Merge commit 'origin/master' into next

51 files changed, 1091 insertions, 358 deletions

diff --git a/fs/Makefile b/fs/Makefile
index 38bc735c67ad..dc20db348679 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -69,10 +69,12 @@ obj-$(CONFIG_DLM)		+= dlm/
 # Do not add any filesystems before this line
 obj-$(CONFIG_REISERFS_FS)       += reiserfs/
 obj-$(CONFIG_EXT3_FS)           += ext3/ # Before ext2 so root fs can be ext3
-obj-$(CONFIG_EXT4_FS)           += ext4/ # Before ext2 so root fs can be ext4
+obj-$(CONFIG_EXT2_FS)           += ext2/
+# We place ext4 after ext2 so plain ext2 root fs's are mounted using ext2
+# unless explicitly requested by rootfstype
+obj-$(CONFIG_EXT4_FS)           += ext4/
 obj-$(CONFIG_JBD)               += jbd/
 obj-$(CONFIG_JBD2)              += jbd2/
-obj-$(CONFIG_EXT2_FS)           += ext2/
 obj-$(CONFIG_CRAMFS)            += cramfs/
 obj-$(CONFIG_SQUASHFS)          += squashfs/
 obj-y                           += ramfs/
diff --git a/fs/bio.c b/fs/bio.c
index 062299acbccd..124b95c4d582 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -302,9 +302,10 @@ void bio_init(struct bio *bio)
 struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
 {
         struct bio *bio = NULL;
+        void *uninitialized_var(p);
 
         if (bs) {
-                void *p = mempool_alloc(bs->bio_pool, gfp_mask);
+                p = mempool_alloc(bs->bio_pool, gfp_mask);
 
                 if (p)
                         bio = p + bs->front_pad;
@@ -329,7 +330,7 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
                         }
                         if (unlikely(!bvl)) {
                                 if (bs)
-                                        mempool_free(bio, bs->bio_pool);
+                                        mempool_free(p, bs->bio_pool);
                                 else
                                         kfree(bio);
                                 bio = NULL;
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index a8c9693b75ac..72677ce2b74f 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -66,6 +66,9 @@ struct btrfs_inode {
          */
         struct list_head delalloc_inodes;
 
+        /* the space_info for where this inode's data allocations are done */
+        struct btrfs_space_info *space_info;
+
         /* full 64 bit generation number, struct vfs_inode doesn't have a big
          * enough field for this.
          */
@@ -94,6 +97,11 @@ struct btrfs_inode {
          */
         u64 delalloc_bytes;
 
+        /* total number of bytes that may be used for this inode for
+         * delalloc
+         */
+        u64 reserved_bytes;
+
         /*
          * the size of the file stored in the metadata on disk.  data=ordered
          * means the in-memory i_size might be larger than the size on disk
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 42491d728e99..37f31b5529aa 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -277,7 +277,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
         if (*cow_ret == buf)
                 unlock_orig = 1;
 
-        WARN_ON(!btrfs_tree_locked(buf));
+        btrfs_assert_tree_locked(buf);
 
         if (parent)
                 parent_start = parent->start;
@@ -2365,7 +2365,7 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
         if (slot >= btrfs_header_nritems(upper) - 1)
                 return 1;
 
-        WARN_ON(!btrfs_tree_locked(path->nodes[1]));
+        btrfs_assert_tree_locked(path->nodes[1]);
 
         right = read_node_slot(root, upper, slot + 1);
         btrfs_tree_lock(right);
@@ -2562,7 +2562,7 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
         if (right_nritems == 0)
                 return 1;
 
-        WARN_ON(!btrfs_tree_locked(path->nodes[1]));
+        btrfs_assert_tree_locked(path->nodes[1]);
 
         left = read_node_slot(root, path->nodes[1], slot - 1);
         btrfs_tree_lock(left);
@@ -4101,7 +4101,7 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
 
                 next = read_node_slot(root, c, slot);
                 if (!path->skip_locking) {
-                        WARN_ON(!btrfs_tree_locked(c));
+                        btrfs_assert_tree_locked(c);
                         btrfs_tree_lock(next);
                         btrfs_set_lock_blocking(next);
                 }
@@ -4126,7 +4126,7 @@ int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path)
                         reada_for_search(root, path, level, slot, 0);
                 next = read_node_slot(root, next, 0);
                 if (!path->skip_locking) {
-                        WARN_ON(!btrfs_tree_locked(path->nodes[level]));
+                        btrfs_assert_tree_locked(path->nodes[level]);
                         btrfs_tree_lock(next);
                         btrfs_set_lock_blocking(next);
                 }
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 766b31ae3186..82491ba8fa40 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -596,13 +596,27 @@ struct btrfs_block_group_item {
 
 struct btrfs_space_info {
         u64 flags;
-        u64 total_bytes;
-        u64 bytes_used;
-        u64 bytes_pinned;
-        u64 bytes_reserved;
-        u64 bytes_readonly;
-        int full;
-        int force_alloc;
+
+        u64 total_bytes;        /* total bytes in the space */
+        u64 bytes_used;         /* total bytes used on disk */
+        u64 bytes_pinned;       /* total bytes pinned, will be freed when the
+                                   transaction finishes */
+        u64 bytes_reserved;     /* total bytes the allocator has reserved for
+                                   current allocations */
+        u64 bytes_readonly;     /* total bytes that are read only */
+
+        /* delalloc accounting */
+        u64 bytes_delalloc;     /* number of bytes reserved for allocation,
+                                   this space is not necessarily reserved yet
+                                   by the allocator */
+        u64 bytes_may_use;      /* number of bytes that may be used for
+                                   delalloc */
+
+        int full;               /* indicates that we cannot allocate any more
+                                   chunks for this space */
+        int force_alloc;        /* set if we need to force a chunk alloc for
+                                   this space */
+
         struct list_head list;
 
         /* for block groups in our same type */
@@ -1782,6 +1796,16 @@ int btrfs_add_dead_reloc_root(struct btrfs_root *root);
 int btrfs_cleanup_reloc_trees(struct btrfs_root *root);
 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
+void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
+int btrfs_check_metadata_free_space(struct btrfs_root *root);
+int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
+                                u64 bytes);
+void btrfs_free_reserved_data_space(struct btrfs_root *root,
+                                    struct inode *inode, u64 bytes);
+void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
+                                 u64 bytes);
+void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
+                              u64 bytes);
 /* ctree.c */
 int btrfs_previous_item(struct btrfs_root *root,
                         struct btrfs_path *path, u64 min_objectid,
@@ -2027,8 +2051,6 @@ int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
 unsigned long btrfs_force_ra(struct address_space *mapping,
                               struct file_ra_state *ra, struct file *file,
                               pgoff_t offset, pgoff_t last_index);
-int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
-                           int for_del);
 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
 int btrfs_readpage(struct file *file, struct page *page);
 void btrfs_delete_inode(struct inode *inode);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index adda739a0215..3e18175248e0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -857,7 +857,7 @@ int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
         struct inode *btree_inode = root->fs_info->btree_inode;
         if (btrfs_header_generation(buf) ==
             root->fs_info->running_transaction->transid) {
-                WARN_ON(!btrfs_tree_locked(buf));
+                btrfs_assert_tree_locked(buf);
 
                 /* ugh, clear_extent_buffer_dirty can be expensive */
                 btrfs_set_lock_blocking(buf);
@@ -2361,7 +2361,7 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
 
         btrfs_set_lock_blocking(buf);
 
-        WARN_ON(!btrfs_tree_locked(buf));
+        btrfs_assert_tree_locked(buf);
         if (transid != root->fs_info->generation) {
                 printk(KERN_CRIT "btrfs transid mismatch buffer %llu, "
                        "found %llu running %llu\n",
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 0a5d796c9f7e..9abf81f71c46 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -60,6 +60,10 @@ static int update_block_group(struct btrfs_trans_handle *trans,
                               u64 bytenr, u64 num_bytes, int alloc,
                               int mark_free);
 
+static int do_chunk_alloc(struct btrfs_trans_handle *trans,
+                          struct btrfs_root *extent_root, u64 alloc_bytes,
+                          u64 flags, int force);
+
 static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
 {
         return (cache->flags & bits) == bits;
@@ -1909,6 +1913,7 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
         found->bytes_pinned = 0;
         found->bytes_reserved = 0;
         found->bytes_readonly = 0;
+        found->bytes_delalloc = 0;
         found->full = 0;
         found->force_alloc = 0;
         *space_info = found;
@@ -1972,6 +1977,233 @@ u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags)
         return flags;
 }
 
+static u64 btrfs_get_alloc_profile(struct btrfs_root *root, u64 data)
+{
+        struct btrfs_fs_info *info = root->fs_info;
+        u64 alloc_profile;
+
+        if (data) {
+                alloc_profile = info->avail_data_alloc_bits &
+                        info->data_alloc_profile;
+                data = BTRFS_BLOCK_GROUP_DATA | alloc_profile;
+        } else if (root == root->fs_info->chunk_root) {
+                alloc_profile = info->avail_system_alloc_bits &
+                        info->system_alloc_profile;
+                data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile;
+        } else {
+                alloc_profile = info->avail_metadata_alloc_bits &
+                        info->metadata_alloc_profile;
+                data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
+        }
+
+        return btrfs_reduce_alloc_profile(root, data);
+}
+
+void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode)
+{
+        u64 alloc_target;
+
+        alloc_target = btrfs_get_alloc_profile(root, 1);
+        BTRFS_I(inode)->space_info = __find_space_info(root->fs_info,
+                                                       alloc_target);
+}
+
+/*
+ * for now this just makes sure we have at least 5% of our metadata space free
+ * for use.
+ */
+int btrfs_check_metadata_free_space(struct btrfs_root *root)
+{
+        struct btrfs_fs_info *info = root->fs_info;
+        struct btrfs_space_info *meta_sinfo;
+        u64 alloc_target, thresh;
+        int committed = 0, ret;
+
+        /* get the space info for where the metadata will live */
+        alloc_target = btrfs_get_alloc_profile(root, 0);
+        meta_sinfo = __find_space_info(info, alloc_target);
+
+again:
+        spin_lock(&meta_sinfo->lock);
+        if (!meta_sinfo->full)
+                thresh = meta_sinfo->total_bytes * 80;
+        else
+                thresh = meta_sinfo->total_bytes * 95;
+
+        do_div(thresh, 100);
+
+        if (meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
+            meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly > thresh) {
+                struct btrfs_trans_handle *trans;
+                if (!meta_sinfo->full) {
+                        meta_sinfo->force_alloc = 1;
+                        spin_unlock(&meta_sinfo->lock);
+
+                        trans = btrfs_start_transaction(root, 1);
+                        if (!trans)
+                                return -ENOMEM;
+
+                        ret = do_chunk_alloc(trans, root->fs_info->extent_root,
+                                             2 * 1024 * 1024, alloc_target, 0);
+                        btrfs_end_transaction(trans, root);
+                        goto again;
+                }
+                spin_unlock(&meta_sinfo->lock);
+
+                if (!committed) {
+                        committed = 1;
+                        trans = btrfs_join_transaction(root, 1);
+                        if (!trans)
+                                return -ENOMEM;
+                        ret = btrfs_commit_transaction(trans, root);
+                        if (ret)
+                                return ret;
+                        goto again;
+                }
+                return -ENOSPC;
+        }
+        spin_unlock(&meta_sinfo->lock);
+
+        return 0;
+}
+
+/*
+ * This will check the space that the inode allocates from to make sure we have
+ * enough space for bytes.
+ */
+int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
+                                u64 bytes)
+{
+        struct btrfs_space_info *data_sinfo;
+        int ret = 0, committed = 0;
+
+        /* make sure bytes are sectorsize aligned */
+        bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
+
+        data_sinfo = BTRFS_I(inode)->space_info;
+again:
+        /* make sure we have enough space to handle the data first */
+        spin_lock(&data_sinfo->lock);
+        if (data_sinfo->total_bytes - data_sinfo->bytes_used -
+            data_sinfo->bytes_delalloc - data_sinfo->bytes_reserved -
+            data_sinfo->bytes_pinned - data_sinfo->bytes_readonly -
+            data_sinfo->bytes_may_use < bytes) {
+                struct btrfs_trans_handle *trans;
+
+                /*
+                 * if we don't have enough free bytes in this space then we need
+                 * to alloc a new chunk.
+                 */
+                if (!data_sinfo->full) {
+                        u64 alloc_target;
+
+                        data_sinfo->force_alloc = 1;
+                        spin_unlock(&data_sinfo->lock);
+
+                        alloc_target = btrfs_get_alloc_profile(root, 1);
+                        trans = btrfs_start_transaction(root, 1);
+                        if (!trans)
+                                return -ENOMEM;
+
+                        ret = do_chunk_alloc(trans, root->fs_info->extent_root,
+                                             bytes + 2 * 1024 * 1024,
+                                             alloc_target, 0);
+                        btrfs_end_transaction(trans, root);
+                        if (ret)
+                                return ret;
+                        goto again;
+                }
+                spin_unlock(&data_sinfo->lock);
+
+                /* commit the current transaction and try again */
+                if (!committed) {
+                        committed = 1;
+                        trans = btrfs_join_transaction(root, 1);
+                        if (!trans)
+                                return -ENOMEM;
+                        ret = btrfs_commit_transaction(trans, root);
+                        if (ret)
+                                return ret;
+                        goto again;
+                }
+
+                printk(KERN_ERR "no space left, need %llu, %llu delalloc bytes"
+                       ", %llu bytes_used, %llu bytes_reserved, "
+                       "%llu bytes_pinned, %llu bytes_readonly, %llu may use"
+                       "%llu total\n", bytes, data_sinfo->bytes_delalloc,
+                       data_sinfo->bytes_used, data_sinfo->bytes_reserved,
+                       data_sinfo->bytes_pinned, data_sinfo->bytes_readonly,
+                       data_sinfo->bytes_may_use, data_sinfo->total_bytes);
+                return -ENOSPC;
+        }
+        data_sinfo->bytes_may_use += bytes;
+        BTRFS_I(inode)->reserved_bytes += bytes;
+        spin_unlock(&data_sinfo->lock);
+
+        return btrfs_check_metadata_free_space(root);
+}
+
+/*
+ * if there was an error for whatever reason after calling
+ * btrfs_check_data_free_space, call this so we can cleanup the counters.
+ */
+void btrfs_free_reserved_data_space(struct btrfs_root *root,
+                                    struct inode *inode, u64 bytes)
+{
+        struct btrfs_space_info *data_sinfo;
+
+        /* make sure bytes are sectorsize aligned */
+        bytes = (bytes + root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
+
+        data_sinfo = BTRFS_I(inode)->space_info;
+        spin_lock(&data_sinfo->lock);
+        data_sinfo->bytes_may_use -= bytes;
+        BTRFS_I(inode)->reserved_bytes -= bytes;
+        spin_unlock(&data_sinfo->lock);
+}
+
+/* called when we are adding a delalloc extent to the inode's io_tree */
+void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
+                                  u64 bytes)
+{
+        struct btrfs_space_info *data_sinfo;
+
+        /* get the space info for where this inode will be storing its data */
+        data_sinfo = BTRFS_I(inode)->space_info;
+
+        /* make sure we have enough space to handle the data first */
+        spin_lock(&data_sinfo->lock);
+        data_sinfo->bytes_delalloc += bytes;
+
+        /*
+         * we are adding a delalloc extent without calling
+         * btrfs_check_data_free_space first.  This happens on a weird
+         * writepage condition, but shouldn't hurt our accounting
+         */
+        if (unlikely(bytes > BTRFS_I(inode)->reserved_bytes)) {
+                data_sinfo->bytes_may_use -= BTRFS_I(inode)->reserved_bytes;
+                BTRFS_I(inode)->reserved_bytes = 0;
+        } else {
+                data_sinfo->bytes_may_use -= bytes;
+                BTRFS_I(inode)->reserved_bytes -= bytes;
+        }
+
+        spin_unlock(&data_sinfo->lock);
+}
+
+/* called when we are clearing an delalloc extent from the inode's io_tree */
+void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
+                              u64 bytes)
+{
+        struct btrfs_space_info *info;
+
+        info = BTRFS_I(inode)->space_info;
+
+        spin_lock(&info->lock);
+        info->bytes_delalloc -= bytes;
+        spin_unlock(&info->lock);
+}
+
 static int do_chunk_alloc(struct btrfs_trans_handle *trans,
                           struct btrfs_root *extent_root, u64 alloc_bytes,
                           u64 flags, int force)
@@ -3105,6 +3337,10 @@ static void dump_space_info(struct btrfs_space_info *info, u64 bytes)
                (unsigned long long)(info->total_bytes - info->bytes_used -
                                     info->bytes_pinned - info->bytes_reserved),
                (info->full) ? "" : "not ");
+        printk(KERN_INFO "space_info total=%llu, pinned=%llu, delalloc=%llu,"
+               " may_use=%llu, used=%llu\n", info->total_bytes,
+               info->bytes_pinned, info->bytes_delalloc, info->bytes_may_use,
+               info->bytes_used);
 
         down_read(&info->groups_sem);
         list_for_each_entry(cache, &info->block_groups, list) {
@@ -3131,24 +3367,10 @@ static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans,
 {
         int ret;
         u64 search_start = 0;
-        u64 alloc_profile;
         struct btrfs_fs_info *info = root->fs_info;
 
-        if (data) {
-                alloc_profile = info->avail_data_alloc_bits &
-                        info->data_alloc_profile;
-                data = BTRFS_BLOCK_GROUP_DATA | alloc_profile;
-        } else if (root == root->fs_info->chunk_root) {
-                alloc_profile = info->avail_system_alloc_bits &
-                        info->system_alloc_profile;
-                data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile;
-        } else {
-                alloc_profile = info->avail_metadata_alloc_bits &
-                        info->metadata_alloc_profile;
-                data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
-        }
+        data = btrfs_get_alloc_profile(root, data);
 again:
-        data = btrfs_reduce_alloc_profile(root, data);
         /*
          * the only place that sets empty_size is btrfs_realloc_node, which
          * is not called recursively on allocations
@@ -4196,13 +4418,13 @@ int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
         path = btrfs_alloc_path();
         BUG_ON(!path);
 
-        BUG_ON(!btrfs_tree_locked(parent));
+        btrfs_assert_tree_locked(parent);
         parent_level = btrfs_header_level(parent);
         extent_buffer_get(parent);
         path->nodes[parent_level] = parent;
         path->slots[parent_level] = btrfs_header_nritems(parent);
 
-        BUG_ON(!btrfs_tree_locked(node));
+        btrfs_assert_tree_locked(node);
         level = btrfs_header_level(node);
         extent_buffer_get(node);
         path->nodes[level] = node;
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 3e8023efaff7..dc78954861b3 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1091,19 +1091,24 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
                 WARN_ON(num_pages > nrptrs);
                 memset(pages, 0, sizeof(struct page *) * nrptrs);
 
-                ret = btrfs_check_free_space(root, write_bytes, 0);
+                ret = btrfs_check_data_free_space(root, inode, write_bytes);
                 if (ret)
                         goto out;
 
                 ret = prepare_pages(root, file, pages, num_pages,
                                     pos, first_index, last_index,
                                     write_bytes);
-                if (ret)
+                if (ret) {
+                        btrfs_free_reserved_data_space(root, inode,
+                                                       write_bytes);
                         goto out;
+                }
 
                 ret = btrfs_copy_from_user(pos, num_pages,
                                            write_bytes, pages, buf);
                 if (ret) {
+                        btrfs_free_reserved_data_space(root, inode,
+                                                       write_bytes);
                         btrfs_drop_pages(pages, num_pages);
                         goto out;
                 }
@@ -1111,8 +1116,11 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
                 ret = dirty_and_release_pages(NULL, root, file, pages,
                                               num_pages, pos, write_bytes);
                 btrfs_drop_pages(pages, num_pages);
-                if (ret)
+                if (ret) {
+                        btrfs_free_reserved_data_space(root, inode,
+                                                       write_bytes);
                         goto out;
+                }
 
                 if (will_write) {
                         btrfs_fdatawrite_range(inode->i_mapping, pos,
@@ -1136,6 +1144,8 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
         }
 out:
         mutex_unlock(&inode->i_mutex);
+        if (ret)
+                err = ret;
 
 out_nolock:
         kfree(pages);
@@ -1222,7 +1232,7 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
         /*
          * ok we haven't committed the transaction yet, lets do a commit
          */
-        if (file->private_data)
+        if (file && file->private_data)
                 btrfs_ioctl_trans_end(file);
 
         trans = btrfs_start_transaction(root, 1);
@@ -1231,7 +1241,7 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
                 goto out;
         }
 
-        ret = btrfs_log_dentry_safe(trans, root, file->f_dentry);
+        ret = btrfs_log_dentry_safe(trans, root, dentry);
         if (ret < 0)
                 goto out;
 
@@ -1245,7 +1255,7 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
          * file again, but that will end up using the synchronization
          * inside btrfs_sync_log to keep things safe.
          */
-        mutex_unlock(&file->f_dentry->d_inode->i_mutex);
+        mutex_unlock(&dentry->d_inode->i_mutex);
 
         if (ret > 0) {
                 ret = btrfs_commit_transaction(trans, root);
@@ -1253,7 +1263,7 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
                 btrfs_sync_log(trans, root);
                 ret = btrfs_end_transaction(trans, root);
         }
-        mutex_lock(&file->f_dentry->d_inode->i_mutex);
+        mutex_lock(&dentry->d_inode->i_mutex);
 out:
         return ret > 0 ? EIO : ret;
 }
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3cee77ae03c8..7d4f948bc22a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -102,34 +102,6 @@ static int btrfs_init_inode_security(struct inode *inode,  struct inode *dir)
 }
 
 /*
- * a very lame attempt at stopping writes when the FS is 85% full.  There
- * are countless ways this is incorrect, but it is better than nothing.
- */
-int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
-                           int for_del)
-{
-        u64 total;
-        u64 used;
-        u64 thresh;
-        int ret = 0;
-
-        spin_lock(&root->fs_info->delalloc_lock);
-        total = btrfs_super_total_bytes(&root->fs_info->super_copy);
-        used = btrfs_super_bytes_used(&root->fs_info->super_copy);
-        if (for_del)
-                thresh = total * 90;
-        else
-                thresh = total * 85;
-
-        do_div(thresh, 100);
-
-        if (used + root->fs_info->delalloc_bytes + num_required > thresh)
-                ret = -ENOSPC;
-        spin_unlock(&root->fs_info->delalloc_lock);
-        return ret;
-}
-
-/*
  * this does all the hard work for inserting an inline extent into
  * the btree.  The caller should have done a btrfs_drop_extents so that
  * no overlapping inline items exist in the btree
@@ -1190,6 +1162,7 @@ static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
          */
         if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
                 struct btrfs_root *root = BTRFS_I(inode)->root;
+                btrfs_delalloc_reserve_space(root, inode, end - start + 1);
                 spin_lock(&root->fs_info->delalloc_lock);
                 BTRFS_I(inode)->delalloc_bytes += end - start + 1;
                 root->fs_info->delalloc_bytes += end - start + 1;
@@ -1223,9 +1196,12 @@ static int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
                                (unsigned long long)end - start + 1,
                                (unsigned long long)
                                root->fs_info->delalloc_bytes);
+                        btrfs_delalloc_free_space(root, inode, (u64)-1);
                         root->fs_info->delalloc_bytes = 0;
                         BTRFS_I(inode)->delalloc_bytes = 0;
                 } else {
+                        btrfs_delalloc_free_space(root, inode,
+                                                  end - start + 1);
                         root->fs_info->delalloc_bytes -= end - start + 1;
                         BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
                 }
@@ -2245,10 +2221,6 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
 
         root = BTRFS_I(dir)->root;
 
-        ret = btrfs_check_free_space(root, 1, 1);
-        if (ret)
-                goto fail;
-
         trans = btrfs_start_transaction(root, 1);
 
         btrfs_set_trans_block_group(trans, dir);
@@ -2261,7 +2233,6 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
         nr = trans->blocks_used;
 
         btrfs_end_transaction_throttle(trans, root);
-fail:
         btrfs_btree_balance_dirty(root, nr);
         return ret;
 }
@@ -2284,10 +2255,6 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
                 return -ENOTEMPTY;
         }
 
-        ret = btrfs_check_free_space(root, 1, 1);
-        if (ret)
-                goto fail;
-
         trans = btrfs_start_transaction(root, 1);
         btrfs_set_trans_block_group(trans, dir);
 
@@ -2304,7 +2271,6 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
 fail_trans:
         nr = trans->blocks_used;
         ret = btrfs_end_transaction_throttle(trans, root);
-fail:
         btrfs_btree_balance_dirty(root, nr);
 
         if (ret && !err)
@@ -2818,7 +2784,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
         if (size <= hole_start)
                 return 0;
 
-        err = btrfs_check_free_space(root, 1, 0);
+        err = btrfs_check_metadata_free_space(root);
         if (err)
                 return err;
 
@@ -3014,6 +2980,7 @@ static noinline void init_btrfs_i(struct inode *inode)
         bi->last_trans = 0;
         bi->logged_trans = 0;
         bi->delalloc_bytes = 0;
+        bi->reserved_bytes = 0;
         bi->disk_i_size = 0;
         bi->flags = 0;
         bi->index_cnt = (u64)-1;
@@ -3035,6 +3002,7 @@ static int btrfs_init_locked_inode(struct inode *inode, void *p)
         inode->i_ino = args->ino;
         init_btrfs_i(inode);
         BTRFS_I(inode)->root = args->root;
+        btrfs_set_inode_space_info(args->root, inode);
         return 0;
 }
 
@@ -3455,6 +3423,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
         BTRFS_I(inode)->index_cnt = 2;
         BTRFS_I(inode)->root = root;
         BTRFS_I(inode)->generation = trans->transid;
+        btrfs_set_inode_space_info(root, inode);
 
         if (mode & S_IFDIR)
                 owner = 0;
@@ -3602,7 +3571,7 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
         if (!new_valid_dev(rdev))
                 return -EINVAL;
 
-        err = btrfs_check_free_space(root, 1, 0);
+        err = btrfs_check_metadata_free_space(root);
         if (err)
                 goto fail;
 
@@ -3665,7 +3634,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
         u64 objectid;
         u64 index = 0;
 
-        err = btrfs_check_free_space(root, 1, 0);
+        err = btrfs_check_metadata_free_space(root);
         if (err)
                 goto fail;
         trans = btrfs_start_transaction(root, 1);
@@ -3733,7 +3702,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
                 return -ENOENT;
 
         btrfs_inc_nlink(inode);
-        err = btrfs_check_free_space(root, 1, 0);
+        err = btrfs_check_metadata_free_space(root);
         if (err)
                 goto fail;
         err = btrfs_set_inode_index(dir, &index);
@@ -3779,7 +3748,7 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
         u64 index = 0;
         unsigned long nr = 1;
 
-        err = btrfs_check_free_space(root, 1, 0);
+        err = btrfs_check_metadata_free_space(root);
         if (err)
                 goto out_unlock;
 
@@ -4336,7 +4305,7 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
         u64 page_start;
         u64 page_end;
 
-        ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
+        ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE);
         if (ret)
                 goto out;
 
@@ -4349,6 +4318,7 @@ again:
 
         if ((page->mapping != inode->i_mapping) ||
             (page_start >= size)) {
+                btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
                 /* page got truncated out from underneath us */
                 goto out_unlock;
         }
@@ -4631,7 +4601,7 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
         if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
                 return -EXDEV;
 
-        ret = btrfs_check_free_space(root, 1, 0);
+        ret = btrfs_check_metadata_free_space(root);
         if (ret)
                 goto out_unlock;
 
@@ -4749,7 +4719,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
         if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
                 return -ENAMETOOLONG;
 
-        err = btrfs_check_free_space(root, 1, 0);
+        err = btrfs_check_metadata_free_space(root);
         if (err)
                 goto out_fail;
 
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 988fdc8b49eb..bca729fc80c8 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -70,7 +70,7 @@ static noinline int create_subvol(struct btrfs_root *root,
         u64 index = 0;
         unsigned long nr = 1;
 
-        ret = btrfs_check_free_space(root, 1, 0);
+        ret = btrfs_check_metadata_free_space(root);
         if (ret)
                 goto fail_commit;
 
@@ -203,7 +203,7 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
         if (!root->ref_cows)
                 return -EINVAL;
 
-        ret = btrfs_check_free_space(root, 1, 0);
+        ret = btrfs_check_metadata_free_space(root);
         if (ret)
                 goto fail_unlock;
 
@@ -374,7 +374,7 @@ static int btrfs_defrag_file(struct file *file)
         unsigned long i;
         int ret;
 
-        ret = btrfs_check_free_space(root, inode->i_size, 0);
+        ret = btrfs_check_data_free_space(root, inode, inode->i_size);
         if (ret)
                 return -ENOSPC;
 
diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index 85506c4a3af7..47b0a88c12a2 100644
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -220,8 +220,8 @@ int btrfs_tree_unlock(struct extent_buffer *eb)
         return 0;
 }
 
-int btrfs_tree_locked(struct extent_buffer *eb)
+void btrfs_assert_tree_locked(struct extent_buffer *eb)
 {
-        return test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags) ||
-                        spin_is_locked(&eb->lock);
+        if (!test_bit(EXTENT_BUFFER_BLOCKING, &eb->bflags))
+                assert_spin_locked(&eb->lock);
 }
diff --git a/fs/btrfs/locking.h b/fs/btrfs/locking.h
index 6bb0afbff928..6c4ce457168c 100644
--- a/fs/btrfs/locking.h
+++ b/fs/btrfs/locking.h
@@ -21,11 +21,11 @@
 
 int btrfs_tree_lock(struct extent_buffer *eb);
 int btrfs_tree_unlock(struct extent_buffer *eb);
-int btrfs_tree_locked(struct extent_buffer *eb);
 
 int btrfs_try_tree_lock(struct extent_buffer *eb);
 int btrfs_try_spin_lock(struct extent_buffer *eb);
 
 void btrfs_set_lock_blocking(struct extent_buffer *eb);
 void btrfs_clear_lock_blocking(struct extent_buffer *eb);
+void btrfs_assert_tree_locked(struct extent_buffer *eb);
 #endif
diff --git a/fs/buffer.c b/fs/buffer.c
index 665d446b25bc..9f697419ed8e 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -777,6 +777,7 @@ static int __set_page_dirty(struct page *page,
                         __inc_zone_page_state(page, NR_FILE_DIRTY);
                         __inc_bdi_stat(mapping->backing_dev_info,
                                         BDI_RECLAIMABLE);
+                        task_dirty_inc(current);
                         task_io_account_write(PAGE_CACHE_SIZE);
                 }
                 radix_tree_tag_set(&mapping->page_tree,
@@ -3108,7 +3109,7 @@ int sync_dirty_buffer(struct buffer_head *bh)
         if (test_clear_buffer_dirty(bh)) {
                 get_bh(bh);
                 bh->b_end_io = end_buffer_write_sync;
-                ret = submit_bh(WRITE_SYNC, bh);
+                ret = submit_bh(WRITE, bh);
                 wait_on_buffer(bh);
                 if (buffer_eopnotsupp(bh)) {
                         clear_buffer_eopnotsupp(bh);
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index 73ac7ebd1dfc..851388fafc73 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -1,3 +1,13 @@
+Version 1.57
+------------
+Improve support for multiple security contexts to the same server. We
+used to use the same "vcnumber" for all connections which could cause
+the server to treat subsequent connections, especially those that
+are authenticated as guest, as reconnections, invalidating the earlier
+user's smb session.  This fix allows cifs to mount multiple times to the
+same server with different userids without risking invalidating earlier
+established security contexts.
+
 Version 1.56
 ------------
 Add "forcemandatorylock" mount option to allow user to use mandatory
@@ -7,7 +17,10 @@ specified and user does not have access to query information about the
 top of the share.  Fix problem in 2.6.28 resolving DFS paths to
 Samba servers (worked to Windows).  Fix rmdir so that pending search
 (readdir) requests do not get invalid results which include the now
-removed directory.
+removed directory.  Fix oops in cifs_dfs_ref.c when prefixpath is not reachable
+when using DFS.  Add better file create support to servers which support
+the CIFS POSIX protocol extensions (this adds support for new flags
+on create, and improves semantics for write of locked ranges).
 
 Version 1.55
 ------------
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 7ac481841f87..2b1d28a9ee28 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -100,5 +100,5 @@ extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
 extern const struct export_operations cifs_export_ops;
 #endif /* EXPERIMENTAL */
 
-#define CIFS_VERSION   "1.56"
+#define CIFS_VERSION   "1.57"
 #endif                          /* _CIFSFS_H */
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 94c1ca0ec953..e004f6db5fc8 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -164,9 +164,12 @@ struct TCP_Server_Info {
         /* multiplexed reads or writes */
         unsigned int maxBuf;    /* maxBuf specifies the maximum */
         /* message size the server can send or receive for non-raw SMBs */
-        unsigned int maxRw;     /* maxRw specifies the maximum */
+        unsigned int max_rw;    /* maxRw specifies the maximum */
         /* message size the server can send or receive for */
         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
+        unsigned int max_vcs;   /* maximum number of smb sessions, at least
+                                   those that can be specified uniquely with
+                                   vcnumbers */
         char sessid[4];         /* unique token id for this session */
         /* (returned on Negotiate */
         int capabilities; /* allow selective disabling of caps by smb sess */
@@ -210,6 +213,7 @@ struct cifsSesInfo {
         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
         __u16 ipc_tid;          /* special tid for connection to IPC share */
         __u16 flags;
+        __u16 vcnum;
         char *serverOS;         /* name of operating system underlying server */
         char *serverNOS;        /* name of network operating system of server */
         char *serverDomain;     /* security realm of server */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 382ba6298809..083dfc57c7a3 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -42,6 +42,7 @@ extern void _FreeXid(unsigned int);
 #define GetXid() (int)_GetXid(); cFYI(1,("CIFS VFS: in %s as Xid: %d with uid: %d",__func__, xid,current_fsuid()));
 #define FreeXid(curr_xid) {_FreeXid(curr_xid); cFYI(1,("CIFS VFS: leaving %s (xid = %d) rc = %d",__func__,curr_xid,(int)rc));}
 extern char *build_path_from_dentry(struct dentry *);
+extern char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb);
 extern char *build_wildcard_path_from_dentry(struct dentry *direntry);
 /* extern void renew_parental_timestamps(struct dentry *direntry);*/
 extern int SendReceive(const unsigned int /* xid */ , struct cifsSesInfo *,
@@ -91,6 +92,9 @@ extern u64 cifs_UnixTimeToNT(struct timespec);
 extern __le64 cnvrtDosCifsTm(__u16 date, __u16 time);
 extern struct timespec cnvrtDosUnixTm(__u16 date, __u16 time);
 
+extern void posix_fill_in_inode(struct inode *tmp_inode,
+                                FILE_UNIX_BASIC_INFO *pData, int isNewInode);
+extern struct inode *cifs_new_inode(struct super_block *sb, __u64 *inum);
 extern int cifs_get_inode_info(struct inode **pinode,
                         const unsigned char *search_path,
                         FILE_ALL_INFO *pfile_info,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 552642a507c4..939e2f76b959 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -528,14 +528,15 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
                 server->maxReq = le16_to_cpu(rsp->MaxMpxCount);
                 server->maxBuf = min((__u32)le16_to_cpu(rsp->MaxBufSize),
                                 (__u32)CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);
+                server->max_vcs = le16_to_cpu(rsp->MaxNumberVcs);
                 GETU32(server->sessid) = le32_to_cpu(rsp->SessionKey);
                 /* even though we do not use raw we might as well set this
                 accurately, in case we ever find a need for it */
                 if ((le16_to_cpu(rsp->RawMode) & RAW_ENABLE) == RAW_ENABLE) {
-                        server->maxRw = 0xFF00;
+                        server->max_rw = 0xFF00;
                         server->capabilities = CAP_MPX_MODE | CAP_RAW_MODE;
                 } else {
-                        server->maxRw = 0;/* we do not need to use raw anyway */
+                        server->max_rw = 0;/* do not need to use raw anyway */
                         server->capabilities = CAP_MPX_MODE;
                 }
                 tmp = (__s16)le16_to_cpu(rsp->ServerTimeZone);
@@ -638,7 +639,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
         /* probably no need to store and check maxvcs */
         server->maxBuf = min(le32_to_cpu(pSMBr->MaxBufferSize),
                         (__u32) CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);
-        server->maxRw = le32_to_cpu(pSMBr->MaxRawSize);
+        server->max_rw = le32_to_cpu(pSMBr->MaxRawSize);
         cFYI(DBG2, ("Max buf = %d", ses->server->maxBuf));
         GETU32(ses->server->sessid) = le32_to_cpu(pSMBr->SessionKey);
         server->capabilities = le32_to_cpu(pSMBr->Capabilities);
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 2209be943051..da0f4ffa0613 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -23,7 +23,6 @@
 #include <linux/string.h>
 #include <linux/list.h>
 #include <linux/wait.h>
-#include <linux/ipv6.h>
 #include <linux/pagemap.h>
 #include <linux/ctype.h>
 #include <linux/utsname.h>
@@ -35,6 +34,7 @@
 #include <linux/freezer.h>
 #include <asm/uaccess.h>
 #include <asm/processor.h>
+#include <net/ipv6.h>
 #include "cifspdu.h"
 #include "cifsglob.h"
 #include "cifsproto.h"
@@ -1379,8 +1379,8 @@ cifs_find_tcp_session(struct sockaddr_storage *addr)
                      server->addr.sockAddr.sin_addr.s_addr))
                         continue;
                 else if (addr->ss_family == AF_INET6 &&
-                         memcmp(&server->addr.sockAddr6.sin6_addr,
-                                &addr6->sin6_addr, sizeof(addr6->sin6_addr)))
+                         !ipv6_addr_equal(&server->addr.sockAddr6.sin6_addr,
+                                          &addr6->sin6_addr))
                         continue;
 
                 ++server->srv_count;
@@ -2180,6 +2180,33 @@ static void setup_cifs_sb(struct smb_vol *pvolume_info,
                            "mount option supported"));
 }
 
+static int
+is_path_accessible(int xid, struct cifsTconInfo *tcon,
+                   struct cifs_sb_info *cifs_sb, const char *full_path)
+{
+        int rc;
+        __u64 inode_num;
+        FILE_ALL_INFO *pfile_info;
+
+        rc = CIFSGetSrvInodeNumber(xid, tcon, full_path, &inode_num,
+                                   cifs_sb->local_nls,
+                                   cifs_sb->mnt_cifs_flags &
+                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
+        if (rc != -EOPNOTSUPP)
+                return rc;
+
+        pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
+        if (pfile_info == NULL)
+                return -ENOMEM;
+
+        rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
+                              0 /* not legacy */, cifs_sb->local_nls,
+                              cifs_sb->mnt_cifs_flags &
+                                CIFS_MOUNT_MAP_SPECIAL_CHR);
+        kfree(pfile_info);
+        return rc;
+}
+
 int
 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
            char *mount_data, const char *devname)
@@ -2190,6 +2217,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
         struct cifsSesInfo *pSesInfo = NULL;
         struct cifsTconInfo *tcon = NULL;
         struct TCP_Server_Info *srvTcp = NULL;
+        char   *full_path;
 
         xid = GetXid();
 
@@ -2426,6 +2454,23 @@ mount_fail_check:
                 cifs_sb->rsize = min(cifs_sb->rsize,
                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
 
+        if (!rc && cifs_sb->prepathlen) {
+                /* build_path_to_root works only when we have a valid tcon */
+                full_path = cifs_build_path_to_root(cifs_sb);
+                if (full_path == NULL) {
+                        rc = -ENOMEM;
+                        goto mount_fail_check;
+                }
+                rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
+                if (rc) {
+                        cERROR(1, ("Path %s in not accessible: %d",
+                                                full_path, rc));
+                        kfree(full_path);
+                        goto mount_fail_check;
+                }
+                kfree(full_path);
+        }
+
         /* volume_info->password is freed above when existing session found
         (in which case it is not needed anymore) but when new sesion is created
         the password ptr is put in the new session structure (in which case the
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 964aad03c5ad..89fb72832652 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -3,7 +3,7 @@
  *
  *   vfs operations that deal with dentries
  *
- *   Copyright (C) International Business Machines  Corp., 2002,2008
+ *   Copyright (C) International Business Machines  Corp., 2002,2009
  *   Author(s): Steve French (sfrench@us.ibm.com)
  *
  *   This library is free software; you can redistribute it and/or modify
@@ -129,6 +129,78 @@ cifs_bp_rename_retry:
         return full_path;
 }
 
+static int cifs_posix_open(char *full_path, struct inode **pinode,
+                    struct super_block *sb, int mode, int oflags,
+                    int *poplock, __u16 *pnetfid, int xid)
+{
+        int rc;
+        __u32 oplock;
+        FILE_UNIX_BASIC_INFO *presp_data;
+        __u32 posix_flags = 0;
+        struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+
+        cFYI(1, ("posix open %s", full_path));
+
+        presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
+        if (presp_data == NULL)
+                return -ENOMEM;
+
+/* So far cifs posix extensions can only map the following flags.
+   There are other valid fmode oflags such as FMODE_LSEEK, FMODE_PREAD, but
+   so far we do not seem to need them, and we can treat them as local only */
+        if ((oflags & (FMODE_READ | FMODE_WRITE)) ==
+                (FMODE_READ | FMODE_WRITE))
+                posix_flags = SMB_O_RDWR;
+        else if (oflags & FMODE_READ)
+                posix_flags = SMB_O_RDONLY;
+        else if (oflags & FMODE_WRITE)
+                posix_flags = SMB_O_WRONLY;
+        if (oflags & O_CREAT)
+                posix_flags |= SMB_O_CREAT;
+        if (oflags & O_EXCL)
+                posix_flags |= SMB_O_EXCL;
+        if (oflags & O_TRUNC)
+                posix_flags |= SMB_O_TRUNC;
+        if (oflags & O_APPEND)
+                posix_flags |= SMB_O_APPEND;
+        if (oflags & O_SYNC)
+                posix_flags |= SMB_O_SYNC;
+        if (oflags & O_DIRECTORY)
+                posix_flags |= SMB_O_DIRECTORY;
+        if (oflags & O_NOFOLLOW)
+                posix_flags |= SMB_O_NOFOLLOW;
+        if (oflags & O_DIRECT)
+                posix_flags |= SMB_O_DIRECT;
+
+
+        rc = CIFSPOSIXCreate(xid, cifs_sb->tcon, posix_flags, mode,
+                        pnetfid, presp_data, &oplock, full_path,
+                        cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
+                                        CIFS_MOUNT_MAP_SPECIAL_CHR);
+        if (rc)
+                goto posix_open_ret;
+
+        if (presp_data->Type == cpu_to_le32(-1))
+                goto posix_open_ret; /* open ok, caller does qpathinfo */
+
+        /* get new inode and set it up */
+        if (!pinode)
+                goto posix_open_ret; /* caller does not need info */
+
+        *pinode = cifs_new_inode(sb, &presp_data->UniqueId);
+
+        /* We do not need to close the file if new_inode fails since
+           the caller will retry qpathinfo as long as inode is null */
+        if (*pinode == NULL)
+                goto posix_open_ret;
+
+        posix_fill_in_inode(*pinode, presp_data, 1);
+
+posix_open_ret:
+        kfree(presp_data);
+        return rc;
+}
+
 static void setup_cifs_dentry(struct cifsTconInfo *tcon,
                               struct dentry *direntry,
                               struct inode *newinode)
@@ -150,7 +222,14 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
         int xid;
         int create_options = CREATE_NOT_DIR;
         int oplock = 0;
-        /* BB below access is too much for the mknod to request */
+        int oflags;
+        /*
+         * BB below access is probably too much for mknod to request
+         *    but we have to do query and setpathinfo so requesting
+         *    less could fail (unless we want to request getatr and setatr
+         *    permissions (only).  At least for POSIX we do not have to
+         *    request so much.
+         */
         int desiredAccess = GENERIC_READ | GENERIC_WRITE;
         __u16 fileHandle;
         struct cifs_sb_info *cifs_sb;
@@ -174,13 +253,43 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
         }
 
         mode &= ~current->fs->umask;
+        if (oplockEnabled)
+                oplock = REQ_OPLOCK;
 
-        if (nd && (nd->flags & LOOKUP_OPEN)) {
-                int oflags = nd->intent.open.flags;
+        if (nd && (nd->flags & LOOKUP_OPEN))
+                oflags = nd->intent.open.flags;
+        else
+                oflags = FMODE_READ;
+
+        if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
+            (CIFS_UNIX_POSIX_PATH_OPS_CAP &
+                        le64_to_cpu(tcon->fsUnixInfo.Capability))) {
+                rc = cifs_posix_open(full_path, &newinode, inode->i_sb,
+                                     mode, oflags, &oplock, &fileHandle, xid);
+                /* EIO could indicate that (posix open) operation is not
+                   supported, despite what server claimed in capability
+                   negotation.  EREMOTE indicates DFS junction, which is not
+                   handled in posix open */
+
+                if ((rc == 0) && (newinode == NULL))
+                        goto cifs_create_get_file_info; /* query inode info */
+                else if (rc == 0) /* success, no need to query */
+                        goto cifs_create_set_dentry;
+                else if ((rc != -EIO) && (rc != -EREMOTE) &&
+                         (rc != -EOPNOTSUPP)) /* path not found or net err */
+                        goto cifs_create_out;
+                /* else fallthrough to retry, using older open call, this is
+                   case where server does not support this SMB level, and
+                   falsely claims capability (also get here for DFS case
+                   which should be rare for path not covered on files) */
+        }
 
+        if (nd && (nd->flags & LOOKUP_OPEN)) {
+                /* if the file is going to stay open, then we
+                   need to set the desired access properly */
                 desiredAccess = 0;
                 if (oflags & FMODE_READ)
-                        desiredAccess |= GENERIC_READ;
+                        desiredAccess |= GENERIC_READ; /* is this too little? */
                 if (oflags & FMODE_WRITE) {
                         desiredAccess |= GENERIC_WRITE;
                         if (!(oflags & FMODE_READ))
@@ -199,8 +308,6 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 
         /* BB add processing to set equivalent of mode - e.g. via CreateX with
            ACLs */
-        if (oplockEnabled)
-                oplock = REQ_OPLOCK;
 
         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
         if (buf == NULL) {
@@ -233,116 +340,112 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
         }
         if (rc) {
                 cFYI(1, ("cifs_create returned 0x%x", rc));
-        } else {
-                /* If Open reported that we actually created a file
-                then we now have to set the mode if possible */
-                if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
-                        struct cifs_unix_set_info_args args = {
+                goto cifs_create_out;
+        }
+
+        /* If Open reported that we actually created a file
+           then we now have to set the mode if possible */
+        if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
+                struct cifs_unix_set_info_args args = {
                                 .mode   = mode,
                                 .ctime  = NO_CHANGE_64,
                                 .atime  = NO_CHANGE_64,
                                 .mtime  = NO_CHANGE_64,
                                 .device = 0,
-                        };
+                };
 
-                        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
-                                args.uid = (__u64) current_fsuid();
-                                if (inode->i_mode & S_ISGID)
-                                        args.gid = (__u64) inode->i_gid;
-                                else
-                                        args.gid = (__u64) current_fsgid();
-                        } else {
-                                args.uid = NO_CHANGE_64;
-                                args.gid = NO_CHANGE_64;
-                        }
-                        CIFSSMBUnixSetInfo(xid, tcon, full_path, &args,
-                                cifs_sb->local_nls,
-                                cifs_sb->mnt_cifs_flags &
-                                        CIFS_MOUNT_MAP_SPECIAL_CHR);
+                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+                        args.uid = (__u64) current_fsuid();
+                        if (inode->i_mode & S_ISGID)
+                                args.gid = (__u64) inode->i_gid;
+                        else
+                                args.gid = (__u64) current_fsgid();
                 } else {
-                        /* BB implement mode setting via Windows security
-                           descriptors e.g. */
-                        /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
-
-                        /* Could set r/o dos attribute if mode & 0222 == 0 */
+                        args.uid = NO_CHANGE_64;
+                        args.gid = NO_CHANGE_64;
                 }
+                CIFSSMBUnixSetInfo(xid, tcon, full_path, &args,
+                        cifs_sb->local_nls,
+                        cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+        } else {
+                /* BB implement mode setting via Windows security
+                   descriptors e.g. */
+                /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
 
-                /* server might mask mode so we have to query for it */
-                if (tcon->unix_ext)
-                        rc = cifs_get_inode_info_unix(&newinode, full_path,
-                                                 inode->i_sb, xid);
-                else {
-                        rc = cifs_get_inode_info(&newinode, full_path,
-                                                 buf, inode->i_sb, xid,
-                                                 &fileHandle);
-                        if (newinode) {
-                                if (cifs_sb->mnt_cifs_flags &
-                                    CIFS_MOUNT_DYNPERM)
-                                        newinode->i_mode = mode;
-                                if ((oplock & CIFS_CREATE_ACTION) &&
-                                    (cifs_sb->mnt_cifs_flags &
-                                     CIFS_MOUNT_SET_UID)) {
-                                        newinode->i_uid = current_fsuid();
-                                        if (inode->i_mode & S_ISGID)
-                                                newinode->i_gid =
-                                                        inode->i_gid;
-                                        else
-                                                newinode->i_gid =
-                                                        current_fsgid();
-                                }
+                /* Could set r/o dos attribute if mode & 0222 == 0 */
+        }
+
+cifs_create_get_file_info:
+        /* server might mask mode so we have to query for it */
+        if (tcon->unix_ext)
+                rc = cifs_get_inode_info_unix(&newinode, full_path,
+                                              inode->i_sb, xid);
+        else {
+                rc = cifs_get_inode_info(&newinode, full_path, buf,
+                                         inode->i_sb, xid, &fileHandle);
+                if (newinode) {
+                        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
+                                newinode->i_mode = mode;
+                        if ((oplock & CIFS_CREATE_ACTION) &&
+                            (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
+                                newinode->i_uid = current_fsuid();
+                                if (inode->i_mode & S_ISGID)
+                                        newinode->i_gid = inode->i_gid;
+                                else
+                                        newinode->i_gid = current_fsgid();
                         }
                 }
+        }
 
-                if (rc != 0) {
-                        cFYI(1, ("Create worked, get_inode_info failed rc = %d",
-                                 rc));
-                } else
-                        setup_cifs_dentry(tcon, direntry, newinode);
-
-                if ((nd == NULL /* nfsd case - nfs srv does not set nd */) ||
-                        (!(nd->flags & LOOKUP_OPEN))) {
-                        /* mknod case - do not leave file open */
-                        CIFSSMBClose(xid, tcon, fileHandle);
-                } else if (newinode) {
-                        struct cifsFileInfo *pCifsFile =
-                           kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
-
-                        if (pCifsFile == NULL)
-                                goto cifs_create_out;
-                        pCifsFile->netfid = fileHandle;
-                        pCifsFile->pid = current->tgid;
-                        pCifsFile->pInode = newinode;
-                        pCifsFile->invalidHandle = false;
-                        pCifsFile->closePend     = false;
-                        init_MUTEX(&pCifsFile->fh_sem);
-                        mutex_init(&pCifsFile->lock_mutex);
-                        INIT_LIST_HEAD(&pCifsFile->llist);
-                        atomic_set(&pCifsFile->wrtPending, 0);
-
-                        /* set the following in open now
+cifs_create_set_dentry:
+        if (rc == 0)
+                setup_cifs_dentry(tcon, direntry, newinode);
+        else
+                cFYI(1, ("Create worked, get_inode_info failed rc = %d", rc));
+
+        /* nfsd case - nfs srv does not set nd */
+        if ((nd == NULL) || (!(nd->flags & LOOKUP_OPEN))) {
+                /* mknod case - do not leave file open */
+                CIFSSMBClose(xid, tcon, fileHandle);
+        } else if (newinode) {
+                struct cifsFileInfo *pCifsFile =
+                        kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
+
+                if (pCifsFile == NULL)
+                        goto cifs_create_out;
+                pCifsFile->netfid = fileHandle;
+                pCifsFile->pid = current->tgid;
+                pCifsFile->pInode = newinode;
+                pCifsFile->invalidHandle = false;
+                pCifsFile->closePend     = false;
+                init_MUTEX(&pCifsFile->fh_sem);
+                mutex_init(&pCifsFile->lock_mutex);
+                INIT_LIST_HEAD(&pCifsFile->llist);
+                atomic_set(&pCifsFile->wrtPending, 0);
+
+                /* set the following in open now
                                 pCifsFile->pfile = file; */
-                        write_lock(&GlobalSMBSeslock);
-                        list_add(&pCifsFile->tlist, &tcon->openFileList);
-                        pCifsInode = CIFS_I(newinode);
-                        if (pCifsInode) {
-                                /* if readable file instance put first in list*/
-                                if (write_only) {
-                                        list_add_tail(&pCifsFile->flist,
-                                                &pCifsInode->openFileList);
-                                } else {
-                                        list_add(&pCifsFile->flist,
-                                                &pCifsInode->openFileList);
-                                }
-                                if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
-                                        pCifsInode->clientCanCacheAll = true;
-                                        pCifsInode->clientCanCacheRead = true;
-                                        cFYI(1, ("Exclusive Oplock inode %p",
-                                                newinode));
-                                } else if ((oplock & 0xF) == OPLOCK_READ)
-                                        pCifsInode->clientCanCacheRead = true;
+                write_lock(&GlobalSMBSeslock);
+                list_add(&pCifsFile->tlist, &tcon->openFileList);
+                pCifsInode = CIFS_I(newinode);
+                if (pCifsInode) {
+                        /* if readable file instance put first in list*/
+                        if (write_only) {
+                                list_add_tail(&pCifsFile->flist,
+                                              &pCifsInode->openFileList);
+                        } else {
+                                list_add(&pCifsFile->flist,
+                                         &pCifsInode->openFileList);
                         }
-                        write_unlock(&GlobalSMBSeslock);
+                        if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
+                                pCifsInode->clientCanCacheAll = true;
+                                pCifsInode->clientCanCacheRead = true;
+                                cFYI(1, ("Exclusive Oplock inode %p",
+                                        newinode));
+                        } else if ((oplock & 0xF) == OPLOCK_READ)
+                                pCifsInode->clientCanCacheRead = true;
                 }
+                write_unlock(&GlobalSMBSeslock);
         }
 cifs_create_out:
         kfree(buf);
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index bcf7b5184664..4690a360c855 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -199,6 +199,49 @@ static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
         pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
 }
 
+/**
+ * cifs_new inode - create new inode, initialize, and hash it
+ * @sb - pointer to superblock
+ * @inum - if valid pointer and serverino is enabled, replace i_ino with val
+ *
+ * Create a new inode, initialize it for CIFS and hash it. Returns the new
+ * inode or NULL if one couldn't be allocated.
+ *
+ * If the share isn't mounted with "serverino" or inum is a NULL pointer then
+ * we'll just use the inode number assigned by new_inode(). Note that this can
+ * mean i_ino collisions since the i_ino assigned by new_inode is not
+ * guaranteed to be unique.
+ */
+struct inode *
+cifs_new_inode(struct super_block *sb, __u64 *inum)
+{
+        struct inode *inode;
+
+        inode = new_inode(sb);
+        if (inode == NULL)
+                return NULL;
+
+        /*
+         * BB: Is i_ino == 0 legal? Here, we assume that it is. If it isn't we
+         *     stop passing inum as ptr. Are there sanity checks we can use to
+         *     ensure that the server is really filling in that field? Also,
+         *     if serverino is disabled, perhaps we should be using iunique()?
+         */
+        if (inum && (CIFS_SB(sb)->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
+                inode->i_ino = (unsigned long) *inum;
+
+        /*
+         * must set this here instead of cifs_alloc_inode since VFS will
+         * clobber i_flags
+         */
+        if (sb->s_flags & MS_NOATIME)
+                inode->i_flags |= S_NOATIME | S_NOCMTIME;
+
+        insert_inode_hash(inode);
+
+        return inode;
+}
+
 int cifs_get_inode_info_unix(struct inode **pinode,
         const unsigned char *full_path, struct super_block *sb, int xid)
 {
@@ -233,22 +276,11 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 
         /* get new inode */
         if (*pinode == NULL) {
-                *pinode = new_inode(sb);
+                *pinode = cifs_new_inode(sb, &find_data.UniqueId);
                 if (*pinode == NULL) {
                         rc = -ENOMEM;
                         goto cgiiu_exit;
                 }
-                /* Is an i_ino of zero legal? */
-                /* note ino incremented to unique num in new_inode */
-                /* Are there sanity checks we can use to ensure that
-                   the server is really filling in that field? */
-                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
-                        (*pinode)->i_ino = (unsigned long)find_data.UniqueId;
-
-                if (sb->s_flags & MS_NOATIME)
-                        (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
-
-                insert_inode_hash(*pinode);
         }
 
         inode = *pinode;
@@ -465,11 +497,9 @@ int cifs_get_inode_info(struct inode **pinode,
 
         /* get new inode */
         if (*pinode == NULL) {
-                *pinode = new_inode(sb);
-                if (*pinode == NULL) {
-                        rc = -ENOMEM;
-                        goto cgii_exit;
-                }
+                __u64 inode_num;
+                __u64 *pinum = &inode_num;
+
                 /* Is an i_ino of zero legal? Can we use that to check
                    if the server supports returning inode numbers?  Are
                    there other sanity checks we can use to ensure that
@@ -486,22 +516,26 @@ int cifs_get_inode_info(struct inode **pinode,
 
                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
                         int rc1 = 0;
-                        __u64 inode_num;
 
                         rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
-                                        full_path, &inode_num,
+                                        full_path, pinum,
                                         cifs_sb->local_nls,
                                         cifs_sb->mnt_cifs_flags &
                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
                         if (rc1) {
                                 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
+                                pinum = NULL;
                                 /* BB EOPNOSUPP disable SERVER_INUM? */
-                        } else /* do we need cast or hash to ino? */
-                                (*pinode)->i_ino = inode_num;
-                } /* else ino incremented to unique num in new_inode*/
-                if (sb->s_flags & MS_NOATIME)
-                        (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
-                insert_inode_hash(*pinode);
+                        }
+                } else {
+                        pinum = NULL;
+                }
+
+                *pinode = cifs_new_inode(sb, pinum);
+                if (*pinode == NULL) {
+                        rc = -ENOMEM;
+                        goto cgii_exit;
+                }
         }
         inode = *pinode;
         cifsInfo = CIFS_I(inode);
@@ -621,7 +655,7 @@ static const struct inode_operations cifs_ipc_inode_ops = {
         .lookup = cifs_lookup,
 };
 
-static char *build_path_to_root(struct cifs_sb_info *cifs_sb)
+char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb)
 {
         int pplen = cifs_sb->prepathlen;
         int dfsplen;
@@ -678,7 +712,7 @@ struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
                 return inode;
 
         cifs_sb = CIFS_SB(inode->i_sb);
-        full_path = build_path_to_root(cifs_sb);
+        full_path = cifs_build_path_to_root(cifs_sb);
         if (full_path == NULL)
                 return ERR_PTR(-ENOMEM);
 
@@ -1017,7 +1051,7 @@ out_reval:
         return rc;
 }
 
-static void posix_fill_in_inode(struct inode *tmp_inode,
+void posix_fill_in_inode(struct inode *tmp_inode,
         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
 {
         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
@@ -1114,24 +1148,14 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
                         else
                                 direntry->d_op = &cifs_dentry_ops;
 
-                        newinode = new_inode(inode->i_sb);
+                        newinode = cifs_new_inode(inode->i_sb,
+                                                  &pInfo->UniqueId);
                         if (newinode == NULL) {
                                 kfree(pInfo);
                                 goto mkdir_get_info;
                         }
 
-                        /* Is an i_ino of zero legal? */
-                        /* Are there sanity checks we can use to ensure that
-                           the server is really filling in that field? */
-                        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
-                                newinode->i_ino =
-                                        (unsigned long)pInfo->UniqueId;
-                        } /* note ino incremented to unique num in new_inode */
-                        if (inode->i_sb->s_flags & MS_NOATIME)
-                                newinode->i_flags |= S_NOATIME | S_NOCMTIME;
                         newinode->i_nlink = 2;
-
-                        insert_inode_hash(newinode);
                         d_instantiate(direntry, newinode);
 
                         /* we already checked in POSIXCreate whether
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 9f51f9bf0292..c2c01ff4c32c 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -56,35 +56,34 @@ static inline void dump_cifs_file_struct(struct file *file, char *label)
 }
 #endif /* DEBUG2 */
 
-/* Returns one if new inode created (which therefore needs to be hashed) */
+/* Returns 1 if new inode created, 2 if both dentry and inode were */
 /* Might check in the future if inode number changed so we can rehash inode */
-static int construct_dentry(struct qstr *qstring, struct file *file,
-        struct inode **ptmp_inode, struct dentry **pnew_dentry)
+static int
+construct_dentry(struct qstr *qstring, struct file *file,
+                 struct inode **ptmp_inode, struct dentry **pnew_dentry,
+                 __u64 *inum)
 {
-        struct dentry *tmp_dentry;
-        struct cifs_sb_info *cifs_sb;
-        struct cifsTconInfo *pTcon;
+        struct dentry *tmp_dentry = NULL;
+        struct super_block *sb = file->f_path.dentry->d_sb;
         int rc = 0;
 
         cFYI(1, ("For %s", qstring->name));
-        cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-        pTcon = cifs_sb->tcon;
 
         qstring->hash = full_name_hash(qstring->name, qstring->len);
         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
         if (tmp_dentry) {
+                /* BB: overwrite old name? i.e. tmp_dentry->d_name and
+                 * tmp_dentry->d_name.len??
+                 */
                 cFYI(0, ("existing dentry with inode 0x%p",
                          tmp_dentry->d_inode));
                 *ptmp_inode = tmp_dentry->d_inode;
-/* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
                 if (*ptmp_inode == NULL) {
-                        *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
+                        *ptmp_inode = cifs_new_inode(sb, inum);
                         if (*ptmp_inode == NULL)
                                 return rc;
                         rc = 1;
                 }
-                if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
-                        (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
         } else {
                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
                 if (tmp_dentry == NULL) {
@@ -93,15 +92,14 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
                         return rc;
                 }
 
-                *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
-                if (pTcon->nocase)
+                if (CIFS_SB(sb)->tcon->nocase)
                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
                 else
                         tmp_dentry->d_op = &cifs_dentry_ops;
+
+                *ptmp_inode = cifs_new_inode(sb, inum);
                 if (*ptmp_inode == NULL)
                         return rc;
-                if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
-                        (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
                 rc = 2;
         }
 
@@ -822,7 +820,7 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 /* inode num, inode type and filename returned */
 static int cifs_get_name_from_search_buf(struct qstr *pqst,
         char *current_entry, __u16 level, unsigned int unicode,
-        struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
+        struct cifs_sb_info *cifs_sb, int max_len, __u64 *pinum)
 {
         int rc = 0;
         unsigned int len = 0;
@@ -842,9 +840,7 @@ static int cifs_get_name_from_search_buf(struct qstr *pqst,
                         len = strnlen(filename, PATH_MAX);
                 }
 
-                /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
-                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
-                        *pinum = pFindData->UniqueId;
+                *pinum = pFindData->UniqueId;
         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
                 FILE_DIRECTORY_INFO *pFindData =
                         (FILE_DIRECTORY_INFO *)current_entry;
@@ -907,7 +903,7 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
         struct qstr qstring;
         struct cifsFileInfo *pCifsF;
         unsigned int obj_type;
-        ino_t  inum;
+        __u64  inum;
         struct cifs_sb_info *cifs_sb;
         struct inode *tmp_inode;
         struct dentry *tmp_dentry;
@@ -940,20 +936,18 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
         if (rc)
                 return rc;
 
-        rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
+        /* only these two infolevels return valid inode numbers */
+        if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
+            pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
+                rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
+                                        &inum);
+        else
+                rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
+                                        NULL);
+
         if ((tmp_inode == NULL) || (tmp_dentry == NULL))
                 return -ENOMEM;
 
-        if (rc) {
-                /* inode created, we need to hash it with right inode number */
-                if (inum != 0) {
-                        /* BB fixme - hash the 2 32 quantities bits together if
-                         *  necessary BB */
-                        tmp_inode->i_ino = inum;
-                }
-                insert_inode_hash(tmp_inode);
-        }
-
         /* we pass in rc below, indicating whether it is a new inode,
            so we can figure out whether to invalidate the inode cached
            data if the file has changed */
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 5f22de7b79a9..5c68b4282be9 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -34,15 +34,99 @@
 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
                          unsigned char *p24);
 
+/* Checks if this is the first smb session to be reconnected after
+   the socket has been reestablished (so we know whether to use vc 0).
+   Called while holding the cifs_tcp_ses_lock, so do not block */
+static bool is_first_ses_reconnect(struct cifsSesInfo *ses)
+{
+        struct list_head *tmp;
+        struct cifsSesInfo *tmp_ses;
+
+        list_for_each(tmp, &ses->server->smb_ses_list) {
+                tmp_ses = list_entry(tmp, struct cifsSesInfo,
+                                     smb_ses_list);
+                if (tmp_ses->need_reconnect == false)
+                        return false;
+        }
+        /* could not find a session that was already connected,
+           this must be the first one we are reconnecting */
+        return true;
+}
+
+/*
+ *      vc number 0 is treated specially by some servers, and should be the
+ *      first one we request.  After that we can use vcnumbers up to maxvcs,
+ *      one for each smb session (some Windows versions set maxvcs incorrectly
+ *      so maxvc=1 can be ignored).  If we have too many vcs, we can reuse
+ *      any vc but zero (some servers reset the connection on vcnum zero)
+ *
+ */
+static __le16 get_next_vcnum(struct cifsSesInfo *ses)
+{
+        __u16 vcnum = 0;
+        struct list_head *tmp;
+        struct cifsSesInfo *tmp_ses;
+        __u16 max_vcs = ses->server->max_vcs;
+        __u16 i;
+        int free_vc_found = 0;
+
+        /* Quoting the MS-SMB specification: "Windows-based SMB servers set this
+        field to one but do not enforce this limit, which allows an SMB client
+        to establish more virtual circuits than allowed by this value ... but
+        other server implementations can enforce this limit." */
+        if (max_vcs < 2)
+                max_vcs = 0xFFFF;
+
+        write_lock(&cifs_tcp_ses_lock);
+        if ((ses->need_reconnect) && is_first_ses_reconnect(ses))
+                        goto get_vc_num_exit;  /* vcnum will be zero */
+        for (i = ses->server->srv_count - 1; i < max_vcs; i++) {
+                if (i == 0) /* this is the only connection, use vc 0 */
+                        break;
+
+                free_vc_found = 1;
+
+                list_for_each(tmp, &ses->server->smb_ses_list) {
+                        tmp_ses = list_entry(tmp, struct cifsSesInfo,
+                                             smb_ses_list);
+                        if (tmp_ses->vcnum == i) {
+                                free_vc_found = 0;
+                                break; /* found duplicate, try next vcnum */
+                        }
+                }
+                if (free_vc_found)
+                        break; /* we found a vcnumber that will work - use it */
+        }
+
+        if (i == 0)
+                vcnum = 0; /* for most common case, ie if one smb session, use
+                              vc zero.  Also for case when no free vcnum, zero
+                              is safest to send (some clients only send zero) */
+        else if (free_vc_found == 0)
+                vcnum = 1;  /* we can not reuse vc=0 safely, since some servers
+                                reset all uids on that, but 1 is ok. */
+        else
+                vcnum = i;
+        ses->vcnum = vcnum;
+get_vc_num_exit:
+        write_unlock(&cifs_tcp_ses_lock);
+
+        return le16_to_cpu(vcnum);
+}
+
 static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB)
 {
         __u32 capabilities = 0;
 
         /* init fields common to all four types of SessSetup */
-        /* note that header is initialized to zero in header_assemble */
+        /* Note that offsets for first seven fields in req struct are same  */
+        /*      in CIFS Specs so does not matter which of 3 forms of struct */
+        /*      that we use in next few lines                               */
+        /* Note that header is initialized to zero in header_assemble */
         pSMB->req.AndXCommand = 0xFF;
         pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
         pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
+        pSMB->req.VcNumber = get_next_vcnum(ses);
 
         /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
 
@@ -71,7 +155,6 @@ static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB)
         if (ses->capabilities & CAP_UNIX)
                 capabilities |= CAP_UNIX;
 
-        /* BB check whether to init vcnum BB */
         return capabilities;
 }
 
@@ -228,7 +311,7 @@ static int decode_unicode_ssetup(char **pbcc_area, int bleft,
 
         kfree(ses->serverOS);
         /* UTF-8 string will not grow more than four times as big as UCS-16 */
-        ses->serverOS = kzalloc(4 * len, GFP_KERNEL);
+        ses->serverOS = kzalloc((4 * len) + 2 /* trailing null */, GFP_KERNEL);
         if (ses->serverOS != NULL)
                 cifs_strfromUCS_le(ses->serverOS, (__le16 *)data, len, nls_cp);
         data += 2 * (len + 1);
@@ -241,7 +324,7 @@ static int decode_unicode_ssetup(char **pbcc_area, int bleft,
                 return rc;
 
         kfree(ses->serverNOS);
-        ses->serverNOS = kzalloc(4 * len, GFP_KERNEL); /* BB this is wrong length FIXME BB */
+        ses->serverNOS = kzalloc((4 * len) + 2 /* trailing null */, GFP_KERNEL);
         if (ses->serverNOS != NULL) {
                 cifs_strfromUCS_le(ses->serverNOS, (__le16 *)data, len,
                                    nls_cp);
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 9c6d815dd191..45e59d3c7f1f 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1913,6 +1913,9 @@ COMPATIBLE_IOCTL(FIONREAD)  /* This is also TIOCINQ */
 /* 0x00 */
 COMPATIBLE_IOCTL(FIBMAP)
 COMPATIBLE_IOCTL(FIGETBSZ)
+/* 'X' - originally XFS but some now in the VFS */
+COMPATIBLE_IOCTL(FIFREEZE)
+COMPATIBLE_IOCTL(FITHAW)
 /* RAID */
 COMPATIBLE_IOCTL(RAID_VERSION)
 COMPATIBLE_IOCTL(GET_ARRAY_INFO)
@@ -1938,6 +1941,8 @@ ULONG_IOCTL(SET_BITMAP_FILE)
 /* Big K */
 COMPATIBLE_IOCTL(PIO_FONT)
 COMPATIBLE_IOCTL(GIO_FONT)
+COMPATIBLE_IOCTL(PIO_CMAP)
+COMPATIBLE_IOCTL(GIO_CMAP)
 ULONG_IOCTL(KDSIGACCEPT)
 COMPATIBLE_IOCTL(KDGETKEYCODE)
 COMPATIBLE_IOCTL(KDSETKEYCODE)
diff --git a/fs/dcache.c b/fs/dcache.c
index 937df0fb0da5..07e2d4a44bda 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1180,7 +1180,7 @@ struct dentry *d_obtain_alias(struct inode *inode)
         iput(inode);
         return res;
 }
-EXPORT_SYMBOL_GPL(d_obtain_alias);
+EXPORT_SYMBOL(d_obtain_alias);
 
 /**
  * d_splice_alias - splice a disconnected dentry into the tree if one exists
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 9a50b8052dcf..de9459b4cb94 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -609,7 +609,9 @@ int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
  */
 int ext4_should_retry_alloc(struct super_block *sb, int *retries)
 {
-        if (!ext4_has_free_blocks(EXT4_SB(sb), 1) || (*retries)++ > 3)
+        if (!ext4_has_free_blocks(EXT4_SB(sb), 1) ||
+            (*retries)++ > 3 ||
+            !EXT4_SB(sb)->s_journal)
                 return 0;
 
         jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 4fb86a0061d0..627f8c3337a3 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -188,7 +188,7 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
         struct ext4_group_desc *gdp;
         struct ext4_super_block *es;
         struct ext4_sb_info *sbi;
-        int fatal = 0, err, count;
+        int fatal = 0, err, count, cleared;
         ext4_group_t flex_group;
 
         if (atomic_read(&inode->i_count) > 1) {
@@ -248,8 +248,10 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
                 goto error_return;
 
         /* Ok, now we can actually update the inode bitmaps.. */
-        if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group),
-                                        bit, bitmap_bh->b_data))
+        spin_lock(sb_bgl_lock(sbi, block_group));
+        cleared = ext4_clear_bit(bit, bitmap_bh->b_data);
+        spin_unlock(sb_bgl_lock(sbi, block_group));
+        if (!cleared)
                 ext4_error(sb, "ext4_free_inode",
                            "bit already cleared for inode %lu", ino);
         else {
@@ -715,6 +717,13 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, int mode)
 
         if (sbi->s_log_groups_per_flex) {
                 ret2 = find_group_flex(sb, dir, &group);
+                if (ret2 == -1) {
+                        ret2 = find_group_other(sb, dir, &group);
+                        if (ret2 == 0 && printk_ratelimit())
+                                printk(KERN_NOTICE "ext4: find_group_flex "
+                                       "failed, fallback succeeded dir %lu\n",
+                                       dir->i_ino);
+                }
                 goto got_group;
         }
 
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index cbd2ca99d113..c7fed5b18745 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1368,6 +1368,10 @@ retry:
                 goto out;
         }
 
+        /* We cannot recurse into the filesystem as the transaction is already
+         * started */
+        flags |= AOP_FLAG_NOFS;
+
         page = grab_cache_page_write_begin(mapping, index, flags);
         if (!page) {
                 ext4_journal_stop(handle);
@@ -1377,7 +1381,7 @@ retry:
         *pagep = page;
 
         ret = block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
-                                                        ext4_get_block);
+                                ext4_get_block);
 
         if (!ret && ext4_should_journal_data(inode)) {
                 ret = walk_page_buffers(handle, page_buffers(page),
@@ -2540,7 +2544,7 @@ retry:
 
                 ext4_journal_stop(handle);
 
-                if (mpd.retval == -ENOSPC) {
+                if ((mpd.retval == -ENOSPC) && sbi->s_journal) {
                         /* commit the transaction which would
                          * free blocks released in the transaction
                          * and try again
@@ -2667,6 +2671,9 @@ retry:
                 ret = PTR_ERR(handle);
                 goto out;
         }
+        /* We cannot recurse into the filesystem as the transaction is already
+         * started */
+        flags |= AOP_FLAG_NOFS;
 
         page = grab_cache_page_write_begin(mapping, index, flags);
         if (!page) {
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index a5732c58f676..39d1993cfa13 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3091,7 +3091,6 @@ static int ext4_freeze(struct super_block *sb)
 
                 /* Journal blocked and flushed, clear needs_recovery flag. */
                 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
-                ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
                 error = ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
                 if (error)
                         goto out;
diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c
index 3cceef4ad2b7..e9580104b6ba 100644
--- a/fs/jffs2/background.c
+++ b/fs/jffs2/background.c
@@ -95,13 +95,17 @@ static int jffs2_garbage_collect_thread(void *_c)
                         spin_unlock(&c->erase_completion_lock);
                         
 
-                /* This thread is purely an optimisation. But if it runs when
-                   other things could be running, it actually makes things a
-                   lot worse. Use yield() and put it at the back of the runqueue
-                   every time. Especially during boot, pulling an inode in
-                   with read_inode() is much preferable to having the GC thread
-                   get there first. */
-                yield();
+                /* Problem - immediately after bootup, the GCD spends a lot
+                 * of time in places like jffs2_kill_fragtree(); so much so
+                 * that userspace processes (like gdm and X) are starved
+                 * despite plenty of cond_resched()s and renicing.  Yield()
+                 * doesn't help, either (presumably because userspace and GCD
+                 * are generally competing for a higher latency resource -
+                 * disk).
+                 * This forces the GCD to slow the hell down.   Pulling an
+                 * inode in with read_inode() is much preferable to having
+                 * the GC thread get there first. */
+                schedule_timeout_interruptible(msecs_to_jiffies(50));
 
                 /* Put_super will send a SIGKILL and then wait on the sem.
                  */
diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index 6ca08ad887c0..1fc1e92356ee 100644
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -220,7 +220,7 @@ static int jffs2_add_tn_to_tree(struct jffs2_sb_info *c,
                                 struct jffs2_tmp_dnode_info *tn)
 {
         uint32_t fn_end = tn->fn->ofs + tn->fn->size;
-        struct jffs2_tmp_dnode_info *this;
+        struct jffs2_tmp_dnode_info *this, *ptn;
 
         dbg_readinode("insert fragment %#04x-%#04x, ver %u at %08x\n", tn->fn->ofs, fn_end, tn->version, ref_offset(tn->fn->raw));
 
@@ -251,11 +251,18 @@ static int jffs2_add_tn_to_tree(struct jffs2_sb_info *c,
         if (this) {
                 /* If the node is coincident with another at a lower address,
                    back up until the other node is found. It may be relevant */
-                while (this->overlapped)
-                        this = tn_prev(this);
-
-                /* First node should never be marked overlapped */
-                BUG_ON(!this);
+                while (this->overlapped) {
+                        ptn = tn_prev(this);
+                        if (!ptn) {
+                                /*
+                                 * We killed a node which set the overlapped
+                                 * flags during the scan. Fix it up.
+                                 */
+                                this->overlapped = 0;
+                                break;
+                        }
+                        this = ptn;
+                }
                 dbg_readinode("'this' found %#04x-%#04x (%s)\n", this->fn->ofs, this->fn->ofs + this->fn->size, this->fn ? "data" : "hole");
         }
 
@@ -360,7 +367,17 @@ static int jffs2_add_tn_to_tree(struct jffs2_sb_info *c,
                         }
                         if (!this->overlapped)
                                 break;
-                        this = tn_prev(this);
+
+                        ptn = tn_prev(this);
+                        if (!ptn) {
+                                /*
+                                 * We killed a node which set the overlapped
+                                 * flags during the scan. Fix it up.
+                                 */
+                                this->overlapped = 0;
+                                break;
+                        }
+                        this = ptn;
                 }
         }
 
@@ -456,8 +473,15 @@ static int jffs2_build_inode_fragtree(struct jffs2_sb_info *c,
                 eat_last(&rii->tn_root, &last->rb);
                 ver_insert(&ver_root, last);
 
-                if (unlikely(last->overlapped))
-                        continue;
+                if (unlikely(last->overlapped)) {
+                        if (pen)
+                                continue;
+                        /*
+                         * We killed a node which set the overlapped
+                         * flags during the scan. Fix it up.
+                         */
+                        last->overlapped = 0;
+                }
 
                 /* Now we have a bunch of nodes in reverse version
                    order, in the tree at ver_root. Most of the time,
diff --git a/fs/notify/inotify/inotify.c b/fs/notify/inotify/inotify.c
index dae3f28f30d4..331f2e88e284 100644
--- a/fs/notify/inotify/inotify.c
+++ b/fs/notify/inotify/inotify.c
@@ -156,7 +156,7 @@ static int inotify_handle_get_wd(struct inotify_handle *ih,
         int ret;
 
         do {
-                if (unlikely(!idr_pre_get(&ih->idr, GFP_KERNEL)))
+                if (unlikely(!idr_pre_get(&ih->idr, GFP_NOFS)))
                         return -ENOSPC;
                 ret = idr_get_new_above(&ih->idr, watch, ih->last_wd+1, &watch->wd);
         } while (ret == -EAGAIN);
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 60fe74035db5..3a9e5deed74d 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -4796,6 +4796,29 @@ out:
         return ret;
 }
 
+static int ocfs2_replace_extent_rec(struct inode *inode,
+                                    handle_t *handle,
+                                    struct ocfs2_path *path,
+                                    struct ocfs2_extent_list *el,
+                                    int split_index,
+                                    struct ocfs2_extent_rec *split_rec)
+{
+        int ret;
+
+        ret = ocfs2_path_bh_journal_access(handle, inode, path,
+                                           path_num_items(path) - 1);
+        if (ret) {
+                mlog_errno(ret);
+                goto out;
+        }
+
+        el->l_recs[split_index] = *split_rec;
+
+        ocfs2_journal_dirty(handle, path_leaf_bh(path));
+out:
+        return ret;
+}
+
 /*
  * Mark part or all of the extent record at split_index in the leaf
  * pointed to by path as written. This removes the unwritten
@@ -4885,7 +4908,9 @@ static int __ocfs2_mark_extent_written(struct inode *inode,
 
         if (ctxt.c_contig_type == CONTIG_NONE) {
                 if (ctxt.c_split_covers_rec)
-                        el->l_recs[split_index] = *split_rec;
+                        ret = ocfs2_replace_extent_rec(inode, handle,
+                                                       path, el,
+                                                       split_index, split_rec);
                 else
                         ret = ocfs2_split_and_insert(inode, handle, path, et,
                                                      &last_eb_bh, split_index,
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 54e182a27caf..0a2813947853 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -1849,12 +1849,12 @@ int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data,
                 if (!mle) {
                         if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN &&
                             res->owner != assert->node_idx) {
-                                mlog(ML_ERROR, "assert_master from "
-                                          "%u, but current owner is "
-                                          "%u! (%.*s)\n",
-                                       assert->node_idx, res->owner,
-                                       namelen, name);
-                                goto kill;
+                                mlog(ML_ERROR, "DIE! Mastery assert from %u, "
+                                     "but current owner is %u! (%.*s)\n",
+                                     assert->node_idx, res->owner, namelen,
+                                     name);
+                                __dlm_print_one_lock_resource(res);
+                                BUG();
                         }
                 } else if (mle->type != DLM_MLE_MIGRATION) {
                         if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN) {
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index d1295203029f..4060bb328bc8 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -181,8 +181,7 @@ static int dlm_purge_lockres(struct dlm_ctxt *dlm,
 
                 spin_lock(&res->spinlock);
                 /* This ensures that clear refmap is sent after the set */
-                __dlm_wait_on_lockres_flags(res, (DLM_LOCK_RES_SETREF_INPROG |
-                                                  DLM_LOCK_RES_MIGRATING));
+                __dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
                 spin_unlock(&res->spinlock);
 
                 /* clear our bit from the master's refmap, ignore errors */
diff --git a/fs/ocfs2/dlm/dlmunlock.c b/fs/ocfs2/dlm/dlmunlock.c
index 86ca085ef324..fcf879ed6930 100644
--- a/fs/ocfs2/dlm/dlmunlock.c
+++ b/fs/ocfs2/dlm/dlmunlock.c
@@ -117,11 +117,11 @@ static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm,
         else
                 BUG_ON(res->owner == dlm->node_num);
 
-        spin_lock(&dlm->spinlock);
+        spin_lock(&dlm->ast_lock);
         /* We want to be sure that we're not freeing a lock
          * that still has AST's pending... */
         in_use = !list_empty(&lock->ast_list);
-        spin_unlock(&dlm->spinlock);
+        spin_unlock(&dlm->ast_lock);
         if (in_use) {
                mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock "
                     "while waiting for an ast!", res->lockname.len,
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 206a2370876a..7219a86d34cc 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -320,9 +320,14 @@ static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
                                         struct ocfs2_lock_res *lockres);
 static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
                                                 int convert);
-#define ocfs2_log_dlm_error(_func, _err, _lockres) do {                 \
-        mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \
-             _err, _func, _lockres->l_name);                            \
+#define ocfs2_log_dlm_error(_func, _err, _lockres) do {                                 \
+        if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY)                               \
+                mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n",        \
+                     _err, _func, _lockres->l_name);                                    \
+        else                                                                            \
+                mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n",  \
+                     _err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name,  \
+                     (unsigned int)ocfs2_get_dentry_lock_ino(_lockres));                \
 } while (0)
 static int ocfs2_downconvert_thread(void *arg);
 static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 077384135f4e..946d3c34b90b 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -341,6 +341,9 @@ struct ocfs2_super
         struct ocfs2_node_map           osb_recovering_orphan_dirs;
         unsigned int                    *osb_orphan_wipes;
         wait_queue_head_t               osb_wipe_event;
+
+        /* used to protect metaecc calculation check of xattr. */
+        spinlock_t osb_xattr_lock;
 };
 
 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index b1cb38fbe807..7ac83a81ee55 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1537,6 +1537,13 @@ static int ocfs2_get_sector(struct super_block *sb,
         unlock_buffer(*bh);
         ll_rw_block(READ, 1, bh);
         wait_on_buffer(*bh);
+        if (!buffer_uptodate(*bh)) {
+                mlog_errno(-EIO);
+                brelse(*bh);
+                *bh = NULL;
+                return -EIO;
+        }
+
         return 0;
 }
 
@@ -1747,6 +1754,7 @@ static int ocfs2_initialize_super(struct super_block *sb,
         INIT_LIST_HEAD(&osb->blocked_lock_list);
         osb->blocked_lock_count = 0;
         spin_lock_init(&osb->osb_lock);
+        spin_lock_init(&osb->osb_xattr_lock);
         ocfs2_init_inode_steal_slot(osb);
 
         atomic_set(&osb->alloc_stats.moves, 0);
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 915039fffe6e..4ddd788add67 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -82,13 +82,14 @@ struct ocfs2_xattr_set_ctxt {
 
 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
 #define OCFS2_XATTR_INLINE_SIZE 80
+#define OCFS2_XATTR_HEADER_GAP  4
 #define OCFS2_XATTR_FREE_IN_IBODY       (OCFS2_MIN_XATTR_INLINE_SIZE \
                                          - sizeof(struct ocfs2_xattr_header) \
-                                         - sizeof(__u32))
+                                         - OCFS2_XATTR_HEADER_GAP)
 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr)  ((ptr)->i_sb->s_blocksize \
                                          - sizeof(struct ocfs2_xattr_block) \
                                          - sizeof(struct ocfs2_xattr_header) \
-                                         - sizeof(__u32))
+                                         - OCFS2_XATTR_HEADER_GAP)
 
 static struct ocfs2_xattr_def_value_root def_xv = {
         .xv.xr_list.l_count = cpu_to_le16(1),
@@ -274,10 +275,12 @@ static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
                                bucket->bu_blocks, bucket->bu_bhs, 0,
                                NULL);
         if (!rc) {
+                spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
                 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
                                                  bucket->bu_bhs,
                                                  bucket->bu_blocks,
                                                  &bucket_xh(bucket)->xh_check);
+                spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
                 if (rc)
                         mlog_errno(rc);
         }
@@ -310,9 +313,11 @@ static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
 {
         int i;
 
+        spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
         ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
                                    bucket->bu_bhs, bucket->bu_blocks,
                                    &bucket_xh(bucket)->xh_check);
+        spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 
         for (i = 0; i < bucket->bu_blocks; i++)
                 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
@@ -1507,7 +1512,7 @@ static int ocfs2_xattr_set_entry(struct inode *inode,
                 last += 1;
         }
 
-        free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
+        free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
         if (free < 0)
                 return -EIO;
 
@@ -2190,7 +2195,7 @@ static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
                 last += 1;
         }
 
-        free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
+        free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
         if (free < 0)
                 return 0;
 
@@ -2592,8 +2597,9 @@ static int __ocfs2_xattr_set_handle(struct inode *inode,
 
         if (!ret) {
                 /* Update inode ctime. */
-                ret = ocfs2_journal_access(ctxt->handle, inode, xis->inode_bh,
-                                           OCFS2_JOURNAL_ACCESS_WRITE);
+                ret = ocfs2_journal_access_di(ctxt->handle, inode,
+                                              xis->inode_bh,
+                                              OCFS2_JOURNAL_ACCESS_WRITE);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -5060,8 +5066,8 @@ try_again:
         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;
+        max_free = OCFS2_XATTR_BUCKET_SIZE - header_size -
+                le16_to_cpu(xh->xh_name_value_len) - OCFS2_XATTR_HEADER_GAP;
 
         mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
                         "of %u which exceed block size\n",
@@ -5094,7 +5100,7 @@ try_again:
                         need = 0;
         }
 
-        free = xh_free_start - header_size;
+        free = xh_free_start - header_size - OCFS2_XATTR_HEADER_GAP;
         /*
          * We need to make sure the new name/value pair
          * can exist in the same block.
@@ -5127,7 +5133,8 @@ try_again:
                         }
 
                         xh_free_start = le16_to_cpu(xh->xh_free_start);
-                        free = xh_free_start - header_size;
+                        free = xh_free_start - header_size
+                                - OCFS2_XATTR_HEADER_GAP;
                         if (xh_free_start % blocksize < need)
                                 free -= xh_free_start % blocksize;
 
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 3e76bb9b3ad6..d8bb5c671f42 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -485,8 +485,10 @@ struct inode *proc_get_inode(struct super_block *sb, unsigned int ino,
                         }
                 }
                 unlock_new_inode(inode);
-        } else
+        } else {
                module_put(de->owner);
+               de_put(de);
+        }
         return inode;
 
 out_ino:
diff --git a/fs/proc/page.c b/fs/proc/page.c
index 767d95a6d1b1..2d1345112a42 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -107,7 +107,7 @@ static ssize_t kpageflags_read(struct file *file, char __user *buf,
                 else
                         kflags = ppage->flags;
 
-                uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
+                uflags = kpf_copy_bit(kflags, KPF_LOCKED, PG_locked) |
                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 5267098532bf..a1a4cfe19210 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -48,8 +48,16 @@ int seq_open(struct file *file, const struct seq_operations *op)
          */
         file->f_version = 0;
 
-        /* SEQ files support lseek, but not pread/pwrite */
-        file->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
+        /*
+         * seq_files support lseek() and pread().  They do not implement
+         * write() at all, but we clear FMODE_PWRITE here for historical
+         * reasons.
+         *
+         * If a client of seq_files a) implements file.write() and b) wishes to
+         * support pwrite() then that client will need to implement its own
+         * file.open() which calls seq_open() and then sets FMODE_PWRITE.
+         */
+        file->f_mode &= ~FMODE_PWRITE;
         return 0;
 }
 EXPORT_SYMBOL(seq_open);
@@ -131,6 +139,22 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
         int err = 0;
 
         mutex_lock(&m->lock);
+
+        /* Don't assume *ppos is where we left it */
+        if (unlikely(*ppos != m->read_pos)) {
+                m->read_pos = *ppos;
+                while ((err = traverse(m, *ppos)) == -EAGAIN)
+                        ;
+                if (err) {
+                        /* With prejudice... */
+                        m->read_pos = 0;
+                        m->version = 0;
+                        m->index = 0;
+                        m->count = 0;
+                        goto Done;
+                }
+        }
+
         /*
          * seq_file->op->..m_start/m_stop/m_next may do special actions
          * or optimisations based on the file->f_version, so we want to
@@ -230,8 +254,10 @@ Fill:
 Done:
         if (!copied)
                 copied = err;
-        else
+        else {
                 *ppos += copied;
+                m->read_pos += copied;
+        }
         file->f_version = m->version;
         mutex_unlock(&m->lock);
         return copied;
@@ -266,16 +292,18 @@ loff_t seq_lseek(struct file *file, loff_t offset, int origin)
                         if (offset < 0)
                                 break;
                         retval = offset;
-                        if (offset != file->f_pos) {
+                        if (offset != m->read_pos) {
                                 while ((retval=traverse(m, offset)) == -EAGAIN)
                                         ;
                                 if (retval) {
                                         /* with extreme prejudice... */
                                         file->f_pos = 0;
+                                        m->read_pos = 0;
                                         m->version = 0;
                                         m->index = 0;
                                         m->count = 0;
                                 } else {
+                                        m->read_pos = offset;
                                         retval = file->f_pos = offset;
                                 }
                         }
diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
index c837dfc2b3c6..321728f48f2d 100644
--- a/fs/squashfs/block.c
+++ b/fs/squashfs/block.c
@@ -80,7 +80,7 @@ static struct buffer_head *get_block_length(struct super_block *sb,
  * generated a larger block - this does occasionally happen with zlib).
  */
 int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
-                        int length, u64 *next_index, int srclength)
+                        int length, u64 *next_index, int srclength, int pages)
 {
         struct squashfs_sb_info *msblk = sb->s_fs_info;
         struct buffer_head **bh;
@@ -185,6 +185,14 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
                         }
 
                         if (msblk->stream.avail_out == 0) {
+                                if (page == pages) {
+                                        ERROR("zlib_inflate tried to "
+                                                "decompress too much data, "
+                                                "expected %d bytes.  Zlib "
+                                                "data probably corrupt\n",
+                                                srclength);
+                                        goto release_mutex;
+                                }
                                 msblk->stream.next_out = buffer[page++];
                                 msblk->stream.avail_out = PAGE_CACHE_SIZE;
                         }
@@ -268,7 +276,8 @@ block_release:
                 put_bh(bh[k]);
 
 read_failure:
-        ERROR("sb_bread failed reading block 0x%llx\n", cur_index);
+        ERROR("squashfs_read_data failed to read block 0x%llx\n",
+                                        (unsigned long long) index);
         kfree(bh);
         return -EIO;
 }
diff --git a/fs/squashfs/cache.c b/fs/squashfs/cache.c
index f29eda16d25e..1c4739e33af6 100644
--- a/fs/squashfs/cache.c
+++ b/fs/squashfs/cache.c
@@ -119,7 +119,7 @@ struct squashfs_cache_entry *squashfs_cache_get(struct super_block *sb,
 
                         entry->length = squashfs_read_data(sb, entry->data,
                                 block, length, &entry->next_index,
-                                cache->block_size);
+                                cache->block_size, cache->pages);
 
                         spin_lock(&cache->lock);
 
@@ -406,7 +406,7 @@ int squashfs_read_table(struct super_block *sb, void *buffer, u64 block,
         for (i = 0; i < pages; i++, buffer += PAGE_CACHE_SIZE)
                 data[i] = buffer;
         res = squashfs_read_data(sb, data, block, length |
-                SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, length);
+                SQUASHFS_COMPRESSED_BIT_BLOCK, NULL, length, pages);
         kfree(data);
         return res;
 }
diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
index 7a63398bb855..9101dbde39ec 100644
--- a/fs/squashfs/inode.c
+++ b/fs/squashfs/inode.c
@@ -133,7 +133,8 @@ int squashfs_read_inode(struct inode *inode, long long ino)
         type = le16_to_cpu(sqshb_ino->inode_type);
         switch (type) {
         case SQUASHFS_REG_TYPE: {
-                unsigned int frag_offset, frag_size, frag;
+                unsigned int frag_offset, frag;
+                int frag_size;
                 u64 frag_blk;
                 struct squashfs_reg_inode *sqsh_ino = &squashfs_ino.reg;
 
@@ -175,7 +176,8 @@ int squashfs_read_inode(struct inode *inode, long long ino)
                 break;
         }
         case SQUASHFS_LREG_TYPE: {
-                unsigned int frag_offset, frag_size, frag;
+                unsigned int frag_offset, frag;
+                int frag_size;
                 u64 frag_blk;
                 struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;
 
diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
index 6b2515d027d5..0e9feb6adf7e 100644
--- a/fs/squashfs/squashfs.h
+++ b/fs/squashfs/squashfs.h
@@ -34,7 +34,7 @@ static inline struct squashfs_inode_info *squashfs_i(struct inode *inode)
 
 /* block.c */
 extern int squashfs_read_data(struct super_block *, void **, u64, int, u64 *,
-                                int);
+                                int, int);
 
 /* cache.c */
 extern struct squashfs_cache *squashfs_cache_init(char *, int, int);
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 071df5b5b491..681ec0d83799 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -389,7 +389,7 @@ static int __init init_squashfs_fs(void)
                 return err;
         }
 
-        printk(KERN_INFO "squashfs: version 4.0 (2009/01/03) "
+        printk(KERN_INFO "squashfs: version 4.0 (2009/01/31) "
                 "Phillip Lougher\n");
 
         return 0;
diff --git a/fs/super.c b/fs/super.c
index 61dce001dd57..8349ed6b1412 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -82,7 +82,22 @@ static struct super_block *alloc_super(struct file_system_type *type)
                  * lock ordering than usbfs:
                  */
                 lockdep_set_class(&s->s_lock, &type->s_lock_key);
-                down_write(&s->s_umount);
+                /*
+                 * sget() can have s_umount recursion.
+                 *
+                 * When it cannot find a suitable sb, it allocates a new
+                 * one (this one), and tries again to find a suitable old
+                 * one.
+                 *
+                 * In case that succeeds, it will acquire the s_umount
+                 * lock of the old one. Since these are clearly distrinct
+                 * locks, and this object isn't exposed yet, there's no
+                 * risk of deadlocks.
+                 *
+                 * Annotate this by putting this lock in a different
+                 * subclass.
+                 */
+                down_write_nested(&s->s_umount, SINGLE_DEPTH_NESTING);
                 s->s_count = S_BIAS;
                 atomic_set(&s->s_active, 1);
                 mutex_init(&s->s_vfs_rename_mutex);
diff --git a/fs/timerfd.c b/fs/timerfd.c
index 6a123b8ff3f5..b042bd7034b1 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -186,10 +186,9 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
         BUILD_BUG_ON(TFD_CLOEXEC != O_CLOEXEC);
         BUILD_BUG_ON(TFD_NONBLOCK != O_NONBLOCK);
 
-        if (flags & ~(TFD_CLOEXEC | TFD_NONBLOCK))
-                return -EINVAL;
-        if (clockid != CLOCK_MONOTONIC &&
-            clockid != CLOCK_REALTIME)
+        if ((flags & ~TFD_CREATE_FLAGS) ||
+            (clockid != CLOCK_MONOTONIC &&
+             clockid != CLOCK_REALTIME))
                 return -EINVAL;
 
         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
@@ -201,7 +200,7 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
         hrtimer_init(&ctx->tmr, clockid, HRTIMER_MODE_ABS);
 
         ufd = anon_inode_getfd("[timerfd]", &timerfd_fops, ctx,
-                               flags & (O_CLOEXEC | O_NONBLOCK));
+                               flags & TFD_SHARED_FCNTL_FLAGS);
         if (ufd < 0)
                 kfree(ctx);
 
@@ -219,7 +218,8 @@ SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
         if (copy_from_user(&ktmr, utmr, sizeof(ktmr)))
                 return -EFAULT;
 
-        if (!timespec_valid(&ktmr.it_value) ||
+        if ((flags & ~TFD_SETTIME_FLAGS) ||
+            !timespec_valid(&ktmr.it_value) ||
             !timespec_valid(&ktmr.it_interval))
                 return -EINVAL;
 
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index d71dc44e21ed..cb329edc925b 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -166,6 +166,75 @@ test_page_region(
 }
 
 /*
+ *      Mapping of multi-page buffers into contiguous virtual space
+ */
+
+typedef struct a_list {
+        void            *vm_addr;
+        struct a_list   *next;
+} a_list_t;
+
+static a_list_t         *as_free_head;
+static int              as_list_len;
+static DEFINE_SPINLOCK(as_lock);
+
+/*
+ *      Try to batch vunmaps because they are costly.
+ */
+STATIC void
+free_address(
+        void            *addr)
+{
+        a_list_t        *aentry;
+
+#ifdef CONFIG_XEN
+        /*
+         * Xen needs to be able to make sure it can get an exclusive
+         * RO mapping of pages it wants to turn into a pagetable.  If
+         * a newly allocated page is also still being vmap()ed by xfs,
+         * it will cause pagetable construction to fail.  This is a
+         * quick workaround to always eagerly unmap pages so that Xen
+         * is happy.
+         */
+        vunmap(addr);
+        return;
+#endif
+
+        aentry = kmalloc(sizeof(a_list_t), GFP_NOWAIT);
+        if (likely(aentry)) {
+                spin_lock(&as_lock);
+                aentry->next = as_free_head;
+                aentry->vm_addr = addr;
+                as_free_head = aentry;
+                as_list_len++;
+                spin_unlock(&as_lock);
+        } else {
+                vunmap(addr);
+        }
+}
+
+STATIC void
+purge_addresses(void)
+{
+        a_list_t        *aentry, *old;
+
+        if (as_free_head == NULL)
+                return;
+
+        spin_lock(&as_lock);
+        aentry = as_free_head;
+        as_free_head = NULL;
+        as_list_len = 0;
+        spin_unlock(&as_lock);
+
+        while ((old = aentry) != NULL) {
+                vunmap(aentry->vm_addr);
+                aentry = aentry->next;
+                kfree(old);
+        }
+}
+
+/*
  *      Internal xfs_buf_t object manipulation
  */
 
@@ -264,7 +333,7 @@ xfs_buf_free(
                 uint            i;
 
                 if ((bp->b_flags & XBF_MAPPED) && (bp->b_page_count > 1))
-                       vm_unmap_ram(bp->b_addr - bp->b_offset, bp->b_page_count);
+                        free_address(bp->b_addr - bp->b_offset);
 
                 for (i = 0; i < bp->b_page_count; i++) {
                         struct page     *page = bp->b_pages[i];
@@ -386,8 +455,10 @@ _xfs_buf_map_pages(
                 bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset;
                 bp->b_flags |= XBF_MAPPED;
         } else if (flags & XBF_MAPPED) {
-               bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count,
-                                       -1, PAGE_KERNEL);
+                if (as_list_len > 64)
+                        purge_addresses();
+                bp->b_addr = vmap(bp->b_pages, bp->b_page_count,
+                                        VM_MAP, PAGE_KERNEL);
                 if (unlikely(bp->b_addr == NULL))
                         return -ENOMEM;
                 bp->b_addr += bp->b_offset;
@@ -1672,6 +1743,8 @@ xfsbufd(
                         count++;
                 }
 
+                if (as_list_len > 0)
+                        purge_addresses();
                 if (count)
                         blk_run_address_space(target->bt_mapping);