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authorJan Kara <jack@suse.cz>2008-02-14 19:31:32 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-14 20:58:06 -0800
commit000cb48ee18165776b5a2beb72ed18f66bc61878 (patch)
tree0f2f689f93c5ef08641d659c8b624e23ebbca8db
parent0778361837bfaaa0bcf9ee79f0edd10e3a220899 (diff)
downloadlinux-2.6.34-ux500-000cb48ee18165776b5a2beb72ed18f66bc61878.tar.gz
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>
-rw-r--r--include/linux/fs.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 18cfbf76ec5..98ffb6ead43 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().