Btrfs: Take the extent lock before dropping the delalloc bits
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 1a47251..51466dc 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -765,9 +765,13 @@
if (start_pos < inode->i_size) {
u64 last_pos;
last_pos = (index + num_pages) << PAGE_CACHE_SHIFT;
+ lock_extent(&BTRFS_I(inode)->io_tree,
+ start_pos, last_pos - 1, GFP_NOFS);
clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos,
last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC,
GFP_NOFS);
+ unlock_extent(&BTRFS_I(inode)->io_tree,
+ start_pos, last_pos - 1, GFP_NOFS);
}
return 0;
}