2 md.h : kernel internal structure of the Linux MD driver
3 Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
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)
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.
18 #include <linux/blkdev.h>
19 #include <linux/backing-dev.h>
20 #include <linux/badblocks.h>
21 #include <linux/kobject.h>
22 #include <linux/list.h>
24 #include <linux/mutex.h>
25 #include <linux/timer.h>
26 #include <linux/wait.h>
27 #include <linux/workqueue.h>
28 #include "md-cluster.h"
30 #define MaxSector (~(sector_t)0)
33 * These flags should really be called "NO_RETRY" rather than
34 * "FAILFAST" because they don't make any promise about time lapse,
35 * only about the number of retries, which will be zero.
36 * REQ_FAILFAST_DRIVER is not included because
37 * Commit: 4a27446f3e39 ("[SCSI] modify scsi to handle new fail fast flags.")
38 * seems to suggest that the errors it avoids retrying should usually
41 #define MD_FAILFAST (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT)
43 * MD's 'extended' device
46 struct list_head same_set
; /* RAID devices within the same set */
48 sector_t sectors
; /* Device size (in 512bytes sectors) */
49 struct mddev
*mddev
; /* RAID array if running */
50 int last_events
; /* IO event timestamp */
53 * If meta_bdev is non-NULL, it means that a separate device is
54 * being used to store the metadata (superblock/bitmap) which
55 * would otherwise be contained on the same device as the data (bdev).
57 struct block_device
*meta_bdev
;
58 struct block_device
*bdev
; /* block device handle */
60 struct page
*sb_page
, *bb_page
;
63 sector_t data_offset
; /* start of data in array */
64 sector_t new_data_offset
;/* only relevant while reshaping */
65 sector_t sb_start
; /* offset of the super block (in 512byte sectors) */
66 int sb_size
; /* bytes in the superblock */
67 int preferred_minor
; /* autorun support */
71 /* A device can be in one of three states based on two flags:
72 * Not working: faulty==1 in_sync==0
73 * Fully working: faulty==0 in_sync==1
76 * faulty==0 in_sync==0
78 * It can never have faulty==1, in_sync==1
79 * This reduces the burden of testing multiple flags in many cases
82 unsigned long flags
; /* bit set of 'enum flag_bits' bits. */
83 wait_queue_head_t blocked_wait
;
85 int desc_nr
; /* descriptor index in the superblock */
86 int raid_disk
; /* role of device in array */
87 int new_raid_disk
; /* role that the device will have in
88 * the array after a level-change completes.
90 int saved_raid_disk
; /* role that device used to have in the
91 * array and could again if we did a partial
92 * resync from the bitmap
95 sector_t recovery_offset
;/* If this device has been partially
96 * recovered, this is where we were
99 sector_t journal_tail
; /* If this device is a journal device,
100 * this is the journal tail (journal
101 * recovery start point)
105 atomic_t nr_pending
; /* number of pending requests.
106 * only maintained for arrays that
107 * support hot removal
109 atomic_t read_errors
; /* number of consecutive read errors that
110 * we have tried to ignore.
112 time64_t last_read_error
; /* monotonic time since our
115 atomic_t corrected_errors
; /* number of corrected read errors,
116 * for reporting to userspace and storing
119 struct work_struct del_work
; /* used for delayed sysfs removal */
121 struct kernfs_node
*sysfs_state
; /* handle for 'state'
124 struct badblocks badblocks
;
127 short offset
; /* Offset from superblock to start of PPL.
128 * Not used by external metadata. */
129 unsigned int size
; /* Size in sectors of the PPL space */
130 sector_t sector
; /* First sector of the PPL space */
134 Faulty
, /* device is known to have a fault */
135 In_sync
, /* device is in_sync with rest of array */
136 Bitmap_sync
, /* ..actually, not quite In_sync. Need a
137 * bitmap-based recovery to get fully in sync
139 WriteMostly
, /* Avoid reading if at all possible */
140 AutoDetected
, /* added by auto-detect */
141 Blocked
, /* An error occurred but has not yet
142 * been acknowledged by the metadata
143 * handler, so don't allow writes
144 * until it is cleared */
145 WriteErrorSeen
, /* A write error has been seen on this
148 FaultRecorded
, /* Intermediate state for clearing
149 * Blocked. The Fault is/will-be
150 * recorded in the metadata, but that
151 * metadata hasn't been stored safely
154 BlockedBadBlocks
, /* A writer is blocked because they
155 * found an unacknowledged bad-block.
156 * This can safely be cleared at any
157 * time, and the writer will re-check.
158 * It may be set at any time, and at
159 * worst the writer will timeout and
160 * re-check. So setting it as
161 * accurately as possible is good, but
162 * not absolutely critical.
164 WantReplacement
, /* This device is a candidate to be
165 * hot-replaced, either because it has
166 * reported some faults, or because
167 * of explicit request.
169 Replacement
, /* This device is a replacement for
170 * a want_replacement device with same
173 Candidate
, /* For clustered environments only:
174 * This device is seen locally but not
175 * by the whole cluster
177 Journal
, /* This device is used as journal for
179 * Usually, this device should be faster
180 * than other devices in the array
183 RemoveSynchronized
, /* synchronize_rcu() was called after
184 * this device was known to be faulty,
185 * so it is safe to remove without
186 * another synchronize_rcu() call.
188 ExternalBbl
, /* External metadata provides bad
189 * block management for a disk
191 FailFast
, /* Minimal retries should be attempted on
192 * this device, so use REQ_FAILFAST_DEV.
193 * Also don't try to repair failed reads.
194 * It is expects that no bad block log
197 LastDev
, /* Seems to be the last working dev as
198 * it didn't fail, so don't use FailFast
199 * any more for metadata
203 static inline int is_badblock(struct md_rdev
*rdev
, sector_t s
, int sectors
,
204 sector_t
*first_bad
, int *bad_sectors
)
206 if (unlikely(rdev
->badblocks
.count
)) {
207 int rv
= badblocks_check(&rdev
->badblocks
, rdev
->data_offset
+ s
,
209 first_bad
, bad_sectors
);
211 *first_bad
-= rdev
->data_offset
;
216 extern int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
218 extern int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
220 struct md_cluster_info
;
222 /* change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added */
224 MD_ARRAY_FIRST_USE
, /* First use of array, needs initialization */
225 MD_CLOSING
, /* If set, we are closing the array, do not open
227 MD_JOURNAL_CLEAN
, /* A raid with journal is already clean */
228 MD_HAS_JOURNAL
, /* The raid array has journal feature set */
229 MD_CLUSTER_RESYNC_LOCKED
, /* cluster raid only, which means node
230 * already took resync lock, need to
231 * release the lock */
232 MD_FAILFAST_SUPPORTED
, /* Using MD_FAILFAST on metadata writes is
233 * supported as calls to md_error() will
234 * never cause the array to become failed.
236 MD_HAS_PPL
, /* The raid array has PPL feature set */
239 enum mddev_sb_flags
{
240 MD_SB_CHANGE_DEVS
, /* Some device status has changed */
241 MD_SB_CHANGE_CLEAN
, /* transition to or from 'clean' */
242 MD_SB_CHANGE_PENDING
, /* switch from 'clean' to 'active' in progress */
243 MD_SB_NEED_REWRITE
, /* metadata write needs to be repeated */
248 struct md_personality
*pers
;
251 struct list_head disks
;
253 unsigned long sb_flags
;
258 int sysfs_active
; /* set when sysfs deletes
259 * are happening, so run/
260 * takeover/stop are not safe
262 struct gendisk
*gendisk
;
266 #define UNTIL_IOCTL 1
269 /* Superblock information */
274 int external
; /* metadata is
275 * managed externally */
276 char metadata_type
[17]; /* externally set*/
278 time64_t ctime
, utime
;
283 sector_t dev_sectors
; /* used size of
284 * component devices */
285 sector_t array_sectors
; /* exported array size */
286 int external_size
; /* size managed
289 /* If the last 'event' was simply a clean->dirty transition, and
290 * we didn't write it to the spares, then it is safe and simple
291 * to just decrement the event count on a dirty->clean transition.
292 * So we record that possibility here.
294 int can_decrease_events
;
298 /* If the array is being reshaped, we need to record the
299 * new shape and an indication of where we are up to.
300 * This is written to the superblock.
301 * If reshape_position is MaxSector, then no reshape is happening (yet).
303 sector_t reshape_position
;
304 int delta_disks
, new_level
, new_layout
;
305 int new_chunk_sectors
;
306 int reshape_backwards
;
308 struct md_thread
*thread
; /* management thread */
309 struct md_thread
*sync_thread
; /* doing resync or reconstruct */
311 /* 'last_sync_action' is initialized to "none". It is set when a
312 * sync operation (i.e "data-check", "requested-resync", "resync",
313 * "recovery", or "reshape") is started. It holds this value even
314 * when the sync thread is "frozen" (interrupted) or "idle" (stopped
315 * or finished). It is overwritten when a new sync operation is begun.
317 char *last_sync_action
;
318 sector_t curr_resync
; /* last block scheduled */
319 /* As resync requests can complete out of order, we cannot easily track
320 * how much resync has been completed. So we occasionally pause until
321 * everything completes, then set curr_resync_completed to curr_resync.
322 * As such it may be well behind the real resync mark, but it is a value
325 sector_t curr_resync_completed
;
326 unsigned long resync_mark
; /* a recent timestamp */
327 sector_t resync_mark_cnt
;/* blocks written at resync_mark */
328 sector_t curr_mark_cnt
; /* blocks scheduled now */
330 sector_t resync_max_sectors
; /* may be set by personality */
332 atomic64_t resync_mismatches
; /* count of sectors where
333 * parity/replica mismatch found
336 /* allow user-space to request suspension of IO to regions of the array */
339 /* if zero, use the system-wide default */
343 /* resync even though the same disks are shared among md-devices */
346 int ok_start_degraded
;
348 unsigned long recovery
;
349 /* If a RAID personality determines that recovery (of a particular
350 * device) will fail due to a read error on the source device, it
351 * takes a copy of this number and does not attempt recovery again
352 * until this number changes.
354 int recovery_disabled
;
356 int in_sync
; /* know to not need resync */
357 /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so
358 * that we are never stopping an array while it is open.
359 * 'reconfig_mutex' protects all other reconfiguration.
360 * These locks are separate due to conflicting interactions
361 * with bdev->bd_mutex.
363 * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk
364 * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open
366 struct mutex open_mutex
;
367 struct mutex reconfig_mutex
;
368 atomic_t active
; /* general refcount */
369 atomic_t openers
; /* number of active opens */
371 int changed
; /* True if we might need to
372 * reread partition info */
373 int degraded
; /* whether md should consider
377 atomic_t recovery_active
; /* blocks scheduled, but not written */
378 wait_queue_head_t recovery_wait
;
379 sector_t recovery_cp
;
380 sector_t resync_min
; /* user requested sync
382 sector_t resync_max
; /* resync should pause
383 * when it gets here */
385 struct kernfs_node
*sysfs_state
; /* handle for 'array_state'
388 struct kernfs_node
*sysfs_action
; /* handle for 'sync_action' */
390 struct work_struct del_work
; /* used for delayed sysfs removal */
393 * flush_bio transition from NULL to !NULL
394 * rdev superblocks, events
395 * clearing MD_CHANGE_*
396 * in_sync - and related safemode and MD_CHANGE changes
397 * pers (also protected by reconfig_mutex and pending IO).
399 * clearing ->bitmap_info.file
400 * changing ->resync_{min,max}
401 * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max})
404 wait_queue_head_t sb_wait
; /* for waiting on superblock updates */
405 atomic_t pending_writes
; /* number of active superblock writes */
407 unsigned int safemode
; /* if set, update "clean" superblock
408 * when no writes pending.
410 unsigned int safemode_delay
;
411 struct timer_list safemode_timer
;
412 struct percpu_ref writes_pending
;
413 int sync_checkers
; /* # of threads checking writes_pending */
414 struct request_queue
*queue
; /* for plugging ... */
416 struct bitmap
*bitmap
; /* the bitmap for the device */
418 struct file
*file
; /* the bitmap file */
419 loff_t offset
; /* offset from superblock of
420 * start of bitmap. May be
421 * negative, but not '0'
422 * For external metadata, offset
423 * from start of device.
425 unsigned long space
; /* space available at this offset */
426 loff_t default_offset
; /* this is the offset to use when
427 * hot-adding a bitmap. It should
428 * eventually be settable by sysfs.
430 unsigned long default_space
; /* space available at
433 unsigned long chunksize
;
434 unsigned long daemon_sleep
; /* how many jiffies between updates? */
435 unsigned long max_write_behind
; /* write-behind mode */
437 int nodes
; /* Maximum number of nodes in the cluster */
438 char cluster_name
[64]; /* Name of the cluster */
441 atomic_t max_corr_read_errors
; /* max read retries */
442 struct list_head all_mddevs
;
444 struct attribute_group
*to_remove
;
446 struct bio_set
*bio_set
;
448 /* Generic flush handling.
449 * The last to finish preflush schedules a worker to submit
450 * the rest of the request (without the REQ_PREFLUSH flag).
452 struct bio
*flush_bio
;
453 atomic_t flush_pending
;
454 struct work_struct flush_work
;
455 struct work_struct event_work
; /* used by dm to report failure event */
456 void (*sync_super
)(struct mddev
*mddev
, struct md_rdev
*rdev
);
457 struct md_cluster_info
*cluster_info
;
458 unsigned int good_device_nr
; /* good device num within cluster raid */
461 enum recovery_flags
{
463 * If neither SYNC or RESHAPE are set, then it is a recovery.
465 MD_RECOVERY_RUNNING
, /* a thread is running, or about to be started */
466 MD_RECOVERY_SYNC
, /* actually doing a resync, not a recovery */
467 MD_RECOVERY_RECOVER
, /* doing recovery, or need to try it. */
468 MD_RECOVERY_INTR
, /* resync needs to be aborted for some reason */
469 MD_RECOVERY_DONE
, /* thread is done and is waiting to be reaped */
470 MD_RECOVERY_NEEDED
, /* we might need to start a resync/recover */
471 MD_RECOVERY_REQUESTED
, /* user-space has requested a sync (used with SYNC) */
472 MD_RECOVERY_CHECK
, /* user-space request for check-only, no repair */
473 MD_RECOVERY_RESHAPE
, /* A reshape is happening */
474 MD_RECOVERY_FROZEN
, /* User request to abort, and not restart, any action */
475 MD_RECOVERY_ERROR
, /* sync-action interrupted because io-error */
478 static inline int __must_check
mddev_lock(struct mddev
*mddev
)
480 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
483 /* Sometimes we need to take the lock in a situation where
484 * failure due to interrupts is not acceptable.
486 static inline void mddev_lock_nointr(struct mddev
*mddev
)
488 mutex_lock(&mddev
->reconfig_mutex
);
491 static inline int mddev_is_locked(struct mddev
*mddev
)
493 return mutex_is_locked(&mddev
->reconfig_mutex
);
496 static inline int mddev_trylock(struct mddev
*mddev
)
498 return mutex_trylock(&mddev
->reconfig_mutex
);
500 extern void mddev_unlock(struct mddev
*mddev
);
502 static inline void md_sync_acct(struct block_device
*bdev
, unsigned long nr_sectors
)
504 atomic_add(nr_sectors
, &bdev
->bd_contains
->bd_disk
->sync_io
);
507 struct md_personality
511 struct list_head list
;
512 struct module
*owner
;
513 void (*make_request
)(struct mddev
*mddev
, struct bio
*bio
);
514 int (*run
)(struct mddev
*mddev
);
515 void (*free
)(struct mddev
*mddev
, void *priv
);
516 void (*status
)(struct seq_file
*seq
, struct mddev
*mddev
);
517 /* error_handler must set ->faulty and clear ->in_sync
518 * if appropriate, and should abort recovery if needed
520 void (*error_handler
)(struct mddev
*mddev
, struct md_rdev
*rdev
);
521 int (*hot_add_disk
) (struct mddev
*mddev
, struct md_rdev
*rdev
);
522 int (*hot_remove_disk
) (struct mddev
*mddev
, struct md_rdev
*rdev
);
523 int (*spare_active
) (struct mddev
*mddev
);
524 sector_t (*sync_request
)(struct mddev
*mddev
, sector_t sector_nr
, int *skipped
);
525 int (*resize
) (struct mddev
*mddev
, sector_t sectors
);
526 sector_t (*size
) (struct mddev
*mddev
, sector_t sectors
, int raid_disks
);
527 int (*check_reshape
) (struct mddev
*mddev
);
528 int (*start_reshape
) (struct mddev
*mddev
);
529 void (*finish_reshape
) (struct mddev
*mddev
);
530 /* quiesce moves between quiescence states
532 * 1 - no new requests allowed
535 void (*quiesce
) (struct mddev
*mddev
, int state
);
536 /* takeover is used to transition an array from one
537 * personality to another. The new personality must be able
538 * to handle the data in the current layout.
539 * e.g. 2drive raid1 -> 2drive raid5
540 * ndrive raid5 -> degraded n+1drive raid6 with special layout
541 * If the takeover succeeds, a new 'private' structure is returned.
542 * This needs to be installed and then ->run used to activate the
545 void *(*takeover
) (struct mddev
*mddev
);
546 /* congested implements bdi.congested_fn().
547 * Will not be called while array is 'suspended' */
548 int (*congested
)(struct mddev
*mddev
, int bits
);
549 /* Changes the consistency policy of an active array. */
550 int (*change_consistency_policy
)(struct mddev
*mddev
, const char *buf
);
553 struct md_sysfs_entry
{
554 struct attribute attr
;
555 ssize_t (*show
)(struct mddev
*, char *);
556 ssize_t (*store
)(struct mddev
*, const char *, size_t);
558 extern struct attribute_group md_bitmap_group
;
560 static inline struct kernfs_node
*sysfs_get_dirent_safe(struct kernfs_node
*sd
, char *name
)
563 return sysfs_get_dirent(sd
, name
);
566 static inline void sysfs_notify_dirent_safe(struct kernfs_node
*sd
)
569 sysfs_notify_dirent(sd
);
572 static inline char * mdname (struct mddev
* mddev
)
574 return mddev
->gendisk
? mddev
->gendisk
->disk_name
: "mdX";
577 static inline int sysfs_link_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
580 if (!test_bit(Replacement
, &rdev
->flags
) &&
581 !test_bit(Journal
, &rdev
->flags
) &&
583 sprintf(nm
, "rd%d", rdev
->raid_disk
);
584 return sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
589 static inline void sysfs_unlink_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
592 if (!test_bit(Replacement
, &rdev
->flags
) &&
593 !test_bit(Journal
, &rdev
->flags
) &&
595 sprintf(nm
, "rd%d", rdev
->raid_disk
);
596 sysfs_remove_link(&mddev
->kobj
, nm
);
601 * iterates through some rdev ringlist. It's safe to remove the
602 * current 'rdev'. Dont touch 'tmp' though.
604 #define rdev_for_each_list(rdev, tmp, head) \
605 list_for_each_entry_safe(rdev, tmp, head, same_set)
608 * iterates through the 'same array disks' ringlist
610 #define rdev_for_each(rdev, mddev) \
611 list_for_each_entry(rdev, &((mddev)->disks), same_set)
613 #define rdev_for_each_safe(rdev, tmp, mddev) \
614 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set)
616 #define rdev_for_each_rcu(rdev, mddev) \
617 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set)
620 void (*run
) (struct md_thread
*thread
);
622 wait_queue_head_t wqueue
;
624 struct task_struct
*tsk
;
625 unsigned long timeout
;
629 #define THREAD_WAKEUP 0
631 static inline void safe_put_page(struct page
*p
)
636 extern int register_md_personality(struct md_personality
*p
);
637 extern int unregister_md_personality(struct md_personality
*p
);
638 extern int register_md_cluster_operations(struct md_cluster_operations
*ops
,
639 struct module
*module
);
640 extern int unregister_md_cluster_operations(void);
641 extern int md_setup_cluster(struct mddev
*mddev
, int nodes
);
642 extern void md_cluster_stop(struct mddev
*mddev
);
643 extern struct md_thread
*md_register_thread(
644 void (*run
)(struct md_thread
*thread
),
647 extern void md_unregister_thread(struct md_thread
**threadp
);
648 extern void md_wakeup_thread(struct md_thread
*thread
);
649 extern void md_check_recovery(struct mddev
*mddev
);
650 extern void md_reap_sync_thread(struct mddev
*mddev
);
651 extern int mddev_init_writes_pending(struct mddev
*mddev
);
652 extern void md_write_start(struct mddev
*mddev
, struct bio
*bi
);
653 extern void md_write_inc(struct mddev
*mddev
, struct bio
*bi
);
654 extern void md_write_end(struct mddev
*mddev
);
655 extern void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
);
656 extern void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
);
657 extern void md_finish_reshape(struct mddev
*mddev
);
659 extern int mddev_congested(struct mddev
*mddev
, int bits
);
660 extern void md_flush_request(struct mddev
*mddev
, struct bio
*bio
);
661 extern void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
662 sector_t sector
, int size
, struct page
*page
);
663 extern int md_super_wait(struct mddev
*mddev
);
664 extern int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
665 struct page
*page
, int op
, int op_flags
,
667 extern void md_do_sync(struct md_thread
*thread
);
668 extern void md_new_event(struct mddev
*mddev
);
669 extern void md_allow_write(struct mddev
*mddev
);
670 extern void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
);
671 extern void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
);
672 extern int md_check_no_bitmap(struct mddev
*mddev
);
673 extern int md_integrity_register(struct mddev
*mddev
);
674 extern int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
);
675 extern int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
);
677 extern void mddev_init(struct mddev
*mddev
);
678 extern int md_run(struct mddev
*mddev
);
679 extern void md_stop(struct mddev
*mddev
);
680 extern void md_stop_writes(struct mddev
*mddev
);
681 extern int md_rdev_init(struct md_rdev
*rdev
);
682 extern void md_rdev_clear(struct md_rdev
*rdev
);
684 extern void mddev_suspend(struct mddev
*mddev
);
685 extern void mddev_resume(struct mddev
*mddev
);
686 extern struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
687 struct mddev
*mddev
);
689 extern void md_reload_sb(struct mddev
*mddev
, int raid_disk
);
690 extern void md_update_sb(struct mddev
*mddev
, int force
);
691 extern void md_kick_rdev_from_array(struct md_rdev
* rdev
);
692 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
);
694 static inline void rdev_dec_pending(struct md_rdev
*rdev
, struct mddev
*mddev
)
696 int faulty
= test_bit(Faulty
, &rdev
->flags
);
697 if (atomic_dec_and_test(&rdev
->nr_pending
) && faulty
) {
698 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
699 md_wakeup_thread(mddev
->thread
);
703 extern struct md_cluster_operations
*md_cluster_ops
;
704 static inline int mddev_is_clustered(struct mddev
*mddev
)
706 return mddev
->cluster_info
&& mddev
->bitmap_info
.nodes
> 1;
709 /* clear unsupported mddev_flags */
710 static inline void mddev_clear_unsupported_flags(struct mddev
*mddev
,
711 unsigned long unsupported_flags
)
713 mddev
->flags
&= ~unsupported_flags
;
716 static inline void mddev_check_writesame(struct mddev
*mddev
, struct bio
*bio
)
718 if (bio_op(bio
) == REQ_OP_WRITE_SAME
&&
719 !bdev_get_queue(bio
->bi_bdev
)->limits
.max_write_same_sectors
)
720 mddev
->queue
->limits
.max_write_same_sectors
= 0;
723 static inline void mddev_check_write_zeroes(struct mddev
*mddev
, struct bio
*bio
)
725 if (bio_op(bio
) == REQ_OP_WRITE_ZEROES
&&
726 !bdev_get_queue(bio
->bi_bdev
)->limits
.max_write_zeroes_sectors
)
727 mddev
->queue
->limits
.max_write_zeroes_sectors
= 0;
730 /* Maximum size of each resync request */
731 #define RESYNC_BLOCK_SIZE (64*1024)
732 #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
734 /* for managing resync I/O pages */
735 struct resync_pages
{
736 unsigned idx
; /* for get/put page from the pool */
738 struct page
*pages
[RESYNC_PAGES
];
741 static inline int resync_alloc_pages(struct resync_pages
*rp
,
746 for (i
= 0; i
< RESYNC_PAGES
; i
++) {
747 rp
->pages
[i
] = alloc_page(gfp_flags
);
756 put_page(rp
->pages
[i
]);
760 static inline void resync_free_pages(struct resync_pages
*rp
)
764 for (i
= 0; i
< RESYNC_PAGES
; i
++)
765 put_page(rp
->pages
[i
]);
768 static inline void resync_get_all_pages(struct resync_pages
*rp
)
772 for (i
= 0; i
< RESYNC_PAGES
; i
++)
773 get_page(rp
->pages
[i
]);
776 static inline struct page
*resync_fetch_page(struct resync_pages
*rp
,
779 if (WARN_ON_ONCE(idx
>= RESYNC_PAGES
))
781 return rp
->pages
[idx
];
783 #endif /* _MD_MD_H */