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Commit | Line | Data |
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9d09e663 N |
1 | /* |
2 | * Copyright (C) 2010-2011 Neil Brown | |
75b8e04b | 3 | * Copyright (C) 2010-2014 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 N |
19 | #define DM_MSG_PREFIX "raid" |
20 | ||
48cf06bc HM |
21 | static bool devices_handle_discard_safely = false; |
22 | ||
9d09e663 | 23 | /* |
b12d437b JB |
24 | * The following flags are used by dm-raid.c to set up the array state. |
25 | * They must be cleared before md_run is called. | |
9d09e663 | 26 | */ |
b12d437b | 27 | #define FirstUse 10 /* rdev flag */ |
9d09e663 N |
28 | |
29 | struct raid_dev { | |
30 | /* | |
31 | * Two DM devices, one to hold metadata and one to hold the | |
32 | * actual data/parity. The reason for this is to not confuse | |
33 | * ti->len and give more flexibility in altering size and | |
34 | * characteristics. | |
35 | * | |
36 | * While it is possible for this device to be associated | |
37 | * with a different physical device than the data_dev, it | |
38 | * is intended for it to be the same. | |
39 | * |--------- Physical Device ---------| | |
40 | * |- meta_dev -|------ data_dev ------| | |
41 | */ | |
42 | struct dm_dev *meta_dev; | |
43 | struct dm_dev *data_dev; | |
3cb03002 | 44 | struct md_rdev rdev; |
9d09e663 N |
45 | }; |
46 | ||
47 | /* | |
48 | * Flags for rs->print_flags field. | |
49 | */ | |
13c87583 JB |
50 | #define DMPF_SYNC 0x1 |
51 | #define DMPF_NOSYNC 0x2 | |
52 | #define DMPF_REBUILD 0x4 | |
53 | #define DMPF_DAEMON_SLEEP 0x8 | |
54 | #define DMPF_MIN_RECOVERY_RATE 0x10 | |
55 | #define DMPF_MAX_RECOVERY_RATE 0x20 | |
56 | #define DMPF_MAX_WRITE_BEHIND 0x40 | |
57 | #define DMPF_STRIPE_CACHE 0x80 | |
63f33b8d JB |
58 | #define DMPF_REGION_SIZE 0x100 |
59 | #define DMPF_RAID10_COPIES 0x200 | |
60 | #define DMPF_RAID10_FORMAT 0x400 | |
61 | ||
9d09e663 N |
62 | struct raid_set { |
63 | struct dm_target *ti; | |
64 | ||
34f8ac6d JB |
65 | uint32_t bitmap_loaded; |
66 | uint32_t print_flags; | |
9d09e663 | 67 | |
fd01b88c | 68 | struct mddev md; |
9d09e663 N |
69 | struct raid_type *raid_type; |
70 | struct dm_target_callbacks callbacks; | |
71 | ||
72 | struct raid_dev dev[0]; | |
73 | }; | |
74 | ||
75 | /* Supported raid types and properties. */ | |
76 | static struct raid_type { | |
77 | const char *name; /* RAID algorithm. */ | |
78 | const char *descr; /* Descriptor text for logging. */ | |
79 | const unsigned parity_devs; /* # of parity devices. */ | |
80 | const unsigned minimal_devs; /* minimal # of devices in set. */ | |
81 | const unsigned level; /* RAID level. */ | |
82 | const unsigned algorithm; /* RAID algorithm. */ | |
83 | } raid_types[] = { | |
32737279 | 84 | {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */}, |
63f33b8d | 85 | {"raid10", "RAID10 (striped mirrors)", 0, 2, 10, UINT_MAX /* Varies */}, |
9d09e663 N |
86 | {"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, |
87 | {"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC}, | |
88 | {"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC}, | |
89 | {"raid5_ls", "RAID5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, | |
90 | {"raid5_rs", "RAID5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, | |
91 | {"raid6_zr", "RAID6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART}, | |
92 | {"raid6_nr", "RAID6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART}, | |
93 | {"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE} | |
94 | }; | |
95 | ||
fe5d2f4a JB |
96 | static char *raid10_md_layout_to_format(int layout) |
97 | { | |
98 | /* | |
99 | * Bit 16 and 17 stand for "offset" and "use_far_sets" | |
100 | * Refer to MD's raid10.c for details | |
101 | */ | |
102 | if ((layout & 0x10000) && (layout & 0x20000)) | |
103 | return "offset"; | |
104 | ||
105 | if ((layout & 0xFF) > 1) | |
106 | return "near"; | |
107 | ||
108 | return "far"; | |
109 | } | |
110 | ||
63f33b8d JB |
111 | static unsigned raid10_md_layout_to_copies(int layout) |
112 | { | |
fe5d2f4a JB |
113 | if ((layout & 0xFF) > 1) |
114 | return layout & 0xFF; | |
115 | return (layout >> 8) & 0xFF; | |
63f33b8d JB |
116 | } |
117 | ||
118 | static int raid10_format_to_md_layout(char *format, unsigned copies) | |
119 | { | |
fe5d2f4a JB |
120 | unsigned n = 1, f = 1; |
121 | ||
122 | if (!strcmp("near", format)) | |
123 | n = copies; | |
124 | else | |
125 | f = copies; | |
126 | ||
127 | if (!strcmp("offset", format)) | |
128 | return 0x30000 | (f << 8) | n; | |
129 | ||
130 | if (!strcmp("far", format)) | |
131 | return 0x20000 | (f << 8) | n; | |
132 | ||
133 | return (f << 8) | n; | |
63f33b8d JB |
134 | } |
135 | ||
9d09e663 N |
136 | static struct raid_type *get_raid_type(char *name) |
137 | { | |
138 | int i; | |
139 | ||
140 | for (i = 0; i < ARRAY_SIZE(raid_types); i++) | |
141 | if (!strcmp(raid_types[i].name, name)) | |
142 | return &raid_types[i]; | |
143 | ||
144 | return NULL; | |
145 | } | |
146 | ||
147 | static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs) | |
148 | { | |
149 | unsigned i; | |
150 | struct raid_set *rs; | |
9d09e663 N |
151 | |
152 | if (raid_devs <= raid_type->parity_devs) { | |
153 | ti->error = "Insufficient number of devices"; | |
154 | return ERR_PTR(-EINVAL); | |
155 | } | |
156 | ||
9d09e663 N |
157 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); |
158 | if (!rs) { | |
159 | ti->error = "Cannot allocate raid context"; | |
160 | return ERR_PTR(-ENOMEM); | |
161 | } | |
162 | ||
163 | mddev_init(&rs->md); | |
164 | ||
165 | rs->ti = ti; | |
166 | rs->raid_type = raid_type; | |
167 | rs->md.raid_disks = raid_devs; | |
168 | rs->md.level = raid_type->level; | |
169 | rs->md.new_level = rs->md.level; | |
9d09e663 N |
170 | rs->md.layout = raid_type->algorithm; |
171 | rs->md.new_layout = rs->md.layout; | |
172 | rs->md.delta_disks = 0; | |
173 | rs->md.recovery_cp = 0; | |
174 | ||
175 | for (i = 0; i < raid_devs; i++) | |
176 | md_rdev_init(&rs->dev[i].rdev); | |
177 | ||
178 | /* | |
179 | * Remaining items to be initialized by further RAID params: | |
180 | * rs->md.persistent | |
181 | * rs->md.external | |
182 | * rs->md.chunk_sectors | |
183 | * rs->md.new_chunk_sectors | |
c039c332 | 184 | * rs->md.dev_sectors |
9d09e663 N |
185 | */ |
186 | ||
187 | return rs; | |
188 | } | |
189 | ||
190 | static void context_free(struct raid_set *rs) | |
191 | { | |
192 | int i; | |
193 | ||
b12d437b JB |
194 | for (i = 0; i < rs->md.raid_disks; i++) { |
195 | if (rs->dev[i].meta_dev) | |
196 | dm_put_device(rs->ti, rs->dev[i].meta_dev); | |
545c8795 | 197 | md_rdev_clear(&rs->dev[i].rdev); |
9d09e663 N |
198 | if (rs->dev[i].data_dev) |
199 | dm_put_device(rs->ti, rs->dev[i].data_dev); | |
b12d437b | 200 | } |
9d09e663 N |
201 | |
202 | kfree(rs); | |
203 | } | |
204 | ||
205 | /* | |
206 | * For every device we have two words | |
207 | * <meta_dev>: meta device name or '-' if missing | |
208 | * <data_dev>: data device name or '-' if missing | |
209 | * | |
b12d437b JB |
210 | * The following are permitted: |
211 | * - - | |
212 | * - <data_dev> | |
213 | * <meta_dev> <data_dev> | |
214 | * | |
215 | * The following is not allowed: | |
216 | * <meta_dev> - | |
217 | * | |
218 | * This code parses those words. If there is a failure, | |
219 | * the caller must use context_free to unwind the operations. | |
9d09e663 N |
220 | */ |
221 | static int dev_parms(struct raid_set *rs, char **argv) | |
222 | { | |
223 | int i; | |
224 | int rebuild = 0; | |
225 | int metadata_available = 0; | |
226 | int ret = 0; | |
227 | ||
228 | for (i = 0; i < rs->md.raid_disks; i++, argv += 2) { | |
229 | rs->dev[i].rdev.raid_disk = i; | |
230 | ||
231 | rs->dev[i].meta_dev = NULL; | |
232 | rs->dev[i].data_dev = NULL; | |
233 | ||
234 | /* | |
235 | * There are no offsets, since there is a separate device | |
236 | * for data and metadata. | |
237 | */ | |
238 | rs->dev[i].rdev.data_offset = 0; | |
239 | rs->dev[i].rdev.mddev = &rs->md; | |
240 | ||
241 | if (strcmp(argv[0], "-")) { | |
b12d437b JB |
242 | ret = dm_get_device(rs->ti, argv[0], |
243 | dm_table_get_mode(rs->ti->table), | |
244 | &rs->dev[i].meta_dev); | |
245 | rs->ti->error = "RAID metadata device lookup failure"; | |
246 | if (ret) | |
247 | return ret; | |
248 | ||
249 | rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); | |
250 | if (!rs->dev[i].rdev.sb_page) | |
251 | return -ENOMEM; | |
9d09e663 N |
252 | } |
253 | ||
254 | if (!strcmp(argv[1], "-")) { | |
255 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && | |
256 | (!rs->dev[i].rdev.recovery_offset)) { | |
257 | rs->ti->error = "Drive designated for rebuild not specified"; | |
258 | return -EINVAL; | |
259 | } | |
260 | ||
b12d437b JB |
261 | rs->ti->error = "No data device supplied with metadata device"; |
262 | if (rs->dev[i].meta_dev) | |
263 | return -EINVAL; | |
264 | ||
9d09e663 N |
265 | continue; |
266 | } | |
267 | ||
268 | ret = dm_get_device(rs->ti, argv[1], | |
269 | dm_table_get_mode(rs->ti->table), | |
270 | &rs->dev[i].data_dev); | |
271 | if (ret) { | |
272 | rs->ti->error = "RAID device lookup failure"; | |
273 | return ret; | |
274 | } | |
275 | ||
b12d437b JB |
276 | if (rs->dev[i].meta_dev) { |
277 | metadata_available = 1; | |
278 | rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; | |
279 | } | |
9d09e663 N |
280 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
281 | list_add(&rs->dev[i].rdev.same_set, &rs->md.disks); | |
282 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
283 | rebuild++; | |
284 | } | |
285 | ||
286 | if (metadata_available) { | |
287 | rs->md.external = 0; | |
288 | rs->md.persistent = 1; | |
289 | rs->md.major_version = 2; | |
290 | } else if (rebuild && !rs->md.recovery_cp) { | |
291 | /* | |
292 | * Without metadata, we will not be able to tell if the array | |
293 | * is in-sync or not - we must assume it is not. Therefore, | |
294 | * it is impossible to rebuild a drive. | |
295 | * | |
296 | * Even if there is metadata, the on-disk information may | |
297 | * indicate that the array is not in-sync and it will then | |
298 | * fail at that time. | |
299 | * | |
300 | * User could specify 'nosync' option if desperate. | |
301 | */ | |
302 | DMERR("Unable to rebuild drive while array is not in-sync"); | |
303 | rs->ti->error = "RAID device lookup failure"; | |
304 | return -EINVAL; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
c1084561 JB |
310 | /* |
311 | * validate_region_size | |
312 | * @rs | |
313 | * @region_size: region size in sectors. If 0, pick a size (4MiB default). | |
314 | * | |
315 | * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). | |
316 | * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. | |
317 | * | |
318 | * Returns: 0 on success, -EINVAL on failure. | |
319 | */ | |
320 | static int validate_region_size(struct raid_set *rs, unsigned long region_size) | |
321 | { | |
322 | unsigned long min_region_size = rs->ti->len / (1 << 21); | |
323 | ||
324 | if (!region_size) { | |
325 | /* | |
326 | * Choose a reasonable default. All figures in sectors. | |
327 | */ | |
328 | if (min_region_size > (1 << 13)) { | |
3a0f9aae JB |
329 | /* If not a power of 2, make it the next power of 2 */ |
330 | if (min_region_size & (min_region_size - 1)) | |
331 | region_size = 1 << fls(region_size); | |
c1084561 JB |
332 | DMINFO("Choosing default region size of %lu sectors", |
333 | region_size); | |
c1084561 JB |
334 | } else { |
335 | DMINFO("Choosing default region size of 4MiB"); | |
336 | region_size = 1 << 13; /* sectors */ | |
337 | } | |
338 | } else { | |
339 | /* | |
340 | * Validate user-supplied value. | |
341 | */ | |
342 | if (region_size > rs->ti->len) { | |
343 | rs->ti->error = "Supplied region size is too large"; | |
344 | return -EINVAL; | |
345 | } | |
346 | ||
347 | if (region_size < min_region_size) { | |
348 | DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", | |
349 | region_size, min_region_size); | |
350 | rs->ti->error = "Supplied region size is too small"; | |
351 | return -EINVAL; | |
352 | } | |
353 | ||
354 | if (!is_power_of_2(region_size)) { | |
355 | rs->ti->error = "Region size is not a power of 2"; | |
356 | return -EINVAL; | |
357 | } | |
358 | ||
359 | if (region_size < rs->md.chunk_sectors) { | |
360 | rs->ti->error = "Region size is smaller than the chunk size"; | |
361 | return -EINVAL; | |
362 | } | |
363 | } | |
364 | ||
365 | /* | |
366 | * Convert sectors to bytes. | |
367 | */ | |
368 | rs->md.bitmap_info.chunksize = (region_size << 9); | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
eb649123 | 373 | /* |
55ebbb59 | 374 | * validate_raid_redundancy |
eb649123 JB |
375 | * @rs |
376 | * | |
55ebbb59 JB |
377 | * Determine if there are enough devices in the array that haven't |
378 | * failed (or are being rebuilt) to form a usable array. | |
eb649123 JB |
379 | * |
380 | * Returns: 0 on success, -EINVAL on failure. | |
381 | */ | |
55ebbb59 | 382 | static int validate_raid_redundancy(struct raid_set *rs) |
eb649123 JB |
383 | { |
384 | unsigned i, rebuild_cnt = 0; | |
3f6bbd3f | 385 | unsigned rebuilds_per_group = 0, copies, d; |
fe5d2f4a | 386 | unsigned group_size, last_group_start; |
eb649123 | 387 | |
eb649123 | 388 | for (i = 0; i < rs->md.raid_disks; i++) |
55ebbb59 JB |
389 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || |
390 | !rs->dev[i].rdev.sb_page) | |
eb649123 JB |
391 | rebuild_cnt++; |
392 | ||
393 | switch (rs->raid_type->level) { | |
394 | case 1: | |
395 | if (rebuild_cnt >= rs->md.raid_disks) | |
396 | goto too_many; | |
397 | break; | |
398 | case 4: | |
399 | case 5: | |
400 | case 6: | |
401 | if (rebuild_cnt > rs->raid_type->parity_devs) | |
402 | goto too_many; | |
403 | break; | |
404 | case 10: | |
4ec1e369 JB |
405 | copies = raid10_md_layout_to_copies(rs->md.layout); |
406 | if (rebuild_cnt < copies) | |
407 | break; | |
408 | ||
409 | /* | |
410 | * It is possible to have a higher rebuild count for RAID10, | |
411 | * as long as the failed devices occur in different mirror | |
412 | * groups (i.e. different stripes). | |
413 | * | |
4ec1e369 JB |
414 | * When checking "near" format, make sure no adjacent devices |
415 | * have failed beyond what can be handled. In addition to the | |
416 | * simple case where the number of devices is a multiple of the | |
417 | * number of copies, we must also handle cases where the number | |
418 | * of devices is not a multiple of the number of copies. | |
419 | * E.g. dev1 dev2 dev3 dev4 dev5 | |
420 | * A A B B C | |
421 | * C D D E E | |
422 | */ | |
fe5d2f4a JB |
423 | if (!strcmp("near", raid10_md_layout_to_format(rs->md.layout))) { |
424 | for (i = 0; i < rs->md.raid_disks * copies; i++) { | |
425 | if (!(i % copies)) | |
426 | rebuilds_per_group = 0; | |
427 | d = i % rs->md.raid_disks; | |
428 | if ((!rs->dev[d].rdev.sb_page || | |
429 | !test_bit(In_sync, &rs->dev[d].rdev.flags)) && | |
430 | (++rebuilds_per_group >= copies)) | |
431 | goto too_many; | |
432 | } | |
433 | break; | |
434 | } | |
435 | ||
436 | /* | |
437 | * When checking "far" and "offset" formats, we need to ensure | |
438 | * that the device that holds its copy is not also dead or | |
439 | * being rebuilt. (Note that "far" and "offset" formats only | |
440 | * support two copies right now. These formats also only ever | |
441 | * use the 'use_far_sets' variant.) | |
442 | * | |
443 | * This check is somewhat complicated by the need to account | |
444 | * for arrays that are not a multiple of (far) copies. This | |
445 | * results in the need to treat the last (potentially larger) | |
446 | * set differently. | |
447 | */ | |
448 | group_size = (rs->md.raid_disks / copies); | |
449 | last_group_start = (rs->md.raid_disks / group_size) - 1; | |
450 | last_group_start *= group_size; | |
451 | for (i = 0; i < rs->md.raid_disks; i++) { | |
452 | if (!(i % copies) && !(i > last_group_start)) | |
55ebbb59 | 453 | rebuilds_per_group = 0; |
fe5d2f4a JB |
454 | if ((!rs->dev[i].rdev.sb_page || |
455 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) && | |
4ec1e369 | 456 | (++rebuilds_per_group >= copies)) |
fe5d2f4a | 457 | goto too_many; |
4ec1e369 JB |
458 | } |
459 | break; | |
eb649123 | 460 | default: |
55ebbb59 JB |
461 | if (rebuild_cnt) |
462 | return -EINVAL; | |
eb649123 JB |
463 | } |
464 | ||
465 | return 0; | |
466 | ||
467 | too_many: | |
eb649123 JB |
468 | return -EINVAL; |
469 | } | |
470 | ||
9d09e663 N |
471 | /* |
472 | * Possible arguments are... | |
9d09e663 N |
473 | * <chunk_size> [optional_args] |
474 | * | |
32737279 JB |
475 | * Argument definitions |
476 | * <chunk_size> The number of sectors per disk that | |
477 | * will form the "stripe" | |
478 | * [[no]sync] Force or prevent recovery of the | |
479 | * entire array | |
9d09e663 | 480 | * [rebuild <idx>] Rebuild the drive indicated by the index |
32737279 JB |
481 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
482 | * clear bits | |
9d09e663 N |
483 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
484 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization | |
46bed2b5 | 485 | * [write_mostly <idx>] Indicate a write mostly drive via index |
9d09e663 N |
486 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
487 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs | |
c1084561 | 488 | * [region_size <sectors>] Defines granularity of bitmap |
63f33b8d JB |
489 | * |
490 | * RAID10-only options: | |
491 | * [raid10_copies <# copies>] Number of copies. (Default: 2) | |
fe5d2f4a | 492 | * [raid10_format <near|far|offset>] Layout algorithm. (Default: near) |
9d09e663 N |
493 | */ |
494 | static int parse_raid_params(struct raid_set *rs, char **argv, | |
495 | unsigned num_raid_params) | |
496 | { | |
63f33b8d JB |
497 | char *raid10_format = "near"; |
498 | unsigned raid10_copies = 2; | |
eb649123 | 499 | unsigned i; |
c1084561 | 500 | unsigned long value, region_size = 0; |
c039c332 | 501 | sector_t sectors_per_dev = rs->ti->len; |
542f9038 | 502 | sector_t max_io_len; |
9d09e663 N |
503 | char *key; |
504 | ||
505 | /* | |
506 | * First, parse the in-order required arguments | |
32737279 | 507 | * "chunk_size" is the only argument of this type. |
9d09e663 | 508 | */ |
b29bebd6 | 509 | if ((kstrtoul(argv[0], 10, &value) < 0)) { |
9d09e663 N |
510 | rs->ti->error = "Bad chunk size"; |
511 | return -EINVAL; | |
32737279 JB |
512 | } else if (rs->raid_type->level == 1) { |
513 | if (value) | |
514 | DMERR("Ignoring chunk size parameter for RAID 1"); | |
515 | value = 0; | |
516 | } else if (!is_power_of_2(value)) { | |
517 | rs->ti->error = "Chunk size must be a power of 2"; | |
518 | return -EINVAL; | |
519 | } else if (value < 8) { | |
520 | rs->ti->error = "Chunk size value is too small"; | |
521 | return -EINVAL; | |
9d09e663 N |
522 | } |
523 | ||
524 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; | |
525 | argv++; | |
526 | num_raid_params--; | |
527 | ||
528 | /* | |
b12d437b JB |
529 | * We set each individual device as In_sync with a completed |
530 | * 'recovery_offset'. If there has been a device failure or | |
531 | * replacement then one of the following cases applies: | |
532 | * | |
533 | * 1) User specifies 'rebuild'. | |
534 | * - Device is reset when param is read. | |
535 | * 2) A new device is supplied. | |
536 | * - No matching superblock found, resets device. | |
537 | * 3) Device failure was transient and returns on reload. | |
538 | * - Failure noticed, resets device for bitmap replay. | |
539 | * 4) Device hadn't completed recovery after previous failure. | |
540 | * - Superblock is read and overrides recovery_offset. | |
541 | * | |
542 | * What is found in the superblocks of the devices is always | |
543 | * authoritative, unless 'rebuild' or '[no]sync' was specified. | |
9d09e663 | 544 | */ |
b12d437b | 545 | for (i = 0; i < rs->md.raid_disks; i++) { |
9d09e663 | 546 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
b12d437b JB |
547 | rs->dev[i].rdev.recovery_offset = MaxSector; |
548 | } | |
9d09e663 | 549 | |
b12d437b JB |
550 | /* |
551 | * Second, parse the unordered optional arguments | |
552 | */ | |
9d09e663 | 553 | for (i = 0; i < num_raid_params; i++) { |
13c87583 | 554 | if (!strcasecmp(argv[i], "nosync")) { |
9d09e663 N |
555 | rs->md.recovery_cp = MaxSector; |
556 | rs->print_flags |= DMPF_NOSYNC; | |
9d09e663 N |
557 | continue; |
558 | } | |
13c87583 | 559 | if (!strcasecmp(argv[i], "sync")) { |
9d09e663 N |
560 | rs->md.recovery_cp = 0; |
561 | rs->print_flags |= DMPF_SYNC; | |
9d09e663 N |
562 | continue; |
563 | } | |
564 | ||
565 | /* The rest of the optional arguments come in key/value pairs */ | |
566 | if ((i + 1) >= num_raid_params) { | |
567 | rs->ti->error = "Wrong number of raid parameters given"; | |
568 | return -EINVAL; | |
569 | } | |
570 | ||
571 | key = argv[i++]; | |
63f33b8d JB |
572 | |
573 | /* Parameters that take a string value are checked here. */ | |
574 | if (!strcasecmp(key, "raid10_format")) { | |
575 | if (rs->raid_type->level != 10) { | |
576 | rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type"; | |
577 | return -EINVAL; | |
578 | } | |
fe5d2f4a JB |
579 | if (strcmp("near", argv[i]) && |
580 | strcmp("far", argv[i]) && | |
581 | strcmp("offset", argv[i])) { | |
63f33b8d JB |
582 | rs->ti->error = "Invalid 'raid10_format' value given"; |
583 | return -EINVAL; | |
584 | } | |
585 | raid10_format = argv[i]; | |
586 | rs->print_flags |= DMPF_RAID10_FORMAT; | |
587 | continue; | |
588 | } | |
589 | ||
b29bebd6 | 590 | if (kstrtoul(argv[i], 10, &value) < 0) { |
9d09e663 N |
591 | rs->ti->error = "Bad numerical argument given in raid params"; |
592 | return -EINVAL; | |
593 | } | |
594 | ||
63f33b8d | 595 | /* Parameters that take a numeric value are checked here */ |
13c87583 | 596 | if (!strcasecmp(key, "rebuild")) { |
7386199c | 597 | if (value >= rs->md.raid_disks) { |
9d09e663 N |
598 | rs->ti->error = "Invalid rebuild index given"; |
599 | return -EINVAL; | |
600 | } | |
601 | clear_bit(In_sync, &rs->dev[value].rdev.flags); | |
602 | rs->dev[value].rdev.recovery_offset = 0; | |
13c87583 | 603 | rs->print_flags |= DMPF_REBUILD; |
46bed2b5 JB |
604 | } else if (!strcasecmp(key, "write_mostly")) { |
605 | if (rs->raid_type->level != 1) { | |
606 | rs->ti->error = "write_mostly option is only valid for RAID1"; | |
607 | return -EINVAL; | |
608 | } | |
82324809 | 609 | if (value >= rs->md.raid_disks) { |
46bed2b5 JB |
610 | rs->ti->error = "Invalid write_mostly drive index given"; |
611 | return -EINVAL; | |
612 | } | |
613 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); | |
13c87583 | 614 | } else if (!strcasecmp(key, "max_write_behind")) { |
46bed2b5 JB |
615 | if (rs->raid_type->level != 1) { |
616 | rs->ti->error = "max_write_behind option is only valid for RAID1"; | |
617 | return -EINVAL; | |
618 | } | |
9d09e663 N |
619 | rs->print_flags |= DMPF_MAX_WRITE_BEHIND; |
620 | ||
621 | /* | |
622 | * In device-mapper, we specify things in sectors, but | |
623 | * MD records this value in kB | |
624 | */ | |
625 | value /= 2; | |
626 | if (value > COUNTER_MAX) { | |
627 | rs->ti->error = "Max write-behind limit out of range"; | |
628 | return -EINVAL; | |
629 | } | |
630 | rs->md.bitmap_info.max_write_behind = value; | |
13c87583 | 631 | } else if (!strcasecmp(key, "daemon_sleep")) { |
9d09e663 N |
632 | rs->print_flags |= DMPF_DAEMON_SLEEP; |
633 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) { | |
634 | rs->ti->error = "daemon sleep period out of range"; | |
635 | return -EINVAL; | |
636 | } | |
637 | rs->md.bitmap_info.daemon_sleep = value; | |
13c87583 | 638 | } else if (!strcasecmp(key, "stripe_cache")) { |
9d09e663 N |
639 | rs->print_flags |= DMPF_STRIPE_CACHE; |
640 | ||
641 | /* | |
642 | * In device-mapper, we specify things in sectors, but | |
643 | * MD records this value in kB | |
644 | */ | |
645 | value /= 2; | |
646 | ||
63f33b8d JB |
647 | if ((rs->raid_type->level != 5) && |
648 | (rs->raid_type->level != 6)) { | |
9d09e663 N |
649 | rs->ti->error = "Inappropriate argument: stripe_cache"; |
650 | return -EINVAL; | |
651 | } | |
652 | if (raid5_set_cache_size(&rs->md, (int)value)) { | |
653 | rs->ti->error = "Bad stripe_cache size"; | |
654 | return -EINVAL; | |
655 | } | |
13c87583 | 656 | } else if (!strcasecmp(key, "min_recovery_rate")) { |
9d09e663 N |
657 | rs->print_flags |= DMPF_MIN_RECOVERY_RATE; |
658 | if (value > INT_MAX) { | |
659 | rs->ti->error = "min_recovery_rate out of range"; | |
660 | return -EINVAL; | |
661 | } | |
662 | rs->md.sync_speed_min = (int)value; | |
13c87583 | 663 | } else if (!strcasecmp(key, "max_recovery_rate")) { |
9d09e663 N |
664 | rs->print_flags |= DMPF_MAX_RECOVERY_RATE; |
665 | if (value > INT_MAX) { | |
666 | rs->ti->error = "max_recovery_rate out of range"; | |
667 | return -EINVAL; | |
668 | } | |
669 | rs->md.sync_speed_max = (int)value; | |
c1084561 JB |
670 | } else if (!strcasecmp(key, "region_size")) { |
671 | rs->print_flags |= DMPF_REGION_SIZE; | |
672 | region_size = value; | |
63f33b8d JB |
673 | } else if (!strcasecmp(key, "raid10_copies") && |
674 | (rs->raid_type->level == 10)) { | |
675 | if ((value < 2) || (value > 0xFF)) { | |
676 | rs->ti->error = "Bad value for 'raid10_copies'"; | |
677 | return -EINVAL; | |
678 | } | |
679 | rs->print_flags |= DMPF_RAID10_COPIES; | |
680 | raid10_copies = value; | |
9d09e663 N |
681 | } else { |
682 | DMERR("Unable to parse RAID parameter: %s", key); | |
683 | rs->ti->error = "Unable to parse RAID parameters"; | |
684 | return -EINVAL; | |
685 | } | |
686 | } | |
687 | ||
c1084561 JB |
688 | if (validate_region_size(rs, region_size)) |
689 | return -EINVAL; | |
690 | ||
691 | if (rs->md.chunk_sectors) | |
542f9038 | 692 | max_io_len = rs->md.chunk_sectors; |
c1084561 | 693 | else |
542f9038 | 694 | max_io_len = region_size; |
c1084561 | 695 | |
542f9038 MS |
696 | if (dm_set_target_max_io_len(rs->ti, max_io_len)) |
697 | return -EINVAL; | |
32737279 | 698 | |
63f33b8d JB |
699 | if (rs->raid_type->level == 10) { |
700 | if (raid10_copies > rs->md.raid_disks) { | |
701 | rs->ti->error = "Not enough devices to satisfy specification"; | |
702 | return -EINVAL; | |
703 | } | |
704 | ||
fe5d2f4a JB |
705 | /* |
706 | * If the format is not "near", we only support | |
707 | * two copies at the moment. | |
708 | */ | |
709 | if (strcmp("near", raid10_format) && (raid10_copies > 2)) { | |
710 | rs->ti->error = "Too many copies for given RAID10 format."; | |
711 | return -EINVAL; | |
712 | } | |
713 | ||
63f33b8d JB |
714 | /* (Len * #mirrors) / #devices */ |
715 | sectors_per_dev = rs->ti->len * raid10_copies; | |
716 | sector_div(sectors_per_dev, rs->md.raid_disks); | |
717 | ||
718 | rs->md.layout = raid10_format_to_md_layout(raid10_format, | |
719 | raid10_copies); | |
720 | rs->md.new_layout = rs->md.layout; | |
721 | } else if ((rs->raid_type->level > 1) && | |
722 | sector_div(sectors_per_dev, | |
723 | (rs->md.raid_disks - rs->raid_type->parity_devs))) { | |
c039c332 JB |
724 | rs->ti->error = "Target length not divisible by number of data devices"; |
725 | return -EINVAL; | |
726 | } | |
727 | rs->md.dev_sectors = sectors_per_dev; | |
728 | ||
9d09e663 N |
729 | /* Assume there are no metadata devices until the drives are parsed */ |
730 | rs->md.persistent = 0; | |
731 | rs->md.external = 1; | |
732 | ||
733 | return 0; | |
734 | } | |
735 | ||
736 | static void do_table_event(struct work_struct *ws) | |
737 | { | |
738 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); | |
739 | ||
740 | dm_table_event(rs->ti->table); | |
741 | } | |
742 | ||
743 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) | |
744 | { | |
745 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); | |
746 | ||
5c675f83 | 747 | return mddev_congested(&rs->md, bits); |
9d09e663 N |
748 | } |
749 | ||
b12d437b JB |
750 | /* |
751 | * This structure is never routinely used by userspace, unlike md superblocks. | |
752 | * Devices with this superblock should only ever be accessed via device-mapper. | |
753 | */ | |
754 | #define DM_RAID_MAGIC 0x64526D44 | |
755 | struct dm_raid_superblock { | |
756 | __le32 magic; /* "DmRd" */ | |
757 | __le32 features; /* Used to indicate possible future changes */ | |
758 | ||
759 | __le32 num_devices; /* Number of devices in this array. (Max 64) */ | |
760 | __le32 array_position; /* The position of this drive in the array */ | |
761 | ||
762 | __le64 events; /* Incremented by md when superblock updated */ | |
763 | __le64 failed_devices; /* Bit field of devices to indicate failures */ | |
764 | ||
765 | /* | |
766 | * This offset tracks the progress of the repair or replacement of | |
767 | * an individual drive. | |
768 | */ | |
769 | __le64 disk_recovery_offset; | |
770 | ||
771 | /* | |
772 | * This offset tracks the progress of the initial array | |
773 | * synchronisation/parity calculation. | |
774 | */ | |
775 | __le64 array_resync_offset; | |
776 | ||
777 | /* | |
778 | * RAID characteristics | |
779 | */ | |
780 | __le32 level; | |
781 | __le32 layout; | |
782 | __le32 stripe_sectors; | |
783 | ||
40d43c4b | 784 | /* Remainder of a logical block is zero-filled when writing (see super_sync()). */ |
b12d437b JB |
785 | } __packed; |
786 | ||
3cb03002 | 787 | static int read_disk_sb(struct md_rdev *rdev, int size) |
b12d437b JB |
788 | { |
789 | BUG_ON(!rdev->sb_page); | |
790 | ||
791 | if (rdev->sb_loaded) | |
792 | return 0; | |
793 | ||
794 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) { | |
0447568f JB |
795 | DMERR("Failed to read superblock of device at position %d", |
796 | rdev->raid_disk); | |
c32fb9e7 | 797 | md_error(rdev->mddev, rdev); |
b12d437b JB |
798 | return -EINVAL; |
799 | } | |
800 | ||
801 | rdev->sb_loaded = 1; | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
fd01b88c | 806 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b | 807 | { |
81f382f9 | 808 | int i; |
b12d437b JB |
809 | uint64_t failed_devices; |
810 | struct dm_raid_superblock *sb; | |
81f382f9 | 811 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
b12d437b JB |
812 | |
813 | sb = page_address(rdev->sb_page); | |
814 | failed_devices = le64_to_cpu(sb->failed_devices); | |
815 | ||
81f382f9 JB |
816 | for (i = 0; i < mddev->raid_disks; i++) |
817 | if (!rs->dev[i].data_dev || | |
818 | test_bit(Faulty, &(rs->dev[i].rdev.flags))) | |
819 | failed_devices |= (1ULL << i); | |
b12d437b | 820 | |
40d43c4b | 821 | memset(sb + 1, 0, rdev->sb_size - sizeof(*sb)); |
b12d437b JB |
822 | |
823 | sb->magic = cpu_to_le32(DM_RAID_MAGIC); | |
824 | sb->features = cpu_to_le32(0); /* No features yet */ | |
825 | ||
826 | sb->num_devices = cpu_to_le32(mddev->raid_disks); | |
827 | sb->array_position = cpu_to_le32(rdev->raid_disk); | |
828 | ||
829 | sb->events = cpu_to_le64(mddev->events); | |
830 | sb->failed_devices = cpu_to_le64(failed_devices); | |
831 | ||
832 | sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
833 | sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); | |
834 | ||
835 | sb->level = cpu_to_le32(mddev->level); | |
836 | sb->layout = cpu_to_le32(mddev->layout); | |
837 | sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); | |
838 | } | |
839 | ||
840 | /* | |
841 | * super_load | |
842 | * | |
843 | * This function creates a superblock if one is not found on the device | |
844 | * and will decide which superblock to use if there's a choice. | |
845 | * | |
846 | * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise | |
847 | */ | |
3cb03002 | 848 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
b12d437b JB |
849 | { |
850 | int ret; | |
851 | struct dm_raid_superblock *sb; | |
852 | struct dm_raid_superblock *refsb; | |
853 | uint64_t events_sb, events_refsb; | |
854 | ||
855 | rdev->sb_start = 0; | |
40d43c4b HM |
856 | rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev); |
857 | if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) { | |
858 | DMERR("superblock size of a logical block is no longer valid"); | |
859 | return -EINVAL; | |
860 | } | |
b12d437b JB |
861 | |
862 | ret = read_disk_sb(rdev, rdev->sb_size); | |
863 | if (ret) | |
864 | return ret; | |
865 | ||
866 | sb = page_address(rdev->sb_page); | |
3aa3b2b2 JB |
867 | |
868 | /* | |
869 | * Two cases that we want to write new superblocks and rebuild: | |
870 | * 1) New device (no matching magic number) | |
871 | * 2) Device specified for rebuild (!In_sync w/ offset == 0) | |
872 | */ | |
873 | if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) || | |
874 | (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) { | |
b12d437b JB |
875 | super_sync(rdev->mddev, rdev); |
876 | ||
877 | set_bit(FirstUse, &rdev->flags); | |
878 | ||
879 | /* Force writing of superblocks to disk */ | |
880 | set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags); | |
881 | ||
882 | /* Any superblock is better than none, choose that if given */ | |
883 | return refdev ? 0 : 1; | |
884 | } | |
885 | ||
886 | if (!refdev) | |
887 | return 1; | |
888 | ||
889 | events_sb = le64_to_cpu(sb->events); | |
890 | ||
891 | refsb = page_address(refdev->sb_page); | |
892 | events_refsb = le64_to_cpu(refsb->events); | |
893 | ||
894 | return (events_sb > events_refsb) ? 1 : 0; | |
895 | } | |
896 | ||
fd01b88c | 897 | static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
898 | { |
899 | int role; | |
900 | struct raid_set *rs = container_of(mddev, struct raid_set, md); | |
901 | uint64_t events_sb; | |
902 | uint64_t failed_devices; | |
903 | struct dm_raid_superblock *sb; | |
904 | uint32_t new_devs = 0; | |
905 | uint32_t rebuilds = 0; | |
dafb20fa | 906 | struct md_rdev *r; |
b12d437b JB |
907 | struct dm_raid_superblock *sb2; |
908 | ||
909 | sb = page_address(rdev->sb_page); | |
910 | events_sb = le64_to_cpu(sb->events); | |
911 | failed_devices = le64_to_cpu(sb->failed_devices); | |
912 | ||
913 | /* | |
914 | * Initialise to 1 if this is a new superblock. | |
915 | */ | |
916 | mddev->events = events_sb ? : 1; | |
917 | ||
918 | /* | |
919 | * Reshaping is not currently allowed | |
920 | */ | |
fe5d2f4a JB |
921 | if (le32_to_cpu(sb->level) != mddev->level) { |
922 | DMERR("Reshaping arrays not yet supported. (RAID level change)"); | |
923 | return -EINVAL; | |
924 | } | |
925 | if (le32_to_cpu(sb->layout) != mddev->layout) { | |
926 | DMERR("Reshaping arrays not yet supported. (RAID layout change)"); | |
927 | DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout); | |
928 | DMERR(" Old layout: %s w/ %d copies", | |
929 | raid10_md_layout_to_format(le32_to_cpu(sb->layout)), | |
930 | raid10_md_layout_to_copies(le32_to_cpu(sb->layout))); | |
931 | DMERR(" New layout: %s w/ %d copies", | |
932 | raid10_md_layout_to_format(mddev->layout), | |
933 | raid10_md_layout_to_copies(mddev->layout)); | |
934 | return -EINVAL; | |
935 | } | |
936 | if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) { | |
937 | DMERR("Reshaping arrays not yet supported. (stripe sectors change)"); | |
b12d437b JB |
938 | return -EINVAL; |
939 | } | |
940 | ||
941 | /* We can only change the number of devices in RAID1 right now */ | |
942 | if ((rs->raid_type->level != 1) && | |
943 | (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) { | |
fe5d2f4a | 944 | DMERR("Reshaping arrays not yet supported. (device count change)"); |
b12d437b JB |
945 | return -EINVAL; |
946 | } | |
947 | ||
948 | if (!(rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))) | |
949 | mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); | |
950 | ||
951 | /* | |
952 | * During load, we set FirstUse if a new superblock was written. | |
953 | * There are two reasons we might not have a superblock: | |
954 | * 1) The array is brand new - in which case, all of the | |
955 | * devices must have their In_sync bit set. Also, | |
956 | * recovery_cp must be 0, unless forced. | |
957 | * 2) This is a new device being added to an old array | |
958 | * and the new device needs to be rebuilt - in which | |
959 | * case the In_sync bit will /not/ be set and | |
960 | * recovery_cp must be MaxSector. | |
961 | */ | |
dafb20fa | 962 | rdev_for_each(r, mddev) { |
b12d437b | 963 | if (!test_bit(In_sync, &r->flags)) { |
3aa3b2b2 JB |
964 | DMINFO("Device %d specified for rebuild: " |
965 | "Clearing superblock", r->raid_disk); | |
b12d437b JB |
966 | rebuilds++; |
967 | } else if (test_bit(FirstUse, &r->flags)) | |
968 | new_devs++; | |
969 | } | |
970 | ||
971 | if (!rebuilds) { | |
972 | if (new_devs == mddev->raid_disks) { | |
973 | DMINFO("Superblocks created for new array"); | |
974 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); | |
975 | } else if (new_devs) { | |
976 | DMERR("New device injected " | |
977 | "into existing array without 'rebuild' " | |
978 | "parameter specified"); | |
979 | return -EINVAL; | |
980 | } | |
981 | } else if (new_devs) { | |
982 | DMERR("'rebuild' devices cannot be " | |
983 | "injected into an array with other first-time devices"); | |
984 | return -EINVAL; | |
985 | } else if (mddev->recovery_cp != MaxSector) { | |
986 | DMERR("'rebuild' specified while array is not in-sync"); | |
987 | return -EINVAL; | |
988 | } | |
989 | ||
990 | /* | |
991 | * Now we set the Faulty bit for those devices that are | |
992 | * recorded in the superblock as failed. | |
993 | */ | |
dafb20fa | 994 | rdev_for_each(r, mddev) { |
b12d437b JB |
995 | if (!r->sb_page) |
996 | continue; | |
997 | sb2 = page_address(r->sb_page); | |
998 | sb2->failed_devices = 0; | |
999 | ||
1000 | /* | |
1001 | * Check for any device re-ordering. | |
1002 | */ | |
1003 | if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) { | |
1004 | role = le32_to_cpu(sb2->array_position); | |
1005 | if (role != r->raid_disk) { | |
1006 | if (rs->raid_type->level != 1) { | |
1007 | rs->ti->error = "Cannot change device " | |
1008 | "positions in RAID array"; | |
1009 | return -EINVAL; | |
1010 | } | |
1011 | DMINFO("RAID1 device #%d now at position #%d", | |
1012 | role, r->raid_disk); | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * Partial recovery is performed on | |
1017 | * returning failed devices. | |
1018 | */ | |
1019 | if (failed_devices & (1 << role)) | |
1020 | set_bit(Faulty, &r->flags); | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | return 0; | |
1025 | } | |
1026 | ||
fd01b88c | 1027 | static int super_validate(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
1028 | { |
1029 | struct dm_raid_superblock *sb = page_address(rdev->sb_page); | |
1030 | ||
1031 | /* | |
1032 | * If mddev->events is not set, we know we have not yet initialized | |
1033 | * the array. | |
1034 | */ | |
1035 | if (!mddev->events && super_init_validation(mddev, rdev)) | |
1036 | return -EINVAL; | |
1037 | ||
1038 | mddev->bitmap_info.offset = 4096 >> 9; /* Enable bitmap creation */ | |
1039 | rdev->mddev->bitmap_info.default_offset = 4096 >> 9; | |
1040 | if (!test_bit(FirstUse, &rdev->flags)) { | |
1041 | rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); | |
1042 | if (rdev->recovery_offset != MaxSector) | |
1043 | clear_bit(In_sync, &rdev->flags); | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * If a device comes back, set it as not In_sync and no longer faulty. | |
1048 | */ | |
1049 | if (test_bit(Faulty, &rdev->flags)) { | |
1050 | clear_bit(Faulty, &rdev->flags); | |
1051 | clear_bit(In_sync, &rdev->flags); | |
1052 | rdev->saved_raid_disk = rdev->raid_disk; | |
1053 | rdev->recovery_offset = 0; | |
1054 | } | |
1055 | ||
1056 | clear_bit(FirstUse, &rdev->flags); | |
1057 | ||
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * Analyse superblocks and select the freshest. | |
1063 | */ | |
1064 | static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) | |
1065 | { | |
1066 | int ret; | |
0447568f | 1067 | struct raid_dev *dev; |
a9ad8526 | 1068 | struct md_rdev *rdev, *tmp, *freshest; |
fd01b88c | 1069 | struct mddev *mddev = &rs->md; |
b12d437b JB |
1070 | |
1071 | freshest = NULL; | |
a9ad8526 | 1072 | rdev_for_each_safe(rdev, tmp, mddev) { |
761becff JB |
1073 | /* |
1074 | * Skipping super_load due to DMPF_SYNC will cause | |
1075 | * the array to undergo initialization again as | |
1076 | * though it were new. This is the intended effect | |
1077 | * of the "sync" directive. | |
1078 | * | |
1079 | * When reshaping capability is added, we must ensure | |
1080 | * that the "sync" directive is disallowed during the | |
1081 | * reshape. | |
1082 | */ | |
1083 | if (rs->print_flags & DMPF_SYNC) | |
1084 | continue; | |
1085 | ||
b12d437b JB |
1086 | if (!rdev->meta_bdev) |
1087 | continue; | |
1088 | ||
1089 | ret = super_load(rdev, freshest); | |
1090 | ||
1091 | switch (ret) { | |
1092 | case 1: | |
1093 | freshest = rdev; | |
1094 | break; | |
1095 | case 0: | |
1096 | break; | |
1097 | default: | |
0447568f | 1098 | dev = container_of(rdev, struct raid_dev, rdev); |
55ebbb59 JB |
1099 | if (dev->meta_dev) |
1100 | dm_put_device(ti, dev->meta_dev); | |
0447568f | 1101 | |
55ebbb59 JB |
1102 | dev->meta_dev = NULL; |
1103 | rdev->meta_bdev = NULL; | |
0447568f | 1104 | |
55ebbb59 JB |
1105 | if (rdev->sb_page) |
1106 | put_page(rdev->sb_page); | |
0447568f | 1107 | |
55ebbb59 | 1108 | rdev->sb_page = NULL; |
0447568f | 1109 | |
55ebbb59 | 1110 | rdev->sb_loaded = 0; |
0447568f | 1111 | |
55ebbb59 JB |
1112 | /* |
1113 | * We might be able to salvage the data device | |
1114 | * even though the meta device has failed. For | |
1115 | * now, we behave as though '- -' had been | |
1116 | * set for this device in the table. | |
1117 | */ | |
1118 | if (dev->data_dev) | |
1119 | dm_put_device(ti, dev->data_dev); | |
0447568f | 1120 | |
55ebbb59 JB |
1121 | dev->data_dev = NULL; |
1122 | rdev->bdev = NULL; | |
0447568f | 1123 | |
55ebbb59 | 1124 | list_del(&rdev->same_set); |
b12d437b JB |
1125 | } |
1126 | } | |
1127 | ||
1128 | if (!freshest) | |
1129 | return 0; | |
1130 | ||
55ebbb59 JB |
1131 | if (validate_raid_redundancy(rs)) { |
1132 | rs->ti->error = "Insufficient redundancy to activate array"; | |
1133 | return -EINVAL; | |
1134 | } | |
1135 | ||
b12d437b JB |
1136 | /* |
1137 | * Validation of the freshest device provides the source of | |
1138 | * validation for the remaining devices. | |
1139 | */ | |
1140 | ti->error = "Unable to assemble array: Invalid superblocks"; | |
1141 | if (super_validate(mddev, freshest)) | |
1142 | return -EINVAL; | |
1143 | ||
dafb20fa | 1144 | rdev_for_each(rdev, mddev) |
b12d437b JB |
1145 | if ((rdev != freshest) && super_validate(mddev, rdev)) |
1146 | return -EINVAL; | |
1147 | ||
1148 | return 0; | |
1149 | } | |
1150 | ||
75b8e04b | 1151 | /* |
48cf06bc HM |
1152 | * Enable/disable discard support on RAID set depending on |
1153 | * RAID level and discard properties of underlying RAID members. | |
75b8e04b HM |
1154 | */ |
1155 | static void configure_discard_support(struct dm_target *ti, struct raid_set *rs) | |
1156 | { | |
48cf06bc HM |
1157 | int i; |
1158 | bool raid456; | |
1159 | ||
75b8e04b HM |
1160 | /* Assume discards not supported until after checks below. */ |
1161 | ti->discards_supported = false; | |
1162 | ||
1163 | /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */ | |
48cf06bc | 1164 | raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6); |
75b8e04b | 1165 | |
48cf06bc | 1166 | for (i = 0; i < rs->md.raid_disks; i++) { |
d20c4b08 | 1167 | struct request_queue *q; |
48cf06bc | 1168 | |
d20c4b08 HM |
1169 | if (!rs->dev[i].rdev.bdev) |
1170 | continue; | |
1171 | ||
1172 | q = bdev_get_queue(rs->dev[i].rdev.bdev); | |
48cf06bc HM |
1173 | if (!q || !blk_queue_discard(q)) |
1174 | return; | |
1175 | ||
1176 | if (raid456) { | |
1177 | if (!q->limits.discard_zeroes_data) | |
1178 | return; | |
1179 | if (!devices_handle_discard_safely) { | |
1180 | DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty."); | |
1181 | DMERR("Set dm-raid.devices_handle_discard_safely=Y to override."); | |
1182 | return; | |
1183 | } | |
1184 | } | |
1185 | } | |
1186 | ||
1187 | /* All RAID members properly support discards */ | |
75b8e04b HM |
1188 | ti->discards_supported = true; |
1189 | ||
1190 | /* | |
1191 | * RAID1 and RAID10 personalities require bio splitting, | |
48cf06bc | 1192 | * RAID0/4/5/6 don't and process large discard bios properly. |
75b8e04b | 1193 | */ |
48cf06bc | 1194 | ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10); |
75b8e04b HM |
1195 | ti->num_discard_bios = 1; |
1196 | } | |
1197 | ||
9d09e663 N |
1198 | /* |
1199 | * Construct a RAID4/5/6 mapping: | |
1200 | * Args: | |
1201 | * <raid_type> <#raid_params> <raid_params> \ | |
1202 | * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> } | |
1203 | * | |
9d09e663 N |
1204 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
1205 | * details on possible <raid_params>. | |
1206 | */ | |
1207 | static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) | |
1208 | { | |
1209 | int ret; | |
1210 | struct raid_type *rt; | |
1211 | unsigned long num_raid_params, num_raid_devs; | |
1212 | struct raid_set *rs = NULL; | |
1213 | ||
1214 | /* Must have at least <raid_type> <#raid_params> */ | |
1215 | if (argc < 2) { | |
1216 | ti->error = "Too few arguments"; | |
1217 | return -EINVAL; | |
1218 | } | |
1219 | ||
1220 | /* raid type */ | |
1221 | rt = get_raid_type(argv[0]); | |
1222 | if (!rt) { | |
1223 | ti->error = "Unrecognised raid_type"; | |
1224 | return -EINVAL; | |
1225 | } | |
1226 | argc--; | |
1227 | argv++; | |
1228 | ||
1229 | /* number of RAID parameters */ | |
b29bebd6 | 1230 | if (kstrtoul(argv[0], 10, &num_raid_params) < 0) { |
9d09e663 N |
1231 | ti->error = "Cannot understand number of RAID parameters"; |
1232 | return -EINVAL; | |
1233 | } | |
1234 | argc--; | |
1235 | argv++; | |
1236 | ||
1237 | /* Skip over RAID params for now and find out # of devices */ | |
3ca5a21a | 1238 | if (num_raid_params >= argc) { |
9d09e663 N |
1239 | ti->error = "Arguments do not agree with counts given"; |
1240 | return -EINVAL; | |
1241 | } | |
1242 | ||
b29bebd6 | 1243 | if ((kstrtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || |
9d09e663 N |
1244 | (num_raid_devs >= INT_MAX)) { |
1245 | ti->error = "Cannot understand number of raid devices"; | |
1246 | return -EINVAL; | |
1247 | } | |
1248 | ||
3ca5a21a DC |
1249 | argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */ |
1250 | if (argc != (num_raid_devs * 2)) { | |
1251 | ti->error = "Supplied RAID devices does not match the count given"; | |
1252 | return -EINVAL; | |
1253 | } | |
1254 | ||
9d09e663 N |
1255 | rs = context_alloc(ti, rt, (unsigned)num_raid_devs); |
1256 | if (IS_ERR(rs)) | |
1257 | return PTR_ERR(rs); | |
1258 | ||
1259 | ret = parse_raid_params(rs, argv, (unsigned)num_raid_params); | |
1260 | if (ret) | |
1261 | goto bad; | |
1262 | ||
9d09e663 N |
1263 | argv += num_raid_params + 1; |
1264 | ||
9d09e663 N |
1265 | ret = dev_parms(rs, argv); |
1266 | if (ret) | |
1267 | goto bad; | |
1268 | ||
b12d437b JB |
1269 | rs->md.sync_super = super_sync; |
1270 | ret = analyse_superblocks(ti, rs); | |
1271 | if (ret) | |
1272 | goto bad; | |
1273 | ||
9d09e663 | 1274 | INIT_WORK(&rs->md.event_work, do_table_event); |
9d09e663 | 1275 | ti->private = rs; |
55a62eef | 1276 | ti->num_flush_bios = 1; |
9d09e663 | 1277 | |
75b8e04b HM |
1278 | /* |
1279 | * Disable/enable discard support on RAID set. | |
1280 | */ | |
1281 | configure_discard_support(ti, rs); | |
1282 | ||
9d09e663 N |
1283 | mutex_lock(&rs->md.reconfig_mutex); |
1284 | ret = md_run(&rs->md); | |
1285 | rs->md.in_sync = 0; /* Assume already marked dirty */ | |
1286 | mutex_unlock(&rs->md.reconfig_mutex); | |
1287 | ||
1288 | if (ret) { | |
1289 | ti->error = "Fail to run raid array"; | |
1290 | goto bad; | |
1291 | } | |
1292 | ||
63f33b8d JB |
1293 | if (ti->len != rs->md.array_sectors) { |
1294 | ti->error = "Array size does not match requested target length"; | |
1295 | ret = -EINVAL; | |
1296 | goto size_mismatch; | |
1297 | } | |
9d09e663 | 1298 | rs->callbacks.congested_fn = raid_is_congested; |
9d09e663 N |
1299 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
1300 | ||
32737279 | 1301 | mddev_suspend(&rs->md); |
9d09e663 N |
1302 | return 0; |
1303 | ||
63f33b8d JB |
1304 | size_mismatch: |
1305 | md_stop(&rs->md); | |
9d09e663 N |
1306 | bad: |
1307 | context_free(rs); | |
1308 | ||
1309 | return ret; | |
1310 | } | |
1311 | ||
1312 | static void raid_dtr(struct dm_target *ti) | |
1313 | { | |
1314 | struct raid_set *rs = ti->private; | |
1315 | ||
1316 | list_del_init(&rs->callbacks.list); | |
1317 | md_stop(&rs->md); | |
1318 | context_free(rs); | |
1319 | } | |
1320 | ||
7de3ee57 | 1321 | static int raid_map(struct dm_target *ti, struct bio *bio) |
9d09e663 N |
1322 | { |
1323 | struct raid_set *rs = ti->private; | |
fd01b88c | 1324 | struct mddev *mddev = &rs->md; |
9d09e663 N |
1325 | |
1326 | mddev->pers->make_request(mddev, bio); | |
1327 | ||
1328 | return DM_MAPIO_SUBMITTED; | |
1329 | } | |
1330 | ||
be83651f JB |
1331 | static const char *decipher_sync_action(struct mddev *mddev) |
1332 | { | |
1333 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
1334 | return "frozen"; | |
1335 | ||
1336 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1337 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { | |
1338 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
1339 | return "reshape"; | |
1340 | ||
1341 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
1342 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1343 | return "resync"; | |
1344 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
1345 | return "check"; | |
1346 | return "repair"; | |
1347 | } | |
1348 | ||
1349 | if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) | |
1350 | return "recover"; | |
1351 | } | |
1352 | ||
1353 | return "idle"; | |
1354 | } | |
1355 | ||
fd7c092e MP |
1356 | static void raid_status(struct dm_target *ti, status_type_t type, |
1357 | unsigned status_flags, char *result, unsigned maxlen) | |
9d09e663 N |
1358 | { |
1359 | struct raid_set *rs = ti->private; | |
1360 | unsigned raid_param_cnt = 1; /* at least 1 for chunksize */ | |
1361 | unsigned sz = 0; | |
2e727c3c | 1362 | int i, array_in_sync = 0; |
9d09e663 N |
1363 | sector_t sync; |
1364 | ||
1365 | switch (type) { | |
1366 | case STATUSTYPE_INFO: | |
1367 | DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks); | |
1368 | ||
9d09e663 N |
1369 | if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery)) |
1370 | sync = rs->md.curr_resync_completed; | |
1371 | else | |
1372 | sync = rs->md.recovery_cp; | |
1373 | ||
2e727c3c | 1374 | if (sync >= rs->md.resync_max_sectors) { |
be83651f JB |
1375 | /* |
1376 | * Sync complete. | |
1377 | */ | |
2e727c3c | 1378 | array_in_sync = 1; |
9d09e663 | 1379 | sync = rs->md.resync_max_sectors; |
be83651f JB |
1380 | } else if (test_bit(MD_RECOVERY_REQUESTED, &rs->md.recovery)) { |
1381 | /* | |
1382 | * If "check" or "repair" is occurring, the array has | |
1383 | * undergone and initial sync and the health characters | |
1384 | * should not be 'a' anymore. | |
1385 | */ | |
1386 | array_in_sync = 1; | |
2e727c3c JB |
1387 | } else { |
1388 | /* | |
1389 | * The array may be doing an initial sync, or it may | |
1390 | * be rebuilding individual components. If all the | |
1391 | * devices are In_sync, then it is the array that is | |
1392 | * being initialized. | |
1393 | */ | |
1394 | for (i = 0; i < rs->md.raid_disks; i++) | |
1395 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1396 | array_in_sync = 1; | |
1397 | } | |
be83651f | 1398 | |
2e727c3c JB |
1399 | /* |
1400 | * Status characters: | |
1401 | * 'D' = Dead/Failed device | |
1402 | * 'a' = Alive but not in-sync | |
1403 | * 'A' = Alive and in-sync | |
1404 | */ | |
1405 | for (i = 0; i < rs->md.raid_disks; i++) { | |
1406 | if (test_bit(Faulty, &rs->dev[i].rdev.flags)) | |
1407 | DMEMIT("D"); | |
1408 | else if (!array_in_sync || | |
1409 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1410 | DMEMIT("a"); | |
1411 | else | |
1412 | DMEMIT("A"); | |
1413 | } | |
9d09e663 | 1414 | |
2e727c3c JB |
1415 | /* |
1416 | * In-sync ratio: | |
1417 | * The in-sync ratio shows the progress of: | |
1418 | * - Initializing the array | |
1419 | * - Rebuilding a subset of devices of the array | |
1420 | * The user can distinguish between the two by referring | |
1421 | * to the status characters. | |
1422 | */ | |
9d09e663 N |
1423 | DMEMIT(" %llu/%llu", |
1424 | (unsigned long long) sync, | |
1425 | (unsigned long long) rs->md.resync_max_sectors); | |
1426 | ||
be83651f JB |
1427 | /* |
1428 | * Sync action: | |
1429 | * See Documentation/device-mapper/dm-raid.c for | |
1430 | * information on each of these states. | |
1431 | */ | |
1432 | DMEMIT(" %s", decipher_sync_action(&rs->md)); | |
1433 | ||
1434 | /* | |
1435 | * resync_mismatches/mismatch_cnt | |
1436 | * This field shows the number of discrepancies found when | |
1437 | * performing a "check" of the array. | |
1438 | */ | |
1439 | DMEMIT(" %llu", | |
c4a39551 | 1440 | (strcmp(rs->md.last_sync_action, "check")) ? 0 : |
be83651f JB |
1441 | (unsigned long long) |
1442 | atomic64_read(&rs->md.resync_mismatches)); | |
9d09e663 N |
1443 | break; |
1444 | case STATUSTYPE_TABLE: | |
1445 | /* The string you would use to construct this array */ | |
46bed2b5 | 1446 | for (i = 0; i < rs->md.raid_disks; i++) { |
13c87583 JB |
1447 | if ((rs->print_flags & DMPF_REBUILD) && |
1448 | rs->dev[i].data_dev && | |
9d09e663 | 1449 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
13c87583 | 1450 | raid_param_cnt += 2; /* for rebuilds */ |
46bed2b5 JB |
1451 | if (rs->dev[i].data_dev && |
1452 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1453 | raid_param_cnt += 2; | |
1454 | } | |
9d09e663 | 1455 | |
34f8ac6d | 1456 | raid_param_cnt += (hweight32(rs->print_flags & ~DMPF_REBUILD) * 2); |
9d09e663 N |
1457 | if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)) |
1458 | raid_param_cnt--; | |
1459 | ||
1460 | DMEMIT("%s %u %u", rs->raid_type->name, | |
1461 | raid_param_cnt, rs->md.chunk_sectors); | |
1462 | ||
1463 | if ((rs->print_flags & DMPF_SYNC) && | |
1464 | (rs->md.recovery_cp == MaxSector)) | |
1465 | DMEMIT(" sync"); | |
1466 | if (rs->print_flags & DMPF_NOSYNC) | |
1467 | DMEMIT(" nosync"); | |
1468 | ||
1469 | for (i = 0; i < rs->md.raid_disks; i++) | |
13c87583 JB |
1470 | if ((rs->print_flags & DMPF_REBUILD) && |
1471 | rs->dev[i].data_dev && | |
9d09e663 N |
1472 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
1473 | DMEMIT(" rebuild %u", i); | |
1474 | ||
1475 | if (rs->print_flags & DMPF_DAEMON_SLEEP) | |
1476 | DMEMIT(" daemon_sleep %lu", | |
1477 | rs->md.bitmap_info.daemon_sleep); | |
1478 | ||
1479 | if (rs->print_flags & DMPF_MIN_RECOVERY_RATE) | |
1480 | DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min); | |
1481 | ||
1482 | if (rs->print_flags & DMPF_MAX_RECOVERY_RATE) | |
1483 | DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max); | |
1484 | ||
46bed2b5 JB |
1485 | for (i = 0; i < rs->md.raid_disks; i++) |
1486 | if (rs->dev[i].data_dev && | |
1487 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1488 | DMEMIT(" write_mostly %u", i); | |
1489 | ||
9d09e663 N |
1490 | if (rs->print_flags & DMPF_MAX_WRITE_BEHIND) |
1491 | DMEMIT(" max_write_behind %lu", | |
1492 | rs->md.bitmap_info.max_write_behind); | |
1493 | ||
1494 | if (rs->print_flags & DMPF_STRIPE_CACHE) { | |
d1688a6d | 1495 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1496 | |
1497 | /* convert from kiB to sectors */ | |
1498 | DMEMIT(" stripe_cache %d", | |
1499 | conf ? conf->max_nr_stripes * 2 : 0); | |
1500 | } | |
1501 | ||
c1084561 JB |
1502 | if (rs->print_flags & DMPF_REGION_SIZE) |
1503 | DMEMIT(" region_size %lu", | |
1504 | rs->md.bitmap_info.chunksize >> 9); | |
1505 | ||
63f33b8d JB |
1506 | if (rs->print_flags & DMPF_RAID10_COPIES) |
1507 | DMEMIT(" raid10_copies %u", | |
1508 | raid10_md_layout_to_copies(rs->md.layout)); | |
1509 | ||
1510 | if (rs->print_flags & DMPF_RAID10_FORMAT) | |
fe5d2f4a JB |
1511 | DMEMIT(" raid10_format %s", |
1512 | raid10_md_layout_to_format(rs->md.layout)); | |
63f33b8d | 1513 | |
9d09e663 N |
1514 | DMEMIT(" %d", rs->md.raid_disks); |
1515 | for (i = 0; i < rs->md.raid_disks; i++) { | |
b12d437b JB |
1516 | if (rs->dev[i].meta_dev) |
1517 | DMEMIT(" %s", rs->dev[i].meta_dev->name); | |
1518 | else | |
1519 | DMEMIT(" -"); | |
9d09e663 N |
1520 | |
1521 | if (rs->dev[i].data_dev) | |
1522 | DMEMIT(" %s", rs->dev[i].data_dev->name); | |
1523 | else | |
1524 | DMEMIT(" -"); | |
1525 | } | |
1526 | } | |
9d09e663 N |
1527 | } |
1528 | ||
be83651f JB |
1529 | static int raid_message(struct dm_target *ti, unsigned argc, char **argv) |
1530 | { | |
1531 | struct raid_set *rs = ti->private; | |
1532 | struct mddev *mddev = &rs->md; | |
1533 | ||
1534 | if (!strcasecmp(argv[0], "reshape")) { | |
1535 | DMERR("Reshape not supported."); | |
1536 | return -EINVAL; | |
1537 | } | |
1538 | ||
1539 | if (!mddev->pers || !mddev->pers->sync_request) | |
1540 | return -EINVAL; | |
1541 | ||
1542 | if (!strcasecmp(argv[0], "frozen")) | |
1543 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
1544 | else | |
1545 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
1546 | ||
1547 | if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) { | |
1548 | if (mddev->sync_thread) { | |
1549 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1550 | md_reap_sync_thread(mddev); | |
1551 | } | |
1552 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1553 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
1554 | return -EBUSY; | |
1555 | else if (!strcasecmp(argv[0], "resync")) | |
1556 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1557 | else if (!strcasecmp(argv[0], "recover")) { | |
1558 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
1559 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1560 | } else { | |
1561 | if (!strcasecmp(argv[0], "check")) | |
1562 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
1563 | else if (!!strcasecmp(argv[0], "repair")) | |
1564 | return -EINVAL; | |
1565 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
1566 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
1567 | } | |
1568 | if (mddev->ro == 2) { | |
1569 | /* A write to sync_action is enough to justify | |
1570 | * canceling read-auto mode | |
1571 | */ | |
1572 | mddev->ro = 0; | |
1573 | if (!mddev->suspended) | |
1574 | md_wakeup_thread(mddev->sync_thread); | |
1575 | } | |
1576 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1577 | if (!mddev->suspended) | |
1578 | md_wakeup_thread(mddev->thread); | |
1579 | ||
1580 | return 0; | |
1581 | } | |
1582 | ||
1583 | static int raid_iterate_devices(struct dm_target *ti, | |
1584 | iterate_devices_callout_fn fn, void *data) | |
9d09e663 N |
1585 | { |
1586 | struct raid_set *rs = ti->private; | |
1587 | unsigned i; | |
1588 | int ret = 0; | |
1589 | ||
1590 | for (i = 0; !ret && i < rs->md.raid_disks; i++) | |
1591 | if (rs->dev[i].data_dev) | |
1592 | ret = fn(ti, | |
1593 | rs->dev[i].data_dev, | |
1594 | 0, /* No offset on data devs */ | |
1595 | rs->md.dev_sectors, | |
1596 | data); | |
1597 | ||
1598 | return ret; | |
1599 | } | |
1600 | ||
1601 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) | |
1602 | { | |
1603 | struct raid_set *rs = ti->private; | |
1604 | unsigned chunk_size = rs->md.chunk_sectors << 9; | |
d1688a6d | 1605 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1606 | |
1607 | blk_limits_io_min(limits, chunk_size); | |
1608 | blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); | |
1609 | } | |
1610 | ||
1611 | static void raid_presuspend(struct dm_target *ti) | |
1612 | { | |
1613 | struct raid_set *rs = ti->private; | |
1614 | ||
1615 | md_stop_writes(&rs->md); | |
1616 | } | |
1617 | ||
1618 | static void raid_postsuspend(struct dm_target *ti) | |
1619 | { | |
1620 | struct raid_set *rs = ti->private; | |
1621 | ||
1622 | mddev_suspend(&rs->md); | |
1623 | } | |
1624 | ||
f381e71b | 1625 | static void attempt_restore_of_faulty_devices(struct raid_set *rs) |
9d09e663 | 1626 | { |
9092c02d JB |
1627 | int i; |
1628 | uint64_t failed_devices, cleared_failed_devices = 0; | |
1629 | unsigned long flags; | |
1630 | struct dm_raid_superblock *sb; | |
9092c02d | 1631 | struct md_rdev *r; |
9d09e663 | 1632 | |
f381e71b JB |
1633 | for (i = 0; i < rs->md.raid_disks; i++) { |
1634 | r = &rs->dev[i].rdev; | |
1635 | if (test_bit(Faulty, &r->flags) && r->sb_page && | |
1636 | sync_page_io(r, 0, r->sb_size, r->sb_page, READ, 1)) { | |
1637 | DMINFO("Faulty %s device #%d has readable super block." | |
1638 | " Attempting to revive it.", | |
1639 | rs->raid_type->name, i); | |
a4dc163a JB |
1640 | |
1641 | /* | |
1642 | * Faulty bit may be set, but sometimes the array can | |
1643 | * be suspended before the personalities can respond | |
1644 | * by removing the device from the array (i.e. calling | |
1645 | * 'hot_remove_disk'). If they haven't yet removed | |
1646 | * the failed device, its 'raid_disk' number will be | |
1647 | * '>= 0' - meaning we must call this function | |
1648 | * ourselves. | |
1649 | */ | |
1650 | if ((r->raid_disk >= 0) && | |
1651 | (r->mddev->pers->hot_remove_disk(r->mddev, r) != 0)) | |
1652 | /* Failed to revive this device, try next */ | |
1653 | continue; | |
1654 | ||
f381e71b JB |
1655 | r->raid_disk = i; |
1656 | r->saved_raid_disk = i; | |
1657 | flags = r->flags; | |
1658 | clear_bit(Faulty, &r->flags); | |
1659 | clear_bit(WriteErrorSeen, &r->flags); | |
1660 | clear_bit(In_sync, &r->flags); | |
1661 | if (r->mddev->pers->hot_add_disk(r->mddev, r)) { | |
1662 | r->raid_disk = -1; | |
1663 | r->saved_raid_disk = -1; | |
1664 | r->flags = flags; | |
1665 | } else { | |
1666 | r->recovery_offset = 0; | |
1667 | cleared_failed_devices |= 1 << i; | |
1668 | } | |
1669 | } | |
1670 | } | |
1671 | if (cleared_failed_devices) { | |
1672 | rdev_for_each(r, &rs->md) { | |
1673 | sb = page_address(r->sb_page); | |
1674 | failed_devices = le64_to_cpu(sb->failed_devices); | |
1675 | failed_devices &= ~cleared_failed_devices; | |
1676 | sb->failed_devices = cpu_to_le64(failed_devices); | |
1677 | } | |
1678 | } | |
1679 | } | |
1680 | ||
1681 | static void raid_resume(struct dm_target *ti) | |
1682 | { | |
1683 | struct raid_set *rs = ti->private; | |
1684 | ||
81f382f9 | 1685 | set_bit(MD_CHANGE_DEVS, &rs->md.flags); |
34f8ac6d JB |
1686 | if (!rs->bitmap_loaded) { |
1687 | bitmap_load(&rs->md); | |
1688 | rs->bitmap_loaded = 1; | |
9092c02d JB |
1689 | } else { |
1690 | /* | |
1691 | * A secondary resume while the device is active. | |
1692 | * Take this opportunity to check whether any failed | |
1693 | * devices are reachable again. | |
1694 | */ | |
f381e71b | 1695 | attempt_restore_of_faulty_devices(rs); |
47525e59 | 1696 | } |
34f8ac6d | 1697 | |
47525e59 | 1698 | clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); |
9d09e663 N |
1699 | mddev_resume(&rs->md); |
1700 | } | |
1701 | ||
1702 | static struct target_type raid_target = { | |
1703 | .name = "raid", | |
75b8e04b | 1704 | .version = {1, 6, 0}, |
9d09e663 N |
1705 | .module = THIS_MODULE, |
1706 | .ctr = raid_ctr, | |
1707 | .dtr = raid_dtr, | |
1708 | .map = raid_map, | |
1709 | .status = raid_status, | |
be83651f | 1710 | .message = raid_message, |
9d09e663 N |
1711 | .iterate_devices = raid_iterate_devices, |
1712 | .io_hints = raid_io_hints, | |
1713 | .presuspend = raid_presuspend, | |
1714 | .postsuspend = raid_postsuspend, | |
1715 | .resume = raid_resume, | |
1716 | }; | |
1717 | ||
1718 | static int __init dm_raid_init(void) | |
1719 | { | |
fe5d2f4a JB |
1720 | DMINFO("Loading target version %u.%u.%u", |
1721 | raid_target.version[0], | |
1722 | raid_target.version[1], | |
1723 | raid_target.version[2]); | |
9d09e663 N |
1724 | return dm_register_target(&raid_target); |
1725 | } | |
1726 | ||
1727 | static void __exit dm_raid_exit(void) | |
1728 | { | |
1729 | dm_unregister_target(&raid_target); | |
1730 | } | |
1731 | ||
1732 | module_init(dm_raid_init); | |
1733 | module_exit(dm_raid_exit); | |
1734 | ||
48cf06bc HM |
1735 | module_param(devices_handle_discard_safely, bool, 0644); |
1736 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
1737 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
1738 | ||
9d09e663 | 1739 | MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); |
63f33b8d JB |
1740 | MODULE_ALIAS("dm-raid1"); |
1741 | MODULE_ALIAS("dm-raid10"); | |
9d09e663 N |
1742 | MODULE_ALIAS("dm-raid4"); |
1743 | MODULE_ALIAS("dm-raid5"); | |
1744 | MODULE_ALIAS("dm-raid6"); | |
1745 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); | |
1746 | MODULE_LICENSE("GPL"); |