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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 <[email protected]>
Reviewed-by: Omar Sandoval <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Bart Van Assche 2017-04-26 13:47:56 -07:00 • committed by Jens Axboe
commit 2836ee4b1a
2 changed files with 13 additions and 1 deletions
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6
block/blk-mq-debugfs.c
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@ -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;
}