[PATCH] ext2: Do not update mtime of a move directory when parent has not changed

[Jan Kara <jack@suse.cz>]

If the parent of the moved directory has not changed, there's no real
reason to change mtime. Specs doesn't seem to say anything about this
particular case and e.g. ext3 does not change mtime in this case.
So we become a tiny bit more consistent.

Spotted by ronny.pretzsch@dfs.de, initial fix by Jörn Engel <joern@logfs.org>.

CC: ronny.pretzsch@dfs.de
CC: hare@suse.de
Acked-by: Jörn Engel <joern@logfs.org>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/ext2/namei.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 90ea179..556f258 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -352,7 +352,10 @@ static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
 	inode_dec_link_count(old_inode);
 
 	if (dir_de) {
-		ext2_set_link(old_inode, dir_de, dir_page, new_dir);
+		/* Set link only if parent has changed and thus avoid setting
+		 * of mtime of the moved directory on a pure rename. */
+		if (old_dir != new_dir)
+			ext2_set_link(old_inode, dir_de, dir_page, new_dir);
 		inode_dec_link_count(old_dir);
 	}
 	return 0;
-- 
1.6.0.2

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