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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"
11#include "raid1.h"
12#include "raid5.h"
13#include "bitmap.h"
14
15#include <linux/device-mapper.h>
16
17#define DM_MSG_PREFIX "raid"
18
19/*
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.
22 */
23#define FirstUse 10 /* rdev flag */
24
25struct 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;
40 struct mdk_rdev_s rdev;
41};
42
43/*
44 * Flags for rs->print_flags field.
45 */
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
54#define DMPF_REGION_SIZE 0X100
55struct raid_set {
56 struct dm_target *ti;
57
58 uint64_t print_flags;
59
60 struct mddev_s md;
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. */
68static 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[] = {
76 {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */},
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
87static 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
98static 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;
110 if ((raid_type->level > 1) &&
111 sector_div(sectors_per_dev, (raid_devs - raid_type->parity_devs))) {
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
149static void context_free(struct raid_set *rs)
150{
151 int i;
152
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;
160 if (rs->dev[i].data_dev)
161 dm_put_device(rs->ti, rs->dev[i].data_dev);
162 }
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 *
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.
182 */
183static 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], "-")) {
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;
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
223 rs->ti->error = "No data device supplied with metadata device";
224 if (rs->dev[i].meta_dev)
225 return -EINVAL;
226
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
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 }
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
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 */
282static 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
333/*
334 * Possible arguments are...
335 * <chunk_size> [optional_args]
336 *
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
342 * [rebuild <idx>] Rebuild the drive indicated by the index
343 * [daemon_sleep <ms>] Time between bitmap daemon work to
344 * clear bits
345 * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
346 * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
347 * [write_mostly <idx>] Indicate a write mostly drive via index
348 * [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
349 * [stripe_cache <sectors>] Stripe cache size for higher RAIDs
350 * [region_size <sectors>] Defines granularity of bitmap
351 */
352static int parse_raid_params(struct raid_set *rs, char **argv,
353 unsigned num_raid_params)
354{
355 unsigned i, rebuild_cnt = 0;
356 unsigned long value, region_size = 0;
357 char *key;
358
359 /*
360 * First, parse the in-order required arguments
361 * "chunk_size" is the only argument of this type.
362 */
363 if ((strict_strtoul(argv[0], 10, &value) < 0)) {
364 rs->ti->error = "Bad chunk size";
365 return -EINVAL;
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;
376 }
377
378 rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
379 argv++;
380 num_raid_params--;
381
382 /*
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.
398 */
399 for (i = 0; i < rs->md.raid_disks; i++) {
400 set_bit(In_sync, &rs->dev[i].rdev.flags);
401 rs->dev[i].rdev.recovery_offset = MaxSector;
402 }
403
404 /*
405 * Second, parse the unordered optional arguments
406 */
407 for (i = 0; i < num_raid_params; i++) {
408 if (!strcasecmp(argv[i], "nosync")) {
409 rs->md.recovery_cp = MaxSector;
410 rs->print_flags |= DMPF_NOSYNC;
411 continue;
412 }
413 if (!strcasecmp(argv[i], "sync")) {
414 rs->md.recovery_cp = 0;
415 rs->print_flags |= DMPF_SYNC;
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
431 if (!strcasecmp(key, "rebuild")) {
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";
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;
446 rs->print_flags |= DMPF_REBUILD;
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 }
452 if (value >= rs->md.raid_disks) {
453 rs->ti->error = "Invalid write_mostly drive index given";
454 return -EINVAL;
455 }
456 set_bit(WriteMostly, &rs->dev[value].rdev.flags);
457 } else if (!strcasecmp(key, "max_write_behind")) {
458 if (rs->raid_type->level != 1) {
459 rs->ti->error = "max_write_behind option is only valid for RAID1";
460 return -EINVAL;
461 }
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;
474 } else if (!strcasecmp(key, "daemon_sleep")) {
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;
481 } else if (!strcasecmp(key, "stripe_cache")) {
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 }
498 } else if (!strcasecmp(key, "min_recovery_rate")) {
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;
505 } else if (!strcasecmp(key, "max_recovery_rate")) {
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;
512 } else if (!strcasecmp(key, "region_size")) {
513 rs->print_flags |= DMPF_REGION_SIZE;
514 region_size = value;
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
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
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
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
542static 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
549static 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
553 if (rs->raid_type->level == 1)
554 return md_raid1_congested(&rs->md, bits);
555
556 return md_raid5_congested(&rs->md, bits);
557}
558
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
564struct 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
597static int read_disk_sb(mdk_rdev_t *rdev, int size)
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
614static void super_sync(mddev_t *mddev, mdk_rdev_t *rdev)
615{
616 mdk_rdev_t *r, *t;
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 */
654static int super_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev)
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
692static int super_init_validation(mddev_t *mddev, mdk_rdev_t *rdev)
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;
701 mdk_rdev_t *r, *t;
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
812static int super_validate(mddev_t *mddev, mdk_rdev_t *rdev)
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 */
849static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
850{
851 int ret;
852 mdk_rdev_t *rdev, *freshest, *tmp;
853 mddev_t *mddev = &rs->md;
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
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 *
898 * <raid_params> varies by <raid_type>. See 'parse_raid_params' for
899 * details on possible <raid_params>.
900 */
901static 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
965 rs->md.sync_super = super_sync;
966 ret = analyse_superblocks(ti, rs);
967 if (ret)
968 goto bad;
969
970 INIT_WORK(&rs->md.event_work, do_table_event);
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;
984 dm_table_add_target_callbacks(ti->table, &rs->callbacks);
985
986 mddev_suspend(&rs->md);
987 return 0;
988
989bad:
990 context_free(rs);
991
992 return ret;
993}
994
995static 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
1004static int raid_map(struct dm_target *ti, struct bio *bio, union map_info *map_context)
1005{
1006 struct raid_set *rs = ti->private;
1007 mddev_t *mddev = &rs->md;
1008
1009 mddev->pers->make_request(mddev, bio);
1010
1011 return DM_MAPIO_SUBMITTED;
1012}
1013
1014static 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 */
1051 for (i = 0; i < rs->md.raid_disks; i++) {
1052 if ((rs->print_flags & DMPF_REBUILD) &&
1053 rs->dev[i].data_dev &&
1054 !test_bit(In_sync, &rs->dev[i].rdev.flags))
1055 raid_param_cnt += 2; /* for rebuilds */
1056 if (rs->dev[i].data_dev &&
1057 test_bit(WriteMostly, &rs->dev[i].rdev.flags))
1058 raid_param_cnt += 2;
1059 }
1060
1061 raid_param_cnt += (hweight64(rs->print_flags & ~DMPF_REBUILD) * 2);
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++)
1075 if ((rs->print_flags & DMPF_REBUILD) &&
1076 rs->dev[i].data_dev &&
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
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
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) {
1100 raid5_conf_t *conf = rs->md.private;
1101
1102 /* convert from kiB to sectors */
1103 DMEMIT(" stripe_cache %d",
1104 conf ? conf->max_nr_stripes * 2 : 0);
1105 }
1106
1107 if (rs->print_flags & DMPF_REGION_SIZE)
1108 DMEMIT(" region_size %lu",
1109 rs->md.bitmap_info.chunksize >> 9);
1110
1111 DMEMIT(" %d", rs->md.raid_disks);
1112 for (i = 0; i < rs->md.raid_disks; i++) {
1113 if (rs->dev[i].meta_dev)
1114 DMEMIT(" %s", rs->dev[i].meta_dev->name);
1115 else
1116 DMEMIT(" -");
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
1128static 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
1145static 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;
1149 raid5_conf_t *conf = rs->md.private;
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
1155static void raid_presuspend(struct dm_target *ti)
1156{
1157 struct raid_set *rs = ti->private;
1158
1159 md_stop_writes(&rs->md);
1160}
1161
1162static void raid_postsuspend(struct dm_target *ti)
1163{
1164 struct raid_set *rs = ti->private;
1165
1166 mddev_suspend(&rs->md);
1167}
1168
1169static void raid_resume(struct dm_target *ti)
1170{
1171 struct raid_set *rs = ti->private;
1172
1173 bitmap_load(&rs->md);
1174 mddev_resume(&rs->md);
1175}
1176
1177static struct target_type raid_target = {
1178 .name = "raid",
1179 .version = {1, 1, 0},
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
1192static int __init dm_raid_init(void)
1193{
1194 return dm_register_target(&raid_target);
1195}
1196
1197static void __exit dm_raid_exit(void)
1198{
1199 dm_unregister_target(&raid_target);
1200}
1201
1202module_init(dm_raid_init);
1203module_exit(dm_raid_exit);
1204
1205MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target");
1206MODULE_ALIAS("dm-raid4");
1207MODULE_ALIAS("dm-raid5");
1208MODULE_ALIAS("dm-raid6");
1209MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
1210MODULE_LICENSE("GPL");
1/*
2 * Copyright (C) 2010-2011 Neil Brown
3 * Copyright (C) 2010-2018 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include <linux/slab.h>
9#include <linux/module.h>
10
11#include "md.h"
12#include "raid1.h"
13#include "raid5.h"
14#include "raid10.h"
15#include "md-bitmap.h"
16
17#include <linux/device-mapper.h>
18
19#define DM_MSG_PREFIX "raid"
20#define MAX_RAID_DEVICES 253 /* md-raid kernel limit */
21
22/*
23 * Minimum sectors of free reshape space per raid device
24 */
25#define MIN_FREE_RESHAPE_SPACE to_sector(4*4096)
26
27/*
28 * Minimum journal space 4 MiB in sectors.
29 */
30#define MIN_RAID456_JOURNAL_SPACE (4*2048)
31
32static bool devices_handle_discard_safely = false;
33
34/*
35 * The following flags are used by dm-raid.c to set up the array state.
36 * They must be cleared before md_run is called.
37 */
38#define FirstUse 10 /* rdev flag */
39
40struct raid_dev {
41 /*
42 * Two DM devices, one to hold metadata and one to hold the
43 * actual data/parity. The reason for this is to not confuse
44 * ti->len and give more flexibility in altering size and
45 * characteristics.
46 *
47 * While it is possible for this device to be associated
48 * with a different physical device than the data_dev, it
49 * is intended for it to be the same.
50 * |--------- Physical Device ---------|
51 * |- meta_dev -|------ data_dev ------|
52 */
53 struct dm_dev *meta_dev;
54 struct dm_dev *data_dev;
55 struct md_rdev rdev;
56};
57
58/*
59 * Bits for establishing rs->ctr_flags
60 *
61 * 1 = no flag value
62 * 2 = flag with value
63 */
64#define __CTR_FLAG_SYNC 0 /* 1 */ /* Not with raid0! */
65#define __CTR_FLAG_NOSYNC 1 /* 1 */ /* Not with raid0! */
66#define __CTR_FLAG_REBUILD 2 /* 2 */ /* Not with raid0! */
67#define __CTR_FLAG_DAEMON_SLEEP 3 /* 2 */ /* Not with raid0! */
68#define __CTR_FLAG_MIN_RECOVERY_RATE 4 /* 2 */ /* Not with raid0! */
69#define __CTR_FLAG_MAX_RECOVERY_RATE 5 /* 2 */ /* Not with raid0! */
70#define __CTR_FLAG_MAX_WRITE_BEHIND 6 /* 2 */ /* Only with raid1! */
71#define __CTR_FLAG_WRITE_MOSTLY 7 /* 2 */ /* Only with raid1! */
72#define __CTR_FLAG_STRIPE_CACHE 8 /* 2 */ /* Only with raid4/5/6! */
73#define __CTR_FLAG_REGION_SIZE 9 /* 2 */ /* Not with raid0! */
74#define __CTR_FLAG_RAID10_COPIES 10 /* 2 */ /* Only with raid10 */
75#define __CTR_FLAG_RAID10_FORMAT 11 /* 2 */ /* Only with raid10 */
76/* New for v1.9.0 */
77#define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid1/4/5/6/10! */
78#define __CTR_FLAG_DATA_OFFSET 13 /* 2 */ /* Only with reshapable raid4/5/6/10! */
79#define __CTR_FLAG_RAID10_USE_NEAR_SETS 14 /* 2 */ /* Only with raid10! */
80
81/* New for v1.10.0 */
82#define __CTR_FLAG_JOURNAL_DEV 15 /* 2 */ /* Only with raid4/5/6 (journal device)! */
83
84/* New for v1.11.1 */
85#define __CTR_FLAG_JOURNAL_MODE 16 /* 2 */ /* Only with raid4/5/6 (journal mode)! */
86
87/*
88 * Flags for rs->ctr_flags field.
89 */
90#define CTR_FLAG_SYNC (1 << __CTR_FLAG_SYNC)
91#define CTR_FLAG_NOSYNC (1 << __CTR_FLAG_NOSYNC)
92#define CTR_FLAG_REBUILD (1 << __CTR_FLAG_REBUILD)
93#define CTR_FLAG_DAEMON_SLEEP (1 << __CTR_FLAG_DAEMON_SLEEP)
94#define CTR_FLAG_MIN_RECOVERY_RATE (1 << __CTR_FLAG_MIN_RECOVERY_RATE)
95#define CTR_FLAG_MAX_RECOVERY_RATE (1 << __CTR_FLAG_MAX_RECOVERY_RATE)
96#define CTR_FLAG_MAX_WRITE_BEHIND (1 << __CTR_FLAG_MAX_WRITE_BEHIND)
97#define CTR_FLAG_WRITE_MOSTLY (1 << __CTR_FLAG_WRITE_MOSTLY)
98#define CTR_FLAG_STRIPE_CACHE (1 << __CTR_FLAG_STRIPE_CACHE)
99#define CTR_FLAG_REGION_SIZE (1 << __CTR_FLAG_REGION_SIZE)
100#define CTR_FLAG_RAID10_COPIES (1 << __CTR_FLAG_RAID10_COPIES)
101#define CTR_FLAG_RAID10_FORMAT (1 << __CTR_FLAG_RAID10_FORMAT)
102#define CTR_FLAG_DELTA_DISKS (1 << __CTR_FLAG_DELTA_DISKS)
103#define CTR_FLAG_DATA_OFFSET (1 << __CTR_FLAG_DATA_OFFSET)
104#define CTR_FLAG_RAID10_USE_NEAR_SETS (1 << __CTR_FLAG_RAID10_USE_NEAR_SETS)
105#define CTR_FLAG_JOURNAL_DEV (1 << __CTR_FLAG_JOURNAL_DEV)
106#define CTR_FLAG_JOURNAL_MODE (1 << __CTR_FLAG_JOURNAL_MODE)
107
108/*
109 * Definitions of various constructor flags to
110 * be used in checks of valid / invalid flags
111 * per raid level.
112 */
113/* Define all any sync flags */
114#define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)
115
116/* Define flags for options without argument (e.g. 'nosync') */
117#define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \
118 CTR_FLAG_RAID10_USE_NEAR_SETS)
119
120/* Define flags for options with one argument (e.g. 'delta_disks +2') */
121#define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \
122 CTR_FLAG_WRITE_MOSTLY | \
123 CTR_FLAG_DAEMON_SLEEP | \
124 CTR_FLAG_MIN_RECOVERY_RATE | \
125 CTR_FLAG_MAX_RECOVERY_RATE | \
126 CTR_FLAG_MAX_WRITE_BEHIND | \
127 CTR_FLAG_STRIPE_CACHE | \
128 CTR_FLAG_REGION_SIZE | \
129 CTR_FLAG_RAID10_COPIES | \
130 CTR_FLAG_RAID10_FORMAT | \
131 CTR_FLAG_DELTA_DISKS | \
132 CTR_FLAG_DATA_OFFSET | \
133 CTR_FLAG_JOURNAL_DEV | \
134 CTR_FLAG_JOURNAL_MODE)
135
136/* Valid options definitions per raid level... */
137
138/* "raid0" does only accept data offset */
139#define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET)
140
141/* "raid1" does not accept stripe cache, data offset, delta_disks or any raid10 options */
142#define RAID1_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
143 CTR_FLAG_REBUILD | \
144 CTR_FLAG_WRITE_MOSTLY | \
145 CTR_FLAG_DAEMON_SLEEP | \
146 CTR_FLAG_MIN_RECOVERY_RATE | \
147 CTR_FLAG_MAX_RECOVERY_RATE | \
148 CTR_FLAG_MAX_WRITE_BEHIND | \
149 CTR_FLAG_REGION_SIZE | \
150 CTR_FLAG_DELTA_DISKS | \
151 CTR_FLAG_DATA_OFFSET)
152
153/* "raid10" does not accept any raid1 or stripe cache options */
154#define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
155 CTR_FLAG_REBUILD | \
156 CTR_FLAG_DAEMON_SLEEP | \
157 CTR_FLAG_MIN_RECOVERY_RATE | \
158 CTR_FLAG_MAX_RECOVERY_RATE | \
159 CTR_FLAG_REGION_SIZE | \
160 CTR_FLAG_RAID10_COPIES | \
161 CTR_FLAG_RAID10_FORMAT | \
162 CTR_FLAG_DELTA_DISKS | \
163 CTR_FLAG_DATA_OFFSET | \
164 CTR_FLAG_RAID10_USE_NEAR_SETS)
165
166/*
167 * "raid4/5/6" do not accept any raid1 or raid10 specific options
168 *
169 * "raid6" does not accept "nosync", because it is not guaranteed
170 * that both parity and q-syndrome are being written properly with
171 * any writes
172 */
173#define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
174 CTR_FLAG_REBUILD | \
175 CTR_FLAG_DAEMON_SLEEP | \
176 CTR_FLAG_MIN_RECOVERY_RATE | \
177 CTR_FLAG_MAX_RECOVERY_RATE | \
178 CTR_FLAG_STRIPE_CACHE | \
179 CTR_FLAG_REGION_SIZE | \
180 CTR_FLAG_DELTA_DISKS | \
181 CTR_FLAG_DATA_OFFSET | \
182 CTR_FLAG_JOURNAL_DEV | \
183 CTR_FLAG_JOURNAL_MODE)
184
185#define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \
186 CTR_FLAG_REBUILD | \
187 CTR_FLAG_DAEMON_SLEEP | \
188 CTR_FLAG_MIN_RECOVERY_RATE | \
189 CTR_FLAG_MAX_RECOVERY_RATE | \
190 CTR_FLAG_STRIPE_CACHE | \
191 CTR_FLAG_REGION_SIZE | \
192 CTR_FLAG_DELTA_DISKS | \
193 CTR_FLAG_DATA_OFFSET | \
194 CTR_FLAG_JOURNAL_DEV | \
195 CTR_FLAG_JOURNAL_MODE)
196/* ...valid options definitions per raid level */
197
198/*
199 * Flags for rs->runtime_flags field
200 * (RT_FLAG prefix meaning "runtime flag")
201 *
202 * These are all internal and used to define runtime state,
203 * e.g. to prevent another resume from preresume processing
204 * the raid set all over again.
205 */
206#define RT_FLAG_RS_PRERESUMED 0
207#define RT_FLAG_RS_RESUMED 1
208#define RT_FLAG_RS_BITMAP_LOADED 2
209#define RT_FLAG_UPDATE_SBS 3
210#define RT_FLAG_RESHAPE_RS 4
211#define RT_FLAG_RS_SUSPENDED 5
212#define RT_FLAG_RS_IN_SYNC 6
213#define RT_FLAG_RS_RESYNCING 7
214#define RT_FLAG_RS_GROW 8
215
216/* Array elements of 64 bit needed for rebuild/failed disk bits */
217#define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8)
218
219/*
220 * raid set level, layout and chunk sectors backup/restore
221 */
222struct rs_layout {
223 int new_level;
224 int new_layout;
225 int new_chunk_sectors;
226};
227
228struct raid_set {
229 struct dm_target *ti;
230
231 uint32_t stripe_cache_entries;
232 unsigned long ctr_flags;
233 unsigned long runtime_flags;
234
235 uint64_t rebuild_disks[DISKS_ARRAY_ELEMS];
236
237 int raid_disks;
238 int delta_disks;
239 int data_offset;
240 int raid10_copies;
241 int requested_bitmap_chunk_sectors;
242
243 struct mddev md;
244 struct raid_type *raid_type;
245
246 sector_t array_sectors;
247 sector_t dev_sectors;
248
249 /* Optional raid4/5/6 journal device */
250 struct journal_dev {
251 struct dm_dev *dev;
252 struct md_rdev rdev;
253 int mode;
254 } journal_dev;
255
256 struct raid_dev dev[];
257};
258
259static void rs_config_backup(struct raid_set *rs, struct rs_layout *l)
260{
261 struct mddev *mddev = &rs->md;
262
263 l->new_level = mddev->new_level;
264 l->new_layout = mddev->new_layout;
265 l->new_chunk_sectors = mddev->new_chunk_sectors;
266}
267
268static void rs_config_restore(struct raid_set *rs, struct rs_layout *l)
269{
270 struct mddev *mddev = &rs->md;
271
272 mddev->new_level = l->new_level;
273 mddev->new_layout = l->new_layout;
274 mddev->new_chunk_sectors = l->new_chunk_sectors;
275}
276
277/* raid10 algorithms (i.e. formats) */
278#define ALGORITHM_RAID10_DEFAULT 0
279#define ALGORITHM_RAID10_NEAR 1
280#define ALGORITHM_RAID10_OFFSET 2
281#define ALGORITHM_RAID10_FAR 3
282
283/* Supported raid types and properties. */
284static struct raid_type {
285 const char *name; /* RAID algorithm. */
286 const char *descr; /* Descriptor text for logging. */
287 const unsigned int parity_devs; /* # of parity devices. */
288 const unsigned int minimal_devs;/* minimal # of devices in set. */
289 const unsigned int level; /* RAID level. */
290 const unsigned int algorithm; /* RAID algorithm. */
291} raid_types[] = {
292 {"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */},
293 {"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */},
294 {"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR},
295 {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET},
296 {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR},
297 {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT},
298 {"raid4", "raid4 (dedicated first parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, /* raid4 layout = raid5_0 */
299 {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N},
300 {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
301 {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
302 {"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
303 {"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
304 {"raid6_zr", "raid6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART},
305 {"raid6_nr", "raid6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART},
306 {"raid6_nc", "raid6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE},
307 {"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6},
308 {"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6},
309 {"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6},
310 {"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6},
311 {"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6}
312};
313
314/* True, if @v is in inclusive range [@min, @max] */
315static bool __within_range(long v, long min, long max)
316{
317 return v >= min && v <= max;
318}
319
320/* All table line arguments are defined here */
321static struct arg_name_flag {
322 const unsigned long flag;
323 const char *name;
324} __arg_name_flags[] = {
325 { CTR_FLAG_SYNC, "sync"},
326 { CTR_FLAG_NOSYNC, "nosync"},
327 { CTR_FLAG_REBUILD, "rebuild"},
328 { CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"},
329 { CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"},
330 { CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"},
331 { CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"},
332 { CTR_FLAG_WRITE_MOSTLY, "write_mostly"},
333 { CTR_FLAG_STRIPE_CACHE, "stripe_cache"},
334 { CTR_FLAG_REGION_SIZE, "region_size"},
335 { CTR_FLAG_RAID10_COPIES, "raid10_copies"},
336 { CTR_FLAG_RAID10_FORMAT, "raid10_format"},
337 { CTR_FLAG_DATA_OFFSET, "data_offset"},
338 { CTR_FLAG_DELTA_DISKS, "delta_disks"},
339 { CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"},
340 { CTR_FLAG_JOURNAL_DEV, "journal_dev" },
341 { CTR_FLAG_JOURNAL_MODE, "journal_mode" },
342};
343
344/* Return argument name string for given @flag */
345static const char *dm_raid_arg_name_by_flag(const uint32_t flag)
346{
347 if (hweight32(flag) == 1) {
348 struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags);
349
350 while (anf-- > __arg_name_flags)
351 if (flag & anf->flag)
352 return anf->name;
353
354 } else
355 DMERR("%s called with more than one flag!", __func__);
356
357 return NULL;
358}
359
360/* Define correlation of raid456 journal cache modes and dm-raid target line parameters */
361static struct {
362 const int mode;
363 const char *param;
364} _raid456_journal_mode[] = {
365 { R5C_JOURNAL_MODE_WRITE_THROUGH , "writethrough" },
366 { R5C_JOURNAL_MODE_WRITE_BACK , "writeback" }
367};
368
369/* Return MD raid4/5/6 journal mode for dm @journal_mode one */
370static int dm_raid_journal_mode_to_md(const char *mode)
371{
372 int m = ARRAY_SIZE(_raid456_journal_mode);
373
374 while (m--)
375 if (!strcasecmp(mode, _raid456_journal_mode[m].param))
376 return _raid456_journal_mode[m].mode;
377
378 return -EINVAL;
379}
380
381/* Return dm-raid raid4/5/6 journal mode string for @mode */
382static const char *md_journal_mode_to_dm_raid(const int mode)
383{
384 int m = ARRAY_SIZE(_raid456_journal_mode);
385
386 while (m--)
387 if (mode == _raid456_journal_mode[m].mode)
388 return _raid456_journal_mode[m].param;
389
390 return "unknown";
391}
392
393/*
394 * Bool helpers to test for various raid levels of a raid set.
395 * It's level as reported by the superblock rather than
396 * the requested raid_type passed to the constructor.
397 */
398/* Return true, if raid set in @rs is raid0 */
399static bool rs_is_raid0(struct raid_set *rs)
400{
401 return !rs->md.level;
402}
403
404/* Return true, if raid set in @rs is raid1 */
405static bool rs_is_raid1(struct raid_set *rs)
406{
407 return rs->md.level == 1;
408}
409
410/* Return true, if raid set in @rs is raid10 */
411static bool rs_is_raid10(struct raid_set *rs)
412{
413 return rs->md.level == 10;
414}
415
416/* Return true, if raid set in @rs is level 6 */
417static bool rs_is_raid6(struct raid_set *rs)
418{
419 return rs->md.level == 6;
420}
421
422/* Return true, if raid set in @rs is level 4, 5 or 6 */
423static bool rs_is_raid456(struct raid_set *rs)
424{
425 return __within_range(rs->md.level, 4, 6);
426}
427
428/* Return true, if raid set in @rs is reshapable */
429static bool __is_raid10_far(int layout);
430static bool rs_is_reshapable(struct raid_set *rs)
431{
432 return rs_is_raid456(rs) ||
433 (rs_is_raid10(rs) && !__is_raid10_far(rs->md.new_layout));
434}
435
436/* Return true, if raid set in @rs is recovering */
437static bool rs_is_recovering(struct raid_set *rs)
438{
439 return rs->md.recovery_cp < rs->md.dev_sectors;
440}
441
442/* Return true, if raid set in @rs is reshaping */
443static bool rs_is_reshaping(struct raid_set *rs)
444{
445 return rs->md.reshape_position != MaxSector;
446}
447
448/*
449 * bool helpers to test for various raid levels of a raid type @rt
450 */
451
452/* Return true, if raid type in @rt is raid0 */
453static bool rt_is_raid0(struct raid_type *rt)
454{
455 return !rt->level;
456}
457
458/* Return true, if raid type in @rt is raid1 */
459static bool rt_is_raid1(struct raid_type *rt)
460{
461 return rt->level == 1;
462}
463
464/* Return true, if raid type in @rt is raid10 */
465static bool rt_is_raid10(struct raid_type *rt)
466{
467 return rt->level == 10;
468}
469
470/* Return true, if raid type in @rt is raid4/5 */
471static bool rt_is_raid45(struct raid_type *rt)
472{
473 return __within_range(rt->level, 4, 5);
474}
475
476/* Return true, if raid type in @rt is raid6 */
477static bool rt_is_raid6(struct raid_type *rt)
478{
479 return rt->level == 6;
480}
481
482/* Return true, if raid type in @rt is raid4/5/6 */
483static bool rt_is_raid456(struct raid_type *rt)
484{
485 return __within_range(rt->level, 4, 6);
486}
487/* END: raid level bools */
488
489/* Return valid ctr flags for the raid level of @rs */
490static unsigned long __valid_flags(struct raid_set *rs)
491{
492 if (rt_is_raid0(rs->raid_type))
493 return RAID0_VALID_FLAGS;
494 else if (rt_is_raid1(rs->raid_type))
495 return RAID1_VALID_FLAGS;
496 else if (rt_is_raid10(rs->raid_type))
497 return RAID10_VALID_FLAGS;
498 else if (rt_is_raid45(rs->raid_type))
499 return RAID45_VALID_FLAGS;
500 else if (rt_is_raid6(rs->raid_type))
501 return RAID6_VALID_FLAGS;
502
503 return 0;
504}
505
506/*
507 * Check for valid flags set on @rs
508 *
509 * Has to be called after parsing of the ctr flags!
510 */
511static int rs_check_for_valid_flags(struct raid_set *rs)
512{
513 if (rs->ctr_flags & ~__valid_flags(rs)) {
514 rs->ti->error = "Invalid flags combination";
515 return -EINVAL;
516 }
517
518 return 0;
519}
520
521/* MD raid10 bit definitions and helpers */
522#define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */
523#define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */
524#define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */
525#define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */
526
527/* Return md raid10 near copies for @layout */
528static unsigned int __raid10_near_copies(int layout)
529{
530 return layout & 0xFF;
531}
532
533/* Return md raid10 far copies for @layout */
534static unsigned int __raid10_far_copies(int layout)
535{
536 return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);
537}
538
539/* Return true if md raid10 offset for @layout */
540static bool __is_raid10_offset(int layout)
541{
542 return !!(layout & RAID10_OFFSET);
543}
544
545/* Return true if md raid10 near for @layout */
546static bool __is_raid10_near(int layout)
547{
548 return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1;
549}
550
551/* Return true if md raid10 far for @layout */
552static bool __is_raid10_far(int layout)
553{
554 return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1;
555}
556
557/* Return md raid10 layout string for @layout */
558static const char *raid10_md_layout_to_format(int layout)
559{
560 /*
561 * Bit 16 stands for "offset"
562 * (i.e. adjacent stripes hold copies)
563 *
564 * Refer to MD's raid10.c for details
565 */
566 if (__is_raid10_offset(layout))
567 return "offset";
568
569 if (__raid10_near_copies(layout) > 1)
570 return "near";
571
572 if (__raid10_far_copies(layout) > 1)
573 return "far";
574
575 return "unknown";
576}
577
578/* Return md raid10 algorithm for @name */
579static int raid10_name_to_format(const char *name)
580{
581 if (!strcasecmp(name, "near"))
582 return ALGORITHM_RAID10_NEAR;
583 else if (!strcasecmp(name, "offset"))
584 return ALGORITHM_RAID10_OFFSET;
585 else if (!strcasecmp(name, "far"))
586 return ALGORITHM_RAID10_FAR;
587
588 return -EINVAL;
589}
590
591/* Return md raid10 copies for @layout */
592static unsigned int raid10_md_layout_to_copies(int layout)
593{
594 return max(__raid10_near_copies(layout), __raid10_far_copies(layout));
595}
596
597/* Return md raid10 format id for @format string */
598static int raid10_format_to_md_layout(struct raid_set *rs,
599 unsigned int algorithm,
600 unsigned int copies)
601{
602 unsigned int n = 1, f = 1, r = 0;
603
604 /*
605 * MD resilienece flaw:
606 *
607 * enabling use_far_sets for far/offset formats causes copies
608 * to be colocated on the same devs together with their origins!
609 *
610 * -> disable it for now in the definition above
611 */
612 if (algorithm == ALGORITHM_RAID10_DEFAULT ||
613 algorithm == ALGORITHM_RAID10_NEAR)
614 n = copies;
615
616 else if (algorithm == ALGORITHM_RAID10_OFFSET) {
617 f = copies;
618 r = RAID10_OFFSET;
619 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
620 r |= RAID10_USE_FAR_SETS;
621
622 } else if (algorithm == ALGORITHM_RAID10_FAR) {
623 f = copies;
624 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
625 r |= RAID10_USE_FAR_SETS;
626
627 } else
628 return -EINVAL;
629
630 return r | (f << RAID10_FAR_COPIES_SHIFT) | n;
631}
632/* END: MD raid10 bit definitions and helpers */
633
634/* Check for any of the raid10 algorithms */
635static bool __got_raid10(struct raid_type *rtp, const int layout)
636{
637 if (rtp->level == 10) {
638 switch (rtp->algorithm) {
639 case ALGORITHM_RAID10_DEFAULT:
640 case ALGORITHM_RAID10_NEAR:
641 return __is_raid10_near(layout);
642 case ALGORITHM_RAID10_OFFSET:
643 return __is_raid10_offset(layout);
644 case ALGORITHM_RAID10_FAR:
645 return __is_raid10_far(layout);
646 default:
647 break;
648 }
649 }
650
651 return false;
652}
653
654/* Return raid_type for @name */
655static struct raid_type *get_raid_type(const char *name)
656{
657 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
658
659 while (rtp-- > raid_types)
660 if (!strcasecmp(rtp->name, name))
661 return rtp;
662
663 return NULL;
664}
665
666/* Return raid_type for @name based derived from @level and @layout */
667static struct raid_type *get_raid_type_by_ll(const int level, const int layout)
668{
669 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
670
671 while (rtp-- > raid_types) {
672 /* RAID10 special checks based on @layout flags/properties */
673 if (rtp->level == level &&
674 (__got_raid10(rtp, layout) || rtp->algorithm == layout))
675 return rtp;
676 }
677
678 return NULL;
679}
680
681/* Adjust rdev sectors */
682static void rs_set_rdev_sectors(struct raid_set *rs)
683{
684 struct mddev *mddev = &rs->md;
685 struct md_rdev *rdev;
686
687 /*
688 * raid10 sets rdev->sector to the device size, which
689 * is unintended in case of out-of-place reshaping
690 */
691 rdev_for_each(rdev, mddev)
692 if (!test_bit(Journal, &rdev->flags))
693 rdev->sectors = mddev->dev_sectors;
694}
695
696/*
697 * Change bdev capacity of @rs in case of a disk add/remove reshape
698 */
699static void rs_set_capacity(struct raid_set *rs)
700{
701 struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table));
702
703 set_capacity_and_notify(gendisk, rs->md.array_sectors);
704}
705
706/*
707 * Set the mddev properties in @rs to the current
708 * ones retrieved from the freshest superblock
709 */
710static void rs_set_cur(struct raid_set *rs)
711{
712 struct mddev *mddev = &rs->md;
713
714 mddev->new_level = mddev->level;
715 mddev->new_layout = mddev->layout;
716 mddev->new_chunk_sectors = mddev->chunk_sectors;
717}
718
719/*
720 * Set the mddev properties in @rs to the new
721 * ones requested by the ctr
722 */
723static void rs_set_new(struct raid_set *rs)
724{
725 struct mddev *mddev = &rs->md;
726
727 mddev->level = mddev->new_level;
728 mddev->layout = mddev->new_layout;
729 mddev->chunk_sectors = mddev->new_chunk_sectors;
730 mddev->raid_disks = rs->raid_disks;
731 mddev->delta_disks = 0;
732}
733
734static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *raid_type,
735 unsigned int raid_devs)
736{
737 unsigned int i;
738 struct raid_set *rs;
739
740 if (raid_devs <= raid_type->parity_devs) {
741 ti->error = "Insufficient number of devices";
742 return ERR_PTR(-EINVAL);
743 }
744
745 rs = kzalloc(struct_size(rs, dev, raid_devs), GFP_KERNEL);
746 if (!rs) {
747 ti->error = "Cannot allocate raid context";
748 return ERR_PTR(-ENOMEM);
749 }
750
751 mddev_init(&rs->md);
752
753 rs->raid_disks = raid_devs;
754 rs->delta_disks = 0;
755
756 rs->ti = ti;
757 rs->raid_type = raid_type;
758 rs->stripe_cache_entries = 256;
759 rs->md.raid_disks = raid_devs;
760 rs->md.level = raid_type->level;
761 rs->md.new_level = rs->md.level;
762 rs->md.layout = raid_type->algorithm;
763 rs->md.new_layout = rs->md.layout;
764 rs->md.delta_disks = 0;
765 rs->md.recovery_cp = MaxSector;
766
767 for (i = 0; i < raid_devs; i++)
768 md_rdev_init(&rs->dev[i].rdev);
769
770 /*
771 * Remaining items to be initialized by further RAID params:
772 * rs->md.persistent
773 * rs->md.external
774 * rs->md.chunk_sectors
775 * rs->md.new_chunk_sectors
776 * rs->md.dev_sectors
777 */
778
779 return rs;
780}
781
782/* Free all @rs allocations */
783static void raid_set_free(struct raid_set *rs)
784{
785 int i;
786
787 if (rs->journal_dev.dev) {
788 md_rdev_clear(&rs->journal_dev.rdev);
789 dm_put_device(rs->ti, rs->journal_dev.dev);
790 }
791
792 for (i = 0; i < rs->raid_disks; i++) {
793 if (rs->dev[i].meta_dev)
794 dm_put_device(rs->ti, rs->dev[i].meta_dev);
795 md_rdev_clear(&rs->dev[i].rdev);
796 if (rs->dev[i].data_dev)
797 dm_put_device(rs->ti, rs->dev[i].data_dev);
798 }
799
800 kfree(rs);
801}
802
803/*
804 * For every device we have two words
805 * <meta_dev>: meta device name or '-' if missing
806 * <data_dev>: data device name or '-' if missing
807 *
808 * The following are permitted:
809 * - -
810 * - <data_dev>
811 * <meta_dev> <data_dev>
812 *
813 * The following is not allowed:
814 * <meta_dev> -
815 *
816 * This code parses those words. If there is a failure,
817 * the caller must use raid_set_free() to unwind the operations.
818 */
819static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as)
820{
821 int i;
822 int rebuild = 0;
823 int metadata_available = 0;
824 int r = 0;
825 const char *arg;
826
827 /* Put off the number of raid devices argument to get to dev pairs */
828 arg = dm_shift_arg(as);
829 if (!arg)
830 return -EINVAL;
831
832 for (i = 0; i < rs->raid_disks; i++) {
833 rs->dev[i].rdev.raid_disk = i;
834
835 rs->dev[i].meta_dev = NULL;
836 rs->dev[i].data_dev = NULL;
837
838 /*
839 * There are no offsets initially.
840 * Out of place reshape will set them accordingly.
841 */
842 rs->dev[i].rdev.data_offset = 0;
843 rs->dev[i].rdev.new_data_offset = 0;
844 rs->dev[i].rdev.mddev = &rs->md;
845
846 arg = dm_shift_arg(as);
847 if (!arg)
848 return -EINVAL;
849
850 if (strcmp(arg, "-")) {
851 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
852 &rs->dev[i].meta_dev);
853 if (r) {
854 rs->ti->error = "RAID metadata device lookup failure";
855 return r;
856 }
857
858 rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
859 if (!rs->dev[i].rdev.sb_page) {
860 rs->ti->error = "Failed to allocate superblock page";
861 return -ENOMEM;
862 }
863 }
864
865 arg = dm_shift_arg(as);
866 if (!arg)
867 return -EINVAL;
868
869 if (!strcmp(arg, "-")) {
870 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
871 (!rs->dev[i].rdev.recovery_offset)) {
872 rs->ti->error = "Drive designated for rebuild not specified";
873 return -EINVAL;
874 }
875
876 if (rs->dev[i].meta_dev) {
877 rs->ti->error = "No data device supplied with metadata device";
878 return -EINVAL;
879 }
880
881 continue;
882 }
883
884 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
885 &rs->dev[i].data_dev);
886 if (r) {
887 rs->ti->error = "RAID device lookup failure";
888 return r;
889 }
890
891 if (rs->dev[i].meta_dev) {
892 metadata_available = 1;
893 rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
894 }
895 rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
896 list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks);
897 if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
898 rebuild++;
899 }
900
901 if (rs->journal_dev.dev)
902 list_add_tail(&rs->journal_dev.rdev.same_set, &rs->md.disks);
903
904 if (metadata_available) {
905 rs->md.external = 0;
906 rs->md.persistent = 1;
907 rs->md.major_version = 2;
908 } else if (rebuild && !rs->md.recovery_cp) {
909 /*
910 * Without metadata, we will not be able to tell if the array
911 * is in-sync or not - we must assume it is not. Therefore,
912 * it is impossible to rebuild a drive.
913 *
914 * Even if there is metadata, the on-disk information may
915 * indicate that the array is not in-sync and it will then
916 * fail at that time.
917 *
918 * User could specify 'nosync' option if desperate.
919 */
920 rs->ti->error = "Unable to rebuild drive while array is not in-sync";
921 return -EINVAL;
922 }
923
924 return 0;
925}
926
927/*
928 * validate_region_size
929 * @rs
930 * @region_size: region size in sectors. If 0, pick a size (4MiB default).
931 *
932 * Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
933 * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
934 *
935 * Returns: 0 on success, -EINVAL on failure.
936 */
937static int validate_region_size(struct raid_set *rs, unsigned long region_size)
938{
939 unsigned long min_region_size = rs->ti->len / (1 << 21);
940
941 if (rs_is_raid0(rs))
942 return 0;
943
944 if (!region_size) {
945 /*
946 * Choose a reasonable default. All figures in sectors.
947 */
948 if (min_region_size > (1 << 13)) {
949 /* If not a power of 2, make it the next power of 2 */
950 region_size = roundup_pow_of_two(min_region_size);
951 DMINFO("Choosing default region size of %lu sectors",
952 region_size);
953 } else {
954 DMINFO("Choosing default region size of 4MiB");
955 region_size = 1 << 13; /* sectors */
956 }
957 } else {
958 /*
959 * Validate user-supplied value.
960 */
961 if (region_size > rs->ti->len) {
962 rs->ti->error = "Supplied region size is too large";
963 return -EINVAL;
964 }
965
966 if (region_size < min_region_size) {
967 DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
968 region_size, min_region_size);
969 rs->ti->error = "Supplied region size is too small";
970 return -EINVAL;
971 }
972
973 if (!is_power_of_2(region_size)) {
974 rs->ti->error = "Region size is not a power of 2";
975 return -EINVAL;
976 }
977
978 if (region_size < rs->md.chunk_sectors) {
979 rs->ti->error = "Region size is smaller than the chunk size";
980 return -EINVAL;
981 }
982 }
983
984 /*
985 * Convert sectors to bytes.
986 */
987 rs->md.bitmap_info.chunksize = to_bytes(region_size);
988
989 return 0;
990}
991
992/*
993 * validate_raid_redundancy
994 * @rs
995 *
996 * Determine if there are enough devices in the array that haven't
997 * failed (or are being rebuilt) to form a usable array.
998 *
999 * Returns: 0 on success, -EINVAL on failure.
1000 */
1001static int validate_raid_redundancy(struct raid_set *rs)
1002{
1003 unsigned int i, rebuild_cnt = 0;
1004 unsigned int rebuilds_per_group = 0, copies;
1005 unsigned int group_size, last_group_start;
1006
1007 for (i = 0; i < rs->md.raid_disks; i++)
1008 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) ||
1009 !rs->dev[i].rdev.sb_page)
1010 rebuild_cnt++;
1011
1012 switch (rs->md.level) {
1013 case 0:
1014 break;
1015 case 1:
1016 if (rebuild_cnt >= rs->md.raid_disks)
1017 goto too_many;
1018 break;
1019 case 4:
1020 case 5:
1021 case 6:
1022 if (rebuild_cnt > rs->raid_type->parity_devs)
1023 goto too_many;
1024 break;
1025 case 10:
1026 copies = raid10_md_layout_to_copies(rs->md.new_layout);
1027 if (copies < 2) {
1028 DMERR("Bogus raid10 data copies < 2!");
1029 return -EINVAL;
1030 }
1031
1032 if (rebuild_cnt < copies)
1033 break;
1034
1035 /*
1036 * It is possible to have a higher rebuild count for RAID10,
1037 * as long as the failed devices occur in different mirror
1038 * groups (i.e. different stripes).
1039 *
1040 * When checking "near" format, make sure no adjacent devices
1041 * have failed beyond what can be handled. In addition to the
1042 * simple case where the number of devices is a multiple of the
1043 * number of copies, we must also handle cases where the number
1044 * of devices is not a multiple of the number of copies.
1045 * E.g. dev1 dev2 dev3 dev4 dev5
1046 * A A B B C
1047 * C D D E E
1048 */
1049 if (__is_raid10_near(rs->md.new_layout)) {
1050 for (i = 0; i < rs->md.raid_disks; i++) {
1051 if (!(i % copies))
1052 rebuilds_per_group = 0;
1053 if ((!rs->dev[i].rdev.sb_page ||
1054 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
1055 (++rebuilds_per_group >= copies))
1056 goto too_many;
1057 }
1058 break;
1059 }
1060
1061 /*
1062 * When checking "far" and "offset" formats, we need to ensure
1063 * that the device that holds its copy is not also dead or
1064 * being rebuilt. (Note that "far" and "offset" formats only
1065 * support two copies right now. These formats also only ever
1066 * use the 'use_far_sets' variant.)
1067 *
1068 * This check is somewhat complicated by the need to account
1069 * for arrays that are not a multiple of (far) copies. This
1070 * results in the need to treat the last (potentially larger)
1071 * set differently.
1072 */
1073 group_size = (rs->md.raid_disks / copies);
1074 last_group_start = (rs->md.raid_disks / group_size) - 1;
1075 last_group_start *= group_size;
1076 for (i = 0; i < rs->md.raid_disks; i++) {
1077 if (!(i % copies) && !(i > last_group_start))
1078 rebuilds_per_group = 0;
1079 if ((!rs->dev[i].rdev.sb_page ||
1080 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
1081 (++rebuilds_per_group >= copies))
1082 goto too_many;
1083 }
1084 break;
1085 default:
1086 if (rebuild_cnt)
1087 return -EINVAL;
1088 }
1089
1090 return 0;
1091
1092too_many:
1093 return -EINVAL;
1094}
1095
1096/*
1097 * Possible arguments are...
1098 * <chunk_size> [optional_args]
1099 *
1100 * Argument definitions
1101 * <chunk_size> The number of sectors per disk that
1102 * will form the "stripe"
1103 * [[no]sync] Force or prevent recovery of the
1104 * entire array
1105 * [rebuild <idx>] Rebuild the drive indicated by the index
1106 * [daemon_sleep <ms>] Time between bitmap daemon work to
1107 * clear bits
1108 * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1109 * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1110 * [write_mostly <idx>] Indicate a write mostly drive via index
1111 * [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
1112 * [stripe_cache <sectors>] Stripe cache size for higher RAIDs
1113 * [region_size <sectors>] Defines granularity of bitmap
1114 * [journal_dev <dev>] raid4/5/6 journaling deviice
1115 * (i.e. write hole closing log)
1116 *
1117 * RAID10-only options:
1118 * [raid10_copies <# copies>] Number of copies. (Default: 2)
1119 * [raid10_format <near|far|offset>] Layout algorithm. (Default: near)
1120 */
1121static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
1122 unsigned int num_raid_params)
1123{
1124 int value, raid10_format = ALGORITHM_RAID10_DEFAULT;
1125 unsigned int raid10_copies = 2;
1126 unsigned int i, write_mostly = 0;
1127 unsigned int region_size = 0;
1128 sector_t max_io_len;
1129 const char *arg, *key;
1130 struct raid_dev *rd;
1131 struct raid_type *rt = rs->raid_type;
1132
1133 arg = dm_shift_arg(as);
1134 num_raid_params--; /* Account for chunk_size argument */
1135
1136 if (kstrtoint(arg, 10, &value) < 0) {
1137 rs->ti->error = "Bad numerical argument given for chunk_size";
1138 return -EINVAL;
1139 }
1140
1141 /*
1142 * First, parse the in-order required arguments
1143 * "chunk_size" is the only argument of this type.
1144 */
1145 if (rt_is_raid1(rt)) {
1146 if (value)
1147 DMERR("Ignoring chunk size parameter for RAID 1");
1148 value = 0;
1149 } else if (!is_power_of_2(value)) {
1150 rs->ti->error = "Chunk size must be a power of 2";
1151 return -EINVAL;
1152 } else if (value < 8) {
1153 rs->ti->error = "Chunk size value is too small";
1154 return -EINVAL;
1155 }
1156
1157 rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
1158
1159 /*
1160 * We set each individual device as In_sync with a completed
1161 * 'recovery_offset'. If there has been a device failure or
1162 * replacement then one of the following cases applies:
1163 *
1164 * 1) User specifies 'rebuild'.
1165 * - Device is reset when param is read.
1166 * 2) A new device is supplied.
1167 * - No matching superblock found, resets device.
1168 * 3) Device failure was transient and returns on reload.
1169 * - Failure noticed, resets device for bitmap replay.
1170 * 4) Device hadn't completed recovery after previous failure.
1171 * - Superblock is read and overrides recovery_offset.
1172 *
1173 * What is found in the superblocks of the devices is always
1174 * authoritative, unless 'rebuild' or '[no]sync' was specified.
1175 */
1176 for (i = 0; i < rs->raid_disks; i++) {
1177 set_bit(In_sync, &rs->dev[i].rdev.flags);
1178 rs->dev[i].rdev.recovery_offset = MaxSector;
1179 }
1180
1181 /*
1182 * Second, parse the unordered optional arguments
1183 */
1184 for (i = 0; i < num_raid_params; i++) {
1185 key = dm_shift_arg(as);
1186 if (!key) {
1187 rs->ti->error = "Not enough raid parameters given";
1188 return -EINVAL;
1189 }
1190
1191 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) {
1192 if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1193 rs->ti->error = "Only one 'nosync' argument allowed";
1194 return -EINVAL;
1195 }
1196 continue;
1197 }
1198 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) {
1199 if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) {
1200 rs->ti->error = "Only one 'sync' argument allowed";
1201 return -EINVAL;
1202 }
1203 continue;
1204 }
1205 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) {
1206 if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
1207 rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed";
1208 return -EINVAL;
1209 }
1210 continue;
1211 }
1212
1213 arg = dm_shift_arg(as);
1214 i++; /* Account for the argument pairs */
1215 if (!arg) {
1216 rs->ti->error = "Wrong number of raid parameters given";
1217 return -EINVAL;
1218 }
1219
1220 /*
1221 * Parameters that take a string value are checked here.
1222 */
1223 /* "raid10_format {near|offset|far} */
1224 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) {
1225 if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) {
1226 rs->ti->error = "Only one 'raid10_format' argument pair allowed";
1227 return -EINVAL;
1228 }
1229 if (!rt_is_raid10(rt)) {
1230 rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type";
1231 return -EINVAL;
1232 }
1233 raid10_format = raid10_name_to_format(arg);
1234 if (raid10_format < 0) {
1235 rs->ti->error = "Invalid 'raid10_format' value given";
1236 return raid10_format;
1237 }
1238 continue;
1239 }
1240
1241 /* "journal_dev <dev>" */
1242 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV))) {
1243 int r;
1244 struct md_rdev *jdev;
1245
1246 if (test_and_set_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
1247 rs->ti->error = "Only one raid4/5/6 set journaling device allowed";
1248 return -EINVAL;
1249 }
1250 if (!rt_is_raid456(rt)) {
1251 rs->ti->error = "'journal_dev' is an invalid parameter for this RAID type";
1252 return -EINVAL;
1253 }
1254 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
1255 &rs->journal_dev.dev);
1256 if (r) {
1257 rs->ti->error = "raid4/5/6 journal device lookup failure";
1258 return r;
1259 }
1260 jdev = &rs->journal_dev.rdev;
1261 md_rdev_init(jdev);
1262 jdev->mddev = &rs->md;
1263 jdev->bdev = rs->journal_dev.dev->bdev;
1264 jdev->sectors = to_sector(i_size_read(jdev->bdev->bd_inode));
1265 if (jdev->sectors < MIN_RAID456_JOURNAL_SPACE) {
1266 rs->ti->error = "No space for raid4/5/6 journal";
1267 return -ENOSPC;
1268 }
1269 rs->journal_dev.mode = R5C_JOURNAL_MODE_WRITE_THROUGH;
1270 set_bit(Journal, &jdev->flags);
1271 continue;
1272 }
1273
1274 /* "journal_mode <mode>" ("journal_dev" mandatory!) */
1275 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE))) {
1276 int r;
1277
1278 if (!test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
1279 rs->ti->error = "raid4/5/6 'journal_mode' is invalid without 'journal_dev'";
1280 return -EINVAL;
1281 }
1282 if (test_and_set_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
1283 rs->ti->error = "Only one raid4/5/6 'journal_mode' argument allowed";
1284 return -EINVAL;
1285 }
1286 r = dm_raid_journal_mode_to_md(arg);
1287 if (r < 0) {
1288 rs->ti->error = "Invalid 'journal_mode' argument";
1289 return r;
1290 }
1291 rs->journal_dev.mode = r;
1292 continue;
1293 }
1294
1295 /*
1296 * Parameters with number values from here on.
1297 */
1298 if (kstrtoint(arg, 10, &value) < 0) {
1299 rs->ti->error = "Bad numerical argument given in raid params";
1300 return -EINVAL;
1301 }
1302
1303 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) {
1304 /*
1305 * "rebuild" is being passed in by userspace to provide
1306 * indexes of replaced devices and to set up additional
1307 * devices on raid level takeover.
1308 */
1309 if (!__within_range(value, 0, rs->raid_disks - 1)) {
1310 rs->ti->error = "Invalid rebuild index given";
1311 return -EINVAL;
1312 }
1313
1314 if (test_and_set_bit(value, (void *) rs->rebuild_disks)) {
1315 rs->ti->error = "rebuild for this index already given";
1316 return -EINVAL;
1317 }
1318
1319 rd = rs->dev + value;
1320 clear_bit(In_sync, &rd->rdev.flags);
1321 clear_bit(Faulty, &rd->rdev.flags);
1322 rd->rdev.recovery_offset = 0;
1323 set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags);
1324 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) {
1325 if (!rt_is_raid1(rt)) {
1326 rs->ti->error = "write_mostly option is only valid for RAID1";
1327 return -EINVAL;
1328 }
1329
1330 if (!__within_range(value, 0, rs->md.raid_disks - 1)) {
1331 rs->ti->error = "Invalid write_mostly index given";
1332 return -EINVAL;
1333 }
1334
1335 write_mostly++;
1336 set_bit(WriteMostly, &rs->dev[value].rdev.flags);
1337 set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags);
1338 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) {
1339 if (!rt_is_raid1(rt)) {
1340 rs->ti->error = "max_write_behind option is only valid for RAID1";
1341 return -EINVAL;
1342 }
1343
1344 if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) {
1345 rs->ti->error = "Only one max_write_behind argument pair allowed";
1346 return -EINVAL;
1347 }
1348
1349 /*
1350 * In device-mapper, we specify things in sectors, but
1351 * MD records this value in kB
1352 */
1353 if (value < 0 || value / 2 > COUNTER_MAX) {
1354 rs->ti->error = "Max write-behind limit out of range";
1355 return -EINVAL;
1356 }
1357
1358 rs->md.bitmap_info.max_write_behind = value / 2;
1359 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) {
1360 if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) {
1361 rs->ti->error = "Only one daemon_sleep argument pair allowed";
1362 return -EINVAL;
1363 }
1364 if (value < 0) {
1365 rs->ti->error = "daemon sleep period out of range";
1366 return -EINVAL;
1367 }
1368 rs->md.bitmap_info.daemon_sleep = value;
1369 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) {
1370 /* Userspace passes new data_offset after having extended the the data image LV */
1371 if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
1372 rs->ti->error = "Only one data_offset argument pair allowed";
1373 return -EINVAL;
1374 }
1375 /* Ensure sensible data offset */
1376 if (value < 0 ||
1377 (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) {
1378 rs->ti->error = "Bogus data_offset value";
1379 return -EINVAL;
1380 }
1381 rs->data_offset = value;
1382 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) {
1383 /* Define the +/-# of disks to add to/remove from the given raid set */
1384 if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
1385 rs->ti->error = "Only one delta_disks argument pair allowed";
1386 return -EINVAL;
1387 }
1388 /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */
1389 if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) {
1390 rs->ti->error = "Too many delta_disk requested";
1391 return -EINVAL;
1392 }
1393
1394 rs->delta_disks = value;
1395 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) {
1396 if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) {
1397 rs->ti->error = "Only one stripe_cache argument pair allowed";
1398 return -EINVAL;
1399 }
1400
1401 if (!rt_is_raid456(rt)) {
1402 rs->ti->error = "Inappropriate argument: stripe_cache";
1403 return -EINVAL;
1404 }
1405
1406 if (value < 0) {
1407 rs->ti->error = "Bogus stripe cache entries value";
1408 return -EINVAL;
1409 }
1410 rs->stripe_cache_entries = value;
1411 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) {
1412 if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
1413 rs->ti->error = "Only one min_recovery_rate argument pair allowed";
1414 return -EINVAL;
1415 }
1416
1417 if (value < 0) {
1418 rs->ti->error = "min_recovery_rate out of range";
1419 return -EINVAL;
1420 }
1421 rs->md.sync_speed_min = value;
1422 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) {
1423 if (test_and_set_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) {
1424 rs->ti->error = "Only one max_recovery_rate argument pair allowed";
1425 return -EINVAL;
1426 }
1427
1428 if (value < 0) {
1429 rs->ti->error = "max_recovery_rate out of range";
1430 return -EINVAL;
1431 }
1432 rs->md.sync_speed_max = value;
1433 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) {
1434 if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) {
1435 rs->ti->error = "Only one region_size argument pair allowed";
1436 return -EINVAL;
1437 }
1438
1439 region_size = value;
1440 rs->requested_bitmap_chunk_sectors = value;
1441 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) {
1442 if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) {
1443 rs->ti->error = "Only one raid10_copies argument pair allowed";
1444 return -EINVAL;
1445 }
1446
1447 if (!__within_range(value, 2, rs->md.raid_disks)) {
1448 rs->ti->error = "Bad value for 'raid10_copies'";
1449 return -EINVAL;
1450 }
1451
1452 raid10_copies = value;
1453 } else {
1454 DMERR("Unable to parse RAID parameter: %s", key);
1455 rs->ti->error = "Unable to parse RAID parameter";
1456 return -EINVAL;
1457 }
1458 }
1459
1460 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) &&
1461 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1462 rs->ti->error = "sync and nosync are mutually exclusive";
1463 return -EINVAL;
1464 }
1465
1466 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) &&
1467 (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ||
1468 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))) {
1469 rs->ti->error = "sync/nosync and rebuild are mutually exclusive";
1470 return -EINVAL;
1471 }
1472
1473 if (write_mostly >= rs->md.raid_disks) {
1474 rs->ti->error = "Can't set all raid1 devices to write_mostly";
1475 return -EINVAL;
1476 }
1477
1478 if (rs->md.sync_speed_max &&
1479 rs->md.sync_speed_min > rs->md.sync_speed_max) {
1480 rs->ti->error = "Bogus recovery rates";
1481 return -EINVAL;
1482 }
1483
1484 if (validate_region_size(rs, region_size))
1485 return -EINVAL;
1486
1487 if (rs->md.chunk_sectors)
1488 max_io_len = rs->md.chunk_sectors;
1489 else
1490 max_io_len = region_size;
1491
1492 if (dm_set_target_max_io_len(rs->ti, max_io_len))
1493 return -EINVAL;
1494
1495 if (rt_is_raid10(rt)) {
1496 if (raid10_copies > rs->md.raid_disks) {
1497 rs->ti->error = "Not enough devices to satisfy specification";
1498 return -EINVAL;
1499 }
1500
1501 rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies);
1502 if (rs->md.new_layout < 0) {
1503 rs->ti->error = "Error getting raid10 format";
1504 return rs->md.new_layout;
1505 }
1506
1507 rt = get_raid_type_by_ll(10, rs->md.new_layout);
1508 if (!rt) {
1509 rs->ti->error = "Failed to recognize new raid10 layout";
1510 return -EINVAL;
1511 }
1512
1513 if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT ||
1514 rt->algorithm == ALGORITHM_RAID10_NEAR) &&
1515 test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
1516 rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible";
1517 return -EINVAL;
1518 }
1519 }
1520
1521 rs->raid10_copies = raid10_copies;
1522
1523 /* Assume there are no metadata devices until the drives are parsed */
1524 rs->md.persistent = 0;
1525 rs->md.external = 1;
1526
1527 /* Check, if any invalid ctr arguments have been passed in for the raid level */
1528 return rs_check_for_valid_flags(rs);
1529}
1530
1531/* Set raid4/5/6 cache size */
1532static int rs_set_raid456_stripe_cache(struct raid_set *rs)
1533{
1534 int r;
1535 struct r5conf *conf;
1536 struct mddev *mddev = &rs->md;
1537 uint32_t min_stripes = max(mddev->chunk_sectors, mddev->new_chunk_sectors) / 2;
1538 uint32_t nr_stripes = rs->stripe_cache_entries;
1539
1540 if (!rt_is_raid456(rs->raid_type)) {
1541 rs->ti->error = "Inappropriate raid level; cannot change stripe_cache size";
1542 return -EINVAL;
1543 }
1544
1545 if (nr_stripes < min_stripes) {
1546 DMINFO("Adjusting requested %u stripe cache entries to %u to suit stripe size",
1547 nr_stripes, min_stripes);
1548 nr_stripes = min_stripes;
1549 }
1550
1551 conf = mddev->private;
1552 if (!conf) {
1553 rs->ti->error = "Cannot change stripe_cache size on inactive RAID set";
1554 return -EINVAL;
1555 }
1556
1557 /* Try setting number of stripes in raid456 stripe cache */
1558 if (conf->min_nr_stripes != nr_stripes) {
1559 r = raid5_set_cache_size(mddev, nr_stripes);
1560 if (r) {
1561 rs->ti->error = "Failed to set raid4/5/6 stripe cache size";
1562 return r;
1563 }
1564
1565 DMINFO("%u stripe cache entries", nr_stripes);
1566 }
1567
1568 return 0;
1569}
1570
1571/* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */
1572static unsigned int mddev_data_stripes(struct raid_set *rs)
1573{
1574 return rs->md.raid_disks - rs->raid_type->parity_devs;
1575}
1576
1577/* Return # of data stripes of @rs (i.e. as of ctr) */
1578static unsigned int rs_data_stripes(struct raid_set *rs)
1579{
1580 return rs->raid_disks - rs->raid_type->parity_devs;
1581}
1582
1583/*
1584 * Retrieve rdev->sectors from any valid raid device of @rs
1585 * to allow userpace to pass in arbitray "- -" device tupples.
1586 */
1587static sector_t __rdev_sectors(struct raid_set *rs)
1588{
1589 int i;
1590
1591 for (i = 0; i < rs->md.raid_disks; i++) {
1592 struct md_rdev *rdev = &rs->dev[i].rdev;
1593
1594 if (!test_bit(Journal, &rdev->flags) &&
1595 rdev->bdev && rdev->sectors)
1596 return rdev->sectors;
1597 }
1598
1599 return 0;
1600}
1601
1602/* Check that calculated dev_sectors fits all component devices. */
1603static int _check_data_dev_sectors(struct raid_set *rs)
1604{
1605 sector_t ds = ~0;
1606 struct md_rdev *rdev;
1607
1608 rdev_for_each(rdev, &rs->md)
1609 if (!test_bit(Journal, &rdev->flags) && rdev->bdev) {
1610 ds = min(ds, to_sector(i_size_read(rdev->bdev->bd_inode)));
1611 if (ds < rs->md.dev_sectors) {
1612 rs->ti->error = "Component device(s) too small";
1613 return -EINVAL;
1614 }
1615 }
1616
1617 return 0;
1618}
1619
1620/* Calculate the sectors per device and per array used for @rs */
1621static int rs_set_dev_and_array_sectors(struct raid_set *rs, sector_t sectors, bool use_mddev)
1622{
1623 int delta_disks;
1624 unsigned int data_stripes;
1625 sector_t array_sectors = sectors, dev_sectors = sectors;
1626 struct mddev *mddev = &rs->md;
1627
1628 if (use_mddev) {
1629 delta_disks = mddev->delta_disks;
1630 data_stripes = mddev_data_stripes(rs);
1631 } else {
1632 delta_disks = rs->delta_disks;
1633 data_stripes = rs_data_stripes(rs);
1634 }
1635
1636 /* Special raid1 case w/o delta_disks support (yet) */
1637 if (rt_is_raid1(rs->raid_type))
1638 ;
1639 else if (rt_is_raid10(rs->raid_type)) {
1640 if (rs->raid10_copies < 2 ||
1641 delta_disks < 0) {
1642 rs->ti->error = "Bogus raid10 data copies or delta disks";
1643 return -EINVAL;
1644 }
1645
1646 dev_sectors *= rs->raid10_copies;
1647 if (sector_div(dev_sectors, data_stripes))
1648 goto bad;
1649
1650 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1651 if (sector_div(array_sectors, rs->raid10_copies))
1652 goto bad;
1653
1654 } else if (sector_div(dev_sectors, data_stripes))
1655 goto bad;
1656
1657 else
1658 /* Striped layouts */
1659 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1660
1661 mddev->array_sectors = array_sectors;
1662 mddev->dev_sectors = dev_sectors;
1663 rs_set_rdev_sectors(rs);
1664
1665 return _check_data_dev_sectors(rs);
1666bad:
1667 rs->ti->error = "Target length not divisible by number of data devices";
1668 return -EINVAL;
1669}
1670
1671/* Setup recovery on @rs */
1672static void rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors)
1673{
1674 /* raid0 does not recover */
1675 if (rs_is_raid0(rs))
1676 rs->md.recovery_cp = MaxSector;
1677 /*
1678 * A raid6 set has to be recovered either
1679 * completely or for the grown part to
1680 * ensure proper parity and Q-Syndrome
1681 */
1682 else if (rs_is_raid6(rs))
1683 rs->md.recovery_cp = dev_sectors;
1684 /*
1685 * Other raid set types may skip recovery
1686 * depending on the 'nosync' flag.
1687 */
1688 else
1689 rs->md.recovery_cp = test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)
1690 ? MaxSector : dev_sectors;
1691}
1692
1693static void do_table_event(struct work_struct *ws)
1694{
1695 struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
1696
1697 smp_rmb(); /* Make sure we access most actual mddev properties */
1698 if (!rs_is_reshaping(rs)) {
1699 if (rs_is_raid10(rs))
1700 rs_set_rdev_sectors(rs);
1701 rs_set_capacity(rs);
1702 }
1703 dm_table_event(rs->ti->table);
1704}
1705
1706/*
1707 * Make sure a valid takover (level switch) is being requested on @rs
1708 *
1709 * Conversions of raid sets from one MD personality to another
1710 * have to conform to restrictions which are enforced here.
1711 */
1712static int rs_check_takeover(struct raid_set *rs)
1713{
1714 struct mddev *mddev = &rs->md;
1715 unsigned int near_copies;
1716
1717 if (rs->md.degraded) {
1718 rs->ti->error = "Can't takeover degraded raid set";
1719 return -EPERM;
1720 }
1721
1722 if (rs_is_reshaping(rs)) {
1723 rs->ti->error = "Can't takeover reshaping raid set";
1724 return -EPERM;
1725 }
1726
1727 switch (mddev->level) {
1728 case 0:
1729 /* raid0 -> raid1/5 with one disk */
1730 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1731 mddev->raid_disks == 1)
1732 return 0;
1733
1734 /* raid0 -> raid10 */
1735 if (mddev->new_level == 10 &&
1736 !(rs->raid_disks % mddev->raid_disks))
1737 return 0;
1738
1739 /* raid0 with multiple disks -> raid4/5/6 */
1740 if (__within_range(mddev->new_level, 4, 6) &&
1741 mddev->new_layout == ALGORITHM_PARITY_N &&
1742 mddev->raid_disks > 1)
1743 return 0;
1744
1745 break;
1746
1747 case 10:
1748 /* Can't takeover raid10_offset! */
1749 if (__is_raid10_offset(mddev->layout))
1750 break;
1751
1752 near_copies = __raid10_near_copies(mddev->layout);
1753
1754 /* raid10* -> raid0 */
1755 if (mddev->new_level == 0) {
1756 /* Can takeover raid10_near with raid disks divisable by data copies! */
1757 if (near_copies > 1 &&
1758 !(mddev->raid_disks % near_copies)) {
1759 mddev->raid_disks /= near_copies;
1760 mddev->delta_disks = mddev->raid_disks;
1761 return 0;
1762 }
1763
1764 /* Can takeover raid10_far */
1765 if (near_copies == 1 &&
1766 __raid10_far_copies(mddev->layout) > 1)
1767 return 0;
1768
1769 break;
1770 }
1771
1772 /* raid10_{near,far} -> raid1 */
1773 if (mddev->new_level == 1 &&
1774 max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks)
1775 return 0;
1776
1777 /* raid10_{near,far} with 2 disks -> raid4/5 */
1778 if (__within_range(mddev->new_level, 4, 5) &&
1779 mddev->raid_disks == 2)
1780 return 0;
1781 break;
1782
1783 case 1:
1784 /* raid1 with 2 disks -> raid4/5 */
1785 if (__within_range(mddev->new_level, 4, 5) &&
1786 mddev->raid_disks == 2) {
1787 mddev->degraded = 1;
1788 return 0;
1789 }
1790
1791 /* raid1 -> raid0 */
1792 if (mddev->new_level == 0 &&
1793 mddev->raid_disks == 1)
1794 return 0;
1795
1796 /* raid1 -> raid10 */
1797 if (mddev->new_level == 10)
1798 return 0;
1799 break;
1800
1801 case 4:
1802 /* raid4 -> raid0 */
1803 if (mddev->new_level == 0)
1804 return 0;
1805
1806 /* raid4 -> raid1/5 with 2 disks */
1807 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1808 mddev->raid_disks == 2)
1809 return 0;
1810
1811 /* raid4 -> raid5/6 with parity N */
1812 if (__within_range(mddev->new_level, 5, 6) &&
1813 mddev->layout == ALGORITHM_PARITY_N)
1814 return 0;
1815 break;
1816
1817 case 5:
1818 /* raid5 with parity N -> raid0 */
1819 if (mddev->new_level == 0 &&
1820 mddev->layout == ALGORITHM_PARITY_N)
1821 return 0;
1822
1823 /* raid5 with parity N -> raid4 */
1824 if (mddev->new_level == 4 &&
1825 mddev->layout == ALGORITHM_PARITY_N)
1826 return 0;
1827
1828 /* raid5 with 2 disks -> raid1/4/10 */
1829 if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) &&
1830 mddev->raid_disks == 2)
1831 return 0;
1832
1833 /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */
1834 if (mddev->new_level == 6 &&
1835 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
1836 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6)))
1837 return 0;
1838 break;
1839
1840 case 6:
1841 /* raid6 with parity N -> raid0 */
1842 if (mddev->new_level == 0 &&
1843 mddev->layout == ALGORITHM_PARITY_N)
1844 return 0;
1845
1846 /* raid6 with parity N -> raid4 */
1847 if (mddev->new_level == 4 &&
1848 mddev->layout == ALGORITHM_PARITY_N)
1849 return 0;
1850
1851 /* raid6_*_n with Q-Syndrome N -> raid5_* */
1852 if (mddev->new_level == 5 &&
1853 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
1854 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC)))
1855 return 0;
1856 break;
1857
1858 default:
1859 break;
1860 }
1861
1862 rs->ti->error = "takeover not possible";
1863 return -EINVAL;
1864}
1865
1866/* True if @rs requested to be taken over */
1867static bool rs_takeover_requested(struct raid_set *rs)
1868{
1869 return rs->md.new_level != rs->md.level;
1870}
1871
1872/* True if layout is set to reshape. */
1873static bool rs_is_layout_change(struct raid_set *rs, bool use_mddev)
1874{
1875 return (use_mddev ? rs->md.delta_disks : rs->delta_disks) ||
1876 rs->md.new_layout != rs->md.layout ||
1877 rs->md.new_chunk_sectors != rs->md.chunk_sectors;
1878}
1879
1880/* True if @rs is requested to reshape by ctr */
1881static bool rs_reshape_requested(struct raid_set *rs)
1882{
1883 bool change;
1884 struct mddev *mddev = &rs->md;
1885
1886 if (rs_takeover_requested(rs))
1887 return false;
1888
1889 if (rs_is_raid0(rs))
1890 return false;
1891
1892 change = rs_is_layout_change(rs, false);
1893
1894 /* Historical case to support raid1 reshape without delta disks */
1895 if (rs_is_raid1(rs)) {
1896 if (rs->delta_disks)
1897 return !!rs->delta_disks;
1898
1899 return !change &&
1900 mddev->raid_disks != rs->raid_disks;
1901 }
1902
1903 if (rs_is_raid10(rs))
1904 return change &&
1905 !__is_raid10_far(mddev->new_layout) &&
1906 rs->delta_disks >= 0;
1907
1908 return change;
1909}
1910
1911/* Features */
1912#define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */
1913
1914/* State flags for sb->flags */
1915#define SB_FLAG_RESHAPE_ACTIVE 0x1
1916#define SB_FLAG_RESHAPE_BACKWARDS 0x2
1917
1918/*
1919 * This structure is never routinely used by userspace, unlike md superblocks.
1920 * Devices with this superblock should only ever be accessed via device-mapper.
1921 */
1922#define DM_RAID_MAGIC 0x64526D44
1923struct dm_raid_superblock {
1924 __le32 magic; /* "DmRd" */
1925 __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */
1926
1927 __le32 num_devices; /* Number of devices in this raid set. (Max 64) */
1928 __le32 array_position; /* The position of this drive in the raid set */
1929
1930 __le64 events; /* Incremented by md when superblock updated */
1931 __le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */
1932 /* indicate failures (see extension below) */
1933
1934 /*
1935 * This offset tracks the progress of the repair or replacement of
1936 * an individual drive.
1937 */
1938 __le64 disk_recovery_offset;
1939
1940 /*
1941 * This offset tracks the progress of the initial raid set
1942 * synchronisation/parity calculation.
1943 */
1944 __le64 array_resync_offset;
1945
1946 /*
1947 * raid characteristics
1948 */
1949 __le32 level;
1950 __le32 layout;
1951 __le32 stripe_sectors;
1952
1953 /********************************************************************
1954 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
1955 *
1956 * FEATURE_FLAG_SUPPORTS_V190 in the compat_features member indicates that those exist
1957 */
1958
1959 __le32 flags; /* Flags defining array states for reshaping */
1960
1961 /*
1962 * This offset tracks the progress of a raid
1963 * set reshape in order to be able to restart it
1964 */
1965 __le64 reshape_position;
1966
1967 /*
1968 * These define the properties of the array in case of an interrupted reshape
1969 */
1970 __le32 new_level;
1971 __le32 new_layout;
1972 __le32 new_stripe_sectors;
1973 __le32 delta_disks;
1974
1975 __le64 array_sectors; /* Array size in sectors */
1976
1977 /*
1978 * Sector offsets to data on devices (reshaping).
1979 * Needed to support out of place reshaping, thus
1980 * not writing over any stripes whilst converting
1981 * them from old to new layout
1982 */
1983 __le64 data_offset;
1984 __le64 new_data_offset;
1985
1986 __le64 sectors; /* Used device size in sectors */
1987
1988 /*
1989 * Additonal Bit field of devices indicating failures to support
1990 * up to 256 devices with the 1.9.0 on-disk metadata format
1991 */
1992 __le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1];
1993
1994 __le32 incompat_features; /* Used to indicate any incompatible features */
1995
1996 /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */
1997} __packed;
1998
1999/*
2000 * Check for reshape constraints on raid set @rs:
2001 *
2002 * - reshape function non-existent
2003 * - degraded set
2004 * - ongoing recovery
2005 * - ongoing reshape
2006 *
2007 * Returns 0 if none or -EPERM if given constraint
2008 * and error message reference in @errmsg
2009 */
2010static int rs_check_reshape(struct raid_set *rs)
2011{
2012 struct mddev *mddev = &rs->md;
2013
2014 if (!mddev->pers || !mddev->pers->check_reshape)
2015 rs->ti->error = "Reshape not supported";
2016 else if (mddev->degraded)
2017 rs->ti->error = "Can't reshape degraded raid set";
2018 else if (rs_is_recovering(rs))
2019 rs->ti->error = "Convert request on recovering raid set prohibited";
2020 else if (rs_is_reshaping(rs))
2021 rs->ti->error = "raid set already reshaping!";
2022 else if (!(rs_is_raid1(rs) || rs_is_raid10(rs) || rs_is_raid456(rs)))
2023 rs->ti->error = "Reshaping only supported for raid1/4/5/6/10";
2024 else
2025 return 0;
2026
2027 return -EPERM;
2028}
2029
2030static int read_disk_sb(struct md_rdev *rdev, int size, bool force_reload)
2031{
2032 BUG_ON(!rdev->sb_page);
2033
2034 if (rdev->sb_loaded && !force_reload)
2035 return 0;
2036
2037 rdev->sb_loaded = 0;
2038
2039 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) {
2040 DMERR("Failed to read superblock of device at position %d",
2041 rdev->raid_disk);
2042 md_error(rdev->mddev, rdev);
2043 set_bit(Faulty, &rdev->flags);
2044 return -EIO;
2045 }
2046
2047 rdev->sb_loaded = 1;
2048
2049 return 0;
2050}
2051
2052static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
2053{
2054 failed_devices[0] = le64_to_cpu(sb->failed_devices);
2055 memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices));
2056
2057 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
2058 int i = ARRAY_SIZE(sb->extended_failed_devices);
2059
2060 while (i--)
2061 failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]);
2062 }
2063}
2064
2065static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
2066{
2067 int i = ARRAY_SIZE(sb->extended_failed_devices);
2068
2069 sb->failed_devices = cpu_to_le64(failed_devices[0]);
2070 while (i--)
2071 sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]);
2072}
2073
2074/*
2075 * Synchronize the superblock members with the raid set properties
2076 *
2077 * All superblock data is little endian.
2078 */
2079static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
2080{
2081 bool update_failed_devices = false;
2082 unsigned int i;
2083 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
2084 struct dm_raid_superblock *sb;
2085 struct raid_set *rs = container_of(mddev, struct raid_set, md);
2086
2087 /* No metadata device, no superblock */
2088 if (!rdev->meta_bdev)
2089 return;
2090
2091 BUG_ON(!rdev->sb_page);
2092
2093 sb = page_address(rdev->sb_page);
2094
2095 sb_retrieve_failed_devices(sb, failed_devices);
2096
2097 for (i = 0; i < rs->raid_disks; i++)
2098 if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) {
2099 update_failed_devices = true;
2100 set_bit(i, (void *) failed_devices);
2101 }
2102
2103 if (update_failed_devices)
2104 sb_update_failed_devices(sb, failed_devices);
2105
2106 sb->magic = cpu_to_le32(DM_RAID_MAGIC);
2107 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
2108
2109 sb->num_devices = cpu_to_le32(mddev->raid_disks);
2110 sb->array_position = cpu_to_le32(rdev->raid_disk);
2111
2112 sb->events = cpu_to_le64(mddev->events);
2113
2114 sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
2115 sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
2116
2117 sb->level = cpu_to_le32(mddev->level);
2118 sb->layout = cpu_to_le32(mddev->layout);
2119 sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
2120
2121 /********************************************************************
2122 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
2123 *
2124 * FEATURE_FLAG_SUPPORTS_V190 in the compat_features member indicates that those exist
2125 */
2126 sb->new_level = cpu_to_le32(mddev->new_level);
2127 sb->new_layout = cpu_to_le32(mddev->new_layout);
2128 sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors);
2129
2130 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2131
2132 smp_rmb(); /* Make sure we access most recent reshape position */
2133 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2134 if (le64_to_cpu(sb->reshape_position) != MaxSector) {
2135 /* Flag ongoing reshape */
2136 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE);
2137
2138 if (mddev->delta_disks < 0 || mddev->reshape_backwards)
2139 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS);
2140 } else {
2141 /* Clear reshape flags */
2142 sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS));
2143 }
2144
2145 sb->array_sectors = cpu_to_le64(mddev->array_sectors);
2146 sb->data_offset = cpu_to_le64(rdev->data_offset);
2147 sb->new_data_offset = cpu_to_le64(rdev->new_data_offset);
2148 sb->sectors = cpu_to_le64(rdev->sectors);
2149 sb->incompat_features = cpu_to_le32(0);
2150
2151 /* Zero out the rest of the payload after the size of the superblock */
2152 memset(sb + 1, 0, rdev->sb_size - sizeof(*sb));
2153}
2154
2155/*
2156 * super_load
2157 *
2158 * This function creates a superblock if one is not found on the device
2159 * and will decide which superblock to use if there's a choice.
2160 *
2161 * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
2162 */
2163static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
2164{
2165 int r;
2166 struct dm_raid_superblock *sb;
2167 struct dm_raid_superblock *refsb;
2168 uint64_t events_sb, events_refsb;
2169
2170 r = read_disk_sb(rdev, rdev->sb_size, false);
2171 if (r)
2172 return r;
2173
2174 sb = page_address(rdev->sb_page);
2175
2176 /*
2177 * Two cases that we want to write new superblocks and rebuild:
2178 * 1) New device (no matching magic number)
2179 * 2) Device specified for rebuild (!In_sync w/ offset == 0)
2180 */
2181 if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
2182 (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
2183 super_sync(rdev->mddev, rdev);
2184
2185 set_bit(FirstUse, &rdev->flags);
2186 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
2187
2188 /* Force writing of superblocks to disk */
2189 set_bit(MD_SB_CHANGE_DEVS, &rdev->mddev->sb_flags);
2190
2191 /* Any superblock is better than none, choose that if given */
2192 return refdev ? 0 : 1;
2193 }
2194
2195 if (!refdev)
2196 return 1;
2197
2198 events_sb = le64_to_cpu(sb->events);
2199
2200 refsb = page_address(refdev->sb_page);
2201 events_refsb = le64_to_cpu(refsb->events);
2202
2203 return (events_sb > events_refsb) ? 1 : 0;
2204}
2205
2206static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
2207{
2208 int role;
2209 unsigned int d;
2210 struct mddev *mddev = &rs->md;
2211 uint64_t events_sb;
2212 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
2213 struct dm_raid_superblock *sb;
2214 uint32_t new_devs = 0, rebuild_and_new = 0, rebuilds = 0;
2215 struct md_rdev *r;
2216 struct dm_raid_superblock *sb2;
2217
2218 sb = page_address(rdev->sb_page);
2219 events_sb = le64_to_cpu(sb->events);
2220
2221 /*
2222 * Initialise to 1 if this is a new superblock.
2223 */
2224 mddev->events = events_sb ? : 1;
2225
2226 mddev->reshape_position = MaxSector;
2227
2228 mddev->raid_disks = le32_to_cpu(sb->num_devices);
2229 mddev->level = le32_to_cpu(sb->level);
2230 mddev->layout = le32_to_cpu(sb->layout);
2231 mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors);
2232
2233 /*
2234 * Reshaping is supported, e.g. reshape_position is valid
2235 * in superblock and superblock content is authoritative.
2236 */
2237 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
2238 /* Superblock is authoritative wrt given raid set layout! */
2239 mddev->new_level = le32_to_cpu(sb->new_level);
2240 mddev->new_layout = le32_to_cpu(sb->new_layout);
2241 mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors);
2242 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
2243 mddev->array_sectors = le64_to_cpu(sb->array_sectors);
2244
2245 /* raid was reshaping and got interrupted */
2246 if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) {
2247 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
2248 DMERR("Reshape requested but raid set is still reshaping");
2249 return -EINVAL;
2250 }
2251
2252 if (mddev->delta_disks < 0 ||
2253 (!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS)))
2254 mddev->reshape_backwards = 1;
2255 else
2256 mddev->reshape_backwards = 0;
2257
2258 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
2259 rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout);
2260 }
2261
2262 } else {
2263 /*
2264 * No takeover/reshaping, because we don't have the extended v1.9.0 metadata
2265 */
2266 struct raid_type *rt_cur = get_raid_type_by_ll(mddev->level, mddev->layout);
2267 struct raid_type *rt_new = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
2268
2269 if (rs_takeover_requested(rs)) {
2270 if (rt_cur && rt_new)
2271 DMERR("Takeover raid sets from %s to %s not yet supported by metadata. (raid level change)",
2272 rt_cur->name, rt_new->name);
2273 else
2274 DMERR("Takeover raid sets not yet supported by metadata. (raid level change)");
2275 return -EINVAL;
2276 } else if (rs_reshape_requested(rs)) {
2277 DMERR("Reshaping raid sets not yet supported by metadata. (raid layout change keeping level)");
2278 if (mddev->layout != mddev->new_layout) {
2279 if (rt_cur && rt_new)
2280 DMERR(" current layout %s vs new layout %s",
2281 rt_cur->name, rt_new->name);
2282 else
2283 DMERR(" current layout 0x%X vs new layout 0x%X",
2284 le32_to_cpu(sb->layout), mddev->new_layout);
2285 }
2286 if (mddev->chunk_sectors != mddev->new_chunk_sectors)
2287 DMERR(" current stripe sectors %u vs new stripe sectors %u",
2288 mddev->chunk_sectors, mddev->new_chunk_sectors);
2289 if (rs->delta_disks)
2290 DMERR(" current %u disks vs new %u disks",
2291 mddev->raid_disks, mddev->raid_disks + rs->delta_disks);
2292 if (rs_is_raid10(rs)) {
2293 DMERR(" Old layout: %s w/ %u copies",
2294 raid10_md_layout_to_format(mddev->layout),
2295 raid10_md_layout_to_copies(mddev->layout));
2296 DMERR(" New layout: %s w/ %u copies",
2297 raid10_md_layout_to_format(mddev->new_layout),
2298 raid10_md_layout_to_copies(mddev->new_layout));
2299 }
2300 return -EINVAL;
2301 }
2302
2303 DMINFO("Discovered old metadata format; upgrading to extended metadata format");
2304 }
2305
2306 if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
2307 mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
2308
2309 /*
2310 * During load, we set FirstUse if a new superblock was written.
2311 * There are two reasons we might not have a superblock:
2312 * 1) The raid set is brand new - in which case, all of the
2313 * devices must have their In_sync bit set. Also,
2314 * recovery_cp must be 0, unless forced.
2315 * 2) This is a new device being added to an old raid set
2316 * and the new device needs to be rebuilt - in which
2317 * case the In_sync bit will /not/ be set and
2318 * recovery_cp must be MaxSector.
2319 * 3) This is/are a new device(s) being added to an old
2320 * raid set during takeover to a higher raid level
2321 * to provide capacity for redundancy or during reshape
2322 * to add capacity to grow the raid set.
2323 */
2324 d = 0;
2325 rdev_for_each(r, mddev) {
2326 if (test_bit(Journal, &rdev->flags))
2327 continue;
2328
2329 if (test_bit(FirstUse, &r->flags))
2330 new_devs++;
2331
2332 if (!test_bit(In_sync, &r->flags)) {
2333 DMINFO("Device %d specified for rebuild; clearing superblock",
2334 r->raid_disk);
2335 rebuilds++;
2336
2337 if (test_bit(FirstUse, &r->flags))
2338 rebuild_and_new++;
2339 }
2340
2341 d++;
2342 }
2343
2344 if (new_devs == rs->raid_disks || !rebuilds) {
2345 /* Replace a broken device */
2346 if (new_devs == rs->raid_disks) {
2347 DMINFO("Superblocks created for new raid set");
2348 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2349 } else if (new_devs != rebuilds &&
2350 new_devs != rs->delta_disks) {
2351 DMERR("New device injected into existing raid set without "
2352 "'delta_disks' or 'rebuild' parameter specified");
2353 return -EINVAL;
2354 }
2355 } else if (new_devs && new_devs != rebuilds) {
2356 DMERR("%u 'rebuild' devices cannot be injected into"
2357 " a raid set with %u other first-time devices",
2358 rebuilds, new_devs);
2359 return -EINVAL;
2360 } else if (rebuilds) {
2361 if (rebuild_and_new && rebuilds != rebuild_and_new) {
2362 DMERR("new device%s provided without 'rebuild'",
2363 new_devs > 1 ? "s" : "");
2364 return -EINVAL;
2365 } else if (!test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) && rs_is_recovering(rs)) {
2366 DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)",
2367 (unsigned long long) mddev->recovery_cp);
2368 return -EINVAL;
2369 } else if (rs_is_reshaping(rs)) {
2370 DMERR("'rebuild' specified while raid set is being reshaped (reshape_position=%llu)",
2371 (unsigned long long) mddev->reshape_position);
2372 return -EINVAL;
2373 }
2374 }
2375
2376 /*
2377 * Now we set the Faulty bit for those devices that are
2378 * recorded in the superblock as failed.
2379 */
2380 sb_retrieve_failed_devices(sb, failed_devices);
2381 rdev_for_each(r, mddev) {
2382 if (test_bit(Journal, &rdev->flags) ||
2383 !r->sb_page)
2384 continue;
2385 sb2 = page_address(r->sb_page);
2386 sb2->failed_devices = 0;
2387 memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices));
2388
2389 /*
2390 * Check for any device re-ordering.
2391 */
2392 if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
2393 role = le32_to_cpu(sb2->array_position);
2394 if (role < 0)
2395 continue;
2396
2397 if (role != r->raid_disk) {
2398 if (rs_is_raid10(rs) && __is_raid10_near(mddev->layout)) {
2399 if (mddev->raid_disks % __raid10_near_copies(mddev->layout) ||
2400 rs->raid_disks % rs->raid10_copies) {
2401 rs->ti->error =
2402 "Cannot change raid10 near set to odd # of devices!";
2403 return -EINVAL;
2404 }
2405
2406 sb2->array_position = cpu_to_le32(r->raid_disk);
2407
2408 } else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) &&
2409 !(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) &&
2410 !rt_is_raid1(rs->raid_type)) {
2411 rs->ti->error = "Cannot change device positions in raid set";
2412 return -EINVAL;
2413 }
2414
2415 DMINFO("raid device #%d now at position #%d", role, r->raid_disk);
2416 }
2417
2418 /*
2419 * Partial recovery is performed on
2420 * returning failed devices.
2421 */
2422 if (test_bit(role, (void *) failed_devices))
2423 set_bit(Faulty, &r->flags);
2424 }
2425 }
2426
2427 return 0;
2428}
2429
2430static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
2431{
2432 struct mddev *mddev = &rs->md;
2433 struct dm_raid_superblock *sb;
2434
2435 if (rs_is_raid0(rs) || !rdev->sb_page || rdev->raid_disk < 0)
2436 return 0;
2437
2438 sb = page_address(rdev->sb_page);
2439
2440 /*
2441 * If mddev->events is not set, we know we have not yet initialized
2442 * the array.
2443 */
2444 if (!mddev->events && super_init_validation(rs, rdev))
2445 return -EINVAL;
2446
2447 if (le32_to_cpu(sb->compat_features) &&
2448 le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
2449 rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
2450 return -EINVAL;
2451 }
2452
2453 if (sb->incompat_features) {
2454 rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet";
2455 return -EINVAL;
2456 }
2457
2458 /* Enable bitmap creation on @rs unless no metadevs or raid0 or journaled raid4/5/6 set. */
2459 mddev->bitmap_info.offset = (rt_is_raid0(rs->raid_type) || rs->journal_dev.dev) ? 0 : to_sector(4096);
2460 mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
2461
2462 if (!test_and_clear_bit(FirstUse, &rdev->flags)) {
2463 /*
2464 * Retrieve rdev size stored in superblock to be prepared for shrink.
2465 * Check extended superblock members are present otherwise the size
2466 * will not be set!
2467 */
2468 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190)
2469 rdev->sectors = le64_to_cpu(sb->sectors);
2470
2471 rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
2472 if (rdev->recovery_offset == MaxSector)
2473 set_bit(In_sync, &rdev->flags);
2474 /*
2475 * If no reshape in progress -> we're recovering single
2476 * disk(s) and have to set the device(s) to out-of-sync
2477 */
2478 else if (!rs_is_reshaping(rs))
2479 clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */
2480 }
2481
2482 /*
2483 * If a device comes back, set it as not In_sync and no longer faulty.
2484 */
2485 if (test_and_clear_bit(Faulty, &rdev->flags)) {
2486 rdev->recovery_offset = 0;
2487 clear_bit(In_sync, &rdev->flags);
2488 rdev->saved_raid_disk = rdev->raid_disk;
2489 }
2490
2491 /* Reshape support -> restore repective data offsets */
2492 rdev->data_offset = le64_to_cpu(sb->data_offset);
2493 rdev->new_data_offset = le64_to_cpu(sb->new_data_offset);
2494
2495 return 0;
2496}
2497
2498/*
2499 * Analyse superblocks and select the freshest.
2500 */
2501static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
2502{
2503 int r;
2504 struct md_rdev *rdev, *freshest;
2505 struct mddev *mddev = &rs->md;
2506
2507 freshest = NULL;
2508 rdev_for_each(rdev, mddev) {
2509 if (test_bit(Journal, &rdev->flags))
2510 continue;
2511
2512 if (!rdev->meta_bdev)
2513 continue;
2514
2515 /* Set superblock offset/size for metadata device. */
2516 rdev->sb_start = 0;
2517 rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
2518 if (rdev->sb_size < sizeof(struct dm_raid_superblock) || rdev->sb_size > PAGE_SIZE) {
2519 DMERR("superblock size of a logical block is no longer valid");
2520 return -EINVAL;
2521 }
2522
2523 /*
2524 * Skipping super_load due to CTR_FLAG_SYNC will cause
2525 * the array to undergo initialization again as
2526 * though it were new. This is the intended effect
2527 * of the "sync" directive.
2528 *
2529 * With reshaping capability added, we must ensure that
2530 * that the "sync" directive is disallowed during the reshape.
2531 */
2532 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
2533 continue;
2534
2535 r = super_load(rdev, freshest);
2536
2537 switch (r) {
2538 case 1:
2539 freshest = rdev;
2540 break;
2541 case 0:
2542 break;
2543 default:
2544 /* This is a failure to read the superblock from the metadata device. */
2545 /*
2546 * We have to keep any raid0 data/metadata device pairs or
2547 * the MD raid0 personality will fail to start the array.
2548 */
2549 if (rs_is_raid0(rs))
2550 continue;
2551
2552 /*
2553 * We keep the dm_devs to be able to emit the device tuple
2554 * properly on the table line in raid_status() (rather than
2555 * mistakenly acting as if '- -' got passed into the constructor).
2556 *
2557 * The rdev has to stay on the same_set list to allow for
2558 * the attempt to restore faulty devices on second resume.
2559 */
2560 rdev->raid_disk = rdev->saved_raid_disk = -1;
2561 break;
2562 }
2563 }
2564
2565 if (!freshest)
2566 return 0;
2567
2568 /*
2569 * Validation of the freshest device provides the source of
2570 * validation for the remaining devices.
2571 */
2572 rs->ti->error = "Unable to assemble array: Invalid superblocks";
2573 if (super_validate(rs, freshest))
2574 return -EINVAL;
2575
2576 if (validate_raid_redundancy(rs)) {
2577 rs->ti->error = "Insufficient redundancy to activate array";
2578 return -EINVAL;
2579 }
2580
2581 rdev_for_each(rdev, mddev)
2582 if (!test_bit(Journal, &rdev->flags) &&
2583 rdev != freshest &&
2584 super_validate(rs, rdev))
2585 return -EINVAL;
2586 return 0;
2587}
2588
2589/*
2590 * Adjust data_offset and new_data_offset on all disk members of @rs
2591 * for out of place reshaping if requested by contructor
2592 *
2593 * We need free space at the beginning of each raid disk for forward
2594 * and at the end for backward reshapes which userspace has to provide
2595 * via remapping/reordering of space.
2596 */
2597static int rs_adjust_data_offsets(struct raid_set *rs)
2598{
2599 sector_t data_offset = 0, new_data_offset = 0;
2600 struct md_rdev *rdev;
2601
2602 /* Constructor did not request data offset change */
2603 if (!test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
2604 if (!rs_is_reshapable(rs))
2605 goto out;
2606
2607 return 0;
2608 }
2609
2610 /* HM FIXME: get In_Sync raid_dev? */
2611 rdev = &rs->dev[0].rdev;
2612
2613 if (rs->delta_disks < 0) {
2614 /*
2615 * Removing disks (reshaping backwards):
2616 *
2617 * - before reshape: data is at offset 0 and free space
2618 * is at end of each component LV
2619 *
2620 * - after reshape: data is at offset rs->data_offset != 0 on each component LV
2621 */
2622 data_offset = 0;
2623 new_data_offset = rs->data_offset;
2624
2625 } else if (rs->delta_disks > 0) {
2626 /*
2627 * Adding disks (reshaping forwards):
2628 *
2629 * - before reshape: data is at offset rs->data_offset != 0 and
2630 * free space is at begin of each component LV
2631 *
2632 * - after reshape: data is at offset 0 on each component LV
2633 */
2634 data_offset = rs->data_offset;
2635 new_data_offset = 0;
2636
2637 } else {
2638 /*
2639 * User space passes in 0 for data offset after having removed reshape space
2640 *
2641 * - or - (data offset != 0)
2642 *
2643 * Changing RAID layout or chunk size -> toggle offsets
2644 *
2645 * - before reshape: data is at offset rs->data_offset 0 and
2646 * free space is at end of each component LV
2647 * -or-
2648 * data is at offset rs->data_offset != 0 and
2649 * free space is at begin of each component LV
2650 *
2651 * - after reshape: data is at offset 0 if it was at offset != 0
2652 * or at offset != 0 if it was at offset 0
2653 * on each component LV
2654 *
2655 */
2656 data_offset = rs->data_offset ? rdev->data_offset : 0;
2657 new_data_offset = data_offset ? 0 : rs->data_offset;
2658 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2659 }
2660
2661 /*
2662 * Make sure we got a minimum amount of free sectors per device
2663 */
2664 if (rs->data_offset &&
2665 to_sector(i_size_read(rdev->bdev->bd_inode)) - rs->md.dev_sectors < MIN_FREE_RESHAPE_SPACE) {
2666 rs->ti->error = data_offset ? "No space for forward reshape" :
2667 "No space for backward reshape";
2668 return -ENOSPC;
2669 }
2670out:
2671 /*
2672 * Raise recovery_cp in case data_offset != 0 to
2673 * avoid false recovery positives in the constructor.
2674 */
2675 if (rs->md.recovery_cp < rs->md.dev_sectors)
2676 rs->md.recovery_cp += rs->dev[0].rdev.data_offset;
2677
2678 /* Adjust data offsets on all rdevs but on any raid4/5/6 journal device */
2679 rdev_for_each(rdev, &rs->md) {
2680 if (!test_bit(Journal, &rdev->flags)) {
2681 rdev->data_offset = data_offset;
2682 rdev->new_data_offset = new_data_offset;
2683 }
2684 }
2685
2686 return 0;
2687}
2688
2689/* Userpace reordered disks -> adjust raid_disk indexes in @rs */
2690static void __reorder_raid_disk_indexes(struct raid_set *rs)
2691{
2692 int i = 0;
2693 struct md_rdev *rdev;
2694
2695 rdev_for_each(rdev, &rs->md) {
2696 if (!test_bit(Journal, &rdev->flags)) {
2697 rdev->raid_disk = i++;
2698 rdev->saved_raid_disk = rdev->new_raid_disk = -1;
2699 }
2700 }
2701}
2702
2703/*
2704 * Setup @rs for takeover by a different raid level
2705 */
2706static int rs_setup_takeover(struct raid_set *rs)
2707{
2708 struct mddev *mddev = &rs->md;
2709 struct md_rdev *rdev;
2710 unsigned int d = mddev->raid_disks = rs->raid_disks;
2711 sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset;
2712
2713 if (rt_is_raid10(rs->raid_type)) {
2714 if (rs_is_raid0(rs)) {
2715 /* Userpace reordered disks -> adjust raid_disk indexes */
2716 __reorder_raid_disk_indexes(rs);
2717
2718 /* raid0 -> raid10_far layout */
2719 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR,
2720 rs->raid10_copies);
2721 } else if (rs_is_raid1(rs))
2722 /* raid1 -> raid10_near layout */
2723 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2724 rs->raid_disks);
2725 else
2726 return -EINVAL;
2727
2728 }
2729
2730 clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2731 mddev->recovery_cp = MaxSector;
2732
2733 while (d--) {
2734 rdev = &rs->dev[d].rdev;
2735
2736 if (test_bit(d, (void *) rs->rebuild_disks)) {
2737 clear_bit(In_sync, &rdev->flags);
2738 clear_bit(Faulty, &rdev->flags);
2739 mddev->recovery_cp = rdev->recovery_offset = 0;
2740 /* Bitmap has to be created when we do an "up" takeover */
2741 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2742 }
2743
2744 rdev->new_data_offset = new_data_offset;
2745 }
2746
2747 return 0;
2748}
2749
2750/* Prepare @rs for reshape */
2751static int rs_prepare_reshape(struct raid_set *rs)
2752{
2753 bool reshape;
2754 struct mddev *mddev = &rs->md;
2755
2756 if (rs_is_raid10(rs)) {
2757 if (rs->raid_disks != mddev->raid_disks &&
2758 __is_raid10_near(mddev->layout) &&
2759 rs->raid10_copies &&
2760 rs->raid10_copies != __raid10_near_copies(mddev->layout)) {
2761 /*
2762 * raid disk have to be multiple of data copies to allow this conversion,
2763 *
2764 * This is actually not a reshape it is a
2765 * rebuild of any additional mirrors per group
2766 */
2767 if (rs->raid_disks % rs->raid10_copies) {
2768 rs->ti->error = "Can't reshape raid10 mirror groups";
2769 return -EINVAL;
2770 }
2771
2772 /* Userpace reordered disks to add/remove mirrors -> adjust raid_disk indexes */
2773 __reorder_raid_disk_indexes(rs);
2774 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2775 rs->raid10_copies);
2776 mddev->new_layout = mddev->layout;
2777 reshape = false;
2778 } else
2779 reshape = true;
2780
2781 } else if (rs_is_raid456(rs))
2782 reshape = true;
2783
2784 else if (rs_is_raid1(rs)) {
2785 if (rs->delta_disks) {
2786 /* Process raid1 via delta_disks */
2787 mddev->degraded = rs->delta_disks < 0 ? -rs->delta_disks : rs->delta_disks;
2788 reshape = true;
2789 } else {
2790 /* Process raid1 without delta_disks */
2791 mddev->raid_disks = rs->raid_disks;
2792 reshape = false;
2793 }
2794 } else {
2795 rs->ti->error = "Called with bogus raid type";
2796 return -EINVAL;
2797 }
2798
2799 if (reshape) {
2800 set_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags);
2801 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2802 } else if (mddev->raid_disks < rs->raid_disks)
2803 /* Create new superblocks and bitmaps, if any new disks */
2804 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2805
2806 return 0;
2807}
2808
2809/* Get reshape sectors from data_offsets or raid set */
2810static sector_t _get_reshape_sectors(struct raid_set *rs)
2811{
2812 struct md_rdev *rdev;
2813 sector_t reshape_sectors = 0;
2814
2815 rdev_for_each(rdev, &rs->md)
2816 if (!test_bit(Journal, &rdev->flags)) {
2817 reshape_sectors = (rdev->data_offset > rdev->new_data_offset) ?
2818 rdev->data_offset - rdev->new_data_offset :
2819 rdev->new_data_offset - rdev->data_offset;
2820 break;
2821 }
2822
2823 return max(reshape_sectors, (sector_t) rs->data_offset);
2824}
2825
2826/*
2827 * Reshape:
2828 * - change raid layout
2829 * - change chunk size
2830 * - add disks
2831 * - remove disks
2832 */
2833static int rs_setup_reshape(struct raid_set *rs)
2834{
2835 int r = 0;
2836 unsigned int cur_raid_devs, d;
2837 sector_t reshape_sectors = _get_reshape_sectors(rs);
2838 struct mddev *mddev = &rs->md;
2839 struct md_rdev *rdev;
2840
2841 mddev->delta_disks = rs->delta_disks;
2842 cur_raid_devs = mddev->raid_disks;
2843
2844 /* Ignore impossible layout change whilst adding/removing disks */
2845 if (mddev->delta_disks &&
2846 mddev->layout != mddev->new_layout) {
2847 DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks);
2848 mddev->new_layout = mddev->layout;
2849 }
2850
2851 /*
2852 * Adjust array size:
2853 *
2854 * - in case of adding disk(s), array size has
2855 * to grow after the disk adding reshape,
2856 * which'll hapen in the event handler;
2857 * reshape will happen forward, so space has to
2858 * be available at the beginning of each disk
2859 *
2860 * - in case of removing disk(s), array size
2861 * has to shrink before starting the reshape,
2862 * which'll happen here;
2863 * reshape will happen backward, so space has to
2864 * be available at the end of each disk
2865 *
2866 * - data_offset and new_data_offset are
2867 * adjusted for aforementioned out of place
2868 * reshaping based on userspace passing in
2869 * the "data_offset <sectors>" key/value
2870 * pair via the constructor
2871 */
2872
2873 /* Add disk(s) */
2874 if (rs->delta_disks > 0) {
2875 /* Prepare disks for check in raid4/5/6/10 {check|start}_reshape */
2876 for (d = cur_raid_devs; d < rs->raid_disks; d++) {
2877 rdev = &rs->dev[d].rdev;
2878 clear_bit(In_sync, &rdev->flags);
2879
2880 /*
2881 * save_raid_disk needs to be -1, or recovery_offset will be set to 0
2882 * by md, which'll store that erroneously in the superblock on reshape
2883 */
2884 rdev->saved_raid_disk = -1;
2885 rdev->raid_disk = d;
2886
2887 rdev->sectors = mddev->dev_sectors;
2888 rdev->recovery_offset = rs_is_raid1(rs) ? 0 : MaxSector;
2889 }
2890
2891 mddev->reshape_backwards = 0; /* adding disk(s) -> forward reshape */
2892
2893 /* Remove disk(s) */
2894 } else if (rs->delta_disks < 0) {
2895 r = rs_set_dev_and_array_sectors(rs, rs->ti->len, true);
2896 mddev->reshape_backwards = 1; /* removing disk(s) -> backward reshape */
2897
2898 /* Change layout and/or chunk size */
2899 } else {
2900 /*
2901 * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size:
2902 *
2903 * keeping number of disks and do layout change ->
2904 *
2905 * toggle reshape_backward depending on data_offset:
2906 *
2907 * - free space upfront -> reshape forward
2908 *
2909 * - free space at the end -> reshape backward
2910 *
2911 *
2912 * This utilizes free reshape space avoiding the need
2913 * for userspace to move (parts of) LV segments in
2914 * case of layout/chunksize change (for disk
2915 * adding/removing reshape space has to be at
2916 * the proper address (see above with delta_disks):
2917 *
2918 * add disk(s) -> begin
2919 * remove disk(s)-> end
2920 */
2921 mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1;
2922 }
2923
2924 /*
2925 * Adjust device size for forward reshape
2926 * because md_finish_reshape() reduces it.
2927 */
2928 if (!mddev->reshape_backwards)
2929 rdev_for_each(rdev, &rs->md)
2930 if (!test_bit(Journal, &rdev->flags))
2931 rdev->sectors += reshape_sectors;
2932
2933 return r;
2934}
2935
2936/*
2937 * If the md resync thread has updated superblock with max reshape position
2938 * at the end of a reshape but not (yet) reset the layout configuration
2939 * changes -> reset the latter.
2940 */
2941static void rs_reset_inconclusive_reshape(struct raid_set *rs)
2942{
2943 if (!rs_is_reshaping(rs) && rs_is_layout_change(rs, true)) {
2944 rs_set_cur(rs);
2945 rs->md.delta_disks = 0;
2946 rs->md.reshape_backwards = 0;
2947 }
2948}
2949
2950/*
2951 * Enable/disable discard support on RAID set depending on
2952 * RAID level and discard properties of underlying RAID members.
2953 */
2954static void configure_discard_support(struct raid_set *rs)
2955{
2956 int i;
2957 bool raid456;
2958 struct dm_target *ti = rs->ti;
2959
2960 /*
2961 * XXX: RAID level 4,5,6 require zeroing for safety.
2962 */
2963 raid456 = rs_is_raid456(rs);
2964
2965 for (i = 0; i < rs->raid_disks; i++) {
2966 struct request_queue *q;
2967
2968 if (!rs->dev[i].rdev.bdev)
2969 continue;
2970
2971 q = bdev_get_queue(rs->dev[i].rdev.bdev);
2972 if (!q || !blk_queue_discard(q))
2973 return;
2974
2975 if (raid456) {
2976 if (!devices_handle_discard_safely) {
2977 DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
2978 DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");
2979 return;
2980 }
2981 }
2982 }
2983
2984 ti->num_discard_bios = 1;
2985}
2986
2987/*
2988 * Construct a RAID0/1/10/4/5/6 mapping:
2989 * Args:
2990 * <raid_type> <#raid_params> <raid_params>{0,} \
2991 * <#raid_devs> [<meta_dev1> <dev1>]{1,}
2992 *
2993 * <raid_params> varies by <raid_type>. See 'parse_raid_params' for
2994 * details on possible <raid_params>.
2995 *
2996 * Userspace is free to initialize the metadata devices, hence the superblocks to
2997 * enforce recreation based on the passed in table parameters.
2998 *
2999 */
3000static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
3001{
3002 int r;
3003 bool resize = false;
3004 struct raid_type *rt;
3005 unsigned int num_raid_params, num_raid_devs;
3006 sector_t sb_array_sectors, rdev_sectors, reshape_sectors;
3007 struct raid_set *rs = NULL;
3008 const char *arg;
3009 struct rs_layout rs_layout;
3010 struct dm_arg_set as = { argc, argv }, as_nrd;
3011 struct dm_arg _args[] = {
3012 { 0, as.argc, "Cannot understand number of raid parameters" },
3013 { 1, 254, "Cannot understand number of raid devices parameters" }
3014 };
3015
3016 arg = dm_shift_arg(&as);
3017 if (!arg) {
3018 ti->error = "No arguments";
3019 return -EINVAL;
3020 }
3021
3022 rt = get_raid_type(arg);
3023 if (!rt) {
3024 ti->error = "Unrecognised raid_type";
3025 return -EINVAL;
3026 }
3027
3028 /* Must have <#raid_params> */
3029 if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error))
3030 return -EINVAL;
3031
3032 /* number of raid device tupples <meta_dev data_dev> */
3033 as_nrd = as;
3034 dm_consume_args(&as_nrd, num_raid_params);
3035 _args[1].max = (as_nrd.argc - 1) / 2;
3036 if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error))
3037 return -EINVAL;
3038
3039 if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) {
3040 ti->error = "Invalid number of supplied raid devices";
3041 return -EINVAL;
3042 }
3043
3044 rs = raid_set_alloc(ti, rt, num_raid_devs);
3045 if (IS_ERR(rs))
3046 return PTR_ERR(rs);
3047
3048 r = parse_raid_params(rs, &as, num_raid_params);
3049 if (r)
3050 goto bad;
3051
3052 r = parse_dev_params(rs, &as);
3053 if (r)
3054 goto bad;
3055
3056 rs->md.sync_super = super_sync;
3057
3058 /*
3059 * Calculate ctr requested array and device sizes to allow
3060 * for superblock analysis needing device sizes defined.
3061 *
3062 * Any existing superblock will overwrite the array and device sizes
3063 */
3064 r = rs_set_dev_and_array_sectors(rs, rs->ti->len, false);
3065 if (r)
3066 goto bad;
3067
3068 /* Memorize just calculated, potentially larger sizes to grow the raid set in preresume */
3069 rs->array_sectors = rs->md.array_sectors;
3070 rs->dev_sectors = rs->md.dev_sectors;
3071
3072 /*
3073 * Backup any new raid set level, layout, ...
3074 * requested to be able to compare to superblock
3075 * members for conversion decisions.
3076 */
3077 rs_config_backup(rs, &rs_layout);
3078
3079 r = analyse_superblocks(ti, rs);
3080 if (r)
3081 goto bad;
3082
3083 /* All in-core metadata now as of current superblocks after calling analyse_superblocks() */
3084 sb_array_sectors = rs->md.array_sectors;
3085 rdev_sectors = __rdev_sectors(rs);
3086 if (!rdev_sectors) {
3087 ti->error = "Invalid rdev size";
3088 r = -EINVAL;
3089 goto bad;
3090 }
3091
3092
3093 reshape_sectors = _get_reshape_sectors(rs);
3094 if (rs->dev_sectors != rdev_sectors) {
3095 resize = (rs->dev_sectors != rdev_sectors - reshape_sectors);
3096 if (rs->dev_sectors > rdev_sectors - reshape_sectors)
3097 set_bit(RT_FLAG_RS_GROW, &rs->runtime_flags);
3098 }
3099
3100 INIT_WORK(&rs->md.event_work, do_table_event);
3101 ti->private = rs;
3102 ti->num_flush_bios = 1;
3103
3104 /* Restore any requested new layout for conversion decision */
3105 rs_config_restore(rs, &rs_layout);
3106
3107 /*
3108 * Now that we have any superblock metadata available,
3109 * check for new, recovering, reshaping, to be taken over,
3110 * to be reshaped or an existing, unchanged raid set to
3111 * run in sequence.
3112 */
3113 if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) {
3114 /* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */
3115 if (rs_is_raid6(rs) &&
3116 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
3117 ti->error = "'nosync' not allowed for new raid6 set";
3118 r = -EINVAL;
3119 goto bad;
3120 }
3121 rs_setup_recovery(rs, 0);
3122 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3123 rs_set_new(rs);
3124 } else if (rs_is_recovering(rs)) {
3125 /* A recovering raid set may be resized */
3126 goto size_check;
3127 } else if (rs_is_reshaping(rs)) {
3128 /* Have to reject size change request during reshape */
3129 if (resize) {
3130 ti->error = "Can't resize a reshaping raid set";
3131 r = -EPERM;
3132 goto bad;
3133 }
3134 /* skip setup rs */
3135 } else if (rs_takeover_requested(rs)) {
3136 if (rs_is_reshaping(rs)) {
3137 ti->error = "Can't takeover a reshaping raid set";
3138 r = -EPERM;
3139 goto bad;
3140 }
3141
3142 /* We can't takeover a journaled raid4/5/6 */
3143 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
3144 ti->error = "Can't takeover a journaled raid4/5/6 set";
3145 r = -EPERM;
3146 goto bad;
3147 }
3148
3149 /*
3150 * If a takeover is needed, userspace sets any additional
3151 * devices to rebuild and we can check for a valid request here.
3152 *
3153 * If acceptible, set the level to the new requested
3154 * one, prohibit requesting recovery, allow the raid
3155 * set to run and store superblocks during resume.
3156 */
3157 r = rs_check_takeover(rs);
3158 if (r)
3159 goto bad;
3160
3161 r = rs_setup_takeover(rs);
3162 if (r)
3163 goto bad;
3164
3165 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3166 /* Takeover ain't recovery, so disable recovery */
3167 rs_setup_recovery(rs, MaxSector);
3168 rs_set_new(rs);
3169 } else if (rs_reshape_requested(rs)) {
3170 /* Only request grow on raid set size extensions, not on reshapes. */
3171 clear_bit(RT_FLAG_RS_GROW, &rs->runtime_flags);
3172
3173 /*
3174 * No need to check for 'ongoing' takeover here, because takeover
3175 * is an instant operation as oposed to an ongoing reshape.
3176 */
3177
3178 /* We can't reshape a journaled raid4/5/6 */
3179 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
3180 ti->error = "Can't reshape a journaled raid4/5/6 set";
3181 r = -EPERM;
3182 goto bad;
3183 }
3184
3185 /* Out-of-place space has to be available to allow for a reshape unless raid1! */
3186 if (reshape_sectors || rs_is_raid1(rs)) {
3187 /*
3188 * We can only prepare for a reshape here, because the
3189 * raid set needs to run to provide the repective reshape
3190 * check functions via its MD personality instance.
3191 *
3192 * So do the reshape check after md_run() succeeded.
3193 */
3194 r = rs_prepare_reshape(rs);
3195 if (r)
3196 goto bad;
3197
3198 /* Reshaping ain't recovery, so disable recovery */
3199 rs_setup_recovery(rs, MaxSector);
3200 }
3201 rs_set_cur(rs);
3202 } else {
3203size_check:
3204 /* May not set recovery when a device rebuild is requested */
3205 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) {
3206 clear_bit(RT_FLAG_RS_GROW, &rs->runtime_flags);
3207 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3208 rs_setup_recovery(rs, MaxSector);
3209 } else if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags)) {
3210 /*
3211 * Set raid set to current size, i.e. size as of
3212 * superblocks to grow to larger size in preresume.
3213 */
3214 r = rs_set_dev_and_array_sectors(rs, sb_array_sectors, false);
3215 if (r)
3216 goto bad;
3217
3218 rs_setup_recovery(rs, rs->md.recovery_cp < rs->md.dev_sectors ? rs->md.recovery_cp : rs->md.dev_sectors);
3219 } else {
3220 /* This is no size change or it is shrinking, update size and record in superblocks */
3221 r = rs_set_dev_and_array_sectors(rs, rs->ti->len, false);
3222 if (r)
3223 goto bad;
3224
3225 if (sb_array_sectors > rs->array_sectors)
3226 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3227 }
3228 rs_set_cur(rs);
3229 }
3230
3231 /* If constructor requested it, change data and new_data offsets */
3232 r = rs_adjust_data_offsets(rs);
3233 if (r)
3234 goto bad;
3235
3236 /* Catch any inconclusive reshape superblock content. */
3237 rs_reset_inconclusive_reshape(rs);
3238
3239 /* Start raid set read-only and assumed clean to change in raid_resume() */
3240 rs->md.ro = 1;
3241 rs->md.in_sync = 1;
3242
3243 /* Keep array frozen until resume. */
3244 set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
3245
3246 /* Has to be held on running the array */
3247 mddev_lock_nointr(&rs->md);
3248 r = md_run(&rs->md);
3249 rs->md.in_sync = 0; /* Assume already marked dirty */
3250 if (r) {
3251 ti->error = "Failed to run raid array";
3252 mddev_unlock(&rs->md);
3253 goto bad;
3254 }
3255
3256 r = md_start(&rs->md);
3257 if (r) {
3258 ti->error = "Failed to start raid array";
3259 mddev_unlock(&rs->md);
3260 goto bad_md_start;
3261 }
3262
3263 /* If raid4/5/6 journal mode explicitly requested (only possible with journal dev) -> set it */
3264 if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
3265 r = r5c_journal_mode_set(&rs->md, rs->journal_dev.mode);
3266 if (r) {
3267 ti->error = "Failed to set raid4/5/6 journal mode";
3268 mddev_unlock(&rs->md);
3269 goto bad_journal_mode_set;
3270 }
3271 }
3272
3273 mddev_suspend(&rs->md);
3274 set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags);
3275
3276 /* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
3277 if (rs_is_raid456(rs)) {
3278 r = rs_set_raid456_stripe_cache(rs);
3279 if (r)
3280 goto bad_stripe_cache;
3281 }
3282
3283 /* Now do an early reshape check */
3284 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
3285 r = rs_check_reshape(rs);
3286 if (r)
3287 goto bad_check_reshape;
3288
3289 /* Restore new, ctr requested layout to perform check */
3290 rs_config_restore(rs, &rs_layout);
3291
3292 if (rs->md.pers->start_reshape) {
3293 r = rs->md.pers->check_reshape(&rs->md);
3294 if (r) {
3295 ti->error = "Reshape check failed";
3296 goto bad_check_reshape;
3297 }
3298 }
3299 }
3300
3301 /* Disable/enable discard support on raid set. */
3302 configure_discard_support(rs);
3303
3304 mddev_unlock(&rs->md);
3305 return 0;
3306
3307bad_md_start:
3308bad_journal_mode_set:
3309bad_stripe_cache:
3310bad_check_reshape:
3311 md_stop(&rs->md);
3312bad:
3313 raid_set_free(rs);
3314
3315 return r;
3316}
3317
3318static void raid_dtr(struct dm_target *ti)
3319{
3320 struct raid_set *rs = ti->private;
3321
3322 md_stop(&rs->md);
3323 raid_set_free(rs);
3324}
3325
3326static int raid_map(struct dm_target *ti, struct bio *bio)
3327{
3328 struct raid_set *rs = ti->private;
3329 struct mddev *mddev = &rs->md;
3330
3331 /*
3332 * If we're reshaping to add disk(s)), ti->len and
3333 * mddev->array_sectors will differ during the process
3334 * (ti->len > mddev->array_sectors), so we have to requeue
3335 * bios with addresses > mddev->array_sectors here or
3336 * there will occur accesses past EOD of the component
3337 * data images thus erroring the raid set.
3338 */
3339 if (unlikely(bio_end_sector(bio) > mddev->array_sectors))
3340 return DM_MAPIO_REQUEUE;
3341
3342 md_handle_request(mddev, bio);
3343
3344 return DM_MAPIO_SUBMITTED;
3345}
3346
3347/* Return sync state string for @state */
3348enum sync_state { st_frozen, st_reshape, st_resync, st_check, st_repair, st_recover, st_idle };
3349static const char *sync_str(enum sync_state state)
3350{
3351 /* Has to be in above sync_state order! */
3352 static const char *sync_strs[] = {
3353 "frozen",
3354 "reshape",
3355 "resync",
3356 "check",
3357 "repair",
3358 "recover",
3359 "idle"
3360 };
3361
3362 return __within_range(state, 0, ARRAY_SIZE(sync_strs) - 1) ? sync_strs[state] : "undef";
3363};
3364
3365/* Return enum sync_state for @mddev derived from @recovery flags */
3366static enum sync_state decipher_sync_action(struct mddev *mddev, unsigned long recovery)
3367{
3368 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
3369 return st_frozen;
3370
3371 /* The MD sync thread can be done with io or be interrupted but still be running */
3372 if (!test_bit(MD_RECOVERY_DONE, &recovery) &&
3373 (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
3374 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery)))) {
3375 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
3376 return st_reshape;
3377
3378 if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
3379 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
3380 return st_resync;
3381 if (test_bit(MD_RECOVERY_CHECK, &recovery))
3382 return st_check;
3383 return st_repair;
3384 }
3385
3386 if (test_bit(MD_RECOVERY_RECOVER, &recovery))
3387 return st_recover;
3388
3389 if (mddev->reshape_position != MaxSector)
3390 return st_reshape;
3391 }
3392
3393 return st_idle;
3394}
3395
3396/*
3397 * Return status string for @rdev
3398 *
3399 * Status characters:
3400 *
3401 * 'D' = Dead/Failed raid set component or raid4/5/6 journal device
3402 * 'a' = Alive but not in-sync raid set component _or_ alive raid4/5/6 'write_back' journal device
3403 * 'A' = Alive and in-sync raid set component _or_ alive raid4/5/6 'write_through' journal device
3404 * '-' = Non-existing device (i.e. uspace passed '- -' into the ctr)
3405 */
3406static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev)
3407{
3408 if (!rdev->bdev)
3409 return "-";
3410 else if (test_bit(Faulty, &rdev->flags))
3411 return "D";
3412 else if (test_bit(Journal, &rdev->flags))
3413 return (rs->journal_dev.mode == R5C_JOURNAL_MODE_WRITE_THROUGH) ? "A" : "a";
3414 else if (test_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags) ||
3415 (!test_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags) &&
3416 !test_bit(In_sync, &rdev->flags)))
3417 return "a";
3418 else
3419 return "A";
3420}
3421
3422/* Helper to return resync/reshape progress for @rs and runtime flags for raid set in sync / resynching */
3423static sector_t rs_get_progress(struct raid_set *rs, unsigned long recovery,
3424 enum sync_state state, sector_t resync_max_sectors)
3425{
3426 sector_t r;
3427 struct mddev *mddev = &rs->md;
3428
3429 clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3430 clear_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
3431
3432 if (rs_is_raid0(rs)) {
3433 r = resync_max_sectors;
3434 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3435
3436 } else {
3437 if (state == st_idle && !test_bit(MD_RECOVERY_INTR, &recovery))
3438 r = mddev->recovery_cp;
3439 else
3440 r = mddev->curr_resync_completed;
3441
3442 if (state == st_idle && r >= resync_max_sectors) {
3443 /*
3444 * Sync complete.
3445 */
3446 /* In case we have finished recovering, the array is in sync. */
3447 if (test_bit(MD_RECOVERY_RECOVER, &recovery))
3448 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3449
3450 } else if (state == st_recover)
3451 /*
3452 * In case we are recovering, the array is not in sync
3453 * and health chars should show the recovering legs.
3454 *
3455 * Already retrieved recovery offset from curr_resync_completed above.
3456 */
3457 ;
3458
3459 else if (state == st_resync || state == st_reshape)
3460 /*
3461 * If "resync/reshape" is occurring, the raid set
3462 * is or may be out of sync hence the health
3463 * characters shall be 'a'.
3464 */
3465 set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
3466
3467 else if (state == st_check || state == st_repair)
3468 /*
3469 * If "check" or "repair" is occurring, the raid set has
3470 * undergone an initial sync and the health characters
3471 * should not be 'a' anymore.
3472 */
3473 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3474
3475 else if (test_bit(MD_RECOVERY_NEEDED, &recovery))
3476 /*
3477 * We are idle and recovery is needed, prevent 'A' chars race
3478 * caused by components still set to in-sync by constructor.
3479 */
3480 set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
3481
3482 else {
3483 /*
3484 * We are idle and the raid set may be doing an initial
3485 * sync, or it may be rebuilding individual components.
3486 * If all the devices are In_sync, then it is the raid set
3487 * that is being initialized.
3488 */
3489 struct md_rdev *rdev;
3490
3491 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3492 rdev_for_each(rdev, mddev)
3493 if (!test_bit(Journal, &rdev->flags) &&
3494 !test_bit(In_sync, &rdev->flags)) {
3495 clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3496 break;
3497 }
3498 }
3499 }
3500
3501 return min(r, resync_max_sectors);
3502}
3503
3504/* Helper to return @dev name or "-" if !@dev */
3505static const char *__get_dev_name(struct dm_dev *dev)
3506{
3507 return dev ? dev->name : "-";
3508}
3509
3510static void raid_status(struct dm_target *ti, status_type_t type,
3511 unsigned int status_flags, char *result, unsigned int maxlen)
3512{
3513 struct raid_set *rs = ti->private;
3514 struct mddev *mddev = &rs->md;
3515 struct r5conf *conf = mddev->private;
3516 int i, max_nr_stripes = conf ? conf->max_nr_stripes : 0;
3517 unsigned long recovery;
3518 unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */
3519 unsigned int sz = 0;
3520 unsigned int rebuild_writemostly_count = 0;
3521 sector_t progress, resync_max_sectors, resync_mismatches;
3522 enum sync_state state;
3523 struct raid_type *rt;
3524
3525 switch (type) {
3526 case STATUSTYPE_INFO:
3527 /* *Should* always succeed */
3528 rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
3529 if (!rt)
3530 return;
3531
3532 DMEMIT("%s %d ", rt->name, mddev->raid_disks);
3533
3534 /* Access most recent mddev properties for status output */
3535 smp_rmb();
3536 /* Get sensible max sectors even if raid set not yet started */
3537 resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ?
3538 mddev->resync_max_sectors : mddev->dev_sectors;
3539 recovery = rs->md.recovery;
3540 state = decipher_sync_action(mddev, recovery);
3541 progress = rs_get_progress(rs, recovery, state, resync_max_sectors);
3542 resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ?
3543 atomic64_read(&mddev->resync_mismatches) : 0;
3544
3545 /* HM FIXME: do we want another state char for raid0? It shows 'D'/'A'/'-' now */
3546 for (i = 0; i < rs->raid_disks; i++)
3547 DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev));
3548
3549 /*
3550 * In-sync/Reshape ratio:
3551 * The in-sync ratio shows the progress of:
3552 * - Initializing the raid set
3553 * - Rebuilding a subset of devices of the raid set
3554 * The user can distinguish between the two by referring
3555 * to the status characters.
3556 *
3557 * The reshape ratio shows the progress of
3558 * changing the raid layout or the number of
3559 * disks of a raid set
3560 */
3561 DMEMIT(" %llu/%llu", (unsigned long long) progress,
3562 (unsigned long long) resync_max_sectors);
3563
3564 /*
3565 * v1.5.0+:
3566 *
3567 * Sync action:
3568 * See Documentation/admin-guide/device-mapper/dm-raid.rst for
3569 * information on each of these states.
3570 */
3571 DMEMIT(" %s", sync_str(state));
3572
3573 /*
3574 * v1.5.0+:
3575 *
3576 * resync_mismatches/mismatch_cnt
3577 * This field shows the number of discrepancies found when
3578 * performing a "check" of the raid set.
3579 */
3580 DMEMIT(" %llu", (unsigned long long) resync_mismatches);
3581
3582 /*
3583 * v1.9.0+:
3584 *
3585 * data_offset (needed for out of space reshaping)
3586 * This field shows the data offset into the data
3587 * image LV where the first stripes data starts.
3588 *
3589 * We keep data_offset equal on all raid disks of the set,
3590 * so retrieving it from the first raid disk is sufficient.
3591 */
3592 DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset);
3593
3594 /*
3595 * v1.10.0+:
3596 */
3597 DMEMIT(" %s", test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ?
3598 __raid_dev_status(rs, &rs->journal_dev.rdev) : "-");
3599 break;
3600
3601 case STATUSTYPE_TABLE:
3602 /* Report the table line string you would use to construct this raid set */
3603
3604 /*
3605 * Count any rebuild or writemostly argument pairs and subtract the
3606 * hweight count being added below of any rebuild and writemostly ctr flags.
3607 */
3608 for (i = 0; i < rs->raid_disks; i++) {
3609 rebuild_writemostly_count += (test_bit(i, (void *) rs->rebuild_disks) ? 2 : 0) +
3610 (test_bit(WriteMostly, &rs->dev[i].rdev.flags) ? 2 : 0);
3611 }
3612 rebuild_writemostly_count -= (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) ? 2 : 0) +
3613 (test_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags) ? 2 : 0);
3614 /* Calculate raid parameter count based on ^ rebuild/writemostly argument counts and ctr flags set. */
3615 raid_param_cnt += rebuild_writemostly_count +
3616 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) +
3617 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2;
3618 /* Emit table line */
3619 /* This has to be in the documented order for userspace! */
3620 DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors);
3621 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
3622 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC));
3623 if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
3624 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC));
3625 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags))
3626 for (i = 0; i < rs->raid_disks; i++)
3627 if (test_bit(i, (void *) rs->rebuild_disks))
3628 DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD), i);
3629 if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags))
3630 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP),
3631 mddev->bitmap_info.daemon_sleep);
3632 if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags))
3633 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE),
3634 mddev->sync_speed_min);
3635 if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags))
3636 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE),
3637 mddev->sync_speed_max);
3638 if (test_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags))
3639 for (i = 0; i < rs->raid_disks; i++)
3640 if (test_bit(WriteMostly, &rs->dev[i].rdev.flags))
3641 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY),
3642 rs->dev[i].rdev.raid_disk);
3643 if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags))
3644 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND),
3645 mddev->bitmap_info.max_write_behind);
3646 if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags))
3647 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE),
3648 max_nr_stripes);
3649 if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags))
3650 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE),
3651 (unsigned long long) to_sector(mddev->bitmap_info.chunksize));
3652 if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags))
3653 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES),
3654 raid10_md_layout_to_copies(mddev->layout));
3655 if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags))
3656 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT),
3657 raid10_md_layout_to_format(mddev->layout));
3658 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags))
3659 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS),
3660 max(rs->delta_disks, mddev->delta_disks));
3661 if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags))
3662 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET),
3663 (unsigned long long) rs->data_offset);
3664 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags))
3665 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV),
3666 __get_dev_name(rs->journal_dev.dev));
3667 if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags))
3668 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE),
3669 md_journal_mode_to_dm_raid(rs->journal_dev.mode));
3670 DMEMIT(" %d", rs->raid_disks);
3671 for (i = 0; i < rs->raid_disks; i++)
3672 DMEMIT(" %s %s", __get_dev_name(rs->dev[i].meta_dev),
3673 __get_dev_name(rs->dev[i].data_dev));
3674 }
3675}
3676
3677static int raid_message(struct dm_target *ti, unsigned int argc, char **argv,
3678 char *result, unsigned maxlen)
3679{
3680 struct raid_set *rs = ti->private;
3681 struct mddev *mddev = &rs->md;
3682
3683 if (!mddev->pers || !mddev->pers->sync_request)
3684 return -EINVAL;
3685
3686 if (!strcasecmp(argv[0], "frozen"))
3687 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3688 else
3689 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3690
3691 if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) {
3692 if (mddev->sync_thread) {
3693 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3694 md_reap_sync_thread(mddev);
3695 }
3696 } else if (decipher_sync_action(mddev, mddev->recovery) != st_idle)
3697 return -EBUSY;
3698 else if (!strcasecmp(argv[0], "resync"))
3699 ; /* MD_RECOVERY_NEEDED set below */
3700 else if (!strcasecmp(argv[0], "recover"))
3701 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3702 else {
3703 if (!strcasecmp(argv[0], "check")) {
3704 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3705 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3706 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3707 } else if (!strcasecmp(argv[0], "repair")) {
3708 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3709 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3710 } else
3711 return -EINVAL;
3712 }
3713 if (mddev->ro == 2) {
3714 /* A write to sync_action is enough to justify
3715 * canceling read-auto mode
3716 */
3717 mddev->ro = 0;
3718 if (!mddev->suspended && mddev->sync_thread)
3719 md_wakeup_thread(mddev->sync_thread);
3720 }
3721 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3722 if (!mddev->suspended && mddev->thread)
3723 md_wakeup_thread(mddev->thread);
3724
3725 return 0;
3726}
3727
3728static int raid_iterate_devices(struct dm_target *ti,
3729 iterate_devices_callout_fn fn, void *data)
3730{
3731 struct raid_set *rs = ti->private;
3732 unsigned int i;
3733 int r = 0;
3734
3735 for (i = 0; !r && i < rs->md.raid_disks; i++)
3736 if (rs->dev[i].data_dev)
3737 r = fn(ti,
3738 rs->dev[i].data_dev,
3739 0, /* No offset on data devs */
3740 rs->md.dev_sectors,
3741 data);
3742
3743 return r;
3744}
3745
3746static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
3747{
3748 struct raid_set *rs = ti->private;
3749 unsigned int chunk_size_bytes = to_bytes(rs->md.chunk_sectors);
3750
3751 blk_limits_io_min(limits, chunk_size_bytes);
3752 blk_limits_io_opt(limits, chunk_size_bytes * mddev_data_stripes(rs));
3753}
3754
3755static void raid_postsuspend(struct dm_target *ti)
3756{
3757 struct raid_set *rs = ti->private;
3758
3759 if (!test_and_set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) {
3760 /* Writes have to be stopped before suspending to avoid deadlocks. */
3761 if (!test_bit(MD_RECOVERY_FROZEN, &rs->md.recovery))
3762 md_stop_writes(&rs->md);
3763
3764 mddev_lock_nointr(&rs->md);
3765 mddev_suspend(&rs->md);
3766 mddev_unlock(&rs->md);
3767 }
3768}
3769
3770static void attempt_restore_of_faulty_devices(struct raid_set *rs)
3771{
3772 int i;
3773 uint64_t cleared_failed_devices[DISKS_ARRAY_ELEMS];
3774 unsigned long flags;
3775 bool cleared = false;
3776 struct dm_raid_superblock *sb;
3777 struct mddev *mddev = &rs->md;
3778 struct md_rdev *r;
3779
3780 /* RAID personalities have to provide hot add/remove methods or we need to bail out. */
3781 if (!mddev->pers || !mddev->pers->hot_add_disk || !mddev->pers->hot_remove_disk)
3782 return;
3783
3784 memset(cleared_failed_devices, 0, sizeof(cleared_failed_devices));
3785
3786 for (i = 0; i < mddev->raid_disks; i++) {
3787 r = &rs->dev[i].rdev;
3788 /* HM FIXME: enhance journal device recovery processing */
3789 if (test_bit(Journal, &r->flags))
3790 continue;
3791
3792 if (test_bit(Faulty, &r->flags) &&
3793 r->meta_bdev && !read_disk_sb(r, r->sb_size, true)) {
3794 DMINFO("Faulty %s device #%d has readable super block."
3795 " Attempting to revive it.",
3796 rs->raid_type->name, i);
3797
3798 /*
3799 * Faulty bit may be set, but sometimes the array can
3800 * be suspended before the personalities can respond
3801 * by removing the device from the array (i.e. calling
3802 * 'hot_remove_disk'). If they haven't yet removed
3803 * the failed device, its 'raid_disk' number will be
3804 * '>= 0' - meaning we must call this function
3805 * ourselves.
3806 */
3807 flags = r->flags;
3808 clear_bit(In_sync, &r->flags); /* Mandatory for hot remove. */
3809 if (r->raid_disk >= 0) {
3810 if (mddev->pers->hot_remove_disk(mddev, r)) {
3811 /* Failed to revive this device, try next */
3812 r->flags = flags;
3813 continue;
3814 }
3815 } else
3816 r->raid_disk = r->saved_raid_disk = i;
3817
3818 clear_bit(Faulty, &r->flags);
3819 clear_bit(WriteErrorSeen, &r->flags);
3820
3821 if (mddev->pers->hot_add_disk(mddev, r)) {
3822 /* Failed to revive this device, try next */
3823 r->raid_disk = r->saved_raid_disk = -1;
3824 r->flags = flags;
3825 } else {
3826 clear_bit(In_sync, &r->flags);
3827 r->recovery_offset = 0;
3828 set_bit(i, (void *) cleared_failed_devices);
3829 cleared = true;
3830 }
3831 }
3832 }
3833
3834 /* If any failed devices could be cleared, update all sbs failed_devices bits */
3835 if (cleared) {
3836 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
3837
3838 rdev_for_each(r, &rs->md) {
3839 if (test_bit(Journal, &r->flags))
3840 continue;
3841
3842 sb = page_address(r->sb_page);
3843 sb_retrieve_failed_devices(sb, failed_devices);
3844
3845 for (i = 0; i < DISKS_ARRAY_ELEMS; i++)
3846 failed_devices[i] &= ~cleared_failed_devices[i];
3847
3848 sb_update_failed_devices(sb, failed_devices);
3849 }
3850 }
3851}
3852
3853static int __load_dirty_region_bitmap(struct raid_set *rs)
3854{
3855 int r = 0;
3856
3857 /* Try loading the bitmap unless "raid0", which does not have one */
3858 if (!rs_is_raid0(rs) &&
3859 !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) {
3860 r = md_bitmap_load(&rs->md);
3861 if (r)
3862 DMERR("Failed to load bitmap");
3863 }
3864
3865 return r;
3866}
3867
3868/* Enforce updating all superblocks */
3869static void rs_update_sbs(struct raid_set *rs)
3870{
3871 struct mddev *mddev = &rs->md;
3872 int ro = mddev->ro;
3873
3874 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3875 mddev->ro = 0;
3876 md_update_sb(mddev, 1);
3877 mddev->ro = ro;
3878}
3879
3880/*
3881 * Reshape changes raid algorithm of @rs to new one within personality
3882 * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes
3883 * disks from a raid set thus growing/shrinking it or resizes the set
3884 *
3885 * Call mddev_lock_nointr() before!
3886 */
3887static int rs_start_reshape(struct raid_set *rs)
3888{
3889 int r;
3890 struct mddev *mddev = &rs->md;
3891 struct md_personality *pers = mddev->pers;
3892
3893 /* Don't allow the sync thread to work until the table gets reloaded. */
3894 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
3895
3896 r = rs_setup_reshape(rs);
3897 if (r)
3898 return r;
3899
3900 /*
3901 * Check any reshape constraints enforced by the personalility
3902 *
3903 * May as well already kick the reshape off so that * pers->start_reshape() becomes optional.
3904 */
3905 r = pers->check_reshape(mddev);
3906 if (r) {
3907 rs->ti->error = "pers->check_reshape() failed";
3908 return r;
3909 }
3910
3911 /*
3912 * Personality may not provide start reshape method in which
3913 * case check_reshape above has already covered everything
3914 */
3915 if (pers->start_reshape) {
3916 r = pers->start_reshape(mddev);
3917 if (r) {
3918 rs->ti->error = "pers->start_reshape() failed";
3919 return r;
3920 }
3921 }
3922
3923 /*
3924 * Now reshape got set up, update superblocks to
3925 * reflect the fact so that a table reload will
3926 * access proper superblock content in the ctr.
3927 */
3928 rs_update_sbs(rs);
3929
3930 return 0;
3931}
3932
3933static int raid_preresume(struct dm_target *ti)
3934{
3935 int r;
3936 struct raid_set *rs = ti->private;
3937 struct mddev *mddev = &rs->md;
3938
3939 /* This is a resume after a suspend of the set -> it's already started. */
3940 if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags))
3941 return 0;
3942
3943 /*
3944 * The superblocks need to be updated on disk if the
3945 * array is new or new devices got added (thus zeroed
3946 * out by userspace) or __load_dirty_region_bitmap
3947 * will overwrite them in core with old data or fail.
3948 */
3949 if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags))
3950 rs_update_sbs(rs);
3951
3952 /* Load the bitmap from disk unless raid0 */
3953 r = __load_dirty_region_bitmap(rs);
3954 if (r)
3955 return r;
3956
3957 /* We are extending the raid set size, adjust mddev/md_rdev sizes and set capacity. */
3958 if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags)) {
3959 mddev->array_sectors = rs->array_sectors;
3960 mddev->dev_sectors = rs->dev_sectors;
3961 rs_set_rdev_sectors(rs);
3962 rs_set_capacity(rs);
3963 }
3964
3965 /* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) or grown device size */
3966 if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) && mddev->bitmap &&
3967 (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags) ||
3968 (rs->requested_bitmap_chunk_sectors &&
3969 mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)))) {
3970 int chunksize = to_bytes(rs->requested_bitmap_chunk_sectors) ?: mddev->bitmap_info.chunksize;
3971
3972 r = md_bitmap_resize(mddev->bitmap, mddev->dev_sectors, chunksize, 0);
3973 if (r)
3974 DMERR("Failed to resize bitmap");
3975 }
3976
3977 /* Check for any resize/reshape on @rs and adjust/initiate */
3978 /* Be prepared for mddev_resume() in raid_resume() */
3979 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3980 if (mddev->recovery_cp && mddev->recovery_cp < MaxSector) {
3981 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3982 mddev->resync_min = mddev->recovery_cp;
3983 if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags))
3984 mddev->resync_max_sectors = mddev->dev_sectors;
3985 }
3986
3987 /* Check for any reshape request unless new raid set */
3988 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
3989 /* Initiate a reshape. */
3990 rs_set_rdev_sectors(rs);
3991 mddev_lock_nointr(mddev);
3992 r = rs_start_reshape(rs);
3993 mddev_unlock(mddev);
3994 if (r)
3995 DMWARN("Failed to check/start reshape, continuing without change");
3996 r = 0;
3997 }
3998
3999 return r;
4000}
4001
4002static void raid_resume(struct dm_target *ti)
4003{
4004 struct raid_set *rs = ti->private;
4005 struct mddev *mddev = &rs->md;
4006
4007 if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) {
4008 /*
4009 * A secondary resume while the device is active.
4010 * Take this opportunity to check whether any failed
4011 * devices are reachable again.
4012 */
4013 attempt_restore_of_faulty_devices(rs);
4014 }
4015
4016 if (test_and_clear_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) {
4017 /* Only reduce raid set size before running a disk removing reshape. */
4018 if (mddev->delta_disks < 0)
4019 rs_set_capacity(rs);
4020
4021 mddev_lock_nointr(mddev);
4022 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4023 mddev->ro = 0;
4024 mddev->in_sync = 0;
4025 mddev_resume(mddev);
4026 mddev_unlock(mddev);
4027 }
4028}
4029
4030static struct target_type raid_target = {
4031 .name = "raid",
4032 .version = {1, 15, 1},
4033 .module = THIS_MODULE,
4034 .ctr = raid_ctr,
4035 .dtr = raid_dtr,
4036 .map = raid_map,
4037 .status = raid_status,
4038 .message = raid_message,
4039 .iterate_devices = raid_iterate_devices,
4040 .io_hints = raid_io_hints,
4041 .postsuspend = raid_postsuspend,
4042 .preresume = raid_preresume,
4043 .resume = raid_resume,
4044};
4045
4046static int __init dm_raid_init(void)
4047{
4048 DMINFO("Loading target version %u.%u.%u",
4049 raid_target.version[0],
4050 raid_target.version[1],
4051 raid_target.version[2]);
4052 return dm_register_target(&raid_target);
4053}
4054
4055static void __exit dm_raid_exit(void)
4056{
4057 dm_unregister_target(&raid_target);
4058}
4059
4060module_init(dm_raid_init);
4061module_exit(dm_raid_exit);
4062
4063module_param(devices_handle_discard_safely, bool, 0644);
4064MODULE_PARM_DESC(devices_handle_discard_safely,
4065 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
4066
4067MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target");
4068MODULE_ALIAS("dm-raid0");
4069MODULE_ALIAS("dm-raid1");
4070MODULE_ALIAS("dm-raid10");
4071MODULE_ALIAS("dm-raid4");
4072MODULE_ALIAS("dm-raid5");
4073MODULE_ALIAS("dm-raid6");
4074MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
4075MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>");
4076MODULE_LICENSE("GPL");