NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010-2011 Neil Brown |
Heinz Mauelshagen | 75b8e04 | 2014-09-24 17:47:18 +0200 | [diff] [blame] | 3 | * Copyright (C) 2010-2014 Red Hat, Inc. All rights reserved. |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 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 | |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 21 | static bool devices_handle_discard_safely = false; |
| 22 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 23 | /* |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 24 | * The following flags are used by dm-raid.c to set up the array state. |
| 25 | * They must be cleared before md_run is called. |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 26 | */ |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 27 | #define FirstUse 10 /* rdev flag */ |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 28 | |
| 29 | struct raid_dev { |
| 30 | /* |
| 31 | * Two DM devices, one to hold metadata and one to hold the |
| 32 | * actual data/parity. The reason for this is to not confuse |
| 33 | * ti->len and give more flexibility in altering size and |
| 34 | * characteristics. |
| 35 | * |
| 36 | * While it is possible for this device to be associated |
| 37 | * with a different physical device than the data_dev, it |
| 38 | * is intended for it to be the same. |
| 39 | * |--------- Physical Device ---------| |
| 40 | * |- meta_dev -|------ data_dev ------| |
| 41 | */ |
| 42 | struct dm_dev *meta_dev; |
| 43 | struct dm_dev *data_dev; |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 44 | struct md_rdev rdev; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 45 | }; |
| 46 | |
| 47 | /* |
| 48 | * Flags for rs->print_flags field. |
| 49 | */ |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 50 | #define DMPF_SYNC 0x1 |
| 51 | #define DMPF_NOSYNC 0x2 |
| 52 | #define DMPF_REBUILD 0x4 |
| 53 | #define DMPF_DAEMON_SLEEP 0x8 |
| 54 | #define DMPF_MIN_RECOVERY_RATE 0x10 |
| 55 | #define DMPF_MAX_RECOVERY_RATE 0x20 |
| 56 | #define DMPF_MAX_WRITE_BEHIND 0x40 |
| 57 | #define DMPF_STRIPE_CACHE 0x80 |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 58 | #define DMPF_REGION_SIZE 0x100 |
| 59 | #define DMPF_RAID10_COPIES 0x200 |
| 60 | #define DMPF_RAID10_FORMAT 0x400 |
| 61 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 62 | struct raid_set { |
| 63 | struct dm_target *ti; |
| 64 | |
Jonathan Brassow | 34f8ac6d | 2012-01-27 14:53:53 -0600 | [diff] [blame] | 65 | uint32_t bitmap_loaded; |
| 66 | uint32_t print_flags; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 67 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 68 | struct mddev md; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 69 | struct raid_type *raid_type; |
| 70 | struct dm_target_callbacks callbacks; |
| 71 | |
| 72 | struct raid_dev dev[0]; |
| 73 | }; |
| 74 | |
| 75 | /* Supported raid types and properties. */ |
| 76 | static struct raid_type { |
| 77 | const char *name; /* RAID algorithm. */ |
| 78 | const char *descr; /* Descriptor text for logging. */ |
| 79 | const unsigned parity_devs; /* # of parity devices. */ |
| 80 | const unsigned minimal_devs; /* minimal # of devices in set. */ |
| 81 | const unsigned level; /* RAID level. */ |
| 82 | const unsigned algorithm; /* RAID algorithm. */ |
| 83 | } raid_types[] = { |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 84 | {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */}, |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 85 | {"raid10", "RAID10 (striped mirrors)", 0, 2, 10, UINT_MAX /* Varies */}, |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 86 | {"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, |
| 87 | {"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC}, |
| 88 | {"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC}, |
| 89 | {"raid5_ls", "RAID5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, |
| 90 | {"raid5_rs", "RAID5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, |
| 91 | {"raid6_zr", "RAID6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART}, |
| 92 | {"raid6_nr", "RAID6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART}, |
| 93 | {"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE} |
| 94 | }; |
| 95 | |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 96 | static char *raid10_md_layout_to_format(int layout) |
| 97 | { |
| 98 | /* |
| 99 | * Bit 16 and 17 stand for "offset" and "use_far_sets" |
| 100 | * Refer to MD's raid10.c for details |
| 101 | */ |
| 102 | if ((layout & 0x10000) && (layout & 0x20000)) |
| 103 | return "offset"; |
| 104 | |
| 105 | if ((layout & 0xFF) > 1) |
| 106 | return "near"; |
| 107 | |
| 108 | return "far"; |
| 109 | } |
| 110 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 111 | static unsigned raid10_md_layout_to_copies(int layout) |
| 112 | { |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 113 | if ((layout & 0xFF) > 1) |
| 114 | return layout & 0xFF; |
| 115 | return (layout >> 8) & 0xFF; |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | static int raid10_format_to_md_layout(char *format, unsigned copies) |
| 119 | { |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 120 | unsigned n = 1, f = 1; |
| 121 | |
| 122 | if (!strcmp("near", format)) |
| 123 | n = copies; |
| 124 | else |
| 125 | f = copies; |
| 126 | |
| 127 | if (!strcmp("offset", format)) |
| 128 | return 0x30000 | (f << 8) | n; |
| 129 | |
| 130 | if (!strcmp("far", format)) |
| 131 | return 0x20000 | (f << 8) | n; |
| 132 | |
| 133 | return (f << 8) | n; |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 134 | } |
| 135 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 136 | static struct raid_type *get_raid_type(char *name) |
| 137 | { |
| 138 | int i; |
| 139 | |
| 140 | for (i = 0; i < ARRAY_SIZE(raid_types); i++) |
| 141 | if (!strcmp(raid_types[i].name, name)) |
| 142 | return &raid_types[i]; |
| 143 | |
| 144 | return NULL; |
| 145 | } |
| 146 | |
| 147 | static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs) |
| 148 | { |
| 149 | unsigned i; |
| 150 | struct raid_set *rs; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 151 | |
| 152 | if (raid_devs <= raid_type->parity_devs) { |
| 153 | ti->error = "Insufficient number of devices"; |
| 154 | return ERR_PTR(-EINVAL); |
| 155 | } |
| 156 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 157 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); |
| 158 | if (!rs) { |
| 159 | ti->error = "Cannot allocate raid context"; |
| 160 | return ERR_PTR(-ENOMEM); |
| 161 | } |
| 162 | |
| 163 | mddev_init(&rs->md); |
| 164 | |
| 165 | rs->ti = ti; |
| 166 | rs->raid_type = raid_type; |
| 167 | rs->md.raid_disks = raid_devs; |
| 168 | rs->md.level = raid_type->level; |
| 169 | rs->md.new_level = rs->md.level; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 170 | rs->md.layout = raid_type->algorithm; |
| 171 | rs->md.new_layout = rs->md.layout; |
| 172 | rs->md.delta_disks = 0; |
| 173 | rs->md.recovery_cp = 0; |
| 174 | |
| 175 | for (i = 0; i < raid_devs; i++) |
| 176 | md_rdev_init(&rs->dev[i].rdev); |
| 177 | |
| 178 | /* |
| 179 | * Remaining items to be initialized by further RAID params: |
| 180 | * rs->md.persistent |
| 181 | * rs->md.external |
| 182 | * rs->md.chunk_sectors |
| 183 | * rs->md.new_chunk_sectors |
Jonathan E Brassow | c039c33 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 184 | * rs->md.dev_sectors |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 185 | */ |
| 186 | |
| 187 | return rs; |
| 188 | } |
| 189 | |
| 190 | static void context_free(struct raid_set *rs) |
| 191 | { |
| 192 | int i; |
| 193 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 194 | for (i = 0; i < rs->md.raid_disks; i++) { |
| 195 | if (rs->dev[i].meta_dev) |
| 196 | dm_put_device(rs->ti, rs->dev[i].meta_dev); |
NeilBrown | 545c879 | 2012-05-22 13:54:30 +1000 | [diff] [blame] | 197 | md_rdev_clear(&rs->dev[i].rdev); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 198 | if (rs->dev[i].data_dev) |
| 199 | dm_put_device(rs->ti, rs->dev[i].data_dev); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 200 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 201 | |
| 202 | kfree(rs); |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * For every device we have two words |
| 207 | * <meta_dev>: meta device name or '-' if missing |
| 208 | * <data_dev>: data device name or '-' if missing |
| 209 | * |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 210 | * The following are permitted: |
| 211 | * - - |
| 212 | * - <data_dev> |
| 213 | * <meta_dev> <data_dev> |
| 214 | * |
| 215 | * The following is not allowed: |
| 216 | * <meta_dev> - |
| 217 | * |
| 218 | * This code parses those words. If there is a failure, |
| 219 | * the caller must use context_free to unwind the operations. |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 220 | */ |
| 221 | static int dev_parms(struct raid_set *rs, char **argv) |
| 222 | { |
| 223 | int i; |
| 224 | int rebuild = 0; |
| 225 | int metadata_available = 0; |
| 226 | int ret = 0; |
| 227 | |
| 228 | for (i = 0; i < rs->md.raid_disks; i++, argv += 2) { |
| 229 | rs->dev[i].rdev.raid_disk = i; |
| 230 | |
| 231 | rs->dev[i].meta_dev = NULL; |
| 232 | rs->dev[i].data_dev = NULL; |
| 233 | |
| 234 | /* |
| 235 | * There are no offsets, since there is a separate device |
| 236 | * for data and metadata. |
| 237 | */ |
| 238 | rs->dev[i].rdev.data_offset = 0; |
| 239 | rs->dev[i].rdev.mddev = &rs->md; |
| 240 | |
| 241 | if (strcmp(argv[0], "-")) { |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 242 | ret = dm_get_device(rs->ti, argv[0], |
| 243 | dm_table_get_mode(rs->ti->table), |
| 244 | &rs->dev[i].meta_dev); |
| 245 | rs->ti->error = "RAID metadata device lookup failure"; |
| 246 | if (ret) |
| 247 | return ret; |
| 248 | |
| 249 | rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); |
| 250 | if (!rs->dev[i].rdev.sb_page) |
| 251 | return -ENOMEM; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | if (!strcmp(argv[1], "-")) { |
| 255 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && |
| 256 | (!rs->dev[i].rdev.recovery_offset)) { |
| 257 | rs->ti->error = "Drive designated for rebuild not specified"; |
| 258 | return -EINVAL; |
| 259 | } |
| 260 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 261 | rs->ti->error = "No data device supplied with metadata device"; |
| 262 | if (rs->dev[i].meta_dev) |
| 263 | return -EINVAL; |
| 264 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 265 | continue; |
| 266 | } |
| 267 | |
| 268 | ret = dm_get_device(rs->ti, argv[1], |
| 269 | dm_table_get_mode(rs->ti->table), |
| 270 | &rs->dev[i].data_dev); |
| 271 | if (ret) { |
| 272 | rs->ti->error = "RAID device lookup failure"; |
| 273 | return ret; |
| 274 | } |
| 275 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 276 | if (rs->dev[i].meta_dev) { |
| 277 | metadata_available = 1; |
| 278 | rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; |
| 279 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 280 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
| 281 | list_add(&rs->dev[i].rdev.same_set, &rs->md.disks); |
| 282 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 283 | rebuild++; |
| 284 | } |
| 285 | |
| 286 | if (metadata_available) { |
| 287 | rs->md.external = 0; |
| 288 | rs->md.persistent = 1; |
| 289 | rs->md.major_version = 2; |
| 290 | } else if (rebuild && !rs->md.recovery_cp) { |
| 291 | /* |
| 292 | * Without metadata, we will not be able to tell if the array |
| 293 | * is in-sync or not - we must assume it is not. Therefore, |
| 294 | * it is impossible to rebuild a drive. |
| 295 | * |
| 296 | * Even if there is metadata, the on-disk information may |
| 297 | * indicate that the array is not in-sync and it will then |
| 298 | * fail at that time. |
| 299 | * |
| 300 | * User could specify 'nosync' option if desperate. |
| 301 | */ |
| 302 | DMERR("Unable to rebuild drive while array is not in-sync"); |
| 303 | rs->ti->error = "RAID device lookup failure"; |
| 304 | return -EINVAL; |
| 305 | } |
| 306 | |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | /* |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 311 | * validate_region_size |
| 312 | * @rs |
| 313 | * @region_size: region size in sectors. If 0, pick a size (4MiB default). |
| 314 | * |
| 315 | * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). |
| 316 | * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. |
| 317 | * |
| 318 | * Returns: 0 on success, -EINVAL on failure. |
| 319 | */ |
| 320 | static int validate_region_size(struct raid_set *rs, unsigned long region_size) |
| 321 | { |
| 322 | unsigned long min_region_size = rs->ti->len / (1 << 21); |
| 323 | |
| 324 | if (!region_size) { |
| 325 | /* |
| 326 | * Choose a reasonable default. All figures in sectors. |
| 327 | */ |
| 328 | if (min_region_size > (1 << 13)) { |
Jonathan Brassow | 3a0f9aa | 2012-12-21 20:23:33 +0000 | [diff] [blame] | 329 | /* If not a power of 2, make it the next power of 2 */ |
| 330 | if (min_region_size & (min_region_size - 1)) |
| 331 | region_size = 1 << fls(region_size); |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 332 | DMINFO("Choosing default region size of %lu sectors", |
| 333 | region_size); |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 334 | } else { |
| 335 | DMINFO("Choosing default region size of 4MiB"); |
| 336 | region_size = 1 << 13; /* sectors */ |
| 337 | } |
| 338 | } else { |
| 339 | /* |
| 340 | * Validate user-supplied value. |
| 341 | */ |
| 342 | if (region_size > rs->ti->len) { |
| 343 | rs->ti->error = "Supplied region size is too large"; |
| 344 | return -EINVAL; |
| 345 | } |
| 346 | |
| 347 | if (region_size < min_region_size) { |
| 348 | DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", |
| 349 | region_size, min_region_size); |
| 350 | rs->ti->error = "Supplied region size is too small"; |
| 351 | return -EINVAL; |
| 352 | } |
| 353 | |
| 354 | if (!is_power_of_2(region_size)) { |
| 355 | rs->ti->error = "Region size is not a power of 2"; |
| 356 | return -EINVAL; |
| 357 | } |
| 358 | |
| 359 | if (region_size < rs->md.chunk_sectors) { |
| 360 | rs->ti->error = "Region size is smaller than the chunk size"; |
| 361 | return -EINVAL; |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | /* |
| 366 | * Convert sectors to bytes. |
| 367 | */ |
| 368 | rs->md.bitmap_info.chunksize = (region_size << 9); |
| 369 | |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | /* |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 374 | * validate_raid_redundancy |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 375 | * @rs |
| 376 | * |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 377 | * Determine if there are enough devices in the array that haven't |
| 378 | * failed (or are being rebuilt) to form a usable array. |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 379 | * |
| 380 | * Returns: 0 on success, -EINVAL on failure. |
| 381 | */ |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 382 | static int validate_raid_redundancy(struct raid_set *rs) |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 383 | { |
| 384 | unsigned i, rebuild_cnt = 0; |
NeilBrown | 3f6bbd3 | 2013-05-09 10:27:49 +1000 | [diff] [blame] | 385 | unsigned rebuilds_per_group = 0, copies, d; |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 386 | unsigned group_size, last_group_start; |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 387 | |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 388 | for (i = 0; i < rs->md.raid_disks; i++) |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 389 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || |
| 390 | !rs->dev[i].rdev.sb_page) |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 391 | rebuild_cnt++; |
| 392 | |
| 393 | switch (rs->raid_type->level) { |
| 394 | case 1: |
| 395 | if (rebuild_cnt >= rs->md.raid_disks) |
| 396 | goto too_many; |
| 397 | break; |
| 398 | case 4: |
| 399 | case 5: |
| 400 | case 6: |
| 401 | if (rebuild_cnt > rs->raid_type->parity_devs) |
| 402 | goto too_many; |
| 403 | break; |
| 404 | case 10: |
Jonathan Brassow | 4ec1e36 | 2012-10-11 13:40:24 +1100 | [diff] [blame] | 405 | copies = raid10_md_layout_to_copies(rs->md.layout); |
| 406 | if (rebuild_cnt < copies) |
| 407 | break; |
| 408 | |
| 409 | /* |
| 410 | * It is possible to have a higher rebuild count for RAID10, |
| 411 | * as long as the failed devices occur in different mirror |
| 412 | * groups (i.e. different stripes). |
| 413 | * |
Jonathan Brassow | 4ec1e36 | 2012-10-11 13:40:24 +1100 | [diff] [blame] | 414 | * When checking "near" format, make sure no adjacent devices |
| 415 | * have failed beyond what can be handled. In addition to the |
| 416 | * simple case where the number of devices is a multiple of the |
| 417 | * number of copies, we must also handle cases where the number |
| 418 | * of devices is not a multiple of the number of copies. |
| 419 | * E.g. dev1 dev2 dev3 dev4 dev5 |
| 420 | * A A B B C |
| 421 | * C D D E E |
| 422 | */ |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 423 | if (!strcmp("near", raid10_md_layout_to_format(rs->md.layout))) { |
| 424 | for (i = 0; i < rs->md.raid_disks * copies; i++) { |
| 425 | if (!(i % copies)) |
| 426 | rebuilds_per_group = 0; |
| 427 | d = i % rs->md.raid_disks; |
| 428 | if ((!rs->dev[d].rdev.sb_page || |
| 429 | !test_bit(In_sync, &rs->dev[d].rdev.flags)) && |
| 430 | (++rebuilds_per_group >= copies)) |
| 431 | goto too_many; |
| 432 | } |
| 433 | break; |
| 434 | } |
| 435 | |
| 436 | /* |
| 437 | * When checking "far" and "offset" formats, we need to ensure |
| 438 | * that the device that holds its copy is not also dead or |
| 439 | * being rebuilt. (Note that "far" and "offset" formats only |
| 440 | * support two copies right now. These formats also only ever |
| 441 | * use the 'use_far_sets' variant.) |
| 442 | * |
| 443 | * This check is somewhat complicated by the need to account |
| 444 | * for arrays that are not a multiple of (far) copies. This |
| 445 | * results in the need to treat the last (potentially larger) |
| 446 | * set differently. |
| 447 | */ |
| 448 | group_size = (rs->md.raid_disks / copies); |
| 449 | last_group_start = (rs->md.raid_disks / group_size) - 1; |
| 450 | last_group_start *= group_size; |
| 451 | for (i = 0; i < rs->md.raid_disks; i++) { |
| 452 | if (!(i % copies) && !(i > last_group_start)) |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 453 | rebuilds_per_group = 0; |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 454 | if ((!rs->dev[i].rdev.sb_page || |
| 455 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) && |
Jonathan Brassow | 4ec1e36 | 2012-10-11 13:40:24 +1100 | [diff] [blame] | 456 | (++rebuilds_per_group >= copies)) |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 457 | goto too_many; |
Jonathan Brassow | 4ec1e36 | 2012-10-11 13:40:24 +1100 | [diff] [blame] | 458 | } |
| 459 | break; |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 460 | default: |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 461 | if (rebuild_cnt) |
| 462 | return -EINVAL; |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | return 0; |
| 466 | |
| 467 | too_many: |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 468 | return -EINVAL; |
| 469 | } |
| 470 | |
| 471 | /* |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 472 | * Possible arguments are... |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 473 | * <chunk_size> [optional_args] |
| 474 | * |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 475 | * Argument definitions |
| 476 | * <chunk_size> The number of sectors per disk that |
| 477 | * will form the "stripe" |
| 478 | * [[no]sync] Force or prevent recovery of the |
| 479 | * entire array |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 480 | * [devices_handle_discard_safely] Allow discards on RAID4/5/6; useful if RAID |
| 481 | * member device(s) properly support TRIM/UNMAP |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 482 | * [rebuild <idx>] Rebuild the drive indicated by the index |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 483 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
| 484 | * clear bits |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 485 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
| 486 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 487 | * [write_mostly <idx>] Indicate a write mostly drive via index |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 488 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
| 489 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 490 | * [region_size <sectors>] Defines granularity of bitmap |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 491 | * |
| 492 | * RAID10-only options: |
| 493 | * [raid10_copies <# copies>] Number of copies. (Default: 2) |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 494 | * [raid10_format <near|far|offset>] Layout algorithm. (Default: near) |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 495 | */ |
| 496 | static int parse_raid_params(struct raid_set *rs, char **argv, |
| 497 | unsigned num_raid_params) |
| 498 | { |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 499 | char *raid10_format = "near"; |
| 500 | unsigned raid10_copies = 2; |
Jonathan Brassow | eb64912 | 2012-10-11 13:40:09 +1100 | [diff] [blame] | 501 | unsigned i; |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 502 | unsigned long value, region_size = 0; |
Jonathan E Brassow | c039c33 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 503 | sector_t sectors_per_dev = rs->ti->len; |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 504 | sector_t max_io_len; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 505 | char *key; |
| 506 | |
| 507 | /* |
| 508 | * First, parse the in-order required arguments |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 509 | * "chunk_size" is the only argument of this type. |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 510 | */ |
Jingoo Han | b29bebd | 2013-06-01 16:15:16 +0900 | [diff] [blame] | 511 | if ((kstrtoul(argv[0], 10, &value) < 0)) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 512 | rs->ti->error = "Bad chunk size"; |
| 513 | return -EINVAL; |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 514 | } else if (rs->raid_type->level == 1) { |
| 515 | if (value) |
| 516 | DMERR("Ignoring chunk size parameter for RAID 1"); |
| 517 | value = 0; |
| 518 | } else if (!is_power_of_2(value)) { |
| 519 | rs->ti->error = "Chunk size must be a power of 2"; |
| 520 | return -EINVAL; |
| 521 | } else if (value < 8) { |
| 522 | rs->ti->error = "Chunk size value is too small"; |
| 523 | return -EINVAL; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 524 | } |
| 525 | |
| 526 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; |
| 527 | argv++; |
| 528 | num_raid_params--; |
| 529 | |
| 530 | /* |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 531 | * We set each individual device as In_sync with a completed |
| 532 | * 'recovery_offset'. If there has been a device failure or |
| 533 | * replacement then one of the following cases applies: |
| 534 | * |
| 535 | * 1) User specifies 'rebuild'. |
| 536 | * - Device is reset when param is read. |
| 537 | * 2) A new device is supplied. |
| 538 | * - No matching superblock found, resets device. |
| 539 | * 3) Device failure was transient and returns on reload. |
| 540 | * - Failure noticed, resets device for bitmap replay. |
| 541 | * 4) Device hadn't completed recovery after previous failure. |
| 542 | * - Superblock is read and overrides recovery_offset. |
| 543 | * |
| 544 | * What is found in the superblocks of the devices is always |
| 545 | * authoritative, unless 'rebuild' or '[no]sync' was specified. |
| 546 | */ |
| 547 | for (i = 0; i < rs->md.raid_disks; i++) { |
| 548 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
| 549 | rs->dev[i].rdev.recovery_offset = MaxSector; |
| 550 | } |
| 551 | |
| 552 | /* |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 553 | * Second, parse the unordered optional arguments |
| 554 | */ |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 555 | for (i = 0; i < num_raid_params; i++) { |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 556 | if (!strcasecmp(argv[i], "nosync")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 557 | rs->md.recovery_cp = MaxSector; |
| 558 | rs->print_flags |= DMPF_NOSYNC; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 559 | continue; |
| 560 | } |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 561 | if (!strcasecmp(argv[i], "sync")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 562 | rs->md.recovery_cp = 0; |
| 563 | rs->print_flags |= DMPF_SYNC; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 564 | continue; |
| 565 | } |
| 566 | |
| 567 | /* The rest of the optional arguments come in key/value pairs */ |
| 568 | if ((i + 1) >= num_raid_params) { |
| 569 | rs->ti->error = "Wrong number of raid parameters given"; |
| 570 | return -EINVAL; |
| 571 | } |
| 572 | |
| 573 | key = argv[i++]; |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 574 | |
| 575 | /* Parameters that take a string value are checked here. */ |
| 576 | if (!strcasecmp(key, "raid10_format")) { |
| 577 | if (rs->raid_type->level != 10) { |
| 578 | rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type"; |
| 579 | return -EINVAL; |
| 580 | } |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 581 | if (strcmp("near", argv[i]) && |
| 582 | strcmp("far", argv[i]) && |
| 583 | strcmp("offset", argv[i])) { |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 584 | rs->ti->error = "Invalid 'raid10_format' value given"; |
| 585 | return -EINVAL; |
| 586 | } |
| 587 | raid10_format = argv[i]; |
| 588 | rs->print_flags |= DMPF_RAID10_FORMAT; |
| 589 | continue; |
| 590 | } |
| 591 | |
Jingoo Han | b29bebd | 2013-06-01 16:15:16 +0900 | [diff] [blame] | 592 | if (kstrtoul(argv[i], 10, &value) < 0) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 593 | rs->ti->error = "Bad numerical argument given in raid params"; |
| 594 | return -EINVAL; |
| 595 | } |
| 596 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 597 | /* Parameters that take a numeric value are checked here */ |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 598 | if (!strcasecmp(key, "rebuild")) { |
Jonathan Brassow | 7386199 | 2012-10-11 13:40:36 +1100 | [diff] [blame] | 599 | if (value >= rs->md.raid_disks) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 600 | rs->ti->error = "Invalid rebuild index given"; |
| 601 | return -EINVAL; |
| 602 | } |
| 603 | clear_bit(In_sync, &rs->dev[value].rdev.flags); |
| 604 | rs->dev[value].rdev.recovery_offset = 0; |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 605 | rs->print_flags |= DMPF_REBUILD; |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 606 | } else if (!strcasecmp(key, "write_mostly")) { |
| 607 | if (rs->raid_type->level != 1) { |
| 608 | rs->ti->error = "write_mostly option is only valid for RAID1"; |
| 609 | return -EINVAL; |
| 610 | } |
Jonthan Brassow | 8232480 | 2011-09-25 23:26:19 +0100 | [diff] [blame] | 611 | if (value >= rs->md.raid_disks) { |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 612 | rs->ti->error = "Invalid write_mostly drive index given"; |
| 613 | return -EINVAL; |
| 614 | } |
| 615 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 616 | } else if (!strcasecmp(key, "max_write_behind")) { |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 617 | if (rs->raid_type->level != 1) { |
| 618 | rs->ti->error = "max_write_behind option is only valid for RAID1"; |
| 619 | return -EINVAL; |
| 620 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 621 | rs->print_flags |= DMPF_MAX_WRITE_BEHIND; |
| 622 | |
| 623 | /* |
| 624 | * In device-mapper, we specify things in sectors, but |
| 625 | * MD records this value in kB |
| 626 | */ |
| 627 | value /= 2; |
| 628 | if (value > COUNTER_MAX) { |
| 629 | rs->ti->error = "Max write-behind limit out of range"; |
| 630 | return -EINVAL; |
| 631 | } |
| 632 | rs->md.bitmap_info.max_write_behind = value; |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 633 | } else if (!strcasecmp(key, "daemon_sleep")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 634 | rs->print_flags |= DMPF_DAEMON_SLEEP; |
| 635 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) { |
| 636 | rs->ti->error = "daemon sleep period out of range"; |
| 637 | return -EINVAL; |
| 638 | } |
| 639 | rs->md.bitmap_info.daemon_sleep = value; |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 640 | } else if (!strcasecmp(key, "stripe_cache")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 641 | rs->print_flags |= DMPF_STRIPE_CACHE; |
| 642 | |
| 643 | /* |
| 644 | * In device-mapper, we specify things in sectors, but |
| 645 | * MD records this value in kB |
| 646 | */ |
| 647 | value /= 2; |
| 648 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 649 | if ((rs->raid_type->level != 5) && |
| 650 | (rs->raid_type->level != 6)) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 651 | rs->ti->error = "Inappropriate argument: stripe_cache"; |
| 652 | return -EINVAL; |
| 653 | } |
| 654 | if (raid5_set_cache_size(&rs->md, (int)value)) { |
| 655 | rs->ti->error = "Bad stripe_cache size"; |
| 656 | return -EINVAL; |
| 657 | } |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 658 | } else if (!strcasecmp(key, "min_recovery_rate")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 659 | rs->print_flags |= DMPF_MIN_RECOVERY_RATE; |
| 660 | if (value > INT_MAX) { |
| 661 | rs->ti->error = "min_recovery_rate out of range"; |
| 662 | return -EINVAL; |
| 663 | } |
| 664 | rs->md.sync_speed_min = (int)value; |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 665 | } else if (!strcasecmp(key, "max_recovery_rate")) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 666 | rs->print_flags |= DMPF_MAX_RECOVERY_RATE; |
| 667 | if (value > INT_MAX) { |
| 668 | rs->ti->error = "max_recovery_rate out of range"; |
| 669 | return -EINVAL; |
| 670 | } |
| 671 | rs->md.sync_speed_max = (int)value; |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 672 | } else if (!strcasecmp(key, "region_size")) { |
| 673 | rs->print_flags |= DMPF_REGION_SIZE; |
| 674 | region_size = value; |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 675 | } else if (!strcasecmp(key, "raid10_copies") && |
| 676 | (rs->raid_type->level == 10)) { |
| 677 | if ((value < 2) || (value > 0xFF)) { |
| 678 | rs->ti->error = "Bad value for 'raid10_copies'"; |
| 679 | return -EINVAL; |
| 680 | } |
| 681 | rs->print_flags |= DMPF_RAID10_COPIES; |
| 682 | raid10_copies = value; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 683 | } else { |
| 684 | DMERR("Unable to parse RAID parameter: %s", key); |
| 685 | rs->ti->error = "Unable to parse RAID parameters"; |
| 686 | return -EINVAL; |
| 687 | } |
| 688 | } |
| 689 | |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 690 | if (validate_region_size(rs, region_size)) |
| 691 | return -EINVAL; |
| 692 | |
| 693 | if (rs->md.chunk_sectors) |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 694 | max_io_len = rs->md.chunk_sectors; |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 695 | else |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 696 | max_io_len = region_size; |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 697 | |
Mike Snitzer | 542f903 | 2012-07-27 15:08:00 +0100 | [diff] [blame] | 698 | if (dm_set_target_max_io_len(rs->ti, max_io_len)) |
| 699 | return -EINVAL; |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 700 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 701 | if (rs->raid_type->level == 10) { |
| 702 | if (raid10_copies > rs->md.raid_disks) { |
| 703 | rs->ti->error = "Not enough devices to satisfy specification"; |
| 704 | return -EINVAL; |
| 705 | } |
| 706 | |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 707 | /* |
| 708 | * If the format is not "near", we only support |
| 709 | * two copies at the moment. |
| 710 | */ |
| 711 | if (strcmp("near", raid10_format) && (raid10_copies > 2)) { |
| 712 | rs->ti->error = "Too many copies for given RAID10 format."; |
| 713 | return -EINVAL; |
| 714 | } |
| 715 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 716 | /* (Len * #mirrors) / #devices */ |
| 717 | sectors_per_dev = rs->ti->len * raid10_copies; |
| 718 | sector_div(sectors_per_dev, rs->md.raid_disks); |
| 719 | |
| 720 | rs->md.layout = raid10_format_to_md_layout(raid10_format, |
| 721 | raid10_copies); |
| 722 | rs->md.new_layout = rs->md.layout; |
| 723 | } else if ((rs->raid_type->level > 1) && |
| 724 | sector_div(sectors_per_dev, |
| 725 | (rs->md.raid_disks - rs->raid_type->parity_devs))) { |
Jonathan E Brassow | c039c33 | 2012-07-27 15:08:04 +0100 | [diff] [blame] | 726 | rs->ti->error = "Target length not divisible by number of data devices"; |
| 727 | return -EINVAL; |
| 728 | } |
| 729 | rs->md.dev_sectors = sectors_per_dev; |
| 730 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 731 | /* Assume there are no metadata devices until the drives are parsed */ |
| 732 | rs->md.persistent = 0; |
| 733 | rs->md.external = 1; |
| 734 | |
| 735 | return 0; |
| 736 | } |
| 737 | |
| 738 | static void do_table_event(struct work_struct *ws) |
| 739 | { |
| 740 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); |
| 741 | |
| 742 | dm_table_event(rs->ti->table); |
| 743 | } |
| 744 | |
| 745 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) |
| 746 | { |
| 747 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); |
| 748 | |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 749 | if (rs->raid_type->level == 1) |
| 750 | return md_raid1_congested(&rs->md, bits); |
| 751 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 752 | if (rs->raid_type->level == 10) |
| 753 | return md_raid10_congested(&rs->md, bits); |
| 754 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 755 | return md_raid5_congested(&rs->md, bits); |
| 756 | } |
| 757 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 758 | /* |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 759 | * This structure is never routinely used by userspace, unlike md superblocks. |
| 760 | * Devices with this superblock should only ever be accessed via device-mapper. |
| 761 | */ |
| 762 | #define DM_RAID_MAGIC 0x64526D44 |
| 763 | struct dm_raid_superblock { |
| 764 | __le32 magic; /* "DmRd" */ |
| 765 | __le32 features; /* Used to indicate possible future changes */ |
| 766 | |
| 767 | __le32 num_devices; /* Number of devices in this array. (Max 64) */ |
| 768 | __le32 array_position; /* The position of this drive in the array */ |
| 769 | |
| 770 | __le64 events; /* Incremented by md when superblock updated */ |
| 771 | __le64 failed_devices; /* Bit field of devices to indicate failures */ |
| 772 | |
| 773 | /* |
| 774 | * This offset tracks the progress of the repair or replacement of |
| 775 | * an individual drive. |
| 776 | */ |
| 777 | __le64 disk_recovery_offset; |
| 778 | |
| 779 | /* |
| 780 | * This offset tracks the progress of the initial array |
| 781 | * synchronisation/parity calculation. |
| 782 | */ |
| 783 | __le64 array_resync_offset; |
| 784 | |
| 785 | /* |
| 786 | * RAID characteristics |
| 787 | */ |
| 788 | __le32 level; |
| 789 | __le32 layout; |
| 790 | __le32 stripe_sectors; |
| 791 | |
Heinz Mauelshagen | 40d43c4 | 2014-10-17 13:38:50 +0200 | [diff] [blame] | 792 | /* Remainder of a logical block is zero-filled when writing (see super_sync()). */ |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 793 | } __packed; |
| 794 | |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 795 | static int read_disk_sb(struct md_rdev *rdev, int size) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 796 | { |
| 797 | BUG_ON(!rdev->sb_page); |
| 798 | |
| 799 | if (rdev->sb_loaded) |
| 800 | return 0; |
| 801 | |
| 802 | 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] | 803 | DMERR("Failed to read superblock of device at position %d", |
| 804 | rdev->raid_disk); |
Jonathan Brassow | c32fb9e | 2012-05-22 13:55:31 +1000 | [diff] [blame] | 805 | md_error(rdev->mddev, rdev); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 806 | return -EINVAL; |
| 807 | } |
| 808 | |
| 809 | rdev->sb_loaded = 1; |
| 810 | |
| 811 | return 0; |
| 812 | } |
| 813 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 814 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 815 | { |
Jonathan Brassow | 81f382f | 2012-05-22 13:55:30 +1000 | [diff] [blame] | 816 | int i; |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 817 | uint64_t failed_devices; |
| 818 | struct dm_raid_superblock *sb; |
Jonathan Brassow | 81f382f | 2012-05-22 13:55:30 +1000 | [diff] [blame] | 819 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 820 | |
| 821 | sb = page_address(rdev->sb_page); |
| 822 | failed_devices = le64_to_cpu(sb->failed_devices); |
| 823 | |
Jonathan Brassow | 81f382f | 2012-05-22 13:55:30 +1000 | [diff] [blame] | 824 | for (i = 0; i < mddev->raid_disks; i++) |
| 825 | if (!rs->dev[i].data_dev || |
| 826 | test_bit(Faulty, &(rs->dev[i].rdev.flags))) |
| 827 | failed_devices |= (1ULL << i); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 828 | |
Heinz Mauelshagen | 40d43c4 | 2014-10-17 13:38:50 +0200 | [diff] [blame] | 829 | memset(sb + 1, 0, rdev->sb_size - sizeof(*sb)); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 830 | |
| 831 | sb->magic = cpu_to_le32(DM_RAID_MAGIC); |
| 832 | sb->features = cpu_to_le32(0); /* No features yet */ |
| 833 | |
| 834 | sb->num_devices = cpu_to_le32(mddev->raid_disks); |
| 835 | sb->array_position = cpu_to_le32(rdev->raid_disk); |
| 836 | |
| 837 | sb->events = cpu_to_le64(mddev->events); |
| 838 | sb->failed_devices = cpu_to_le64(failed_devices); |
| 839 | |
| 840 | sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); |
| 841 | sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); |
| 842 | |
| 843 | sb->level = cpu_to_le32(mddev->level); |
| 844 | sb->layout = cpu_to_le32(mddev->layout); |
| 845 | sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); |
| 846 | } |
| 847 | |
| 848 | /* |
| 849 | * super_load |
| 850 | * |
| 851 | * This function creates a superblock if one is not found on the device |
| 852 | * and will decide which superblock to use if there's a choice. |
| 853 | * |
| 854 | * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise |
| 855 | */ |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 856 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 857 | { |
| 858 | int ret; |
| 859 | struct dm_raid_superblock *sb; |
| 860 | struct dm_raid_superblock *refsb; |
| 861 | uint64_t events_sb, events_refsb; |
| 862 | |
| 863 | rdev->sb_start = 0; |
Heinz Mauelshagen | 40d43c4 | 2014-10-17 13:38:50 +0200 | [diff] [blame] | 864 | rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev); |
| 865 | if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) { |
| 866 | DMERR("superblock size of a logical block is no longer valid"); |
| 867 | return -EINVAL; |
| 868 | } |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 869 | |
| 870 | ret = read_disk_sb(rdev, rdev->sb_size); |
| 871 | if (ret) |
| 872 | return ret; |
| 873 | |
| 874 | sb = page_address(rdev->sb_page); |
Jonathan E Brassow | 3aa3b2b | 2012-03-07 19:09:47 +0000 | [diff] [blame] | 875 | |
| 876 | /* |
| 877 | * Two cases that we want to write new superblocks and rebuild: |
| 878 | * 1) New device (no matching magic number) |
| 879 | * 2) Device specified for rebuild (!In_sync w/ offset == 0) |
| 880 | */ |
| 881 | if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) || |
| 882 | (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) { |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 883 | super_sync(rdev->mddev, rdev); |
| 884 | |
| 885 | set_bit(FirstUse, &rdev->flags); |
| 886 | |
| 887 | /* Force writing of superblocks to disk */ |
| 888 | set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags); |
| 889 | |
| 890 | /* Any superblock is better than none, choose that if given */ |
| 891 | return refdev ? 0 : 1; |
| 892 | } |
| 893 | |
| 894 | if (!refdev) |
| 895 | return 1; |
| 896 | |
| 897 | events_sb = le64_to_cpu(sb->events); |
| 898 | |
| 899 | refsb = page_address(refdev->sb_page); |
| 900 | events_refsb = le64_to_cpu(refsb->events); |
| 901 | |
| 902 | return (events_sb > events_refsb) ? 1 : 0; |
| 903 | } |
| 904 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 905 | static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 906 | { |
| 907 | int role; |
| 908 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
| 909 | uint64_t events_sb; |
| 910 | uint64_t failed_devices; |
| 911 | struct dm_raid_superblock *sb; |
| 912 | uint32_t new_devs = 0; |
| 913 | uint32_t rebuilds = 0; |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 914 | struct md_rdev *r; |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 915 | struct dm_raid_superblock *sb2; |
| 916 | |
| 917 | sb = page_address(rdev->sb_page); |
| 918 | events_sb = le64_to_cpu(sb->events); |
| 919 | failed_devices = le64_to_cpu(sb->failed_devices); |
| 920 | |
| 921 | /* |
| 922 | * Initialise to 1 if this is a new superblock. |
| 923 | */ |
| 924 | mddev->events = events_sb ? : 1; |
| 925 | |
| 926 | /* |
| 927 | * Reshaping is not currently allowed |
| 928 | */ |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 929 | if (le32_to_cpu(sb->level) != mddev->level) { |
| 930 | DMERR("Reshaping arrays not yet supported. (RAID level change)"); |
| 931 | return -EINVAL; |
| 932 | } |
| 933 | if (le32_to_cpu(sb->layout) != mddev->layout) { |
| 934 | DMERR("Reshaping arrays not yet supported. (RAID layout change)"); |
| 935 | DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout); |
| 936 | DMERR(" Old layout: %s w/ %d copies", |
| 937 | raid10_md_layout_to_format(le32_to_cpu(sb->layout)), |
| 938 | raid10_md_layout_to_copies(le32_to_cpu(sb->layout))); |
| 939 | DMERR(" New layout: %s w/ %d copies", |
| 940 | raid10_md_layout_to_format(mddev->layout), |
| 941 | raid10_md_layout_to_copies(mddev->layout)); |
| 942 | return -EINVAL; |
| 943 | } |
| 944 | if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) { |
| 945 | DMERR("Reshaping arrays not yet supported. (stripe sectors change)"); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 946 | return -EINVAL; |
| 947 | } |
| 948 | |
| 949 | /* We can only change the number of devices in RAID1 right now */ |
| 950 | if ((rs->raid_type->level != 1) && |
| 951 | (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) { |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 952 | DMERR("Reshaping arrays not yet supported. (device count change)"); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 953 | return -EINVAL; |
| 954 | } |
| 955 | |
| 956 | if (!(rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))) |
| 957 | mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); |
| 958 | |
| 959 | /* |
| 960 | * During load, we set FirstUse if a new superblock was written. |
| 961 | * There are two reasons we might not have a superblock: |
| 962 | * 1) The array is brand new - in which case, all of the |
| 963 | * devices must have their In_sync bit set. Also, |
| 964 | * recovery_cp must be 0, unless forced. |
| 965 | * 2) This is a new device being added to an old array |
| 966 | * and the new device needs to be rebuilt - in which |
| 967 | * case the In_sync bit will /not/ be set and |
| 968 | * recovery_cp must be MaxSector. |
| 969 | */ |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 970 | rdev_for_each(r, mddev) { |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 971 | if (!test_bit(In_sync, &r->flags)) { |
Jonathan E Brassow | 3aa3b2b | 2012-03-07 19:09:47 +0000 | [diff] [blame] | 972 | DMINFO("Device %d specified for rebuild: " |
| 973 | "Clearing superblock", r->raid_disk); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 974 | rebuilds++; |
| 975 | } else if (test_bit(FirstUse, &r->flags)) |
| 976 | new_devs++; |
| 977 | } |
| 978 | |
| 979 | if (!rebuilds) { |
| 980 | if (new_devs == mddev->raid_disks) { |
| 981 | DMINFO("Superblocks created for new array"); |
| 982 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); |
| 983 | } else if (new_devs) { |
| 984 | DMERR("New device injected " |
| 985 | "into existing array without 'rebuild' " |
| 986 | "parameter specified"); |
| 987 | return -EINVAL; |
| 988 | } |
| 989 | } else if (new_devs) { |
| 990 | DMERR("'rebuild' devices cannot be " |
| 991 | "injected into an array with other first-time devices"); |
| 992 | return -EINVAL; |
| 993 | } else if (mddev->recovery_cp != MaxSector) { |
| 994 | DMERR("'rebuild' specified while array is not in-sync"); |
| 995 | return -EINVAL; |
| 996 | } |
| 997 | |
| 998 | /* |
| 999 | * Now we set the Faulty bit for those devices that are |
| 1000 | * recorded in the superblock as failed. |
| 1001 | */ |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 1002 | rdev_for_each(r, mddev) { |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1003 | if (!r->sb_page) |
| 1004 | continue; |
| 1005 | sb2 = page_address(r->sb_page); |
| 1006 | sb2->failed_devices = 0; |
| 1007 | |
| 1008 | /* |
| 1009 | * Check for any device re-ordering. |
| 1010 | */ |
| 1011 | if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) { |
| 1012 | role = le32_to_cpu(sb2->array_position); |
| 1013 | if (role != r->raid_disk) { |
| 1014 | if (rs->raid_type->level != 1) { |
| 1015 | rs->ti->error = "Cannot change device " |
| 1016 | "positions in RAID array"; |
| 1017 | return -EINVAL; |
| 1018 | } |
| 1019 | DMINFO("RAID1 device #%d now at position #%d", |
| 1020 | role, r->raid_disk); |
| 1021 | } |
| 1022 | |
| 1023 | /* |
| 1024 | * Partial recovery is performed on |
| 1025 | * returning failed devices. |
| 1026 | */ |
| 1027 | if (failed_devices & (1 << role)) |
| 1028 | set_bit(Faulty, &r->flags); |
| 1029 | } |
| 1030 | } |
| 1031 | |
| 1032 | return 0; |
| 1033 | } |
| 1034 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1035 | static int super_validate(struct mddev *mddev, struct md_rdev *rdev) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1036 | { |
| 1037 | struct dm_raid_superblock *sb = page_address(rdev->sb_page); |
| 1038 | |
| 1039 | /* |
| 1040 | * If mddev->events is not set, we know we have not yet initialized |
| 1041 | * the array. |
| 1042 | */ |
| 1043 | if (!mddev->events && super_init_validation(mddev, rdev)) |
| 1044 | return -EINVAL; |
| 1045 | |
| 1046 | mddev->bitmap_info.offset = 4096 >> 9; /* Enable bitmap creation */ |
| 1047 | rdev->mddev->bitmap_info.default_offset = 4096 >> 9; |
| 1048 | if (!test_bit(FirstUse, &rdev->flags)) { |
| 1049 | rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); |
| 1050 | if (rdev->recovery_offset != MaxSector) |
| 1051 | clear_bit(In_sync, &rdev->flags); |
| 1052 | } |
| 1053 | |
| 1054 | /* |
| 1055 | * If a device comes back, set it as not In_sync and no longer faulty. |
| 1056 | */ |
| 1057 | if (test_bit(Faulty, &rdev->flags)) { |
| 1058 | clear_bit(Faulty, &rdev->flags); |
| 1059 | clear_bit(In_sync, &rdev->flags); |
| 1060 | rdev->saved_raid_disk = rdev->raid_disk; |
| 1061 | rdev->recovery_offset = 0; |
| 1062 | } |
| 1063 | |
| 1064 | clear_bit(FirstUse, &rdev->flags); |
| 1065 | |
| 1066 | return 0; |
| 1067 | } |
| 1068 | |
| 1069 | /* |
| 1070 | * Analyse superblocks and select the freshest. |
| 1071 | */ |
| 1072 | static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) |
| 1073 | { |
| 1074 | int ret; |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1075 | struct raid_dev *dev; |
Jonathan Brassow | a9ad852 | 2012-04-24 10:23:13 +1000 | [diff] [blame] | 1076 | struct md_rdev *rdev, *tmp, *freshest; |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1077 | struct mddev *mddev = &rs->md; |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1078 | |
| 1079 | freshest = NULL; |
Jonathan Brassow | a9ad852 | 2012-04-24 10:23:13 +1000 | [diff] [blame] | 1080 | rdev_for_each_safe(rdev, tmp, mddev) { |
Jonathan Brassow | 761becf | 2012-10-11 13:42:19 +1100 | [diff] [blame] | 1081 | /* |
| 1082 | * Skipping super_load due to DMPF_SYNC will cause |
| 1083 | * the array to undergo initialization again as |
| 1084 | * though it were new. This is the intended effect |
| 1085 | * of the "sync" directive. |
| 1086 | * |
| 1087 | * When reshaping capability is added, we must ensure |
| 1088 | * that the "sync" directive is disallowed during the |
| 1089 | * reshape. |
| 1090 | */ |
| 1091 | if (rs->print_flags & DMPF_SYNC) |
| 1092 | continue; |
| 1093 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1094 | if (!rdev->meta_bdev) |
| 1095 | continue; |
| 1096 | |
| 1097 | ret = super_load(rdev, freshest); |
| 1098 | |
| 1099 | switch (ret) { |
| 1100 | case 1: |
| 1101 | freshest = rdev; |
| 1102 | break; |
| 1103 | case 0: |
| 1104 | break; |
| 1105 | default: |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1106 | dev = container_of(rdev, struct raid_dev, rdev); |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1107 | if (dev->meta_dev) |
| 1108 | dm_put_device(ti, dev->meta_dev); |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1109 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1110 | dev->meta_dev = NULL; |
| 1111 | rdev->meta_bdev = NULL; |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1112 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1113 | if (rdev->sb_page) |
| 1114 | put_page(rdev->sb_page); |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1115 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1116 | rdev->sb_page = NULL; |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1117 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1118 | rdev->sb_loaded = 0; |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1119 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1120 | /* |
| 1121 | * We might be able to salvage the data device |
| 1122 | * even though the meta device has failed. For |
| 1123 | * now, we behave as though '- -' had been |
| 1124 | * set for this device in the table. |
| 1125 | */ |
| 1126 | if (dev->data_dev) |
| 1127 | dm_put_device(ti, dev->data_dev); |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1128 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1129 | dev->data_dev = NULL; |
| 1130 | rdev->bdev = NULL; |
Jonathan E Brassow | 0447568 | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 1131 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1132 | list_del(&rdev->same_set); |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1133 | } |
| 1134 | } |
| 1135 | |
| 1136 | if (!freshest) |
| 1137 | return 0; |
| 1138 | |
Jonathan Brassow | 55ebbb5 | 2013-01-22 21:42:18 -0600 | [diff] [blame] | 1139 | if (validate_raid_redundancy(rs)) { |
| 1140 | rs->ti->error = "Insufficient redundancy to activate array"; |
| 1141 | return -EINVAL; |
| 1142 | } |
| 1143 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1144 | /* |
| 1145 | * Validation of the freshest device provides the source of |
| 1146 | * validation for the remaining devices. |
| 1147 | */ |
| 1148 | ti->error = "Unable to assemble array: Invalid superblocks"; |
| 1149 | if (super_validate(mddev, freshest)) |
| 1150 | return -EINVAL; |
| 1151 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 1152 | rdev_for_each(rdev, mddev) |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1153 | if ((rdev != freshest) && super_validate(mddev, rdev)) |
| 1154 | return -EINVAL; |
| 1155 | |
| 1156 | return 0; |
| 1157 | } |
| 1158 | |
| 1159 | /* |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 1160 | * Enable/disable discard support on RAID set depending on |
| 1161 | * RAID level and discard properties of underlying RAID members. |
Heinz Mauelshagen | 75b8e04 | 2014-09-24 17:47:18 +0200 | [diff] [blame] | 1162 | */ |
| 1163 | static void configure_discard_support(struct dm_target *ti, struct raid_set *rs) |
| 1164 | { |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 1165 | int i; |
| 1166 | bool raid456; |
| 1167 | |
Heinz Mauelshagen | 75b8e04 | 2014-09-24 17:47:18 +0200 | [diff] [blame] | 1168 | /* Assume discards not supported until after checks below. */ |
| 1169 | ti->discards_supported = false; |
| 1170 | |
| 1171 | /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */ |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 1172 | raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6); |
Heinz Mauelshagen | 75b8e04 | 2014-09-24 17:47:18 +0200 | [diff] [blame] | 1173 | |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 1174 | for (i = 0; i < rs->md.raid_disks; i++) { |
Heinz Mauelshagen | d20c4b0 | 2014-10-29 19:02:27 +0100 | [diff] [blame] | 1175 | struct request_queue *q; |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 1176 | |
Heinz Mauelshagen | d20c4b0 | 2014-10-29 19:02:27 +0100 | [diff] [blame] | 1177 | if (!rs->dev[i].rdev.bdev) |
| 1178 | continue; |
| 1179 | |
| 1180 | q = bdev_get_queue(rs->dev[i].rdev.bdev); |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 1181 | if (!q || !blk_queue_discard(q)) |
| 1182 | return; |
| 1183 | |
| 1184 | if (raid456) { |
| 1185 | if (!q->limits.discard_zeroes_data) |
| 1186 | return; |
| 1187 | if (!devices_handle_discard_safely) { |
| 1188 | DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty."); |
| 1189 | DMERR("Set dm-raid.devices_handle_discard_safely=Y to override."); |
| 1190 | return; |
| 1191 | } |
| 1192 | } |
| 1193 | } |
| 1194 | |
| 1195 | /* All RAID members properly support discards */ |
Heinz Mauelshagen | 75b8e04 | 2014-09-24 17:47:18 +0200 | [diff] [blame] | 1196 | ti->discards_supported = true; |
| 1197 | |
| 1198 | /* |
| 1199 | * RAID1 and RAID10 personalities require bio splitting, |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 1200 | * RAID0/4/5/6 don't and process large discard bios properly. |
Heinz Mauelshagen | 75b8e04 | 2014-09-24 17:47:18 +0200 | [diff] [blame] | 1201 | */ |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 1202 | ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10); |
Heinz Mauelshagen | 75b8e04 | 2014-09-24 17:47:18 +0200 | [diff] [blame] | 1203 | ti->num_discard_bios = 1; |
| 1204 | } |
| 1205 | |
| 1206 | /* |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1207 | * Construct a RAID4/5/6 mapping: |
| 1208 | * Args: |
| 1209 | * <raid_type> <#raid_params> <raid_params> \ |
| 1210 | * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> } |
| 1211 | * |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1212 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
| 1213 | * details on possible <raid_params>. |
| 1214 | */ |
| 1215 | static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) |
| 1216 | { |
| 1217 | int ret; |
| 1218 | struct raid_type *rt; |
| 1219 | unsigned long num_raid_params, num_raid_devs; |
| 1220 | struct raid_set *rs = NULL; |
| 1221 | |
| 1222 | /* Must have at least <raid_type> <#raid_params> */ |
| 1223 | if (argc < 2) { |
| 1224 | ti->error = "Too few arguments"; |
| 1225 | return -EINVAL; |
| 1226 | } |
| 1227 | |
| 1228 | /* raid type */ |
| 1229 | rt = get_raid_type(argv[0]); |
| 1230 | if (!rt) { |
| 1231 | ti->error = "Unrecognised raid_type"; |
| 1232 | return -EINVAL; |
| 1233 | } |
| 1234 | argc--; |
| 1235 | argv++; |
| 1236 | |
| 1237 | /* number of RAID parameters */ |
Jingoo Han | b29bebd | 2013-06-01 16:15:16 +0900 | [diff] [blame] | 1238 | if (kstrtoul(argv[0], 10, &num_raid_params) < 0) { |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1239 | ti->error = "Cannot understand number of RAID parameters"; |
| 1240 | return -EINVAL; |
| 1241 | } |
| 1242 | argc--; |
| 1243 | argv++; |
| 1244 | |
| 1245 | /* Skip over RAID params for now and find out # of devices */ |
| 1246 | if (num_raid_params + 1 > argc) { |
| 1247 | ti->error = "Arguments do not agree with counts given"; |
| 1248 | return -EINVAL; |
| 1249 | } |
| 1250 | |
Jingoo Han | b29bebd | 2013-06-01 16:15:16 +0900 | [diff] [blame] | 1251 | if ((kstrtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1252 | (num_raid_devs >= INT_MAX)) { |
| 1253 | ti->error = "Cannot understand number of raid devices"; |
| 1254 | return -EINVAL; |
| 1255 | } |
| 1256 | |
| 1257 | rs = context_alloc(ti, rt, (unsigned)num_raid_devs); |
| 1258 | if (IS_ERR(rs)) |
| 1259 | return PTR_ERR(rs); |
| 1260 | |
| 1261 | ret = parse_raid_params(rs, argv, (unsigned)num_raid_params); |
| 1262 | if (ret) |
| 1263 | goto bad; |
| 1264 | |
| 1265 | ret = -EINVAL; |
| 1266 | |
| 1267 | argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */ |
| 1268 | argv += num_raid_params + 1; |
| 1269 | |
| 1270 | if (argc != (num_raid_devs * 2)) { |
| 1271 | ti->error = "Supplied RAID devices does not match the count given"; |
| 1272 | goto bad; |
| 1273 | } |
| 1274 | |
| 1275 | ret = dev_parms(rs, argv); |
| 1276 | if (ret) |
| 1277 | goto bad; |
| 1278 | |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1279 | rs->md.sync_super = super_sync; |
| 1280 | ret = analyse_superblocks(ti, rs); |
| 1281 | if (ret) |
| 1282 | goto bad; |
| 1283 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1284 | INIT_WORK(&rs->md.event_work, do_table_event); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1285 | ti->private = rs; |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1286 | ti->num_flush_bios = 1; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1287 | |
Heinz Mauelshagen | 75b8e04 | 2014-09-24 17:47:18 +0200 | [diff] [blame] | 1288 | /* |
| 1289 | * Disable/enable discard support on RAID set. |
| 1290 | */ |
| 1291 | configure_discard_support(ti, rs); |
| 1292 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1293 | mutex_lock(&rs->md.reconfig_mutex); |
| 1294 | ret = md_run(&rs->md); |
| 1295 | rs->md.in_sync = 0; /* Assume already marked dirty */ |
| 1296 | mutex_unlock(&rs->md.reconfig_mutex); |
| 1297 | |
| 1298 | if (ret) { |
| 1299 | ti->error = "Fail to run raid array"; |
| 1300 | goto bad; |
| 1301 | } |
| 1302 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 1303 | if (ti->len != rs->md.array_sectors) { |
| 1304 | ti->error = "Array size does not match requested target length"; |
| 1305 | ret = -EINVAL; |
| 1306 | goto size_mismatch; |
| 1307 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1308 | rs->callbacks.congested_fn = raid_is_congested; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1309 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
| 1310 | |
Jonathan Brassow | 3273727 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1311 | mddev_suspend(&rs->md); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1312 | return 0; |
| 1313 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 1314 | size_mismatch: |
| 1315 | md_stop(&rs->md); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1316 | bad: |
| 1317 | context_free(rs); |
| 1318 | |
| 1319 | return ret; |
| 1320 | } |
| 1321 | |
| 1322 | static void raid_dtr(struct dm_target *ti) |
| 1323 | { |
| 1324 | struct raid_set *rs = ti->private; |
| 1325 | |
| 1326 | list_del_init(&rs->callbacks.list); |
| 1327 | md_stop(&rs->md); |
| 1328 | context_free(rs); |
| 1329 | } |
| 1330 | |
Mikulas Patocka | 7de3ee5 | 2012-12-21 20:23:41 +0000 | [diff] [blame] | 1331 | static int raid_map(struct dm_target *ti, struct bio *bio) |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1332 | { |
| 1333 | struct raid_set *rs = ti->private; |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1334 | struct mddev *mddev = &rs->md; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1335 | |
| 1336 | mddev->pers->make_request(mddev, bio); |
| 1337 | |
| 1338 | return DM_MAPIO_SUBMITTED; |
| 1339 | } |
| 1340 | |
Jonathan Brassow | be83651 | 2013-04-24 11:42:43 +1000 | [diff] [blame] | 1341 | static const char *decipher_sync_action(struct mddev *mddev) |
| 1342 | { |
| 1343 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
| 1344 | return "frozen"; |
| 1345 | |
| 1346 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
| 1347 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
| 1348 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| 1349 | return "reshape"; |
| 1350 | |
| 1351 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
| 1352 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
| 1353 | return "resync"; |
| 1354 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) |
| 1355 | return "check"; |
| 1356 | return "repair"; |
| 1357 | } |
| 1358 | |
| 1359 | if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
| 1360 | return "recover"; |
| 1361 | } |
| 1362 | |
| 1363 | return "idle"; |
| 1364 | } |
| 1365 | |
Mikulas Patocka | fd7c092 | 2013-03-01 22:45:44 +0000 | [diff] [blame] | 1366 | static void raid_status(struct dm_target *ti, status_type_t type, |
| 1367 | unsigned status_flags, char *result, unsigned maxlen) |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1368 | { |
| 1369 | struct raid_set *rs = ti->private; |
| 1370 | unsigned raid_param_cnt = 1; /* at least 1 for chunksize */ |
| 1371 | unsigned sz = 0; |
Jonathan E Brassow | 2e727c3 | 2011-10-31 20:21:26 +0000 | [diff] [blame] | 1372 | int i, array_in_sync = 0; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1373 | sector_t sync; |
| 1374 | |
| 1375 | switch (type) { |
| 1376 | case STATUSTYPE_INFO: |
| 1377 | DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks); |
| 1378 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1379 | if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery)) |
| 1380 | sync = rs->md.curr_resync_completed; |
| 1381 | else |
| 1382 | sync = rs->md.recovery_cp; |
| 1383 | |
Jonathan E Brassow | 2e727c3 | 2011-10-31 20:21:26 +0000 | [diff] [blame] | 1384 | if (sync >= rs->md.resync_max_sectors) { |
Jonathan Brassow | be83651 | 2013-04-24 11:42:43 +1000 | [diff] [blame] | 1385 | /* |
| 1386 | * Sync complete. |
| 1387 | */ |
Jonathan E Brassow | 2e727c3 | 2011-10-31 20:21:26 +0000 | [diff] [blame] | 1388 | array_in_sync = 1; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1389 | sync = rs->md.resync_max_sectors; |
Jonathan Brassow | be83651 | 2013-04-24 11:42:43 +1000 | [diff] [blame] | 1390 | } else if (test_bit(MD_RECOVERY_REQUESTED, &rs->md.recovery)) { |
| 1391 | /* |
| 1392 | * If "check" or "repair" is occurring, the array has |
| 1393 | * undergone and initial sync and the health characters |
| 1394 | * should not be 'a' anymore. |
| 1395 | */ |
| 1396 | array_in_sync = 1; |
Jonathan E Brassow | 2e727c3 | 2011-10-31 20:21:26 +0000 | [diff] [blame] | 1397 | } else { |
| 1398 | /* |
| 1399 | * The array may be doing an initial sync, or it may |
| 1400 | * be rebuilding individual components. If all the |
| 1401 | * devices are In_sync, then it is the array that is |
| 1402 | * being initialized. |
| 1403 | */ |
| 1404 | for (i = 0; i < rs->md.raid_disks; i++) |
| 1405 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 1406 | array_in_sync = 1; |
| 1407 | } |
Jonathan Brassow | be83651 | 2013-04-24 11:42:43 +1000 | [diff] [blame] | 1408 | |
Jonathan E Brassow | 2e727c3 | 2011-10-31 20:21:26 +0000 | [diff] [blame] | 1409 | /* |
| 1410 | * Status characters: |
| 1411 | * 'D' = Dead/Failed device |
| 1412 | * 'a' = Alive but not in-sync |
| 1413 | * 'A' = Alive and in-sync |
| 1414 | */ |
| 1415 | for (i = 0; i < rs->md.raid_disks; i++) { |
| 1416 | if (test_bit(Faulty, &rs->dev[i].rdev.flags)) |
| 1417 | DMEMIT("D"); |
| 1418 | else if (!array_in_sync || |
| 1419 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 1420 | DMEMIT("a"); |
| 1421 | else |
| 1422 | DMEMIT("A"); |
| 1423 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1424 | |
Jonathan E Brassow | 2e727c3 | 2011-10-31 20:21:26 +0000 | [diff] [blame] | 1425 | /* |
| 1426 | * In-sync ratio: |
| 1427 | * The in-sync ratio shows the progress of: |
| 1428 | * - Initializing the array |
| 1429 | * - Rebuilding a subset of devices of the array |
| 1430 | * The user can distinguish between the two by referring |
| 1431 | * to the status characters. |
| 1432 | */ |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1433 | DMEMIT(" %llu/%llu", |
| 1434 | (unsigned long long) sync, |
| 1435 | (unsigned long long) rs->md.resync_max_sectors); |
| 1436 | |
Jonathan Brassow | be83651 | 2013-04-24 11:42:43 +1000 | [diff] [blame] | 1437 | /* |
| 1438 | * Sync action: |
| 1439 | * See Documentation/device-mapper/dm-raid.c for |
| 1440 | * information on each of these states. |
| 1441 | */ |
| 1442 | DMEMIT(" %s", decipher_sync_action(&rs->md)); |
| 1443 | |
| 1444 | /* |
| 1445 | * resync_mismatches/mismatch_cnt |
| 1446 | * This field shows the number of discrepancies found when |
| 1447 | * performing a "check" of the array. |
| 1448 | */ |
| 1449 | DMEMIT(" %llu", |
Jonathan Brassow | c4a3955 | 2013-06-25 01:23:59 -0500 | [diff] [blame] | 1450 | (strcmp(rs->md.last_sync_action, "check")) ? 0 : |
Jonathan Brassow | be83651 | 2013-04-24 11:42:43 +1000 | [diff] [blame] | 1451 | (unsigned long long) |
| 1452 | atomic64_read(&rs->md.resync_mismatches)); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1453 | break; |
| 1454 | case STATUSTYPE_TABLE: |
| 1455 | /* The string you would use to construct this array */ |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1456 | for (i = 0; i < rs->md.raid_disks; i++) { |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 1457 | if ((rs->print_flags & DMPF_REBUILD) && |
| 1458 | rs->dev[i].data_dev && |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1459 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 1460 | raid_param_cnt += 2; /* for rebuilds */ |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1461 | if (rs->dev[i].data_dev && |
| 1462 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) |
| 1463 | raid_param_cnt += 2; |
| 1464 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1465 | |
Jonathan Brassow | 34f8ac6d | 2012-01-27 14:53:53 -0600 | [diff] [blame] | 1466 | raid_param_cnt += (hweight32(rs->print_flags & ~DMPF_REBUILD) * 2); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1467 | if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)) |
| 1468 | raid_param_cnt--; |
| 1469 | |
| 1470 | DMEMIT("%s %u %u", rs->raid_type->name, |
| 1471 | raid_param_cnt, rs->md.chunk_sectors); |
| 1472 | |
| 1473 | if ((rs->print_flags & DMPF_SYNC) && |
| 1474 | (rs->md.recovery_cp == MaxSector)) |
| 1475 | DMEMIT(" sync"); |
| 1476 | if (rs->print_flags & DMPF_NOSYNC) |
| 1477 | DMEMIT(" nosync"); |
| 1478 | |
| 1479 | for (i = 0; i < rs->md.raid_disks; i++) |
Jonathan Brassow | 13c8758 | 2011-08-02 12:32:03 +0100 | [diff] [blame] | 1480 | if ((rs->print_flags & DMPF_REBUILD) && |
| 1481 | rs->dev[i].data_dev && |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1482 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
| 1483 | DMEMIT(" rebuild %u", i); |
| 1484 | |
| 1485 | if (rs->print_flags & DMPF_DAEMON_SLEEP) |
| 1486 | DMEMIT(" daemon_sleep %lu", |
| 1487 | rs->md.bitmap_info.daemon_sleep); |
| 1488 | |
| 1489 | if (rs->print_flags & DMPF_MIN_RECOVERY_RATE) |
| 1490 | DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min); |
| 1491 | |
| 1492 | if (rs->print_flags & DMPF_MAX_RECOVERY_RATE) |
| 1493 | DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max); |
| 1494 | |
Jonathan Brassow | 46bed2b | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1495 | for (i = 0; i < rs->md.raid_disks; i++) |
| 1496 | if (rs->dev[i].data_dev && |
| 1497 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) |
| 1498 | DMEMIT(" write_mostly %u", i); |
| 1499 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1500 | if (rs->print_flags & DMPF_MAX_WRITE_BEHIND) |
| 1501 | DMEMIT(" max_write_behind %lu", |
| 1502 | rs->md.bitmap_info.max_write_behind); |
| 1503 | |
| 1504 | if (rs->print_flags & DMPF_STRIPE_CACHE) { |
NeilBrown | d1688a6 | 2011-10-11 16:49:52 +1100 | [diff] [blame] | 1505 | struct r5conf *conf = rs->md.private; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1506 | |
| 1507 | /* convert from kiB to sectors */ |
| 1508 | DMEMIT(" stripe_cache %d", |
| 1509 | conf ? conf->max_nr_stripes * 2 : 0); |
| 1510 | } |
| 1511 | |
Jonathan Brassow | c108456 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1512 | if (rs->print_flags & DMPF_REGION_SIZE) |
| 1513 | DMEMIT(" region_size %lu", |
| 1514 | rs->md.bitmap_info.chunksize >> 9); |
| 1515 | |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 1516 | if (rs->print_flags & DMPF_RAID10_COPIES) |
| 1517 | DMEMIT(" raid10_copies %u", |
| 1518 | raid10_md_layout_to_copies(rs->md.layout)); |
| 1519 | |
| 1520 | if (rs->print_flags & DMPF_RAID10_FORMAT) |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 1521 | DMEMIT(" raid10_format %s", |
| 1522 | raid10_md_layout_to_format(rs->md.layout)); |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 1523 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1524 | DMEMIT(" %d", rs->md.raid_disks); |
| 1525 | for (i = 0; i < rs->md.raid_disks; i++) { |
Jonathan Brassow | b12d437 | 2011-08-02 12:32:07 +0100 | [diff] [blame] | 1526 | if (rs->dev[i].meta_dev) |
| 1527 | DMEMIT(" %s", rs->dev[i].meta_dev->name); |
| 1528 | else |
| 1529 | DMEMIT(" -"); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1530 | |
| 1531 | if (rs->dev[i].data_dev) |
| 1532 | DMEMIT(" %s", rs->dev[i].data_dev->name); |
| 1533 | else |
| 1534 | DMEMIT(" -"); |
| 1535 | } |
| 1536 | } |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1537 | } |
| 1538 | |
Jonathan Brassow | be83651 | 2013-04-24 11:42:43 +1000 | [diff] [blame] | 1539 | static int raid_message(struct dm_target *ti, unsigned argc, char **argv) |
| 1540 | { |
| 1541 | struct raid_set *rs = ti->private; |
| 1542 | struct mddev *mddev = &rs->md; |
| 1543 | |
| 1544 | if (!strcasecmp(argv[0], "reshape")) { |
| 1545 | DMERR("Reshape not supported."); |
| 1546 | return -EINVAL; |
| 1547 | } |
| 1548 | |
| 1549 | if (!mddev->pers || !mddev->pers->sync_request) |
| 1550 | return -EINVAL; |
| 1551 | |
| 1552 | if (!strcasecmp(argv[0], "frozen")) |
| 1553 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 1554 | else |
| 1555 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 1556 | |
| 1557 | if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) { |
| 1558 | if (mddev->sync_thread) { |
| 1559 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 1560 | md_reap_sync_thread(mddev); |
| 1561 | } |
| 1562 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
| 1563 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
| 1564 | return -EBUSY; |
| 1565 | else if (!strcasecmp(argv[0], "resync")) |
| 1566 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 1567 | else if (!strcasecmp(argv[0], "recover")) { |
| 1568 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 1569 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 1570 | } else { |
| 1571 | if (!strcasecmp(argv[0], "check")) |
| 1572 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
| 1573 | else if (!!strcasecmp(argv[0], "repair")) |
| 1574 | return -EINVAL; |
| 1575 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
| 1576 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 1577 | } |
| 1578 | if (mddev->ro == 2) { |
| 1579 | /* A write to sync_action is enough to justify |
| 1580 | * canceling read-auto mode |
| 1581 | */ |
| 1582 | mddev->ro = 0; |
| 1583 | if (!mddev->suspended) |
| 1584 | md_wakeup_thread(mddev->sync_thread); |
| 1585 | } |
| 1586 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 1587 | if (!mddev->suspended) |
| 1588 | md_wakeup_thread(mddev->thread); |
| 1589 | |
| 1590 | return 0; |
| 1591 | } |
| 1592 | |
| 1593 | static int raid_iterate_devices(struct dm_target *ti, |
| 1594 | iterate_devices_callout_fn fn, void *data) |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1595 | { |
| 1596 | struct raid_set *rs = ti->private; |
| 1597 | unsigned i; |
| 1598 | int ret = 0; |
| 1599 | |
| 1600 | for (i = 0; !ret && i < rs->md.raid_disks; i++) |
| 1601 | if (rs->dev[i].data_dev) |
| 1602 | ret = fn(ti, |
| 1603 | rs->dev[i].data_dev, |
| 1604 | 0, /* No offset on data devs */ |
| 1605 | rs->md.dev_sectors, |
| 1606 | data); |
| 1607 | |
| 1608 | return ret; |
| 1609 | } |
| 1610 | |
| 1611 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) |
| 1612 | { |
| 1613 | struct raid_set *rs = ti->private; |
| 1614 | unsigned chunk_size = rs->md.chunk_sectors << 9; |
NeilBrown | d1688a6 | 2011-10-11 16:49:52 +1100 | [diff] [blame] | 1615 | struct r5conf *conf = rs->md.private; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1616 | |
| 1617 | blk_limits_io_min(limits, chunk_size); |
| 1618 | blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); |
| 1619 | } |
| 1620 | |
| 1621 | static void raid_presuspend(struct dm_target *ti) |
| 1622 | { |
| 1623 | struct raid_set *rs = ti->private; |
| 1624 | |
| 1625 | md_stop_writes(&rs->md); |
| 1626 | } |
| 1627 | |
| 1628 | static void raid_postsuspend(struct dm_target *ti) |
| 1629 | { |
| 1630 | struct raid_set *rs = ti->private; |
| 1631 | |
| 1632 | mddev_suspend(&rs->md); |
| 1633 | } |
| 1634 | |
Jonathan Brassow | f381e71 | 2013-05-08 17:57:13 -0500 | [diff] [blame] | 1635 | static void attempt_restore_of_faulty_devices(struct raid_set *rs) |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1636 | { |
Jonathan Brassow | 9092c02 | 2013-05-02 14:19:24 -0500 | [diff] [blame] | 1637 | int i; |
| 1638 | uint64_t failed_devices, cleared_failed_devices = 0; |
| 1639 | unsigned long flags; |
| 1640 | struct dm_raid_superblock *sb; |
Jonathan Brassow | 9092c02 | 2013-05-02 14:19:24 -0500 | [diff] [blame] | 1641 | struct md_rdev *r; |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1642 | |
Jonathan Brassow | f381e71 | 2013-05-08 17:57:13 -0500 | [diff] [blame] | 1643 | for (i = 0; i < rs->md.raid_disks; i++) { |
| 1644 | r = &rs->dev[i].rdev; |
| 1645 | if (test_bit(Faulty, &r->flags) && r->sb_page && |
| 1646 | sync_page_io(r, 0, r->sb_size, r->sb_page, READ, 1)) { |
| 1647 | DMINFO("Faulty %s device #%d has readable super block." |
| 1648 | " Attempting to revive it.", |
| 1649 | rs->raid_type->name, i); |
Jonathan Brassow | a4dc163 | 2013-05-08 18:00:54 -0500 | [diff] [blame] | 1650 | |
| 1651 | /* |
| 1652 | * Faulty bit may be set, but sometimes the array can |
| 1653 | * be suspended before the personalities can respond |
| 1654 | * by removing the device from the array (i.e. calling |
| 1655 | * 'hot_remove_disk'). If they haven't yet removed |
| 1656 | * the failed device, its 'raid_disk' number will be |
| 1657 | * '>= 0' - meaning we must call this function |
| 1658 | * ourselves. |
| 1659 | */ |
| 1660 | if ((r->raid_disk >= 0) && |
| 1661 | (r->mddev->pers->hot_remove_disk(r->mddev, r) != 0)) |
| 1662 | /* Failed to revive this device, try next */ |
| 1663 | continue; |
| 1664 | |
Jonathan Brassow | f381e71 | 2013-05-08 17:57:13 -0500 | [diff] [blame] | 1665 | r->raid_disk = i; |
| 1666 | r->saved_raid_disk = i; |
| 1667 | flags = r->flags; |
| 1668 | clear_bit(Faulty, &r->flags); |
| 1669 | clear_bit(WriteErrorSeen, &r->flags); |
| 1670 | clear_bit(In_sync, &r->flags); |
| 1671 | if (r->mddev->pers->hot_add_disk(r->mddev, r)) { |
| 1672 | r->raid_disk = -1; |
| 1673 | r->saved_raid_disk = -1; |
| 1674 | r->flags = flags; |
| 1675 | } else { |
| 1676 | r->recovery_offset = 0; |
| 1677 | cleared_failed_devices |= 1 << i; |
| 1678 | } |
| 1679 | } |
| 1680 | } |
| 1681 | if (cleared_failed_devices) { |
| 1682 | rdev_for_each(r, &rs->md) { |
| 1683 | sb = page_address(r->sb_page); |
| 1684 | failed_devices = le64_to_cpu(sb->failed_devices); |
| 1685 | failed_devices &= ~cleared_failed_devices; |
| 1686 | sb->failed_devices = cpu_to_le64(failed_devices); |
| 1687 | } |
| 1688 | } |
| 1689 | } |
| 1690 | |
| 1691 | static void raid_resume(struct dm_target *ti) |
| 1692 | { |
| 1693 | struct raid_set *rs = ti->private; |
| 1694 | |
Jonathan Brassow | 81f382f | 2012-05-22 13:55:30 +1000 | [diff] [blame] | 1695 | set_bit(MD_CHANGE_DEVS, &rs->md.flags); |
Jonathan Brassow | 34f8ac6d | 2012-01-27 14:53:53 -0600 | [diff] [blame] | 1696 | if (!rs->bitmap_loaded) { |
| 1697 | bitmap_load(&rs->md); |
| 1698 | rs->bitmap_loaded = 1; |
Jonathan Brassow | 9092c02 | 2013-05-02 14:19:24 -0500 | [diff] [blame] | 1699 | } else { |
| 1700 | /* |
| 1701 | * A secondary resume while the device is active. |
| 1702 | * Take this opportunity to check whether any failed |
| 1703 | * devices are reachable again. |
| 1704 | */ |
Jonathan Brassow | f381e71 | 2013-05-08 17:57:13 -0500 | [diff] [blame] | 1705 | attempt_restore_of_faulty_devices(rs); |
Jonathan Brassow | 47525e5 | 2012-05-22 13:55:29 +1000 | [diff] [blame] | 1706 | } |
Jonathan Brassow | 34f8ac6d | 2012-01-27 14:53:53 -0600 | [diff] [blame] | 1707 | |
Jonathan Brassow | 47525e5 | 2012-05-22 13:55:29 +1000 | [diff] [blame] | 1708 | clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1709 | mddev_resume(&rs->md); |
| 1710 | } |
| 1711 | |
| 1712 | static struct target_type raid_target = { |
| 1713 | .name = "raid", |
Heinz Mauelshagen | 75b8e04 | 2014-09-24 17:47:18 +0200 | [diff] [blame] | 1714 | .version = {1, 6, 0}, |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1715 | .module = THIS_MODULE, |
| 1716 | .ctr = raid_ctr, |
| 1717 | .dtr = raid_dtr, |
| 1718 | .map = raid_map, |
| 1719 | .status = raid_status, |
Jonathan Brassow | be83651 | 2013-04-24 11:42:43 +1000 | [diff] [blame] | 1720 | .message = raid_message, |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1721 | .iterate_devices = raid_iterate_devices, |
| 1722 | .io_hints = raid_io_hints, |
| 1723 | .presuspend = raid_presuspend, |
| 1724 | .postsuspend = raid_postsuspend, |
| 1725 | .resume = raid_resume, |
| 1726 | }; |
| 1727 | |
| 1728 | static int __init dm_raid_init(void) |
| 1729 | { |
Jonathan Brassow | fe5d2f4 | 2013-02-21 13:28:10 +1100 | [diff] [blame] | 1730 | DMINFO("Loading target version %u.%u.%u", |
| 1731 | raid_target.version[0], |
| 1732 | raid_target.version[1], |
| 1733 | raid_target.version[2]); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1734 | return dm_register_target(&raid_target); |
| 1735 | } |
| 1736 | |
| 1737 | static void __exit dm_raid_exit(void) |
| 1738 | { |
| 1739 | dm_unregister_target(&raid_target); |
| 1740 | } |
| 1741 | |
| 1742 | module_init(dm_raid_init); |
| 1743 | module_exit(dm_raid_exit); |
| 1744 | |
Heinz Mauelshagen | 48cf06b | 2014-09-24 17:47:19 +0200 | [diff] [blame] | 1745 | module_param(devices_handle_discard_safely, bool, 0644); |
| 1746 | MODULE_PARM_DESC(devices_handle_discard_safely, |
| 1747 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); |
| 1748 | |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1749 | MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); |
Jonathan Brassow | 63f33b8d | 2012-07-31 21:44:26 -0500 | [diff] [blame] | 1750 | MODULE_ALIAS("dm-raid1"); |
| 1751 | MODULE_ALIAS("dm-raid10"); |
NeilBrown | 9d09e66 | 2011-01-13 20:00:02 +0000 | [diff] [blame] | 1752 | MODULE_ALIAS("dm-raid4"); |
| 1753 | MODULE_ALIAS("dm-raid5"); |
| 1754 | MODULE_ALIAS("dm-raid6"); |
| 1755 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); |
| 1756 | MODULE_LICENSE("GPL"); |