Commit | Line | Data |
---|---|---|
9d09e663 N |
1 | /* |
2 | * Copyright (C) 2010-2011 Neil Brown | |
0cf45031 | 3 | * Copyright (C) 2010-2015 Red Hat, Inc. All rights reserved. |
9d09e663 N |
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 | 19 | #define DM_MSG_PREFIX "raid" |
c76d53f4 | 20 | #define MAX_RAID_DEVICES 253 /* raid4/5/6 limit */ |
9d09e663 | 21 | |
48cf06bc HM |
22 | static bool devices_handle_discard_safely = false; |
23 | ||
9d09e663 | 24 | /* |
b12d437b JB |
25 | * The following flags are used by dm-raid.c to set up the array state. |
26 | * They must be cleared before md_run is called. | |
9d09e663 | 27 | */ |
b12d437b | 28 | #define FirstUse 10 /* rdev flag */ |
9d09e663 N |
29 | |
30 | struct raid_dev { | |
31 | /* | |
32 | * Two DM devices, one to hold metadata and one to hold the | |
33 | * actual data/parity. The reason for this is to not confuse | |
34 | * ti->len and give more flexibility in altering size and | |
35 | * characteristics. | |
36 | * | |
37 | * While it is possible for this device to be associated | |
38 | * with a different physical device than the data_dev, it | |
39 | * is intended for it to be the same. | |
40 | * |--------- Physical Device ---------| | |
41 | * |- meta_dev -|------ data_dev ------| | |
42 | */ | |
43 | struct dm_dev *meta_dev; | |
44 | struct dm_dev *data_dev; | |
3cb03002 | 45 | struct md_rdev rdev; |
9d09e663 N |
46 | }; |
47 | ||
48 | /* | |
c76d53f4 | 49 | * Flags for rs->ctr_flags field. |
9d09e663 | 50 | */ |
c76d53f4 HM |
51 | #define CTR_FLAG_SYNC 0x1 |
52 | #define CTR_FLAG_NOSYNC 0x2 | |
53 | #define CTR_FLAG_REBUILD 0x4 | |
54 | #define CTR_FLAG_DAEMON_SLEEP 0x8 | |
55 | #define CTR_FLAG_MIN_RECOVERY_RATE 0x10 | |
56 | #define CTR_FLAG_MAX_RECOVERY_RATE 0x20 | |
57 | #define CTR_FLAG_MAX_WRITE_BEHIND 0x40 | |
58 | #define CTR_FLAG_STRIPE_CACHE 0x80 | |
59 | #define CTR_FLAG_REGION_SIZE 0x100 | |
60 | #define CTR_FLAG_RAID10_COPIES 0x200 | |
61 | #define CTR_FLAG_RAID10_FORMAT 0x400 | |
63f33b8d | 62 | |
9d09e663 N |
63 | struct raid_set { |
64 | struct dm_target *ti; | |
65 | ||
34f8ac6d | 66 | uint32_t bitmap_loaded; |
c76d53f4 | 67 | uint32_t ctr_flags; |
9d09e663 | 68 | |
fd01b88c | 69 | struct mddev md; |
9d09e663 N |
70 | struct raid_type *raid_type; |
71 | struct dm_target_callbacks callbacks; | |
72 | ||
73 | struct raid_dev dev[0]; | |
74 | }; | |
75 | ||
76 | /* Supported raid types and properties. */ | |
77 | static struct raid_type { | |
78 | const char *name; /* RAID algorithm. */ | |
79 | const char *descr; /* Descriptor text for logging. */ | |
80 | const unsigned parity_devs; /* # of parity devices. */ | |
81 | const unsigned minimal_devs; /* minimal # of devices in set. */ | |
82 | const unsigned level; /* RAID level. */ | |
83 | const unsigned algorithm; /* RAID algorithm. */ | |
84 | } raid_types[] = { | |
0cf45031 | 85 | {"raid0", "RAID0 (striping)", 0, 2, 0, 0 /* NONE */}, |
32737279 | 86 | {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */}, |
63f33b8d | 87 | {"raid10", "RAID10 (striped mirrors)", 0, 2, 10, UINT_MAX /* Varies */}, |
9d09e663 N |
88 | {"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, |
89 | {"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC}, | |
90 | {"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC}, | |
91 | {"raid5_ls", "RAID5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, | |
92 | {"raid5_rs", "RAID5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, | |
93 | {"raid6_zr", "RAID6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART}, | |
94 | {"raid6_nr", "RAID6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART}, | |
95 | {"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE} | |
96 | }; | |
97 | ||
fe5d2f4a JB |
98 | static char *raid10_md_layout_to_format(int layout) |
99 | { | |
100 | /* | |
101 | * Bit 16 and 17 stand for "offset" and "use_far_sets" | |
102 | * Refer to MD's raid10.c for details | |
103 | */ | |
104 | if ((layout & 0x10000) && (layout & 0x20000)) | |
105 | return "offset"; | |
106 | ||
107 | if ((layout & 0xFF) > 1) | |
108 | return "near"; | |
109 | ||
110 | return "far"; | |
111 | } | |
112 | ||
63f33b8d JB |
113 | static unsigned raid10_md_layout_to_copies(int layout) |
114 | { | |
fe5d2f4a JB |
115 | if ((layout & 0xFF) > 1) |
116 | return layout & 0xFF; | |
117 | return (layout >> 8) & 0xFF; | |
63f33b8d JB |
118 | } |
119 | ||
120 | static int raid10_format_to_md_layout(char *format, unsigned copies) | |
121 | { | |
fe5d2f4a JB |
122 | unsigned n = 1, f = 1; |
123 | ||
c76d53f4 | 124 | if (!strcasecmp("near", format)) |
fe5d2f4a JB |
125 | n = copies; |
126 | else | |
127 | f = copies; | |
128 | ||
c76d53f4 | 129 | if (!strcasecmp("offset", format)) |
fe5d2f4a JB |
130 | return 0x30000 | (f << 8) | n; |
131 | ||
c76d53f4 | 132 | if (!strcasecmp("far", format)) |
fe5d2f4a JB |
133 | return 0x20000 | (f << 8) | n; |
134 | ||
135 | return (f << 8) | n; | |
63f33b8d JB |
136 | } |
137 | ||
9d09e663 N |
138 | static struct raid_type *get_raid_type(char *name) |
139 | { | |
140 | int i; | |
141 | ||
142 | for (i = 0; i < ARRAY_SIZE(raid_types); i++) | |
143 | if (!strcmp(raid_types[i].name, name)) | |
144 | return &raid_types[i]; | |
145 | ||
146 | return NULL; | |
147 | } | |
148 | ||
149 | static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs) | |
150 | { | |
151 | unsigned i; | |
152 | struct raid_set *rs; | |
9d09e663 N |
153 | |
154 | if (raid_devs <= raid_type->parity_devs) { | |
155 | ti->error = "Insufficient number of devices"; | |
156 | return ERR_PTR(-EINVAL); | |
157 | } | |
158 | ||
9d09e663 N |
159 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); |
160 | if (!rs) { | |
161 | ti->error = "Cannot allocate raid context"; | |
162 | return ERR_PTR(-ENOMEM); | |
163 | } | |
164 | ||
165 | mddev_init(&rs->md); | |
166 | ||
167 | rs->ti = ti; | |
168 | rs->raid_type = raid_type; | |
169 | rs->md.raid_disks = raid_devs; | |
170 | rs->md.level = raid_type->level; | |
171 | rs->md.new_level = rs->md.level; | |
9d09e663 N |
172 | rs->md.layout = raid_type->algorithm; |
173 | rs->md.new_layout = rs->md.layout; | |
174 | rs->md.delta_disks = 0; | |
175 | rs->md.recovery_cp = 0; | |
176 | ||
177 | for (i = 0; i < raid_devs; i++) | |
178 | md_rdev_init(&rs->dev[i].rdev); | |
179 | ||
180 | /* | |
181 | * Remaining items to be initialized by further RAID params: | |
182 | * rs->md.persistent | |
183 | * rs->md.external | |
184 | * rs->md.chunk_sectors | |
185 | * rs->md.new_chunk_sectors | |
c039c332 | 186 | * rs->md.dev_sectors |
9d09e663 N |
187 | */ |
188 | ||
189 | return rs; | |
190 | } | |
191 | ||
192 | static void context_free(struct raid_set *rs) | |
193 | { | |
194 | int i; | |
195 | ||
b12d437b JB |
196 | for (i = 0; i < rs->md.raid_disks; i++) { |
197 | if (rs->dev[i].meta_dev) | |
198 | dm_put_device(rs->ti, rs->dev[i].meta_dev); | |
545c8795 | 199 | md_rdev_clear(&rs->dev[i].rdev); |
9d09e663 N |
200 | if (rs->dev[i].data_dev) |
201 | dm_put_device(rs->ti, rs->dev[i].data_dev); | |
b12d437b | 202 | } |
9d09e663 N |
203 | |
204 | kfree(rs); | |
205 | } | |
206 | ||
207 | /* | |
208 | * For every device we have two words | |
209 | * <meta_dev>: meta device name or '-' if missing | |
210 | * <data_dev>: data device name or '-' if missing | |
211 | * | |
b12d437b JB |
212 | * The following are permitted: |
213 | * - - | |
214 | * - <data_dev> | |
215 | * <meta_dev> <data_dev> | |
216 | * | |
217 | * The following is not allowed: | |
218 | * <meta_dev> - | |
219 | * | |
220 | * This code parses those words. If there is a failure, | |
221 | * the caller must use context_free to unwind the operations. | |
9d09e663 N |
222 | */ |
223 | static int dev_parms(struct raid_set *rs, char **argv) | |
224 | { | |
225 | int i; | |
226 | int rebuild = 0; | |
227 | int metadata_available = 0; | |
228 | int ret = 0; | |
229 | ||
230 | for (i = 0; i < rs->md.raid_disks; i++, argv += 2) { | |
231 | rs->dev[i].rdev.raid_disk = i; | |
232 | ||
233 | rs->dev[i].meta_dev = NULL; | |
234 | rs->dev[i].data_dev = NULL; | |
235 | ||
236 | /* | |
237 | * There are no offsets, since there is a separate device | |
238 | * for data and metadata. | |
239 | */ | |
240 | rs->dev[i].rdev.data_offset = 0; | |
241 | rs->dev[i].rdev.mddev = &rs->md; | |
242 | ||
243 | if (strcmp(argv[0], "-")) { | |
b12d437b JB |
244 | ret = dm_get_device(rs->ti, argv[0], |
245 | dm_table_get_mode(rs->ti->table), | |
246 | &rs->dev[i].meta_dev); | |
247 | rs->ti->error = "RAID metadata device lookup failure"; | |
248 | if (ret) | |
249 | return ret; | |
250 | ||
251 | rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); | |
252 | if (!rs->dev[i].rdev.sb_page) | |
253 | return -ENOMEM; | |
9d09e663 N |
254 | } |
255 | ||
256 | if (!strcmp(argv[1], "-")) { | |
257 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && | |
258 | (!rs->dev[i].rdev.recovery_offset)) { | |
259 | rs->ti->error = "Drive designated for rebuild not specified"; | |
260 | return -EINVAL; | |
261 | } | |
262 | ||
b12d437b JB |
263 | rs->ti->error = "No data device supplied with metadata device"; |
264 | if (rs->dev[i].meta_dev) | |
265 | return -EINVAL; | |
266 | ||
9d09e663 N |
267 | continue; |
268 | } | |
269 | ||
270 | ret = dm_get_device(rs->ti, argv[1], | |
271 | dm_table_get_mode(rs->ti->table), | |
272 | &rs->dev[i].data_dev); | |
273 | if (ret) { | |
274 | rs->ti->error = "RAID device lookup failure"; | |
275 | return ret; | |
276 | } | |
277 | ||
b12d437b JB |
278 | if (rs->dev[i].meta_dev) { |
279 | metadata_available = 1; | |
280 | rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; | |
281 | } | |
9d09e663 N |
282 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
283 | list_add(&rs->dev[i].rdev.same_set, &rs->md.disks); | |
284 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
285 | rebuild++; | |
286 | } | |
287 | ||
288 | if (metadata_available) { | |
289 | rs->md.external = 0; | |
290 | rs->md.persistent = 1; | |
291 | rs->md.major_version = 2; | |
292 | } else if (rebuild && !rs->md.recovery_cp) { | |
293 | /* | |
294 | * Without metadata, we will not be able to tell if the array | |
295 | * is in-sync or not - we must assume it is not. Therefore, | |
296 | * it is impossible to rebuild a drive. | |
297 | * | |
298 | * Even if there is metadata, the on-disk information may | |
299 | * indicate that the array is not in-sync and it will then | |
300 | * fail at that time. | |
301 | * | |
302 | * User could specify 'nosync' option if desperate. | |
303 | */ | |
304 | DMERR("Unable to rebuild drive while array is not in-sync"); | |
305 | rs->ti->error = "RAID device lookup failure"; | |
306 | return -EINVAL; | |
307 | } | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
c1084561 JB |
312 | /* |
313 | * validate_region_size | |
314 | * @rs | |
315 | * @region_size: region size in sectors. If 0, pick a size (4MiB default). | |
316 | * | |
317 | * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). | |
318 | * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. | |
319 | * | |
320 | * Returns: 0 on success, -EINVAL on failure. | |
321 | */ | |
322 | static int validate_region_size(struct raid_set *rs, unsigned long region_size) | |
323 | { | |
324 | unsigned long min_region_size = rs->ti->len / (1 << 21); | |
325 | ||
326 | if (!region_size) { | |
327 | /* | |
328 | * Choose a reasonable default. All figures in sectors. | |
329 | */ | |
330 | if (min_region_size > (1 << 13)) { | |
3a0f9aae | 331 | /* If not a power of 2, make it the next power of 2 */ |
042745ee | 332 | region_size = roundup_pow_of_two(min_region_size); |
c1084561 JB |
333 | DMINFO("Choosing default region size of %lu sectors", |
334 | region_size); | |
c1084561 JB |
335 | } else { |
336 | DMINFO("Choosing default region size of 4MiB"); | |
337 | region_size = 1 << 13; /* sectors */ | |
338 | } | |
339 | } else { | |
340 | /* | |
341 | * Validate user-supplied value. | |
342 | */ | |
343 | if (region_size > rs->ti->len) { | |
344 | rs->ti->error = "Supplied region size is too large"; | |
345 | return -EINVAL; | |
346 | } | |
347 | ||
348 | if (region_size < min_region_size) { | |
349 | DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", | |
350 | region_size, min_region_size); | |
351 | rs->ti->error = "Supplied region size is too small"; | |
352 | return -EINVAL; | |
353 | } | |
354 | ||
355 | if (!is_power_of_2(region_size)) { | |
356 | rs->ti->error = "Region size is not a power of 2"; | |
357 | return -EINVAL; | |
358 | } | |
359 | ||
360 | if (region_size < rs->md.chunk_sectors) { | |
361 | rs->ti->error = "Region size is smaller than the chunk size"; | |
362 | return -EINVAL; | |
363 | } | |
364 | } | |
365 | ||
366 | /* | |
367 | * Convert sectors to bytes. | |
368 | */ | |
369 | rs->md.bitmap_info.chunksize = (region_size << 9); | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
eb649123 | 374 | /* |
55ebbb59 | 375 | * validate_raid_redundancy |
eb649123 JB |
376 | * @rs |
377 | * | |
55ebbb59 JB |
378 | * Determine if there are enough devices in the array that haven't |
379 | * failed (or are being rebuilt) to form a usable array. | |
eb649123 JB |
380 | * |
381 | * Returns: 0 on success, -EINVAL on failure. | |
382 | */ | |
55ebbb59 | 383 | static int validate_raid_redundancy(struct raid_set *rs) |
eb649123 JB |
384 | { |
385 | unsigned i, rebuild_cnt = 0; | |
3f6bbd3f | 386 | unsigned rebuilds_per_group = 0, copies, d; |
fe5d2f4a | 387 | unsigned group_size, last_group_start; |
eb649123 | 388 | |
eb649123 | 389 | for (i = 0; i < rs->md.raid_disks; i++) |
55ebbb59 JB |
390 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || |
391 | !rs->dev[i].rdev.sb_page) | |
eb649123 JB |
392 | rebuild_cnt++; |
393 | ||
394 | switch (rs->raid_type->level) { | |
395 | case 1: | |
396 | if (rebuild_cnt >= rs->md.raid_disks) | |
397 | goto too_many; | |
398 | break; | |
399 | case 4: | |
400 | case 5: | |
401 | case 6: | |
402 | if (rebuild_cnt > rs->raid_type->parity_devs) | |
403 | goto too_many; | |
404 | break; | |
405 | case 10: | |
4ec1e369 JB |
406 | copies = raid10_md_layout_to_copies(rs->md.layout); |
407 | if (rebuild_cnt < copies) | |
408 | break; | |
409 | ||
410 | /* | |
411 | * It is possible to have a higher rebuild count for RAID10, | |
412 | * as long as the failed devices occur in different mirror | |
413 | * groups (i.e. different stripes). | |
414 | * | |
4ec1e369 JB |
415 | * When checking "near" format, make sure no adjacent devices |
416 | * have failed beyond what can be handled. In addition to the | |
417 | * simple case where the number of devices is a multiple of the | |
418 | * number of copies, we must also handle cases where the number | |
419 | * of devices is not a multiple of the number of copies. | |
420 | * E.g. dev1 dev2 dev3 dev4 dev5 | |
421 | * A A B B C | |
422 | * C D D E E | |
423 | */ | |
fe5d2f4a JB |
424 | if (!strcmp("near", raid10_md_layout_to_format(rs->md.layout))) { |
425 | for (i = 0; i < rs->md.raid_disks * copies; i++) { | |
426 | if (!(i % copies)) | |
427 | rebuilds_per_group = 0; | |
428 | d = i % rs->md.raid_disks; | |
429 | if ((!rs->dev[d].rdev.sb_page || | |
430 | !test_bit(In_sync, &rs->dev[d].rdev.flags)) && | |
431 | (++rebuilds_per_group >= copies)) | |
432 | goto too_many; | |
433 | } | |
434 | break; | |
435 | } | |
436 | ||
437 | /* | |
438 | * When checking "far" and "offset" formats, we need to ensure | |
439 | * that the device that holds its copy is not also dead or | |
440 | * being rebuilt. (Note that "far" and "offset" formats only | |
441 | * support two copies right now. These formats also only ever | |
442 | * use the 'use_far_sets' variant.) | |
443 | * | |
444 | * This check is somewhat complicated by the need to account | |
445 | * for arrays that are not a multiple of (far) copies. This | |
446 | * results in the need to treat the last (potentially larger) | |
447 | * set differently. | |
448 | */ | |
449 | group_size = (rs->md.raid_disks / copies); | |
450 | last_group_start = (rs->md.raid_disks / group_size) - 1; | |
451 | last_group_start *= group_size; | |
452 | for (i = 0; i < rs->md.raid_disks; i++) { | |
453 | if (!(i % copies) && !(i > last_group_start)) | |
55ebbb59 | 454 | rebuilds_per_group = 0; |
fe5d2f4a JB |
455 | if ((!rs->dev[i].rdev.sb_page || |
456 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) && | |
4ec1e369 | 457 | (++rebuilds_per_group >= copies)) |
fe5d2f4a | 458 | goto too_many; |
4ec1e369 JB |
459 | } |
460 | break; | |
eb649123 | 461 | default: |
55ebbb59 JB |
462 | if (rebuild_cnt) |
463 | return -EINVAL; | |
eb649123 JB |
464 | } |
465 | ||
466 | return 0; | |
467 | ||
468 | too_many: | |
eb649123 JB |
469 | return -EINVAL; |
470 | } | |
471 | ||
9d09e663 N |
472 | /* |
473 | * Possible arguments are... | |
9d09e663 N |
474 | * <chunk_size> [optional_args] |
475 | * | |
32737279 JB |
476 | * Argument definitions |
477 | * <chunk_size> The number of sectors per disk that | |
478 | * will form the "stripe" | |
479 | * [[no]sync] Force or prevent recovery of the | |
480 | * entire array | |
9d09e663 | 481 | * [rebuild <idx>] Rebuild the drive indicated by the index |
32737279 JB |
482 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
483 | * clear bits | |
9d09e663 N |
484 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
485 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization | |
46bed2b5 | 486 | * [write_mostly <idx>] Indicate a write mostly drive via index |
9d09e663 N |
487 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
488 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs | |
c1084561 | 489 | * [region_size <sectors>] Defines granularity of bitmap |
63f33b8d JB |
490 | * |
491 | * RAID10-only options: | |
492 | * [raid10_copies <# copies>] Number of copies. (Default: 2) | |
fe5d2f4a | 493 | * [raid10_format <near|far|offset>] Layout algorithm. (Default: near) |
9d09e663 N |
494 | */ |
495 | static int parse_raid_params(struct raid_set *rs, char **argv, | |
496 | unsigned num_raid_params) | |
497 | { | |
63f33b8d JB |
498 | char *raid10_format = "near"; |
499 | unsigned raid10_copies = 2; | |
eb649123 | 500 | unsigned i; |
c1084561 | 501 | unsigned long value, region_size = 0; |
c039c332 | 502 | sector_t sectors_per_dev = rs->ti->len; |
542f9038 | 503 | sector_t max_io_len; |
9d09e663 N |
504 | char *key; |
505 | ||
506 | /* | |
507 | * First, parse the in-order required arguments | |
32737279 | 508 | * "chunk_size" is the only argument of this type. |
9d09e663 | 509 | */ |
b29bebd6 | 510 | if ((kstrtoul(argv[0], 10, &value) < 0)) { |
9d09e663 N |
511 | rs->ti->error = "Bad chunk size"; |
512 | return -EINVAL; | |
32737279 JB |
513 | } else if (rs->raid_type->level == 1) { |
514 | if (value) | |
515 | DMERR("Ignoring chunk size parameter for RAID 1"); | |
516 | value = 0; | |
517 | } else if (!is_power_of_2(value)) { | |
518 | rs->ti->error = "Chunk size must be a power of 2"; | |
519 | return -EINVAL; | |
520 | } else if (value < 8) { | |
521 | rs->ti->error = "Chunk size value is too small"; | |
522 | return -EINVAL; | |
9d09e663 N |
523 | } |
524 | ||
525 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; | |
526 | argv++; | |
527 | num_raid_params--; | |
528 | ||
529 | /* | |
b12d437b JB |
530 | * We set each individual device as In_sync with a completed |
531 | * 'recovery_offset'. If there has been a device failure or | |
532 | * replacement then one of the following cases applies: | |
533 | * | |
534 | * 1) User specifies 'rebuild'. | |
535 | * - Device is reset when param is read. | |
536 | * 2) A new device is supplied. | |
537 | * - No matching superblock found, resets device. | |
538 | * 3) Device failure was transient and returns on reload. | |
539 | * - Failure noticed, resets device for bitmap replay. | |
540 | * 4) Device hadn't completed recovery after previous failure. | |
541 | * - Superblock is read and overrides recovery_offset. | |
542 | * | |
543 | * What is found in the superblocks of the devices is always | |
544 | * authoritative, unless 'rebuild' or '[no]sync' was specified. | |
9d09e663 | 545 | */ |
b12d437b | 546 | for (i = 0; i < rs->md.raid_disks; i++) { |
9d09e663 | 547 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
b12d437b JB |
548 | rs->dev[i].rdev.recovery_offset = MaxSector; |
549 | } | |
9d09e663 | 550 | |
b12d437b JB |
551 | /* |
552 | * Second, parse the unordered optional arguments | |
553 | */ | |
9d09e663 | 554 | for (i = 0; i < num_raid_params; i++) { |
13c87583 | 555 | if (!strcasecmp(argv[i], "nosync")) { |
9d09e663 | 556 | rs->md.recovery_cp = MaxSector; |
c76d53f4 | 557 | rs->ctr_flags |= CTR_FLAG_NOSYNC; |
9d09e663 N |
558 | continue; |
559 | } | |
13c87583 | 560 | if (!strcasecmp(argv[i], "sync")) { |
9d09e663 | 561 | rs->md.recovery_cp = 0; |
c76d53f4 | 562 | rs->ctr_flags |= CTR_FLAG_SYNC; |
9d09e663 N |
563 | continue; |
564 | } | |
565 | ||
566 | /* The rest of the optional arguments come in key/value pairs */ | |
567 | if ((i + 1) >= num_raid_params) { | |
568 | rs->ti->error = "Wrong number of raid parameters given"; | |
569 | return -EINVAL; | |
570 | } | |
571 | ||
572 | key = argv[i++]; | |
63f33b8d JB |
573 | |
574 | /* Parameters that take a string value are checked here. */ | |
575 | if (!strcasecmp(key, "raid10_format")) { | |
576 | if (rs->raid_type->level != 10) { | |
577 | rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type"; | |
578 | return -EINVAL; | |
579 | } | |
fe5d2f4a JB |
580 | if (strcmp("near", argv[i]) && |
581 | strcmp("far", argv[i]) && | |
582 | strcmp("offset", argv[i])) { | |
63f33b8d JB |
583 | rs->ti->error = "Invalid 'raid10_format' value given"; |
584 | return -EINVAL; | |
585 | } | |
586 | raid10_format = argv[i]; | |
c76d53f4 | 587 | rs->ctr_flags |= CTR_FLAG_RAID10_FORMAT; |
63f33b8d JB |
588 | continue; |
589 | } | |
590 | ||
b29bebd6 | 591 | if (kstrtoul(argv[i], 10, &value) < 0) { |
9d09e663 N |
592 | rs->ti->error = "Bad numerical argument given in raid params"; |
593 | return -EINVAL; | |
594 | } | |
595 | ||
63f33b8d | 596 | /* Parameters that take a numeric value are checked here */ |
13c87583 | 597 | if (!strcasecmp(key, "rebuild")) { |
7386199c | 598 | if (value >= rs->md.raid_disks) { |
9d09e663 N |
599 | rs->ti->error = "Invalid rebuild index given"; |
600 | return -EINVAL; | |
601 | } | |
602 | clear_bit(In_sync, &rs->dev[value].rdev.flags); | |
603 | rs->dev[value].rdev.recovery_offset = 0; | |
c76d53f4 | 604 | rs->ctr_flags |= CTR_FLAG_REBUILD; |
46bed2b5 JB |
605 | } else if (!strcasecmp(key, "write_mostly")) { |
606 | if (rs->raid_type->level != 1) { | |
607 | rs->ti->error = "write_mostly option is only valid for RAID1"; | |
608 | return -EINVAL; | |
609 | } | |
82324809 | 610 | if (value >= rs->md.raid_disks) { |
46bed2b5 JB |
611 | rs->ti->error = "Invalid write_mostly drive index given"; |
612 | return -EINVAL; | |
613 | } | |
614 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); | |
13c87583 | 615 | } else if (!strcasecmp(key, "max_write_behind")) { |
46bed2b5 JB |
616 | if (rs->raid_type->level != 1) { |
617 | rs->ti->error = "max_write_behind option is only valid for RAID1"; | |
618 | return -EINVAL; | |
619 | } | |
c76d53f4 | 620 | rs->ctr_flags |= CTR_FLAG_MAX_WRITE_BEHIND; |
9d09e663 N |
621 | |
622 | /* | |
623 | * In device-mapper, we specify things in sectors, but | |
624 | * MD records this value in kB | |
625 | */ | |
626 | value /= 2; | |
627 | if (value > COUNTER_MAX) { | |
628 | rs->ti->error = "Max write-behind limit out of range"; | |
629 | return -EINVAL; | |
630 | } | |
631 | rs->md.bitmap_info.max_write_behind = value; | |
13c87583 | 632 | } else if (!strcasecmp(key, "daemon_sleep")) { |
c76d53f4 | 633 | rs->ctr_flags |= CTR_FLAG_DAEMON_SLEEP; |
9d09e663 N |
634 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) { |
635 | rs->ti->error = "daemon sleep period out of range"; | |
636 | return -EINVAL; | |
637 | } | |
638 | rs->md.bitmap_info.daemon_sleep = value; | |
13c87583 | 639 | } else if (!strcasecmp(key, "stripe_cache")) { |
c76d53f4 | 640 | rs->ctr_flags |= CTR_FLAG_STRIPE_CACHE; |
9d09e663 N |
641 | |
642 | /* | |
643 | * In device-mapper, we specify things in sectors, but | |
644 | * MD records this value in kB | |
645 | */ | |
646 | value /= 2; | |
647 | ||
63f33b8d JB |
648 | if ((rs->raid_type->level != 5) && |
649 | (rs->raid_type->level != 6)) { | |
9d09e663 N |
650 | rs->ti->error = "Inappropriate argument: stripe_cache"; |
651 | return -EINVAL; | |
652 | } | |
653 | if (raid5_set_cache_size(&rs->md, (int)value)) { | |
654 | rs->ti->error = "Bad stripe_cache size"; | |
655 | return -EINVAL; | |
656 | } | |
13c87583 | 657 | } else if (!strcasecmp(key, "min_recovery_rate")) { |
c76d53f4 | 658 | rs->ctr_flags |= CTR_FLAG_MIN_RECOVERY_RATE; |
9d09e663 N |
659 | if (value > INT_MAX) { |
660 | rs->ti->error = "min_recovery_rate out of range"; | |
661 | return -EINVAL; | |
662 | } | |
663 | rs->md.sync_speed_min = (int)value; | |
13c87583 | 664 | } else if (!strcasecmp(key, "max_recovery_rate")) { |
c76d53f4 | 665 | rs->ctr_flags |= CTR_FLAG_MAX_RECOVERY_RATE; |
9d09e663 N |
666 | if (value > INT_MAX) { |
667 | rs->ti->error = "max_recovery_rate out of range"; | |
668 | return -EINVAL; | |
669 | } | |
670 | rs->md.sync_speed_max = (int)value; | |
c1084561 | 671 | } else if (!strcasecmp(key, "region_size")) { |
c76d53f4 | 672 | rs->ctr_flags |= CTR_FLAG_REGION_SIZE; |
c1084561 | 673 | region_size = value; |
63f33b8d JB |
674 | } else if (!strcasecmp(key, "raid10_copies") && |
675 | (rs->raid_type->level == 10)) { | |
676 | if ((value < 2) || (value > 0xFF)) { | |
677 | rs->ti->error = "Bad value for 'raid10_copies'"; | |
678 | return -EINVAL; | |
679 | } | |
c76d53f4 | 680 | rs->ctr_flags |= CTR_FLAG_RAID10_COPIES; |
63f33b8d | 681 | raid10_copies = value; |
9d09e663 N |
682 | } else { |
683 | DMERR("Unable to parse RAID parameter: %s", key); | |
684 | rs->ti->error = "Unable to parse RAID parameters"; | |
685 | return -EINVAL; | |
686 | } | |
687 | } | |
688 | ||
c1084561 JB |
689 | if (validate_region_size(rs, region_size)) |
690 | return -EINVAL; | |
691 | ||
692 | if (rs->md.chunk_sectors) | |
542f9038 | 693 | max_io_len = rs->md.chunk_sectors; |
c1084561 | 694 | else |
542f9038 | 695 | max_io_len = region_size; |
c1084561 | 696 | |
542f9038 MS |
697 | if (dm_set_target_max_io_len(rs->ti, max_io_len)) |
698 | return -EINVAL; | |
32737279 | 699 | |
63f33b8d JB |
700 | if (rs->raid_type->level == 10) { |
701 | if (raid10_copies > rs->md.raid_disks) { | |
702 | rs->ti->error = "Not enough devices to satisfy specification"; | |
703 | return -EINVAL; | |
704 | } | |
705 | ||
fe5d2f4a JB |
706 | /* |
707 | * If the format is not "near", we only support | |
708 | * two copies at the moment. | |
709 | */ | |
710 | if (strcmp("near", raid10_format) && (raid10_copies > 2)) { | |
711 | rs->ti->error = "Too many copies for given RAID10 format."; | |
712 | return -EINVAL; | |
713 | } | |
714 | ||
63f33b8d JB |
715 | /* (Len * #mirrors) / #devices */ |
716 | sectors_per_dev = rs->ti->len * raid10_copies; | |
717 | sector_div(sectors_per_dev, rs->md.raid_disks); | |
718 | ||
719 | rs->md.layout = raid10_format_to_md_layout(raid10_format, | |
720 | raid10_copies); | |
721 | rs->md.new_layout = rs->md.layout; | |
0cf45031 | 722 | } else if ((!rs->raid_type->level || rs->raid_type->level > 1) && |
63f33b8d JB |
723 | sector_div(sectors_per_dev, |
724 | (rs->md.raid_disks - rs->raid_type->parity_devs))) { | |
c039c332 JB |
725 | rs->ti->error = "Target length not divisible by number of data devices"; |
726 | return -EINVAL; | |
727 | } | |
728 | rs->md.dev_sectors = sectors_per_dev; | |
729 | ||
9d09e663 N |
730 | /* Assume there are no metadata devices until the drives are parsed */ |
731 | rs->md.persistent = 0; | |
732 | rs->md.external = 1; | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
737 | static void do_table_event(struct work_struct *ws) | |
738 | { | |
739 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); | |
740 | ||
741 | dm_table_event(rs->ti->table); | |
742 | } | |
743 | ||
744 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) | |
745 | { | |
746 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); | |
747 | ||
5c675f83 | 748 | return mddev_congested(&rs->md, bits); |
9d09e663 N |
749 | } |
750 | ||
b12d437b JB |
751 | /* |
752 | * This structure is never routinely used by userspace, unlike md superblocks. | |
753 | * Devices with this superblock should only ever be accessed via device-mapper. | |
754 | */ | |
755 | #define DM_RAID_MAGIC 0x64526D44 | |
756 | struct dm_raid_superblock { | |
757 | __le32 magic; /* "DmRd" */ | |
758 | __le32 features; /* Used to indicate possible future changes */ | |
759 | ||
760 | __le32 num_devices; /* Number of devices in this array. (Max 64) */ | |
761 | __le32 array_position; /* The position of this drive in the array */ | |
762 | ||
763 | __le64 events; /* Incremented by md when superblock updated */ | |
764 | __le64 failed_devices; /* Bit field of devices to indicate failures */ | |
765 | ||
766 | /* | |
767 | * This offset tracks the progress of the repair or replacement of | |
768 | * an individual drive. | |
769 | */ | |
770 | __le64 disk_recovery_offset; | |
771 | ||
772 | /* | |
773 | * This offset tracks the progress of the initial array | |
774 | * synchronisation/parity calculation. | |
775 | */ | |
776 | __le64 array_resync_offset; | |
777 | ||
778 | /* | |
779 | * RAID characteristics | |
780 | */ | |
781 | __le32 level; | |
782 | __le32 layout; | |
783 | __le32 stripe_sectors; | |
784 | ||
40d43c4b | 785 | /* Remainder of a logical block is zero-filled when writing (see super_sync()). */ |
b12d437b JB |
786 | } __packed; |
787 | ||
3cb03002 | 788 | static int read_disk_sb(struct md_rdev *rdev, int size) |
b12d437b JB |
789 | { |
790 | BUG_ON(!rdev->sb_page); | |
791 | ||
792 | if (rdev->sb_loaded) | |
793 | return 0; | |
794 | ||
795 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) { | |
0447568f JB |
796 | DMERR("Failed to read superblock of device at position %d", |
797 | rdev->raid_disk); | |
c32fb9e7 | 798 | md_error(rdev->mddev, rdev); |
b12d437b JB |
799 | return -EINVAL; |
800 | } | |
801 | ||
802 | rdev->sb_loaded = 1; | |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
fd01b88c | 807 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b | 808 | { |
81f382f9 | 809 | int i; |
b12d437b JB |
810 | uint64_t failed_devices; |
811 | struct dm_raid_superblock *sb; | |
81f382f9 | 812 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
b12d437b JB |
813 | |
814 | sb = page_address(rdev->sb_page); | |
815 | failed_devices = le64_to_cpu(sb->failed_devices); | |
816 | ||
81f382f9 JB |
817 | for (i = 0; i < mddev->raid_disks; i++) |
818 | if (!rs->dev[i].data_dev || | |
819 | test_bit(Faulty, &(rs->dev[i].rdev.flags))) | |
820 | failed_devices |= (1ULL << i); | |
b12d437b | 821 | |
40d43c4b | 822 | memset(sb + 1, 0, rdev->sb_size - sizeof(*sb)); |
b12d437b JB |
823 | |
824 | sb->magic = cpu_to_le32(DM_RAID_MAGIC); | |
825 | sb->features = cpu_to_le32(0); /* No features yet */ | |
826 | ||
827 | sb->num_devices = cpu_to_le32(mddev->raid_disks); | |
828 | sb->array_position = cpu_to_le32(rdev->raid_disk); | |
829 | ||
830 | sb->events = cpu_to_le64(mddev->events); | |
831 | sb->failed_devices = cpu_to_le64(failed_devices); | |
832 | ||
833 | sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
834 | sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); | |
835 | ||
836 | sb->level = cpu_to_le32(mddev->level); | |
837 | sb->layout = cpu_to_le32(mddev->layout); | |
838 | sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); | |
839 | } | |
840 | ||
841 | /* | |
842 | * super_load | |
843 | * | |
844 | * This function creates a superblock if one is not found on the device | |
845 | * and will decide which superblock to use if there's a choice. | |
846 | * | |
847 | * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise | |
848 | */ | |
3cb03002 | 849 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
b12d437b JB |
850 | { |
851 | int ret; | |
852 | struct dm_raid_superblock *sb; | |
853 | struct dm_raid_superblock *refsb; | |
854 | uint64_t events_sb, events_refsb; | |
855 | ||
856 | rdev->sb_start = 0; | |
40d43c4b HM |
857 | rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev); |
858 | if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) { | |
859 | DMERR("superblock size of a logical block is no longer valid"); | |
860 | return -EINVAL; | |
861 | } | |
b12d437b JB |
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 | ||
c76d53f4 | 949 | if (!(rs->ctr_flags & (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC))) |
b12d437b JB |
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 | ||
0cf45031 | 1028 | static int super_validate(struct raid_set *rs, struct md_rdev *rdev) |
b12d437b | 1029 | { |
0cf45031 | 1030 | struct mddev *mddev = &rs->md; |
b12d437b JB |
1031 | struct dm_raid_superblock *sb = page_address(rdev->sb_page); |
1032 | ||
1033 | /* | |
1034 | * If mddev->events is not set, we know we have not yet initialized | |
1035 | * the array. | |
1036 | */ | |
1037 | if (!mddev->events && super_init_validation(mddev, rdev)) | |
1038 | return -EINVAL; | |
1039 | ||
0cf45031 HM |
1040 | /* Enable bitmap creation for RAID levels != 0 */ |
1041 | mddev->bitmap_info.offset = (rs->raid_type->level) ? to_sector(4096) : 0; | |
1042 | rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset; | |
1043 | ||
b12d437b JB |
1044 | if (!test_bit(FirstUse, &rdev->flags)) { |
1045 | rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); | |
1046 | if (rdev->recovery_offset != MaxSector) | |
1047 | clear_bit(In_sync, &rdev->flags); | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * If a device comes back, set it as not In_sync and no longer faulty. | |
1052 | */ | |
1053 | if (test_bit(Faulty, &rdev->flags)) { | |
1054 | clear_bit(Faulty, &rdev->flags); | |
1055 | clear_bit(In_sync, &rdev->flags); | |
1056 | rdev->saved_raid_disk = rdev->raid_disk; | |
1057 | rdev->recovery_offset = 0; | |
1058 | } | |
1059 | ||
1060 | clear_bit(FirstUse, &rdev->flags); | |
1061 | ||
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * Analyse superblocks and select the freshest. | |
1067 | */ | |
1068 | static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) | |
1069 | { | |
1070 | int ret; | |
0447568f | 1071 | struct raid_dev *dev; |
a9ad8526 | 1072 | struct md_rdev *rdev, *tmp, *freshest; |
fd01b88c | 1073 | struct mddev *mddev = &rs->md; |
b12d437b JB |
1074 | |
1075 | freshest = NULL; | |
a9ad8526 | 1076 | rdev_for_each_safe(rdev, tmp, mddev) { |
761becff | 1077 | /* |
c76d53f4 | 1078 | * Skipping super_load due to CTR_FLAG_SYNC will cause |
761becff JB |
1079 | * the array to undergo initialization again as |
1080 | * though it were new. This is the intended effect | |
1081 | * of the "sync" directive. | |
1082 | * | |
1083 | * When reshaping capability is added, we must ensure | |
1084 | * that the "sync" directive is disallowed during the | |
1085 | * reshape. | |
1086 | */ | |
0cf45031 HM |
1087 | rdev->sectors = to_sector(i_size_read(rdev->bdev->bd_inode)); |
1088 | ||
c76d53f4 | 1089 | if (rs->ctr_flags & CTR_FLAG_SYNC) |
761becff JB |
1090 | continue; |
1091 | ||
b12d437b JB |
1092 | if (!rdev->meta_bdev) |
1093 | continue; | |
1094 | ||
1095 | ret = super_load(rdev, freshest); | |
1096 | ||
1097 | switch (ret) { | |
1098 | case 1: | |
1099 | freshest = rdev; | |
1100 | break; | |
1101 | case 0: | |
1102 | break; | |
1103 | default: | |
0447568f | 1104 | dev = container_of(rdev, struct raid_dev, rdev); |
55ebbb59 JB |
1105 | if (dev->meta_dev) |
1106 | dm_put_device(ti, dev->meta_dev); | |
0447568f | 1107 | |
55ebbb59 JB |
1108 | dev->meta_dev = NULL; |
1109 | rdev->meta_bdev = NULL; | |
0447568f | 1110 | |
55ebbb59 JB |
1111 | if (rdev->sb_page) |
1112 | put_page(rdev->sb_page); | |
0447568f | 1113 | |
55ebbb59 | 1114 | rdev->sb_page = NULL; |
0447568f | 1115 | |
55ebbb59 | 1116 | rdev->sb_loaded = 0; |
0447568f | 1117 | |
55ebbb59 JB |
1118 | /* |
1119 | * We might be able to salvage the data device | |
1120 | * even though the meta device has failed. For | |
1121 | * now, we behave as though '- -' had been | |
1122 | * set for this device in the table. | |
1123 | */ | |
1124 | if (dev->data_dev) | |
1125 | dm_put_device(ti, dev->data_dev); | |
0447568f | 1126 | |
55ebbb59 JB |
1127 | dev->data_dev = NULL; |
1128 | rdev->bdev = NULL; | |
0447568f | 1129 | |
55ebbb59 | 1130 | list_del(&rdev->same_set); |
b12d437b JB |
1131 | } |
1132 | } | |
1133 | ||
1134 | if (!freshest) | |
1135 | return 0; | |
1136 | ||
55ebbb59 JB |
1137 | if (validate_raid_redundancy(rs)) { |
1138 | rs->ti->error = "Insufficient redundancy to activate array"; | |
1139 | return -EINVAL; | |
1140 | } | |
1141 | ||
b12d437b JB |
1142 | /* |
1143 | * Validation of the freshest device provides the source of | |
1144 | * validation for the remaining devices. | |
1145 | */ | |
1146 | ti->error = "Unable to assemble array: Invalid superblocks"; | |
0cf45031 | 1147 | if (super_validate(rs, freshest)) |
b12d437b JB |
1148 | return -EINVAL; |
1149 | ||
dafb20fa | 1150 | rdev_for_each(rdev, mddev) |
0cf45031 | 1151 | if ((rdev != freshest) && super_validate(rs, rdev)) |
b12d437b JB |
1152 | return -EINVAL; |
1153 | ||
1154 | return 0; | |
1155 | } | |
1156 | ||
75b8e04b | 1157 | /* |
48cf06bc HM |
1158 | * Enable/disable discard support on RAID set depending on |
1159 | * RAID level and discard properties of underlying RAID members. | |
75b8e04b HM |
1160 | */ |
1161 | static void configure_discard_support(struct dm_target *ti, struct raid_set *rs) | |
1162 | { | |
48cf06bc HM |
1163 | int i; |
1164 | bool raid456; | |
1165 | ||
75b8e04b HM |
1166 | /* Assume discards not supported until after checks below. */ |
1167 | ti->discards_supported = false; | |
1168 | ||
1169 | /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */ | |
48cf06bc | 1170 | raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6); |
75b8e04b | 1171 | |
48cf06bc | 1172 | for (i = 0; i < rs->md.raid_disks; i++) { |
d20c4b08 | 1173 | struct request_queue *q; |
48cf06bc | 1174 | |
d20c4b08 HM |
1175 | if (!rs->dev[i].rdev.bdev) |
1176 | continue; | |
1177 | ||
1178 | q = bdev_get_queue(rs->dev[i].rdev.bdev); | |
48cf06bc HM |
1179 | if (!q || !blk_queue_discard(q)) |
1180 | return; | |
1181 | ||
1182 | if (raid456) { | |
1183 | if (!q->limits.discard_zeroes_data) | |
1184 | return; | |
1185 | if (!devices_handle_discard_safely) { | |
1186 | DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty."); | |
1187 | DMERR("Set dm-raid.devices_handle_discard_safely=Y to override."); | |
1188 | return; | |
1189 | } | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | /* All RAID members properly support discards */ | |
75b8e04b HM |
1194 | ti->discards_supported = true; |
1195 | ||
1196 | /* | |
1197 | * RAID1 and RAID10 personalities require bio splitting, | |
48cf06bc | 1198 | * RAID0/4/5/6 don't and process large discard bios properly. |
75b8e04b | 1199 | */ |
48cf06bc | 1200 | ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10); |
75b8e04b HM |
1201 | ti->num_discard_bios = 1; |
1202 | } | |
1203 | ||
9d09e663 N |
1204 | /* |
1205 | * Construct a RAID4/5/6 mapping: | |
1206 | * Args: | |
1207 | * <raid_type> <#raid_params> <raid_params> \ | |
1208 | * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> } | |
1209 | * | |
9d09e663 N |
1210 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
1211 | * details on possible <raid_params>. | |
1212 | */ | |
1213 | static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) | |
1214 | { | |
1215 | int ret; | |
1216 | struct raid_type *rt; | |
1217 | unsigned long num_raid_params, num_raid_devs; | |
1218 | struct raid_set *rs = NULL; | |
1219 | ||
1220 | /* Must have at least <raid_type> <#raid_params> */ | |
1221 | if (argc < 2) { | |
1222 | ti->error = "Too few arguments"; | |
1223 | return -EINVAL; | |
1224 | } | |
1225 | ||
1226 | /* raid type */ | |
1227 | rt = get_raid_type(argv[0]); | |
1228 | if (!rt) { | |
1229 | ti->error = "Unrecognised raid_type"; | |
1230 | return -EINVAL; | |
1231 | } | |
1232 | argc--; | |
1233 | argv++; | |
1234 | ||
1235 | /* number of RAID parameters */ | |
b29bebd6 | 1236 | if (kstrtoul(argv[0], 10, &num_raid_params) < 0) { |
9d09e663 N |
1237 | ti->error = "Cannot understand number of RAID parameters"; |
1238 | return -EINVAL; | |
1239 | } | |
1240 | argc--; | |
1241 | argv++; | |
1242 | ||
1243 | /* Skip over RAID params for now and find out # of devices */ | |
3ca5a21a | 1244 | if (num_raid_params >= argc) { |
9d09e663 N |
1245 | ti->error = "Arguments do not agree with counts given"; |
1246 | return -EINVAL; | |
1247 | } | |
1248 | ||
b29bebd6 | 1249 | if ((kstrtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || |
c76d53f4 | 1250 | (num_raid_devs > MAX_RAID_DEVICES)) { |
9d09e663 N |
1251 | ti->error = "Cannot understand number of raid devices"; |
1252 | return -EINVAL; | |
1253 | } | |
1254 | ||
3ca5a21a DC |
1255 | argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */ |
1256 | if (argc != (num_raid_devs * 2)) { | |
1257 | ti->error = "Supplied RAID devices does not match the count given"; | |
1258 | return -EINVAL; | |
1259 | } | |
1260 | ||
9d09e663 N |
1261 | rs = context_alloc(ti, rt, (unsigned)num_raid_devs); |
1262 | if (IS_ERR(rs)) | |
1263 | return PTR_ERR(rs); | |
1264 | ||
1265 | ret = parse_raid_params(rs, argv, (unsigned)num_raid_params); | |
1266 | if (ret) | |
1267 | goto bad; | |
1268 | ||
9d09e663 N |
1269 | argv += num_raid_params + 1; |
1270 | ||
9d09e663 N |
1271 | ret = dev_parms(rs, argv); |
1272 | if (ret) | |
1273 | goto bad; | |
1274 | ||
b12d437b JB |
1275 | rs->md.sync_super = super_sync; |
1276 | ret = analyse_superblocks(ti, rs); | |
1277 | if (ret) | |
1278 | goto bad; | |
1279 | ||
9d09e663 | 1280 | INIT_WORK(&rs->md.event_work, do_table_event); |
9d09e663 | 1281 | ti->private = rs; |
55a62eef | 1282 | ti->num_flush_bios = 1; |
9d09e663 | 1283 | |
75b8e04b HM |
1284 | /* |
1285 | * Disable/enable discard support on RAID set. | |
1286 | */ | |
1287 | configure_discard_support(ti, rs); | |
1288 | ||
0cf45031 HM |
1289 | /* Has to be held on running the array */ |
1290 | mddev_lock_nointr(&rs->md); | |
9d09e663 N |
1291 | ret = md_run(&rs->md); |
1292 | rs->md.in_sync = 0; /* Assume already marked dirty */ | |
0cf45031 | 1293 | mddev_unlock(&rs->md); |
9d09e663 N |
1294 | |
1295 | if (ret) { | |
1296 | ti->error = "Fail to run raid array"; | |
1297 | goto bad; | |
1298 | } | |
1299 | ||
63f33b8d JB |
1300 | if (ti->len != rs->md.array_sectors) { |
1301 | ti->error = "Array size does not match requested target length"; | |
1302 | ret = -EINVAL; | |
1303 | goto size_mismatch; | |
1304 | } | |
9d09e663 | 1305 | rs->callbacks.congested_fn = raid_is_congested; |
9d09e663 N |
1306 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
1307 | ||
32737279 | 1308 | mddev_suspend(&rs->md); |
9d09e663 N |
1309 | return 0; |
1310 | ||
63f33b8d JB |
1311 | size_mismatch: |
1312 | md_stop(&rs->md); | |
9d09e663 N |
1313 | bad: |
1314 | context_free(rs); | |
1315 | ||
1316 | return ret; | |
1317 | } | |
1318 | ||
1319 | static void raid_dtr(struct dm_target *ti) | |
1320 | { | |
1321 | struct raid_set *rs = ti->private; | |
1322 | ||
1323 | list_del_init(&rs->callbacks.list); | |
1324 | md_stop(&rs->md); | |
1325 | context_free(rs); | |
1326 | } | |
1327 | ||
7de3ee57 | 1328 | static int raid_map(struct dm_target *ti, struct bio *bio) |
9d09e663 N |
1329 | { |
1330 | struct raid_set *rs = ti->private; | |
fd01b88c | 1331 | struct mddev *mddev = &rs->md; |
9d09e663 N |
1332 | |
1333 | mddev->pers->make_request(mddev, bio); | |
1334 | ||
1335 | return DM_MAPIO_SUBMITTED; | |
1336 | } | |
1337 | ||
be83651f JB |
1338 | static const char *decipher_sync_action(struct mddev *mddev) |
1339 | { | |
1340 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
1341 | return "frozen"; | |
1342 | ||
1343 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1344 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { | |
1345 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
1346 | return "reshape"; | |
1347 | ||
1348 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
1349 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1350 | return "resync"; | |
1351 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
1352 | return "check"; | |
1353 | return "repair"; | |
1354 | } | |
1355 | ||
1356 | if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) | |
1357 | return "recover"; | |
1358 | } | |
1359 | ||
1360 | return "idle"; | |
1361 | } | |
1362 | ||
fd7c092e MP |
1363 | static void raid_status(struct dm_target *ti, status_type_t type, |
1364 | unsigned status_flags, char *result, unsigned maxlen) | |
9d09e663 N |
1365 | { |
1366 | struct raid_set *rs = ti->private; | |
1367 | unsigned raid_param_cnt = 1; /* at least 1 for chunksize */ | |
1368 | unsigned sz = 0; | |
2e727c3c | 1369 | int i, array_in_sync = 0; |
9d09e663 N |
1370 | sector_t sync; |
1371 | ||
1372 | switch (type) { | |
1373 | case STATUSTYPE_INFO: | |
1374 | DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks); | |
1375 | ||
0cf45031 HM |
1376 | if (rs->raid_type->level) { |
1377 | if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery)) | |
1378 | sync = rs->md.curr_resync_completed; | |
1379 | else | |
1380 | sync = rs->md.recovery_cp; | |
1381 | ||
1382 | if (sync >= rs->md.resync_max_sectors) { | |
1383 | /* | |
1384 | * Sync complete. | |
1385 | */ | |
1386 | array_in_sync = 1; | |
1387 | sync = rs->md.resync_max_sectors; | |
1388 | } else if (test_bit(MD_RECOVERY_REQUESTED, &rs->md.recovery)) { | |
1389 | /* | |
1390 | * If "check" or "repair" is occurring, the array has | |
1391 | * undergone and initial sync and the health characters | |
1392 | * should not be 'a' anymore. | |
1393 | */ | |
1394 | array_in_sync = 1; | |
1395 | } else { | |
1396 | /* | |
1397 | * The array may be doing an initial sync, or it may | |
1398 | * be rebuilding individual components. If all the | |
1399 | * devices are In_sync, then it is the array that is | |
1400 | * being initialized. | |
1401 | */ | |
1402 | for (i = 0; i < rs->md.raid_disks; i++) | |
1403 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1404 | array_in_sync = 1; | |
1405 | } | |
1406 | } else { | |
1407 | /* RAID0 */ | |
2e727c3c | 1408 | array_in_sync = 1; |
9d09e663 | 1409 | sync = rs->md.resync_max_sectors; |
2e727c3c | 1410 | } |
be83651f | 1411 | |
2e727c3c JB |
1412 | /* |
1413 | * Status characters: | |
1414 | * 'D' = Dead/Failed device | |
1415 | * 'a' = Alive but not in-sync | |
1416 | * 'A' = Alive and in-sync | |
1417 | */ | |
1418 | for (i = 0; i < rs->md.raid_disks; i++) { | |
1419 | if (test_bit(Faulty, &rs->dev[i].rdev.flags)) | |
1420 | DMEMIT("D"); | |
1421 | else if (!array_in_sync || | |
1422 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1423 | DMEMIT("a"); | |
1424 | else | |
1425 | DMEMIT("A"); | |
1426 | } | |
9d09e663 | 1427 | |
2e727c3c JB |
1428 | /* |
1429 | * In-sync ratio: | |
1430 | * The in-sync ratio shows the progress of: | |
1431 | * - Initializing the array | |
1432 | * - Rebuilding a subset of devices of the array | |
1433 | * The user can distinguish between the two by referring | |
1434 | * to the status characters. | |
1435 | */ | |
9d09e663 N |
1436 | DMEMIT(" %llu/%llu", |
1437 | (unsigned long long) sync, | |
1438 | (unsigned long long) rs->md.resync_max_sectors); | |
1439 | ||
be83651f JB |
1440 | /* |
1441 | * Sync action: | |
1442 | * See Documentation/device-mapper/dm-raid.c for | |
1443 | * information on each of these states. | |
1444 | */ | |
1445 | DMEMIT(" %s", decipher_sync_action(&rs->md)); | |
1446 | ||
1447 | /* | |
1448 | * resync_mismatches/mismatch_cnt | |
1449 | * This field shows the number of discrepancies found when | |
1450 | * performing a "check" of the array. | |
1451 | */ | |
1452 | DMEMIT(" %llu", | |
c4a39551 | 1453 | (strcmp(rs->md.last_sync_action, "check")) ? 0 : |
be83651f JB |
1454 | (unsigned long long) |
1455 | atomic64_read(&rs->md.resync_mismatches)); | |
9d09e663 N |
1456 | break; |
1457 | case STATUSTYPE_TABLE: | |
1458 | /* The string you would use to construct this array */ | |
46bed2b5 | 1459 | for (i = 0; i < rs->md.raid_disks; i++) { |
c76d53f4 | 1460 | if ((rs->ctr_flags & CTR_FLAG_REBUILD) && |
13c87583 | 1461 | rs->dev[i].data_dev && |
9d09e663 | 1462 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
13c87583 | 1463 | raid_param_cnt += 2; /* for rebuilds */ |
46bed2b5 JB |
1464 | if (rs->dev[i].data_dev && |
1465 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1466 | raid_param_cnt += 2; | |
1467 | } | |
9d09e663 | 1468 | |
c76d53f4 HM |
1469 | raid_param_cnt += (hweight32(rs->ctr_flags & ~CTR_FLAG_REBUILD) * 2); |
1470 | if (rs->ctr_flags & (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)) | |
9d09e663 N |
1471 | raid_param_cnt--; |
1472 | ||
1473 | DMEMIT("%s %u %u", rs->raid_type->name, | |
1474 | raid_param_cnt, rs->md.chunk_sectors); | |
1475 | ||
c76d53f4 | 1476 | if ((rs->ctr_flags & CTR_FLAG_SYNC) && |
9d09e663 N |
1477 | (rs->md.recovery_cp == MaxSector)) |
1478 | DMEMIT(" sync"); | |
c76d53f4 | 1479 | if (rs->ctr_flags & CTR_FLAG_NOSYNC) |
9d09e663 N |
1480 | DMEMIT(" nosync"); |
1481 | ||
1482 | for (i = 0; i < rs->md.raid_disks; i++) | |
c76d53f4 | 1483 | if ((rs->ctr_flags & CTR_FLAG_REBUILD) && |
13c87583 | 1484 | rs->dev[i].data_dev && |
9d09e663 N |
1485 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
1486 | DMEMIT(" rebuild %u", i); | |
1487 | ||
c76d53f4 | 1488 | if (rs->ctr_flags & CTR_FLAG_DAEMON_SLEEP) |
9d09e663 N |
1489 | DMEMIT(" daemon_sleep %lu", |
1490 | rs->md.bitmap_info.daemon_sleep); | |
1491 | ||
c76d53f4 | 1492 | if (rs->ctr_flags & CTR_FLAG_MIN_RECOVERY_RATE) |
9d09e663 N |
1493 | DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min); |
1494 | ||
c76d53f4 | 1495 | if (rs->ctr_flags & CTR_FLAG_MAX_RECOVERY_RATE) |
9d09e663 N |
1496 | DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max); |
1497 | ||
46bed2b5 JB |
1498 | for (i = 0; i < rs->md.raid_disks; i++) |
1499 | if (rs->dev[i].data_dev && | |
1500 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1501 | DMEMIT(" write_mostly %u", i); | |
1502 | ||
c76d53f4 | 1503 | if (rs->ctr_flags & CTR_FLAG_MAX_WRITE_BEHIND) |
9d09e663 N |
1504 | DMEMIT(" max_write_behind %lu", |
1505 | rs->md.bitmap_info.max_write_behind); | |
1506 | ||
c76d53f4 | 1507 | if (rs->ctr_flags & CTR_FLAG_STRIPE_CACHE) { |
d1688a6d | 1508 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1509 | |
1510 | /* convert from kiB to sectors */ | |
1511 | DMEMIT(" stripe_cache %d", | |
1512 | conf ? conf->max_nr_stripes * 2 : 0); | |
1513 | } | |
1514 | ||
c76d53f4 | 1515 | if (rs->ctr_flags & CTR_FLAG_REGION_SIZE) |
c1084561 JB |
1516 | DMEMIT(" region_size %lu", |
1517 | rs->md.bitmap_info.chunksize >> 9); | |
1518 | ||
c76d53f4 | 1519 | if (rs->ctr_flags & CTR_FLAG_RAID10_COPIES) |
63f33b8d JB |
1520 | DMEMIT(" raid10_copies %u", |
1521 | raid10_md_layout_to_copies(rs->md.layout)); | |
1522 | ||
c76d53f4 | 1523 | if (rs->ctr_flags & CTR_FLAG_RAID10_FORMAT) |
fe5d2f4a JB |
1524 | DMEMIT(" raid10_format %s", |
1525 | raid10_md_layout_to_format(rs->md.layout)); | |
63f33b8d | 1526 | |
9d09e663 N |
1527 | DMEMIT(" %d", rs->md.raid_disks); |
1528 | for (i = 0; i < rs->md.raid_disks; i++) { | |
b12d437b JB |
1529 | if (rs->dev[i].meta_dev) |
1530 | DMEMIT(" %s", rs->dev[i].meta_dev->name); | |
1531 | else | |
1532 | DMEMIT(" -"); | |
9d09e663 N |
1533 | |
1534 | if (rs->dev[i].data_dev) | |
1535 | DMEMIT(" %s", rs->dev[i].data_dev->name); | |
1536 | else | |
1537 | DMEMIT(" -"); | |
1538 | } | |
1539 | } | |
9d09e663 N |
1540 | } |
1541 | ||
be83651f JB |
1542 | static int raid_message(struct dm_target *ti, unsigned argc, char **argv) |
1543 | { | |
1544 | struct raid_set *rs = ti->private; | |
1545 | struct mddev *mddev = &rs->md; | |
1546 | ||
1547 | if (!strcasecmp(argv[0], "reshape")) { | |
1548 | DMERR("Reshape not supported."); | |
1549 | return -EINVAL; | |
1550 | } | |
1551 | ||
1552 | if (!mddev->pers || !mddev->pers->sync_request) | |
1553 | return -EINVAL; | |
1554 | ||
1555 | if (!strcasecmp(argv[0], "frozen")) | |
1556 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
1557 | else | |
1558 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
1559 | ||
1560 | if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) { | |
1561 | if (mddev->sync_thread) { | |
1562 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1563 | md_reap_sync_thread(mddev); | |
1564 | } | |
1565 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1566 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
1567 | return -EBUSY; | |
1568 | else if (!strcasecmp(argv[0], "resync")) | |
1569 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1570 | else if (!strcasecmp(argv[0], "recover")) { | |
1571 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
1572 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1573 | } else { | |
1574 | if (!strcasecmp(argv[0], "check")) | |
1575 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
1576 | else if (!!strcasecmp(argv[0], "repair")) | |
1577 | return -EINVAL; | |
1578 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
1579 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
1580 | } | |
1581 | if (mddev->ro == 2) { | |
1582 | /* A write to sync_action is enough to justify | |
1583 | * canceling read-auto mode | |
1584 | */ | |
1585 | mddev->ro = 0; | |
1586 | if (!mddev->suspended) | |
1587 | md_wakeup_thread(mddev->sync_thread); | |
1588 | } | |
1589 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1590 | if (!mddev->suspended) | |
1591 | md_wakeup_thread(mddev->thread); | |
1592 | ||
1593 | return 0; | |
1594 | } | |
1595 | ||
1596 | static int raid_iterate_devices(struct dm_target *ti, | |
1597 | iterate_devices_callout_fn fn, void *data) | |
9d09e663 N |
1598 | { |
1599 | struct raid_set *rs = ti->private; | |
1600 | unsigned i; | |
1601 | int ret = 0; | |
1602 | ||
1603 | for (i = 0; !ret && i < rs->md.raid_disks; i++) | |
1604 | if (rs->dev[i].data_dev) | |
1605 | ret = fn(ti, | |
1606 | rs->dev[i].data_dev, | |
1607 | 0, /* No offset on data devs */ | |
1608 | rs->md.dev_sectors, | |
1609 | data); | |
1610 | ||
1611 | return ret; | |
1612 | } | |
1613 | ||
1614 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) | |
1615 | { | |
1616 | struct raid_set *rs = ti->private; | |
1617 | unsigned chunk_size = rs->md.chunk_sectors << 9; | |
d1688a6d | 1618 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1619 | |
1620 | blk_limits_io_min(limits, chunk_size); | |
1621 | blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); | |
1622 | } | |
1623 | ||
1624 | static void raid_presuspend(struct dm_target *ti) | |
1625 | { | |
1626 | struct raid_set *rs = ti->private; | |
1627 | ||
1628 | md_stop_writes(&rs->md); | |
1629 | } | |
1630 | ||
1631 | static void raid_postsuspend(struct dm_target *ti) | |
1632 | { | |
1633 | struct raid_set *rs = ti->private; | |
1634 | ||
1635 | mddev_suspend(&rs->md); | |
1636 | } | |
1637 | ||
f381e71b | 1638 | static void attempt_restore_of_faulty_devices(struct raid_set *rs) |
9d09e663 | 1639 | { |
9092c02d JB |
1640 | int i; |
1641 | uint64_t failed_devices, cleared_failed_devices = 0; | |
1642 | unsigned long flags; | |
1643 | struct dm_raid_superblock *sb; | |
9092c02d | 1644 | struct md_rdev *r; |
9d09e663 | 1645 | |
f381e71b JB |
1646 | for (i = 0; i < rs->md.raid_disks; i++) { |
1647 | r = &rs->dev[i].rdev; | |
1648 | if (test_bit(Faulty, &r->flags) && r->sb_page && | |
1649 | sync_page_io(r, 0, r->sb_size, r->sb_page, READ, 1)) { | |
1650 | DMINFO("Faulty %s device #%d has readable super block." | |
1651 | " Attempting to revive it.", | |
1652 | rs->raid_type->name, i); | |
a4dc163a JB |
1653 | |
1654 | /* | |
1655 | * Faulty bit may be set, but sometimes the array can | |
1656 | * be suspended before the personalities can respond | |
1657 | * by removing the device from the array (i.e. calling | |
1658 | * 'hot_remove_disk'). If they haven't yet removed | |
1659 | * the failed device, its 'raid_disk' number will be | |
1660 | * '>= 0' - meaning we must call this function | |
1661 | * ourselves. | |
1662 | */ | |
1663 | if ((r->raid_disk >= 0) && | |
1664 | (r->mddev->pers->hot_remove_disk(r->mddev, r) != 0)) | |
1665 | /* Failed to revive this device, try next */ | |
1666 | continue; | |
1667 | ||
f381e71b JB |
1668 | r->raid_disk = i; |
1669 | r->saved_raid_disk = i; | |
1670 | flags = r->flags; | |
1671 | clear_bit(Faulty, &r->flags); | |
1672 | clear_bit(WriteErrorSeen, &r->flags); | |
1673 | clear_bit(In_sync, &r->flags); | |
1674 | if (r->mddev->pers->hot_add_disk(r->mddev, r)) { | |
1675 | r->raid_disk = -1; | |
1676 | r->saved_raid_disk = -1; | |
1677 | r->flags = flags; | |
1678 | } else { | |
1679 | r->recovery_offset = 0; | |
1680 | cleared_failed_devices |= 1 << i; | |
1681 | } | |
1682 | } | |
1683 | } | |
1684 | if (cleared_failed_devices) { | |
1685 | rdev_for_each(r, &rs->md) { | |
1686 | sb = page_address(r->sb_page); | |
1687 | failed_devices = le64_to_cpu(sb->failed_devices); | |
1688 | failed_devices &= ~cleared_failed_devices; | |
1689 | sb->failed_devices = cpu_to_le64(failed_devices); | |
1690 | } | |
1691 | } | |
1692 | } | |
1693 | ||
1694 | static void raid_resume(struct dm_target *ti) | |
1695 | { | |
1696 | struct raid_set *rs = ti->private; | |
1697 | ||
0cf45031 HM |
1698 | if (rs->raid_type->level) { |
1699 | set_bit(MD_CHANGE_DEVS, &rs->md.flags); | |
1700 | ||
1701 | if (!rs->bitmap_loaded) { | |
1702 | bitmap_load(&rs->md); | |
1703 | rs->bitmap_loaded = 1; | |
1704 | } else { | |
1705 | /* | |
1706 | * A secondary resume while the device is active. | |
1707 | * Take this opportunity to check whether any failed | |
1708 | * devices are reachable again. | |
1709 | */ | |
1710 | attempt_restore_of_faulty_devices(rs); | |
1711 | } | |
1712 | ||
1713 | clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); | |
47525e59 | 1714 | } |
34f8ac6d | 1715 | |
9d09e663 N |
1716 | mddev_resume(&rs->md); |
1717 | } | |
1718 | ||
1719 | static struct target_type raid_target = { | |
1720 | .name = "raid", | |
0cf45031 | 1721 | .version = {1, 7, 0}, |
9d09e663 N |
1722 | .module = THIS_MODULE, |
1723 | .ctr = raid_ctr, | |
1724 | .dtr = raid_dtr, | |
1725 | .map = raid_map, | |
1726 | .status = raid_status, | |
be83651f | 1727 | .message = raid_message, |
9d09e663 N |
1728 | .iterate_devices = raid_iterate_devices, |
1729 | .io_hints = raid_io_hints, | |
1730 | .presuspend = raid_presuspend, | |
1731 | .postsuspend = raid_postsuspend, | |
1732 | .resume = raid_resume, | |
1733 | }; | |
1734 | ||
1735 | static int __init dm_raid_init(void) | |
1736 | { | |
fe5d2f4a JB |
1737 | DMINFO("Loading target version %u.%u.%u", |
1738 | raid_target.version[0], | |
1739 | raid_target.version[1], | |
1740 | raid_target.version[2]); | |
9d09e663 N |
1741 | return dm_register_target(&raid_target); |
1742 | } | |
1743 | ||
1744 | static void __exit dm_raid_exit(void) | |
1745 | { | |
1746 | dm_unregister_target(&raid_target); | |
1747 | } | |
1748 | ||
1749 | module_init(dm_raid_init); | |
1750 | module_exit(dm_raid_exit); | |
1751 | ||
48cf06bc HM |
1752 | module_param(devices_handle_discard_safely, bool, 0644); |
1753 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
1754 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
1755 | ||
9d09e663 | 1756 | MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); |
63f33b8d JB |
1757 | MODULE_ALIAS("dm-raid1"); |
1758 | MODULE_ALIAS("dm-raid10"); | |
9d09e663 N |
1759 | MODULE_ALIAS("dm-raid4"); |
1760 | MODULE_ALIAS("dm-raid5"); | |
1761 | MODULE_ALIAS("dm-raid6"); | |
1762 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); | |
1763 | MODULE_LICENSE("GPL"); |