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