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authorBart Van Assche <bart.vanassche@sandisk.com>2017-04-26 13:47:56 -0700
committerJens Axboe <axboe@fb.com>2017-04-26 15:09:04 -0600
commit2836ee4b1acbe7b396219d0677426885f14cd792 (patch)
tree823c705f789aaa2eb68d9c32913b686c55ea60a7
parent8658dca8bd5666f50e02400f844079e520641d8c (diff)
downloadlinux-2836ee4b1acbe7b396219d0677426885f14cd792.tar.bz2
blk-mq: Add blk_mq_ops.show_rq()
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>
-rw-r--r--block/blk-mq-debugfs.c6
-rw-r--r--include/linux/blk-mq.h8
2 files changed, 13 insertions, 1 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index ac39093c4ef7..bcd2a7d4a3a5 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -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;
}
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 0c4dadb85f62..32bd8eb5ba67 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -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 {