blob: fcfc4b9b26728029e59023ae3762d271b8f7a676 [file] [log] [blame]
Goldwyn Rodrigues8e854e92014-03-07 11:21:15 -06001/*
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>
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -060013#include <linux/dlm.h>
14#include <linux/sched.h>
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -050015#include <linux/raid/md_p.h>
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -060016#include "md.h"
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -050017#include "bitmap.h"
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -050018#include "md-cluster.h"
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -060019
20#define LVB_SIZE 64
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -050021#define NEW_DEV_TIMEOUT 5000
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -060022
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() */
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -060028 struct completion completion; /* completion for synchronized locking */
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -050029 void (*bast)(void *arg, int mode); /* blocking AST function pointer*/
30 struct mddev *mddev; /* pointing back to mddev. */
31};
32
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -050033struct suspend_info {
34 int slot;
35 sector_t lo;
36 sector_t hi;
37 struct list_head list;
38};
39
40struct resync_info {
41 __le64 lo;
42 __le64 hi;
43};
44
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -060045/* md_cluster_info flags */
46#define MD_CLUSTER_WAITING_FOR_NEWDISK 1
47
48
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -050049struct md_cluster_info {
50 /* dlm lock space and resources for clustered raid. */
51 dlm_lockspace_t *lockspace;
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -050052 int slot_number;
53 struct completion completion;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -050054 struct dlm_lock_resource *sb_lock;
55 struct mutex sb_mutex;
Goldwyn Rodrigues54519c52014-06-06 12:12:32 -050056 struct dlm_lock_resource *bitmap_lockres;
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -050057 struct list_head suspend_list;
58 spinlock_t suspend_lock;
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -050059 struct md_thread *recovery_thread;
60 unsigned long recovery_map;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -050061 /* communication loc resources */
62 struct dlm_lock_resource *ack_lockres;
63 struct dlm_lock_resource *message_lockres;
64 struct dlm_lock_resource *token_lockres;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -050065 struct dlm_lock_resource *no_new_dev_lockres;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -050066 struct md_thread *recv_thread;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -050067 struct completion newdisk_completion;
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -060068 unsigned long state;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -050069};
70
71enum msg_type {
72 METADATA_UPDATED = 0,
73 RESYNCING,
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -050074 NEWDISK,
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -050075 REMOVE,
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -050076 RE_ADD,
Goldwyn Rodrigues46646802014-06-07 01:08:29 -050077};
78
79struct cluster_msg {
80 int type;
81 int slot;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -050082 /* TODO: Unionize this for smaller footprint */
Goldwyn Rodrigues46646802014-06-07 01:08:29 -050083 sector_t low;
84 sector_t high;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -050085 char uuid[16];
86 int raid_slot;
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -060087};
88
89static void sync_ast(void *arg)
90{
91 struct dlm_lock_resource *res;
92
93 res = (struct dlm_lock_resource *) arg;
94 complete(&res->completion);
95}
96
97static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
98{
99 int ret = 0;
100
101 init_completion(&res->completion);
102 ret = dlm_lock(res->ls, mode, &res->lksb,
103 res->flags, res->name, strlen(res->name),
104 0, sync_ast, res, res->bast);
105 if (ret)
106 return ret;
107 wait_for_completion(&res->completion);
108 return res->lksb.sb_status;
109}
110
111static int dlm_unlock_sync(struct dlm_lock_resource *res)
112{
113 return dlm_lock_sync(res, DLM_LOCK_NL);
114}
115
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500116static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600117 char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
118{
119 struct dlm_lock_resource *res = NULL;
120 int ret, namelen;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500121 struct md_cluster_info *cinfo = mddev->cluster_info;
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600122
123 res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
124 if (!res)
125 return NULL;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500126 res->ls = cinfo->lockspace;
127 res->mddev = mddev;
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600128 namelen = strlen(name);
129 res->name = kzalloc(namelen + 1, GFP_KERNEL);
130 if (!res->name) {
131 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
132 goto out_err;
133 }
134 strlcpy(res->name, name, namelen + 1);
135 if (with_lvb) {
136 res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL);
137 if (!res->lksb.sb_lvbptr) {
138 pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name);
139 goto out_err;
140 }
141 res->flags = DLM_LKF_VALBLK;
142 }
143
144 if (bastfn)
145 res->bast = bastfn;
146
147 res->flags |= DLM_LKF_EXPEDITE;
148
149 ret = dlm_lock_sync(res, DLM_LOCK_NL);
150 if (ret) {
151 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
152 goto out_err;
153 }
154 res->flags &= ~DLM_LKF_EXPEDITE;
155 res->flags |= DLM_LKF_CONVERT;
156
157 return res;
158out_err:
159 kfree(res->lksb.sb_lvbptr);
160 kfree(res->name);
161 kfree(res);
162 return NULL;
163}
164
165static void lockres_free(struct dlm_lock_resource *res)
166{
167 if (!res)
168 return;
169
170 init_completion(&res->completion);
171 dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res);
172 wait_for_completion(&res->completion);
173
174 kfree(res->name);
175 kfree(res->lksb.sb_lvbptr);
176 kfree(res);
177}
Goldwyn Rodrigues8e854e92014-03-07 11:21:15 -0600178
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500179static char *pretty_uuid(char *dest, char *src)
180{
181 int i, len = 0;
182
183 for (i = 0; i < 16; i++) {
184 if (i == 4 || i == 6 || i == 8 || i == 10)
185 len += sprintf(dest + len, "-");
186 len += sprintf(dest + len, "%02x", (__u8)src[i]);
187 }
188 return dest;
189}
190
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500191static void add_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres,
192 sector_t lo, sector_t hi)
193{
194 struct resync_info *ri;
195
196 ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
197 ri->lo = cpu_to_le64(lo);
198 ri->hi = cpu_to_le64(hi);
199}
200
201static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres)
202{
203 struct resync_info ri;
204 struct suspend_info *s = NULL;
205 sector_t hi = 0;
206
207 dlm_lock_sync(lockres, DLM_LOCK_CR);
208 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
209 hi = le64_to_cpu(ri.hi);
210 if (ri.hi > 0) {
211 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
212 if (!s)
213 goto out;
214 s->hi = hi;
215 s->lo = le64_to_cpu(ri.lo);
216 }
217 dlm_unlock_sync(lockres);
218out:
219 return s;
220}
221
kbuild test robot6dc69c92015-02-28 07:04:37 +0800222static void recover_bitmaps(struct md_thread *thread)
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500223{
224 struct mddev *mddev = thread->mddev;
225 struct md_cluster_info *cinfo = mddev->cluster_info;
226 struct dlm_lock_resource *bm_lockres;
227 char str[64];
228 int slot, ret;
229 struct suspend_info *s, *tmp;
230 sector_t lo, hi;
231
232 while (cinfo->recovery_map) {
233 slot = fls64((u64)cinfo->recovery_map) - 1;
234
235 /* Clear suspend_area associated with the bitmap */
236 spin_lock_irq(&cinfo->suspend_lock);
237 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
238 if (slot == s->slot) {
239 list_del(&s->list);
240 kfree(s);
241 }
242 spin_unlock_irq(&cinfo->suspend_lock);
243
244 snprintf(str, 64, "bitmap%04d", slot);
245 bm_lockres = lockres_init(mddev, str, NULL, 1);
246 if (!bm_lockres) {
247 pr_err("md-cluster: Cannot initialize bitmaps\n");
248 goto clear_bit;
249 }
250
251 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
252 if (ret) {
253 pr_err("md-cluster: Could not DLM lock %s: %d\n",
254 str, ret);
255 goto clear_bit;
256 }
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500257 ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
Goldwyn Rodrigues4b26a082014-06-07 00:52:29 -0500258 if (ret) {
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500259 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
Goldwyn Rodrigues4b26a082014-06-07 00:52:29 -0500260 goto dlm_unlock;
261 }
262 if (hi > 0) {
263 /* TODO:Wait for current resync to get over */
264 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
265 if (lo < mddev->recovery_cp)
266 mddev->recovery_cp = lo;
267 md_check_recovery(mddev);
268 }
269dlm_unlock:
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500270 dlm_unlock_sync(bm_lockres);
271clear_bit:
272 clear_bit(slot, &cinfo->recovery_map);
273 }
274}
275
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500276static void recover_prep(void *arg)
277{
278}
279
280static void recover_slot(void *arg, struct dlm_slot *slot)
281{
282 struct mddev *mddev = arg;
283 struct md_cluster_info *cinfo = mddev->cluster_info;
284
285 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
286 mddev->bitmap_info.cluster_name,
287 slot->nodeid, slot->slot,
288 cinfo->slot_number);
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500289 set_bit(slot->slot - 1, &cinfo->recovery_map);
290 if (!cinfo->recovery_thread) {
291 cinfo->recovery_thread = md_register_thread(recover_bitmaps,
292 mddev, "recover");
293 if (!cinfo->recovery_thread) {
294 pr_warn("md-cluster: Could not create recovery thread\n");
295 return;
296 }
297 }
298 md_wakeup_thread(cinfo->recovery_thread);
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500299}
300
301static void recover_done(void *arg, struct dlm_slot *slots,
302 int num_slots, int our_slot,
303 uint32_t generation)
304{
305 struct mddev *mddev = arg;
306 struct md_cluster_info *cinfo = mddev->cluster_info;
307
308 cinfo->slot_number = our_slot;
309 complete(&cinfo->completion);
310}
311
312static const struct dlm_lockspace_ops md_ls_ops = {
313 .recover_prep = recover_prep,
314 .recover_slot = recover_slot,
315 .recover_done = recover_done,
316};
317
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500318/*
319 * The BAST function for the ack lock resource
320 * This function wakes up the receive thread in
321 * order to receive and process the message.
322 */
323static void ack_bast(void *arg, int mode)
324{
325 struct dlm_lock_resource *res = (struct dlm_lock_resource *)arg;
326 struct md_cluster_info *cinfo = res->mddev->cluster_info;
327
328 if (mode == DLM_LOCK_EX)
329 md_wakeup_thread(cinfo->recv_thread);
330}
331
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500332static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot)
333{
334 struct suspend_info *s, *tmp;
335
336 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
337 if (slot == s->slot) {
338 pr_info("%s:%d Deleting suspend_info: %d\n",
339 __func__, __LINE__, slot);
340 list_del(&s->list);
341 kfree(s);
342 break;
343 }
344}
345
346static void remove_suspend_info(struct md_cluster_info *cinfo, int slot)
347{
348 spin_lock_irq(&cinfo->suspend_lock);
349 __remove_suspend_info(cinfo, slot);
350 spin_unlock_irq(&cinfo->suspend_lock);
351}
352
353
354static void process_suspend_info(struct md_cluster_info *cinfo,
355 int slot, sector_t lo, sector_t hi)
356{
357 struct suspend_info *s;
358
359 if (!hi) {
360 remove_suspend_info(cinfo, slot);
361 return;
362 }
363 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
364 if (!s)
365 return;
366 s->slot = slot;
367 s->lo = lo;
368 s->hi = hi;
369 spin_lock_irq(&cinfo->suspend_lock);
370 /* Remove existing entry (if exists) before adding */
371 __remove_suspend_info(cinfo, slot);
372 list_add(&s->list, &cinfo->suspend_list);
373 spin_unlock_irq(&cinfo->suspend_lock);
374}
375
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500376static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
377{
378 char disk_uuid[64];
379 struct md_cluster_info *cinfo = mddev->cluster_info;
380 char event_name[] = "EVENT=ADD_DEVICE";
381 char raid_slot[16];
382 char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
383 int len;
384
385 len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
386 pretty_uuid(disk_uuid + len, cmsg->uuid);
387 snprintf(raid_slot, 16, "RAID_DISK=%d", cmsg->raid_slot);
388 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
389 init_completion(&cinfo->newdisk_completion);
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -0600390 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500391 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
392 wait_for_completion_timeout(&cinfo->newdisk_completion,
393 NEW_DEV_TIMEOUT);
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -0600394 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500395}
396
397
398static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
399{
400 struct md_cluster_info *cinfo = mddev->cluster_info;
401
402 md_reload_sb(mddev);
403 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
404}
405
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500406static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
407{
408 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot);
409
410 if (rdev)
411 md_kick_rdev_from_array(rdev);
412 else
413 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", __func__, __LINE__, msg->raid_slot);
414}
415
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500416static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
417{
418 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot);
419
420 if (rdev && test_bit(Faulty, &rdev->flags))
421 clear_bit(Faulty, &rdev->flags);
422 else
423 pr_warn("%s: %d Could not find disk(%d) which is faulty", __func__, __LINE__, msg->raid_slot);
424}
425
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500426static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
427{
428 switch (msg->type) {
429 case METADATA_UPDATED:
430 pr_info("%s: %d Received message: METADATA_UPDATE from %d\n",
431 __func__, __LINE__, msg->slot);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500432 process_metadata_update(mddev, msg);
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500433 break;
434 case RESYNCING:
435 pr_info("%s: %d Received message: RESYNCING from %d\n",
436 __func__, __LINE__, msg->slot);
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500437 process_suspend_info(mddev->cluster_info, msg->slot,
438 msg->low, msg->high);
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500439 break;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500440 case NEWDISK:
441 pr_info("%s: %d Received message: NEWDISK from %d\n",
442 __func__, __LINE__, msg->slot);
443 process_add_new_disk(mddev, msg);
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500444 break;
445 case REMOVE:
446 pr_info("%s: %d Received REMOVE from %d\n",
447 __func__, __LINE__, msg->slot);
448 process_remove_disk(mddev, msg);
449 break;
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500450 case RE_ADD:
451 pr_info("%s: %d Received RE_ADD from %d\n",
452 __func__, __LINE__, msg->slot);
453 process_readd_disk(mddev, msg);
454 break;
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500455 default:
456 pr_warn("%s:%d Received unknown message from %d\n",
457 __func__, __LINE__, msg->slot);
kbuild test robot09dd1af2015-02-28 09:16:08 +0800458 }
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500459}
460
461/*
462 * thread for receiving message
463 */
464static void recv_daemon(struct md_thread *thread)
465{
466 struct md_cluster_info *cinfo = thread->mddev->cluster_info;
467 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
468 struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
469 struct cluster_msg msg;
470
471 /*get CR on Message*/
472 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
473 pr_err("md/raid1:failed to get CR on MESSAGE\n");
474 return;
475 }
476
477 /* read lvb and wake up thread to process this message_lockres */
478 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
479 process_recvd_msg(thread->mddev, &msg);
480
481 /*release CR on ack_lockres*/
482 dlm_unlock_sync(ack_lockres);
483 /*up-convert to EX on message_lockres*/
484 dlm_lock_sync(message_lockres, DLM_LOCK_EX);
485 /*get CR on ack_lockres again*/
486 dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
487 /*release CR on message_lockres*/
488 dlm_unlock_sync(message_lockres);
489}
490
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500491/* lock_comm()
492 * Takes the lock on the TOKEN lock resource so no other
493 * node can communicate while the operation is underway.
494 */
495static int lock_comm(struct md_cluster_info *cinfo)
496{
497 int error;
498
499 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
500 if (error)
501 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
502 __func__, __LINE__, error);
503 return error;
504}
505
506static void unlock_comm(struct md_cluster_info *cinfo)
507{
508 dlm_unlock_sync(cinfo->token_lockres);
509}
510
511/* __sendmsg()
512 * This function performs the actual sending of the message. This function is
513 * usually called after performing the encompassing operation
514 * The function:
515 * 1. Grabs the message lockresource in EX mode
516 * 2. Copies the message to the message LVB
517 * 3. Downconverts message lockresource to CR
518 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
519 * and the other nodes read the message. The thread will wait here until all other
520 * nodes have released ack lock resource.
521 * 5. Downconvert ack lockresource to CR
522 */
523static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
524{
525 int error;
526 int slot = cinfo->slot_number - 1;
527
528 cmsg->slot = cpu_to_le32(slot);
529 /*get EX on Message*/
530 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
531 if (error) {
532 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
533 goto failed_message;
534 }
535
536 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
537 sizeof(struct cluster_msg));
538 /*down-convert EX to CR on Message*/
539 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CR);
540 if (error) {
541 pr_err("md-cluster: failed to convert EX to CR on MESSAGE(%d)\n",
542 error);
543 goto failed_message;
544 }
545
546 /*up-convert CR to EX on Ack*/
547 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
548 if (error) {
549 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
550 error);
551 goto failed_ack;
552 }
553
554 /*down-convert EX to CR on Ack*/
555 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
556 if (error) {
557 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
558 error);
559 goto failed_ack;
560 }
561
562failed_ack:
563 dlm_unlock_sync(cinfo->message_lockres);
564failed_message:
565 return error;
566}
567
568static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
569{
570 int ret;
571
572 lock_comm(cinfo);
573 ret = __sendmsg(cinfo, cmsg);
574 unlock_comm(cinfo);
575 return ret;
576}
577
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500578static int gather_all_resync_info(struct mddev *mddev, int total_slots)
579{
580 struct md_cluster_info *cinfo = mddev->cluster_info;
581 int i, ret = 0;
582 struct dlm_lock_resource *bm_lockres;
583 struct suspend_info *s;
584 char str[64];
585
586
587 for (i = 0; i < total_slots; i++) {
588 memset(str, '\0', 64);
589 snprintf(str, 64, "bitmap%04d", i);
590 bm_lockres = lockres_init(mddev, str, NULL, 1);
591 if (!bm_lockres)
592 return -ENOMEM;
593 if (i == (cinfo->slot_number - 1))
594 continue;
595
596 bm_lockres->flags |= DLM_LKF_NOQUEUE;
597 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
598 if (ret == -EAGAIN) {
599 memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE);
600 s = read_resync_info(mddev, bm_lockres);
601 if (s) {
602 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
603 __func__, __LINE__,
604 (unsigned long long) s->lo,
605 (unsigned long long) s->hi, i);
606 spin_lock_irq(&cinfo->suspend_lock);
607 s->slot = i;
608 list_add(&s->list, &cinfo->suspend_list);
609 spin_unlock_irq(&cinfo->suspend_lock);
610 }
611 ret = 0;
612 lockres_free(bm_lockres);
613 continue;
614 }
615 if (ret)
616 goto out;
617 /* TODO: Read the disk bitmap sb and check if it needs recovery */
618 dlm_unlock_sync(bm_lockres);
619 lockres_free(bm_lockres);
620 }
621out:
622 return ret;
623}
624
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500625static int join(struct mddev *mddev, int nodes)
626{
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500627 struct md_cluster_info *cinfo;
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500628 int ret, ops_rv;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500629 char str[64];
630
631 if (!try_module_get(THIS_MODULE))
632 return -ENOENT;
633
634 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
635 if (!cinfo)
636 return -ENOMEM;
637
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500638 init_completion(&cinfo->completion);
639
640 mutex_init(&cinfo->sb_mutex);
641 mddev->cluster_info = cinfo;
642
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500643 memset(str, 0, 64);
644 pretty_uuid(str, mddev->uuid);
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500645 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
646 DLM_LSFL_FS, LVB_SIZE,
647 &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace);
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500648 if (ret)
649 goto err;
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500650 wait_for_completion(&cinfo->completion);
Guoqing Jiang8c58f022015-04-21 11:25:52 -0500651 if (nodes < cinfo->slot_number) {
652 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
653 cinfo->slot_number, nodes);
Goldwyn Rodriguesb97e92572014-06-06 11:50:56 -0500654 ret = -ERANGE;
655 goto err;
656 }
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500657 cinfo->sb_lock = lockres_init(mddev, "cmd-super",
658 NULL, 0);
659 if (!cinfo->sb_lock) {
660 ret = -ENOMEM;
661 goto err;
662 }
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500663 /* Initiate the communication resources */
664 ret = -ENOMEM;
665 cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
666 if (!cinfo->recv_thread) {
667 pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
668 goto err;
669 }
670 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
671 if (!cinfo->message_lockres)
672 goto err;
673 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
674 if (!cinfo->token_lockres)
675 goto err;
676 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
677 if (!cinfo->ack_lockres)
678 goto err;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500679 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
680 if (!cinfo->no_new_dev_lockres)
681 goto err;
682
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500683 /* get sync CR lock on ACK. */
684 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
685 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
686 ret);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500687 /* get sync CR lock on no-new-dev. */
688 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
689 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
690
Goldwyn Rodrigues54519c52014-06-06 12:12:32 -0500691
692 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
693 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
694 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
695 if (!cinfo->bitmap_lockres)
696 goto err;
697 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
698 pr_err("Failed to get bitmap lock\n");
699 ret = -EINVAL;
700 goto err;
701 }
702
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500703 INIT_LIST_HEAD(&cinfo->suspend_list);
704 spin_lock_init(&cinfo->suspend_lock);
705
706 ret = gather_all_resync_info(mddev, nodes);
707 if (ret)
708 goto err;
709
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500710 return 0;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500711err:
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500712 lockres_free(cinfo->message_lockres);
713 lockres_free(cinfo->token_lockres);
714 lockres_free(cinfo->ack_lockres);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500715 lockres_free(cinfo->no_new_dev_lockres);
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500716 lockres_free(cinfo->bitmap_lockres);
717 lockres_free(cinfo->sb_lock);
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500718 if (cinfo->lockspace)
719 dlm_release_lockspace(cinfo->lockspace, 2);
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500720 mddev->cluster_info = NULL;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500721 kfree(cinfo);
722 module_put(THIS_MODULE);
723 return ret;
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500724}
725
726static int leave(struct mddev *mddev)
727{
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500728 struct md_cluster_info *cinfo = mddev->cluster_info;
729
730 if (!cinfo)
731 return 0;
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500732 md_unregister_thread(&cinfo->recovery_thread);
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500733 md_unregister_thread(&cinfo->recv_thread);
734 lockres_free(cinfo->message_lockres);
735 lockres_free(cinfo->token_lockres);
736 lockres_free(cinfo->ack_lockres);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500737 lockres_free(cinfo->no_new_dev_lockres);
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500738 lockres_free(cinfo->sb_lock);
Goldwyn Rodrigues54519c52014-06-06 12:12:32 -0500739 lockres_free(cinfo->bitmap_lockres);
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500740 dlm_release_lockspace(cinfo->lockspace, 2);
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500741 return 0;
742}
743
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500744/* slot_number(): Returns the MD slot number to use
745 * DLM starts the slot numbers from 1, wheras cluster-md
746 * wants the number to be from zero, so we deduct one
747 */
748static int slot_number(struct mddev *mddev)
749{
750 struct md_cluster_info *cinfo = mddev->cluster_info;
751
752 return cinfo->slot_number - 1;
753}
754
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500755static void resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
756{
757 struct md_cluster_info *cinfo = mddev->cluster_info;
758
759 add_resync_info(mddev, cinfo->bitmap_lockres, lo, hi);
760 /* Re-acquire the lock to refresh LVB */
761 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
762}
763
Goldwyn Rodrigues293467a2014-06-07 01:44:51 -0500764static int metadata_update_start(struct mddev *mddev)
765{
766 return lock_comm(mddev->cluster_info);
767}
768
769static int metadata_update_finish(struct mddev *mddev)
770{
771 struct md_cluster_info *cinfo = mddev->cluster_info;
772 struct cluster_msg cmsg;
773 int ret;
774
775 memset(&cmsg, 0, sizeof(cmsg));
776 cmsg.type = cpu_to_le32(METADATA_UPDATED);
777 ret = __sendmsg(cinfo, &cmsg);
778 unlock_comm(cinfo);
779 return ret;
780}
781
782static int metadata_update_cancel(struct mddev *mddev)
783{
784 struct md_cluster_info *cinfo = mddev->cluster_info;
785
786 return dlm_unlock_sync(cinfo->token_lockres);
787}
788
Goldwyn Rodrigues965400e2014-06-07 02:16:58 -0500789static int resync_send(struct mddev *mddev, enum msg_type type,
790 sector_t lo, sector_t hi)
791{
792 struct md_cluster_info *cinfo = mddev->cluster_info;
793 struct cluster_msg cmsg;
794 int slot = cinfo->slot_number - 1;
795
796 pr_info("%s:%d lo: %llu hi: %llu\n", __func__, __LINE__,
797 (unsigned long long)lo,
798 (unsigned long long)hi);
799 resync_info_update(mddev, lo, hi);
800 cmsg.type = cpu_to_le32(type);
801 cmsg.slot = cpu_to_le32(slot);
802 cmsg.low = cpu_to_le64(lo);
803 cmsg.high = cpu_to_le64(hi);
804 return sendmsg(cinfo, &cmsg);
805}
806
807static int resync_start(struct mddev *mddev, sector_t lo, sector_t hi)
808{
809 pr_info("%s:%d\n", __func__, __LINE__);
810 return resync_send(mddev, RESYNCING, lo, hi);
811}
812
813static void resync_finish(struct mddev *mddev)
814{
815 pr_info("%s:%d\n", __func__, __LINE__);
816 resync_send(mddev, RESYNCING, 0, 0);
817}
818
Goldwyn Rodrigues589a1c42014-06-07 02:39:37 -0500819static int area_resyncing(struct mddev *mddev, sector_t lo, sector_t hi)
820{
821 struct md_cluster_info *cinfo = mddev->cluster_info;
822 int ret = 0;
823 struct suspend_info *s;
824
825 spin_lock_irq(&cinfo->suspend_lock);
826 if (list_empty(&cinfo->suspend_list))
827 goto out;
828 list_for_each_entry(s, &cinfo->suspend_list, list)
829 if (hi > s->lo && lo < s->hi) {
830 ret = 1;
831 break;
832 }
833out:
834 spin_unlock_irq(&cinfo->suspend_lock);
835 return ret;
836}
837
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500838static int add_new_disk_start(struct mddev *mddev, struct md_rdev *rdev)
839{
840 struct md_cluster_info *cinfo = mddev->cluster_info;
841 struct cluster_msg cmsg;
842 int ret = 0;
843 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
844 char *uuid = sb->device_uuid;
845
846 memset(&cmsg, 0, sizeof(cmsg));
847 cmsg.type = cpu_to_le32(NEWDISK);
848 memcpy(cmsg.uuid, uuid, 16);
849 cmsg.raid_slot = rdev->desc_nr;
850 lock_comm(cinfo);
851 ret = __sendmsg(cinfo, &cmsg);
852 if (ret)
853 return ret;
854 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
855 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
856 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
857 /* Some node does not "see" the device */
858 if (ret == -EAGAIN)
859 ret = -ENOENT;
860 else
861 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
862 return ret;
863}
864
865static int add_new_disk_finish(struct mddev *mddev)
866{
867 struct cluster_msg cmsg;
868 struct md_cluster_info *cinfo = mddev->cluster_info;
869 int ret;
870 /* Write sb and inform others */
871 md_update_sb(mddev, 1);
872 cmsg.type = METADATA_UPDATED;
873 ret = __sendmsg(cinfo, &cmsg);
874 unlock_comm(cinfo);
875 return ret;
876}
877
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -0600878static int new_disk_ack(struct mddev *mddev, bool ack)
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500879{
880 struct md_cluster_info *cinfo = mddev->cluster_info;
881
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -0600882 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
883 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
884 return -EINVAL;
885 }
886
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500887 if (ack)
888 dlm_unlock_sync(cinfo->no_new_dev_lockres);
889 complete(&cinfo->newdisk_completion);
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -0600890 return 0;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500891}
892
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500893static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
894{
895 struct cluster_msg cmsg;
896 struct md_cluster_info *cinfo = mddev->cluster_info;
897 cmsg.type = REMOVE;
898 cmsg.raid_slot = rdev->desc_nr;
899 return __sendmsg(cinfo, &cmsg);
900}
901
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500902static int gather_bitmaps(struct md_rdev *rdev)
903{
904 int sn, err;
905 sector_t lo, hi;
906 struct cluster_msg cmsg;
907 struct mddev *mddev = rdev->mddev;
908 struct md_cluster_info *cinfo = mddev->cluster_info;
909
910 cmsg.type = RE_ADD;
911 cmsg.raid_slot = rdev->desc_nr;
912 err = sendmsg(cinfo, &cmsg);
913 if (err)
914 goto out;
915
916 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
917 if (sn == (cinfo->slot_number - 1))
918 continue;
919 err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
920 if (err) {
921 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
922 goto out;
923 }
924 if ((hi > 0) && (lo < mddev->recovery_cp))
925 mddev->recovery_cp = lo;
926 }
927out:
928 return err;
929}
930
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500931static struct md_cluster_operations cluster_ops = {
932 .join = join,
933 .leave = leave,
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500934 .slot_number = slot_number,
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500935 .resync_info_update = resync_info_update,
Goldwyn Rodrigues965400e2014-06-07 02:16:58 -0500936 .resync_start = resync_start,
937 .resync_finish = resync_finish,
Goldwyn Rodrigues293467a2014-06-07 01:44:51 -0500938 .metadata_update_start = metadata_update_start,
939 .metadata_update_finish = metadata_update_finish,
940 .metadata_update_cancel = metadata_update_cancel,
Goldwyn Rodrigues589a1c42014-06-07 02:39:37 -0500941 .area_resyncing = area_resyncing,
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500942 .add_new_disk_start = add_new_disk_start,
943 .add_new_disk_finish = add_new_disk_finish,
944 .new_disk_ack = new_disk_ack,
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500945 .remove_disk = remove_disk,
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500946 .gather_bitmaps = gather_bitmaps,
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500947};
948
Goldwyn Rodrigues8e854e92014-03-07 11:21:15 -0600949static int __init cluster_init(void)
950{
951 pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");
952 pr_info("Registering Cluster MD functions\n");
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500953 register_md_cluster_operations(&cluster_ops, THIS_MODULE);
Goldwyn Rodrigues8e854e92014-03-07 11:21:15 -0600954 return 0;
955}
956
957static void cluster_exit(void)
958{
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500959 unregister_md_cluster_operations();
Goldwyn Rodrigues8e854e92014-03-07 11:21:15 -0600960}
961
962module_init(cluster_init);
963module_exit(cluster_exit);
964MODULE_LICENSE("GPL");
965MODULE_DESCRIPTION("Clustering support for MD");