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block: support different tag allocation policy

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The libata tag allocation is using a round-robin policy. Next patch will
make libata use block generic tag allocation, so let's add a policy to
tag allocation.

Currently two policies: FIFO (default) and round-robin.

Cc: Jens Axboe <axboe@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Shaohua Li
2015-01-15 17:32:25 -08:00
committed by Jens Axboe
parent bb5c3cdda3
commit ee1b6f7aff
6 changed files with 39 additions and 13 deletions
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3
drivers/scsi/scsi_scan.c
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@@ -290,7 +290,8 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
if (!shost_use_blk_mq(sdev->host) &&
(shost->bqt || shost->hostt->use_blk_tags)) {
blk_queue_init_tags(sdev->request_queue,
sdev->host->cmd_per_lun, shost->bqt);
sdev->host->cmd_per_lun, shost->bqt,
shost->hostt->tag_alloc_policy);
}
scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun);