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af1a8899 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 | 2 | /* |
7e841526 | 3 | md.h : kernel internal structure of the Linux MD driver |
1da177e4 | 4 | Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman |
f72ffdd6 | 5 | |
1da177e4 LT |
6 | */ |
7 | ||
63fe0817 CH |
8 | #ifndef _MD_MD_H |
9 | #define _MD_MD_H | |
10 | ||
11 | #include <linux/blkdev.h> | |
66114cad | 12 | #include <linux/backing-dev.h> |
fc974ee2 | 13 | #include <linux/badblocks.h> |
63fe0817 CH |
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> | |
edb39c9d | 21 | #include "md-cluster.h" |
9361401e | 22 | |
1da177e4 | 23 | #define MaxSector (~(sector_t)0) |
1da177e4 | 24 | |
46533ff7 N |
25 | /* |
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 | |
32 | * be retried. | |
33 | */ | |
34 | #define MD_FAILFAST (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT) | |
69b00b5b GJ |
35 | |
36 | /* | |
37 | * The struct embedded in rdev is used to serialize IO. | |
38 | */ | |
39 | struct serial_in_rdev { | |
40 | struct rb_root_cached serial_rb; | |
41 | spinlock_t serial_lock; | |
42 | wait_queue_head_t serial_io_wait; | |
43 | }; | |
44 | ||
1da177e4 LT |
45 | /* |
46 | * MD's 'extended' device | |
47 | */ | |
3cb03002 | 48 | struct md_rdev { |
1da177e4 LT |
49 | struct list_head same_set; /* RAID devices within the same set */ |
50 | ||
dd8ac336 | 51 | sector_t sectors; /* Device size (in 512bytes sectors) */ |
fd01b88c | 52 | struct mddev *mddev; /* RAID array if running */ |
eea1bf38 | 53 | int last_events; /* IO event timestamp */ |
1da177e4 | 54 | |
a6ff7e08 JB |
55 | /* |
56 | * If meta_bdev is non-NULL, it means that a separate device is | |
57 | * being used to store the metadata (superblock/bitmap) which | |
58 | * would otherwise be contained on the same device as the data (bdev). | |
59 | */ | |
60 | struct block_device *meta_bdev; | |
1da177e4 LT |
61 | struct block_device *bdev; /* block device handle */ |
62 | ||
2699b672 | 63 | struct page *sb_page, *bb_page; |
1da177e4 | 64 | int sb_loaded; |
42543769 | 65 | __u64 sb_events; |
1da177e4 | 66 | sector_t data_offset; /* start of data in array */ |
c6563a8c | 67 | sector_t new_data_offset;/* only relevant while reshaping */ |
f72ffdd6 | 68 | sector_t sb_start; /* offset of the super block (in 512byte sectors) */ |
0002b271 | 69 | int sb_size; /* bytes in the superblock */ |
1da177e4 LT |
70 | int preferred_minor; /* autorun support */ |
71 | ||
86e6ffdd N |
72 | struct kobject kobj; |
73 | ||
1da177e4 LT |
74 | /* A device can be in one of three states based on two flags: |
75 | * Not working: faulty==1 in_sync==0 | |
76 | * Fully working: faulty==0 in_sync==1 | |
77 | * Working, but not | |
78 | * in sync with array | |
79 | * faulty==0 in_sync==0 | |
80 | * | |
81 | * It can never have faulty==1, in_sync==1 | |
82 | * This reduces the burden of testing multiple flags in many cases | |
83 | */ | |
1da177e4 | 84 | |
2d78f8c4 | 85 | unsigned long flags; /* bit set of 'enum flag_bits' bits. */ |
6bfe0b49 | 86 | wait_queue_head_t blocked_wait; |
8ddf9efe | 87 | |
1da177e4 LT |
88 | int desc_nr; /* descriptor index in the superblock */ |
89 | int raid_disk; /* role of device in array */ | |
e93f68a1 N |
90 | int new_raid_disk; /* role that the device will have in |
91 | * the array after a level-change completes. | |
92 | */ | |
41158c7e N |
93 | int saved_raid_disk; /* role that device used to have in the |
94 | * array and could again if we did a partial | |
95 | * resync from the bitmap | |
96 | */ | |
3069aa8d SL |
97 | union { |
98 | sector_t recovery_offset;/* If this device has been partially | |
5fd6c1dc N |
99 | * recovered, this is where we were |
100 | * up to. | |
101 | */ | |
3069aa8d SL |
102 | sector_t journal_tail; /* If this device is a journal device, |
103 | * this is the journal tail (journal | |
104 | * recovery start point) | |
105 | */ | |
106 | }; | |
1da177e4 LT |
107 | |
108 | atomic_t nr_pending; /* number of pending requests. | |
109 | * only maintained for arrays that | |
110 | * support hot removal | |
111 | */ | |
ba22dcbf N |
112 | atomic_t read_errors; /* number of consecutive read errors that |
113 | * we have tried to ignore. | |
114 | */ | |
0e3ef49e | 115 | time64_t last_read_error; /* monotonic time since our |
1e50915f RB |
116 | * last read error |
117 | */ | |
4dbcdc75 N |
118 | atomic_t corrected_errors; /* number of corrected read errors, |
119 | * for reporting to userspace and storing | |
120 | * in superblock. | |
121 | */ | |
3e148a32 | 122 | |
69b00b5b | 123 | struct serial_in_rdev *serial; /* used for raid1 io serialization */ |
3e148a32 | 124 | |
5792a285 | 125 | struct work_struct del_work; /* used for delayed sysfs removal */ |
3c0ee63a | 126 | |
324a56e1 | 127 | struct kernfs_node *sysfs_state; /* handle for 'state' |
3c0ee63a | 128 | * sysfs entry */ |
2230dfe4 | 129 | |
fc974ee2 | 130 | struct badblocks badblocks; |
ea0213e0 AP |
131 | |
132 | struct { | |
133 | short offset; /* Offset from superblock to start of PPL. | |
134 | * Not used by external metadata. */ | |
135 | unsigned int size; /* Size in sectors of the PPL space */ | |
136 | sector_t sector; /* First sector of the PPL space */ | |
137 | } ppl; | |
1da177e4 | 138 | }; |
2d78f8c4 N |
139 | enum flag_bits { |
140 | Faulty, /* device is known to have a fault */ | |
141 | In_sync, /* device is in_sync with rest of array */ | |
8313b8e5 | 142 | Bitmap_sync, /* ..actually, not quite In_sync. Need a |
4aaf7694 GJ |
143 | * bitmap-based recovery to get fully in sync. |
144 | * The bit is only meaningful before device | |
145 | * has been passed to pers->hot_add_disk. | |
8313b8e5 | 146 | */ |
2d78f8c4 N |
147 | WriteMostly, /* Avoid reading if at all possible */ |
148 | AutoDetected, /* added by auto-detect */ | |
149 | Blocked, /* An error occurred but has not yet | |
150 | * been acknowledged by the metadata | |
151 | * handler, so don't allow writes | |
152 | * until it is cleared */ | |
153 | WriteErrorSeen, /* A write error has been seen on this | |
154 | * device | |
155 | */ | |
156 | FaultRecorded, /* Intermediate state for clearing | |
157 | * Blocked. The Fault is/will-be | |
158 | * recorded in the metadata, but that | |
159 | * metadata hasn't been stored safely | |
160 | * on disk yet. | |
161 | */ | |
162 | BlockedBadBlocks, /* A writer is blocked because they | |
163 | * found an unacknowledged bad-block. | |
164 | * This can safely be cleared at any | |
165 | * time, and the writer will re-check. | |
166 | * It may be set at any time, and at | |
167 | * worst the writer will timeout and | |
168 | * re-check. So setting it as | |
169 | * accurately as possible is good, but | |
170 | * not absolutely critical. | |
171 | */ | |
172 | WantReplacement, /* This device is a candidate to be | |
173 | * hot-replaced, either because it has | |
174 | * reported some faults, or because | |
175 | * of explicit request. | |
176 | */ | |
177 | Replacement, /* This device is a replacement for | |
178 | * a want_replacement device with same | |
179 | * raid_disk number. | |
180 | */ | |
1aee41f6 GR |
181 | Candidate, /* For clustered environments only: |
182 | * This device is seen locally but not | |
183 | * by the whole cluster | |
184 | */ | |
bac624f3 SL |
185 | Journal, /* This device is used as journal for |
186 | * raid-5/6. | |
187 | * Usually, this device should be faster | |
188 | * than other devices in the array | |
189 | */ | |
659b254f | 190 | ClusterRemove, |
d787be40 N |
191 | RemoveSynchronized, /* synchronize_rcu() was called after |
192 | * this device was known to be faulty, | |
193 | * so it is safe to remove without | |
194 | * another synchronize_rcu() call. | |
195 | */ | |
35b785f7 TM |
196 | ExternalBbl, /* External metadata provides bad |
197 | * block management for a disk | |
198 | */ | |
688834e6 N |
199 | FailFast, /* Minimal retries should be attempted on |
200 | * this device, so use REQ_FAILFAST_DEV. | |
201 | * Also don't try to repair failed reads. | |
202 | * It is expects that no bad block log | |
203 | * is present. | |
204 | */ | |
46533ff7 N |
205 | LastDev, /* Seems to be the last working dev as |
206 | * it didn't fail, so don't use FailFast | |
207 | * any more for metadata | |
208 | */ | |
404659cf GJ |
209 | CollisionCheck, /* |
210 | * check if there is collision between raid1 | |
211 | * serial bios. | |
3e148a32 | 212 | */ |
2d78f8c4 | 213 | }; |
1da177e4 | 214 | |
3cb03002 | 215 | static inline int is_badblock(struct md_rdev *rdev, sector_t s, int sectors, |
2230dfe4 N |
216 | sector_t *first_bad, int *bad_sectors) |
217 | { | |
218 | if (unlikely(rdev->badblocks.count)) { | |
fc974ee2 | 219 | int rv = badblocks_check(&rdev->badblocks, rdev->data_offset + s, |
2230dfe4 N |
220 | sectors, |
221 | first_bad, bad_sectors); | |
222 | if (rv) | |
223 | *first_bad -= rdev->data_offset; | |
224 | return rv; | |
225 | } | |
226 | return 0; | |
227 | } | |
3cb03002 | 228 | extern int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c N |
229 | int is_new); |
230 | extern int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, | |
231 | int is_new); | |
c4ce867f GR |
232 | struct md_cluster_info; |
233 | ||
394ed8e4 | 234 | /* change UNSUPPORTED_MDDEV_FLAGS for each array type if new flag is added */ |
be306c29 | 235 | enum mddev_flags { |
be306c29 N |
236 | MD_ARRAY_FIRST_USE, /* First use of array, needs initialization */ |
237 | MD_CLOSING, /* If set, we are closing the array, do not open | |
238 | * it then */ | |
239 | MD_JOURNAL_CLEAN, /* A raid with journal is already clean */ | |
240 | MD_HAS_JOURNAL, /* The raid array has journal feature set */ | |
be306c29 N |
241 | MD_CLUSTER_RESYNC_LOCKED, /* cluster raid only, which means node |
242 | * already took resync lock, need to | |
243 | * release the lock */ | |
46533ff7 N |
244 | MD_FAILFAST_SUPPORTED, /* Using MD_FAILFAST on metadata writes is |
245 | * supported as calls to md_error() will | |
246 | * never cause the array to become failed. | |
247 | */ | |
ea0213e0 | 248 | MD_HAS_PPL, /* The raid array has PPL feature set */ |
ddc08823 | 249 | MD_HAS_MULTIPLE_PPLS, /* The raid array has multiple PPLs feature set */ |
35bfc521 N |
250 | MD_ALLOW_SB_UPDATE, /* md_check_recovery is allowed to update |
251 | * the metadata without taking reconfig_mutex. | |
252 | */ | |
253 | MD_UPDATING_SB, /* md_check_recovery is updating the metadata | |
254 | * without explicitly holding reconfig_mutex. | |
255 | */ | |
9d4b45d6 N |
256 | MD_NOT_READY, /* do_md_run() is active, so 'array_state' |
257 | * must not report that array is ready yet | |
258 | */ | |
62f7b198 GP |
259 | MD_BROKEN, /* This is used in RAID-0/LINEAR only, to stop |
260 | * I/O in case an array member is gone/failed. | |
261 | */ | |
be306c29 | 262 | }; |
2953079c SL |
263 | |
264 | enum mddev_sb_flags { | |
265 | MD_SB_CHANGE_DEVS, /* Some device status has changed */ | |
266 | MD_SB_CHANGE_CLEAN, /* transition to or from 'clean' */ | |
267 | MD_SB_CHANGE_PENDING, /* switch from 'clean' to 'active' in progress */ | |
268 | MD_SB_NEED_REWRITE, /* metadata write needs to be repeated */ | |
269 | }; | |
270 | ||
404659cf GJ |
271 | #define NR_SERIAL_INFOS 8 |
272 | /* record current range of serialize IOs */ | |
273 | struct serial_info { | |
69b00b5b GJ |
274 | struct rb_node node; |
275 | sector_t start; /* start sector of rb node */ | |
276 | sector_t last; /* end sector of rb node */ | |
277 | sector_t _subtree_last; /* highest sector in subtree of rb node */ | |
3e148a32 GJ |
278 | }; |
279 | ||
fd01b88c | 280 | struct mddev { |
1da177e4 | 281 | void *private; |
84fc4b56 | 282 | struct md_personality *pers; |
1da177e4 LT |
283 | dev_t unit; |
284 | int md_minor; | |
7a0a5355 | 285 | struct list_head disks; |
850b2b42 | 286 | unsigned long flags; |
2953079c | 287 | unsigned long sb_flags; |
850b2b42 | 288 | |
409c57f3 N |
289 | int suspended; |
290 | atomic_t active_io; | |
1da177e4 | 291 | int ro; |
bb4f1e9d N |
292 | int sysfs_active; /* set when sysfs deletes |
293 | * are happening, so run/ | |
294 | * takeover/stop are not safe | |
295 | */ | |
1da177e4 LT |
296 | struct gendisk *gendisk; |
297 | ||
eae1701f | 298 | struct kobject kobj; |
d3374825 N |
299 | int hold_active; |
300 | #define UNTIL_IOCTL 1 | |
efeb53c0 | 301 | #define UNTIL_STOP 2 |
eae1701f | 302 | |
1da177e4 LT |
303 | /* Superblock information */ |
304 | int major_version, | |
305 | minor_version, | |
306 | patch_version; | |
307 | int persistent; | |
f72ffdd6 | 308 | int external; /* metadata is |
e691063a N |
309 | * managed externally */ |
310 | char metadata_type[17]; /* externally set*/ | |
9d8f0363 | 311 | int chunk_sectors; |
9ebc6ef1 | 312 | time64_t ctime, utime; |
1da177e4 | 313 | int level, layout; |
d9d166c2 | 314 | char clevel[16]; |
1da177e4 LT |
315 | int raid_disks; |
316 | int max_disks; | |
f72ffdd6 | 317 | sector_t dev_sectors; /* used size of |
58c0fed4 | 318 | * component devices */ |
f233ea5c | 319 | sector_t array_sectors; /* exported array size */ |
b522adcd DW |
320 | int external_size; /* size managed |
321 | * externally */ | |
1da177e4 | 322 | __u64 events; |
a8707c08 N |
323 | /* If the last 'event' was simply a clean->dirty transition, and |
324 | * we didn't write it to the spares, then it is safe and simple | |
325 | * to just decrement the event count on a dirty->clean transition. | |
326 | * So we record that possibility here. | |
327 | */ | |
328 | int can_decrease_events; | |
1da177e4 LT |
329 | |
330 | char uuid[16]; | |
331 | ||
f6705578 N |
332 | /* If the array is being reshaped, we need to record the |
333 | * new shape and an indication of where we are up to. | |
334 | * This is written to the superblock. | |
335 | * If reshape_position is MaxSector, then no reshape is happening (yet). | |
336 | */ | |
337 | sector_t reshape_position; | |
664e7c41 AN |
338 | int delta_disks, new_level, new_layout; |
339 | int new_chunk_sectors; | |
2c810cdd | 340 | int reshape_backwards; |
f6705578 | 341 | |
2b8bf345 N |
342 | struct md_thread *thread; /* management thread */ |
343 | struct md_thread *sync_thread; /* doing resync or reconstruct */ | |
c4a39551 JB |
344 | |
345 | /* 'last_sync_action' is initialized to "none". It is set when a | |
346 | * sync operation (i.e "data-check", "requested-resync", "resync", | |
347 | * "recovery", or "reshape") is started. It holds this value even | |
348 | * when the sync thread is "frozen" (interrupted) or "idle" (stopped | |
349 | * or finished). It is overwritten when a new sync operation is begun. | |
350 | */ | |
351 | char *last_sync_action; | |
ff4e8d9a | 352 | sector_t curr_resync; /* last block scheduled */ |
97e4f42d N |
353 | /* As resync requests can complete out of order, we cannot easily track |
354 | * how much resync has been completed. So we occasionally pause until | |
355 | * everything completes, then set curr_resync_completed to curr_resync. | |
356 | * As such it may be well behind the real resync mark, but it is a value | |
357 | * we are certain of. | |
358 | */ | |
359 | sector_t curr_resync_completed; | |
1da177e4 LT |
360 | unsigned long resync_mark; /* a recent timestamp */ |
361 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ | |
ff4e8d9a | 362 | sector_t curr_mark_cnt; /* blocks scheduled now */ |
1da177e4 LT |
363 | |
364 | sector_t resync_max_sectors; /* may be set by personality */ | |
9d88883e | 365 | |
7f7583d4 | 366 | atomic64_t resync_mismatches; /* count of sectors where |
9d88883e N |
367 | * parity/replica mismatch found |
368 | */ | |
e464eafd N |
369 | |
370 | /* allow user-space to request suspension of IO to regions of the array */ | |
371 | sector_t suspend_lo; | |
372 | sector_t suspend_hi; | |
88202a0c N |
373 | /* if zero, use the system-wide default */ |
374 | int sync_speed_min; | |
375 | int sync_speed_max; | |
376 | ||
90b08710 BS |
377 | /* resync even though the same disks are shared among md-devices */ |
378 | int parallel_resync; | |
379 | ||
6ff8d8ec | 380 | int ok_start_degraded; |
5fd6c1dc | 381 | |
1da177e4 | 382 | unsigned long recovery; |
5389042f N |
383 | /* If a RAID personality determines that recovery (of a particular |
384 | * device) will fail due to a read error on the source device, it | |
385 | * takes a copy of this number and does not attempt recovery again | |
386 | * until this number changes. | |
387 | */ | |
388 | int recovery_disabled; | |
1da177e4 LT |
389 | |
390 | int in_sync; /* know to not need resync */ | |
c8c00a69 N |
391 | /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so |
392 | * that we are never stopping an array while it is open. | |
393 | * 'reconfig_mutex' protects all other reconfiguration. | |
394 | * These locks are separate due to conflicting interactions | |
395 | * with bdev->bd_mutex. | |
396 | * Lock ordering is: | |
397 | * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk | |
398 | * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open | |
399 | */ | |
400 | struct mutex open_mutex; | |
df5b89b3 | 401 | struct mutex reconfig_mutex; |
f2ea68cf N |
402 | atomic_t active; /* general refcount */ |
403 | atomic_t openers; /* number of active opens */ | |
1da177e4 | 404 | |
f0b4f7e2 N |
405 | int changed; /* True if we might need to |
406 | * reread partition info */ | |
1da177e4 LT |
407 | int degraded; /* whether md should consider |
408 | * adding a spare | |
409 | */ | |
410 | ||
411 | atomic_t recovery_active; /* blocks scheduled, but not written */ | |
412 | wait_queue_head_t recovery_wait; | |
413 | sector_t recovery_cp; | |
5e96ee65 NB |
414 | sector_t resync_min; /* user requested sync |
415 | * starts here */ | |
c6207277 N |
416 | sector_t resync_max; /* resync should pause |
417 | * when it gets here */ | |
06d91a5f | 418 | |
324a56e1 | 419 | struct kernfs_node *sysfs_state; /* handle for 'array_state' |
b62b7590 N |
420 | * file in sysfs. |
421 | */ | |
324a56e1 | 422 | struct kernfs_node *sysfs_action; /* handle for 'sync_action' */ |
b62b7590 | 423 | |
d3374825 N |
424 | struct work_struct del_work; /* used for delayed sysfs removal */ |
425 | ||
85572d7c N |
426 | /* "lock" protects: |
427 | * flush_bio transition from NULL to !NULL | |
428 | * rdev superblocks, events | |
429 | * clearing MD_CHANGE_* | |
430 | * in_sync - and related safemode and MD_CHANGE changes | |
36d091f4 | 431 | * pers (also protected by reconfig_mutex and pending IO). |
978a7a47 | 432 | * clearing ->bitmap |
4af1a041 | 433 | * clearing ->bitmap_info.file |
23da422b N |
434 | * changing ->resync_{min,max} |
435 | * setting MD_RECOVERY_RUNNING (which interacts with resync_{min,max}) | |
85572d7c N |
436 | */ |
437 | spinlock_t lock; | |
3d310eb7 | 438 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
7bfa19f2 | 439 | atomic_t pending_writes; /* number of active superblock writes */ |
06d91a5f | 440 | |
1da177e4 LT |
441 | unsigned int safemode; /* if set, update "clean" superblock |
442 | * when no writes pending. | |
f72ffdd6 | 443 | */ |
1da177e4 LT |
444 | unsigned int safemode_delay; |
445 | struct timer_list safemode_timer; | |
4ad23a97 N |
446 | struct percpu_ref writes_pending; |
447 | int sync_checkers; /* # of threads checking writes_pending */ | |
165125e1 | 448 | struct request_queue *queue; /* for plugging ... */ |
1da177e4 | 449 | |
f72ffdd6 | 450 | struct bitmap *bitmap; /* the bitmap for the device */ |
c3d9714e N |
451 | struct { |
452 | struct file *file; /* the bitmap file */ | |
f6af949c | 453 | loff_t offset; /* offset from superblock of |
c3d9714e N |
454 | * start of bitmap. May be |
455 | * negative, but not '0' | |
f6af949c | 456 | * For external metadata, offset |
f72ffdd6 | 457 | * from start of device. |
c3d9714e | 458 | */ |
6409bb05 | 459 | unsigned long space; /* space available at this offset */ |
f6af949c | 460 | loff_t default_offset; /* this is the offset to use when |
c3d9714e N |
461 | * hot-adding a bitmap. It should |
462 | * eventually be settable by sysfs. | |
463 | */ | |
6409bb05 N |
464 | unsigned long default_space; /* space available at |
465 | * default offset */ | |
c3d9714e | 466 | struct mutex mutex; |
42a04b50 | 467 | unsigned long chunksize; |
ac2f40be | 468 | unsigned long daemon_sleep; /* how many jiffies between updates? */ |
42a04b50 | 469 | unsigned long max_write_behind; /* write-behind mode */ |
ece5cff0 | 470 | int external; |
c4ce867f | 471 | int nodes; /* Maximum number of nodes in the cluster */ |
cf921cc1 | 472 | char cluster_name[64]; /* Name of the cluster */ |
c3d9714e | 473 | } bitmap_info; |
32a7627c | 474 | |
f72ffdd6 | 475 | atomic_t max_corr_read_errors; /* max read retries */ |
1da177e4 | 476 | struct list_head all_mddevs; |
a2826aa9 | 477 | |
a64c876f | 478 | struct attribute_group *to_remove; |
252ac522 | 479 | |
afeee514 KO |
480 | struct bio_set bio_set; |
481 | struct bio_set sync_set; /* for sync operations like | |
5a85071c N |
482 | * metadata and bitmap writes |
483 | */ | |
a167f663 | 484 | |
4bc034d3 N |
485 | /* Generic flush handling. |
486 | * The last to finish preflush schedules a worker to submit | |
487 | * the rest of the request (without the REQ_PREFLUSH flag). | |
488 | */ | |
489 | struct bio *flush_bio; | |
490 | atomic_t flush_pending; | |
2bc13b83 N |
491 | ktime_t start_flush, last_flush; /* last_flush is when the last completed |
492 | * flush was started. | |
493 | */ | |
4bc034d3 | 494 | struct work_struct flush_work; |
768a418d | 495 | struct work_struct event_work; /* used by dm to report failure event */ |
404659cf | 496 | mempool_t *serial_info_pool; |
fd01b88c | 497 | void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); |
c4ce867f | 498 | struct md_cluster_info *cluster_info; |
15858fa5 | 499 | unsigned int good_device_nr; /* good device num within cluster raid */ |
4b6c1060 HM |
500 | |
501 | bool has_superblocks:1; | |
9a567843 | 502 | bool fail_last_dev:1; |
3938f5fb | 503 | bool serialize_policy:1; |
be306c29 N |
504 | }; |
505 | ||
506 | enum recovery_flags { | |
507 | /* | |
508 | * If neither SYNC or RESHAPE are set, then it is a recovery. | |
509 | */ | |
510 | MD_RECOVERY_RUNNING, /* a thread is running, or about to be started */ | |
511 | MD_RECOVERY_SYNC, /* actually doing a resync, not a recovery */ | |
512 | MD_RECOVERY_RECOVER, /* doing recovery, or need to try it. */ | |
513 | MD_RECOVERY_INTR, /* resync needs to be aborted for some reason */ | |
514 | MD_RECOVERY_DONE, /* thread is done and is waiting to be reaped */ | |
515 | MD_RECOVERY_NEEDED, /* we might need to start a resync/recover */ | |
516 | MD_RECOVERY_REQUESTED, /* user-space has requested a sync (used with SYNC) */ | |
517 | MD_RECOVERY_CHECK, /* user-space request for check-only, no repair */ | |
518 | MD_RECOVERY_RESHAPE, /* A reshape is happening */ | |
519 | MD_RECOVERY_FROZEN, /* User request to abort, and not restart, any action */ | |
520 | MD_RECOVERY_ERROR, /* sync-action interrupted because io-error */ | |
d5d885fd | 521 | MD_RECOVERY_WAIT, /* waiting for pers->start() to finish */ |
0357ba27 | 522 | MD_RESYNCING_REMOTE, /* remote node is running resync thread */ |
1da177e4 LT |
523 | }; |
524 | ||
5c47daf6 N |
525 | static inline int __must_check mddev_lock(struct mddev *mddev) |
526 | { | |
527 | return mutex_lock_interruptible(&mddev->reconfig_mutex); | |
528 | } | |
529 | ||
530 | /* Sometimes we need to take the lock in a situation where | |
531 | * failure due to interrupts is not acceptable. | |
532 | */ | |
533 | static inline void mddev_lock_nointr(struct mddev *mddev) | |
534 | { | |
535 | mutex_lock(&mddev->reconfig_mutex); | |
536 | } | |
537 | ||
5c47daf6 N |
538 | static inline int mddev_trylock(struct mddev *mddev) |
539 | { | |
540 | return mutex_trylock(&mddev->reconfig_mutex); | |
541 | } | |
542 | extern void mddev_unlock(struct mddev *mddev); | |
543 | ||
1da177e4 LT |
544 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) |
545 | { | |
f72ffdd6 | 546 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); |
1da177e4 LT |
547 | } |
548 | ||
74d46992 CH |
549 | static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) |
550 | { | |
551 | atomic_add(nr_sectors, &bio->bi_disk->sync_io); | |
552 | } | |
553 | ||
84fc4b56 | 554 | struct md_personality |
1da177e4 LT |
555 | { |
556 | char *name; | |
2604b703 N |
557 | int level; |
558 | struct list_head list; | |
1da177e4 | 559 | struct module *owner; |
775d7831 | 560 | bool __must_check (*make_request)(struct mddev *mddev, struct bio *bio); |
d5d885fd SL |
561 | /* |
562 | * start up works that do NOT require md_thread. tasks that | |
563 | * requires md_thread should go into start() | |
564 | */ | |
fd01b88c | 565 | int (*run)(struct mddev *mddev); |
d5d885fd SL |
566 | /* start up works that require md threads */ |
567 | int (*start)(struct mddev *mddev); | |
afa0f557 | 568 | void (*free)(struct mddev *mddev, void *priv); |
fd01b88c | 569 | void (*status)(struct seq_file *seq, struct mddev *mddev); |
1da177e4 | 570 | /* error_handler must set ->faulty and clear ->in_sync |
f72ffdd6 | 571 | * if appropriate, and should abort recovery if needed |
1da177e4 | 572 | */ |
fd01b88c N |
573 | void (*error_handler)(struct mddev *mddev, struct md_rdev *rdev); |
574 | int (*hot_add_disk) (struct mddev *mddev, struct md_rdev *rdev); | |
b8321b68 | 575 | int (*hot_remove_disk) (struct mddev *mddev, struct md_rdev *rdev); |
fd01b88c | 576 | int (*spare_active) (struct mddev *mddev); |
09314799 | 577 | sector_t (*sync_request)(struct mddev *mddev, sector_t sector_nr, int *skipped); |
fd01b88c N |
578 | int (*resize) (struct mddev *mddev, sector_t sectors); |
579 | sector_t (*size) (struct mddev *mddev, sector_t sectors, int raid_disks); | |
580 | int (*check_reshape) (struct mddev *mddev); | |
581 | int (*start_reshape) (struct mddev *mddev); | |
582 | void (*finish_reshape) (struct mddev *mddev); | |
7564beda | 583 | void (*update_reshape_pos) (struct mddev *mddev); |
b03e0ccb N |
584 | /* quiesce suspends or resumes internal processing. |
585 | * 1 - stop new actions and wait for action io to complete | |
586 | * 0 - return to normal behaviour | |
36fa3063 | 587 | */ |
b03e0ccb | 588 | void (*quiesce) (struct mddev *mddev, int quiesce); |
245f46c2 N |
589 | /* takeover is used to transition an array from one |
590 | * personality to another. The new personality must be able | |
591 | * to handle the data in the current layout. | |
592 | * e.g. 2drive raid1 -> 2drive raid5 | |
593 | * ndrive raid5 -> degraded n+1drive raid6 with special layout | |
594 | * If the takeover succeeds, a new 'private' structure is returned. | |
595 | * This needs to be installed and then ->run used to activate the | |
596 | * array. | |
597 | */ | |
fd01b88c | 598 | void *(*takeover) (struct mddev *mddev); |
5c675f83 N |
599 | /* congested implements bdi.congested_fn(). |
600 | * Will not be called while array is 'suspended' */ | |
601 | int (*congested)(struct mddev *mddev, int bits); | |
ba903a3e AP |
602 | /* Changes the consistency policy of an active array. */ |
603 | int (*change_consistency_policy)(struct mddev *mddev, const char *buf); | |
1da177e4 LT |
604 | }; |
605 | ||
007583c9 N |
606 | struct md_sysfs_entry { |
607 | struct attribute attr; | |
fd01b88c N |
608 | ssize_t (*show)(struct mddev *, char *); |
609 | ssize_t (*store)(struct mddev *, const char *, size_t); | |
007583c9 | 610 | }; |
43a70507 | 611 | extern struct attribute_group md_bitmap_group; |
007583c9 | 612 | |
324a56e1 | 613 | static inline struct kernfs_node *sysfs_get_dirent_safe(struct kernfs_node *sd, char *name) |
00bcb4ac N |
614 | { |
615 | if (sd) | |
388975cc | 616 | return sysfs_get_dirent(sd, name); |
00bcb4ac N |
617 | return sd; |
618 | } | |
324a56e1 | 619 | static inline void sysfs_notify_dirent_safe(struct kernfs_node *sd) |
00bcb4ac N |
620 | { |
621 | if (sd) | |
622 | sysfs_notify_dirent(sd); | |
623 | } | |
624 | ||
fd01b88c | 625 | static inline char * mdname (struct mddev * mddev) |
1da177e4 LT |
626 | { |
627 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; | |
628 | } | |
629 | ||
fd01b88c | 630 | static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) |
36fad858 NK |
631 | { |
632 | char nm[20]; | |
9b15603d SL |
633 | if (!test_bit(Replacement, &rdev->flags) && |
634 | !test_bit(Journal, &rdev->flags) && | |
635 | mddev->kobj.sd) { | |
2d78f8c4 N |
636 | sprintf(nm, "rd%d", rdev->raid_disk); |
637 | return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
638 | } else | |
639 | return 0; | |
36fad858 NK |
640 | } |
641 | ||
fd01b88c | 642 | static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) |
36fad858 NK |
643 | { |
644 | char nm[20]; | |
9b15603d SL |
645 | if (!test_bit(Replacement, &rdev->flags) && |
646 | !test_bit(Journal, &rdev->flags) && | |
647 | mddev->kobj.sd) { | |
2d78f8c4 N |
648 | sprintf(nm, "rd%d", rdev->raid_disk); |
649 | sysfs_remove_link(&mddev->kobj, nm); | |
650 | } | |
36fad858 NK |
651 | } |
652 | ||
1da177e4 LT |
653 | /* |
654 | * iterates through some rdev ringlist. It's safe to remove the | |
655 | * current 'rdev'. Dont touch 'tmp' though. | |
656 | */ | |
159ec1fc CR |
657 | #define rdev_for_each_list(rdev, tmp, head) \ |
658 | list_for_each_entry_safe(rdev, tmp, head, same_set) | |
659 | ||
1da177e4 LT |
660 | /* |
661 | * iterates through the 'same array disks' ringlist | |
662 | */ | |
dafb20fa N |
663 | #define rdev_for_each(rdev, mddev) \ |
664 | list_for_each_entry(rdev, &((mddev)->disks), same_set) | |
665 | ||
666 | #define rdev_for_each_safe(rdev, tmp, mddev) \ | |
159ec1fc | 667 | list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) |
1da177e4 | 668 | |
4b80991c N |
669 | #define rdev_for_each_rcu(rdev, mddev) \ |
670 | list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) | |
671 | ||
2b8bf345 | 672 | struct md_thread { |
4ed8731d | 673 | void (*run) (struct md_thread *thread); |
fd01b88c | 674 | struct mddev *mddev; |
1da177e4 | 675 | wait_queue_head_t wqueue; |
f72ffdd6 | 676 | unsigned long flags; |
1da177e4 | 677 | struct task_struct *tsk; |
32a7627c | 678 | unsigned long timeout; |
4ed8731d | 679 | void *private; |
2b8bf345 | 680 | }; |
1da177e4 LT |
681 | |
682 | #define THREAD_WAKEUP 0 | |
683 | ||
1345b1d8 N |
684 | static inline void safe_put_page(struct page *p) |
685 | { | |
686 | if (p) put_page(p); | |
687 | } | |
688 | ||
84fc4b56 N |
689 | extern int register_md_personality(struct md_personality *p); |
690 | extern int unregister_md_personality(struct md_personality *p); | |
edb39c9d GR |
691 | extern int register_md_cluster_operations(struct md_cluster_operations *ops, |
692 | struct module *module); | |
693 | extern int unregister_md_cluster_operations(void); | |
694 | extern int md_setup_cluster(struct mddev *mddev, int nodes); | |
695 | extern void md_cluster_stop(struct mddev *mddev); | |
2b8bf345 | 696 | extern struct md_thread *md_register_thread( |
4ed8731d | 697 | void (*run)(struct md_thread *thread), |
2b8bf345 N |
698 | struct mddev *mddev, |
699 | const char *name); | |
700 | extern void md_unregister_thread(struct md_thread **threadp); | |
701 | extern void md_wakeup_thread(struct md_thread *thread); | |
fd01b88c | 702 | extern void md_check_recovery(struct mddev *mddev); |
a91d5ac0 | 703 | extern void md_reap_sync_thread(struct mddev *mddev); |
a415c0f1 | 704 | extern int mddev_init_writes_pending(struct mddev *mddev); |
cc27b0c7 | 705 | extern bool md_write_start(struct mddev *mddev, struct bio *bi); |
49728050 | 706 | extern void md_write_inc(struct mddev *mddev, struct bio *bi); |
fd01b88c N |
707 | extern void md_write_end(struct mddev *mddev); |
708 | extern void md_done_sync(struct mddev *mddev, int blocks, int ok); | |
709 | extern void md_error(struct mddev *mddev, struct md_rdev *rdev); | |
c6563a8c | 710 | extern void md_finish_reshape(struct mddev *mddev); |
fd01b88c N |
711 | |
712 | extern int mddev_congested(struct mddev *mddev, int bits); | |
775d7831 | 713 | extern bool __must_check md_flush_request(struct mddev *mddev, struct bio *bio); |
fd01b88c | 714 | extern void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
92022950 | 715 | sector_t sector, int size, struct page *page); |
46533ff7 | 716 | extern int md_super_wait(struct mddev *mddev); |
f72ffdd6 | 717 | extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
796a5cf0 MC |
718 | struct page *page, int op, int op_flags, |
719 | bool metadata_op); | |
4ed8731d | 720 | extern void md_do_sync(struct md_thread *thread); |
fd01b88c | 721 | extern void md_new_event(struct mddev *mddev); |
2214c260 | 722 | extern void md_allow_write(struct mddev *mddev); |
fd01b88c N |
723 | extern void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev); |
724 | extern void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors); | |
725 | extern int md_check_no_bitmap(struct mddev *mddev); | |
726 | extern int md_integrity_register(struct mddev *mddev); | |
1501efad | 727 | extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev); |
72e02075 | 728 | extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); |
63fe0817 | 729 | |
fd01b88c N |
730 | extern void mddev_init(struct mddev *mddev); |
731 | extern int md_run(struct mddev *mddev); | |
d5d885fd | 732 | extern int md_start(struct mddev *mddev); |
fd01b88c N |
733 | extern void md_stop(struct mddev *mddev); |
734 | extern void md_stop_writes(struct mddev *mddev); | |
3cb03002 | 735 | extern int md_rdev_init(struct md_rdev *rdev); |
545c8795 | 736 | extern void md_rdev_clear(struct md_rdev *rdev); |
63fe0817 | 737 | |
393debc2 | 738 | extern void md_handle_request(struct mddev *mddev, struct bio *bio); |
fd01b88c N |
739 | extern void mddev_suspend(struct mddev *mddev); |
740 | extern void mddev_resume(struct mddev *mddev); | |
a167f663 | 741 | extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 742 | struct mddev *mddev); |
9cbb1750 | 743 | |
70bcecdb | 744 | extern void md_reload_sb(struct mddev *mddev, int raid_disk); |
1aee41f6 | 745 | extern void md_update_sb(struct mddev *mddev, int force); |
fb56dfef | 746 | extern void md_kick_rdev_from_array(struct md_rdev * rdev); |
404659cf | 747 | extern void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev, |
11d3a9f6 | 748 | bool is_suspend); |
69b00b5b GJ |
749 | extern void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev, |
750 | bool is_suspend); | |
57d051dc | 751 | struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr); |
1532d9e8 | 752 | struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev); |
dfe15ac1 | 753 | |
62f7b198 GP |
754 | static inline bool is_mddev_broken(struct md_rdev *rdev, const char *md_type) |
755 | { | |
756 | int flags = rdev->bdev->bd_disk->flags; | |
757 | ||
758 | if (!(flags & GENHD_FL_UP)) { | |
759 | if (!test_and_set_bit(MD_BROKEN, &rdev->mddev->flags)) | |
760 | pr_warn("md: %s: %s array has a missing/failed member\n", | |
761 | mdname(rdev->mddev), md_type); | |
762 | return true; | |
763 | } | |
764 | return false; | |
765 | } | |
766 | ||
dfe15ac1 HR |
767 | static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) |
768 | { | |
769 | int faulty = test_bit(Faulty, &rdev->flags); | |
770 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) { | |
771 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
772 | md_wakeup_thread(mddev->thread); | |
773 | } | |
774 | } | |
775 | ||
edb39c9d | 776 | extern struct md_cluster_operations *md_cluster_ops; |
c4ce867f GR |
777 | static inline int mddev_is_clustered(struct mddev *mddev) |
778 | { | |
779 | return mddev->cluster_info && mddev->bitmap_info.nodes > 1; | |
780 | } | |
394ed8e4 SL |
781 | |
782 | /* clear unsupported mddev_flags */ | |
783 | static inline void mddev_clear_unsupported_flags(struct mddev *mddev, | |
784 | unsigned long unsupported_flags) | |
785 | { | |
786 | mddev->flags &= ~unsupported_flags; | |
787 | } | |
26483819 SL |
788 | |
789 | static inline void mddev_check_writesame(struct mddev *mddev, struct bio *bio) | |
790 | { | |
791 | if (bio_op(bio) == REQ_OP_WRITE_SAME && | |
74d46992 | 792 | !bio->bi_disk->queue->limits.max_write_same_sectors) |
26483819 SL |
793 | mddev->queue->limits.max_write_same_sectors = 0; |
794 | } | |
3deff1a7 CH |
795 | |
796 | static inline void mddev_check_write_zeroes(struct mddev *mddev, struct bio *bio) | |
797 | { | |
798 | if (bio_op(bio) == REQ_OP_WRITE_ZEROES && | |
74d46992 | 799 | !bio->bi_disk->queue->limits.max_write_zeroes_sectors) |
3deff1a7 CH |
800 | mddev->queue->limits.max_write_zeroes_sectors = 0; |
801 | } | |
63fe0817 | 802 | #endif /* _MD_MD_H */ |