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>

diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 7d42a9d9f406b713448e75822669cd4e23b1b966..c03c203a90b43a1972dfcf69870d0fbcbcbbd027 100644 (file)
--- 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,