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| author | Michael Tokarev <mjt@tls.msk.ru> | 2012-12-25 14:08:16 -0500 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-01-16 01:13:12 +0000 |
| commit | ad74aa67b8cf06b159cf72b08efe42533db49685 (patch) | |
| tree | 16dd893099032287306cbfd949df86ecf36070a2 | |
| parent | c53ed31e4e663833a8e7ccb06ab0358ff1507a87 (diff) | |
ext4: do not try to write superblock on ro remount w/o journal
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 <mjt@tls.msk.ru>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | fs/ext4/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 4e03de4da83..24ac7a29349 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4654,7 +4654,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) } 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 |