[PATCH v4 10/10] scsi: Implement blk_mq_ops.show_rq()

Bart Van Assche
2017-04-21T23:40:26Z

Show the SCSI CDB, .eh_eflags and .result for pending SCSI commands
in /sys/kernel/debug/block/*/mq/*/dispatch and */rq_list.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: <linux-scsi@vger.kernel.org>
---
drivers/scsi/scsi_lib.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 4a20e6098f7c..90bb269042df 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2125,6 +2125,16 @@ static void scsi_exit_rq(struct request_queue *q, struct request *rq)
scsi_free_sense_buffer(shost, cmd->sense_buffer);
}

+static void scsi_show_rq(struct seq_file *m, struct request *rq)
+{
+ struct scsi_cmnd *cmd = container_of(scsi_req(rq), typeof(*cmd), req);
+ unsigned int i;
+
+ seq_puts(m, ", .cmd =");
+ for (i = 0; i < cmd->cmd_len; i++)
+ seq_printf(m, " %02x", cmd->cmnd[i]);
+}
+
struct request_queue *scsi_alloc_queue(struct scsi_device *sdev)
{
struct Scsi_Host *shost = sdev->host;
@@ -2157,6 +2167,7 @@ static const struct blk_mq_ops scsi_mq_ops = {
.queue_rq = scsi_queue_rq,
.complete = scsi_softirq_done,
.timeout = scsi_timeout,
+ .show_rq = scsi_show_rq,
.init_request = scsi_init_request,
.exit_request = scsi_exit_request,
.map_queues = scsi_map_queues,
--
2.12.2