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3b1a94c8 DLM |
1 | /* |
2 | * Copyright (C) 2017 Western Digital Corporation or its affiliates. | |
3 | * | |
4 | * This file is released under the GPL. | |
5 | */ | |
6 | ||
7 | #include "dm-zoned.h" | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/crc32.h> | |
11 | ||
12 | #define DM_MSG_PREFIX "zoned metadata" | |
13 | ||
14 | /* | |
15 | * Metadata version. | |
16 | */ | |
17 | #define DMZ_META_VER 1 | |
18 | ||
19 | /* | |
20 | * On-disk super block magic. | |
21 | */ | |
22 | #define DMZ_MAGIC ((((unsigned int)('D')) << 24) | \ | |
23 | (((unsigned int)('Z')) << 16) | \ | |
24 | (((unsigned int)('B')) << 8) | \ | |
25 | ((unsigned int)('D'))) | |
26 | ||
27 | /* | |
28 | * On disk super block. | |
29 | * This uses only 512 B but uses on disk a full 4KB block. This block is | |
30 | * followed on disk by the mapping table of chunks to zones and the bitmap | |
31 | * blocks indicating zone block validity. | |
32 | * The overall resulting metadata format is: | |
33 | * (1) Super block (1 block) | |
34 | * (2) Chunk mapping table (nr_map_blocks) | |
35 | * (3) Bitmap blocks (nr_bitmap_blocks) | |
36 | * All metadata blocks are stored in conventional zones, starting from the | |
37 | * the first conventional zone found on disk. | |
38 | */ | |
39 | struct dmz_super { | |
40 | /* Magic number */ | |
41 | __le32 magic; /* 4 */ | |
42 | ||
43 | /* Metadata version number */ | |
44 | __le32 version; /* 8 */ | |
45 | ||
46 | /* Generation number */ | |
47 | __le64 gen; /* 16 */ | |
48 | ||
49 | /* This block number */ | |
50 | __le64 sb_block; /* 24 */ | |
51 | ||
52 | /* The number of metadata blocks, including this super block */ | |
53 | __le32 nr_meta_blocks; /* 28 */ | |
54 | ||
55 | /* The number of sequential zones reserved for reclaim */ | |
56 | __le32 nr_reserved_seq; /* 32 */ | |
57 | ||
58 | /* The number of entries in the mapping table */ | |
59 | __le32 nr_chunks; /* 36 */ | |
60 | ||
61 | /* The number of blocks used for the chunk mapping table */ | |
62 | __le32 nr_map_blocks; /* 40 */ | |
63 | ||
64 | /* The number of blocks used for the block bitmaps */ | |
65 | __le32 nr_bitmap_blocks; /* 44 */ | |
66 | ||
67 | /* Checksum */ | |
68 | __le32 crc; /* 48 */ | |
69 | ||
70 | /* Padding to full 512B sector */ | |
71 | u8 reserved[464]; /* 512 */ | |
72 | }; | |
73 | ||
74 | /* | |
75 | * Chunk mapping entry: entries are indexed by chunk number | |
76 | * and give the zone ID (dzone_id) mapping the chunk on disk. | |
77 | * This zone may be sequential or random. If it is a sequential | |
78 | * zone, a second zone (bzone_id) used as a write buffer may | |
79 | * also be specified. This second zone will always be a randomly | |
80 | * writeable zone. | |
81 | */ | |
82 | struct dmz_map { | |
83 | __le32 dzone_id; | |
84 | __le32 bzone_id; | |
85 | }; | |
86 | ||
87 | /* | |
88 | * Chunk mapping table metadata: 512 8-bytes entries per 4KB block. | |
89 | */ | |
90 | #define DMZ_MAP_ENTRIES (DMZ_BLOCK_SIZE / sizeof(struct dmz_map)) | |
91 | #define DMZ_MAP_ENTRIES_SHIFT (ilog2(DMZ_MAP_ENTRIES)) | |
92 | #define DMZ_MAP_ENTRIES_MASK (DMZ_MAP_ENTRIES - 1) | |
93 | #define DMZ_MAP_UNMAPPED UINT_MAX | |
94 | ||
95 | /* | |
96 | * Meta data block descriptor (for cached metadata blocks). | |
97 | */ | |
98 | struct dmz_mblock { | |
99 | struct rb_node node; | |
100 | struct list_head link; | |
101 | sector_t no; | |
102 | atomic_t ref; | |
103 | unsigned long state; | |
104 | struct page *page; | |
105 | void *data; | |
106 | }; | |
107 | ||
108 | /* | |
109 | * Metadata block state flags. | |
110 | */ | |
111 | enum { | |
112 | DMZ_META_DIRTY, | |
113 | DMZ_META_READING, | |
114 | DMZ_META_WRITING, | |
115 | DMZ_META_ERROR, | |
116 | }; | |
117 | ||
118 | /* | |
119 | * Super block information (one per metadata set). | |
120 | */ | |
121 | struct dmz_sb { | |
122 | sector_t block; | |
123 | struct dmz_mblock *mblk; | |
124 | struct dmz_super *sb; | |
125 | }; | |
126 | ||
127 | /* | |
128 | * In-memory metadata. | |
129 | */ | |
130 | struct dmz_metadata { | |
131 | struct dmz_dev *dev; | |
132 | ||
133 | sector_t zone_bitmap_size; | |
134 | unsigned int zone_nr_bitmap_blocks; | |
135 | ||
136 | unsigned int nr_bitmap_blocks; | |
137 | unsigned int nr_map_blocks; | |
138 | ||
139 | unsigned int nr_useable_zones; | |
140 | unsigned int nr_meta_blocks; | |
141 | unsigned int nr_meta_zones; | |
142 | unsigned int nr_data_zones; | |
143 | unsigned int nr_rnd_zones; | |
144 | unsigned int nr_reserved_seq; | |
145 | unsigned int nr_chunks; | |
146 | ||
147 | /* Zone information array */ | |
148 | struct dm_zone *zones; | |
149 | ||
150 | struct dm_zone *sb_zone; | |
151 | struct dmz_sb sb[2]; | |
152 | unsigned int mblk_primary; | |
153 | u64 sb_gen; | |
154 | unsigned int min_nr_mblks; | |
155 | unsigned int max_nr_mblks; | |
156 | atomic_t nr_mblks; | |
157 | struct rw_semaphore mblk_sem; | |
158 | struct mutex mblk_flush_lock; | |
159 | spinlock_t mblk_lock; | |
160 | struct rb_root mblk_rbtree; | |
161 | struct list_head mblk_lru_list; | |
162 | struct list_head mblk_dirty_list; | |
163 | struct shrinker mblk_shrinker; | |
164 | ||
165 | /* Zone allocation management */ | |
166 | struct mutex map_lock; | |
167 | struct dmz_mblock **map_mblk; | |
168 | unsigned int nr_rnd; | |
169 | atomic_t unmap_nr_rnd; | |
170 | struct list_head unmap_rnd_list; | |
171 | struct list_head map_rnd_list; | |
172 | ||
173 | unsigned int nr_seq; | |
174 | atomic_t unmap_nr_seq; | |
175 | struct list_head unmap_seq_list; | |
176 | struct list_head map_seq_list; | |
177 | ||
178 | atomic_t nr_reserved_seq_zones; | |
179 | struct list_head reserved_seq_zones_list; | |
180 | ||
181 | wait_queue_head_t free_wq; | |
182 | }; | |
183 | ||
184 | /* | |
185 | * Various accessors | |
186 | */ | |
187 | unsigned int dmz_id(struct dmz_metadata *zmd, struct dm_zone *zone) | |
188 | { | |
189 | return ((unsigned int)(zone - zmd->zones)); | |
190 | } | |
191 | ||
192 | sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone) | |
193 | { | |
3908c983 | 194 | return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_sectors_shift; |
3b1a94c8 DLM |
195 | } |
196 | ||
197 | sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone) | |
198 | { | |
3908c983 | 199 | return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_blocks_shift; |
3b1a94c8 DLM |
200 | } |
201 | ||
202 | unsigned int dmz_nr_chunks(struct dmz_metadata *zmd) | |
203 | { | |
204 | return zmd->nr_chunks; | |
205 | } | |
206 | ||
207 | unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd) | |
208 | { | |
209 | return zmd->nr_rnd; | |
210 | } | |
211 | ||
212 | unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd) | |
213 | { | |
214 | return atomic_read(&zmd->unmap_nr_rnd); | |
215 | } | |
216 | ||
217 | /* | |
218 | * Lock/unlock mapping table. | |
219 | * The map lock also protects all the zone lists. | |
220 | */ | |
221 | void dmz_lock_map(struct dmz_metadata *zmd) | |
222 | { | |
223 | mutex_lock(&zmd->map_lock); | |
224 | } | |
225 | ||
226 | void dmz_unlock_map(struct dmz_metadata *zmd) | |
227 | { | |
228 | mutex_unlock(&zmd->map_lock); | |
229 | } | |
230 | ||
231 | /* | |
232 | * Lock/unlock metadata access. This is a "read" lock on a semaphore | |
233 | * that prevents metadata flush from running while metadata are being | |
234 | * modified. The actual metadata write mutual exclusion is achieved with | |
235 | * the map lock and zone styate management (active and reclaim state are | |
236 | * mutually exclusive). | |
237 | */ | |
238 | void dmz_lock_metadata(struct dmz_metadata *zmd) | |
239 | { | |
240 | down_read(&zmd->mblk_sem); | |
241 | } | |
242 | ||
243 | void dmz_unlock_metadata(struct dmz_metadata *zmd) | |
244 | { | |
245 | up_read(&zmd->mblk_sem); | |
246 | } | |
247 | ||
248 | /* | |
249 | * Lock/unlock flush: prevent concurrent executions | |
250 | * of dmz_flush_metadata as well as metadata modification in reclaim | |
251 | * while flush is being executed. | |
252 | */ | |
253 | void dmz_lock_flush(struct dmz_metadata *zmd) | |
254 | { | |
255 | mutex_lock(&zmd->mblk_flush_lock); | |
256 | } | |
257 | ||
258 | void dmz_unlock_flush(struct dmz_metadata *zmd) | |
259 | { | |
260 | mutex_unlock(&zmd->mblk_flush_lock); | |
261 | } | |
262 | ||
263 | /* | |
264 | * Allocate a metadata block. | |
265 | */ | |
266 | static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd, | |
267 | sector_t mblk_no) | |
268 | { | |
269 | struct dmz_mblock *mblk = NULL; | |
270 | ||
271 | /* See if we can reuse cached blocks */ | |
272 | if (zmd->max_nr_mblks && atomic_read(&zmd->nr_mblks) > zmd->max_nr_mblks) { | |
273 | spin_lock(&zmd->mblk_lock); | |
274 | mblk = list_first_entry_or_null(&zmd->mblk_lru_list, | |
275 | struct dmz_mblock, link); | |
276 | if (mblk) { | |
277 | list_del_init(&mblk->link); | |
278 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
279 | mblk->no = mblk_no; | |
280 | } | |
281 | spin_unlock(&zmd->mblk_lock); | |
282 | if (mblk) | |
283 | return mblk; | |
284 | } | |
285 | ||
286 | /* Allocate a new block */ | |
287 | mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO); | |
288 | if (!mblk) | |
289 | return NULL; | |
290 | ||
291 | mblk->page = alloc_page(GFP_NOIO); | |
292 | if (!mblk->page) { | |
293 | kfree(mblk); | |
294 | return NULL; | |
295 | } | |
296 | ||
297 | RB_CLEAR_NODE(&mblk->node); | |
298 | INIT_LIST_HEAD(&mblk->link); | |
299 | atomic_set(&mblk->ref, 0); | |
300 | mblk->state = 0; | |
301 | mblk->no = mblk_no; | |
302 | mblk->data = page_address(mblk->page); | |
303 | ||
304 | atomic_inc(&zmd->nr_mblks); | |
305 | ||
306 | return mblk; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Free a metadata block. | |
311 | */ | |
312 | static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) | |
313 | { | |
314 | __free_pages(mblk->page, 0); | |
315 | kfree(mblk); | |
316 | ||
317 | atomic_dec(&zmd->nr_mblks); | |
318 | } | |
319 | ||
320 | /* | |
321 | * Insert a metadata block in the rbtree. | |
322 | */ | |
323 | static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) | |
324 | { | |
325 | struct rb_root *root = &zmd->mblk_rbtree; | |
326 | struct rb_node **new = &(root->rb_node), *parent = NULL; | |
327 | struct dmz_mblock *b; | |
328 | ||
329 | /* Figure out where to put the new node */ | |
330 | while (*new) { | |
331 | b = container_of(*new, struct dmz_mblock, node); | |
332 | parent = *new; | |
333 | new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right); | |
334 | } | |
335 | ||
336 | /* Add new node and rebalance tree */ | |
337 | rb_link_node(&mblk->node, parent, new); | |
338 | rb_insert_color(&mblk->node, root); | |
339 | } | |
340 | ||
341 | /* | |
342 | * Lookup a metadata block in the rbtree. | |
343 | */ | |
344 | static struct dmz_mblock *dmz_lookup_mblock(struct dmz_metadata *zmd, | |
345 | sector_t mblk_no) | |
346 | { | |
347 | struct rb_root *root = &zmd->mblk_rbtree; | |
348 | struct rb_node *node = root->rb_node; | |
349 | struct dmz_mblock *mblk; | |
350 | ||
351 | while (node) { | |
352 | mblk = container_of(node, struct dmz_mblock, node); | |
353 | if (mblk->no == mblk_no) | |
354 | return mblk; | |
355 | node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right; | |
356 | } | |
357 | ||
358 | return NULL; | |
359 | } | |
360 | ||
361 | /* | |
362 | * Metadata block BIO end callback. | |
363 | */ | |
364 | static void dmz_mblock_bio_end_io(struct bio *bio) | |
365 | { | |
366 | struct dmz_mblock *mblk = bio->bi_private; | |
367 | int flag; | |
368 | ||
369 | if (bio->bi_status) | |
370 | set_bit(DMZ_META_ERROR, &mblk->state); | |
371 | ||
372 | if (bio_op(bio) == REQ_OP_WRITE) | |
373 | flag = DMZ_META_WRITING; | |
374 | else | |
375 | flag = DMZ_META_READING; | |
376 | ||
377 | clear_bit_unlock(flag, &mblk->state); | |
378 | smp_mb__after_atomic(); | |
379 | wake_up_bit(&mblk->state, flag); | |
380 | ||
381 | bio_put(bio); | |
382 | } | |
383 | ||
384 | /* | |
385 | * Read a metadata block from disk. | |
386 | */ | |
387 | static struct dmz_mblock *dmz_fetch_mblock(struct dmz_metadata *zmd, | |
388 | sector_t mblk_no) | |
389 | { | |
390 | struct dmz_mblock *mblk; | |
391 | sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no; | |
392 | struct bio *bio; | |
393 | ||
394 | /* Get block and insert it */ | |
395 | mblk = dmz_alloc_mblock(zmd, mblk_no); | |
396 | if (!mblk) | |
397 | return NULL; | |
398 | ||
399 | spin_lock(&zmd->mblk_lock); | |
400 | atomic_inc(&mblk->ref); | |
401 | set_bit(DMZ_META_READING, &mblk->state); | |
402 | dmz_insert_mblock(zmd, mblk); | |
403 | spin_unlock(&zmd->mblk_lock); | |
404 | ||
405 | bio = bio_alloc(GFP_NOIO, 1); | |
406 | if (!bio) { | |
407 | dmz_free_mblock(zmd, mblk); | |
408 | return NULL; | |
409 | } | |
410 | ||
411 | bio->bi_iter.bi_sector = dmz_blk2sect(block); | |
412 | bio->bi_bdev = zmd->dev->bdev; | |
413 | bio->bi_private = mblk; | |
414 | bio->bi_end_io = dmz_mblock_bio_end_io; | |
415 | bio_set_op_attrs(bio, REQ_OP_READ, REQ_META | REQ_PRIO); | |
416 | bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); | |
417 | submit_bio(bio); | |
418 | ||
419 | return mblk; | |
420 | } | |
421 | ||
422 | /* | |
423 | * Free metadata blocks. | |
424 | */ | |
425 | static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd, | |
426 | unsigned long limit) | |
427 | { | |
428 | struct dmz_mblock *mblk; | |
429 | unsigned long count = 0; | |
430 | ||
431 | if (!zmd->max_nr_mblks) | |
432 | return 0; | |
433 | ||
434 | while (!list_empty(&zmd->mblk_lru_list) && | |
435 | atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks && | |
436 | count < limit) { | |
437 | mblk = list_first_entry(&zmd->mblk_lru_list, | |
438 | struct dmz_mblock, link); | |
439 | list_del_init(&mblk->link); | |
440 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
441 | dmz_free_mblock(zmd, mblk); | |
442 | count++; | |
443 | } | |
444 | ||
445 | return count; | |
446 | } | |
447 | ||
448 | /* | |
449 | * For mblock shrinker: get the number of unused metadata blocks in the cache. | |
450 | */ | |
451 | static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink, | |
452 | struct shrink_control *sc) | |
453 | { | |
454 | struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); | |
455 | ||
456 | return atomic_read(&zmd->nr_mblks); | |
457 | } | |
458 | ||
459 | /* | |
460 | * For mblock shrinker: scan unused metadata blocks and shrink the cache. | |
461 | */ | |
462 | static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink, | |
463 | struct shrink_control *sc) | |
464 | { | |
465 | struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); | |
466 | unsigned long count; | |
467 | ||
468 | spin_lock(&zmd->mblk_lock); | |
469 | count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan); | |
470 | spin_unlock(&zmd->mblk_lock); | |
471 | ||
472 | return count ? count : SHRINK_STOP; | |
473 | } | |
474 | ||
475 | /* | |
476 | * Release a metadata block. | |
477 | */ | |
478 | static void dmz_release_mblock(struct dmz_metadata *zmd, | |
479 | struct dmz_mblock *mblk) | |
480 | { | |
481 | ||
482 | if (!mblk) | |
483 | return; | |
484 | ||
485 | spin_lock(&zmd->mblk_lock); | |
486 | ||
487 | if (atomic_dec_and_test(&mblk->ref)) { | |
488 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { | |
489 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
490 | dmz_free_mblock(zmd, mblk); | |
491 | } else if (!test_bit(DMZ_META_DIRTY, &mblk->state)) { | |
492 | list_add_tail(&mblk->link, &zmd->mblk_lru_list); | |
493 | dmz_shrink_mblock_cache(zmd, 1); | |
494 | } | |
495 | } | |
496 | ||
497 | spin_unlock(&zmd->mblk_lock); | |
498 | } | |
499 | ||
500 | /* | |
501 | * Get a metadata block from the rbtree. If the block | |
502 | * is not present, read it from disk. | |
503 | */ | |
504 | static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd, | |
505 | sector_t mblk_no) | |
506 | { | |
507 | struct dmz_mblock *mblk; | |
508 | ||
509 | /* Check rbtree */ | |
510 | spin_lock(&zmd->mblk_lock); | |
511 | mblk = dmz_lookup_mblock(zmd, mblk_no); | |
512 | if (mblk) { | |
513 | /* Cache hit: remove block from LRU list */ | |
514 | if (atomic_inc_return(&mblk->ref) == 1 && | |
515 | !test_bit(DMZ_META_DIRTY, &mblk->state)) | |
516 | list_del_init(&mblk->link); | |
517 | } | |
518 | spin_unlock(&zmd->mblk_lock); | |
519 | ||
520 | if (!mblk) { | |
521 | /* Cache miss: read the block from disk */ | |
522 | mblk = dmz_fetch_mblock(zmd, mblk_no); | |
523 | if (!mblk) | |
524 | return ERR_PTR(-ENOMEM); | |
525 | } | |
526 | ||
527 | /* Wait for on-going read I/O and check for error */ | |
528 | wait_on_bit_io(&mblk->state, DMZ_META_READING, | |
529 | TASK_UNINTERRUPTIBLE); | |
530 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { | |
531 | dmz_release_mblock(zmd, mblk); | |
532 | return ERR_PTR(-EIO); | |
533 | } | |
534 | ||
535 | return mblk; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Mark a metadata block dirty. | |
540 | */ | |
541 | static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) | |
542 | { | |
543 | spin_lock(&zmd->mblk_lock); | |
544 | if (!test_and_set_bit(DMZ_META_DIRTY, &mblk->state)) | |
545 | list_add_tail(&mblk->link, &zmd->mblk_dirty_list); | |
546 | spin_unlock(&zmd->mblk_lock); | |
547 | } | |
548 | ||
549 | /* | |
550 | * Issue a metadata block write BIO. | |
551 | */ | |
552 | static void dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk, | |
553 | unsigned int set) | |
554 | { | |
555 | sector_t block = zmd->sb[set].block + mblk->no; | |
556 | struct bio *bio; | |
557 | ||
558 | bio = bio_alloc(GFP_NOIO, 1); | |
559 | if (!bio) { | |
560 | set_bit(DMZ_META_ERROR, &mblk->state); | |
561 | return; | |
562 | } | |
563 | ||
564 | set_bit(DMZ_META_WRITING, &mblk->state); | |
565 | ||
566 | bio->bi_iter.bi_sector = dmz_blk2sect(block); | |
567 | bio->bi_bdev = zmd->dev->bdev; | |
568 | bio->bi_private = mblk; | |
569 | bio->bi_end_io = dmz_mblock_bio_end_io; | |
570 | bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_META | REQ_PRIO); | |
571 | bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); | |
572 | submit_bio(bio); | |
573 | } | |
574 | ||
575 | /* | |
576 | * Read/write a metadata block. | |
577 | */ | |
578 | static int dmz_rdwr_block(struct dmz_metadata *zmd, int op, sector_t block, | |
579 | struct page *page) | |
580 | { | |
581 | struct bio *bio; | |
582 | int ret; | |
583 | ||
584 | bio = bio_alloc(GFP_NOIO, 1); | |
585 | if (!bio) | |
586 | return -ENOMEM; | |
587 | ||
588 | bio->bi_iter.bi_sector = dmz_blk2sect(block); | |
589 | bio->bi_bdev = zmd->dev->bdev; | |
590 | bio_set_op_attrs(bio, op, REQ_SYNC | REQ_META | REQ_PRIO); | |
591 | bio_add_page(bio, page, DMZ_BLOCK_SIZE, 0); | |
592 | ret = submit_bio_wait(bio); | |
593 | bio_put(bio); | |
594 | ||
595 | return ret; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Write super block of the specified metadata set. | |
600 | */ | |
601 | static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set) | |
602 | { | |
603 | sector_t block = zmd->sb[set].block; | |
604 | struct dmz_mblock *mblk = zmd->sb[set].mblk; | |
605 | struct dmz_super *sb = zmd->sb[set].sb; | |
606 | u64 sb_gen = zmd->sb_gen + 1; | |
607 | int ret; | |
608 | ||
609 | sb->magic = cpu_to_le32(DMZ_MAGIC); | |
610 | sb->version = cpu_to_le32(DMZ_META_VER); | |
611 | ||
612 | sb->gen = cpu_to_le64(sb_gen); | |
613 | ||
614 | sb->sb_block = cpu_to_le64(block); | |
615 | sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks); | |
616 | sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq); | |
617 | sb->nr_chunks = cpu_to_le32(zmd->nr_chunks); | |
618 | ||
619 | sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks); | |
620 | sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks); | |
621 | ||
622 | sb->crc = 0; | |
623 | sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE)); | |
624 | ||
625 | ret = dmz_rdwr_block(zmd, REQ_OP_WRITE, block, mblk->page); | |
626 | if (ret == 0) | |
4218a955 | 627 | ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO, NULL); |
3b1a94c8 DLM |
628 | |
629 | return ret; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Write dirty metadata blocks to the specified set. | |
634 | */ | |
635 | static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd, | |
636 | struct list_head *write_list, | |
637 | unsigned int set) | |
638 | { | |
639 | struct dmz_mblock *mblk; | |
640 | struct blk_plug plug; | |
641 | int ret = 0; | |
642 | ||
643 | /* Issue writes */ | |
644 | blk_start_plug(&plug); | |
645 | list_for_each_entry(mblk, write_list, link) | |
646 | dmz_write_mblock(zmd, mblk, set); | |
647 | blk_finish_plug(&plug); | |
648 | ||
649 | /* Wait for completion */ | |
650 | list_for_each_entry(mblk, write_list, link) { | |
651 | wait_on_bit_io(&mblk->state, DMZ_META_WRITING, | |
652 | TASK_UNINTERRUPTIBLE); | |
653 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { | |
654 | clear_bit(DMZ_META_ERROR, &mblk->state); | |
655 | ret = -EIO; | |
656 | } | |
657 | } | |
658 | ||
659 | /* Flush drive cache (this will also sync data) */ | |
660 | if (ret == 0) | |
4218a955 | 661 | ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO, NULL); |
3b1a94c8 DLM |
662 | |
663 | return ret; | |
664 | } | |
665 | ||
666 | /* | |
667 | * Log dirty metadata blocks. | |
668 | */ | |
669 | static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd, | |
670 | struct list_head *write_list) | |
671 | { | |
672 | unsigned int log_set = zmd->mblk_primary ^ 0x1; | |
673 | int ret; | |
674 | ||
675 | /* Write dirty blocks to the log */ | |
676 | ret = dmz_write_dirty_mblocks(zmd, write_list, log_set); | |
677 | if (ret) | |
678 | return ret; | |
679 | ||
680 | /* | |
681 | * No error so far: now validate the log by updating the | |
682 | * log index super block generation. | |
683 | */ | |
684 | ret = dmz_write_sb(zmd, log_set); | |
685 | if (ret) | |
686 | return ret; | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
691 | /* | |
692 | * Flush dirty metadata blocks. | |
693 | */ | |
694 | int dmz_flush_metadata(struct dmz_metadata *zmd) | |
695 | { | |
696 | struct dmz_mblock *mblk; | |
697 | struct list_head write_list; | |
698 | int ret; | |
699 | ||
700 | if (WARN_ON(!zmd)) | |
701 | return 0; | |
702 | ||
703 | INIT_LIST_HEAD(&write_list); | |
704 | ||
705 | /* | |
706 | * Make sure that metadata blocks are stable before logging: take | |
707 | * the write lock on the metadata semaphore to prevent target BIOs | |
708 | * from modifying metadata. | |
709 | */ | |
710 | down_write(&zmd->mblk_sem); | |
711 | ||
712 | /* | |
713 | * This is called from the target flush work and reclaim work. | |
714 | * Concurrent execution is not allowed. | |
715 | */ | |
716 | dmz_lock_flush(zmd); | |
717 | ||
718 | /* Get dirty blocks */ | |
719 | spin_lock(&zmd->mblk_lock); | |
720 | list_splice_init(&zmd->mblk_dirty_list, &write_list); | |
721 | spin_unlock(&zmd->mblk_lock); | |
722 | ||
723 | /* If there are no dirty metadata blocks, just flush the device cache */ | |
724 | if (list_empty(&write_list)) { | |
4218a955 | 725 | ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO, NULL); |
3b1a94c8 DLM |
726 | goto out; |
727 | } | |
728 | ||
729 | /* | |
730 | * The primary metadata set is still clean. Keep it this way until | |
731 | * all updates are successful in the secondary set. That is, use | |
732 | * the secondary set as a log. | |
733 | */ | |
734 | ret = dmz_log_dirty_mblocks(zmd, &write_list); | |
735 | if (ret) | |
736 | goto out; | |
737 | ||
738 | /* | |
739 | * The log is on disk. It is now safe to update in place | |
740 | * in the primary metadata set. | |
741 | */ | |
742 | ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary); | |
743 | if (ret) | |
744 | goto out; | |
745 | ||
746 | ret = dmz_write_sb(zmd, zmd->mblk_primary); | |
747 | if (ret) | |
748 | goto out; | |
749 | ||
750 | while (!list_empty(&write_list)) { | |
751 | mblk = list_first_entry(&write_list, struct dmz_mblock, link); | |
752 | list_del_init(&mblk->link); | |
753 | ||
754 | spin_lock(&zmd->mblk_lock); | |
755 | clear_bit(DMZ_META_DIRTY, &mblk->state); | |
756 | if (atomic_read(&mblk->ref) == 0) | |
757 | list_add_tail(&mblk->link, &zmd->mblk_lru_list); | |
758 | spin_unlock(&zmd->mblk_lock); | |
759 | } | |
760 | ||
761 | zmd->sb_gen++; | |
762 | out: | |
763 | if (ret && !list_empty(&write_list)) { | |
764 | spin_lock(&zmd->mblk_lock); | |
765 | list_splice(&write_list, &zmd->mblk_dirty_list); | |
766 | spin_unlock(&zmd->mblk_lock); | |
767 | } | |
768 | ||
769 | dmz_unlock_flush(zmd); | |
770 | up_write(&zmd->mblk_sem); | |
771 | ||
772 | return ret; | |
773 | } | |
774 | ||
775 | /* | |
776 | * Check super block. | |
777 | */ | |
778 | static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_super *sb) | |
779 | { | |
780 | unsigned int nr_meta_zones, nr_data_zones; | |
781 | struct dmz_dev *dev = zmd->dev; | |
782 | u32 crc, stored_crc; | |
783 | u64 gen; | |
784 | ||
785 | gen = le64_to_cpu(sb->gen); | |
786 | stored_crc = le32_to_cpu(sb->crc); | |
787 | sb->crc = 0; | |
788 | crc = crc32_le(gen, (unsigned char *)sb, DMZ_BLOCK_SIZE); | |
789 | if (crc != stored_crc) { | |
790 | dmz_dev_err(dev, "Invalid checksum (needed 0x%08x, got 0x%08x)", | |
791 | crc, stored_crc); | |
792 | return -ENXIO; | |
793 | } | |
794 | ||
795 | if (le32_to_cpu(sb->magic) != DMZ_MAGIC) { | |
796 | dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)", | |
797 | DMZ_MAGIC, le32_to_cpu(sb->magic)); | |
798 | return -ENXIO; | |
799 | } | |
800 | ||
801 | if (le32_to_cpu(sb->version) != DMZ_META_VER) { | |
802 | dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)", | |
803 | DMZ_META_VER, le32_to_cpu(sb->version)); | |
804 | return -ENXIO; | |
805 | } | |
806 | ||
807 | nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + dev->zone_nr_blocks - 1) | |
808 | >> dev->zone_nr_blocks_shift; | |
809 | if (!nr_meta_zones || | |
810 | nr_meta_zones >= zmd->nr_rnd_zones) { | |
811 | dmz_dev_err(dev, "Invalid number of metadata blocks"); | |
812 | return -ENXIO; | |
813 | } | |
814 | ||
815 | if (!le32_to_cpu(sb->nr_reserved_seq) || | |
816 | le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) { | |
817 | dmz_dev_err(dev, "Invalid number of reserved sequential zones"); | |
818 | return -ENXIO; | |
819 | } | |
820 | ||
821 | nr_data_zones = zmd->nr_useable_zones - | |
822 | (nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq)); | |
823 | if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) { | |
824 | dmz_dev_err(dev, "Invalid number of chunks %u / %u", | |
825 | le32_to_cpu(sb->nr_chunks), nr_data_zones); | |
826 | return -ENXIO; | |
827 | } | |
828 | ||
829 | /* OK */ | |
830 | zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks); | |
831 | zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq); | |
832 | zmd->nr_chunks = le32_to_cpu(sb->nr_chunks); | |
833 | zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks); | |
834 | zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks); | |
835 | zmd->nr_meta_zones = nr_meta_zones; | |
836 | zmd->nr_data_zones = nr_data_zones; | |
837 | ||
838 | return 0; | |
839 | } | |
840 | ||
841 | /* | |
842 | * Read the first or second super block from disk. | |
843 | */ | |
844 | static int dmz_read_sb(struct dmz_metadata *zmd, unsigned int set) | |
845 | { | |
846 | return dmz_rdwr_block(zmd, REQ_OP_READ, zmd->sb[set].block, | |
847 | zmd->sb[set].mblk->page); | |
848 | } | |
849 | ||
850 | /* | |
851 | * Determine the position of the secondary super blocks on disk. | |
852 | * This is used only if a corruption of the primary super block | |
853 | * is detected. | |
854 | */ | |
855 | static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd) | |
856 | { | |
857 | unsigned int zone_nr_blocks = zmd->dev->zone_nr_blocks; | |
858 | struct dmz_mblock *mblk; | |
859 | int i; | |
860 | ||
861 | /* Allocate a block */ | |
862 | mblk = dmz_alloc_mblock(zmd, 0); | |
863 | if (!mblk) | |
864 | return -ENOMEM; | |
865 | ||
866 | zmd->sb[1].mblk = mblk; | |
867 | zmd->sb[1].sb = mblk->data; | |
868 | ||
869 | /* Bad first super block: search for the second one */ | |
870 | zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks; | |
871 | for (i = 0; i < zmd->nr_rnd_zones - 1; i++) { | |
872 | if (dmz_read_sb(zmd, 1) != 0) | |
873 | break; | |
874 | if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC) | |
875 | return 0; | |
876 | zmd->sb[1].block += zone_nr_blocks; | |
877 | } | |
878 | ||
879 | dmz_free_mblock(zmd, mblk); | |
880 | zmd->sb[1].mblk = NULL; | |
881 | ||
882 | return -EIO; | |
883 | } | |
884 | ||
885 | /* | |
886 | * Read the first or second super block from disk. | |
887 | */ | |
888 | static int dmz_get_sb(struct dmz_metadata *zmd, unsigned int set) | |
889 | { | |
890 | struct dmz_mblock *mblk; | |
891 | int ret; | |
892 | ||
893 | /* Allocate a block */ | |
894 | mblk = dmz_alloc_mblock(zmd, 0); | |
895 | if (!mblk) | |
896 | return -ENOMEM; | |
897 | ||
898 | zmd->sb[set].mblk = mblk; | |
899 | zmd->sb[set].sb = mblk->data; | |
900 | ||
901 | /* Read super block */ | |
902 | ret = dmz_read_sb(zmd, set); | |
903 | if (ret) { | |
904 | dmz_free_mblock(zmd, mblk); | |
905 | zmd->sb[set].mblk = NULL; | |
906 | return ret; | |
907 | } | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
912 | /* | |
913 | * Recover a metadata set. | |
914 | */ | |
915 | static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set) | |
916 | { | |
917 | unsigned int src_set = dst_set ^ 0x1; | |
918 | struct page *page; | |
919 | int i, ret; | |
920 | ||
921 | dmz_dev_warn(zmd->dev, "Metadata set %u invalid: recovering", dst_set); | |
922 | ||
923 | if (dst_set == 0) | |
924 | zmd->sb[0].block = dmz_start_block(zmd, zmd->sb_zone); | |
925 | else { | |
926 | zmd->sb[1].block = zmd->sb[0].block + | |
927 | (zmd->nr_meta_zones << zmd->dev->zone_nr_blocks_shift); | |
928 | } | |
929 | ||
4218a955 | 930 | page = alloc_page(GFP_NOIO); |
3b1a94c8 DLM |
931 | if (!page) |
932 | return -ENOMEM; | |
933 | ||
934 | /* Copy metadata blocks */ | |
935 | for (i = 1; i < zmd->nr_meta_blocks; i++) { | |
936 | ret = dmz_rdwr_block(zmd, REQ_OP_READ, | |
937 | zmd->sb[src_set].block + i, page); | |
938 | if (ret) | |
939 | goto out; | |
940 | ret = dmz_rdwr_block(zmd, REQ_OP_WRITE, | |
941 | zmd->sb[dst_set].block + i, page); | |
942 | if (ret) | |
943 | goto out; | |
944 | } | |
945 | ||
946 | /* Finalize with the super block */ | |
947 | if (!zmd->sb[dst_set].mblk) { | |
948 | zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0); | |
949 | if (!zmd->sb[dst_set].mblk) { | |
950 | ret = -ENOMEM; | |
951 | goto out; | |
952 | } | |
953 | zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data; | |
954 | } | |
955 | ||
956 | ret = dmz_write_sb(zmd, dst_set); | |
957 | out: | |
958 | __free_pages(page, 0); | |
959 | ||
960 | return ret; | |
961 | } | |
962 | ||
963 | /* | |
964 | * Get super block from disk. | |
965 | */ | |
966 | static int dmz_load_sb(struct dmz_metadata *zmd) | |
967 | { | |
968 | bool sb_good[2] = {false, false}; | |
969 | u64 sb_gen[2] = {0, 0}; | |
970 | int ret; | |
971 | ||
972 | /* Read and check the primary super block */ | |
973 | zmd->sb[0].block = dmz_start_block(zmd, zmd->sb_zone); | |
974 | ret = dmz_get_sb(zmd, 0); | |
975 | if (ret) { | |
976 | dmz_dev_err(zmd->dev, "Read primary super block failed"); | |
977 | return ret; | |
978 | } | |
979 | ||
980 | ret = dmz_check_sb(zmd, zmd->sb[0].sb); | |
981 | ||
982 | /* Read and check secondary super block */ | |
983 | if (ret == 0) { | |
984 | sb_good[0] = true; | |
985 | zmd->sb[1].block = zmd->sb[0].block + | |
986 | (zmd->nr_meta_zones << zmd->dev->zone_nr_blocks_shift); | |
987 | ret = dmz_get_sb(zmd, 1); | |
988 | } else | |
989 | ret = dmz_lookup_secondary_sb(zmd); | |
990 | ||
991 | if (ret) { | |
992 | dmz_dev_err(zmd->dev, "Read secondary super block failed"); | |
993 | return ret; | |
994 | } | |
995 | ||
996 | ret = dmz_check_sb(zmd, zmd->sb[1].sb); | |
997 | if (ret == 0) | |
998 | sb_good[1] = true; | |
999 | ||
1000 | /* Use highest generation sb first */ | |
1001 | if (!sb_good[0] && !sb_good[1]) { | |
1002 | dmz_dev_err(zmd->dev, "No valid super block found"); | |
1003 | return -EIO; | |
1004 | } | |
1005 | ||
1006 | if (sb_good[0]) | |
1007 | sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen); | |
1008 | else | |
1009 | ret = dmz_recover_mblocks(zmd, 0); | |
1010 | ||
1011 | if (sb_good[1]) | |
1012 | sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen); | |
1013 | else | |
1014 | ret = dmz_recover_mblocks(zmd, 1); | |
1015 | ||
1016 | if (ret) { | |
1017 | dmz_dev_err(zmd->dev, "Recovery failed"); | |
1018 | return -EIO; | |
1019 | } | |
1020 | ||
1021 | if (sb_gen[0] >= sb_gen[1]) { | |
1022 | zmd->sb_gen = sb_gen[0]; | |
1023 | zmd->mblk_primary = 0; | |
1024 | } else { | |
1025 | zmd->sb_gen = sb_gen[1]; | |
1026 | zmd->mblk_primary = 1; | |
1027 | } | |
1028 | ||
1029 | dmz_dev_debug(zmd->dev, "Using super block %u (gen %llu)", | |
1030 | zmd->mblk_primary, zmd->sb_gen); | |
1031 | ||
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * Initialize a zone descriptor. | |
1037 | */ | |
1038 | static int dmz_init_zone(struct dmz_metadata *zmd, struct dm_zone *zone, | |
1039 | struct blk_zone *blkz) | |
1040 | { | |
1041 | struct dmz_dev *dev = zmd->dev; | |
1042 | ||
1043 | /* Ignore the eventual last runt (smaller) zone */ | |
1044 | if (blkz->len != dev->zone_nr_sectors) { | |
1045 | if (blkz->start + blkz->len == dev->capacity) | |
1046 | return 0; | |
1047 | return -ENXIO; | |
1048 | } | |
1049 | ||
1050 | INIT_LIST_HEAD(&zone->link); | |
1051 | atomic_set(&zone->refcount, 0); | |
1052 | zone->chunk = DMZ_MAP_UNMAPPED; | |
1053 | ||
1054 | if (blkz->type == BLK_ZONE_TYPE_CONVENTIONAL) { | |
1055 | set_bit(DMZ_RND, &zone->flags); | |
1056 | zmd->nr_rnd_zones++; | |
1057 | } else if (blkz->type == BLK_ZONE_TYPE_SEQWRITE_REQ || | |
1058 | blkz->type == BLK_ZONE_TYPE_SEQWRITE_PREF) { | |
1059 | set_bit(DMZ_SEQ, &zone->flags); | |
1060 | } else | |
1061 | return -ENXIO; | |
1062 | ||
1063 | if (blkz->cond == BLK_ZONE_COND_OFFLINE) | |
1064 | set_bit(DMZ_OFFLINE, &zone->flags); | |
1065 | else if (blkz->cond == BLK_ZONE_COND_READONLY) | |
1066 | set_bit(DMZ_READ_ONLY, &zone->flags); | |
1067 | ||
1068 | if (dmz_is_rnd(zone)) | |
1069 | zone->wp_block = 0; | |
1070 | else | |
1071 | zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); | |
1072 | ||
1073 | if (!dmz_is_offline(zone) && !dmz_is_readonly(zone)) { | |
1074 | zmd->nr_useable_zones++; | |
1075 | if (dmz_is_rnd(zone)) { | |
1076 | zmd->nr_rnd_zones++; | |
1077 | if (!zmd->sb_zone) { | |
1078 | /* Super block zone */ | |
1079 | zmd->sb_zone = zone; | |
1080 | } | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * Free zones descriptors. | |
1089 | */ | |
1090 | static void dmz_drop_zones(struct dmz_metadata *zmd) | |
1091 | { | |
1092 | kfree(zmd->zones); | |
1093 | zmd->zones = NULL; | |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * The size of a zone report in number of zones. | |
1098 | * This results in 4096*64B=256KB report zones commands. | |
1099 | */ | |
1100 | #define DMZ_REPORT_NR_ZONES 4096 | |
1101 | ||
1102 | /* | |
1103 | * Allocate and initialize zone descriptors using the zone | |
1104 | * information from disk. | |
1105 | */ | |
1106 | static int dmz_init_zones(struct dmz_metadata *zmd) | |
1107 | { | |
1108 | struct dmz_dev *dev = zmd->dev; | |
1109 | struct dm_zone *zone; | |
1110 | struct blk_zone *blkz; | |
1111 | unsigned int nr_blkz; | |
1112 | sector_t sector = 0; | |
1113 | int i, ret = 0; | |
1114 | ||
1115 | /* Init */ | |
1116 | zmd->zone_bitmap_size = dev->zone_nr_blocks >> 3; | |
1117 | zmd->zone_nr_bitmap_blocks = zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT; | |
1118 | ||
1119 | /* Allocate zone array */ | |
1120 | zmd->zones = kcalloc(dev->nr_zones, sizeof(struct dm_zone), GFP_KERNEL); | |
1121 | if (!zmd->zones) | |
1122 | return -ENOMEM; | |
1123 | ||
1124 | dmz_dev_info(dev, "Using %zu B for zone information", | |
1125 | sizeof(struct dm_zone) * dev->nr_zones); | |
1126 | ||
1127 | /* Get zone information */ | |
1128 | nr_blkz = DMZ_REPORT_NR_ZONES; | |
1129 | blkz = kcalloc(nr_blkz, sizeof(struct blk_zone), GFP_KERNEL); | |
1130 | if (!blkz) { | |
1131 | ret = -ENOMEM; | |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * Get zone information and initialize zone descriptors. | |
1137 | * At the same time, determine where the super block | |
1138 | * should be: first block of the first randomly writable | |
1139 | * zone. | |
1140 | */ | |
1141 | zone = zmd->zones; | |
1142 | while (sector < dev->capacity) { | |
1143 | /* Get zone information */ | |
1144 | nr_blkz = DMZ_REPORT_NR_ZONES; | |
1145 | ret = blkdev_report_zones(dev->bdev, sector, blkz, | |
1146 | &nr_blkz, GFP_KERNEL); | |
1147 | if (ret) { | |
1148 | dmz_dev_err(dev, "Report zones failed %d", ret); | |
1149 | goto out; | |
1150 | } | |
1151 | ||
1152 | /* Process report */ | |
1153 | for (i = 0; i < nr_blkz; i++) { | |
1154 | ret = dmz_init_zone(zmd, zone, &blkz[i]); | |
1155 | if (ret) | |
1156 | goto out; | |
1157 | sector += dev->zone_nr_sectors; | |
1158 | zone++; | |
1159 | } | |
1160 | } | |
1161 | ||
1162 | /* The entire zone configuration of the disk should now be known */ | |
1163 | if (sector < dev->capacity) { | |
1164 | dmz_dev_err(dev, "Failed to get correct zone information"); | |
1165 | ret = -ENXIO; | |
1166 | } | |
1167 | out: | |
1168 | kfree(blkz); | |
1169 | if (ret) | |
1170 | dmz_drop_zones(zmd); | |
1171 | ||
1172 | return ret; | |
1173 | } | |
1174 | ||
1175 | /* | |
1176 | * Update a zone information. | |
1177 | */ | |
1178 | static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1179 | { | |
1180 | unsigned int nr_blkz = 1; | |
1181 | struct blk_zone blkz; | |
1182 | int ret; | |
1183 | ||
1184 | /* Get zone information from disk */ | |
1185 | ret = blkdev_report_zones(zmd->dev->bdev, dmz_start_sect(zmd, zone), | |
4218a955 | 1186 | &blkz, &nr_blkz, GFP_NOIO); |
3b1a94c8 DLM |
1187 | if (ret) { |
1188 | dmz_dev_err(zmd->dev, "Get zone %u report failed", | |
1189 | dmz_id(zmd, zone)); | |
1190 | return ret; | |
1191 | } | |
1192 | ||
1193 | clear_bit(DMZ_OFFLINE, &zone->flags); | |
1194 | clear_bit(DMZ_READ_ONLY, &zone->flags); | |
1195 | if (blkz.cond == BLK_ZONE_COND_OFFLINE) | |
1196 | set_bit(DMZ_OFFLINE, &zone->flags); | |
1197 | else if (blkz.cond == BLK_ZONE_COND_READONLY) | |
1198 | set_bit(DMZ_READ_ONLY, &zone->flags); | |
1199 | ||
1200 | if (dmz_is_seq(zone)) | |
1201 | zone->wp_block = dmz_sect2blk(blkz.wp - blkz.start); | |
1202 | else | |
1203 | zone->wp_block = 0; | |
1204 | ||
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * Check a zone write pointer position when the zone is marked | |
1210 | * with the sequential write error flag. | |
1211 | */ | |
1212 | static int dmz_handle_seq_write_err(struct dmz_metadata *zmd, | |
1213 | struct dm_zone *zone) | |
1214 | { | |
1215 | unsigned int wp = 0; | |
1216 | int ret; | |
1217 | ||
1218 | wp = zone->wp_block; | |
1219 | ret = dmz_update_zone(zmd, zone); | |
1220 | if (ret) | |
1221 | return ret; | |
1222 | ||
1223 | dmz_dev_warn(zmd->dev, "Processing zone %u write error (zone wp %u/%u)", | |
1224 | dmz_id(zmd, zone), zone->wp_block, wp); | |
1225 | ||
1226 | if (zone->wp_block < wp) { | |
1227 | dmz_invalidate_blocks(zmd, zone, zone->wp_block, | |
1228 | wp - zone->wp_block); | |
1229 | } | |
1230 | ||
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id) | |
1235 | { | |
1236 | return &zmd->zones[zone_id]; | |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * Reset a zone write pointer. | |
1241 | */ | |
1242 | static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1243 | { | |
1244 | int ret; | |
1245 | ||
1246 | /* | |
1247 | * Ignore offline zones, read only zones, | |
1248 | * and conventional zones. | |
1249 | */ | |
1250 | if (dmz_is_offline(zone) || | |
1251 | dmz_is_readonly(zone) || | |
1252 | dmz_is_rnd(zone)) | |
1253 | return 0; | |
1254 | ||
1255 | if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) { | |
1256 | struct dmz_dev *dev = zmd->dev; | |
1257 | ||
1258 | ret = blkdev_reset_zones(dev->bdev, | |
1259 | dmz_start_sect(zmd, zone), | |
4218a955 | 1260 | dev->zone_nr_sectors, GFP_NOIO); |
3b1a94c8 DLM |
1261 | if (ret) { |
1262 | dmz_dev_err(dev, "Reset zone %u failed %d", | |
1263 | dmz_id(zmd, zone), ret); | |
1264 | return ret; | |
1265 | } | |
1266 | } | |
1267 | ||
1268 | /* Clear write error bit and rewind write pointer position */ | |
1269 | clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags); | |
1270 | zone->wp_block = 0; | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone); | |
1276 | ||
1277 | /* | |
1278 | * Initialize chunk mapping. | |
1279 | */ | |
1280 | static int dmz_load_mapping(struct dmz_metadata *zmd) | |
1281 | { | |
1282 | struct dmz_dev *dev = zmd->dev; | |
1283 | struct dm_zone *dzone, *bzone; | |
1284 | struct dmz_mblock *dmap_mblk = NULL; | |
1285 | struct dmz_map *dmap; | |
1286 | unsigned int i = 0, e = 0, chunk = 0; | |
1287 | unsigned int dzone_id; | |
1288 | unsigned int bzone_id; | |
1289 | ||
1290 | /* Metadata block array for the chunk mapping table */ | |
1291 | zmd->map_mblk = kcalloc(zmd->nr_map_blocks, | |
1292 | sizeof(struct dmz_mblk *), GFP_KERNEL); | |
1293 | if (!zmd->map_mblk) | |
1294 | return -ENOMEM; | |
1295 | ||
1296 | /* Get chunk mapping table blocks and initialize zone mapping */ | |
1297 | while (chunk < zmd->nr_chunks) { | |
1298 | if (!dmap_mblk) { | |
1299 | /* Get mapping block */ | |
1300 | dmap_mblk = dmz_get_mblock(zmd, i + 1); | |
1301 | if (IS_ERR(dmap_mblk)) | |
1302 | return PTR_ERR(dmap_mblk); | |
1303 | zmd->map_mblk[i] = dmap_mblk; | |
1304 | dmap = (struct dmz_map *) dmap_mblk->data; | |
1305 | i++; | |
1306 | e = 0; | |
1307 | } | |
1308 | ||
1309 | /* Check data zone */ | |
1310 | dzone_id = le32_to_cpu(dmap[e].dzone_id); | |
1311 | if (dzone_id == DMZ_MAP_UNMAPPED) | |
1312 | goto next; | |
1313 | ||
1314 | if (dzone_id >= dev->nr_zones) { | |
1315 | dmz_dev_err(dev, "Chunk %u mapping: invalid data zone ID %u", | |
1316 | chunk, dzone_id); | |
1317 | return -EIO; | |
1318 | } | |
1319 | ||
1320 | dzone = dmz_get(zmd, dzone_id); | |
1321 | set_bit(DMZ_DATA, &dzone->flags); | |
1322 | dzone->chunk = chunk; | |
1323 | dmz_get_zone_weight(zmd, dzone); | |
1324 | ||
1325 | if (dmz_is_rnd(dzone)) | |
1326 | list_add_tail(&dzone->link, &zmd->map_rnd_list); | |
1327 | else | |
1328 | list_add_tail(&dzone->link, &zmd->map_seq_list); | |
1329 | ||
1330 | /* Check buffer zone */ | |
1331 | bzone_id = le32_to_cpu(dmap[e].bzone_id); | |
1332 | if (bzone_id == DMZ_MAP_UNMAPPED) | |
1333 | goto next; | |
1334 | ||
1335 | if (bzone_id >= dev->nr_zones) { | |
1336 | dmz_dev_err(dev, "Chunk %u mapping: invalid buffer zone ID %u", | |
1337 | chunk, bzone_id); | |
1338 | return -EIO; | |
1339 | } | |
1340 | ||
1341 | bzone = dmz_get(zmd, bzone_id); | |
1342 | if (!dmz_is_rnd(bzone)) { | |
1343 | dmz_dev_err(dev, "Chunk %u mapping: invalid buffer zone %u", | |
1344 | chunk, bzone_id); | |
1345 | return -EIO; | |
1346 | } | |
1347 | ||
1348 | set_bit(DMZ_DATA, &bzone->flags); | |
1349 | set_bit(DMZ_BUF, &bzone->flags); | |
1350 | bzone->chunk = chunk; | |
1351 | bzone->bzone = dzone; | |
1352 | dzone->bzone = bzone; | |
1353 | dmz_get_zone_weight(zmd, bzone); | |
1354 | list_add_tail(&bzone->link, &zmd->map_rnd_list); | |
1355 | next: | |
1356 | chunk++; | |
1357 | e++; | |
1358 | if (e >= DMZ_MAP_ENTRIES) | |
1359 | dmap_mblk = NULL; | |
1360 | } | |
1361 | ||
1362 | /* | |
1363 | * At this point, only meta zones and mapped data zones were | |
1364 | * fully initialized. All remaining zones are unmapped data | |
1365 | * zones. Finish initializing those here. | |
1366 | */ | |
1367 | for (i = 0; i < dev->nr_zones; i++) { | |
1368 | dzone = dmz_get(zmd, i); | |
1369 | if (dmz_is_meta(dzone)) | |
1370 | continue; | |
1371 | ||
1372 | if (dmz_is_rnd(dzone)) | |
1373 | zmd->nr_rnd++; | |
1374 | else | |
1375 | zmd->nr_seq++; | |
1376 | ||
1377 | if (dmz_is_data(dzone)) { | |
1378 | /* Already initialized */ | |
1379 | continue; | |
1380 | } | |
1381 | ||
1382 | /* Unmapped data zone */ | |
1383 | set_bit(DMZ_DATA, &dzone->flags); | |
1384 | dzone->chunk = DMZ_MAP_UNMAPPED; | |
1385 | if (dmz_is_rnd(dzone)) { | |
1386 | list_add_tail(&dzone->link, &zmd->unmap_rnd_list); | |
1387 | atomic_inc(&zmd->unmap_nr_rnd); | |
1388 | } else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) { | |
1389 | list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list); | |
1390 | atomic_inc(&zmd->nr_reserved_seq_zones); | |
1391 | zmd->nr_seq--; | |
1392 | } else { | |
1393 | list_add_tail(&dzone->link, &zmd->unmap_seq_list); | |
1394 | atomic_inc(&zmd->unmap_nr_seq); | |
1395 | } | |
1396 | } | |
1397 | ||
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * Set a data chunk mapping. | |
1403 | */ | |
1404 | static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, | |
1405 | unsigned int dzone_id, unsigned int bzone_id) | |
1406 | { | |
1407 | struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; | |
1408 | struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; | |
1409 | int map_idx = chunk & DMZ_MAP_ENTRIES_MASK; | |
1410 | ||
1411 | dmap[map_idx].dzone_id = cpu_to_le32(dzone_id); | |
1412 | dmap[map_idx].bzone_id = cpu_to_le32(bzone_id); | |
1413 | dmz_dirty_mblock(zmd, dmap_mblk); | |
1414 | } | |
1415 | ||
1416 | /* | |
1417 | * The list of mapped zones is maintained in LRU order. | |
1418 | * This rotates a zone at the end of its map list. | |
1419 | */ | |
1420 | static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1421 | { | |
1422 | if (list_empty(&zone->link)) | |
1423 | return; | |
1424 | ||
1425 | list_del_init(&zone->link); | |
1426 | if (dmz_is_seq(zone)) { | |
1427 | /* LRU rotate sequential zone */ | |
1428 | list_add_tail(&zone->link, &zmd->map_seq_list); | |
1429 | } else { | |
1430 | /* LRU rotate random zone */ | |
1431 | list_add_tail(&zone->link, &zmd->map_rnd_list); | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | /* | |
1436 | * The list of mapped random zones is maintained | |
1437 | * in LRU order. This rotates a zone at the end of the list. | |
1438 | */ | |
1439 | static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1440 | { | |
1441 | __dmz_lru_zone(zmd, zone); | |
1442 | if (zone->bzone) | |
1443 | __dmz_lru_zone(zmd, zone->bzone); | |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * Wait for any zone to be freed. | |
1448 | */ | |
1449 | static void dmz_wait_for_free_zones(struct dmz_metadata *zmd) | |
1450 | { | |
1451 | DEFINE_WAIT(wait); | |
1452 | ||
1453 | prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE); | |
1454 | dmz_unlock_map(zmd); | |
1455 | dmz_unlock_metadata(zmd); | |
1456 | ||
1457 | io_schedule_timeout(HZ); | |
1458 | ||
1459 | dmz_lock_metadata(zmd); | |
1460 | dmz_lock_map(zmd); | |
1461 | finish_wait(&zmd->free_wq, &wait); | |
1462 | } | |
1463 | ||
1464 | /* | |
1465 | * Lock a zone for reclaim (set the zone RECLAIM bit). | |
1466 | * Returns false if the zone cannot be locked or if it is already locked | |
1467 | * and 1 otherwise. | |
1468 | */ | |
1469 | int dmz_lock_zone_reclaim(struct dm_zone *zone) | |
1470 | { | |
1471 | /* Active zones cannot be reclaimed */ | |
1472 | if (dmz_is_active(zone)) | |
1473 | return 0; | |
1474 | ||
1475 | return !test_and_set_bit(DMZ_RECLAIM, &zone->flags); | |
1476 | } | |
1477 | ||
1478 | /* | |
1479 | * Clear a zone reclaim flag. | |
1480 | */ | |
1481 | void dmz_unlock_zone_reclaim(struct dm_zone *zone) | |
1482 | { | |
1483 | WARN_ON(dmz_is_active(zone)); | |
1484 | WARN_ON(!dmz_in_reclaim(zone)); | |
1485 | ||
1486 | clear_bit_unlock(DMZ_RECLAIM, &zone->flags); | |
1487 | smp_mb__after_atomic(); | |
1488 | wake_up_bit(&zone->flags, DMZ_RECLAIM); | |
1489 | } | |
1490 | ||
1491 | /* | |
1492 | * Wait for a zone reclaim to complete. | |
1493 | */ | |
1494 | static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1495 | { | |
1496 | dmz_unlock_map(zmd); | |
1497 | dmz_unlock_metadata(zmd); | |
1498 | wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ); | |
1499 | dmz_lock_metadata(zmd); | |
1500 | dmz_lock_map(zmd); | |
1501 | } | |
1502 | ||
1503 | /* | |
1504 | * Select a random write zone for reclaim. | |
1505 | */ | |
1506 | static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd) | |
1507 | { | |
1508 | struct dm_zone *dzone = NULL; | |
1509 | struct dm_zone *zone; | |
1510 | ||
1511 | if (list_empty(&zmd->map_rnd_list)) | |
1512 | return NULL; | |
1513 | ||
1514 | list_for_each_entry(zone, &zmd->map_rnd_list, link) { | |
1515 | if (dmz_is_buf(zone)) | |
1516 | dzone = zone->bzone; | |
1517 | else | |
1518 | dzone = zone; | |
1519 | if (dmz_lock_zone_reclaim(dzone)) | |
1520 | return dzone; | |
1521 | } | |
1522 | ||
1523 | return NULL; | |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * Select a buffered sequential zone for reclaim. | |
1528 | */ | |
1529 | static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd) | |
1530 | { | |
1531 | struct dm_zone *zone; | |
1532 | ||
1533 | if (list_empty(&zmd->map_seq_list)) | |
1534 | return NULL; | |
1535 | ||
1536 | list_for_each_entry(zone, &zmd->map_seq_list, link) { | |
1537 | if (!zone->bzone) | |
1538 | continue; | |
1539 | if (dmz_lock_zone_reclaim(zone)) | |
1540 | return zone; | |
1541 | } | |
1542 | ||
1543 | return NULL; | |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * Select a zone for reclaim. | |
1548 | */ | |
1549 | struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd) | |
1550 | { | |
1551 | struct dm_zone *zone; | |
1552 | ||
1553 | /* | |
1554 | * Search for a zone candidate to reclaim: 2 cases are possible. | |
1555 | * (1) There is no free sequential zones. Then a random data zone | |
1556 | * cannot be reclaimed. So choose a sequential zone to reclaim so | |
1557 | * that afterward a random zone can be reclaimed. | |
1558 | * (2) At least one free sequential zone is available, then choose | |
1559 | * the oldest random zone (data or buffer) that can be locked. | |
1560 | */ | |
1561 | dmz_lock_map(zmd); | |
1562 | if (list_empty(&zmd->reserved_seq_zones_list)) | |
1563 | zone = dmz_get_seq_zone_for_reclaim(zmd); | |
1564 | else | |
1565 | zone = dmz_get_rnd_zone_for_reclaim(zmd); | |
1566 | dmz_unlock_map(zmd); | |
1567 | ||
1568 | return zone; | |
1569 | } | |
1570 | ||
1571 | /* | |
1572 | * Activate a zone (increment its reference count). | |
1573 | */ | |
1574 | void dmz_activate_zone(struct dm_zone *zone) | |
1575 | { | |
1576 | set_bit(DMZ_ACTIVE, &zone->flags); | |
1577 | atomic_inc(&zone->refcount); | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * Deactivate a zone. This decrement the zone reference counter | |
1582 | * and clears the active state of the zone once the count reaches 0, | |
1583 | * indicating that all BIOs to the zone have completed. Returns | |
1584 | * true if the zone was deactivated. | |
1585 | */ | |
1586 | void dmz_deactivate_zone(struct dm_zone *zone) | |
1587 | { | |
1588 | if (atomic_dec_and_test(&zone->refcount)) { | |
1589 | WARN_ON(!test_bit(DMZ_ACTIVE, &zone->flags)); | |
1590 | clear_bit_unlock(DMZ_ACTIVE, &zone->flags); | |
1591 | smp_mb__after_atomic(); | |
1592 | } | |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * Get the zone mapping a chunk, if the chunk is mapped already. | |
1597 | * If no mapping exist and the operation is WRITE, a zone is | |
1598 | * allocated and used to map the chunk. | |
1599 | * The zone returned will be set to the active state. | |
1600 | */ | |
1601 | struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op) | |
1602 | { | |
1603 | struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; | |
1604 | struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; | |
1605 | int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK; | |
1606 | unsigned int dzone_id; | |
1607 | struct dm_zone *dzone = NULL; | |
1608 | int ret = 0; | |
1609 | ||
1610 | dmz_lock_map(zmd); | |
1611 | again: | |
1612 | /* Get the chunk mapping */ | |
1613 | dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id); | |
1614 | if (dzone_id == DMZ_MAP_UNMAPPED) { | |
1615 | /* | |
1616 | * Read or discard in unmapped chunks are fine. But for | |
1617 | * writes, we need a mapping, so get one. | |
1618 | */ | |
1619 | if (op != REQ_OP_WRITE) | |
1620 | goto out; | |
1621 | ||
1622 | /* Alloate a random zone */ | |
1623 | dzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND); | |
1624 | if (!dzone) { | |
1625 | dmz_wait_for_free_zones(zmd); | |
1626 | goto again; | |
1627 | } | |
1628 | ||
1629 | dmz_map_zone(zmd, dzone, chunk); | |
1630 | ||
1631 | } else { | |
1632 | /* The chunk is already mapped: get the mapping zone */ | |
1633 | dzone = dmz_get(zmd, dzone_id); | |
1634 | if (dzone->chunk != chunk) { | |
1635 | dzone = ERR_PTR(-EIO); | |
1636 | goto out; | |
1637 | } | |
1638 | ||
1639 | /* Repair write pointer if the sequential dzone has error */ | |
1640 | if (dmz_seq_write_err(dzone)) { | |
1641 | ret = dmz_handle_seq_write_err(zmd, dzone); | |
1642 | if (ret) { | |
1643 | dzone = ERR_PTR(-EIO); | |
1644 | goto out; | |
1645 | } | |
1646 | clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags); | |
1647 | } | |
1648 | } | |
1649 | ||
1650 | /* | |
1651 | * If the zone is being reclaimed, the chunk mapping may change | |
1652 | * to a different zone. So wait for reclaim and retry. Otherwise, | |
1653 | * activate the zone (this will prevent reclaim from touching it). | |
1654 | */ | |
1655 | if (dmz_in_reclaim(dzone)) { | |
1656 | dmz_wait_for_reclaim(zmd, dzone); | |
1657 | goto again; | |
1658 | } | |
1659 | dmz_activate_zone(dzone); | |
1660 | dmz_lru_zone(zmd, dzone); | |
1661 | out: | |
1662 | dmz_unlock_map(zmd); | |
1663 | ||
1664 | return dzone; | |
1665 | } | |
1666 | ||
1667 | /* | |
1668 | * Write and discard change the block validity of data zones and their buffer | |
1669 | * zones. Check here that valid blocks are still present. If all blocks are | |
1670 | * invalid, the zones can be unmapped on the fly without waiting for reclaim | |
1671 | * to do it. | |
1672 | */ | |
1673 | void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone) | |
1674 | { | |
1675 | struct dm_zone *bzone; | |
1676 | ||
1677 | dmz_lock_map(zmd); | |
1678 | ||
1679 | bzone = dzone->bzone; | |
1680 | if (bzone) { | |
1681 | if (dmz_weight(bzone)) | |
1682 | dmz_lru_zone(zmd, bzone); | |
1683 | else { | |
1684 | /* Empty buffer zone: reclaim it */ | |
1685 | dmz_unmap_zone(zmd, bzone); | |
1686 | dmz_free_zone(zmd, bzone); | |
1687 | bzone = NULL; | |
1688 | } | |
1689 | } | |
1690 | ||
1691 | /* Deactivate the data zone */ | |
1692 | dmz_deactivate_zone(dzone); | |
1693 | if (dmz_is_active(dzone) || bzone || dmz_weight(dzone)) | |
1694 | dmz_lru_zone(zmd, dzone); | |
1695 | else { | |
1696 | /* Unbuffered inactive empty data zone: reclaim it */ | |
1697 | dmz_unmap_zone(zmd, dzone); | |
1698 | dmz_free_zone(zmd, dzone); | |
1699 | } | |
1700 | ||
1701 | dmz_unlock_map(zmd); | |
1702 | } | |
1703 | ||
1704 | /* | |
1705 | * Allocate and map a random zone to buffer a chunk | |
1706 | * already mapped to a sequential zone. | |
1707 | */ | |
1708 | struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd, | |
1709 | struct dm_zone *dzone) | |
1710 | { | |
1711 | struct dm_zone *bzone; | |
1712 | ||
1713 | dmz_lock_map(zmd); | |
1714 | again: | |
1715 | bzone = dzone->bzone; | |
1716 | if (bzone) | |
1717 | goto out; | |
1718 | ||
1719 | /* Alloate a random zone */ | |
1720 | bzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND); | |
1721 | if (!bzone) { | |
1722 | dmz_wait_for_free_zones(zmd); | |
1723 | goto again; | |
1724 | } | |
1725 | ||
1726 | /* Update the chunk mapping */ | |
1727 | dmz_set_chunk_mapping(zmd, dzone->chunk, dmz_id(zmd, dzone), | |
1728 | dmz_id(zmd, bzone)); | |
1729 | ||
1730 | set_bit(DMZ_BUF, &bzone->flags); | |
1731 | bzone->chunk = dzone->chunk; | |
1732 | bzone->bzone = dzone; | |
1733 | dzone->bzone = bzone; | |
1734 | list_add_tail(&bzone->link, &zmd->map_rnd_list); | |
1735 | out: | |
1736 | dmz_unlock_map(zmd); | |
1737 | ||
1738 | return bzone; | |
1739 | } | |
1740 | ||
1741 | /* | |
1742 | * Get an unmapped (free) zone. | |
1743 | * This must be called with the mapping lock held. | |
1744 | */ | |
1745 | struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags) | |
1746 | { | |
1747 | struct list_head *list; | |
1748 | struct dm_zone *zone; | |
1749 | ||
1750 | if (flags & DMZ_ALLOC_RND) | |
1751 | list = &zmd->unmap_rnd_list; | |
1752 | else | |
1753 | list = &zmd->unmap_seq_list; | |
1754 | again: | |
1755 | if (list_empty(list)) { | |
1756 | /* | |
1757 | * No free zone: if this is for reclaim, allow using the | |
1758 | * reserved sequential zones. | |
1759 | */ | |
1760 | if (!(flags & DMZ_ALLOC_RECLAIM) || | |
1761 | list_empty(&zmd->reserved_seq_zones_list)) | |
1762 | return NULL; | |
1763 | ||
1764 | zone = list_first_entry(&zmd->reserved_seq_zones_list, | |
1765 | struct dm_zone, link); | |
1766 | list_del_init(&zone->link); | |
1767 | atomic_dec(&zmd->nr_reserved_seq_zones); | |
1768 | return zone; | |
1769 | } | |
1770 | ||
1771 | zone = list_first_entry(list, struct dm_zone, link); | |
1772 | list_del_init(&zone->link); | |
1773 | ||
1774 | if (dmz_is_rnd(zone)) | |
1775 | atomic_dec(&zmd->unmap_nr_rnd); | |
1776 | else | |
1777 | atomic_dec(&zmd->unmap_nr_seq); | |
1778 | ||
1779 | if (dmz_is_offline(zone)) { | |
1780 | dmz_dev_warn(zmd->dev, "Zone %u is offline", dmz_id(zmd, zone)); | |
1781 | zone = NULL; | |
1782 | goto again; | |
1783 | } | |
1784 | ||
1785 | return zone; | |
1786 | } | |
1787 | ||
1788 | /* | |
1789 | * Free a zone. | |
1790 | * This must be called with the mapping lock held. | |
1791 | */ | |
1792 | void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1793 | { | |
1794 | /* If this is a sequential zone, reset it */ | |
1795 | if (dmz_is_seq(zone)) | |
1796 | dmz_reset_zone(zmd, zone); | |
1797 | ||
1798 | /* Return the zone to its type unmap list */ | |
1799 | if (dmz_is_rnd(zone)) { | |
1800 | list_add_tail(&zone->link, &zmd->unmap_rnd_list); | |
1801 | atomic_inc(&zmd->unmap_nr_rnd); | |
1802 | } else if (atomic_read(&zmd->nr_reserved_seq_zones) < | |
1803 | zmd->nr_reserved_seq) { | |
1804 | list_add_tail(&zone->link, &zmd->reserved_seq_zones_list); | |
1805 | atomic_inc(&zmd->nr_reserved_seq_zones); | |
1806 | } else { | |
1807 | list_add_tail(&zone->link, &zmd->unmap_seq_list); | |
1808 | atomic_inc(&zmd->unmap_nr_seq); | |
1809 | } | |
1810 | ||
1811 | wake_up_all(&zmd->free_wq); | |
1812 | } | |
1813 | ||
1814 | /* | |
1815 | * Map a chunk to a zone. | |
1816 | * This must be called with the mapping lock held. | |
1817 | */ | |
1818 | void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone, | |
1819 | unsigned int chunk) | |
1820 | { | |
1821 | /* Set the chunk mapping */ | |
1822 | dmz_set_chunk_mapping(zmd, chunk, dmz_id(zmd, dzone), | |
1823 | DMZ_MAP_UNMAPPED); | |
1824 | dzone->chunk = chunk; | |
1825 | if (dmz_is_rnd(dzone)) | |
1826 | list_add_tail(&dzone->link, &zmd->map_rnd_list); | |
1827 | else | |
1828 | list_add_tail(&dzone->link, &zmd->map_seq_list); | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Unmap a zone. | |
1833 | * This must be called with the mapping lock held. | |
1834 | */ | |
1835 | void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1836 | { | |
1837 | unsigned int chunk = zone->chunk; | |
1838 | unsigned int dzone_id; | |
1839 | ||
1840 | if (chunk == DMZ_MAP_UNMAPPED) { | |
1841 | /* Already unmapped */ | |
1842 | return; | |
1843 | } | |
1844 | ||
1845 | if (test_and_clear_bit(DMZ_BUF, &zone->flags)) { | |
1846 | /* | |
1847 | * Unmapping the chunk buffer zone: clear only | |
1848 | * the chunk buffer mapping | |
1849 | */ | |
1850 | dzone_id = dmz_id(zmd, zone->bzone); | |
1851 | zone->bzone->bzone = NULL; | |
1852 | zone->bzone = NULL; | |
1853 | ||
1854 | } else { | |
1855 | /* | |
1856 | * Unmapping the chunk data zone: the zone must | |
1857 | * not be buffered. | |
1858 | */ | |
1859 | if (WARN_ON(zone->bzone)) { | |
1860 | zone->bzone->bzone = NULL; | |
1861 | zone->bzone = NULL; | |
1862 | } | |
1863 | dzone_id = DMZ_MAP_UNMAPPED; | |
1864 | } | |
1865 | ||
1866 | dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED); | |
1867 | ||
1868 | zone->chunk = DMZ_MAP_UNMAPPED; | |
1869 | list_del_init(&zone->link); | |
1870 | } | |
1871 | ||
1872 | /* | |
1873 | * Set @nr_bits bits in @bitmap starting from @bit. | |
1874 | * Return the number of bits changed from 0 to 1. | |
1875 | */ | |
1876 | static unsigned int dmz_set_bits(unsigned long *bitmap, | |
1877 | unsigned int bit, unsigned int nr_bits) | |
1878 | { | |
1879 | unsigned long *addr; | |
1880 | unsigned int end = bit + nr_bits; | |
1881 | unsigned int n = 0; | |
1882 | ||
1883 | while (bit < end) { | |
1884 | if (((bit & (BITS_PER_LONG - 1)) == 0) && | |
1885 | ((end - bit) >= BITS_PER_LONG)) { | |
1886 | /* Try to set the whole word at once */ | |
1887 | addr = bitmap + BIT_WORD(bit); | |
1888 | if (*addr == 0) { | |
1889 | *addr = ULONG_MAX; | |
1890 | n += BITS_PER_LONG; | |
1891 | bit += BITS_PER_LONG; | |
1892 | continue; | |
1893 | } | |
1894 | } | |
1895 | ||
1896 | if (!test_and_set_bit(bit, bitmap)) | |
1897 | n++; | |
1898 | bit++; | |
1899 | } | |
1900 | ||
1901 | return n; | |
1902 | } | |
1903 | ||
1904 | /* | |
1905 | * Get the bitmap block storing the bit for chunk_block in zone. | |
1906 | */ | |
1907 | static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd, | |
1908 | struct dm_zone *zone, | |
1909 | sector_t chunk_block) | |
1910 | { | |
1911 | sector_t bitmap_block = 1 + zmd->nr_map_blocks + | |
1912 | (sector_t)(dmz_id(zmd, zone) * zmd->zone_nr_bitmap_blocks) + | |
1913 | (chunk_block >> DMZ_BLOCK_SHIFT_BITS); | |
1914 | ||
1915 | return dmz_get_mblock(zmd, bitmap_block); | |
1916 | } | |
1917 | ||
1918 | /* | |
1919 | * Copy the valid blocks bitmap of from_zone to the bitmap of to_zone. | |
1920 | */ | |
1921 | int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, | |
1922 | struct dm_zone *to_zone) | |
1923 | { | |
1924 | struct dmz_mblock *from_mblk, *to_mblk; | |
1925 | sector_t chunk_block = 0; | |
1926 | ||
1927 | /* Get the zones bitmap blocks */ | |
1928 | while (chunk_block < zmd->dev->zone_nr_blocks) { | |
1929 | from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block); | |
1930 | if (IS_ERR(from_mblk)) | |
1931 | return PTR_ERR(from_mblk); | |
1932 | to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block); | |
1933 | if (IS_ERR(to_mblk)) { | |
1934 | dmz_release_mblock(zmd, from_mblk); | |
1935 | return PTR_ERR(to_mblk); | |
1936 | } | |
1937 | ||
1938 | memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE); | |
1939 | dmz_dirty_mblock(zmd, to_mblk); | |
1940 | ||
1941 | dmz_release_mblock(zmd, to_mblk); | |
1942 | dmz_release_mblock(zmd, from_mblk); | |
1943 | ||
1944 | chunk_block += DMZ_BLOCK_SIZE_BITS; | |
1945 | } | |
1946 | ||
1947 | to_zone->weight = from_zone->weight; | |
1948 | ||
1949 | return 0; | |
1950 | } | |
1951 | ||
1952 | /* | |
1953 | * Merge the valid blocks bitmap of from_zone into the bitmap of to_zone, | |
1954 | * starting from chunk_block. | |
1955 | */ | |
1956 | int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, | |
1957 | struct dm_zone *to_zone, sector_t chunk_block) | |
1958 | { | |
1959 | unsigned int nr_blocks; | |
1960 | int ret; | |
1961 | ||
1962 | /* Get the zones bitmap blocks */ | |
1963 | while (chunk_block < zmd->dev->zone_nr_blocks) { | |
1964 | /* Get a valid region from the source zone */ | |
1965 | ret = dmz_first_valid_block(zmd, from_zone, &chunk_block); | |
1966 | if (ret <= 0) | |
1967 | return ret; | |
1968 | ||
1969 | nr_blocks = ret; | |
1970 | ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks); | |
1971 | if (ret) | |
1972 | return ret; | |
1973 | ||
1974 | chunk_block += nr_blocks; | |
1975 | } | |
1976 | ||
1977 | return 0; | |
1978 | } | |
1979 | ||
1980 | /* | |
1981 | * Validate all the blocks in the range [block..block+nr_blocks-1]. | |
1982 | */ | |
1983 | int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, | |
1984 | sector_t chunk_block, unsigned int nr_blocks) | |
1985 | { | |
1986 | unsigned int count, bit, nr_bits; | |
1987 | unsigned int zone_nr_blocks = zmd->dev->zone_nr_blocks; | |
1988 | struct dmz_mblock *mblk; | |
1989 | unsigned int n = 0; | |
1990 | ||
1991 | dmz_dev_debug(zmd->dev, "=> VALIDATE zone %u, block %llu, %u blocks", | |
1992 | dmz_id(zmd, zone), (unsigned long long)chunk_block, | |
1993 | nr_blocks); | |
1994 | ||
1995 | WARN_ON(chunk_block + nr_blocks > zone_nr_blocks); | |
1996 | ||
1997 | while (nr_blocks) { | |
1998 | /* Get bitmap block */ | |
1999 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2000 | if (IS_ERR(mblk)) | |
2001 | return PTR_ERR(mblk); | |
2002 | ||
2003 | /* Set bits */ | |
2004 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
2005 | nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); | |
2006 | ||
2007 | count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits); | |
2008 | if (count) { | |
2009 | dmz_dirty_mblock(zmd, mblk); | |
2010 | n += count; | |
2011 | } | |
2012 | dmz_release_mblock(zmd, mblk); | |
2013 | ||
2014 | nr_blocks -= nr_bits; | |
2015 | chunk_block += nr_bits; | |
2016 | } | |
2017 | ||
2018 | if (likely(zone->weight + n <= zone_nr_blocks)) | |
2019 | zone->weight += n; | |
2020 | else { | |
2021 | dmz_dev_warn(zmd->dev, "Zone %u: weight %u should be <= %u", | |
2022 | dmz_id(zmd, zone), zone->weight, | |
2023 | zone_nr_blocks - n); | |
2024 | zone->weight = zone_nr_blocks; | |
2025 | } | |
2026 | ||
2027 | return 0; | |
2028 | } | |
2029 | ||
2030 | /* | |
2031 | * Clear nr_bits bits in bitmap starting from bit. | |
2032 | * Return the number of bits cleared. | |
2033 | */ | |
2034 | static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits) | |
2035 | { | |
2036 | unsigned long *addr; | |
2037 | int end = bit + nr_bits; | |
2038 | int n = 0; | |
2039 | ||
2040 | while (bit < end) { | |
2041 | if (((bit & (BITS_PER_LONG - 1)) == 0) && | |
2042 | ((end - bit) >= BITS_PER_LONG)) { | |
2043 | /* Try to clear whole word at once */ | |
2044 | addr = bitmap + BIT_WORD(bit); | |
2045 | if (*addr == ULONG_MAX) { | |
2046 | *addr = 0; | |
2047 | n += BITS_PER_LONG; | |
2048 | bit += BITS_PER_LONG; | |
2049 | continue; | |
2050 | } | |
2051 | } | |
2052 | ||
2053 | if (test_and_clear_bit(bit, bitmap)) | |
2054 | n++; | |
2055 | bit++; | |
2056 | } | |
2057 | ||
2058 | return n; | |
2059 | } | |
2060 | ||
2061 | /* | |
2062 | * Invalidate all the blocks in the range [block..block+nr_blocks-1]. | |
2063 | */ | |
2064 | int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2065 | sector_t chunk_block, unsigned int nr_blocks) | |
2066 | { | |
2067 | unsigned int count, bit, nr_bits; | |
2068 | struct dmz_mblock *mblk; | |
2069 | unsigned int n = 0; | |
2070 | ||
2071 | dmz_dev_debug(zmd->dev, "=> INVALIDATE zone %u, block %llu, %u blocks", | |
2072 | dmz_id(zmd, zone), (u64)chunk_block, nr_blocks); | |
2073 | ||
2074 | WARN_ON(chunk_block + nr_blocks > zmd->dev->zone_nr_blocks); | |
2075 | ||
2076 | while (nr_blocks) { | |
2077 | /* Get bitmap block */ | |
2078 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2079 | if (IS_ERR(mblk)) | |
2080 | return PTR_ERR(mblk); | |
2081 | ||
2082 | /* Clear bits */ | |
2083 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
2084 | nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); | |
2085 | ||
2086 | count = dmz_clear_bits((unsigned long *)mblk->data, | |
2087 | bit, nr_bits); | |
2088 | if (count) { | |
2089 | dmz_dirty_mblock(zmd, mblk); | |
2090 | n += count; | |
2091 | } | |
2092 | dmz_release_mblock(zmd, mblk); | |
2093 | ||
2094 | nr_blocks -= nr_bits; | |
2095 | chunk_block += nr_bits; | |
2096 | } | |
2097 | ||
2098 | if (zone->weight >= n) | |
2099 | zone->weight -= n; | |
2100 | else { | |
2101 | dmz_dev_warn(zmd->dev, "Zone %u: weight %u should be >= %u", | |
2102 | dmz_id(zmd, zone), zone->weight, n); | |
2103 | zone->weight = 0; | |
2104 | } | |
2105 | ||
2106 | return 0; | |
2107 | } | |
2108 | ||
2109 | /* | |
2110 | * Get a block bit value. | |
2111 | */ | |
2112 | static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2113 | sector_t chunk_block) | |
2114 | { | |
2115 | struct dmz_mblock *mblk; | |
2116 | int ret; | |
2117 | ||
2118 | WARN_ON(chunk_block >= zmd->dev->zone_nr_blocks); | |
2119 | ||
2120 | /* Get bitmap block */ | |
2121 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2122 | if (IS_ERR(mblk)) | |
2123 | return PTR_ERR(mblk); | |
2124 | ||
2125 | /* Get offset */ | |
2126 | ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS, | |
2127 | (unsigned long *) mblk->data) != 0; | |
2128 | ||
2129 | dmz_release_mblock(zmd, mblk); | |
2130 | ||
2131 | return ret; | |
2132 | } | |
2133 | ||
2134 | /* | |
2135 | * Return the number of blocks from chunk_block to the first block with a bit | |
2136 | * value specified by set. Search at most nr_blocks blocks from chunk_block. | |
2137 | */ | |
2138 | static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2139 | sector_t chunk_block, unsigned int nr_blocks, | |
2140 | int set) | |
2141 | { | |
2142 | struct dmz_mblock *mblk; | |
2143 | unsigned int bit, set_bit, nr_bits; | |
2144 | unsigned long *bitmap; | |
2145 | int n = 0; | |
2146 | ||
2147 | WARN_ON(chunk_block + nr_blocks > zmd->dev->zone_nr_blocks); | |
2148 | ||
2149 | while (nr_blocks) { | |
2150 | /* Get bitmap block */ | |
2151 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2152 | if (IS_ERR(mblk)) | |
2153 | return PTR_ERR(mblk); | |
2154 | ||
2155 | /* Get offset */ | |
2156 | bitmap = (unsigned long *) mblk->data; | |
2157 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
2158 | nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); | |
2159 | if (set) | |
2160 | set_bit = find_next_bit(bitmap, DMZ_BLOCK_SIZE_BITS, bit); | |
2161 | else | |
2162 | set_bit = find_next_zero_bit(bitmap, DMZ_BLOCK_SIZE_BITS, bit); | |
2163 | dmz_release_mblock(zmd, mblk); | |
2164 | ||
2165 | n += set_bit - bit; | |
2166 | if (set_bit < DMZ_BLOCK_SIZE_BITS) | |
2167 | break; | |
2168 | ||
2169 | nr_blocks -= nr_bits; | |
2170 | chunk_block += nr_bits; | |
2171 | } | |
2172 | ||
2173 | return n; | |
2174 | } | |
2175 | ||
2176 | /* | |
2177 | * Test if chunk_block is valid. If it is, the number of consecutive | |
2178 | * valid blocks from chunk_block will be returned. | |
2179 | */ | |
2180 | int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2181 | sector_t chunk_block) | |
2182 | { | |
2183 | int valid; | |
2184 | ||
2185 | valid = dmz_test_block(zmd, zone, chunk_block); | |
2186 | if (valid <= 0) | |
2187 | return valid; | |
2188 | ||
2189 | /* The block is valid: get the number of valid blocks from block */ | |
2190 | return dmz_to_next_set_block(zmd, zone, chunk_block, | |
2191 | zmd->dev->zone_nr_blocks - chunk_block, 0); | |
2192 | } | |
2193 | ||
2194 | /* | |
2195 | * Find the first valid block from @chunk_block in @zone. | |
2196 | * If such a block is found, its number is returned using | |
2197 | * @chunk_block and the total number of valid blocks from @chunk_block | |
2198 | * is returned. | |
2199 | */ | |
2200 | int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2201 | sector_t *chunk_block) | |
2202 | { | |
2203 | sector_t start_block = *chunk_block; | |
2204 | int ret; | |
2205 | ||
2206 | ret = dmz_to_next_set_block(zmd, zone, start_block, | |
2207 | zmd->dev->zone_nr_blocks - start_block, 1); | |
2208 | if (ret < 0) | |
2209 | return ret; | |
2210 | ||
2211 | start_block += ret; | |
2212 | *chunk_block = start_block; | |
2213 | ||
2214 | return dmz_to_next_set_block(zmd, zone, start_block, | |
2215 | zmd->dev->zone_nr_blocks - start_block, 0); | |
2216 | } | |
2217 | ||
2218 | /* | |
2219 | * Count the number of bits set starting from bit up to bit + nr_bits - 1. | |
2220 | */ | |
2221 | static int dmz_count_bits(void *bitmap, int bit, int nr_bits) | |
2222 | { | |
2223 | unsigned long *addr; | |
2224 | int end = bit + nr_bits; | |
2225 | int n = 0; | |
2226 | ||
2227 | while (bit < end) { | |
2228 | if (((bit & (BITS_PER_LONG - 1)) == 0) && | |
2229 | ((end - bit) >= BITS_PER_LONG)) { | |
2230 | addr = (unsigned long *)bitmap + BIT_WORD(bit); | |
2231 | if (*addr == ULONG_MAX) { | |
2232 | n += BITS_PER_LONG; | |
2233 | bit += BITS_PER_LONG; | |
2234 | continue; | |
2235 | } | |
2236 | } | |
2237 | ||
2238 | if (test_bit(bit, bitmap)) | |
2239 | n++; | |
2240 | bit++; | |
2241 | } | |
2242 | ||
2243 | return n; | |
2244 | } | |
2245 | ||
2246 | /* | |
2247 | * Get a zone weight. | |
2248 | */ | |
2249 | static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone) | |
2250 | { | |
2251 | struct dmz_mblock *mblk; | |
2252 | sector_t chunk_block = 0; | |
2253 | unsigned int bit, nr_bits; | |
2254 | unsigned int nr_blocks = zmd->dev->zone_nr_blocks; | |
2255 | void *bitmap; | |
2256 | int n = 0; | |
2257 | ||
2258 | while (nr_blocks) { | |
2259 | /* Get bitmap block */ | |
2260 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2261 | if (IS_ERR(mblk)) { | |
2262 | n = 0; | |
2263 | break; | |
2264 | } | |
2265 | ||
2266 | /* Count bits in this block */ | |
2267 | bitmap = mblk->data; | |
2268 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
2269 | nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); | |
2270 | n += dmz_count_bits(bitmap, bit, nr_bits); | |
2271 | ||
2272 | dmz_release_mblock(zmd, mblk); | |
2273 | ||
2274 | nr_blocks -= nr_bits; | |
2275 | chunk_block += nr_bits; | |
2276 | } | |
2277 | ||
2278 | zone->weight = n; | |
2279 | } | |
2280 | ||
2281 | /* | |
2282 | * Cleanup the zoned metadata resources. | |
2283 | */ | |
2284 | static void dmz_cleanup_metadata(struct dmz_metadata *zmd) | |
2285 | { | |
2286 | struct rb_root *root; | |
2287 | struct dmz_mblock *mblk, *next; | |
2288 | int i; | |
2289 | ||
2290 | /* Release zone mapping resources */ | |
2291 | if (zmd->map_mblk) { | |
2292 | for (i = 0; i < zmd->nr_map_blocks; i++) | |
2293 | dmz_release_mblock(zmd, zmd->map_mblk[i]); | |
2294 | kfree(zmd->map_mblk); | |
2295 | zmd->map_mblk = NULL; | |
2296 | } | |
2297 | ||
2298 | /* Release super blocks */ | |
2299 | for (i = 0; i < 2; i++) { | |
2300 | if (zmd->sb[i].mblk) { | |
2301 | dmz_free_mblock(zmd, zmd->sb[i].mblk); | |
2302 | zmd->sb[i].mblk = NULL; | |
2303 | } | |
2304 | } | |
2305 | ||
2306 | /* Free cached blocks */ | |
2307 | while (!list_empty(&zmd->mblk_dirty_list)) { | |
2308 | mblk = list_first_entry(&zmd->mblk_dirty_list, | |
2309 | struct dmz_mblock, link); | |
2310 | dmz_dev_warn(zmd->dev, "mblock %llu still in dirty list (ref %u)", | |
2311 | (u64)mblk->no, atomic_read(&mblk->ref)); | |
2312 | list_del_init(&mblk->link); | |
2313 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
2314 | dmz_free_mblock(zmd, mblk); | |
2315 | } | |
2316 | ||
2317 | while (!list_empty(&zmd->mblk_lru_list)) { | |
2318 | mblk = list_first_entry(&zmd->mblk_lru_list, | |
2319 | struct dmz_mblock, link); | |
2320 | list_del_init(&mblk->link); | |
2321 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
2322 | dmz_free_mblock(zmd, mblk); | |
2323 | } | |
2324 | ||
2325 | /* Sanity checks: the mblock rbtree should now be empty */ | |
2326 | root = &zmd->mblk_rbtree; | |
2327 | rbtree_postorder_for_each_entry_safe(mblk, next, root, node) { | |
2328 | dmz_dev_warn(zmd->dev, "mblock %llu ref %u still in rbtree", | |
2329 | (u64)mblk->no, atomic_read(&mblk->ref)); | |
2330 | atomic_set(&mblk->ref, 0); | |
2331 | dmz_free_mblock(zmd, mblk); | |
2332 | } | |
2333 | ||
2334 | /* Free the zone descriptors */ | |
2335 | dmz_drop_zones(zmd); | |
2336 | } | |
2337 | ||
2338 | /* | |
2339 | * Initialize the zoned metadata. | |
2340 | */ | |
2341 | int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **metadata) | |
2342 | { | |
2343 | struct dmz_metadata *zmd; | |
2344 | unsigned int i, zid; | |
2345 | struct dm_zone *zone; | |
2346 | int ret; | |
2347 | ||
2348 | zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL); | |
2349 | if (!zmd) | |
2350 | return -ENOMEM; | |
2351 | ||
2352 | zmd->dev = dev; | |
2353 | zmd->mblk_rbtree = RB_ROOT; | |
2354 | init_rwsem(&zmd->mblk_sem); | |
2355 | mutex_init(&zmd->mblk_flush_lock); | |
2356 | spin_lock_init(&zmd->mblk_lock); | |
2357 | INIT_LIST_HEAD(&zmd->mblk_lru_list); | |
2358 | INIT_LIST_HEAD(&zmd->mblk_dirty_list); | |
2359 | ||
2360 | mutex_init(&zmd->map_lock); | |
2361 | atomic_set(&zmd->unmap_nr_rnd, 0); | |
2362 | INIT_LIST_HEAD(&zmd->unmap_rnd_list); | |
2363 | INIT_LIST_HEAD(&zmd->map_rnd_list); | |
2364 | ||
2365 | atomic_set(&zmd->unmap_nr_seq, 0); | |
2366 | INIT_LIST_HEAD(&zmd->unmap_seq_list); | |
2367 | INIT_LIST_HEAD(&zmd->map_seq_list); | |
2368 | ||
2369 | atomic_set(&zmd->nr_reserved_seq_zones, 0); | |
2370 | INIT_LIST_HEAD(&zmd->reserved_seq_zones_list); | |
2371 | ||
2372 | init_waitqueue_head(&zmd->free_wq); | |
2373 | ||
2374 | /* Initialize zone descriptors */ | |
2375 | ret = dmz_init_zones(zmd); | |
2376 | if (ret) | |
2377 | goto err; | |
2378 | ||
2379 | /* Get super block */ | |
2380 | ret = dmz_load_sb(zmd); | |
2381 | if (ret) | |
2382 | goto err; | |
2383 | ||
2384 | /* Set metadata zones starting from sb_zone */ | |
2385 | zid = dmz_id(zmd, zmd->sb_zone); | |
2386 | for (i = 0; i < zmd->nr_meta_zones << 1; i++) { | |
2387 | zone = dmz_get(zmd, zid + i); | |
2388 | if (!dmz_is_rnd(zone)) | |
2389 | goto err; | |
2390 | set_bit(DMZ_META, &zone->flags); | |
2391 | } | |
2392 | ||
2393 | /* Load mapping table */ | |
2394 | ret = dmz_load_mapping(zmd); | |
2395 | if (ret) | |
2396 | goto err; | |
2397 | ||
2398 | /* | |
2399 | * Cache size boundaries: allow at least 2 super blocks, the chunk map | |
2400 | * blocks and enough blocks to be able to cache the bitmap blocks of | |
2401 | * up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow | |
2402 | * the cache to add 512 more metadata blocks. | |
2403 | */ | |
2404 | zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16; | |
2405 | zmd->max_nr_mblks = zmd->min_nr_mblks + 512; | |
2406 | zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count; | |
2407 | zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan; | |
2408 | zmd->mblk_shrinker.seeks = DEFAULT_SEEKS; | |
2409 | ||
2410 | /* Metadata cache shrinker */ | |
2411 | ret = register_shrinker(&zmd->mblk_shrinker); | |
2412 | if (ret) { | |
2413 | dmz_dev_err(dev, "Register metadata cache shrinker failed"); | |
2414 | goto err; | |
2415 | } | |
2416 | ||
2417 | dmz_dev_info(dev, "Host-%s zoned block device", | |
2418 | bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ? | |
2419 | "aware" : "managed"); | |
2420 | dmz_dev_info(dev, " %llu 512-byte logical sectors", | |
2421 | (u64)dev->capacity); | |
2422 | dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors", | |
2423 | dev->nr_zones, (u64)dev->zone_nr_sectors); | |
2424 | dmz_dev_info(dev, " %u metadata zones", | |
2425 | zmd->nr_meta_zones * 2); | |
2426 | dmz_dev_info(dev, " %u data zones for %u chunks", | |
2427 | zmd->nr_data_zones, zmd->nr_chunks); | |
2428 | dmz_dev_info(dev, " %u random zones (%u unmapped)", | |
2429 | zmd->nr_rnd, atomic_read(&zmd->unmap_nr_rnd)); | |
2430 | dmz_dev_info(dev, " %u sequential zones (%u unmapped)", | |
2431 | zmd->nr_seq, atomic_read(&zmd->unmap_nr_seq)); | |
2432 | dmz_dev_info(dev, " %u reserved sequential data zones", | |
2433 | zmd->nr_reserved_seq); | |
2434 | ||
2435 | dmz_dev_debug(dev, "Format:"); | |
2436 | dmz_dev_debug(dev, "%u metadata blocks per set (%u max cache)", | |
2437 | zmd->nr_meta_blocks, zmd->max_nr_mblks); | |
2438 | dmz_dev_debug(dev, " %u data zone mapping blocks", | |
2439 | zmd->nr_map_blocks); | |
2440 | dmz_dev_debug(dev, " %u bitmap blocks", | |
2441 | zmd->nr_bitmap_blocks); | |
2442 | ||
2443 | *metadata = zmd; | |
2444 | ||
2445 | return 0; | |
2446 | err: | |
2447 | dmz_cleanup_metadata(zmd); | |
2448 | kfree(zmd); | |
2449 | *metadata = NULL; | |
2450 | ||
2451 | return ret; | |
2452 | } | |
2453 | ||
2454 | /* | |
2455 | * Cleanup the zoned metadata resources. | |
2456 | */ | |
2457 | void dmz_dtr_metadata(struct dmz_metadata *zmd) | |
2458 | { | |
2459 | unregister_shrinker(&zmd->mblk_shrinker); | |
2460 | dmz_cleanup_metadata(zmd); | |
2461 | kfree(zmd); | |
2462 | } | |
2463 | ||
2464 | /* | |
2465 | * Check zone information on resume. | |
2466 | */ | |
2467 | int dmz_resume_metadata(struct dmz_metadata *zmd) | |
2468 | { | |
2469 | struct dmz_dev *dev = zmd->dev; | |
2470 | struct dm_zone *zone; | |
2471 | sector_t wp_block; | |
2472 | unsigned int i; | |
2473 | int ret; | |
2474 | ||
2475 | /* Check zones */ | |
2476 | for (i = 0; i < dev->nr_zones; i++) { | |
2477 | zone = dmz_get(zmd, i); | |
2478 | if (!zone) { | |
2479 | dmz_dev_err(dev, "Unable to get zone %u", i); | |
2480 | return -EIO; | |
2481 | } | |
2482 | ||
2483 | wp_block = zone->wp_block; | |
2484 | ||
2485 | ret = dmz_update_zone(zmd, zone); | |
2486 | if (ret) { | |
2487 | dmz_dev_err(dev, "Broken zone %u", i); | |
2488 | return ret; | |
2489 | } | |
2490 | ||
2491 | if (dmz_is_offline(zone)) { | |
2492 | dmz_dev_warn(dev, "Zone %u is offline", i); | |
2493 | continue; | |
2494 | } | |
2495 | ||
2496 | /* Check write pointer */ | |
2497 | if (!dmz_is_seq(zone)) | |
2498 | zone->wp_block = 0; | |
2499 | else if (zone->wp_block != wp_block) { | |
2500 | dmz_dev_err(dev, "Zone %u: Invalid wp (%llu / %llu)", | |
2501 | i, (u64)zone->wp_block, (u64)wp_block); | |
2502 | zone->wp_block = wp_block; | |
2503 | dmz_invalidate_blocks(zmd, zone, zone->wp_block, | |
2504 | dev->zone_nr_blocks - zone->wp_block); | |
2505 | } | |
2506 | } | |
2507 | ||
2508 | return 0; | |
2509 | } |