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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 Western Digital Corporation or its affiliates.
4 *
5 * This file is released under the GPL.
6 */
7
8#include "dm-zoned.h"
9
10#include <linux/module.h>
11#include <linux/crc32.h>
12#include <linux/sched/mm.h>
13
14#define DM_MSG_PREFIX "zoned metadata"
15
16/*
17 * Metadata version.
18 */
19#define DMZ_META_VER 2
20
21/*
22 * On-disk super block magic.
23 */
24#define DMZ_MAGIC ((((unsigned int)('D')) << 24) | \
25 (((unsigned int)('Z')) << 16) | \
26 (((unsigned int)('B')) << 8) | \
27 ((unsigned int)('D')))
28
29/*
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.
40 */
41struct dmz_super {
42 /* Magic number */
43 __le32 magic; /* 4 */
44
45 /* Metadata version number */
46 __le32 version; /* 8 */
47
48 /* Generation number */
49 __le64 gen; /* 16 */
50
51 /* This block number */
52 __le64 sb_block; /* 24 */
53
54 /* The number of metadata blocks, including this super block */
55 __le32 nr_meta_blocks; /* 28 */
56
57 /* The number of sequential zones reserved for reclaim */
58 __le32 nr_reserved_seq; /* 32 */
59
60 /* The number of entries in the mapping table */
61 __le32 nr_chunks; /* 36 */
62
63 /* The number of blocks used for the chunk mapping table */
64 __le32 nr_map_blocks; /* 40 */
65
66 /* The number of blocks used for the block bitmaps */
67 __le32 nr_bitmap_blocks; /* 44 */
68
69 /* Checksum */
70 __le32 crc; /* 48 */
71
72 /* DM-Zoned label */
73 u8 dmz_label[32]; /* 80 */
74
75 /* DM-Zoned UUID */
76 u8 dmz_uuid[16]; /* 96 */
77
78 /* Device UUID */
79 u8 dev_uuid[16]; /* 112 */
80
81 /* Padding to full 512B sector */
82 u8 reserved[400]; /* 512 */
83};
84
85/*
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
91 * writeable zone.
92 */
93struct dmz_map {
94 __le32 dzone_id;
95 __le32 bzone_id;
96};
97
98/*
99 * Chunk mapping table metadata: 512 8-bytes entries per 4KB block.
100 */
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
105
106/*
107 * Meta data block descriptor (for cached metadata blocks).
108 */
109struct dmz_mblock {
110 struct rb_node node;
111 struct list_head link;
112 sector_t no;
113 unsigned int ref;
114 unsigned long state;
115 struct page *page;
116 void *data;
117};
118
119/*
120 * Metadata block state flags.
121 */
122enum {
123 DMZ_META_DIRTY,
124 DMZ_META_READING,
125 DMZ_META_WRITING,
126 DMZ_META_ERROR,
127};
128
129/*
130 * Super block information (one per metadata set).
131 */
132struct dmz_sb {
133 sector_t block;
134 struct dmz_dev *dev;
135 struct dmz_mblock *mblk;
136 struct dmz_super *sb;
137 struct dm_zone *zone;
138};
139
140/*
141 * In-memory metadata.
142 */
143struct dmz_metadata {
144 struct dmz_dev *dev;
145 unsigned int nr_devs;
146
147 char devname[BDEVNAME_SIZE];
148 char label[BDEVNAME_SIZE];
149 uuid_t uuid;
150
151 sector_t zone_bitmap_size;
152 unsigned int zone_nr_bitmap_blocks;
153 unsigned int zone_bits_per_mblk;
154
155 sector_t zone_nr_blocks;
156 sector_t zone_nr_blocks_shift;
157
158 sector_t zone_nr_sectors;
159 sector_t zone_nr_sectors_shift;
160
161 unsigned int nr_bitmap_blocks;
162 unsigned int nr_map_blocks;
163
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;
173
174 /* Zone information array */
175 struct xarray zones;
176
177 struct dmz_sb sb[2];
178 unsigned int mblk_primary;
179 unsigned int sb_version;
180 u64 sb_gen;
181 unsigned int min_nr_mblks;
182 unsigned int max_nr_mblks;
183 atomic_t 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;
191
192 /* Zone allocation management */
193 struct mutex map_lock;
194 struct dmz_mblock **map_mblk;
195
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;
200
201 atomic_t nr_reserved_seq_zones;
202 struct list_head reserved_seq_zones_list;
203
204 wait_queue_head_t free_wq;
205};
206
207#define dmz_zmd_info(zmd, format, args...) \
208 DMINFO("(%s): " format, (zmd)->label, ## args)
209
210#define dmz_zmd_err(zmd, format, args...) \
211 DMERR("(%s): " format, (zmd)->label, ## args)
212
213#define dmz_zmd_warn(zmd, format, args...) \
214 DMWARN("(%s): " format, (zmd)->label, ## args)
215
216#define dmz_zmd_debug(zmd, format, args...) \
217 DMDEBUG("(%s): " format, (zmd)->label, ## args)
218/*
219 * Various accessors
220 */
221static unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone)
222{
223 if (WARN_ON(!zone))
224 return 0;
225
226 return zone->id - zone->dev->zone_offset;
227}
228
229sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone)
230{
231 unsigned int zone_id = dmz_dev_zone_id(zmd, zone);
232
233 return (sector_t)zone_id << zmd->zone_nr_sectors_shift;
234}
235
236sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone)
237{
238 unsigned int zone_id = dmz_dev_zone_id(zmd, zone);
239
240 return (sector_t)zone_id << zmd->zone_nr_blocks_shift;
241}
242
243unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd)
244{
245 return zmd->zone_nr_blocks;
246}
247
248unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd)
249{
250 return zmd->zone_nr_blocks_shift;
251}
252
253unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd)
254{
255 return zmd->zone_nr_sectors;
256}
257
258unsigned int dmz_zone_nr_sectors_shift(struct dmz_metadata *zmd)
259{
260 return zmd->zone_nr_sectors_shift;
261}
262
263unsigned int dmz_nr_zones(struct dmz_metadata *zmd)
264{
265 return zmd->nr_zones;
266}
267
268unsigned int dmz_nr_chunks(struct dmz_metadata *zmd)
269{
270 return zmd->nr_chunks;
271}
272
273unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd, int idx)
274{
275 return zmd->dev[idx].nr_rnd;
276}
277
278unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd, int idx)
279{
280 return atomic_read(&zmd->dev[idx].unmap_nr_rnd);
281}
282
283unsigned int dmz_nr_cache_zones(struct dmz_metadata *zmd)
284{
285 return zmd->nr_cache;
286}
287
288unsigned int dmz_nr_unmap_cache_zones(struct dmz_metadata *zmd)
289{
290 return atomic_read(&zmd->unmap_nr_cache);
291}
292
293unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd, int idx)
294{
295 return zmd->dev[idx].nr_seq;
296}
297
298unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd, int idx)
299{
300 return atomic_read(&zmd->dev[idx].unmap_nr_seq);
301}
302
303static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id)
304{
305 return xa_load(&zmd->zones, zone_id);
306}
307
308static struct dm_zone *dmz_insert(struct dmz_metadata *zmd,
309 unsigned int zone_id, struct dmz_dev *dev)
310{
311 struct dm_zone *zone = kzalloc(sizeof(struct dm_zone), GFP_KERNEL);
312
313 if (!zone)
314 return ERR_PTR(-ENOMEM);
315
316 if (xa_insert(&zmd->zones, zone_id, zone, GFP_KERNEL)) {
317 kfree(zone);
318 return ERR_PTR(-EBUSY);
319 }
320
321 INIT_LIST_HEAD(&zone->link);
322 atomic_set(&zone->refcount, 0);
323 zone->id = zone_id;
324 zone->chunk = DMZ_MAP_UNMAPPED;
325 zone->dev = dev;
326
327 return zone;
328}
329
330const char *dmz_metadata_label(struct dmz_metadata *zmd)
331{
332 return (const char *)zmd->label;
333}
334
335bool dmz_check_dev(struct dmz_metadata *zmd)
336{
337 unsigned int i;
338
339 for (i = 0; i < zmd->nr_devs; i++) {
340 if (!dmz_check_bdev(&zmd->dev[i]))
341 return false;
342 }
343 return true;
344}
345
346bool dmz_dev_is_dying(struct dmz_metadata *zmd)
347{
348 unsigned int i;
349
350 for (i = 0; i < zmd->nr_devs; i++) {
351 if (dmz_bdev_is_dying(&zmd->dev[i]))
352 return true;
353 }
354 return false;
355}
356
357/*
358 * Lock/unlock mapping table.
359 * The map lock also protects all the zone lists.
360 */
361void dmz_lock_map(struct dmz_metadata *zmd)
362{
363 mutex_lock(&zmd->map_lock);
364}
365
366void dmz_unlock_map(struct dmz_metadata *zmd)
367{
368 mutex_unlock(&zmd->map_lock);
369}
370
371/*
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).
377 */
378void dmz_lock_metadata(struct dmz_metadata *zmd)
379{
380 down_read(&zmd->mblk_sem);
381}
382
383void dmz_unlock_metadata(struct dmz_metadata *zmd)
384{
385 up_read(&zmd->mblk_sem);
386}
387
388/*
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.
392 */
393void dmz_lock_flush(struct dmz_metadata *zmd)
394{
395 mutex_lock(&zmd->mblk_flush_lock);
396}
397
398void dmz_unlock_flush(struct dmz_metadata *zmd)
399{
400 mutex_unlock(&zmd->mblk_flush_lock);
401}
402
403/*
404 * Allocate a metadata block.
405 */
406static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd,
407 sector_t mblk_no)
408{
409 struct dmz_mblock *mblk = NULL;
410
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);
416 if (mblk) {
417 list_del_init(&mblk->link);
418 rb_erase(&mblk->node, &zmd->mblk_rbtree);
419 mblk->no = mblk_no;
420 }
421 spin_unlock(&zmd->mblk_lock);
422 if (mblk)
423 return mblk;
424 }
425
426 /* Allocate a new block */
427 mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO);
428 if (!mblk)
429 return NULL;
430
431 mblk->page = alloc_page(GFP_NOIO);
432 if (!mblk->page) {
433 kfree(mblk);
434 return NULL;
435 }
436
437 RB_CLEAR_NODE(&mblk->node);
438 INIT_LIST_HEAD(&mblk->link);
439 mblk->ref = 0;
440 mblk->state = 0;
441 mblk->no = mblk_no;
442 mblk->data = page_address(mblk->page);
443
444 atomic_inc(&zmd->nr_mblks);
445
446 return mblk;
447}
448
449/*
450 * Free a metadata block.
451 */
452static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk)
453{
454 __free_pages(mblk->page, 0);
455 kfree(mblk);
456
457 atomic_dec(&zmd->nr_mblks);
458}
459
460/*
461 * Insert a metadata block in the rbtree.
462 */
463static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk)
464{
465 struct rb_root *root = &zmd->mblk_rbtree;
466 struct rb_node **new = &(root->rb_node), *parent = NULL;
467 struct dmz_mblock *b;
468
469 /* Figure out where to put the new node */
470 while (*new) {
471 b = container_of(*new, struct dmz_mblock, node);
472 parent = *new;
473 new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right);
474 }
475
476 /* Add new node and rebalance tree */
477 rb_link_node(&mblk->node, parent, new);
478 rb_insert_color(&mblk->node, root);
479}
480
481/*
482 * Lookup a metadata block in the rbtree. If the block is found, increment
483 * its reference count.
484 */
485static struct dmz_mblock *dmz_get_mblock_fast(struct dmz_metadata *zmd,
486 sector_t mblk_no)
487{
488 struct rb_root *root = &zmd->mblk_rbtree;
489 struct rb_node *node = root->rb_node;
490 struct dmz_mblock *mblk;
491
492 while (node) {
493 mblk = container_of(node, struct dmz_mblock, node);
494 if (mblk->no == mblk_no) {
495 /*
496 * If this is the first reference to the block,
497 * remove it from the LRU list.
498 */
499 mblk->ref++;
500 if (mblk->ref == 1 &&
501 !test_bit(DMZ_META_DIRTY, &mblk->state))
502 list_del_init(&mblk->link);
503 return mblk;
504 }
505 node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right;
506 }
507
508 return NULL;
509}
510
511/*
512 * Metadata block BIO end callback.
513 */
514static void dmz_mblock_bio_end_io(struct bio *bio)
515{
516 struct dmz_mblock *mblk = bio->bi_private;
517 int flag;
518
519 if (bio->bi_status)
520 set_bit(DMZ_META_ERROR, &mblk->state);
521
522 if (bio_op(bio) == REQ_OP_WRITE)
523 flag = DMZ_META_WRITING;
524 else
525 flag = DMZ_META_READING;
526
527 clear_bit_unlock(flag, &mblk->state);
528 smp_mb__after_atomic();
529 wake_up_bit(&mblk->state, flag);
530
531 bio_put(bio);
532}
533
534/*
535 * Read an uncached metadata block from disk and add it to the cache.
536 */
537static struct dmz_mblock *dmz_get_mblock_slow(struct dmz_metadata *zmd,
538 sector_t mblk_no)
539{
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;
543 struct bio *bio;
544
545 if (dmz_bdev_is_dying(dev))
546 return ERR_PTR(-EIO);
547
548 /* Get a new block and a BIO to read it */
549 mblk = dmz_alloc_mblock(zmd, mblk_no);
550 if (!mblk)
551 return ERR_PTR(-ENOMEM);
552
553 bio = bio_alloc(GFP_NOIO, 1);
554 if (!bio) {
555 dmz_free_mblock(zmd, mblk);
556 return ERR_PTR(-ENOMEM);
557 }
558
559 spin_lock(&zmd->mblk_lock);
560
561 /*
562 * Make sure that another context did not start reading
563 * the block already.
564 */
565 m = dmz_get_mblock_fast(zmd, mblk_no);
566 if (m) {
567 spin_unlock(&zmd->mblk_lock);
568 dmz_free_mblock(zmd, mblk);
569 bio_put(bio);
570 return m;
571 }
572
573 mblk->ref++;
574 set_bit(DMZ_META_READING, &mblk->state);
575 dmz_insert_mblock(zmd, mblk);
576
577 spin_unlock(&zmd->mblk_lock);
578
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);
586 submit_bio(bio);
587
588 return mblk;
589}
590
591/*
592 * Free metadata blocks.
593 */
594static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd,
595 unsigned long limit)
596{
597 struct dmz_mblock *mblk;
598 unsigned long count = 0;
599
600 if (!zmd->max_nr_mblks)
601 return 0;
602
603 while (!list_empty(&zmd->mblk_lru_list) &&
604 atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks &&
605 count < limit) {
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);
611 count++;
612 }
613
614 return count;
615}
616
617/*
618 * For mblock shrinker: get the number of unused metadata blocks in the cache.
619 */
620static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink,
621 struct shrink_control *sc)
622{
623 struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker);
624
625 return atomic_read(&zmd->nr_mblks);
626}
627
628/*
629 * For mblock shrinker: scan unused metadata blocks and shrink the cache.
630 */
631static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink,
632 struct shrink_control *sc)
633{
634 struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker);
635 unsigned long count;
636
637 spin_lock(&zmd->mblk_lock);
638 count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan);
639 spin_unlock(&zmd->mblk_lock);
640
641 return count ? count : SHRINK_STOP;
642}
643
644/*
645 * Release a metadata block.
646 */
647static void dmz_release_mblock(struct dmz_metadata *zmd,
648 struct dmz_mblock *mblk)
649{
650
651 if (!mblk)
652 return;
653
654 spin_lock(&zmd->mblk_lock);
655
656 mblk->ref--;
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);
664 }
665 }
666
667 spin_unlock(&zmd->mblk_lock);
668}
669
670/*
671 * Get a metadata block from the rbtree. If the block
672 * is not present, read it from disk.
673 */
674static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd,
675 sector_t mblk_no)
676{
677 struct dmz_mblock *mblk;
678 struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev;
679
680 /* Check rbtree */
681 spin_lock(&zmd->mblk_lock);
682 mblk = dmz_get_mblock_fast(zmd, mblk_no);
683 spin_unlock(&zmd->mblk_lock);
684
685 if (!mblk) {
686 /* Cache miss: read the block from disk */
687 mblk = dmz_get_mblock_slow(zmd, mblk_no);
688 if (IS_ERR(mblk))
689 return mblk;
690 }
691
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);
697 dmz_check_bdev(dev);
698 return ERR_PTR(-EIO);
699 }
700
701 return mblk;
702}
703
704/*
705 * Mark a metadata block dirty.
706 */
707static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk)
708{
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);
713}
714
715/*
716 * Issue a metadata block write BIO.
717 */
718static int dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk,
719 unsigned int set)
720{
721 struct dmz_dev *dev = zmd->sb[set].dev;
722 sector_t block = zmd->sb[set].block + mblk->no;
723 struct bio *bio;
724
725 if (dmz_bdev_is_dying(dev))
726 return -EIO;
727
728 bio = bio_alloc(GFP_NOIO, 1);
729 if (!bio) {
730 set_bit(DMZ_META_ERROR, &mblk->state);
731 return -ENOMEM;
732 }
733
734 set_bit(DMZ_META_WRITING, &mblk->state);
735
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);
742 submit_bio(bio);
743
744 return 0;
745}
746
747/*
748 * Read/write a metadata block.
749 */
750static int dmz_rdwr_block(struct dmz_dev *dev, int op,
751 sector_t block, struct page *page)
752{
753 struct bio *bio;
754 int ret;
755
756 if (WARN_ON(!dev))
757 return -EIO;
758
759 if (dmz_bdev_is_dying(dev))
760 return -EIO;
761
762 bio = bio_alloc(GFP_NOIO, 1);
763 if (!bio)
764 return -ENOMEM;
765
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);
771 bio_put(bio);
772
773 if (ret)
774 dmz_check_bdev(dev);
775 return ret;
776}
777
778/*
779 * Write super block of the specified metadata set.
780 */
781static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set)
782{
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;
786 sector_t sb_block;
787 u64 sb_gen = zmd->sb_gen + 1;
788 int ret;
789
790 sb->magic = cpu_to_le32(DMZ_MAGIC);
791
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);
798 }
799
800 sb->gen = cpu_to_le64(sb_gen);
801
802 /*
803 * The metadata always references the absolute block address,
804 * ie relative to the entire block range, not the per-device
805 * block address.
806 */
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);
812
813 sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks);
814 sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks);
815
816 sb->crc = 0;
817 sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE));
818
819 ret = dmz_rdwr_block(dev, REQ_OP_WRITE, zmd->sb[set].block,
820 mblk->page);
821 if (ret == 0)
822 ret = blkdev_issue_flush(dev->bdev);
823
824 return ret;
825}
826
827/*
828 * Write dirty metadata blocks to the specified set.
829 */
830static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd,
831 struct list_head *write_list,
832 unsigned int set)
833{
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;
838
839 /* Issue writes */
840 blk_start_plug(&plug);
841 list_for_each_entry(mblk, write_list, link) {
842 ret = dmz_write_mblock(zmd, mblk, set);
843 if (ret)
844 break;
845 nr_mblks_submitted++;
846 }
847 blk_finish_plug(&plug);
848
849 /* Wait for completion */
850 list_for_each_entry(mblk, write_list, link) {
851 if (!nr_mblks_submitted)
852 break;
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);
857 dmz_check_bdev(dev);
858 ret = -EIO;
859 }
860 nr_mblks_submitted--;
861 }
862
863 /* Flush drive cache (this will also sync data) */
864 if (ret == 0)
865 ret = blkdev_issue_flush(dev->bdev);
866
867 return ret;
868}
869
870/*
871 * Log dirty metadata blocks.
872 */
873static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd,
874 struct list_head *write_list)
875{
876 unsigned int log_set = zmd->mblk_primary ^ 0x1;
877 int ret;
878
879 /* Write dirty blocks to the log */
880 ret = dmz_write_dirty_mblocks(zmd, write_list, log_set);
881 if (ret)
882 return ret;
883
884 /*
885 * No error so far: now validate the log by updating the
886 * log index super block generation.
887 */
888 ret = dmz_write_sb(zmd, log_set);
889 if (ret)
890 return ret;
891
892 return 0;
893}
894
895/*
896 * Flush dirty metadata blocks.
897 */
898int dmz_flush_metadata(struct dmz_metadata *zmd)
899{
900 struct dmz_mblock *mblk;
901 struct list_head write_list;
902 struct dmz_dev *dev;
903 int ret;
904
905 if (WARN_ON(!zmd))
906 return 0;
907
908 INIT_LIST_HEAD(&write_list);
909
910 /*
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.
914 */
915 down_write(&zmd->mblk_sem);
916 dev = zmd->sb[zmd->mblk_primary].dev;
917
918 /*
919 * This is called from the target flush work and reclaim work.
920 * Concurrent execution is not allowed.
921 */
922 dmz_lock_flush(zmd);
923
924 if (dmz_bdev_is_dying(dev)) {
925 ret = -EIO;
926 goto out;
927 }
928
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);
933
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);
937 goto err;
938 }
939
940 /*
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.
944 */
945 ret = dmz_log_dirty_mblocks(zmd, &write_list);
946 if (ret)
947 goto err;
948
949 /*
950 * The log is on disk. It is now safe to update in place
951 * in the primary metadata set.
952 */
953 ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary);
954 if (ret)
955 goto err;
956
957 ret = dmz_write_sb(zmd, zmd->mblk_primary);
958 if (ret)
959 goto err;
960
961 while (!list_empty(&write_list)) {
962 mblk = list_first_entry(&write_list, struct dmz_mblock, link);
963 list_del_init(&mblk->link);
964
965 spin_lock(&zmd->mblk_lock);
966 clear_bit(DMZ_META_DIRTY, &mblk->state);
967 if (mblk->ref == 0)
968 list_add_tail(&mblk->link, &zmd->mblk_lru_list);
969 spin_unlock(&zmd->mblk_lock);
970 }
971
972 zmd->sb_gen++;
973out:
974 dmz_unlock_flush(zmd);
975 up_write(&zmd->mblk_sem);
976
977 return ret;
978
979err:
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);
984 }
985 if (!dmz_check_bdev(dev))
986 ret = -EIO;
987 goto out;
988}
989
990/*
991 * Check super block.
992 */
993static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_sb *dsb,
994 bool tertiary)
995{
996 struct dmz_super *sb = dsb->sb;
997 struct dmz_dev *dev = dsb->dev;
998 unsigned int nr_meta_zones, nr_data_zones;
999 u32 crc, stored_crc;
1000 u64 gen, sb_block;
1001
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));
1005 return -ENXIO;
1006 }
1007
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);
1012 return -EINVAL;
1013 }
1014 if (zmd->sb_version < 2 && tertiary) {
1015 dmz_dev_err(dev, "Tertiary superblocks are not supported");
1016 return -EINVAL;
1017 }
1018
1019 gen = le64_to_cpu(sb->gen);
1020 stored_crc = le32_to_cpu(sb->crc);
1021 sb->crc = 0;
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)",
1025 crc, stored_crc);
1026 return -ENXIO;
1027 }
1028
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)",
1033 sb_block,
1034 (u64)dsb->zone->id << zmd->zone_nr_blocks_shift);
1035 return -EINVAL;
1036 }
1037 if (zmd->sb_version > 1) {
1038 uuid_t sb_uuid;
1039
1040 import_uuid(&sb_uuid, sb->dmz_uuid);
1041 if (uuid_is_null(&sb_uuid)) {
1042 dmz_dev_err(dev, "NULL DM-Zoned uuid");
1043 return -ENXIO;
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);
1050 return -ENXIO;
1051 }
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);
1058 return -ENXIO;
1059 }
1060 import_uuid(&dev->uuid, sb->dev_uuid);
1061 if (uuid_is_null(&dev->uuid)) {
1062 dmz_dev_err(dev, "NULL device uuid");
1063 return -ENXIO;
1064 }
1065
1066 if (tertiary) {
1067 /*
1068 * Generation number should be 0, but it doesn't
1069 * really matter if it isn't.
1070 */
1071 if (gen != 0)
1072 dmz_dev_warn(dev, "Invalid generation %llu",
1073 gen);
1074 return 0;
1075 }
1076 }
1077
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 (zmd->nr_devs <= 1 && nr_meta_zones >= zmd->nr_rnd_zones) ||
1082 (zmd->nr_devs > 1 && nr_meta_zones >= zmd->nr_cache_zones)) {
1083 dmz_dev_err(dev, "Invalid number of metadata blocks");
1084 return -ENXIO;
1085 }
1086
1087 if (!le32_to_cpu(sb->nr_reserved_seq) ||
1088 le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) {
1089 dmz_dev_err(dev, "Invalid number of reserved sequential zones");
1090 return -ENXIO;
1091 }
1092
1093 nr_data_zones = zmd->nr_useable_zones -
1094 (nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq));
1095 if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) {
1096 dmz_dev_err(dev, "Invalid number of chunks %u / %u",
1097 le32_to_cpu(sb->nr_chunks), nr_data_zones);
1098 return -ENXIO;
1099 }
1100
1101 /* OK */
1102 zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks);
1103 zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq);
1104 zmd->nr_chunks = le32_to_cpu(sb->nr_chunks);
1105 zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks);
1106 zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks);
1107 zmd->nr_meta_zones = nr_meta_zones;
1108 zmd->nr_data_zones = nr_data_zones;
1109
1110 return 0;
1111}
1112
1113/*
1114 * Read the first or second super block from disk.
1115 */
1116static int dmz_read_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set)
1117{
1118 dmz_zmd_debug(zmd, "read superblock set %d dev %s block %llu",
1119 set, sb->dev->name, sb->block);
1120
1121 return dmz_rdwr_block(sb->dev, REQ_OP_READ,
1122 sb->block, sb->mblk->page);
1123}
1124
1125/*
1126 * Determine the position of the secondary super blocks on disk.
1127 * This is used only if a corruption of the primary super block
1128 * is detected.
1129 */
1130static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd)
1131{
1132 unsigned int zone_nr_blocks = zmd->zone_nr_blocks;
1133 struct dmz_mblock *mblk;
1134 unsigned int zone_id = zmd->sb[0].zone->id;
1135 int i;
1136
1137 /* Allocate a block */
1138 mblk = dmz_alloc_mblock(zmd, 0);
1139 if (!mblk)
1140 return -ENOMEM;
1141
1142 zmd->sb[1].mblk = mblk;
1143 zmd->sb[1].sb = mblk->data;
1144
1145 /* Bad first super block: search for the second one */
1146 zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks;
1147 zmd->sb[1].zone = dmz_get(zmd, zone_id + 1);
1148 zmd->sb[1].dev = zmd->sb[0].dev;
1149 for (i = 1; i < zmd->nr_rnd_zones; i++) {
1150 if (dmz_read_sb(zmd, &zmd->sb[1], 1) != 0)
1151 break;
1152 if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC)
1153 return 0;
1154 zmd->sb[1].block += zone_nr_blocks;
1155 zmd->sb[1].zone = dmz_get(zmd, zone_id + i);
1156 }
1157
1158 dmz_free_mblock(zmd, mblk);
1159 zmd->sb[1].mblk = NULL;
1160 zmd->sb[1].zone = NULL;
1161 zmd->sb[1].dev = NULL;
1162
1163 return -EIO;
1164}
1165
1166/*
1167 * Read a super block from disk.
1168 */
1169static int dmz_get_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set)
1170{
1171 struct dmz_mblock *mblk;
1172 int ret;
1173
1174 /* Allocate a block */
1175 mblk = dmz_alloc_mblock(zmd, 0);
1176 if (!mblk)
1177 return -ENOMEM;
1178
1179 sb->mblk = mblk;
1180 sb->sb = mblk->data;
1181
1182 /* Read super block */
1183 ret = dmz_read_sb(zmd, sb, set);
1184 if (ret) {
1185 dmz_free_mblock(zmd, mblk);
1186 sb->mblk = NULL;
1187 return ret;
1188 }
1189
1190 return 0;
1191}
1192
1193/*
1194 * Recover a metadata set.
1195 */
1196static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set)
1197{
1198 unsigned int src_set = dst_set ^ 0x1;
1199 struct page *page;
1200 int i, ret;
1201
1202 dmz_dev_warn(zmd->sb[dst_set].dev,
1203 "Metadata set %u invalid: recovering", dst_set);
1204
1205 if (dst_set == 0)
1206 zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
1207 else
1208 zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
1209
1210 page = alloc_page(GFP_NOIO);
1211 if (!page)
1212 return -ENOMEM;
1213
1214 /* Copy metadata blocks */
1215 for (i = 1; i < zmd->nr_meta_blocks; i++) {
1216 ret = dmz_rdwr_block(zmd->sb[src_set].dev, REQ_OP_READ,
1217 zmd->sb[src_set].block + i, page);
1218 if (ret)
1219 goto out;
1220 ret = dmz_rdwr_block(zmd->sb[dst_set].dev, REQ_OP_WRITE,
1221 zmd->sb[dst_set].block + i, page);
1222 if (ret)
1223 goto out;
1224 }
1225
1226 /* Finalize with the super block */
1227 if (!zmd->sb[dst_set].mblk) {
1228 zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0);
1229 if (!zmd->sb[dst_set].mblk) {
1230 ret = -ENOMEM;
1231 goto out;
1232 }
1233 zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data;
1234 }
1235
1236 ret = dmz_write_sb(zmd, dst_set);
1237out:
1238 __free_pages(page, 0);
1239
1240 return ret;
1241}
1242
1243/*
1244 * Get super block from disk.
1245 */
1246static int dmz_load_sb(struct dmz_metadata *zmd)
1247{
1248 bool sb_good[2] = {false, false};
1249 u64 sb_gen[2] = {0, 0};
1250 int ret;
1251
1252 if (!zmd->sb[0].zone) {
1253 dmz_zmd_err(zmd, "Primary super block zone not set");
1254 return -ENXIO;
1255 }
1256
1257 /* Read and check the primary super block */
1258 zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
1259 zmd->sb[0].dev = zmd->sb[0].zone->dev;
1260 ret = dmz_get_sb(zmd, &zmd->sb[0], 0);
1261 if (ret) {
1262 dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed");
1263 return ret;
1264 }
1265
1266 ret = dmz_check_sb(zmd, &zmd->sb[0], false);
1267
1268 /* Read and check secondary super block */
1269 if (ret == 0) {
1270 sb_good[0] = true;
1271 if (!zmd->sb[1].zone) {
1272 unsigned int zone_id =
1273 zmd->sb[0].zone->id + zmd->nr_meta_zones;
1274
1275 zmd->sb[1].zone = dmz_get(zmd, zone_id);
1276 }
1277 zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
1278 zmd->sb[1].dev = zmd->sb[0].dev;
1279 ret = dmz_get_sb(zmd, &zmd->sb[1], 1);
1280 } else
1281 ret = dmz_lookup_secondary_sb(zmd);
1282
1283 if (ret) {
1284 dmz_dev_err(zmd->sb[1].dev, "Read secondary super block failed");
1285 return ret;
1286 }
1287
1288 ret = dmz_check_sb(zmd, &zmd->sb[1], false);
1289 if (ret == 0)
1290 sb_good[1] = true;
1291
1292 /* Use highest generation sb first */
1293 if (!sb_good[0] && !sb_good[1]) {
1294 dmz_zmd_err(zmd, "No valid super block found");
1295 return -EIO;
1296 }
1297
1298 if (sb_good[0])
1299 sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen);
1300 else {
1301 ret = dmz_recover_mblocks(zmd, 0);
1302 if (ret) {
1303 dmz_dev_err(zmd->sb[0].dev,
1304 "Recovery of superblock 0 failed");
1305 return -EIO;
1306 }
1307 }
1308
1309 if (sb_good[1])
1310 sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen);
1311 else {
1312 ret = dmz_recover_mblocks(zmd, 1);
1313
1314 if (ret) {
1315 dmz_dev_err(zmd->sb[1].dev,
1316 "Recovery of superblock 1 failed");
1317 return -EIO;
1318 }
1319 }
1320
1321 if (sb_gen[0] >= sb_gen[1]) {
1322 zmd->sb_gen = sb_gen[0];
1323 zmd->mblk_primary = 0;
1324 } else {
1325 zmd->sb_gen = sb_gen[1];
1326 zmd->mblk_primary = 1;
1327 }
1328
1329 dmz_dev_debug(zmd->sb[zmd->mblk_primary].dev,
1330 "Using super block %u (gen %llu)",
1331 zmd->mblk_primary, zmd->sb_gen);
1332
1333 if (zmd->sb_version > 1) {
1334 int i;
1335 struct dmz_sb *sb;
1336
1337 sb = kzalloc(sizeof(struct dmz_sb), GFP_KERNEL);
1338 if (!sb)
1339 return -ENOMEM;
1340 for (i = 1; i < zmd->nr_devs; i++) {
1341 sb->block = 0;
1342 sb->zone = dmz_get(zmd, zmd->dev[i].zone_offset);
1343 sb->dev = &zmd->dev[i];
1344 if (!dmz_is_meta(sb->zone)) {
1345 dmz_dev_err(sb->dev,
1346 "Tertiary super block zone %u not marked as metadata zone",
1347 sb->zone->id);
1348 ret = -EINVAL;
1349 goto out_kfree;
1350 }
1351 ret = dmz_get_sb(zmd, sb, i + 1);
1352 if (ret) {
1353 dmz_dev_err(sb->dev,
1354 "Read tertiary super block failed");
1355 dmz_free_mblock(zmd, sb->mblk);
1356 goto out_kfree;
1357 }
1358 ret = dmz_check_sb(zmd, sb, true);
1359 dmz_free_mblock(zmd, sb->mblk);
1360 if (ret == -EINVAL)
1361 goto out_kfree;
1362 }
1363 out_kfree:
1364 kfree(sb);
1365 }
1366 return ret;
1367}
1368
1369/*
1370 * Initialize a zone descriptor.
1371 */
1372static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
1373{
1374 struct dmz_dev *dev = data;
1375 struct dmz_metadata *zmd = dev->metadata;
1376 int idx = num + dev->zone_offset;
1377 struct dm_zone *zone;
1378
1379 zone = dmz_insert(zmd, idx, dev);
1380 if (IS_ERR(zone))
1381 return PTR_ERR(zone);
1382
1383 if (blkz->len != zmd->zone_nr_sectors) {
1384 if (zmd->sb_version > 1) {
1385 /* Ignore the eventual runt (smaller) zone */
1386 set_bit(DMZ_OFFLINE, &zone->flags);
1387 return 0;
1388 } else if (blkz->start + blkz->len == dev->capacity)
1389 return 0;
1390 return -ENXIO;
1391 }
1392
1393 /*
1394 * Devices that have zones with a capacity smaller than the zone size
1395 * (e.g. NVMe zoned namespaces) are not supported.
1396 */
1397 if (blkz->capacity != blkz->len)
1398 return -ENXIO;
1399
1400 switch (blkz->type) {
1401 case BLK_ZONE_TYPE_CONVENTIONAL:
1402 set_bit(DMZ_RND, &zone->flags);
1403 break;
1404 case BLK_ZONE_TYPE_SEQWRITE_REQ:
1405 case BLK_ZONE_TYPE_SEQWRITE_PREF:
1406 set_bit(DMZ_SEQ, &zone->flags);
1407 break;
1408 default:
1409 return -ENXIO;
1410 }
1411
1412 if (dmz_is_rnd(zone))
1413 zone->wp_block = 0;
1414 else
1415 zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start);
1416
1417 if (blkz->cond == BLK_ZONE_COND_OFFLINE)
1418 set_bit(DMZ_OFFLINE, &zone->flags);
1419 else if (blkz->cond == BLK_ZONE_COND_READONLY)
1420 set_bit(DMZ_READ_ONLY, &zone->flags);
1421 else {
1422 zmd->nr_useable_zones++;
1423 if (dmz_is_rnd(zone)) {
1424 zmd->nr_rnd_zones++;
1425 if (zmd->nr_devs == 1 && !zmd->sb[0].zone) {
1426 /* Primary super block zone */
1427 zmd->sb[0].zone = zone;
1428 }
1429 }
1430 if (zmd->nr_devs > 1 && num == 0) {
1431 /*
1432 * Tertiary superblock zones are always at the
1433 * start of the zoned devices, so mark them
1434 * as metadata zone.
1435 */
1436 set_bit(DMZ_META, &zone->flags);
1437 }
1438 }
1439 return 0;
1440}
1441
1442static int dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev)
1443{
1444 int idx;
1445 sector_t zone_offset = 0;
1446
1447 for(idx = 0; idx < dev->nr_zones; idx++) {
1448 struct dm_zone *zone;
1449
1450 zone = dmz_insert(zmd, idx, dev);
1451 if (IS_ERR(zone))
1452 return PTR_ERR(zone);
1453 set_bit(DMZ_CACHE, &zone->flags);
1454 zone->wp_block = 0;
1455 zmd->nr_cache_zones++;
1456 zmd->nr_useable_zones++;
1457 if (dev->capacity - zone_offset < zmd->zone_nr_sectors) {
1458 /* Disable runt zone */
1459 set_bit(DMZ_OFFLINE, &zone->flags);
1460 break;
1461 }
1462 zone_offset += zmd->zone_nr_sectors;
1463 }
1464 return 0;
1465}
1466
1467/*
1468 * Free zones descriptors.
1469 */
1470static void dmz_drop_zones(struct dmz_metadata *zmd)
1471{
1472 int idx;
1473
1474 for(idx = 0; idx < zmd->nr_zones; idx++) {
1475 struct dm_zone *zone = xa_load(&zmd->zones, idx);
1476
1477 kfree(zone);
1478 xa_erase(&zmd->zones, idx);
1479 }
1480 xa_destroy(&zmd->zones);
1481}
1482
1483/*
1484 * Allocate and initialize zone descriptors using the zone
1485 * information from disk.
1486 */
1487static int dmz_init_zones(struct dmz_metadata *zmd)
1488{
1489 int i, ret;
1490 struct dmz_dev *zoned_dev = &zmd->dev[0];
1491
1492 /* Init */
1493 zmd->zone_nr_sectors = zmd->dev[0].zone_nr_sectors;
1494 zmd->zone_nr_sectors_shift = ilog2(zmd->zone_nr_sectors);
1495 zmd->zone_nr_blocks = dmz_sect2blk(zmd->zone_nr_sectors);
1496 zmd->zone_nr_blocks_shift = ilog2(zmd->zone_nr_blocks);
1497 zmd->zone_bitmap_size = zmd->zone_nr_blocks >> 3;
1498 zmd->zone_nr_bitmap_blocks =
1499 max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT);
1500 zmd->zone_bits_per_mblk = min_t(sector_t, zmd->zone_nr_blocks,
1501 DMZ_BLOCK_SIZE_BITS);
1502
1503 /* Allocate zone array */
1504 zmd->nr_zones = 0;
1505 for (i = 0; i < zmd->nr_devs; i++) {
1506 struct dmz_dev *dev = &zmd->dev[i];
1507
1508 dev->metadata = zmd;
1509 zmd->nr_zones += dev->nr_zones;
1510
1511 atomic_set(&dev->unmap_nr_rnd, 0);
1512 INIT_LIST_HEAD(&dev->unmap_rnd_list);
1513 INIT_LIST_HEAD(&dev->map_rnd_list);
1514
1515 atomic_set(&dev->unmap_nr_seq, 0);
1516 INIT_LIST_HEAD(&dev->unmap_seq_list);
1517 INIT_LIST_HEAD(&dev->map_seq_list);
1518 }
1519
1520 if (!zmd->nr_zones) {
1521 DMERR("(%s): No zones found", zmd->devname);
1522 return -ENXIO;
1523 }
1524 xa_init(&zmd->zones);
1525
1526 DMDEBUG("(%s): Using %zu B for zone information",
1527 zmd->devname, sizeof(struct dm_zone) * zmd->nr_zones);
1528
1529 if (zmd->nr_devs > 1) {
1530 ret = dmz_emulate_zones(zmd, &zmd->dev[0]);
1531 if (ret < 0) {
1532 DMDEBUG("(%s): Failed to emulate zones, error %d",
1533 zmd->devname, ret);
1534 dmz_drop_zones(zmd);
1535 return ret;
1536 }
1537
1538 /*
1539 * Primary superblock zone is always at zone 0 when multiple
1540 * drives are present.
1541 */
1542 zmd->sb[0].zone = dmz_get(zmd, 0);
1543
1544 for (i = 1; i < zmd->nr_devs; i++) {
1545 zoned_dev = &zmd->dev[i];
1546
1547 ret = blkdev_report_zones(zoned_dev->bdev, 0,
1548 BLK_ALL_ZONES,
1549 dmz_init_zone, zoned_dev);
1550 if (ret < 0) {
1551 DMDEBUG("(%s): Failed to report zones, error %d",
1552 zmd->devname, ret);
1553 dmz_drop_zones(zmd);
1554 return ret;
1555 }
1556 }
1557 return 0;
1558 }
1559
1560 /*
1561 * Get zone information and initialize zone descriptors. At the same
1562 * time, determine where the super block should be: first block of the
1563 * first randomly writable zone.
1564 */
1565 ret = blkdev_report_zones(zoned_dev->bdev, 0, BLK_ALL_ZONES,
1566 dmz_init_zone, zoned_dev);
1567 if (ret < 0) {
1568 DMDEBUG("(%s): Failed to report zones, error %d",
1569 zmd->devname, ret);
1570 dmz_drop_zones(zmd);
1571 return ret;
1572 }
1573
1574 return 0;
1575}
1576
1577static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx,
1578 void *data)
1579{
1580 struct dm_zone *zone = data;
1581
1582 clear_bit(DMZ_OFFLINE, &zone->flags);
1583 clear_bit(DMZ_READ_ONLY, &zone->flags);
1584 if (blkz->cond == BLK_ZONE_COND_OFFLINE)
1585 set_bit(DMZ_OFFLINE, &zone->flags);
1586 else if (blkz->cond == BLK_ZONE_COND_READONLY)
1587 set_bit(DMZ_READ_ONLY, &zone->flags);
1588
1589 if (dmz_is_seq(zone))
1590 zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start);
1591 else
1592 zone->wp_block = 0;
1593 return 0;
1594}
1595
1596/*
1597 * Update a zone information.
1598 */
1599static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
1600{
1601 struct dmz_dev *dev = zone->dev;
1602 unsigned int noio_flag;
1603 int ret;
1604
1605 if (dev->flags & DMZ_BDEV_REGULAR)
1606 return 0;
1607
1608 /*
1609 * Get zone information from disk. Since blkdev_report_zones() uses
1610 * GFP_KERNEL by default for memory allocations, set the per-task
1611 * PF_MEMALLOC_NOIO flag so that all allocations are done as if
1612 * GFP_NOIO was specified.
1613 */
1614 noio_flag = memalloc_noio_save();
1615 ret = blkdev_report_zones(dev->bdev, dmz_start_sect(zmd, zone), 1,
1616 dmz_update_zone_cb, zone);
1617 memalloc_noio_restore(noio_flag);
1618
1619 if (ret == 0)
1620 ret = -EIO;
1621 if (ret < 0) {
1622 dmz_dev_err(dev, "Get zone %u report failed",
1623 zone->id);
1624 dmz_check_bdev(dev);
1625 return ret;
1626 }
1627
1628 return 0;
1629}
1630
1631/*
1632 * Check a zone write pointer position when the zone is marked
1633 * with the sequential write error flag.
1634 */
1635static int dmz_handle_seq_write_err(struct dmz_metadata *zmd,
1636 struct dm_zone *zone)
1637{
1638 struct dmz_dev *dev = zone->dev;
1639 unsigned int wp = 0;
1640 int ret;
1641
1642 wp = zone->wp_block;
1643 ret = dmz_update_zone(zmd, zone);
1644 if (ret)
1645 return ret;
1646
1647 dmz_dev_warn(dev, "Processing zone %u write error (zone wp %u/%u)",
1648 zone->id, zone->wp_block, wp);
1649
1650 if (zone->wp_block < wp) {
1651 dmz_invalidate_blocks(zmd, zone, zone->wp_block,
1652 wp - zone->wp_block);
1653 }
1654
1655 return 0;
1656}
1657
1658/*
1659 * Reset a zone write pointer.
1660 */
1661static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
1662{
1663 int ret;
1664
1665 /*
1666 * Ignore offline zones, read only zones,
1667 * and conventional zones.
1668 */
1669 if (dmz_is_offline(zone) ||
1670 dmz_is_readonly(zone) ||
1671 dmz_is_rnd(zone))
1672 return 0;
1673
1674 if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) {
1675 struct dmz_dev *dev = zone->dev;
1676
1677 ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET,
1678 dmz_start_sect(zmd, zone),
1679 zmd->zone_nr_sectors, GFP_NOIO);
1680 if (ret) {
1681 dmz_dev_err(dev, "Reset zone %u failed %d",
1682 zone->id, ret);
1683 return ret;
1684 }
1685 }
1686
1687 /* Clear write error bit and rewind write pointer position */
1688 clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags);
1689 zone->wp_block = 0;
1690
1691 return 0;
1692}
1693
1694static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone);
1695
1696/*
1697 * Initialize chunk mapping.
1698 */
1699static int dmz_load_mapping(struct dmz_metadata *zmd)
1700{
1701 struct dm_zone *dzone, *bzone;
1702 struct dmz_mblock *dmap_mblk = NULL;
1703 struct dmz_map *dmap;
1704 unsigned int i = 0, e = 0, chunk = 0;
1705 unsigned int dzone_id;
1706 unsigned int bzone_id;
1707
1708 /* Metadata block array for the chunk mapping table */
1709 zmd->map_mblk = kcalloc(zmd->nr_map_blocks,
1710 sizeof(struct dmz_mblk *), GFP_KERNEL);
1711 if (!zmd->map_mblk)
1712 return -ENOMEM;
1713
1714 /* Get chunk mapping table blocks and initialize zone mapping */
1715 while (chunk < zmd->nr_chunks) {
1716 if (!dmap_mblk) {
1717 /* Get mapping block */
1718 dmap_mblk = dmz_get_mblock(zmd, i + 1);
1719 if (IS_ERR(dmap_mblk))
1720 return PTR_ERR(dmap_mblk);
1721 zmd->map_mblk[i] = dmap_mblk;
1722 dmap = (struct dmz_map *) dmap_mblk->data;
1723 i++;
1724 e = 0;
1725 }
1726
1727 /* Check data zone */
1728 dzone_id = le32_to_cpu(dmap[e].dzone_id);
1729 if (dzone_id == DMZ_MAP_UNMAPPED)
1730 goto next;
1731
1732 if (dzone_id >= zmd->nr_zones) {
1733 dmz_zmd_err(zmd, "Chunk %u mapping: invalid data zone ID %u",
1734 chunk, dzone_id);
1735 return -EIO;
1736 }
1737
1738 dzone = dmz_get(zmd, dzone_id);
1739 if (!dzone) {
1740 dmz_zmd_err(zmd, "Chunk %u mapping: data zone %u not present",
1741 chunk, dzone_id);
1742 return -EIO;
1743 }
1744 set_bit(DMZ_DATA, &dzone->flags);
1745 dzone->chunk = chunk;
1746 dmz_get_zone_weight(zmd, dzone);
1747
1748 if (dmz_is_cache(dzone))
1749 list_add_tail(&dzone->link, &zmd->map_cache_list);
1750 else if (dmz_is_rnd(dzone))
1751 list_add_tail(&dzone->link, &dzone->dev->map_rnd_list);
1752 else
1753 list_add_tail(&dzone->link, &dzone->dev->map_seq_list);
1754
1755 /* Check buffer zone */
1756 bzone_id = le32_to_cpu(dmap[e].bzone_id);
1757 if (bzone_id == DMZ_MAP_UNMAPPED)
1758 goto next;
1759
1760 if (bzone_id >= zmd->nr_zones) {
1761 dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone ID %u",
1762 chunk, bzone_id);
1763 return -EIO;
1764 }
1765
1766 bzone = dmz_get(zmd, bzone_id);
1767 if (!bzone) {
1768 dmz_zmd_err(zmd, "Chunk %u mapping: buffer zone %u not present",
1769 chunk, bzone_id);
1770 return -EIO;
1771 }
1772 if (!dmz_is_rnd(bzone) && !dmz_is_cache(bzone)) {
1773 dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone %u",
1774 chunk, bzone_id);
1775 return -EIO;
1776 }
1777
1778 set_bit(DMZ_DATA, &bzone->flags);
1779 set_bit(DMZ_BUF, &bzone->flags);
1780 bzone->chunk = chunk;
1781 bzone->bzone = dzone;
1782 dzone->bzone = bzone;
1783 dmz_get_zone_weight(zmd, bzone);
1784 if (dmz_is_cache(bzone))
1785 list_add_tail(&bzone->link, &zmd->map_cache_list);
1786 else
1787 list_add_tail(&bzone->link, &bzone->dev->map_rnd_list);
1788next:
1789 chunk++;
1790 e++;
1791 if (e >= DMZ_MAP_ENTRIES)
1792 dmap_mblk = NULL;
1793 }
1794
1795 /*
1796 * At this point, only meta zones and mapped data zones were
1797 * fully initialized. All remaining zones are unmapped data
1798 * zones. Finish initializing those here.
1799 */
1800 for (i = 0; i < zmd->nr_zones; i++) {
1801 dzone = dmz_get(zmd, i);
1802 if (!dzone)
1803 continue;
1804 if (dmz_is_meta(dzone))
1805 continue;
1806 if (dmz_is_offline(dzone))
1807 continue;
1808
1809 if (dmz_is_cache(dzone))
1810 zmd->nr_cache++;
1811 else if (dmz_is_rnd(dzone))
1812 dzone->dev->nr_rnd++;
1813 else
1814 dzone->dev->nr_seq++;
1815
1816 if (dmz_is_data(dzone)) {
1817 /* Already initialized */
1818 continue;
1819 }
1820
1821 /* Unmapped data zone */
1822 set_bit(DMZ_DATA, &dzone->flags);
1823 dzone->chunk = DMZ_MAP_UNMAPPED;
1824 if (dmz_is_cache(dzone)) {
1825 list_add_tail(&dzone->link, &zmd->unmap_cache_list);
1826 atomic_inc(&zmd->unmap_nr_cache);
1827 } else if (dmz_is_rnd(dzone)) {
1828 list_add_tail(&dzone->link,
1829 &dzone->dev->unmap_rnd_list);
1830 atomic_inc(&dzone->dev->unmap_nr_rnd);
1831 } else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) {
1832 list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list);
1833 set_bit(DMZ_RESERVED, &dzone->flags);
1834 atomic_inc(&zmd->nr_reserved_seq_zones);
1835 dzone->dev->nr_seq--;
1836 } else {
1837 list_add_tail(&dzone->link,
1838 &dzone->dev->unmap_seq_list);
1839 atomic_inc(&dzone->dev->unmap_nr_seq);
1840 }
1841 }
1842
1843 return 0;
1844}
1845
1846/*
1847 * Set a data chunk mapping.
1848 */
1849static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk,
1850 unsigned int dzone_id, unsigned int bzone_id)
1851{
1852 struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT];
1853 struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data;
1854 int map_idx = chunk & DMZ_MAP_ENTRIES_MASK;
1855
1856 dmap[map_idx].dzone_id = cpu_to_le32(dzone_id);
1857 dmap[map_idx].bzone_id = cpu_to_le32(bzone_id);
1858 dmz_dirty_mblock(zmd, dmap_mblk);
1859}
1860
1861/*
1862 * The list of mapped zones is maintained in LRU order.
1863 * This rotates a zone at the end of its map list.
1864 */
1865static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
1866{
1867 if (list_empty(&zone->link))
1868 return;
1869
1870 list_del_init(&zone->link);
1871 if (dmz_is_seq(zone)) {
1872 /* LRU rotate sequential zone */
1873 list_add_tail(&zone->link, &zone->dev->map_seq_list);
1874 } else if (dmz_is_cache(zone)) {
1875 /* LRU rotate cache zone */
1876 list_add_tail(&zone->link, &zmd->map_cache_list);
1877 } else {
1878 /* LRU rotate random zone */
1879 list_add_tail(&zone->link, &zone->dev->map_rnd_list);
1880 }
1881}
1882
1883/*
1884 * The list of mapped random zones is maintained
1885 * in LRU order. This rotates a zone at the end of the list.
1886 */
1887static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
1888{
1889 __dmz_lru_zone(zmd, zone);
1890 if (zone->bzone)
1891 __dmz_lru_zone(zmd, zone->bzone);
1892}
1893
1894/*
1895 * Wait for any zone to be freed.
1896 */
1897static void dmz_wait_for_free_zones(struct dmz_metadata *zmd)
1898{
1899 DEFINE_WAIT(wait);
1900
1901 prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE);
1902 dmz_unlock_map(zmd);
1903 dmz_unlock_metadata(zmd);
1904
1905 io_schedule_timeout(HZ);
1906
1907 dmz_lock_metadata(zmd);
1908 dmz_lock_map(zmd);
1909 finish_wait(&zmd->free_wq, &wait);
1910}
1911
1912/*
1913 * Lock a zone for reclaim (set the zone RECLAIM bit).
1914 * Returns false if the zone cannot be locked or if it is already locked
1915 * and 1 otherwise.
1916 */
1917int dmz_lock_zone_reclaim(struct dm_zone *zone)
1918{
1919 /* Active zones cannot be reclaimed */
1920 if (dmz_is_active(zone))
1921 return 0;
1922
1923 return !test_and_set_bit(DMZ_RECLAIM, &zone->flags);
1924}
1925
1926/*
1927 * Clear a zone reclaim flag.
1928 */
1929void dmz_unlock_zone_reclaim(struct dm_zone *zone)
1930{
1931 WARN_ON(dmz_is_active(zone));
1932 WARN_ON(!dmz_in_reclaim(zone));
1933
1934 clear_bit_unlock(DMZ_RECLAIM, &zone->flags);
1935 smp_mb__after_atomic();
1936 wake_up_bit(&zone->flags, DMZ_RECLAIM);
1937}
1938
1939/*
1940 * Wait for a zone reclaim to complete.
1941 */
1942static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone)
1943{
1944 dmz_unlock_map(zmd);
1945 dmz_unlock_metadata(zmd);
1946 set_bit(DMZ_RECLAIM_TERMINATE, &zone->flags);
1947 wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ);
1948 clear_bit(DMZ_RECLAIM_TERMINATE, &zone->flags);
1949 dmz_lock_metadata(zmd);
1950 dmz_lock_map(zmd);
1951}
1952
1953/*
1954 * Select a cache or random write zone for reclaim.
1955 */
1956static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
1957 unsigned int idx, bool idle)
1958{
1959 struct dm_zone *dzone = NULL;
1960 struct dm_zone *zone, *maxw_z = NULL;
1961 struct list_head *zone_list;
1962
1963 /* If we have cache zones select from the cache zone list */
1964 if (zmd->nr_cache) {
1965 zone_list = &zmd->map_cache_list;
1966 /* Try to relaim random zones, too, when idle */
1967 if (idle && list_empty(zone_list))
1968 zone_list = &zmd->dev[idx].map_rnd_list;
1969 } else
1970 zone_list = &zmd->dev[idx].map_rnd_list;
1971
1972 /*
1973 * Find the buffer zone with the heaviest weight or the first (oldest)
1974 * data zone that can be reclaimed.
1975 */
1976 list_for_each_entry(zone, zone_list, link) {
1977 if (dmz_is_buf(zone)) {
1978 dzone = zone->bzone;
1979 if (dmz_is_rnd(dzone) && dzone->dev->dev_idx != idx)
1980 continue;
1981 if (!maxw_z || maxw_z->weight < dzone->weight)
1982 maxw_z = dzone;
1983 } else {
1984 dzone = zone;
1985 if (dmz_lock_zone_reclaim(dzone))
1986 return dzone;
1987 }
1988 }
1989
1990 if (maxw_z && dmz_lock_zone_reclaim(maxw_z))
1991 return maxw_z;
1992
1993 /*
1994 * If we come here, none of the zones inspected could be locked for
1995 * reclaim. Try again, being more aggressive, that is, find the
1996 * first zone that can be reclaimed regardless of its weitght.
1997 */
1998 list_for_each_entry(zone, zone_list, link) {
1999 if (dmz_is_buf(zone)) {
2000 dzone = zone->bzone;
2001 if (dmz_is_rnd(dzone) && dzone->dev->dev_idx != idx)
2002 continue;
2003 } else
2004 dzone = zone;
2005 if (dmz_lock_zone_reclaim(dzone))
2006 return dzone;
2007 }
2008
2009 return NULL;
2010}
2011
2012/*
2013 * Select a buffered sequential zone for reclaim.
2014 */
2015static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd,
2016 unsigned int idx)
2017{
2018 struct dm_zone *zone;
2019
2020 list_for_each_entry(zone, &zmd->dev[idx].map_seq_list, link) {
2021 if (!zone->bzone)
2022 continue;
2023 if (dmz_lock_zone_reclaim(zone))
2024 return zone;
2025 }
2026
2027 return NULL;
2028}
2029
2030/*
2031 * Select a zone for reclaim.
2032 */
2033struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd,
2034 unsigned int dev_idx, bool idle)
2035{
2036 struct dm_zone *zone = NULL;
2037
2038 /*
2039 * Search for a zone candidate to reclaim: 2 cases are possible.
2040 * (1) There is no free sequential zones. Then a random data zone
2041 * cannot be reclaimed. So choose a sequential zone to reclaim so
2042 * that afterward a random zone can be reclaimed.
2043 * (2) At least one free sequential zone is available, then choose
2044 * the oldest random zone (data or buffer) that can be locked.
2045 */
2046 dmz_lock_map(zmd);
2047 if (list_empty(&zmd->reserved_seq_zones_list))
2048 zone = dmz_get_seq_zone_for_reclaim(zmd, dev_idx);
2049 if (!zone)
2050 zone = dmz_get_rnd_zone_for_reclaim(zmd, dev_idx, idle);
2051 dmz_unlock_map(zmd);
2052
2053 return zone;
2054}
2055
2056/*
2057 * Get the zone mapping a chunk, if the chunk is mapped already.
2058 * If no mapping exist and the operation is WRITE, a zone is
2059 * allocated and used to map the chunk.
2060 * The zone returned will be set to the active state.
2061 */
2062struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op)
2063{
2064 struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT];
2065 struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data;
2066 int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK;
2067 unsigned int dzone_id;
2068 struct dm_zone *dzone = NULL;
2069 int ret = 0;
2070 int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND;
2071
2072 dmz_lock_map(zmd);
2073again:
2074 /* Get the chunk mapping */
2075 dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id);
2076 if (dzone_id == DMZ_MAP_UNMAPPED) {
2077 /*
2078 * Read or discard in unmapped chunks are fine. But for
2079 * writes, we need a mapping, so get one.
2080 */
2081 if (op != REQ_OP_WRITE)
2082 goto out;
2083
2084 /* Allocate a random zone */
2085 dzone = dmz_alloc_zone(zmd, 0, alloc_flags);
2086 if (!dzone) {
2087 if (dmz_dev_is_dying(zmd)) {
2088 dzone = ERR_PTR(-EIO);
2089 goto out;
2090 }
2091 dmz_wait_for_free_zones(zmd);
2092 goto again;
2093 }
2094
2095 dmz_map_zone(zmd, dzone, chunk);
2096
2097 } else {
2098 /* The chunk is already mapped: get the mapping zone */
2099 dzone = dmz_get(zmd, dzone_id);
2100 if (!dzone) {
2101 dzone = ERR_PTR(-EIO);
2102 goto out;
2103 }
2104 if (dzone->chunk != chunk) {
2105 dzone = ERR_PTR(-EIO);
2106 goto out;
2107 }
2108
2109 /* Repair write pointer if the sequential dzone has error */
2110 if (dmz_seq_write_err(dzone)) {
2111 ret = dmz_handle_seq_write_err(zmd, dzone);
2112 if (ret) {
2113 dzone = ERR_PTR(-EIO);
2114 goto out;
2115 }
2116 clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags);
2117 }
2118 }
2119
2120 /*
2121 * If the zone is being reclaimed, the chunk mapping may change
2122 * to a different zone. So wait for reclaim and retry. Otherwise,
2123 * activate the zone (this will prevent reclaim from touching it).
2124 */
2125 if (dmz_in_reclaim(dzone)) {
2126 dmz_wait_for_reclaim(zmd, dzone);
2127 goto again;
2128 }
2129 dmz_activate_zone(dzone);
2130 dmz_lru_zone(zmd, dzone);
2131out:
2132 dmz_unlock_map(zmd);
2133
2134 return dzone;
2135}
2136
2137/*
2138 * Write and discard change the block validity of data zones and their buffer
2139 * zones. Check here that valid blocks are still present. If all blocks are
2140 * invalid, the zones can be unmapped on the fly without waiting for reclaim
2141 * to do it.
2142 */
2143void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone)
2144{
2145 struct dm_zone *bzone;
2146
2147 dmz_lock_map(zmd);
2148
2149 bzone = dzone->bzone;
2150 if (bzone) {
2151 if (dmz_weight(bzone))
2152 dmz_lru_zone(zmd, bzone);
2153 else {
2154 /* Empty buffer zone: reclaim it */
2155 dmz_unmap_zone(zmd, bzone);
2156 dmz_free_zone(zmd, bzone);
2157 bzone = NULL;
2158 }
2159 }
2160
2161 /* Deactivate the data zone */
2162 dmz_deactivate_zone(dzone);
2163 if (dmz_is_active(dzone) || bzone || dmz_weight(dzone))
2164 dmz_lru_zone(zmd, dzone);
2165 else {
2166 /* Unbuffered inactive empty data zone: reclaim it */
2167 dmz_unmap_zone(zmd, dzone);
2168 dmz_free_zone(zmd, dzone);
2169 }
2170
2171 dmz_unlock_map(zmd);
2172}
2173
2174/*
2175 * Allocate and map a random zone to buffer a chunk
2176 * already mapped to a sequential zone.
2177 */
2178struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
2179 struct dm_zone *dzone)
2180{
2181 struct dm_zone *bzone;
2182 int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND;
2183
2184 dmz_lock_map(zmd);
2185again:
2186 bzone = dzone->bzone;
2187 if (bzone)
2188 goto out;
2189
2190 /* Allocate a random zone */
2191 bzone = dmz_alloc_zone(zmd, 0, alloc_flags);
2192 if (!bzone) {
2193 if (dmz_dev_is_dying(zmd)) {
2194 bzone = ERR_PTR(-EIO);
2195 goto out;
2196 }
2197 dmz_wait_for_free_zones(zmd);
2198 goto again;
2199 }
2200
2201 /* Update the chunk mapping */
2202 dmz_set_chunk_mapping(zmd, dzone->chunk, dzone->id, bzone->id);
2203
2204 set_bit(DMZ_BUF, &bzone->flags);
2205 bzone->chunk = dzone->chunk;
2206 bzone->bzone = dzone;
2207 dzone->bzone = bzone;
2208 if (dmz_is_cache(bzone))
2209 list_add_tail(&bzone->link, &zmd->map_cache_list);
2210 else
2211 list_add_tail(&bzone->link, &bzone->dev->map_rnd_list);
2212out:
2213 dmz_unlock_map(zmd);
2214
2215 return bzone;
2216}
2217
2218/*
2219 * Get an unmapped (free) zone.
2220 * This must be called with the mapping lock held.
2221 */
2222struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned int dev_idx,
2223 unsigned long flags)
2224{
2225 struct list_head *list;
2226 struct dm_zone *zone;
2227 int i;
2228
2229 /* Schedule reclaim to ensure free zones are available */
2230 if (!(flags & DMZ_ALLOC_RECLAIM)) {
2231 for (i = 0; i < zmd->nr_devs; i++)
2232 dmz_schedule_reclaim(zmd->dev[i].reclaim);
2233 }
2234
2235 i = 0;
2236again:
2237 if (flags & DMZ_ALLOC_CACHE)
2238 list = &zmd->unmap_cache_list;
2239 else if (flags & DMZ_ALLOC_RND)
2240 list = &zmd->dev[dev_idx].unmap_rnd_list;
2241 else
2242 list = &zmd->dev[dev_idx].unmap_seq_list;
2243
2244 if (list_empty(list)) {
2245 /*
2246 * No free zone: return NULL if this is for not reclaim.
2247 */
2248 if (!(flags & DMZ_ALLOC_RECLAIM))
2249 return NULL;
2250 /*
2251 * Try to allocate from other devices
2252 */
2253 if (i < zmd->nr_devs) {
2254 dev_idx = (dev_idx + 1) % zmd->nr_devs;
2255 i++;
2256 goto again;
2257 }
2258
2259 /*
2260 * Fallback to the reserved sequential zones
2261 */
2262 zone = list_first_entry_or_null(&zmd->reserved_seq_zones_list,
2263 struct dm_zone, link);
2264 if (zone) {
2265 list_del_init(&zone->link);
2266 atomic_dec(&zmd->nr_reserved_seq_zones);
2267 }
2268 return zone;
2269 }
2270
2271 zone = list_first_entry(list, struct dm_zone, link);
2272 list_del_init(&zone->link);
2273
2274 if (dmz_is_cache(zone))
2275 atomic_dec(&zmd->unmap_nr_cache);
2276 else if (dmz_is_rnd(zone))
2277 atomic_dec(&zone->dev->unmap_nr_rnd);
2278 else
2279 atomic_dec(&zone->dev->unmap_nr_seq);
2280
2281 if (dmz_is_offline(zone)) {
2282 dmz_zmd_warn(zmd, "Zone %u is offline", zone->id);
2283 zone = NULL;
2284 goto again;
2285 }
2286 if (dmz_is_meta(zone)) {
2287 dmz_zmd_warn(zmd, "Zone %u has metadata", zone->id);
2288 zone = NULL;
2289 goto again;
2290 }
2291 return zone;
2292}
2293
2294/*
2295 * Free a zone.
2296 * This must be called with the mapping lock held.
2297 */
2298void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
2299{
2300 /* If this is a sequential zone, reset it */
2301 if (dmz_is_seq(zone))
2302 dmz_reset_zone(zmd, zone);
2303
2304 /* Return the zone to its type unmap list */
2305 if (dmz_is_cache(zone)) {
2306 list_add_tail(&zone->link, &zmd->unmap_cache_list);
2307 atomic_inc(&zmd->unmap_nr_cache);
2308 } else if (dmz_is_rnd(zone)) {
2309 list_add_tail(&zone->link, &zone->dev->unmap_rnd_list);
2310 atomic_inc(&zone->dev->unmap_nr_rnd);
2311 } else if (dmz_is_reserved(zone)) {
2312 list_add_tail(&zone->link, &zmd->reserved_seq_zones_list);
2313 atomic_inc(&zmd->nr_reserved_seq_zones);
2314 } else {
2315 list_add_tail(&zone->link, &zone->dev->unmap_seq_list);
2316 atomic_inc(&zone->dev->unmap_nr_seq);
2317 }
2318
2319 wake_up_all(&zmd->free_wq);
2320}
2321
2322/*
2323 * Map a chunk to a zone.
2324 * This must be called with the mapping lock held.
2325 */
2326void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone,
2327 unsigned int chunk)
2328{
2329 /* Set the chunk mapping */
2330 dmz_set_chunk_mapping(zmd, chunk, dzone->id,
2331 DMZ_MAP_UNMAPPED);
2332 dzone->chunk = chunk;
2333 if (dmz_is_cache(dzone))
2334 list_add_tail(&dzone->link, &zmd->map_cache_list);
2335 else if (dmz_is_rnd(dzone))
2336 list_add_tail(&dzone->link, &dzone->dev->map_rnd_list);
2337 else
2338 list_add_tail(&dzone->link, &dzone->dev->map_seq_list);
2339}
2340
2341/*
2342 * Unmap a zone.
2343 * This must be called with the mapping lock held.
2344 */
2345void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
2346{
2347 unsigned int chunk = zone->chunk;
2348 unsigned int dzone_id;
2349
2350 if (chunk == DMZ_MAP_UNMAPPED) {
2351 /* Already unmapped */
2352 return;
2353 }
2354
2355 if (test_and_clear_bit(DMZ_BUF, &zone->flags)) {
2356 /*
2357 * Unmapping the chunk buffer zone: clear only
2358 * the chunk buffer mapping
2359 */
2360 dzone_id = zone->bzone->id;
2361 zone->bzone->bzone = NULL;
2362 zone->bzone = NULL;
2363
2364 } else {
2365 /*
2366 * Unmapping the chunk data zone: the zone must
2367 * not be buffered.
2368 */
2369 if (WARN_ON(zone->bzone)) {
2370 zone->bzone->bzone = NULL;
2371 zone->bzone = NULL;
2372 }
2373 dzone_id = DMZ_MAP_UNMAPPED;
2374 }
2375
2376 dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED);
2377
2378 zone->chunk = DMZ_MAP_UNMAPPED;
2379 list_del_init(&zone->link);
2380}
2381
2382/*
2383 * Set @nr_bits bits in @bitmap starting from @bit.
2384 * Return the number of bits changed from 0 to 1.
2385 */
2386static unsigned int dmz_set_bits(unsigned long *bitmap,
2387 unsigned int bit, unsigned int nr_bits)
2388{
2389 unsigned long *addr;
2390 unsigned int end = bit + nr_bits;
2391 unsigned int n = 0;
2392
2393 while (bit < end) {
2394 if (((bit & (BITS_PER_LONG - 1)) == 0) &&
2395 ((end - bit) >= BITS_PER_LONG)) {
2396 /* Try to set the whole word at once */
2397 addr = bitmap + BIT_WORD(bit);
2398 if (*addr == 0) {
2399 *addr = ULONG_MAX;
2400 n += BITS_PER_LONG;
2401 bit += BITS_PER_LONG;
2402 continue;
2403 }
2404 }
2405
2406 if (!test_and_set_bit(bit, bitmap))
2407 n++;
2408 bit++;
2409 }
2410
2411 return n;
2412}
2413
2414/*
2415 * Get the bitmap block storing the bit for chunk_block in zone.
2416 */
2417static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd,
2418 struct dm_zone *zone,
2419 sector_t chunk_block)
2420{
2421 sector_t bitmap_block = 1 + zmd->nr_map_blocks +
2422 (sector_t)(zone->id * zmd->zone_nr_bitmap_blocks) +
2423 (chunk_block >> DMZ_BLOCK_SHIFT_BITS);
2424
2425 return dmz_get_mblock(zmd, bitmap_block);
2426}
2427
2428/*
2429 * Copy the valid blocks bitmap of from_zone to the bitmap of to_zone.
2430 */
2431int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
2432 struct dm_zone *to_zone)
2433{
2434 struct dmz_mblock *from_mblk, *to_mblk;
2435 sector_t chunk_block = 0;
2436
2437 /* Get the zones bitmap blocks */
2438 while (chunk_block < zmd->zone_nr_blocks) {
2439 from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block);
2440 if (IS_ERR(from_mblk))
2441 return PTR_ERR(from_mblk);
2442 to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block);
2443 if (IS_ERR(to_mblk)) {
2444 dmz_release_mblock(zmd, from_mblk);
2445 return PTR_ERR(to_mblk);
2446 }
2447
2448 memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE);
2449 dmz_dirty_mblock(zmd, to_mblk);
2450
2451 dmz_release_mblock(zmd, to_mblk);
2452 dmz_release_mblock(zmd, from_mblk);
2453
2454 chunk_block += zmd->zone_bits_per_mblk;
2455 }
2456
2457 to_zone->weight = from_zone->weight;
2458
2459 return 0;
2460}
2461
2462/*
2463 * Merge the valid blocks bitmap of from_zone into the bitmap of to_zone,
2464 * starting from chunk_block.
2465 */
2466int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
2467 struct dm_zone *to_zone, sector_t chunk_block)
2468{
2469 unsigned int nr_blocks;
2470 int ret;
2471
2472 /* Get the zones bitmap blocks */
2473 while (chunk_block < zmd->zone_nr_blocks) {
2474 /* Get a valid region from the source zone */
2475 ret = dmz_first_valid_block(zmd, from_zone, &chunk_block);
2476 if (ret <= 0)
2477 return ret;
2478
2479 nr_blocks = ret;
2480 ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks);
2481 if (ret)
2482 return ret;
2483
2484 chunk_block += nr_blocks;
2485 }
2486
2487 return 0;
2488}
2489
2490/*
2491 * Validate all the blocks in the range [block..block+nr_blocks-1].
2492 */
2493int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
2494 sector_t chunk_block, unsigned int nr_blocks)
2495{
2496 unsigned int count, bit, nr_bits;
2497 unsigned int zone_nr_blocks = zmd->zone_nr_blocks;
2498 struct dmz_mblock *mblk;
2499 unsigned int n = 0;
2500
2501 dmz_zmd_debug(zmd, "=> VALIDATE zone %u, block %llu, %u blocks",
2502 zone->id, (unsigned long long)chunk_block,
2503 nr_blocks);
2504
2505 WARN_ON(chunk_block + nr_blocks > zone_nr_blocks);
2506
2507 while (nr_blocks) {
2508 /* Get bitmap block */
2509 mblk = dmz_get_bitmap(zmd, zone, chunk_block);
2510 if (IS_ERR(mblk))
2511 return PTR_ERR(mblk);
2512
2513 /* Set bits */
2514 bit = chunk_block & DMZ_BLOCK_MASK_BITS;
2515 nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
2516
2517 count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits);
2518 if (count) {
2519 dmz_dirty_mblock(zmd, mblk);
2520 n += count;
2521 }
2522 dmz_release_mblock(zmd, mblk);
2523
2524 nr_blocks -= nr_bits;
2525 chunk_block += nr_bits;
2526 }
2527
2528 if (likely(zone->weight + n <= zone_nr_blocks))
2529 zone->weight += n;
2530 else {
2531 dmz_zmd_warn(zmd, "Zone %u: weight %u should be <= %u",
2532 zone->id, zone->weight,
2533 zone_nr_blocks - n);
2534 zone->weight = zone_nr_blocks;
2535 }
2536
2537 return 0;
2538}
2539
2540/*
2541 * Clear nr_bits bits in bitmap starting from bit.
2542 * Return the number of bits cleared.
2543 */
2544static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits)
2545{
2546 unsigned long *addr;
2547 int end = bit + nr_bits;
2548 int n = 0;
2549
2550 while (bit < end) {
2551 if (((bit & (BITS_PER_LONG - 1)) == 0) &&
2552 ((end - bit) >= BITS_PER_LONG)) {
2553 /* Try to clear whole word at once */
2554 addr = bitmap + BIT_WORD(bit);
2555 if (*addr == ULONG_MAX) {
2556 *addr = 0;
2557 n += BITS_PER_LONG;
2558 bit += BITS_PER_LONG;
2559 continue;
2560 }
2561 }
2562
2563 if (test_and_clear_bit(bit, bitmap))
2564 n++;
2565 bit++;
2566 }
2567
2568 return n;
2569}
2570
2571/*
2572 * Invalidate all the blocks in the range [block..block+nr_blocks-1].
2573 */
2574int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
2575 sector_t chunk_block, unsigned int nr_blocks)
2576{
2577 unsigned int count, bit, nr_bits;
2578 struct dmz_mblock *mblk;
2579 unsigned int n = 0;
2580
2581 dmz_zmd_debug(zmd, "=> INVALIDATE zone %u, block %llu, %u blocks",
2582 zone->id, (u64)chunk_block, nr_blocks);
2583
2584 WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks);
2585
2586 while (nr_blocks) {
2587 /* Get bitmap block */
2588 mblk = dmz_get_bitmap(zmd, zone, chunk_block);
2589 if (IS_ERR(mblk))
2590 return PTR_ERR(mblk);
2591
2592 /* Clear bits */
2593 bit = chunk_block & DMZ_BLOCK_MASK_BITS;
2594 nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
2595
2596 count = dmz_clear_bits((unsigned long *)mblk->data,
2597 bit, nr_bits);
2598 if (count) {
2599 dmz_dirty_mblock(zmd, mblk);
2600 n += count;
2601 }
2602 dmz_release_mblock(zmd, mblk);
2603
2604 nr_blocks -= nr_bits;
2605 chunk_block += nr_bits;
2606 }
2607
2608 if (zone->weight >= n)
2609 zone->weight -= n;
2610 else {
2611 dmz_zmd_warn(zmd, "Zone %u: weight %u should be >= %u",
2612 zone->id, zone->weight, n);
2613 zone->weight = 0;
2614 }
2615
2616 return 0;
2617}
2618
2619/*
2620 * Get a block bit value.
2621 */
2622static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone,
2623 sector_t chunk_block)
2624{
2625 struct dmz_mblock *mblk;
2626 int ret;
2627
2628 WARN_ON(chunk_block >= zmd->zone_nr_blocks);
2629
2630 /* Get bitmap block */
2631 mblk = dmz_get_bitmap(zmd, zone, chunk_block);
2632 if (IS_ERR(mblk))
2633 return PTR_ERR(mblk);
2634
2635 /* Get offset */
2636 ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS,
2637 (unsigned long *) mblk->data) != 0;
2638
2639 dmz_release_mblock(zmd, mblk);
2640
2641 return ret;
2642}
2643
2644/*
2645 * Return the number of blocks from chunk_block to the first block with a bit
2646 * value specified by set. Search at most nr_blocks blocks from chunk_block.
2647 */
2648static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone,
2649 sector_t chunk_block, unsigned int nr_blocks,
2650 int set)
2651{
2652 struct dmz_mblock *mblk;
2653 unsigned int bit, set_bit, nr_bits;
2654 unsigned int zone_bits = zmd->zone_bits_per_mblk;
2655 unsigned long *bitmap;
2656 int n = 0;
2657
2658 WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks);
2659
2660 while (nr_blocks) {
2661 /* Get bitmap block */
2662 mblk = dmz_get_bitmap(zmd, zone, chunk_block);
2663 if (IS_ERR(mblk))
2664 return PTR_ERR(mblk);
2665
2666 /* Get offset */
2667 bitmap = (unsigned long *) mblk->data;
2668 bit = chunk_block & DMZ_BLOCK_MASK_BITS;
2669 nr_bits = min(nr_blocks, zone_bits - bit);
2670 if (set)
2671 set_bit = find_next_bit(bitmap, zone_bits, bit);
2672 else
2673 set_bit = find_next_zero_bit(bitmap, zone_bits, bit);
2674 dmz_release_mblock(zmd, mblk);
2675
2676 n += set_bit - bit;
2677 if (set_bit < zone_bits)
2678 break;
2679
2680 nr_blocks -= nr_bits;
2681 chunk_block += nr_bits;
2682 }
2683
2684 return n;
2685}
2686
2687/*
2688 * Test if chunk_block is valid. If it is, the number of consecutive
2689 * valid blocks from chunk_block will be returned.
2690 */
2691int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone,
2692 sector_t chunk_block)
2693{
2694 int valid;
2695
2696 valid = dmz_test_block(zmd, zone, chunk_block);
2697 if (valid <= 0)
2698 return valid;
2699
2700 /* The block is valid: get the number of valid blocks from block */
2701 return dmz_to_next_set_block(zmd, zone, chunk_block,
2702 zmd->zone_nr_blocks - chunk_block, 0);
2703}
2704
2705/*
2706 * Find the first valid block from @chunk_block in @zone.
2707 * If such a block is found, its number is returned using
2708 * @chunk_block and the total number of valid blocks from @chunk_block
2709 * is returned.
2710 */
2711int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone,
2712 sector_t *chunk_block)
2713{
2714 sector_t start_block = *chunk_block;
2715 int ret;
2716
2717 ret = dmz_to_next_set_block(zmd, zone, start_block,
2718 zmd->zone_nr_blocks - start_block, 1);
2719 if (ret < 0)
2720 return ret;
2721
2722 start_block += ret;
2723 *chunk_block = start_block;
2724
2725 return dmz_to_next_set_block(zmd, zone, start_block,
2726 zmd->zone_nr_blocks - start_block, 0);
2727}
2728
2729/*
2730 * Count the number of bits set starting from bit up to bit + nr_bits - 1.
2731 */
2732static int dmz_count_bits(void *bitmap, int bit, int nr_bits)
2733{
2734 unsigned long *addr;
2735 int end = bit + nr_bits;
2736 int n = 0;
2737
2738 while (bit < end) {
2739 if (((bit & (BITS_PER_LONG - 1)) == 0) &&
2740 ((end - bit) >= BITS_PER_LONG)) {
2741 addr = (unsigned long *)bitmap + BIT_WORD(bit);
2742 if (*addr == ULONG_MAX) {
2743 n += BITS_PER_LONG;
2744 bit += BITS_PER_LONG;
2745 continue;
2746 }
2747 }
2748
2749 if (test_bit(bit, bitmap))
2750 n++;
2751 bit++;
2752 }
2753
2754 return n;
2755}
2756
2757/*
2758 * Get a zone weight.
2759 */
2760static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone)
2761{
2762 struct dmz_mblock *mblk;
2763 sector_t chunk_block = 0;
2764 unsigned int bit, nr_bits;
2765 unsigned int nr_blocks = zmd->zone_nr_blocks;
2766 void *bitmap;
2767 int n = 0;
2768
2769 while (nr_blocks) {
2770 /* Get bitmap block */
2771 mblk = dmz_get_bitmap(zmd, zone, chunk_block);
2772 if (IS_ERR(mblk)) {
2773 n = 0;
2774 break;
2775 }
2776
2777 /* Count bits in this block */
2778 bitmap = mblk->data;
2779 bit = chunk_block & DMZ_BLOCK_MASK_BITS;
2780 nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit);
2781 n += dmz_count_bits(bitmap, bit, nr_bits);
2782
2783 dmz_release_mblock(zmd, mblk);
2784
2785 nr_blocks -= nr_bits;
2786 chunk_block += nr_bits;
2787 }
2788
2789 zone->weight = n;
2790}
2791
2792/*
2793 * Cleanup the zoned metadata resources.
2794 */
2795static void dmz_cleanup_metadata(struct dmz_metadata *zmd)
2796{
2797 struct rb_root *root;
2798 struct dmz_mblock *mblk, *next;
2799 int i;
2800
2801 /* Release zone mapping resources */
2802 if (zmd->map_mblk) {
2803 for (i = 0; i < zmd->nr_map_blocks; i++)
2804 dmz_release_mblock(zmd, zmd->map_mblk[i]);
2805 kfree(zmd->map_mblk);
2806 zmd->map_mblk = NULL;
2807 }
2808
2809 /* Release super blocks */
2810 for (i = 0; i < 2; i++) {
2811 if (zmd->sb[i].mblk) {
2812 dmz_free_mblock(zmd, zmd->sb[i].mblk);
2813 zmd->sb[i].mblk = NULL;
2814 }
2815 }
2816
2817 /* Free cached blocks */
2818 while (!list_empty(&zmd->mblk_dirty_list)) {
2819 mblk = list_first_entry(&zmd->mblk_dirty_list,
2820 struct dmz_mblock, link);
2821 dmz_zmd_warn(zmd, "mblock %llu still in dirty list (ref %u)",
2822 (u64)mblk->no, mblk->ref);
2823 list_del_init(&mblk->link);
2824 rb_erase(&mblk->node, &zmd->mblk_rbtree);
2825 dmz_free_mblock(zmd, mblk);
2826 }
2827
2828 while (!list_empty(&zmd->mblk_lru_list)) {
2829 mblk = list_first_entry(&zmd->mblk_lru_list,
2830 struct dmz_mblock, link);
2831 list_del_init(&mblk->link);
2832 rb_erase(&mblk->node, &zmd->mblk_rbtree);
2833 dmz_free_mblock(zmd, mblk);
2834 }
2835
2836 /* Sanity checks: the mblock rbtree should now be empty */
2837 root = &zmd->mblk_rbtree;
2838 rbtree_postorder_for_each_entry_safe(mblk, next, root, node) {
2839 dmz_zmd_warn(zmd, "mblock %llu ref %u still in rbtree",
2840 (u64)mblk->no, mblk->ref);
2841 mblk->ref = 0;
2842 dmz_free_mblock(zmd, mblk);
2843 }
2844
2845 /* Free the zone descriptors */
2846 dmz_drop_zones(zmd);
2847
2848 mutex_destroy(&zmd->mblk_flush_lock);
2849 mutex_destroy(&zmd->map_lock);
2850}
2851
2852static void dmz_print_dev(struct dmz_metadata *zmd, int num)
2853{
2854 struct dmz_dev *dev = &zmd->dev[num];
2855
2856 if (bdev_zoned_model(dev->bdev) == BLK_ZONED_NONE)
2857 dmz_dev_info(dev, "Regular block device");
2858 else
2859 dmz_dev_info(dev, "Host-%s zoned block device",
2860 bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ?
2861 "aware" : "managed");
2862 if (zmd->sb_version > 1) {
2863 sector_t sector_offset =
2864 dev->zone_offset << zmd->zone_nr_sectors_shift;
2865
2866 dmz_dev_info(dev, " %llu 512-byte logical sectors (offset %llu)",
2867 (u64)dev->capacity, (u64)sector_offset);
2868 dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors (offset %llu)",
2869 dev->nr_zones, (u64)zmd->zone_nr_sectors,
2870 (u64)dev->zone_offset);
2871 } else {
2872 dmz_dev_info(dev, " %llu 512-byte logical sectors",
2873 (u64)dev->capacity);
2874 dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors",
2875 dev->nr_zones, (u64)zmd->zone_nr_sectors);
2876 }
2877}
2878
2879/*
2880 * Initialize the zoned metadata.
2881 */
2882int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
2883 struct dmz_metadata **metadata,
2884 const char *devname)
2885{
2886 struct dmz_metadata *zmd;
2887 unsigned int i;
2888 struct dm_zone *zone;
2889 int ret;
2890
2891 zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL);
2892 if (!zmd)
2893 return -ENOMEM;
2894
2895 strcpy(zmd->devname, devname);
2896 zmd->dev = dev;
2897 zmd->nr_devs = num_dev;
2898 zmd->mblk_rbtree = RB_ROOT;
2899 init_rwsem(&zmd->mblk_sem);
2900 mutex_init(&zmd->mblk_flush_lock);
2901 spin_lock_init(&zmd->mblk_lock);
2902 INIT_LIST_HEAD(&zmd->mblk_lru_list);
2903 INIT_LIST_HEAD(&zmd->mblk_dirty_list);
2904
2905 mutex_init(&zmd->map_lock);
2906
2907 atomic_set(&zmd->unmap_nr_cache, 0);
2908 INIT_LIST_HEAD(&zmd->unmap_cache_list);
2909 INIT_LIST_HEAD(&zmd->map_cache_list);
2910
2911 atomic_set(&zmd->nr_reserved_seq_zones, 0);
2912 INIT_LIST_HEAD(&zmd->reserved_seq_zones_list);
2913
2914 init_waitqueue_head(&zmd->free_wq);
2915
2916 /* Initialize zone descriptors */
2917 ret = dmz_init_zones(zmd);
2918 if (ret)
2919 goto err;
2920
2921 /* Get super block */
2922 ret = dmz_load_sb(zmd);
2923 if (ret)
2924 goto err;
2925
2926 /* Set metadata zones starting from sb_zone */
2927 for (i = 0; i < zmd->nr_meta_zones << 1; i++) {
2928 zone = dmz_get(zmd, zmd->sb[0].zone->id + i);
2929 if (!zone) {
2930 dmz_zmd_err(zmd,
2931 "metadata zone %u not present", i);
2932 ret = -ENXIO;
2933 goto err;
2934 }
2935 if (!dmz_is_rnd(zone) && !dmz_is_cache(zone)) {
2936 dmz_zmd_err(zmd,
2937 "metadata zone %d is not random", i);
2938 ret = -ENXIO;
2939 goto err;
2940 }
2941 set_bit(DMZ_META, &zone->flags);
2942 }
2943 /* Load mapping table */
2944 ret = dmz_load_mapping(zmd);
2945 if (ret)
2946 goto err;
2947
2948 /*
2949 * Cache size boundaries: allow at least 2 super blocks, the chunk map
2950 * blocks and enough blocks to be able to cache the bitmap blocks of
2951 * up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow
2952 * the cache to add 512 more metadata blocks.
2953 */
2954 zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16;
2955 zmd->max_nr_mblks = zmd->min_nr_mblks + 512;
2956 zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count;
2957 zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan;
2958 zmd->mblk_shrinker.seeks = DEFAULT_SEEKS;
2959
2960 /* Metadata cache shrinker */
2961 ret = register_shrinker(&zmd->mblk_shrinker);
2962 if (ret) {
2963 dmz_zmd_err(zmd, "Register metadata cache shrinker failed");
2964 goto err;
2965 }
2966
2967 dmz_zmd_info(zmd, "DM-Zoned metadata version %d", zmd->sb_version);
2968 for (i = 0; i < zmd->nr_devs; i++)
2969 dmz_print_dev(zmd, i);
2970
2971 dmz_zmd_info(zmd, " %u zones of %llu 512-byte logical sectors",
2972 zmd->nr_zones, (u64)zmd->zone_nr_sectors);
2973 dmz_zmd_debug(zmd, " %u metadata zones",
2974 zmd->nr_meta_zones * 2);
2975 dmz_zmd_debug(zmd, " %u data zones for %u chunks",
2976 zmd->nr_data_zones, zmd->nr_chunks);
2977 dmz_zmd_debug(zmd, " %u cache zones (%u unmapped)",
2978 zmd->nr_cache, atomic_read(&zmd->unmap_nr_cache));
2979 for (i = 0; i < zmd->nr_devs; i++) {
2980 dmz_zmd_debug(zmd, " %u random zones (%u unmapped)",
2981 dmz_nr_rnd_zones(zmd, i),
2982 dmz_nr_unmap_rnd_zones(zmd, i));
2983 dmz_zmd_debug(zmd, " %u sequential zones (%u unmapped)",
2984 dmz_nr_seq_zones(zmd, i),
2985 dmz_nr_unmap_seq_zones(zmd, i));
2986 }
2987 dmz_zmd_debug(zmd, " %u reserved sequential data zones",
2988 zmd->nr_reserved_seq);
2989 dmz_zmd_debug(zmd, "Format:");
2990 dmz_zmd_debug(zmd, "%u metadata blocks per set (%u max cache)",
2991 zmd->nr_meta_blocks, zmd->max_nr_mblks);
2992 dmz_zmd_debug(zmd, " %u data zone mapping blocks",
2993 zmd->nr_map_blocks);
2994 dmz_zmd_debug(zmd, " %u bitmap blocks",
2995 zmd->nr_bitmap_blocks);
2996
2997 *metadata = zmd;
2998
2999 return 0;
3000err:
3001 dmz_cleanup_metadata(zmd);
3002 kfree(zmd);
3003 *metadata = NULL;
3004
3005 return ret;
3006}
3007
3008/*
3009 * Cleanup the zoned metadata resources.
3010 */
3011void dmz_dtr_metadata(struct dmz_metadata *zmd)
3012{
3013 unregister_shrinker(&zmd->mblk_shrinker);
3014 dmz_cleanup_metadata(zmd);
3015 kfree(zmd);
3016}
3017
3018/*
3019 * Check zone information on resume.
3020 */
3021int dmz_resume_metadata(struct dmz_metadata *zmd)
3022{
3023 struct dm_zone *zone;
3024 sector_t wp_block;
3025 unsigned int i;
3026 int ret;
3027
3028 /* Check zones */
3029 for (i = 0; i < zmd->nr_zones; i++) {
3030 zone = dmz_get(zmd, i);
3031 if (!zone) {
3032 dmz_zmd_err(zmd, "Unable to get zone %u", i);
3033 return -EIO;
3034 }
3035 wp_block = zone->wp_block;
3036
3037 ret = dmz_update_zone(zmd, zone);
3038 if (ret) {
3039 dmz_zmd_err(zmd, "Broken zone %u", i);
3040 return ret;
3041 }
3042
3043 if (dmz_is_offline(zone)) {
3044 dmz_zmd_warn(zmd, "Zone %u is offline", i);
3045 continue;
3046 }
3047
3048 /* Check write pointer */
3049 if (!dmz_is_seq(zone))
3050 zone->wp_block = 0;
3051 else if (zone->wp_block != wp_block) {
3052 dmz_zmd_err(zmd, "Zone %u: Invalid wp (%llu / %llu)",
3053 i, (u64)zone->wp_block, (u64)wp_block);
3054 zone->wp_block = wp_block;
3055 dmz_invalidate_blocks(zmd, zone, zone->wp_block,
3056 zmd->zone_nr_blocks - zone->wp_block);
3057 }
3058 }
3059
3060 return 0;
3061}