1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 md.h : kernel internal structure of the Linux MD driver
4 Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
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>
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"
23 #define MaxSector (~(sector_t)0)
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
34 #define MD_FAILFAST (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT)
36 * MD's 'extended' device
39 struct list_head same_set
; /* RAID devices within the same set */
41 sector_t sectors
; /* Device size (in 512bytes sectors) */
42 struct mddev
*mddev
; /* RAID array if running */
43 int last_events
; /* IO event timestamp */
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).
50 struct block_device
*meta_bdev
;
51 struct block_device
*bdev
; /* block device handle */
53 struct page
*sb_page
, *bb_page
;
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 */
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
69 * faulty==0 in_sync==0
71 * It can never have faulty==1, in_sync==1
72 * This reduces the burden of testing multiple flags in many cases
75 unsigned long flags
; /* bit set of 'enum flag_bits' bits. */
76 wait_queue_head_t blocked_wait
;
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.
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
88 sector_t recovery_offset
;/* If this device has been partially
89 * recovered, this is where we were
92 sector_t journal_tail
; /* If this device is a journal device,
93 * this is the journal tail (journal
94 * recovery start point)
98 atomic_t nr_pending
; /* number of pending requests.
99 * only maintained for arrays that
100 * support hot removal
102 atomic_t read_errors
; /* number of consecutive read errors that
103 * we have tried to ignore.
105 time64_t last_read_error
; /* monotonic time since our
108 atomic_t corrected_errors
; /* number of corrected read errors,
109 * for reporting to userspace and storing
112 struct work_struct del_work
; /* used for delayed sysfs removal */
114 struct kernfs_node
*sysfs_state
; /* handle for 'state'
117 struct badblocks badblocks
;
120 short offset
; /* Offset from superblock to start of PPL.
121 * Not used by external metadata. */
122 unsigned int size
; /* Size in sectors of the PPL space */
123 sector_t sector
; /* First sector of the PPL space */
127 Faulty
, /* device is known to have a fault */
128 In_sync
, /* device is in_sync with rest of array */
129 Bitmap_sync
, /* ..actually, not quite In_sync. Need a
130 * bitmap-based recovery to get fully in sync.
131 * The bit is only meaningful before device
132 * has been passed to pers->hot_add_disk.
134 WriteMostly
, /* Avoid reading if at all possible */
135 AutoDetected
, /* added by auto-detect */
136 Blocked
, /* An error occurred but has not yet
137 * been acknowledged by the metadata
138 * handler, so don't allow writes
139 * until it is cleared */
140 WriteErrorSeen
, /* A write error has been seen on this
143 FaultRecorded
, /* Intermediate state for clearing
144 * Blocked. The Fault is/will-be
145 * recorded in the metadata, but that
146 * metadata hasn't been stored safely
149 BlockedBadBlocks
, /* A writer is blocked because they
150 * found an unacknowledged bad-block.
151 * This can safely be cleared at any
152 * time, and the writer will re-check.
153 * It may be set at any time, and at
154 * worst the writer will timeout and
155 * re-check. So setting it as
156 * accurately as possible is good, but
157 * not absolutely critical.
159 WantReplacement
, /* This device is a candidate to be
160 * hot-replaced, either because it has
161 * reported some faults, or because
162 * of explicit request.
164 Replacement
, /* This device is a replacement for
165 * a want_replacement device with same
168 Candidate
, /* For clustered environments only:
169 * This device is seen locally but not
170 * by the whole cluster
172 Journal
, /* This device is used as journal for
174 * Usually, this device should be faster
175 * than other devices in the array
178 RemoveSynchronized
, /* synchronize_rcu() was called after
179 * this device was known to be faulty,
180 * so it is safe to remove without
181 * another synchronize_rcu() call.
183 ExternalBbl
, /* External metadata provides bad
184 * block management for a disk
186 FailFast
, /* Minimal retries should be attempted on
187 * this device, so use REQ_FAILFAST_DEV.
188 * Also don't try to repair failed reads.
189 * It is expects that no bad block log
192 LastDev
, /* Seems to be the last working dev as
193 * it didn't fail, so don't use FailFast
194 * any more for metadata
198 static inline int is_badblock(struct md_rdev
*rdev
, sector_t s
, int sectors
,
199 sector_t
*first_bad
, int *bad_sectors
)
201 if (unlikely(rdev
->badblocks
.count
)) {
202 int rv
= badblocks_check(&rdev
->badblocks
, rdev
->data_offset
+ s
,
204 first_bad
, bad_sectors
);
206 *first_bad
-= rdev
->data_offset
;
211 extern int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
213 extern int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
215 struct md_cluster_info
;
217 /* change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added */
219 MD_ARRAY_FIRST_USE
, /* First use of array, needs initialization */
220 MD_CLOSING
, /* If set, we are closing the array, do not open
222 MD_JOURNAL_CLEAN
, /* A raid with journal is already clean */
223 MD_HAS_JOURNAL
, /* The raid array has journal feature set */
224 MD_CLUSTER_RESYNC_LOCKED
, /* cluster raid only, which means node
225 * already took resync lock, need to
226 * release the lock */
227 MD_FAILFAST_SUPPORTED
, /* Using MD_FAILFAST on metadata writes is
228 * supported as calls to md_error() will
229 * never cause the array to become failed.
231 MD_HAS_PPL
, /* The raid array has PPL feature set */
232 MD_HAS_MULTIPLE_PPLS
, /* The raid array has multiple PPLs feature set */
233 MD_ALLOW_SB_UPDATE
, /* md_check_recovery is allowed to update
234 * the metadata without taking reconfig_mutex.
236 MD_UPDATING_SB
, /* md_check_recovery is updating the metadata
237 * without explicitly holding reconfig_mutex.
241 enum mddev_sb_flags
{
242 MD_SB_CHANGE_DEVS
, /* Some device status has changed */
243 MD_SB_CHANGE_CLEAN
, /* transition to or from 'clean' */
244 MD_SB_CHANGE_PENDING
, /* switch from 'clean' to 'active' in progress */
245 MD_SB_NEED_REWRITE
, /* metadata write needs to be repeated */
250 struct md_personality
*pers
;
253 struct list_head disks
;
255 unsigned long sb_flags
;
260 int sysfs_active
; /* set when sysfs deletes
261 * are happening, so run/
262 * takeover/stop are not safe
264 struct gendisk
*gendisk
;
268 #define UNTIL_IOCTL 1
271 /* Superblock information */
276 int external
; /* metadata is
277 * managed externally */
278 char metadata_type
[17]; /* externally set*/
280 time64_t ctime
, utime
;
285 sector_t dev_sectors
; /* used size of
286 * component devices */
287 sector_t array_sectors
; /* exported array size */
288 int external_size
; /* size managed
291 /* If the last 'event' was simply a clean->dirty transition, and
292 * we didn't write it to the spares, then it is safe and simple
293 * to just decrement the event count on a dirty->clean transition.
294 * So we record that possibility here.
296 int can_decrease_events
;
300 /* If the array is being reshaped, we need to record the
301 * new shape and an indication of where we are up to.
302 * This is written to the superblock.
303 * If reshape_position is MaxSector, then no reshape is happening (yet).
305 sector_t reshape_position
;
306 int delta_disks
, new_level
, new_layout
;
307 int new_chunk_sectors
;
308 int reshape_backwards
;
310 struct md_thread
*thread
; /* management thread */
311 struct md_thread
*sync_thread
; /* doing resync or reconstruct */
313 /* 'last_sync_action' is initialized to "none". It is set when a
314 * sync operation (i.e "data-check", "requested-resync", "resync",
315 * "recovery", or "reshape") is started. It holds this value even
316 * when the sync thread is "frozen" (interrupted) or "idle" (stopped
317 * or finished). It is overwritten when a new sync operation is begun.
319 char *last_sync_action
;
320 sector_t curr_resync
; /* last block scheduled */
321 /* As resync requests can complete out of order, we cannot easily track
322 * how much resync has been completed. So we occasionally pause until
323 * everything completes, then set curr_resync_completed to curr_resync.
324 * As such it may be well behind the real resync mark, but it is a value
327 sector_t curr_resync_completed
;
328 unsigned long resync_mark
; /* a recent timestamp */
329 sector_t resync_mark_cnt
;/* blocks written at resync_mark */
330 sector_t curr_mark_cnt
; /* blocks scheduled now */
332 sector_t resync_max_sectors
; /* may be set by personality */
334 atomic64_t resync_mismatches
; /* count of sectors where
335 * parity/replica mismatch found
338 /* allow user-space to request suspension of IO to regions of the array */
341 /* if zero, use the system-wide default */
345 /* resync even though the same disks are shared among md-devices */
348 int ok_start_degraded
;
350 unsigned long recovery
;
351 /* If a RAID personality determines that recovery (of a particular
352 * device) will fail due to a read error on the source device, it
353 * takes a copy of this number and does not attempt recovery again
354 * until this number changes.
356 int recovery_disabled
;
358 int in_sync
; /* know to not need resync */
359 /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so
360 * that we are never stopping an array while it is open.
361 * 'reconfig_mutex' protects all other reconfiguration.
362 * These locks are separate due to conflicting interactions
363 * with bdev->bd_mutex.
365 * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk
366 * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open
368 struct mutex open_mutex
;
369 struct mutex reconfig_mutex
;
370 atomic_t active
; /* general refcount */
371 atomic_t openers
; /* number of active opens */
373 int changed
; /* True if we might need to
374 * reread partition info */
375 int degraded
; /* whether md should consider
379 atomic_t recovery_active
; /* blocks scheduled, but not written */
380 wait_queue_head_t recovery_wait
;
381 sector_t recovery_cp
;
382 sector_t resync_min
; /* user requested sync
384 sector_t resync_max
; /* resync should pause
385 * when it gets here */
387 struct kernfs_node
*sysfs_state
; /* handle for 'array_state'
390 struct kernfs_node
*sysfs_action
; /* handle for 'sync_action' */
392 struct work_struct del_work
; /* used for delayed sysfs removal */
395 * flush_bio transition from NULL to !NULL
396 * rdev superblocks, events
397 * clearing MD_CHANGE_*
398 * in_sync - and related safemode and MD_CHANGE changes
399 * pers (also protected by reconfig_mutex and pending IO).
401 * clearing ->bitmap_info.file
402 * changing ->resync_{min,max}
403 * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max})
406 wait_queue_head_t sb_wait
; /* for waiting on superblock updates */
407 atomic_t pending_writes
; /* number of active superblock writes */
409 unsigned int safemode
; /* if set, update "clean" superblock
410 * when no writes pending.
412 unsigned int safemode_delay
;
413 struct timer_list safemode_timer
;
414 struct percpu_ref writes_pending
;
415 int sync_checkers
; /* # of threads checking writes_pending */
416 struct request_queue
*queue
; /* for plugging ... */
418 struct bitmap
*bitmap
; /* the bitmap for the device */
420 struct file
*file
; /* the bitmap file */
421 loff_t offset
; /* offset from superblock of
422 * start of bitmap. May be
423 * negative, but not '0'
424 * For external metadata, offset
425 * from start of device.
427 unsigned long space
; /* space available at this offset */
428 loff_t default_offset
; /* this is the offset to use when
429 * hot-adding a bitmap. It should
430 * eventually be settable by sysfs.
432 unsigned long default_space
; /* space available at
435 unsigned long chunksize
;
436 unsigned long daemon_sleep
; /* how many jiffies between updates? */
437 unsigned long max_write_behind
; /* write-behind mode */
439 int nodes
; /* Maximum number of nodes in the cluster */
440 char cluster_name
[64]; /* Name of the cluster */
443 atomic_t max_corr_read_errors
; /* max read retries */
444 struct list_head all_mddevs
;
446 struct attribute_group
*to_remove
;
448 struct bio_set bio_set
;
449 struct bio_set sync_set
; /* for sync operations like
450 * metadata and bitmap writes
453 /* Generic flush handling.
454 * The last to finish preflush schedules a worker to submit
455 * the rest of the request (without the REQ_PREFLUSH flag).
457 struct bio
*flush_bio
;
458 atomic_t flush_pending
;
459 ktime_t start_flush
, last_flush
; /* last_flush is when the last completed
462 struct work_struct flush_work
;
463 struct work_struct event_work
; /* used by dm to report failure event */
464 void (*sync_super
)(struct mddev
*mddev
, struct md_rdev
*rdev
);
465 struct md_cluster_info
*cluster_info
;
466 unsigned int good_device_nr
; /* good device num within cluster raid */
468 bool has_superblocks
:1;
471 enum recovery_flags
{
473 * If neither SYNC or RESHAPE are set, then it is a recovery.
475 MD_RECOVERY_RUNNING
, /* a thread is running, or about to be started */
476 MD_RECOVERY_SYNC
, /* actually doing a resync, not a recovery */
477 MD_RECOVERY_RECOVER
, /* doing recovery, or need to try it. */
478 MD_RECOVERY_INTR
, /* resync needs to be aborted for some reason */
479 MD_RECOVERY_DONE
, /* thread is done and is waiting to be reaped */
480 MD_RECOVERY_NEEDED
, /* we might need to start a resync/recover */
481 MD_RECOVERY_REQUESTED
, /* user-space has requested a sync (used with SYNC) */
482 MD_RECOVERY_CHECK
, /* user-space request for check-only, no repair */
483 MD_RECOVERY_RESHAPE
, /* A reshape is happening */
484 MD_RECOVERY_FROZEN
, /* User request to abort, and not restart, any action */
485 MD_RECOVERY_ERROR
, /* sync-action interrupted because io-error */
486 MD_RECOVERY_WAIT
, /* waiting for pers->start() to finish */
487 MD_RESYNCING_REMOTE
, /* remote node is running resync thread */
490 static inline int __must_check
mddev_lock(struct mddev
*mddev
)
492 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
495 /* Sometimes we need to take the lock in a situation where
496 * failure due to interrupts is not acceptable.
498 static inline void mddev_lock_nointr(struct mddev
*mddev
)
500 mutex_lock(&mddev
->reconfig_mutex
);
503 static inline int mddev_trylock(struct mddev
*mddev
)
505 return mutex_trylock(&mddev
->reconfig_mutex
);
507 extern void mddev_unlock(struct mddev
*mddev
);
509 static inline void md_sync_acct(struct block_device
*bdev
, unsigned long nr_sectors
)
511 atomic_add(nr_sectors
, &bdev
->bd_contains
->bd_disk
->sync_io
);
514 static inline void md_sync_acct_bio(struct bio
*bio
, unsigned long nr_sectors
)
516 atomic_add(nr_sectors
, &bio
->bi_disk
->sync_io
);
519 struct md_personality
523 struct list_head list
;
524 struct module
*owner
;
525 bool (*make_request
)(struct mddev
*mddev
, struct bio
*bio
);
527 * start up works that do NOT require md_thread. tasks that
528 * requires md_thread should go into start()
530 int (*run
)(struct mddev
*mddev
);
531 /* start up works that require md threads */
532 int (*start
)(struct mddev
*mddev
);
533 void (*free
)(struct mddev
*mddev
, void *priv
);
534 void (*status
)(struct seq_file
*seq
, struct mddev
*mddev
);
535 /* error_handler must set ->faulty and clear ->in_sync
536 * if appropriate, and should abort recovery if needed
538 void (*error_handler
)(struct mddev
*mddev
, struct md_rdev
*rdev
);
539 int (*hot_add_disk
) (struct mddev
*mddev
, struct md_rdev
*rdev
);
540 int (*hot_remove_disk
) (struct mddev
*mddev
, struct md_rdev
*rdev
);
541 int (*spare_active
) (struct mddev
*mddev
);
542 sector_t (*sync_request
)(struct mddev
*mddev
, sector_t sector_nr
, int *skipped
);
543 int (*resize
) (struct mddev
*mddev
, sector_t sectors
);
544 sector_t (*size
) (struct mddev
*mddev
, sector_t sectors
, int raid_disks
);
545 int (*check_reshape
) (struct mddev
*mddev
);
546 int (*start_reshape
) (struct mddev
*mddev
);
547 void (*finish_reshape
) (struct mddev
*mddev
);
548 void (*update_reshape_pos
) (struct mddev
*mddev
);
549 /* quiesce suspends or resumes internal processing.
550 * 1 - stop new actions and wait for action io to complete
551 * 0 - return to normal behaviour
553 void (*quiesce
) (struct mddev
*mddev
, int quiesce
);
554 /* takeover is used to transition an array from one
555 * personality to another. The new personality must be able
556 * to handle the data in the current layout.
557 * e.g. 2drive raid1 -> 2drive raid5
558 * ndrive raid5 -> degraded n+1drive raid6 with special layout
559 * If the takeover succeeds, a new 'private' structure is returned.
560 * This needs to be installed and then ->run used to activate the
563 void *(*takeover
) (struct mddev
*mddev
);
564 /* congested implements bdi.congested_fn().
565 * Will not be called while array is 'suspended' */
566 int (*congested
)(struct mddev
*mddev
, int bits
);
567 /* Changes the consistency policy of an active array. */
568 int (*change_consistency_policy
)(struct mddev
*mddev
, const char *buf
);
571 struct md_sysfs_entry
{
572 struct attribute attr
;
573 ssize_t (*show
)(struct mddev
*, char *);
574 ssize_t (*store
)(struct mddev
*, const char *, size_t);
576 extern struct attribute_group md_bitmap_group
;
578 static inline struct kernfs_node
*sysfs_get_dirent_safe(struct kernfs_node
*sd
, char *name
)
581 return sysfs_get_dirent(sd
, name
);
584 static inline void sysfs_notify_dirent_safe(struct kernfs_node
*sd
)
587 sysfs_notify_dirent(sd
);
590 static inline char * mdname (struct mddev
* mddev
)
592 return mddev
->gendisk
? mddev
->gendisk
->disk_name
: "mdX";
595 static inline int sysfs_link_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
598 if (!test_bit(Replacement
, &rdev
->flags
) &&
599 !test_bit(Journal
, &rdev
->flags
) &&
601 sprintf(nm
, "rd%d", rdev
->raid_disk
);
602 return sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
607 static inline void sysfs_unlink_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
610 if (!test_bit(Replacement
, &rdev
->flags
) &&
611 !test_bit(Journal
, &rdev
->flags
) &&
613 sprintf(nm
, "rd%d", rdev
->raid_disk
);
614 sysfs_remove_link(&mddev
->kobj
, nm
);
619 * iterates through some rdev ringlist. It's safe to remove the
620 * current 'rdev'. Dont touch 'tmp' though.
622 #define rdev_for_each_list(rdev, tmp, head) \
623 list_for_each_entry_safe(rdev, tmp, head, same_set)
626 * iterates through the 'same array disks' ringlist
628 #define rdev_for_each(rdev, mddev) \
629 list_for_each_entry(rdev, &((mddev)->disks), same_set)
631 #define rdev_for_each_safe(rdev, tmp, mddev) \
632 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set)
634 #define rdev_for_each_rcu(rdev, mddev) \
635 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set)
638 void (*run
) (struct md_thread
*thread
);
640 wait_queue_head_t wqueue
;
642 struct task_struct
*tsk
;
643 unsigned long timeout
;
647 #define THREAD_WAKEUP 0
649 static inline void safe_put_page(struct page
*p
)
654 extern int register_md_personality(struct md_personality
*p
);
655 extern int unregister_md_personality(struct md_personality
*p
);
656 extern int register_md_cluster_operations(struct md_cluster_operations
*ops
,
657 struct module
*module
);
658 extern int unregister_md_cluster_operations(void);
659 extern int md_setup_cluster(struct mddev
*mddev
, int nodes
);
660 extern void md_cluster_stop(struct mddev
*mddev
);
661 extern struct md_thread
*md_register_thread(
662 void (*run
)(struct md_thread
*thread
),
665 extern void md_unregister_thread(struct md_thread
**threadp
);
666 extern void md_wakeup_thread(struct md_thread
*thread
);
667 extern void md_check_recovery(struct mddev
*mddev
);
668 extern void md_reap_sync_thread(struct mddev
*mddev
);
669 extern int mddev_init_writes_pending(struct mddev
*mddev
);
670 extern bool md_write_start(struct mddev
*mddev
, struct bio
*bi
);
671 extern void md_write_inc(struct mddev
*mddev
, struct bio
*bi
);
672 extern void md_write_end(struct mddev
*mddev
);
673 extern void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
);
674 extern void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
);
675 extern void md_finish_reshape(struct mddev
*mddev
);
677 extern int mddev_congested(struct mddev
*mddev
, int bits
);
678 extern void md_flush_request(struct mddev
*mddev
, struct bio
*bio
);
679 extern void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
680 sector_t sector
, int size
, struct page
*page
);
681 extern int md_super_wait(struct mddev
*mddev
);
682 extern int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
683 struct page
*page
, int op
, int op_flags
,
685 extern void md_do_sync(struct md_thread
*thread
);
686 extern void md_new_event(struct mddev
*mddev
);
687 extern void md_allow_write(struct mddev
*mddev
);
688 extern void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
);
689 extern void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
);
690 extern int md_check_no_bitmap(struct mddev
*mddev
);
691 extern int md_integrity_register(struct mddev
*mddev
);
692 extern int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
);
693 extern int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
);
695 extern void mddev_init(struct mddev
*mddev
);
696 extern int md_run(struct mddev
*mddev
);
697 extern int md_start(struct mddev
*mddev
);
698 extern void md_stop(struct mddev
*mddev
);
699 extern void md_stop_writes(struct mddev
*mddev
);
700 extern int md_rdev_init(struct md_rdev
*rdev
);
701 extern void md_rdev_clear(struct md_rdev
*rdev
);
703 extern void md_handle_request(struct mddev
*mddev
, struct bio
*bio
);
704 extern void mddev_suspend(struct mddev
*mddev
);
705 extern void mddev_resume(struct mddev
*mddev
);
706 extern struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
707 struct mddev
*mddev
);
709 extern void md_reload_sb(struct mddev
*mddev
, int raid_disk
);
710 extern void md_update_sb(struct mddev
*mddev
, int force
);
711 extern void md_kick_rdev_from_array(struct md_rdev
* rdev
);
712 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
);
713 struct md_rdev
*md_find_rdev_rcu(struct mddev
*mddev
, dev_t dev
);
715 static inline void rdev_dec_pending(struct md_rdev
*rdev
, struct mddev
*mddev
)
717 int faulty
= test_bit(Faulty
, &rdev
->flags
);
718 if (atomic_dec_and_test(&rdev
->nr_pending
) && faulty
) {
719 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
720 md_wakeup_thread(mddev
->thread
);
724 extern struct md_cluster_operations
*md_cluster_ops
;
725 static inline int mddev_is_clustered(struct mddev
*mddev
)
727 return mddev
->cluster_info
&& mddev
->bitmap_info
.nodes
> 1;
730 /* clear unsupported mddev_flags */
731 static inline void mddev_clear_unsupported_flags(struct mddev
*mddev
,
732 unsigned long unsupported_flags
)
734 mddev
->flags
&= ~unsupported_flags
;
737 static inline void mddev_check_writesame(struct mddev
*mddev
, struct bio
*bio
)
739 if (bio_op(bio
) == REQ_OP_WRITE_SAME
&&
740 !bio
->bi_disk
->queue
->limits
.max_write_same_sectors
)
741 mddev
->queue
->limits
.max_write_same_sectors
= 0;
744 static inline void mddev_check_write_zeroes(struct mddev
*mddev
, struct bio
*bio
)
746 if (bio_op(bio
) == REQ_OP_WRITE_ZEROES
&&
747 !bio
->bi_disk
->queue
->limits
.max_write_zeroes_sectors
)
748 mddev
->queue
->limits
.max_write_zeroes_sectors
= 0;
750 #endif /* _MD_MD_H */