projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'pwm/for-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry...
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / md / dm-raid.c
1 /*
2 * Copyright (C) 2010-2011 Neil Brown
3 * Copyright (C) 2010-2017 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
27 /*
28 * Minimum journal space 4 MiB in sectors.
29 */
30 #define MIN_RAID456_JOURNAL_SPACE (4*2048)
31
32 static bool devices_handle_discard_safely = false;
33
34 /*
35 * The following flags are used by dm-raid.c to set up the array state.
36 * They must be cleared before md_run is called.
37 */
38 #define FirstUse 10 /* rdev flag */
39
40 struct raid_dev {
41 /*
42 * Two DM devices, one to hold metadata and one to hold the
43 * actual data/parity. The reason for this is to not confuse
44 * ti->len and give more flexibility in altering size and
45 * characteristics.
46 *
47 * While it is possible for this device to be associated
48 * with a different physical device than the data_dev, it
49 * is intended for it to be the same.
50 * |--------- Physical Device ---------|
51 * |- meta_dev -|------ data_dev ------|
52 */
53 struct dm_dev *meta_dev;
54 struct dm_dev *data_dev;
55 struct md_rdev rdev;
56 };
57
58 /*
59 * Bits for establishing rs->ctr_flags
60 *
61 * 1 = no flag value
62 * 2 = flag with value
63 */
64 #define __CTR_FLAG_SYNC 0 /* 1 */ /* Not with raid0! */
65 #define __CTR_FLAG_NOSYNC 1 /* 1 */ /* Not with raid0! */
66 #define __CTR_FLAG_REBUILD 2 /* 2 */ /* Not with raid0! */
67 #define __CTR_FLAG_DAEMON_SLEEP 3 /* 2 */ /* Not with raid0! */
68 #define __CTR_FLAG_MIN_RECOVERY_RATE 4 /* 2 */ /* Not with raid0! */
69 #define __CTR_FLAG_MAX_RECOVERY_RATE 5 /* 2 */ /* Not with raid0! */
70 #define __CTR_FLAG_MAX_WRITE_BEHIND 6 /* 2 */ /* Only with raid1! */
71 #define __CTR_FLAG_WRITE_MOSTLY 7 /* 2 */ /* Only with raid1! */
72 #define __CTR_FLAG_STRIPE_CACHE 8 /* 2 */ /* Only with raid4/5/6! */
73 #define __CTR_FLAG_REGION_SIZE 9 /* 2 */ /* Not with raid0! */
74 #define __CTR_FLAG_RAID10_COPIES 10 /* 2 */ /* Only with raid10 */
75 #define __CTR_FLAG_RAID10_FORMAT 11 /* 2 */ /* Only with raid10 */
76 /* New for v1.9.0 */
77 #define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid1/4/5/6/10! */
78 #define __CTR_FLAG_DATA_OFFSET 13 /* 2 */ /* Only with reshapable raid4/5/6/10! */
79 #define __CTR_FLAG_RAID10_USE_NEAR_SETS 14 /* 2 */ /* Only with raid10! */
80
81 /* New for v1.10.0 */
82 #define __CTR_FLAG_JOURNAL_DEV 15 /* 2 */ /* Only with raid4/5/6 (journal device)! */
83
84 /* New for v1.11.1 */
85 #define __CTR_FLAG_JOURNAL_MODE 16 /* 2 */ /* Only with raid4/5/6 (journal mode)! */
86
87 /*
88 * Flags for rs->ctr_flags field.
89 */
90 #define CTR_FLAG_SYNC (1 << __CTR_FLAG_SYNC)
91 #define CTR_FLAG_NOSYNC (1 << __CTR_FLAG_NOSYNC)
92 #define CTR_FLAG_REBUILD (1 << __CTR_FLAG_REBUILD)
93 #define CTR_FLAG_DAEMON_SLEEP (1 << __CTR_FLAG_DAEMON_SLEEP)
94 #define CTR_FLAG_MIN_RECOVERY_RATE (1 << __CTR_FLAG_MIN_RECOVERY_RATE)
95 #define CTR_FLAG_MAX_RECOVERY_RATE (1 << __CTR_FLAG_MAX_RECOVERY_RATE)
96 #define CTR_FLAG_MAX_WRITE_BEHIND (1 << __CTR_FLAG_MAX_WRITE_BEHIND)
97 #define CTR_FLAG_WRITE_MOSTLY (1 << __CTR_FLAG_WRITE_MOSTLY)
98 #define CTR_FLAG_STRIPE_CACHE (1 << __CTR_FLAG_STRIPE_CACHE)
99 #define CTR_FLAG_REGION_SIZE (1 << __CTR_FLAG_REGION_SIZE)
100 #define CTR_FLAG_RAID10_COPIES (1 << __CTR_FLAG_RAID10_COPIES)
101 #define CTR_FLAG_RAID10_FORMAT (1 << __CTR_FLAG_RAID10_FORMAT)
102 #define CTR_FLAG_DELTA_DISKS (1 << __CTR_FLAG_DELTA_DISKS)
103 #define CTR_FLAG_DATA_OFFSET (1 << __CTR_FLAG_DATA_OFFSET)
104 #define CTR_FLAG_RAID10_USE_NEAR_SETS (1 << __CTR_FLAG_RAID10_USE_NEAR_SETS)
105 #define CTR_FLAG_JOURNAL_DEV (1 << __CTR_FLAG_JOURNAL_DEV)
106 #define CTR_FLAG_JOURNAL_MODE (1 << __CTR_FLAG_JOURNAL_MODE)
107
108 #define RESUME_STAY_FROZEN_FLAGS (CTR_FLAG_DELTA_DISKS | CTR_FLAG_DATA_OFFSET)
109
110 /*
111 * Definitions of various constructor flags to
112 * be used in checks of valid / invalid flags
113 * per raid level.
114 */
115 /* Define all any sync flags */
116 #define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)
117
118 /* Define flags for options without argument (e.g. 'nosync') */
119 #define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \
120 CTR_FLAG_RAID10_USE_NEAR_SETS)
121
122 /* Define flags for options with one argument (e.g. 'delta_disks +2') */
123 #define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \
124 CTR_FLAG_WRITE_MOSTLY | \
125 CTR_FLAG_DAEMON_SLEEP | \
126 CTR_FLAG_MIN_RECOVERY_RATE | \
127 CTR_FLAG_MAX_RECOVERY_RATE | \
128 CTR_FLAG_MAX_WRITE_BEHIND | \
129 CTR_FLAG_STRIPE_CACHE | \
130 CTR_FLAG_REGION_SIZE | \
131 CTR_FLAG_RAID10_COPIES | \
132 CTR_FLAG_RAID10_FORMAT | \
133 CTR_FLAG_DELTA_DISKS | \
134 CTR_FLAG_DATA_OFFSET)
135
136 /* Valid options definitions per raid level... */
137
138 /* "raid0" does only accept data offset */
139 #define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET)
140
141 /* "raid1" does not accept stripe cache, data offset, delta_disks or any raid10 options */
142 #define RAID1_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
143 CTR_FLAG_REBUILD | \
144 CTR_FLAG_WRITE_MOSTLY | \
145 CTR_FLAG_DAEMON_SLEEP | \
146 CTR_FLAG_MIN_RECOVERY_RATE | \
147 CTR_FLAG_MAX_RECOVERY_RATE | \
148 CTR_FLAG_MAX_WRITE_BEHIND | \
149 CTR_FLAG_REGION_SIZE | \
150 CTR_FLAG_DELTA_DISKS | \
151 CTR_FLAG_DATA_OFFSET)
152
153 /* "raid10" does not accept any raid1 or stripe cache options */
154 #define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
155 CTR_FLAG_REBUILD | \
156 CTR_FLAG_DAEMON_SLEEP | \
157 CTR_FLAG_MIN_RECOVERY_RATE | \
158 CTR_FLAG_MAX_RECOVERY_RATE | \
159 CTR_FLAG_REGION_SIZE | \
160 CTR_FLAG_RAID10_COPIES | \
161 CTR_FLAG_RAID10_FORMAT | \
162 CTR_FLAG_DELTA_DISKS | \
163 CTR_FLAG_DATA_OFFSET | \
164 CTR_FLAG_RAID10_USE_NEAR_SETS)
165
166 /*
167 * "raid4/5/6" do not accept any raid1 or raid10 specific options
168 *
169 * "raid6" does not accept "nosync", because it is not guaranteed
170 * that both parity and q-syndrome are being written properly with
171 * any writes
172 */
173 #define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
174 CTR_FLAG_REBUILD | \
175 CTR_FLAG_DAEMON_SLEEP | \
176 CTR_FLAG_MIN_RECOVERY_RATE | \
177 CTR_FLAG_MAX_RECOVERY_RATE | \
178 CTR_FLAG_STRIPE_CACHE | \
179 CTR_FLAG_REGION_SIZE | \
180 CTR_FLAG_DELTA_DISKS | \
181 CTR_FLAG_DATA_OFFSET | \
182 CTR_FLAG_JOURNAL_DEV | \
183 CTR_FLAG_JOURNAL_MODE)
184
185 #define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \
186 CTR_FLAG_REBUILD | \
187 CTR_FLAG_DAEMON_SLEEP | \
188 CTR_FLAG_MIN_RECOVERY_RATE | \
189 CTR_FLAG_MAX_RECOVERY_RATE | \
190 CTR_FLAG_STRIPE_CACHE | \
191 CTR_FLAG_REGION_SIZE | \
192 CTR_FLAG_DELTA_DISKS | \
193 CTR_FLAG_DATA_OFFSET | \
194 CTR_FLAG_JOURNAL_DEV | \
195 CTR_FLAG_JOURNAL_MODE)
196 /* ...valid options definitions per raid level */
197
198 /*
199 * Flags for rs->runtime_flags field
200 * (RT_FLAG prefix meaning "runtime flag")
201 *
202 * These are all internal and used to define runtime state,
203 * e.g. to prevent another resume from preresume processing
204 * the raid set all over again.
205 */
206 #define RT_FLAG_RS_PRERESUMED 0
207 #define RT_FLAG_RS_RESUMED 1
208 #define RT_FLAG_RS_BITMAP_LOADED 2
209 #define RT_FLAG_UPDATE_SBS 3
210 #define RT_FLAG_RESHAPE_RS 4
211
212 /* Array elements of 64 bit needed for rebuild/failed disk bits */
213 #define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8)
214
215 /*
216 * raid set level, layout and chunk sectors backup/restore
217 */
218 struct rs_layout {
219 int new_level;
220 int new_layout;
221 int new_chunk_sectors;
222 };
223
224 struct raid_set {
225 struct dm_target *ti;
226
227 uint32_t bitmap_loaded;
228 uint32_t stripe_cache_entries;
229 unsigned long ctr_flags;
230 unsigned long runtime_flags;
231
232 uint64_t rebuild_disks[DISKS_ARRAY_ELEMS];
233
234 int raid_disks;
235 int delta_disks;
236 int data_offset;
237 int raid10_copies;
238 int requested_bitmap_chunk_sectors;
239
240 struct mddev md;
241 struct raid_type *raid_type;
242 struct dm_target_callbacks callbacks;
243
244 /* Optional raid4/5/6 journal device */
245 struct journal_dev {
246 struct dm_dev *dev;
247 struct md_rdev rdev;
248 int mode;
249 } journal_dev;
250
251 struct raid_dev dev[0];
252 };
253
254 static void rs_config_backup(struct raid_set *rs, struct rs_layout *l)
255 {
256 struct mddev *mddev = &rs->md;
257
258 l->new_level = mddev->new_level;
259 l->new_layout = mddev->new_layout;
260 l->new_chunk_sectors = mddev->new_chunk_sectors;
261 }
262
263 static void rs_config_restore(struct raid_set *rs, struct rs_layout *l)
264 {
265 struct mddev *mddev = &rs->md;
266
267 mddev->new_level = l->new_level;
268 mddev->new_layout = l->new_layout;
269 mddev->new_chunk_sectors = l->new_chunk_sectors;
270 }
271
272 /* raid10 algorithms (i.e. formats) */
273 #define ALGORITHM_RAID10_DEFAULT 0
274 #define ALGORITHM_RAID10_NEAR 1
275 #define ALGORITHM_RAID10_OFFSET 2
276 #define ALGORITHM_RAID10_FAR 3
277
278 /* Supported raid types and properties. */
279 static struct raid_type {
280 const char *name; /* RAID algorithm. */
281 const char *descr; /* Descriptor text for logging. */
282 const unsigned int parity_devs; /* # of parity devices. */
283 const unsigned int minimal_devs;/* minimal # of devices in set. */
284 const unsigned int level; /* RAID level. */
285 const unsigned int algorithm; /* RAID algorithm. */
286 } raid_types[] = {
287 {"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */},
288 {"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */},
289 {"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR},
290 {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET},
291 {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR},
292 {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT},
293 {"raid4", "raid4 (dedicated first parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, /* raid4 layout = raid5_0 */
294 {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N},
295 {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
296 {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
297 {"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
298 {"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
299 {"raid6_zr", "raid6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART},
300 {"raid6_nr", "raid6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART},
301 {"raid6_nc", "raid6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE},
302 {"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6},
303 {"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6},
304 {"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6},
305 {"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6},
306 {"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6}
307 };
308
309 /* True, if @v is in inclusive range [@min, @max] */
310 static bool __within_range(long v, long min, long max)
311 {
312 return v >= min && v <= max;
313 }
314
315 /* All table line arguments are defined here */
316 static struct arg_name_flag {
317 const unsigned long flag;
318 const char *name;
319 } __arg_name_flags[] = {
320 { CTR_FLAG_SYNC, "sync"},
321 { CTR_FLAG_NOSYNC, "nosync"},
322 { CTR_FLAG_REBUILD, "rebuild"},
323 { CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"},
324 { CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"},
325 { CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"},
326 { CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"},
327 { CTR_FLAG_WRITE_MOSTLY, "write_mostly"},
328 { CTR_FLAG_STRIPE_CACHE, "stripe_cache"},
329 { CTR_FLAG_REGION_SIZE, "region_size"},
330 { CTR_FLAG_RAID10_COPIES, "raid10_copies"},
331 { CTR_FLAG_RAID10_FORMAT, "raid10_format"},
332 { CTR_FLAG_DATA_OFFSET, "data_offset"},
333 { CTR_FLAG_DELTA_DISKS, "delta_disks"},
334 { CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"},
335 { CTR_FLAG_JOURNAL_DEV, "journal_dev" },
336 { CTR_FLAG_JOURNAL_MODE, "journal_mode" },
337 };
338
339 /* Return argument name string for given @flag */
340 static const char *dm_raid_arg_name_by_flag(const uint32_t flag)
341 {
342 if (hweight32(flag) == 1) {
343 struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags);
344
345 while (anf-- > __arg_name_flags)
346 if (flag & anf->flag)
347 return anf->name;
348
349 } else
350 DMERR("%s called with more than one flag!", __func__);
351
352 return NULL;
353 }
354
355 /* Define correlation of raid456 journal cache modes and dm-raid target line parameters */
356 static struct {
357 const int mode;
358 const char *param;
359 } _raid456_journal_mode[] = {
360 { R5C_JOURNAL_MODE_WRITE_THROUGH , "writethrough" },
361 { R5C_JOURNAL_MODE_WRITE_BACK , "writeback" }
362 };
363
364 /* Return MD raid4/5/6 journal mode for dm @journal_mode one */
365 static int dm_raid_journal_mode_to_md(const char *mode)
366 {
367 int m = ARRAY_SIZE(_raid456_journal_mode);
368
369 while (m--)
370 if (!strcasecmp(mode, _raid456_journal_mode[m].param))
371 return _raid456_journal_mode[m].mode;
372
373 return -EINVAL;
374 }
375
376 /* Return dm-raid raid4/5/6 journal mode string for @mode */
377 static const char *md_journal_mode_to_dm_raid(const int mode)
378 {
379 int m = ARRAY_SIZE(_raid456_journal_mode);
380
381 while (m--)
382 if (mode == _raid456_journal_mode[m].mode)
383 return _raid456_journal_mode[m].param;
384
385 return "unknown";
386 }
387
388 /*
389 * Bool helpers to test for various raid levels of a raid set.
390 * It's level as reported by the superblock rather than
391 * the requested raid_type passed to the constructor.
392 */
393 /* Return true, if raid set in @rs is raid0 */
394 static bool rs_is_raid0(struct raid_set *rs)
395 {
396 return !rs->md.level;
397 }
398
399 /* Return true, if raid set in @rs is raid1 */
400 static bool rs_is_raid1(struct raid_set *rs)
401 {
402 return rs->md.level == 1;
403 }
404
405 /* Return true, if raid set in @rs is raid10 */
406 static bool rs_is_raid10(struct raid_set *rs)
407 {
408 return rs->md.level == 10;
409 }
410
411 /* Return true, if raid set in @rs is level 6 */
412 static bool rs_is_raid6(struct raid_set *rs)
413 {
414 return rs->md.level == 6;
415 }
416
417 /* Return true, if raid set in @rs is level 4, 5 or 6 */
418 static bool rs_is_raid456(struct raid_set *rs)
419 {
420 return __within_range(rs->md.level, 4, 6);
421 }
422
423 /* Return true, if raid set in @rs is reshapable */
424 static bool __is_raid10_far(int layout);
425 static bool rs_is_reshapable(struct raid_set *rs)
426 {
427 return rs_is_raid456(rs) ||
428 (rs_is_raid10(rs) && !__is_raid10_far(rs->md.new_layout));
429 }
430
431 /* Return true, if raid set in @rs is recovering */
432 static bool rs_is_recovering(struct raid_set *rs)
433 {
434 return rs->md.recovery_cp < rs->md.dev_sectors;
435 }
436
437 /* Return true, if raid set in @rs is reshaping */
438 static bool rs_is_reshaping(struct raid_set *rs)
439 {
440 return rs->md.reshape_position != MaxSector;
441 }
442
443 /*
444 * bool helpers to test for various raid levels of a raid type @rt
445 */
446
447 /* Return true, if raid type in @rt is raid0 */
448 static bool rt_is_raid0(struct raid_type *rt)
449 {
450 return !rt->level;
451 }
452
453 /* Return true, if raid type in @rt is raid1 */
454 static bool rt_is_raid1(struct raid_type *rt)
455 {
456 return rt->level == 1;
457 }
458
459 /* Return true, if raid type in @rt is raid10 */
460 static bool rt_is_raid10(struct raid_type *rt)
461 {
462 return rt->level == 10;
463 }
464
465 /* Return true, if raid type in @rt is raid4/5 */
466 static bool rt_is_raid45(struct raid_type *rt)
467 {
468 return __within_range(rt->level, 4, 5);
469 }
470
471 /* Return true, if raid type in @rt is raid6 */
472 static bool rt_is_raid6(struct raid_type *rt)
473 {
474 return rt->level == 6;
475 }
476
477 /* Return true, if raid type in @rt is raid4/5/6 */
478 static bool rt_is_raid456(struct raid_type *rt)
479 {
480 return __within_range(rt->level, 4, 6);
481 }
482 /* END: raid level bools */
483
484 /* Return valid ctr flags for the raid level of @rs */
485 static unsigned long __valid_flags(struct raid_set *rs)
486 {
487 if (rt_is_raid0(rs->raid_type))
488 return RAID0_VALID_FLAGS;
489 else if (rt_is_raid1(rs->raid_type))
490 return RAID1_VALID_FLAGS;
491 else if (rt_is_raid10(rs->raid_type))
492 return RAID10_VALID_FLAGS;
493 else if (rt_is_raid45(rs->raid_type))
494 return RAID45_VALID_FLAGS;
495 else if (rt_is_raid6(rs->raid_type))
496 return RAID6_VALID_FLAGS;
497
498 return 0;
499 }
500
501 /*
502 * Check for valid flags set on @rs
503 *
504 * Has to be called after parsing of the ctr flags!
505 */
506 static int rs_check_for_valid_flags(struct raid_set *rs)
507 {
508 if (rs->ctr_flags & ~__valid_flags(rs)) {
509 rs->ti->error = "Invalid flags combination";
510 return -EINVAL;
511 }
512
513 return 0;
514 }
515
516 /* MD raid10 bit definitions and helpers */
517 #define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */
518 #define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */
519 #define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */
520 #define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */
521
522 /* Return md raid10 near copies for @layout */
523 static unsigned int __raid10_near_copies(int layout)
524 {
525 return layout & 0xFF;
526 }
527
528 /* Return md raid10 far copies for @layout */
529 static unsigned int __raid10_far_copies(int layout)
530 {
531 return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);
532 }
533
534 /* Return true if md raid10 offset for @layout */
535 static bool __is_raid10_offset(int layout)
536 {
537 return !!(layout & RAID10_OFFSET);
538 }
539
540 /* Return true if md raid10 near for @layout */
541 static bool __is_raid10_near(int layout)
542 {
543 return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1;
544 }
545
546 /* Return true if md raid10 far for @layout */
547 static bool __is_raid10_far(int layout)
548 {
549 return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1;
550 }
551
552 /* Return md raid10 layout string for @layout */
553 static const char *raid10_md_layout_to_format(int layout)
554 {
555 /*
556 * Bit 16 stands for "offset"
557 * (i.e. adjacent stripes hold copies)
558 *
559 * Refer to MD's raid10.c for details
560 */
561 if (__is_raid10_offset(layout))
562 return "offset";
563
564 if (__raid10_near_copies(layout) > 1)
565 return "near";
566
567 WARN_ON(__raid10_far_copies(layout) < 2);
568
569 return "far";
570 }
571
572 /* Return md raid10 algorithm for @name */
573 static int raid10_name_to_format(const char *name)
574 {
575 if (!strcasecmp(name, "near"))
576 return ALGORITHM_RAID10_NEAR;
577 else if (!strcasecmp(name, "offset"))
578 return ALGORITHM_RAID10_OFFSET;
579 else if (!strcasecmp(name, "far"))
580 return ALGORITHM_RAID10_FAR;
581
582 return -EINVAL;
583 }
584
585 /* Return md raid10 copies for @layout */
586 static unsigned int raid10_md_layout_to_copies(int layout)
587 {
588 return max(__raid10_near_copies(layout), __raid10_far_copies(layout));
589 }
590
591 /* Return md raid10 format id for @format string */
592 static int raid10_format_to_md_layout(struct raid_set *rs,
593 unsigned int algorithm,
594 unsigned int copies)
595 {
596 unsigned int n = 1, f = 1, r = 0;
597
598 /*
599 * MD resilienece flaw:
600 *
601 * enabling use_far_sets for far/offset formats causes copies
602 * to be colocated on the same devs together with their origins!
603 *
604 * -> disable it for now in the definition above
605 */
606 if (algorithm == ALGORITHM_RAID10_DEFAULT ||
607 algorithm == ALGORITHM_RAID10_NEAR)
608 n = copies;
609
610 else if (algorithm == ALGORITHM_RAID10_OFFSET) {
611 f = copies;
612 r = RAID10_OFFSET;
613 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
614 r |= RAID10_USE_FAR_SETS;
615
616 } else if (algorithm == ALGORITHM_RAID10_FAR) {
617 f = copies;
618 r = !RAID10_OFFSET;
619 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
620 r |= RAID10_USE_FAR_SETS;
621
622 } else
623 return -EINVAL;
624
625 return r | (f << RAID10_FAR_COPIES_SHIFT) | n;
626 }
627 /* END: MD raid10 bit definitions and helpers */
628
629 /* Check for any of the raid10 algorithms */
630 static bool __got_raid10(struct raid_type *rtp, const int layout)
631 {
632 if (rtp->level == 10) {
633 switch (rtp->algorithm) {
634 case ALGORITHM_RAID10_DEFAULT:
635 case ALGORITHM_RAID10_NEAR:
636 return __is_raid10_near(layout);
637 case ALGORITHM_RAID10_OFFSET:
638 return __is_raid10_offset(layout);
639 case ALGORITHM_RAID10_FAR:
640 return __is_raid10_far(layout);
641 default:
642 break;
643 }
644 }
645
646 return false;
647 }
648
649 /* Return raid_type for @name */
650 static struct raid_type *get_raid_type(const char *name)
651 {
652 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
653
654 while (rtp-- > raid_types)
655 if (!strcasecmp(rtp->name, name))
656 return rtp;
657
658 return NULL;
659 }
660
661 /* Return raid_type for @name based derived from @level and @layout */
662 static struct raid_type *get_raid_type_by_ll(const int level, const int layout)
663 {
664 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
665
666 while (rtp-- > raid_types) {
667 /* RAID10 special checks based on @layout flags/properties */
668 if (rtp->level == level &&
669 (__got_raid10(rtp, layout) || rtp->algorithm == layout))
670 return rtp;
671 }
672
673 return NULL;
674 }
675
676 /*
677 * Conditionally change bdev capacity of @rs
678 * in case of a disk add/remove reshape
679 */
680 static void rs_set_capacity(struct raid_set *rs)
681 {
682 struct mddev *mddev = &rs->md;
683 struct md_rdev *rdev;
684 struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table));
685
686 /*
687 * raid10 sets rdev->sector to the device size, which
688 * is unintended in case of out-of-place reshaping
689 */
690 rdev_for_each(rdev, mddev)
691 if (!test_bit(Journal, &rdev->flags))
692 rdev->sectors = mddev->dev_sectors;
693
694 set_capacity(gendisk, mddev->array_sectors);
695 revalidate_disk(gendisk);
696 }
697
698 /*
699 * Set the mddev properties in @rs to the current
700 * ones retrieved from the freshest superblock
701 */
702 static void rs_set_cur(struct raid_set *rs)
703 {
704 struct mddev *mddev = &rs->md;
705
706 mddev->new_level = mddev->level;
707 mddev->new_layout = mddev->layout;
708 mddev->new_chunk_sectors = mddev->chunk_sectors;
709 }
710
711 /*
712 * Set the mddev properties in @rs to the new
713 * ones requested by the ctr
714 */
715 static void rs_set_new(struct raid_set *rs)
716 {
717 struct mddev *mddev = &rs->md;
718
719 mddev->level = mddev->new_level;
720 mddev->layout = mddev->new_layout;
721 mddev->chunk_sectors = mddev->new_chunk_sectors;
722 mddev->raid_disks = rs->raid_disks;
723 mddev->delta_disks = 0;
724 }
725
726 static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *raid_type,
727 unsigned int raid_devs)
728 {
729 unsigned int i;
730 struct raid_set *rs;
731
732 if (raid_devs <= raid_type->parity_devs) {
733 ti->error = "Insufficient number of devices";
734 return ERR_PTR(-EINVAL);
735 }
736
737 rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL);
738 if (!rs) {
739 ti->error = "Cannot allocate raid context";
740 return ERR_PTR(-ENOMEM);
741 }
742
743 mddev_init(&rs->md);
744
745 rs->raid_disks = raid_devs;
746 rs->delta_disks = 0;
747
748 rs->ti = ti;
749 rs->raid_type = raid_type;
750 rs->stripe_cache_entries = 256;
751 rs->md.raid_disks = raid_devs;
752 rs->md.level = raid_type->level;
753 rs->md.new_level = rs->md.level;
754 rs->md.layout = raid_type->algorithm;
755 rs->md.new_layout = rs->md.layout;
756 rs->md.delta_disks = 0;
757 rs->md.recovery_cp = MaxSector;
758
759 for (i = 0; i < raid_devs; i++)
760 md_rdev_init(&rs->dev[i].rdev);
761
762 /*
763 * Remaining items to be initialized by further RAID params:
764 * rs->md.persistent
765 * rs->md.external
766 * rs->md.chunk_sectors
767 * rs->md.new_chunk_sectors
768 * rs->md.dev_sectors
769 */
770
771 return rs;
772 }
773
774 static void raid_set_free(struct raid_set *rs)
775 {
776 int i;
777
778 if (rs->journal_dev.dev) {
779 md_rdev_clear(&rs->journal_dev.rdev);
780 dm_put_device(rs->ti, rs->journal_dev.dev);
781 }
782
783 for (i = 0; i < rs->raid_disks; i++) {
784 if (rs->dev[i].meta_dev)
785 dm_put_device(rs->ti, rs->dev[i].meta_dev);
786 md_rdev_clear(&rs->dev[i].rdev);
787 if (rs->dev[i].data_dev)
788 dm_put_device(rs->ti, rs->dev[i].data_dev);
789 }
790
791 kfree(rs);
792 }
793
794 /*
795 * For every device we have two words
796 * <meta_dev>: meta device name or '-' if missing
797 * <data_dev>: data device name or '-' if missing
798 *
799 * The following are permitted:
800 * - -
801 * - <data_dev>
802 * <meta_dev> <data_dev>
803 *
804 * The following is not allowed:
805 * <meta_dev> -
806 *
807 * This code parses those words. If there is a failure,
808 * the caller must use raid_set_free() to unwind the operations.
809 */
810 static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as)
811 {
812 int i;
813 int rebuild = 0;
814 int metadata_available = 0;
815 int r = 0;
816 const char *arg;
817
818 /* Put off the number of raid devices argument to get to dev pairs */
819 arg = dm_shift_arg(as);
820 if (!arg)
821 return -EINVAL;
822
823 for (i = 0; i < rs->raid_disks; i++) {
824 rs->dev[i].rdev.raid_disk = i;
825
826 rs->dev[i].meta_dev = NULL;
827 rs->dev[i].data_dev = NULL;
828
829 /*
830 * There are no offsets initially.
831 * Out of place reshape will set them accordingly.
832 */
833 rs->dev[i].rdev.data_offset = 0;
834 rs->dev[i].rdev.new_data_offset = 0;
835 rs->dev[i].rdev.mddev = &rs->md;
836
837 arg = dm_shift_arg(as);
838 if (!arg)
839 return -EINVAL;
840
841 if (strcmp(arg, "-")) {
842 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
843 &rs->dev[i].meta_dev);
844 if (r) {
845 rs->ti->error = "RAID metadata device lookup failure";
846 return r;
847 }
848
849 rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
850 if (!rs->dev[i].rdev.sb_page) {
851 rs->ti->error = "Failed to allocate superblock page";
852 return -ENOMEM;
853 }
854 }
855
856 arg = dm_shift_arg(as);
857 if (!arg)
858 return -EINVAL;
859
860 if (!strcmp(arg, "-")) {
861 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
862 (!rs->dev[i].rdev.recovery_offset)) {
863 rs->ti->error = "Drive designated for rebuild not specified";
864 return -EINVAL;
865 }
866
867 if (rs->dev[i].meta_dev) {
868 rs->ti->error = "No data device supplied with metadata device";
869 return -EINVAL;
870 }
871
872 continue;
873 }
874
875 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
876 &rs->dev[i].data_dev);
877 if (r) {
878 rs->ti->error = "RAID device lookup failure";
879 return r;
880 }
881
882 if (rs->dev[i].meta_dev) {
883 metadata_available = 1;
884 rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
885 }
886 rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
887 list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks);
888 if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
889 rebuild++;
890 }
891
892 if (rs->journal_dev.dev)
893 list_add_tail(&rs->journal_dev.rdev.same_set, &rs->md.disks);
894
895 if (metadata_available) {
896 rs->md.external = 0;
897 rs->md.persistent = 1;
898 rs->md.major_version = 2;
899 } else if (rebuild && !rs->md.recovery_cp) {
900 /*
901 * Without metadata, we will not be able to tell if the array
902 * is in-sync or not - we must assume it is not. Therefore,
903 * it is impossible to rebuild a drive.
904 *
905 * Even if there is metadata, the on-disk information may
906 * indicate that the array is not in-sync and it will then
907 * fail at that time.
908 *
909 * User could specify 'nosync' option if desperate.
910 */
911 rs->ti->error = "Unable to rebuild drive while array is not in-sync";
912 return -EINVAL;
913 }
914
915 return 0;
916 }
917
918 /*
919 * validate_region_size
920 * @rs
921 * @region_size: region size in sectors. If 0, pick a size (4MiB default).
922 *
923 * Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
924 * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
925 *
926 * Returns: 0 on success, -EINVAL on failure.
927 */
928 static int validate_region_size(struct raid_set *rs, unsigned long region_size)
929 {
930 unsigned long min_region_size = rs->ti->len / (1 << 21);
931
932 if (rs_is_raid0(rs))
933 return 0;
934
935 if (!region_size) {
936 /*
937 * Choose a reasonable default. All figures in sectors.
938 */
939 if (min_region_size > (1 << 13)) {
940 /* If not a power of 2, make it the next power of 2 */
941 region_size = roundup_pow_of_two(min_region_size);
942 DMINFO("Choosing default region size of %lu sectors",
943 region_size);
944 } else {
945 DMINFO("Choosing default region size of 4MiB");
946 region_size = 1 << 13; /* sectors */
947 }
948 } else {
949 /*
950 * Validate user-supplied value.
951 */
952 if (region_size > rs->ti->len) {
953 rs->ti->error = "Supplied region size is too large";
954 return -EINVAL;
955 }
956
957 if (region_size < min_region_size) {
958 DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
959 region_size, min_region_size);
960 rs->ti->error = "Supplied region size is too small";
961 return -EINVAL;
962 }
963
964 if (!is_power_of_2(region_size)) {
965 rs->ti->error = "Region size is not a power of 2";
966 return -EINVAL;
967 }
968
969 if (region_size < rs->md.chunk_sectors) {
970 rs->ti->error = "Region size is smaller than the chunk size";
971 return -EINVAL;
972 }
973 }
974
975 /*
976 * Convert sectors to bytes.
977 */
978 rs->md.bitmap_info.chunksize = to_bytes(region_size);
979
980 return 0;
981 }
982
983 /*
984 * validate_raid_redundancy
985 * @rs
986 *
987 * Determine if there are enough devices in the array that haven't
988 * failed (or are being rebuilt) to form a usable array.
989 *
990 * Returns: 0 on success, -EINVAL on failure.
991 */
992 static int validate_raid_redundancy(struct raid_set *rs)
993 {
994 unsigned int i, rebuild_cnt = 0;
995 unsigned int rebuilds_per_group = 0, copies;
996 unsigned int group_size, last_group_start;
997
998 for (i = 0; i < rs->md.raid_disks; i++)
999 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) ||
1000 !rs->dev[i].rdev.sb_page)
1001 rebuild_cnt++;
1002
1003 switch (rs->raid_type->level) {
1004 case 0:
1005 break;
1006 case 1:
1007 if (rebuild_cnt >= rs->md.raid_disks)
1008 goto too_many;
1009 break;
1010 case 4:
1011 case 5:
1012 case 6:
1013 if (rebuild_cnt > rs->raid_type->parity_devs)
1014 goto too_many;
1015 break;
1016 case 10:
1017 copies = raid10_md_layout_to_copies(rs->md.new_layout);
1018 if (rebuild_cnt < copies)
1019 break;
1020
1021 /*
1022 * It is possible to have a higher rebuild count for RAID10,
1023 * as long as the failed devices occur in different mirror
1024 * groups (i.e. different stripes).
1025 *
1026 * When checking "near" format, make sure no adjacent devices
1027 * have failed beyond what can be handled. In addition to the
1028 * simple case where the number of devices is a multiple of the
1029 * number of copies, we must also handle cases where the number
1030 * of devices is not a multiple of the number of copies.
1031 * E.g. dev1 dev2 dev3 dev4 dev5
1032 * A A B B C
1033 * C D D E E
1034 */
1035 if (__is_raid10_near(rs->md.new_layout)) {
1036 for (i = 0; i < rs->md.raid_disks; i++) {
1037 if (!(i % copies))
1038 rebuilds_per_group = 0;
1039 if ((!rs->dev[i].rdev.sb_page ||
1040 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
1041 (++rebuilds_per_group >= copies))
1042 goto too_many;
1043 }
1044 break;
1045 }
1046
1047 /*
1048 * When checking "far" and "offset" formats, we need to ensure
1049 * that the device that holds its copy is not also dead or
1050 * being rebuilt. (Note that "far" and "offset" formats only
1051 * support two copies right now. These formats also only ever
1052 * use the 'use_far_sets' variant.)
1053 *
1054 * This check is somewhat complicated by the need to account
1055 * for arrays that are not a multiple of (far) copies. This
1056 * results in the need to treat the last (potentially larger)
1057 * set differently.
1058 */
1059 group_size = (rs->md.raid_disks / copies);
1060 last_group_start = (rs->md.raid_disks / group_size) - 1;
1061 last_group_start *= group_size;
1062 for (i = 0; i < rs->md.raid_disks; i++) {
1063 if (!(i % copies) && !(i > last_group_start))
1064 rebuilds_per_group = 0;
1065 if ((!rs->dev[i].rdev.sb_page ||
1066 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
1067 (++rebuilds_per_group >= copies))
1068 goto too_many;
1069 }
1070 break;
1071 default:
1072 if (rebuild_cnt)
1073 return -EINVAL;
1074 }
1075
1076 return 0;
1077
1078 too_many:
1079 return -EINVAL;
1080 }
1081
1082 /*
1083 * Possible arguments are...
1084 * <chunk_size> [optional_args]
1085 *
1086 * Argument definitions
1087 * <chunk_size> The number of sectors per disk that
1088 * will form the "stripe"
1089 * [[no]sync] Force or prevent recovery of the
1090 * entire array
1091 * [rebuild <idx>] Rebuild the drive indicated by the index
1092 * [daemon_sleep <ms>] Time between bitmap daemon work to
1093 * clear bits
1094 * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1095 * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1096 * [write_mostly <idx>] Indicate a write mostly drive via index
1097 * [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
1098 * [stripe_cache <sectors>] Stripe cache size for higher RAIDs
1099 * [region_size <sectors>] Defines granularity of bitmap
1100 * [journal_dev <dev>] raid4/5/6 journaling deviice
1101 * (i.e. write hole closing log)
1102 *
1103 * RAID10-only options:
1104 * [raid10_copies <# copies>] Number of copies. (Default: 2)
1105 * [raid10_format <near|far|offset>] Layout algorithm. (Default: near)
1106 */
1107 static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
1108 unsigned int num_raid_params)
1109 {
1110 int value, raid10_format = ALGORITHM_RAID10_DEFAULT;
1111 unsigned int raid10_copies = 2;
1112 unsigned int i, write_mostly = 0;
1113 unsigned int region_size = 0;
1114 sector_t max_io_len;
1115 const char *arg, *key;
1116 struct raid_dev *rd;
1117 struct raid_type *rt = rs->raid_type;
1118
1119 arg = dm_shift_arg(as);
1120 num_raid_params--; /* Account for chunk_size argument */
1121
1122 if (kstrtoint(arg, 10, &value) < 0) {
1123 rs->ti->error = "Bad numerical argument given for chunk_size";
1124 return -EINVAL;
1125 }
1126
1127 /*
1128 * First, parse the in-order required arguments
1129 * "chunk_size" is the only argument of this type.
1130 */
1131 if (rt_is_raid1(rt)) {
1132 if (value)
1133 DMERR("Ignoring chunk size parameter for RAID 1");
1134 value = 0;
1135 } else if (!is_power_of_2(value)) {
1136 rs->ti->error = "Chunk size must be a power of 2";
1137 return -EINVAL;
1138 } else if (value < 8) {
1139 rs->ti->error = "Chunk size value is too small";
1140 return -EINVAL;
1141 }
1142
1143 rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
1144
1145 /*
1146 * We set each individual device as In_sync with a completed
1147 * 'recovery_offset'. If there has been a device failure or
1148 * replacement then one of the following cases applies:
1149 *
1150 * 1) User specifies 'rebuild'.
1151 * - Device is reset when param is read.
1152 * 2) A new device is supplied.
1153 * - No matching superblock found, resets device.
1154 * 3) Device failure was transient and returns on reload.
1155 * - Failure noticed, resets device for bitmap replay.
1156 * 4) Device hadn't completed recovery after previous failure.
1157 * - Superblock is read and overrides recovery_offset.
1158 *
1159 * What is found in the superblocks of the devices is always
1160 * authoritative, unless 'rebuild' or '[no]sync' was specified.
1161 */
1162 for (i = 0; i < rs->raid_disks; i++) {
1163 set_bit(In_sync, &rs->dev[i].rdev.flags);
1164 rs->dev[i].rdev.recovery_offset = MaxSector;
1165 }
1166
1167 /*
1168 * Second, parse the unordered optional arguments
1169 */
1170 for (i = 0; i < num_raid_params; i++) {
1171 key = dm_shift_arg(as);
1172 if (!key) {
1173 rs->ti->error = "Not enough raid parameters given";
1174 return -EINVAL;
1175 }
1176
1177 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) {
1178 if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1179 rs->ti->error = "Only one 'nosync' argument allowed";
1180 return -EINVAL;
1181 }
1182 continue;
1183 }
1184 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) {
1185 if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) {
1186 rs->ti->error = "Only one 'sync' argument allowed";
1187 return -EINVAL;
1188 }
1189 continue;
1190 }
1191 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) {
1192 if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
1193 rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed";
1194 return -EINVAL;
1195 }
1196 continue;
1197 }
1198
1199 arg = dm_shift_arg(as);
1200 i++; /* Account for the argument pairs */
1201 if (!arg) {
1202 rs->ti->error = "Wrong number of raid parameters given";
1203 return -EINVAL;
1204 }
1205
1206 /*
1207 * Parameters that take a string value are checked here.
1208 */
1209 /* "raid10_format {near|offset|far} */
1210 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) {
1211 if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) {
1212 rs->ti->error = "Only one 'raid10_format' argument pair allowed";
1213 return -EINVAL;
1214 }
1215 if (!rt_is_raid10(rt)) {
1216 rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type";
1217 return -EINVAL;
1218 }
1219 raid10_format = raid10_name_to_format(arg);
1220 if (raid10_format < 0) {
1221 rs->ti->error = "Invalid 'raid10_format' value given";
1222 return raid10_format;
1223 }
1224 continue;
1225 }
1226
1227 /* "journal_dev <dev>" */
1228 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV))) {
1229 int r;
1230 struct md_rdev *jdev;
1231
1232 if (test_and_set_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
1233 rs->ti->error = "Only one raid4/5/6 set journaling device allowed";
1234 return -EINVAL;
1235 }
1236 if (!rt_is_raid456(rt)) {
1237 rs->ti->error = "'journal_dev' is an invalid parameter for this RAID type";
1238 return -EINVAL;
1239 }
1240 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
1241 &rs->journal_dev.dev);
1242 if (r) {
1243 rs->ti->error = "raid4/5/6 journal device lookup failure";
1244 return r;
1245 }
1246 jdev = &rs->journal_dev.rdev;
1247 md_rdev_init(jdev);
1248 jdev->mddev = &rs->md;
1249 jdev->bdev = rs->journal_dev.dev->bdev;
1250 jdev->sectors = to_sector(i_size_read(jdev->bdev->bd_inode));
1251 if (jdev->sectors < MIN_RAID456_JOURNAL_SPACE) {
1252 rs->ti->error = "No space for raid4/5/6 journal";
1253 return -ENOSPC;
1254 }
1255 rs->journal_dev.mode = R5C_JOURNAL_MODE_WRITE_THROUGH;
1256 set_bit(Journal, &jdev->flags);
1257 continue;
1258 }
1259
1260 /* "journal_mode <mode>" ("journal_dev" mandatory!) */
1261 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE))) {
1262 int r;
1263
1264 if (!test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
1265 rs->ti->error = "raid4/5/6 'journal_mode' is invalid without 'journal_dev'";
1266 return -EINVAL;
1267 }
1268 if (test_and_set_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
1269 rs->ti->error = "Only one raid4/5/6 'journal_mode' argument allowed";
1270 return -EINVAL;
1271 }
1272 r = dm_raid_journal_mode_to_md(arg);
1273 if (r < 0) {
1274 rs->ti->error = "Invalid 'journal_mode' argument";
1275 return r;
1276 }
1277 rs->journal_dev.mode = r;
1278 continue;
1279 }
1280
1281 /*
1282 * Parameters with number values from here on.
1283 */
1284 if (kstrtoint(arg, 10, &value) < 0) {
1285 rs->ti->error = "Bad numerical argument given in raid params";
1286 return -EINVAL;
1287 }
1288
1289 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) {
1290 /*
1291 * "rebuild" is being passed in by userspace to provide
1292 * indexes of replaced devices and to set up additional
1293 * devices on raid level takeover.
1294 */
1295 if (!__within_range(value, 0, rs->raid_disks - 1)) {
1296 rs->ti->error = "Invalid rebuild index given";
1297 return -EINVAL;
1298 }
1299
1300 if (test_and_set_bit(value, (void *) rs->rebuild_disks)) {
1301 rs->ti->error = "rebuild for this index already given";
1302 return -EINVAL;
1303 }
1304
1305 rd = rs->dev + value;
1306 clear_bit(In_sync, &rd->rdev.flags);
1307 clear_bit(Faulty, &rd->rdev.flags);
1308 rd->rdev.recovery_offset = 0;
1309 set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags);
1310 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) {
1311 if (!rt_is_raid1(rt)) {
1312 rs->ti->error = "write_mostly option is only valid for RAID1";
1313 return -EINVAL;
1314 }
1315
1316 if (!__within_range(value, 0, rs->md.raid_disks - 1)) {
1317 rs->ti->error = "Invalid write_mostly index given";
1318 return -EINVAL;
1319 }
1320
1321 write_mostly++;
1322 set_bit(WriteMostly, &rs->dev[value].rdev.flags);
1323 set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags);
1324 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) {
1325 if (!rt_is_raid1(rt)) {
1326 rs->ti->error = "max_write_behind option is only valid for RAID1";
1327 return -EINVAL;
1328 }
1329
1330 if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) {
1331 rs->ti->error = "Only one max_write_behind argument pair allowed";
1332 return -EINVAL;
1333 }
1334
1335 /*
1336 * In device-mapper, we specify things in sectors, but
1337 * MD records this value in kB
1338 */
1339 value /= 2;
1340 if (value > COUNTER_MAX) {
1341 rs->ti->error = "Max write-behind limit out of range";
1342 return -EINVAL;
1343 }
1344
1345 rs->md.bitmap_info.max_write_behind = value;
1346 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) {
1347 if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) {
1348 rs->ti->error = "Only one daemon_sleep argument pair allowed";
1349 return -EINVAL;
1350 }
1351 if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
1352 rs->ti->error = "daemon sleep period out of range";
1353 return -EINVAL;
1354 }
1355 rs->md.bitmap_info.daemon_sleep = value;
1356 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) {
1357 /* Userspace passes new data_offset after having extended the the data image LV */
1358 if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
1359 rs->ti->error = "Only one data_offset argument pair allowed";
1360 return -EINVAL;
1361 }
1362 /* Ensure sensible data offset */
1363 if (value < 0 ||
1364 (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) {
1365 rs->ti->error = "Bogus data_offset value";
1366 return -EINVAL;
1367 }
1368 rs->data_offset = value;
1369 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) {
1370 /* Define the +/-# of disks to add to/remove from the given raid set */
1371 if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
1372 rs->ti->error = "Only one delta_disks argument pair allowed";
1373 return -EINVAL;
1374 }
1375 /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */
1376 if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) {
1377 rs->ti->error = "Too many delta_disk requested";
1378 return -EINVAL;
1379 }
1380
1381 rs->delta_disks = value;
1382 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) {
1383 if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) {
1384 rs->ti->error = "Only one stripe_cache argument pair allowed";
1385 return -EINVAL;
1386 }
1387
1388 if (!rt_is_raid456(rt)) {
1389 rs->ti->error = "Inappropriate argument: stripe_cache";
1390 return -EINVAL;
1391 }
1392
1393 rs->stripe_cache_entries = value;
1394 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) {
1395 if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
1396 rs->ti->error = "Only one min_recovery_rate argument pair allowed";
1397 return -EINVAL;
1398 }
1399 if (value > INT_MAX) {
1400 rs->ti->error = "min_recovery_rate out of range";
1401 return -EINVAL;
1402 }
1403 rs->md.sync_speed_min = (int)value;
1404 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) {
1405 if (test_and_set_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) {
1406 rs->ti->error = "Only one max_recovery_rate argument pair allowed";
1407 return -EINVAL;
1408 }
1409 if (value > INT_MAX) {
1410 rs->ti->error = "max_recovery_rate out of range";
1411 return -EINVAL;
1412 }
1413 rs->md.sync_speed_max = (int)value;
1414 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) {
1415 if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) {
1416 rs->ti->error = "Only one region_size argument pair allowed";
1417 return -EINVAL;
1418 }
1419
1420 region_size = value;
1421 rs->requested_bitmap_chunk_sectors = value;
1422 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) {
1423 if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) {
1424 rs->ti->error = "Only one raid10_copies argument pair allowed";
1425 return -EINVAL;
1426 }
1427
1428 if (!__within_range(value, 2, rs->md.raid_disks)) {
1429 rs->ti->error = "Bad value for 'raid10_copies'";
1430 return -EINVAL;
1431 }
1432
1433 raid10_copies = value;
1434 } else {
1435 DMERR("Unable to parse RAID parameter: %s", key);
1436 rs->ti->error = "Unable to parse RAID parameter";
1437 return -EINVAL;
1438 }
1439 }
1440
1441 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) &&
1442 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1443 rs->ti->error = "sync and nosync are mutually exclusive";
1444 return -EINVAL;
1445 }
1446
1447 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) &&
1448 (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ||
1449 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))) {
1450 rs->ti->error = "sync/nosync and rebuild are mutually exclusive";
1451 return -EINVAL;
1452 }
1453
1454 if (write_mostly >= rs->md.raid_disks) {
1455 rs->ti->error = "Can't set all raid1 devices to write_mostly";
1456 return -EINVAL;
1457 }
1458
1459 if (validate_region_size(rs, region_size))
1460 return -EINVAL;
1461
1462 if (rs->md.chunk_sectors)
1463 max_io_len = rs->md.chunk_sectors;
1464 else
1465 max_io_len = region_size;
1466
1467 if (dm_set_target_max_io_len(rs->ti, max_io_len))
1468 return -EINVAL;
1469
1470 if (rt_is_raid10(rt)) {
1471 if (raid10_copies > rs->md.raid_disks) {
1472 rs->ti->error = "Not enough devices to satisfy specification";
1473 return -EINVAL;
1474 }
1475
1476 rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies);
1477 if (rs->md.new_layout < 0) {
1478 rs->ti->error = "Error getting raid10 format";
1479 return rs->md.new_layout;
1480 }
1481
1482 rt = get_raid_type_by_ll(10, rs->md.new_layout);
1483 if (!rt) {
1484 rs->ti->error = "Failed to recognize new raid10 layout";
1485 return -EINVAL;
1486 }
1487
1488 if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT ||
1489 rt->algorithm == ALGORITHM_RAID10_NEAR) &&
1490 test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
1491 rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible";
1492 return -EINVAL;
1493 }
1494 }
1495
1496 rs->raid10_copies = raid10_copies;
1497
1498 /* Assume there are no metadata devices until the drives are parsed */
1499 rs->md.persistent = 0;
1500 rs->md.external = 1;
1501
1502 /* Check, if any invalid ctr arguments have been passed in for the raid level */
1503 return rs_check_for_valid_flags(rs);
1504 }
1505
1506 /* Set raid4/5/6 cache size */
1507 static int rs_set_raid456_stripe_cache(struct raid_set *rs)
1508 {
1509 int r;
1510 struct r5conf *conf;
1511 struct mddev *mddev = &rs->md;
1512 uint32_t min_stripes = max(mddev->chunk_sectors, mddev->new_chunk_sectors) / 2;
1513 uint32_t nr_stripes = rs->stripe_cache_entries;
1514
1515 if (!rt_is_raid456(rs->raid_type)) {
1516 rs->ti->error = "Inappropriate raid level; cannot change stripe_cache size";
1517 return -EINVAL;
1518 }
1519
1520 if (nr_stripes < min_stripes) {
1521 DMINFO("Adjusting requested %u stripe cache entries to %u to suit stripe size",
1522 nr_stripes, min_stripes);
1523 nr_stripes = min_stripes;
1524 }
1525
1526 conf = mddev->private;
1527 if (!conf) {
1528 rs->ti->error = "Cannot change stripe_cache size on inactive RAID set";
1529 return -EINVAL;
1530 }
1531
1532 /* Try setting number of stripes in raid456 stripe cache */
1533 if (conf->min_nr_stripes != nr_stripes) {
1534 r = raid5_set_cache_size(mddev, nr_stripes);
1535 if (r) {
1536 rs->ti->error = "Failed to set raid4/5/6 stripe cache size";
1537 return r;
1538 }
1539
1540 DMINFO("%u stripe cache entries", nr_stripes);
1541 }
1542
1543 return 0;
1544 }
1545
1546 /* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */
1547 static unsigned int mddev_data_stripes(struct raid_set *rs)
1548 {
1549 return rs->md.raid_disks - rs->raid_type->parity_devs;
1550 }
1551
1552 /* Return # of data stripes of @rs (i.e. as of ctr) */
1553 static unsigned int rs_data_stripes(struct raid_set *rs)
1554 {
1555 return rs->raid_disks - rs->raid_type->parity_devs;
1556 }
1557
1558 /*
1559 * Retrieve rdev->sectors from any valid raid device of @rs
1560 * to allow userpace to pass in arbitray "- -" device tupples.
1561 */
1562 static sector_t __rdev_sectors(struct raid_set *rs)
1563 {
1564 int i;
1565
1566 for (i = 0; i < rs->md.raid_disks; i++) {
1567 struct md_rdev *rdev = &rs->dev[i].rdev;
1568
1569 if (!test_bit(Journal, &rdev->flags) &&
1570 rdev->bdev && rdev->sectors)
1571 return rdev->sectors;
1572 }
1573
1574 BUG(); /* Constructor ensures we got some. */
1575 }
1576
1577 /* Calculate the sectors per device and per array used for @rs */
1578 static int rs_set_dev_and_array_sectors(struct raid_set *rs, bool use_mddev)
1579 {
1580 int delta_disks;
1581 unsigned int data_stripes;
1582 struct mddev *mddev = &rs->md;
1583 struct md_rdev *rdev;
1584 sector_t array_sectors = rs->ti->len, dev_sectors = rs->ti->len;
1585
1586 if (use_mddev) {
1587 delta_disks = mddev->delta_disks;
1588 data_stripes = mddev_data_stripes(rs);
1589 } else {
1590 delta_disks = rs->delta_disks;
1591 data_stripes = rs_data_stripes(rs);
1592 }
1593
1594 /* Special raid1 case w/o delta_disks support (yet) */
1595 if (rt_is_raid1(rs->raid_type))
1596 ;
1597 else if (rt_is_raid10(rs->raid_type)) {
1598 if (rs->raid10_copies < 2 ||
1599 delta_disks < 0) {
1600 rs->ti->error = "Bogus raid10 data copies or delta disks";
1601 return -EINVAL;
1602 }
1603
1604 dev_sectors *= rs->raid10_copies;
1605 if (sector_div(dev_sectors, data_stripes))
1606 goto bad;
1607
1608 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1609 if (sector_div(array_sectors, rs->raid10_copies))
1610 goto bad;
1611
1612 } else if (sector_div(dev_sectors, data_stripes))
1613 goto bad;
1614
1615 else
1616 /* Striped layouts */
1617 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1618
1619 rdev_for_each(rdev, mddev)
1620 if (!test_bit(Journal, &rdev->flags))
1621 rdev->sectors = dev_sectors;
1622
1623 mddev->array_sectors = array_sectors;
1624 mddev->dev_sectors = dev_sectors;
1625
1626 return 0;
1627 bad:
1628 rs->ti->error = "Target length not divisible by number of data devices";
1629 return -EINVAL;
1630 }
1631
1632 /* Setup recovery on @rs */
1633 static void __rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors)
1634 {
1635 /* raid0 does not recover */
1636 if (rs_is_raid0(rs))
1637 rs->md.recovery_cp = MaxSector;
1638 /*
1639 * A raid6 set has to be recovered either
1640 * completely or for the grown part to
1641 * ensure proper parity and Q-Syndrome
1642 */
1643 else if (rs_is_raid6(rs))
1644 rs->md.recovery_cp = dev_sectors;
1645 /*
1646 * Other raid set types may skip recovery
1647 * depending on the 'nosync' flag.
1648 */
1649 else
1650 rs->md.recovery_cp = test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)
1651 ? MaxSector : dev_sectors;
1652 }
1653
1654 /* Setup recovery on @rs based on raid type, device size and 'nosync' flag */
1655 static void rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors)
1656 {
1657 if (!dev_sectors)
1658 /* New raid set or 'sync' flag provided */
1659 __rs_setup_recovery(rs, 0);
1660 else if (dev_sectors == MaxSector)
1661 /* Prevent recovery */
1662 __rs_setup_recovery(rs, MaxSector);
1663 else if (__rdev_sectors(rs) < dev_sectors)
1664 /* Grown raid set */
1665 __rs_setup_recovery(rs, __rdev_sectors(rs));
1666 else
1667 __rs_setup_recovery(rs, MaxSector);
1668 }
1669
1670 static void do_table_event(struct work_struct *ws)
1671 {
1672 struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
1673
1674 smp_rmb(); /* Make sure we access most actual mddev properties */
1675 if (!rs_is_reshaping(rs))
1676 rs_set_capacity(rs);
1677 dm_table_event(rs->ti->table);
1678 }
1679
1680 static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
1681 {
1682 struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
1683
1684 return mddev_congested(&rs->md, bits);
1685 }
1686
1687 /*
1688 * Make sure a valid takover (level switch) is being requested on @rs
1689 *
1690 * Conversions of raid sets from one MD personality to another
1691 * have to conform to restrictions which are enforced here.
1692 */
1693 static int rs_check_takeover(struct raid_set *rs)
1694 {
1695 struct mddev *mddev = &rs->md;
1696 unsigned int near_copies;
1697
1698 if (rs->md.degraded) {
1699 rs->ti->error = "Can't takeover degraded raid set";
1700 return -EPERM;
1701 }
1702
1703 if (rs_is_reshaping(rs)) {
1704 rs->ti->error = "Can't takeover reshaping raid set";
1705 return -EPERM;
1706 }
1707
1708 switch (mddev->level) {
1709 case 0:
1710 /* raid0 -> raid1/5 with one disk */
1711 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1712 mddev->raid_disks == 1)
1713 return 0;
1714
1715 /* raid0 -> raid10 */
1716 if (mddev->new_level == 10 &&
1717 !(rs->raid_disks % mddev->raid_disks))
1718 return 0;
1719
1720 /* raid0 with multiple disks -> raid4/5/6 */
1721 if (__within_range(mddev->new_level, 4, 6) &&
1722 mddev->new_layout == ALGORITHM_PARITY_N &&
1723 mddev->raid_disks > 1)
1724 return 0;
1725
1726 break;
1727
1728 case 10:
1729 /* Can't takeover raid10_offset! */
1730 if (__is_raid10_offset(mddev->layout))
1731 break;
1732
1733 near_copies = __raid10_near_copies(mddev->layout);
1734
1735 /* raid10* -> raid0 */
1736 if (mddev->new_level == 0) {
1737 /* Can takeover raid10_near with raid disks divisable by data copies! */
1738 if (near_copies > 1 &&
1739 !(mddev->raid_disks % near_copies)) {
1740 mddev->raid_disks /= near_copies;
1741 mddev->delta_disks = mddev->raid_disks;
1742 return 0;
1743 }
1744
1745 /* Can takeover raid10_far */
1746 if (near_copies == 1 &&
1747 __raid10_far_copies(mddev->layout) > 1)
1748 return 0;
1749
1750 break;
1751 }
1752
1753 /* raid10_{near,far} -> raid1 */
1754 if (mddev->new_level == 1 &&
1755 max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks)
1756 return 0;
1757
1758 /* raid10_{near,far} with 2 disks -> raid4/5 */
1759 if (__within_range(mddev->new_level, 4, 5) &&
1760 mddev->raid_disks == 2)
1761 return 0;
1762 break;
1763
1764 case 1:
1765 /* raid1 with 2 disks -> raid4/5 */
1766 if (__within_range(mddev->new_level, 4, 5) &&
1767 mddev->raid_disks == 2) {
1768 mddev->degraded = 1;
1769 return 0;
1770 }
1771
1772 /* raid1 -> raid0 */
1773 if (mddev->new_level == 0 &&
1774 mddev->raid_disks == 1)
1775 return 0;
1776
1777 /* raid1 -> raid10 */
1778 if (mddev->new_level == 10)
1779 return 0;
1780 break;
1781
1782 case 4:
1783 /* raid4 -> raid0 */
1784 if (mddev->new_level == 0)
1785 return 0;
1786
1787 /* raid4 -> raid1/5 with 2 disks */
1788 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1789 mddev->raid_disks == 2)
1790 return 0;
1791
1792 /* raid4 -> raid5/6 with parity N */
1793 if (__within_range(mddev->new_level, 5, 6) &&
1794 mddev->layout == ALGORITHM_PARITY_N)
1795 return 0;
1796 break;
1797
1798 case 5:
1799 /* raid5 with parity N -> raid0 */
1800 if (mddev->new_level == 0 &&
1801 mddev->layout == ALGORITHM_PARITY_N)
1802 return 0;
1803
1804 /* raid5 with parity N -> raid4 */
1805 if (mddev->new_level == 4 &&
1806 mddev->layout == ALGORITHM_PARITY_N)
1807 return 0;
1808
1809 /* raid5 with 2 disks -> raid1/4/10 */
1810 if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) &&
1811 mddev->raid_disks == 2)
1812 return 0;
1813
1814 /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */
1815 if (mddev->new_level == 6 &&
1816 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
1817 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6)))
1818 return 0;
1819 break;
1820
1821 case 6:
1822 /* raid6 with parity N -> raid0 */
1823 if (mddev->new_level == 0 &&
1824 mddev->layout == ALGORITHM_PARITY_N)
1825 return 0;
1826
1827 /* raid6 with parity N -> raid4 */
1828 if (mddev->new_level == 4 &&
1829 mddev->layout == ALGORITHM_PARITY_N)
1830 return 0;
1831
1832 /* raid6_*_n with Q-Syndrome N -> raid5_* */
1833 if (mddev->new_level == 5 &&
1834 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
1835 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC)))
1836 return 0;
1837
1838 default:
1839 break;
1840 }
1841
1842 rs->ti->error = "takeover not possible";
1843 return -EINVAL;
1844 }
1845
1846 /* True if @rs requested to be taken over */
1847 static bool rs_takeover_requested(struct raid_set *rs)
1848 {
1849 return rs->md.new_level != rs->md.level;
1850 }
1851
1852 /* True if @rs is requested to reshape by ctr */
1853 static bool rs_reshape_requested(struct raid_set *rs)
1854 {
1855 bool change;
1856 struct mddev *mddev = &rs->md;
1857
1858 if (rs_takeover_requested(rs))
1859 return false;
1860
1861 if (!mddev->level)
1862 return false;
1863
1864 change = mddev->new_layout != mddev->layout ||
1865 mddev->new_chunk_sectors != mddev->chunk_sectors ||
1866 rs->delta_disks;
1867
1868 /* Historical case to support raid1 reshape without delta disks */
1869 if (mddev->level == 1) {
1870 if (rs->delta_disks)
1871 return !!rs->delta_disks;
1872
1873 return !change &&
1874 mddev->raid_disks != rs->raid_disks;
1875 }
1876
1877 if (mddev->level == 10)
1878 return change &&
1879 !__is_raid10_far(mddev->new_layout) &&
1880 rs->delta_disks >= 0;
1881
1882 return change;
1883 }
1884
1885 /* Features */
1886 #define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */
1887
1888 /* State flags for sb->flags */
1889 #define SB_FLAG_RESHAPE_ACTIVE 0x1
1890 #define SB_FLAG_RESHAPE_BACKWARDS 0x2
1891
1892 /*
1893 * This structure is never routinely used by userspace, unlike md superblocks.
1894 * Devices with this superblock should only ever be accessed via device-mapper.
1895 */
1896 #define DM_RAID_MAGIC 0x64526D44
1897 struct dm_raid_superblock {
1898 __le32 magic; /* "DmRd" */
1899 __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */
1900
1901 __le32 num_devices; /* Number of devices in this raid set. (Max 64) */
1902 __le32 array_position; /* The position of this drive in the raid set */
1903
1904 __le64 events; /* Incremented by md when superblock updated */
1905 __le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */
1906 /* indicate failures (see extension below) */
1907
1908 /*
1909 * This offset tracks the progress of the repair or replacement of
1910 * an individual drive.
1911 */
1912 __le64 disk_recovery_offset;
1913
1914 /*
1915 * This offset tracks the progress of the initial raid set
1916 * synchronisation/parity calculation.
1917 */
1918 __le64 array_resync_offset;
1919
1920 /*
1921 * raid characteristics
1922 */
1923 __le32 level;
1924 __le32 layout;
1925 __le32 stripe_sectors;
1926
1927 /********************************************************************
1928 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
1929 *
1930 * FEATURE_FLAG_SUPPORTS_V190 in the features member indicates that those exist
1931 */
1932
1933 __le32 flags; /* Flags defining array states for reshaping */
1934
1935 /*
1936 * This offset tracks the progress of a raid
1937 * set reshape in order to be able to restart it
1938 */
1939 __le64 reshape_position;
1940
1941 /*
1942 * These define the properties of the array in case of an interrupted reshape
1943 */
1944 __le32 new_level;
1945 __le32 new_layout;
1946 __le32 new_stripe_sectors;
1947 __le32 delta_disks;
1948
1949 __le64 array_sectors; /* Array size in sectors */
1950
1951 /*
1952 * Sector offsets to data on devices (reshaping).
1953 * Needed to support out of place reshaping, thus
1954 * not writing over any stripes whilst converting
1955 * them from old to new layout
1956 */
1957 __le64 data_offset;
1958 __le64 new_data_offset;
1959
1960 __le64 sectors; /* Used device size in sectors */
1961
1962 /*
1963 * Additonal Bit field of devices indicating failures to support
1964 * up to 256 devices with the 1.9.0 on-disk metadata format
1965 */
1966 __le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1];
1967
1968 __le32 incompat_features; /* Used to indicate any incompatible features */
1969
1970 /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */
1971 } __packed;
1972
1973 /*
1974 * Check for reshape constraints on raid set @rs:
1975 *
1976 * - reshape function non-existent
1977 * - degraded set
1978 * - ongoing recovery
1979 * - ongoing reshape
1980 *
1981 * Returns 0 if none or -EPERM if given constraint
1982 * and error message reference in @errmsg
1983 */
1984 static int rs_check_reshape(struct raid_set *rs)
1985 {
1986 struct mddev *mddev = &rs->md;
1987
1988 if (!mddev->pers || !mddev->pers->check_reshape)
1989 rs->ti->error = "Reshape not supported";
1990 else if (mddev->degraded)
1991 rs->ti->error = "Can't reshape degraded raid set";
1992 else if (rs_is_recovering(rs))
1993 rs->ti->error = "Convert request on recovering raid set prohibited";
1994 else if (rs_is_reshaping(rs))
1995 rs->ti->error = "raid set already reshaping!";
1996 else if (!(rs_is_raid1(rs) || rs_is_raid10(rs) || rs_is_raid456(rs)))
1997 rs->ti->error = "Reshaping only supported for raid1/4/5/6/10";
1998 else
1999 return 0;
2000
2001 return -EPERM;
2002 }
2003
2004 static int read_disk_sb(struct md_rdev *rdev, int size, bool force_reload)
2005 {
2006 BUG_ON(!rdev->sb_page);
2007
2008 if (rdev->sb_loaded && !force_reload)
2009 return 0;
2010
2011 rdev->sb_loaded = 0;
2012
2013 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) {
2014 DMERR("Failed to read superblock of device at position %d",
2015 rdev->raid_disk);
2016 md_error(rdev->mddev, rdev);
2017 set_bit(Faulty, &rdev->flags);
2018 return -EIO;
2019 }
2020
2021 rdev->sb_loaded = 1;
2022
2023 return 0;
2024 }
2025
2026 static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
2027 {
2028 failed_devices[0] = le64_to_cpu(sb->failed_devices);
2029 memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices));
2030
2031 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
2032 int i = ARRAY_SIZE(sb->extended_failed_devices);
2033
2034 while (i--)
2035 failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]);
2036 }
2037 }
2038
2039 static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
2040 {
2041 int i = ARRAY_SIZE(sb->extended_failed_devices);
2042
2043 sb->failed_devices = cpu_to_le64(failed_devices[0]);
2044 while (i--)
2045 sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]);
2046 }
2047
2048 /*
2049 * Synchronize the superblock members with the raid set properties
2050 *
2051 * All superblock data is little endian.
2052 */
2053 static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
2054 {
2055 bool update_failed_devices = false;
2056 unsigned int i;
2057 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
2058 struct dm_raid_superblock *sb;
2059 struct raid_set *rs = container_of(mddev, struct raid_set, md);
2060
2061 /* No metadata device, no superblock */
2062 if (!rdev->meta_bdev)
2063 return;
2064
2065 BUG_ON(!rdev->sb_page);
2066
2067 sb = page_address(rdev->sb_page);
2068
2069 sb_retrieve_failed_devices(sb, failed_devices);
2070
2071 for (i = 0; i < rs->raid_disks; i++)
2072 if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) {
2073 update_failed_devices = true;
2074 set_bit(i, (void *) failed_devices);
2075 }
2076
2077 if (update_failed_devices)
2078 sb_update_failed_devices(sb, failed_devices);
2079
2080 sb->magic = cpu_to_le32(DM_RAID_MAGIC);
2081 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
2082
2083 sb->num_devices = cpu_to_le32(mddev->raid_disks);
2084 sb->array_position = cpu_to_le32(rdev->raid_disk);
2085
2086 sb->events = cpu_to_le64(mddev->events);
2087
2088 sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
2089 sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
2090
2091 sb->level = cpu_to_le32(mddev->level);
2092 sb->layout = cpu_to_le32(mddev->layout);
2093 sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
2094
2095 sb->new_level = cpu_to_le32(mddev->new_level);
2096 sb->new_layout = cpu_to_le32(mddev->new_layout);
2097 sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors);
2098
2099 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2100
2101 smp_rmb(); /* Make sure we access most recent reshape position */
2102 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2103 if (le64_to_cpu(sb->reshape_position) != MaxSector) {
2104 /* Flag ongoing reshape */
2105 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE);
2106
2107 if (mddev->delta_disks < 0 || mddev->reshape_backwards)
2108 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS);
2109 } else {
2110 /* Clear reshape flags */
2111 sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS));
2112 }
2113
2114 sb->array_sectors = cpu_to_le64(mddev->array_sectors);
2115 sb->data_offset = cpu_to_le64(rdev->data_offset);
2116 sb->new_data_offset = cpu_to_le64(rdev->new_data_offset);
2117 sb->sectors = cpu_to_le64(rdev->sectors);
2118 sb->incompat_features = cpu_to_le32(0);
2119
2120 /* Zero out the rest of the payload after the size of the superblock */
2121 memset(sb + 1, 0, rdev->sb_size - sizeof(*sb));
2122 }
2123
2124 /*
2125 * super_load
2126 *
2127 * This function creates a superblock if one is not found on the device
2128 * and will decide which superblock to use if there's a choice.
2129 *
2130 * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
2131 */
2132 static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
2133 {
2134 int r;
2135 struct dm_raid_superblock *sb;
2136 struct dm_raid_superblock *refsb;
2137 uint64_t events_sb, events_refsb;
2138
2139 rdev->sb_start = 0;
2140 rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
2141 if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) {
2142 DMERR("superblock size of a logical block is no longer valid");
2143 return -EINVAL;
2144 }
2145
2146 r = read_disk_sb(rdev, rdev->sb_size, false);
2147 if (r)
2148 return r;
2149
2150 sb = page_address(rdev->sb_page);
2151
2152 /*
2153 * Two cases that we want to write new superblocks and rebuild:
2154 * 1) New device (no matching magic number)
2155 * 2) Device specified for rebuild (!In_sync w/ offset == 0)
2156 */
2157 if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
2158 (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
2159 super_sync(rdev->mddev, rdev);
2160
2161 set_bit(FirstUse, &rdev->flags);
2162 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
2163
2164 /* Force writing of superblocks to disk */
2165 set_bit(MD_SB_CHANGE_DEVS, &rdev->mddev->sb_flags);
2166
2167 /* Any superblock is better than none, choose that if given */
2168 return refdev ? 0 : 1;
2169 }
2170
2171 if (!refdev)
2172 return 1;
2173
2174 events_sb = le64_to_cpu(sb->events);
2175
2176 refsb = page_address(refdev->sb_page);
2177 events_refsb = le64_to_cpu(refsb->events);
2178
2179 return (events_sb > events_refsb) ? 1 : 0;
2180 }
2181
2182 static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
2183 {
2184 int role;
2185 unsigned int d;
2186 struct mddev *mddev = &rs->md;
2187 uint64_t events_sb;
2188 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
2189 struct dm_raid_superblock *sb;
2190 uint32_t new_devs = 0, rebuild_and_new = 0, rebuilds = 0;
2191 struct md_rdev *r;
2192 struct dm_raid_superblock *sb2;
2193
2194 sb = page_address(rdev->sb_page);
2195 events_sb = le64_to_cpu(sb->events);
2196
2197 /*
2198 * Initialise to 1 if this is a new superblock.
2199 */
2200 mddev->events = events_sb ? : 1;
2201
2202 mddev->reshape_position = MaxSector;
2203
2204 mddev->raid_disks = le32_to_cpu(sb->num_devices);
2205 mddev->level = le32_to_cpu(sb->level);
2206 mddev->layout = le32_to_cpu(sb->layout);
2207 mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors);
2208
2209 /*
2210 * Reshaping is supported, e.g. reshape_position is valid
2211 * in superblock and superblock content is authoritative.
2212 */
2213 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
2214 /* Superblock is authoritative wrt given raid set layout! */
2215 mddev->new_level = le32_to_cpu(sb->new_level);
2216 mddev->new_layout = le32_to_cpu(sb->new_layout);
2217 mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors);
2218 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
2219 mddev->array_sectors = le64_to_cpu(sb->array_sectors);
2220
2221 /* raid was reshaping and got interrupted */
2222 if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) {
2223 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
2224 DMERR("Reshape requested but raid set is still reshaping");
2225 return -EINVAL;
2226 }
2227
2228 if (mddev->delta_disks < 0 ||
2229 (!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS)))
2230 mddev->reshape_backwards = 1;
2231 else
2232 mddev->reshape_backwards = 0;
2233
2234 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
2235 rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout);
2236 }
2237
2238 } else {
2239 /*
2240 * No takeover/reshaping, because we don't have the extended v1.9.0 metadata
2241 */
2242 struct raid_type *rt_cur = get_raid_type_by_ll(mddev->level, mddev->layout);
2243 struct raid_type *rt_new = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
2244
2245 if (rs_takeover_requested(rs)) {
2246 if (rt_cur && rt_new)
2247 DMERR("Takeover raid sets from %s to %s not yet supported by metadata. (raid level change)",
2248 rt_cur->name, rt_new->name);
2249 else
2250 DMERR("Takeover raid sets not yet supported by metadata. (raid level change)");
2251 return -EINVAL;
2252 } else if (rs_reshape_requested(rs)) {
2253 DMERR("Reshaping raid sets not yet supported by metadata. (raid layout change keeping level)");
2254 if (mddev->layout != mddev->new_layout) {
2255 if (rt_cur && rt_new)
2256 DMERR(" current layout %s vs new layout %s",
2257 rt_cur->name, rt_new->name);
2258 else
2259 DMERR(" current layout 0x%X vs new layout 0x%X",
2260 le32_to_cpu(sb->layout), mddev->new_layout);
2261 }
2262 if (mddev->chunk_sectors != mddev->new_chunk_sectors)
2263 DMERR(" current stripe sectors %u vs new stripe sectors %u",
2264 mddev->chunk_sectors, mddev->new_chunk_sectors);
2265 if (rs->delta_disks)
2266 DMERR(" current %u disks vs new %u disks",
2267 mddev->raid_disks, mddev->raid_disks + rs->delta_disks);
2268 if (rs_is_raid10(rs)) {
2269 DMERR(" Old layout: %s w/ %u copies",
2270 raid10_md_layout_to_format(mddev->layout),
2271 raid10_md_layout_to_copies(mddev->layout));
2272 DMERR(" New layout: %s w/ %u copies",
2273 raid10_md_layout_to_format(mddev->new_layout),
2274 raid10_md_layout_to_copies(mddev->new_layout));
2275 }
2276 return -EINVAL;
2277 }
2278
2279 DMINFO("Discovered old metadata format; upgrading to extended metadata format");
2280 }
2281
2282 if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
2283 mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
2284
2285 /*
2286 * During load, we set FirstUse if a new superblock was written.
2287 * There are two reasons we might not have a superblock:
2288 * 1) The raid set is brand new - in which case, all of the
2289 * devices must have their In_sync bit set. Also,
2290 * recovery_cp must be 0, unless forced.
2291 * 2) This is a new device being added to an old raid set
2292 * and the new device needs to be rebuilt - in which
2293 * case the In_sync bit will /not/ be set and
2294 * recovery_cp must be MaxSector.
2295 * 3) This is/are a new device(s) being added to an old
2296 * raid set during takeover to a higher raid level
2297 * to provide capacity for redundancy or during reshape
2298 * to add capacity to grow the raid set.
2299 */
2300 d = 0;
2301 rdev_for_each(r, mddev) {
2302 if (test_bit(Journal, &rdev->flags))
2303 continue;
2304
2305 if (test_bit(FirstUse, &r->flags))
2306 new_devs++;
2307
2308 if (!test_bit(In_sync, &r->flags)) {
2309 DMINFO("Device %d specified for rebuild; clearing superblock",
2310 r->raid_disk);
2311 rebuilds++;
2312
2313 if (test_bit(FirstUse, &r->flags))
2314 rebuild_and_new++;
2315 }
2316
2317 d++;
2318 }
2319
2320 if (new_devs == rs->raid_disks || !rebuilds) {
2321 /* Replace a broken device */
2322 if (new_devs == 1 && !rs->delta_disks)
2323 ;
2324 if (new_devs == rs->raid_disks) {
2325 DMINFO("Superblocks created for new raid set");
2326 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2327 } else if (new_devs != rebuilds &&
2328 new_devs != rs->delta_disks) {
2329 DMERR("New device injected into existing raid set without "
2330 "'delta_disks' or 'rebuild' parameter specified");
2331 return -EINVAL;
2332 }
2333 } else if (new_devs && new_devs != rebuilds) {
2334 DMERR("%u 'rebuild' devices cannot be injected into"
2335 " a raid set with %u other first-time devices",
2336 rebuilds, new_devs);
2337 return -EINVAL;
2338 } else if (rebuilds) {
2339 if (rebuild_and_new && rebuilds != rebuild_and_new) {
2340 DMERR("new device%s provided without 'rebuild'",
2341 new_devs > 1 ? "s" : "");
2342 return -EINVAL;
2343 } else if (rs_is_recovering(rs)) {
2344 DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)",
2345 (unsigned long long) mddev->recovery_cp);
2346 return -EINVAL;
2347 } else if (rs_is_reshaping(rs)) {
2348 DMERR("'rebuild' specified while raid set is being reshaped (reshape_position=%llu)",
2349 (unsigned long long) mddev->reshape_position);
2350 return -EINVAL;
2351 }
2352 }
2353
2354 /*
2355 * Now we set the Faulty bit for those devices that are
2356 * recorded in the superblock as failed.
2357 */
2358 sb_retrieve_failed_devices(sb, failed_devices);
2359 rdev_for_each(r, mddev) {
2360 if (test_bit(Journal, &rdev->flags) ||
2361 !r->sb_page)
2362 continue;
2363 sb2 = page_address(r->sb_page);
2364 sb2->failed_devices = 0;
2365 memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices));
2366
2367 /*
2368 * Check for any device re-ordering.
2369 */
2370 if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
2371 role = le32_to_cpu(sb2->array_position);
2372 if (role < 0)
2373 continue;
2374
2375 if (role != r->raid_disk) {
2376 if (rs_is_raid10(rs) && __is_raid10_near(mddev->layout)) {
2377 if (mddev->raid_disks % __raid10_near_copies(mddev->layout) ||
2378 rs->raid_disks % rs->raid10_copies) {
2379 rs->ti->error =
2380 "Cannot change raid10 near set to odd # of devices!";
2381 return -EINVAL;
2382 }
2383
2384 sb2->array_position = cpu_to_le32(r->raid_disk);
2385
2386 } else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) &&
2387 !(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) &&
2388 !rt_is_raid1(rs->raid_type)) {
2389 rs->ti->error = "Cannot change device positions in raid set";
2390 return -EINVAL;
2391 }
2392
2393 DMINFO("raid device #%d now at position #%d", role, r->raid_disk);
2394 }
2395
2396 /*
2397 * Partial recovery is performed on
2398 * returning failed devices.
2399 */
2400 if (test_bit(role, (void *) failed_devices))
2401 set_bit(Faulty, &r->flags);
2402 }
2403 }
2404
2405 return 0;
2406 }
2407
2408 static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
2409 {
2410 struct mddev *mddev = &rs->md;
2411 struct dm_raid_superblock *sb;
2412
2413 if (rs_is_raid0(rs) || !rdev->sb_page || rdev->raid_disk < 0)
2414 return 0;
2415
2416 sb = page_address(rdev->sb_page);
2417
2418 /*
2419 * If mddev->events is not set, we know we have not yet initialized
2420 * the array.
2421 */
2422 if (!mddev->events && super_init_validation(rs, rdev))
2423 return -EINVAL;
2424
2425 if (le32_to_cpu(sb->compat_features) &&
2426 le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
2427 rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
2428 return -EINVAL;
2429 }
2430
2431 if (sb->incompat_features) {
2432 rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet";
2433 return -EINVAL;
2434 }
2435
2436 /* Enable bitmap creation for RAID levels != 0 */
2437 mddev->bitmap_info.offset = rt_is_raid0(rs->raid_type) ? 0 : to_sector(4096);
2438 mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
2439
2440 if (!test_and_clear_bit(FirstUse, &rdev->flags)) {
2441 /* Retrieve device size stored in superblock to be prepared for shrink */
2442 rdev->sectors = le64_to_cpu(sb->sectors);
2443 rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
2444 if (rdev->recovery_offset == MaxSector)
2445 set_bit(In_sync, &rdev->flags);
2446 /*
2447 * If no reshape in progress -> we're recovering single
2448 * disk(s) and have to set the device(s) to out-of-sync
2449 */
2450 else if (!rs_is_reshaping(rs))
2451 clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */
2452 }
2453
2454 /*
2455 * If a device comes back, set it as not In_sync and no longer faulty.
2456 */
2457 if (test_and_clear_bit(Faulty, &rdev->flags)) {
2458 rdev->recovery_offset = 0;
2459 clear_bit(In_sync, &rdev->flags);
2460 rdev->saved_raid_disk = rdev->raid_disk;
2461 }
2462
2463 /* Reshape support -> restore repective data offsets */
2464 rdev->data_offset = le64_to_cpu(sb->data_offset);
2465 rdev->new_data_offset = le64_to_cpu(sb->new_data_offset);
2466
2467 return 0;
2468 }
2469
2470 /*
2471 * Analyse superblocks and select the freshest.
2472 */
2473 static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
2474 {
2475 int r;
2476 struct md_rdev *rdev, *freshest;
2477 struct mddev *mddev = &rs->md;
2478
2479 freshest = NULL;
2480 rdev_for_each(rdev, mddev) {
2481 if (test_bit(Journal, &rdev->flags))
2482 continue;
2483
2484 /*
2485 * Skipping super_load due to CTR_FLAG_SYNC will cause
2486 * the array to undergo initialization again as
2487 * though it were new. This is the intended effect
2488 * of the "sync" directive.
2489 *
2490 * With reshaping capability added, we must ensure that
2491 * that the "sync" directive is disallowed during the reshape.
2492 */
2493 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
2494 continue;
2495
2496 if (!rdev->meta_bdev)
2497 continue;
2498
2499 r = super_load(rdev, freshest);
2500
2501 switch (r) {
2502 case 1:
2503 freshest = rdev;
2504 break;
2505 case 0:
2506 break;
2507 default:
2508 /* This is a failure to read the superblock from the metadata device. */
2509 /*
2510 * We have to keep any raid0 data/metadata device pairs or
2511 * the MD raid0 personality will fail to start the array.
2512 */
2513 if (rs_is_raid0(rs))
2514 continue;
2515
2516 /*
2517 * We keep the dm_devs to be able to emit the device tuple
2518 * properly on the table line in raid_status() (rather than
2519 * mistakenly acting as if '- -' got passed into the constructor).
2520 *
2521 * The rdev has to stay on the same_set list to allow for
2522 * the attempt to restore faulty devices on second resume.
2523 */
2524 rdev->raid_disk = rdev->saved_raid_disk = -1;
2525 break;
2526 }
2527 }
2528
2529 if (!freshest)
2530 return 0;
2531
2532 if (validate_raid_redundancy(rs)) {
2533 rs->ti->error = "Insufficient redundancy to activate array";
2534 return -EINVAL;
2535 }
2536
2537 /*
2538 * Validation of the freshest device provides the source of
2539 * validation for the remaining devices.
2540 */
2541 rs->ti->error = "Unable to assemble array: Invalid superblocks";
2542 if (super_validate(rs, freshest))
2543 return -EINVAL;
2544
2545 rdev_for_each(rdev, mddev)
2546 if (!test_bit(Journal, &rdev->flags) &&
2547 rdev != freshest &&
2548 super_validate(rs, rdev))
2549 return -EINVAL;
2550 return 0;
2551 }
2552
2553 /*
2554 * Adjust data_offset and new_data_offset on all disk members of @rs
2555 * for out of place reshaping if requested by contructor
2556 *
2557 * We need free space at the beginning of each raid disk for forward
2558 * and at the end for backward reshapes which userspace has to provide
2559 * via remapping/reordering of space.
2560 */
2561 static int rs_adjust_data_offsets(struct raid_set *rs)
2562 {
2563 sector_t data_offset = 0, new_data_offset = 0;
2564 struct md_rdev *rdev;
2565
2566 /* Constructor did not request data offset change */
2567 if (!test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
2568 if (!rs_is_reshapable(rs))
2569 goto out;
2570
2571 return 0;
2572 }
2573
2574 /* HM FIXME: get InSync raid_dev? */
2575 rdev = &rs->dev[0].rdev;
2576
2577 if (rs->delta_disks < 0) {
2578 /*
2579 * Removing disks (reshaping backwards):
2580 *
2581 * - before reshape: data is at offset 0 and free space
2582 * is at end of each component LV
2583 *
2584 * - after reshape: data is at offset rs->data_offset != 0 on each component LV
2585 */
2586 data_offset = 0;
2587 new_data_offset = rs->data_offset;
2588
2589 } else if (rs->delta_disks > 0) {
2590 /*
2591 * Adding disks (reshaping forwards):
2592 *
2593 * - before reshape: data is at offset rs->data_offset != 0 and
2594 * free space is at begin of each component LV
2595 *
2596 * - after reshape: data is at offset 0 on each component LV
2597 */
2598 data_offset = rs->data_offset;
2599 new_data_offset = 0;
2600
2601 } else {
2602 /*
2603 * User space passes in 0 for data offset after having removed reshape space
2604 *
2605 * - or - (data offset != 0)
2606 *
2607 * Changing RAID layout or chunk size -> toggle offsets
2608 *
2609 * - before reshape: data is at offset rs->data_offset 0 and
2610 * free space is at end of each component LV
2611 * -or-
2612 * data is at offset rs->data_offset != 0 and
2613 * free space is at begin of each component LV
2614 *
2615 * - after reshape: data is at offset 0 if it was at offset != 0
2616 * or at offset != 0 if it was at offset 0
2617 * on each component LV
2618 *
2619 */
2620 data_offset = rs->data_offset ? rdev->data_offset : 0;
2621 new_data_offset = data_offset ? 0 : rs->data_offset;
2622 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2623 }
2624
2625 /*
2626 * Make sure we got a minimum amount of free sectors per device
2627 */
2628 if (rs->data_offset &&
2629 to_sector(i_size_read(rdev->bdev->bd_inode)) - rdev->sectors < MIN_FREE_RESHAPE_SPACE) {
2630 rs->ti->error = data_offset ? "No space for forward reshape" :
2631 "No space for backward reshape";
2632 return -ENOSPC;
2633 }
2634 out:
2635 /* Adjust data offsets on all rdevs but on any raid4/5/6 journal device */
2636 rdev_for_each(rdev, &rs->md) {
2637 if (!test_bit(Journal, &rdev->flags)) {
2638 rdev->data_offset = data_offset;
2639 rdev->new_data_offset = new_data_offset;
2640 }
2641 }
2642
2643 return 0;
2644 }
2645
2646 /* Userpace reordered disks -> adjust raid_disk indexes in @rs */
2647 static void __reorder_raid_disk_indexes(struct raid_set *rs)
2648 {
2649 int i = 0;
2650 struct md_rdev *rdev;
2651
2652 rdev_for_each(rdev, &rs->md) {
2653 if (!test_bit(Journal, &rdev->flags)) {
2654 rdev->raid_disk = i++;
2655 rdev->saved_raid_disk = rdev->new_raid_disk = -1;
2656 }
2657 }
2658 }
2659
2660 /*
2661 * Setup @rs for takeover by a different raid level
2662 */
2663 static int rs_setup_takeover(struct raid_set *rs)
2664 {
2665 struct mddev *mddev = &rs->md;
2666 struct md_rdev *rdev;
2667 unsigned int d = mddev->raid_disks = rs->raid_disks;
2668 sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset;
2669
2670 if (rt_is_raid10(rs->raid_type)) {
2671 if (mddev->level == 0) {
2672 /* Userpace reordered disks -> adjust raid_disk indexes */
2673 __reorder_raid_disk_indexes(rs);
2674
2675 /* raid0 -> raid10_far layout */
2676 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR,
2677 rs->raid10_copies);
2678 } else if (mddev->level == 1)
2679 /* raid1 -> raid10_near layout */
2680 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2681 rs->raid_disks);
2682 else
2683 return -EINVAL;
2684
2685 }
2686
2687 clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2688 mddev->recovery_cp = MaxSector;
2689
2690 while (d--) {
2691 rdev = &rs->dev[d].rdev;
2692
2693 if (test_bit(d, (void *) rs->rebuild_disks)) {
2694 clear_bit(In_sync, &rdev->flags);
2695 clear_bit(Faulty, &rdev->flags);
2696 mddev->recovery_cp = rdev->recovery_offset = 0;
2697 /* Bitmap has to be created when we do an "up" takeover */
2698 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2699 }
2700
2701 rdev->new_data_offset = new_data_offset;
2702 }
2703
2704 return 0;
2705 }
2706
2707 /* Prepare @rs for reshape */
2708 static int rs_prepare_reshape(struct raid_set *rs)
2709 {
2710 bool reshape;
2711 struct mddev *mddev = &rs->md;
2712
2713 if (rs_is_raid10(rs)) {
2714 if (rs->raid_disks != mddev->raid_disks &&
2715 __is_raid10_near(mddev->layout) &&
2716 rs->raid10_copies &&
2717 rs->raid10_copies != __raid10_near_copies(mddev->layout)) {
2718 /*
2719 * raid disk have to be multiple of data copies to allow this conversion,
2720 *
2721 * This is actually not a reshape it is a
2722 * rebuild of any additional mirrors per group
2723 */
2724 if (rs->raid_disks % rs->raid10_copies) {
2725 rs->ti->error = "Can't reshape raid10 mirror groups";
2726 return -EINVAL;
2727 }
2728
2729 /* Userpace reordered disks to add/remove mirrors -> adjust raid_disk indexes */
2730 __reorder_raid_disk_indexes(rs);
2731 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2732 rs->raid10_copies);
2733 mddev->new_layout = mddev->layout;
2734 reshape = false;
2735 } else
2736 reshape = true;
2737
2738 } else if (rs_is_raid456(rs))
2739 reshape = true;
2740
2741 else if (rs_is_raid1(rs)) {
2742 if (rs->delta_disks) {
2743 /* Process raid1 via delta_disks */
2744 mddev->degraded = rs->delta_disks < 0 ? -rs->delta_disks : rs->delta_disks;
2745 reshape = true;
2746 } else {
2747 /* Process raid1 without delta_disks */
2748 mddev->raid_disks = rs->raid_disks;
2749 reshape = false;
2750 }
2751 } else {
2752 rs->ti->error = "Called with bogus raid type";
2753 return -EINVAL;
2754 }
2755
2756 if (reshape) {
2757 set_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags);
2758 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2759 } else if (mddev->raid_disks < rs->raid_disks)
2760 /* Create new superblocks and bitmaps, if any new disks */
2761 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2762
2763 return 0;
2764 }
2765
2766 /*
2767 *
2768 * - change raid layout
2769 * - change chunk size
2770 * - add disks
2771 * - remove disks
2772 */
2773 static int rs_setup_reshape(struct raid_set *rs)
2774 {
2775 int r = 0;
2776 unsigned int cur_raid_devs, d;
2777 struct mddev *mddev = &rs->md;
2778 struct md_rdev *rdev;
2779
2780 mddev->delta_disks = rs->delta_disks;
2781 cur_raid_devs = mddev->raid_disks;
2782
2783 /* Ignore impossible layout change whilst adding/removing disks */
2784 if (mddev->delta_disks &&
2785 mddev->layout != mddev->new_layout) {
2786 DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks);
2787 mddev->new_layout = mddev->layout;
2788 }
2789
2790 /*
2791 * Adjust array size:
2792 *
2793 * - in case of adding disks, array size has
2794 * to grow after the disk adding reshape,
2795 * which'll hapen in the event handler;
2796 * reshape will happen forward, so space has to
2797 * be available at the beginning of each disk
2798 *
2799 * - in case of removing disks, array size
2800 * has to shrink before starting the reshape,
2801 * which'll happen here;
2802 * reshape will happen backward, so space has to
2803 * be available at the end of each disk
2804 *
2805 * - data_offset and new_data_offset are
2806 * adjusted for aforementioned out of place
2807 * reshaping based on userspace passing in
2808 * the "data_offset <sectors>" key/value
2809 * pair via the constructor
2810 */
2811
2812 /* Add disk(s) */
2813 if (rs->delta_disks > 0) {
2814 /* Prepare disks for check in raid4/5/6/10 {check|start}_reshape */
2815 for (d = cur_raid_devs; d < rs->raid_disks; d++) {
2816 rdev = &rs->dev[d].rdev;
2817 clear_bit(In_sync, &rdev->flags);
2818
2819 /*
2820 * save_raid_disk needs to be -1, or recovery_offset will be set to 0
2821 * by md, which'll store that erroneously in the superblock on reshape
2822 */
2823 rdev->saved_raid_disk = -1;
2824 rdev->raid_disk = d;
2825
2826 rdev->sectors = mddev->dev_sectors;
2827 rdev->recovery_offset = rs_is_raid1(rs) ? 0 : MaxSector;
2828 }
2829
2830 mddev->reshape_backwards = 0; /* adding disks -> forward reshape */
2831
2832 /* Remove disk(s) */
2833 } else if (rs->delta_disks < 0) {
2834 r = rs_set_dev_and_array_sectors(rs, true);
2835 mddev->reshape_backwards = 1; /* removing disk(s) -> backward reshape */
2836
2837 /* Change layout and/or chunk size */
2838 } else {
2839 /*
2840 * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size:
2841 *
2842 * keeping number of disks and do layout change ->
2843 *
2844 * toggle reshape_backward depending on data_offset:
2845 *
2846 * - free space upfront -> reshape forward
2847 *
2848 * - free space at the end -> reshape backward
2849 *
2850 *
2851 * This utilizes free reshape space avoiding the need
2852 * for userspace to move (parts of) LV segments in
2853 * case of layout/chunksize change (for disk
2854 * adding/removing reshape space has to be at
2855 * the proper address (see above with delta_disks):
2856 *
2857 * add disk(s) -> begin
2858 * remove disk(s)-> end
2859 */
2860 mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1;
2861 }
2862
2863 return r;
2864 }
2865
2866 /*
2867 * Enable/disable discard support on RAID set depending on
2868 * RAID level and discard properties of underlying RAID members.
2869 */
2870 static void configure_discard_support(struct raid_set *rs)
2871 {
2872 int i;
2873 bool raid456;
2874 struct dm_target *ti = rs->ti;
2875
2876 /* Assume discards not supported until after checks below. */
2877 ti->discards_supported = false;
2878
2879 /*
2880 * XXX: RAID level 4,5,6 require zeroing for safety.
2881 */
2882 raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6);
2883
2884 for (i = 0; i < rs->raid_disks; i++) {
2885 struct request_queue *q;
2886
2887 if (!rs->dev[i].rdev.bdev)
2888 continue;
2889
2890 q = bdev_get_queue(rs->dev[i].rdev.bdev);
2891 if (!q || !blk_queue_discard(q))
2892 return;
2893
2894 if (raid456) {
2895 if (!devices_handle_discard_safely) {
2896 DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
2897 DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");
2898 return;
2899 }
2900 }
2901 }
2902
2903 /* All RAID members properly support discards */
2904 ti->discards_supported = true;
2905
2906 /*
2907 * RAID1 and RAID10 personalities require bio splitting,
2908 * RAID0/4/5/6 don't and process large discard bios properly.
2909 */
2910 ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10);
2911 ti->num_discard_bios = 1;
2912 }
2913
2914 /*
2915 * Construct a RAID0/1/10/4/5/6 mapping:
2916 * Args:
2917 * <raid_type> <#raid_params> <raid_params>{0,} \
2918 * <#raid_devs> [<meta_dev1> <dev1>]{1,}
2919 *
2920 * <raid_params> varies by <raid_type>. See 'parse_raid_params' for
2921 * details on possible <raid_params>.
2922 *
2923 * Userspace is free to initialize the metadata devices, hence the superblocks to
2924 * enforce recreation based on the passed in table parameters.
2925 *
2926 */
2927 static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2928 {
2929 int r;
2930 bool resize;
2931 struct raid_type *rt;
2932 unsigned int num_raid_params, num_raid_devs;
2933 sector_t calculated_dev_sectors;
2934 struct raid_set *rs = NULL;
2935 const char *arg;
2936 struct rs_layout rs_layout;
2937 struct dm_arg_set as = { argc, argv }, as_nrd;
2938 struct dm_arg _args[] = {
2939 { 0, as.argc, "Cannot understand number of raid parameters" },
2940 { 1, 254, "Cannot understand number of raid devices parameters" }
2941 };
2942
2943 /* Must have <raid_type> */
2944 arg = dm_shift_arg(&as);
2945 if (!arg) {
2946 ti->error = "No arguments";
2947 return -EINVAL;
2948 }
2949
2950 rt = get_raid_type(arg);
2951 if (!rt) {
2952 ti->error = "Unrecognised raid_type";
2953 return -EINVAL;
2954 }
2955
2956 /* Must have <#raid_params> */
2957 if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error))
2958 return -EINVAL;
2959
2960 /* number of raid device tupples <meta_dev data_dev> */
2961 as_nrd = as;
2962 dm_consume_args(&as_nrd, num_raid_params);
2963 _args[1].max = (as_nrd.argc - 1) / 2;
2964 if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error))
2965 return -EINVAL;
2966
2967 if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) {
2968 ti->error = "Invalid number of supplied raid devices";
2969 return -EINVAL;
2970 }
2971
2972 rs = raid_set_alloc(ti, rt, num_raid_devs);
2973 if (IS_ERR(rs))
2974 return PTR_ERR(rs);
2975
2976 r = parse_raid_params(rs, &as, num_raid_params);
2977 if (r)
2978 goto bad;
2979
2980 r = parse_dev_params(rs, &as);
2981 if (r)
2982 goto bad;
2983
2984 rs->md.sync_super = super_sync;
2985
2986 /*
2987 * Calculate ctr requested array and device sizes to allow
2988 * for superblock analysis needing device sizes defined.
2989 *
2990 * Any existing superblock will overwrite the array and device sizes
2991 */
2992 r = rs_set_dev_and_array_sectors(rs, false);
2993 if (r)
2994 goto bad;
2995
2996 calculated_dev_sectors = rs->md.dev_sectors;
2997
2998 /*
2999 * Backup any new raid set level, layout, ...
3000 * requested to be able to compare to superblock
3001 * members for conversion decisions.
3002 */
3003 rs_config_backup(rs, &rs_layout);
3004
3005 r = analyse_superblocks(ti, rs);
3006 if (r)
3007 goto bad;
3008
3009 resize = calculated_dev_sectors != __rdev_sectors(rs);
3010
3011 INIT_WORK(&rs->md.event_work, do_table_event);
3012 ti->private = rs;
3013 ti->num_flush_bios = 1;
3014
3015 /* Restore any requested new layout for conversion decision */
3016 rs_config_restore(rs, &rs_layout);
3017
3018 /*
3019 * Now that we have any superblock metadata available,
3020 * check for new, recovering, reshaping, to be taken over,
3021 * to be reshaped or an existing, unchanged raid set to
3022 * run in sequence.
3023 */
3024 if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) {
3025 /* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */
3026 if (rs_is_raid6(rs) &&
3027 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
3028 ti->error = "'nosync' not allowed for new raid6 set";
3029 r = -EINVAL;
3030 goto bad;
3031 }
3032 rs_setup_recovery(rs, 0);
3033 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3034 rs_set_new(rs);
3035 } else if (rs_is_recovering(rs)) {
3036 /* A recovering raid set may be resized */
3037 ; /* skip setup rs */
3038 } else if (rs_is_reshaping(rs)) {
3039 /* Have to reject size change request during reshape */
3040 if (resize) {
3041 ti->error = "Can't resize a reshaping raid set";
3042 r = -EPERM;
3043 goto bad;
3044 }
3045 /* skip setup rs */
3046 } else if (rs_takeover_requested(rs)) {
3047 if (rs_is_reshaping(rs)) {
3048 ti->error = "Can't takeover a reshaping raid set";
3049 r = -EPERM;
3050 goto bad;
3051 }
3052
3053 /* We can't takeover a journaled raid4/5/6 */
3054 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
3055 ti->error = "Can't takeover a journaled raid4/5/6 set";
3056 r = -EPERM;
3057 goto bad;
3058 }
3059
3060 /*
3061 * If a takeover is needed, userspace sets any additional
3062 * devices to rebuild and we can check for a valid request here.
3063 *
3064 * If acceptible, set the level to the new requested
3065 * one, prohibit requesting recovery, allow the raid
3066 * set to run and store superblocks during resume.
3067 */
3068 r = rs_check_takeover(rs);
3069 if (r)
3070 goto bad;
3071
3072 r = rs_setup_takeover(rs);
3073 if (r)
3074 goto bad;
3075
3076 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3077 /* Takeover ain't recovery, so disable recovery */
3078 rs_setup_recovery(rs, MaxSector);
3079 rs_set_new(rs);
3080 } else if (rs_reshape_requested(rs)) {
3081 /*
3082 * No need to check for 'ongoing' takeover here, because takeover
3083 * is an instant operation as oposed to an ongoing reshape.
3084 */
3085
3086 /* We can't reshape a journaled raid4/5/6 */
3087 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
3088 ti->error = "Can't reshape a journaled raid4/5/6 set";
3089 r = -EPERM;
3090 goto bad;
3091 }
3092
3093 /*
3094 * We can only prepare for a reshape here, because the
3095 * raid set needs to run to provide the repective reshape
3096 * check functions via its MD personality instance.
3097 *
3098 * So do the reshape check after md_run() succeeded.
3099 */
3100 r = rs_prepare_reshape(rs);
3101 if (r)
3102 return r;
3103
3104 /* Reshaping ain't recovery, so disable recovery */
3105 rs_setup_recovery(rs, MaxSector);
3106 rs_set_cur(rs);
3107 } else {
3108 /* May not set recovery when a device rebuild is requested */
3109 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) {
3110 rs_setup_recovery(rs, MaxSector);
3111 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3112 } else
3113 rs_setup_recovery(rs, test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ?
3114 0 : (resize ? calculated_dev_sectors : MaxSector));
3115 rs_set_cur(rs);
3116 }
3117
3118 /* If constructor requested it, change data and new_data offsets */
3119 r = rs_adjust_data_offsets(rs);
3120 if (r)
3121 goto bad;
3122
3123 /* Start raid set read-only and assumed clean to change in raid_resume() */
3124 rs->md.ro = 1;
3125 rs->md.in_sync = 1;
3126 set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
3127
3128 /* Has to be held on running the array */
3129 mddev_lock_nointr(&rs->md);
3130 r = md_run(&rs->md);
3131 rs->md.in_sync = 0; /* Assume already marked dirty */
3132
3133 if (r) {
3134 ti->error = "Failed to run raid array";
3135 mddev_unlock(&rs->md);
3136 goto bad;
3137 }
3138
3139 rs->callbacks.congested_fn = raid_is_congested;
3140 dm_table_add_target_callbacks(ti->table, &rs->callbacks);
3141
3142 /* If raid4/5/6 journal mode explictely requested (only possible with journal dev) -> set it */
3143 if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
3144 r = r5c_journal_mode_set(&rs->md, rs->journal_dev.mode);
3145 if (r) {
3146 ti->error = "Failed to set raid4/5/6 journal mode";
3147 mddev_unlock(&rs->md);
3148 goto bad_journal_mode_set;
3149 }
3150 }
3151
3152 mddev_suspend(&rs->md);
3153
3154 /* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
3155 if (rs_is_raid456(rs)) {
3156 r = rs_set_raid456_stripe_cache(rs);
3157 if (r)
3158 goto bad_stripe_cache;
3159 }
3160
3161 /* Now do an early reshape check */
3162 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
3163 r = rs_check_reshape(rs);
3164 if (r)
3165 goto bad_check_reshape;
3166
3167 /* Restore new, ctr requested layout to perform check */
3168 rs_config_restore(rs, &rs_layout);
3169
3170 if (rs->md.pers->start_reshape) {
3171 r = rs->md.pers->check_reshape(&rs->md);
3172 if (r) {
3173 ti->error = "Reshape check failed";
3174 goto bad_check_reshape;
3175 }
3176 }
3177 }
3178
3179 /* Disable/enable discard support on raid set. */
3180 configure_discard_support(rs);
3181
3182 mddev_unlock(&rs->md);
3183 return 0;
3184
3185 bad_journal_mode_set:
3186 bad_stripe_cache:
3187 bad_check_reshape:
3188 md_stop(&rs->md);
3189 bad:
3190 raid_set_free(rs);
3191
3192 return r;
3193 }
3194
3195 static void raid_dtr(struct dm_target *ti)
3196 {
3197 struct raid_set *rs = ti->private;
3198
3199 list_del_init(&rs->callbacks.list);
3200 md_stop(&rs->md);
3201 raid_set_free(rs);
3202 }
3203
3204 static int raid_map(struct dm_target *ti, struct bio *bio)
3205 {
3206 struct raid_set *rs = ti->private;
3207 struct mddev *mddev = &rs->md;
3208
3209 /*
3210 * If we're reshaping to add disk(s)), ti->len and
3211 * mddev->array_sectors will differ during the process
3212 * (ti->len > mddev->array_sectors), so we have to requeue
3213 * bios with addresses > mddev->array_sectors here or
3214 * there will occur accesses past EOD of the component
3215 * data images thus erroring the raid set.
3216 */
3217 if (unlikely(bio_end_sector(bio) > mddev->array_sectors))
3218 return DM_MAPIO_REQUEUE;
3219
3220 mddev->pers->make_request(mddev, bio);
3221
3222 return DM_MAPIO_SUBMITTED;
3223 }
3224
3225 /* Return string describing the current sync action of @mddev */
3226 static const char *decipher_sync_action(struct mddev *mddev)
3227 {
3228 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3229 return "frozen";
3230
3231 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3232 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3233 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3234 return "reshape";
3235
3236 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3237 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3238 return "resync";
3239 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3240 return "check";
3241 return "repair";
3242 }
3243
3244 if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3245 return "recover";
3246 }
3247
3248 return "idle";
3249 }
3250
3251 /*
3252 * Return status string for @rdev
3253 *
3254 * Status characters:
3255 *
3256 * 'D' = Dead/Failed raid set component or raid4/5/6 journal device
3257 * 'a' = Alive but not in-sync raid set component _or_ alive raid4/5/6 'write_back' journal device
3258 * 'A' = Alive and in-sync raid set component _or_ alive raid4/5/6 'write_through' journal device
3259 * '-' = Non-existing device (i.e. uspace passed '- -' into the ctr)
3260 */
3261 static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev, bool array_in_sync)
3262 {
3263 if (!rdev->bdev)
3264 return "-";
3265 else if (test_bit(Faulty, &rdev->flags))
3266 return "D";
3267 else if (test_bit(Journal, &rdev->flags))
3268 return (rs->journal_dev.mode == R5C_JOURNAL_MODE_WRITE_THROUGH) ? "A" : "a";
3269 else if (!array_in_sync || !test_bit(In_sync, &rdev->flags))
3270 return "a";
3271 else
3272 return "A";
3273 }
3274
3275 /* Helper to return resync/reshape progress for @rs and @array_in_sync */
3276 static sector_t rs_get_progress(struct raid_set *rs,
3277 sector_t resync_max_sectors, bool *array_in_sync)
3278 {
3279 sector_t r, recovery_cp, curr_resync_completed;
3280 struct mddev *mddev = &rs->md;
3281
3282 curr_resync_completed = mddev->curr_resync_completed ?: mddev->recovery_cp;
3283 recovery_cp = mddev->recovery_cp;
3284 *array_in_sync = false;
3285
3286 if (rs_is_raid0(rs)) {
3287 r = resync_max_sectors;
3288 *array_in_sync = true;
3289
3290 } else {
3291 r = mddev->reshape_position;
3292
3293 /* Reshape is relative to the array size */
3294 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
3295 r != MaxSector) {
3296 if (r == MaxSector) {
3297 *array_in_sync = true;
3298 r = resync_max_sectors;
3299 } else {
3300 /* Got to reverse on backward reshape */
3301 if (mddev->reshape_backwards)
3302 r = mddev->array_sectors - r;
3303
3304 /* Devide by # of data stripes */
3305 sector_div(r, mddev_data_stripes(rs));
3306 }
3307
3308 /* Sync is relative to the component device size */
3309 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3310 r = curr_resync_completed;
3311 else
3312 r = recovery_cp;
3313
3314 if (r == MaxSector) {
3315 /*
3316 * Sync complete.
3317 */
3318 *array_in_sync = true;
3319 r = resync_max_sectors;
3320 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
3321 /*
3322 * If "check" or "repair" is occurring, the raid set has
3323 * undergone an initial sync and the health characters
3324 * should not be 'a' anymore.
3325 */
3326 *array_in_sync = true;
3327 } else {
3328 struct md_rdev *rdev;
3329
3330 /*
3331 * The raid set may be doing an initial sync, or it may
3332 * be rebuilding individual components. If all the
3333 * devices are In_sync, then it is the raid set that is
3334 * being initialized.
3335 */
3336 rdev_for_each(rdev, mddev)
3337 if (!test_bit(Journal, &rdev->flags) &&
3338 !test_bit(In_sync, &rdev->flags))
3339 *array_in_sync = true;
3340 #if 0
3341 r = 0; /* HM FIXME: TESTME: https://bugzilla.redhat.com/show_bug.cgi?id=1210637 ? */
3342 #endif
3343 }
3344 }
3345
3346 return r;
3347 }
3348
3349 /* Helper to return @dev name or "-" if !@dev */
3350 static const char *__get_dev_name(struct dm_dev *dev)
3351 {
3352 return dev ? dev->name : "-";
3353 }
3354
3355 static void raid_status(struct dm_target *ti, status_type_t type,
3356 unsigned int status_flags, char *result, unsigned int maxlen)
3357 {
3358 struct raid_set *rs = ti->private;
3359 struct mddev *mddev = &rs->md;
3360 struct r5conf *conf = mddev->private;
3361 int i, max_nr_stripes = conf ? conf->max_nr_stripes : 0;
3362 bool array_in_sync;
3363 unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */
3364 unsigned int sz = 0;
3365 unsigned int rebuild_disks;
3366 unsigned int write_mostly_params = 0;
3367 sector_t progress, resync_max_sectors, resync_mismatches;
3368 const char *sync_action;
3369 struct raid_type *rt;
3370
3371 switch (type) {
3372 case STATUSTYPE_INFO:
3373 /* *Should* always succeed */
3374 rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
3375 if (!rt)
3376 return;
3377
3378 DMEMIT("%s %d ", rt->name, mddev->raid_disks);
3379
3380 /* Access most recent mddev properties for status output */
3381 smp_rmb();
3382 /* Get sensible max sectors even if raid set not yet started */
3383 resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ?
3384 mddev->resync_max_sectors : mddev->dev_sectors;
3385 progress = rs_get_progress(rs, resync_max_sectors, &array_in_sync);
3386 resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ?
3387 atomic64_read(&mddev->resync_mismatches) : 0;
3388 sync_action = decipher_sync_action(&rs->md);
3389
3390 /* HM FIXME: do we want another state char for raid0? It shows 'D'/'A'/'-' now */
3391 for (i = 0; i < rs->raid_disks; i++)
3392 DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev, array_in_sync));
3393
3394 /*
3395 * In-sync/Reshape ratio:
3396 * The in-sync ratio shows the progress of:
3397 * - Initializing the raid set
3398 * - Rebuilding a subset of devices of the raid set
3399 * The user can distinguish between the two by referring
3400 * to the status characters.
3401 *
3402 * The reshape ratio shows the progress of
3403 * changing the raid layout or the number of
3404 * disks of a raid set
3405 */
3406 DMEMIT(" %llu/%llu", (unsigned long long) progress,
3407 (unsigned long long) resync_max_sectors);
3408
3409 /*
3410 * v1.5.0+:
3411 *
3412 * Sync action:
3413 * See Documentation/device-mapper/dm-raid.txt for
3414 * information on each of these states.
3415 */
3416 DMEMIT(" %s", sync_action);
3417
3418 /*
3419 * v1.5.0+:
3420 *
3421 * resync_mismatches/mismatch_cnt
3422 * This field shows the number of discrepancies found when
3423 * performing a "check" of the raid set.
3424 */
3425 DMEMIT(" %llu", (unsigned long long) resync_mismatches);
3426
3427 /*
3428 * v1.9.0+:
3429 *
3430 * data_offset (needed for out of space reshaping)
3431 * This field shows the data offset into the data
3432 * image LV where the first stripes data starts.
3433 *
3434 * We keep data_offset equal on all raid disks of the set,
3435 * so retrieving it from the first raid disk is sufficient.
3436 */
3437 DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset);
3438
3439 /*
3440 * v1.10.0+:
3441 */
3442 DMEMIT(" %s", test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ?
3443 __raid_dev_status(rs, &rs->journal_dev.rdev, 0) : "-");
3444 break;
3445
3446 case STATUSTYPE_TABLE:
3447 /* Report the table line string you would use to construct this raid set */
3448
3449 /* Calculate raid parameter count */
3450 for (i = 0; i < rs->raid_disks; i++)
3451 if (test_bit(WriteMostly, &rs->dev[i].rdev.flags))
3452 write_mostly_params += 2;
3453 rebuild_disks = memweight(rs->rebuild_disks, DISKS_ARRAY_ELEMS * sizeof(*rs->rebuild_disks));
3454 raid_param_cnt += rebuild_disks * 2 +
3455 write_mostly_params +
3456 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) +
3457 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2 +
3458 (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ? 2 : 0) +
3459 (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags) ? 2 : 0);
3460
3461 /* Emit table line */
3462 /* This has to be in the documented order for userspace! */
3463 DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors);
3464 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
3465 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC));
3466 if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
3467 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC));
3468 if (rebuild_disks)
3469 for (i = 0; i < rs->raid_disks; i++)
3470 if (test_bit(rs->dev[i].rdev.raid_disk, (void *) rs->rebuild_disks))
3471 DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD),
3472 rs->dev[i].rdev.raid_disk);
3473 if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags))
3474 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP),
3475 mddev->bitmap_info.daemon_sleep);
3476 if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags))
3477 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE),
3478 mddev->sync_speed_min);
3479 if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags))
3480 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE),
3481 mddev->sync_speed_max);
3482 if (write_mostly_params)
3483 for (i = 0; i < rs->raid_disks; i++)
3484 if (test_bit(WriteMostly, &rs->dev[i].rdev.flags))
3485 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY),
3486 rs->dev[i].rdev.raid_disk);
3487 if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags))
3488 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND),
3489 mddev->bitmap_info.max_write_behind);
3490 if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags))
3491 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE),
3492 max_nr_stripes);
3493 if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags))
3494 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE),
3495 (unsigned long long) to_sector(mddev->bitmap_info.chunksize));
3496 if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags))
3497 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES),
3498 raid10_md_layout_to_copies(mddev->layout));
3499 if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags))
3500 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT),
3501 raid10_md_layout_to_format(mddev->layout));
3502 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags))
3503 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS),
3504 max(rs->delta_disks, mddev->delta_disks));
3505 if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags))
3506 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET),
3507 (unsigned long long) rs->data_offset);
3508 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags))
3509 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV),
3510 __get_dev_name(rs->journal_dev.dev));
3511 if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags))
3512 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE),
3513 md_journal_mode_to_dm_raid(rs->journal_dev.mode));
3514 DMEMIT(" %d", rs->raid_disks);
3515 for (i = 0; i < rs->raid_disks; i++)
3516 DMEMIT(" %s %s", __get_dev_name(rs->dev[i].meta_dev),
3517 __get_dev_name(rs->dev[i].data_dev));
3518 }
3519 }
3520
3521 static int raid_message(struct dm_target *ti, unsigned int argc, char **argv)
3522 {
3523 struct raid_set *rs = ti->private;
3524 struct mddev *mddev = &rs->md;
3525
3526 if (!mddev->pers || !mddev->pers->sync_request)
3527 return -EINVAL;
3528
3529 if (!strcasecmp(argv[0], "frozen"))
3530 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3531 else
3532 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3533
3534 if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) {
3535 if (mddev->sync_thread) {
3536 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3537 md_reap_sync_thread(mddev);
3538 }
3539 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3540 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3541 return -EBUSY;
3542 else if (!strcasecmp(argv[0], "resync"))
3543 ; /* MD_RECOVERY_NEEDED set below */
3544 else if (!strcasecmp(argv[0], "recover"))
3545 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3546 else {
3547 if (!strcasecmp(argv[0], "check")) {
3548 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3549 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3550 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3551 } else if (!strcasecmp(argv[0], "repair")) {
3552 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3553 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3554 } else
3555 return -EINVAL;
3556 }
3557 if (mddev->ro == 2) {
3558 /* A write to sync_action is enough to justify
3559 * canceling read-auto mode
3560 */
3561 mddev->ro = 0;
3562 if (!mddev->suspended && mddev->sync_thread)
3563 md_wakeup_thread(mddev->sync_thread);
3564 }
3565 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3566 if (!mddev->suspended && mddev->thread)
3567 md_wakeup_thread(mddev->thread);
3568
3569 return 0;
3570 }
3571
3572 static int raid_iterate_devices(struct dm_target *ti,
3573 iterate_devices_callout_fn fn, void *data)
3574 {
3575 struct raid_set *rs = ti->private;
3576 unsigned int i;
3577 int r = 0;
3578
3579 for (i = 0; !r && i < rs->md.raid_disks; i++)
3580 if (rs->dev[i].data_dev)
3581 r = fn(ti,
3582 rs->dev[i].data_dev,
3583 0, /* No offset on data devs */
3584 rs->md.dev_sectors,
3585 data);
3586
3587 return r;
3588 }
3589
3590 static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
3591 {
3592 struct raid_set *rs = ti->private;
3593 unsigned int chunk_size = to_bytes(rs->md.chunk_sectors);
3594
3595 blk_limits_io_min(limits, chunk_size);
3596 blk_limits_io_opt(limits, chunk_size * mddev_data_stripes(rs));
3597 }
3598
3599 static void raid_presuspend(struct dm_target *ti)
3600 {
3601 struct raid_set *rs = ti->private;
3602
3603 md_stop_writes(&rs->md);
3604 }
3605
3606 static void raid_postsuspend(struct dm_target *ti)
3607 {
3608 struct raid_set *rs = ti->private;
3609
3610 if (!rs->md.suspended)
3611 mddev_suspend(&rs->md);
3612
3613 rs->md.ro = 1;
3614 }
3615
3616 static void attempt_restore_of_faulty_devices(struct raid_set *rs)
3617 {
3618 int i;
3619 uint64_t cleared_failed_devices[DISKS_ARRAY_ELEMS];
3620 unsigned long flags;
3621 bool cleared = false;
3622 struct dm_raid_superblock *sb;
3623 struct mddev *mddev = &rs->md;
3624 struct md_rdev *r;
3625
3626 /* RAID personalities have to provide hot add/remove methods or we need to bail out. */
3627 if (!mddev->pers || !mddev->pers->hot_add_disk || !mddev->pers->hot_remove_disk)
3628 return;
3629
3630 memset(cleared_failed_devices, 0, sizeof(cleared_failed_devices));
3631
3632 for (i = 0; i < mddev->raid_disks; i++) {
3633 r = &rs->dev[i].rdev;
3634 /* HM FIXME: enhance journal device recovery processing */
3635 if (test_bit(Journal, &r->flags))
3636 continue;
3637
3638 if (test_bit(Faulty, &r->flags) &&
3639 r->meta_bdev && !read_disk_sb(r, r->sb_size, true)) {
3640 DMINFO("Faulty %s device #%d has readable super block."
3641 " Attempting to revive it.",
3642 rs->raid_type->name, i);
3643
3644 /*
3645 * Faulty bit may be set, but sometimes the array can
3646 * be suspended before the personalities can respond
3647 * by removing the device from the array (i.e. calling
3648 * 'hot_remove_disk'). If they haven't yet removed
3649 * the failed device, its 'raid_disk' number will be
3650 * '>= 0' - meaning we must call this function
3651 * ourselves.
3652 */
3653 flags = r->flags;
3654 clear_bit(In_sync, &r->flags); /* Mandatory for hot remove. */
3655 if (r->raid_disk >= 0) {
3656 if (mddev->pers->hot_remove_disk(mddev, r)) {
3657 /* Failed to revive this device, try next */
3658 r->flags = flags;
3659 continue;
3660 }
3661 } else
3662 r->raid_disk = r->saved_raid_disk = i;
3663
3664 clear_bit(Faulty, &r->flags);
3665 clear_bit(WriteErrorSeen, &r->flags);
3666
3667 if (mddev->pers->hot_add_disk(mddev, r)) {
3668 /* Failed to revive this device, try next */
3669 r->raid_disk = r->saved_raid_disk = -1;
3670 r->flags = flags;
3671 } else {
3672 clear_bit(In_sync, &r->flags);
3673 r->recovery_offset = 0;
3674 set_bit(i, (void *) cleared_failed_devices);
3675 cleared = true;
3676 }
3677 }
3678 }
3679
3680 /* If any failed devices could be cleared, update all sbs failed_devices bits */
3681 if (cleared) {
3682 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
3683
3684 rdev_for_each(r, &rs->md) {
3685 if (test_bit(Journal, &r->flags))
3686 continue;
3687
3688 sb = page_address(r->sb_page);
3689 sb_retrieve_failed_devices(sb, failed_devices);
3690
3691 for (i = 0; i < DISKS_ARRAY_ELEMS; i++)
3692 failed_devices[i] &= ~cleared_failed_devices[i];
3693
3694 sb_update_failed_devices(sb, failed_devices);
3695 }
3696 }
3697 }
3698
3699 static int __load_dirty_region_bitmap(struct raid_set *rs)
3700 {
3701 int r = 0;
3702
3703 /* Try loading the bitmap unless "raid0", which does not have one */
3704 if (!rs_is_raid0(rs) &&
3705 !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) {
3706 r = bitmap_load(&rs->md);
3707 if (r)
3708 DMERR("Failed to load bitmap");
3709 }
3710
3711 return r;
3712 }
3713
3714 /* Enforce updating all superblocks */
3715 static void rs_update_sbs(struct raid_set *rs)
3716 {
3717 struct mddev *mddev = &rs->md;
3718 int ro = mddev->ro;
3719
3720 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3721 mddev->ro = 0;
3722 md_update_sb(mddev, 1);
3723 mddev->ro = ro;
3724 }
3725
3726 /*
3727 * Reshape changes raid algorithm of @rs to new one within personality
3728 * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes
3729 * disks from a raid set thus growing/shrinking it or resizes the set
3730 *
3731 * Call mddev_lock_nointr() before!
3732 */
3733 static int rs_start_reshape(struct raid_set *rs)
3734 {
3735 int r;
3736 struct mddev *mddev = &rs->md;
3737 struct md_personality *pers = mddev->pers;
3738
3739 r = rs_setup_reshape(rs);
3740 if (r)
3741 return r;
3742
3743 /* Need to be resumed to be able to start reshape, recovery is frozen until raid_resume() though */
3744 if (mddev->suspended)
3745 mddev_resume(mddev);
3746
3747 /*
3748 * Check any reshape constraints enforced by the personalility
3749 *
3750 * May as well already kick the reshape off so that * pers->start_reshape() becomes optional.
3751 */
3752 r = pers->check_reshape(mddev);
3753 if (r) {
3754 rs->ti->error = "pers->check_reshape() failed";
3755 return r;
3756 }
3757
3758 /*
3759 * Personality may not provide start reshape method in which
3760 * case check_reshape above has already covered everything
3761 */
3762 if (pers->start_reshape) {
3763 r = pers->start_reshape(mddev);
3764 if (r) {
3765 rs->ti->error = "pers->start_reshape() failed";
3766 return r;
3767 }
3768 }
3769
3770 /* Suspend because a resume will happen in raid_resume() */
3771 if (!mddev->suspended)
3772 mddev_suspend(mddev);
3773
3774 /*
3775 * Now reshape got set up, update superblocks to
3776 * reflect the fact so that a table reload will
3777 * access proper superblock content in the ctr.
3778 */
3779 rs_update_sbs(rs);
3780
3781 return 0;
3782 }
3783
3784 static int raid_preresume(struct dm_target *ti)
3785 {
3786 int r;
3787 struct raid_set *rs = ti->private;
3788 struct mddev *mddev = &rs->md;
3789
3790 /* This is a resume after a suspend of the set -> it's already started */
3791 if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags))
3792 return 0;
3793
3794 /*
3795 * The superblocks need to be updated on disk if the
3796 * array is new or new devices got added (thus zeroed
3797 * out by userspace) or __load_dirty_region_bitmap
3798 * will overwrite them in core with old data or fail.
3799 */
3800 if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags))
3801 rs_update_sbs(rs);
3802
3803 /* Load the bitmap from disk unless raid0 */
3804 r = __load_dirty_region_bitmap(rs);
3805 if (r)
3806 return r;
3807
3808 /* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) */
3809 if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) && mddev->bitmap &&
3810 mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)) {
3811 r = bitmap_resize(mddev->bitmap, mddev->dev_sectors,
3812 to_bytes(rs->requested_bitmap_chunk_sectors), 0);
3813 if (r)
3814 DMERR("Failed to resize bitmap");
3815 }
3816
3817 /* Check for any resize/reshape on @rs and adjust/initiate */
3818 /* Be prepared for mddev_resume() in raid_resume() */
3819 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3820 if (mddev->recovery_cp && mddev->recovery_cp < MaxSector) {
3821 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3822 mddev->resync_min = mddev->recovery_cp;
3823 }
3824
3825 rs_set_capacity(rs);
3826
3827 /* Check for any reshape request unless new raid set */
3828 if (test_and_clear_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
3829 /* Initiate a reshape. */
3830 mddev_lock_nointr(mddev);
3831 r = rs_start_reshape(rs);
3832 mddev_unlock(mddev);
3833 if (r)
3834 DMWARN("Failed to check/start reshape, continuing without change");
3835 r = 0;
3836 }
3837
3838 return r;
3839 }
3840
3841 static void raid_resume(struct dm_target *ti)
3842 {
3843 struct raid_set *rs = ti->private;
3844 struct mddev *mddev = &rs->md;
3845
3846 if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) {
3847 /*
3848 * A secondary resume while the device is active.
3849 * Take this opportunity to check whether any failed
3850 * devices are reachable again.
3851 */
3852 attempt_restore_of_faulty_devices(rs);
3853 }
3854
3855 mddev->ro = 0;
3856 mddev->in_sync = 0;
3857
3858 /*
3859 * Keep the RAID set frozen if reshape/rebuild flags are set.
3860 * The RAID set is unfrozen once the next table load/resume,
3861 * which clears the reshape/rebuild flags, occurs.
3862 * This ensures that the constructor for the inactive table
3863 * retrieves an up-to-date reshape_position.
3864 */
3865 if (!(rs->ctr_flags & RESUME_STAY_FROZEN_FLAGS))
3866 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3867
3868 if (mddev->suspended)
3869 mddev_resume(mddev);
3870 }
3871
3872 static struct target_type raid_target = {
3873 .name = "raid",
3874 .version = {1, 11, 1},
3875 .module = THIS_MODULE,
3876 .ctr = raid_ctr,
3877 .dtr = raid_dtr,
3878 .map = raid_map,
3879 .status = raid_status,
3880 .message = raid_message,
3881 .iterate_devices = raid_iterate_devices,
3882 .io_hints = raid_io_hints,
3883 .presuspend = raid_presuspend,
3884 .postsuspend = raid_postsuspend,
3885 .preresume = raid_preresume,
3886 .resume = raid_resume,
3887 };
3888
3889 static int __init dm_raid_init(void)
3890 {
3891 DMINFO("Loading target version %u.%u.%u",
3892 raid_target.version[0],
3893 raid_target.version[1],
3894 raid_target.version[2]);
3895 return dm_register_target(&raid_target);
3896 }
3897
3898 static void __exit dm_raid_exit(void)
3899 {
3900 dm_unregister_target(&raid_target);
3901 }
3902
3903 module_init(dm_raid_init);
3904 module_exit(dm_raid_exit);
3905
3906 module_param(devices_handle_discard_safely, bool, 0644);
3907 MODULE_PARM_DESC(devices_handle_discard_safely,
3908 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
3909
3910 MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target");
3911 MODULE_ALIAS("dm-raid0");
3912 MODULE_ALIAS("dm-raid1");
3913 MODULE_ALIAS("dm-raid10");
3914 MODULE_ALIAS("dm-raid4");
3915 MODULE_ALIAS("dm-raid5");
3916 MODULE_ALIAS("dm-raid6");
3917 MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
3918 MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>");
3919 MODULE_LICENSE("GPL");