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From: Jens Axboe on 28 Jun 2010 08:50
On 2010-06-28 14:37, Mike Snitzer wrote:
> On Mon, Jun 28 2010 at 8:34am -0400,
> Jens Axboe <axboe(a)kernel.dk> wrote:
>
>> On 2010-06-26 21:56, Mike Snitzer wrote:
>>> Don't alloc discard bio with a biovec in blkdev_issue_discard. Doing so
>>> means bio_has_data() will not be true until the SCSI layer adds the
>>> payload to the discard request via blk_add_request_payload.
>>
>> Sorry, this looks horrible.
>
> Your judgment isn't giving me much to work with... not sure where I go
> with "horrible".

The horrible part is working around that issue by fiddling with the
assignment of the internal vec. THAT looks like a horrible solution
to that problem.

How about just adding a check to bio_has_data() for non-zero
bio->bi_vcnt?

--
Jens Axboe

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Prev: acpi:glue.c Fix warning: variable 'ret' set but not used
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