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block: Introduce queue flag QUEUE_FLAG_SCSI_PASSTHROUGH

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From the context where a SCSI command is submitted it is not always
possible to figure out whether or not the queue the command is
submitted to has struct scsi_request as the first member of its
private data. Hence introduce the flag QUEUE_FLAG_SCSI_PASSTHROUGH.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Don Brace <don.brace@microsemi.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Bart Van Assche
2017-05-31 14:43:46 -07:00
committed by Jens Axboe
parent edea55abb8
commit 9efc160f4b
6 changed files with 9 additions and 0 deletions
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2
drivers/scsi/scsi_lib.c
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@@ -2057,6 +2057,8 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
{
struct device *dev = shost->dma_dev;
queue_flag_set_unlocked(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
/*
* this limit is imposed by hardware restrictions
*/