diff options
authorEric Sandeen <>2015-02-12 23:07:37 -0500
committerTheodore Ts'o <>2015-02-12 23:07:37 -0500
commit2d5b86e048780c5efa7f7d9708815555919e7b05 (patch)
parentb94a8b36be4e74d8caff387fadf71f9f97c2ea69 (diff)
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 <>
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 2ecce86..bff3427 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) {