Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

Conflicts:
	drivers/net/wireless/iwlwifi/iwl-tx.c
	net/8021q/vlan_core.c
	net/core/dev.c

22 files changed, 444 insertions, 120 deletions

diff --git a/fs/bio.c b/fs/bio.c
index 72ab251cdb9c..124b95c4d582 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -302,7 +302,7 @@ 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 *p;
+        void *uninitialized_var(p);
 
         if (bs) {
                 p = mempool_alloc(bs->bio_pool, gfp_mask);
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.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/extent-tree.c b/fs/btrfs/extent-tree.c
index 0a5d796c9f7e..6b5966aacf44 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
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 872f104576e5..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);
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/compat_ioctl.c b/fs/compat_ioctl.c
index 4ea8a98b23df..ff786687e93b 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1918,6 +1918,9 @@ 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)
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/ialloc.c b/fs/ext4/ialloc.c
index 4fb86a0061d0..f18a919be70b 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -715,6 +715,13 @@ 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..51cdd13e1c31 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),
@@ -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/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/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/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) |