1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2017 Western Digital Corporation or its affiliates.
5 * This file is released under the GPL.
10 #include <linux/module.h>
11 #include <linux/crc32.h>
12 #include <linux/sched/mm.h>
14 #define DM_MSG_PREFIX "zoned metadata"
19 #define DMZ_META_VER 2
22 * On-disk super block magic.
24 #define DMZ_MAGIC ((((unsigned int)('D')) << 24) | \
25 (((unsigned int)('Z')) << 16) | \
26 (((unsigned int)('B')) << 8) | \
27 ((unsigned int)('D')))
30 * On disk super block.
31 * This uses only 512 B but uses on disk a full 4KB block. This block is
32 * followed on disk by the mapping table of chunks to zones and the bitmap
33 * blocks indicating zone block validity.
34 * The overall resulting metadata format is:
35 * (1) Super block (1 block)
36 * (2) Chunk mapping table (nr_map_blocks)
37 * (3) Bitmap blocks (nr_bitmap_blocks)
38 * All metadata blocks are stored in conventional zones, starting from
39 * the first conventional zone found on disk.
45 /* Metadata version number */
46 __le32 version; /* 8 */
48 /* Generation number */
51 /* This block number */
52 __le64 sb_block; /* 24 */
54 /* The number of metadata blocks, including this super block */
55 __le32 nr_meta_blocks; /* 28 */
57 /* The number of sequential zones reserved for reclaim */
58 __le32 nr_reserved_seq; /* 32 */
60 /* The number of entries in the mapping table */
61 __le32 nr_chunks; /* 36 */
63 /* The number of blocks used for the chunk mapping table */
64 __le32 nr_map_blocks; /* 40 */
66 /* The number of blocks used for the block bitmaps */
67 __le32 nr_bitmap_blocks; /* 44 */
73 u8 dmz_label[32]; /* 80 */
76 u8 dmz_uuid[16]; /* 96 */
79 u8 dev_uuid[16]; /* 112 */
81 /* Padding to full 512B sector */
82 u8 reserved[400]; /* 512 */
86 * Chunk mapping entry: entries are indexed by chunk number
87 * and give the zone ID (dzone_id) mapping the chunk on disk.
88 * This zone may be sequential or random. If it is a sequential
89 * zone, a second zone (bzone_id) used as a write buffer may
90 * also be specified. This second zone will always be a randomly
99 * Chunk mapping table metadata: 512 8-bytes entries per 4KB block.
101 #define DMZ_MAP_ENTRIES (DMZ_BLOCK_SIZE / sizeof(struct dmz_map))
102 #define DMZ_MAP_ENTRIES_SHIFT (ilog2(DMZ_MAP_ENTRIES))
103 #define DMZ_MAP_ENTRIES_MASK (DMZ_MAP_ENTRIES - 1)
104 #define DMZ_MAP_UNMAPPED UINT_MAX
107 * Meta data block descriptor (for cached metadata blocks).
111 struct list_head link;
120 * Metadata block state flags.
130 * Super block information (one per metadata set).
135 struct dmz_mblock *mblk;
136 struct dmz_super *sb;
137 struct dm_zone *zone;
141 * In-memory metadata.
143 struct dmz_metadata {
145 unsigned int nr_devs;
147 char devname[BDEVNAME_SIZE];
148 char label[BDEVNAME_SIZE];
151 sector_t zone_bitmap_size;
152 unsigned int zone_nr_bitmap_blocks;
153 unsigned int zone_bits_per_mblk;
155 sector_t zone_nr_blocks;
156 sector_t zone_nr_blocks_shift;
158 sector_t zone_nr_sectors;
159 sector_t zone_nr_sectors_shift;
161 unsigned int nr_bitmap_blocks;
162 unsigned int nr_map_blocks;
164 unsigned int nr_zones;
165 unsigned int nr_useable_zones;
166 unsigned int nr_meta_blocks;
167 unsigned int nr_meta_zones;
168 unsigned int nr_data_zones;
169 unsigned int nr_cache_zones;
170 unsigned int nr_rnd_zones;
171 unsigned int nr_reserved_seq;
172 unsigned int nr_chunks;
174 /* Zone information array */
178 unsigned int mblk_primary;
179 unsigned int sb_version;
181 unsigned int min_nr_mblks;
182 unsigned int max_nr_mblks;
184 struct rw_semaphore mblk_sem;
185 struct mutex mblk_flush_lock;
186 spinlock_t mblk_lock;
187 struct rb_root mblk_rbtree;
188 struct list_head mblk_lru_list;
189 struct list_head mblk_dirty_list;
190 struct shrinker mblk_shrinker;
192 /* Zone allocation management */
193 struct mutex map_lock;
194 struct dmz_mblock **map_mblk;
196 unsigned int nr_cache;
197 atomic_t unmap_nr_cache;
198 struct list_head unmap_cache_list;
199 struct list_head map_cache_list;
201 atomic_t nr_reserved_seq_zones;
202 struct list_head reserved_seq_zones_list;
204 wait_queue_head_t free_wq;
207 #define dmz_zmd_info(zmd, format, args...) \
208 DMINFO("(%s): " format, (zmd)->label, ## args)
210 #define dmz_zmd_err(zmd, format, args...) \
211 DMERR("(%s): " format, (zmd)->label, ## args)
213 #define dmz_zmd_warn(zmd, format, args...) \
214 DMWARN("(%s): " format, (zmd)->label, ## args)
216 #define dmz_zmd_debug(zmd, format, args...) \
217 DMDEBUG("(%s): " format, (zmd)->label, ## args)
221 static unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone)
226 return zone->id - zone->dev->zone_offset;
229 sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone)
231 unsigned int zone_id = dmz_dev_zone_id(zmd, zone);
233 return (sector_t)zone_id << zmd->zone_nr_sectors_shift;
236 sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone)
238 unsigned int zone_id = dmz_dev_zone_id(zmd, zone);
240 return (sector_t)zone_id << zmd->zone_nr_blocks_shift;
243 unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd)
245 return zmd->zone_nr_blocks;
248 unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd)
250 return zmd->zone_nr_blocks_shift;
253 unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd)
255 return zmd->zone_nr_sectors;
258 unsigned int dmz_zone_nr_sectors_shift(struct dmz_metadata *zmd)
260 return zmd->zone_nr_sectors_shift;
263 unsigned int dmz_nr_zones(struct dmz_metadata *zmd)
265 return zmd->nr_zones;
268 unsigned int dmz_nr_chunks(struct dmz_metadata *zmd)
270 return zmd->nr_chunks;
273 unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd, int idx)
275 return zmd->dev[idx].nr_rnd;
278 unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd, int idx)
280 return atomic_read(&zmd->dev[idx].unmap_nr_rnd);
283 unsigned int dmz_nr_cache_zones(struct dmz_metadata *zmd)
285 return zmd->nr_cache;
288 unsigned int dmz_nr_unmap_cache_zones(struct dmz_metadata *zmd)
290 return atomic_read(&zmd->unmap_nr_cache);
293 unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd, int idx)
295 return zmd->dev[idx].nr_seq;
298 unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd, int idx)
300 return atomic_read(&zmd->dev[idx].unmap_nr_seq);
303 static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id)
305 return xa_load(&zmd->zones, zone_id);
308 static struct dm_zone *dmz_insert(struct dmz_metadata *zmd,
309 unsigned int zone_id, struct dmz_dev *dev)
311 struct dm_zone *zone = kzalloc(sizeof(struct dm_zone), GFP_KERNEL);
314 return ERR_PTR(-ENOMEM);
316 if (xa_insert(&zmd->zones, zone_id, zone, GFP_KERNEL)) {
318 return ERR_PTR(-EBUSY);
321 INIT_LIST_HEAD(&zone->link);
322 atomic_set(&zone->refcount, 0);
324 zone->chunk = DMZ_MAP_UNMAPPED;
330 const char *dmz_metadata_label(struct dmz_metadata *zmd)
332 return (const char *)zmd->label;
335 bool dmz_check_dev(struct dmz_metadata *zmd)
339 for (i = 0; i < zmd->nr_devs; i++) {
340 if (!dmz_check_bdev(&zmd->dev[i]))
346 bool dmz_dev_is_dying(struct dmz_metadata *zmd)
350 for (i = 0; i < zmd->nr_devs; i++) {
351 if (dmz_bdev_is_dying(&zmd->dev[i]))
358 * Lock/unlock mapping table.
359 * The map lock also protects all the zone lists.
361 void dmz_lock_map(struct dmz_metadata *zmd)
363 mutex_lock(&zmd->map_lock);
366 void dmz_unlock_map(struct dmz_metadata *zmd)
368 mutex_unlock(&zmd->map_lock);
372 * Lock/unlock metadata access. This is a "read" lock on a semaphore
373 * that prevents metadata flush from running while metadata are being
374 * modified. The actual metadata write mutual exclusion is achieved with
375 * the map lock and zone state management (active and reclaim state are
376 * mutually exclusive).
378 void dmz_lock_metadata(struct dmz_metadata *zmd)
380 down_read(&zmd->mblk_sem);
383 void dmz_unlock_metadata(struct dmz_metadata *zmd)
385 up_read(&zmd->mblk_sem);
389 * Lock/unlock flush: prevent concurrent executions
390 * of dmz_flush_metadata as well as metadata modification in reclaim
391 * while flush is being executed.
393 void dmz_lock_flush(struct dmz_metadata *zmd)
395 mutex_lock(&zmd->mblk_flush_lock);
398 void dmz_unlock_flush(struct dmz_metadata *zmd)
400 mutex_unlock(&zmd->mblk_flush_lock);
404 * Allocate a metadata block.
406 static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd,
409 struct dmz_mblock *mblk = NULL;
411 /* See if we can reuse cached blocks */
412 if (zmd->max_nr_mblks && atomic_read(&zmd->nr_mblks) > zmd->max_nr_mblks) {
413 spin_lock(&zmd->mblk_lock);
414 mblk = list_first_entry_or_null(&zmd->mblk_lru_list,
415 struct dmz_mblock, link);
417 list_del_init(&mblk->link);
418 rb_erase(&mblk->node, &zmd->mblk_rbtree);
421 spin_unlock(&zmd->mblk_lock);
426 /* Allocate a new block */
427 mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO);
431 mblk->page = alloc_page(GFP_NOIO);
437 RB_CLEAR_NODE(&mblk->node);
438 INIT_LIST_HEAD(&mblk->link);
442 mblk->data = page_address(mblk->page);
444 atomic_inc(&zmd->nr_mblks);
450 * Free a metadata block.
452 static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk)
454 __free_pages(mblk->page, 0);
457 atomic_dec(&zmd->nr_mblks);
461 * Insert a metadata block in the rbtree.
463 static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk)
465 struct rb_root *root = &zmd->mblk_rbtree;
466 struct rb_node **new = &(root->rb_node), *parent = NULL;
467 struct dmz_mblock *b;
469 /* Figure out where to put the new node */
471 b = container_of(*new, struct dmz_mblock, node);
473 new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right);
476 /* Add new node and rebalance tree */
477 rb_link_node(&mblk->node, parent, new);
478 rb_insert_color(&mblk->node, root);
482 * Lookup a metadata block in the rbtree. If the block is found, increment
483 * its reference count.
485 static struct dmz_mblock *dmz_get_mblock_fast(struct dmz_metadata *zmd,
488 struct rb_root *root = &zmd->mblk_rbtree;
489 struct rb_node *node = root->rb_node;
490 struct dmz_mblock *mblk;
493 mblk = container_of(node, struct dmz_mblock, node);
494 if (mblk->no == mblk_no) {
496 * If this is the first reference to the block,
497 * remove it from the LRU list.
500 if (mblk->ref == 1 &&
501 !test_bit(DMZ_META_DIRTY, &mblk->state))
502 list_del_init(&mblk->link);
505 node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right;
512 * Metadata block BIO end callback.
514 static void dmz_mblock_bio_end_io(struct bio *bio)
516 struct dmz_mblock *mblk = bio->bi_private;
520 set_bit(DMZ_META_ERROR, &mblk->state);
522 if (bio_op(bio) == REQ_OP_WRITE)
523 flag = DMZ_META_WRITING;
525 flag = DMZ_META_READING;
527 clear_bit_unlock(flag, &mblk->state);
528 smp_mb__after_atomic();
529 wake_up_bit(&mblk->state, flag);
535 * Read an uncached metadata block from disk and add it to the cache.
537 static struct dmz_mblock *dmz_get_mblock_slow(struct dmz_metadata *zmd,
540 struct dmz_mblock *mblk, *m;
541 sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no;
542 struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev;
545 if (dmz_bdev_is_dying(dev))
546 return ERR_PTR(-EIO);
548 /* Get a new block and a BIO to read it */
549 mblk = dmz_alloc_mblock(zmd, mblk_no);
551 return ERR_PTR(-ENOMEM);
553 bio = bio_alloc(GFP_NOIO, 1);
555 dmz_free_mblock(zmd, mblk);
556 return ERR_PTR(-ENOMEM);
559 spin_lock(&zmd->mblk_lock);
562 * Make sure that another context did not start reading
565 m = dmz_get_mblock_fast(zmd, mblk_no);
567 spin_unlock(&zmd->mblk_lock);
568 dmz_free_mblock(zmd, mblk);
574 set_bit(DMZ_META_READING, &mblk->state);
575 dmz_insert_mblock(zmd, mblk);
577 spin_unlock(&zmd->mblk_lock);
579 /* Submit read BIO */
580 bio->bi_iter.bi_sector = dmz_blk2sect(block);
581 bio_set_dev(bio, dev->bdev);
582 bio->bi_private = mblk;
583 bio->bi_end_io = dmz_mblock_bio_end_io;
584 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META | REQ_PRIO);
585 bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0);
592 * Free metadata blocks.
594 static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd,
597 struct dmz_mblock *mblk;
598 unsigned long count = 0;
600 if (!zmd->max_nr_mblks)
603 while (!list_empty(&zmd->mblk_lru_list) &&
604 atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks &&
606 mblk = list_first_entry(&zmd->mblk_lru_list,
607 struct dmz_mblock, link);
608 list_del_init(&mblk->link);
609 rb_erase(&mblk->node, &zmd->mblk_rbtree);
610 dmz_free_mblock(zmd, mblk);
618 * For mblock shrinker: get the number of unused metadata blocks in the cache.
620 static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink,
621 struct shrink_control *sc)
623 struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker);
625 return atomic_read(&zmd->nr_mblks);
629 * For mblock shrinker: scan unused metadata blocks and shrink the cache.
631 static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink,
632 struct shrink_control *sc)
634 struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker);
637 spin_lock(&zmd->mblk_lock);
638 count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan);
639 spin_unlock(&zmd->mblk_lock);
641 return count ? count : SHRINK_STOP;
645 * Release a metadata block.
647 static void dmz_release_mblock(struct dmz_metadata *zmd,
648 struct dmz_mblock *mblk)
654 spin_lock(&zmd->mblk_lock);
657 if (mblk->ref == 0) {
658 if (test_bit(DMZ_META_ERROR, &mblk->state)) {
659 rb_erase(&mblk->node, &zmd->mblk_rbtree);
660 dmz_free_mblock(zmd, mblk);
661 } else if (!test_bit(DMZ_META_DIRTY, &mblk->state)) {
662 list_add_tail(&mblk->link, &zmd->mblk_lru_list);
663 dmz_shrink_mblock_cache(zmd, 1);
667 spin_unlock(&zmd->mblk_lock);
671 * Get a metadata block from the rbtree. If the block
672 * is not present, read it from disk.
674 static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd,
677 struct dmz_mblock *mblk;
678 struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev;
681 spin_lock(&zmd->mblk_lock);
682 mblk = dmz_get_mblock_fast(zmd, mblk_no);
683 spin_unlock(&zmd->mblk_lock);
686 /* Cache miss: read the block from disk */
687 mblk = dmz_get_mblock_slow(zmd, mblk_no);
692 /* Wait for on-going read I/O and check for error */
693 wait_on_bit_io(&mblk->state, DMZ_META_READING,
694 TASK_UNINTERRUPTIBLE);
695 if (test_bit(DMZ_META_ERROR, &mblk->state)) {
696 dmz_release_mblock(zmd, mblk);
698 return ERR_PTR(-EIO);
705 * Mark a metadata block dirty.
707 static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk)
709 spin_lock(&zmd->mblk_lock);
710 if (!test_and_set_bit(DMZ_META_DIRTY, &mblk->state))
711 list_add_tail(&mblk->link, &zmd->mblk_dirty_list);
712 spin_unlock(&zmd->mblk_lock);
716 * Issue a metadata block write BIO.
718 static int dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk,
721 struct dmz_dev *dev = zmd->sb[set].dev;
722 sector_t block = zmd->sb[set].block + mblk->no;
725 if (dmz_bdev_is_dying(dev))
728 bio = bio_alloc(GFP_NOIO, 1);
730 set_bit(DMZ_META_ERROR, &mblk->state);
734 set_bit(DMZ_META_WRITING, &mblk->state);
736 bio->bi_iter.bi_sector = dmz_blk2sect(block);
737 bio_set_dev(bio, dev->bdev);
738 bio->bi_private = mblk;
739 bio->bi_end_io = dmz_mblock_bio_end_io;
740 bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_META | REQ_PRIO);
741 bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0);
748 * Read/write a metadata block.
750 static int dmz_rdwr_block(struct dmz_dev *dev, int op,
751 sector_t block, struct page *page)
759 if (dmz_bdev_is_dying(dev))
762 bio = bio_alloc(GFP_NOIO, 1);
766 bio->bi_iter.bi_sector = dmz_blk2sect(block);
767 bio_set_dev(bio, dev->bdev);
768 bio_set_op_attrs(bio, op, REQ_SYNC | REQ_META | REQ_PRIO);
769 bio_add_page(bio, page, DMZ_BLOCK_SIZE, 0);
770 ret = submit_bio_wait(bio);
779 * Write super block of the specified metadata set.
781 static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set)
783 struct dmz_mblock *mblk = zmd->sb[set].mblk;
784 struct dmz_super *sb = zmd->sb[set].sb;
785 struct dmz_dev *dev = zmd->sb[set].dev;
787 u64 sb_gen = zmd->sb_gen + 1;
790 sb->magic = cpu_to_le32(DMZ_MAGIC);
792 sb->version = cpu_to_le32(zmd->sb_version);
793 if (zmd->sb_version > 1) {
794 BUILD_BUG_ON(UUID_SIZE != 16);
795 export_uuid(sb->dmz_uuid, &zmd->uuid);
796 memcpy(sb->dmz_label, zmd->label, BDEVNAME_SIZE);
797 export_uuid(sb->dev_uuid, &dev->uuid);
800 sb->gen = cpu_to_le64(sb_gen);
803 * The metadata always references the absolute block address,
804 * ie relative to the entire block range, not the per-device
807 sb_block = zmd->sb[set].zone->id << zmd->zone_nr_blocks_shift;
808 sb->sb_block = cpu_to_le64(sb_block);
809 sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks);
810 sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq);
811 sb->nr_chunks = cpu_to_le32(zmd->nr_chunks);
813 sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks);
814 sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks);
817 sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE));
819 ret = dmz_rdwr_block(dev, REQ_OP_WRITE, zmd->sb[set].block,
822 ret = blkdev_issue_flush(dev->bdev, GFP_NOIO);
828 * Write dirty metadata blocks to the specified set.
830 static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd,
831 struct list_head *write_list,
834 struct dmz_mblock *mblk;
835 struct dmz_dev *dev = zmd->sb[set].dev;
836 struct blk_plug plug;
837 int ret = 0, nr_mblks_submitted = 0;
840 blk_start_plug(&plug);
841 list_for_each_entry(mblk, write_list, link) {
842 ret = dmz_write_mblock(zmd, mblk, set);
845 nr_mblks_submitted++;
847 blk_finish_plug(&plug);
849 /* Wait for completion */
850 list_for_each_entry(mblk, write_list, link) {
851 if (!nr_mblks_submitted)
853 wait_on_bit_io(&mblk->state, DMZ_META_WRITING,
854 TASK_UNINTERRUPTIBLE);
855 if (test_bit(DMZ_META_ERROR, &mblk->state)) {
856 clear_bit(DMZ_META_ERROR, &mblk->state);
860 nr_mblks_submitted--;
863 /* Flush drive cache (this will also sync data) */
865 ret = blkdev_issue_flush(dev->bdev, GFP_NOIO);
871 * Log dirty metadata blocks.
873 static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd,
874 struct list_head *write_list)
876 unsigned int log_set = zmd->mblk_primary ^ 0x1;
879 /* Write dirty blocks to the log */
880 ret = dmz_write_dirty_mblocks(zmd, write_list, log_set);
885 * No error so far: now validate the log by updating the
886 * log index super block generation.
888 ret = dmz_write_sb(zmd, log_set);
896 * Flush dirty metadata blocks.
898 int dmz_flush_metadata(struct dmz_metadata *zmd)
900 struct dmz_mblock *mblk;
901 struct list_head write_list;
908 INIT_LIST_HEAD(&write_list);
911 * Make sure that metadata blocks are stable before logging: take
912 * the write lock on the metadata semaphore to prevent target BIOs
913 * from modifying metadata.
915 down_write(&zmd->mblk_sem);
916 dev = zmd->sb[zmd->mblk_primary].dev;
919 * This is called from the target flush work and reclaim work.
920 * Concurrent execution is not allowed.
924 if (dmz_bdev_is_dying(dev)) {
929 /* Get dirty blocks */
930 spin_lock(&zmd->mblk_lock);
931 list_splice_init(&zmd->mblk_dirty_list, &write_list);
932 spin_unlock(&zmd->mblk_lock);
934 /* If there are no dirty metadata blocks, just flush the device cache */
935 if (list_empty(&write_list)) {
936 ret = blkdev_issue_flush(dev->bdev, GFP_NOIO);
941 * The primary metadata set is still clean. Keep it this way until
942 * all updates are successful in the secondary set. That is, use
943 * the secondary set as a log.
945 ret = dmz_log_dirty_mblocks(zmd, &write_list);
950 * The log is on disk. It is now safe to update in place
951 * in the primary metadata set.
953 ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary);
957 ret = dmz_write_sb(zmd, zmd->mblk_primary);
961 while (!list_empty(&write_list)) {
962 mblk = list_first_entry(&write_list, struct dmz_mblock, link);
963 list_del_init(&mblk->link);
965 spin_lock(&zmd->mblk_lock);
966 clear_bit(DMZ_META_DIRTY, &mblk->state);
968 list_add_tail(&mblk->link, &zmd->mblk_lru_list);
969 spin_unlock(&zmd->mblk_lock);
974 dmz_unlock_flush(zmd);
975 up_write(&zmd->mblk_sem);
980 if (!list_empty(&write_list)) {
981 spin_lock(&zmd->mblk_lock);
982 list_splice(&write_list, &zmd->mblk_dirty_list);
983 spin_unlock(&zmd->mblk_lock);
985 if (!dmz_check_bdev(dev))
993 static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_sb *dsb,
996 struct dmz_super *sb = dsb->sb;
997 struct dmz_dev *dev = dsb->dev;
998 unsigned int nr_meta_zones, nr_data_zones;
1002 if (le32_to_cpu(sb->magic) != DMZ_MAGIC) {
1003 dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)",
1004 DMZ_MAGIC, le32_to_cpu(sb->magic));
1008 zmd->sb_version = le32_to_cpu(sb->version);
1009 if (zmd->sb_version > DMZ_META_VER) {
1010 dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)",
1011 DMZ_META_VER, zmd->sb_version);
1014 if (zmd->sb_version < 2 && tertiary) {
1015 dmz_dev_err(dev, "Tertiary superblocks are not supported");
1019 gen = le64_to_cpu(sb->gen);
1020 stored_crc = le32_to_cpu(sb->crc);
1022 crc = crc32_le(gen, (unsigned char *)sb, DMZ_BLOCK_SIZE);
1023 if (crc != stored_crc) {
1024 dmz_dev_err(dev, "Invalid checksum (needed 0x%08x, got 0x%08x)",
1029 sb_block = le64_to_cpu(sb->sb_block);
1030 if (sb_block != (u64)dsb->zone->id << zmd->zone_nr_blocks_shift ) {
1031 dmz_dev_err(dev, "Invalid superblock position "
1032 "(is %llu expected %llu)",
1034 (u64)dsb->zone->id << zmd->zone_nr_blocks_shift);
1037 if (zmd->sb_version > 1) {
1040 import_uuid(&sb_uuid, sb->dmz_uuid);
1041 if (uuid_is_null(&sb_uuid)) {
1042 dmz_dev_err(dev, "NULL DM-Zoned uuid");
1044 } else if (uuid_is_null(&zmd->uuid)) {
1045 uuid_copy(&zmd->uuid, &sb_uuid);
1046 } else if (!uuid_equal(&zmd->uuid, &sb_uuid)) {
1047 dmz_dev_err(dev, "mismatching DM-Zoned uuid, "
1048 "is %pUl expected %pUl",
1049 &sb_uuid, &zmd->uuid);
1052 if (!strlen(zmd->label))
1053 memcpy(zmd->label, sb->dmz_label, BDEVNAME_SIZE);
1054 else if (memcmp(zmd->label, sb->dmz_label, BDEVNAME_SIZE)) {
1055 dmz_dev_err(dev, "mismatching DM-Zoned label, "
1056 "is %s expected %s",
1057 sb->dmz_label, zmd->label);
1060 import_uuid(&dev->uuid, sb->dev_uuid);
1061 if (uuid_is_null(&dev->uuid)) {
1062 dmz_dev_err(dev, "NULL device uuid");
1068 * Generation number should be 0, but it doesn't
1069 * really matter if it isn't.
1072 dmz_dev_warn(dev, "Invalid generation %llu",
1078 nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + zmd->zone_nr_blocks - 1)
1079 >> zmd->zone_nr_blocks_shift;
1080 if (!nr_meta_zones ||
1081 nr_meta_zones >= zmd->nr_rnd_zones) {
1082 dmz_dev_err(dev, "Invalid number of metadata blocks");
1086 if (!le32_to_cpu(sb->nr_reserved_seq) ||
1087 le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) {
1088 dmz_dev_err(dev, "Invalid number of reserved sequential zones");
1092 nr_data_zones = zmd->nr_useable_zones -
1093 (nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq));
1094 if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) {
1095 dmz_dev_err(dev, "Invalid number of chunks %u / %u",
1096 le32_to_cpu(sb->nr_chunks), nr_data_zones);
1101 zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks);
1102 zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq);
1103 zmd->nr_chunks = le32_to_cpu(sb->nr_chunks);
1104 zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks);
1105 zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks);
1106 zmd->nr_meta_zones = nr_meta_zones;
1107 zmd->nr_data_zones = nr_data_zones;
1113 * Read the first or second super block from disk.
1115 static int dmz_read_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set)
1117 dmz_zmd_debug(zmd, "read superblock set %d dev %s block %llu",
1118 set, sb->dev->name, sb->block);
1120 return dmz_rdwr_block(sb->dev, REQ_OP_READ,
1121 sb->block, sb->mblk->page);
1125 * Determine the position of the secondary super blocks on disk.
1126 * This is used only if a corruption of the primary super block
1129 static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd)
1131 unsigned int zone_nr_blocks = zmd->zone_nr_blocks;
1132 struct dmz_mblock *mblk;
1133 unsigned int zone_id = zmd->sb[0].zone->id;
1136 /* Allocate a block */
1137 mblk = dmz_alloc_mblock(zmd, 0);
1141 zmd->sb[1].mblk = mblk;
1142 zmd->sb[1].sb = mblk->data;
1144 /* Bad first super block: search for the second one */
1145 zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks;
1146 zmd->sb[1].zone = dmz_get(zmd, zone_id + 1);
1147 zmd->sb[1].dev = zmd->sb[0].dev;
1148 for (i = 1; i < zmd->nr_rnd_zones; i++) {
1149 if (dmz_read_sb(zmd, &zmd->sb[1], 1) != 0)
1151 if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC)
1153 zmd->sb[1].block += zone_nr_blocks;
1154 zmd->sb[1].zone = dmz_get(zmd, zone_id + i);
1157 dmz_free_mblock(zmd, mblk);
1158 zmd->sb[1].mblk = NULL;
1159 zmd->sb[1].zone = NULL;
1160 zmd->sb[1].dev = NULL;
1166 * Read a super block from disk.
1168 static int dmz_get_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set)
1170 struct dmz_mblock *mblk;
1173 /* Allocate a block */
1174 mblk = dmz_alloc_mblock(zmd, 0);
1179 sb->sb = mblk->data;
1181 /* Read super block */
1182 ret = dmz_read_sb(zmd, sb, set);
1184 dmz_free_mblock(zmd, mblk);
1193 * Recover a metadata set.
1195 static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set)
1197 unsigned int src_set = dst_set ^ 0x1;
1201 dmz_dev_warn(zmd->sb[dst_set].dev,
1202 "Metadata set %u invalid: recovering", dst_set);
1205 zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
1207 zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
1209 page = alloc_page(GFP_NOIO);
1213 /* Copy metadata blocks */
1214 for (i = 1; i < zmd->nr_meta_blocks; i++) {
1215 ret = dmz_rdwr_block(zmd->sb[src_set].dev, REQ_OP_READ,
1216 zmd->sb[src_set].block + i, page);
1219 ret = dmz_rdwr_block(zmd->sb[dst_set].dev, REQ_OP_WRITE,
1220 zmd->sb[dst_set].block + i, page);
1225 /* Finalize with the super block */
1226 if (!zmd->sb[dst_set].mblk) {
1227 zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0);
1228 if (!zmd->sb[dst_set].mblk) {
1232 zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data;
1235 ret = dmz_write_sb(zmd, dst_set);
1237 __free_pages(page, 0);
1243 * Get super block from disk.
1245 static int dmz_load_sb(struct dmz_metadata *zmd)
1247 bool sb_good[2] = {false, false};
1248 u64 sb_gen[2] = {0, 0};
1251 if (!zmd->sb[0].zone) {
1252 dmz_zmd_err(zmd, "Primary super block zone not set");
1256 /* Read and check the primary super block */
1257 zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
1258 zmd->sb[0].dev = zmd->sb[0].zone->dev;
1259 ret = dmz_get_sb(zmd, &zmd->sb[0], 0);
1261 dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed");
1265 ret = dmz_check_sb(zmd, &zmd->sb[0], false);
1267 /* Read and check secondary super block */
1270 if (!zmd->sb[1].zone) {
1271 unsigned int zone_id =
1272 zmd->sb[0].zone->id + zmd->nr_meta_zones;
1274 zmd->sb[1].zone = dmz_get(zmd, zone_id);
1276 zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
1277 zmd->sb[1].dev = zmd->sb[0].dev;
1278 ret = dmz_get_sb(zmd, &zmd->sb[1], 1);
1280 ret = dmz_lookup_secondary_sb(zmd);
1283 dmz_dev_err(zmd->sb[1].dev, "Read secondary super block failed");
1287 ret = dmz_check_sb(zmd, &zmd->sb[1], false);
1291 /* Use highest generation sb first */
1292 if (!sb_good[0] && !sb_good[1]) {
1293 dmz_zmd_err(zmd, "No valid super block found");
1298 sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen);
1300 ret = dmz_recover_mblocks(zmd, 0);
1302 dmz_dev_err(zmd->sb[0].dev,
1303 "Recovery of superblock 0 failed");
1309 sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen);
1311 ret = dmz_recover_mblocks(zmd, 1);
1314 dmz_dev_err(zmd->sb[1].dev,
1315 "Recovery of superblock 1 failed");
1320 if (sb_gen[0] >= sb_gen[1]) {
1321 zmd->sb_gen = sb_gen[0];
1322 zmd->mblk_primary = 0;
1324 zmd->sb_gen = sb_gen[1];
1325 zmd->mblk_primary = 1;
1328 dmz_dev_debug(zmd->sb[zmd->mblk_primary].dev,
1329 "Using super block %u (gen %llu)",
1330 zmd->mblk_primary, zmd->sb_gen);
1332 if (zmd->sb_version > 1) {
1336 sb = kzalloc(sizeof(struct dmz_sb), GFP_KERNEL);
1339 for (i = 1; i < zmd->nr_devs; i++) {
1341 sb->zone = dmz_get(zmd, zmd->dev[i].zone_offset);
1342 sb->dev = &zmd->dev[i];
1343 if (!dmz_is_meta(sb->zone)) {
1344 dmz_dev_err(sb->dev,
1345 "Tertiary super block zone %u not marked as metadata zone",
1350 ret = dmz_get_sb(zmd, sb, i + 1);
1352 dmz_dev_err(sb->dev,
1353 "Read tertiary super block failed");
1354 dmz_free_mblock(zmd, sb->mblk);
1357 ret = dmz_check_sb(zmd, sb, true);
1358 dmz_free_mblock(zmd, sb->mblk);
1369 * Initialize a zone descriptor.
1371 static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
1373 struct dmz_dev *dev = data;
1374 struct dmz_metadata *zmd = dev->metadata;
1375 int idx = num + dev->zone_offset;
1376 struct dm_zone *zone;
1378 zone = dmz_insert(zmd, idx, dev);
1380 return PTR_ERR(zone);
1382 if (blkz->len != zmd->zone_nr_sectors) {
1383 if (zmd->sb_version > 1) {
1384 /* Ignore the eventual runt (smaller) zone */
1385 set_bit(DMZ_OFFLINE, &zone->flags);
1387 } else if (blkz->start + blkz->len == dev->capacity)
1392 switch (blkz->type) {
1393 case BLK_ZONE_TYPE_CONVENTIONAL:
1394 set_bit(DMZ_RND, &zone->flags);
1396 case BLK_ZONE_TYPE_SEQWRITE_REQ:
1397 case BLK_ZONE_TYPE_SEQWRITE_PREF:
1398 set_bit(DMZ_SEQ, &zone->flags);
1404 if (dmz_is_rnd(zone))
1407 zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start);
1409 if (blkz->cond == BLK_ZONE_COND_OFFLINE)
1410 set_bit(DMZ_OFFLINE, &zone->flags);
1411 else if (blkz->cond == BLK_ZONE_COND_READONLY)
1412 set_bit(DMZ_READ_ONLY, &zone->flags);
1414 zmd->nr_useable_zones++;
1415 if (dmz_is_rnd(zone)) {
1416 zmd->nr_rnd_zones++;
1417 if (zmd->nr_devs == 1 && !zmd->sb[0].zone) {
1418 /* Primary super block zone */
1419 zmd->sb[0].zone = zone;
1422 if (zmd->nr_devs > 1 && num == 0) {
1424 * Tertiary superblock zones are always at the
1425 * start of the zoned devices, so mark them
1428 set_bit(DMZ_META, &zone->flags);
1434 static int dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev)
1437 sector_t zone_offset = 0;
1439 for(idx = 0; idx < dev->nr_zones; idx++) {
1440 struct dm_zone *zone;
1442 zone = dmz_insert(zmd, idx, dev);
1444 return PTR_ERR(zone);
1445 set_bit(DMZ_CACHE, &zone->flags);
1447 zmd->nr_cache_zones++;
1448 zmd->nr_useable_zones++;
1449 if (dev->capacity - zone_offset < zmd->zone_nr_sectors) {
1450 /* Disable runt zone */
1451 set_bit(DMZ_OFFLINE, &zone->flags);
1454 zone_offset += zmd->zone_nr_sectors;
1460 * Free zones descriptors.
1462 static void dmz_drop_zones(struct dmz_metadata *zmd)
1466 for(idx = 0; idx < zmd->nr_zones; idx++) {
1467 struct dm_zone *zone = xa_load(&zmd->zones, idx);
1470 xa_erase(&zmd->zones, idx);
1472 xa_destroy(&zmd->zones);
1476 * Allocate and initialize zone descriptors using the zone
1477 * information from disk.
1479 static int dmz_init_zones(struct dmz_metadata *zmd)
1482 struct dmz_dev *zoned_dev = &zmd->dev[0];
1485 zmd->zone_nr_sectors = zmd->dev[0].zone_nr_sectors;
1486 zmd->zone_nr_sectors_shift = ilog2(zmd->zone_nr_sectors);
1487 zmd->zone_nr_blocks = dmz_sect2blk(zmd->zone_nr_sectors);
1488 zmd->zone_nr_blocks_shift = ilog2(zmd->zone_nr_blocks);
1489 zmd->zone_bitmap_size = zmd->zone_nr_blocks >> 3;
1490 zmd->zone_nr_bitmap_blocks =
1491 max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT);
1492 zmd->zone_bits_per_mblk = min_t(sector_t, zmd->zone_nr_blocks,
1493 DMZ_BLOCK_SIZE_BITS);
1495 /* Allocate zone array */
1497 for (i = 0; i < zmd->nr_devs; i++) {
1498 struct dmz_dev *dev = &zmd->dev[i];
1500 dev->metadata = zmd;
1501 zmd->nr_zones += dev->nr_zones;
1503 atomic_set(&dev->unmap_nr_rnd, 0);
1504 INIT_LIST_HEAD(&dev->unmap_rnd_list);
1505 INIT_LIST_HEAD(&dev->map_rnd_list);
1507 atomic_set(&dev->unmap_nr_seq, 0);
1508 INIT_LIST_HEAD(&dev->unmap_seq_list);
1509 INIT_LIST_HEAD(&dev->map_seq_list);
1512 if (!zmd->nr_zones) {
1513 DMERR("(%s): No zones found", zmd->devname);
1516 xa_init(&zmd->zones);
1518 DMDEBUG("(%s): Using %zu B for zone information",
1519 zmd->devname, sizeof(struct dm_zone) * zmd->nr_zones);
1521 if (zmd->nr_devs > 1) {
1522 ret = dmz_emulate_zones(zmd, &zmd->dev[0]);
1524 DMDEBUG("(%s): Failed to emulate zones, error %d",
1526 dmz_drop_zones(zmd);
1531 * Primary superblock zone is always at zone 0 when multiple
1532 * drives are present.
1534 zmd->sb[0].zone = dmz_get(zmd, 0);
1536 for (i = 1; i < zmd->nr_devs; i++) {
1537 zoned_dev = &zmd->dev[i];
1539 ret = blkdev_report_zones(zoned_dev->bdev, 0,
1541 dmz_init_zone, zoned_dev);
1543 DMDEBUG("(%s): Failed to report zones, error %d",
1545 dmz_drop_zones(zmd);
1553 * Get zone information and initialize zone descriptors. At the same
1554 * time, determine where the super block should be: first block of the
1555 * first randomly writable zone.
1557 ret = blkdev_report_zones(zoned_dev->bdev, 0, BLK_ALL_ZONES,
1558 dmz_init_zone, zoned_dev);
1560 DMDEBUG("(%s): Failed to report zones, error %d",
1562 dmz_drop_zones(zmd);
1569 static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx,
1572 struct dm_zone *zone = data;
1574 clear_bit(DMZ_OFFLINE, &zone->flags);
1575 clear_bit(DMZ_READ_ONLY, &zone->flags);
1576 if (blkz->cond == BLK_ZONE_COND_OFFLINE)
1577 set_bit(DMZ_OFFLINE, &zone->flags);
1578 else if (blkz->cond == BLK_ZONE_COND_READONLY)
1579 set_bit(DMZ_READ_ONLY, &zone->flags);
1581 if (dmz_is_seq(zone))
1582 zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start);
1589 * Update a zone information.
1591 static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
1593 struct dmz_dev *dev = zone->dev;
1594 unsigned int noio_flag;
1597 if (dev->flags & DMZ_BDEV_REGULAR)
1601 * Get zone information from disk. Since blkdev_report_zones() uses
1602 * GFP_KERNEL by default for memory allocations, set the per-task
1603 * PF_MEMALLOC_NOIO flag so that all allocations are done as if
1604 * GFP_NOIO was specified.
1606 noio_flag = memalloc_noio_save();
1607 ret = blkdev_report_zones(dev->bdev, dmz_start_sect(zmd, zone), 1,
1608 dmz_update_zone_cb, zone);
1609 memalloc_noio_restore(noio_flag);
1614 dmz_dev_err(dev, "Get zone %u report failed",
1616 dmz_check_bdev(dev);
1624 * Check a zone write pointer position when the zone is marked
1625 * with the sequential write error flag.
1627 static int dmz_handle_seq_write_err(struct dmz_metadata *zmd,
1628 struct dm_zone *zone)
1630 struct dmz_dev *dev = zone->dev;
1631 unsigned int wp = 0;
1634 wp = zone->wp_block;
1635 ret = dmz_update_zone(zmd, zone);
1639 dmz_dev_warn(dev, "Processing zone %u write error (zone wp %u/%u)",
1640 zone->id, zone->wp_block, wp);
1642 if (zone->wp_block < wp) {
1643 dmz_invalidate_blocks(zmd, zone, zone->wp_block,
1644 wp - zone->wp_block);
1651 * Reset a zone write pointer.
1653 static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
1658 * Ignore offline zones, read only zones,
1659 * and conventional zones.
1661 if (dmz_is_offline(zone) ||
1662 dmz_is_readonly(zone) ||
1666 if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) {
1667 struct dmz_dev *dev = zone->dev;
1669 ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET,
1670 dmz_start_sect(zmd, zone),
1671 zmd->zone_nr_sectors, GFP_NOIO);
1673 dmz_dev_err(dev, "Reset zone %u failed %d",
1679 /* Clear write error bit and rewind write pointer position */
1680 clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags);
1686 static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone);
1689 * Initialize chunk mapping.
1691 static int dmz_load_mapping(struct dmz_metadata *zmd)
1693 struct dm_zone *dzone, *bzone;
1694 struct dmz_mblock *dmap_mblk = NULL;
1695 struct dmz_map *dmap;
1696 unsigned int i = 0, e = 0, chunk = 0;
1697 unsigned int dzone_id;
1698 unsigned int bzone_id;
1700 /* Metadata block array for the chunk mapping table */
1701 zmd->map_mblk = kcalloc(zmd->nr_map_blocks,
1702 sizeof(struct dmz_mblk *), GFP_KERNEL);
1706 /* Get chunk mapping table blocks and initialize zone mapping */
1707 while (chunk < zmd->nr_chunks) {
1709 /* Get mapping block */
1710 dmap_mblk = dmz_get_mblock(zmd, i + 1);
1711 if (IS_ERR(dmap_mblk))
1712 return PTR_ERR(dmap_mblk);
1713 zmd->map_mblk[i] = dmap_mblk;
1714 dmap = (struct dmz_map *) dmap_mblk->data;
1719 /* Check data zone */
1720 dzone_id = le32_to_cpu(dmap[e].dzone_id);
1721 if (dzone_id == DMZ_MAP_UNMAPPED)
1724 if (dzone_id >= zmd->nr_zones) {
1725 dmz_zmd_err(zmd, "Chunk %u mapping: invalid data zone ID %u",
1730 dzone = dmz_get(zmd, dzone_id);
1732 dmz_zmd_err(zmd, "Chunk %u mapping: data zone %u not present",
1736 set_bit(DMZ_DATA, &dzone->flags);
1737 dzone->chunk = chunk;
1738 dmz_get_zone_weight(zmd, dzone);
1740 if (dmz_is_cache(dzone))
1741 list_add_tail(&dzone->link, &zmd->map_cache_list);
1742 else if (dmz_is_rnd(dzone))
1743 list_add_tail(&dzone->link, &dzone->dev->map_rnd_list);
1745 list_add_tail(&dzone->link, &dzone->dev->map_seq_list);
1747 /* Check buffer zone */
1748 bzone_id = le32_to_cpu(dmap[e].bzone_id);
1749 if (bzone_id == DMZ_MAP_UNMAPPED)
1752 if (bzone_id >= zmd->nr_zones) {
1753 dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone ID %u",
1758 bzone = dmz_get(zmd, bzone_id);
1760 dmz_zmd_err(zmd, "Chunk %u mapping: buffer zone %u not present",
1764 if (!dmz_is_rnd(bzone) && !dmz_is_cache(bzone)) {
1765 dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone %u",
1770 set_bit(DMZ_DATA, &bzone->flags);
1771 set_bit(DMZ_BUF, &bzone->flags);
1772 bzone->chunk = chunk;
1773 bzone->bzone = dzone;
1774 dzone->bzone = bzone;
1775 dmz_get_zone_weight(zmd, bzone);
1776 if (dmz_is_cache(bzone))
1777 list_add_tail(&bzone->link, &zmd->map_cache_list);
1779 list_add_tail(&bzone->link, &bzone->dev->map_rnd_list);
1783 if (e >= DMZ_MAP_ENTRIES)
1788 * At this point, only meta zones and mapped data zones were
1789 * fully initialized. All remaining zones are unmapped data
1790 * zones. Finish initializing those here.
1792 for (i = 0; i < zmd->nr_zones; i++) {
1793 dzone = dmz_get(zmd, i);
1796 if (dmz_is_meta(dzone))
1798 if (dmz_is_offline(dzone))
1801 if (dmz_is_cache(dzone))
1803 else if (dmz_is_rnd(dzone))
1804 dzone->dev->nr_rnd++;
1806 dzone->dev->nr_seq++;
1808 if (dmz_is_data(dzone)) {
1809 /* Already initialized */
1813 /* Unmapped data zone */
1814 set_bit(DMZ_DATA, &dzone->flags);
1815 dzone->chunk = DMZ_MAP_UNMAPPED;
1816 if (dmz_is_cache(dzone)) {
1817 list_add_tail(&dzone->link, &zmd->unmap_cache_list);
1818 atomic_inc(&zmd->unmap_nr_cache);
1819 } else if (dmz_is_rnd(dzone)) {
1820 list_add_tail(&dzone->link,
1821 &dzone->dev->unmap_rnd_list);
1822 atomic_inc(&dzone->dev->unmap_nr_rnd);
1823 } else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) {
1824 list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list);
1825 set_bit(DMZ_RESERVED, &dzone->flags);
1826 atomic_inc(&zmd->nr_reserved_seq_zones);
1827 dzone->dev->nr_seq--;
1829 list_add_tail(&dzone->link,
1830 &dzone->dev->unmap_seq_list);
1831 atomic_inc(&dzone->dev->unmap_nr_seq);
1839 * Set a data chunk mapping.
1841 static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk,
1842 unsigned int dzone_id, unsigned int bzone_id)
1844 struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT];
1845 struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data;
1846 int map_idx = chunk & DMZ_MAP_ENTRIES_MASK;
1848 dmap[map_idx].dzone_id = cpu_to_le32(dzone_id);
1849 dmap[map_idx].bzone_id = cpu_to_le32(bzone_id);
1850 dmz_dirty_mblock(zmd, dmap_mblk);
1854 * The list of mapped zones is maintained in LRU order.
1855 * This rotates a zone at the end of its map list.
1857 static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
1859 if (list_empty(&zone->link))
1862 list_del_init(&zone->link);
1863 if (dmz_is_seq(zone)) {
1864 /* LRU rotate sequential zone */
1865 list_add_tail(&zone->link, &zone->dev->map_seq_list);
1866 } else if (dmz_is_cache(zone)) {
1867 /* LRU rotate cache zone */
1868 list_add_tail(&zone->link, &zmd->map_cache_list);
1870 /* LRU rotate random zone */
1871 list_add_tail(&zone->link, &zone->dev->map_rnd_list);
1876 * The list of mapped random zones is maintained
1877 * in LRU order. This rotates a zone at the end of the list.
1879 static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
1881 __dmz_lru_zone(zmd, zone);
1883 __dmz_lru_zone(zmd, zone->bzone);
1887 * Wait for any zone to be freed.
1889 static void dmz_wait_for_free_zones(struct dmz_metadata *zmd)
1893 prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE);
1894 dmz_unlock_map(zmd);
1895 dmz_unlock_metadata(zmd);
1897 io_schedule_timeout(HZ);
1899 dmz_lock_metadata(zmd);
1901 finish_wait(&zmd->free_wq, &wait);
1905 * Lock a zone for reclaim (set the zone RECLAIM bit).
1906 * Returns false if the zone cannot be locked or if it is already locked
1909 int dmz_lock_zone_reclaim(struct dm_zone *zone)
1911 /* Active zones cannot be reclaimed */
1912 if (dmz_is_active(zone))
1915 return !test_and_set_bit(DMZ_RECLAIM, &zone->flags);
1919 * Clear a zone reclaim flag.
1921 void dmz_unlock_zone_reclaim(struct dm_zone *zone)
1923 WARN_ON(dmz_is_active(zone));
1924 WARN_ON(!dmz_in_reclaim(zone));
1926 clear_bit_unlock(DMZ_RECLAIM, &zone->flags);
1927 smp_mb__after_atomic();
1928 wake_up_bit(&zone->flags, DMZ_RECLAIM);
1932 * Wait for a zone reclaim to complete.
1934 static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone)
1936 dmz_unlock_map(zmd);
1937 dmz_unlock_metadata(zmd);
1938 set_bit(DMZ_RECLAIM_TERMINATE, &zone->flags);
1939 wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ);
1940 clear_bit(DMZ_RECLAIM_TERMINATE, &zone->flags);
1941 dmz_lock_metadata(zmd);
1946 * Select a cache or random write zone for reclaim.
1948 static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
1949 unsigned int idx, bool idle)
1951 struct dm_zone *dzone = NULL;
1952 struct dm_zone *zone, *last = NULL;
1953 struct list_head *zone_list;
1955 /* If we have cache zones select from the cache zone list */
1956 if (zmd->nr_cache) {
1957 zone_list = &zmd->map_cache_list;
1958 /* Try to relaim random zones, too, when idle */
1959 if (idle && list_empty(zone_list))
1960 zone_list = &zmd->dev[idx].map_rnd_list;
1962 zone_list = &zmd->dev[idx].map_rnd_list;
1964 list_for_each_entry(zone, zone_list, link) {
1965 if (dmz_is_buf(zone)) {
1966 dzone = zone->bzone;
1967 if (dzone->dev->dev_idx != idx)
1973 if (last->weight < dzone->weight)
1978 if (dmz_lock_zone_reclaim(dzone))
1986 * Select a buffered sequential zone for reclaim.
1988 static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd,
1991 struct dm_zone *zone;
1993 list_for_each_entry(zone, &zmd->dev[idx].map_seq_list, link) {
1996 if (dmz_lock_zone_reclaim(zone))
2004 * Select a zone for reclaim.
2006 struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd,
2007 unsigned int dev_idx, bool idle)
2009 struct dm_zone *zone;
2012 * Search for a zone candidate to reclaim: 2 cases are possible.
2013 * (1) There is no free sequential zones. Then a random data zone
2014 * cannot be reclaimed. So choose a sequential zone to reclaim so
2015 * that afterward a random zone can be reclaimed.
2016 * (2) At least one free sequential zone is available, then choose
2017 * the oldest random zone (data or buffer) that can be locked.
2020 if (list_empty(&zmd->reserved_seq_zones_list))
2021 zone = dmz_get_seq_zone_for_reclaim(zmd, dev_idx);
2023 zone = dmz_get_rnd_zone_for_reclaim(zmd, dev_idx, idle);
2024 dmz_unlock_map(zmd);
2030 * Get the zone mapping a chunk, if the chunk is mapped already.
2031 * If no mapping exist and the operation is WRITE, a zone is
2032 * allocated and used to map the chunk.
2033 * The zone returned will be set to the active state.
2035 struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op)
2037 struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT];
2038 struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data;
2039 int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK;
2040 unsigned int dzone_id;
2041 struct dm_zone *dzone = NULL;
2043 int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND;
2047 /* Get the chunk mapping */
2048 dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id);
2049 if (dzone_id == DMZ_MAP_UNMAPPED) {
2051 * Read or discard in unmapped chunks are fine. But for
2052 * writes, we need a mapping, so get one.
2054 if (op != REQ_OP_WRITE)
2057 /* Allocate a random zone */
2058 dzone = dmz_alloc_zone(zmd, 0, alloc_flags);
2060 if (dmz_dev_is_dying(zmd)) {
2061 dzone = ERR_PTR(-EIO);
2064 dmz_wait_for_free_zones(zmd);
2068 dmz_map_zone(zmd, dzone, chunk);
2071 /* The chunk is already mapped: get the mapping zone */
2072 dzone = dmz_get(zmd, dzone_id);
2074 dzone = ERR_PTR(-EIO);
2077 if (dzone->chunk != chunk) {
2078 dzone = ERR_PTR(-EIO);
2082 /* Repair write pointer if the sequential dzone has error */
2083 if (dmz_seq_write_err(dzone)) {
2084 ret = dmz_handle_seq_write_err(zmd, dzone);
2086 dzone = ERR_PTR(-EIO);
2089 clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags);
2094 * If the zone is being reclaimed, the chunk mapping may change
2095 * to a different zone. So wait for reclaim and retry. Otherwise,
2096 * activate the zone (this will prevent reclaim from touching it).
2098 if (dmz_in_reclaim(dzone)) {
2099 dmz_wait_for_reclaim(zmd, dzone);
2102 dmz_activate_zone(dzone);
2103 dmz_lru_zone(zmd, dzone);
2105 dmz_unlock_map(zmd);
2111 * Write and discard change the block validity of data zones and their buffer
2112 * zones. Check here that valid blocks are still present. If all blocks are
2113 * invalid, the zones can be unmapped on the fly without waiting for reclaim
2116 void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone)
2118 struct dm_zone *bzone;
2122 bzone = dzone->bzone;
2124 if (dmz_weight(bzone))
2125 dmz_lru_zone(zmd, bzone);
2127 /* Empty buffer zone: reclaim it */
2128 dmz_unmap_zone(zmd, bzone);
2129 dmz_free_zone(zmd, bzone);
2134 /* Deactivate the data zone */
2135 dmz_deactivate_zone(dzone);
2136 if (dmz_is_active(dzone) || bzone || dmz_weight(dzone))
2137 dmz_lru_zone(zmd, dzone);
2139 /* Unbuffered inactive empty data zone: reclaim it */
2140 dmz_unmap_zone(zmd, dzone);
2141 dmz_free_zone(zmd, dzone);
2144 dmz_unlock_map(zmd);
2148 * Allocate and map a random zone to buffer a chunk
2149 * already mapped to a sequential zone.
2151 struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
2152 struct dm_zone *dzone)
2154 struct dm_zone *bzone;
2155 int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND;
2159 bzone = dzone->bzone;
2163 /* Allocate a random zone */
2164 bzone = dmz_alloc_zone(zmd, 0, alloc_flags);
2166 if (dmz_dev_is_dying(zmd)) {
2167 bzone = ERR_PTR(-EIO);
2170 dmz_wait_for_free_zones(zmd);
2174 /* Update the chunk mapping */
2175 dmz_set_chunk_mapping(zmd, dzone->chunk, dzone->id, bzone->id);
2177 set_bit(DMZ_BUF, &bzone->flags);
2178 bzone->chunk = dzone->chunk;
2179 bzone->bzone = dzone;
2180 dzone->bzone = bzone;
2181 if (dmz_is_cache(bzone))
2182 list_add_tail(&bzone->link, &zmd->map_cache_list);
2184 list_add_tail(&bzone->link, &bzone->dev->map_rnd_list);
2186 dmz_unlock_map(zmd);
2192 * Get an unmapped (free) zone.
2193 * This must be called with the mapping lock held.
2195 struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned int dev_idx,
2196 unsigned long flags)
2198 struct list_head *list;
2199 struct dm_zone *zone;
2203 if (flags & DMZ_ALLOC_CACHE)
2204 list = &zmd->unmap_cache_list;
2205 else if (flags & DMZ_ALLOC_RND)
2206 list = &zmd->dev[dev_idx].unmap_rnd_list;
2208 list = &zmd->dev[dev_idx].unmap_seq_list;
2210 if (list_empty(list)) {
2212 * No free zone: return NULL if this is for not reclaim.
2214 if (!(flags & DMZ_ALLOC_RECLAIM))
2217 * Try to allocate from other devices
2219 if (i < zmd->nr_devs) {
2220 dev_idx = (dev_idx + 1) % zmd->nr_devs;
2226 * Fallback to the reserved sequential zones
2228 zone = list_first_entry_or_null(&zmd->reserved_seq_zones_list,
2229 struct dm_zone, link);
2231 list_del_init(&zone->link);
2232 atomic_dec(&zmd->nr_reserved_seq_zones);
2237 zone = list_first_entry(list, struct dm_zone, link);
2238 list_del_init(&zone->link);
2240 if (dmz_is_cache(zone))
2241 atomic_dec(&zmd->unmap_nr_cache);
2242 else if (dmz_is_rnd(zone))
2243 atomic_dec(&zone->dev->unmap_nr_rnd);
2245 atomic_dec(&zone->dev->unmap_nr_seq);
2247 if (dmz_is_offline(zone)) {
2248 dmz_zmd_warn(zmd, "Zone %u is offline", zone->id);
2252 if (dmz_is_meta(zone)) {
2253 dmz_zmd_warn(zmd, "Zone %u has metadata", zone->id);
2262 * This must be called with the mapping lock held.
2264 void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
2266 /* If this is a sequential zone, reset it */
2267 if (dmz_is_seq(zone))
2268 dmz_reset_zone(zmd, zone);
2270 /* Return the zone to its type unmap list */
2271 if (dmz_is_cache(zone)) {
2272 list_add_tail(&zone->link, &zmd->unmap_cache_list);
2273 atomic_inc(&zmd->unmap_nr_cache);
2274 } else if (dmz_is_rnd(zone)) {
2275 list_add_tail(&zone->link, &zone->dev->unmap_rnd_list);
2276 atomic_inc(&zone->dev->unmap_nr_rnd);
2277 } else if (dmz_is_reserved(zone)) {
2278 list_add_tail(&zone->link, &zmd->reserved_seq_zones_list);
2279 atomic_inc(&zmd->nr_reserved_seq_zones);
2281 list_add_tail(&zone->link, &zone->dev->unmap_seq_list);
2282 atomic_inc(&zone->dev->unmap_nr_seq);
2285 wake_up_all(&zmd->free_wq);
2289 * Map a chunk to a zone.
2290 * This must be called with the mapping lock held.
2292 void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone,
2295 /* Set the chunk mapping */
2296 dmz_set_chunk_mapping(zmd, chunk, dzone->id,
2298 dzone->chunk = chunk;
2299 if (dmz_is_cache(dzone))
2300 list_add_tail(&dzone->link, &zmd->map_cache_list);
2301 else if (dmz_is_rnd(dzone))
2302 list_add_tail(&dzone->link, &dzone->dev->map_rnd_list);
2304 list_add_tail(&dzone->link, &dzone->dev->map_seq_list);
2309 * This must be called with the mapping lock held.
2311 void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
2313 unsigned int chunk = zone->chunk;
2314 unsigned int dzone_id;
2316 if (chunk == DMZ_MAP_UNMAPPED) {
2317 /* Already unmapped */
2321 if (test_and_clear_bit(DMZ_BUF, &zone->flags)) {
2323 * Unmapping the chunk buffer zone: clear only
2324 * the chunk buffer mapping
2326 dzone_id = zone->bzone->id;
2327 zone->bzone->bzone = NULL;
2332 * Unmapping the chunk data zone: the zone must
2335 if (WARN_ON(zone->bzone)) {
2336 zone->bzone->bzone = NULL;
2339 dzone_id = DMZ_MAP_UNMAPPED;
2342 dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED);
2344 zone->chunk = DMZ_MAP_UNMAPPED;
2345 list_del_init(&zone->link);
2349 * Set @nr_bits bits in @bitmap starting from @bit.
2350 * Return the number of bits changed from 0 to 1.
2352 static unsigned int dmz_set_bits(unsigned long *bitmap,
2353 unsigned int bit, unsigned int nr_bits)
2355 unsigned long *addr;
2356 unsigned int end = bit + nr_bits;
2360 if (((bit & (BITS_PER_LONG - 1)) == 0) &&
2361 ((end - bit) >= BITS_PER_LONG)) {
2362 /* Try to set the whole word at once */
2363 addr = bitmap + BIT_WORD(bit);
2367 bit += BITS_PER_LONG;
2372 if (!test_and_set_bit(bit, bitmap))
2381 * Get the bitmap block storing the bit for chunk_block in zone.
2383 static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd,
2384 struct dm_zone *zone,
2385 sector_t chunk_block)
2387 sector_t bitmap_block = 1 + zmd->nr_map_blocks +
2388 (sector_t)(zone->id * zmd->zone_nr_bitmap_blocks) +
2389 (chunk_block >> DMZ_BLOCK_SHIFT_BITS);
2391 return dmz_get_mblock(zmd, bitmap_block);
2395 * Copy the valid blocks bitmap of from_zone to the bitmap of to_zone.
2397 int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
2398 struct dm_zone *to_zone)
2400 struct dmz_mblock *from_mblk, *to_mblk;
2401 sector_t chunk_block = 0;
2403 /* Get the zones bitmap blocks */
2404 while (chunk_block < zmd->zone_nr_blocks) {
2405 from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block);
2406 if (IS_ERR(from_mblk))
2407 return PTR_ERR(from_mblk);
2408 to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block);
2409 if (IS_ERR(to_mblk)) {
2410 dmz_release_mblock(zmd, from_mblk);
2411 return PTR_ERR(to_mblk);
2414 memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE);
2415 dmz_dirty_mblock(zmd, to_mblk);
2417 dmz_release_mblock(zmd, to_mblk);
2418 dmz_release_mblock(zmd, from_mblk);
2420 chunk_block += zmd->zone_bits_per_mblk;
2423 to_zone->weight = from_zone->weight;
2429 * Merge the valid blocks bitmap of from_zone into the bitmap of to_zone,
2430 * starting from chunk_block.
2432 int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
2433 struct dm_zone *to_zone, sector_t chunk_block)
2435 unsigned int nr_blocks;
2438 /* Get the zones bitmap blocks */
2439 while (chunk_block < zmd->zone_nr_blocks) {
2440 /* Get a valid region from the source zone */
2441 ret = dmz_first_valid_block(zmd, from_zone, &chunk_block);
2446 ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks);
2450 chunk_block += nr_blocks;
2457 * Validate all the blocks in the range [block..block+nr_blocks-1].
2459 int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
2460 sector_t chunk_block, unsigned int nr_blocks)
2462 unsigned int count, bit, nr_bits;
2463 unsigned int zone_nr_blocks = zmd->zone_nr_blocks;
2464 struct dmz_mblock *mblk;
2467 dmz_zmd_debug(zmd, "=> VALIDATE zone %u, block %llu, %u blocks",
2468 zone->id, (unsigned long long)chunk_block,
2471 WARN_ON(chunk_block + nr_blocks > zone_nr_blocks);
2474 /* Get bitmap block */
2475 mblk = dmz_get_bitmap(zmd, zone, chunk_block);
2477 return PTR_ERR(mblk);
2480 bit = chunk_block & DMZ_BLOCK_MASK_BITS;
2481 nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
2483 count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits);
2485 dmz_dirty_mblock(zmd, mblk);
2488 dmz_release_mblock(zmd, mblk);
2490 nr_blocks -= nr_bits;
2491 chunk_block += nr_bits;
2494 if (likely(zone->weight + n <= zone_nr_blocks))
2497 dmz_zmd_warn(zmd, "Zone %u: weight %u should be <= %u",
2498 zone->id, zone->weight,
2499 zone_nr_blocks - n);
2500 zone->weight = zone_nr_blocks;
2507 * Clear nr_bits bits in bitmap starting from bit.
2508 * Return the number of bits cleared.
2510 static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits)
2512 unsigned long *addr;
2513 int end = bit + nr_bits;
2517 if (((bit & (BITS_PER_LONG - 1)) == 0) &&
2518 ((end - bit) >= BITS_PER_LONG)) {
2519 /* Try to clear whole word at once */
2520 addr = bitmap + BIT_WORD(bit);
2521 if (*addr == ULONG_MAX) {
2524 bit += BITS_PER_LONG;
2529 if (test_and_clear_bit(bit, bitmap))
2538 * Invalidate all the blocks in the range [block..block+nr_blocks-1].
2540 int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
2541 sector_t chunk_block, unsigned int nr_blocks)
2543 unsigned int count, bit, nr_bits;
2544 struct dmz_mblock *mblk;
2547 dmz_zmd_debug(zmd, "=> INVALIDATE zone %u, block %llu, %u blocks",
2548 zone->id, (u64)chunk_block, nr_blocks);
2550 WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks);
2553 /* Get bitmap block */
2554 mblk = dmz_get_bitmap(zmd, zone, chunk_block);
2556 return PTR_ERR(mblk);
2559 bit = chunk_block & DMZ_BLOCK_MASK_BITS;
2560 nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
2562 count = dmz_clear_bits((unsigned long *)mblk->data,
2565 dmz_dirty_mblock(zmd, mblk);
2568 dmz_release_mblock(zmd, mblk);
2570 nr_blocks -= nr_bits;
2571 chunk_block += nr_bits;
2574 if (zone->weight >= n)
2577 dmz_zmd_warn(zmd, "Zone %u: weight %u should be >= %u",
2578 zone->id, zone->weight, n);
2586 * Get a block bit value.
2588 static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone,
2589 sector_t chunk_block)
2591 struct dmz_mblock *mblk;
2594 WARN_ON(chunk_block >= zmd->zone_nr_blocks);
2596 /* Get bitmap block */
2597 mblk = dmz_get_bitmap(zmd, zone, chunk_block);
2599 return PTR_ERR(mblk);
2602 ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS,
2603 (unsigned long *) mblk->data) != 0;
2605 dmz_release_mblock(zmd, mblk);
2611 * Return the number of blocks from chunk_block to the first block with a bit
2612 * value specified by set. Search at most nr_blocks blocks from chunk_block.
2614 static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone,
2615 sector_t chunk_block, unsigned int nr_blocks,
2618 struct dmz_mblock *mblk;
2619 unsigned int bit, set_bit, nr_bits;
2620 unsigned int zone_bits = zmd->zone_bits_per_mblk;
2621 unsigned long *bitmap;
2624 WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks);
2627 /* Get bitmap block */
2628 mblk = dmz_get_bitmap(zmd, zone, chunk_block);
2630 return PTR_ERR(mblk);
2633 bitmap = (unsigned long *) mblk->data;
2634 bit = chunk_block & DMZ_BLOCK_MASK_BITS;
2635 nr_bits = min(nr_blocks, zone_bits - bit);
2637 set_bit = find_next_bit(bitmap, zone_bits, bit);
2639 set_bit = find_next_zero_bit(bitmap, zone_bits, bit);
2640 dmz_release_mblock(zmd, mblk);
2643 if (set_bit < zone_bits)
2646 nr_blocks -= nr_bits;
2647 chunk_block += nr_bits;
2654 * Test if chunk_block is valid. If it is, the number of consecutive
2655 * valid blocks from chunk_block will be returned.
2657 int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone,
2658 sector_t chunk_block)
2662 valid = dmz_test_block(zmd, zone, chunk_block);
2666 /* The block is valid: get the number of valid blocks from block */
2667 return dmz_to_next_set_block(zmd, zone, chunk_block,
2668 zmd->zone_nr_blocks - chunk_block, 0);
2672 * Find the first valid block from @chunk_block in @zone.
2673 * If such a block is found, its number is returned using
2674 * @chunk_block and the total number of valid blocks from @chunk_block
2677 int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone,
2678 sector_t *chunk_block)
2680 sector_t start_block = *chunk_block;
2683 ret = dmz_to_next_set_block(zmd, zone, start_block,
2684 zmd->zone_nr_blocks - start_block, 1);
2689 *chunk_block = start_block;
2691 return dmz_to_next_set_block(zmd, zone, start_block,
2692 zmd->zone_nr_blocks - start_block, 0);
2696 * Count the number of bits set starting from bit up to bit + nr_bits - 1.
2698 static int dmz_count_bits(void *bitmap, int bit, int nr_bits)
2700 unsigned long *addr;
2701 int end = bit + nr_bits;
2705 if (((bit & (BITS_PER_LONG - 1)) == 0) &&
2706 ((end - bit) >= BITS_PER_LONG)) {
2707 addr = (unsigned long *)bitmap + BIT_WORD(bit);
2708 if (*addr == ULONG_MAX) {
2710 bit += BITS_PER_LONG;
2715 if (test_bit(bit, bitmap))
2724 * Get a zone weight.
2726 static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone)
2728 struct dmz_mblock *mblk;
2729 sector_t chunk_block = 0;
2730 unsigned int bit, nr_bits;
2731 unsigned int nr_blocks = zmd->zone_nr_blocks;
2736 /* Get bitmap block */
2737 mblk = dmz_get_bitmap(zmd, zone, chunk_block);
2743 /* Count bits in this block */
2744 bitmap = mblk->data;
2745 bit = chunk_block & DMZ_BLOCK_MASK_BITS;
2746 nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
2747 n += dmz_count_bits(bitmap, bit, nr_bits);
2749 dmz_release_mblock(zmd, mblk);
2751 nr_blocks -= nr_bits;
2752 chunk_block += nr_bits;
2759 * Cleanup the zoned metadata resources.
2761 static void dmz_cleanup_metadata(struct dmz_metadata *zmd)
2763 struct rb_root *root;
2764 struct dmz_mblock *mblk, *next;
2767 /* Release zone mapping resources */
2768 if (zmd->map_mblk) {
2769 for (i = 0; i < zmd->nr_map_blocks; i++)
2770 dmz_release_mblock(zmd, zmd->map_mblk[i]);
2771 kfree(zmd->map_mblk);
2772 zmd->map_mblk = NULL;
2775 /* Release super blocks */
2776 for (i = 0; i < 2; i++) {
2777 if (zmd->sb[i].mblk) {
2778 dmz_free_mblock(zmd, zmd->sb[i].mblk);
2779 zmd->sb[i].mblk = NULL;
2783 /* Free cached blocks */
2784 while (!list_empty(&zmd->mblk_dirty_list)) {
2785 mblk = list_first_entry(&zmd->mblk_dirty_list,
2786 struct dmz_mblock, link);
2787 dmz_zmd_warn(zmd, "mblock %llu still in dirty list (ref %u)",
2788 (u64)mblk->no, mblk->ref);
2789 list_del_init(&mblk->link);
2790 rb_erase(&mblk->node, &zmd->mblk_rbtree);
2791 dmz_free_mblock(zmd, mblk);
2794 while (!list_empty(&zmd->mblk_lru_list)) {
2795 mblk = list_first_entry(&zmd->mblk_lru_list,
2796 struct dmz_mblock, link);
2797 list_del_init(&mblk->link);
2798 rb_erase(&mblk->node, &zmd->mblk_rbtree);
2799 dmz_free_mblock(zmd, mblk);
2802 /* Sanity checks: the mblock rbtree should now be empty */
2803 root = &zmd->mblk_rbtree;
2804 rbtree_postorder_for_each_entry_safe(mblk, next, root, node) {
2805 dmz_zmd_warn(zmd, "mblock %llu ref %u still in rbtree",
2806 (u64)mblk->no, mblk->ref);
2808 dmz_free_mblock(zmd, mblk);
2811 /* Free the zone descriptors */
2812 dmz_drop_zones(zmd);
2814 mutex_destroy(&zmd->mblk_flush_lock);
2815 mutex_destroy(&zmd->map_lock);
2818 static void dmz_print_dev(struct dmz_metadata *zmd, int num)
2820 struct dmz_dev *dev = &zmd->dev[num];
2822 if (bdev_zoned_model(dev->bdev) == BLK_ZONED_NONE)
2823 dmz_dev_info(dev, "Regular block device");
2825 dmz_dev_info(dev, "Host-%s zoned block device",
2826 bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ?
2827 "aware" : "managed");
2828 if (zmd->sb_version > 1) {
2829 sector_t sector_offset =
2830 dev->zone_offset << zmd->zone_nr_sectors_shift;
2832 dmz_dev_info(dev, " %llu 512-byte logical sectors (offset %llu)",
2833 (u64)dev->capacity, (u64)sector_offset);
2834 dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors (offset %llu)",
2835 dev->nr_zones, (u64)zmd->zone_nr_sectors,
2836 (u64)dev->zone_offset);
2838 dmz_dev_info(dev, " %llu 512-byte logical sectors",
2839 (u64)dev->capacity);
2840 dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors",
2841 dev->nr_zones, (u64)zmd->zone_nr_sectors);
2846 * Initialize the zoned metadata.
2848 int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
2849 struct dmz_metadata **metadata,
2850 const char *devname)
2852 struct dmz_metadata *zmd;
2854 struct dm_zone *zone;
2857 zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL);
2861 strcpy(zmd->devname, devname);
2863 zmd->nr_devs = num_dev;
2864 zmd->mblk_rbtree = RB_ROOT;
2865 init_rwsem(&zmd->mblk_sem);
2866 mutex_init(&zmd->mblk_flush_lock);
2867 spin_lock_init(&zmd->mblk_lock);
2868 INIT_LIST_HEAD(&zmd->mblk_lru_list);
2869 INIT_LIST_HEAD(&zmd->mblk_dirty_list);
2871 mutex_init(&zmd->map_lock);
2873 atomic_set(&zmd->unmap_nr_cache, 0);
2874 INIT_LIST_HEAD(&zmd->unmap_cache_list);
2875 INIT_LIST_HEAD(&zmd->map_cache_list);
2877 atomic_set(&zmd->nr_reserved_seq_zones, 0);
2878 INIT_LIST_HEAD(&zmd->reserved_seq_zones_list);
2880 init_waitqueue_head(&zmd->free_wq);
2882 /* Initialize zone descriptors */
2883 ret = dmz_init_zones(zmd);
2887 /* Get super block */
2888 ret = dmz_load_sb(zmd);
2892 /* Set metadata zones starting from sb_zone */
2893 for (i = 0; i < zmd->nr_meta_zones << 1; i++) {
2894 zone = dmz_get(zmd, zmd->sb[0].zone->id + i);
2897 "metadata zone %u not present", i);
2901 if (!dmz_is_rnd(zone) && !dmz_is_cache(zone)) {
2903 "metadata zone %d is not random", i);
2907 set_bit(DMZ_META, &zone->flags);
2909 /* Load mapping table */
2910 ret = dmz_load_mapping(zmd);
2915 * Cache size boundaries: allow at least 2 super blocks, the chunk map
2916 * blocks and enough blocks to be able to cache the bitmap blocks of
2917 * up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow
2918 * the cache to add 512 more metadata blocks.
2920 zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16;
2921 zmd->max_nr_mblks = zmd->min_nr_mblks + 512;
2922 zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count;
2923 zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan;
2924 zmd->mblk_shrinker.seeks = DEFAULT_SEEKS;
2926 /* Metadata cache shrinker */
2927 ret = register_shrinker(&zmd->mblk_shrinker);
2929 dmz_zmd_err(zmd, "Register metadata cache shrinker failed");
2933 dmz_zmd_info(zmd, "DM-Zoned metadata version %d", zmd->sb_version);
2934 for (i = 0; i < zmd->nr_devs; i++)
2935 dmz_print_dev(zmd, i);
2937 dmz_zmd_info(zmd, " %u zones of %llu 512-byte logical sectors",
2938 zmd->nr_zones, (u64)zmd->zone_nr_sectors);
2939 dmz_zmd_debug(zmd, " %u metadata zones",
2940 zmd->nr_meta_zones * 2);
2941 dmz_zmd_debug(zmd, " %u data zones for %u chunks",
2942 zmd->nr_data_zones, zmd->nr_chunks);
2943 dmz_zmd_debug(zmd, " %u cache zones (%u unmapped)",
2944 zmd->nr_cache, atomic_read(&zmd->unmap_nr_cache));
2945 for (i = 0; i < zmd->nr_devs; i++) {
2946 dmz_zmd_debug(zmd, " %u random zones (%u unmapped)",
2947 dmz_nr_rnd_zones(zmd, i),
2948 dmz_nr_unmap_rnd_zones(zmd, i));
2949 dmz_zmd_debug(zmd, " %u sequential zones (%u unmapped)",
2950 dmz_nr_seq_zones(zmd, i),
2951 dmz_nr_unmap_seq_zones(zmd, i));
2953 dmz_zmd_debug(zmd, " %u reserved sequential data zones",
2954 zmd->nr_reserved_seq);
2955 dmz_zmd_debug(zmd, "Format:");
2956 dmz_zmd_debug(zmd, "%u metadata blocks per set (%u max cache)",
2957 zmd->nr_meta_blocks, zmd->max_nr_mblks);
2958 dmz_zmd_debug(zmd, " %u data zone mapping blocks",
2959 zmd->nr_map_blocks);
2960 dmz_zmd_debug(zmd, " %u bitmap blocks",
2961 zmd->nr_bitmap_blocks);
2967 dmz_cleanup_metadata(zmd);
2975 * Cleanup the zoned metadata resources.
2977 void dmz_dtr_metadata(struct dmz_metadata *zmd)
2979 unregister_shrinker(&zmd->mblk_shrinker);
2980 dmz_cleanup_metadata(zmd);
2985 * Check zone information on resume.
2987 int dmz_resume_metadata(struct dmz_metadata *zmd)
2989 struct dm_zone *zone;
2995 for (i = 0; i < zmd->nr_zones; i++) {
2996 zone = dmz_get(zmd, i);
2998 dmz_zmd_err(zmd, "Unable to get zone %u", i);
3001 wp_block = zone->wp_block;
3003 ret = dmz_update_zone(zmd, zone);
3005 dmz_zmd_err(zmd, "Broken zone %u", i);
3009 if (dmz_is_offline(zone)) {
3010 dmz_zmd_warn(zmd, "Zone %u is offline", i);
3014 /* Check write pointer */
3015 if (!dmz_is_seq(zone))
3017 else if (zone->wp_block != wp_block) {
3018 dmz_zmd_err(zmd, "Zone %u: Invalid wp (%llu / %llu)",
3019 i, (u64)zone->wp_block, (u64)wp_block);
3020 zone->wp_block = wp_block;
3021 dmz_invalidate_blocks(zmd, zone, zone->wp_block,
3022 zmd->zone_nr_blocks - zone->wp_block);