Commit | Line | Data |
---|---|---|
9d09e663 N |
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> | |
056075c7 | 9 | #include <linux/module.h> |
9d09e663 N |
10 | |
11 | #include "md.h" | |
32737279 | 12 | #include "raid1.h" |
9d09e663 | 13 | #include "raid5.h" |
63f33b8d | 14 | #include "raid10.h" |
9d09e663 N |
15 | #include "bitmap.h" |
16 | ||
3e8dbb7f AK |
17 | #include <linux/device-mapper.h> |
18 | ||
9d09e663 N |
19 | #define DM_MSG_PREFIX "raid" |
20 | ||
21 | /* | |
b12d437b JB |
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. | |
9d09e663 | 24 | */ |
b12d437b | 25 | #define FirstUse 10 /* rdev flag */ |
9d09e663 N |
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; | |
3cb03002 | 42 | struct md_rdev rdev; |
9d09e663 N |
43 | }; |
44 | ||
45 | /* | |
46 | * Flags for rs->print_flags field. | |
47 | */ | |
13c87583 JB |
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 | |
63f33b8d JB |
56 | #define DMPF_REGION_SIZE 0x100 |
57 | #define DMPF_RAID10_COPIES 0x200 | |
58 | #define DMPF_RAID10_FORMAT 0x400 | |
59 | ||
9d09e663 N |
60 | struct raid_set { |
61 | struct dm_target *ti; | |
62 | ||
34f8ac6d JB |
63 | uint32_t bitmap_loaded; |
64 | uint32_t print_flags; | |
9d09e663 | 65 | |
fd01b88c | 66 | struct mddev md; |
9d09e663 N |
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[] = { | |
32737279 | 82 | {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */}, |
63f33b8d | 83 | {"raid10", "RAID10 (striped mirrors)", 0, 2, 10, UINT_MAX /* Varies */}, |
9d09e663 N |
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 | ||
63f33b8d JB |
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 | ||
9d09e663 N |
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; | |
9d09e663 N |
120 | |
121 | if (raid_devs <= raid_type->parity_devs) { | |
122 | ti->error = "Insufficient number of devices"; | |
123 | return ERR_PTR(-EINVAL); | |
124 | } | |
125 | ||
9d09e663 N |
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; | |
9d09e663 N |
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 | |
c039c332 | 153 | * rs->md.dev_sectors |
9d09e663 N |
154 | */ |
155 | ||
156 | return rs; | |
157 | } | |
158 | ||
159 | static void context_free(struct raid_set *rs) | |
160 | { | |
161 | int i; | |
162 | ||
b12d437b JB |
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); | |
545c8795 | 166 | md_rdev_clear(&rs->dev[i].rdev); |
9d09e663 N |
167 | if (rs->dev[i].data_dev) |
168 | dm_put_device(rs->ti, rs->dev[i].data_dev); | |
b12d437b | 169 | } |
9d09e663 N |
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 | * | |
b12d437b JB |
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. | |
9d09e663 N |
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], "-")) { | |
b12d437b JB |
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; | |
9d09e663 N |
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 | ||
b12d437b JB |
230 | rs->ti->error = "No data device supplied with metadata device"; |
231 | if (rs->dev[i].meta_dev) | |
232 | return -EINVAL; | |
233 | ||
9d09e663 N |
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 | ||
b12d437b JB |
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 | } | |
9d09e663 N |
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 | ||
c1084561 JB |
279 | /* |
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)) { | |
3a0f9aae JB |
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); | |
c1084561 JB |
301 | DMINFO("Choosing default region size of %lu sectors", |
302 | region_size); | |
c1084561 JB |
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 | ||
eb649123 | 342 | /* |
55ebbb59 | 343 | * validate_raid_redundancy |
eb649123 JB |
344 | * @rs |
345 | * | |
55ebbb59 JB |
346 | * Determine if there are enough devices in the array that haven't |
347 | * failed (or are being rebuilt) to form a usable array. | |
eb649123 JB |
348 | * |
349 | * Returns: 0 on success, -EINVAL on failure. | |
350 | */ | |
55ebbb59 | 351 | static int validate_raid_redundancy(struct raid_set *rs) |
eb649123 JB |
352 | { |
353 | unsigned i, rebuild_cnt = 0; | |
4ec1e369 | 354 | unsigned rebuilds_per_group, copies, d; |
eb649123 | 355 | |
eb649123 | 356 | for (i = 0; i < rs->md.raid_disks; i++) |
55ebbb59 JB |
357 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || |
358 | !rs->dev[i].rdev.sb_page) | |
eb649123 JB |
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: | |
4ec1e369 JB |
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 | */ | |
4ec1e369 | 394 | for (i = 0; i < rs->md.raid_disks * copies; i++) { |
55ebbb59 JB |
395 | if (!(i % copies)) |
396 | rebuilds_per_group = 0; | |
4ec1e369 | 397 | d = i % rs->md.raid_disks; |
55ebbb59 JB |
398 | if ((!rs->dev[d].rdev.sb_page || |
399 | !test_bit(In_sync, &rs->dev[d].rdev.flags)) && | |
4ec1e369 JB |
400 | (++rebuilds_per_group >= copies)) |
401 | goto too_many; | |
4ec1e369 JB |
402 | } |
403 | break; | |
eb649123 | 404 | default: |
55ebbb59 JB |
405 | if (rebuild_cnt) |
406 | return -EINVAL; | |
eb649123 JB |
407 | } |
408 | ||
409 | return 0; | |
410 | ||
411 | too_many: | |
eb649123 JB |
412 | return -EINVAL; |
413 | } | |
414 | ||
9d09e663 N |
415 | /* |
416 | * Possible arguments are... | |
9d09e663 N |
417 | * <chunk_size> [optional_args] |
418 | * | |
32737279 JB |
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 | |
9d09e663 | 424 | * [rebuild <idx>] Rebuild the drive indicated by the index |
32737279 JB |
425 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
426 | * clear bits | |
9d09e663 N |
427 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
428 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization | |
46bed2b5 | 429 | * [write_mostly <idx>] Indicate a write mostly drive via index |
9d09e663 N |
430 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
431 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs | |
c1084561 | 432 | * [region_size <sectors>] Defines granularity of bitmap |
63f33b8d JB |
433 | * |
434 | * RAID10-only options: | |
435 | * [raid10_copies <# copies>] Number of copies. (Default: 2) | |
436 | * [raid10_format <near>] Layout algorithm. (Default: near) | |
9d09e663 N |
437 | */ |
438 | static int parse_raid_params(struct raid_set *rs, char **argv, | |
439 | unsigned num_raid_params) | |
440 | { | |
63f33b8d JB |
441 | char *raid10_format = "near"; |
442 | unsigned raid10_copies = 2; | |
eb649123 | 443 | unsigned i; |
c1084561 | 444 | unsigned long value, region_size = 0; |
c039c332 | 445 | sector_t sectors_per_dev = rs->ti->len; |
542f9038 | 446 | sector_t max_io_len; |
9d09e663 N |
447 | char *key; |
448 | ||
449 | /* | |
450 | * First, parse the in-order required arguments | |
32737279 | 451 | * "chunk_size" is the only argument of this type. |
9d09e663 | 452 | */ |
32737279 | 453 | if ((strict_strtoul(argv[0], 10, &value) < 0)) { |
9d09e663 N |
454 | rs->ti->error = "Bad chunk size"; |
455 | return -EINVAL; | |
32737279 JB |
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; | |
9d09e663 N |
466 | } |
467 | ||
468 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; | |
469 | argv++; | |
470 | num_raid_params--; | |
471 | ||
472 | /* | |
b12d437b JB |
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. | |
9d09e663 | 488 | */ |
b12d437b | 489 | for (i = 0; i < rs->md.raid_disks; i++) { |
9d09e663 | 490 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
b12d437b JB |
491 | rs->dev[i].rdev.recovery_offset = MaxSector; |
492 | } | |
9d09e663 | 493 | |
b12d437b JB |
494 | /* |
495 | * Second, parse the unordered optional arguments | |
496 | */ | |
9d09e663 | 497 | for (i = 0; i < num_raid_params; i++) { |
13c87583 | 498 | if (!strcasecmp(argv[i], "nosync")) { |
9d09e663 N |
499 | rs->md.recovery_cp = MaxSector; |
500 | rs->print_flags |= DMPF_NOSYNC; | |
9d09e663 N |
501 | continue; |
502 | } | |
13c87583 | 503 | if (!strcasecmp(argv[i], "sync")) { |
9d09e663 N |
504 | rs->md.recovery_cp = 0; |
505 | rs->print_flags |= DMPF_SYNC; | |
9d09e663 N |
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++]; | |
63f33b8d JB |
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 | ||
9d09e663 N |
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 | ||
63f33b8d | 537 | /* Parameters that take a numeric value are checked here */ |
13c87583 | 538 | if (!strcasecmp(key, "rebuild")) { |
7386199c | 539 | if (value >= rs->md.raid_disks) { |
9d09e663 N |
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; | |
13c87583 | 545 | rs->print_flags |= DMPF_REBUILD; |
46bed2b5 JB |
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 | } | |
82324809 | 551 | if (value >= rs->md.raid_disks) { |
46bed2b5 JB |
552 | rs->ti->error = "Invalid write_mostly drive index given"; |
553 | return -EINVAL; | |
554 | } | |
555 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); | |
13c87583 | 556 | } else if (!strcasecmp(key, "max_write_behind")) { |
46bed2b5 JB |
557 | if (rs->raid_type->level != 1) { |
558 | rs->ti->error = "max_write_behind option is only valid for RAID1"; | |
559 | return -EINVAL; | |
560 | } | |
9d09e663 N |
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; | |
13c87583 | 573 | } else if (!strcasecmp(key, "daemon_sleep")) { |
9d09e663 N |
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; | |
13c87583 | 580 | } else if (!strcasecmp(key, "stripe_cache")) { |
9d09e663 N |
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 | ||
63f33b8d JB |
589 | if ((rs->raid_type->level != 5) && |
590 | (rs->raid_type->level != 6)) { | |
9d09e663 N |
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 | } | |
13c87583 | 598 | } else if (!strcasecmp(key, "min_recovery_rate")) { |
9d09e663 N |
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; | |
13c87583 | 605 | } else if (!strcasecmp(key, "max_recovery_rate")) { |
9d09e663 N |
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; | |
c1084561 JB |
612 | } else if (!strcasecmp(key, "region_size")) { |
613 | rs->print_flags |= DMPF_REGION_SIZE; | |
614 | region_size = value; | |
63f33b8d JB |
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; | |
9d09e663 N |
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 | ||
c1084561 JB |
630 | if (validate_region_size(rs, region_size)) |
631 | return -EINVAL; | |
632 | ||
633 | if (rs->md.chunk_sectors) | |
542f9038 | 634 | max_io_len = rs->md.chunk_sectors; |
c1084561 | 635 | else |
542f9038 | 636 | max_io_len = region_size; |
c1084561 | 637 | |
542f9038 MS |
638 | if (dm_set_target_max_io_len(rs->ti, max_io_len)) |
639 | return -EINVAL; | |
32737279 | 640 | |
63f33b8d JB |
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))) { | |
c039c332 JB |
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 | ||
9d09e663 N |
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 | ||
32737279 JB |
680 | if (rs->raid_type->level == 1) |
681 | return md_raid1_congested(&rs->md, bits); | |
682 | ||
63f33b8d JB |
683 | if (rs->raid_type->level == 10) |
684 | return md_raid10_congested(&rs->md, bits); | |
685 | ||
9d09e663 N |
686 | return md_raid5_congested(&rs->md, bits); |
687 | } | |
688 | ||
b12d437b JB |
689 | /* |
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 | ||
3cb03002 | 727 | static int read_disk_sb(struct md_rdev *rdev, int size) |
b12d437b JB |
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)) { | |
0447568f JB |
735 | DMERR("Failed to read superblock of device at position %d", |
736 | rdev->raid_disk); | |
c32fb9e7 | 737 | md_error(rdev->mddev, rdev); |
b12d437b JB |
738 | return -EINVAL; |
739 | } | |
740 | ||
741 | rdev->sb_loaded = 1; | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
fd01b88c | 746 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b | 747 | { |
81f382f9 | 748 | int i; |
b12d437b JB |
749 | uint64_t failed_devices; |
750 | struct dm_raid_superblock *sb; | |
81f382f9 | 751 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
b12d437b JB |
752 | |
753 | sb = page_address(rdev->sb_page); | |
754 | failed_devices = le64_to_cpu(sb->failed_devices); | |
755 | ||
81f382f9 JB |
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); | |
b12d437b JB |
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 | */ | |
3cb03002 | 788 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
b12d437b JB |
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); | |
3aa3b2b2 JB |
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)) { | |
b12d437b JB |
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 | ||
fd01b88c | 833 | static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
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; | |
dafb20fa | 842 | struct md_rdev *r; |
b12d437b JB |
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 | */ | |
dafb20fa | 885 | rdev_for_each(r, mddev) { |
b12d437b | 886 | if (!test_bit(In_sync, &r->flags)) { |
3aa3b2b2 JB |
887 | DMINFO("Device %d specified for rebuild: " |
888 | "Clearing superblock", r->raid_disk); | |
b12d437b JB |
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 | */ | |
dafb20fa | 917 | rdev_for_each(r, mddev) { |
b12d437b JB |
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 | ||
fd01b88c | 950 | static int super_validate(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
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; | |
0447568f | 990 | struct raid_dev *dev; |
a9ad8526 | 991 | struct md_rdev *rdev, *tmp, *freshest; |
fd01b88c | 992 | struct mddev *mddev = &rs->md; |
b12d437b JB |
993 | |
994 | freshest = NULL; | |
a9ad8526 | 995 | rdev_for_each_safe(rdev, tmp, mddev) { |
761becff JB |
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 | ||
b12d437b JB |
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: | |
0447568f | 1021 | dev = container_of(rdev, struct raid_dev, rdev); |
55ebbb59 JB |
1022 | if (dev->meta_dev) |
1023 | dm_put_device(ti, dev->meta_dev); | |
0447568f | 1024 | |
55ebbb59 JB |
1025 | dev->meta_dev = NULL; |
1026 | rdev->meta_bdev = NULL; | |
0447568f | 1027 | |
55ebbb59 JB |
1028 | if (rdev->sb_page) |
1029 | put_page(rdev->sb_page); | |
0447568f | 1030 | |
55ebbb59 | 1031 | rdev->sb_page = NULL; |
0447568f | 1032 | |
55ebbb59 | 1033 | rdev->sb_loaded = 0; |
0447568f | 1034 | |
55ebbb59 JB |
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); | |
0447568f | 1043 | |
55ebbb59 JB |
1044 | dev->data_dev = NULL; |
1045 | rdev->bdev = NULL; | |
0447568f | 1046 | |
55ebbb59 | 1047 | list_del(&rdev->same_set); |
b12d437b JB |
1048 | } |
1049 | } | |
1050 | ||
1051 | if (!freshest) | |
1052 | return 0; | |
1053 | ||
55ebbb59 JB |
1054 | if (validate_raid_redundancy(rs)) { |
1055 | rs->ti->error = "Insufficient redundancy to activate array"; | |
1056 | return -EINVAL; | |
1057 | } | |
1058 | ||
b12d437b JB |
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 | ||
dafb20fa | 1067 | rdev_for_each(rdev, mddev) |
b12d437b JB |
1068 | if ((rdev != freshest) && super_validate(mddev, rdev)) |
1069 | return -EINVAL; | |
1070 | ||
1071 | return 0; | |
1072 | } | |
1073 | ||
9d09e663 N |
1074 | /* |
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 | * | |
9d09e663 N |
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 | ||
b12d437b JB |
1147 | rs->md.sync_super = super_sync; |
1148 | ret = analyse_superblocks(ti, rs); | |
1149 | if (ret) | |
1150 | goto bad; | |
1151 | ||
9d09e663 | 1152 | INIT_WORK(&rs->md.event_work, do_table_event); |
9d09e663 | 1153 | ti->private = rs; |
0ca93de9 | 1154 | ti->num_flush_requests = 1; |
9d09e663 N |
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 | ||
63f33b8d JB |
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 | } | |
9d09e663 | 1171 | rs->callbacks.congested_fn = raid_is_congested; |
9d09e663 N |
1172 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
1173 | ||
32737279 | 1174 | mddev_suspend(&rs->md); |
9d09e663 N |
1175 | return 0; |
1176 | ||
63f33b8d JB |
1177 | size_mismatch: |
1178 | md_stop(&rs->md); | |
9d09e663 N |
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 | ||
7de3ee57 | 1194 | static int raid_map(struct dm_target *ti, struct bio *bio) |
9d09e663 N |
1195 | { |
1196 | struct raid_set *rs = ti->private; | |
fd01b88c | 1197 | struct mddev *mddev = &rs->md; |
9d09e663 N |
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, | |
1f4e0ff0 | 1205 | unsigned status_flags, char *result, unsigned maxlen) |
9d09e663 N |
1206 | { |
1207 | struct raid_set *rs = ti->private; | |
1208 | unsigned raid_param_cnt = 1; /* at least 1 for chunksize */ | |
1209 | unsigned sz = 0; | |
2e727c3c | 1210 | int i, array_in_sync = 0; |
9d09e663 N |
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 | ||
9d09e663 N |
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 | ||
2e727c3c JB |
1222 | if (sync >= rs->md.resync_max_sectors) { |
1223 | array_in_sync = 1; | |
9d09e663 | 1224 | sync = rs->md.resync_max_sectors; |
2e727c3c JB |
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 | } | |
9d09e663 | 1251 | |
2e727c3c JB |
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 | */ | |
9d09e663 N |
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 */ | |
46bed2b5 | 1267 | for (i = 0; i < rs->md.raid_disks; i++) { |
13c87583 JB |
1268 | if ((rs->print_flags & DMPF_REBUILD) && |
1269 | rs->dev[i].data_dev && | |
9d09e663 | 1270 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
13c87583 | 1271 | raid_param_cnt += 2; /* for rebuilds */ |
46bed2b5 JB |
1272 | if (rs->dev[i].data_dev && |
1273 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1274 | raid_param_cnt += 2; | |
1275 | } | |
9d09e663 | 1276 | |
34f8ac6d | 1277 | raid_param_cnt += (hweight32(rs->print_flags & ~DMPF_REBUILD) * 2); |
9d09e663 N |
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++) | |
13c87583 JB |
1291 | if ((rs->print_flags & DMPF_REBUILD) && |
1292 | rs->dev[i].data_dev && | |
9d09e663 N |
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 | ||
46bed2b5 JB |
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 | ||
9d09e663 N |
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) { | |
d1688a6d | 1316 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1317 | |
1318 | /* convert from kiB to sectors */ | |
1319 | DMEMIT(" stripe_cache %d", | |
1320 | conf ? conf->max_nr_stripes * 2 : 0); | |
1321 | } | |
1322 | ||
c1084561 JB |
1323 | if (rs->print_flags & DMPF_REGION_SIZE) |
1324 | DMEMIT(" region_size %lu", | |
1325 | rs->md.bitmap_info.chunksize >> 9); | |
1326 | ||
63f33b8d JB |
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 | ||
9d09e663 N |
1334 | DMEMIT(" %d", rs->md.raid_disks); |
1335 | for (i = 0; i < rs->md.raid_disks; i++) { | |
b12d437b JB |
1336 | if (rs->dev[i].meta_dev) |
1337 | DMEMIT(" %s", rs->dev[i].meta_dev->name); | |
1338 | else | |
1339 | DMEMIT(" -"); | |
9d09e663 N |
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; | |
d1688a6d | 1372 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
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 | ||
81f382f9 | 1396 | set_bit(MD_CHANGE_DEVS, &rs->md.flags); |
34f8ac6d JB |
1397 | if (!rs->bitmap_loaded) { |
1398 | bitmap_load(&rs->md); | |
1399 | rs->bitmap_loaded = 1; | |
47525e59 | 1400 | } |
34f8ac6d | 1401 | |
47525e59 | 1402 | clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); |
9d09e663 N |
1403 | mddev_resume(&rs->md); |
1404 | } | |
1405 | ||
1406 | static struct target_type raid_target = { | |
1407 | .name = "raid", | |
55ebbb59 | 1408 | .version = {1, 4, 1}, |
9d09e663 N |
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"); | |
63f33b8d JB |
1435 | MODULE_ALIAS("dm-raid1"); |
1436 | MODULE_ALIAS("dm-raid10"); | |
9d09e663 N |
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"); |