Add a per-inode lock around btrfs_drop_extents
btrfs_drop_extents is always called with a range lock held on the inode.
But, it may operate on extents outside that range as it drops and splits
them.
This patch adds a per-inode mutex that is held while calling
btrfs_drop_extents and while inserting new extents into the tree. It
prevents races from two procs working against adjacent ranges in the tree.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 81c0444..3bf4059 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -32,6 +32,7 @@
struct extent_io_tree io_tree;
struct extent_io_tree io_failure_tree;
struct mutex csum_mutex;
+ struct mutex extent_mutex;
struct inode vfs_inode;
struct btrfs_ordered_inode_tree ordered_tree;