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