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