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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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5
block/blk-flush.c
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@ -547,11 +547,10 @@ struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q,
if (!fq)
goto fail;
if (q->mq_ops) {
if (q->mq_ops)
spin_lock_init(&fq->mq_flush_lock);
rq_sz = round_up(rq_sz + cmd_size, cache_line_size());
}
rq_sz = round_up(rq_sz + cmd_size, cache_line_size());
fq->flush_rq = kzalloc_node(rq_sz, GFP_KERNEL, node);
if (!fq->flush_rq)
goto fail_rq;