[PATCH 24/30] bsg: move bsg-lib parts outside of request queue

Jens Axboe
2018-10-31T17:59:16Z

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>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/bsg-lib.c | 43 ++++++++++++++++++++++++++---------------
include/linux/blkdev.h | 5 -----
include/linux/bsg-lib.h | 5 ++++-
3 files changed, 31 insertions(+), 22 deletions(-)

diff --git a/block/bsg-lib.c b/block/bsg-lib.c
index f38c7bc272c0..192129856342 100644
--- a/block/bsg-lib.c
+++ b/block/bsg-lib.c
@@ -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;
-
- if (q->bsg_job_timeout_fn)
- ret = q->bsg_job_timeout_fn(rq);
+ struct bsg_set *bset =
+ container_of(rq->q->tag_set, struct bsg_set, tag_set);

- 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 @@ struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
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);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0364fc53f5c8..877a3d235c45 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -312,7 +312,6 @@ typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t);
struct bio_vec;
typedef void (softirq_done_fn)(struct request *);
typedef int (dma_drain_needed_fn)(struct request *);
-typedef int (bsg_job_fn) (struct bsg_job *);
typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t);
typedef void (exit_rq_fn)(struct request_queue *, struct request *);

@@ -321,8 +320,6 @@ enum blk_eh_timer_return {
BLK_EH_RESET_TIMER, /* reset timer and try again */
};

-typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
-
enum blk_queue_state {
Queue_down,
Queue_up,
@@ -598,8 +595,6 @@ struct request_queue {
atomic_t mq_freeze_depth;

#if defined(CONFIG_BLK_DEV_BSG)
- bsg_job_fn *bsg_job_fn;
- rq_timed_out_fn *bsg_job_timeout_fn;
struct bsg_class_device bsg_dev;
#endif

diff --git a/include/linux/bsg-lib.h b/include/linux/bsg-lib.h
index 9c9b134b1fa5..b356e0006731 100644
--- a/include/linux/bsg-lib.h
+++ b/include/linux/bsg-lib.h
@@ -31,6 +31,9 @@ struct device;
struct scatterlist;
struct request_queue;

+typedef int (bsg_job_fn) (struct bsg_job *);
+typedef enum blk_eh_timer_return (bsg_timeout_fn)(struct request *);
+
struct bsg_buffer {
unsigned int payload_len;
int sg_cnt;
@@ -72,7 +75,7 @@ struct bsg_job {
void bsg_job_done(struct bsg_job *job, int result,
unsigned int reply_payload_rcv_len);
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);
void bsg_remove_queue(struct request_queue *q);
void bsg_job_put(struct bsg_job *job);
int __must_check bsg_job_get(struct bsg_job *job);
--
2.17.1