Dmitry Fomichev | bae9a0a | 2019-08-02 15:02:50 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 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> |
Damien Le Moal | bd976e5 | 2019-07-01 14:09:16 +0900 | [diff] [blame] | 12 | #include <linux/sched/mm.h> |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 13 | |
| 14 | #define DM_MSG_PREFIX "zoned metadata" |
| 15 | |
| 16 | /* |
| 17 | * Metadata version. |
| 18 | */ |
| 19 | #define DMZ_META_VER 1 |
| 20 | |
| 21 | /* |
| 22 | * On-disk super block magic. |
| 23 | */ |
| 24 | #define DMZ_MAGIC ((((unsigned int)('D')) << 24) | \ |
| 25 | (((unsigned int)('Z')) << 16) | \ |
| 26 | (((unsigned int)('B')) << 8) | \ |
| 27 | ((unsigned int)('D'))) |
| 28 | |
| 29 | /* |
| 30 | * On disk super block. |
| 31 | * This uses only 512 B but uses on disk a full 4KB block. This block is |
| 32 | * followed on disk by the mapping table of chunks to zones and the bitmap |
| 33 | * blocks indicating zone block validity. |
| 34 | * The overall resulting metadata format is: |
| 35 | * (1) Super block (1 block) |
| 36 | * (2) Chunk mapping table (nr_map_blocks) |
| 37 | * (3) Bitmap blocks (nr_bitmap_blocks) |
Dmitry Fomichev | ad1bd57 | 2019-08-02 15:02:51 -0700 | [diff] [blame] | 38 | * All metadata blocks are stored in conventional zones, starting from |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 39 | * the first conventional zone found on disk. |
| 40 | */ |
| 41 | struct dmz_super { |
| 42 | /* Magic number */ |
| 43 | __le32 magic; /* 4 */ |
| 44 | |
| 45 | /* Metadata version number */ |
| 46 | __le32 version; /* 8 */ |
| 47 | |
| 48 | /* Generation number */ |
| 49 | __le64 gen; /* 16 */ |
| 50 | |
| 51 | /* This block number */ |
| 52 | __le64 sb_block; /* 24 */ |
| 53 | |
| 54 | /* The number of metadata blocks, including this super block */ |
| 55 | __le32 nr_meta_blocks; /* 28 */ |
| 56 | |
| 57 | /* The number of sequential zones reserved for reclaim */ |
| 58 | __le32 nr_reserved_seq; /* 32 */ |
| 59 | |
| 60 | /* The number of entries in the mapping table */ |
| 61 | __le32 nr_chunks; /* 36 */ |
| 62 | |
| 63 | /* The number of blocks used for the chunk mapping table */ |
| 64 | __le32 nr_map_blocks; /* 40 */ |
| 65 | |
| 66 | /* The number of blocks used for the block bitmaps */ |
| 67 | __le32 nr_bitmap_blocks; /* 44 */ |
| 68 | |
| 69 | /* Checksum */ |
| 70 | __le32 crc; /* 48 */ |
| 71 | |
| 72 | /* Padding to full 512B sector */ |
| 73 | u8 reserved[464]; /* 512 */ |
| 74 | }; |
| 75 | |
| 76 | /* |
| 77 | * Chunk mapping entry: entries are indexed by chunk number |
| 78 | * and give the zone ID (dzone_id) mapping the chunk on disk. |
| 79 | * This zone may be sequential or random. If it is a sequential |
| 80 | * zone, a second zone (bzone_id) used as a write buffer may |
| 81 | * also be specified. This second zone will always be a randomly |
| 82 | * writeable zone. |
| 83 | */ |
| 84 | struct dmz_map { |
| 85 | __le32 dzone_id; |
| 86 | __le32 bzone_id; |
| 87 | }; |
| 88 | |
| 89 | /* |
| 90 | * Chunk mapping table metadata: 512 8-bytes entries per 4KB block. |
| 91 | */ |
| 92 | #define DMZ_MAP_ENTRIES (DMZ_BLOCK_SIZE / sizeof(struct dmz_map)) |
| 93 | #define DMZ_MAP_ENTRIES_SHIFT (ilog2(DMZ_MAP_ENTRIES)) |
| 94 | #define DMZ_MAP_ENTRIES_MASK (DMZ_MAP_ENTRIES - 1) |
| 95 | #define DMZ_MAP_UNMAPPED UINT_MAX |
| 96 | |
| 97 | /* |
| 98 | * Meta data block descriptor (for cached metadata blocks). |
| 99 | */ |
| 100 | struct dmz_mblock { |
| 101 | struct rb_node node; |
| 102 | struct list_head link; |
| 103 | sector_t no; |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 104 | unsigned int ref; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 105 | unsigned long state; |
| 106 | struct page *page; |
| 107 | void *data; |
| 108 | }; |
| 109 | |
| 110 | /* |
| 111 | * Metadata block state flags. |
| 112 | */ |
| 113 | enum { |
| 114 | DMZ_META_DIRTY, |
| 115 | DMZ_META_READING, |
| 116 | DMZ_META_WRITING, |
| 117 | DMZ_META_ERROR, |
| 118 | }; |
| 119 | |
| 120 | /* |
| 121 | * Super block information (one per metadata set). |
| 122 | */ |
| 123 | struct dmz_sb { |
| 124 | sector_t block; |
| 125 | struct dmz_mblock *mblk; |
| 126 | struct dmz_super *sb; |
| 127 | }; |
| 128 | |
| 129 | /* |
| 130 | * In-memory metadata. |
| 131 | */ |
| 132 | struct dmz_metadata { |
| 133 | struct dmz_dev *dev; |
| 134 | |
| 135 | sector_t zone_bitmap_size; |
| 136 | unsigned int zone_nr_bitmap_blocks; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 137 | unsigned int zone_bits_per_mblk; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 138 | |
| 139 | unsigned int nr_bitmap_blocks; |
| 140 | unsigned int nr_map_blocks; |
| 141 | |
| 142 | unsigned int nr_useable_zones; |
| 143 | unsigned int nr_meta_blocks; |
| 144 | unsigned int nr_meta_zones; |
| 145 | unsigned int nr_data_zones; |
| 146 | unsigned int nr_rnd_zones; |
| 147 | unsigned int nr_reserved_seq; |
| 148 | unsigned int nr_chunks; |
| 149 | |
| 150 | /* Zone information array */ |
| 151 | struct dm_zone *zones; |
| 152 | |
| 153 | struct dm_zone *sb_zone; |
| 154 | struct dmz_sb sb[2]; |
| 155 | unsigned int mblk_primary; |
| 156 | u64 sb_gen; |
| 157 | unsigned int min_nr_mblks; |
| 158 | unsigned int max_nr_mblks; |
| 159 | atomic_t nr_mblks; |
| 160 | struct rw_semaphore mblk_sem; |
| 161 | struct mutex mblk_flush_lock; |
| 162 | spinlock_t mblk_lock; |
| 163 | struct rb_root mblk_rbtree; |
| 164 | struct list_head mblk_lru_list; |
| 165 | struct list_head mblk_dirty_list; |
| 166 | struct shrinker mblk_shrinker; |
| 167 | |
| 168 | /* Zone allocation management */ |
| 169 | struct mutex map_lock; |
| 170 | struct dmz_mblock **map_mblk; |
| 171 | unsigned int nr_rnd; |
| 172 | atomic_t unmap_nr_rnd; |
| 173 | struct list_head unmap_rnd_list; |
| 174 | struct list_head map_rnd_list; |
| 175 | |
| 176 | unsigned int nr_seq; |
| 177 | atomic_t unmap_nr_seq; |
| 178 | struct list_head unmap_seq_list; |
| 179 | struct list_head map_seq_list; |
| 180 | |
| 181 | atomic_t nr_reserved_seq_zones; |
| 182 | struct list_head reserved_seq_zones_list; |
| 183 | |
| 184 | wait_queue_head_t free_wq; |
| 185 | }; |
| 186 | |
| 187 | /* |
| 188 | * Various accessors |
| 189 | */ |
| 190 | unsigned int dmz_id(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 191 | { |
| 192 | return ((unsigned int)(zone - zmd->zones)); |
| 193 | } |
| 194 | |
| 195 | sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 196 | { |
Damien Le Moal | 3908c98 | 2017-07-03 15:44:58 +0900 | [diff] [blame] | 197 | return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_sectors_shift; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 201 | { |
Damien Le Moal | 3908c98 | 2017-07-03 15:44:58 +0900 | [diff] [blame] | 202 | return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_blocks_shift; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | unsigned int dmz_nr_chunks(struct dmz_metadata *zmd) |
| 206 | { |
| 207 | return zmd->nr_chunks; |
| 208 | } |
| 209 | |
| 210 | unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd) |
| 211 | { |
| 212 | return zmd->nr_rnd; |
| 213 | } |
| 214 | |
| 215 | unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd) |
| 216 | { |
| 217 | return atomic_read(&zmd->unmap_nr_rnd); |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * Lock/unlock mapping table. |
| 222 | * The map lock also protects all the zone lists. |
| 223 | */ |
| 224 | void dmz_lock_map(struct dmz_metadata *zmd) |
| 225 | { |
| 226 | mutex_lock(&zmd->map_lock); |
| 227 | } |
| 228 | |
| 229 | void dmz_unlock_map(struct dmz_metadata *zmd) |
| 230 | { |
| 231 | mutex_unlock(&zmd->map_lock); |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Lock/unlock metadata access. This is a "read" lock on a semaphore |
| 236 | * that prevents metadata flush from running while metadata are being |
| 237 | * modified. The actual metadata write mutual exclusion is achieved with |
Dmitry Fomichev | ad1bd57 | 2019-08-02 15:02:51 -0700 | [diff] [blame] | 238 | * the map lock and zone state management (active and reclaim state are |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 239 | * mutually exclusive). |
| 240 | */ |
| 241 | void dmz_lock_metadata(struct dmz_metadata *zmd) |
| 242 | { |
| 243 | down_read(&zmd->mblk_sem); |
| 244 | } |
| 245 | |
| 246 | void dmz_unlock_metadata(struct dmz_metadata *zmd) |
| 247 | { |
| 248 | up_read(&zmd->mblk_sem); |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * Lock/unlock flush: prevent concurrent executions |
| 253 | * of dmz_flush_metadata as well as metadata modification in reclaim |
| 254 | * while flush is being executed. |
| 255 | */ |
| 256 | void dmz_lock_flush(struct dmz_metadata *zmd) |
| 257 | { |
| 258 | mutex_lock(&zmd->mblk_flush_lock); |
| 259 | } |
| 260 | |
| 261 | void dmz_unlock_flush(struct dmz_metadata *zmd) |
| 262 | { |
| 263 | mutex_unlock(&zmd->mblk_flush_lock); |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * Allocate a metadata block. |
| 268 | */ |
| 269 | static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd, |
| 270 | sector_t mblk_no) |
| 271 | { |
| 272 | struct dmz_mblock *mblk = NULL; |
| 273 | |
| 274 | /* See if we can reuse cached blocks */ |
| 275 | if (zmd->max_nr_mblks && atomic_read(&zmd->nr_mblks) > zmd->max_nr_mblks) { |
| 276 | spin_lock(&zmd->mblk_lock); |
| 277 | mblk = list_first_entry_or_null(&zmd->mblk_lru_list, |
| 278 | struct dmz_mblock, link); |
| 279 | if (mblk) { |
| 280 | list_del_init(&mblk->link); |
| 281 | rb_erase(&mblk->node, &zmd->mblk_rbtree); |
| 282 | mblk->no = mblk_no; |
| 283 | } |
| 284 | spin_unlock(&zmd->mblk_lock); |
| 285 | if (mblk) |
| 286 | return mblk; |
| 287 | } |
| 288 | |
| 289 | /* Allocate a new block */ |
| 290 | mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO); |
| 291 | if (!mblk) |
| 292 | return NULL; |
| 293 | |
| 294 | mblk->page = alloc_page(GFP_NOIO); |
| 295 | if (!mblk->page) { |
| 296 | kfree(mblk); |
| 297 | return NULL; |
| 298 | } |
| 299 | |
| 300 | RB_CLEAR_NODE(&mblk->node); |
| 301 | INIT_LIST_HEAD(&mblk->link); |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 302 | mblk->ref = 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 303 | mblk->state = 0; |
| 304 | mblk->no = mblk_no; |
| 305 | mblk->data = page_address(mblk->page); |
| 306 | |
| 307 | atomic_inc(&zmd->nr_mblks); |
| 308 | |
| 309 | return mblk; |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * Free a metadata block. |
| 314 | */ |
| 315 | static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) |
| 316 | { |
| 317 | __free_pages(mblk->page, 0); |
| 318 | kfree(mblk); |
| 319 | |
| 320 | atomic_dec(&zmd->nr_mblks); |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * Insert a metadata block in the rbtree. |
| 325 | */ |
| 326 | static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) |
| 327 | { |
| 328 | struct rb_root *root = &zmd->mblk_rbtree; |
| 329 | struct rb_node **new = &(root->rb_node), *parent = NULL; |
| 330 | struct dmz_mblock *b; |
| 331 | |
| 332 | /* Figure out where to put the new node */ |
| 333 | while (*new) { |
| 334 | b = container_of(*new, struct dmz_mblock, node); |
| 335 | parent = *new; |
| 336 | new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right); |
| 337 | } |
| 338 | |
| 339 | /* Add new node and rebalance tree */ |
| 340 | rb_link_node(&mblk->node, parent, new); |
| 341 | rb_insert_color(&mblk->node, root); |
| 342 | } |
| 343 | |
| 344 | /* |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 345 | * Lookup a metadata block in the rbtree. If the block is found, increment |
| 346 | * its reference count. |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 347 | */ |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 348 | static struct dmz_mblock *dmz_get_mblock_fast(struct dmz_metadata *zmd, |
| 349 | sector_t mblk_no) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 350 | { |
| 351 | struct rb_root *root = &zmd->mblk_rbtree; |
| 352 | struct rb_node *node = root->rb_node; |
| 353 | struct dmz_mblock *mblk; |
| 354 | |
| 355 | while (node) { |
| 356 | mblk = container_of(node, struct dmz_mblock, node); |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 357 | if (mblk->no == mblk_no) { |
| 358 | /* |
| 359 | * If this is the first reference to the block, |
| 360 | * remove it from the LRU list. |
| 361 | */ |
| 362 | mblk->ref++; |
| 363 | if (mblk->ref == 1 && |
| 364 | !test_bit(DMZ_META_DIRTY, &mblk->state)) |
| 365 | list_del_init(&mblk->link); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 366 | return mblk; |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 367 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 368 | node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right; |
| 369 | } |
| 370 | |
| 371 | return NULL; |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * Metadata block BIO end callback. |
| 376 | */ |
| 377 | static void dmz_mblock_bio_end_io(struct bio *bio) |
| 378 | { |
| 379 | struct dmz_mblock *mblk = bio->bi_private; |
| 380 | int flag; |
| 381 | |
| 382 | if (bio->bi_status) |
| 383 | set_bit(DMZ_META_ERROR, &mblk->state); |
| 384 | |
| 385 | if (bio_op(bio) == REQ_OP_WRITE) |
| 386 | flag = DMZ_META_WRITING; |
| 387 | else |
| 388 | flag = DMZ_META_READING; |
| 389 | |
| 390 | clear_bit_unlock(flag, &mblk->state); |
| 391 | smp_mb__after_atomic(); |
| 392 | wake_up_bit(&mblk->state, flag); |
| 393 | |
| 394 | bio_put(bio); |
| 395 | } |
| 396 | |
| 397 | /* |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 398 | * Read an uncached metadata block from disk and add it to the cache. |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 399 | */ |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 400 | static struct dmz_mblock *dmz_get_mblock_slow(struct dmz_metadata *zmd, |
| 401 | sector_t mblk_no) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 402 | { |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 403 | struct dmz_mblock *mblk, *m; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 404 | sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no; |
| 405 | struct bio *bio; |
| 406 | |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 407 | if (dmz_bdev_is_dying(zmd->dev)) |
| 408 | return ERR_PTR(-EIO); |
| 409 | |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 410 | /* Get a new block and a BIO to read it */ |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 411 | mblk = dmz_alloc_mblock(zmd, mblk_no); |
| 412 | if (!mblk) |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 413 | return ERR_PTR(-ENOMEM); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 414 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 415 | bio = bio_alloc(GFP_NOIO, 1); |
| 416 | if (!bio) { |
| 417 | dmz_free_mblock(zmd, mblk); |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 418 | return ERR_PTR(-ENOMEM); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 419 | } |
| 420 | |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 421 | spin_lock(&zmd->mblk_lock); |
| 422 | |
| 423 | /* |
| 424 | * Make sure that another context did not start reading |
| 425 | * the block already. |
| 426 | */ |
| 427 | m = dmz_get_mblock_fast(zmd, mblk_no); |
| 428 | if (m) { |
| 429 | spin_unlock(&zmd->mblk_lock); |
| 430 | dmz_free_mblock(zmd, mblk); |
| 431 | bio_put(bio); |
| 432 | return m; |
| 433 | } |
| 434 | |
| 435 | mblk->ref++; |
| 436 | set_bit(DMZ_META_READING, &mblk->state); |
| 437 | dmz_insert_mblock(zmd, mblk); |
| 438 | |
| 439 | spin_unlock(&zmd->mblk_lock); |
| 440 | |
| 441 | /* Submit read BIO */ |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 442 | bio->bi_iter.bi_sector = dmz_blk2sect(block); |
Christoph Hellwig | 74d4699 | 2017-08-23 19:10:32 +0200 | [diff] [blame] | 443 | bio_set_dev(bio, zmd->dev->bdev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 444 | bio->bi_private = mblk; |
| 445 | bio->bi_end_io = dmz_mblock_bio_end_io; |
| 446 | bio_set_op_attrs(bio, REQ_OP_READ, REQ_META | REQ_PRIO); |
| 447 | bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); |
| 448 | submit_bio(bio); |
| 449 | |
| 450 | return mblk; |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * Free metadata blocks. |
| 455 | */ |
| 456 | static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd, |
| 457 | unsigned long limit) |
| 458 | { |
| 459 | struct dmz_mblock *mblk; |
| 460 | unsigned long count = 0; |
| 461 | |
| 462 | if (!zmd->max_nr_mblks) |
| 463 | return 0; |
| 464 | |
| 465 | while (!list_empty(&zmd->mblk_lru_list) && |
| 466 | atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks && |
| 467 | count < limit) { |
| 468 | mblk = list_first_entry(&zmd->mblk_lru_list, |
| 469 | struct dmz_mblock, link); |
| 470 | list_del_init(&mblk->link); |
| 471 | rb_erase(&mblk->node, &zmd->mblk_rbtree); |
| 472 | dmz_free_mblock(zmd, mblk); |
| 473 | count++; |
| 474 | } |
| 475 | |
| 476 | return count; |
| 477 | } |
| 478 | |
| 479 | /* |
| 480 | * For mblock shrinker: get the number of unused metadata blocks in the cache. |
| 481 | */ |
| 482 | static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink, |
| 483 | struct shrink_control *sc) |
| 484 | { |
| 485 | struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); |
| 486 | |
| 487 | return atomic_read(&zmd->nr_mblks); |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * For mblock shrinker: scan unused metadata blocks and shrink the cache. |
| 492 | */ |
| 493 | static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink, |
| 494 | struct shrink_control *sc) |
| 495 | { |
| 496 | struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); |
| 497 | unsigned long count; |
| 498 | |
| 499 | spin_lock(&zmd->mblk_lock); |
| 500 | count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan); |
| 501 | spin_unlock(&zmd->mblk_lock); |
| 502 | |
| 503 | return count ? count : SHRINK_STOP; |
| 504 | } |
| 505 | |
| 506 | /* |
| 507 | * Release a metadata block. |
| 508 | */ |
| 509 | static void dmz_release_mblock(struct dmz_metadata *zmd, |
| 510 | struct dmz_mblock *mblk) |
| 511 | { |
| 512 | |
| 513 | if (!mblk) |
| 514 | return; |
| 515 | |
| 516 | spin_lock(&zmd->mblk_lock); |
| 517 | |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 518 | mblk->ref--; |
| 519 | if (mblk->ref == 0) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 520 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { |
| 521 | rb_erase(&mblk->node, &zmd->mblk_rbtree); |
| 522 | dmz_free_mblock(zmd, mblk); |
| 523 | } else if (!test_bit(DMZ_META_DIRTY, &mblk->state)) { |
| 524 | list_add_tail(&mblk->link, &zmd->mblk_lru_list); |
| 525 | dmz_shrink_mblock_cache(zmd, 1); |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | spin_unlock(&zmd->mblk_lock); |
| 530 | } |
| 531 | |
| 532 | /* |
| 533 | * Get a metadata block from the rbtree. If the block |
| 534 | * is not present, read it from disk. |
| 535 | */ |
| 536 | static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd, |
| 537 | sector_t mblk_no) |
| 538 | { |
| 539 | struct dmz_mblock *mblk; |
| 540 | |
| 541 | /* Check rbtree */ |
| 542 | spin_lock(&zmd->mblk_lock); |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 543 | mblk = dmz_get_mblock_fast(zmd, mblk_no); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 544 | spin_unlock(&zmd->mblk_lock); |
| 545 | |
| 546 | if (!mblk) { |
| 547 | /* Cache miss: read the block from disk */ |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 548 | mblk = dmz_get_mblock_slow(zmd, mblk_no); |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 549 | if (IS_ERR(mblk)) |
| 550 | return mblk; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | /* Wait for on-going read I/O and check for error */ |
| 554 | wait_on_bit_io(&mblk->state, DMZ_META_READING, |
| 555 | TASK_UNINTERRUPTIBLE); |
| 556 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { |
| 557 | dmz_release_mblock(zmd, mblk); |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 558 | dmz_check_bdev(zmd->dev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 559 | return ERR_PTR(-EIO); |
| 560 | } |
| 561 | |
| 562 | return mblk; |
| 563 | } |
| 564 | |
| 565 | /* |
| 566 | * Mark a metadata block dirty. |
| 567 | */ |
| 568 | static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) |
| 569 | { |
| 570 | spin_lock(&zmd->mblk_lock); |
| 571 | if (!test_and_set_bit(DMZ_META_DIRTY, &mblk->state)) |
| 572 | list_add_tail(&mblk->link, &zmd->mblk_dirty_list); |
| 573 | spin_unlock(&zmd->mblk_lock); |
| 574 | } |
| 575 | |
| 576 | /* |
| 577 | * Issue a metadata block write BIO. |
| 578 | */ |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 579 | static int dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk, |
| 580 | unsigned int set) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 581 | { |
| 582 | sector_t block = zmd->sb[set].block + mblk->no; |
| 583 | struct bio *bio; |
| 584 | |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 585 | if (dmz_bdev_is_dying(zmd->dev)) |
| 586 | return -EIO; |
| 587 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 588 | bio = bio_alloc(GFP_NOIO, 1); |
| 589 | if (!bio) { |
| 590 | set_bit(DMZ_META_ERROR, &mblk->state); |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 591 | return -ENOMEM; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | set_bit(DMZ_META_WRITING, &mblk->state); |
| 595 | |
| 596 | bio->bi_iter.bi_sector = dmz_blk2sect(block); |
Christoph Hellwig | 74d4699 | 2017-08-23 19:10:32 +0200 | [diff] [blame] | 597 | bio_set_dev(bio, zmd->dev->bdev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 598 | bio->bi_private = mblk; |
| 599 | bio->bi_end_io = dmz_mblock_bio_end_io; |
| 600 | bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_META | REQ_PRIO); |
| 601 | bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); |
| 602 | submit_bio(bio); |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 603 | |
| 604 | return 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 605 | } |
| 606 | |
| 607 | /* |
| 608 | * Read/write a metadata block. |
| 609 | */ |
| 610 | static int dmz_rdwr_block(struct dmz_metadata *zmd, int op, sector_t block, |
| 611 | struct page *page) |
| 612 | { |
| 613 | struct bio *bio; |
| 614 | int ret; |
| 615 | |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 616 | if (dmz_bdev_is_dying(zmd->dev)) |
| 617 | return -EIO; |
| 618 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 619 | bio = bio_alloc(GFP_NOIO, 1); |
| 620 | if (!bio) |
| 621 | return -ENOMEM; |
| 622 | |
| 623 | bio->bi_iter.bi_sector = dmz_blk2sect(block); |
Christoph Hellwig | 74d4699 | 2017-08-23 19:10:32 +0200 | [diff] [blame] | 624 | bio_set_dev(bio, zmd->dev->bdev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 625 | bio_set_op_attrs(bio, op, REQ_SYNC | REQ_META | REQ_PRIO); |
| 626 | bio_add_page(bio, page, DMZ_BLOCK_SIZE, 0); |
| 627 | ret = submit_bio_wait(bio); |
| 628 | bio_put(bio); |
| 629 | |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 630 | if (ret) |
| 631 | dmz_check_bdev(zmd->dev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 632 | return ret; |
| 633 | } |
| 634 | |
| 635 | /* |
| 636 | * Write super block of the specified metadata set. |
| 637 | */ |
| 638 | static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set) |
| 639 | { |
| 640 | sector_t block = zmd->sb[set].block; |
| 641 | struct dmz_mblock *mblk = zmd->sb[set].mblk; |
| 642 | struct dmz_super *sb = zmd->sb[set].sb; |
| 643 | u64 sb_gen = zmd->sb_gen + 1; |
| 644 | int ret; |
| 645 | |
| 646 | sb->magic = cpu_to_le32(DMZ_MAGIC); |
| 647 | sb->version = cpu_to_le32(DMZ_META_VER); |
| 648 | |
| 649 | sb->gen = cpu_to_le64(sb_gen); |
| 650 | |
| 651 | sb->sb_block = cpu_to_le64(block); |
| 652 | sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks); |
| 653 | sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq); |
| 654 | sb->nr_chunks = cpu_to_le32(zmd->nr_chunks); |
| 655 | |
| 656 | sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks); |
| 657 | sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks); |
| 658 | |
| 659 | sb->crc = 0; |
| 660 | sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE)); |
| 661 | |
| 662 | ret = dmz_rdwr_block(zmd, REQ_OP_WRITE, block, mblk->page); |
| 663 | if (ret == 0) |
Damien Le Moal | 4218a95 | 2017-07-24 16:44:37 +0900 | [diff] [blame] | 664 | ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO, NULL); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 665 | |
| 666 | return ret; |
| 667 | } |
| 668 | |
| 669 | /* |
| 670 | * Write dirty metadata blocks to the specified set. |
| 671 | */ |
| 672 | static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd, |
| 673 | struct list_head *write_list, |
| 674 | unsigned int set) |
| 675 | { |
| 676 | struct dmz_mblock *mblk; |
| 677 | struct blk_plug plug; |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 678 | int ret = 0, nr_mblks_submitted = 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 679 | |
| 680 | /* Issue writes */ |
| 681 | blk_start_plug(&plug); |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 682 | list_for_each_entry(mblk, write_list, link) { |
| 683 | ret = dmz_write_mblock(zmd, mblk, set); |
| 684 | if (ret) |
| 685 | break; |
| 686 | nr_mblks_submitted++; |
| 687 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 688 | blk_finish_plug(&plug); |
| 689 | |
| 690 | /* Wait for completion */ |
| 691 | list_for_each_entry(mblk, write_list, link) { |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 692 | if (!nr_mblks_submitted) |
| 693 | break; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 694 | wait_on_bit_io(&mblk->state, DMZ_META_WRITING, |
| 695 | TASK_UNINTERRUPTIBLE); |
| 696 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { |
| 697 | clear_bit(DMZ_META_ERROR, &mblk->state); |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 698 | dmz_check_bdev(zmd->dev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 699 | ret = -EIO; |
| 700 | } |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 701 | nr_mblks_submitted--; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 702 | } |
| 703 | |
| 704 | /* Flush drive cache (this will also sync data) */ |
| 705 | if (ret == 0) |
Damien Le Moal | 4218a95 | 2017-07-24 16:44:37 +0900 | [diff] [blame] | 706 | ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO, NULL); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 707 | |
| 708 | return ret; |
| 709 | } |
| 710 | |
| 711 | /* |
| 712 | * Log dirty metadata blocks. |
| 713 | */ |
| 714 | static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd, |
| 715 | struct list_head *write_list) |
| 716 | { |
| 717 | unsigned int log_set = zmd->mblk_primary ^ 0x1; |
| 718 | int ret; |
| 719 | |
| 720 | /* Write dirty blocks to the log */ |
| 721 | ret = dmz_write_dirty_mblocks(zmd, write_list, log_set); |
| 722 | if (ret) |
| 723 | return ret; |
| 724 | |
| 725 | /* |
| 726 | * No error so far: now validate the log by updating the |
| 727 | * log index super block generation. |
| 728 | */ |
| 729 | ret = dmz_write_sb(zmd, log_set); |
| 730 | if (ret) |
| 731 | return ret; |
| 732 | |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 736 | /* |
| 737 | * Flush dirty metadata blocks. |
| 738 | */ |
| 739 | int dmz_flush_metadata(struct dmz_metadata *zmd) |
| 740 | { |
| 741 | struct dmz_mblock *mblk; |
| 742 | struct list_head write_list; |
| 743 | int ret; |
| 744 | |
| 745 | if (WARN_ON(!zmd)) |
| 746 | return 0; |
| 747 | |
| 748 | INIT_LIST_HEAD(&write_list); |
| 749 | |
| 750 | /* |
| 751 | * Make sure that metadata blocks are stable before logging: take |
| 752 | * the write lock on the metadata semaphore to prevent target BIOs |
| 753 | * from modifying metadata. |
| 754 | */ |
| 755 | down_write(&zmd->mblk_sem); |
| 756 | |
| 757 | /* |
| 758 | * This is called from the target flush work and reclaim work. |
| 759 | * Concurrent execution is not allowed. |
| 760 | */ |
| 761 | dmz_lock_flush(zmd); |
| 762 | |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 763 | if (dmz_bdev_is_dying(zmd->dev)) { |
| 764 | ret = -EIO; |
| 765 | goto out; |
| 766 | } |
| 767 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 768 | /* Get dirty blocks */ |
| 769 | spin_lock(&zmd->mblk_lock); |
| 770 | list_splice_init(&zmd->mblk_dirty_list, &write_list); |
| 771 | spin_unlock(&zmd->mblk_lock); |
| 772 | |
| 773 | /* If there are no dirty metadata blocks, just flush the device cache */ |
| 774 | if (list_empty(&write_list)) { |
Damien Le Moal | 4218a95 | 2017-07-24 16:44:37 +0900 | [diff] [blame] | 775 | ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO, NULL); |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 776 | goto err; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 777 | } |
| 778 | |
| 779 | /* |
| 780 | * The primary metadata set is still clean. Keep it this way until |
| 781 | * all updates are successful in the secondary set. That is, use |
| 782 | * the secondary set as a log. |
| 783 | */ |
| 784 | ret = dmz_log_dirty_mblocks(zmd, &write_list); |
| 785 | if (ret) |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 786 | goto err; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 787 | |
| 788 | /* |
| 789 | * The log is on disk. It is now safe to update in place |
| 790 | * in the primary metadata set. |
| 791 | */ |
| 792 | ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary); |
| 793 | if (ret) |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 794 | goto err; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 795 | |
| 796 | ret = dmz_write_sb(zmd, zmd->mblk_primary); |
| 797 | if (ret) |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 798 | goto err; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 799 | |
| 800 | while (!list_empty(&write_list)) { |
| 801 | mblk = list_first_entry(&write_list, struct dmz_mblock, link); |
| 802 | list_del_init(&mblk->link); |
| 803 | |
| 804 | spin_lock(&zmd->mblk_lock); |
| 805 | clear_bit(DMZ_META_DIRTY, &mblk->state); |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 806 | if (mblk->ref == 0) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 807 | list_add_tail(&mblk->link, &zmd->mblk_lru_list); |
| 808 | spin_unlock(&zmd->mblk_lock); |
| 809 | } |
| 810 | |
| 811 | zmd->sb_gen++; |
| 812 | out: |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 813 | dmz_unlock_flush(zmd); |
| 814 | up_write(&zmd->mblk_sem); |
| 815 | |
| 816 | return ret; |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 817 | |
| 818 | err: |
| 819 | if (!list_empty(&write_list)) { |
| 820 | spin_lock(&zmd->mblk_lock); |
| 821 | list_splice(&write_list, &zmd->mblk_dirty_list); |
| 822 | spin_unlock(&zmd->mblk_lock); |
| 823 | } |
| 824 | if (!dmz_check_bdev(zmd->dev)) |
| 825 | ret = -EIO; |
| 826 | goto out; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 827 | } |
| 828 | |
| 829 | /* |
| 830 | * Check super block. |
| 831 | */ |
| 832 | static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_super *sb) |
| 833 | { |
| 834 | unsigned int nr_meta_zones, nr_data_zones; |
| 835 | struct dmz_dev *dev = zmd->dev; |
| 836 | u32 crc, stored_crc; |
| 837 | u64 gen; |
| 838 | |
| 839 | gen = le64_to_cpu(sb->gen); |
| 840 | stored_crc = le32_to_cpu(sb->crc); |
| 841 | sb->crc = 0; |
| 842 | crc = crc32_le(gen, (unsigned char *)sb, DMZ_BLOCK_SIZE); |
| 843 | if (crc != stored_crc) { |
| 844 | dmz_dev_err(dev, "Invalid checksum (needed 0x%08x, got 0x%08x)", |
| 845 | crc, stored_crc); |
| 846 | return -ENXIO; |
| 847 | } |
| 848 | |
| 849 | if (le32_to_cpu(sb->magic) != DMZ_MAGIC) { |
| 850 | dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)", |
| 851 | DMZ_MAGIC, le32_to_cpu(sb->magic)); |
| 852 | return -ENXIO; |
| 853 | } |
| 854 | |
| 855 | if (le32_to_cpu(sb->version) != DMZ_META_VER) { |
| 856 | dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)", |
| 857 | DMZ_META_VER, le32_to_cpu(sb->version)); |
| 858 | return -ENXIO; |
| 859 | } |
| 860 | |
| 861 | nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + dev->zone_nr_blocks - 1) |
| 862 | >> dev->zone_nr_blocks_shift; |
| 863 | if (!nr_meta_zones || |
| 864 | nr_meta_zones >= zmd->nr_rnd_zones) { |
| 865 | dmz_dev_err(dev, "Invalid number of metadata blocks"); |
| 866 | return -ENXIO; |
| 867 | } |
| 868 | |
| 869 | if (!le32_to_cpu(sb->nr_reserved_seq) || |
| 870 | le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) { |
| 871 | dmz_dev_err(dev, "Invalid number of reserved sequential zones"); |
| 872 | return -ENXIO; |
| 873 | } |
| 874 | |
| 875 | nr_data_zones = zmd->nr_useable_zones - |
| 876 | (nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq)); |
| 877 | if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) { |
| 878 | dmz_dev_err(dev, "Invalid number of chunks %u / %u", |
| 879 | le32_to_cpu(sb->nr_chunks), nr_data_zones); |
| 880 | return -ENXIO; |
| 881 | } |
| 882 | |
| 883 | /* OK */ |
| 884 | zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks); |
| 885 | zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq); |
| 886 | zmd->nr_chunks = le32_to_cpu(sb->nr_chunks); |
| 887 | zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks); |
| 888 | zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks); |
| 889 | zmd->nr_meta_zones = nr_meta_zones; |
| 890 | zmd->nr_data_zones = nr_data_zones; |
| 891 | |
| 892 | return 0; |
| 893 | } |
| 894 | |
| 895 | /* |
| 896 | * Read the first or second super block from disk. |
| 897 | */ |
| 898 | static int dmz_read_sb(struct dmz_metadata *zmd, unsigned int set) |
| 899 | { |
| 900 | return dmz_rdwr_block(zmd, REQ_OP_READ, zmd->sb[set].block, |
| 901 | zmd->sb[set].mblk->page); |
| 902 | } |
| 903 | |
| 904 | /* |
| 905 | * Determine the position of the secondary super blocks on disk. |
| 906 | * This is used only if a corruption of the primary super block |
| 907 | * is detected. |
| 908 | */ |
| 909 | static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd) |
| 910 | { |
| 911 | unsigned int zone_nr_blocks = zmd->dev->zone_nr_blocks; |
| 912 | struct dmz_mblock *mblk; |
| 913 | int i; |
| 914 | |
| 915 | /* Allocate a block */ |
| 916 | mblk = dmz_alloc_mblock(zmd, 0); |
| 917 | if (!mblk) |
| 918 | return -ENOMEM; |
| 919 | |
| 920 | zmd->sb[1].mblk = mblk; |
| 921 | zmd->sb[1].sb = mblk->data; |
| 922 | |
| 923 | /* Bad first super block: search for the second one */ |
| 924 | zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks; |
| 925 | for (i = 0; i < zmd->nr_rnd_zones - 1; i++) { |
| 926 | if (dmz_read_sb(zmd, 1) != 0) |
| 927 | break; |
| 928 | if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC) |
| 929 | return 0; |
| 930 | zmd->sb[1].block += zone_nr_blocks; |
| 931 | } |
| 932 | |
| 933 | dmz_free_mblock(zmd, mblk); |
| 934 | zmd->sb[1].mblk = NULL; |
| 935 | |
| 936 | return -EIO; |
| 937 | } |
| 938 | |
| 939 | /* |
| 940 | * Read the first or second super block from disk. |
| 941 | */ |
| 942 | static int dmz_get_sb(struct dmz_metadata *zmd, unsigned int set) |
| 943 | { |
| 944 | struct dmz_mblock *mblk; |
| 945 | int ret; |
| 946 | |
| 947 | /* Allocate a block */ |
| 948 | mblk = dmz_alloc_mblock(zmd, 0); |
| 949 | if (!mblk) |
| 950 | return -ENOMEM; |
| 951 | |
| 952 | zmd->sb[set].mblk = mblk; |
| 953 | zmd->sb[set].sb = mblk->data; |
| 954 | |
| 955 | /* Read super block */ |
| 956 | ret = dmz_read_sb(zmd, set); |
| 957 | if (ret) { |
| 958 | dmz_free_mblock(zmd, mblk); |
| 959 | zmd->sb[set].mblk = NULL; |
| 960 | return ret; |
| 961 | } |
| 962 | |
| 963 | return 0; |
| 964 | } |
| 965 | |
| 966 | /* |
| 967 | * Recover a metadata set. |
| 968 | */ |
| 969 | static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set) |
| 970 | { |
| 971 | unsigned int src_set = dst_set ^ 0x1; |
| 972 | struct page *page; |
| 973 | int i, ret; |
| 974 | |
| 975 | dmz_dev_warn(zmd->dev, "Metadata set %u invalid: recovering", dst_set); |
| 976 | |
| 977 | if (dst_set == 0) |
| 978 | zmd->sb[0].block = dmz_start_block(zmd, zmd->sb_zone); |
| 979 | else { |
| 980 | zmd->sb[1].block = zmd->sb[0].block + |
| 981 | (zmd->nr_meta_zones << zmd->dev->zone_nr_blocks_shift); |
| 982 | } |
| 983 | |
Damien Le Moal | 4218a95 | 2017-07-24 16:44:37 +0900 | [diff] [blame] | 984 | page = alloc_page(GFP_NOIO); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 985 | if (!page) |
| 986 | return -ENOMEM; |
| 987 | |
| 988 | /* Copy metadata blocks */ |
| 989 | for (i = 1; i < zmd->nr_meta_blocks; i++) { |
| 990 | ret = dmz_rdwr_block(zmd, REQ_OP_READ, |
| 991 | zmd->sb[src_set].block + i, page); |
| 992 | if (ret) |
| 993 | goto out; |
| 994 | ret = dmz_rdwr_block(zmd, REQ_OP_WRITE, |
| 995 | zmd->sb[dst_set].block + i, page); |
| 996 | if (ret) |
| 997 | goto out; |
| 998 | } |
| 999 | |
| 1000 | /* Finalize with the super block */ |
| 1001 | if (!zmd->sb[dst_set].mblk) { |
| 1002 | zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0); |
| 1003 | if (!zmd->sb[dst_set].mblk) { |
| 1004 | ret = -ENOMEM; |
| 1005 | goto out; |
| 1006 | } |
| 1007 | zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data; |
| 1008 | } |
| 1009 | |
| 1010 | ret = dmz_write_sb(zmd, dst_set); |
| 1011 | out: |
| 1012 | __free_pages(page, 0); |
| 1013 | |
| 1014 | return ret; |
| 1015 | } |
| 1016 | |
| 1017 | /* |
| 1018 | * Get super block from disk. |
| 1019 | */ |
| 1020 | static int dmz_load_sb(struct dmz_metadata *zmd) |
| 1021 | { |
| 1022 | bool sb_good[2] = {false, false}; |
| 1023 | u64 sb_gen[2] = {0, 0}; |
| 1024 | int ret; |
| 1025 | |
| 1026 | /* Read and check the primary super block */ |
| 1027 | zmd->sb[0].block = dmz_start_block(zmd, zmd->sb_zone); |
| 1028 | ret = dmz_get_sb(zmd, 0); |
| 1029 | if (ret) { |
| 1030 | dmz_dev_err(zmd->dev, "Read primary super block failed"); |
| 1031 | return ret; |
| 1032 | } |
| 1033 | |
| 1034 | ret = dmz_check_sb(zmd, zmd->sb[0].sb); |
| 1035 | |
| 1036 | /* Read and check secondary super block */ |
| 1037 | if (ret == 0) { |
| 1038 | sb_good[0] = true; |
| 1039 | zmd->sb[1].block = zmd->sb[0].block + |
| 1040 | (zmd->nr_meta_zones << zmd->dev->zone_nr_blocks_shift); |
| 1041 | ret = dmz_get_sb(zmd, 1); |
| 1042 | } else |
| 1043 | ret = dmz_lookup_secondary_sb(zmd); |
| 1044 | |
| 1045 | if (ret) { |
| 1046 | dmz_dev_err(zmd->dev, "Read secondary super block failed"); |
| 1047 | return ret; |
| 1048 | } |
| 1049 | |
| 1050 | ret = dmz_check_sb(zmd, zmd->sb[1].sb); |
| 1051 | if (ret == 0) |
| 1052 | sb_good[1] = true; |
| 1053 | |
| 1054 | /* Use highest generation sb first */ |
| 1055 | if (!sb_good[0] && !sb_good[1]) { |
| 1056 | dmz_dev_err(zmd->dev, "No valid super block found"); |
| 1057 | return -EIO; |
| 1058 | } |
| 1059 | |
| 1060 | if (sb_good[0]) |
| 1061 | sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen); |
| 1062 | else |
| 1063 | ret = dmz_recover_mblocks(zmd, 0); |
| 1064 | |
| 1065 | if (sb_good[1]) |
| 1066 | sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen); |
| 1067 | else |
| 1068 | ret = dmz_recover_mblocks(zmd, 1); |
| 1069 | |
| 1070 | if (ret) { |
| 1071 | dmz_dev_err(zmd->dev, "Recovery failed"); |
| 1072 | return -EIO; |
| 1073 | } |
| 1074 | |
| 1075 | if (sb_gen[0] >= sb_gen[1]) { |
| 1076 | zmd->sb_gen = sb_gen[0]; |
| 1077 | zmd->mblk_primary = 0; |
| 1078 | } else { |
| 1079 | zmd->sb_gen = sb_gen[1]; |
| 1080 | zmd->mblk_primary = 1; |
| 1081 | } |
| 1082 | |
| 1083 | dmz_dev_debug(zmd->dev, "Using super block %u (gen %llu)", |
| 1084 | zmd->mblk_primary, zmd->sb_gen); |
| 1085 | |
| 1086 | return 0; |
| 1087 | } |
| 1088 | |
| 1089 | /* |
| 1090 | * Initialize a zone descriptor. |
| 1091 | */ |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1092 | static int dmz_init_zone(struct blk_zone *blkz, unsigned int idx, void *data) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1093 | { |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1094 | struct dmz_metadata *zmd = data; |
| 1095 | struct dm_zone *zone = &zmd->zones[idx]; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1096 | struct dmz_dev *dev = zmd->dev; |
| 1097 | |
| 1098 | /* Ignore the eventual last runt (smaller) zone */ |
| 1099 | if (blkz->len != dev->zone_nr_sectors) { |
| 1100 | if (blkz->start + blkz->len == dev->capacity) |
| 1101 | return 0; |
| 1102 | return -ENXIO; |
| 1103 | } |
| 1104 | |
| 1105 | INIT_LIST_HEAD(&zone->link); |
| 1106 | atomic_set(&zone->refcount, 0); |
| 1107 | zone->chunk = DMZ_MAP_UNMAPPED; |
| 1108 | |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1109 | switch (blkz->type) { |
| 1110 | case BLK_ZONE_TYPE_CONVENTIONAL: |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1111 | set_bit(DMZ_RND, &zone->flags); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1112 | break; |
| 1113 | case BLK_ZONE_TYPE_SEQWRITE_REQ: |
| 1114 | case BLK_ZONE_TYPE_SEQWRITE_PREF: |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1115 | set_bit(DMZ_SEQ, &zone->flags); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1116 | break; |
| 1117 | default: |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1118 | return -ENXIO; |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1119 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1120 | |
| 1121 | if (dmz_is_rnd(zone)) |
| 1122 | zone->wp_block = 0; |
| 1123 | else |
| 1124 | zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); |
| 1125 | |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1126 | if (blkz->cond == BLK_ZONE_COND_OFFLINE) |
| 1127 | set_bit(DMZ_OFFLINE, &zone->flags); |
| 1128 | else if (blkz->cond == BLK_ZONE_COND_READONLY) |
| 1129 | set_bit(DMZ_READ_ONLY, &zone->flags); |
| 1130 | else { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1131 | zmd->nr_useable_zones++; |
| 1132 | if (dmz_is_rnd(zone)) { |
| 1133 | zmd->nr_rnd_zones++; |
| 1134 | if (!zmd->sb_zone) { |
| 1135 | /* Super block zone */ |
| 1136 | zmd->sb_zone = zone; |
| 1137 | } |
| 1138 | } |
| 1139 | } |
| 1140 | |
| 1141 | return 0; |
| 1142 | } |
| 1143 | |
| 1144 | /* |
| 1145 | * Free zones descriptors. |
| 1146 | */ |
| 1147 | static void dmz_drop_zones(struct dmz_metadata *zmd) |
| 1148 | { |
| 1149 | kfree(zmd->zones); |
| 1150 | zmd->zones = NULL; |
| 1151 | } |
| 1152 | |
| 1153 | /* |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1154 | * Allocate and initialize zone descriptors using the zone |
| 1155 | * information from disk. |
| 1156 | */ |
| 1157 | static int dmz_init_zones(struct dmz_metadata *zmd) |
| 1158 | { |
| 1159 | struct dmz_dev *dev = zmd->dev; |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1160 | int ret; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1161 | |
| 1162 | /* Init */ |
| 1163 | zmd->zone_bitmap_size = dev->zone_nr_blocks >> 3; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 1164 | zmd->zone_nr_bitmap_blocks = |
| 1165 | max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT); |
| 1166 | zmd->zone_bits_per_mblk = min_t(sector_t, dev->zone_nr_blocks, |
| 1167 | DMZ_BLOCK_SIZE_BITS); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1168 | |
| 1169 | /* Allocate zone array */ |
| 1170 | zmd->zones = kcalloc(dev->nr_zones, sizeof(struct dm_zone), GFP_KERNEL); |
| 1171 | if (!zmd->zones) |
| 1172 | return -ENOMEM; |
| 1173 | |
| 1174 | dmz_dev_info(dev, "Using %zu B for zone information", |
| 1175 | sizeof(struct dm_zone) * dev->nr_zones); |
| 1176 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1177 | /* |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1178 | * Get zone information and initialize zone descriptors. At the same |
| 1179 | * time, determine where the super block should be: first block of the |
| 1180 | * first randomly writable zone. |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1181 | */ |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1182 | ret = blkdev_report_zones(dev->bdev, 0, BLK_ALL_ZONES, dmz_init_zone, |
| 1183 | zmd); |
| 1184 | if (ret < 0) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1185 | dmz_drop_zones(zmd); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1186 | return ret; |
| 1187 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1188 | |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1189 | return 0; |
| 1190 | } |
| 1191 | |
| 1192 | static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx, |
| 1193 | void *data) |
| 1194 | { |
| 1195 | struct dm_zone *zone = data; |
| 1196 | |
| 1197 | clear_bit(DMZ_OFFLINE, &zone->flags); |
| 1198 | clear_bit(DMZ_READ_ONLY, &zone->flags); |
| 1199 | if (blkz->cond == BLK_ZONE_COND_OFFLINE) |
| 1200 | set_bit(DMZ_OFFLINE, &zone->flags); |
| 1201 | else if (blkz->cond == BLK_ZONE_COND_READONLY) |
| 1202 | set_bit(DMZ_READ_ONLY, &zone->flags); |
| 1203 | |
| 1204 | if (dmz_is_seq(zone)) |
| 1205 | zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); |
| 1206 | else |
| 1207 | zone->wp_block = 0; |
| 1208 | return 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1209 | } |
| 1210 | |
| 1211 | /* |
| 1212 | * Update a zone information. |
| 1213 | */ |
| 1214 | static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1215 | { |
Damien Le Moal | bd976e5 | 2019-07-01 14:09:16 +0900 | [diff] [blame] | 1216 | unsigned int noio_flag; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1217 | int ret; |
| 1218 | |
Damien Le Moal | bd976e5 | 2019-07-01 14:09:16 +0900 | [diff] [blame] | 1219 | /* |
| 1220 | * Get zone information from disk. Since blkdev_report_zones() uses |
| 1221 | * GFP_KERNEL by default for memory allocations, set the per-task |
| 1222 | * PF_MEMALLOC_NOIO flag so that all allocations are done as if |
| 1223 | * GFP_NOIO was specified. |
| 1224 | */ |
| 1225 | noio_flag = memalloc_noio_save(); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1226 | ret = blkdev_report_zones(zmd->dev->bdev, dmz_start_sect(zmd, zone), 1, |
| 1227 | dmz_update_zone_cb, zone); |
Damien Le Moal | bd976e5 | 2019-07-01 14:09:16 +0900 | [diff] [blame] | 1228 | memalloc_noio_restore(noio_flag); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1229 | |
| 1230 | if (ret == 0) |
Damien Le Moal | 7aedf75 | 2019-04-18 18:03:07 +0900 | [diff] [blame] | 1231 | ret = -EIO; |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1232 | if (ret < 0) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1233 | dmz_dev_err(zmd->dev, "Get zone %u report failed", |
| 1234 | dmz_id(zmd, zone)); |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 1235 | dmz_check_bdev(zmd->dev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1236 | return ret; |
| 1237 | } |
| 1238 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1239 | return 0; |
| 1240 | } |
| 1241 | |
| 1242 | /* |
| 1243 | * Check a zone write pointer position when the zone is marked |
| 1244 | * with the sequential write error flag. |
| 1245 | */ |
| 1246 | static int dmz_handle_seq_write_err(struct dmz_metadata *zmd, |
| 1247 | struct dm_zone *zone) |
| 1248 | { |
| 1249 | unsigned int wp = 0; |
| 1250 | int ret; |
| 1251 | |
| 1252 | wp = zone->wp_block; |
| 1253 | ret = dmz_update_zone(zmd, zone); |
| 1254 | if (ret) |
| 1255 | return ret; |
| 1256 | |
| 1257 | dmz_dev_warn(zmd->dev, "Processing zone %u write error (zone wp %u/%u)", |
| 1258 | dmz_id(zmd, zone), zone->wp_block, wp); |
| 1259 | |
| 1260 | if (zone->wp_block < wp) { |
| 1261 | dmz_invalidate_blocks(zmd, zone, zone->wp_block, |
| 1262 | wp - zone->wp_block); |
| 1263 | } |
| 1264 | |
| 1265 | return 0; |
| 1266 | } |
| 1267 | |
| 1268 | static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id) |
| 1269 | { |
| 1270 | return &zmd->zones[zone_id]; |
| 1271 | } |
| 1272 | |
| 1273 | /* |
| 1274 | * Reset a zone write pointer. |
| 1275 | */ |
| 1276 | static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1277 | { |
| 1278 | int ret; |
| 1279 | |
| 1280 | /* |
| 1281 | * Ignore offline zones, read only zones, |
| 1282 | * and conventional zones. |
| 1283 | */ |
| 1284 | if (dmz_is_offline(zone) || |
| 1285 | dmz_is_readonly(zone) || |
| 1286 | dmz_is_rnd(zone)) |
| 1287 | return 0; |
| 1288 | |
| 1289 | if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) { |
| 1290 | struct dmz_dev *dev = zmd->dev; |
| 1291 | |
Ajay Joshi | 6c1b1da | 2019-10-27 23:05:45 +0900 | [diff] [blame] | 1292 | ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET, |
| 1293 | dmz_start_sect(zmd, zone), |
| 1294 | dev->zone_nr_sectors, GFP_NOIO); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1295 | if (ret) { |
| 1296 | dmz_dev_err(dev, "Reset zone %u failed %d", |
| 1297 | dmz_id(zmd, zone), ret); |
| 1298 | return ret; |
| 1299 | } |
| 1300 | } |
| 1301 | |
| 1302 | /* Clear write error bit and rewind write pointer position */ |
| 1303 | clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags); |
| 1304 | zone->wp_block = 0; |
| 1305 | |
| 1306 | return 0; |
| 1307 | } |
| 1308 | |
| 1309 | static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone); |
| 1310 | |
| 1311 | /* |
| 1312 | * Initialize chunk mapping. |
| 1313 | */ |
| 1314 | static int dmz_load_mapping(struct dmz_metadata *zmd) |
| 1315 | { |
| 1316 | struct dmz_dev *dev = zmd->dev; |
| 1317 | struct dm_zone *dzone, *bzone; |
| 1318 | struct dmz_mblock *dmap_mblk = NULL; |
| 1319 | struct dmz_map *dmap; |
| 1320 | unsigned int i = 0, e = 0, chunk = 0; |
| 1321 | unsigned int dzone_id; |
| 1322 | unsigned int bzone_id; |
| 1323 | |
| 1324 | /* Metadata block array for the chunk mapping table */ |
| 1325 | zmd->map_mblk = kcalloc(zmd->nr_map_blocks, |
| 1326 | sizeof(struct dmz_mblk *), GFP_KERNEL); |
| 1327 | if (!zmd->map_mblk) |
| 1328 | return -ENOMEM; |
| 1329 | |
| 1330 | /* Get chunk mapping table blocks and initialize zone mapping */ |
| 1331 | while (chunk < zmd->nr_chunks) { |
| 1332 | if (!dmap_mblk) { |
| 1333 | /* Get mapping block */ |
| 1334 | dmap_mblk = dmz_get_mblock(zmd, i + 1); |
| 1335 | if (IS_ERR(dmap_mblk)) |
| 1336 | return PTR_ERR(dmap_mblk); |
| 1337 | zmd->map_mblk[i] = dmap_mblk; |
| 1338 | dmap = (struct dmz_map *) dmap_mblk->data; |
| 1339 | i++; |
| 1340 | e = 0; |
| 1341 | } |
| 1342 | |
| 1343 | /* Check data zone */ |
| 1344 | dzone_id = le32_to_cpu(dmap[e].dzone_id); |
| 1345 | if (dzone_id == DMZ_MAP_UNMAPPED) |
| 1346 | goto next; |
| 1347 | |
| 1348 | if (dzone_id >= dev->nr_zones) { |
| 1349 | dmz_dev_err(dev, "Chunk %u mapping: invalid data zone ID %u", |
| 1350 | chunk, dzone_id); |
| 1351 | return -EIO; |
| 1352 | } |
| 1353 | |
| 1354 | dzone = dmz_get(zmd, dzone_id); |
| 1355 | set_bit(DMZ_DATA, &dzone->flags); |
| 1356 | dzone->chunk = chunk; |
| 1357 | dmz_get_zone_weight(zmd, dzone); |
| 1358 | |
| 1359 | if (dmz_is_rnd(dzone)) |
| 1360 | list_add_tail(&dzone->link, &zmd->map_rnd_list); |
| 1361 | else |
| 1362 | list_add_tail(&dzone->link, &zmd->map_seq_list); |
| 1363 | |
| 1364 | /* Check buffer zone */ |
| 1365 | bzone_id = le32_to_cpu(dmap[e].bzone_id); |
| 1366 | if (bzone_id == DMZ_MAP_UNMAPPED) |
| 1367 | goto next; |
| 1368 | |
| 1369 | if (bzone_id >= dev->nr_zones) { |
| 1370 | dmz_dev_err(dev, "Chunk %u mapping: invalid buffer zone ID %u", |
| 1371 | chunk, bzone_id); |
| 1372 | return -EIO; |
| 1373 | } |
| 1374 | |
| 1375 | bzone = dmz_get(zmd, bzone_id); |
| 1376 | if (!dmz_is_rnd(bzone)) { |
| 1377 | dmz_dev_err(dev, "Chunk %u mapping: invalid buffer zone %u", |
| 1378 | chunk, bzone_id); |
| 1379 | return -EIO; |
| 1380 | } |
| 1381 | |
| 1382 | set_bit(DMZ_DATA, &bzone->flags); |
| 1383 | set_bit(DMZ_BUF, &bzone->flags); |
| 1384 | bzone->chunk = chunk; |
| 1385 | bzone->bzone = dzone; |
| 1386 | dzone->bzone = bzone; |
| 1387 | dmz_get_zone_weight(zmd, bzone); |
| 1388 | list_add_tail(&bzone->link, &zmd->map_rnd_list); |
| 1389 | next: |
| 1390 | chunk++; |
| 1391 | e++; |
| 1392 | if (e >= DMZ_MAP_ENTRIES) |
| 1393 | dmap_mblk = NULL; |
| 1394 | } |
| 1395 | |
| 1396 | /* |
| 1397 | * At this point, only meta zones and mapped data zones were |
| 1398 | * fully initialized. All remaining zones are unmapped data |
| 1399 | * zones. Finish initializing those here. |
| 1400 | */ |
| 1401 | for (i = 0; i < dev->nr_zones; i++) { |
| 1402 | dzone = dmz_get(zmd, i); |
| 1403 | if (dmz_is_meta(dzone)) |
| 1404 | continue; |
| 1405 | |
| 1406 | if (dmz_is_rnd(dzone)) |
| 1407 | zmd->nr_rnd++; |
| 1408 | else |
| 1409 | zmd->nr_seq++; |
| 1410 | |
| 1411 | if (dmz_is_data(dzone)) { |
| 1412 | /* Already initialized */ |
| 1413 | continue; |
| 1414 | } |
| 1415 | |
| 1416 | /* Unmapped data zone */ |
| 1417 | set_bit(DMZ_DATA, &dzone->flags); |
| 1418 | dzone->chunk = DMZ_MAP_UNMAPPED; |
| 1419 | if (dmz_is_rnd(dzone)) { |
| 1420 | list_add_tail(&dzone->link, &zmd->unmap_rnd_list); |
| 1421 | atomic_inc(&zmd->unmap_nr_rnd); |
| 1422 | } else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) { |
| 1423 | list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list); |
| 1424 | atomic_inc(&zmd->nr_reserved_seq_zones); |
| 1425 | zmd->nr_seq--; |
| 1426 | } else { |
| 1427 | list_add_tail(&dzone->link, &zmd->unmap_seq_list); |
| 1428 | atomic_inc(&zmd->unmap_nr_seq); |
| 1429 | } |
| 1430 | } |
| 1431 | |
| 1432 | return 0; |
| 1433 | } |
| 1434 | |
| 1435 | /* |
| 1436 | * Set a data chunk mapping. |
| 1437 | */ |
| 1438 | static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, |
| 1439 | unsigned int dzone_id, unsigned int bzone_id) |
| 1440 | { |
| 1441 | struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; |
| 1442 | struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; |
| 1443 | int map_idx = chunk & DMZ_MAP_ENTRIES_MASK; |
| 1444 | |
| 1445 | dmap[map_idx].dzone_id = cpu_to_le32(dzone_id); |
| 1446 | dmap[map_idx].bzone_id = cpu_to_le32(bzone_id); |
| 1447 | dmz_dirty_mblock(zmd, dmap_mblk); |
| 1448 | } |
| 1449 | |
| 1450 | /* |
| 1451 | * The list of mapped zones is maintained in LRU order. |
| 1452 | * This rotates a zone at the end of its map list. |
| 1453 | */ |
| 1454 | static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1455 | { |
| 1456 | if (list_empty(&zone->link)) |
| 1457 | return; |
| 1458 | |
| 1459 | list_del_init(&zone->link); |
| 1460 | if (dmz_is_seq(zone)) { |
| 1461 | /* LRU rotate sequential zone */ |
| 1462 | list_add_tail(&zone->link, &zmd->map_seq_list); |
| 1463 | } else { |
| 1464 | /* LRU rotate random zone */ |
| 1465 | list_add_tail(&zone->link, &zmd->map_rnd_list); |
| 1466 | } |
| 1467 | } |
| 1468 | |
| 1469 | /* |
| 1470 | * The list of mapped random zones is maintained |
| 1471 | * in LRU order. This rotates a zone at the end of the list. |
| 1472 | */ |
| 1473 | static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1474 | { |
| 1475 | __dmz_lru_zone(zmd, zone); |
| 1476 | if (zone->bzone) |
| 1477 | __dmz_lru_zone(zmd, zone->bzone); |
| 1478 | } |
| 1479 | |
| 1480 | /* |
| 1481 | * Wait for any zone to be freed. |
| 1482 | */ |
| 1483 | static void dmz_wait_for_free_zones(struct dmz_metadata *zmd) |
| 1484 | { |
| 1485 | DEFINE_WAIT(wait); |
| 1486 | |
| 1487 | prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE); |
| 1488 | dmz_unlock_map(zmd); |
| 1489 | dmz_unlock_metadata(zmd); |
| 1490 | |
| 1491 | io_schedule_timeout(HZ); |
| 1492 | |
| 1493 | dmz_lock_metadata(zmd); |
| 1494 | dmz_lock_map(zmd); |
| 1495 | finish_wait(&zmd->free_wq, &wait); |
| 1496 | } |
| 1497 | |
| 1498 | /* |
| 1499 | * Lock a zone for reclaim (set the zone RECLAIM bit). |
| 1500 | * Returns false if the zone cannot be locked or if it is already locked |
| 1501 | * and 1 otherwise. |
| 1502 | */ |
| 1503 | int dmz_lock_zone_reclaim(struct dm_zone *zone) |
| 1504 | { |
| 1505 | /* Active zones cannot be reclaimed */ |
| 1506 | if (dmz_is_active(zone)) |
| 1507 | return 0; |
| 1508 | |
| 1509 | return !test_and_set_bit(DMZ_RECLAIM, &zone->flags); |
| 1510 | } |
| 1511 | |
| 1512 | /* |
| 1513 | * Clear a zone reclaim flag. |
| 1514 | */ |
| 1515 | void dmz_unlock_zone_reclaim(struct dm_zone *zone) |
| 1516 | { |
| 1517 | WARN_ON(dmz_is_active(zone)); |
| 1518 | WARN_ON(!dmz_in_reclaim(zone)); |
| 1519 | |
| 1520 | clear_bit_unlock(DMZ_RECLAIM, &zone->flags); |
| 1521 | smp_mb__after_atomic(); |
| 1522 | wake_up_bit(&zone->flags, DMZ_RECLAIM); |
| 1523 | } |
| 1524 | |
| 1525 | /* |
| 1526 | * Wait for a zone reclaim to complete. |
| 1527 | */ |
| 1528 | static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1529 | { |
| 1530 | dmz_unlock_map(zmd); |
| 1531 | dmz_unlock_metadata(zmd); |
| 1532 | wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ); |
| 1533 | dmz_lock_metadata(zmd); |
| 1534 | dmz_lock_map(zmd); |
| 1535 | } |
| 1536 | |
| 1537 | /* |
| 1538 | * Select a random write zone for reclaim. |
| 1539 | */ |
| 1540 | static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd) |
| 1541 | { |
| 1542 | struct dm_zone *dzone = NULL; |
| 1543 | struct dm_zone *zone; |
| 1544 | |
| 1545 | if (list_empty(&zmd->map_rnd_list)) |
Dmitry Fomichev | b234c6d | 2019-08-10 14:43:09 -0700 | [diff] [blame] | 1546 | return ERR_PTR(-EBUSY); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1547 | |
| 1548 | list_for_each_entry(zone, &zmd->map_rnd_list, link) { |
| 1549 | if (dmz_is_buf(zone)) |
| 1550 | dzone = zone->bzone; |
| 1551 | else |
| 1552 | dzone = zone; |
| 1553 | if (dmz_lock_zone_reclaim(dzone)) |
| 1554 | return dzone; |
| 1555 | } |
| 1556 | |
Dmitry Fomichev | b234c6d | 2019-08-10 14:43:09 -0700 | [diff] [blame] | 1557 | return ERR_PTR(-EBUSY); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1558 | } |
| 1559 | |
| 1560 | /* |
| 1561 | * Select a buffered sequential zone for reclaim. |
| 1562 | */ |
| 1563 | static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd) |
| 1564 | { |
| 1565 | struct dm_zone *zone; |
| 1566 | |
| 1567 | if (list_empty(&zmd->map_seq_list)) |
Dan Carpenter | e0702d9 | 2019-08-19 12:58:14 +0300 | [diff] [blame] | 1568 | return ERR_PTR(-EBUSY); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1569 | |
| 1570 | list_for_each_entry(zone, &zmd->map_seq_list, link) { |
| 1571 | if (!zone->bzone) |
| 1572 | continue; |
| 1573 | if (dmz_lock_zone_reclaim(zone)) |
| 1574 | return zone; |
| 1575 | } |
| 1576 | |
Dan Carpenter | e0702d9 | 2019-08-19 12:58:14 +0300 | [diff] [blame] | 1577 | return ERR_PTR(-EBUSY); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1578 | } |
| 1579 | |
| 1580 | /* |
| 1581 | * Select a zone for reclaim. |
| 1582 | */ |
| 1583 | struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd) |
| 1584 | { |
| 1585 | struct dm_zone *zone; |
| 1586 | |
| 1587 | /* |
| 1588 | * Search for a zone candidate to reclaim: 2 cases are possible. |
| 1589 | * (1) There is no free sequential zones. Then a random data zone |
| 1590 | * cannot be reclaimed. So choose a sequential zone to reclaim so |
| 1591 | * that afterward a random zone can be reclaimed. |
| 1592 | * (2) At least one free sequential zone is available, then choose |
| 1593 | * the oldest random zone (data or buffer) that can be locked. |
| 1594 | */ |
| 1595 | dmz_lock_map(zmd); |
| 1596 | if (list_empty(&zmd->reserved_seq_zones_list)) |
| 1597 | zone = dmz_get_seq_zone_for_reclaim(zmd); |
| 1598 | else |
| 1599 | zone = dmz_get_rnd_zone_for_reclaim(zmd); |
| 1600 | dmz_unlock_map(zmd); |
| 1601 | |
| 1602 | return zone; |
| 1603 | } |
| 1604 | |
| 1605 | /* |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1606 | * Get the zone mapping a chunk, if the chunk is mapped already. |
| 1607 | * If no mapping exist and the operation is WRITE, a zone is |
| 1608 | * allocated and used to map the chunk. |
| 1609 | * The zone returned will be set to the active state. |
| 1610 | */ |
| 1611 | struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op) |
| 1612 | { |
| 1613 | struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; |
| 1614 | struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; |
| 1615 | int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK; |
| 1616 | unsigned int dzone_id; |
| 1617 | struct dm_zone *dzone = NULL; |
| 1618 | int ret = 0; |
| 1619 | |
| 1620 | dmz_lock_map(zmd); |
| 1621 | again: |
| 1622 | /* Get the chunk mapping */ |
| 1623 | dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id); |
| 1624 | if (dzone_id == DMZ_MAP_UNMAPPED) { |
| 1625 | /* |
| 1626 | * Read or discard in unmapped chunks are fine. But for |
| 1627 | * writes, we need a mapping, so get one. |
| 1628 | */ |
| 1629 | if (op != REQ_OP_WRITE) |
| 1630 | goto out; |
| 1631 | |
Dmitry Fomichev | ad1bd57 | 2019-08-02 15:02:51 -0700 | [diff] [blame] | 1632 | /* Allocate a random zone */ |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1633 | dzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND); |
| 1634 | if (!dzone) { |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 1635 | if (dmz_bdev_is_dying(zmd->dev)) { |
| 1636 | dzone = ERR_PTR(-EIO); |
| 1637 | goto out; |
| 1638 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1639 | dmz_wait_for_free_zones(zmd); |
| 1640 | goto again; |
| 1641 | } |
| 1642 | |
| 1643 | dmz_map_zone(zmd, dzone, chunk); |
| 1644 | |
| 1645 | } else { |
| 1646 | /* The chunk is already mapped: get the mapping zone */ |
| 1647 | dzone = dmz_get(zmd, dzone_id); |
| 1648 | if (dzone->chunk != chunk) { |
| 1649 | dzone = ERR_PTR(-EIO); |
| 1650 | goto out; |
| 1651 | } |
| 1652 | |
| 1653 | /* Repair write pointer if the sequential dzone has error */ |
| 1654 | if (dmz_seq_write_err(dzone)) { |
| 1655 | ret = dmz_handle_seq_write_err(zmd, dzone); |
| 1656 | if (ret) { |
| 1657 | dzone = ERR_PTR(-EIO); |
| 1658 | goto out; |
| 1659 | } |
| 1660 | clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags); |
| 1661 | } |
| 1662 | } |
| 1663 | |
| 1664 | /* |
| 1665 | * If the zone is being reclaimed, the chunk mapping may change |
| 1666 | * to a different zone. So wait for reclaim and retry. Otherwise, |
| 1667 | * activate the zone (this will prevent reclaim from touching it). |
| 1668 | */ |
| 1669 | if (dmz_in_reclaim(dzone)) { |
| 1670 | dmz_wait_for_reclaim(zmd, dzone); |
| 1671 | goto again; |
| 1672 | } |
| 1673 | dmz_activate_zone(dzone); |
| 1674 | dmz_lru_zone(zmd, dzone); |
| 1675 | out: |
| 1676 | dmz_unlock_map(zmd); |
| 1677 | |
| 1678 | return dzone; |
| 1679 | } |
| 1680 | |
| 1681 | /* |
| 1682 | * Write and discard change the block validity of data zones and their buffer |
| 1683 | * zones. Check here that valid blocks are still present. If all blocks are |
| 1684 | * invalid, the zones can be unmapped on the fly without waiting for reclaim |
| 1685 | * to do it. |
| 1686 | */ |
| 1687 | void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone) |
| 1688 | { |
| 1689 | struct dm_zone *bzone; |
| 1690 | |
| 1691 | dmz_lock_map(zmd); |
| 1692 | |
| 1693 | bzone = dzone->bzone; |
| 1694 | if (bzone) { |
| 1695 | if (dmz_weight(bzone)) |
| 1696 | dmz_lru_zone(zmd, bzone); |
| 1697 | else { |
| 1698 | /* Empty buffer zone: reclaim it */ |
| 1699 | dmz_unmap_zone(zmd, bzone); |
| 1700 | dmz_free_zone(zmd, bzone); |
| 1701 | bzone = NULL; |
| 1702 | } |
| 1703 | } |
| 1704 | |
| 1705 | /* Deactivate the data zone */ |
| 1706 | dmz_deactivate_zone(dzone); |
| 1707 | if (dmz_is_active(dzone) || bzone || dmz_weight(dzone)) |
| 1708 | dmz_lru_zone(zmd, dzone); |
| 1709 | else { |
| 1710 | /* Unbuffered inactive empty data zone: reclaim it */ |
| 1711 | dmz_unmap_zone(zmd, dzone); |
| 1712 | dmz_free_zone(zmd, dzone); |
| 1713 | } |
| 1714 | |
| 1715 | dmz_unlock_map(zmd); |
| 1716 | } |
| 1717 | |
| 1718 | /* |
| 1719 | * Allocate and map a random zone to buffer a chunk |
| 1720 | * already mapped to a sequential zone. |
| 1721 | */ |
| 1722 | struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd, |
| 1723 | struct dm_zone *dzone) |
| 1724 | { |
| 1725 | struct dm_zone *bzone; |
| 1726 | |
| 1727 | dmz_lock_map(zmd); |
| 1728 | again: |
| 1729 | bzone = dzone->bzone; |
| 1730 | if (bzone) |
| 1731 | goto out; |
| 1732 | |
Dmitry Fomichev | ad1bd57 | 2019-08-02 15:02:51 -0700 | [diff] [blame] | 1733 | /* Allocate a random zone */ |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1734 | bzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND); |
| 1735 | if (!bzone) { |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 1736 | if (dmz_bdev_is_dying(zmd->dev)) { |
| 1737 | bzone = ERR_PTR(-EIO); |
| 1738 | goto out; |
| 1739 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1740 | dmz_wait_for_free_zones(zmd); |
| 1741 | goto again; |
| 1742 | } |
| 1743 | |
| 1744 | /* Update the chunk mapping */ |
| 1745 | dmz_set_chunk_mapping(zmd, dzone->chunk, dmz_id(zmd, dzone), |
| 1746 | dmz_id(zmd, bzone)); |
| 1747 | |
| 1748 | set_bit(DMZ_BUF, &bzone->flags); |
| 1749 | bzone->chunk = dzone->chunk; |
| 1750 | bzone->bzone = dzone; |
| 1751 | dzone->bzone = bzone; |
| 1752 | list_add_tail(&bzone->link, &zmd->map_rnd_list); |
| 1753 | out: |
| 1754 | dmz_unlock_map(zmd); |
| 1755 | |
| 1756 | return bzone; |
| 1757 | } |
| 1758 | |
| 1759 | /* |
| 1760 | * Get an unmapped (free) zone. |
| 1761 | * This must be called with the mapping lock held. |
| 1762 | */ |
| 1763 | struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags) |
| 1764 | { |
| 1765 | struct list_head *list; |
| 1766 | struct dm_zone *zone; |
| 1767 | |
| 1768 | if (flags & DMZ_ALLOC_RND) |
| 1769 | list = &zmd->unmap_rnd_list; |
| 1770 | else |
| 1771 | list = &zmd->unmap_seq_list; |
| 1772 | again: |
| 1773 | if (list_empty(list)) { |
| 1774 | /* |
| 1775 | * No free zone: if this is for reclaim, allow using the |
| 1776 | * reserved sequential zones. |
| 1777 | */ |
| 1778 | if (!(flags & DMZ_ALLOC_RECLAIM) || |
| 1779 | list_empty(&zmd->reserved_seq_zones_list)) |
| 1780 | return NULL; |
| 1781 | |
| 1782 | zone = list_first_entry(&zmd->reserved_seq_zones_list, |
| 1783 | struct dm_zone, link); |
| 1784 | list_del_init(&zone->link); |
| 1785 | atomic_dec(&zmd->nr_reserved_seq_zones); |
| 1786 | return zone; |
| 1787 | } |
| 1788 | |
| 1789 | zone = list_first_entry(list, struct dm_zone, link); |
| 1790 | list_del_init(&zone->link); |
| 1791 | |
| 1792 | if (dmz_is_rnd(zone)) |
| 1793 | atomic_dec(&zmd->unmap_nr_rnd); |
| 1794 | else |
| 1795 | atomic_dec(&zmd->unmap_nr_seq); |
| 1796 | |
| 1797 | if (dmz_is_offline(zone)) { |
| 1798 | dmz_dev_warn(zmd->dev, "Zone %u is offline", dmz_id(zmd, zone)); |
| 1799 | zone = NULL; |
| 1800 | goto again; |
| 1801 | } |
| 1802 | |
| 1803 | return zone; |
| 1804 | } |
| 1805 | |
| 1806 | /* |
| 1807 | * Free a zone. |
| 1808 | * This must be called with the mapping lock held. |
| 1809 | */ |
| 1810 | void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1811 | { |
| 1812 | /* If this is a sequential zone, reset it */ |
| 1813 | if (dmz_is_seq(zone)) |
| 1814 | dmz_reset_zone(zmd, zone); |
| 1815 | |
| 1816 | /* Return the zone to its type unmap list */ |
| 1817 | if (dmz_is_rnd(zone)) { |
| 1818 | list_add_tail(&zone->link, &zmd->unmap_rnd_list); |
| 1819 | atomic_inc(&zmd->unmap_nr_rnd); |
| 1820 | } else if (atomic_read(&zmd->nr_reserved_seq_zones) < |
| 1821 | zmd->nr_reserved_seq) { |
| 1822 | list_add_tail(&zone->link, &zmd->reserved_seq_zones_list); |
| 1823 | atomic_inc(&zmd->nr_reserved_seq_zones); |
| 1824 | } else { |
| 1825 | list_add_tail(&zone->link, &zmd->unmap_seq_list); |
| 1826 | atomic_inc(&zmd->unmap_nr_seq); |
| 1827 | } |
| 1828 | |
| 1829 | wake_up_all(&zmd->free_wq); |
| 1830 | } |
| 1831 | |
| 1832 | /* |
| 1833 | * Map a chunk to a zone. |
| 1834 | * This must be called with the mapping lock held. |
| 1835 | */ |
| 1836 | void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone, |
| 1837 | unsigned int chunk) |
| 1838 | { |
| 1839 | /* Set the chunk mapping */ |
| 1840 | dmz_set_chunk_mapping(zmd, chunk, dmz_id(zmd, dzone), |
| 1841 | DMZ_MAP_UNMAPPED); |
| 1842 | dzone->chunk = chunk; |
| 1843 | if (dmz_is_rnd(dzone)) |
| 1844 | list_add_tail(&dzone->link, &zmd->map_rnd_list); |
| 1845 | else |
| 1846 | list_add_tail(&dzone->link, &zmd->map_seq_list); |
| 1847 | } |
| 1848 | |
| 1849 | /* |
| 1850 | * Unmap a zone. |
| 1851 | * This must be called with the mapping lock held. |
| 1852 | */ |
| 1853 | void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1854 | { |
| 1855 | unsigned int chunk = zone->chunk; |
| 1856 | unsigned int dzone_id; |
| 1857 | |
| 1858 | if (chunk == DMZ_MAP_UNMAPPED) { |
| 1859 | /* Already unmapped */ |
| 1860 | return; |
| 1861 | } |
| 1862 | |
| 1863 | if (test_and_clear_bit(DMZ_BUF, &zone->flags)) { |
| 1864 | /* |
| 1865 | * Unmapping the chunk buffer zone: clear only |
| 1866 | * the chunk buffer mapping |
| 1867 | */ |
| 1868 | dzone_id = dmz_id(zmd, zone->bzone); |
| 1869 | zone->bzone->bzone = NULL; |
| 1870 | zone->bzone = NULL; |
| 1871 | |
| 1872 | } else { |
| 1873 | /* |
| 1874 | * Unmapping the chunk data zone: the zone must |
| 1875 | * not be buffered. |
| 1876 | */ |
| 1877 | if (WARN_ON(zone->bzone)) { |
| 1878 | zone->bzone->bzone = NULL; |
| 1879 | zone->bzone = NULL; |
| 1880 | } |
| 1881 | dzone_id = DMZ_MAP_UNMAPPED; |
| 1882 | } |
| 1883 | |
| 1884 | dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED); |
| 1885 | |
| 1886 | zone->chunk = DMZ_MAP_UNMAPPED; |
| 1887 | list_del_init(&zone->link); |
| 1888 | } |
| 1889 | |
| 1890 | /* |
| 1891 | * Set @nr_bits bits in @bitmap starting from @bit. |
| 1892 | * Return the number of bits changed from 0 to 1. |
| 1893 | */ |
| 1894 | static unsigned int dmz_set_bits(unsigned long *bitmap, |
| 1895 | unsigned int bit, unsigned int nr_bits) |
| 1896 | { |
| 1897 | unsigned long *addr; |
| 1898 | unsigned int end = bit + nr_bits; |
| 1899 | unsigned int n = 0; |
| 1900 | |
| 1901 | while (bit < end) { |
| 1902 | if (((bit & (BITS_PER_LONG - 1)) == 0) && |
| 1903 | ((end - bit) >= BITS_PER_LONG)) { |
| 1904 | /* Try to set the whole word at once */ |
| 1905 | addr = bitmap + BIT_WORD(bit); |
| 1906 | if (*addr == 0) { |
| 1907 | *addr = ULONG_MAX; |
| 1908 | n += BITS_PER_LONG; |
| 1909 | bit += BITS_PER_LONG; |
| 1910 | continue; |
| 1911 | } |
| 1912 | } |
| 1913 | |
| 1914 | if (!test_and_set_bit(bit, bitmap)) |
| 1915 | n++; |
| 1916 | bit++; |
| 1917 | } |
| 1918 | |
| 1919 | return n; |
| 1920 | } |
| 1921 | |
| 1922 | /* |
| 1923 | * Get the bitmap block storing the bit for chunk_block in zone. |
| 1924 | */ |
| 1925 | static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd, |
| 1926 | struct dm_zone *zone, |
| 1927 | sector_t chunk_block) |
| 1928 | { |
| 1929 | sector_t bitmap_block = 1 + zmd->nr_map_blocks + |
| 1930 | (sector_t)(dmz_id(zmd, zone) * zmd->zone_nr_bitmap_blocks) + |
| 1931 | (chunk_block >> DMZ_BLOCK_SHIFT_BITS); |
| 1932 | |
| 1933 | return dmz_get_mblock(zmd, bitmap_block); |
| 1934 | } |
| 1935 | |
| 1936 | /* |
| 1937 | * Copy the valid blocks bitmap of from_zone to the bitmap of to_zone. |
| 1938 | */ |
| 1939 | int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, |
| 1940 | struct dm_zone *to_zone) |
| 1941 | { |
| 1942 | struct dmz_mblock *from_mblk, *to_mblk; |
| 1943 | sector_t chunk_block = 0; |
| 1944 | |
| 1945 | /* Get the zones bitmap blocks */ |
| 1946 | while (chunk_block < zmd->dev->zone_nr_blocks) { |
| 1947 | from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block); |
| 1948 | if (IS_ERR(from_mblk)) |
| 1949 | return PTR_ERR(from_mblk); |
| 1950 | to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block); |
| 1951 | if (IS_ERR(to_mblk)) { |
| 1952 | dmz_release_mblock(zmd, from_mblk); |
| 1953 | return PTR_ERR(to_mblk); |
| 1954 | } |
| 1955 | |
| 1956 | memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE); |
| 1957 | dmz_dirty_mblock(zmd, to_mblk); |
| 1958 | |
| 1959 | dmz_release_mblock(zmd, to_mblk); |
| 1960 | dmz_release_mblock(zmd, from_mblk); |
| 1961 | |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 1962 | chunk_block += zmd->zone_bits_per_mblk; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1963 | } |
| 1964 | |
| 1965 | to_zone->weight = from_zone->weight; |
| 1966 | |
| 1967 | return 0; |
| 1968 | } |
| 1969 | |
| 1970 | /* |
| 1971 | * Merge the valid blocks bitmap of from_zone into the bitmap of to_zone, |
| 1972 | * starting from chunk_block. |
| 1973 | */ |
| 1974 | int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, |
| 1975 | struct dm_zone *to_zone, sector_t chunk_block) |
| 1976 | { |
| 1977 | unsigned int nr_blocks; |
| 1978 | int ret; |
| 1979 | |
| 1980 | /* Get the zones bitmap blocks */ |
| 1981 | while (chunk_block < zmd->dev->zone_nr_blocks) { |
| 1982 | /* Get a valid region from the source zone */ |
| 1983 | ret = dmz_first_valid_block(zmd, from_zone, &chunk_block); |
| 1984 | if (ret <= 0) |
| 1985 | return ret; |
| 1986 | |
| 1987 | nr_blocks = ret; |
| 1988 | ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks); |
| 1989 | if (ret) |
| 1990 | return ret; |
| 1991 | |
| 1992 | chunk_block += nr_blocks; |
| 1993 | } |
| 1994 | |
| 1995 | return 0; |
| 1996 | } |
| 1997 | |
| 1998 | /* |
| 1999 | * Validate all the blocks in the range [block..block+nr_blocks-1]. |
| 2000 | */ |
| 2001 | int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2002 | sector_t chunk_block, unsigned int nr_blocks) |
| 2003 | { |
| 2004 | unsigned int count, bit, nr_bits; |
| 2005 | unsigned int zone_nr_blocks = zmd->dev->zone_nr_blocks; |
| 2006 | struct dmz_mblock *mblk; |
| 2007 | unsigned int n = 0; |
| 2008 | |
| 2009 | dmz_dev_debug(zmd->dev, "=> VALIDATE zone %u, block %llu, %u blocks", |
| 2010 | dmz_id(zmd, zone), (unsigned long long)chunk_block, |
| 2011 | nr_blocks); |
| 2012 | |
| 2013 | WARN_ON(chunk_block + nr_blocks > zone_nr_blocks); |
| 2014 | |
| 2015 | while (nr_blocks) { |
| 2016 | /* Get bitmap block */ |
| 2017 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); |
| 2018 | if (IS_ERR(mblk)) |
| 2019 | return PTR_ERR(mblk); |
| 2020 | |
| 2021 | /* Set bits */ |
| 2022 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2023 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2024 | |
| 2025 | count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits); |
| 2026 | if (count) { |
| 2027 | dmz_dirty_mblock(zmd, mblk); |
| 2028 | n += count; |
| 2029 | } |
| 2030 | dmz_release_mblock(zmd, mblk); |
| 2031 | |
| 2032 | nr_blocks -= nr_bits; |
| 2033 | chunk_block += nr_bits; |
| 2034 | } |
| 2035 | |
| 2036 | if (likely(zone->weight + n <= zone_nr_blocks)) |
| 2037 | zone->weight += n; |
| 2038 | else { |
| 2039 | dmz_dev_warn(zmd->dev, "Zone %u: weight %u should be <= %u", |
| 2040 | dmz_id(zmd, zone), zone->weight, |
| 2041 | zone_nr_blocks - n); |
| 2042 | zone->weight = zone_nr_blocks; |
| 2043 | } |
| 2044 | |
| 2045 | return 0; |
| 2046 | } |
| 2047 | |
| 2048 | /* |
| 2049 | * Clear nr_bits bits in bitmap starting from bit. |
| 2050 | * Return the number of bits cleared. |
| 2051 | */ |
| 2052 | static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits) |
| 2053 | { |
| 2054 | unsigned long *addr; |
| 2055 | int end = bit + nr_bits; |
| 2056 | int n = 0; |
| 2057 | |
| 2058 | while (bit < end) { |
| 2059 | if (((bit & (BITS_PER_LONG - 1)) == 0) && |
| 2060 | ((end - bit) >= BITS_PER_LONG)) { |
| 2061 | /* Try to clear whole word at once */ |
| 2062 | addr = bitmap + BIT_WORD(bit); |
| 2063 | if (*addr == ULONG_MAX) { |
| 2064 | *addr = 0; |
| 2065 | n += BITS_PER_LONG; |
| 2066 | bit += BITS_PER_LONG; |
| 2067 | continue; |
| 2068 | } |
| 2069 | } |
| 2070 | |
| 2071 | if (test_and_clear_bit(bit, bitmap)) |
| 2072 | n++; |
| 2073 | bit++; |
| 2074 | } |
| 2075 | |
| 2076 | return n; |
| 2077 | } |
| 2078 | |
| 2079 | /* |
| 2080 | * Invalidate all the blocks in the range [block..block+nr_blocks-1]. |
| 2081 | */ |
| 2082 | int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2083 | sector_t chunk_block, unsigned int nr_blocks) |
| 2084 | { |
| 2085 | unsigned int count, bit, nr_bits; |
| 2086 | struct dmz_mblock *mblk; |
| 2087 | unsigned int n = 0; |
| 2088 | |
| 2089 | dmz_dev_debug(zmd->dev, "=> INVALIDATE zone %u, block %llu, %u blocks", |
| 2090 | dmz_id(zmd, zone), (u64)chunk_block, nr_blocks); |
| 2091 | |
| 2092 | WARN_ON(chunk_block + nr_blocks > zmd->dev->zone_nr_blocks); |
| 2093 | |
| 2094 | while (nr_blocks) { |
| 2095 | /* Get bitmap block */ |
| 2096 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); |
| 2097 | if (IS_ERR(mblk)) |
| 2098 | return PTR_ERR(mblk); |
| 2099 | |
| 2100 | /* Clear bits */ |
| 2101 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2102 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2103 | |
| 2104 | count = dmz_clear_bits((unsigned long *)mblk->data, |
| 2105 | bit, nr_bits); |
| 2106 | if (count) { |
| 2107 | dmz_dirty_mblock(zmd, mblk); |
| 2108 | n += count; |
| 2109 | } |
| 2110 | dmz_release_mblock(zmd, mblk); |
| 2111 | |
| 2112 | nr_blocks -= nr_bits; |
| 2113 | chunk_block += nr_bits; |
| 2114 | } |
| 2115 | |
| 2116 | if (zone->weight >= n) |
| 2117 | zone->weight -= n; |
| 2118 | else { |
| 2119 | dmz_dev_warn(zmd->dev, "Zone %u: weight %u should be >= %u", |
| 2120 | dmz_id(zmd, zone), zone->weight, n); |
| 2121 | zone->weight = 0; |
| 2122 | } |
| 2123 | |
| 2124 | return 0; |
| 2125 | } |
| 2126 | |
| 2127 | /* |
| 2128 | * Get a block bit value. |
| 2129 | */ |
| 2130 | static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2131 | sector_t chunk_block) |
| 2132 | { |
| 2133 | struct dmz_mblock *mblk; |
| 2134 | int ret; |
| 2135 | |
| 2136 | WARN_ON(chunk_block >= zmd->dev->zone_nr_blocks); |
| 2137 | |
| 2138 | /* Get bitmap block */ |
| 2139 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); |
| 2140 | if (IS_ERR(mblk)) |
| 2141 | return PTR_ERR(mblk); |
| 2142 | |
| 2143 | /* Get offset */ |
| 2144 | ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS, |
| 2145 | (unsigned long *) mblk->data) != 0; |
| 2146 | |
| 2147 | dmz_release_mblock(zmd, mblk); |
| 2148 | |
| 2149 | return ret; |
| 2150 | } |
| 2151 | |
| 2152 | /* |
| 2153 | * Return the number of blocks from chunk_block to the first block with a bit |
| 2154 | * value specified by set. Search at most nr_blocks blocks from chunk_block. |
| 2155 | */ |
| 2156 | static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2157 | sector_t chunk_block, unsigned int nr_blocks, |
| 2158 | int set) |
| 2159 | { |
| 2160 | struct dmz_mblock *mblk; |
| 2161 | unsigned int bit, set_bit, nr_bits; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2162 | unsigned int zone_bits = zmd->zone_bits_per_mblk; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2163 | unsigned long *bitmap; |
| 2164 | int n = 0; |
| 2165 | |
| 2166 | WARN_ON(chunk_block + nr_blocks > zmd->dev->zone_nr_blocks); |
| 2167 | |
| 2168 | while (nr_blocks) { |
| 2169 | /* Get bitmap block */ |
| 2170 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); |
| 2171 | if (IS_ERR(mblk)) |
| 2172 | return PTR_ERR(mblk); |
| 2173 | |
| 2174 | /* Get offset */ |
| 2175 | bitmap = (unsigned long *) mblk->data; |
| 2176 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2177 | nr_bits = min(nr_blocks, zone_bits - bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2178 | if (set) |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2179 | set_bit = find_next_bit(bitmap, zone_bits, bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2180 | else |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2181 | set_bit = find_next_zero_bit(bitmap, zone_bits, bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2182 | dmz_release_mblock(zmd, mblk); |
| 2183 | |
| 2184 | n += set_bit - bit; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2185 | if (set_bit < zone_bits) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2186 | break; |
| 2187 | |
| 2188 | nr_blocks -= nr_bits; |
| 2189 | chunk_block += nr_bits; |
| 2190 | } |
| 2191 | |
| 2192 | return n; |
| 2193 | } |
| 2194 | |
| 2195 | /* |
| 2196 | * Test if chunk_block is valid. If it is, the number of consecutive |
| 2197 | * valid blocks from chunk_block will be returned. |
| 2198 | */ |
| 2199 | int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2200 | sector_t chunk_block) |
| 2201 | { |
| 2202 | int valid; |
| 2203 | |
| 2204 | valid = dmz_test_block(zmd, zone, chunk_block); |
| 2205 | if (valid <= 0) |
| 2206 | return valid; |
| 2207 | |
| 2208 | /* The block is valid: get the number of valid blocks from block */ |
| 2209 | return dmz_to_next_set_block(zmd, zone, chunk_block, |
| 2210 | zmd->dev->zone_nr_blocks - chunk_block, 0); |
| 2211 | } |
| 2212 | |
| 2213 | /* |
| 2214 | * Find the first valid block from @chunk_block in @zone. |
| 2215 | * If such a block is found, its number is returned using |
| 2216 | * @chunk_block and the total number of valid blocks from @chunk_block |
| 2217 | * is returned. |
| 2218 | */ |
| 2219 | int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2220 | sector_t *chunk_block) |
| 2221 | { |
| 2222 | sector_t start_block = *chunk_block; |
| 2223 | int ret; |
| 2224 | |
| 2225 | ret = dmz_to_next_set_block(zmd, zone, start_block, |
| 2226 | zmd->dev->zone_nr_blocks - start_block, 1); |
| 2227 | if (ret < 0) |
| 2228 | return ret; |
| 2229 | |
| 2230 | start_block += ret; |
| 2231 | *chunk_block = start_block; |
| 2232 | |
| 2233 | return dmz_to_next_set_block(zmd, zone, start_block, |
| 2234 | zmd->dev->zone_nr_blocks - start_block, 0); |
| 2235 | } |
| 2236 | |
| 2237 | /* |
| 2238 | * Count the number of bits set starting from bit up to bit + nr_bits - 1. |
| 2239 | */ |
| 2240 | static int dmz_count_bits(void *bitmap, int bit, int nr_bits) |
| 2241 | { |
| 2242 | unsigned long *addr; |
| 2243 | int end = bit + nr_bits; |
| 2244 | int n = 0; |
| 2245 | |
| 2246 | while (bit < end) { |
| 2247 | if (((bit & (BITS_PER_LONG - 1)) == 0) && |
| 2248 | ((end - bit) >= BITS_PER_LONG)) { |
| 2249 | addr = (unsigned long *)bitmap + BIT_WORD(bit); |
| 2250 | if (*addr == ULONG_MAX) { |
| 2251 | n += BITS_PER_LONG; |
| 2252 | bit += BITS_PER_LONG; |
| 2253 | continue; |
| 2254 | } |
| 2255 | } |
| 2256 | |
| 2257 | if (test_bit(bit, bitmap)) |
| 2258 | n++; |
| 2259 | bit++; |
| 2260 | } |
| 2261 | |
| 2262 | return n; |
| 2263 | } |
| 2264 | |
| 2265 | /* |
| 2266 | * Get a zone weight. |
| 2267 | */ |
| 2268 | static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 2269 | { |
| 2270 | struct dmz_mblock *mblk; |
| 2271 | sector_t chunk_block = 0; |
| 2272 | unsigned int bit, nr_bits; |
| 2273 | unsigned int nr_blocks = zmd->dev->zone_nr_blocks; |
| 2274 | void *bitmap; |
| 2275 | int n = 0; |
| 2276 | |
| 2277 | while (nr_blocks) { |
| 2278 | /* Get bitmap block */ |
| 2279 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); |
| 2280 | if (IS_ERR(mblk)) { |
| 2281 | n = 0; |
| 2282 | break; |
| 2283 | } |
| 2284 | |
| 2285 | /* Count bits in this block */ |
| 2286 | bitmap = mblk->data; |
| 2287 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2288 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2289 | n += dmz_count_bits(bitmap, bit, nr_bits); |
| 2290 | |
| 2291 | dmz_release_mblock(zmd, mblk); |
| 2292 | |
| 2293 | nr_blocks -= nr_bits; |
| 2294 | chunk_block += nr_bits; |
| 2295 | } |
| 2296 | |
| 2297 | zone->weight = n; |
| 2298 | } |
| 2299 | |
| 2300 | /* |
| 2301 | * Cleanup the zoned metadata resources. |
| 2302 | */ |
| 2303 | static void dmz_cleanup_metadata(struct dmz_metadata *zmd) |
| 2304 | { |
| 2305 | struct rb_root *root; |
| 2306 | struct dmz_mblock *mblk, *next; |
| 2307 | int i; |
| 2308 | |
| 2309 | /* Release zone mapping resources */ |
| 2310 | if (zmd->map_mblk) { |
| 2311 | for (i = 0; i < zmd->nr_map_blocks; i++) |
| 2312 | dmz_release_mblock(zmd, zmd->map_mblk[i]); |
| 2313 | kfree(zmd->map_mblk); |
| 2314 | zmd->map_mblk = NULL; |
| 2315 | } |
| 2316 | |
| 2317 | /* Release super blocks */ |
| 2318 | for (i = 0; i < 2; i++) { |
| 2319 | if (zmd->sb[i].mblk) { |
| 2320 | dmz_free_mblock(zmd, zmd->sb[i].mblk); |
| 2321 | zmd->sb[i].mblk = NULL; |
| 2322 | } |
| 2323 | } |
| 2324 | |
| 2325 | /* Free cached blocks */ |
| 2326 | while (!list_empty(&zmd->mblk_dirty_list)) { |
| 2327 | mblk = list_first_entry(&zmd->mblk_dirty_list, |
| 2328 | struct dmz_mblock, link); |
| 2329 | dmz_dev_warn(zmd->dev, "mblock %llu still in dirty list (ref %u)", |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 2330 | (u64)mblk->no, mblk->ref); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2331 | list_del_init(&mblk->link); |
| 2332 | rb_erase(&mblk->node, &zmd->mblk_rbtree); |
| 2333 | dmz_free_mblock(zmd, mblk); |
| 2334 | } |
| 2335 | |
| 2336 | while (!list_empty(&zmd->mblk_lru_list)) { |
| 2337 | mblk = list_first_entry(&zmd->mblk_lru_list, |
| 2338 | struct dmz_mblock, link); |
| 2339 | list_del_init(&mblk->link); |
| 2340 | rb_erase(&mblk->node, &zmd->mblk_rbtree); |
| 2341 | dmz_free_mblock(zmd, mblk); |
| 2342 | } |
| 2343 | |
| 2344 | /* Sanity checks: the mblock rbtree should now be empty */ |
| 2345 | root = &zmd->mblk_rbtree; |
| 2346 | rbtree_postorder_for_each_entry_safe(mblk, next, root, node) { |
| 2347 | dmz_dev_warn(zmd->dev, "mblock %llu ref %u still in rbtree", |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 2348 | (u64)mblk->no, mblk->ref); |
| 2349 | mblk->ref = 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2350 | dmz_free_mblock(zmd, mblk); |
| 2351 | } |
| 2352 | |
| 2353 | /* Free the zone descriptors */ |
| 2354 | dmz_drop_zones(zmd); |
Mike Snitzer | d5ffebd | 2018-01-05 21:17:20 -0500 | [diff] [blame] | 2355 | |
| 2356 | mutex_destroy(&zmd->mblk_flush_lock); |
| 2357 | mutex_destroy(&zmd->map_lock); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2358 | } |
| 2359 | |
| 2360 | /* |
| 2361 | * Initialize the zoned metadata. |
| 2362 | */ |
| 2363 | int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **metadata) |
| 2364 | { |
| 2365 | struct dmz_metadata *zmd; |
| 2366 | unsigned int i, zid; |
| 2367 | struct dm_zone *zone; |
| 2368 | int ret; |
| 2369 | |
| 2370 | zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL); |
| 2371 | if (!zmd) |
| 2372 | return -ENOMEM; |
| 2373 | |
| 2374 | zmd->dev = dev; |
| 2375 | zmd->mblk_rbtree = RB_ROOT; |
| 2376 | init_rwsem(&zmd->mblk_sem); |
| 2377 | mutex_init(&zmd->mblk_flush_lock); |
| 2378 | spin_lock_init(&zmd->mblk_lock); |
| 2379 | INIT_LIST_HEAD(&zmd->mblk_lru_list); |
| 2380 | INIT_LIST_HEAD(&zmd->mblk_dirty_list); |
| 2381 | |
| 2382 | mutex_init(&zmd->map_lock); |
| 2383 | atomic_set(&zmd->unmap_nr_rnd, 0); |
| 2384 | INIT_LIST_HEAD(&zmd->unmap_rnd_list); |
| 2385 | INIT_LIST_HEAD(&zmd->map_rnd_list); |
| 2386 | |
| 2387 | atomic_set(&zmd->unmap_nr_seq, 0); |
| 2388 | INIT_LIST_HEAD(&zmd->unmap_seq_list); |
| 2389 | INIT_LIST_HEAD(&zmd->map_seq_list); |
| 2390 | |
| 2391 | atomic_set(&zmd->nr_reserved_seq_zones, 0); |
| 2392 | INIT_LIST_HEAD(&zmd->reserved_seq_zones_list); |
| 2393 | |
| 2394 | init_waitqueue_head(&zmd->free_wq); |
| 2395 | |
| 2396 | /* Initialize zone descriptors */ |
| 2397 | ret = dmz_init_zones(zmd); |
| 2398 | if (ret) |
| 2399 | goto err; |
| 2400 | |
| 2401 | /* Get super block */ |
| 2402 | ret = dmz_load_sb(zmd); |
| 2403 | if (ret) |
| 2404 | goto err; |
| 2405 | |
| 2406 | /* Set metadata zones starting from sb_zone */ |
| 2407 | zid = dmz_id(zmd, zmd->sb_zone); |
| 2408 | for (i = 0; i < zmd->nr_meta_zones << 1; i++) { |
| 2409 | zone = dmz_get(zmd, zid + i); |
| 2410 | if (!dmz_is_rnd(zone)) |
| 2411 | goto err; |
| 2412 | set_bit(DMZ_META, &zone->flags); |
| 2413 | } |
| 2414 | |
| 2415 | /* Load mapping table */ |
| 2416 | ret = dmz_load_mapping(zmd); |
| 2417 | if (ret) |
| 2418 | goto err; |
| 2419 | |
| 2420 | /* |
| 2421 | * Cache size boundaries: allow at least 2 super blocks, the chunk map |
| 2422 | * blocks and enough blocks to be able to cache the bitmap blocks of |
| 2423 | * up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow |
| 2424 | * the cache to add 512 more metadata blocks. |
| 2425 | */ |
| 2426 | zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16; |
| 2427 | zmd->max_nr_mblks = zmd->min_nr_mblks + 512; |
| 2428 | zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count; |
| 2429 | zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan; |
| 2430 | zmd->mblk_shrinker.seeks = DEFAULT_SEEKS; |
| 2431 | |
| 2432 | /* Metadata cache shrinker */ |
| 2433 | ret = register_shrinker(&zmd->mblk_shrinker); |
| 2434 | if (ret) { |
| 2435 | dmz_dev_err(dev, "Register metadata cache shrinker failed"); |
| 2436 | goto err; |
| 2437 | } |
| 2438 | |
| 2439 | dmz_dev_info(dev, "Host-%s zoned block device", |
| 2440 | bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ? |
| 2441 | "aware" : "managed"); |
| 2442 | dmz_dev_info(dev, " %llu 512-byte logical sectors", |
| 2443 | (u64)dev->capacity); |
| 2444 | dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors", |
| 2445 | dev->nr_zones, (u64)dev->zone_nr_sectors); |
| 2446 | dmz_dev_info(dev, " %u metadata zones", |
| 2447 | zmd->nr_meta_zones * 2); |
| 2448 | dmz_dev_info(dev, " %u data zones for %u chunks", |
| 2449 | zmd->nr_data_zones, zmd->nr_chunks); |
| 2450 | dmz_dev_info(dev, " %u random zones (%u unmapped)", |
| 2451 | zmd->nr_rnd, atomic_read(&zmd->unmap_nr_rnd)); |
| 2452 | dmz_dev_info(dev, " %u sequential zones (%u unmapped)", |
| 2453 | zmd->nr_seq, atomic_read(&zmd->unmap_nr_seq)); |
| 2454 | dmz_dev_info(dev, " %u reserved sequential data zones", |
| 2455 | zmd->nr_reserved_seq); |
| 2456 | |
| 2457 | dmz_dev_debug(dev, "Format:"); |
| 2458 | dmz_dev_debug(dev, "%u metadata blocks per set (%u max cache)", |
| 2459 | zmd->nr_meta_blocks, zmd->max_nr_mblks); |
| 2460 | dmz_dev_debug(dev, " %u data zone mapping blocks", |
| 2461 | zmd->nr_map_blocks); |
| 2462 | dmz_dev_debug(dev, " %u bitmap blocks", |
| 2463 | zmd->nr_bitmap_blocks); |
| 2464 | |
| 2465 | *metadata = zmd; |
| 2466 | |
| 2467 | return 0; |
| 2468 | err: |
| 2469 | dmz_cleanup_metadata(zmd); |
| 2470 | kfree(zmd); |
| 2471 | *metadata = NULL; |
| 2472 | |
| 2473 | return ret; |
| 2474 | } |
| 2475 | |
| 2476 | /* |
| 2477 | * Cleanup the zoned metadata resources. |
| 2478 | */ |
| 2479 | void dmz_dtr_metadata(struct dmz_metadata *zmd) |
| 2480 | { |
| 2481 | unregister_shrinker(&zmd->mblk_shrinker); |
| 2482 | dmz_cleanup_metadata(zmd); |
| 2483 | kfree(zmd); |
| 2484 | } |
| 2485 | |
| 2486 | /* |
| 2487 | * Check zone information on resume. |
| 2488 | */ |
| 2489 | int dmz_resume_metadata(struct dmz_metadata *zmd) |
| 2490 | { |
| 2491 | struct dmz_dev *dev = zmd->dev; |
| 2492 | struct dm_zone *zone; |
| 2493 | sector_t wp_block; |
| 2494 | unsigned int i; |
| 2495 | int ret; |
| 2496 | |
| 2497 | /* Check zones */ |
| 2498 | for (i = 0; i < dev->nr_zones; i++) { |
| 2499 | zone = dmz_get(zmd, i); |
| 2500 | if (!zone) { |
| 2501 | dmz_dev_err(dev, "Unable to get zone %u", i); |
| 2502 | return -EIO; |
| 2503 | } |
| 2504 | |
| 2505 | wp_block = zone->wp_block; |
| 2506 | |
| 2507 | ret = dmz_update_zone(zmd, zone); |
| 2508 | if (ret) { |
| 2509 | dmz_dev_err(dev, "Broken zone %u", i); |
| 2510 | return ret; |
| 2511 | } |
| 2512 | |
| 2513 | if (dmz_is_offline(zone)) { |
| 2514 | dmz_dev_warn(dev, "Zone %u is offline", i); |
| 2515 | continue; |
| 2516 | } |
| 2517 | |
| 2518 | /* Check write pointer */ |
| 2519 | if (!dmz_is_seq(zone)) |
| 2520 | zone->wp_block = 0; |
| 2521 | else if (zone->wp_block != wp_block) { |
| 2522 | dmz_dev_err(dev, "Zone %u: Invalid wp (%llu / %llu)", |
| 2523 | i, (u64)zone->wp_block, (u64)wp_block); |
| 2524 | zone->wp_block = wp_block; |
| 2525 | dmz_invalidate_blocks(zmd, zone, zone->wp_block, |
| 2526 | dev->zone_nr_blocks - zone->wp_block); |
| 2527 | } |
| 2528 | } |
| 2529 | |
| 2530 | return 0; |
| 2531 | } |