blob: 41573f1f626f4dd43dd97d5e6372e38e6987ae5d [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. */
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -050031 int mode;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -050032};
33
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -050034struct 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
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -060046/* md_cluster_info flags */
47#define MD_CLUSTER_WAITING_FOR_NEWDISK 1
Goldwyn Rodrigues90382ed2015-06-24 09:30:32 -050048#define MD_CLUSTER_SUSPEND_READ_BALANCING 2
Guoqing Jiangeece0752015-07-10 17:01:21 +080049#define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -060050
Guoqing Jiang8b9277c2015-12-21 10:51:00 +110051/* Lock the send communication. This is done through
52 * bit manipulation as opposed to a mutex in order to
53 * accomodate lock and hold. See next comment.
54 */
55#define MD_CLUSTER_SEND_LOCK 4
Guoqing Jiange19508f2015-12-21 10:51:01 +110056/* If cluster operations (such as adding a disk) must lock the
57 * communication channel, so as to perform extra operations
58 * (update metadata) and no other operation is allowed on the
59 * MD. Token needs to be locked and held until the operation
60 * completes witha md_update_sb(), which would eventually release
61 * the lock.
Guoqing Jiang8b9277c2015-12-21 10:51:00 +110062 */
63#define MD_CLUSTER_SEND_LOCKED_ALREADY 5
Guoqing Jiang51e453a2016-05-04 02:17:09 -040064/* We should receive message after node joined cluster and
65 * set up all the related infos such as bitmap and personality */
66#define MD_CLUSTER_ALREADY_IN_CLUSTER 6
67#define MD_CLUSTER_PENDING_RECV_EVENT 7
Guoqing Jiang8b9277c2015-12-21 10:51:00 +110068
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -060069
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -050070struct md_cluster_info {
71 /* dlm lock space and resources for clustered raid. */
72 dlm_lockspace_t *lockspace;
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -050073 int slot_number;
74 struct completion completion;
Guoqing Jiang8b9277c2015-12-21 10:51:00 +110075 struct mutex recv_mutex;
Goldwyn Rodrigues54519c52014-06-06 12:12:32 -050076 struct dlm_lock_resource *bitmap_lockres;
Guoqing Jiangf6a2dc62015-12-21 10:51:00 +110077 struct dlm_lock_resource **other_bitmap_lockres;
Goldwyn Rodriguesc186b122015-09-30 13:20:35 -050078 struct dlm_lock_resource *resync_lockres;
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -050079 struct list_head suspend_list;
80 spinlock_t suspend_lock;
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -050081 struct md_thread *recovery_thread;
82 unsigned long recovery_map;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -050083 /* communication loc resources */
84 struct dlm_lock_resource *ack_lockres;
85 struct dlm_lock_resource *message_lockres;
86 struct dlm_lock_resource *token_lockres;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -050087 struct dlm_lock_resource *no_new_dev_lockres;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -050088 struct md_thread *recv_thread;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -050089 struct completion newdisk_completion;
Guoqing Jiang8b9277c2015-12-21 10:51:00 +110090 wait_queue_head_t wait;
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -060091 unsigned long state;
Guoqing Jiang18c9ff72016-05-02 11:50:12 -040092 /* record the region in RESYNCING message */
93 sector_t sync_low;
94 sector_t sync_hi;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -050095};
96
97enum msg_type {
98 METADATA_UPDATED = 0,
99 RESYNCING,
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500100 NEWDISK,
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500101 REMOVE,
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500102 RE_ADD,
Guoqing Jiangdc737d72015-07-10 16:54:04 +0800103 BITMAP_NEEDS_SYNC,
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500104};
105
106struct cluster_msg {
Guoqing Jiangcf97a342015-10-16 15:40:22 +0800107 __le32 type;
108 __le32 slot;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500109 /* TODO: Unionize this for smaller footprint */
Guoqing Jiangcf97a342015-10-16 15:40:22 +0800110 __le64 low;
111 __le64 high;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500112 char uuid[16];
Guoqing Jiangcf97a342015-10-16 15:40:22 +0800113 __le32 raid_slot;
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600114};
115
116static void sync_ast(void *arg)
117{
118 struct dlm_lock_resource *res;
119
NeilBrown2e2a7cd2015-10-19 15:42:18 +1100120 res = arg;
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600121 complete(&res->completion);
122}
123
124static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
125{
126 int ret = 0;
127
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600128 ret = dlm_lock(res->ls, mode, &res->lksb,
129 res->flags, res->name, strlen(res->name),
130 0, sync_ast, res, res->bast);
131 if (ret)
132 return ret;
133 wait_for_completion(&res->completion);
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -0500134 if (res->lksb.sb_status == 0)
135 res->mode = mode;
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600136 return res->lksb.sb_status;
137}
138
139static int dlm_unlock_sync(struct dlm_lock_resource *res)
140{
141 return dlm_lock_sync(res, DLM_LOCK_NL);
142}
143
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500144static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600145 char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
146{
147 struct dlm_lock_resource *res = NULL;
148 int ret, namelen;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500149 struct md_cluster_info *cinfo = mddev->cluster_info;
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600150
151 res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
152 if (!res)
153 return NULL;
Guoqing Jiangb83d51c2015-07-10 17:01:16 +0800154 init_completion(&res->completion);
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500155 res->ls = cinfo->lockspace;
156 res->mddev = mddev;
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -0500157 res->mode = DLM_LOCK_IV;
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600158 namelen = strlen(name);
159 res->name = kzalloc(namelen + 1, GFP_KERNEL);
160 if (!res->name) {
161 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
162 goto out_err;
163 }
164 strlcpy(res->name, name, namelen + 1);
165 if (with_lvb) {
166 res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL);
167 if (!res->lksb.sb_lvbptr) {
168 pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name);
169 goto out_err;
170 }
171 res->flags = DLM_LKF_VALBLK;
172 }
173
174 if (bastfn)
175 res->bast = bastfn;
176
177 res->flags |= DLM_LKF_EXPEDITE;
178
179 ret = dlm_lock_sync(res, DLM_LOCK_NL);
180 if (ret) {
181 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
182 goto out_err;
183 }
184 res->flags &= ~DLM_LKF_EXPEDITE;
185 res->flags |= DLM_LKF_CONVERT;
186
187 return res;
188out_err:
189 kfree(res->lksb.sb_lvbptr);
190 kfree(res->name);
191 kfree(res);
192 return NULL;
193}
194
195static void lockres_free(struct dlm_lock_resource *res)
196{
Guoqing Jiangb5ef5672015-07-10 17:01:17 +0800197 int ret;
198
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600199 if (!res)
200 return;
201
Guoqing Jiangb5ef5672015-07-10 17:01:17 +0800202 /* cancel a lock request or a conversion request that is blocked */
203 res->flags |= DLM_LKF_CANCEL;
204retry:
205 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res);
206 if (unlikely(ret != 0)) {
207 pr_info("%s: failed to unlock %s return %d\n", __func__, res->name, ret);
208
209 /* if a lock conversion is cancelled, then the lock is put
210 * back to grant queue, need to ensure it is unlocked */
211 if (ret == -DLM_ECANCEL)
212 goto retry;
213 }
214 res->flags &= ~DLM_LKF_CANCEL;
Goldwyn Rodrigues47741b72014-03-07 13:49:26 -0600215 wait_for_completion(&res->completion);
216
217 kfree(res->name);
218 kfree(res->lksb.sb_lvbptr);
219 kfree(res);
220}
Goldwyn Rodrigues8e854e92014-03-07 11:21:15 -0600221
NeilBrown30661b42015-10-19 15:44:00 +1100222static void add_resync_info(struct dlm_lock_resource *lockres,
223 sector_t lo, sector_t hi)
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500224{
225 struct resync_info *ri;
226
227 ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
228 ri->lo = cpu_to_le64(lo);
229 ri->hi = cpu_to_le64(hi);
230}
231
232static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres)
233{
234 struct resync_info ri;
235 struct suspend_info *s = NULL;
236 sector_t hi = 0;
237
238 dlm_lock_sync(lockres, DLM_LOCK_CR);
239 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
240 hi = le64_to_cpu(ri.hi);
Guoqing Jiangcf97a342015-10-16 15:40:22 +0800241 if (hi > 0) {
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500242 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
243 if (!s)
244 goto out;
245 s->hi = hi;
246 s->lo = le64_to_cpu(ri.lo);
247 }
248 dlm_unlock_sync(lockres);
249out:
250 return s;
251}
252
kbuild test robot6dc69c92015-02-28 07:04:37 +0800253static void recover_bitmaps(struct md_thread *thread)
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500254{
255 struct mddev *mddev = thread->mddev;
256 struct md_cluster_info *cinfo = mddev->cluster_info;
257 struct dlm_lock_resource *bm_lockres;
258 char str[64];
259 int slot, ret;
260 struct suspend_info *s, *tmp;
261 sector_t lo, hi;
262
263 while (cinfo->recovery_map) {
264 slot = fls64((u64)cinfo->recovery_map) - 1;
265
266 /* Clear suspend_area associated with the bitmap */
267 spin_lock_irq(&cinfo->suspend_lock);
268 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
269 if (slot == s->slot) {
270 list_del(&s->list);
271 kfree(s);
272 }
273 spin_unlock_irq(&cinfo->suspend_lock);
274
275 snprintf(str, 64, "bitmap%04d", slot);
276 bm_lockres = lockres_init(mddev, str, NULL, 1);
277 if (!bm_lockres) {
278 pr_err("md-cluster: Cannot initialize bitmaps\n");
279 goto clear_bit;
280 }
281
282 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
283 if (ret) {
284 pr_err("md-cluster: Could not DLM lock %s: %d\n",
285 str, ret);
286 goto clear_bit;
287 }
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500288 ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
Goldwyn Rodrigues4b26a082014-06-07 00:52:29 -0500289 if (ret) {
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500290 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
Goldwyn Rodrigues4b26a082014-06-07 00:52:29 -0500291 goto dlm_unlock;
292 }
293 if (hi > 0) {
Goldwyn Rodrigues4b26a082014-06-07 00:52:29 -0500294 if (lo < mddev->recovery_cp)
295 mddev->recovery_cp = lo;
Guoqing Jiangeb315cd2016-05-02 11:33:10 -0400296 /* wake up thread to continue resync in case resync
297 * is not finished */
298 if (mddev->recovery_cp != MaxSector) {
299 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
300 md_wakeup_thread(mddev->thread);
301 }
Goldwyn Rodrigues4b26a082014-06-07 00:52:29 -0500302 }
303dlm_unlock:
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500304 dlm_unlock_sync(bm_lockres);
305clear_bit:
Shaohua Li4ac7a652016-01-22 15:54:42 -0800306 lockres_free(bm_lockres);
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500307 clear_bit(slot, &cinfo->recovery_map);
308 }
309}
310
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500311static void recover_prep(void *arg)
312{
Goldwyn Rodrigues90382ed2015-06-24 09:30:32 -0500313 struct mddev *mddev = arg;
314 struct md_cluster_info *cinfo = mddev->cluster_info;
315 set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500316}
317
Guoqing Jiang05cd0e52015-07-10 16:54:03 +0800318static void __recover_slot(struct mddev *mddev, int slot)
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500319{
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500320 struct md_cluster_info *cinfo = mddev->cluster_info;
321
Guoqing Jiang05cd0e52015-07-10 16:54:03 +0800322 set_bit(slot, &cinfo->recovery_map);
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500323 if (!cinfo->recovery_thread) {
324 cinfo->recovery_thread = md_register_thread(recover_bitmaps,
325 mddev, "recover");
326 if (!cinfo->recovery_thread) {
327 pr_warn("md-cluster: Could not create recovery thread\n");
328 return;
329 }
330 }
331 md_wakeup_thread(cinfo->recovery_thread);
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500332}
333
Guoqing Jiang05cd0e52015-07-10 16:54:03 +0800334static void recover_slot(void *arg, struct dlm_slot *slot)
335{
336 struct mddev *mddev = arg;
337 struct md_cluster_info *cinfo = mddev->cluster_info;
338
339 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
340 mddev->bitmap_info.cluster_name,
341 slot->nodeid, slot->slot,
342 cinfo->slot_number);
343 /* deduct one since dlm slot starts from one while the num of
344 * cluster-md begins with 0 */
345 __recover_slot(mddev, slot->slot - 1);
346}
347
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500348static void recover_done(void *arg, struct dlm_slot *slots,
349 int num_slots, int our_slot,
350 uint32_t generation)
351{
352 struct mddev *mddev = arg;
353 struct md_cluster_info *cinfo = mddev->cluster_info;
354
355 cinfo->slot_number = our_slot;
Guoqing Jiangeece0752015-07-10 17:01:21 +0800356 /* completion is only need to be complete when node join cluster,
357 * it doesn't need to run during another node's failure */
358 if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) {
359 complete(&cinfo->completion);
360 clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
361 }
Goldwyn Rodrigues90382ed2015-06-24 09:30:32 -0500362 clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500363}
364
Guoqing Jiangeece0752015-07-10 17:01:21 +0800365/* the ops is called when node join the cluster, and do lock recovery
366 * if node failure occurs */
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500367static const struct dlm_lockspace_ops md_ls_ops = {
368 .recover_prep = recover_prep,
369 .recover_slot = recover_slot,
370 .recover_done = recover_done,
371};
372
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500373/*
374 * The BAST function for the ack lock resource
375 * This function wakes up the receive thread in
376 * order to receive and process the message.
377 */
378static void ack_bast(void *arg, int mode)
379{
NeilBrown2e2a7cd2015-10-19 15:42:18 +1100380 struct dlm_lock_resource *res = arg;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500381 struct md_cluster_info *cinfo = res->mddev->cluster_info;
382
Guoqing Jiang51e453a2016-05-04 02:17:09 -0400383 if (mode == DLM_LOCK_EX) {
384 if (test_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state))
385 md_wakeup_thread(cinfo->recv_thread);
386 else
387 set_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state);
388 }
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500389}
390
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500391static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot)
392{
393 struct suspend_info *s, *tmp;
394
395 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
396 if (slot == s->slot) {
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500397 list_del(&s->list);
398 kfree(s);
399 break;
400 }
401}
402
Goldwyn Rodriguesb8ca8462015-10-09 11:27:01 -0500403static void remove_suspend_info(struct mddev *mddev, int slot)
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500404{
Goldwyn Rodriguesb8ca8462015-10-09 11:27:01 -0500405 struct md_cluster_info *cinfo = mddev->cluster_info;
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500406 spin_lock_irq(&cinfo->suspend_lock);
407 __remove_suspend_info(cinfo, slot);
408 spin_unlock_irq(&cinfo->suspend_lock);
Goldwyn Rodriguesb8ca8462015-10-09 11:27:01 -0500409 mddev->pers->quiesce(mddev, 2);
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500410}
411
412
Goldwyn Rodrigues9ed38ff52015-08-14 12:19:40 -0500413static void process_suspend_info(struct mddev *mddev,
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500414 int slot, sector_t lo, sector_t hi)
415{
Goldwyn Rodrigues9ed38ff52015-08-14 12:19:40 -0500416 struct md_cluster_info *cinfo = mddev->cluster_info;
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500417 struct suspend_info *s;
418
419 if (!hi) {
Goldwyn Rodriguesb8ca8462015-10-09 11:27:01 -0500420 remove_suspend_info(mddev, slot);
Goldwyn Rodriguesc186b122015-09-30 13:20:35 -0500421 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
422 md_wakeup_thread(mddev->thread);
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500423 return;
424 }
Guoqing Jiang18c9ff72016-05-02 11:50:12 -0400425
426 /*
427 * The bitmaps are not same for different nodes
428 * if RESYNCING is happening in one node, then
429 * the node which received the RESYNCING message
430 * probably will perform resync with the region
431 * [lo, hi] again, so we could reduce resync time
432 * a lot if we can ensure that the bitmaps among
433 * different nodes are match up well.
434 *
435 * sync_low/hi is used to record the region which
436 * arrived in the previous RESYNCING message,
437 *
438 * Call bitmap_sync_with_cluster to clear
439 * NEEDED_MASK and set RESYNC_MASK since
440 * resync thread is running in another node,
441 * so we don't need to do the resync again
442 * with the same section */
443 bitmap_sync_with_cluster(mddev, cinfo->sync_low,
444 cinfo->sync_hi,
445 lo, hi);
446 cinfo->sync_low = lo;
447 cinfo->sync_hi = hi;
448
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500449 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
450 if (!s)
451 return;
452 s->slot = slot;
453 s->lo = lo;
454 s->hi = hi;
Goldwyn Rodrigues9ed38ff52015-08-14 12:19:40 -0500455 mddev->pers->quiesce(mddev, 1);
456 mddev->pers->quiesce(mddev, 0);
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500457 spin_lock_irq(&cinfo->suspend_lock);
458 /* Remove existing entry (if exists) before adding */
459 __remove_suspend_info(cinfo, slot);
460 list_add(&s->list, &cinfo->suspend_list);
461 spin_unlock_irq(&cinfo->suspend_lock);
Goldwyn Rodriguesb8ca8462015-10-09 11:27:01 -0500462 mddev->pers->quiesce(mddev, 2);
Goldwyn Rodriguese59721c2014-06-07 02:30:30 -0500463}
464
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500465static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
466{
467 char disk_uuid[64];
468 struct md_cluster_info *cinfo = mddev->cluster_info;
469 char event_name[] = "EVENT=ADD_DEVICE";
470 char raid_slot[16];
471 char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
472 int len;
473
474 len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
Guoqing Jiangb89f7042015-07-10 16:54:02 +0800475 sprintf(disk_uuid + len, "%pU", cmsg->uuid);
Guoqing Jiangfaeff832015-10-12 17:21:21 +0800476 snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot));
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500477 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
478 init_completion(&cinfo->newdisk_completion);
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -0600479 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500480 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
481 wait_for_completion_timeout(&cinfo->newdisk_completion,
482 NEW_DEV_TIMEOUT);
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -0600483 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500484}
485
486
487static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
488{
489 struct md_cluster_info *cinfo = mddev->cluster_info;
Guoqing Jiang15858fa2015-12-21 10:51:00 +1100490 mddev->good_device_nr = le32_to_cpu(msg->raid_slot);
491 set_bit(MD_RELOAD_SB, &mddev->flags);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500492 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
Guoqing Jiang15858fa2015-12-21 10:51:00 +1100493 md_wakeup_thread(mddev->thread);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500494}
495
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500496static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
497{
Guoqing Jiangfaeff832015-10-12 17:21:21 +0800498 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev,
499 le32_to_cpu(msg->raid_slot));
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500500
Guoqing Jiang659b2542015-12-21 10:50:59 +1100501 if (rdev) {
502 set_bit(ClusterRemove, &rdev->flags);
503 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
504 md_wakeup_thread(mddev->thread);
505 }
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500506 else
Guoqing Jiangfaeff832015-10-12 17:21:21 +0800507 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n",
508 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500509}
510
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500511static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
512{
Guoqing Jiangfaeff832015-10-12 17:21:21 +0800513 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev,
514 le32_to_cpu(msg->raid_slot));
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500515
516 if (rdev && test_bit(Faulty, &rdev->flags))
517 clear_bit(Faulty, &rdev->flags);
518 else
Guoqing Jiangfaeff832015-10-12 17:21:21 +0800519 pr_warn("%s: %d Could not find disk(%d) which is faulty",
520 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500521}
522
Guoqing Jiang1fa9a1a2016-05-03 22:22:15 -0400523static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500524{
Guoqing Jiang1fa9a1a2016-05-03 22:22:15 -0400525 int ret = 0;
526
Guoqing Jiang256f5b22015-10-12 17:21:23 +0800527 if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot),
528 "node %d received it's own msg\n", le32_to_cpu(msg->slot)))
Guoqing Jiang1fa9a1a2016-05-03 22:22:15 -0400529 return -1;
Guoqing Jiangcf97a342015-10-16 15:40:22 +0800530 switch (le32_to_cpu(msg->type)) {
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500531 case METADATA_UPDATED:
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500532 process_metadata_update(mddev, msg);
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500533 break;
534 case RESYNCING:
Guoqing Jiangcf97a342015-10-16 15:40:22 +0800535 process_suspend_info(mddev, le32_to_cpu(msg->slot),
536 le64_to_cpu(msg->low),
537 le64_to_cpu(msg->high));
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500538 break;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500539 case NEWDISK:
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500540 process_add_new_disk(mddev, msg);
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500541 break;
542 case REMOVE:
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500543 process_remove_disk(mddev, msg);
544 break;
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500545 case RE_ADD:
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -0500546 process_readd_disk(mddev, msg);
547 break;
Guoqing Jiangdc737d72015-07-10 16:54:04 +0800548 case BITMAP_NEEDS_SYNC:
Guoqing Jiangcf97a342015-10-16 15:40:22 +0800549 __recover_slot(mddev, le32_to_cpu(msg->slot));
Guoqing Jiangdc737d72015-07-10 16:54:04 +0800550 break;
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500551 default:
Guoqing Jiang1fa9a1a2016-05-03 22:22:15 -0400552 ret = -1;
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -0500553 pr_warn("%s:%d Received unknown message from %d\n",
554 __func__, __LINE__, msg->slot);
kbuild test robot09dd1af2015-02-28 09:16:08 +0800555 }
Guoqing Jiang1fa9a1a2016-05-03 22:22:15 -0400556 return ret;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500557}
558
559/*
560 * thread for receiving message
561 */
562static void recv_daemon(struct md_thread *thread)
563{
564 struct md_cluster_info *cinfo = thread->mddev->cluster_info;
565 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
566 struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
567 struct cluster_msg msg;
Guoqing Jiangb5ef5672015-07-10 17:01:17 +0800568 int ret;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500569
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100570 mutex_lock(&cinfo->recv_mutex);
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500571 /*get CR on Message*/
572 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
573 pr_err("md/raid1:failed to get CR on MESSAGE\n");
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100574 mutex_unlock(&cinfo->recv_mutex);
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500575 return;
576 }
577
578 /* read lvb and wake up thread to process this message_lockres */
579 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
Guoqing Jiang1fa9a1a2016-05-03 22:22:15 -0400580 ret = process_recvd_msg(thread->mddev, &msg);
581 if (ret)
582 goto out;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500583
584 /*release CR on ack_lockres*/
Guoqing Jiangb5ef5672015-07-10 17:01:17 +0800585 ret = dlm_unlock_sync(ack_lockres);
586 if (unlikely(ret != 0))
587 pr_info("unlock ack failed return %d\n", ret);
Guoqing Jiang66099bb2015-07-10 17:01:15 +0800588 /*up-convert to PR on message_lockres*/
Guoqing Jiangb5ef5672015-07-10 17:01:17 +0800589 ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR);
590 if (unlikely(ret != 0))
591 pr_info("lock PR on msg failed return %d\n", ret);
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500592 /*get CR on ack_lockres again*/
Guoqing Jiangb5ef5672015-07-10 17:01:17 +0800593 ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
594 if (unlikely(ret != 0))
595 pr_info("lock CR on ack failed return %d\n", ret);
Guoqing Jiang1fa9a1a2016-05-03 22:22:15 -0400596out:
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500597 /*release CR on message_lockres*/
Guoqing Jiangb5ef5672015-07-10 17:01:17 +0800598 ret = dlm_unlock_sync(message_lockres);
599 if (unlikely(ret != 0))
600 pr_info("unlock msg failed return %d\n", ret);
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100601 mutex_unlock(&cinfo->recv_mutex);
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500602}
603
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100604/* lock_token()
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500605 * Takes the lock on the TOKEN lock resource so no other
606 * node can communicate while the operation is underway.
607 */
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100608static int lock_token(struct md_cluster_info *cinfo)
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500609{
610 int error;
611
612 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
613 if (error)
614 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
615 __func__, __LINE__, error);
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100616
617 /* Lock the receive sequence */
618 mutex_lock(&cinfo->recv_mutex);
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500619 return error;
620}
621
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100622/* lock_comm()
623 * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel.
624 */
625static int lock_comm(struct md_cluster_info *cinfo)
626{
627 wait_event(cinfo->wait,
628 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state));
629
630 return lock_token(cinfo);
631}
632
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500633static void unlock_comm(struct md_cluster_info *cinfo)
634{
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -0500635 WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX);
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100636 mutex_unlock(&cinfo->recv_mutex);
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500637 dlm_unlock_sync(cinfo->token_lockres);
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100638 clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state);
639 wake_up(&cinfo->wait);
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500640}
641
642/* __sendmsg()
643 * This function performs the actual sending of the message. This function is
644 * usually called after performing the encompassing operation
645 * The function:
646 * 1. Grabs the message lockresource in EX mode
647 * 2. Copies the message to the message LVB
Guoqing Jiang66099bb2015-07-10 17:01:15 +0800648 * 3. Downconverts message lockresource to CW
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500649 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
650 * and the other nodes read the message. The thread will wait here until all other
651 * nodes have released ack lock resource.
652 * 5. Downconvert ack lockresource to CR
653 */
654static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
655{
656 int error;
657 int slot = cinfo->slot_number - 1;
658
659 cmsg->slot = cpu_to_le32(slot);
660 /*get EX on Message*/
661 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
662 if (error) {
663 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
664 goto failed_message;
665 }
666
667 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
668 sizeof(struct cluster_msg));
Guoqing Jiang66099bb2015-07-10 17:01:15 +0800669 /*down-convert EX to CW on Message*/
670 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW);
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500671 if (error) {
Guoqing Jiang66099bb2015-07-10 17:01:15 +0800672 pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n",
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500673 error);
Guoqing Jiang66099bb2015-07-10 17:01:15 +0800674 goto failed_ack;
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500675 }
676
677 /*up-convert CR to EX on Ack*/
678 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
679 if (error) {
680 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
681 error);
682 goto failed_ack;
683 }
684
685 /*down-convert EX to CR on Ack*/
686 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
687 if (error) {
688 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
689 error);
690 goto failed_ack;
691 }
692
693failed_ack:
Guoqing Jiangb5ef5672015-07-10 17:01:17 +0800694 error = dlm_unlock_sync(cinfo->message_lockres);
695 if (unlikely(error != 0)) {
696 pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n",
697 error);
698 /* in case the message can't be released due to some reason */
699 goto failed_ack;
700 }
Goldwyn Rodrigues601b5152014-06-07 01:28:53 -0500701failed_message:
702 return error;
703}
704
705static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
706{
707 int ret;
708
709 lock_comm(cinfo);
710 ret = __sendmsg(cinfo, cmsg);
711 unlock_comm(cinfo);
712 return ret;
713}
714
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500715static int gather_all_resync_info(struct mddev *mddev, int total_slots)
716{
717 struct md_cluster_info *cinfo = mddev->cluster_info;
718 int i, ret = 0;
719 struct dlm_lock_resource *bm_lockres;
720 struct suspend_info *s;
721 char str[64];
Guoqing Jiangabb9b222015-07-10 17:01:22 +0800722 sector_t lo, hi;
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500723
724
725 for (i = 0; i < total_slots; i++) {
726 memset(str, '\0', 64);
727 snprintf(str, 64, "bitmap%04d", i);
728 bm_lockres = lockres_init(mddev, str, NULL, 1);
729 if (!bm_lockres)
730 return -ENOMEM;
Shaohua Li4ac7a652016-01-22 15:54:42 -0800731 if (i == (cinfo->slot_number - 1)) {
732 lockres_free(bm_lockres);
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500733 continue;
Shaohua Li4ac7a652016-01-22 15:54:42 -0800734 }
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500735
736 bm_lockres->flags |= DLM_LKF_NOQUEUE;
737 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
738 if (ret == -EAGAIN) {
739 memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE);
740 s = read_resync_info(mddev, bm_lockres);
741 if (s) {
742 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
743 __func__, __LINE__,
744 (unsigned long long) s->lo,
745 (unsigned long long) s->hi, i);
746 spin_lock_irq(&cinfo->suspend_lock);
747 s->slot = i;
748 list_add(&s->list, &cinfo->suspend_list);
749 spin_unlock_irq(&cinfo->suspend_lock);
750 }
751 ret = 0;
752 lockres_free(bm_lockres);
753 continue;
754 }
Guoqing Jiang6e6d9f22015-07-10 17:01:20 +0800755 if (ret) {
756 lockres_free(bm_lockres);
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500757 goto out;
Guoqing Jiang6e6d9f22015-07-10 17:01:20 +0800758 }
Guoqing Jiangabb9b222015-07-10 17:01:22 +0800759
760 /* Read the disk bitmap sb and check if it needs recovery */
761 ret = bitmap_copy_from_slot(mddev, i, &lo, &hi, false);
762 if (ret) {
763 pr_warn("md-cluster: Could not gather bitmaps from slot %d", i);
764 lockres_free(bm_lockres);
765 continue;
766 }
767 if ((hi > 0) && (lo < mddev->recovery_cp)) {
768 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
769 mddev->recovery_cp = lo;
770 md_check_recovery(mddev);
771 }
772
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500773 dlm_unlock_sync(bm_lockres);
774 lockres_free(bm_lockres);
775 }
776out:
777 return ret;
778}
779
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500780static int join(struct mddev *mddev, int nodes)
781{
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500782 struct md_cluster_info *cinfo;
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500783 int ret, ops_rv;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500784 char str[64];
785
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500786 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
787 if (!cinfo)
788 return -ENOMEM;
789
Guoqing Jiang9e3072e2015-07-10 17:01:18 +0800790 INIT_LIST_HEAD(&cinfo->suspend_list);
791 spin_lock_init(&cinfo->suspend_lock);
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500792 init_completion(&cinfo->completion);
Guoqing Jiangeece0752015-07-10 17:01:21 +0800793 set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100794 init_waitqueue_head(&cinfo->wait);
795 mutex_init(&cinfo->recv_mutex);
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500796
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500797 mddev->cluster_info = cinfo;
798
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500799 memset(str, 0, 64);
Guoqing Jiangb89f7042015-07-10 16:54:02 +0800800 sprintf(str, "%pU", mddev->uuid);
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500801 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
802 DLM_LSFL_FS, LVB_SIZE,
803 &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace);
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500804 if (ret)
805 goto err;
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500806 wait_for_completion(&cinfo->completion);
Guoqing Jiang8c58f022015-04-21 11:25:52 -0500807 if (nodes < cinfo->slot_number) {
808 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
809 cinfo->slot_number, nodes);
Goldwyn Rodriguesb97e92572014-06-06 11:50:56 -0500810 ret = -ERANGE;
811 goto err;
812 }
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500813 /* Initiate the communication resources */
814 ret = -ENOMEM;
815 cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
816 if (!cinfo->recv_thread) {
817 pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
818 goto err;
819 }
820 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
821 if (!cinfo->message_lockres)
822 goto err;
823 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
824 if (!cinfo->token_lockres)
825 goto err;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500826 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
827 if (!cinfo->no_new_dev_lockres)
828 goto err;
829
Guoqing Jiang15352122016-05-02 11:33:12 -0400830 ret = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
831 if (ret) {
832 ret = -EAGAIN;
833 pr_err("md-cluster: can't join cluster to avoid lock issue\n");
834 goto err;
835 }
836 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
837 if (!cinfo->ack_lockres)
838 goto err;
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500839 /* get sync CR lock on ACK. */
840 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
841 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
842 ret);
Guoqing Jiang15352122016-05-02 11:33:12 -0400843 dlm_unlock_sync(cinfo->token_lockres);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500844 /* get sync CR lock on no-new-dev. */
845 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
846 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
847
Goldwyn Rodrigues54519c52014-06-06 12:12:32 -0500848
849 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
850 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
851 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
852 if (!cinfo->bitmap_lockres)
853 goto err;
854 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
855 pr_err("Failed to get bitmap lock\n");
856 ret = -EINVAL;
857 goto err;
858 }
859
Goldwyn Rodriguesc186b122015-09-30 13:20:35 -0500860 cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0);
861 if (!cinfo->resync_lockres)
862 goto err;
863
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500864 return 0;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500865err:
Guoqing Jiang5b0fb332016-05-02 11:33:11 -0400866 md_unregister_thread(&cinfo->recovery_thread);
867 md_unregister_thread(&cinfo->recv_thread);
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500868 lockres_free(cinfo->message_lockres);
869 lockres_free(cinfo->token_lockres);
870 lockres_free(cinfo->ack_lockres);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500871 lockres_free(cinfo->no_new_dev_lockres);
Goldwyn Rodriguesc186b122015-09-30 13:20:35 -0500872 lockres_free(cinfo->resync_lockres);
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -0500873 lockres_free(cinfo->bitmap_lockres);
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500874 if (cinfo->lockspace)
875 dlm_release_lockspace(cinfo->lockspace, 2);
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500876 mddev->cluster_info = NULL;
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500877 kfree(cinfo);
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500878 return ret;
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500879}
880
Guoqing Jiang51e453a2016-05-04 02:17:09 -0400881static void load_bitmaps(struct mddev *mddev, int total_slots)
882{
883 struct md_cluster_info *cinfo = mddev->cluster_info;
884
885 /* load all the node's bitmap info for resync */
886 if (gather_all_resync_info(mddev, total_slots))
887 pr_err("md-cluster: failed to gather all resyn infos\n");
888 set_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state);
889 /* wake up recv thread in case something need to be handled */
890 if (test_and_clear_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state))
891 md_wakeup_thread(cinfo->recv_thread);
892}
893
Guoqing Jiang09995412015-10-01 00:09:18 +0800894static void resync_bitmap(struct mddev *mddev)
895{
896 struct md_cluster_info *cinfo = mddev->cluster_info;
897 struct cluster_msg cmsg = {0};
898 int err;
899
900 cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
901 err = sendmsg(cinfo, &cmsg);
902 if (err)
903 pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n",
904 __func__, __LINE__, err);
905}
906
Guoqing Jiangf6a2dc62015-12-21 10:51:00 +1100907static void unlock_all_bitmaps(struct mddev *mddev);
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500908static int leave(struct mddev *mddev)
909{
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500910 struct md_cluster_info *cinfo = mddev->cluster_info;
911
912 if (!cinfo)
913 return 0;
Guoqing Jiang09995412015-10-01 00:09:18 +0800914
915 /* BITMAP_NEEDS_SYNC message should be sent when node
916 * is leaving the cluster with dirty bitmap, also we
917 * can only deliver it when dlm connection is available */
918 if (cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector)
919 resync_bitmap(mddev);
920
Goldwyn Rodriguese94987d2014-06-07 00:45:22 -0500921 md_unregister_thread(&cinfo->recovery_thread);
Goldwyn Rodrigues46646802014-06-07 01:08:29 -0500922 md_unregister_thread(&cinfo->recv_thread);
923 lockres_free(cinfo->message_lockres);
924 lockres_free(cinfo->token_lockres);
925 lockres_free(cinfo->ack_lockres);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -0500926 lockres_free(cinfo->no_new_dev_lockres);
Shaohua Li4ac7a652016-01-22 15:54:42 -0800927 lockres_free(cinfo->resync_lockres);
Goldwyn Rodrigues54519c52014-06-06 12:12:32 -0500928 lockres_free(cinfo->bitmap_lockres);
Guoqing Jiangf6a2dc62015-12-21 10:51:00 +1100929 unlock_all_bitmaps(mddev);
Goldwyn Rodriguesc4ce8672014-03-29 10:20:02 -0500930 dlm_release_lockspace(cinfo->lockspace, 2);
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -0500931 return 0;
932}
933
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -0500934/* slot_number(): Returns the MD slot number to use
935 * DLM starts the slot numbers from 1, wheras cluster-md
936 * wants the number to be from zero, so we deduct one
937 */
938static int slot_number(struct mddev *mddev)
939{
940 struct md_cluster_info *cinfo = mddev->cluster_info;
941
942 return cinfo->slot_number - 1;
943}
944
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100945/*
946 * Check if the communication is already locked, else lock the communication
947 * channel.
948 * If it is already locked, token is in EX mode, and hence lock_token()
949 * should not be called.
950 */
Goldwyn Rodrigues293467a2014-06-07 01:44:51 -0500951static int metadata_update_start(struct mddev *mddev)
952{
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100953 struct md_cluster_info *cinfo = mddev->cluster_info;
954
955 wait_event(cinfo->wait,
956 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) ||
957 test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state));
958
959 /* If token is already locked, return 0 */
960 if (cinfo->token_lockres->mode == DLM_LOCK_EX)
961 return 0;
962
963 return lock_token(cinfo);
Goldwyn Rodrigues293467a2014-06-07 01:44:51 -0500964}
965
966static int metadata_update_finish(struct mddev *mddev)
967{
968 struct md_cluster_info *cinfo = mddev->cluster_info;
969 struct cluster_msg cmsg;
Goldwyn Rodrigues70bcecd2015-08-21 10:33:39 -0500970 struct md_rdev *rdev;
971 int ret = 0;
NeilBrownba2746b2015-10-16 13:48:35 +1100972 int raid_slot = -1;
Goldwyn Rodrigues293467a2014-06-07 01:44:51 -0500973
974 memset(&cmsg, 0, sizeof(cmsg));
975 cmsg.type = cpu_to_le32(METADATA_UPDATED);
Goldwyn Rodrigues70bcecd2015-08-21 10:33:39 -0500976 /* Pick up a good active device number to send.
977 */
978 rdev_for_each(rdev, mddev)
979 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) {
NeilBrownba2746b2015-10-16 13:48:35 +1100980 raid_slot = rdev->desc_nr;
Goldwyn Rodrigues70bcecd2015-08-21 10:33:39 -0500981 break;
982 }
NeilBrownba2746b2015-10-16 13:48:35 +1100983 if (raid_slot >= 0) {
984 cmsg.raid_slot = cpu_to_le32(raid_slot);
Goldwyn Rodrigues70bcecd2015-08-21 10:33:39 -0500985 ret = __sendmsg(cinfo, &cmsg);
NeilBrownba2746b2015-10-16 13:48:35 +1100986 } else
Goldwyn Rodrigues70bcecd2015-08-21 10:33:39 -0500987 pr_warn("md-cluster: No good device id found to send\n");
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100988 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
Goldwyn Rodrigues293467a2014-06-07 01:44:51 -0500989 unlock_comm(cinfo);
990 return ret;
991}
992
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -0500993static void metadata_update_cancel(struct mddev *mddev)
Goldwyn Rodrigues293467a2014-06-07 01:44:51 -0500994{
995 struct md_cluster_info *cinfo = mddev->cluster_info;
Guoqing Jiang8b9277c2015-12-21 10:51:00 +1100996 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -0500997 unlock_comm(cinfo);
Goldwyn Rodrigues293467a2014-06-07 01:44:51 -0500998}
999
Goldwyn Rodriguesc186b122015-09-30 13:20:35 -05001000static int resync_start(struct mddev *mddev)
1001{
1002 struct md_cluster_info *cinfo = mddev->cluster_info;
Goldwyn Rodriguesc186b122015-09-30 13:20:35 -05001003 return dlm_lock_sync(cinfo->resync_lockres, DLM_LOCK_EX);
1004}
1005
Goldwyn Rodriguesc40f3412015-08-19 08:14:42 +10001006static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
Goldwyn Rodrigues965400e2014-06-07 02:16:58 -05001007{
1008 struct md_cluster_info *cinfo = mddev->cluster_info;
Goldwyn Rodriguesac277c62015-12-21 10:50:59 +11001009 struct resync_info ri;
Guoqing Jiangaee177a2015-10-12 17:21:24 +08001010 struct cluster_msg cmsg = {0};
Goldwyn Rodrigues965400e2014-06-07 02:16:58 -05001011
Goldwyn Rodriguesac277c62015-12-21 10:50:59 +11001012 /* do not send zero again, if we have sent before */
1013 if (hi == 0) {
1014 memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
1015 if (le64_to_cpu(ri.hi) == 0)
1016 return 0;
1017 }
1018
NeilBrown30661b42015-10-19 15:44:00 +11001019 add_resync_info(cinfo->bitmap_lockres, lo, hi);
Goldwyn Rodriguesc40f3412015-08-19 08:14:42 +10001020 /* Re-acquire the lock to refresh LVB */
1021 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
Goldwyn Rodriguesc40f3412015-08-19 08:14:42 +10001022 cmsg.type = cpu_to_le32(RESYNCING);
Goldwyn Rodrigues965400e2014-06-07 02:16:58 -05001023 cmsg.low = cpu_to_le64(lo);
1024 cmsg.high = cpu_to_le64(hi);
Goldwyn Rodriguesc186b122015-09-30 13:20:35 -05001025
Goldwyn Rodrigues965400e2014-06-07 02:16:58 -05001026 return sendmsg(cinfo, &cmsg);
1027}
1028
Goldwyn Rodriguesc186b122015-09-30 13:20:35 -05001029static int resync_finish(struct mddev *mddev)
1030{
1031 struct md_cluster_info *cinfo = mddev->cluster_info;
Goldwyn Rodriguesc186b122015-09-30 13:20:35 -05001032 dlm_unlock_sync(cinfo->resync_lockres);
1033 return resync_info_update(mddev, 0, 0);
1034}
1035
Goldwyn Rodrigues90382ed2015-06-24 09:30:32 -05001036static int area_resyncing(struct mddev *mddev, int direction,
1037 sector_t lo, sector_t hi)
Goldwyn Rodrigues589a1c42014-06-07 02:39:37 -05001038{
1039 struct md_cluster_info *cinfo = mddev->cluster_info;
1040 int ret = 0;
1041 struct suspend_info *s;
1042
Goldwyn Rodrigues90382ed2015-06-24 09:30:32 -05001043 if ((direction == READ) &&
1044 test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state))
1045 return 1;
1046
Goldwyn Rodrigues589a1c42014-06-07 02:39:37 -05001047 spin_lock_irq(&cinfo->suspend_lock);
1048 if (list_empty(&cinfo->suspend_list))
1049 goto out;
1050 list_for_each_entry(s, &cinfo->suspend_list, list)
1051 if (hi > s->lo && lo < s->hi) {
1052 ret = 1;
1053 break;
1054 }
1055out:
1056 spin_unlock_irq(&cinfo->suspend_lock);
1057 return ret;
1058}
1059
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -05001060/* add_new_disk() - initiates a disk add
1061 * However, if this fails before writing md_update_sb(),
1062 * add_new_disk_cancel() must be called to release token lock
1063 */
1064static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev)
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -05001065{
1066 struct md_cluster_info *cinfo = mddev->cluster_info;
1067 struct cluster_msg cmsg;
1068 int ret = 0;
1069 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1070 char *uuid = sb->device_uuid;
1071
1072 memset(&cmsg, 0, sizeof(cmsg));
1073 cmsg.type = cpu_to_le32(NEWDISK);
1074 memcpy(cmsg.uuid, uuid, 16);
Guoqing Jiangfaeff832015-10-12 17:21:21 +08001075 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -05001076 lock_comm(cinfo);
1077 ret = __sendmsg(cinfo, &cmsg);
1078 if (ret)
1079 return ret;
1080 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
1081 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
1082 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
1083 /* Some node does not "see" the device */
1084 if (ret == -EAGAIN)
1085 ret = -ENOENT;
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -05001086 if (ret)
1087 unlock_comm(cinfo);
Guoqing Jiang8b9277c2015-12-21 10:51:00 +11001088 else {
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -05001089 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
Guoqing Jiange19508f2015-12-21 10:51:01 +11001090 /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which
1091 * will run soon after add_new_disk, the below path will be
1092 * invoked:
1093 * md_wakeup_thread(mddev->thread)
1094 * -> conf->thread (raid1d)
1095 * -> md_check_recovery -> md_update_sb
1096 * -> metadata_update_start/finish
1097 * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually.
1098 *
1099 * For other failure cases, metadata_update_cancel and
1100 * add_new_disk_cancel also clear below bit as well.
1101 * */
Guoqing Jiang8b9277c2015-12-21 10:51:00 +11001102 set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1103 wake_up(&cinfo->wait);
1104 }
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -05001105 return ret;
1106}
1107
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -05001108static void add_new_disk_cancel(struct mddev *mddev)
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -05001109{
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -05001110 struct md_cluster_info *cinfo = mddev->cluster_info;
Guoqing Jiang8b9277c2015-12-21 10:51:00 +11001111 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -05001112 unlock_comm(cinfo);
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -05001113}
1114
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -06001115static int new_disk_ack(struct mddev *mddev, bool ack)
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -05001116{
1117 struct md_cluster_info *cinfo = mddev->cluster_info;
1118
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -06001119 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
1120 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
1121 return -EINVAL;
1122 }
1123
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -05001124 if (ack)
1125 dlm_unlock_sync(cinfo->no_new_dev_lockres);
1126 complete(&cinfo->newdisk_completion);
Goldwyn Rodriguesfa8259d2015-03-02 10:55:49 -06001127 return 0;
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -05001128}
1129
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -05001130static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
1131{
Guoqing Jiangaee177a2015-10-12 17:21:24 +08001132 struct cluster_msg cmsg = {0};
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -05001133 struct md_cluster_info *cinfo = mddev->cluster_info;
Guoqing Jiangfaeff832015-10-12 17:21:21 +08001134 cmsg.type = cpu_to_le32(REMOVE);
1135 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
Goldwyn Rodrigues54a88392015-12-21 10:51:00 +11001136 return sendmsg(cinfo, &cmsg);
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -05001137}
1138
Guoqing Jiangf6a2dc62015-12-21 10:51:00 +11001139static int lock_all_bitmaps(struct mddev *mddev)
1140{
1141 int slot, my_slot, ret, held = 1, i = 0;
1142 char str[64];
1143 struct md_cluster_info *cinfo = mddev->cluster_info;
1144
1145 cinfo->other_bitmap_lockres = kzalloc((mddev->bitmap_info.nodes - 1) *
1146 sizeof(struct dlm_lock_resource *),
1147 GFP_KERNEL);
1148 if (!cinfo->other_bitmap_lockres) {
1149 pr_err("md: can't alloc mem for other bitmap locks\n");
1150 return 0;
1151 }
1152
1153 my_slot = slot_number(mddev);
1154 for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) {
1155 if (slot == my_slot)
1156 continue;
1157
1158 memset(str, '\0', 64);
1159 snprintf(str, 64, "bitmap%04d", slot);
1160 cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1);
1161 if (!cinfo->other_bitmap_lockres[i])
1162 return -ENOMEM;
1163
1164 cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE;
1165 ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW);
1166 if (ret)
1167 held = -1;
1168 i++;
1169 }
1170
1171 return held;
1172}
1173
1174static void unlock_all_bitmaps(struct mddev *mddev)
1175{
1176 struct md_cluster_info *cinfo = mddev->cluster_info;
1177 int i;
1178
1179 /* release other node's bitmap lock if they are existed */
1180 if (cinfo->other_bitmap_lockres) {
1181 for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) {
1182 if (cinfo->other_bitmap_lockres[i]) {
1183 dlm_unlock_sync(cinfo->other_bitmap_lockres[i]);
1184 lockres_free(cinfo->other_bitmap_lockres[i]);
1185 }
1186 }
1187 kfree(cinfo->other_bitmap_lockres);
1188 }
1189}
1190
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -05001191static int gather_bitmaps(struct md_rdev *rdev)
1192{
1193 int sn, err;
1194 sector_t lo, hi;
Guoqing Jiangaee177a2015-10-12 17:21:24 +08001195 struct cluster_msg cmsg = {0};
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -05001196 struct mddev *mddev = rdev->mddev;
1197 struct md_cluster_info *cinfo = mddev->cluster_info;
1198
Guoqing Jiangfaeff832015-10-12 17:21:21 +08001199 cmsg.type = cpu_to_le32(RE_ADD);
1200 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -05001201 err = sendmsg(cinfo, &cmsg);
1202 if (err)
1203 goto out;
1204
1205 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
1206 if (sn == (cinfo->slot_number - 1))
1207 continue;
1208 err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
1209 if (err) {
1210 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
1211 goto out;
1212 }
1213 if ((hi > 0) && (lo < mddev->recovery_cp))
1214 mddev->recovery_cp = lo;
1215 }
1216out:
1217 return err;
1218}
1219
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -05001220static struct md_cluster_operations cluster_ops = {
1221 .join = join,
1222 .leave = leave,
Goldwyn Rodriguescf921cc2014-03-30 00:42:49 -05001223 .slot_number = slot_number,
Goldwyn Rodriguesc186b122015-09-30 13:20:35 -05001224 .resync_start = resync_start,
1225 .resync_finish = resync_finish,
Goldwyn Rodrigues96ae9232014-06-06 12:35:34 -05001226 .resync_info_update = resync_info_update,
Goldwyn Rodrigues293467a2014-06-07 01:44:51 -05001227 .metadata_update_start = metadata_update_start,
1228 .metadata_update_finish = metadata_update_finish,
1229 .metadata_update_cancel = metadata_update_cancel,
Goldwyn Rodrigues589a1c42014-06-07 02:39:37 -05001230 .area_resyncing = area_resyncing,
Goldwyn Rodriguesdbb64f82015-10-01 13:20:27 -05001231 .add_new_disk = add_new_disk,
1232 .add_new_disk_cancel = add_new_disk_cancel,
Goldwyn Rodrigues1aee41f2014-10-29 18:51:31 -05001233 .new_disk_ack = new_disk_ack,
Goldwyn Rodrigues88bcfef2015-04-14 10:44:44 -05001234 .remove_disk = remove_disk,
Guoqing Jiang51e453a2016-05-04 02:17:09 -04001235 .load_bitmaps = load_bitmaps,
Goldwyn Rodrigues97f6cd32015-04-14 10:45:42 -05001236 .gather_bitmaps = gather_bitmaps,
Guoqing Jiangf6a2dc62015-12-21 10:51:00 +11001237 .lock_all_bitmaps = lock_all_bitmaps,
1238 .unlock_all_bitmaps = unlock_all_bitmaps,
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -05001239};
1240
Goldwyn Rodrigues8e854e92014-03-07 11:21:15 -06001241static int __init cluster_init(void)
1242{
1243 pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");
1244 pr_info("Registering Cluster MD functions\n");
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -05001245 register_md_cluster_operations(&cluster_ops, THIS_MODULE);
Goldwyn Rodrigues8e854e92014-03-07 11:21:15 -06001246 return 0;
1247}
1248
1249static void cluster_exit(void)
1250{
Goldwyn Rodriguesedb39c92014-03-29 10:01:53 -05001251 unregister_md_cluster_operations();
Goldwyn Rodrigues8e854e92014-03-07 11:21:15 -06001252}
1253
1254module_init(cluster_init);
1255module_exit(cluster_exit);
Guoqing Jiang86b57272015-10-12 17:21:25 +08001256MODULE_AUTHOR("SUSE");
Goldwyn Rodrigues8e854e92014-03-07 11:21:15 -06001257MODULE_LICENSE("GPL");
1258MODULE_DESCRIPTION("Clustering support for MD");