1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* |
3 | md.h : kernel internal structure of the Linux MD driver |
4 | Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman |
5 | |
6 | */ |
7 | |
8 | #ifndef _MD_MD_H |
9 | #define _MD_MD_H |
10 | |
11 | #include <linux/blkdev.h> |
12 | #include <linux/backing-dev.h> |
13 | #include <linux/badblocks.h> |
14 | #include <linux/kobject.h> |
15 | #include <linux/list.h> |
16 | #include <linux/mm.h> |
17 | #include <linux/mutex.h> |
18 | #include <linux/timer.h> |
19 | #include <linux/wait.h> |
20 | #include <linux/workqueue.h> |
21 | #include <trace/events/block.h> |
22 | #include "md-cluster.h" |
23 | |
24 | #define MaxSector (~(sector_t)0) |
25 | |
26 | /* |
27 | * These flags should really be called "NO_RETRY" rather than |
28 | * "FAILFAST" because they don't make any promise about time lapse, |
29 | * only about the number of retries, which will be zero. |
30 | * REQ_FAILFAST_DRIVER is not included because |
31 | * Commit: 4a27446f3e39 ("[SCSI] modify scsi to handle new fail fast flags.") |
32 | * seems to suggest that the errors it avoids retrying should usually |
33 | * be retried. |
34 | */ |
35 | #define MD_FAILFAST (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT) |
36 | |
37 | /* |
38 | * The struct embedded in rdev is used to serialize IO. |
39 | */ |
40 | struct serial_in_rdev { |
41 | struct rb_root_cached serial_rb; |
42 | spinlock_t serial_lock; |
43 | wait_queue_head_t serial_io_wait; |
44 | }; |
45 | |
46 | /* |
47 | * MD's 'extended' device |
48 | */ |
49 | struct md_rdev { |
50 | struct list_head same_set; /* RAID devices within the same set */ |
51 | |
52 | sector_t sectors; /* Device size (in 512bytes sectors) */ |
53 | struct mddev *mddev; /* RAID array if running */ |
54 | int last_events; /* IO event timestamp */ |
55 | |
56 | /* |
57 | * If meta_bdev is non-NULL, it means that a separate device is |
58 | * being used to store the metadata (superblock/bitmap) which |
59 | * would otherwise be contained on the same device as the data (bdev). |
60 | */ |
61 | struct block_device *meta_bdev; |
62 | struct block_device *bdev; /* block device handle */ |
63 | struct file *bdev_file; /* Handle from open for bdev */ |
64 | |
65 | struct page *sb_page, *bb_page; |
66 | int sb_loaded; |
67 | __u64 sb_events; |
68 | sector_t data_offset; /* start of data in array */ |
69 | sector_t new_data_offset;/* only relevant while reshaping */ |
70 | sector_t sb_start; /* offset of the super block (in 512byte sectors) */ |
71 | int sb_size; /* bytes in the superblock */ |
72 | int preferred_minor; /* autorun support */ |
73 | |
74 | struct kobject kobj; |
75 | |
76 | /* A device can be in one of three states based on two flags: |
77 | * Not working: faulty==1 in_sync==0 |
78 | * Fully working: faulty==0 in_sync==1 |
79 | * Working, but not |
80 | * in sync with array |
81 | * faulty==0 in_sync==0 |
82 | * |
83 | * It can never have faulty==1, in_sync==1 |
84 | * This reduces the burden of testing multiple flags in many cases |
85 | */ |
86 | |
87 | unsigned long flags; /* bit set of 'enum flag_bits' bits. */ |
88 | wait_queue_head_t blocked_wait; |
89 | |
90 | int desc_nr; /* descriptor index in the superblock */ |
91 | int raid_disk; /* role of device in array */ |
92 | int new_raid_disk; /* role that the device will have in |
93 | * the array after a level-change completes. |
94 | */ |
95 | int saved_raid_disk; /* role that device used to have in the |
96 | * array and could again if we did a partial |
97 | * resync from the bitmap |
98 | */ |
99 | union { |
100 | sector_t recovery_offset;/* If this device has been partially |
101 | * recovered, this is where we were |
102 | * up to. |
103 | */ |
104 | sector_t journal_tail; /* If this device is a journal device, |
105 | * this is the journal tail (journal |
106 | * recovery start point) |
107 | */ |
108 | }; |
109 | |
110 | atomic_t nr_pending; /* number of pending requests. |
111 | * only maintained for arrays that |
112 | * support hot removal |
113 | */ |
114 | atomic_t read_errors; /* number of consecutive read errors that |
115 | * we have tried to ignore. |
116 | */ |
117 | time64_t last_read_error; /* monotonic time since our |
118 | * last read error |
119 | */ |
120 | atomic_t corrected_errors; /* number of corrected read errors, |
121 | * for reporting to userspace and storing |
122 | * in superblock. |
123 | */ |
124 | |
125 | struct serial_in_rdev *serial; /* used for raid1 io serialization */ |
126 | |
127 | struct kernfs_node *sysfs_state; /* handle for 'state' |
128 | * sysfs entry */ |
129 | /* handle for 'unacknowledged_bad_blocks' sysfs dentry */ |
130 | struct kernfs_node *sysfs_unack_badblocks; |
131 | /* handle for 'bad_blocks' sysfs dentry */ |
132 | struct kernfs_node *sysfs_badblocks; |
133 | struct badblocks badblocks; |
134 | |
135 | struct { |
136 | short offset; /* Offset from superblock to start of PPL. |
137 | * Not used by external metadata. */ |
138 | unsigned int size; /* Size in sectors of the PPL space */ |
139 | sector_t sector; /* First sector of the PPL space */ |
140 | } ppl; |
141 | }; |
142 | enum flag_bits { |
143 | Faulty, /* device is known to have a fault */ |
144 | In_sync, /* device is in_sync with rest of array */ |
145 | Bitmap_sync, /* ..actually, not quite In_sync. Need a |
146 | * bitmap-based recovery to get fully in sync. |
147 | * The bit is only meaningful before device |
148 | * has been passed to pers->hot_add_disk. |
149 | */ |
150 | WriteMostly, /* Avoid reading if at all possible */ |
151 | AutoDetected, /* added by auto-detect */ |
152 | Blocked, /* An error occurred but has not yet |
153 | * been acknowledged by the metadata |
154 | * handler, so don't allow writes |
155 | * until it is cleared */ |
156 | WriteErrorSeen, /* A write error has been seen on this |
157 | * device |
158 | */ |
159 | FaultRecorded, /* Intermediate state for clearing |
160 | * Blocked. The Fault is/will-be |
161 | * recorded in the metadata, but that |
162 | * metadata hasn't been stored safely |
163 | * on disk yet. |
164 | */ |
165 | BlockedBadBlocks, /* A writer is blocked because they |
166 | * found an unacknowledged bad-block. |
167 | * This can safely be cleared at any |
168 | * time, and the writer will re-check. |
169 | * It may be set at any time, and at |
170 | * worst the writer will timeout and |
171 | * re-check. So setting it as |
172 | * accurately as possible is good, but |
173 | * not absolutely critical. |
174 | */ |
175 | WantReplacement, /* This device is a candidate to be |
176 | * hot-replaced, either because it has |
177 | * reported some faults, or because |
178 | * of explicit request. |
179 | */ |
180 | Replacement, /* This device is a replacement for |
181 | * a want_replacement device with same |
182 | * raid_disk number. |
183 | */ |
184 | Candidate, /* For clustered environments only: |
185 | * This device is seen locally but not |
186 | * by the whole cluster |
187 | */ |
188 | Journal, /* This device is used as journal for |
189 | * raid-5/6. |
190 | * Usually, this device should be faster |
191 | * than other devices in the array |
192 | */ |
193 | ClusterRemove, |
194 | ExternalBbl, /* External metadata provides bad |
195 | * block management for a disk |
196 | */ |
197 | FailFast, /* Minimal retries should be attempted on |
198 | * this device, so use REQ_FAILFAST_DEV. |
199 | * Also don't try to repair failed reads. |
200 | * It is expects that no bad block log |
201 | * is present. |
202 | */ |
203 | LastDev, /* Seems to be the last working dev as |
204 | * it didn't fail, so don't use FailFast |
205 | * any more for metadata |
206 | */ |
207 | CollisionCheck, /* |
208 | * check if there is collision between raid1 |
209 | * serial bios. |
210 | */ |
211 | Nonrot, /* non-rotational device (SSD) */ |
212 | }; |
213 | |
214 | static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, |
215 | sector_t *first_bad, int *bad_sectors) |
216 | { |
217 | if (unlikely(rdev->badblocks.count)) { |
218 | int rv = badblocks_check(bb: &rdev->badblocks, s: rdev->data_offset + s, |
219 | sectors, |
220 | first_bad, bad_sectors); |
221 | if (rv) |
222 | *first_bad -= rdev->data_offset; |
223 | return rv; |
224 | } |
225 | return 0; |
226 | } |
227 | |
228 | static inline int rdev_has_badblock(struct md_rdev *rdev, sector_t s, |
229 | int sectors) |
230 | { |
231 | sector_t first_bad; |
232 | int bad_sectors; |
233 | |
234 | return is_badblock(rdev, s, sectors, first_bad: &first_bad, bad_sectors: &bad_sectors); |
235 | } |
236 | |
237 | extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
238 | int is_new); |
239 | extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
240 | int is_new); |
241 | struct md_cluster_info; |
242 | |
243 | /** |
244 | * enum mddev_flags - md device flags. |
245 | * @MD_ARRAY_FIRST_USE: First use of array, needs initialization. |
246 | * @MD_CLOSING: If set, we are closing the array, do not open it then. |
247 | * @MD_JOURNAL_CLEAN: A raid with journal is already clean. |
248 | * @MD_HAS_JOURNAL: The raid array has journal feature set. |
249 | * @MD_CLUSTER_RESYNC_LOCKED: cluster raid only, which means node, already took |
250 | * resync lock, need to release the lock. |
251 | * @MD_FAILFAST_SUPPORTED: Using MD_FAILFAST on metadata writes is supported as |
252 | * calls to md_error() will never cause the array to |
253 | * become failed. |
254 | * @MD_HAS_PPL: The raid array has PPL feature set. |
255 | * @MD_HAS_MULTIPLE_PPLS: The raid array has multiple PPLs feature set. |
256 | * @MD_NOT_READY: do_md_run() is active, so 'array_state', ust not report that |
257 | * array is ready yet. |
258 | * @MD_BROKEN: This is used to stop writes and mark array as failed. |
259 | * @MD_DELETED: This device is being deleted |
260 | * |
261 | * change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added |
262 | */ |
263 | enum mddev_flags { |
264 | MD_ARRAY_FIRST_USE, |
265 | MD_CLOSING, |
266 | MD_JOURNAL_CLEAN, |
267 | MD_HAS_JOURNAL, |
268 | MD_CLUSTER_RESYNC_LOCKED, |
269 | MD_FAILFAST_SUPPORTED, |
270 | MD_HAS_PPL, |
271 | MD_HAS_MULTIPLE_PPLS, |
272 | MD_NOT_READY, |
273 | MD_BROKEN, |
274 | MD_DELETED, |
275 | }; |
276 | |
277 | enum mddev_sb_flags { |
278 | MD_SB_CHANGE_DEVS, /* Some device status has changed */ |
279 | MD_SB_CHANGE_CLEAN, /* transition to or from 'clean' */ |
280 | MD_SB_CHANGE_PENDING, /* switch from 'clean' to 'active' in progress */ |
281 | MD_SB_NEED_REWRITE, /* metadata write needs to be repeated */ |
282 | }; |
283 | |
284 | #define NR_SERIAL_INFOS 8 |
285 | /* record current range of serialize IOs */ |
286 | struct serial_info { |
287 | struct rb_node node; |
288 | sector_t start; /* start sector of rb node */ |
289 | sector_t last; /* end sector of rb node */ |
290 | sector_t _subtree_last; /* highest sector in subtree of rb node */ |
291 | }; |
292 | |
293 | /* |
294 | * mddev->curr_resync stores the current sector of the resync but |
295 | * also has some overloaded values. |
296 | */ |
297 | enum { |
298 | /* No resync in progress */ |
299 | MD_RESYNC_NONE = 0, |
300 | /* Yielded to allow another conflicting resync to commence */ |
301 | MD_RESYNC_YIELDED = 1, |
302 | /* Delayed to check that there is no conflict with another sync */ |
303 | MD_RESYNC_DELAYED = 2, |
304 | /* Any value greater than or equal to this is in an active resync */ |
305 | MD_RESYNC_ACTIVE = 3, |
306 | }; |
307 | |
308 | struct mddev { |
309 | void *private; |
310 | struct md_personality *pers; |
311 | dev_t unit; |
312 | int md_minor; |
313 | struct list_head disks; |
314 | unsigned long flags; |
315 | unsigned long sb_flags; |
316 | |
317 | int suspended; |
318 | struct mutex suspend_mutex; |
319 | struct percpu_ref active_io; |
320 | int ro; |
321 | int sysfs_active; /* set when sysfs deletes |
322 | * are happening, so run/ |
323 | * takeover/stop are not safe |
324 | */ |
325 | struct gendisk *gendisk; |
326 | |
327 | struct kobject kobj; |
328 | int hold_active; |
329 | #define UNTIL_IOCTL 1 |
330 | #define UNTIL_STOP 2 |
331 | |
332 | /* Superblock information */ |
333 | int major_version, |
334 | minor_version, |
335 | patch_version; |
336 | int persistent; |
337 | int external; /* metadata is |
338 | * managed externally */ |
339 | char metadata_type[17]; /* externally set*/ |
340 | int chunk_sectors; |
341 | time64_t ctime, utime; |
342 | int level, layout; |
343 | char clevel[16]; |
344 | int raid_disks; |
345 | int max_disks; |
346 | sector_t dev_sectors; /* used size of |
347 | * component devices */ |
348 | sector_t array_sectors; /* exported array size */ |
349 | int external_size; /* size managed |
350 | * externally */ |
351 | __u64 events; |
352 | /* If the last 'event' was simply a clean->dirty transition, and |
353 | * we didn't write it to the spares, then it is safe and simple |
354 | * to just decrement the event count on a dirty->clean transition. |
355 | * So we record that possibility here. |
356 | */ |
357 | int can_decrease_events; |
358 | |
359 | char uuid[16]; |
360 | |
361 | /* If the array is being reshaped, we need to record the |
362 | * new shape and an indication of where we are up to. |
363 | * This is written to the superblock. |
364 | * If reshape_position is MaxSector, then no reshape is happening (yet). |
365 | */ |
366 | sector_t reshape_position; |
367 | int delta_disks, new_level, new_layout; |
368 | int new_chunk_sectors; |
369 | int reshape_backwards; |
370 | |
371 | struct md_thread __rcu *thread; /* management thread */ |
372 | struct md_thread __rcu *sync_thread; /* doing resync or reconstruct */ |
373 | |
374 | /* 'last_sync_action' is initialized to "none". It is set when a |
375 | * sync operation (i.e "data-check", "requested-resync", "resync", |
376 | * "recovery", or "reshape") is started. It holds this value even |
377 | * when the sync thread is "frozen" (interrupted) or "idle" (stopped |
378 | * or finished). It is overwritten when a new sync operation is begun. |
379 | */ |
380 | char *last_sync_action; |
381 | sector_t curr_resync; /* last block scheduled */ |
382 | /* As resync requests can complete out of order, we cannot easily track |
383 | * how much resync has been completed. So we occasionally pause until |
384 | * everything completes, then set curr_resync_completed to curr_resync. |
385 | * As such it may be well behind the real resync mark, but it is a value |
386 | * we are certain of. |
387 | */ |
388 | sector_t curr_resync_completed; |
389 | unsigned long resync_mark; /* a recent timestamp */ |
390 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ |
391 | sector_t curr_mark_cnt; /* blocks scheduled now */ |
392 | |
393 | sector_t resync_max_sectors; /* may be set by personality */ |
394 | |
395 | atomic64_t resync_mismatches; /* count of sectors where |
396 | * parity/replica mismatch found |
397 | */ |
398 | |
399 | /* allow user-space to request suspension of IO to regions of the array */ |
400 | sector_t suspend_lo; |
401 | sector_t suspend_hi; |
402 | /* if zero, use the system-wide default */ |
403 | int sync_speed_min; |
404 | int sync_speed_max; |
405 | |
406 | /* resync even though the same disks are shared among md-devices */ |
407 | int parallel_resync; |
408 | |
409 | int ok_start_degraded; |
410 | |
411 | unsigned long recovery; |
412 | /* If a RAID personality determines that recovery (of a particular |
413 | * device) will fail due to a read error on the source device, it |
414 | * takes a copy of this number and does not attempt recovery again |
415 | * until this number changes. |
416 | */ |
417 | int recovery_disabled; |
418 | |
419 | int in_sync; /* know to not need resync */ |
420 | /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so |
421 | * that we are never stopping an array while it is open. |
422 | * 'reconfig_mutex' protects all other reconfiguration. |
423 | * These locks are separate due to conflicting interactions |
424 | * with disk->open_mutex. |
425 | * Lock ordering is: |
426 | * reconfig_mutex -> disk->open_mutex |
427 | * disk->open_mutex -> open_mutex: e.g. __blkdev_get -> md_open |
428 | */ |
429 | struct mutex open_mutex; |
430 | struct mutex reconfig_mutex; |
431 | atomic_t active; /* general refcount */ |
432 | atomic_t openers; /* number of active opens */ |
433 | |
434 | int changed; /* True if we might need to |
435 | * reread partition info */ |
436 | int degraded; /* whether md should consider |
437 | * adding a spare |
438 | */ |
439 | |
440 | atomic_t recovery_active; /* blocks scheduled, but not written */ |
441 | wait_queue_head_t recovery_wait; |
442 | sector_t recovery_cp; |
443 | sector_t resync_min; /* user requested sync |
444 | * starts here */ |
445 | sector_t resync_max; /* resync should pause |
446 | * when it gets here */ |
447 | |
448 | struct kernfs_node *sysfs_state; /* handle for 'array_state' |
449 | * file in sysfs. |
450 | */ |
451 | struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ |
452 | struct kernfs_node *sysfs_completed; /*handle for 'sync_completed' */ |
453 | struct kernfs_node *sysfs_degraded; /*handle for 'degraded' */ |
454 | struct kernfs_node *sysfs_level; /*handle for 'level' */ |
455 | |
456 | /* used for delayed sysfs removal */ |
457 | struct work_struct del_work; |
458 | /* used for register new sync thread */ |
459 | struct work_struct sync_work; |
460 | |
461 | /* "lock" protects: |
462 | * flush_bio transition from NULL to !NULL |
463 | * rdev superblocks, events |
464 | * clearing MD_CHANGE_* |
465 | * in_sync - and related safemode and MD_CHANGE changes |
466 | * pers (also protected by reconfig_mutex and pending IO). |
467 | * clearing ->bitmap |
468 | * clearing ->bitmap_info.file |
469 | * changing ->resync_{min,max} |
470 | * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max}) |
471 | */ |
472 | spinlock_t lock; |
473 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
474 | atomic_t pending_writes; /* number of active superblock writes */ |
475 | |
476 | unsigned int safemode; /* if set, update "clean" superblock |
477 | * when no writes pending. |
478 | */ |
479 | unsigned int safemode_delay; |
480 | struct timer_list safemode_timer; |
481 | struct percpu_ref writes_pending; |
482 | int sync_checkers; /* # of threads checking writes_pending */ |
483 | |
484 | struct bitmap *bitmap; /* the bitmap for the device */ |
485 | struct { |
486 | struct file *file; /* the bitmap file */ |
487 | loff_t offset; /* offset from superblock of |
488 | * start of bitmap. May be |
489 | * negative, but not '0' |
490 | * For external metadata, offset |
491 | * from start of device. |
492 | */ |
493 | unsigned long space; /* space available at this offset */ |
494 | loff_t default_offset; /* this is the offset to use when |
495 | * hot-adding a bitmap. It should |
496 | * eventually be settable by sysfs. |
497 | */ |
498 | unsigned long default_space; /* space available at |
499 | * default offset */ |
500 | struct mutex mutex; |
501 | unsigned long chunksize; |
502 | unsigned long daemon_sleep; /* how many jiffies between updates? */ |
503 | unsigned long max_write_behind; /* write-behind mode */ |
504 | int external; |
505 | int nodes; /* Maximum number of nodes in the cluster */ |
506 | char cluster_name[64]; /* Name of the cluster */ |
507 | } bitmap_info; |
508 | |
509 | atomic_t max_corr_read_errors; /* max read retries */ |
510 | struct list_head all_mddevs; |
511 | |
512 | const struct attribute_group *to_remove; |
513 | |
514 | struct bio_set bio_set; |
515 | struct bio_set sync_set; /* for sync operations like |
516 | * metadata and bitmap writes |
517 | */ |
518 | struct bio_set io_clone_set; |
519 | |
520 | /* Generic flush handling. |
521 | * The last to finish preflush schedules a worker to submit |
522 | * the rest of the request (without the REQ_PREFLUSH flag). |
523 | */ |
524 | struct bio *flush_bio; |
525 | atomic_t flush_pending; |
526 | ktime_t start_flush, prev_flush_start; /* prev_flush_start is when the previous completed |
527 | * flush was started. |
528 | */ |
529 | struct work_struct flush_work; |
530 | struct work_struct event_work; /* used by dm to report failure event */ |
531 | mempool_t *serial_info_pool; |
532 | void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); |
533 | struct md_cluster_info *cluster_info; |
534 | unsigned int good_device_nr; /* good device num within cluster raid */ |
535 | unsigned int noio_flag; /* for memalloc scope API */ |
536 | |
537 | /* |
538 | * Temporarily store rdev that will be finally removed when |
539 | * reconfig_mutex is unlocked, protected by reconfig_mutex. |
540 | */ |
541 | struct list_head deleting; |
542 | |
543 | /* Used to synchronize idle and frozen for action_store() */ |
544 | struct mutex sync_mutex; |
545 | /* The sequence number for sync thread */ |
546 | atomic_t sync_seq; |
547 | |
548 | bool has_superblocks:1; |
549 | bool fail_last_dev:1; |
550 | bool serialize_policy:1; |
551 | }; |
552 | |
553 | enum recovery_flags { |
554 | /* |
555 | * If neither SYNC or RESHAPE are set, then it is a recovery. |
556 | */ |
557 | MD_RECOVERY_RUNNING, /* a thread is running, or about to be started */ |
558 | MD_RECOVERY_SYNC, /* actually doing a resync, not a recovery */ |
559 | MD_RECOVERY_RECOVER, /* doing recovery, or need to try it. */ |
560 | MD_RECOVERY_INTR, /* resync needs to be aborted for some reason */ |
561 | MD_RECOVERY_DONE, /* thread is done and is waiting to be reaped */ |
562 | MD_RECOVERY_NEEDED, /* we might need to start a resync/recover */ |
563 | MD_RECOVERY_REQUESTED, /* user-space has requested a sync (used with SYNC) */ |
564 | MD_RECOVERY_CHECK, /* user-space request for check-only, no repair */ |
565 | MD_RECOVERY_RESHAPE, /* A reshape is happening */ |
566 | MD_RECOVERY_FROZEN, /* User request to abort, and not restart, any action */ |
567 | MD_RECOVERY_ERROR, /* sync-action interrupted because io-error */ |
568 | MD_RECOVERY_WAIT, /* waiting for pers->start() to finish */ |
569 | MD_RESYNCING_REMOTE, /* remote node is running resync thread */ |
570 | }; |
571 | |
572 | enum md_ro_state { |
573 | MD_RDWR, |
574 | MD_RDONLY, |
575 | MD_AUTO_READ, |
576 | MD_MAX_STATE |
577 | }; |
578 | |
579 | static inline bool md_is_rdwr(struct mddev *mddev) |
580 | { |
581 | return (mddev->ro == MD_RDWR); |
582 | } |
583 | |
584 | static inline bool reshape_interrupted(struct mddev *mddev) |
585 | { |
586 | /* reshape never start */ |
587 | if (mddev->reshape_position == MaxSector) |
588 | return false; |
589 | |
590 | /* interrupted */ |
591 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
592 | return true; |
593 | |
594 | /* running reshape will be interrupted soon. */ |
595 | if (test_bit(MD_RECOVERY_WAIT, &mddev->recovery) || |
596 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) || |
597 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
598 | return true; |
599 | |
600 | return false; |
601 | } |
602 | |
603 | static inline int __must_check mddev_lock(struct mddev *mddev) |
604 | { |
605 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
606 | } |
607 | |
608 | /* Sometimes we need to take the lock in a situation where |
609 | * failure due to interrupts is not acceptable. |
610 | */ |
611 | static inline void mddev_lock_nointr(struct mddev *mddev) |
612 | { |
613 | mutex_lock(&mddev->reconfig_mutex); |
614 | } |
615 | |
616 | static inline int mddev_trylock(struct mddev *mddev) |
617 | { |
618 | return mutex_trylock(lock: &mddev->reconfig_mutex); |
619 | } |
620 | extern void mddev_unlock(struct mddev *mddev); |
621 | |
622 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) |
623 | { |
624 | atomic_add(i: nr_sectors, v: &bdev->bd_disk->sync_io); |
625 | } |
626 | |
627 | static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) |
628 | { |
629 | md_sync_acct(bdev: bio->bi_bdev, nr_sectors); |
630 | } |
631 | |
632 | struct md_personality |
633 | { |
634 | char *name; |
635 | int level; |
636 | struct list_head list; |
637 | struct module *owner; |
638 | bool __must_check (*make_request)(struct mddev *mddev, struct bio *bio); |
639 | /* |
640 | * start up works that do NOT require md_thread. tasks that |
641 | * requires md_thread should go into start() |
642 | */ |
643 | int (*run)(struct mddev *mddev); |
644 | /* start up works that require md threads */ |
645 | int (*start)(struct mddev *mddev); |
646 | void (*free)(struct mddev *mddev, void *priv); |
647 | void (*status)(struct seq_file *seq, struct mddev *mddev); |
648 | /* error_handler must set ->faulty and clear ->in_sync |
649 | * if appropriate, and should abort recovery if needed |
650 | */ |
651 | void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); |
652 | int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); |
653 | int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); |
654 | int (*spare_active) (struct mddev *mddev); |
655 | sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped); |
656 | int (*resize) (struct mddev *mddev, sector_t sectors); |
657 | sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); |
658 | int (*check_reshape) (struct mddev *mddev); |
659 | int (*start_reshape) (struct mddev *mddev); |
660 | void (*finish_reshape) (struct mddev *mddev); |
661 | void (*update_reshape_pos) (struct mddev *mddev); |
662 | void (*prepare_suspend) (struct mddev *mddev); |
663 | /* quiesce suspends or resumes internal processing. |
664 | * 1 - stop new actions and wait for action io to complete |
665 | * 0 - return to normal behaviour |
666 | */ |
667 | void (*quiesce) (struct mddev *mddev, int quiesce); |
668 | /* takeover is used to transition an array from one |
669 | * personality to another. The new personality must be able |
670 | * to handle the data in the current layout. |
671 | * e.g. 2drive raid1 -> 2drive raid5 |
672 | * ndrive raid5 -> degraded n+1drive raid6 with special layout |
673 | * If the takeover succeeds, a new 'private' structure is returned. |
674 | * This needs to be installed and then ->run used to activate the |
675 | * array. |
676 | */ |
677 | void *(*takeover) (struct mddev *mddev); |
678 | /* Changes the consistency policy of an active array. */ |
679 | int (*change_consistency_policy)(struct mddev *mddev, const char *buf); |
680 | }; |
681 | |
682 | struct md_sysfs_entry { |
683 | struct attribute attr; |
684 | ssize_t (*show)(struct mddev *, char *); |
685 | ssize_t (*store)(struct mddev *, const char *, size_t); |
686 | }; |
687 | extern const struct attribute_group md_bitmap_group; |
688 | |
689 | static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name) |
690 | { |
691 | if (sd) |
692 | return sysfs_get_dirent(parent: sd, name); |
693 | return sd; |
694 | } |
695 | static inline void sysfs_notify_dirent_safe(struct kernfs_node *sd) |
696 | { |
697 | if (sd) |
698 | sysfs_notify_dirent(kn: sd); |
699 | } |
700 | |
701 | static inline char * mdname (struct mddev * mddev) |
702 | { |
703 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX" ; |
704 | } |
705 | |
706 | static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) |
707 | { |
708 | char nm[20]; |
709 | if (!test_bit(Replacement, &rdev->flags) && |
710 | !test_bit(Journal, &rdev->flags) && |
711 | mddev->kobj.sd) { |
712 | sprintf(buf: nm, fmt: "rd%d" , rdev->raid_disk); |
713 | return sysfs_create_link(kobj: &mddev->kobj, target: &rdev->kobj, name: nm); |
714 | } else |
715 | return 0; |
716 | } |
717 | |
718 | static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) |
719 | { |
720 | char nm[20]; |
721 | if (!test_bit(Replacement, &rdev->flags) && |
722 | !test_bit(Journal, &rdev->flags) && |
723 | mddev->kobj.sd) { |
724 | sprintf(buf: nm, fmt: "rd%d" , rdev->raid_disk); |
725 | sysfs_remove_link(kobj: &mddev->kobj, name: nm); |
726 | } |
727 | } |
728 | |
729 | /* |
730 | * iterates through some rdev ringlist. It's safe to remove the |
731 | * current 'rdev'. Dont touch 'tmp' though. |
732 | */ |
733 | #define rdev_for_each_list(rdev, tmp, head) \ |
734 | list_for_each_entry_safe(rdev, tmp, head, same_set) |
735 | |
736 | /* |
737 | * iterates through the 'same array disks' ringlist |
738 | */ |
739 | #define rdev_for_each(rdev, mddev) \ |
740 | list_for_each_entry(rdev, &((mddev)->disks), same_set) |
741 | |
742 | #define rdev_for_each_safe(rdev, tmp, mddev) \ |
743 | list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) |
744 | |
745 | #define rdev_for_each_rcu(rdev, mddev) \ |
746 | list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) |
747 | |
748 | struct md_thread { |
749 | void (*run) (struct md_thread *thread); |
750 | struct mddev *mddev; |
751 | wait_queue_head_t wqueue; |
752 | unsigned long flags; |
753 | struct task_struct *tsk; |
754 | unsigned long timeout; |
755 | void *private; |
756 | }; |
757 | |
758 | struct md_io_clone { |
759 | struct mddev *mddev; |
760 | struct bio *orig_bio; |
761 | unsigned long start_time; |
762 | struct bio bio_clone; |
763 | }; |
764 | |
765 | #define THREAD_WAKEUP 0 |
766 | |
767 | static inline void safe_put_page(struct page *p) |
768 | { |
769 | if (p) put_page(page: p); |
770 | } |
771 | |
772 | extern int register_md_personality(struct md_personality *p); |
773 | extern int unregister_md_personality(struct md_personality *p); |
774 | extern int register_md_cluster_operations(struct md_cluster_operations *ops, |
775 | struct module *module); |
776 | extern int unregister_md_cluster_operations(void); |
777 | extern int md_setup_cluster(struct mddev *mddev, int nodes); |
778 | extern void md_cluster_stop(struct mddev *mddev); |
779 | extern struct md_thread *md_register_thread( |
780 | void (*run)(struct md_thread *thread), |
781 | struct mddev *mddev, |
782 | const char *name); |
783 | extern void md_unregister_thread(struct mddev *mddev, struct md_thread __rcu **threadp); |
784 | extern void md_wakeup_thread(struct md_thread __rcu *thread); |
785 | extern void md_check_recovery(struct mddev *mddev); |
786 | extern void md_reap_sync_thread(struct mddev *mddev); |
787 | extern bool md_write_start(struct mddev *mddev, struct bio *bi); |
788 | extern void md_write_inc(struct mddev *mddev, struct bio *bi); |
789 | extern void md_write_end(struct mddev *mddev); |
790 | extern void md_done_sync(struct mddev *mddev, int blocks, int ok); |
791 | extern void md_error(struct mddev *mddev, struct md_rdev *rdev); |
792 | extern void md_finish_reshape(struct mddev *mddev); |
793 | void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev, |
794 | struct bio *bio, sector_t start, sector_t size); |
795 | void md_account_bio(struct mddev *mddev, struct bio **bio); |
796 | void md_free_cloned_bio(struct bio *bio); |
797 | |
798 | extern bool __must_check md_flush_request(struct mddev *mddev, struct bio *bio); |
799 | extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
800 | sector_t sector, int size, struct page *page); |
801 | extern int md_super_wait(struct mddev *mddev); |
802 | extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
803 | struct page *page, blk_opf_t opf, bool metadata_op); |
804 | extern void md_do_sync(struct md_thread *thread); |
805 | extern void md_new_event(void); |
806 | extern void md_allow_write(struct mddev *mddev); |
807 | extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); |
808 | extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); |
809 | extern int md_check_no_bitmap(struct mddev *mddev); |
810 | extern int md_integrity_register(struct mddev *mddev); |
811 | extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); |
812 | extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); |
813 | |
814 | extern int mddev_init(struct mddev *mddev); |
815 | extern void mddev_destroy(struct mddev *mddev); |
816 | struct mddev *md_alloc(dev_t dev, char *name); |
817 | void mddev_put(struct mddev *mddev); |
818 | extern int md_run(struct mddev *mddev); |
819 | extern int md_start(struct mddev *mddev); |
820 | extern void md_stop(struct mddev *mddev); |
821 | extern void md_stop_writes(struct mddev *mddev); |
822 | extern int md_rdev_init(struct md_rdev *rdev); |
823 | extern void md_rdev_clear(struct md_rdev *rdev); |
824 | |
825 | extern bool md_handle_request(struct mddev *mddev, struct bio *bio); |
826 | extern int mddev_suspend(struct mddev *mddev, bool interruptible); |
827 | extern void mddev_resume(struct mddev *mddev); |
828 | extern void md_idle_sync_thread(struct mddev *mddev); |
829 | extern void md_frozen_sync_thread(struct mddev *mddev); |
830 | extern void md_unfrozen_sync_thread(struct mddev *mddev); |
831 | |
832 | extern void md_reload_sb(struct mddev *mddev, int raid_disk); |
833 | extern void md_update_sb(struct mddev *mddev, int force); |
834 | extern void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev); |
835 | extern void mddev_destroy_serial_pool(struct mddev *mddev, |
836 | struct md_rdev *rdev); |
837 | struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); |
838 | struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev); |
839 | |
840 | static inline bool is_rdev_broken(struct md_rdev *rdev) |
841 | { |
842 | return !disk_live(disk: rdev->bdev->bd_disk); |
843 | } |
844 | |
845 | static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) |
846 | { |
847 | int faulty = test_bit(Faulty, &rdev->flags); |
848 | if (atomic_dec_and_test(v: &rdev->nr_pending) && faulty) { |
849 | set_bit(nr: MD_RECOVERY_NEEDED, addr: &mddev->recovery); |
850 | md_wakeup_thread(thread: mddev->thread); |
851 | } |
852 | } |
853 | |
854 | extern struct md_cluster_operations *md_cluster_ops; |
855 | static inline int mddev_is_clustered(struct mddev *mddev) |
856 | { |
857 | return mddev->cluster_info && mddev->bitmap_info.nodes > 1; |
858 | } |
859 | |
860 | /* clear unsupported mddev_flags */ |
861 | static inline void mddev_clear_unsupported_flags(struct mddev *mddev, |
862 | unsigned long unsupported_flags) |
863 | { |
864 | mddev->flags &= ~unsupported_flags; |
865 | } |
866 | |
867 | static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio) |
868 | { |
869 | if (bio_op(bio) == REQ_OP_WRITE_ZEROES && |
870 | !bio->bi_bdev->bd_disk->queue->limits.max_write_zeroes_sectors) |
871 | mddev->gendisk->queue->limits.max_write_zeroes_sectors = 0; |
872 | } |
873 | |
874 | static inline int mddev_suspend_and_lock(struct mddev *mddev) |
875 | { |
876 | int ret; |
877 | |
878 | ret = mddev_suspend(mddev, interruptible: true); |
879 | if (ret) |
880 | return ret; |
881 | |
882 | ret = mddev_lock(mddev); |
883 | if (ret) |
884 | mddev_resume(mddev); |
885 | |
886 | return ret; |
887 | } |
888 | |
889 | static inline void mddev_suspend_and_lock_nointr(struct mddev *mddev) |
890 | { |
891 | mddev_suspend(mddev, interruptible: false); |
892 | mutex_lock(&mddev->reconfig_mutex); |
893 | } |
894 | |
895 | static inline void mddev_unlock_and_resume(struct mddev *mddev) |
896 | { |
897 | mddev_unlock(mddev); |
898 | mddev_resume(mddev); |
899 | } |
900 | |
901 | struct mdu_array_info_s; |
902 | struct mdu_disk_info_s; |
903 | |
904 | extern int mdp_major; |
905 | extern struct workqueue_struct *md_bitmap_wq; |
906 | void md_autostart_arrays(int part); |
907 | int md_set_array_info(struct mddev *mddev, struct mdu_array_info_s *info); |
908 | int md_add_new_disk(struct mddev *mddev, struct mdu_disk_info_s *info); |
909 | int do_md_run(struct mddev *mddev); |
910 | void mddev_stack_rdev_limits(struct mddev *mddev, struct queue_limits *lim); |
911 | int mddev_stack_new_rdev(struct mddev *mddev, struct md_rdev *rdev); |
912 | void mddev_update_io_opt(struct mddev *mddev, unsigned int nr_stripes); |
913 | |
914 | extern const struct block_device_operations md_fops; |
915 | |
916 | /* |
917 | * MD devices can be used undeneath by DM, in which case ->gendisk is NULL. |
918 | */ |
919 | static inline bool mddev_is_dm(struct mddev *mddev) |
920 | { |
921 | return !mddev->gendisk; |
922 | } |
923 | |
924 | static inline void mddev_trace_remap(struct mddev *mddev, struct bio *bio, |
925 | sector_t sector) |
926 | { |
927 | if (!mddev_is_dm(mddev)) |
928 | trace_block_bio_remap(bio, dev: disk_devt(disk: mddev->gendisk), from: sector); |
929 | } |
930 | |
931 | #define mddev_add_trace_msg(mddev, fmt, args...) \ |
932 | do { \ |
933 | if (!mddev_is_dm(mddev)) \ |
934 | blk_add_trace_msg((mddev)->gendisk->queue, fmt, ##args); \ |
935 | } while (0) |
936 | |
937 | #endif /* _MD_MD_H */ |
938 | |