From: Theodore Ts'o <tytso@mit.edu>
Date: Thu, 14 May 2015 22:19:01 +0000 (-0400)
Subject: ext4: fix lazytime optimization
X-Git-Tag: v4.0.5~64
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=11395c8b1918476a402ff74d8d5c6eb1cefc7e30;p=thirdparty%2Fkernel%2Fstable.git

ext4: fix lazytime optimization

commit 8f4d855839179f410fa910a26eb81d646d628f26 upstream.

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

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 852cc521f327a..1f252b4e0f51d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4233,7 +4233,7 @@ 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;