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-rw-r--r--fs/btrfs/btrfs_inode.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 8494f62f8aa4..b4c09a12659c 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -50,7 +50,8 @@ struct btrfs_inode {
/*
* Lock for counters and all fields used to determine if the inode is in
* the log or not (last_trans, last_sub_trans, last_log_commit,
- * logged_trans).
+ * logged_trans), to access/update new_delalloc_bytes and to update the
+ * VFS' inode number of bytes used.
*/
spinlock_t lock;