Commit | Line | Data |
---|---|---|
8e854e9c GR |
1 | /* |
2 | * Copyright (C) 2015, SUSE | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2, or (at your option) | |
7 | * any later version. | |
8 | * | |
9 | */ | |
10 | ||
11 | ||
12 | #include <linux/module.h> | |
47741b7c GR |
13 | #include <linux/dlm.h> |
14 | #include <linux/sched.h> | |
1aee41f6 | 15 | #include <linux/raid/md_p.h> |
47741b7c | 16 | #include "md.h" |
e94987db | 17 | #include "bitmap.h" |
edb39c9d | 18 | #include "md-cluster.h" |
47741b7c GR |
19 | |
20 | #define LVB_SIZE 64 | |
1aee41f6 | 21 | #define NEW_DEV_TIMEOUT 5000 |
47741b7c GR |
22 | |
23 | struct dlm_lock_resource { | |
24 | dlm_lockspace_t *ls; | |
25 | struct dlm_lksb lksb; | |
26 | char *name; /* lock name. */ | |
27 | uint32_t flags; /* flags to pass to dlm_lock() */ | |
47741b7c | 28 | struct completion completion; /* completion for synchronized locking */ |
c4ce867f GR |
29 | void (*bast)(void *arg, int mode); /* blocking AST function pointer*/ |
30 | struct mddev *mddev; /* pointing back to mddev. */ | |
dbb64f86 | 31 | int mode; |
c4ce867f GR |
32 | }; |
33 | ||
96ae923a GR |
34 | struct suspend_info { |
35 | int slot; | |
36 | sector_t lo; | |
37 | sector_t hi; | |
38 | struct list_head list; | |
39 | }; | |
40 | ||
41 | struct resync_info { | |
42 | __le64 lo; | |
43 | __le64 hi; | |
44 | }; | |
45 | ||
fa8259da GR |
46 | /* md_cluster_info flags */ |
47 | #define MD_CLUSTER_WAITING_FOR_NEWDISK 1 | |
90382ed9 | 48 | #define MD_CLUSTER_SUSPEND_READ_BALANCING 2 |
eece075c | 49 | #define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3 |
fa8259da | 50 | |
8b9277c8 GJ |
51 | /* Lock the send communication. This is done through |
52 | * bit manipulation as opposed to a mutex in order to | |
53 | * accomodate lock and hold. See next comment. | |
54 | */ | |
55 | #define MD_CLUSTER_SEND_LOCK 4 | |
e19508fa GJ |
56 | /* If cluster operations (such as adding a disk) must lock the |
57 | * communication channel, so as to perform extra operations | |
58 | * (update metadata) and no other operation is allowed on the | |
59 | * MD. Token needs to be locked and held until the operation | |
60 | * completes witha md_update_sb(), which would eventually release | |
61 | * the lock. | |
8b9277c8 GJ |
62 | */ |
63 | #define MD_CLUSTER_SEND_LOCKED_ALREADY 5 | |
64 | ||
fa8259da | 65 | |
c4ce867f GR |
66 | struct md_cluster_info { |
67 | /* dlm lock space and resources for clustered raid. */ | |
68 | dlm_lockspace_t *lockspace; | |
cf921cc1 GR |
69 | int slot_number; |
70 | struct completion completion; | |
8b9277c8 | 71 | struct mutex recv_mutex; |
54519c5f | 72 | struct dlm_lock_resource *bitmap_lockres; |
f6a2dc64 | 73 | struct dlm_lock_resource **other_bitmap_lockres; |
c186b128 | 74 | struct dlm_lock_resource *resync_lockres; |
96ae923a GR |
75 | struct list_head suspend_list; |
76 | spinlock_t suspend_lock; | |
e94987db GR |
77 | struct md_thread *recovery_thread; |
78 | unsigned long recovery_map; | |
4664680c GR |
79 | /* communication loc resources */ |
80 | struct dlm_lock_resource *ack_lockres; | |
81 | struct dlm_lock_resource *message_lockres; | |
82 | struct dlm_lock_resource *token_lockres; | |
1aee41f6 | 83 | struct dlm_lock_resource *no_new_dev_lockres; |
4664680c | 84 | struct md_thread *recv_thread; |
1aee41f6 | 85 | struct completion newdisk_completion; |
8b9277c8 | 86 | wait_queue_head_t wait; |
fa8259da | 87 | unsigned long state; |
4664680c GR |
88 | }; |
89 | ||
90 | enum msg_type { | |
91 | METADATA_UPDATED = 0, | |
92 | RESYNCING, | |
1aee41f6 | 93 | NEWDISK, |
88bcfef7 | 94 | REMOVE, |
97f6cd39 | 95 | RE_ADD, |
dc737d7c | 96 | BITMAP_NEEDS_SYNC, |
4664680c GR |
97 | }; |
98 | ||
99 | struct cluster_msg { | |
cf97a348 GJ |
100 | __le32 type; |
101 | __le32 slot; | |
1aee41f6 | 102 | /* TODO: Unionize this for smaller footprint */ |
cf97a348 GJ |
103 | __le64 low; |
104 | __le64 high; | |
1aee41f6 | 105 | char uuid[16]; |
cf97a348 | 106 | __le32 raid_slot; |
47741b7c GR |
107 | }; |
108 | ||
109 | static void sync_ast(void *arg) | |
110 | { | |
111 | struct dlm_lock_resource *res; | |
112 | ||
2e2a7cd9 | 113 | res = arg; |
47741b7c GR |
114 | complete(&res->completion); |
115 | } | |
116 | ||
117 | static int dlm_lock_sync(struct dlm_lock_resource *res, int mode) | |
118 | { | |
119 | int ret = 0; | |
120 | ||
47741b7c GR |
121 | ret = dlm_lock(res->ls, mode, &res->lksb, |
122 | res->flags, res->name, strlen(res->name), | |
123 | 0, sync_ast, res, res->bast); | |
124 | if (ret) | |
125 | return ret; | |
126 | wait_for_completion(&res->completion); | |
dbb64f86 GR |
127 | if (res->lksb.sb_status == 0) |
128 | res->mode = mode; | |
47741b7c GR |
129 | return res->lksb.sb_status; |
130 | } | |
131 | ||
132 | static int dlm_unlock_sync(struct dlm_lock_resource *res) | |
133 | { | |
134 | return dlm_lock_sync(res, DLM_LOCK_NL); | |
135 | } | |
136 | ||
c4ce867f | 137 | static struct dlm_lock_resource *lockres_init(struct mddev *mddev, |
47741b7c GR |
138 | char *name, void (*bastfn)(void *arg, int mode), int with_lvb) |
139 | { | |
140 | struct dlm_lock_resource *res = NULL; | |
141 | int ret, namelen; | |
c4ce867f | 142 | struct md_cluster_info *cinfo = mddev->cluster_info; |
47741b7c GR |
143 | |
144 | res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL); | |
145 | if (!res) | |
146 | return NULL; | |
b83d51c0 | 147 | init_completion(&res->completion); |
c4ce867f GR |
148 | res->ls = cinfo->lockspace; |
149 | res->mddev = mddev; | |
dbb64f86 | 150 | res->mode = DLM_LOCK_IV; |
47741b7c GR |
151 | namelen = strlen(name); |
152 | res->name = kzalloc(namelen + 1, GFP_KERNEL); | |
153 | if (!res->name) { | |
154 | pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name); | |
155 | goto out_err; | |
156 | } | |
157 | strlcpy(res->name, name, namelen + 1); | |
158 | if (with_lvb) { | |
159 | res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL); | |
160 | if (!res->lksb.sb_lvbptr) { | |
161 | pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name); | |
162 | goto out_err; | |
163 | } | |
164 | res->flags = DLM_LKF_VALBLK; | |
165 | } | |
166 | ||
167 | if (bastfn) | |
168 | res->bast = bastfn; | |
169 | ||
170 | res->flags |= DLM_LKF_EXPEDITE; | |
171 | ||
172 | ret = dlm_lock_sync(res, DLM_LOCK_NL); | |
173 | if (ret) { | |
174 | pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name); | |
175 | goto out_err; | |
176 | } | |
177 | res->flags &= ~DLM_LKF_EXPEDITE; | |
178 | res->flags |= DLM_LKF_CONVERT; | |
179 | ||
180 | return res; | |
181 | out_err: | |
182 | kfree(res->lksb.sb_lvbptr); | |
183 | kfree(res->name); | |
184 | kfree(res); | |
185 | return NULL; | |
186 | } | |
187 | ||
188 | static void lockres_free(struct dlm_lock_resource *res) | |
189 | { | |
b5ef5678 GJ |
190 | int ret; |
191 | ||
47741b7c GR |
192 | if (!res) |
193 | return; | |
194 | ||
b5ef5678 GJ |
195 | /* cancel a lock request or a conversion request that is blocked */ |
196 | res->flags |= DLM_LKF_CANCEL; | |
197 | retry: | |
198 | ret = dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res); | |
199 | if (unlikely(ret != 0)) { | |
200 | pr_info("%s: failed to unlock %s return %d\n", __func__, res->name, ret); | |
201 | ||
202 | /* if a lock conversion is cancelled, then the lock is put | |
203 | * back to grant queue, need to ensure it is unlocked */ | |
204 | if (ret == -DLM_ECANCEL) | |
205 | goto retry; | |
206 | } | |
207 | res->flags &= ~DLM_LKF_CANCEL; | |
47741b7c GR |
208 | wait_for_completion(&res->completion); |
209 | ||
210 | kfree(res->name); | |
211 | kfree(res->lksb.sb_lvbptr); | |
212 | kfree(res); | |
213 | } | |
8e854e9c | 214 | |
30661b49 N |
215 | static void add_resync_info(struct dlm_lock_resource *lockres, |
216 | sector_t lo, sector_t hi) | |
96ae923a GR |
217 | { |
218 | struct resync_info *ri; | |
219 | ||
220 | ri = (struct resync_info *)lockres->lksb.sb_lvbptr; | |
221 | ri->lo = cpu_to_le64(lo); | |
222 | ri->hi = cpu_to_le64(hi); | |
223 | } | |
224 | ||
225 | static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres) | |
226 | { | |
227 | struct resync_info ri; | |
228 | struct suspend_info *s = NULL; | |
229 | sector_t hi = 0; | |
230 | ||
231 | dlm_lock_sync(lockres, DLM_LOCK_CR); | |
232 | memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); | |
233 | hi = le64_to_cpu(ri.hi); | |
cf97a348 | 234 | if (hi > 0) { |
96ae923a GR |
235 | s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); |
236 | if (!s) | |
237 | goto out; | |
238 | s->hi = hi; | |
239 | s->lo = le64_to_cpu(ri.lo); | |
240 | } | |
241 | dlm_unlock_sync(lockres); | |
242 | out: | |
243 | return s; | |
244 | } | |
245 | ||
6dc69c9c | 246 | static void recover_bitmaps(struct md_thread *thread) |
e94987db GR |
247 | { |
248 | struct mddev *mddev = thread->mddev; | |
249 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
250 | struct dlm_lock_resource *bm_lockres; | |
251 | char str[64]; | |
252 | int slot, ret; | |
253 | struct suspend_info *s, *tmp; | |
254 | sector_t lo, hi; | |
255 | ||
256 | while (cinfo->recovery_map) { | |
257 | slot = fls64((u64)cinfo->recovery_map) - 1; | |
258 | ||
259 | /* Clear suspend_area associated with the bitmap */ | |
260 | spin_lock_irq(&cinfo->suspend_lock); | |
261 | list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) | |
262 | if (slot == s->slot) { | |
263 | list_del(&s->list); | |
264 | kfree(s); | |
265 | } | |
266 | spin_unlock_irq(&cinfo->suspend_lock); | |
267 | ||
268 | snprintf(str, 64, "bitmap%04d", slot); | |
269 | bm_lockres = lockres_init(mddev, str, NULL, 1); | |
270 | if (!bm_lockres) { | |
271 | pr_err("md-cluster: Cannot initialize bitmaps\n"); | |
272 | goto clear_bit; | |
273 | } | |
274 | ||
275 | ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); | |
276 | if (ret) { | |
277 | pr_err("md-cluster: Could not DLM lock %s: %d\n", | |
278 | str, ret); | |
279 | goto clear_bit; | |
280 | } | |
97f6cd39 | 281 | ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true); |
4b26a08a | 282 | if (ret) { |
e94987db | 283 | pr_err("md-cluster: Could not copy data from bitmap %d\n", slot); |
4b26a08a GR |
284 | goto dlm_unlock; |
285 | } | |
286 | if (hi > 0) { | |
287 | /* TODO:Wait for current resync to get over */ | |
288 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
289 | if (lo < mddev->recovery_cp) | |
290 | mddev->recovery_cp = lo; | |
291 | md_check_recovery(mddev); | |
292 | } | |
293 | dlm_unlock: | |
e94987db GR |
294 | dlm_unlock_sync(bm_lockres); |
295 | clear_bit: | |
4ac7a65f | 296 | lockres_free(bm_lockres); |
e94987db GR |
297 | clear_bit(slot, &cinfo->recovery_map); |
298 | } | |
299 | } | |
300 | ||
cf921cc1 GR |
301 | static void recover_prep(void *arg) |
302 | { | |
90382ed9 GR |
303 | struct mddev *mddev = arg; |
304 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
305 | set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); | |
cf921cc1 GR |
306 | } |
307 | ||
05cd0e51 | 308 | static void __recover_slot(struct mddev *mddev, int slot) |
cf921cc1 | 309 | { |
cf921cc1 GR |
310 | struct md_cluster_info *cinfo = mddev->cluster_info; |
311 | ||
05cd0e51 | 312 | set_bit(slot, &cinfo->recovery_map); |
e94987db GR |
313 | if (!cinfo->recovery_thread) { |
314 | cinfo->recovery_thread = md_register_thread(recover_bitmaps, | |
315 | mddev, "recover"); | |
316 | if (!cinfo->recovery_thread) { | |
317 | pr_warn("md-cluster: Could not create recovery thread\n"); | |
318 | return; | |
319 | } | |
320 | } | |
321 | md_wakeup_thread(cinfo->recovery_thread); | |
cf921cc1 GR |
322 | } |
323 | ||
05cd0e51 GJ |
324 | static void recover_slot(void *arg, struct dlm_slot *slot) |
325 | { | |
326 | struct mddev *mddev = arg; | |
327 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
328 | ||
329 | pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n", | |
330 | mddev->bitmap_info.cluster_name, | |
331 | slot->nodeid, slot->slot, | |
332 | cinfo->slot_number); | |
333 | /* deduct one since dlm slot starts from one while the num of | |
334 | * cluster-md begins with 0 */ | |
335 | __recover_slot(mddev, slot->slot - 1); | |
336 | } | |
337 | ||
cf921cc1 GR |
338 | static void recover_done(void *arg, struct dlm_slot *slots, |
339 | int num_slots, int our_slot, | |
340 | uint32_t generation) | |
341 | { | |
342 | struct mddev *mddev = arg; | |
343 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
344 | ||
345 | cinfo->slot_number = our_slot; | |
eece075c GJ |
346 | /* completion is only need to be complete when node join cluster, |
347 | * it doesn't need to run during another node's failure */ | |
348 | if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) { | |
349 | complete(&cinfo->completion); | |
350 | clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state); | |
351 | } | |
90382ed9 | 352 | clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); |
cf921cc1 GR |
353 | } |
354 | ||
eece075c GJ |
355 | /* the ops is called when node join the cluster, and do lock recovery |
356 | * if node failure occurs */ | |
cf921cc1 GR |
357 | static const struct dlm_lockspace_ops md_ls_ops = { |
358 | .recover_prep = recover_prep, | |
359 | .recover_slot = recover_slot, | |
360 | .recover_done = recover_done, | |
361 | }; | |
362 | ||
4664680c GR |
363 | /* |
364 | * The BAST function for the ack lock resource | |
365 | * This function wakes up the receive thread in | |
366 | * order to receive and process the message. | |
367 | */ | |
368 | static void ack_bast(void *arg, int mode) | |
369 | { | |
2e2a7cd9 | 370 | struct dlm_lock_resource *res = arg; |
4664680c GR |
371 | struct md_cluster_info *cinfo = res->mddev->cluster_info; |
372 | ||
373 | if (mode == DLM_LOCK_EX) | |
374 | md_wakeup_thread(cinfo->recv_thread); | |
375 | } | |
376 | ||
e59721cc GR |
377 | static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot) |
378 | { | |
379 | struct suspend_info *s, *tmp; | |
380 | ||
381 | list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) | |
382 | if (slot == s->slot) { | |
e59721cc GR |
383 | list_del(&s->list); |
384 | kfree(s); | |
385 | break; | |
386 | } | |
387 | } | |
388 | ||
b8ca846e | 389 | static void remove_suspend_info(struct mddev *mddev, int slot) |
e59721cc | 390 | { |
b8ca846e | 391 | struct md_cluster_info *cinfo = mddev->cluster_info; |
e59721cc GR |
392 | spin_lock_irq(&cinfo->suspend_lock); |
393 | __remove_suspend_info(cinfo, slot); | |
394 | spin_unlock_irq(&cinfo->suspend_lock); | |
b8ca846e | 395 | mddev->pers->quiesce(mddev, 2); |
e59721cc GR |
396 | } |
397 | ||
398 | ||
9ed38ff5 | 399 | static void process_suspend_info(struct mddev *mddev, |
e59721cc GR |
400 | int slot, sector_t lo, sector_t hi) |
401 | { | |
9ed38ff5 | 402 | struct md_cluster_info *cinfo = mddev->cluster_info; |
e59721cc GR |
403 | struct suspend_info *s; |
404 | ||
405 | if (!hi) { | |
b8ca846e | 406 | remove_suspend_info(mddev, slot); |
c186b128 GR |
407 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
408 | md_wakeup_thread(mddev->thread); | |
e59721cc GR |
409 | return; |
410 | } | |
411 | s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); | |
412 | if (!s) | |
413 | return; | |
414 | s->slot = slot; | |
415 | s->lo = lo; | |
416 | s->hi = hi; | |
9ed38ff5 GR |
417 | mddev->pers->quiesce(mddev, 1); |
418 | mddev->pers->quiesce(mddev, 0); | |
e59721cc GR |
419 | spin_lock_irq(&cinfo->suspend_lock); |
420 | /* Remove existing entry (if exists) before adding */ | |
421 | __remove_suspend_info(cinfo, slot); | |
422 | list_add(&s->list, &cinfo->suspend_list); | |
423 | spin_unlock_irq(&cinfo->suspend_lock); | |
b8ca846e | 424 | mddev->pers->quiesce(mddev, 2); |
e59721cc GR |
425 | } |
426 | ||
1aee41f6 GR |
427 | static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg) |
428 | { | |
429 | char disk_uuid[64]; | |
430 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
431 | char event_name[] = "EVENT=ADD_DEVICE"; | |
432 | char raid_slot[16]; | |
433 | char *envp[] = {event_name, disk_uuid, raid_slot, NULL}; | |
434 | int len; | |
435 | ||
436 | len = snprintf(disk_uuid, 64, "DEVICE_UUID="); | |
b89f704a | 437 | sprintf(disk_uuid + len, "%pU", cmsg->uuid); |
faeff83f | 438 | snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot)); |
1aee41f6 GR |
439 | pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot); |
440 | init_completion(&cinfo->newdisk_completion); | |
fa8259da | 441 | set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); |
1aee41f6 GR |
442 | kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp); |
443 | wait_for_completion_timeout(&cinfo->newdisk_completion, | |
444 | NEW_DEV_TIMEOUT); | |
fa8259da | 445 | clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); |
1aee41f6 GR |
446 | } |
447 | ||
448 | ||
449 | static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg) | |
450 | { | |
451 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
15858fa5 GJ |
452 | mddev->good_device_nr = le32_to_cpu(msg->raid_slot); |
453 | set_bit(MD_RELOAD_SB, &mddev->flags); | |
1aee41f6 | 454 | dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); |
15858fa5 | 455 | md_wakeup_thread(mddev->thread); |
1aee41f6 GR |
456 | } |
457 | ||
88bcfef7 GR |
458 | static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg) |
459 | { | |
faeff83f GJ |
460 | struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, |
461 | le32_to_cpu(msg->raid_slot)); | |
88bcfef7 | 462 | |
659b254f GJ |
463 | if (rdev) { |
464 | set_bit(ClusterRemove, &rdev->flags); | |
465 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
466 | md_wakeup_thread(mddev->thread); | |
467 | } | |
88bcfef7 | 468 | else |
faeff83f GJ |
469 | pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", |
470 | __func__, __LINE__, le32_to_cpu(msg->raid_slot)); | |
88bcfef7 GR |
471 | } |
472 | ||
97f6cd39 GR |
473 | static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg) |
474 | { | |
faeff83f GJ |
475 | struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, |
476 | le32_to_cpu(msg->raid_slot)); | |
97f6cd39 GR |
477 | |
478 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
479 | clear_bit(Faulty, &rdev->flags); | |
480 | else | |
faeff83f GJ |
481 | pr_warn("%s: %d Could not find disk(%d) which is faulty", |
482 | __func__, __LINE__, le32_to_cpu(msg->raid_slot)); | |
97f6cd39 GR |
483 | } |
484 | ||
4664680c GR |
485 | static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) |
486 | { | |
256f5b24 GJ |
487 | if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot), |
488 | "node %d received it's own msg\n", le32_to_cpu(msg->slot))) | |
489 | return; | |
cf97a348 | 490 | switch (le32_to_cpu(msg->type)) { |
4664680c | 491 | case METADATA_UPDATED: |
1aee41f6 | 492 | process_metadata_update(mddev, msg); |
4664680c GR |
493 | break; |
494 | case RESYNCING: | |
cf97a348 GJ |
495 | process_suspend_info(mddev, le32_to_cpu(msg->slot), |
496 | le64_to_cpu(msg->low), | |
497 | le64_to_cpu(msg->high)); | |
4664680c | 498 | break; |
1aee41f6 | 499 | case NEWDISK: |
1aee41f6 | 500 | process_add_new_disk(mddev, msg); |
88bcfef7 GR |
501 | break; |
502 | case REMOVE: | |
88bcfef7 GR |
503 | process_remove_disk(mddev, msg); |
504 | break; | |
97f6cd39 | 505 | case RE_ADD: |
97f6cd39 GR |
506 | process_readd_disk(mddev, msg); |
507 | break; | |
dc737d7c | 508 | case BITMAP_NEEDS_SYNC: |
cf97a348 | 509 | __recover_slot(mddev, le32_to_cpu(msg->slot)); |
dc737d7c | 510 | break; |
88bcfef7 GR |
511 | default: |
512 | pr_warn("%s:%d Received unknown message from %d\n", | |
513 | __func__, __LINE__, msg->slot); | |
09dd1af2 | 514 | } |
4664680c GR |
515 | } |
516 | ||
517 | /* | |
518 | * thread for receiving message | |
519 | */ | |
520 | static void recv_daemon(struct md_thread *thread) | |
521 | { | |
522 | struct md_cluster_info *cinfo = thread->mddev->cluster_info; | |
523 | struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres; | |
524 | struct dlm_lock_resource *message_lockres = cinfo->message_lockres; | |
525 | struct cluster_msg msg; | |
b5ef5678 | 526 | int ret; |
4664680c | 527 | |
8b9277c8 | 528 | mutex_lock(&cinfo->recv_mutex); |
4664680c GR |
529 | /*get CR on Message*/ |
530 | if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) { | |
531 | pr_err("md/raid1:failed to get CR on MESSAGE\n"); | |
8b9277c8 | 532 | mutex_unlock(&cinfo->recv_mutex); |
4664680c GR |
533 | return; |
534 | } | |
535 | ||
536 | /* read lvb and wake up thread to process this message_lockres */ | |
537 | memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg)); | |
538 | process_recvd_msg(thread->mddev, &msg); | |
539 | ||
540 | /*release CR on ack_lockres*/ | |
b5ef5678 GJ |
541 | ret = dlm_unlock_sync(ack_lockres); |
542 | if (unlikely(ret != 0)) | |
543 | pr_info("unlock ack failed return %d\n", ret); | |
66099bb0 | 544 | /*up-convert to PR on message_lockres*/ |
b5ef5678 GJ |
545 | ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR); |
546 | if (unlikely(ret != 0)) | |
547 | pr_info("lock PR on msg failed return %d\n", ret); | |
4664680c | 548 | /*get CR on ack_lockres again*/ |
b5ef5678 GJ |
549 | ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR); |
550 | if (unlikely(ret != 0)) | |
551 | pr_info("lock CR on ack failed return %d\n", ret); | |
4664680c | 552 | /*release CR on message_lockres*/ |
b5ef5678 GJ |
553 | ret = dlm_unlock_sync(message_lockres); |
554 | if (unlikely(ret != 0)) | |
555 | pr_info("unlock msg failed return %d\n", ret); | |
8b9277c8 | 556 | mutex_unlock(&cinfo->recv_mutex); |
4664680c GR |
557 | } |
558 | ||
8b9277c8 | 559 | /* lock_token() |
601b515c GR |
560 | * Takes the lock on the TOKEN lock resource so no other |
561 | * node can communicate while the operation is underway. | |
562 | */ | |
8b9277c8 | 563 | static int lock_token(struct md_cluster_info *cinfo) |
601b515c GR |
564 | { |
565 | int error; | |
566 | ||
567 | error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); | |
568 | if (error) | |
569 | pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n", | |
570 | __func__, __LINE__, error); | |
8b9277c8 GJ |
571 | |
572 | /* Lock the receive sequence */ | |
573 | mutex_lock(&cinfo->recv_mutex); | |
601b515c GR |
574 | return error; |
575 | } | |
576 | ||
8b9277c8 GJ |
577 | /* lock_comm() |
578 | * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel. | |
579 | */ | |
580 | static int lock_comm(struct md_cluster_info *cinfo) | |
581 | { | |
582 | wait_event(cinfo->wait, | |
583 | !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state)); | |
584 | ||
585 | return lock_token(cinfo); | |
586 | } | |
587 | ||
601b515c GR |
588 | static void unlock_comm(struct md_cluster_info *cinfo) |
589 | { | |
dbb64f86 | 590 | WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX); |
8b9277c8 | 591 | mutex_unlock(&cinfo->recv_mutex); |
601b515c | 592 | dlm_unlock_sync(cinfo->token_lockres); |
8b9277c8 GJ |
593 | clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state); |
594 | wake_up(&cinfo->wait); | |
601b515c GR |
595 | } |
596 | ||
597 | /* __sendmsg() | |
598 | * This function performs the actual sending of the message. This function is | |
599 | * usually called after performing the encompassing operation | |
600 | * The function: | |
601 | * 1. Grabs the message lockresource in EX mode | |
602 | * 2. Copies the message to the message LVB | |
66099bb0 | 603 | * 3. Downconverts message lockresource to CW |
601b515c GR |
604 | * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes |
605 | * and the other nodes read the message. The thread will wait here until all other | |
606 | * nodes have released ack lock resource. | |
607 | * 5. Downconvert ack lockresource to CR | |
608 | */ | |
609 | static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) | |
610 | { | |
611 | int error; | |
612 | int slot = cinfo->slot_number - 1; | |
613 | ||
614 | cmsg->slot = cpu_to_le32(slot); | |
615 | /*get EX on Message*/ | |
616 | error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX); | |
617 | if (error) { | |
618 | pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error); | |
619 | goto failed_message; | |
620 | } | |
621 | ||
622 | memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg, | |
623 | sizeof(struct cluster_msg)); | |
66099bb0 GJ |
624 | /*down-convert EX to CW on Message*/ |
625 | error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW); | |
601b515c | 626 | if (error) { |
66099bb0 | 627 | pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n", |
601b515c | 628 | error); |
66099bb0 | 629 | goto failed_ack; |
601b515c GR |
630 | } |
631 | ||
632 | /*up-convert CR to EX on Ack*/ | |
633 | error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX); | |
634 | if (error) { | |
635 | pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n", | |
636 | error); | |
637 | goto failed_ack; | |
638 | } | |
639 | ||
640 | /*down-convert EX to CR on Ack*/ | |
641 | error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR); | |
642 | if (error) { | |
643 | pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n", | |
644 | error); | |
645 | goto failed_ack; | |
646 | } | |
647 | ||
648 | failed_ack: | |
b5ef5678 GJ |
649 | error = dlm_unlock_sync(cinfo->message_lockres); |
650 | if (unlikely(error != 0)) { | |
651 | pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n", | |
652 | error); | |
653 | /* in case the message can't be released due to some reason */ | |
654 | goto failed_ack; | |
655 | } | |
601b515c GR |
656 | failed_message: |
657 | return error; | |
658 | } | |
659 | ||
660 | static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) | |
661 | { | |
662 | int ret; | |
663 | ||
664 | lock_comm(cinfo); | |
665 | ret = __sendmsg(cinfo, cmsg); | |
666 | unlock_comm(cinfo); | |
667 | return ret; | |
668 | } | |
669 | ||
96ae923a GR |
670 | static int gather_all_resync_info(struct mddev *mddev, int total_slots) |
671 | { | |
672 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
673 | int i, ret = 0; | |
674 | struct dlm_lock_resource *bm_lockres; | |
675 | struct suspend_info *s; | |
676 | char str[64]; | |
abb9b22a | 677 | sector_t lo, hi; |
96ae923a GR |
678 | |
679 | ||
680 | for (i = 0; i < total_slots; i++) { | |
681 | memset(str, '\0', 64); | |
682 | snprintf(str, 64, "bitmap%04d", i); | |
683 | bm_lockres = lockres_init(mddev, str, NULL, 1); | |
684 | if (!bm_lockres) | |
685 | return -ENOMEM; | |
4ac7a65f SL |
686 | if (i == (cinfo->slot_number - 1)) { |
687 | lockres_free(bm_lockres); | |
96ae923a | 688 | continue; |
4ac7a65f | 689 | } |
96ae923a GR |
690 | |
691 | bm_lockres->flags |= DLM_LKF_NOQUEUE; | |
692 | ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); | |
693 | if (ret == -EAGAIN) { | |
694 | memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE); | |
695 | s = read_resync_info(mddev, bm_lockres); | |
696 | if (s) { | |
697 | pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n", | |
698 | __func__, __LINE__, | |
699 | (unsigned long long) s->lo, | |
700 | (unsigned long long) s->hi, i); | |
701 | spin_lock_irq(&cinfo->suspend_lock); | |
702 | s->slot = i; | |
703 | list_add(&s->list, &cinfo->suspend_list); | |
704 | spin_unlock_irq(&cinfo->suspend_lock); | |
705 | } | |
706 | ret = 0; | |
707 | lockres_free(bm_lockres); | |
708 | continue; | |
709 | } | |
6e6d9f2c GJ |
710 | if (ret) { |
711 | lockres_free(bm_lockres); | |
96ae923a | 712 | goto out; |
6e6d9f2c | 713 | } |
abb9b22a GJ |
714 | |
715 | /* Read the disk bitmap sb and check if it needs recovery */ | |
716 | ret = bitmap_copy_from_slot(mddev, i, &lo, &hi, false); | |
717 | if (ret) { | |
718 | pr_warn("md-cluster: Could not gather bitmaps from slot %d", i); | |
719 | lockres_free(bm_lockres); | |
720 | continue; | |
721 | } | |
722 | if ((hi > 0) && (lo < mddev->recovery_cp)) { | |
723 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
724 | mddev->recovery_cp = lo; | |
725 | md_check_recovery(mddev); | |
726 | } | |
727 | ||
96ae923a GR |
728 | dlm_unlock_sync(bm_lockres); |
729 | lockres_free(bm_lockres); | |
730 | } | |
731 | out: | |
732 | return ret; | |
733 | } | |
734 | ||
edb39c9d GR |
735 | static int join(struct mddev *mddev, int nodes) |
736 | { | |
c4ce867f | 737 | struct md_cluster_info *cinfo; |
cf921cc1 | 738 | int ret, ops_rv; |
c4ce867f GR |
739 | char str[64]; |
740 | ||
c4ce867f GR |
741 | cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL); |
742 | if (!cinfo) | |
743 | return -ENOMEM; | |
744 | ||
9e3072e3 GJ |
745 | INIT_LIST_HEAD(&cinfo->suspend_list); |
746 | spin_lock_init(&cinfo->suspend_lock); | |
cf921cc1 | 747 | init_completion(&cinfo->completion); |
eece075c | 748 | set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state); |
8b9277c8 GJ |
749 | init_waitqueue_head(&cinfo->wait); |
750 | mutex_init(&cinfo->recv_mutex); | |
cf921cc1 | 751 | |
cf921cc1 GR |
752 | mddev->cluster_info = cinfo; |
753 | ||
c4ce867f | 754 | memset(str, 0, 64); |
b89f704a | 755 | sprintf(str, "%pU", mddev->uuid); |
cf921cc1 GR |
756 | ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name, |
757 | DLM_LSFL_FS, LVB_SIZE, | |
758 | &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace); | |
c4ce867f GR |
759 | if (ret) |
760 | goto err; | |
cf921cc1 | 761 | wait_for_completion(&cinfo->completion); |
8c58f02e GJ |
762 | if (nodes < cinfo->slot_number) { |
763 | pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).", | |
764 | cinfo->slot_number, nodes); | |
b97e9257 GR |
765 | ret = -ERANGE; |
766 | goto err; | |
767 | } | |
4664680c GR |
768 | /* Initiate the communication resources */ |
769 | ret = -ENOMEM; | |
770 | cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv"); | |
771 | if (!cinfo->recv_thread) { | |
772 | pr_err("md-cluster: cannot allocate memory for recv_thread!\n"); | |
773 | goto err; | |
774 | } | |
775 | cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1); | |
776 | if (!cinfo->message_lockres) | |
777 | goto err; | |
778 | cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0); | |
779 | if (!cinfo->token_lockres) | |
780 | goto err; | |
781 | cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0); | |
782 | if (!cinfo->ack_lockres) | |
783 | goto err; | |
1aee41f6 GR |
784 | cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0); |
785 | if (!cinfo->no_new_dev_lockres) | |
786 | goto err; | |
787 | ||
4664680c GR |
788 | /* get sync CR lock on ACK. */ |
789 | if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR)) | |
790 | pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n", | |
791 | ret); | |
1aee41f6 GR |
792 | /* get sync CR lock on no-new-dev. */ |
793 | if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR)) | |
794 | pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret); | |
795 | ||
54519c5f GR |
796 | |
797 | pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number); | |
798 | snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1); | |
799 | cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1); | |
800 | if (!cinfo->bitmap_lockres) | |
801 | goto err; | |
802 | if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) { | |
803 | pr_err("Failed to get bitmap lock\n"); | |
804 | ret = -EINVAL; | |
805 | goto err; | |
806 | } | |
807 | ||
c186b128 GR |
808 | cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0); |
809 | if (!cinfo->resync_lockres) | |
810 | goto err; | |
811 | ||
96ae923a GR |
812 | ret = gather_all_resync_info(mddev, nodes); |
813 | if (ret) | |
814 | goto err; | |
815 | ||
edb39c9d | 816 | return 0; |
c4ce867f | 817 | err: |
4664680c GR |
818 | lockres_free(cinfo->message_lockres); |
819 | lockres_free(cinfo->token_lockres); | |
820 | lockres_free(cinfo->ack_lockres); | |
1aee41f6 | 821 | lockres_free(cinfo->no_new_dev_lockres); |
c186b128 | 822 | lockres_free(cinfo->resync_lockres); |
96ae923a | 823 | lockres_free(cinfo->bitmap_lockres); |
c4ce867f GR |
824 | if (cinfo->lockspace) |
825 | dlm_release_lockspace(cinfo->lockspace, 2); | |
cf921cc1 | 826 | mddev->cluster_info = NULL; |
c4ce867f | 827 | kfree(cinfo); |
c4ce867f | 828 | return ret; |
edb39c9d GR |
829 | } |
830 | ||
09995411 GJ |
831 | static void resync_bitmap(struct mddev *mddev) |
832 | { | |
833 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
834 | struct cluster_msg cmsg = {0}; | |
835 | int err; | |
836 | ||
837 | cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC); | |
838 | err = sendmsg(cinfo, &cmsg); | |
839 | if (err) | |
840 | pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n", | |
841 | __func__, __LINE__, err); | |
842 | } | |
843 | ||
f6a2dc64 | 844 | static void unlock_all_bitmaps(struct mddev *mddev); |
edb39c9d GR |
845 | static int leave(struct mddev *mddev) |
846 | { | |
c4ce867f GR |
847 | struct md_cluster_info *cinfo = mddev->cluster_info; |
848 | ||
849 | if (!cinfo) | |
850 | return 0; | |
09995411 GJ |
851 | |
852 | /* BITMAP_NEEDS_SYNC message should be sent when node | |
853 | * is leaving the cluster with dirty bitmap, also we | |
854 | * can only deliver it when dlm connection is available */ | |
855 | if (cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector) | |
856 | resync_bitmap(mddev); | |
857 | ||
e94987db | 858 | md_unregister_thread(&cinfo->recovery_thread); |
4664680c GR |
859 | md_unregister_thread(&cinfo->recv_thread); |
860 | lockres_free(cinfo->message_lockres); | |
861 | lockres_free(cinfo->token_lockres); | |
862 | lockres_free(cinfo->ack_lockres); | |
1aee41f6 | 863 | lockres_free(cinfo->no_new_dev_lockres); |
4ac7a65f | 864 | lockres_free(cinfo->resync_lockres); |
54519c5f | 865 | lockres_free(cinfo->bitmap_lockres); |
f6a2dc64 | 866 | unlock_all_bitmaps(mddev); |
c4ce867f | 867 | dlm_release_lockspace(cinfo->lockspace, 2); |
edb39c9d GR |
868 | return 0; |
869 | } | |
870 | ||
cf921cc1 GR |
871 | /* slot_number(): Returns the MD slot number to use |
872 | * DLM starts the slot numbers from 1, wheras cluster-md | |
873 | * wants the number to be from zero, so we deduct one | |
874 | */ | |
875 | static int slot_number(struct mddev *mddev) | |
876 | { | |
877 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
878 | ||
879 | return cinfo->slot_number - 1; | |
880 | } | |
881 | ||
8b9277c8 GJ |
882 | /* |
883 | * Check if the communication is already locked, else lock the communication | |
884 | * channel. | |
885 | * If it is already locked, token is in EX mode, and hence lock_token() | |
886 | * should not be called. | |
887 | */ | |
293467aa GR |
888 | static int metadata_update_start(struct mddev *mddev) |
889 | { | |
8b9277c8 GJ |
890 | struct md_cluster_info *cinfo = mddev->cluster_info; |
891 | ||
892 | wait_event(cinfo->wait, | |
893 | !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) || | |
894 | test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state)); | |
895 | ||
896 | /* If token is already locked, return 0 */ | |
897 | if (cinfo->token_lockres->mode == DLM_LOCK_EX) | |
898 | return 0; | |
899 | ||
900 | return lock_token(cinfo); | |
293467aa GR |
901 | } |
902 | ||
903 | static int metadata_update_finish(struct mddev *mddev) | |
904 | { | |
905 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
906 | struct cluster_msg cmsg; | |
70bcecdb GR |
907 | struct md_rdev *rdev; |
908 | int ret = 0; | |
ba2746b0 | 909 | int raid_slot = -1; |
293467aa GR |
910 | |
911 | memset(&cmsg, 0, sizeof(cmsg)); | |
912 | cmsg.type = cpu_to_le32(METADATA_UPDATED); | |
70bcecdb GR |
913 | /* Pick up a good active device number to send. |
914 | */ | |
915 | rdev_for_each(rdev, mddev) | |
916 | if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) { | |
ba2746b0 | 917 | raid_slot = rdev->desc_nr; |
70bcecdb GR |
918 | break; |
919 | } | |
ba2746b0 N |
920 | if (raid_slot >= 0) { |
921 | cmsg.raid_slot = cpu_to_le32(raid_slot); | |
70bcecdb | 922 | ret = __sendmsg(cinfo, &cmsg); |
ba2746b0 | 923 | } else |
70bcecdb | 924 | pr_warn("md-cluster: No good device id found to send\n"); |
8b9277c8 | 925 | clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
293467aa GR |
926 | unlock_comm(cinfo); |
927 | return ret; | |
928 | } | |
929 | ||
dbb64f86 | 930 | static void metadata_update_cancel(struct mddev *mddev) |
293467aa GR |
931 | { |
932 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
8b9277c8 | 933 | clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
dbb64f86 | 934 | unlock_comm(cinfo); |
293467aa GR |
935 | } |
936 | ||
c186b128 GR |
937 | static int resync_start(struct mddev *mddev) |
938 | { | |
939 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
940 | cinfo->resync_lockres->flags |= DLM_LKF_NOQUEUE; | |
941 | return dlm_lock_sync(cinfo->resync_lockres, DLM_LOCK_EX); | |
942 | } | |
943 | ||
c40f341f | 944 | static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi) |
965400eb GR |
945 | { |
946 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
ac277c6a | 947 | struct resync_info ri; |
aee177ac | 948 | struct cluster_msg cmsg = {0}; |
965400eb | 949 | |
ac277c6a GR |
950 | /* do not send zero again, if we have sent before */ |
951 | if (hi == 0) { | |
952 | memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); | |
953 | if (le64_to_cpu(ri.hi) == 0) | |
954 | return 0; | |
955 | } | |
956 | ||
30661b49 | 957 | add_resync_info(cinfo->bitmap_lockres, lo, hi); |
c40f341f GR |
958 | /* Re-acquire the lock to refresh LVB */ |
959 | dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW); | |
c40f341f | 960 | cmsg.type = cpu_to_le32(RESYNCING); |
965400eb GR |
961 | cmsg.low = cpu_to_le64(lo); |
962 | cmsg.high = cpu_to_le64(hi); | |
c186b128 | 963 | |
965400eb GR |
964 | return sendmsg(cinfo, &cmsg); |
965 | } | |
966 | ||
c186b128 GR |
967 | static int resync_finish(struct mddev *mddev) |
968 | { | |
969 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
970 | cinfo->resync_lockres->flags &= ~DLM_LKF_NOQUEUE; | |
971 | dlm_unlock_sync(cinfo->resync_lockres); | |
972 | return resync_info_update(mddev, 0, 0); | |
973 | } | |
974 | ||
90382ed9 GR |
975 | static int area_resyncing(struct mddev *mddev, int direction, |
976 | sector_t lo, sector_t hi) | |
589a1c49 GR |
977 | { |
978 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
979 | int ret = 0; | |
980 | struct suspend_info *s; | |
981 | ||
90382ed9 GR |
982 | if ((direction == READ) && |
983 | test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state)) | |
984 | return 1; | |
985 | ||
589a1c49 GR |
986 | spin_lock_irq(&cinfo->suspend_lock); |
987 | if (list_empty(&cinfo->suspend_list)) | |
988 | goto out; | |
989 | list_for_each_entry(s, &cinfo->suspend_list, list) | |
990 | if (hi > s->lo && lo < s->hi) { | |
991 | ret = 1; | |
992 | break; | |
993 | } | |
994 | out: | |
995 | spin_unlock_irq(&cinfo->suspend_lock); | |
996 | return ret; | |
997 | } | |
998 | ||
dbb64f86 GR |
999 | /* add_new_disk() - initiates a disk add |
1000 | * However, if this fails before writing md_update_sb(), | |
1001 | * add_new_disk_cancel() must be called to release token lock | |
1002 | */ | |
1003 | static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev) | |
1aee41f6 GR |
1004 | { |
1005 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1006 | struct cluster_msg cmsg; | |
1007 | int ret = 0; | |
1008 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); | |
1009 | char *uuid = sb->device_uuid; | |
1010 | ||
1011 | memset(&cmsg, 0, sizeof(cmsg)); | |
1012 | cmsg.type = cpu_to_le32(NEWDISK); | |
1013 | memcpy(cmsg.uuid, uuid, 16); | |
faeff83f | 1014 | cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); |
1aee41f6 GR |
1015 | lock_comm(cinfo); |
1016 | ret = __sendmsg(cinfo, &cmsg); | |
1017 | if (ret) | |
1018 | return ret; | |
1019 | cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE; | |
1020 | ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX); | |
1021 | cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE; | |
1022 | /* Some node does not "see" the device */ | |
1023 | if (ret == -EAGAIN) | |
1024 | ret = -ENOENT; | |
dbb64f86 GR |
1025 | if (ret) |
1026 | unlock_comm(cinfo); | |
8b9277c8 | 1027 | else { |
1aee41f6 | 1028 | dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); |
e19508fa GJ |
1029 | /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which |
1030 | * will run soon after add_new_disk, the below path will be | |
1031 | * invoked: | |
1032 | * md_wakeup_thread(mddev->thread) | |
1033 | * -> conf->thread (raid1d) | |
1034 | * -> md_check_recovery -> md_update_sb | |
1035 | * -> metadata_update_start/finish | |
1036 | * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually. | |
1037 | * | |
1038 | * For other failure cases, metadata_update_cancel and | |
1039 | * add_new_disk_cancel also clear below bit as well. | |
1040 | * */ | |
8b9277c8 GJ |
1041 | set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
1042 | wake_up(&cinfo->wait); | |
1043 | } | |
1aee41f6 GR |
1044 | return ret; |
1045 | } | |
1046 | ||
dbb64f86 | 1047 | static void add_new_disk_cancel(struct mddev *mddev) |
1aee41f6 | 1048 | { |
dbb64f86 | 1049 | struct md_cluster_info *cinfo = mddev->cluster_info; |
8b9277c8 | 1050 | clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
dbb64f86 | 1051 | unlock_comm(cinfo); |
1aee41f6 GR |
1052 | } |
1053 | ||
fa8259da | 1054 | static int new_disk_ack(struct mddev *mddev, bool ack) |
1aee41f6 GR |
1055 | { |
1056 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1057 | ||
fa8259da GR |
1058 | if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) { |
1059 | pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev)); | |
1060 | return -EINVAL; | |
1061 | } | |
1062 | ||
1aee41f6 GR |
1063 | if (ack) |
1064 | dlm_unlock_sync(cinfo->no_new_dev_lockres); | |
1065 | complete(&cinfo->newdisk_completion); | |
fa8259da | 1066 | return 0; |
1aee41f6 GR |
1067 | } |
1068 | ||
88bcfef7 GR |
1069 | static int remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1070 | { | |
aee177ac | 1071 | struct cluster_msg cmsg = {0}; |
88bcfef7 | 1072 | struct md_cluster_info *cinfo = mddev->cluster_info; |
faeff83f GJ |
1073 | cmsg.type = cpu_to_le32(REMOVE); |
1074 | cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); | |
54a88392 | 1075 | return sendmsg(cinfo, &cmsg); |
88bcfef7 GR |
1076 | } |
1077 | ||
f6a2dc64 GJ |
1078 | static int lock_all_bitmaps(struct mddev *mddev) |
1079 | { | |
1080 | int slot, my_slot, ret, held = 1, i = 0; | |
1081 | char str[64]; | |
1082 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1083 | ||
1084 | cinfo->other_bitmap_lockres = kzalloc((mddev->bitmap_info.nodes - 1) * | |
1085 | sizeof(struct dlm_lock_resource *), | |
1086 | GFP_KERNEL); | |
1087 | if (!cinfo->other_bitmap_lockres) { | |
1088 | pr_err("md: can't alloc mem for other bitmap locks\n"); | |
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | my_slot = slot_number(mddev); | |
1093 | for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) { | |
1094 | if (slot == my_slot) | |
1095 | continue; | |
1096 | ||
1097 | memset(str, '\0', 64); | |
1098 | snprintf(str, 64, "bitmap%04d", slot); | |
1099 | cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1); | |
1100 | if (!cinfo->other_bitmap_lockres[i]) | |
1101 | return -ENOMEM; | |
1102 | ||
1103 | cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE; | |
1104 | ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW); | |
1105 | if (ret) | |
1106 | held = -1; | |
1107 | i++; | |
1108 | } | |
1109 | ||
1110 | return held; | |
1111 | } | |
1112 | ||
1113 | static void unlock_all_bitmaps(struct mddev *mddev) | |
1114 | { | |
1115 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1116 | int i; | |
1117 | ||
1118 | /* release other node's bitmap lock if they are existed */ | |
1119 | if (cinfo->other_bitmap_lockres) { | |
1120 | for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) { | |
1121 | if (cinfo->other_bitmap_lockres[i]) { | |
1122 | dlm_unlock_sync(cinfo->other_bitmap_lockres[i]); | |
1123 | lockres_free(cinfo->other_bitmap_lockres[i]); | |
1124 | } | |
1125 | } | |
1126 | kfree(cinfo->other_bitmap_lockres); | |
1127 | } | |
1128 | } | |
1129 | ||
97f6cd39 GR |
1130 | static int gather_bitmaps(struct md_rdev *rdev) |
1131 | { | |
1132 | int sn, err; | |
1133 | sector_t lo, hi; | |
aee177ac | 1134 | struct cluster_msg cmsg = {0}; |
97f6cd39 GR |
1135 | struct mddev *mddev = rdev->mddev; |
1136 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1137 | ||
faeff83f GJ |
1138 | cmsg.type = cpu_to_le32(RE_ADD); |
1139 | cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); | |
97f6cd39 GR |
1140 | err = sendmsg(cinfo, &cmsg); |
1141 | if (err) | |
1142 | goto out; | |
1143 | ||
1144 | for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) { | |
1145 | if (sn == (cinfo->slot_number - 1)) | |
1146 | continue; | |
1147 | err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false); | |
1148 | if (err) { | |
1149 | pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn); | |
1150 | goto out; | |
1151 | } | |
1152 | if ((hi > 0) && (lo < mddev->recovery_cp)) | |
1153 | mddev->recovery_cp = lo; | |
1154 | } | |
1155 | out: | |
1156 | return err; | |
1157 | } | |
1158 | ||
edb39c9d GR |
1159 | static struct md_cluster_operations cluster_ops = { |
1160 | .join = join, | |
1161 | .leave = leave, | |
cf921cc1 | 1162 | .slot_number = slot_number, |
c186b128 GR |
1163 | .resync_start = resync_start, |
1164 | .resync_finish = resync_finish, | |
96ae923a | 1165 | .resync_info_update = resync_info_update, |
293467aa GR |
1166 | .metadata_update_start = metadata_update_start, |
1167 | .metadata_update_finish = metadata_update_finish, | |
1168 | .metadata_update_cancel = metadata_update_cancel, | |
589a1c49 | 1169 | .area_resyncing = area_resyncing, |
dbb64f86 GR |
1170 | .add_new_disk = add_new_disk, |
1171 | .add_new_disk_cancel = add_new_disk_cancel, | |
1aee41f6 | 1172 | .new_disk_ack = new_disk_ack, |
88bcfef7 | 1173 | .remove_disk = remove_disk, |
97f6cd39 | 1174 | .gather_bitmaps = gather_bitmaps, |
f6a2dc64 GJ |
1175 | .lock_all_bitmaps = lock_all_bitmaps, |
1176 | .unlock_all_bitmaps = unlock_all_bitmaps, | |
edb39c9d GR |
1177 | }; |
1178 | ||
8e854e9c GR |
1179 | static int __init cluster_init(void) |
1180 | { | |
1181 | pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n"); | |
1182 | pr_info("Registering Cluster MD functions\n"); | |
edb39c9d | 1183 | register_md_cluster_operations(&cluster_ops, THIS_MODULE); |
8e854e9c GR |
1184 | return 0; |
1185 | } | |
1186 | ||
1187 | static void cluster_exit(void) | |
1188 | { | |
edb39c9d | 1189 | unregister_md_cluster_operations(); |
8e854e9c GR |
1190 | } |
1191 | ||
1192 | module_init(cluster_init); | |
1193 | module_exit(cluster_exit); | |
86b57277 | 1194 | MODULE_AUTHOR("SUSE"); |
8e854e9c GR |
1195 | MODULE_LICENSE("GPL"); |
1196 | MODULE_DESCRIPTION("Clustering support for MD"); |