Btrfs: Fix i_blocks accounting

[linux-2.6-block.git] / fs / btrfs / ctree.h

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index dfb700efcd6bb7e021df039a8066c8779bee7223..52144b04f1af100ee2ad2f927a38da18c6a21fe4 100644 (file)
--- 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);