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From: Mark Tinguely <tinguely@sgi.com>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 18/18] xfs: use iolock on XFS_IOC_ALLOCSP calls
Date: Mon, 16 Apr 2012 10:10:48 -0500	[thread overview]
Message-ID: <4F8C3678.6030306@sgi.com> (raw)
In-Reply-To: <1334319061-12968-19-git-send-email-david@fromorbit.com>

On 04/13/12 07:11, Dave Chinner wrote:
> From: Dave Chinner<dchinner@redhat.com>
>
> fsstress has a particular effective way of stopping debug XFS
> kernels. We keep seeing assert failures due finding delayed
> allocation extents where there should be none. This shows up when
> extracting extent maps and we are holding all the locks we should be
> to prevent races, so this really makes no sense to see these errors.
>
> After checking that fsstress does not use mmap, it occurred to me
> that fsstress uses something that no sane application uses - the
> XFS_IOC_ALLOCSP ioctl interfaces for preallocation. These interfaces
> do allocation of blocks beyond EOF without using preallocation, and
> then call setattr to extend and zero the allocated blocks.
>
> THe problem here is this is a buffered write, and hence the
> allocation is a delayed allocation. Unlike the buffered IO path, the
> allocation and zeroing are not serialised using the IOLOCK. Hence
> the ALLOCSP operation can race with operations holding the iolock to
> prevent buffered IO operations from occurring.
>
> Signed-off-by: Dave Chinner<dchinner@redhat.com>
> Reviewed-by: Christoph Hellwig<hch@lst.de>
> ---


Looks good.

Reviewed-by: Mark Tinguely <tinguely@sgi.com>

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  reply	other threads:[~2012-04-16 15:10 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-13 12:10 [PATCH 0/18] xfs: current patch queue Dave Chinner
2012-04-13 12:10 ` [PATCH 01/18] xfs: Ensure inode reclaim can run during quotacheck Dave Chinner
2012-04-13 18:01   ` Mark Tinguely
2012-04-29 21:37   ` Christoph Hellwig
2012-04-13 12:10 ` [PATCH 02/18] xfs: pass shutdown method into xfs_trans_ail_delete_bulk Dave Chinner
2012-04-13 17:40   ` Mark Tinguely
2012-04-13 23:04     ` Dave Chinner
2012-04-13 23:38       ` [PATCH 02/18 V2] " Dave Chinner
2012-04-16 18:49         ` Mark Tinguely
2012-04-13 12:10 ` [PATCH 03/18] xfs: Do background CIL flushes via a workqueue Dave Chinner
2012-04-17 17:54   ` Mark Tinguely
2012-04-17 21:21   ` Ben Myers
2012-04-17 21:49     ` Ben Myers
2012-04-18  1:47       ` Dave Chinner
2012-04-30  1:24         ` Dave Chinner
2012-04-30  6:09           ` Dave Chinner
2012-04-18  1:58     ` Dave Chinner
2012-04-13 12:10 ` [PATCH 04/18] xfs: page type check in writeback only checks last buffer Dave Chinner
2012-04-16 16:15   ` Mark Tinguely
2012-04-29 21:39   ` Christoph Hellwig
2012-04-30  0:29     ` Dave Chinner
2012-04-13 12:10 ` [PATCH 05/18] xfs: Use preallocation for inodes with extsz hints Dave Chinner
2012-04-13 16:45   ` Mark Tinguely
2012-04-16 15:59   ` Mark Tinguely
2012-04-13 12:10 ` [PATCH 06/18] xfs: fix buffer lookup race on allocation failure Dave Chinner
2012-04-13 18:32   ` Mark Tinguely
2012-04-13 12:10 ` [PATCH 07/18] xfs: check for buffer errors before waiting Dave Chinner
2012-04-13 17:56   ` Mark Tinguely
2012-04-13 12:10 ` [PATCH 08/18] xfs: fix incorrect b_offset initialisation Dave Chinner
2012-04-13 12:10 ` [PATCH 09/18] xfs: use kmem_zone_zalloc for buffers Dave Chinner
2012-04-13 12:10 ` [PATCH 10/18] xfs: clean up buffer get/read call API Dave Chinner
2012-04-13 12:10 ` [PATCH 11/18] xfs: kill b_file_offset Dave Chinner
2012-04-13 12:10 ` [PATCH 12/18] xfs: use blocks for counting length of buffers Dave Chinner
2012-04-13 12:10 ` [PATCH 13/18] xfs: use blocks for storing the desired IO size Dave Chinner
2012-04-13 12:10 ` [PATCH 14/18] xfs: kill xfs_buf_btoc Dave Chinner
2012-04-13 12:10 ` [PATCH 15/18] xfs: kill XBF_LOCK Dave Chinner
2012-04-13 21:20   ` Mark Tinguely
2012-04-13 12:10 ` [PATCH 16/18] xfs: kill xfs_read_buf() Dave Chinner
2012-04-13 12:11 ` [PATCH 17/18] xfs: kill XBF_DONTBLOCK Dave Chinner
2012-04-16 14:34   ` Mark Tinguely
2012-04-13 12:11 ` [PATCH 18/18] xfs: use iolock on XFS_IOC_ALLOCSP calls Dave Chinner
2012-04-16 15:10   ` Mark Tinguely [this message]
2012-04-16 21:29 ` [PATCH 0/18] xfs: current patch queue Ben Myers
2012-04-17  4:12   ` Dave Chinner
2012-04-17 14:44     ` Ben Myers

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