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blk-mq: unshared timeout handler 

Duplicate the (small) timeout handler in blk-mq so that we can pass
arguments more easily to the driver timeout handler.  This enables
the next patch.

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 16:40:12 -07:00 committed by Jens Axboe
parent 81481eb423
commit 46f92d42ee
3 changed files with 38 additions and 23 deletions
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51
block/blk-mq.c
View File

@ -525,9 +525,15 @@ struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag)
}
EXPORT_SYMBOL(blk_mq_tag_to_rq);
static enum blk_eh_timer_return blk_mq_rq_timed_out(struct request *rq)
struct blk_mq_timeout_data {
unsigned long next;
unsigned int next_set;
};
static void blk_mq_rq_timed_out(struct request *req)
{
struct request_queue *q = rq->q;
struct blk_mq_ops *ops = req->q->mq_ops;
enum blk_eh_timer_return ret = BLK_EH_RESET_TIMER;
/*
* We know that complete is set at this point. If STARTED isn't set
@ -538,27 +544,43 @@ static enum blk_eh_timer_return blk_mq_rq_timed_out(struct request *rq)
* we both flags will get cleared. So check here again, and ignore
* a timeout event with a request that isn't active.
*/
if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
return BLK_EH_NOT_HANDLED;
if (!test_bit(REQ_ATOM_STARTED, &req->atomic_flags))
return;
if (!q->mq_ops->timeout)
return BLK_EH_RESET_TIMER;
if (ops->timeout)
ret = ops->timeout(req);
return q->mq_ops->timeout(rq);
switch (ret) {
case BLK_EH_HANDLED:
__blk_mq_complete_request(req);
break;
case BLK_EH_RESET_TIMER:
blk_add_timer(req);
blk_clear_rq_complete(req);
break;
case BLK_EH_NOT_HANDLED:
break;
default:
printk(KERN_ERR "block: bad eh return: %d\n", ret);
break;
}
}
struct blk_mq_timeout_data {
unsigned long next;
unsigned int next_set;
};
static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx,
struct request *rq, void *priv, bool reserved)
{
struct blk_mq_timeout_data *data = priv;
if (test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
blk_rq_check_expired(rq, &data->next, &data->next_set);
if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
return;
if (time_after_eq(jiffies, rq->deadline)) {
if (!blk_mark_rq_complete(rq))
blk_mq_rq_timed_out(rq);
} else if (!data->next_set || time_after(data->next, rq->deadline)) {
data->next = rq->deadline;
data->next_set = 1;
}
}
static void blk_mq_rq_timer(unsigned long priv)
@ -1781,7 +1803,6 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
else
blk_queue_make_request(q, blk_sq_make_request);
blk_queue_rq_timed_out(q, blk_mq_rq_timed_out);
if (set->timeout)
blk_queue_rq_timeout(q, set->timeout);

6
block/blk-timeout.c
View File

@ -7,7 +7,6 @@
#include <linux/fault-inject.h>
#include "blk.h"
#include "blk-mq.h"
#ifdef CONFIG_FAIL_IO_TIMEOUT
@ -90,9 +89,6 @@ static void blk_rq_timed_out(struct request *req)
switch (ret) {
case BLK_EH_HANDLED:
/* Can we use req->errors here? */
if (q->mq_ops)
__blk_mq_complete_request(req);
else
__blk_complete_request(req);
break;
case BLK_EH_RESET_TIMER:
@ -113,7 +109,7 @@ static void blk_rq_timed_out(struct request *req)
}
}
void blk_rq_check_expired(struct request *rq, unsigned long *next_timeout,
static void blk_rq_check_expired(struct request *rq, unsigned long *next_timeout,
unsigned int *next_set)
{
if (time_after_eq(jiffies, rq->deadline)) {

2
block/blk.h
View File

@ -38,8 +38,6 @@ bool __blk_end_bidi_request(struct request *rq, int error,
unsigned int nr_bytes, unsigned int bidi_bytes);
void blk_rq_timed_out_timer(unsigned long data);
void blk_rq_check_expired(struct request *rq, unsigned long *next_timeout,
unsigned int *next_set);
unsigned long blk_rq_timeout(unsigned long timeout);
void blk_add_timer(struct request *req);
void blk_delete_timer(struct request *);