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blk-mq: Add blk_mq_ops.show_rq()

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This new callback function will be used in the next patch to show
more information about SCSI requests.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Cc: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Bart Van Assche 2017-04-26 13:47:56 -07:00 committed by Jens Axboe
parent 8658dca8bd
commit 2836ee4b1a
2 changed files with 13 additions and 1 deletions
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6
block/blk-mq-debugfs.c
View File

@ -311,6 +311,7 @@ static const char *const rqf_name[] = {
static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
{
struct request *rq = list_entry_rq(v);
const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
const unsigned int op = rq->cmd_flags & REQ_OP_MASK;
seq_printf(m, "%p {.op=", rq);
@ -324,8 +325,11 @@ static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
seq_puts(m, ", .rq_flags=");
blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
ARRAY_SIZE(rqf_name));
seq_printf(m, ", .tag=%d, .internal_tag=%d}\n", rq->tag,
seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
rq->internal_tag);
if (mq_ops->show_rq)
mq_ops->show_rq(m, rq);
seq_puts(m, "}\n");
return 0;
}

8
include/linux/blk-mq.h
View File

@ -142,6 +142,14 @@ struct blk_mq_ops {
reinit_request_fn *reinit_request;
map_queues_fn *map_queues;
#ifdef CONFIG_BLK_DEBUG_FS
/*
* Used by the debugfs implementation to show driver-specific
* information about a request.
*/
void (*show_rq)(struct seq_file *m, struct request *rq);
#endif
};
enum {