From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Jan Kara <jack@suse.cz>
Cc: axboe@kernel.dk, lucho@ionkov.net, ericvh@gmail.com,
tytso@mit.edu, rminnich@sandia.gov, viro@zeniv.linux.org.uk,
martin.petersen@oracle.com, neilb@suse.de, david@fromorbit.com,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
adilger.kernel@dilger.ca, bharrosh@panasas.com,
jlayton@samba.org, v9fs-developer@lists.sourceforge.net,
linux-ext4@vger.kernel.org
Subject: Re: [PATCH 4/4] ext3: Warn if mounting rw on a disk requiring stable page writes
Date: Wed, 21 Nov 2012 13:13:19 -0800 [thread overview]
Message-ID: <20121121211319.GA32202@blackbox.djwong.org> (raw)
In-Reply-To: <20121121021543.GI10507@quack.suse.cz>
On Wed, Nov 21, 2012 at 03:15:43AM +0100, Jan Kara wrote:
> On Tue 20-11-12 18:00:56, Darrick J. Wong wrote:
> > ext3 doesn't properly isolate pages from changes during writeback. Since the
> > recommended fix is to use ext4, for now we'll just print a warning if the user
> > tries to mount in write mode.
> >
> > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> > ---
> > fs/ext3/super.c | 8 ++++++++
> > 1 file changed, 8 insertions(+)
> >
> >
> > diff --git a/fs/ext3/super.c b/fs/ext3/super.c
> > index 5366393..5b3725d 100644
> > --- a/fs/ext3/super.c
> > +++ b/fs/ext3/super.c
> > @@ -1325,6 +1325,14 @@ static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
> > "forcing read-only mode");
> > res = MS_RDONLY;
> > }
> > + if (!read_only &&
> > + queue_requires_stable_pages(bdev_get_queue(sb->s_bdev))) {
> > + ext3_msg(sb, KERN_ERR,
> > + "error: ext3 cannot safely write data to a disk "
> > + "requiring stable pages writes; forcing read-only "
> > + "mode. Upgrading to ext4 is recommended.");
> > + res = MS_RDONLY;
> > + }
> > if (read_only)
> > return res;
> > if (!(sbi->s_mount_state & EXT3_VALID_FS))
> Why this? ext3 should be fixed by your change to
> filemap_page_mkwrite()... Or does testing show otherwise?
Yes, it's still broken even with this new set of changes. Now that I think
about it a little more, I recall that writeback mode was actually fine, so this
is a little harsh.
Hm... looking at the ordered code a little more, it looks like
ext3_ordered_write_end is calling journal_dirty_data_fn, which (I guess?) tries
to write mapped buffers back through the journal? Taking it out seems to fix
ordered mode, though I have a suspicion that it might very well break ordered
mode too.
--D
>
> Honza
> --
> Jan Kara <jack@suse.cz>
> SUSE Labs, CR
> --
> To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
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next prev parent reply other threads:[~2012-11-21 21:15 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-21 2:00 [PATCH v2.1 0/3] mm/fs: Implement faster stable page writes on filesystems Darrick J. Wong
2012-11-21 2:00 ` [PATCH 1/4] bdi: Track users that require stable page writes Darrick J. Wong
2012-11-21 7:54 ` Christoph Hellwig
2012-11-21 10:52 ` Christoph Hellwig
2012-11-21 10:56 ` Christoph Hellwig
2012-11-21 21:52 ` Darrick J. Wong
2012-11-21 22:06 ` NeilBrown
2012-11-22 2:33 ` [PATCH] " Darrick J. Wong
2012-11-22 7:08 ` Christoph Hellwig
2012-11-21 2:00 ` [PATCH 2/4] mm: Only enforce stable page writes if the backing device requires it Darrick J. Wong
2012-11-21 10:57 ` Christoph Hellwig
2012-11-21 2:00 ` [PATCH 3/4] 9pfs: Fix filesystem to wait for stable page writeback Darrick J. Wong
2012-11-21 2:00 ` [PATCH 4/4] ext3: Warn if mounting rw on a disk requiring stable page writes Darrick J. Wong
2012-11-21 2:15 ` Jan Kara
2012-11-21 21:13 ` Darrick J. Wong [this message]
2012-11-21 21:33 ` Jan Kara
2012-11-21 21:47 ` NeilBrown
2012-11-22 1:47 ` Darrick J. Wong
2012-11-22 2:36 ` [RFC PATCH 1/2] mm: Introduce page flag to indicate stable page status Darrick J. Wong
2012-11-22 2:36 ` [RFC PATCH 2/2] jbd: Stabilize pages during writes when in ordered mode Darrick J. Wong
2012-11-22 9:19 ` Jan Kara
2012-11-22 9:12 ` [PATCH 4/4] ext3: Warn if mounting rw on a disk requiring stable page writes Jan Kara
2012-11-27 2:17 ` Darrick J. Wong
2012-12-05 12:12 ` Jan Kara
2012-12-08 1:09 ` Darrick J. Wong
2012-12-10 10:41 ` Jan Kara
2012-11-22 23:15 ` Dave Chinner
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