This is a note to let you know that I've just added the patch titled
ext4: do not try to write superblock on ro remount w/o journal
to the 3.0-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-do-not-try-to-write-superblock-on-ro-remount-w-o-journal.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From d096ad0f79a782935d2e06ae8fb235e8c5397775 Mon Sep 17 00:00:00 2001
From: Michael Tokarev <[email protected]>
Date: Tue, 25 Dec 2012 14:08:16 -0500
Subject: ext4: do not try to write superblock on ro remount w/o journal
From: Michael Tokarev <[email protected]>
commit d096ad0f79a782935d2e06ae8fb235e8c5397775 upstream.
When a journal-less ext4 filesystem is mounted on a read-only block
device (blockdev --setro will do), each remount (for other, unrelated,
flags, like suid=>nosuid etc) results in a series of scary messages
from kernel telling about I/O errors on the device.
This is becauese of the following code ext4_remount():
if (sbi->s_journal == NULL)
ext4_commit_super(sb, 1);
at the end of remount procedure, which forces writing (flushing) of
a superblock regardless whenever it is dirty or not, if the filesystem
is readonly or not, and whenever the device itself is readonly or not.
We only need call ext4_commit_super when the file system had been
previously mounted read/write.
Thanks to Eric Sandeen for help in diagnosing this issue.
Signed-off-By: Michael Tokarev <[email protected]>
Signed-off-by: "Theodore Ts'o" <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/ext4/super.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4438,7 +4438,7 @@ static int ext4_remount(struct super_blo
}
ext4_setup_system_zone(sb);
- if (sbi->s_journal == NULL)
+ if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
ext4_commit_super(sb, 1);
#ifdef CONFIG_QUOTA
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/ext4-do-not-try-to-write-superblock-on-ro-remount-w-o-journal.patch
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