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 Unmerged, /* device is being added to array and should 138 * be considerred for bvec_merge_fn but not 139 * yet for actual IO 140 */ 141 WriteMostly, /* Avoid reading if at all possible */ 142 AutoDetected, /* added by auto-detect */ 143 Blocked, /* An error occurred but has not yet 144 * been acknowledged by the metadata 145 * handler, so don't allow writes 146 * until it is cleared */ 147 WriteErrorSeen, /* A write error has been seen on this 148 * device 149 */ 150 FaultRecorded, /* Intermediate state for clearing 151 * Blocked. The Fault is/will-be 152 * recorded in the metadata, but that 153 * metadata hasn't been stored safely 154 * on disk yet. 155 */ 156 BlockedBadBlocks, /* A writer is blocked because they 157 * found an unacknowledged bad-block. 158 * This can safely be cleared at any 159 * time, and the writer will re-check. 160 * It may be set at any time, and at 161 * worst the writer will timeout and 162 * re-check. So setting it as 163 * accurately as possible is good, but 164 * not absolutely critical. 165 */ 166 WantReplacement, /* This device is a candidate to be 167 * hot-replaced, either because it has 168 * reported some faults, or because 169 * of explicit request. 170 */ 171 Replacement, /* This device is a replacement for 172 * a want_replacement device with same 173 * raid_disk number. 174 */ 175 Candidate, /* For clustered environments only: 176 * This device is seen locally but not 177 * by the whole cluster 178 */ 179 }; 180 181 #define BB_LEN_MASK (0x00000000000001FFULL) 182 #define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL) 183 #define BB_ACK_MASK (0x8000000000000000ULL) 184 #define BB_MAX_LEN 512 185 #define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9) 186 #define BB_LEN(x) (((x) & BB_LEN_MASK) + 1) 187 #define BB_ACK(x) (!!((x) & BB_ACK_MASK)) 188 #define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63)) 189 190 extern int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, 191 sector_t *first_bad, int *bad_sectors); 192 static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, 193 sector_t *first_bad, int *bad_sectors) 194 { 195 if (unlikely(rdev->badblocks.count)) { 196 int rv = md_is_badblock(&rdev->badblocks, rdev->data_offset + s, 197 sectors, 198 first_bad, bad_sectors); 199 if (rv) 200 *first_bad -= rdev->data_offset; 201 return rv; 202 } 203 return 0; 204 } 205 extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 206 int is_new); 207 extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, 208 int is_new); 209 extern void md_ack_all_badblocks(struct badblocks *bb); 210 211 struct md_cluster_info; 212 213 struct mddev { 214 void *private; 215 struct md_personality *pers; 216 dev_t unit; 217 int md_minor; 218 struct list_head disks; 219 unsigned long flags; 220 #define MD_CHANGE_DEVS 0 /* Some device status has changed */ 221 #define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */ 222 #define MD_CHANGE_PENDING 2 /* switch from 'clean' to 'active' in progress */ 223 #define MD_UPDATE_SB_FLAGS (1 | 2 | 4) /* If these are set, md_update_sb needed */ 224 #define MD_ARRAY_FIRST_USE 3 /* First use of array, needs initialization */ 225 #define MD_STILL_CLOSED 4 /* If set, then array has not been opened since 226 * md_ioctl checked on it. 227 */ 228 229 int suspended; 230 atomic_t active_io; 231 int ro; 232 int sysfs_active; /* set when sysfs deletes 233 * are happening, so run/ 234 * takeover/stop are not safe 235 */ 236 int ready; /* See when safe to pass 237 * IO requests down */ 238 struct gendisk *gendisk; 239 240 struct kobject kobj; 241 int hold_active; 242 #define UNTIL_IOCTL 1 243 #define UNTIL_STOP 2 244 245 /* Superblock information */ 246 int major_version, 247 minor_version, 248 patch_version; 249 int persistent; 250 int external; /* metadata is 251 * managed externally */ 252 char metadata_type[17]; /* externally set*/ 253 int chunk_sectors; 254 time_t ctime, utime; 255 int level, layout; 256 char clevel[16]; 257 int raid_disks; 258 int max_disks; 259 sector_t dev_sectors; /* used size of 260 * component devices */ 261 sector_t array_sectors; /* exported array size */ 262 int external_size; /* size managed 263 * externally */ 264 __u64 events; 265 /* If the last 'event' was simply a clean->dirty transition, and 266 * we didn't write it to the spares, then it is safe and simple 267 * to just decrement the event count on a dirty->clean transition. 268 * So we record that possibility here. 269 */ 270 int can_decrease_events; 271 272 char uuid[16]; 273 274 /* If the array is being reshaped, we need to record the 275 * new shape and an indication of where we are up to. 276 * This is written to the superblock. 277 * If reshape_position is MaxSector, then no reshape is happening (yet). 278 */ 279 sector_t reshape_position; 280 int delta_disks, new_level, new_layout; 281 int new_chunk_sectors; 282 int reshape_backwards; 283 284 struct md_thread *thread; /* management thread */ 285 struct md_thread *sync_thread; /* doing resync or reconstruct */ 286 287 /* 'last_sync_action' is initialized to "none". It is set when a 288 * sync operation (i.e "data-check", "requested-resync", "resync", 289 * "recovery", or "reshape") is started. It holds this value even 290 * when the sync thread is "frozen" (interrupted) or "idle" (stopped 291 * or finished). It is overwritten when a new sync operation is begun. 292 */ 293 char *last_sync_action; 294 sector_t curr_resync; /* last block scheduled */ 295 /* As resync requests can complete out of order, we cannot easily track 296 * how much resync has been completed. So we occasionally pause until 297 * everything completes, then set curr_resync_completed to curr_resync. 298 * As such it may be well behind the real resync mark, but it is a value 299 * we are certain of. 300 */ 301 sector_t curr_resync_completed; 302 unsigned long resync_mark; /* a recent timestamp */ 303 sector_t resync_mark_cnt;/* blocks written at resync_mark */ 304 sector_t curr_mark_cnt; /* blocks scheduled now */ 305 306 sector_t resync_max_sectors; /* may be set by personality */ 307 308 atomic64_t resync_mismatches; /* count of sectors where 309 * parity/replica mismatch found 310 */ 311 312 /* allow user-space to request suspension of IO to regions of the array */ 313 sector_t suspend_lo; 314 sector_t suspend_hi; 315 /* if zero, use the system-wide default */ 316 int sync_speed_min; 317 int sync_speed_max; 318 319 /* resync even though the same disks are shared among md-devices */ 320 int parallel_resync; 321 322 int ok_start_degraded; 323 /* recovery/resync flags 324 * NEEDED: we might need to start a resync/recover 325 * RUNNING: a thread is running, or about to be started 326 * SYNC: actually doing a resync, not a recovery 327 * RECOVER: doing recovery, or need to try it. 328 * INTR: resync needs to be aborted for some reason 329 * DONE: thread is done and is waiting to be reaped 330 * REQUEST: user-space has requested a sync (used with SYNC) 331 * CHECK: user-space request for check-only, no repair 332 * RESHAPE: A reshape is happening 333 * ERROR: sync-action interrupted because io-error 334 * 335 * If neither SYNC or RESHAPE are set, then it is a recovery. 336 */ 337 #define MD_RECOVERY_RUNNING 0 338 #define MD_RECOVERY_SYNC 1 339 #define MD_RECOVERY_RECOVER 2 340 #define MD_RECOVERY_INTR 3 341 #define MD_RECOVERY_DONE 4 342 #define MD_RECOVERY_NEEDED 5 343 #define MD_RECOVERY_REQUESTED 6 344 #define MD_RECOVERY_CHECK 7 345 #define MD_RECOVERY_RESHAPE 8 346 #define MD_RECOVERY_FROZEN 9 347 #define MD_RECOVERY_ERROR 10 348 349 unsigned long recovery; 350 /* If a RAID personality determines that recovery (of a particular 351 * device) will fail due to a read error on the source device, it 352 * takes a copy of this number and does not attempt recovery again 353 * until this number changes. 354 */ 355 int recovery_disabled; 356 357 int in_sync; /* know to not need resync */ 358 /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so 359 * that we are never stopping an array while it is open. 360 * 'reconfig_mutex' protects all other reconfiguration. 361 * These locks are separate due to conflicting interactions 362 * with bdev->bd_mutex. 363 * Lock ordering is: 364 * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk 365 * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open 366 */ 367 struct mutex open_mutex; 368 struct mutex reconfig_mutex; 369 atomic_t active; /* general refcount */ 370 atomic_t openers; /* number of active opens */ 371 372 int changed; /* True if we might need to 373 * reread partition info */ 374 int degraded; /* whether md should consider 375 * adding a spare 376 */ 377 int merge_check_needed; /* at least one 378 * member device 379 * has a 380 * merge_bvec_fn */ 381 382 atomic_t recovery_active; /* blocks scheduled, but not written */ 383 wait_queue_head_t recovery_wait; 384 sector_t recovery_cp; 385 sector_t resync_min; /* user requested sync 386 * starts here */ 387 sector_t resync_max; /* resync should pause 388 * when it gets here */ 389 390 struct kernfs_node *sysfs_state; /* handle for 'array_state' 391 * file in sysfs. 392 */ 393 struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ 394 395 struct work_struct del_work; /* used for delayed sysfs removal */ 396 397 /* "lock" protects: 398 * flush_bio transition from NULL to !NULL 399 * rdev superblocks, events 400 * clearing MD_CHANGE_* 401 * in_sync - and related safemode and MD_CHANGE changes 402 * pers (also protected by reconfig_mutex and pending IO). 403 * clearing ->bitmap 404 * clearing ->bitmap_info.file 405 * changing ->resync_{min,max} 406 * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max}) 407 */ 408 spinlock_t lock; 409 wait_queue_head_t sb_wait; /* for waiting on superblock updates */ 410 atomic_t pending_writes; /* number of active superblock writes */ 411 412 unsigned int safemode; /* if set, update "clean" superblock 413 * when no writes pending. 414 */ 415 unsigned int safemode_delay; 416 struct timer_list safemode_timer; 417 atomic_t writes_pending; 418 struct request_queue *queue; /* for plugging ... */ 419 420 struct bitmap *bitmap; /* the bitmap for the device */ 421 struct { 422 struct file *file; /* the bitmap file */ 423 loff_t offset; /* offset from superblock of 424 * start of bitmap. May be 425 * negative, but not '0' 426 * For external metadata, offset 427 * from start of device. 428 */ 429 unsigned long space; /* space available at this offset */ 430 loff_t default_offset; /* this is the offset to use when 431 * hot-adding a bitmap. It should 432 * eventually be settable by sysfs. 433 */ 434 unsigned long default_space; /* space available at 435 * default offset */ 436 struct mutex mutex; 437 unsigned long chunksize; 438 unsigned long daemon_sleep; /* how many jiffies between updates? */ 439 unsigned long max_write_behind; /* write-behind mode */ 440 int external; 441 int nodes; /* Maximum number of nodes in the cluster */ 442 char cluster_name[64]; /* Name of the cluster */ 443 } bitmap_info; 444 445 atomic_t max_corr_read_errors; /* max read retries */ 446 struct list_head all_mddevs; 447 448 struct attribute_group *to_remove; 449 450 struct bio_set *bio_set; 451 452 /* Generic flush handling. 453 * The last to finish preflush schedules a worker to submit 454 * the rest of the request (without the REQ_FLUSH flag). 455 */ 456 struct bio *flush_bio; 457 atomic_t flush_pending; 458 struct work_struct flush_work; 459 struct work_struct event_work; /* used by dm to report failure event */ 460 void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); 461 struct md_cluster_info *cluster_info; 462 }; 463 464 static inline int __must_check mddev_lock(struct mddev *mddev) 465 { 466 return mutex_lock_interruptible(&mddev->reconfig_mutex); 467 } 468 469 /* Sometimes we need to take the lock in a situation where 470 * failure due to interrupts is not acceptable. 471 */ 472 static inline void mddev_lock_nointr(struct mddev *mddev) 473 { 474 mutex_lock(&mddev->reconfig_mutex); 475 } 476 477 static inline int mddev_is_locked(struct mddev *mddev) 478 { 479 return mutex_is_locked(&mddev->reconfig_mutex); 480 } 481 482 static inline int mddev_trylock(struct mddev *mddev) 483 { 484 return mutex_trylock(&mddev->reconfig_mutex); 485 } 486 extern void mddev_unlock(struct mddev *mddev); 487 488 static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) 489 { 490 atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); 491 } 492 493 struct md_personality 494 { 495 char *name; 496 int level; 497 struct list_head list; 498 struct module *owner; 499 void (*make_request)(struct mddev *mddev, struct bio *bio); 500 int (*run)(struct mddev *mddev); 501 void (*free)(struct mddev *mddev, void *priv); 502 void (*status)(struct seq_file *seq, struct mddev *mddev); 503 /* error_handler must set ->faulty and clear ->in_sync 504 * if appropriate, and should abort recovery if needed 505 */ 506 void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); 507 int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); 508 int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); 509 int (*spare_active) (struct mddev *mddev); 510 sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped); 511 int (*resize) (struct mddev *mddev, sector_t sectors); 512 sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); 513 int (*check_reshape) (struct mddev *mddev); 514 int (*start_reshape) (struct mddev *mddev); 515 void (*finish_reshape) (struct mddev *mddev); 516 /* quiesce moves between quiescence states 517 * 0 - fully active 518 * 1 - no new requests allowed 519 * others - reserved 520 */ 521 void (*quiesce) (struct mddev *mddev, int state); 522 /* takeover is used to transition an array from one 523 * personality to another. The new personality must be able 524 * to handle the data in the current layout. 525 * e.g. 2drive raid1 -> 2drive raid5 526 * ndrive raid5 -> degraded n+1drive raid6 with special layout 527 * If the takeover succeeds, a new 'private' structure is returned. 528 * This needs to be installed and then ->run used to activate the 529 * array. 530 */ 531 void *(*takeover) (struct mddev *mddev); 532 /* congested implements bdi.congested_fn(). 533 * Will not be called while array is 'suspended' */ 534 int (*congested)(struct mddev *mddev, int bits); 535 /* mergeable_bvec is use to implement ->merge_bvec_fn */ 536 int (*mergeable_bvec)(struct mddev *mddev, 537 struct bvec_merge_data *bvm, 538 struct bio_vec *biovec); 539 }; 540 541 struct md_sysfs_entry { 542 struct attribute attr; 543 ssize_t (*show)(struct mddev *, char *); 544 ssize_t (*store)(struct mddev *, const char *, size_t); 545 }; 546 extern struct attribute_group md_bitmap_group; 547 548 static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name) 549 { 550 if (sd) 551 return sysfs_get_dirent(sd, name); 552 return sd; 553 } 554 static inline void sysfs_notify_dirent_safe(struct kernfs_node *sd) 555 { 556 if (sd) 557 sysfs_notify_dirent(sd); 558 } 559 560 static inline char * mdname (struct mddev * mddev) 561 { 562 return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; 563 } 564 565 static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) 566 { 567 char nm[20]; 568 if (!test_bit(Replacement, &rdev->flags) && mddev->kobj.sd) { 569 sprintf(nm, "rd%d", rdev->raid_disk); 570 return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); 571 } else 572 return 0; 573 } 574 575 static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) 576 { 577 char nm[20]; 578 if (!test_bit(Replacement, &rdev->flags) && mddev->kobj.sd) { 579 sprintf(nm, "rd%d", rdev->raid_disk); 580 sysfs_remove_link(&mddev->kobj, nm); 581 } 582 } 583 584 /* 585 * iterates through some rdev ringlist. It's safe to remove the 586 * current 'rdev'. Dont touch 'tmp' though. 587 */ 588 #define rdev_for_each_list(rdev, tmp, head) \ 589 list_for_each_entry_safe(rdev, tmp, head, same_set) 590 591 /* 592 * iterates through the 'same array disks' ringlist 593 */ 594 #define rdev_for_each(rdev, mddev) \ 595 list_for_each_entry(rdev, &((mddev)->disks), same_set) 596 597 #define rdev_for_each_safe(rdev, tmp, mddev) \ 598 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) 599 600 #define rdev_for_each_rcu(rdev, mddev) \ 601 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) 602 603 struct md_thread { 604 void (*run) (struct md_thread *thread); 605 struct mddev *mddev; 606 wait_queue_head_t wqueue; 607 unsigned long flags; 608 struct task_struct *tsk; 609 unsigned long timeout; 610 void *private; 611 }; 612 613 #define THREAD_WAKEUP 0 614 615 static inline void safe_put_page(struct page *p) 616 { 617 if (p) put_page(p); 618 } 619 620 extern int register_md_personality(struct md_personality *p); 621 extern int unregister_md_personality(struct md_personality *p); 622 extern int register_md_cluster_operations(struct md_cluster_operations *ops, 623 struct module *module); 624 extern int unregister_md_cluster_operations(void); 625 extern int md_setup_cluster(struct mddev *mddev, int nodes); 626 extern void md_cluster_stop(struct mddev *mddev); 627 extern struct md_thread *md_register_thread( 628 void (*run)(struct md_thread *thread), 629 struct mddev *mddev, 630 const char *name); 631 extern void md_unregister_thread(struct md_thread **threadp); 632 extern void md_wakeup_thread(struct md_thread *thread); 633 extern void md_check_recovery(struct mddev *mddev); 634 extern void md_reap_sync_thread(struct mddev *mddev); 635 extern void md_write_start(struct mddev *mddev, struct bio *bi); 636 extern void md_write_end(struct mddev *mddev); 637 extern void md_done_sync(struct mddev *mddev, int blocks, int ok); 638 extern void md_error(struct mddev *mddev, struct md_rdev *rdev); 639 extern void md_finish_reshape(struct mddev *mddev); 640 641 extern int mddev_congested(struct mddev *mddev, int bits); 642 extern void md_flush_request(struct mddev *mddev, struct bio *bio); 643 extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, 644 sector_t sector, int size, struct page *page); 645 extern void md_super_wait(struct mddev *mddev); 646 extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, 647 struct page *page, int rw, bool metadata_op); 648 extern void md_do_sync(struct md_thread *thread); 649 extern void md_new_event(struct mddev *mddev); 650 extern int md_allow_write(struct mddev *mddev); 651 extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); 652 extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); 653 extern int md_check_no_bitmap(struct mddev *mddev); 654 extern int md_integrity_register(struct mddev *mddev); 655 extern void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); 656 extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); 657 658 extern void mddev_init(struct mddev *mddev); 659 extern int md_run(struct mddev *mddev); 660 extern void md_stop(struct mddev *mddev); 661 extern void md_stop_writes(struct mddev *mddev); 662 extern int md_rdev_init(struct md_rdev *rdev); 663 extern void md_rdev_clear(struct md_rdev *rdev); 664 665 extern void mddev_suspend(struct mddev *mddev); 666 extern void mddev_resume(struct mddev *mddev); 667 extern struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, 668 struct mddev *mddev); 669 extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, 670 struct mddev *mddev); 671 672 extern void md_unplug(struct blk_plug_cb *cb, bool from_schedule); 673 extern void md_reload_sb(struct mddev *mddev); 674 extern void md_update_sb(struct mddev *mddev, int force); 675 extern void md_kick_rdev_from_array(struct md_rdev * rdev); 676 struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); 677 static inline int mddev_check_plugged(struct mddev *mddev) 678 { 679 return !!blk_check_plugged(md_unplug, mddev, 680 sizeof(struct blk_plug_cb)); 681 } 682 683 static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) 684 { 685 int faulty = test_bit(Faulty, &rdev->flags); 686 if (atomic_dec_and_test(&rdev->nr_pending) && faulty) { 687 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 688 md_wakeup_thread(mddev->thread); 689 } 690 } 691 692 extern struct md_cluster_operations *md_cluster_ops; 693 static inline int mddev_is_clustered(struct mddev *mddev) 694 { 695 return mddev->cluster_info && mddev->bitmap_info.nodes > 1; 696 } 697 #endif /* _MD_MD_H */ 698