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 work_struct del_work; /* used for delayed sysfs removal */ 126 127 struct kernfs_node *sysfs_state; /* handle for 'state' 128 * sysfs entry */ 129 /* handle for 'unacknowledged_bad_blocks' sysfs dentry */ 130 struct kernfs_node *sysfs_unack_badblocks; 131 /* handle for 'bad_blocks' sysfs dentry */ 132 struct kernfs_node *sysfs_badblocks; 133 struct badblocks badblocks; 134 135 struct { 136 short offset; /* Offset from superblock to start of PPL. 137 * Not used by external metadata. */ 138 unsigned int size; /* Size in sectors of the PPL space */ 139 sector_t sector; /* First sector of the PPL space */ 140 } ppl; 141 }; 142 enum flag_bits { 143 Faulty, /* device is known to have a fault */ 144 In_sync, /* device is in_sync with rest of array */ 145 Bitmap_sync, /* ..actually, not quite In_sync. Need a 146 * bitmap-based recovery to get fully in sync. 147 * The bit is only meaningful before device 148 * has been passed to pers->hot_add_disk. 149 */ 150 WriteMostly, /* Avoid reading if at all possible */ 151 AutoDetected, /* added by auto-detect */ 152 Blocked, /* An error occurred but has not yet 153 * been acknowledged by the metadata 154 * handler, so don't allow writes 155 * until it is cleared */ 156 WriteErrorSeen, /* A write error has been seen on this 157 * device 158 */ 159 FaultRecorded, /* Intermediate state for clearing 160 * Blocked. The Fault is/will-be 161 * recorded in the metadata, but that 162 * metadata hasn't been stored safely 163 * on disk yet. 164 */ 165 BlockedBadBlocks, /* A writer is blocked because they 166 * found an unacknowledged bad-block. 167 * This can safely be cleared at any 168 * time, and the writer will re-check. 169 * It may be set at any time, and at 170 * worst the writer will timeout and 171 * re-check. So setting it as 172 * accurately as possible is good, but 173 * not absolutely critical. 174 */ 175 WantReplacement, /* This device is a candidate to be 176 * hot-replaced, either because it has 177 * reported some faults, or because 178 * of explicit request. 179 */ 180 Replacement, /* This device is a replacement for 181 * a want_replacement device with same 182 * raid_disk number. 183 */ 184 Candidate, /* For clustered environments only: 185 * This device is seen locally but not 186 * by the whole cluster 187 */ 188 Journal, /* This device is used as journal for 189 * raid-5/6. 190 * Usually, this device should be faster 191 * than other devices in the array 192 */ 193 ClusterRemove, 194 RemoveSynchronized, /* synchronize_rcu() was called after 195 * this device was known to be faulty, 196 * so it is safe to remove without 197 * another synchronize_rcu() call. 198 */ 199 ExternalBbl, /* External metadata provides bad 200 * block management for a disk 201 */ 202 FailFast, /* Minimal retries should be attempted on 203 * this device, so use REQ_FAILFAST_DEV. 204 * Also don't try to repair failed reads. 205 * It is expects that no bad block log 206 * is present. 207 */ 208 LastDev, /* Seems to be the last working dev as 209 * it didn't fail, so don't use FailFast 210 * any more for metadata 211 */ 212 CollisionCheck, /* 213 * check if there is collision between raid1 214 * serial bios. 215 */ 216 }; 217 218 static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, 219 sector_t *first_bad, int *bad_sectors) 220 { 221 if (unlikely(rdev->badblocks.count)) { 222 int rv = badblocks_check(&rdev->badblocks, rdev->data_offset + s, 223 sectors, 224 first_bad, bad_sectors); 225 if (rv) 226 *first_bad -= rdev->data_offset; 227 return rv; 228 } 229 return 0; 230 } 231 extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 232 int is_new); 233 extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 234 int is_new); 235 struct md_cluster_info; 236 237 /** 238 * enum mddev_flags - md device flags. 239 * @MD_ARRAY_FIRST_USE: First use of array, needs initialization. 240 * @MD_CLOSING: If set, we are closing the array, do not open it then. 241 * @MD_JOURNAL_CLEAN: A raid with journal is already clean. 242 * @MD_HAS_JOURNAL: The raid array has journal feature set. 243 * @MD_CLUSTER_RESYNC_LOCKED: cluster raid only, which means node, already took 244 * resync lock, need to release the lock. 245 * @MD_FAILFAST_SUPPORTED: Using MD_FAILFAST on metadata writes is supported as 246 * calls to md_error() will never cause the array to 247 * become failed. 248 * @MD_HAS_PPL: The raid array has PPL feature set. 249 * @MD_HAS_MULTIPLE_PPLS: The raid array has multiple PPLs feature set. 250 * @MD_ALLOW_SB_UPDATE: md_check_recovery is allowed to update the metadata 251 * without taking reconfig_mutex. 252 * @MD_UPDATING_SB: md_check_recovery is updating the metadata without 253 * explicitly holding reconfig_mutex. 254 * @MD_NOT_READY: do_md_run() is active, so 'array_state', ust not report that 255 * array is ready yet. 256 * @MD_BROKEN: This is used to stop writes and mark array as failed. 257 * @MD_DELETED: This device is being deleted 258 * 259 * change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added 260 */ 261 enum mddev_flags { 262 MD_ARRAY_FIRST_USE, 263 MD_CLOSING, 264 MD_JOURNAL_CLEAN, 265 MD_HAS_JOURNAL, 266 MD_CLUSTER_RESYNC_LOCKED, 267 MD_FAILFAST_SUPPORTED, 268 MD_HAS_PPL, 269 MD_HAS_MULTIPLE_PPLS, 270 MD_ALLOW_SB_UPDATE, 271 MD_UPDATING_SB, 272 MD_NOT_READY, 273 MD_BROKEN, 274 MD_DELETED, 275 }; 276 277 enum mddev_sb_flags { 278 MD_SB_CHANGE_DEVS, /* Some device status has changed */ 279 MD_SB_CHANGE_CLEAN, /* transition to or from 'clean' */ 280 MD_SB_CHANGE_PENDING, /* switch from 'clean' to 'active' in progress */ 281 MD_SB_NEED_REWRITE, /* metadata write needs to be repeated */ 282 }; 283 284 #define NR_SERIAL_INFOS 8 285 /* record current range of serialize IOs */ 286 struct serial_info { 287 struct rb_node node; 288 sector_t start; /* start sector of rb node */ 289 sector_t last; /* end sector of rb node */ 290 sector_t _subtree_last; /* highest sector in subtree of rb node */ 291 }; 292 293 /* 294 * mddev->curr_resync stores the current sector of the resync but 295 * also has some overloaded values. 296 */ 297 enum { 298 /* No resync in progress */ 299 MD_RESYNC_NONE = 0, 300 /* Yielded to allow another conflicting resync to commence */ 301 MD_RESYNC_YIELDED = 1, 302 /* Delayed to check that there is no conflict with another sync */ 303 MD_RESYNC_DELAYED = 2, 304 /* Any value greater than or equal to this is in an active resync */ 305 MD_RESYNC_ACTIVE = 3, 306 }; 307 308 struct mddev { 309 void *private; 310 struct md_personality *pers; 311 dev_t unit; 312 int md_minor; 313 struct list_head disks; 314 unsigned long flags; 315 unsigned long sb_flags; 316 317 int suspended; 318 struct percpu_ref active_io; 319 int ro; 320 int sysfs_active; /* set when sysfs deletes 321 * are happening, so run/ 322 * takeover/stop are not safe 323 */ 324 struct gendisk *gendisk; 325 326 struct kobject kobj; 327 int hold_active; 328 #define UNTIL_IOCTL 1 329 #define UNTIL_STOP 2 330 331 /* Superblock information */ 332 int major_version, 333 minor_version, 334 patch_version; 335 int persistent; 336 int external; /* metadata is 337 * managed externally */ 338 char metadata_type[17]; /* externally set*/ 339 int chunk_sectors; 340 time64_t ctime, utime; 341 int level, layout; 342 char clevel[16]; 343 int raid_disks; 344 int max_disks; 345 sector_t dev_sectors; /* used size of 346 * component devices */ 347 sector_t array_sectors; /* exported array size */ 348 int external_size; /* size managed 349 * externally */ 350 __u64 events; 351 /* If the last 'event' was simply a clean->dirty transition, and 352 * we didn't write it to the spares, then it is safe and simple 353 * to just decrement the event count on a dirty->clean transition. 354 * So we record that possibility here. 355 */ 356 int can_decrease_events; 357 358 char uuid[16]; 359 360 /* If the array is being reshaped, we need to record the 361 * new shape and an indication of where we are up to. 362 * This is written to the superblock. 363 * If reshape_position is MaxSector, then no reshape is happening (yet). 364 */ 365 sector_t reshape_position; 366 int delta_disks, new_level, new_layout; 367 int new_chunk_sectors; 368 int reshape_backwards; 369 370 struct md_thread *thread; /* management thread */ 371 struct md_thread *sync_thread; /* doing resync or reconstruct */ 372 373 /* 'last_sync_action' is initialized to "none". It is set when a 374 * sync operation (i.e "data-check", "requested-resync", "resync", 375 * "recovery", or "reshape") is started. It holds this value even 376 * when the sync thread is "frozen" (interrupted) or "idle" (stopped 377 * or finished). It is overwritten when a new sync operation is begun. 378 */ 379 char *last_sync_action; 380 sector_t curr_resync; /* last block scheduled */ 381 /* As resync requests can complete out of order, we cannot easily track 382 * how much resync has been completed. So we occasionally pause until 383 * everything completes, then set curr_resync_completed to curr_resync. 384 * As such it may be well behind the real resync mark, but it is a value 385 * we are certain of. 386 */ 387 sector_t curr_resync_completed; 388 unsigned long resync_mark; /* a recent timestamp */ 389 sector_t resync_mark_cnt;/* blocks written at resync_mark */ 390 sector_t curr_mark_cnt; /* blocks scheduled now */ 391 392 sector_t resync_max_sectors; /* may be set by personality */ 393 394 atomic64_t resync_mismatches; /* count of sectors where 395 * parity/replica mismatch found 396 */ 397 398 /* allow user-space to request suspension of IO to regions of the array */ 399 sector_t suspend_lo; 400 sector_t suspend_hi; 401 /* if zero, use the system-wide default */ 402 int sync_speed_min; 403 int sync_speed_max; 404 405 /* resync even though the same disks are shared among md-devices */ 406 int parallel_resync; 407 408 int ok_start_degraded; 409 410 unsigned long recovery; 411 /* If a RAID personality determines that recovery (of a particular 412 * device) will fail due to a read error on the source device, it 413 * takes a copy of this number and does not attempt recovery again 414 * until this number changes. 415 */ 416 int recovery_disabled; 417 418 int in_sync; /* know to not need resync */ 419 /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so 420 * that we are never stopping an array while it is open. 421 * 'reconfig_mutex' protects all other reconfiguration. 422 * These locks are separate due to conflicting interactions 423 * with disk->open_mutex. 424 * Lock ordering is: 425 * reconfig_mutex -> disk->open_mutex 426 * disk->open_mutex -> open_mutex: e.g. __blkdev_get -> md_open 427 */ 428 struct mutex open_mutex; 429 struct mutex reconfig_mutex; 430 atomic_t active; /* general refcount */ 431 atomic_t openers; /* number of active opens */ 432 433 int changed; /* True if we might need to 434 * reread partition info */ 435 int degraded; /* whether md should consider 436 * adding a spare 437 */ 438 439 atomic_t recovery_active; /* blocks scheduled, but not written */ 440 wait_queue_head_t recovery_wait; 441 sector_t recovery_cp; 442 sector_t resync_min; /* user requested sync 443 * starts here */ 444 sector_t resync_max; /* resync should pause 445 * when it gets here */ 446 447 struct kernfs_node *sysfs_state; /* handle for 'array_state' 448 * file in sysfs. 449 */ 450 struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ 451 struct kernfs_node *sysfs_completed; /*handle for 'sync_completed' */ 452 struct kernfs_node *sysfs_degraded; /*handle for 'degraded' */ 453 struct kernfs_node *sysfs_level; /*handle for 'level' */ 454 455 struct work_struct del_work; /* used for delayed sysfs removal */ 456 457 /* "lock" protects: 458 * flush_bio transition from NULL to !NULL 459 * rdev superblocks, events 460 * clearing MD_CHANGE_* 461 * in_sync - and related safemode and MD_CHANGE changes 462 * pers (also protected by reconfig_mutex and pending IO). 463 * clearing ->bitmap 464 * clearing ->bitmap_info.file 465 * changing ->resync_{min,max} 466 * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max}) 467 */ 468 spinlock_t lock; 469 wait_queue_head_t sb_wait; /* for waiting on superblock updates */ 470 atomic_t pending_writes; /* number of active superblock writes */ 471 472 unsigned int safemode; /* if set, update "clean" superblock 473 * when no writes pending. 474 */ 475 unsigned int safemode_delay; 476 struct timer_list safemode_timer; 477 struct percpu_ref writes_pending; 478 int sync_checkers; /* # of threads checking writes_pending */ 479 struct request_queue *queue; /* for plugging ... */ 480 481 struct bitmap *bitmap; /* the bitmap for the device */ 482 struct { 483 struct file *file; /* the bitmap file */ 484 loff_t offset; /* offset from superblock of 485 * start of bitmap. May be 486 * negative, but not '0' 487 * For external metadata, offset 488 * from start of device. 489 */ 490 unsigned long space; /* space available at this offset */ 491 loff_t default_offset; /* this is the offset to use when 492 * hot-adding a bitmap. It should 493 * eventually be settable by sysfs. 494 */ 495 unsigned long default_space; /* space available at 496 * default offset */ 497 struct mutex mutex; 498 unsigned long chunksize; 499 unsigned long daemon_sleep; /* how many jiffies between updates? */ 500 unsigned long max_write_behind; /* write-behind mode */ 501 int external; 502 int nodes; /* Maximum number of nodes in the cluster */ 503 char cluster_name[64]; /* Name of the cluster */ 504 } bitmap_info; 505 506 atomic_t max_corr_read_errors; /* max read retries */ 507 struct list_head all_mddevs; 508 509 const struct attribute_group *to_remove; 510 511 struct bio_set bio_set; 512 struct bio_set sync_set; /* for sync operations like 513 * metadata and bitmap writes 514 */ 515 struct bio_set io_acct_set; /* for raid0 and raid5 io accounting */ 516 517 /* Generic flush handling. 518 * The last to finish preflush schedules a worker to submit 519 * the rest of the request (without the REQ_PREFLUSH flag). 520 */ 521 struct bio *flush_bio; 522 atomic_t flush_pending; 523 ktime_t start_flush, prev_flush_start; /* prev_flush_start is when the previous completed 524 * flush was started. 525 */ 526 struct work_struct flush_work; 527 struct work_struct event_work; /* used by dm to report failure event */ 528 mempool_t *serial_info_pool; 529 void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); 530 struct md_cluster_info *cluster_info; 531 unsigned int good_device_nr; /* good device num within cluster raid */ 532 unsigned int noio_flag; /* for memalloc scope API */ 533 534 bool has_superblocks:1; 535 bool fail_last_dev:1; 536 bool serialize_policy:1; 537 }; 538 539 enum recovery_flags { 540 /* 541 * If neither SYNC or RESHAPE are set, then it is a recovery. 542 */ 543 MD_RECOVERY_RUNNING, /* a thread is running, or about to be started */ 544 MD_RECOVERY_SYNC, /* actually doing a resync, not a recovery */ 545 MD_RECOVERY_RECOVER, /* doing recovery, or need to try it. */ 546 MD_RECOVERY_INTR, /* resync needs to be aborted for some reason */ 547 MD_RECOVERY_DONE, /* thread is done and is waiting to be reaped */ 548 MD_RECOVERY_NEEDED, /* we might need to start a resync/recover */ 549 MD_RECOVERY_REQUESTED, /* user-space has requested a sync (used with SYNC) */ 550 MD_RECOVERY_CHECK, /* user-space request for check-only, no repair */ 551 MD_RECOVERY_RESHAPE, /* A reshape is happening */ 552 MD_RECOVERY_FROZEN, /* User request to abort, and not restart, any action */ 553 MD_RECOVERY_ERROR, /* sync-action interrupted because io-error */ 554 MD_RECOVERY_WAIT, /* waiting for pers->start() to finish */ 555 MD_RESYNCING_REMOTE, /* remote node is running resync thread */ 556 }; 557 558 static inline int __must_check mddev_lock(struct mddev *mddev) 559 { 560 return mutex_lock_interruptible(&mddev->reconfig_mutex); 561 } 562 563 /* Sometimes we need to take the lock in a situation where 564 * failure due to interrupts is not acceptable. 565 */ 566 static inline void mddev_lock_nointr(struct mddev *mddev) 567 { 568 mutex_lock(&mddev->reconfig_mutex); 569 } 570 571 static inline int mddev_trylock(struct mddev *mddev) 572 { 573 return mutex_trylock(&mddev->reconfig_mutex); 574 } 575 extern void mddev_unlock(struct mddev *mddev); 576 577 static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) 578 { 579 atomic_add(nr_sectors, &bdev->bd_disk->sync_io); 580 } 581 582 static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) 583 { 584 md_sync_acct(bio->bi_bdev, nr_sectors); 585 } 586 587 struct md_personality 588 { 589 char *name; 590 int level; 591 struct list_head list; 592 struct module *owner; 593 bool __must_check (*make_request)(struct mddev *mddev, struct bio *bio); 594 /* 595 * start up works that do NOT require md_thread. tasks that 596 * requires md_thread should go into start() 597 */ 598 int (*run)(struct mddev *mddev); 599 /* start up works that require md threads */ 600 int (*start)(struct mddev *mddev); 601 void (*free)(struct mddev *mddev, void *priv); 602 void (*status)(struct seq_file *seq, struct mddev *mddev); 603 /* error_handler must set ->faulty and clear ->in_sync 604 * if appropriate, and should abort recovery if needed 605 */ 606 void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); 607 int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); 608 int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); 609 int (*spare_active) (struct mddev *mddev); 610 sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped); 611 int (*resize) (struct mddev *mddev, sector_t sectors); 612 sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); 613 int (*check_reshape) (struct mddev *mddev); 614 int (*start_reshape) (struct mddev *mddev); 615 void (*finish_reshape) (struct mddev *mddev); 616 void (*update_reshape_pos) (struct mddev *mddev); 617 /* quiesce suspends or resumes internal processing. 618 * 1 - stop new actions and wait for action io to complete 619 * 0 - return to normal behaviour 620 */ 621 void (*quiesce) (struct mddev *mddev, int quiesce); 622 /* takeover is used to transition an array from one 623 * personality to another. The new personality must be able 624 * to handle the data in the current layout. 625 * e.g. 2drive raid1 -> 2drive raid5 626 * ndrive raid5 -> degraded n+1drive raid6 with special layout 627 * If the takeover succeeds, a new 'private' structure is returned. 628 * This needs to be installed and then ->run used to activate the 629 * array. 630 */ 631 void *(*takeover) (struct mddev *mddev); 632 /* Changes the consistency policy of an active array. */ 633 int (*change_consistency_policy)(struct mddev *mddev, const char *buf); 634 }; 635 636 struct md_sysfs_entry { 637 struct attribute attr; 638 ssize_t (*show)(struct mddev *, char *); 639 ssize_t (*store)(struct mddev *, const char *, size_t); 640 }; 641 extern const struct attribute_group md_bitmap_group; 642 643 static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name) 644 { 645 if (sd) 646 return sysfs_get_dirent(sd, name); 647 return sd; 648 } 649 static inline void sysfs_notify_dirent_safe(struct kernfs_node *sd) 650 { 651 if (sd) 652 sysfs_notify_dirent(sd); 653 } 654 655 static inline char * mdname (struct mddev * mddev) 656 { 657 return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; 658 } 659 660 static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) 661 { 662 char nm[20]; 663 if (!test_bit(Replacement, &rdev->flags) && 664 !test_bit(Journal, &rdev->flags) && 665 mddev->kobj.sd) { 666 sprintf(nm, "rd%d", rdev->raid_disk); 667 return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 668 } else 669 return 0; 670 } 671 672 static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) 673 { 674 char nm[20]; 675 if (!test_bit(Replacement, &rdev->flags) && 676 !test_bit(Journal, &rdev->flags) && 677 mddev->kobj.sd) { 678 sprintf(nm, "rd%d", rdev->raid_disk); 679 sysfs_remove_link(&mddev->kobj, nm); 680 } 681 } 682 683 /* 684 * iterates through some rdev ringlist. It's safe to remove the 685 * current 'rdev'. Dont touch 'tmp' though. 686 */ 687 #define rdev_for_each_list(rdev, tmp, head) \ 688 list_for_each_entry_safe(rdev, tmp, head, same_set) 689 690 /* 691 * iterates through the 'same array disks' ringlist 692 */ 693 #define rdev_for_each(rdev, mddev) \ 694 list_for_each_entry(rdev, &((mddev)->disks), same_set) 695 696 #define rdev_for_each_safe(rdev, tmp, mddev) \ 697 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) 698 699 #define rdev_for_each_rcu(rdev, mddev) \ 700 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) 701 702 struct md_thread { 703 void (*run) (struct md_thread *thread); 704 struct mddev *mddev; 705 wait_queue_head_t wqueue; 706 unsigned long flags; 707 struct task_struct *tsk; 708 unsigned long timeout; 709 void *private; 710 }; 711 712 struct md_io_acct { 713 struct mddev *mddev; 714 struct bio *orig_bio; 715 unsigned long start_time; 716 struct bio bio_clone; 717 }; 718 719 #define THREAD_WAKEUP 0 720 721 static inline void safe_put_page(struct page *p) 722 { 723 if (p) put_page(p); 724 } 725 726 extern int register_md_personality(struct md_personality *p); 727 extern int unregister_md_personality(struct md_personality *p); 728 extern int register_md_cluster_operations(struct md_cluster_operations *ops, 729 struct module *module); 730 extern int unregister_md_cluster_operations(void); 731 extern int md_setup_cluster(struct mddev *mddev, int nodes); 732 extern void md_cluster_stop(struct mddev *mddev); 733 extern struct md_thread *md_register_thread( 734 void (*run)(struct md_thread *thread), 735 struct mddev *mddev, 736 const char *name); 737 extern void md_unregister_thread(struct md_thread **threadp); 738 extern void md_wakeup_thread(struct md_thread *thread); 739 extern void md_check_recovery(struct mddev *mddev); 740 extern void md_reap_sync_thread(struct mddev *mddev); 741 extern int mddev_init_writes_pending(struct mddev *mddev); 742 extern bool md_write_start(struct mddev *mddev, struct bio *bi); 743 extern void md_write_inc(struct mddev *mddev, struct bio *bi); 744 extern void md_write_end(struct mddev *mddev); 745 extern void md_done_sync(struct mddev *mddev, int blocks, int ok); 746 extern void md_error(struct mddev *mddev, struct md_rdev *rdev); 747 extern void md_finish_reshape(struct mddev *mddev); 748 void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev, 749 struct bio *bio, sector_t start, sector_t size); 750 int acct_bioset_init(struct mddev *mddev); 751 void acct_bioset_exit(struct mddev *mddev); 752 void md_account_bio(struct mddev *mddev, struct bio **bio); 753 754 extern bool __must_check md_flush_request(struct mddev *mddev, struct bio *bio); 755 extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 756 sector_t sector, int size, struct page *page); 757 extern int md_super_wait(struct mddev *mddev); 758 extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 759 struct page *page, blk_opf_t opf, bool metadata_op); 760 extern void md_do_sync(struct md_thread *thread); 761 extern void md_new_event(void); 762 extern void md_allow_write(struct mddev *mddev); 763 extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); 764 extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); 765 extern int md_check_no_bitmap(struct mddev *mddev); 766 extern int md_integrity_register(struct mddev *mddev); 767 extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); 768 extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); 769 770 extern void mddev_init(struct mddev *mddev); 771 struct mddev *md_alloc(dev_t dev, char *name); 772 void mddev_put(struct mddev *mddev); 773 extern int md_run(struct mddev *mddev); 774 extern int md_start(struct mddev *mddev); 775 extern void md_stop(struct mddev *mddev); 776 extern void md_stop_writes(struct mddev *mddev); 777 extern int md_rdev_init(struct md_rdev *rdev); 778 extern void md_rdev_clear(struct md_rdev *rdev); 779 780 extern void md_handle_request(struct mddev *mddev, struct bio *bio); 781 extern void mddev_suspend(struct mddev *mddev); 782 extern void mddev_resume(struct mddev *mddev); 783 784 extern void md_reload_sb(struct mddev *mddev, int raid_disk); 785 extern void md_update_sb(struct mddev *mddev, int force); 786 extern void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev, 787 bool is_suspend); 788 extern void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev, 789 bool is_suspend); 790 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); 791 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev); 792 793 static inline bool is_mddev_broken(struct md_rdev *rdev, const char *md_type) 794 { 795 if (!disk_live(rdev->bdev->bd_disk)) { 796 if (!test_and_set_bit(MD_BROKEN, &rdev->mddev->flags)) 797 pr_warn("md: %s: %s array has a missing/failed member\n", 798 mdname(rdev->mddev), md_type); 799 return true; 800 } 801 return false; 802 } 803 804 static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) 805 { 806 int faulty = test_bit(Faulty, &rdev->flags); 807 if (atomic_dec_and_test(&rdev->nr_pending) && faulty) { 808 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 809 md_wakeup_thread(mddev->thread); 810 } 811 } 812 813 extern struct md_cluster_operations *md_cluster_ops; 814 static inline int mddev_is_clustered(struct mddev *mddev) 815 { 816 return mddev->cluster_info && mddev->bitmap_info.nodes > 1; 817 } 818 819 /* clear unsupported mddev_flags */ 820 static inline void mddev_clear_unsupported_flags(struct mddev *mddev, 821 unsigned long unsupported_flags) 822 { 823 mddev->flags &= ~unsupported_flags; 824 } 825 826 static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio) 827 { 828 if (bio_op(bio) == REQ_OP_WRITE_ZEROES && 829 !bio->bi_bdev->bd_disk->queue->limits.max_write_zeroes_sectors) 830 mddev->queue->limits.max_write_zeroes_sectors = 0; 831 } 832 833 struct mdu_array_info_s; 834 struct mdu_disk_info_s; 835 836 extern int mdp_major; 837 void md_autostart_arrays(int part); 838 int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info); 839 int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info); 840 int do_md_run(struct mddev *mddev); 841 842 extern const struct block_device_operations md_fops; 843 844 #endif /* _MD_MD_H */ 845