From: Dave Chinner <david@fromorbit.com>
To: Jan Kara <jack@suse.cz>
Cc: linux-fsdevel@vger.kernel.org, Eric Sandeen <sandeen@sandeen.net>,
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 2/8] vfs: Protect write paths by sb_start_write - sb_end_write
Date: Tue, 24 Jan 2012 19:21:19 +1100 [thread overview]
Message-ID: <20120124082119.GO15102@dastard> (raw)
In-Reply-To: <1327091686-23177-3-git-send-email-jack@suse.cz>
On Fri, Jan 20, 2012 at 09:34:40PM +0100, Jan Kara wrote:
> There are three entry points which dirty pages in a filesystem. mmap (handled
> by block_page_mkwrite()), buffered write (handled by
> __generic_file_aio_write()), and truncate (it can dirty last partial page -
> handled inside each filesystem separately). Protect these places with
> sb_start_write() and sb_end_write().
fallocate can also dirty pages, either during preallocation or hole
punching. Hence if you are going to promote truncate to
SB_FREEZE_WRITE protection then you need to promote everything else
that can zero partial blocks as well.
That also means that anything the has implemented XFS_IOC_ ioctl
interfaces for prellocation and hole punching (xfs, ocfs2 and gfs2
IIRC) also needs to be protected in the same way.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2012-01-24 8:21 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 [this message]
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
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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