1eec40579SJoe Thornber #include "dm.h" 2eec40579SJoe Thornber #include "persistent-data/dm-transaction-manager.h" 3eec40579SJoe Thornber #include "persistent-data/dm-bitset.h" 4eec40579SJoe Thornber #include "persistent-data/dm-space-map.h" 5eec40579SJoe Thornber 6eec40579SJoe Thornber #include <linux/dm-io.h> 7eec40579SJoe Thornber #include <linux/dm-kcopyd.h> 8eec40579SJoe Thornber #include <linux/init.h> 9eec40579SJoe Thornber #include <linux/mempool.h> 10eec40579SJoe Thornber #include <linux/module.h> 11eec40579SJoe Thornber #include <linux/slab.h> 12eec40579SJoe Thornber #include <linux/vmalloc.h> 13eec40579SJoe Thornber 14eec40579SJoe Thornber #define DM_MSG_PREFIX "era" 15eec40579SJoe Thornber 16eec40579SJoe Thornber #define SUPERBLOCK_LOCATION 0 17eec40579SJoe Thornber #define SUPERBLOCK_MAGIC 2126579579 18eec40579SJoe Thornber #define SUPERBLOCK_CSUM_XOR 146538381 19eec40579SJoe Thornber #define MIN_ERA_VERSION 1 20eec40579SJoe Thornber #define MAX_ERA_VERSION 1 21eec40579SJoe Thornber #define INVALID_WRITESET_ROOT SUPERBLOCK_LOCATION 22eec40579SJoe Thornber #define MIN_BLOCK_SIZE 8 23eec40579SJoe Thornber 24eec40579SJoe Thornber /*---------------------------------------------------------------- 25eec40579SJoe Thornber * Writeset 26eec40579SJoe Thornber *--------------------------------------------------------------*/ 27eec40579SJoe Thornber struct writeset_metadata { 28eec40579SJoe Thornber uint32_t nr_bits; 29eec40579SJoe Thornber dm_block_t root; 30eec40579SJoe Thornber }; 31eec40579SJoe Thornber 32eec40579SJoe Thornber struct writeset { 33eec40579SJoe Thornber struct writeset_metadata md; 34eec40579SJoe Thornber 35eec40579SJoe Thornber /* 36eec40579SJoe Thornber * An in core copy of the bits to save constantly doing look ups on 37eec40579SJoe Thornber * disk. 38eec40579SJoe Thornber */ 39eec40579SJoe Thornber unsigned long *bits; 40eec40579SJoe Thornber }; 41eec40579SJoe Thornber 42eec40579SJoe Thornber /* 43eec40579SJoe Thornber * This does not free off the on disk bitset as this will normally be done 44eec40579SJoe Thornber * after digesting into the era array. 45eec40579SJoe Thornber */ 46eec40579SJoe Thornber static void writeset_free(struct writeset *ws) 47eec40579SJoe Thornber { 48eec40579SJoe Thornber vfree(ws->bits); 49eec40579SJoe Thornber } 50eec40579SJoe Thornber 51eec40579SJoe Thornber static int setup_on_disk_bitset(struct dm_disk_bitset *info, 52eec40579SJoe Thornber unsigned nr_bits, dm_block_t *root) 53eec40579SJoe Thornber { 54eec40579SJoe Thornber int r; 55eec40579SJoe Thornber 56eec40579SJoe Thornber r = dm_bitset_empty(info, root); 57eec40579SJoe Thornber if (r) 58eec40579SJoe Thornber return r; 59eec40579SJoe Thornber 60eec40579SJoe Thornber return dm_bitset_resize(info, *root, 0, nr_bits, false, root); 61eec40579SJoe Thornber } 62eec40579SJoe Thornber 63eec40579SJoe Thornber static size_t bitset_size(unsigned nr_bits) 64eec40579SJoe Thornber { 65eec40579SJoe Thornber return sizeof(unsigned long) * dm_div_up(nr_bits, BITS_PER_LONG); 66eec40579SJoe Thornber } 67eec40579SJoe Thornber 68eec40579SJoe Thornber /* 69eec40579SJoe Thornber * Allocates memory for the in core bitset. 70eec40579SJoe Thornber */ 71eec40579SJoe Thornber static int writeset_alloc(struct writeset *ws, dm_block_t nr_blocks) 72eec40579SJoe Thornber { 73eec40579SJoe Thornber ws->md.nr_bits = nr_blocks; 74eec40579SJoe Thornber ws->md.root = INVALID_WRITESET_ROOT; 75eec40579SJoe Thornber ws->bits = vzalloc(bitset_size(nr_blocks)); 76eec40579SJoe Thornber if (!ws->bits) { 77eec40579SJoe Thornber DMERR("%s: couldn't allocate in memory bitset", __func__); 78eec40579SJoe Thornber return -ENOMEM; 79eec40579SJoe Thornber } 80eec40579SJoe Thornber 81eec40579SJoe Thornber return 0; 82eec40579SJoe Thornber } 83eec40579SJoe Thornber 84eec40579SJoe Thornber /* 85eec40579SJoe Thornber * Wipes the in-core bitset, and creates a new on disk bitset. 86eec40579SJoe Thornber */ 87eec40579SJoe Thornber static int writeset_init(struct dm_disk_bitset *info, struct writeset *ws) 88eec40579SJoe Thornber { 89eec40579SJoe Thornber int r; 90eec40579SJoe Thornber 91eec40579SJoe Thornber memset(ws->bits, 0, bitset_size(ws->md.nr_bits)); 92eec40579SJoe Thornber 93eec40579SJoe Thornber r = setup_on_disk_bitset(info, ws->md.nr_bits, &ws->md.root); 94eec40579SJoe Thornber if (r) { 95eec40579SJoe Thornber DMERR("%s: setup_on_disk_bitset failed", __func__); 96eec40579SJoe Thornber return r; 97eec40579SJoe Thornber } 98eec40579SJoe Thornber 99eec40579SJoe Thornber return 0; 100eec40579SJoe Thornber } 101eec40579SJoe Thornber 102eec40579SJoe Thornber static bool writeset_marked(struct writeset *ws, dm_block_t block) 103eec40579SJoe Thornber { 104eec40579SJoe Thornber return test_bit(block, ws->bits); 105eec40579SJoe Thornber } 106eec40579SJoe Thornber 107eec40579SJoe Thornber static int writeset_marked_on_disk(struct dm_disk_bitset *info, 108eec40579SJoe Thornber struct writeset_metadata *m, dm_block_t block, 109eec40579SJoe Thornber bool *result) 110eec40579SJoe Thornber { 111eec40579SJoe Thornber dm_block_t old = m->root; 112eec40579SJoe Thornber 113eec40579SJoe Thornber /* 114eec40579SJoe Thornber * The bitset was flushed when it was archived, so we know there'll 115eec40579SJoe Thornber * be no change to the root. 116eec40579SJoe Thornber */ 117eec40579SJoe Thornber int r = dm_bitset_test_bit(info, m->root, block, &m->root, result); 118eec40579SJoe Thornber if (r) { 119eec40579SJoe Thornber DMERR("%s: dm_bitset_test_bit failed", __func__); 120eec40579SJoe Thornber return r; 121eec40579SJoe Thornber } 122eec40579SJoe Thornber 123eec40579SJoe Thornber BUG_ON(m->root != old); 124eec40579SJoe Thornber 125eec40579SJoe Thornber return r; 126eec40579SJoe Thornber } 127eec40579SJoe Thornber 128eec40579SJoe Thornber /* 129eec40579SJoe Thornber * Returns < 0 on error, 0 if the bit wasn't previously set, 1 if it was. 130eec40579SJoe Thornber */ 131eec40579SJoe Thornber static int writeset_test_and_set(struct dm_disk_bitset *info, 132eec40579SJoe Thornber struct writeset *ws, uint32_t block) 133eec40579SJoe Thornber { 134eec40579SJoe Thornber int r; 135eec40579SJoe Thornber 136eec40579SJoe Thornber if (!test_and_set_bit(block, ws->bits)) { 137eec40579SJoe Thornber r = dm_bitset_set_bit(info, ws->md.root, block, &ws->md.root); 138eec40579SJoe Thornber if (r) { 139eec40579SJoe Thornber /* FIXME: fail mode */ 140eec40579SJoe Thornber return r; 141eec40579SJoe Thornber } 142eec40579SJoe Thornber 143eec40579SJoe Thornber return 0; 144eec40579SJoe Thornber } 145eec40579SJoe Thornber 146eec40579SJoe Thornber return 1; 147eec40579SJoe Thornber } 148eec40579SJoe Thornber 149eec40579SJoe Thornber /*---------------------------------------------------------------- 150eec40579SJoe Thornber * On disk metadata layout 151eec40579SJoe Thornber *--------------------------------------------------------------*/ 152eec40579SJoe Thornber #define SPACE_MAP_ROOT_SIZE 128 153eec40579SJoe Thornber #define UUID_LEN 16 154eec40579SJoe Thornber 155eec40579SJoe Thornber struct writeset_disk { 156eec40579SJoe Thornber __le32 nr_bits; 157eec40579SJoe Thornber __le64 root; 158eec40579SJoe Thornber } __packed; 159eec40579SJoe Thornber 160eec40579SJoe Thornber struct superblock_disk { 161eec40579SJoe Thornber __le32 csum; 162eec40579SJoe Thornber __le32 flags; 163eec40579SJoe Thornber __le64 blocknr; 164eec40579SJoe Thornber 165eec40579SJoe Thornber __u8 uuid[UUID_LEN]; 166eec40579SJoe Thornber __le64 magic; 167eec40579SJoe Thornber __le32 version; 168eec40579SJoe Thornber 169eec40579SJoe Thornber __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; 170eec40579SJoe Thornber 171eec40579SJoe Thornber __le32 data_block_size; 172eec40579SJoe Thornber __le32 metadata_block_size; 173eec40579SJoe Thornber __le32 nr_blocks; 174eec40579SJoe Thornber 175eec40579SJoe Thornber __le32 current_era; 176eec40579SJoe Thornber struct writeset_disk current_writeset; 177eec40579SJoe Thornber 178eec40579SJoe Thornber /* 179eec40579SJoe Thornber * Only these two fields are valid within the metadata snapshot. 180eec40579SJoe Thornber */ 181eec40579SJoe Thornber __le64 writeset_tree_root; 182eec40579SJoe Thornber __le64 era_array_root; 183eec40579SJoe Thornber 184eec40579SJoe Thornber __le64 metadata_snap; 185eec40579SJoe Thornber } __packed; 186eec40579SJoe Thornber 187eec40579SJoe Thornber /*---------------------------------------------------------------- 188eec40579SJoe Thornber * Superblock validation 189eec40579SJoe Thornber *--------------------------------------------------------------*/ 190eec40579SJoe Thornber static void sb_prepare_for_write(struct dm_block_validator *v, 191eec40579SJoe Thornber struct dm_block *b, 192eec40579SJoe Thornber size_t sb_block_size) 193eec40579SJoe Thornber { 194eec40579SJoe Thornber struct superblock_disk *disk = dm_block_data(b); 195eec40579SJoe Thornber 196eec40579SJoe Thornber disk->blocknr = cpu_to_le64(dm_block_location(b)); 197eec40579SJoe Thornber disk->csum = cpu_to_le32(dm_bm_checksum(&disk->flags, 198eec40579SJoe Thornber sb_block_size - sizeof(__le32), 199eec40579SJoe Thornber SUPERBLOCK_CSUM_XOR)); 200eec40579SJoe Thornber } 201eec40579SJoe Thornber 202eec40579SJoe Thornber static int check_metadata_version(struct superblock_disk *disk) 203eec40579SJoe Thornber { 204eec40579SJoe Thornber uint32_t metadata_version = le32_to_cpu(disk->version); 205eec40579SJoe Thornber if (metadata_version < MIN_ERA_VERSION || metadata_version > MAX_ERA_VERSION) { 206eec40579SJoe Thornber DMERR("Era metadata version %u found, but only versions between %u and %u supported.", 207eec40579SJoe Thornber metadata_version, MIN_ERA_VERSION, MAX_ERA_VERSION); 208eec40579SJoe Thornber return -EINVAL; 209eec40579SJoe Thornber } 210eec40579SJoe Thornber 211eec40579SJoe Thornber return 0; 212eec40579SJoe Thornber } 213eec40579SJoe Thornber 214eec40579SJoe Thornber static int sb_check(struct dm_block_validator *v, 215eec40579SJoe Thornber struct dm_block *b, 216eec40579SJoe Thornber size_t sb_block_size) 217eec40579SJoe Thornber { 218eec40579SJoe Thornber struct superblock_disk *disk = dm_block_data(b); 219eec40579SJoe Thornber __le32 csum_le; 220eec40579SJoe Thornber 221eec40579SJoe Thornber if (dm_block_location(b) != le64_to_cpu(disk->blocknr)) { 222eec40579SJoe Thornber DMERR("sb_check failed: blocknr %llu: wanted %llu", 223eec40579SJoe Thornber le64_to_cpu(disk->blocknr), 224eec40579SJoe Thornber (unsigned long long)dm_block_location(b)); 225eec40579SJoe Thornber return -ENOTBLK; 226eec40579SJoe Thornber } 227eec40579SJoe Thornber 228eec40579SJoe Thornber if (le64_to_cpu(disk->magic) != SUPERBLOCK_MAGIC) { 229eec40579SJoe Thornber DMERR("sb_check failed: magic %llu: wanted %llu", 230eec40579SJoe Thornber le64_to_cpu(disk->magic), 231eec40579SJoe Thornber (unsigned long long) SUPERBLOCK_MAGIC); 232eec40579SJoe Thornber return -EILSEQ; 233eec40579SJoe Thornber } 234eec40579SJoe Thornber 235eec40579SJoe Thornber csum_le = cpu_to_le32(dm_bm_checksum(&disk->flags, 236eec40579SJoe Thornber sb_block_size - sizeof(__le32), 237eec40579SJoe Thornber SUPERBLOCK_CSUM_XOR)); 238eec40579SJoe Thornber if (csum_le != disk->csum) { 239eec40579SJoe Thornber DMERR("sb_check failed: csum %u: wanted %u", 240eec40579SJoe Thornber le32_to_cpu(csum_le), le32_to_cpu(disk->csum)); 241eec40579SJoe Thornber return -EILSEQ; 242eec40579SJoe Thornber } 243eec40579SJoe Thornber 244eec40579SJoe Thornber return check_metadata_version(disk); 245eec40579SJoe Thornber } 246eec40579SJoe Thornber 247eec40579SJoe Thornber static struct dm_block_validator sb_validator = { 248eec40579SJoe Thornber .name = "superblock", 249eec40579SJoe Thornber .prepare_for_write = sb_prepare_for_write, 250eec40579SJoe Thornber .check = sb_check 251eec40579SJoe Thornber }; 252eec40579SJoe Thornber 253eec40579SJoe Thornber /*---------------------------------------------------------------- 254eec40579SJoe Thornber * Low level metadata handling 255eec40579SJoe Thornber *--------------------------------------------------------------*/ 256eec40579SJoe Thornber #define DM_ERA_METADATA_BLOCK_SIZE 4096 257eec40579SJoe Thornber #define ERA_MAX_CONCURRENT_LOCKS 5 258eec40579SJoe Thornber 259eec40579SJoe Thornber struct era_metadata { 260eec40579SJoe Thornber struct block_device *bdev; 261eec40579SJoe Thornber struct dm_block_manager *bm; 262eec40579SJoe Thornber struct dm_space_map *sm; 263eec40579SJoe Thornber struct dm_transaction_manager *tm; 264eec40579SJoe Thornber 265eec40579SJoe Thornber dm_block_t block_size; 266eec40579SJoe Thornber uint32_t nr_blocks; 267eec40579SJoe Thornber 268eec40579SJoe Thornber uint32_t current_era; 269eec40579SJoe Thornber 270eec40579SJoe Thornber /* 271eec40579SJoe Thornber * We preallocate 2 writesets. When an era rolls over we 272eec40579SJoe Thornber * switch between them. This means the allocation is done at 273eec40579SJoe Thornber * preresume time, rather than on the io path. 274eec40579SJoe Thornber */ 275eec40579SJoe Thornber struct writeset writesets[2]; 276eec40579SJoe Thornber struct writeset *current_writeset; 277eec40579SJoe Thornber 278eec40579SJoe Thornber dm_block_t writeset_tree_root; 279eec40579SJoe Thornber dm_block_t era_array_root; 280eec40579SJoe Thornber 281eec40579SJoe Thornber struct dm_disk_bitset bitset_info; 282eec40579SJoe Thornber struct dm_btree_info writeset_tree_info; 283eec40579SJoe Thornber struct dm_array_info era_array_info; 284eec40579SJoe Thornber 285eec40579SJoe Thornber dm_block_t metadata_snap; 286eec40579SJoe Thornber 287eec40579SJoe Thornber /* 288eec40579SJoe Thornber * A flag that is set whenever a writeset has been archived. 289eec40579SJoe Thornber */ 290eec40579SJoe Thornber bool archived_writesets; 2915a32083dSJoe Thornber 2925a32083dSJoe Thornber /* 2935a32083dSJoe Thornber * Reading the space map root can fail, so we read it into this 2945a32083dSJoe Thornber * buffer before the superblock is locked and updated. 2955a32083dSJoe Thornber */ 2965a32083dSJoe Thornber __u8 metadata_space_map_root[SPACE_MAP_ROOT_SIZE]; 297eec40579SJoe Thornber }; 298eec40579SJoe Thornber 299eec40579SJoe Thornber static int superblock_read_lock(struct era_metadata *md, 300eec40579SJoe Thornber struct dm_block **sblock) 301eec40579SJoe Thornber { 302eec40579SJoe Thornber return dm_bm_read_lock(md->bm, SUPERBLOCK_LOCATION, 303eec40579SJoe Thornber &sb_validator, sblock); 304eec40579SJoe Thornber } 305eec40579SJoe Thornber 306eec40579SJoe Thornber static int superblock_lock_zero(struct era_metadata *md, 307eec40579SJoe Thornber struct dm_block **sblock) 308eec40579SJoe Thornber { 309eec40579SJoe Thornber return dm_bm_write_lock_zero(md->bm, SUPERBLOCK_LOCATION, 310eec40579SJoe Thornber &sb_validator, sblock); 311eec40579SJoe Thornber } 312eec40579SJoe Thornber 313eec40579SJoe Thornber static int superblock_lock(struct era_metadata *md, 314eec40579SJoe Thornber struct dm_block **sblock) 315eec40579SJoe Thornber { 316eec40579SJoe Thornber return dm_bm_write_lock(md->bm, SUPERBLOCK_LOCATION, 317eec40579SJoe Thornber &sb_validator, sblock); 318eec40579SJoe Thornber } 319eec40579SJoe Thornber 320eec40579SJoe Thornber /* FIXME: duplication with cache and thin */ 321eec40579SJoe Thornber static int superblock_all_zeroes(struct dm_block_manager *bm, bool *result) 322eec40579SJoe Thornber { 323eec40579SJoe Thornber int r; 324eec40579SJoe Thornber unsigned i; 325eec40579SJoe Thornber struct dm_block *b; 326eec40579SJoe Thornber __le64 *data_le, zero = cpu_to_le64(0); 327eec40579SJoe Thornber unsigned sb_block_size = dm_bm_block_size(bm) / sizeof(__le64); 328eec40579SJoe Thornber 329eec40579SJoe Thornber /* 330eec40579SJoe Thornber * We can't use a validator here - it may be all zeroes. 331eec40579SJoe Thornber */ 332eec40579SJoe Thornber r = dm_bm_read_lock(bm, SUPERBLOCK_LOCATION, NULL, &b); 333eec40579SJoe Thornber if (r) 334eec40579SJoe Thornber return r; 335eec40579SJoe Thornber 336eec40579SJoe Thornber data_le = dm_block_data(b); 337eec40579SJoe Thornber *result = true; 338eec40579SJoe Thornber for (i = 0; i < sb_block_size; i++) { 339eec40579SJoe Thornber if (data_le[i] != zero) { 340eec40579SJoe Thornber *result = false; 341eec40579SJoe Thornber break; 342eec40579SJoe Thornber } 343eec40579SJoe Thornber } 344eec40579SJoe Thornber 3454c7da06fSMikulas Patocka dm_bm_unlock(b); 3464c7da06fSMikulas Patocka 3474c7da06fSMikulas Patocka return 0; 348eec40579SJoe Thornber } 349eec40579SJoe Thornber 350eec40579SJoe Thornber /*----------------------------------------------------------------*/ 351eec40579SJoe Thornber 352eec40579SJoe Thornber static void ws_pack(const struct writeset_metadata *core, struct writeset_disk *disk) 353eec40579SJoe Thornber { 354eec40579SJoe Thornber disk->nr_bits = cpu_to_le32(core->nr_bits); 355eec40579SJoe Thornber disk->root = cpu_to_le64(core->root); 356eec40579SJoe Thornber } 357eec40579SJoe Thornber 358eec40579SJoe Thornber static void ws_unpack(const struct writeset_disk *disk, struct writeset_metadata *core) 359eec40579SJoe Thornber { 360eec40579SJoe Thornber core->nr_bits = le32_to_cpu(disk->nr_bits); 361eec40579SJoe Thornber core->root = le64_to_cpu(disk->root); 362eec40579SJoe Thornber } 363eec40579SJoe Thornber 364eec40579SJoe Thornber static void ws_inc(void *context, const void *value) 365eec40579SJoe Thornber { 366eec40579SJoe Thornber struct era_metadata *md = context; 367eec40579SJoe Thornber struct writeset_disk ws_d; 368eec40579SJoe Thornber dm_block_t b; 369eec40579SJoe Thornber 370eec40579SJoe Thornber memcpy(&ws_d, value, sizeof(ws_d)); 371eec40579SJoe Thornber b = le64_to_cpu(ws_d.root); 372eec40579SJoe Thornber 373eec40579SJoe Thornber dm_tm_inc(md->tm, b); 374eec40579SJoe Thornber } 375eec40579SJoe Thornber 376eec40579SJoe Thornber static void ws_dec(void *context, const void *value) 377eec40579SJoe Thornber { 378eec40579SJoe Thornber struct era_metadata *md = context; 379eec40579SJoe Thornber struct writeset_disk ws_d; 380eec40579SJoe Thornber dm_block_t b; 381eec40579SJoe Thornber 382eec40579SJoe Thornber memcpy(&ws_d, value, sizeof(ws_d)); 383eec40579SJoe Thornber b = le64_to_cpu(ws_d.root); 384eec40579SJoe Thornber 385eec40579SJoe Thornber dm_bitset_del(&md->bitset_info, b); 386eec40579SJoe Thornber } 387eec40579SJoe Thornber 388eec40579SJoe Thornber static int ws_eq(void *context, const void *value1, const void *value2) 389eec40579SJoe Thornber { 390eec40579SJoe Thornber return !memcmp(value1, value2, sizeof(struct writeset_metadata)); 391eec40579SJoe Thornber } 392eec40579SJoe Thornber 393eec40579SJoe Thornber /*----------------------------------------------------------------*/ 394eec40579SJoe Thornber 395eec40579SJoe Thornber static void setup_writeset_tree_info(struct era_metadata *md) 396eec40579SJoe Thornber { 397eec40579SJoe Thornber struct dm_btree_value_type *vt = &md->writeset_tree_info.value_type; 398eec40579SJoe Thornber md->writeset_tree_info.tm = md->tm; 399eec40579SJoe Thornber md->writeset_tree_info.levels = 1; 400eec40579SJoe Thornber vt->context = md; 401eec40579SJoe Thornber vt->size = sizeof(struct writeset_disk); 402eec40579SJoe Thornber vt->inc = ws_inc; 403eec40579SJoe Thornber vt->dec = ws_dec; 404eec40579SJoe Thornber vt->equal = ws_eq; 405eec40579SJoe Thornber } 406eec40579SJoe Thornber 407eec40579SJoe Thornber static void setup_era_array_info(struct era_metadata *md) 408eec40579SJoe Thornber 409eec40579SJoe Thornber { 410eec40579SJoe Thornber struct dm_btree_value_type vt; 411eec40579SJoe Thornber vt.context = NULL; 412eec40579SJoe Thornber vt.size = sizeof(__le32); 413eec40579SJoe Thornber vt.inc = NULL; 414eec40579SJoe Thornber vt.dec = NULL; 415eec40579SJoe Thornber vt.equal = NULL; 416eec40579SJoe Thornber 417eec40579SJoe Thornber dm_array_info_init(&md->era_array_info, md->tm, &vt); 418eec40579SJoe Thornber } 419eec40579SJoe Thornber 420eec40579SJoe Thornber static void setup_infos(struct era_metadata *md) 421eec40579SJoe Thornber { 422eec40579SJoe Thornber dm_disk_bitset_init(md->tm, &md->bitset_info); 423eec40579SJoe Thornber setup_writeset_tree_info(md); 424eec40579SJoe Thornber setup_era_array_info(md); 425eec40579SJoe Thornber } 426eec40579SJoe Thornber 427eec40579SJoe Thornber /*----------------------------------------------------------------*/ 428eec40579SJoe Thornber 429eec40579SJoe Thornber static int create_fresh_metadata(struct era_metadata *md) 430eec40579SJoe Thornber { 431eec40579SJoe Thornber int r; 432eec40579SJoe Thornber 433eec40579SJoe Thornber r = dm_tm_create_with_sm(md->bm, SUPERBLOCK_LOCATION, 434eec40579SJoe Thornber &md->tm, &md->sm); 435eec40579SJoe Thornber if (r < 0) { 436eec40579SJoe Thornber DMERR("dm_tm_create_with_sm failed"); 437eec40579SJoe Thornber return r; 438eec40579SJoe Thornber } 439eec40579SJoe Thornber 440eec40579SJoe Thornber setup_infos(md); 441eec40579SJoe Thornber 442eec40579SJoe Thornber r = dm_btree_empty(&md->writeset_tree_info, &md->writeset_tree_root); 443eec40579SJoe Thornber if (r) { 444eec40579SJoe Thornber DMERR("couldn't create new writeset tree"); 445eec40579SJoe Thornber goto bad; 446eec40579SJoe Thornber } 447eec40579SJoe Thornber 448eec40579SJoe Thornber r = dm_array_empty(&md->era_array_info, &md->era_array_root); 449eec40579SJoe Thornber if (r) { 450eec40579SJoe Thornber DMERR("couldn't create era array"); 451eec40579SJoe Thornber goto bad; 452eec40579SJoe Thornber } 453eec40579SJoe Thornber 454eec40579SJoe Thornber return 0; 455eec40579SJoe Thornber 456eec40579SJoe Thornber bad: 457eec40579SJoe Thornber dm_sm_destroy(md->sm); 458eec40579SJoe Thornber dm_tm_destroy(md->tm); 459eec40579SJoe Thornber 460eec40579SJoe Thornber return r; 461eec40579SJoe Thornber } 462eec40579SJoe Thornber 4635a32083dSJoe Thornber static int save_sm_root(struct era_metadata *md) 4645a32083dSJoe Thornber { 4655a32083dSJoe Thornber int r; 4665a32083dSJoe Thornber size_t metadata_len; 4675a32083dSJoe Thornber 4685a32083dSJoe Thornber r = dm_sm_root_size(md->sm, &metadata_len); 4695a32083dSJoe Thornber if (r < 0) 4705a32083dSJoe Thornber return r; 4715a32083dSJoe Thornber 4725a32083dSJoe Thornber return dm_sm_copy_root(md->sm, &md->metadata_space_map_root, 4735a32083dSJoe Thornber metadata_len); 4745a32083dSJoe Thornber } 4755a32083dSJoe Thornber 4765a32083dSJoe Thornber static void copy_sm_root(struct era_metadata *md, struct superblock_disk *disk) 4775a32083dSJoe Thornber { 4785a32083dSJoe Thornber memcpy(&disk->metadata_space_map_root, 4795a32083dSJoe Thornber &md->metadata_space_map_root, 4805a32083dSJoe Thornber sizeof(md->metadata_space_map_root)); 4815a32083dSJoe Thornber } 4825a32083dSJoe Thornber 483eec40579SJoe Thornber /* 484eec40579SJoe Thornber * Writes a superblock, including the static fields that don't get updated 485eec40579SJoe Thornber * with every commit (possible optimisation here). 'md' should be fully 486eec40579SJoe Thornber * constructed when this is called. 487eec40579SJoe Thornber */ 4885a32083dSJoe Thornber static void prepare_superblock(struct era_metadata *md, struct superblock_disk *disk) 489eec40579SJoe Thornber { 490eec40579SJoe Thornber disk->magic = cpu_to_le64(SUPERBLOCK_MAGIC); 491eec40579SJoe Thornber disk->flags = cpu_to_le32(0ul); 492eec40579SJoe Thornber 493eec40579SJoe Thornber /* FIXME: can't keep blanking the uuid (uuid is currently unused though) */ 494eec40579SJoe Thornber memset(disk->uuid, 0, sizeof(disk->uuid)); 495eec40579SJoe Thornber disk->version = cpu_to_le32(MAX_ERA_VERSION); 496eec40579SJoe Thornber 4975a32083dSJoe Thornber copy_sm_root(md, disk); 498eec40579SJoe Thornber 499eec40579SJoe Thornber disk->data_block_size = cpu_to_le32(md->block_size); 500eec40579SJoe Thornber disk->metadata_block_size = cpu_to_le32(DM_ERA_METADATA_BLOCK_SIZE >> SECTOR_SHIFT); 501eec40579SJoe Thornber disk->nr_blocks = cpu_to_le32(md->nr_blocks); 502eec40579SJoe Thornber disk->current_era = cpu_to_le32(md->current_era); 503eec40579SJoe Thornber 504eec40579SJoe Thornber ws_pack(&md->current_writeset->md, &disk->current_writeset); 505eec40579SJoe Thornber disk->writeset_tree_root = cpu_to_le64(md->writeset_tree_root); 506eec40579SJoe Thornber disk->era_array_root = cpu_to_le64(md->era_array_root); 507eec40579SJoe Thornber disk->metadata_snap = cpu_to_le64(md->metadata_snap); 508eec40579SJoe Thornber } 509eec40579SJoe Thornber 510eec40579SJoe Thornber static int write_superblock(struct era_metadata *md) 511eec40579SJoe Thornber { 512eec40579SJoe Thornber int r; 513eec40579SJoe Thornber struct dm_block *sblock; 514eec40579SJoe Thornber struct superblock_disk *disk; 515eec40579SJoe Thornber 5165a32083dSJoe Thornber r = save_sm_root(md); 5175a32083dSJoe Thornber if (r) { 5185a32083dSJoe Thornber DMERR("%s: save_sm_root failed", __func__); 5195a32083dSJoe Thornber return r; 5205a32083dSJoe Thornber } 5215a32083dSJoe Thornber 522eec40579SJoe Thornber r = superblock_lock_zero(md, &sblock); 523eec40579SJoe Thornber if (r) 524eec40579SJoe Thornber return r; 525eec40579SJoe Thornber 526eec40579SJoe Thornber disk = dm_block_data(sblock); 5275a32083dSJoe Thornber prepare_superblock(md, disk); 528eec40579SJoe Thornber 529eec40579SJoe Thornber return dm_tm_commit(md->tm, sblock); 530eec40579SJoe Thornber } 531eec40579SJoe Thornber 532eec40579SJoe Thornber /* 533eec40579SJoe Thornber * Assumes block_size and the infos are set. 534eec40579SJoe Thornber */ 535eec40579SJoe Thornber static int format_metadata(struct era_metadata *md) 536eec40579SJoe Thornber { 537eec40579SJoe Thornber int r; 538eec40579SJoe Thornber 539eec40579SJoe Thornber r = create_fresh_metadata(md); 540eec40579SJoe Thornber if (r) 541eec40579SJoe Thornber return r; 542eec40579SJoe Thornber 543eec40579SJoe Thornber r = write_superblock(md); 544eec40579SJoe Thornber if (r) { 545eec40579SJoe Thornber dm_sm_destroy(md->sm); 546eec40579SJoe Thornber dm_tm_destroy(md->tm); 547eec40579SJoe Thornber return r; 548eec40579SJoe Thornber } 549eec40579SJoe Thornber 550eec40579SJoe Thornber return 0; 551eec40579SJoe Thornber } 552eec40579SJoe Thornber 553eec40579SJoe Thornber static int open_metadata(struct era_metadata *md) 554eec40579SJoe Thornber { 555eec40579SJoe Thornber int r; 556eec40579SJoe Thornber struct dm_block *sblock; 557eec40579SJoe Thornber struct superblock_disk *disk; 558eec40579SJoe Thornber 559eec40579SJoe Thornber r = superblock_read_lock(md, &sblock); 560eec40579SJoe Thornber if (r) { 561eec40579SJoe Thornber DMERR("couldn't read_lock superblock"); 562eec40579SJoe Thornber return r; 563eec40579SJoe Thornber } 564eec40579SJoe Thornber 565eec40579SJoe Thornber disk = dm_block_data(sblock); 566eec40579SJoe Thornber r = dm_tm_open_with_sm(md->bm, SUPERBLOCK_LOCATION, 567eec40579SJoe Thornber disk->metadata_space_map_root, 568eec40579SJoe Thornber sizeof(disk->metadata_space_map_root), 569eec40579SJoe Thornber &md->tm, &md->sm); 570eec40579SJoe Thornber if (r) { 571eec40579SJoe Thornber DMERR("dm_tm_open_with_sm failed"); 572eec40579SJoe Thornber goto bad; 573eec40579SJoe Thornber } 574eec40579SJoe Thornber 575eec40579SJoe Thornber setup_infos(md); 576eec40579SJoe Thornber 577eec40579SJoe Thornber md->block_size = le32_to_cpu(disk->data_block_size); 578eec40579SJoe Thornber md->nr_blocks = le32_to_cpu(disk->nr_blocks); 579eec40579SJoe Thornber md->current_era = le32_to_cpu(disk->current_era); 580eec40579SJoe Thornber 581eec40579SJoe Thornber md->writeset_tree_root = le64_to_cpu(disk->writeset_tree_root); 582eec40579SJoe Thornber md->era_array_root = le64_to_cpu(disk->era_array_root); 583eec40579SJoe Thornber md->metadata_snap = le64_to_cpu(disk->metadata_snap); 584eec40579SJoe Thornber md->archived_writesets = true; 585eec40579SJoe Thornber 5864c7da06fSMikulas Patocka dm_bm_unlock(sblock); 5874c7da06fSMikulas Patocka 5884c7da06fSMikulas Patocka return 0; 589eec40579SJoe Thornber 590eec40579SJoe Thornber bad: 591eec40579SJoe Thornber dm_bm_unlock(sblock); 592eec40579SJoe Thornber return r; 593eec40579SJoe Thornber } 594eec40579SJoe Thornber 595eec40579SJoe Thornber static int open_or_format_metadata(struct era_metadata *md, 596eec40579SJoe Thornber bool may_format) 597eec40579SJoe Thornber { 598eec40579SJoe Thornber int r; 599eec40579SJoe Thornber bool unformatted = false; 600eec40579SJoe Thornber 601eec40579SJoe Thornber r = superblock_all_zeroes(md->bm, &unformatted); 602eec40579SJoe Thornber if (r) 603eec40579SJoe Thornber return r; 604eec40579SJoe Thornber 605eec40579SJoe Thornber if (unformatted) 606eec40579SJoe Thornber return may_format ? format_metadata(md) : -EPERM; 607eec40579SJoe Thornber 608eec40579SJoe Thornber return open_metadata(md); 609eec40579SJoe Thornber } 610eec40579SJoe Thornber 611eec40579SJoe Thornber static int create_persistent_data_objects(struct era_metadata *md, 612eec40579SJoe Thornber bool may_format) 613eec40579SJoe Thornber { 614eec40579SJoe Thornber int r; 615eec40579SJoe Thornber 616eec40579SJoe Thornber md->bm = dm_block_manager_create(md->bdev, DM_ERA_METADATA_BLOCK_SIZE, 617eec40579SJoe Thornber ERA_MAX_CONCURRENT_LOCKS); 618eec40579SJoe Thornber if (IS_ERR(md->bm)) { 619eec40579SJoe Thornber DMERR("could not create block manager"); 620eec40579SJoe Thornber return PTR_ERR(md->bm); 621eec40579SJoe Thornber } 622eec40579SJoe Thornber 623eec40579SJoe Thornber r = open_or_format_metadata(md, may_format); 624eec40579SJoe Thornber if (r) 625eec40579SJoe Thornber dm_block_manager_destroy(md->bm); 626eec40579SJoe Thornber 627eec40579SJoe Thornber return r; 628eec40579SJoe Thornber } 629eec40579SJoe Thornber 630eec40579SJoe Thornber static void destroy_persistent_data_objects(struct era_metadata *md) 631eec40579SJoe Thornber { 632eec40579SJoe Thornber dm_sm_destroy(md->sm); 633eec40579SJoe Thornber dm_tm_destroy(md->tm); 634eec40579SJoe Thornber dm_block_manager_destroy(md->bm); 635eec40579SJoe Thornber } 636eec40579SJoe Thornber 637eec40579SJoe Thornber /* 638eec40579SJoe Thornber * This waits until all era_map threads have picked up the new filter. 639eec40579SJoe Thornber */ 640eec40579SJoe Thornber static void swap_writeset(struct era_metadata *md, struct writeset *new_writeset) 641eec40579SJoe Thornber { 642eec40579SJoe Thornber rcu_assign_pointer(md->current_writeset, new_writeset); 643eec40579SJoe Thornber synchronize_rcu(); 644eec40579SJoe Thornber } 645eec40579SJoe Thornber 646eec40579SJoe Thornber /*---------------------------------------------------------------- 647eec40579SJoe Thornber * Writesets get 'digested' into the main era array. 648eec40579SJoe Thornber * 649eec40579SJoe Thornber * We're using a coroutine here so the worker thread can do the digestion, 650eec40579SJoe Thornber * thus avoiding synchronisation of the metadata. Digesting a whole 651eec40579SJoe Thornber * writeset in one go would cause too much latency. 652eec40579SJoe Thornber *--------------------------------------------------------------*/ 653eec40579SJoe Thornber struct digest { 654eec40579SJoe Thornber uint32_t era; 655eec40579SJoe Thornber unsigned nr_bits, current_bit; 656eec40579SJoe Thornber struct writeset_metadata writeset; 657eec40579SJoe Thornber __le32 value; 658eec40579SJoe Thornber struct dm_disk_bitset info; 659eec40579SJoe Thornber 660eec40579SJoe Thornber int (*step)(struct era_metadata *, struct digest *); 661eec40579SJoe Thornber }; 662eec40579SJoe Thornber 663eec40579SJoe Thornber static int metadata_digest_lookup_writeset(struct era_metadata *md, 664eec40579SJoe Thornber struct digest *d); 665eec40579SJoe Thornber 666eec40579SJoe Thornber static int metadata_digest_remove_writeset(struct era_metadata *md, 667eec40579SJoe Thornber struct digest *d) 668eec40579SJoe Thornber { 669eec40579SJoe Thornber int r; 670eec40579SJoe Thornber uint64_t key = d->era; 671eec40579SJoe Thornber 672eec40579SJoe Thornber r = dm_btree_remove(&md->writeset_tree_info, md->writeset_tree_root, 673eec40579SJoe Thornber &key, &md->writeset_tree_root); 674eec40579SJoe Thornber if (r) { 675eec40579SJoe Thornber DMERR("%s: dm_btree_remove failed", __func__); 676eec40579SJoe Thornber return r; 677eec40579SJoe Thornber } 678eec40579SJoe Thornber 679eec40579SJoe Thornber d->step = metadata_digest_lookup_writeset; 680eec40579SJoe Thornber return 0; 681eec40579SJoe Thornber } 682eec40579SJoe Thornber 683eec40579SJoe Thornber #define INSERTS_PER_STEP 100 684eec40579SJoe Thornber 685eec40579SJoe Thornber static int metadata_digest_transcribe_writeset(struct era_metadata *md, 686eec40579SJoe Thornber struct digest *d) 687eec40579SJoe Thornber { 688eec40579SJoe Thornber int r; 689eec40579SJoe Thornber bool marked; 690eec40579SJoe Thornber unsigned b, e = min(d->current_bit + INSERTS_PER_STEP, d->nr_bits); 691eec40579SJoe Thornber 692eec40579SJoe Thornber for (b = d->current_bit; b < e; b++) { 693eec40579SJoe Thornber r = writeset_marked_on_disk(&d->info, &d->writeset, b, &marked); 694eec40579SJoe Thornber if (r) { 695eec40579SJoe Thornber DMERR("%s: writeset_marked_on_disk failed", __func__); 696eec40579SJoe Thornber return r; 697eec40579SJoe Thornber } 698eec40579SJoe Thornber 699eec40579SJoe Thornber if (!marked) 700eec40579SJoe Thornber continue; 701eec40579SJoe Thornber 702eec40579SJoe Thornber __dm_bless_for_disk(&d->value); 703eec40579SJoe Thornber r = dm_array_set_value(&md->era_array_info, md->era_array_root, 704eec40579SJoe Thornber b, &d->value, &md->era_array_root); 705eec40579SJoe Thornber if (r) { 706eec40579SJoe Thornber DMERR("%s: dm_array_set_value failed", __func__); 707eec40579SJoe Thornber return r; 708eec40579SJoe Thornber } 709eec40579SJoe Thornber } 710eec40579SJoe Thornber 711eec40579SJoe Thornber if (b == d->nr_bits) 712eec40579SJoe Thornber d->step = metadata_digest_remove_writeset; 713eec40579SJoe Thornber else 714eec40579SJoe Thornber d->current_bit = b; 715eec40579SJoe Thornber 716eec40579SJoe Thornber return 0; 717eec40579SJoe Thornber } 718eec40579SJoe Thornber 719eec40579SJoe Thornber static int metadata_digest_lookup_writeset(struct era_metadata *md, 720eec40579SJoe Thornber struct digest *d) 721eec40579SJoe Thornber { 722eec40579SJoe Thornber int r; 723eec40579SJoe Thornber uint64_t key; 724eec40579SJoe Thornber struct writeset_disk disk; 725eec40579SJoe Thornber 726eec40579SJoe Thornber r = dm_btree_find_lowest_key(&md->writeset_tree_info, 727eec40579SJoe Thornber md->writeset_tree_root, &key); 728eec40579SJoe Thornber if (r < 0) 729eec40579SJoe Thornber return r; 730eec40579SJoe Thornber 731eec40579SJoe Thornber d->era = key; 732eec40579SJoe Thornber 733eec40579SJoe Thornber r = dm_btree_lookup(&md->writeset_tree_info, 734eec40579SJoe Thornber md->writeset_tree_root, &key, &disk); 735eec40579SJoe Thornber if (r) { 736eec40579SJoe Thornber if (r == -ENODATA) { 737eec40579SJoe Thornber d->step = NULL; 738eec40579SJoe Thornber return 0; 739eec40579SJoe Thornber } 740eec40579SJoe Thornber 741eec40579SJoe Thornber DMERR("%s: dm_btree_lookup failed", __func__); 742eec40579SJoe Thornber return r; 743eec40579SJoe Thornber } 744eec40579SJoe Thornber 745eec40579SJoe Thornber ws_unpack(&disk, &d->writeset); 746eec40579SJoe Thornber d->value = cpu_to_le32(key); 747eec40579SJoe Thornber 748eec40579SJoe Thornber d->nr_bits = min(d->writeset.nr_bits, md->nr_blocks); 749eec40579SJoe Thornber d->current_bit = 0; 750eec40579SJoe Thornber d->step = metadata_digest_transcribe_writeset; 751eec40579SJoe Thornber 752eec40579SJoe Thornber return 0; 753eec40579SJoe Thornber } 754eec40579SJoe Thornber 755eec40579SJoe Thornber static int metadata_digest_start(struct era_metadata *md, struct digest *d) 756eec40579SJoe Thornber { 757eec40579SJoe Thornber if (d->step) 758eec40579SJoe Thornber return 0; 759eec40579SJoe Thornber 760eec40579SJoe Thornber memset(d, 0, sizeof(*d)); 761eec40579SJoe Thornber 762eec40579SJoe Thornber /* 763eec40579SJoe Thornber * We initialise another bitset info to avoid any caching side 764eec40579SJoe Thornber * effects with the previous one. 765eec40579SJoe Thornber */ 766eec40579SJoe Thornber dm_disk_bitset_init(md->tm, &d->info); 767eec40579SJoe Thornber d->step = metadata_digest_lookup_writeset; 768eec40579SJoe Thornber 769eec40579SJoe Thornber return 0; 770eec40579SJoe Thornber } 771eec40579SJoe Thornber 772eec40579SJoe Thornber /*---------------------------------------------------------------- 773eec40579SJoe Thornber * High level metadata interface. Target methods should use these, and not 774eec40579SJoe Thornber * the lower level ones. 775eec40579SJoe Thornber *--------------------------------------------------------------*/ 776eec40579SJoe Thornber static struct era_metadata *metadata_open(struct block_device *bdev, 777eec40579SJoe Thornber sector_t block_size, 778eec40579SJoe Thornber bool may_format) 779eec40579SJoe Thornber { 780eec40579SJoe Thornber int r; 781eec40579SJoe Thornber struct era_metadata *md = kzalloc(sizeof(*md), GFP_KERNEL); 782eec40579SJoe Thornber 783eec40579SJoe Thornber if (!md) 784eec40579SJoe Thornber return NULL; 785eec40579SJoe Thornber 786eec40579SJoe Thornber md->bdev = bdev; 787eec40579SJoe Thornber md->block_size = block_size; 788eec40579SJoe Thornber 789eec40579SJoe Thornber md->writesets[0].md.root = INVALID_WRITESET_ROOT; 790eec40579SJoe Thornber md->writesets[1].md.root = INVALID_WRITESET_ROOT; 791eec40579SJoe Thornber md->current_writeset = &md->writesets[0]; 792eec40579SJoe Thornber 793eec40579SJoe Thornber r = create_persistent_data_objects(md, may_format); 794eec40579SJoe Thornber if (r) { 795eec40579SJoe Thornber kfree(md); 796eec40579SJoe Thornber return ERR_PTR(r); 797eec40579SJoe Thornber } 798eec40579SJoe Thornber 799eec40579SJoe Thornber return md; 800eec40579SJoe Thornber } 801eec40579SJoe Thornber 802eec40579SJoe Thornber static void metadata_close(struct era_metadata *md) 803eec40579SJoe Thornber { 804eec40579SJoe Thornber destroy_persistent_data_objects(md); 805eec40579SJoe Thornber kfree(md); 806eec40579SJoe Thornber } 807eec40579SJoe Thornber 808eec40579SJoe Thornber static bool valid_nr_blocks(dm_block_t n) 809eec40579SJoe Thornber { 810eec40579SJoe Thornber /* 811eec40579SJoe Thornber * dm_bitset restricts us to 2^32. test_bit & co. restrict us 812eec40579SJoe Thornber * further to 2^31 - 1 813eec40579SJoe Thornber */ 814eec40579SJoe Thornber return n < (1ull << 31); 815eec40579SJoe Thornber } 816eec40579SJoe Thornber 817eec40579SJoe Thornber static int metadata_resize(struct era_metadata *md, void *arg) 818eec40579SJoe Thornber { 819eec40579SJoe Thornber int r; 820eec40579SJoe Thornber dm_block_t *new_size = arg; 821eec40579SJoe Thornber __le32 value; 822eec40579SJoe Thornber 823eec40579SJoe Thornber if (!valid_nr_blocks(*new_size)) { 824eec40579SJoe Thornber DMERR("Invalid number of origin blocks %llu", 825eec40579SJoe Thornber (unsigned long long) *new_size); 826eec40579SJoe Thornber return -EINVAL; 827eec40579SJoe Thornber } 828eec40579SJoe Thornber 829eec40579SJoe Thornber writeset_free(&md->writesets[0]); 830eec40579SJoe Thornber writeset_free(&md->writesets[1]); 831eec40579SJoe Thornber 832eec40579SJoe Thornber r = writeset_alloc(&md->writesets[0], *new_size); 833eec40579SJoe Thornber if (r) { 834eec40579SJoe Thornber DMERR("%s: writeset_alloc failed for writeset 0", __func__); 835eec40579SJoe Thornber return r; 836eec40579SJoe Thornber } 837eec40579SJoe Thornber 838eec40579SJoe Thornber r = writeset_alloc(&md->writesets[1], *new_size); 839eec40579SJoe Thornber if (r) { 840eec40579SJoe Thornber DMERR("%s: writeset_alloc failed for writeset 1", __func__); 841eec40579SJoe Thornber return r; 842eec40579SJoe Thornber } 843eec40579SJoe Thornber 844eec40579SJoe Thornber value = cpu_to_le32(0u); 845eec40579SJoe Thornber __dm_bless_for_disk(&value); 846eec40579SJoe Thornber r = dm_array_resize(&md->era_array_info, md->era_array_root, 847eec40579SJoe Thornber md->nr_blocks, *new_size, 848eec40579SJoe Thornber &value, &md->era_array_root); 849eec40579SJoe Thornber if (r) { 850eec40579SJoe Thornber DMERR("%s: dm_array_resize failed", __func__); 851eec40579SJoe Thornber return r; 852eec40579SJoe Thornber } 853eec40579SJoe Thornber 854eec40579SJoe Thornber md->nr_blocks = *new_size; 855eec40579SJoe Thornber return 0; 856eec40579SJoe Thornber } 857eec40579SJoe Thornber 858eec40579SJoe Thornber static int metadata_era_archive(struct era_metadata *md) 859eec40579SJoe Thornber { 860eec40579SJoe Thornber int r; 861eec40579SJoe Thornber uint64_t keys[1]; 862eec40579SJoe Thornber struct writeset_disk value; 863eec40579SJoe Thornber 864eec40579SJoe Thornber r = dm_bitset_flush(&md->bitset_info, md->current_writeset->md.root, 865eec40579SJoe Thornber &md->current_writeset->md.root); 866eec40579SJoe Thornber if (r) { 867eec40579SJoe Thornber DMERR("%s: dm_bitset_flush failed", __func__); 868eec40579SJoe Thornber return r; 869eec40579SJoe Thornber } 870eec40579SJoe Thornber 871eec40579SJoe Thornber ws_pack(&md->current_writeset->md, &value); 872eec40579SJoe Thornber md->current_writeset->md.root = INVALID_WRITESET_ROOT; 873eec40579SJoe Thornber 874eec40579SJoe Thornber keys[0] = md->current_era; 875eec40579SJoe Thornber __dm_bless_for_disk(&value); 876eec40579SJoe Thornber r = dm_btree_insert(&md->writeset_tree_info, md->writeset_tree_root, 877eec40579SJoe Thornber keys, &value, &md->writeset_tree_root); 878eec40579SJoe Thornber if (r) { 879eec40579SJoe Thornber DMERR("%s: couldn't insert writeset into btree", __func__); 880eec40579SJoe Thornber /* FIXME: fail mode */ 881eec40579SJoe Thornber return r; 882eec40579SJoe Thornber } 883eec40579SJoe Thornber 884eec40579SJoe Thornber md->archived_writesets = true; 885eec40579SJoe Thornber 886eec40579SJoe Thornber return 0; 887eec40579SJoe Thornber } 888eec40579SJoe Thornber 889eec40579SJoe Thornber static struct writeset *next_writeset(struct era_metadata *md) 890eec40579SJoe Thornber { 891eec40579SJoe Thornber return (md->current_writeset == &md->writesets[0]) ? 892eec40579SJoe Thornber &md->writesets[1] : &md->writesets[0]; 893eec40579SJoe Thornber } 894eec40579SJoe Thornber 895eec40579SJoe Thornber static int metadata_new_era(struct era_metadata *md) 896eec40579SJoe Thornber { 897eec40579SJoe Thornber int r; 898eec40579SJoe Thornber struct writeset *new_writeset = next_writeset(md); 899eec40579SJoe Thornber 900eec40579SJoe Thornber r = writeset_init(&md->bitset_info, new_writeset); 901eec40579SJoe Thornber if (r) { 902eec40579SJoe Thornber DMERR("%s: writeset_init failed", __func__); 903eec40579SJoe Thornber return r; 904eec40579SJoe Thornber } 905eec40579SJoe Thornber 906eec40579SJoe Thornber swap_writeset(md, new_writeset); 907eec40579SJoe Thornber md->current_era++; 908eec40579SJoe Thornber 909eec40579SJoe Thornber return 0; 910eec40579SJoe Thornber } 911eec40579SJoe Thornber 912eec40579SJoe Thornber static int metadata_era_rollover(struct era_metadata *md) 913eec40579SJoe Thornber { 914eec40579SJoe Thornber int r; 915eec40579SJoe Thornber 916eec40579SJoe Thornber if (md->current_writeset->md.root != INVALID_WRITESET_ROOT) { 917eec40579SJoe Thornber r = metadata_era_archive(md); 918eec40579SJoe Thornber if (r) { 919eec40579SJoe Thornber DMERR("%s: metadata_archive_era failed", __func__); 920eec40579SJoe Thornber /* FIXME: fail mode? */ 921eec40579SJoe Thornber return r; 922eec40579SJoe Thornber } 923eec40579SJoe Thornber } 924eec40579SJoe Thornber 925eec40579SJoe Thornber r = metadata_new_era(md); 926eec40579SJoe Thornber if (r) { 927eec40579SJoe Thornber DMERR("%s: new era failed", __func__); 928eec40579SJoe Thornber /* FIXME: fail mode */ 929eec40579SJoe Thornber return r; 930eec40579SJoe Thornber } 931eec40579SJoe Thornber 932eec40579SJoe Thornber return 0; 933eec40579SJoe Thornber } 934eec40579SJoe Thornber 935eec40579SJoe Thornber static bool metadata_current_marked(struct era_metadata *md, dm_block_t block) 936eec40579SJoe Thornber { 937eec40579SJoe Thornber bool r; 938eec40579SJoe Thornber struct writeset *ws; 939eec40579SJoe Thornber 940eec40579SJoe Thornber rcu_read_lock(); 941eec40579SJoe Thornber ws = rcu_dereference(md->current_writeset); 942eec40579SJoe Thornber r = writeset_marked(ws, block); 943eec40579SJoe Thornber rcu_read_unlock(); 944eec40579SJoe Thornber 945eec40579SJoe Thornber return r; 946eec40579SJoe Thornber } 947eec40579SJoe Thornber 948eec40579SJoe Thornber static int metadata_commit(struct era_metadata *md) 949eec40579SJoe Thornber { 950eec40579SJoe Thornber int r; 951eec40579SJoe Thornber struct dm_block *sblock; 952eec40579SJoe Thornber 953eec40579SJoe Thornber if (md->current_writeset->md.root != SUPERBLOCK_LOCATION) { 954eec40579SJoe Thornber r = dm_bitset_flush(&md->bitset_info, md->current_writeset->md.root, 955eec40579SJoe Thornber &md->current_writeset->md.root); 956eec40579SJoe Thornber if (r) { 957eec40579SJoe Thornber DMERR("%s: bitset flush failed", __func__); 958eec40579SJoe Thornber return r; 959eec40579SJoe Thornber } 960eec40579SJoe Thornber } 961eec40579SJoe Thornber 962eec40579SJoe Thornber r = dm_tm_pre_commit(md->tm); 963eec40579SJoe Thornber if (r) { 964eec40579SJoe Thornber DMERR("%s: pre commit failed", __func__); 965eec40579SJoe Thornber return r; 966eec40579SJoe Thornber } 967eec40579SJoe Thornber 968117aceb0SSomasundaram Krishnasamy r = save_sm_root(md); 969117aceb0SSomasundaram Krishnasamy if (r) { 970117aceb0SSomasundaram Krishnasamy DMERR("%s: save_sm_root failed", __func__); 971117aceb0SSomasundaram Krishnasamy return r; 972117aceb0SSomasundaram Krishnasamy } 973117aceb0SSomasundaram Krishnasamy 974eec40579SJoe Thornber r = superblock_lock(md, &sblock); 975eec40579SJoe Thornber if (r) { 976eec40579SJoe Thornber DMERR("%s: superblock lock failed", __func__); 977eec40579SJoe Thornber return r; 978eec40579SJoe Thornber } 979eec40579SJoe Thornber 9805a32083dSJoe Thornber prepare_superblock(md, dm_block_data(sblock)); 981eec40579SJoe Thornber 982eec40579SJoe Thornber return dm_tm_commit(md->tm, sblock); 983eec40579SJoe Thornber } 984eec40579SJoe Thornber 985eec40579SJoe Thornber static int metadata_checkpoint(struct era_metadata *md) 986eec40579SJoe Thornber { 987eec40579SJoe Thornber /* 988eec40579SJoe Thornber * For now we just rollover, but later I want to put a check in to 989eec40579SJoe Thornber * avoid this if the filter is still pretty fresh. 990eec40579SJoe Thornber */ 991eec40579SJoe Thornber return metadata_era_rollover(md); 992eec40579SJoe Thornber } 993eec40579SJoe Thornber 994eec40579SJoe Thornber /* 995eec40579SJoe Thornber * Metadata snapshots allow userland to access era data. 996eec40579SJoe Thornber */ 997eec40579SJoe Thornber static int metadata_take_snap(struct era_metadata *md) 998eec40579SJoe Thornber { 999eec40579SJoe Thornber int r, inc; 1000eec40579SJoe Thornber struct dm_block *clone; 1001eec40579SJoe Thornber 1002eec40579SJoe Thornber if (md->metadata_snap != SUPERBLOCK_LOCATION) { 1003eec40579SJoe Thornber DMERR("%s: metadata snapshot already exists", __func__); 1004eec40579SJoe Thornber return -EINVAL; 1005eec40579SJoe Thornber } 1006eec40579SJoe Thornber 1007eec40579SJoe Thornber r = metadata_era_rollover(md); 1008eec40579SJoe Thornber if (r) { 1009eec40579SJoe Thornber DMERR("%s: era rollover failed", __func__); 1010eec40579SJoe Thornber return r; 1011eec40579SJoe Thornber } 1012eec40579SJoe Thornber 1013eec40579SJoe Thornber r = metadata_commit(md); 1014eec40579SJoe Thornber if (r) { 1015eec40579SJoe Thornber DMERR("%s: pre commit failed", __func__); 1016eec40579SJoe Thornber return r; 1017eec40579SJoe Thornber } 1018eec40579SJoe Thornber 1019eec40579SJoe Thornber r = dm_sm_inc_block(md->sm, SUPERBLOCK_LOCATION); 1020eec40579SJoe Thornber if (r) { 1021eec40579SJoe Thornber DMERR("%s: couldn't increment superblock", __func__); 1022eec40579SJoe Thornber return r; 1023eec40579SJoe Thornber } 1024eec40579SJoe Thornber 1025eec40579SJoe Thornber r = dm_tm_shadow_block(md->tm, SUPERBLOCK_LOCATION, 1026eec40579SJoe Thornber &sb_validator, &clone, &inc); 1027eec40579SJoe Thornber if (r) { 1028eec40579SJoe Thornber DMERR("%s: couldn't shadow superblock", __func__); 1029eec40579SJoe Thornber dm_sm_dec_block(md->sm, SUPERBLOCK_LOCATION); 1030eec40579SJoe Thornber return r; 1031eec40579SJoe Thornber } 1032eec40579SJoe Thornber BUG_ON(!inc); 1033eec40579SJoe Thornber 1034eec40579SJoe Thornber r = dm_sm_inc_block(md->sm, md->writeset_tree_root); 1035eec40579SJoe Thornber if (r) { 1036eec40579SJoe Thornber DMERR("%s: couldn't inc writeset tree root", __func__); 1037eec40579SJoe Thornber dm_tm_unlock(md->tm, clone); 1038eec40579SJoe Thornber return r; 1039eec40579SJoe Thornber } 1040eec40579SJoe Thornber 1041eec40579SJoe Thornber r = dm_sm_inc_block(md->sm, md->era_array_root); 1042eec40579SJoe Thornber if (r) { 1043eec40579SJoe Thornber DMERR("%s: couldn't inc era tree root", __func__); 1044eec40579SJoe Thornber dm_sm_dec_block(md->sm, md->writeset_tree_root); 1045eec40579SJoe Thornber dm_tm_unlock(md->tm, clone); 1046eec40579SJoe Thornber return r; 1047eec40579SJoe Thornber } 1048eec40579SJoe Thornber 1049eec40579SJoe Thornber md->metadata_snap = dm_block_location(clone); 1050eec40579SJoe Thornber 10514c7da06fSMikulas Patocka dm_tm_unlock(md->tm, clone); 1052eec40579SJoe Thornber 1053eec40579SJoe Thornber return 0; 1054eec40579SJoe Thornber } 1055eec40579SJoe Thornber 1056eec40579SJoe Thornber static int metadata_drop_snap(struct era_metadata *md) 1057eec40579SJoe Thornber { 1058eec40579SJoe Thornber int r; 1059eec40579SJoe Thornber dm_block_t location; 1060eec40579SJoe Thornber struct dm_block *clone; 1061eec40579SJoe Thornber struct superblock_disk *disk; 1062eec40579SJoe Thornber 1063eec40579SJoe Thornber if (md->metadata_snap == SUPERBLOCK_LOCATION) { 1064eec40579SJoe Thornber DMERR("%s: no snap to drop", __func__); 1065eec40579SJoe Thornber return -EINVAL; 1066eec40579SJoe Thornber } 1067eec40579SJoe Thornber 1068eec40579SJoe Thornber r = dm_tm_read_lock(md->tm, md->metadata_snap, &sb_validator, &clone); 1069eec40579SJoe Thornber if (r) { 1070eec40579SJoe Thornber DMERR("%s: couldn't read lock superblock clone", __func__); 1071eec40579SJoe Thornber return r; 1072eec40579SJoe Thornber } 1073eec40579SJoe Thornber 1074eec40579SJoe Thornber /* 1075eec40579SJoe Thornber * Whatever happens now we'll commit with no record of the metadata 1076eec40579SJoe Thornber * snap. 1077eec40579SJoe Thornber */ 1078eec40579SJoe Thornber md->metadata_snap = SUPERBLOCK_LOCATION; 1079eec40579SJoe Thornber 1080eec40579SJoe Thornber disk = dm_block_data(clone); 1081eec40579SJoe Thornber r = dm_btree_del(&md->writeset_tree_info, 1082eec40579SJoe Thornber le64_to_cpu(disk->writeset_tree_root)); 1083eec40579SJoe Thornber if (r) { 1084eec40579SJoe Thornber DMERR("%s: error deleting writeset tree clone", __func__); 1085eec40579SJoe Thornber dm_tm_unlock(md->tm, clone); 1086eec40579SJoe Thornber return r; 1087eec40579SJoe Thornber } 1088eec40579SJoe Thornber 1089eec40579SJoe Thornber r = dm_array_del(&md->era_array_info, le64_to_cpu(disk->era_array_root)); 1090eec40579SJoe Thornber if (r) { 1091eec40579SJoe Thornber DMERR("%s: error deleting era array clone", __func__); 1092eec40579SJoe Thornber dm_tm_unlock(md->tm, clone); 1093eec40579SJoe Thornber return r; 1094eec40579SJoe Thornber } 1095eec40579SJoe Thornber 1096eec40579SJoe Thornber location = dm_block_location(clone); 1097eec40579SJoe Thornber dm_tm_unlock(md->tm, clone); 1098eec40579SJoe Thornber 1099eec40579SJoe Thornber return dm_sm_dec_block(md->sm, location); 1100eec40579SJoe Thornber } 1101eec40579SJoe Thornber 1102eec40579SJoe Thornber struct metadata_stats { 1103eec40579SJoe Thornber dm_block_t used; 1104eec40579SJoe Thornber dm_block_t total; 1105eec40579SJoe Thornber dm_block_t snap; 1106eec40579SJoe Thornber uint32_t era; 1107eec40579SJoe Thornber }; 1108eec40579SJoe Thornber 1109eec40579SJoe Thornber static int metadata_get_stats(struct era_metadata *md, void *ptr) 1110eec40579SJoe Thornber { 1111eec40579SJoe Thornber int r; 1112eec40579SJoe Thornber struct metadata_stats *s = ptr; 1113eec40579SJoe Thornber dm_block_t nr_free, nr_total; 1114eec40579SJoe Thornber 1115eec40579SJoe Thornber r = dm_sm_get_nr_free(md->sm, &nr_free); 1116eec40579SJoe Thornber if (r) { 1117eec40579SJoe Thornber DMERR("dm_sm_get_nr_free returned %d", r); 1118eec40579SJoe Thornber return r; 1119eec40579SJoe Thornber } 1120eec40579SJoe Thornber 1121eec40579SJoe Thornber r = dm_sm_get_nr_blocks(md->sm, &nr_total); 1122eec40579SJoe Thornber if (r) { 1123eec40579SJoe Thornber DMERR("dm_pool_get_metadata_dev_size returned %d", r); 1124eec40579SJoe Thornber return r; 1125eec40579SJoe Thornber } 1126eec40579SJoe Thornber 1127eec40579SJoe Thornber s->used = nr_total - nr_free; 1128eec40579SJoe Thornber s->total = nr_total; 1129eec40579SJoe Thornber s->snap = md->metadata_snap; 1130eec40579SJoe Thornber s->era = md->current_era; 1131eec40579SJoe Thornber 1132eec40579SJoe Thornber return 0; 1133eec40579SJoe Thornber } 1134eec40579SJoe Thornber 1135eec40579SJoe Thornber /*----------------------------------------------------------------*/ 1136eec40579SJoe Thornber 1137eec40579SJoe Thornber struct era { 1138eec40579SJoe Thornber struct dm_target *ti; 1139eec40579SJoe Thornber struct dm_target_callbacks callbacks; 1140eec40579SJoe Thornber 1141eec40579SJoe Thornber struct dm_dev *metadata_dev; 1142eec40579SJoe Thornber struct dm_dev *origin_dev; 1143eec40579SJoe Thornber 1144eec40579SJoe Thornber dm_block_t nr_blocks; 1145eec40579SJoe Thornber uint32_t sectors_per_block; 1146eec40579SJoe Thornber int sectors_per_block_shift; 1147eec40579SJoe Thornber struct era_metadata *md; 1148eec40579SJoe Thornber 1149eec40579SJoe Thornber struct workqueue_struct *wq; 1150eec40579SJoe Thornber struct work_struct worker; 1151eec40579SJoe Thornber 1152eec40579SJoe Thornber spinlock_t deferred_lock; 1153eec40579SJoe Thornber struct bio_list deferred_bios; 1154eec40579SJoe Thornber 1155eec40579SJoe Thornber spinlock_t rpc_lock; 1156eec40579SJoe Thornber struct list_head rpc_calls; 1157eec40579SJoe Thornber 1158eec40579SJoe Thornber struct digest digest; 1159eec40579SJoe Thornber atomic_t suspended; 1160eec40579SJoe Thornber }; 1161eec40579SJoe Thornber 1162eec40579SJoe Thornber struct rpc { 1163eec40579SJoe Thornber struct list_head list; 1164eec40579SJoe Thornber 1165eec40579SJoe Thornber int (*fn0)(struct era_metadata *); 1166eec40579SJoe Thornber int (*fn1)(struct era_metadata *, void *); 1167eec40579SJoe Thornber void *arg; 1168eec40579SJoe Thornber int result; 1169eec40579SJoe Thornber 1170eec40579SJoe Thornber struct completion complete; 1171eec40579SJoe Thornber }; 1172eec40579SJoe Thornber 1173eec40579SJoe Thornber /*---------------------------------------------------------------- 1174eec40579SJoe Thornber * Remapping. 1175eec40579SJoe Thornber *---------------------------------------------------------------*/ 1176eec40579SJoe Thornber static bool block_size_is_power_of_two(struct era *era) 1177eec40579SJoe Thornber { 1178eec40579SJoe Thornber return era->sectors_per_block_shift >= 0; 1179eec40579SJoe Thornber } 1180eec40579SJoe Thornber 1181eec40579SJoe Thornber static dm_block_t get_block(struct era *era, struct bio *bio) 1182eec40579SJoe Thornber { 1183eec40579SJoe Thornber sector_t block_nr = bio->bi_iter.bi_sector; 1184eec40579SJoe Thornber 1185eec40579SJoe Thornber if (!block_size_is_power_of_two(era)) 1186eec40579SJoe Thornber (void) sector_div(block_nr, era->sectors_per_block); 1187eec40579SJoe Thornber else 1188eec40579SJoe Thornber block_nr >>= era->sectors_per_block_shift; 1189eec40579SJoe Thornber 1190eec40579SJoe Thornber return block_nr; 1191eec40579SJoe Thornber } 1192eec40579SJoe Thornber 1193eec40579SJoe Thornber static void remap_to_origin(struct era *era, struct bio *bio) 1194eec40579SJoe Thornber { 1195*74d46992SChristoph Hellwig bio_set_dev(bio, era->origin_dev->bdev); 1196eec40579SJoe Thornber } 1197eec40579SJoe Thornber 1198eec40579SJoe Thornber /*---------------------------------------------------------------- 1199eec40579SJoe Thornber * Worker thread 1200eec40579SJoe Thornber *--------------------------------------------------------------*/ 1201eec40579SJoe Thornber static void wake_worker(struct era *era) 1202eec40579SJoe Thornber { 1203eec40579SJoe Thornber if (!atomic_read(&era->suspended)) 1204eec40579SJoe Thornber queue_work(era->wq, &era->worker); 1205eec40579SJoe Thornber } 1206eec40579SJoe Thornber 1207eec40579SJoe Thornber static void process_old_eras(struct era *era) 1208eec40579SJoe Thornber { 1209eec40579SJoe Thornber int r; 1210eec40579SJoe Thornber 1211eec40579SJoe Thornber if (!era->digest.step) 1212eec40579SJoe Thornber return; 1213eec40579SJoe Thornber 1214eec40579SJoe Thornber r = era->digest.step(era->md, &era->digest); 1215eec40579SJoe Thornber if (r < 0) { 1216eec40579SJoe Thornber DMERR("%s: digest step failed, stopping digestion", __func__); 1217eec40579SJoe Thornber era->digest.step = NULL; 1218eec40579SJoe Thornber 1219eec40579SJoe Thornber } else if (era->digest.step) 1220eec40579SJoe Thornber wake_worker(era); 1221eec40579SJoe Thornber } 1222eec40579SJoe Thornber 1223eec40579SJoe Thornber static void process_deferred_bios(struct era *era) 1224eec40579SJoe Thornber { 1225eec40579SJoe Thornber int r; 1226eec40579SJoe Thornber struct bio_list deferred_bios, marked_bios; 1227eec40579SJoe Thornber struct bio *bio; 1228eec40579SJoe Thornber bool commit_needed = false; 1229eec40579SJoe Thornber bool failed = false; 1230eec40579SJoe Thornber 1231eec40579SJoe Thornber bio_list_init(&deferred_bios); 1232eec40579SJoe Thornber bio_list_init(&marked_bios); 1233eec40579SJoe Thornber 1234eec40579SJoe Thornber spin_lock(&era->deferred_lock); 1235eec40579SJoe Thornber bio_list_merge(&deferred_bios, &era->deferred_bios); 1236eec40579SJoe Thornber bio_list_init(&era->deferred_bios); 1237eec40579SJoe Thornber spin_unlock(&era->deferred_lock); 1238eec40579SJoe Thornber 1239eec40579SJoe Thornber while ((bio = bio_list_pop(&deferred_bios))) { 1240eec40579SJoe Thornber r = writeset_test_and_set(&era->md->bitset_info, 1241eec40579SJoe Thornber era->md->current_writeset, 1242eec40579SJoe Thornber get_block(era, bio)); 1243eec40579SJoe Thornber if (r < 0) { 1244eec40579SJoe Thornber /* 1245eec40579SJoe Thornber * This is bad news, we need to rollback. 1246eec40579SJoe Thornber * FIXME: finish. 1247eec40579SJoe Thornber */ 1248eec40579SJoe Thornber failed = true; 1249eec40579SJoe Thornber 1250eec40579SJoe Thornber } else if (r == 0) 1251eec40579SJoe Thornber commit_needed = true; 1252eec40579SJoe Thornber 1253eec40579SJoe Thornber bio_list_add(&marked_bios, bio); 1254eec40579SJoe Thornber } 1255eec40579SJoe Thornber 1256eec40579SJoe Thornber if (commit_needed) { 1257eec40579SJoe Thornber r = metadata_commit(era->md); 1258eec40579SJoe Thornber if (r) 1259eec40579SJoe Thornber failed = true; 1260eec40579SJoe Thornber } 1261eec40579SJoe Thornber 1262eec40579SJoe Thornber if (failed) 1263eec40579SJoe Thornber while ((bio = bio_list_pop(&marked_bios))) 1264eec40579SJoe Thornber bio_io_error(bio); 1265eec40579SJoe Thornber else 1266eec40579SJoe Thornber while ((bio = bio_list_pop(&marked_bios))) 1267eec40579SJoe Thornber generic_make_request(bio); 1268eec40579SJoe Thornber } 1269eec40579SJoe Thornber 1270eec40579SJoe Thornber static void process_rpc_calls(struct era *era) 1271eec40579SJoe Thornber { 1272eec40579SJoe Thornber int r; 1273eec40579SJoe Thornber bool need_commit = false; 1274eec40579SJoe Thornber struct list_head calls; 1275eec40579SJoe Thornber struct rpc *rpc, *tmp; 1276eec40579SJoe Thornber 1277eec40579SJoe Thornber INIT_LIST_HEAD(&calls); 1278eec40579SJoe Thornber spin_lock(&era->rpc_lock); 1279eec40579SJoe Thornber list_splice_init(&era->rpc_calls, &calls); 1280eec40579SJoe Thornber spin_unlock(&era->rpc_lock); 1281eec40579SJoe Thornber 1282eec40579SJoe Thornber list_for_each_entry_safe(rpc, tmp, &calls, list) { 1283eec40579SJoe Thornber rpc->result = rpc->fn0 ? rpc->fn0(era->md) : rpc->fn1(era->md, rpc->arg); 1284eec40579SJoe Thornber need_commit = true; 1285eec40579SJoe Thornber } 1286eec40579SJoe Thornber 1287eec40579SJoe Thornber if (need_commit) { 1288eec40579SJoe Thornber r = metadata_commit(era->md); 1289eec40579SJoe Thornber if (r) 1290eec40579SJoe Thornber list_for_each_entry_safe(rpc, tmp, &calls, list) 1291eec40579SJoe Thornber rpc->result = r; 1292eec40579SJoe Thornber } 1293eec40579SJoe Thornber 1294eec40579SJoe Thornber list_for_each_entry_safe(rpc, tmp, &calls, list) 1295eec40579SJoe Thornber complete(&rpc->complete); 1296eec40579SJoe Thornber } 1297eec40579SJoe Thornber 1298eec40579SJoe Thornber static void kick_off_digest(struct era *era) 1299eec40579SJoe Thornber { 1300eec40579SJoe Thornber if (era->md->archived_writesets) { 1301eec40579SJoe Thornber era->md->archived_writesets = false; 1302eec40579SJoe Thornber metadata_digest_start(era->md, &era->digest); 1303eec40579SJoe Thornber } 1304eec40579SJoe Thornber } 1305eec40579SJoe Thornber 1306eec40579SJoe Thornber static void do_work(struct work_struct *ws) 1307eec40579SJoe Thornber { 1308eec40579SJoe Thornber struct era *era = container_of(ws, struct era, worker); 1309eec40579SJoe Thornber 1310eec40579SJoe Thornber kick_off_digest(era); 1311eec40579SJoe Thornber process_old_eras(era); 1312eec40579SJoe Thornber process_deferred_bios(era); 1313eec40579SJoe Thornber process_rpc_calls(era); 1314eec40579SJoe Thornber } 1315eec40579SJoe Thornber 1316eec40579SJoe Thornber static void defer_bio(struct era *era, struct bio *bio) 1317eec40579SJoe Thornber { 1318eec40579SJoe Thornber spin_lock(&era->deferred_lock); 1319eec40579SJoe Thornber bio_list_add(&era->deferred_bios, bio); 1320eec40579SJoe Thornber spin_unlock(&era->deferred_lock); 1321eec40579SJoe Thornber 1322eec40579SJoe Thornber wake_worker(era); 1323eec40579SJoe Thornber } 1324eec40579SJoe Thornber 1325eec40579SJoe Thornber /* 1326eec40579SJoe Thornber * Make an rpc call to the worker to change the metadata. 1327eec40579SJoe Thornber */ 1328eec40579SJoe Thornber static int perform_rpc(struct era *era, struct rpc *rpc) 1329eec40579SJoe Thornber { 1330eec40579SJoe Thornber rpc->result = 0; 1331eec40579SJoe Thornber init_completion(&rpc->complete); 1332eec40579SJoe Thornber 1333eec40579SJoe Thornber spin_lock(&era->rpc_lock); 1334eec40579SJoe Thornber list_add(&rpc->list, &era->rpc_calls); 1335eec40579SJoe Thornber spin_unlock(&era->rpc_lock); 1336eec40579SJoe Thornber 1337eec40579SJoe Thornber wake_worker(era); 1338eec40579SJoe Thornber wait_for_completion(&rpc->complete); 1339eec40579SJoe Thornber 1340eec40579SJoe Thornber return rpc->result; 1341eec40579SJoe Thornber } 1342eec40579SJoe Thornber 1343eec40579SJoe Thornber static int in_worker0(struct era *era, int (*fn)(struct era_metadata *)) 1344eec40579SJoe Thornber { 1345eec40579SJoe Thornber struct rpc rpc; 1346eec40579SJoe Thornber rpc.fn0 = fn; 1347eec40579SJoe Thornber rpc.fn1 = NULL; 1348eec40579SJoe Thornber 1349eec40579SJoe Thornber return perform_rpc(era, &rpc); 1350eec40579SJoe Thornber } 1351eec40579SJoe Thornber 1352eec40579SJoe Thornber static int in_worker1(struct era *era, 1353eec40579SJoe Thornber int (*fn)(struct era_metadata *, void *), void *arg) 1354eec40579SJoe Thornber { 1355eec40579SJoe Thornber struct rpc rpc; 1356eec40579SJoe Thornber rpc.fn0 = NULL; 1357eec40579SJoe Thornber rpc.fn1 = fn; 1358eec40579SJoe Thornber rpc.arg = arg; 1359eec40579SJoe Thornber 1360eec40579SJoe Thornber return perform_rpc(era, &rpc); 1361eec40579SJoe Thornber } 1362eec40579SJoe Thornber 1363eec40579SJoe Thornber static void start_worker(struct era *era) 1364eec40579SJoe Thornber { 1365eec40579SJoe Thornber atomic_set(&era->suspended, 0); 1366eec40579SJoe Thornber } 1367eec40579SJoe Thornber 1368eec40579SJoe Thornber static void stop_worker(struct era *era) 1369eec40579SJoe Thornber { 1370eec40579SJoe Thornber atomic_set(&era->suspended, 1); 1371eec40579SJoe Thornber flush_workqueue(era->wq); 1372eec40579SJoe Thornber } 1373eec40579SJoe Thornber 1374eec40579SJoe Thornber /*---------------------------------------------------------------- 1375eec40579SJoe Thornber * Target methods 1376eec40579SJoe Thornber *--------------------------------------------------------------*/ 1377eec40579SJoe Thornber static int dev_is_congested(struct dm_dev *dev, int bdi_bits) 1378eec40579SJoe Thornber { 1379eec40579SJoe Thornber struct request_queue *q = bdev_get_queue(dev->bdev); 1380dc3b17ccSJan Kara return bdi_congested(q->backing_dev_info, bdi_bits); 1381eec40579SJoe Thornber } 1382eec40579SJoe Thornber 1383eec40579SJoe Thornber static int era_is_congested(struct dm_target_callbacks *cb, int bdi_bits) 1384eec40579SJoe Thornber { 1385eec40579SJoe Thornber struct era *era = container_of(cb, struct era, callbacks); 1386eec40579SJoe Thornber return dev_is_congested(era->origin_dev, bdi_bits); 1387eec40579SJoe Thornber } 1388eec40579SJoe Thornber 1389eec40579SJoe Thornber static void era_destroy(struct era *era) 1390eec40579SJoe Thornber { 1391989f26f5SJoe Thornber if (era->md) 1392eec40579SJoe Thornber metadata_close(era->md); 1393eec40579SJoe Thornber 1394eec40579SJoe Thornber if (era->wq) 1395eec40579SJoe Thornber destroy_workqueue(era->wq); 1396eec40579SJoe Thornber 1397eec40579SJoe Thornber if (era->origin_dev) 1398eec40579SJoe Thornber dm_put_device(era->ti, era->origin_dev); 1399eec40579SJoe Thornber 1400eec40579SJoe Thornber if (era->metadata_dev) 1401eec40579SJoe Thornber dm_put_device(era->ti, era->metadata_dev); 1402eec40579SJoe Thornber 1403eec40579SJoe Thornber kfree(era); 1404eec40579SJoe Thornber } 1405eec40579SJoe Thornber 1406eec40579SJoe Thornber static dm_block_t calc_nr_blocks(struct era *era) 1407eec40579SJoe Thornber { 1408eec40579SJoe Thornber return dm_sector_div_up(era->ti->len, era->sectors_per_block); 1409eec40579SJoe Thornber } 1410eec40579SJoe Thornber 1411eec40579SJoe Thornber static bool valid_block_size(dm_block_t block_size) 1412eec40579SJoe Thornber { 1413eec40579SJoe Thornber bool greater_than_zero = block_size > 0; 1414eec40579SJoe Thornber bool multiple_of_min_block_size = (block_size & (MIN_BLOCK_SIZE - 1)) == 0; 1415eec40579SJoe Thornber 1416eec40579SJoe Thornber return greater_than_zero && multiple_of_min_block_size; 1417eec40579SJoe Thornber } 1418eec40579SJoe Thornber 1419eec40579SJoe Thornber /* 1420eec40579SJoe Thornber * <metadata dev> <data dev> <data block size (sectors)> 1421eec40579SJoe Thornber */ 1422eec40579SJoe Thornber static int era_ctr(struct dm_target *ti, unsigned argc, char **argv) 1423eec40579SJoe Thornber { 1424eec40579SJoe Thornber int r; 1425eec40579SJoe Thornber char dummy; 1426eec40579SJoe Thornber struct era *era; 1427eec40579SJoe Thornber struct era_metadata *md; 1428eec40579SJoe Thornber 1429eec40579SJoe Thornber if (argc != 3) { 1430eec40579SJoe Thornber ti->error = "Invalid argument count"; 1431eec40579SJoe Thornber return -EINVAL; 1432eec40579SJoe Thornber } 1433eec40579SJoe Thornber 1434eec40579SJoe Thornber era = kzalloc(sizeof(*era), GFP_KERNEL); 1435eec40579SJoe Thornber if (!era) { 1436eec40579SJoe Thornber ti->error = "Error allocating era structure"; 1437eec40579SJoe Thornber return -ENOMEM; 1438eec40579SJoe Thornber } 1439eec40579SJoe Thornber 1440eec40579SJoe Thornber era->ti = ti; 1441eec40579SJoe Thornber 1442eec40579SJoe Thornber r = dm_get_device(ti, argv[0], FMODE_READ | FMODE_WRITE, &era->metadata_dev); 1443eec40579SJoe Thornber if (r) { 1444eec40579SJoe Thornber ti->error = "Error opening metadata device"; 1445eec40579SJoe Thornber era_destroy(era); 1446eec40579SJoe Thornber return -EINVAL; 1447eec40579SJoe Thornber } 1448eec40579SJoe Thornber 1449eec40579SJoe Thornber r = dm_get_device(ti, argv[1], FMODE_READ | FMODE_WRITE, &era->origin_dev); 1450eec40579SJoe Thornber if (r) { 1451eec40579SJoe Thornber ti->error = "Error opening data device"; 1452eec40579SJoe Thornber era_destroy(era); 1453eec40579SJoe Thornber return -EINVAL; 1454eec40579SJoe Thornber } 1455eec40579SJoe Thornber 1456eec40579SJoe Thornber r = sscanf(argv[2], "%u%c", &era->sectors_per_block, &dummy); 1457eec40579SJoe Thornber if (r != 1) { 1458eec40579SJoe Thornber ti->error = "Error parsing block size"; 1459eec40579SJoe Thornber era_destroy(era); 1460eec40579SJoe Thornber return -EINVAL; 1461eec40579SJoe Thornber } 1462eec40579SJoe Thornber 1463eec40579SJoe Thornber r = dm_set_target_max_io_len(ti, era->sectors_per_block); 1464eec40579SJoe Thornber if (r) { 1465eec40579SJoe Thornber ti->error = "could not set max io len"; 1466eec40579SJoe Thornber era_destroy(era); 1467eec40579SJoe Thornber return -EINVAL; 1468eec40579SJoe Thornber } 1469eec40579SJoe Thornber 1470eec40579SJoe Thornber if (!valid_block_size(era->sectors_per_block)) { 1471eec40579SJoe Thornber ti->error = "Invalid block size"; 1472eec40579SJoe Thornber era_destroy(era); 1473eec40579SJoe Thornber return -EINVAL; 1474eec40579SJoe Thornber } 1475eec40579SJoe Thornber if (era->sectors_per_block & (era->sectors_per_block - 1)) 1476eec40579SJoe Thornber era->sectors_per_block_shift = -1; 1477eec40579SJoe Thornber else 1478eec40579SJoe Thornber era->sectors_per_block_shift = __ffs(era->sectors_per_block); 1479eec40579SJoe Thornber 1480eec40579SJoe Thornber md = metadata_open(era->metadata_dev->bdev, era->sectors_per_block, true); 1481eec40579SJoe Thornber if (IS_ERR(md)) { 1482eec40579SJoe Thornber ti->error = "Error reading metadata"; 1483eec40579SJoe Thornber era_destroy(era); 1484eec40579SJoe Thornber return PTR_ERR(md); 1485eec40579SJoe Thornber } 1486eec40579SJoe Thornber era->md = md; 1487eec40579SJoe Thornber 1488eec40579SJoe Thornber era->nr_blocks = calc_nr_blocks(era); 1489eec40579SJoe Thornber 1490eec40579SJoe Thornber r = metadata_resize(era->md, &era->nr_blocks); 1491eec40579SJoe Thornber if (r) { 1492eec40579SJoe Thornber ti->error = "couldn't resize metadata"; 1493eec40579SJoe Thornber era_destroy(era); 1494eec40579SJoe Thornber return -ENOMEM; 1495eec40579SJoe Thornber } 1496eec40579SJoe Thornber 1497eec40579SJoe Thornber era->wq = alloc_ordered_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM); 1498eec40579SJoe Thornber if (!era->wq) { 1499eec40579SJoe Thornber ti->error = "could not create workqueue for metadata object"; 1500eec40579SJoe Thornber era_destroy(era); 1501eec40579SJoe Thornber return -ENOMEM; 1502eec40579SJoe Thornber } 1503eec40579SJoe Thornber INIT_WORK(&era->worker, do_work); 1504eec40579SJoe Thornber 1505eec40579SJoe Thornber spin_lock_init(&era->deferred_lock); 1506eec40579SJoe Thornber bio_list_init(&era->deferred_bios); 1507eec40579SJoe Thornber 1508eec40579SJoe Thornber spin_lock_init(&era->rpc_lock); 1509eec40579SJoe Thornber INIT_LIST_HEAD(&era->rpc_calls); 1510eec40579SJoe Thornber 1511eec40579SJoe Thornber ti->private = era; 1512eec40579SJoe Thornber ti->num_flush_bios = 1; 1513eec40579SJoe Thornber ti->flush_supported = true; 1514eec40579SJoe Thornber 1515eec40579SJoe Thornber ti->num_discard_bios = 1; 1516eec40579SJoe Thornber ti->discards_supported = true; 1517eec40579SJoe Thornber era->callbacks.congested_fn = era_is_congested; 1518eec40579SJoe Thornber dm_table_add_target_callbacks(ti->table, &era->callbacks); 1519eec40579SJoe Thornber 1520eec40579SJoe Thornber return 0; 1521eec40579SJoe Thornber } 1522eec40579SJoe Thornber 1523eec40579SJoe Thornber static void era_dtr(struct dm_target *ti) 1524eec40579SJoe Thornber { 1525eec40579SJoe Thornber era_destroy(ti->private); 1526eec40579SJoe Thornber } 1527eec40579SJoe Thornber 1528eec40579SJoe Thornber static int era_map(struct dm_target *ti, struct bio *bio) 1529eec40579SJoe Thornber { 1530eec40579SJoe Thornber struct era *era = ti->private; 1531eec40579SJoe Thornber dm_block_t block = get_block(era, bio); 1532eec40579SJoe Thornber 1533eec40579SJoe Thornber /* 1534eec40579SJoe Thornber * All bios get remapped to the origin device. We do this now, but 1535eec40579SJoe Thornber * it may not get issued until later. Depending on whether the 1536eec40579SJoe Thornber * block is marked in this era. 1537eec40579SJoe Thornber */ 1538eec40579SJoe Thornber remap_to_origin(era, bio); 1539eec40579SJoe Thornber 1540eec40579SJoe Thornber /* 154128a8f0d3SMike Christie * REQ_PREFLUSH bios carry no data, so we're not interested in them. 1542eec40579SJoe Thornber */ 15431eff9d32SJens Axboe if (!(bio->bi_opf & REQ_PREFLUSH) && 1544eec40579SJoe Thornber (bio_data_dir(bio) == WRITE) && 1545eec40579SJoe Thornber !metadata_current_marked(era->md, block)) { 1546eec40579SJoe Thornber defer_bio(era, bio); 1547eec40579SJoe Thornber return DM_MAPIO_SUBMITTED; 1548eec40579SJoe Thornber } 1549eec40579SJoe Thornber 1550eec40579SJoe Thornber return DM_MAPIO_REMAPPED; 1551eec40579SJoe Thornber } 1552eec40579SJoe Thornber 1553eec40579SJoe Thornber static void era_postsuspend(struct dm_target *ti) 1554eec40579SJoe Thornber { 1555eec40579SJoe Thornber int r; 1556eec40579SJoe Thornber struct era *era = ti->private; 1557eec40579SJoe Thornber 1558eec40579SJoe Thornber r = in_worker0(era, metadata_era_archive); 1559eec40579SJoe Thornber if (r) { 1560eec40579SJoe Thornber DMERR("%s: couldn't archive current era", __func__); 1561eec40579SJoe Thornber /* FIXME: fail mode */ 1562eec40579SJoe Thornber } 1563eec40579SJoe Thornber 1564eec40579SJoe Thornber stop_worker(era); 1565eec40579SJoe Thornber } 1566eec40579SJoe Thornber 1567eec40579SJoe Thornber static int era_preresume(struct dm_target *ti) 1568eec40579SJoe Thornber { 1569eec40579SJoe Thornber int r; 1570eec40579SJoe Thornber struct era *era = ti->private; 1571eec40579SJoe Thornber dm_block_t new_size = calc_nr_blocks(era); 1572eec40579SJoe Thornber 1573eec40579SJoe Thornber if (era->nr_blocks != new_size) { 1574eec40579SJoe Thornber r = in_worker1(era, metadata_resize, &new_size); 1575eec40579SJoe Thornber if (r) 1576eec40579SJoe Thornber return r; 1577eec40579SJoe Thornber 1578eec40579SJoe Thornber era->nr_blocks = new_size; 1579eec40579SJoe Thornber } 1580eec40579SJoe Thornber 1581eec40579SJoe Thornber start_worker(era); 1582eec40579SJoe Thornber 1583eec40579SJoe Thornber r = in_worker0(era, metadata_new_era); 1584eec40579SJoe Thornber if (r) { 1585eec40579SJoe Thornber DMERR("%s: metadata_era_rollover failed", __func__); 1586eec40579SJoe Thornber return r; 1587eec40579SJoe Thornber } 1588eec40579SJoe Thornber 1589eec40579SJoe Thornber return 0; 1590eec40579SJoe Thornber } 1591eec40579SJoe Thornber 1592eec40579SJoe Thornber /* 1593eec40579SJoe Thornber * Status format: 1594eec40579SJoe Thornber * 1595eec40579SJoe Thornber * <metadata block size> <#used metadata blocks>/<#total metadata blocks> 1596eec40579SJoe Thornber * <current era> <held metadata root | '-'> 1597eec40579SJoe Thornber */ 1598eec40579SJoe Thornber static void era_status(struct dm_target *ti, status_type_t type, 1599eec40579SJoe Thornber unsigned status_flags, char *result, unsigned maxlen) 1600eec40579SJoe Thornber { 1601eec40579SJoe Thornber int r; 1602eec40579SJoe Thornber struct era *era = ti->private; 1603eec40579SJoe Thornber ssize_t sz = 0; 1604eec40579SJoe Thornber struct metadata_stats stats; 1605eec40579SJoe Thornber char buf[BDEVNAME_SIZE]; 1606eec40579SJoe Thornber 1607eec40579SJoe Thornber switch (type) { 1608eec40579SJoe Thornber case STATUSTYPE_INFO: 1609eec40579SJoe Thornber r = in_worker1(era, metadata_get_stats, &stats); 1610eec40579SJoe Thornber if (r) 1611eec40579SJoe Thornber goto err; 1612eec40579SJoe Thornber 1613eec40579SJoe Thornber DMEMIT("%u %llu/%llu %u", 1614eec40579SJoe Thornber (unsigned) (DM_ERA_METADATA_BLOCK_SIZE >> SECTOR_SHIFT), 1615eec40579SJoe Thornber (unsigned long long) stats.used, 1616eec40579SJoe Thornber (unsigned long long) stats.total, 1617eec40579SJoe Thornber (unsigned) stats.era); 1618eec40579SJoe Thornber 1619eec40579SJoe Thornber if (stats.snap != SUPERBLOCK_LOCATION) 1620eec40579SJoe Thornber DMEMIT(" %llu", stats.snap); 1621eec40579SJoe Thornber else 1622eec40579SJoe Thornber DMEMIT(" -"); 1623eec40579SJoe Thornber break; 1624eec40579SJoe Thornber 1625eec40579SJoe Thornber case STATUSTYPE_TABLE: 1626eec40579SJoe Thornber format_dev_t(buf, era->metadata_dev->bdev->bd_dev); 1627eec40579SJoe Thornber DMEMIT("%s ", buf); 1628eec40579SJoe Thornber format_dev_t(buf, era->origin_dev->bdev->bd_dev); 1629eec40579SJoe Thornber DMEMIT("%s %u", buf, era->sectors_per_block); 1630eec40579SJoe Thornber break; 1631eec40579SJoe Thornber } 1632eec40579SJoe Thornber 1633eec40579SJoe Thornber return; 1634eec40579SJoe Thornber 1635eec40579SJoe Thornber err: 1636eec40579SJoe Thornber DMEMIT("Error"); 1637eec40579SJoe Thornber } 1638eec40579SJoe Thornber 1639eec40579SJoe Thornber static int era_message(struct dm_target *ti, unsigned argc, char **argv) 1640eec40579SJoe Thornber { 1641eec40579SJoe Thornber struct era *era = ti->private; 1642eec40579SJoe Thornber 1643eec40579SJoe Thornber if (argc != 1) { 1644eec40579SJoe Thornber DMERR("incorrect number of message arguments"); 1645eec40579SJoe Thornber return -EINVAL; 1646eec40579SJoe Thornber } 1647eec40579SJoe Thornber 1648eec40579SJoe Thornber if (!strcasecmp(argv[0], "checkpoint")) 1649eec40579SJoe Thornber return in_worker0(era, metadata_checkpoint); 1650eec40579SJoe Thornber 1651eec40579SJoe Thornber if (!strcasecmp(argv[0], "take_metadata_snap")) 1652eec40579SJoe Thornber return in_worker0(era, metadata_take_snap); 1653eec40579SJoe Thornber 1654eec40579SJoe Thornber if (!strcasecmp(argv[0], "drop_metadata_snap")) 1655eec40579SJoe Thornber return in_worker0(era, metadata_drop_snap); 1656eec40579SJoe Thornber 1657eec40579SJoe Thornber DMERR("unsupported message '%s'", argv[0]); 1658eec40579SJoe Thornber return -EINVAL; 1659eec40579SJoe Thornber } 1660eec40579SJoe Thornber 1661eec40579SJoe Thornber static sector_t get_dev_size(struct dm_dev *dev) 1662eec40579SJoe Thornber { 1663eec40579SJoe Thornber return i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT; 1664eec40579SJoe Thornber } 1665eec40579SJoe Thornber 1666eec40579SJoe Thornber static int era_iterate_devices(struct dm_target *ti, 1667eec40579SJoe Thornber iterate_devices_callout_fn fn, void *data) 1668eec40579SJoe Thornber { 1669eec40579SJoe Thornber struct era *era = ti->private; 1670eec40579SJoe Thornber return fn(ti, era->origin_dev, 0, get_dev_size(era->origin_dev), data); 1671eec40579SJoe Thornber } 1672eec40579SJoe Thornber 1673eec40579SJoe Thornber static void era_io_hints(struct dm_target *ti, struct queue_limits *limits) 1674eec40579SJoe Thornber { 1675eec40579SJoe Thornber struct era *era = ti->private; 1676eec40579SJoe Thornber uint64_t io_opt_sectors = limits->io_opt >> SECTOR_SHIFT; 1677eec40579SJoe Thornber 1678eec40579SJoe Thornber /* 1679eec40579SJoe Thornber * If the system-determined stacked limits are compatible with the 1680eec40579SJoe Thornber * era device's blocksize (io_opt is a factor) do not override them. 1681eec40579SJoe Thornber */ 1682eec40579SJoe Thornber if (io_opt_sectors < era->sectors_per_block || 1683eec40579SJoe Thornber do_div(io_opt_sectors, era->sectors_per_block)) { 1684eec40579SJoe Thornber blk_limits_io_min(limits, 0); 1685eec40579SJoe Thornber blk_limits_io_opt(limits, era->sectors_per_block << SECTOR_SHIFT); 1686eec40579SJoe Thornber } 1687eec40579SJoe Thornber } 1688eec40579SJoe Thornber 1689eec40579SJoe Thornber /*----------------------------------------------------------------*/ 1690eec40579SJoe Thornber 1691eec40579SJoe Thornber static struct target_type era_target = { 1692eec40579SJoe Thornber .name = "era", 1693eec40579SJoe Thornber .version = {1, 0, 0}, 1694eec40579SJoe Thornber .module = THIS_MODULE, 1695eec40579SJoe Thornber .ctr = era_ctr, 1696eec40579SJoe Thornber .dtr = era_dtr, 1697eec40579SJoe Thornber .map = era_map, 1698eec40579SJoe Thornber .postsuspend = era_postsuspend, 1699eec40579SJoe Thornber .preresume = era_preresume, 1700eec40579SJoe Thornber .status = era_status, 1701eec40579SJoe Thornber .message = era_message, 1702eec40579SJoe Thornber .iterate_devices = era_iterate_devices, 1703eec40579SJoe Thornber .io_hints = era_io_hints 1704eec40579SJoe Thornber }; 1705eec40579SJoe Thornber 1706eec40579SJoe Thornber static int __init dm_era_init(void) 1707eec40579SJoe Thornber { 1708eec40579SJoe Thornber int r; 1709eec40579SJoe Thornber 1710eec40579SJoe Thornber r = dm_register_target(&era_target); 1711eec40579SJoe Thornber if (r) { 1712eec40579SJoe Thornber DMERR("era target registration failed: %d", r); 1713eec40579SJoe Thornber return r; 1714eec40579SJoe Thornber } 1715eec40579SJoe Thornber 1716eec40579SJoe Thornber return 0; 1717eec40579SJoe Thornber } 1718eec40579SJoe Thornber 1719eec40579SJoe Thornber static void __exit dm_era_exit(void) 1720eec40579SJoe Thornber { 1721eec40579SJoe Thornber dm_unregister_target(&era_target); 1722eec40579SJoe Thornber } 1723eec40579SJoe Thornber 1724eec40579SJoe Thornber module_init(dm_era_init); 1725eec40579SJoe Thornber module_exit(dm_era_exit); 1726eec40579SJoe Thornber 1727eec40579SJoe Thornber MODULE_DESCRIPTION(DM_NAME " era target"); 1728eec40579SJoe Thornber MODULE_AUTHOR("Joe Thornber <ejt@redhat.com>"); 1729eec40579SJoe Thornber MODULE_LICENSE("GPL"); 1730