linux-kernel - Re: [PATCH v3] fs/direct-io.c: don't try to allocate more than BIO_MAX

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Message-ID: <4D370902.2020501@panasas.com>
Date:	Wed, 19 Jan 2011 17:53:38 +0200
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	David Dillow <dillowda@...l.gov>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Jeff Moyer <jmoyer@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v3]  fs/direct-io.c: don't try to allocate more than BIO_MAX_PAGES
 in a bio

On 01/19/2011 04:34 AM, David Dillow wrote:
> On Tue, 2011-01-18 at 16:53 -0800, Andrew Morton wrote:
>>
>> Well.  -stable only needs the patch if the driver which triggers the
>> problem is also there.  But we don't know what driver that is, yet???
> 
> Good point.
> 
> Any driver that supports a sg_tablesize of more than 256 has the
> potential for problems. A quick search of the tree indicates that the
> following set their initial sg_tablesize to SCSI_MAX_SG_CHAIN_SEGMENTS
> (2048), though they may be saved by a separate bug I found -- and sent a
> patch to the list -- that incorrectly causes that define to take the
> value 128. 
> 
> ./drivers/usb/storage/scsiglue.c
> ./drivers/scsi/arm/powertec.c
> ./drivers/scsi/arm/eesox.c
> ./drivers/scsi/arm/cumana_2.c
> ./drivers/ata/pata_icside.c
> 
<snip>

iscsi has it on 2048 since ever

Boaz
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