From: Tao Ma Date: Thu, 20 Sep 2012 15:35:38 +0000 (-0400) Subject: ext4: remove erroneous ext4_superblock_csum_set() in update_backups() X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=bef53b01faeb791e27605cba1a71ba21364cb23e;p=openwrt%2Fstaging%2Fblogic.git ext4: remove erroneous ext4_superblock_csum_set() in update_backups() The update_backups() function is used to backup all the metadata blocks, so we should not take it for granted that 'data' is pointed to a super block and use ext4_superblock_csum_set to calculate the checksum there. In case where the data is a group descriptor block, it will corrupt the last group descriptor, and then e2fsck will complain about it it. As all the metadata checksums should already be OK when we do the backup, remove the wrong ext4_superblock_csum_set and it should be just fine. Reported-by: "Theodore Ts'o" Signed-off-by: Tao Ma Signed-off-by: "Theodore Ts'o" Cc: stable@vger.kernel.org --- diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index ee985ca05100..9f821ce39800 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1049,8 +1049,6 @@ static void update_backups(struct super_block *sb, int blk_off, char *data, goto exit_err; } - ext4_superblock_csum_set(sb, (struct ext4_super_block *)data); - if (meta_bg == 0) { group = ext4_list_backups(sb, &three, &five, &seven); last = sbi->s_groups_count;