Commit | Line | Data |
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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> | |
056075c7 | 9 | #include <linux/module.h> |
9d09e663 N |
10 | |
11 | #include "md.h" | |
32737279 | 12 | #include "raid1.h" |
9d09e663 | 13 | #include "raid5.h" |
9d09e663 N |
14 | #include "bitmap.h" |
15 | ||
3e8dbb7f AK |
16 | #include <linux/device-mapper.h> |
17 | ||
9d09e663 N |
18 | #define DM_MSG_PREFIX "raid" |
19 | ||
20 | /* | |
b12d437b JB |
21 | * The following flags are used by dm-raid.c to set up the array state. |
22 | * They must be cleared before md_run is called. | |
9d09e663 | 23 | */ |
b12d437b | 24 | #define FirstUse 10 /* rdev flag */ |
9d09e663 N |
25 | |
26 | struct raid_dev { | |
27 | /* | |
28 | * Two DM devices, one to hold metadata and one to hold the | |
29 | * actual data/parity. The reason for this is to not confuse | |
30 | * ti->len and give more flexibility in altering size and | |
31 | * characteristics. | |
32 | * | |
33 | * While it is possible for this device to be associated | |
34 | * with a different physical device than the data_dev, it | |
35 | * is intended for it to be the same. | |
36 | * |--------- Physical Device ---------| | |
37 | * |- meta_dev -|------ data_dev ------| | |
38 | */ | |
39 | struct dm_dev *meta_dev; | |
40 | struct dm_dev *data_dev; | |
3cb03002 | 41 | struct md_rdev rdev; |
9d09e663 N |
42 | }; |
43 | ||
44 | /* | |
45 | * Flags for rs->print_flags field. | |
46 | */ | |
13c87583 JB |
47 | #define DMPF_SYNC 0x1 |
48 | #define DMPF_NOSYNC 0x2 | |
49 | #define DMPF_REBUILD 0x4 | |
50 | #define DMPF_DAEMON_SLEEP 0x8 | |
51 | #define DMPF_MIN_RECOVERY_RATE 0x10 | |
52 | #define DMPF_MAX_RECOVERY_RATE 0x20 | |
53 | #define DMPF_MAX_WRITE_BEHIND 0x40 | |
54 | #define DMPF_STRIPE_CACHE 0x80 | |
c1084561 | 55 | #define DMPF_REGION_SIZE 0X100 |
9d09e663 N |
56 | struct raid_set { |
57 | struct dm_target *ti; | |
58 | ||
59 | uint64_t print_flags; | |
60 | ||
fd01b88c | 61 | struct mddev md; |
9d09e663 N |
62 | struct raid_type *raid_type; |
63 | struct dm_target_callbacks callbacks; | |
64 | ||
65 | struct raid_dev dev[0]; | |
66 | }; | |
67 | ||
68 | /* Supported raid types and properties. */ | |
69 | static struct raid_type { | |
70 | const char *name; /* RAID algorithm. */ | |
71 | const char *descr; /* Descriptor text for logging. */ | |
72 | const unsigned parity_devs; /* # of parity devices. */ | |
73 | const unsigned minimal_devs; /* minimal # of devices in set. */ | |
74 | const unsigned level; /* RAID level. */ | |
75 | const unsigned algorithm; /* RAID algorithm. */ | |
76 | } raid_types[] = { | |
32737279 | 77 | {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */}, |
9d09e663 N |
78 | {"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, |
79 | {"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC}, | |
80 | {"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC}, | |
81 | {"raid5_ls", "RAID5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, | |
82 | {"raid5_rs", "RAID5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, | |
83 | {"raid6_zr", "RAID6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART}, | |
84 | {"raid6_nr", "RAID6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART}, | |
85 | {"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE} | |
86 | }; | |
87 | ||
88 | static struct raid_type *get_raid_type(char *name) | |
89 | { | |
90 | int i; | |
91 | ||
92 | for (i = 0; i < ARRAY_SIZE(raid_types); i++) | |
93 | if (!strcmp(raid_types[i].name, name)) | |
94 | return &raid_types[i]; | |
95 | ||
96 | return NULL; | |
97 | } | |
98 | ||
99 | static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs) | |
100 | { | |
101 | unsigned i; | |
102 | struct raid_set *rs; | |
103 | sector_t sectors_per_dev; | |
104 | ||
105 | if (raid_devs <= raid_type->parity_devs) { | |
106 | ti->error = "Insufficient number of devices"; | |
107 | return ERR_PTR(-EINVAL); | |
108 | } | |
109 | ||
110 | sectors_per_dev = ti->len; | |
32737279 JB |
111 | if ((raid_type->level > 1) && |
112 | sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) { | |
9d09e663 N |
113 | ti->error = "Target length not divisible by number of data devices"; |
114 | return ERR_PTR(-EINVAL); | |
115 | } | |
116 | ||
117 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); | |
118 | if (!rs) { | |
119 | ti->error = "Cannot allocate raid context"; | |
120 | return ERR_PTR(-ENOMEM); | |
121 | } | |
122 | ||
123 | mddev_init(&rs->md); | |
124 | ||
125 | rs->ti = ti; | |
126 | rs->raid_type = raid_type; | |
127 | rs->md.raid_disks = raid_devs; | |
128 | rs->md.level = raid_type->level; | |
129 | rs->md.new_level = rs->md.level; | |
130 | rs->md.dev_sectors = sectors_per_dev; | |
131 | rs->md.layout = raid_type->algorithm; | |
132 | rs->md.new_layout = rs->md.layout; | |
133 | rs->md.delta_disks = 0; | |
134 | rs->md.recovery_cp = 0; | |
135 | ||
136 | for (i = 0; i < raid_devs; i++) | |
137 | md_rdev_init(&rs->dev[i].rdev); | |
138 | ||
139 | /* | |
140 | * Remaining items to be initialized by further RAID params: | |
141 | * rs->md.persistent | |
142 | * rs->md.external | |
143 | * rs->md.chunk_sectors | |
144 | * rs->md.new_chunk_sectors | |
145 | */ | |
146 | ||
147 | return rs; | |
148 | } | |
149 | ||
150 | static void context_free(struct raid_set *rs) | |
151 | { | |
152 | int i; | |
153 | ||
b12d437b JB |
154 | for (i = 0; i < rs->md.raid_disks; i++) { |
155 | if (rs->dev[i].meta_dev) | |
156 | dm_put_device(rs->ti, rs->dev[i].meta_dev); | |
157 | if (rs->dev[i].rdev.sb_page) | |
158 | put_page(rs->dev[i].rdev.sb_page); | |
159 | rs->dev[i].rdev.sb_page = NULL; | |
160 | rs->dev[i].rdev.sb_loaded = 0; | |
9d09e663 N |
161 | if (rs->dev[i].data_dev) |
162 | dm_put_device(rs->ti, rs->dev[i].data_dev); | |
b12d437b | 163 | } |
9d09e663 N |
164 | |
165 | kfree(rs); | |
166 | } | |
167 | ||
168 | /* | |
169 | * For every device we have two words | |
170 | * <meta_dev>: meta device name or '-' if missing | |
171 | * <data_dev>: data device name or '-' if missing | |
172 | * | |
b12d437b JB |
173 | * The following are permitted: |
174 | * - - | |
175 | * - <data_dev> | |
176 | * <meta_dev> <data_dev> | |
177 | * | |
178 | * The following is not allowed: | |
179 | * <meta_dev> - | |
180 | * | |
181 | * This code parses those words. If there is a failure, | |
182 | * the caller must use context_free to unwind the operations. | |
9d09e663 N |
183 | */ |
184 | static int dev_parms(struct raid_set *rs, char **argv) | |
185 | { | |
186 | int i; | |
187 | int rebuild = 0; | |
188 | int metadata_available = 0; | |
189 | int ret = 0; | |
190 | ||
191 | for (i = 0; i < rs->md.raid_disks; i++, argv += 2) { | |
192 | rs->dev[i].rdev.raid_disk = i; | |
193 | ||
194 | rs->dev[i].meta_dev = NULL; | |
195 | rs->dev[i].data_dev = NULL; | |
196 | ||
197 | /* | |
198 | * There are no offsets, since there is a separate device | |
199 | * for data and metadata. | |
200 | */ | |
201 | rs->dev[i].rdev.data_offset = 0; | |
202 | rs->dev[i].rdev.mddev = &rs->md; | |
203 | ||
204 | if (strcmp(argv[0], "-")) { | |
b12d437b JB |
205 | ret = dm_get_device(rs->ti, argv[0], |
206 | dm_table_get_mode(rs->ti->table), | |
207 | &rs->dev[i].meta_dev); | |
208 | rs->ti->error = "RAID metadata device lookup failure"; | |
209 | if (ret) | |
210 | return ret; | |
211 | ||
212 | rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); | |
213 | if (!rs->dev[i].rdev.sb_page) | |
214 | return -ENOMEM; | |
9d09e663 N |
215 | } |
216 | ||
217 | if (!strcmp(argv[1], "-")) { | |
218 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && | |
219 | (!rs->dev[i].rdev.recovery_offset)) { | |
220 | rs->ti->error = "Drive designated for rebuild not specified"; | |
221 | return -EINVAL; | |
222 | } | |
223 | ||
b12d437b JB |
224 | rs->ti->error = "No data device supplied with metadata device"; |
225 | if (rs->dev[i].meta_dev) | |
226 | return -EINVAL; | |
227 | ||
9d09e663 N |
228 | continue; |
229 | } | |
230 | ||
231 | ret = dm_get_device(rs->ti, argv[1], | |
232 | dm_table_get_mode(rs->ti->table), | |
233 | &rs->dev[i].data_dev); | |
234 | if (ret) { | |
235 | rs->ti->error = "RAID device lookup failure"; | |
236 | return ret; | |
237 | } | |
238 | ||
b12d437b JB |
239 | if (rs->dev[i].meta_dev) { |
240 | metadata_available = 1; | |
241 | rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; | |
242 | } | |
9d09e663 N |
243 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
244 | list_add(&rs->dev[i].rdev.same_set, &rs->md.disks); | |
245 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
246 | rebuild++; | |
247 | } | |
248 | ||
249 | if (metadata_available) { | |
250 | rs->md.external = 0; | |
251 | rs->md.persistent = 1; | |
252 | rs->md.major_version = 2; | |
253 | } else if (rebuild && !rs->md.recovery_cp) { | |
254 | /* | |
255 | * Without metadata, we will not be able to tell if the array | |
256 | * is in-sync or not - we must assume it is not. Therefore, | |
257 | * it is impossible to rebuild a drive. | |
258 | * | |
259 | * Even if there is metadata, the on-disk information may | |
260 | * indicate that the array is not in-sync and it will then | |
261 | * fail at that time. | |
262 | * | |
263 | * User could specify 'nosync' option if desperate. | |
264 | */ | |
265 | DMERR("Unable to rebuild drive while array is not in-sync"); | |
266 | rs->ti->error = "RAID device lookup failure"; | |
267 | return -EINVAL; | |
268 | } | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
c1084561 JB |
273 | /* |
274 | * validate_region_size | |
275 | * @rs | |
276 | * @region_size: region size in sectors. If 0, pick a size (4MiB default). | |
277 | * | |
278 | * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). | |
279 | * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. | |
280 | * | |
281 | * Returns: 0 on success, -EINVAL on failure. | |
282 | */ | |
283 | static int validate_region_size(struct raid_set *rs, unsigned long region_size) | |
284 | { | |
285 | unsigned long min_region_size = rs->ti->len / (1 << 21); | |
286 | ||
287 | if (!region_size) { | |
288 | /* | |
289 | * Choose a reasonable default. All figures in sectors. | |
290 | */ | |
291 | if (min_region_size > (1 << 13)) { | |
292 | DMINFO("Choosing default region size of %lu sectors", | |
293 | region_size); | |
294 | region_size = min_region_size; | |
295 | } else { | |
296 | DMINFO("Choosing default region size of 4MiB"); | |
297 | region_size = 1 << 13; /* sectors */ | |
298 | } | |
299 | } else { | |
300 | /* | |
301 | * Validate user-supplied value. | |
302 | */ | |
303 | if (region_size > rs->ti->len) { | |
304 | rs->ti->error = "Supplied region size is too large"; | |
305 | return -EINVAL; | |
306 | } | |
307 | ||
308 | if (region_size < min_region_size) { | |
309 | DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", | |
310 | region_size, min_region_size); | |
311 | rs->ti->error = "Supplied region size is too small"; | |
312 | return -EINVAL; | |
313 | } | |
314 | ||
315 | if (!is_power_of_2(region_size)) { | |
316 | rs->ti->error = "Region size is not a power of 2"; | |
317 | return -EINVAL; | |
318 | } | |
319 | ||
320 | if (region_size < rs->md.chunk_sectors) { | |
321 | rs->ti->error = "Region size is smaller than the chunk size"; | |
322 | return -EINVAL; | |
323 | } | |
324 | } | |
325 | ||
326 | /* | |
327 | * Convert sectors to bytes. | |
328 | */ | |
329 | rs->md.bitmap_info.chunksize = (region_size << 9); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
9d09e663 N |
334 | /* |
335 | * Possible arguments are... | |
9d09e663 N |
336 | * <chunk_size> [optional_args] |
337 | * | |
32737279 JB |
338 | * Argument definitions |
339 | * <chunk_size> The number of sectors per disk that | |
340 | * will form the "stripe" | |
341 | * [[no]sync] Force or prevent recovery of the | |
342 | * entire array | |
9d09e663 | 343 | * [rebuild <idx>] Rebuild the drive indicated by the index |
32737279 JB |
344 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
345 | * clear bits | |
9d09e663 N |
346 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
347 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization | |
46bed2b5 | 348 | * [write_mostly <idx>] Indicate a write mostly drive via index |
9d09e663 N |
349 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
350 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs | |
c1084561 | 351 | * [region_size <sectors>] Defines granularity of bitmap |
9d09e663 N |
352 | */ |
353 | static int parse_raid_params(struct raid_set *rs, char **argv, | |
354 | unsigned num_raid_params) | |
355 | { | |
356 | unsigned i, rebuild_cnt = 0; | |
c1084561 | 357 | unsigned long value, region_size = 0; |
9d09e663 N |
358 | char *key; |
359 | ||
360 | /* | |
361 | * First, parse the in-order required arguments | |
32737279 | 362 | * "chunk_size" is the only argument of this type. |
9d09e663 | 363 | */ |
32737279 | 364 | if ((strict_strtoul(argv[0], 10, &value) < 0)) { |
9d09e663 N |
365 | rs->ti->error = "Bad chunk size"; |
366 | return -EINVAL; | |
32737279 JB |
367 | } else if (rs->raid_type->level == 1) { |
368 | if (value) | |
369 | DMERR("Ignoring chunk size parameter for RAID 1"); | |
370 | value = 0; | |
371 | } else if (!is_power_of_2(value)) { | |
372 | rs->ti->error = "Chunk size must be a power of 2"; | |
373 | return -EINVAL; | |
374 | } else if (value < 8) { | |
375 | rs->ti->error = "Chunk size value is too small"; | |
376 | return -EINVAL; | |
9d09e663 N |
377 | } |
378 | ||
379 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; | |
380 | argv++; | |
381 | num_raid_params--; | |
382 | ||
383 | /* | |
b12d437b JB |
384 | * We set each individual device as In_sync with a completed |
385 | * 'recovery_offset'. If there has been a device failure or | |
386 | * replacement then one of the following cases applies: | |
387 | * | |
388 | * 1) User specifies 'rebuild'. | |
389 | * - Device is reset when param is read. | |
390 | * 2) A new device is supplied. | |
391 | * - No matching superblock found, resets device. | |
392 | * 3) Device failure was transient and returns on reload. | |
393 | * - Failure noticed, resets device for bitmap replay. | |
394 | * 4) Device hadn't completed recovery after previous failure. | |
395 | * - Superblock is read and overrides recovery_offset. | |
396 | * | |
397 | * What is found in the superblocks of the devices is always | |
398 | * authoritative, unless 'rebuild' or '[no]sync' was specified. | |
9d09e663 | 399 | */ |
b12d437b | 400 | for (i = 0; i < rs->md.raid_disks; i++) { |
9d09e663 | 401 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
b12d437b JB |
402 | rs->dev[i].rdev.recovery_offset = MaxSector; |
403 | } | |
9d09e663 | 404 | |
b12d437b JB |
405 | /* |
406 | * Second, parse the unordered optional arguments | |
407 | */ | |
9d09e663 | 408 | for (i = 0; i < num_raid_params; i++) { |
13c87583 | 409 | if (!strcasecmp(argv[i], "nosync")) { |
9d09e663 N |
410 | rs->md.recovery_cp = MaxSector; |
411 | rs->print_flags |= DMPF_NOSYNC; | |
9d09e663 N |
412 | continue; |
413 | } | |
13c87583 | 414 | if (!strcasecmp(argv[i], "sync")) { |
9d09e663 N |
415 | rs->md.recovery_cp = 0; |
416 | rs->print_flags |= DMPF_SYNC; | |
9d09e663 N |
417 | continue; |
418 | } | |
419 | ||
420 | /* The rest of the optional arguments come in key/value pairs */ | |
421 | if ((i + 1) >= num_raid_params) { | |
422 | rs->ti->error = "Wrong number of raid parameters given"; | |
423 | return -EINVAL; | |
424 | } | |
425 | ||
426 | key = argv[i++]; | |
427 | if (strict_strtoul(argv[i], 10, &value) < 0) { | |
428 | rs->ti->error = "Bad numerical argument given in raid params"; | |
429 | return -EINVAL; | |
430 | } | |
431 | ||
13c87583 | 432 | if (!strcasecmp(key, "rebuild")) { |
32737279 JB |
433 | rebuild_cnt++; |
434 | if (((rs->raid_type->level != 1) && | |
435 | (rebuild_cnt > rs->raid_type->parity_devs)) || | |
436 | ((rs->raid_type->level == 1) && | |
437 | (rebuild_cnt > (rs->md.raid_disks - 1)))) { | |
438 | rs->ti->error = "Too many rebuild devices specified for given RAID type"; | |
9d09e663 N |
439 | return -EINVAL; |
440 | } | |
441 | if (value > rs->md.raid_disks) { | |
442 | rs->ti->error = "Invalid rebuild index given"; | |
443 | return -EINVAL; | |
444 | } | |
445 | clear_bit(In_sync, &rs->dev[value].rdev.flags); | |
446 | rs->dev[value].rdev.recovery_offset = 0; | |
13c87583 | 447 | rs->print_flags |= DMPF_REBUILD; |
46bed2b5 JB |
448 | } else if (!strcasecmp(key, "write_mostly")) { |
449 | if (rs->raid_type->level != 1) { | |
450 | rs->ti->error = "write_mostly option is only valid for RAID1"; | |
451 | return -EINVAL; | |
452 | } | |
82324809 | 453 | if (value >= rs->md.raid_disks) { |
46bed2b5 JB |
454 | rs->ti->error = "Invalid write_mostly drive index given"; |
455 | return -EINVAL; | |
456 | } | |
457 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); | |
13c87583 | 458 | } else if (!strcasecmp(key, "max_write_behind")) { |
46bed2b5 JB |
459 | if (rs->raid_type->level != 1) { |
460 | rs->ti->error = "max_write_behind option is only valid for RAID1"; | |
461 | return -EINVAL; | |
462 | } | |
9d09e663 N |
463 | rs->print_flags |= DMPF_MAX_WRITE_BEHIND; |
464 | ||
465 | /* | |
466 | * In device-mapper, we specify things in sectors, but | |
467 | * MD records this value in kB | |
468 | */ | |
469 | value /= 2; | |
470 | if (value > COUNTER_MAX) { | |
471 | rs->ti->error = "Max write-behind limit out of range"; | |
472 | return -EINVAL; | |
473 | } | |
474 | rs->md.bitmap_info.max_write_behind = value; | |
13c87583 | 475 | } else if (!strcasecmp(key, "daemon_sleep")) { |
9d09e663 N |
476 | rs->print_flags |= DMPF_DAEMON_SLEEP; |
477 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) { | |
478 | rs->ti->error = "daemon sleep period out of range"; | |
479 | return -EINVAL; | |
480 | } | |
481 | rs->md.bitmap_info.daemon_sleep = value; | |
13c87583 | 482 | } else if (!strcasecmp(key, "stripe_cache")) { |
9d09e663 N |
483 | rs->print_flags |= DMPF_STRIPE_CACHE; |
484 | ||
485 | /* | |
486 | * In device-mapper, we specify things in sectors, but | |
487 | * MD records this value in kB | |
488 | */ | |
489 | value /= 2; | |
490 | ||
491 | if (rs->raid_type->level < 5) { | |
492 | rs->ti->error = "Inappropriate argument: stripe_cache"; | |
493 | return -EINVAL; | |
494 | } | |
495 | if (raid5_set_cache_size(&rs->md, (int)value)) { | |
496 | rs->ti->error = "Bad stripe_cache size"; | |
497 | return -EINVAL; | |
498 | } | |
13c87583 | 499 | } else if (!strcasecmp(key, "min_recovery_rate")) { |
9d09e663 N |
500 | rs->print_flags |= DMPF_MIN_RECOVERY_RATE; |
501 | if (value > INT_MAX) { | |
502 | rs->ti->error = "min_recovery_rate out of range"; | |
503 | return -EINVAL; | |
504 | } | |
505 | rs->md.sync_speed_min = (int)value; | |
13c87583 | 506 | } else if (!strcasecmp(key, "max_recovery_rate")) { |
9d09e663 N |
507 | rs->print_flags |= DMPF_MAX_RECOVERY_RATE; |
508 | if (value > INT_MAX) { | |
509 | rs->ti->error = "max_recovery_rate out of range"; | |
510 | return -EINVAL; | |
511 | } | |
512 | rs->md.sync_speed_max = (int)value; | |
c1084561 JB |
513 | } else if (!strcasecmp(key, "region_size")) { |
514 | rs->print_flags |= DMPF_REGION_SIZE; | |
515 | region_size = value; | |
9d09e663 N |
516 | } else { |
517 | DMERR("Unable to parse RAID parameter: %s", key); | |
518 | rs->ti->error = "Unable to parse RAID parameters"; | |
519 | return -EINVAL; | |
520 | } | |
521 | } | |
522 | ||
c1084561 JB |
523 | if (validate_region_size(rs, region_size)) |
524 | return -EINVAL; | |
525 | ||
526 | if (rs->md.chunk_sectors) | |
527 | rs->ti->split_io = rs->md.chunk_sectors; | |
528 | else | |
529 | rs->ti->split_io = region_size; | |
530 | ||
32737279 JB |
531 | if (rs->md.chunk_sectors) |
532 | rs->ti->split_io = rs->md.chunk_sectors; | |
533 | else | |
534 | rs->ti->split_io = region_size; | |
535 | ||
9d09e663 N |
536 | /* Assume there are no metadata devices until the drives are parsed */ |
537 | rs->md.persistent = 0; | |
538 | rs->md.external = 1; | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | static void do_table_event(struct work_struct *ws) | |
544 | { | |
545 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); | |
546 | ||
547 | dm_table_event(rs->ti->table); | |
548 | } | |
549 | ||
550 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) | |
551 | { | |
552 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); | |
553 | ||
32737279 JB |
554 | if (rs->raid_type->level == 1) |
555 | return md_raid1_congested(&rs->md, bits); | |
556 | ||
9d09e663 N |
557 | return md_raid5_congested(&rs->md, bits); |
558 | } | |
559 | ||
b12d437b JB |
560 | /* |
561 | * This structure is never routinely used by userspace, unlike md superblocks. | |
562 | * Devices with this superblock should only ever be accessed via device-mapper. | |
563 | */ | |
564 | #define DM_RAID_MAGIC 0x64526D44 | |
565 | struct dm_raid_superblock { | |
566 | __le32 magic; /* "DmRd" */ | |
567 | __le32 features; /* Used to indicate possible future changes */ | |
568 | ||
569 | __le32 num_devices; /* Number of devices in this array. (Max 64) */ | |
570 | __le32 array_position; /* The position of this drive in the array */ | |
571 | ||
572 | __le64 events; /* Incremented by md when superblock updated */ | |
573 | __le64 failed_devices; /* Bit field of devices to indicate failures */ | |
574 | ||
575 | /* | |
576 | * This offset tracks the progress of the repair or replacement of | |
577 | * an individual drive. | |
578 | */ | |
579 | __le64 disk_recovery_offset; | |
580 | ||
581 | /* | |
582 | * This offset tracks the progress of the initial array | |
583 | * synchronisation/parity calculation. | |
584 | */ | |
585 | __le64 array_resync_offset; | |
586 | ||
587 | /* | |
588 | * RAID characteristics | |
589 | */ | |
590 | __le32 level; | |
591 | __le32 layout; | |
592 | __le32 stripe_sectors; | |
593 | ||
594 | __u8 pad[452]; /* Round struct to 512 bytes. */ | |
595 | /* Always set to 0 when writing. */ | |
596 | } __packed; | |
597 | ||
3cb03002 | 598 | static int read_disk_sb(struct md_rdev *rdev, int size) |
b12d437b JB |
599 | { |
600 | BUG_ON(!rdev->sb_page); | |
601 | ||
602 | if (rdev->sb_loaded) | |
603 | return 0; | |
604 | ||
605 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) { | |
606 | DMERR("Failed to read device superblock"); | |
607 | return -EINVAL; | |
608 | } | |
609 | ||
610 | rdev->sb_loaded = 1; | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
fd01b88c | 615 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b | 616 | { |
3cb03002 | 617 | struct md_rdev *r, *t; |
b12d437b JB |
618 | uint64_t failed_devices; |
619 | struct dm_raid_superblock *sb; | |
620 | ||
621 | sb = page_address(rdev->sb_page); | |
622 | failed_devices = le64_to_cpu(sb->failed_devices); | |
623 | ||
624 | rdev_for_each(r, t, mddev) | |
625 | if ((r->raid_disk >= 0) && test_bit(Faulty, &r->flags)) | |
626 | failed_devices |= (1ULL << r->raid_disk); | |
627 | ||
628 | memset(sb, 0, sizeof(*sb)); | |
629 | ||
630 | sb->magic = cpu_to_le32(DM_RAID_MAGIC); | |
631 | sb->features = cpu_to_le32(0); /* No features yet */ | |
632 | ||
633 | sb->num_devices = cpu_to_le32(mddev->raid_disks); | |
634 | sb->array_position = cpu_to_le32(rdev->raid_disk); | |
635 | ||
636 | sb->events = cpu_to_le64(mddev->events); | |
637 | sb->failed_devices = cpu_to_le64(failed_devices); | |
638 | ||
639 | sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
640 | sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); | |
641 | ||
642 | sb->level = cpu_to_le32(mddev->level); | |
643 | sb->layout = cpu_to_le32(mddev->layout); | |
644 | sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); | |
645 | } | |
646 | ||
647 | /* | |
648 | * super_load | |
649 | * | |
650 | * This function creates a superblock if one is not found on the device | |
651 | * and will decide which superblock to use if there's a choice. | |
652 | * | |
653 | * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise | |
654 | */ | |
3cb03002 | 655 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
b12d437b JB |
656 | { |
657 | int ret; | |
658 | struct dm_raid_superblock *sb; | |
659 | struct dm_raid_superblock *refsb; | |
660 | uint64_t events_sb, events_refsb; | |
661 | ||
662 | rdev->sb_start = 0; | |
663 | rdev->sb_size = sizeof(*sb); | |
664 | ||
665 | ret = read_disk_sb(rdev, rdev->sb_size); | |
666 | if (ret) | |
667 | return ret; | |
668 | ||
669 | sb = page_address(rdev->sb_page); | |
670 | if (sb->magic != cpu_to_le32(DM_RAID_MAGIC)) { | |
671 | super_sync(rdev->mddev, rdev); | |
672 | ||
673 | set_bit(FirstUse, &rdev->flags); | |
674 | ||
675 | /* Force writing of superblocks to disk */ | |
676 | set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags); | |
677 | ||
678 | /* Any superblock is better than none, choose that if given */ | |
679 | return refdev ? 0 : 1; | |
680 | } | |
681 | ||
682 | if (!refdev) | |
683 | return 1; | |
684 | ||
685 | events_sb = le64_to_cpu(sb->events); | |
686 | ||
687 | refsb = page_address(refdev->sb_page); | |
688 | events_refsb = le64_to_cpu(refsb->events); | |
689 | ||
690 | return (events_sb > events_refsb) ? 1 : 0; | |
691 | } | |
692 | ||
fd01b88c | 693 | static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
694 | { |
695 | int role; | |
696 | struct raid_set *rs = container_of(mddev, struct raid_set, md); | |
697 | uint64_t events_sb; | |
698 | uint64_t failed_devices; | |
699 | struct dm_raid_superblock *sb; | |
700 | uint32_t new_devs = 0; | |
701 | uint32_t rebuilds = 0; | |
3cb03002 | 702 | struct md_rdev *r, *t; |
b12d437b JB |
703 | struct dm_raid_superblock *sb2; |
704 | ||
705 | sb = page_address(rdev->sb_page); | |
706 | events_sb = le64_to_cpu(sb->events); | |
707 | failed_devices = le64_to_cpu(sb->failed_devices); | |
708 | ||
709 | /* | |
710 | * Initialise to 1 if this is a new superblock. | |
711 | */ | |
712 | mddev->events = events_sb ? : 1; | |
713 | ||
714 | /* | |
715 | * Reshaping is not currently allowed | |
716 | */ | |
717 | if ((le32_to_cpu(sb->level) != mddev->level) || | |
718 | (le32_to_cpu(sb->layout) != mddev->layout) || | |
719 | (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors)) { | |
720 | DMERR("Reshaping arrays not yet supported."); | |
721 | return -EINVAL; | |
722 | } | |
723 | ||
724 | /* We can only change the number of devices in RAID1 right now */ | |
725 | if ((rs->raid_type->level != 1) && | |
726 | (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) { | |
727 | DMERR("Reshaping arrays not yet supported."); | |
728 | return -EINVAL; | |
729 | } | |
730 | ||
731 | if (!(rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC))) | |
732 | mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); | |
733 | ||
734 | /* | |
735 | * During load, we set FirstUse if a new superblock was written. | |
736 | * There are two reasons we might not have a superblock: | |
737 | * 1) The array is brand new - in which case, all of the | |
738 | * devices must have their In_sync bit set. Also, | |
739 | * recovery_cp must be 0, unless forced. | |
740 | * 2) This is a new device being added to an old array | |
741 | * and the new device needs to be rebuilt - in which | |
742 | * case the In_sync bit will /not/ be set and | |
743 | * recovery_cp must be MaxSector. | |
744 | */ | |
745 | rdev_for_each(r, t, mddev) { | |
746 | if (!test_bit(In_sync, &r->flags)) { | |
747 | if (!test_bit(FirstUse, &r->flags)) | |
748 | DMERR("Superblock area of " | |
749 | "rebuild device %d should have been " | |
750 | "cleared.", r->raid_disk); | |
751 | set_bit(FirstUse, &r->flags); | |
752 | rebuilds++; | |
753 | } else if (test_bit(FirstUse, &r->flags)) | |
754 | new_devs++; | |
755 | } | |
756 | ||
757 | if (!rebuilds) { | |
758 | if (new_devs == mddev->raid_disks) { | |
759 | DMINFO("Superblocks created for new array"); | |
760 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); | |
761 | } else if (new_devs) { | |
762 | DMERR("New device injected " | |
763 | "into existing array without 'rebuild' " | |
764 | "parameter specified"); | |
765 | return -EINVAL; | |
766 | } | |
767 | } else if (new_devs) { | |
768 | DMERR("'rebuild' devices cannot be " | |
769 | "injected into an array with other first-time devices"); | |
770 | return -EINVAL; | |
771 | } else if (mddev->recovery_cp != MaxSector) { | |
772 | DMERR("'rebuild' specified while array is not in-sync"); | |
773 | return -EINVAL; | |
774 | } | |
775 | ||
776 | /* | |
777 | * Now we set the Faulty bit for those devices that are | |
778 | * recorded in the superblock as failed. | |
779 | */ | |
780 | rdev_for_each(r, t, mddev) { | |
781 | if (!r->sb_page) | |
782 | continue; | |
783 | sb2 = page_address(r->sb_page); | |
784 | sb2->failed_devices = 0; | |
785 | ||
786 | /* | |
787 | * Check for any device re-ordering. | |
788 | */ | |
789 | if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) { | |
790 | role = le32_to_cpu(sb2->array_position); | |
791 | if (role != r->raid_disk) { | |
792 | if (rs->raid_type->level != 1) { | |
793 | rs->ti->error = "Cannot change device " | |
794 | "positions in RAID array"; | |
795 | return -EINVAL; | |
796 | } | |
797 | DMINFO("RAID1 device #%d now at position #%d", | |
798 | role, r->raid_disk); | |
799 | } | |
800 | ||
801 | /* | |
802 | * Partial recovery is performed on | |
803 | * returning failed devices. | |
804 | */ | |
805 | if (failed_devices & (1 << role)) | |
806 | set_bit(Faulty, &r->flags); | |
807 | } | |
808 | } | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
fd01b88c | 813 | static int super_validate(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b JB |
814 | { |
815 | struct dm_raid_superblock *sb = page_address(rdev->sb_page); | |
816 | ||
817 | /* | |
818 | * If mddev->events is not set, we know we have not yet initialized | |
819 | * the array. | |
820 | */ | |
821 | if (!mddev->events && super_init_validation(mddev, rdev)) | |
822 | return -EINVAL; | |
823 | ||
824 | mddev->bitmap_info.offset = 4096 >> 9; /* Enable bitmap creation */ | |
825 | rdev->mddev->bitmap_info.default_offset = 4096 >> 9; | |
826 | if (!test_bit(FirstUse, &rdev->flags)) { | |
827 | rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); | |
828 | if (rdev->recovery_offset != MaxSector) | |
829 | clear_bit(In_sync, &rdev->flags); | |
830 | } | |
831 | ||
832 | /* | |
833 | * If a device comes back, set it as not In_sync and no longer faulty. | |
834 | */ | |
835 | if (test_bit(Faulty, &rdev->flags)) { | |
836 | clear_bit(Faulty, &rdev->flags); | |
837 | clear_bit(In_sync, &rdev->flags); | |
838 | rdev->saved_raid_disk = rdev->raid_disk; | |
839 | rdev->recovery_offset = 0; | |
840 | } | |
841 | ||
842 | clear_bit(FirstUse, &rdev->flags); | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
847 | /* | |
848 | * Analyse superblocks and select the freshest. | |
849 | */ | |
850 | static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) | |
851 | { | |
852 | int ret; | |
3cb03002 | 853 | struct md_rdev *rdev, *freshest, *tmp; |
fd01b88c | 854 | struct mddev *mddev = &rs->md; |
b12d437b JB |
855 | |
856 | freshest = NULL; | |
857 | rdev_for_each(rdev, tmp, mddev) { | |
858 | if (!rdev->meta_bdev) | |
859 | continue; | |
860 | ||
861 | ret = super_load(rdev, freshest); | |
862 | ||
863 | switch (ret) { | |
864 | case 1: | |
865 | freshest = rdev; | |
866 | break; | |
867 | case 0: | |
868 | break; | |
869 | default: | |
870 | ti->error = "Failed to load superblock"; | |
871 | return ret; | |
872 | } | |
873 | } | |
874 | ||
875 | if (!freshest) | |
876 | return 0; | |
877 | ||
878 | /* | |
879 | * Validation of the freshest device provides the source of | |
880 | * validation for the remaining devices. | |
881 | */ | |
882 | ti->error = "Unable to assemble array: Invalid superblocks"; | |
883 | if (super_validate(mddev, freshest)) | |
884 | return -EINVAL; | |
885 | ||
886 | rdev_for_each(rdev, tmp, mddev) | |
887 | if ((rdev != freshest) && super_validate(mddev, rdev)) | |
888 | return -EINVAL; | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
9d09e663 N |
893 | /* |
894 | * Construct a RAID4/5/6 mapping: | |
895 | * Args: | |
896 | * <raid_type> <#raid_params> <raid_params> \ | |
897 | * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> } | |
898 | * | |
9d09e663 N |
899 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
900 | * details on possible <raid_params>. | |
901 | */ | |
902 | static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) | |
903 | { | |
904 | int ret; | |
905 | struct raid_type *rt; | |
906 | unsigned long num_raid_params, num_raid_devs; | |
907 | struct raid_set *rs = NULL; | |
908 | ||
909 | /* Must have at least <raid_type> <#raid_params> */ | |
910 | if (argc < 2) { | |
911 | ti->error = "Too few arguments"; | |
912 | return -EINVAL; | |
913 | } | |
914 | ||
915 | /* raid type */ | |
916 | rt = get_raid_type(argv[0]); | |
917 | if (!rt) { | |
918 | ti->error = "Unrecognised raid_type"; | |
919 | return -EINVAL; | |
920 | } | |
921 | argc--; | |
922 | argv++; | |
923 | ||
924 | /* number of RAID parameters */ | |
925 | if (strict_strtoul(argv[0], 10, &num_raid_params) < 0) { | |
926 | ti->error = "Cannot understand number of RAID parameters"; | |
927 | return -EINVAL; | |
928 | } | |
929 | argc--; | |
930 | argv++; | |
931 | ||
932 | /* Skip over RAID params for now and find out # of devices */ | |
933 | if (num_raid_params + 1 > argc) { | |
934 | ti->error = "Arguments do not agree with counts given"; | |
935 | return -EINVAL; | |
936 | } | |
937 | ||
938 | if ((strict_strtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) || | |
939 | (num_raid_devs >= INT_MAX)) { | |
940 | ti->error = "Cannot understand number of raid devices"; | |
941 | return -EINVAL; | |
942 | } | |
943 | ||
944 | rs = context_alloc(ti, rt, (unsigned)num_raid_devs); | |
945 | if (IS_ERR(rs)) | |
946 | return PTR_ERR(rs); | |
947 | ||
948 | ret = parse_raid_params(rs, argv, (unsigned)num_raid_params); | |
949 | if (ret) | |
950 | goto bad; | |
951 | ||
952 | ret = -EINVAL; | |
953 | ||
954 | argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */ | |
955 | argv += num_raid_params + 1; | |
956 | ||
957 | if (argc != (num_raid_devs * 2)) { | |
958 | ti->error = "Supplied RAID devices does not match the count given"; | |
959 | goto bad; | |
960 | } | |
961 | ||
962 | ret = dev_parms(rs, argv); | |
963 | if (ret) | |
964 | goto bad; | |
965 | ||
b12d437b JB |
966 | rs->md.sync_super = super_sync; |
967 | ret = analyse_superblocks(ti, rs); | |
968 | if (ret) | |
969 | goto bad; | |
970 | ||
9d09e663 | 971 | INIT_WORK(&rs->md.event_work, do_table_event); |
9d09e663 N |
972 | ti->private = rs; |
973 | ||
974 | mutex_lock(&rs->md.reconfig_mutex); | |
975 | ret = md_run(&rs->md); | |
976 | rs->md.in_sync = 0; /* Assume already marked dirty */ | |
977 | mutex_unlock(&rs->md.reconfig_mutex); | |
978 | ||
979 | if (ret) { | |
980 | ti->error = "Fail to run raid array"; | |
981 | goto bad; | |
982 | } | |
983 | ||
984 | rs->callbacks.congested_fn = raid_is_congested; | |
9d09e663 N |
985 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
986 | ||
32737279 | 987 | mddev_suspend(&rs->md); |
9d09e663 N |
988 | return 0; |
989 | ||
990 | bad: | |
991 | context_free(rs); | |
992 | ||
993 | return ret; | |
994 | } | |
995 | ||
996 | static void raid_dtr(struct dm_target *ti) | |
997 | { | |
998 | struct raid_set *rs = ti->private; | |
999 | ||
1000 | list_del_init(&rs->callbacks.list); | |
1001 | md_stop(&rs->md); | |
1002 | context_free(rs); | |
1003 | } | |
1004 | ||
1005 | static int raid_map(struct dm_target *ti, struct bio *bio, union map_info *map_context) | |
1006 | { | |
1007 | struct raid_set *rs = ti->private; | |
fd01b88c | 1008 | struct mddev *mddev = &rs->md; |
9d09e663 N |
1009 | |
1010 | mddev->pers->make_request(mddev, bio); | |
1011 | ||
1012 | return DM_MAPIO_SUBMITTED; | |
1013 | } | |
1014 | ||
1015 | static int raid_status(struct dm_target *ti, status_type_t type, | |
1016 | char *result, unsigned maxlen) | |
1017 | { | |
1018 | struct raid_set *rs = ti->private; | |
1019 | unsigned raid_param_cnt = 1; /* at least 1 for chunksize */ | |
1020 | unsigned sz = 0; | |
2e727c3c | 1021 | int i, array_in_sync = 0; |
9d09e663 N |
1022 | sector_t sync; |
1023 | ||
1024 | switch (type) { | |
1025 | case STATUSTYPE_INFO: | |
1026 | DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks); | |
1027 | ||
9d09e663 N |
1028 | if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery)) |
1029 | sync = rs->md.curr_resync_completed; | |
1030 | else | |
1031 | sync = rs->md.recovery_cp; | |
1032 | ||
2e727c3c JB |
1033 | if (sync >= rs->md.resync_max_sectors) { |
1034 | array_in_sync = 1; | |
9d09e663 | 1035 | sync = rs->md.resync_max_sectors; |
2e727c3c JB |
1036 | } else { |
1037 | /* | |
1038 | * The array may be doing an initial sync, or it may | |
1039 | * be rebuilding individual components. If all the | |
1040 | * devices are In_sync, then it is the array that is | |
1041 | * being initialized. | |
1042 | */ | |
1043 | for (i = 0; i < rs->md.raid_disks; i++) | |
1044 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1045 | array_in_sync = 1; | |
1046 | } | |
1047 | /* | |
1048 | * Status characters: | |
1049 | * 'D' = Dead/Failed device | |
1050 | * 'a' = Alive but not in-sync | |
1051 | * 'A' = Alive and in-sync | |
1052 | */ | |
1053 | for (i = 0; i < rs->md.raid_disks; i++) { | |
1054 | if (test_bit(Faulty, &rs->dev[i].rdev.flags)) | |
1055 | DMEMIT("D"); | |
1056 | else if (!array_in_sync || | |
1057 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) | |
1058 | DMEMIT("a"); | |
1059 | else | |
1060 | DMEMIT("A"); | |
1061 | } | |
9d09e663 | 1062 | |
2e727c3c JB |
1063 | /* |
1064 | * In-sync ratio: | |
1065 | * The in-sync ratio shows the progress of: | |
1066 | * - Initializing the array | |
1067 | * - Rebuilding a subset of devices of the array | |
1068 | * The user can distinguish between the two by referring | |
1069 | * to the status characters. | |
1070 | */ | |
9d09e663 N |
1071 | DMEMIT(" %llu/%llu", |
1072 | (unsigned long long) sync, | |
1073 | (unsigned long long) rs->md.resync_max_sectors); | |
1074 | ||
1075 | break; | |
1076 | case STATUSTYPE_TABLE: | |
1077 | /* The string you would use to construct this array */ | |
46bed2b5 | 1078 | for (i = 0; i < rs->md.raid_disks; i++) { |
13c87583 JB |
1079 | if ((rs->print_flags & DMPF_REBUILD) && |
1080 | rs->dev[i].data_dev && | |
9d09e663 | 1081 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
13c87583 | 1082 | raid_param_cnt += 2; /* for rebuilds */ |
46bed2b5 JB |
1083 | if (rs->dev[i].data_dev && |
1084 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1085 | raid_param_cnt += 2; | |
1086 | } | |
9d09e663 | 1087 | |
13c87583 | 1088 | raid_param_cnt += (hweight64(rs->print_flags & ~DMPF_REBUILD) * 2); |
9d09e663 N |
1089 | if (rs->print_flags & (DMPF_SYNC | DMPF_NOSYNC)) |
1090 | raid_param_cnt--; | |
1091 | ||
1092 | DMEMIT("%s %u %u", rs->raid_type->name, | |
1093 | raid_param_cnt, rs->md.chunk_sectors); | |
1094 | ||
1095 | if ((rs->print_flags & DMPF_SYNC) && | |
1096 | (rs->md.recovery_cp == MaxSector)) | |
1097 | DMEMIT(" sync"); | |
1098 | if (rs->print_flags & DMPF_NOSYNC) | |
1099 | DMEMIT(" nosync"); | |
1100 | ||
1101 | for (i = 0; i < rs->md.raid_disks; i++) | |
13c87583 JB |
1102 | if ((rs->print_flags & DMPF_REBUILD) && |
1103 | rs->dev[i].data_dev && | |
9d09e663 N |
1104 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) |
1105 | DMEMIT(" rebuild %u", i); | |
1106 | ||
1107 | if (rs->print_flags & DMPF_DAEMON_SLEEP) | |
1108 | DMEMIT(" daemon_sleep %lu", | |
1109 | rs->md.bitmap_info.daemon_sleep); | |
1110 | ||
1111 | if (rs->print_flags & DMPF_MIN_RECOVERY_RATE) | |
1112 | DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min); | |
1113 | ||
1114 | if (rs->print_flags & DMPF_MAX_RECOVERY_RATE) | |
1115 | DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max); | |
1116 | ||
46bed2b5 JB |
1117 | for (i = 0; i < rs->md.raid_disks; i++) |
1118 | if (rs->dev[i].data_dev && | |
1119 | test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
1120 | DMEMIT(" write_mostly %u", i); | |
1121 | ||
9d09e663 N |
1122 | if (rs->print_flags & DMPF_MAX_WRITE_BEHIND) |
1123 | DMEMIT(" max_write_behind %lu", | |
1124 | rs->md.bitmap_info.max_write_behind); | |
1125 | ||
1126 | if (rs->print_flags & DMPF_STRIPE_CACHE) { | |
d1688a6d | 1127 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1128 | |
1129 | /* convert from kiB to sectors */ | |
1130 | DMEMIT(" stripe_cache %d", | |
1131 | conf ? conf->max_nr_stripes * 2 : 0); | |
1132 | } | |
1133 | ||
c1084561 JB |
1134 | if (rs->print_flags & DMPF_REGION_SIZE) |
1135 | DMEMIT(" region_size %lu", | |
1136 | rs->md.bitmap_info.chunksize >> 9); | |
1137 | ||
9d09e663 N |
1138 | DMEMIT(" %d", rs->md.raid_disks); |
1139 | for (i = 0; i < rs->md.raid_disks; i++) { | |
b12d437b JB |
1140 | if (rs->dev[i].meta_dev) |
1141 | DMEMIT(" %s", rs->dev[i].meta_dev->name); | |
1142 | else | |
1143 | DMEMIT(" -"); | |
9d09e663 N |
1144 | |
1145 | if (rs->dev[i].data_dev) | |
1146 | DMEMIT(" %s", rs->dev[i].data_dev->name); | |
1147 | else | |
1148 | DMEMIT(" -"); | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | static int raid_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data) | |
1156 | { | |
1157 | struct raid_set *rs = ti->private; | |
1158 | unsigned i; | |
1159 | int ret = 0; | |
1160 | ||
1161 | for (i = 0; !ret && i < rs->md.raid_disks; i++) | |
1162 | if (rs->dev[i].data_dev) | |
1163 | ret = fn(ti, | |
1164 | rs->dev[i].data_dev, | |
1165 | 0, /* No offset on data devs */ | |
1166 | rs->md.dev_sectors, | |
1167 | data); | |
1168 | ||
1169 | return ret; | |
1170 | } | |
1171 | ||
1172 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) | |
1173 | { | |
1174 | struct raid_set *rs = ti->private; | |
1175 | unsigned chunk_size = rs->md.chunk_sectors << 9; | |
d1688a6d | 1176 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
1177 | |
1178 | blk_limits_io_min(limits, chunk_size); | |
1179 | blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); | |
1180 | } | |
1181 | ||
1182 | static void raid_presuspend(struct dm_target *ti) | |
1183 | { | |
1184 | struct raid_set *rs = ti->private; | |
1185 | ||
1186 | md_stop_writes(&rs->md); | |
1187 | } | |
1188 | ||
1189 | static void raid_postsuspend(struct dm_target *ti) | |
1190 | { | |
1191 | struct raid_set *rs = ti->private; | |
1192 | ||
1193 | mddev_suspend(&rs->md); | |
1194 | } | |
1195 | ||
1196 | static void raid_resume(struct dm_target *ti) | |
1197 | { | |
1198 | struct raid_set *rs = ti->private; | |
1199 | ||
b12d437b | 1200 | bitmap_load(&rs->md); |
9d09e663 N |
1201 | mddev_resume(&rs->md); |
1202 | } | |
1203 | ||
1204 | static struct target_type raid_target = { | |
1205 | .name = "raid", | |
32737279 | 1206 | .version = {1, 1, 0}, |
9d09e663 N |
1207 | .module = THIS_MODULE, |
1208 | .ctr = raid_ctr, | |
1209 | .dtr = raid_dtr, | |
1210 | .map = raid_map, | |
1211 | .status = raid_status, | |
1212 | .iterate_devices = raid_iterate_devices, | |
1213 | .io_hints = raid_io_hints, | |
1214 | .presuspend = raid_presuspend, | |
1215 | .postsuspend = raid_postsuspend, | |
1216 | .resume = raid_resume, | |
1217 | }; | |
1218 | ||
1219 | static int __init dm_raid_init(void) | |
1220 | { | |
1221 | return dm_register_target(&raid_target); | |
1222 | } | |
1223 | ||
1224 | static void __exit dm_raid_exit(void) | |
1225 | { | |
1226 | dm_unregister_target(&raid_target); | |
1227 | } | |
1228 | ||
1229 | module_init(dm_raid_init); | |
1230 | module_exit(dm_raid_exit); | |
1231 | ||
1232 | MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target"); | |
1233 | MODULE_ALIAS("dm-raid4"); | |
1234 | MODULE_ALIAS("dm-raid5"); | |
1235 | MODULE_ALIAS("dm-raid6"); | |
1236 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); | |
1237 | MODULE_LICENSE("GPL"); |