From: Eric Sandeen Date: Fri, 13 Feb 2015 04:07:37 +0000 (-0500) Subject: ext4: ignore journal checksum on remount; don't fail X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2d5b86e048780c5efa7f7d9708815555919e7b05;p=linux-beck.git ext4: ignore journal checksum on remount; don't fail As of v3.18, ext4 started rejecting a remount which changes the journal_checksum option. Prior to that, it was simply ignored; the problem here is that if someone has this in their fstab for the root fs, now the box fails to boot properly, because remount of root with the new options will fail, and the box proceeds with a readonly root. I think it is a little nicer behavior to accept the option, but warn that it's being ignored, rather than failing the mount, but that might be a subjective matter... Reported-by: Cónräd Signed-off-by: Eric Sandeen Signed-off-by: Theodore Ts'o --- diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 2ecce8644cf8..bff3427784ca 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4858,9 +4858,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^ test_opt(sb, JOURNAL_CHECKSUM)) { ext4_msg(sb, KERN_ERR, "changing journal_checksum " - "during remount not supported"); - err = -EINVAL; - goto restore_opts; + "during remount not supported; ignoring"); + sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM; } if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {