linux-kernel - Re: [PATCH v3 03/16] block: Add bio

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Date:	Mon, 28 May 2012 13:02:45 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Kent Overstreet <koverstreet@...gle.com>,
	<linux-kernel@...r.kernel.org>, <linux-bcache@...r.kernel.org>,
	<dm-devel@...hat.com>, <linux-fsdevel@...r.kernel.org>,
	<axboe@...nel.dk>, <agk@...hat.com>, <neilb@...e.de>,
	<drbd-dev@...ts.linbit.com>, <vgoyal@...hat.com>,
	<mpatocka@...hat.com>, <sage@...dream.net>,
	<yehuda@...newdream.net>
Subject: Re: [PATCH v3 03/16] block: Add bio_reset()

On 05/28/2012 04:23 AM, Tejun Heo wrote:

> On Fri, May 25, 2012 at 01:25:26PM -0700, Kent Overstreet wrote:
>> Reusing bios is something that's been highly frowned upon in the past,
>> but driver code keeps doing it anyways. If it's going to happen anyways,
>> we should provide a generic method.
>>
>> This'll help with getting rid of bi_destructor - drivers/block/pktcdvd.c
>> was open coding it, by doing a bio_init() and resetting bi_destructor.
>>
>> Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
>> Change-Id: Ib0a43dfcb3f6c22a54da513d4a86be544b5ffd95
>> ---
>>  fs/bio.c                  |    8 ++++++++
>>  include/linux/bio.h       |    1 +
>>  include/linux/blk_types.h |    6 ++++++
>>  3 files changed, 15 insertions(+)
>>
>> diff --git a/fs/bio.c b/fs/bio.c
>> index 3667cef..240da21 100644
>> --- a/fs/bio.c
>> +++ b/fs/bio.c
>> @@ -259,6 +259,14 @@ void bio_init(struct bio *bio)
>>  }
>>  EXPORT_SYMBOL(bio_init);
>>  
> 
> Function comment please.


And please make this inline in header. We should not 
EXPORT_SYMBOL a memset. (Even the memset gets inlined by
compiler.

Boaz

> 
>> +void bio_reset(struct bio *bio)
>> +{
>> +	memset(bio, 0, BIO_RESET_BYTES);
>> +	bio->bi_flags = 1 << BIO_UPTODATE;
>> +
>> +}
>> +EXPORT_SYMBOL(bio_reset);
> 


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