From: Hannes Reinecke <hare@suse.de>
Date: Thu, 7 Jun 2018 08:38:47 +0000 (+0200)
Subject: nvme: add bio remapping tracepoint
X-Git-Tag: v4.18-rc1~1^2~2^2~11
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2796b569591c6f0681303f148a55e50c2cc8304a;p=thirdparty%2Fkernel%2Flinux.git

nvme: add bio remapping tracepoint

Adding a tracepoint to trace bio remapping for native nvme multipath.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index d7b664ae5923e..1ffd3e8b13a18 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -12,6 +12,7 @@
  */
 
 #include <linux/moduleparam.h>
+#include <trace/events/block.h>
 #include "nvme.h"
 
 static bool multipath = true;
@@ -111,6 +112,9 @@ static blk_qc_t nvme_ns_head_make_request(struct request_queue *q,
 	if (likely(ns)) {
 		bio->bi_disk = ns->disk;
 		bio->bi_opf |= REQ_NVME_MPATH;
+		trace_block_bio_remap(bio->bi_disk->queue, bio,
+				      disk_devt(ns->head->disk),
+				      bio->bi_iter.bi_sector);
 		ret = direct_make_request(bio);
 	} else if (!list_empty_careful(&head->list)) {
 		dev_warn_ratelimited(dev, "no path available - requeuing I/O\n");