This is a note to let you know that I've just added the patch titled
ext4: ignore journal checksum on remount; don't fail
to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-ignore-journal-checksum-on-remount-don-t-fail.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2d5b86e048780c5efa7f7d9708815555919e7b05 Mon Sep 17 00:00:00 2001
From: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Thu, 12 Feb 2015 23:07:37 -0500
Subject: ext4: ignore journal checksum on remount; don't fail
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From: Eric Sandeen <sandeen@xxxxxxxxxx>
commit 2d5b86e048780c5efa7f7d9708815555919e7b05 upstream.
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 <conradsand.arma@xxxxxxxxx>
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Cc: Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/super.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4864,9 +4864,8 @@ static int ext4_remount(struct super_blo
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) {
Patches currently in stable-queue which might be from sandeen@xxxxxxxxxx are
queue-3.19/ext4-ignore-journal-checksum-on-remount-don-t-fail.patch
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