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> | |
7bcda714 | 13 | #include <linux/kthread.h> |
47741b7c GR |
14 | #include <linux/dlm.h> |
15 | #include <linux/sched.h> | |
1aee41f6 | 16 | #include <linux/raid/md_p.h> |
47741b7c | 17 | #include "md.h" |
e94987db | 18 | #include "bitmap.h" |
edb39c9d | 19 | #include "md-cluster.h" |
47741b7c GR |
20 | |
21 | #define LVB_SIZE 64 | |
1aee41f6 | 22 | #define NEW_DEV_TIMEOUT 5000 |
47741b7c GR |
23 | |
24 | struct dlm_lock_resource { | |
25 | dlm_lockspace_t *ls; | |
26 | struct dlm_lksb lksb; | |
27 | char *name; /* lock name. */ | |
28 | uint32_t flags; /* flags to pass to dlm_lock() */ | |
fccb60a4 GJ |
29 | wait_queue_head_t sync_locking; /* wait queue for synchronized locking */ |
30 | bool sync_locking_done; | |
c4ce867f GR |
31 | void (*bast)(void *arg, int mode); /* blocking AST function pointer*/ |
32 | struct mddev *mddev; /* pointing back to mddev. */ | |
dbb64f86 | 33 | int mode; |
c4ce867f GR |
34 | }; |
35 | ||
96ae923a GR |
36 | struct suspend_info { |
37 | int slot; | |
38 | sector_t lo; | |
39 | sector_t hi; | |
40 | struct list_head list; | |
41 | }; | |
42 | ||
43 | struct resync_info { | |
44 | __le64 lo; | |
45 | __le64 hi; | |
46 | }; | |
47 | ||
fa8259da GR |
48 | /* md_cluster_info flags */ |
49 | #define MD_CLUSTER_WAITING_FOR_NEWDISK 1 | |
90382ed9 | 50 | #define MD_CLUSTER_SUSPEND_READ_BALANCING 2 |
eece075c | 51 | #define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3 |
fa8259da | 52 | |
8b9277c8 GJ |
53 | /* Lock the send communication. This is done through |
54 | * bit manipulation as opposed to a mutex in order to | |
55 | * accomodate lock and hold. See next comment. | |
56 | */ | |
57 | #define MD_CLUSTER_SEND_LOCK 4 | |
e19508fa GJ |
58 | /* If cluster operations (such as adding a disk) must lock the |
59 | * communication channel, so as to perform extra operations | |
60 | * (update metadata) and no other operation is allowed on the | |
61 | * MD. Token needs to be locked and held until the operation | |
62 | * completes witha md_update_sb(), which would eventually release | |
63 | * the lock. | |
8b9277c8 GJ |
64 | */ |
65 | #define MD_CLUSTER_SEND_LOCKED_ALREADY 5 | |
51e453ae GJ |
66 | /* We should receive message after node joined cluster and |
67 | * set up all the related infos such as bitmap and personality */ | |
68 | #define MD_CLUSTER_ALREADY_IN_CLUSTER 6 | |
69 | #define MD_CLUSTER_PENDING_RECV_EVENT 7 | |
0ba95977 | 70 | #define MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD 8 |
fa8259da | 71 | |
c4ce867f | 72 | struct md_cluster_info { |
0ba95977 | 73 | struct mddev *mddev; /* the md device which md_cluster_info belongs to */ |
c4ce867f GR |
74 | /* dlm lock space and resources for clustered raid. */ |
75 | dlm_lockspace_t *lockspace; | |
cf921cc1 GR |
76 | int slot_number; |
77 | struct completion completion; | |
8b9277c8 | 78 | struct mutex recv_mutex; |
54519c5f | 79 | struct dlm_lock_resource *bitmap_lockres; |
f6a2dc64 | 80 | struct dlm_lock_resource **other_bitmap_lockres; |
c186b128 | 81 | struct dlm_lock_resource *resync_lockres; |
96ae923a GR |
82 | struct list_head suspend_list; |
83 | spinlock_t suspend_lock; | |
e94987db GR |
84 | struct md_thread *recovery_thread; |
85 | unsigned long recovery_map; | |
4664680c GR |
86 | /* communication loc resources */ |
87 | struct dlm_lock_resource *ack_lockres; | |
88 | struct dlm_lock_resource *message_lockres; | |
89 | struct dlm_lock_resource *token_lockres; | |
1aee41f6 | 90 | struct dlm_lock_resource *no_new_dev_lockres; |
4664680c | 91 | struct md_thread *recv_thread; |
1aee41f6 | 92 | struct completion newdisk_completion; |
8b9277c8 | 93 | wait_queue_head_t wait; |
fa8259da | 94 | unsigned long state; |
18c9ff7f GJ |
95 | /* record the region in RESYNCING message */ |
96 | sector_t sync_low; | |
97 | sector_t sync_hi; | |
4664680c GR |
98 | }; |
99 | ||
100 | enum msg_type { | |
101 | METADATA_UPDATED = 0, | |
102 | RESYNCING, | |
1aee41f6 | 103 | NEWDISK, |
88bcfef7 | 104 | REMOVE, |
97f6cd39 | 105 | RE_ADD, |
dc737d7c | 106 | BITMAP_NEEDS_SYNC, |
7da3d203 | 107 | CHANGE_CAPACITY, |
4664680c GR |
108 | }; |
109 | ||
110 | struct cluster_msg { | |
cf97a348 GJ |
111 | __le32 type; |
112 | __le32 slot; | |
1aee41f6 | 113 | /* TODO: Unionize this for smaller footprint */ |
cf97a348 GJ |
114 | __le64 low; |
115 | __le64 high; | |
1aee41f6 | 116 | char uuid[16]; |
cf97a348 | 117 | __le32 raid_slot; |
47741b7c GR |
118 | }; |
119 | ||
120 | static void sync_ast(void *arg) | |
121 | { | |
122 | struct dlm_lock_resource *res; | |
123 | ||
2e2a7cd9 | 124 | res = arg; |
fccb60a4 GJ |
125 | res->sync_locking_done = true; |
126 | wake_up(&res->sync_locking); | |
47741b7c GR |
127 | } |
128 | ||
129 | static int dlm_lock_sync(struct dlm_lock_resource *res, int mode) | |
130 | { | |
131 | int ret = 0; | |
132 | ||
47741b7c GR |
133 | ret = dlm_lock(res->ls, mode, &res->lksb, |
134 | res->flags, res->name, strlen(res->name), | |
135 | 0, sync_ast, res, res->bast); | |
136 | if (ret) | |
137 | return ret; | |
fccb60a4 GJ |
138 | wait_event(res->sync_locking, res->sync_locking_done); |
139 | res->sync_locking_done = false; | |
dbb64f86 GR |
140 | if (res->lksb.sb_status == 0) |
141 | res->mode = mode; | |
47741b7c GR |
142 | return res->lksb.sb_status; |
143 | } | |
144 | ||
145 | static int dlm_unlock_sync(struct dlm_lock_resource *res) | |
146 | { | |
147 | return dlm_lock_sync(res, DLM_LOCK_NL); | |
148 | } | |
149 | ||
7bcda714 GJ |
150 | /* |
151 | * An variation of dlm_lock_sync, which make lock request could | |
152 | * be interrupted | |
153 | */ | |
154 | static int dlm_lock_sync_interruptible(struct dlm_lock_resource *res, int mode, | |
155 | struct mddev *mddev) | |
156 | { | |
157 | int ret = 0; | |
158 | ||
159 | ret = dlm_lock(res->ls, mode, &res->lksb, | |
160 | res->flags, res->name, strlen(res->name), | |
161 | 0, sync_ast, res, res->bast); | |
162 | if (ret) | |
163 | return ret; | |
164 | ||
165 | wait_event(res->sync_locking, res->sync_locking_done | |
d6385db9 GJ |
166 | || kthread_should_stop() |
167 | || test_bit(MD_CLOSING, &mddev->flags)); | |
7bcda714 GJ |
168 | if (!res->sync_locking_done) { |
169 | /* | |
170 | * the convert queue contains the lock request when request is | |
171 | * interrupted, and sync_ast could still be run, so need to | |
172 | * cancel the request and reset completion | |
173 | */ | |
174 | ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_CANCEL, | |
175 | &res->lksb, res); | |
176 | res->sync_locking_done = false; | |
177 | if (unlikely(ret != 0)) | |
178 | pr_info("failed to cancel previous lock request " | |
179 | "%s return %d\n", res->name, ret); | |
180 | return -EPERM; | |
181 | } else | |
182 | res->sync_locking_done = false; | |
183 | if (res->lksb.sb_status == 0) | |
184 | res->mode = mode; | |
185 | return res->lksb.sb_status; | |
186 | } | |
187 | ||
c4ce867f | 188 | static struct dlm_lock_resource *lockres_init(struct mddev *mddev, |
47741b7c GR |
189 | char *name, void (*bastfn)(void *arg, int mode), int with_lvb) |
190 | { | |
191 | struct dlm_lock_resource *res = NULL; | |
192 | int ret, namelen; | |
c4ce867f | 193 | struct md_cluster_info *cinfo = mddev->cluster_info; |
47741b7c GR |
194 | |
195 | res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL); | |
196 | if (!res) | |
197 | return NULL; | |
fccb60a4 GJ |
198 | init_waitqueue_head(&res->sync_locking); |
199 | res->sync_locking_done = false; | |
c4ce867f GR |
200 | res->ls = cinfo->lockspace; |
201 | res->mddev = mddev; | |
dbb64f86 | 202 | res->mode = DLM_LOCK_IV; |
47741b7c GR |
203 | namelen = strlen(name); |
204 | res->name = kzalloc(namelen + 1, GFP_KERNEL); | |
205 | if (!res->name) { | |
206 | pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name); | |
207 | goto out_err; | |
208 | } | |
209 | strlcpy(res->name, name, namelen + 1); | |
210 | if (with_lvb) { | |
211 | res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL); | |
212 | if (!res->lksb.sb_lvbptr) { | |
213 | pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name); | |
214 | goto out_err; | |
215 | } | |
216 | res->flags = DLM_LKF_VALBLK; | |
217 | } | |
218 | ||
219 | if (bastfn) | |
220 | res->bast = bastfn; | |
221 | ||
222 | res->flags |= DLM_LKF_EXPEDITE; | |
223 | ||
224 | ret = dlm_lock_sync(res, DLM_LOCK_NL); | |
225 | if (ret) { | |
226 | pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name); | |
227 | goto out_err; | |
228 | } | |
229 | res->flags &= ~DLM_LKF_EXPEDITE; | |
230 | res->flags |= DLM_LKF_CONVERT; | |
231 | ||
232 | return res; | |
233 | out_err: | |
234 | kfree(res->lksb.sb_lvbptr); | |
235 | kfree(res->name); | |
236 | kfree(res); | |
237 | return NULL; | |
238 | } | |
239 | ||
240 | static void lockres_free(struct dlm_lock_resource *res) | |
241 | { | |
400cb454 | 242 | int ret = 0; |
b5ef5678 | 243 | |
47741b7c GR |
244 | if (!res) |
245 | return; | |
246 | ||
400cb454 GJ |
247 | /* |
248 | * use FORCEUNLOCK flag, so we can unlock even the lock is on the | |
249 | * waiting or convert queue | |
250 | */ | |
251 | ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_FORCEUNLOCK, | |
252 | &res->lksb, res); | |
253 | if (unlikely(ret != 0)) | |
254 | pr_err("failed to unlock %s return %d\n", res->name, ret); | |
255 | else | |
fccb60a4 | 256 | wait_event(res->sync_locking, res->sync_locking_done); |
47741b7c GR |
257 | |
258 | kfree(res->name); | |
259 | kfree(res->lksb.sb_lvbptr); | |
260 | kfree(res); | |
261 | } | |
8e854e9c | 262 | |
30661b49 N |
263 | static void add_resync_info(struct dlm_lock_resource *lockres, |
264 | sector_t lo, sector_t hi) | |
96ae923a GR |
265 | { |
266 | struct resync_info *ri; | |
267 | ||
268 | ri = (struct resync_info *)lockres->lksb.sb_lvbptr; | |
269 | ri->lo = cpu_to_le64(lo); | |
270 | ri->hi = cpu_to_le64(hi); | |
271 | } | |
272 | ||
273 | static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres) | |
274 | { | |
275 | struct resync_info ri; | |
276 | struct suspend_info *s = NULL; | |
277 | sector_t hi = 0; | |
278 | ||
279 | dlm_lock_sync(lockres, DLM_LOCK_CR); | |
280 | memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); | |
281 | hi = le64_to_cpu(ri.hi); | |
cf97a348 | 282 | if (hi > 0) { |
96ae923a GR |
283 | s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); |
284 | if (!s) | |
285 | goto out; | |
286 | s->hi = hi; | |
287 | s->lo = le64_to_cpu(ri.lo); | |
288 | } | |
289 | dlm_unlock_sync(lockres); | |
290 | out: | |
291 | return s; | |
292 | } | |
293 | ||
6dc69c9c | 294 | static void recover_bitmaps(struct md_thread *thread) |
e94987db GR |
295 | { |
296 | struct mddev *mddev = thread->mddev; | |
297 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
298 | struct dlm_lock_resource *bm_lockres; | |
299 | char str[64]; | |
300 | int slot, ret; | |
301 | struct suspend_info *s, *tmp; | |
302 | sector_t lo, hi; | |
303 | ||
304 | while (cinfo->recovery_map) { | |
305 | slot = fls64((u64)cinfo->recovery_map) - 1; | |
306 | ||
307 | /* Clear suspend_area associated with the bitmap */ | |
308 | spin_lock_irq(&cinfo->suspend_lock); | |
309 | list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) | |
310 | if (slot == s->slot) { | |
311 | list_del(&s->list); | |
312 | kfree(s); | |
313 | } | |
314 | spin_unlock_irq(&cinfo->suspend_lock); | |
315 | ||
316 | snprintf(str, 64, "bitmap%04d", slot); | |
317 | bm_lockres = lockres_init(mddev, str, NULL, 1); | |
318 | if (!bm_lockres) { | |
319 | pr_err("md-cluster: Cannot initialize bitmaps\n"); | |
320 | goto clear_bit; | |
321 | } | |
322 | ||
7bcda714 | 323 | ret = dlm_lock_sync_interruptible(bm_lockres, DLM_LOCK_PW, mddev); |
e94987db GR |
324 | if (ret) { |
325 | pr_err("md-cluster: Could not DLM lock %s: %d\n", | |
326 | str, ret); | |
327 | goto clear_bit; | |
328 | } | |
97f6cd39 | 329 | ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true); |
4b26a08a | 330 | if (ret) { |
e94987db | 331 | pr_err("md-cluster: Could not copy data from bitmap %d\n", slot); |
e3f924d3 | 332 | goto clear_bit; |
4b26a08a GR |
333 | } |
334 | if (hi > 0) { | |
4b26a08a GR |
335 | if (lo < mddev->recovery_cp) |
336 | mddev->recovery_cp = lo; | |
eb315cd0 GJ |
337 | /* wake up thread to continue resync in case resync |
338 | * is not finished */ | |
339 | if (mddev->recovery_cp != MaxSector) { | |
340 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
341 | md_wakeup_thread(mddev->thread); | |
342 | } | |
4b26a08a | 343 | } |
e94987db | 344 | clear_bit: |
4ac7a65f | 345 | lockres_free(bm_lockres); |
e94987db GR |
346 | clear_bit(slot, &cinfo->recovery_map); |
347 | } | |
348 | } | |
349 | ||
cf921cc1 GR |
350 | static void recover_prep(void *arg) |
351 | { | |
90382ed9 GR |
352 | struct mddev *mddev = arg; |
353 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
354 | set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); | |
cf921cc1 GR |
355 | } |
356 | ||
05cd0e51 | 357 | static void __recover_slot(struct mddev *mddev, int slot) |
cf921cc1 | 358 | { |
cf921cc1 GR |
359 | struct md_cluster_info *cinfo = mddev->cluster_info; |
360 | ||
05cd0e51 | 361 | set_bit(slot, &cinfo->recovery_map); |
e94987db GR |
362 | if (!cinfo->recovery_thread) { |
363 | cinfo->recovery_thread = md_register_thread(recover_bitmaps, | |
364 | mddev, "recover"); | |
365 | if (!cinfo->recovery_thread) { | |
366 | pr_warn("md-cluster: Could not create recovery thread\n"); | |
367 | return; | |
368 | } | |
369 | } | |
370 | md_wakeup_thread(cinfo->recovery_thread); | |
cf921cc1 GR |
371 | } |
372 | ||
05cd0e51 GJ |
373 | static void recover_slot(void *arg, struct dlm_slot *slot) |
374 | { | |
375 | struct mddev *mddev = arg; | |
376 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
377 | ||
378 | pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n", | |
379 | mddev->bitmap_info.cluster_name, | |
380 | slot->nodeid, slot->slot, | |
381 | cinfo->slot_number); | |
382 | /* deduct one since dlm slot starts from one while the num of | |
383 | * cluster-md begins with 0 */ | |
384 | __recover_slot(mddev, slot->slot - 1); | |
385 | } | |
386 | ||
cf921cc1 GR |
387 | static void recover_done(void *arg, struct dlm_slot *slots, |
388 | int num_slots, int our_slot, | |
389 | uint32_t generation) | |
390 | { | |
391 | struct mddev *mddev = arg; | |
392 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
393 | ||
394 | cinfo->slot_number = our_slot; | |
eece075c GJ |
395 | /* completion is only need to be complete when node join cluster, |
396 | * it doesn't need to run during another node's failure */ | |
397 | if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) { | |
398 | complete(&cinfo->completion); | |
399 | clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state); | |
400 | } | |
90382ed9 | 401 | clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); |
cf921cc1 GR |
402 | } |
403 | ||
eece075c GJ |
404 | /* the ops is called when node join the cluster, and do lock recovery |
405 | * if node failure occurs */ | |
cf921cc1 GR |
406 | static const struct dlm_lockspace_ops md_ls_ops = { |
407 | .recover_prep = recover_prep, | |
408 | .recover_slot = recover_slot, | |
409 | .recover_done = recover_done, | |
410 | }; | |
411 | ||
4664680c GR |
412 | /* |
413 | * The BAST function for the ack lock resource | |
414 | * This function wakes up the receive thread in | |
415 | * order to receive and process the message. | |
416 | */ | |
417 | static void ack_bast(void *arg, int mode) | |
418 | { | |
2e2a7cd9 | 419 | struct dlm_lock_resource *res = arg; |
4664680c GR |
420 | struct md_cluster_info *cinfo = res->mddev->cluster_info; |
421 | ||
51e453ae GJ |
422 | if (mode == DLM_LOCK_EX) { |
423 | if (test_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state)) | |
424 | md_wakeup_thread(cinfo->recv_thread); | |
425 | else | |
426 | set_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state); | |
427 | } | |
4664680c GR |
428 | } |
429 | ||
e59721cc GR |
430 | static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot) |
431 | { | |
432 | struct suspend_info *s, *tmp; | |
433 | ||
434 | list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) | |
435 | if (slot == s->slot) { | |
e59721cc GR |
436 | list_del(&s->list); |
437 | kfree(s); | |
438 | break; | |
439 | } | |
440 | } | |
441 | ||
b8ca846e | 442 | static void remove_suspend_info(struct mddev *mddev, int slot) |
e59721cc | 443 | { |
b8ca846e | 444 | struct md_cluster_info *cinfo = mddev->cluster_info; |
e59721cc GR |
445 | spin_lock_irq(&cinfo->suspend_lock); |
446 | __remove_suspend_info(cinfo, slot); | |
447 | spin_unlock_irq(&cinfo->suspend_lock); | |
b8ca846e | 448 | mddev->pers->quiesce(mddev, 2); |
e59721cc GR |
449 | } |
450 | ||
451 | ||
9ed38ff5 | 452 | static void process_suspend_info(struct mddev *mddev, |
e59721cc GR |
453 | int slot, sector_t lo, sector_t hi) |
454 | { | |
9ed38ff5 | 455 | struct md_cluster_info *cinfo = mddev->cluster_info; |
e59721cc GR |
456 | struct suspend_info *s; |
457 | ||
458 | if (!hi) { | |
b8ca846e | 459 | remove_suspend_info(mddev, slot); |
c186b128 GR |
460 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
461 | md_wakeup_thread(mddev->thread); | |
e59721cc GR |
462 | return; |
463 | } | |
18c9ff7f GJ |
464 | |
465 | /* | |
466 | * The bitmaps are not same for different nodes | |
467 | * if RESYNCING is happening in one node, then | |
468 | * the node which received the RESYNCING message | |
469 | * probably will perform resync with the region | |
470 | * [lo, hi] again, so we could reduce resync time | |
471 | * a lot if we can ensure that the bitmaps among | |
472 | * different nodes are match up well. | |
473 | * | |
474 | * sync_low/hi is used to record the region which | |
475 | * arrived in the previous RESYNCING message, | |
476 | * | |
477 | * Call bitmap_sync_with_cluster to clear | |
478 | * NEEDED_MASK and set RESYNC_MASK since | |
479 | * resync thread is running in another node, | |
480 | * so we don't need to do the resync again | |
481 | * with the same section */ | |
482 | bitmap_sync_with_cluster(mddev, cinfo->sync_low, | |
483 | cinfo->sync_hi, | |
484 | lo, hi); | |
485 | cinfo->sync_low = lo; | |
486 | cinfo->sync_hi = hi; | |
487 | ||
e59721cc GR |
488 | s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); |
489 | if (!s) | |
490 | return; | |
491 | s->slot = slot; | |
492 | s->lo = lo; | |
493 | s->hi = hi; | |
9ed38ff5 GR |
494 | mddev->pers->quiesce(mddev, 1); |
495 | mddev->pers->quiesce(mddev, 0); | |
e59721cc GR |
496 | spin_lock_irq(&cinfo->suspend_lock); |
497 | /* Remove existing entry (if exists) before adding */ | |
498 | __remove_suspend_info(cinfo, slot); | |
499 | list_add(&s->list, &cinfo->suspend_list); | |
500 | spin_unlock_irq(&cinfo->suspend_lock); | |
b8ca846e | 501 | mddev->pers->quiesce(mddev, 2); |
e59721cc GR |
502 | } |
503 | ||
1aee41f6 GR |
504 | static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg) |
505 | { | |
506 | char disk_uuid[64]; | |
507 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
508 | char event_name[] = "EVENT=ADD_DEVICE"; | |
509 | char raid_slot[16]; | |
510 | char *envp[] = {event_name, disk_uuid, raid_slot, NULL}; | |
511 | int len; | |
512 | ||
513 | len = snprintf(disk_uuid, 64, "DEVICE_UUID="); | |
b89f704a | 514 | sprintf(disk_uuid + len, "%pU", cmsg->uuid); |
faeff83f | 515 | snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot)); |
1aee41f6 GR |
516 | pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot); |
517 | init_completion(&cinfo->newdisk_completion); | |
fa8259da | 518 | set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); |
1aee41f6 GR |
519 | kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp); |
520 | wait_for_completion_timeout(&cinfo->newdisk_completion, | |
521 | NEW_DEV_TIMEOUT); | |
fa8259da | 522 | clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); |
1aee41f6 GR |
523 | } |
524 | ||
525 | ||
526 | static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg) | |
527 | { | |
0ba95977 | 528 | int got_lock = 0; |
1aee41f6 | 529 | struct md_cluster_info *cinfo = mddev->cluster_info; |
15858fa5 | 530 | mddev->good_device_nr = le32_to_cpu(msg->raid_slot); |
0ba95977 | 531 | |
1aee41f6 | 532 | dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); |
0ba95977 GJ |
533 | wait_event(mddev->thread->wqueue, |
534 | (got_lock = mddev_trylock(mddev)) || | |
535 | test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state)); | |
536 | md_reload_sb(mddev, mddev->good_device_nr); | |
537 | if (got_lock) | |
538 | mddev_unlock(mddev); | |
1aee41f6 GR |
539 | } |
540 | ||
88bcfef7 GR |
541 | static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg) |
542 | { | |
5f0aa21d | 543 | struct md_rdev *rdev; |
88bcfef7 | 544 | |
5f0aa21d GJ |
545 | rcu_read_lock(); |
546 | rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot)); | |
659b254f GJ |
547 | if (rdev) { |
548 | set_bit(ClusterRemove, &rdev->flags); | |
549 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
550 | md_wakeup_thread(mddev->thread); | |
551 | } | |
88bcfef7 | 552 | else |
faeff83f GJ |
553 | pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", |
554 | __func__, __LINE__, le32_to_cpu(msg->raid_slot)); | |
5f0aa21d | 555 | rcu_read_unlock(); |
88bcfef7 GR |
556 | } |
557 | ||
97f6cd39 GR |
558 | static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg) |
559 | { | |
5f0aa21d | 560 | struct md_rdev *rdev; |
97f6cd39 | 561 | |
5f0aa21d GJ |
562 | rcu_read_lock(); |
563 | rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot)); | |
97f6cd39 GR |
564 | if (rdev && test_bit(Faulty, &rdev->flags)) |
565 | clear_bit(Faulty, &rdev->flags); | |
566 | else | |
faeff83f GJ |
567 | pr_warn("%s: %d Could not find disk(%d) which is faulty", |
568 | __func__, __LINE__, le32_to_cpu(msg->raid_slot)); | |
5f0aa21d | 569 | rcu_read_unlock(); |
97f6cd39 GR |
570 | } |
571 | ||
1fa9a1ad | 572 | static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) |
4664680c | 573 | { |
1fa9a1ad GJ |
574 | int ret = 0; |
575 | ||
256f5b24 GJ |
576 | if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot), |
577 | "node %d received it's own msg\n", le32_to_cpu(msg->slot))) | |
1fa9a1ad | 578 | return -1; |
cf97a348 | 579 | switch (le32_to_cpu(msg->type)) { |
4664680c | 580 | case METADATA_UPDATED: |
1aee41f6 | 581 | process_metadata_update(mddev, msg); |
4664680c | 582 | break; |
7da3d203 GJ |
583 | case CHANGE_CAPACITY: |
584 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
585 | revalidate_disk(mddev->gendisk); | |
586 | break; | |
4664680c | 587 | case RESYNCING: |
cf97a348 GJ |
588 | process_suspend_info(mddev, le32_to_cpu(msg->slot), |
589 | le64_to_cpu(msg->low), | |
590 | le64_to_cpu(msg->high)); | |
4664680c | 591 | break; |
1aee41f6 | 592 | case NEWDISK: |
1aee41f6 | 593 | process_add_new_disk(mddev, msg); |
88bcfef7 GR |
594 | break; |
595 | case REMOVE: | |
88bcfef7 GR |
596 | process_remove_disk(mddev, msg); |
597 | break; | |
97f6cd39 | 598 | case RE_ADD: |
97f6cd39 GR |
599 | process_readd_disk(mddev, msg); |
600 | break; | |
dc737d7c | 601 | case BITMAP_NEEDS_SYNC: |
cf97a348 | 602 | __recover_slot(mddev, le32_to_cpu(msg->slot)); |
dc737d7c | 603 | break; |
88bcfef7 | 604 | default: |
1fa9a1ad | 605 | ret = -1; |
88bcfef7 GR |
606 | pr_warn("%s:%d Received unknown message from %d\n", |
607 | __func__, __LINE__, msg->slot); | |
09dd1af2 | 608 | } |
1fa9a1ad | 609 | return ret; |
4664680c GR |
610 | } |
611 | ||
612 | /* | |
613 | * thread for receiving message | |
614 | */ | |
615 | static void recv_daemon(struct md_thread *thread) | |
616 | { | |
617 | struct md_cluster_info *cinfo = thread->mddev->cluster_info; | |
618 | struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres; | |
619 | struct dlm_lock_resource *message_lockres = cinfo->message_lockres; | |
620 | struct cluster_msg msg; | |
b5ef5678 | 621 | int ret; |
4664680c | 622 | |
8b9277c8 | 623 | mutex_lock(&cinfo->recv_mutex); |
4664680c GR |
624 | /*get CR on Message*/ |
625 | if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) { | |
626 | pr_err("md/raid1:failed to get CR on MESSAGE\n"); | |
8b9277c8 | 627 | mutex_unlock(&cinfo->recv_mutex); |
4664680c GR |
628 | return; |
629 | } | |
630 | ||
631 | /* read lvb and wake up thread to process this message_lockres */ | |
632 | memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg)); | |
1fa9a1ad GJ |
633 | ret = process_recvd_msg(thread->mddev, &msg); |
634 | if (ret) | |
635 | goto out; | |
4664680c GR |
636 | |
637 | /*release CR on ack_lockres*/ | |
b5ef5678 GJ |
638 | ret = dlm_unlock_sync(ack_lockres); |
639 | if (unlikely(ret != 0)) | |
640 | pr_info("unlock ack failed return %d\n", ret); | |
66099bb0 | 641 | /*up-convert to PR on message_lockres*/ |
b5ef5678 GJ |
642 | ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR); |
643 | if (unlikely(ret != 0)) | |
644 | pr_info("lock PR on msg failed return %d\n", ret); | |
4664680c | 645 | /*get CR on ack_lockres again*/ |
b5ef5678 GJ |
646 | ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR); |
647 | if (unlikely(ret != 0)) | |
648 | pr_info("lock CR on ack failed return %d\n", ret); | |
1fa9a1ad | 649 | out: |
4664680c | 650 | /*release CR on message_lockres*/ |
b5ef5678 GJ |
651 | ret = dlm_unlock_sync(message_lockres); |
652 | if (unlikely(ret != 0)) | |
653 | pr_info("unlock msg failed return %d\n", ret); | |
8b9277c8 | 654 | mutex_unlock(&cinfo->recv_mutex); |
4664680c GR |
655 | } |
656 | ||
8b9277c8 | 657 | /* lock_token() |
601b515c GR |
658 | * Takes the lock on the TOKEN lock resource so no other |
659 | * node can communicate while the operation is underway. | |
660 | */ | |
0ba95977 | 661 | static int lock_token(struct md_cluster_info *cinfo, bool mddev_locked) |
601b515c | 662 | { |
0ba95977 GJ |
663 | int error, set_bit = 0; |
664 | struct mddev *mddev = cinfo->mddev; | |
601b515c | 665 | |
0ba95977 GJ |
666 | /* |
667 | * If resync thread run after raid1d thread, then process_metadata_update | |
668 | * could not continue if raid1d held reconfig_mutex (and raid1d is blocked | |
669 | * since another node already got EX on Token and waitting the EX of Ack), | |
670 | * so let resync wake up thread in case flag is set. | |
671 | */ | |
672 | if (mddev_locked && !test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, | |
673 | &cinfo->state)) { | |
674 | error = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, | |
675 | &cinfo->state); | |
676 | WARN_ON_ONCE(error); | |
677 | md_wakeup_thread(mddev->thread); | |
678 | set_bit = 1; | |
679 | } | |
601b515c | 680 | error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); |
0ba95977 GJ |
681 | if (set_bit) |
682 | clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); | |
683 | ||
601b515c GR |
684 | if (error) |
685 | pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n", | |
686 | __func__, __LINE__, error); | |
8b9277c8 GJ |
687 | |
688 | /* Lock the receive sequence */ | |
689 | mutex_lock(&cinfo->recv_mutex); | |
601b515c GR |
690 | return error; |
691 | } | |
692 | ||
8b9277c8 GJ |
693 | /* lock_comm() |
694 | * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel. | |
695 | */ | |
0ba95977 | 696 | static int lock_comm(struct md_cluster_info *cinfo, bool mddev_locked) |
8b9277c8 GJ |
697 | { |
698 | wait_event(cinfo->wait, | |
699 | !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state)); | |
700 | ||
0ba95977 | 701 | return lock_token(cinfo, mddev_locked); |
8b9277c8 GJ |
702 | } |
703 | ||
601b515c GR |
704 | static void unlock_comm(struct md_cluster_info *cinfo) |
705 | { | |
dbb64f86 | 706 | WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX); |
8b9277c8 | 707 | mutex_unlock(&cinfo->recv_mutex); |
601b515c | 708 | dlm_unlock_sync(cinfo->token_lockres); |
8b9277c8 GJ |
709 | clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state); |
710 | wake_up(&cinfo->wait); | |
601b515c GR |
711 | } |
712 | ||
713 | /* __sendmsg() | |
714 | * This function performs the actual sending of the message. This function is | |
715 | * usually called after performing the encompassing operation | |
716 | * The function: | |
717 | * 1. Grabs the message lockresource in EX mode | |
718 | * 2. Copies the message to the message LVB | |
66099bb0 | 719 | * 3. Downconverts message lockresource to CW |
601b515c GR |
720 | * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes |
721 | * and the other nodes read the message. The thread will wait here until all other | |
722 | * nodes have released ack lock resource. | |
723 | * 5. Downconvert ack lockresource to CR | |
724 | */ | |
725 | static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) | |
726 | { | |
727 | int error; | |
728 | int slot = cinfo->slot_number - 1; | |
729 | ||
730 | cmsg->slot = cpu_to_le32(slot); | |
731 | /*get EX on Message*/ | |
732 | error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX); | |
733 | if (error) { | |
734 | pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error); | |
735 | goto failed_message; | |
736 | } | |
737 | ||
738 | memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg, | |
739 | sizeof(struct cluster_msg)); | |
66099bb0 GJ |
740 | /*down-convert EX to CW on Message*/ |
741 | error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW); | |
601b515c | 742 | if (error) { |
66099bb0 | 743 | pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n", |
601b515c | 744 | error); |
66099bb0 | 745 | goto failed_ack; |
601b515c GR |
746 | } |
747 | ||
748 | /*up-convert CR to EX on Ack*/ | |
749 | error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX); | |
750 | if (error) { | |
751 | pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n", | |
752 | error); | |
753 | goto failed_ack; | |
754 | } | |
755 | ||
756 | /*down-convert EX to CR on Ack*/ | |
757 | error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR); | |
758 | if (error) { | |
759 | pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n", | |
760 | error); | |
761 | goto failed_ack; | |
762 | } | |
763 | ||
764 | failed_ack: | |
b5ef5678 GJ |
765 | error = dlm_unlock_sync(cinfo->message_lockres); |
766 | if (unlikely(error != 0)) { | |
767 | pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n", | |
768 | error); | |
769 | /* in case the message can't be released due to some reason */ | |
770 | goto failed_ack; | |
771 | } | |
601b515c GR |
772 | failed_message: |
773 | return error; | |
774 | } | |
775 | ||
0ba95977 GJ |
776 | static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg, |
777 | bool mddev_locked) | |
601b515c GR |
778 | { |
779 | int ret; | |
780 | ||
0ba95977 | 781 | lock_comm(cinfo, mddev_locked); |
601b515c GR |
782 | ret = __sendmsg(cinfo, cmsg); |
783 | unlock_comm(cinfo); | |
784 | return ret; | |
785 | } | |
786 | ||
96ae923a GR |
787 | static int gather_all_resync_info(struct mddev *mddev, int total_slots) |
788 | { | |
789 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
790 | int i, ret = 0; | |
791 | struct dlm_lock_resource *bm_lockres; | |
792 | struct suspend_info *s; | |
793 | char str[64]; | |
abb9b22a | 794 | sector_t lo, hi; |
96ae923a GR |
795 | |
796 | ||
797 | for (i = 0; i < total_slots; i++) { | |
798 | memset(str, '\0', 64); | |
799 | snprintf(str, 64, "bitmap%04d", i); | |
800 | bm_lockres = lockres_init(mddev, str, NULL, 1); | |
801 | if (!bm_lockres) | |
802 | return -ENOMEM; | |
4ac7a65f SL |
803 | if (i == (cinfo->slot_number - 1)) { |
804 | lockres_free(bm_lockres); | |
96ae923a | 805 | continue; |
4ac7a65f | 806 | } |
96ae923a GR |
807 | |
808 | bm_lockres->flags |= DLM_LKF_NOQUEUE; | |
809 | ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); | |
810 | if (ret == -EAGAIN) { | |
96ae923a GR |
811 | s = read_resync_info(mddev, bm_lockres); |
812 | if (s) { | |
813 | pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n", | |
814 | __func__, __LINE__, | |
815 | (unsigned long long) s->lo, | |
816 | (unsigned long long) s->hi, i); | |
817 | spin_lock_irq(&cinfo->suspend_lock); | |
818 | s->slot = i; | |
819 | list_add(&s->list, &cinfo->suspend_list); | |
820 | spin_unlock_irq(&cinfo->suspend_lock); | |
821 | } | |
822 | ret = 0; | |
823 | lockres_free(bm_lockres); | |
824 | continue; | |
825 | } | |
6e6d9f2c GJ |
826 | if (ret) { |
827 | lockres_free(bm_lockres); | |
96ae923a | 828 | goto out; |
6e6d9f2c | 829 | } |
abb9b22a GJ |
830 | |
831 | /* Read the disk bitmap sb and check if it needs recovery */ | |
832 | ret = bitmap_copy_from_slot(mddev, i, &lo, &hi, false); | |
833 | if (ret) { | |
834 | pr_warn("md-cluster: Could not gather bitmaps from slot %d", i); | |
835 | lockres_free(bm_lockres); | |
836 | continue; | |
837 | } | |
838 | if ((hi > 0) && (lo < mddev->recovery_cp)) { | |
839 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
840 | mddev->recovery_cp = lo; | |
841 | md_check_recovery(mddev); | |
842 | } | |
843 | ||
96ae923a GR |
844 | lockres_free(bm_lockres); |
845 | } | |
846 | out: | |
847 | return ret; | |
848 | } | |
849 | ||
edb39c9d GR |
850 | static int join(struct mddev *mddev, int nodes) |
851 | { | |
c4ce867f | 852 | struct md_cluster_info *cinfo; |
cf921cc1 | 853 | int ret, ops_rv; |
c4ce867f GR |
854 | char str[64]; |
855 | ||
c4ce867f GR |
856 | cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL); |
857 | if (!cinfo) | |
858 | return -ENOMEM; | |
859 | ||
9e3072e3 GJ |
860 | INIT_LIST_HEAD(&cinfo->suspend_list); |
861 | spin_lock_init(&cinfo->suspend_lock); | |
cf921cc1 | 862 | init_completion(&cinfo->completion); |
eece075c | 863 | set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state); |
8b9277c8 GJ |
864 | init_waitqueue_head(&cinfo->wait); |
865 | mutex_init(&cinfo->recv_mutex); | |
cf921cc1 | 866 | |
cf921cc1 | 867 | mddev->cluster_info = cinfo; |
0ba95977 | 868 | cinfo->mddev = mddev; |
cf921cc1 | 869 | |
c4ce867f | 870 | memset(str, 0, 64); |
b89f704a | 871 | sprintf(str, "%pU", mddev->uuid); |
cf921cc1 GR |
872 | ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name, |
873 | DLM_LSFL_FS, LVB_SIZE, | |
874 | &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace); | |
c4ce867f GR |
875 | if (ret) |
876 | goto err; | |
cf921cc1 | 877 | wait_for_completion(&cinfo->completion); |
8c58f02e GJ |
878 | if (nodes < cinfo->slot_number) { |
879 | pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).", | |
880 | cinfo->slot_number, nodes); | |
b97e9257 GR |
881 | ret = -ERANGE; |
882 | goto err; | |
883 | } | |
4664680c GR |
884 | /* Initiate the communication resources */ |
885 | ret = -ENOMEM; | |
886 | cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv"); | |
887 | if (!cinfo->recv_thread) { | |
888 | pr_err("md-cluster: cannot allocate memory for recv_thread!\n"); | |
889 | goto err; | |
890 | } | |
891 | cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1); | |
892 | if (!cinfo->message_lockres) | |
893 | goto err; | |
894 | cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0); | |
895 | if (!cinfo->token_lockres) | |
896 | goto err; | |
1aee41f6 GR |
897 | cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0); |
898 | if (!cinfo->no_new_dev_lockres) | |
899 | goto err; | |
900 | ||
1535212c GJ |
901 | ret = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); |
902 | if (ret) { | |
903 | ret = -EAGAIN; | |
904 | pr_err("md-cluster: can't join cluster to avoid lock issue\n"); | |
905 | goto err; | |
906 | } | |
907 | cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0); | |
0f6187db WY |
908 | if (!cinfo->ack_lockres) { |
909 | ret = -ENOMEM; | |
1535212c | 910 | goto err; |
0f6187db | 911 | } |
4664680c GR |
912 | /* get sync CR lock on ACK. */ |
913 | if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR)) | |
914 | pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n", | |
915 | ret); | |
1535212c | 916 | dlm_unlock_sync(cinfo->token_lockres); |
1aee41f6 GR |
917 | /* get sync CR lock on no-new-dev. */ |
918 | if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR)) | |
919 | pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret); | |
920 | ||
54519c5f GR |
921 | |
922 | pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number); | |
923 | snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1); | |
924 | cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1); | |
0f6187db WY |
925 | if (!cinfo->bitmap_lockres) { |
926 | ret = -ENOMEM; | |
54519c5f | 927 | goto err; |
0f6187db | 928 | } |
54519c5f GR |
929 | if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) { |
930 | pr_err("Failed to get bitmap lock\n"); | |
931 | ret = -EINVAL; | |
932 | goto err; | |
933 | } | |
934 | ||
c186b128 | 935 | cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0); |
0f6187db WY |
936 | if (!cinfo->resync_lockres) { |
937 | ret = -ENOMEM; | |
c186b128 | 938 | goto err; |
0f6187db | 939 | } |
c186b128 | 940 | |
edb39c9d | 941 | return 0; |
c4ce867f | 942 | err: |
0ba95977 | 943 | set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
5b0fb33e GJ |
944 | md_unregister_thread(&cinfo->recovery_thread); |
945 | md_unregister_thread(&cinfo->recv_thread); | |
4664680c GR |
946 | lockres_free(cinfo->message_lockres); |
947 | lockres_free(cinfo->token_lockres); | |
948 | lockres_free(cinfo->ack_lockres); | |
1aee41f6 | 949 | lockres_free(cinfo->no_new_dev_lockres); |
c186b128 | 950 | lockres_free(cinfo->resync_lockres); |
96ae923a | 951 | lockres_free(cinfo->bitmap_lockres); |
c4ce867f GR |
952 | if (cinfo->lockspace) |
953 | dlm_release_lockspace(cinfo->lockspace, 2); | |
cf921cc1 | 954 | mddev->cluster_info = NULL; |
c4ce867f | 955 | kfree(cinfo); |
c4ce867f | 956 | return ret; |
edb39c9d GR |
957 | } |
958 | ||
51e453ae GJ |
959 | static void load_bitmaps(struct mddev *mddev, int total_slots) |
960 | { | |
961 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
962 | ||
963 | /* load all the node's bitmap info for resync */ | |
964 | if (gather_all_resync_info(mddev, total_slots)) | |
965 | pr_err("md-cluster: failed to gather all resyn infos\n"); | |
966 | set_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state); | |
967 | /* wake up recv thread in case something need to be handled */ | |
968 | if (test_and_clear_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state)) | |
969 | md_wakeup_thread(cinfo->recv_thread); | |
970 | } | |
971 | ||
09995411 GJ |
972 | static void resync_bitmap(struct mddev *mddev) |
973 | { | |
974 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
975 | struct cluster_msg cmsg = {0}; | |
976 | int err; | |
977 | ||
978 | cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC); | |
0ba95977 | 979 | err = sendmsg(cinfo, &cmsg, 1); |
09995411 GJ |
980 | if (err) |
981 | pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n", | |
982 | __func__, __LINE__, err); | |
983 | } | |
984 | ||
f6a2dc64 | 985 | static void unlock_all_bitmaps(struct mddev *mddev); |
edb39c9d GR |
986 | static int leave(struct mddev *mddev) |
987 | { | |
c4ce867f GR |
988 | struct md_cluster_info *cinfo = mddev->cluster_info; |
989 | ||
990 | if (!cinfo) | |
991 | return 0; | |
09995411 GJ |
992 | |
993 | /* BITMAP_NEEDS_SYNC message should be sent when node | |
994 | * is leaving the cluster with dirty bitmap, also we | |
995 | * can only deliver it when dlm connection is available */ | |
996 | if (cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector) | |
997 | resync_bitmap(mddev); | |
998 | ||
0ba95977 | 999 | set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); |
e94987db | 1000 | md_unregister_thread(&cinfo->recovery_thread); |
4664680c GR |
1001 | md_unregister_thread(&cinfo->recv_thread); |
1002 | lockres_free(cinfo->message_lockres); | |
1003 | lockres_free(cinfo->token_lockres); | |
1004 | lockres_free(cinfo->ack_lockres); | |
1aee41f6 | 1005 | lockres_free(cinfo->no_new_dev_lockres); |
4ac7a65f | 1006 | lockres_free(cinfo->resync_lockres); |
54519c5f | 1007 | lockres_free(cinfo->bitmap_lockres); |
f6a2dc64 | 1008 | unlock_all_bitmaps(mddev); |
c4ce867f | 1009 | dlm_release_lockspace(cinfo->lockspace, 2); |
9c8043f3 | 1010 | kfree(cinfo); |
edb39c9d GR |
1011 | return 0; |
1012 | } | |
1013 | ||
cf921cc1 GR |
1014 | /* slot_number(): Returns the MD slot number to use |
1015 | * DLM starts the slot numbers from 1, wheras cluster-md | |
1016 | * wants the number to be from zero, so we deduct one | |
1017 | */ | |
1018 | static int slot_number(struct mddev *mddev) | |
1019 | { | |
1020 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1021 | ||
1022 | return cinfo->slot_number - 1; | |
1023 | } | |
1024 | ||
8b9277c8 GJ |
1025 | /* |
1026 | * Check if the communication is already locked, else lock the communication | |
1027 | * channel. | |
1028 | * If it is already locked, token is in EX mode, and hence lock_token() | |
1029 | * should not be called. | |
1030 | */ | |
293467aa GR |
1031 | static int metadata_update_start(struct mddev *mddev) |
1032 | { | |
8b9277c8 | 1033 | struct md_cluster_info *cinfo = mddev->cluster_info; |
0ba95977 GJ |
1034 | int ret; |
1035 | ||
1036 | /* | |
1037 | * metadata_update_start is always called with the protection of | |
1038 | * reconfig_mutex, so set WAITING_FOR_TOKEN here. | |
1039 | */ | |
1040 | ret = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, | |
1041 | &cinfo->state); | |
1042 | WARN_ON_ONCE(ret); | |
1043 | md_wakeup_thread(mddev->thread); | |
8b9277c8 GJ |
1044 | |
1045 | wait_event(cinfo->wait, | |
1046 | !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) || | |
1047 | test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state)); | |
1048 | ||
1049 | /* If token is already locked, return 0 */ | |
0ba95977 GJ |
1050 | if (cinfo->token_lockres->mode == DLM_LOCK_EX) { |
1051 | clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); | |
8b9277c8 | 1052 | return 0; |
0ba95977 | 1053 | } |
8b9277c8 | 1054 | |
0ba95977 GJ |
1055 | ret = lock_token(cinfo, 1); |
1056 | clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state); | |
1057 | return ret; | |
293467aa GR |
1058 | } |
1059 | ||
1060 | static int metadata_update_finish(struct mddev *mddev) | |
1061 | { | |
1062 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1063 | struct cluster_msg cmsg; | |
70bcecdb GR |
1064 | struct md_rdev *rdev; |
1065 | int ret = 0; | |
ba2746b0 | 1066 | int raid_slot = -1; |
293467aa GR |
1067 | |
1068 | memset(&cmsg, 0, sizeof(cmsg)); | |
1069 | cmsg.type = cpu_to_le32(METADATA_UPDATED); | |
70bcecdb GR |
1070 | /* Pick up a good active device number to send. |
1071 | */ | |
1072 | rdev_for_each(rdev, mddev) | |
1073 | if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) { | |
ba2746b0 | 1074 | raid_slot = rdev->desc_nr; |
70bcecdb GR |
1075 | break; |
1076 | } | |
ba2746b0 N |
1077 | if (raid_slot >= 0) { |
1078 | cmsg.raid_slot = cpu_to_le32(raid_slot); | |
70bcecdb | 1079 | ret = __sendmsg(cinfo, &cmsg); |
ba2746b0 | 1080 | } else |
70bcecdb | 1081 | pr_warn("md-cluster: No good device id found to send\n"); |
8b9277c8 | 1082 | clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
293467aa GR |
1083 | unlock_comm(cinfo); |
1084 | return ret; | |
1085 | } | |
1086 | ||
dbb64f86 | 1087 | static void metadata_update_cancel(struct mddev *mddev) |
293467aa GR |
1088 | { |
1089 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
8b9277c8 | 1090 | clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
dbb64f86 | 1091 | unlock_comm(cinfo); |
293467aa GR |
1092 | } |
1093 | ||
b98938d1 GJ |
1094 | /* |
1095 | * return 0 if all the bitmaps have the same sync_size | |
1096 | */ | |
1097 | int cluster_check_sync_size(struct mddev *mddev) | |
1098 | { | |
1099 | int i, rv; | |
1100 | bitmap_super_t *sb; | |
1101 | unsigned long my_sync_size, sync_size = 0; | |
1102 | int node_num = mddev->bitmap_info.nodes; | |
1103 | int current_slot = md_cluster_ops->slot_number(mddev); | |
1104 | struct bitmap *bitmap = mddev->bitmap; | |
1105 | char str[64]; | |
1106 | struct dlm_lock_resource *bm_lockres; | |
1107 | ||
1108 | sb = kmap_atomic(bitmap->storage.sb_page); | |
1109 | my_sync_size = sb->sync_size; | |
1110 | kunmap_atomic(sb); | |
1111 | ||
1112 | for (i = 0; i < node_num; i++) { | |
1113 | if (i == current_slot) | |
1114 | continue; | |
1115 | ||
1116 | bitmap = get_bitmap_from_slot(mddev, i); | |
1117 | if (IS_ERR(bitmap)) { | |
1118 | pr_err("can't get bitmap from slot %d\n", i); | |
1119 | return -1; | |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * If we can hold the bitmap lock of one node then | |
1124 | * the slot is not occupied, update the sb. | |
1125 | */ | |
1126 | snprintf(str, 64, "bitmap%04d", i); | |
1127 | bm_lockres = lockres_init(mddev, str, NULL, 1); | |
1128 | if (!bm_lockres) { | |
1129 | pr_err("md-cluster: Cannot initialize %s\n", str); | |
835d89e9 | 1130 | bitmap_free(bitmap); |
b98938d1 GJ |
1131 | return -1; |
1132 | } | |
1133 | bm_lockres->flags |= DLM_LKF_NOQUEUE; | |
1134 | rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); | |
1135 | if (!rv) | |
1136 | bitmap_update_sb(bitmap); | |
1137 | lockres_free(bm_lockres); | |
1138 | ||
1139 | sb = kmap_atomic(bitmap->storage.sb_page); | |
1140 | if (sync_size == 0) | |
1141 | sync_size = sb->sync_size; | |
1142 | else if (sync_size != sb->sync_size) { | |
1143 | kunmap_atomic(sb); | |
1144 | bitmap_free(bitmap); | |
1145 | return -1; | |
1146 | } | |
1147 | kunmap_atomic(sb); | |
1148 | bitmap_free(bitmap); | |
1149 | } | |
1150 | ||
1151 | return (my_sync_size == sync_size) ? 0 : -1; | |
1152 | } | |
1153 | ||
818da59f GJ |
1154 | /* |
1155 | * Update the size for cluster raid is a little more complex, we perform it | |
1156 | * by the steps: | |
1157 | * 1. hold token lock and update superblock in initiator node. | |
1158 | * 2. send METADATA_UPDATED msg to other nodes. | |
1159 | * 3. The initiator node continues to check each bitmap's sync_size, if all | |
1160 | * bitmaps have the same value of sync_size, then we can set capacity and | |
1161 | * let other nodes to perform it. If one node can't update sync_size | |
1162 | * accordingly, we need to revert to previous value. | |
1163 | */ | |
1164 | static void update_size(struct mddev *mddev, sector_t old_dev_sectors) | |
1165 | { | |
1166 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1167 | struct cluster_msg cmsg; | |
1168 | struct md_rdev *rdev; | |
1169 | int ret = 0; | |
1170 | int raid_slot = -1; | |
1171 | ||
1172 | md_update_sb(mddev, 1); | |
1173 | lock_comm(cinfo, 1); | |
1174 | ||
1175 | memset(&cmsg, 0, sizeof(cmsg)); | |
1176 | cmsg.type = cpu_to_le32(METADATA_UPDATED); | |
1177 | rdev_for_each(rdev, mddev) | |
1178 | if (rdev->raid_disk >= 0 && !test_bit(Faulty, &rdev->flags)) { | |
1179 | raid_slot = rdev->desc_nr; | |
1180 | break; | |
1181 | } | |
1182 | if (raid_slot >= 0) { | |
1183 | cmsg.raid_slot = cpu_to_le32(raid_slot); | |
1184 | /* | |
1185 | * We can only change capiticy after all the nodes can do it, | |
1186 | * so need to wait after other nodes already received the msg | |
1187 | * and handled the change | |
1188 | */ | |
1189 | ret = __sendmsg(cinfo, &cmsg); | |
1190 | if (ret) { | |
1191 | pr_err("%s:%d: failed to send METADATA_UPDATED msg\n", | |
1192 | __func__, __LINE__); | |
1193 | unlock_comm(cinfo); | |
1194 | return; | |
1195 | } | |
1196 | } else { | |
1197 | pr_err("md-cluster: No good device id found to send\n"); | |
1198 | unlock_comm(cinfo); | |
1199 | return; | |
1200 | } | |
1201 | ||
1202 | /* | |
1203 | * check the sync_size from other node's bitmap, if sync_size | |
1204 | * have already updated in other nodes as expected, send an | |
1205 | * empty metadata msg to permit the change of capacity | |
1206 | */ | |
1207 | if (cluster_check_sync_size(mddev) == 0) { | |
1208 | memset(&cmsg, 0, sizeof(cmsg)); | |
1209 | cmsg.type = cpu_to_le32(CHANGE_CAPACITY); | |
1210 | ret = __sendmsg(cinfo, &cmsg); | |
1211 | if (ret) | |
1212 | pr_err("%s:%d: failed to send CHANGE_CAPACITY msg\n", | |
1213 | __func__, __LINE__); | |
1214 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
1215 | revalidate_disk(mddev->gendisk); | |
1216 | } else { | |
1217 | /* revert to previous sectors */ | |
1218 | ret = mddev->pers->resize(mddev, old_dev_sectors); | |
1219 | if (!ret) | |
1220 | revalidate_disk(mddev->gendisk); | |
1221 | ret = __sendmsg(cinfo, &cmsg); | |
1222 | if (ret) | |
1223 | pr_err("%s:%d: failed to send METADATA_UPDATED msg\n", | |
1224 | __func__, __LINE__); | |
1225 | } | |
1226 | unlock_comm(cinfo); | |
1227 | } | |
1228 | ||
c186b128 GR |
1229 | static int resync_start(struct mddev *mddev) |
1230 | { | |
1231 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
d6385db9 | 1232 | return dlm_lock_sync_interruptible(cinfo->resync_lockres, DLM_LOCK_EX, mddev); |
c186b128 GR |
1233 | } |
1234 | ||
c40f341f | 1235 | static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi) |
965400eb GR |
1236 | { |
1237 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
ac277c6a | 1238 | struct resync_info ri; |
aee177ac | 1239 | struct cluster_msg cmsg = {0}; |
965400eb | 1240 | |
ac277c6a GR |
1241 | /* do not send zero again, if we have sent before */ |
1242 | if (hi == 0) { | |
1243 | memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); | |
1244 | if (le64_to_cpu(ri.hi) == 0) | |
1245 | return 0; | |
1246 | } | |
1247 | ||
30661b49 | 1248 | add_resync_info(cinfo->bitmap_lockres, lo, hi); |
c40f341f GR |
1249 | /* Re-acquire the lock to refresh LVB */ |
1250 | dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW); | |
c40f341f | 1251 | cmsg.type = cpu_to_le32(RESYNCING); |
965400eb GR |
1252 | cmsg.low = cpu_to_le64(lo); |
1253 | cmsg.high = cpu_to_le64(hi); | |
c186b128 | 1254 | |
0ba95977 GJ |
1255 | /* |
1256 | * mddev_lock is held if resync_info_update is called from | |
1257 | * resync_finish (md_reap_sync_thread -> resync_finish) | |
1258 | */ | |
1259 | if (lo == 0 && hi == 0) | |
1260 | return sendmsg(cinfo, &cmsg, 1); | |
1261 | else | |
1262 | return sendmsg(cinfo, &cmsg, 0); | |
965400eb GR |
1263 | } |
1264 | ||
c186b128 GR |
1265 | static int resync_finish(struct mddev *mddev) |
1266 | { | |
1267 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
c186b128 GR |
1268 | dlm_unlock_sync(cinfo->resync_lockres); |
1269 | return resync_info_update(mddev, 0, 0); | |
1270 | } | |
1271 | ||
90382ed9 GR |
1272 | static int area_resyncing(struct mddev *mddev, int direction, |
1273 | sector_t lo, sector_t hi) | |
589a1c49 GR |
1274 | { |
1275 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1276 | int ret = 0; | |
1277 | struct suspend_info *s; | |
1278 | ||
90382ed9 GR |
1279 | if ((direction == READ) && |
1280 | test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state)) | |
1281 | return 1; | |
1282 | ||
589a1c49 GR |
1283 | spin_lock_irq(&cinfo->suspend_lock); |
1284 | if (list_empty(&cinfo->suspend_list)) | |
1285 | goto out; | |
1286 | list_for_each_entry(s, &cinfo->suspend_list, list) | |
1287 | if (hi > s->lo && lo < s->hi) { | |
1288 | ret = 1; | |
1289 | break; | |
1290 | } | |
1291 | out: | |
1292 | spin_unlock_irq(&cinfo->suspend_lock); | |
1293 | return ret; | |
1294 | } | |
1295 | ||
dbb64f86 GR |
1296 | /* add_new_disk() - initiates a disk add |
1297 | * However, if this fails before writing md_update_sb(), | |
1298 | * add_new_disk_cancel() must be called to release token lock | |
1299 | */ | |
1300 | static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev) | |
1aee41f6 GR |
1301 | { |
1302 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1303 | struct cluster_msg cmsg; | |
1304 | int ret = 0; | |
1305 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); | |
1306 | char *uuid = sb->device_uuid; | |
1307 | ||
1308 | memset(&cmsg, 0, sizeof(cmsg)); | |
1309 | cmsg.type = cpu_to_le32(NEWDISK); | |
1310 | memcpy(cmsg.uuid, uuid, 16); | |
faeff83f | 1311 | cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); |
0ba95977 | 1312 | lock_comm(cinfo, 1); |
1aee41f6 | 1313 | ret = __sendmsg(cinfo, &cmsg); |
2dffdc07 GJ |
1314 | if (ret) { |
1315 | unlock_comm(cinfo); | |
1aee41f6 | 1316 | return ret; |
2dffdc07 | 1317 | } |
1aee41f6 GR |
1318 | cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE; |
1319 | ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX); | |
1320 | cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE; | |
1321 | /* Some node does not "see" the device */ | |
1322 | if (ret == -EAGAIN) | |
1323 | ret = -ENOENT; | |
dbb64f86 GR |
1324 | if (ret) |
1325 | unlock_comm(cinfo); | |
8b9277c8 | 1326 | else { |
1aee41f6 | 1327 | dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); |
e19508fa GJ |
1328 | /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which |
1329 | * will run soon after add_new_disk, the below path will be | |
1330 | * invoked: | |
1331 | * md_wakeup_thread(mddev->thread) | |
1332 | * -> conf->thread (raid1d) | |
1333 | * -> md_check_recovery -> md_update_sb | |
1334 | * -> metadata_update_start/finish | |
1335 | * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually. | |
1336 | * | |
1337 | * For other failure cases, metadata_update_cancel and | |
1338 | * add_new_disk_cancel also clear below bit as well. | |
1339 | * */ | |
8b9277c8 GJ |
1340 | set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
1341 | wake_up(&cinfo->wait); | |
1342 | } | |
1aee41f6 GR |
1343 | return ret; |
1344 | } | |
1345 | ||
dbb64f86 | 1346 | static void add_new_disk_cancel(struct mddev *mddev) |
1aee41f6 | 1347 | { |
dbb64f86 | 1348 | struct md_cluster_info *cinfo = mddev->cluster_info; |
8b9277c8 | 1349 | clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state); |
dbb64f86 | 1350 | unlock_comm(cinfo); |
1aee41f6 GR |
1351 | } |
1352 | ||
fa8259da | 1353 | static int new_disk_ack(struct mddev *mddev, bool ack) |
1aee41f6 GR |
1354 | { |
1355 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1356 | ||
fa8259da GR |
1357 | if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) { |
1358 | pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev)); | |
1359 | return -EINVAL; | |
1360 | } | |
1361 | ||
1aee41f6 GR |
1362 | if (ack) |
1363 | dlm_unlock_sync(cinfo->no_new_dev_lockres); | |
1364 | complete(&cinfo->newdisk_completion); | |
fa8259da | 1365 | return 0; |
1aee41f6 GR |
1366 | } |
1367 | ||
88bcfef7 GR |
1368 | static int remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
1369 | { | |
aee177ac | 1370 | struct cluster_msg cmsg = {0}; |
88bcfef7 | 1371 | struct md_cluster_info *cinfo = mddev->cluster_info; |
faeff83f GJ |
1372 | cmsg.type = cpu_to_le32(REMOVE); |
1373 | cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); | |
0ba95977 | 1374 | return sendmsg(cinfo, &cmsg, 1); |
88bcfef7 GR |
1375 | } |
1376 | ||
f6a2dc64 GJ |
1377 | static int lock_all_bitmaps(struct mddev *mddev) |
1378 | { | |
1379 | int slot, my_slot, ret, held = 1, i = 0; | |
1380 | char str[64]; | |
1381 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1382 | ||
1383 | cinfo->other_bitmap_lockres = kzalloc((mddev->bitmap_info.nodes - 1) * | |
1384 | sizeof(struct dlm_lock_resource *), | |
1385 | GFP_KERNEL); | |
1386 | if (!cinfo->other_bitmap_lockres) { | |
1387 | pr_err("md: can't alloc mem for other bitmap locks\n"); | |
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | my_slot = slot_number(mddev); | |
1392 | for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) { | |
1393 | if (slot == my_slot) | |
1394 | continue; | |
1395 | ||
1396 | memset(str, '\0', 64); | |
1397 | snprintf(str, 64, "bitmap%04d", slot); | |
1398 | cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1); | |
1399 | if (!cinfo->other_bitmap_lockres[i]) | |
1400 | return -ENOMEM; | |
1401 | ||
1402 | cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE; | |
1403 | ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW); | |
1404 | if (ret) | |
1405 | held = -1; | |
1406 | i++; | |
1407 | } | |
1408 | ||
1409 | return held; | |
1410 | } | |
1411 | ||
1412 | static void unlock_all_bitmaps(struct mddev *mddev) | |
1413 | { | |
1414 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1415 | int i; | |
1416 | ||
1417 | /* release other node's bitmap lock if they are existed */ | |
1418 | if (cinfo->other_bitmap_lockres) { | |
1419 | for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) { | |
1420 | if (cinfo->other_bitmap_lockres[i]) { | |
f6a2dc64 GJ |
1421 | lockres_free(cinfo->other_bitmap_lockres[i]); |
1422 | } | |
1423 | } | |
1424 | kfree(cinfo->other_bitmap_lockres); | |
1425 | } | |
1426 | } | |
1427 | ||
97f6cd39 GR |
1428 | static int gather_bitmaps(struct md_rdev *rdev) |
1429 | { | |
1430 | int sn, err; | |
1431 | sector_t lo, hi; | |
aee177ac | 1432 | struct cluster_msg cmsg = {0}; |
97f6cd39 GR |
1433 | struct mddev *mddev = rdev->mddev; |
1434 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
1435 | ||
faeff83f GJ |
1436 | cmsg.type = cpu_to_le32(RE_ADD); |
1437 | cmsg.raid_slot = cpu_to_le32(rdev->desc_nr); | |
0ba95977 | 1438 | err = sendmsg(cinfo, &cmsg, 1); |
97f6cd39 GR |
1439 | if (err) |
1440 | goto out; | |
1441 | ||
1442 | for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) { | |
1443 | if (sn == (cinfo->slot_number - 1)) | |
1444 | continue; | |
1445 | err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false); | |
1446 | if (err) { | |
1447 | pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn); | |
1448 | goto out; | |
1449 | } | |
1450 | if ((hi > 0) && (lo < mddev->recovery_cp)) | |
1451 | mddev->recovery_cp = lo; | |
1452 | } | |
1453 | out: | |
1454 | return err; | |
1455 | } | |
1456 | ||
edb39c9d GR |
1457 | static struct md_cluster_operations cluster_ops = { |
1458 | .join = join, | |
1459 | .leave = leave, | |
cf921cc1 | 1460 | .slot_number = slot_number, |
c186b128 GR |
1461 | .resync_start = resync_start, |
1462 | .resync_finish = resync_finish, | |
96ae923a | 1463 | .resync_info_update = resync_info_update, |
293467aa GR |
1464 | .metadata_update_start = metadata_update_start, |
1465 | .metadata_update_finish = metadata_update_finish, | |
1466 | .metadata_update_cancel = metadata_update_cancel, | |
589a1c49 | 1467 | .area_resyncing = area_resyncing, |
dbb64f86 GR |
1468 | .add_new_disk = add_new_disk, |
1469 | .add_new_disk_cancel = add_new_disk_cancel, | |
1aee41f6 | 1470 | .new_disk_ack = new_disk_ack, |
88bcfef7 | 1471 | .remove_disk = remove_disk, |
51e453ae | 1472 | .load_bitmaps = load_bitmaps, |
97f6cd39 | 1473 | .gather_bitmaps = gather_bitmaps, |
f6a2dc64 GJ |
1474 | .lock_all_bitmaps = lock_all_bitmaps, |
1475 | .unlock_all_bitmaps = unlock_all_bitmaps, | |
818da59f | 1476 | .update_size = update_size, |
edb39c9d GR |
1477 | }; |
1478 | ||
8e854e9c GR |
1479 | static int __init cluster_init(void) |
1480 | { | |
1481 | pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n"); | |
1482 | pr_info("Registering Cluster MD functions\n"); | |
edb39c9d | 1483 | register_md_cluster_operations(&cluster_ops, THIS_MODULE); |
8e854e9c GR |
1484 | return 0; |
1485 | } | |
1486 | ||
1487 | static void cluster_exit(void) | |
1488 | { | |
edb39c9d | 1489 | unregister_md_cluster_operations(); |
8e854e9c GR |
1490 | } |
1491 | ||
1492 | module_init(cluster_init); | |
1493 | module_exit(cluster_exit); | |
86b57277 | 1494 | MODULE_AUTHOR("SUSE"); |
8e854e9c GR |
1495 | MODULE_LICENSE("GPL"); |
1496 | MODULE_DESCRIPTION("Clustering support for MD"); |