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> |
Paul Gortmaker | 056075c | 2011-07-03 13:58:33 -0400 | [diff] [blame] | 9 | #include <linux/module.h> |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 10 | |
| 11 | #include "md.h" |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 12 | #include "raid1.h" |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 13 | #include "raid5.h" |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 14 | #include "raid10.h" |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 15 | #include "bitmap.h" |
| 16 | |
Alasdair G Kergon | 3e8dbb7 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 17 | #include <linux/device-mapper.h> |
| 18 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 19 | #define DM_MSG_PREFIX "raid" |
| 20 | |
| 21 | /* |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 22 | * The following flags are used by dm-raid.c to set up the array state. |
| 23 | * They must be cleared before md_run is called. |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 24 | */ |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 25 | #define FirstUse 10 /* rdev flag */ |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 26 | |
| 27 | struct raid_dev { |
| 28 | /* |
| 29 | * Two DM devices, one to hold metadata and one to hold the |
| 30 | * actual data/parity. The reason for this is to not confuse |
| 31 | * ti->len and give more flexibility in altering size and |
| 32 | * characteristics. |
| 33 | * |
| 34 | * While it is possible for this device to be associated |
| 35 | * with a different physical device than the data_dev, it |
| 36 | * is intended for it to be the same. |
| 37 | * |--------- Physical Device ---------| |
| 38 | * |- meta_dev -|------ data_dev ------| |
| 39 | */ |
| 40 | struct dm_dev *meta_dev; |
| 41 | struct dm_dev *data_dev; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 42 | struct md_rdev rdev; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 43 | }; |
| 44 | |
| 45 | /* |
| 46 | * Flags for rs->print_flags field. |
| 47 | */ |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 48 | #define DMPF_SYNC 0x1 |
| 49 | #define DMPF_NOSYNC 0x2 |
| 50 | #define DMPF_REBUILD 0x4 |
| 51 | #define DMPF_DAEMON_SLEEP 0x8 |
| 52 | #define DMPF_MIN_RECOVERY_RATE 0x10 |
| 53 | #define DMPF_MAX_RECOVERY_RATE 0x20 |
| 54 | #define DMPF_MAX_WRITE_BEHIND 0x40 |
| 55 | #define DMPF_STRIPE_CACHE 0x80 |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 56 | #define DMPF_REGION_SIZE 0x100 |
| 57 | #define DMPF_RAID10_COPIES 0x200 |
| 58 | #define DMPF_RAID10_FORMAT 0x400 |
| 59 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 60 | struct raid_set { |
| 61 | struct dm_target *ti; |
| 62 | |
Jonathan Brassow | 34f8ac6d | 2012-01-27 14:53:53 -0600 | [diff] [blame] | 63 | uint32_t bitmap_loaded; |
| 64 | uint32_t print_flags; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 65 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 66 | struct mddev md; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 67 | struct raid_type *raid_type; |
| 68 | struct dm_target_callbacks callbacks; |
| 69 | |
| 70 | struct raid_dev dev[0]; |
| 71 | }; |
| 72 | |
| 73 | /* Supported raid types and properties. */ |
| 74 | static struct raid_type { |
| 75 | const char *name; /* RAID algorithm. */ |
| 76 | const char *descr; /* Descriptor text for logging. */ |
| 77 | const unsigned parity_devs; /* # of parity devices. */ |
| 78 | const unsigned minimal_devs; /* minimal # of devices in set. */ |
| 79 | const unsigned level; /* RAID level. */ |
| 80 | const unsigned algorithm; /* RAID algorithm. */ |
| 81 | } raid_types[] = { |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 82 | {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */}, |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 83 | {"raid10", "RAID10 (striped mirrors)", 0, 2, 10, UINT_MAX /* Varies */}, |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 84 | {"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, |
| 85 | {"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC}, |
| 86 | {"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC}, |
| 87 | {"raid5_ls", "RAID5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, |
| 88 | {"raid5_rs", "RAID5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, |
| 89 | {"raid6_zr", "RAID6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART}, |
| 90 | {"raid6_nr", "RAID6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART}, |
| 91 | {"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE} |
| 92 | }; |
| 93 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 94 | static unsigned raid10_md_layout_to_copies(int layout) |
| 95 | { |
| 96 | return layout & 0xFF; |
| 97 | } |
| 98 | |
| 99 | static int raid10_format_to_md_layout(char *format, unsigned copies) |
| 100 | { |
| 101 | /* 1 "far" copy, and 'copies' "near" copies */ |
| 102 | return (1 << 8) | (copies & 0xFF); |
| 103 | } |
| 104 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 105 | static struct raid_type *get_raid_type(char *name) |
| 106 | { |
| 107 | int i; |
| 108 | |
| 109 | for (i = 0; i < ARRAY_SIZE(raid_types); i++) |
| 110 | if (!strcmp(raid_types[i].name, name)) |
| 111 | return &raid_types[i]; |
| 112 | |
| 113 | return NULL; |
| 114 | } |
| 115 | |
| 116 | static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs) |
| 117 | { |
| 118 | unsigned i; |
| 119 | struct raid_set *rs; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 120 | |
| 121 | if (raid_devs <= raid_type->parity_devs) { |
| 122 | ti->error = "Insufficient number of devices"; |
| 123 | return ERR_PTR(-EINVAL); |
| 124 | } |
| 125 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 126 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); |
| 127 | if (!rs) { |
| 128 | ti->error = "Cannot allocate raid context"; |
| 129 | return ERR_PTR(-ENOMEM); |
| 130 | } |
| 131 | |
| 132 | mddev_init(&rs->md); |
| 133 | |
| 134 | rs->ti = ti; |
| 135 | rs->raid_type = raid_type; |
| 136 | rs->md.raid_disks = raid_devs; |
| 137 | rs->md.level = raid_type->level; |
| 138 | rs->md.new_level = rs->md.level; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 139 | rs->md.layout = raid_type->algorithm; |
| 140 | rs->md.new_layout = rs->md.layout; |
| 141 | rs->md.delta_disks = 0; |
| 142 | rs->md.recovery_cp = 0; |
| 143 | |
| 144 | for (i = 0; i < raid_devs; i++) |
| 145 | md_rdev_init(&rs->dev[i].rdev); |
| 146 | |
| 147 | /* |
| 148 | * Remaining items to be initialized by further RAID params: |
| 149 | * rs->md.persistent |
| 150 | * rs->md.external |
| 151 | * rs->md.chunk_sectors |
| 152 | * rs->md.new_chunk_sectors |
Jonathan E Brassow | c039c33 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 153 | * rs->md.dev_sectors |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 154 | */ |
| 155 | |
| 156 | return rs; |
| 157 | } |
| 158 | |
| 159 | static void context_free(struct raid_set *rs) |
| 160 | { |
| 161 | int i; |
| 162 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 163 | for (i = 0; i < rs->md.raid_disks; i++) { |
| 164 | if (rs->dev[i].meta_dev) |
| 165 | dm_put_device(rs->ti, rs->dev[i].meta_dev); |
NeilBrown | 545c879 | 2012-05-22 13:54:30 +1000 | [diff] [blame] | 166 | md_rdev_clear(&rs->dev[i].rdev); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 167 | if (rs->dev[i].data_dev) |
| 168 | dm_put_device(rs->ti, rs->dev[i].data_dev); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 169 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 170 | |
| 171 | kfree(rs); |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * For every device we have two words |
| 176 | * <meta_dev>: meta device name or '-' if missing |
| 177 | * <data_dev>: data device name or '-' if missing |
| 178 | * |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 179 | * The following are permitted: |
| 180 | * - - |
| 181 | * - <data_dev> |
| 182 | * <meta_dev> <data_dev> |
| 183 | * |
| 184 | * The following is not allowed: |
| 185 | * <meta_dev> - |
| 186 | * |
| 187 | * This code parses those words. If there is a failure, |
| 188 | * the caller must use context_free to unwind the operations. |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 189 | */ |
| 190 | static int dev_parms(struct raid_set *rs, char **argv) |
| 191 | { |
| 192 | int i; |
| 193 | int rebuild = 0; |
| 194 | int metadata_available = 0; |
| 195 | int ret = 0; |
| 196 | |
| 197 | for (i = 0; i < rs->md.raid_disks; i++, argv += 2) { |
| 198 | rs->dev[i].rdev.raid_disk = i; |
| 199 | |
| 200 | rs->dev[i].meta_dev = NULL; |
| 201 | rs->dev[i].data_dev = NULL; |
| 202 | |
| 203 | /* |
| 204 | * There are no offsets, since there is a separate device |
| 205 | * for data and metadata. |
| 206 | */ |
| 207 | rs->dev[i].rdev.data_offset = 0; |
| 208 | rs->dev[i].rdev.mddev = &rs->md; |
| 209 | |
| 210 | if (strcmp(argv[0], "-")) { |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 211 | ret = dm_get_device(rs->ti, argv[0], |
| 212 | dm_table_get_mode(rs->ti->table), |
| 213 | &rs->dev[i].meta_dev); |
| 214 | rs->ti->error = "RAID metadata device lookup failure"; |
| 215 | if (ret) |
| 216 | return ret; |
| 217 | |
| 218 | rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); |
| 219 | if (!rs->dev[i].rdev.sb_page) |
| 220 | return -ENOMEM; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 221 | } |
| 222 | |
| 223 | if (!strcmp(argv[1], "-")) { |
| 224 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && |
| 225 | (!rs->dev[i].rdev.recovery_offset)) { |
| 226 | rs->ti->error = "Drive designated for rebuild not specified"; |
| 227 | return -EINVAL; |
| 228 | } |
| 229 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 230 | rs->ti->error = "No data device supplied with metadata device"; |
| 231 | if (rs->dev[i].meta_dev) |
| 232 | return -EINVAL; |
| 233 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 234 | continue; |
| 235 | } |
| 236 | |
| 237 | ret = dm_get_device(rs->ti, argv[1], |
| 238 | dm_table_get_mode(rs->ti->table), |
| 239 | &rs->dev[i].data_dev); |
| 240 | if (ret) { |
| 241 | rs->ti->error = "RAID device lookup failure"; |
| 242 | return ret; |
| 243 | } |
| 244 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 245 | if (rs->dev[i].meta_dev) { |
| 246 | metadata_available = 1; |
| 247 | rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; |
| 248 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 249 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
| 250 | list_add(&rs->dev[i].rdev.same_set, &rs->md.disks); |
| 251 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 252 | rebuild++; |
| 253 | } |
| 254 | |
| 255 | if (metadata_available) { |
| 256 | rs->md.external = 0; |
| 257 | rs->md.persistent = 1; |
| 258 | rs->md.major_version = 2; |
| 259 | } else if (rebuild && !rs->md.recovery_cp) { |
| 260 | /* |
| 261 | * Without metadata, we will not be able to tell if the array |
| 262 | * is in-sync or not - we must assume it is not. Therefore, |
| 263 | * it is impossible to rebuild a drive. |
| 264 | * |
| 265 | * Even if there is metadata, the on-disk information may |
| 266 | * indicate that the array is not in-sync and it will then |
| 267 | * fail at that time. |
| 268 | * |
| 269 | * User could specify 'nosync' option if desperate. |
| 270 | */ |
| 271 | DMERR("Unable to rebuild drive while array is not in-sync"); |
| 272 | rs->ti->error = "RAID device lookup failure"; |
| 273 | return -EINVAL; |
| 274 | } |
| 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | /* |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 280 | * validate_region_size |
| 281 | * @rs |
| 282 | * @region_size: region size in sectors. If 0, pick a size (4MiB default). |
| 283 | * |
| 284 | * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). |
| 285 | * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. |
| 286 | * |
| 287 | * Returns: 0 on success, -EINVAL on failure. |
| 288 | */ |
| 289 | static int validate_region_size(struct raid_set *rs, unsigned long region_size) |
| 290 | { |
| 291 | unsigned long min_region_size = rs->ti->len / (1 << 21); |
| 292 | |
| 293 | if (!region_size) { |
| 294 | /* |
| 295 | * Choose a reasonable default. All figures in sectors. |
| 296 | */ |
| 297 | if (min_region_size > (1 << 13)) { |
Jonathan Brassow | 3a0f9aa | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 298 | /* If not a power of 2, make it the next power of 2 */ |
| 299 | if (min_region_size & (min_region_size - 1)) |
| 300 | region_size = 1 << fls(region_size); |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 301 | DMINFO("Choosing default region size of %lu sectors", |
| 302 | region_size); |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 303 | } else { |
| 304 | DMINFO("Choosing default region size of 4MiB"); |
| 305 | region_size = 1 << 13; /* sectors */ |
| 306 | } |
| 307 | } else { |
| 308 | /* |
| 309 | * Validate user-supplied value. |
| 310 | */ |
| 311 | if (region_size > rs->ti->len) { |
| 312 | rs->ti->error = "Supplied region size is too large"; |
| 313 | return -EINVAL; |
| 314 | } |
| 315 | |
| 316 | if (region_size < min_region_size) { |
| 317 | DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", |
| 318 | region_size, min_region_size); |
| 319 | rs->ti->error = "Supplied region size is too small"; |
| 320 | return -EINVAL; |
| 321 | } |
| 322 | |
| 323 | if (!is_power_of_2(region_size)) { |
| 324 | rs->ti->error = "Region size is not a power of 2"; |
| 325 | return -EINVAL; |
| 326 | } |
| 327 | |
| 328 | if (region_size < rs->md.chunk_sectors) { |
| 329 | rs->ti->error = "Region size is smaller than the chunk size"; |
| 330 | return -EINVAL; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * Convert sectors to bytes. |
| 336 | */ |
| 337 | rs->md.bitmap_info.chunksize = (region_size << 9); |
| 338 | |
| 339 | return 0; |
| 340 | } |
| 341 | |
| 342 | /* |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 343 | * validate_raid_redundancy |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 344 | * @rs |
| 345 | * |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 346 | * Determine if there are enough devices in the array that haven't |
| 347 | * failed (or are being rebuilt) to form a usable array. |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 348 | * |
| 349 | * Returns: 0 on success, -EINVAL on failure. |
| 350 | */ |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 351 | static int validate_raid_redundancy(struct raid_set *rs) |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 352 | { |
| 353 | unsigned i, rebuild_cnt = 0; |
Jonathan Brassow | 4ec1e36 | 2012-10-11 13:40:24 +1100 | [diff] [blame] | 354 | unsigned rebuilds_per_group, copies, d; |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 355 | |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 356 | for (i = 0; i < rs->md.raid_disks; i++) |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 357 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || |
| 358 | !rs->dev[i].rdev.sb_page) |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 359 | rebuild_cnt++; |
| 360 | |
| 361 | switch (rs->raid_type->level) { |
| 362 | case 1: |
| 363 | if (rebuild_cnt >= rs->md.raid_disks) |
| 364 | goto too_many; |
| 365 | break; |
| 366 | case 4: |
| 367 | case 5: |
| 368 | case 6: |
| 369 | if (rebuild_cnt > rs->raid_type->parity_devs) |
| 370 | goto too_many; |
| 371 | break; |
| 372 | case 10: |
Jonathan Brassow | 4ec1e36 | 2012-10-11 13:40:24 +1100 | [diff] [blame] | 373 | copies = raid10_md_layout_to_copies(rs->md.layout); |
| 374 | if (rebuild_cnt < copies) |
| 375 | break; |
| 376 | |
| 377 | /* |
| 378 | * It is possible to have a higher rebuild count for RAID10, |
| 379 | * as long as the failed devices occur in different mirror |
| 380 | * groups (i.e. different stripes). |
| 381 | * |
| 382 | * Right now, we only allow for "near" copies. When other |
| 383 | * formats are added, we will have to check those too. |
| 384 | * |
| 385 | * When checking "near" format, make sure no adjacent devices |
| 386 | * have failed beyond what can be handled. In addition to the |
| 387 | * simple case where the number of devices is a multiple of the |
| 388 | * number of copies, we must also handle cases where the number |
| 389 | * of devices is not a multiple of the number of copies. |
| 390 | * E.g. dev1 dev2 dev3 dev4 dev5 |
| 391 | * A A B B C |
| 392 | * C D D E E |
| 393 | */ |
Jonathan Brassow | 4ec1e36 | 2012-10-11 13:40:24 +1100 | [diff] [blame] | 394 | for (i = 0; i < rs->md.raid_disks * copies; i++) { |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 395 | if (!(i % copies)) |
| 396 | rebuilds_per_group = 0; |
Jonathan Brassow | 4ec1e36 | 2012-10-11 13:40:24 +1100 | [diff] [blame] | 397 | d = i % rs->md.raid_disks; |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 398 | if ((!rs->dev[d].rdev.sb_page || |
| 399 | !test_bit(In_sync, &rs->dev[d].rdev.flags)) && |
Jonathan Brassow | 4ec1e36 | 2012-10-11 13:40:24 +1100 | [diff] [blame] | 400 | (++rebuilds_per_group >= copies)) |
| 401 | goto too_many; |
Jonathan Brassow | 4ec1e36 | 2012-10-11 13:40:24 +1100 | [diff] [blame] | 402 | } |
| 403 | break; |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 404 | default: |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 405 | if (rebuild_cnt) |
| 406 | return -EINVAL; |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 407 | } |
| 408 | |
| 409 | return 0; |
| 410 | |
| 411 | too_many: |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 412 | return -EINVAL; |
| 413 | } |
| 414 | |
| 415 | /* |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 416 | * Possible arguments are... |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 417 | * <chunk_size> [optional_args] |
| 418 | * |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 419 | * Argument definitions |
| 420 | * <chunk_size> The number of sectors per disk that |
| 421 | * will form the "stripe" |
| 422 | * [[no]sync] Force or prevent recovery of the |
| 423 | * entire array |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 424 | * [rebuild <idx>] Rebuild the drive indicated by the index |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 425 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
| 426 | * clear bits |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 427 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
| 428 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 429 | * [write_mostly <idx>] Indicate a write mostly drive via index |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 430 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
| 431 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 432 | * [region_size <sectors>] Defines granularity of bitmap |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 433 | * |
| 434 | * RAID10-only options: |
| 435 | * [raid10_copies <# copies>] Number of copies. (Default: 2) |
| 436 | * [raid10_format <near>] Layout algorithm. (Default: near) |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 437 | */ |
| 438 | static int parse_raid_params(struct raid_set *rs, char **argv, |
| 439 | unsigned num_raid_params) |
| 440 | { |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 441 | char *raid10_format = "near"; |
| 442 | unsigned raid10_copies = 2; |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 443 | unsigned i; |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 444 | unsigned long value, region_size = 0; |
Jonathan E Brassow | c039c33 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 445 | sector_t sectors_per_dev = rs->ti->len; |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 446 | sector_t max_io_len; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 447 | char *key; |
| 448 | |
| 449 | /* |
| 450 | * First, parse the in-order required arguments |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 451 | * "chunk_size" is the only argument of this type. |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 452 | */ |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 453 | if ((strict_strtoul(argv[0], 10, &value) < 0)) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 454 | rs->ti->error = "Bad chunk size"; |
| 455 | return -EINVAL; |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 456 | } else if (rs->raid_type->level == 1) { |
| 457 | if (value) |
| 458 | DMERR("Ignoring chunk size parameter for RAID 1"); |
| 459 | value = 0; |
| 460 | } else if (!is_power_of_2(value)) { |
| 461 | rs->ti->error = "Chunk size must be a power of 2"; |
| 462 | return -EINVAL; |
| 463 | } else if (value < 8) { |
| 464 | rs->ti->error = "Chunk size value is too small"; |
| 465 | return -EINVAL; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; |
| 469 | argv++; |
| 470 | num_raid_params--; |
| 471 | |
| 472 | /* |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 473 | * We set each individual device as In_sync with a completed |
| 474 | * 'recovery_offset'. If there has been a device failure or |
| 475 | * replacement then one of the following cases applies: |
| 476 | * |
| 477 | * 1) User specifies 'rebuild'. |
| 478 | * - Device is reset when param is read. |
| 479 | * 2) A new device is supplied. |
| 480 | * - No matching superblock found, resets device. |
| 481 | * 3) Device failure was transient and returns on reload. |
| 482 | * - Failure noticed, resets device for bitmap replay. |
| 483 | * 4) Device hadn't completed recovery after previous failure. |
| 484 | * - Superblock is read and overrides recovery_offset. |
| 485 | * |
| 486 | * What is found in the superblocks of the devices is always |
| 487 | * authoritative, unless 'rebuild' or '[no]sync' was specified. |
| 488 | */ |
| 489 | for (i = 0; i < rs->md.raid_disks; i++) { |
| 490 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
| 491 | rs->dev[i].rdev.recovery_offset = MaxSector; |
| 492 | } |
| 493 | |
| 494 | /* |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 495 | * Second, parse the unordered optional arguments |
| 496 | */ |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 497 | for (i = 0; i < num_raid_params; i++) { |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 498 | if (!strcasecmp(argv[i], "nosync")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 499 | rs->md.recovery_cp = MaxSector; |
| 500 | rs->print_flags |= DMPF_NOSYNC; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 501 | continue; |
| 502 | } |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 503 | if (!strcasecmp(argv[i], "sync")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 504 | rs->md.recovery_cp = 0; |
| 505 | rs->print_flags |= DMPF_SYNC; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 506 | continue; |
| 507 | } |
| 508 | |
| 509 | /* The rest of the optional arguments come in key/value pairs */ |
| 510 | if ((i + 1) >= num_raid_params) { |
| 511 | rs->ti->error = "Wrong number of raid parameters given"; |
| 512 | return -EINVAL; |
| 513 | } |
| 514 | |
| 515 | key = argv[i++]; |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 516 | |
| 517 | /* Parameters that take a string value are checked here. */ |
| 518 | if (!strcasecmp(key, "raid10_format")) { |
| 519 | if (rs->raid_type->level != 10) { |
| 520 | rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type"; |
| 521 | return -EINVAL; |
| 522 | } |
| 523 | if (strcmp("near", argv[i])) { |
| 524 | rs->ti->error = "Invalid 'raid10_format' value given"; |
| 525 | return -EINVAL; |
| 526 | } |
| 527 | raid10_format = argv[i]; |
| 528 | rs->print_flags |= DMPF_RAID10_FORMAT; |
| 529 | continue; |
| 530 | } |
| 531 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 532 | if (strict_strtoul(argv[i], 10, &value) < 0) { |
| 533 | rs->ti->error = "Bad numerical argument given in raid params"; |
| 534 | return -EINVAL; |
| 535 | } |
| 536 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 537 | /* Parameters that take a numeric value are checked here */ |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 538 | if (!strcasecmp(key, "rebuild")) { |
Jonathan Brassow | 7386199 | 2012-10-11 13:40:36 +1100 | [diff] [blame] | 539 | if (value >= rs->md.raid_disks) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 540 | rs->ti->error = "Invalid rebuild index given"; |
| 541 | return -EINVAL; |
| 542 | } |
| 543 | clear_bit(In_sync, &rs->dev[value].rdev.flags); |
| 544 | rs->dev[value].rdev.recovery_offset = 0; |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 545 | rs->print_flags |= DMPF_REBUILD; |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 546 | } else if (!strcasecmp(key, "write_mostly")) { |
| 547 | if (rs->raid_type->level != 1) { |
| 548 | rs->ti->error = "write_mostly option is only valid for RAID1"; |
| 549 | return -EINVAL; |
| 550 | } |
Jonthan Brassow | 8232480 | 2011-09-25 23:26:19 +0100 | [diff] [blame] | 551 | if (value >= rs->md.raid_disks) { |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 552 | rs->ti->error = "Invalid write_mostly drive index given"; |
| 553 | return -EINVAL; |
| 554 | } |
| 555 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 556 | } else if (!strcasecmp(key, "max_write_behind")) { |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 557 | if (rs->raid_type->level != 1) { |
| 558 | rs->ti->error = "max_write_behind option is only valid for RAID1"; |
| 559 | return -EINVAL; |
| 560 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 561 | rs->print_flags |= DMPF_MAX_WRITE_BEHIND; |
| 562 | |
| 563 | /* |
| 564 | * In device-mapper, we specify things in sectors, but |
| 565 | * MD records this value in kB |
| 566 | */ |
| 567 | value /= 2; |
| 568 | if (value > COUNTER_MAX) { |
| 569 | rs->ti->error = "Max write-behind limit out of range"; |
| 570 | return -EINVAL; |
| 571 | } |
| 572 | rs->md.bitmap_info.max_write_behind = value; |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 573 | } else if (!strcasecmp(key, "daemon_sleep")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 574 | rs->print_flags |= DMPF_DAEMON_SLEEP; |
| 575 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) { |
| 576 | rs->ti->error = "daemon sleep period out of range"; |
| 577 | return -EINVAL; |
| 578 | } |
| 579 | rs->md.bitmap_info.daemon_sleep = value; |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 580 | } else if (!strcasecmp(key, "stripe_cache")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 581 | rs->print_flags |= DMPF_STRIPE_CACHE; |
| 582 | |
| 583 | /* |
| 584 | * In device-mapper, we specify things in sectors, but |
| 585 | * MD records this value in kB |
| 586 | */ |
| 587 | value /= 2; |
| 588 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 589 | if ((rs->raid_type->level != 5) && |
| 590 | (rs->raid_type->level != 6)) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 591 | rs->ti->error = "Inappropriate argument: stripe_cache"; |
| 592 | return -EINVAL; |
| 593 | } |
| 594 | if (raid5_set_cache_size(&rs->md, (int)value)) { |
| 595 | rs->ti->error = "Bad stripe_cache size"; |
| 596 | return -EINVAL; |
| 597 | } |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 598 | } else if (!strcasecmp(key, "min_recovery_rate")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 599 | rs->print_flags |= DMPF_MIN_RECOVERY_RATE; |
| 600 | if (value > INT_MAX) { |
| 601 | rs->ti->error = "min_recovery_rate out of range"; |
| 602 | return -EINVAL; |
| 603 | } |
| 604 | rs->md.sync_speed_min = (int)value; |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 605 | } else if (!strcasecmp(key, "max_recovery_rate")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 606 | rs->print_flags |= DMPF_MAX_RECOVERY_RATE; |
| 607 | if (value > INT_MAX) { |
| 608 | rs->ti->error = "max_recovery_rate out of range"; |
| 609 | return -EINVAL; |
| 610 | } |
| 611 | rs->md.sync_speed_max = (int)value; |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 612 | } else if (!strcasecmp(key, "region_size")) { |
| 613 | rs->print_flags |= DMPF_REGION_SIZE; |
| 614 | region_size = value; |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 615 | } else if (!strcasecmp(key, "raid10_copies") && |
| 616 | (rs->raid_type->level == 10)) { |
| 617 | if ((value < 2) || (value > 0xFF)) { |
| 618 | rs->ti->error = "Bad value for 'raid10_copies'"; |
| 619 | return -EINVAL; |
| 620 | } |
| 621 | rs->print_flags |= DMPF_RAID10_COPIES; |
| 622 | raid10_copies = value; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 623 | } else { |
| 624 | DMERR("Unable to parse RAID parameter: %s", key); |
| 625 | rs->ti->error = "Unable to parse RAID parameters"; |
| 626 | return -EINVAL; |
| 627 | } |
| 628 | } |
| 629 | |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 630 | if (validate_region_size(rs, region_size)) |
| 631 | return -EINVAL; |
| 632 | |
| 633 | if (rs->md.chunk_sectors) |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 634 | max_io_len = rs->md.chunk_sectors; |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 635 | else |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 636 | max_io_len = region_size; |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 637 | |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 638 | if (dm_set_target_max_io_len(rs->ti, max_io_len)) |
| 639 | return -EINVAL; |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 640 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 641 | if (rs->raid_type->level == 10) { |
| 642 | if (raid10_copies > rs->md.raid_disks) { |
| 643 | rs->ti->error = "Not enough devices to satisfy specification"; |
| 644 | return -EINVAL; |
| 645 | } |
| 646 | |
| 647 | /* (Len * #mirrors) / #devices */ |
| 648 | sectors_per_dev = rs->ti->len * raid10_copies; |
| 649 | sector_div(sectors_per_dev, rs->md.raid_disks); |
| 650 | |
| 651 | rs->md.layout = raid10_format_to_md_layout(raid10_format, |
| 652 | raid10_copies); |
| 653 | rs->md.new_layout = rs->md.layout; |
| 654 | } else if ((rs->raid_type->level > 1) && |
| 655 | sector_div(sectors_per_dev, |
| 656 | (rs->md.raid_disks - rs->raid_type->parity_devs))) { |
Jonathan E Brassow | c039c33 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 657 | rs->ti->error = "Target length not divisible by number of data devices"; |
| 658 | return -EINVAL; |
| 659 | } |
| 660 | rs->md.dev_sectors = sectors_per_dev; |
| 661 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 662 | /* Assume there are no metadata devices until the drives are parsed */ |
| 663 | rs->md.persistent = 0; |
| 664 | rs->md.external = 1; |
| 665 | |
| 666 | return 0; |
| 667 | } |
| 668 | |
| 669 | static void do_table_event(struct work_struct *ws) |
| 670 | { |
| 671 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); |
| 672 | |
| 673 | dm_table_event(rs->ti->table); |
| 674 | } |
| 675 | |
| 676 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) |
| 677 | { |
| 678 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); |
| 679 | |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 680 | if (rs->raid_type->level == 1) |
| 681 | return md_raid1_congested(&rs->md, bits); |
| 682 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 683 | if (rs->raid_type->level == 10) |
| 684 | return md_raid10_congested(&rs->md, bits); |
| 685 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 686 | return md_raid5_congested(&rs->md, bits); |
| 687 | } |
| 688 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 689 | /* |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 690 | * This structure is never routinely used by userspace, unlike md superblocks. |
| 691 | * Devices with this superblock should only ever be accessed via device-mapper. |
| 692 | */ |
| 693 | #define DM_RAID_MAGIC 0x64526D44 |
| 694 | struct dm_raid_superblock { |
| 695 | __le32 magic; /* "DmRd" */ |
| 696 | __le32 features; /* Used to indicate possible future changes */ |
| 697 | |
| 698 | __le32 num_devices; /* Number of devices in this array. (Max 64) */ |
| 699 | __le32 array_position; /* The position of this drive in the array */ |
| 700 | |
| 701 | __le64 events; /* Incremented by md when superblock updated */ |
| 702 | __le64 failed_devices; /* Bit field of devices to indicate failures */ |
| 703 | |
| 704 | /* |
| 705 | * This offset tracks the progress of the repair or replacement of |
| 706 | * an individual drive. |
| 707 | */ |
| 708 | __le64 disk_recovery_offset; |
| 709 | |
| 710 | /* |
| 711 | * This offset tracks the progress of the initial array |
| 712 | * synchronisation/parity calculation. |
| 713 | */ |
| 714 | __le64 array_resync_offset; |
| 715 | |
| 716 | /* |
| 717 | * RAID characteristics |
| 718 | */ |
| 719 | __le32 level; |
| 720 | __le32 layout; |
| 721 | __le32 stripe_sectors; |
| 722 | |
| 723 | __u8 pad[452]; /* Round struct to 512 bytes. */ |
| 724 | /* Always set to 0 when writing. */ |
| 725 | } __packed; |
| 726 | |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 727 | static int read_disk_sb(struct md_rdev *rdev, int size) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 728 | { |
| 729 | BUG_ON(!rdev->sb_page); |
| 730 | |
| 731 | if (rdev->sb_loaded) |
| 732 | return 0; |
| 733 | |
| 734 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) { |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 735 | DMERR("Failed to read superblock of device at position %d", |
| 736 | rdev->raid_disk); |
Jonathan Brassow | c32fb9e | 2012-05-22 13:55:31 +1000 | [diff] [blame] | 737 | md_error(rdev->mddev, rdev); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 738 | return -EINVAL; |
| 739 | } |
| 740 | |
| 741 | rdev->sb_loaded = 1; |
| 742 | |
| 743 | return 0; |
| 744 | } |
| 745 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 746 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 747 | { |
Jonathan Brassow | 81f382f | 2012-05-22 13:55:30 +1000 | [diff] [blame] | 748 | int i; |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 749 | uint64_t failed_devices; |
| 750 | struct dm_raid_superblock *sb; |
Jonathan Brassow | 81f382f | 2012-05-22 13:55:30 +1000 | [diff] [blame] | 751 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 752 | |
| 753 | sb = page_address(rdev->sb_page); |
| 754 | failed_devices = le64_to_cpu(sb->failed_devices); |
| 755 | |
Jonathan Brassow | 81f382f | 2012-05-22 13:55:30 +1000 | [diff] [blame] | 756 | for (i = 0; i < mddev->raid_disks; i++) |
| 757 | if (!rs->dev[i].data_dev || |
| 758 | test_bit(Faulty, &(rs->dev[i].rdev.flags))) |
| 759 | failed_devices |= (1ULL << i); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 760 | |
| 761 | memset(sb, 0, sizeof(*sb)); |
| 762 | |
| 763 | sb->magic = cpu_to_le32(DM_RAID_MAGIC); |
| 764 | sb->features = cpu_to_le32(0); /* No features yet */ |
| 765 | |
| 766 | sb->num_devices = cpu_to_le32(mddev->raid_disks); |
| 767 | sb->array_position = cpu_to_le32(rdev->raid_disk); |
| 768 | |
| 769 | sb->events = cpu_to_le64(mddev->events); |
| 770 | sb->failed_devices = cpu_to_le64(failed_devices); |
| 771 | |
| 772 | sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); |
| 773 | sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); |
| 774 | |
| 775 | sb->level = cpu_to_le32(mddev->level); |
| 776 | sb->layout = cpu_to_le32(mddev->layout); |
| 777 | sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); |
| 778 | } |
| 779 | |
| 780 | /* |
| 781 | * super_load |
| 782 | * |
| 783 | * This function creates a superblock if one is not found on the device |
| 784 | * and will decide which superblock to use if there's a choice. |
| 785 | * |
| 786 | * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise |
| 787 | */ |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 788 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 789 | { |
| 790 | int ret; |
| 791 | struct dm_raid_superblock *sb; |
| 792 | struct dm_raid_superblock *refsb; |
| 793 | uint64_t events_sb, events_refsb; |
| 794 | |
| 795 | rdev->sb_start = 0; |
| 796 | rdev->sb_size = sizeof(*sb); |
| 797 | |
| 798 | ret = read_disk_sb(rdev, rdev->sb_size); |
| 799 | if (ret) |
| 800 | return ret; |
| 801 | |
| 802 | sb = page_address(rdev->sb_page); |
Jonathan E Brassow | 3aa3b2b | 2012-03-07 19:09:47 +0000 | [diff] [blame] | 803 | |
| 804 | /* |
| 805 | * Two cases that we want to write new superblocks and rebuild: |
| 806 | * 1) New device (no matching magic number) |
| 807 | * 2) Device specified for rebuild (!In_sync w/ offset == 0) |
| 808 | */ |
| 809 | if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) || |
| 810 | (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) { |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 811 | super_sync(rdev->mddev, rdev); |
| 812 | |
| 813 | set_bit(FirstUse, &rdev->flags); |
| 814 | |
| 815 | /* Force writing of superblocks to disk */ |
| 816 | set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags); |
| 817 | |
| 818 | /* Any superblock is better than none, choose that if given */ |
| 819 | return refdev ? 0 : 1; |
| 820 | } |
| 821 | |
| 822 | if (!refdev) |
| 823 | return 1; |
| 824 | |
| 825 | events_sb = le64_to_cpu(sb->events); |
| 826 | |
| 827 | refsb = page_address(refdev->sb_page); |
| 828 | events_refsb = le64_to_cpu(refsb->events); |
| 829 | |
| 830 | return (events_sb > events_refsb) ? 1 : 0; |
| 831 | } |
| 832 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 833 | static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 834 | { |
| 835 | int role; |
| 836 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
| 837 | uint64_t events_sb; |
| 838 | uint64_t failed_devices; |
| 839 | struct dm_raid_superblock *sb; |
| 840 | uint32_t new_devs = 0; |
| 841 | uint32_t rebuilds = 0; |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 842 | struct md_rdev *r; |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 843 | struct dm_raid_superblock *sb2; |
| 844 | |
| 845 | sb = page_address(rdev->sb_page); |
| 846 | events_sb = le64_to_cpu(sb->events); |
| 847 | failed_devices = le64_to_cpu(sb->failed_devices); |
| 848 | |
| 849 | /* |
| 850 | * Initialise to 1 if this is a new superblock. |
| 851 | */ |
| 852 | mddev->events = events_sb ? : 1; |
| 853 | |
| 854 | /* |
| 855 | * Reshaping is not currently allowed |
| 856 | */ |
| 857 | if ((le32_to_cpu(sb->level) != mddev->level) || |
| 858 | (le32_to_cpu(sb->layout) != mddev->layout) || |
| 859 | (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors)) { |
| 860 | DMERR("Reshaping arrays not yet supported."); |
| 861 | return -EINVAL; |
| 862 | } |
| 863 | |
| 864 | /* We can only change the number of devices in RAID1 right now */ |
| 865 | if ((rs->raid_type->level != 1) && |
| 866 | (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) { |
| 867 | DMERR("Reshaping arrays not yet supported."); |
| 868 | return -EINVAL; |
| 869 | } |
| 870 | |
| 871 | if (!(rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))) |
| 872 | mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); |
| 873 | |
| 874 | /* |
| 875 | * During load, we set FirstUse if a new superblock was written. |
| 876 | * There are two reasons we might not have a superblock: |
| 877 | * 1) The array is brand new - in which case, all of the |
| 878 | * devices must have their In_sync bit set. Also, |
| 879 | * recovery_cp must be 0, unless forced. |
| 880 | * 2) This is a new device being added to an old array |
| 881 | * and the new device needs to be rebuilt - in which |
| 882 | * case the In_sync bit will /not/ be set and |
| 883 | * recovery_cp must be MaxSector. |
| 884 | */ |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 885 | rdev_for_each(r, mddev) { |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 886 | if (!test_bit(In_sync, &r->flags)) { |
Jonathan E Brassow | 3aa3b2b | 2012-03-07 19:09:47 +0000 | [diff] [blame] | 887 | DMINFO("Device %d specified for rebuild: " |
| 888 | "Clearing superblock", r->raid_disk); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 889 | rebuilds++; |
| 890 | } else if (test_bit(FirstUse, &r->flags)) |
| 891 | new_devs++; |
| 892 | } |
| 893 | |
| 894 | if (!rebuilds) { |
| 895 | if (new_devs == mddev->raid_disks) { |
| 896 | DMINFO("Superblocks created for new array"); |
| 897 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); |
| 898 | } else if (new_devs) { |
| 899 | DMERR("New device injected " |
| 900 | "into existing array without 'rebuild' " |
| 901 | "parameter specified"); |
| 902 | return -EINVAL; |
| 903 | } |
| 904 | } else if (new_devs) { |
| 905 | DMERR("'rebuild' devices cannot be " |
| 906 | "injected into an array with other first-time devices"); |
| 907 | return -EINVAL; |
| 908 | } else if (mddev->recovery_cp != MaxSector) { |
| 909 | DMERR("'rebuild' specified while array is not in-sync"); |
| 910 | return -EINVAL; |
| 911 | } |
| 912 | |
| 913 | /* |
| 914 | * Now we set the Faulty bit for those devices that are |
| 915 | * recorded in the superblock as failed. |
| 916 | */ |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 917 | rdev_for_each(r, mddev) { |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 918 | if (!r->sb_page) |
| 919 | continue; |
| 920 | sb2 = page_address(r->sb_page); |
| 921 | sb2->failed_devices = 0; |
| 922 | |
| 923 | /* |
| 924 | * Check for any device re-ordering. |
| 925 | */ |
| 926 | if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) { |
| 927 | role = le32_to_cpu(sb2->array_position); |
| 928 | if (role != r->raid_disk) { |
| 929 | if (rs->raid_type->level != 1) { |
| 930 | rs->ti->error = "Cannot change device " |
| 931 | "positions in RAID array"; |
| 932 | return -EINVAL; |
| 933 | } |
| 934 | DMINFO("RAID1 device #%d now at position #%d", |
| 935 | role, r->raid_disk); |
| 936 | } |
| 937 | |
| 938 | /* |
| 939 | * Partial recovery is performed on |
| 940 | * returning failed devices. |
| 941 | */ |
| 942 | if (failed_devices & (1 << role)) |
| 943 | set_bit(Faulty, &r->flags); |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | return 0; |
| 948 | } |
| 949 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 950 | static int super_validate(struct mddev *mddev, struct md_rdev *rdev) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 951 | { |
| 952 | struct dm_raid_superblock *sb = page_address(rdev->sb_page); |
| 953 | |
| 954 | /* |
| 955 | * If mddev->events is not set, we know we have not yet initialized |
| 956 | * the array. |
| 957 | */ |
| 958 | if (!mddev->events && super_init_validation(mddev, rdev)) |
| 959 | return -EINVAL; |
| 960 | |
| 961 | mddev->bitmap_info.offset = 4096 >> 9; /* Enable bitmap creation */ |
| 962 | rdev->mddev->bitmap_info.default_offset = 4096 >> 9; |
| 963 | if (!test_bit(FirstUse, &rdev->flags)) { |
| 964 | rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); |
| 965 | if (rdev->recovery_offset != MaxSector) |
| 966 | clear_bit(In_sync, &rdev->flags); |
| 967 | } |
| 968 | |
| 969 | /* |
| 970 | * If a device comes back, set it as not In_sync and no longer faulty. |
| 971 | */ |
| 972 | if (test_bit(Faulty, &rdev->flags)) { |
| 973 | clear_bit(Faulty, &rdev->flags); |
| 974 | clear_bit(In_sync, &rdev->flags); |
| 975 | rdev->saved_raid_disk = rdev->raid_disk; |
| 976 | rdev->recovery_offset = 0; |
| 977 | } |
| 978 | |
| 979 | clear_bit(FirstUse, &rdev->flags); |
| 980 | |
| 981 | return 0; |
| 982 | } |
| 983 | |
| 984 | /* |
| 985 | * Analyse superblocks and select the freshest. |
| 986 | */ |
| 987 | static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) |
| 988 | { |
| 989 | int ret; |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 990 | struct raid_dev *dev; |
Jonathan Brassow | a9ad852 | 2012-04-24 10:23:13 +1000 | [diff] [blame] | 991 | struct md_rdev *rdev, *tmp, *freshest; |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 992 | struct mddev *mddev = &rs->md; |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 993 | |
| 994 | freshest = NULL; |
Jonathan Brassow | a9ad852 | 2012-04-24 10:23:13 +1000 | [diff] [blame] | 995 | rdev_for_each_safe(rdev, tmp, mddev) { |
Jonathan Brassow | 761becf | 2012-10-11 13:42:19 +1100 | [diff] [blame] | 996 | /* |
| 997 | * Skipping super_load due to DMPF_SYNC will cause |
| 998 | * the array to undergo initialization again as |
| 999 | * though it were new. This is the intended effect |
| 1000 | * of the "sync" directive. |
| 1001 | * |
| 1002 | * When reshaping capability is added, we must ensure |
| 1003 | * that the "sync" directive is disallowed during the |
| 1004 | * reshape. |
| 1005 | */ |
| 1006 | if (rs->print_flags & DMPF_SYNC) |
| 1007 | continue; |
| 1008 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1009 | if (!rdev->meta_bdev) |
| 1010 | continue; |
| 1011 | |
| 1012 | ret = super_load(rdev, freshest); |
| 1013 | |
| 1014 | switch (ret) { |
| 1015 | case 1: |
| 1016 | freshest = rdev; |
| 1017 | break; |
| 1018 | case 0: |
| 1019 | break; |
| 1020 | default: |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1021 | dev = container_of(rdev, struct raid_dev, rdev); |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1022 | if (dev->meta_dev) |
| 1023 | dm_put_device(ti, dev->meta_dev); |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1024 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1025 | dev->meta_dev = NULL; |
| 1026 | rdev->meta_bdev = NULL; |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1027 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1028 | if (rdev->sb_page) |
| 1029 | put_page(rdev->sb_page); |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1030 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1031 | rdev->sb_page = NULL; |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1032 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1033 | rdev->sb_loaded = 0; |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1034 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1035 | /* |
| 1036 | * We might be able to salvage the data device |
| 1037 | * even though the meta device has failed. For |
| 1038 | * now, we behave as though '- -' had been |
| 1039 | * set for this device in the table. |
| 1040 | */ |
| 1041 | if (dev->data_dev) |
| 1042 | dm_put_device(ti, dev->data_dev); |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1043 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1044 | dev->data_dev = NULL; |
| 1045 | rdev->bdev = NULL; |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1046 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1047 | list_del(&rdev->same_set); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | if (!freshest) |
| 1052 | return 0; |
| 1053 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1054 | if (validate_raid_redundancy(rs)) { |
| 1055 | rs->ti->error = "Insufficient redundancy to activate array"; |
| 1056 | return -EINVAL; |
| 1057 | } |
| 1058 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1059 | /* |
| 1060 | * Validation of the freshest device provides the source of |
| 1061 | * validation for the remaining devices. |
| 1062 | */ |
| 1063 | ti->error = "Unable to assemble array: Invalid superblocks"; |
| 1064 | if (super_validate(mddev, freshest)) |
| 1065 | return -EINVAL; |
| 1066 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 1067 | rdev_for_each(rdev, mddev) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1068 | if ((rdev != freshest) && super_validate(mddev, rdev)) |
| 1069 | return -EINVAL; |
| 1070 | |
| 1071 | return 0; |
| 1072 | } |
| 1073 | |
| 1074 | /* |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1075 | * Construct a RAID4/5/6 mapping: |
| 1076 | * Args: |
| 1077 | * <raid_type> <#raid_params> <raid_params> \ |
| 1078 | * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> } |
| 1079 | * |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1080 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
| 1081 | * details on possible <raid_params>. |
| 1082 | */ |
| 1083 | static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) |
| 1084 | { |
| 1085 | int ret; |
| 1086 | struct raid_type *rt; |
| 1087 | unsigned long num_raid_params, num_raid_devs; |
| 1088 | struct raid_set *rs = NULL; |
| 1089 | |
| 1090 | /* Must have at least <raid_type> <#raid_params> */ |
| 1091 | if (argc < 2) { |
| 1092 | ti->error = "Too few arguments"; |
| 1093 | return -EINVAL; |
| 1094 | } |
| 1095 | |
| 1096 | /* raid type */ |
| 1097 | rt = get_raid_type(argv[0]); |
| 1098 | if (!rt) { |
| 1099 | ti->error = "Unrecognised raid_type"; |
| 1100 | return -EINVAL; |
| 1101 | } |
| 1102 | argc--; |
| 1103 | argv++; |
| 1104 | |
| 1105 | /* number of RAID parameters */ |
| 1106 | if (strict_strtoul(argv[0], 10, &num_raid_params) < 0) { |
| 1107 | ti->error = "Cannot understand number of RAID parameters"; |
| 1108 | return -EINVAL; |
| 1109 | } |
| 1110 | argc--; |
| 1111 | argv++; |
| 1112 | |
| 1113 | /* Skip over RAID params for now and find out # of devices */ |
| 1114 | if (num_raid_params + 1 > argc) { |
| 1115 | ti->error = "Arguments do not agree with counts given"; |
| 1116 | return -EINVAL; |
| 1117 | } |
| 1118 | |
| 1119 | if ((strict_strtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || |
| 1120 | (num_raid_devs >= INT_MAX)) { |
| 1121 | ti->error = "Cannot understand number of raid devices"; |
| 1122 | return -EINVAL; |
| 1123 | } |
| 1124 | |
| 1125 | rs = context_alloc(ti, rt, (unsigned)num_raid_devs); |
| 1126 | if (IS_ERR(rs)) |
| 1127 | return PTR_ERR(rs); |
| 1128 | |
| 1129 | ret = parse_raid_params(rs, argv, (unsigned)num_raid_params); |
| 1130 | if (ret) |
| 1131 | goto bad; |
| 1132 | |
| 1133 | ret = -EINVAL; |
| 1134 | |
| 1135 | argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */ |
| 1136 | argv += num_raid_params + 1; |
| 1137 | |
| 1138 | if (argc != (num_raid_devs * 2)) { |
| 1139 | ti->error = "Supplied RAID devices does not match the count given"; |
| 1140 | goto bad; |
| 1141 | } |
| 1142 | |
| 1143 | ret = dev_parms(rs, argv); |
| 1144 | if (ret) |
| 1145 | goto bad; |
| 1146 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1147 | rs->md.sync_super = super_sync; |
| 1148 | ret = analyse_superblocks(ti, rs); |
| 1149 | if (ret) |
| 1150 | goto bad; |
| 1151 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1152 | INIT_WORK(&rs->md.event_work, do_table_event); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1153 | ti->private = rs; |
Jonathan E Brassow | 0ca93de | 2012-03-07 19:09:48 +0000 | [diff] [blame] | 1154 | ti->num_flush_requests = 1; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1155 | |
| 1156 | mutex_lock(&rs->md.reconfig_mutex); |
| 1157 | ret = md_run(&rs->md); |
| 1158 | rs->md.in_sync = 0; /* Assume already marked dirty */ |
| 1159 | mutex_unlock(&rs->md.reconfig_mutex); |
| 1160 | |
| 1161 | if (ret) { |
| 1162 | ti->error = "Fail to run raid array"; |
| 1163 | goto bad; |
| 1164 | } |
| 1165 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 1166 | if (ti->len != rs->md.array_sectors) { |
| 1167 | ti->error = "Array size does not match requested target length"; |
| 1168 | ret = -EINVAL; |
| 1169 | goto size_mismatch; |
| 1170 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1171 | rs->callbacks.congested_fn = raid_is_congested; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1172 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
| 1173 | |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1174 | mddev_suspend(&rs->md); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1175 | return 0; |
| 1176 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 1177 | size_mismatch: |
| 1178 | md_stop(&rs->md); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1179 | bad: |
| 1180 | context_free(rs); |
| 1181 | |
| 1182 | return ret; |
| 1183 | } |
| 1184 | |
| 1185 | static void raid_dtr(struct dm_target *ti) |
| 1186 | { |
| 1187 | struct raid_set *rs = ti->private; |
| 1188 | |
| 1189 | list_del_init(&rs->callbacks.list); |
| 1190 | md_stop(&rs->md); |
| 1191 | context_free(rs); |
| 1192 | } |
| 1193 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 1194 | static int raid_map(struct dm_target *ti, struct bio *bio) |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1195 | { |
| 1196 | struct raid_set *rs = ti->private; |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1197 | struct mddev *mddev = &rs->md; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1198 | |
| 1199 | mddev->pers->make_request(mddev, bio); |
| 1200 | |
| 1201 | return DM_MAPIO_SUBMITTED; |
| 1202 | } |
| 1203 | |
| 1204 | static int raid_status(struct dm_target *ti, status_type_t type, |
Alasdair G Kergon | 1f4e0ff | 2012-07-27 15:08:16 +0100 | [diff] [blame] | 1205 | unsigned status_flags, char *result, unsigned maxlen) |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1206 | { |
| 1207 | struct raid_set *rs = ti->private; |
| 1208 | unsigned raid_param_cnt = 1; /* at least 1 for chunksize */ |
| 1209 | unsigned sz = 0; |
Jonathan E Brassow | 2e727c3 | 2011-10-31 20:21:26 +0000 | [diff] [blame] | 1210 | int i, array_in_sync = 0; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1211 | sector_t sync; |
| 1212 | |
| 1213 | switch (type) { |
| 1214 | case STATUSTYPE_INFO: |
| 1215 | DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks); |
| 1216 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1217 | if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery)) |
| 1218 | sync = rs->md.curr_resync_completed; |
| 1219 | else |
| 1220 | sync = rs->md.recovery_cp; |
| 1221 | |
Jonathan E Brassow | 2e727c3 | 2011-10-31 20:21:26 +0000 | [diff] [blame] | 1222 | if (sync >= rs->md.resync_max_sectors) { |
| 1223 | array_in_sync = 1; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1224 | sync = rs->md.resync_max_sectors; |
Jonathan E Brassow | 2e727c3 | 2011-10-31 20:21:26 +0000 | [diff] [blame] | 1225 | } else { |
| 1226 | /* |
| 1227 | * The array may be doing an initial sync, or it may |
| 1228 | * be rebuilding individual components. If all the |
| 1229 | * devices are In_sync, then it is the array that is |
| 1230 | * being initialized. |
| 1231 | */ |
| 1232 | for (i = 0; i < rs->md.raid_disks; i++) |
| 1233 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 1234 | array_in_sync = 1; |
| 1235 | } |
| 1236 | /* |
| 1237 | * Status characters: |
| 1238 | * 'D' = Dead/Failed device |
| 1239 | * 'a' = Alive but not in-sync |
| 1240 | * 'A' = Alive and in-sync |
| 1241 | */ |
| 1242 | for (i = 0; i < rs->md.raid_disks; i++) { |
| 1243 | if (test_bit(Faulty, &rs->dev[i].rdev.flags)) |
| 1244 | DMEMIT("D"); |
| 1245 | else if (!array_in_sync || |
| 1246 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 1247 | DMEMIT("a"); |
| 1248 | else |
| 1249 | DMEMIT("A"); |
| 1250 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1251 | |
Jonathan E Brassow | 2e727c3 | 2011-10-31 20:21:26 +0000 | [diff] [blame] | 1252 | /* |
| 1253 | * In-sync ratio: |
| 1254 | * The in-sync ratio shows the progress of: |
| 1255 | * - Initializing the array |
| 1256 | * - Rebuilding a subset of devices of the array |
| 1257 | * The user can distinguish between the two by referring |
| 1258 | * to the status characters. |
| 1259 | */ |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1260 | DMEMIT(" %llu/%llu", |
| 1261 | (unsigned long long) sync, |
| 1262 | (unsigned long long) rs->md.resync_max_sectors); |
| 1263 | |
| 1264 | break; |
| 1265 | case STATUSTYPE_TABLE: |
| 1266 | /* The string you would use to construct this array */ |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1267 | for (i = 0; i < rs->md.raid_disks; i++) { |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 1268 | if ((rs->print_flags & DMPF_REBUILD) && |
| 1269 | rs->dev[i].data_dev && |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1270 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 1271 | raid_param_cnt += 2; /* for rebuilds */ |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1272 | if (rs->dev[i].data_dev && |
| 1273 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) |
| 1274 | raid_param_cnt += 2; |
| 1275 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1276 | |
Jonathan Brassow | 34f8ac6d | 2012-01-27 14:53:53 -0600 | [diff] [blame] | 1277 | raid_param_cnt += (hweight32(rs->print_flags & ~DMPF_REBUILD) * 2); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1278 | if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)) |
| 1279 | raid_param_cnt--; |
| 1280 | |
| 1281 | DMEMIT("%s %u %u", rs->raid_type->name, |
| 1282 | raid_param_cnt, rs->md.chunk_sectors); |
| 1283 | |
| 1284 | if ((rs->print_flags & DMPF_SYNC) && |
| 1285 | (rs->md.recovery_cp == MaxSector)) |
| 1286 | DMEMIT(" sync"); |
| 1287 | if (rs->print_flags & DMPF_NOSYNC) |
| 1288 | DMEMIT(" nosync"); |
| 1289 | |
| 1290 | for (i = 0; i < rs->md.raid_disks; i++) |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 1291 | if ((rs->print_flags & DMPF_REBUILD) && |
| 1292 | rs->dev[i].data_dev && |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1293 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 1294 | DMEMIT(" rebuild %u", i); |
| 1295 | |
| 1296 | if (rs->print_flags & DMPF_DAEMON_SLEEP) |
| 1297 | DMEMIT(" daemon_sleep %lu", |
| 1298 | rs->md.bitmap_info.daemon_sleep); |
| 1299 | |
| 1300 | if (rs->print_flags & DMPF_MIN_RECOVERY_RATE) |
| 1301 | DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min); |
| 1302 | |
| 1303 | if (rs->print_flags & DMPF_MAX_RECOVERY_RATE) |
| 1304 | DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max); |
| 1305 | |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1306 | for (i = 0; i < rs->md.raid_disks; i++) |
| 1307 | if (rs->dev[i].data_dev && |
| 1308 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) |
| 1309 | DMEMIT(" write_mostly %u", i); |
| 1310 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1311 | if (rs->print_flags & DMPF_MAX_WRITE_BEHIND) |
| 1312 | DMEMIT(" max_write_behind %lu", |
| 1313 | rs->md.bitmap_info.max_write_behind); |
| 1314 | |
| 1315 | if (rs->print_flags & DMPF_STRIPE_CACHE) { |
NeilBrown | d1688a6 | 2011-10-11 16:49:52 +1100 | [diff] [blame] | 1316 | struct r5conf *conf = rs->md.private; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1317 | |
| 1318 | /* convert from kiB to sectors */ |
| 1319 | DMEMIT(" stripe_cache %d", |
| 1320 | conf ? conf->max_nr_stripes * 2 : 0); |
| 1321 | } |
| 1322 | |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1323 | if (rs->print_flags & DMPF_REGION_SIZE) |
| 1324 | DMEMIT(" region_size %lu", |
| 1325 | rs->md.bitmap_info.chunksize >> 9); |
| 1326 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 1327 | if (rs->print_flags & DMPF_RAID10_COPIES) |
| 1328 | DMEMIT(" raid10_copies %u", |
| 1329 | raid10_md_layout_to_copies(rs->md.layout)); |
| 1330 | |
| 1331 | if (rs->print_flags & DMPF_RAID10_FORMAT) |
| 1332 | DMEMIT(" raid10_format near"); |
| 1333 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1334 | DMEMIT(" %d", rs->md.raid_disks); |
| 1335 | for (i = 0; i < rs->md.raid_disks; i++) { |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1336 | if (rs->dev[i].meta_dev) |
| 1337 | DMEMIT(" %s", rs->dev[i].meta_dev->name); |
| 1338 | else |
| 1339 | DMEMIT(" -"); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1340 | |
| 1341 | if (rs->dev[i].data_dev) |
| 1342 | DMEMIT(" %s", rs->dev[i].data_dev->name); |
| 1343 | else |
| 1344 | DMEMIT(" -"); |
| 1345 | } |
| 1346 | } |
| 1347 | |
| 1348 | return 0; |
| 1349 | } |
| 1350 | |
| 1351 | static int raid_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) |
| 1352 | { |
| 1353 | struct raid_set *rs = ti->private; |
| 1354 | unsigned i; |
| 1355 | int ret = 0; |
| 1356 | |
| 1357 | for (i = 0; !ret && i < rs->md.raid_disks; i++) |
| 1358 | if (rs->dev[i].data_dev) |
| 1359 | ret = fn(ti, |
| 1360 | rs->dev[i].data_dev, |
| 1361 | 0, /* No offset on data devs */ |
| 1362 | rs->md.dev_sectors, |
| 1363 | data); |
| 1364 | |
| 1365 | return ret; |
| 1366 | } |
| 1367 | |
| 1368 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) |
| 1369 | { |
| 1370 | struct raid_set *rs = ti->private; |
| 1371 | unsigned chunk_size = rs->md.chunk_sectors << 9; |
NeilBrown | d1688a6 | 2011-10-11 16:49:52 +1100 | [diff] [blame] | 1372 | struct r5conf *conf = rs->md.private; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1373 | |
| 1374 | blk_limits_io_min(limits, chunk_size); |
| 1375 | blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); |
| 1376 | } |
| 1377 | |
| 1378 | static void raid_presuspend(struct dm_target *ti) |
| 1379 | { |
| 1380 | struct raid_set *rs = ti->private; |
| 1381 | |
| 1382 | md_stop_writes(&rs->md); |
| 1383 | } |
| 1384 | |
| 1385 | static void raid_postsuspend(struct dm_target *ti) |
| 1386 | { |
| 1387 | struct raid_set *rs = ti->private; |
| 1388 | |
| 1389 | mddev_suspend(&rs->md); |
| 1390 | } |
| 1391 | |
| 1392 | static void raid_resume(struct dm_target *ti) |
| 1393 | { |
| 1394 | struct raid_set *rs = ti->private; |
| 1395 | |
Jonathan Brassow | 81f382f | 2012-05-22 13:55:30 +1000 | [diff] [blame] | 1396 | set_bit(MD_CHANGE_DEVS, &rs->md.flags); |
Jonathan Brassow | 34f8ac6d | 2012-01-27 14:53:53 -0600 | [diff] [blame] | 1397 | if (!rs->bitmap_loaded) { |
| 1398 | bitmap_load(&rs->md); |
| 1399 | rs->bitmap_loaded = 1; |
Jonathan Brassow | 47525e5 | 2012-05-22 13:55:29 +1000 | [diff] [blame] | 1400 | } |
Jonathan Brassow | 34f8ac6d | 2012-01-27 14:53:53 -0600 | [diff] [blame] | 1401 | |
Jonathan Brassow | 47525e5 | 2012-05-22 13:55:29 +1000 | [diff] [blame] | 1402 | clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1403 | mddev_resume(&rs->md); |
| 1404 | } |
| 1405 | |
| 1406 | static struct target_type raid_target = { |
| 1407 | .name = "raid", |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1408 | .version = {1, 4, 1}, |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1409 | .module = THIS_MODULE, |
| 1410 | .ctr = raid_ctr, |
| 1411 | .dtr = raid_dtr, |
| 1412 | .map = raid_map, |
| 1413 | .status = raid_status, |
| 1414 | .iterate_devices = raid_iterate_devices, |
| 1415 | .io_hints = raid_io_hints, |
| 1416 | .presuspend = raid_presuspend, |
| 1417 | .postsuspend = raid_postsuspend, |
| 1418 | .resume = raid_resume, |
| 1419 | }; |
| 1420 | |
| 1421 | static int __init dm_raid_init(void) |
| 1422 | { |
| 1423 | return dm_register_target(&raid_target); |
| 1424 | } |
| 1425 | |
| 1426 | static void __exit dm_raid_exit(void) |
| 1427 | { |
| 1428 | dm_unregister_target(&raid_target); |
| 1429 | } |
| 1430 | |
| 1431 | module_init(dm_raid_init); |
| 1432 | module_exit(dm_raid_exit); |
| 1433 | |
| 1434 | MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 1435 | MODULE_ALIAS("dm-raid1"); |
| 1436 | MODULE_ALIAS("dm-raid10"); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1437 | MODULE_ALIAS("dm-raid4"); |
| 1438 | MODULE_ALIAS("dm-raid5"); |
| 1439 | MODULE_ALIAS("dm-raid6"); |
| 1440 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); |
| 1441 | MODULE_LICENSE("GPL"); |