dm-raid.c 118 KB

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