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1da177e4 LT |
1 | /* |
2 | md_k.h : kernel internal structure of the Linux MD driver | |
3 | Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2, or (at your option) | |
8 | any later version. | |
9 | ||
10 | You should have received a copy of the GNU General Public License | |
11 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
12 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
13 | */ | |
14 | ||
15 | #ifndef _MD_K_H | |
16 | #define _MD_K_H | |
17 | ||
06d91a5f N |
18 | /* and dm-bio-list.h is not under include/linux because.... ??? */ |
19 | #include "../../../drivers/md/dm-bio-list.h" | |
20 | ||
1da177e4 LT |
21 | #define MD_RESERVED 0UL |
22 | #define LINEAR 1UL | |
23 | #define RAID0 2UL | |
24 | #define RAID1 3UL | |
25 | #define RAID5 4UL | |
26 | #define TRANSLUCENT 5UL | |
27 | #define HSM 6UL | |
28 | #define MULTIPATH 7UL | |
29 | #define RAID6 8UL | |
30 | #define RAID10 9UL | |
31 | #define FAULTY 10UL | |
32 | #define MAX_PERSONALITY 11UL | |
33 | ||
34 | #define LEVEL_MULTIPATH (-4) | |
35 | #define LEVEL_LINEAR (-1) | |
36 | #define LEVEL_FAULTY (-5) | |
37 | ||
38 | #define MaxSector (~(sector_t)0) | |
39 | #define MD_THREAD_NAME_MAX 14 | |
40 | ||
41 | static inline int pers_to_level (int pers) | |
42 | { | |
43 | switch (pers) { | |
44 | case FAULTY: return LEVEL_FAULTY; | |
45 | case MULTIPATH: return LEVEL_MULTIPATH; | |
46 | case HSM: return -3; | |
47 | case TRANSLUCENT: return -2; | |
48 | case LINEAR: return LEVEL_LINEAR; | |
49 | case RAID0: return 0; | |
50 | case RAID1: return 1; | |
51 | case RAID5: return 5; | |
52 | case RAID6: return 6; | |
53 | case RAID10: return 10; | |
54 | } | |
55 | BUG(); | |
56 | return MD_RESERVED; | |
57 | } | |
58 | ||
59 | static inline int level_to_pers (int level) | |
60 | { | |
61 | switch (level) { | |
62 | case LEVEL_FAULTY: return FAULTY; | |
63 | case LEVEL_MULTIPATH: return MULTIPATH; | |
64 | case -3: return HSM; | |
65 | case -2: return TRANSLUCENT; | |
66 | case LEVEL_LINEAR: return LINEAR; | |
67 | case 0: return RAID0; | |
68 | case 1: return RAID1; | |
69 | case 4: | |
70 | case 5: return RAID5; | |
71 | case 6: return RAID6; | |
72 | case 10: return RAID10; | |
73 | } | |
74 | return MD_RESERVED; | |
75 | } | |
76 | ||
77 | typedef struct mddev_s mddev_t; | |
78 | typedef struct mdk_rdev_s mdk_rdev_t; | |
79 | ||
80 | #define MAX_MD_DEVS 256 /* Max number of md dev */ | |
81 | ||
82 | /* | |
83 | * options passed in raidrun: | |
84 | */ | |
85 | ||
86 | #define MAX_CHUNK_SIZE (4096*1024) | |
87 | ||
1da177e4 LT |
88 | /* |
89 | * MD's 'extended' device | |
90 | */ | |
91 | struct mdk_rdev_s | |
92 | { | |
93 | struct list_head same_set; /* RAID devices within the same set */ | |
94 | ||
95 | sector_t size; /* Device size (in blocks) */ | |
96 | mddev_t *mddev; /* RAID array if running */ | |
97 | unsigned long last_events; /* IO event timestamp */ | |
98 | ||
99 | struct block_device *bdev; /* block device handle */ | |
100 | ||
101 | struct page *sb_page; | |
102 | int sb_loaded; | |
103 | sector_t data_offset; /* start of data in array */ | |
104 | sector_t sb_offset; | |
0002b271 | 105 | int sb_size; /* bytes in the superblock */ |
1da177e4 LT |
106 | int preferred_minor; /* autorun support */ |
107 | ||
86e6ffdd N |
108 | struct kobject kobj; |
109 | ||
1da177e4 LT |
110 | /* A device can be in one of three states based on two flags: |
111 | * Not working: faulty==1 in_sync==0 | |
112 | * Fully working: faulty==0 in_sync==1 | |
113 | * Working, but not | |
114 | * in sync with array | |
115 | * faulty==0 in_sync==0 | |
116 | * | |
117 | * It can never have faulty==1, in_sync==1 | |
118 | * This reduces the burden of testing multiple flags in many cases | |
119 | */ | |
1da177e4 | 120 | |
b2d444d7 N |
121 | unsigned long flags; |
122 | #define Faulty 1 /* device is known to have a fault */ | |
123 | #define In_sync 2 /* device is in_sync with rest of array */ | |
8ddf9efe | 124 | #define WriteMostly 4 /* Avoid reading if at all possible */ |
a9701a30 | 125 | #define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */ |
8ddf9efe | 126 | |
1da177e4 LT |
127 | int desc_nr; /* descriptor index in the superblock */ |
128 | int raid_disk; /* role of device in array */ | |
41158c7e N |
129 | int saved_raid_disk; /* role that device used to have in the |
130 | * array and could again if we did a partial | |
131 | * resync from the bitmap | |
132 | */ | |
1da177e4 LT |
133 | |
134 | atomic_t nr_pending; /* number of pending requests. | |
135 | * only maintained for arrays that | |
136 | * support hot removal | |
137 | */ | |
ba22dcbf N |
138 | atomic_t read_errors; /* number of consecutive read errors that |
139 | * we have tried to ignore. | |
140 | */ | |
1da177e4 LT |
141 | }; |
142 | ||
143 | typedef struct mdk_personality_s mdk_personality_t; | |
144 | ||
145 | struct mddev_s | |
146 | { | |
147 | void *private; | |
148 | mdk_personality_t *pers; | |
149 | dev_t unit; | |
150 | int md_minor; | |
151 | struct list_head disks; | |
152 | int sb_dirty; | |
153 | int ro; | |
154 | ||
155 | struct gendisk *gendisk; | |
156 | ||
eae1701f N |
157 | struct kobject kobj; |
158 | ||
1da177e4 LT |
159 | /* Superblock information */ |
160 | int major_version, | |
161 | minor_version, | |
162 | patch_version; | |
163 | int persistent; | |
164 | int chunk_size; | |
165 | time_t ctime, utime; | |
166 | int level, layout; | |
167 | int raid_disks; | |
168 | int max_disks; | |
169 | sector_t size; /* used size of component devices */ | |
170 | sector_t array_size; /* exported array size */ | |
171 | __u64 events; | |
172 | ||
173 | char uuid[16]; | |
174 | ||
175 | struct mdk_thread_s *thread; /* management thread */ | |
176 | struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */ | |
177 | sector_t curr_resync; /* blocks scheduled */ | |
178 | unsigned long resync_mark; /* a recent timestamp */ | |
179 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ | |
180 | ||
181 | sector_t resync_max_sectors; /* may be set by personality */ | |
9d88883e N |
182 | |
183 | sector_t resync_mismatches; /* count of sectors where | |
184 | * parity/replica mismatch found | |
185 | */ | |
6ff8d8ec | 186 | int ok_start_degraded; |
1da177e4 LT |
187 | /* recovery/resync flags |
188 | * NEEDED: we might need to start a resync/recover | |
189 | * RUNNING: a thread is running, or about to be started | |
190 | * SYNC: actually doing a resync, not a recovery | |
191 | * ERR: and IO error was detected - abort the resync/recovery | |
192 | * INTR: someone requested a (clean) early abort. | |
193 | * DONE: thread is done and is waiting to be reaped | |
24dd469d N |
194 | * REQUEST: user-space has requested a sync (used with SYNC) |
195 | * CHECK: user-space request for for check-only, no repair | |
1da177e4 LT |
196 | */ |
197 | #define MD_RECOVERY_RUNNING 0 | |
198 | #define MD_RECOVERY_SYNC 1 | |
199 | #define MD_RECOVERY_ERR 2 | |
200 | #define MD_RECOVERY_INTR 3 | |
201 | #define MD_RECOVERY_DONE 4 | |
202 | #define MD_RECOVERY_NEEDED 5 | |
24dd469d N |
203 | #define MD_RECOVERY_REQUESTED 6 |
204 | #define MD_RECOVERY_CHECK 7 | |
1da177e4 LT |
205 | unsigned long recovery; |
206 | ||
207 | int in_sync; /* know to not need resync */ | |
208 | struct semaphore reconfig_sem; | |
209 | atomic_t active; | |
210 | ||
211 | int changed; /* true if we might need to reread partition info */ | |
212 | int degraded; /* whether md should consider | |
213 | * adding a spare | |
214 | */ | |
a9701a30 N |
215 | int barriers_work; /* initialised to true, cleared as soon |
216 | * as a barrier request to slave | |
217 | * fails. Only supported | |
218 | */ | |
219 | struct bio *biolist; /* bios that need to be retried | |
220 | * because BIO_RW_BARRIER is not supported | |
221 | */ | |
1da177e4 LT |
222 | |
223 | atomic_t recovery_active; /* blocks scheduled, but not written */ | |
224 | wait_queue_head_t recovery_wait; | |
225 | sector_t recovery_cp; | |
06d91a5f N |
226 | |
227 | spinlock_t write_lock; | |
3d310eb7 | 228 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
7bfa19f2 | 229 | atomic_t pending_writes; /* number of active superblock writes */ |
06d91a5f | 230 | |
1da177e4 LT |
231 | unsigned int safemode; /* if set, update "clean" superblock |
232 | * when no writes pending. | |
233 | */ | |
234 | unsigned int safemode_delay; | |
235 | struct timer_list safemode_timer; | |
236 | atomic_t writes_pending; | |
237 | request_queue_t *queue; /* for plugging ... */ | |
238 | ||
4b6d287f N |
239 | atomic_t write_behind; /* outstanding async IO */ |
240 | unsigned int max_write_behind; /* 0 = sync */ | |
241 | ||
32a7627c N |
242 | struct bitmap *bitmap; /* the bitmap for the device */ |
243 | struct file *bitmap_file; /* the bitmap file */ | |
a654b9d8 N |
244 | long bitmap_offset; /* offset from superblock of |
245 | * start of bitmap. May be | |
246 | * negative, but not '0' | |
247 | */ | |
36fa3063 N |
248 | long default_bitmap_offset; /* this is the offset to use when |
249 | * hot-adding a bitmap. It should | |
250 | * eventually be settable by sysfs. | |
251 | */ | |
32a7627c | 252 | |
1da177e4 LT |
253 | struct list_head all_mddevs; |
254 | }; | |
255 | ||
256 | ||
257 | static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev) | |
258 | { | |
b2d444d7 | 259 | int faulty = test_bit(Faulty, &rdev->flags); |
1da177e4 LT |
260 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) |
261 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
262 | } | |
263 | ||
264 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) | |
265 | { | |
266 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); | |
267 | } | |
268 | ||
269 | struct mdk_personality_s | |
270 | { | |
271 | char *name; | |
272 | struct module *owner; | |
273 | int (*make_request)(request_queue_t *q, struct bio *bio); | |
274 | int (*run)(mddev_t *mddev); | |
275 | int (*stop)(mddev_t *mddev); | |
276 | void (*status)(struct seq_file *seq, mddev_t *mddev); | |
277 | /* error_handler must set ->faulty and clear ->in_sync | |
278 | * if appropriate, and should abort recovery if needed | |
279 | */ | |
280 | void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev); | |
281 | int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev); | |
282 | int (*hot_remove_disk) (mddev_t *mddev, int number); | |
283 | int (*spare_active) (mddev_t *mddev); | |
57afd89f | 284 | sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster); |
1da177e4 LT |
285 | int (*resize) (mddev_t *mddev, sector_t sectors); |
286 | int (*reshape) (mddev_t *mddev, int raid_disks); | |
287 | int (*reconfig) (mddev_t *mddev, int layout, int chunk_size); | |
36fa3063 N |
288 | /* quiesce moves between quiescence states |
289 | * 0 - fully active | |
290 | * 1 - no new requests allowed | |
291 | * others - reserved | |
292 | */ | |
293 | void (*quiesce) (mddev_t *mddev, int state); | |
1da177e4 LT |
294 | }; |
295 | ||
296 | ||
007583c9 N |
297 | struct md_sysfs_entry { |
298 | struct attribute attr; | |
299 | ssize_t (*show)(mddev_t *, char *); | |
300 | ssize_t (*store)(mddev_t *, const char *, size_t); | |
301 | }; | |
302 | ||
303 | ||
1da177e4 LT |
304 | static inline char * mdname (mddev_t * mddev) |
305 | { | |
306 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; | |
307 | } | |
308 | ||
309 | extern mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr); | |
310 | ||
311 | /* | |
312 | * iterates through some rdev ringlist. It's safe to remove the | |
313 | * current 'rdev'. Dont touch 'tmp' though. | |
314 | */ | |
315 | #define ITERATE_RDEV_GENERIC(head,rdev,tmp) \ | |
316 | \ | |
317 | for ((tmp) = (head).next; \ | |
318 | (rdev) = (list_entry((tmp), mdk_rdev_t, same_set)), \ | |
319 | (tmp) = (tmp)->next, (tmp)->prev != &(head) \ | |
320 | ; ) | |
321 | /* | |
322 | * iterates through the 'same array disks' ringlist | |
323 | */ | |
324 | #define ITERATE_RDEV(mddev,rdev,tmp) \ | |
325 | ITERATE_RDEV_GENERIC((mddev)->disks,rdev,tmp) | |
326 | ||
327 | /* | |
328 | * Iterates through 'pending RAID disks' | |
329 | */ | |
330 | #define ITERATE_RDEV_PENDING(rdev,tmp) \ | |
331 | ITERATE_RDEV_GENERIC(pending_raid_disks,rdev,tmp) | |
332 | ||
333 | typedef struct mdk_thread_s { | |
334 | void (*run) (mddev_t *mddev); | |
335 | mddev_t *mddev; | |
336 | wait_queue_head_t wqueue; | |
337 | unsigned long flags; | |
1da177e4 | 338 | struct task_struct *tsk; |
32a7627c | 339 | unsigned long timeout; |
1da177e4 LT |
340 | } mdk_thread_t; |
341 | ||
342 | #define THREAD_WAKEUP 0 | |
343 | ||
344 | #define __wait_event_lock_irq(wq, condition, lock, cmd) \ | |
345 | do { \ | |
346 | wait_queue_t __wait; \ | |
347 | init_waitqueue_entry(&__wait, current); \ | |
348 | \ | |
349 | add_wait_queue(&wq, &__wait); \ | |
350 | for (;;) { \ | |
351 | set_current_state(TASK_UNINTERRUPTIBLE); \ | |
352 | if (condition) \ | |
353 | break; \ | |
354 | spin_unlock_irq(&lock); \ | |
355 | cmd; \ | |
356 | schedule(); \ | |
357 | spin_lock_irq(&lock); \ | |
358 | } \ | |
359 | current->state = TASK_RUNNING; \ | |
360 | remove_wait_queue(&wq, &__wait); \ | |
361 | } while (0) | |
362 | ||
363 | #define wait_event_lock_irq(wq, condition, lock, cmd) \ | |
364 | do { \ | |
365 | if (condition) \ | |
366 | break; \ | |
367 | __wait_event_lock_irq(wq, condition, lock, cmd); \ | |
368 | } while (0) | |
369 | ||
370 | #endif | |
371 |