NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010-2011 Neil Brown |
| 3 | * Copyright (C) 2010-2011 Red Hat, Inc. All rights reserved. |
| 4 | * |
| 5 | * This file is released under the GPL. |
| 6 | */ |
| 7 | |
| 8 | #include <linux/slab.h> |
| 9 | |
| 10 | #include "md.h" |
| 11 | #include "raid5.h" |
| 12 | #include "dm.h" |
| 13 | #include "bitmap.h" |
| 14 | |
| 15 | #define DM_MSG_PREFIX "raid" |
| 16 | |
| 17 | /* |
| 18 | * If the MD doesn't support MD_SYNC_STATE_FORCED yet, then |
| 19 | * make it so the flag doesn't set anything. |
| 20 | */ |
| 21 | #ifndef MD_SYNC_STATE_FORCED |
| 22 | #define MD_SYNC_STATE_FORCED 0 |
| 23 | #endif |
| 24 | |
| 25 | struct raid_dev { |
| 26 | /* |
| 27 | * Two DM devices, one to hold metadata and one to hold the |
| 28 | * actual data/parity. The reason for this is to not confuse |
| 29 | * ti->len and give more flexibility in altering size and |
| 30 | * characteristics. |
| 31 | * |
| 32 | * While it is possible for this device to be associated |
| 33 | * with a different physical device than the data_dev, it |
| 34 | * is intended for it to be the same. |
| 35 | * |--------- Physical Device ---------| |
| 36 | * |- meta_dev -|------ data_dev ------| |
| 37 | */ |
| 38 | struct dm_dev *meta_dev; |
| 39 | struct dm_dev *data_dev; |
| 40 | struct mdk_rdev_s rdev; |
| 41 | }; |
| 42 | |
| 43 | /* |
| 44 | * Flags for rs->print_flags field. |
| 45 | */ |
| 46 | #define DMPF_DAEMON_SLEEP 0x1 |
| 47 | #define DMPF_MAX_WRITE_BEHIND 0x2 |
| 48 | #define DMPF_SYNC 0x4 |
| 49 | #define DMPF_NOSYNC 0x8 |
| 50 | #define DMPF_STRIPE_CACHE 0x10 |
| 51 | #define DMPF_MIN_RECOVERY_RATE 0x20 |
| 52 | #define DMPF_MAX_RECOVERY_RATE 0x40 |
| 53 | |
| 54 | struct raid_set { |
| 55 | struct dm_target *ti; |
| 56 | |
| 57 | uint64_t print_flags; |
| 58 | |
| 59 | struct mddev_s md; |
| 60 | struct raid_type *raid_type; |
| 61 | struct dm_target_callbacks callbacks; |
| 62 | |
| 63 | struct raid_dev dev[0]; |
| 64 | }; |
| 65 | |
| 66 | /* Supported raid types and properties. */ |
| 67 | static struct raid_type { |
| 68 | const char *name; /* RAID algorithm. */ |
| 69 | const char *descr; /* Descriptor text for logging. */ |
| 70 | const unsigned parity_devs; /* # of parity devices. */ |
| 71 | const unsigned minimal_devs; /* minimal # of devices in set. */ |
| 72 | const unsigned level; /* RAID level. */ |
| 73 | const unsigned algorithm; /* RAID algorithm. */ |
| 74 | } raid_types[] = { |
| 75 | {"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, |
| 76 | {"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC}, |
| 77 | {"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC}, |
| 78 | {"raid5_ls", "RAID5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, |
| 79 | {"raid5_rs", "RAID5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, |
| 80 | {"raid6_zr", "RAID6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART}, |
| 81 | {"raid6_nr", "RAID6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART}, |
| 82 | {"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE} |
| 83 | }; |
| 84 | |
| 85 | static struct raid_type *get_raid_type(char *name) |
| 86 | { |
| 87 | int i; |
| 88 | |
| 89 | for (i = 0; i < ARRAY_SIZE(raid_types); i++) |
| 90 | if (!strcmp(raid_types[i].name, name)) |
| 91 | return &raid_types[i]; |
| 92 | |
| 93 | return NULL; |
| 94 | } |
| 95 | |
| 96 | static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs) |
| 97 | { |
| 98 | unsigned i; |
| 99 | struct raid_set *rs; |
| 100 | sector_t sectors_per_dev; |
| 101 | |
| 102 | if (raid_devs <= raid_type->parity_devs) { |
| 103 | ti->error = "Insufficient number of devices"; |
| 104 | return ERR_PTR(-EINVAL); |
| 105 | } |
| 106 | |
| 107 | sectors_per_dev = ti->len; |
| 108 | if (sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) { |
| 109 | ti->error = "Target length not divisible by number of data devices"; |
| 110 | return ERR_PTR(-EINVAL); |
| 111 | } |
| 112 | |
| 113 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); |
| 114 | if (!rs) { |
| 115 | ti->error = "Cannot allocate raid context"; |
| 116 | return ERR_PTR(-ENOMEM); |
| 117 | } |
| 118 | |
| 119 | mddev_init(&rs->md); |
| 120 | |
| 121 | rs->ti = ti; |
| 122 | rs->raid_type = raid_type; |
| 123 | rs->md.raid_disks = raid_devs; |
| 124 | rs->md.level = raid_type->level; |
| 125 | rs->md.new_level = rs->md.level; |
| 126 | rs->md.dev_sectors = sectors_per_dev; |
| 127 | rs->md.layout = raid_type->algorithm; |
| 128 | rs->md.new_layout = rs->md.layout; |
| 129 | rs->md.delta_disks = 0; |
| 130 | rs->md.recovery_cp = 0; |
| 131 | |
| 132 | for (i = 0; i < raid_devs; i++) |
| 133 | md_rdev_init(&rs->dev[i].rdev); |
| 134 | |
| 135 | /* |
| 136 | * Remaining items to be initialized by further RAID params: |
| 137 | * rs->md.persistent |
| 138 | * rs->md.external |
| 139 | * rs->md.chunk_sectors |
| 140 | * rs->md.new_chunk_sectors |
| 141 | */ |
| 142 | |
| 143 | return rs; |
| 144 | } |
| 145 | |
| 146 | static void context_free(struct raid_set *rs) |
| 147 | { |
| 148 | int i; |
| 149 | |
| 150 | for (i = 0; i < rs->md.raid_disks; i++) |
| 151 | if (rs->dev[i].data_dev) |
| 152 | dm_put_device(rs->ti, rs->dev[i].data_dev); |
| 153 | |
| 154 | kfree(rs); |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * For every device we have two words |
| 159 | * <meta_dev>: meta device name or '-' if missing |
| 160 | * <data_dev>: data device name or '-' if missing |
| 161 | * |
| 162 | * This code parses those words. |
| 163 | */ |
| 164 | static int dev_parms(struct raid_set *rs, char **argv) |
| 165 | { |
| 166 | int i; |
| 167 | int rebuild = 0; |
| 168 | int metadata_available = 0; |
| 169 | int ret = 0; |
| 170 | |
| 171 | for (i = 0; i < rs->md.raid_disks; i++, argv += 2) { |
| 172 | rs->dev[i].rdev.raid_disk = i; |
| 173 | |
| 174 | rs->dev[i].meta_dev = NULL; |
| 175 | rs->dev[i].data_dev = NULL; |
| 176 | |
| 177 | /* |
| 178 | * There are no offsets, since there is a separate device |
| 179 | * for data and metadata. |
| 180 | */ |
| 181 | rs->dev[i].rdev.data_offset = 0; |
| 182 | rs->dev[i].rdev.mddev = &rs->md; |
| 183 | |
| 184 | if (strcmp(argv[0], "-")) { |
| 185 | rs->ti->error = "Metadata devices not supported"; |
| 186 | return -EINVAL; |
| 187 | } |
| 188 | |
| 189 | if (!strcmp(argv[1], "-")) { |
| 190 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && |
| 191 | (!rs->dev[i].rdev.recovery_offset)) { |
| 192 | rs->ti->error = "Drive designated for rebuild not specified"; |
| 193 | return -EINVAL; |
| 194 | } |
| 195 | |
| 196 | continue; |
| 197 | } |
| 198 | |
| 199 | ret = dm_get_device(rs->ti, argv[1], |
| 200 | dm_table_get_mode(rs->ti->table), |
| 201 | &rs->dev[i].data_dev); |
| 202 | if (ret) { |
| 203 | rs->ti->error = "RAID device lookup failure"; |
| 204 | return ret; |
| 205 | } |
| 206 | |
| 207 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
| 208 | list_add(&rs->dev[i].rdev.same_set, &rs->md.disks); |
| 209 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 210 | rebuild++; |
| 211 | } |
| 212 | |
| 213 | if (metadata_available) { |
| 214 | rs->md.external = 0; |
| 215 | rs->md.persistent = 1; |
| 216 | rs->md.major_version = 2; |
| 217 | } else if (rebuild && !rs->md.recovery_cp) { |
| 218 | /* |
| 219 | * Without metadata, we will not be able to tell if the array |
| 220 | * is in-sync or not - we must assume it is not. Therefore, |
| 221 | * it is impossible to rebuild a drive. |
| 222 | * |
| 223 | * Even if there is metadata, the on-disk information may |
| 224 | * indicate that the array is not in-sync and it will then |
| 225 | * fail at that time. |
| 226 | * |
| 227 | * User could specify 'nosync' option if desperate. |
| 228 | */ |
| 229 | DMERR("Unable to rebuild drive while array is not in-sync"); |
| 230 | rs->ti->error = "RAID device lookup failure"; |
| 231 | return -EINVAL; |
| 232 | } |
| 233 | |
| 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * Possible arguments are... |
| 239 | * RAID456: |
| 240 | * <chunk_size> [optional_args] |
| 241 | * |
| 242 | * Optional args: |
| 243 | * [[no]sync] Force or prevent recovery of the entire array |
| 244 | * [rebuild <idx>] Rebuild the drive indicated by the index |
| 245 | * [daemon_sleep <ms>] Time between bitmap daemon work to clear bits |
| 246 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
| 247 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
| 248 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
| 249 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs |
| 250 | */ |
| 251 | static int parse_raid_params(struct raid_set *rs, char **argv, |
| 252 | unsigned num_raid_params) |
| 253 | { |
| 254 | unsigned i, rebuild_cnt = 0; |
| 255 | unsigned long value; |
| 256 | char *key; |
| 257 | |
| 258 | /* |
| 259 | * First, parse the in-order required arguments |
| 260 | */ |
| 261 | if ((strict_strtoul(argv[0], 10, &value) < 0) || |
| 262 | !is_power_of_2(value) || (value < 8)) { |
| 263 | rs->ti->error = "Bad chunk size"; |
| 264 | return -EINVAL; |
| 265 | } |
| 266 | |
| 267 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; |
| 268 | argv++; |
| 269 | num_raid_params--; |
| 270 | |
| 271 | /* |
| 272 | * Second, parse the unordered optional arguments |
| 273 | */ |
| 274 | for (i = 0; i < rs->md.raid_disks; i++) |
| 275 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
| 276 | |
| 277 | for (i = 0; i < num_raid_params; i++) { |
| 278 | if (!strcmp(argv[i], "nosync")) { |
| 279 | rs->md.recovery_cp = MaxSector; |
| 280 | rs->print_flags |= DMPF_NOSYNC; |
| 281 | rs->md.flags |= MD_SYNC_STATE_FORCED; |
| 282 | continue; |
| 283 | } |
| 284 | if (!strcmp(argv[i], "sync")) { |
| 285 | rs->md.recovery_cp = 0; |
| 286 | rs->print_flags |= DMPF_SYNC; |
| 287 | rs->md.flags |= MD_SYNC_STATE_FORCED; |
| 288 | continue; |
| 289 | } |
| 290 | |
| 291 | /* The rest of the optional arguments come in key/value pairs */ |
| 292 | if ((i + 1) >= num_raid_params) { |
| 293 | rs->ti->error = "Wrong number of raid parameters given"; |
| 294 | return -EINVAL; |
| 295 | } |
| 296 | |
| 297 | key = argv[i++]; |
| 298 | if (strict_strtoul(argv[i], 10, &value) < 0) { |
| 299 | rs->ti->error = "Bad numerical argument given in raid params"; |
| 300 | return -EINVAL; |
| 301 | } |
| 302 | |
| 303 | if (!strcmp(key, "rebuild")) { |
| 304 | if (++rebuild_cnt > rs->raid_type->parity_devs) { |
| 305 | rs->ti->error = "Too many rebuild drives given"; |
| 306 | return -EINVAL; |
| 307 | } |
| 308 | if (value > rs->md.raid_disks) { |
| 309 | rs->ti->error = "Invalid rebuild index given"; |
| 310 | return -EINVAL; |
| 311 | } |
| 312 | clear_bit(In_sync, &rs->dev[value].rdev.flags); |
| 313 | rs->dev[value].rdev.recovery_offset = 0; |
| 314 | } else if (!strcmp(key, "max_write_behind")) { |
| 315 | rs->print_flags |= DMPF_MAX_WRITE_BEHIND; |
| 316 | |
| 317 | /* |
| 318 | * In device-mapper, we specify things in sectors, but |
| 319 | * MD records this value in kB |
| 320 | */ |
| 321 | value /= 2; |
| 322 | if (value > COUNTER_MAX) { |
| 323 | rs->ti->error = "Max write-behind limit out of range"; |
| 324 | return -EINVAL; |
| 325 | } |
| 326 | rs->md.bitmap_info.max_write_behind = value; |
| 327 | } else if (!strcmp(key, "daemon_sleep")) { |
| 328 | rs->print_flags |= DMPF_DAEMON_SLEEP; |
| 329 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) { |
| 330 | rs->ti->error = "daemon sleep period out of range"; |
| 331 | return -EINVAL; |
| 332 | } |
| 333 | rs->md.bitmap_info.daemon_sleep = value; |
| 334 | } else if (!strcmp(key, "stripe_cache")) { |
| 335 | rs->print_flags |= DMPF_STRIPE_CACHE; |
| 336 | |
| 337 | /* |
| 338 | * In device-mapper, we specify things in sectors, but |
| 339 | * MD records this value in kB |
| 340 | */ |
| 341 | value /= 2; |
| 342 | |
| 343 | if (rs->raid_type->level < 5) { |
| 344 | rs->ti->error = "Inappropriate argument: stripe_cache"; |
| 345 | return -EINVAL; |
| 346 | } |
| 347 | if (raid5_set_cache_size(&rs->md, (int)value)) { |
| 348 | rs->ti->error = "Bad stripe_cache size"; |
| 349 | return -EINVAL; |
| 350 | } |
| 351 | } else if (!strcmp(key, "min_recovery_rate")) { |
| 352 | rs->print_flags |= DMPF_MIN_RECOVERY_RATE; |
| 353 | if (value > INT_MAX) { |
| 354 | rs->ti->error = "min_recovery_rate out of range"; |
| 355 | return -EINVAL; |
| 356 | } |
| 357 | rs->md.sync_speed_min = (int)value; |
| 358 | } else if (!strcmp(key, "max_recovery_rate")) { |
| 359 | rs->print_flags |= DMPF_MAX_RECOVERY_RATE; |
| 360 | if (value > INT_MAX) { |
| 361 | rs->ti->error = "max_recovery_rate out of range"; |
| 362 | return -EINVAL; |
| 363 | } |
| 364 | rs->md.sync_speed_max = (int)value; |
| 365 | } else { |
| 366 | DMERR("Unable to parse RAID parameter: %s", key); |
| 367 | rs->ti->error = "Unable to parse RAID parameters"; |
| 368 | return -EINVAL; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | /* Assume there are no metadata devices until the drives are parsed */ |
| 373 | rs->md.persistent = 0; |
| 374 | rs->md.external = 1; |
| 375 | |
| 376 | return 0; |
| 377 | } |
| 378 | |
| 379 | static void do_table_event(struct work_struct *ws) |
| 380 | { |
| 381 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); |
| 382 | |
| 383 | dm_table_event(rs->ti->table); |
| 384 | } |
| 385 | |
| 386 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) |
| 387 | { |
| 388 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); |
| 389 | |
| 390 | return md_raid5_congested(&rs->md, bits); |
| 391 | } |
| 392 | |
| 393 | static void raid_unplug(struct dm_target_callbacks *cb) |
| 394 | { |
| 395 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); |
| 396 | |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 397 | md_raid5_kick_device(rs->md.private); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Construct a RAID4/5/6 mapping: |
| 402 | * Args: |
| 403 | * <raid_type> <#raid_params> <raid_params> \ |
| 404 | * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> } |
| 405 | * |
| 406 | * ** metadata devices are not supported yet, use '-' instead ** |
| 407 | * |
| 408 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
| 409 | * details on possible <raid_params>. |
| 410 | */ |
| 411 | static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) |
| 412 | { |
| 413 | int ret; |
| 414 | struct raid_type *rt; |
| 415 | unsigned long num_raid_params, num_raid_devs; |
| 416 | struct raid_set *rs = NULL; |
| 417 | |
| 418 | /* Must have at least <raid_type> <#raid_params> */ |
| 419 | if (argc < 2) { |
| 420 | ti->error = "Too few arguments"; |
| 421 | return -EINVAL; |
| 422 | } |
| 423 | |
| 424 | /* raid type */ |
| 425 | rt = get_raid_type(argv[0]); |
| 426 | if (!rt) { |
| 427 | ti->error = "Unrecognised raid_type"; |
| 428 | return -EINVAL; |
| 429 | } |
| 430 | argc--; |
| 431 | argv++; |
| 432 | |
| 433 | /* number of RAID parameters */ |
| 434 | if (strict_strtoul(argv[0], 10, &num_raid_params) < 0) { |
| 435 | ti->error = "Cannot understand number of RAID parameters"; |
| 436 | return -EINVAL; |
| 437 | } |
| 438 | argc--; |
| 439 | argv++; |
| 440 | |
| 441 | /* Skip over RAID params for now and find out # of devices */ |
| 442 | if (num_raid_params + 1 > argc) { |
| 443 | ti->error = "Arguments do not agree with counts given"; |
| 444 | return -EINVAL; |
| 445 | } |
| 446 | |
| 447 | if ((strict_strtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || |
| 448 | (num_raid_devs >= INT_MAX)) { |
| 449 | ti->error = "Cannot understand number of raid devices"; |
| 450 | return -EINVAL; |
| 451 | } |
| 452 | |
| 453 | rs = context_alloc(ti, rt, (unsigned)num_raid_devs); |
| 454 | if (IS_ERR(rs)) |
| 455 | return PTR_ERR(rs); |
| 456 | |
| 457 | ret = parse_raid_params(rs, argv, (unsigned)num_raid_params); |
| 458 | if (ret) |
| 459 | goto bad; |
| 460 | |
| 461 | ret = -EINVAL; |
| 462 | |
| 463 | argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */ |
| 464 | argv += num_raid_params + 1; |
| 465 | |
| 466 | if (argc != (num_raid_devs * 2)) { |
| 467 | ti->error = "Supplied RAID devices does not match the count given"; |
| 468 | goto bad; |
| 469 | } |
| 470 | |
| 471 | ret = dev_parms(rs, argv); |
| 472 | if (ret) |
| 473 | goto bad; |
| 474 | |
| 475 | INIT_WORK(&rs->md.event_work, do_table_event); |
| 476 | ti->split_io = rs->md.chunk_sectors; |
| 477 | ti->private = rs; |
| 478 | |
| 479 | mutex_lock(&rs->md.reconfig_mutex); |
| 480 | ret = md_run(&rs->md); |
| 481 | rs->md.in_sync = 0; /* Assume already marked dirty */ |
| 482 | mutex_unlock(&rs->md.reconfig_mutex); |
| 483 | |
| 484 | if (ret) { |
| 485 | ti->error = "Fail to run raid array"; |
| 486 | goto bad; |
| 487 | } |
| 488 | |
| 489 | rs->callbacks.congested_fn = raid_is_congested; |
| 490 | rs->callbacks.unplug_fn = raid_unplug; |
| 491 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
| 492 | |
| 493 | return 0; |
| 494 | |
| 495 | bad: |
| 496 | context_free(rs); |
| 497 | |
| 498 | return ret; |
| 499 | } |
| 500 | |
| 501 | static void raid_dtr(struct dm_target *ti) |
| 502 | { |
| 503 | struct raid_set *rs = ti->private; |
| 504 | |
| 505 | list_del_init(&rs->callbacks.list); |
| 506 | md_stop(&rs->md); |
| 507 | context_free(rs); |
| 508 | } |
| 509 | |
| 510 | static int raid_map(struct dm_target *ti, struct bio *bio, union map_info *map_context) |
| 511 | { |
| 512 | struct raid_set *rs = ti->private; |
| 513 | mddev_t *mddev = &rs->md; |
| 514 | |
| 515 | mddev->pers->make_request(mddev, bio); |
| 516 | |
| 517 | return DM_MAPIO_SUBMITTED; |
| 518 | } |
| 519 | |
| 520 | static int raid_status(struct dm_target *ti, status_type_t type, |
| 521 | char *result, unsigned maxlen) |
| 522 | { |
| 523 | struct raid_set *rs = ti->private; |
| 524 | unsigned raid_param_cnt = 1; /* at least 1 for chunksize */ |
| 525 | unsigned sz = 0; |
| 526 | int i; |
| 527 | sector_t sync; |
| 528 | |
| 529 | switch (type) { |
| 530 | case STATUSTYPE_INFO: |
| 531 | DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks); |
| 532 | |
| 533 | for (i = 0; i < rs->md.raid_disks; i++) { |
| 534 | if (test_bit(Faulty, &rs->dev[i].rdev.flags)) |
| 535 | DMEMIT("D"); |
| 536 | else if (test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 537 | DMEMIT("A"); |
| 538 | else |
| 539 | DMEMIT("a"); |
| 540 | } |
| 541 | |
| 542 | if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery)) |
| 543 | sync = rs->md.curr_resync_completed; |
| 544 | else |
| 545 | sync = rs->md.recovery_cp; |
| 546 | |
| 547 | if (sync > rs->md.resync_max_sectors) |
| 548 | sync = rs->md.resync_max_sectors; |
| 549 | |
| 550 | DMEMIT(" %llu/%llu", |
| 551 | (unsigned long long) sync, |
| 552 | (unsigned long long) rs->md.resync_max_sectors); |
| 553 | |
| 554 | break; |
| 555 | case STATUSTYPE_TABLE: |
| 556 | /* The string you would use to construct this array */ |
| 557 | for (i = 0; i < rs->md.raid_disks; i++) |
| 558 | if (rs->dev[i].data_dev && |
| 559 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 560 | raid_param_cnt++; /* for rebuilds */ |
| 561 | |
| 562 | raid_param_cnt += (hweight64(rs->print_flags) * 2); |
| 563 | if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)) |
| 564 | raid_param_cnt--; |
| 565 | |
| 566 | DMEMIT("%s %u %u", rs->raid_type->name, |
| 567 | raid_param_cnt, rs->md.chunk_sectors); |
| 568 | |
| 569 | if ((rs->print_flags & DMPF_SYNC) && |
| 570 | (rs->md.recovery_cp == MaxSector)) |
| 571 | DMEMIT(" sync"); |
| 572 | if (rs->print_flags & DMPF_NOSYNC) |
| 573 | DMEMIT(" nosync"); |
| 574 | |
| 575 | for (i = 0; i < rs->md.raid_disks; i++) |
| 576 | if (rs->dev[i].data_dev && |
| 577 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 578 | DMEMIT(" rebuild %u", i); |
| 579 | |
| 580 | if (rs->print_flags & DMPF_DAEMON_SLEEP) |
| 581 | DMEMIT(" daemon_sleep %lu", |
| 582 | rs->md.bitmap_info.daemon_sleep); |
| 583 | |
| 584 | if (rs->print_flags & DMPF_MIN_RECOVERY_RATE) |
| 585 | DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min); |
| 586 | |
| 587 | if (rs->print_flags & DMPF_MAX_RECOVERY_RATE) |
| 588 | DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max); |
| 589 | |
| 590 | if (rs->print_flags & DMPF_MAX_WRITE_BEHIND) |
| 591 | DMEMIT(" max_write_behind %lu", |
| 592 | rs->md.bitmap_info.max_write_behind); |
| 593 | |
| 594 | if (rs->print_flags & DMPF_STRIPE_CACHE) { |
| 595 | raid5_conf_t *conf = rs->md.private; |
| 596 | |
| 597 | /* convert from kiB to sectors */ |
| 598 | DMEMIT(" stripe_cache %d", |
| 599 | conf ? conf->max_nr_stripes * 2 : 0); |
| 600 | } |
| 601 | |
| 602 | DMEMIT(" %d", rs->md.raid_disks); |
| 603 | for (i = 0; i < rs->md.raid_disks; i++) { |
| 604 | DMEMIT(" -"); /* metadata device */ |
| 605 | |
| 606 | if (rs->dev[i].data_dev) |
| 607 | DMEMIT(" %s", rs->dev[i].data_dev->name); |
| 608 | else |
| 609 | DMEMIT(" -"); |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static int raid_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) |
| 617 | { |
| 618 | struct raid_set *rs = ti->private; |
| 619 | unsigned i; |
| 620 | int ret = 0; |
| 621 | |
| 622 | for (i = 0; !ret && i < rs->md.raid_disks; i++) |
| 623 | if (rs->dev[i].data_dev) |
| 624 | ret = fn(ti, |
| 625 | rs->dev[i].data_dev, |
| 626 | 0, /* No offset on data devs */ |
| 627 | rs->md.dev_sectors, |
| 628 | data); |
| 629 | |
| 630 | return ret; |
| 631 | } |
| 632 | |
| 633 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) |
| 634 | { |
| 635 | struct raid_set *rs = ti->private; |
| 636 | unsigned chunk_size = rs->md.chunk_sectors << 9; |
| 637 | raid5_conf_t *conf = rs->md.private; |
| 638 | |
| 639 | blk_limits_io_min(limits, chunk_size); |
| 640 | blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); |
| 641 | } |
| 642 | |
| 643 | static void raid_presuspend(struct dm_target *ti) |
| 644 | { |
| 645 | struct raid_set *rs = ti->private; |
| 646 | |
| 647 | md_stop_writes(&rs->md); |
| 648 | } |
| 649 | |
| 650 | static void raid_postsuspend(struct dm_target *ti) |
| 651 | { |
| 652 | struct raid_set *rs = ti->private; |
| 653 | |
| 654 | mddev_suspend(&rs->md); |
| 655 | } |
| 656 | |
| 657 | static void raid_resume(struct dm_target *ti) |
| 658 | { |
| 659 | struct raid_set *rs = ti->private; |
| 660 | |
| 661 | mddev_resume(&rs->md); |
| 662 | } |
| 663 | |
| 664 | static struct target_type raid_target = { |
| 665 | .name = "raid", |
| 666 | .version = {1, 0, 0}, |
| 667 | .module = THIS_MODULE, |
| 668 | .ctr = raid_ctr, |
| 669 | .dtr = raid_dtr, |
| 670 | .map = raid_map, |
| 671 | .status = raid_status, |
| 672 | .iterate_devices = raid_iterate_devices, |
| 673 | .io_hints = raid_io_hints, |
| 674 | .presuspend = raid_presuspend, |
| 675 | .postsuspend = raid_postsuspend, |
| 676 | .resume = raid_resume, |
| 677 | }; |
| 678 | |
| 679 | static int __init dm_raid_init(void) |
| 680 | { |
| 681 | return dm_register_target(&raid_target); |
| 682 | } |
| 683 | |
| 684 | static void __exit dm_raid_exit(void) |
| 685 | { |
| 686 | dm_unregister_target(&raid_target); |
| 687 | } |
| 688 | |
| 689 | module_init(dm_raid_init); |
| 690 | module_exit(dm_raid_exit); |
| 691 | |
| 692 | MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); |
| 693 | MODULE_ALIAS("dm-raid4"); |
| 694 | MODULE_ALIAS("dm-raid5"); |
| 695 | MODULE_ALIAS("dm-raid6"); |
| 696 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); |
| 697 | MODULE_LICENSE("GPL"); |