[PATCH] dm-zoned: add 'status' and 'message' callbacks

[Hannes Reinecke <hare@suse.de>]

Add callbacks to supply information for 'dmsetup status'
and 'dmsetup info', and implement the message 'reclaim'
to start the reclaim worker.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/md/dm-zoned-metadata.c | 15 +++++++++++++++
 drivers/md/dm-zoned-target.c   | 43 ++++++++++++++++++++++++++++++++++++++++++
 drivers/md/dm-zoned.h          |  3 +++
 3 files changed, 61 insertions(+)

diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 516c7b671d25..6c456b9165db 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -202,6 +202,11 @@ sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone)
 	return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_blocks_shift;
 }
 
+unsigned int dmz_nr_zones(struct dmz_metadata *zmd)
+{
+	return zmd->dev->nr_zones;
+}
+
 unsigned int dmz_nr_chunks(struct dmz_metadata *zmd)
 {
 	return zmd->nr_chunks;
@@ -217,6 +222,16 @@ unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd)
 	return atomic_read(&zmd->unmap_nr_rnd);
 }
 
+unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd)
+{
+	return zmd->nr_seq;
+}
+
+unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd)
+{
+	return atomic_read(&zmd->unmap_nr_seq);
+}
+
 /*
  * Lock/unlock mapping table.
  * The map lock also protects all the zone lists.
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index f4f83d39b3dc..44e30a7de8b9 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -965,6 +965,47 @@ static int dmz_iterate_devices(struct dm_target *ti,
 	return fn(ti, dmz->ddev, 0, capacity, data);
 }
 
+static void dmz_status(struct dm_target *ti, status_type_t type,
+		       unsigned int status_flags, char *result,
+		       unsigned int maxlen)
+{
+	struct dmz_target *dmz = ti->private;
+	ssize_t sz = 0;
+	char buf[BDEVNAME_SIZE];
+
+	switch (type) {
+	case STATUSTYPE_INFO:
+		DMEMIT("%u zones "
+		       "%u/%u random "
+		       "%u/%u sequential",
+		       dmz_nr_zones(dmz->metadata),
+		       dmz_nr_unmap_rnd_zones(dmz->metadata),
+		       dmz_nr_rnd_zones(dmz->metadata),
+		       dmz_nr_unmap_seq_zones(dmz->metadata),
+		       dmz_nr_seq_zones(dmz->metadata));
+		break;
+	case STATUSTYPE_TABLE:
+		format_dev_t(buf, dmz->dev->bdev->bd_dev);
+		DMEMIT("%s ", buf);
+		break;
+	}
+	return;
+}
+
+static int dmz_message(struct dm_target *ti, unsigned int argc, char **argv,
+		       char *result, unsigned int maxlen)
+{
+	struct dmz_target *dmz = ti->private;
+	int r = -EINVAL;
+
+	if (!strcasecmp(argv[0], "reclaim")) {
+		dmz_schedule_reclaim(dmz->reclaim);
+		r = 0;
+	} else
+		DMERR("unrecognized message %s", argv[0]);
+	return r;
+}
+
 static struct target_type dmz_type = {
 	.name		 = "zoned",
 	.version	 = {1, 1, 0},
@@ -978,6 +1019,8 @@ static struct target_type dmz_type = {
 	.postsuspend	 = dmz_suspend,
 	.resume		 = dmz_resume,
 	.iterate_devices = dmz_iterate_devices,
+	.status		 = dmz_status,
+	.message	 = dmz_message,
 };
 
 static int __init dmz_init(void)
diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
index 5b5e493d479c..884c0e586082 100644
--- a/drivers/md/dm-zoned.h
+++ b/drivers/md/dm-zoned.h
@@ -190,8 +190,11 @@ void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
 void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *zone,
 		  unsigned int chunk);
 void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
+unsigned int dmz_nr_zones(struct dmz_metadata *zmd);
 unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd);
 unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd);
+unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd);
+unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd);
 
 /*
  * Activate a zone (increment its reference count).
-- 
2.16.4