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blk-mq: pass a reserved argument to the timeout handler 

Allow blk-mq to pass an argument to the timeout handler to indicate
if we're timing out a reserved or regular command.  For many drivers
those need to be handled different.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2014-09-13 16:40:13 -07:00 committed by Jens Axboe
parent 46f92d42ee
commit 0152fb6b57
3 changed files with 14 additions and 5 deletions
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6
block/blk-mq.c
View File

@ -530,7 +530,7 @@ struct blk_mq_timeout_data {
unsigned int next_set;
};
static void blk_mq_rq_timed_out(struct request *req)
static void blk_mq_rq_timed_out(struct request *req, bool reserved)
{
struct blk_mq_ops *ops = req->q->mq_ops;
enum blk_eh_timer_return ret = BLK_EH_RESET_TIMER;
@ -548,7 +548,7 @@ static void blk_mq_rq_timed_out(struct request *req)
return;
if (ops->timeout)
ret = ops->timeout(req);
ret = ops->timeout(req, reserved);
switch (ret) {
case BLK_EH_HANDLED:
@ -576,7 +576,7 @@ static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx,
if (time_after_eq(jiffies, rq->deadline)) {
if (!blk_mark_rq_complete(rq))
blk_mq_rq_timed_out(rq);
blk_mq_rq_timed_out(rq, reserved);
} else if (!data->next_set || time_after(data->next, rq->deadline)) {
data->next = rq->deadline;
data->next_set = 1;

10
drivers/scsi/scsi_lib.c
View File

@ -1932,6 +1932,14 @@ out:
return ret;
}
static enum blk_eh_timer_return scsi_timeout(struct request *req,
bool reserved)
{
if (reserved)
return BLK_EH_RESET_TIMER;
return scsi_times_out(req);
}
static int scsi_init_request(void *data, struct request *rq,
unsigned int hctx_idx, unsigned int request_idx,
unsigned int numa_node)
@ -2043,7 +2051,7 @@ static struct blk_mq_ops scsi_mq_ops = {
.map_queue = blk_mq_map_queue,
.queue_rq = scsi_queue_rq,
.complete = scsi_softirq_done,
.timeout = scsi_times_out,
.timeout = scsi_timeout,
.init_request = scsi_init_request,
.exit_request = scsi_exit_request,
};

3
include/linux/blk-mq.h
View File

@ -79,6 +79,7 @@ struct blk_mq_tag_set {
typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *, bool);
typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int);
typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
typedef int (init_request_fn)(void *, struct request *, unsigned int,
@ -103,7 +104,7 @@ struct blk_mq_ops {
/*
* Called on request timeout
*/
rq_timed_out_fn *timeout;
timeout_fn *timeout;
softirq_done_fn *complete;