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9d09e663 N |
1 | /* |
2 | * Copyright (C) 2010-2011 Neil Brown | |
3 | * Copyright (C) 2010-2011 Red Hat, Inc. All rights reserved. | |
4 | * | |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
8 | #include <linux/slab.h> | |
9 | ||
10 | #include "md.h" | |
32737279 | 11 | #include "raid1.h" |
9d09e663 | 12 | #include "raid5.h" |
9d09e663 N |
13 | #include "bitmap.h" |
14 | ||
3e8dbb7f AK |
15 | #include <linux/device-mapper.h> |
16 | ||
9d09e663 N |
17 | #define DM_MSG_PREFIX "raid" |
18 | ||
19 | /* | |
b12d437b JB |
20 | * The following flags are used by dm-raid.c to set up the array state. |
21 | * They must be cleared before md_run is called. | |
9d09e663 | 22 | */ |
b12d437b | 23 | #define FirstUse 10 /* rdev flag */ |
9d09e663 N |
24 | |
25 | struct raid_dev { | |
26 | /* | |
27 | * Two DM devices, one to hold metadata and one to hold the | |
28 | * actual data/parity. The reason for this is to not confuse | |
29 | * ti->len and give more flexibility in altering size and | |
30 | * characteristics. | |
31 | * | |
32 | * While it is possible for this device to be associated | |
33 | * with a different physical device than the data_dev, it | |
34 | * is intended for it to be the same. | |
35 | * |--------- Physical Device ---------| | |
36 | * |- meta_dev -|------ data_dev ------| | |
37 | */ | |
38 | struct dm_dev *meta_dev; | |
39 | struct dm_dev *data_dev; | |
3cb03002 | 40 | struct md_rdev rdev; |
9d09e663 N |
41 | }; |
42 | ||
43 | /* | |
44 | * Flags for rs->print_flags field. | |
45 | */ | |
13c87583 JB |
46 | #define DMPF_SYNC 0x1 |
47 | #define DMPF_NOSYNC 0x2 | |
48 | #define DMPF_REBUILD 0x4 | |
49 | #define DMPF_DAEMON_SLEEP 0x8 | |
50 | #define DMPF_MIN_RECOVERY_RATE 0x10 | |
51 | #define DMPF_MAX_RECOVERY_RATE 0x20 | |
52 | #define DMPF_MAX_WRITE_BEHIND 0x40 | |
53 | #define DMPF_STRIPE_CACHE 0x80 | |
c1084561 | 54 | #define DMPF_REGION_SIZE 0X100 |
9d09e663 N |
55 | struct raid_set { |
56 | struct dm_target *ti; | |
57 | ||
58 | uint64_t print_flags; | |
59 | ||
fd01b88c | 60 | struct mddev md; |
9d09e663 N |
61 | struct raid_type *raid_type; |
62 | struct dm_target_callbacks callbacks; | |
63 | ||
64 | struct raid_dev dev[0]; | |
65 | }; | |
66 | ||
67 | /* Supported raid types and properties. */ | |
68 | static struct raid_type { | |
69 | const char *name; /* RAID algorithm. */ | |
70 | const char *descr; /* Descriptor text for logging. */ | |
71 | const unsigned parity_devs; /* # of parity devices. */ | |
72 | const unsigned minimal_devs; /* minimal # of devices in set. */ | |
73 | const unsigned level; /* RAID level. */ | |
74 | const unsigned algorithm; /* RAID algorithm. */ | |
75 | } raid_types[] = { | |
32737279 | 76 | {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */}, |
9d09e663 N |
77 | {"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, |
78 | {"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC}, | |
79 | {"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC}, | |
80 | {"raid5_ls", "RAID5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, | |
81 | {"raid5_rs", "RAID5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, | |
82 | {"raid6_zr", "RAID6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART}, | |
83 | {"raid6_nr", "RAID6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART}, | |
84 | {"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE} | |
85 | }; | |
86 | ||
87 | static struct raid_type *get_raid_type(char *name) | |
88 | { | |
89 | int i; | |
90 | ||
91 | for (i = 0; i < ARRAY_SIZE(raid_types); i++) | |
92 | if (!strcmp(raid_types[i].name, name)) | |
93 | return &raid_types[i]; | |
94 | ||
95 | return NULL; | |
96 | } | |
97 | ||
98 | static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs) | |
99 | { | |
100 | unsigned i; | |
101 | struct raid_set *rs; | |
102 | sector_t sectors_per_dev; | |
103 | ||
104 | if (raid_devs <= raid_type->parity_devs) { | |
105 | ti->error = "Insufficient number of devices"; | |
106 | return ERR_PTR(-EINVAL); | |
107 | } | |
108 | ||
109 | sectors_per_dev = ti->len; | |
32737279 JB |
110 | if ((raid_type->level > 1) && |
111 | sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) { | |
9d09e663 N |
112 | ti->error = "Target length not divisible by number of data devices"; |
113 | return ERR_PTR(-EINVAL); | |
114 | } | |
115 | ||
116 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); | |
117 | if (!rs) { | |
118 | ti->error = "Cannot allocate raid context"; | |
119 | return ERR_PTR(-ENOMEM); | |
120 | } | |
121 | ||
122 | mddev_init(&rs->md); | |
123 | ||
124 | rs->ti = ti; | |
125 | rs->raid_type = raid_type; | |
126 | rs->md.raid_disks = raid_devs; | |
127 | rs->md.level = raid_type->level; | |
128 | rs->md.new_level = rs->md.level; | |
129 | rs->md.dev_sectors = sectors_per_dev; | |
130 | rs->md.layout = raid_type->algorithm; | |
131 | rs->md.new_layout = rs->md.layout; | |
132 | rs->md.delta_disks = 0; | |
133 | rs->md.recovery_cp = 0; | |
134 | ||
135 | for (i = 0; i < raid_devs; i++) | |
136 | md_rdev_init(&rs->dev[i].rdev); | |
137 | ||
138 | /* | |
139 | * Remaining items to be initialized by further RAID params: | |
140 | * rs->md.persistent | |
141 | * rs->md.external | |
142 | * rs->md.chunk_sectors | |
143 | * rs->md.new_chunk_sectors | |
144 | */ | |
145 | ||
146 | return rs; | |
147 | } | |
148 | ||
149 | static void context_free(struct raid_set *rs) | |
150 | { | |
151 | int i; | |
152 | ||
b12d437b JB |
153 | for (i = 0; i < rs->md.raid_disks; i++) { |
154 | if (rs->dev[i].meta_dev) | |
155 | dm_put_device(rs->ti, rs->dev[i].meta_dev); | |
156 | if (rs->dev[i].rdev.sb_page) | |
157 | put_page(rs->dev[i].rdev.sb_page); | |
158 | rs->dev[i].rdev.sb_page = NULL; | |
159 | rs->dev[i].rdev.sb_loaded = 0; | |
9d09e663 N |
160 | if (rs->dev[i].data_dev) |
161 | dm_put_device(rs->ti, rs->dev[i].data_dev); | |
b12d437b | 162 | } |
9d09e663 N |
163 | |
164 | kfree(rs); | |
165 | } | |
166 | ||
167 | /* | |
168 | * For every device we have two words | |
169 | * <meta_dev>: meta device name or '-' if missing | |
170 | * <data_dev>: data device name or '-' if missing | |
171 | * | |
b12d437b JB |
172 | * The following are permitted: |
173 | * - - | |
174 | * - <data_dev> | |
175 | * <meta_dev> <data_dev> | |
176 | * | |
177 | * The following is not allowed: | |
178 | * <meta_dev> - | |
179 | * | |
180 | * This code parses those words. If there is a failure, | |
181 | * the caller must use context_free to unwind the operations. | |
9d09e663 N |
182 | */ |
183 | static int dev_parms(struct raid_set *rs, char **argv) | |
184 | { | |
185 | int i; | |
186 | int rebuild = 0; | |
187 | int metadata_available = 0; | |
188 | int ret = 0; | |
189 | ||
190 | for (i = 0; i < rs->md.raid_disks; i++, argv += 2) { | |
191 | rs->dev[i].rdev.raid_disk = i; | |
192 | ||
193 | rs->dev[i].meta_dev = NULL; | |
194 | rs->dev[i].data_dev = NULL; | |
195 | ||
196 | /* | |
197 | * There are no offsets, since there is a separate device | |
198 | * for data and metadata. | |
199 | */ | |
200 | rs->dev[i].rdev.data_offset = 0; | |
201 | rs->dev[i].rdev.mddev = &rs->md; | |
202 | ||
203 | if (strcmp(argv[0], "-")) { | |
b12d437b JB |
204 | ret = dm_get_device(rs->ti, argv[0], |
205 | dm_table_get_mode(rs->ti->table), | |
206 | &rs->dev[i].meta_dev); | |
207 | rs->ti->error = "RAID metadata device lookup failure"; | |
208 | if (ret) | |
209 | return ret; | |
210 | ||
211 | rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); | |
212 | if (!rs->dev[i].rdev.sb_page) | |
213 | return -ENOMEM; | |
9d09e663 N |
214 | } |
215 | ||
216 | if (!strcmp(argv[1], "-")) { | |
217 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && | |
218 | (!rs->dev[i].rdev.recovery_offset)) { | |
219 | rs->ti->error = "Drive designated for rebuild not specified"; | |
220 | return -EINVAL; | |
221 | } | |
222 | ||
b12d437b JB |
223 | rs->ti->error = "No data device supplied with metadata device"; |
224 | if (rs->dev[i].meta_dev) | |
225 | return -EINVAL; | |
226 | ||
9d09e663 N |
227 | continue; |
228 | } | |
229 | ||
230 | ret = dm_get_device(rs->ti, argv[1], | |
231 | dm_table_get_mode(rs->ti->table), | |
232 | &rs->dev[i].data_dev); | |
233 | if (ret) { | |
234 | rs->ti->error = "RAID device lookup failure"; | |
235 | return ret; | |
236 | } | |
237 | ||
b12d437b JB |
238 | if (rs->dev[i].meta_dev) { |
239 | metadata_available = 1; | |
240 | rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; | |
241 | } | |
9d09e663 N |
242 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
243 | list_add(&rs->dev[i].rdev.same_set, &rs->md.disks); | |
244 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
245 | rebuild++; | |
246 | } | |
247 | ||
248 | if (metadata_available) { | |
249 | rs->md.external = 0; | |
250 | rs->md.persistent = 1; | |
251 | rs->md.major_version = 2; | |
252 | } else if (rebuild && !rs->md.recovery_cp) { | |
253 | /* | |
254 | * Without metadata, we will not be able to tell if the array | |
255 | * is in-sync or not - we must assume it is not. Therefore, | |
256 | * it is impossible to rebuild a drive. | |
257 | * | |
258 | * Even if there is metadata, the on-disk information may | |
259 | * indicate that the array is not in-sync and it will then | |
260 | * fail at that time. | |
261 | * | |
262 | * User could specify 'nosync' option if desperate. | |
263 | */ | |
264 | DMERR("Unable to rebuild drive while array is not in-sync"); | |
265 | rs->ti->error = "RAID device lookup failure"; | |
266 | return -EINVAL; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
c1084561 JB |
272 | /* |
273 | * validate_region_size | |
274 | * @rs | |
275 | * @region_size: region size in sectors. If 0, pick a size (4MiB default). | |
276 | * | |
277 | * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). | |
278 | * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. | |
279 | * | |
280 | * Returns: 0 on success, -EINVAL on failure. | |
281 | */ | |
282 | static int validate_region_size(struct raid_set *rs, unsigned long region_size) | |
283 | { | |
284 | unsigned long min_region_size = rs->ti->len / (1 << 21); | |
285 | ||
286 | if (!region_size) { | |
287 | /* | |
288 | * Choose a reasonable default. All figures in sectors. | |
289 | */ | |
290 | if (min_region_size > (1 << 13)) { | |
291 | DMINFO("Choosing default region size of %lu sectors", | |
292 | region_size); | |
293 | region_size = min_region_size; | |
294 | } else { | |
295 | DMINFO("Choosing default region size of 4MiB"); | |
296 | region_size = 1 << 13; /* sectors */ | |
297 | } | |
298 | } else { | |
299 | /* | |
300 | * Validate user-supplied value. | |
301 | */ | |
302 | if (region_size > rs->ti->len) { | |
303 | rs->ti->error = "Supplied region size is too large"; | |
304 | return -EINVAL; | |
305 | } | |
306 | ||
307 | if (region_size < min_region_size) { | |
308 | DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", | |
309 | region_size, min_region_size); | |
310 | rs->ti->error = "Supplied region size is too small"; | |
311 | return -EINVAL; | |
312 | } | |
313 | ||
314 | if (!is_power_of_2(region_size)) { | |
315 | rs->ti->error = "Region size is not a power of 2"; | |
316 | return -EINVAL; | |
317 | } | |
318 | ||
319 | if (region_size < rs->md.chunk_sectors) { | |
320 | rs->ti->error = "Region size is smaller than the chunk size"; | |
321 | return -EINVAL; | |
322 | } | |
323 | } | |
324 | ||
325 | /* | |
326 | * Convert sectors to bytes. | |
327 | */ | |
328 | rs->md.bitmap_info.chunksize = (region_size << 9); | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
9d09e663 N |
333 | /* |
334 | * Possible arguments are... | |
9d09e663 N |
335 | * <chunk_size> [optional_args] |
336 | * | |
32737279 JB |
337 | * Argument definitions |
338 | * <chunk_size> The number of sectors per disk that | |
339 | * will form the "stripe" | |
340 | * [[no]sync] Force or prevent recovery of the | |
341 | * entire array | |
9d09e663 | 342 | * [rebuild <idx>] Rebuild the drive indicated by the index |
32737279 JB |
343 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
344 | * clear bits | |
9d09e663 N |
345 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
346 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization | |
46bed2b5 | 347 | * [write_mostly <idx>] Indicate a write mostly drive via index |
9d09e663 N |
348 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
349 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs | |
c1084561 | 350 | * [region_size <sectors>] Defines granularity of bitmap |
9d09e663 N |
351 | */ |
352 | static int parse_raid_params(struct raid_set *rs, char **argv, | |
353 | unsigned num_raid_params) | |
354 | { | |
355 | unsigned i, rebuild_cnt = 0; | |
c1084561 | 356 | unsigned long value, region_size = 0; |
9d09e663 N |
357 | char *key; |
358 | ||
359 | /* | |
360 | * First, parse the in-order required arguments | |
32737279 | 361 | * "chunk_size" is the only argument of this type. |
9d09e663 | 362 | */ |
32737279 | 363 | if ((strict_strtoul(argv[0], 10, &value) < 0)) { |
9d09e663 N |
364 | rs->ti->error = "Bad chunk size"; |
365 | return -EINVAL; | |
32737279 JB |
366 | } else if (rs->raid_type->level == 1) { |
367 | if (value) | |
368 | DMERR("Ignoring chunk size parameter for RAID 1"); | |
369 | value = 0; | |
370 | } else if (!is_power_of_2(value)) { | |
371 | rs->ti->error = "Chunk size must be a power of 2"; | |
372 | return -EINVAL; | |
373 | } else if (value < 8) { | |
374 | rs->ti->error = "Chunk size value is too small"; | |
375 | return -EINVAL; | |
9d09e663 N |
376 | } |
377 | ||
378 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; | |
379 | argv++; | |
380 | num_raid_params--; | |
381 | ||
382 | /* | |
b12d437b JB |
383 | * We set each individual device as In_sync with a completed |
384 | * 'recovery_offset'. If there has been a device failure or | |
385 | * replacement then one of the following cases applies: | |
386 | * | |
387 | * 1) User specifies 'rebuild'. | |
388 | * - Device is reset when param is read. | |
389 | * 2) A new device is supplied. | |
390 | * - No matching superblock found, resets device. | |
391 | * 3) Device failure was transient and returns on reload. | |
392 | * - Failure noticed, resets device for bitmap replay. | |
393 | * 4) Device hadn't completed recovery after previous failure. | |
394 | * - Superblock is read and overrides recovery_offset. | |
395 | * | |
396 | * What is found in the superblocks of the devices is always | |
397 | * authoritative, unless 'rebuild' or '[no]sync' was specified. | |
9d09e663 | 398 | */ |
b12d437b | 399 | for (i = 0; i < rs->md.raid_disks; i++) { |
9d09e663 | 400 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
b12d437b JB |
401 | rs->dev[i].rdev.recovery_offset = MaxSector; |
402 | } | |
9d09e663 | 403 | |
b12d437b JB |
404 | /* |
405 | * Second, parse the unordered optional arguments | |
406 | */ | |
9d09e663 | 407 | for (i = 0; i < num_raid_params; i++) { |
13c87583 | 408 | if (!strcasecmp(argv[i], "nosync")) { |
9d09e663 N |
409 | rs->md.recovery_cp = MaxSector; |
410 | rs->print_flags |= DMPF_NOSYNC; | |
9d09e663 N |
411 | continue; |
412 | } | |
13c87583 | 413 | if (!strcasecmp(argv[i], "sync")) { |
9d09e663 N |
414 | rs->md.recovery_cp = 0; |
415 | rs->print_flags |= DMPF_SYNC; | |
9d09e663 N |
416 | continue; |
417 | } | |
418 | ||
419 | /* The rest of the optional arguments come in key/value pairs */ | |
420 | if ((i + 1) >= num_raid_params) { | |
421 | rs->ti->error = "Wrong number of raid parameters given"; | |
422 | return -EINVAL; | |
423 | } | |
424 | ||
425 | key = argv[i++]; | |
426 | if (strict_strtoul(argv[i], 10, &value) < 0) { | |
427 | rs->ti->error = "Bad numerical argument given in raid params"; | |
428 | return -EINVAL; | |
429 | } | |
430 | ||
13c87583 | 431 | if (!strcasecmp(key, "rebuild")) { |
32737279 JB |
432 | rebuild_cnt++; |
433 | if (((rs->raid_type->level != 1) && | |
434 | (rebuild_cnt > rs->raid_type->parity_devs)) || | |
435 | ((rs->raid_type->level == 1) && | |
436 | (rebuild_cnt > (rs->md.raid_disks - 1)))) { | |
437 | rs->ti->error = "Too many rebuild devices specified for given RAID type"; | |
9d09e663 N |
438 | return -EINVAL; |
439 | } | |
440 | if (value > rs->md.raid_disks) { | |
441 | rs->ti->error = "Invalid rebuild index given"; | |
442 | return -EINVAL; | |
443 | } | |
444 | clear_bit(In_sync, &rs->dev[value].rdev.flags); | |
445 | rs->dev[value].rdev.recovery_offset = 0; | |
13c87583 | 446 | rs->print_flags |= DMPF_REBUILD; |
46bed2b5 JB |
447 | } else if (!strcasecmp(key, "write_mostly")) { |
448 | if (rs->raid_type->level != 1) { | |
449 | rs->ti->error = "write_mostly option is only valid for RAID1"; | |
450 | return -EINVAL; | |
451 | } | |
82324809 | 452 | if (value >= rs->md.raid_disks) { |
46bed2b5 JB |
453 | rs->ti->error = "Invalid write_mostly drive index given"; |
454 | return -EINVAL; | |
455 | } | |
456 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); | |
13c87583 | 457 | } else if (!strcasecmp(key, "max_write_behind")) { |
46bed2b5 JB |
458 | if (rs->raid_type->level != 1) { |
459 | rs->ti->error = "max_write_behind option is only valid for RAID1"; | |
460 | return -EINVAL; | |
461 | } | |
9d09e663 N |
462 | rs->print_flags |= DMPF_MAX_WRITE_BEHIND; |
463 | ||
464 | /* | |
465 | * In device-mapper, we specify things in sectors, but | |
466 | * MD records this value in kB | |
467 | */ | |
468 | value /= 2; | |
469 | if (value > COUNTER_MAX) { | |
470 | rs->ti->error = "Max write-behind limit out of range"; | |
471 | return -EINVAL; | |
472 | } | |
473 | rs->md.bitmap_info.max_write_behind = value; | |
13c87583 | 474 | } else if (!strcasecmp(key, "daemon_sleep")) { |
9d09e663 N |
475 | rs->print_flags |= DMPF_DAEMON_SLEEP; |
476 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) { | |
477 | rs->ti->error = "daemon sleep period out of range"; | |
478 | return -EINVAL; | |
479 | } | |
480 | rs->md.bitmap_info.daemon_sleep = value; | |
13c87583 | 481 | } else if (!strcasecmp(key, "stripe_cache")) { |
9d09e663 N |
482 | rs->print_flags |= DMPF_STRIPE_CACHE; |
483 | ||
484 | /* | |
485 | * In device-mapper, we specify things in sectors, but | |
486 | * MD records this value in kB | |
487 | */ | |
488 | value /= 2; | |
489 | ||
490 | if (rs->raid_type->level < 5) { | |
491 | rs->ti->error = "Inappropriate argument: stripe_cache"; | |
492 | return -EINVAL; | |
493 | } | |
494 | if (raid5_set_cache_size(&rs->md, (int)value)) { | |
495 | rs->ti->error = "Bad stripe_cache size"; | |
496 | return -EINVAL; | |
497 | } | |
13c87583 | 498 | } else if (!strcasecmp(key, "min_recovery_rate")) { |
9d09e663 N |
499 | rs->print_flags |= DMPF_MIN_RECOVERY_RATE; |
500 | if (value > INT_MAX) { | |
501 | rs->ti->error = "min_recovery_rate out of range"; | |
502 | return -EINVAL; | |
503 | } | |
504 | rs->md.sync_speed_min = (int)value; | |
13c87583 | 505 | } else if (!strcasecmp(key, "max_recovery_rate")) { |
9d09e663 N |
506 | rs->print_flags |= DMPF_MAX_RECOVERY_RATE; |
507 | if (value > INT_MAX) { | |
508 | rs->ti->error = "max_recovery_rate out of range"; | |
509 | return -EINVAL; | |
510 | } | |
511 | rs->md.sync_speed_max = (int)value; | |
c1084561 JB |
512 | } else if (!strcasecmp(key, "region_size")) { |
513 | rs->print_flags |= DMPF_REGION_SIZE; | |
514 | region_size = value; | |
9d09e663 N |
515 | } else { |
516 | DMERR("Unable to parse RAID parameter: %s", key); | |
517 | rs->ti->error = "Unable to parse RAID parameters"; | |
518 | return -EINVAL; | |
519 | } | |
520 | } | |
521 | ||
c1084561 JB |
522 | if (validate_region_size(rs, region_size)) |
523 | return -EINVAL; | |
524 | ||
525 | if (rs->md.chunk_sectors) | |
526 | rs->ti->split_io = rs->md.chunk_sectors; | |
527 | else | |
528 | rs->ti->split_io = region_size; | |
529 | ||
32737279 JB |
530 | if (rs->md.chunk_sectors) |
531 | rs->ti->split_io = rs->md.chunk_sectors; | |
532 | else | |
533 | rs->ti->split_io = region_size; | |
534 | ||
9d09e663 N |
535 | /* Assume there are no metadata devices until the drives are parsed */ |
536 | rs->md.persistent = 0; | |
537 | rs->md.external = 1; | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | static void do_table_event(struct work_struct *ws) | |
543 | { | |
544 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); | |
545 | ||
546 | dm_table_event(rs->ti->table); | |
547 | } | |
548 | ||
549 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) | |
550 | { | |
551 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); | |
552 | ||
32737279 JB |
553 | if (rs->raid_type->level == 1) |
554 | return md_raid1_congested(&rs->md, bits); | |
555 | ||
9d09e663 N |
556 | return md_raid5_congested(&rs->md, bits); |
557 | } | |
558 | ||
b12d437b JB |
559 | /* |
560 | * This structure is never routinely used by userspace, unlike md superblocks. | |
561 | * Devices with this superblock should only ever be accessed via device-mapper. | |
562 | */ | |
563 | #define DM_RAID_MAGIC 0x64526D44 | |
564 | struct dm_raid_superblock { | |
565 | __le32 magic; /* "DmRd" */ | |
566 | __le32 features; /* Used to indicate possible future changes */ | |
567 | ||
568 | __le32 num_devices; /* Number of devices in this array. (Max 64) */ | |
569 | __le32 array_position; /* The position of this drive in the array */ | |
570 | ||
571 | __le64 events; /* Incremented by md when superblock updated */ | |
572 | __le64 failed_devices; /* Bit field of devices to indicate failures */ | |
573 | ||
574 | /* | |
575 | * This offset tracks the progress of the repair or replacement of | |
576 | * an individual drive. | |
577 | */ | |
578 | __le64 disk_recovery_offset; | |
579 | ||
580 | /* | |
581 | * This offset tracks the progress of the initial array | |
582 | * synchronisation/parity calculation. | |
583 | */ | |
584 | __le64 array_resync_offset; | |
585 | ||
586 | /* | |
587 | * RAID characteristics | |
588 | */ | |
589 | __le32 level; | |
590 | __le32 layout; | |
591 | __le32 stripe_sectors; | |
592 | ||
593 | __u8 pad[452]; /* Round struct to 512 bytes. */ | |
594 | /* Always set to 0 when writing. */ | |
595 | } __packed; | |
596 | ||
3cb03002 | 597 | static int read_disk_sb(struct md_rdev *rdev, int size) |
b12d437b JB |
598 | { |
599 | BUG_ON(!rdev->sb_page); | |
600 | ||
601 | if (rdev->sb_loaded) | |
602 | return 0; | |
603 | ||
604 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) { | |
605 | DMERR("Failed to read device superblock"); | |
606 | return -EINVAL; | |
607 | } | |
608 | ||
609 | rdev->sb_loaded = 1; | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
fd01b88c | 614 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b | 615 | { |
3cb03002 | 616 | struct md_rdev *r, *t; |
b12d437b JB |
617 | uint64_t failed_devices; |
618 | struct dm_raid_superblock *sb; | |
619 | ||
620 | sb = page_address(rdev->sb_page); | |
621 | failed_devices = le64_to_cpu(sb->failed_devices); | |
622 | ||
623 | rdev_for_each(r, t, mddev) | |
624 | if ((r->raid_disk >= 0) && test_bit(Faulty, &r->flags)) | |
625 | failed_devices |= (1ULL << r->raid_disk); | |
626 | ||
627 | memset(sb, 0, sizeof(*sb)); | |
628 | ||
629 | sb->magic = cpu_to_le32(DM_RAID_MAGIC); | |
630 | sb->features = cpu_to_le32(0); /* No features yet */ | |
631 | ||
632 | sb->num_devices = cpu_to_le32(mddev->raid_disks); | |
633 | sb->array_position = cpu_to_le32(rdev->raid_disk); | |
634 | ||
635 | sb->events = cpu_to_le64(mddev->events); | |
636 | sb->failed_devices = cpu_to_le64(failed_devices); | |
637 | ||
638 | sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
639 | sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); | |
640 | ||
641 | sb->level = cpu_to_le32(mddev->level); | |
642 | sb->layout = cpu_to_le32(mddev->layout); | |
643 | sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); | |
644 | } | |
645 | ||
646 | /* | |
647 | * super_load | |
648 | * | |
649 | * This function creates a superblock if one is not found on the device | |
650 | * and will decide which superblock to use if there's a choice. | |
651 | * | |
652 | * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise | |
653 | */ | |
3cb03002 | 654 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
b12d437b JB |
655 | { |
656 | int ret; | |
657 | struct dm_raid_superblock *sb; | |
658 | struct dm_raid_superblock *refsb; | |
659 | uint64_t events_sb, events_refsb; | |
660 | ||
661 | rdev->sb_start = 0; | |
662 | rdev->sb_size = sizeof(*sb); | |
663 | ||
664 | ret = read_disk_sb(rdev, rdev->sb_size); | |
665 | if (ret) | |
666 | return ret; | |
667 | ||
668 | sb = page_address(rdev->sb_page); | |
669 | if (sb->magic != cpu_to_le32(DM_RAID_MAGIC)) { | |
670 | super_sync(rdev->mddev, rdev); | |
671 | ||
672 | set_bit(FirstUse, &rdev->flags); | |
673 | ||
674 | /* Force writing of superblocks to disk */ | |
675 | set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags); | |
676 | ||
677 | /* Any superblock is better than none, choose that if given */ | |
678 | return refdev ? 0 : 1; | |
679 | } | |
680 | ||
681 | if (!refdev) | |
682 | return 1; | |
683 | ||
684 | events_sb = le64_to_cpu(sb->events); | |
685 | ||
686 | refsb = page_address(refdev->sb_page); | |
687 | events_refsb = le64_to_cpu(refsb->events); | |
688 | ||
689 | return (events_sb > events_refsb) ? 1 : 0; | |
690 | } | |
691 | ||
fd01b88c | 692 | static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
693 | { |
694 | int role; | |
695 | struct raid_set *rs = container_of(mddev, struct raid_set, md); | |
696 | uint64_t events_sb; | |
697 | uint64_t failed_devices; | |
698 | struct dm_raid_superblock *sb; | |
699 | uint32_t new_devs = 0; | |
700 | uint32_t rebuilds = 0; | |
3cb03002 | 701 | struct md_rdev *r, *t; |
b12d437b JB |
702 | struct dm_raid_superblock *sb2; |
703 | ||
704 | sb = page_address(rdev->sb_page); | |
705 | events_sb = le64_to_cpu(sb->events); | |
706 | failed_devices = le64_to_cpu(sb->failed_devices); | |
707 | ||
708 | /* | |
709 | * Initialise to 1 if this is a new superblock. | |
710 | */ | |
711 | mddev->events = events_sb ? : 1; | |
712 | ||
713 | /* | |
714 | * Reshaping is not currently allowed | |
715 | */ | |
716 | if ((le32_to_cpu(sb->level) != mddev->level) || | |
717 | (le32_to_cpu(sb->layout) != mddev->layout) || | |
718 | (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors)) { | |
719 | DMERR("Reshaping arrays not yet supported."); | |
720 | return -EINVAL; | |
721 | } | |
722 | ||
723 | /* We can only change the number of devices in RAID1 right now */ | |
724 | if ((rs->raid_type->level != 1) && | |
725 | (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) { | |
726 | DMERR("Reshaping arrays not yet supported."); | |
727 | return -EINVAL; | |
728 | } | |
729 | ||
730 | if (!(rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))) | |
731 | mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); | |
732 | ||
733 | /* | |
734 | * During load, we set FirstUse if a new superblock was written. | |
735 | * There are two reasons we might not have a superblock: | |
736 | * 1) The array is brand new - in which case, all of the | |
737 | * devices must have their In_sync bit set. Also, | |
738 | * recovery_cp must be 0, unless forced. | |
739 | * 2) This is a new device being added to an old array | |
740 | * and the new device needs to be rebuilt - in which | |
741 | * case the In_sync bit will /not/ be set and | |
742 | * recovery_cp must be MaxSector. | |
743 | */ | |
744 | rdev_for_each(r, t, mddev) { | |
745 | if (!test_bit(In_sync, &r->flags)) { | |
746 | if (!test_bit(FirstUse, &r->flags)) | |
747 | DMERR("Superblock area of " | |
748 | "rebuild device %d should have been " | |
749 | "cleared.", r->raid_disk); | |
750 | set_bit(FirstUse, &r->flags); | |
751 | rebuilds++; | |
752 | } else if (test_bit(FirstUse, &r->flags)) | |
753 | new_devs++; | |
754 | } | |
755 | ||
756 | if (!rebuilds) { | |
757 | if (new_devs == mddev->raid_disks) { | |
758 | DMINFO("Superblocks created for new array"); | |
759 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); | |
760 | } else if (new_devs) { | |
761 | DMERR("New device injected " | |
762 | "into existing array without 'rebuild' " | |
763 | "parameter specified"); | |
764 | return -EINVAL; | |
765 | } | |
766 | } else if (new_devs) { | |
767 | DMERR("'rebuild' devices cannot be " | |
768 | "injected into an array with other first-time devices"); | |
769 | return -EINVAL; | |
770 | } else if (mddev->recovery_cp != MaxSector) { | |
771 | DMERR("'rebuild' specified while array is not in-sync"); | |
772 | return -EINVAL; | |
773 | } | |
774 | ||
775 | /* | |
776 | * Now we set the Faulty bit for those devices that are | |
777 | * recorded in the superblock as failed. | |
778 | */ | |
779 | rdev_for_each(r, t, mddev) { | |
780 | if (!r->sb_page) | |
781 | continue; | |
782 | sb2 = page_address(r->sb_page); | |
783 | sb2->failed_devices = 0; | |
784 | ||
785 | /* | |
786 | * Check for any device re-ordering. | |
787 | */ | |
788 | if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) { | |
789 | role = le32_to_cpu(sb2->array_position); | |
790 | if (role != r->raid_disk) { | |
791 | if (rs->raid_type->level != 1) { | |
792 | rs->ti->error = "Cannot change device " | |
793 | "positions in RAID array"; | |
794 | return -EINVAL; | |
795 | } | |
796 | DMINFO("RAID1 device #%d now at position #%d", | |
797 | role, r->raid_disk); | |
798 | } | |
799 | ||
800 | /* | |
801 | * Partial recovery is performed on | |
802 | * returning failed devices. | |
803 | */ | |
804 | if (failed_devices & (1 << role)) | |
805 | set_bit(Faulty, &r->flags); | |
806 | } | |
807 | } | |
808 | ||
809 | return 0; | |
810 | } | |
811 | ||
fd01b88c | 812 | static int super_validate(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
813 | { |
814 | struct dm_raid_superblock *sb = page_address(rdev->sb_page); | |
815 | ||
816 | /* | |
817 | * If mddev->events is not set, we know we have not yet initialized | |
818 | * the array. | |
819 | */ | |
820 | if (!mddev->events && super_init_validation(mddev, rdev)) | |
821 | return -EINVAL; | |
822 | ||
823 | mddev->bitmap_info.offset = 4096 >> 9; /* Enable bitmap creation */ | |
824 | rdev->mddev->bitmap_info.default_offset = 4096 >> 9; | |
825 | if (!test_bit(FirstUse, &rdev->flags)) { | |
826 | rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); | |
827 | if (rdev->recovery_offset != MaxSector) | |
828 | clear_bit(In_sync, &rdev->flags); | |
829 | } | |
830 | ||
831 | /* | |
832 | * If a device comes back, set it as not In_sync and no longer faulty. | |
833 | */ | |
834 | if (test_bit(Faulty, &rdev->flags)) { | |
835 | clear_bit(Faulty, &rdev->flags); | |
836 | clear_bit(In_sync, &rdev->flags); | |
837 | rdev->saved_raid_disk = rdev->raid_disk; | |
838 | rdev->recovery_offset = 0; | |
839 | } | |
840 | ||
841 | clear_bit(FirstUse, &rdev->flags); | |
842 | ||
843 | return 0; | |
844 | } | |
845 | ||
846 | /* | |
847 | * Analyse superblocks and select the freshest. | |
848 | */ | |
849 | static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) | |
850 | { | |
851 | int ret; | |
3cb03002 | 852 | struct md_rdev *rdev, *freshest, *tmp; |
fd01b88c | 853 | struct mddev *mddev = &rs->md; |
b12d437b JB |
854 | |
855 | freshest = NULL; | |
856 | rdev_for_each(rdev, tmp, mddev) { | |
857 | if (!rdev->meta_bdev) | |
858 | continue; | |
859 | ||
860 | ret = super_load(rdev, freshest); | |
861 | ||
862 | switch (ret) { | |
863 | case 1: | |
864 | freshest = rdev; | |
865 | break; | |
866 | case 0: | |
867 | break; | |
868 | default: | |
869 | ti->error = "Failed to load superblock"; | |
870 | return ret; | |
871 | } | |
872 | } | |
873 | ||
874 | if (!freshest) | |
875 | return 0; | |
876 | ||
877 | /* | |
878 | * Validation of the freshest device provides the source of | |
879 | * validation for the remaining devices. | |
880 | */ | |
881 | ti->error = "Unable to assemble array: Invalid superblocks"; | |
882 | if (super_validate(mddev, freshest)) | |
883 | return -EINVAL; | |
884 | ||
885 | rdev_for_each(rdev, tmp, mddev) | |
886 | if ((rdev != freshest) && super_validate(mddev, rdev)) | |
887 | return -EINVAL; | |
888 | ||
889 | return 0; | |
890 | } | |
891 | ||
9d09e663 N |
892 | /* |
893 | * Construct a RAID4/5/6 mapping: | |
894 | * Args: | |
895 | * <raid_type> <#raid_params> <raid_params> \ | |
896 | * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> } | |
897 | * | |
9d09e663 N |
898 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
899 | * details on possible <raid_params>. | |
900 | */ | |
901 | static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) | |
902 | { | |
903 | int ret; | |
904 | struct raid_type *rt; | |
905 | unsigned long num_raid_params, num_raid_devs; | |
906 | struct raid_set *rs = NULL; | |
907 | ||
908 | /* Must have at least <raid_type> <#raid_params> */ | |
909 | if (argc < 2) { | |
910 | ti->error = "Too few arguments"; | |
911 | return -EINVAL; | |
912 | } | |
913 | ||
914 | /* raid type */ | |
915 | rt = get_raid_type(argv[0]); | |
916 | if (!rt) { | |
917 | ti->error = "Unrecognised raid_type"; | |
918 | return -EINVAL; | |
919 | } | |
920 | argc--; | |
921 | argv++; | |
922 | ||
923 | /* number of RAID parameters */ | |
924 | if (strict_strtoul(argv[0], 10, &num_raid_params) < 0) { | |
925 | ti->error = "Cannot understand number of RAID parameters"; | |
926 | return -EINVAL; | |
927 | } | |
928 | argc--; | |
929 | argv++; | |
930 | ||
931 | /* Skip over RAID params for now and find out # of devices */ | |
932 | if (num_raid_params + 1 > argc) { | |
933 | ti->error = "Arguments do not agree with counts given"; | |
934 | return -EINVAL; | |
935 | } | |
936 | ||
937 | if ((strict_strtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || | |
938 | (num_raid_devs >= INT_MAX)) { | |
939 | ti->error = "Cannot understand number of raid devices"; | |
940 | return -EINVAL; | |
941 | } | |
942 | ||
943 | rs = context_alloc(ti, rt, (unsigned)num_raid_devs); | |
944 | if (IS_ERR(rs)) | |
945 | return PTR_ERR(rs); | |
946 | ||
947 | ret = parse_raid_params(rs, argv, (unsigned)num_raid_params); | |
948 | if (ret) | |
949 | goto bad; | |
950 | ||
951 | ret = -EINVAL; | |
952 | ||
953 | argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */ | |
954 | argv += num_raid_params + 1; | |
955 | ||
956 | if (argc != (num_raid_devs * 2)) { | |
957 | ti->error = "Supplied RAID devices does not match the count given"; | |
958 | goto bad; | |
959 | } | |
960 | ||
961 | ret = dev_parms(rs, argv); | |
962 | if (ret) | |
963 | goto bad; | |
964 | ||
b12d437b JB |
965 | rs->md.sync_super = super_sync; |
966 | ret = analyse_superblocks(ti, rs); | |
967 | if (ret) | |
968 | goto bad; | |
969 | ||
9d09e663 | 970 | INIT_WORK(&rs->md.event_work, do_table_event); |
9d09e663 N |
971 | ti->private = rs; |
972 | ||
973 | mutex_lock(&rs->md.reconfig_mutex); | |
974 | ret = md_run(&rs->md); | |
975 | rs->md.in_sync = 0; /* Assume already marked dirty */ | |
976 | mutex_unlock(&rs->md.reconfig_mutex); | |
977 | ||
978 | if (ret) { | |
979 | ti->error = "Fail to run raid array"; | |
980 | goto bad; | |
981 | } | |
982 | ||
983 | rs->callbacks.congested_fn = raid_is_congested; | |
9d09e663 N |
984 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
985 | ||
32737279 | 986 | mddev_suspend(&rs->md); |
9d09e663 N |
987 | return 0; |
988 | ||
989 | bad: | |
990 | context_free(rs); | |
991 | ||
992 | return ret; | |
993 | } | |
994 | ||
995 | static void raid_dtr(struct dm_target *ti) | |
996 | { | |
997 | struct raid_set *rs = ti->private; | |
998 | ||
999 | list_del_init(&rs->callbacks.list); | |
1000 | md_stop(&rs->md); | |
1001 | context_free(rs); | |
1002 | } | |
1003 | ||
1004 | static int raid_map(struct dm_target *ti, struct bio *bio, union map_info *map_context) | |
1005 | { | |
1006 | struct raid_set *rs = ti->private; | |
fd01b88c | 1007 | struct mddev *mddev = &rs->md; |
9d09e663 N |
1008 | |
1009 | mddev->pers->make_request(mddev, bio); | |
1010 | ||
1011 | return DM_MAPIO_SUBMITTED; | |
1012 | } | |
1013 | ||
1014 | static int raid_status(struct dm_target *ti, status_type_t type, | |
1015 | char *result, unsigned maxlen) | |
1016 | { | |
1017 | struct raid_set *rs = ti->private; | |
1018 | unsigned raid_param_cnt = 1; /* at least 1 for chunksize */ | |
1019 | unsigned sz = 0; | |
1020 | int i; | |
1021 | sector_t sync; | |
1022 | ||
1023 | switch (type) { | |
1024 | case STATUSTYPE_INFO: | |
1025 | DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks); | |
1026 | ||
1027 | for (i = 0; i < rs->md.raid_disks; i++) { | |
1028 | if (test_bit(Faulty, &rs->dev[i].rdev.flags)) | |
1029 | DMEMIT("D"); | |
1030 | else if (test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1031 | DMEMIT("A"); | |
1032 | else | |
1033 | DMEMIT("a"); | |
1034 | } | |
1035 | ||
1036 | if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery)) | |
1037 | sync = rs->md.curr_resync_completed; | |
1038 | else | |
1039 | sync = rs->md.recovery_cp; | |
1040 | ||
1041 | if (sync > rs->md.resync_max_sectors) | |
1042 | sync = rs->md.resync_max_sectors; | |
1043 | ||
1044 | DMEMIT(" %llu/%llu", | |
1045 | (unsigned long long) sync, | |
1046 | (unsigned long long) rs->md.resync_max_sectors); | |
1047 | ||
1048 | break; | |
1049 | case STATUSTYPE_TABLE: | |
1050 | /* The string you would use to construct this array */ | |
46bed2b5 | 1051 | for (i = 0; i < rs->md.raid_disks; i++) { |
13c87583 JB |
1052 | if ((rs->print_flags & DMPF_REBUILD) && |
1053 | rs->dev[i].data_dev && | |
9d09e663 | 1054 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
13c87583 | 1055 | raid_param_cnt += 2; /* for rebuilds */ |
46bed2b5 JB |
1056 | if (rs->dev[i].data_dev && |
1057 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1058 | raid_param_cnt += 2; | |
1059 | } | |
9d09e663 | 1060 | |
13c87583 | 1061 | raid_param_cnt += (hweight64(rs->print_flags & ~DMPF_REBUILD) * 2); |
9d09e663 N |
1062 | if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)) |
1063 | raid_param_cnt--; | |
1064 | ||
1065 | DMEMIT("%s %u %u", rs->raid_type->name, | |
1066 | raid_param_cnt, rs->md.chunk_sectors); | |
1067 | ||
1068 | if ((rs->print_flags & DMPF_SYNC) && | |
1069 | (rs->md.recovery_cp == MaxSector)) | |
1070 | DMEMIT(" sync"); | |
1071 | if (rs->print_flags & DMPF_NOSYNC) | |
1072 | DMEMIT(" nosync"); | |
1073 | ||
1074 | for (i = 0; i < rs->md.raid_disks; i++) | |
13c87583 JB |
1075 | if ((rs->print_flags & DMPF_REBUILD) && |
1076 | rs->dev[i].data_dev && | |
9d09e663 N |
1077 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
1078 | DMEMIT(" rebuild %u", i); | |
1079 | ||
1080 | if (rs->print_flags & DMPF_DAEMON_SLEEP) | |
1081 | DMEMIT(" daemon_sleep %lu", | |
1082 | rs->md.bitmap_info.daemon_sleep); | |
1083 | ||
1084 | if (rs->print_flags & DMPF_MIN_RECOVERY_RATE) | |
1085 | DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min); | |
1086 | ||
1087 | if (rs->print_flags & DMPF_MAX_RECOVERY_RATE) | |
1088 | DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max); | |
1089 | ||
46bed2b5 JB |
1090 | for (i = 0; i < rs->md.raid_disks; i++) |
1091 | if (rs->dev[i].data_dev && | |
1092 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1093 | DMEMIT(" write_mostly %u", i); | |
1094 | ||
9d09e663 N |
1095 | if (rs->print_flags & DMPF_MAX_WRITE_BEHIND) |
1096 | DMEMIT(" max_write_behind %lu", | |
1097 | rs->md.bitmap_info.max_write_behind); | |
1098 | ||
1099 | if (rs->print_flags & DMPF_STRIPE_CACHE) { | |
d1688a6d | 1100 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1101 | |
1102 | /* convert from kiB to sectors */ | |
1103 | DMEMIT(" stripe_cache %d", | |
1104 | conf ? conf->max_nr_stripes * 2 : 0); | |
1105 | } | |
1106 | ||
c1084561 JB |
1107 | if (rs->print_flags & DMPF_REGION_SIZE) |
1108 | DMEMIT(" region_size %lu", | |
1109 | rs->md.bitmap_info.chunksize >> 9); | |
1110 | ||
9d09e663 N |
1111 | DMEMIT(" %d", rs->md.raid_disks); |
1112 | for (i = 0; i < rs->md.raid_disks; i++) { | |
b12d437b JB |
1113 | if (rs->dev[i].meta_dev) |
1114 | DMEMIT(" %s", rs->dev[i].meta_dev->name); | |
1115 | else | |
1116 | DMEMIT(" -"); | |
9d09e663 N |
1117 | |
1118 | if (rs->dev[i].data_dev) | |
1119 | DMEMIT(" %s", rs->dev[i].data_dev->name); | |
1120 | else | |
1121 | DMEMIT(" -"); | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | static int raid_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) | |
1129 | { | |
1130 | struct raid_set *rs = ti->private; | |
1131 | unsigned i; | |
1132 | int ret = 0; | |
1133 | ||
1134 | for (i = 0; !ret && i < rs->md.raid_disks; i++) | |
1135 | if (rs->dev[i].data_dev) | |
1136 | ret = fn(ti, | |
1137 | rs->dev[i].data_dev, | |
1138 | 0, /* No offset on data devs */ | |
1139 | rs->md.dev_sectors, | |
1140 | data); | |
1141 | ||
1142 | return ret; | |
1143 | } | |
1144 | ||
1145 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) | |
1146 | { | |
1147 | struct raid_set *rs = ti->private; | |
1148 | unsigned chunk_size = rs->md.chunk_sectors << 9; | |
d1688a6d | 1149 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1150 | |
1151 | blk_limits_io_min(limits, chunk_size); | |
1152 | blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); | |
1153 | } | |
1154 | ||
1155 | static void raid_presuspend(struct dm_target *ti) | |
1156 | { | |
1157 | struct raid_set *rs = ti->private; | |
1158 | ||
1159 | md_stop_writes(&rs->md); | |
1160 | } | |
1161 | ||
1162 | static void raid_postsuspend(struct dm_target *ti) | |
1163 | { | |
1164 | struct raid_set *rs = ti->private; | |
1165 | ||
1166 | mddev_suspend(&rs->md); | |
1167 | } | |
1168 | ||
1169 | static void raid_resume(struct dm_target *ti) | |
1170 | { | |
1171 | struct raid_set *rs = ti->private; | |
1172 | ||
b12d437b | 1173 | bitmap_load(&rs->md); |
9d09e663 N |
1174 | mddev_resume(&rs->md); |
1175 | } | |
1176 | ||
1177 | static struct target_type raid_target = { | |
1178 | .name = "raid", | |
32737279 | 1179 | .version = {1, 1, 0}, |
9d09e663 N |
1180 | .module = THIS_MODULE, |
1181 | .ctr = raid_ctr, | |
1182 | .dtr = raid_dtr, | |
1183 | .map = raid_map, | |
1184 | .status = raid_status, | |
1185 | .iterate_devices = raid_iterate_devices, | |
1186 | .io_hints = raid_io_hints, | |
1187 | .presuspend = raid_presuspend, | |
1188 | .postsuspend = raid_postsuspend, | |
1189 | .resume = raid_resume, | |
1190 | }; | |
1191 | ||
1192 | static int __init dm_raid_init(void) | |
1193 | { | |
1194 | return dm_register_target(&raid_target); | |
1195 | } | |
1196 | ||
1197 | static void __exit dm_raid_exit(void) | |
1198 | { | |
1199 | dm_unregister_target(&raid_target); | |
1200 | } | |
1201 | ||
1202 | module_init(dm_raid_init); | |
1203 | module_exit(dm_raid_exit); | |
1204 | ||
1205 | MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); | |
1206 | MODULE_ALIAS("dm-raid4"); | |
1207 | MODULE_ALIAS("dm-raid5"); | |
1208 | MODULE_ALIAS("dm-raid6"); | |
1209 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); | |
1210 | MODULE_LICENSE("GPL"); |