vfs: add explanation of I_DIRTY_DATASYNC bit

Add explanation of I_DIRTY_DATASYNC bit.

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Joern Engel <joern@logfs.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 18cfbf76ec5b..98ffb6ead434 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1284,8 +1284,10 @@ struct super_operations {
  *
  * I_DIRTY_SYNC         Inode is dirty, but doesn't have to be written on
  *                      fdatasync().  i_atime is the usual cause.
- * I_DIRTY_DATASYNC     Inode is dirty and must be written on fdatasync(), f.e.
- *                      because i_size changed.
+ * I_DIRTY_DATASYNC     Data-related inode changes pending. We keep track of
+ *                      these changes separately from I_DIRTY_SYNC so that we
+ *                      don't have to write inode on fdatasync() when only
+ *                      mtime has changed in it.
  * I_DIRTY_PAGES        Inode has dirty pages.  Inode itself may be clean.
  * I_NEW                get_new_inode() sets i_state to I_LOCK|I_NEW.  Both
  *                      are cleared by unlock_new_inode(), called from iget().