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