Hi martin
On 03/02/2018 09:44 AM, Martin K. Petersen wrote:
>> In scsi core, __scsi_queue_insert should just put request back on the
>> queue and retry using the same command as before. However, for blk-mq,
>> scsi_mq_requeue_cmd is employed here which will unprepare the
>> request. To align with
Hi martin
On 03/02/2018 09:44 AM, Martin K. Petersen wrote:
>> In scsi core, __scsi_queue_insert should just put request back on the
>> queue and retry using the same command as before. However, for blk-mq,
>> scsi_mq_requeue_cmd is employed here which will unprepare the
>> request. To align with
Hi martin
Thanks for your kindly response.
On 03/02/2018 09:43 AM, Martin K. Petersen wrote:
>
> Jianchao,
>
>> Yes, the block layer core guarantees that scsi_mq_get_budget() will be
>> called before scsi_queue_rq(). I think the full picture is as follows:
>
>> * Before scsi_queue_rq() calls
Hi martin
Thanks for your kindly response.
On 03/02/2018 09:43 AM, Martin K. Petersen wrote:
>
> Jianchao,
>
>> Yes, the block layer core guarantees that scsi_mq_get_budget() will be
>> called before scsi_queue_rq(). I think the full picture is as follows:
>
>> * Before scsi_queue_rq() calls
Hi Bart
Thanks for your precious time and detailed summary.
On 03/02/2018 01:43 AM, Bart Van Assche wrote:
> Yes, the block layer core guarantees that scsi_mq_get_budget() will be called
> before scsi_queue_rq(). I think the full picture is as follows:
> * Before scsi_queue_rq() calls
Hi Bart
Thanks for your precious time and detailed summary.
On 03/02/2018 01:43 AM, Bart Van Assche wrote:
> Yes, the block layer core guarantees that scsi_mq_get_budget() will be called
> before scsi_queue_rq(). I think the full picture is as follows:
> * Before scsi_queue_rq() calls
Jianchao,
> Yes, the block layer core guarantees that scsi_mq_get_budget() will be
> called before scsi_queue_rq(). I think the full picture is as follows:
> * Before scsi_queue_rq() calls .queuecommand(), get_device() is called for the
> SCSI device and the device, target and host busy
Jianchao,
> Yes, the block layer core guarantees that scsi_mq_get_budget() will be
> called before scsi_queue_rq(). I think the full picture is as follows:
> * Before scsi_queue_rq() calls .queuecommand(), get_device() is called for the
> SCSI device and the device, target and host busy
Jianchao,
> In scsi core, __scsi_queue_insert should just put request back on the
> queue and retry using the same command as before. However, for blk-mq,
> scsi_mq_requeue_cmd is employed here which will unprepare the
> request. To align with the semantics of __scsi_queue_insert, use
>
Jianchao,
> In scsi core, __scsi_queue_insert should just put request back on the
> queue and retry using the same command as before. However, for blk-mq,
> scsi_mq_requeue_cmd is employed here which will unprepare the
> request. To align with the semantics of __scsi_queue_insert, use
>
On Thu, 2018-03-01 at 09:57 +0800, jianchao.wang wrote:
> On 03/01/2018 01:52 AM, Bart Van Assche wrote:
> > On Wed, 2018-02-28 at 16:55 +0800, Jianchao Wang wrote:
> > > diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> > > index a86df9c..6fa7b0c 100644
> > > ---
On Thu, 2018-03-01 at 09:57 +0800, jianchao.wang wrote:
> On 03/01/2018 01:52 AM, Bart Van Assche wrote:
> > On Wed, 2018-02-28 at 16:55 +0800, Jianchao Wang wrote:
> > > diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> > > index a86df9c..6fa7b0c 100644
> > > ---
Hi Bart
Thanks for your precious time to review this and kindly detailed response.
On 03/01/2018 01:52 AM, Bart Van Assche wrote:
> On Wed, 2018-02-28 at 16:55 +0800, Jianchao Wang wrote:
>> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
>> index a86df9c..6fa7b0c 100644
>> ---
Hi Bart
Thanks for your precious time to review this and kindly detailed response.
On 03/01/2018 01:52 AM, Bart Van Assche wrote:
> On Wed, 2018-02-28 at 16:55 +0800, Jianchao Wang wrote:
>> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
>> index a86df9c..6fa7b0c 100644
>> ---
On Wed, 2018-02-28 at 16:55 +0800, Jianchao Wang wrote:
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index a86df9c..6fa7b0c 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -191,7 +191,8 @@ static void __scsi_queue_insert(struct scsi_cmnd *cmd,
>
On Wed, 2018-02-28 at 16:55 +0800, Jianchao Wang wrote:
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index a86df9c..6fa7b0c 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -191,7 +191,8 @@ static void __scsi_queue_insert(struct scsi_cmnd *cmd,
>
In scsi core, __scsi_queue_insert should just put request back on
the queue and retry using the same command as before. However, for
blk-mq, scsi_mq_requeue_cmd is employed here which will unprepare
the request. To align with the semantics of __scsi_queue_insert,
use blk_mq_requeue_request with
In scsi core, __scsi_queue_insert should just put request back on
the queue and retry using the same command as before. However, for
blk-mq, scsi_mq_requeue_cmd is employed here which will unprepare
the request. To align with the semantics of __scsi_queue_insert,
use blk_mq_requeue_request with
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