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bsg: move bsg-lib parts outside of request queue

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Get rid of the special bsg job fn and timeout handler, move them
into a private bsg_set instead.

Mostly from Christoph, with fixes for error handling and cleanups.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2018-10-29 09:47:17 -06:00
parent 4316b79e43
commit 1028e4b335
3 changed files with 31 additions and 22 deletions
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43
block/bsg-lib.c
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@@ -31,6 +31,12 @@
#define uptr64(val) ((void __user *)(uintptr_t)(val))
struct bsg_set {
struct blk_mq_tag_set tag_set;
bsg_job_fn *job_fn;
bsg_timeout_fn *timeout_fn;
};
static int bsg_transport_check_proto(struct sg_io_v4 *hdr)
{
if (hdr->protocol != BSG_PROTOCOL_SCSI ||
@@ -239,6 +245,8 @@ static blk_status_t bsg_queue_rq(struct blk_mq_hw_ctx *hctx,
struct request_queue *q = hctx->queue;
struct device *dev = q->queuedata;
struct request *req = bd->rq;
struct bsg_set *bset =
container_of(q->tag_set, struct bsg_set, tag_set);
int ret;
blk_mq_start_request(req);
@@ -249,7 +257,7 @@ static blk_status_t bsg_queue_rq(struct blk_mq_hw_ctx *hctx,
if (!bsg_prepare_job(dev, req))
return BLK_STS_IOERR;
ret = q->bsg_job_fn(blk_mq_rq_to_pdu(req));
ret = bset->job_fn(blk_mq_rq_to_pdu(req));
if (ret)
return BLK_STS_IOERR;
@@ -292,25 +300,25 @@ static void bsg_exit_rq(struct blk_mq_tag_set *set, struct request *req,
void bsg_remove_queue(struct request_queue *q)
{
if (q) {
struct blk_mq_tag_set *set = q->tag_set;
struct bsg_set *bset =
container_of(q->tag_set, struct bsg_set, tag_set);
bsg_unregister_queue(q);
blk_cleanup_queue(q);
blk_mq_free_tag_set(set);
kfree(set);
blk_mq_free_tag_set(&bset->tag_set);
kfree(bset);
}
}
EXPORT_SYMBOL_GPL(bsg_remove_queue);
static enum blk_eh_timer_return bsg_timeout(struct request *rq, bool reserved)
{
enum blk_eh_timer_return ret = BLK_EH_DONE;
struct request_queue *q = rq->q;
struct bsg_set *bset =
container_of(rq->q->tag_set, struct bsg_set, tag_set);
if (q->bsg_job_timeout_fn)
ret = q->bsg_job_timeout_fn(rq);
return ret;
if (!bset->timeout_fn)
return BLK_EH_DONE;
return bset->timeout_fn(rq);
}
static const struct blk_mq_ops bsg_mq_ops = {
@@ -330,16 +338,21 @@ static const struct blk_mq_ops bsg_mq_ops = {
* @dd_job_size: size of LLD data needed for each job
*/
struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
bsg_job_fn *job_fn, rq_timed_out_fn *timeout, int dd_job_size)
bsg_job_fn *job_fn, bsg_timeout_fn *timeout, int dd_job_size)
{
struct bsg_set *bset;
struct blk_mq_tag_set *set;
struct request_queue *q;
int ret = -ENOMEM;
set = kzalloc(sizeof(*set), GFP_KERNEL);
if (!set)
bset = kzalloc(sizeof(*bset), GFP_KERNEL);
if (!bset)
return ERR_PTR(-ENOMEM);
bset->job_fn = job_fn;
bset->timeout_fn = timeout;
set = &bset->tag_set;
set->ops = &bsg_mq_ops,
set->nr_hw_queues = 1;
set->queue_depth = 128;
@@ -356,8 +369,6 @@ struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
}
q->queuedata = dev;
q->bsg_job_fn = job_fn;
q->bsg_job_timeout_fn = timeout;
blk_queue_flag_set(QUEUE_FLAG_BIDI, q);
blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
@@ -374,7 +385,7 @@ out_cleanup_queue:
out_queue:
blk_mq_free_tag_set(set);
out_tag_set:
kfree(set);
kfree(bset);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(bsg_setup_queue);