linux-kernel - Re: [PATCH v6 6/6] loop: Add support for REQ

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Date:   Wed, 12 Feb 2020 20:34:52 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     martin.petersen@...cle.com, bob.liu@...cle.com, axboe@...nel.dk,
        agk@...hat.com, snitzer@...hat.com, dm-devel@...hat.com,
        song@...nel.org, tytso@....edu, adilger.kernel@...ger.ca,
        Chaitanya.Kulkarni@....com, ming.lei@...hat.com, osandov@...com,
        jthumshirn@...e.de, minwoo.im.dev@...il.com, damien.lemoal@....com,
        andrea.parri@...rulasolutions.com, hare@...e.com, tj@...nel.org,
        ajay.joshi@....com, sagi@...mberg.me, dsterba@...e.com,
        bvanassche@....org, dhowells@...hat.com, asml.silence@...il.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 6/6] loop: Add support for REQ_ALLOCATE

On 12.02.2020 20:01, Darrick J. Wong wrote:
> On Mon, Feb 10, 2020 at 12:34:04PM +0300, Kirill Tkhai wrote:
>> Support for new modifier of REQ_OP_WRITE_ZEROES command.
>> This results in allocation extents in backing file instead
>> of actual blocks zeroing.
>>
>> Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
>> Reviewed-by: Bob Liu <bob.liu@...cle.com>
>> ---
>>  drivers/block/loop.c |   15 ++++++++++++---
>>  1 file changed, 12 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/block/loop.c b/drivers/block/loop.c
>> index 739b372a5112..bfe76d9adf09 100644
>> --- a/drivers/block/loop.c
>> +++ b/drivers/block/loop.c
>> @@ -581,6 +581,15 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
>>  	return 0;
>>  }
>>  
>> +static unsigned int write_zeroes_to_fallocate_mode(unsigned int flags)
>> +{
>> +	if (flags & REQ_ALLOCATE)
>> +		return 0;
>> +	if (flags & REQ_NOUNMAP)
>> +		return FALLOC_FL_ZERO_RANGE;
>> +	return FALLOC_FL_PUNCH_HOLE;
>> +}
>> +
>>  static int do_req_filebacked(struct loop_device *lo, struct request *rq)
>>  {
>>  	struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);
>> @@ -604,9 +613,7 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq)
>>  		 * write zeroes the range.  Otherwise, punch them out.
>>  		 */
> 
> Please update this comment to reflect the new REQ_ALLOCATE mode, and
> move it to where you define write_zeroes_to_fallocate_mode().

Ok, I'll update it in v7

> With that fixed,
> 
> Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

Thanks