2 * Copyright (C) 2010-2011 Neil Brown
3 * Copyright (C) 2010-2017 Red Hat, Inc. All rights reserved.
5 * This file is released under the GPL.
8 #include <linux/slab.h>
9 #include <linux/module.h>
15 #include "md-bitmap.h"
17 #include <linux/device-mapper.h>
19 #define DM_MSG_PREFIX "raid"
20 #define MAX_RAID_DEVICES 253 /* md-raid kernel limit */
23 * Minimum sectors of free reshape space per raid device
25 #define MIN_FREE_RESHAPE_SPACE to_sector(4*4096)
28 * Minimum journal space 4 MiB in sectors.
30 #define MIN_RAID456_JOURNAL_SPACE (4*2048)
32 static bool devices_handle_discard_safely = false;
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.
38 #define FirstUse 10 /* rdev flag */
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
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 ------|
53 struct dm_dev *meta_dev;
54 struct dm_dev *data_dev;
59 * Bits for establishing rs->ctr_flags
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 */
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! */
82 #define __CTR_FLAG_JOURNAL_DEV 15 /* 2 */ /* Only with raid4/5/6 (journal device)! */
85 #define __CTR_FLAG_JOURNAL_MODE 16 /* 2 */ /* Only with raid4/5/6 (journal mode)! */
88 * Flags for rs->ctr_flags field.
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)
108 #define RESUME_STAY_FROZEN_FLAGS (CTR_FLAG_DELTA_DISKS | CTR_FLAG_DATA_OFFSET)
111 * Definitions of various constructor flags to
112 * be used in checks of valid / invalid flags
115 /* Define all any sync flags */
116 #define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)
118 /* Define flags for options without argument (e.g. 'nosync') */
119 #define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \
120 CTR_FLAG_RAID10_USE_NEAR_SETS)
122 /* Define flags for options with one argument (e.g. 'delta_disks +2') */
123 #define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \
124 CTR_FLAG_WRITE_MOSTLY | \
125 CTR_FLAG_DAEMON_SLEEP | \
126 CTR_FLAG_MIN_RECOVERY_RATE | \
127 CTR_FLAG_MAX_RECOVERY_RATE | \
128 CTR_FLAG_MAX_WRITE_BEHIND | \
129 CTR_FLAG_STRIPE_CACHE | \
130 CTR_FLAG_REGION_SIZE | \
131 CTR_FLAG_RAID10_COPIES | \
132 CTR_FLAG_RAID10_FORMAT | \
133 CTR_FLAG_DELTA_DISKS | \
134 CTR_FLAG_DATA_OFFSET)
136 /* Valid options definitions per raid level... */
138 /* "raid0" does only accept data offset */
139 #define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET)
141 /* "raid1" does not accept stripe cache, data offset, delta_disks or any raid10 options */
142 #define RAID1_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
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)
153 /* "raid10" does not accept any raid1 or stripe cache options */
154 #define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
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)
167 * "raid4/5/6" do not accept any raid1 or raid10 specific options
169 * "raid6" does not accept "nosync", because it is not guaranteed
170 * that both parity and q-syndrome are being written properly with
173 #define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
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)
185 #define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \
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 */
199 * Flags for rs->runtime_flags field
200 * (RT_FLAG prefix meaning "runtime flag")
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.
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
215 /* Array elements of 64 bit needed for rebuild/failed disk bits */
216 #define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8)
219 * raid set level, layout and chunk sectors backup/restore
224 int new_chunk_sectors;
228 struct dm_target *ti;
230 uint32_t bitmap_loaded;
231 uint32_t stripe_cache_entries;
232 unsigned long ctr_flags;
233 unsigned long runtime_flags;
235 uint64_t rebuild_disks[DISKS_ARRAY_ELEMS];
241 int requested_bitmap_chunk_sectors;
244 struct raid_type *raid_type;
245 struct dm_target_callbacks callbacks;
247 /* Optional raid4/5/6 journal device */
254 struct raid_dev dev[0];
257 static void rs_config_backup(struct raid_set *rs, struct rs_layout *l)
259 struct mddev *mddev = &rs->md;
261 l->new_level = mddev->new_level;
262 l->new_layout = mddev->new_layout;
263 l->new_chunk_sectors = mddev->new_chunk_sectors;
266 static void rs_config_restore(struct raid_set *rs, struct rs_layout *l)
268 struct mddev *mddev = &rs->md;
270 mddev->new_level = l->new_level;
271 mddev->new_layout = l->new_layout;
272 mddev->new_chunk_sectors = l->new_chunk_sectors;
275 /* raid10 algorithms (i.e. formats) */
276 #define ALGORITHM_RAID10_DEFAULT 0
277 #define ALGORITHM_RAID10_NEAR 1
278 #define ALGORITHM_RAID10_OFFSET 2
279 #define ALGORITHM_RAID10_FAR 3
281 /* Supported raid types and properties. */
282 static struct raid_type {
283 const char *name; /* RAID algorithm. */
284 const char *descr; /* Descriptor text for logging. */
285 const unsigned int parity_devs; /* # of parity devices. */
286 const unsigned int minimal_devs;/* minimal # of devices in set. */
287 const unsigned int level; /* RAID level. */
288 const unsigned int algorithm; /* RAID algorithm. */
290 {"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */},
291 {"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */},
292 {"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR},
293 {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET},
294 {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR},
295 {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT},
296 {"raid4", "raid4 (dedicated first parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, /* raid4 layout = raid5_0 */
297 {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N},
298 {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
299 {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
300 {"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
301 {"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
302 {"raid6_zr", "raid6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART},
303 {"raid6_nr", "raid6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART},
304 {"raid6_nc", "raid6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE},
305 {"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6},
306 {"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6},
307 {"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6},
308 {"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6},
309 {"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6}
312 /* True, if @v is in inclusive range [@min, @max] */
313 static bool __within_range(long v, long min, long max)
315 return v >= min && v <= max;
318 /* All table line arguments are defined here */
319 static struct arg_name_flag {
320 const unsigned long flag;
322 } __arg_name_flags[] = {
323 { CTR_FLAG_SYNC, "sync"},
324 { CTR_FLAG_NOSYNC, "nosync"},
325 { CTR_FLAG_REBUILD, "rebuild"},
326 { CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"},
327 { CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"},
328 { CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"},
329 { CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"},
330 { CTR_FLAG_WRITE_MOSTLY, "write_mostly"},
331 { CTR_FLAG_STRIPE_CACHE, "stripe_cache"},
332 { CTR_FLAG_REGION_SIZE, "region_size"},
333 { CTR_FLAG_RAID10_COPIES, "raid10_copies"},
334 { CTR_FLAG_RAID10_FORMAT, "raid10_format"},
335 { CTR_FLAG_DATA_OFFSET, "data_offset"},
336 { CTR_FLAG_DELTA_DISKS, "delta_disks"},
337 { CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"},
338 { CTR_FLAG_JOURNAL_DEV, "journal_dev" },
339 { CTR_FLAG_JOURNAL_MODE, "journal_mode" },
342 /* Return argument name string for given @flag */
343 static const char *dm_raid_arg_name_by_flag(const uint32_t flag)
345 if (hweight32(flag) == 1) {
346 struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags);
348 while (anf-- > __arg_name_flags)
349 if (flag & anf->flag)
353 DMERR("%s called with more than one flag!", __func__);
358 /* Define correlation of raid456 journal cache modes and dm-raid target line parameters */
362 } _raid456_journal_mode[] = {
363 { R5C_JOURNAL_MODE_WRITE_THROUGH , "writethrough" },
364 { R5C_JOURNAL_MODE_WRITE_BACK , "writeback" }
367 /* Return MD raid4/5/6 journal mode for dm @journal_mode one */
368 static int dm_raid_journal_mode_to_md(const char *mode)
370 int m = ARRAY_SIZE(_raid456_journal_mode);
373 if (!strcasecmp(mode, _raid456_journal_mode[m].param))
374 return _raid456_journal_mode[m].mode;
379 /* Return dm-raid raid4/5/6 journal mode string for @mode */
380 static const char *md_journal_mode_to_dm_raid(const int mode)
382 int m = ARRAY_SIZE(_raid456_journal_mode);
385 if (mode == _raid456_journal_mode[m].mode)
386 return _raid456_journal_mode[m].param;
392 * Bool helpers to test for various raid levels of a raid set.
393 * It's level as reported by the superblock rather than
394 * the requested raid_type passed to the constructor.
396 /* Return true, if raid set in @rs is raid0 */
397 static bool rs_is_raid0(struct raid_set *rs)
399 return !rs->md.level;
402 /* Return true, if raid set in @rs is raid1 */
403 static bool rs_is_raid1(struct raid_set *rs)
405 return rs->md.level == 1;
408 /* Return true, if raid set in @rs is raid10 */
409 static bool rs_is_raid10(struct raid_set *rs)
411 return rs->md.level == 10;
414 /* Return true, if raid set in @rs is level 6 */
415 static bool rs_is_raid6(struct raid_set *rs)
417 return rs->md.level == 6;
420 /* Return true, if raid set in @rs is level 4, 5 or 6 */
421 static bool rs_is_raid456(struct raid_set *rs)
423 return __within_range(rs->md.level, 4, 6);
426 /* Return true, if raid set in @rs is reshapable */
427 static bool __is_raid10_far(int layout);
428 static bool rs_is_reshapable(struct raid_set *rs)
430 return rs_is_raid456(rs) ||
431 (rs_is_raid10(rs) && !__is_raid10_far(rs->md.new_layout));
434 /* Return true, if raid set in @rs is recovering */
435 static bool rs_is_recovering(struct raid_set *rs)
437 return rs->md.recovery_cp < rs->md.dev_sectors;
440 /* Return true, if raid set in @rs is reshaping */
441 static bool rs_is_reshaping(struct raid_set *rs)
443 return rs->md.reshape_position != MaxSector;
447 * bool helpers to test for various raid levels of a raid type @rt
450 /* Return true, if raid type in @rt is raid0 */
451 static bool rt_is_raid0(struct raid_type *rt)
456 /* Return true, if raid type in @rt is raid1 */
457 static bool rt_is_raid1(struct raid_type *rt)
459 return rt->level == 1;
462 /* Return true, if raid type in @rt is raid10 */
463 static bool rt_is_raid10(struct raid_type *rt)
465 return rt->level == 10;
468 /* Return true, if raid type in @rt is raid4/5 */
469 static bool rt_is_raid45(struct raid_type *rt)
471 return __within_range(rt->level, 4, 5);
474 /* Return true, if raid type in @rt is raid6 */
475 static bool rt_is_raid6(struct raid_type *rt)
477 return rt->level == 6;
480 /* Return true, if raid type in @rt is raid4/5/6 */
481 static bool rt_is_raid456(struct raid_type *rt)
483 return __within_range(rt->level, 4, 6);
485 /* END: raid level bools */
487 /* Return valid ctr flags for the raid level of @rs */
488 static unsigned long __valid_flags(struct raid_set *rs)
490 if (rt_is_raid0(rs->raid_type))
491 return RAID0_VALID_FLAGS;
492 else if (rt_is_raid1(rs->raid_type))
493 return RAID1_VALID_FLAGS;
494 else if (rt_is_raid10(rs->raid_type))
495 return RAID10_VALID_FLAGS;
496 else if (rt_is_raid45(rs->raid_type))
497 return RAID45_VALID_FLAGS;
498 else if (rt_is_raid6(rs->raid_type))
499 return RAID6_VALID_FLAGS;
505 * Check for valid flags set on @rs
507 * Has to be called after parsing of the ctr flags!
509 static int rs_check_for_valid_flags(struct raid_set *rs)
511 if (rs->ctr_flags & ~__valid_flags(rs)) {
512 rs->ti->error = "Invalid flags combination";
519 /* MD raid10 bit definitions and helpers */
520 #define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */
521 #define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */
522 #define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */
523 #define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */
525 /* Return md raid10 near copies for @layout */
526 static unsigned int __raid10_near_copies(int layout)
528 return layout & 0xFF;
531 /* Return md raid10 far copies for @layout */
532 static unsigned int __raid10_far_copies(int layout)
534 return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);
537 /* Return true if md raid10 offset for @layout */
538 static bool __is_raid10_offset(int layout)
540 return !!(layout & RAID10_OFFSET);
543 /* Return true if md raid10 near for @layout */
544 static bool __is_raid10_near(int layout)
546 return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1;
549 /* Return true if md raid10 far for @layout */
550 static bool __is_raid10_far(int layout)
552 return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1;
555 /* Return md raid10 layout string for @layout */
556 static const char *raid10_md_layout_to_format(int layout)
559 * Bit 16 stands for "offset"
560 * (i.e. adjacent stripes hold copies)
562 * Refer to MD's raid10.c for details
564 if (__is_raid10_offset(layout))
567 if (__raid10_near_copies(layout) > 1)
570 if (__raid10_far_copies(layout) > 1)
576 /* Return md raid10 algorithm for @name */
577 static int raid10_name_to_format(const char *name)
579 if (!strcasecmp(name, "near"))
580 return ALGORITHM_RAID10_NEAR;
581 else if (!strcasecmp(name, "offset"))
582 return ALGORITHM_RAID10_OFFSET;
583 else if (!strcasecmp(name, "far"))
584 return ALGORITHM_RAID10_FAR;
589 /* Return md raid10 copies for @layout */
590 static unsigned int raid10_md_layout_to_copies(int layout)
592 return max(__raid10_near_copies(layout), __raid10_far_copies(layout));
595 /* Return md raid10 format id for @format string */
596 static int raid10_format_to_md_layout(struct raid_set *rs,
597 unsigned int algorithm,
600 unsigned int n = 1, f = 1, r = 0;
603 * MD resilienece flaw:
605 * enabling use_far_sets for far/offset formats causes copies
606 * to be colocated on the same devs together with their origins!
608 * -> disable it for now in the definition above
610 if (algorithm == ALGORITHM_RAID10_DEFAULT ||
611 algorithm == ALGORITHM_RAID10_NEAR)
614 else if (algorithm == ALGORITHM_RAID10_OFFSET) {
617 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
618 r |= RAID10_USE_FAR_SETS;
620 } else if (algorithm == ALGORITHM_RAID10_FAR) {
623 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
624 r |= RAID10_USE_FAR_SETS;
629 return r | (f << RAID10_FAR_COPIES_SHIFT) | n;
631 /* END: MD raid10 bit definitions and helpers */
633 /* Check for any of the raid10 algorithms */
634 static bool __got_raid10(struct raid_type *rtp, const int layout)
636 if (rtp->level == 10) {
637 switch (rtp->algorithm) {
638 case ALGORITHM_RAID10_DEFAULT:
639 case ALGORITHM_RAID10_NEAR:
640 return __is_raid10_near(layout);
641 case ALGORITHM_RAID10_OFFSET:
642 return __is_raid10_offset(layout);
643 case ALGORITHM_RAID10_FAR:
644 return __is_raid10_far(layout);
653 /* Return raid_type for @name */
654 static struct raid_type *get_raid_type(const char *name)
656 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
658 while (rtp-- > raid_types)
659 if (!strcasecmp(rtp->name, name))
665 /* Return raid_type for @name based derived from @level and @layout */
666 static struct raid_type *get_raid_type_by_ll(const int level, const int layout)
668 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
670 while (rtp-- > raid_types) {
671 /* RAID10 special checks based on @layout flags/properties */
672 if (rtp->level == level &&
673 (__got_raid10(rtp, layout) || rtp->algorithm == layout))
680 /* Adjust rdev sectors */
681 static void rs_set_rdev_sectors(struct raid_set *rs)
683 struct mddev *mddev = &rs->md;
684 struct md_rdev *rdev;
687 * raid10 sets rdev->sector to the device size, which
688 * is unintended in case of out-of-place reshaping
690 rdev_for_each(rdev, mddev)
691 if (!test_bit(Journal, &rdev->flags))
692 rdev->sectors = mddev->dev_sectors;
696 * Change bdev capacity of @rs in case of a disk add/remove reshape
698 static void rs_set_capacity(struct raid_set *rs)
700 struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table));
702 set_capacity(gendisk, rs->md.array_sectors);
703 revalidate_disk(gendisk);
707 * Set the mddev properties in @rs to the current
708 * ones retrieved from the freshest superblock
710 static void rs_set_cur(struct raid_set *rs)
712 struct mddev *mddev = &rs->md;
714 mddev->new_level = mddev->level;
715 mddev->new_layout = mddev->layout;
716 mddev->new_chunk_sectors = mddev->chunk_sectors;
720 * Set the mddev properties in @rs to the new
721 * ones requested by the ctr
723 static void rs_set_new(struct raid_set *rs)
725 struct mddev *mddev = &rs->md;
727 mddev->level = mddev->new_level;
728 mddev->layout = mddev->new_layout;
729 mddev->chunk_sectors = mddev->new_chunk_sectors;
730 mddev->raid_disks = rs->raid_disks;
731 mddev->delta_disks = 0;
734 static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *raid_type,
735 unsigned int raid_devs)
740 if (raid_devs <= raid_type->parity_devs) {
741 ti->error = "Insufficient number of devices";
742 return ERR_PTR(-EINVAL);
745 rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL);
747 ti->error = "Cannot allocate raid context";
748 return ERR_PTR(-ENOMEM);
753 rs->raid_disks = raid_devs;
757 rs->raid_type = raid_type;
758 rs->stripe_cache_entries = 256;
759 rs->md.raid_disks = raid_devs;
760 rs->md.level = raid_type->level;
761 rs->md.new_level = rs->md.level;
762 rs->md.layout = raid_type->algorithm;
763 rs->md.new_layout = rs->md.layout;
764 rs->md.delta_disks = 0;
765 rs->md.recovery_cp = MaxSector;
767 for (i = 0; i < raid_devs; i++)
768 md_rdev_init(&rs->dev[i].rdev);
771 * Remaining items to be initialized by further RAID params:
774 * rs->md.chunk_sectors
775 * rs->md.new_chunk_sectors
782 static void raid_set_free(struct raid_set *rs)
786 if (rs->journal_dev.dev) {
787 md_rdev_clear(&rs->journal_dev.rdev);
788 dm_put_device(rs->ti, rs->journal_dev.dev);
791 for (i = 0; i < rs->raid_disks; i++) {
792 if (rs->dev[i].meta_dev)
793 dm_put_device(rs->ti, rs->dev[i].meta_dev);
794 md_rdev_clear(&rs->dev[i].rdev);
795 if (rs->dev[i].data_dev)
796 dm_put_device(rs->ti, rs->dev[i].data_dev);
803 * For every device we have two words
804 * <meta_dev>: meta device name or '-' if missing
805 * <data_dev>: data device name or '-' if missing
807 * The following are permitted:
810 * <meta_dev> <data_dev>
812 * The following is not allowed:
815 * This code parses those words. If there is a failure,
816 * the caller must use raid_set_free() to unwind the operations.
818 static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as)
822 int metadata_available = 0;
826 /* Put off the number of raid devices argument to get to dev pairs */
827 arg = dm_shift_arg(as);
831 for (i = 0; i < rs->raid_disks; i++) {
832 rs->dev[i].rdev.raid_disk = i;
834 rs->dev[i].meta_dev = NULL;
835 rs->dev[i].data_dev = NULL;
838 * There are no offsets initially.
839 * Out of place reshape will set them accordingly.
841 rs->dev[i].rdev.data_offset = 0;
842 rs->dev[i].rdev.new_data_offset = 0;
843 rs->dev[i].rdev.mddev = &rs->md;
845 arg = dm_shift_arg(as);
849 if (strcmp(arg, "-")) {
850 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
851 &rs->dev[i].meta_dev);
853 rs->ti->error = "RAID metadata device lookup failure";
857 rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
858 if (!rs->dev[i].rdev.sb_page) {
859 rs->ti->error = "Failed to allocate superblock page";
864 arg = dm_shift_arg(as);
868 if (!strcmp(arg, "-")) {
869 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
870 (!rs->dev[i].rdev.recovery_offset)) {
871 rs->ti->error = "Drive designated for rebuild not specified";
875 if (rs->dev[i].meta_dev) {
876 rs->ti->error = "No data device supplied with metadata device";
883 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
884 &rs->dev[i].data_dev);
886 rs->ti->error = "RAID device lookup failure";
890 if (rs->dev[i].meta_dev) {
891 metadata_available = 1;
892 rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
894 rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
895 list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks);
896 if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
900 if (rs->journal_dev.dev)
901 list_add_tail(&rs->journal_dev.rdev.same_set, &rs->md.disks);
903 if (metadata_available) {
905 rs->md.persistent = 1;
906 rs->md.major_version = 2;
907 } else if (rebuild && !rs->md.recovery_cp) {
909 * Without metadata, we will not be able to tell if the array
910 * is in-sync or not - we must assume it is not. Therefore,
911 * it is impossible to rebuild a drive.
913 * Even if there is metadata, the on-disk information may
914 * indicate that the array is not in-sync and it will then
917 * User could specify 'nosync' option if desperate.
919 rs->ti->error = "Unable to rebuild drive while array is not in-sync";
927 * validate_region_size
929 * @region_size: region size in sectors. If 0, pick a size (4MiB default).
931 * Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
932 * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
934 * Returns: 0 on success, -EINVAL on failure.
936 static int validate_region_size(struct raid_set *rs, unsigned long region_size)
938 unsigned long min_region_size = rs->ti->len / (1 << 21);
945 * Choose a reasonable default. All figures in sectors.
947 if (min_region_size > (1 << 13)) {
948 /* If not a power of 2, make it the next power of 2 */
949 region_size = roundup_pow_of_two(min_region_size);
950 DMINFO("Choosing default region size of %lu sectors",
953 DMINFO("Choosing default region size of 4MiB");
954 region_size = 1 << 13; /* sectors */
958 * Validate user-supplied value.
960 if (region_size > rs->ti->len) {
961 rs->ti->error = "Supplied region size is too large";
965 if (region_size < min_region_size) {
966 DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
967 region_size, min_region_size);
968 rs->ti->error = "Supplied region size is too small";
972 if (!is_power_of_2(region_size)) {
973 rs->ti->error = "Region size is not a power of 2";
977 if (region_size < rs->md.chunk_sectors) {
978 rs->ti->error = "Region size is smaller than the chunk size";
984 * Convert sectors to bytes.
986 rs->md.bitmap_info.chunksize = to_bytes(region_size);
992 * validate_raid_redundancy
995 * Determine if there are enough devices in the array that haven't
996 * failed (or are being rebuilt) to form a usable array.
998 * Returns: 0 on success, -EINVAL on failure.
1000 static int validate_raid_redundancy(struct raid_set *rs)
1002 unsigned int i, rebuild_cnt = 0;
1003 unsigned int rebuilds_per_group = 0, copies;
1004 unsigned int group_size, last_group_start;
1006 for (i = 0; i < rs->md.raid_disks; i++)
1007 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) ||
1008 !rs->dev[i].rdev.sb_page)
1011 switch (rs->raid_type->level) {
1015 if (rebuild_cnt >= rs->md.raid_disks)
1021 if (rebuild_cnt > rs->raid_type->parity_devs)
1025 copies = raid10_md_layout_to_copies(rs->md.new_layout);
1026 if (rebuild_cnt < copies)
1030 * It is possible to have a higher rebuild count for RAID10,
1031 * as long as the failed devices occur in different mirror
1032 * groups (i.e. different stripes).
1034 * When checking "near" format, make sure no adjacent devices
1035 * have failed beyond what can be handled. In addition to the
1036 * simple case where the number of devices is a multiple of the
1037 * number of copies, we must also handle cases where the number
1038 * of devices is not a multiple of the number of copies.
1039 * E.g. dev1 dev2 dev3 dev4 dev5
1043 if (__is_raid10_near(rs->md.new_layout)) {
1044 for (i = 0; i < rs->md.raid_disks; i++) {
1046 rebuilds_per_group = 0;
1047 if ((!rs->dev[i].rdev.sb_page ||
1048 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
1049 (++rebuilds_per_group >= copies))
1056 * When checking "far" and "offset" formats, we need to ensure
1057 * that the device that holds its copy is not also dead or
1058 * being rebuilt. (Note that "far" and "offset" formats only
1059 * support two copies right now. These formats also only ever
1060 * use the 'use_far_sets' variant.)
1062 * This check is somewhat complicated by the need to account
1063 * for arrays that are not a multiple of (far) copies. This
1064 * results in the need to treat the last (potentially larger)
1067 group_size = (rs->md.raid_disks / copies);
1068 last_group_start = (rs->md.raid_disks / group_size) - 1;
1069 last_group_start *= group_size;
1070 for (i = 0; i < rs->md.raid_disks; i++) {
1071 if (!(i % copies) && !(i > last_group_start))
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))
1091 * Possible arguments are...
1092 * <chunk_size> [optional_args]
1094 * Argument definitions
1095 * <chunk_size> The number of sectors per disk that
1096 * will form the "stripe"
1097 * [[no]sync] Force or prevent recovery of the
1099 * [rebuild <idx>] Rebuild the drive indicated by the index
1100 * [daemon_sleep <ms>] Time between bitmap daemon work to
1102 * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1103 * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1104 * [write_mostly <idx>] Indicate a write mostly drive via index
1105 * [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
1106 * [stripe_cache <sectors>] Stripe cache size for higher RAIDs
1107 * [region_size <sectors>] Defines granularity of bitmap
1108 * [journal_dev <dev>] raid4/5/6 journaling deviice
1109 * (i.e. write hole closing log)
1111 * RAID10-only options:
1112 * [raid10_copies <# copies>] Number of copies. (Default: 2)
1113 * [raid10_format <near|far|offset>] Layout algorithm. (Default: near)
1115 static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
1116 unsigned int num_raid_params)
1118 int value, raid10_format = ALGORITHM_RAID10_DEFAULT;
1119 unsigned int raid10_copies = 2;
1120 unsigned int i, write_mostly = 0;
1121 unsigned int region_size = 0;
1122 sector_t max_io_len;
1123 const char *arg, *key;
1124 struct raid_dev *rd;
1125 struct raid_type *rt = rs->raid_type;
1127 arg = dm_shift_arg(as);
1128 num_raid_params--; /* Account for chunk_size argument */
1130 if (kstrtoint(arg, 10, &value) < 0) {
1131 rs->ti->error = "Bad numerical argument given for chunk_size";
1136 * First, parse the in-order required arguments
1137 * "chunk_size" is the only argument of this type.
1139 if (rt_is_raid1(rt)) {
1141 DMERR("Ignoring chunk size parameter for RAID 1");
1143 } else if (!is_power_of_2(value)) {
1144 rs->ti->error = "Chunk size must be a power of 2";
1146 } else if (value < 8) {
1147 rs->ti->error = "Chunk size value is too small";
1151 rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
1154 * We set each individual device as In_sync with a completed
1155 * 'recovery_offset'. If there has been a device failure or
1156 * replacement then one of the following cases applies:
1158 * 1) User specifies 'rebuild'.
1159 * - Device is reset when param is read.
1160 * 2) A new device is supplied.
1161 * - No matching superblock found, resets device.
1162 * 3) Device failure was transient and returns on reload.
1163 * - Failure noticed, resets device for bitmap replay.
1164 * 4) Device hadn't completed recovery after previous failure.
1165 * - Superblock is read and overrides recovery_offset.
1167 * What is found in the superblocks of the devices is always
1168 * authoritative, unless 'rebuild' or '[no]sync' was specified.
1170 for (i = 0; i < rs->raid_disks; i++) {
1171 set_bit(In_sync, &rs->dev[i].rdev.flags);
1172 rs->dev[i].rdev.recovery_offset = MaxSector;
1176 * Second, parse the unordered optional arguments
1178 for (i = 0; i < num_raid_params; i++) {
1179 key = dm_shift_arg(as);
1181 rs->ti->error = "Not enough raid parameters given";
1185 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) {
1186 if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1187 rs->ti->error = "Only one 'nosync' argument allowed";
1192 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) {
1193 if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) {
1194 rs->ti->error = "Only one 'sync' argument allowed";
1199 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) {
1200 if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
1201 rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed";
1207 arg = dm_shift_arg(as);
1208 i++; /* Account for the argument pairs */
1210 rs->ti->error = "Wrong number of raid parameters given";
1215 * Parameters that take a string value are checked here.
1217 /* "raid10_format {near|offset|far} */
1218 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) {
1219 if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) {
1220 rs->ti->error = "Only one 'raid10_format' argument pair allowed";
1223 if (!rt_is_raid10(rt)) {
1224 rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type";
1227 raid10_format = raid10_name_to_format(arg);
1228 if (raid10_format < 0) {
1229 rs->ti->error = "Invalid 'raid10_format' value given";
1230 return raid10_format;
1235 /* "journal_dev <dev>" */
1236 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV))) {
1238 struct md_rdev *jdev;
1240 if (test_and_set_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
1241 rs->ti->error = "Only one raid4/5/6 set journaling device allowed";
1244 if (!rt_is_raid456(rt)) {
1245 rs->ti->error = "'journal_dev' is an invalid parameter for this RAID type";
1248 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
1249 &rs->journal_dev.dev);
1251 rs->ti->error = "raid4/5/6 journal device lookup failure";
1254 jdev = &rs->journal_dev.rdev;
1256 jdev->mddev = &rs->md;
1257 jdev->bdev = rs->journal_dev.dev->bdev;
1258 jdev->sectors = to_sector(i_size_read(jdev->bdev->bd_inode));
1259 if (jdev->sectors < MIN_RAID456_JOURNAL_SPACE) {
1260 rs->ti->error = "No space for raid4/5/6 journal";
1263 rs->journal_dev.mode = R5C_JOURNAL_MODE_WRITE_THROUGH;
1264 set_bit(Journal, &jdev->flags);
1268 /* "journal_mode <mode>" ("journal_dev" mandatory!) */
1269 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE))) {
1272 if (!test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
1273 rs->ti->error = "raid4/5/6 'journal_mode' is invalid without 'journal_dev'";
1276 if (test_and_set_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
1277 rs->ti->error = "Only one raid4/5/6 'journal_mode' argument allowed";
1280 r = dm_raid_journal_mode_to_md(arg);
1282 rs->ti->error = "Invalid 'journal_mode' argument";
1285 rs->journal_dev.mode = r;
1290 * Parameters with number values from here on.
1292 if (kstrtoint(arg, 10, &value) < 0) {
1293 rs->ti->error = "Bad numerical argument given in raid params";
1297 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) {
1299 * "rebuild" is being passed in by userspace to provide
1300 * indexes of replaced devices and to set up additional
1301 * devices on raid level takeover.
1303 if (!__within_range(value, 0, rs->raid_disks - 1)) {
1304 rs->ti->error = "Invalid rebuild index given";
1308 if (test_and_set_bit(value, (void *) rs->rebuild_disks)) {
1309 rs->ti->error = "rebuild for this index already given";
1313 rd = rs->dev + value;
1314 clear_bit(In_sync, &rd->rdev.flags);
1315 clear_bit(Faulty, &rd->rdev.flags);
1316 rd->rdev.recovery_offset = 0;
1317 set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags);
1318 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) {
1319 if (!rt_is_raid1(rt)) {
1320 rs->ti->error = "write_mostly option is only valid for RAID1";
1324 if (!__within_range(value, 0, rs->md.raid_disks - 1)) {
1325 rs->ti->error = "Invalid write_mostly index given";
1330 set_bit(WriteMostly, &rs->dev[value].rdev.flags);
1331 set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags);
1332 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) {
1333 if (!rt_is_raid1(rt)) {
1334 rs->ti->error = "max_write_behind option is only valid for RAID1";
1338 if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) {
1339 rs->ti->error = "Only one max_write_behind argument pair allowed";
1344 * In device-mapper, we specify things in sectors, but
1345 * MD records this value in kB
1348 if (value > COUNTER_MAX) {
1349 rs->ti->error = "Max write-behind limit out of range";
1353 rs->md.bitmap_info.max_write_behind = value;
1354 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) {
1355 if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) {
1356 rs->ti->error = "Only one daemon_sleep argument pair allowed";
1359 if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
1360 rs->ti->error = "daemon sleep period out of range";
1363 rs->md.bitmap_info.daemon_sleep = value;
1364 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) {
1365 /* Userspace passes new data_offset after having extended the the data image LV */
1366 if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
1367 rs->ti->error = "Only one data_offset argument pair allowed";
1370 /* Ensure sensible data offset */
1372 (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) {
1373 rs->ti->error = "Bogus data_offset value";
1376 rs->data_offset = value;
1377 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) {
1378 /* Define the +/-# of disks to add to/remove from the given raid set */
1379 if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
1380 rs->ti->error = "Only one delta_disks argument pair allowed";
1383 /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */
1384 if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) {
1385 rs->ti->error = "Too many delta_disk requested";
1389 rs->delta_disks = value;
1390 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) {
1391 if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) {
1392 rs->ti->error = "Only one stripe_cache argument pair allowed";
1396 if (!rt_is_raid456(rt)) {
1397 rs->ti->error = "Inappropriate argument: stripe_cache";
1401 rs->stripe_cache_entries = value;
1402 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) {
1403 if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
1404 rs->ti->error = "Only one min_recovery_rate argument pair allowed";
1407 if (value > INT_MAX) {
1408 rs->ti->error = "min_recovery_rate out of range";
1411 rs->md.sync_speed_min = (int)value;
1412 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) {
1413 if (test_and_set_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) {
1414 rs->ti->error = "Only one max_recovery_rate argument pair allowed";
1417 if (value > INT_MAX) {
1418 rs->ti->error = "max_recovery_rate out of range";
1421 rs->md.sync_speed_max = (int)value;
1422 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) {
1423 if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) {
1424 rs->ti->error = "Only one region_size argument pair allowed";
1428 region_size = value;
1429 rs->requested_bitmap_chunk_sectors = value;
1430 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) {
1431 if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) {
1432 rs->ti->error = "Only one raid10_copies argument pair allowed";
1436 if (!__within_range(value, 2, rs->md.raid_disks)) {
1437 rs->ti->error = "Bad value for 'raid10_copies'";
1441 raid10_copies = value;
1443 DMERR("Unable to parse RAID parameter: %s", key);
1444 rs->ti->error = "Unable to parse RAID parameter";
1449 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) &&
1450 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1451 rs->ti->error = "sync and nosync are mutually exclusive";
1455 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) &&
1456 (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ||
1457 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))) {
1458 rs->ti->error = "sync/nosync and rebuild are mutually exclusive";
1462 if (write_mostly >= rs->md.raid_disks) {
1463 rs->ti->error = "Can't set all raid1 devices to write_mostly";
1467 if (validate_region_size(rs, region_size))
1470 if (rs->md.chunk_sectors)
1471 max_io_len = rs->md.chunk_sectors;
1473 max_io_len = region_size;
1475 if (dm_set_target_max_io_len(rs->ti, max_io_len))
1478 if (rt_is_raid10(rt)) {
1479 if (raid10_copies > rs->md.raid_disks) {
1480 rs->ti->error = "Not enough devices to satisfy specification";
1484 rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies);
1485 if (rs->md.new_layout < 0) {
1486 rs->ti->error = "Error getting raid10 format";
1487 return rs->md.new_layout;
1490 rt = get_raid_type_by_ll(10, rs->md.new_layout);
1492 rs->ti->error = "Failed to recognize new raid10 layout";
1496 if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT ||
1497 rt->algorithm == ALGORITHM_RAID10_NEAR) &&
1498 test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
1499 rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible";
1504 rs->raid10_copies = raid10_copies;
1506 /* Assume there are no metadata devices until the drives are parsed */
1507 rs->md.persistent = 0;
1508 rs->md.external = 1;
1510 /* Check, if any invalid ctr arguments have been passed in for the raid level */
1511 return rs_check_for_valid_flags(rs);
1514 /* Set raid4/5/6 cache size */
1515 static int rs_set_raid456_stripe_cache(struct raid_set *rs)
1518 struct r5conf *conf;
1519 struct mddev *mddev = &rs->md;
1520 uint32_t min_stripes = max(mddev->chunk_sectors, mddev->new_chunk_sectors) / 2;
1521 uint32_t nr_stripes = rs->stripe_cache_entries;
1523 if (!rt_is_raid456(rs->raid_type)) {
1524 rs->ti->error = "Inappropriate raid level; cannot change stripe_cache size";
1528 if (nr_stripes < min_stripes) {
1529 DMINFO("Adjusting requested %u stripe cache entries to %u to suit stripe size",
1530 nr_stripes, min_stripes);
1531 nr_stripes = min_stripes;
1534 conf = mddev->private;
1536 rs->ti->error = "Cannot change stripe_cache size on inactive RAID set";
1540 /* Try setting number of stripes in raid456 stripe cache */
1541 if (conf->min_nr_stripes != nr_stripes) {
1542 r = raid5_set_cache_size(mddev, nr_stripes);
1544 rs->ti->error = "Failed to set raid4/5/6 stripe cache size";
1548 DMINFO("%u stripe cache entries", nr_stripes);
1554 /* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */
1555 static unsigned int mddev_data_stripes(struct raid_set *rs)
1557 return rs->md.raid_disks - rs->raid_type->parity_devs;
1560 /* Return # of data stripes of @rs (i.e. as of ctr) */
1561 static unsigned int rs_data_stripes(struct raid_set *rs)
1563 return rs->raid_disks - rs->raid_type->parity_devs;
1567 * Retrieve rdev->sectors from any valid raid device of @rs
1568 * to allow userpace to pass in arbitray "- -" device tupples.
1570 static sector_t __rdev_sectors(struct raid_set *rs)
1574 for (i = 0; i < rs->md.raid_disks; i++) {
1575 struct md_rdev *rdev = &rs->dev[i].rdev;
1577 if (!test_bit(Journal, &rdev->flags) &&
1578 rdev->bdev && rdev->sectors)
1579 return rdev->sectors;
1585 /* Check that calculated dev_sectors fits all component devices. */
1586 static int _check_data_dev_sectors(struct raid_set *rs)
1589 struct md_rdev *rdev;
1591 rdev_for_each(rdev, &rs->md)
1592 if (!test_bit(Journal, &rdev->flags) && rdev->bdev) {
1593 ds = min(ds, to_sector(i_size_read(rdev->bdev->bd_inode)));
1594 if (ds < rs->md.dev_sectors) {
1595 rs->ti->error = "Component device(s) too small";
1603 /* Calculate the sectors per device and per array used for @rs */
1604 static int rs_set_dev_and_array_sectors(struct raid_set *rs, bool use_mddev)
1607 unsigned int data_stripes;
1608 struct mddev *mddev = &rs->md;
1609 struct md_rdev *rdev;
1610 sector_t array_sectors = rs->ti->len, dev_sectors = rs->ti->len;
1613 delta_disks = mddev->delta_disks;
1614 data_stripes = mddev_data_stripes(rs);
1616 delta_disks = rs->delta_disks;
1617 data_stripes = rs_data_stripes(rs);
1620 /* Special raid1 case w/o delta_disks support (yet) */
1621 if (rt_is_raid1(rs->raid_type))
1623 else if (rt_is_raid10(rs->raid_type)) {
1624 if (rs->raid10_copies < 2 ||
1626 rs->ti->error = "Bogus raid10 data copies or delta disks";
1630 dev_sectors *= rs->raid10_copies;
1631 if (sector_div(dev_sectors, data_stripes))
1634 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1635 if (sector_div(array_sectors, rs->raid10_copies))
1638 } else if (sector_div(dev_sectors, data_stripes))
1642 /* Striped layouts */
1643 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1645 rdev_for_each(rdev, mddev)
1646 if (!test_bit(Journal, &rdev->flags))
1647 rdev->sectors = dev_sectors;
1649 mddev->array_sectors = array_sectors;
1650 mddev->dev_sectors = dev_sectors;
1652 return _check_data_dev_sectors(rs);
1654 rs->ti->error = "Target length not divisible by number of data devices";
1658 /* Setup recovery on @rs */
1659 static void __rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors)
1661 /* raid0 does not recover */
1662 if (rs_is_raid0(rs))
1663 rs->md.recovery_cp = MaxSector;
1665 * A raid6 set has to be recovered either
1666 * completely or for the grown part to
1667 * ensure proper parity and Q-Syndrome
1669 else if (rs_is_raid6(rs))
1670 rs->md.recovery_cp = dev_sectors;
1672 * Other raid set types may skip recovery
1673 * depending on the 'nosync' flag.
1676 rs->md.recovery_cp = test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)
1677 ? MaxSector : dev_sectors;
1680 /* Setup recovery on @rs based on raid type, device size and 'nosync' flag */
1681 static void rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors)
1684 /* New raid set or 'sync' flag provided */
1685 __rs_setup_recovery(rs, 0);
1686 else if (dev_sectors == MaxSector)
1687 /* Prevent recovery */
1688 __rs_setup_recovery(rs, MaxSector);
1689 else if (__rdev_sectors(rs) < dev_sectors)
1690 /* Grown raid set */
1691 __rs_setup_recovery(rs, __rdev_sectors(rs));
1693 __rs_setup_recovery(rs, MaxSector);
1696 static void do_table_event(struct work_struct *ws)
1698 struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
1700 smp_rmb(); /* Make sure we access most actual mddev properties */
1701 if (!rs_is_reshaping(rs)) {
1702 if (rs_is_raid10(rs))
1703 rs_set_rdev_sectors(rs);
1704 rs_set_capacity(rs);
1706 dm_table_event(rs->ti->table);
1709 static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
1711 struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
1713 return mddev_congested(&rs->md, bits);
1717 * Make sure a valid takover (level switch) is being requested on @rs
1719 * Conversions of raid sets from one MD personality to another
1720 * have to conform to restrictions which are enforced here.
1722 static int rs_check_takeover(struct raid_set *rs)
1724 struct mddev *mddev = &rs->md;
1725 unsigned int near_copies;
1727 if (rs->md.degraded) {
1728 rs->ti->error = "Can't takeover degraded raid set";
1732 if (rs_is_reshaping(rs)) {
1733 rs->ti->error = "Can't takeover reshaping raid set";
1737 switch (mddev->level) {
1739 /* raid0 -> raid1/5 with one disk */
1740 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1741 mddev->raid_disks == 1)
1744 /* raid0 -> raid10 */
1745 if (mddev->new_level == 10 &&
1746 !(rs->raid_disks % mddev->raid_disks))
1749 /* raid0 with multiple disks -> raid4/5/6 */
1750 if (__within_range(mddev->new_level, 4, 6) &&
1751 mddev->new_layout == ALGORITHM_PARITY_N &&
1752 mddev->raid_disks > 1)
1758 /* Can't takeover raid10_offset! */
1759 if (__is_raid10_offset(mddev->layout))
1762 near_copies = __raid10_near_copies(mddev->layout);
1764 /* raid10* -> raid0 */
1765 if (mddev->new_level == 0) {
1766 /* Can takeover raid10_near with raid disks divisable by data copies! */
1767 if (near_copies > 1 &&
1768 !(mddev->raid_disks % near_copies)) {
1769 mddev->raid_disks /= near_copies;
1770 mddev->delta_disks = mddev->raid_disks;
1774 /* Can takeover raid10_far */
1775 if (near_copies == 1 &&
1776 __raid10_far_copies(mddev->layout) > 1)
1782 /* raid10_{near,far} -> raid1 */
1783 if (mddev->new_level == 1 &&
1784 max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks)
1787 /* raid10_{near,far} with 2 disks -> raid4/5 */
1788 if (__within_range(mddev->new_level, 4, 5) &&
1789 mddev->raid_disks == 2)
1794 /* raid1 with 2 disks -> raid4/5 */
1795 if (__within_range(mddev->new_level, 4, 5) &&
1796 mddev->raid_disks == 2) {
1797 mddev->degraded = 1;
1801 /* raid1 -> raid0 */
1802 if (mddev->new_level == 0 &&
1803 mddev->raid_disks == 1)
1806 /* raid1 -> raid10 */
1807 if (mddev->new_level == 10)
1812 /* raid4 -> raid0 */
1813 if (mddev->new_level == 0)
1816 /* raid4 -> raid1/5 with 2 disks */
1817 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1818 mddev->raid_disks == 2)
1821 /* raid4 -> raid5/6 with parity N */
1822 if (__within_range(mddev->new_level, 5, 6) &&
1823 mddev->layout == ALGORITHM_PARITY_N)
1828 /* raid5 with parity N -> raid0 */
1829 if (mddev->new_level == 0 &&
1830 mddev->layout == ALGORITHM_PARITY_N)
1833 /* raid5 with parity N -> raid4 */
1834 if (mddev->new_level == 4 &&
1835 mddev->layout == ALGORITHM_PARITY_N)
1838 /* raid5 with 2 disks -> raid1/4/10 */
1839 if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) &&
1840 mddev->raid_disks == 2)
1843 /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */
1844 if (mddev->new_level == 6 &&
1845 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
1846 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6)))
1851 /* raid6 with parity N -> raid0 */
1852 if (mddev->new_level == 0 &&
1853 mddev->layout == ALGORITHM_PARITY_N)
1856 /* raid6 with parity N -> raid4 */
1857 if (mddev->new_level == 4 &&
1858 mddev->layout == ALGORITHM_PARITY_N)
1861 /* raid6_*_n with Q-Syndrome N -> raid5_* */
1862 if (mddev->new_level == 5 &&
1863 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
1864 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC)))
1871 rs->ti->error = "takeover not possible";
1875 /* True if @rs requested to be taken over */
1876 static bool rs_takeover_requested(struct raid_set *rs)
1878 return rs->md.new_level != rs->md.level;
1881 /* True if @rs is requested to reshape by ctr */
1882 static bool rs_reshape_requested(struct raid_set *rs)
1885 struct mddev *mddev = &rs->md;
1887 if (rs_takeover_requested(rs))
1893 change = mddev->new_layout != mddev->layout ||
1894 mddev->new_chunk_sectors != mddev->chunk_sectors ||
1897 /* Historical case to support raid1 reshape without delta disks */
1898 if (mddev->level == 1) {
1899 if (rs->delta_disks)
1900 return !!rs->delta_disks;
1903 mddev->raid_disks != rs->raid_disks;
1906 if (mddev->level == 10)
1908 !__is_raid10_far(mddev->new_layout) &&
1909 rs->delta_disks >= 0;
1915 #define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */
1917 /* State flags for sb->flags */
1918 #define SB_FLAG_RESHAPE_ACTIVE 0x1
1919 #define SB_FLAG_RESHAPE_BACKWARDS 0x2
1922 * This structure is never routinely used by userspace, unlike md superblocks.
1923 * Devices with this superblock should only ever be accessed via device-mapper.
1925 #define DM_RAID_MAGIC 0x64526D44
1926 struct dm_raid_superblock {
1927 __le32 magic; /* "DmRd" */
1928 __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */
1930 __le32 num_devices; /* Number of devices in this raid set. (Max 64) */
1931 __le32 array_position; /* The position of this drive in the raid set */
1933 __le64 events; /* Incremented by md when superblock updated */
1934 __le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */
1935 /* indicate failures (see extension below) */
1938 * This offset tracks the progress of the repair or replacement of
1939 * an individual drive.
1941 __le64 disk_recovery_offset;
1944 * This offset tracks the progress of the initial raid set
1945 * synchronisation/parity calculation.
1947 __le64 array_resync_offset;
1950 * raid characteristics
1954 __le32 stripe_sectors;
1956 /********************************************************************
1957 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
1959 * FEATURE_FLAG_SUPPORTS_V190 in the compat_features member indicates that those exist
1962 __le32 flags; /* Flags defining array states for reshaping */
1965 * This offset tracks the progress of a raid
1966 * set reshape in order to be able to restart it
1968 __le64 reshape_position;
1971 * These define the properties of the array in case of an interrupted reshape
1975 __le32 new_stripe_sectors;
1978 __le64 array_sectors; /* Array size in sectors */
1981 * Sector offsets to data on devices (reshaping).
1982 * Needed to support out of place reshaping, thus
1983 * not writing over any stripes whilst converting
1984 * them from old to new layout
1987 __le64 new_data_offset;
1989 __le64 sectors; /* Used device size in sectors */
1992 * Additonal Bit field of devices indicating failures to support
1993 * up to 256 devices with the 1.9.0 on-disk metadata format
1995 __le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1];
1997 __le32 incompat_features; /* Used to indicate any incompatible features */
1999 /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */
2003 * Check for reshape constraints on raid set @rs:
2005 * - reshape function non-existent
2007 * - ongoing recovery
2010 * Returns 0 if none or -EPERM if given constraint
2011 * and error message reference in @errmsg
2013 static int rs_check_reshape(struct raid_set *rs)
2015 struct mddev *mddev = &rs->md;
2017 if (!mddev->pers || !mddev->pers->check_reshape)
2018 rs->ti->error = "Reshape not supported";
2019 else if (mddev->degraded)
2020 rs->ti->error = "Can't reshape degraded raid set";
2021 else if (rs_is_recovering(rs))
2022 rs->ti->error = "Convert request on recovering raid set prohibited";
2023 else if (rs_is_reshaping(rs))
2024 rs->ti->error = "raid set already reshaping!";
2025 else if (!(rs_is_raid1(rs) || rs_is_raid10(rs) || rs_is_raid456(rs)))
2026 rs->ti->error = "Reshaping only supported for raid1/4/5/6/10";
2033 static int read_disk_sb(struct md_rdev *rdev, int size, bool force_reload)
2035 BUG_ON(!rdev->sb_page);
2037 if (rdev->sb_loaded && !force_reload)
2040 rdev->sb_loaded = 0;
2042 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) {
2043 DMERR("Failed to read superblock of device at position %d",
2045 md_error(rdev->mddev, rdev);
2046 set_bit(Faulty, &rdev->flags);
2050 rdev->sb_loaded = 1;
2055 static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
2057 failed_devices[0] = le64_to_cpu(sb->failed_devices);
2058 memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices));
2060 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
2061 int i = ARRAY_SIZE(sb->extended_failed_devices);
2064 failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]);
2068 static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
2070 int i = ARRAY_SIZE(sb->extended_failed_devices);
2072 sb->failed_devices = cpu_to_le64(failed_devices[0]);
2074 sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]);
2078 * Synchronize the superblock members with the raid set properties
2080 * All superblock data is little endian.
2082 static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
2084 bool update_failed_devices = false;
2086 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
2087 struct dm_raid_superblock *sb;
2088 struct raid_set *rs = container_of(mddev, struct raid_set, md);
2090 /* No metadata device, no superblock */
2091 if (!rdev->meta_bdev)
2094 BUG_ON(!rdev->sb_page);
2096 sb = page_address(rdev->sb_page);
2098 sb_retrieve_failed_devices(sb, failed_devices);
2100 for (i = 0; i < rs->raid_disks; i++)
2101 if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) {
2102 update_failed_devices = true;
2103 set_bit(i, (void *) failed_devices);
2106 if (update_failed_devices)
2107 sb_update_failed_devices(sb, failed_devices);
2109 sb->magic = cpu_to_le32(DM_RAID_MAGIC);
2110 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
2112 sb->num_devices = cpu_to_le32(mddev->raid_disks);
2113 sb->array_position = cpu_to_le32(rdev->raid_disk);
2115 sb->events = cpu_to_le64(mddev->events);
2117 sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
2118 sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
2120 sb->level = cpu_to_le32(mddev->level);
2121 sb->layout = cpu_to_le32(mddev->layout);
2122 sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
2124 /********************************************************************
2125 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
2127 * FEATURE_FLAG_SUPPORTS_V190 in the compat_features member indicates that those exist
2129 sb->new_level = cpu_to_le32(mddev->new_level);
2130 sb->new_layout = cpu_to_le32(mddev->new_layout);
2131 sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors);
2133 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
2135 smp_rmb(); /* Make sure we access most recent reshape position */
2136 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
2137 if (le64_to_cpu(sb->reshape_position) != MaxSector) {
2138 /* Flag ongoing reshape */
2139 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE);
2141 if (mddev->delta_disks < 0 || mddev->reshape_backwards)
2142 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS);
2144 /* Clear reshape flags */
2145 sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS));
2148 sb->array_sectors = cpu_to_le64(mddev->array_sectors);
2149 sb->data_offset = cpu_to_le64(rdev->data_offset);
2150 sb->new_data_offset = cpu_to_le64(rdev->new_data_offset);
2151 sb->sectors = cpu_to_le64(rdev->sectors);
2152 sb->incompat_features = cpu_to_le32(0);
2154 /* Zero out the rest of the payload after the size of the superblock */
2155 memset(sb + 1, 0, rdev->sb_size - sizeof(*sb));
2161 * This function creates a superblock if one is not found on the device
2162 * and will decide which superblock to use if there's a choice.
2164 * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
2166 static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
2169 struct dm_raid_superblock *sb;
2170 struct dm_raid_superblock *refsb;
2171 uint64_t events_sb, events_refsb;
2173 r = read_disk_sb(rdev, rdev->sb_size, false);
2177 sb = page_address(rdev->sb_page);
2180 * Two cases that we want to write new superblocks and rebuild:
2181 * 1) New device (no matching magic number)
2182 * 2) Device specified for rebuild (!In_sync w/ offset == 0)
2184 if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
2185 (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
2186 super_sync(rdev->mddev, rdev);
2188 set_bit(FirstUse, &rdev->flags);
2189 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
2191 /* Force writing of superblocks to disk */
2192 set_bit(MD_SB_CHANGE_DEVS, &rdev->mddev->sb_flags);
2194 /* Any superblock is better than none, choose that if given */
2195 return refdev ? 0 : 1;
2201 events_sb = le64_to_cpu(sb->events);
2203 refsb = page_address(refdev->sb_page);
2204 events_refsb = le64_to_cpu(refsb->events);
2206 return (events_sb > events_refsb) ? 1 : 0;
2209 static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
2213 struct mddev *mddev = &rs->md;
2215 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
2216 struct dm_raid_superblock *sb;
2217 uint32_t new_devs = 0, rebuild_and_new = 0, rebuilds = 0;
2219 struct dm_raid_superblock *sb2;
2221 sb = page_address(rdev->sb_page);
2222 events_sb = le64_to_cpu(sb->events);
2225 * Initialise to 1 if this is a new superblock.
2227 mddev->events = events_sb ? : 1;
2229 mddev->reshape_position = MaxSector;
2231 mddev->raid_disks = le32_to_cpu(sb->num_devices);
2232 mddev->level = le32_to_cpu(sb->level);
2233 mddev->layout = le32_to_cpu(sb->layout);
2234 mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors);
2237 * Reshaping is supported, e.g. reshape_position is valid
2238 * in superblock and superblock content is authoritative.
2240 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
2241 /* Superblock is authoritative wrt given raid set layout! */
2242 mddev->new_level = le32_to_cpu(sb->new_level);
2243 mddev->new_layout = le32_to_cpu(sb->new_layout);
2244 mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors);
2245 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
2246 mddev->array_sectors = le64_to_cpu(sb->array_sectors);
2248 /* raid was reshaping and got interrupted */
2249 if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) {
2250 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
2251 DMERR("Reshape requested but raid set is still reshaping");
2255 if (mddev->delta_disks < 0 ||
2256 (!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS)))
2257 mddev->reshape_backwards = 1;
2259 mddev->reshape_backwards = 0;
2261 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
2262 rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout);
2267 * No takeover/reshaping, because we don't have the extended v1.9.0 metadata
2269 struct raid_type *rt_cur = get_raid_type_by_ll(mddev->level, mddev->layout);
2270 struct raid_type *rt_new = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
2272 if (rs_takeover_requested(rs)) {
2273 if (rt_cur && rt_new)
2274 DMERR("Takeover raid sets from %s to %s not yet supported by metadata. (raid level change)",
2275 rt_cur->name, rt_new->name);
2277 DMERR("Takeover raid sets not yet supported by metadata. (raid level change)");
2279 } else if (rs_reshape_requested(rs)) {
2280 DMERR("Reshaping raid sets not yet supported by metadata. (raid layout change keeping level)");
2281 if (mddev->layout != mddev->new_layout) {
2282 if (rt_cur && rt_new)
2283 DMERR(" current layout %s vs new layout %s",
2284 rt_cur->name, rt_new->name);
2286 DMERR(" current layout 0x%X vs new layout 0x%X",
2287 le32_to_cpu(sb->layout), mddev->new_layout);
2289 if (mddev->chunk_sectors != mddev->new_chunk_sectors)
2290 DMERR(" current stripe sectors %u vs new stripe sectors %u",
2291 mddev->chunk_sectors, mddev->new_chunk_sectors);
2292 if (rs->delta_disks)
2293 DMERR(" current %u disks vs new %u disks",
2294 mddev->raid_disks, mddev->raid_disks + rs->delta_disks);
2295 if (rs_is_raid10(rs)) {
2296 DMERR(" Old layout: %s w/ %u copies",
2297 raid10_md_layout_to_format(mddev->layout),
2298 raid10_md_layout_to_copies(mddev->layout));
2299 DMERR(" New layout: %s w/ %u copies",
2300 raid10_md_layout_to_format(mddev->new_layout),
2301 raid10_md_layout_to_copies(mddev->new_layout));
2306 DMINFO("Discovered old metadata format; upgrading to extended metadata format");
2309 if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
2310 mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
2313 * During load, we set FirstUse if a new superblock was written.
2314 * There are two reasons we might not have a superblock:
2315 * 1) The raid set is brand new - in which case, all of the
2316 * devices must have their In_sync bit set. Also,
2317 * recovery_cp must be 0, unless forced.
2318 * 2) This is a new device being added to an old raid set
2319 * and the new device needs to be rebuilt - in which
2320 * case the In_sync bit will /not/ be set and
2321 * recovery_cp must be MaxSector.
2322 * 3) This is/are a new device(s) being added to an old
2323 * raid set during takeover to a higher raid level
2324 * to provide capacity for redundancy or during reshape
2325 * to add capacity to grow the raid set.
2328 rdev_for_each(r, mddev) {
2329 if (test_bit(Journal, &rdev->flags))
2332 if (test_bit(FirstUse, &r->flags))
2335 if (!test_bit(In_sync, &r->flags)) {
2336 DMINFO("Device %d specified for rebuild; clearing superblock",
2340 if (test_bit(FirstUse, &r->flags))
2347 if (new_devs == rs->raid_disks || !rebuilds) {
2348 /* Replace a broken device */
2349 if (new_devs == 1 && !rs->delta_disks)
2351 if (new_devs == rs->raid_disks) {
2352 DMINFO("Superblocks created for new raid set");
2353 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2354 } else if (new_devs != rebuilds &&
2355 new_devs != rs->delta_disks) {
2356 DMERR("New device injected into existing raid set without "
2357 "'delta_disks' or 'rebuild' parameter specified");
2360 } else if (new_devs && new_devs != rebuilds) {
2361 DMERR("%u 'rebuild' devices cannot be injected into"
2362 " a raid set with %u other first-time devices",
2363 rebuilds, new_devs);
2365 } else if (rebuilds) {
2366 if (rebuild_and_new && rebuilds != rebuild_and_new) {
2367 DMERR("new device%s provided without 'rebuild'",
2368 new_devs > 1 ? "s" : "");
2370 } else if (rs_is_recovering(rs)) {
2371 DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)",
2372 (unsigned long long) mddev->recovery_cp);
2374 } else if (rs_is_reshaping(rs)) {
2375 DMERR("'rebuild' specified while raid set is being reshaped (reshape_position=%llu)",
2376 (unsigned long long) mddev->reshape_position);
2382 * Now we set the Faulty bit for those devices that are
2383 * recorded in the superblock as failed.
2385 sb_retrieve_failed_devices(sb, failed_devices);
2386 rdev_for_each(r, mddev) {
2387 if (test_bit(Journal, &rdev->flags) ||
2390 sb2 = page_address(r->sb_page);
2391 sb2->failed_devices = 0;
2392 memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices));
2395 * Check for any device re-ordering.
2397 if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
2398 role = le32_to_cpu(sb2->array_position);
2402 if (role != r->raid_disk) {
2403 if (rs_is_raid10(rs) && __is_raid10_near(mddev->layout)) {
2404 if (mddev->raid_disks % __raid10_near_copies(mddev->layout) ||
2405 rs->raid_disks % rs->raid10_copies) {
2407 "Cannot change raid10 near set to odd # of devices!";
2411 sb2->array_position = cpu_to_le32(r->raid_disk);
2413 } else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) &&
2414 !(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) &&
2415 !rt_is_raid1(rs->raid_type)) {
2416 rs->ti->error = "Cannot change device positions in raid set";
2420 DMINFO("raid device #%d now at position #%d", role, r->raid_disk);
2424 * Partial recovery is performed on
2425 * returning failed devices.
2427 if (test_bit(role, (void *) failed_devices))
2428 set_bit(Faulty, &r->flags);
2435 static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
2437 struct mddev *mddev = &rs->md;
2438 struct dm_raid_superblock *sb;
2440 if (rs_is_raid0(rs) || !rdev->sb_page || rdev->raid_disk < 0)
2443 sb = page_address(rdev->sb_page);
2446 * If mddev->events is not set, we know we have not yet initialized
2449 if (!mddev->events && super_init_validation(rs, rdev))
2452 if (le32_to_cpu(sb->compat_features) &&
2453 le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
2454 rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
2458 if (sb->incompat_features) {
2459 rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet";
2463 /* Enable bitmap creation for RAID levels != 0 */
2464 mddev->bitmap_info.offset = rt_is_raid0(rs->raid_type) ? 0 : to_sector(4096);
2465 mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
2467 if (!test_and_clear_bit(FirstUse, &rdev->flags)) {
2469 * Retrieve rdev size stored in superblock to be prepared for shrink.
2470 * Check extended superblock members are present otherwise the size
2473 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190)
2474 rdev->sectors = le64_to_cpu(sb->sectors);
2476 rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
2477 if (rdev->recovery_offset == MaxSector)
2478 set_bit(In_sync, &rdev->flags);
2480 * If no reshape in progress -> we're recovering single
2481 * disk(s) and have to set the device(s) to out-of-sync
2483 else if (!rs_is_reshaping(rs))
2484 clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */
2488 * If a device comes back, set it as not In_sync and no longer faulty.
2490 if (test_and_clear_bit(Faulty, &rdev->flags)) {
2491 rdev->recovery_offset = 0;
2492 clear_bit(In_sync, &rdev->flags);
2493 rdev->saved_raid_disk = rdev->raid_disk;
2496 /* Reshape support -> restore repective data offsets */
2497 rdev->data_offset = le64_to_cpu(sb->data_offset);
2498 rdev->new_data_offset = le64_to_cpu(sb->new_data_offset);
2504 * Analyse superblocks and select the freshest.
2506 static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
2509 struct md_rdev *rdev, *freshest;
2510 struct mddev *mddev = &rs->md;
2513 rdev_for_each(rdev, mddev) {
2514 if (test_bit(Journal, &rdev->flags))
2517 if (!rdev->meta_bdev)
2520 /* Set superblock offset/size for metadata device. */
2522 rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
2523 if (rdev->sb_size < sizeof(struct dm_raid_superblock) || rdev->sb_size > PAGE_SIZE) {
2524 DMERR("superblock size of a logical block is no longer valid");
2529 * Skipping super_load due to CTR_FLAG_SYNC will cause
2530 * the array to undergo initialization again as
2531 * though it were new. This is the intended effect
2532 * of the "sync" directive.
2534 * With reshaping capability added, we must ensure that
2535 * that the "sync" directive is disallowed during the reshape.
2537 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
2540 r = super_load(rdev, freshest);
2549 /* This is a failure to read the superblock from the metadata device. */
2551 * We have to keep any raid0 data/metadata device pairs or
2552 * the MD raid0 personality will fail to start the array.
2554 if (rs_is_raid0(rs))
2558 * We keep the dm_devs to be able to emit the device tuple
2559 * properly on the table line in raid_status() (rather than
2560 * mistakenly acting as if '- -' got passed into the constructor).
2562 * The rdev has to stay on the same_set list to allow for
2563 * the attempt to restore faulty devices on second resume.
2565 rdev->raid_disk = rdev->saved_raid_disk = -1;
2574 * Validation of the freshest device provides the source of
2575 * validation for the remaining devices.
2577 rs->ti->error = "Unable to assemble array: Invalid superblocks";
2578 if (super_validate(rs, freshest))
2581 if (validate_raid_redundancy(rs)) {
2582 rs->ti->error = "Insufficient redundancy to activate array";
2586 rdev_for_each(rdev, mddev)
2587 if (!test_bit(Journal, &rdev->flags) &&
2589 super_validate(rs, rdev))
2595 * Adjust data_offset and new_data_offset on all disk members of @rs
2596 * for out of place reshaping if requested by contructor
2598 * We need free space at the beginning of each raid disk for forward
2599 * and at the end for backward reshapes which userspace has to provide
2600 * via remapping/reordering of space.
2602 static int rs_adjust_data_offsets(struct raid_set *rs)
2604 sector_t data_offset = 0, new_data_offset = 0;
2605 struct md_rdev *rdev;
2607 /* Constructor did not request data offset change */
2608 if (!test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
2609 if (!rs_is_reshapable(rs))
2615 /* HM FIXME: get InSync raid_dev? */
2616 rdev = &rs->dev[0].rdev;
2618 if (rs->delta_disks < 0) {
2620 * Removing disks (reshaping backwards):
2622 * - before reshape: data is at offset 0 and free space
2623 * is at end of each component LV
2625 * - after reshape: data is at offset rs->data_offset != 0 on each component LV
2628 new_data_offset = rs->data_offset;
2630 } else if (rs->delta_disks > 0) {
2632 * Adding disks (reshaping forwards):
2634 * - before reshape: data is at offset rs->data_offset != 0 and
2635 * free space is at begin of each component LV
2637 * - after reshape: data is at offset 0 on each component LV
2639 data_offset = rs->data_offset;
2640 new_data_offset = 0;
2644 * User space passes in 0 for data offset after having removed reshape space
2646 * - or - (data offset != 0)
2648 * Changing RAID layout or chunk size -> toggle offsets
2650 * - before reshape: data is at offset rs->data_offset 0 and
2651 * free space is at end of each component LV
2653 * data is at offset rs->data_offset != 0 and
2654 * free space is at begin of each component LV
2656 * - after reshape: data is at offset 0 if it was at offset != 0
2657 * or at offset != 0 if it was at offset 0
2658 * on each component LV
2661 data_offset = rs->data_offset ? rdev->data_offset : 0;
2662 new_data_offset = data_offset ? 0 : rs->data_offset;
2663 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2667 * Make sure we got a minimum amount of free sectors per device
2669 if (rs->data_offset &&
2670 to_sector(i_size_read(rdev->bdev->bd_inode)) - rs->md.dev_sectors < MIN_FREE_RESHAPE_SPACE) {
2671 rs->ti->error = data_offset ? "No space for forward reshape" :
2672 "No space for backward reshape";
2677 * Raise recovery_cp in case data_offset != 0 to
2678 * avoid false recovery positives in the constructor.
2680 if (rs->md.recovery_cp < rs->md.dev_sectors)
2681 rs->md.recovery_cp += rs->dev[0].rdev.data_offset;
2683 /* Adjust data offsets on all rdevs but on any raid4/5/6 journal device */
2684 rdev_for_each(rdev, &rs->md) {
2685 if (!test_bit(Journal, &rdev->flags)) {
2686 rdev->data_offset = data_offset;
2687 rdev->new_data_offset = new_data_offset;
2694 /* Userpace reordered disks -> adjust raid_disk indexes in @rs */
2695 static void __reorder_raid_disk_indexes(struct raid_set *rs)
2698 struct md_rdev *rdev;
2700 rdev_for_each(rdev, &rs->md) {
2701 if (!test_bit(Journal, &rdev->flags)) {
2702 rdev->raid_disk = i++;
2703 rdev->saved_raid_disk = rdev->new_raid_disk = -1;
2709 * Setup @rs for takeover by a different raid level
2711 static int rs_setup_takeover(struct raid_set *rs)
2713 struct mddev *mddev = &rs->md;
2714 struct md_rdev *rdev;
2715 unsigned int d = mddev->raid_disks = rs->raid_disks;
2716 sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset;
2718 if (rt_is_raid10(rs->raid_type)) {
2719 if (mddev->level == 0) {
2720 /* Userpace reordered disks -> adjust raid_disk indexes */
2721 __reorder_raid_disk_indexes(rs);
2723 /* raid0 -> raid10_far layout */
2724 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR,
2726 } else if (mddev->level == 1)
2727 /* raid1 -> raid10_near layout */
2728 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2735 clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2736 mddev->recovery_cp = MaxSector;
2739 rdev = &rs->dev[d].rdev;
2741 if (test_bit(d, (void *) rs->rebuild_disks)) {
2742 clear_bit(In_sync, &rdev->flags);
2743 clear_bit(Faulty, &rdev->flags);
2744 mddev->recovery_cp = rdev->recovery_offset = 0;
2745 /* Bitmap has to be created when we do an "up" takeover */
2746 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2749 rdev->new_data_offset = new_data_offset;
2755 /* Prepare @rs for reshape */
2756 static int rs_prepare_reshape(struct raid_set *rs)
2759 struct mddev *mddev = &rs->md;
2761 if (rs_is_raid10(rs)) {
2762 if (rs->raid_disks != mddev->raid_disks &&
2763 __is_raid10_near(mddev->layout) &&
2764 rs->raid10_copies &&
2765 rs->raid10_copies != __raid10_near_copies(mddev->layout)) {
2767 * raid disk have to be multiple of data copies to allow this conversion,
2769 * This is actually not a reshape it is a
2770 * rebuild of any additional mirrors per group
2772 if (rs->raid_disks % rs->raid10_copies) {
2773 rs->ti->error = "Can't reshape raid10 mirror groups";
2777 /* Userpace reordered disks to add/remove mirrors -> adjust raid_disk indexes */
2778 __reorder_raid_disk_indexes(rs);
2779 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2781 mddev->new_layout = mddev->layout;
2786 } else if (rs_is_raid456(rs))
2789 else if (rs_is_raid1(rs)) {
2790 if (rs->delta_disks) {
2791 /* Process raid1 via delta_disks */
2792 mddev->degraded = rs->delta_disks < 0 ? -rs->delta_disks : rs->delta_disks;
2795 /* Process raid1 without delta_disks */
2796 mddev->raid_disks = rs->raid_disks;
2800 rs->ti->error = "Called with bogus raid type";
2805 set_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags);
2806 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2807 } else if (mddev->raid_disks < rs->raid_disks)
2808 /* Create new superblocks and bitmaps, if any new disks */
2809 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2814 /* Get reshape sectors from data_offsets or raid set */
2815 static sector_t _get_reshape_sectors(struct raid_set *rs)
2817 struct md_rdev *rdev;
2818 sector_t reshape_sectors = 0;
2820 rdev_for_each(rdev, &rs->md)
2821 if (!test_bit(Journal, &rdev->flags)) {
2822 reshape_sectors = (rdev->data_offset > rdev->new_data_offset) ?
2823 rdev->data_offset - rdev->new_data_offset :
2824 rdev->new_data_offset - rdev->data_offset;
2828 return max(reshape_sectors, (sector_t) rs->data_offset);
2833 * - change raid layout
2834 * - change chunk size
2838 static int rs_setup_reshape(struct raid_set *rs)
2841 unsigned int cur_raid_devs, d;
2842 sector_t reshape_sectors = _get_reshape_sectors(rs);
2843 struct mddev *mddev = &rs->md;
2844 struct md_rdev *rdev;
2846 mddev->delta_disks = rs->delta_disks;
2847 cur_raid_devs = mddev->raid_disks;
2849 /* Ignore impossible layout change whilst adding/removing disks */
2850 if (mddev->delta_disks &&
2851 mddev->layout != mddev->new_layout) {
2852 DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks);
2853 mddev->new_layout = mddev->layout;
2857 * Adjust array size:
2859 * - in case of adding disk(s), array size has
2860 * to grow after the disk adding reshape,
2861 * which'll hapen in the event handler;
2862 * reshape will happen forward, so space has to
2863 * be available at the beginning of each disk
2865 * - in case of removing disk(s), array size
2866 * has to shrink before starting the reshape,
2867 * which'll happen here;
2868 * reshape will happen backward, so space has to
2869 * be available at the end of each disk
2871 * - data_offset and new_data_offset are
2872 * adjusted for aforementioned out of place
2873 * reshaping based on userspace passing in
2874 * the "data_offset <sectors>" key/value
2875 * pair via the constructor
2879 if (rs->delta_disks > 0) {
2880 /* Prepare disks for check in raid4/5/6/10 {check|start}_reshape */
2881 for (d = cur_raid_devs; d < rs->raid_disks; d++) {
2882 rdev = &rs->dev[d].rdev;
2883 clear_bit(In_sync, &rdev->flags);
2886 * save_raid_disk needs to be -1, or recovery_offset will be set to 0
2887 * by md, which'll store that erroneously in the superblock on reshape
2889 rdev->saved_raid_disk = -1;
2890 rdev->raid_disk = d;
2892 rdev->sectors = mddev->dev_sectors;
2893 rdev->recovery_offset = rs_is_raid1(rs) ? 0 : MaxSector;
2896 mddev->reshape_backwards = 0; /* adding disk(s) -> forward reshape */
2898 /* Remove disk(s) */
2899 } else if (rs->delta_disks < 0) {
2900 r = rs_set_dev_and_array_sectors(rs, true);
2901 mddev->reshape_backwards = 1; /* removing disk(s) -> backward reshape */
2903 /* Change layout and/or chunk size */
2906 * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size:
2908 * keeping number of disks and do layout change ->
2910 * toggle reshape_backward depending on data_offset:
2912 * - free space upfront -> reshape forward
2914 * - free space at the end -> reshape backward
2917 * This utilizes free reshape space avoiding the need
2918 * for userspace to move (parts of) LV segments in
2919 * case of layout/chunksize change (for disk
2920 * adding/removing reshape space has to be at
2921 * the proper address (see above with delta_disks):
2923 * add disk(s) -> begin
2924 * remove disk(s)-> end
2926 mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1;
2930 * Adjust device size for forward reshape
2931 * because md_finish_reshape() reduces it.
2933 if (!mddev->reshape_backwards)
2934 rdev_for_each(rdev, &rs->md)
2935 if (!test_bit(Journal, &rdev->flags))
2936 rdev->sectors += reshape_sectors;
2942 * Enable/disable discard support on RAID set depending on
2943 * RAID level and discard properties of underlying RAID members.
2945 static void configure_discard_support(struct raid_set *rs)
2949 struct dm_target *ti = rs->ti;
2952 * XXX: RAID level 4,5,6 require zeroing for safety.
2954 raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6);
2956 for (i = 0; i < rs->raid_disks; i++) {
2957 struct request_queue *q;
2959 if (!rs->dev[i].rdev.bdev)
2962 q = bdev_get_queue(rs->dev[i].rdev.bdev);
2963 if (!q || !blk_queue_discard(q))
2967 if (!devices_handle_discard_safely) {
2968 DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
2969 DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");
2976 * RAID1 and RAID10 personalities require bio splitting,
2977 * RAID0/4/5/6 don't and process large discard bios properly.
2979 ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10);
2980 ti->num_discard_bios = 1;
2984 * Construct a RAID0/1/10/4/5/6 mapping:
2986 * <raid_type> <#raid_params> <raid_params>{0,} \
2987 * <#raid_devs> [<meta_dev1> <dev1>]{1,}
2989 * <raid_params> varies by <raid_type>. See 'parse_raid_params' for
2990 * details on possible <raid_params>.
2992 * Userspace is free to initialize the metadata devices, hence the superblocks to
2993 * enforce recreation based on the passed in table parameters.
2996 static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv)
2999 bool resize = false;
3000 struct raid_type *rt;
3001 unsigned int num_raid_params, num_raid_devs;
3002 sector_t calculated_dev_sectors, rdev_sectors, reshape_sectors;
3003 struct raid_set *rs = NULL;
3005 struct rs_layout rs_layout;
3006 struct dm_arg_set as = { argc, argv }, as_nrd;
3007 struct dm_arg _args[] = {
3008 { 0, as.argc, "Cannot understand number of raid parameters" },
3009 { 1, 254, "Cannot understand number of raid devices parameters" }
3012 /* Must have <raid_type> */
3013 arg = dm_shift_arg(&as);
3015 ti->error = "No arguments";
3019 rt = get_raid_type(arg);
3021 ti->error = "Unrecognised raid_type";
3025 /* Must have <#raid_params> */
3026 if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error))
3029 /* number of raid device tupples <meta_dev data_dev> */
3031 dm_consume_args(&as_nrd, num_raid_params);
3032 _args[1].max = (as_nrd.argc - 1) / 2;
3033 if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error))
3036 if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) {
3037 ti->error = "Invalid number of supplied raid devices";
3041 rs = raid_set_alloc(ti, rt, num_raid_devs);
3045 r = parse_raid_params(rs, &as, num_raid_params);
3049 r = parse_dev_params(rs, &as);
3053 rs->md.sync_super = super_sync;
3056 * Calculate ctr requested array and device sizes to allow
3057 * for superblock analysis needing device sizes defined.
3059 * Any existing superblock will overwrite the array and device sizes
3061 r = rs_set_dev_and_array_sectors(rs, false);
3065 calculated_dev_sectors = rs->md.dev_sectors;
3068 * Backup any new raid set level, layout, ...
3069 * requested to be able to compare to superblock
3070 * members for conversion decisions.
3072 rs_config_backup(rs, &rs_layout);
3074 r = analyse_superblocks(ti, rs);
3078 rdev_sectors = __rdev_sectors(rs);
3079 if (!rdev_sectors) {
3080 ti->error = "Invalid rdev size";
3086 reshape_sectors = _get_reshape_sectors(rs);
3087 if (calculated_dev_sectors != rdev_sectors)
3088 resize = calculated_dev_sectors != (reshape_sectors ? rdev_sectors - reshape_sectors : rdev_sectors);
3090 INIT_WORK(&rs->md.event_work, do_table_event);
3092 ti->num_flush_bios = 1;
3094 /* Restore any requested new layout for conversion decision */
3095 rs_config_restore(rs, &rs_layout);
3098 * Now that we have any superblock metadata available,
3099 * check for new, recovering, reshaping, to be taken over,
3100 * to be reshaped or an existing, unchanged raid set to
3103 if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) {
3104 /* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */
3105 if (rs_is_raid6(rs) &&
3106 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
3107 ti->error = "'nosync' not allowed for new raid6 set";
3111 rs_setup_recovery(rs, 0);
3112 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3114 } else if (rs_is_recovering(rs)) {
3115 /* A recovering raid set may be resized */
3116 ; /* skip setup rs */
3117 } else if (rs_is_reshaping(rs)) {
3118 /* Have to reject size change request during reshape */
3120 ti->error = "Can't resize a reshaping raid set";
3125 } else if (rs_takeover_requested(rs)) {
3126 if (rs_is_reshaping(rs)) {
3127 ti->error = "Can't takeover a reshaping raid set";
3132 /* We can't takeover a journaled raid4/5/6 */
3133 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
3134 ti->error = "Can't takeover a journaled raid4/5/6 set";
3140 * If a takeover is needed, userspace sets any additional
3141 * devices to rebuild and we can check for a valid request here.
3143 * If acceptible, set the level to the new requested
3144 * one, prohibit requesting recovery, allow the raid
3145 * set to run and store superblocks during resume.
3147 r = rs_check_takeover(rs);
3151 r = rs_setup_takeover(rs);
3155 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3156 /* Takeover ain't recovery, so disable recovery */
3157 rs_setup_recovery(rs, MaxSector);
3159 } else if (rs_reshape_requested(rs)) {
3161 * No need to check for 'ongoing' takeover here, because takeover
3162 * is an instant operation as oposed to an ongoing reshape.
3165 /* We can't reshape a journaled raid4/5/6 */
3166 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags)) {
3167 ti->error = "Can't reshape a journaled raid4/5/6 set";
3173 * We can only prepare for a reshape here, because the
3174 * raid set needs to run to provide the repective reshape
3175 * check functions via its MD personality instance.
3177 * So do the reshape check after md_run() succeeded.
3179 r = rs_prepare_reshape(rs);
3183 /* Reshaping ain't recovery, so disable recovery */
3184 rs_setup_recovery(rs, MaxSector);
3187 /* May not set recovery when a device rebuild is requested */
3188 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) {
3189 rs_setup_recovery(rs, MaxSector);
3190 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
3192 rs_setup_recovery(rs, test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ?
3193 0 : (resize ? calculated_dev_sectors : MaxSector));
3197 /* If constructor requested it, change data and new_data offsets */
3198 r = rs_adjust_data_offsets(rs);
3202 /* Start raid set read-only and assumed clean to change in raid_resume() */
3205 set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
3207 /* Has to be held on running the array */
3208 mddev_lock_nointr(&rs->md);
3209 r = md_run(&rs->md);
3210 rs->md.in_sync = 0; /* Assume already marked dirty */
3212 ti->error = "Failed to run raid array";
3213 mddev_unlock(&rs->md);
3217 rs->callbacks.congested_fn = raid_is_congested;
3218 dm_table_add_target_callbacks(ti->table, &rs->callbacks);
3220 /* If raid4/5/6 journal mode explictely requested (only possible with journal dev) -> set it */
3221 if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags)) {
3222 r = r5c_journal_mode_set(&rs->md, rs->journal_dev.mode);
3224 ti->error = "Failed to set raid4/5/6 journal mode";
3225 mddev_unlock(&rs->md);
3226 goto bad_journal_mode_set;
3230 mddev_suspend(&rs->md);
3231 set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags);
3233 /* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
3234 if (rs_is_raid456(rs)) {
3235 r = rs_set_raid456_stripe_cache(rs);
3237 goto bad_stripe_cache;
3240 /* Now do an early reshape check */
3241 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
3242 r = rs_check_reshape(rs);
3244 goto bad_check_reshape;
3246 /* Restore new, ctr requested layout to perform check */
3247 rs_config_restore(rs, &rs_layout);
3249 if (rs->md.pers->start_reshape) {
3250 r = rs->md.pers->check_reshape(&rs->md);
3252 ti->error = "Reshape check failed";
3253 goto bad_check_reshape;
3258 /* Disable/enable discard support on raid set. */
3259 configure_discard_support(rs);
3261 mddev_unlock(&rs->md);
3264 bad_journal_mode_set:
3274 static void raid_dtr(struct dm_target *ti)
3276 struct raid_set *rs = ti->private;
3278 list_del_init(&rs->callbacks.list);
3283 static int raid_map(struct dm_target *ti, struct bio *bio)
3285 struct raid_set *rs = ti->private;
3286 struct mddev *mddev = &rs->md;
3289 * If we're reshaping to add disk(s)), ti->len and
3290 * mddev->array_sectors will differ during the process
3291 * (ti->len > mddev->array_sectors), so we have to requeue
3292 * bios with addresses > mddev->array_sectors here or
3293 * there will occur accesses past EOD of the component
3294 * data images thus erroring the raid set.
3296 if (unlikely(bio_end_sector(bio) > mddev->array_sectors))
3297 return DM_MAPIO_REQUEUE;
3299 md_handle_request(mddev, bio);
3301 return DM_MAPIO_SUBMITTED;
3304 /* Return string describing the current sync action of @mddev */
3305 static const char *decipher_sync_action(struct mddev *mddev, unsigned long recovery)
3307 if (test_bit(MD_RECOVERY_FROZEN, &recovery))
3310 /* The MD sync thread can be done with io but still be running */
3311 if (!test_bit(MD_RECOVERY_DONE, &recovery) &&
3312 (test_bit(MD_RECOVERY_RUNNING, &recovery) ||
3313 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery)))) {
3314 if (test_bit(MD_RECOVERY_RESHAPE, &recovery))
3317 if (test_bit(MD_RECOVERY_SYNC, &recovery)) {
3318 if (!test_bit(MD_RECOVERY_REQUESTED, &recovery))
3320 else if (test_bit(MD_RECOVERY_CHECK, &recovery))
3325 if (test_bit(MD_RECOVERY_RECOVER, &recovery))
3333 * Return status string for @rdev
3335 * Status characters:
3337 * 'D' = Dead/Failed raid set component or raid4/5/6 journal device
3338 * 'a' = Alive but not in-sync raid set component _or_ alive raid4/5/6 'write_back' journal device
3339 * 'A' = Alive and in-sync raid set component _or_ alive raid4/5/6 'write_through' journal device
3340 * '-' = Non-existing device (i.e. uspace passed '- -' into the ctr)
3342 static const char *__raid_dev_status(struct raid_set *rs, struct md_rdev *rdev)
3346 else if (test_bit(Faulty, &rdev->flags))
3348 else if (test_bit(Journal, &rdev->flags))
3349 return (rs->journal_dev.mode == R5C_JOURNAL_MODE_WRITE_THROUGH) ? "A" : "a";
3350 else if (test_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags) ||
3351 (!test_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags) &&
3352 !test_bit(In_sync, &rdev->flags)))
3358 /* Helper to return resync/reshape progress for @rs and runtime flags for raid set in sync / resynching */
3359 static sector_t rs_get_progress(struct raid_set *rs, unsigned long recovery,
3360 sector_t resync_max_sectors)
3363 struct mddev *mddev = &rs->md;
3365 clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3366 clear_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
3368 if (rs_is_raid0(rs)) {
3369 r = resync_max_sectors;
3370 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3373 /* Reshape is relative to the array size */
3374 if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) {
3375 r = mddev->reshape_position;
3376 if (r != MaxSector) {
3377 /* Got to reverse on backward reshape */
3378 if (mddev->reshape_backwards)
3379 r = mddev->array_sectors - r;
3381 /* Divide by # of data stripes unless raid1 */
3382 if (!rs_is_raid1(rs))
3383 sector_div(r, mddev_data_stripes(rs));
3387 * Sync/recover is relative to the component device size.
3389 * MD_RECOVERY_NEEDED for https://bugzilla.redhat.com/show_bug.cgi?id=1508070
3391 } else if (test_bit(MD_RECOVERY_NEEDED, &recovery) ||
3392 test_bit(MD_RECOVERY_RUNNING, &recovery))
3393 r = mddev->curr_resync_completed;
3396 r = mddev->recovery_cp;
3398 if (r >= resync_max_sectors &&
3399 (!test_bit(MD_RECOVERY_REQUESTED, &recovery) ||
3400 (!test_bit(MD_RECOVERY_FROZEN, &recovery) &&
3401 !test_bit(MD_RECOVERY_NEEDED, &recovery) &&
3402 !test_bit(MD_RECOVERY_RUNNING, &recovery)))) {
3406 /* In case we have finished recovering, the array is in sync. */
3407 if (test_bit(MD_RECOVERY_RECOVER, &recovery))
3408 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3410 } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) {
3412 * In case we are recovering, the array is not in sync
3413 * and health chars should show the recovering legs.
3417 } else if (test_bit(MD_RECOVERY_SYNC, &recovery) &&
3418 !test_bit(MD_RECOVERY_REQUESTED, &recovery)) {
3420 * If "resync" is occurring, the raid set
3421 * is or may be out of sync hence the health
3422 * characters shall be 'a'.
3424 set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
3426 } else if (test_bit(MD_RECOVERY_REQUESTED, &recovery)) {
3428 * If "check" or "repair" is occurring, the raid set has
3429 * undergone an initial sync and the health characters
3430 * should not be 'a' anymore.
3432 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3435 struct md_rdev *rdev;
3438 * We are idle and recovery is needed, prevent 'A' chars race
3439 * caused by components still set to in-sync by constrcuctor.
3441 if (test_bit(MD_RECOVERY_NEEDED, &recovery))
3442 set_bit(RT_FLAG_RS_RESYNCING, &rs->runtime_flags);
3445 * The raid set may be doing an initial sync, or it may
3446 * be rebuilding individual components. If all the
3447 * devices are In_sync, then it is the raid set that is
3448 * being initialized.
3450 set_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3451 rdev_for_each(rdev, mddev)
3452 if (!test_bit(Journal, &rdev->flags) &&
3453 !test_bit(In_sync, &rdev->flags)) {
3454 clear_bit(RT_FLAG_RS_IN_SYNC, &rs->runtime_flags);
3460 return min(r, resync_max_sectors);
3463 /* Helper to return @dev name or "-" if !@dev */
3464 static const char *__get_dev_name(struct dm_dev *dev)
3466 return dev ? dev->name : "-";
3469 static void raid_status(struct dm_target *ti, status_type_t type,
3470 unsigned int status_flags, char *result, unsigned int maxlen)
3472 struct raid_set *rs = ti->private;
3473 struct mddev *mddev = &rs->md;
3474 struct r5conf *conf = mddev->private;
3475 int i, max_nr_stripes = conf ? conf->max_nr_stripes : 0;
3476 unsigned long recovery;
3477 unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */
3478 unsigned int sz = 0;
3479 unsigned int rebuild_disks;
3480 unsigned int write_mostly_params = 0;
3481 sector_t progress, resync_max_sectors, resync_mismatches;
3482 const char *sync_action;
3483 struct raid_type *rt;
3486 case STATUSTYPE_INFO:
3487 /* *Should* always succeed */
3488 rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
3492 DMEMIT("%s %d ", rt->name, mddev->raid_disks);
3494 /* Access most recent mddev properties for status output */
3496 recovery = rs->md.recovery;
3497 /* Get sensible max sectors even if raid set not yet started */
3498 resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ?
3499 mddev->resync_max_sectors : mddev->dev_sectors;
3500 progress = rs_get_progress(rs, recovery, resync_max_sectors);
3501 resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ?
3502 atomic64_read(&mddev->resync_mismatches) : 0;
3503 sync_action = decipher_sync_action(&rs->md, recovery);
3505 /* HM FIXME: do we want another state char for raid0? It shows 'D'/'A'/'-' now */
3506 for (i = 0; i < rs->raid_disks; i++)
3507 DMEMIT(__raid_dev_status(rs, &rs->dev[i].rdev));
3510 * In-sync/Reshape ratio:
3511 * The in-sync ratio shows the progress of:
3512 * - Initializing the raid set
3513 * - Rebuilding a subset of devices of the raid set
3514 * The user can distinguish between the two by referring
3515 * to the status characters.
3517 * The reshape ratio shows the progress of
3518 * changing the raid layout or the number of
3519 * disks of a raid set
3521 DMEMIT(" %llu/%llu", (unsigned long long) progress,
3522 (unsigned long long) resync_max_sectors);
3528 * See Documentation/device-mapper/dm-raid.txt for
3529 * information on each of these states.
3531 DMEMIT(" %s", sync_action);
3536 * resync_mismatches/mismatch_cnt
3537 * This field shows the number of discrepancies found when
3538 * performing a "check" of the raid set.
3540 DMEMIT(" %llu", (unsigned long long) resync_mismatches);
3545 * data_offset (needed for out of space reshaping)
3546 * This field shows the data offset into the data
3547 * image LV where the first stripes data starts.
3549 * We keep data_offset equal on all raid disks of the set,
3550 * so retrieving it from the first raid disk is sufficient.
3552 DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset);
3557 DMEMIT(" %s", test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ?
3558 __raid_dev_status(rs, &rs->journal_dev.rdev) : "-");
3561 case STATUSTYPE_TABLE:
3562 /* Report the table line string you would use to construct this raid set */
3564 /* Calculate raid parameter count */
3565 for (i = 0; i < rs->raid_disks; i++)
3566 if (test_bit(WriteMostly, &rs->dev[i].rdev.flags))
3567 write_mostly_params += 2;
3568 rebuild_disks = memweight(rs->rebuild_disks, DISKS_ARRAY_ELEMS * sizeof(*rs->rebuild_disks));
3569 raid_param_cnt += rebuild_disks * 2 +
3570 write_mostly_params +
3571 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) +
3572 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2 +
3573 (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags) ? 2 : 0) +
3574 (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags) ? 2 : 0);
3576 /* Emit table line */
3577 /* This has to be in the documented order for userspace! */
3578 DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors);
3579 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
3580 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC));
3581 if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
3582 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC));
3584 for (i = 0; i < rs->raid_disks; i++)
3585 if (test_bit(rs->dev[i].rdev.raid_disk, (void *) rs->rebuild_disks))
3586 DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD),
3587 rs->dev[i].rdev.raid_disk);
3588 if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags))
3589 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP),
3590 mddev->bitmap_info.daemon_sleep);
3591 if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags))
3592 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE),
3593 mddev->sync_speed_min);
3594 if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags))
3595 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE),
3596 mddev->sync_speed_max);
3597 if (write_mostly_params)
3598 for (i = 0; i < rs->raid_disks; i++)
3599 if (test_bit(WriteMostly, &rs->dev[i].rdev.flags))
3600 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY),
3601 rs->dev[i].rdev.raid_disk);
3602 if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags))
3603 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND),
3604 mddev->bitmap_info.max_write_behind);
3605 if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags))
3606 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE),
3608 if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags))
3609 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE),
3610 (unsigned long long) to_sector(mddev->bitmap_info.chunksize));
3611 if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags))
3612 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES),
3613 raid10_md_layout_to_copies(mddev->layout));
3614 if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags))
3615 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT),
3616 raid10_md_layout_to_format(mddev->layout));
3617 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags))
3618 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS),
3619 max(rs->delta_disks, mddev->delta_disks));
3620 if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags))
3621 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET),
3622 (unsigned long long) rs->data_offset);
3623 if (test_bit(__CTR_FLAG_JOURNAL_DEV, &rs->ctr_flags))
3624 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_DEV),
3625 __get_dev_name(rs->journal_dev.dev));
3626 if (test_bit(__CTR_FLAG_JOURNAL_MODE, &rs->ctr_flags))
3627 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_JOURNAL_MODE),
3628 md_journal_mode_to_dm_raid(rs->journal_dev.mode));
3629 DMEMIT(" %d", rs->raid_disks);
3630 for (i = 0; i < rs->raid_disks; i++)
3631 DMEMIT(" %s %s", __get_dev_name(rs->dev[i].meta_dev),
3632 __get_dev_name(rs->dev[i].data_dev));
3636 static int raid_message(struct dm_target *ti, unsigned int argc, char **argv)
3638 struct raid_set *rs = ti->private;
3639 struct mddev *mddev = &rs->md;
3641 if (!mddev->pers || !mddev->pers->sync_request)
3644 if (!strcasecmp(argv[0], "frozen"))
3645 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3647 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3649 if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) {
3650 if (mddev->sync_thread) {
3651 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3652 md_reap_sync_thread(mddev);
3654 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3655 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3657 else if (!strcasecmp(argv[0], "resync"))
3658 ; /* MD_RECOVERY_NEEDED set below */
3659 else if (!strcasecmp(argv[0], "recover"))
3660 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3662 if (!strcasecmp(argv[0], "check")) {
3663 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3664 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3665 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3666 } else if (!strcasecmp(argv[0], "repair")) {
3667 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3668 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3672 if (mddev->ro == 2) {
3673 /* A write to sync_action is enough to justify
3674 * canceling read-auto mode
3677 if (!mddev->suspended && mddev->sync_thread)
3678 md_wakeup_thread(mddev->sync_thread);
3680 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3681 if (!mddev->suspended && mddev->thread)
3682 md_wakeup_thread(mddev->thread);
3687 static int raid_iterate_devices(struct dm_target *ti,
3688 iterate_devices_callout_fn fn, void *data)
3690 struct raid_set *rs = ti->private;
3694 for (i = 0; !r && i < rs->md.raid_disks; i++)
3695 if (rs->dev[i].data_dev)
3697 rs->dev[i].data_dev,
3698 0, /* No offset on data devs */
3705 static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
3707 struct raid_set *rs = ti->private;
3708 unsigned int chunk_size = to_bytes(rs->md.chunk_sectors);
3710 blk_limits_io_min(limits, chunk_size);
3711 blk_limits_io_opt(limits, chunk_size * mddev_data_stripes(rs));
3714 static void raid_postsuspend(struct dm_target *ti)
3716 struct raid_set *rs = ti->private;
3718 if (!test_and_set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) {
3719 /* Writes have to be stopped before suspending to avoid deadlocks. */
3720 if (!test_bit(MD_RECOVERY_FROZEN, &rs->md.recovery))
3721 md_stop_writes(&rs->md);
3723 mddev_lock_nointr(&rs->md);
3724 mddev_suspend(&rs->md);
3725 mddev_unlock(&rs->md);
3729 static void attempt_restore_of_faulty_devices(struct raid_set *rs)
3732 uint64_t cleared_failed_devices[DISKS_ARRAY_ELEMS];
3733 unsigned long flags;
3734 bool cleared = false;
3735 struct dm_raid_superblock *sb;
3736 struct mddev *mddev = &rs->md;
3739 /* RAID personalities have to provide hot add/remove methods or we need to bail out. */
3740 if (!mddev->pers || !mddev->pers->hot_add_disk || !mddev->pers->hot_remove_disk)
3743 memset(cleared_failed_devices, 0, sizeof(cleared_failed_devices));
3745 for (i = 0; i < mddev->raid_disks; i++) {
3746 r = &rs->dev[i].rdev;
3747 /* HM FIXME: enhance journal device recovery processing */
3748 if (test_bit(Journal, &r->flags))
3751 if (test_bit(Faulty, &r->flags) &&
3752 r->meta_bdev && !read_disk_sb(r, r->sb_size, true)) {
3753 DMINFO("Faulty %s device #%d has readable super block."
3754 " Attempting to revive it.",
3755 rs->raid_type->name, i);
3758 * Faulty bit may be set, but sometimes the array can
3759 * be suspended before the personalities can respond
3760 * by removing the device from the array (i.e. calling
3761 * 'hot_remove_disk'). If they haven't yet removed
3762 * the failed device, its 'raid_disk' number will be
3763 * '>= 0' - meaning we must call this function
3767 clear_bit(In_sync, &r->flags); /* Mandatory for hot remove. */
3768 if (r->raid_disk >= 0) {
3769 if (mddev->pers->hot_remove_disk(mddev, r)) {
3770 /* Failed to revive this device, try next */
3775 r->raid_disk = r->saved_raid_disk = i;
3777 clear_bit(Faulty, &r->flags);
3778 clear_bit(WriteErrorSeen, &r->flags);
3780 if (mddev->pers->hot_add_disk(mddev, r)) {
3781 /* Failed to revive this device, try next */
3782 r->raid_disk = r->saved_raid_disk = -1;
3785 clear_bit(In_sync, &r->flags);
3786 r->recovery_offset = 0;
3787 set_bit(i, (void *) cleared_failed_devices);
3793 /* If any failed devices could be cleared, update all sbs failed_devices bits */
3795 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
3797 rdev_for_each(r, &rs->md) {
3798 if (test_bit(Journal, &r->flags))
3801 sb = page_address(r->sb_page);
3802 sb_retrieve_failed_devices(sb, failed_devices);
3804 for (i = 0; i < DISKS_ARRAY_ELEMS; i++)
3805 failed_devices[i] &= ~cleared_failed_devices[i];
3807 sb_update_failed_devices(sb, failed_devices);
3812 static int __load_dirty_region_bitmap(struct raid_set *rs)
3816 /* Try loading the bitmap unless "raid0", which does not have one */
3817 if (!rs_is_raid0(rs) &&
3818 !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) {
3819 r = bitmap_load(&rs->md);
3821 DMERR("Failed to load bitmap");
3827 /* Enforce updating all superblocks */
3828 static void rs_update_sbs(struct raid_set *rs)
3830 struct mddev *mddev = &rs->md;
3833 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
3835 md_update_sb(mddev, 1);
3840 * Reshape changes raid algorithm of @rs to new one within personality
3841 * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes
3842 * disks from a raid set thus growing/shrinking it or resizes the set
3844 * Call mddev_lock_nointr() before!
3846 static int rs_start_reshape(struct raid_set *rs)
3849 struct mddev *mddev = &rs->md;
3850 struct md_personality *pers = mddev->pers;
3852 r = rs_setup_reshape(rs);
3856 /* Need to be resumed to be able to start reshape, recovery is frozen until raid_resume() though */
3857 if (test_and_clear_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags))
3858 mddev_resume(mddev);
3861 * Check any reshape constraints enforced by the personalility
3863 * May as well already kick the reshape off so that * pers->start_reshape() becomes optional.
3865 r = pers->check_reshape(mddev);
3867 rs->ti->error = "pers->check_reshape() failed";
3872 * Personality may not provide start reshape method in which
3873 * case check_reshape above has already covered everything
3875 if (pers->start_reshape) {
3876 r = pers->start_reshape(mddev);
3878 rs->ti->error = "pers->start_reshape() failed";
3883 /* Suspend because a resume will happen in raid_resume() */
3884 set_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags);
3885 mddev_suspend(mddev);
3888 * Now reshape got set up, update superblocks to
3889 * reflect the fact so that a table reload will
3890 * access proper superblock content in the ctr.
3897 static int raid_preresume(struct dm_target *ti)
3900 struct raid_set *rs = ti->private;
3901 struct mddev *mddev = &rs->md;
3903 /* This is a resume after a suspend of the set -> it's already started */
3904 if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags))
3908 * The superblocks need to be updated on disk if the
3909 * array is new or new devices got added (thus zeroed
3910 * out by userspace) or __load_dirty_region_bitmap
3911 * will overwrite them in core with old data or fail.
3913 if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags))
3916 /* Load the bitmap from disk unless raid0 */
3917 r = __load_dirty_region_bitmap(rs);
3921 /* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) */
3922 if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) && mddev->bitmap &&
3923 mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)) {
3924 r = bitmap_resize(mddev->bitmap, mddev->dev_sectors,
3925 to_bytes(rs->requested_bitmap_chunk_sectors), 0);
3927 DMERR("Failed to resize bitmap");
3930 /* Check for any resize/reshape on @rs and adjust/initiate */
3931 /* Be prepared for mddev_resume() in raid_resume() */
3932 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3933 if (mddev->recovery_cp && mddev->recovery_cp < MaxSector) {
3934 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3935 mddev->resync_min = mddev->recovery_cp;
3938 /* Check for any reshape request unless new raid set */
3939 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
3940 /* Initiate a reshape. */
3941 rs_set_rdev_sectors(rs);
3942 mddev_lock_nointr(mddev);
3943 r = rs_start_reshape(rs);
3944 mddev_unlock(mddev);
3946 DMWARN("Failed to check/start reshape, continuing without change");
3953 static void raid_resume(struct dm_target *ti)
3955 struct raid_set *rs = ti->private;
3956 struct mddev *mddev = &rs->md;
3958 if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) {
3960 * A secondary resume while the device is active.
3961 * Take this opportunity to check whether any failed
3962 * devices are reachable again.
3964 attempt_restore_of_faulty_devices(rs);
3970 /* Only reduce raid set size before running a disk removing reshape. */
3971 if (mddev->delta_disks < 0)
3972 rs_set_capacity(rs);
3975 * Keep the RAID set frozen if reshape/rebuild flags are set.
3976 * The RAID set is unfrozen once the next table load/resume,
3977 * which clears the reshape/rebuild flags, occurs.
3978 * This ensures that the constructor for the inactive table
3979 * retrieves an up-to-date reshape_position.
3981 if (!test_and_clear_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags) &&
3982 !(rs->ctr_flags & RESUME_STAY_FROZEN_FLAGS)) {
3983 if (rs_is_reshapable(rs)) {
3984 if (!rs_is_reshaping(rs) || _get_reshape_sectors(rs))
3985 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3987 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3990 if (test_and_clear_bit(RT_FLAG_RS_SUSPENDED, &rs->runtime_flags)) {
3991 mddev_lock_nointr(mddev);
3992 mddev_resume(mddev);
3993 mddev_unlock(mddev);
3997 static struct target_type raid_target = {
3999 .version = {1, 13, 0},
4000 .module = THIS_MODULE,
4004 .status = raid_status,
4005 .message = raid_message,
4006 .iterate_devices = raid_iterate_devices,
4007 .io_hints = raid_io_hints,
4008 .postsuspend = raid_postsuspend,
4009 .preresume = raid_preresume,
4010 .resume = raid_resume,
4013 static int __init dm_raid_init(void)
4015 DMINFO("Loading target version %u.%u.%u",
4016 raid_target.version[0],
4017 raid_target.version[1],
4018 raid_target.version[2]);
4019 return dm_register_target(&raid_target);
4022 static void __exit dm_raid_exit(void)
4024 dm_unregister_target(&raid_target);
4027 module_init(dm_raid_init);
4028 module_exit(dm_raid_exit);
4030 module_param(devices_handle_discard_safely, bool, 0644);
4031 MODULE_PARM_DESC(devices_handle_discard_safely,
4032 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
4034 MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target");
4035 MODULE_ALIAS("dm-raid0");
4036 MODULE_ALIAS("dm-raid1");
4037 MODULE_ALIAS("dm-raid10");
4038 MODULE_ALIAS("dm-raid4");
4039 MODULE_ALIAS("dm-raid5");
4040 MODULE_ALIAS("dm-raid6");
4041 MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
4042 MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>");
4043 MODULE_LICENSE("GPL");