diff mbox series

[v6,6/6] loop: Add support for REQ_ALLOCATE

Message ID 158132724397.239613.16927024926439560344.stgit@localhost.localdomain (mailing list archive)
State Not Applicable, archived
Delegated to: Mike Snitzer
Headers show
Series block: Introduce REQ_ALLOCATE flag for REQ_OP_WRITE_ZEROES | expand

Commit Message

Kirill Tkhai Feb. 10, 2020, 9:34 a.m. UTC 
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@virtuozzo.com>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
---
 drivers/block/loop.c |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)




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Comments

Darrick J. Wong Feb. 12, 2020, 5:01 p.m. UTC | #1 
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@virtuozzo.com>
> Reviewed-by: Bob Liu <bob.liu@oracle.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().

With that fixed,

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

>  		return lo_fallocate(lo, rq, pos,
> -			(rq->cmd_flags & REQ_NOUNMAP) ?
> -				FALLOC_FL_ZERO_RANGE :
> -				FALLOC_FL_PUNCH_HOLE);
> +			write_zeroes_to_fallocate_mode(rq->cmd_flags));
>  	case REQ_OP_DISCARD:
>  		return lo_fallocate(lo, rq, pos, FALLOC_FL_PUNCH_HOLE);
>  	case REQ_OP_WRITE:
> @@ -877,6 +884,7 @@ static void loop_config_discard(struct loop_device *lo)
>  		q->limits.discard_alignment = 0;
>  		blk_queue_max_discard_sectors(q, 0);
>  		blk_queue_max_write_zeroes_sectors(q, 0);
> +		blk_queue_max_allocate_sectors(q, 0);
>  		blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
>  		return;
>  	}
> @@ -886,6 +894,7 @@ static void loop_config_discard(struct loop_device *lo)
>  
>  	blk_queue_max_discard_sectors(q, UINT_MAX >> 9);
>  	blk_queue_max_write_zeroes_sectors(q, UINT_MAX >> 9);
> +	blk_queue_max_allocate_sectors(q, UINT_MAX >> 9);
>  	blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
>  }
>  
> 
> 


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Kirill Tkhai Feb. 12, 2020, 5:34 p.m. UTC | #2 
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@virtuozzo.com>
>> Reviewed-by: Bob Liu <bob.liu@oracle.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@oracle.com>

Thanks


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Kirill Tkhai Feb. 12, 2020, 8 p.m. UTC | #3 
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@virtuozzo.com>
>> Reviewed-by: Bob Liu <bob.liu@oracle.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().
> 
> With that fixed,
> 
> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

Just to clarify. Is this "Reviewed-by:" tag for this patch or for the whole series?

Kirill


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Darrick J. Wong Feb. 12, 2020, 8:44 p.m. UTC | #4 
On Wed, Feb 12, 2020 at 11:00:15PM +0300, Kirill Tkhai wrote:
> 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@virtuozzo.com>
> >> Reviewed-by: Bob Liu <bob.liu@oracle.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().
> > 
> > With that fixed,
> > 
> > Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
> 
> Just to clarify. Is this "Reviewed-by:" tag for this patch or for the whole series?

Only that patch.

--D

> Kirill


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diff mbox series

Patch

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.
 		 */
 		return lo_fallocate(lo, rq, pos,
-			(rq->cmd_flags & REQ_NOUNMAP) ?
-				FALLOC_FL_ZERO_RANGE :
-				FALLOC_FL_PUNCH_HOLE);
+			write_zeroes_to_fallocate_mode(rq->cmd_flags));
 	case REQ_OP_DISCARD:
 		return lo_fallocate(lo, rq, pos, FALLOC_FL_PUNCH_HOLE);
 	case REQ_OP_WRITE:
@@ -877,6 +884,7 @@  static void loop_config_discard(struct loop_device *lo)
 		q->limits.discard_alignment = 0;
 		blk_queue_max_discard_sectors(q, 0);
 		blk_queue_max_write_zeroes_sectors(q, 0);
+		blk_queue_max_allocate_sectors(q, 0);
 		blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 		return;
 	}
@@ -886,6 +894,7 @@  static void loop_config_discard(struct loop_device *lo)
 
 	blk_queue_max_discard_sectors(q, UINT_MAX >> 9);
 	blk_queue_max_write_zeroes_sectors(q, UINT_MAX >> 9);
+	blk_queue_max_allocate_sectors(q, UINT_MAX >> 9);
 	blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 }