1 files changed, 9 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index dfb700efcd6b..52144b04f1af 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1161,6 +1161,15 @@ int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
                         struct btrfs_root *root, struct btrfs_path *path,
                         u64 isize);
 /* inode.c */
+static inline void dec_i_blocks(struct inode *inode, u64 dec)
+{
+        dec = dec >> 9;
+        if (dec <= inode->i_blocks)
+                inode->i_blocks -= dec;
+        else
+                inode->i_blocks = 0;
+}
+
 unsigned long btrfs_force_ra(struct address_space *mapping,
                               struct file_ra_state *ra, struct file *file,
                               pgoff_t offset, pgoff_t last_index);