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 | ||
fe5d2f4a JB |
94 | static char *raid10_md_layout_to_format(int layout) |
95 | { | |
96 | /* | |
97 | * Bit 16 and 17 stand for "offset" and "use_far_sets" | |
98 | * Refer to MD's raid10.c for details | |
99 | */ | |
100 | if ((layout & 0x10000) && (layout & 0x20000)) | |
101 | return "offset"; | |
102 | ||
103 | if ((layout & 0xFF) > 1) | |
104 | return "near"; | |
105 | ||
106 | return "far"; | |
107 | } | |
108 | ||
63f33b8d JB |
109 | static unsigned raid10_md_layout_to_copies(int layout) |
110 | { | |
fe5d2f4a JB |
111 | if ((layout & 0xFF) > 1) |
112 | return layout & 0xFF; | |
113 | return (layout >> 8) & 0xFF; | |
63f33b8d JB |
114 | } |
115 | ||
116 | static int raid10_format_to_md_layout(char *format, unsigned copies) | |
117 | { | |
fe5d2f4a JB |
118 | unsigned n = 1, f = 1; |
119 | ||
120 | if (!strcmp("near", format)) | |
121 | n = copies; | |
122 | else | |
123 | f = copies; | |
124 | ||
125 | if (!strcmp("offset", format)) | |
126 | return 0x30000 | (f << 8) | n; | |
127 | ||
128 | if (!strcmp("far", format)) | |
129 | return 0x20000 | (f << 8) | n; | |
130 | ||
131 | return (f << 8) | n; | |
63f33b8d JB |
132 | } |
133 | ||
9d09e663 N |
134 | static struct raid_type *get_raid_type(char *name) |
135 | { | |
136 | int i; | |
137 | ||
138 | for (i = 0; i < ARRAY_SIZE(raid_types); i++) | |
139 | if (!strcmp(raid_types[i].name, name)) | |
140 | return &raid_types[i]; | |
141 | ||
142 | return NULL; | |
143 | } | |
144 | ||
145 | static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs) | |
146 | { | |
147 | unsigned i; | |
148 | struct raid_set *rs; | |
9d09e663 N |
149 | |
150 | if (raid_devs <= raid_type->parity_devs) { | |
151 | ti->error = "Insufficient number of devices"; | |
152 | return ERR_PTR(-EINVAL); | |
153 | } | |
154 | ||
9d09e663 N |
155 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); |
156 | if (!rs) { | |
157 | ti->error = "Cannot allocate raid context"; | |
158 | return ERR_PTR(-ENOMEM); | |
159 | } | |
160 | ||
161 | mddev_init(&rs->md); | |
162 | ||
163 | rs->ti = ti; | |
164 | rs->raid_type = raid_type; | |
165 | rs->md.raid_disks = raid_devs; | |
166 | rs->md.level = raid_type->level; | |
167 | rs->md.new_level = rs->md.level; | |
9d09e663 N |
168 | rs->md.layout = raid_type->algorithm; |
169 | rs->md.new_layout = rs->md.layout; | |
170 | rs->md.delta_disks = 0; | |
171 | rs->md.recovery_cp = 0; | |
172 | ||
173 | for (i = 0; i < raid_devs; i++) | |
174 | md_rdev_init(&rs->dev[i].rdev); | |
175 | ||
176 | /* | |
177 | * Remaining items to be initialized by further RAID params: | |
178 | * rs->md.persistent | |
179 | * rs->md.external | |
180 | * rs->md.chunk_sectors | |
181 | * rs->md.new_chunk_sectors | |
c039c332 | 182 | * rs->md.dev_sectors |
9d09e663 N |
183 | */ |
184 | ||
185 | return rs; | |
186 | } | |
187 | ||
188 | static void context_free(struct raid_set *rs) | |
189 | { | |
190 | int i; | |
191 | ||
b12d437b JB |
192 | for (i = 0; i < rs->md.raid_disks; i++) { |
193 | if (rs->dev[i].meta_dev) | |
194 | dm_put_device(rs->ti, rs->dev[i].meta_dev); | |
545c8795 | 195 | md_rdev_clear(&rs->dev[i].rdev); |
9d09e663 N |
196 | if (rs->dev[i].data_dev) |
197 | dm_put_device(rs->ti, rs->dev[i].data_dev); | |
b12d437b | 198 | } |
9d09e663 N |
199 | |
200 | kfree(rs); | |
201 | } | |
202 | ||
203 | /* | |
204 | * For every device we have two words | |
205 | * <meta_dev>: meta device name or '-' if missing | |
206 | * <data_dev>: data device name or '-' if missing | |
207 | * | |
b12d437b JB |
208 | * The following are permitted: |
209 | * - - | |
210 | * - <data_dev> | |
211 | * <meta_dev> <data_dev> | |
212 | * | |
213 | * The following is not allowed: | |
214 | * <meta_dev> - | |
215 | * | |
216 | * This code parses those words. If there is a failure, | |
217 | * the caller must use context_free to unwind the operations. | |
9d09e663 N |
218 | */ |
219 | static int dev_parms(struct raid_set *rs, char **argv) | |
220 | { | |
221 | int i; | |
222 | int rebuild = 0; | |
223 | int metadata_available = 0; | |
224 | int ret = 0; | |
225 | ||
226 | for (i = 0; i < rs->md.raid_disks; i++, argv += 2) { | |
227 | rs->dev[i].rdev.raid_disk = i; | |
228 | ||
229 | rs->dev[i].meta_dev = NULL; | |
230 | rs->dev[i].data_dev = NULL; | |
231 | ||
232 | /* | |
233 | * There are no offsets, since there is a separate device | |
234 | * for data and metadata. | |
235 | */ | |
236 | rs->dev[i].rdev.data_offset = 0; | |
237 | rs->dev[i].rdev.mddev = &rs->md; | |
238 | ||
239 | if (strcmp(argv[0], "-")) { | |
b12d437b JB |
240 | ret = dm_get_device(rs->ti, argv[0], |
241 | dm_table_get_mode(rs->ti->table), | |
242 | &rs->dev[i].meta_dev); | |
243 | rs->ti->error = "RAID metadata device lookup failure"; | |
244 | if (ret) | |
245 | return ret; | |
246 | ||
247 | rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); | |
248 | if (!rs->dev[i].rdev.sb_page) | |
249 | return -ENOMEM; | |
9d09e663 N |
250 | } |
251 | ||
252 | if (!strcmp(argv[1], "-")) { | |
253 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && | |
254 | (!rs->dev[i].rdev.recovery_offset)) { | |
255 | rs->ti->error = "Drive designated for rebuild not specified"; | |
256 | return -EINVAL; | |
257 | } | |
258 | ||
b12d437b JB |
259 | rs->ti->error = "No data device supplied with metadata device"; |
260 | if (rs->dev[i].meta_dev) | |
261 | return -EINVAL; | |
262 | ||
9d09e663 N |
263 | continue; |
264 | } | |
265 | ||
266 | ret = dm_get_device(rs->ti, argv[1], | |
267 | dm_table_get_mode(rs->ti->table), | |
268 | &rs->dev[i].data_dev); | |
269 | if (ret) { | |
270 | rs->ti->error = "RAID device lookup failure"; | |
271 | return ret; | |
272 | } | |
273 | ||
b12d437b JB |
274 | if (rs->dev[i].meta_dev) { |
275 | metadata_available = 1; | |
276 | rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; | |
277 | } | |
9d09e663 N |
278 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
279 | list_add(&rs->dev[i].rdev.same_set, &rs->md.disks); | |
280 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
281 | rebuild++; | |
282 | } | |
283 | ||
284 | if (metadata_available) { | |
285 | rs->md.external = 0; | |
286 | rs->md.persistent = 1; | |
287 | rs->md.major_version = 2; | |
288 | } else if (rebuild && !rs->md.recovery_cp) { | |
289 | /* | |
290 | * Without metadata, we will not be able to tell if the array | |
291 | * is in-sync or not - we must assume it is not. Therefore, | |
292 | * it is impossible to rebuild a drive. | |
293 | * | |
294 | * Even if there is metadata, the on-disk information may | |
295 | * indicate that the array is not in-sync and it will then | |
296 | * fail at that time. | |
297 | * | |
298 | * User could specify 'nosync' option if desperate. | |
299 | */ | |
300 | DMERR("Unable to rebuild drive while array is not in-sync"); | |
301 | rs->ti->error = "RAID device lookup failure"; | |
302 | return -EINVAL; | |
303 | } | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
c1084561 JB |
308 | /* |
309 | * validate_region_size | |
310 | * @rs | |
311 | * @region_size: region size in sectors. If 0, pick a size (4MiB default). | |
312 | * | |
313 | * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). | |
314 | * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. | |
315 | * | |
316 | * Returns: 0 on success, -EINVAL on failure. | |
317 | */ | |
318 | static int validate_region_size(struct raid_set *rs, unsigned long region_size) | |
319 | { | |
320 | unsigned long min_region_size = rs->ti->len / (1 << 21); | |
321 | ||
322 | if (!region_size) { | |
323 | /* | |
324 | * Choose a reasonable default. All figures in sectors. | |
325 | */ | |
326 | if (min_region_size > (1 << 13)) { | |
3a0f9aae JB |
327 | /* If not a power of 2, make it the next power of 2 */ |
328 | if (min_region_size & (min_region_size - 1)) | |
329 | region_size = 1 << fls(region_size); | |
c1084561 JB |
330 | DMINFO("Choosing default region size of %lu sectors", |
331 | region_size); | |
c1084561 JB |
332 | } else { |
333 | DMINFO("Choosing default region size of 4MiB"); | |
334 | region_size = 1 << 13; /* sectors */ | |
335 | } | |
336 | } else { | |
337 | /* | |
338 | * Validate user-supplied value. | |
339 | */ | |
340 | if (region_size > rs->ti->len) { | |
341 | rs->ti->error = "Supplied region size is too large"; | |
342 | return -EINVAL; | |
343 | } | |
344 | ||
345 | if (region_size < min_region_size) { | |
346 | DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", | |
347 | region_size, min_region_size); | |
348 | rs->ti->error = "Supplied region size is too small"; | |
349 | return -EINVAL; | |
350 | } | |
351 | ||
352 | if (!is_power_of_2(region_size)) { | |
353 | rs->ti->error = "Region size is not a power of 2"; | |
354 | return -EINVAL; | |
355 | } | |
356 | ||
357 | if (region_size < rs->md.chunk_sectors) { | |
358 | rs->ti->error = "Region size is smaller than the chunk size"; | |
359 | return -EINVAL; | |
360 | } | |
361 | } | |
362 | ||
363 | /* | |
364 | * Convert sectors to bytes. | |
365 | */ | |
366 | rs->md.bitmap_info.chunksize = (region_size << 9); | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
eb649123 | 371 | /* |
55ebbb59 | 372 | * validate_raid_redundancy |
eb649123 JB |
373 | * @rs |
374 | * | |
55ebbb59 JB |
375 | * Determine if there are enough devices in the array that haven't |
376 | * failed (or are being rebuilt) to form a usable array. | |
eb649123 JB |
377 | * |
378 | * Returns: 0 on success, -EINVAL on failure. | |
379 | */ | |
55ebbb59 | 380 | static int validate_raid_redundancy(struct raid_set *rs) |
eb649123 JB |
381 | { |
382 | unsigned i, rebuild_cnt = 0; | |
4ec1e369 | 383 | unsigned rebuilds_per_group, copies, d; |
fe5d2f4a | 384 | unsigned group_size, last_group_start; |
eb649123 | 385 | |
eb649123 | 386 | for (i = 0; i < rs->md.raid_disks; i++) |
55ebbb59 JB |
387 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || |
388 | !rs->dev[i].rdev.sb_page) | |
eb649123 JB |
389 | rebuild_cnt++; |
390 | ||
391 | switch (rs->raid_type->level) { | |
392 | case 1: | |
393 | if (rebuild_cnt >= rs->md.raid_disks) | |
394 | goto too_many; | |
395 | break; | |
396 | case 4: | |
397 | case 5: | |
398 | case 6: | |
399 | if (rebuild_cnt > rs->raid_type->parity_devs) | |
400 | goto too_many; | |
401 | break; | |
402 | case 10: | |
4ec1e369 JB |
403 | copies = raid10_md_layout_to_copies(rs->md.layout); |
404 | if (rebuild_cnt < copies) | |
405 | break; | |
406 | ||
407 | /* | |
408 | * It is possible to have a higher rebuild count for RAID10, | |
409 | * as long as the failed devices occur in different mirror | |
410 | * groups (i.e. different stripes). | |
411 | * | |
4ec1e369 JB |
412 | * When checking "near" format, make sure no adjacent devices |
413 | * have failed beyond what can be handled. In addition to the | |
414 | * simple case where the number of devices is a multiple of the | |
415 | * number of copies, we must also handle cases where the number | |
416 | * of devices is not a multiple of the number of copies. | |
417 | * E.g. dev1 dev2 dev3 dev4 dev5 | |
418 | * A A B B C | |
419 | * C D D E E | |
420 | */ | |
fe5d2f4a JB |
421 | if (!strcmp("near", raid10_md_layout_to_format(rs->md.layout))) { |
422 | for (i = 0; i < rs->md.raid_disks * copies; i++) { | |
423 | if (!(i % copies)) | |
424 | rebuilds_per_group = 0; | |
425 | d = i % rs->md.raid_disks; | |
426 | if ((!rs->dev[d].rdev.sb_page || | |
427 | !test_bit(In_sync, &rs->dev[d].rdev.flags)) && | |
428 | (++rebuilds_per_group >= copies)) | |
429 | goto too_many; | |
430 | } | |
431 | break; | |
432 | } | |
433 | ||
434 | /* | |
435 | * When checking "far" and "offset" formats, we need to ensure | |
436 | * that the device that holds its copy is not also dead or | |
437 | * being rebuilt. (Note that "far" and "offset" formats only | |
438 | * support two copies right now. These formats also only ever | |
439 | * use the 'use_far_sets' variant.) | |
440 | * | |
441 | * This check is somewhat complicated by the need to account | |
442 | * for arrays that are not a multiple of (far) copies. This | |
443 | * results in the need to treat the last (potentially larger) | |
444 | * set differently. | |
445 | */ | |
446 | group_size = (rs->md.raid_disks / copies); | |
447 | last_group_start = (rs->md.raid_disks / group_size) - 1; | |
448 | last_group_start *= group_size; | |
449 | for (i = 0; i < rs->md.raid_disks; i++) { | |
450 | if (!(i % copies) && !(i > last_group_start)) | |
55ebbb59 | 451 | rebuilds_per_group = 0; |
fe5d2f4a JB |
452 | if ((!rs->dev[i].rdev.sb_page || |
453 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) && | |
4ec1e369 | 454 | (++rebuilds_per_group >= copies)) |
fe5d2f4a | 455 | goto too_many; |
4ec1e369 JB |
456 | } |
457 | break; | |
eb649123 | 458 | default: |
55ebbb59 JB |
459 | if (rebuild_cnt) |
460 | return -EINVAL; | |
eb649123 JB |
461 | } |
462 | ||
463 | return 0; | |
464 | ||
465 | too_many: | |
eb649123 JB |
466 | return -EINVAL; |
467 | } | |
468 | ||
9d09e663 N |
469 | /* |
470 | * Possible arguments are... | |
9d09e663 N |
471 | * <chunk_size> [optional_args] |
472 | * | |
32737279 JB |
473 | * Argument definitions |
474 | * <chunk_size> The number of sectors per disk that | |
475 | * will form the "stripe" | |
476 | * [[no]sync] Force or prevent recovery of the | |
477 | * entire array | |
9d09e663 | 478 | * [rebuild <idx>] Rebuild the drive indicated by the index |
32737279 JB |
479 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
480 | * clear bits | |
9d09e663 N |
481 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
482 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization | |
46bed2b5 | 483 | * [write_mostly <idx>] Indicate a write mostly drive via index |
9d09e663 N |
484 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
485 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs | |
c1084561 | 486 | * [region_size <sectors>] Defines granularity of bitmap |
63f33b8d JB |
487 | * |
488 | * RAID10-only options: | |
489 | * [raid10_copies <# copies>] Number of copies. (Default: 2) | |
fe5d2f4a | 490 | * [raid10_format <near|far|offset>] Layout algorithm. (Default: near) |
9d09e663 N |
491 | */ |
492 | static int parse_raid_params(struct raid_set *rs, char **argv, | |
493 | unsigned num_raid_params) | |
494 | { | |
63f33b8d JB |
495 | char *raid10_format = "near"; |
496 | unsigned raid10_copies = 2; | |
eb649123 | 497 | unsigned i; |
c1084561 | 498 | unsigned long value, region_size = 0; |
c039c332 | 499 | sector_t sectors_per_dev = rs->ti->len; |
542f9038 | 500 | sector_t max_io_len; |
9d09e663 N |
501 | char *key; |
502 | ||
503 | /* | |
504 | * First, parse the in-order required arguments | |
32737279 | 505 | * "chunk_size" is the only argument of this type. |
9d09e663 | 506 | */ |
32737279 | 507 | if ((strict_strtoul(argv[0], 10, &value) < 0)) { |
9d09e663 N |
508 | rs->ti->error = "Bad chunk size"; |
509 | return -EINVAL; | |
32737279 JB |
510 | } else if (rs->raid_type->level == 1) { |
511 | if (value) | |
512 | DMERR("Ignoring chunk size parameter for RAID 1"); | |
513 | value = 0; | |
514 | } else if (!is_power_of_2(value)) { | |
515 | rs->ti->error = "Chunk size must be a power of 2"; | |
516 | return -EINVAL; | |
517 | } else if (value < 8) { | |
518 | rs->ti->error = "Chunk size value is too small"; | |
519 | return -EINVAL; | |
9d09e663 N |
520 | } |
521 | ||
522 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; | |
523 | argv++; | |
524 | num_raid_params--; | |
525 | ||
526 | /* | |
b12d437b JB |
527 | * We set each individual device as In_sync with a completed |
528 | * 'recovery_offset'. If there has been a device failure or | |
529 | * replacement then one of the following cases applies: | |
530 | * | |
531 | * 1) User specifies 'rebuild'. | |
532 | * - Device is reset when param is read. | |
533 | * 2) A new device is supplied. | |
534 | * - No matching superblock found, resets device. | |
535 | * 3) Device failure was transient and returns on reload. | |
536 | * - Failure noticed, resets device for bitmap replay. | |
537 | * 4) Device hadn't completed recovery after previous failure. | |
538 | * - Superblock is read and overrides recovery_offset. | |
539 | * | |
540 | * What is found in the superblocks of the devices is always | |
541 | * authoritative, unless 'rebuild' or '[no]sync' was specified. | |
9d09e663 | 542 | */ |
b12d437b | 543 | for (i = 0; i < rs->md.raid_disks; i++) { |
9d09e663 | 544 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
b12d437b JB |
545 | rs->dev[i].rdev.recovery_offset = MaxSector; |
546 | } | |
9d09e663 | 547 | |
b12d437b JB |
548 | /* |
549 | * Second, parse the unordered optional arguments | |
550 | */ | |
9d09e663 | 551 | for (i = 0; i < num_raid_params; i++) { |
13c87583 | 552 | if (!strcasecmp(argv[i], "nosync")) { |
9d09e663 N |
553 | rs->md.recovery_cp = MaxSector; |
554 | rs->print_flags |= DMPF_NOSYNC; | |
9d09e663 N |
555 | continue; |
556 | } | |
13c87583 | 557 | if (!strcasecmp(argv[i], "sync")) { |
9d09e663 N |
558 | rs->md.recovery_cp = 0; |
559 | rs->print_flags |= DMPF_SYNC; | |
9d09e663 N |
560 | continue; |
561 | } | |
562 | ||
563 | /* The rest of the optional arguments come in key/value pairs */ | |
564 | if ((i + 1) >= num_raid_params) { | |
565 | rs->ti->error = "Wrong number of raid parameters given"; | |
566 | return -EINVAL; | |
567 | } | |
568 | ||
569 | key = argv[i++]; | |
63f33b8d JB |
570 | |
571 | /* Parameters that take a string value are checked here. */ | |
572 | if (!strcasecmp(key, "raid10_format")) { | |
573 | if (rs->raid_type->level != 10) { | |
574 | rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type"; | |
575 | return -EINVAL; | |
576 | } | |
fe5d2f4a JB |
577 | if (strcmp("near", argv[i]) && |
578 | strcmp("far", argv[i]) && | |
579 | strcmp("offset", argv[i])) { | |
63f33b8d JB |
580 | rs->ti->error = "Invalid 'raid10_format' value given"; |
581 | return -EINVAL; | |
582 | } | |
583 | raid10_format = argv[i]; | |
584 | rs->print_flags |= DMPF_RAID10_FORMAT; | |
585 | continue; | |
586 | } | |
587 | ||
9d09e663 N |
588 | if (strict_strtoul(argv[i], 10, &value) < 0) { |
589 | rs->ti->error = "Bad numerical argument given in raid params"; | |
590 | return -EINVAL; | |
591 | } | |
592 | ||
63f33b8d | 593 | /* Parameters that take a numeric value are checked here */ |
13c87583 | 594 | if (!strcasecmp(key, "rebuild")) { |
7386199c | 595 | if (value >= rs->md.raid_disks) { |
9d09e663 N |
596 | rs->ti->error = "Invalid rebuild index given"; |
597 | return -EINVAL; | |
598 | } | |
599 | clear_bit(In_sync, &rs->dev[value].rdev.flags); | |
600 | rs->dev[value].rdev.recovery_offset = 0; | |
13c87583 | 601 | rs->print_flags |= DMPF_REBUILD; |
46bed2b5 JB |
602 | } else if (!strcasecmp(key, "write_mostly")) { |
603 | if (rs->raid_type->level != 1) { | |
604 | rs->ti->error = "write_mostly option is only valid for RAID1"; | |
605 | return -EINVAL; | |
606 | } | |
82324809 | 607 | if (value >= rs->md.raid_disks) { |
46bed2b5 JB |
608 | rs->ti->error = "Invalid write_mostly drive index given"; |
609 | return -EINVAL; | |
610 | } | |
611 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); | |
13c87583 | 612 | } else if (!strcasecmp(key, "max_write_behind")) { |
46bed2b5 JB |
613 | if (rs->raid_type->level != 1) { |
614 | rs->ti->error = "max_write_behind option is only valid for RAID1"; | |
615 | return -EINVAL; | |
616 | } | |
9d09e663 N |
617 | rs->print_flags |= DMPF_MAX_WRITE_BEHIND; |
618 | ||
619 | /* | |
620 | * In device-mapper, we specify things in sectors, but | |
621 | * MD records this value in kB | |
622 | */ | |
623 | value /= 2; | |
624 | if (value > COUNTER_MAX) { | |
625 | rs->ti->error = "Max write-behind limit out of range"; | |
626 | return -EINVAL; | |
627 | } | |
628 | rs->md.bitmap_info.max_write_behind = value; | |
13c87583 | 629 | } else if (!strcasecmp(key, "daemon_sleep")) { |
9d09e663 N |
630 | rs->print_flags |= DMPF_DAEMON_SLEEP; |
631 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) { | |
632 | rs->ti->error = "daemon sleep period out of range"; | |
633 | return -EINVAL; | |
634 | } | |
635 | rs->md.bitmap_info.daemon_sleep = value; | |
13c87583 | 636 | } else if (!strcasecmp(key, "stripe_cache")) { |
9d09e663 N |
637 | rs->print_flags |= DMPF_STRIPE_CACHE; |
638 | ||
639 | /* | |
640 | * In device-mapper, we specify things in sectors, but | |
641 | * MD records this value in kB | |
642 | */ | |
643 | value /= 2; | |
644 | ||
63f33b8d JB |
645 | if ((rs->raid_type->level != 5) && |
646 | (rs->raid_type->level != 6)) { | |
9d09e663 N |
647 | rs->ti->error = "Inappropriate argument: stripe_cache"; |
648 | return -EINVAL; | |
649 | } | |
650 | if (raid5_set_cache_size(&rs->md, (int)value)) { | |
651 | rs->ti->error = "Bad stripe_cache size"; | |
652 | return -EINVAL; | |
653 | } | |
13c87583 | 654 | } else if (!strcasecmp(key, "min_recovery_rate")) { |
9d09e663 N |
655 | rs->print_flags |= DMPF_MIN_RECOVERY_RATE; |
656 | if (value > INT_MAX) { | |
657 | rs->ti->error = "min_recovery_rate out of range"; | |
658 | return -EINVAL; | |
659 | } | |
660 | rs->md.sync_speed_min = (int)value; | |
13c87583 | 661 | } else if (!strcasecmp(key, "max_recovery_rate")) { |
9d09e663 N |
662 | rs->print_flags |= DMPF_MAX_RECOVERY_RATE; |
663 | if (value > INT_MAX) { | |
664 | rs->ti->error = "max_recovery_rate out of range"; | |
665 | return -EINVAL; | |
666 | } | |
667 | rs->md.sync_speed_max = (int)value; | |
c1084561 JB |
668 | } else if (!strcasecmp(key, "region_size")) { |
669 | rs->print_flags |= DMPF_REGION_SIZE; | |
670 | region_size = value; | |
63f33b8d JB |
671 | } else if (!strcasecmp(key, "raid10_copies") && |
672 | (rs->raid_type->level == 10)) { | |
673 | if ((value < 2) || (value > 0xFF)) { | |
674 | rs->ti->error = "Bad value for 'raid10_copies'"; | |
675 | return -EINVAL; | |
676 | } | |
677 | rs->print_flags |= DMPF_RAID10_COPIES; | |
678 | raid10_copies = value; | |
9d09e663 N |
679 | } else { |
680 | DMERR("Unable to parse RAID parameter: %s", key); | |
681 | rs->ti->error = "Unable to parse RAID parameters"; | |
682 | return -EINVAL; | |
683 | } | |
684 | } | |
685 | ||
c1084561 JB |
686 | if (validate_region_size(rs, region_size)) |
687 | return -EINVAL; | |
688 | ||
689 | if (rs->md.chunk_sectors) | |
542f9038 | 690 | max_io_len = rs->md.chunk_sectors; |
c1084561 | 691 | else |
542f9038 | 692 | max_io_len = region_size; |
c1084561 | 693 | |
542f9038 MS |
694 | if (dm_set_target_max_io_len(rs->ti, max_io_len)) |
695 | return -EINVAL; | |
32737279 | 696 | |
63f33b8d JB |
697 | if (rs->raid_type->level == 10) { |
698 | if (raid10_copies > rs->md.raid_disks) { | |
699 | rs->ti->error = "Not enough devices to satisfy specification"; | |
700 | return -EINVAL; | |
701 | } | |
702 | ||
fe5d2f4a JB |
703 | /* |
704 | * If the format is not "near", we only support | |
705 | * two copies at the moment. | |
706 | */ | |
707 | if (strcmp("near", raid10_format) && (raid10_copies > 2)) { | |
708 | rs->ti->error = "Too many copies for given RAID10 format."; | |
709 | return -EINVAL; | |
710 | } | |
711 | ||
63f33b8d JB |
712 | /* (Len * #mirrors) / #devices */ |
713 | sectors_per_dev = rs->ti->len * raid10_copies; | |
714 | sector_div(sectors_per_dev, rs->md.raid_disks); | |
715 | ||
716 | rs->md.layout = raid10_format_to_md_layout(raid10_format, | |
717 | raid10_copies); | |
718 | rs->md.new_layout = rs->md.layout; | |
719 | } else if ((rs->raid_type->level > 1) && | |
720 | sector_div(sectors_per_dev, | |
721 | (rs->md.raid_disks - rs->raid_type->parity_devs))) { | |
c039c332 JB |
722 | rs->ti->error = "Target length not divisible by number of data devices"; |
723 | return -EINVAL; | |
724 | } | |
725 | rs->md.dev_sectors = sectors_per_dev; | |
726 | ||
9d09e663 N |
727 | /* Assume there are no metadata devices until the drives are parsed */ |
728 | rs->md.persistent = 0; | |
729 | rs->md.external = 1; | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | static void do_table_event(struct work_struct *ws) | |
735 | { | |
736 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); | |
737 | ||
738 | dm_table_event(rs->ti->table); | |
739 | } | |
740 | ||
741 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) | |
742 | { | |
743 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); | |
744 | ||
32737279 JB |
745 | if (rs->raid_type->level == 1) |
746 | return md_raid1_congested(&rs->md, bits); | |
747 | ||
63f33b8d JB |
748 | if (rs->raid_type->level == 10) |
749 | return md_raid10_congested(&rs->md, bits); | |
750 | ||
9d09e663 N |
751 | return md_raid5_congested(&rs->md, bits); |
752 | } | |
753 | ||
b12d437b JB |
754 | /* |
755 | * This structure is never routinely used by userspace, unlike md superblocks. | |
756 | * Devices with this superblock should only ever be accessed via device-mapper. | |
757 | */ | |
758 | #define DM_RAID_MAGIC 0x64526D44 | |
759 | struct dm_raid_superblock { | |
760 | __le32 magic; /* "DmRd" */ | |
761 | __le32 features; /* Used to indicate possible future changes */ | |
762 | ||
763 | __le32 num_devices; /* Number of devices in this array. (Max 64) */ | |
764 | __le32 array_position; /* The position of this drive in the array */ | |
765 | ||
766 | __le64 events; /* Incremented by md when superblock updated */ | |
767 | __le64 failed_devices; /* Bit field of devices to indicate failures */ | |
768 | ||
769 | /* | |
770 | * This offset tracks the progress of the repair or replacement of | |
771 | * an individual drive. | |
772 | */ | |
773 | __le64 disk_recovery_offset; | |
774 | ||
775 | /* | |
776 | * This offset tracks the progress of the initial array | |
777 | * synchronisation/parity calculation. | |
778 | */ | |
779 | __le64 array_resync_offset; | |
780 | ||
781 | /* | |
782 | * RAID characteristics | |
783 | */ | |
784 | __le32 level; | |
785 | __le32 layout; | |
786 | __le32 stripe_sectors; | |
787 | ||
788 | __u8 pad[452]; /* Round struct to 512 bytes. */ | |
789 | /* Always set to 0 when writing. */ | |
790 | } __packed; | |
791 | ||
3cb03002 | 792 | static int read_disk_sb(struct md_rdev *rdev, int size) |
b12d437b JB |
793 | { |
794 | BUG_ON(!rdev->sb_page); | |
795 | ||
796 | if (rdev->sb_loaded) | |
797 | return 0; | |
798 | ||
799 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) { | |
0447568f JB |
800 | DMERR("Failed to read superblock of device at position %d", |
801 | rdev->raid_disk); | |
c32fb9e7 | 802 | md_error(rdev->mddev, rdev); |
b12d437b JB |
803 | return -EINVAL; |
804 | } | |
805 | ||
806 | rdev->sb_loaded = 1; | |
807 | ||
808 | return 0; | |
809 | } | |
810 | ||
fd01b88c | 811 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b | 812 | { |
81f382f9 | 813 | int i; |
b12d437b JB |
814 | uint64_t failed_devices; |
815 | struct dm_raid_superblock *sb; | |
81f382f9 | 816 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
b12d437b JB |
817 | |
818 | sb = page_address(rdev->sb_page); | |
819 | failed_devices = le64_to_cpu(sb->failed_devices); | |
820 | ||
81f382f9 JB |
821 | for (i = 0; i < mddev->raid_disks; i++) |
822 | if (!rs->dev[i].data_dev || | |
823 | test_bit(Faulty, &(rs->dev[i].rdev.flags))) | |
824 | failed_devices |= (1ULL << i); | |
b12d437b JB |
825 | |
826 | memset(sb, 0, sizeof(*sb)); | |
827 | ||
828 | sb->magic = cpu_to_le32(DM_RAID_MAGIC); | |
829 | sb->features = cpu_to_le32(0); /* No features yet */ | |
830 | ||
831 | sb->num_devices = cpu_to_le32(mddev->raid_disks); | |
832 | sb->array_position = cpu_to_le32(rdev->raid_disk); | |
833 | ||
834 | sb->events = cpu_to_le64(mddev->events); | |
835 | sb->failed_devices = cpu_to_le64(failed_devices); | |
836 | ||
837 | sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
838 | sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); | |
839 | ||
840 | sb->level = cpu_to_le32(mddev->level); | |
841 | sb->layout = cpu_to_le32(mddev->layout); | |
842 | sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); | |
843 | } | |
844 | ||
845 | /* | |
846 | * super_load | |
847 | * | |
848 | * This function creates a superblock if one is not found on the device | |
849 | * and will decide which superblock to use if there's a choice. | |
850 | * | |
851 | * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise | |
852 | */ | |
3cb03002 | 853 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
b12d437b JB |
854 | { |
855 | int ret; | |
856 | struct dm_raid_superblock *sb; | |
857 | struct dm_raid_superblock *refsb; | |
858 | uint64_t events_sb, events_refsb; | |
859 | ||
860 | rdev->sb_start = 0; | |
861 | rdev->sb_size = sizeof(*sb); | |
862 | ||
863 | ret = read_disk_sb(rdev, rdev->sb_size); | |
864 | if (ret) | |
865 | return ret; | |
866 | ||
867 | sb = page_address(rdev->sb_page); | |
3aa3b2b2 JB |
868 | |
869 | /* | |
870 | * Two cases that we want to write new superblocks and rebuild: | |
871 | * 1) New device (no matching magic number) | |
872 | * 2) Device specified for rebuild (!In_sync w/ offset == 0) | |
873 | */ | |
874 | if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) || | |
875 | (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) { | |
b12d437b JB |
876 | super_sync(rdev->mddev, rdev); |
877 | ||
878 | set_bit(FirstUse, &rdev->flags); | |
879 | ||
880 | /* Force writing of superblocks to disk */ | |
881 | set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags); | |
882 | ||
883 | /* Any superblock is better than none, choose that if given */ | |
884 | return refdev ? 0 : 1; | |
885 | } | |
886 | ||
887 | if (!refdev) | |
888 | return 1; | |
889 | ||
890 | events_sb = le64_to_cpu(sb->events); | |
891 | ||
892 | refsb = page_address(refdev->sb_page); | |
893 | events_refsb = le64_to_cpu(refsb->events); | |
894 | ||
895 | return (events_sb > events_refsb) ? 1 : 0; | |
896 | } | |
897 | ||
fd01b88c | 898 | static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
899 | { |
900 | int role; | |
901 | struct raid_set *rs = container_of(mddev, struct raid_set, md); | |
902 | uint64_t events_sb; | |
903 | uint64_t failed_devices; | |
904 | struct dm_raid_superblock *sb; | |
905 | uint32_t new_devs = 0; | |
906 | uint32_t rebuilds = 0; | |
dafb20fa | 907 | struct md_rdev *r; |
b12d437b JB |
908 | struct dm_raid_superblock *sb2; |
909 | ||
910 | sb = page_address(rdev->sb_page); | |
911 | events_sb = le64_to_cpu(sb->events); | |
912 | failed_devices = le64_to_cpu(sb->failed_devices); | |
913 | ||
914 | /* | |
915 | * Initialise to 1 if this is a new superblock. | |
916 | */ | |
917 | mddev->events = events_sb ? : 1; | |
918 | ||
919 | /* | |
920 | * Reshaping is not currently allowed | |
921 | */ | |
fe5d2f4a JB |
922 | if (le32_to_cpu(sb->level) != mddev->level) { |
923 | DMERR("Reshaping arrays not yet supported. (RAID level change)"); | |
924 | return -EINVAL; | |
925 | } | |
926 | if (le32_to_cpu(sb->layout) != mddev->layout) { | |
927 | DMERR("Reshaping arrays not yet supported. (RAID layout change)"); | |
928 | DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout); | |
929 | DMERR(" Old layout: %s w/ %d copies", | |
930 | raid10_md_layout_to_format(le32_to_cpu(sb->layout)), | |
931 | raid10_md_layout_to_copies(le32_to_cpu(sb->layout))); | |
932 | DMERR(" New layout: %s w/ %d copies", | |
933 | raid10_md_layout_to_format(mddev->layout), | |
934 | raid10_md_layout_to_copies(mddev->layout)); | |
935 | return -EINVAL; | |
936 | } | |
937 | if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) { | |
938 | DMERR("Reshaping arrays not yet supported. (stripe sectors change)"); | |
b12d437b JB |
939 | return -EINVAL; |
940 | } | |
941 | ||
942 | /* We can only change the number of devices in RAID1 right now */ | |
943 | if ((rs->raid_type->level != 1) && | |
944 | (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) { | |
fe5d2f4a | 945 | DMERR("Reshaping arrays not yet supported. (device count change)"); |
b12d437b JB |
946 | return -EINVAL; |
947 | } | |
948 | ||
949 | if (!(rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))) | |
950 | mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); | |
951 | ||
952 | /* | |
953 | * During load, we set FirstUse if a new superblock was written. | |
954 | * There are two reasons we might not have a superblock: | |
955 | * 1) The array is brand new - in which case, all of the | |
956 | * devices must have their In_sync bit set. Also, | |
957 | * recovery_cp must be 0, unless forced. | |
958 | * 2) This is a new device being added to an old array | |
959 | * and the new device needs to be rebuilt - in which | |
960 | * case the In_sync bit will /not/ be set and | |
961 | * recovery_cp must be MaxSector. | |
962 | */ | |
dafb20fa | 963 | rdev_for_each(r, mddev) { |
b12d437b | 964 | if (!test_bit(In_sync, &r->flags)) { |
3aa3b2b2 JB |
965 | DMINFO("Device %d specified for rebuild: " |
966 | "Clearing superblock", r->raid_disk); | |
b12d437b JB |
967 | rebuilds++; |
968 | } else if (test_bit(FirstUse, &r->flags)) | |
969 | new_devs++; | |
970 | } | |
971 | ||
972 | if (!rebuilds) { | |
973 | if (new_devs == mddev->raid_disks) { | |
974 | DMINFO("Superblocks created for new array"); | |
975 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); | |
976 | } else if (new_devs) { | |
977 | DMERR("New device injected " | |
978 | "into existing array without 'rebuild' " | |
979 | "parameter specified"); | |
980 | return -EINVAL; | |
981 | } | |
982 | } else if (new_devs) { | |
983 | DMERR("'rebuild' devices cannot be " | |
984 | "injected into an array with other first-time devices"); | |
985 | return -EINVAL; | |
986 | } else if (mddev->recovery_cp != MaxSector) { | |
987 | DMERR("'rebuild' specified while array is not in-sync"); | |
988 | return -EINVAL; | |
989 | } | |
990 | ||
991 | /* | |
992 | * Now we set the Faulty bit for those devices that are | |
993 | * recorded in the superblock as failed. | |
994 | */ | |
dafb20fa | 995 | rdev_for_each(r, mddev) { |
b12d437b JB |
996 | if (!r->sb_page) |
997 | continue; | |
998 | sb2 = page_address(r->sb_page); | |
999 | sb2->failed_devices = 0; | |
1000 | ||
1001 | /* | |
1002 | * Check for any device re-ordering. | |
1003 | */ | |
1004 | if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) { | |
1005 | role = le32_to_cpu(sb2->array_position); | |
1006 | if (role != r->raid_disk) { | |
1007 | if (rs->raid_type->level != 1) { | |
1008 | rs->ti->error = "Cannot change device " | |
1009 | "positions in RAID array"; | |
1010 | return -EINVAL; | |
1011 | } | |
1012 | DMINFO("RAID1 device #%d now at position #%d", | |
1013 | role, r->raid_disk); | |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Partial recovery is performed on | |
1018 | * returning failed devices. | |
1019 | */ | |
1020 | if (failed_devices & (1 << role)) | |
1021 | set_bit(Faulty, &r->flags); | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
fd01b88c | 1028 | static int super_validate(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
1029 | { |
1030 | struct dm_raid_superblock *sb = page_address(rdev->sb_page); | |
1031 | ||
1032 | /* | |
1033 | * If mddev->events is not set, we know we have not yet initialized | |
1034 | * the array. | |
1035 | */ | |
1036 | if (!mddev->events && super_init_validation(mddev, rdev)) | |
1037 | return -EINVAL; | |
1038 | ||
1039 | mddev->bitmap_info.offset = 4096 >> 9; /* Enable bitmap creation */ | |
1040 | rdev->mddev->bitmap_info.default_offset = 4096 >> 9; | |
1041 | if (!test_bit(FirstUse, &rdev->flags)) { | |
1042 | rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); | |
1043 | if (rdev->recovery_offset != MaxSector) | |
1044 | clear_bit(In_sync, &rdev->flags); | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * If a device comes back, set it as not In_sync and no longer faulty. | |
1049 | */ | |
1050 | if (test_bit(Faulty, &rdev->flags)) { | |
1051 | clear_bit(Faulty, &rdev->flags); | |
1052 | clear_bit(In_sync, &rdev->flags); | |
1053 | rdev->saved_raid_disk = rdev->raid_disk; | |
1054 | rdev->recovery_offset = 0; | |
1055 | } | |
1056 | ||
1057 | clear_bit(FirstUse, &rdev->flags); | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * Analyse superblocks and select the freshest. | |
1064 | */ | |
1065 | static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) | |
1066 | { | |
1067 | int ret; | |
0447568f | 1068 | struct raid_dev *dev; |
a9ad8526 | 1069 | struct md_rdev *rdev, *tmp, *freshest; |
fd01b88c | 1070 | struct mddev *mddev = &rs->md; |
b12d437b JB |
1071 | |
1072 | freshest = NULL; | |
a9ad8526 | 1073 | rdev_for_each_safe(rdev, tmp, mddev) { |
761becff JB |
1074 | /* |
1075 | * Skipping super_load due to DMPF_SYNC will cause | |
1076 | * the array to undergo initialization again as | |
1077 | * though it were new. This is the intended effect | |
1078 | * of the "sync" directive. | |
1079 | * | |
1080 | * When reshaping capability is added, we must ensure | |
1081 | * that the "sync" directive is disallowed during the | |
1082 | * reshape. | |
1083 | */ | |
1084 | if (rs->print_flags & DMPF_SYNC) | |
1085 | continue; | |
1086 | ||
b12d437b JB |
1087 | if (!rdev->meta_bdev) |
1088 | continue; | |
1089 | ||
1090 | ret = super_load(rdev, freshest); | |
1091 | ||
1092 | switch (ret) { | |
1093 | case 1: | |
1094 | freshest = rdev; | |
1095 | break; | |
1096 | case 0: | |
1097 | break; | |
1098 | default: | |
0447568f | 1099 | dev = container_of(rdev, struct raid_dev, rdev); |
55ebbb59 JB |
1100 | if (dev->meta_dev) |
1101 | dm_put_device(ti, dev->meta_dev); | |
0447568f | 1102 | |
55ebbb59 JB |
1103 | dev->meta_dev = NULL; |
1104 | rdev->meta_bdev = NULL; | |
0447568f | 1105 | |
55ebbb59 JB |
1106 | if (rdev->sb_page) |
1107 | put_page(rdev->sb_page); | |
0447568f | 1108 | |
55ebbb59 | 1109 | rdev->sb_page = NULL; |
0447568f | 1110 | |
55ebbb59 | 1111 | rdev->sb_loaded = 0; |
0447568f | 1112 | |
55ebbb59 JB |
1113 | /* |
1114 | * We might be able to salvage the data device | |
1115 | * even though the meta device has failed. For | |
1116 | * now, we behave as though '- -' had been | |
1117 | * set for this device in the table. | |
1118 | */ | |
1119 | if (dev->data_dev) | |
1120 | dm_put_device(ti, dev->data_dev); | |
0447568f | 1121 | |
55ebbb59 JB |
1122 | dev->data_dev = NULL; |
1123 | rdev->bdev = NULL; | |
0447568f | 1124 | |
55ebbb59 | 1125 | list_del(&rdev->same_set); |
b12d437b JB |
1126 | } |
1127 | } | |
1128 | ||
1129 | if (!freshest) | |
1130 | return 0; | |
1131 | ||
55ebbb59 JB |
1132 | if (validate_raid_redundancy(rs)) { |
1133 | rs->ti->error = "Insufficient redundancy to activate array"; | |
1134 | return -EINVAL; | |
1135 | } | |
1136 | ||
b12d437b JB |
1137 | /* |
1138 | * Validation of the freshest device provides the source of | |
1139 | * validation for the remaining devices. | |
1140 | */ | |
1141 | ti->error = "Unable to assemble array: Invalid superblocks"; | |
1142 | if (super_validate(mddev, freshest)) | |
1143 | return -EINVAL; | |
1144 | ||
dafb20fa | 1145 | rdev_for_each(rdev, mddev) |
b12d437b JB |
1146 | if ((rdev != freshest) && super_validate(mddev, rdev)) |
1147 | return -EINVAL; | |
1148 | ||
1149 | return 0; | |
1150 | } | |
1151 | ||
9d09e663 N |
1152 | /* |
1153 | * Construct a RAID4/5/6 mapping: | |
1154 | * Args: | |
1155 | * <raid_type> <#raid_params> <raid_params> \ | |
1156 | * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> } | |
1157 | * | |
9d09e663 N |
1158 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
1159 | * details on possible <raid_params>. | |
1160 | */ | |
1161 | static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) | |
1162 | { | |
1163 | int ret; | |
1164 | struct raid_type *rt; | |
1165 | unsigned long num_raid_params, num_raid_devs; | |
1166 | struct raid_set *rs = NULL; | |
1167 | ||
1168 | /* Must have at least <raid_type> <#raid_params> */ | |
1169 | if (argc < 2) { | |
1170 | ti->error = "Too few arguments"; | |
1171 | return -EINVAL; | |
1172 | } | |
1173 | ||
1174 | /* raid type */ | |
1175 | rt = get_raid_type(argv[0]); | |
1176 | if (!rt) { | |
1177 | ti->error = "Unrecognised raid_type"; | |
1178 | return -EINVAL; | |
1179 | } | |
1180 | argc--; | |
1181 | argv++; | |
1182 | ||
1183 | /* number of RAID parameters */ | |
1184 | if (strict_strtoul(argv[0], 10, &num_raid_params) < 0) { | |
1185 | ti->error = "Cannot understand number of RAID parameters"; | |
1186 | return -EINVAL; | |
1187 | } | |
1188 | argc--; | |
1189 | argv++; | |
1190 | ||
1191 | /* Skip over RAID params for now and find out # of devices */ | |
1192 | if (num_raid_params + 1 > argc) { | |
1193 | ti->error = "Arguments do not agree with counts given"; | |
1194 | return -EINVAL; | |
1195 | } | |
1196 | ||
1197 | if ((strict_strtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || | |
1198 | (num_raid_devs >= INT_MAX)) { | |
1199 | ti->error = "Cannot understand number of raid devices"; | |
1200 | return -EINVAL; | |
1201 | } | |
1202 | ||
1203 | rs = context_alloc(ti, rt, (unsigned)num_raid_devs); | |
1204 | if (IS_ERR(rs)) | |
1205 | return PTR_ERR(rs); | |
1206 | ||
1207 | ret = parse_raid_params(rs, argv, (unsigned)num_raid_params); | |
1208 | if (ret) | |
1209 | goto bad; | |
1210 | ||
1211 | ret = -EINVAL; | |
1212 | ||
1213 | argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */ | |
1214 | argv += num_raid_params + 1; | |
1215 | ||
1216 | if (argc != (num_raid_devs * 2)) { | |
1217 | ti->error = "Supplied RAID devices does not match the count given"; | |
1218 | goto bad; | |
1219 | } | |
1220 | ||
1221 | ret = dev_parms(rs, argv); | |
1222 | if (ret) | |
1223 | goto bad; | |
1224 | ||
b12d437b JB |
1225 | rs->md.sync_super = super_sync; |
1226 | ret = analyse_superblocks(ti, rs); | |
1227 | if (ret) | |
1228 | goto bad; | |
1229 | ||
9d09e663 | 1230 | INIT_WORK(&rs->md.event_work, do_table_event); |
9d09e663 | 1231 | ti->private = rs; |
55a62eef | 1232 | ti->num_flush_bios = 1; |
9d09e663 N |
1233 | |
1234 | mutex_lock(&rs->md.reconfig_mutex); | |
1235 | ret = md_run(&rs->md); | |
1236 | rs->md.in_sync = 0; /* Assume already marked dirty */ | |
1237 | mutex_unlock(&rs->md.reconfig_mutex); | |
1238 | ||
1239 | if (ret) { | |
1240 | ti->error = "Fail to run raid array"; | |
1241 | goto bad; | |
1242 | } | |
1243 | ||
63f33b8d JB |
1244 | if (ti->len != rs->md.array_sectors) { |
1245 | ti->error = "Array size does not match requested target length"; | |
1246 | ret = -EINVAL; | |
1247 | goto size_mismatch; | |
1248 | } | |
9d09e663 | 1249 | rs->callbacks.congested_fn = raid_is_congested; |
9d09e663 N |
1250 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
1251 | ||
32737279 | 1252 | mddev_suspend(&rs->md); |
9d09e663 N |
1253 | return 0; |
1254 | ||
63f33b8d JB |
1255 | size_mismatch: |
1256 | md_stop(&rs->md); | |
9d09e663 N |
1257 | bad: |
1258 | context_free(rs); | |
1259 | ||
1260 | return ret; | |
1261 | } | |
1262 | ||
1263 | static void raid_dtr(struct dm_target *ti) | |
1264 | { | |
1265 | struct raid_set *rs = ti->private; | |
1266 | ||
1267 | list_del_init(&rs->callbacks.list); | |
1268 | md_stop(&rs->md); | |
1269 | context_free(rs); | |
1270 | } | |
1271 | ||
7de3ee57 | 1272 | static int raid_map(struct dm_target *ti, struct bio *bio) |
9d09e663 N |
1273 | { |
1274 | struct raid_set *rs = ti->private; | |
fd01b88c | 1275 | struct mddev *mddev = &rs->md; |
9d09e663 N |
1276 | |
1277 | mddev->pers->make_request(mddev, bio); | |
1278 | ||
1279 | return DM_MAPIO_SUBMITTED; | |
1280 | } | |
1281 | ||
be83651f JB |
1282 | static const char *decipher_sync_action(struct mddev *mddev) |
1283 | { | |
1284 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
1285 | return "frozen"; | |
1286 | ||
1287 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1288 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { | |
1289 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
1290 | return "reshape"; | |
1291 | ||
1292 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
1293 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1294 | return "resync"; | |
1295 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
1296 | return "check"; | |
1297 | return "repair"; | |
1298 | } | |
1299 | ||
1300 | if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) | |
1301 | return "recover"; | |
1302 | } | |
1303 | ||
1304 | return "idle"; | |
1305 | } | |
1306 | ||
fd7c092e MP |
1307 | static void raid_status(struct dm_target *ti, status_type_t type, |
1308 | unsigned status_flags, char *result, unsigned maxlen) | |
9d09e663 N |
1309 | { |
1310 | struct raid_set *rs = ti->private; | |
1311 | unsigned raid_param_cnt = 1; /* at least 1 for chunksize */ | |
1312 | unsigned sz = 0; | |
2e727c3c | 1313 | int i, array_in_sync = 0; |
9d09e663 N |
1314 | sector_t sync; |
1315 | ||
1316 | switch (type) { | |
1317 | case STATUSTYPE_INFO: | |
1318 | DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks); | |
1319 | ||
9d09e663 N |
1320 | if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery)) |
1321 | sync = rs->md.curr_resync_completed; | |
1322 | else | |
1323 | sync = rs->md.recovery_cp; | |
1324 | ||
2e727c3c | 1325 | if (sync >= rs->md.resync_max_sectors) { |
be83651f JB |
1326 | /* |
1327 | * Sync complete. | |
1328 | */ | |
2e727c3c | 1329 | array_in_sync = 1; |
9d09e663 | 1330 | sync = rs->md.resync_max_sectors; |
be83651f JB |
1331 | } else if (test_bit(MD_RECOVERY_REQUESTED, &rs->md.recovery)) { |
1332 | /* | |
1333 | * If "check" or "repair" is occurring, the array has | |
1334 | * undergone and initial sync and the health characters | |
1335 | * should not be 'a' anymore. | |
1336 | */ | |
1337 | array_in_sync = 1; | |
2e727c3c JB |
1338 | } else { |
1339 | /* | |
1340 | * The array may be doing an initial sync, or it may | |
1341 | * be rebuilding individual components. If all the | |
1342 | * devices are In_sync, then it is the array that is | |
1343 | * being initialized. | |
1344 | */ | |
1345 | for (i = 0; i < rs->md.raid_disks; i++) | |
1346 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1347 | array_in_sync = 1; | |
1348 | } | |
be83651f | 1349 | |
2e727c3c JB |
1350 | /* |
1351 | * Status characters: | |
1352 | * 'D' = Dead/Failed device | |
1353 | * 'a' = Alive but not in-sync | |
1354 | * 'A' = Alive and in-sync | |
1355 | */ | |
1356 | for (i = 0; i < rs->md.raid_disks; i++) { | |
1357 | if (test_bit(Faulty, &rs->dev[i].rdev.flags)) | |
1358 | DMEMIT("D"); | |
1359 | else if (!array_in_sync || | |
1360 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1361 | DMEMIT("a"); | |
1362 | else | |
1363 | DMEMIT("A"); | |
1364 | } | |
9d09e663 | 1365 | |
2e727c3c JB |
1366 | /* |
1367 | * In-sync ratio: | |
1368 | * The in-sync ratio shows the progress of: | |
1369 | * - Initializing the array | |
1370 | * - Rebuilding a subset of devices of the array | |
1371 | * The user can distinguish between the two by referring | |
1372 | * to the status characters. | |
1373 | */ | |
9d09e663 N |
1374 | DMEMIT(" %llu/%llu", |
1375 | (unsigned long long) sync, | |
1376 | (unsigned long long) rs->md.resync_max_sectors); | |
1377 | ||
be83651f JB |
1378 | /* |
1379 | * Sync action: | |
1380 | * See Documentation/device-mapper/dm-raid.c for | |
1381 | * information on each of these states. | |
1382 | */ | |
1383 | DMEMIT(" %s", decipher_sync_action(&rs->md)); | |
1384 | ||
1385 | /* | |
1386 | * resync_mismatches/mismatch_cnt | |
1387 | * This field shows the number of discrepancies found when | |
1388 | * performing a "check" of the array. | |
1389 | */ | |
1390 | DMEMIT(" %llu", | |
1391 | (unsigned long long) | |
1392 | atomic64_read(&rs->md.resync_mismatches)); | |
9d09e663 N |
1393 | break; |
1394 | case STATUSTYPE_TABLE: | |
1395 | /* The string you would use to construct this array */ | |
46bed2b5 | 1396 | for (i = 0; i < rs->md.raid_disks; i++) { |
13c87583 JB |
1397 | if ((rs->print_flags & DMPF_REBUILD) && |
1398 | rs->dev[i].data_dev && | |
9d09e663 | 1399 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
13c87583 | 1400 | raid_param_cnt += 2; /* for rebuilds */ |
46bed2b5 JB |
1401 | if (rs->dev[i].data_dev && |
1402 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1403 | raid_param_cnt += 2; | |
1404 | } | |
9d09e663 | 1405 | |
34f8ac6d | 1406 | raid_param_cnt += (hweight32(rs->print_flags & ~DMPF_REBUILD) * 2); |
9d09e663 N |
1407 | if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)) |
1408 | raid_param_cnt--; | |
1409 | ||
1410 | DMEMIT("%s %u %u", rs->raid_type->name, | |
1411 | raid_param_cnt, rs->md.chunk_sectors); | |
1412 | ||
1413 | if ((rs->print_flags & DMPF_SYNC) && | |
1414 | (rs->md.recovery_cp == MaxSector)) | |
1415 | DMEMIT(" sync"); | |
1416 | if (rs->print_flags & DMPF_NOSYNC) | |
1417 | DMEMIT(" nosync"); | |
1418 | ||
1419 | for (i = 0; i < rs->md.raid_disks; i++) | |
13c87583 JB |
1420 | if ((rs->print_flags & DMPF_REBUILD) && |
1421 | rs->dev[i].data_dev && | |
9d09e663 N |
1422 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
1423 | DMEMIT(" rebuild %u", i); | |
1424 | ||
1425 | if (rs->print_flags & DMPF_DAEMON_SLEEP) | |
1426 | DMEMIT(" daemon_sleep %lu", | |
1427 | rs->md.bitmap_info.daemon_sleep); | |
1428 | ||
1429 | if (rs->print_flags & DMPF_MIN_RECOVERY_RATE) | |
1430 | DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min); | |
1431 | ||
1432 | if (rs->print_flags & DMPF_MAX_RECOVERY_RATE) | |
1433 | DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max); | |
1434 | ||
46bed2b5 JB |
1435 | for (i = 0; i < rs->md.raid_disks; i++) |
1436 | if (rs->dev[i].data_dev && | |
1437 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1438 | DMEMIT(" write_mostly %u", i); | |
1439 | ||
9d09e663 N |
1440 | if (rs->print_flags & DMPF_MAX_WRITE_BEHIND) |
1441 | DMEMIT(" max_write_behind %lu", | |
1442 | rs->md.bitmap_info.max_write_behind); | |
1443 | ||
1444 | if (rs->print_flags & DMPF_STRIPE_CACHE) { | |
d1688a6d | 1445 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1446 | |
1447 | /* convert from kiB to sectors */ | |
1448 | DMEMIT(" stripe_cache %d", | |
1449 | conf ? conf->max_nr_stripes * 2 : 0); | |
1450 | } | |
1451 | ||
c1084561 JB |
1452 | if (rs->print_flags & DMPF_REGION_SIZE) |
1453 | DMEMIT(" region_size %lu", | |
1454 | rs->md.bitmap_info.chunksize >> 9); | |
1455 | ||
63f33b8d JB |
1456 | if (rs->print_flags & DMPF_RAID10_COPIES) |
1457 | DMEMIT(" raid10_copies %u", | |
1458 | raid10_md_layout_to_copies(rs->md.layout)); | |
1459 | ||
1460 | if (rs->print_flags & DMPF_RAID10_FORMAT) | |
fe5d2f4a JB |
1461 | DMEMIT(" raid10_format %s", |
1462 | raid10_md_layout_to_format(rs->md.layout)); | |
63f33b8d | 1463 | |
9d09e663 N |
1464 | DMEMIT(" %d", rs->md.raid_disks); |
1465 | for (i = 0; i < rs->md.raid_disks; i++) { | |
b12d437b JB |
1466 | if (rs->dev[i].meta_dev) |
1467 | DMEMIT(" %s", rs->dev[i].meta_dev->name); | |
1468 | else | |
1469 | DMEMIT(" -"); | |
9d09e663 N |
1470 | |
1471 | if (rs->dev[i].data_dev) | |
1472 | DMEMIT(" %s", rs->dev[i].data_dev->name); | |
1473 | else | |
1474 | DMEMIT(" -"); | |
1475 | } | |
1476 | } | |
9d09e663 N |
1477 | } |
1478 | ||
be83651f JB |
1479 | static int raid_message(struct dm_target *ti, unsigned argc, char **argv) |
1480 | { | |
1481 | struct raid_set *rs = ti->private; | |
1482 | struct mddev *mddev = &rs->md; | |
1483 | ||
1484 | if (!strcasecmp(argv[0], "reshape")) { | |
1485 | DMERR("Reshape not supported."); | |
1486 | return -EINVAL; | |
1487 | } | |
1488 | ||
1489 | if (!mddev->pers || !mddev->pers->sync_request) | |
1490 | return -EINVAL; | |
1491 | ||
1492 | if (!strcasecmp(argv[0], "frozen")) | |
1493 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
1494 | else | |
1495 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
1496 | ||
1497 | if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) { | |
1498 | if (mddev->sync_thread) { | |
1499 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1500 | md_reap_sync_thread(mddev); | |
1501 | } | |
1502 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1503 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
1504 | return -EBUSY; | |
1505 | else if (!strcasecmp(argv[0], "resync")) | |
1506 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1507 | else if (!strcasecmp(argv[0], "recover")) { | |
1508 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
1509 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1510 | } else { | |
1511 | if (!strcasecmp(argv[0], "check")) | |
1512 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
1513 | else if (!!strcasecmp(argv[0], "repair")) | |
1514 | return -EINVAL; | |
1515 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
1516 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
1517 | } | |
1518 | if (mddev->ro == 2) { | |
1519 | /* A write to sync_action is enough to justify | |
1520 | * canceling read-auto mode | |
1521 | */ | |
1522 | mddev->ro = 0; | |
1523 | if (!mddev->suspended) | |
1524 | md_wakeup_thread(mddev->sync_thread); | |
1525 | } | |
1526 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1527 | if (!mddev->suspended) | |
1528 | md_wakeup_thread(mddev->thread); | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | static int raid_iterate_devices(struct dm_target *ti, | |
1534 | iterate_devices_callout_fn fn, void *data) | |
9d09e663 N |
1535 | { |
1536 | struct raid_set *rs = ti->private; | |
1537 | unsigned i; | |
1538 | int ret = 0; | |
1539 | ||
1540 | for (i = 0; !ret && i < rs->md.raid_disks; i++) | |
1541 | if (rs->dev[i].data_dev) | |
1542 | ret = fn(ti, | |
1543 | rs->dev[i].data_dev, | |
1544 | 0, /* No offset on data devs */ | |
1545 | rs->md.dev_sectors, | |
1546 | data); | |
1547 | ||
1548 | return ret; | |
1549 | } | |
1550 | ||
1551 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) | |
1552 | { | |
1553 | struct raid_set *rs = ti->private; | |
1554 | unsigned chunk_size = rs->md.chunk_sectors << 9; | |
d1688a6d | 1555 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1556 | |
1557 | blk_limits_io_min(limits, chunk_size); | |
1558 | blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); | |
1559 | } | |
1560 | ||
1561 | static void raid_presuspend(struct dm_target *ti) | |
1562 | { | |
1563 | struct raid_set *rs = ti->private; | |
1564 | ||
1565 | md_stop_writes(&rs->md); | |
1566 | } | |
1567 | ||
1568 | static void raid_postsuspend(struct dm_target *ti) | |
1569 | { | |
1570 | struct raid_set *rs = ti->private; | |
1571 | ||
1572 | mddev_suspend(&rs->md); | |
1573 | } | |
1574 | ||
1575 | static void raid_resume(struct dm_target *ti) | |
1576 | { | |
1577 | struct raid_set *rs = ti->private; | |
1578 | ||
81f382f9 | 1579 | set_bit(MD_CHANGE_DEVS, &rs->md.flags); |
34f8ac6d JB |
1580 | if (!rs->bitmap_loaded) { |
1581 | bitmap_load(&rs->md); | |
1582 | rs->bitmap_loaded = 1; | |
47525e59 | 1583 | } |
34f8ac6d | 1584 | |
47525e59 | 1585 | clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); |
9d09e663 N |
1586 | mddev_resume(&rs->md); |
1587 | } | |
1588 | ||
1589 | static struct target_type raid_target = { | |
1590 | .name = "raid", | |
be83651f | 1591 | .version = {1, 5, 0}, |
9d09e663 N |
1592 | .module = THIS_MODULE, |
1593 | .ctr = raid_ctr, | |
1594 | .dtr = raid_dtr, | |
1595 | .map = raid_map, | |
1596 | .status = raid_status, | |
be83651f | 1597 | .message = raid_message, |
9d09e663 N |
1598 | .iterate_devices = raid_iterate_devices, |
1599 | .io_hints = raid_io_hints, | |
1600 | .presuspend = raid_presuspend, | |
1601 | .postsuspend = raid_postsuspend, | |
1602 | .resume = raid_resume, | |
1603 | }; | |
1604 | ||
1605 | static int __init dm_raid_init(void) | |
1606 | { | |
fe5d2f4a JB |
1607 | DMINFO("Loading target version %u.%u.%u", |
1608 | raid_target.version[0], | |
1609 | raid_target.version[1], | |
1610 | raid_target.version[2]); | |
9d09e663 N |
1611 | return dm_register_target(&raid_target); |
1612 | } | |
1613 | ||
1614 | static void __exit dm_raid_exit(void) | |
1615 | { | |
1616 | dm_unregister_target(&raid_target); | |
1617 | } | |
1618 | ||
1619 | module_init(dm_raid_init); | |
1620 | module_exit(dm_raid_exit); | |
1621 | ||
1622 | MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); | |
63f33b8d JB |
1623 | MODULE_ALIAS("dm-raid1"); |
1624 | MODULE_ALIAS("dm-raid10"); | |
9d09e663 N |
1625 | MODULE_ALIAS("dm-raid4"); |
1626 | MODULE_ALIAS("dm-raid5"); | |
1627 | MODULE_ALIAS("dm-raid6"); | |
1628 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); | |
1629 | MODULE_LICENSE("GPL"); |