blk-mq: initialize request on allocation
If we want to share tag and request allocation between queues we cannot
initialize the request at init/free time, but need to initialize it
at allocation time as it might get used for different queues over its
lifetime.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 48d2d84..2a5a0fe 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -82,6 +82,7 @@
tag = blk_mq_get_tag(hctx->tags, gfp, reserved);
if (tag != BLK_MQ_TAG_FAIL) {
rq = hctx->rqs[tag];
+ blk_rq_init(hctx->queue, rq);
rq->tag = tag;
return rq;
@@ -257,9 +258,7 @@
const int tag = rq->tag;
struct request_queue *q = rq->q;
- blk_rq_init(hctx->queue, rq);
blk_mq_put_tag(hctx->tags, tag);
-
blk_mq_queue_exit(q);
}
@@ -1122,7 +1121,6 @@
left -= to_do * rq_size;
for (j = 0; j < to_do; j++) {
hctx->rqs[i] = p;
- blk_rq_init(hctx->queue, hctx->rqs[i]);
if (reg->ops->init_request) {
error = reg->ops->init_request(driver_data,
hctx, hctx->rqs[i], i);