From: Christoph Hellwig <hch@lst.de>
To: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 1/2] block: Fix too early free in multiwrite
Date: Fri, 2 Jul 2010 11:38:36 +0200 [thread overview]
Message-ID: <20100702093836.GA21116@lst.de> (raw)
In-Reply-To: <1277994718-14443-2-git-send-email-kwolf@redhat.com>
On Thu, Jul 01, 2010 at 04:31:57PM +0200, Kevin Wolf wrote:
> bdrv_aio_writev may call the callback immediately (and it will commonly do so
> in error cases). If num_requests doesn't have its final value yet,
> multiwrite_cb will falsely detect that all requests are completed and frees
> the mcb. However, the mcb is still used by other requests that are started only
> afterwards. When all requests are completed, it is freed for the second time.
>
> Fix this by setting the right num_requests from the beginning.
Looks good,
Reviewed-by: Christoph Hellwig <hch@lst.de>
next prev parent reply other threads:[~2010-07-02 9:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-01 14:31 [Qemu-devel] [PATCH 0/2] block: Fix multiwrite error handling Kevin Wolf
2010-07-01 14:31 ` [Qemu-devel] [PATCH 1/2] block: Fix too early free in multiwrite Kevin Wolf
2010-07-02 8:10 ` Stefan Hajnoczi
2010-07-02 9:38 ` Christoph Hellwig [this message]
2010-07-01 14:31 ` [Qemu-devel] [PATCH 2/2] block: Handle multiwrite errors only when all requests have completed Kevin Wolf
2010-07-02 8:33 ` Stefan Hajnoczi
2010-07-02 9:40 ` Christoph Hellwig
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