From: Eric Sandeen <sandeen@sandeen.net>
To: Jan Kara <jack@suse.cz>
Cc: linux-fsdevel@vger.kernel.org, Dave Chinner <dchinner@redhat.com>,
Surbhi Palande <csurbhi@gmail.com>,
Kamal Mostafa <kamal@canonical.com>,
Christoph Hellwig <hch@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
xfs@oss.sgi.com, linux-ext4@vger.kernel.org
Subject: Re: [PATCH 6/8] xfs: Use generic writers counter instead of m_active_trans counter
Date: Fri, 03 Feb 2012 20:42:56 -0600 [thread overview]
Message-ID: <4F2C9B30.1030902@sandeen.net> (raw)
In-Reply-To: <1327091686-23177-7-git-send-email-jack@suse.cz>
On 1/20/12 2:34 PM, Jan Kara wrote:
> m_active_trans counter is racy wrt filesystem freezing. The patch replaces it
> with generic counter of running transactions which is properly synchronized
> with filesystem freezing. Things are a bit more complex because we need to log
> a dummy transaction and free block counters after the filesystem is frozen so
> we need to pass information to _xfs_trans_alloc() whether the transaction is
> part of filesystem freezing or not.
>
> Signed-off-by: Jan Kara <jack@suse.cz>
> ---
...
> xfs_trans_t *
> _xfs_trans_alloc(
> xfs_mount_t *mp,
> uint type,
> - uint memflags)
> + uint memflags,
> + bool freezing)
> {
> xfs_trans_t *tp;
>
> - atomic_inc(&mp->m_active_trans);
> -
> + if (!freezing)
> + sb_start_write(mp->m_super, SB_FREEZE_TRANS);
> + else
> + WARN_ON(xfs_test_for_freeze(mp) != SB_FREEZE_TRANS);
Hm this could be an issue because for both the umount path and the
freeze / xfs_quiesce_attr path, we call xfs_log_sbcount which sends
"true" for freezing and we'll trip up here because we won't be
in SB_FREEZE_TRANS during umount.
I think we have to push the flag all the way up to xfs_log_sbcount
callers?
-Eric
next prev parent reply other threads:[~2012-02-04 2:43 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-20 20:34 [PATCH 0/8] Fix filesystem freezing Jan Kara
2012-01-20 20:34 ` [PATCH 1/8] fs: Improve filesystem freezing handling Jan Kara
2012-02-04 3:03 ` Eric Sandeen
2012-02-06 15:17 ` Jan Kara
2012-01-20 20:34 ` [PATCH 2/8] vfs: Protect write paths by sb_start_write - sb_end_write Jan Kara
2012-01-24 8:21 ` Dave Chinner
2012-01-24 11:44 ` Jan Kara
2012-02-05 6:13 ` Eric Sandeen
2012-02-06 15:33 ` Jan Kara
2012-01-20 20:34 ` [PATCH 3/8] ext4: Protect ext4_page_mkwrite & ext4_setattr with " Jan Kara
2012-01-20 20:34 ` [PATCH 4/8] xfs: Move ilock before transaction start in xfs_setattr_size() Jan Kara
2012-01-24 6:59 ` Dave Chinner
2012-01-24 11:52 ` Jan Kara
2012-01-20 20:34 ` [PATCH 5/8] xfs: Protect xfs_file_aio_write() & xfs_setattr_size() with sb_start_write - sb_end_write Jan Kara
2012-01-24 7:19 ` Dave Chinner
2012-01-24 19:35 ` Jan Kara
2012-02-04 4:30 ` Eric Sandeen
2012-02-04 4:50 ` Eric Sandeen
2012-02-05 23:11 ` Dave Chinner
2012-01-20 20:34 ` [PATCH 6/8] xfs: Use generic writers counter instead of m_active_trans counter Jan Kara
2012-01-24 8:05 ` Dave Chinner
2012-02-04 2:13 ` Eric Sandeen
2012-02-04 2:42 ` Eric Sandeen [this message]
2012-02-04 4:34 ` Eric Sandeen
2012-01-20 20:34 ` [PATCH 7/8] Documentation: Correct s_umount state for freeze_fs/unfreeze_fs Jan Kara
2012-01-20 20:34 ` [PATCH 8/8] vfs: Document s_frozen state through freeze_super Jan Kara
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