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