orphaned_slot;         /* Only valid when OCFS2_ORPHANED_FL
                                            was set in i_flags */
         __le16 i_dyn_features;
-/*70*/  __le64 i_reserved2[8];
+        __le64 i_xattr_loc;
+/*80*/  __le64 i_reserved2[7];
 /*B8*/  union {
                 __le64 i_pad1;          /* Generic way to refer to this
                                            64bit union */
@@ -715,6 +731,136 @@ struct ocfs2_group_desc
 /*40*/  __u8    bg_bitmap[0];
 };
 
+/*
+ * On disk extended attribute structure for OCFS2.
+ */
+
+/*
+ * ocfs2_xattr_entry indicates one extend attribute.
+ *
+ * Note that it can be stored in inode, one block or one xattr bucket.
+ */
+struct ocfs2_xattr_entry {
+        __le32  xe_name_hash;    /* hash value of xattr prefix+suffix. */
+        __le16  xe_name_offset;  /* byte offset from the 1st etnry in the local
+                                    local xattr storage(inode, xattr block or
+                                    xattr bucket). */
+        __u8    xe_name_len;     /* xattr name len, does't include prefix. */
+        __u8    xe_type;         /* the low 7 bits indicates the name prefix's
+                                  * type and the highest 1 bits indicate whether
+                                  * the EA is stored in the local storage. */
+        __le64  xe_value_size;   /* real xattr value length. */
+};
+
+/*
+ * On disk structure for xattr header.
+ *
+ * One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
+ * the local xattr storage.
+ */
+struct ocfs2_xattr_header {
+        __le16  xh_count;                       /* contains the count of how
+                                                   many records are in the
+                                                   local xattr storage. */
+        __le16  xh_free_start;                  /* current offset for storing
+                                                   xattr. */
+        __le16  xh_name_value_len;              /* total length of name/value
+                                                   length in this bucket. */
+        __le16  xh_num_buckets;                 /* bucket nums in one extent
+                                                   record, only valid in the
+                                                   first bucket. */
+        __le64  xh_csum;
+        struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
+};
+
+/*
+ * On disk structure for xattr value root.
+ *
+ * It is used when one extended attribute's size is larger, and we will save it
+ * in an outside cluster. It will stored in a b-tree like file content.
+ */
+struct ocfs2_xattr_value_root {
+/*00*/  __le32  xr_clusters;              /* clusters covered by xattr value. */
+        __le32  xr_reserved0;
+        __le64  xr_last_eb_blk;           /* Pointer to last extent block */
+/*10*/  struct ocfs2_extent_list xr_list; /* Extent record list */
+};
+
+/*
+ * On disk structure for xattr tree root.
+ *
+ * It is used when there are too many extended attributes for one file. These
+ * attributes will be organized and stored in an indexed-btree.
+ */
+struct ocfs2_xattr_tree_root {
+/*00*/  __le32  xt_clusters;              /* clusters covered by xattr. */
+        __le32  xt_reserved0;
+        __le64  xt_last_eb_blk;           /* Pointer to last extent block */
+/*10*/  struct ocfs2_extent_list xt_list; /* Extent record list */
+};
+
+#define OCFS2_XATTR_INDEXED     0x1
+#define OCFS2_HASH_SHIFT        5
+#define OCFS2_XATTR_ROUND       3
+#define OCFS2_XATTR_SIZE(size)  (((size) + OCFS2_XATTR_ROUND) & \
+                                ~(OCFS2_XATTR_ROUND))
+
+#define OCFS2_XATTR_BUCKET_SIZE                 4096
+#define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET       (OCFS2_XATTR_BUCKET_SIZE \
+                                                 / OCFS2_MIN_BLOCKSIZE)
+
+/*
+ * On disk structure for xattr block.
+ */
+struct ocfs2_xattr_block {
+/*00*/  __u8    xb_signature[8];     /* Signature for verification */
+        __le16  xb_suballoc_slot;    /* Slot suballocator this
+                                        block belongs to. */
+        __le16  xb_suballoc_bit;     /* Bit offset in suballocator
+                                        block group */
+        __le32  xb_fs_generation;    /* Must match super block */
+/*10*/  __le64  xb_blkno;            /* Offset on disk, in blocks */
+        __le64  xb_csum;
+/*20*/  __le16  xb_flags;            /* Indicates whether this block contains
+                                        real xattr or a xattr tree. */
+        __le16  xb_reserved0;
+        __le32  xb_reserved1;
+        __le64  xb_reserved2;
+/*30*/  union {
+                struct ocfs2_xattr_header xb_header; /* xattr header if this
+                                                        block contains xattr */
+                struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
+                                                        block cotains xattr
+                                                        tree. */
+        } xb_attrs;
+};
+
+#define OCFS2_XATTR_ENTRY_LOCAL         0x80
+#define OCFS2_XATTR_TYPE_MASK           0x7F
+static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe,
+                                         int local)
+{
+        if (local)
+                xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL;
+        else
+                xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL;
+}
+
+static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
+{
+        return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
+}
+
+static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
+{
+        xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
+}
+
+static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
+{
+        return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
+}
+
 #ifdef __KERNEL__
 static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
 {
@@ -728,6 +874,20 @@ static inline int ocfs2_max_inline_data(struct super_block *sb)
                 offsetof(struct ocfs2_dinode, id2.i_data.id_data);
 }
 
+static inline int ocfs2_max_inline_data_with_xattr(struct super_block *sb,
+                                                   struct ocfs2_dinode *di)
+{
+        unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
+
+        if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
+                return sb->s_blocksize -
+                        offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
+                        xattrsize;
+        else
+                return sb->s_blocksize -
+                        offsetof(struct ocfs2_dinode, id2.i_data.id_data);
+}
+
 static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
 {
         int size;
@@ -738,6 +898,24 @@ static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
         return size / sizeof(struct ocfs2_extent_rec);
 }
 
+static inline int ocfs2_extent_recs_per_inode_with_xattr(
+                                                struct super_block *sb,
+                                                struct ocfs2_dinode *di)
+{
+        int size;
+        unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
+
+        if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
+                size = sb->s_blocksize -
+                        offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
+                        xattrsize;
+        else
+                size = sb->s_blocksize -
+                        offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
+
+        return size / sizeof(struct ocfs2_extent_rec);
+}
+
 static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
 {
         int size;
@@ -801,6 +979,17 @@ static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
         return 0;
 
 }
+
+static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
+{
+        int size;
+
+        size = sb->s_blocksize -
+                offsetof(struct ocfs2_xattr_block,
+                         xb_attrs.xb_root.xt_list.l_recs);
+
+        return size / sizeof(struct ocfs2_extent_rec);
+}
 #else
 static inline int ocfs2_fast_symlink_chars(int blocksize)
 {
@@ -884,6 +1073,17 @@ static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
 
         return 0;
 }
+
+static inline int ocfs2_xattr_recs_per_xb(int blocksize)
+{
+        int size;
+
+        size = blocksize -
+                offsetof(struct ocfs2_xattr_block,
+                         xb_attrs.xb_root.xt_list.l_recs);
+
+        return size / sizeof(struct ocfs2_extent_rec);
+}
 #endif  /* __KERNEL__ */
 
 
diff --git a/fs/ocfs2/ocfs2_jbd_compat.h b/fs/ocfs2/ocfs2_jbd_compat.h
new file mode 100644
index 000000000000..b91c78f8f558
--- /dev/null
+++ b/fs/ocfs2/ocfs2_jbd_compat.h
@@ -0,0 +1,82 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * ocfs2_jbd_compat.h
+ *
+ * Compatibility defines for JBD.
+ *
+ * Copyright (C) 2008 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef OCFS2_JBD_COMPAT_H
+#define OCFS2_JBD_COMPAT_H
+
+#ifndef CONFIG_OCFS2_COMPAT_JBD
+# error Should not have been included
+#endif
+
+struct jbd2_inode {
+        unsigned int dummy;
+};
+
+#define JBD2_BARRIER                    JFS_BARRIER
+#define JBD2_DEFAULT_MAX_COMMIT_AGE     JBD_DEFAULT_MAX_COMMIT_AGE
+
+#define jbd2_journal_ack_err                    journal_ack_err
+#define jbd2_journal_clear_err                  journal_clear_err
+#define jbd2_journal_destroy                    journal_destroy
+#define jbd2_journal_dirty_metadata             journal_dirty_metadata
+#define jbd2_journal_errno                      journal_errno
+#define jbd2_journal_extend                     journal_extend
+#define jbd2_journal_flush                      journal_flush
+#define jbd2_journal_force_commit               journal_force_commit
+#define jbd2_journal_get_write_access           journal_get_write_access
+#define jbd2_journal_get_undo_access            journal_get_undo_access
+#define jbd2_journal_init_inode                 journal_init_inode
+#define jbd2_journal_invalidatepage             journal_invalidatepage
+#define jbd2_journal_load                       journal_load
+#define jbd2_journal_lock_updates               journal_lock_updates
+#define jbd2_journal_restart                    journal_restart
+#define jbd2_journal_start                      journal_start
+#define jbd2_journal_start_commit               journal_start_commit
+#define jbd2_journal_stop                       journal_stop
+#define jbd2_journal_try_to_free_buffers        journal_try_to_free_buffers
+#define jbd2_journal_unlock_updates             journal_unlock_updates
+#define jbd2_journal_wipe                       journal_wipe
+#define jbd2_log_wait_commit                    log_wait_commit
+
+static inline int jbd2_journal_file_inode(handle_t *handle,
+                                          struct jbd2_inode *inode)
+{
+        return 0;
+}
+
+static inline int jbd2_journal_begin_ordered_truncate(struct jbd2_inode *inode,
+                                                      loff_t new_size)
+{
+        return 0;
+}
+
+static inline void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode,
+                                               struct inode *inode)
+{
+        return;
+}
+
+static inline void jbd2_journal_release_jbd_inode(journal_t *journal,
+                                                  struct jbd2_inode *jinode)
+{
+        return;
+}
+
+
+#endif  /* OCFS2_JBD_COMPAT_H */
diff --git a/fs/ocfs2/resize.c b/fs/ocfs2/resize.c
index 8166968e9015..ffd48db229a7 100644
--- a/fs/ocfs2/resize.c
+++ b/fs/ocfs2/resize.c
@@ -200,7 +200,7 @@ static int update_backups(struct inode * inode, u32 clusters, char *data)
                 if (cluster > clusters)
                         break;
 
-                ret = ocfs2_read_block(osb, blkno, &backup, 0, NULL);
+                ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
                 if (ret < 0) {
                         mlog_errno(ret);
                         break;
@@ -236,8 +236,8 @@ static void ocfs2_update_super_and_backups(struct inode *inode,
          * update the superblock last.
          * It doesn't matter if the write failed.
          */
-        ret = ocfs2_read_block(osb, OCFS2_SUPER_BLOCK_BLKNO,
-                               &super_bh, 0, NULL);
+        ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
+                                     &super_bh);
         if (ret < 0) {
                 mlog_errno(ret);
                 goto out;
@@ -332,8 +332,7 @@ int ocfs2_group_extend(struct inode * inode, int new_clusters)
         lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
                                               first_new_cluster - 1);
 
-        ret = ocfs2_read_block(osb, lgd_blkno, &group_bh, OCFS2_BH_CACHED,
-                               main_bm_inode);
+        ret = ocfs2_read_block(main_bm_inode, lgd_blkno, &group_bh);
         if (ret < 0) {
                 mlog_errno(ret);
                 goto out_unlock;
@@ -540,7 +539,7 @@ int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
                 goto out_unlock;
         }
 
-        ret = ocfs2_read_block(osb, input->group, &group_bh, 0, NULL);
+        ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
         if (ret < 0) {
                 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
                      "from the device.", (unsigned long long)input->group);
diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c
index bb5ff8939bf1..bdda2d8f8508 100644
--- a/fs/ocfs2/slot_map.c
+++ b/fs/ocfs2/slot_map.c
@@ -150,8 +150,8 @@ int ocfs2_refresh_slot_info(struct ocfs2_super *osb)
          * be !NULL.  Thus, ocfs2_read_blocks() will ignore blocknr.  If
          * this is not true, the read of -1 (UINT64_MAX) will fail.
          */
-        ret = ocfs2_read_blocks(osb, -1, si->si_blocks, si->si_bh, 0,
-                                si->si_inode);
+        ret = ocfs2_read_blocks(si->si_inode, -1, si->si_blocks, si->si_bh,
+                                OCFS2_BH_IGNORE_CACHE);
         if (ret == 0) {
                 spin_lock(&osb->osb_lock);
                 ocfs2_update_slot_info(si);
@@ -404,7 +404,8 @@ static int ocfs2_map_slot_buffers(struct ocfs2_super *osb,
                      (unsigned long long)blkno);
 
                 bh = NULL;  /* Acquire a fresh bh */
-                status = ocfs2_read_block(osb, blkno, &bh, 0, si->si_inode);
+                status = ocfs2_read_blocks(si->si_inode, blkno, 1, &bh,
+                                           OCFS2_BH_IGNORE_CACHE);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
diff --git a/fs/ocfs2/stack_user.c b/fs/ocfs2/stack_user.c
index 353fc35c6748..faec2d879357 100644
--- a/fs/ocfs2/stack_user.c
+++ b/fs/ocfs2/stack_user.c
@@ -28,6 +28,7 @@
 #include "ocfs2.h"  /* For struct ocfs2_lock_res */
 #include "stackglue.h"
 
+#include <linux/dlm_plock.h>
 
 /*
  * The control protocol starts with a handshake.  Until the handshake
@@ -746,6 +747,37 @@ static void user_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb)
 {
 }
 
+static int user_plock(struct ocfs2_cluster_connection *conn,
+                      u64 ino,
+                      struct file *file,
+                      int cmd,
+                      struct file_lock *fl)
+{
+        /*
+         * This more or less just demuxes the plock request into any
+         * one of three dlm calls.
+         *
+         * Internally, fs/dlm will pass these to a misc device, which
+         * a userspace daemon will read and write to.
+         *
+         * For now, cancel requests (which happen internally only),
+         * are turned into unlocks. Most of this function taken from
+         * gfs2_lock.
+         */
+
+        if (cmd == F_CANCELLK) {
+                cmd = F_SETLK;
+                fl->fl_type = F_UNLCK;
+        }
+
+        if (IS_GETLK(cmd))
+                return dlm_posix_get(conn->cc_lockspace, ino, file, fl);
+        else if (fl->fl_type == F_UNLCK)
+                return dlm_posix_unlock(conn->cc_lockspace, ino, file, fl);
+        else
+                return dlm_posix_lock(conn->cc_lockspace, ino, file, cmd, fl);
+}
+
 /*
  * Compare a requested locking protocol version against the current one.
  *
@@ -839,6 +871,7 @@ static struct ocfs2_stack_operations ocfs2_user_plugin_ops = {
         .dlm_unlock     = user_dlm_unlock,
         .lock_status    = user_dlm_lock_status,
         .lock_lvb       = user_dlm_lvb,
+        .plock          = user_plock,
         .dump_lksb      = user_dlm_dump_lksb,
 };
 
diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
index 07f348b8d721..68b668b0e60a 100644
--- a/fs/ocfs2/stackglue.c
+++ b/fs/ocfs2/stackglue.c
@@ -288,6 +288,26 @@ void ocfs2_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb)
 }
 EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb);
 
+int ocfs2_stack_supports_plocks(void)
+{
+        return active_stack && active_stack->sp_ops->plock;
+}
+EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks);
+
+/*
+ * ocfs2_plock() can only be safely called if
+ * ocfs2_stack_supports_plocks() returned true
+ */
+int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
+                struct file *file, int cmd, struct file_lock *fl)
+{
+        WARN_ON_ONCE(active_stack->sp_ops->plock == NULL);
+        if (active_stack->sp_ops->plock)
+                return active_stack->sp_ops->plock(conn, ino, file, cmd, fl);
+        return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL_GPL(ocfs2_plock);
+
 int ocfs2_cluster_connect(const char *stack_name,
                           const char *group,
                           int grouplen,
diff --git a/fs/ocfs2/stackglue.h b/fs/ocfs2/stackglue.h
index db56281dd1be..c571af375ef8 100644
--- a/fs/ocfs2/stackglue.h
+++ b/fs/ocfs2/stackglue.h
@@ -28,6 +28,10 @@
 #include "dlm/dlmapi.h"
 #include <linux/dlm.h>
 
+/* Needed for plock-related prototypes */
+struct file;
+struct file_lock;
+
 /*
  * dlmconstants.h does not have a LOCAL flag.  We hope to remove it
  * some day, but right now we need it.  Let's fake it.  This value is larger
@@ -187,6 +191,17 @@ struct ocfs2_stack_operations {
         void *(*lock_lvb)(union ocfs2_dlm_lksb *lksb);
 
         /*
+         * Cluster-aware posix locks
+         *
+         * This is NULL for stacks which do not support posix locks.
+         */
+        int (*plock)(struct ocfs2_cluster_connection *conn,
+                     u64 ino,
+                     struct file *file,
+                     int cmd,
+                     struct file_lock *fl);
+
+        /*
          * This is an optoinal debugging hook.  If provided, the
          * stack can dump debugging information about this lock.
          */
@@ -240,6 +255,10 @@ int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb);
 void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb);
 void ocfs2_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb);
 
+int ocfs2_stack_supports_plocks(void);
+int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
+                struct file *file, int cmd, struct file_lock *fl);
+
 void ocfs2_stack_glue_set_locking_protocol(struct ocfs2_locking_protocol *proto);
 
 
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index d2d278fb9819..c5ff18b46b57 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -62,15 +62,18 @@ static int ocfs2_block_group_fill(handle_t *handle,
                                   struct ocfs2_chain_list *cl);
 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
                                    struct inode *alloc_inode,
-                                   struct buffer_head *bh);
+                                   struct buffer_head *bh,
+                                   u64 max_block);
 
 static int ocfs2_cluster_group_search(struct inode *inode,
                                       struct buffer_head *group_bh,
                                       u32 bits_wanted, u32 min_bits,
+                                      u64 max_block,
                                       u16 *bit_off, u16 *bits_found);
 static int ocfs2_block_group_search(struct inode *inode,
                                     struct buffer_head *group_bh,
                                     u32 bits_wanted, u32 min_bits,
+                                    u64 max_block,
                                     u16 *bit_off, u16 *bits_found);
 static int ocfs2_claim_suballoc_bits(struct ocfs2_super *osb,
                                      struct ocfs2_alloc_context *ac,
@@ -110,8 +113,11 @@ static inline void ocfs2_block_to_cluster_group(struct inode *inode,
                                                 u64 data_blkno,
                                                 u64 *bg_blkno,
                                                 u16 *bg_bit_off);
+static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
+                                             u32 bits_wanted, u64 max_block,
+                                             struct ocfs2_alloc_context **ac);
 
-static void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
+void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
 {
         struct inode *inode = ac->ac_inode;
 
@@ -124,10 +130,8 @@ static void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac)
                 iput(inode);
                 ac->ac_inode = NULL;
         }
-        if (ac->ac_bh) {
-                brelse(ac->ac_bh);
-                ac->ac_bh = NULL;
-        }
+        brelse(ac->ac_bh);
+        ac->ac_bh = NULL;
 }
 
 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac)
@@ -276,7 +280,8 @@ static inline u16 ocfs2_find_smallest_chain(struct ocfs2_chain_list *cl)
  */
 static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
                                    struct inode *alloc_inode,
-                                   struct buffer_head *bh)
+                                   struct buffer_head *bh,
+                                   u64 max_block)
 {
         int status, credits;
         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
@@ -294,9 +299,9 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
         mlog_entry_void();
 
         cl = &fe->id2.i_chain;
-        status = ocfs2_reserve_clusters(osb,
-                                        le16_to_cpu(cl->cl_cpg),
-                                        &ac);
+        status = ocfs2_reserve_clusters_with_limit(osb,
+                                                   le16_to_cpu(cl->cl_cpg),
+                                                   max_block, &ac);
         if (status < 0) {
                 if (status != -ENOSPC)
                         mlog_errno(status);
@@ -394,8 +399,7 @@ bail:
         if (ac)
                 ocfs2_free_alloc_context(ac);
 
-        if (bg_bh)
-                brelse(bg_bh);
+        brelse(bg_bh);
 
         mlog_exit(status);
         return status;
@@ -469,7 +473,8 @@ static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
                         goto bail;
                 }
 
-                status = ocfs2_block_group_alloc(osb, alloc_inode, bh);
+                status = ocfs2_block_group_alloc(osb, alloc_inode, bh,
+                                                 ac->ac_max_block);
                 if (status < 0) {
                         if (status != -ENOSPC)
                                 mlog_errno(status);
@@ -486,16 +491,15 @@ static int ocfs2_reserve_suballoc_bits(struct ocfs2_super *osb,
         get_bh(bh);
         ac->ac_bh = bh;
 bail:
-        if (bh)
-                brelse(bh);
+        brelse(bh);
 
         mlog_exit(status);
         return status;
 }
 
-int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
-                               struct ocfs2_dinode *fe,
-                               struct ocfs2_alloc_context **ac)
+int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
+                                      int blocks,
+                                      struct ocfs2_alloc_context **ac)
 {
         int status;
         u32 slot;
@@ -507,7 +511,7 @@ int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
                 goto bail;
         }
 
-        (*ac)->ac_bits_wanted = ocfs2_extend_meta_needed(fe);
+        (*ac)->ac_bits_wanted = blocks;
         (*ac)->ac_which = OCFS2_AC_USE_META;
         slot = osb->slot_num;
         (*ac)->ac_group_search = ocfs2_block_group_search;
@@ -532,6 +536,15 @@ bail:
         return status;
 }
 
+int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
+                               struct ocfs2_extent_list *root_el,
+                               struct ocfs2_alloc_context **ac)
+{
+        return ocfs2_reserve_new_metadata_blocks(osb,
+                                        ocfs2_extend_meta_needed(root_el),
+                                        ac);
+}
+
 static int ocfs2_steal_inode_from_other_nodes(struct ocfs2_super *osb,
                                               struct ocfs2_alloc_context *ac)
 {
@@ -582,6 +595,14 @@ int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
         (*ac)->ac_group_search = ocfs2_block_group_search;
 
         /*
+         * stat(2) can't handle i_ino > 32bits, so we tell the
+         * lower levels not to allocate us a block group past that
+         * limit.  The 'inode64' mount option avoids this behavior.
+         */
+        if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64))
+                (*ac)->ac_max_block = (u32)~0U;
+
+        /*
          * slot is set when we successfully steal inode from other nodes.
          * It is reset in 3 places:
          * 1. when we flush the truncate log
@@ -661,9 +682,9 @@ bail:
 /* Callers don't need to care which bitmap (local alloc or main) to
  * use so we figure it out for them, but unfortunately this clutters
  * things a bit. */
-int ocfs2_reserve_clusters(struct ocfs2_super *osb,
-                           u32 bits_wanted,
-                           struct ocfs2_alloc_context **ac)
+static int ocfs2_reserve_clusters_with_limit(struct ocfs2_super *osb,
+                                             u32 bits_wanted, u64 max_block,
+                                             struct ocfs2_alloc_context **ac)
 {
         int status;
 
@@ -677,24 +698,20 @@ int ocfs2_reserve_clusters(struct ocfs2_super *osb,
         }
 
         (*ac)->ac_bits_wanted = bits_wanted;
+        (*ac)->ac_max_block = max_block;
 
         status = -ENOSPC;
         if (ocfs2_alloc_should_use_local(osb, bits_wanted)) {
                 status = ocfs2_reserve_local_alloc_bits(osb,
                                                         bits_wanted,
                                                         *ac);
-                if ((status < 0) && (status != -ENOSPC)) {
+                if (status == -EFBIG) {
+                        /* The local alloc window is outside ac_max_block.
+                         * use the main bitmap. */
+                        status = -ENOSPC;
+                } else if ((status < 0) && (status != -ENOSPC)) {
                         mlog_errno(status);
                         goto bail;
-                } else if (status == -ENOSPC) {
-                        /* reserve_local_bits will return enospc with
-                         * the local alloc inode still locked, so we
-                         * can change this safely here. */
-                        mlog(0, "Disabling local alloc\n");
-                        /* We set to OCFS2_LA_DISABLED so that umount
-                         * can clean up what's left of the local
-                         * allocation */
-                        osb->local_alloc_state = OCFS2_LA_DISABLED;
                 }
         }
 
@@ -718,6 +735,13 @@ bail:
         return status;
 }
 
+int ocfs2_reserve_clusters(struct ocfs2_super *osb,
+                           u32 bits_wanted,
+                           struct ocfs2_alloc_context **ac)
+{
+        return ocfs2_reserve_clusters_with_limit(osb, bits_wanted, 0, ac);
+}
+
 /*
  * More or less lifted from ext3. I'll leave their description below:
  *
@@ -1000,11 +1024,14 @@ static inline int ocfs2_block_group_reasonably_empty(struct ocfs2_group_desc *bg
 static int ocfs2_cluster_group_search(struct inode *inode,
                                       struct buffer_head *group_bh,
                                       u32 bits_wanted, u32 min_bits,
+                                      u64 max_block,
                                       u16 *bit_off, u16 *bits_found)
 {
         int search = -ENOSPC;
         int ret;
+        u64 blkoff;
         struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *) group_bh->b_data;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
         u16 tmp_off, tmp_found;
         unsigned int max_bits, gd_cluster_off;
 
@@ -1037,6 +1064,17 @@ static int ocfs2_cluster_group_search(struct inode *inode,
                 if (ret)
                         return ret;
 
+                if (max_block) {
+                        blkoff = ocfs2_clusters_to_blocks(inode->i_sb,
+                                                          gd_cluster_off +
+                                                          tmp_off + tmp_found);
+                        mlog(0, "Checking %llu against %llu\n",
+                             (unsigned long long)blkoff,
+                             (unsigned long long)max_block);
+                        if (blkoff > max_block)
+                                return -ENOSPC;
+                }
+
                 /* ocfs2_block_group_find_clear_bits() might
                  * return success, but we still want to return
                  * -ENOSPC unless it found the minimum number
@@ -1045,6 +1083,12 @@ static int ocfs2_cluster_group_search(struct inode *inode,
                         *bit_off = tmp_off;
                         *bits_found = tmp_found;
                         search = 0; /* success */
+                } else if (tmp_found) {
+                        /*
+                         * Don't show bits which we'll be returning
+                         * for allocation to the local alloc bitmap.
+                         */
+                        ocfs2_local_alloc_seen_free_bits(osb, tmp_found);
                 }
         }
 
@@ -1054,19 +1098,31 @@ static int ocfs2_cluster_group_search(struct inode *inode,
 static int ocfs2_block_group_search(struct inode *inode,
                                     struct buffer_head *group_bh,
                                     u32 bits_wanted, u32 min_bits,
+                                    u64 max_block,
                                     u16 *bit_off, u16 *bits_found)
 {
         int ret = -ENOSPC;
+        u64 blkoff;
         struct ocfs2_group_desc *bg = (struct ocfs2_group_desc *) group_bh->b_data;
 
         BUG_ON(min_bits != 1);
         BUG_ON(ocfs2_is_cluster_bitmap(inode));
 
-        if (bg->bg_free_bits_count)
+        if (bg->bg_free_bits_count) {
                 ret = ocfs2_block_group_find_clear_bits(OCFS2_SB(inode->i_sb),
                                                         group_bh, bits_wanted,
                                                         le16_to_cpu(bg->bg_bits),
                                                         bit_off, bits_found);
+                if (!ret && max_block) {
+                        blkoff = le64_to_cpu(bg->bg_blkno) + *bit_off +
+                                *bits_found;
+                        mlog(0, "Checking %llu against %llu\n",
+                             (unsigned long long)blkoff,
+                             (unsigned long long)max_block);
+                        if (blkoff > max_block)
+                                ret = -ENOSPC;
+                }
+        }
 
         return ret;
 }
@@ -1116,8 +1172,7 @@ static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
         struct ocfs2_group_desc *gd;
         struct inode *alloc_inode = ac->ac_inode;
 
-        ret = ocfs2_read_block(OCFS2_SB(alloc_inode->i_sb), gd_blkno,
-                               &group_bh, OCFS2_BH_CACHED, alloc_inode);
+        ret = ocfs2_read_block(alloc_inode, gd_blkno, &group_bh);
         if (ret < 0) {
                 mlog_errno(ret);
                 return ret;
@@ -1131,7 +1186,7 @@ static int ocfs2_search_one_group(struct ocfs2_alloc_context *ac,
         }
 
         ret = ac->ac_group_search(alloc_inode, group_bh, bits_wanted, min_bits,
-                                  bit_off, &found);
+                                  ac->ac_max_block, bit_off, &found);
         if (ret < 0) {
                 if (ret != -ENOSPC)
                         mlog_errno(ret);
@@ -1186,9 +1241,9 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
              bits_wanted, chain,
              (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno);
 
-        status = ocfs2_read_block(OCFS2_SB(alloc_inode->i_sb),
+        status = ocfs2_read_block(alloc_inode,
                                   le64_to_cpu(cl->cl_recs[chain].c_blkno),
-                                  &group_bh, OCFS2_BH_CACHED, alloc_inode);
+                                  &group_bh);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -1204,21 +1259,20 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
         /* for now, the chain search is a bit simplistic. We just use
          * the 1st group with any empty bits. */
         while ((status = ac->ac_group_search(alloc_inode, group_bh,
-                                             bits_wanted, min_bits, bit_off,
+                                             bits_wanted, min_bits,
+                                             ac->ac_max_block, bit_off,
                                              &tmp_bits)) == -ENOSPC) {
                 if (!bg->bg_next_group)
                         break;
 
-                if (prev_group_bh) {
-                        brelse(prev_group_bh);
-                        prev_group_bh = NULL;
-                }
+                brelse(prev_group_bh);
+                prev_group_bh = NULL;
+
                 next_group = le64_to_cpu(bg->bg_next_group);
                 prev_group_bh = group_bh;
                 group_bh = NULL;
-                status = ocfs2_read_block(OCFS2_SB(alloc_inode->i_sb),
-                                          next_group, &group_bh,
-                                          OCFS2_BH_CACHED, alloc_inode);
+                status = ocfs2_read_block(alloc_inode,
+                                          next_group, &group_bh);
                 if (status < 0) {
                         mlog_errno(status);
                         goto bail;
@@ -1307,10 +1361,8 @@ static int ocfs2_search_chain(struct ocfs2_alloc_context *ac,
         *bg_blkno = le64_to_cpu(bg->bg_blkno);
         *bits_left = le16_to_cpu(bg->bg_free_bits_count);
 bail:
-        if (group_bh)
-                brelse(group_bh);
-        if (prev_group_bh)
-                brelse(prev_group_bh);
+        brelse(group_bh);
+        brelse(prev_group_bh);
 
         mlog_exit(status);
         return status;
@@ -1723,7 +1775,6 @@ int ocfs2_free_suballoc_bits(handle_t *handle,
 {
         int status = 0;
         u32 tmp_used;
-        struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) alloc_bh->b_data;
         struct ocfs2_chain_list *cl = &fe->id2.i_chain;
         struct buffer_head *group_bh = NULL;
@@ -1742,8 +1793,7 @@ int ocfs2_free_suballoc_bits(handle_t *handle,
              (unsigned long long)OCFS2_I(alloc_inode)->ip_blkno, count,
              (unsigned long long)bg_blkno, start_bit);
 
-        status = ocfs2_read_block(osb, bg_blkno, &group_bh, OCFS2_BH_CACHED,
-                                  alloc_inode);
+        status = ocfs2_read_block(alloc_inode, bg_blkno, &group_bh);
         if (status < 0) {
                 mlog_errno(status);
                 goto bail;
@@ -1784,8 +1834,7 @@ int ocfs2_free_suballoc_bits(handle_t *handle,
         }
 
 bail:
-        if (group_bh)
-                brelse(group_bh);
+        brelse(group_bh);
 
         mlog_exit(status);
         return status;
@@ -1838,9 +1887,15 @@ int ocfs2_free_clusters(handle_t *handle,
         status = ocfs2_free_suballoc_bits(handle, bitmap_inode, bitmap_bh,
                                           bg_start_bit, bg_blkno,
                                           num_clusters);
-        if (status < 0)
+        if (status < 0) {
                 mlog_errno(status);
+                goto out;
+        }
 
+        ocfs2_local_alloc_seen_free_bits(OCFS2_SB(bitmap_inode->i_sb),
+                                         num_clusters);
+
+out:
         mlog_exit(status);
         return status;
 }
@@ -1891,3 +1946,84 @@ static inline void ocfs2_debug_suballoc_inode(struct ocfs2_dinode *fe)
                        (unsigned long long)fe->id2.i_chain.cl_recs[i].c_blkno);
         }
 }
+
+/*
+ * For a given allocation, determine which allocators will need to be
+ * accessed, and lock them, reserving the appropriate number of bits.
+ *
+ * Sparse file systems call this from ocfs2_write_begin_nolock()
+ * and ocfs2_allocate_unwritten_extents().
+ *
+ * File systems which don't support holes call this from
+ * ocfs2_extend_allocation().
+ */
+int ocfs2_lock_allocators(struct inode *inode,
+                          struct ocfs2_extent_tree *et,
+                          u32 clusters_to_add, u32 extents_to_split,
+                          struct ocfs2_alloc_context **data_ac,
+                          struct ocfs2_alloc_context **meta_ac)
+{
+        int ret = 0, num_free_extents;
+        unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        *meta_ac = NULL;
+        if (data_ac)
+                *data_ac = NULL;
+
+        BUG_ON(clusters_to_add != 0 && data_ac == NULL);
+
+        num_free_extents = ocfs2_num_free_extents(osb, inode, et);
+        if (num_free_extents < 0) {
+                ret = num_free_extents;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /*
+         * Sparse allocation file systems need to be more conservative
+         * with reserving room for expansion - the actual allocation
+         * happens while we've got a journal handle open so re-taking
+         * a cluster lock (because we ran out of room for another
+         * extent) will violate ordering rules.
+         *
+         * Most of the time we'll only be seeing this 1 cluster at a time
+         * anyway.
+         *
+         * Always lock for any unwritten extents - we might want to
+         * add blocks during a split.
+         */
+        if (!num_free_extents ||
+            (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) {
+                ret = ocfs2_reserve_new_metadata(osb, et->et_root_el, meta_ac);
+                if (ret < 0) {
+                        if (ret != -ENOSPC)
+                                mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        if (clusters_to_add == 0)
+                goto out;
+
+        ret = ocfs2_reserve_clusters(osb, clusters_to_add, data_ac);
+        if (ret < 0) {
+                if (ret != -ENOSPC)
+                        mlog_errno(ret);
+                goto out;
+        }
+
+out:
+        if (ret) {
+                if (*meta_ac) {
+                        ocfs2_free_alloc_context(*meta_ac);
+                        *meta_ac = NULL;
+                }
+
+                /*
+                 * We cannot have an error and a non null *data_ac.
+                 */
+        }
+
+        return ret;
+}
diff --git a/fs/ocfs2/suballoc.h b/fs/ocfs2/suballoc.h
index 544c600662bd..4df159d8f450 100644
--- a/fs/ocfs2/suballoc.h
+++ b/fs/ocfs2/suballoc.h
@@ -28,10 +28,11 @@
 
 typedef int (group_search_t)(struct inode *,
                              struct buffer_head *,
-                             u32,
-                             u32,
-                             u16 *,
-                             u16 *);
+                             u32,                       /* bits_wanted */
+                             u32,                       /* min_bits */
+                             u64,                       /* max_block */
+                             u16 *,                     /* *bit_off */
+                             u16 *);                    /* *bits_found */
 
 struct ocfs2_alloc_context {
         struct inode *ac_inode;    /* which bitmap are we allocating from? */
@@ -51,6 +52,8 @@ struct ocfs2_alloc_context {
         group_search_t *ac_group_search;
 
         u64    ac_last_group;
+        u64    ac_max_block;  /* Highest block number to allocate. 0 is
+                                 is the same as ~0 - unlimited */
 };
 
 void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac);
@@ -59,9 +62,17 @@ static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac)
         return ac->ac_bits_wanted - ac->ac_bits_given;
 }
 
+/*
+ * Please note that the caller must make sure that root_el is the root
+ * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
+ * the result may be wrong.
+ */
 int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
-                               struct ocfs2_dinode *fe,
+                               struct ocfs2_extent_list *root_el,
                                struct ocfs2_alloc_context **ac);
+int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
+                                      int blocks,
+                                      struct ocfs2_alloc_context **ac);
 int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
                             struct ocfs2_alloc_context **ac);
 int ocfs2_reserve_clusters(struct ocfs2_super *osb,
@@ -147,6 +158,7 @@ static inline int ocfs2_is_cluster_bitmap(struct inode *inode)
  * apis above. */
 int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
                                       struct ocfs2_alloc_context *ac);
+void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac);
 
 /* given a cluster offset, calculate which block group it belongs to
  * and return that block offset. */
@@ -156,4 +168,8 @@ u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster);
 int ocfs2_check_group_descriptor(struct super_block *sb,
                                  struct ocfs2_dinode *di,
                                  struct ocfs2_group_desc *gd);
+int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et,
+                          u32 clusters_to_add, u32 extents_to_split,
+                          struct ocfs2_alloc_context **data_ac,
+                          struct ocfs2_alloc_context **meta_ac);
 #endif /* _CHAINALLOC_H_ */
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 70334d85aff1..304b63ac78cf 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -64,6 +64,7 @@
 #include "sysfile.h"
 #include "uptodate.h"
 #include "ver.h"
+#include "xattr.h"
 
 #include "buffer_head_io.h"
 
@@ -154,6 +155,9 @@ enum {
         Opt_localalloc,
         Opt_localflocks,
         Opt_stack,
+        Opt_user_xattr,
+        Opt_nouser_xattr,
+        Opt_inode64,
         Opt_err,
 };
 
@@ -173,6 +177,9 @@ static const match_table_t tokens = {
         {Opt_localalloc, "localalloc=%d"},
         {Opt_localflocks, "localflocks"},
         {Opt_stack, "cluster_stack=%s"},
+        {Opt_user_xattr, "user_xattr"},
+        {Opt_nouser_xattr, "nouser_xattr"},
+        {Opt_inode64, "inode64"},
         {Opt_err, NULL}
 };
 
@@ -205,10 +212,11 @@ static int ocfs2_sync_fs(struct super_block *sb, int wait)
                 ocfs2_schedule_truncate_log_flush(osb, 0);
         }
 
-        if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
+        if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
+                                      &target)) {
                 if (wait)
-                        log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
-                                        target);
+                        jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
+                                             target);
         }
         return 0;
 }
@@ -325,6 +333,7 @@ static struct inode *ocfs2_alloc_inode(struct super_block *sb)
         if (!oi)
                 return NULL;
 
+        jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
         return &oi->vfs_inode;
 }
 
@@ -406,6 +415,15 @@ static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
                 goto out;
         }
 
+        /* Probably don't want this on remount; it might
+         * mess with other nodes */
+        if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
+            (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
+                ret = -EINVAL;
+                mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
+                goto out;
+        }
+
         /* We're going to/from readonly mode. */
         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
                 /* Lock here so the check of HARD_RO and the potential
@@ -637,7 +655,8 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
         osb->s_atime_quantum = parsed_options.atime_quantum;
         osb->preferred_slot = parsed_options.slot;
         osb->osb_commit_interval = parsed_options.commit_interval;
-        osb->local_alloc_size = parsed_options.localalloc_opt;
+        osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
+        osb->local_alloc_bits = osb->local_alloc_default_bits;
 
         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
         if (status)
@@ -743,8 +762,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
         return status;
 
 read_super_error:
-        if (bh != NULL)
-                brelse(bh);
+        brelse(bh);
 
         if (inode)
                 iput(inode);
@@ -847,6 +865,12 @@ static int ocfs2_parse_options(struct super_block *sb,
                 case Opt_data_writeback:
                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
                         break;
+                case Opt_user_xattr:
+                        mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
+                        break;
+                case Opt_nouser_xattr:
+                        mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
+                        break;
                 case Opt_atime_quantum:
                         if (match_int(&args[0], &option)) {
                                 status = 0;
@@ -873,7 +897,7 @@ static int ocfs2_parse_options(struct super_block *sb,
                         if (option < 0)
                                 return 0;
                         if (option == 0)
-                                option = JBD_DEFAULT_MAX_COMMIT_AGE;
+                                option = JBD2_DEFAULT_MAX_COMMIT_AGE;
                         mopt->commit_interval = HZ * option;
                         break;
                 case Opt_localalloc:
@@ -918,6 +942,9 @@ static int ocfs2_parse_options(struct super_block *sb,
                                OCFS2_STACK_LABEL_LEN);
                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
                         break;
+                case Opt_inode64:
+                        mopt->mount_opt |= OCFS2_MOUNT_INODE64;
+                        break;
                 default:
                         mlog(ML_ERROR,
                              "Unrecognized mount option \"%s\" "
@@ -938,6 +965,7 @@ static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 {
         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
         unsigned long opts = osb->s_mount_opt;
+        unsigned int local_alloc_megs;
 
         if (opts & OCFS2_MOUNT_HB_LOCAL)
                 seq_printf(s, ",_netdev,heartbeat=local");
@@ -970,8 +998,9 @@ static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
                 seq_printf(s, ",commit=%u",
                            (unsigned) (osb->osb_commit_interval / HZ));
 
-        if (osb->local_alloc_size != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
-                seq_printf(s, ",localalloc=%d", osb->local_alloc_size);
+        local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
+        if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
+                seq_printf(s, ",localalloc=%d", local_alloc_megs);
 
         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
                 seq_printf(s, ",localflocks,");
@@ -980,6 +1009,14 @@ static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
                            osb->osb_cluster_stack);
 
+        if (opts & OCFS2_MOUNT_NOUSERXATTR)
+                seq_printf(s, ",nouser_xattr");
+        else
+                seq_printf(s, ",user_xattr");
+
+        if (opts & OCFS2_MOUNT_INODE64)
+                seq_printf(s, ",inode64");
+
         return 0;
 }
 
@@ -1132,6 +1169,7 @@ static void ocfs2_inode_init_once(void *data)
         oi->ip_dir_start_lookup = 0;
 
         init_rwsem(&oi->ip_alloc_sem);
+        init_rwsem(&oi->ip_xattr_sem);
         mutex_init(&oi->ip_io_mutex);
 
         oi->ip_blkno = 0ULL;
@@ -1375,6 +1413,7 @@ static int ocfs2_initialize_super(struct super_block *sb,
         sb->s_fs_info = osb;
         sb->s_op = &ocfs2_sops;
         sb->s_export_op = &ocfs2_export_ops;
+        sb->s_xattr = ocfs2_xattr_handlers;
         sb->s_time_gran = 1;
         sb->s_flags |= MS_NOATIME;
         /* this is needed to support O_LARGEFILE */
@@ -1421,8 +1460,12 @@ static int ocfs2_initialize_super(struct super_block *sb,
 
         osb->slot_num = OCFS2_INVALID_SLOT;
 
+        osb->s_xattr_inline_size = le16_to_cpu(
+                                        di->id2.i_super.s_xattr_inline_size);
+
         osb->local_alloc_state = OCFS2_LA_UNUSED;
         osb->local_alloc_bh = NULL;
+        INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
 
         init_waitqueue_head(&osb->osb_mount_event);
 
@@ -1568,6 +1611,7 @@ static int ocfs2_initialize_super(struct super_block *sb,
         osb->first_cluster_group_blkno =
                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
+        osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
         mlog(0, "vol_label: %s\n", osb->vol_label);
         mlog(0, "uuid: %s\n", osb->uuid_str);
         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
diff --git a/fs/ocfs2/symlink.c b/fs/ocfs2/symlink.c
index ba9dbb51d25b..cbd03dfdc7b9 100644
--- a/fs/ocfs2/symlink.c
+++ b/fs/ocfs2/symlink.c
@@ -50,6 +50,7 @@
 #include "inode.h"
 #include "journal.h"
 #include "symlink.h"
+#include "xattr.h"
 
 #include "buffer_head_io.h"
 
@@ -83,11 +84,7 @@ static char *ocfs2_fast_symlink_getlink(struct inode *inode,
 
         mlog_entry_void();
 
-        status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
-                                  OCFS2_I(inode)->ip_blkno,
-                                  bh,
-                                  OCFS2_BH_CACHED,
-                                  inode);
+        status = ocfs2_read_block(inode, OCFS2_I(inode)->ip_blkno, bh);
         if (status < 0) {
                 mlog_errno(status);
                 link = ERR_PTR(status);
@@ -157,8 +154,7 @@ bail:
                 kunmap(page);
                 page_cache_release(page);
         }
-        if (bh)
-                brelse(bh);
+        brelse(bh);
 
         return ERR_PTR(status);
 }
@@ -168,10 +164,18 @@ const struct inode_operations ocfs2_symlink_inode_operations = {
         .follow_link    = ocfs2_follow_link,
         .getattr        = ocfs2_getattr,
         .setattr        = ocfs2_setattr,
+        .setxattr       = generic_setxattr,
+        .getxattr       = generic_getxattr,
+        .listxattr      = ocfs2_listxattr,
+        .removexattr    = generic_removexattr,
 };
 const struct inode_operations ocfs2_fast_symlink_inode_operations = {
         .readlink       = ocfs2_readlink,
         .follow_link    = ocfs2_follow_link,
         .getattr        = ocfs2_getattr,
         .setattr        = ocfs2_setattr,
+        .setxattr       = generic_setxattr,
+        .getxattr       = generic_getxattr,
+        .listxattr      = ocfs2_listxattr,
+        .removexattr    = generic_removexattr,
 };
diff --git a/fs/ocfs2/uptodate.c b/fs/ocfs2/uptodate.c
index 4da8851f2b23..187b99ff0368 100644
--- a/fs/ocfs2/uptodate.c
+++ b/fs/ocfs2/uptodate.c
@@ -53,7 +53,11 @@
 #include <linux/highmem.h>
 #include <linux/buffer_head.h>
 #include <linux/rbtree.h>
-#include <linux/jbd.h>
+#ifndef CONFIG_OCFS2_COMPAT_JBD
+# include <linux/jbd2.h>
+#else
+# include <linux/jbd.h>
+#endif
 
 #define MLOG_MASK_PREFIX ML_UPTODATE
 
@@ -511,14 +515,10 @@ static void ocfs2_remove_metadata_tree(struct ocfs2_caching_info *ci,
         ci->ci_num_cached--;
 }
 
-/* Called when we remove a chunk of metadata from an inode. We don't
- * bother reverting things to an inlined array in the case of a remove
- * which moves us back under the limit. */
-void ocfs2_remove_from_cache(struct inode *inode,
-                             struct buffer_head *bh)
+static void ocfs2_remove_block_from_cache(struct inode *inode,
+                                          sector_t block)
 {
         int index;
-        sector_t block = bh->b_blocknr;
         struct ocfs2_meta_cache_item *item = NULL;
         struct ocfs2_inode_info *oi = OCFS2_I(inode);
         struct ocfs2_caching_info *ci = &oi->ip_metadata_cache;
@@ -544,6 +544,30 @@ void ocfs2_remove_from_cache(struct inode *inode,
                 kmem_cache_free(ocfs2_uptodate_cachep, item);
 }
 
+/*
+ * Called when we remove a chunk of metadata from an inode. We don't
+ * bother reverting things to an inlined array in the case of a remove
+ * which moves us back under the limit.
+ */
+void ocfs2_remove_from_cache(struct inode *inode,
+                             struct buffer_head *bh)
+{
+        sector_t block = bh->b_blocknr;
+
+        ocfs2_remove_block_from_cache(inode, block);
+}
+
+/* Called when we remove xattr clusters from an inode. */
+void ocfs2_remove_xattr_clusters_from_cache(struct inode *inode,
+                                            sector_t block,
+                                            u32 c_len)
+{
+        unsigned int i, b_len = ocfs2_clusters_to_blocks(inode->i_sb, 1) * c_len;
+
+        for (i = 0; i < b_len; i++, block++)
+                ocfs2_remove_block_from_cache(inode, block);
+}
+
 int __init init_ocfs2_uptodate_cache(void)
 {
         ocfs2_uptodate_cachep = kmem_cache_create("ocfs2_uptodate",
diff --git a/fs/ocfs2/uptodate.h b/fs/ocfs2/uptodate.h
index 2e73206059a8..531b4b3a0c47 100644
--- a/fs/ocfs2/uptodate.h
+++ b/fs/ocfs2/uptodate.h
@@ -40,6 +40,9 @@ void ocfs2_set_new_buffer_uptodate(struct inode *inode,
                                    struct buffer_head *bh);
 void ocfs2_remove_from_cache(struct inode *inode,
                              struct buffer_head *bh);
+void ocfs2_remove_xattr_clusters_from_cache(struct inode *inode,
+                                            sector_t block,
+                                            u32 c_len);
 int ocfs2_buffer_read_ahead(struct inode *inode,
                             struct buffer_head *bh);
 
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
new file mode 100644
index 000000000000..c25780a70dfd
--- /dev/null
+++ b/fs/ocfs2/xattr.c
@@ -0,0 +1,4834 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * xattr.c
+ *
+ * Copyright (C) 2008 Oracle.  All rights reserved.
+ *
+ * CREDITS:
+ * Lots of code in this file is taken from ext3.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/capability.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/uio.h>
+#include <linux/sched.h>
+#include <linux/splice.h>
+#include <linux/mount.h>
+#include <linux/writeback.h>
+#include <linux/falloc.h>
+#include <linux/sort.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#define MLOG_MASK_PREFIX ML_XATTR
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+#include "alloc.h"
+#include "dlmglue.h"
+#include "file.h"
+#include "symlink.h"
+#include "sysfile.h"
+#include "inode.h"
+#include "journal.h"
+#include "ocfs2_fs.h"
+#include "suballoc.h"
+#include "uptodate.h"
+#include "buffer_head_io.h"
+#include "super.h"
+#include "xattr.h"
+
+
+struct ocfs2_xattr_def_value_root {
+        struct ocfs2_xattr_value_root   xv;
+        struct ocfs2_extent_rec         er;
+};
+
+struct ocfs2_xattr_bucket {
+        struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
+        struct ocfs2_xattr_header *xh;
+};
+
+#define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
+#define OCFS2_XATTR_INLINE_SIZE 80
+
+static struct ocfs2_xattr_def_value_root def_xv = {
+        .xv.xr_list.l_count = cpu_to_le16(1),
+};
+
+struct xattr_handler *ocfs2_xattr_handlers[] = {
+        &ocfs2_xattr_user_handler,
+        &ocfs2_xattr_trusted_handler,
+        NULL
+};
+
+static struct xattr_handler *ocfs2_xattr_handler_map[] = {
+        [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
+        [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
+};
+
+struct ocfs2_xattr_info {
+        int name_index;
+        const char *name;
+        const void *value;
+        size_t value_len;
+};
+
+struct ocfs2_xattr_search {
+        struct buffer_head *inode_bh;
+        /*
+         * xattr_bh point to the block buffer head which has extended attribute
+         * when extended attribute in inode, xattr_bh is equal to inode_bh.
+         */
+        struct buffer_head *xattr_bh;
+        struct ocfs2_xattr_header *header;
+        struct ocfs2_xattr_bucket bucket;
+        void *base;
+        void *end;
+        struct ocfs2_xattr_entry *here;
+        int not_found;
+};
+
+static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
+                                             struct ocfs2_xattr_header *xh,
+                                             int index,
+                                             int *block_off,
+                                             int *new_offset);
+
+static int ocfs2_xattr_index_block_find(struct inode *inode,
+                                        struct buffer_head *root_bh,
+                                        int name_index,
+                                        const char *name,
+                                        struct ocfs2_xattr_search *xs);
+
+static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
+                                        struct ocfs2_xattr_tree_root *xt,
+                                        char *buffer,
+                                        size_t buffer_size);
+
+static int ocfs2_xattr_create_index_block(struct inode *inode,
+                                          struct ocfs2_xattr_search *xs);
+
+static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
+                                             struct ocfs2_xattr_info *xi,
+                                             struct ocfs2_xattr_search *xs);
+
+static int ocfs2_delete_xattr_index_block(struct inode *inode,
+                                          struct buffer_head *xb_bh);
+
+static inline const char *ocfs2_xattr_prefix(int name_index)
+{
+        struct xattr_handler *handler = NULL;
+
+        if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
+                handler = ocfs2_xattr_handler_map[name_index];
+
+        return handler ? handler->prefix : NULL;
+}
+
+static u32 ocfs2_xattr_name_hash(struct inode *inode,
+                                 const char *name,
+                                 int name_len)
+{
+        /* Get hash value of uuid from super block */
+        u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
+        int i;
+
+        /* hash extended attribute name */
+        for (i = 0; i < name_len; i++) {
+                hash = (hash << OCFS2_HASH_SHIFT) ^
+                       (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
+                       *name++;
+        }
+
+        return hash;
+}
+
+/*
+ * ocfs2_xattr_hash_entry()
+ *
+ * Compute the hash of an extended attribute.
+ */
+static void ocfs2_xattr_hash_entry(struct inode *inode,
+                                   struct ocfs2_xattr_header *header,
+                                   struct ocfs2_xattr_entry *entry)
+{
+        u32 hash = 0;
+        char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
+
+        hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
+        entry->xe_name_hash = cpu_to_le32(hash);
+
+        return;
+}
+
+static int ocfs2_xattr_extend_allocation(struct inode *inode,
+                                         u32 clusters_to_add,
+                                         struct buffer_head *xattr_bh,
+                                         struct ocfs2_xattr_value_root *xv)
+{
+        int status = 0;
+        int restart_func = 0;
+        int credits = 0;
+        handle_t *handle = NULL;
+        struct ocfs2_alloc_context *data_ac = NULL;
+        struct ocfs2_alloc_context *meta_ac = NULL;
+        enum ocfs2_alloc_restarted why;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
+        struct ocfs2_extent_tree et;
+
+        mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
+
+        ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
+
+restart_all:
+
+        status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
+                                       &data_ac, &meta_ac);
+        if (status) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
+                                            clusters_to_add);
+        handle = ocfs2_start_trans(osb, credits);
+        if (IS_ERR(handle)) {
+                status = PTR_ERR(handle);
+                handle = NULL;
+                mlog_errno(status);
+                goto leave;
+        }
+
+restarted_transaction:
+        status = ocfs2_journal_access(handle, inode, xattr_bh,
+                                      OCFS2_JOURNAL_ACCESS_WRITE);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        prev_clusters = le32_to_cpu(xv->xr_clusters);
+        status = ocfs2_add_clusters_in_btree(osb,
+                                             inode,
+                                             &logical_start,
+                                             clusters_to_add,
+                                             0,
+                                             &et,
+                                             handle,
+                                             data_ac,
+                                             meta_ac,
+                                             &why);
+        if ((status < 0) && (status != -EAGAIN)) {
+                if (status != -ENOSPC)
+                        mlog_errno(status);
+                goto leave;
+        }
+
+        status = ocfs2_journal_dirty(handle, xattr_bh);
+        if (status < 0) {
+                mlog_errno(status);
+                goto leave;
+        }
+
+        clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
+
+        if (why != RESTART_NONE && clusters_to_add) {
+                if (why == RESTART_META) {
+                        mlog(0, "restarting function.\n");
+                        restart_func = 1;
+                } else {
+                        BUG_ON(why != RESTART_TRANS);
+
+                        mlog(0, "restarting transaction.\n");
+                        /* TODO: This can be more intelligent. */
+                        credits = ocfs2_calc_extend_credits(osb->sb,
+                                                            et.et_root_el,
+                                                            clusters_to_add);
+                        status = ocfs2_extend_trans(handle, credits);
+                        if (status < 0) {
+                                /* handle still has to be committed at
+                                 * this point. */
+                                status = -ENOMEM;
+                                mlog_errno(status);
+                                goto leave;
+                        }
+                        goto restarted_transaction;
+                }
+        }
+
+leave:
+        if (handle) {
+                ocfs2_commit_trans(osb, handle);
+                handle = NULL;
+        }
+        if (data_ac) {
+                ocfs2_free_alloc_context(data_ac);
+                data_ac = NULL;
+        }
+        if (meta_ac) {
+                ocfs2_free_alloc_context(meta_ac);
+                meta_ac = NULL;
+        }
+        if ((!status) && restart_func) {
+                restart_func = 0;
+                goto restart_all;
+        }
+
+        return status;
+}
+
+static int __ocfs2_remove_xattr_range(struct inode *inode,
+                                      struct buffer_head *root_bh,
+                                      struct ocfs2_xattr_value_root *xv,
+                                      u32 cpos, u32 phys_cpos, u32 len,
+                                      struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+        int ret;
+        u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct inode *tl_inode = osb->osb_tl_inode;
+        handle_t *handle;
+        struct ocfs2_alloc_context *meta_ac = NULL;
+        struct ocfs2_extent_tree et;
+
+        ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
+
+        ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        mutex_lock(&tl_inode->i_mutex);
+
+        if (ocfs2_truncate_log_needs_flush(osb)) {
+                ret = __ocfs2_flush_truncate_log(osb);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, root_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
+                                  dealloc);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        le32_add_cpu(&xv->xr_clusters, -len);
+
+        ret = ocfs2_journal_dirty(handle, root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
+        if (ret)
+                mlog_errno(ret);
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+out:
+        mutex_unlock(&tl_inode->i_mutex);
+
+        if (meta_ac)
+                ocfs2_free_alloc_context(meta_ac);
+
+        return ret;
+}
+
+static int ocfs2_xattr_shrink_size(struct inode *inode,
+                                   u32 old_clusters,
+                                   u32 new_clusters,
+                                   struct buffer_head *root_bh,
+                                   struct ocfs2_xattr_value_root *xv)
+{
+        int ret = 0;
+        u32 trunc_len, cpos, phys_cpos, alloc_size;
+        u64 block;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_cached_dealloc_ctxt dealloc;
+
+        ocfs2_init_dealloc_ctxt(&dealloc);
+
+        if (old_clusters <= new_clusters)
+                return 0;
+
+        cpos = new_clusters;
+        trunc_len = old_clusters - new_clusters;
+        while (trunc_len) {
+                ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
+                                               &alloc_size, &xv->xr_list);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                if (alloc_size > trunc_len)
+                        alloc_size = trunc_len;
+
+                ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
+                                                 phys_cpos, alloc_size,
+                                                 &dealloc);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
+                ocfs2_remove_xattr_clusters_from_cache(inode, block,
+                                                       alloc_size);
+                cpos += alloc_size;
+                trunc_len -= alloc_size;
+        }
+
+out:
+        ocfs2_schedule_truncate_log_flush(osb, 1);
+        ocfs2_run_deallocs(osb, &dealloc);
+
+        return ret;
+}
+
+static int ocfs2_xattr_value_truncate(struct inode *inode,
+                                      struct buffer_head *root_bh,
+                                      struct ocfs2_xattr_value_root *xv,
+                                      int len)
+{
+        int ret;
+        u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
+        u32 old_clusters = le32_to_cpu(xv->xr_clusters);
+
+        if (new_clusters == old_clusters)
+                return 0;
+
+        if (new_clusters > old_clusters)
+                ret = ocfs2_xattr_extend_allocation(inode,
+                                                    new_clusters - old_clusters,
+                                                    root_bh, xv);
+        else
+                ret = ocfs2_xattr_shrink_size(inode,
+                                              old_clusters, new_clusters,
+                                              root_bh, xv);
+
+        return ret;
+}
+
+static int ocfs2_xattr_list_entry(char *buffer, size_t size,
+                                  size_t *result, const char *prefix,
+                                  const char *name, int name_len)
+{
+        char *p = buffer + *result;
+        int prefix_len = strlen(prefix);
+        int total_len = prefix_len + name_len + 1;
+
+        *result += total_len;
+
+        /* we are just looking for how big our buffer needs to be */
+        if (!size)
+                return 0;
+
+        if (*result > size)
+                return -ERANGE;
+
+        memcpy(p, prefix, prefix_len);
+        memcpy(p + prefix_len, name, name_len);
+        p[prefix_len + name_len] = '\0';
+
+        return 0;
+}
+
+static int ocfs2_xattr_list_entries(struct inode *inode,
+                                    struct ocfs2_xattr_header *header,
+                                    char *buffer, size_t buffer_size)
+{
+        size_t result = 0;
+        int i, type, ret;
+        const char *prefix, *name;
+
+        for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
+                struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
+                type = ocfs2_xattr_get_type(entry);
+                prefix = ocfs2_xattr_prefix(type);
+
+                if (prefix) {
+                        name = (const char *)header +
+                                le16_to_cpu(entry->xe_name_offset);
+
+                        ret = ocfs2_xattr_list_entry(buffer, buffer_size,
+                                                     &result, prefix, name,
+                                                     entry->xe_name_len);
+                        if (ret)
+                                return ret;
+                }
+        }
+
+        return result;
+}
+
+static int ocfs2_xattr_ibody_list(struct inode *inode,
+                                  struct ocfs2_dinode *di,
+                                  char *buffer,
+                                  size_t buffer_size)
+{
+        struct ocfs2_xattr_header *header = NULL;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        int ret = 0;
+
+        if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
+                return ret;
+
+        header = (struct ocfs2_xattr_header *)
+                 ((void *)di + inode->i_sb->s_blocksize -
+                 le16_to_cpu(di->i_xattr_inline_size));
+
+        ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
+
+        return ret;
+}
+
+static int ocfs2_xattr_block_list(struct inode *inode,
+                                  struct ocfs2_dinode *di,
+                                  char *buffer,
+                                  size_t buffer_size)
+{
+        struct buffer_head *blk_bh = NULL;
+        struct ocfs2_xattr_block *xb;
+        int ret = 0;
+
+        if (!di->i_xattr_loc)
+                return ret;
+
+        ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        /*Verify the signature of xattr block*/
+        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
+                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
+                ret = -EFAULT;
+                goto cleanup;
+        }
+
+        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+
+        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
+                struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
+                ret = ocfs2_xattr_list_entries(inode, header,
+                                               buffer, buffer_size);
+        } else {
+                struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
+                ret = ocfs2_xattr_tree_list_index_block(inode, xt,
+                                                   buffer, buffer_size);
+        }
+cleanup:
+        brelse(blk_bh);
+
+        return ret;
+}
+
+ssize_t ocfs2_listxattr(struct dentry *dentry,
+                        char *buffer,
+                        size_t size)
+{
+        int ret = 0, i_ret = 0, b_ret = 0;
+        struct buffer_head *di_bh = NULL;
+        struct ocfs2_dinode *di = NULL;
+        struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
+
+        if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
+                return -EOPNOTSUPP;
+
+        if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
+                return ret;
+
+        ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        di = (struct ocfs2_dinode *)di_bh->b_data;
+
+        down_read(&oi->ip_xattr_sem);
+        i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
+        if (i_ret < 0)
+                b_ret = 0;
+        else {
+                if (buffer) {
+                        buffer += i_ret;
+                        size -= i_ret;
+                }
+                b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
+                                               buffer, size);
+                if (b_ret < 0)
+                        i_ret = 0;
+        }
+        up_read(&oi->ip_xattr_sem);
+        ocfs2_inode_unlock(dentry->d_inode, 0);
+
+        brelse(di_bh);
+
+        return i_ret + b_ret;
+}
+
+static int ocfs2_xattr_find_entry(int name_index,
+                                  const char *name,
+                                  struct ocfs2_xattr_search *xs)
+{
+        struct ocfs2_xattr_entry *entry;
+        size_t name_len;
+        int i, cmp = 1;
+
+        if (name == NULL)
+                return -EINVAL;
+
+        name_len = strlen(name);
+        entry = xs->here;
+        for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
+                cmp = name_index - ocfs2_xattr_get_type(entry);
+                if (!cmp)
+                        cmp = name_len - entry->xe_name_len;
+                if (!cmp)
+                        cmp = memcmp(name, (xs->base +
+                                     le16_to_cpu(entry->xe_name_offset)),
+                                     name_len);
+                if (cmp == 0)
+                        break;
+                entry += 1;
+        }
+        xs->here = entry;
+
+        return cmp ? -ENODATA : 0;
+}
+
+static int ocfs2_xattr_get_value_outside(struct inode *inode,
+                                         struct ocfs2_xattr_value_root *xv,
+                                         void *buffer,
+                                         size_t len)
+{
+        u32 cpos, p_cluster, num_clusters, bpc, clusters;
+        u64 blkno;
+        int i, ret = 0;
+        size_t cplen, blocksize;
+        struct buffer_head *bh = NULL;
+        struct ocfs2_extent_list *el;
+
+        el = &xv->xr_list;
+        clusters = le32_to_cpu(xv->xr_clusters);
+        bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
+        blocksize = inode->i_sb->s_blocksize;
+
+        cpos = 0;
+        while (cpos < clusters) {
+                ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
+                                               &num_clusters, el);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
+                /* Copy ocfs2_xattr_value */
+                for (i = 0; i < num_clusters * bpc; i++, blkno++) {
+                        ret = ocfs2_read_block(inode, blkno, &bh);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+
+                        cplen = len >= blocksize ? blocksize : len;
+                        memcpy(buffer, bh->b_data, cplen);
+                        len -= cplen;
+                        buffer += cplen;
+
+                        brelse(bh);
+                        bh = NULL;
+                        if (len == 0)
+                                break;
+                }
+                cpos += num_clusters;
+        }
+out:
+        return ret;
+}
+
+static int ocfs2_xattr_ibody_get(struct inode *inode,
+                                 int name_index,
+                                 const char *name,
+                                 void *buffer,
+                                 size_t buffer_size,
+                                 struct ocfs2_xattr_search *xs)
+{
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
+        struct ocfs2_xattr_value_root *xv;
+        size_t size;
+        int ret = 0;
+
+        if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
+                return -ENODATA;
+
+        xs->end = (void *)di + inode->i_sb->s_blocksize;
+        xs->header = (struct ocfs2_xattr_header *)
+                        (xs->end - le16_to_cpu(di->i_xattr_inline_size));
+        xs->base = (void *)xs->header;
+        xs->here = xs->header->xh_entries;
+
+        ret = ocfs2_xattr_find_entry(name_index, name, xs);
+        if (ret)
+                return ret;
+        size = le64_to_cpu(xs->here->xe_value_size);
+        if (buffer) {
+                if (size > buffer_size)
+                        return -ERANGE;
+                if (ocfs2_xattr_is_local(xs->here)) {
+                        memcpy(buffer, (void *)xs->base +
+                               le16_to_cpu(xs->here->xe_name_offset) +
+                               OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
+                } else {
+                        xv = (struct ocfs2_xattr_value_root *)
+                                (xs->base + le16_to_cpu(
+                                 xs->here->xe_name_offset) +
+                                OCFS2_XATTR_SIZE(xs->here->xe_name_len));
+                        ret = ocfs2_xattr_get_value_outside(inode, xv,
+                                                            buffer, size);
+                        if (ret < 0) {
+                                mlog_errno(ret);
+                                return ret;
+                        }
+                }
+        }
+
+        return size;
+}
+
+static int ocfs2_xattr_block_get(struct inode *inode,
+                                 int name_index,
+                                 const char *name,
+                                 void *buffer,
+                                 size_t buffer_size,
+                                 struct ocfs2_xattr_search *xs)
+{
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
+        struct buffer_head *blk_bh = NULL;
+        struct ocfs2_xattr_block *xb;
+        struct ocfs2_xattr_value_root *xv;
+        size_t size;
+        int ret = -ENODATA, name_offset, name_len, block_off, i;
+
+        if (!di->i_xattr_loc)
+                return ret;
+
+        memset(&xs->bucket, 0, sizeof(xs->bucket));
+
+        ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        /*Verify the signature of xattr block*/
+        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
+                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
+                ret = -EFAULT;
+                goto cleanup;
+        }
+
+        xs->xattr_bh = blk_bh;
+        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+
+        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
+                xs->header = &xb->xb_attrs.xb_header;
+                xs->base = (void *)xs->header;
+                xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
+                xs->here = xs->header->xh_entries;
+
+                ret = ocfs2_xattr_find_entry(name_index, name, xs);
+        } else
+                ret = ocfs2_xattr_index_block_find(inode, blk_bh,
+                                                   name_index,
+                                                   name, xs);
+
+        if (ret)
+                goto cleanup;
+        size = le64_to_cpu(xs->here->xe_value_size);
+        if (buffer) {
+                ret = -ERANGE;
+                if (size > buffer_size)
+                        goto cleanup;
+
+                name_offset = le16_to_cpu(xs->here->xe_name_offset);
+                name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
+                i = xs->here - xs->header->xh_entries;
+
+                if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
+                        ret = ocfs2_xattr_bucket_get_name_value(inode,
+                                                                xs->bucket.xh,
+                                                                i,
+                                                                &block_off,
+                                                                &name_offset);
+                        xs->base = xs->bucket.bhs[block_off]->b_data;
+                }
+                if (ocfs2_xattr_is_local(xs->here)) {
+                        memcpy(buffer, (void *)xs->base +
+                               name_offset + name_len, size);
+                } else {
+                        xv = (struct ocfs2_xattr_value_root *)
+                                (xs->base + name_offset + name_len);
+                        ret = ocfs2_xattr_get_value_outside(inode, xv,
+                                                            buffer, size);
+                        if (ret < 0) {
+                                mlog_errno(ret);
+                                goto cleanup;
+                        }
+                }
+        }
+        ret = size;
+cleanup:
+        for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
+                brelse(xs->bucket.bhs[i]);
+        memset(&xs->bucket, 0, sizeof(xs->bucket));
+
+        brelse(blk_bh);
+        return ret;
+}
+
+/* ocfs2_xattr_get()
+ *
+ * Copy an extended attribute into the buffer provided.
+ * Buffer is NULL to compute the size of buffer required.
+ */
+int ocfs2_xattr_get(struct inode *inode,
+                    int name_index,
+                    const char *name,
+                    void *buffer,
+                    size_t buffer_size)
+{
+        int ret;
+        struct ocfs2_dinode *di = NULL;
+        struct buffer_head *di_bh = NULL;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_xattr_search xis = {
+                .not_found = -ENODATA,
+        };
+        struct ocfs2_xattr_search xbs = {
+                .not_found = -ENODATA,
+        };
+
+        if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
+                return -EOPNOTSUPP;
+
+        if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
+                ret = -ENODATA;
+
+        ret = ocfs2_inode_lock(inode, &di_bh, 0);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        xis.inode_bh = xbs.inode_bh = di_bh;
+        di = (struct ocfs2_dinode *)di_bh->b_data;
+
+        down_read(&oi->ip_xattr_sem);
+        ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
+                                    buffer_size, &xis);
+        if (ret == -ENODATA)
+                ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
+                                            buffer_size, &xbs);
+        up_read(&oi->ip_xattr_sem);
+        ocfs2_inode_unlock(inode, 0);
+
+        brelse(di_bh);
+
+        return ret;
+}
+
+static int __ocfs2_xattr_set_value_outside(struct inode *inode,
+                                           struct ocfs2_xattr_value_root *xv,
+                                           const void *value,
+                                           int value_len)
+{
+        int ret = 0, i, cp_len, credits;
+        u16 blocksize = inode->i_sb->s_blocksize;
+        u32 p_cluster, num_clusters;
+        u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
+        u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
+        u64 blkno;
+        struct buffer_head *bh = NULL;
+        handle_t *handle;
+
+        BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
+
+        credits = clusters * bpc;
+        handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        while (cpos < clusters) {
+                ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
+                                               &num_clusters, &xv->xr_list);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+
+                blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
+
+                for (i = 0; i < num_clusters * bpc; i++, blkno++) {
+                        ret = ocfs2_read_block(inode, blkno, &bh);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out_commit;
+                        }
+
+                        ret = ocfs2_journal_access(handle,
+                                                   inode,
+                                                   bh,
+                                                   OCFS2_JOURNAL_ACCESS_WRITE);
+                        if (ret < 0) {
+                                mlog_errno(ret);
+                                goto out_commit;
+                        }
+
+                        cp_len = value_len > blocksize ? blocksize : value_len;
+                        memcpy(bh->b_data, value, cp_len);
+                        value_len -= cp_len;
+                        value += cp_len;
+                        if (cp_len < blocksize)
+                                memset(bh->b_data + cp_len, 0,
+                                       blocksize - cp_len);
+
+                        ret = ocfs2_journal_dirty(handle, bh);
+                        if (ret < 0) {
+                                mlog_errno(ret);
+                                goto out_commit;
+                        }
+                        brelse(bh);
+                        bh = NULL;
+
+                        /*
+                         * XXX: do we need to empty all the following
+                         * blocks in this cluster?
+                         */
+                        if (!value_len)
+                                break;
+                }
+                cpos += num_clusters;
+        }
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+out:
+        brelse(bh);
+
+        return ret;
+}
+
+static int ocfs2_xattr_cleanup(struct inode *inode,
+                               struct ocfs2_xattr_info *xi,
+                               struct ocfs2_xattr_search *xs,
+                               size_t offs)
+{
+        handle_t *handle = NULL;
+        int ret = 0;
+        size_t name_len = strlen(xi->name);
+        void *val = xs->base + offs;
+        size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
+
+        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
+                                   OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+        ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+        /* Decrease xattr count */
+        le16_add_cpu(&xs->header->xh_count, -1);
+        /* Remove the xattr entry and tree root which has already be set*/
+        memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
+        memset(val, 0, size);
+
+        ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
+        if (ret < 0)
+                mlog_errno(ret);
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+out:
+        return ret;
+}
+
+static int ocfs2_xattr_update_entry(struct inode *inode,
+                                    struct ocfs2_xattr_info *xi,
+                                    struct ocfs2_xattr_search *xs,
+                                    size_t offs)
+{
+        handle_t *handle = NULL;
+        int ret = 0;
+
+        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
+                                   OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+        ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        xs->here->xe_name_offset = cpu_to_le16(offs);
+        xs->here->xe_value_size = cpu_to_le64(xi->value_len);
+        if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
+                ocfs2_xattr_set_local(xs->here, 1);
+        else
+                ocfs2_xattr_set_local(xs->here, 0);
+        ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
+
+        ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
+        if (ret < 0)
+                mlog_errno(ret);
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+out:
+        return ret;
+}
+
+/*
+ * ocfs2_xattr_set_value_outside()
+ *
+ * Set large size value in B tree.
+ */
+static int ocfs2_xattr_set_value_outside(struct inode *inode,
+                                         struct ocfs2_xattr_info *xi,
+                                         struct ocfs2_xattr_search *xs,
+                                         size_t offs)
+{
+        size_t name_len = strlen(xi->name);
+        void *val = xs->base + offs;
+        struct ocfs2_xattr_value_root *xv = NULL;
+        size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
+        int ret = 0;
+
+        memset(val, 0, size);
+        memcpy(val, xi->name, name_len);
+        xv = (struct ocfs2_xattr_value_root *)
+                (val + OCFS2_XATTR_SIZE(name_len));
+        xv->xr_clusters = 0;
+        xv->xr_last_eb_blk = 0;
+        xv->xr_list.l_tree_depth = 0;
+        xv->xr_list.l_count = cpu_to_le16(1);
+        xv->xr_list.l_next_free_rec = 0;
+
+        ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
+                                         xi->value_len);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
+                                              xi->value_len);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
+        if (ret < 0)
+                mlog_errno(ret);
+
+        return ret;
+}
+
+/*
+ * ocfs2_xattr_set_entry_local()
+ *
+ * Set, replace or remove extended attribute in local.
+ */
+static void ocfs2_xattr_set_entry_local(struct inode *inode,
+                                        struct ocfs2_xattr_info *xi,
+                                        struct ocfs2_xattr_search *xs,
+                                        struct ocfs2_xattr_entry *last,
+                                        size_t min_offs)
+{
+        size_t name_len = strlen(xi->name);
+        int i;
+
+        if (xi->value && xs->not_found) {
+                /* Insert the new xattr entry. */
+                le16_add_cpu(&xs->header->xh_count, 1);
+                ocfs2_xattr_set_type(last, xi->name_index);
+                ocfs2_xattr_set_local(last, 1);
+                last->xe_name_len = name_len;
+        } else {
+                void *first_val;
+                void *val;
+                size_t offs, size;
+
+                first_val = xs->base + min_offs;
+                offs = le16_to_cpu(xs->here->xe_name_offset);
+                val = xs->base + offs;
+
+                if (le64_to_cpu(xs->here->xe_value_size) >
+                    OCFS2_XATTR_INLINE_SIZE)
+                        size = OCFS2_XATTR_SIZE(name_len) +
+                                OCFS2_XATTR_ROOT_SIZE;
+                else
+                        size = OCFS2_XATTR_SIZE(name_len) +
+                        OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
+
+                if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
+                                OCFS2_XATTR_SIZE(xi->value_len)) {
+                        /* The old and the new value have the
+                           same size. Just replace the value. */
+                        ocfs2_xattr_set_local(xs->here, 1);
+                        xs->here->xe_value_size = cpu_to_le64(xi->value_len);
+                        /* Clear value bytes. */
+                        memset(val + OCFS2_XATTR_SIZE(name_len),
+                               0,
+                               OCFS2_XATTR_SIZE(xi->value_len));
+                        memcpy(val + OCFS2_XATTR_SIZE(name_len),
+                               xi->value,
+                               xi->value_len);
+                        return;
+                }
+                /* Remove the old name+value. */
+                memmove(first_val + size, first_val, val - first_val);
+                memset(first_val, 0, size);
+                xs->here->xe_name_hash = 0;
+                xs->here->xe_name_offset = 0;
+                ocfs2_xattr_set_local(xs->here, 1);
+                xs->here->xe_value_size = 0;
+
+                min_offs += size;
+
+                /* Adjust all value offsets. */
+                last = xs->header->xh_entries;
+                for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
+                        size_t o = le16_to_cpu(last->xe_name_offset);
+
+                        if (o < offs)
+                                last->xe_name_offset = cpu_to_le16(o + size);
+                        last += 1;
+                }
+
+                if (!xi->value) {
+                        /* Remove the old entry. */
+                        last -= 1;
+                        memmove(xs->here, xs->here + 1,
+                                (void *)last - (void *)xs->here);
+                        memset(last, 0, sizeof(struct ocfs2_xattr_entry));
+                        le16_add_cpu(&xs->header->xh_count, -1);
+                }
+        }
+        if (xi->value) {
+                /* Insert the new name+value. */
+                size_t size = OCFS2_XATTR_SIZE(name_len) +
+                                OCFS2_XATTR_SIZE(xi->value_len);
+                void *val = xs->base + min_offs - size;
+
+                xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
+                memset(val, 0, size);
+                memcpy(val, xi->name, name_len);
+                memcpy(val + OCFS2_XATTR_SIZE(name_len),
+                       xi->value,
+                       xi->value_len);
+                xs->here->xe_value_size = cpu_to_le64(xi->value_len);
+                ocfs2_xattr_set_local(xs->here, 1);
+                ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
+        }
+
+        return;
+}
+
+/*
+ * ocfs2_xattr_set_entry()
+ *
+ * Set extended attribute entry into inode or block.
+ *
+ * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
+ * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
+ * then set value in B tree with set_value_outside().
+ */
+static int ocfs2_xattr_set_entry(struct inode *inode,
+                                 struct ocfs2_xattr_info *xi,
+                                 struct ocfs2_xattr_search *xs,
+                                 int flag)
+{
+        struct ocfs2_xattr_entry *last;
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
+        size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
+        size_t size_l = 0;
+        handle_t *handle = NULL;
+        int free, i, ret;
+        struct ocfs2_xattr_info xi_l = {
+                .name_index = xi->name_index,
+                .name = xi->name,
+                .value = xi->value,
+                .value_len = xi->value_len,
+        };
+
+        /* Compute min_offs, last and free space. */
+        last = xs->header->xh_entries;
+
+        for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
+                size_t offs = le16_to_cpu(last->xe_name_offset);
+                if (offs < min_offs)
+                        min_offs = offs;
+                last += 1;
+        }
+
+        free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
+        if (free < 0)
+                return -EFAULT;
+
+        if (!xs->not_found) {
+                size_t size = 0;
+                if (ocfs2_xattr_is_local(xs->here))
+                        size = OCFS2_XATTR_SIZE(name_len) +
+                        OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
+                else
+                        size = OCFS2_XATTR_SIZE(name_len) +
+                                OCFS2_XATTR_ROOT_SIZE;
+                free += (size + sizeof(struct ocfs2_xattr_entry));
+        }
+        /* Check free space in inode or block */
+        if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
+                if (free < sizeof(struct ocfs2_xattr_entry) +
+                           OCFS2_XATTR_SIZE(name_len) +
+                           OCFS2_XATTR_ROOT_SIZE) {
+                        ret = -ENOSPC;
+                        goto out;
+                }
+                size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
+                xi_l.value = (void *)&def_xv;
+                xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
+        } else if (xi->value) {
+                if (free < sizeof(struct ocfs2_xattr_entry) +
+                           OCFS2_XATTR_SIZE(name_len) +
+                           OCFS2_XATTR_SIZE(xi->value_len)) {
+                        ret = -ENOSPC;
+                        goto out;
+                }
+        }
+
+        if (!xs->not_found) {
+                /* For existing extended attribute */
+                size_t size = OCFS2_XATTR_SIZE(name_len) +
+                        OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
+                size_t offs = le16_to_cpu(xs->here->xe_name_offset);
+                void *val = xs->base + offs;
+
+                if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
+                        /* Replace existing local xattr with tree root */
+                        ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
+                                                            offs);
+                        if (ret < 0)
+                                mlog_errno(ret);
+                        goto out;
+                } else if (!ocfs2_xattr_is_local(xs->here)) {
+                        /* For existing xattr which has value outside */
+                        struct ocfs2_xattr_value_root *xv = NULL;
+                        xv = (struct ocfs2_xattr_value_root *)(val +
+                                OCFS2_XATTR_SIZE(name_len));
+
+                        if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
+                                /*
+                                 * If new value need set outside also,
+                                 * first truncate old value to new value,
+                                 * then set new value with set_value_outside().
+                                 */
+                                ret = ocfs2_xattr_value_truncate(inode,
+                                                                 xs->xattr_bh,
+                                                                 xv,
+                                                                 xi->value_len);
+                                if (ret < 0) {
+                                        mlog_errno(ret);
+                                        goto out;
+                                }
+
+                                ret = __ocfs2_xattr_set_value_outside(inode,
+                                                                xv,
+                                                                xi->value,
+                                                                xi->value_len);
+                                if (ret < 0) {
+                                        mlog_errno(ret);
+                                        goto out;
+                                }
+
+                                ret = ocfs2_xattr_update_entry(inode,
+                                                               xi,
+                                                               xs,
+                                                               offs);
+                                if (ret < 0)
+                                        mlog_errno(ret);
+                                goto out;
+                        } else {
+                                /*
+                                 * If new value need set in local,
+                                 * just trucate old value to zero.
+                                 */
+                                 ret = ocfs2_xattr_value_truncate(inode,
+                                                                 xs->xattr_bh,
+                                                                 xv,
+                                                                 0);
+                                if (ret < 0)
+                                        mlog_errno(ret);
+                        }
+                }
+        }
+
+        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
+                                   OCFS2_INODE_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        if (!(flag & OCFS2_INLINE_XATTR_FL)) {
+                /* set extended attribute in external block. */
+                ret = ocfs2_extend_trans(handle,
+                                         OCFS2_INODE_UPDATE_CREDITS +
+                                         OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+                ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
+                                           OCFS2_JOURNAL_ACCESS_WRITE);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+        }
+
+        /*
+         * Set value in local, include set tree root in local.
+         * This is the first step for value size >INLINE_SIZE.
+         */
+        ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
+
+        if (!(flag & OCFS2_INLINE_XATTR_FL)) {
+                ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+        }
+
+        if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
+            (flag & OCFS2_INLINE_XATTR_FL)) {
+                struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+                unsigned int xattrsize = osb->s_xattr_inline_size;
+
+                /*
+                 * Adjust extent record count or inline data size
+                 * to reserve space for extended attribute.
+                 */
+                if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+                        struct ocfs2_inline_data *idata = &di->id2.i_data;
+                        le16_add_cpu(&idata->id_count, -xattrsize);
+                } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
+                        struct ocfs2_extent_list *el = &di->id2.i_list;
+                        le16_add_cpu(&el->l_count, -(xattrsize /
+                                        sizeof(struct ocfs2_extent_rec)));
+                }
+                di->i_xattr_inline_size = cpu_to_le16(xattrsize);
+        }
+        /* Update xattr flag */
+        spin_lock(&oi->ip_lock);
+        oi->ip_dyn_features |= flag;
+        di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+        spin_unlock(&oi->ip_lock);
+        /* Update inode ctime */
+        inode->i_ctime = CURRENT_TIME;
+        di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
+        di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
+
+        ret = ocfs2_journal_dirty(handle, xs->inode_bh);
+        if (ret < 0)
+                mlog_errno(ret);
+
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+
+        if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
+                /*
+                 * Set value outside in B tree.
+                 * This is the second step for value size > INLINE_SIZE.
+                 */
+                size_t offs = le16_to_cpu(xs->here->xe_name_offset);
+                ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
+                if (ret < 0) {
+                        int ret2;
+
+                        mlog_errno(ret);
+                        /*
+                         * If set value outside failed, we have to clean
+                         * the junk tree root we have already set in local.
+                         */
+                        ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
+                        if (ret2 < 0)
+                                mlog_errno(ret2);
+                }
+        }
+out:
+        return ret;
+
+}
+
+static int ocfs2_remove_value_outside(struct inode*inode,
+                                      struct buffer_head *bh,
+                                      struct ocfs2_xattr_header *header)
+{
+        int ret = 0, i;
+
+        for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
+                struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
+
+                if (!ocfs2_xattr_is_local(entry)) {
+                        struct ocfs2_xattr_value_root *xv;
+                        void *val;
+
+                        val = (void *)header +
+                                le16_to_cpu(entry->xe_name_offset);
+                        xv = (struct ocfs2_xattr_value_root *)
+                                (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
+                        ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
+                        if (ret < 0) {
+                                mlog_errno(ret);
+                                return ret;
+                        }
+                }
+        }
+
+        return ret;
+}
+
+static int ocfs2_xattr_ibody_remove(struct inode *inode,
+                                    struct buffer_head *di_bh)
+{
+
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        struct ocfs2_xattr_header *header;
+        int ret;
+
+        header = (struct ocfs2_xattr_header *)
+                 ((void *)di + inode->i_sb->s_blocksize -
+                 le16_to_cpu(di->i_xattr_inline_size));
+
+        ret = ocfs2_remove_value_outside(inode, di_bh, header);
+
+        return ret;
+}
+
+static int ocfs2_xattr_block_remove(struct inode *inode,
+                                    struct buffer_head *blk_bh)
+{
+        struct ocfs2_xattr_block *xb;
+        int ret = 0;
+
+        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
+                struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
+                ret = ocfs2_remove_value_outside(inode, blk_bh, header);
+        } else
+                ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
+
+        return ret;
+}
+
+static int ocfs2_xattr_free_block(struct inode *inode,
+                                  u64 block)
+{
+        struct inode *xb_alloc_inode;
+        struct buffer_head *xb_alloc_bh = NULL;
+        struct buffer_head *blk_bh = NULL;
+        struct ocfs2_xattr_block *xb;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        handle_t *handle;
+        int ret = 0;
+        u64 blk, bg_blkno;
+        u16 bit;
+
+        ret = ocfs2_read_block(inode, block, &blk_bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /*Verify the signature of xattr block*/
+        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
+                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
+                ret = -EFAULT;
+                goto out;
+        }
+
+        ret = ocfs2_xattr_block_remove(inode, blk_bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+        blk = le64_to_cpu(xb->xb_blkno);
+        bit = le16_to_cpu(xb->xb_suballoc_bit);
+        bg_blkno = ocfs2_which_suballoc_group(blk, bit);
+
+        xb_alloc_inode = ocfs2_get_system_file_inode(osb,
+                                EXTENT_ALLOC_SYSTEM_INODE,
+                                le16_to_cpu(xb->xb_suballoc_slot));
+        if (!xb_alloc_inode) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+        mutex_lock(&xb_alloc_inode->i_mutex);
+
+        ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out_mutex;
+        }
+
+        handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out_unlock;
+        }
+
+        ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
+                                       bit, bg_blkno, 1);
+        if (ret < 0)
+                mlog_errno(ret);
+
+        ocfs2_commit_trans(osb, handle);
+out_unlock:
+        ocfs2_inode_unlock(xb_alloc_inode, 1);
+        brelse(xb_alloc_bh);
+out_mutex:
+        mutex_unlock(&xb_alloc_inode->i_mutex);
+        iput(xb_alloc_inode);
+out:
+        brelse(blk_bh);
+        return ret;
+}
+
+/*
+ * ocfs2_xattr_remove()
+ *
+ * Free extended attribute resources associated with this inode.
+ */
+int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
+{
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+        handle_t *handle;
+        int ret;
+
+        if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
+                return 0;
+
+        if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
+                return 0;
+
+        if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
+                ret = ocfs2_xattr_ibody_remove(inode, di_bh);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        if (di->i_xattr_loc) {
+                ret = ocfs2_xattr_free_block(inode,
+                                             le64_to_cpu(di->i_xattr_loc));
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
+                                   OCFS2_INODE_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out;
+        }
+        ret = ocfs2_journal_access(handle, inode, di_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        di->i_xattr_loc = 0;
+
+        spin_lock(&oi->ip_lock);
+        oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
+        di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+        spin_unlock(&oi->ip_lock);
+
+        ret = ocfs2_journal_dirty(handle, di_bh);
+        if (ret < 0)
+                mlog_errno(ret);
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+out:
+        return ret;
+}
+
+static int ocfs2_xattr_has_space_inline(struct inode *inode,
+                                        struct ocfs2_dinode *di)
+{
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
+        int free;
+
+        if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
+                return 0;
+
+        if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+                struct ocfs2_inline_data *idata = &di->id2.i_data;
+                free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
+        } else if (ocfs2_inode_is_fast_symlink(inode)) {
+                free = ocfs2_fast_symlink_chars(inode->i_sb) -
+                        le64_to_cpu(di->i_size);
+        } else {
+                struct ocfs2_extent_list *el = &di->id2.i_list;
+                free = (le16_to_cpu(el->l_count) -
+                        le16_to_cpu(el->l_next_free_rec)) *
+                        sizeof(struct ocfs2_extent_rec);
+        }
+        if (free >= xattrsize)
+                return 1;
+
+        return 0;
+}
+
+/*
+ * ocfs2_xattr_ibody_find()
+ *
+ * Find extended attribute in inode block and
+ * fill search info into struct ocfs2_xattr_search.
+ */
+static int ocfs2_xattr_ibody_find(struct inode *inode,
+                                  int name_index,
+                                  const char *name,
+                                  struct ocfs2_xattr_search *xs)
+{
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
+        int ret;
+        int has_space = 0;
+
+        if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
+                return 0;
+
+        if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
+                down_read(&oi->ip_alloc_sem);
+                has_space = ocfs2_xattr_has_space_inline(inode, di);
+                up_read(&oi->ip_alloc_sem);
+                if (!has_space)
+                        return 0;
+        }
+
+        xs->xattr_bh = xs->inode_bh;
+        xs->end = (void *)di + inode->i_sb->s_blocksize;
+        if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
+                xs->header = (struct ocfs2_xattr_header *)
+                        (xs->end - le16_to_cpu(di->i_xattr_inline_size));
+        else
+                xs->header = (struct ocfs2_xattr_header *)
+                        (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
+        xs->base = (void *)xs->header;
+        xs->here = xs->header->xh_entries;
+
+        /* Find the named attribute. */
+        if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
+                ret = ocfs2_xattr_find_entry(name_index, name, xs);
+                if (ret && ret != -ENODATA)
+                        return ret;
+                xs->not_found = ret;
+        }
+
+        return 0;
+}
+
+/*
+ * ocfs2_xattr_ibody_set()
+ *
+ * Set, replace or remove an extended attribute into inode block.
+ *
+ */
+static int ocfs2_xattr_ibody_set(struct inode *inode,
+                                 struct ocfs2_xattr_info *xi,
+                                 struct ocfs2_xattr_search *xs)
+{
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
+        int ret;
+
+        if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
+                return -ENOSPC;
+
+        down_write(&oi->ip_alloc_sem);
+        if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
+                if (!ocfs2_xattr_has_space_inline(inode, di)) {
+                        ret = -ENOSPC;
+                        goto out;
+                }
+        }
+
+        ret = ocfs2_xattr_set_entry(inode, xi, xs,
+                                (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
+out:
+        up_write(&oi->ip_alloc_sem);
+
+        return ret;
+}
+
+/*
+ * ocfs2_xattr_block_find()
+ *
+ * Find extended attribute in external block and
+ * fill search info into struct ocfs2_xattr_search.
+ */
+static int ocfs2_xattr_block_find(struct inode *inode,
+                                  int name_index,
+                                  const char *name,
+                                  struct ocfs2_xattr_search *xs)
+{
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
+        struct buffer_head *blk_bh = NULL;
+        struct ocfs2_xattr_block *xb;
+        int ret = 0;
+
+        if (!di->i_xattr_loc)
+                return ret;
+
+        ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        /*Verify the signature of xattr block*/
+        if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
+                   strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
+                        ret = -EFAULT;
+                        goto cleanup;
+        }
+
+        xs->xattr_bh = blk_bh;
+        xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
+
+        if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
+                xs->header = &xb->xb_attrs.xb_header;
+                xs->base = (void *)xs->header;
+                xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
+                xs->here = xs->header->xh_entries;
+
+                ret = ocfs2_xattr_find_entry(name_index, name, xs);
+        } else
+                ret = ocfs2_xattr_index_block_find(inode, blk_bh,
+                                                   name_index,
+                                                   name, xs);
+
+        if (ret && ret != -ENODATA) {
+                xs->xattr_bh = NULL;
+                goto cleanup;
+        }
+        xs->not_found = ret;
+        return 0;
+cleanup:
+        brelse(blk_bh);
+
+        return ret;
+}
+
+/*
+ * When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
+ * will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
+ * re-initialized.
+ */
+static int ocfs2_restore_xattr_block(struct inode *inode,
+                                     struct ocfs2_xattr_search *xs)
+{
+        int ret;
+        handle_t *handle;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_xattr_block *xb =
+                (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
+        struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
+        u16 xb_flags = le16_to_cpu(xb->xb_flags);
+
+        BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
+                le16_to_cpu(el->l_next_free_rec) != 0);
+
+        handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                handle = NULL;
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
+               offsetof(struct ocfs2_xattr_block, xb_attrs));
+
+        xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);
+
+        ocfs2_journal_dirty(handle, xs->xattr_bh);
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+out:
+        return ret;
+}
+
+/*
+ * ocfs2_xattr_block_set()
+ *
+ * Set, replace or remove an extended attribute into external block.
+ *
+ */
+static int ocfs2_xattr_block_set(struct inode *inode,
+                                 struct ocfs2_xattr_info *xi,
+                                 struct ocfs2_xattr_search *xs)
+{
+        struct buffer_head *new_bh = NULL;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_dinode *di =  (struct ocfs2_dinode *)xs->inode_bh->b_data;
+        struct ocfs2_alloc_context *meta_ac = NULL;
+        handle_t *handle = NULL;
+        struct ocfs2_xattr_block *xblk = NULL;
+        u16 suballoc_bit_start;
+        u32 num_got;
+        u64 first_blkno;
+        int ret;
+
+        if (!xs->xattr_bh) {
+                /*
+                 * Alloc one external block for extended attribute
+                 * outside of inode.
+                 */
+                ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+                handle = ocfs2_start_trans(osb,
+                                           OCFS2_XATTR_BLOCK_CREATE_CREDITS);
+                if (IS_ERR(handle)) {
+                        ret = PTR_ERR(handle);
+                        mlog_errno(ret);
+                        goto out;
+                }
+                ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
+                                           OCFS2_JOURNAL_ACCESS_CREATE);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+
+                ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
+                                           &suballoc_bit_start, &num_got,
+                                           &first_blkno);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+
+                new_bh = sb_getblk(inode->i_sb, first_blkno);
+                ocfs2_set_new_buffer_uptodate(inode, new_bh);
+
+                ret = ocfs2_journal_access(handle, inode, new_bh,
+                                           OCFS2_JOURNAL_ACCESS_CREATE);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+
+                /* Initialize ocfs2_xattr_block */
+                xs->xattr_bh = new_bh;
+                xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
+                memset(xblk, 0, inode->i_sb->s_blocksize);
+                strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
+                xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
+                xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
+                xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
+                xblk->xb_blkno = cpu_to_le64(first_blkno);
+
+                xs->header = &xblk->xb_attrs.xb_header;
+                xs->base = (void *)xs->header;
+                xs->end = (void *)xblk + inode->i_sb->s_blocksize;
+                xs->here = xs->header->xh_entries;
+
+
+                ret = ocfs2_journal_dirty(handle, new_bh);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+                di->i_xattr_loc = cpu_to_le64(first_blkno);
+                ret = ocfs2_journal_dirty(handle, xs->inode_bh);
+                if (ret < 0)
+                        mlog_errno(ret);
+out_commit:
+                ocfs2_commit_trans(osb, handle);
+out:
+                if (meta_ac)
+                        ocfs2_free_alloc_context(meta_ac);
+                if (ret < 0)
+                        return ret;
+        } else
+                xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
+
+        if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
+                /* Set extended attribute into external block */
+                ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
+                if (!ret || ret != -ENOSPC)
+                        goto end;
+
+                ret = ocfs2_xattr_create_index_block(inode, xs);
+                if (ret)
+                        goto end;
+        }
+
+        ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
+        if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
+                ret = ocfs2_restore_xattr_block(inode, xs);
+
+end:
+
+        return ret;
+}
+
+/*
+ * ocfs2_xattr_set()
+ *
+ * Set, replace or remove an extended attribute for this inode.
+ * value is NULL to remove an existing extended attribute, else either
+ * create or replace an extended attribute.
+ */
+int ocfs2_xattr_set(struct inode *inode,
+                    int name_index,
+                    const char *name,
+                    const void *value,
+                    size_t value_len,
+                    int flags)
+{
+        struct buffer_head *di_bh = NULL;
+        struct ocfs2_dinode *di;
+        int ret;
+        u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+
+        struct ocfs2_xattr_info xi = {
+                .name_index = name_index,
+                .name = name,
+                .value = value,
+                .value_len = value_len,
+        };
+
+        struct ocfs2_xattr_search xis = {
+                .not_found = -ENODATA,
+        };
+
+        struct ocfs2_xattr_search xbs = {
+                .not_found = -ENODATA,
+        };
+
+        if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
+                return -EOPNOTSUPP;
+
+        ret = ocfs2_inode_lock(inode, &di_bh, 1);
+        if (ret < 0) {
+                mlog_errno(ret);
+                return ret;
+        }
+        xis.inode_bh = xbs.inode_bh = di_bh;
+        di = (struct ocfs2_dinode *)di_bh->b_data;
+
+        down_write(&OCFS2_I(inode)->ip_xattr_sem);
+        /*
+         * Scan inode and external block to find the same name
+         * extended attribute and collect search infomation.
+         */
+        ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
+        if (ret)
+                goto cleanup;
+        if (xis.not_found) {
+                ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
+                if (ret)
+                        goto cleanup;
+        }
+
+        if (xis.not_found && xbs.not_found) {
+                ret = -ENODATA;
+                if (flags & XATTR_REPLACE)
+                        goto cleanup;
+                ret = 0;
+                if (!value)
+                        goto cleanup;
+        } else {
+                ret = -EEXIST;
+                if (flags & XATTR_CREATE)
+                        goto cleanup;
+        }
+
+        if (!value) {
+                /* Remove existing extended attribute */
+                if (!xis.not_found)
+                        ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
+                else if (!xbs.not_found)
+                        ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
+        } else {
+                /* We always try to set extended attribute into inode first*/
+                ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
+                if (!ret && !xbs.not_found) {
+                        /*
+                         * If succeed and that extended attribute existing in
+                         * external block, then we will remove it.
+                         */
+                        xi.value = NULL;
+                        xi.value_len = 0;
+                        ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
+                } else if (ret == -ENOSPC) {
+                        if (di->i_xattr_loc && !xbs.xattr_bh) {
+                                ret = ocfs2_xattr_block_find(inode, name_index,
+                                                             name, &xbs);
+                                if (ret)
+                                        goto cleanup;
+                        }
+                        /*
+                         * If no space in inode, we will set extended attribute
+                         * into external block.
+                         */
+                        ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
+                        if (ret)
+                                goto cleanup;
+                        if (!xis.not_found) {
+                                /*
+                                 * If succeed and that extended attribute
+                                 * existing in inode, we will remove it.
+                                 */
+                                xi.value = NULL;
+                                xi.value_len = 0;
+                                ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
+                        }
+                }
+        }
+cleanup:
+        up_write(&OCFS2_I(inode)->ip_xattr_sem);
+        ocfs2_inode_unlock(inode, 1);
+        brelse(di_bh);
+        brelse(xbs.xattr_bh);
+        for (i = 0; i < blk_per_bucket; i++)
+                brelse(xbs.bucket.bhs[i]);
+
+        return ret;
+}
+
+/*
+ * Find the xattr extent rec which may contains name_hash.
+ * e_cpos will be the first name hash of the xattr rec.
+ * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
+ */
+static int ocfs2_xattr_get_rec(struct inode *inode,
+                               u32 name_hash,
+                               u64 *p_blkno,
+                               u32 *e_cpos,
+                               u32 *num_clusters,
+                               struct ocfs2_extent_list *el)
+{
+        int ret = 0, i;
+        struct buffer_head *eb_bh = NULL;
+        struct ocfs2_extent_block *eb;
+        struct ocfs2_extent_rec *rec = NULL;
+        u64 e_blkno = 0;
+
+        if (el->l_tree_depth) {
+                ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                eb = (struct ocfs2_extent_block *) eb_bh->b_data;
+                el = &eb->h_list;
+
+                if (el->l_tree_depth) {
+                        ocfs2_error(inode->i_sb,
+                                    "Inode %lu has non zero tree depth in "
+                                    "xattr tree block %llu\n", inode->i_ino,
+                                    (unsigned long long)eb_bh->b_blocknr);
+                        ret = -EROFS;
+                        goto out;
+                }
+        }
+
+        for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
+                rec = &el->l_recs[i];
+
+                if (le32_to_cpu(rec->e_cpos) <= name_hash) {
+                        e_blkno = le64_to_cpu(rec->e_blkno);
+                        break;
+                }
+        }
+
+        if (!e_blkno) {
+                ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
+                            "record (%u, %u, 0) in xattr", inode->i_ino,
+                            le32_to_cpu(rec->e_cpos),
+                            ocfs2_rec_clusters(el, rec));
+                ret = -EROFS;
+                goto out;
+        }
+
+        *p_blkno = le64_to_cpu(rec->e_blkno);
+        *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
+        if (e_cpos)
+                *e_cpos = le32_to_cpu(rec->e_cpos);
+out:
+        brelse(eb_bh);
+        return ret;
+}
+
+typedef int (xattr_bucket_func)(struct inode *inode,
+                                struct ocfs2_xattr_bucket *bucket,
+                                void *para);
+
+static int ocfs2_find_xe_in_bucket(struct inode *inode,
+                                   struct buffer_head *header_bh,
+                                   int name_index,
+                                   const char *name,
+                                   u32 name_hash,
+                                   u16 *xe_index,
+                                   int *found)
+{
+        int i, ret = 0, cmp = 1, block_off, new_offset;
+        struct ocfs2_xattr_header *xh =
+                        (struct ocfs2_xattr_header *)header_bh->b_data;
+        size_t name_len = strlen(name);
+        struct ocfs2_xattr_entry *xe = NULL;
+        struct buffer_head *name_bh = NULL;
+        char *xe_name;
+
+        /*
+         * We don't use binary search in the bucket because there
+         * may be multiple entries with the same name hash.
+         */
+        for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
+                xe = &xh->xh_entries[i];
+
+                if (name_hash > le32_to_cpu(xe->xe_name_hash))
+                        continue;
+                else if (name_hash < le32_to_cpu(xe->xe_name_hash))
+                        break;
+
+                cmp = name_index - ocfs2_xattr_get_type(xe);
+                if (!cmp)
+                        cmp = name_len - xe->xe_name_len;
+                if (cmp)
+                        continue;
+
+                ret = ocfs2_xattr_bucket_get_name_value(inode,
+                                                        xh,
+                                                        i,
+                                                        &block_off,
+                                                        &new_offset);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                ret = ocfs2_read_block(inode, header_bh->b_blocknr + block_off,
+                                       &name_bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+                xe_name = name_bh->b_data + new_offset;
+
+                cmp = memcmp(name, xe_name, name_len);
+                brelse(name_bh);
+                name_bh = NULL;
+
+                if (cmp == 0) {
+                        *xe_index = i;
+                        *found = 1;
+                        ret = 0;
+                        break;
+                }
+        }
+
+        return ret;
+}
+
+/*
+ * Find the specified xattr entry in a series of buckets.
+ * This series start from p_blkno and last for num_clusters.
+ * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
+ * the num of the valid buckets.
+ *
+ * Return the buffer_head this xattr should reside in. And if the xattr's
+ * hash is in the gap of 2 buckets, return the lower bucket.
+ */
+static int ocfs2_xattr_bucket_find(struct inode *inode,
+                                   int name_index,
+                                   const char *name,
+                                   u32 name_hash,
+                                   u64 p_blkno,
+                                   u32 first_hash,
+                                   u32 num_clusters,
+                                   struct ocfs2_xattr_search *xs)
+{
+        int ret, found = 0;
+        struct buffer_head *bh = NULL;
+        struct buffer_head *lower_bh = NULL;
+        struct ocfs2_xattr_header *xh = NULL;
+        struct ocfs2_xattr_entry *xe = NULL;
+        u16 index = 0;
+        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+        int low_bucket = 0, bucket, high_bucket;
+        u32 last_hash;
+        u64 blkno;
+
+        ret = ocfs2_read_block(inode, p_blkno, &bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        xh = (struct ocfs2_xattr_header *)bh->b_data;
+        high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
+
+        while (low_bucket <= high_bucket) {
+                brelse(bh);
+                bh = NULL;
+                bucket = (low_bucket + high_bucket) / 2;
+
+                blkno = p_blkno + bucket * blk_per_bucket;
+
+                ret = ocfs2_read_block(inode, blkno, &bh);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                xh = (struct ocfs2_xattr_header *)bh->b_data;
+                xe = &xh->xh_entries[0];
+                if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
+                        high_bucket = bucket - 1;
+                        continue;
+                }
+
+                /*
+                 * Check whether the hash of the last entry in our
+                 * bucket is larger than the search one. for an empty
+                 * bucket, the last one is also the first one.
+                 */
+                if (xh->xh_count)
+                        xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
+
+                last_hash = le32_to_cpu(xe->xe_name_hash);
+
+                /* record lower_bh which may be the insert place. */
+                brelse(lower_bh);
+                lower_bh = bh;
+                bh = NULL;
+
+                if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
+                        low_bucket = bucket + 1;
+                        continue;
+                }
+
+                /* the searched xattr should reside in this bucket if exists. */
+                ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
+                                              name_index, name, name_hash,
+                                              &index, &found);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+                break;
+        }
+
+        /*
+         * Record the bucket we have found.
+         * When the xattr's hash value is in the gap of 2 buckets, we will
+         * always set it to the previous bucket.
+         */
+        if (!lower_bh) {
+                /*
+                 * We can't find any bucket whose first name_hash is less
+                 * than the find name_hash.
+                 */
+                BUG_ON(bh->b_blocknr != p_blkno);
+                lower_bh = bh;
+                bh = NULL;
+        }
+        xs->bucket.bhs[0] = lower_bh;
+        xs->bucket.xh = (struct ocfs2_xattr_header *)
+                                        xs->bucket.bhs[0]->b_data;
+        lower_bh = NULL;
+
+        xs->header = xs->bucket.xh;
+        xs->base = xs->bucket.bhs[0]->b_data;
+        xs->end = xs->base + inode->i_sb->s_blocksize;
+
+        if (found) {
+                /*
+                 * If we have found the xattr enty, read all the blocks in
+                 * this bucket.
+                 */
+                ret = ocfs2_read_blocks(inode, xs->bucket.bhs[0]->b_blocknr + 1,
+                                        blk_per_bucket - 1, &xs->bucket.bhs[1],
+                                        OCFS2_BH_CACHED);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                xs->here = &xs->header->xh_entries[index];
+                mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
+                     (unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
+        } else
+                ret = -ENODATA;
+
+out:
+        brelse(bh);
+        brelse(lower_bh);
+        return ret;
+}
+
+static int ocfs2_xattr_index_block_find(struct inode *inode,
+                                        struct buffer_head *root_bh,
+                                        int name_index,
+                                        const char *name,
+                                        struct ocfs2_xattr_search *xs)
+{
+        int ret;
+        struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)root_bh->b_data;
+        struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
+        struct ocfs2_extent_list *el = &xb_root->xt_list;
+        u64 p_blkno = 0;
+        u32 first_hash, num_clusters = 0;
+        u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
+
+        if (le16_to_cpu(el->l_next_free_rec) == 0)
+                return -ENODATA;
+
+        mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
+             name, name_hash, name_index);
+
+        ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
+                                  &num_clusters, el);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
+
+        mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
+             "in the rec is %u\n", num_clusters, p_blkno, first_hash);
+
+        ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
+                                      p_blkno, first_hash, num_clusters, xs);
+
+out:
+        return ret;
+}
+
+static int ocfs2_iterate_xattr_buckets(struct inode *inode,
+                                       u64 blkno,
+                                       u32 clusters,
+                                       xattr_bucket_func *func,
+                                       void *para)
+{
+        int i, j, ret = 0;
+        int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+        u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
+        u32 num_buckets = clusters * bpc;
+        struct ocfs2_xattr_bucket bucket;
+
+        memset(&bucket, 0, sizeof(bucket));
+
+        mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
+             clusters, blkno);
+
+        for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
+                ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket,
+                                        bucket.bhs, OCFS2_BH_CACHED);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
+                /*
+                 * The real bucket num in this series of blocks is stored
+                 * in the 1st bucket.
+                 */
+                if (i == 0)
+                        num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
+
+                mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno,
+                     le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash));
+                if (func) {
+                        ret = func(inode, &bucket, para);
+                        if (ret) {
+                                mlog_errno(ret);
+                                break;
+                        }
+                }
+
+                for (j = 0; j < blk_per_bucket; j++)
+                        brelse(bucket.bhs[j]);
+                memset(&bucket, 0, sizeof(bucket));
+        }
+
+out:
+        for (j = 0; j < blk_per_bucket; j++)
+                brelse(bucket.bhs[j]);
+
+        return ret;
+}
+
+struct ocfs2_xattr_tree_list {
+        char *buffer;
+        size_t buffer_size;
+        size_t result;
+};
+
+static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
+                                             struct ocfs2_xattr_header *xh,
+                                             int index,
+                                             int *block_off,
+                                             int *new_offset)
+{
+        u16 name_offset;
+
+        if (index < 0 || index >= le16_to_cpu(xh->xh_count))
+                return -EINVAL;
+
+        name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
+
+        *block_off = name_offset >> inode->i_sb->s_blocksize_bits;
+        *new_offset = name_offset % inode->i_sb->s_blocksize;
+
+        return 0;
+}
+
+static int ocfs2_list_xattr_bucket(struct inode *inode,
+                                   struct ocfs2_xattr_bucket *bucket,
+                                   void *para)
+{
+        int ret = 0, type;
+        struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
+        int i, block_off, new_offset;
+        const char *prefix, *name;
+
+        for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
+                struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
+                type = ocfs2_xattr_get_type(entry);
+                prefix = ocfs2_xattr_prefix(type);
+
+                if (prefix) {
+                        ret = ocfs2_xattr_bucket_get_name_value(inode,
+                                                                bucket->xh,
+                                                                i,
+                                                                &block_off,
+                                                                &new_offset);
+                        if (ret)
+                                break;
+
+                        name = (const char *)bucket->bhs[block_off]->b_data +
+                                new_offset;
+                        ret = ocfs2_xattr_list_entry(xl->buffer,
+                                                     xl->buffer_size,
+                                                     &xl->result,
+                                                     prefix, name,
+                                                     entry->xe_name_len);
+                        if (ret)
+                                break;
+                }
+        }
+
+        return ret;
+}
+
+static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
+                                             struct ocfs2_xattr_tree_root *xt,
+                                             char *buffer,
+                                             size_t buffer_size)
+{
+        struct ocfs2_extent_list *el = &xt->xt_list;
+        int ret = 0;
+        u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
+        u64 p_blkno = 0;
+        struct ocfs2_xattr_tree_list xl = {
+                .buffer = buffer,
+                .buffer_size = buffer_size,
+                .result = 0,
+        };
+
+        if (le16_to_cpu(el->l_next_free_rec) == 0)
+                return 0;
+
+        while (name_hash > 0) {
+                ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
+                                          &e_cpos, &num_clusters, el);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
+                                                  ocfs2_list_xattr_bucket,
+                                                  &xl);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                if (e_cpos == 0)
+                        break;
+
+                name_hash = e_cpos - 1;
+        }
+
+        ret = xl.result;
+out:
+        return ret;
+}
+
+static int cmp_xe(const void *a, const void *b)
+{
+        const struct ocfs2_xattr_entry *l = a, *r = b;
+        u32 l_hash = le32_to_cpu(l->xe_name_hash);
+        u32 r_hash = le32_to_cpu(r->xe_name_hash);
+
+        if (l_hash > r_hash)
+                return 1;
+        if (l_hash < r_hash)
+                return -1;
+        return 0;
+}
+
+static void swap_xe(void *a, void *b, int size)
+{
+        struct ocfs2_xattr_entry *l = a, *r = b, tmp;
+
+        tmp = *l;
+        memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
+        memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
+}
+
+/*
+ * When the ocfs2_xattr_block is filled up, new bucket will be created
+ * and all the xattr entries will be moved to the new bucket.
+ * Note: we need to sort the entries since they are not saved in order
+ * in the ocfs2_xattr_block.
+ */
+static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
+                                           struct buffer_head *xb_bh,
+                                           struct buffer_head *xh_bh,
+                                           struct buffer_head *data_bh)
+{
+        int i, blocksize = inode->i_sb->s_blocksize;
+        u16 offset, size, off_change;
+        struct ocfs2_xattr_entry *xe;
+        struct ocfs2_xattr_block *xb =
+                                (struct ocfs2_xattr_block *)xb_bh->b_data;
+        struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
+        struct ocfs2_xattr_header *xh =
+                                (struct ocfs2_xattr_header *)xh_bh->b_data;
+        u16 count = le16_to_cpu(xb_xh->xh_count);
+        char *target = xh_bh->b_data, *src = xb_bh->b_data;
+
+        mlog(0, "cp xattr from block %llu to bucket %llu\n",
+             (unsigned long long)xb_bh->b_blocknr,
+             (unsigned long long)xh_bh->b_blocknr);
+
+        memset(xh_bh->b_data, 0, blocksize);
+        if (data_bh)
+                memset(data_bh->b_data, 0, blocksize);
+        /*
+         * Since the xe_name_offset is based on ocfs2_xattr_header,
+         * there is a offset change corresponding to the change of
+         * ocfs2_xattr_header's position.
+         */
+        off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
+        xe = &xb_xh->xh_entries[count - 1];
+        offset = le16_to_cpu(xe->xe_name_offset) + off_change;
+        size = blocksize - offset;
+
+        /* copy all the names and values. */
+        if (data_bh)
+                target = data_bh->b_data;
+        memcpy(target + offset, src + offset, size);
+
+        /* Init new header now. */
+        xh->xh_count = xb_xh->xh_count;
+        xh->xh_num_buckets = cpu_to_le16(1);
+        xh->xh_name_value_len = cpu_to_le16(size);
+        xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
+
+        /* copy all the entries. */
+        target = xh_bh->b_data;
+        offset = offsetof(struct ocfs2_xattr_header, xh_entries);
+        size = count * sizeof(struct ocfs2_xattr_entry);
+        memcpy(target + offset, (char *)xb_xh + offset, size);
+
+        /* Change the xe offset for all the xe because of the move. */
+        off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
+                 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
+        for (i = 0; i < count; i++)
+                le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
+
+        mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
+             offset, size, off_change);
+
+        sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
+             cmp_xe, swap_xe);
+}
+
+/*
+ * After we move xattr from block to index btree, we have to
+ * update ocfs2_xattr_search to the new xe and base.
+ *
+ * When the entry is in xattr block, xattr_bh indicates the storage place.
+ * While if the entry is in index b-tree, "bucket" indicates the
+ * real place of the xattr.
+ */
+static int ocfs2_xattr_update_xattr_search(struct inode *inode,
+                                           struct ocfs2_xattr_search *xs,
+                                           struct buffer_head *old_bh,
+                                           struct buffer_head *new_bh)
+{
+        int ret = 0;
+        char *buf = old_bh->b_data;
+        struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
+        struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
+        int i, blocksize = inode->i_sb->s_blocksize;
+        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+
+        xs->bucket.bhs[0] = new_bh;
+        get_bh(new_bh);
+        xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
+        xs->header = xs->bucket.xh;
+
+        xs->base = new_bh->b_data;
+        xs->end = xs->base + inode->i_sb->s_blocksize;
+
+        if (!xs->not_found) {
+                if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
+                        ret = ocfs2_read_blocks(inode,
+                                        xs->bucket.bhs[0]->b_blocknr + 1,
+                                        blk_per_bucket - 1, &xs->bucket.bhs[1],
+                                        OCFS2_BH_CACHED);
+                        if (ret) {
+                                mlog_errno(ret);
+                                return ret;
+                        }
+
+                        i = xs->here - old_xh->xh_entries;
+                        xs->here = &xs->header->xh_entries[i];
+                }
+        }
+
+        return ret;
+}
+
+static int ocfs2_xattr_create_index_block(struct inode *inode,
+                                          struct ocfs2_xattr_search *xs)
+{
+        int ret, credits = OCFS2_SUBALLOC_ALLOC;
+        u32 bit_off, len;
+        u64 blkno;
+        handle_t *handle;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_inode_info *oi = OCFS2_I(inode);
+        struct ocfs2_alloc_context *data_ac;
+        struct buffer_head *xh_bh = NULL, *data_bh = NULL;
+        struct buffer_head *xb_bh = xs->xattr_bh;
+        struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)xb_bh->b_data;
+        struct ocfs2_xattr_tree_root *xr;
+        u16 xb_flags = le16_to_cpu(xb->xb_flags);
+        u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+
+        mlog(0, "create xattr index block for %llu\n",
+             (unsigned long long)xb_bh->b_blocknr);
+
+        BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
+
+        ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        /*
+         * XXX:
+         * We can use this lock for now, and maybe move to a dedicated mutex
+         * if performance becomes a problem later.
+         */
+        down_write(&oi->ip_alloc_sem);
+
+        /*
+         * 3 more credits, one for xattr block update, one for the 1st block
+         * of the new xattr bucket and one for the value/data.
+         */
+        credits += 3;
+        handle = ocfs2_start_trans(osb, credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                goto out_sem;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, xb_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        /*
+         * The bucket may spread in many blocks, and
+         * we will only touch the 1st block and the last block
+         * in the whole bucket(one for entry and one for data).
+         */
+        blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
+
+        mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
+
+        xh_bh = sb_getblk(inode->i_sb, blkno);
+        if (!xh_bh) {
+                ret = -EIO;
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ocfs2_set_new_buffer_uptodate(inode, xh_bh);
+
+        ret = ocfs2_journal_access(handle, inode, xh_bh,
+                                   OCFS2_JOURNAL_ACCESS_CREATE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        if (bpb > 1) {
+                data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
+                if (!data_bh) {
+                        ret = -EIO;
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+
+                ocfs2_set_new_buffer_uptodate(inode, data_bh);
+
+                ret = ocfs2_journal_access(handle, inode, data_bh,
+                                           OCFS2_JOURNAL_ACCESS_CREATE);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out_commit;
+                }
+        }
+
+        ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
+
+        ocfs2_journal_dirty(handle, xh_bh);
+        if (data_bh)
+                ocfs2_journal_dirty(handle, data_bh);
+
+        ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
+
+        /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
+        memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
+               offsetof(struct ocfs2_xattr_block, xb_attrs));
+
+        xr = &xb->xb_attrs.xb_root;
+        xr->xt_clusters = cpu_to_le32(1);
+        xr->xt_last_eb_blk = 0;
+        xr->xt_list.l_tree_depth = 0;
+        xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
+        xr->xt_list.l_next_free_rec = cpu_to_le16(1);
+
+        xr->xt_list.l_recs[0].e_cpos = 0;
+        xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
+        xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
+
+        xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
+
+        ret = ocfs2_journal_dirty(handle, xb_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+
+out_sem:
+        up_write(&oi->ip_alloc_sem);
+
+out:
+        if (data_ac)
+                ocfs2_free_alloc_context(data_ac);
+
+        brelse(xh_bh);
+        brelse(data_bh);
+
+        return ret;
+}
+
+static int cmp_xe_offset(const void *a, const void *b)
+{
+        const struct ocfs2_xattr_entry *l = a, *r = b;
+        u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
+        u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
+
+        if (l_name_offset < r_name_offset)
+                return 1;
+        if (l_name_offset > r_name_offset)
+                return -1;
+        return 0;
+}
+
+/*
+ * defrag a xattr bucket if we find that the bucket has some
+ * holes beteen name/value pairs.
+ * We will move all the name/value pairs to the end of the bucket
+ * so that we can spare some space for insertion.
+ */
+static int ocfs2_defrag_xattr_bucket(struct inode *inode,
+                                     struct ocfs2_xattr_bucket *bucket)
+{
+        int ret, i;
+        size_t end, offset, len, value_len;
+        struct ocfs2_xattr_header *xh;
+        char *entries, *buf, *bucket_buf = NULL;
+        u64 blkno = bucket->bhs[0]->b_blocknr;
+        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+        u16 xh_free_start;
+        size_t blocksize = inode->i_sb->s_blocksize;
+        handle_t *handle;
+        struct buffer_head **bhs;
+        struct ocfs2_xattr_entry *xe;
+
+        bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
+                        GFP_NOFS);
+        if (!bhs)
+                return -ENOMEM;
+
+        ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket, bhs,
+                                OCFS2_BH_CACHED);
+        if (ret)
+                goto out;
+
+        /*
+         * In order to make the operation more efficient and generic,
+         * we copy all the blocks into a contiguous memory and do the
+         * defragment there, so if anything is error, we will not touch
+         * the real block.
+         */
+        bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
+        if (!bucket_buf) {
+                ret = -EIO;
+                goto out;
+        }
+
+        buf = bucket_buf;
+        for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
+                memcpy(buf, bhs[i]->b_data, blocksize);
+
+        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                handle = NULL;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        for (i = 0; i < blk_per_bucket; i++) {
+                ret = ocfs2_journal_access(handle, inode, bhs[i],
+                                           OCFS2_JOURNAL_ACCESS_WRITE);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto commit;
+                }
+        }
+
+        xh = (struct ocfs2_xattr_header *)bucket_buf;
+        entries = (char *)xh->xh_entries;
+        xh_free_start = le16_to_cpu(xh->xh_free_start);
+
+        mlog(0, "adjust xattr bucket in %llu, count = %u, "
+             "xh_free_start = %u, xh_name_value_len = %u.\n",
+             blkno, le16_to_cpu(xh->xh_count), xh_free_start,
+             le16_to_cpu(xh->xh_name_value_len));
+
+        /*
+         * sort all the entries by their offset.
+         * the largest will be the first, so that we can
+         * move them to the end one by one.
+         */
+        sort(entries, le16_to_cpu(xh->xh_count),
+             sizeof(struct ocfs2_xattr_entry),
+             cmp_xe_offset, swap_xe);
+
+        /* Move all name/values to the end of the bucket. */
+        xe = xh->xh_entries;
+        end = OCFS2_XATTR_BUCKET_SIZE;
+        for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
+                offset = le16_to_cpu(xe->xe_name_offset);
+                if (ocfs2_xattr_is_local(xe))
+                        value_len = OCFS2_XATTR_SIZE(
+                                        le64_to_cpu(xe->xe_value_size));
+                else
+                        value_len = OCFS2_XATTR_ROOT_SIZE;
+                len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
+
+                /*
+                 * We must make sure that the name/value pair
+                 * exist in the same block. So adjust end to
+                 * the previous block end if needed.
+                 */
+                if (((end - len) / blocksize !=
+                        (end - 1) / blocksize))
+                        end = end - end % blocksize;
+
+                if (end > offset + len) {
+                        memmove(bucket_buf + end - len,
+                                bucket_buf + offset, len);
+                        xe->xe_name_offset = cpu_to_le16(end - len);
+                }
+
+                mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
+                                "bucket %llu\n", (unsigned long long)blkno);
+
+                end -= len;
+        }
+
+        mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
+                        "bucket %llu\n", (unsigned long long)blkno);
+
+        if (xh_free_start == end)
+                goto commit;
+
+        memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
+        xh->xh_free_start = cpu_to_le16(end);
+
+        /* sort the entries by their name_hash. */
+        sort(entries, le16_to_cpu(xh->xh_count),
+             sizeof(struct ocfs2_xattr_entry),
+             cmp_xe, swap_xe);
+
+        buf = bucket_buf;
+        for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
+                memcpy(bhs[i]->b_data, buf, blocksize);
+                ocfs2_journal_dirty(handle, bhs[i]);
+        }
+
+commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+out:
+
+        if (bhs) {
+                for (i = 0; i < blk_per_bucket; i++)
+                        brelse(bhs[i]);
+        }
+        kfree(bhs);
+
+        kfree(bucket_buf);
+        return ret;
+}
+
+/*
+ * Move half nums of the xattr bucket in the previous cluster to this new
+ * cluster. We only touch the last cluster of the previous extend record.
+ *
+ * first_bh is the first buffer_head of a series of bucket in the same
+ * extent rec and header_bh is the header of one bucket in this cluster.
+ * They will be updated if we move the data header_bh contains to the new
+ * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
+ */
+static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
+                                               handle_t *handle,
+                                               struct buffer_head **first_bh,
+                                               struct buffer_head **header_bh,
+                                               u64 new_blkno,
+                                               u64 prev_blkno,
+                                               u32 num_clusters,
+                                               u32 *first_hash)
+{
+        int i, ret, credits;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
+        int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
+        int blocksize = inode->i_sb->s_blocksize;
+        struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
+        struct ocfs2_xattr_header *new_xh;
+        struct ocfs2_xattr_header *xh =
+                        (struct ocfs2_xattr_header *)((*first_bh)->b_data);
+
+        BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
+        BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
+
+        prev_bh = *first_bh;
+        get_bh(prev_bh);
+        xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
+
+        prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
+
+        mlog(0, "move half of xattrs in cluster %llu to %llu\n",
+             prev_blkno, new_blkno);
+
+        /*
+         * We need to update the 1st half of the new cluster and
+         * 1 more for the update of the 1st bucket of the previous
+         * extent record.
+         */
+        credits = bpc / 2 + 1;
+        ret = ocfs2_extend_trans(handle, credits);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, prev_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
+                old_bh = new_bh = NULL;
+                new_bh = sb_getblk(inode->i_sb, new_blkno);
+                if (!new_bh) {
+                        ret = -EIO;
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                ocfs2_set_new_buffer_uptodate(inode, new_bh);
+
+                ret = ocfs2_journal_access(handle, inode, new_bh,
+                                           OCFS2_JOURNAL_ACCESS_CREATE);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        brelse(new_bh);
+                        goto out;
+                }
+
+                ret = ocfs2_read_block(inode, prev_blkno, &old_bh);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        brelse(new_bh);
+                        goto out;
+                }
+
+                memcpy(new_bh->b_data, old_bh->b_data, blocksize);
+
+                if (i == 0) {
+                        new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
+                        new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
+
+                        if (first_hash)
+                                *first_hash = le32_to_cpu(
+                                        new_xh->xh_entries[0].xe_name_hash);
+                        new_first_bh = new_bh;
+                        get_bh(new_first_bh);
+                }
+
+                ocfs2_journal_dirty(handle, new_bh);
+
+                if (*header_bh == old_bh) {
+                        brelse(*header_bh);
+                        *header_bh = new_bh;
+                        get_bh(*header_bh);
+
+                        brelse(*first_bh);
+                        *first_bh = new_first_bh;
+                        get_bh(*first_bh);
+                }
+                brelse(new_bh);
+                brelse(old_bh);
+        }
+
+        le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
+
+        ocfs2_journal_dirty(handle, prev_bh);
+out:
+        brelse(prev_bh);
+        brelse(new_first_bh);
+        return ret;
+}
+
+static int ocfs2_read_xattr_bucket(struct inode *inode,
+                                   u64 blkno,
+                                   struct buffer_head **bhs,
+                                   int new)
+{
+        int ret = 0;
+        u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+
+        if (!new)
+                return ocfs2_read_blocks(inode, blkno,
+                                         blk_per_bucket, bhs,
+                                         OCFS2_BH_CACHED);
+
+        for (i = 0; i < blk_per_bucket; i++) {
+                bhs[i] = sb_getblk(inode->i_sb, blkno + i);
+                if (bhs[i] == NULL) {
+                        ret = -EIO;
+                        mlog_errno(ret);
+                        break;
+                }
+                ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
+        }
+
+        return ret;
+}
+
+/*
+ * Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
+ * first_hash will record the 1st hash of the new bucket.
+ */
+static int ocfs2_half_xattr_bucket(struct inode *inode,
+                                   handle_t *handle,
+                                   u64 blk,
+                                   u64 new_blk,
+                                   u32 *first_hash,
+                                   int new_bucket_head)
+{
+        int ret, i;
+        u16 count, start, len, name_value_len, xe_len, name_offset;
+        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+        struct buffer_head **s_bhs, **t_bhs = NULL;
+        struct ocfs2_xattr_header *xh;
+        struct ocfs2_xattr_entry *xe;
+        int blocksize = inode->i_sb->s_blocksize;
+
+        mlog(0, "move half of xattrs from bucket %llu to %llu\n",
+             blk, new_blk);
+
+        s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
+        if (!s_bhs)
+                return -ENOMEM;
+
+        ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, s_bhs[0],
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
+        if (!t_bhs) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        for (i = 0; i < blk_per_bucket; i++) {
+                ret = ocfs2_journal_access(handle, inode, t_bhs[i],
+                                           OCFS2_JOURNAL_ACCESS_CREATE);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        /* copy the whole bucket to the new first. */
+        for (i = 0; i < blk_per_bucket; i++)
+                memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
+
+        /* update the new bucket. */
+        xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
+        count = le16_to_cpu(xh->xh_count);
+        start = count / 2;
+
+        /*
+         * Calculate the total name/value len and xh_free_start for
+         * the old bucket first.
+         */
+        name_offset = OCFS2_XATTR_BUCKET_SIZE;
+        name_value_len = 0;
+        for (i = 0; i < start; i++) {
+                xe = &xh->xh_entries[i];
+                xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
+                if (ocfs2_xattr_is_local(xe))
+                        xe_len +=
+                           OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
+                else
+                        xe_len += OCFS2_XATTR_ROOT_SIZE;
+                name_value_len += xe_len;
+                if (le16_to_cpu(xe->xe_name_offset) < name_offset)
+                        name_offset = le16_to_cpu(xe->xe_name_offset);
+        }
+
+        /*
+         * Now begin the modification to the new bucket.
+         *
+         * In the new bucket, We just move the xattr entry to the beginning
+         * and don't touch the name/value. So there will be some holes in the
+         * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
+         * called.
+         */
+        xe = &xh->xh_entries[start];
+        len = sizeof(struct ocfs2_xattr_entry) * (count - start);
+        mlog(0, "mv xattr entry len %d from %d to %d\n", len,
+             (int)((char *)xe - (char *)xh),
+             (int)((char *)xh->xh_entries - (char *)xh));
+        memmove((char *)xh->xh_entries, (char *)xe, len);
+        xe = &xh->xh_entries[count - start];
+        len = sizeof(struct ocfs2_xattr_entry) * start;
+        memset((char *)xe, 0, len);
+
+        le16_add_cpu(&xh->xh_count, -start);
+        le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
+
+        /* Calculate xh_free_start for the new bucket. */
+        xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
+        for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
+                xe = &xh->xh_entries[i];
+                xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
+                if (ocfs2_xattr_is_local(xe))
+                        xe_len +=
+                           OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
+                else
+                        xe_len += OCFS2_XATTR_ROOT_SIZE;
+                if (le16_to_cpu(xe->xe_name_offset) <
+                    le16_to_cpu(xh->xh_free_start))
+                        xh->xh_free_start = xe->xe_name_offset;
+        }
+
+        /* set xh->xh_num_buckets for the new xh. */
+        if (new_bucket_head)
+                xh->xh_num_buckets = cpu_to_le16(1);
+        else
+                xh->xh_num_buckets = 0;
+
+        for (i = 0; i < blk_per_bucket; i++) {
+                ocfs2_journal_dirty(handle, t_bhs[i]);
+                if (ret)
+                        mlog_errno(ret);
+        }
+
+        /* store the first_hash of the new bucket. */
+        if (first_hash)
+                *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
+
+        /*
+         * Now only update the 1st block of the old bucket.
+         * Please note that the entry has been sorted already above.
+         */
+        xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
+        memset(&xh->xh_entries[start], 0,
+               sizeof(struct ocfs2_xattr_entry) * (count - start));
+        xh->xh_count = cpu_to_le16(start);
+        xh->xh_free_start = cpu_to_le16(name_offset);
+        xh->xh_name_value_len = cpu_to_le16(name_value_len);
+
+        ocfs2_journal_dirty(handle, s_bhs[0]);
+        if (ret)
+                mlog_errno(ret);
+
+out:
+        if (s_bhs) {
+                for (i = 0; i < blk_per_bucket; i++)
+                        brelse(s_bhs[i]);
+        }
+        kfree(s_bhs);
+
+        if (t_bhs) {
+                for (i = 0; i < blk_per_bucket; i++)
+                        brelse(t_bhs[i]);
+        }
+        kfree(t_bhs);
+
+        return ret;
+}
+
+/*
+ * Copy xattr from one bucket to another bucket.
+ *
+ * The caller must make sure that the journal transaction
+ * has enough space for journaling.
+ */
+static int ocfs2_cp_xattr_bucket(struct inode *inode,
+                                 handle_t *handle,
+                                 u64 s_blkno,
+                                 u64 t_blkno,
+                                 int t_is_new)
+{
+        int ret, i;
+        int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+        int blocksize = inode->i_sb->s_blocksize;
+        struct buffer_head **s_bhs, **t_bhs = NULL;
+
+        BUG_ON(s_blkno == t_blkno);
+
+        mlog(0, "cp bucket %llu to %llu, target is %d\n",
+             s_blkno, t_blkno, t_is_new);
+
+        s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
+                        GFP_NOFS);
+        if (!s_bhs)
+                return -ENOMEM;
+
+        ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
+        if (ret)
+                goto out;
+
+        t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
+                        GFP_NOFS);
+        if (!t_bhs) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
+        if (ret)
+                goto out;
+
+        for (i = 0; i < blk_per_bucket; i++) {
+                ret = ocfs2_journal_access(handle, inode, t_bhs[i],
+                                           OCFS2_JOURNAL_ACCESS_WRITE);
+                if (ret)
+                        goto out;
+        }
+
+        for (i = 0; i < blk_per_bucket; i++) {
+                memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
+                ocfs2_journal_dirty(handle, t_bhs[i]);
+        }
+
+out:
+        if (s_bhs) {
+                for (i = 0; i < blk_per_bucket; i++)
+                        brelse(s_bhs[i]);
+        }
+        kfree(s_bhs);
+
+        if (t_bhs) {
+                for (i = 0; i < blk_per_bucket; i++)
+                        brelse(t_bhs[i]);
+        }
+        kfree(t_bhs);
+
+        return ret;
+}
+
+/*
+ * Copy one xattr cluster from src_blk to to_blk.
+ * The to_blk will become the first bucket header of the cluster, so its
+ * xh_num_buckets will be initialized as the bucket num in the cluster.
+ */
+static int ocfs2_cp_xattr_cluster(struct inode *inode,
+                                  handle_t *handle,
+                                  struct buffer_head *first_bh,
+                                  u64 src_blk,
+                                  u64 to_blk,
+                                  u32 *first_hash)
+{
+        int i, ret, credits;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
+        int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
+        struct buffer_head *bh = NULL;
+        struct ocfs2_xattr_header *xh;
+        u64 to_blk_start = to_blk;
+
+        mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
+
+        /*
+         * We need to update the new cluster and 1 more for the update of
+         * the 1st bucket of the previous extent rec.
+         */
+        credits = bpc + 1;
+        ret = ocfs2_extend_trans(handle, credits);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, first_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        for (i = 0; i < num_buckets; i++) {
+                ret = ocfs2_cp_xattr_bucket(inode, handle,
+                                            src_blk, to_blk, 1);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+                to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+        }
+
+        /* update the old bucket header. */
+        xh = (struct ocfs2_xattr_header *)first_bh->b_data;
+        le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
+
+        ocfs2_journal_dirty(handle, first_bh);
+
+        /* update the new bucket header. */
+        ret = ocfs2_read_block(inode, to_blk_start, &bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        xh = (struct ocfs2_xattr_header *)bh->b_data;
+        xh->xh_num_buckets = cpu_to_le16(num_buckets);
+
+        ocfs2_journal_dirty(handle, bh);
+
+        if (first_hash)
+                *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
+out:
+        brelse(bh);
+        return ret;
+}
+
+/*
+ * Move half of the xattrs in this cluster to the new cluster.
+ * This function should only be called when bucket size == cluster size.
+ * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
+ */
+static int ocfs2_half_xattr_cluster(struct inode *inode,
+                                    handle_t *handle,
+                                    u64 prev_blk,
+                                    u64 new_blk,
+                                    u32 *first_hash)
+{
+        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+        int ret, credits = 2 * blk_per_bucket;
+
+        BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
+
+        ret = ocfs2_extend_trans(handle, credits);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        /* Move half of the xattr in start_blk to the next bucket. */
+        return  ocfs2_half_xattr_bucket(inode, handle, prev_blk,
+                                        new_blk, first_hash, 1);
+}
+
+/*
+ * Move some xattrs from the old cluster to the new one since they are not
+ * contiguous in ocfs2 xattr tree.
+ *
+ * new_blk starts a new separate cluster, and we will move some xattrs from
+ * prev_blk to it. v_start will be set as the first name hash value in this
+ * new cluster so that it can be used as e_cpos during tree insertion and
+ * don't collide with our original b-tree operations. first_bh and header_bh
+ * will also be updated since they will be used in ocfs2_extend_xattr_bucket
+ * to extend the insert bucket.
+ *
+ * The problem is how much xattr should we move to the new one and when should
+ * we update first_bh and header_bh?
+ * 1. If cluster size > bucket size, that means the previous cluster has more
+ *    than 1 bucket, so just move half nums of bucket into the new cluster and
+ *    update the first_bh and header_bh if the insert bucket has been moved
+ *    to the new cluster.
+ * 2. If cluster_size == bucket_size:
+ *    a) If the previous extent rec has more than one cluster and the insert
+ *       place isn't in the last cluster, copy the entire last cluster to the
+ *       new one. This time, we don't need to upate the first_bh and header_bh
+ *       since they will not be moved into the new cluster.
+ *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
+ *       the new one. And we set the extend flag to zero if the insert place is
+ *       moved into the new allocated cluster since no extend is needed.
+ */
+static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
+                                            handle_t *handle,
+                                            struct buffer_head **first_bh,
+                                            struct buffer_head **header_bh,
+                                            u64 new_blk,
+                                            u64 prev_blk,
+                                            u32 prev_clusters,
+                                            u32 *v_start,
+                                            int *extend)
+{
+        int ret = 0;
+        int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
+
+        mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
+             prev_blk, prev_clusters, new_blk);
+
+        if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
+                ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
+                                                          handle,
+                                                          first_bh,
+                                                          header_bh,
+                                                          new_blk,
+                                                          prev_blk,
+                                                          prev_clusters,
+                                                          v_start);
+        else {
+                u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
+
+                if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
+                        ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
+                                                     last_blk, new_blk,
+                                                     v_start);
+                else {
+                        ret = ocfs2_half_xattr_cluster(inode, handle,
+                                                       last_blk, new_blk,
+                                                       v_start);
+
+                        if ((*header_bh)->b_blocknr == last_blk && extend)
+                                *extend = 0;
+                }
+        }
+
+        return ret;
+}
+
+/*
+ * Add a new cluster for xattr storage.
+ *
+ * If the new cluster is contiguous with the previous one, it will be
+ * appended to the same extent record, and num_clusters will be updated.
+ * If not, we will insert a new extent for it and move some xattrs in
+ * the last cluster into the new allocated one.
+ * We also need to limit the maximum size of a btree leaf, otherwise we'll
+ * lose the benefits of hashing because we'll have to search large leaves.
+ * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
+ * if it's bigger).
+ *
+ * first_bh is the first block of the previous extent rec and header_bh
+ * indicates the bucket we will insert the new xattrs. They will be updated
+ * when the header_bh is moved into the new cluster.
+ */
+static int ocfs2_add_new_xattr_cluster(struct inode *inode,
+                                       struct buffer_head *root_bh,
+                                       struct buffer_head **first_bh,
+                                       struct buffer_head **header_bh,
+                                       u32 *num_clusters,
+                                       u32 prev_cpos,
+                                       u64 prev_blkno,
+                                       int *extend)
+{
+        int ret, credits;
+        u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
+        u32 prev_clusters = *num_clusters;
+        u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
+        u64 block;
+        handle_t *handle = NULL;
+        struct ocfs2_alloc_context *data_ac = NULL;
+        struct ocfs2_alloc_context *meta_ac = NULL;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_extent_tree et;
+
+        mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
+             "previous xattr blkno = %llu\n",
+             (unsigned long long)OCFS2_I(inode)->ip_blkno,
+             prev_cpos, prev_blkno);
+
+        ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
+
+        ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
+                                    &data_ac, &meta_ac);
+        if (ret) {
+                mlog_errno(ret);
+                goto leave;
+        }
+
+        credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
+                                            clusters_to_add);
+        handle = ocfs2_start_trans(osb, credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                handle = NULL;
+                mlog_errno(ret);
+                goto leave;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, root_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto leave;
+        }
+
+        ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
+                                     clusters_to_add, &bit_off, &num_bits);
+        if (ret < 0) {
+                if (ret != -ENOSPC)
+                        mlog_errno(ret);
+                goto leave;
+        }
+
+        BUG_ON(num_bits > clusters_to_add);
+
+        block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
+        mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
+             num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
+
+        if (prev_blkno + prev_clusters * bpc == block &&
+            (prev_clusters + num_bits) << osb->s_clustersize_bits <=
+             OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
+                /*
+                 * If this cluster is contiguous with the old one and
+                 * adding this new cluster, we don't surpass the limit of
+                 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
+                 * initialized and used like other buckets in the previous
+                 * cluster.
+                 * So add it as a contiguous one. The caller will handle
+                 * its init process.
+                 */
+                v_start = prev_cpos + prev_clusters;
+                *num_clusters = prev_clusters + num_bits;
+                mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
+                     num_bits);
+        } else {
+                ret = ocfs2_adjust_xattr_cross_cluster(inode,
+                                                       handle,
+                                                       first_bh,
+                                                       header_bh,
+                                                       block,
+                                                       prev_blkno,
+                                                       prev_clusters,
+                                                       &v_start,
+                                                       extend);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto leave;
+                }
+        }
+
+        if (handle->h_buffer_credits < credits) {
+                /*
+                 * The journal has been restarted before, and don't
+                 * have enough space for the insertion, so extend it
+                 * here.
+                 */
+                ret = ocfs2_extend_trans(handle, credits);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto leave;
+                }
+        }
+        mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
+             num_bits, block, v_start);
+        ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
+                                  num_bits, 0, meta_ac);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto leave;
+        }
+
+        ret = ocfs2_journal_dirty(handle, root_bh);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto leave;
+        }
+
+leave:
+        if (handle)
+                ocfs2_commit_trans(osb, handle);
+        if (data_ac)
+                ocfs2_free_alloc_context(data_ac);
+        if (meta_ac)
+                ocfs2_free_alloc_context(meta_ac);
+
+        return ret;
+}
+
+/*
+ * Extend a new xattr bucket and move xattrs to the end one by one until
+ * We meet with start_bh. Only move half of the xattrs to the bucket after it.
+ */
+static int ocfs2_extend_xattr_bucket(struct inode *inode,
+                                     struct buffer_head *first_bh,
+                                     struct buffer_head *start_bh,
+                                     u32 num_clusters)
+{
+        int ret, credits;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+        u64 start_blk = start_bh->b_blocknr, end_blk;
+        u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
+        handle_t *handle;
+        struct ocfs2_xattr_header *first_xh =
+                                (struct ocfs2_xattr_header *)first_bh->b_data;
+        u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
+
+        mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
+             "from %llu, len = %u\n", start_blk,
+             (unsigned long long)first_bh->b_blocknr, num_clusters);
+
+        BUG_ON(bucket >= num_buckets);
+
+        end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
+
+        /*
+         * We will touch all the buckets after the start_bh(include it).
+         * Add one more bucket and modify the first_bh.
+         */
+        credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
+        handle = ocfs2_start_trans(osb, credits);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                handle = NULL;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, first_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto commit;
+        }
+
+        while (end_blk != start_blk) {
+                ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
+                                            end_blk + blk_per_bucket, 0);
+                if (ret)
+                        goto commit;
+                end_blk -= blk_per_bucket;
+        }
+
+        /* Move half of the xattr in start_blk to the next bucket. */
+        ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
+                                      start_blk + blk_per_bucket, NULL, 0);
+
+        le16_add_cpu(&first_xh->xh_num_buckets, 1);
+        ocfs2_journal_dirty(handle, first_bh);
+
+commit:
+        ocfs2_commit_trans(osb, handle);
+out:
+        return ret;
+}
+
+/*
+ * Add new xattr bucket in an extent record and adjust the buckets accordingly.
+ * xb_bh is the ocfs2_xattr_block.
+ * We will move all the buckets starting from header_bh to the next place. As
+ * for this one, half num of its xattrs will be moved to the next one.
+ *
+ * We will allocate a new cluster if current cluster is full and adjust
+ * header_bh and first_bh if the insert place is moved to the new cluster.
+ */
+static int ocfs2_add_new_xattr_bucket(struct inode *inode,
+                                      struct buffer_head *xb_bh,
+                                      struct buffer_head *header_bh)
+{
+        struct ocfs2_xattr_header *first_xh = NULL;
+        struct buffer_head *first_bh = NULL;
+        struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)xb_bh->b_data;
+        struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
+        struct ocfs2_extent_list *el = &xb_root->xt_list;
+        struct ocfs2_xattr_header *xh =
+                        (struct ocfs2_xattr_header *)header_bh->b_data;
+        u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
+        struct super_block *sb = inode->i_sb;
+        struct ocfs2_super *osb = OCFS2_SB(sb);
+        int ret, num_buckets, extend = 1;
+        u64 p_blkno;
+        u32 e_cpos, num_clusters;
+
+        mlog(0, "Add new xattr bucket starting form %llu\n",
+             (unsigned long long)header_bh->b_blocknr);
+
+        /*
+         * Add refrence for header_bh here because it may be
+         * changed in ocfs2_add_new_xattr_cluster and we need
+         * to free it in the end.
+         */
+        get_bh(header_bh);
+
+        ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
+                                  &num_clusters, el);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_read_block(inode, p_blkno, &first_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
+        first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
+
+        if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
+                ret = ocfs2_add_new_xattr_cluster(inode,
+                                                  xb_bh,
+                                                  &first_bh,
+                                                  &header_bh,
+                                                  &num_clusters,
+                                                  e_cpos,
+                                                  p_blkno,
+                                                  &extend);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        if (extend)
+                ret = ocfs2_extend_xattr_bucket(inode,
+                                                first_bh,
+                                                header_bh,
+                                                num_clusters);
+        if (ret)
+                mlog_errno(ret);
+out:
+        brelse(first_bh);
+        brelse(header_bh);
+        return ret;
+}
+
+static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
+                                        struct ocfs2_xattr_bucket *bucket,
+                                        int offs)
+{
+        int block_off = offs >> inode->i_sb->s_blocksize_bits;
+
+        offs = offs % inode->i_sb->s_blocksize;
+        return bucket->bhs[block_off]->b_data + offs;
+}
+
+/*
+ * Handle the normal xattr set, including replace, delete and new.
+ *
+ * Note: "local" indicates the real data's locality. So we can't
+ * just its bucket locality by its length.
+ */
+static void ocfs2_xattr_set_entry_normal(struct inode *inode,
+                                         struct ocfs2_xattr_info *xi,
+                                         struct ocfs2_xattr_search *xs,
+                                         u32 name_hash,
+                                         int local)
+{
+        struct ocfs2_xattr_entry *last, *xe;
+        int name_len = strlen(xi->name);
+        struct ocfs2_xattr_header *xh = xs->header;
+        u16 count = le16_to_cpu(xh->xh_count), start;
+        size_t blocksize = inode->i_sb->s_blocksize;
+        char *val;
+        size_t offs, size, new_size;
+
+        last = &xh->xh_entries[count];
+        if (!xs->not_found) {
+                xe = xs->here;
+                offs = le16_to_cpu(xe->xe_name_offset);
+                if (ocfs2_xattr_is_local(xe))
+                        size = OCFS2_XATTR_SIZE(name_len) +
+                        OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
+                else
+                        size = OCFS2_XATTR_SIZE(name_len) +
+                        OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
+
+                /*
+                 * If the new value will be stored outside, xi->value has been
+                 * initalized as an empty ocfs2_xattr_value_root, and the same
+                 * goes with xi->value_len, so we can set new_size safely here.
+                 * See ocfs2_xattr_set_in_bucket.
+                 */
+                new_size = OCFS2_XATTR_SIZE(name_len) +
+                           OCFS2_XATTR_SIZE(xi->value_len);
+
+                le16_add_cpu(&xh->xh_name_value_len, -size);
+                if (xi->value) {
+                        if (new_size > size)
+                                goto set_new_name_value;
+
+                        /* Now replace the old value with new one. */
+                        if (local)
+                                xe->xe_value_size = cpu_to_le64(xi->value_len);
+                        else
+                                xe->xe_value_size = 0;
+
+                        val = ocfs2_xattr_bucket_get_val(inode,
+                                                         &xs->bucket, offs);
+                        memset(val + OCFS2_XATTR_SIZE(name_len), 0,
+                               size - OCFS2_XATTR_SIZE(name_len));
+                        if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
+                                memcpy(val + OCFS2_XATTR_SIZE(name_len),
+                                       xi->value, xi->value_len);
+
+                        le16_add_cpu(&xh->xh_name_value_len, new_size);
+                        ocfs2_xattr_set_local(xe, local);
+                        return;
+                } else {
+                        /*
+                         * Remove the old entry if there is more than one.
+                         * We don't remove the last entry so that we can
+                         * use it to indicate the hash value of the empty
+                         * bucket.
+                         */
+                        last -= 1;
+                        le16_add_cpu(&xh->xh_count, -1);
+                        if (xh->xh_count) {
+                                memmove(xe, xe + 1,
+                                        (void *)last - (void *)xe);
+                                memset(last, 0,
+                                       sizeof(struct ocfs2_xattr_entry));
+                        } else
+                                xh->xh_free_start =
+                                        cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
+
+                        return;
+                }
+        } else {
+                /* find a new entry for insert. */
+                int low = 0, high = count - 1, tmp;
+                struct ocfs2_xattr_entry *tmp_xe;
+
+                while (low <= high && count) {
+                        tmp = (low + high) / 2;
+                        tmp_xe = &xh->xh_entries[tmp];
+
+                        if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
+                                low = tmp + 1;
+                        else if (name_hash <
+                                 le32_to_cpu(tmp_xe->xe_name_hash))
+                                high = tmp - 1;
+                        else {
+                                low = tmp;
+                                break;
+                        }
+                }
+
+                xe = &xh->xh_entries[low];
+                if (low != count)
+                        memmove(xe + 1, xe, (void *)last - (void *)xe);
+
+                le16_add_cpu(&xh->xh_count, 1);
+                memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
+                xe->xe_name_hash = cpu_to_le32(name_hash);
+                xe->xe_name_len = name_len;
+                ocfs2_xattr_set_type(xe, xi->name_index);
+        }
+
+set_new_name_value:
+        /* Insert the new name+value. */
+        size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
+
+        /*
+         * We must make sure that the name/value pair
+         * exists in the same block.
+         */
+        offs = le16_to_cpu(xh->xh_free_start);
+        start = offs - size;
+
+        if (start >> inode->i_sb->s_blocksize_bits !=
+            (offs - 1) >> inode->i_sb->s_blocksize_bits) {
+                offs = offs - offs % blocksize;
+                xh->xh_free_start = cpu_to_le16(offs);
+        }
+
+        val = ocfs2_xattr_bucket_get_val(inode,
+                                         &xs->bucket, offs - size);
+        xe->xe_name_offset = cpu_to_le16(offs - size);
+
+        memset(val, 0, size);
+        memcpy(val, xi->name, name_len);
+        memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
+
+        xe->xe_value_size = cpu_to_le64(xi->value_len);
+        ocfs2_xattr_set_local(xe, local);
+        xs->here = xe;
+        le16_add_cpu(&xh->xh_free_start, -size);
+        le16_add_cpu(&xh->xh_name_value_len, size);
+
+        return;
+}
+
+static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
+                                             handle_t *handle,
+                                             struct ocfs2_xattr_search *xs,
+                                             struct buffer_head **bhs,
+                                             u16 bh_num)
+{
+        int ret = 0, off, block_off;
+        struct ocfs2_xattr_entry *xe = xs->here;
+
+        /*
+         * First calculate all the blocks we should journal_access
+         * and journal_dirty. The first block should always be touched.
+         */
+        ret = ocfs2_journal_dirty(handle, bhs[0]);
+        if (ret)
+                mlog_errno(ret);
+
+        /* calc the data. */
+        off = le16_to_cpu(xe->xe_name_offset);
+        block_off = off >> inode->i_sb->s_blocksize_bits;
+        ret = ocfs2_journal_dirty(handle, bhs[block_off]);
+        if (ret)
+                mlog_errno(ret);
+
+        return ret;
+}
+
+/*
+ * Set the xattr entry in the specified bucket.
+ * The bucket is indicated by xs->bucket and it should have the enough
+ * space for the xattr insertion.
+ */
+static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
+                                           struct ocfs2_xattr_info *xi,
+                                           struct ocfs2_xattr_search *xs,
+                                           u32 name_hash,
+                                           int local)
+{
+        int i, ret;
+        handle_t *handle = NULL;
+        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
+             (unsigned long)xi->value_len, xi->name_index,
+             (unsigned long long)xs->bucket.bhs[0]->b_blocknr);
+
+        if (!xs->bucket.bhs[1]) {
+                ret = ocfs2_read_blocks(inode,
+                                        xs->bucket.bhs[0]->b_blocknr + 1,
+                                        blk_per_bucket - 1, &xs->bucket.bhs[1],
+                                        OCFS2_BH_CACHED);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        handle = ocfs2_start_trans(osb, blk_per_bucket);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                handle = NULL;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        for (i = 0; i < blk_per_bucket; i++) {
+                ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
+                                           OCFS2_JOURNAL_ACCESS_WRITE);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
+
+        /*Only dirty the blocks we have touched in set xattr. */
+        ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
+                                                xs->bucket.bhs, blk_per_bucket);
+        if (ret)
+                mlog_errno(ret);
+out:
+        ocfs2_commit_trans(osb, handle);
+
+        return ret;
+}
+
+static int ocfs2_xattr_value_update_size(struct inode *inode,
+                                         struct buffer_head *xe_bh,
+                                         struct ocfs2_xattr_entry *xe,
+                                         u64 new_size)
+{
+        int ret;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        handle_t *handle = NULL;
+
+        handle = ocfs2_start_trans(osb, 1);
+        if (handle == NULL) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, xe_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret < 0) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        xe->xe_value_size = cpu_to_le64(new_size);
+
+        ret = ocfs2_journal_dirty(handle, xe_bh);
+        if (ret < 0)
+                mlog_errno(ret);
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+out:
+        return ret;
+}
+
+/*
+ * Truncate the specified xe_off entry in xattr bucket.
+ * bucket is indicated by header_bh and len is the new length.
+ * Both the ocfs2_xattr_value_root and the entry will be updated here.
+ *
+ * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
+ */
+static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
+                                             struct buffer_head *header_bh,
+                                             int xe_off,
+                                             int len)
+{
+        int ret, offset;
+        u64 value_blk;
+        struct buffer_head *value_bh = NULL;
+        struct ocfs2_xattr_value_root *xv;
+        struct ocfs2_xattr_entry *xe;
+        struct ocfs2_xattr_header *xh =
+                        (struct ocfs2_xattr_header *)header_bh->b_data;
+        size_t blocksize = inode->i_sb->s_blocksize;
+
+        xe = &xh->xh_entries[xe_off];
+
+        BUG_ON(!xe || ocfs2_xattr_is_local(xe));
+
+        offset = le16_to_cpu(xe->xe_name_offset) +
+                 OCFS2_XATTR_SIZE(xe->xe_name_len);
+
+        value_blk = offset / blocksize;
+
+        /* We don't allow ocfs2_xattr_value to be stored in different block. */
+        BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
+        value_blk += header_bh->b_blocknr;
+
+        ret = ocfs2_read_block(inode, value_blk, &value_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        xv = (struct ocfs2_xattr_value_root *)
+                (value_bh->b_data + offset % blocksize);
+
+        mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
+             xe_off, (unsigned long long)header_bh->b_blocknr, len);
+        ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+out:
+        brelse(value_bh);
+        return ret;
+}
+
+static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
+                                                struct ocfs2_xattr_search *xs,
+                                                int len)
+{
+        int ret, offset;
+        struct ocfs2_xattr_entry *xe = xs->here;
+        struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
+
+        BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
+
+        offset = xe - xh->xh_entries;
+        ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
+                                                offset, len);
+        if (ret)
+                mlog_errno(ret);
+
+        return ret;
+}
+
+static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
+                                                struct ocfs2_xattr_search *xs,
+                                                char *val,
+                                                int value_len)
+{
+        int offset;
+        struct ocfs2_xattr_value_root *xv;
+        struct ocfs2_xattr_entry *xe = xs->here;
+
+        BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
+
+        offset = le16_to_cpu(xe->xe_name_offset) +
+                 OCFS2_XATTR_SIZE(xe->xe_name_len);
+
+        xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
+
+        return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
+}
+
+static int ocfs2_rm_xattr_cluster(struct inode *inode,
+                                  struct buffer_head *root_bh,
+                                  u64 blkno,
+                                  u32 cpos,
+                                  u32 len)
+{
+        int ret;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct inode *tl_inode = osb->osb_tl_inode;
+        handle_t *handle;
+        struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)root_bh->b_data;
+        struct ocfs2_alloc_context *meta_ac = NULL;
+        struct ocfs2_cached_dealloc_ctxt dealloc;
+        struct ocfs2_extent_tree et;
+
+        ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
+
+        ocfs2_init_dealloc_ctxt(&dealloc);
+
+        mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
+             cpos, len, (unsigned long long)blkno);
+
+        ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
+
+        ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
+        if (ret) {
+                mlog_errno(ret);
+                return ret;
+        }
+
+        mutex_lock(&tl_inode->i_mutex);
+
+        if (ocfs2_truncate_log_needs_flush(osb)) {
+                ret = __ocfs2_flush_truncate_log(osb);
+                if (ret < 0) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+        }
+
+        handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
+        if (handle == NULL) {
+                ret = -ENOMEM;
+                mlog_errno(ret);
+                goto out;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, root_bh,
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
+                                  &dealloc);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
+
+        ret = ocfs2_journal_dirty(handle, root_bh);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
+        if (ret)
+                mlog_errno(ret);
+
+out_commit:
+        ocfs2_commit_trans(osb, handle);
+out:
+        ocfs2_schedule_truncate_log_flush(osb, 1);
+
+        mutex_unlock(&tl_inode->i_mutex);
+
+        if (meta_ac)
+                ocfs2_free_alloc_context(meta_ac);
+
+        ocfs2_run_deallocs(osb, &dealloc);
+
+        return ret;
+}
+
+static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
+                                         struct ocfs2_xattr_search *xs)
+{
+        handle_t *handle = NULL;
+        struct ocfs2_xattr_header *xh = xs->bucket.xh;
+        struct ocfs2_xattr_entry *last = &xh->xh_entries[
+                                                le16_to_cpu(xh->xh_count) - 1];
+        int ret = 0;
+
+        handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
+        if (IS_ERR(handle)) {
+                ret = PTR_ERR(handle);
+                mlog_errno(ret);
+                return;
+        }
+
+        ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
+                                   OCFS2_JOURNAL_ACCESS_WRITE);
+        if (ret) {
+                mlog_errno(ret);
+                goto out_commit;
+        }
+
+        /* Remove the old entry. */
+        memmove(xs->here, xs->here + 1,
+                (void *)last - (void *)xs->here);
+        memset(last, 0, sizeof(struct ocfs2_xattr_entry));
+        le16_add_cpu(&xh->xh_count, -1);
+
+        ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
+        if (ret < 0)
+                mlog_errno(ret);
+out_commit:
+        ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+}
+
+/*
+ * Set the xattr name/value in the bucket specified in xs.
+ *
+ * As the new value in xi may be stored in the bucket or in an outside cluster,
+ * we divide the whole process into 3 steps:
+ * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
+ * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
+ * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
+ * 4. If the clusters for the new outside value can't be allocated, we need
+ *    to free the xattr we allocated in set.
+ */
+static int ocfs2_xattr_set_in_bucket(struct inode *inode,
+                                     struct ocfs2_xattr_info *xi,
+                                     struct ocfs2_xattr_search *xs)
+{
+        int ret, local = 1;
+        size_t value_len;
+        char *val = (char *)xi->value;
+        struct ocfs2_xattr_entry *xe = xs->here;
+        u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
+                                              strlen(xi->name));
+
+        if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
+                /*
+                 * We need to truncate the xattr storage first.
+                 *
+                 * If both the old and new value are stored to
+                 * outside block, we only need to truncate
+                 * the storage and then set the value outside.
+                 *
+                 * If the new value should be stored within block,
+                 * we should free all the outside block first and
+                 * the modification to the xattr block will be done
+                 * by following steps.
+                 */
+                if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
+                        value_len = xi->value_len;
+                else
+                        value_len = 0;
+
+                ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
+                                                           value_len);
+                if (ret)
+                        goto out;
+
+                if (value_len)
+                        goto set_value_outside;
+        }
+
+        value_len = xi->value_len;
+        /* So we have to handle the inside block change now. */
+        if (value_len > OCFS2_XATTR_INLINE_SIZE) {
+                /*
+                 * If the new value will be stored outside of block,
+                 * initalize a new empty value root and insert it first.
+                 */
+                local = 0;
+                xi->value = &def_xv;
+                xi->value_len = OCFS2_XATTR_ROOT_SIZE;
+        }
+
+        ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        if (value_len <= OCFS2_XATTR_INLINE_SIZE)
+                goto out;
+
+        /* allocate the space now for the outside block storage. */
+        ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
+                                                   value_len);
+        if (ret) {
+                mlog_errno(ret);
+
+                if (xs->not_found) {
+                        /*
+                         * We can't allocate enough clusters for outside
+                         * storage and we have allocated xattr already,
+                         * so need to remove it.
+                         */
+                        ocfs2_xattr_bucket_remove_xs(inode, xs);
+                }
+                goto out;
+        }
+
+set_value_outside:
+        ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
+out:
+        return ret;
+}
+
+/* check whether the xattr bucket is filled up with the same hash value. */
+static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
+                                              struct ocfs2_xattr_bucket *bucket)
+{
+        struct ocfs2_xattr_header *xh = bucket->xh;
+
+        if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
+            xh->xh_entries[0].xe_name_hash) {
+                mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
+                     "hash = %u\n",
+                     (unsigned long long)bucket->bhs[0]->b_blocknr,
+                     le32_to_cpu(xh->xh_entries[0].xe_name_hash));
+                return -ENOSPC;
+        }
+
+        return 0;
+}
+
+static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
+                                             struct ocfs2_xattr_info *xi,
+                                             struct ocfs2_xattr_search *xs)
+{
+        struct ocfs2_xattr_header *xh;
+        struct ocfs2_xattr_entry *xe;
+        u16 count, header_size, xh_free_start;
+        int i, free, max_free, need, old;
+        size_t value_size = 0, name_len = strlen(xi->name);
+        size_t blocksize = inode->i_sb->s_blocksize;
+        int ret, allocation = 0;
+        u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
+
+        mlog_entry("Set xattr %s in xattr index block\n", xi->name);
+
+try_again:
+        xh = xs->header;
+        count = le16_to_cpu(xh->xh_count);
+        xh_free_start = le16_to_cpu(xh->xh_free_start);
+        header_size = sizeof(struct ocfs2_xattr_header) +
+                        count * sizeof(struct ocfs2_xattr_entry);
+        max_free = OCFS2_XATTR_BUCKET_SIZE -
+                le16_to_cpu(xh->xh_name_value_len) - header_size;
+
+        mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
+                        "of %u which exceed block size\n",
+                        (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
+                        header_size);
+
+        if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
+                value_size = OCFS2_XATTR_ROOT_SIZE;
+        else if (xi->value)
+                value_size = OCFS2_XATTR_SIZE(xi->value_len);
+
+        if (xs->not_found)
+                need = sizeof(struct ocfs2_xattr_entry) +
+                        OCFS2_XATTR_SIZE(name_len) + value_size;
+        else {
+                need = value_size + OCFS2_XATTR_SIZE(name_len);
+
+                /*
+                 * We only replace the old value if the new length is smaller
+                 * than the old one. Otherwise we will allocate new space in the
+                 * bucket to store it.
+                 */
+                xe = xs->here;
+                if (ocfs2_xattr_is_local(xe))
+                        old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
+                else
+                        old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
+
+                if (old >= value_size)
+                        need = 0;
+        }
+
+        free = xh_free_start - header_size;
+        /*
+         * We need to make sure the new name/value pair
+         * can exist in the same block.
+         */
+        if (xh_free_start % blocksize < need)
+                free -= xh_free_start % blocksize;
+
+        mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
+             "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
+             " %u\n", xs->not_found,
+             (unsigned long long)xs->bucket.bhs[0]->b_blocknr,
+             free, need, max_free, le16_to_cpu(xh->xh_free_start),
+             le16_to_cpu(xh->xh_name_value_len));
+
+        if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
+                if (need <= max_free &&
+                    count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
+                        /*
+                         * We can create the space by defragment. Since only the
+                         * name/value will be moved, the xe shouldn't be changed
+                         * in xs.
+                         */
+                        ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
+                        if (ret) {
+                                mlog_errno(ret);
+                                goto out;
+                        }
+
+                        xh_free_start = le16_to_cpu(xh->xh_free_start);
+                        free = xh_free_start - header_size;
+                        if (xh_free_start % blocksize < need)
+                                free -= xh_free_start % blocksize;
+
+                        if (free >= need)
+                                goto xattr_set;
+
+                        mlog(0, "Can't get enough space for xattr insert by "
+                             "defragment. Need %u bytes, but we have %d, so "
+                             "allocate new bucket for it.\n", need, free);
+                }
+
+                /*
+                 * We have to add new buckets or clusters and one
+                 * allocation should leave us enough space for insert.
+                 */
+                BUG_ON(allocation);
+
+                /*
+                 * We do not allow for overlapping ranges between buckets. And
+                 * the maximum number of collisions we will allow for then is
+                 * one bucket's worth, so check it here whether we need to
+                 * add a new bucket for the insert.
+                 */
+                ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                ret = ocfs2_add_new_xattr_bucket(inode,
+                                                 xs->xattr_bh,
+                                                 xs->bucket.bhs[0]);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                for (i = 0; i < blk_per_bucket; i++)
+                        brelse(xs->bucket.bhs[i]);
+
+                memset(&xs->bucket, 0, sizeof(xs->bucket));
+
+                ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
+                                                   xi->name_index,
+                                                   xi->name, xs);
+                if (ret && ret != -ENODATA)
+                        goto out;
+                xs->not_found = ret;
+                allocation = 1;
+                goto try_again;
+        }
+
+xattr_set:
+        ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
+out:
+        mlog_exit(ret);
+        return ret;
+}
+
+static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
+                                        struct ocfs2_xattr_bucket *bucket,
+                                        void *para)
+{
+        int ret = 0;
+        struct ocfs2_xattr_header *xh = bucket->xh;
+        u16 i;
+        struct ocfs2_xattr_entry *xe;
+
+        for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
+                xe = &xh->xh_entries[i];
+                if (ocfs2_xattr_is_local(xe))
+                        continue;
+
+                ret = ocfs2_xattr_bucket_value_truncate(inode,
+                                                        bucket->bhs[0],
+                                                        i, 0);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+        }
+
+        return ret;
+}
+
+static int ocfs2_delete_xattr_index_block(struct inode *inode,
+                                          struct buffer_head *xb_bh)
+{
+        struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)xb_bh->b_data;
+        struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
+        int ret = 0;
+        u32 name_hash = UINT_MAX, e_cpos, num_clusters;
+        u64 p_blkno;
+
+        if (le16_to_cpu(el->l_next_free_rec) == 0)
+                return 0;
+
+        while (name_hash > 0) {
+                ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
+                                          &e_cpos, &num_clusters, el);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
+                                                  ocfs2_delete_xattr_in_bucket,
+                                                  NULL);
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
+
+                ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
+                                             p_blkno, e_cpos, num_clusters);
+                if (ret) {
+                        mlog_errno(ret);
+                        break;
+                }
+
+                if (e_cpos == 0)
+                        break;
+
+                name_hash = e_cpos - 1;
+        }
+
+out:
+        return ret;
+}
+
+/*
+ * 'trusted' attributes support
+ */
+
+#define XATTR_TRUSTED_PREFIX "trusted."
+
+static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
+                                       size_t list_size, const char *name,
+                                       size_t name_len)
+{
+        const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX) - 1;
+        const size_t total_len = prefix_len + name_len + 1;
+
+        if (list && total_len <= list_size) {
+                memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
+                memcpy(list + prefix_len, name, name_len);
+                list[prefix_len + name_len] = '\0';
+        }
+        return total_len;
+}
+
+static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
+                                   void *buffer, size_t size)
+{
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+        return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
+                               buffer, size);
+}
+
+static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
+                                   const void *value, size_t size, int flags)
+{
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+
+        return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
+                               size, flags);
+}
+
+struct xattr_handler ocfs2_xattr_trusted_handler = {
+        .prefix = XATTR_TRUSTED_PREFIX,
+        .list   = ocfs2_xattr_trusted_list,
+        .get    = ocfs2_xattr_trusted_get,
+        .set    = ocfs2_xattr_trusted_set,
+};
+
+
+/*
+ * 'user' attributes support
+ */
+
+#define XATTR_USER_PREFIX "user."
+
+static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
+                                    size_t list_size, const char *name,
+                                    size_t name_len)
+{
+        const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1;
+        const size_t total_len = prefix_len + name_len + 1;
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
+                return 0;
+
+        if (list && total_len <= list_size) {
+                memcpy(list, XATTR_USER_PREFIX, prefix_len);
+                memcpy(list + prefix_len, name, name_len);
+                list[prefix_len + name_len] = '\0';
+        }
+        return total_len;
+}
+
+static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
+                                void *buffer, size_t size)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+        if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
+                return -EOPNOTSUPP;
+        return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
+                               buffer, size);
+}
+
+static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
+                                const void *value, size_t size, int flags)
+{
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+        if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
+                return -EOPNOTSUPP;
+
+        return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
+                               size, flags);
+}
+
+struct xattr_handler ocfs2_xattr_user_handler = {
+        .prefix = XATTR_USER_PREFIX,
+        .list   = ocfs2_xattr_user_list,
+        .get    = ocfs2_xattr_user_get,
+        .set    = ocfs2_xattr_user_set,
+};
diff --git a/fs/ocfs2/xattr.h b/fs/ocfs2/xattr.h
new file mode 100644
index 000000000000..c25c7c62a059
--- /dev/null
+++ b/fs/ocfs2/xattr.h
@@ -0,0 +1,68 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * xattr.h
+ *
+ * Function prototypes
+ *
+ * Copyright (C) 2008 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef OCFS2_XATTR_H
+#define OCFS2_XATTR_H
+
+#include <linux/init.h>
+#include <linux/xattr.h>
+
+enum ocfs2_xattr_type {
+        OCFS2_XATTR_INDEX_USER = 1,
+        OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS,
+        OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
+        OCFS2_XATTR_INDEX_TRUSTED,
+        OCFS2_XATTR_INDEX_SECURITY,
+        OCFS2_XATTR_MAX
+};
+
+extern struct xattr_handler ocfs2_xattr_user_handler;
+extern struct xattr_handler ocfs2_xattr_trusted_handler;
+
+extern ssize_t ocfs2_listxattr(struct dentry *, char *, size_t);
+extern int ocfs2_xattr_get(struct inode *, int, const char *, void *, size_t);
+extern int ocfs2_xattr_set(struct inode *, int, const char *, const void *,
+                           size_t, int);
+extern int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh);
+extern struct xattr_handler *ocfs2_xattr_handlers[];
+
+static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
+{
+        return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
+}
+
+static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
+{
+        return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
+}
+
+static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
+{
+        u16 len = sb->s_blocksize -
+                 offsetof(struct ocfs2_xattr_header, xh_entries);
+
+        return len / sizeof(struct ocfs2_xattr_entry);
+}
+#endif /* OCFS2_XATTR_H */