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bae9a0aa | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3b1a94c8 DLM |
2 | /* |
3 | * Copyright (C) 2017 Western Digital Corporation or its affiliates. | |
4 | * | |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
8 | #include "dm-zoned.h" | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/crc32.h> | |
bd976e52 | 12 | #include <linux/sched/mm.h> |
3b1a94c8 DLM |
13 | |
14 | #define DM_MSG_PREFIX "zoned metadata" | |
15 | ||
16 | /* | |
17 | * Metadata version. | |
18 | */ | |
bd5c4031 | 19 | #define DMZ_META_VER 2 |
3b1a94c8 DLM |
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 | ||
bd5c4031 HR |
72 | /* DM-Zoned label */ |
73 | u8 dmz_label[32]; /* 80 */ | |
74 | ||
75 | /* DM-Zoned UUID */ | |
76 | u8 dmz_uuid[16]; /* 96 */ | |
77 | ||
78 | /* Device UUID */ | |
79 | u8 dev_uuid[16]; /* 112 */ | |
80 | ||
3b1a94c8 | 81 | /* Padding to full 512B sector */ |
bd5c4031 | 82 | u8 reserved[400]; /* 512 */ |
3b1a94c8 DLM |
83 | }; |
84 | ||
85 | /* | |
86 | * Chunk mapping entry: entries are indexed by chunk number | |
87 | * and give the zone ID (dzone_id) mapping the chunk on disk. | |
88 | * This zone may be sequential or random. If it is a sequential | |
89 | * zone, a second zone (bzone_id) used as a write buffer may | |
90 | * also be specified. This second zone will always be a randomly | |
91 | * writeable zone. | |
92 | */ | |
93 | struct dmz_map { | |
94 | __le32 dzone_id; | |
95 | __le32 bzone_id; | |
96 | }; | |
97 | ||
98 | /* | |
99 | * Chunk mapping table metadata: 512 8-bytes entries per 4KB block. | |
100 | */ | |
101 | #define DMZ_MAP_ENTRIES (DMZ_BLOCK_SIZE / sizeof(struct dmz_map)) | |
102 | #define DMZ_MAP_ENTRIES_SHIFT (ilog2(DMZ_MAP_ENTRIES)) | |
103 | #define DMZ_MAP_ENTRIES_MASK (DMZ_MAP_ENTRIES - 1) | |
104 | #define DMZ_MAP_UNMAPPED UINT_MAX | |
105 | ||
106 | /* | |
107 | * Meta data block descriptor (for cached metadata blocks). | |
108 | */ | |
109 | struct dmz_mblock { | |
110 | struct rb_node node; | |
111 | struct list_head link; | |
112 | sector_t no; | |
33c2865f | 113 | unsigned int ref; |
3b1a94c8 DLM |
114 | unsigned long state; |
115 | struct page *page; | |
116 | void *data; | |
117 | }; | |
118 | ||
119 | /* | |
120 | * Metadata block state flags. | |
121 | */ | |
122 | enum { | |
123 | DMZ_META_DIRTY, | |
124 | DMZ_META_READING, | |
125 | DMZ_META_WRITING, | |
126 | DMZ_META_ERROR, | |
127 | }; | |
128 | ||
129 | /* | |
130 | * Super block information (one per metadata set). | |
131 | */ | |
132 | struct dmz_sb { | |
133 | sector_t block; | |
bf28a3ba | 134 | struct dmz_dev *dev; |
3b1a94c8 DLM |
135 | struct dmz_mblock *mblk; |
136 | struct dmz_super *sb; | |
735bd7e4 | 137 | struct dm_zone *zone; |
3b1a94c8 DLM |
138 | }; |
139 | ||
140 | /* | |
141 | * In-memory metadata. | |
142 | */ | |
143 | struct dmz_metadata { | |
144 | struct dmz_dev *dev; | |
bd5c4031 | 145 | unsigned int nr_devs; |
3b1a94c8 | 146 | |
2234e732 | 147 | char devname[BDEVNAME_SIZE]; |
bd5c4031 HR |
148 | char label[BDEVNAME_SIZE]; |
149 | uuid_t uuid; | |
3b1a94c8 DLM |
150 | |
151 | sector_t zone_bitmap_size; | |
152 | unsigned int zone_nr_bitmap_blocks; | |
b3996295 | 153 | unsigned int zone_bits_per_mblk; |
3b1a94c8 | 154 | |
36820560 HR |
155 | sector_t zone_nr_blocks; |
156 | sector_t zone_nr_blocks_shift; | |
157 | ||
158 | sector_t zone_nr_sectors; | |
159 | sector_t zone_nr_sectors_shift; | |
160 | ||
3b1a94c8 DLM |
161 | unsigned int nr_bitmap_blocks; |
162 | unsigned int nr_map_blocks; | |
163 | ||
36820560 | 164 | unsigned int nr_zones; |
3b1a94c8 DLM |
165 | unsigned int nr_useable_zones; |
166 | unsigned int nr_meta_blocks; | |
167 | unsigned int nr_meta_zones; | |
168 | unsigned int nr_data_zones; | |
34f5affd | 169 | unsigned int nr_cache_zones; |
3b1a94c8 DLM |
170 | unsigned int nr_rnd_zones; |
171 | unsigned int nr_reserved_seq; | |
172 | unsigned int nr_chunks; | |
173 | ||
174 | /* Zone information array */ | |
a92fbc44 | 175 | struct xarray zones; |
3b1a94c8 | 176 | |
3b1a94c8 DLM |
177 | struct dmz_sb sb[2]; |
178 | unsigned int mblk_primary; | |
bd5c4031 | 179 | unsigned int sb_version; |
3b1a94c8 DLM |
180 | u64 sb_gen; |
181 | unsigned int min_nr_mblks; | |
182 | unsigned int max_nr_mblks; | |
183 | atomic_t nr_mblks; | |
184 | struct rw_semaphore mblk_sem; | |
185 | struct mutex mblk_flush_lock; | |
186 | spinlock_t mblk_lock; | |
187 | struct rb_root mblk_rbtree; | |
188 | struct list_head mblk_lru_list; | |
189 | struct list_head mblk_dirty_list; | |
ba3d6aca | 190 | struct shrinker *mblk_shrinker; |
3b1a94c8 DLM |
191 | |
192 | /* Zone allocation management */ | |
193 | struct mutex map_lock; | |
194 | struct dmz_mblock **map_mblk; | |
3b1a94c8 | 195 | |
34f5affd HR |
196 | unsigned int nr_cache; |
197 | atomic_t unmap_nr_cache; | |
198 | struct list_head unmap_cache_list; | |
199 | struct list_head map_cache_list; | |
3b1a94c8 DLM |
200 | |
201 | atomic_t nr_reserved_seq_zones; | |
202 | struct list_head reserved_seq_zones_list; | |
203 | ||
204 | wait_queue_head_t free_wq; | |
205 | }; | |
206 | ||
ca1a7045 | 207 | #define dmz_zmd_info(zmd, format, args...) \ |
bd5c4031 | 208 | DMINFO("(%s): " format, (zmd)->label, ## args) |
ca1a7045 HR |
209 | |
210 | #define dmz_zmd_err(zmd, format, args...) \ | |
bd5c4031 | 211 | DMERR("(%s): " format, (zmd)->label, ## args) |
ca1a7045 HR |
212 | |
213 | #define dmz_zmd_warn(zmd, format, args...) \ | |
bd5c4031 | 214 | DMWARN("(%s): " format, (zmd)->label, ## args) |
ca1a7045 HR |
215 | |
216 | #define dmz_zmd_debug(zmd, format, args...) \ | |
bd5c4031 | 217 | DMDEBUG("(%s): " format, (zmd)->label, ## args) |
3b1a94c8 DLM |
218 | /* |
219 | * Various accessors | |
220 | */ | |
bd5c4031 | 221 | static unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone) |
3b1a94c8 | 222 | { |
bd5c4031 HR |
223 | if (WARN_ON(!zone)) |
224 | return 0; | |
225 | ||
8f22272a | 226 | return zone->id - zone->dev->zone_offset; |
3b1a94c8 DLM |
227 | } |
228 | ||
229 | sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone) | |
230 | { | |
bd5c4031 HR |
231 | unsigned int zone_id = dmz_dev_zone_id(zmd, zone); |
232 | ||
233 | return (sector_t)zone_id << zmd->zone_nr_sectors_shift; | |
3b1a94c8 DLM |
234 | } |
235 | ||
236 | sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone) | |
237 | { | |
bd5c4031 HR |
238 | unsigned int zone_id = dmz_dev_zone_id(zmd, zone); |
239 | ||
240 | return (sector_t)zone_id << zmd->zone_nr_blocks_shift; | |
3b1a94c8 DLM |
241 | } |
242 | ||
36820560 HR |
243 | unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd) |
244 | { | |
245 | return zmd->zone_nr_blocks; | |
246 | } | |
247 | ||
248 | unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd) | |
249 | { | |
250 | return zmd->zone_nr_blocks_shift; | |
251 | } | |
252 | ||
253 | unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd) | |
254 | { | |
255 | return zmd->zone_nr_sectors; | |
256 | } | |
257 | ||
258 | unsigned int dmz_zone_nr_sectors_shift(struct dmz_metadata *zmd) | |
259 | { | |
260 | return zmd->zone_nr_sectors_shift; | |
261 | } | |
262 | ||
bc3d5717 HR |
263 | unsigned int dmz_nr_zones(struct dmz_metadata *zmd) |
264 | { | |
36820560 | 265 | return zmd->nr_zones; |
3b1a94c8 DLM |
266 | } |
267 | ||
268 | unsigned int dmz_nr_chunks(struct dmz_metadata *zmd) | |
269 | { | |
270 | return zmd->nr_chunks; | |
271 | } | |
272 | ||
bd82fdab | 273 | unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd, int idx) |
3b1a94c8 | 274 | { |
bd82fdab | 275 | return zmd->dev[idx].nr_rnd; |
3b1a94c8 DLM |
276 | } |
277 | ||
bd82fdab | 278 | unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd, int idx) |
3b1a94c8 | 279 | { |
bd82fdab | 280 | return atomic_read(&zmd->dev[idx].unmap_nr_rnd); |
3b1a94c8 DLM |
281 | } |
282 | ||
34f5affd HR |
283 | unsigned int dmz_nr_cache_zones(struct dmz_metadata *zmd) |
284 | { | |
285 | return zmd->nr_cache; | |
286 | } | |
287 | ||
288 | unsigned int dmz_nr_unmap_cache_zones(struct dmz_metadata *zmd) | |
289 | { | |
290 | return atomic_read(&zmd->unmap_nr_cache); | |
291 | } | |
292 | ||
bd82fdab | 293 | unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd, int idx) |
bc3d5717 | 294 | { |
bd82fdab | 295 | return zmd->dev[idx].nr_seq; |
bc3d5717 HR |
296 | } |
297 | ||
bd82fdab | 298 | unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd, int idx) |
bc3d5717 | 299 | { |
bd82fdab | 300 | return atomic_read(&zmd->dev[idx].unmap_nr_seq); |
bc3d5717 HR |
301 | } |
302 | ||
a92fbc44 HR |
303 | static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id) |
304 | { | |
305 | return xa_load(&zmd->zones, zone_id); | |
306 | } | |
307 | ||
308 | static struct dm_zone *dmz_insert(struct dmz_metadata *zmd, | |
8f22272a | 309 | unsigned int zone_id, struct dmz_dev *dev) |
a92fbc44 HR |
310 | { |
311 | struct dm_zone *zone = kzalloc(sizeof(struct dm_zone), GFP_KERNEL); | |
312 | ||
313 | if (!zone) | |
314 | return ERR_PTR(-ENOMEM); | |
315 | ||
316 | if (xa_insert(&zmd->zones, zone_id, zone, GFP_KERNEL)) { | |
317 | kfree(zone); | |
318 | return ERR_PTR(-EBUSY); | |
319 | } | |
320 | ||
321 | INIT_LIST_HEAD(&zone->link); | |
322 | atomic_set(&zone->refcount, 0); | |
323 | zone->id = zone_id; | |
324 | zone->chunk = DMZ_MAP_UNMAPPED; | |
8f22272a | 325 | zone->dev = dev; |
a92fbc44 HR |
326 | |
327 | return zone; | |
328 | } | |
329 | ||
2234e732 HR |
330 | const char *dmz_metadata_label(struct dmz_metadata *zmd) |
331 | { | |
bd5c4031 | 332 | return (const char *)zmd->label; |
2234e732 HR |
333 | } |
334 | ||
d0e21ce4 HR |
335 | bool dmz_check_dev(struct dmz_metadata *zmd) |
336 | { | |
bd5c4031 HR |
337 | unsigned int i; |
338 | ||
339 | for (i = 0; i < zmd->nr_devs; i++) { | |
340 | if (!dmz_check_bdev(&zmd->dev[i])) | |
341 | return false; | |
342 | } | |
343 | return true; | |
d0e21ce4 HR |
344 | } |
345 | ||
346 | bool dmz_dev_is_dying(struct dmz_metadata *zmd) | |
347 | { | |
bd5c4031 HR |
348 | unsigned int i; |
349 | ||
350 | for (i = 0; i < zmd->nr_devs; i++) { | |
351 | if (dmz_bdev_is_dying(&zmd->dev[i])) | |
352 | return true; | |
353 | } | |
354 | return false; | |
3b1a94c8 DLM |
355 | } |
356 | ||
357 | /* | |
358 | * Lock/unlock mapping table. | |
359 | * The map lock also protects all the zone lists. | |
360 | */ | |
361 | void dmz_lock_map(struct dmz_metadata *zmd) | |
362 | { | |
363 | mutex_lock(&zmd->map_lock); | |
364 | } | |
365 | ||
366 | void dmz_unlock_map(struct dmz_metadata *zmd) | |
367 | { | |
368 | mutex_unlock(&zmd->map_lock); | |
369 | } | |
370 | ||
371 | /* | |
372 | * Lock/unlock metadata access. This is a "read" lock on a semaphore | |
373 | * that prevents metadata flush from running while metadata are being | |
374 | * modified. The actual metadata write mutual exclusion is achieved with | |
ad1bd578 | 375 | * the map lock and zone state management (active and reclaim state are |
3b1a94c8 DLM |
376 | * mutually exclusive). |
377 | */ | |
378 | void dmz_lock_metadata(struct dmz_metadata *zmd) | |
379 | { | |
380 | down_read(&zmd->mblk_sem); | |
381 | } | |
382 | ||
383 | void dmz_unlock_metadata(struct dmz_metadata *zmd) | |
384 | { | |
385 | up_read(&zmd->mblk_sem); | |
386 | } | |
387 | ||
388 | /* | |
389 | * Lock/unlock flush: prevent concurrent executions | |
390 | * of dmz_flush_metadata as well as metadata modification in reclaim | |
391 | * while flush is being executed. | |
392 | */ | |
393 | void dmz_lock_flush(struct dmz_metadata *zmd) | |
394 | { | |
395 | mutex_lock(&zmd->mblk_flush_lock); | |
396 | } | |
397 | ||
398 | void dmz_unlock_flush(struct dmz_metadata *zmd) | |
399 | { | |
400 | mutex_unlock(&zmd->mblk_flush_lock); | |
401 | } | |
402 | ||
403 | /* | |
404 | * Allocate a metadata block. | |
405 | */ | |
406 | static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd, | |
407 | sector_t mblk_no) | |
408 | { | |
409 | struct dmz_mblock *mblk = NULL; | |
410 | ||
411 | /* See if we can reuse cached blocks */ | |
412 | if (zmd->max_nr_mblks && atomic_read(&zmd->nr_mblks) > zmd->max_nr_mblks) { | |
413 | spin_lock(&zmd->mblk_lock); | |
414 | mblk = list_first_entry_or_null(&zmd->mblk_lru_list, | |
415 | struct dmz_mblock, link); | |
416 | if (mblk) { | |
417 | list_del_init(&mblk->link); | |
418 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
419 | mblk->no = mblk_no; | |
420 | } | |
421 | spin_unlock(&zmd->mblk_lock); | |
422 | if (mblk) | |
423 | return mblk; | |
424 | } | |
425 | ||
426 | /* Allocate a new block */ | |
427 | mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO); | |
428 | if (!mblk) | |
429 | return NULL; | |
430 | ||
431 | mblk->page = alloc_page(GFP_NOIO); | |
432 | if (!mblk->page) { | |
433 | kfree(mblk); | |
434 | return NULL; | |
435 | } | |
436 | ||
437 | RB_CLEAR_NODE(&mblk->node); | |
438 | INIT_LIST_HEAD(&mblk->link); | |
33c2865f | 439 | mblk->ref = 0; |
3b1a94c8 DLM |
440 | mblk->state = 0; |
441 | mblk->no = mblk_no; | |
442 | mblk->data = page_address(mblk->page); | |
443 | ||
444 | atomic_inc(&zmd->nr_mblks); | |
445 | ||
446 | return mblk; | |
447 | } | |
448 | ||
449 | /* | |
450 | * Free a metadata block. | |
451 | */ | |
452 | static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) | |
453 | { | |
454 | __free_pages(mblk->page, 0); | |
455 | kfree(mblk); | |
456 | ||
457 | atomic_dec(&zmd->nr_mblks); | |
458 | } | |
459 | ||
460 | /* | |
461 | * Insert a metadata block in the rbtree. | |
462 | */ | |
463 | static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) | |
464 | { | |
465 | struct rb_root *root = &zmd->mblk_rbtree; | |
466 | struct rb_node **new = &(root->rb_node), *parent = NULL; | |
467 | struct dmz_mblock *b; | |
468 | ||
469 | /* Figure out where to put the new node */ | |
470 | while (*new) { | |
471 | b = container_of(*new, struct dmz_mblock, node); | |
472 | parent = *new; | |
473 | new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right); | |
474 | } | |
475 | ||
476 | /* Add new node and rebalance tree */ | |
477 | rb_link_node(&mblk->node, parent, new); | |
478 | rb_insert_color(&mblk->node, root); | |
479 | } | |
480 | ||
481 | /* | |
3d4e7383 DLM |
482 | * Lookup a metadata block in the rbtree. If the block is found, increment |
483 | * its reference count. | |
3b1a94c8 | 484 | */ |
3d4e7383 DLM |
485 | static struct dmz_mblock *dmz_get_mblock_fast(struct dmz_metadata *zmd, |
486 | sector_t mblk_no) | |
3b1a94c8 DLM |
487 | { |
488 | struct rb_root *root = &zmd->mblk_rbtree; | |
489 | struct rb_node *node = root->rb_node; | |
490 | struct dmz_mblock *mblk; | |
491 | ||
492 | while (node) { | |
493 | mblk = container_of(node, struct dmz_mblock, node); | |
3d4e7383 DLM |
494 | if (mblk->no == mblk_no) { |
495 | /* | |
496 | * If this is the first reference to the block, | |
497 | * remove it from the LRU list. | |
498 | */ | |
499 | mblk->ref++; | |
500 | if (mblk->ref == 1 && | |
501 | !test_bit(DMZ_META_DIRTY, &mblk->state)) | |
502 | list_del_init(&mblk->link); | |
3b1a94c8 | 503 | return mblk; |
3d4e7383 | 504 | } |
3b1a94c8 DLM |
505 | node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right; |
506 | } | |
507 | ||
508 | return NULL; | |
509 | } | |
510 | ||
511 | /* | |
512 | * Metadata block BIO end callback. | |
513 | */ | |
514 | static void dmz_mblock_bio_end_io(struct bio *bio) | |
515 | { | |
516 | struct dmz_mblock *mblk = bio->bi_private; | |
517 | int flag; | |
518 | ||
519 | if (bio->bi_status) | |
520 | set_bit(DMZ_META_ERROR, &mblk->state); | |
521 | ||
522 | if (bio_op(bio) == REQ_OP_WRITE) | |
523 | flag = DMZ_META_WRITING; | |
524 | else | |
525 | flag = DMZ_META_READING; | |
526 | ||
527 | clear_bit_unlock(flag, &mblk->state); | |
528 | smp_mb__after_atomic(); | |
529 | wake_up_bit(&mblk->state, flag); | |
530 | ||
531 | bio_put(bio); | |
532 | } | |
533 | ||
534 | /* | |
3d4e7383 | 535 | * Read an uncached metadata block from disk and add it to the cache. |
3b1a94c8 | 536 | */ |
3d4e7383 DLM |
537 | static struct dmz_mblock *dmz_get_mblock_slow(struct dmz_metadata *zmd, |
538 | sector_t mblk_no) | |
3b1a94c8 | 539 | { |
3d4e7383 | 540 | struct dmz_mblock *mblk, *m; |
3b1a94c8 | 541 | sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no; |
bf28a3ba | 542 | struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev; |
3b1a94c8 DLM |
543 | struct bio *bio; |
544 | ||
bf28a3ba | 545 | if (dmz_bdev_is_dying(dev)) |
75d66ffb DF |
546 | return ERR_PTR(-EIO); |
547 | ||
3d4e7383 | 548 | /* Get a new block and a BIO to read it */ |
3b1a94c8 DLM |
549 | mblk = dmz_alloc_mblock(zmd, mblk_no); |
550 | if (!mblk) | |
75d66ffb | 551 | return ERR_PTR(-ENOMEM); |
3b1a94c8 | 552 | |
07888c66 CH |
553 | bio = bio_alloc(dev->bdev, 1, REQ_OP_READ | REQ_META | REQ_PRIO, |
554 | GFP_NOIO); | |
3b1a94c8 | 555 | |
3d4e7383 DLM |
556 | spin_lock(&zmd->mblk_lock); |
557 | ||
558 | /* | |
559 | * Make sure that another context did not start reading | |
560 | * the block already. | |
561 | */ | |
562 | m = dmz_get_mblock_fast(zmd, mblk_no); | |
563 | if (m) { | |
564 | spin_unlock(&zmd->mblk_lock); | |
565 | dmz_free_mblock(zmd, mblk); | |
566 | bio_put(bio); | |
567 | return m; | |
568 | } | |
569 | ||
570 | mblk->ref++; | |
571 | set_bit(DMZ_META_READING, &mblk->state); | |
572 | dmz_insert_mblock(zmd, mblk); | |
573 | ||
574 | spin_unlock(&zmd->mblk_lock); | |
575 | ||
576 | /* Submit read BIO */ | |
3b1a94c8 | 577 | bio->bi_iter.bi_sector = dmz_blk2sect(block); |
3b1a94c8 DLM |
578 | bio->bi_private = mblk; |
579 | bio->bi_end_io = dmz_mblock_bio_end_io; | |
fc8ac3e5 | 580 | __bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); |
3b1a94c8 DLM |
581 | submit_bio(bio); |
582 | ||
583 | return mblk; | |
584 | } | |
585 | ||
586 | /* | |
587 | * Free metadata blocks. | |
588 | */ | |
589 | static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd, | |
590 | unsigned long limit) | |
591 | { | |
592 | struct dmz_mblock *mblk; | |
593 | unsigned long count = 0; | |
594 | ||
595 | if (!zmd->max_nr_mblks) | |
596 | return 0; | |
597 | ||
598 | while (!list_empty(&zmd->mblk_lru_list) && | |
599 | atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks && | |
600 | count < limit) { | |
601 | mblk = list_first_entry(&zmd->mblk_lru_list, | |
602 | struct dmz_mblock, link); | |
603 | list_del_init(&mblk->link); | |
604 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
605 | dmz_free_mblock(zmd, mblk); | |
606 | count++; | |
607 | } | |
608 | ||
609 | return count; | |
610 | } | |
611 | ||
612 | /* | |
613 | * For mblock shrinker: get the number of unused metadata blocks in the cache. | |
614 | */ | |
615 | static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink, | |
616 | struct shrink_control *sc) | |
617 | { | |
ba3d6aca | 618 | struct dmz_metadata *zmd = shrink->private_data; |
3b1a94c8 DLM |
619 | |
620 | return atomic_read(&zmd->nr_mblks); | |
621 | } | |
622 | ||
623 | /* | |
624 | * For mblock shrinker: scan unused metadata blocks and shrink the cache. | |
625 | */ | |
626 | static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink, | |
627 | struct shrink_control *sc) | |
628 | { | |
ba3d6aca | 629 | struct dmz_metadata *zmd = shrink->private_data; |
3b1a94c8 DLM |
630 | unsigned long count; |
631 | ||
632 | spin_lock(&zmd->mblk_lock); | |
633 | count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan); | |
634 | spin_unlock(&zmd->mblk_lock); | |
635 | ||
636 | return count ? count : SHRINK_STOP; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Release a metadata block. | |
641 | */ | |
642 | static void dmz_release_mblock(struct dmz_metadata *zmd, | |
643 | struct dmz_mblock *mblk) | |
644 | { | |
645 | ||
646 | if (!mblk) | |
647 | return; | |
648 | ||
649 | spin_lock(&zmd->mblk_lock); | |
650 | ||
33c2865f DLM |
651 | mblk->ref--; |
652 | if (mblk->ref == 0) { | |
3b1a94c8 DLM |
653 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { |
654 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
655 | dmz_free_mblock(zmd, mblk); | |
656 | } else if (!test_bit(DMZ_META_DIRTY, &mblk->state)) { | |
657 | list_add_tail(&mblk->link, &zmd->mblk_lru_list); | |
658 | dmz_shrink_mblock_cache(zmd, 1); | |
659 | } | |
660 | } | |
661 | ||
662 | spin_unlock(&zmd->mblk_lock); | |
663 | } | |
664 | ||
665 | /* | |
666 | * Get a metadata block from the rbtree. If the block | |
667 | * is not present, read it from disk. | |
668 | */ | |
669 | static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd, | |
670 | sector_t mblk_no) | |
671 | { | |
672 | struct dmz_mblock *mblk; | |
bf28a3ba | 673 | struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev; |
3b1a94c8 DLM |
674 | |
675 | /* Check rbtree */ | |
676 | spin_lock(&zmd->mblk_lock); | |
3d4e7383 | 677 | mblk = dmz_get_mblock_fast(zmd, mblk_no); |
3b1a94c8 DLM |
678 | spin_unlock(&zmd->mblk_lock); |
679 | ||
680 | if (!mblk) { | |
681 | /* Cache miss: read the block from disk */ | |
3d4e7383 | 682 | mblk = dmz_get_mblock_slow(zmd, mblk_no); |
75d66ffb DF |
683 | if (IS_ERR(mblk)) |
684 | return mblk; | |
3b1a94c8 DLM |
685 | } |
686 | ||
687 | /* Wait for on-going read I/O and check for error */ | |
688 | wait_on_bit_io(&mblk->state, DMZ_META_READING, | |
689 | TASK_UNINTERRUPTIBLE); | |
690 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { | |
691 | dmz_release_mblock(zmd, mblk); | |
bf28a3ba | 692 | dmz_check_bdev(dev); |
3b1a94c8 DLM |
693 | return ERR_PTR(-EIO); |
694 | } | |
695 | ||
696 | return mblk; | |
697 | } | |
698 | ||
699 | /* | |
700 | * Mark a metadata block dirty. | |
701 | */ | |
702 | static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) | |
703 | { | |
704 | spin_lock(&zmd->mblk_lock); | |
705 | if (!test_and_set_bit(DMZ_META_DIRTY, &mblk->state)) | |
706 | list_add_tail(&mblk->link, &zmd->mblk_dirty_list); | |
707 | spin_unlock(&zmd->mblk_lock); | |
708 | } | |
709 | ||
710 | /* | |
711 | * Issue a metadata block write BIO. | |
712 | */ | |
75d66ffb DF |
713 | static int dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk, |
714 | unsigned int set) | |
3b1a94c8 | 715 | { |
bf28a3ba | 716 | struct dmz_dev *dev = zmd->sb[set].dev; |
3b1a94c8 DLM |
717 | sector_t block = zmd->sb[set].block + mblk->no; |
718 | struct bio *bio; | |
719 | ||
bf28a3ba | 720 | if (dmz_bdev_is_dying(dev)) |
75d66ffb DF |
721 | return -EIO; |
722 | ||
07888c66 CH |
723 | bio = bio_alloc(dev->bdev, 1, REQ_OP_WRITE | REQ_META | REQ_PRIO, |
724 | GFP_NOIO); | |
3b1a94c8 DLM |
725 | |
726 | set_bit(DMZ_META_WRITING, &mblk->state); | |
727 | ||
728 | bio->bi_iter.bi_sector = dmz_blk2sect(block); | |
3b1a94c8 DLM |
729 | bio->bi_private = mblk; |
730 | bio->bi_end_io = dmz_mblock_bio_end_io; | |
fc8ac3e5 | 731 | __bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); |
3b1a94c8 | 732 | submit_bio(bio); |
75d66ffb DF |
733 | |
734 | return 0; | |
3b1a94c8 DLM |
735 | } |
736 | ||
737 | /* | |
738 | * Read/write a metadata block. | |
739 | */ | |
13a1f650 | 740 | static int dmz_rdwr_block(struct dmz_dev *dev, enum req_op op, |
bf28a3ba | 741 | sector_t block, struct page *page) |
3b1a94c8 DLM |
742 | { |
743 | struct bio *bio; | |
744 | int ret; | |
745 | ||
bd5c4031 HR |
746 | if (WARN_ON(!dev)) |
747 | return -EIO; | |
748 | ||
bf28a3ba | 749 | if (dmz_bdev_is_dying(dev)) |
75d66ffb DF |
750 | return -EIO; |
751 | ||
07888c66 CH |
752 | bio = bio_alloc(dev->bdev, 1, op | REQ_SYNC | REQ_META | REQ_PRIO, |
753 | GFP_NOIO); | |
3b1a94c8 | 754 | bio->bi_iter.bi_sector = dmz_blk2sect(block); |
fc8ac3e5 | 755 | __bio_add_page(bio, page, DMZ_BLOCK_SIZE, 0); |
3b1a94c8 DLM |
756 | ret = submit_bio_wait(bio); |
757 | bio_put(bio); | |
758 | ||
e7fad909 | 759 | if (ret) |
bf28a3ba | 760 | dmz_check_bdev(dev); |
3b1a94c8 DLM |
761 | return ret; |
762 | } | |
763 | ||
764 | /* | |
765 | * Write super block of the specified metadata set. | |
766 | */ | |
767 | static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set) | |
768 | { | |
3b1a94c8 DLM |
769 | struct dmz_mblock *mblk = zmd->sb[set].mblk; |
770 | struct dmz_super *sb = zmd->sb[set].sb; | |
bf28a3ba | 771 | struct dmz_dev *dev = zmd->sb[set].dev; |
bd5c4031 | 772 | sector_t sb_block; |
3b1a94c8 DLM |
773 | u64 sb_gen = zmd->sb_gen + 1; |
774 | int ret; | |
775 | ||
776 | sb->magic = cpu_to_le32(DMZ_MAGIC); | |
bd5c4031 HR |
777 | |
778 | sb->version = cpu_to_le32(zmd->sb_version); | |
779 | if (zmd->sb_version > 1) { | |
780 | BUILD_BUG_ON(UUID_SIZE != 16); | |
781 | export_uuid(sb->dmz_uuid, &zmd->uuid); | |
782 | memcpy(sb->dmz_label, zmd->label, BDEVNAME_SIZE); | |
783 | export_uuid(sb->dev_uuid, &dev->uuid); | |
784 | } | |
3b1a94c8 DLM |
785 | |
786 | sb->gen = cpu_to_le64(sb_gen); | |
787 | ||
bd5c4031 HR |
788 | /* |
789 | * The metadata always references the absolute block address, | |
790 | * ie relative to the entire block range, not the per-device | |
791 | * block address. | |
792 | */ | |
793 | sb_block = zmd->sb[set].zone->id << zmd->zone_nr_blocks_shift; | |
794 | sb->sb_block = cpu_to_le64(sb_block); | |
3b1a94c8 DLM |
795 | sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks); |
796 | sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq); | |
797 | sb->nr_chunks = cpu_to_le32(zmd->nr_chunks); | |
798 | ||
799 | sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks); | |
800 | sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks); | |
801 | ||
802 | sb->crc = 0; | |
803 | sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE)); | |
804 | ||
bd5c4031 HR |
805 | ret = dmz_rdwr_block(dev, REQ_OP_WRITE, zmd->sb[set].block, |
806 | mblk->page); | |
3b1a94c8 | 807 | if (ret == 0) |
c6bf3f0e | 808 | ret = blkdev_issue_flush(dev->bdev); |
3b1a94c8 DLM |
809 | |
810 | return ret; | |
811 | } | |
812 | ||
813 | /* | |
814 | * Write dirty metadata blocks to the specified set. | |
815 | */ | |
816 | static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd, | |
817 | struct list_head *write_list, | |
818 | unsigned int set) | |
819 | { | |
820 | struct dmz_mblock *mblk; | |
bf28a3ba | 821 | struct dmz_dev *dev = zmd->sb[set].dev; |
3b1a94c8 | 822 | struct blk_plug plug; |
75d66ffb | 823 | int ret = 0, nr_mblks_submitted = 0; |
3b1a94c8 DLM |
824 | |
825 | /* Issue writes */ | |
826 | blk_start_plug(&plug); | |
75d66ffb DF |
827 | list_for_each_entry(mblk, write_list, link) { |
828 | ret = dmz_write_mblock(zmd, mblk, set); | |
829 | if (ret) | |
830 | break; | |
831 | nr_mblks_submitted++; | |
832 | } | |
3b1a94c8 DLM |
833 | blk_finish_plug(&plug); |
834 | ||
835 | /* Wait for completion */ | |
836 | list_for_each_entry(mblk, write_list, link) { | |
75d66ffb DF |
837 | if (!nr_mblks_submitted) |
838 | break; | |
3b1a94c8 DLM |
839 | wait_on_bit_io(&mblk->state, DMZ_META_WRITING, |
840 | TASK_UNINTERRUPTIBLE); | |
841 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { | |
842 | clear_bit(DMZ_META_ERROR, &mblk->state); | |
bf28a3ba | 843 | dmz_check_bdev(dev); |
3b1a94c8 DLM |
844 | ret = -EIO; |
845 | } | |
75d66ffb | 846 | nr_mblks_submitted--; |
3b1a94c8 DLM |
847 | } |
848 | ||
849 | /* Flush drive cache (this will also sync data) */ | |
850 | if (ret == 0) | |
c6bf3f0e | 851 | ret = blkdev_issue_flush(dev->bdev); |
3b1a94c8 DLM |
852 | |
853 | return ret; | |
854 | } | |
855 | ||
856 | /* | |
857 | * Log dirty metadata blocks. | |
858 | */ | |
859 | static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd, | |
860 | struct list_head *write_list) | |
861 | { | |
862 | unsigned int log_set = zmd->mblk_primary ^ 0x1; | |
863 | int ret; | |
864 | ||
865 | /* Write dirty blocks to the log */ | |
866 | ret = dmz_write_dirty_mblocks(zmd, write_list, log_set); | |
867 | if (ret) | |
868 | return ret; | |
869 | ||
870 | /* | |
871 | * No error so far: now validate the log by updating the | |
872 | * log index super block generation. | |
873 | */ | |
874 | ret = dmz_write_sb(zmd, log_set); | |
875 | if (ret) | |
876 | return ret; | |
877 | ||
878 | return 0; | |
879 | } | |
880 | ||
881 | /* | |
882 | * Flush dirty metadata blocks. | |
883 | */ | |
884 | int dmz_flush_metadata(struct dmz_metadata *zmd) | |
885 | { | |
886 | struct dmz_mblock *mblk; | |
887 | struct list_head write_list; | |
bf28a3ba | 888 | struct dmz_dev *dev; |
3b1a94c8 DLM |
889 | int ret; |
890 | ||
891 | if (WARN_ON(!zmd)) | |
892 | return 0; | |
893 | ||
894 | INIT_LIST_HEAD(&write_list); | |
895 | ||
896 | /* | |
897 | * Make sure that metadata blocks are stable before logging: take | |
898 | * the write lock on the metadata semaphore to prevent target BIOs | |
899 | * from modifying metadata. | |
900 | */ | |
901 | down_write(&zmd->mblk_sem); | |
bf28a3ba | 902 | dev = zmd->sb[zmd->mblk_primary].dev; |
3b1a94c8 DLM |
903 | |
904 | /* | |
905 | * This is called from the target flush work and reclaim work. | |
906 | * Concurrent execution is not allowed. | |
907 | */ | |
908 | dmz_lock_flush(zmd); | |
909 | ||
bf28a3ba | 910 | if (dmz_bdev_is_dying(dev)) { |
75d66ffb DF |
911 | ret = -EIO; |
912 | goto out; | |
913 | } | |
914 | ||
3b1a94c8 DLM |
915 | /* Get dirty blocks */ |
916 | spin_lock(&zmd->mblk_lock); | |
917 | list_splice_init(&zmd->mblk_dirty_list, &write_list); | |
918 | spin_unlock(&zmd->mblk_lock); | |
919 | ||
920 | /* If there are no dirty metadata blocks, just flush the device cache */ | |
921 | if (list_empty(&write_list)) { | |
c6bf3f0e | 922 | ret = blkdev_issue_flush(dev->bdev); |
e7fad909 | 923 | goto err; |
3b1a94c8 DLM |
924 | } |
925 | ||
926 | /* | |
927 | * The primary metadata set is still clean. Keep it this way until | |
928 | * all updates are successful in the secondary set. That is, use | |
929 | * the secondary set as a log. | |
930 | */ | |
931 | ret = dmz_log_dirty_mblocks(zmd, &write_list); | |
932 | if (ret) | |
e7fad909 | 933 | goto err; |
3b1a94c8 DLM |
934 | |
935 | /* | |
936 | * The log is on disk. It is now safe to update in place | |
937 | * in the primary metadata set. | |
938 | */ | |
939 | ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary); | |
940 | if (ret) | |
e7fad909 | 941 | goto err; |
3b1a94c8 DLM |
942 | |
943 | ret = dmz_write_sb(zmd, zmd->mblk_primary); | |
944 | if (ret) | |
e7fad909 | 945 | goto err; |
3b1a94c8 DLM |
946 | |
947 | while (!list_empty(&write_list)) { | |
948 | mblk = list_first_entry(&write_list, struct dmz_mblock, link); | |
949 | list_del_init(&mblk->link); | |
950 | ||
951 | spin_lock(&zmd->mblk_lock); | |
952 | clear_bit(DMZ_META_DIRTY, &mblk->state); | |
33c2865f | 953 | if (mblk->ref == 0) |
3b1a94c8 DLM |
954 | list_add_tail(&mblk->link, &zmd->mblk_lru_list); |
955 | spin_unlock(&zmd->mblk_lock); | |
956 | } | |
957 | ||
958 | zmd->sb_gen++; | |
959 | out: | |
3b1a94c8 DLM |
960 | dmz_unlock_flush(zmd); |
961 | up_write(&zmd->mblk_sem); | |
962 | ||
963 | return ret; | |
e7fad909 DF |
964 | |
965 | err: | |
966 | if (!list_empty(&write_list)) { | |
967 | spin_lock(&zmd->mblk_lock); | |
968 | list_splice(&write_list, &zmd->mblk_dirty_list); | |
969 | spin_unlock(&zmd->mblk_lock); | |
970 | } | |
bf28a3ba | 971 | if (!dmz_check_bdev(dev)) |
e7fad909 DF |
972 | ret = -EIO; |
973 | goto out; | |
3b1a94c8 DLM |
974 | } |
975 | ||
976 | /* | |
977 | * Check super block. | |
978 | */ | |
5d2c74f3 HR |
979 | static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_sb *dsb, |
980 | bool tertiary) | |
3b1a94c8 | 981 | { |
5d2c74f3 HR |
982 | struct dmz_super *sb = dsb->sb; |
983 | struct dmz_dev *dev = dsb->dev; | |
3b1a94c8 | 984 | unsigned int nr_meta_zones, nr_data_zones; |
3b1a94c8 | 985 | u32 crc, stored_crc; |
27d49ac1 | 986 | u64 gen, sb_block; |
3b1a94c8 | 987 | |
bd5c4031 HR |
988 | if (le32_to_cpu(sb->magic) != DMZ_MAGIC) { |
989 | dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)", | |
990 | DMZ_MAGIC, le32_to_cpu(sb->magic)); | |
991 | return -ENXIO; | |
992 | } | |
993 | ||
994 | zmd->sb_version = le32_to_cpu(sb->version); | |
995 | if (zmd->sb_version > DMZ_META_VER) { | |
996 | dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)", | |
997 | DMZ_META_VER, zmd->sb_version); | |
998 | return -EINVAL; | |
999 | } | |
5d2c74f3 | 1000 | if (zmd->sb_version < 2 && tertiary) { |
bd5c4031 HR |
1001 | dmz_dev_err(dev, "Tertiary superblocks are not supported"); |
1002 | return -EINVAL; | |
1003 | } | |
3b1a94c8 DLM |
1004 | |
1005 | gen = le64_to_cpu(sb->gen); | |
1006 | stored_crc = le32_to_cpu(sb->crc); | |
1007 | sb->crc = 0; | |
1008 | crc = crc32_le(gen, (unsigned char *)sb, DMZ_BLOCK_SIZE); | |
1009 | if (crc != stored_crc) { | |
1010 | dmz_dev_err(dev, "Invalid checksum (needed 0x%08x, got 0x%08x)", | |
1011 | crc, stored_crc); | |
1012 | return -ENXIO; | |
1013 | } | |
1014 | ||
27d49ac1 | 1015 | sb_block = le64_to_cpu(sb->sb_block); |
43be9c74 | 1016 | if (sb_block != (u64)dsb->zone->id << zmd->zone_nr_blocks_shift) { |
2e84fecf HM |
1017 | dmz_dev_err(dev, "Invalid superblock position (is %llu expected %llu)", |
1018 | sb_block, (u64)dsb->zone->id << zmd->zone_nr_blocks_shift); | |
27d49ac1 HR |
1019 | return -EINVAL; |
1020 | } | |
bd5c4031 HR |
1021 | if (zmd->sb_version > 1) { |
1022 | uuid_t sb_uuid; | |
1023 | ||
1024 | import_uuid(&sb_uuid, sb->dmz_uuid); | |
1025 | if (uuid_is_null(&sb_uuid)) { | |
1026 | dmz_dev_err(dev, "NULL DM-Zoned uuid"); | |
1027 | return -ENXIO; | |
1028 | } else if (uuid_is_null(&zmd->uuid)) { | |
1029 | uuid_copy(&zmd->uuid, &sb_uuid); | |
1030 | } else if (!uuid_equal(&zmd->uuid, &sb_uuid)) { | |
2e84fecf | 1031 | dmz_dev_err(dev, "mismatching DM-Zoned uuid, is %pUl expected %pUl", |
bd5c4031 HR |
1032 | &sb_uuid, &zmd->uuid); |
1033 | return -ENXIO; | |
1034 | } | |
1035 | if (!strlen(zmd->label)) | |
1036 | memcpy(zmd->label, sb->dmz_label, BDEVNAME_SIZE); | |
1037 | else if (memcmp(zmd->label, sb->dmz_label, BDEVNAME_SIZE)) { | |
2e84fecf | 1038 | dmz_dev_err(dev, "mismatching DM-Zoned label, is %s expected %s", |
bd5c4031 HR |
1039 | sb->dmz_label, zmd->label); |
1040 | return -ENXIO; | |
1041 | } | |
1042 | import_uuid(&dev->uuid, sb->dev_uuid); | |
1043 | if (uuid_is_null(&dev->uuid)) { | |
1044 | dmz_dev_err(dev, "NULL device uuid"); | |
1045 | return -ENXIO; | |
1046 | } | |
3b1a94c8 | 1047 | |
5d2c74f3 | 1048 | if (tertiary) { |
bd5c4031 HR |
1049 | /* |
1050 | * Generation number should be 0, but it doesn't | |
1051 | * really matter if it isn't. | |
1052 | */ | |
1053 | if (gen != 0) | |
1054 | dmz_dev_warn(dev, "Invalid generation %llu", | |
1055 | gen); | |
1056 | return 0; | |
1057 | } | |
3b1a94c8 DLM |
1058 | } |
1059 | ||
36820560 HR |
1060 | nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + zmd->zone_nr_blocks - 1) |
1061 | >> zmd->zone_nr_blocks_shift; | |
3b1a94c8 | 1062 | if (!nr_meta_zones || |
b38c0ad5 SK |
1063 | (zmd->nr_devs <= 1 && nr_meta_zones >= zmd->nr_rnd_zones) || |
1064 | (zmd->nr_devs > 1 && nr_meta_zones >= zmd->nr_cache_zones)) { | |
3b1a94c8 DLM |
1065 | dmz_dev_err(dev, "Invalid number of metadata blocks"); |
1066 | return -ENXIO; | |
1067 | } | |
1068 | ||
1069 | if (!le32_to_cpu(sb->nr_reserved_seq) || | |
1070 | le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) { | |
1071 | dmz_dev_err(dev, "Invalid number of reserved sequential zones"); | |
1072 | return -ENXIO; | |
1073 | } | |
1074 | ||
1075 | nr_data_zones = zmd->nr_useable_zones - | |
1076 | (nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq)); | |
1077 | if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) { | |
1078 | dmz_dev_err(dev, "Invalid number of chunks %u / %u", | |
1079 | le32_to_cpu(sb->nr_chunks), nr_data_zones); | |
1080 | return -ENXIO; | |
1081 | } | |
1082 | ||
1083 | /* OK */ | |
1084 | zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks); | |
1085 | zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq); | |
1086 | zmd->nr_chunks = le32_to_cpu(sb->nr_chunks); | |
1087 | zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks); | |
1088 | zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks); | |
1089 | zmd->nr_meta_zones = nr_meta_zones; | |
1090 | zmd->nr_data_zones = nr_data_zones; | |
1091 | ||
1092 | return 0; | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * Read the first or second super block from disk. | |
1097 | */ | |
5d2c74f3 | 1098 | static int dmz_read_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set) |
3b1a94c8 | 1099 | { |
977ff73e CH |
1100 | dmz_zmd_debug(zmd, "read superblock set %d dev %pg block %llu", |
1101 | set, sb->dev->bdev, sb->block); | |
35d0c96e | 1102 | |
5d2c74f3 HR |
1103 | return dmz_rdwr_block(sb->dev, REQ_OP_READ, |
1104 | sb->block, sb->mblk->page); | |
3b1a94c8 DLM |
1105 | } |
1106 | ||
1107 | /* | |
1108 | * Determine the position of the secondary super blocks on disk. | |
1109 | * This is used only if a corruption of the primary super block | |
1110 | * is detected. | |
1111 | */ | |
1112 | static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd) | |
1113 | { | |
36820560 | 1114 | unsigned int zone_nr_blocks = zmd->zone_nr_blocks; |
3b1a94c8 | 1115 | struct dmz_mblock *mblk; |
a92fbc44 | 1116 | unsigned int zone_id = zmd->sb[0].zone->id; |
3b1a94c8 DLM |
1117 | int i; |
1118 | ||
1119 | /* Allocate a block */ | |
1120 | mblk = dmz_alloc_mblock(zmd, 0); | |
1121 | if (!mblk) | |
1122 | return -ENOMEM; | |
1123 | ||
1124 | zmd->sb[1].mblk = mblk; | |
1125 | zmd->sb[1].sb = mblk->data; | |
1126 | ||
1127 | /* Bad first super block: search for the second one */ | |
1128 | zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks; | |
a92fbc44 | 1129 | zmd->sb[1].zone = dmz_get(zmd, zone_id + 1); |
1565929b | 1130 | zmd->sb[1].dev = zmd->sb[0].dev; |
a92fbc44 | 1131 | for (i = 1; i < zmd->nr_rnd_zones; i++) { |
5d2c74f3 | 1132 | if (dmz_read_sb(zmd, &zmd->sb[1], 1) != 0) |
3b1a94c8 DLM |
1133 | break; |
1134 | if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC) | |
1135 | return 0; | |
1136 | zmd->sb[1].block += zone_nr_blocks; | |
a92fbc44 | 1137 | zmd->sb[1].zone = dmz_get(zmd, zone_id + i); |
3b1a94c8 DLM |
1138 | } |
1139 | ||
1140 | dmz_free_mblock(zmd, mblk); | |
1141 | zmd->sb[1].mblk = NULL; | |
735bd7e4 | 1142 | zmd->sb[1].zone = NULL; |
bf28a3ba | 1143 | zmd->sb[1].dev = NULL; |
3b1a94c8 DLM |
1144 | |
1145 | return -EIO; | |
1146 | } | |
1147 | ||
1148 | /* | |
5d2c74f3 | 1149 | * Read a super block from disk. |
3b1a94c8 | 1150 | */ |
5d2c74f3 | 1151 | static int dmz_get_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set) |
3b1a94c8 DLM |
1152 | { |
1153 | struct dmz_mblock *mblk; | |
1154 | int ret; | |
1155 | ||
1156 | /* Allocate a block */ | |
1157 | mblk = dmz_alloc_mblock(zmd, 0); | |
1158 | if (!mblk) | |
1159 | return -ENOMEM; | |
1160 | ||
5d2c74f3 HR |
1161 | sb->mblk = mblk; |
1162 | sb->sb = mblk->data; | |
3b1a94c8 DLM |
1163 | |
1164 | /* Read super block */ | |
5d2c74f3 | 1165 | ret = dmz_read_sb(zmd, sb, set); |
3b1a94c8 DLM |
1166 | if (ret) { |
1167 | dmz_free_mblock(zmd, mblk); | |
5d2c74f3 | 1168 | sb->mblk = NULL; |
3b1a94c8 DLM |
1169 | return ret; |
1170 | } | |
1171 | ||
1172 | return 0; | |
1173 | } | |
1174 | ||
1175 | /* | |
1176 | * Recover a metadata set. | |
1177 | */ | |
1178 | static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set) | |
1179 | { | |
1180 | unsigned int src_set = dst_set ^ 0x1; | |
1181 | struct page *page; | |
1182 | int i, ret; | |
1183 | ||
bf28a3ba HR |
1184 | dmz_dev_warn(zmd->sb[dst_set].dev, |
1185 | "Metadata set %u invalid: recovering", dst_set); | |
3b1a94c8 DLM |
1186 | |
1187 | if (dst_set == 0) | |
735bd7e4 HR |
1188 | zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone); |
1189 | else | |
1190 | zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone); | |
3b1a94c8 | 1191 | |
4218a955 | 1192 | page = alloc_page(GFP_NOIO); |
3b1a94c8 DLM |
1193 | if (!page) |
1194 | return -ENOMEM; | |
1195 | ||
1196 | /* Copy metadata blocks */ | |
1197 | for (i = 1; i < zmd->nr_meta_blocks; i++) { | |
bf28a3ba | 1198 | ret = dmz_rdwr_block(zmd->sb[src_set].dev, REQ_OP_READ, |
3b1a94c8 DLM |
1199 | zmd->sb[src_set].block + i, page); |
1200 | if (ret) | |
1201 | goto out; | |
bf28a3ba | 1202 | ret = dmz_rdwr_block(zmd->sb[dst_set].dev, REQ_OP_WRITE, |
3b1a94c8 DLM |
1203 | zmd->sb[dst_set].block + i, page); |
1204 | if (ret) | |
1205 | goto out; | |
1206 | } | |
1207 | ||
1208 | /* Finalize with the super block */ | |
1209 | if (!zmd->sb[dst_set].mblk) { | |
1210 | zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0); | |
1211 | if (!zmd->sb[dst_set].mblk) { | |
1212 | ret = -ENOMEM; | |
1213 | goto out; | |
1214 | } | |
1215 | zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data; | |
1216 | } | |
1217 | ||
1218 | ret = dmz_write_sb(zmd, dst_set); | |
1219 | out: | |
1220 | __free_pages(page, 0); | |
1221 | ||
1222 | return ret; | |
1223 | } | |
1224 | ||
1225 | /* | |
1226 | * Get super block from disk. | |
1227 | */ | |
1228 | static int dmz_load_sb(struct dmz_metadata *zmd) | |
1229 | { | |
1230 | bool sb_good[2] = {false, false}; | |
1231 | u64 sb_gen[2] = {0, 0}; | |
1232 | int ret; | |
1233 | ||
735bd7e4 | 1234 | if (!zmd->sb[0].zone) { |
ca1a7045 | 1235 | dmz_zmd_err(zmd, "Primary super block zone not set"); |
735bd7e4 HR |
1236 | return -ENXIO; |
1237 | } | |
1238 | ||
3b1a94c8 | 1239 | /* Read and check the primary super block */ |
735bd7e4 | 1240 | zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone); |
8f22272a | 1241 | zmd->sb[0].dev = zmd->sb[0].zone->dev; |
5d2c74f3 | 1242 | ret = dmz_get_sb(zmd, &zmd->sb[0], 0); |
3b1a94c8 | 1243 | if (ret) { |
bf28a3ba | 1244 | dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed"); |
3b1a94c8 DLM |
1245 | return ret; |
1246 | } | |
1247 | ||
5d2c74f3 | 1248 | ret = dmz_check_sb(zmd, &zmd->sb[0], false); |
3b1a94c8 DLM |
1249 | |
1250 | /* Read and check secondary super block */ | |
1251 | if (ret == 0) { | |
1252 | sb_good[0] = true; | |
a92fbc44 HR |
1253 | if (!zmd->sb[1].zone) { |
1254 | unsigned int zone_id = | |
1255 | zmd->sb[0].zone->id + zmd->nr_meta_zones; | |
1256 | ||
1257 | zmd->sb[1].zone = dmz_get(zmd, zone_id); | |
1258 | } | |
735bd7e4 | 1259 | zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone); |
1565929b | 1260 | zmd->sb[1].dev = zmd->sb[0].dev; |
5d2c74f3 | 1261 | ret = dmz_get_sb(zmd, &zmd->sb[1], 1); |
3b1a94c8 DLM |
1262 | } else |
1263 | ret = dmz_lookup_secondary_sb(zmd); | |
1264 | ||
1265 | if (ret) { | |
bf28a3ba | 1266 | dmz_dev_err(zmd->sb[1].dev, "Read secondary super block failed"); |
3b1a94c8 DLM |
1267 | return ret; |
1268 | } | |
1269 | ||
5d2c74f3 | 1270 | ret = dmz_check_sb(zmd, &zmd->sb[1], false); |
3b1a94c8 DLM |
1271 | if (ret == 0) |
1272 | sb_good[1] = true; | |
1273 | ||
1274 | /* Use highest generation sb first */ | |
1275 | if (!sb_good[0] && !sb_good[1]) { | |
ca1a7045 | 1276 | dmz_zmd_err(zmd, "No valid super block found"); |
3b1a94c8 DLM |
1277 | return -EIO; |
1278 | } | |
1279 | ||
1280 | if (sb_good[0]) | |
1281 | sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen); | |
bf28a3ba | 1282 | else { |
3b1a94c8 | 1283 | ret = dmz_recover_mblocks(zmd, 0); |
bf28a3ba HR |
1284 | if (ret) { |
1285 | dmz_dev_err(zmd->sb[0].dev, | |
1286 | "Recovery of superblock 0 failed"); | |
1287 | return -EIO; | |
1288 | } | |
1289 | } | |
3b1a94c8 DLM |
1290 | |
1291 | if (sb_good[1]) | |
1292 | sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen); | |
bf28a3ba | 1293 | else { |
3b1a94c8 DLM |
1294 | ret = dmz_recover_mblocks(zmd, 1); |
1295 | ||
bf28a3ba HR |
1296 | if (ret) { |
1297 | dmz_dev_err(zmd->sb[1].dev, | |
1298 | "Recovery of superblock 1 failed"); | |
1299 | return -EIO; | |
1300 | } | |
3b1a94c8 DLM |
1301 | } |
1302 | ||
1303 | if (sb_gen[0] >= sb_gen[1]) { | |
1304 | zmd->sb_gen = sb_gen[0]; | |
1305 | zmd->mblk_primary = 0; | |
1306 | } else { | |
1307 | zmd->sb_gen = sb_gen[1]; | |
1308 | zmd->mblk_primary = 1; | |
1309 | } | |
1310 | ||
bf28a3ba HR |
1311 | dmz_dev_debug(zmd->sb[zmd->mblk_primary].dev, |
1312 | "Using super block %u (gen %llu)", | |
3b1a94c8 DLM |
1313 | zmd->mblk_primary, zmd->sb_gen); |
1314 | ||
5d2c74f3 HR |
1315 | if (zmd->sb_version > 1) { |
1316 | int i; | |
1317 | struct dmz_sb *sb; | |
1318 | ||
1319 | sb = kzalloc(sizeof(struct dmz_sb), GFP_KERNEL); | |
1320 | if (!sb) | |
1321 | return -ENOMEM; | |
1322 | for (i = 1; i < zmd->nr_devs; i++) { | |
1323 | sb->block = 0; | |
1324 | sb->zone = dmz_get(zmd, zmd->dev[i].zone_offset); | |
1325 | sb->dev = &zmd->dev[i]; | |
1326 | if (!dmz_is_meta(sb->zone)) { | |
1327 | dmz_dev_err(sb->dev, | |
1328 | "Tertiary super block zone %u not marked as metadata zone", | |
1329 | sb->zone->id); | |
1330 | ret = -EINVAL; | |
1331 | goto out_kfree; | |
1332 | } | |
1333 | ret = dmz_get_sb(zmd, sb, i + 1); | |
1334 | if (ret) { | |
1335 | dmz_dev_err(sb->dev, | |
1336 | "Read tertiary super block failed"); | |
1337 | dmz_free_mblock(zmd, sb->mblk); | |
1338 | goto out_kfree; | |
1339 | } | |
1340 | ret = dmz_check_sb(zmd, sb, true); | |
1341 | dmz_free_mblock(zmd, sb->mblk); | |
1342 | if (ret == -EINVAL) | |
1343 | goto out_kfree; | |
bd5c4031 | 1344 | } |
a6ba79c0 | 1345 | out_kfree: |
5d2c74f3 | 1346 | kfree(sb); |
bd5c4031 | 1347 | } |
5d2c74f3 | 1348 | return ret; |
3b1a94c8 DLM |
1349 | } |
1350 | ||
1351 | /* | |
1352 | * Initialize a zone descriptor. | |
1353 | */ | |
bd5c4031 | 1354 | static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data) |
3b1a94c8 | 1355 | { |
18979819 HR |
1356 | struct dmz_dev *dev = data; |
1357 | struct dmz_metadata *zmd = dev->metadata; | |
bd5c4031 | 1358 | int idx = num + dev->zone_offset; |
a92fbc44 HR |
1359 | struct dm_zone *zone; |
1360 | ||
8f22272a | 1361 | zone = dmz_insert(zmd, idx, dev); |
a92fbc44 HR |
1362 | if (IS_ERR(zone)) |
1363 | return PTR_ERR(zone); | |
3b1a94c8 | 1364 | |
36820560 | 1365 | if (blkz->len != zmd->zone_nr_sectors) { |
bd5c4031 HR |
1366 | if (zmd->sb_version > 1) { |
1367 | /* Ignore the eventual runt (smaller) zone */ | |
1368 | set_bit(DMZ_OFFLINE, &zone->flags); | |
1369 | return 0; | |
1370 | } else if (blkz->start + blkz->len == dev->capacity) | |
3b1a94c8 DLM |
1371 | return 0; |
1372 | return -ENXIO; | |
1373 | } | |
1374 | ||
bab68499 DLM |
1375 | /* |
1376 | * Devices that have zones with a capacity smaller than the zone size | |
1377 | * (e.g. NVMe zoned namespaces) are not supported. | |
1378 | */ | |
1379 | if (blkz->capacity != blkz->len) | |
1380 | return -ENXIO; | |
1381 | ||
d4100351 CH |
1382 | switch (blkz->type) { |
1383 | case BLK_ZONE_TYPE_CONVENTIONAL: | |
3b1a94c8 | 1384 | set_bit(DMZ_RND, &zone->flags); |
d4100351 CH |
1385 | break; |
1386 | case BLK_ZONE_TYPE_SEQWRITE_REQ: | |
1387 | case BLK_ZONE_TYPE_SEQWRITE_PREF: | |
3b1a94c8 | 1388 | set_bit(DMZ_SEQ, &zone->flags); |
d4100351 CH |
1389 | break; |
1390 | default: | |
3b1a94c8 | 1391 | return -ENXIO; |
d4100351 | 1392 | } |
3b1a94c8 DLM |
1393 | |
1394 | if (dmz_is_rnd(zone)) | |
1395 | zone->wp_block = 0; | |
1396 | else | |
1397 | zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); | |
1398 | ||
d4100351 CH |
1399 | if (blkz->cond == BLK_ZONE_COND_OFFLINE) |
1400 | set_bit(DMZ_OFFLINE, &zone->flags); | |
1401 | else if (blkz->cond == BLK_ZONE_COND_READONLY) | |
1402 | set_bit(DMZ_READ_ONLY, &zone->flags); | |
1403 | else { | |
3b1a94c8 DLM |
1404 | zmd->nr_useable_zones++; |
1405 | if (dmz_is_rnd(zone)) { | |
1406 | zmd->nr_rnd_zones++; | |
bd5c4031 HR |
1407 | if (zmd->nr_devs == 1 && !zmd->sb[0].zone) { |
1408 | /* Primary super block zone */ | |
735bd7e4 | 1409 | zmd->sb[0].zone = zone; |
3b1a94c8 DLM |
1410 | } |
1411 | } | |
5d2c74f3 HR |
1412 | if (zmd->nr_devs > 1 && num == 0) { |
1413 | /* | |
1414 | * Tertiary superblock zones are always at the | |
1415 | * start of the zoned devices, so mark them | |
1416 | * as metadata zone. | |
1417 | */ | |
1418 | set_bit(DMZ_META, &zone->flags); | |
bd5c4031 | 1419 | } |
3b1a94c8 | 1420 | } |
3b1a94c8 DLM |
1421 | return 0; |
1422 | } | |
1423 | ||
a92fbc44 | 1424 | static int dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev) |
bd5c4031 HR |
1425 | { |
1426 | int idx; | |
1427 | sector_t zone_offset = 0; | |
3b1a94c8 | 1428 | |
96422281 | 1429 | for (idx = 0; idx < dev->nr_zones; idx++) { |
a92fbc44 | 1430 | struct dm_zone *zone; |
bd5c4031 | 1431 | |
8f22272a | 1432 | zone = dmz_insert(zmd, idx, dev); |
a92fbc44 HR |
1433 | if (IS_ERR(zone)) |
1434 | return PTR_ERR(zone); | |
34f5affd | 1435 | set_bit(DMZ_CACHE, &zone->flags); |
bd5c4031 | 1436 | zone->wp_block = 0; |
34f5affd | 1437 | zmd->nr_cache_zones++; |
bd5c4031 HR |
1438 | zmd->nr_useable_zones++; |
1439 | if (dev->capacity - zone_offset < zmd->zone_nr_sectors) { | |
1440 | /* Disable runt zone */ | |
1441 | set_bit(DMZ_OFFLINE, &zone->flags); | |
1442 | break; | |
1443 | } | |
1444 | zone_offset += zmd->zone_nr_sectors; | |
1445 | } | |
3b1a94c8 DLM |
1446 | return 0; |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * Free zones descriptors. | |
1451 | */ | |
1452 | static void dmz_drop_zones(struct dmz_metadata *zmd) | |
1453 | { | |
a92fbc44 HR |
1454 | int idx; |
1455 | ||
96422281 | 1456 | for (idx = 0; idx < zmd->nr_zones; idx++) { |
a92fbc44 HR |
1457 | struct dm_zone *zone = xa_load(&zmd->zones, idx); |
1458 | ||
1459 | kfree(zone); | |
1460 | xa_erase(&zmd->zones, idx); | |
1461 | } | |
1462 | xa_destroy(&zmd->zones); | |
3b1a94c8 DLM |
1463 | } |
1464 | ||
3b1a94c8 DLM |
1465 | /* |
1466 | * Allocate and initialize zone descriptors using the zone | |
1467 | * information from disk. | |
1468 | */ | |
1469 | static int dmz_init_zones(struct dmz_metadata *zmd) | |
1470 | { | |
bd5c4031 HR |
1471 | int i, ret; |
1472 | struct dmz_dev *zoned_dev = &zmd->dev[0]; | |
3b1a94c8 DLM |
1473 | |
1474 | /* Init */ | |
bd5c4031 | 1475 | zmd->zone_nr_sectors = zmd->dev[0].zone_nr_sectors; |
36820560 HR |
1476 | zmd->zone_nr_sectors_shift = ilog2(zmd->zone_nr_sectors); |
1477 | zmd->zone_nr_blocks = dmz_sect2blk(zmd->zone_nr_sectors); | |
1478 | zmd->zone_nr_blocks_shift = ilog2(zmd->zone_nr_blocks); | |
1479 | zmd->zone_bitmap_size = zmd->zone_nr_blocks >> 3; | |
b3996295 DF |
1480 | zmd->zone_nr_bitmap_blocks = |
1481 | max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT); | |
36820560 | 1482 | zmd->zone_bits_per_mblk = min_t(sector_t, zmd->zone_nr_blocks, |
b3996295 | 1483 | DMZ_BLOCK_SIZE_BITS); |
3b1a94c8 DLM |
1484 | |
1485 | /* Allocate zone array */ | |
bd5c4031 | 1486 | zmd->nr_zones = 0; |
18979819 HR |
1487 | for (i = 0; i < zmd->nr_devs; i++) { |
1488 | struct dmz_dev *dev = &zmd->dev[i]; | |
1489 | ||
1490 | dev->metadata = zmd; | |
1491 | zmd->nr_zones += dev->nr_zones; | |
bd82fdab HR |
1492 | |
1493 | atomic_set(&dev->unmap_nr_rnd, 0); | |
1494 | INIT_LIST_HEAD(&dev->unmap_rnd_list); | |
1495 | INIT_LIST_HEAD(&dev->map_rnd_list); | |
1496 | ||
1497 | atomic_set(&dev->unmap_nr_seq, 0); | |
1498 | INIT_LIST_HEAD(&dev->unmap_seq_list); | |
1499 | INIT_LIST_HEAD(&dev->map_seq_list); | |
18979819 | 1500 | } |
bd5c4031 HR |
1501 | |
1502 | if (!zmd->nr_zones) { | |
1503 | DMERR("(%s): No zones found", zmd->devname); | |
1504 | return -ENXIO; | |
1505 | } | |
a92fbc44 | 1506 | xa_init(&zmd->zones); |
3b1a94c8 | 1507 | |
ae3c1f11 HR |
1508 | DMDEBUG("(%s): Using %zu B for zone information", |
1509 | zmd->devname, sizeof(struct dm_zone) * zmd->nr_zones); | |
3b1a94c8 | 1510 | |
bd5c4031 | 1511 | if (zmd->nr_devs > 1) { |
a92fbc44 HR |
1512 | ret = dmz_emulate_zones(zmd, &zmd->dev[0]); |
1513 | if (ret < 0) { | |
1514 | DMDEBUG("(%s): Failed to emulate zones, error %d", | |
1515 | zmd->devname, ret); | |
1516 | dmz_drop_zones(zmd); | |
1517 | return ret; | |
1518 | } | |
1519 | ||
bd5c4031 HR |
1520 | /* |
1521 | * Primary superblock zone is always at zone 0 when multiple | |
1522 | * drives are present. | |
1523 | */ | |
a92fbc44 | 1524 | zmd->sb[0].zone = dmz_get(zmd, 0); |
bd5c4031 | 1525 | |
4dba1288 HR |
1526 | for (i = 1; i < zmd->nr_devs; i++) { |
1527 | zoned_dev = &zmd->dev[i]; | |
1528 | ||
1529 | ret = blkdev_report_zones(zoned_dev->bdev, 0, | |
1530 | BLK_ALL_ZONES, | |
1531 | dmz_init_zone, zoned_dev); | |
1532 | if (ret < 0) { | |
1533 | DMDEBUG("(%s): Failed to report zones, error %d", | |
1534 | zmd->devname, ret); | |
1535 | dmz_drop_zones(zmd); | |
1536 | return ret; | |
1537 | } | |
1538 | } | |
1539 | return 0; | |
bd5c4031 | 1540 | } |
3b1a94c8 | 1541 | |
3b1a94c8 | 1542 | /* |
d4100351 CH |
1543 | * Get zone information and initialize zone descriptors. At the same |
1544 | * time, determine where the super block should be: first block of the | |
1545 | * first randomly writable zone. | |
3b1a94c8 | 1546 | */ |
bd5c4031 | 1547 | ret = blkdev_report_zones(zoned_dev->bdev, 0, BLK_ALL_ZONES, |
18979819 | 1548 | dmz_init_zone, zoned_dev); |
d4100351 | 1549 | if (ret < 0) { |
bd5c4031 HR |
1550 | DMDEBUG("(%s): Failed to report zones, error %d", |
1551 | zmd->devname, ret); | |
d4100351 CH |
1552 | dmz_drop_zones(zmd); |
1553 | return ret; | |
1554 | } | |
3b1a94c8 | 1555 | |
d4100351 CH |
1556 | return 0; |
1557 | } | |
7aedf75f | 1558 | |
d4100351 CH |
1559 | static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx, |
1560 | void *data) | |
1561 | { | |
1562 | struct dm_zone *zone = data; | |
3b1a94c8 | 1563 | |
d4100351 CH |
1564 | clear_bit(DMZ_OFFLINE, &zone->flags); |
1565 | clear_bit(DMZ_READ_ONLY, &zone->flags); | |
1566 | if (blkz->cond == BLK_ZONE_COND_OFFLINE) | |
1567 | set_bit(DMZ_OFFLINE, &zone->flags); | |
1568 | else if (blkz->cond == BLK_ZONE_COND_READONLY) | |
1569 | set_bit(DMZ_READ_ONLY, &zone->flags); | |
3b1a94c8 | 1570 | |
d4100351 CH |
1571 | if (dmz_is_seq(zone)) |
1572 | zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); | |
1573 | else | |
1574 | zone->wp_block = 0; | |
1575 | return 0; | |
3b1a94c8 DLM |
1576 | } |
1577 | ||
1578 | /* | |
1579 | * Update a zone information. | |
1580 | */ | |
1581 | static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1582 | { | |
8f22272a | 1583 | struct dmz_dev *dev = zone->dev; |
bd976e52 | 1584 | unsigned int noio_flag; |
3b1a94c8 DLM |
1585 | int ret; |
1586 | ||
bd5c4031 HR |
1587 | if (dev->flags & DMZ_BDEV_REGULAR) |
1588 | return 0; | |
1589 | ||
bd976e52 DLM |
1590 | /* |
1591 | * Get zone information from disk. Since blkdev_report_zones() uses | |
1592 | * GFP_KERNEL by default for memory allocations, set the per-task | |
1593 | * PF_MEMALLOC_NOIO flag so that all allocations are done as if | |
1594 | * GFP_NOIO was specified. | |
1595 | */ | |
1596 | noio_flag = memalloc_noio_save(); | |
aa821c8d | 1597 | ret = blkdev_report_zones(dev->bdev, dmz_start_sect(zmd, zone), 1, |
d4100351 | 1598 | dmz_update_zone_cb, zone); |
bd976e52 | 1599 | memalloc_noio_restore(noio_flag); |
d4100351 CH |
1600 | |
1601 | if (ret == 0) | |
7aedf75f | 1602 | ret = -EIO; |
d4100351 | 1603 | if (ret < 0) { |
aa821c8d | 1604 | dmz_dev_err(dev, "Get zone %u report failed", |
b7122873 | 1605 | zone->id); |
aa821c8d | 1606 | dmz_check_bdev(dev); |
3b1a94c8 DLM |
1607 | return ret; |
1608 | } | |
1609 | ||
3b1a94c8 DLM |
1610 | return 0; |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * Check a zone write pointer position when the zone is marked | |
1615 | * with the sequential write error flag. | |
1616 | */ | |
1617 | static int dmz_handle_seq_write_err(struct dmz_metadata *zmd, | |
1618 | struct dm_zone *zone) | |
1619 | { | |
8f22272a | 1620 | struct dmz_dev *dev = zone->dev; |
3b1a94c8 DLM |
1621 | unsigned int wp = 0; |
1622 | int ret; | |
1623 | ||
1624 | wp = zone->wp_block; | |
1625 | ret = dmz_update_zone(zmd, zone); | |
1626 | if (ret) | |
1627 | return ret; | |
1628 | ||
aa821c8d | 1629 | dmz_dev_warn(dev, "Processing zone %u write error (zone wp %u/%u)", |
b7122873 | 1630 | zone->id, zone->wp_block, wp); |
3b1a94c8 DLM |
1631 | |
1632 | if (zone->wp_block < wp) { | |
1633 | dmz_invalidate_blocks(zmd, zone, zone->wp_block, | |
1634 | wp - zone->wp_block); | |
1635 | } | |
1636 | ||
1637 | return 0; | |
1638 | } | |
1639 | ||
3b1a94c8 DLM |
1640 | /* |
1641 | * Reset a zone write pointer. | |
1642 | */ | |
1643 | static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1644 | { | |
1645 | int ret; | |
1646 | ||
1647 | /* | |
1648 | * Ignore offline zones, read only zones, | |
1649 | * and conventional zones. | |
1650 | */ | |
1651 | if (dmz_is_offline(zone) || | |
1652 | dmz_is_readonly(zone) || | |
1653 | dmz_is_rnd(zone)) | |
1654 | return 0; | |
1655 | ||
1656 | if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) { | |
8f22272a | 1657 | struct dmz_dev *dev = zone->dev; |
21808201 | 1658 | unsigned int noio_flag; |
3b1a94c8 | 1659 | |
21808201 | 1660 | noio_flag = memalloc_noio_save(); |
6c1b1da5 AJ |
1661 | ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET, |
1662 | dmz_start_sect(zmd, zone), | |
71f4ecdb | 1663 | zmd->zone_nr_sectors); |
21808201 | 1664 | memalloc_noio_restore(noio_flag); |
3b1a94c8 DLM |
1665 | if (ret) { |
1666 | dmz_dev_err(dev, "Reset zone %u failed %d", | |
b7122873 | 1667 | zone->id, ret); |
3b1a94c8 DLM |
1668 | return ret; |
1669 | } | |
1670 | } | |
1671 | ||
1672 | /* Clear write error bit and rewind write pointer position */ | |
1673 | clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags); | |
1674 | zone->wp_block = 0; | |
1675 | ||
1676 | return 0; | |
1677 | } | |
1678 | ||
1679 | static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone); | |
1680 | ||
1681 | /* | |
1682 | * Initialize chunk mapping. | |
1683 | */ | |
1684 | static int dmz_load_mapping(struct dmz_metadata *zmd) | |
1685 | { | |
3b1a94c8 DLM |
1686 | struct dm_zone *dzone, *bzone; |
1687 | struct dmz_mblock *dmap_mblk = NULL; | |
1688 | struct dmz_map *dmap; | |
1689 | unsigned int i = 0, e = 0, chunk = 0; | |
1690 | unsigned int dzone_id; | |
1691 | unsigned int bzone_id; | |
1692 | ||
1693 | /* Metadata block array for the chunk mapping table */ | |
1694 | zmd->map_mblk = kcalloc(zmd->nr_map_blocks, | |
1695 | sizeof(struct dmz_mblk *), GFP_KERNEL); | |
1696 | if (!zmd->map_mblk) | |
1697 | return -ENOMEM; | |
1698 | ||
1699 | /* Get chunk mapping table blocks and initialize zone mapping */ | |
1700 | while (chunk < zmd->nr_chunks) { | |
1701 | if (!dmap_mblk) { | |
1702 | /* Get mapping block */ | |
1703 | dmap_mblk = dmz_get_mblock(zmd, i + 1); | |
1704 | if (IS_ERR(dmap_mblk)) | |
1705 | return PTR_ERR(dmap_mblk); | |
1706 | zmd->map_mblk[i] = dmap_mblk; | |
26cb62a2 | 1707 | dmap = dmap_mblk->data; |
3b1a94c8 DLM |
1708 | i++; |
1709 | e = 0; | |
1710 | } | |
1711 | ||
1712 | /* Check data zone */ | |
1713 | dzone_id = le32_to_cpu(dmap[e].dzone_id); | |
1714 | if (dzone_id == DMZ_MAP_UNMAPPED) | |
1715 | goto next; | |
1716 | ||
36820560 | 1717 | if (dzone_id >= zmd->nr_zones) { |
ca1a7045 | 1718 | dmz_zmd_err(zmd, "Chunk %u mapping: invalid data zone ID %u", |
3b1a94c8 DLM |
1719 | chunk, dzone_id); |
1720 | return -EIO; | |
1721 | } | |
1722 | ||
1723 | dzone = dmz_get(zmd, dzone_id); | |
a92fbc44 HR |
1724 | if (!dzone) { |
1725 | dmz_zmd_err(zmd, "Chunk %u mapping: data zone %u not present", | |
1726 | chunk, dzone_id); | |
1727 | return -EIO; | |
1728 | } | |
3b1a94c8 DLM |
1729 | set_bit(DMZ_DATA, &dzone->flags); |
1730 | dzone->chunk = chunk; | |
1731 | dmz_get_zone_weight(zmd, dzone); | |
1732 | ||
34f5affd HR |
1733 | if (dmz_is_cache(dzone)) |
1734 | list_add_tail(&dzone->link, &zmd->map_cache_list); | |
1735 | else if (dmz_is_rnd(dzone)) | |
bd82fdab | 1736 | list_add_tail(&dzone->link, &dzone->dev->map_rnd_list); |
3b1a94c8 | 1737 | else |
bd82fdab | 1738 | list_add_tail(&dzone->link, &dzone->dev->map_seq_list); |
3b1a94c8 DLM |
1739 | |
1740 | /* Check buffer zone */ | |
1741 | bzone_id = le32_to_cpu(dmap[e].bzone_id); | |
1742 | if (bzone_id == DMZ_MAP_UNMAPPED) | |
1743 | goto next; | |
1744 | ||
36820560 | 1745 | if (bzone_id >= zmd->nr_zones) { |
ca1a7045 | 1746 | dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone ID %u", |
3b1a94c8 DLM |
1747 | chunk, bzone_id); |
1748 | return -EIO; | |
1749 | } | |
1750 | ||
1751 | bzone = dmz_get(zmd, bzone_id); | |
a92fbc44 HR |
1752 | if (!bzone) { |
1753 | dmz_zmd_err(zmd, "Chunk %u mapping: buffer zone %u not present", | |
1754 | chunk, bzone_id); | |
1755 | return -EIO; | |
1756 | } | |
34f5affd | 1757 | if (!dmz_is_rnd(bzone) && !dmz_is_cache(bzone)) { |
ca1a7045 | 1758 | dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone %u", |
3b1a94c8 DLM |
1759 | chunk, bzone_id); |
1760 | return -EIO; | |
1761 | } | |
1762 | ||
1763 | set_bit(DMZ_DATA, &bzone->flags); | |
1764 | set_bit(DMZ_BUF, &bzone->flags); | |
1765 | bzone->chunk = chunk; | |
1766 | bzone->bzone = dzone; | |
1767 | dzone->bzone = bzone; | |
1768 | dmz_get_zone_weight(zmd, bzone); | |
34f5affd HR |
1769 | if (dmz_is_cache(bzone)) |
1770 | list_add_tail(&bzone->link, &zmd->map_cache_list); | |
1771 | else | |
bd82fdab | 1772 | list_add_tail(&bzone->link, &bzone->dev->map_rnd_list); |
3b1a94c8 DLM |
1773 | next: |
1774 | chunk++; | |
1775 | e++; | |
1776 | if (e >= DMZ_MAP_ENTRIES) | |
1777 | dmap_mblk = NULL; | |
1778 | } | |
1779 | ||
1780 | /* | |
1781 | * At this point, only meta zones and mapped data zones were | |
1782 | * fully initialized. All remaining zones are unmapped data | |
1783 | * zones. Finish initializing those here. | |
1784 | */ | |
36820560 | 1785 | for (i = 0; i < zmd->nr_zones; i++) { |
3b1a94c8 | 1786 | dzone = dmz_get(zmd, i); |
a92fbc44 HR |
1787 | if (!dzone) |
1788 | continue; | |
3b1a94c8 DLM |
1789 | if (dmz_is_meta(dzone)) |
1790 | continue; | |
34f5affd HR |
1791 | if (dmz_is_offline(dzone)) |
1792 | continue; | |
3b1a94c8 | 1793 | |
34f5affd HR |
1794 | if (dmz_is_cache(dzone)) |
1795 | zmd->nr_cache++; | |
1796 | else if (dmz_is_rnd(dzone)) | |
bd82fdab | 1797 | dzone->dev->nr_rnd++; |
3b1a94c8 | 1798 | else |
bd82fdab | 1799 | dzone->dev->nr_seq++; |
3b1a94c8 DLM |
1800 | |
1801 | if (dmz_is_data(dzone)) { | |
1802 | /* Already initialized */ | |
1803 | continue; | |
1804 | } | |
1805 | ||
1806 | /* Unmapped data zone */ | |
1807 | set_bit(DMZ_DATA, &dzone->flags); | |
1808 | dzone->chunk = DMZ_MAP_UNMAPPED; | |
34f5affd HR |
1809 | if (dmz_is_cache(dzone)) { |
1810 | list_add_tail(&dzone->link, &zmd->unmap_cache_list); | |
1811 | atomic_inc(&zmd->unmap_nr_cache); | |
1812 | } else if (dmz_is_rnd(dzone)) { | |
bd82fdab HR |
1813 | list_add_tail(&dzone->link, |
1814 | &dzone->dev->unmap_rnd_list); | |
1815 | atomic_inc(&dzone->dev->unmap_nr_rnd); | |
3b1a94c8 DLM |
1816 | } else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) { |
1817 | list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list); | |
aec67b4f | 1818 | set_bit(DMZ_RESERVED, &dzone->flags); |
3b1a94c8 | 1819 | atomic_inc(&zmd->nr_reserved_seq_zones); |
bd82fdab | 1820 | dzone->dev->nr_seq--; |
3b1a94c8 | 1821 | } else { |
bd82fdab HR |
1822 | list_add_tail(&dzone->link, |
1823 | &dzone->dev->unmap_seq_list); | |
1824 | atomic_inc(&dzone->dev->unmap_nr_seq); | |
3b1a94c8 DLM |
1825 | } |
1826 | } | |
1827 | ||
1828 | return 0; | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Set a data chunk mapping. | |
1833 | */ | |
1834 | static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, | |
1835 | unsigned int dzone_id, unsigned int bzone_id) | |
1836 | { | |
1837 | struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; | |
26cb62a2 | 1838 | struct dmz_map *dmap = dmap_mblk->data; |
3b1a94c8 DLM |
1839 | int map_idx = chunk & DMZ_MAP_ENTRIES_MASK; |
1840 | ||
1841 | dmap[map_idx].dzone_id = cpu_to_le32(dzone_id); | |
1842 | dmap[map_idx].bzone_id = cpu_to_le32(bzone_id); | |
1843 | dmz_dirty_mblock(zmd, dmap_mblk); | |
1844 | } | |
1845 | ||
1846 | /* | |
1847 | * The list of mapped zones is maintained in LRU order. | |
1848 | * This rotates a zone at the end of its map list. | |
1849 | */ | |
1850 | static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1851 | { | |
1852 | if (list_empty(&zone->link)) | |
1853 | return; | |
1854 | ||
1855 | list_del_init(&zone->link); | |
1856 | if (dmz_is_seq(zone)) { | |
1857 | /* LRU rotate sequential zone */ | |
bd82fdab | 1858 | list_add_tail(&zone->link, &zone->dev->map_seq_list); |
34f5affd HR |
1859 | } else if (dmz_is_cache(zone)) { |
1860 | /* LRU rotate cache zone */ | |
1861 | list_add_tail(&zone->link, &zmd->map_cache_list); | |
3b1a94c8 DLM |
1862 | } else { |
1863 | /* LRU rotate random zone */ | |
bd82fdab | 1864 | list_add_tail(&zone->link, &zone->dev->map_rnd_list); |
3b1a94c8 DLM |
1865 | } |
1866 | } | |
1867 | ||
1868 | /* | |
1869 | * The list of mapped random zones is maintained | |
1870 | * in LRU order. This rotates a zone at the end of the list. | |
1871 | */ | |
1872 | static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1873 | { | |
1874 | __dmz_lru_zone(zmd, zone); | |
1875 | if (zone->bzone) | |
1876 | __dmz_lru_zone(zmd, zone->bzone); | |
1877 | } | |
1878 | ||
1879 | /* | |
1880 | * Wait for any zone to be freed. | |
1881 | */ | |
1882 | static void dmz_wait_for_free_zones(struct dmz_metadata *zmd) | |
1883 | { | |
1884 | DEFINE_WAIT(wait); | |
1885 | ||
1886 | prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE); | |
1887 | dmz_unlock_map(zmd); | |
1888 | dmz_unlock_metadata(zmd); | |
1889 | ||
1890 | io_schedule_timeout(HZ); | |
1891 | ||
1892 | dmz_lock_metadata(zmd); | |
1893 | dmz_lock_map(zmd); | |
1894 | finish_wait(&zmd->free_wq, &wait); | |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | * Lock a zone for reclaim (set the zone RECLAIM bit). | |
1899 | * Returns false if the zone cannot be locked or if it is already locked | |
1900 | * and 1 otherwise. | |
1901 | */ | |
1902 | int dmz_lock_zone_reclaim(struct dm_zone *zone) | |
1903 | { | |
1904 | /* Active zones cannot be reclaimed */ | |
1905 | if (dmz_is_active(zone)) | |
1906 | return 0; | |
1907 | ||
1908 | return !test_and_set_bit(DMZ_RECLAIM, &zone->flags); | |
1909 | } | |
1910 | ||
1911 | /* | |
1912 | * Clear a zone reclaim flag. | |
1913 | */ | |
1914 | void dmz_unlock_zone_reclaim(struct dm_zone *zone) | |
1915 | { | |
1916 | WARN_ON(dmz_is_active(zone)); | |
1917 | WARN_ON(!dmz_in_reclaim(zone)); | |
1918 | ||
1919 | clear_bit_unlock(DMZ_RECLAIM, &zone->flags); | |
1920 | smp_mb__after_atomic(); | |
1921 | wake_up_bit(&zone->flags, DMZ_RECLAIM); | |
1922 | } | |
1923 | ||
1924 | /* | |
1925 | * Wait for a zone reclaim to complete. | |
1926 | */ | |
1927 | static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone) | |
1928 | { | |
1929 | dmz_unlock_map(zmd); | |
1930 | dmz_unlock_metadata(zmd); | |
a16b7dee | 1931 | set_bit(DMZ_RECLAIM_TERMINATE, &zone->flags); |
3b1a94c8 | 1932 | wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ); |
a16b7dee | 1933 | clear_bit(DMZ_RECLAIM_TERMINATE, &zone->flags); |
3b1a94c8 DLM |
1934 | dmz_lock_metadata(zmd); |
1935 | dmz_lock_map(zmd); | |
1936 | } | |
1937 | ||
1938 | /* | |
34f5affd | 1939 | * Select a cache or random write zone for reclaim. |
3b1a94c8 | 1940 | */ |
90a9b869 | 1941 | static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd, |
69875d44 | 1942 | unsigned int idx, bool idle) |
3b1a94c8 DLM |
1943 | { |
1944 | struct dm_zone *dzone = NULL; | |
3ee39573 | 1945 | struct dm_zone *zone, *maxw_z = NULL; |
bd82fdab | 1946 | struct list_head *zone_list; |
3b1a94c8 | 1947 | |
34f5affd | 1948 | /* If we have cache zones select from the cache zone list */ |
90a9b869 | 1949 | if (zmd->nr_cache) { |
34f5affd | 1950 | zone_list = &zmd->map_cache_list; |
90a9b869 | 1951 | /* Try to relaim random zones, too, when idle */ |
69875d44 HR |
1952 | if (idle && list_empty(zone_list)) |
1953 | zone_list = &zmd->dev[idx].map_rnd_list; | |
1954 | } else | |
1955 | zone_list = &zmd->dev[idx].map_rnd_list; | |
3b1a94c8 | 1956 | |
3ee39573 DLM |
1957 | /* |
1958 | * Find the buffer zone with the heaviest weight or the first (oldest) | |
1959 | * data zone that can be reclaimed. | |
1960 | */ | |
34f5affd | 1961 | list_for_each_entry(zone, zone_list, link) { |
69875d44 | 1962 | if (dmz_is_buf(zone)) { |
3b1a94c8 | 1963 | dzone = zone->bzone; |
3ee39573 | 1964 | if (dmz_is_rnd(dzone) && dzone->dev->dev_idx != idx) |
69875d44 | 1965 | continue; |
3ee39573 DLM |
1966 | if (!maxw_z || maxw_z->weight < dzone->weight) |
1967 | maxw_z = dzone; | |
1968 | } else { | |
1969 | dzone = zone; | |
1970 | if (dmz_lock_zone_reclaim(dzone)) | |
1971 | return dzone; | |
1972 | } | |
1973 | } | |
1974 | ||
1975 | if (maxw_z && dmz_lock_zone_reclaim(maxw_z)) | |
1976 | return maxw_z; | |
1977 | ||
1978 | /* | |
1979 | * If we come here, none of the zones inspected could be locked for | |
1980 | * reclaim. Try again, being more aggressive, that is, find the | |
1981 | * first zone that can be reclaimed regardless of its weitght. | |
1982 | */ | |
1983 | list_for_each_entry(zone, zone_list, link) { | |
1984 | if (dmz_is_buf(zone)) { | |
1985 | dzone = zone->bzone; | |
1986 | if (dmz_is_rnd(dzone) && dzone->dev->dev_idx != idx) | |
2094045f | 1987 | continue; |
69875d44 | 1988 | } else |
3b1a94c8 DLM |
1989 | dzone = zone; |
1990 | if (dmz_lock_zone_reclaim(dzone)) | |
1991 | return dzone; | |
1992 | } | |
1993 | ||
489dc0f0 | 1994 | return NULL; |
3b1a94c8 DLM |
1995 | } |
1996 | ||
1997 | /* | |
1998 | * Select a buffered sequential zone for reclaim. | |
1999 | */ | |
69875d44 HR |
2000 | static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd, |
2001 | unsigned int idx) | |
3b1a94c8 DLM |
2002 | { |
2003 | struct dm_zone *zone; | |
2004 | ||
69875d44 | 2005 | list_for_each_entry(zone, &zmd->dev[idx].map_seq_list, link) { |
3b1a94c8 DLM |
2006 | if (!zone->bzone) |
2007 | continue; | |
2008 | if (dmz_lock_zone_reclaim(zone)) | |
2009 | return zone; | |
2010 | } | |
2011 | ||
489dc0f0 | 2012 | return NULL; |
3b1a94c8 DLM |
2013 | } |
2014 | ||
2015 | /* | |
2016 | * Select a zone for reclaim. | |
2017 | */ | |
69875d44 HR |
2018 | struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd, |
2019 | unsigned int dev_idx, bool idle) | |
3b1a94c8 | 2020 | { |
f2cd9a5e | 2021 | struct dm_zone *zone = NULL; |
3b1a94c8 DLM |
2022 | |
2023 | /* | |
2024 | * Search for a zone candidate to reclaim: 2 cases are possible. | |
2025 | * (1) There is no free sequential zones. Then a random data zone | |
2026 | * cannot be reclaimed. So choose a sequential zone to reclaim so | |
2027 | * that afterward a random zone can be reclaimed. | |
2028 | * (2) At least one free sequential zone is available, then choose | |
2029 | * the oldest random zone (data or buffer) that can be locked. | |
2030 | */ | |
2031 | dmz_lock_map(zmd); | |
2032 | if (list_empty(&zmd->reserved_seq_zones_list)) | |
69875d44 | 2033 | zone = dmz_get_seq_zone_for_reclaim(zmd, dev_idx); |
f2cd9a5e | 2034 | if (!zone) |
69875d44 | 2035 | zone = dmz_get_rnd_zone_for_reclaim(zmd, dev_idx, idle); |
3b1a94c8 DLM |
2036 | dmz_unlock_map(zmd); |
2037 | ||
2038 | return zone; | |
2039 | } | |
2040 | ||
3b1a94c8 DLM |
2041 | /* |
2042 | * Get the zone mapping a chunk, if the chunk is mapped already. | |
2043 | * If no mapping exist and the operation is WRITE, a zone is | |
2044 | * allocated and used to map the chunk. | |
2045 | * The zone returned will be set to the active state. | |
2046 | */ | |
13a1f650 BVA |
2047 | struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, |
2048 | unsigned int chunk, enum req_op op) | |
3b1a94c8 DLM |
2049 | { |
2050 | struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; | |
26cb62a2 | 2051 | struct dmz_map *dmap = dmap_mblk->data; |
3b1a94c8 DLM |
2052 | int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK; |
2053 | unsigned int dzone_id; | |
2054 | struct dm_zone *dzone = NULL; | |
2055 | int ret = 0; | |
34f5affd | 2056 | int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND; |
3b1a94c8 DLM |
2057 | |
2058 | dmz_lock_map(zmd); | |
2059 | again: | |
2060 | /* Get the chunk mapping */ | |
2061 | dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id); | |
2062 | if (dzone_id == DMZ_MAP_UNMAPPED) { | |
2063 | /* | |
2064 | * Read or discard in unmapped chunks are fine. But for | |
2065 | * writes, we need a mapping, so get one. | |
2066 | */ | |
2067 | if (op != REQ_OP_WRITE) | |
2068 | goto out; | |
2069 | ||
ad1bd578 | 2070 | /* Allocate a random zone */ |
22c1ef66 | 2071 | dzone = dmz_alloc_zone(zmd, 0, alloc_flags); |
3b1a94c8 | 2072 | if (!dzone) { |
d0e21ce4 | 2073 | if (dmz_dev_is_dying(zmd)) { |
75d66ffb DF |
2074 | dzone = ERR_PTR(-EIO); |
2075 | goto out; | |
2076 | } | |
3b1a94c8 DLM |
2077 | dmz_wait_for_free_zones(zmd); |
2078 | goto again; | |
2079 | } | |
2080 | ||
2081 | dmz_map_zone(zmd, dzone, chunk); | |
2082 | ||
2083 | } else { | |
2084 | /* The chunk is already mapped: get the mapping zone */ | |
2085 | dzone = dmz_get(zmd, dzone_id); | |
a92fbc44 HR |
2086 | if (!dzone) { |
2087 | dzone = ERR_PTR(-EIO); | |
2088 | goto out; | |
2089 | } | |
3b1a94c8 DLM |
2090 | if (dzone->chunk != chunk) { |
2091 | dzone = ERR_PTR(-EIO); | |
2092 | goto out; | |
2093 | } | |
2094 | ||
2095 | /* Repair write pointer if the sequential dzone has error */ | |
2096 | if (dmz_seq_write_err(dzone)) { | |
2097 | ret = dmz_handle_seq_write_err(zmd, dzone); | |
2098 | if (ret) { | |
2099 | dzone = ERR_PTR(-EIO); | |
2100 | goto out; | |
2101 | } | |
2102 | clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags); | |
2103 | } | |
2104 | } | |
2105 | ||
2106 | /* | |
2107 | * If the zone is being reclaimed, the chunk mapping may change | |
2108 | * to a different zone. So wait for reclaim and retry. Otherwise, | |
2109 | * activate the zone (this will prevent reclaim from touching it). | |
2110 | */ | |
2111 | if (dmz_in_reclaim(dzone)) { | |
2112 | dmz_wait_for_reclaim(zmd, dzone); | |
2113 | goto again; | |
2114 | } | |
2115 | dmz_activate_zone(dzone); | |
2116 | dmz_lru_zone(zmd, dzone); | |
2117 | out: | |
2118 | dmz_unlock_map(zmd); | |
2119 | ||
2120 | return dzone; | |
2121 | } | |
2122 | ||
2123 | /* | |
2124 | * Write and discard change the block validity of data zones and their buffer | |
2125 | * zones. Check here that valid blocks are still present. If all blocks are | |
2126 | * invalid, the zones can be unmapped on the fly without waiting for reclaim | |
2127 | * to do it. | |
2128 | */ | |
2129 | void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone) | |
2130 | { | |
2131 | struct dm_zone *bzone; | |
2132 | ||
2133 | dmz_lock_map(zmd); | |
2134 | ||
2135 | bzone = dzone->bzone; | |
2136 | if (bzone) { | |
2137 | if (dmz_weight(bzone)) | |
2138 | dmz_lru_zone(zmd, bzone); | |
2139 | else { | |
2140 | /* Empty buffer zone: reclaim it */ | |
2141 | dmz_unmap_zone(zmd, bzone); | |
2142 | dmz_free_zone(zmd, bzone); | |
2143 | bzone = NULL; | |
2144 | } | |
2145 | } | |
2146 | ||
2147 | /* Deactivate the data zone */ | |
2148 | dmz_deactivate_zone(dzone); | |
2149 | if (dmz_is_active(dzone) || bzone || dmz_weight(dzone)) | |
2150 | dmz_lru_zone(zmd, dzone); | |
2151 | else { | |
2152 | /* Unbuffered inactive empty data zone: reclaim it */ | |
2153 | dmz_unmap_zone(zmd, dzone); | |
2154 | dmz_free_zone(zmd, dzone); | |
2155 | } | |
2156 | ||
2157 | dmz_unlock_map(zmd); | |
2158 | } | |
2159 | ||
2160 | /* | |
2161 | * Allocate and map a random zone to buffer a chunk | |
2162 | * already mapped to a sequential zone. | |
2163 | */ | |
2164 | struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd, | |
2165 | struct dm_zone *dzone) | |
2166 | { | |
2167 | struct dm_zone *bzone; | |
34f5affd | 2168 | int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND; |
3b1a94c8 DLM |
2169 | |
2170 | dmz_lock_map(zmd); | |
2171 | again: | |
2172 | bzone = dzone->bzone; | |
2173 | if (bzone) | |
2174 | goto out; | |
2175 | ||
ad1bd578 | 2176 | /* Allocate a random zone */ |
22c1ef66 | 2177 | bzone = dmz_alloc_zone(zmd, 0, alloc_flags); |
3b1a94c8 | 2178 | if (!bzone) { |
d0e21ce4 | 2179 | if (dmz_dev_is_dying(zmd)) { |
75d66ffb DF |
2180 | bzone = ERR_PTR(-EIO); |
2181 | goto out; | |
2182 | } | |
3b1a94c8 DLM |
2183 | dmz_wait_for_free_zones(zmd); |
2184 | goto again; | |
2185 | } | |
2186 | ||
2187 | /* Update the chunk mapping */ | |
b7122873 | 2188 | dmz_set_chunk_mapping(zmd, dzone->chunk, dzone->id, bzone->id); |
3b1a94c8 DLM |
2189 | |
2190 | set_bit(DMZ_BUF, &bzone->flags); | |
2191 | bzone->chunk = dzone->chunk; | |
2192 | bzone->bzone = dzone; | |
2193 | dzone->bzone = bzone; | |
34f5affd HR |
2194 | if (dmz_is_cache(bzone)) |
2195 | list_add_tail(&bzone->link, &zmd->map_cache_list); | |
2196 | else | |
bd82fdab | 2197 | list_add_tail(&bzone->link, &bzone->dev->map_rnd_list); |
3b1a94c8 DLM |
2198 | out: |
2199 | dmz_unlock_map(zmd); | |
2200 | ||
2201 | return bzone; | |
2202 | } | |
2203 | ||
2204 | /* | |
2205 | * Get an unmapped (free) zone. | |
2206 | * This must be called with the mapping lock held. | |
2207 | */ | |
22c1ef66 HR |
2208 | struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned int dev_idx, |
2209 | unsigned long flags) | |
3b1a94c8 DLM |
2210 | { |
2211 | struct list_head *list; | |
2212 | struct dm_zone *zone; | |
174364f6 DLM |
2213 | int i; |
2214 | ||
2215 | /* Schedule reclaim to ensure free zones are available */ | |
2216 | if (!(flags & DMZ_ALLOC_RECLAIM)) { | |
2217 | for (i = 0; i < zmd->nr_devs; i++) | |
2218 | dmz_schedule_reclaim(zmd->dev[i].reclaim); | |
2219 | } | |
3b1a94c8 | 2220 | |
174364f6 | 2221 | i = 0; |
3b1a94c8 | 2222 | again: |
34f5affd HR |
2223 | if (flags & DMZ_ALLOC_CACHE) |
2224 | list = &zmd->unmap_cache_list; | |
2225 | else if (flags & DMZ_ALLOC_RND) | |
bd82fdab | 2226 | list = &zmd->dev[dev_idx].unmap_rnd_list; |
3b1a94c8 | 2227 | else |
bd82fdab | 2228 | list = &zmd->dev[dev_idx].unmap_seq_list; |
34f5affd | 2229 | |
3b1a94c8 DLM |
2230 | if (list_empty(list)) { |
2231 | /* | |
34f5affd | 2232 | * No free zone: return NULL if this is for not reclaim. |
3b1a94c8 | 2233 | */ |
34f5affd | 2234 | if (!(flags & DMZ_ALLOC_RECLAIM)) |
3b1a94c8 | 2235 | return NULL; |
22c1ef66 HR |
2236 | /* |
2237 | * Try to allocate from other devices | |
2238 | */ | |
2239 | if (i < zmd->nr_devs) { | |
2240 | dev_idx = (dev_idx + 1) % zmd->nr_devs; | |
2241 | i++; | |
bd82fdab HR |
2242 | goto again; |
2243 | } | |
3b1a94c8 | 2244 | |
34f5affd HR |
2245 | /* |
2246 | * Fallback to the reserved sequential zones | |
2247 | */ | |
2248 | zone = list_first_entry_or_null(&zmd->reserved_seq_zones_list, | |
2249 | struct dm_zone, link); | |
2250 | if (zone) { | |
2251 | list_del_init(&zone->link); | |
2252 | atomic_dec(&zmd->nr_reserved_seq_zones); | |
2253 | } | |
3b1a94c8 DLM |
2254 | return zone; |
2255 | } | |
2256 | ||
2257 | zone = list_first_entry(list, struct dm_zone, link); | |
2258 | list_del_init(&zone->link); | |
2259 | ||
34f5affd HR |
2260 | if (dmz_is_cache(zone)) |
2261 | atomic_dec(&zmd->unmap_nr_cache); | |
2262 | else if (dmz_is_rnd(zone)) | |
bd82fdab | 2263 | atomic_dec(&zone->dev->unmap_nr_rnd); |
3b1a94c8 | 2264 | else |
bd82fdab | 2265 | atomic_dec(&zone->dev->unmap_nr_seq); |
3b1a94c8 DLM |
2266 | |
2267 | if (dmz_is_offline(zone)) { | |
ca1a7045 | 2268 | dmz_zmd_warn(zmd, "Zone %u is offline", zone->id); |
3b1a94c8 DLM |
2269 | zone = NULL; |
2270 | goto again; | |
2271 | } | |
dc076c83 | 2272 | if (dmz_is_meta(zone)) { |
8f22272a | 2273 | dmz_zmd_warn(zmd, "Zone %u has metadata", zone->id); |
3b1a94c8 DLM |
2274 | zone = NULL; |
2275 | goto again; | |
2276 | } | |
3b1a94c8 DLM |
2277 | return zone; |
2278 | } | |
2279 | ||
2280 | /* | |
2281 | * Free a zone. | |
2282 | * This must be called with the mapping lock held. | |
2283 | */ | |
2284 | void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
2285 | { | |
2286 | /* If this is a sequential zone, reset it */ | |
2287 | if (dmz_is_seq(zone)) | |
2288 | dmz_reset_zone(zmd, zone); | |
2289 | ||
2290 | /* Return the zone to its type unmap list */ | |
34f5affd HR |
2291 | if (dmz_is_cache(zone)) { |
2292 | list_add_tail(&zone->link, &zmd->unmap_cache_list); | |
2293 | atomic_inc(&zmd->unmap_nr_cache); | |
2294 | } else if (dmz_is_rnd(zone)) { | |
bd82fdab HR |
2295 | list_add_tail(&zone->link, &zone->dev->unmap_rnd_list); |
2296 | atomic_inc(&zone->dev->unmap_nr_rnd); | |
aec67b4f | 2297 | } else if (dmz_is_reserved(zone)) { |
3b1a94c8 DLM |
2298 | list_add_tail(&zone->link, &zmd->reserved_seq_zones_list); |
2299 | atomic_inc(&zmd->nr_reserved_seq_zones); | |
2300 | } else { | |
bd82fdab HR |
2301 | list_add_tail(&zone->link, &zone->dev->unmap_seq_list); |
2302 | atomic_inc(&zone->dev->unmap_nr_seq); | |
3b1a94c8 DLM |
2303 | } |
2304 | ||
2305 | wake_up_all(&zmd->free_wq); | |
2306 | } | |
2307 | ||
2308 | /* | |
2309 | * Map a chunk to a zone. | |
2310 | * This must be called with the mapping lock held. | |
2311 | */ | |
2312 | void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone, | |
2313 | unsigned int chunk) | |
2314 | { | |
2315 | /* Set the chunk mapping */ | |
b7122873 | 2316 | dmz_set_chunk_mapping(zmd, chunk, dzone->id, |
3b1a94c8 DLM |
2317 | DMZ_MAP_UNMAPPED); |
2318 | dzone->chunk = chunk; | |
34f5affd HR |
2319 | if (dmz_is_cache(dzone)) |
2320 | list_add_tail(&dzone->link, &zmd->map_cache_list); | |
2321 | else if (dmz_is_rnd(dzone)) | |
bd82fdab | 2322 | list_add_tail(&dzone->link, &dzone->dev->map_rnd_list); |
3b1a94c8 | 2323 | else |
bd82fdab | 2324 | list_add_tail(&dzone->link, &dzone->dev->map_seq_list); |
3b1a94c8 DLM |
2325 | } |
2326 | ||
2327 | /* | |
2328 | * Unmap a zone. | |
2329 | * This must be called with the mapping lock held. | |
2330 | */ | |
2331 | void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone) | |
2332 | { | |
2333 | unsigned int chunk = zone->chunk; | |
2334 | unsigned int dzone_id; | |
2335 | ||
2336 | if (chunk == DMZ_MAP_UNMAPPED) { | |
2337 | /* Already unmapped */ | |
2338 | return; | |
2339 | } | |
2340 | ||
2341 | if (test_and_clear_bit(DMZ_BUF, &zone->flags)) { | |
2342 | /* | |
2343 | * Unmapping the chunk buffer zone: clear only | |
2344 | * the chunk buffer mapping | |
2345 | */ | |
b7122873 | 2346 | dzone_id = zone->bzone->id; |
3b1a94c8 DLM |
2347 | zone->bzone->bzone = NULL; |
2348 | zone->bzone = NULL; | |
2349 | ||
2350 | } else { | |
2351 | /* | |
2352 | * Unmapping the chunk data zone: the zone must | |
2353 | * not be buffered. | |
2354 | */ | |
2355 | if (WARN_ON(zone->bzone)) { | |
2356 | zone->bzone->bzone = NULL; | |
2357 | zone->bzone = NULL; | |
2358 | } | |
2359 | dzone_id = DMZ_MAP_UNMAPPED; | |
2360 | } | |
2361 | ||
2362 | dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED); | |
2363 | ||
2364 | zone->chunk = DMZ_MAP_UNMAPPED; | |
2365 | list_del_init(&zone->link); | |
2366 | } | |
2367 | ||
2368 | /* | |
2369 | * Set @nr_bits bits in @bitmap starting from @bit. | |
2370 | * Return the number of bits changed from 0 to 1. | |
2371 | */ | |
2372 | static unsigned int dmz_set_bits(unsigned long *bitmap, | |
2373 | unsigned int bit, unsigned int nr_bits) | |
2374 | { | |
2375 | unsigned long *addr; | |
2376 | unsigned int end = bit + nr_bits; | |
2377 | unsigned int n = 0; | |
2378 | ||
2379 | while (bit < end) { | |
2380 | if (((bit & (BITS_PER_LONG - 1)) == 0) && | |
2381 | ((end - bit) >= BITS_PER_LONG)) { | |
2382 | /* Try to set the whole word at once */ | |
2383 | addr = bitmap + BIT_WORD(bit); | |
2384 | if (*addr == 0) { | |
2385 | *addr = ULONG_MAX; | |
2386 | n += BITS_PER_LONG; | |
2387 | bit += BITS_PER_LONG; | |
2388 | continue; | |
2389 | } | |
2390 | } | |
2391 | ||
2392 | if (!test_and_set_bit(bit, bitmap)) | |
2393 | n++; | |
2394 | bit++; | |
2395 | } | |
2396 | ||
2397 | return n; | |
2398 | } | |
2399 | ||
2400 | /* | |
2401 | * Get the bitmap block storing the bit for chunk_block in zone. | |
2402 | */ | |
2403 | static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd, | |
2404 | struct dm_zone *zone, | |
2405 | sector_t chunk_block) | |
2406 | { | |
2407 | sector_t bitmap_block = 1 + zmd->nr_map_blocks + | |
b7122873 | 2408 | (sector_t)(zone->id * zmd->zone_nr_bitmap_blocks) + |
3b1a94c8 DLM |
2409 | (chunk_block >> DMZ_BLOCK_SHIFT_BITS); |
2410 | ||
2411 | return dmz_get_mblock(zmd, bitmap_block); | |
2412 | } | |
2413 | ||
2414 | /* | |
2415 | * Copy the valid blocks bitmap of from_zone to the bitmap of to_zone. | |
2416 | */ | |
2417 | int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, | |
2418 | struct dm_zone *to_zone) | |
2419 | { | |
2420 | struct dmz_mblock *from_mblk, *to_mblk; | |
2421 | sector_t chunk_block = 0; | |
2422 | ||
2423 | /* Get the zones bitmap blocks */ | |
36820560 | 2424 | while (chunk_block < zmd->zone_nr_blocks) { |
3b1a94c8 DLM |
2425 | from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block); |
2426 | if (IS_ERR(from_mblk)) | |
2427 | return PTR_ERR(from_mblk); | |
2428 | to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block); | |
2429 | if (IS_ERR(to_mblk)) { | |
2430 | dmz_release_mblock(zmd, from_mblk); | |
2431 | return PTR_ERR(to_mblk); | |
2432 | } | |
2433 | ||
2434 | memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE); | |
2435 | dmz_dirty_mblock(zmd, to_mblk); | |
2436 | ||
2437 | dmz_release_mblock(zmd, to_mblk); | |
2438 | dmz_release_mblock(zmd, from_mblk); | |
2439 | ||
b3996295 | 2440 | chunk_block += zmd->zone_bits_per_mblk; |
3b1a94c8 DLM |
2441 | } |
2442 | ||
2443 | to_zone->weight = from_zone->weight; | |
2444 | ||
2445 | return 0; | |
2446 | } | |
2447 | ||
2448 | /* | |
2449 | * Merge the valid blocks bitmap of from_zone into the bitmap of to_zone, | |
2450 | * starting from chunk_block. | |
2451 | */ | |
2452 | int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, | |
2453 | struct dm_zone *to_zone, sector_t chunk_block) | |
2454 | { | |
2455 | unsigned int nr_blocks; | |
2456 | int ret; | |
2457 | ||
2458 | /* Get the zones bitmap blocks */ | |
36820560 | 2459 | while (chunk_block < zmd->zone_nr_blocks) { |
3b1a94c8 DLM |
2460 | /* Get a valid region from the source zone */ |
2461 | ret = dmz_first_valid_block(zmd, from_zone, &chunk_block); | |
2462 | if (ret <= 0) | |
2463 | return ret; | |
2464 | ||
2465 | nr_blocks = ret; | |
2466 | ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks); | |
2467 | if (ret) | |
2468 | return ret; | |
2469 | ||
2470 | chunk_block += nr_blocks; | |
2471 | } | |
2472 | ||
2473 | return 0; | |
2474 | } | |
2475 | ||
2476 | /* | |
2477 | * Validate all the blocks in the range [block..block+nr_blocks-1]. | |
2478 | */ | |
2479 | int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2480 | sector_t chunk_block, unsigned int nr_blocks) | |
2481 | { | |
2482 | unsigned int count, bit, nr_bits; | |
36820560 | 2483 | unsigned int zone_nr_blocks = zmd->zone_nr_blocks; |
3b1a94c8 DLM |
2484 | struct dmz_mblock *mblk; |
2485 | unsigned int n = 0; | |
2486 | ||
ca1a7045 | 2487 | dmz_zmd_debug(zmd, "=> VALIDATE zone %u, block %llu, %u blocks", |
b7122873 | 2488 | zone->id, (unsigned long long)chunk_block, |
3b1a94c8 DLM |
2489 | nr_blocks); |
2490 | ||
2491 | WARN_ON(chunk_block + nr_blocks > zone_nr_blocks); | |
2492 | ||
2493 | while (nr_blocks) { | |
2494 | /* Get bitmap block */ | |
2495 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2496 | if (IS_ERR(mblk)) | |
2497 | return PTR_ERR(mblk); | |
2498 | ||
2499 | /* Set bits */ | |
2500 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
b3996295 | 2501 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
3b1a94c8 DLM |
2502 | |
2503 | count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits); | |
2504 | if (count) { | |
2505 | dmz_dirty_mblock(zmd, mblk); | |
2506 | n += count; | |
2507 | } | |
2508 | dmz_release_mblock(zmd, mblk); | |
2509 | ||
2510 | nr_blocks -= nr_bits; | |
2511 | chunk_block += nr_bits; | |
2512 | } | |
2513 | ||
2514 | if (likely(zone->weight + n <= zone_nr_blocks)) | |
2515 | zone->weight += n; | |
2516 | else { | |
ca1a7045 | 2517 | dmz_zmd_warn(zmd, "Zone %u: weight %u should be <= %u", |
b7122873 | 2518 | zone->id, zone->weight, |
3b1a94c8 DLM |
2519 | zone_nr_blocks - n); |
2520 | zone->weight = zone_nr_blocks; | |
2521 | } | |
2522 | ||
2523 | return 0; | |
2524 | } | |
2525 | ||
2526 | /* | |
2527 | * Clear nr_bits bits in bitmap starting from bit. | |
2528 | * Return the number of bits cleared. | |
2529 | */ | |
2530 | static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits) | |
2531 | { | |
2532 | unsigned long *addr; | |
2533 | int end = bit + nr_bits; | |
2534 | int n = 0; | |
2535 | ||
2536 | while (bit < end) { | |
2537 | if (((bit & (BITS_PER_LONG - 1)) == 0) && | |
2538 | ((end - bit) >= BITS_PER_LONG)) { | |
2539 | /* Try to clear whole word at once */ | |
2540 | addr = bitmap + BIT_WORD(bit); | |
2541 | if (*addr == ULONG_MAX) { | |
2542 | *addr = 0; | |
2543 | n += BITS_PER_LONG; | |
2544 | bit += BITS_PER_LONG; | |
2545 | continue; | |
2546 | } | |
2547 | } | |
2548 | ||
2549 | if (test_and_clear_bit(bit, bitmap)) | |
2550 | n++; | |
2551 | bit++; | |
2552 | } | |
2553 | ||
2554 | return n; | |
2555 | } | |
2556 | ||
2557 | /* | |
2558 | * Invalidate all the blocks in the range [block..block+nr_blocks-1]. | |
2559 | */ | |
2560 | int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2561 | sector_t chunk_block, unsigned int nr_blocks) | |
2562 | { | |
2563 | unsigned int count, bit, nr_bits; | |
2564 | struct dmz_mblock *mblk; | |
2565 | unsigned int n = 0; | |
2566 | ||
ca1a7045 | 2567 | dmz_zmd_debug(zmd, "=> INVALIDATE zone %u, block %llu, %u blocks", |
b7122873 | 2568 | zone->id, (u64)chunk_block, nr_blocks); |
3b1a94c8 | 2569 | |
36820560 | 2570 | WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks); |
3b1a94c8 DLM |
2571 | |
2572 | while (nr_blocks) { | |
2573 | /* Get bitmap block */ | |
2574 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2575 | if (IS_ERR(mblk)) | |
2576 | return PTR_ERR(mblk); | |
2577 | ||
2578 | /* Clear bits */ | |
2579 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
b3996295 | 2580 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
3b1a94c8 DLM |
2581 | |
2582 | count = dmz_clear_bits((unsigned long *)mblk->data, | |
2583 | bit, nr_bits); | |
2584 | if (count) { | |
2585 | dmz_dirty_mblock(zmd, mblk); | |
2586 | n += count; | |
2587 | } | |
2588 | dmz_release_mblock(zmd, mblk); | |
2589 | ||
2590 | nr_blocks -= nr_bits; | |
2591 | chunk_block += nr_bits; | |
2592 | } | |
2593 | ||
2594 | if (zone->weight >= n) | |
2595 | zone->weight -= n; | |
2596 | else { | |
ca1a7045 | 2597 | dmz_zmd_warn(zmd, "Zone %u: weight %u should be >= %u", |
b7122873 | 2598 | zone->id, zone->weight, n); |
3b1a94c8 DLM |
2599 | zone->weight = 0; |
2600 | } | |
2601 | ||
2602 | return 0; | |
2603 | } | |
2604 | ||
2605 | /* | |
2606 | * Get a block bit value. | |
2607 | */ | |
2608 | static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2609 | sector_t chunk_block) | |
2610 | { | |
2611 | struct dmz_mblock *mblk; | |
2612 | int ret; | |
2613 | ||
36820560 | 2614 | WARN_ON(chunk_block >= zmd->zone_nr_blocks); |
3b1a94c8 DLM |
2615 | |
2616 | /* Get bitmap block */ | |
2617 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2618 | if (IS_ERR(mblk)) | |
2619 | return PTR_ERR(mblk); | |
2620 | ||
2621 | /* Get offset */ | |
2622 | ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS, | |
2623 | (unsigned long *) mblk->data) != 0; | |
2624 | ||
2625 | dmz_release_mblock(zmd, mblk); | |
2626 | ||
2627 | return ret; | |
2628 | } | |
2629 | ||
2630 | /* | |
2631 | * Return the number of blocks from chunk_block to the first block with a bit | |
2632 | * value specified by set. Search at most nr_blocks blocks from chunk_block. | |
2633 | */ | |
2634 | static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2635 | sector_t chunk_block, unsigned int nr_blocks, | |
2636 | int set) | |
2637 | { | |
2638 | struct dmz_mblock *mblk; | |
2639 | unsigned int bit, set_bit, nr_bits; | |
b3996295 | 2640 | unsigned int zone_bits = zmd->zone_bits_per_mblk; |
3b1a94c8 DLM |
2641 | unsigned long *bitmap; |
2642 | int n = 0; | |
2643 | ||
36820560 | 2644 | WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks); |
3b1a94c8 DLM |
2645 | |
2646 | while (nr_blocks) { | |
2647 | /* Get bitmap block */ | |
2648 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2649 | if (IS_ERR(mblk)) | |
2650 | return PTR_ERR(mblk); | |
2651 | ||
2652 | /* Get offset */ | |
2653 | bitmap = (unsigned long *) mblk->data; | |
2654 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
b3996295 | 2655 | nr_bits = min(nr_blocks, zone_bits - bit); |
3b1a94c8 | 2656 | if (set) |
b3996295 | 2657 | set_bit = find_next_bit(bitmap, zone_bits, bit); |
3b1a94c8 | 2658 | else |
b3996295 | 2659 | set_bit = find_next_zero_bit(bitmap, zone_bits, bit); |
3b1a94c8 DLM |
2660 | dmz_release_mblock(zmd, mblk); |
2661 | ||
2662 | n += set_bit - bit; | |
b3996295 | 2663 | if (set_bit < zone_bits) |
3b1a94c8 DLM |
2664 | break; |
2665 | ||
2666 | nr_blocks -= nr_bits; | |
2667 | chunk_block += nr_bits; | |
2668 | } | |
2669 | ||
2670 | return n; | |
2671 | } | |
2672 | ||
2673 | /* | |
2674 | * Test if chunk_block is valid. If it is, the number of consecutive | |
2675 | * valid blocks from chunk_block will be returned. | |
2676 | */ | |
2677 | int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2678 | sector_t chunk_block) | |
2679 | { | |
2680 | int valid; | |
2681 | ||
2682 | valid = dmz_test_block(zmd, zone, chunk_block); | |
2683 | if (valid <= 0) | |
2684 | return valid; | |
2685 | ||
2686 | /* The block is valid: get the number of valid blocks from block */ | |
2687 | return dmz_to_next_set_block(zmd, zone, chunk_block, | |
36820560 | 2688 | zmd->zone_nr_blocks - chunk_block, 0); |
3b1a94c8 DLM |
2689 | } |
2690 | ||
2691 | /* | |
2692 | * Find the first valid block from @chunk_block in @zone. | |
2693 | * If such a block is found, its number is returned using | |
2694 | * @chunk_block and the total number of valid blocks from @chunk_block | |
2695 | * is returned. | |
2696 | */ | |
2697 | int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone, | |
2698 | sector_t *chunk_block) | |
2699 | { | |
2700 | sector_t start_block = *chunk_block; | |
2701 | int ret; | |
2702 | ||
2703 | ret = dmz_to_next_set_block(zmd, zone, start_block, | |
36820560 | 2704 | zmd->zone_nr_blocks - start_block, 1); |
3b1a94c8 DLM |
2705 | if (ret < 0) |
2706 | return ret; | |
2707 | ||
2708 | start_block += ret; | |
2709 | *chunk_block = start_block; | |
2710 | ||
2711 | return dmz_to_next_set_block(zmd, zone, start_block, | |
36820560 | 2712 | zmd->zone_nr_blocks - start_block, 0); |
3b1a94c8 DLM |
2713 | } |
2714 | ||
2715 | /* | |
2716 | * Count the number of bits set starting from bit up to bit + nr_bits - 1. | |
2717 | */ | |
2718 | static int dmz_count_bits(void *bitmap, int bit, int nr_bits) | |
2719 | { | |
2720 | unsigned long *addr; | |
2721 | int end = bit + nr_bits; | |
2722 | int n = 0; | |
2723 | ||
2724 | while (bit < end) { | |
2725 | if (((bit & (BITS_PER_LONG - 1)) == 0) && | |
2726 | ((end - bit) >= BITS_PER_LONG)) { | |
2727 | addr = (unsigned long *)bitmap + BIT_WORD(bit); | |
2728 | if (*addr == ULONG_MAX) { | |
2729 | n += BITS_PER_LONG; | |
2730 | bit += BITS_PER_LONG; | |
2731 | continue; | |
2732 | } | |
2733 | } | |
2734 | ||
2735 | if (test_bit(bit, bitmap)) | |
2736 | n++; | |
2737 | bit++; | |
2738 | } | |
2739 | ||
2740 | return n; | |
2741 | } | |
2742 | ||
2743 | /* | |
2744 | * Get a zone weight. | |
2745 | */ | |
2746 | static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone) | |
2747 | { | |
2748 | struct dmz_mblock *mblk; | |
2749 | sector_t chunk_block = 0; | |
2750 | unsigned int bit, nr_bits; | |
36820560 | 2751 | unsigned int nr_blocks = zmd->zone_nr_blocks; |
3b1a94c8 DLM |
2752 | void *bitmap; |
2753 | int n = 0; | |
2754 | ||
2755 | while (nr_blocks) { | |
2756 | /* Get bitmap block */ | |
2757 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); | |
2758 | if (IS_ERR(mblk)) { | |
2759 | n = 0; | |
2760 | break; | |
2761 | } | |
2762 | ||
2763 | /* Count bits in this block */ | |
2764 | bitmap = mblk->data; | |
2765 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; | |
b3996295 | 2766 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
3b1a94c8 DLM |
2767 | n += dmz_count_bits(bitmap, bit, nr_bits); |
2768 | ||
2769 | dmz_release_mblock(zmd, mblk); | |
2770 | ||
2771 | nr_blocks -= nr_bits; | |
2772 | chunk_block += nr_bits; | |
2773 | } | |
2774 | ||
2775 | zone->weight = n; | |
2776 | } | |
2777 | ||
2778 | /* | |
2779 | * Cleanup the zoned metadata resources. | |
2780 | */ | |
2781 | static void dmz_cleanup_metadata(struct dmz_metadata *zmd) | |
2782 | { | |
2783 | struct rb_root *root; | |
2784 | struct dmz_mblock *mblk, *next; | |
2785 | int i; | |
2786 | ||
2787 | /* Release zone mapping resources */ | |
2788 | if (zmd->map_mblk) { | |
2789 | for (i = 0; i < zmd->nr_map_blocks; i++) | |
2790 | dmz_release_mblock(zmd, zmd->map_mblk[i]); | |
2791 | kfree(zmd->map_mblk); | |
2792 | zmd->map_mblk = NULL; | |
2793 | } | |
2794 | ||
2795 | /* Release super blocks */ | |
2796 | for (i = 0; i < 2; i++) { | |
2797 | if (zmd->sb[i].mblk) { | |
2798 | dmz_free_mblock(zmd, zmd->sb[i].mblk); | |
2799 | zmd->sb[i].mblk = NULL; | |
2800 | } | |
2801 | } | |
2802 | ||
2803 | /* Free cached blocks */ | |
2804 | while (!list_empty(&zmd->mblk_dirty_list)) { | |
2805 | mblk = list_first_entry(&zmd->mblk_dirty_list, | |
2806 | struct dmz_mblock, link); | |
ca1a7045 | 2807 | dmz_zmd_warn(zmd, "mblock %llu still in dirty list (ref %u)", |
33c2865f | 2808 | (u64)mblk->no, mblk->ref); |
3b1a94c8 DLM |
2809 | list_del_init(&mblk->link); |
2810 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
2811 | dmz_free_mblock(zmd, mblk); | |
2812 | } | |
2813 | ||
2814 | while (!list_empty(&zmd->mblk_lru_list)) { | |
2815 | mblk = list_first_entry(&zmd->mblk_lru_list, | |
2816 | struct dmz_mblock, link); | |
2817 | list_del_init(&mblk->link); | |
2818 | rb_erase(&mblk->node, &zmd->mblk_rbtree); | |
2819 | dmz_free_mblock(zmd, mblk); | |
2820 | } | |
2821 | ||
2822 | /* Sanity checks: the mblock rbtree should now be empty */ | |
2823 | root = &zmd->mblk_rbtree; | |
2824 | rbtree_postorder_for_each_entry_safe(mblk, next, root, node) { | |
ca1a7045 | 2825 | dmz_zmd_warn(zmd, "mblock %llu ref %u still in rbtree", |
33c2865f DLM |
2826 | (u64)mblk->no, mblk->ref); |
2827 | mblk->ref = 0; | |
3b1a94c8 DLM |
2828 | dmz_free_mblock(zmd, mblk); |
2829 | } | |
2830 | ||
2831 | /* Free the zone descriptors */ | |
2832 | dmz_drop_zones(zmd); | |
d5ffebdd MS |
2833 | |
2834 | mutex_destroy(&zmd->mblk_flush_lock); | |
2835 | mutex_destroy(&zmd->map_lock); | |
3b1a94c8 DLM |
2836 | } |
2837 | ||
ca1a7045 HR |
2838 | static void dmz_print_dev(struct dmz_metadata *zmd, int num) |
2839 | { | |
2840 | struct dmz_dev *dev = &zmd->dev[num]; | |
2841 | ||
7437bb73 | 2842 | if (!bdev_is_zoned(dev->bdev)) |
bd5c4031 HR |
2843 | dmz_dev_info(dev, "Regular block device"); |
2844 | else | |
7437bb73 CH |
2845 | dmz_dev_info(dev, "Host-managed zoned block device"); |
2846 | ||
bd5c4031 HR |
2847 | if (zmd->sb_version > 1) { |
2848 | sector_t sector_offset = | |
2849 | dev->zone_offset << zmd->zone_nr_sectors_shift; | |
2850 | ||
2851 | dmz_dev_info(dev, " %llu 512-byte logical sectors (offset %llu)", | |
2852 | (u64)dev->capacity, (u64)sector_offset); | |
2853 | dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors (offset %llu)", | |
2854 | dev->nr_zones, (u64)zmd->zone_nr_sectors, | |
2855 | (u64)dev->zone_offset); | |
2856 | } else { | |
2857 | dmz_dev_info(dev, " %llu 512-byte logical sectors", | |
2858 | (u64)dev->capacity); | |
2859 | dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors", | |
2860 | dev->nr_zones, (u64)zmd->zone_nr_sectors); | |
2861 | } | |
ca1a7045 HR |
2862 | } |
2863 | ||
3b1a94c8 DLM |
2864 | /* |
2865 | * Initialize the zoned metadata. | |
2866 | */ | |
bd5c4031 HR |
2867 | int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev, |
2868 | struct dmz_metadata **metadata, | |
2234e732 | 2869 | const char *devname) |
3b1a94c8 DLM |
2870 | { |
2871 | struct dmz_metadata *zmd; | |
b7122873 | 2872 | unsigned int i; |
3b1a94c8 DLM |
2873 | struct dm_zone *zone; |
2874 | int ret; | |
2875 | ||
2876 | zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL); | |
2877 | if (!zmd) | |
2878 | return -ENOMEM; | |
2879 | ||
2234e732 | 2880 | strcpy(zmd->devname, devname); |
3b1a94c8 | 2881 | zmd->dev = dev; |
bd5c4031 | 2882 | zmd->nr_devs = num_dev; |
3b1a94c8 DLM |
2883 | zmd->mblk_rbtree = RB_ROOT; |
2884 | init_rwsem(&zmd->mblk_sem); | |
2885 | mutex_init(&zmd->mblk_flush_lock); | |
2886 | spin_lock_init(&zmd->mblk_lock); | |
2887 | INIT_LIST_HEAD(&zmd->mblk_lru_list); | |
2888 | INIT_LIST_HEAD(&zmd->mblk_dirty_list); | |
2889 | ||
2890 | mutex_init(&zmd->map_lock); | |
3b1a94c8 | 2891 | |
34f5affd HR |
2892 | atomic_set(&zmd->unmap_nr_cache, 0); |
2893 | INIT_LIST_HEAD(&zmd->unmap_cache_list); | |
2894 | INIT_LIST_HEAD(&zmd->map_cache_list); | |
3b1a94c8 DLM |
2895 | |
2896 | atomic_set(&zmd->nr_reserved_seq_zones, 0); | |
2897 | INIT_LIST_HEAD(&zmd->reserved_seq_zones_list); | |
2898 | ||
2899 | init_waitqueue_head(&zmd->free_wq); | |
2900 | ||
2901 | /* Initialize zone descriptors */ | |
2902 | ret = dmz_init_zones(zmd); | |
2903 | if (ret) | |
2904 | goto err; | |
2905 | ||
2906 | /* Get super block */ | |
2907 | ret = dmz_load_sb(zmd); | |
2908 | if (ret) | |
2909 | goto err; | |
2910 | ||
2911 | /* Set metadata zones starting from sb_zone */ | |
3b1a94c8 | 2912 | for (i = 0; i < zmd->nr_meta_zones << 1; i++) { |
735bd7e4 | 2913 | zone = dmz_get(zmd, zmd->sb[0].zone->id + i); |
a92fbc44 HR |
2914 | if (!zone) { |
2915 | dmz_zmd_err(zmd, | |
2916 | "metadata zone %u not present", i); | |
2917 | ret = -ENXIO; | |
2918 | goto err; | |
2919 | } | |
34f5affd | 2920 | if (!dmz_is_rnd(zone) && !dmz_is_cache(zone)) { |
bd5c4031 HR |
2921 | dmz_zmd_err(zmd, |
2922 | "metadata zone %d is not random", i); | |
2923 | ret = -ENXIO; | |
3b1a94c8 | 2924 | goto err; |
bd5c4031 | 2925 | } |
3b1a94c8 DLM |
2926 | set_bit(DMZ_META, &zone->flags); |
2927 | } | |
3b1a94c8 DLM |
2928 | /* Load mapping table */ |
2929 | ret = dmz_load_mapping(zmd); | |
2930 | if (ret) | |
2931 | goto err; | |
2932 | ||
2933 | /* | |
2934 | * Cache size boundaries: allow at least 2 super blocks, the chunk map | |
2935 | * blocks and enough blocks to be able to cache the bitmap blocks of | |
2936 | * up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow | |
2937 | * the cache to add 512 more metadata blocks. | |
2938 | */ | |
2939 | zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16; | |
2940 | zmd->max_nr_mblks = zmd->min_nr_mblks + 512; | |
3b1a94c8 DLM |
2941 | |
2942 | /* Metadata cache shrinker */ | |
ba3d6aca QZ |
2943 | zmd->mblk_shrinker = shrinker_alloc(0, "dm-zoned-meta:(%u:%u)", |
2944 | MAJOR(dev->bdev->bd_dev), | |
2945 | MINOR(dev->bdev->bd_dev)); | |
2946 | if (!zmd->mblk_shrinker) { | |
2947 | ret = -ENOMEM; | |
2948 | dmz_zmd_err(zmd, "Allocate metadata cache shrinker failed"); | |
3b1a94c8 DLM |
2949 | goto err; |
2950 | } | |
2951 | ||
ba3d6aca QZ |
2952 | zmd->mblk_shrinker->count_objects = dmz_mblock_shrinker_count; |
2953 | zmd->mblk_shrinker->scan_objects = dmz_mblock_shrinker_scan; | |
2954 | zmd->mblk_shrinker->private_data = zmd; | |
2955 | ||
2956 | shrinker_register(zmd->mblk_shrinker); | |
2957 | ||
bd5c4031 HR |
2958 | dmz_zmd_info(zmd, "DM-Zoned metadata version %d", zmd->sb_version); |
2959 | for (i = 0; i < zmd->nr_devs; i++) | |
2960 | dmz_print_dev(zmd, i); | |
ca1a7045 HR |
2961 | |
2962 | dmz_zmd_info(zmd, " %u zones of %llu 512-byte logical sectors", | |
36820560 | 2963 | zmd->nr_zones, (u64)zmd->zone_nr_sectors); |
ae3c1f11 HR |
2964 | dmz_zmd_debug(zmd, " %u metadata zones", |
2965 | zmd->nr_meta_zones * 2); | |
2966 | dmz_zmd_debug(zmd, " %u data zones for %u chunks", | |
2967 | zmd->nr_data_zones, zmd->nr_chunks); | |
34f5affd HR |
2968 | dmz_zmd_debug(zmd, " %u cache zones (%u unmapped)", |
2969 | zmd->nr_cache, atomic_read(&zmd->unmap_nr_cache)); | |
bd82fdab HR |
2970 | for (i = 0; i < zmd->nr_devs; i++) { |
2971 | dmz_zmd_debug(zmd, " %u random zones (%u unmapped)", | |
2972 | dmz_nr_rnd_zones(zmd, i), | |
2973 | dmz_nr_unmap_rnd_zones(zmd, i)); | |
2974 | dmz_zmd_debug(zmd, " %u sequential zones (%u unmapped)", | |
2975 | dmz_nr_seq_zones(zmd, i), | |
2976 | dmz_nr_unmap_seq_zones(zmd, i)); | |
2977 | } | |
ae3c1f11 HR |
2978 | dmz_zmd_debug(zmd, " %u reserved sequential data zones", |
2979 | zmd->nr_reserved_seq); | |
ca1a7045 HR |
2980 | dmz_zmd_debug(zmd, "Format:"); |
2981 | dmz_zmd_debug(zmd, "%u metadata blocks per set (%u max cache)", | |
3b1a94c8 | 2982 | zmd->nr_meta_blocks, zmd->max_nr_mblks); |
ca1a7045 | 2983 | dmz_zmd_debug(zmd, " %u data zone mapping blocks", |
3b1a94c8 | 2984 | zmd->nr_map_blocks); |
ca1a7045 | 2985 | dmz_zmd_debug(zmd, " %u bitmap blocks", |
3b1a94c8 DLM |
2986 | zmd->nr_bitmap_blocks); |
2987 | ||
2988 | *metadata = zmd; | |
2989 | ||
2990 | return 0; | |
2991 | err: | |
2992 | dmz_cleanup_metadata(zmd); | |
2993 | kfree(zmd); | |
2994 | *metadata = NULL; | |
2995 | ||
2996 | return ret; | |
2997 | } | |
2998 | ||
2999 | /* | |
3000 | * Cleanup the zoned metadata resources. | |
3001 | */ | |
3002 | void dmz_dtr_metadata(struct dmz_metadata *zmd) | |
3003 | { | |
ba3d6aca | 3004 | shrinker_free(zmd->mblk_shrinker); |
3b1a94c8 DLM |
3005 | dmz_cleanup_metadata(zmd); |
3006 | kfree(zmd); | |
3007 | } | |
3008 | ||
3009 | /* | |
3010 | * Check zone information on resume. | |
3011 | */ | |
3012 | int dmz_resume_metadata(struct dmz_metadata *zmd) | |
3013 | { | |
3b1a94c8 DLM |
3014 | struct dm_zone *zone; |
3015 | sector_t wp_block; | |
3016 | unsigned int i; | |
3017 | int ret; | |
3018 | ||
3019 | /* Check zones */ | |
36820560 | 3020 | for (i = 0; i < zmd->nr_zones; i++) { |
3b1a94c8 DLM |
3021 | zone = dmz_get(zmd, i); |
3022 | if (!zone) { | |
ca1a7045 | 3023 | dmz_zmd_err(zmd, "Unable to get zone %u", i); |
3b1a94c8 DLM |
3024 | return -EIO; |
3025 | } | |
3b1a94c8 DLM |
3026 | wp_block = zone->wp_block; |
3027 | ||
3028 | ret = dmz_update_zone(zmd, zone); | |
3029 | if (ret) { | |
ca1a7045 | 3030 | dmz_zmd_err(zmd, "Broken zone %u", i); |
3b1a94c8 DLM |
3031 | return ret; |
3032 | } | |
3033 | ||
3034 | if (dmz_is_offline(zone)) { | |
ca1a7045 | 3035 | dmz_zmd_warn(zmd, "Zone %u is offline", i); |
3b1a94c8 DLM |
3036 | continue; |
3037 | } | |
3038 | ||
3039 | /* Check write pointer */ | |
3040 | if (!dmz_is_seq(zone)) | |
3041 | zone->wp_block = 0; | |
3042 | else if (zone->wp_block != wp_block) { | |
ca1a7045 | 3043 | dmz_zmd_err(zmd, "Zone %u: Invalid wp (%llu / %llu)", |
3b1a94c8 DLM |
3044 | i, (u64)zone->wp_block, (u64)wp_block); |
3045 | zone->wp_block = wp_block; | |
3046 | dmz_invalidate_blocks(zmd, zone, zone->wp_block, | |
36820560 | 3047 | zmd->zone_nr_blocks - zone->wp_block); |
3b1a94c8 DLM |
3048 | } |
3049 | } | |
3050 | ||
3051 | return 0; | |
3052 | } |