2 * Copyright (C) 2017 Western Digital Corporation or its affiliates.
4 * This file is released under the GPL.
9 #include <linux/module.h>
11 #define DM_MSG_PREFIX "zoned"
13 #define DMZ_MIN_BIOS 8192
19 struct dmz_target *target;
27 * Chunk work descriptor.
29 struct dm_chunk_work {
30 struct work_struct work;
32 struct dmz_target *target;
34 struct bio_list bio_list;
45 /* Zoned block device information */
48 /* For metadata handling */
49 struct dmz_metadata *metadata;
52 struct dmz_reclaim *reclaim;
55 struct mutex chunk_lock;
56 struct radix_tree_root chunk_rxtree;
57 struct workqueue_struct *chunk_wq;
59 /* For cloned BIOs to zones */
60 struct bio_set *bio_set;
63 spinlock_t flush_lock;
64 struct bio_list flush_list;
65 struct delayed_work flush_work;
66 struct workqueue_struct *flush_wq;
70 * Flush intervals (seconds).
72 #define DMZ_FLUSH_PERIOD (10 * HZ)
75 * Target BIO completion.
77 static inline void dmz_bio_endio(struct bio *bio, blk_status_t status)
79 struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
81 if (bioctx->status == BLK_STS_OK && status != BLK_STS_OK)
82 bioctx->status = status;
87 * Partial clone read BIO completion callback. This terminates the
88 * target BIO when there are no more references to its context.
90 static void dmz_read_bio_end_io(struct bio *bio)
92 struct dmz_bioctx *bioctx = bio->bi_private;
93 blk_status_t status = bio->bi_status;
96 dmz_bio_endio(bioctx->bio, status);
100 * Issue a BIO to a zone. The BIO may only partially process the
101 * original target BIO.
103 static int dmz_submit_read_bio(struct dmz_target *dmz, struct dm_zone *zone,
104 struct bio *bio, sector_t chunk_block,
105 unsigned int nr_blocks)
107 struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
111 /* BIO remap sector */
112 sector = dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block);
114 /* If the read is not partial, there is no need to clone the BIO */
115 if (nr_blocks == dmz_bio_blocks(bio)) {
116 /* Setup and submit the BIO */
117 bio->bi_iter.bi_sector = sector;
118 atomic_inc(&bioctx->ref);
119 generic_make_request(bio);
123 /* Partial BIO: we need to clone the BIO */
124 clone = bio_clone_fast(bio, GFP_NOIO, dmz->bio_set);
128 /* Setup the clone */
129 clone->bi_iter.bi_sector = sector;
130 clone->bi_iter.bi_size = dmz_blk2sect(nr_blocks) << SECTOR_SHIFT;
131 clone->bi_end_io = dmz_read_bio_end_io;
132 clone->bi_private = bioctx;
134 bio_advance(bio, clone->bi_iter.bi_size);
136 /* Submit the clone */
137 atomic_inc(&bioctx->ref);
138 generic_make_request(clone);
144 * Zero out pages of discarded blocks accessed by a read BIO.
146 static void dmz_handle_read_zero(struct dmz_target *dmz, struct bio *bio,
147 sector_t chunk_block, unsigned int nr_blocks)
149 unsigned int size = nr_blocks << DMZ_BLOCK_SHIFT;
151 /* Clear nr_blocks */
152 swap(bio->bi_iter.bi_size, size);
154 swap(bio->bi_iter.bi_size, size);
156 bio_advance(bio, size);
160 * Process a read BIO.
162 static int dmz_handle_read(struct dmz_target *dmz, struct dm_zone *zone,
165 sector_t chunk_block = dmz_chunk_block(dmz->dev, dmz_bio_block(bio));
166 unsigned int nr_blocks = dmz_bio_blocks(bio);
167 sector_t end_block = chunk_block + nr_blocks;
168 struct dm_zone *rzone, *bzone;
171 /* Read into unmapped chunks need only zeroing the BIO buffer */
177 dmz_dev_debug(dmz->dev, "READ chunk %llu -> %s zone %u, block %llu, %u blocks",
178 (unsigned long long)dmz_bio_chunk(dmz->dev, bio),
179 (dmz_is_rnd(zone) ? "RND" : "SEQ"),
180 dmz_id(dmz->metadata, zone),
181 (unsigned long long)chunk_block, nr_blocks);
183 /* Check block validity to determine the read location */
185 while (chunk_block < end_block) {
187 if (dmz_is_rnd(zone) || chunk_block < zone->wp_block) {
188 /* Test block validity in the data zone */
189 ret = dmz_block_valid(dmz->metadata, zone, chunk_block);
193 /* Read data zone blocks */
200 * No valid blocks found in the data zone.
201 * Check the buffer zone, if there is one.
203 if (!nr_blocks && bzone) {
204 ret = dmz_block_valid(dmz->metadata, bzone, chunk_block);
208 /* Read buffer zone blocks */
215 /* Valid blocks found: read them */
216 nr_blocks = min_t(unsigned int, nr_blocks, end_block - chunk_block);
217 ret = dmz_submit_read_bio(dmz, rzone, bio, chunk_block, nr_blocks);
220 chunk_block += nr_blocks;
222 /* No valid block: zeroout the current BIO block */
223 dmz_handle_read_zero(dmz, bio, chunk_block, 1);
232 * Issue a write BIO to a zone.
234 static void dmz_submit_write_bio(struct dmz_target *dmz, struct dm_zone *zone,
235 struct bio *bio, sector_t chunk_block,
236 unsigned int nr_blocks)
238 struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
240 /* Setup and submit the BIO */
241 bio_set_dev(bio, dmz->dev->bdev);
242 bio->bi_iter.bi_sector = dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block);
243 atomic_inc(&bioctx->ref);
244 generic_make_request(bio);
246 if (dmz_is_seq(zone))
247 zone->wp_block += nr_blocks;
251 * Write blocks directly in a data zone, at the write pointer.
252 * If a buffer zone is assigned, invalidate the blocks written
255 static int dmz_handle_direct_write(struct dmz_target *dmz,
256 struct dm_zone *zone, struct bio *bio,
257 sector_t chunk_block,
258 unsigned int nr_blocks)
260 struct dmz_metadata *zmd = dmz->metadata;
261 struct dm_zone *bzone = zone->bzone;
264 if (dmz_is_readonly(zone))
268 dmz_submit_write_bio(dmz, zone, bio, chunk_block, nr_blocks);
271 * Validate the blocks in the data zone and invalidate
272 * in the buffer zone, if there is one.
274 ret = dmz_validate_blocks(zmd, zone, chunk_block, nr_blocks);
275 if (ret == 0 && bzone)
276 ret = dmz_invalidate_blocks(zmd, bzone, chunk_block, nr_blocks);
282 * Write blocks in the buffer zone of @zone.
283 * If no buffer zone is assigned yet, get one.
284 * Called with @zone write locked.
286 static int dmz_handle_buffered_write(struct dmz_target *dmz,
287 struct dm_zone *zone, struct bio *bio,
288 sector_t chunk_block,
289 unsigned int nr_blocks)
291 struct dmz_metadata *zmd = dmz->metadata;
292 struct dm_zone *bzone;
295 /* Get the buffer zone. One will be allocated if needed */
296 bzone = dmz_get_chunk_buffer(zmd, zone);
300 if (dmz_is_readonly(bzone))
304 dmz_submit_write_bio(dmz, bzone, bio, chunk_block, nr_blocks);
307 * Validate the blocks in the buffer zone
308 * and invalidate in the data zone.
310 ret = dmz_validate_blocks(zmd, bzone, chunk_block, nr_blocks);
311 if (ret == 0 && chunk_block < zone->wp_block)
312 ret = dmz_invalidate_blocks(zmd, zone, chunk_block, nr_blocks);
318 * Process a write BIO.
320 static int dmz_handle_write(struct dmz_target *dmz, struct dm_zone *zone,
323 sector_t chunk_block = dmz_chunk_block(dmz->dev, dmz_bio_block(bio));
324 unsigned int nr_blocks = dmz_bio_blocks(bio);
329 dmz_dev_debug(dmz->dev, "WRITE chunk %llu -> %s zone %u, block %llu, %u blocks",
330 (unsigned long long)dmz_bio_chunk(dmz->dev, bio),
331 (dmz_is_rnd(zone) ? "RND" : "SEQ"),
332 dmz_id(dmz->metadata, zone),
333 (unsigned long long)chunk_block, nr_blocks);
335 if (dmz_is_rnd(zone) || chunk_block == zone->wp_block) {
337 * zone is a random zone or it is a sequential zone
338 * and the BIO is aligned to the zone write pointer:
339 * direct write the zone.
341 return dmz_handle_direct_write(dmz, zone, bio, chunk_block, nr_blocks);
345 * This is an unaligned write in a sequential zone:
346 * use buffered write.
348 return dmz_handle_buffered_write(dmz, zone, bio, chunk_block, nr_blocks);
352 * Process a discard BIO.
354 static int dmz_handle_discard(struct dmz_target *dmz, struct dm_zone *zone,
357 struct dmz_metadata *zmd = dmz->metadata;
358 sector_t block = dmz_bio_block(bio);
359 unsigned int nr_blocks = dmz_bio_blocks(bio);
360 sector_t chunk_block = dmz_chunk_block(dmz->dev, block);
363 /* For unmapped chunks, there is nothing to do */
367 if (dmz_is_readonly(zone))
370 dmz_dev_debug(dmz->dev, "DISCARD chunk %llu -> zone %u, block %llu, %u blocks",
371 (unsigned long long)dmz_bio_chunk(dmz->dev, bio),
373 (unsigned long long)chunk_block, nr_blocks);
376 * Invalidate blocks in the data zone and its
377 * buffer zone if one is mapped.
379 if (dmz_is_rnd(zone) || chunk_block < zone->wp_block)
380 ret = dmz_invalidate_blocks(zmd, zone, chunk_block, nr_blocks);
381 if (ret == 0 && zone->bzone)
382 ret = dmz_invalidate_blocks(zmd, zone->bzone,
383 chunk_block, nr_blocks);
390 static void dmz_handle_bio(struct dmz_target *dmz, struct dm_chunk_work *cw,
393 struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
394 struct dmz_metadata *zmd = dmz->metadata;
395 struct dm_zone *zone;
399 * Write may trigger a zone allocation. So make sure the
400 * allocation can succeed.
402 if (bio_op(bio) == REQ_OP_WRITE)
403 dmz_schedule_reclaim(dmz->reclaim);
405 dmz_lock_metadata(zmd);
408 * Get the data zone mapping the chunk. There may be no
409 * mapping for read and discard. If a mapping is obtained,
410 + the zone returned will be set to active state.
412 zone = dmz_get_chunk_mapping(zmd, dmz_bio_chunk(dmz->dev, bio),
419 /* Process the BIO */
421 dmz_activate_zone(zone);
425 switch (bio_op(bio)) {
427 ret = dmz_handle_read(dmz, zone, bio);
430 ret = dmz_handle_write(dmz, zone, bio);
433 case REQ_OP_WRITE_ZEROES:
434 ret = dmz_handle_discard(dmz, zone, bio);
437 dmz_dev_err(dmz->dev, "Unsupported BIO operation 0x%x",
443 * Release the chunk mapping. This will check that the mapping
444 * is still valid, that is, that the zone used still has valid blocks.
447 dmz_put_chunk_mapping(zmd, zone);
449 dmz_bio_endio(bio, errno_to_blk_status(ret));
451 dmz_unlock_metadata(zmd);
455 * Increment a chunk reference counter.
457 static inline void dmz_get_chunk_work(struct dm_chunk_work *cw)
459 atomic_inc(&cw->refcount);
463 * Decrement a chunk work reference count and
464 * free it if it becomes 0.
466 static void dmz_put_chunk_work(struct dm_chunk_work *cw)
468 if (atomic_dec_and_test(&cw->refcount)) {
469 WARN_ON(!bio_list_empty(&cw->bio_list));
470 radix_tree_delete(&cw->target->chunk_rxtree, cw->chunk);
476 * Chunk BIO work function.
478 static void dmz_chunk_work(struct work_struct *work)
480 struct dm_chunk_work *cw = container_of(work, struct dm_chunk_work, work);
481 struct dmz_target *dmz = cw->target;
484 mutex_lock(&dmz->chunk_lock);
486 /* Process the chunk BIOs */
487 while ((bio = bio_list_pop(&cw->bio_list))) {
488 mutex_unlock(&dmz->chunk_lock);
489 dmz_handle_bio(dmz, cw, bio);
490 mutex_lock(&dmz->chunk_lock);
491 dmz_put_chunk_work(cw);
494 /* Queueing the work incremented the work refcount */
495 dmz_put_chunk_work(cw);
497 mutex_unlock(&dmz->chunk_lock);
503 static void dmz_flush_work(struct work_struct *work)
505 struct dmz_target *dmz = container_of(work, struct dmz_target, flush_work.work);
509 /* Flush dirty metadata blocks */
510 ret = dmz_flush_metadata(dmz->metadata);
512 /* Process queued flush requests */
514 spin_lock(&dmz->flush_lock);
515 bio = bio_list_pop(&dmz->flush_list);
516 spin_unlock(&dmz->flush_lock);
521 dmz_bio_endio(bio, errno_to_blk_status(ret));
524 queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
528 * Get a chunk work and start it to process a new BIO.
529 * If the BIO chunk has no work yet, create one.
531 static void dmz_queue_chunk_work(struct dmz_target *dmz, struct bio *bio)
533 unsigned int chunk = dmz_bio_chunk(dmz->dev, bio);
534 struct dm_chunk_work *cw;
536 mutex_lock(&dmz->chunk_lock);
538 /* Get the BIO chunk work. If one is not active yet, create one */
539 cw = radix_tree_lookup(&dmz->chunk_rxtree, chunk);
543 /* Create a new chunk work */
544 cw = kmalloc(sizeof(struct dm_chunk_work), GFP_NOIO);
548 INIT_WORK(&cw->work, dmz_chunk_work);
549 atomic_set(&cw->refcount, 0);
552 bio_list_init(&cw->bio_list);
554 ret = radix_tree_insert(&dmz->chunk_rxtree, chunk, cw);
562 bio_list_add(&cw->bio_list, bio);
563 dmz_get_chunk_work(cw);
565 if (queue_work(dmz->chunk_wq, &cw->work))
566 dmz_get_chunk_work(cw);
568 mutex_unlock(&dmz->chunk_lock);
574 static int dmz_map(struct dm_target *ti, struct bio *bio)
576 struct dmz_target *dmz = ti->private;
577 struct dmz_dev *dev = dmz->dev;
578 struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
579 sector_t sector = bio->bi_iter.bi_sector;
580 unsigned int nr_sectors = bio_sectors(bio);
581 sector_t chunk_sector;
583 dmz_dev_debug(dev, "BIO op %d sector %llu + %u => chunk %llu, block %llu, %u blocks",
584 bio_op(bio), (unsigned long long)sector, nr_sectors,
585 (unsigned long long)dmz_bio_chunk(dmz->dev, bio),
586 (unsigned long long)dmz_chunk_block(dmz->dev, dmz_bio_block(bio)),
587 (unsigned int)dmz_bio_blocks(bio));
589 bio_set_dev(bio, dev->bdev);
591 if (!nr_sectors && bio_op(bio) != REQ_OP_WRITE)
592 return DM_MAPIO_REMAPPED;
594 /* The BIO should be block aligned */
595 if ((nr_sectors & DMZ_BLOCK_SECTORS_MASK) || (sector & DMZ_BLOCK_SECTORS_MASK))
596 return DM_MAPIO_KILL;
598 /* Initialize the BIO context */
599 bioctx->target = dmz;
602 atomic_set(&bioctx->ref, 1);
603 bioctx->status = BLK_STS_OK;
605 /* Set the BIO pending in the flush list */
606 if (!nr_sectors && bio_op(bio) == REQ_OP_WRITE) {
607 spin_lock(&dmz->flush_lock);
608 bio_list_add(&dmz->flush_list, bio);
609 spin_unlock(&dmz->flush_lock);
610 mod_delayed_work(dmz->flush_wq, &dmz->flush_work, 0);
611 return DM_MAPIO_SUBMITTED;
614 /* Split zone BIOs to fit entirely into a zone */
615 chunk_sector = sector & (dev->zone_nr_sectors - 1);
616 if (chunk_sector + nr_sectors > dev->zone_nr_sectors)
617 dm_accept_partial_bio(bio, dev->zone_nr_sectors - chunk_sector);
619 /* Now ready to handle this BIO */
620 dmz_reclaim_bio_acc(dmz->reclaim);
621 dmz_queue_chunk_work(dmz, bio);
623 return DM_MAPIO_SUBMITTED;
627 * Completed target BIO processing.
629 static int dmz_end_io(struct dm_target *ti, struct bio *bio, blk_status_t *error)
631 struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
633 if (bioctx->status == BLK_STS_OK && *error)
634 bioctx->status = *error;
636 if (!atomic_dec_and_test(&bioctx->ref))
637 return DM_ENDIO_INCOMPLETE;
640 bio->bi_status = bioctx->status;
643 struct dm_zone *zone = bioctx->zone;
645 if (*error && bio_op(bio) == REQ_OP_WRITE) {
646 if (dmz_is_seq(zone))
647 set_bit(DMZ_SEQ_WRITE_ERR, &zone->flags);
649 dmz_deactivate_zone(zone);
652 return DM_ENDIO_DONE;
656 * Get zoned device information.
658 static int dmz_get_zoned_device(struct dm_target *ti, char *path)
660 struct dmz_target *dmz = ti->private;
661 struct request_queue *q;
665 /* Get the target device */
666 ret = dm_get_device(ti, path, dm_table_get_mode(ti->table), &dmz->ddev);
668 ti->error = "Get target device failed";
673 dev = kzalloc(sizeof(struct dmz_dev), GFP_KERNEL);
679 dev->bdev = dmz->ddev->bdev;
680 (void)bdevname(dev->bdev, dev->name);
682 if (bdev_zoned_model(dev->bdev) == BLK_ZONED_NONE) {
683 ti->error = "Not a zoned block device";
688 dev->capacity = i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT;
689 if (ti->begin || (ti->len != dev->capacity)) {
690 ti->error = "Partial mapping not supported";
695 q = bdev_get_queue(dev->bdev);
696 dev->zone_nr_sectors = q->limits.chunk_sectors;
697 dev->zone_nr_sectors_shift = ilog2(dev->zone_nr_sectors);
699 dev->zone_nr_blocks = dmz_sect2blk(dev->zone_nr_sectors);
700 dev->zone_nr_blocks_shift = ilog2(dev->zone_nr_blocks);
702 dev->nr_zones = (dev->capacity + dev->zone_nr_sectors - 1)
703 >> dev->zone_nr_sectors_shift;
709 dm_put_device(ti, dmz->ddev);
716 * Cleanup zoned device information.
718 static void dmz_put_zoned_device(struct dm_target *ti)
720 struct dmz_target *dmz = ti->private;
722 dm_put_device(ti, dmz->ddev);
730 static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv)
732 struct dmz_target *dmz;
736 /* Check arguments */
738 ti->error = "Invalid argument count";
742 /* Allocate and initialize the target descriptor */
743 dmz = kzalloc(sizeof(struct dmz_target), GFP_KERNEL);
745 ti->error = "Unable to allocate the zoned target descriptor";
750 /* Get the target zoned block device */
751 ret = dmz_get_zoned_device(ti, argv[0]);
757 /* Initialize metadata */
759 ret = dmz_ctr_metadata(dev, &dmz->metadata);
761 ti->error = "Metadata initialization failed";
765 /* Set target (no write same support) */
766 ti->max_io_len = dev->zone_nr_sectors << 9;
767 ti->num_flush_bios = 1;
768 ti->num_discard_bios = 1;
769 ti->num_write_zeroes_bios = 1;
770 ti->per_io_data_size = sizeof(struct dmz_bioctx);
771 ti->flush_supported = true;
772 ti->discards_supported = true;
773 ti->split_discard_bios = true;
775 /* The exposed capacity is the number of chunks that can be mapped */
776 ti->len = (sector_t)dmz_nr_chunks(dmz->metadata) << dev->zone_nr_sectors_shift;
779 dmz->bio_set = bioset_create(DMZ_MIN_BIOS, 0, 0);
781 ti->error = "Create BIO set failed";
787 mutex_init(&dmz->chunk_lock);
788 INIT_RADIX_TREE(&dmz->chunk_rxtree, GFP_KERNEL);
789 dmz->chunk_wq = alloc_workqueue("dmz_cwq_%s", WQ_MEM_RECLAIM | WQ_UNBOUND,
791 if (!dmz->chunk_wq) {
792 ti->error = "Create chunk workqueue failed";
798 spin_lock_init(&dmz->flush_lock);
799 bio_list_init(&dmz->flush_list);
800 INIT_DELAYED_WORK(&dmz->flush_work, dmz_flush_work);
801 dmz->flush_wq = alloc_ordered_workqueue("dmz_fwq_%s", WQ_MEM_RECLAIM,
803 if (!dmz->flush_wq) {
804 ti->error = "Create flush workqueue failed";
808 mod_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
810 /* Initialize reclaim */
811 ret = dmz_ctr_reclaim(dev, dmz->metadata, &dmz->reclaim);
813 ti->error = "Zone reclaim initialization failed";
817 dmz_dev_info(dev, "Target device: %llu 512-byte logical sectors (%llu blocks)",
818 (unsigned long long)ti->len,
819 (unsigned long long)dmz_sect2blk(ti->len));
823 destroy_workqueue(dmz->flush_wq);
825 destroy_workqueue(dmz->chunk_wq);
827 bioset_free(dmz->bio_set);
829 dmz_dtr_metadata(dmz->metadata);
831 dmz_put_zoned_device(ti);
841 static void dmz_dtr(struct dm_target *ti)
843 struct dmz_target *dmz = ti->private;
845 flush_workqueue(dmz->chunk_wq);
846 destroy_workqueue(dmz->chunk_wq);
848 dmz_dtr_reclaim(dmz->reclaim);
850 cancel_delayed_work_sync(&dmz->flush_work);
851 destroy_workqueue(dmz->flush_wq);
853 (void) dmz_flush_metadata(dmz->metadata);
855 dmz_dtr_metadata(dmz->metadata);
857 bioset_free(dmz->bio_set);
859 dmz_put_zoned_device(ti);
865 * Setup target request queue limits.
867 static void dmz_io_hints(struct dm_target *ti, struct queue_limits *limits)
869 struct dmz_target *dmz = ti->private;
870 unsigned int chunk_sectors = dmz->dev->zone_nr_sectors;
872 limits->logical_block_size = DMZ_BLOCK_SIZE;
873 limits->physical_block_size = DMZ_BLOCK_SIZE;
875 blk_limits_io_min(limits, DMZ_BLOCK_SIZE);
876 blk_limits_io_opt(limits, DMZ_BLOCK_SIZE);
878 limits->discard_alignment = DMZ_BLOCK_SIZE;
879 limits->discard_granularity = DMZ_BLOCK_SIZE;
880 limits->max_discard_sectors = chunk_sectors;
881 limits->max_hw_discard_sectors = chunk_sectors;
882 limits->max_write_zeroes_sectors = chunk_sectors;
884 /* FS hint to try to align to the device zone size */
885 limits->chunk_sectors = chunk_sectors;
886 limits->max_sectors = chunk_sectors;
888 /* We are exposing a drive-managed zoned block device */
889 limits->zoned = BLK_ZONED_NONE;
893 * Pass on ioctl to the backend device.
895 static int dmz_prepare_ioctl(struct dm_target *ti,
896 struct block_device **bdev, fmode_t *mode)
898 struct dmz_target *dmz = ti->private;
900 *bdev = dmz->dev->bdev;
906 * Stop works on suspend.
908 static void dmz_suspend(struct dm_target *ti)
910 struct dmz_target *dmz = ti->private;
912 flush_workqueue(dmz->chunk_wq);
913 dmz_suspend_reclaim(dmz->reclaim);
914 cancel_delayed_work_sync(&dmz->flush_work);
918 * Restart works on resume or if suspend failed.
920 static void dmz_resume(struct dm_target *ti)
922 struct dmz_target *dmz = ti->private;
924 queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD);
925 dmz_resume_reclaim(dmz->reclaim);
928 static int dmz_iterate_devices(struct dm_target *ti,
929 iterate_devices_callout_fn fn, void *data)
931 struct dmz_target *dmz = ti->private;
933 return fn(ti, dmz->ddev, 0, dmz->dev->capacity, data);
936 static struct target_type dmz_type = {
938 .version = {1, 0, 0},
939 .features = DM_TARGET_SINGLETON | DM_TARGET_ZONED_HM,
940 .module = THIS_MODULE,
944 .end_io = dmz_end_io,
945 .io_hints = dmz_io_hints,
946 .prepare_ioctl = dmz_prepare_ioctl,
947 .postsuspend = dmz_suspend,
948 .resume = dmz_resume,
949 .iterate_devices = dmz_iterate_devices,
952 static int __init dmz_init(void)
954 return dm_register_target(&dmz_type);
957 static void __exit dmz_exit(void)
959 dm_unregister_target(&dmz_type);
962 module_init(dmz_init);
963 module_exit(dmz_exit);
965 MODULE_DESCRIPTION(DM_NAME " target for zoned block devices");
966 MODULE_AUTHOR("Damien Le Moal <damien.lemoal@wdc.com>");
967 MODULE_LICENSE("GPL");