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block: add a rq_list type

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Replace the semi-open coded request list helpers with a proper rq_list
type that mirrors the bio_list and has head and tail pointers.  Besides
better type safety this actually allows to insert at the tail of the
list, which will be useful soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241113152050.157179-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2024-11-13 16:20:44 +01:00
committed by Jens Axboe
parent e8225ab150
commit a3396b9999
11 changed files with 102 additions and 86 deletions
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9
drivers/block/null_blk/main.c
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@@ -1638,10 +1638,9 @@ static blk_status_t null_queue_rq(struct blk_mq_hw_ctx *hctx,
return BLK_STS_OK;
}
static void null_queue_rqs(struct request **rqlist)
static void null_queue_rqs(struct rq_list *rqlist)
{
struct request *requeue_list = NULL;
struct request **requeue_lastp = &requeue_list;
struct rq_list requeue_list = {};
struct blk_mq_queue_data bd = { };
blk_status_t ret;
@@ -1651,8 +1650,8 @@ static void null_queue_rqs(struct request **rqlist)
bd.rq = rq;
ret = null_queue_rq(rq->mq_hctx, &bd);
if (ret != BLK_STS_OK)
rq_list_add_tail(&requeue_lastp, rq);
} while (!rq_list_empty(*rqlist));
rq_list_add_tail(&requeue_list, rq);
} while (!rq_list_empty(rqlist));
*rqlist = requeue_list;
}