linux-kernel - Re: [PATCH]:drivers/md/raid10.c: r10buf_pool_alloc(): Set bi

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Message-ID: <CAFR8uefeBTK8PaGO0h=-fbnjaxhUro7WS2WNVczdAfsqHFbBBw@mail.gmail.com>
Date:	Wed, 13 Jul 2011 21:40:17 -0700
From:	Muthu Kumar <muthu.lkml@...il.com>
To:	NeilBrown <neilb@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH]:drivers/md/raid10.c: r10buf_pool_alloc(): Set bi_vcnt for
 the new bio.

Hi Neil,

>>
>> BTW, why are we not using bio_add_page() here to add the page to bio?
>
> How would that be useful?  We don't know what the underlying device is at
> this point, and the point of bio_add_page is to make sure the device can
> handle the extra page.
>
> We do call bio_add_page at the appropriate time in sync_request().

Yes. Thanks for the explanation.

Regards,
Muthu

>
> So - not applied.
>
> Thanks,
> NeilBrown
>
>
>>
>> Signed-off-by: Muthukumar R <muthur@...il.com>
>>
>> ------
>>  drivers/md/raid10.c |    1 +
>>  1 files changed, 1 insertions(+), 0 deletions(-)
>> ------
>> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
>> index 6e84668..8504c5b 100644
>> --- a/drivers/md/raid10.c
>> +++ b/drivers/md/raid10.c
>> @@ -129,6 +129,7 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data)
>>
>>                         bio->bi_io_vec[i].bv_page = page;
>>                 }
>> +               bio->bi_vcnt = RESYNC_PAGES;
>>         }
>>
>>         return r10_bio;
>> --
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