Re: ext4 lazytime: ctime of some files changed

[Theodore Ts'o <tytso@mit.edu>]

On Wed, May 13, 2015 at 06:20:35PM +0200, Jörg-Volker Peetz wrote:
> 
> Thereafter, the two emacs package files again had a wrong mtime (which by the
> way shows when I start emacs).
> 
> Could this be due to the lazytime mount option?

I think I found the problem.  My bad.  Can you verify that this solves
the problem for you?

From 8f4d855839179f410fa910a26eb81d646d628f26 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Thu, 14 May 2015 18:19:01 -0400
Subject: [PATCH] ext4: fix lazytime optimization

We had a fencepost error in the lazytime optimization which means that
timestamp would get written to the wrong inode.

Cc: stable@vger.kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
 fs/ext4/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 55b187c..0554b0b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4345,7 +4345,7 @@ static void ext4_update_other_inodes_time(struct super_block *sb,
 	int inode_size = EXT4_INODE_SIZE(sb);
 
 	oi.orig_ino = orig_ino;
-	ino = orig_ino & ~(inodes_per_block - 1);
+	ino = (orig_ino & ~(inodes_per_block - 1)) + 1;
 	for (i = 0; i < inodes_per_block; i++, ino++, buf += inode_size) {
 		if (ino == orig_ino)
 			continue;
-- 
2.3.0

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