dm linear: add support for zoned block devices

Add support for zoned block devices by allowing host-managed zoned block
device mapped targets, the remapping of REQ_OP_ZONE_RESET and the post
processing (reply remapping) of REQ_OP_ZONE_REPORT.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

1 files changed, 15 insertions, 3 deletions

diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 7d42a9d9f406..c03c203a90b4 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -89,7 +89,7 @@ static void linear_map_bio(struct dm_target *ti, struct bio *bio)
         struct linear_c *lc = ti->private;
 
         bio->bi_bdev = lc->dev->bdev;
-        if (bio_sectors(bio))
+        if (bio_sectors(bio) || bio_op(bio) == REQ_OP_ZONE_RESET)
                 bio->bi_iter.bi_sector =
                         linear_map_sector(ti, bio->bi_iter.bi_sector);
 }
@@ -101,6 +101,17 @@ static int linear_map(struct dm_target *ti, struct bio *bio)
         return DM_MAPIO_REMAPPED;
 }
 
+static int linear_end_io(struct dm_target *ti, struct bio *bio,
+                         blk_status_t *error)
+{
+        struct linear_c *lc = ti->private;
+
+        if (!*error && bio_op(bio) == REQ_OP_ZONE_REPORT)
+                dm_remap_zone_report(ti, bio, lc->start);
+
+        return DM_ENDIO_DONE;
+}
+
 static void linear_status(struct dm_target *ti, status_type_t type,
                           unsigned status_flags, char *result, unsigned maxlen)
 {
@@ -161,12 +172,13 @@ static long linear_dax_direct_access(struct dm_target *ti, pgoff_t pgoff,
 
 static struct target_type linear_target = {
         .name   = "linear",
-        .version = {1, 3, 0},
-        .features = DM_TARGET_PASSES_INTEGRITY,
+        .version = {1, 4, 0},
+        .features = DM_TARGET_PASSES_INTEGRITY | DM_TARGET_ZONED_HM,
         .module = THIS_MODULE,
         .ctr    = linear_ctr,
         .dtr    = linear_dtr,
         .map    = linear_map,
+        .end_io = linear_end_io,
         .status = linear_status,
         .prepare_ioctl = linear_prepare_ioctl,
         .iterate_devices = linear_iterate_devices,