1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 md.h : kernel internal structure of the Linux MD driver 4 Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman 5 6 */ 7 8 #ifndef _MD_MD_H 9 #define _MD_MD_H 10 11 #include <linux/blkdev.h> 12 #include <linux/backing-dev.h> 13 #include <linux/badblocks.h> 14 #include <linux/kobject.h> 15 #include <linux/list.h> 16 #include <linux/mm.h> 17 #include <linux/mutex.h> 18 #include <linux/timer.h> 19 #include <linux/wait.h> 20 #include <linux/workqueue.h> 21 #include "md-cluster.h" 22 23 #define MaxSector (~(sector_t)0) 24 25 /* 26 * These flags should really be called "NO_RETRY" rather than 27 * "FAILFAST" because they don't make any promise about time lapse, 28 * only about the number of retries, which will be zero. 29 * REQ_FAILFAST_DRIVER is not included because 30 * Commit: 4a27446f3e39 ("[SCSI] modify scsi to handle new fail fast flags.") 31 * seems to suggest that the errors it avoids retrying should usually 32 * be retried. 33 */ 34 #define MD_FAILFAST (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT) 35 36 /* 37 * The struct embedded in rdev is used to serialize IO. 38 */ 39 struct serial_in_rdev { 40 struct rb_root_cached serial_rb; 41 spinlock_t serial_lock; 42 wait_queue_head_t serial_io_wait; 43 }; 44 45 /* 46 * MD's 'extended' device 47 */ 48 struct md_rdev { 49 struct list_head same_set; /* RAID devices within the same set */ 50 51 sector_t sectors; /* Device size (in 512bytes sectors) */ 52 struct mddev *mddev; /* RAID array if running */ 53 int last_events; /* IO event timestamp */ 54 55 /* 56 * If meta_bdev is non-NULL, it means that a separate device is 57 * being used to store the metadata (superblock/bitmap) which 58 * would otherwise be contained on the same device as the data (bdev). 59 */ 60 struct block_device *meta_bdev; 61 struct block_device *bdev; /* block device handle */ 62 63 struct page *sb_page, *bb_page; 64 int sb_loaded; 65 __u64 sb_events; 66 sector_t data_offset; /* start of data in array */ 67 sector_t new_data_offset;/* only relevant while reshaping */ 68 sector_t sb_start; /* offset of the super block (in 512byte sectors) */ 69 int sb_size; /* bytes in the superblock */ 70 int preferred_minor; /* autorun support */ 71 72 struct kobject kobj; 73 74 /* A device can be in one of three states based on two flags: 75 * Not working: faulty==1 in_sync==0 76 * Fully working: faulty==0 in_sync==1 77 * Working, but not 78 * in sync with array 79 * faulty==0 in_sync==0 80 * 81 * It can never have faulty==1, in_sync==1 82 * This reduces the burden of testing multiple flags in many cases 83 */ 84 85 unsigned long flags; /* bit set of 'enum flag_bits' bits. */ 86 wait_queue_head_t blocked_wait; 87 88 int desc_nr; /* descriptor index in the superblock */ 89 int raid_disk; /* role of device in array */ 90 int new_raid_disk; /* role that the device will have in 91 * the array after a level-change completes. 92 */ 93 int saved_raid_disk; /* role that device used to have in the 94 * array and could again if we did a partial 95 * resync from the bitmap 96 */ 97 union { 98 sector_t recovery_offset;/* If this device has been partially 99 * recovered, this is where we were 100 * up to. 101 */ 102 sector_t journal_tail; /* If this device is a journal device, 103 * this is the journal tail (journal 104 * recovery start point) 105 */ 106 }; 107 108 atomic_t nr_pending; /* number of pending requests. 109 * only maintained for arrays that 110 * support hot removal 111 */ 112 atomic_t read_errors; /* number of consecutive read errors that 113 * we have tried to ignore. 114 */ 115 time64_t last_read_error; /* monotonic time since our 116 * last read error 117 */ 118 atomic_t corrected_errors; /* number of corrected read errors, 119 * for reporting to userspace and storing 120 * in superblock. 121 */ 122 123 struct serial_in_rdev *serial; /* used for raid1 io serialization */ 124 125 struct kernfs_node *sysfs_state; /* handle for 'state' 126 * sysfs entry */ 127 /* handle for 'unacknowledged_bad_blocks' sysfs dentry */ 128 struct kernfs_node *sysfs_unack_badblocks; 129 /* handle for 'bad_blocks' sysfs dentry */ 130 struct kernfs_node *sysfs_badblocks; 131 struct badblocks badblocks; 132 133 struct { 134 short offset; /* Offset from superblock to start of PPL. 135 * Not used by external metadata. */ 136 unsigned int size; /* Size in sectors of the PPL space */ 137 sector_t sector; /* First sector of the PPL space */ 138 } ppl; 139 }; 140 enum flag_bits { 141 Faulty, /* device is known to have a fault */ 142 In_sync, /* device is in_sync with rest of array */ 143 Bitmap_sync, /* ..actually, not quite In_sync. Need a 144 * bitmap-based recovery to get fully in sync. 145 * The bit is only meaningful before device 146 * has been passed to pers->hot_add_disk. 147 */ 148 WriteMostly, /* Avoid reading if at all possible */ 149 AutoDetected, /* added by auto-detect */ 150 Blocked, /* An error occurred but has not yet 151 * been acknowledged by the metadata 152 * handler, so don't allow writes 153 * until it is cleared */ 154 WriteErrorSeen, /* A write error has been seen on this 155 * device 156 */ 157 FaultRecorded, /* Intermediate state for clearing 158 * Blocked. The Fault is/will-be 159 * recorded in the metadata, but that 160 * metadata hasn't been stored safely 161 * on disk yet. 162 */ 163 BlockedBadBlocks, /* A writer is blocked because they 164 * found an unacknowledged bad-block. 165 * This can safely be cleared at any 166 * time, and the writer will re-check. 167 * It may be set at any time, and at 168 * worst the writer will timeout and 169 * re-check. So setting it as 170 * accurately as possible is good, but 171 * not absolutely critical. 172 */ 173 WantReplacement, /* This device is a candidate to be 174 * hot-replaced, either because it has 175 * reported some faults, or because 176 * of explicit request. 177 */ 178 Replacement, /* This device is a replacement for 179 * a want_replacement device with same 180 * raid_disk number. 181 */ 182 Candidate, /* For clustered environments only: 183 * This device is seen locally but not 184 * by the whole cluster 185 */ 186 Journal, /* This device is used as journal for 187 * raid-5/6. 188 * Usually, this device should be faster 189 * than other devices in the array 190 */ 191 ClusterRemove, 192 RemoveSynchronized, /* synchronize_rcu() was called after 193 * this device was known to be faulty, 194 * so it is safe to remove without 195 * another synchronize_rcu() call. 196 */ 197 ExternalBbl, /* External metadata provides bad 198 * block management for a disk 199 */ 200 FailFast, /* Minimal retries should be attempted on 201 * this device, so use REQ_FAILFAST_DEV. 202 * Also don't try to repair failed reads. 203 * It is expects that no bad block log 204 * is present. 205 */ 206 LastDev, /* Seems to be the last working dev as 207 * it didn't fail, so don't use FailFast 208 * any more for metadata 209 */ 210 CollisionCheck, /* 211 * check if there is collision between raid1 212 * serial bios. 213 */ 214 Holder, /* rdev is used as holder while opening 215 * underlying disk exclusively. 216 */ 217 }; 218 219 static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, 220 sector_t *first_bad, int *bad_sectors) 221 { 222 if (unlikely(rdev->badblocks.count)) { 223 int rv = badblocks_check(&rdev->badblocks, rdev->data_offset + s, 224 sectors, 225 first_bad, bad_sectors); 226 if (rv) 227 *first_bad -= rdev->data_offset; 228 return rv; 229 } 230 return 0; 231 } 232 extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 233 int is_new); 234 extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 235 int is_new); 236 struct md_cluster_info; 237 238 /** 239 * enum mddev_flags - md device flags. 240 * @MD_ARRAY_FIRST_USE: First use of array, needs initialization. 241 * @MD_CLOSING: If set, we are closing the array, do not open it then. 242 * @MD_JOURNAL_CLEAN: A raid with journal is already clean. 243 * @MD_HAS_JOURNAL: The raid array has journal feature set. 244 * @MD_CLUSTER_RESYNC_LOCKED: cluster raid only, which means node, already took 245 * resync lock, need to release the lock. 246 * @MD_FAILFAST_SUPPORTED: Using MD_FAILFAST on metadata writes is supported as 247 * calls to md_error() will never cause the array to 248 * become failed. 249 * @MD_HAS_PPL: The raid array has PPL feature set. 250 * @MD_HAS_MULTIPLE_PPLS: The raid array has multiple PPLs feature set. 251 * @MD_ALLOW_SB_UPDATE: md_check_recovery is allowed to update the metadata 252 * without taking reconfig_mutex. 253 * @MD_UPDATING_SB: md_check_recovery is updating the metadata without 254 * explicitly holding reconfig_mutex. 255 * @MD_NOT_READY: do_md_run() is active, so 'array_state', ust not report that 256 * array is ready yet. 257 * @MD_BROKEN: This is used to stop writes and mark array as failed. 258 * @MD_DELETED: This device is being deleted 259 * 260 * change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added 261 */ 262 enum mddev_flags { 263 MD_ARRAY_FIRST_USE, 264 MD_CLOSING, 265 MD_JOURNAL_CLEAN, 266 MD_HAS_JOURNAL, 267 MD_CLUSTER_RESYNC_LOCKED, 268 MD_FAILFAST_SUPPORTED, 269 MD_HAS_PPL, 270 MD_HAS_MULTIPLE_PPLS, 271 MD_ALLOW_SB_UPDATE, 272 MD_UPDATING_SB, 273 MD_NOT_READY, 274 MD_BROKEN, 275 MD_DELETED, 276 }; 277 278 enum mddev_sb_flags { 279 MD_SB_CHANGE_DEVS, /* Some device status has changed */ 280 MD_SB_CHANGE_CLEAN, /* transition to or from 'clean' */ 281 MD_SB_CHANGE_PENDING, /* switch from 'clean' to 'active' in progress */ 282 MD_SB_NEED_REWRITE, /* metadata write needs to be repeated */ 283 }; 284 285 #define NR_SERIAL_INFOS 8 286 /* record current range of serialize IOs */ 287 struct serial_info { 288 struct rb_node node; 289 sector_t start; /* start sector of rb node */ 290 sector_t last; /* end sector of rb node */ 291 sector_t _subtree_last; /* highest sector in subtree of rb node */ 292 }; 293 294 /* 295 * mddev->curr_resync stores the current sector of the resync but 296 * also has some overloaded values. 297 */ 298 enum { 299 /* No resync in progress */ 300 MD_RESYNC_NONE = 0, 301 /* Yielded to allow another conflicting resync to commence */ 302 MD_RESYNC_YIELDED = 1, 303 /* Delayed to check that there is no conflict with another sync */ 304 MD_RESYNC_DELAYED = 2, 305 /* Any value greater than or equal to this is in an active resync */ 306 MD_RESYNC_ACTIVE = 3, 307 }; 308 309 struct mddev { 310 void *private; 311 struct md_personality *pers; 312 dev_t unit; 313 int md_minor; 314 struct list_head disks; 315 unsigned long flags; 316 unsigned long sb_flags; 317 318 int suspended; 319 struct percpu_ref active_io; 320 int ro; 321 int sysfs_active; /* set when sysfs deletes 322 * are happening, so run/ 323 * takeover/stop are not safe 324 */ 325 struct gendisk *gendisk; 326 327 struct kobject kobj; 328 int hold_active; 329 #define UNTIL_IOCTL 1 330 #define UNTIL_STOP 2 331 332 /* Superblock information */ 333 int major_version, 334 minor_version, 335 patch_version; 336 int persistent; 337 int external; /* metadata is 338 * managed externally */ 339 char metadata_type[17]; /* externally set*/ 340 int chunk_sectors; 341 time64_t ctime, utime; 342 int level, layout; 343 char clevel[16]; 344 int raid_disks; 345 int max_disks; 346 sector_t dev_sectors; /* used size of 347 * component devices */ 348 sector_t array_sectors; /* exported array size */ 349 int external_size; /* size managed 350 * externally */ 351 __u64 events; 352 /* If the last 'event' was simply a clean->dirty transition, and 353 * we didn't write it to the spares, then it is safe and simple 354 * to just decrement the event count on a dirty->clean transition. 355 * So we record that possibility here. 356 */ 357 int can_decrease_events; 358 359 char uuid[16]; 360 361 /* If the array is being reshaped, we need to record the 362 * new shape and an indication of where we are up to. 363 * This is written to the superblock. 364 * If reshape_position is MaxSector, then no reshape is happening (yet). 365 */ 366 sector_t reshape_position; 367 int delta_disks, new_level, new_layout; 368 int new_chunk_sectors; 369 int reshape_backwards; 370 371 struct md_thread __rcu *thread; /* management thread */ 372 struct md_thread __rcu *sync_thread; /* doing resync or reconstruct */ 373 374 /* 'last_sync_action' is initialized to "none". It is set when a 375 * sync operation (i.e "data-check", "requested-resync", "resync", 376 * "recovery", or "reshape") is started. It holds this value even 377 * when the sync thread is "frozen" (interrupted) or "idle" (stopped 378 * or finished). It is overwritten when a new sync operation is begun. 379 */ 380 char *last_sync_action; 381 sector_t curr_resync; /* last block scheduled */ 382 /* As resync requests can complete out of order, we cannot easily track 383 * how much resync has been completed. So we occasionally pause until 384 * everything completes, then set curr_resync_completed to curr_resync. 385 * As such it may be well behind the real resync mark, but it is a value 386 * we are certain of. 387 */ 388 sector_t curr_resync_completed; 389 unsigned long resync_mark; /* a recent timestamp */ 390 sector_t resync_mark_cnt;/* blocks written at resync_mark */ 391 sector_t curr_mark_cnt; /* blocks scheduled now */ 392 393 sector_t resync_max_sectors; /* may be set by personality */ 394 395 atomic64_t resync_mismatches; /* count of sectors where 396 * parity/replica mismatch found 397 */ 398 399 /* allow user-space to request suspension of IO to regions of the array */ 400 sector_t suspend_lo; 401 sector_t suspend_hi; 402 /* if zero, use the system-wide default */ 403 int sync_speed_min; 404 int sync_speed_max; 405 406 /* resync even though the same disks are shared among md-devices */ 407 int parallel_resync; 408 409 int ok_start_degraded; 410 411 unsigned long recovery; 412 /* If a RAID personality determines that recovery (of a particular 413 * device) will fail due to a read error on the source device, it 414 * takes a copy of this number and does not attempt recovery again 415 * until this number changes. 416 */ 417 int recovery_disabled; 418 419 int in_sync; /* know to not need resync */ 420 /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so 421 * that we are never stopping an array while it is open. 422 * 'reconfig_mutex' protects all other reconfiguration. 423 * These locks are separate due to conflicting interactions 424 * with disk->open_mutex. 425 * Lock ordering is: 426 * reconfig_mutex -> disk->open_mutex 427 * disk->open_mutex -> open_mutex: e.g. __blkdev_get -> md_open 428 */ 429 struct mutex open_mutex; 430 struct mutex reconfig_mutex; 431 atomic_t active; /* general refcount */ 432 atomic_t openers; /* number of active opens */ 433 434 int changed; /* True if we might need to 435 * reread partition info */ 436 int degraded; /* whether md should consider 437 * adding a spare 438 */ 439 440 atomic_t recovery_active; /* blocks scheduled, but not written */ 441 wait_queue_head_t recovery_wait; 442 sector_t recovery_cp; 443 sector_t resync_min; /* user requested sync 444 * starts here */ 445 sector_t resync_max; /* resync should pause 446 * when it gets here */ 447 448 struct kernfs_node *sysfs_state; /* handle for 'array_state' 449 * file in sysfs. 450 */ 451 struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ 452 struct kernfs_node *sysfs_completed; /*handle for 'sync_completed' */ 453 struct kernfs_node *sysfs_degraded; /*handle for 'degraded' */ 454 struct kernfs_node *sysfs_level; /*handle for 'level' */ 455 456 /* used for delayed sysfs removal */ 457 struct work_struct del_work; 458 /* used for register new sync thread */ 459 struct work_struct sync_work; 460 461 /* "lock" protects: 462 * flush_bio transition from NULL to !NULL 463 * rdev superblocks, events 464 * clearing MD_CHANGE_* 465 * in_sync - and related safemode and MD_CHANGE changes 466 * pers (also protected by reconfig_mutex and pending IO). 467 * clearing ->bitmap 468 * clearing ->bitmap_info.file 469 * changing ->resync_{min,max} 470 * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max}) 471 */ 472 spinlock_t lock; 473 wait_queue_head_t sb_wait; /* for waiting on superblock updates */ 474 atomic_t pending_writes; /* number of active superblock writes */ 475 476 unsigned int safemode; /* if set, update "clean" superblock 477 * when no writes pending. 478 */ 479 unsigned int safemode_delay; 480 struct timer_list safemode_timer; 481 struct percpu_ref writes_pending; 482 int sync_checkers; /* # of threads checking writes_pending */ 483 struct request_queue *queue; /* for plugging ... */ 484 485 struct bitmap *bitmap; /* the bitmap for the device */ 486 struct { 487 struct file *file; /* the bitmap file */ 488 loff_t offset; /* offset from superblock of 489 * start of bitmap. May be 490 * negative, but not '0' 491 * For external metadata, offset 492 * from start of device. 493 */ 494 unsigned long space; /* space available at this offset */ 495 loff_t default_offset; /* this is the offset to use when 496 * hot-adding a bitmap. It should 497 * eventually be settable by sysfs. 498 */ 499 unsigned long default_space; /* space available at 500 * default offset */ 501 struct mutex mutex; 502 unsigned long chunksize; 503 unsigned long daemon_sleep; /* how many jiffies between updates? */ 504 unsigned long max_write_behind; /* write-behind mode */ 505 int external; 506 int nodes; /* Maximum number of nodes in the cluster */ 507 char cluster_name[64]; /* Name of the cluster */ 508 } bitmap_info; 509 510 atomic_t max_corr_read_errors; /* max read retries */ 511 struct list_head all_mddevs; 512 513 const struct attribute_group *to_remove; 514 515 struct bio_set bio_set; 516 struct bio_set sync_set; /* for sync operations like 517 * metadata and bitmap writes 518 */ 519 struct bio_set io_clone_set; 520 521 /* Generic flush handling. 522 * The last to finish preflush schedules a worker to submit 523 * the rest of the request (without the REQ_PREFLUSH flag). 524 */ 525 struct bio *flush_bio; 526 atomic_t flush_pending; 527 ktime_t start_flush, prev_flush_start; /* prev_flush_start is when the previous completed 528 * flush was started. 529 */ 530 struct work_struct flush_work; 531 struct work_struct event_work; /* used by dm to report failure event */ 532 mempool_t *serial_info_pool; 533 void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); 534 struct md_cluster_info *cluster_info; 535 unsigned int good_device_nr; /* good device num within cluster raid */ 536 unsigned int noio_flag; /* for memalloc scope API */ 537 538 /* 539 * Temporarily store rdev that will be finally removed when 540 * reconfig_mutex is unlocked, protected by reconfig_mutex. 541 */ 542 struct list_head deleting; 543 544 /* Used to synchronize idle and frozen for action_store() */ 545 struct mutex sync_mutex; 546 /* The sequence number for sync thread */ 547 atomic_t sync_seq; 548 549 bool has_superblocks:1; 550 bool fail_last_dev:1; 551 bool serialize_policy:1; 552 }; 553 554 enum recovery_flags { 555 /* 556 * If neither SYNC or RESHAPE are set, then it is a recovery. 557 */ 558 MD_RECOVERY_RUNNING, /* a thread is running, or about to be started */ 559 MD_RECOVERY_SYNC, /* actually doing a resync, not a recovery */ 560 MD_RECOVERY_RECOVER, /* doing recovery, or need to try it. */ 561 MD_RECOVERY_INTR, /* resync needs to be aborted for some reason */ 562 MD_RECOVERY_DONE, /* thread is done and is waiting to be reaped */ 563 MD_RECOVERY_NEEDED, /* we might need to start a resync/recover */ 564 MD_RECOVERY_REQUESTED, /* user-space has requested a sync (used with SYNC) */ 565 MD_RECOVERY_CHECK, /* user-space request for check-only, no repair */ 566 MD_RECOVERY_RESHAPE, /* A reshape is happening */ 567 MD_RECOVERY_FROZEN, /* User request to abort, and not restart, any action */ 568 MD_RECOVERY_ERROR, /* sync-action interrupted because io-error */ 569 MD_RECOVERY_WAIT, /* waiting for pers->start() to finish */ 570 MD_RESYNCING_REMOTE, /* remote node is running resync thread */ 571 }; 572 573 enum md_ro_state { 574 MD_RDWR, 575 MD_RDONLY, 576 MD_AUTO_READ, 577 MD_MAX_STATE 578 }; 579 580 static inline bool md_is_rdwr(struct mddev *mddev) 581 { 582 return (mddev->ro == MD_RDWR); 583 } 584 585 static inline bool is_md_suspended(struct mddev *mddev) 586 { 587 return percpu_ref_is_dying(&mddev->active_io); 588 } 589 590 static inline int __must_check mddev_lock(struct mddev *mddev) 591 { 592 return mutex_lock_interruptible(&mddev->reconfig_mutex); 593 } 594 595 /* Sometimes we need to take the lock in a situation where 596 * failure due to interrupts is not acceptable. 597 */ 598 static inline void mddev_lock_nointr(struct mddev *mddev) 599 { 600 mutex_lock(&mddev->reconfig_mutex); 601 } 602 603 static inline int mddev_trylock(struct mddev *mddev) 604 { 605 return mutex_trylock(&mddev->reconfig_mutex); 606 } 607 extern void mddev_unlock(struct mddev *mddev); 608 609 static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) 610 { 611 atomic_add(nr_sectors, &bdev->bd_disk->sync_io); 612 } 613 614 static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) 615 { 616 md_sync_acct(bio->bi_bdev, nr_sectors); 617 } 618 619 struct md_personality 620 { 621 char *name; 622 int level; 623 struct list_head list; 624 struct module *owner; 625 bool __must_check (*make_request)(struct mddev *mddev, struct bio *bio); 626 /* 627 * start up works that do NOT require md_thread. tasks that 628 * requires md_thread should go into start() 629 */ 630 int (*run)(struct mddev *mddev); 631 /* start up works that require md threads */ 632 int (*start)(struct mddev *mddev); 633 void (*free)(struct mddev *mddev, void *priv); 634 void (*status)(struct seq_file *seq, struct mddev *mddev); 635 /* error_handler must set ->faulty and clear ->in_sync 636 * if appropriate, and should abort recovery if needed 637 */ 638 void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); 639 int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); 640 int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); 641 int (*spare_active) (struct mddev *mddev); 642 sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped); 643 int (*resize) (struct mddev *mddev, sector_t sectors); 644 sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); 645 int (*check_reshape) (struct mddev *mddev); 646 int (*start_reshape) (struct mddev *mddev); 647 void (*finish_reshape) (struct mddev *mddev); 648 void (*update_reshape_pos) (struct mddev *mddev); 649 void (*prepare_suspend) (struct mddev *mddev); 650 /* quiesce suspends or resumes internal processing. 651 * 1 - stop new actions and wait for action io to complete 652 * 0 - return to normal behaviour 653 */ 654 void (*quiesce) (struct mddev *mddev, int quiesce); 655 /* takeover is used to transition an array from one 656 * personality to another. The new personality must be able 657 * to handle the data in the current layout. 658 * e.g. 2drive raid1 -> 2drive raid5 659 * ndrive raid5 -> degraded n+1drive raid6 with special layout 660 * If the takeover succeeds, a new 'private' structure is returned. 661 * This needs to be installed and then ->run used to activate the 662 * array. 663 */ 664 void *(*takeover) (struct mddev *mddev); 665 /* Changes the consistency policy of an active array. */ 666 int (*change_consistency_policy)(struct mddev *mddev, const char *buf); 667 }; 668 669 struct md_sysfs_entry { 670 struct attribute attr; 671 ssize_t (*show)(struct mddev *, char *); 672 ssize_t (*store)(struct mddev *, const char *, size_t); 673 }; 674 extern const struct attribute_group md_bitmap_group; 675 676 static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name) 677 { 678 if (sd) 679 return sysfs_get_dirent(sd, name); 680 return sd; 681 } 682 static inline void sysfs_notify_dirent_safe(struct kernfs_node *sd) 683 { 684 if (sd) 685 sysfs_notify_dirent(sd); 686 } 687 688 static inline char * mdname (struct mddev * mddev) 689 { 690 return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; 691 } 692 693 static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) 694 { 695 char nm[20]; 696 if (!test_bit(Replacement, &rdev->flags) && 697 !test_bit(Journal, &rdev->flags) && 698 mddev->kobj.sd) { 699 sprintf(nm, "rd%d", rdev->raid_disk); 700 return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 701 } else 702 return 0; 703 } 704 705 static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) 706 { 707 char nm[20]; 708 if (!test_bit(Replacement, &rdev->flags) && 709 !test_bit(Journal, &rdev->flags) && 710 mddev->kobj.sd) { 711 sprintf(nm, "rd%d", rdev->raid_disk); 712 sysfs_remove_link(&mddev->kobj, nm); 713 } 714 } 715 716 /* 717 * iterates through some rdev ringlist. It's safe to remove the 718 * current 'rdev'. Dont touch 'tmp' though. 719 */ 720 #define rdev_for_each_list(rdev, tmp, head) \ 721 list_for_each_entry_safe(rdev, tmp, head, same_set) 722 723 /* 724 * iterates through the 'same array disks' ringlist 725 */ 726 #define rdev_for_each(rdev, mddev) \ 727 list_for_each_entry(rdev, &((mddev)->disks), same_set) 728 729 #define rdev_for_each_safe(rdev, tmp, mddev) \ 730 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) 731 732 #define rdev_for_each_rcu(rdev, mddev) \ 733 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) 734 735 struct md_thread { 736 void (*run) (struct md_thread *thread); 737 struct mddev *mddev; 738 wait_queue_head_t wqueue; 739 unsigned long flags; 740 struct task_struct *tsk; 741 unsigned long timeout; 742 void *private; 743 }; 744 745 struct md_io_clone { 746 struct mddev *mddev; 747 struct bio *orig_bio; 748 unsigned long start_time; 749 struct bio bio_clone; 750 }; 751 752 #define THREAD_WAKEUP 0 753 754 static inline void safe_put_page(struct page *p) 755 { 756 if (p) put_page(p); 757 } 758 759 extern int register_md_personality(struct md_personality *p); 760 extern int unregister_md_personality(struct md_personality *p); 761 extern int register_md_cluster_operations(struct md_cluster_operations *ops, 762 struct module *module); 763 extern int unregister_md_cluster_operations(void); 764 extern int md_setup_cluster(struct mddev *mddev, int nodes); 765 extern void md_cluster_stop(struct mddev *mddev); 766 extern struct md_thread *md_register_thread( 767 void (*run)(struct md_thread *thread), 768 struct mddev *mddev, 769 const char *name); 770 extern void md_unregister_thread(struct mddev *mddev, struct md_thread __rcu **threadp); 771 extern void md_wakeup_thread(struct md_thread __rcu *thread); 772 extern void md_check_recovery(struct mddev *mddev); 773 extern void md_reap_sync_thread(struct mddev *mddev); 774 extern bool md_write_start(struct mddev *mddev, struct bio *bi); 775 extern void md_write_inc(struct mddev *mddev, struct bio *bi); 776 extern void md_write_end(struct mddev *mddev); 777 extern void md_done_sync(struct mddev *mddev, int blocks, int ok); 778 extern void md_error(struct mddev *mddev, struct md_rdev *rdev); 779 extern void md_finish_reshape(struct mddev *mddev); 780 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev, 781 struct bio *bio, sector_t start, sector_t size); 782 void md_account_bio(struct mddev *mddev, struct bio **bio); 783 784 extern bool __must_check md_flush_request(struct mddev *mddev, struct bio *bio); 785 extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 786 sector_t sector, int size, struct page *page); 787 extern int md_super_wait(struct mddev *mddev); 788 extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 789 struct page *page, blk_opf_t opf, bool metadata_op); 790 extern void md_do_sync(struct md_thread *thread); 791 extern void md_new_event(void); 792 extern void md_allow_write(struct mddev *mddev); 793 extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); 794 extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); 795 extern int md_check_no_bitmap(struct mddev *mddev); 796 extern int md_integrity_register(struct mddev *mddev); 797 extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); 798 extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); 799 800 extern int mddev_init(struct mddev *mddev); 801 extern void mddev_destroy(struct mddev *mddev); 802 struct mddev *md_alloc(dev_t dev, char *name); 803 void mddev_put(struct mddev *mddev); 804 extern int md_run(struct mddev *mddev); 805 extern int md_start(struct mddev *mddev); 806 extern void md_stop(struct mddev *mddev); 807 extern void md_stop_writes(struct mddev *mddev); 808 extern int md_rdev_init(struct md_rdev *rdev); 809 extern void md_rdev_clear(struct md_rdev *rdev); 810 811 extern void md_handle_request(struct mddev *mddev, struct bio *bio); 812 extern void mddev_suspend(struct mddev *mddev); 813 extern void mddev_resume(struct mddev *mddev); 814 815 extern void md_reload_sb(struct mddev *mddev, int raid_disk); 816 extern void md_update_sb(struct mddev *mddev, int force); 817 extern void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev, 818 bool is_suspend); 819 extern void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev, 820 bool is_suspend); 821 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); 822 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev); 823 824 static inline bool is_rdev_broken(struct md_rdev *rdev) 825 { 826 return !disk_live(rdev->bdev->bd_disk); 827 } 828 829 static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) 830 { 831 int faulty = test_bit(Faulty, &rdev->flags); 832 if (atomic_dec_and_test(&rdev->nr_pending) && faulty) { 833 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 834 md_wakeup_thread(mddev->thread); 835 } 836 } 837 838 extern struct md_cluster_operations *md_cluster_ops; 839 static inline int mddev_is_clustered(struct mddev *mddev) 840 { 841 return mddev->cluster_info && mddev->bitmap_info.nodes > 1; 842 } 843 844 /* clear unsupported mddev_flags */ 845 static inline void mddev_clear_unsupported_flags(struct mddev *mddev, 846 unsigned long unsupported_flags) 847 { 848 mddev->flags &= ~unsupported_flags; 849 } 850 851 static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio) 852 { 853 if (bio_op(bio) == REQ_OP_WRITE_ZEROES && 854 !bio->bi_bdev->bd_disk->queue->limits.max_write_zeroes_sectors) 855 mddev->queue->limits.max_write_zeroes_sectors = 0; 856 } 857 858 struct mdu_array_info_s; 859 struct mdu_disk_info_s; 860 861 extern int mdp_major; 862 extern struct workqueue_struct *md_bitmap_wq; 863 void md_autostart_arrays(int part); 864 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info); 865 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info); 866 int do_md_run(struct mddev *mddev); 867 868 extern const struct block_device_operations md_fops; 869 870 #endif /* _MD_MD_H */ 871