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1/*
2 * Copyright (C) 2010-2011 Neil Brown
3 * Copyright (C) 2010-2016 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 "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
27static bool devices_handle_discard_safely = false;
28
29/*
30 * The following flags are used by dm-raid.c to set up the array state.
31 * They must be cleared before md_run is called.
32 */
33#define FirstUse 10 /* rdev flag */
34
35struct raid_dev {
36 /*
37 * Two DM devices, one to hold metadata and one to hold the
38 * actual data/parity. The reason for this is to not confuse
39 * ti->len and give more flexibility in altering size and
40 * characteristics.
41 *
42 * While it is possible for this device to be associated
43 * with a different physical device than the data_dev, it
44 * is intended for it to be the same.
45 * |--------- Physical Device ---------|
46 * |- meta_dev -|------ data_dev ------|
47 */
48 struct dm_dev *meta_dev;
49 struct dm_dev *data_dev;
50 struct md_rdev rdev;
51};
52
53/*
54 * Bits for establishing rs->ctr_flags
55 *
56 * 1 = no flag value
57 * 2 = flag with value
58 */
59#define __CTR_FLAG_SYNC 0 /* 1 */ /* Not with raid0! */
60#define __CTR_FLAG_NOSYNC 1 /* 1 */ /* Not with raid0! */
61#define __CTR_FLAG_REBUILD 2 /* 2 */ /* Not with raid0! */
62#define __CTR_FLAG_DAEMON_SLEEP 3 /* 2 */ /* Not with raid0! */
63#define __CTR_FLAG_MIN_RECOVERY_RATE 4 /* 2 */ /* Not with raid0! */
64#define __CTR_FLAG_MAX_RECOVERY_RATE 5 /* 2 */ /* Not with raid0! */
65#define __CTR_FLAG_MAX_WRITE_BEHIND 6 /* 2 */ /* Only with raid1! */
66#define __CTR_FLAG_WRITE_MOSTLY 7 /* 2 */ /* Only with raid1! */
67#define __CTR_FLAG_STRIPE_CACHE 8 /* 2 */ /* Only with raid4/5/6! */
68#define __CTR_FLAG_REGION_SIZE 9 /* 2 */ /* Not with raid0! */
69#define __CTR_FLAG_RAID10_COPIES 10 /* 2 */ /* Only with raid10 */
70#define __CTR_FLAG_RAID10_FORMAT 11 /* 2 */ /* Only with raid10 */
71/* New for v1.9.0 */
72#define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid1/4/5/6/10! */
73#define __CTR_FLAG_DATA_OFFSET 13 /* 2 */ /* Only with reshapable raid4/5/6/10! */
74#define __CTR_FLAG_RAID10_USE_NEAR_SETS 14 /* 2 */ /* Only with raid10! */
75
76/*
77 * Flags for rs->ctr_flags field.
78 */
79#define CTR_FLAG_SYNC (1 << __CTR_FLAG_SYNC)
80#define CTR_FLAG_NOSYNC (1 << __CTR_FLAG_NOSYNC)
81#define CTR_FLAG_REBUILD (1 << __CTR_FLAG_REBUILD)
82#define CTR_FLAG_DAEMON_SLEEP (1 << __CTR_FLAG_DAEMON_SLEEP)
83#define CTR_FLAG_MIN_RECOVERY_RATE (1 << __CTR_FLAG_MIN_RECOVERY_RATE)
84#define CTR_FLAG_MAX_RECOVERY_RATE (1 << __CTR_FLAG_MAX_RECOVERY_RATE)
85#define CTR_FLAG_MAX_WRITE_BEHIND (1 << __CTR_FLAG_MAX_WRITE_BEHIND)
86#define CTR_FLAG_WRITE_MOSTLY (1 << __CTR_FLAG_WRITE_MOSTLY)
87#define CTR_FLAG_STRIPE_CACHE (1 << __CTR_FLAG_STRIPE_CACHE)
88#define CTR_FLAG_REGION_SIZE (1 << __CTR_FLAG_REGION_SIZE)
89#define CTR_FLAG_RAID10_COPIES (1 << __CTR_FLAG_RAID10_COPIES)
90#define CTR_FLAG_RAID10_FORMAT (1 << __CTR_FLAG_RAID10_FORMAT)
91#define CTR_FLAG_DELTA_DISKS (1 << __CTR_FLAG_DELTA_DISKS)
92#define CTR_FLAG_DATA_OFFSET (1 << __CTR_FLAG_DATA_OFFSET)
93#define CTR_FLAG_RAID10_USE_NEAR_SETS (1 << __CTR_FLAG_RAID10_USE_NEAR_SETS)
94
95/*
96 * Definitions of various constructor flags to
97 * be used in checks of valid / invalid flags
98 * per raid level.
99 */
100/* Define all any sync flags */
101#define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)
102
103/* Define flags for options without argument (e.g. 'nosync') */
104#define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \
105 CTR_FLAG_RAID10_USE_NEAR_SETS)
106
107/* Define flags for options with one argument (e.g. 'delta_disks +2') */
108#define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \
109 CTR_FLAG_WRITE_MOSTLY | \
110 CTR_FLAG_DAEMON_SLEEP | \
111 CTR_FLAG_MIN_RECOVERY_RATE | \
112 CTR_FLAG_MAX_RECOVERY_RATE | \
113 CTR_FLAG_MAX_WRITE_BEHIND | \
114 CTR_FLAG_STRIPE_CACHE | \
115 CTR_FLAG_REGION_SIZE | \
116 CTR_FLAG_RAID10_COPIES | \
117 CTR_FLAG_RAID10_FORMAT | \
118 CTR_FLAG_DELTA_DISKS | \
119 CTR_FLAG_DATA_OFFSET)
120
121/* Valid options definitions per raid level... */
122
123/* "raid0" does only accept data offset */
124#define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET)
125
126/* "raid1" does not accept stripe cache, data offset, delta_disks or any raid10 options */
127#define RAID1_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
128 CTR_FLAG_REBUILD | \
129 CTR_FLAG_WRITE_MOSTLY | \
130 CTR_FLAG_DAEMON_SLEEP | \
131 CTR_FLAG_MIN_RECOVERY_RATE | \
132 CTR_FLAG_MAX_RECOVERY_RATE | \
133 CTR_FLAG_MAX_WRITE_BEHIND | \
134 CTR_FLAG_REGION_SIZE | \
135 CTR_FLAG_DELTA_DISKS | \
136 CTR_FLAG_DATA_OFFSET)
137
138/* "raid10" does not accept any raid1 or stripe cache options */
139#define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
140 CTR_FLAG_REBUILD | \
141 CTR_FLAG_DAEMON_SLEEP | \
142 CTR_FLAG_MIN_RECOVERY_RATE | \
143 CTR_FLAG_MAX_RECOVERY_RATE | \
144 CTR_FLAG_REGION_SIZE | \
145 CTR_FLAG_RAID10_COPIES | \
146 CTR_FLAG_RAID10_FORMAT | \
147 CTR_FLAG_DELTA_DISKS | \
148 CTR_FLAG_DATA_OFFSET | \
149 CTR_FLAG_RAID10_USE_NEAR_SETS)
150
151/*
152 * "raid4/5/6" do not accept any raid1 or raid10 specific options
153 *
154 * "raid6" does not accept "nosync", because it is not guaranteed
155 * that both parity and q-syndrome are being written properly with
156 * any writes
157 */
158#define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
159 CTR_FLAG_REBUILD | \
160 CTR_FLAG_DAEMON_SLEEP | \
161 CTR_FLAG_MIN_RECOVERY_RATE | \
162 CTR_FLAG_MAX_RECOVERY_RATE | \
163 CTR_FLAG_STRIPE_CACHE | \
164 CTR_FLAG_REGION_SIZE | \
165 CTR_FLAG_DELTA_DISKS | \
166 CTR_FLAG_DATA_OFFSET)
167
168#define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \
169 CTR_FLAG_REBUILD | \
170 CTR_FLAG_DAEMON_SLEEP | \
171 CTR_FLAG_MIN_RECOVERY_RATE | \
172 CTR_FLAG_MAX_RECOVERY_RATE | \
173 CTR_FLAG_STRIPE_CACHE | \
174 CTR_FLAG_REGION_SIZE | \
175 CTR_FLAG_DELTA_DISKS | \
176 CTR_FLAG_DATA_OFFSET)
177/* ...valid options definitions per raid level */
178
179/*
180 * Flags for rs->runtime_flags field
181 * (RT_FLAG prefix meaning "runtime flag")
182 *
183 * These are all internal and used to define runtime state,
184 * e.g. to prevent another resume from preresume processing
185 * the raid set all over again.
186 */
187#define RT_FLAG_RS_PRERESUMED 0
188#define RT_FLAG_RS_RESUMED 1
189#define RT_FLAG_RS_BITMAP_LOADED 2
190#define RT_FLAG_UPDATE_SBS 3
191#define RT_FLAG_RESHAPE_RS 4
192
193/* Array elements of 64 bit needed for rebuild/failed disk bits */
194#define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8)
195
196/*
197 * raid set level, layout and chunk sectors backup/restore
198 */
199struct rs_layout {
200 int new_level;
201 int new_layout;
202 int new_chunk_sectors;
203};
204
205struct raid_set {
206 struct dm_target *ti;
207
208 uint32_t bitmap_loaded;
209 uint32_t stripe_cache_entries;
210 unsigned long ctr_flags;
211 unsigned long runtime_flags;
212
213 uint64_t rebuild_disks[DISKS_ARRAY_ELEMS];
214
215 int raid_disks;
216 int delta_disks;
217 int data_offset;
218 int raid10_copies;
219 int requested_bitmap_chunk_sectors;
220
221 struct mddev md;
222 struct raid_type *raid_type;
223 struct dm_target_callbacks callbacks;
224
225 struct raid_dev dev[0];
226};
227
228static void rs_config_backup(struct raid_set *rs, struct rs_layout *l)
229{
230 struct mddev *mddev = &rs->md;
231
232 l->new_level = mddev->new_level;
233 l->new_layout = mddev->new_layout;
234 l->new_chunk_sectors = mddev->new_chunk_sectors;
235}
236
237static void rs_config_restore(struct raid_set *rs, struct rs_layout *l)
238{
239 struct mddev *mddev = &rs->md;
240
241 mddev->new_level = l->new_level;
242 mddev->new_layout = l->new_layout;
243 mddev->new_chunk_sectors = l->new_chunk_sectors;
244}
245
246/* raid10 algorithms (i.e. formats) */
247#define ALGORITHM_RAID10_DEFAULT 0
248#define ALGORITHM_RAID10_NEAR 1
249#define ALGORITHM_RAID10_OFFSET 2
250#define ALGORITHM_RAID10_FAR 3
251
252/* Supported raid types and properties. */
253static struct raid_type {
254 const char *name; /* RAID algorithm. */
255 const char *descr; /* Descriptor text for logging. */
256 const unsigned int parity_devs; /* # of parity devices. */
257 const unsigned int minimal_devs;/* minimal # of devices in set. */
258 const unsigned int level; /* RAID level. */
259 const unsigned int algorithm; /* RAID algorithm. */
260} raid_types[] = {
261 {"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */},
262 {"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */},
263 {"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR},
264 {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET},
265 {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR},
266 {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT},
267 {"raid4", "raid4 (dedicated first parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, /* raid4 layout = raid5_0 */
268 {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N},
269 {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
270 {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
271 {"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
272 {"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
273 {"raid6_zr", "raid6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART},
274 {"raid6_nr", "raid6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART},
275 {"raid6_nc", "raid6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE},
276 {"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6},
277 {"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6},
278 {"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6},
279 {"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6},
280 {"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6}
281};
282
283/* True, if @v is in inclusive range [@min, @max] */
284static bool __within_range(long v, long min, long max)
285{
286 return v >= min && v <= max;
287}
288
289/* All table line arguments are defined here */
290static struct arg_name_flag {
291 const unsigned long flag;
292 const char *name;
293} __arg_name_flags[] = {
294 { CTR_FLAG_SYNC, "sync"},
295 { CTR_FLAG_NOSYNC, "nosync"},
296 { CTR_FLAG_REBUILD, "rebuild"},
297 { CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"},
298 { CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"},
299 { CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"},
300 { CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"},
301 { CTR_FLAG_WRITE_MOSTLY, "write_mostly"},
302 { CTR_FLAG_STRIPE_CACHE, "stripe_cache"},
303 { CTR_FLAG_REGION_SIZE, "region_size"},
304 { CTR_FLAG_RAID10_COPIES, "raid10_copies"},
305 { CTR_FLAG_RAID10_FORMAT, "raid10_format"},
306 { CTR_FLAG_DATA_OFFSET, "data_offset"},
307 { CTR_FLAG_DELTA_DISKS, "delta_disks"},
308 { CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"},
309};
310
311/* Return argument name string for given @flag */
312static const char *dm_raid_arg_name_by_flag(const uint32_t flag)
313{
314 if (hweight32(flag) == 1) {
315 struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags);
316
317 while (anf-- > __arg_name_flags)
318 if (flag & anf->flag)
319 return anf->name;
320
321 } else
322 DMERR("%s called with more than one flag!", __func__);
323
324 return NULL;
325}
326
327/*
328 * Bool helpers to test for various raid levels of a raid set.
329 * It's level as reported by the superblock rather than
330 * the requested raid_type passed to the constructor.
331 */
332/* Return true, if raid set in @rs is raid0 */
333static bool rs_is_raid0(struct raid_set *rs)
334{
335 return !rs->md.level;
336}
337
338/* Return true, if raid set in @rs is raid1 */
339static bool rs_is_raid1(struct raid_set *rs)
340{
341 return rs->md.level == 1;
342}
343
344/* Return true, if raid set in @rs is raid10 */
345static bool rs_is_raid10(struct raid_set *rs)
346{
347 return rs->md.level == 10;
348}
349
350/* Return true, if raid set in @rs is level 6 */
351static bool rs_is_raid6(struct raid_set *rs)
352{
353 return rs->md.level == 6;
354}
355
356/* Return true, if raid set in @rs is level 4, 5 or 6 */
357static bool rs_is_raid456(struct raid_set *rs)
358{
359 return __within_range(rs->md.level, 4, 6);
360}
361
362/* Return true, if raid set in @rs is reshapable */
363static bool __is_raid10_far(int layout);
364static bool rs_is_reshapable(struct raid_set *rs)
365{
366 return rs_is_raid456(rs) ||
367 (rs_is_raid10(rs) && !__is_raid10_far(rs->md.new_layout));
368}
369
370/* Return true, if raid set in @rs is recovering */
371static bool rs_is_recovering(struct raid_set *rs)
372{
373 return rs->md.recovery_cp < rs->dev[0].rdev.sectors;
374}
375
376/* Return true, if raid set in @rs is reshaping */
377static bool rs_is_reshaping(struct raid_set *rs)
378{
379 return rs->md.reshape_position != MaxSector;
380}
381
382/*
383 * bool helpers to test for various raid levels of a raid type @rt
384 */
385
386/* Return true, if raid type in @rt is raid0 */
387static bool rt_is_raid0(struct raid_type *rt)
388{
389 return !rt->level;
390}
391
392/* Return true, if raid type in @rt is raid1 */
393static bool rt_is_raid1(struct raid_type *rt)
394{
395 return rt->level == 1;
396}
397
398/* Return true, if raid type in @rt is raid10 */
399static bool rt_is_raid10(struct raid_type *rt)
400{
401 return rt->level == 10;
402}
403
404/* Return true, if raid type in @rt is raid4/5 */
405static bool rt_is_raid45(struct raid_type *rt)
406{
407 return __within_range(rt->level, 4, 5);
408}
409
410/* Return true, if raid type in @rt is raid6 */
411static bool rt_is_raid6(struct raid_type *rt)
412{
413 return rt->level == 6;
414}
415
416/* Return true, if raid type in @rt is raid4/5/6 */
417static bool rt_is_raid456(struct raid_type *rt)
418{
419 return __within_range(rt->level, 4, 6);
420}
421/* END: raid level bools */
422
423/* Return valid ctr flags for the raid level of @rs */
424static unsigned long __valid_flags(struct raid_set *rs)
425{
426 if (rt_is_raid0(rs->raid_type))
427 return RAID0_VALID_FLAGS;
428 else if (rt_is_raid1(rs->raid_type))
429 return RAID1_VALID_FLAGS;
430 else if (rt_is_raid10(rs->raid_type))
431 return RAID10_VALID_FLAGS;
432 else if (rt_is_raid45(rs->raid_type))
433 return RAID45_VALID_FLAGS;
434 else if (rt_is_raid6(rs->raid_type))
435 return RAID6_VALID_FLAGS;
436
437 return 0;
438}
439
440/*
441 * Check for valid flags set on @rs
442 *
443 * Has to be called after parsing of the ctr flags!
444 */
445static int rs_check_for_valid_flags(struct raid_set *rs)
446{
447 if (rs->ctr_flags & ~__valid_flags(rs)) {
448 rs->ti->error = "Invalid flags combination";
449 return -EINVAL;
450 }
451
452 return 0;
453}
454
455/* MD raid10 bit definitions and helpers */
456#define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */
457#define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */
458#define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */
459#define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */
460
461/* Return md raid10 near copies for @layout */
462static unsigned int __raid10_near_copies(int layout)
463{
464 return layout & 0xFF;
465}
466
467/* Return md raid10 far copies for @layout */
468static unsigned int __raid10_far_copies(int layout)
469{
470 return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);
471}
472
473/* Return true if md raid10 offset for @layout */
474static bool __is_raid10_offset(int layout)
475{
476 return !!(layout & RAID10_OFFSET);
477}
478
479/* Return true if md raid10 near for @layout */
480static bool __is_raid10_near(int layout)
481{
482 return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1;
483}
484
485/* Return true if md raid10 far for @layout */
486static bool __is_raid10_far(int layout)
487{
488 return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1;
489}
490
491/* Return md raid10 layout string for @layout */
492static const char *raid10_md_layout_to_format(int layout)
493{
494 /*
495 * Bit 16 stands for "offset"
496 * (i.e. adjacent stripes hold copies)
497 *
498 * Refer to MD's raid10.c for details
499 */
500 if (__is_raid10_offset(layout))
501 return "offset";
502
503 if (__raid10_near_copies(layout) > 1)
504 return "near";
505
506 WARN_ON(__raid10_far_copies(layout) < 2);
507
508 return "far";
509}
510
511/* Return md raid10 algorithm for @name */
512static int raid10_name_to_format(const char *name)
513{
514 if (!strcasecmp(name, "near"))
515 return ALGORITHM_RAID10_NEAR;
516 else if (!strcasecmp(name, "offset"))
517 return ALGORITHM_RAID10_OFFSET;
518 else if (!strcasecmp(name, "far"))
519 return ALGORITHM_RAID10_FAR;
520
521 return -EINVAL;
522}
523
524/* Return md raid10 copies for @layout */
525static unsigned int raid10_md_layout_to_copies(int layout)
526{
527 return max(__raid10_near_copies(layout), __raid10_far_copies(layout));
528}
529
530/* Return md raid10 format id for @format string */
531static int raid10_format_to_md_layout(struct raid_set *rs,
532 unsigned int algorithm,
533 unsigned int copies)
534{
535 unsigned int n = 1, f = 1, r = 0;
536
537 /*
538 * MD resilienece flaw:
539 *
540 * enabling use_far_sets for far/offset formats causes copies
541 * to be colocated on the same devs together with their origins!
542 *
543 * -> disable it for now in the definition above
544 */
545 if (algorithm == ALGORITHM_RAID10_DEFAULT ||
546 algorithm == ALGORITHM_RAID10_NEAR)
547 n = copies;
548
549 else if (algorithm == ALGORITHM_RAID10_OFFSET) {
550 f = copies;
551 r = RAID10_OFFSET;
552 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
553 r |= RAID10_USE_FAR_SETS;
554
555 } else if (algorithm == ALGORITHM_RAID10_FAR) {
556 f = copies;
557 r = !RAID10_OFFSET;
558 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
559 r |= RAID10_USE_FAR_SETS;
560
561 } else
562 return -EINVAL;
563
564 return r | (f << RAID10_FAR_COPIES_SHIFT) | n;
565}
566/* END: MD raid10 bit definitions and helpers */
567
568/* Check for any of the raid10 algorithms */
569static bool __got_raid10(struct raid_type *rtp, const int layout)
570{
571 if (rtp->level == 10) {
572 switch (rtp->algorithm) {
573 case ALGORITHM_RAID10_DEFAULT:
574 case ALGORITHM_RAID10_NEAR:
575 return __is_raid10_near(layout);
576 case ALGORITHM_RAID10_OFFSET:
577 return __is_raid10_offset(layout);
578 case ALGORITHM_RAID10_FAR:
579 return __is_raid10_far(layout);
580 default:
581 break;
582 }
583 }
584
585 return false;
586}
587
588/* Return raid_type for @name */
589static struct raid_type *get_raid_type(const char *name)
590{
591 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
592
593 while (rtp-- > raid_types)
594 if (!strcasecmp(rtp->name, name))
595 return rtp;
596
597 return NULL;
598}
599
600/* Return raid_type for @name based derived from @level and @layout */
601static struct raid_type *get_raid_type_by_ll(const int level, const int layout)
602{
603 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
604
605 while (rtp-- > raid_types) {
606 /* RAID10 special checks based on @layout flags/properties */
607 if (rtp->level == level &&
608 (__got_raid10(rtp, layout) || rtp->algorithm == layout))
609 return rtp;
610 }
611
612 return NULL;
613}
614
615/*
616 * Conditionally change bdev capacity of @rs
617 * in case of a disk add/remove reshape
618 */
619static void rs_set_capacity(struct raid_set *rs)
620{
621 struct mddev *mddev = &rs->md;
622 struct md_rdev *rdev;
623 struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table));
624
625 /*
626 * raid10 sets rdev->sector to the device size, which
627 * is unintended in case of out-of-place reshaping
628 */
629 rdev_for_each(rdev, mddev)
630 rdev->sectors = mddev->dev_sectors;
631
632 set_capacity(gendisk, mddev->array_sectors);
633 revalidate_disk(gendisk);
634}
635
636/*
637 * Set the mddev properties in @rs to the current
638 * ones retrieved from the freshest superblock
639 */
640static void rs_set_cur(struct raid_set *rs)
641{
642 struct mddev *mddev = &rs->md;
643
644 mddev->new_level = mddev->level;
645 mddev->new_layout = mddev->layout;
646 mddev->new_chunk_sectors = mddev->chunk_sectors;
647}
648
649/*
650 * Set the mddev properties in @rs to the new
651 * ones requested by the ctr
652 */
653static void rs_set_new(struct raid_set *rs)
654{
655 struct mddev *mddev = &rs->md;
656
657 mddev->level = mddev->new_level;
658 mddev->layout = mddev->new_layout;
659 mddev->chunk_sectors = mddev->new_chunk_sectors;
660 mddev->raid_disks = rs->raid_disks;
661 mddev->delta_disks = 0;
662}
663
664static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *raid_type,
665 unsigned int raid_devs)
666{
667 unsigned int i;
668 struct raid_set *rs;
669
670 if (raid_devs <= raid_type->parity_devs) {
671 ti->error = "Insufficient number of devices";
672 return ERR_PTR(-EINVAL);
673 }
674
675 rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL);
676 if (!rs) {
677 ti->error = "Cannot allocate raid context";
678 return ERR_PTR(-ENOMEM);
679 }
680
681 mddev_init(&rs->md);
682
683 rs->raid_disks = raid_devs;
684 rs->delta_disks = 0;
685
686 rs->ti = ti;
687 rs->raid_type = raid_type;
688 rs->stripe_cache_entries = 256;
689 rs->md.raid_disks = raid_devs;
690 rs->md.level = raid_type->level;
691 rs->md.new_level = rs->md.level;
692 rs->md.layout = raid_type->algorithm;
693 rs->md.new_layout = rs->md.layout;
694 rs->md.delta_disks = 0;
695 rs->md.recovery_cp = MaxSector;
696
697 for (i = 0; i < raid_devs; i++)
698 md_rdev_init(&rs->dev[i].rdev);
699
700 /*
701 * Remaining items to be initialized by further RAID params:
702 * rs->md.persistent
703 * rs->md.external
704 * rs->md.chunk_sectors
705 * rs->md.new_chunk_sectors
706 * rs->md.dev_sectors
707 */
708
709 return rs;
710}
711
712static void raid_set_free(struct raid_set *rs)
713{
714 int i;
715
716 for (i = 0; i < rs->raid_disks; i++) {
717 if (rs->dev[i].meta_dev)
718 dm_put_device(rs->ti, rs->dev[i].meta_dev);
719 md_rdev_clear(&rs->dev[i].rdev);
720 if (rs->dev[i].data_dev)
721 dm_put_device(rs->ti, rs->dev[i].data_dev);
722 }
723
724 kfree(rs);
725}
726
727/*
728 * For every device we have two words
729 * <meta_dev>: meta device name or '-' if missing
730 * <data_dev>: data device name or '-' if missing
731 *
732 * The following are permitted:
733 * - -
734 * - <data_dev>
735 * <meta_dev> <data_dev>
736 *
737 * The following is not allowed:
738 * <meta_dev> -
739 *
740 * This code parses those words. If there is a failure,
741 * the caller must use raid_set_free() to unwind the operations.
742 */
743static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as)
744{
745 int i;
746 int rebuild = 0;
747 int metadata_available = 0;
748 int r = 0;
749 const char *arg;
750
751 /* Put off the number of raid devices argument to get to dev pairs */
752 arg = dm_shift_arg(as);
753 if (!arg)
754 return -EINVAL;
755
756 for (i = 0; i < rs->raid_disks; i++) {
757 rs->dev[i].rdev.raid_disk = i;
758
759 rs->dev[i].meta_dev = NULL;
760 rs->dev[i].data_dev = NULL;
761
762 /*
763 * There are no offsets, since there is a separate device
764 * for data and metadata.
765 */
766 rs->dev[i].rdev.data_offset = 0;
767 rs->dev[i].rdev.mddev = &rs->md;
768
769 arg = dm_shift_arg(as);
770 if (!arg)
771 return -EINVAL;
772
773 if (strcmp(arg, "-")) {
774 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
775 &rs->dev[i].meta_dev);
776 if (r) {
777 rs->ti->error = "RAID metadata device lookup failure";
778 return r;
779 }
780
781 rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
782 if (!rs->dev[i].rdev.sb_page) {
783 rs->ti->error = "Failed to allocate superblock page";
784 return -ENOMEM;
785 }
786 }
787
788 arg = dm_shift_arg(as);
789 if (!arg)
790 return -EINVAL;
791
792 if (!strcmp(arg, "-")) {
793 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
794 (!rs->dev[i].rdev.recovery_offset)) {
795 rs->ti->error = "Drive designated for rebuild not specified";
796 return -EINVAL;
797 }
798
799 if (rs->dev[i].meta_dev) {
800 rs->ti->error = "No data device supplied with metadata device";
801 return -EINVAL;
802 }
803
804 continue;
805 }
806
807 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
808 &rs->dev[i].data_dev);
809 if (r) {
810 rs->ti->error = "RAID device lookup failure";
811 return r;
812 }
813
814 if (rs->dev[i].meta_dev) {
815 metadata_available = 1;
816 rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
817 }
818 rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
819 list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks);
820 if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
821 rebuild++;
822 }
823
824 if (metadata_available) {
825 rs->md.external = 0;
826 rs->md.persistent = 1;
827 rs->md.major_version = 2;
828 } else if (rebuild && !rs->md.recovery_cp) {
829 /*
830 * Without metadata, we will not be able to tell if the array
831 * is in-sync or not - we must assume it is not. Therefore,
832 * it is impossible to rebuild a drive.
833 *
834 * Even if there is metadata, the on-disk information may
835 * indicate that the array is not in-sync and it will then
836 * fail at that time.
837 *
838 * User could specify 'nosync' option if desperate.
839 */
840 rs->ti->error = "Unable to rebuild drive while array is not in-sync";
841 return -EINVAL;
842 }
843
844 return 0;
845}
846
847/*
848 * validate_region_size
849 * @rs
850 * @region_size: region size in sectors. If 0, pick a size (4MiB default).
851 *
852 * Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
853 * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
854 *
855 * Returns: 0 on success, -EINVAL on failure.
856 */
857static int validate_region_size(struct raid_set *rs, unsigned long region_size)
858{
859 unsigned long min_region_size = rs->ti->len / (1 << 21);
860
861 if (rs_is_raid0(rs))
862 return 0;
863
864 if (!region_size) {
865 /*
866 * Choose a reasonable default. All figures in sectors.
867 */
868 if (min_region_size > (1 << 13)) {
869 /* If not a power of 2, make it the next power of 2 */
870 region_size = roundup_pow_of_two(min_region_size);
871 DMINFO("Choosing default region size of %lu sectors",
872 region_size);
873 } else {
874 DMINFO("Choosing default region size of 4MiB");
875 region_size = 1 << 13; /* sectors */
876 }
877 } else {
878 /*
879 * Validate user-supplied value.
880 */
881 if (region_size > rs->ti->len) {
882 rs->ti->error = "Supplied region size is too large";
883 return -EINVAL;
884 }
885
886 if (region_size < min_region_size) {
887 DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
888 region_size, min_region_size);
889 rs->ti->error = "Supplied region size is too small";
890 return -EINVAL;
891 }
892
893 if (!is_power_of_2(region_size)) {
894 rs->ti->error = "Region size is not a power of 2";
895 return -EINVAL;
896 }
897
898 if (region_size < rs->md.chunk_sectors) {
899 rs->ti->error = "Region size is smaller than the chunk size";
900 return -EINVAL;
901 }
902 }
903
904 /*
905 * Convert sectors to bytes.
906 */
907 rs->md.bitmap_info.chunksize = to_bytes(region_size);
908
909 return 0;
910}
911
912/*
913 * validate_raid_redundancy
914 * @rs
915 *
916 * Determine if there are enough devices in the array that haven't
917 * failed (or are being rebuilt) to form a usable array.
918 *
919 * Returns: 0 on success, -EINVAL on failure.
920 */
921static int validate_raid_redundancy(struct raid_set *rs)
922{
923 unsigned int i, rebuild_cnt = 0;
924 unsigned int rebuilds_per_group = 0, copies;
925 unsigned int group_size, last_group_start;
926
927 for (i = 0; i < rs->md.raid_disks; i++)
928 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) ||
929 !rs->dev[i].rdev.sb_page)
930 rebuild_cnt++;
931
932 switch (rs->raid_type->level) {
933 case 0:
934 break;
935 case 1:
936 if (rebuild_cnt >= rs->md.raid_disks)
937 goto too_many;
938 break;
939 case 4:
940 case 5:
941 case 6:
942 if (rebuild_cnt > rs->raid_type->parity_devs)
943 goto too_many;
944 break;
945 case 10:
946 copies = raid10_md_layout_to_copies(rs->md.new_layout);
947 if (rebuild_cnt < copies)
948 break;
949
950 /*
951 * It is possible to have a higher rebuild count for RAID10,
952 * as long as the failed devices occur in different mirror
953 * groups (i.e. different stripes).
954 *
955 * When checking "near" format, make sure no adjacent devices
956 * have failed beyond what can be handled. In addition to the
957 * simple case where the number of devices is a multiple of the
958 * number of copies, we must also handle cases where the number
959 * of devices is not a multiple of the number of copies.
960 * E.g. dev1 dev2 dev3 dev4 dev5
961 * A A B B C
962 * C D D E E
963 */
964 if (__is_raid10_near(rs->md.new_layout)) {
965 for (i = 0; i < rs->md.raid_disks; i++) {
966 if (!(i % copies))
967 rebuilds_per_group = 0;
968 if ((!rs->dev[i].rdev.sb_page ||
969 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
970 (++rebuilds_per_group >= copies))
971 goto too_many;
972 }
973 break;
974 }
975
976 /*
977 * When checking "far" and "offset" formats, we need to ensure
978 * that the device that holds its copy is not also dead or
979 * being rebuilt. (Note that "far" and "offset" formats only
980 * support two copies right now. These formats also only ever
981 * use the 'use_far_sets' variant.)
982 *
983 * This check is somewhat complicated by the need to account
984 * for arrays that are not a multiple of (far) copies. This
985 * results in the need to treat the last (potentially larger)
986 * set differently.
987 */
988 group_size = (rs->md.raid_disks / copies);
989 last_group_start = (rs->md.raid_disks / group_size) - 1;
990 last_group_start *= group_size;
991 for (i = 0; i < rs->md.raid_disks; i++) {
992 if (!(i % copies) && !(i > last_group_start))
993 rebuilds_per_group = 0;
994 if ((!rs->dev[i].rdev.sb_page ||
995 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
996 (++rebuilds_per_group >= copies))
997 goto too_many;
998 }
999 break;
1000 default:
1001 if (rebuild_cnt)
1002 return -EINVAL;
1003 }
1004
1005 return 0;
1006
1007too_many:
1008 return -EINVAL;
1009}
1010
1011/*
1012 * Possible arguments are...
1013 * <chunk_size> [optional_args]
1014 *
1015 * Argument definitions
1016 * <chunk_size> The number of sectors per disk that
1017 * will form the "stripe"
1018 * [[no]sync] Force or prevent recovery of the
1019 * entire array
1020 * [rebuild <idx>] Rebuild the drive indicated by the index
1021 * [daemon_sleep <ms>] Time between bitmap daemon work to
1022 * clear bits
1023 * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1024 * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1025 * [write_mostly <idx>] Indicate a write mostly drive via index
1026 * [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
1027 * [stripe_cache <sectors>] Stripe cache size for higher RAIDs
1028 * [region_size <sectors>] Defines granularity of bitmap
1029 *
1030 * RAID10-only options:
1031 * [raid10_copies <# copies>] Number of copies. (Default: 2)
1032 * [raid10_format <near|far|offset>] Layout algorithm. (Default: near)
1033 */
1034static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
1035 unsigned int num_raid_params)
1036{
1037 int value, raid10_format = ALGORITHM_RAID10_DEFAULT;
1038 unsigned int raid10_copies = 2;
1039 unsigned int i, write_mostly = 0;
1040 unsigned int region_size = 0;
1041 sector_t max_io_len;
1042 const char *arg, *key;
1043 struct raid_dev *rd;
1044 struct raid_type *rt = rs->raid_type;
1045
1046 arg = dm_shift_arg(as);
1047 num_raid_params--; /* Account for chunk_size argument */
1048
1049 if (kstrtoint(arg, 10, &value) < 0) {
1050 rs->ti->error = "Bad numerical argument given for chunk_size";
1051 return -EINVAL;
1052 }
1053
1054 /*
1055 * First, parse the in-order required arguments
1056 * "chunk_size" is the only argument of this type.
1057 */
1058 if (rt_is_raid1(rt)) {
1059 if (value)
1060 DMERR("Ignoring chunk size parameter for RAID 1");
1061 value = 0;
1062 } else if (!is_power_of_2(value)) {
1063 rs->ti->error = "Chunk size must be a power of 2";
1064 return -EINVAL;
1065 } else if (value < 8) {
1066 rs->ti->error = "Chunk size value is too small";
1067 return -EINVAL;
1068 }
1069
1070 rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
1071
1072 /*
1073 * We set each individual device as In_sync with a completed
1074 * 'recovery_offset'. If there has been a device failure or
1075 * replacement then one of the following cases applies:
1076 *
1077 * 1) User specifies 'rebuild'.
1078 * - Device is reset when param is read.
1079 * 2) A new device is supplied.
1080 * - No matching superblock found, resets device.
1081 * 3) Device failure was transient and returns on reload.
1082 * - Failure noticed, resets device for bitmap replay.
1083 * 4) Device hadn't completed recovery after previous failure.
1084 * - Superblock is read and overrides recovery_offset.
1085 *
1086 * What is found in the superblocks of the devices is always
1087 * authoritative, unless 'rebuild' or '[no]sync' was specified.
1088 */
1089 for (i = 0; i < rs->raid_disks; i++) {
1090 set_bit(In_sync, &rs->dev[i].rdev.flags);
1091 rs->dev[i].rdev.recovery_offset = MaxSector;
1092 }
1093
1094 /*
1095 * Second, parse the unordered optional arguments
1096 */
1097 for (i = 0; i < num_raid_params; i++) {
1098 key = dm_shift_arg(as);
1099 if (!key) {
1100 rs->ti->error = "Not enough raid parameters given";
1101 return -EINVAL;
1102 }
1103
1104 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) {
1105 if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1106 rs->ti->error = "Only one 'nosync' argument allowed";
1107 return -EINVAL;
1108 }
1109 continue;
1110 }
1111 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) {
1112 if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) {
1113 rs->ti->error = "Only one 'sync' argument allowed";
1114 return -EINVAL;
1115 }
1116 continue;
1117 }
1118 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) {
1119 if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
1120 rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed";
1121 return -EINVAL;
1122 }
1123 continue;
1124 }
1125
1126 arg = dm_shift_arg(as);
1127 i++; /* Account for the argument pairs */
1128 if (!arg) {
1129 rs->ti->error = "Wrong number of raid parameters given";
1130 return -EINVAL;
1131 }
1132
1133 /*
1134 * Parameters that take a string value are checked here.
1135 */
1136
1137 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) {
1138 if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) {
1139 rs->ti->error = "Only one 'raid10_format' argument pair allowed";
1140 return -EINVAL;
1141 }
1142 if (!rt_is_raid10(rt)) {
1143 rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type";
1144 return -EINVAL;
1145 }
1146 raid10_format = raid10_name_to_format(arg);
1147 if (raid10_format < 0) {
1148 rs->ti->error = "Invalid 'raid10_format' value given";
1149 return raid10_format;
1150 }
1151 continue;
1152 }
1153
1154 if (kstrtoint(arg, 10, &value) < 0) {
1155 rs->ti->error = "Bad numerical argument given in raid params";
1156 return -EINVAL;
1157 }
1158
1159 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) {
1160 /*
1161 * "rebuild" is being passed in by userspace to provide
1162 * indexes of replaced devices and to set up additional
1163 * devices on raid level takeover.
1164 */
1165 if (!__within_range(value, 0, rs->raid_disks - 1)) {
1166 rs->ti->error = "Invalid rebuild index given";
1167 return -EINVAL;
1168 }
1169
1170 if (test_and_set_bit(value, (void *) rs->rebuild_disks)) {
1171 rs->ti->error = "rebuild for this index already given";
1172 return -EINVAL;
1173 }
1174
1175 rd = rs->dev + value;
1176 clear_bit(In_sync, &rd->rdev.flags);
1177 clear_bit(Faulty, &rd->rdev.flags);
1178 rd->rdev.recovery_offset = 0;
1179 set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags);
1180 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) {
1181 if (!rt_is_raid1(rt)) {
1182 rs->ti->error = "write_mostly option is only valid for RAID1";
1183 return -EINVAL;
1184 }
1185
1186 if (!__within_range(value, 0, rs->md.raid_disks - 1)) {
1187 rs->ti->error = "Invalid write_mostly index given";
1188 return -EINVAL;
1189 }
1190
1191 write_mostly++;
1192 set_bit(WriteMostly, &rs->dev[value].rdev.flags);
1193 set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags);
1194 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) {
1195 if (!rt_is_raid1(rt)) {
1196 rs->ti->error = "max_write_behind option is only valid for RAID1";
1197 return -EINVAL;
1198 }
1199
1200 if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) {
1201 rs->ti->error = "Only one max_write_behind argument pair allowed";
1202 return -EINVAL;
1203 }
1204
1205 /*
1206 * In device-mapper, we specify things in sectors, but
1207 * MD records this value in kB
1208 */
1209 value /= 2;
1210 if (value > COUNTER_MAX) {
1211 rs->ti->error = "Max write-behind limit out of range";
1212 return -EINVAL;
1213 }
1214
1215 rs->md.bitmap_info.max_write_behind = value;
1216 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) {
1217 if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) {
1218 rs->ti->error = "Only one daemon_sleep argument pair allowed";
1219 return -EINVAL;
1220 }
1221 if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
1222 rs->ti->error = "daemon sleep period out of range";
1223 return -EINVAL;
1224 }
1225 rs->md.bitmap_info.daemon_sleep = value;
1226 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) {
1227 /* Userspace passes new data_offset after having extended the the data image LV */
1228 if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
1229 rs->ti->error = "Only one data_offset argument pair allowed";
1230 return -EINVAL;
1231 }
1232 /* Ensure sensible data offset */
1233 if (value < 0 ||
1234 (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) {
1235 rs->ti->error = "Bogus data_offset value";
1236 return -EINVAL;
1237 }
1238 rs->data_offset = value;
1239 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) {
1240 /* Define the +/-# of disks to add to/remove from the given raid set */
1241 if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
1242 rs->ti->error = "Only one delta_disks argument pair allowed";
1243 return -EINVAL;
1244 }
1245 /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */
1246 if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) {
1247 rs->ti->error = "Too many delta_disk requested";
1248 return -EINVAL;
1249 }
1250
1251 rs->delta_disks = value;
1252 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) {
1253 if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) {
1254 rs->ti->error = "Only one stripe_cache argument pair allowed";
1255 return -EINVAL;
1256 }
1257
1258 if (!rt_is_raid456(rt)) {
1259 rs->ti->error = "Inappropriate argument: stripe_cache";
1260 return -EINVAL;
1261 }
1262
1263 rs->stripe_cache_entries = value;
1264 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) {
1265 if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
1266 rs->ti->error = "Only one min_recovery_rate argument pair allowed";
1267 return -EINVAL;
1268 }
1269 if (value > INT_MAX) {
1270 rs->ti->error = "min_recovery_rate out of range";
1271 return -EINVAL;
1272 }
1273 rs->md.sync_speed_min = (int)value;
1274 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) {
1275 if (test_and_set_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) {
1276 rs->ti->error = "Only one max_recovery_rate argument pair allowed";
1277 return -EINVAL;
1278 }
1279 if (value > INT_MAX) {
1280 rs->ti->error = "max_recovery_rate out of range";
1281 return -EINVAL;
1282 }
1283 rs->md.sync_speed_max = (int)value;
1284 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) {
1285 if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) {
1286 rs->ti->error = "Only one region_size argument pair allowed";
1287 return -EINVAL;
1288 }
1289
1290 region_size = value;
1291 rs->requested_bitmap_chunk_sectors = value;
1292 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) {
1293 if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) {
1294 rs->ti->error = "Only one raid10_copies argument pair allowed";
1295 return -EINVAL;
1296 }
1297
1298 if (!__within_range(value, 2, rs->md.raid_disks)) {
1299 rs->ti->error = "Bad value for 'raid10_copies'";
1300 return -EINVAL;
1301 }
1302
1303 raid10_copies = value;
1304 } else {
1305 DMERR("Unable to parse RAID parameter: %s", key);
1306 rs->ti->error = "Unable to parse RAID parameter";
1307 return -EINVAL;
1308 }
1309 }
1310
1311 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) &&
1312 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1313 rs->ti->error = "sync and nosync are mutually exclusive";
1314 return -EINVAL;
1315 }
1316
1317 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) &&
1318 (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ||
1319 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))) {
1320 rs->ti->error = "sync/nosync and rebuild are mutually exclusive";
1321 return -EINVAL;
1322 }
1323
1324 if (write_mostly >= rs->md.raid_disks) {
1325 rs->ti->error = "Can't set all raid1 devices to write_mostly";
1326 return -EINVAL;
1327 }
1328
1329 if (validate_region_size(rs, region_size))
1330 return -EINVAL;
1331
1332 if (rs->md.chunk_sectors)
1333 max_io_len = rs->md.chunk_sectors;
1334 else
1335 max_io_len = region_size;
1336
1337 if (dm_set_target_max_io_len(rs->ti, max_io_len))
1338 return -EINVAL;
1339
1340 if (rt_is_raid10(rt)) {
1341 if (raid10_copies > rs->md.raid_disks) {
1342 rs->ti->error = "Not enough devices to satisfy specification";
1343 return -EINVAL;
1344 }
1345
1346 rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies);
1347 if (rs->md.new_layout < 0) {
1348 rs->ti->error = "Error getting raid10 format";
1349 return rs->md.new_layout;
1350 }
1351
1352 rt = get_raid_type_by_ll(10, rs->md.new_layout);
1353 if (!rt) {
1354 rs->ti->error = "Failed to recognize new raid10 layout";
1355 return -EINVAL;
1356 }
1357
1358 if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT ||
1359 rt->algorithm == ALGORITHM_RAID10_NEAR) &&
1360 test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
1361 rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible";
1362 return -EINVAL;
1363 }
1364 }
1365
1366 rs->raid10_copies = raid10_copies;
1367
1368 /* Assume there are no metadata devices until the drives are parsed */
1369 rs->md.persistent = 0;
1370 rs->md.external = 1;
1371
1372 /* Check, if any invalid ctr arguments have been passed in for the raid level */
1373 return rs_check_for_valid_flags(rs);
1374}
1375
1376/* Set raid4/5/6 cache size */
1377static int rs_set_raid456_stripe_cache(struct raid_set *rs)
1378{
1379 int r;
1380 struct r5conf *conf;
1381 struct mddev *mddev = &rs->md;
1382 uint32_t min_stripes = max(mddev->chunk_sectors, mddev->new_chunk_sectors) / 2;
1383 uint32_t nr_stripes = rs->stripe_cache_entries;
1384
1385 if (!rt_is_raid456(rs->raid_type)) {
1386 rs->ti->error = "Inappropriate raid level; cannot change stripe_cache size";
1387 return -EINVAL;
1388 }
1389
1390 if (nr_stripes < min_stripes) {
1391 DMINFO("Adjusting requested %u stripe cache entries to %u to suit stripe size",
1392 nr_stripes, min_stripes);
1393 nr_stripes = min_stripes;
1394 }
1395
1396 conf = mddev->private;
1397 if (!conf) {
1398 rs->ti->error = "Cannot change stripe_cache size on inactive RAID set";
1399 return -EINVAL;
1400 }
1401
1402 /* Try setting number of stripes in raid456 stripe cache */
1403 if (conf->min_nr_stripes != nr_stripes) {
1404 r = raid5_set_cache_size(mddev, nr_stripes);
1405 if (r) {
1406 rs->ti->error = "Failed to set raid4/5/6 stripe cache size";
1407 return r;
1408 }
1409
1410 DMINFO("%u stripe cache entries", nr_stripes);
1411 }
1412
1413 return 0;
1414}
1415
1416/* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */
1417static unsigned int mddev_data_stripes(struct raid_set *rs)
1418{
1419 return rs->md.raid_disks - rs->raid_type->parity_devs;
1420}
1421
1422/* Return # of data stripes of @rs (i.e. as of ctr) */
1423static unsigned int rs_data_stripes(struct raid_set *rs)
1424{
1425 return rs->raid_disks - rs->raid_type->parity_devs;
1426}
1427
1428/* Calculate the sectors per device and per array used for @rs */
1429static int rs_set_dev_and_array_sectors(struct raid_set *rs, bool use_mddev)
1430{
1431 int delta_disks;
1432 unsigned int data_stripes;
1433 struct mddev *mddev = &rs->md;
1434 struct md_rdev *rdev;
1435 sector_t array_sectors = rs->ti->len, dev_sectors = rs->ti->len;
1436
1437 if (use_mddev) {
1438 delta_disks = mddev->delta_disks;
1439 data_stripes = mddev_data_stripes(rs);
1440 } else {
1441 delta_disks = rs->delta_disks;
1442 data_stripes = rs_data_stripes(rs);
1443 }
1444
1445 /* Special raid1 case w/o delta_disks support (yet) */
1446 if (rt_is_raid1(rs->raid_type))
1447 ;
1448 else if (rt_is_raid10(rs->raid_type)) {
1449 if (rs->raid10_copies < 2 ||
1450 delta_disks < 0) {
1451 rs->ti->error = "Bogus raid10 data copies or delta disks";
1452 return -EINVAL;
1453 }
1454
1455 dev_sectors *= rs->raid10_copies;
1456 if (sector_div(dev_sectors, data_stripes))
1457 goto bad;
1458
1459 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1460 if (sector_div(array_sectors, rs->raid10_copies))
1461 goto bad;
1462
1463 } else if (sector_div(dev_sectors, data_stripes))
1464 goto bad;
1465
1466 else
1467 /* Striped layouts */
1468 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1469
1470 rdev_for_each(rdev, mddev)
1471 rdev->sectors = dev_sectors;
1472
1473 mddev->array_sectors = array_sectors;
1474 mddev->dev_sectors = dev_sectors;
1475
1476 return 0;
1477bad:
1478 rs->ti->error = "Target length not divisible by number of data devices";
1479 return -EINVAL;
1480}
1481
1482/* Setup recovery on @rs */
1483static void __rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors)
1484{
1485 /* raid0 does not recover */
1486 if (rs_is_raid0(rs))
1487 rs->md.recovery_cp = MaxSector;
1488 /*
1489 * A raid6 set has to be recovered either
1490 * completely or for the grown part to
1491 * ensure proper parity and Q-Syndrome
1492 */
1493 else if (rs_is_raid6(rs))
1494 rs->md.recovery_cp = dev_sectors;
1495 /*
1496 * Other raid set types may skip recovery
1497 * depending on the 'nosync' flag.
1498 */
1499 else
1500 rs->md.recovery_cp = test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)
1501 ? MaxSector : dev_sectors;
1502}
1503
1504/* Setup recovery on @rs based on raid type, device size and 'nosync' flag */
1505static void rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors)
1506{
1507 if (!dev_sectors)
1508 /* New raid set or 'sync' flag provided */
1509 __rs_setup_recovery(rs, 0);
1510 else if (dev_sectors == MaxSector)
1511 /* Prevent recovery */
1512 __rs_setup_recovery(rs, MaxSector);
1513 else if (rs->dev[0].rdev.sectors < dev_sectors)
1514 /* Grown raid set */
1515 __rs_setup_recovery(rs, rs->dev[0].rdev.sectors);
1516 else
1517 __rs_setup_recovery(rs, MaxSector);
1518}
1519
1520static void do_table_event(struct work_struct *ws)
1521{
1522 struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
1523
1524 smp_rmb(); /* Make sure we access most actual mddev properties */
1525 if (!rs_is_reshaping(rs))
1526 rs_set_capacity(rs);
1527 dm_table_event(rs->ti->table);
1528}
1529
1530static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
1531{
1532 struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
1533
1534 return mddev_congested(&rs->md, bits);
1535}
1536
1537/*
1538 * Make sure a valid takover (level switch) is being requested on @rs
1539 *
1540 * Conversions of raid sets from one MD personality to another
1541 * have to conform to restrictions which are enforced here.
1542 */
1543static int rs_check_takeover(struct raid_set *rs)
1544{
1545 struct mddev *mddev = &rs->md;
1546 unsigned int near_copies;
1547
1548 if (rs->md.degraded) {
1549 rs->ti->error = "Can't takeover degraded raid set";
1550 return -EPERM;
1551 }
1552
1553 if (rs_is_reshaping(rs)) {
1554 rs->ti->error = "Can't takeover reshaping raid set";
1555 return -EPERM;
1556 }
1557
1558 switch (mddev->level) {
1559 case 0:
1560 /* raid0 -> raid1/5 with one disk */
1561 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1562 mddev->raid_disks == 1)
1563 return 0;
1564
1565 /* raid0 -> raid10 */
1566 if (mddev->new_level == 10 &&
1567 !(rs->raid_disks % mddev->raid_disks))
1568 return 0;
1569
1570 /* raid0 with multiple disks -> raid4/5/6 */
1571 if (__within_range(mddev->new_level, 4, 6) &&
1572 mddev->new_layout == ALGORITHM_PARITY_N &&
1573 mddev->raid_disks > 1)
1574 return 0;
1575
1576 break;
1577
1578 case 10:
1579 /* Can't takeover raid10_offset! */
1580 if (__is_raid10_offset(mddev->layout))
1581 break;
1582
1583 near_copies = __raid10_near_copies(mddev->layout);
1584
1585 /* raid10* -> raid0 */
1586 if (mddev->new_level == 0) {
1587 /* Can takeover raid10_near with raid disks divisable by data copies! */
1588 if (near_copies > 1 &&
1589 !(mddev->raid_disks % near_copies)) {
1590 mddev->raid_disks /= near_copies;
1591 mddev->delta_disks = mddev->raid_disks;
1592 return 0;
1593 }
1594
1595 /* Can takeover raid10_far */
1596 if (near_copies == 1 &&
1597 __raid10_far_copies(mddev->layout) > 1)
1598 return 0;
1599
1600 break;
1601 }
1602
1603 /* raid10_{near,far} -> raid1 */
1604 if (mddev->new_level == 1 &&
1605 max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks)
1606 return 0;
1607
1608 /* raid10_{near,far} with 2 disks -> raid4/5 */
1609 if (__within_range(mddev->new_level, 4, 5) &&
1610 mddev->raid_disks == 2)
1611 return 0;
1612 break;
1613
1614 case 1:
1615 /* raid1 with 2 disks -> raid4/5 */
1616 if (__within_range(mddev->new_level, 4, 5) &&
1617 mddev->raid_disks == 2) {
1618 mddev->degraded = 1;
1619 return 0;
1620 }
1621
1622 /* raid1 -> raid0 */
1623 if (mddev->new_level == 0 &&
1624 mddev->raid_disks == 1)
1625 return 0;
1626
1627 /* raid1 -> raid10 */
1628 if (mddev->new_level == 10)
1629 return 0;
1630 break;
1631
1632 case 4:
1633 /* raid4 -> raid0 */
1634 if (mddev->new_level == 0)
1635 return 0;
1636
1637 /* raid4 -> raid1/5 with 2 disks */
1638 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1639 mddev->raid_disks == 2)
1640 return 0;
1641
1642 /* raid4 -> raid5/6 with parity N */
1643 if (__within_range(mddev->new_level, 5, 6) &&
1644 mddev->layout == ALGORITHM_PARITY_N)
1645 return 0;
1646 break;
1647
1648 case 5:
1649 /* raid5 with parity N -> raid0 */
1650 if (mddev->new_level == 0 &&
1651 mddev->layout == ALGORITHM_PARITY_N)
1652 return 0;
1653
1654 /* raid5 with parity N -> raid4 */
1655 if (mddev->new_level == 4 &&
1656 mddev->layout == ALGORITHM_PARITY_N)
1657 return 0;
1658
1659 /* raid5 with 2 disks -> raid1/4/10 */
1660 if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) &&
1661 mddev->raid_disks == 2)
1662 return 0;
1663
1664 /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */
1665 if (mddev->new_level == 6 &&
1666 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
1667 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6)))
1668 return 0;
1669 break;
1670
1671 case 6:
1672 /* raid6 with parity N -> raid0 */
1673 if (mddev->new_level == 0 &&
1674 mddev->layout == ALGORITHM_PARITY_N)
1675 return 0;
1676
1677 /* raid6 with parity N -> raid4 */
1678 if (mddev->new_level == 4 &&
1679 mddev->layout == ALGORITHM_PARITY_N)
1680 return 0;
1681
1682 /* raid6_*_n with Q-Syndrome N -> raid5_* */
1683 if (mddev->new_level == 5 &&
1684 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
1685 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC)))
1686 return 0;
1687
1688 default:
1689 break;
1690 }
1691
1692 rs->ti->error = "takeover not possible";
1693 return -EINVAL;
1694}
1695
1696/* True if @rs requested to be taken over */
1697static bool rs_takeover_requested(struct raid_set *rs)
1698{
1699 return rs->md.new_level != rs->md.level;
1700}
1701
1702/* True if @rs is requested to reshape by ctr */
1703static bool rs_reshape_requested(struct raid_set *rs)
1704{
1705 bool change;
1706 struct mddev *mddev = &rs->md;
1707
1708 if (rs_takeover_requested(rs))
1709 return false;
1710
1711 if (!mddev->level)
1712 return false;
1713
1714 change = mddev->new_layout != mddev->layout ||
1715 mddev->new_chunk_sectors != mddev->chunk_sectors ||
1716 rs->delta_disks;
1717
1718 /* Historical case to support raid1 reshape without delta disks */
1719 if (mddev->level == 1) {
1720 if (rs->delta_disks)
1721 return !!rs->delta_disks;
1722
1723 return !change &&
1724 mddev->raid_disks != rs->raid_disks;
1725 }
1726
1727 if (mddev->level == 10)
1728 return change &&
1729 !__is_raid10_far(mddev->new_layout) &&
1730 rs->delta_disks >= 0;
1731
1732 return change;
1733}
1734
1735/* Features */
1736#define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */
1737
1738/* State flags for sb->flags */
1739#define SB_FLAG_RESHAPE_ACTIVE 0x1
1740#define SB_FLAG_RESHAPE_BACKWARDS 0x2
1741
1742/*
1743 * This structure is never routinely used by userspace, unlike md superblocks.
1744 * Devices with this superblock should only ever be accessed via device-mapper.
1745 */
1746#define DM_RAID_MAGIC 0x64526D44
1747struct dm_raid_superblock {
1748 __le32 magic; /* "DmRd" */
1749 __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */
1750
1751 __le32 num_devices; /* Number of devices in this raid set. (Max 64) */
1752 __le32 array_position; /* The position of this drive in the raid set */
1753
1754 __le64 events; /* Incremented by md when superblock updated */
1755 __le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */
1756 /* indicate failures (see extension below) */
1757
1758 /*
1759 * This offset tracks the progress of the repair or replacement of
1760 * an individual drive.
1761 */
1762 __le64 disk_recovery_offset;
1763
1764 /*
1765 * This offset tracks the progress of the initial raid set
1766 * synchronisation/parity calculation.
1767 */
1768 __le64 array_resync_offset;
1769
1770 /*
1771 * raid characteristics
1772 */
1773 __le32 level;
1774 __le32 layout;
1775 __le32 stripe_sectors;
1776
1777 /********************************************************************
1778 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
1779 *
1780 * FEATURE_FLAG_SUPPORTS_V190 in the features member indicates that those exist
1781 */
1782
1783 __le32 flags; /* Flags defining array states for reshaping */
1784
1785 /*
1786 * This offset tracks the progress of a raid
1787 * set reshape in order to be able to restart it
1788 */
1789 __le64 reshape_position;
1790
1791 /*
1792 * These define the properties of the array in case of an interrupted reshape
1793 */
1794 __le32 new_level;
1795 __le32 new_layout;
1796 __le32 new_stripe_sectors;
1797 __le32 delta_disks;
1798
1799 __le64 array_sectors; /* Array size in sectors */
1800
1801 /*
1802 * Sector offsets to data on devices (reshaping).
1803 * Needed to support out of place reshaping, thus
1804 * not writing over any stripes whilst converting
1805 * them from old to new layout
1806 */
1807 __le64 data_offset;
1808 __le64 new_data_offset;
1809
1810 __le64 sectors; /* Used device size in sectors */
1811
1812 /*
1813 * Additonal Bit field of devices indicating failures to support
1814 * up to 256 devices with the 1.9.0 on-disk metadata format
1815 */
1816 __le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1];
1817
1818 __le32 incompat_features; /* Used to indicate any incompatible features */
1819
1820 /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */
1821} __packed;
1822
1823/*
1824 * Check for reshape constraints on raid set @rs:
1825 *
1826 * - reshape function non-existent
1827 * - degraded set
1828 * - ongoing recovery
1829 * - ongoing reshape
1830 *
1831 * Returns 0 if none or -EPERM if given constraint
1832 * and error message reference in @errmsg
1833 */
1834static int rs_check_reshape(struct raid_set *rs)
1835{
1836 struct mddev *mddev = &rs->md;
1837
1838 if (!mddev->pers || !mddev->pers->check_reshape)
1839 rs->ti->error = "Reshape not supported";
1840 else if (mddev->degraded)
1841 rs->ti->error = "Can't reshape degraded raid set";
1842 else if (rs_is_recovering(rs))
1843 rs->ti->error = "Convert request on recovering raid set prohibited";
1844 else if (rs_is_reshaping(rs))
1845 rs->ti->error = "raid set already reshaping!";
1846 else if (!(rs_is_raid1(rs) || rs_is_raid10(rs) || rs_is_raid456(rs)))
1847 rs->ti->error = "Reshaping only supported for raid1/4/5/6/10";
1848 else
1849 return 0;
1850
1851 return -EPERM;
1852}
1853
1854static int read_disk_sb(struct md_rdev *rdev, int size)
1855{
1856 BUG_ON(!rdev->sb_page);
1857
1858 if (rdev->sb_loaded)
1859 return 0;
1860
1861 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) {
1862 DMERR("Failed to read superblock of device at position %d",
1863 rdev->raid_disk);
1864 md_error(rdev->mddev, rdev);
1865 return -EINVAL;
1866 }
1867
1868 rdev->sb_loaded = 1;
1869
1870 return 0;
1871}
1872
1873static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
1874{
1875 failed_devices[0] = le64_to_cpu(sb->failed_devices);
1876 memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices));
1877
1878 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
1879 int i = ARRAY_SIZE(sb->extended_failed_devices);
1880
1881 while (i--)
1882 failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]);
1883 }
1884}
1885
1886static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
1887{
1888 int i = ARRAY_SIZE(sb->extended_failed_devices);
1889
1890 sb->failed_devices = cpu_to_le64(failed_devices[0]);
1891 while (i--)
1892 sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]);
1893}
1894
1895/*
1896 * Synchronize the superblock members with the raid set properties
1897 *
1898 * All superblock data is little endian.
1899 */
1900static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
1901{
1902 bool update_failed_devices = false;
1903 unsigned int i;
1904 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
1905 struct dm_raid_superblock *sb;
1906 struct raid_set *rs = container_of(mddev, struct raid_set, md);
1907
1908 /* No metadata device, no superblock */
1909 if (!rdev->meta_bdev)
1910 return;
1911
1912 BUG_ON(!rdev->sb_page);
1913
1914 sb = page_address(rdev->sb_page);
1915
1916 sb_retrieve_failed_devices(sb, failed_devices);
1917
1918 for (i = 0; i < rs->raid_disks; i++)
1919 if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) {
1920 update_failed_devices = true;
1921 set_bit(i, (void *) failed_devices);
1922 }
1923
1924 if (update_failed_devices)
1925 sb_update_failed_devices(sb, failed_devices);
1926
1927 sb->magic = cpu_to_le32(DM_RAID_MAGIC);
1928 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
1929
1930 sb->num_devices = cpu_to_le32(mddev->raid_disks);
1931 sb->array_position = cpu_to_le32(rdev->raid_disk);
1932
1933 sb->events = cpu_to_le64(mddev->events);
1934
1935 sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
1936 sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
1937
1938 sb->level = cpu_to_le32(mddev->level);
1939 sb->layout = cpu_to_le32(mddev->layout);
1940 sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
1941
1942 sb->new_level = cpu_to_le32(mddev->new_level);
1943 sb->new_layout = cpu_to_le32(mddev->new_layout);
1944 sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors);
1945
1946 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1947
1948 smp_rmb(); /* Make sure we access most recent reshape position */
1949 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1950 if (le64_to_cpu(sb->reshape_position) != MaxSector) {
1951 /* Flag ongoing reshape */
1952 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE);
1953
1954 if (mddev->delta_disks < 0 || mddev->reshape_backwards)
1955 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS);
1956 } else {
1957 /* Clear reshape flags */
1958 sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS));
1959 }
1960
1961 sb->array_sectors = cpu_to_le64(mddev->array_sectors);
1962 sb->data_offset = cpu_to_le64(rdev->data_offset);
1963 sb->new_data_offset = cpu_to_le64(rdev->new_data_offset);
1964 sb->sectors = cpu_to_le64(rdev->sectors);
1965 sb->incompat_features = cpu_to_le32(0);
1966
1967 /* Zero out the rest of the payload after the size of the superblock */
1968 memset(sb + 1, 0, rdev->sb_size - sizeof(*sb));
1969}
1970
1971/*
1972 * super_load
1973 *
1974 * This function creates a superblock if one is not found on the device
1975 * and will decide which superblock to use if there's a choice.
1976 *
1977 * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
1978 */
1979static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
1980{
1981 int r;
1982 struct dm_raid_superblock *sb;
1983 struct dm_raid_superblock *refsb;
1984 uint64_t events_sb, events_refsb;
1985
1986 rdev->sb_start = 0;
1987 rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
1988 if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) {
1989 DMERR("superblock size of a logical block is no longer valid");
1990 return -EINVAL;
1991 }
1992
1993 r = read_disk_sb(rdev, rdev->sb_size);
1994 if (r)
1995 return r;
1996
1997 sb = page_address(rdev->sb_page);
1998
1999 /*
2000 * Two cases that we want to write new superblocks and rebuild:
2001 * 1) New device (no matching magic number)
2002 * 2) Device specified for rebuild (!In_sync w/ offset == 0)
2003 */
2004 if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
2005 (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
2006 super_sync(rdev->mddev, rdev);
2007
2008 set_bit(FirstUse, &rdev->flags);
2009 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
2010
2011 /* Force writing of superblocks to disk */
2012 set_bit(MD_SB_CHANGE_DEVS, &rdev->mddev->sb_flags);
2013
2014 /* Any superblock is better than none, choose that if given */
2015 return refdev ? 0 : 1;
2016 }
2017
2018 if (!refdev)
2019 return 1;
2020
2021 events_sb = le64_to_cpu(sb->events);
2022
2023 refsb = page_address(refdev->sb_page);
2024 events_refsb = le64_to_cpu(refsb->events);
2025
2026 return (events_sb > events_refsb) ? 1 : 0;
2027}
2028
2029static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
2030{
2031 int role;
2032 unsigned int d;
2033 struct mddev *mddev = &rs->md;
2034 uint64_t events_sb;
2035 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
2036 struct dm_raid_superblock *sb;
2037 uint32_t new_devs = 0, rebuild_and_new = 0, rebuilds = 0;
2038 struct md_rdev *r;
2039 struct dm_raid_superblock *sb2;
2040
2041 sb = page_address(rdev->sb_page);
2042 events_sb = le64_to_cpu(sb->events);
2043
2044 /*
2045 * Initialise to 1 if this is a new superblock.
2046 */
2047 mddev->events = events_sb ? : 1;
2048
2049 mddev->reshape_position = MaxSector;
2050
2051 mddev->raid_disks = le32_to_cpu(sb->num_devices);
2052 mddev->level = le32_to_cpu(sb->level);
2053 mddev->layout = le32_to_cpu(sb->layout);
2054 mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors);
2055
2056 /*
2057 * Reshaping is supported, e.g. reshape_position is valid
2058 * in superblock and superblock content is authoritative.
2059 */
2060 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
2061 /* Superblock is authoritative wrt given raid set layout! */
2062 mddev->new_level = le32_to_cpu(sb->new_level);
2063 mddev->new_layout = le32_to_cpu(sb->new_layout);
2064 mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors);
2065 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
2066 mddev->array_sectors = le64_to_cpu(sb->array_sectors);
2067
2068 /* raid was reshaping and got interrupted */
2069 if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) {
2070 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
2071 DMERR("Reshape requested but raid set is still reshaping");
2072 return -EINVAL;
2073 }
2074
2075 if (mddev->delta_disks < 0 ||
2076 (!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS)))
2077 mddev->reshape_backwards = 1;
2078 else
2079 mddev->reshape_backwards = 0;
2080
2081 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
2082 rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout);
2083 }
2084
2085 } else {
2086 /*
2087 * No takeover/reshaping, because we don't have the extended v1.9.0 metadata
2088 */
2089 struct raid_type *rt_cur = get_raid_type_by_ll(mddev->level, mddev->layout);
2090 struct raid_type *rt_new = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
2091
2092 if (rs_takeover_requested(rs)) {
2093 if (rt_cur && rt_new)
2094 DMERR("Takeover raid sets from %s to %s not yet supported by metadata. (raid level change)",
2095 rt_cur->name, rt_new->name);
2096 else
2097 DMERR("Takeover raid sets not yet supported by metadata. (raid level change)");
2098 return -EINVAL;
2099 } else if (rs_reshape_requested(rs)) {
2100 DMERR("Reshaping raid sets not yet supported by metadata. (raid layout change keeping level)");
2101 if (mddev->layout != mddev->new_layout) {
2102 if (rt_cur && rt_new)
2103 DMERR(" current layout %s vs new layout %s",
2104 rt_cur->name, rt_new->name);
2105 else
2106 DMERR(" current layout 0x%X vs new layout 0x%X",
2107 le32_to_cpu(sb->layout), mddev->new_layout);
2108 }
2109 if (mddev->chunk_sectors != mddev->new_chunk_sectors)
2110 DMERR(" current stripe sectors %u vs new stripe sectors %u",
2111 mddev->chunk_sectors, mddev->new_chunk_sectors);
2112 if (rs->delta_disks)
2113 DMERR(" current %u disks vs new %u disks",
2114 mddev->raid_disks, mddev->raid_disks + rs->delta_disks);
2115 if (rs_is_raid10(rs)) {
2116 DMERR(" Old layout: %s w/ %u copies",
2117 raid10_md_layout_to_format(mddev->layout),
2118 raid10_md_layout_to_copies(mddev->layout));
2119 DMERR(" New layout: %s w/ %u copies",
2120 raid10_md_layout_to_format(mddev->new_layout),
2121 raid10_md_layout_to_copies(mddev->new_layout));
2122 }
2123 return -EINVAL;
2124 }
2125
2126 DMINFO("Discovered old metadata format; upgrading to extended metadata format");
2127 }
2128
2129 if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
2130 mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
2131
2132 /*
2133 * During load, we set FirstUse if a new superblock was written.
2134 * There are two reasons we might not have a superblock:
2135 * 1) The raid set is brand new - in which case, all of the
2136 * devices must have their In_sync bit set. Also,
2137 * recovery_cp must be 0, unless forced.
2138 * 2) This is a new device being added to an old raid set
2139 * and the new device needs to be rebuilt - in which
2140 * case the In_sync bit will /not/ be set and
2141 * recovery_cp must be MaxSector.
2142 * 3) This is/are a new device(s) being added to an old
2143 * raid set during takeover to a higher raid level
2144 * to provide capacity for redundancy or during reshape
2145 * to add capacity to grow the raid set.
2146 */
2147 d = 0;
2148 rdev_for_each(r, mddev) {
2149 if (test_bit(FirstUse, &r->flags))
2150 new_devs++;
2151
2152 if (!test_bit(In_sync, &r->flags)) {
2153 DMINFO("Device %d specified for rebuild; clearing superblock",
2154 r->raid_disk);
2155 rebuilds++;
2156
2157 if (test_bit(FirstUse, &r->flags))
2158 rebuild_and_new++;
2159 }
2160
2161 d++;
2162 }
2163
2164 if (new_devs == rs->raid_disks || !rebuilds) {
2165 /* Replace a broken device */
2166 if (new_devs == 1 && !rs->delta_disks)
2167 ;
2168 if (new_devs == rs->raid_disks) {
2169 DMINFO("Superblocks created for new raid set");
2170 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2171 } else if (new_devs != rebuilds &&
2172 new_devs != rs->delta_disks) {
2173 DMERR("New device injected into existing raid set without "
2174 "'delta_disks' or 'rebuild' parameter specified");
2175 return -EINVAL;
2176 }
2177 } else if (new_devs && new_devs != rebuilds) {
2178 DMERR("%u 'rebuild' devices cannot be injected into"
2179 " a raid set with %u other first-time devices",
2180 rebuilds, new_devs);
2181 return -EINVAL;
2182 } else if (rebuilds) {
2183 if (rebuild_and_new && rebuilds != rebuild_and_new) {
2184 DMERR("new device%s provided without 'rebuild'",
2185 new_devs > 1 ? "s" : "");
2186 return -EINVAL;
2187 } else if (rs_is_recovering(rs)) {
2188 DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)",
2189 (unsigned long long) mddev->recovery_cp);
2190 return -EINVAL;
2191 } else if (rs_is_reshaping(rs)) {
2192 DMERR("'rebuild' specified while raid set is being reshaped (reshape_position=%llu)",
2193 (unsigned long long) mddev->reshape_position);
2194 return -EINVAL;
2195 }
2196 }
2197
2198 /*
2199 * Now we set the Faulty bit for those devices that are
2200 * recorded in the superblock as failed.
2201 */
2202 sb_retrieve_failed_devices(sb, failed_devices);
2203 rdev_for_each(r, mddev) {
2204 if (!r->sb_page)
2205 continue;
2206 sb2 = page_address(r->sb_page);
2207 sb2->failed_devices = 0;
2208 memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices));
2209
2210 /*
2211 * Check for any device re-ordering.
2212 */
2213 if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
2214 role = le32_to_cpu(sb2->array_position);
2215 if (role < 0)
2216 continue;
2217
2218 if (role != r->raid_disk) {
2219 if (rs_is_raid10(rs) && __is_raid10_near(mddev->layout)) {
2220 if (mddev->raid_disks % __raid10_near_copies(mddev->layout) ||
2221 rs->raid_disks % rs->raid10_copies) {
2222 rs->ti->error =
2223 "Cannot change raid10 near set to odd # of devices!";
2224 return -EINVAL;
2225 }
2226
2227 sb2->array_position = cpu_to_le32(r->raid_disk);
2228
2229 } else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) &&
2230 !(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) &&
2231 !rt_is_raid1(rs->raid_type)) {
2232 rs->ti->error = "Cannot change device positions in raid set";
2233 return -EINVAL;
2234 }
2235
2236 DMINFO("raid device #%d now at position #%d", role, r->raid_disk);
2237 }
2238
2239 /*
2240 * Partial recovery is performed on
2241 * returning failed devices.
2242 */
2243 if (test_bit(role, (void *) failed_devices))
2244 set_bit(Faulty, &r->flags);
2245 }
2246 }
2247
2248 return 0;
2249}
2250
2251static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
2252{
2253 struct mddev *mddev = &rs->md;
2254 struct dm_raid_superblock *sb;
2255
2256 if (rs_is_raid0(rs) || !rdev->sb_page)
2257 return 0;
2258
2259 sb = page_address(rdev->sb_page);
2260
2261 /*
2262 * If mddev->events is not set, we know we have not yet initialized
2263 * the array.
2264 */
2265 if (!mddev->events && super_init_validation(rs, rdev))
2266 return -EINVAL;
2267
2268 if (le32_to_cpu(sb->compat_features) &&
2269 le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
2270 rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
2271 return -EINVAL;
2272 }
2273
2274 if (sb->incompat_features) {
2275 rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet";
2276 return -EINVAL;
2277 }
2278
2279 /* Enable bitmap creation for RAID levels != 0 */
2280 mddev->bitmap_info.offset = rt_is_raid0(rs->raid_type) ? 0 : to_sector(4096);
2281 rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
2282
2283 if (!test_and_clear_bit(FirstUse, &rdev->flags)) {
2284 /* Retrieve device size stored in superblock to be prepared for shrink */
2285 rdev->sectors = le64_to_cpu(sb->sectors);
2286 rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
2287 if (rdev->recovery_offset == MaxSector)
2288 set_bit(In_sync, &rdev->flags);
2289 /*
2290 * If no reshape in progress -> we're recovering single
2291 * disk(s) and have to set the device(s) to out-of-sync
2292 */
2293 else if (!rs_is_reshaping(rs))
2294 clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */
2295 }
2296
2297 /*
2298 * If a device comes back, set it as not In_sync and no longer faulty.
2299 */
2300 if (test_and_clear_bit(Faulty, &rdev->flags)) {
2301 rdev->recovery_offset = 0;
2302 clear_bit(In_sync, &rdev->flags);
2303 rdev->saved_raid_disk = rdev->raid_disk;
2304 }
2305
2306 /* Reshape support -> restore repective data offsets */
2307 rdev->data_offset = le64_to_cpu(sb->data_offset);
2308 rdev->new_data_offset = le64_to_cpu(sb->new_data_offset);
2309
2310 return 0;
2311}
2312
2313/*
2314 * Analyse superblocks and select the freshest.
2315 */
2316static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
2317{
2318 int r;
2319 struct raid_dev *dev;
2320 struct md_rdev *rdev, *tmp, *freshest;
2321 struct mddev *mddev = &rs->md;
2322
2323 freshest = NULL;
2324 rdev_for_each_safe(rdev, tmp, mddev) {
2325 /*
2326 * Skipping super_load due to CTR_FLAG_SYNC will cause
2327 * the array to undergo initialization again as
2328 * though it were new. This is the intended effect
2329 * of the "sync" directive.
2330 *
2331 * When reshaping capability is added, we must ensure
2332 * that the "sync" directive is disallowed during the
2333 * reshape.
2334 */
2335 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
2336 continue;
2337
2338 if (!rdev->meta_bdev)
2339 continue;
2340
2341 r = super_load(rdev, freshest);
2342
2343 switch (r) {
2344 case 1:
2345 freshest = rdev;
2346 break;
2347 case 0:
2348 break;
2349 default:
2350 /*
2351 * We have to keep any raid0 data/metadata device pairs or
2352 * the MD raid0 personality will fail to start the array.
2353 */
2354 if (rs_is_raid0(rs))
2355 continue;
2356
2357 dev = container_of(rdev, struct raid_dev, rdev);
2358 if (dev->meta_dev)
2359 dm_put_device(ti, dev->meta_dev);
2360
2361 dev->meta_dev = NULL;
2362 rdev->meta_bdev = NULL;
2363
2364 if (rdev->sb_page)
2365 put_page(rdev->sb_page);
2366
2367 rdev->sb_page = NULL;
2368
2369 rdev->sb_loaded = 0;
2370
2371 /*
2372 * We might be able to salvage the data device
2373 * even though the meta device has failed. For
2374 * now, we behave as though '- -' had been
2375 * set for this device in the table.
2376 */
2377 if (dev->data_dev)
2378 dm_put_device(ti, dev->data_dev);
2379
2380 dev->data_dev = NULL;
2381 rdev->bdev = NULL;
2382
2383 list_del(&rdev->same_set);
2384 }
2385 }
2386
2387 if (!freshest)
2388 return 0;
2389
2390 if (validate_raid_redundancy(rs)) {
2391 rs->ti->error = "Insufficient redundancy to activate array";
2392 return -EINVAL;
2393 }
2394
2395 /*
2396 * Validation of the freshest device provides the source of
2397 * validation for the remaining devices.
2398 */
2399 rs->ti->error = "Unable to assemble array: Invalid superblocks";
2400 if (super_validate(rs, freshest))
2401 return -EINVAL;
2402
2403 rdev_for_each(rdev, mddev)
2404 if ((rdev != freshest) && super_validate(rs, rdev))
2405 return -EINVAL;
2406 return 0;
2407}
2408
2409/*
2410 * Adjust data_offset and new_data_offset on all disk members of @rs
2411 * for out of place reshaping if requested by contructor
2412 *
2413 * We need free space at the beginning of each raid disk for forward
2414 * and at the end for backward reshapes which userspace has to provide
2415 * via remapping/reordering of space.
2416 */
2417static int rs_adjust_data_offsets(struct raid_set *rs)
2418{
2419 sector_t data_offset = 0, new_data_offset = 0;
2420 struct md_rdev *rdev;
2421
2422 /* Constructor did not request data offset change */
2423 if (!test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
2424 if (!rs_is_reshapable(rs))
2425 goto out;
2426
2427 return 0;
2428 }
2429
2430 /* HM FIXME: get InSync raid_dev? */
2431 rdev = &rs->dev[0].rdev;
2432
2433 if (rs->delta_disks < 0) {
2434 /*
2435 * Removing disks (reshaping backwards):
2436 *
2437 * - before reshape: data is at offset 0 and free space
2438 * is at end of each component LV
2439 *
2440 * - after reshape: data is at offset rs->data_offset != 0 on each component LV
2441 */
2442 data_offset = 0;
2443 new_data_offset = rs->data_offset;
2444
2445 } else if (rs->delta_disks > 0) {
2446 /*
2447 * Adding disks (reshaping forwards):
2448 *
2449 * - before reshape: data is at offset rs->data_offset != 0 and
2450 * free space is at begin of each component LV
2451 *
2452 * - after reshape: data is at offset 0 on each component LV
2453 */
2454 data_offset = rs->data_offset;
2455 new_data_offset = 0;
2456
2457 } else {
2458 /*
2459 * User space passes in 0 for data offset after having removed reshape space
2460 *
2461 * - or - (data offset != 0)
2462 *
2463 * Changing RAID layout or chunk size -> toggle offsets
2464 *
2465 * - before reshape: data is at offset rs->data_offset 0 and
2466 * free space is at end of each component LV
2467 * -or-
2468 * data is at offset rs->data_offset != 0 and
2469 * free space is at begin of each component LV
2470 *
2471 * - after reshape: data is at offset 0 if it was at offset != 0
2472 * or at offset != 0 if it was at offset 0
2473 * on each component LV
2474 *
2475 */
2476 data_offset = rs->data_offset ? rdev->data_offset : 0;
2477 new_data_offset = data_offset ? 0 : rs->data_offset;
2478 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2479 }
2480
2481 /*
2482 * Make sure we got a minimum amount of free sectors per device
2483 */
2484 if (rs->data_offset &&
2485 to_sector(i_size_read(rdev->bdev->bd_inode)) - rdev->sectors < MIN_FREE_RESHAPE_SPACE) {
2486 rs->ti->error = data_offset ? "No space for forward reshape" :
2487 "No space for backward reshape";
2488 return -ENOSPC;
2489 }
2490out:
2491 /* Adjust data offsets on all rdevs */
2492 rdev_for_each(rdev, &rs->md) {
2493 rdev->data_offset = data_offset;
2494 rdev->new_data_offset = new_data_offset;
2495 }
2496
2497 return 0;
2498}
2499
2500/* Userpace reordered disks -> adjust raid_disk indexes in @rs */
2501static void __reorder_raid_disk_indexes(struct raid_set *rs)
2502{
2503 int i = 0;
2504 struct md_rdev *rdev;
2505
2506 rdev_for_each(rdev, &rs->md) {
2507 rdev->raid_disk = i++;
2508 rdev->saved_raid_disk = rdev->new_raid_disk = -1;
2509 }
2510}
2511
2512/*
2513 * Setup @rs for takeover by a different raid level
2514 */
2515static int rs_setup_takeover(struct raid_set *rs)
2516{
2517 struct mddev *mddev = &rs->md;
2518 struct md_rdev *rdev;
2519 unsigned int d = mddev->raid_disks = rs->raid_disks;
2520 sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset;
2521
2522 if (rt_is_raid10(rs->raid_type)) {
2523 if (mddev->level == 0) {
2524 /* Userpace reordered disks -> adjust raid_disk indexes */
2525 __reorder_raid_disk_indexes(rs);
2526
2527 /* raid0 -> raid10_far layout */
2528 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR,
2529 rs->raid10_copies);
2530 } else if (mddev->level == 1)
2531 /* raid1 -> raid10_near layout */
2532 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2533 rs->raid_disks);
2534 else
2535 return -EINVAL;
2536
2537 }
2538
2539 clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2540 mddev->recovery_cp = MaxSector;
2541
2542 while (d--) {
2543 rdev = &rs->dev[d].rdev;
2544
2545 if (test_bit(d, (void *) rs->rebuild_disks)) {
2546 clear_bit(In_sync, &rdev->flags);
2547 clear_bit(Faulty, &rdev->flags);
2548 mddev->recovery_cp = rdev->recovery_offset = 0;
2549 /* Bitmap has to be created when we do an "up" takeover */
2550 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2551 }
2552
2553 rdev->new_data_offset = new_data_offset;
2554 }
2555
2556 return 0;
2557}
2558
2559/* Prepare @rs for reshape */
2560static int rs_prepare_reshape(struct raid_set *rs)
2561{
2562 bool reshape;
2563 struct mddev *mddev = &rs->md;
2564
2565 if (rs_is_raid10(rs)) {
2566 if (rs->raid_disks != mddev->raid_disks &&
2567 __is_raid10_near(mddev->layout) &&
2568 rs->raid10_copies &&
2569 rs->raid10_copies != __raid10_near_copies(mddev->layout)) {
2570 /*
2571 * raid disk have to be multiple of data copies to allow this conversion,
2572 *
2573 * This is actually not a reshape it is a
2574 * rebuild of any additional mirrors per group
2575 */
2576 if (rs->raid_disks % rs->raid10_copies) {
2577 rs->ti->error = "Can't reshape raid10 mirror groups";
2578 return -EINVAL;
2579 }
2580
2581 /* Userpace reordered disks to add/remove mirrors -> adjust raid_disk indexes */
2582 __reorder_raid_disk_indexes(rs);
2583 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2584 rs->raid10_copies);
2585 mddev->new_layout = mddev->layout;
2586 reshape = false;
2587 } else
2588 reshape = true;
2589
2590 } else if (rs_is_raid456(rs))
2591 reshape = true;
2592
2593 else if (rs_is_raid1(rs)) {
2594 if (rs->delta_disks) {
2595 /* Process raid1 via delta_disks */
2596 mddev->degraded = rs->delta_disks < 0 ? -rs->delta_disks : rs->delta_disks;
2597 reshape = true;
2598 } else {
2599 /* Process raid1 without delta_disks */
2600 mddev->raid_disks = rs->raid_disks;
2601 reshape = false;
2602 }
2603 } else {
2604 rs->ti->error = "Called with bogus raid type";
2605 return -EINVAL;
2606 }
2607
2608 if (reshape) {
2609 set_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags);
2610 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2611 } else if (mddev->raid_disks < rs->raid_disks)
2612 /* Create new superblocks and bitmaps, if any new disks */
2613 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2614
2615 return 0;
2616}
2617
2618/*
2619 *
2620 * - change raid layout
2621 * - change chunk size
2622 * - add disks
2623 * - remove disks
2624 */
2625static int rs_setup_reshape(struct raid_set *rs)
2626{
2627 int r = 0;
2628 unsigned int cur_raid_devs, d;
2629 struct mddev *mddev = &rs->md;
2630 struct md_rdev *rdev;
2631
2632 mddev->delta_disks = rs->delta_disks;
2633 cur_raid_devs = mddev->raid_disks;
2634
2635 /* Ignore impossible layout change whilst adding/removing disks */
2636 if (mddev->delta_disks &&
2637 mddev->layout != mddev->new_layout) {
2638 DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks);
2639 mddev->new_layout = mddev->layout;
2640 }
2641
2642 /*
2643 * Adjust array size:
2644 *
2645 * - in case of adding disks, array size has
2646 * to grow after the disk adding reshape,
2647 * which'll hapen in the event handler;
2648 * reshape will happen forward, so space has to
2649 * be available at the beginning of each disk
2650 *
2651 * - in case of removing disks, array size
2652 * has to shrink before starting the reshape,
2653 * which'll happen here;
2654 * reshape will happen backward, so space has to
2655 * be available at the end of each disk
2656 *
2657 * - data_offset and new_data_offset are
2658 * adjusted for aforementioned out of place
2659 * reshaping based on userspace passing in
2660 * the "data_offset <sectors>" key/value
2661 * pair via the constructor
2662 */
2663
2664 /* Add disk(s) */
2665 if (rs->delta_disks > 0) {
2666 /* Prepare disks for check in raid4/5/6/10 {check|start}_reshape */
2667 for (d = cur_raid_devs; d < rs->raid_disks; d++) {
2668 rdev = &rs->dev[d].rdev;
2669 clear_bit(In_sync, &rdev->flags);
2670
2671 /*
2672 * save_raid_disk needs to be -1, or recovery_offset will be set to 0
2673 * by md, which'll store that erroneously in the superblock on reshape
2674 */
2675 rdev->saved_raid_disk = -1;
2676 rdev->raid_disk = d;
2677
2678 rdev->sectors = mddev->dev_sectors;
2679 rdev->recovery_offset = rs_is_raid1(rs) ? 0 : MaxSector;
2680 }
2681
2682 mddev->reshape_backwards = 0; /* adding disks -> forward reshape */
2683
2684 /* Remove disk(s) */
2685 } else if (rs->delta_disks < 0) {
2686 r = rs_set_dev_and_array_sectors(rs, true);
2687 mddev->reshape_backwards = 1; /* removing disk(s) -> backward reshape */
2688
2689 /* Change layout and/or chunk size */
2690 } else {
2691 /*
2692 * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size:
2693 *
2694 * keeping number of disks and do layout change ->
2695 *
2696 * toggle reshape_backward depending on data_offset:
2697 *
2698 * - free space upfront -> reshape forward
2699 *
2700 * - free space at the end -> reshape backward
2701 *
2702 *
2703 * This utilizes free reshape space avoiding the need
2704 * for userspace to move (parts of) LV segments in
2705 * case of layout/chunksize change (for disk
2706 * adding/removing reshape space has to be at
2707 * the proper address (see above with delta_disks):
2708 *
2709 * add disk(s) -> begin
2710 * remove disk(s)-> end
2711 */
2712 mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1;
2713 }
2714
2715 return r;
2716}
2717
2718/*
2719 * Enable/disable discard support on RAID set depending on
2720 * RAID level and discard properties of underlying RAID members.
2721 */
2722static void configure_discard_support(struct raid_set *rs)
2723{
2724 int i;
2725 bool raid456;
2726 struct dm_target *ti = rs->ti;
2727
2728 /* Assume discards not supported until after checks below. */
2729 ti->discards_supported = false;
2730
2731 /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */
2732 raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6);
2733
2734 for (i = 0; i < rs->raid_disks; i++) {
2735 struct request_queue *q;
2736
2737 if (!rs->dev[i].rdev.bdev)
2738 continue;
2739
2740 q = bdev_get_queue(rs->dev[i].rdev.bdev);
2741 if (!q || !blk_queue_discard(q))
2742 return;
2743
2744 if (raid456) {
2745 if (!q->limits.discard_zeroes_data)
2746 return;
2747 if (!devices_handle_discard_safely) {
2748 DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
2749 DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");
2750 return;
2751 }
2752 }
2753 }
2754
2755 /* All RAID members properly support discards */
2756 ti->discards_supported = true;
2757
2758 /*
2759 * RAID1 and RAID10 personalities require bio splitting,
2760 * RAID0/4/5/6 don't and process large discard bios properly.
2761 */
2762 ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10);
2763 ti->num_discard_bios = 1;
2764}
2765
2766/*
2767 * Construct a RAID0/1/10/4/5/6 mapping:
2768 * Args:
2769 * <raid_type> <#raid_params> <raid_params>{0,} \
2770 * <#raid_devs> [<meta_dev1> <dev1>]{1,}
2771 *
2772 * <raid_params> varies by <raid_type>. See 'parse_raid_params' for
2773 * details on possible <raid_params>.
2774 *
2775 * Userspace is free to initialize the metadata devices, hence the superblocks to
2776 * enforce recreation based on the passed in table parameters.
2777 *
2778 */
2779static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2780{
2781 int r;
2782 bool resize;
2783 struct raid_type *rt;
2784 unsigned int num_raid_params, num_raid_devs;
2785 sector_t calculated_dev_sectors;
2786 struct raid_set *rs = NULL;
2787 const char *arg;
2788 struct rs_layout rs_layout;
2789 struct dm_arg_set as = { argc, argv }, as_nrd;
2790 struct dm_arg _args[] = {
2791 { 0, as.argc, "Cannot understand number of raid parameters" },
2792 { 1, 254, "Cannot understand number of raid devices parameters" }
2793 };
2794
2795 /* Must have <raid_type> */
2796 arg = dm_shift_arg(&as);
2797 if (!arg) {
2798 ti->error = "No arguments";
2799 return -EINVAL;
2800 }
2801
2802 rt = get_raid_type(arg);
2803 if (!rt) {
2804 ti->error = "Unrecognised raid_type";
2805 return -EINVAL;
2806 }
2807
2808 /* Must have <#raid_params> */
2809 if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error))
2810 return -EINVAL;
2811
2812 /* number of raid device tupples <meta_dev data_dev> */
2813 as_nrd = as;
2814 dm_consume_args(&as_nrd, num_raid_params);
2815 _args[1].max = (as_nrd.argc - 1) / 2;
2816 if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error))
2817 return -EINVAL;
2818
2819 if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) {
2820 ti->error = "Invalid number of supplied raid devices";
2821 return -EINVAL;
2822 }
2823
2824 rs = raid_set_alloc(ti, rt, num_raid_devs);
2825 if (IS_ERR(rs))
2826 return PTR_ERR(rs);
2827
2828 r = parse_raid_params(rs, &as, num_raid_params);
2829 if (r)
2830 goto bad;
2831
2832 r = parse_dev_params(rs, &as);
2833 if (r)
2834 goto bad;
2835
2836 rs->md.sync_super = super_sync;
2837
2838 /*
2839 * Calculate ctr requested array and device sizes to allow
2840 * for superblock analysis needing device sizes defined.
2841 *
2842 * Any existing superblock will overwrite the array and device sizes
2843 */
2844 r = rs_set_dev_and_array_sectors(rs, false);
2845 if (r)
2846 goto bad;
2847
2848 calculated_dev_sectors = rs->dev[0].rdev.sectors;
2849
2850 /*
2851 * Backup any new raid set level, layout, ...
2852 * requested to be able to compare to superblock
2853 * members for conversion decisions.
2854 */
2855 rs_config_backup(rs, &rs_layout);
2856
2857 r = analyse_superblocks(ti, rs);
2858 if (r)
2859 goto bad;
2860
2861 resize = calculated_dev_sectors != rs->dev[0].rdev.sectors;
2862
2863 INIT_WORK(&rs->md.event_work, do_table_event);
2864 ti->private = rs;
2865 ti->num_flush_bios = 1;
2866
2867 /* Restore any requested new layout for conversion decision */
2868 rs_config_restore(rs, &rs_layout);
2869
2870 /*
2871 * Now that we have any superblock metadata available,
2872 * check for new, recovering, reshaping, to be taken over,
2873 * to be reshaped or an existing, unchanged raid set to
2874 * run in sequence.
2875 */
2876 if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) {
2877 /* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */
2878 if (rs_is_raid6(rs) &&
2879 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
2880 ti->error = "'nosync' not allowed for new raid6 set";
2881 r = -EINVAL;
2882 goto bad;
2883 }
2884 rs_setup_recovery(rs, 0);
2885 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2886 rs_set_new(rs);
2887 } else if (rs_is_recovering(rs)) {
2888 /* A recovering raid set may be resized */
2889 ; /* skip setup rs */
2890 } else if (rs_is_reshaping(rs)) {
2891 /* Have to reject size change request during reshape */
2892 if (resize) {
2893 ti->error = "Can't resize a reshaping raid set";
2894 r = -EPERM;
2895 goto bad;
2896 }
2897 /* skip setup rs */
2898 } else if (rs_takeover_requested(rs)) {
2899 if (rs_is_reshaping(rs)) {
2900 ti->error = "Can't takeover a reshaping raid set";
2901 r = -EPERM;
2902 goto bad;
2903 }
2904
2905 /*
2906 * If a takeover is needed, userspace sets any additional
2907 * devices to rebuild and we can check for a valid request here.
2908 *
2909 * If acceptible, set the level to the new requested
2910 * one, prohibit requesting recovery, allow the raid
2911 * set to run and store superblocks during resume.
2912 */
2913 r = rs_check_takeover(rs);
2914 if (r)
2915 goto bad;
2916
2917 r = rs_setup_takeover(rs);
2918 if (r)
2919 goto bad;
2920
2921 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2922 /* Takeover ain't recovery, so disable recovery */
2923 rs_setup_recovery(rs, MaxSector);
2924 rs_set_new(rs);
2925 } else if (rs_reshape_requested(rs)) {
2926 /*
2927 * We can only prepare for a reshape here, because the
2928 * raid set needs to run to provide the repective reshape
2929 * check functions via its MD personality instance.
2930 *
2931 * So do the reshape check after md_run() succeeded.
2932 */
2933 r = rs_prepare_reshape(rs);
2934 if (r)
2935 return r;
2936
2937 /* Reshaping ain't recovery, so disable recovery */
2938 rs_setup_recovery(rs, MaxSector);
2939 rs_set_cur(rs);
2940 } else {
2941 /* May not set recovery when a device rebuild is requested */
2942 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) {
2943 rs_setup_recovery(rs, MaxSector);
2944 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2945 } else
2946 rs_setup_recovery(rs, test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ?
2947 0 : (resize ? calculated_dev_sectors : MaxSector));
2948 rs_set_cur(rs);
2949 }
2950
2951 /* If constructor requested it, change data and new_data offsets */
2952 r = rs_adjust_data_offsets(rs);
2953 if (r)
2954 goto bad;
2955
2956 /* Start raid set read-only and assumed clean to change in raid_resume() */
2957 rs->md.ro = 1;
2958 rs->md.in_sync = 1;
2959 set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
2960
2961 /* Has to be held on running the array */
2962 mddev_lock_nointr(&rs->md);
2963 r = md_run(&rs->md);
2964 rs->md.in_sync = 0; /* Assume already marked dirty */
2965
2966 if (r) {
2967 ti->error = "Failed to run raid array";
2968 mddev_unlock(&rs->md);
2969 goto bad;
2970 }
2971
2972 rs->callbacks.congested_fn = raid_is_congested;
2973 dm_table_add_target_callbacks(ti->table, &rs->callbacks);
2974
2975 mddev_suspend(&rs->md);
2976
2977 /* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
2978 if (rs_is_raid456(rs)) {
2979 r = rs_set_raid456_stripe_cache(rs);
2980 if (r)
2981 goto bad_stripe_cache;
2982 }
2983
2984 /* Now do an early reshape check */
2985 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
2986 r = rs_check_reshape(rs);
2987 if (r)
2988 goto bad_check_reshape;
2989
2990 /* Restore new, ctr requested layout to perform check */
2991 rs_config_restore(rs, &rs_layout);
2992
2993 if (rs->md.pers->start_reshape) {
2994 r = rs->md.pers->check_reshape(&rs->md);
2995 if (r) {
2996 ti->error = "Reshape check failed";
2997 goto bad_check_reshape;
2998 }
2999 }
3000 }
3001
3002 /* Disable/enable discard support on raid set. */
3003 configure_discard_support(rs);
3004
3005 mddev_unlock(&rs->md);
3006 return 0;
3007
3008bad_stripe_cache:
3009bad_check_reshape:
3010 md_stop(&rs->md);
3011bad:
3012 raid_set_free(rs);
3013
3014 return r;
3015}
3016
3017static void raid_dtr(struct dm_target *ti)
3018{
3019 struct raid_set *rs = ti->private;
3020
3021 list_del_init(&rs->callbacks.list);
3022 md_stop(&rs->md);
3023 raid_set_free(rs);
3024}
3025
3026static int raid_map(struct dm_target *ti, struct bio *bio)
3027{
3028 struct raid_set *rs = ti->private;
3029 struct mddev *mddev = &rs->md;
3030
3031 /*
3032 * If we're reshaping to add disk(s)), ti->len and
3033 * mddev->array_sectors will differ during the process
3034 * (ti->len > mddev->array_sectors), so we have to requeue
3035 * bios with addresses > mddev->array_sectors here or
3036 * there will occur accesses past EOD of the component
3037 * data images thus erroring the raid set.
3038 */
3039 if (unlikely(bio_end_sector(bio) > mddev->array_sectors))
3040 return DM_MAPIO_REQUEUE;
3041
3042 mddev->pers->make_request(mddev, bio);
3043
3044 return DM_MAPIO_SUBMITTED;
3045}
3046
3047/* Return string describing the current sync action of @mddev */
3048static const char *decipher_sync_action(struct mddev *mddev)
3049{
3050 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3051 return "frozen";
3052
3053 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3054 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3055 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3056 return "reshape";
3057
3058 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3059 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3060 return "resync";
3061 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3062 return "check";
3063 return "repair";
3064 }
3065
3066 if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3067 return "recover";
3068 }
3069
3070 return "idle";
3071}
3072
3073/*
3074 * Return status string @rdev
3075 *
3076 * Status characters:
3077 *
3078 * 'D' = Dead/Failed device
3079 * 'a' = Alive but not in-sync
3080 * 'A' = Alive and in-sync
3081 */
3082static const char *__raid_dev_status(struct md_rdev *rdev, bool array_in_sync)
3083{
3084 if (test_bit(Faulty, &rdev->flags))
3085 return "D";
3086 else if (!array_in_sync || !test_bit(In_sync, &rdev->flags))
3087 return "a";
3088 else
3089 return "A";
3090}
3091
3092/* Helper to return resync/reshape progress for @rs and @array_in_sync */
3093static sector_t rs_get_progress(struct raid_set *rs,
3094 sector_t resync_max_sectors, bool *array_in_sync)
3095{
3096 sector_t r, recovery_cp, curr_resync_completed;
3097 struct mddev *mddev = &rs->md;
3098
3099 curr_resync_completed = mddev->curr_resync_completed ?: mddev->recovery_cp;
3100 recovery_cp = mddev->recovery_cp;
3101 *array_in_sync = false;
3102
3103 if (rs_is_raid0(rs)) {
3104 r = resync_max_sectors;
3105 *array_in_sync = true;
3106
3107 } else {
3108 r = mddev->reshape_position;
3109
3110 /* Reshape is relative to the array size */
3111 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
3112 r != MaxSector) {
3113 if (r == MaxSector) {
3114 *array_in_sync = true;
3115 r = resync_max_sectors;
3116 } else {
3117 /* Got to reverse on backward reshape */
3118 if (mddev->reshape_backwards)
3119 r = mddev->array_sectors - r;
3120
3121 /* Devide by # of data stripes */
3122 sector_div(r, mddev_data_stripes(rs));
3123 }
3124
3125 /* Sync is relative to the component device size */
3126 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3127 r = curr_resync_completed;
3128 else
3129 r = recovery_cp;
3130
3131 if (r == MaxSector) {
3132 /*
3133 * Sync complete.
3134 */
3135 *array_in_sync = true;
3136 r = resync_max_sectors;
3137 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
3138 /*
3139 * If "check" or "repair" is occurring, the raid set has
3140 * undergone an initial sync and the health characters
3141 * should not be 'a' anymore.
3142 */
3143 *array_in_sync = true;
3144 } else {
3145 struct md_rdev *rdev;
3146
3147 /*
3148 * The raid set may be doing an initial sync, or it may
3149 * be rebuilding individual components. If all the
3150 * devices are In_sync, then it is the raid set that is
3151 * being initialized.
3152 */
3153 rdev_for_each(rdev, mddev)
3154 if (!test_bit(In_sync, &rdev->flags))
3155 *array_in_sync = true;
3156#if 0
3157 r = 0; /* HM FIXME: TESTME: https://bugzilla.redhat.com/show_bug.cgi?id=1210637 ? */
3158#endif
3159 }
3160 }
3161
3162 return r;
3163}
3164
3165/* Helper to return @dev name or "-" if !@dev */
3166static const char *__get_dev_name(struct dm_dev *dev)
3167{
3168 return dev ? dev->name : "-";
3169}
3170
3171static void raid_status(struct dm_target *ti, status_type_t type,
3172 unsigned int status_flags, char *result, unsigned int maxlen)
3173{
3174 struct raid_set *rs = ti->private;
3175 struct mddev *mddev = &rs->md;
3176 struct r5conf *conf = mddev->private;
3177 int i, max_nr_stripes = conf ? conf->max_nr_stripes : 0;
3178 bool array_in_sync;
3179 unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */
3180 unsigned int sz = 0;
3181 unsigned int rebuild_disks;
3182 unsigned int write_mostly_params = 0;
3183 sector_t progress, resync_max_sectors, resync_mismatches;
3184 const char *sync_action;
3185 struct raid_type *rt;
3186 struct md_rdev *rdev;
3187
3188 switch (type) {
3189 case STATUSTYPE_INFO:
3190 /* *Should* always succeed */
3191 rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
3192 if (!rt)
3193 return;
3194
3195 DMEMIT("%s %d ", rt->name, mddev->raid_disks);
3196
3197 /* Access most recent mddev properties for status output */
3198 smp_rmb();
3199 /* Get sensible max sectors even if raid set not yet started */
3200 resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ?
3201 mddev->resync_max_sectors : mddev->dev_sectors;
3202 progress = rs_get_progress(rs, resync_max_sectors, &array_in_sync);
3203 resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ?
3204 atomic64_read(&mddev->resync_mismatches) : 0;
3205 sync_action = decipher_sync_action(&rs->md);
3206
3207 /* HM FIXME: do we want another state char for raid0? It shows 'D' or 'A' now */
3208 rdev_for_each(rdev, mddev)
3209 DMEMIT(__raid_dev_status(rdev, array_in_sync));
3210
3211 /*
3212 * In-sync/Reshape ratio:
3213 * The in-sync ratio shows the progress of:
3214 * - Initializing the raid set
3215 * - Rebuilding a subset of devices of the raid set
3216 * The user can distinguish between the two by referring
3217 * to the status characters.
3218 *
3219 * The reshape ratio shows the progress of
3220 * changing the raid layout or the number of
3221 * disks of a raid set
3222 */
3223 DMEMIT(" %llu/%llu", (unsigned long long) progress,
3224 (unsigned long long) resync_max_sectors);
3225
3226 /*
3227 * v1.5.0+:
3228 *
3229 * Sync action:
3230 * See Documentation/device-mapper/dm-raid.txt for
3231 * information on each of these states.
3232 */
3233 DMEMIT(" %s", sync_action);
3234
3235 /*
3236 * v1.5.0+:
3237 *
3238 * resync_mismatches/mismatch_cnt
3239 * This field shows the number of discrepancies found when
3240 * performing a "check" of the raid set.
3241 */
3242 DMEMIT(" %llu", (unsigned long long) resync_mismatches);
3243
3244 /*
3245 * v1.9.0+:
3246 *
3247 * data_offset (needed for out of space reshaping)
3248 * This field shows the data offset into the data
3249 * image LV where the first stripes data starts.
3250 *
3251 * We keep data_offset equal on all raid disks of the set,
3252 * so retrieving it from the first raid disk is sufficient.
3253 */
3254 DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset);
3255 break;
3256
3257 case STATUSTYPE_TABLE:
3258 /* Report the table line string you would use to construct this raid set */
3259
3260 /* Calculate raid parameter count */
3261 for (i = 0; i < rs->raid_disks; i++)
3262 if (test_bit(WriteMostly, &rs->dev[i].rdev.flags))
3263 write_mostly_params += 2;
3264 rebuild_disks = memweight(rs->rebuild_disks, DISKS_ARRAY_ELEMS * sizeof(*rs->rebuild_disks));
3265 raid_param_cnt += rebuild_disks * 2 +
3266 write_mostly_params +
3267 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) +
3268 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2;
3269 /* Emit table line */
3270 DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors);
3271 if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags))
3272 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT),
3273 raid10_md_layout_to_format(mddev->layout));
3274 if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags))
3275 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES),
3276 raid10_md_layout_to_copies(mddev->layout));
3277 if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
3278 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC));
3279 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
3280 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC));
3281 if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags))
3282 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE),
3283 (unsigned long long) to_sector(mddev->bitmap_info.chunksize));
3284 if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags))
3285 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET),
3286 (unsigned long long) rs->data_offset);
3287 if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags))
3288 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP),
3289 mddev->bitmap_info.daemon_sleep);
3290 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags))
3291 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS),
3292 max(rs->delta_disks, mddev->delta_disks));
3293 if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags))
3294 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE),
3295 max_nr_stripes);
3296 if (rebuild_disks)
3297 for (i = 0; i < rs->raid_disks; i++)
3298 if (test_bit(rs->dev[i].rdev.raid_disk, (void *) rs->rebuild_disks))
3299 DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD),
3300 rs->dev[i].rdev.raid_disk);
3301 if (write_mostly_params)
3302 for (i = 0; i < rs->raid_disks; i++)
3303 if (test_bit(WriteMostly, &rs->dev[i].rdev.flags))
3304 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY),
3305 rs->dev[i].rdev.raid_disk);
3306 if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags))
3307 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND),
3308 mddev->bitmap_info.max_write_behind);
3309 if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags))
3310 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE),
3311 mddev->sync_speed_max);
3312 if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags))
3313 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE),
3314 mddev->sync_speed_min);
3315 DMEMIT(" %d", rs->raid_disks);
3316 for (i = 0; i < rs->raid_disks; i++)
3317 DMEMIT(" %s %s", __get_dev_name(rs->dev[i].meta_dev),
3318 __get_dev_name(rs->dev[i].data_dev));
3319 }
3320}
3321
3322static int raid_message(struct dm_target *ti, unsigned int argc, char **argv)
3323{
3324 struct raid_set *rs = ti->private;
3325 struct mddev *mddev = &rs->md;
3326
3327 if (!mddev->pers || !mddev->pers->sync_request)
3328 return -EINVAL;
3329
3330 if (!strcasecmp(argv[0], "frozen"))
3331 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3332 else
3333 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3334
3335 if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) {
3336 if (mddev->sync_thread) {
3337 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3338 md_reap_sync_thread(mddev);
3339 }
3340 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3341 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3342 return -EBUSY;
3343 else if (!strcasecmp(argv[0], "resync"))
3344 ; /* MD_RECOVERY_NEEDED set below */
3345 else if (!strcasecmp(argv[0], "recover"))
3346 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3347 else {
3348 if (!strcasecmp(argv[0], "check"))
3349 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3350 else if (!!strcasecmp(argv[0], "repair"))
3351 return -EINVAL;
3352 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3353 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3354 }
3355 if (mddev->ro == 2) {
3356 /* A write to sync_action is enough to justify
3357 * canceling read-auto mode
3358 */
3359 mddev->ro = 0;
3360 if (!mddev->suspended && mddev->sync_thread)
3361 md_wakeup_thread(mddev->sync_thread);
3362 }
3363 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3364 if (!mddev->suspended && mddev->thread)
3365 md_wakeup_thread(mddev->thread);
3366
3367 return 0;
3368}
3369
3370static int raid_iterate_devices(struct dm_target *ti,
3371 iterate_devices_callout_fn fn, void *data)
3372{
3373 struct raid_set *rs = ti->private;
3374 unsigned int i;
3375 int r = 0;
3376
3377 for (i = 0; !r && i < rs->md.raid_disks; i++)
3378 if (rs->dev[i].data_dev)
3379 r = fn(ti,
3380 rs->dev[i].data_dev,
3381 0, /* No offset on data devs */
3382 rs->md.dev_sectors,
3383 data);
3384
3385 return r;
3386}
3387
3388static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
3389{
3390 struct raid_set *rs = ti->private;
3391 unsigned int chunk_size = to_bytes(rs->md.chunk_sectors);
3392
3393 blk_limits_io_min(limits, chunk_size);
3394 blk_limits_io_opt(limits, chunk_size * mddev_data_stripes(rs));
3395}
3396
3397static void raid_presuspend(struct dm_target *ti)
3398{
3399 struct raid_set *rs = ti->private;
3400
3401 md_stop_writes(&rs->md);
3402}
3403
3404static void raid_postsuspend(struct dm_target *ti)
3405{
3406 struct raid_set *rs = ti->private;
3407
3408 if (!rs->md.suspended)
3409 mddev_suspend(&rs->md);
3410
3411 rs->md.ro = 1;
3412}
3413
3414static void attempt_restore_of_faulty_devices(struct raid_set *rs)
3415{
3416 int i;
3417 uint64_t cleared_failed_devices[DISKS_ARRAY_ELEMS];
3418 unsigned long flags;
3419 bool cleared = false;
3420 struct dm_raid_superblock *sb;
3421 struct mddev *mddev = &rs->md;
3422 struct md_rdev *r;
3423
3424 /* RAID personalities have to provide hot add/remove methods or we need to bail out. */
3425 if (!mddev->pers || !mddev->pers->hot_add_disk || !mddev->pers->hot_remove_disk)
3426 return;
3427
3428 memset(cleared_failed_devices, 0, sizeof(cleared_failed_devices));
3429
3430 for (i = 0; i < rs->md.raid_disks; i++) {
3431 r = &rs->dev[i].rdev;
3432 if (test_bit(Faulty, &r->flags) && r->sb_page &&
3433 sync_page_io(r, 0, r->sb_size, r->sb_page,
3434 REQ_OP_READ, 0, true)) {
3435 DMINFO("Faulty %s device #%d has readable super block."
3436 " Attempting to revive it.",
3437 rs->raid_type->name, i);
3438
3439 /*
3440 * Faulty bit may be set, but sometimes the array can
3441 * be suspended before the personalities can respond
3442 * by removing the device from the array (i.e. calling
3443 * 'hot_remove_disk'). If they haven't yet removed
3444 * the failed device, its 'raid_disk' number will be
3445 * '>= 0' - meaning we must call this function
3446 * ourselves.
3447 */
3448 if ((r->raid_disk >= 0) &&
3449 (mddev->pers->hot_remove_disk(mddev, r) != 0))
3450 /* Failed to revive this device, try next */
3451 continue;
3452
3453 r->raid_disk = i;
3454 r->saved_raid_disk = i;
3455 flags = r->flags;
3456 clear_bit(Faulty, &r->flags);
3457 clear_bit(WriteErrorSeen, &r->flags);
3458 clear_bit(In_sync, &r->flags);
3459 if (mddev->pers->hot_add_disk(mddev, r)) {
3460 r->raid_disk = -1;
3461 r->saved_raid_disk = -1;
3462 r->flags = flags;
3463 } else {
3464 r->recovery_offset = 0;
3465 set_bit(i, (void *) cleared_failed_devices);
3466 cleared = true;
3467 }
3468 }
3469 }
3470
3471 /* If any failed devices could be cleared, update all sbs failed_devices bits */
3472 if (cleared) {
3473 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
3474
3475 rdev_for_each(r, &rs->md) {
3476 sb = page_address(r->sb_page);
3477 sb_retrieve_failed_devices(sb, failed_devices);
3478
3479 for (i = 0; i < DISKS_ARRAY_ELEMS; i++)
3480 failed_devices[i] &= ~cleared_failed_devices[i];
3481
3482 sb_update_failed_devices(sb, failed_devices);
3483 }
3484 }
3485}
3486
3487static int __load_dirty_region_bitmap(struct raid_set *rs)
3488{
3489 int r = 0;
3490
3491 /* Try loading the bitmap unless "raid0", which does not have one */
3492 if (!rs_is_raid0(rs) &&
3493 !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) {
3494 r = bitmap_load(&rs->md);
3495 if (r)
3496 DMERR("Failed to load bitmap");
3497 }
3498
3499 return r;
3500}
3501
3502/* Enforce updating all superblocks */
3503static void rs_update_sbs(struct raid_set *rs)
3504{
3505 struct mddev *mddev = &rs->md;
3506 int ro = mddev->ro;
3507
3508 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3509 mddev->ro = 0;
3510 md_update_sb(mddev, 1);
3511 mddev->ro = ro;
3512}
3513
3514/*
3515 * Reshape changes raid algorithm of @rs to new one within personality
3516 * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes
3517 * disks from a raid set thus growing/shrinking it or resizes the set
3518 *
3519 * Call mddev_lock_nointr() before!
3520 */
3521static int rs_start_reshape(struct raid_set *rs)
3522{
3523 int r;
3524 struct mddev *mddev = &rs->md;
3525 struct md_personality *pers = mddev->pers;
3526
3527 r = rs_setup_reshape(rs);
3528 if (r)
3529 return r;
3530
3531 /* Need to be resumed to be able to start reshape, recovery is frozen until raid_resume() though */
3532 if (mddev->suspended)
3533 mddev_resume(mddev);
3534
3535 /*
3536 * Check any reshape constraints enforced by the personalility
3537 *
3538 * May as well already kick the reshape off so that * pers->start_reshape() becomes optional.
3539 */
3540 r = pers->check_reshape(mddev);
3541 if (r) {
3542 rs->ti->error = "pers->check_reshape() failed";
3543 return r;
3544 }
3545
3546 /*
3547 * Personality may not provide start reshape method in which
3548 * case check_reshape above has already covered everything
3549 */
3550 if (pers->start_reshape) {
3551 r = pers->start_reshape(mddev);
3552 if (r) {
3553 rs->ti->error = "pers->start_reshape() failed";
3554 return r;
3555 }
3556 }
3557
3558 /* Suspend because a resume will happen in raid_resume() */
3559 if (!mddev->suspended)
3560 mddev_suspend(mddev);
3561
3562 /*
3563 * Now reshape got set up, update superblocks to
3564 * reflect the fact so that a table reload will
3565 * access proper superblock content in the ctr.
3566 */
3567 rs_update_sbs(rs);
3568
3569 return 0;
3570}
3571
3572static int raid_preresume(struct dm_target *ti)
3573{
3574 int r;
3575 struct raid_set *rs = ti->private;
3576 struct mddev *mddev = &rs->md;
3577
3578 /* This is a resume after a suspend of the set -> it's already started */
3579 if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags))
3580 return 0;
3581
3582 /*
3583 * The superblocks need to be updated on disk if the
3584 * array is new or new devices got added (thus zeroed
3585 * out by userspace) or __load_dirty_region_bitmap
3586 * will overwrite them in core with old data or fail.
3587 */
3588 if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags))
3589 rs_update_sbs(rs);
3590
3591 /* Load the bitmap from disk unless raid0 */
3592 r = __load_dirty_region_bitmap(rs);
3593 if (r)
3594 return r;
3595
3596 /* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) */
3597 if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) && mddev->bitmap &&
3598 mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)) {
3599 r = bitmap_resize(mddev->bitmap, mddev->dev_sectors,
3600 to_bytes(rs->requested_bitmap_chunk_sectors), 0);
3601 if (r)
3602 DMERR("Failed to resize bitmap");
3603 }
3604
3605 /* Check for any resize/reshape on @rs and adjust/initiate */
3606 /* Be prepared for mddev_resume() in raid_resume() */
3607 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3608 if (mddev->recovery_cp && mddev->recovery_cp < MaxSector) {
3609 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3610 mddev->resync_min = mddev->recovery_cp;
3611 }
3612
3613 rs_set_capacity(rs);
3614
3615 /* Check for any reshape request unless new raid set */
3616 if (test_and_clear_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
3617 /* Initiate a reshape. */
3618 mddev_lock_nointr(mddev);
3619 r = rs_start_reshape(rs);
3620 mddev_unlock(mddev);
3621 if (r)
3622 DMWARN("Failed to check/start reshape, continuing without change");
3623 r = 0;
3624 }
3625
3626 return r;
3627}
3628
3629#define RESUME_STAY_FROZEN_FLAGS (CTR_FLAG_DELTA_DISKS | CTR_FLAG_DATA_OFFSET)
3630
3631static void raid_resume(struct dm_target *ti)
3632{
3633 struct raid_set *rs = ti->private;
3634 struct mddev *mddev = &rs->md;
3635
3636 if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) {
3637 /*
3638 * A secondary resume while the device is active.
3639 * Take this opportunity to check whether any failed
3640 * devices are reachable again.
3641 */
3642 attempt_restore_of_faulty_devices(rs);
3643 }
3644
3645 mddev->ro = 0;
3646 mddev->in_sync = 0;
3647
3648 /*
3649 * Keep the RAID set frozen if reshape/rebuild flags are set.
3650 * The RAID set is unfrozen once the next table load/resume,
3651 * which clears the reshape/rebuild flags, occurs.
3652 * This ensures that the constructor for the inactive table
3653 * retrieves an up-to-date reshape_position.
3654 */
3655 if (!(rs->ctr_flags & RESUME_STAY_FROZEN_FLAGS))
3656 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3657
3658 if (mddev->suspended)
3659 mddev_resume(mddev);
3660}
3661
3662static struct target_type raid_target = {
3663 .name = "raid",
3664 .version = {1, 9, 1},
3665 .module = THIS_MODULE,
3666 .ctr = raid_ctr,
3667 .dtr = raid_dtr,
3668 .map = raid_map,
3669 .status = raid_status,
3670 .message = raid_message,
3671 .iterate_devices = raid_iterate_devices,
3672 .io_hints = raid_io_hints,
3673 .presuspend = raid_presuspend,
3674 .postsuspend = raid_postsuspend,
3675 .preresume = raid_preresume,
3676 .resume = raid_resume,
3677};
3678
3679static int __init dm_raid_init(void)
3680{
3681 DMINFO("Loading target version %u.%u.%u",
3682 raid_target.version[0],
3683 raid_target.version[1],
3684 raid_target.version[2]);
3685 return dm_register_target(&raid_target);
3686}
3687
3688static void __exit dm_raid_exit(void)
3689{
3690 dm_unregister_target(&raid_target);
3691}
3692
3693module_init(dm_raid_init);
3694module_exit(dm_raid_exit);
3695
3696module_param(devices_handle_discard_safely, bool, 0644);
3697MODULE_PARM_DESC(devices_handle_discard_safely,
3698 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
3699
3700MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target");
3701MODULE_ALIAS("dm-raid0");
3702MODULE_ALIAS("dm-raid1");
3703MODULE_ALIAS("dm-raid10");
3704MODULE_ALIAS("dm-raid4");
3705MODULE_ALIAS("dm-raid5");
3706MODULE_ALIAS("dm-raid6");
3707MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
3708MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>");
3709MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2010-2011 Neil Brown
4 * Copyright (C) 2010-2018 Red Hat, Inc. All rights reserved.
5 *
6 * This file is released under the GPL.
7 */
8
9#include <linux/slab.h>
10#include <linux/module.h>
11
12#include "md.h"
13#include "raid1.h"
14#include "raid5.h"
15#include "raid10.h"
16#include "md-bitmap.h"
17
18#include <linux/device-mapper.h>
19
20#define DM_MSG_PREFIX "raid"
21#define MAX_RAID_DEVICES 253 /* md-raid kernel limit */
22
23/*
24 * Minimum sectors of free reshape space per raid device
25 */
26#define MIN_FREE_RESHAPE_SPACE to_sector(4*4096)
27
28/*
29 * Minimum journal space 4 MiB in sectors.
30 */
31#define MIN_RAID456_JOURNAL_SPACE (4*2048)
32
33static bool devices_handle_discard_safely;
34
35/*
36 * The following flags are used by dm-raid to set up the array state.
37 * They must be cleared before md_run is called.
38 */
39#define FirstUse 10 /* rdev flag */
40
41struct raid_dev {
42 /*
43 * Two DM devices, one to hold metadata and one to hold the
44 * actual data/parity. The reason for this is to not confuse
45 * ti->len and give more flexibility in altering size and
46 * characteristics.
47 *
48 * While it is possible for this device to be associated
49 * with a different physical device than the data_dev, it
50 * is intended for it to be the same.
51 * |--------- Physical Device ---------|
52 * |- meta_dev -|------ data_dev ------|
53 */
54 struct dm_dev *meta_dev;
55 struct dm_dev *data_dev;
56 struct md_rdev rdev;
57};
58
59/*
60 * Bits for establishing rs->ctr_flags
61 *
62 * 1 = no flag value
63 * 2 = flag with value
64 */
65#define __CTR_FLAG_SYNC 0 /* 1 */ /* Not with raid0! */
66#define __CTR_FLAG_NOSYNC 1 /* 1 */ /* Not with raid0! */
67#define __CTR_FLAG_REBUILD 2 /* 2 */ /* Not with raid0! */
68#define __CTR_FLAG_DAEMON_SLEEP 3 /* 2 */ /* Not with raid0! */
69#define __CTR_FLAG_MIN_RECOVERY_RATE 4 /* 2 */ /* Not with raid0! */
70#define __CTR_FLAG_MAX_RECOVERY_RATE 5 /* 2 */ /* Not with raid0! */
71#define __CTR_FLAG_MAX_WRITE_BEHIND 6 /* 2 */ /* Only with raid1! */
72#define __CTR_FLAG_WRITE_MOSTLY 7 /* 2 */ /* Only with raid1! */
73#define __CTR_FLAG_STRIPE_CACHE 8 /* 2 */ /* Only with raid4/5/6! */
74#define __CTR_FLAG_REGION_SIZE 9 /* 2 */ /* Not with raid0! */
75#define __CTR_FLAG_RAID10_COPIES 10 /* 2 */ /* Only with raid10 */
76#define __CTR_FLAG_RAID10_FORMAT 11 /* 2 */ /* Only with raid10 */
77/* New for v1.9.0 */
78#define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid1/4/5/6/10! */
79#define __CTR_FLAG_DATA_OFFSET 13 /* 2 */ /* Only with reshapable raid4/5/6/10! */
80#define __CTR_FLAG_RAID10_USE_NEAR_SETS 14 /* 2 */ /* Only with raid10! */
81
82/* New for v1.10.0 */
83#define __CTR_FLAG_JOURNAL_DEV 15 /* 2 */ /* Only with raid4/5/6 (journal device)! */
84
85/* New for v1.11.1 */
86#define __CTR_FLAG_JOURNAL_MODE 16 /* 2 */ /* Only with raid4/5/6 (journal mode)! */
87
88/*
89 * Flags for rs->ctr_flags field.
90 */
91#define CTR_FLAG_SYNC (1 << __CTR_FLAG_SYNC)
92#define CTR_FLAG_NOSYNC (1 << __CTR_FLAG_NOSYNC)
93#define CTR_FLAG_REBUILD (1 << __CTR_FLAG_REBUILD)
94#define CTR_FLAG_DAEMON_SLEEP (1 << __CTR_FLAG_DAEMON_SLEEP)
95#define CTR_FLAG_MIN_RECOVERY_RATE (1 << __CTR_FLAG_MIN_RECOVERY_RATE)
96#define CTR_FLAG_MAX_RECOVERY_RATE (1 << __CTR_FLAG_MAX_RECOVERY_RATE)
97#define CTR_FLAG_MAX_WRITE_BEHIND (1 << __CTR_FLAG_MAX_WRITE_BEHIND)
98#define CTR_FLAG_WRITE_MOSTLY (1 << __CTR_FLAG_WRITE_MOSTLY)
99#define CTR_FLAG_STRIPE_CACHE (1 << __CTR_FLAG_STRIPE_CACHE)
100#define CTR_FLAG_REGION_SIZE (1 << __CTR_FLAG_REGION_SIZE)
101#define CTR_FLAG_RAID10_COPIES (1 << __CTR_FLAG_RAID10_COPIES)
102#define CTR_FLAG_RAID10_FORMAT (1 << __CTR_FLAG_RAID10_FORMAT)
103#define CTR_FLAG_DELTA_DISKS (1 << __CTR_FLAG_DELTA_DISKS)
104#define CTR_FLAG_DATA_OFFSET (1 << __CTR_FLAG_DATA_OFFSET)
105#define CTR_FLAG_RAID10_USE_NEAR_SETS (1 << __CTR_FLAG_RAID10_USE_NEAR_SETS)
106#define CTR_FLAG_JOURNAL_DEV (1 << __CTR_FLAG_JOURNAL_DEV)
107#define CTR_FLAG_JOURNAL_MODE (1 << __CTR_FLAG_JOURNAL_MODE)
108
109/*
110 * Definitions of various constructor flags to
111 * be used in checks of valid / invalid flags
112 * per raid level.
113 */
114/* Define all any sync flags */
115#define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)
116
117/* Define flags for options without argument (e.g. 'nosync') */
118#define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \
119 CTR_FLAG_RAID10_USE_NEAR_SETS)
120
121/* Define flags for options with one argument (e.g. 'delta_disks +2') */
122#define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \
123 CTR_FLAG_WRITE_MOSTLY | \
124 CTR_FLAG_DAEMON_SLEEP | \
125 CTR_FLAG_MIN_RECOVERY_RATE | \
126 CTR_FLAG_MAX_RECOVERY_RATE | \
127 CTR_FLAG_MAX_WRITE_BEHIND | \
128 CTR_FLAG_STRIPE_CACHE | \
129 CTR_FLAG_REGION_SIZE | \
130 CTR_FLAG_RAID10_COPIES | \
131 CTR_FLAG_RAID10_FORMAT | \
132 CTR_FLAG_DELTA_DISKS | \
133 CTR_FLAG_DATA_OFFSET | \
134 CTR_FLAG_JOURNAL_DEV | \
135 CTR_FLAG_JOURNAL_MODE)
136
137/* Valid options definitions per raid level... */
138
139/* "raid0" does only accept data offset */
140#define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET)
141
142/* "raid1" does not accept stripe cache, data offset, delta_disks or any raid10 options */
143#define RAID1_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
144 CTR_FLAG_REBUILD | \
145 CTR_FLAG_WRITE_MOSTLY | \
146 CTR_FLAG_DAEMON_SLEEP | \
147 CTR_FLAG_MIN_RECOVERY_RATE | \
148 CTR_FLAG_MAX_RECOVERY_RATE | \
149 CTR_FLAG_MAX_WRITE_BEHIND | \
150 CTR_FLAG_REGION_SIZE | \
151 CTR_FLAG_DELTA_DISKS | \
152 CTR_FLAG_DATA_OFFSET)
153
154/* "raid10" does not accept any raid1 or stripe cache options */
155#define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
156 CTR_FLAG_REBUILD | \
157 CTR_FLAG_DAEMON_SLEEP | \
158 CTR_FLAG_MIN_RECOVERY_RATE | \
159 CTR_FLAG_MAX_RECOVERY_RATE | \
160 CTR_FLAG_REGION_SIZE | \
161 CTR_FLAG_RAID10_COPIES | \
162 CTR_FLAG_RAID10_FORMAT | \
163 CTR_FLAG_DELTA_DISKS | \
164 CTR_FLAG_DATA_OFFSET | \
165 CTR_FLAG_RAID10_USE_NEAR_SETS)
166
167/*
168 * "raid4/5/6" do not accept any raid1 or raid10 specific options
169 *
170 * "raid6" does not accept "nosync", because it is not guaranteed
171 * that both parity and q-syndrome are being written properly with
172 * any writes
173 */
174#define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
175 CTR_FLAG_REBUILD | \
176 CTR_FLAG_DAEMON_SLEEP | \
177 CTR_FLAG_MIN_RECOVERY_RATE | \
178 CTR_FLAG_MAX_RECOVERY_RATE | \
179 CTR_FLAG_STRIPE_CACHE | \
180 CTR_FLAG_REGION_SIZE | \
181 CTR_FLAG_DELTA_DISKS | \
182 CTR_FLAG_DATA_OFFSET | \
183 CTR_FLAG_JOURNAL_DEV | \
184 CTR_FLAG_JOURNAL_MODE)
185
186#define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \
187 CTR_FLAG_REBUILD | \
188 CTR_FLAG_DAEMON_SLEEP | \
189 CTR_FLAG_MIN_RECOVERY_RATE | \
190 CTR_FLAG_MAX_RECOVERY_RATE | \
191 CTR_FLAG_STRIPE_CACHE | \
192 CTR_FLAG_REGION_SIZE | \
193 CTR_FLAG_DELTA_DISKS | \
194 CTR_FLAG_DATA_OFFSET | \
195 CTR_FLAG_JOURNAL_DEV | \
196 CTR_FLAG_JOURNAL_MODE)
197/* ...valid options definitions per raid level */
198
199/*
200 * Flags for rs->runtime_flags field
201 * (RT_FLAG prefix meaning "runtime flag")
202 *
203 * These are all internal and used to define runtime state,
204 * e.g. to prevent another resume from preresume processing
205 * the raid set all over again.
206 */
207#define RT_FLAG_RS_PRERESUMED 0
208#define RT_FLAG_RS_RESUMED 1
209#define RT_FLAG_RS_BITMAP_LOADED 2
210#define RT_FLAG_UPDATE_SBS 3
211#define RT_FLAG_RESHAPE_RS 4
212#define RT_FLAG_RS_SUSPENDED 5
213#define RT_FLAG_RS_IN_SYNC 6
214#define RT_FLAG_RS_RESYNCING 7
215#define RT_FLAG_RS_GROW 8
216#define RT_FLAG_RS_FROZEN 9
217
218/* Array elements of 64 bit needed for rebuild/failed disk bits */
219#define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8)
220
221/*
222 * raid set level, layout and chunk sectors backup/restore
223 */
224struct rs_layout {
225 int new_level;
226 int new_layout;
227 int new_chunk_sectors;
228};
229
230struct raid_set {
231 struct dm_target *ti;
232
233 uint32_t stripe_cache_entries;
234 unsigned long ctr_flags;
235 unsigned long runtime_flags;
236
237 uint64_t rebuild_disks[DISKS_ARRAY_ELEMS];
238
239 int raid_disks;
240 int delta_disks;
241 int data_offset;
242 int raid10_copies;
243 int requested_bitmap_chunk_sectors;
244
245 struct mddev md;
246 struct raid_type *raid_type;
247
248 sector_t array_sectors;
249 sector_t dev_sectors;
250
251 /* Optional raid4/5/6 journal device */
252 struct journal_dev {
253 struct dm_dev *dev;
254 struct md_rdev rdev;
255 int mode;
256 } journal_dev;
257
258 struct raid_dev dev[] __counted_by(raid_disks);
259};
260
261static void rs_config_backup(struct raid_set *rs, struct rs_layout *l)
262{
263 struct mddev *mddev = &rs->md;
264
265 l->new_level = mddev->new_level;
266 l->new_layout = mddev->new_layout;
267 l->new_chunk_sectors = mddev->new_chunk_sectors;
268}
269
270static void rs_config_restore(struct raid_set *rs, struct rs_layout *l)
271{
272 struct mddev *mddev = &rs->md;
273
274 mddev->new_level = l->new_level;
275 mddev->new_layout = l->new_layout;
276 mddev->new_chunk_sectors = l->new_chunk_sectors;
277}
278
279/* raid10 algorithms (i.e. formats) */
280#define ALGORITHM_RAID10_DEFAULT 0
281#define ALGORITHM_RAID10_NEAR 1
282#define ALGORITHM_RAID10_OFFSET 2
283#define ALGORITHM_RAID10_FAR 3
284
285/* Supported raid types and properties. */
286static struct raid_type {
287 const char *name; /* RAID algorithm. */
288 const char *descr; /* Descriptor text for logging. */
289 const unsigned int parity_devs; /* # of parity devices. */
290 const unsigned int minimal_devs;/* minimal # of devices in set. */
291 const unsigned int level; /* RAID level. */
292 const unsigned int algorithm; /* RAID algorithm. */
293} raid_types[] = {
294 {"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */},
295 {"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */},
296 {"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR},
297 {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET},
298 {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR},
299 {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT},
300 {"raid4", "raid4 (dedicated first parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, /* raid4 layout = raid5_0 */
301 {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N},
302 {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
303 {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
304 {"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
305 {"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
306 {"raid6_zr", "raid6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART},
307 {"raid6_nr", "raid6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART},
308 {"raid6_nc", "raid6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE},
309 {"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6},
310 {"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6},
311 {"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6},
312 {"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6},
313 {"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6}
314};
315
316/* True, if @v is in inclusive range [@min, @max] */
317static bool __within_range(long v, long min, long max)
318{
319 return v >= min && v <= max;
320}
321
322/* All table line arguments are defined here */
323static struct arg_name_flag {
324 const unsigned long flag;
325 const char *name;
326} __arg_name_flags[] = {
327 { CTR_FLAG_SYNC, "sync"},
328 { CTR_FLAG_NOSYNC, "nosync"},
329 { CTR_FLAG_REBUILD, "rebuild"},
330 { CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"},
331 { CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"},
332 { CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"},
333 { CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"},
334 { CTR_FLAG_WRITE_MOSTLY, "write_mostly"},
335 { CTR_FLAG_STRIPE_CACHE, "stripe_cache"},
336 { CTR_FLAG_REGION_SIZE, "region_size"},
337 { CTR_FLAG_RAID10_COPIES, "raid10_copies"},
338 { CTR_FLAG_RAID10_FORMAT, "raid10_format"},
339 { CTR_FLAG_DATA_OFFSET, "data_offset"},
340 { CTR_FLAG_DELTA_DISKS, "delta_disks"},
341 { CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"},
342 { CTR_FLAG_JOURNAL_DEV, "journal_dev" },
343 { CTR_FLAG_JOURNAL_MODE, "journal_mode" },
344};
345
346/* Return argument name string for given @flag */
347static const char *dm_raid_arg_name_by_flag(const uint32_t flag)
348{
349 if (hweight32(flag) == 1) {
350 struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags);
351
352 while (anf-- > __arg_name_flags)
353 if (flag & anf->flag)
354 return anf->name;
355
356 } else
357 DMERR("%s called with more than one flag!", __func__);
358
359 return NULL;
360}
361
362/* Define correlation of raid456 journal cache modes and dm-raid target line parameters */
363static struct {
364 const int mode;
365 const char *param;
366} _raid456_journal_mode[] = {
367 { R5C_JOURNAL_MODE_WRITE_THROUGH, "writethrough" },
368 { R5C_JOURNAL_MODE_WRITE_BACK, "writeback" }
369};
370
371/* Return MD raid4/5/6 journal mode for dm @journal_mode one */
372static int dm_raid_journal_mode_to_md(const char *mode)
373{
374 int m = ARRAY_SIZE(_raid456_journal_mode);
375
376 while (m--)
377 if (!strcasecmp(mode, _raid456_journal_mode[m].param))
378 return _raid456_journal_mode[m].mode;
379
380 return -EINVAL;
381}
382
383/* Return dm-raid raid4/5/6 journal mode string for @mode */
384static const char *md_journal_mode_to_dm_raid(const int mode)
385{
386 int m = ARRAY_SIZE(_raid456_journal_mode);
387
388 while (m--)
389 if (mode == _raid456_journal_mode[m].mode)
390 return _raid456_journal_mode[m].param;
391
392 return "unknown";
393}
394
395/*
396 * Bool helpers to test for various raid levels of a raid set.
397 * It's level as reported by the superblock rather than
398 * the requested raid_type passed to the constructor.
399 */
400/* Return true, if raid set in @rs is raid0 */
401static bool rs_is_raid0(struct raid_set *rs)
402{
403 return !rs->md.level;
404}
405
406/* Return true, if raid set in @rs is raid1 */
407static bool rs_is_raid1(struct raid_set *rs)
408{
409 return rs->md.level == 1;
410}
411
412/* Return true, if raid set in @rs is raid10 */
413static bool rs_is_raid10(struct raid_set *rs)
414{
415 return rs->md.level == 10;
416}
417
418/* Return true, if raid set in @rs is level 6 */
419static bool rs_is_raid6(struct raid_set *rs)
420{
421 return rs->md.level == 6;
422}
423
424/* Return true, if raid set in @rs is level 4, 5 or 6 */
425static bool rs_is_raid456(struct raid_set *rs)
426{
427 return __within_range(rs->md.level, 4, 6);
428}
429
430/* Return true, if raid set in @rs is reshapable */
431static bool __is_raid10_far(int layout);
432static bool rs_is_reshapable(struct raid_set *rs)
433{
434 return rs_is_raid456(rs) ||
435 (rs_is_raid10(rs) && !__is_raid10_far(rs->md.new_layout));
436}
437
438/* Return true, if raid set in @rs is recovering */
439static bool rs_is_recovering(struct raid_set *rs)
440{
441 return rs->md.recovery_cp < rs->md.dev_sectors;
442}
443
444/* Return true, if raid set in @rs is reshaping */
445static bool rs_is_reshaping(struct raid_set *rs)
446{
447 return rs->md.reshape_position != MaxSector;
448}
449
450/*
451 * bool helpers to test for various raid levels of a raid type @rt
452 */
453
454/* Return true, if raid type in @rt is raid0 */
455static bool rt_is_raid0(struct raid_type *rt)
456{
457 return !rt->level;
458}
459
460/* Return true, if raid type in @rt is raid1 */
461static bool rt_is_raid1(struct raid_type *rt)
462{
463 return rt->level == 1;
464}
465
466/* Return true, if raid type in @rt is raid10 */
467static bool rt_is_raid10(struct raid_type *rt)
468{
469 return rt->level == 10;
470}
471
472/* Return true, if raid type in @rt is raid4/5 */
473static bool rt_is_raid45(struct raid_type *rt)
474{
475 return __within_range(rt->level, 4, 5);
476}
477
478/* Return true, if raid type in @rt is raid6 */
479static bool rt_is_raid6(struct raid_type *rt)
480{
481 return rt->level == 6;
482}
483
484/* Return true, if raid type in @rt is raid4/5/6 */
485static bool rt_is_raid456(struct raid_type *rt)
486{
487 return __within_range(rt->level, 4, 6);
488}
489/* END: raid level bools */
490
491/* Return valid ctr flags for the raid level of @rs */
492static unsigned long __valid_flags(struct raid_set *rs)
493{
494 if (rt_is_raid0(rs->raid_type))
495 return RAID0_VALID_FLAGS;
496 else if (rt_is_raid1(rs->raid_type))
497 return RAID1_VALID_FLAGS;
498 else if (rt_is_raid10(rs->raid_type))
499 return RAID10_VALID_FLAGS;
500 else if (rt_is_raid45(rs->raid_type))
501 return RAID45_VALID_FLAGS;
502 else if (rt_is_raid6(rs->raid_type))
503 return RAID6_VALID_FLAGS;
504
505 return 0;
506}
507
508/*
509 * Check for valid flags set on @rs
510 *
511 * Has to be called after parsing of the ctr flags!
512 */
513static int rs_check_for_valid_flags(struct raid_set *rs)
514{
515 if (rs->ctr_flags & ~__valid_flags(rs)) {
516 rs->ti->error = "Invalid flags combination";
517 return -EINVAL;
518 }
519
520 return 0;
521}
522
523/* MD raid10 bit definitions and helpers */
524#define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */
525#define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */
526#define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */
527#define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */
528
529/* Return md raid10 near copies for @layout */
530static unsigned int __raid10_near_copies(int layout)
531{
532 return layout & 0xFF;
533}
534
535/* Return md raid10 far copies for @layout */
536static unsigned int __raid10_far_copies(int layout)
537{
538 return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);
539}
540
541/* Return true if md raid10 offset for @layout */
542static bool __is_raid10_offset(int layout)
543{
544 return !!(layout & RAID10_OFFSET);
545}
546
547/* Return true if md raid10 near for @layout */
548static bool __is_raid10_near(int layout)
549{
550 return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1;
551}
552
553/* Return true if md raid10 far for @layout */
554static bool __is_raid10_far(int layout)
555{
556 return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1;
557}
558
559/* Return md raid10 layout string for @layout */
560static const char *raid10_md_layout_to_format(int layout)
561{
562 /*
563 * Bit 16 stands for "offset"
564 * (i.e. adjacent stripes hold copies)
565 *
566 * Refer to MD's raid10.c for details
567 */
568 if (__is_raid10_offset(layout))
569 return "offset";
570
571 if (__raid10_near_copies(layout) > 1)
572 return "near";
573
574 if (__raid10_far_copies(layout) > 1)
575 return "far";
576
577 return "unknown";
578}
579
580/* Return md raid10 algorithm for @name */
581static int raid10_name_to_format(const char *name)
582{
583 if (!strcasecmp(name, "near"))
584 return ALGORITHM_RAID10_NEAR;
585 else if (!strcasecmp(name, "offset"))
586 return ALGORITHM_RAID10_OFFSET;
587 else if (!strcasecmp(name, "far"))
588 return ALGORITHM_RAID10_FAR;
589
590 return -EINVAL;
591}
592
593/* Return md raid10 copies for @layout */
594static unsigned int raid10_md_layout_to_copies(int layout)
595{
596 return max(__raid10_near_copies(layout), __raid10_far_copies(layout));
597}
598
599/* Return md raid10 format id for @format string */
600static int raid10_format_to_md_layout(struct raid_set *rs,
601 unsigned int algorithm,
602 unsigned int copies)
603{
604 unsigned int n = 1, f = 1, r = 0;
605
606 /*
607 * MD resilienece flaw:
608 *
609 * enabling use_far_sets for far/offset formats causes copies
610 * to be colocated on the same devs together with their origins!
611 *
612 * -> disable it for now in the definition above
613 */
614 if (algorithm == ALGORITHM_RAID10_DEFAULT ||
615 algorithm == ALGORITHM_RAID10_NEAR)
616 n = copies;
617
618 else if (algorithm == ALGORITHM_RAID10_OFFSET) {
619 f = copies;
620 r = RAID10_OFFSET;
621 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
622 r |= RAID10_USE_FAR_SETS;
623
624 } else if (algorithm == ALGORITHM_RAID10_FAR) {
625 f = copies;
626 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
627 r |= RAID10_USE_FAR_SETS;
628
629 } else
630 return -EINVAL;
631
632 return r | (f << RAID10_FAR_COPIES_SHIFT) | n;
633}
634/* END: MD raid10 bit definitions and helpers */
635
636/* Check for any of the raid10 algorithms */
637static bool __got_raid10(struct raid_type *rtp, const int layout)
638{
639 if (rtp->level == 10) {
640 switch (rtp->algorithm) {
641 case ALGORITHM_RAID10_DEFAULT:
642 case ALGORITHM_RAID10_NEAR:
643 return __is_raid10_near(layout);
644 case ALGORITHM_RAID10_OFFSET:
645 return __is_raid10_offset(layout);
646 case ALGORITHM_RAID10_FAR:
647 return __is_raid10_far(layout);
648 default:
649 break;
650 }
651 }
652
653 return false;
654}
655
656/* Return raid_type for @name */
657static struct raid_type *get_raid_type(const char *name)
658{
659 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
660
661 while (rtp-- > raid_types)
662 if (!strcasecmp(rtp->name, name))
663 return rtp;
664
665 return NULL;
666}
667
668/* Return raid_type for @name based derived from @level and @layout */
669static struct raid_type *get_raid_type_by_ll(const int level, const int layout)
670{
671 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
672
673 while (rtp-- > raid_types) {
674 /* RAID10 special checks based on @layout flags/properties */
675 if (rtp->level == level &&
676 (__got_raid10(rtp, layout) || rtp->algorithm == layout))
677 return rtp;
678 }
679
680 return NULL;
681}
682
683/* Adjust rdev sectors */
684static void rs_set_rdev_sectors(struct raid_set *rs)
685{
686 struct mddev *mddev = &rs->md;
687 struct md_rdev *rdev;
688
689 /*
690 * raid10 sets rdev->sector to the device size, which
691 * is unintended in case of out-of-place reshaping
692 */
693 rdev_for_each(rdev, mddev)
694 if (!test_bit(Journal, &rdev->flags))
695 rdev->sectors = mddev->dev_sectors;
696}
697
698/*
699 * Change bdev capacity of @rs in case of a disk add/remove reshape
700 */
701static void rs_set_capacity(struct raid_set *rs)
702{
703 struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table));
704
705 set_capacity_and_notify(gendisk, rs->md.array_sectors);
706}
707
708/*
709 * Set the mddev properties in @rs to the current
710 * ones retrieved from the freshest superblock
711 */
712static void rs_set_cur(struct raid_set *rs)
713{
714 struct mddev *mddev = &rs->md;
715
716 mddev->new_level = mddev->level;
717 mddev->new_layout = mddev->layout;
718 mddev->new_chunk_sectors = mddev->chunk_sectors;
719}
720
721/*
722 * Set the mddev properties in @rs to the new
723 * ones requested by the ctr
724 */
725static void rs_set_new(struct raid_set *rs)
726{
727 struct mddev *mddev = &rs->md;
728
729 mddev->level = mddev->new_level;
730 mddev->layout = mddev->new_layout;
731 mddev->chunk_sectors = mddev->new_chunk_sectors;
732 mddev->raid_disks = rs->raid_disks;
733 mddev->delta_disks = 0;
734}
735
736static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *raid_type,
737 unsigned int raid_devs)
738{
739 unsigned int i;
740 struct raid_set *rs;
741
742 if (raid_devs <= raid_type->parity_devs) {
743 ti->error = "Insufficient number of devices";
744 return ERR_PTR(-EINVAL);
745 }
746
747 rs = kzalloc(struct_size(rs, dev, raid_devs), GFP_KERNEL);
748 if (!rs) {
749 ti->error = "Cannot allocate raid context";
750 return ERR_PTR(-ENOMEM);
751 }
752
753 if (mddev_init(&rs->md)) {
754 kfree(rs);
755 ti->error = "Cannot initialize raid context";
756 return ERR_PTR(-ENOMEM);
757 }
758
759 rs->raid_disks = raid_devs;
760 rs->delta_disks = 0;
761
762 rs->ti = ti;
763 rs->raid_type = raid_type;
764 rs->stripe_cache_entries = 256;
765 rs->md.raid_disks = raid_devs;
766 rs->md.level = raid_type->level;
767 rs->md.new_level = rs->md.level;
768 rs->md.layout = raid_type->algorithm;
769 rs->md.new_layout = rs->md.layout;
770 rs->md.delta_disks = 0;
771 rs->md.recovery_cp = MaxSector;
772
773 for (i = 0; i < raid_devs; i++)
774 md_rdev_init(&rs->dev[i].rdev);
775
776 /*
777 * Remaining items to be initialized by further RAID params:
778 * rs->md.persistent
779 * rs->md.external
780 * rs->md.chunk_sectors
781 * rs->md.new_chunk_sectors
782 * rs->md.dev_sectors
783 */
784
785 return rs;
786}
787
788/* Free all @rs allocations */
789static void raid_set_free(struct raid_set *rs)
790{
791 int i;
792
793 if (rs->journal_dev.dev) {
794 md_rdev_clear(&rs->journal_dev.rdev);
795 dm_put_device(rs->ti, rs->journal_dev.dev);
796 }
797
798 for (i = 0; i < rs->raid_disks; i++) {
799 if (rs->dev[i].meta_dev)
800 dm_put_device(rs->ti, rs->dev[i].meta_dev);
801 md_rdev_clear(&rs->dev[i].rdev);
802 if (rs->dev[i].data_dev)
803 dm_put_device(rs->ti, rs->dev[i].data_dev);
804 }
805
806 mddev_destroy(&rs->md);
807 kfree(rs);
808}
809
810/*
811 * For every device we have two words
812 * <meta_dev>: meta device name or '-' if missing
813 * <data_dev>: data device name or '-' if missing
814 *
815 * The following are permitted:
816 * - -
817 * - <data_dev>
818 * <meta_dev> <data_dev>
819 *
820 * The following is not allowed:
821 * <meta_dev> -
822 *
823 * This code parses those words. If there is a failure,
824 * the caller must use raid_set_free() to unwind the operations.
825 */
826static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as)
827{
828 int i;
829 int rebuild = 0;
830 int metadata_available = 0;
831 int r = 0;
832 const char *arg;
833
834 /* Put off the number of raid devices argument to get to dev pairs */
835 arg = dm_shift_arg(as);
836 if (!arg)
837 return -EINVAL;
838
839 for (i = 0; i < rs->raid_disks; i++) {
840 rs->dev[i].rdev.raid_disk = i;
841
842 rs->dev[i].meta_dev = NULL;
843 rs->dev[i].data_dev = NULL;
844
845 /*
846 * There are no offsets initially.
847 * Out of place reshape will set them accordingly.
848 */
849 rs->dev[i].rdev.data_offset = 0;
850 rs->dev[i].rdev.new_data_offset = 0;
851 rs->dev[i].rdev.mddev = &rs->md;
852
853 arg = dm_shift_arg(as);
854 if (!arg)
855 return -EINVAL;
856
857 if (strcmp(arg, "-")) {
858 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
859 &rs->dev[i].meta_dev);
860 if (r) {
861 rs->ti->error = "RAID metadata device lookup failure";
862 return r;
863 }
864
865 rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
866 if (!rs->dev[i].rdev.sb_page) {
867 rs->ti->error = "Failed to allocate superblock page";
868 return -ENOMEM;
869 }
870 }
871
872 arg = dm_shift_arg(as);
873 if (!arg)
874 return -EINVAL;
875
876 if (!strcmp(arg, "-")) {
877 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
878 (!rs->dev[i].rdev.recovery_offset)) {
879 rs->ti->error = "Drive designated for rebuild not specified";
880 return -EINVAL;
881 }
882
883 if (rs->dev[i].meta_dev) {
884 rs->ti->error = "No data device supplied with metadata device";
885 return -EINVAL;
886 }
887
888 continue;
889 }
890
891 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
892 &rs->dev[i].data_dev);
893 if (r) {
894 rs->ti->error = "RAID device lookup failure";
895 return r;
896 }
897
898 if (rs->dev[i].meta_dev) {
899 metadata_available = 1;
900 rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
901 }
902 rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
903 list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks);
904 if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
905 rebuild++;
906 }
907
908 if (rs->journal_dev.dev)
909 list_add_tail(&rs->journal_dev.rdev.same_set, &rs->md.disks);
910
911 if (metadata_available) {
912 rs->md.external = 0;
913 rs->md.persistent = 1;
914 rs->md.major_version = 2;
915 } else if (rebuild && !rs->md.recovery_cp) {
916 /*
917 * Without metadata, we will not be able to tell if the array
918 * is in-sync or not - we must assume it is not. Therefore,
919 * it is impossible to rebuild a drive.
920 *
921 * Even if there is metadata, the on-disk information may
922 * indicate that the array is not in-sync and it will then
923 * fail at that time.
924 *
925 * User could specify 'nosync' option if desperate.
926 */
927 rs->ti->error = "Unable to rebuild drive while array is not in-sync";
928 return -EINVAL;
929 }
930
931 return 0;
932}
933
934/*
935 * validate_region_size
936 * @rs
937 * @region_size: region size in sectors. If 0, pick a size (4MiB default).
938 *
939 * Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
940 * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
941 *
942 * Returns: 0 on success, -EINVAL on failure.
943 */
944static int validate_region_size(struct raid_set *rs, unsigned long region_size)
945{
946 unsigned long min_region_size = rs->ti->len / (1 << 21);
947
948 if (rs_is_raid0(rs))
949 return 0;
950
951 if (!region_size) {
952 /*
953 * Choose a reasonable default. All figures in sectors.
954 */
955 if (min_region_size > (1 << 13)) {
956 /* If not a power of 2, make it the next power of 2 */
957 region_size = roundup_pow_of_two(min_region_size);
958 DMINFO("Choosing default region size of %lu sectors",
959 region_size);
960 } else {
961 DMINFO("Choosing default region size of 4MiB");
962 region_size = 1 << 13; /* sectors */
963 }
964 } else {
965 /*
966 * Validate user-supplied value.
967 */
968 if (region_size > rs->ti->len) {
969 rs->ti->error = "Supplied region size is too large";
970 return -EINVAL;
971 }
972
973 if (region_size < min_region_size) {
974 DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
975 region_size, min_region_size);
976 rs->ti->error = "Supplied region size is too small";
977 return -EINVAL;
978 }
979
980 if (!is_power_of_2(region_size)) {
981 rs->ti->error = "Region size is not a power of 2";
982 return -EINVAL;
983 }
984
985 if (region_size < rs->md.chunk_sectors) {
986 rs->ti->error = "Region size is smaller than the chunk size";
987 return -EINVAL;
988 }
989 }
990
991 /*
992 * Convert sectors to bytes.
993 */
994 rs->md.bitmap_info.chunksize = to_bytes(region_size);
995
996 return 0;
997}
998
999/*
1000 * validate_raid_redundancy
1001 * @rs
1002 *
1003 * Determine if there are enough devices in the array that haven't
1004 * failed (or are being rebuilt) to form a usable array.
1005 *
1006 * Returns: 0 on success, -EINVAL on failure.
1007 */
1008static int validate_raid_redundancy(struct raid_set *rs)
1009{
1010 unsigned int i, rebuild_cnt = 0;
1011 unsigned int rebuilds_per_group = 0, copies, raid_disks;
1012 unsigned int group_size, last_group_start;
1013
1014 for (i = 0; i < rs->raid_disks; i++)
1015 if (!test_bit(FirstUse, &rs->dev[i].rdev.flags) &&
1016 ((!test_bit(In_sync, &rs->dev[i].rdev.flags) ||
1017 !rs->dev[i].rdev.sb_page)))
1018 rebuild_cnt++;
1019
1020 switch (rs->md.level) {
1021 case 0:
1022 break;
1023 case 1:
1024 if (rebuild_cnt >= rs->md.raid_disks)
1025 goto too_many;
1026 break;
1027 case 4:
1028 case 5:
1029 case 6:
1030 if (rebuild_cnt > rs->raid_type->parity_devs)
1031 goto too_many;
1032 break;
1033 case 10:
1034 copies = raid10_md_layout_to_copies(rs->md.new_layout);
1035 if (copies < 2) {
1036 DMERR("Bogus raid10 data copies < 2!");
1037 return -EINVAL;
1038 }
1039
1040 if (rebuild_cnt < copies)
1041 break;
1042
1043 /*
1044 * It is possible to have a higher rebuild count for RAID10,
1045 * as long as the failed devices occur in different mirror
1046 * groups (i.e. different stripes).
1047 *
1048 * When checking "near" format, make sure no adjacent devices
1049 * have failed beyond what can be handled. In addition to the
1050 * simple case where the number of devices is a multiple of the
1051 * number of copies, we must also handle cases where the number
1052 * of devices is not a multiple of the number of copies.
1053 * E.g. dev1 dev2 dev3 dev4 dev5
1054 * A A B B C
1055 * C D D E E
1056 */
1057 raid_disks = min(rs->raid_disks, rs->md.raid_disks);
1058 if (__is_raid10_near(rs->md.new_layout)) {
1059 for (i = 0; i < raid_disks; i++) {
1060 if (!(i % copies))
1061 rebuilds_per_group = 0;
1062 if ((!rs->dev[i].rdev.sb_page ||
1063 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
1064 (++rebuilds_per_group >= copies))
1065 goto too_many;
1066 }
1067 break;
1068 }
1069
1070 /*
1071 * When checking "far" and "offset" formats, we need to ensure
1072 * that the device that holds its copy is not also dead or
1073 * being rebuilt. (Note that "far" and "offset" formats only
1074 * support two copies right now. These formats also only ever
1075 * use the 'use_far_sets' variant.)
1076 *
1077 * This check is somewhat complicated by the need to account
1078 * for arrays that are not a multiple of (far) copies. This
1079 * results in the need to treat the last (potentially larger)
1080 * set differently.
1081 */
1082 group_size = (raid_disks / copies);
1083 last_group_start = (raid_disks / group_size) - 1;
1084 last_group_start *= group_size;
1085 for (i = 0; i < raid_disks; i++) {
1086 if (!(i % copies) && !(i > last_group_start))
1087 rebuilds_per_group = 0;
1088 if ((!rs->dev[i].rdev.sb_page ||
1089 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
1090 (++rebuilds_per_group >= copies))
1091 goto too_many;
1092 }
1093 break;
1094 default:
1095 if (rebuild_cnt)
1096 return -EINVAL;
1097 }
1098
1099 return 0;
1100
1101too_many:
1102 return -EINVAL;
1103}
1104
1105/*
1106 * Possible arguments are...
1107 * <chunk_size> [optional_args]
1108 *
1109 * Argument definitions
1110 * <chunk_size> The number of sectors per disk that
1111 * will form the "stripe"
1112 * [[no]sync] Force or prevent recovery of the
1113 * entire array
1114 * [rebuild <idx>] Rebuild the drive indicated by the index
1115 * [daemon_sleep <ms>] Time between bitmap daemon work to
1116 * clear bits
1117 * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1118 * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1119 * [write_mostly <idx>] Indicate a write mostly drive via index
1120 * [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
1121 * [stripe_cache <sectors>] Stripe cache size for higher RAIDs
1122 * [region_size <sectors>] Defines granularity of bitmap
1123 * [journal_dev <dev>] raid4/5/6 journaling deviice
1124 * (i.e. write hole closing log)
1125 *
1126 * RAID10-only options:
1127 * [raid10_copies <# copies>] Number of copies. (Default: 2)
1128 * [raid10_format <near|far|offset>] Layout algorithm. (Default: near)
1129 */
1130static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
1131 unsigned int num_raid_params)
1132{
1133 int value, raid10_format = ALGORITHM_RAID10_DEFAULT;
1134 unsigned int raid10_copies = 2;
1135 unsigned int i, write_mostly = 0;
1136 unsigned int region_size = 0;
1137 sector_t max_io_len;
1138 const char *arg, *key;
1139 struct raid_dev *rd;
1140 struct raid_type *rt = rs->raid_type;
1141
1142 arg = dm_shift_arg(as);
1143 num_raid_params--; /* Account for chunk_size argument */
1144
1145 if (kstrtoint(arg, 10, &value) < 0) {
1146 rs->ti->error = "Bad numerical argument given for chunk_size";
1147 return -EINVAL;
1148 }
1149
1150 /*
1151 * First, parse the in-order required arguments
1152 * "chunk_size" is the only argument of this type.
1153 */
1154 if (rt_is_raid1(rt)) {
1155 if (value)
1156 DMERR("Ignoring chunk size parameter for RAID 1");
1157 value = 0;
1158 } else if (!is_power_of_2(value)) {
1159 rs->ti->error = "Chunk size must be a power of 2";
1160 return -EINVAL;
1161 } else if (value < 8) {
1162 rs->ti->error = "Chunk size value is too small";
1163 return -EINVAL;
1164 }
1165
1166 rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
1167
1168 /*
1169 * We set each individual device as In_sync with a completed
1170 * 'recovery_offset'. If there has been a device failure or
1171 * replacement then one of the following cases applies:
1172 *
1173 * 1) User specifies 'rebuild'.
1174 * - Device is reset when param is read.
1175 * 2) A new device is supplied.
1176 * - No matching superblock found, resets device.
1177 * 3) Device failure was transient and returns on reload.
1178 * - Failure noticed, resets device for bitmap replay.
1179 * 4) Device hadn't completed recovery after previous failure.
1180 * - Superblock is read and overrides recovery_offset.
1181 *
1182 * What is found in the superblocks of the devices is always
1183 * authoritative, unless 'rebuild' or '[no]sync' was specified.
1184 */
1185 for (i = 0; i < rs->raid_disks; i++) {
1186 set_bit(In_sync, &rs->dev[i].rdev.flags);
1187 rs->dev[i].rdev.recovery_offset = MaxSector;
1188 }
1189
1190 /*
1191 * Second, parse the unordered optional arguments
1192 */
1193 for (i = 0; i < num_raid_params; i++) {
1194 key = dm_shift_arg(as);
1195 if (!key) {
1196 rs->ti->error = "Not enough raid parameters given";
1197 return -EINVAL;
1198 }
1199
1200 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) {
1201 if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1202 rs->ti->error = "Only one 'nosync' argument allowed";
1203 return -EINVAL;
1204 }
1205 continue;
1206 }
1207 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) {
1208 if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) {
1209 rs->ti->error = "Only one 'sync' argument allowed";
1210 return -EINVAL;
1211 }
1212 continue;
1213 }
1214 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) {
1215 if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
1216 rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed";
1217 return -EINVAL;
1218 }
1219 continue;
1220 }
1221
1222 arg = dm_shift_arg(as);
1223 i++; /* Account for the argument pairs */
1224 if (!arg) {
1225 rs->ti->error = "Wrong number of raid parameters given";
1226 return -EINVAL;
1227 }
1228
1229 /*
1230 * Parameters that take a string value are checked here.
1231 */
1232 /* "raid10_format {near|offset|far} */
1233 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) {
1234 if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) {
1235 rs->ti->error = "Only one 'raid10_format' argument pair allowed";
1236 return -EINVAL;
1237 }
1238 if (!rt_is_raid10(rt)) {
1239 rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type";
1240 return -EINVAL;
1241 }
1242 raid10_format = raid10_name_to_format(arg);
1243 if (raid10_format < 0) {
1244 rs->ti->error = "Invalid 'raid10_format' value given";
1245 return raid10_format;
1246 }
1247 continue;
1248 }
1249
1250 /* "journal_dev <dev>" */
1251 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV))) {
1252 int r;
1253 struct md_rdev *jdev;
1254
1255 if (test_and_set_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
1256 rs->ti->error = "Only one raid4/5/6 set journaling device allowed";
1257 return -EINVAL;
1258 }
1259 if (!rt_is_raid456(rt)) {
1260 rs->ti->error = "'journal_dev' is an invalid parameter for this RAID type";
1261 return -EINVAL;
1262 }
1263 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
1264 &rs->journal_dev.dev);
1265 if (r) {
1266 rs->ti->error = "raid4/5/6 journal device lookup failure";
1267 return r;
1268 }
1269 jdev = &rs->journal_dev.rdev;
1270 md_rdev_init(jdev);
1271 jdev->mddev = &rs->md;
1272 jdev->bdev = rs->journal_dev.dev->bdev;
1273 jdev->sectors = bdev_nr_sectors(jdev->bdev);
1274 if (jdev->sectors < MIN_RAID456_JOURNAL_SPACE) {
1275 rs->ti->error = "No space for raid4/5/6 journal";
1276 return -ENOSPC;
1277 }
1278 rs->journal_dev.mode = R5C_JOURNAL_MODE_WRITE_THROUGH;
1279 set_bit(Journal, &jdev->flags);
1280 continue;
1281 }
1282
1283 /* "journal_mode <mode>" ("journal_dev" mandatory!) */
1284 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE))) {
1285 int r;
1286
1287 if (!test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
1288 rs->ti->error = "raid4/5/6 'journal_mode' is invalid without 'journal_dev'";
1289 return -EINVAL;
1290 }
1291 if (test_and_set_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
1292 rs->ti->error = "Only one raid4/5/6 'journal_mode' argument allowed";
1293 return -EINVAL;
1294 }
1295 r = dm_raid_journal_mode_to_md(arg);
1296 if (r < 0) {
1297 rs->ti->error = "Invalid 'journal_mode' argument";
1298 return r;
1299 }
1300 rs->journal_dev.mode = r;
1301 continue;
1302 }
1303
1304 /*
1305 * Parameters with number values from here on.
1306 */
1307 if (kstrtoint(arg, 10, &value) < 0) {
1308 rs->ti->error = "Bad numerical argument given in raid params";
1309 return -EINVAL;
1310 }
1311
1312 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) {
1313 /*
1314 * "rebuild" is being passed in by userspace to provide
1315 * indexes of replaced devices and to set up additional
1316 * devices on raid level takeover.
1317 */
1318 if (!__within_range(value, 0, rs->raid_disks - 1)) {
1319 rs->ti->error = "Invalid rebuild index given";
1320 return -EINVAL;
1321 }
1322
1323 if (test_and_set_bit(value, (void *) rs->rebuild_disks)) {
1324 rs->ti->error = "rebuild for this index already given";
1325 return -EINVAL;
1326 }
1327
1328 rd = rs->dev + value;
1329 clear_bit(In_sync, &rd->rdev.flags);
1330 clear_bit(Faulty, &rd->rdev.flags);
1331 rd->rdev.recovery_offset = 0;
1332 set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags);
1333 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) {
1334 if (!rt_is_raid1(rt)) {
1335 rs->ti->error = "write_mostly option is only valid for RAID1";
1336 return -EINVAL;
1337 }
1338
1339 if (!__within_range(value, 0, rs->md.raid_disks - 1)) {
1340 rs->ti->error = "Invalid write_mostly index given";
1341 return -EINVAL;
1342 }
1343
1344 write_mostly++;
1345 set_bit(WriteMostly, &rs->dev[value].rdev.flags);
1346 set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags);
1347 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) {
1348 if (!rt_is_raid1(rt)) {
1349 rs->ti->error = "max_write_behind option is only valid for RAID1";
1350 return -EINVAL;
1351 }
1352
1353 if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) {
1354 rs->ti->error = "Only one max_write_behind argument pair allowed";
1355 return -EINVAL;
1356 }
1357
1358 /*
1359 * In device-mapper, we specify things in sectors, but
1360 * MD records this value in kB
1361 */
1362 if (value < 0 || value / 2 > COUNTER_MAX) {
1363 rs->ti->error = "Max write-behind limit out of range";
1364 return -EINVAL;
1365 }
1366
1367 rs->md.bitmap_info.max_write_behind = value / 2;
1368 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) {
1369 if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) {
1370 rs->ti->error = "Only one daemon_sleep argument pair allowed";
1371 return -EINVAL;
1372 }
1373 if (value < 0) {
1374 rs->ti->error = "daemon sleep period out of range";
1375 return -EINVAL;
1376 }
1377 rs->md.bitmap_info.daemon_sleep = value;
1378 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) {
1379 /* Userspace passes new data_offset after having extended the data image LV */
1380 if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
1381 rs->ti->error = "Only one data_offset argument pair allowed";
1382 return -EINVAL;
1383 }
1384 /* Ensure sensible data offset */
1385 if (value < 0 ||
1386 (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) {
1387 rs->ti->error = "Bogus data_offset value";
1388 return -EINVAL;
1389 }
1390 rs->data_offset = value;
1391 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) {
1392 /* Define the +/-# of disks to add to/remove from the given raid set */
1393 if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
1394 rs->ti->error = "Only one delta_disks argument pair allowed";
1395 return -EINVAL;
1396 }
1397 /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */
1398 if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) {
1399 rs->ti->error = "Too many delta_disk requested";
1400 return -EINVAL;
1401 }
1402
1403 rs->delta_disks = value;
1404 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) {
1405 if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) {
1406 rs->ti->error = "Only one stripe_cache argument pair allowed";
1407 return -EINVAL;
1408 }
1409
1410 if (!rt_is_raid456(rt)) {
1411 rs->ti->error = "Inappropriate argument: stripe_cache";
1412 return -EINVAL;
1413 }
1414
1415 if (value < 0) {
1416 rs->ti->error = "Bogus stripe cache entries value";
1417 return -EINVAL;
1418 }
1419 rs->stripe_cache_entries = value;
1420 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) {
1421 if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
1422 rs->ti->error = "Only one min_recovery_rate argument pair allowed";
1423 return -EINVAL;
1424 }
1425
1426 if (value < 0) {
1427 rs->ti->error = "min_recovery_rate out of range";
1428 return -EINVAL;
1429 }
1430 rs->md.sync_speed_min = value;
1431 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) {
1432 if (test_and_set_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) {
1433 rs->ti->error = "Only one max_recovery_rate argument pair allowed";
1434 return -EINVAL;
1435 }
1436
1437 if (value < 0) {
1438 rs->ti->error = "max_recovery_rate out of range";
1439 return -EINVAL;
1440 }
1441 rs->md.sync_speed_max = value;
1442 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) {
1443 if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) {
1444 rs->ti->error = "Only one region_size argument pair allowed";
1445 return -EINVAL;
1446 }
1447
1448 region_size = value;
1449 rs->requested_bitmap_chunk_sectors = value;
1450 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) {
1451 if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) {
1452 rs->ti->error = "Only one raid10_copies argument pair allowed";
1453 return -EINVAL;
1454 }
1455
1456 if (!__within_range(value, 2, rs->md.raid_disks)) {
1457 rs->ti->error = "Bad value for 'raid10_copies'";
1458 return -EINVAL;
1459 }
1460
1461 raid10_copies = value;
1462 } else {
1463 DMERR("Unable to parse RAID parameter: %s", key);
1464 rs->ti->error = "Unable to parse RAID parameter";
1465 return -EINVAL;
1466 }
1467 }
1468
1469 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) &&
1470 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1471 rs->ti->error = "sync and nosync are mutually exclusive";
1472 return -EINVAL;
1473 }
1474
1475 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) &&
1476 (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ||
1477 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))) {
1478 rs->ti->error = "sync/nosync and rebuild are mutually exclusive";
1479 return -EINVAL;
1480 }
1481
1482 if (write_mostly >= rs->md.raid_disks) {
1483 rs->ti->error = "Can't set all raid1 devices to write_mostly";
1484 return -EINVAL;
1485 }
1486
1487 if (rs->md.sync_speed_max &&
1488 rs->md.sync_speed_min > rs->md.sync_speed_max) {
1489 rs->ti->error = "Bogus recovery rates";
1490 return -EINVAL;
1491 }
1492
1493 if (validate_region_size(rs, region_size))
1494 return -EINVAL;
1495
1496 if (rs->md.chunk_sectors)
1497 max_io_len = rs->md.chunk_sectors;
1498 else
1499 max_io_len = region_size;
1500
1501 if (dm_set_target_max_io_len(rs->ti, max_io_len))
1502 return -EINVAL;
1503
1504 if (rt_is_raid10(rt)) {
1505 if (raid10_copies > rs->md.raid_disks) {
1506 rs->ti->error = "Not enough devices to satisfy specification";
1507 return -EINVAL;
1508 }
1509
1510 rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies);
1511 if (rs->md.new_layout < 0) {
1512 rs->ti->error = "Error getting raid10 format";
1513 return rs->md.new_layout;
1514 }
1515
1516 rt = get_raid_type_by_ll(10, rs->md.new_layout);
1517 if (!rt) {
1518 rs->ti->error = "Failed to recognize new raid10 layout";
1519 return -EINVAL;
1520 }
1521
1522 if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT ||
1523 rt->algorithm == ALGORITHM_RAID10_NEAR) &&
1524 test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
1525 rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible";
1526 return -EINVAL;
1527 }
1528 }
1529
1530 rs->raid10_copies = raid10_copies;
1531
1532 /* Assume there are no metadata devices until the drives are parsed */
1533 rs->md.persistent = 0;
1534 rs->md.external = 1;
1535
1536 /* Check, if any invalid ctr arguments have been passed in for the raid level */
1537 return rs_check_for_valid_flags(rs);
1538}
1539
1540/* Set raid4/5/6 cache size */
1541static int rs_set_raid456_stripe_cache(struct raid_set *rs)
1542{
1543 int r;
1544 struct r5conf *conf;
1545 struct mddev *mddev = &rs->md;
1546 uint32_t min_stripes = max(mddev->chunk_sectors, mddev->new_chunk_sectors) / 2;
1547 uint32_t nr_stripes = rs->stripe_cache_entries;
1548
1549 if (!rt_is_raid456(rs->raid_type)) {
1550 rs->ti->error = "Inappropriate raid level; cannot change stripe_cache size";
1551 return -EINVAL;
1552 }
1553
1554 if (nr_stripes < min_stripes) {
1555 DMINFO("Adjusting requested %u stripe cache entries to %u to suit stripe size",
1556 nr_stripes, min_stripes);
1557 nr_stripes = min_stripes;
1558 }
1559
1560 conf = mddev->private;
1561 if (!conf) {
1562 rs->ti->error = "Cannot change stripe_cache size on inactive RAID set";
1563 return -EINVAL;
1564 }
1565
1566 /* Try setting number of stripes in raid456 stripe cache */
1567 if (conf->min_nr_stripes != nr_stripes) {
1568 r = raid5_set_cache_size(mddev, nr_stripes);
1569 if (r) {
1570 rs->ti->error = "Failed to set raid4/5/6 stripe cache size";
1571 return r;
1572 }
1573
1574 DMINFO("%u stripe cache entries", nr_stripes);
1575 }
1576
1577 return 0;
1578}
1579
1580/* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */
1581static unsigned int mddev_data_stripes(struct raid_set *rs)
1582{
1583 return rs->md.raid_disks - rs->raid_type->parity_devs;
1584}
1585
1586/* Return # of data stripes of @rs (i.e. as of ctr) */
1587static unsigned int rs_data_stripes(struct raid_set *rs)
1588{
1589 return rs->raid_disks - rs->raid_type->parity_devs;
1590}
1591
1592/*
1593 * Retrieve rdev->sectors from any valid raid device of @rs
1594 * to allow userpace to pass in arbitray "- -" device tupples.
1595 */
1596static sector_t __rdev_sectors(struct raid_set *rs)
1597{
1598 int i;
1599
1600 for (i = 0; i < rs->raid_disks; i++) {
1601 struct md_rdev *rdev = &rs->dev[i].rdev;
1602
1603 if (!test_bit(Journal, &rdev->flags) &&
1604 rdev->bdev && rdev->sectors)
1605 return rdev->sectors;
1606 }
1607
1608 return 0;
1609}
1610
1611/* Check that calculated dev_sectors fits all component devices. */
1612static int _check_data_dev_sectors(struct raid_set *rs)
1613{
1614 sector_t ds = ~0;
1615 struct md_rdev *rdev;
1616
1617 rdev_for_each(rdev, &rs->md)
1618 if (!test_bit(Journal, &rdev->flags) && rdev->bdev) {
1619 ds = min(ds, bdev_nr_sectors(rdev->bdev));
1620 if (ds < rs->md.dev_sectors) {
1621 rs->ti->error = "Component device(s) too small";
1622 return -EINVAL;
1623 }
1624 }
1625
1626 return 0;
1627}
1628
1629/* Get reshape sectors from data_offsets or raid set */
1630static sector_t _get_reshape_sectors(struct raid_set *rs)
1631{
1632 struct md_rdev *rdev;
1633 sector_t reshape_sectors = 0;
1634
1635 rdev_for_each(rdev, &rs->md)
1636 if (!test_bit(Journal, &rdev->flags)) {
1637 reshape_sectors = (rdev->data_offset > rdev->new_data_offset) ?
1638 rdev->data_offset - rdev->new_data_offset :
1639 rdev->new_data_offset - rdev->data_offset;
1640 break;
1641 }
1642
1643 return max(reshape_sectors, (sector_t) rs->data_offset);
1644}
1645
1646/* Calculate the sectors per device and per array used for @rs */
1647static int rs_set_dev_and_array_sectors(struct raid_set *rs, sector_t sectors, bool use_mddev)
1648{
1649 int delta_disks;
1650 unsigned int data_stripes;
1651 sector_t array_sectors = sectors, dev_sectors = sectors;
1652 struct mddev *mddev = &rs->md;
1653
1654 if (use_mddev) {
1655 delta_disks = mddev->delta_disks;
1656 data_stripes = mddev_data_stripes(rs);
1657 } else {
1658 delta_disks = rs->delta_disks;
1659 data_stripes = rs_data_stripes(rs);
1660 }
1661
1662 /* Special raid1 case w/o delta_disks support (yet) */
1663 if (rt_is_raid1(rs->raid_type))
1664 ;
1665 else if (rt_is_raid10(rs->raid_type)) {
1666 if (rs->raid10_copies < 2 ||
1667 delta_disks < 0) {
1668 rs->ti->error = "Bogus raid10 data copies or delta disks";
1669 return -EINVAL;
1670 }
1671
1672 dev_sectors *= rs->raid10_copies;
1673 if (sector_div(dev_sectors, data_stripes))
1674 goto bad;
1675
1676 array_sectors = (data_stripes + delta_disks) * (dev_sectors - _get_reshape_sectors(rs));
1677 if (sector_div(array_sectors, rs->raid10_copies))
1678 goto bad;
1679
1680 } else if (sector_div(dev_sectors, data_stripes))
1681 goto bad;
1682
1683 else
1684 /* Striped layouts */
1685 array_sectors = (data_stripes + delta_disks) * (dev_sectors - _get_reshape_sectors(rs));
1686
1687 mddev->array_sectors = array_sectors;
1688 mddev->dev_sectors = dev_sectors;
1689 rs_set_rdev_sectors(rs);
1690
1691 return _check_data_dev_sectors(rs);
1692bad:
1693 rs->ti->error = "Target length not divisible by number of data devices";
1694 return -EINVAL;
1695}
1696
1697/* Setup recovery on @rs */
1698static void rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors)
1699{
1700 /* raid0 does not recover */
1701 if (rs_is_raid0(rs))
1702 rs->md.recovery_cp = MaxSector;
1703 /*
1704 * A raid6 set has to be recovered either
1705 * completely or for the grown part to
1706 * ensure proper parity and Q-Syndrome
1707 */
1708 else if (rs_is_raid6(rs))
1709 rs->md.recovery_cp = dev_sectors;
1710 /*
1711 * Other raid set types may skip recovery
1712 * depending on the 'nosync' flag.
1713 */
1714 else
1715 rs->md.recovery_cp = test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)
1716 ? MaxSector : dev_sectors;
1717}
1718
1719static void do_table_event(struct work_struct *ws)
1720{
1721 struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
1722
1723 smp_rmb(); /* Make sure we access most actual mddev properties */
1724
1725 /* Only grow size resulting from added stripe(s) after reshape ended. */
1726 if (!rs_is_reshaping(rs) &&
1727 rs->array_sectors > rs->md.array_sectors &&
1728 !rs->md.delta_disks &&
1729 rs->md.raid_disks == rs->raid_disks) {
1730 /* The raid10 personality doesn't provide proper device sizes -> correct. */
1731 if (rs_is_raid10(rs))
1732 rs_set_rdev_sectors(rs);
1733
1734 rs->md.array_sectors = rs->array_sectors;
1735 rs_set_capacity(rs);
1736 }
1737
1738 dm_table_event(rs->ti->table);
1739}
1740
1741/*
1742 * Make sure a valid takover (level switch) is being requested on @rs
1743 *
1744 * Conversions of raid sets from one MD personality to another
1745 * have to conform to restrictions which are enforced here.
1746 */
1747static int rs_check_takeover(struct raid_set *rs)
1748{
1749 struct mddev *mddev = &rs->md;
1750 unsigned int near_copies;
1751
1752 if (rs->md.degraded) {
1753 rs->ti->error = "Can't takeover degraded raid set";
1754 return -EPERM;
1755 }
1756
1757 if (rs_is_reshaping(rs)) {
1758 rs->ti->error = "Can't takeover reshaping raid set";
1759 return -EPERM;
1760 }
1761
1762 switch (mddev->level) {
1763 case 0:
1764 /* raid0 -> raid1/5 with one disk */
1765 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1766 mddev->raid_disks == 1)
1767 return 0;
1768
1769 /* raid0 -> raid10 */
1770 if (mddev->new_level == 10 &&
1771 !(rs->raid_disks % mddev->raid_disks))
1772 return 0;
1773
1774 /* raid0 with multiple disks -> raid4/5/6 */
1775 if (__within_range(mddev->new_level, 4, 6) &&
1776 mddev->new_layout == ALGORITHM_PARITY_N &&
1777 mddev->raid_disks > 1)
1778 return 0;
1779
1780 break;
1781
1782 case 10:
1783 /* Can't takeover raid10_offset! */
1784 if (__is_raid10_offset(mddev->layout))
1785 break;
1786
1787 near_copies = __raid10_near_copies(mddev->layout);
1788
1789 /* raid10* -> raid0 */
1790 if (mddev->new_level == 0) {
1791 /* Can takeover raid10_near with raid disks divisable by data copies! */
1792 if (near_copies > 1 &&
1793 !(mddev->raid_disks % near_copies)) {
1794 mddev->raid_disks /= near_copies;
1795 mddev->delta_disks = mddev->raid_disks;
1796 return 0;
1797 }
1798
1799 /* Can takeover raid10_far */
1800 if (near_copies == 1 &&
1801 __raid10_far_copies(mddev->layout) > 1)
1802 return 0;
1803
1804 break;
1805 }
1806
1807 /* raid10_{near,far} -> raid1 */
1808 if (mddev->new_level == 1 &&
1809 max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks)
1810 return 0;
1811
1812 /* raid10_{near,far} with 2 disks -> raid4/5 */
1813 if (__within_range(mddev->new_level, 4, 5) &&
1814 mddev->raid_disks == 2)
1815 return 0;
1816 break;
1817
1818 case 1:
1819 /* raid1 with 2 disks -> raid4/5 */
1820 if (__within_range(mddev->new_level, 4, 5) &&
1821 mddev->raid_disks == 2) {
1822 mddev->degraded = 1;
1823 return 0;
1824 }
1825
1826 /* raid1 -> raid0 */
1827 if (mddev->new_level == 0 &&
1828 mddev->raid_disks == 1)
1829 return 0;
1830
1831 /* raid1 -> raid10 */
1832 if (mddev->new_level == 10)
1833 return 0;
1834 break;
1835
1836 case 4:
1837 /* raid4 -> raid0 */
1838 if (mddev->new_level == 0)
1839 return 0;
1840
1841 /* raid4 -> raid1/5 with 2 disks */
1842 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1843 mddev->raid_disks == 2)
1844 return 0;
1845
1846 /* raid4 -> raid5/6 with parity N */
1847 if (__within_range(mddev->new_level, 5, 6) &&
1848 mddev->layout == ALGORITHM_PARITY_N)
1849 return 0;
1850 break;
1851
1852 case 5:
1853 /* raid5 with parity N -> raid0 */
1854 if (mddev->new_level == 0 &&
1855 mddev->layout == ALGORITHM_PARITY_N)
1856 return 0;
1857
1858 /* raid5 with parity N -> raid4 */
1859 if (mddev->new_level == 4 &&
1860 mddev->layout == ALGORITHM_PARITY_N)
1861 return 0;
1862
1863 /* raid5 with 2 disks -> raid1/4/10 */
1864 if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) &&
1865 mddev->raid_disks == 2)
1866 return 0;
1867
1868 /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */
1869 if (mddev->new_level == 6 &&
1870 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
1871 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6)))
1872 return 0;
1873 break;
1874
1875 case 6:
1876 /* raid6 with parity N -> raid0 */
1877 if (mddev->new_level == 0 &&
1878 mddev->layout == ALGORITHM_PARITY_N)
1879 return 0;
1880
1881 /* raid6 with parity N -> raid4 */
1882 if (mddev->new_level == 4 &&
1883 mddev->layout == ALGORITHM_PARITY_N)
1884 return 0;
1885
1886 /* raid6_*_n with Q-Syndrome N -> raid5_* */
1887 if (mddev->new_level == 5 &&
1888 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
1889 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC)))
1890 return 0;
1891 break;
1892
1893 default:
1894 break;
1895 }
1896
1897 rs->ti->error = "takeover not possible";
1898 return -EINVAL;
1899}
1900
1901/* True if @rs requested to be taken over */
1902static bool rs_takeover_requested(struct raid_set *rs)
1903{
1904 return rs->md.new_level != rs->md.level;
1905}
1906
1907/* True if layout is set to reshape. */
1908static bool rs_is_layout_change(struct raid_set *rs, bool use_mddev)
1909{
1910 return (use_mddev ? rs->md.delta_disks : rs->delta_disks) ||
1911 rs->md.new_layout != rs->md.layout ||
1912 rs->md.new_chunk_sectors != rs->md.chunk_sectors;
1913}
1914
1915/* True if @rs is requested to reshape by ctr */
1916static bool rs_reshape_requested(struct raid_set *rs)
1917{
1918 bool change;
1919 struct mddev *mddev = &rs->md;
1920
1921 if (rs_takeover_requested(rs))
1922 return false;
1923
1924 if (rs_is_raid0(rs))
1925 return false;
1926
1927 change = rs_is_layout_change(rs, false);
1928
1929 /* Historical case to support raid1 reshape without delta disks */
1930 if (rs_is_raid1(rs)) {
1931 if (rs->delta_disks)
1932 return !!rs->delta_disks;
1933
1934 return !change &&
1935 mddev->raid_disks != rs->raid_disks;
1936 }
1937
1938 if (rs_is_raid10(rs))
1939 return change &&
1940 !__is_raid10_far(mddev->new_layout) &&
1941 rs->delta_disks >= 0;
1942
1943 return change;
1944}
1945
1946/* Features */
1947#define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */
1948
1949/* State flags for sb->flags */
1950#define SB_FLAG_RESHAPE_ACTIVE 0x1
1951#define SB_FLAG_RESHAPE_BACKWARDS 0x2
1952
1953/*
1954 * This structure is never routinely used by userspace, unlike md superblocks.
1955 * Devices with this superblock should only ever be accessed via device-mapper.
1956 */
1957#define DM_RAID_MAGIC 0x64526D44
1958struct dm_raid_superblock {
1959 __le32 magic; /* "DmRd" */
1960 __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */
1961
1962 __le32 num_devices; /* Number of devices in this raid set. (Max 64) */
1963 __le32 array_position; /* The position of this drive in the raid set */
1964
1965 __le64 events; /* Incremented by md when superblock updated */
1966 __le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */
1967 /* indicate failures (see extension below) */
1968
1969 /*
1970 * This offset tracks the progress of the repair or replacement of
1971 * an individual drive.
1972 */
1973 __le64 disk_recovery_offset;
1974
1975 /*
1976 * This offset tracks the progress of the initial raid set
1977 * synchronisation/parity calculation.
1978 */
1979 __le64 array_resync_offset;
1980
1981 /*
1982 * raid characteristics
1983 */
1984 __le32 level;
1985 __le32 layout;
1986 __le32 stripe_sectors;
1987
1988 /********************************************************************
1989 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
1990 *
1991 * FEATURE_FLAG_SUPPORTS_V190 in the compat_features member indicates that those exist
1992 */
1993
1994 __le32 flags; /* Flags defining array states for reshaping */
1995
1996 /*
1997 * This offset tracks the progress of a raid
1998 * set reshape in order to be able to restart it
1999 */
2000 __le64 reshape_position;
2001
2002 /*
2003 * These define the properties of the array in case of an interrupted reshape
2004 */
2005 __le32 new_level;
2006 __le32 new_layout;
2007 __le32 new_stripe_sectors;
2008 __le32 delta_disks;
2009
2010 __le64 array_sectors; /* Array size in sectors */
2011
2012 /*
2013 * Sector offsets to data on devices (reshaping).
2014 * Needed to support out of place reshaping, thus
2015 * not writing over any stripes whilst converting
2016 * them from old to new layout
2017 */
2018 __le64 data_offset;
2019 __le64 new_data_offset;
2020
2021 __le64 sectors; /* Used device size in sectors */
2022
2023 /*
2024 * Additional Bit field of devices indicating failures to support
2025 * up to 256 devices with the 1.9.0 on-disk metadata format
2026 */
2027 __le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1];
2028
2029 __le32 incompat_features; /* Used to indicate any incompatible features */
2030
2031 /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */
2032} __packed;
2033
2034/*
2035 * Check for reshape constraints on raid set @rs:
2036 *
2037 * - reshape function non-existent
2038 * - degraded set
2039 * - ongoing recovery
2040 * - ongoing reshape
2041 *
2042 * Returns 0 if none or -EPERM if given constraint
2043 * and error message reference in @errmsg
2044 */
2045static int rs_check_reshape(struct raid_set *rs)
2046{
2047 struct mddev *mddev = &rs->md;
2048
2049 if (!mddev->pers || !mddev->pers->check_reshape)
2050 rs->ti->error = "Reshape not supported";
2051 else if (mddev->degraded)
2052 rs->ti->error = "Can't reshape degraded raid set";
2053 else if (rs_is_recovering(rs))
2054 rs->ti->error = "Convert request on recovering raid set prohibited";
2055 else if (rs_is_reshaping(rs))
2056 rs->ti->error = "raid set already reshaping!";
2057 else if (!(rs_is_raid1(rs) || rs_is_raid10(rs) || rs_is_raid456(rs)))
2058 rs->ti->error = "Reshaping only supported for raid1/4/5/6/10";
2059 else
2060 return 0;
2061
2062 return -EPERM;
2063}
2064
2065static int read_disk_sb(struct md_rdev *rdev, int size, bool force_reload)
2066{
2067 BUG_ON(!rdev->sb_page);
2068
2069 if (rdev->sb_loaded && !force_reload)
2070 return 0;
2071
2072 rdev->sb_loaded = 0;
2073
2074 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, true)) {
2075 DMERR("Failed to read superblock of device at position %d",
2076 rdev->raid_disk);
2077 md_error(rdev->mddev, rdev);
2078 set_bit(Faulty, &rdev->flags);
2079 return -EIO;
2080 }
2081
2082 rdev->sb_loaded = 1;
2083
2084 return 0;
2085}
2086
2087static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
2088{
2089 failed_devices[0] = le64_to_cpu(sb->failed_devices);
2090 memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices));
2091
2092 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
2093 int i = ARRAY_SIZE(sb->extended_failed_devices);
2094
2095 while (i--)
2096 failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]);
2097 }
2098}
2099
2100static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
2101{
2102 int i = ARRAY_SIZE(sb->extended_failed_devices);
2103
2104 sb->failed_devices = cpu_to_le64(failed_devices[0]);
2105 while (i--)
2106 sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]);
2107}
2108
2109/*
2110 * Synchronize the superblock members with the raid set properties
2111 *
2112 * All superblock data is little endian.
2113 */
2114static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
2115{
2116 bool update_failed_devices = false;
2117 unsigned int i;
2118 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
2119 struct dm_raid_superblock *sb;
2120 struct raid_set *rs = container_of(mddev, struct raid_set, md);
2121
2122 /* No metadata device, no superblock */
2123 if (!rdev->meta_bdev)
2124 return;
2125
2126 BUG_ON(!rdev->sb_page);
2127
2128 sb = page_address(rdev->sb_page);
2129
2130 sb_retrieve_failed_devices(sb, failed_devices);
2131
2132 for (i = 0; i < rs->raid_disks; i++)
2133 if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) {
2134 update_failed_devices = true;
2135 set_bit(i, (void *) failed_devices);
2136 }
2137
2138 if (update_failed_devices)
2139 sb_update_failed_devices(sb, failed_devices);
2140
2141 sb->magic = cpu_to_le32(DM_RAID_MAGIC);
2142 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
2143
2144 sb->num_devices = cpu_to_le32(mddev->raid_disks);
2145 sb->array_position = cpu_to_le32(rdev->raid_disk);
2146
2147 sb->events = cpu_to_le64(mddev->events);
2148
2149 sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
2150 sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
2151
2152 sb->level = cpu_to_le32(mddev->level);
2153 sb->layout = cpu_to_le32(mddev->layout);
2154 sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
2155
2156 /********************************************************************
2157 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
2158 *
2159 * FEATURE_FLAG_SUPPORTS_V190 in the compat_features member indicates that those exist
2160 */
2161 sb->new_level = cpu_to_le32(mddev->new_level);
2162 sb->new_layout = cpu_to_le32(mddev->new_layout);
2163 sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors);
2164
2165 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2166
2167 smp_rmb(); /* Make sure we access most recent reshape position */
2168 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2169 if (le64_to_cpu(sb->reshape_position) != MaxSector) {
2170 /* Flag ongoing reshape */
2171 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE);
2172
2173 if (mddev->delta_disks < 0 || mddev->reshape_backwards)
2174 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS);
2175 } else {
2176 /* Clear reshape flags */
2177 sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS));
2178 }
2179
2180 sb->array_sectors = cpu_to_le64(mddev->array_sectors);
2181 sb->data_offset = cpu_to_le64(rdev->data_offset);
2182 sb->new_data_offset = cpu_to_le64(rdev->new_data_offset);
2183 sb->sectors = cpu_to_le64(rdev->sectors);
2184 sb->incompat_features = cpu_to_le32(0);
2185
2186 /* Zero out the rest of the payload after the size of the superblock */
2187 memset(sb + 1, 0, rdev->sb_size - sizeof(*sb));
2188}
2189
2190/*
2191 * super_load
2192 *
2193 * This function creates a superblock if one is not found on the device
2194 * and will decide which superblock to use if there's a choice.
2195 *
2196 * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
2197 */
2198static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
2199{
2200 int r;
2201 struct dm_raid_superblock *sb;
2202 struct dm_raid_superblock *refsb;
2203 uint64_t events_sb, events_refsb;
2204
2205 r = read_disk_sb(rdev, rdev->sb_size, false);
2206 if (r)
2207 return r;
2208
2209 sb = page_address(rdev->sb_page);
2210
2211 /*
2212 * Two cases that we want to write new superblocks and rebuild:
2213 * 1) New device (no matching magic number)
2214 * 2) Device specified for rebuild (!In_sync w/ offset == 0)
2215 */
2216 if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
2217 (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
2218 super_sync(rdev->mddev, rdev);
2219
2220 set_bit(FirstUse, &rdev->flags);
2221 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
2222
2223 /* Force writing of superblocks to disk */
2224 set_bit(MD_SB_CHANGE_DEVS, &rdev->mddev->sb_flags);
2225
2226 /* Any superblock is better than none, choose that if given */
2227 return refdev ? 0 : 1;
2228 }
2229
2230 if (!refdev)
2231 return 1;
2232
2233 events_sb = le64_to_cpu(sb->events);
2234
2235 refsb = page_address(refdev->sb_page);
2236 events_refsb = le64_to_cpu(refsb->events);
2237
2238 return (events_sb > events_refsb) ? 1 : 0;
2239}
2240
2241static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
2242{
2243 int role;
2244 struct mddev *mddev = &rs->md;
2245 uint64_t events_sb;
2246 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
2247 struct dm_raid_superblock *sb;
2248 uint32_t new_devs = 0, rebuild_and_new = 0, rebuilds = 0;
2249 struct md_rdev *r;
2250 struct dm_raid_superblock *sb2;
2251
2252 sb = page_address(rdev->sb_page);
2253 events_sb = le64_to_cpu(sb->events);
2254
2255 /*
2256 * Initialise to 1 if this is a new superblock.
2257 */
2258 mddev->events = events_sb ? : 1;
2259
2260 mddev->reshape_position = MaxSector;
2261
2262 mddev->raid_disks = le32_to_cpu(sb->num_devices);
2263 mddev->level = le32_to_cpu(sb->level);
2264 mddev->layout = le32_to_cpu(sb->layout);
2265 mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors);
2266
2267 /*
2268 * Reshaping is supported, e.g. reshape_position is valid
2269 * in superblock and superblock content is authoritative.
2270 */
2271 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
2272 /* Superblock is authoritative wrt given raid set layout! */
2273 mddev->new_level = le32_to_cpu(sb->new_level);
2274 mddev->new_layout = le32_to_cpu(sb->new_layout);
2275 mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors);
2276 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
2277 mddev->array_sectors = le64_to_cpu(sb->array_sectors);
2278
2279 /* raid was reshaping and got interrupted */
2280 if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) {
2281 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
2282 DMERR("Reshape requested but raid set is still reshaping");
2283 return -EINVAL;
2284 }
2285
2286 if (mddev->delta_disks < 0 ||
2287 (!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS)))
2288 mddev->reshape_backwards = 1;
2289 else
2290 mddev->reshape_backwards = 0;
2291
2292 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
2293 rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout);
2294 }
2295
2296 } else {
2297 /*
2298 * No takeover/reshaping, because we don't have the extended v1.9.0 metadata
2299 */
2300 struct raid_type *rt_cur = get_raid_type_by_ll(mddev->level, mddev->layout);
2301 struct raid_type *rt_new = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
2302
2303 if (rs_takeover_requested(rs)) {
2304 if (rt_cur && rt_new)
2305 DMERR("Takeover raid sets from %s to %s not yet supported by metadata. (raid level change)",
2306 rt_cur->name, rt_new->name);
2307 else
2308 DMERR("Takeover raid sets not yet supported by metadata. (raid level change)");
2309 return -EINVAL;
2310 } else if (rs_reshape_requested(rs)) {
2311 DMERR("Reshaping raid sets not yet supported by metadata. (raid layout change keeping level)");
2312 if (mddev->layout != mddev->new_layout) {
2313 if (rt_cur && rt_new)
2314 DMERR(" current layout %s vs new layout %s",
2315 rt_cur->name, rt_new->name);
2316 else
2317 DMERR(" current layout 0x%X vs new layout 0x%X",
2318 le32_to_cpu(sb->layout), mddev->new_layout);
2319 }
2320 if (mddev->chunk_sectors != mddev->new_chunk_sectors)
2321 DMERR(" current stripe sectors %u vs new stripe sectors %u",
2322 mddev->chunk_sectors, mddev->new_chunk_sectors);
2323 if (rs->delta_disks)
2324 DMERR(" current %u disks vs new %u disks",
2325 mddev->raid_disks, mddev->raid_disks + rs->delta_disks);
2326 if (rs_is_raid10(rs)) {
2327 DMERR(" Old layout: %s w/ %u copies",
2328 raid10_md_layout_to_format(mddev->layout),
2329 raid10_md_layout_to_copies(mddev->layout));
2330 DMERR(" New layout: %s w/ %u copies",
2331 raid10_md_layout_to_format(mddev->new_layout),
2332 raid10_md_layout_to_copies(mddev->new_layout));
2333 }
2334 return -EINVAL;
2335 }
2336
2337 DMINFO("Discovered old metadata format; upgrading to extended metadata format");
2338 }
2339
2340 if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
2341 mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
2342
2343 /*
2344 * During load, we set FirstUse if a new superblock was written.
2345 * There are two reasons we might not have a superblock:
2346 * 1) The raid set is brand new - in which case, all of the
2347 * devices must have their In_sync bit set. Also,
2348 * recovery_cp must be 0, unless forced.
2349 * 2) This is a new device being added to an old raid set
2350 * and the new device needs to be rebuilt - in which
2351 * case the In_sync bit will /not/ be set and
2352 * recovery_cp must be MaxSector.
2353 * 3) This is/are a new device(s) being added to an old
2354 * raid set during takeover to a higher raid level
2355 * to provide capacity for redundancy or during reshape
2356 * to add capacity to grow the raid set.
2357 */
2358 rdev_for_each(r, mddev) {
2359 if (test_bit(Journal, &rdev->flags))
2360 continue;
2361
2362 if (test_bit(FirstUse, &r->flags))
2363 new_devs++;
2364
2365 if (!test_bit(In_sync, &r->flags)) {
2366 DMINFO("Device %d specified for rebuild; clearing superblock",
2367 r->raid_disk);
2368 rebuilds++;
2369
2370 if (test_bit(FirstUse, &r->flags))
2371 rebuild_and_new++;
2372 }
2373 }
2374
2375 if (new_devs == rs->raid_disks || !rebuilds) {
2376 /* Replace a broken device */
2377 if (new_devs == rs->raid_disks) {
2378 DMINFO("Superblocks created for new raid set");
2379 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2380 } else if (new_devs != rebuilds &&
2381 new_devs != rs->delta_disks) {
2382 DMERR("New device injected into existing raid set without "
2383 "'delta_disks' or 'rebuild' parameter specified");
2384 return -EINVAL;
2385 }
2386 } else if (new_devs && new_devs != rebuilds) {
2387 DMERR("%u 'rebuild' devices cannot be injected into"
2388 " a raid set with %u other first-time devices",
2389 rebuilds, new_devs);
2390 return -EINVAL;
2391 } else if (rebuilds) {
2392 if (rebuild_and_new && rebuilds != rebuild_and_new) {
2393 DMERR("new device%s provided without 'rebuild'",
2394 new_devs > 1 ? "s" : "");
2395 return -EINVAL;
2396 } else if (!test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) && rs_is_recovering(rs)) {
2397 DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)",
2398 (unsigned long long) mddev->recovery_cp);
2399 return -EINVAL;
2400 } else if (rs_is_reshaping(rs)) {
2401 DMERR("'rebuild' specified while raid set is being reshaped (reshape_position=%llu)",
2402 (unsigned long long) mddev->reshape_position);
2403 return -EINVAL;
2404 }
2405 }
2406
2407 /*
2408 * Now we set the Faulty bit for those devices that are
2409 * recorded in the superblock as failed.
2410 */
2411 sb_retrieve_failed_devices(sb, failed_devices);
2412 rdev_for_each(r, mddev) {
2413 if (test_bit(Journal, &rdev->flags) ||
2414 !r->sb_page)
2415 continue;
2416 sb2 = page_address(r->sb_page);
2417 sb2->failed_devices = 0;
2418 memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices));
2419
2420 /*
2421 * Check for any device re-ordering.
2422 */
2423 if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
2424 role = le32_to_cpu(sb2->array_position);
2425 if (role < 0)
2426 continue;
2427
2428 if (role != r->raid_disk) {
2429 if (rs_is_raid10(rs) && __is_raid10_near(mddev->layout)) {
2430 if (mddev->raid_disks % __raid10_near_copies(mddev->layout) ||
2431 rs->raid_disks % rs->raid10_copies) {
2432 rs->ti->error =
2433 "Cannot change raid10 near set to odd # of devices!";
2434 return -EINVAL;
2435 }
2436
2437 sb2->array_position = cpu_to_le32(r->raid_disk);
2438
2439 } else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) &&
2440 !(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) &&
2441 !rt_is_raid1(rs->raid_type)) {
2442 rs->ti->error = "Cannot change device positions in raid set";
2443 return -EINVAL;
2444 }
2445
2446 DMINFO("raid device #%d now at position #%d", role, r->raid_disk);
2447 }
2448
2449 /*
2450 * Partial recovery is performed on
2451 * returning failed devices.
2452 */
2453 if (test_bit(role, (void *) failed_devices))
2454 set_bit(Faulty, &r->flags);
2455 }
2456 }
2457
2458 return 0;
2459}
2460
2461static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
2462{
2463 struct mddev *mddev = &rs->md;
2464 struct dm_raid_superblock *sb;
2465
2466 if (rs_is_raid0(rs) || !rdev->sb_page || rdev->raid_disk < 0)
2467 return 0;
2468
2469 sb = page_address(rdev->sb_page);
2470
2471 /*
2472 * If mddev->events is not set, we know we have not yet initialized
2473 * the array.
2474 */
2475 if (!mddev->events && super_init_validation(rs, rdev))
2476 return -EINVAL;
2477
2478 if (le32_to_cpu(sb->compat_features) &&
2479 le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
2480 rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
2481 return -EINVAL;
2482 }
2483
2484 if (sb->incompat_features) {
2485 rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet";
2486 return -EINVAL;
2487 }
2488
2489 /* Enable bitmap creation on @rs unless no metadevs or raid0 or journaled raid4/5/6 set. */
2490 mddev->bitmap_info.offset = (rt_is_raid0(rs->raid_type) || rs->journal_dev.dev) ? 0 : to_sector(4096);
2491 mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
2492
2493 if (!test_and_clear_bit(FirstUse, &rdev->flags)) {
2494 /*
2495 * Retrieve rdev size stored in superblock to be prepared for shrink.
2496 * Check extended superblock members are present otherwise the size
2497 * will not be set!
2498 */
2499 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190)
2500 rdev->sectors = le64_to_cpu(sb->sectors);
2501
2502 rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
2503 if (rdev->recovery_offset == MaxSector)
2504 set_bit(In_sync, &rdev->flags);
2505 /*
2506 * If no reshape in progress -> we're recovering single
2507 * disk(s) and have to set the device(s) to out-of-sync
2508 */
2509 else if (!rs_is_reshaping(rs))
2510 clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */
2511 }
2512
2513 /*
2514 * If a device comes back, set it as not In_sync and no longer faulty.
2515 */
2516 if (test_and_clear_bit(Faulty, &rdev->flags)) {
2517 rdev->recovery_offset = 0;
2518 clear_bit(In_sync, &rdev->flags);
2519 rdev->saved_raid_disk = rdev->raid_disk;
2520 }
2521
2522 /* Reshape support -> restore respective data offsets */
2523 rdev->data_offset = le64_to_cpu(sb->data_offset);
2524 rdev->new_data_offset = le64_to_cpu(sb->new_data_offset);
2525
2526 return 0;
2527}
2528
2529/*
2530 * Analyse superblocks and select the freshest.
2531 */
2532static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
2533{
2534 int r;
2535 struct md_rdev *rdev, *freshest;
2536 struct mddev *mddev = &rs->md;
2537
2538 freshest = NULL;
2539 rdev_for_each(rdev, mddev) {
2540 if (test_bit(Journal, &rdev->flags))
2541 continue;
2542
2543 if (!rdev->meta_bdev)
2544 continue;
2545
2546 /* Set superblock offset/size for metadata device. */
2547 rdev->sb_start = 0;
2548 rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
2549 if (rdev->sb_size < sizeof(struct dm_raid_superblock) || rdev->sb_size > PAGE_SIZE) {
2550 DMERR("superblock size of a logical block is no longer valid");
2551 return -EINVAL;
2552 }
2553
2554 /*
2555 * Skipping super_load due to CTR_FLAG_SYNC will cause
2556 * the array to undergo initialization again as
2557 * though it were new. This is the intended effect
2558 * of the "sync" directive.
2559 *
2560 * With reshaping capability added, we must ensure that
2561 * the "sync" directive is disallowed during the reshape.
2562 */
2563 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
2564 continue;
2565
2566 r = super_load(rdev, freshest);
2567
2568 switch (r) {
2569 case 1:
2570 freshest = rdev;
2571 break;
2572 case 0:
2573 break;
2574 default:
2575 /* This is a failure to read the superblock from the metadata device. */
2576 /*
2577 * We have to keep any raid0 data/metadata device pairs or
2578 * the MD raid0 personality will fail to start the array.
2579 */
2580 if (rs_is_raid0(rs))
2581 continue;
2582
2583 /*
2584 * We keep the dm_devs to be able to emit the device tuple
2585 * properly on the table line in raid_status() (rather than
2586 * mistakenly acting as if '- -' got passed into the constructor).
2587 *
2588 * The rdev has to stay on the same_set list to allow for
2589 * the attempt to restore faulty devices on second resume.
2590 */
2591 rdev->raid_disk = rdev->saved_raid_disk = -1;
2592 break;
2593 }
2594 }
2595
2596 if (!freshest)
2597 return 0;
2598
2599 /*
2600 * Validation of the freshest device provides the source of
2601 * validation for the remaining devices.
2602 */
2603 rs->ti->error = "Unable to assemble array: Invalid superblocks";
2604 if (super_validate(rs, freshest))
2605 return -EINVAL;
2606
2607 if (validate_raid_redundancy(rs)) {
2608 rs->ti->error = "Insufficient redundancy to activate array";
2609 return -EINVAL;
2610 }
2611
2612 rdev_for_each(rdev, mddev)
2613 if (!test_bit(Journal, &rdev->flags) &&
2614 rdev != freshest &&
2615 super_validate(rs, rdev))
2616 return -EINVAL;
2617 return 0;
2618}
2619
2620/*
2621 * Adjust data_offset and new_data_offset on all disk members of @rs
2622 * for out of place reshaping if requested by constructor
2623 *
2624 * We need free space at the beginning of each raid disk for forward
2625 * and at the end for backward reshapes which userspace has to provide
2626 * via remapping/reordering of space.
2627 */
2628static int rs_adjust_data_offsets(struct raid_set *rs)
2629{
2630 sector_t data_offset = 0, new_data_offset = 0;
2631 struct md_rdev *rdev;
2632
2633 /* Constructor did not request data offset change */
2634 if (!test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
2635 if (!rs_is_reshapable(rs))
2636 goto out;
2637
2638 return 0;
2639 }
2640
2641 /* HM FIXME: get In_Sync raid_dev? */
2642 rdev = &rs->dev[0].rdev;
2643
2644 if (rs->delta_disks < 0) {
2645 /*
2646 * Removing disks (reshaping backwards):
2647 *
2648 * - before reshape: data is at offset 0 and free space
2649 * is at end of each component LV
2650 *
2651 * - after reshape: data is at offset rs->data_offset != 0 on each component LV
2652 */
2653 data_offset = 0;
2654 new_data_offset = rs->data_offset;
2655
2656 } else if (rs->delta_disks > 0) {
2657 /*
2658 * Adding disks (reshaping forwards):
2659 *
2660 * - before reshape: data is at offset rs->data_offset != 0 and
2661 * free space is at begin of each component LV
2662 *
2663 * - after reshape: data is at offset 0 on each component LV
2664 */
2665 data_offset = rs->data_offset;
2666 new_data_offset = 0;
2667
2668 } else {
2669 /*
2670 * User space passes in 0 for data offset after having removed reshape space
2671 *
2672 * - or - (data offset != 0)
2673 *
2674 * Changing RAID layout or chunk size -> toggle offsets
2675 *
2676 * - before reshape: data is at offset rs->data_offset 0 and
2677 * free space is at end of each component LV
2678 * -or-
2679 * data is at offset rs->data_offset != 0 and
2680 * free space is at begin of each component LV
2681 *
2682 * - after reshape: data is at offset 0 if it was at offset != 0
2683 * or at offset != 0 if it was at offset 0
2684 * on each component LV
2685 *
2686 */
2687 data_offset = rs->data_offset ? rdev->data_offset : 0;
2688 new_data_offset = data_offset ? 0 : rs->data_offset;
2689 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2690 }
2691
2692 /*
2693 * Make sure we got a minimum amount of free sectors per device
2694 */
2695 if (rs->data_offset &&
2696 bdev_nr_sectors(rdev->bdev) - rs->md.dev_sectors < MIN_FREE_RESHAPE_SPACE) {
2697 rs->ti->error = data_offset ? "No space for forward reshape" :
2698 "No space for backward reshape";
2699 return -ENOSPC;
2700 }
2701out:
2702 /*
2703 * Raise recovery_cp in case data_offset != 0 to
2704 * avoid false recovery positives in the constructor.
2705 */
2706 if (rs->md.recovery_cp < rs->md.dev_sectors)
2707 rs->md.recovery_cp += rs->dev[0].rdev.data_offset;
2708
2709 /* Adjust data offsets on all rdevs but on any raid4/5/6 journal device */
2710 rdev_for_each(rdev, &rs->md) {
2711 if (!test_bit(Journal, &rdev->flags)) {
2712 rdev->data_offset = data_offset;
2713 rdev->new_data_offset = new_data_offset;
2714 }
2715 }
2716
2717 return 0;
2718}
2719
2720/* Userpace reordered disks -> adjust raid_disk indexes in @rs */
2721static void __reorder_raid_disk_indexes(struct raid_set *rs)
2722{
2723 int i = 0;
2724 struct md_rdev *rdev;
2725
2726 rdev_for_each(rdev, &rs->md) {
2727 if (!test_bit(Journal, &rdev->flags)) {
2728 rdev->raid_disk = i++;
2729 rdev->saved_raid_disk = rdev->new_raid_disk = -1;
2730 }
2731 }
2732}
2733
2734/*
2735 * Setup @rs for takeover by a different raid level
2736 */
2737static int rs_setup_takeover(struct raid_set *rs)
2738{
2739 struct mddev *mddev = &rs->md;
2740 struct md_rdev *rdev;
2741 unsigned int d = mddev->raid_disks = rs->raid_disks;
2742 sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset;
2743
2744 if (rt_is_raid10(rs->raid_type)) {
2745 if (rs_is_raid0(rs)) {
2746 /* Userpace reordered disks -> adjust raid_disk indexes */
2747 __reorder_raid_disk_indexes(rs);
2748
2749 /* raid0 -> raid10_far layout */
2750 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR,
2751 rs->raid10_copies);
2752 } else if (rs_is_raid1(rs))
2753 /* raid1 -> raid10_near layout */
2754 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2755 rs->raid_disks);
2756 else
2757 return -EINVAL;
2758
2759 }
2760
2761 clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2762 mddev->recovery_cp = MaxSector;
2763
2764 while (d--) {
2765 rdev = &rs->dev[d].rdev;
2766
2767 if (test_bit(d, (void *) rs->rebuild_disks)) {
2768 clear_bit(In_sync, &rdev->flags);
2769 clear_bit(Faulty, &rdev->flags);
2770 mddev->recovery_cp = rdev->recovery_offset = 0;
2771 /* Bitmap has to be created when we do an "up" takeover */
2772 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2773 }
2774
2775 rdev->new_data_offset = new_data_offset;
2776 }
2777
2778 return 0;
2779}
2780
2781/* Prepare @rs for reshape */
2782static int rs_prepare_reshape(struct raid_set *rs)
2783{
2784 bool reshape;
2785 struct mddev *mddev = &rs->md;
2786
2787 if (rs_is_raid10(rs)) {
2788 if (rs->raid_disks != mddev->raid_disks &&
2789 __is_raid10_near(mddev->layout) &&
2790 rs->raid10_copies &&
2791 rs->raid10_copies != __raid10_near_copies(mddev->layout)) {
2792 /*
2793 * raid disk have to be multiple of data copies to allow this conversion,
2794 *
2795 * This is actually not a reshape it is a
2796 * rebuild of any additional mirrors per group
2797 */
2798 if (rs->raid_disks % rs->raid10_copies) {
2799 rs->ti->error = "Can't reshape raid10 mirror groups";
2800 return -EINVAL;
2801 }
2802
2803 /* Userpace reordered disks to add/remove mirrors -> adjust raid_disk indexes */
2804 __reorder_raid_disk_indexes(rs);
2805 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2806 rs->raid10_copies);
2807 mddev->new_layout = mddev->layout;
2808 reshape = false;
2809 } else
2810 reshape = true;
2811
2812 } else if (rs_is_raid456(rs))
2813 reshape = true;
2814
2815 else if (rs_is_raid1(rs)) {
2816 if (rs->delta_disks) {
2817 /* Process raid1 via delta_disks */
2818 mddev->degraded = rs->delta_disks < 0 ? -rs->delta_disks : rs->delta_disks;
2819 reshape = true;
2820 } else {
2821 /* Process raid1 without delta_disks */
2822 mddev->raid_disks = rs->raid_disks;
2823 reshape = false;
2824 }
2825 } else {
2826 rs->ti->error = "Called with bogus raid type";
2827 return -EINVAL;
2828 }
2829
2830 if (reshape) {
2831 set_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags);
2832 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2833 } else if (mddev->raid_disks < rs->raid_disks)
2834 /* Create new superblocks and bitmaps, if any new disks */
2835 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2836
2837 return 0;
2838}
2839
2840/*
2841 * Reshape:
2842 * - change raid layout
2843 * - change chunk size
2844 * - add disks
2845 * - remove disks
2846 */
2847static int rs_setup_reshape(struct raid_set *rs)
2848{
2849 int r = 0;
2850 unsigned int cur_raid_devs, d;
2851 sector_t reshape_sectors = _get_reshape_sectors(rs);
2852 struct mddev *mddev = &rs->md;
2853 struct md_rdev *rdev;
2854
2855 mddev->delta_disks = rs->delta_disks;
2856 cur_raid_devs = mddev->raid_disks;
2857
2858 /* Ignore impossible layout change whilst adding/removing disks */
2859 if (mddev->delta_disks &&
2860 mddev->layout != mddev->new_layout) {
2861 DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks);
2862 mddev->new_layout = mddev->layout;
2863 }
2864
2865 /*
2866 * Adjust array size:
2867 *
2868 * - in case of adding disk(s), array size has
2869 * to grow after the disk adding reshape,
2870 * which'll happen in the event handler;
2871 * reshape will happen forward, so space has to
2872 * be available at the beginning of each disk
2873 *
2874 * - in case of removing disk(s), array size
2875 * has to shrink before starting the reshape,
2876 * which'll happen here;
2877 * reshape will happen backward, so space has to
2878 * be available at the end of each disk
2879 *
2880 * - data_offset and new_data_offset are
2881 * adjusted for aforementioned out of place
2882 * reshaping based on userspace passing in
2883 * the "data_offset <sectors>" key/value
2884 * pair via the constructor
2885 */
2886
2887 /* Add disk(s) */
2888 if (rs->delta_disks > 0) {
2889 /* Prepare disks for check in raid4/5/6/10 {check|start}_reshape */
2890 for (d = cur_raid_devs; d < rs->raid_disks; d++) {
2891 rdev = &rs->dev[d].rdev;
2892 clear_bit(In_sync, &rdev->flags);
2893
2894 /*
2895 * save_raid_disk needs to be -1, or recovery_offset will be set to 0
2896 * by md, which'll store that erroneously in the superblock on reshape
2897 */
2898 rdev->saved_raid_disk = -1;
2899 rdev->raid_disk = d;
2900
2901 rdev->sectors = mddev->dev_sectors;
2902 rdev->recovery_offset = rs_is_raid1(rs) ? 0 : MaxSector;
2903 }
2904
2905 mddev->reshape_backwards = 0; /* adding disk(s) -> forward reshape */
2906
2907 /* Remove disk(s) */
2908 } else if (rs->delta_disks < 0) {
2909 r = rs_set_dev_and_array_sectors(rs, rs->ti->len, true);
2910 mddev->reshape_backwards = 1; /* removing disk(s) -> backward reshape */
2911
2912 /* Change layout and/or chunk size */
2913 } else {
2914 /*
2915 * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size:
2916 *
2917 * keeping number of disks and do layout change ->
2918 *
2919 * toggle reshape_backward depending on data_offset:
2920 *
2921 * - free space upfront -> reshape forward
2922 *
2923 * - free space at the end -> reshape backward
2924 *
2925 *
2926 * This utilizes free reshape space avoiding the need
2927 * for userspace to move (parts of) LV segments in
2928 * case of layout/chunksize change (for disk
2929 * adding/removing reshape space has to be at
2930 * the proper address (see above with delta_disks):
2931 *
2932 * add disk(s) -> begin
2933 * remove disk(s)-> end
2934 */
2935 mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1;
2936 }
2937
2938 /*
2939 * Adjust device size for forward reshape
2940 * because md_finish_reshape() reduces it.
2941 */
2942 if (!mddev->reshape_backwards)
2943 rdev_for_each(rdev, &rs->md)
2944 if (!test_bit(Journal, &rdev->flags))
2945 rdev->sectors += reshape_sectors;
2946
2947 return r;
2948}
2949
2950/*
2951 * If the md resync thread has updated superblock with max reshape position
2952 * at the end of a reshape but not (yet) reset the layout configuration
2953 * changes -> reset the latter.
2954 */
2955static void rs_reset_inconclusive_reshape(struct raid_set *rs)
2956{
2957 if (!rs_is_reshaping(rs) && rs_is_layout_change(rs, true)) {
2958 rs_set_cur(rs);
2959 rs->md.delta_disks = 0;
2960 rs->md.reshape_backwards = 0;
2961 }
2962}
2963
2964/*
2965 * Enable/disable discard support on RAID set depending on
2966 * RAID level and discard properties of underlying RAID members.
2967 */
2968static void configure_discard_support(struct raid_set *rs)
2969{
2970 int i;
2971 bool raid456;
2972 struct dm_target *ti = rs->ti;
2973
2974 /*
2975 * XXX: RAID level 4,5,6 require zeroing for safety.
2976 */
2977 raid456 = rs_is_raid456(rs);
2978
2979 for (i = 0; i < rs->raid_disks; i++) {
2980 if (!rs->dev[i].rdev.bdev ||
2981 !bdev_max_discard_sectors(rs->dev[i].rdev.bdev))
2982 return;
2983
2984 if (raid456) {
2985 if (!devices_handle_discard_safely) {
2986 DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
2987 DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");
2988 return;
2989 }
2990 }
2991 }
2992
2993 ti->num_discard_bios = 1;
2994}
2995
2996/*
2997 * Construct a RAID0/1/10/4/5/6 mapping:
2998 * Args:
2999 * <raid_type> <#raid_params> <raid_params>{0,} \
3000 * <#raid_devs> [<meta_dev1> <dev1>]{1,}
3001 *
3002 * <raid_params> varies by <raid_type>. See 'parse_raid_params' for
3003 * details on possible <raid_params>.
3004 *
3005 * Userspace is free to initialize the metadata devices, hence the superblocks to
3006 * enforce recreation based on the passed in table parameters.
3007 *
3008 */
3009static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
3010{
3011 int r;
3012 bool resize = false;
3013 struct raid_type *rt;
3014 unsigned int num_raid_params, num_raid_devs;
3015 sector_t sb_array_sectors, rdev_sectors, reshape_sectors;
3016 struct raid_set *rs = NULL;
3017 const char *arg;
3018 struct rs_layout rs_layout;
3019 struct dm_arg_set as = { argc, argv }, as_nrd;
3020 struct dm_arg _args[] = {
3021 { 0, as.argc, "Cannot understand number of raid parameters" },
3022 { 1, 254, "Cannot understand number of raid devices parameters" }
3023 };
3024
3025 arg = dm_shift_arg(&as);
3026 if (!arg) {
3027 ti->error = "No arguments";
3028 return -EINVAL;
3029 }
3030
3031 rt = get_raid_type(arg);
3032 if (!rt) {
3033 ti->error = "Unrecognised raid_type";
3034 return -EINVAL;
3035 }
3036
3037 /* Must have <#raid_params> */
3038 if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error))
3039 return -EINVAL;
3040
3041 /* number of raid device tupples <meta_dev data_dev> */
3042 as_nrd = as;
3043 dm_consume_args(&as_nrd, num_raid_params);
3044 _args[1].max = (as_nrd.argc - 1) / 2;
3045 if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error))
3046 return -EINVAL;
3047
3048 if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) {
3049 ti->error = "Invalid number of supplied raid devices";
3050 return -EINVAL;
3051 }
3052
3053 rs = raid_set_alloc(ti, rt, num_raid_devs);
3054 if (IS_ERR(rs))
3055 return PTR_ERR(rs);
3056
3057 r = parse_raid_params(rs, &as, num_raid_params);
3058 if (r)
3059 goto bad;
3060
3061 r = parse_dev_params(rs, &as);
3062 if (r)
3063 goto bad;
3064
3065 rs->md.sync_super = super_sync;
3066
3067 /*
3068 * Calculate ctr requested array and device sizes to allow
3069 * for superblock analysis needing device sizes defined.
3070 *
3071 * Any existing superblock will overwrite the array and device sizes
3072 */
3073 r = rs_set_dev_and_array_sectors(rs, rs->ti->len, false);
3074 if (r)
3075 goto bad;
3076
3077 /* Memorize just calculated, potentially larger sizes to grow the raid set in preresume */
3078 rs->array_sectors = rs->md.array_sectors;
3079 rs->dev_sectors = rs->md.dev_sectors;
3080
3081 /*
3082 * Backup any new raid set level, layout, ...
3083 * requested to be able to compare to superblock
3084 * members for conversion decisions.
3085 */
3086 rs_config_backup(rs, &rs_layout);
3087
3088 r = analyse_superblocks(ti, rs);
3089 if (r)
3090 goto bad;
3091
3092 /* All in-core metadata now as of current superblocks after calling analyse_superblocks() */
3093 sb_array_sectors = rs->md.array_sectors;
3094 rdev_sectors = __rdev_sectors(rs);
3095 if (!rdev_sectors) {
3096 ti->error = "Invalid rdev size";
3097 r = -EINVAL;
3098 goto bad;
3099 }
3100
3101
3102 reshape_sectors = _get_reshape_sectors(rs);
3103 if (rs->dev_sectors != rdev_sectors) {
3104 resize = (rs->dev_sectors != rdev_sectors - reshape_sectors);
3105 if (rs->dev_sectors > rdev_sectors - reshape_sectors)
3106 set_bit(RT_FLAG_RS_GROW, &rs->runtime_flags);
3107 }
3108
3109 INIT_WORK(&rs->md.event_work, do_table_event);
3110 ti->private = rs;
3111 ti->num_flush_bios = 1;
3112 ti->needs_bio_set_dev = true;
3113
3114 /* Restore any requested new layout for conversion decision */
3115 rs_config_restore(rs, &rs_layout);
3116
3117 /*
3118 * Now that we have any superblock metadata available,
3119 * check for new, recovering, reshaping, to be taken over,
3120 * to be reshaped or an existing, unchanged raid set to
3121 * run in sequence.
3122 */
3123 if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) {
3124 /* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */
3125 if (rs_is_raid6(rs) &&
3126 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
3127 ti->error = "'nosync' not allowed for new raid6 set";
3128 r = -EINVAL;
3129 goto bad;
3130 }
3131 rs_setup_recovery(rs, 0);
3132 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3133 rs_set_new(rs);
3134 } else if (rs_is_recovering(rs)) {
3135 /* A recovering raid set may be resized */
3136 goto size_check;
3137 } else if (rs_is_reshaping(rs)) {
3138 /* Have to reject size change request during reshape */
3139 if (resize) {
3140 ti->error = "Can't resize a reshaping raid set";
3141 r = -EPERM;
3142 goto bad;
3143 }
3144 /* skip setup rs */
3145 } else if (rs_takeover_requested(rs)) {
3146 if (rs_is_reshaping(rs)) {
3147 ti->error = "Can't takeover a reshaping raid set";
3148 r = -EPERM;
3149 goto bad;
3150 }
3151
3152 /* We can't takeover a journaled raid4/5/6 */
3153 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
3154 ti->error = "Can't takeover a journaled raid4/5/6 set";
3155 r = -EPERM;
3156 goto bad;
3157 }
3158
3159 /*
3160 * If a takeover is needed, userspace sets any additional
3161 * devices to rebuild and we can check for a valid request here.
3162 *
3163 * If acceptable, set the level to the new requested
3164 * one, prohibit requesting recovery, allow the raid
3165 * set to run and store superblocks during resume.
3166 */
3167 r = rs_check_takeover(rs);
3168 if (r)
3169 goto bad;
3170
3171 r = rs_setup_takeover(rs);
3172 if (r)
3173 goto bad;
3174
3175 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3176 /* Takeover ain't recovery, so disable recovery */
3177 rs_setup_recovery(rs, MaxSector);
3178 rs_set_new(rs);
3179 } else if (rs_reshape_requested(rs)) {
3180 /* Only request grow on raid set size extensions, not on reshapes. */
3181 clear_bit(RT_FLAG_RS_GROW, &rs->runtime_flags);
3182
3183 /*
3184 * No need to check for 'ongoing' takeover here, because takeover
3185 * is an instant operation as oposed to an ongoing reshape.
3186 */
3187
3188 /* We can't reshape a journaled raid4/5/6 */
3189 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
3190 ti->error = "Can't reshape a journaled raid4/5/6 set";
3191 r = -EPERM;
3192 goto bad;
3193 }
3194
3195 /* Out-of-place space has to be available to allow for a reshape unless raid1! */
3196 if (reshape_sectors || rs_is_raid1(rs)) {
3197 /*
3198 * We can only prepare for a reshape here, because the
3199 * raid set needs to run to provide the repective reshape
3200 * check functions via its MD personality instance.
3201 *
3202 * So do the reshape check after md_run() succeeded.
3203 */
3204 r = rs_prepare_reshape(rs);
3205 if (r)
3206 goto bad;
3207
3208 /* Reshaping ain't recovery, so disable recovery */
3209 rs_setup_recovery(rs, MaxSector);
3210 }
3211 rs_set_cur(rs);
3212 } else {
3213size_check:
3214 /* May not set recovery when a device rebuild is requested */
3215 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) {
3216 clear_bit(RT_FLAG_RS_GROW, &rs->runtime_flags);
3217 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3218 rs_setup_recovery(rs, MaxSector);
3219 } else if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags)) {
3220 /*
3221 * Set raid set to current size, i.e. size as of
3222 * superblocks to grow to larger size in preresume.
3223 */
3224 r = rs_set_dev_and_array_sectors(rs, sb_array_sectors, false);
3225 if (r)
3226 goto bad;
3227
3228 rs_setup_recovery(rs, rs->md.recovery_cp < rs->md.dev_sectors ? rs->md.recovery_cp : rs->md.dev_sectors);
3229 } else {
3230 /* This is no size change or it is shrinking, update size and record in superblocks */
3231 r = rs_set_dev_and_array_sectors(rs, rs->ti->len, false);
3232 if (r)
3233 goto bad;
3234
3235 if (sb_array_sectors > rs->array_sectors)
3236 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3237 }
3238 rs_set_cur(rs);
3239 }
3240
3241 /* If constructor requested it, change data and new_data offsets */
3242 r = rs_adjust_data_offsets(rs);
3243 if (r)
3244 goto bad;
3245
3246 /* Catch any inconclusive reshape superblock content. */
3247 rs_reset_inconclusive_reshape(rs);
3248
3249 /* Start raid set read-only and assumed clean to change in raid_resume() */
3250 rs->md.ro = 1;
3251 rs->md.in_sync = 1;
3252
3253 /* Has to be held on running the array */
3254 mddev_suspend_and_lock_nointr(&rs->md);
3255
3256 /* Keep array frozen until resume. */
3257 md_frozen_sync_thread(&rs->md);
3258
3259 r = md_run(&rs->md);
3260 rs->md.in_sync = 0; /* Assume already marked dirty */
3261 if (r) {
3262 ti->error = "Failed to run raid array";
3263 mddev_unlock(&rs->md);
3264 goto bad;
3265 }
3266
3267 r = md_start(&rs->md);
3268 if (r) {
3269 ti->error = "Failed to start raid array";
3270 goto bad_unlock;
3271 }
3272
3273 /* If raid4/5/6 journal mode explicitly requested (only possible with journal dev) -> set it */
3274 if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
3275 r = r5c_journal_mode_set(&rs->md, rs->journal_dev.mode);
3276 if (r) {
3277 ti->error = "Failed to set raid4/5/6 journal mode";
3278 goto bad_unlock;
3279 }
3280 }
3281
3282 set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags);
3283
3284 /* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
3285 if (rs_is_raid456(rs)) {
3286 r = rs_set_raid456_stripe_cache(rs);
3287 if (r)
3288 goto bad_unlock;
3289 }
3290
3291 /* Now do an early reshape check */
3292 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
3293 r = rs_check_reshape(rs);
3294 if (r)
3295 goto bad_unlock;
3296
3297 /* Restore new, ctr requested layout to perform check */
3298 rs_config_restore(rs, &rs_layout);
3299
3300 if (rs->md.pers->start_reshape) {
3301 r = rs->md.pers->check_reshape(&rs->md);
3302 if (r) {
3303 ti->error = "Reshape check failed";
3304 goto bad_unlock;
3305 }
3306 }
3307 }
3308
3309 /* Disable/enable discard support on raid set. */
3310 configure_discard_support(rs);
3311
3312 mddev_unlock(&rs->md);
3313 return 0;
3314
3315bad_unlock:
3316 md_stop(&rs->md);
3317 mddev_unlock(&rs->md);
3318bad:
3319 raid_set_free(rs);
3320
3321 return r;
3322}
3323
3324static void raid_dtr(struct dm_target *ti)
3325{
3326 struct raid_set *rs = ti->private;
3327
3328 mddev_lock_nointr(&rs->md);
3329 md_stop(&rs->md);
3330 mddev_unlock(&rs->md);
3331
3332 if (work_pending(&rs->md.event_work))
3333 flush_work(&rs->md.event_work);
3334 raid_set_free(rs);
3335}
3336
3337static int raid_map(struct dm_target *ti, struct bio *bio)
3338{
3339 struct raid_set *rs = ti->private;
3340 struct mddev *mddev = &rs->md;
3341
3342 /*
3343 * If we're reshaping to add disk(s), ti->len and
3344 * mddev->array_sectors will differ during the process
3345 * (ti->len > mddev->array_sectors), so we have to requeue
3346 * bios with addresses > mddev->array_sectors here or
3347 * there will occur accesses past EOD of the component
3348 * data images thus erroring the raid set.
3349 */
3350 if (unlikely(bio_has_data(bio) && bio_end_sector(bio) > mddev->array_sectors))
3351 return DM_MAPIO_REQUEUE;
3352
3353 if (unlikely(!md_handle_request(mddev, bio)))
3354 return DM_MAPIO_REQUEUE;
3355
3356 return DM_MAPIO_SUBMITTED;
3357}
3358
3359/* Return sync state string for @state */
3360enum sync_state { st_frozen, st_reshape, st_resync, st_check, st_repair, st_recover, st_idle };
3361static const char *sync_str(enum sync_state state)
3362{
3363 /* Has to be in above sync_state order! */
3364 static const char *sync_strs[] = {
3365 "frozen",
3366 "reshape",
3367 "resync",
3368 "check",
3369 "repair",
3370 "recover",
3371 "idle"
3372 };
3373
3374 return __within_range(state, 0, ARRAY_SIZE(sync_strs) - 1) ? sync_strs[state] : "undef";
3375};
3376
3377/* Return enum sync_state for @mddev derived from @recovery flags */
3378static enum sync_state decipher_sync_action(struct mddev *mddev, unsigned long recovery)
3379{
3380 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
3381 return st_frozen;
3382
3383 /* The MD sync thread can be done with io or be interrupted but still be running */
3384 if (!test_bit(MD_RECOVERY_DONE, &recovery) &&
3385 (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
3386 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery)))) {
3387 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
3388 return st_reshape;
3389
3390 if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
3391 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
3392 return st_resync;
3393 if (test_bit(MD_RECOVERY_CHECK, &recovery))
3394 return st_check;
3395 return st_repair;
3396 }
3397
3398 if (test_bit(MD_RECOVERY_RECOVER, &recovery))
3399 return st_recover;
3400
3401 if (mddev->reshape_position != MaxSector)
3402 return st_reshape;
3403 }
3404
3405 return st_idle;
3406}
3407
3408/*
3409 * Return status string for @rdev
3410 *
3411 * Status characters:
3412 *
3413 * 'D' = Dead/Failed raid set component or raid4/5/6 journal device
3414 * 'a' = Alive but not in-sync raid set component _or_ alive raid4/5/6 'write_back' journal device
3415 * 'A' = Alive and in-sync raid set component _or_ alive raid4/5/6 'write_through' journal device
3416 * '-' = Non-existing device (i.e. uspace passed '- -' into the ctr)
3417 */
3418static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev)
3419{
3420 if (!rdev->bdev)
3421 return "-";
3422 else if (test_bit(Faulty, &rdev->flags))
3423 return "D";
3424 else if (test_bit(Journal, &rdev->flags))
3425 return (rs->journal_dev.mode == R5C_JOURNAL_MODE_WRITE_THROUGH) ? "A" : "a";
3426 else if (test_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags) ||
3427 (!test_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags) &&
3428 !test_bit(In_sync, &rdev->flags)))
3429 return "a";
3430 else
3431 return "A";
3432}
3433
3434/* Helper to return resync/reshape progress for @rs and runtime flags for raid set in sync / resynching */
3435static sector_t rs_get_progress(struct raid_set *rs, unsigned long recovery,
3436 enum sync_state state, sector_t resync_max_sectors)
3437{
3438 sector_t r;
3439 struct mddev *mddev = &rs->md;
3440
3441 clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3442 clear_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
3443
3444 if (rs_is_raid0(rs)) {
3445 r = resync_max_sectors;
3446 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3447
3448 } else {
3449 if (state == st_idle && !test_bit(MD_RECOVERY_INTR, &recovery))
3450 r = mddev->recovery_cp;
3451 else
3452 r = mddev->curr_resync_completed;
3453
3454 if (state == st_idle && r >= resync_max_sectors) {
3455 /*
3456 * Sync complete.
3457 */
3458 /* In case we have finished recovering, the array is in sync. */
3459 if (test_bit(MD_RECOVERY_RECOVER, &recovery))
3460 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3461
3462 } else if (state == st_recover)
3463 /*
3464 * In case we are recovering, the array is not in sync
3465 * and health chars should show the recovering legs.
3466 *
3467 * Already retrieved recovery offset from curr_resync_completed above.
3468 */
3469 ;
3470
3471 else if (state == st_resync || state == st_reshape)
3472 /*
3473 * If "resync/reshape" is occurring, the raid set
3474 * is or may be out of sync hence the health
3475 * characters shall be 'a'.
3476 */
3477 set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
3478
3479 else if (state == st_check || state == st_repair)
3480 /*
3481 * If "check" or "repair" is occurring, the raid set has
3482 * undergone an initial sync and the health characters
3483 * should not be 'a' anymore.
3484 */
3485 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3486
3487 else if (test_bit(MD_RECOVERY_NEEDED, &recovery))
3488 /*
3489 * We are idle and recovery is needed, prevent 'A' chars race
3490 * caused by components still set to in-sync by constructor.
3491 */
3492 set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
3493
3494 else {
3495 /*
3496 * We are idle and the raid set may be doing an initial
3497 * sync, or it may be rebuilding individual components.
3498 * If all the devices are In_sync, then it is the raid set
3499 * that is being initialized.
3500 */
3501 struct md_rdev *rdev;
3502
3503 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3504 rdev_for_each(rdev, mddev)
3505 if (!test_bit(Journal, &rdev->flags) &&
3506 !test_bit(In_sync, &rdev->flags)) {
3507 clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3508 break;
3509 }
3510 }
3511 }
3512
3513 return min(r, resync_max_sectors);
3514}
3515
3516/* Helper to return @dev name or "-" if !@dev */
3517static const char *__get_dev_name(struct dm_dev *dev)
3518{
3519 return dev ? dev->name : "-";
3520}
3521
3522static void raid_status(struct dm_target *ti, status_type_t type,
3523 unsigned int status_flags, char *result, unsigned int maxlen)
3524{
3525 struct raid_set *rs = ti->private;
3526 struct mddev *mddev = &rs->md;
3527 struct r5conf *conf = rs_is_raid456(rs) ? mddev->private : NULL;
3528 int i, max_nr_stripes = conf ? conf->max_nr_stripes : 0;
3529 unsigned long recovery;
3530 unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */
3531 unsigned int sz = 0;
3532 unsigned int rebuild_writemostly_count = 0;
3533 sector_t progress, resync_max_sectors, resync_mismatches;
3534 enum sync_state state;
3535 struct raid_type *rt;
3536
3537 switch (type) {
3538 case STATUSTYPE_INFO:
3539 /* *Should* always succeed */
3540 rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
3541 if (!rt)
3542 return;
3543
3544 DMEMIT("%s %d ", rt->name, mddev->raid_disks);
3545
3546 /* Access most recent mddev properties for status output */
3547 smp_rmb();
3548 /* Get sensible max sectors even if raid set not yet started */
3549 resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ?
3550 mddev->resync_max_sectors : mddev->dev_sectors;
3551 recovery = rs->md.recovery;
3552 state = decipher_sync_action(mddev, recovery);
3553 progress = rs_get_progress(rs, recovery, state, resync_max_sectors);
3554 resync_mismatches = mddev->last_sync_action == ACTION_CHECK ?
3555 atomic64_read(&mddev->resync_mismatches) : 0;
3556
3557 /* HM FIXME: do we want another state char for raid0? It shows 'D'/'A'/'-' now */
3558 for (i = 0; i < rs->raid_disks; i++)
3559 DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev));
3560
3561 /*
3562 * In-sync/Reshape ratio:
3563 * The in-sync ratio shows the progress of:
3564 * - Initializing the raid set
3565 * - Rebuilding a subset of devices of the raid set
3566 * The user can distinguish between the two by referring
3567 * to the status characters.
3568 *
3569 * The reshape ratio shows the progress of
3570 * changing the raid layout or the number of
3571 * disks of a raid set
3572 */
3573 DMEMIT(" %llu/%llu", (unsigned long long) progress,
3574 (unsigned long long) resync_max_sectors);
3575
3576 /*
3577 * v1.5.0+:
3578 *
3579 * Sync action:
3580 * See Documentation/admin-guide/device-mapper/dm-raid.rst for
3581 * information on each of these states.
3582 */
3583 DMEMIT(" %s", sync_str(state));
3584
3585 /*
3586 * v1.5.0+:
3587 *
3588 * resync_mismatches/mismatch_cnt
3589 * This field shows the number of discrepancies found when
3590 * performing a "check" of the raid set.
3591 */
3592 DMEMIT(" %llu", (unsigned long long) resync_mismatches);
3593
3594 /*
3595 * v1.9.0+:
3596 *
3597 * data_offset (needed for out of space reshaping)
3598 * This field shows the data offset into the data
3599 * image LV where the first stripes data starts.
3600 *
3601 * We keep data_offset equal on all raid disks of the set,
3602 * so retrieving it from the first raid disk is sufficient.
3603 */
3604 DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset);
3605
3606 /*
3607 * v1.10.0+:
3608 */
3609 DMEMIT(" %s", test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ?
3610 __raid_dev_status(rs, &rs->journal_dev.rdev) : "-");
3611 break;
3612
3613 case STATUSTYPE_TABLE:
3614 /* Report the table line string you would use to construct this raid set */
3615
3616 /*
3617 * Count any rebuild or writemostly argument pairs and subtract the
3618 * hweight count being added below of any rebuild and writemostly ctr flags.
3619 */
3620 for (i = 0; i < rs->raid_disks; i++) {
3621 rebuild_writemostly_count += (test_bit(i, (void *) rs->rebuild_disks) ? 2 : 0) +
3622 (test_bit(WriteMostly, &rs->dev[i].rdev.flags) ? 2 : 0);
3623 }
3624 rebuild_writemostly_count -= (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) ? 2 : 0) +
3625 (test_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags) ? 2 : 0);
3626 /* Calculate raid parameter count based on ^ rebuild/writemostly argument counts and ctr flags set. */
3627 raid_param_cnt += rebuild_writemostly_count +
3628 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) +
3629 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2;
3630 /* Emit table line */
3631 /* This has to be in the documented order for userspace! */
3632 DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors);
3633 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
3634 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC));
3635 if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
3636 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC));
3637 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags))
3638 for (i = 0; i < rs->raid_disks; i++)
3639 if (test_bit(i, (void *) rs->rebuild_disks))
3640 DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD), i);
3641 if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags))
3642 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP),
3643 mddev->bitmap_info.daemon_sleep);
3644 if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags))
3645 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE),
3646 mddev->sync_speed_min);
3647 if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags))
3648 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE),
3649 mddev->sync_speed_max);
3650 if (test_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags))
3651 for (i = 0; i < rs->raid_disks; i++)
3652 if (test_bit(WriteMostly, &rs->dev[i].rdev.flags))
3653 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY),
3654 rs->dev[i].rdev.raid_disk);
3655 if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags))
3656 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND),
3657 mddev->bitmap_info.max_write_behind);
3658 if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags))
3659 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE),
3660 max_nr_stripes);
3661 if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags))
3662 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE),
3663 (unsigned long long) to_sector(mddev->bitmap_info.chunksize));
3664 if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags))
3665 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES),
3666 raid10_md_layout_to_copies(mddev->layout));
3667 if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags))
3668 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT),
3669 raid10_md_layout_to_format(mddev->layout));
3670 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags))
3671 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS),
3672 max(rs->delta_disks, mddev->delta_disks));
3673 if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags))
3674 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET),
3675 (unsigned long long) rs->data_offset);
3676 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags))
3677 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV),
3678 __get_dev_name(rs->journal_dev.dev));
3679 if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags))
3680 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE),
3681 md_journal_mode_to_dm_raid(rs->journal_dev.mode));
3682 DMEMIT(" %d", rs->raid_disks);
3683 for (i = 0; i < rs->raid_disks; i++)
3684 DMEMIT(" %s %s", __get_dev_name(rs->dev[i].meta_dev),
3685 __get_dev_name(rs->dev[i].data_dev));
3686 break;
3687
3688 case STATUSTYPE_IMA:
3689 rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
3690 if (!rt)
3691 return;
3692
3693 DMEMIT_TARGET_NAME_VERSION(ti->type);
3694 DMEMIT(",raid_type=%s,raid_disks=%d", rt->name, mddev->raid_disks);
3695
3696 /* Access most recent mddev properties for status output */
3697 smp_rmb();
3698 recovery = rs->md.recovery;
3699 state = decipher_sync_action(mddev, recovery);
3700 DMEMIT(",raid_state=%s", sync_str(state));
3701
3702 for (i = 0; i < rs->raid_disks; i++) {
3703 DMEMIT(",raid_device_%d_status=", i);
3704 DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev));
3705 }
3706
3707 if (rt_is_raid456(rt)) {
3708 DMEMIT(",journal_dev_mode=");
3709 switch (rs->journal_dev.mode) {
3710 case R5C_JOURNAL_MODE_WRITE_THROUGH:
3711 DMEMIT("%s",
3712 _raid456_journal_mode[R5C_JOURNAL_MODE_WRITE_THROUGH].param);
3713 break;
3714 case R5C_JOURNAL_MODE_WRITE_BACK:
3715 DMEMIT("%s",
3716 _raid456_journal_mode[R5C_JOURNAL_MODE_WRITE_BACK].param);
3717 break;
3718 default:
3719 DMEMIT("invalid");
3720 break;
3721 }
3722 }
3723 DMEMIT(";");
3724 break;
3725 }
3726}
3727
3728static int raid_message(struct dm_target *ti, unsigned int argc, char **argv,
3729 char *result, unsigned int maxlen)
3730{
3731 struct raid_set *rs = ti->private;
3732 struct mddev *mddev = &rs->md;
3733 int ret = 0;
3734
3735 if (!mddev->pers || !mddev->pers->sync_request)
3736 return -EINVAL;
3737
3738 if (test_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags) ||
3739 test_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags))
3740 return -EBUSY;
3741
3742 if (!strcasecmp(argv[0], "frozen")) {
3743 ret = mddev_lock(mddev);
3744 if (ret)
3745 return ret;
3746
3747 md_frozen_sync_thread(mddev);
3748 mddev_unlock(mddev);
3749 } else if (!strcasecmp(argv[0], "idle")) {
3750 ret = mddev_lock(mddev);
3751 if (ret)
3752 return ret;
3753
3754 md_idle_sync_thread(mddev);
3755 mddev_unlock(mddev);
3756 }
3757
3758 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3759 if (decipher_sync_action(mddev, mddev->recovery) != st_idle)
3760 return -EBUSY;
3761 else if (!strcasecmp(argv[0], "resync"))
3762 ; /* MD_RECOVERY_NEEDED set below */
3763 else if (!strcasecmp(argv[0], "recover"))
3764 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3765 else {
3766 if (!strcasecmp(argv[0], "check")) {
3767 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3768 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3769 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3770 } else if (!strcasecmp(argv[0], "repair")) {
3771 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3772 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3773 } else
3774 return -EINVAL;
3775 }
3776 if (mddev->ro == 2) {
3777 /* A write to sync_action is enough to justify
3778 * canceling read-auto mode
3779 */
3780 mddev->ro = 0;
3781 if (!mddev->suspended)
3782 md_wakeup_thread(mddev->sync_thread);
3783 }
3784 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3785 if (!mddev->suspended)
3786 md_wakeup_thread(mddev->thread);
3787
3788 return 0;
3789}
3790
3791static int raid_iterate_devices(struct dm_target *ti,
3792 iterate_devices_callout_fn fn, void *data)
3793{
3794 struct raid_set *rs = ti->private;
3795 unsigned int i;
3796 int r = 0;
3797
3798 for (i = 0; !r && i < rs->raid_disks; i++) {
3799 if (rs->dev[i].data_dev) {
3800 r = fn(ti, rs->dev[i].data_dev,
3801 0, /* No offset on data devs */
3802 rs->md.dev_sectors, data);
3803 }
3804 }
3805
3806 return r;
3807}
3808
3809static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
3810{
3811 struct raid_set *rs = ti->private;
3812 unsigned int chunk_size_bytes = to_bytes(rs->md.chunk_sectors);
3813
3814 limits->io_min = chunk_size_bytes;
3815 limits->io_opt = chunk_size_bytes * mddev_data_stripes(rs);
3816}
3817
3818static void raid_presuspend(struct dm_target *ti)
3819{
3820 struct raid_set *rs = ti->private;
3821 struct mddev *mddev = &rs->md;
3822
3823 /*
3824 * From now on, disallow raid_message() to change sync_thread until
3825 * resume, raid_postsuspend() is too late.
3826 */
3827 set_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags);
3828
3829 if (!reshape_interrupted(mddev))
3830 return;
3831
3832 /*
3833 * For raid456, if reshape is interrupted, IO across reshape position
3834 * will never make progress, while caller will wait for IO to be done.
3835 * Inform raid456 to handle those IO to prevent deadlock.
3836 */
3837 if (mddev->pers && mddev->pers->prepare_suspend)
3838 mddev->pers->prepare_suspend(mddev);
3839}
3840
3841static void raid_presuspend_undo(struct dm_target *ti)
3842{
3843 struct raid_set *rs = ti->private;
3844
3845 clear_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags);
3846}
3847
3848static void raid_postsuspend(struct dm_target *ti)
3849{
3850 struct raid_set *rs = ti->private;
3851
3852 if (!test_and_set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) {
3853 /*
3854 * sync_thread must be stopped during suspend, and writes have
3855 * to be stopped before suspending to avoid deadlocks.
3856 */
3857 md_stop_writes(&rs->md);
3858 mddev_suspend(&rs->md, false);
3859 }
3860}
3861
3862static void attempt_restore_of_faulty_devices(struct raid_set *rs)
3863{
3864 int i;
3865 uint64_t cleared_failed_devices[DISKS_ARRAY_ELEMS];
3866 unsigned long flags;
3867 bool cleared = false;
3868 struct dm_raid_superblock *sb;
3869 struct mddev *mddev = &rs->md;
3870 struct md_rdev *r;
3871
3872 /* RAID personalities have to provide hot add/remove methods or we need to bail out. */
3873 if (!mddev->pers || !mddev->pers->hot_add_disk || !mddev->pers->hot_remove_disk)
3874 return;
3875
3876 memset(cleared_failed_devices, 0, sizeof(cleared_failed_devices));
3877
3878 for (i = 0; i < rs->raid_disks; i++) {
3879 r = &rs->dev[i].rdev;
3880 /* HM FIXME: enhance journal device recovery processing */
3881 if (test_bit(Journal, &r->flags))
3882 continue;
3883
3884 if (test_bit(Faulty, &r->flags) &&
3885 r->meta_bdev && !read_disk_sb(r, r->sb_size, true)) {
3886 DMINFO("Faulty %s device #%d has readable super block."
3887 " Attempting to revive it.",
3888 rs->raid_type->name, i);
3889
3890 /*
3891 * Faulty bit may be set, but sometimes the array can
3892 * be suspended before the personalities can respond
3893 * by removing the device from the array (i.e. calling
3894 * 'hot_remove_disk'). If they haven't yet removed
3895 * the failed device, its 'raid_disk' number will be
3896 * '>= 0' - meaning we must call this function
3897 * ourselves.
3898 */
3899 flags = r->flags;
3900 clear_bit(In_sync, &r->flags); /* Mandatory for hot remove. */
3901 if (r->raid_disk >= 0) {
3902 if (mddev->pers->hot_remove_disk(mddev, r)) {
3903 /* Failed to revive this device, try next */
3904 r->flags = flags;
3905 continue;
3906 }
3907 } else
3908 r->raid_disk = r->saved_raid_disk = i;
3909
3910 clear_bit(Faulty, &r->flags);
3911 clear_bit(WriteErrorSeen, &r->flags);
3912
3913 if (mddev->pers->hot_add_disk(mddev, r)) {
3914 /* Failed to revive this device, try next */
3915 r->raid_disk = r->saved_raid_disk = -1;
3916 r->flags = flags;
3917 } else {
3918 clear_bit(In_sync, &r->flags);
3919 r->recovery_offset = 0;
3920 set_bit(i, (void *) cleared_failed_devices);
3921 cleared = true;
3922 }
3923 }
3924 }
3925
3926 /* If any failed devices could be cleared, update all sbs failed_devices bits */
3927 if (cleared) {
3928 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
3929
3930 rdev_for_each(r, &rs->md) {
3931 if (test_bit(Journal, &r->flags))
3932 continue;
3933
3934 sb = page_address(r->sb_page);
3935 sb_retrieve_failed_devices(sb, failed_devices);
3936
3937 for (i = 0; i < DISKS_ARRAY_ELEMS; i++)
3938 failed_devices[i] &= ~cleared_failed_devices[i];
3939
3940 sb_update_failed_devices(sb, failed_devices);
3941 }
3942 }
3943}
3944
3945static int __load_dirty_region_bitmap(struct raid_set *rs)
3946{
3947 int r = 0;
3948
3949 /* Try loading the bitmap unless "raid0", which does not have one */
3950 if (!rs_is_raid0(rs) &&
3951 !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) {
3952 struct mddev *mddev = &rs->md;
3953
3954 r = mddev->bitmap_ops->load(mddev);
3955 if (r)
3956 DMERR("Failed to load bitmap");
3957 }
3958
3959 return r;
3960}
3961
3962/* Enforce updating all superblocks */
3963static void rs_update_sbs(struct raid_set *rs)
3964{
3965 struct mddev *mddev = &rs->md;
3966 int ro = mddev->ro;
3967
3968 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3969 mddev->ro = 0;
3970 md_update_sb(mddev, 1);
3971 mddev->ro = ro;
3972}
3973
3974/*
3975 * Reshape changes raid algorithm of @rs to new one within personality
3976 * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes
3977 * disks from a raid set thus growing/shrinking it or resizes the set
3978 *
3979 * Call mddev_lock_nointr() before!
3980 */
3981static int rs_start_reshape(struct raid_set *rs)
3982{
3983 int r;
3984 struct mddev *mddev = &rs->md;
3985 struct md_personality *pers = mddev->pers;
3986
3987 /* Don't allow the sync thread to work until the table gets reloaded. */
3988 set_bit(MD_RECOVERY_WAIT, &mddev->recovery);
3989
3990 r = rs_setup_reshape(rs);
3991 if (r)
3992 return r;
3993
3994 /*
3995 * Check any reshape constraints enforced by the personalility
3996 *
3997 * May as well already kick the reshape off so that * pers->start_reshape() becomes optional.
3998 */
3999 r = pers->check_reshape(mddev);
4000 if (r) {
4001 rs->ti->error = "pers->check_reshape() failed";
4002 return r;
4003 }
4004
4005 /*
4006 * Personality may not provide start reshape method in which
4007 * case check_reshape above has already covered everything
4008 */
4009 if (pers->start_reshape) {
4010 r = pers->start_reshape(mddev);
4011 if (r) {
4012 rs->ti->error = "pers->start_reshape() failed";
4013 return r;
4014 }
4015 }
4016
4017 /*
4018 * Now reshape got set up, update superblocks to
4019 * reflect the fact so that a table reload will
4020 * access proper superblock content in the ctr.
4021 */
4022 rs_update_sbs(rs);
4023
4024 return 0;
4025}
4026
4027static int raid_preresume(struct dm_target *ti)
4028{
4029 int r;
4030 struct raid_set *rs = ti->private;
4031 struct mddev *mddev = &rs->md;
4032
4033 /* This is a resume after a suspend of the set -> it's already started. */
4034 if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags))
4035 return 0;
4036
4037 /* If different and no explicit grow request, expose MD array size as of superblock. */
4038 if (!test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags) &&
4039 rs->array_sectors != mddev->array_sectors)
4040 rs_set_capacity(rs);
4041
4042 /*
4043 * The superblocks need to be updated on disk if the
4044 * array is new or new devices got added (thus zeroed
4045 * out by userspace) or __load_dirty_region_bitmap
4046 * will overwrite them in core with old data or fail.
4047 */
4048 if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags))
4049 rs_update_sbs(rs);
4050
4051 /* Load the bitmap from disk unless raid0 */
4052 r = __load_dirty_region_bitmap(rs);
4053 if (r)
4054 return r;
4055
4056 /* We are extending the raid set size, adjust mddev/md_rdev sizes and set capacity. */
4057 if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags)) {
4058 mddev->array_sectors = rs->array_sectors;
4059 mddev->dev_sectors = rs->dev_sectors;
4060 rs_set_rdev_sectors(rs);
4061 rs_set_capacity(rs);
4062 }
4063
4064 /* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) or grown device size */
4065 if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) && mddev->bitmap &&
4066 (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags) ||
4067 (rs->requested_bitmap_chunk_sectors &&
4068 mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)))) {
4069 int chunksize = to_bytes(rs->requested_bitmap_chunk_sectors) ?: mddev->bitmap_info.chunksize;
4070
4071 r = mddev->bitmap_ops->resize(mddev, mddev->dev_sectors,
4072 chunksize, false);
4073 if (r)
4074 DMERR("Failed to resize bitmap");
4075 }
4076
4077 /* Check for any resize/reshape on @rs and adjust/initiate */
4078 if (mddev->recovery_cp && mddev->recovery_cp < MaxSector) {
4079 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
4080 mddev->resync_min = mddev->recovery_cp;
4081 if (test_bit(RT_FLAG_RS_GROW, &rs->runtime_flags))
4082 mddev->resync_max_sectors = mddev->dev_sectors;
4083 }
4084
4085 /* Check for any reshape request unless new raid set */
4086 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
4087 /* Initiate a reshape. */
4088 rs_set_rdev_sectors(rs);
4089 mddev_lock_nointr(mddev);
4090 r = rs_start_reshape(rs);
4091 mddev_unlock(mddev);
4092 if (r)
4093 DMWARN("Failed to check/start reshape, continuing without change");
4094 r = 0;
4095 }
4096
4097 return r;
4098}
4099
4100static void raid_resume(struct dm_target *ti)
4101{
4102 struct raid_set *rs = ti->private;
4103 struct mddev *mddev = &rs->md;
4104
4105 if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) {
4106 /*
4107 * A secondary resume while the device is active.
4108 * Take this opportunity to check whether any failed
4109 * devices are reachable again.
4110 */
4111 mddev_lock_nointr(mddev);
4112 attempt_restore_of_faulty_devices(rs);
4113 mddev_unlock(mddev);
4114 }
4115
4116 if (test_and_clear_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) {
4117 /* Only reduce raid set size before running a disk removing reshape. */
4118 if (mddev->delta_disks < 0)
4119 rs_set_capacity(rs);
4120
4121 mddev_lock_nointr(mddev);
4122 WARN_ON_ONCE(!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery));
4123 WARN_ON_ONCE(rcu_dereference_protected(mddev->sync_thread,
4124 lockdep_is_held(&mddev->reconfig_mutex)));
4125 clear_bit(RT_FLAG_RS_FROZEN, &rs->runtime_flags);
4126 mddev->ro = 0;
4127 mddev->in_sync = 0;
4128 md_unfrozen_sync_thread(mddev);
4129 mddev_unlock_and_resume(mddev);
4130 }
4131}
4132
4133static struct target_type raid_target = {
4134 .name = "raid",
4135 .version = {1, 15, 1},
4136 .module = THIS_MODULE,
4137 .ctr = raid_ctr,
4138 .dtr = raid_dtr,
4139 .map = raid_map,
4140 .status = raid_status,
4141 .message = raid_message,
4142 .iterate_devices = raid_iterate_devices,
4143 .io_hints = raid_io_hints,
4144 .presuspend = raid_presuspend,
4145 .presuspend_undo = raid_presuspend_undo,
4146 .postsuspend = raid_postsuspend,
4147 .preresume = raid_preresume,
4148 .resume = raid_resume,
4149};
4150module_dm(raid);
4151
4152module_param(devices_handle_discard_safely, bool, 0644);
4153MODULE_PARM_DESC(devices_handle_discard_safely,
4154 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
4155
4156MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target");
4157MODULE_ALIAS("dm-raid0");
4158MODULE_ALIAS("dm-raid1");
4159MODULE_ALIAS("dm-raid10");
4160MODULE_ALIAS("dm-raid4");
4161MODULE_ALIAS("dm-raid5");
4162MODULE_ALIAS("dm-raid6");
4163MODULE_AUTHOR("Neil Brown <dm-devel@lists.linux.dev>");
4164MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@lists.linux.dev>");
4165MODULE_LICENSE("GPL");