f2fs: update several comments

Update several comments:
1. use f2fs_{un}lock_op install of mutex_{un}lock_op.
2. update comment of get_data_block().
3. update description of node offset.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 0cc26ba07c3b..28206109a293 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -432,8 +432,8 @@ next:
 }
 
 /*
- * Caller should grab and release a mutex by calling mutex_lock_op() and
- * mutex_unlock_op().
+ * Caller should grab and release a rwsem by calling f2fs_lock_op() and
+ * f2fs_unlock_op().
  */
 int __f2fs_add_link(struct inode *dir, const struct qstr *name, struct inode *inode)
 {