[PATCH v3 4/5] block: add tracepoint for blkdev_zone_mgmt

[Johannes Thumshirn <johannes.thumshirn@xxxxxxx>]

Add a tracepoint for blkdev_zone_mgmt to trace zone management commands
submitted by higher layers like file systems or user space.

An example output for this tracepoint is as follows:

  mkfs.btrfs-203  [001] .....  42.877493: blkdev_zone_mgmt: 8,0 ZRS 5242880 + 0

This example output shows a REQ_OP_ZONE_RESET operation submitted by
mkfs.btrfs.

Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx>
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
---
 block/blk-zoned.c            |  2 ++
 include/trace/events/block.h | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 2584ffb6b022..48f75f58d05e 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -179,6 +179,7 @@ static int blkdev_zone_reset_all(struct block_device *bdev)
 	struct bio bio;
 
 	bio_init(&bio, bdev, NULL, 0, REQ_OP_ZONE_RESET_ALL | REQ_SYNC);
+	trace_blkdev_zone_mgmt(&bio, 0);
 	return submit_bio_wait(&bio);
 }
 
@@ -242,6 +243,7 @@ int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
 		cond_resched();
 	}
 
+	trace_blkdev_zone_mgmt(bio, nr_sectors);
 	ret = submit_bio_wait(bio);
 	bio_put(bio);
 
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index 4855abdf9880..ff7698efdfde 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -599,6 +599,40 @@ TRACE_EVENT(block_rq_remap,
 		  (unsigned long long)__entry->old_sector, __entry->nr_bios)
 );
 
+/**
+ * blkdev_zone_mgmt - Execute a zone management operation on a range of zones
+ * @bio: The block IO operation sent down to the device
+ * @nr_sectors: The number of sectors affected by this operation
+ *
+ * Execute a zone management operation on a specified range of zones. This
+ * range is encoded in %nr_sectors, which has to be a multiple of the zone
+ * size.
+ */
+TRACE_EVENT(blkdev_zone_mgmt,
+
+	TP_PROTO(struct bio *bio, sector_t nr_sectors),
+
+	TP_ARGS(bio, nr_sectors),
+
+	TP_STRUCT__entry(
+	    __field(  dev_t,	dev		)
+	    __field(  sector_t,	sector		)
+	    __field(  sector_t, nr_sectors	)
+	    __array(  char,	rwbs,	RWBS_LEN)
+	),
+
+	TP_fast_assign(
+	    __entry->dev	= bio_dev(bio);
+	    __entry->sector	= bio->bi_iter.bi_sector;
+	    __entry->nr_sectors	= bio_sectors(bio);
+	    blk_fill_rwbs(__entry->rwbs, bio->bi_opf);
+        ),
+
+	TP_printk("%d,%d %s %llu + %llu",
+		  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->rwbs,
+		  (unsigned long long)__entry->sector,
+		  __entry->nr_sectors)
+);
 #endif /* _TRACE_BLOCK_H */
 
 /* This part must be outside protection */
-- 
2.50.0