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