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-rw-r--r--drivers/md/dm.c79
-rw-r--r--include/linux/device-mapper.h2
2 files changed, 81 insertions, 0 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index e38d1d7d17d6..96bd13e581cd 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1013,6 +1013,85 @@ void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors)
EXPORT_SYMBOL_GPL(dm_accept_partial_bio);
/*
+ * The zone descriptors obtained with a zone report indicate
+ * zone positions within the target device. The zone descriptors
+ * must be remapped to match their position within the dm device.
+ * A target may call dm_remap_zone_report after completion of a
+ * REQ_OP_ZONE_REPORT bio to remap the zone descriptors obtained
+ * from the target device mapping to the dm device.
+ */
+void dm_remap_zone_report(struct dm_target *ti, struct bio *bio, sector_t start)
+{
+#ifdef CONFIG_BLK_DEV_ZONED
+ struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
+ struct bio *report_bio = tio->io->bio;
+ struct blk_zone_report_hdr *hdr = NULL;
+ struct blk_zone *zone;
+ unsigned int nr_rep = 0;
+ unsigned int ofst;
+ struct bio_vec bvec;
+ struct bvec_iter iter;
+ void *addr;
+
+ if (bio->bi_status)
+ return;
+
+ /*
+ * Remap the start sector of the reported zones. For sequential zones,
+ * also remap the write pointer position.
+ */
+ bio_for_each_segment(bvec, report_bio, iter) {
+ addr = kmap_atomic(bvec.bv_page);
+
+ /* Remember the report header in the first page */
+ if (!hdr) {
+ hdr = addr;
+ ofst = sizeof(struct blk_zone_report_hdr);
+ } else
+ ofst = 0;
+
+ /* Set zones start sector */
+ while (hdr->nr_zones && ofst < bvec.bv_len) {
+ zone = addr + ofst;
+ if (zone->start >= start + ti->len) {
+ hdr->nr_zones = 0;
+ break;
+ }
+ zone->start = zone->start + ti->begin - start;
+ if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) {
+ if (zone->cond == BLK_ZONE_COND_FULL)
+ zone->wp = zone->start + zone->len;
+ else if (zone->cond == BLK_ZONE_COND_EMPTY)
+ zone->wp = zone->start;
+ else
+ zone->wp = zone->wp + ti->begin - start;
+ }
+ ofst += sizeof(struct blk_zone);
+ hdr->nr_zones--;
+ nr_rep++;
+ }
+
+ if (addr != hdr)
+ kunmap_atomic(addr);
+
+ if (!hdr->nr_zones)
+ break;
+ }
+
+ if (hdr) {
+ hdr->nr_zones = nr_rep;
+ kunmap_atomic(hdr);
+ }
+
+ bio_advance(report_bio, report_bio->bi_iter.bi_size);
+
+#else /* !CONFIG_BLK_DEV_ZONED */
+ bio->bi_status = BLK_STS_NOTSUPP;
+#endif
+}
+EXPORT_SYMBOL_GPL(dm_remap_zone_report);
+
+/*
* Flush current->bio_list when the target map method blocks.
* This fixes deadlocks in snapshot and possibly in other targets.
*/
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 186ef74009cb..0c1b50ad23b0 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -450,6 +450,8 @@ struct gendisk *dm_disk(struct mapped_device *md);
int dm_suspended(struct dm_target *ti);
int dm_noflush_suspending(struct dm_target *ti);
void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors);
+void dm_remap_zone_report(struct dm_target *ti, struct bio *bio,
+ sector_t start);
union map_info *dm_get_rq_mapinfo(struct request *rq);
struct queue_limits *dm_get_queue_limits(struct mapped_device *md);