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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 | ||
18 | #define MD_RESERVED 0UL | |
19 | #define LINEAR 1UL | |
20 | #define RAID0 2UL | |
21 | #define RAID1 3UL | |
22 | #define RAID5 4UL | |
23 | #define TRANSLUCENT 5UL | |
24 | #define HSM 6UL | |
25 | #define MULTIPATH 7UL | |
26 | #define RAID6 8UL | |
27 | #define RAID10 9UL | |
28 | #define FAULTY 10UL | |
29 | #define MAX_PERSONALITY 11UL | |
30 | ||
31 | #define LEVEL_MULTIPATH (-4) | |
32 | #define LEVEL_LINEAR (-1) | |
33 | #define LEVEL_FAULTY (-5) | |
34 | ||
35 | #define MaxSector (~(sector_t)0) | |
36 | #define MD_THREAD_NAME_MAX 14 | |
37 | ||
38 | static inline int pers_to_level (int pers) | |
39 | { | |
40 | switch (pers) { | |
41 | case FAULTY: return LEVEL_FAULTY; | |
42 | case MULTIPATH: return LEVEL_MULTIPATH; | |
43 | case HSM: return -3; | |
44 | case TRANSLUCENT: return -2; | |
45 | case LINEAR: return LEVEL_LINEAR; | |
46 | case RAID0: return 0; | |
47 | case RAID1: return 1; | |
48 | case RAID5: return 5; | |
49 | case RAID6: return 6; | |
50 | case RAID10: return 10; | |
51 | } | |
52 | BUG(); | |
53 | return MD_RESERVED; | |
54 | } | |
55 | ||
56 | static inline int level_to_pers (int level) | |
57 | { | |
58 | switch (level) { | |
59 | case LEVEL_FAULTY: return FAULTY; | |
60 | case LEVEL_MULTIPATH: return MULTIPATH; | |
61 | case -3: return HSM; | |
62 | case -2: return TRANSLUCENT; | |
63 | case LEVEL_LINEAR: return LINEAR; | |
64 | case 0: return RAID0; | |
65 | case 1: return RAID1; | |
66 | case 4: | |
67 | case 5: return RAID5; | |
68 | case 6: return RAID6; | |
69 | case 10: return RAID10; | |
70 | } | |
71 | return MD_RESERVED; | |
72 | } | |
73 | ||
74 | typedef struct mddev_s mddev_t; | |
75 | typedef struct mdk_rdev_s mdk_rdev_t; | |
76 | ||
77 | #define MAX_MD_DEVS 256 /* Max number of md dev */ | |
78 | ||
79 | /* | |
80 | * options passed in raidrun: | |
81 | */ | |
82 | ||
83 | #define MAX_CHUNK_SIZE (4096*1024) | |
84 | ||
85 | /* | |
86 | * default readahead | |
87 | */ | |
88 | ||
89 | static inline int disk_faulty(mdp_disk_t * d) | |
90 | { | |
91 | return d->state & (1 << MD_DISK_FAULTY); | |
92 | } | |
93 | ||
94 | static inline int disk_active(mdp_disk_t * d) | |
95 | { | |
96 | return d->state & (1 << MD_DISK_ACTIVE); | |
97 | } | |
98 | ||
99 | static inline int disk_sync(mdp_disk_t * d) | |
100 | { | |
101 | return d->state & (1 << MD_DISK_SYNC); | |
102 | } | |
103 | ||
104 | static inline int disk_spare(mdp_disk_t * d) | |
105 | { | |
106 | return !disk_sync(d) && !disk_active(d) && !disk_faulty(d); | |
107 | } | |
108 | ||
109 | static inline int disk_removed(mdp_disk_t * d) | |
110 | { | |
111 | return d->state & (1 << MD_DISK_REMOVED); | |
112 | } | |
113 | ||
114 | static inline void mark_disk_faulty(mdp_disk_t * d) | |
115 | { | |
116 | d->state |= (1 << MD_DISK_FAULTY); | |
117 | } | |
118 | ||
119 | static inline void mark_disk_active(mdp_disk_t * d) | |
120 | { | |
121 | d->state |= (1 << MD_DISK_ACTIVE); | |
122 | } | |
123 | ||
124 | static inline void mark_disk_sync(mdp_disk_t * d) | |
125 | { | |
126 | d->state |= (1 << MD_DISK_SYNC); | |
127 | } | |
128 | ||
129 | static inline void mark_disk_spare(mdp_disk_t * d) | |
130 | { | |
131 | d->state = 0; | |
132 | } | |
133 | ||
134 | static inline void mark_disk_removed(mdp_disk_t * d) | |
135 | { | |
136 | d->state = (1 << MD_DISK_FAULTY) | (1 << MD_DISK_REMOVED); | |
137 | } | |
138 | ||
139 | static inline void mark_disk_inactive(mdp_disk_t * d) | |
140 | { | |
141 | d->state &= ~(1 << MD_DISK_ACTIVE); | |
142 | } | |
143 | ||
144 | static inline void mark_disk_nonsync(mdp_disk_t * d) | |
145 | { | |
146 | d->state &= ~(1 << MD_DISK_SYNC); | |
147 | } | |
148 | ||
149 | /* | |
150 | * MD's 'extended' device | |
151 | */ | |
152 | struct mdk_rdev_s | |
153 | { | |
154 | struct list_head same_set; /* RAID devices within the same set */ | |
155 | ||
156 | sector_t size; /* Device size (in blocks) */ | |
157 | mddev_t *mddev; /* RAID array if running */ | |
158 | unsigned long last_events; /* IO event timestamp */ | |
159 | ||
160 | struct block_device *bdev; /* block device handle */ | |
161 | ||
162 | struct page *sb_page; | |
163 | int sb_loaded; | |
164 | sector_t data_offset; /* start of data in array */ | |
165 | sector_t sb_offset; | |
166 | int preferred_minor; /* autorun support */ | |
167 | ||
168 | /* A device can be in one of three states based on two flags: | |
169 | * Not working: faulty==1 in_sync==0 | |
170 | * Fully working: faulty==0 in_sync==1 | |
171 | * Working, but not | |
172 | * in sync with array | |
173 | * faulty==0 in_sync==0 | |
174 | * | |
175 | * It can never have faulty==1, in_sync==1 | |
176 | * This reduces the burden of testing multiple flags in many cases | |
177 | */ | |
178 | int faulty; /* if faulty do not issue IO requests */ | |
179 | int in_sync; /* device is a full member of the array */ | |
180 | ||
181 | int desc_nr; /* descriptor index in the superblock */ | |
182 | int raid_disk; /* role of device in array */ | |
183 | ||
184 | atomic_t nr_pending; /* number of pending requests. | |
185 | * only maintained for arrays that | |
186 | * support hot removal | |
187 | */ | |
188 | }; | |
189 | ||
190 | typedef struct mdk_personality_s mdk_personality_t; | |
191 | ||
192 | struct mddev_s | |
193 | { | |
194 | void *private; | |
195 | mdk_personality_t *pers; | |
196 | dev_t unit; | |
197 | int md_minor; | |
198 | struct list_head disks; | |
199 | int sb_dirty; | |
200 | int ro; | |
201 | ||
202 | struct gendisk *gendisk; | |
203 | ||
204 | /* Superblock information */ | |
205 | int major_version, | |
206 | minor_version, | |
207 | patch_version; | |
208 | int persistent; | |
209 | int chunk_size; | |
210 | time_t ctime, utime; | |
211 | int level, layout; | |
212 | int raid_disks; | |
213 | int max_disks; | |
214 | sector_t size; /* used size of component devices */ | |
215 | sector_t array_size; /* exported array size */ | |
216 | __u64 events; | |
217 | ||
218 | char uuid[16]; | |
219 | ||
220 | struct mdk_thread_s *thread; /* management thread */ | |
221 | struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */ | |
222 | sector_t curr_resync; /* blocks scheduled */ | |
223 | unsigned long resync_mark; /* a recent timestamp */ | |
224 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ | |
225 | ||
226 | sector_t resync_max_sectors; /* may be set by personality */ | |
227 | /* recovery/resync flags | |
228 | * NEEDED: we might need to start a resync/recover | |
229 | * RUNNING: a thread is running, or about to be started | |
230 | * SYNC: actually doing a resync, not a recovery | |
231 | * ERR: and IO error was detected - abort the resync/recovery | |
232 | * INTR: someone requested a (clean) early abort. | |
233 | * DONE: thread is done and is waiting to be reaped | |
234 | */ | |
235 | #define MD_RECOVERY_RUNNING 0 | |
236 | #define MD_RECOVERY_SYNC 1 | |
237 | #define MD_RECOVERY_ERR 2 | |
238 | #define MD_RECOVERY_INTR 3 | |
239 | #define MD_RECOVERY_DONE 4 | |
240 | #define MD_RECOVERY_NEEDED 5 | |
241 | unsigned long recovery; | |
242 | ||
243 | int in_sync; /* know to not need resync */ | |
244 | struct semaphore reconfig_sem; | |
245 | atomic_t active; | |
246 | ||
247 | int changed; /* true if we might need to reread partition info */ | |
248 | int degraded; /* whether md should consider | |
249 | * adding a spare | |
250 | */ | |
251 | ||
252 | atomic_t recovery_active; /* blocks scheduled, but not written */ | |
253 | wait_queue_head_t recovery_wait; | |
254 | sector_t recovery_cp; | |
255 | unsigned int safemode; /* if set, update "clean" superblock | |
256 | * when no writes pending. | |
257 | */ | |
258 | unsigned int safemode_delay; | |
259 | struct timer_list safemode_timer; | |
260 | atomic_t writes_pending; | |
261 | request_queue_t *queue; /* for plugging ... */ | |
262 | ||
263 | struct list_head all_mddevs; | |
264 | }; | |
265 | ||
266 | ||
267 | static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev) | |
268 | { | |
269 | int faulty = rdev->faulty; | |
270 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) | |
271 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
272 | } | |
273 | ||
274 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) | |
275 | { | |
276 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); | |
277 | } | |
278 | ||
279 | struct mdk_personality_s | |
280 | { | |
281 | char *name; | |
282 | struct module *owner; | |
283 | int (*make_request)(request_queue_t *q, struct bio *bio); | |
284 | int (*run)(mddev_t *mddev); | |
285 | int (*stop)(mddev_t *mddev); | |
286 | void (*status)(struct seq_file *seq, mddev_t *mddev); | |
287 | /* error_handler must set ->faulty and clear ->in_sync | |
288 | * if appropriate, and should abort recovery if needed | |
289 | */ | |
290 | void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev); | |
291 | int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev); | |
292 | int (*hot_remove_disk) (mddev_t *mddev, int number); | |
293 | int (*spare_active) (mddev_t *mddev); | |
294 | int (*sync_request)(mddev_t *mddev, sector_t sector_nr, int go_faster); | |
295 | int (*resize) (mddev_t *mddev, sector_t sectors); | |
296 | int (*reshape) (mddev_t *mddev, int raid_disks); | |
297 | int (*reconfig) (mddev_t *mddev, int layout, int chunk_size); | |
298 | }; | |
299 | ||
300 | ||
301 | static inline char * mdname (mddev_t * mddev) | |
302 | { | |
303 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; | |
304 | } | |
305 | ||
306 | extern mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr); | |
307 | ||
308 | /* | |
309 | * iterates through some rdev ringlist. It's safe to remove the | |
310 | * current 'rdev'. Dont touch 'tmp' though. | |
311 | */ | |
312 | #define ITERATE_RDEV_GENERIC(head,rdev,tmp) \ | |
313 | \ | |
314 | for ((tmp) = (head).next; \ | |
315 | (rdev) = (list_entry((tmp), mdk_rdev_t, same_set)), \ | |
316 | (tmp) = (tmp)->next, (tmp)->prev != &(head) \ | |
317 | ; ) | |
318 | /* | |
319 | * iterates through the 'same array disks' ringlist | |
320 | */ | |
321 | #define ITERATE_RDEV(mddev,rdev,tmp) \ | |
322 | ITERATE_RDEV_GENERIC((mddev)->disks,rdev,tmp) | |
323 | ||
324 | /* | |
325 | * Iterates through 'pending RAID disks' | |
326 | */ | |
327 | #define ITERATE_RDEV_PENDING(rdev,tmp) \ | |
328 | ITERATE_RDEV_GENERIC(pending_raid_disks,rdev,tmp) | |
329 | ||
330 | typedef struct mdk_thread_s { | |
331 | void (*run) (mddev_t *mddev); | |
332 | mddev_t *mddev; | |
333 | wait_queue_head_t wqueue; | |
334 | unsigned long flags; | |
335 | struct completion *event; | |
336 | struct task_struct *tsk; | |
337 | const char *name; | |
338 | } mdk_thread_t; | |
339 | ||
340 | #define THREAD_WAKEUP 0 | |
341 | ||
342 | #define __wait_event_lock_irq(wq, condition, lock, cmd) \ | |
343 | do { \ | |
344 | wait_queue_t __wait; \ | |
345 | init_waitqueue_entry(&__wait, current); \ | |
346 | \ | |
347 | add_wait_queue(&wq, &__wait); \ | |
348 | for (;;) { \ | |
349 | set_current_state(TASK_UNINTERRUPTIBLE); \ | |
350 | if (condition) \ | |
351 | break; \ | |
352 | spin_unlock_irq(&lock); \ | |
353 | cmd; \ | |
354 | schedule(); \ | |
355 | spin_lock_irq(&lock); \ | |
356 | } \ | |
357 | current->state = TASK_RUNNING; \ | |
358 | remove_wait_queue(&wq, &__wait); \ | |
359 | } while (0) | |
360 | ||
361 | #define wait_event_lock_irq(wq, condition, lock, cmd) \ | |
362 | do { \ | |
363 | if (condition) \ | |
364 | break; \ | |
365 | __wait_event_lock_irq(wq, condition, lock, cmd); \ | |
366 | } while (0) | |
367 | ||
368 | #endif | |
369 |