Commit | Line | Data |
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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 LEVEL_MULTIPATH (-4) |
22 | #define LEVEL_LINEAR (-1) | |
23 | #define LEVEL_FAULTY (-5) | |
24 | ||
2604b703 N |
25 | /* we need a value for 'no level specified' and 0 |
26 | * means 'raid0', so we need something else. This is | |
27 | * for internal use only | |
28 | */ | |
29 | #define LEVEL_NONE (-1000000) | |
30 | ||
1da177e4 LT |
31 | #define MaxSector (~(sector_t)0) |
32 | #define MD_THREAD_NAME_MAX 14 | |
33 | ||
1da177e4 LT |
34 | typedef struct mddev_s mddev_t; |
35 | typedef struct mdk_rdev_s mdk_rdev_t; | |
36 | ||
37 | #define MAX_MD_DEVS 256 /* Max number of md dev */ | |
38 | ||
39 | /* | |
40 | * options passed in raidrun: | |
41 | */ | |
42 | ||
43 | #define MAX_CHUNK_SIZE (4096*1024) | |
44 | ||
1da177e4 LT |
45 | /* |
46 | * MD's 'extended' device | |
47 | */ | |
48 | struct mdk_rdev_s | |
49 | { | |
50 | struct list_head same_set; /* RAID devices within the same set */ | |
51 | ||
52 | sector_t size; /* Device size (in blocks) */ | |
53 | mddev_t *mddev; /* RAID array if running */ | |
54 | unsigned long last_events; /* IO event timestamp */ | |
55 | ||
56 | struct block_device *bdev; /* block device handle */ | |
57 | ||
58 | struct page *sb_page; | |
59 | int sb_loaded; | |
60 | sector_t data_offset; /* start of data in array */ | |
61 | sector_t sb_offset; | |
0002b271 | 62 | int sb_size; /* bytes in the superblock */ |
1da177e4 LT |
63 | int preferred_minor; /* autorun support */ |
64 | ||
86e6ffdd N |
65 | struct kobject kobj; |
66 | ||
1da177e4 LT |
67 | /* A device can be in one of three states based on two flags: |
68 | * Not working: faulty==1 in_sync==0 | |
69 | * Fully working: faulty==0 in_sync==1 | |
70 | * Working, but not | |
71 | * in sync with array | |
72 | * faulty==0 in_sync==0 | |
73 | * | |
74 | * It can never have faulty==1, in_sync==1 | |
75 | * This reduces the burden of testing multiple flags in many cases | |
76 | */ | |
1da177e4 | 77 | |
b2d444d7 N |
78 | unsigned long flags; |
79 | #define Faulty 1 /* device is known to have a fault */ | |
80 | #define In_sync 2 /* device is in_sync with rest of array */ | |
8ddf9efe | 81 | #define WriteMostly 4 /* Avoid reading if at all possible */ |
a9701a30 | 82 | #define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */ |
8ddf9efe | 83 | |
1da177e4 LT |
84 | int desc_nr; /* descriptor index in the superblock */ |
85 | int raid_disk; /* role of device in array */ | |
41158c7e N |
86 | int saved_raid_disk; /* role that device used to have in the |
87 | * array and could again if we did a partial | |
88 | * resync from the bitmap | |
89 | */ | |
1da177e4 LT |
90 | |
91 | atomic_t nr_pending; /* number of pending requests. | |
92 | * only maintained for arrays that | |
93 | * support hot removal | |
94 | */ | |
ba22dcbf N |
95 | atomic_t read_errors; /* number of consecutive read errors that |
96 | * we have tried to ignore. | |
97 | */ | |
4dbcdc75 N |
98 | atomic_t corrected_errors; /* number of corrected read errors, |
99 | * for reporting to userspace and storing | |
100 | * in superblock. | |
101 | */ | |
1da177e4 LT |
102 | }; |
103 | ||
1da177e4 LT |
104 | struct mddev_s |
105 | { | |
106 | void *private; | |
2604b703 | 107 | struct mdk_personality *pers; |
1da177e4 LT |
108 | dev_t unit; |
109 | int md_minor; | |
110 | struct list_head disks; | |
111 | int sb_dirty; | |
112 | int ro; | |
113 | ||
114 | struct gendisk *gendisk; | |
115 | ||
eae1701f N |
116 | struct kobject kobj; |
117 | ||
1da177e4 LT |
118 | /* Superblock information */ |
119 | int major_version, | |
120 | minor_version, | |
121 | patch_version; | |
122 | int persistent; | |
123 | int chunk_size; | |
124 | time_t ctime, utime; | |
125 | int level, layout; | |
d9d166c2 | 126 | char clevel[16]; |
1da177e4 LT |
127 | int raid_disks; |
128 | int max_disks; | |
129 | sector_t size; /* used size of component devices */ | |
130 | sector_t array_size; /* exported array size */ | |
131 | __u64 events; | |
132 | ||
133 | char uuid[16]; | |
134 | ||
135 | struct mdk_thread_s *thread; /* management thread */ | |
136 | struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */ | |
137 | sector_t curr_resync; /* blocks scheduled */ | |
138 | unsigned long resync_mark; /* a recent timestamp */ | |
139 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ | |
140 | ||
141 | sector_t resync_max_sectors; /* may be set by personality */ | |
9d88883e N |
142 | |
143 | sector_t resync_mismatches; /* count of sectors where | |
144 | * parity/replica mismatch found | |
145 | */ | |
88202a0c N |
146 | /* if zero, use the system-wide default */ |
147 | int sync_speed_min; | |
148 | int sync_speed_max; | |
149 | ||
6ff8d8ec | 150 | int ok_start_degraded; |
1da177e4 LT |
151 | /* recovery/resync flags |
152 | * NEEDED: we might need to start a resync/recover | |
153 | * RUNNING: a thread is running, or about to be started | |
154 | * SYNC: actually doing a resync, not a recovery | |
155 | * ERR: and IO error was detected - abort the resync/recovery | |
156 | * INTR: someone requested a (clean) early abort. | |
157 | * DONE: thread is done and is waiting to be reaped | |
24dd469d N |
158 | * REQUEST: user-space has requested a sync (used with SYNC) |
159 | * CHECK: user-space request for for check-only, no repair | |
1da177e4 LT |
160 | */ |
161 | #define MD_RECOVERY_RUNNING 0 | |
162 | #define MD_RECOVERY_SYNC 1 | |
163 | #define MD_RECOVERY_ERR 2 | |
164 | #define MD_RECOVERY_INTR 3 | |
165 | #define MD_RECOVERY_DONE 4 | |
166 | #define MD_RECOVERY_NEEDED 5 | |
24dd469d N |
167 | #define MD_RECOVERY_REQUESTED 6 |
168 | #define MD_RECOVERY_CHECK 7 | |
1da177e4 LT |
169 | unsigned long recovery; |
170 | ||
171 | int in_sync; /* know to not need resync */ | |
172 | struct semaphore reconfig_sem; | |
173 | atomic_t active; | |
174 | ||
175 | int changed; /* true if we might need to reread partition info */ | |
176 | int degraded; /* whether md should consider | |
177 | * adding a spare | |
178 | */ | |
a9701a30 N |
179 | int barriers_work; /* initialised to true, cleared as soon |
180 | * as a barrier request to slave | |
181 | * fails. Only supported | |
182 | */ | |
183 | struct bio *biolist; /* bios that need to be retried | |
184 | * because BIO_RW_BARRIER is not supported | |
185 | */ | |
1da177e4 LT |
186 | |
187 | atomic_t recovery_active; /* blocks scheduled, but not written */ | |
188 | wait_queue_head_t recovery_wait; | |
189 | sector_t recovery_cp; | |
06d91a5f N |
190 | |
191 | spinlock_t write_lock; | |
3d310eb7 | 192 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
7bfa19f2 | 193 | atomic_t pending_writes; /* number of active superblock writes */ |
06d91a5f | 194 | |
1da177e4 LT |
195 | unsigned int safemode; /* if set, update "clean" superblock |
196 | * when no writes pending. | |
197 | */ | |
198 | unsigned int safemode_delay; | |
199 | struct timer_list safemode_timer; | |
200 | atomic_t writes_pending; | |
201 | request_queue_t *queue; /* for plugging ... */ | |
202 | ||
4b6d287f N |
203 | atomic_t write_behind; /* outstanding async IO */ |
204 | unsigned int max_write_behind; /* 0 = sync */ | |
205 | ||
32a7627c N |
206 | struct bitmap *bitmap; /* the bitmap for the device */ |
207 | struct file *bitmap_file; /* the bitmap file */ | |
a654b9d8 N |
208 | long bitmap_offset; /* offset from superblock of |
209 | * start of bitmap. May be | |
210 | * negative, but not '0' | |
211 | */ | |
36fa3063 N |
212 | long default_bitmap_offset; /* this is the offset to use when |
213 | * hot-adding a bitmap. It should | |
214 | * eventually be settable by sysfs. | |
215 | */ | |
32a7627c | 216 | |
1da177e4 LT |
217 | struct list_head all_mddevs; |
218 | }; | |
219 | ||
220 | ||
221 | static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev) | |
222 | { | |
b2d444d7 | 223 | int faulty = test_bit(Faulty, &rdev->flags); |
1da177e4 LT |
224 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) |
225 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
226 | } | |
227 | ||
228 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) | |
229 | { | |
230 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); | |
231 | } | |
232 | ||
2604b703 | 233 | struct mdk_personality |
1da177e4 LT |
234 | { |
235 | char *name; | |
2604b703 N |
236 | int level; |
237 | struct list_head list; | |
1da177e4 LT |
238 | struct module *owner; |
239 | int (*make_request)(request_queue_t *q, struct bio *bio); | |
240 | int (*run)(mddev_t *mddev); | |
241 | int (*stop)(mddev_t *mddev); | |
242 | void (*status)(struct seq_file *seq, mddev_t *mddev); | |
243 | /* error_handler must set ->faulty and clear ->in_sync | |
244 | * if appropriate, and should abort recovery if needed | |
245 | */ | |
246 | void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev); | |
247 | int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev); | |
248 | int (*hot_remove_disk) (mddev_t *mddev, int number); | |
249 | int (*spare_active) (mddev_t *mddev); | |
57afd89f | 250 | sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster); |
1da177e4 LT |
251 | int (*resize) (mddev_t *mddev, sector_t sectors); |
252 | int (*reshape) (mddev_t *mddev, int raid_disks); | |
253 | int (*reconfig) (mddev_t *mddev, int layout, int chunk_size); | |
36fa3063 N |
254 | /* quiesce moves between quiescence states |
255 | * 0 - fully active | |
256 | * 1 - no new requests allowed | |
257 | * others - reserved | |
258 | */ | |
259 | void (*quiesce) (mddev_t *mddev, int state); | |
1da177e4 LT |
260 | }; |
261 | ||
262 | ||
007583c9 N |
263 | struct md_sysfs_entry { |
264 | struct attribute attr; | |
265 | ssize_t (*show)(mddev_t *, char *); | |
266 | ssize_t (*store)(mddev_t *, const char *, size_t); | |
267 | }; | |
268 | ||
269 | ||
1da177e4 LT |
270 | static inline char * mdname (mddev_t * mddev) |
271 | { | |
272 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; | |
273 | } | |
274 | ||
1da177e4 LT |
275 | /* |
276 | * iterates through some rdev ringlist. It's safe to remove the | |
277 | * current 'rdev'. Dont touch 'tmp' though. | |
278 | */ | |
279 | #define ITERATE_RDEV_GENERIC(head,rdev,tmp) \ | |
280 | \ | |
281 | for ((tmp) = (head).next; \ | |
282 | (rdev) = (list_entry((tmp), mdk_rdev_t, same_set)), \ | |
283 | (tmp) = (tmp)->next, (tmp)->prev != &(head) \ | |
284 | ; ) | |
285 | /* | |
286 | * iterates through the 'same array disks' ringlist | |
287 | */ | |
288 | #define ITERATE_RDEV(mddev,rdev,tmp) \ | |
289 | ITERATE_RDEV_GENERIC((mddev)->disks,rdev,tmp) | |
290 | ||
291 | /* | |
292 | * Iterates through 'pending RAID disks' | |
293 | */ | |
294 | #define ITERATE_RDEV_PENDING(rdev,tmp) \ | |
295 | ITERATE_RDEV_GENERIC(pending_raid_disks,rdev,tmp) | |
296 | ||
297 | typedef struct mdk_thread_s { | |
298 | void (*run) (mddev_t *mddev); | |
299 | mddev_t *mddev; | |
300 | wait_queue_head_t wqueue; | |
301 | unsigned long flags; | |
1da177e4 | 302 | struct task_struct *tsk; |
32a7627c | 303 | unsigned long timeout; |
1da177e4 LT |
304 | } mdk_thread_t; |
305 | ||
306 | #define THREAD_WAKEUP 0 | |
307 | ||
308 | #define __wait_event_lock_irq(wq, condition, lock, cmd) \ | |
309 | do { \ | |
310 | wait_queue_t __wait; \ | |
311 | init_waitqueue_entry(&__wait, current); \ | |
312 | \ | |
313 | add_wait_queue(&wq, &__wait); \ | |
314 | for (;;) { \ | |
315 | set_current_state(TASK_UNINTERRUPTIBLE); \ | |
316 | if (condition) \ | |
317 | break; \ | |
318 | spin_unlock_irq(&lock); \ | |
319 | cmd; \ | |
320 | schedule(); \ | |
321 | spin_lock_irq(&lock); \ | |
322 | } \ | |
323 | current->state = TASK_RUNNING; \ | |
324 | remove_wait_queue(&wq, &__wait); \ | |
325 | } while (0) | |
326 | ||
327 | #define wait_event_lock_irq(wq, condition, lock, cmd) \ | |
328 | do { \ | |
329 | if (condition) \ | |
330 | break; \ | |
331 | __wait_event_lock_irq(wq, condition, lock, cmd); \ | |
332 | } while (0) | |
333 | ||
1345b1d8 N |
334 | static inline void safe_put_page(struct page *p) |
335 | { | |
336 | if (p) put_page(p); | |
337 | } | |
338 | ||
1da177e4 LT |
339 | #endif |
340 |