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From: Jens Axboe <axboe@kernel.dk>
To: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	linux-xfs@oss.sgi.com, Tejun Heo <tj@kernel.org>,
	sandeen@sandeen.net, Kent Overstreet <kent.overstreet@gmail.com>
Subject: Re: [PATCH] bio allocation failure due to bio_get_nr_vecs()
Date: Fri, 11 May 2012 16:36:39 +0200	[thread overview]
Message-ID: <4FAD23F7.2080605@kernel.dk> (raw)
In-Reply-To: <4FAD18D4.3090102@itwm.fraunhofer.de>

On 05/11/2012 03:49 PM, Bernd Schubert wrote:
> The number of bio_get_nr_vecs() is passed down via bio_alloc() to
> bvec_alloc_bs(), which fails the bio allocation if
> nr_iovecs > BIO_MAX_PAGES. For the underlying caller this causes an
> unexpected bio allocation failure.
> Limiting to queue_max_segments() is not sufficient, as max_segments
> also might be very large.
> 
> bvec_alloc_bs(gfp_mask, nr_iovecs, ) => NULL when nr_iovecs  > BIO_MAX_PAGES
> bio_alloc_bioset(gfp_mask, nr_iovecs, ...)
> bio_alloc(GFP_NOIO, nvecs)
> xfs_alloc_ioend_bio()

Thanks, looks sane. Applied.

-- 
Jens Axboe

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xfs@oss.sgi.com
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WARNING: multiple messages have this Message-ID (diff)
From: Jens Axboe <axboe@kernel.dk>
To: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	linux-xfs@oss.sgi.com, sandeen@sandeen.net,
	Kent Overstreet <kent.overstreet@gmail.com>,
	Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH] bio allocation failure due to bio_get_nr_vecs()
Date: Fri, 11 May 2012 16:36:39 +0200	[thread overview]
Message-ID: <4FAD23F7.2080605@kernel.dk> (raw)
In-Reply-To: <4FAD18D4.3090102@itwm.fraunhofer.de>

On 05/11/2012 03:49 PM, Bernd Schubert wrote:
> The number of bio_get_nr_vecs() is passed down via bio_alloc() to
> bvec_alloc_bs(), which fails the bio allocation if
> nr_iovecs > BIO_MAX_PAGES. For the underlying caller this causes an
> unexpected bio allocation failure.
> Limiting to queue_max_segments() is not sufficient, as max_segments
> also might be very large.
> 
> bvec_alloc_bs(gfp_mask, nr_iovecs, ) => NULL when nr_iovecs  > BIO_MAX_PAGES
> bio_alloc_bioset(gfp_mask, nr_iovecs, ...)
> bio_alloc(GFP_NOIO, nvecs)
> xfs_alloc_ioend_bio()

Thanks, looks sane. Applied.

-- 
Jens Axboe


  parent reply	other threads:[~2012-05-11 14:36 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-10 15:45 kernel panic / NULL pointer dereference Bernd Schubert
2012-05-10 16:17 ` Eric Sandeen
2012-05-10 16:43 ` Bernd Schubert
2012-05-10 16:43   ` Bernd Schubert
2012-05-11 13:49   ` [PATCH] bio allocation failure due to bio_get_nr_vecs() Bernd Schubert
2012-05-11 13:49     ` Bernd Schubert
2012-05-11 14:06     ` Jeff Moyer
2012-05-11 14:06       ` Jeff Moyer
2012-05-11 14:31       ` Bernd Schubert
2012-05-11 14:31         ` Bernd Schubert
2012-05-11 14:36       ` Jens Axboe
2012-05-11 14:36         ` Jens Axboe
2012-05-11 16:29         ` Jeff Moyer
2012-05-11 16:29           ` Jeff Moyer
2012-05-11 14:36     ` Jens Axboe [this message]
2012-05-11 14:36       ` Jens Axboe
2012-05-11 14:44       ` Bernd Schubert
2012-05-11 14:44         ` Bernd Schubert
2012-05-11 14:45         ` Jens Axboe
2012-05-11 14:45           ` Jens Axboe

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