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 */ 112 113 /* 114 * The members for check collision of write behind IOs. 115 */ 116 struct list_head wb_list; 117 spinlock_t wb_list_lock; 118 wait_queue_head_t wb_io_wait; 119 120 struct work_struct del_work; /* used for delayed sysfs removal */ 121 122 struct kernfs_node *sysfs_state; /* handle for 'state' 123 * sysfs entry */ 124 125 struct badblocks badblocks; 126 127 struct { 128 short offset; /* Offset from superblock to start of PPL. 129 * Not used by external metadata. */ 130 unsigned int size; /* Size in sectors of the PPL space */ 131 sector_t sector; /* First sector of the PPL space */ 132 } ppl; 133 }; 134 enum flag_bits { 135 Faulty, /* device is known to have a fault */ 136 In_sync, /* device is in_sync with rest of array */ 137 Bitmap_sync, /* ..actually, not quite In_sync. Need a 138 * bitmap-based recovery to get fully in sync. 139 * The bit is only meaningful before device 140 * has been passed to pers->hot_add_disk. 141 */ 142 WriteMostly, /* Avoid reading if at all possible */ 143 AutoDetected, /* added by auto-detect */ 144 Blocked, /* An error occurred but has not yet 145 * been acknowledged by the metadata 146 * handler, so don't allow writes 147 * until it is cleared */ 148 WriteErrorSeen, /* A write error has been seen on this 149 * device 150 */ 151 FaultRecorded, /* Intermediate state for clearing 152 * Blocked. The Fault is/will-be 153 * recorded in the metadata, but that 154 * metadata hasn't been stored safely 155 * on disk yet. 156 */ 157 BlockedBadBlocks, /* A writer is blocked because they 158 * found an unacknowledged bad-block. 159 * This can safely be cleared at any 160 * time, and the writer will re-check. 161 * It may be set at any time, and at 162 * worst the writer will timeout and 163 * re-check. So setting it as 164 * accurately as possible is good, but 165 * not absolutely critical. 166 */ 167 WantReplacement, /* This device is a candidate to be 168 * hot-replaced, either because it has 169 * reported some faults, or because 170 * of explicit request. 171 */ 172 Replacement, /* This device is a replacement for 173 * a want_replacement device with same 174 * raid_disk number. 175 */ 176 Candidate, /* For clustered environments only: 177 * This device is seen locally but not 178 * by the whole cluster 179 */ 180 Journal, /* This device is used as journal for 181 * raid-5/6. 182 * Usually, this device should be faster 183 * than other devices in the array 184 */ 185 ClusterRemove, 186 RemoveSynchronized, /* synchronize_rcu() was called after 187 * this device was known to be faulty, 188 * so it is safe to remove without 189 * another synchronize_rcu() call. 190 */ 191 ExternalBbl, /* External metadata provides bad 192 * block management for a disk 193 */ 194 FailFast, /* Minimal retries should be attempted on 195 * this device, so use REQ_FAILFAST_DEV. 196 * Also don't try to repair failed reads. 197 * It is expects that no bad block log 198 * is present. 199 */ 200 LastDev, /* Seems to be the last working dev as 201 * it didn't fail, so don't use FailFast 202 * any more for metadata 203 */ 204 WBCollisionCheck, /* 205 * multiqueue device should check if there 206 * is collision between write behind bios. 207 */ 208 }; 209 210 static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, 211 sector_t *first_bad, int *bad_sectors) 212 { 213 if (unlikely(rdev->badblocks.count)) { 214 int rv = badblocks_check(&rdev->badblocks, rdev->data_offset + s, 215 sectors, 216 first_bad, bad_sectors); 217 if (rv) 218 *first_bad -= rdev->data_offset; 219 return rv; 220 } 221 return 0; 222 } 223 extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 224 int is_new); 225 extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 226 int is_new); 227 struct md_cluster_info; 228 229 /* change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added */ 230 enum mddev_flags { 231 MD_ARRAY_FIRST_USE, /* First use of array, needs initialization */ 232 MD_CLOSING, /* If set, we are closing the array, do not open 233 * it then */ 234 MD_JOURNAL_CLEAN, /* A raid with journal is already clean */ 235 MD_HAS_JOURNAL, /* The raid array has journal feature set */ 236 MD_CLUSTER_RESYNC_LOCKED, /* cluster raid only, which means node 237 * already took resync lock, need to 238 * release the lock */ 239 MD_FAILFAST_SUPPORTED, /* Using MD_FAILFAST on metadata writes is 240 * supported as calls to md_error() will 241 * never cause the array to become failed. 242 */ 243 MD_HAS_PPL, /* The raid array has PPL feature set */ 244 MD_HAS_MULTIPLE_PPLS, /* The raid array has multiple PPLs feature set */ 245 MD_ALLOW_SB_UPDATE, /* md_check_recovery is allowed to update 246 * the metadata without taking reconfig_mutex. 247 */ 248 MD_UPDATING_SB, /* md_check_recovery is updating the metadata 249 * without explicitly holding reconfig_mutex. 250 */ 251 MD_NOT_READY, /* do_md_run() is active, so 'array_state' 252 * must not report that array is ready yet 253 */ 254 MD_BROKEN, /* This is used in RAID-0/LINEAR only, to stop 255 * I/O in case an array member is gone/failed. 256 */ 257 }; 258 259 enum mddev_sb_flags { 260 MD_SB_CHANGE_DEVS, /* Some device status has changed */ 261 MD_SB_CHANGE_CLEAN, /* transition to or from 'clean' */ 262 MD_SB_CHANGE_PENDING, /* switch from 'clean' to 'active' in progress */ 263 MD_SB_NEED_REWRITE, /* metadata write needs to be repeated */ 264 }; 265 266 #define NR_WB_INFOS 8 267 /* record current range of write behind IOs */ 268 struct wb_info { 269 sector_t lo; 270 sector_t hi; 271 struct list_head list; 272 }; 273 274 struct mddev { 275 void *private; 276 struct md_personality *pers; 277 dev_t unit; 278 int md_minor; 279 struct list_head disks; 280 unsigned long flags; 281 unsigned long sb_flags; 282 283 int suspended; 284 atomic_t active_io; 285 int ro; 286 int sysfs_active; /* set when sysfs deletes 287 * are happening, so run/ 288 * takeover/stop are not safe 289 */ 290 struct gendisk *gendisk; 291 292 struct kobject kobj; 293 int hold_active; 294 #define UNTIL_IOCTL 1 295 #define UNTIL_STOP 2 296 297 /* Superblock information */ 298 int major_version, 299 minor_version, 300 patch_version; 301 int persistent; 302 int external; /* metadata is 303 * managed externally */ 304 char metadata_type[17]; /* externally set*/ 305 int chunk_sectors; 306 time64_t ctime, utime; 307 int level, layout; 308 char clevel[16]; 309 int raid_disks; 310 int max_disks; 311 sector_t dev_sectors; /* used size of 312 * component devices */ 313 sector_t array_sectors; /* exported array size */ 314 int external_size; /* size managed 315 * externally */ 316 __u64 events; 317 /* If the last 'event' was simply a clean->dirty transition, and 318 * we didn't write it to the spares, then it is safe and simple 319 * to just decrement the event count on a dirty->clean transition. 320 * So we record that possibility here. 321 */ 322 int can_decrease_events; 323 324 char uuid[16]; 325 326 /* If the array is being reshaped, we need to record the 327 * new shape and an indication of where we are up to. 328 * This is written to the superblock. 329 * If reshape_position is MaxSector, then no reshape is happening (yet). 330 */ 331 sector_t reshape_position; 332 int delta_disks, new_level, new_layout; 333 int new_chunk_sectors; 334 int reshape_backwards; 335 336 struct md_thread *thread; /* management thread */ 337 struct md_thread *sync_thread; /* doing resync or reconstruct */ 338 339 /* 'last_sync_action' is initialized to "none". It is set when a 340 * sync operation (i.e "data-check", "requested-resync", "resync", 341 * "recovery", or "reshape") is started. It holds this value even 342 * when the sync thread is "frozen" (interrupted) or "idle" (stopped 343 * or finished). It is overwritten when a new sync operation is begun. 344 */ 345 char *last_sync_action; 346 sector_t curr_resync; /* last block scheduled */ 347 /* As resync requests can complete out of order, we cannot easily track 348 * how much resync has been completed. So we occasionally pause until 349 * everything completes, then set curr_resync_completed to curr_resync. 350 * As such it may be well behind the real resync mark, but it is a value 351 * we are certain of. 352 */ 353 sector_t curr_resync_completed; 354 unsigned long resync_mark; /* a recent timestamp */ 355 sector_t resync_mark_cnt;/* blocks written at resync_mark */ 356 sector_t curr_mark_cnt; /* blocks scheduled now */ 357 358 sector_t resync_max_sectors; /* may be set by personality */ 359 360 atomic64_t resync_mismatches; /* count of sectors where 361 * parity/replica mismatch found 362 */ 363 364 /* allow user-space to request suspension of IO to regions of the array */ 365 sector_t suspend_lo; 366 sector_t suspend_hi; 367 /* if zero, use the system-wide default */ 368 int sync_speed_min; 369 int sync_speed_max; 370 371 /* resync even though the same disks are shared among md-devices */ 372 int parallel_resync; 373 374 int ok_start_degraded; 375 376 unsigned long recovery; 377 /* If a RAID personality determines that recovery (of a particular 378 * device) will fail due to a read error on the source device, it 379 * takes a copy of this number and does not attempt recovery again 380 * until this number changes. 381 */ 382 int recovery_disabled; 383 384 int in_sync; /* know to not need resync */ 385 /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so 386 * that we are never stopping an array while it is open. 387 * 'reconfig_mutex' protects all other reconfiguration. 388 * These locks are separate due to conflicting interactions 389 * with bdev->bd_mutex. 390 * Lock ordering is: 391 * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk 392 * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open 393 */ 394 struct mutex open_mutex; 395 struct mutex reconfig_mutex; 396 atomic_t active; /* general refcount */ 397 atomic_t openers; /* number of active opens */ 398 399 int changed; /* True if we might need to 400 * reread partition info */ 401 int degraded; /* whether md should consider 402 * adding a spare 403 */ 404 405 atomic_t recovery_active; /* blocks scheduled, but not written */ 406 wait_queue_head_t recovery_wait; 407 sector_t recovery_cp; 408 sector_t resync_min; /* user requested sync 409 * starts here */ 410 sector_t resync_max; /* resync should pause 411 * when it gets here */ 412 413 struct kernfs_node *sysfs_state; /* handle for 'array_state' 414 * file in sysfs. 415 */ 416 struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ 417 418 struct work_struct del_work; /* used for delayed sysfs removal */ 419 420 /* "lock" protects: 421 * flush_bio transition from NULL to !NULL 422 * rdev superblocks, events 423 * clearing MD_CHANGE_* 424 * in_sync - and related safemode and MD_CHANGE changes 425 * pers (also protected by reconfig_mutex and pending IO). 426 * clearing ->bitmap 427 * clearing ->bitmap_info.file 428 * changing ->resync_{min,max} 429 * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max}) 430 */ 431 spinlock_t lock; 432 wait_queue_head_t sb_wait; /* for waiting on superblock updates */ 433 atomic_t pending_writes; /* number of active superblock writes */ 434 435 unsigned int safemode; /* if set, update "clean" superblock 436 * when no writes pending. 437 */ 438 unsigned int safemode_delay; 439 struct timer_list safemode_timer; 440 struct percpu_ref writes_pending; 441 int sync_checkers; /* # of threads checking writes_pending */ 442 struct request_queue *queue; /* for plugging ... */ 443 444 struct bitmap *bitmap; /* the bitmap for the device */ 445 struct { 446 struct file *file; /* the bitmap file */ 447 loff_t offset; /* offset from superblock of 448 * start of bitmap. May be 449 * negative, but not '0' 450 * For external metadata, offset 451 * from start of device. 452 */ 453 unsigned long space; /* space available at this offset */ 454 loff_t default_offset; /* this is the offset to use when 455 * hot-adding a bitmap. It should 456 * eventually be settable by sysfs. 457 */ 458 unsigned long default_space; /* space available at 459 * default offset */ 460 struct mutex mutex; 461 unsigned long chunksize; 462 unsigned long daemon_sleep; /* how many jiffies between updates? */ 463 unsigned long max_write_behind; /* write-behind mode */ 464 int external; 465 int nodes; /* Maximum number of nodes in the cluster */ 466 char cluster_name[64]; /* Name of the cluster */ 467 } bitmap_info; 468 469 atomic_t max_corr_read_errors; /* max read retries */ 470 struct list_head all_mddevs; 471 472 struct attribute_group *to_remove; 473 474 struct bio_set bio_set; 475 struct bio_set sync_set; /* for sync operations like 476 * metadata and bitmap writes 477 */ 478 479 /* Generic flush handling. 480 * The last to finish preflush schedules a worker to submit 481 * the rest of the request (without the REQ_PREFLUSH flag). 482 */ 483 struct bio *flush_bio; 484 atomic_t flush_pending; 485 ktime_t start_flush, last_flush; /* last_flush is when the last completed 486 * flush was started. 487 */ 488 struct work_struct flush_work; 489 struct work_struct event_work; /* used by dm to report failure event */ 490 mempool_t *wb_info_pool; 491 void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); 492 struct md_cluster_info *cluster_info; 493 unsigned int good_device_nr; /* good device num within cluster raid */ 494 495 bool has_superblocks:1; 496 bool fail_last_dev:1; 497 }; 498 499 enum recovery_flags { 500 /* 501 * If neither SYNC or RESHAPE are set, then it is a recovery. 502 */ 503 MD_RECOVERY_RUNNING, /* a thread is running, or about to be started */ 504 MD_RECOVERY_SYNC, /* actually doing a resync, not a recovery */ 505 MD_RECOVERY_RECOVER, /* doing recovery, or need to try it. */ 506 MD_RECOVERY_INTR, /* resync needs to be aborted for some reason */ 507 MD_RECOVERY_DONE, /* thread is done and is waiting to be reaped */ 508 MD_RECOVERY_NEEDED, /* we might need to start a resync/recover */ 509 MD_RECOVERY_REQUESTED, /* user-space has requested a sync (used with SYNC) */ 510 MD_RECOVERY_CHECK, /* user-space request for check-only, no repair */ 511 MD_RECOVERY_RESHAPE, /* A reshape is happening */ 512 MD_RECOVERY_FROZEN, /* User request to abort, and not restart, any action */ 513 MD_RECOVERY_ERROR, /* sync-action interrupted because io-error */ 514 MD_RECOVERY_WAIT, /* waiting for pers->start() to finish */ 515 MD_RESYNCING_REMOTE, /* remote node is running resync thread */ 516 }; 517 518 static inline int __must_check mddev_lock(struct mddev *mddev) 519 { 520 return mutex_lock_interruptible(&mddev->reconfig_mutex); 521 } 522 523 /* Sometimes we need to take the lock in a situation where 524 * failure due to interrupts is not acceptable. 525 */ 526 static inline void mddev_lock_nointr(struct mddev *mddev) 527 { 528 mutex_lock(&mddev->reconfig_mutex); 529 } 530 531 static inline int mddev_trylock(struct mddev *mddev) 532 { 533 return mutex_trylock(&mddev->reconfig_mutex); 534 } 535 extern void mddev_unlock(struct mddev *mddev); 536 537 static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) 538 { 539 atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); 540 } 541 542 static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) 543 { 544 atomic_add(nr_sectors, &bio->bi_disk->sync_io); 545 } 546 547 struct md_personality 548 { 549 char *name; 550 int level; 551 struct list_head list; 552 struct module *owner; 553 bool __must_check (*make_request)(struct mddev *mddev, struct bio *bio); 554 /* 555 * start up works that do NOT require md_thread. tasks that 556 * requires md_thread should go into start() 557 */ 558 int (*run)(struct mddev *mddev); 559 /* start up works that require md threads */ 560 int (*start)(struct mddev *mddev); 561 void (*free)(struct mddev *mddev, void *priv); 562 void (*status)(struct seq_file *seq, struct mddev *mddev); 563 /* error_handler must set ->faulty and clear ->in_sync 564 * if appropriate, and should abort recovery if needed 565 */ 566 void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); 567 int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); 568 int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); 569 int (*spare_active) (struct mddev *mddev); 570 sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped); 571 int (*resize) (struct mddev *mddev, sector_t sectors); 572 sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); 573 int (*check_reshape) (struct mddev *mddev); 574 int (*start_reshape) (struct mddev *mddev); 575 void (*finish_reshape) (struct mddev *mddev); 576 void (*update_reshape_pos) (struct mddev *mddev); 577 /* quiesce suspends or resumes internal processing. 578 * 1 - stop new actions and wait for action io to complete 579 * 0 - return to normal behaviour 580 */ 581 void (*quiesce) (struct mddev *mddev, int quiesce); 582 /* takeover is used to transition an array from one 583 * personality to another. The new personality must be able 584 * to handle the data in the current layout. 585 * e.g. 2drive raid1 -> 2drive raid5 586 * ndrive raid5 -> degraded n+1drive raid6 with special layout 587 * If the takeover succeeds, a new 'private' structure is returned. 588 * This needs to be installed and then ->run used to activate the 589 * array. 590 */ 591 void *(*takeover) (struct mddev *mddev); 592 /* congested implements bdi.congested_fn(). 593 * Will not be called while array is 'suspended' */ 594 int (*congested)(struct mddev *mddev, int bits); 595 /* Changes the consistency policy of an active array. */ 596 int (*change_consistency_policy)(struct mddev *mddev, const char *buf); 597 }; 598 599 struct md_sysfs_entry { 600 struct attribute attr; 601 ssize_t (*show)(struct mddev *, char *); 602 ssize_t (*store)(struct mddev *, const char *, size_t); 603 }; 604 extern struct attribute_group md_bitmap_group; 605 606 static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name) 607 { 608 if (sd) 609 return sysfs_get_dirent(sd, name); 610 return sd; 611 } 612 static inline void sysfs_notify_dirent_safe(struct kernfs_node *sd) 613 { 614 if (sd) 615 sysfs_notify_dirent(sd); 616 } 617 618 static inline char * mdname (struct mddev * mddev) 619 { 620 return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; 621 } 622 623 static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) 624 { 625 char nm[20]; 626 if (!test_bit(Replacement, &rdev->flags) && 627 !test_bit(Journal, &rdev->flags) && 628 mddev->kobj.sd) { 629 sprintf(nm, "rd%d", rdev->raid_disk); 630 return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 631 } else 632 return 0; 633 } 634 635 static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) 636 { 637 char nm[20]; 638 if (!test_bit(Replacement, &rdev->flags) && 639 !test_bit(Journal, &rdev->flags) && 640 mddev->kobj.sd) { 641 sprintf(nm, "rd%d", rdev->raid_disk); 642 sysfs_remove_link(&mddev->kobj, nm); 643 } 644 } 645 646 /* 647 * iterates through some rdev ringlist. It's safe to remove the 648 * current 'rdev'. Dont touch 'tmp' though. 649 */ 650 #define rdev_for_each_list(rdev, tmp, head) \ 651 list_for_each_entry_safe(rdev, tmp, head, same_set) 652 653 /* 654 * iterates through the 'same array disks' ringlist 655 */ 656 #define rdev_for_each(rdev, mddev) \ 657 list_for_each_entry(rdev, &((mddev)->disks), same_set) 658 659 #define rdev_for_each_safe(rdev, tmp, mddev) \ 660 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) 661 662 #define rdev_for_each_rcu(rdev, mddev) \ 663 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) 664 665 struct md_thread { 666 void (*run) (struct md_thread *thread); 667 struct mddev *mddev; 668 wait_queue_head_t wqueue; 669 unsigned long flags; 670 struct task_struct *tsk; 671 unsigned long timeout; 672 void *private; 673 }; 674 675 #define THREAD_WAKEUP 0 676 677 static inline void safe_put_page(struct page *p) 678 { 679 if (p) put_page(p); 680 } 681 682 extern int register_md_personality(struct md_personality *p); 683 extern int unregister_md_personality(struct md_personality *p); 684 extern int register_md_cluster_operations(struct md_cluster_operations *ops, 685 struct module *module); 686 extern int unregister_md_cluster_operations(void); 687 extern int md_setup_cluster(struct mddev *mddev, int nodes); 688 extern void md_cluster_stop(struct mddev *mddev); 689 extern struct md_thread *md_register_thread( 690 void (*run)(struct md_thread *thread), 691 struct mddev *mddev, 692 const char *name); 693 extern void md_unregister_thread(struct md_thread **threadp); 694 extern void md_wakeup_thread(struct md_thread *thread); 695 extern void md_check_recovery(struct mddev *mddev); 696 extern void md_reap_sync_thread(struct mddev *mddev); 697 extern int mddev_init_writes_pending(struct mddev *mddev); 698 extern bool md_write_start(struct mddev *mddev, struct bio *bi); 699 extern void md_write_inc(struct mddev *mddev, struct bio *bi); 700 extern void md_write_end(struct mddev *mddev); 701 extern void md_done_sync(struct mddev *mddev, int blocks, int ok); 702 extern void md_error(struct mddev *mddev, struct md_rdev *rdev); 703 extern void md_finish_reshape(struct mddev *mddev); 704 705 extern int mddev_congested(struct mddev *mddev, int bits); 706 extern bool __must_check md_flush_request(struct mddev *mddev, struct bio *bio); 707 extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 708 sector_t sector, int size, struct page *page); 709 extern int md_super_wait(struct mddev *mddev); 710 extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 711 struct page *page, int op, int op_flags, 712 bool metadata_op); 713 extern void md_do_sync(struct md_thread *thread); 714 extern void md_new_event(struct mddev *mddev); 715 extern void md_allow_write(struct mddev *mddev); 716 extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); 717 extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); 718 extern int md_check_no_bitmap(struct mddev *mddev); 719 extern int md_integrity_register(struct mddev *mddev); 720 extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); 721 extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); 722 723 extern void mddev_init(struct mddev *mddev); 724 extern int md_run(struct mddev *mddev); 725 extern int md_start(struct mddev *mddev); 726 extern void md_stop(struct mddev *mddev); 727 extern void md_stop_writes(struct mddev *mddev); 728 extern int md_rdev_init(struct md_rdev *rdev); 729 extern void md_rdev_clear(struct md_rdev *rdev); 730 731 extern void md_handle_request(struct mddev *mddev, struct bio *bio); 732 extern void mddev_suspend(struct mddev *mddev); 733 extern void mddev_resume(struct mddev *mddev); 734 extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, 735 struct mddev *mddev); 736 737 extern void md_reload_sb(struct mddev *mddev, int raid_disk); 738 extern void md_update_sb(struct mddev *mddev, int force); 739 extern void md_kick_rdev_from_array(struct md_rdev * rdev); 740 extern void mddev_create_wb_pool(struct mddev *mddev, struct md_rdev *rdev, 741 bool is_suspend); 742 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); 743 struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev); 744 745 static inline bool is_mddev_broken(struct md_rdev *rdev, const char *md_type) 746 { 747 int flags = rdev->bdev->bd_disk->flags; 748 749 if (!(flags & GENHD_FL_UP)) { 750 if (!test_and_set_bit(MD_BROKEN, &rdev->mddev->flags)) 751 pr_warn("md: %s: %s array has a missing/failed member\n", 752 mdname(rdev->mddev), md_type); 753 return true; 754 } 755 return false; 756 } 757 758 static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) 759 { 760 int faulty = test_bit(Faulty, &rdev->flags); 761 if (atomic_dec_and_test(&rdev->nr_pending) && faulty) { 762 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 763 md_wakeup_thread(mddev->thread); 764 } 765 } 766 767 extern struct md_cluster_operations *md_cluster_ops; 768 static inline int mddev_is_clustered(struct mddev *mddev) 769 { 770 return mddev->cluster_info && mddev->bitmap_info.nodes > 1; 771 } 772 773 /* clear unsupported mddev_flags */ 774 static inline void mddev_clear_unsupported_flags(struct mddev *mddev, 775 unsigned long unsupported_flags) 776 { 777 mddev->flags &= ~unsupported_flags; 778 } 779 780 static inline void mddev_check_writesame(struct mddev *mddev, struct bio *bio) 781 { 782 if (bio_op(bio) == REQ_OP_WRITE_SAME && 783 !bio->bi_disk->queue->limits.max_write_same_sectors) 784 mddev->queue->limits.max_write_same_sectors = 0; 785 } 786 787 static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio) 788 { 789 if (bio_op(bio) == REQ_OP_WRITE_ZEROES && 790 !bio->bi_disk->queue->limits.max_write_zeroes_sectors) 791 mddev->queue->limits.max_write_zeroes_sectors = 0; 792 } 793 #endif /* _MD_MD_H */ 794