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block: allow specifying size for extra command data

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This mirrors the blk-mq capabilities to allocate extra drivers-specific
data behind struct request by setting a cmd_size field, as well as having
a constructor / destructor for it.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2017-01-27 09:51:45 -07:00 • committed by Jens Axboe
commit 6d247d7f71
4 changed files with 61 additions and 17 deletions
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7
block/blk-sysfs.c
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@ -814,10 +814,13 @@ static void blk_release_queue(struct kobject *kobj)
if (q->queue_tags)
__blk_queue_free_tags(q);
if (!q->mq_ops)
if (!q->mq_ops) {
if (q->exit_rq_fn)
q->exit_rq_fn(q, q->fq->flush_rq);
blk_free_flush_queue(q->fq);
else
} else {
blk_mq_release(q);
}
blk_trace_shutdown(q);