1 /* 2 md.h : kernel internal structure of the Linux MD driver 3 Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2, or (at your option) 8 any later version. 9 10 You should have received a copy of the GNU General Public License 11 (for example /usr/src/linux/COPYING); if not, write to the Free 12 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 13 */ 14 15 #ifndef _MD_MD_H 16 #define _MD_MD_H 17 18 #include <linux/blkdev.h> 19 #include <linux/backing-dev.h> 20 #include <linux/kobject.h> 21 #include <linux/list.h> 22 #include <linux/mm.h> 23 #include <linux/mutex.h> 24 #include <linux/timer.h> 25 #include <linux/wait.h> 26 #include <linux/workqueue.h> 27 #include "md-cluster.h" 28 29 #define MaxSector (~(sector_t)0) 30 31 /* Bad block numbers are stored sorted in a single page. 32 * 64bits is used for each block or extent. 33 * 54 bits are sector number, 9 bits are extent size, 34 * 1 bit is an 'acknowledged' flag. 35 */ 36 #define MD_MAX_BADBLOCKS (PAGE_SIZE/8) 37 38 /* 39 * MD's 'extended' device 40 */ 41 struct md_rdev { 42 struct list_head same_set; /* RAID devices within the same set */ 43 44 sector_t sectors; /* Device size (in 512bytes sectors) */ 45 struct mddev *mddev; /* RAID array if running */ 46 int last_events; /* IO event timestamp */ 47 48 /* 49 * If meta_bdev is non-NULL, it means that a separate device is 50 * being used to store the metadata (superblock/bitmap) which 51 * would otherwise be contained on the same device as the data (bdev). 52 */ 53 struct block_device *meta_bdev; 54 struct block_device *bdev; /* block device handle */ 55 56 struct page *sb_page, *bb_page; 57 int sb_loaded; 58 __u64 sb_events; 59 sector_t data_offset; /* start of data in array */ 60 sector_t new_data_offset;/* only relevant while reshaping */ 61 sector_t sb_start; /* offset of the super block (in 512byte sectors) */ 62 int sb_size; /* bytes in the superblock */ 63 int preferred_minor; /* autorun support */ 64 65 struct kobject kobj; 66 67 /* A device can be in one of three states based on two flags: 68 * Not working: faulty==1 in_sync==0 69 * Fully working: faulty==0 in_sync==1 70 * Working, but not 71 * in sync with array 72 * faulty==0 in_sync==0 73 * 74 * It can never have faulty==1, in_sync==1 75 * This reduces the burden of testing multiple flags in many cases 76 */ 77 78 unsigned long flags; /* bit set of 'enum flag_bits' bits. */ 79 wait_queue_head_t blocked_wait; 80 81 int desc_nr; /* descriptor index in the superblock */ 82 int raid_disk; /* role of device in array */ 83 int new_raid_disk; /* role that the device will have in 84 * the array after a level-change completes. 85 */ 86 int saved_raid_disk; /* role that device used to have in the 87 * array and could again if we did a partial 88 * resync from the bitmap 89 */ 90 sector_t recovery_offset;/* If this device has been partially 91 * recovered, this is where we were 92 * up to. 93 */ 94 95 atomic_t nr_pending; /* number of pending requests. 96 * only maintained for arrays that 97 * support hot removal 98 */ 99 atomic_t read_errors; /* number of consecutive read errors that 100 * we have tried to ignore. 101 */ 102 struct timespec last_read_error; /* monotonic time since our 103 * last read error 104 */ 105 atomic_t corrected_errors; /* number of corrected read errors, 106 * for reporting to userspace and storing 107 * in superblock. 108 */ 109 struct work_struct del_work; /* used for delayed sysfs removal */ 110 111 struct kernfs_node *sysfs_state; /* handle for 'state' 112 * sysfs entry */ 113 114 struct badblocks { 115 int count; /* count of bad blocks */ 116 int unacked_exist; /* there probably are unacknowledged 117 * bad blocks. This is only cleared 118 * when a read discovers none 119 */ 120 int shift; /* shift from sectors to block size 121 * a -ve shift means badblocks are 122 * disabled.*/ 123 u64 *page; /* badblock list */ 124 int changed; 125 seqlock_t lock; 126 127 sector_t sector; 128 sector_t size; /* in sectors */ 129 } badblocks; 130 }; 131 enum flag_bits { 132 Faulty, /* device is known to have a fault */ 133 In_sync, /* device is in_sync with rest of array */ 134 Bitmap_sync, /* ..actually, not quite In_sync. Need a 135 * bitmap-based recovery to get fully in sync 136 */ 137 WriteMostly, /* Avoid reading if at all possible */ 138 AutoDetected, /* added by auto-detect */ 139 Blocked, /* An error occurred but has not yet 140 * been acknowledged by the metadata 141 * handler, so don't allow writes 142 * until it is cleared */ 143 WriteErrorSeen, /* A write error has been seen on this 144 * device 145 */ 146 FaultRecorded, /* Intermediate state for clearing 147 * Blocked. The Fault is/will-be 148 * recorded in the metadata, but that 149 * metadata hasn't been stored safely 150 * on disk yet. 151 */ 152 BlockedBadBlocks, /* A writer is blocked because they 153 * found an unacknowledged bad-block. 154 * This can safely be cleared at any 155 * time, and the writer will re-check. 156 * It may be set at any time, and at 157 * worst the writer will timeout and 158 * re-check. So setting it as 159 * accurately as possible is good, but 160 * not absolutely critical. 161 */ 162 WantReplacement, /* This device is a candidate to be 163 * hot-replaced, either because it has 164 * reported some faults, or because 165 * of explicit request. 166 */ 167 Replacement, /* This device is a replacement for 168 * a want_replacement device with same 169 * raid_disk number. 170 */ 171 Candidate, /* For clustered environments only: 172 * This device is seen locally but not 173 * by the whole cluster 174 */ 175 }; 176 177 #define BB_LEN_MASK (0x00000000000001FFULL) 178 #define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL) 179 #define BB_ACK_MASK (0x8000000000000000ULL) 180 #define BB_MAX_LEN 512 181 #define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9) 182 #define BB_LEN(x) (((x) & BB_LEN_MASK) + 1) 183 #define BB_ACK(x) (!!((x) & BB_ACK_MASK)) 184 #define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63)) 185 186 extern int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, 187 sector_t *first_bad, int *bad_sectors); 188 static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, 189 sector_t *first_bad, int *bad_sectors) 190 { 191 if (unlikely(rdev->badblocks.count)) { 192 int rv = md_is_badblock(&rdev->badblocks, rdev->data_offset + s, 193 sectors, 194 first_bad, bad_sectors); 195 if (rv) 196 *first_bad -= rdev->data_offset; 197 return rv; 198 } 199 return 0; 200 } 201 extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 202 int is_new); 203 extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 204 int is_new); 205 extern void md_ack_all_badblocks(struct badblocks *bb); 206 207 struct md_cluster_info; 208 209 struct mddev { 210 void *private; 211 struct md_personality *pers; 212 dev_t unit; 213 int md_minor; 214 struct list_head disks; 215 unsigned long flags; 216 #define MD_CHANGE_DEVS 0 /* Some device status has changed */ 217 #define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */ 218 #define MD_CHANGE_PENDING 2 /* switch from 'clean' to 'active' in progress */ 219 #define MD_UPDATE_SB_FLAGS (1 | 2 | 4) /* If these are set, md_update_sb needed */ 220 #define MD_ARRAY_FIRST_USE 3 /* First use of array, needs initialization */ 221 #define MD_STILL_CLOSED 4 /* If set, then array has not been opened since 222 * md_ioctl checked on it. 223 */ 224 225 int suspended; 226 atomic_t active_io; 227 int ro; 228 int sysfs_active; /* set when sysfs deletes 229 * are happening, so run/ 230 * takeover/stop are not safe 231 */ 232 int ready; /* See when safe to pass 233 * IO requests down */ 234 struct gendisk *gendisk; 235 236 struct kobject kobj; 237 int hold_active; 238 #define UNTIL_IOCTL 1 239 #define UNTIL_STOP 2 240 241 /* Superblock information */ 242 int major_version, 243 minor_version, 244 patch_version; 245 int persistent; 246 int external; /* metadata is 247 * managed externally */ 248 char metadata_type[17]; /* externally set*/ 249 int chunk_sectors; 250 time_t ctime, utime; 251 int level, layout; 252 char clevel[16]; 253 int raid_disks; 254 int max_disks; 255 sector_t dev_sectors; /* used size of 256 * component devices */ 257 sector_t array_sectors; /* exported array size */ 258 int external_size; /* size managed 259 * externally */ 260 __u64 events; 261 /* If the last 'event' was simply a clean->dirty transition, and 262 * we didn't write it to the spares, then it is safe and simple 263 * to just decrement the event count on a dirty->clean transition. 264 * So we record that possibility here. 265 */ 266 int can_decrease_events; 267 268 char uuid[16]; 269 270 /* If the array is being reshaped, we need to record the 271 * new shape and an indication of where we are up to. 272 * This is written to the superblock. 273 * If reshape_position is MaxSector, then no reshape is happening (yet). 274 */ 275 sector_t reshape_position; 276 int delta_disks, new_level, new_layout; 277 int new_chunk_sectors; 278 int reshape_backwards; 279 280 struct md_thread *thread; /* management thread */ 281 struct md_thread *sync_thread; /* doing resync or reconstruct */ 282 283 /* 'last_sync_action' is initialized to "none". It is set when a 284 * sync operation (i.e "data-check", "requested-resync", "resync", 285 * "recovery", or "reshape") is started. It holds this value even 286 * when the sync thread is "frozen" (interrupted) or "idle" (stopped 287 * or finished). It is overwritten when a new sync operation is begun. 288 */ 289 char *last_sync_action; 290 sector_t curr_resync; /* last block scheduled */ 291 /* As resync requests can complete out of order, we cannot easily track 292 * how much resync has been completed. So we occasionally pause until 293 * everything completes, then set curr_resync_completed to curr_resync. 294 * As such it may be well behind the real resync mark, but it is a value 295 * we are certain of. 296 */ 297 sector_t curr_resync_completed; 298 unsigned long resync_mark; /* a recent timestamp */ 299 sector_t resync_mark_cnt;/* blocks written at resync_mark */ 300 sector_t curr_mark_cnt; /* blocks scheduled now */ 301 302 sector_t resync_max_sectors; /* may be set by personality */ 303 304 atomic64_t resync_mismatches; /* count of sectors where 305 * parity/replica mismatch found 306 */ 307 308 /* allow user-space to request suspension of IO to regions of the array */ 309 sector_t suspend_lo; 310 sector_t suspend_hi; 311 /* if zero, use the system-wide default */ 312 int sync_speed_min; 313 int sync_speed_max; 314 315 /* resync even though the same disks are shared among md-devices */ 316 int parallel_resync; 317 318 int ok_start_degraded; 319 /* recovery/resync flags 320 * NEEDED: we might need to start a resync/recover 321 * RUNNING: a thread is running, or about to be started 322 * SYNC: actually doing a resync, not a recovery 323 * RECOVER: doing recovery, or need to try it. 324 * INTR: resync needs to be aborted for some reason 325 * DONE: thread is done and is waiting to be reaped 326 * REQUEST: user-space has requested a sync (used with SYNC) 327 * CHECK: user-space request for check-only, no repair 328 * RESHAPE: A reshape is happening 329 * ERROR: sync-action interrupted because io-error 330 * 331 * If neither SYNC or RESHAPE are set, then it is a recovery. 332 */ 333 #define MD_RECOVERY_RUNNING 0 334 #define MD_RECOVERY_SYNC 1 335 #define MD_RECOVERY_RECOVER 2 336 #define MD_RECOVERY_INTR 3 337 #define MD_RECOVERY_DONE 4 338 #define MD_RECOVERY_NEEDED 5 339 #define MD_RECOVERY_REQUESTED 6 340 #define MD_RECOVERY_CHECK 7 341 #define MD_RECOVERY_RESHAPE 8 342 #define MD_RECOVERY_FROZEN 9 343 #define MD_RECOVERY_ERROR 10 344 345 unsigned long recovery; 346 /* If a RAID personality determines that recovery (of a particular 347 * device) will fail due to a read error on the source device, it 348 * takes a copy of this number and does not attempt recovery again 349 * until this number changes. 350 */ 351 int recovery_disabled; 352 353 int in_sync; /* know to not need resync */ 354 /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so 355 * that we are never stopping an array while it is open. 356 * 'reconfig_mutex' protects all other reconfiguration. 357 * These locks are separate due to conflicting interactions 358 * with bdev->bd_mutex. 359 * Lock ordering is: 360 * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk 361 * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open 362 */ 363 struct mutex open_mutex; 364 struct mutex reconfig_mutex; 365 atomic_t active; /* general refcount */ 366 atomic_t openers; /* number of active opens */ 367 368 int changed; /* True if we might need to 369 * reread partition info */ 370 int degraded; /* whether md should consider 371 * adding a spare 372 */ 373 374 atomic_t recovery_active; /* blocks scheduled, but not written */ 375 wait_queue_head_t recovery_wait; 376 sector_t recovery_cp; 377 sector_t resync_min; /* user requested sync 378 * starts here */ 379 sector_t resync_max; /* resync should pause 380 * when it gets here */ 381 382 struct kernfs_node *sysfs_state; /* handle for 'array_state' 383 * file in sysfs. 384 */ 385 struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ 386 387 struct work_struct del_work; /* used for delayed sysfs removal */ 388 389 /* "lock" protects: 390 * flush_bio transition from NULL to !NULL 391 * rdev superblocks, events 392 * clearing MD_CHANGE_* 393 * in_sync - and related safemode and MD_CHANGE changes 394 * pers (also protected by reconfig_mutex and pending IO). 395 * clearing ->bitmap 396 * clearing ->bitmap_info.file 397 * changing ->resync_{min,max} 398 * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max}) 399 */ 400 spinlock_t lock; 401 wait_queue_head_t sb_wait; /* for waiting on superblock updates */ 402 atomic_t pending_writes; /* number of active superblock writes */ 403 404 unsigned int safemode; /* if set, update "clean" superblock 405 * when no writes pending. 406 */ 407 unsigned int safemode_delay; 408 struct timer_list safemode_timer; 409 atomic_t writes_pending; 410 struct request_queue *queue; /* for plugging ... */ 411 412 struct bitmap *bitmap; /* the bitmap for the device */ 413 struct { 414 struct file *file; /* the bitmap file */ 415 loff_t offset; /* offset from superblock of 416 * start of bitmap. May be 417 * negative, but not '0' 418 * For external metadata, offset 419 * from start of device. 420 */ 421 unsigned long space; /* space available at this offset */ 422 loff_t default_offset; /* this is the offset to use when 423 * hot-adding a bitmap. It should 424 * eventually be settable by sysfs. 425 */ 426 unsigned long default_space; /* space available at 427 * default offset */ 428 struct mutex mutex; 429 unsigned long chunksize; 430 unsigned long daemon_sleep; /* how many jiffies between updates? */ 431 unsigned long max_write_behind; /* write-behind mode */ 432 int external; 433 int nodes; /* Maximum number of nodes in the cluster */ 434 char cluster_name[64]; /* Name of the cluster */ 435 } bitmap_info; 436 437 atomic_t max_corr_read_errors; /* max read retries */ 438 struct list_head all_mddevs; 439 440 struct attribute_group *to_remove; 441 442 struct bio_set *bio_set; 443 444 /* Generic flush handling. 445 * The last to finish preflush schedules a worker to submit 446 * the rest of the request (without the REQ_FLUSH flag). 447 */ 448 struct bio *flush_bio; 449 atomic_t flush_pending; 450 struct work_struct flush_work; 451 struct work_struct event_work; /* used by dm to report failure event */ 452 void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); 453 struct md_cluster_info *cluster_info; 454 }; 455 456 static inline int __must_check mddev_lock(struct mddev *mddev) 457 { 458 return mutex_lock_interruptible(&mddev->reconfig_mutex); 459 } 460 461 /* Sometimes we need to take the lock in a situation where 462 * failure due to interrupts is not acceptable. 463 */ 464 static inline void mddev_lock_nointr(struct mddev *mddev) 465 { 466 mutex_lock(&mddev->reconfig_mutex); 467 } 468 469 static inline int mddev_is_locked(struct mddev *mddev) 470 { 471 return mutex_is_locked(&mddev->reconfig_mutex); 472 } 473 474 static inline int mddev_trylock(struct mddev *mddev) 475 { 476 return mutex_trylock(&mddev->reconfig_mutex); 477 } 478 extern void mddev_unlock(struct mddev *mddev); 479 480 static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) 481 { 482 atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); 483 } 484 485 struct md_personality 486 { 487 char *name; 488 int level; 489 struct list_head list; 490 struct module *owner; 491 void (*make_request)(struct mddev *mddev, struct bio *bio); 492 int (*run)(struct mddev *mddev); 493 void (*free)(struct mddev *mddev, void *priv); 494 void (*status)(struct seq_file *seq, struct mddev *mddev); 495 /* error_handler must set ->faulty and clear ->in_sync 496 * if appropriate, and should abort recovery if needed 497 */ 498 void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); 499 int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); 500 int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); 501 int (*spare_active) (struct mddev *mddev); 502 sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped); 503 int (*resize) (struct mddev *mddev, sector_t sectors); 504 sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); 505 int (*check_reshape) (struct mddev *mddev); 506 int (*start_reshape) (struct mddev *mddev); 507 void (*finish_reshape) (struct mddev *mddev); 508 /* quiesce moves between quiescence states 509 * 0 - fully active 510 * 1 - no new requests allowed 511 * others - reserved 512 */ 513 void (*quiesce) (struct mddev *mddev, int state); 514 /* takeover is used to transition an array from one 515 * personality to another. The new personality must be able 516 * to handle the data in the current layout. 517 * e.g. 2drive raid1 -> 2drive raid5 518 * ndrive raid5 -> degraded n+1drive raid6 with special layout 519 * If the takeover succeeds, a new 'private' structure is returned. 520 * This needs to be installed and then ->run used to activate the 521 * array. 522 */ 523 void *(*takeover) (struct mddev *mddev); 524 /* congested implements bdi.congested_fn(). 525 * Will not be called while array is 'suspended' */ 526 int (*congested)(struct mddev *mddev, int bits); 527 }; 528 529 struct md_sysfs_entry { 530 struct attribute attr; 531 ssize_t (*show)(struct mddev *, char *); 532 ssize_t (*store)(struct mddev *, const char *, size_t); 533 }; 534 extern struct attribute_group md_bitmap_group; 535 536 static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name) 537 { 538 if (sd) 539 return sysfs_get_dirent(sd, name); 540 return sd; 541 } 542 static inline void sysfs_notify_dirent_safe(struct kernfs_node *sd) 543 { 544 if (sd) 545 sysfs_notify_dirent(sd); 546 } 547 548 static inline char * mdname (struct mddev * mddev) 549 { 550 return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; 551 } 552 553 static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) 554 { 555 char nm[20]; 556 if (!test_bit(Replacement, &rdev->flags) && mddev->kobj.sd) { 557 sprintf(nm, "rd%d", rdev->raid_disk); 558 return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 559 } else 560 return 0; 561 } 562 563 static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) 564 { 565 char nm[20]; 566 if (!test_bit(Replacement, &rdev->flags) && mddev->kobj.sd) { 567 sprintf(nm, "rd%d", rdev->raid_disk); 568 sysfs_remove_link(&mddev->kobj, nm); 569 } 570 } 571 572 /* 573 * iterates through some rdev ringlist. It's safe to remove the 574 * current 'rdev'. Dont touch 'tmp' though. 575 */ 576 #define rdev_for_each_list(rdev, tmp, head) \ 577 list_for_each_entry_safe(rdev, tmp, head, same_set) 578 579 /* 580 * iterates through the 'same array disks' ringlist 581 */ 582 #define rdev_for_each(rdev, mddev) \ 583 list_for_each_entry(rdev, &((mddev)->disks), same_set) 584 585 #define rdev_for_each_safe(rdev, tmp, mddev) \ 586 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) 587 588 #define rdev_for_each_rcu(rdev, mddev) \ 589 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) 590 591 struct md_thread { 592 void (*run) (struct md_thread *thread); 593 struct mddev *mddev; 594 wait_queue_head_t wqueue; 595 unsigned long flags; 596 struct task_struct *tsk; 597 unsigned long timeout; 598 void *private; 599 }; 600 601 #define THREAD_WAKEUP 0 602 603 static inline void safe_put_page(struct page *p) 604 { 605 if (p) put_page(p); 606 } 607 608 extern int register_md_personality(struct md_personality *p); 609 extern int unregister_md_personality(struct md_personality *p); 610 extern int register_md_cluster_operations(struct md_cluster_operations *ops, 611 struct module *module); 612 extern int unregister_md_cluster_operations(void); 613 extern int md_setup_cluster(struct mddev *mddev, int nodes); 614 extern void md_cluster_stop(struct mddev *mddev); 615 extern struct md_thread *md_register_thread( 616 void (*run)(struct md_thread *thread), 617 struct mddev *mddev, 618 const char *name); 619 extern void md_unregister_thread(struct md_thread **threadp); 620 extern void md_wakeup_thread(struct md_thread *thread); 621 extern void md_check_recovery(struct mddev *mddev); 622 extern void md_reap_sync_thread(struct mddev *mddev); 623 extern void md_write_start(struct mddev *mddev, struct bio *bi); 624 extern void md_write_end(struct mddev *mddev); 625 extern void md_done_sync(struct mddev *mddev, int blocks, int ok); 626 extern void md_error(struct mddev *mddev, struct md_rdev *rdev); 627 extern void md_finish_reshape(struct mddev *mddev); 628 629 extern int mddev_congested(struct mddev *mddev, int bits); 630 extern void md_flush_request(struct mddev *mddev, struct bio *bio); 631 extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 632 sector_t sector, int size, struct page *page); 633 extern void md_super_wait(struct mddev *mddev); 634 extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 635 struct page *page, int rw, bool metadata_op); 636 extern void md_do_sync(struct md_thread *thread); 637 extern void md_new_event(struct mddev *mddev); 638 extern int md_allow_write(struct mddev *mddev); 639 extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); 640 extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); 641 extern int md_check_no_bitmap(struct mddev *mddev); 642 extern int md_integrity_register(struct mddev *mddev); 643 extern void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); 644 extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); 645 646 extern void mddev_init(struct mddev *mddev); 647 extern int md_run(struct mddev *mddev); 648 extern void md_stop(struct mddev *mddev); 649 extern void md_stop_writes(struct mddev *mddev); 650 extern int md_rdev_init(struct md_rdev *rdev); 651 extern void md_rdev_clear(struct md_rdev *rdev); 652 653 extern void mddev_suspend(struct mddev *mddev); 654 extern void mddev_resume(struct mddev *mddev); 655 extern struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, 656 struct mddev *mddev); 657 extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, 658 struct mddev *mddev); 659 660 extern void md_unplug(struct blk_plug_cb *cb, bool from_schedule); 661 extern void md_reload_sb(struct mddev *mddev); 662 extern void md_update_sb(struct mddev *mddev, int force); 663 extern void md_kick_rdev_from_array(struct md_rdev * rdev); 664 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); 665 static inline int mddev_check_plugged(struct mddev *mddev) 666 { 667 return !!blk_check_plugged(md_unplug, mddev, 668 sizeof(struct blk_plug_cb)); 669 } 670 671 static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) 672 { 673 int faulty = test_bit(Faulty, &rdev->flags); 674 if (atomic_dec_and_test(&rdev->nr_pending) && faulty) { 675 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 676 md_wakeup_thread(mddev->thread); 677 } 678 } 679 680 extern struct md_cluster_operations *md_cluster_ops; 681 static inline int mddev_is_clustered(struct mddev *mddev) 682 { 683 return mddev->cluster_info && mddev->bitmap_info.nodes > 1; 684 } 685 #endif /* _MD_MD_H */ 686