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bae9a0aa | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3b1a94c8 DLM |
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> | |
bd976e52 | 12 | #include <linux/sched/mm.h> |
3b1a94c8 DLM |
13 | |
14 | #define DM_MSG_PREFIX "zoned metadata" | |
15 | ||
16 | /* | |
17 | * Metadata version. | |
18 | */ | |
19 | #define DMZ_META_VER 1 | |
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) | |
ad1bd578 | 38 | * All metadata blocks are stored in conventional zones, starting from |
3b1a94c8 DLM |
39 | * the first conventional zone found on disk. |
40 | */ | |
41 | struct 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 | /* Padding to full 512B sector */ | |
73 | u8 reserved[464]; /* 512 */ | |
74 | }; | |
75 | ||
76 | /* | |
77 | * Chunk mapping entry: entries are indexed by chunk number | |
78 | * and give the zone ID (dzone_id) mapping the chunk on disk. | |
79 | * This zone may be sequential or random. If it is a sequential | |
80 | * zone, a second zone (bzone_id) used as a write buffer may | |
81 | * also be specified. This second zone will always be a randomly | |
82 | * writeable zone. | |
83 | */ | |
84 | struct dmz_map { | |
85 | __le32 dzone_id; | |
86 | __le32 bzone_id; | |
87 | }; | |
88 | ||
89 | /* | |
90 | * Chunk mapping table metadata: 512 8-bytes entries per 4KB block. | |
91 | */ | |
92 | #define DMZ_MAP_ENTRIES (DMZ_BLOCK_SIZE / sizeof(struct dmz_map)) | |
93 | #define DMZ_MAP_ENTRIES_SHIFT (ilog2(DMZ_MAP_ENTRIES)) | |
94 | #define DMZ_MAP_ENTRIES_MASK (DMZ_MAP_ENTRIES - 1) | |
95 | #define DMZ_MAP_UNMAPPED UINT_MAX | |
96 | ||
97 | /* | |
98 | * Meta data block descriptor (for cached metadata blocks). | |
99 | */ | |
100 | struct dmz_mblock { | |
101 | struct rb_node node; | |
102 | struct list_head link; | |
103 | sector_t no; | |
33c2865f | 104 | unsigned int ref; |
3b1a94c8 DLM |
105 | unsigned long state; |
106 | struct page *page; | |
107 | void *data; | |
108 | }; | |
109 | ||
110 | /* | |
111 | * Metadata block state flags. | |
112 | */ | |
113 | enum { | |
114 | DMZ_META_DIRTY, | |
115 | DMZ_META_READING, | |
116 | DMZ_META_WRITING, | |
117 | DMZ_META_ERROR, | |
118 | }; | |
119 | ||
120 | /* | |
121 | * Super block information (one per metadata set). | |
122 | */ | |
123 | struct dmz_sb { | |
124 | sector_t block; | |
bf28a3ba | 125 | struct dmz_dev *dev; |
3b1a94c8 DLM |
126 | struct dmz_mblock *mblk; |
127 | struct dmz_super *sb; | |
735bd7e4 | 128 | struct dm_zone *zone; |
3b1a94c8 DLM |
129 | }; |
130 | ||
131 | /* | |
132 | * In-memory metadata. | |
133 | */ | |
134 | struct dmz_metadata { | |
135 | struct dmz_dev *dev; | |
136 | ||
2234e732 HR |
137 | char devname[BDEVNAME_SIZE]; |
138 | ||
3b1a94c8 DLM |
139 | sector_t zone_bitmap_size; |
140 | unsigned int zone_nr_bitmap_blocks; | |
b3996295 | 141 | unsigned int zone_bits_per_mblk; |
3b1a94c8 | 142 | |
36820560 HR |
143 | sector_t zone_nr_blocks; |
144 | sector_t zone_nr_blocks_shift; | |
145 | ||
146 | sector_t zone_nr_sectors; | |
147 | sector_t zone_nr_sectors_shift; | |
148 | ||
3b1a94c8 DLM |
149 | unsigned int nr_bitmap_blocks; |
150 | unsigned int nr_map_blocks; | |
151 | ||
36820560 | 152 | unsigned int nr_zones; |
3b1a94c8 DLM |
153 | unsigned int nr_useable_zones; |
154 | unsigned int nr_meta_blocks; | |
155 | unsigned int nr_meta_zones; | |
156 | unsigned int nr_data_zones; | |
157 | unsigned int nr_rnd_zones; | |
158 | unsigned int nr_reserved_seq; | |
159 | unsigned int nr_chunks; | |
160 | ||
161 | /* Zone information array */ | |
162 | struct dm_zone *zones; | |
163 | ||
3b1a94c8 DLM |
164 | struct dmz_sb sb[2]; |
165 | unsigned int mblk_primary; | |
166 | u64 sb_gen; | |
167 | unsigned int min_nr_mblks; | |
168 | unsigned int max_nr_mblks; | |
169 | atomic_t nr_mblks; | |
170 | struct rw_semaphore mblk_sem; | |
171 | struct mutex mblk_flush_lock; | |
172 | spinlock_t mblk_lock; | |
173 | struct rb_root mblk_rbtree; | |
174 | struct list_head mblk_lru_list; | |
175 | struct list_head mblk_dirty_list; | |
176 | struct shrinker mblk_shrinker; | |
177 | ||
178 | /* Zone allocation management */ | |
179 | struct mutex map_lock; | |
180 | struct dmz_mblock **map_mblk; | |
181 | unsigned int nr_rnd; | |
182 | atomic_t unmap_nr_rnd; | |
183 | struct list_head unmap_rnd_list; | |
184 | struct list_head map_rnd_list; | |
185 | ||
186 | unsigned int nr_seq; | |
187 | atomic_t unmap_nr_seq; | |
188 | struct list_head unmap_seq_list; | |
189 | struct list_head map_seq_list; | |
190 | ||
191 | atomic_t nr_reserved_seq_zones; | |
192 | struct list_head reserved_seq_zones_list; | |
193 | ||
194 | wait_queue_head_t free_wq; | |
195 | }; | |
196 | ||
197 | /* | |
198 | * Various accessors | |
199 | */ | |
3b1a94c8 DLM |
200 | sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone) |
201 | { | |
36820560 | 202 | return (sector_t)zone->id << zmd->zone_nr_sectors_shift; |
3b1a94c8 DLM |
203 | } |
204 | ||
205 | sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone) | |
206 | { | |
36820560 | 207 | return (sector_t)zone->id << zmd->zone_nr_blocks_shift; |
3b1a94c8 DLM |
208 | } |
209 | ||
bf28a3ba HR |
210 | struct dmz_dev *dmz_zone_to_dev(struct dmz_metadata *zmd, struct dm_zone *zone) |
211 | { | |
212 | return &zmd->dev[0]; | |
213 | } | |
214 | ||
36820560 HR |
215 | unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd) |
216 | { | |
217 | return zmd->zone_nr_blocks; | |
218 | } | |
219 | ||
220 | unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd) | |
221 | { | |
222 | return zmd->zone_nr_blocks_shift; | |
223 | } | |
224 | ||
225 | unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd) | |
226 | { | |
227 | return zmd->zone_nr_sectors; | |
228 | } | |
229 | ||
230 | unsigned int dmz_zone_nr_sectors_shift(struct dmz_metadata *zmd) | |
231 | { | |
232 | return zmd->zone_nr_sectors_shift; | |
233 | } | |
234 | ||
bc3d5717 HR |
235 | unsigned int dmz_nr_zones(struct dmz_metadata *zmd) |
236 | { | |
36820560 | 237 | return zmd->nr_zones; |
bc3d5717 HR |
238 | } |
239 | ||
3b1a94c8 DLM |
240 | unsigned int dmz_nr_chunks(struct dmz_metadata *zmd) |
241 | { | |
242 | return zmd->nr_chunks; | |
243 | } | |
244 | ||
245 | unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd) | |
246 | { | |
247 | return zmd->nr_rnd; | |
248 | } | |
249 | ||
250 | unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd) | |
251 | { | |
252 | return atomic_read(&zmd->unmap_nr_rnd); | |
253 | } | |
254 | ||
bc3d5717 HR |
255 | unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd) |
256 | { | |
257 | return zmd->nr_seq; | |
258 | } | |
259 | ||
260 | unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd) | |
261 | { | |
262 | return atomic_read(&zmd->unmap_nr_seq); | |
263 | } | |
264 | ||
2234e732 HR |
265 | const char *dmz_metadata_label(struct dmz_metadata *zmd) |
266 | { | |
267 | return (const char *)zmd->devname; | |
268 | } | |
269 | ||
d0e21ce4 HR |
270 | bool dmz_check_dev(struct dmz_metadata *zmd) |
271 | { | |
272 | return dmz_check_bdev(&zmd->dev[0]); | |
273 | } | |
274 | ||
275 | bool dmz_dev_is_dying(struct dmz_metadata *zmd) | |
276 | { | |
277 | return dmz_bdev_is_dying(&zmd->dev[0]); | |
278 | } | |
279 | ||
3b1a94c8 DLM |
280 | /* |
281 | * Lock/unlock mapping table. | |
282 | * The map lock also protects all the zone lists. | |
283 | */ | |
284 | void dmz_lock_map(struct dmz_metadata *zmd) | |
285 | { | |
286 | mutex_lock(&zmd->map_lock); | |
287 | } | |
288 | ||
289 | void dmz_unlock_map(struct dmz_metadata *zmd) | |
290 | { | |
291 | mutex_unlock(&zmd->map_lock); | |
292 | } | |
293 | ||
294 | /* | |
295 | * Lock/unlock metadata access. This is a "read" lock on a semaphore | |
296 | * that prevents metadata flush from running while metadata are being | |
297 | * modified. The actual metadata write mutual exclusion is achieved with | |
ad1bd578 | 298 | * the map lock and zone state management (active and reclaim state are |
3b1a94c8 DLM |
299 | * mutually exclusive). |
300 | */ | |
301 | void dmz_lock_metadata(struct dmz_metadata *zmd) | |
302 | { | |
303 | down_read(&zmd->mblk_sem); | |
304 | } | |
305 | ||
306 | void dmz_unlock_metadata(struct dmz_metadata *zmd) | |
307 | { | |
308 | up_read(&zmd->mblk_sem); | |
309 | } | |
310 | ||
311 | /* | |
312 | * Lock/unlock flush: prevent concurrent executions | |
313 | * of dmz_flush_metadata as well as metadata modification in reclaim | |
314 | * while flush is being executed. | |
315 | */ | |
316 | void dmz_lock_flush(struct dmz_metadata *zmd) | |
317 | { | |
318 | mutex_lock(&zmd->mblk_flush_lock); | |
319 | } | |
320 | ||
321 | void dmz_unlock_flush(struct dmz_metadata *zmd) | |
322 | { | |
323 | mutex_unlock(&zmd->mblk_flush_lock); | |
324 | } | |
325 | ||
326 | /* | |
327 | * Allocate a metadata block. | |
328 | */ | |
329 | static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd, | |
330 | sector_t mblk_no) | |
331 | { | |
332 | struct dmz_mblock *mblk = NULL; | |
333 | ||
334 | /* See if we can reuse cached blocks */ | |
335 | if (zmd->max_nr_mblks && atomic_read(&zmd->nr_mblks) > zmd->max_nr_mblks) { | |
336 | spin_lock(&zmd->mblk_lock); | |
337 | mblk = list_first_entry_or_null(&zmd->mblk_lru_list, | |
338 | struct dmz_mblock, link); | |
339 | if (mblk) { | |
340 | list_del_init(&mblk->link); | |
341 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
342 | mblk->no = mblk_no; | |
343 | } | |
344 | spin_unlock(&zmd->mblk_lock); | |
345 | if (mblk) | |
346 | return mblk; | |
347 | } | |
348 | ||
349 | /* Allocate a new block */ | |
350 | mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO); | |
351 | if (!mblk) | |
352 | return NULL; | |
353 | ||
354 | mblk->page = alloc_page(GFP_NOIO); | |
355 | if (!mblk->page) { | |
356 | kfree(mblk); | |
357 | return NULL; | |
358 | } | |
359 | ||
360 | RB_CLEAR_NODE(&mblk->node); | |
361 | INIT_LIST_HEAD(&mblk->link); | |
33c2865f | 362 | mblk->ref = 0; |
3b1a94c8 DLM |
363 | mblk->state = 0; |
364 | mblk->no = mblk_no; | |
365 | mblk->data = page_address(mblk->page); | |
366 | ||
367 | atomic_inc(&zmd->nr_mblks); | |
368 | ||
369 | return mblk; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Free a metadata block. | |
374 | */ | |
375 | static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) | |
376 | { | |
377 | __free_pages(mblk->page, 0); | |
378 | kfree(mblk); | |
379 | ||
380 | atomic_dec(&zmd->nr_mblks); | |
381 | } | |
382 | ||
383 | /* | |
384 | * Insert a metadata block in the rbtree. | |
385 | */ | |
386 | static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) | |
387 | { | |
388 | struct rb_root *root = &zmd->mblk_rbtree; | |
389 | struct rb_node **new = &(root->rb_node), *parent = NULL; | |
390 | struct dmz_mblock *b; | |
391 | ||
392 | /* Figure out where to put the new node */ | |
393 | while (*new) { | |
394 | b = container_of(*new, struct dmz_mblock, node); | |
395 | parent = *new; | |
396 | new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right); | |
397 | } | |
398 | ||
399 | /* Add new node and rebalance tree */ | |
400 | rb_link_node(&mblk->node, parent, new); | |
401 | rb_insert_color(&mblk->node, root); | |
402 | } | |
403 | ||
404 | /* | |
3d4e7383 DLM |
405 | * Lookup a metadata block in the rbtree. If the block is found, increment |
406 | * its reference count. | |
3b1a94c8 | 407 | */ |
3d4e7383 DLM |
408 | static struct dmz_mblock *dmz_get_mblock_fast(struct dmz_metadata *zmd, |
409 | sector_t mblk_no) | |
3b1a94c8 DLM |
410 | { |
411 | struct rb_root *root = &zmd->mblk_rbtree; | |
412 | struct rb_node *node = root->rb_node; | |
413 | struct dmz_mblock *mblk; | |
414 | ||
415 | while (node) { | |
416 | mblk = container_of(node, struct dmz_mblock, node); | |
3d4e7383 DLM |
417 | if (mblk->no == mblk_no) { |
418 | /* | |
419 | * If this is the first reference to the block, | |
420 | * remove it from the LRU list. | |
421 | */ | |
422 | mblk->ref++; | |
423 | if (mblk->ref == 1 && | |
424 | !test_bit(DMZ_META_DIRTY, &mblk->state)) | |
425 | list_del_init(&mblk->link); | |
3b1a94c8 | 426 | return mblk; |
3d4e7383 | 427 | } |
3b1a94c8 DLM |
428 | node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right; |
429 | } | |
430 | ||
431 | return NULL; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Metadata block BIO end callback. | |
436 | */ | |
437 | static void dmz_mblock_bio_end_io(struct bio *bio) | |
438 | { | |
439 | struct dmz_mblock *mblk = bio->bi_private; | |
440 | int flag; | |
441 | ||
442 | if (bio->bi_status) | |
443 | set_bit(DMZ_META_ERROR, &mblk->state); | |
444 | ||
445 | if (bio_op(bio) == REQ_OP_WRITE) | |
446 | flag = DMZ_META_WRITING; | |
447 | else | |
448 | flag = DMZ_META_READING; | |
449 | ||
450 | clear_bit_unlock(flag, &mblk->state); | |
451 | smp_mb__after_atomic(); | |
452 | wake_up_bit(&mblk->state, flag); | |
453 | ||
454 | bio_put(bio); | |
455 | } | |
456 | ||
457 | /* | |
3d4e7383 | 458 | * Read an uncached metadata block from disk and add it to the cache. |
3b1a94c8 | 459 | */ |
3d4e7383 DLM |
460 | static struct dmz_mblock *dmz_get_mblock_slow(struct dmz_metadata *zmd, |
461 | sector_t mblk_no) | |
3b1a94c8 | 462 | { |
3d4e7383 | 463 | struct dmz_mblock *mblk, *m; |
3b1a94c8 | 464 | sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no; |
bf28a3ba | 465 | struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev; |
3b1a94c8 DLM |
466 | struct bio *bio; |
467 | ||
bf28a3ba | 468 | if (dmz_bdev_is_dying(dev)) |
75d66ffb DF |
469 | return ERR_PTR(-EIO); |
470 | ||
3d4e7383 | 471 | /* Get a new block and a BIO to read it */ |
3b1a94c8 DLM |
472 | mblk = dmz_alloc_mblock(zmd, mblk_no); |
473 | if (!mblk) | |
75d66ffb | 474 | return ERR_PTR(-ENOMEM); |
3b1a94c8 | 475 | |
3b1a94c8 DLM |
476 | bio = bio_alloc(GFP_NOIO, 1); |
477 | if (!bio) { | |
478 | dmz_free_mblock(zmd, mblk); | |
75d66ffb | 479 | return ERR_PTR(-ENOMEM); |
3b1a94c8 DLM |
480 | } |
481 | ||
3d4e7383 DLM |
482 | spin_lock(&zmd->mblk_lock); |
483 | ||
484 | /* | |
485 | * Make sure that another context did not start reading | |
486 | * the block already. | |
487 | */ | |
488 | m = dmz_get_mblock_fast(zmd, mblk_no); | |
489 | if (m) { | |
490 | spin_unlock(&zmd->mblk_lock); | |
491 | dmz_free_mblock(zmd, mblk); | |
492 | bio_put(bio); | |
493 | return m; | |
494 | } | |
495 | ||
496 | mblk->ref++; | |
497 | set_bit(DMZ_META_READING, &mblk->state); | |
498 | dmz_insert_mblock(zmd, mblk); | |
499 | ||
500 | spin_unlock(&zmd->mblk_lock); | |
501 | ||
502 | /* Submit read BIO */ | |
3b1a94c8 | 503 | bio->bi_iter.bi_sector = dmz_blk2sect(block); |
bf28a3ba | 504 | bio_set_dev(bio, dev->bdev); |
3b1a94c8 DLM |
505 | bio->bi_private = mblk; |
506 | bio->bi_end_io = dmz_mblock_bio_end_io; | |
507 | bio_set_op_attrs(bio, REQ_OP_READ, REQ_META | REQ_PRIO); | |
508 | bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); | |
509 | submit_bio(bio); | |
510 | ||
511 | return mblk; | |
512 | } | |
513 | ||
514 | /* | |
515 | * Free metadata blocks. | |
516 | */ | |
517 | static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd, | |
518 | unsigned long limit) | |
519 | { | |
520 | struct dmz_mblock *mblk; | |
521 | unsigned long count = 0; | |
522 | ||
523 | if (!zmd->max_nr_mblks) | |
524 | return 0; | |
525 | ||
526 | while (!list_empty(&zmd->mblk_lru_list) && | |
527 | atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks && | |
528 | count < limit) { | |
529 | mblk = list_first_entry(&zmd->mblk_lru_list, | |
530 | struct dmz_mblock, link); | |
531 | list_del_init(&mblk->link); | |
532 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
533 | dmz_free_mblock(zmd, mblk); | |
534 | count++; | |
535 | } | |
536 | ||
537 | return count; | |
538 | } | |
539 | ||
540 | /* | |
541 | * For mblock shrinker: get the number of unused metadata blocks in the cache. | |
542 | */ | |
543 | static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink, | |
544 | struct shrink_control *sc) | |
545 | { | |
546 | struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); | |
547 | ||
548 | return atomic_read(&zmd->nr_mblks); | |
549 | } | |
550 | ||
551 | /* | |
552 | * For mblock shrinker: scan unused metadata blocks and shrink the cache. | |
553 | */ | |
554 | static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink, | |
555 | struct shrink_control *sc) | |
556 | { | |
557 | struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); | |
558 | unsigned long count; | |
559 | ||
560 | spin_lock(&zmd->mblk_lock); | |
561 | count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan); | |
562 | spin_unlock(&zmd->mblk_lock); | |
563 | ||
564 | return count ? count : SHRINK_STOP; | |
565 | } | |
566 | ||
567 | /* | |
568 | * Release a metadata block. | |
569 | */ | |
570 | static void dmz_release_mblock(struct dmz_metadata *zmd, | |
571 | struct dmz_mblock *mblk) | |
572 | { | |
573 | ||
574 | if (!mblk) | |
575 | return; | |
576 | ||
577 | spin_lock(&zmd->mblk_lock); | |
578 | ||
33c2865f DLM |
579 | mblk->ref--; |
580 | if (mblk->ref == 0) { | |
3b1a94c8 DLM |
581 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { |
582 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
583 | dmz_free_mblock(zmd, mblk); | |
584 | } else if (!test_bit(DMZ_META_DIRTY, &mblk->state)) { | |
585 | list_add_tail(&mblk->link, &zmd->mblk_lru_list); | |
586 | dmz_shrink_mblock_cache(zmd, 1); | |
587 | } | |
588 | } | |
589 | ||
590 | spin_unlock(&zmd->mblk_lock); | |
591 | } | |
592 | ||
593 | /* | |
594 | * Get a metadata block from the rbtree. If the block | |
595 | * is not present, read it from disk. | |
596 | */ | |
597 | static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd, | |
598 | sector_t mblk_no) | |
599 | { | |
600 | struct dmz_mblock *mblk; | |
bf28a3ba | 601 | struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev; |
3b1a94c8 DLM |
602 | |
603 | /* Check rbtree */ | |
604 | spin_lock(&zmd->mblk_lock); | |
3d4e7383 | 605 | mblk = dmz_get_mblock_fast(zmd, mblk_no); |
3b1a94c8 DLM |
606 | spin_unlock(&zmd->mblk_lock); |
607 | ||
608 | if (!mblk) { | |
609 | /* Cache miss: read the block from disk */ | |
3d4e7383 | 610 | mblk = dmz_get_mblock_slow(zmd, mblk_no); |
75d66ffb DF |
611 | if (IS_ERR(mblk)) |
612 | return mblk; | |
3b1a94c8 DLM |
613 | } |
614 | ||
615 | /* Wait for on-going read I/O and check for error */ | |
616 | wait_on_bit_io(&mblk->state, DMZ_META_READING, | |
617 | TASK_UNINTERRUPTIBLE); | |
618 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { | |
619 | dmz_release_mblock(zmd, mblk); | |
bf28a3ba | 620 | dmz_check_bdev(dev); |
3b1a94c8 DLM |
621 | return ERR_PTR(-EIO); |
622 | } | |
623 | ||
624 | return mblk; | |
625 | } | |
626 | ||
627 | /* | |
628 | * Mark a metadata block dirty. | |
629 | */ | |
630 | static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) | |
631 | { | |
632 | spin_lock(&zmd->mblk_lock); | |
633 | if (!test_and_set_bit(DMZ_META_DIRTY, &mblk->state)) | |
634 | list_add_tail(&mblk->link, &zmd->mblk_dirty_list); | |
635 | spin_unlock(&zmd->mblk_lock); | |
636 | } | |
637 | ||
638 | /* | |
639 | * Issue a metadata block write BIO. | |
640 | */ | |
75d66ffb DF |
641 | static int dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk, |
642 | unsigned int set) | |
3b1a94c8 | 643 | { |
bf28a3ba | 644 | struct dmz_dev *dev = zmd->sb[set].dev; |
3b1a94c8 DLM |
645 | sector_t block = zmd->sb[set].block + mblk->no; |
646 | struct bio *bio; | |
647 | ||
bf28a3ba | 648 | if (dmz_bdev_is_dying(dev)) |
75d66ffb DF |
649 | return -EIO; |
650 | ||
3b1a94c8 DLM |
651 | bio = bio_alloc(GFP_NOIO, 1); |
652 | if (!bio) { | |
653 | set_bit(DMZ_META_ERROR, &mblk->state); | |
75d66ffb | 654 | return -ENOMEM; |
3b1a94c8 DLM |
655 | } |
656 | ||
657 | set_bit(DMZ_META_WRITING, &mblk->state); | |
658 | ||
659 | bio->bi_iter.bi_sector = dmz_blk2sect(block); | |
bf28a3ba | 660 | bio_set_dev(bio, dev->bdev); |
3b1a94c8 DLM |
661 | bio->bi_private = mblk; |
662 | bio->bi_end_io = dmz_mblock_bio_end_io; | |
663 | bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_META | REQ_PRIO); | |
664 | bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); | |
665 | submit_bio(bio); | |
75d66ffb DF |
666 | |
667 | return 0; | |
3b1a94c8 DLM |
668 | } |
669 | ||
670 | /* | |
671 | * Read/write a metadata block. | |
672 | */ | |
bf28a3ba HR |
673 | static int dmz_rdwr_block(struct dmz_dev *dev, int op, |
674 | sector_t block, struct page *page) | |
3b1a94c8 DLM |
675 | { |
676 | struct bio *bio; | |
677 | int ret; | |
678 | ||
bf28a3ba | 679 | if (dmz_bdev_is_dying(dev)) |
75d66ffb DF |
680 | return -EIO; |
681 | ||
3b1a94c8 DLM |
682 | bio = bio_alloc(GFP_NOIO, 1); |
683 | if (!bio) | |
684 | return -ENOMEM; | |
685 | ||
686 | bio->bi_iter.bi_sector = dmz_blk2sect(block); | |
bf28a3ba | 687 | bio_set_dev(bio, dev->bdev); |
3b1a94c8 DLM |
688 | bio_set_op_attrs(bio, op, REQ_SYNC | REQ_META | REQ_PRIO); |
689 | bio_add_page(bio, page, DMZ_BLOCK_SIZE, 0); | |
690 | ret = submit_bio_wait(bio); | |
691 | bio_put(bio); | |
692 | ||
e7fad909 | 693 | if (ret) |
bf28a3ba | 694 | dmz_check_bdev(dev); |
3b1a94c8 DLM |
695 | return ret; |
696 | } | |
697 | ||
698 | /* | |
699 | * Write super block of the specified metadata set. | |
700 | */ | |
701 | static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set) | |
702 | { | |
703 | sector_t block = zmd->sb[set].block; | |
704 | struct dmz_mblock *mblk = zmd->sb[set].mblk; | |
705 | struct dmz_super *sb = zmd->sb[set].sb; | |
bf28a3ba | 706 | struct dmz_dev *dev = zmd->sb[set].dev; |
3b1a94c8 DLM |
707 | u64 sb_gen = zmd->sb_gen + 1; |
708 | int ret; | |
709 | ||
710 | sb->magic = cpu_to_le32(DMZ_MAGIC); | |
711 | sb->version = cpu_to_le32(DMZ_META_VER); | |
712 | ||
713 | sb->gen = cpu_to_le64(sb_gen); | |
714 | ||
715 | sb->sb_block = cpu_to_le64(block); | |
716 | sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks); | |
717 | sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq); | |
718 | sb->nr_chunks = cpu_to_le32(zmd->nr_chunks); | |
719 | ||
720 | sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks); | |
721 | sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks); | |
722 | ||
723 | sb->crc = 0; | |
724 | sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE)); | |
725 | ||
bf28a3ba | 726 | ret = dmz_rdwr_block(dev, REQ_OP_WRITE, block, mblk->page); |
3b1a94c8 | 727 | if (ret == 0) |
bf28a3ba | 728 | ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL); |
3b1a94c8 DLM |
729 | |
730 | return ret; | |
731 | } | |
732 | ||
733 | /* | |
734 | * Write dirty metadata blocks to the specified set. | |
735 | */ | |
736 | static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd, | |
737 | struct list_head *write_list, | |
738 | unsigned int set) | |
739 | { | |
740 | struct dmz_mblock *mblk; | |
bf28a3ba | 741 | struct dmz_dev *dev = zmd->sb[set].dev; |
3b1a94c8 | 742 | struct blk_plug plug; |
75d66ffb | 743 | int ret = 0, nr_mblks_submitted = 0; |
3b1a94c8 DLM |
744 | |
745 | /* Issue writes */ | |
746 | blk_start_plug(&plug); | |
75d66ffb DF |
747 | list_for_each_entry(mblk, write_list, link) { |
748 | ret = dmz_write_mblock(zmd, mblk, set); | |
749 | if (ret) | |
750 | break; | |
751 | nr_mblks_submitted++; | |
752 | } | |
3b1a94c8 DLM |
753 | blk_finish_plug(&plug); |
754 | ||
755 | /* Wait for completion */ | |
756 | list_for_each_entry(mblk, write_list, link) { | |
75d66ffb DF |
757 | if (!nr_mblks_submitted) |
758 | break; | |
3b1a94c8 DLM |
759 | wait_on_bit_io(&mblk->state, DMZ_META_WRITING, |
760 | TASK_UNINTERRUPTIBLE); | |
761 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { | |
762 | clear_bit(DMZ_META_ERROR, &mblk->state); | |
bf28a3ba | 763 | dmz_check_bdev(dev); |
3b1a94c8 DLM |
764 | ret = -EIO; |
765 | } | |
75d66ffb | 766 | nr_mblks_submitted--; |
3b1a94c8 DLM |
767 | } |
768 | ||
769 | /* Flush drive cache (this will also sync data) */ | |
770 | if (ret == 0) | |
bf28a3ba | 771 | ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL); |
3b1a94c8 DLM |
772 | |
773 | return ret; | |
774 | } | |
775 | ||
776 | /* | |
777 | * Log dirty metadata blocks. | |
778 | */ | |
779 | static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd, | |
780 | struct list_head *write_list) | |
781 | { | |
782 | unsigned int log_set = zmd->mblk_primary ^ 0x1; | |
783 | int ret; | |
784 | ||
785 | /* Write dirty blocks to the log */ | |
786 | ret = dmz_write_dirty_mblocks(zmd, write_list, log_set); | |
787 | if (ret) | |
788 | return ret; | |
789 | ||
790 | /* | |
791 | * No error so far: now validate the log by updating the | |
792 | * log index super block generation. | |
793 | */ | |
794 | ret = dmz_write_sb(zmd, log_set); | |
795 | if (ret) | |
796 | return ret; | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
801 | /* | |
802 | * Flush dirty metadata blocks. | |
803 | */ | |
804 | int dmz_flush_metadata(struct dmz_metadata *zmd) | |
805 | { | |
806 | struct dmz_mblock *mblk; | |
807 | struct list_head write_list; | |
bf28a3ba | 808 | struct dmz_dev *dev; |
3b1a94c8 DLM |
809 | int ret; |
810 | ||
811 | if (WARN_ON(!zmd)) | |
812 | return 0; | |
813 | ||
814 | INIT_LIST_HEAD(&write_list); | |
815 | ||
816 | /* | |
817 | * Make sure that metadata blocks are stable before logging: take | |
818 | * the write lock on the metadata semaphore to prevent target BIOs | |
819 | * from modifying metadata. | |
820 | */ | |
821 | down_write(&zmd->mblk_sem); | |
bf28a3ba | 822 | dev = zmd->sb[zmd->mblk_primary].dev; |
3b1a94c8 DLM |
823 | |
824 | /* | |
825 | * This is called from the target flush work and reclaim work. | |
826 | * Concurrent execution is not allowed. | |
827 | */ | |
828 | dmz_lock_flush(zmd); | |
829 | ||
bf28a3ba | 830 | if (dmz_bdev_is_dying(dev)) { |
75d66ffb DF |
831 | ret = -EIO; |
832 | goto out; | |
833 | } | |
834 | ||
3b1a94c8 DLM |
835 | /* Get dirty blocks */ |
836 | spin_lock(&zmd->mblk_lock); | |
837 | list_splice_init(&zmd->mblk_dirty_list, &write_list); | |
838 | spin_unlock(&zmd->mblk_lock); | |
839 | ||
840 | /* If there are no dirty metadata blocks, just flush the device cache */ | |
841 | if (list_empty(&write_list)) { | |
bf28a3ba | 842 | ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL); |
e7fad909 | 843 | goto err; |
3b1a94c8 DLM |
844 | } |
845 | ||
846 | /* | |
847 | * The primary metadata set is still clean. Keep it this way until | |
848 | * all updates are successful in the secondary set. That is, use | |
849 | * the secondary set as a log. | |
850 | */ | |
851 | ret = dmz_log_dirty_mblocks(zmd, &write_list); | |
852 | if (ret) | |
e7fad909 | 853 | goto err; |
3b1a94c8 DLM |
854 | |
855 | /* | |
856 | * The log is on disk. It is now safe to update in place | |
857 | * in the primary metadata set. | |
858 | */ | |
859 | ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary); | |
860 | if (ret) | |
e7fad909 | 861 | goto err; |
3b1a94c8 DLM |
862 | |
863 | ret = dmz_write_sb(zmd, zmd->mblk_primary); | |
864 | if (ret) | |
e7fad909 | 865 | goto err; |
3b1a94c8 DLM |
866 | |
867 | while (!list_empty(&write_list)) { | |
868 | mblk = list_first_entry(&write_list, struct dmz_mblock, link); | |
869 | list_del_init(&mblk->link); | |
870 | ||
871 | spin_lock(&zmd->mblk_lock); | |
872 | clear_bit(DMZ_META_DIRTY, &mblk->state); | |
33c2865f | 873 | if (mblk->ref == 0) |
3b1a94c8 DLM |
874 | list_add_tail(&mblk->link, &zmd->mblk_lru_list); |
875 | spin_unlock(&zmd->mblk_lock); | |
876 | } | |
877 | ||
878 | zmd->sb_gen++; | |
879 | out: | |
3b1a94c8 DLM |
880 | dmz_unlock_flush(zmd); |
881 | up_write(&zmd->mblk_sem); | |
882 | ||
883 | return ret; | |
e7fad909 DF |
884 | |
885 | err: | |
886 | if (!list_empty(&write_list)) { | |
887 | spin_lock(&zmd->mblk_lock); | |
888 | list_splice(&write_list, &zmd->mblk_dirty_list); | |
889 | spin_unlock(&zmd->mblk_lock); | |
890 | } | |
bf28a3ba | 891 | if (!dmz_check_bdev(dev)) |
e7fad909 DF |
892 | ret = -EIO; |
893 | goto out; | |
3b1a94c8 DLM |
894 | } |
895 | ||
896 | /* | |
897 | * Check super block. | |
898 | */ | |
735bd7e4 | 899 | static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set) |
3b1a94c8 | 900 | { |
735bd7e4 | 901 | struct dmz_super *sb = zmd->sb[set].sb; |
bf28a3ba | 902 | struct dmz_dev *dev = zmd->sb[set].dev; |
3b1a94c8 | 903 | unsigned int nr_meta_zones, nr_data_zones; |
3b1a94c8 DLM |
904 | u32 crc, stored_crc; |
905 | u64 gen; | |
906 | ||
907 | gen = le64_to_cpu(sb->gen); | |
908 | stored_crc = le32_to_cpu(sb->crc); | |
909 | sb->crc = 0; | |
910 | crc = crc32_le(gen, (unsigned char *)sb, DMZ_BLOCK_SIZE); | |
911 | if (crc != stored_crc) { | |
912 | dmz_dev_err(dev, "Invalid checksum (needed 0x%08x, got 0x%08x)", | |
913 | crc, stored_crc); | |
914 | return -ENXIO; | |
915 | } | |
916 | ||
917 | if (le32_to_cpu(sb->magic) != DMZ_MAGIC) { | |
918 | dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)", | |
919 | DMZ_MAGIC, le32_to_cpu(sb->magic)); | |
920 | return -ENXIO; | |
921 | } | |
922 | ||
923 | if (le32_to_cpu(sb->version) != DMZ_META_VER) { | |
924 | dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)", | |
925 | DMZ_META_VER, le32_to_cpu(sb->version)); | |
926 | return -ENXIO; | |
927 | } | |
928 | ||
36820560 HR |
929 | nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + zmd->zone_nr_blocks - 1) |
930 | >> zmd->zone_nr_blocks_shift; | |
3b1a94c8 DLM |
931 | if (!nr_meta_zones || |
932 | nr_meta_zones >= zmd->nr_rnd_zones) { | |
933 | dmz_dev_err(dev, "Invalid number of metadata blocks"); | |
934 | return -ENXIO; | |
935 | } | |
936 | ||
937 | if (!le32_to_cpu(sb->nr_reserved_seq) || | |
938 | le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) { | |
939 | dmz_dev_err(dev, "Invalid number of reserved sequential zones"); | |
940 | return -ENXIO; | |
941 | } | |
942 | ||
943 | nr_data_zones = zmd->nr_useable_zones - | |
944 | (nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq)); | |
945 | if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) { | |
946 | dmz_dev_err(dev, "Invalid number of chunks %u / %u", | |
947 | le32_to_cpu(sb->nr_chunks), nr_data_zones); | |
948 | return -ENXIO; | |
949 | } | |
950 | ||
951 | /* OK */ | |
952 | zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks); | |
953 | zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq); | |
954 | zmd->nr_chunks = le32_to_cpu(sb->nr_chunks); | |
955 | zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks); | |
956 | zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks); | |
957 | zmd->nr_meta_zones = nr_meta_zones; | |
958 | zmd->nr_data_zones = nr_data_zones; | |
959 | ||
960 | return 0; | |
961 | } | |
962 | ||
963 | /* | |
964 | * Read the first or second super block from disk. | |
965 | */ | |
966 | static int dmz_read_sb(struct dmz_metadata *zmd, unsigned int set) | |
967 | { | |
bf28a3ba HR |
968 | return dmz_rdwr_block(zmd->sb[set].dev, REQ_OP_READ, |
969 | zmd->sb[set].block, zmd->sb[set].mblk->page); | |
3b1a94c8 DLM |
970 | } |
971 | ||
972 | /* | |
973 | * Determine the position of the secondary super blocks on disk. | |
974 | * This is used only if a corruption of the primary super block | |
975 | * is detected. | |
976 | */ | |
977 | static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd) | |
978 | { | |
36820560 | 979 | unsigned int zone_nr_blocks = zmd->zone_nr_blocks; |
3b1a94c8 DLM |
980 | struct dmz_mblock *mblk; |
981 | int i; | |
982 | ||
983 | /* Allocate a block */ | |
984 | mblk = dmz_alloc_mblock(zmd, 0); | |
985 | if (!mblk) | |
986 | return -ENOMEM; | |
987 | ||
988 | zmd->sb[1].mblk = mblk; | |
989 | zmd->sb[1].sb = mblk->data; | |
990 | ||
991 | /* Bad first super block: search for the second one */ | |
992 | zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks; | |
735bd7e4 | 993 | zmd->sb[1].zone = zmd->sb[0].zone + 1; |
bf28a3ba | 994 | zmd->sb[1].dev = dmz_zone_to_dev(zmd, zmd->sb[1].zone); |
3b1a94c8 DLM |
995 | for (i = 0; i < zmd->nr_rnd_zones - 1; i++) { |
996 | if (dmz_read_sb(zmd, 1) != 0) | |
997 | break; | |
735bd7e4 HR |
998 | if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC) { |
999 | zmd->sb[1].zone += i; | |
3b1a94c8 | 1000 | return 0; |
735bd7e4 | 1001 | } |
3b1a94c8 | 1002 | zmd->sb[1].block += zone_nr_blocks; |
bf28a3ba | 1003 | zmd->sb[1].dev = dmz_zone_to_dev(zmd, zmd->sb[1].zone + i); |
3b1a94c8 DLM |
1004 | } |
1005 | ||
1006 | dmz_free_mblock(zmd, mblk); | |
1007 | zmd->sb[1].mblk = NULL; | |
735bd7e4 | 1008 | zmd->sb[1].zone = NULL; |
bf28a3ba | 1009 | zmd->sb[1].dev = NULL; |
3b1a94c8 DLM |
1010 | |
1011 | return -EIO; | |
1012 | } | |
1013 | ||
1014 | /* | |
1015 | * Read the first or second super block from disk. | |
1016 | */ | |
1017 | static int dmz_get_sb(struct dmz_metadata *zmd, unsigned int set) | |
1018 | { | |
1019 | struct dmz_mblock *mblk; | |
1020 | int ret; | |
1021 | ||
1022 | /* Allocate a block */ | |
1023 | mblk = dmz_alloc_mblock(zmd, 0); | |
1024 | if (!mblk) | |
1025 | return -ENOMEM; | |
1026 | ||
1027 | zmd->sb[set].mblk = mblk; | |
1028 | zmd->sb[set].sb = mblk->data; | |
1029 | ||
1030 | /* Read super block */ | |
1031 | ret = dmz_read_sb(zmd, set); | |
1032 | if (ret) { | |
1033 | dmz_free_mblock(zmd, mblk); | |
1034 | zmd->sb[set].mblk = NULL; | |
1035 | return ret; | |
1036 | } | |
1037 | ||
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * Recover a metadata set. | |
1043 | */ | |
1044 | static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set) | |
1045 | { | |
1046 | unsigned int src_set = dst_set ^ 0x1; | |
1047 | struct page *page; | |
1048 | int i, ret; | |
1049 | ||
bf28a3ba HR |
1050 | dmz_dev_warn(zmd->sb[dst_set].dev, |
1051 | "Metadata set %u invalid: recovering", dst_set); | |
3b1a94c8 DLM |
1052 | |
1053 | if (dst_set == 0) | |
735bd7e4 HR |
1054 | zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone); |
1055 | else | |
1056 | zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone); | |
3b1a94c8 | 1057 | |
4218a955 | 1058 | page = alloc_page(GFP_NOIO); |
3b1a94c8 DLM |
1059 | if (!page) |
1060 | return -ENOMEM; | |
1061 | ||
1062 | /* Copy metadata blocks */ | |
1063 | for (i = 1; i < zmd->nr_meta_blocks; i++) { | |
bf28a3ba | 1064 | ret = dmz_rdwr_block(zmd->sb[src_set].dev, REQ_OP_READ, |
3b1a94c8 DLM |
1065 | zmd->sb[src_set].block + i, page); |
1066 | if (ret) | |
1067 | goto out; | |
bf28a3ba | 1068 | ret = dmz_rdwr_block(zmd->sb[dst_set].dev, REQ_OP_WRITE, |
3b1a94c8 DLM |
1069 | zmd->sb[dst_set].block + i, page); |
1070 | if (ret) | |
1071 | goto out; | |
1072 | } | |
1073 | ||
1074 | /* Finalize with the super block */ | |
1075 | if (!zmd->sb[dst_set].mblk) { | |
1076 | zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0); | |
1077 | if (!zmd->sb[dst_set].mblk) { | |
1078 | ret = -ENOMEM; | |
1079 | goto out; | |
1080 | } | |
1081 | zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data; | |
1082 | } | |
1083 | ||
1084 | ret = dmz_write_sb(zmd, dst_set); | |
1085 | out: | |
1086 | __free_pages(page, 0); | |
1087 | ||
1088 | return ret; | |
1089 | } | |
1090 | ||
1091 | /* | |
1092 | * Get super block from disk. | |
1093 | */ | |
1094 | static int dmz_load_sb(struct dmz_metadata *zmd) | |
1095 | { | |
1096 | bool sb_good[2] = {false, false}; | |
1097 | u64 sb_gen[2] = {0, 0}; | |
1098 | int ret; | |
1099 | ||
735bd7e4 HR |
1100 | if (!zmd->sb[0].zone) { |
1101 | dmz_dev_err(zmd->dev, "Primary super block zone not set"); | |
1102 | return -ENXIO; | |
1103 | } | |
1104 | ||
3b1a94c8 | 1105 | /* Read and check the primary super block */ |
735bd7e4 | 1106 | zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone); |
bf28a3ba | 1107 | zmd->sb[0].dev = dmz_zone_to_dev(zmd, zmd->sb[0].zone); |
3b1a94c8 DLM |
1108 | ret = dmz_get_sb(zmd, 0); |
1109 | if (ret) { | |
bf28a3ba | 1110 | dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed"); |
3b1a94c8 DLM |
1111 | return ret; |
1112 | } | |
1113 | ||
735bd7e4 | 1114 | ret = dmz_check_sb(zmd, 0); |
3b1a94c8 DLM |
1115 | |
1116 | /* Read and check secondary super block */ | |
1117 | if (ret == 0) { | |
1118 | sb_good[0] = true; | |
735bd7e4 HR |
1119 | if (!zmd->sb[1].zone) |
1120 | zmd->sb[1].zone = zmd->sb[0].zone + zmd->nr_meta_zones; | |
1121 | zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone); | |
bf28a3ba | 1122 | zmd->sb[1].dev = dmz_zone_to_dev(zmd, zmd->sb[1].zone); |
3b1a94c8 DLM |
1123 | ret = dmz_get_sb(zmd, 1); |
1124 | } else | |
1125 | ret = dmz_lookup_secondary_sb(zmd); | |
1126 | ||
1127 | if (ret) { | |
bf28a3ba | 1128 | dmz_dev_err(zmd->sb[1].dev, "Read secondary super block failed"); |
3b1a94c8 DLM |
1129 | return ret; |
1130 | } | |
1131 | ||
735bd7e4 | 1132 | ret = dmz_check_sb(zmd, 1); |
3b1a94c8 DLM |
1133 | if (ret == 0) |
1134 | sb_good[1] = true; | |
1135 | ||
1136 | /* Use highest generation sb first */ | |
1137 | if (!sb_good[0] && !sb_good[1]) { | |
1138 | dmz_dev_err(zmd->dev, "No valid super block found"); | |
1139 | return -EIO; | |
1140 | } | |
1141 | ||
1142 | if (sb_good[0]) | |
1143 | sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen); | |
bf28a3ba | 1144 | else { |
3b1a94c8 | 1145 | ret = dmz_recover_mblocks(zmd, 0); |
bf28a3ba HR |
1146 | if (ret) { |
1147 | dmz_dev_err(zmd->sb[0].dev, | |
1148 | "Recovery of superblock 0 failed"); | |
1149 | return -EIO; | |
1150 | } | |
1151 | } | |
3b1a94c8 DLM |
1152 | |
1153 | if (sb_good[1]) | |
1154 | sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen); | |
bf28a3ba | 1155 | else { |
3b1a94c8 DLM |
1156 | ret = dmz_recover_mblocks(zmd, 1); |
1157 | ||
bf28a3ba HR |
1158 | if (ret) { |
1159 | dmz_dev_err(zmd->sb[1].dev, | |
1160 | "Recovery of superblock 1 failed"); | |
1161 | return -EIO; | |
1162 | } | |
3b1a94c8 DLM |
1163 | } |
1164 | ||
1165 | if (sb_gen[0] >= sb_gen[1]) { | |
1166 | zmd->sb_gen = sb_gen[0]; | |
1167 | zmd->mblk_primary = 0; | |
1168 | } else { | |
1169 | zmd->sb_gen = sb_gen[1]; | |
1170 | zmd->mblk_primary = 1; | |
1171 | } | |
1172 | ||
bf28a3ba HR |
1173 | dmz_dev_debug(zmd->sb[zmd->mblk_primary].dev, |
1174 | "Using super block %u (gen %llu)", | |
3b1a94c8 DLM |
1175 | zmd->mblk_primary, zmd->sb_gen); |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Initialize a zone descriptor. | |
1182 | */ | |
d4100351 | 1183 | static int dmz_init_zone(struct blk_zone *blkz, unsigned int idx, void *data) |
3b1a94c8 | 1184 | { |
d4100351 CH |
1185 | struct dmz_metadata *zmd = data; |
1186 | struct dm_zone *zone = &zmd->zones[idx]; | |
3b1a94c8 DLM |
1187 | struct dmz_dev *dev = zmd->dev; |
1188 | ||
1189 | /* Ignore the eventual last runt (smaller) zone */ | |
36820560 | 1190 | if (blkz->len != zmd->zone_nr_sectors) { |
3b1a94c8 DLM |
1191 | if (blkz->start + blkz->len == dev->capacity) |
1192 | return 0; | |
1193 | return -ENXIO; | |
1194 | } | |
1195 | ||
1196 | INIT_LIST_HEAD(&zone->link); | |
1197 | atomic_set(&zone->refcount, 0); | |
b7122873 | 1198 | zone->id = idx; |
3b1a94c8 DLM |
1199 | zone->chunk = DMZ_MAP_UNMAPPED; |
1200 | ||
d4100351 CH |
1201 | switch (blkz->type) { |
1202 | case BLK_ZONE_TYPE_CONVENTIONAL: | |
3b1a94c8 | 1203 | set_bit(DMZ_RND, &zone->flags); |
d4100351 CH |
1204 | break; |
1205 | case BLK_ZONE_TYPE_SEQWRITE_REQ: | |
1206 | case BLK_ZONE_TYPE_SEQWRITE_PREF: | |
3b1a94c8 | 1207 | set_bit(DMZ_SEQ, &zone->flags); |
d4100351 CH |
1208 | break; |
1209 | default: | |
3b1a94c8 | 1210 | return -ENXIO; |
d4100351 | 1211 | } |
3b1a94c8 DLM |
1212 | |
1213 | if (dmz_is_rnd(zone)) | |
1214 | zone->wp_block = 0; | |
1215 | else | |
1216 | zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); | |
1217 | ||
d4100351 CH |
1218 | if (blkz->cond == BLK_ZONE_COND_OFFLINE) |
1219 | set_bit(DMZ_OFFLINE, &zone->flags); | |
1220 | else if (blkz->cond == BLK_ZONE_COND_READONLY) | |
1221 | set_bit(DMZ_READ_ONLY, &zone->flags); | |
1222 | else { | |
3b1a94c8 DLM |
1223 | zmd->nr_useable_zones++; |
1224 | if (dmz_is_rnd(zone)) { | |
1225 | zmd->nr_rnd_zones++; | |
735bd7e4 | 1226 | if (!zmd->sb[0].zone) { |
3b1a94c8 | 1227 | /* Super block zone */ |
735bd7e4 | 1228 | zmd->sb[0].zone = zone; |
3b1a94c8 DLM |
1229 | } |
1230 | } | |
1231 | } | |
1232 | ||
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * Free zones descriptors. | |
1238 | */ | |
1239 | static void dmz_drop_zones(struct dmz_metadata *zmd) | |
1240 | { | |
1241 | kfree(zmd->zones); | |
1242 | zmd->zones = NULL; | |
1243 | } | |
1244 | ||
3b1a94c8 DLM |
1245 | /* |
1246 | * Allocate and initialize zone descriptors using the zone | |
1247 | * information from disk. | |
1248 | */ | |
1249 | static int dmz_init_zones(struct dmz_metadata *zmd) | |
1250 | { | |
1251 | struct dmz_dev *dev = zmd->dev; | |
d4100351 | 1252 | int ret; |
3b1a94c8 DLM |
1253 | |
1254 | /* Init */ | |
36820560 HR |
1255 | zmd->zone_nr_sectors = dev->zone_nr_sectors; |
1256 | zmd->zone_nr_sectors_shift = ilog2(zmd->zone_nr_sectors); | |
1257 | zmd->zone_nr_blocks = dmz_sect2blk(zmd->zone_nr_sectors); | |
1258 | zmd->zone_nr_blocks_shift = ilog2(zmd->zone_nr_blocks); | |
1259 | zmd->zone_bitmap_size = zmd->zone_nr_blocks >> 3; | |
b3996295 DF |
1260 | zmd->zone_nr_bitmap_blocks = |
1261 | max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT); | |
36820560 | 1262 | zmd->zone_bits_per_mblk = min_t(sector_t, zmd->zone_nr_blocks, |
b3996295 | 1263 | DMZ_BLOCK_SIZE_BITS); |
3b1a94c8 DLM |
1264 | |
1265 | /* Allocate zone array */ | |
36820560 HR |
1266 | zmd->nr_zones = dev->nr_zones; |
1267 | zmd->zones = kcalloc(zmd->nr_zones, sizeof(struct dm_zone), GFP_KERNEL); | |
3b1a94c8 DLM |
1268 | if (!zmd->zones) |
1269 | return -ENOMEM; | |
1270 | ||
1271 | dmz_dev_info(dev, "Using %zu B for zone information", | |
36820560 | 1272 | sizeof(struct dm_zone) * zmd->nr_zones); |
3b1a94c8 | 1273 | |
3b1a94c8 | 1274 | /* |
d4100351 CH |
1275 | * Get zone information and initialize zone descriptors. At the same |
1276 | * time, determine where the super block should be: first block of the | |
1277 | * first randomly writable zone. | |
3b1a94c8 | 1278 | */ |
d4100351 CH |
1279 | ret = blkdev_report_zones(dev->bdev, 0, BLK_ALL_ZONES, dmz_init_zone, |
1280 | zmd); | |
1281 | if (ret < 0) { | |
1282 | dmz_drop_zones(zmd); | |
1283 | return ret; | |
1284 | } | |
3b1a94c8 | 1285 | |
d4100351 CH |
1286 | return 0; |
1287 | } | |
7aedf75f | 1288 | |
d4100351 CH |
1289 | static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx, |
1290 | void *data) | |
1291 | { | |
1292 | struct dm_zone *zone = data; | |
3b1a94c8 | 1293 | |
d4100351 CH |
1294 | clear_bit(DMZ_OFFLINE, &zone->flags); |
1295 | clear_bit(DMZ_READ_ONLY, &zone->flags); | |
1296 | if (blkz->cond == BLK_ZONE_COND_OFFLINE) | |
1297 | set_bit(DMZ_OFFLINE, &zone->flags); | |
1298 | else if (blkz->cond == BLK_ZONE_COND_READONLY) | |
1299 | set_bit(DMZ_READ_ONLY, &zone->flags); | |
3b1a94c8 | 1300 | |
d4100351 CH |
1301 | if (dmz_is_seq(zone)) |
1302 | zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); | |
1303 | else | |
1304 | zone->wp_block = 0; | |
1305 | return 0; | |
3b1a94c8 DLM |
1306 | } |
1307 | ||
1308 | /* | |
1309 | * Update a zone information. | |
1310 | */ | |
1311 | static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1312 | { | |
aa821c8d | 1313 | struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); |
bd976e52 | 1314 | unsigned int noio_flag; |
3b1a94c8 DLM |
1315 | int ret; |
1316 | ||
bd976e52 DLM |
1317 | /* |
1318 | * Get zone information from disk. Since blkdev_report_zones() uses | |
1319 | * GFP_KERNEL by default for memory allocations, set the per-task | |
1320 | * PF_MEMALLOC_NOIO flag so that all allocations are done as if | |
1321 | * GFP_NOIO was specified. | |
1322 | */ | |
1323 | noio_flag = memalloc_noio_save(); | |
aa821c8d | 1324 | ret = blkdev_report_zones(dev->bdev, dmz_start_sect(zmd, zone), 1, |
d4100351 | 1325 | dmz_update_zone_cb, zone); |
bd976e52 | 1326 | memalloc_noio_restore(noio_flag); |
d4100351 CH |
1327 | |
1328 | if (ret == 0) | |
7aedf75f | 1329 | ret = -EIO; |
d4100351 | 1330 | if (ret < 0) { |
aa821c8d | 1331 | dmz_dev_err(dev, "Get zone %u report failed", |
b7122873 | 1332 | zone->id); |
aa821c8d | 1333 | dmz_check_bdev(dev); |
3b1a94c8 DLM |
1334 | return ret; |
1335 | } | |
1336 | ||
3b1a94c8 DLM |
1337 | return 0; |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | * Check a zone write pointer position when the zone is marked | |
1342 | * with the sequential write error flag. | |
1343 | */ | |
1344 | static int dmz_handle_seq_write_err(struct dmz_metadata *zmd, | |
1345 | struct dm_zone *zone) | |
1346 | { | |
aa821c8d | 1347 | struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); |
3b1a94c8 DLM |
1348 | unsigned int wp = 0; |
1349 | int ret; | |
1350 | ||
1351 | wp = zone->wp_block; | |
1352 | ret = dmz_update_zone(zmd, zone); | |
1353 | if (ret) | |
1354 | return ret; | |
1355 | ||
aa821c8d | 1356 | dmz_dev_warn(dev, "Processing zone %u write error (zone wp %u/%u)", |
b7122873 | 1357 | zone->id, zone->wp_block, wp); |
3b1a94c8 DLM |
1358 | |
1359 | if (zone->wp_block < wp) { | |
1360 | dmz_invalidate_blocks(zmd, zone, zone->wp_block, | |
1361 | wp - zone->wp_block); | |
1362 | } | |
1363 | ||
1364 | return 0; | |
1365 | } | |
1366 | ||
1367 | static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id) | |
1368 | { | |
1369 | return &zmd->zones[zone_id]; | |
1370 | } | |
1371 | ||
1372 | /* | |
1373 | * Reset a zone write pointer. | |
1374 | */ | |
1375 | static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1376 | { | |
1377 | int ret; | |
1378 | ||
1379 | /* | |
1380 | * Ignore offline zones, read only zones, | |
1381 | * and conventional zones. | |
1382 | */ | |
1383 | if (dmz_is_offline(zone) || | |
1384 | dmz_is_readonly(zone) || | |
1385 | dmz_is_rnd(zone)) | |
1386 | return 0; | |
1387 | ||
1388 | if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) { | |
aa821c8d | 1389 | struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); |
3b1a94c8 | 1390 | |
6c1b1da5 AJ |
1391 | ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET, |
1392 | dmz_start_sect(zmd, zone), | |
36820560 | 1393 | zmd->zone_nr_sectors, GFP_NOIO); |
3b1a94c8 DLM |
1394 | if (ret) { |
1395 | dmz_dev_err(dev, "Reset zone %u failed %d", | |
b7122873 | 1396 | zone->id, ret); |
3b1a94c8 DLM |
1397 | return ret; |
1398 | } | |
1399 | } | |
1400 | ||
1401 | /* Clear write error bit and rewind write pointer position */ | |
1402 | clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags); | |
1403 | zone->wp_block = 0; | |
1404 | ||
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone); | |
1409 | ||
1410 | /* | |
1411 | * Initialize chunk mapping. | |
1412 | */ | |
1413 | static int dmz_load_mapping(struct dmz_metadata *zmd) | |
1414 | { | |
1415 | struct dmz_dev *dev = zmd->dev; | |
1416 | struct dm_zone *dzone, *bzone; | |
1417 | struct dmz_mblock *dmap_mblk = NULL; | |
1418 | struct dmz_map *dmap; | |
1419 | unsigned int i = 0, e = 0, chunk = 0; | |
1420 | unsigned int dzone_id; | |
1421 | unsigned int bzone_id; | |
1422 | ||
1423 | /* Metadata block array for the chunk mapping table */ | |
1424 | zmd->map_mblk = kcalloc(zmd->nr_map_blocks, | |
1425 | sizeof(struct dmz_mblk *), GFP_KERNEL); | |
1426 | if (!zmd->map_mblk) | |
1427 | return -ENOMEM; | |
1428 | ||
1429 | /* Get chunk mapping table blocks and initialize zone mapping */ | |
1430 | while (chunk < zmd->nr_chunks) { | |
1431 | if (!dmap_mblk) { | |
1432 | /* Get mapping block */ | |
1433 | dmap_mblk = dmz_get_mblock(zmd, i + 1); | |
1434 | if (IS_ERR(dmap_mblk)) | |
1435 | return PTR_ERR(dmap_mblk); | |
1436 | zmd->map_mblk[i] = dmap_mblk; | |
1437 | dmap = (struct dmz_map *) dmap_mblk->data; | |
1438 | i++; | |
1439 | e = 0; | |
1440 | } | |
1441 | ||
1442 | /* Check data zone */ | |
1443 | dzone_id = le32_to_cpu(dmap[e].dzone_id); | |
1444 | if (dzone_id == DMZ_MAP_UNMAPPED) | |
1445 | goto next; | |
1446 | ||
36820560 | 1447 | if (dzone_id >= zmd->nr_zones) { |
3b1a94c8 DLM |
1448 | dmz_dev_err(dev, "Chunk %u mapping: invalid data zone ID %u", |
1449 | chunk, dzone_id); | |
1450 | return -EIO; | |
1451 | } | |
1452 | ||
1453 | dzone = dmz_get(zmd, dzone_id); | |
1454 | set_bit(DMZ_DATA, &dzone->flags); | |
1455 | dzone->chunk = chunk; | |
1456 | dmz_get_zone_weight(zmd, dzone); | |
1457 | ||
1458 | if (dmz_is_rnd(dzone)) | |
1459 | list_add_tail(&dzone->link, &zmd->map_rnd_list); | |
1460 | else | |
1461 | list_add_tail(&dzone->link, &zmd->map_seq_list); | |
1462 | ||
1463 | /* Check buffer zone */ | |
1464 | bzone_id = le32_to_cpu(dmap[e].bzone_id); | |
1465 | if (bzone_id == DMZ_MAP_UNMAPPED) | |
1466 | goto next; | |
1467 | ||
36820560 | 1468 | if (bzone_id >= zmd->nr_zones) { |
3b1a94c8 DLM |
1469 | dmz_dev_err(dev, "Chunk %u mapping: invalid buffer zone ID %u", |
1470 | chunk, bzone_id); | |
1471 | return -EIO; | |
1472 | } | |
1473 | ||
1474 | bzone = dmz_get(zmd, bzone_id); | |
1475 | if (!dmz_is_rnd(bzone)) { | |
1476 | dmz_dev_err(dev, "Chunk %u mapping: invalid buffer zone %u", | |
1477 | chunk, bzone_id); | |
1478 | return -EIO; | |
1479 | } | |
1480 | ||
1481 | set_bit(DMZ_DATA, &bzone->flags); | |
1482 | set_bit(DMZ_BUF, &bzone->flags); | |
1483 | bzone->chunk = chunk; | |
1484 | bzone->bzone = dzone; | |
1485 | dzone->bzone = bzone; | |
1486 | dmz_get_zone_weight(zmd, bzone); | |
1487 | list_add_tail(&bzone->link, &zmd->map_rnd_list); | |
1488 | next: | |
1489 | chunk++; | |
1490 | e++; | |
1491 | if (e >= DMZ_MAP_ENTRIES) | |
1492 | dmap_mblk = NULL; | |
1493 | } | |
1494 | ||
1495 | /* | |
1496 | * At this point, only meta zones and mapped data zones were | |
1497 | * fully initialized. All remaining zones are unmapped data | |
1498 | * zones. Finish initializing those here. | |
1499 | */ | |
36820560 | 1500 | for (i = 0; i < zmd->nr_zones; i++) { |
3b1a94c8 DLM |
1501 | dzone = dmz_get(zmd, i); |
1502 | if (dmz_is_meta(dzone)) | |
1503 | continue; | |
1504 | ||
1505 | if (dmz_is_rnd(dzone)) | |
1506 | zmd->nr_rnd++; | |
1507 | else | |
1508 | zmd->nr_seq++; | |
1509 | ||
1510 | if (dmz_is_data(dzone)) { | |
1511 | /* Already initialized */ | |
1512 | continue; | |
1513 | } | |
1514 | ||
1515 | /* Unmapped data zone */ | |
1516 | set_bit(DMZ_DATA, &dzone->flags); | |
1517 | dzone->chunk = DMZ_MAP_UNMAPPED; | |
1518 | if (dmz_is_rnd(dzone)) { | |
1519 | list_add_tail(&dzone->link, &zmd->unmap_rnd_list); | |
1520 | atomic_inc(&zmd->unmap_nr_rnd); | |
1521 | } else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) { | |
1522 | list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list); | |
1523 | atomic_inc(&zmd->nr_reserved_seq_zones); | |
1524 | zmd->nr_seq--; | |
1525 | } else { | |
1526 | list_add_tail(&dzone->link, &zmd->unmap_seq_list); | |
1527 | atomic_inc(&zmd->unmap_nr_seq); | |
1528 | } | |
1529 | } | |
1530 | ||
1531 | return 0; | |
1532 | } | |
1533 | ||
1534 | /* | |
1535 | * Set a data chunk mapping. | |
1536 | */ | |
1537 | static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, | |
1538 | unsigned int dzone_id, unsigned int bzone_id) | |
1539 | { | |
1540 | struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; | |
1541 | struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; | |
1542 | int map_idx = chunk & DMZ_MAP_ENTRIES_MASK; | |
1543 | ||
1544 | dmap[map_idx].dzone_id = cpu_to_le32(dzone_id); | |
1545 | dmap[map_idx].bzone_id = cpu_to_le32(bzone_id); | |
1546 | dmz_dirty_mblock(zmd, dmap_mblk); | |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * The list of mapped zones is maintained in LRU order. | |
1551 | * This rotates a zone at the end of its map list. | |
1552 | */ | |
1553 | static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1554 | { | |
1555 | if (list_empty(&zone->link)) | |
1556 | return; | |
1557 | ||
1558 | list_del_init(&zone->link); | |
1559 | if (dmz_is_seq(zone)) { | |
1560 | /* LRU rotate sequential zone */ | |
1561 | list_add_tail(&zone->link, &zmd->map_seq_list); | |
1562 | } else { | |
1563 | /* LRU rotate random zone */ | |
1564 | list_add_tail(&zone->link, &zmd->map_rnd_list); | |
1565 | } | |
1566 | } | |
1567 | ||
1568 | /* | |
1569 | * The list of mapped random zones is maintained | |
1570 | * in LRU order. This rotates a zone at the end of the list. | |
1571 | */ | |
1572 | static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1573 | { | |
1574 | __dmz_lru_zone(zmd, zone); | |
1575 | if (zone->bzone) | |
1576 | __dmz_lru_zone(zmd, zone->bzone); | |
1577 | } | |
1578 | ||
1579 | /* | |
1580 | * Wait for any zone to be freed. | |
1581 | */ | |
1582 | static void dmz_wait_for_free_zones(struct dmz_metadata *zmd) | |
1583 | { | |
1584 | DEFINE_WAIT(wait); | |
1585 | ||
1586 | prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE); | |
1587 | dmz_unlock_map(zmd); | |
1588 | dmz_unlock_metadata(zmd); | |
1589 | ||
1590 | io_schedule_timeout(HZ); | |
1591 | ||
1592 | dmz_lock_metadata(zmd); | |
1593 | dmz_lock_map(zmd); | |
1594 | finish_wait(&zmd->free_wq, &wait); | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * Lock a zone for reclaim (set the zone RECLAIM bit). | |
1599 | * Returns false if the zone cannot be locked or if it is already locked | |
1600 | * and 1 otherwise. | |
1601 | */ | |
1602 | int dmz_lock_zone_reclaim(struct dm_zone *zone) | |
1603 | { | |
1604 | /* Active zones cannot be reclaimed */ | |
1605 | if (dmz_is_active(zone)) | |
1606 | return 0; | |
1607 | ||
1608 | return !test_and_set_bit(DMZ_RECLAIM, &zone->flags); | |
1609 | } | |
1610 | ||
1611 | /* | |
1612 | * Clear a zone reclaim flag. | |
1613 | */ | |
1614 | void dmz_unlock_zone_reclaim(struct dm_zone *zone) | |
1615 | { | |
1616 | WARN_ON(dmz_is_active(zone)); | |
1617 | WARN_ON(!dmz_in_reclaim(zone)); | |
1618 | ||
1619 | clear_bit_unlock(DMZ_RECLAIM, &zone->flags); | |
1620 | smp_mb__after_atomic(); | |
1621 | wake_up_bit(&zone->flags, DMZ_RECLAIM); | |
1622 | } | |
1623 | ||
1624 | /* | |
1625 | * Wait for a zone reclaim to complete. | |
1626 | */ | |
1627 | static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1628 | { | |
1629 | dmz_unlock_map(zmd); | |
1630 | dmz_unlock_metadata(zmd); | |
1631 | wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ); | |
1632 | dmz_lock_metadata(zmd); | |
1633 | dmz_lock_map(zmd); | |
1634 | } | |
1635 | ||
1636 | /* | |
1637 | * Select a random write zone for reclaim. | |
1638 | */ | |
1639 | static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd) | |
1640 | { | |
1641 | struct dm_zone *dzone = NULL; | |
1642 | struct dm_zone *zone; | |
1643 | ||
1644 | if (list_empty(&zmd->map_rnd_list)) | |
b234c6d7 | 1645 | return ERR_PTR(-EBUSY); |
3b1a94c8 DLM |
1646 | |
1647 | list_for_each_entry(zone, &zmd->map_rnd_list, link) { | |
1648 | if (dmz_is_buf(zone)) | |
1649 | dzone = zone->bzone; | |
1650 | else | |
1651 | dzone = zone; | |
1652 | if (dmz_lock_zone_reclaim(dzone)) | |
1653 | return dzone; | |
1654 | } | |
1655 | ||
b234c6d7 | 1656 | return ERR_PTR(-EBUSY); |
3b1a94c8 DLM |
1657 | } |
1658 | ||
1659 | /* | |
1660 | * Select a buffered sequential zone for reclaim. | |
1661 | */ | |
1662 | static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd) | |
1663 | { | |
1664 | struct dm_zone *zone; | |
1665 | ||
1666 | if (list_empty(&zmd->map_seq_list)) | |
e0702d90 | 1667 | return ERR_PTR(-EBUSY); |
3b1a94c8 DLM |
1668 | |
1669 | list_for_each_entry(zone, &zmd->map_seq_list, link) { | |
1670 | if (!zone->bzone) | |
1671 | continue; | |
1672 | if (dmz_lock_zone_reclaim(zone)) | |
1673 | return zone; | |
1674 | } | |
1675 | ||
e0702d90 | 1676 | return ERR_PTR(-EBUSY); |
3b1a94c8 DLM |
1677 | } |
1678 | ||
1679 | /* | |
1680 | * Select a zone for reclaim. | |
1681 | */ | |
1682 | struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd) | |
1683 | { | |
1684 | struct dm_zone *zone; | |
1685 | ||
1686 | /* | |
1687 | * Search for a zone candidate to reclaim: 2 cases are possible. | |
1688 | * (1) There is no free sequential zones. Then a random data zone | |
1689 | * cannot be reclaimed. So choose a sequential zone to reclaim so | |
1690 | * that afterward a random zone can be reclaimed. | |
1691 | * (2) At least one free sequential zone is available, then choose | |
1692 | * the oldest random zone (data or buffer) that can be locked. | |
1693 | */ | |
1694 | dmz_lock_map(zmd); | |
1695 | if (list_empty(&zmd->reserved_seq_zones_list)) | |
1696 | zone = dmz_get_seq_zone_for_reclaim(zmd); | |
1697 | else | |
1698 | zone = dmz_get_rnd_zone_for_reclaim(zmd); | |
1699 | dmz_unlock_map(zmd); | |
1700 | ||
1701 | return zone; | |
1702 | } | |
1703 | ||
3b1a94c8 DLM |
1704 | /* |
1705 | * Get the zone mapping a chunk, if the chunk is mapped already. | |
1706 | * If no mapping exist and the operation is WRITE, a zone is | |
1707 | * allocated and used to map the chunk. | |
1708 | * The zone returned will be set to the active state. | |
1709 | */ | |
1710 | struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op) | |
1711 | { | |
1712 | struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; | |
1713 | struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; | |
1714 | int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK; | |
1715 | unsigned int dzone_id; | |
1716 | struct dm_zone *dzone = NULL; | |
1717 | int ret = 0; | |
1718 | ||
1719 | dmz_lock_map(zmd); | |
1720 | again: | |
1721 | /* Get the chunk mapping */ | |
1722 | dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id); | |
1723 | if (dzone_id == DMZ_MAP_UNMAPPED) { | |
1724 | /* | |
1725 | * Read or discard in unmapped chunks are fine. But for | |
1726 | * writes, we need a mapping, so get one. | |
1727 | */ | |
1728 | if (op != REQ_OP_WRITE) | |
1729 | goto out; | |
1730 | ||
ad1bd578 | 1731 | /* Allocate a random zone */ |
3b1a94c8 DLM |
1732 | dzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND); |
1733 | if (!dzone) { | |
d0e21ce4 | 1734 | if (dmz_dev_is_dying(zmd)) { |
75d66ffb DF |
1735 | dzone = ERR_PTR(-EIO); |
1736 | goto out; | |
1737 | } | |
3b1a94c8 DLM |
1738 | dmz_wait_for_free_zones(zmd); |
1739 | goto again; | |
1740 | } | |
1741 | ||
1742 | dmz_map_zone(zmd, dzone, chunk); | |
1743 | ||
1744 | } else { | |
1745 | /* The chunk is already mapped: get the mapping zone */ | |
1746 | dzone = dmz_get(zmd, dzone_id); | |
1747 | if (dzone->chunk != chunk) { | |
1748 | dzone = ERR_PTR(-EIO); | |
1749 | goto out; | |
1750 | } | |
1751 | ||
1752 | /* Repair write pointer if the sequential dzone has error */ | |
1753 | if (dmz_seq_write_err(dzone)) { | |
1754 | ret = dmz_handle_seq_write_err(zmd, dzone); | |
1755 | if (ret) { | |
1756 | dzone = ERR_PTR(-EIO); | |
1757 | goto out; | |
1758 | } | |
1759 | clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags); | |
1760 | } | |
1761 | } | |
1762 | ||
1763 | /* | |
1764 | * If the zone is being reclaimed, the chunk mapping may change | |
1765 | * to a different zone. So wait for reclaim and retry. Otherwise, | |
1766 | * activate the zone (this will prevent reclaim from touching it). | |
1767 | */ | |
1768 | if (dmz_in_reclaim(dzone)) { | |
1769 | dmz_wait_for_reclaim(zmd, dzone); | |
1770 | goto again; | |
1771 | } | |
1772 | dmz_activate_zone(dzone); | |
1773 | dmz_lru_zone(zmd, dzone); | |
1774 | out: | |
1775 | dmz_unlock_map(zmd); | |
1776 | ||
1777 | return dzone; | |
1778 | } | |
1779 | ||
1780 | /* | |
1781 | * Write and discard change the block validity of data zones and their buffer | |
1782 | * zones. Check here that valid blocks are still present. If all blocks are | |
1783 | * invalid, the zones can be unmapped on the fly without waiting for reclaim | |
1784 | * to do it. | |
1785 | */ | |
1786 | void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone) | |
1787 | { | |
1788 | struct dm_zone *bzone; | |
1789 | ||
1790 | dmz_lock_map(zmd); | |
1791 | ||
1792 | bzone = dzone->bzone; | |
1793 | if (bzone) { | |
1794 | if (dmz_weight(bzone)) | |
1795 | dmz_lru_zone(zmd, bzone); | |
1796 | else { | |
1797 | /* Empty buffer zone: reclaim it */ | |
1798 | dmz_unmap_zone(zmd, bzone); | |
1799 | dmz_free_zone(zmd, bzone); | |
1800 | bzone = NULL; | |
1801 | } | |
1802 | } | |
1803 | ||
1804 | /* Deactivate the data zone */ | |
1805 | dmz_deactivate_zone(dzone); | |
1806 | if (dmz_is_active(dzone) || bzone || dmz_weight(dzone)) | |
1807 | dmz_lru_zone(zmd, dzone); | |
1808 | else { | |
1809 | /* Unbuffered inactive empty data zone: reclaim it */ | |
1810 | dmz_unmap_zone(zmd, dzone); | |
1811 | dmz_free_zone(zmd, dzone); | |
1812 | } | |
1813 | ||
1814 | dmz_unlock_map(zmd); | |
1815 | } | |
1816 | ||
1817 | /* | |
1818 | * Allocate and map a random zone to buffer a chunk | |
1819 | * already mapped to a sequential zone. | |
1820 | */ | |
1821 | struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd, | |
1822 | struct dm_zone *dzone) | |
1823 | { | |
1824 | struct dm_zone *bzone; | |
1825 | ||
1826 | dmz_lock_map(zmd); | |
1827 | again: | |
1828 | bzone = dzone->bzone; | |
1829 | if (bzone) | |
1830 | goto out; | |
1831 | ||
ad1bd578 | 1832 | /* Allocate a random zone */ |
3b1a94c8 DLM |
1833 | bzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND); |
1834 | if (!bzone) { | |
d0e21ce4 | 1835 | if (dmz_dev_is_dying(zmd)) { |
75d66ffb DF |
1836 | bzone = ERR_PTR(-EIO); |
1837 | goto out; | |
1838 | } | |
3b1a94c8 DLM |
1839 | dmz_wait_for_free_zones(zmd); |
1840 | goto again; | |
1841 | } | |
1842 | ||
1843 | /* Update the chunk mapping */ | |
b7122873 | 1844 | dmz_set_chunk_mapping(zmd, dzone->chunk, dzone->id, bzone->id); |
3b1a94c8 DLM |
1845 | |
1846 | set_bit(DMZ_BUF, &bzone->flags); | |
1847 | bzone->chunk = dzone->chunk; | |
1848 | bzone->bzone = dzone; | |
1849 | dzone->bzone = bzone; | |
1850 | list_add_tail(&bzone->link, &zmd->map_rnd_list); | |
1851 | out: | |
1852 | dmz_unlock_map(zmd); | |
1853 | ||
1854 | return bzone; | |
1855 | } | |
1856 | ||
1857 | /* | |
1858 | * Get an unmapped (free) zone. | |
1859 | * This must be called with the mapping lock held. | |
1860 | */ | |
1861 | struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags) | |
1862 | { | |
1863 | struct list_head *list; | |
1864 | struct dm_zone *zone; | |
1865 | ||
1866 | if (flags & DMZ_ALLOC_RND) | |
1867 | list = &zmd->unmap_rnd_list; | |
1868 | else | |
1869 | list = &zmd->unmap_seq_list; | |
1870 | again: | |
1871 | if (list_empty(list)) { | |
1872 | /* | |
1873 | * No free zone: if this is for reclaim, allow using the | |
1874 | * reserved sequential zones. | |
1875 | */ | |
1876 | if (!(flags & DMZ_ALLOC_RECLAIM) || | |
1877 | list_empty(&zmd->reserved_seq_zones_list)) | |
1878 | return NULL; | |
1879 | ||
1880 | zone = list_first_entry(&zmd->reserved_seq_zones_list, | |
1881 | struct dm_zone, link); | |
1882 | list_del_init(&zone->link); | |
1883 | atomic_dec(&zmd->nr_reserved_seq_zones); | |
1884 | return zone; | |
1885 | } | |
1886 | ||
1887 | zone = list_first_entry(list, struct dm_zone, link); | |
1888 | list_del_init(&zone->link); | |
1889 | ||
1890 | if (dmz_is_rnd(zone)) | |
1891 | atomic_dec(&zmd->unmap_nr_rnd); | |
1892 | else | |
1893 | atomic_dec(&zmd->unmap_nr_seq); | |
1894 | ||
1895 | if (dmz_is_offline(zone)) { | |
b7122873 | 1896 | dmz_dev_warn(zmd->dev, "Zone %u is offline", zone->id); |
3b1a94c8 DLM |
1897 | zone = NULL; |
1898 | goto again; | |
1899 | } | |
1900 | ||
1901 | return zone; | |
1902 | } | |
1903 | ||
1904 | /* | |
1905 | * Free a zone. | |
1906 | * This must be called with the mapping lock held. | |
1907 | */ | |
1908 | void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1909 | { | |
1910 | /* If this is a sequential zone, reset it */ | |
1911 | if (dmz_is_seq(zone)) | |
1912 | dmz_reset_zone(zmd, zone); | |
1913 | ||
1914 | /* Return the zone to its type unmap list */ | |
1915 | if (dmz_is_rnd(zone)) { | |
1916 | list_add_tail(&zone->link, &zmd->unmap_rnd_list); | |
1917 | atomic_inc(&zmd->unmap_nr_rnd); | |
1918 | } else if (atomic_read(&zmd->nr_reserved_seq_zones) < | |
1919 | zmd->nr_reserved_seq) { | |
1920 | list_add_tail(&zone->link, &zmd->reserved_seq_zones_list); | |
1921 | atomic_inc(&zmd->nr_reserved_seq_zones); | |
1922 | } else { | |
1923 | list_add_tail(&zone->link, &zmd->unmap_seq_list); | |
1924 | atomic_inc(&zmd->unmap_nr_seq); | |
1925 | } | |
1926 | ||
1927 | wake_up_all(&zmd->free_wq); | |
1928 | } | |
1929 | ||
1930 | /* | |
1931 | * Map a chunk to a zone. | |
1932 | * This must be called with the mapping lock held. | |
1933 | */ | |
1934 | void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone, | |
1935 | unsigned int chunk) | |
1936 | { | |
1937 | /* Set the chunk mapping */ | |
b7122873 | 1938 | dmz_set_chunk_mapping(zmd, chunk, dzone->id, |
3b1a94c8 DLM |
1939 | DMZ_MAP_UNMAPPED); |
1940 | dzone->chunk = chunk; | |
1941 | if (dmz_is_rnd(dzone)) | |
1942 | list_add_tail(&dzone->link, &zmd->map_rnd_list); | |
1943 | else | |
1944 | list_add_tail(&dzone->link, &zmd->map_seq_list); | |
1945 | } | |
1946 | ||
1947 | /* | |
1948 | * Unmap a zone. | |
1949 | * This must be called with the mapping lock held. | |
1950 | */ | |
1951 | void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1952 | { | |
1953 | unsigned int chunk = zone->chunk; | |
1954 | unsigned int dzone_id; | |
1955 | ||
1956 | if (chunk == DMZ_MAP_UNMAPPED) { | |
1957 | /* Already unmapped */ | |
1958 | return; | |
1959 | } | |
1960 | ||
1961 | if (test_and_clear_bit(DMZ_BUF, &zone->flags)) { | |
1962 | /* | |
1963 | * Unmapping the chunk buffer zone: clear only | |
1964 | * the chunk buffer mapping | |
1965 | */ | |
b7122873 | 1966 | dzone_id = zone->bzone->id; |
3b1a94c8 DLM |
1967 | zone->bzone->bzone = NULL; |
1968 | zone->bzone = NULL; | |
1969 | ||
1970 | } else { | |
1971 | /* | |
1972 | * Unmapping the chunk data zone: the zone must | |
1973 | * not be buffered. | |
1974 | */ | |
1975 | if (WARN_ON(zone->bzone)) { | |
1976 | zone->bzone->bzone = NULL; | |
1977 | zone->bzone = NULL; | |
1978 | } | |
1979 | dzone_id = DMZ_MAP_UNMAPPED; | |
1980 | } | |
1981 | ||
1982 | dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED); | |
1983 | ||
1984 | zone->chunk = DMZ_MAP_UNMAPPED; | |
1985 | list_del_init(&zone->link); | |
1986 | } | |
1987 | ||
1988 | /* | |
1989 | * Set @nr_bits bits in @bitmap starting from @bit. | |
1990 | * Return the number of bits changed from 0 to 1. | |
1991 | */ | |
1992 | static unsigned int dmz_set_bits(unsigned long *bitmap, | |
1993 | unsigned int bit, unsigned int nr_bits) | |
1994 | { | |
1995 | unsigned long *addr; | |
1996 | unsigned int end = bit + nr_bits; | |
1997 | unsigned int n = 0; | |
1998 | ||
1999 | while (bit < end) { | |
2000 | if (((bit & (BITS_PER_LONG - 1)) == 0) && | |
2001 | ((end - bit) >= BITS_PER_LONG)) { | |
2002 | /* Try to set the whole word at once */ | |
2003 | addr = bitmap + BIT_WORD(bit); | |
2004 | if (*addr == 0) { | |
2005 | *addr = ULONG_MAX; | |
2006 | n += BITS_PER_LONG; | |
2007 | bit += BITS_PER_LONG; | |
2008 | continue; | |
2009 | } | |
2010 | } | |
2011 | ||
2012 | if (!test_and_set_bit(bit, bitmap)) | |
2013 | n++; | |
2014 | bit++; | |
2015 | } | |
2016 | ||
2017 | return n; | |
2018 | } | |
2019 | ||
2020 | /* | |
2021 | * Get the bitmap block storing the bit for chunk_block in zone. | |
2022 | */ | |
2023 | static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd, | |
2024 | struct dm_zone *zone, | |
2025 | sector_t chunk_block) | |
2026 | { | |
2027 | sector_t bitmap_block = 1 + zmd->nr_map_blocks + | |
b7122873 | 2028 | (sector_t)(zone->id * zmd->zone_nr_bitmap_blocks) + |
3b1a94c8 DLM |
2029 | (chunk_block >> DMZ_BLOCK_SHIFT_BITS); |
2030 | ||
2031 | return dmz_get_mblock(zmd, bitmap_block); | |
2032 | } | |
2033 | ||
2034 | /* | |
2035 | * Copy the valid blocks bitmap of from_zone to the bitmap of to_zone. | |
2036 | */ | |
2037 | int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, | |
2038 | struct dm_zone *to_zone) | |
2039 | { | |
2040 | struct dmz_mblock *from_mblk, *to_mblk; | |
2041 | sector_t chunk_block = 0; | |
2042 | ||
2043 | /* Get the zones bitmap blocks */ | |
36820560 | 2044 | while (chunk_block < zmd->zone_nr_blocks) { |
3b1a94c8 DLM |
2045 | from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block); |
2046 | if (IS_ERR(from_mblk)) | |
2047 | return PTR_ERR(from_mblk); | |
2048 | to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block); | |
2049 | if (IS_ERR(to_mblk)) { | |
2050 | dmz_release_mblock(zmd, from_mblk); | |
2051 | return PTR_ERR(to_mblk); | |
2052 | } | |
2053 | ||
2054 | memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE); | |
2055 | dmz_dirty_mblock(zmd, to_mblk); | |
2056 | ||
2057 | dmz_release_mblock(zmd, to_mblk); | |
2058 | dmz_release_mblock(zmd, from_mblk); | |
2059 | ||
b3996295 | 2060 | chunk_block += zmd->zone_bits_per_mblk; |
3b1a94c8 DLM |
2061 | } |
2062 | ||
2063 | to_zone->weight = from_zone->weight; | |
2064 | ||
2065 | return 0; | |
2066 | } | |
2067 | ||
2068 | /* | |
2069 | * Merge the valid blocks bitmap of from_zone into the bitmap of to_zone, | |
2070 | * starting from chunk_block. | |
2071 | */ | |
2072 | int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, | |
2073 | struct dm_zone *to_zone, sector_t chunk_block) | |
2074 | { | |
2075 | unsigned int nr_blocks; | |
2076 | int ret; | |
2077 | ||
2078 | /* Get the zones bitmap blocks */ | |
36820560 | 2079 | while (chunk_block < zmd->zone_nr_blocks) { |
3b1a94c8 DLM |
2080 | /* Get a valid region from the source zone */ |
2081 | ret = dmz_first_valid_block(zmd, from_zone, &chunk_block); | |
2082 | if (ret <= 0) | |
2083 | return ret; | |
2084 | ||
2085 | nr_blocks = ret; | |
2086 | ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks); | |
2087 | if (ret) | |
2088 | return ret; | |
2089 | ||
2090 | chunk_block += nr_blocks; | |
2091 | } | |
2092 | ||
2093 | return 0; | |
2094 | } | |
2095 | ||
2096 | /* | |
2097 | * Validate all the blocks in the range [block..block+nr_blocks-1]. | |
2098 | */ | |
2099 | int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2100 | sector_t chunk_block, unsigned int nr_blocks) | |
2101 | { | |
2102 | unsigned int count, bit, nr_bits; | |
36820560 | 2103 | unsigned int zone_nr_blocks = zmd->zone_nr_blocks; |
3b1a94c8 DLM |
2104 | struct dmz_mblock *mblk; |
2105 | unsigned int n = 0; | |
2106 | ||
2107 | dmz_dev_debug(zmd->dev, "=> VALIDATE zone %u, block %llu, %u blocks", | |
b7122873 | 2108 | zone->id, (unsigned long long)chunk_block, |
3b1a94c8 DLM |
2109 | nr_blocks); |
2110 | ||
2111 | WARN_ON(chunk_block + nr_blocks > zone_nr_blocks); | |
2112 | ||
2113 | while (nr_blocks) { | |
2114 | /* Get bitmap block */ | |
2115 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2116 | if (IS_ERR(mblk)) | |
2117 | return PTR_ERR(mblk); | |
2118 | ||
2119 | /* Set bits */ | |
2120 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
b3996295 | 2121 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
3b1a94c8 DLM |
2122 | |
2123 | count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits); | |
2124 | if (count) { | |
2125 | dmz_dirty_mblock(zmd, mblk); | |
2126 | n += count; | |
2127 | } | |
2128 | dmz_release_mblock(zmd, mblk); | |
2129 | ||
2130 | nr_blocks -= nr_bits; | |
2131 | chunk_block += nr_bits; | |
2132 | } | |
2133 | ||
2134 | if (likely(zone->weight + n <= zone_nr_blocks)) | |
2135 | zone->weight += n; | |
2136 | else { | |
2137 | dmz_dev_warn(zmd->dev, "Zone %u: weight %u should be <= %u", | |
b7122873 | 2138 | zone->id, zone->weight, |
3b1a94c8 DLM |
2139 | zone_nr_blocks - n); |
2140 | zone->weight = zone_nr_blocks; | |
2141 | } | |
2142 | ||
2143 | return 0; | |
2144 | } | |
2145 | ||
2146 | /* | |
2147 | * Clear nr_bits bits in bitmap starting from bit. | |
2148 | * Return the number of bits cleared. | |
2149 | */ | |
2150 | static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits) | |
2151 | { | |
2152 | unsigned long *addr; | |
2153 | int end = bit + nr_bits; | |
2154 | int n = 0; | |
2155 | ||
2156 | while (bit < end) { | |
2157 | if (((bit & (BITS_PER_LONG - 1)) == 0) && | |
2158 | ((end - bit) >= BITS_PER_LONG)) { | |
2159 | /* Try to clear whole word at once */ | |
2160 | addr = bitmap + BIT_WORD(bit); | |
2161 | if (*addr == ULONG_MAX) { | |
2162 | *addr = 0; | |
2163 | n += BITS_PER_LONG; | |
2164 | bit += BITS_PER_LONG; | |
2165 | continue; | |
2166 | } | |
2167 | } | |
2168 | ||
2169 | if (test_and_clear_bit(bit, bitmap)) | |
2170 | n++; | |
2171 | bit++; | |
2172 | } | |
2173 | ||
2174 | return n; | |
2175 | } | |
2176 | ||
2177 | /* | |
2178 | * Invalidate all the blocks in the range [block..block+nr_blocks-1]. | |
2179 | */ | |
2180 | int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2181 | sector_t chunk_block, unsigned int nr_blocks) | |
2182 | { | |
2183 | unsigned int count, bit, nr_bits; | |
2184 | struct dmz_mblock *mblk; | |
2185 | unsigned int n = 0; | |
2186 | ||
2187 | dmz_dev_debug(zmd->dev, "=> INVALIDATE zone %u, block %llu, %u blocks", | |
b7122873 | 2188 | zone->id, (u64)chunk_block, nr_blocks); |
3b1a94c8 | 2189 | |
36820560 | 2190 | WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks); |
3b1a94c8 DLM |
2191 | |
2192 | while (nr_blocks) { | |
2193 | /* Get bitmap block */ | |
2194 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2195 | if (IS_ERR(mblk)) | |
2196 | return PTR_ERR(mblk); | |
2197 | ||
2198 | /* Clear bits */ | |
2199 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
b3996295 | 2200 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
3b1a94c8 DLM |
2201 | |
2202 | count = dmz_clear_bits((unsigned long *)mblk->data, | |
2203 | bit, nr_bits); | |
2204 | if (count) { | |
2205 | dmz_dirty_mblock(zmd, mblk); | |
2206 | n += count; | |
2207 | } | |
2208 | dmz_release_mblock(zmd, mblk); | |
2209 | ||
2210 | nr_blocks -= nr_bits; | |
2211 | chunk_block += nr_bits; | |
2212 | } | |
2213 | ||
2214 | if (zone->weight >= n) | |
2215 | zone->weight -= n; | |
2216 | else { | |
2217 | dmz_dev_warn(zmd->dev, "Zone %u: weight %u should be >= %u", | |
b7122873 | 2218 | zone->id, zone->weight, n); |
3b1a94c8 DLM |
2219 | zone->weight = 0; |
2220 | } | |
2221 | ||
2222 | return 0; | |
2223 | } | |
2224 | ||
2225 | /* | |
2226 | * Get a block bit value. | |
2227 | */ | |
2228 | static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2229 | sector_t chunk_block) | |
2230 | { | |
2231 | struct dmz_mblock *mblk; | |
2232 | int ret; | |
2233 | ||
36820560 | 2234 | WARN_ON(chunk_block >= zmd->zone_nr_blocks); |
3b1a94c8 DLM |
2235 | |
2236 | /* Get bitmap block */ | |
2237 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2238 | if (IS_ERR(mblk)) | |
2239 | return PTR_ERR(mblk); | |
2240 | ||
2241 | /* Get offset */ | |
2242 | ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS, | |
2243 | (unsigned long *) mblk->data) != 0; | |
2244 | ||
2245 | dmz_release_mblock(zmd, mblk); | |
2246 | ||
2247 | return ret; | |
2248 | } | |
2249 | ||
2250 | /* | |
2251 | * Return the number of blocks from chunk_block to the first block with a bit | |
2252 | * value specified by set. Search at most nr_blocks blocks from chunk_block. | |
2253 | */ | |
2254 | static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2255 | sector_t chunk_block, unsigned int nr_blocks, | |
2256 | int set) | |
2257 | { | |
2258 | struct dmz_mblock *mblk; | |
2259 | unsigned int bit, set_bit, nr_bits; | |
b3996295 | 2260 | unsigned int zone_bits = zmd->zone_bits_per_mblk; |
3b1a94c8 DLM |
2261 | unsigned long *bitmap; |
2262 | int n = 0; | |
2263 | ||
36820560 | 2264 | WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks); |
3b1a94c8 DLM |
2265 | |
2266 | while (nr_blocks) { | |
2267 | /* Get bitmap block */ | |
2268 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2269 | if (IS_ERR(mblk)) | |
2270 | return PTR_ERR(mblk); | |
2271 | ||
2272 | /* Get offset */ | |
2273 | bitmap = (unsigned long *) mblk->data; | |
2274 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
b3996295 | 2275 | nr_bits = min(nr_blocks, zone_bits - bit); |
3b1a94c8 | 2276 | if (set) |
b3996295 | 2277 | set_bit = find_next_bit(bitmap, zone_bits, bit); |
3b1a94c8 | 2278 | else |
b3996295 | 2279 | set_bit = find_next_zero_bit(bitmap, zone_bits, bit); |
3b1a94c8 DLM |
2280 | dmz_release_mblock(zmd, mblk); |
2281 | ||
2282 | n += set_bit - bit; | |
b3996295 | 2283 | if (set_bit < zone_bits) |
3b1a94c8 DLM |
2284 | break; |
2285 | ||
2286 | nr_blocks -= nr_bits; | |
2287 | chunk_block += nr_bits; | |
2288 | } | |
2289 | ||
2290 | return n; | |
2291 | } | |
2292 | ||
2293 | /* | |
2294 | * Test if chunk_block is valid. If it is, the number of consecutive | |
2295 | * valid blocks from chunk_block will be returned. | |
2296 | */ | |
2297 | int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2298 | sector_t chunk_block) | |
2299 | { | |
2300 | int valid; | |
2301 | ||
2302 | valid = dmz_test_block(zmd, zone, chunk_block); | |
2303 | if (valid <= 0) | |
2304 | return valid; | |
2305 | ||
2306 | /* The block is valid: get the number of valid blocks from block */ | |
2307 | return dmz_to_next_set_block(zmd, zone, chunk_block, | |
36820560 | 2308 | zmd->zone_nr_blocks - chunk_block, 0); |
3b1a94c8 DLM |
2309 | } |
2310 | ||
2311 | /* | |
2312 | * Find the first valid block from @chunk_block in @zone. | |
2313 | * If such a block is found, its number is returned using | |
2314 | * @chunk_block and the total number of valid blocks from @chunk_block | |
2315 | * is returned. | |
2316 | */ | |
2317 | int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2318 | sector_t *chunk_block) | |
2319 | { | |
2320 | sector_t start_block = *chunk_block; | |
2321 | int ret; | |
2322 | ||
2323 | ret = dmz_to_next_set_block(zmd, zone, start_block, | |
36820560 | 2324 | zmd->zone_nr_blocks - start_block, 1); |
3b1a94c8 DLM |
2325 | if (ret < 0) |
2326 | return ret; | |
2327 | ||
2328 | start_block += ret; | |
2329 | *chunk_block = start_block; | |
2330 | ||
2331 | return dmz_to_next_set_block(zmd, zone, start_block, | |
36820560 | 2332 | zmd->zone_nr_blocks - start_block, 0); |
3b1a94c8 DLM |
2333 | } |
2334 | ||
2335 | /* | |
2336 | * Count the number of bits set starting from bit up to bit + nr_bits - 1. | |
2337 | */ | |
2338 | static int dmz_count_bits(void *bitmap, int bit, int nr_bits) | |
2339 | { | |
2340 | unsigned long *addr; | |
2341 | int end = bit + nr_bits; | |
2342 | int n = 0; | |
2343 | ||
2344 | while (bit < end) { | |
2345 | if (((bit & (BITS_PER_LONG - 1)) == 0) && | |
2346 | ((end - bit) >= BITS_PER_LONG)) { | |
2347 | addr = (unsigned long *)bitmap + BIT_WORD(bit); | |
2348 | if (*addr == ULONG_MAX) { | |
2349 | n += BITS_PER_LONG; | |
2350 | bit += BITS_PER_LONG; | |
2351 | continue; | |
2352 | } | |
2353 | } | |
2354 | ||
2355 | if (test_bit(bit, bitmap)) | |
2356 | n++; | |
2357 | bit++; | |
2358 | } | |
2359 | ||
2360 | return n; | |
2361 | } | |
2362 | ||
2363 | /* | |
2364 | * Get a zone weight. | |
2365 | */ | |
2366 | static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone) | |
2367 | { | |
2368 | struct dmz_mblock *mblk; | |
2369 | sector_t chunk_block = 0; | |
2370 | unsigned int bit, nr_bits; | |
36820560 | 2371 | unsigned int nr_blocks = zmd->zone_nr_blocks; |
3b1a94c8 DLM |
2372 | void *bitmap; |
2373 | int n = 0; | |
2374 | ||
2375 | while (nr_blocks) { | |
2376 | /* Get bitmap block */ | |
2377 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2378 | if (IS_ERR(mblk)) { | |
2379 | n = 0; | |
2380 | break; | |
2381 | } | |
2382 | ||
2383 | /* Count bits in this block */ | |
2384 | bitmap = mblk->data; | |
2385 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
b3996295 | 2386 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
3b1a94c8 DLM |
2387 | n += dmz_count_bits(bitmap, bit, nr_bits); |
2388 | ||
2389 | dmz_release_mblock(zmd, mblk); | |
2390 | ||
2391 | nr_blocks -= nr_bits; | |
2392 | chunk_block += nr_bits; | |
2393 | } | |
2394 | ||
2395 | zone->weight = n; | |
2396 | } | |
2397 | ||
2398 | /* | |
2399 | * Cleanup the zoned metadata resources. | |
2400 | */ | |
2401 | static void dmz_cleanup_metadata(struct dmz_metadata *zmd) | |
2402 | { | |
2403 | struct rb_root *root; | |
2404 | struct dmz_mblock *mblk, *next; | |
2405 | int i; | |
2406 | ||
2407 | /* Release zone mapping resources */ | |
2408 | if (zmd->map_mblk) { | |
2409 | for (i = 0; i < zmd->nr_map_blocks; i++) | |
2410 | dmz_release_mblock(zmd, zmd->map_mblk[i]); | |
2411 | kfree(zmd->map_mblk); | |
2412 | zmd->map_mblk = NULL; | |
2413 | } | |
2414 | ||
2415 | /* Release super blocks */ | |
2416 | for (i = 0; i < 2; i++) { | |
2417 | if (zmd->sb[i].mblk) { | |
2418 | dmz_free_mblock(zmd, zmd->sb[i].mblk); | |
2419 | zmd->sb[i].mblk = NULL; | |
2420 | } | |
2421 | } | |
2422 | ||
2423 | /* Free cached blocks */ | |
2424 | while (!list_empty(&zmd->mblk_dirty_list)) { | |
2425 | mblk = list_first_entry(&zmd->mblk_dirty_list, | |
2426 | struct dmz_mblock, link); | |
2427 | dmz_dev_warn(zmd->dev, "mblock %llu still in dirty list (ref %u)", | |
33c2865f | 2428 | (u64)mblk->no, mblk->ref); |
3b1a94c8 DLM |
2429 | list_del_init(&mblk->link); |
2430 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
2431 | dmz_free_mblock(zmd, mblk); | |
2432 | } | |
2433 | ||
2434 | while (!list_empty(&zmd->mblk_lru_list)) { | |
2435 | mblk = list_first_entry(&zmd->mblk_lru_list, | |
2436 | struct dmz_mblock, link); | |
2437 | list_del_init(&mblk->link); | |
2438 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
2439 | dmz_free_mblock(zmd, mblk); | |
2440 | } | |
2441 | ||
2442 | /* Sanity checks: the mblock rbtree should now be empty */ | |
2443 | root = &zmd->mblk_rbtree; | |
2444 | rbtree_postorder_for_each_entry_safe(mblk, next, root, node) { | |
2445 | dmz_dev_warn(zmd->dev, "mblock %llu ref %u still in rbtree", | |
33c2865f DLM |
2446 | (u64)mblk->no, mblk->ref); |
2447 | mblk->ref = 0; | |
3b1a94c8 DLM |
2448 | dmz_free_mblock(zmd, mblk); |
2449 | } | |
2450 | ||
2451 | /* Free the zone descriptors */ | |
2452 | dmz_drop_zones(zmd); | |
d5ffebdd MS |
2453 | |
2454 | mutex_destroy(&zmd->mblk_flush_lock); | |
2455 | mutex_destroy(&zmd->map_lock); | |
3b1a94c8 DLM |
2456 | } |
2457 | ||
2458 | /* | |
2459 | * Initialize the zoned metadata. | |
2460 | */ | |
2234e732 HR |
2461 | int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **metadata, |
2462 | const char *devname) | |
3b1a94c8 DLM |
2463 | { |
2464 | struct dmz_metadata *zmd; | |
b7122873 | 2465 | unsigned int i; |
3b1a94c8 DLM |
2466 | struct dm_zone *zone; |
2467 | int ret; | |
2468 | ||
2469 | zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL); | |
2470 | if (!zmd) | |
2471 | return -ENOMEM; | |
2472 | ||
2234e732 | 2473 | strcpy(zmd->devname, devname); |
3b1a94c8 DLM |
2474 | zmd->dev = dev; |
2475 | zmd->mblk_rbtree = RB_ROOT; | |
2476 | init_rwsem(&zmd->mblk_sem); | |
2477 | mutex_init(&zmd->mblk_flush_lock); | |
2478 | spin_lock_init(&zmd->mblk_lock); | |
2479 | INIT_LIST_HEAD(&zmd->mblk_lru_list); | |
2480 | INIT_LIST_HEAD(&zmd->mblk_dirty_list); | |
2481 | ||
2482 | mutex_init(&zmd->map_lock); | |
2483 | atomic_set(&zmd->unmap_nr_rnd, 0); | |
2484 | INIT_LIST_HEAD(&zmd->unmap_rnd_list); | |
2485 | INIT_LIST_HEAD(&zmd->map_rnd_list); | |
2486 | ||
2487 | atomic_set(&zmd->unmap_nr_seq, 0); | |
2488 | INIT_LIST_HEAD(&zmd->unmap_seq_list); | |
2489 | INIT_LIST_HEAD(&zmd->map_seq_list); | |
2490 | ||
2491 | atomic_set(&zmd->nr_reserved_seq_zones, 0); | |
2492 | INIT_LIST_HEAD(&zmd->reserved_seq_zones_list); | |
2493 | ||
2494 | init_waitqueue_head(&zmd->free_wq); | |
2495 | ||
2496 | /* Initialize zone descriptors */ | |
2497 | ret = dmz_init_zones(zmd); | |
2498 | if (ret) | |
2499 | goto err; | |
2500 | ||
2501 | /* Get super block */ | |
2502 | ret = dmz_load_sb(zmd); | |
2503 | if (ret) | |
2504 | goto err; | |
2505 | ||
2506 | /* Set metadata zones starting from sb_zone */ | |
3b1a94c8 | 2507 | for (i = 0; i < zmd->nr_meta_zones << 1; i++) { |
735bd7e4 | 2508 | zone = dmz_get(zmd, zmd->sb[0].zone->id + i); |
3b1a94c8 DLM |
2509 | if (!dmz_is_rnd(zone)) |
2510 | goto err; | |
2511 | set_bit(DMZ_META, &zone->flags); | |
2512 | } | |
2513 | ||
2514 | /* Load mapping table */ | |
2515 | ret = dmz_load_mapping(zmd); | |
2516 | if (ret) | |
2517 | goto err; | |
2518 | ||
2519 | /* | |
2520 | * Cache size boundaries: allow at least 2 super blocks, the chunk map | |
2521 | * blocks and enough blocks to be able to cache the bitmap blocks of | |
2522 | * up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow | |
2523 | * the cache to add 512 more metadata blocks. | |
2524 | */ | |
2525 | zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16; | |
2526 | zmd->max_nr_mblks = zmd->min_nr_mblks + 512; | |
2527 | zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count; | |
2528 | zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan; | |
2529 | zmd->mblk_shrinker.seeks = DEFAULT_SEEKS; | |
2530 | ||
2531 | /* Metadata cache shrinker */ | |
2532 | ret = register_shrinker(&zmd->mblk_shrinker); | |
2533 | if (ret) { | |
2534 | dmz_dev_err(dev, "Register metadata cache shrinker failed"); | |
2535 | goto err; | |
2536 | } | |
2537 | ||
2538 | dmz_dev_info(dev, "Host-%s zoned block device", | |
2539 | bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ? | |
2540 | "aware" : "managed"); | |
2541 | dmz_dev_info(dev, " %llu 512-byte logical sectors", | |
2542 | (u64)dev->capacity); | |
2543 | dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors", | |
36820560 | 2544 | zmd->nr_zones, (u64)zmd->zone_nr_sectors); |
3b1a94c8 DLM |
2545 | dmz_dev_info(dev, " %u metadata zones", |
2546 | zmd->nr_meta_zones * 2); | |
2547 | dmz_dev_info(dev, " %u data zones for %u chunks", | |
2548 | zmd->nr_data_zones, zmd->nr_chunks); | |
2549 | dmz_dev_info(dev, " %u random zones (%u unmapped)", | |
2550 | zmd->nr_rnd, atomic_read(&zmd->unmap_nr_rnd)); | |
2551 | dmz_dev_info(dev, " %u sequential zones (%u unmapped)", | |
2552 | zmd->nr_seq, atomic_read(&zmd->unmap_nr_seq)); | |
2553 | dmz_dev_info(dev, " %u reserved sequential data zones", | |
2554 | zmd->nr_reserved_seq); | |
2555 | ||
2556 | dmz_dev_debug(dev, "Format:"); | |
2557 | dmz_dev_debug(dev, "%u metadata blocks per set (%u max cache)", | |
2558 | zmd->nr_meta_blocks, zmd->max_nr_mblks); | |
2559 | dmz_dev_debug(dev, " %u data zone mapping blocks", | |
2560 | zmd->nr_map_blocks); | |
2561 | dmz_dev_debug(dev, " %u bitmap blocks", | |
2562 | zmd->nr_bitmap_blocks); | |
2563 | ||
2564 | *metadata = zmd; | |
2565 | ||
2566 | return 0; | |
2567 | err: | |
2568 | dmz_cleanup_metadata(zmd); | |
2569 | kfree(zmd); | |
2570 | *metadata = NULL; | |
2571 | ||
2572 | return ret; | |
2573 | } | |
2574 | ||
2575 | /* | |
2576 | * Cleanup the zoned metadata resources. | |
2577 | */ | |
2578 | void dmz_dtr_metadata(struct dmz_metadata *zmd) | |
2579 | { | |
2580 | unregister_shrinker(&zmd->mblk_shrinker); | |
2581 | dmz_cleanup_metadata(zmd); | |
2582 | kfree(zmd); | |
2583 | } | |
2584 | ||
2585 | /* | |
2586 | * Check zone information on resume. | |
2587 | */ | |
2588 | int dmz_resume_metadata(struct dmz_metadata *zmd) | |
2589 | { | |
2590 | struct dmz_dev *dev = zmd->dev; | |
2591 | struct dm_zone *zone; | |
2592 | sector_t wp_block; | |
2593 | unsigned int i; | |
2594 | int ret; | |
2595 | ||
2596 | /* Check zones */ | |
36820560 | 2597 | for (i = 0; i < zmd->nr_zones; i++) { |
3b1a94c8 DLM |
2598 | zone = dmz_get(zmd, i); |
2599 | if (!zone) { | |
2600 | dmz_dev_err(dev, "Unable to get zone %u", i); | |
2601 | return -EIO; | |
2602 | } | |
2603 | ||
2604 | wp_block = zone->wp_block; | |
2605 | ||
2606 | ret = dmz_update_zone(zmd, zone); | |
2607 | if (ret) { | |
2608 | dmz_dev_err(dev, "Broken zone %u", i); | |
2609 | return ret; | |
2610 | } | |
2611 | ||
2612 | if (dmz_is_offline(zone)) { | |
2613 | dmz_dev_warn(dev, "Zone %u is offline", i); | |
2614 | continue; | |
2615 | } | |
2616 | ||
2617 | /* Check write pointer */ | |
2618 | if (!dmz_is_seq(zone)) | |
2619 | zone->wp_block = 0; | |
2620 | else if (zone->wp_block != wp_block) { | |
2621 | dmz_dev_err(dev, "Zone %u: Invalid wp (%llu / %llu)", | |
2622 | i, (u64)zone->wp_block, (u64)wp_block); | |
2623 | zone->wp_block = wp_block; | |
2624 | dmz_invalidate_blocks(zmd, zone, zone->wp_block, | |
36820560 | 2625 | zmd->zone_nr_blocks - zone->wp_block); |
3b1a94c8 DLM |
2626 | } |
2627 | } | |
2628 | ||
2629 | return 0; | |
2630 | } |