Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * dlmdomain.c |
| 5 | * |
| 6 | * defines domain join / leave apis |
| 7 | * |
| 8 | * Copyright (C) 2004 Oracle. All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public |
| 12 | * License as published by the Free Software Foundation; either |
| 13 | * version 2 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public |
| 21 | * License along with this program; if not, write to the |
| 22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 23 | * Boston, MA 021110-1307, USA. |
| 24 | * |
| 25 | */ |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/types.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/highmem.h> |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 31 | #include <linux/init.h> |
| 32 | #include <linux/spinlock.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/err.h> |
Sunil Mushran | 6325b4a | 2008-03-10 15:16:22 -0700 | [diff] [blame] | 35 | #include <linux/debugfs.h> |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 36 | |
| 37 | #include "cluster/heartbeat.h" |
| 38 | #include "cluster/nodemanager.h" |
| 39 | #include "cluster/tcp.h" |
| 40 | |
| 41 | #include "dlmapi.h" |
| 42 | #include "dlmcommon.h" |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 43 | #include "dlmdomain.h" |
Sunil Mushran | 6325b4a | 2008-03-10 15:16:22 -0700 | [diff] [blame] | 44 | #include "dlmdebug.h" |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 45 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 46 | #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN) |
| 47 | #include "cluster/masklog.h" |
| 48 | |
Srinivas Eeda | 1faf289 | 2007-01-29 15:31:35 -0800 | [diff] [blame] | 49 | /* |
| 50 | * ocfs2 node maps are array of long int, which limits to send them freely |
| 51 | * across the wire due to endianness issues. To workaround this, we convert |
| 52 | * long ints to byte arrays. Following 3 routines are helper functions to |
| 53 | * set/test/copy bits within those array of bytes |
| 54 | */ |
| 55 | static inline void byte_set_bit(u8 nr, u8 map[]) |
| 56 | { |
| 57 | map[nr >> 3] |= (1UL << (nr & 7)); |
| 58 | } |
| 59 | |
| 60 | static inline int byte_test_bit(u8 nr, u8 map[]) |
| 61 | { |
| 62 | return ((1UL << (nr & 7)) & (map[nr >> 3])) != 0; |
| 63 | } |
| 64 | |
| 65 | static inline void byte_copymap(u8 dmap[], unsigned long smap[], |
| 66 | unsigned int sz) |
| 67 | { |
| 68 | unsigned int nn; |
| 69 | |
| 70 | if (!sz) |
| 71 | return; |
| 72 | |
| 73 | memset(dmap, 0, ((sz + 7) >> 3)); |
| 74 | for (nn = 0 ; nn < sz; nn++) |
| 75 | if (test_bit(nn, smap)) |
| 76 | byte_set_bit(nn, dmap); |
| 77 | } |
| 78 | |
Daniel Phillips | 03d864c | 2006-03-10 18:08:16 -0800 | [diff] [blame] | 79 | static void dlm_free_pagevec(void **vec, int pages) |
| 80 | { |
| 81 | while (pages--) |
| 82 | free_page((unsigned long)vec[pages]); |
| 83 | kfree(vec); |
| 84 | } |
| 85 | |
| 86 | static void **dlm_alloc_pagevec(int pages) |
| 87 | { |
| 88 | void **vec = kmalloc(pages * sizeof(void *), GFP_KERNEL); |
| 89 | int i; |
| 90 | |
| 91 | if (!vec) |
| 92 | return NULL; |
| 93 | |
| 94 | for (i = 0; i < pages; i++) |
| 95 | if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL))) |
| 96 | goto out_free; |
Joel Becker | c8f33b6 | 2006-03-16 17:40:37 -0800 | [diff] [blame] | 97 | |
Mark Fasheh | 685f1ad | 2006-03-23 11:23:29 -0800 | [diff] [blame] | 98 | mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n", |
Mark Fasheh | f5a923d | 2006-11-28 15:13:18 -0800 | [diff] [blame] | 99 | pages, (unsigned long)DLM_HASH_PAGES, |
| 100 | (unsigned long)DLM_BUCKETS_PER_PAGE); |
Daniel Phillips | 03d864c | 2006-03-10 18:08:16 -0800 | [diff] [blame] | 101 | return vec; |
| 102 | out_free: |
| 103 | dlm_free_pagevec(vec, i); |
| 104 | return NULL; |
| 105 | } |
| 106 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 107 | /* |
| 108 | * |
| 109 | * spinlock lock ordering: if multiple locks are needed, obey this ordering: |
| 110 | * dlm_domain_lock |
| 111 | * struct dlm_ctxt->spinlock |
| 112 | * struct dlm_lock_resource->spinlock |
| 113 | * struct dlm_ctxt->master_lock |
| 114 | * struct dlm_ctxt->ast_lock |
| 115 | * dlm_master_list_entry->spinlock |
| 116 | * dlm_lock->spinlock |
| 117 | * |
| 118 | */ |
| 119 | |
Ingo Molnar | 34af946 | 2006-06-27 02:53:55 -0700 | [diff] [blame] | 120 | DEFINE_SPINLOCK(dlm_domain_lock); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 121 | LIST_HEAD(dlm_domains); |
| 122 | static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events); |
| 123 | |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 124 | /* |
| 125 | * The supported protocol version for DLM communication. Running domains |
| 126 | * will have a negotiated version with the same major number and a minor |
| 127 | * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should |
| 128 | * be used to determine what a running domain is actually using. |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 129 | * |
| 130 | * New in version 1.1: |
| 131 | * - Message DLM_QUERY_REGION added to support global heartbeat |
Sunil Mushran | 18cfdf1 | 2010-10-07 16:47:03 -0700 | [diff] [blame] | 132 | * - Message DLM_QUERY_NODEINFO added to allow online node removes |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 133 | * New in version 1.2: |
| 134 | * - Message DLM_BEGIN_EXIT_DOMAIN_MSG added to mark start of exit domain |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 135 | */ |
| 136 | static const struct dlm_protocol_version dlm_protocol = { |
| 137 | .pv_major = 1, |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 138 | .pv_minor = 2, |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 139 | }; |
| 140 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 141 | #define DLM_DOMAIN_BACKOFF_MS 200 |
| 142 | |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 143 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
| 144 | void **ret_data); |
| 145 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, |
| 146 | void **ret_data); |
| 147 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, |
| 148 | void **ret_data); |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 149 | static int dlm_query_region_handler(struct o2net_msg *msg, u32 len, |
| 150 | void *data, void **ret_data); |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 151 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
| 152 | void **ret_data); |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 153 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, |
| 154 | struct dlm_protocol_version *request); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 155 | |
| 156 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm); |
| 157 | |
Sunil Mushran | e9f0b6a | 2011-07-24 10:27:54 -0700 | [diff] [blame] | 158 | void __dlm_unhash_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 159 | { |
Sunil Mushran | e9f0b6a | 2011-07-24 10:27:54 -0700 | [diff] [blame] | 160 | if (hlist_unhashed(&res->hash_node)) |
| 161 | return; |
| 162 | |
| 163 | mlog(0, "%s: Unhash res %.*s\n", dlm->name, res->lockname.len, |
| 164 | res->lockname.name); |
| 165 | hlist_del_init(&res->hash_node); |
| 166 | dlm_lockres_put(res); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 167 | } |
| 168 | |
Sunil Mushran | e9f0b6a | 2011-07-24 10:27:54 -0700 | [diff] [blame] | 169 | void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 170 | { |
Mark Fasheh | 81f2094 | 2006-02-28 17:31:22 -0800 | [diff] [blame] | 171 | struct hlist_head *bucket; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 172 | struct qstr *q; |
| 173 | |
| 174 | assert_spin_locked(&dlm->spinlock); |
| 175 | |
| 176 | q = &res->lockname; |
Daniel Phillips | 03d864c | 2006-03-10 18:08:16 -0800 | [diff] [blame] | 177 | bucket = dlm_lockres_hash(dlm, q->hash); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 178 | |
| 179 | /* get a reference for our hashtable */ |
| 180 | dlm_lockres_get(res); |
| 181 | |
Mark Fasheh | 81f2094 | 2006-02-28 17:31:22 -0800 | [diff] [blame] | 182 | hlist_add_head(&res->hash_node, bucket); |
Sunil Mushran | e9f0b6a | 2011-07-24 10:27:54 -0700 | [diff] [blame] | 183 | |
| 184 | mlog(0, "%s: Hash res %.*s\n", dlm->name, res->lockname.len, |
| 185 | res->lockname.name); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 186 | } |
| 187 | |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 188 | struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm, |
| 189 | const char *name, |
| 190 | unsigned int len, |
| 191 | unsigned int hash) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 192 | { |
Mark Fasheh | 81f2094 | 2006-02-28 17:31:22 -0800 | [diff] [blame] | 193 | struct hlist_head *bucket; |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 194 | struct dlm_lock_resource *res; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 195 | |
Tao Ma | ef6b689 | 2011-02-21 11:10:44 +0800 | [diff] [blame] | 196 | mlog(0, "%.*s\n", len, name); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 197 | |
| 198 | assert_spin_locked(&dlm->spinlock); |
| 199 | |
Daniel Phillips | 03d864c | 2006-03-10 18:08:16 -0800 | [diff] [blame] | 200 | bucket = dlm_lockres_hash(dlm, hash); |
| 201 | |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 202 | hlist_for_each_entry(res, bucket, hash_node) { |
Daniel Phillips | 4198985 | 2006-03-10 13:31:47 -0800 | [diff] [blame] | 203 | if (res->lockname.name[0] != name[0]) |
| 204 | continue; |
| 205 | if (unlikely(res->lockname.len != len)) |
| 206 | continue; |
| 207 | if (memcmp(res->lockname.name + 1, name + 1, len - 1)) |
| 208 | continue; |
| 209 | dlm_lockres_get(res); |
| 210 | return res; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 211 | } |
Daniel Phillips | 4198985 | 2006-03-10 13:31:47 -0800 | [diff] [blame] | 212 | return NULL; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 213 | } |
| 214 | |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 215 | /* intended to be called by functions which do not care about lock |
| 216 | * resources which are being purged (most net _handler functions). |
| 217 | * this will return NULL for any lock resource which is found but |
| 218 | * currently in the process of dropping its mastery reference. |
| 219 | * use __dlm_lookup_lockres_full when you need the lock resource |
| 220 | * regardless (e.g. dlm_get_lock_resource) */ |
| 221 | struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, |
| 222 | const char *name, |
| 223 | unsigned int len, |
| 224 | unsigned int hash) |
| 225 | { |
| 226 | struct dlm_lock_resource *res = NULL; |
| 227 | |
Tao Ma | ef6b689 | 2011-02-21 11:10:44 +0800 | [diff] [blame] | 228 | mlog(0, "%.*s\n", len, name); |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 229 | |
| 230 | assert_spin_locked(&dlm->spinlock); |
| 231 | |
| 232 | res = __dlm_lookup_lockres_full(dlm, name, len, hash); |
| 233 | if (res) { |
| 234 | spin_lock(&res->spinlock); |
| 235 | if (res->state & DLM_LOCK_RES_DROPPING_REF) { |
| 236 | spin_unlock(&res->spinlock); |
| 237 | dlm_lockres_put(res); |
| 238 | return NULL; |
| 239 | } |
| 240 | spin_unlock(&res->spinlock); |
| 241 | } |
| 242 | |
| 243 | return res; |
| 244 | } |
| 245 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 246 | struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm, |
| 247 | const char *name, |
| 248 | unsigned int len) |
| 249 | { |
| 250 | struct dlm_lock_resource *res; |
Mark Fasheh | a3d3329 | 2006-03-09 17:55:56 -0800 | [diff] [blame] | 251 | unsigned int hash = dlm_lockid_hash(name, len); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 252 | |
| 253 | spin_lock(&dlm->spinlock); |
Mark Fasheh | a3d3329 | 2006-03-09 17:55:56 -0800 | [diff] [blame] | 254 | res = __dlm_lookup_lockres(dlm, name, len, hash); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 255 | spin_unlock(&dlm->spinlock); |
| 256 | return res; |
| 257 | } |
| 258 | |
| 259 | static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len) |
| 260 | { |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 261 | struct dlm_ctxt *tmp; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 262 | |
| 263 | assert_spin_locked(&dlm_domain_lock); |
| 264 | |
| 265 | /* tmp->name here is always NULL terminated, |
| 266 | * but domain may not be! */ |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 267 | list_for_each_entry(tmp, &dlm_domains, list) { |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 268 | if (strlen(tmp->name) == len && |
| 269 | memcmp(tmp->name, domain, len)==0) |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 270 | return tmp; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 271 | } |
| 272 | |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 273 | return NULL; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 274 | } |
| 275 | |
| 276 | /* For null terminated domain strings ONLY */ |
| 277 | static struct dlm_ctxt * __dlm_lookup_domain(const char *domain) |
| 278 | { |
| 279 | assert_spin_locked(&dlm_domain_lock); |
| 280 | |
| 281 | return __dlm_lookup_domain_full(domain, strlen(domain)); |
| 282 | } |
| 283 | |
| 284 | |
| 285 | /* returns true on one of two conditions: |
| 286 | * 1) the domain does not exist |
| 287 | * 2) the domain exists and it's state is "joined" */ |
| 288 | static int dlm_wait_on_domain_helper(const char *domain) |
| 289 | { |
| 290 | int ret = 0; |
| 291 | struct dlm_ctxt *tmp = NULL; |
| 292 | |
| 293 | spin_lock(&dlm_domain_lock); |
| 294 | |
| 295 | tmp = __dlm_lookup_domain(domain); |
| 296 | if (!tmp) |
| 297 | ret = 1; |
| 298 | else if (tmp->dlm_state == DLM_CTXT_JOINED) |
| 299 | ret = 1; |
| 300 | |
| 301 | spin_unlock(&dlm_domain_lock); |
| 302 | return ret; |
| 303 | } |
| 304 | |
| 305 | static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm) |
| 306 | { |
Sunil Mushran | 6325b4a | 2008-03-10 15:16:22 -0700 | [diff] [blame] | 307 | dlm_destroy_debugfs_subroot(dlm); |
| 308 | |
Mark Fasheh | 81f2094 | 2006-02-28 17:31:22 -0800 | [diff] [blame] | 309 | if (dlm->lockres_hash) |
Daniel Phillips | 03d864c | 2006-03-10 18:08:16 -0800 | [diff] [blame] | 310 | dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 311 | |
Sunil Mushran | e2b66dd | 2009-02-26 15:00:40 -0800 | [diff] [blame] | 312 | if (dlm->master_hash) |
| 313 | dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES); |
| 314 | |
Tim Gardner | d787ab0 | 2013-02-21 16:42:44 -0800 | [diff] [blame] | 315 | kfree(dlm->name); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 316 | kfree(dlm); |
| 317 | } |
| 318 | |
| 319 | /* A little strange - this function will be called while holding |
| 320 | * dlm_domain_lock and is expected to be holding it on the way out. We |
| 321 | * will however drop and reacquire it multiple times */ |
| 322 | static void dlm_ctxt_release(struct kref *kref) |
| 323 | { |
| 324 | struct dlm_ctxt *dlm; |
| 325 | |
| 326 | dlm = container_of(kref, struct dlm_ctxt, dlm_refs); |
| 327 | |
| 328 | BUG_ON(dlm->num_joins); |
| 329 | BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED); |
| 330 | |
| 331 | /* we may still be in the list if we hit an error during join. */ |
| 332 | list_del_init(&dlm->list); |
| 333 | |
| 334 | spin_unlock(&dlm_domain_lock); |
| 335 | |
| 336 | mlog(0, "freeing memory from domain %s\n", dlm->name); |
| 337 | |
| 338 | wake_up(&dlm_domain_events); |
| 339 | |
| 340 | dlm_free_ctxt_mem(dlm); |
| 341 | |
| 342 | spin_lock(&dlm_domain_lock); |
| 343 | } |
| 344 | |
| 345 | void dlm_put(struct dlm_ctxt *dlm) |
| 346 | { |
| 347 | spin_lock(&dlm_domain_lock); |
| 348 | kref_put(&dlm->dlm_refs, dlm_ctxt_release); |
| 349 | spin_unlock(&dlm_domain_lock); |
| 350 | } |
| 351 | |
| 352 | static void __dlm_get(struct dlm_ctxt *dlm) |
| 353 | { |
| 354 | kref_get(&dlm->dlm_refs); |
| 355 | } |
| 356 | |
| 357 | /* given a questionable reference to a dlm object, gets a reference if |
| 358 | * it can find it in the list, otherwise returns NULL in which case |
| 359 | * you shouldn't trust your pointer. */ |
| 360 | struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm) |
| 361 | { |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 362 | struct dlm_ctxt *target; |
| 363 | struct dlm_ctxt *ret = NULL; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 364 | |
| 365 | spin_lock(&dlm_domain_lock); |
| 366 | |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 367 | list_for_each_entry(target, &dlm_domains, list) { |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 368 | if (target == dlm) { |
| 369 | __dlm_get(target); |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 370 | ret = target; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 371 | break; |
| 372 | } |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | spin_unlock(&dlm_domain_lock); |
| 376 | |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 377 | return ret; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | int dlm_domain_fully_joined(struct dlm_ctxt *dlm) |
| 381 | { |
| 382 | int ret; |
| 383 | |
| 384 | spin_lock(&dlm_domain_lock); |
| 385 | ret = (dlm->dlm_state == DLM_CTXT_JOINED) || |
| 386 | (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN); |
| 387 | spin_unlock(&dlm_domain_lock); |
| 388 | |
| 389 | return ret; |
| 390 | } |
| 391 | |
Kurt Hackel | 3156d26 | 2006-05-01 14:39:29 -0700 | [diff] [blame] | 392 | static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm) |
| 393 | { |
| 394 | if (dlm->dlm_worker) { |
| 395 | flush_workqueue(dlm->dlm_worker); |
| 396 | destroy_workqueue(dlm->dlm_worker); |
| 397 | dlm->dlm_worker = NULL; |
| 398 | } |
| 399 | } |
| 400 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 401 | static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm) |
| 402 | { |
| 403 | dlm_unregister_domain_handlers(dlm); |
Sunil Mushran | 007dce5 | 2008-03-10 15:16:23 -0700 | [diff] [blame] | 404 | dlm_debug_shutdown(dlm); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 405 | dlm_complete_thread(dlm); |
| 406 | dlm_complete_recovery_thread(dlm); |
Kurt Hackel | 3156d26 | 2006-05-01 14:39:29 -0700 | [diff] [blame] | 407 | dlm_destroy_dlm_worker(dlm); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 408 | |
| 409 | /* We've left the domain. Now we can take ourselves out of the |
| 410 | * list and allow the kref stuff to help us free the |
| 411 | * memory. */ |
| 412 | spin_lock(&dlm_domain_lock); |
| 413 | list_del_init(&dlm->list); |
| 414 | spin_unlock(&dlm_domain_lock); |
| 415 | |
| 416 | /* Wake up anyone waiting for us to remove this domain */ |
| 417 | wake_up(&dlm_domain_events); |
| 418 | } |
| 419 | |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 420 | static int dlm_migrate_all_locks(struct dlm_ctxt *dlm) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 421 | { |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 422 | int i, num, n, ret = 0; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 423 | struct dlm_lock_resource *res; |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 424 | struct hlist_node *iter; |
| 425 | struct hlist_head *bucket; |
| 426 | int dropped; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 427 | |
| 428 | mlog(0, "Migrating locks from domain %s\n", dlm->name); |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 429 | |
| 430 | num = 0; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 431 | spin_lock(&dlm->spinlock); |
Mark Fasheh | 81f2094 | 2006-02-28 17:31:22 -0800 | [diff] [blame] | 432 | for (i = 0; i < DLM_HASH_BUCKETS; i++) { |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 433 | redo_bucket: |
| 434 | n = 0; |
| 435 | bucket = dlm_lockres_hash(dlm, i); |
| 436 | iter = bucket->first; |
| 437 | while (iter) { |
| 438 | n++; |
| 439 | res = hlist_entry(iter, struct dlm_lock_resource, |
| 440 | hash_node); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 441 | dlm_lockres_get(res); |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 442 | /* migrate, if necessary. this will drop the dlm |
| 443 | * spinlock and retake it if it does migration. */ |
| 444 | dropped = dlm_empty_lockres(dlm, res); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 445 | |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 446 | spin_lock(&res->spinlock); |
Sunil Mushran | 66effd3 | 2011-05-19 14:34:12 -0700 | [diff] [blame] | 447 | if (dropped) |
| 448 | __dlm_lockres_calc_usage(dlm, res); |
| 449 | else |
| 450 | iter = res->hash_node.next; |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 451 | spin_unlock(&res->spinlock); |
| 452 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 453 | dlm_lockres_put(res); |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 454 | |
Sunil Mushran | 66effd3 | 2011-05-19 14:34:12 -0700 | [diff] [blame] | 455 | if (dropped) { |
| 456 | cond_resched_lock(&dlm->spinlock); |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 457 | goto redo_bucket; |
Sunil Mushran | 66effd3 | 2011-05-19 14:34:12 -0700 | [diff] [blame] | 458 | } |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 459 | } |
Sunil Mushran | 0d01af6 | 2007-04-17 13:32:20 -0700 | [diff] [blame] | 460 | cond_resched_lock(&dlm->spinlock); |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 461 | num += n; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 462 | } |
| 463 | spin_unlock(&dlm->spinlock); |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 464 | wake_up(&dlm->dlm_thread_wq); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 465 | |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 466 | /* let the dlm thread take care of purging, keep scanning until |
| 467 | * nothing remains in the hash */ |
| 468 | if (num) { |
| 469 | mlog(0, "%s: %d lock resources in hash last pass\n", |
| 470 | dlm->name, num); |
| 471 | ret = -EAGAIN; |
| 472 | } |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 473 | mlog(0, "DONE Migrating locks from domain %s\n", dlm->name); |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 474 | return ret; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | static int dlm_no_joining_node(struct dlm_ctxt *dlm) |
| 478 | { |
| 479 | int ret; |
| 480 | |
| 481 | spin_lock(&dlm->spinlock); |
| 482 | ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN; |
| 483 | spin_unlock(&dlm->spinlock); |
| 484 | |
| 485 | return ret; |
| 486 | } |
| 487 | |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 488 | static int dlm_begin_exit_domain_handler(struct o2net_msg *msg, u32 len, |
| 489 | void *data, void **ret_data) |
| 490 | { |
| 491 | struct dlm_ctxt *dlm = data; |
| 492 | unsigned int node; |
| 493 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; |
| 494 | |
| 495 | if (!dlm_grab(dlm)) |
| 496 | return 0; |
| 497 | |
| 498 | node = exit_msg->node_idx; |
| 499 | mlog(0, "%s: Node %u sent a begin exit domain message\n", dlm->name, node); |
| 500 | |
| 501 | spin_lock(&dlm->spinlock); |
| 502 | set_bit(node, dlm->exit_domain_map); |
| 503 | spin_unlock(&dlm->spinlock); |
| 504 | |
| 505 | dlm_put(dlm); |
| 506 | |
| 507 | return 0; |
| 508 | } |
| 509 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 510 | static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm) |
| 511 | { |
| 512 | /* Yikes, a double spinlock! I need domain_lock for the dlm |
| 513 | * state and the dlm spinlock for join state... Sorry! */ |
| 514 | again: |
| 515 | spin_lock(&dlm_domain_lock); |
| 516 | spin_lock(&dlm->spinlock); |
| 517 | |
| 518 | if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { |
| 519 | mlog(0, "Node %d is joining, we wait on it.\n", |
| 520 | dlm->joining_node); |
| 521 | spin_unlock(&dlm->spinlock); |
| 522 | spin_unlock(&dlm_domain_lock); |
| 523 | |
| 524 | wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm)); |
| 525 | goto again; |
| 526 | } |
| 527 | |
| 528 | dlm->dlm_state = DLM_CTXT_LEAVING; |
| 529 | spin_unlock(&dlm->spinlock); |
| 530 | spin_unlock(&dlm_domain_lock); |
| 531 | } |
| 532 | |
| 533 | static void __dlm_print_nodes(struct dlm_ctxt *dlm) |
| 534 | { |
Sunil Mushran | 8decab3 | 2011-07-24 10:23:54 -0700 | [diff] [blame] | 535 | int node = -1, num = 0; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 536 | |
| 537 | assert_spin_locked(&dlm->spinlock); |
| 538 | |
Sunil Mushran | 8decab3 | 2011-07-24 10:23:54 -0700 | [diff] [blame] | 539 | printk("( "); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 540 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, |
| 541 | node + 1)) < O2NM_MAX_NODES) { |
Sunil Mushran | 781ee3e | 2006-04-27 16:41:31 -0700 | [diff] [blame] | 542 | printk("%d ", node); |
Sunil Mushran | 8decab3 | 2011-07-24 10:23:54 -0700 | [diff] [blame] | 543 | ++num; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 544 | } |
Sunil Mushran | 8decab3 | 2011-07-24 10:23:54 -0700 | [diff] [blame] | 545 | printk(") %u nodes\n", num); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 546 | } |
| 547 | |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 548 | static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data, |
| 549 | void **ret_data) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 550 | { |
| 551 | struct dlm_ctxt *dlm = data; |
| 552 | unsigned int node; |
| 553 | struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf; |
| 554 | |
Tao Ma | ef6b689 | 2011-02-21 11:10:44 +0800 | [diff] [blame] | 555 | mlog(0, "%p %u %p", msg, len, data); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 556 | |
| 557 | if (!dlm_grab(dlm)) |
| 558 | return 0; |
| 559 | |
| 560 | node = exit_msg->node_idx; |
| 561 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 562 | spin_lock(&dlm->spinlock); |
| 563 | clear_bit(node, dlm->domain_map); |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 564 | clear_bit(node, dlm->exit_domain_map); |
Sunil Mushran | 8decab3 | 2011-07-24 10:23:54 -0700 | [diff] [blame] | 565 | printk(KERN_NOTICE "o2dlm: Node %u leaves domain %s ", node, dlm->name); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 566 | __dlm_print_nodes(dlm); |
| 567 | |
| 568 | /* notify anything attached to the heartbeat events */ |
| 569 | dlm_hb_event_notify_attached(dlm, node, 0); |
| 570 | |
| 571 | spin_unlock(&dlm->spinlock); |
| 572 | |
| 573 | dlm_put(dlm); |
| 574 | |
| 575 | return 0; |
| 576 | } |
| 577 | |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 578 | static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, u32 msg_type, |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 579 | unsigned int node) |
| 580 | { |
| 581 | int status; |
| 582 | struct dlm_exit_domain leave_msg; |
| 583 | |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 584 | mlog(0, "%s: Sending domain exit message %u to node %u\n", dlm->name, |
| 585 | msg_type, node); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 586 | |
| 587 | memset(&leave_msg, 0, sizeof(leave_msg)); |
| 588 | leave_msg.node_idx = dlm->node_num; |
| 589 | |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 590 | status = o2net_send_message(msg_type, dlm->key, &leave_msg, |
| 591 | sizeof(leave_msg), node, NULL); |
Wengang Wang | a5196ec | 2010-03-30 12:09:22 +0800 | [diff] [blame] | 592 | if (status < 0) |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 593 | mlog(ML_ERROR, "Error %d sending domain exit message %u " |
| 594 | "to node %u on domain %s\n", status, msg_type, node, |
| 595 | dlm->name); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 596 | |
| 597 | return status; |
| 598 | } |
| 599 | |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 600 | static void dlm_begin_exit_domain(struct dlm_ctxt *dlm) |
| 601 | { |
| 602 | int node = -1; |
| 603 | |
| 604 | /* Support for begin exit domain was added in 1.2 */ |
| 605 | if (dlm->dlm_locking_proto.pv_major == 1 && |
| 606 | dlm->dlm_locking_proto.pv_minor < 2) |
| 607 | return; |
| 608 | |
| 609 | /* |
| 610 | * Unlike DLM_EXIT_DOMAIN_MSG, DLM_BEGIN_EXIT_DOMAIN_MSG is purely |
| 611 | * informational. Meaning if a node does not receive the message, |
| 612 | * so be it. |
| 613 | */ |
| 614 | spin_lock(&dlm->spinlock); |
| 615 | while (1) { |
| 616 | node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, node + 1); |
| 617 | if (node >= O2NM_MAX_NODES) |
| 618 | break; |
| 619 | if (node == dlm->node_num) |
| 620 | continue; |
| 621 | |
| 622 | spin_unlock(&dlm->spinlock); |
| 623 | dlm_send_one_domain_exit(dlm, DLM_BEGIN_EXIT_DOMAIN_MSG, node); |
| 624 | spin_lock(&dlm->spinlock); |
| 625 | } |
| 626 | spin_unlock(&dlm->spinlock); |
| 627 | } |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 628 | |
| 629 | static void dlm_leave_domain(struct dlm_ctxt *dlm) |
| 630 | { |
| 631 | int node, clear_node, status; |
| 632 | |
| 633 | /* At this point we've migrated away all our locks and won't |
| 634 | * accept mastership of new ones. The dlm is responsible for |
| 635 | * almost nothing now. We make sure not to confuse any joining |
| 636 | * nodes and then commence shutdown procedure. */ |
| 637 | |
| 638 | spin_lock(&dlm->spinlock); |
| 639 | /* Clear ourselves from the domain map */ |
| 640 | clear_bit(dlm->node_num, dlm->domain_map); |
| 641 | while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, |
| 642 | 0)) < O2NM_MAX_NODES) { |
| 643 | /* Drop the dlm spinlock. This is safe wrt the domain_map. |
| 644 | * -nodes cannot be added now as the |
| 645 | * query_join_handlers knows to respond with OK_NO_MAP |
| 646 | * -we catch the right network errors if a node is |
| 647 | * removed from the map while we're sending him the |
| 648 | * exit message. */ |
| 649 | spin_unlock(&dlm->spinlock); |
| 650 | |
| 651 | clear_node = 1; |
| 652 | |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 653 | status = dlm_send_one_domain_exit(dlm, DLM_EXIT_DOMAIN_MSG, |
| 654 | node); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 655 | if (status < 0 && |
| 656 | status != -ENOPROTOOPT && |
| 657 | status != -ENOTCONN) { |
| 658 | mlog(ML_NOTICE, "Error %d sending domain exit message " |
| 659 | "to node %d\n", status, node); |
| 660 | |
| 661 | /* Not sure what to do here but lets sleep for |
| 662 | * a bit in case this was a transient |
| 663 | * error... */ |
| 664 | msleep(DLM_DOMAIN_BACKOFF_MS); |
| 665 | clear_node = 0; |
| 666 | } |
| 667 | |
| 668 | spin_lock(&dlm->spinlock); |
| 669 | /* If we're not clearing the node bit then we intend |
| 670 | * to loop back around to try again. */ |
| 671 | if (clear_node) |
| 672 | clear_bit(node, dlm->domain_map); |
| 673 | } |
| 674 | spin_unlock(&dlm->spinlock); |
| 675 | } |
| 676 | |
| 677 | int dlm_joined(struct dlm_ctxt *dlm) |
| 678 | { |
| 679 | int ret = 0; |
| 680 | |
| 681 | spin_lock(&dlm_domain_lock); |
| 682 | |
| 683 | if (dlm->dlm_state == DLM_CTXT_JOINED) |
| 684 | ret = 1; |
| 685 | |
| 686 | spin_unlock(&dlm_domain_lock); |
| 687 | |
| 688 | return ret; |
| 689 | } |
| 690 | |
| 691 | int dlm_shutting_down(struct dlm_ctxt *dlm) |
| 692 | { |
| 693 | int ret = 0; |
| 694 | |
| 695 | spin_lock(&dlm_domain_lock); |
| 696 | |
| 697 | if (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN) |
| 698 | ret = 1; |
| 699 | |
| 700 | spin_unlock(&dlm_domain_lock); |
| 701 | |
| 702 | return ret; |
| 703 | } |
| 704 | |
| 705 | void dlm_unregister_domain(struct dlm_ctxt *dlm) |
| 706 | { |
| 707 | int leave = 0; |
Sunil Mushran | 29576f8 | 2008-03-10 15:16:21 -0700 | [diff] [blame] | 708 | struct dlm_lock_resource *res; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 709 | |
| 710 | spin_lock(&dlm_domain_lock); |
| 711 | BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED); |
| 712 | BUG_ON(!dlm->num_joins); |
| 713 | |
| 714 | dlm->num_joins--; |
| 715 | if (!dlm->num_joins) { |
| 716 | /* We mark it "in shutdown" now so new register |
| 717 | * requests wait until we've completely left the |
| 718 | * domain. Don't use DLM_CTXT_LEAVING yet as we still |
| 719 | * want new domain joins to communicate with us at |
| 720 | * least until we've completed migration of our |
| 721 | * resources. */ |
| 722 | dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN; |
| 723 | leave = 1; |
| 724 | } |
| 725 | spin_unlock(&dlm_domain_lock); |
| 726 | |
| 727 | if (leave) { |
| 728 | mlog(0, "shutting down domain %s\n", dlm->name); |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 729 | dlm_begin_exit_domain(dlm); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 730 | |
| 731 | /* We changed dlm state, notify the thread */ |
| 732 | dlm_kick_thread(dlm, NULL); |
| 733 | |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 734 | while (dlm_migrate_all_locks(dlm)) { |
Sunil Mushran | 2f5bf1f | 2007-03-22 17:08:32 -0700 | [diff] [blame] | 735 | /* Give dlm_thread time to purge the lockres' */ |
| 736 | msleep(500); |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 737 | mlog(0, "%s: more migration to do\n", dlm->name); |
| 738 | } |
Sunil Mushran | 29576f8 | 2008-03-10 15:16:21 -0700 | [diff] [blame] | 739 | |
| 740 | /* This list should be empty. If not, print remaining lockres */ |
| 741 | if (!list_empty(&dlm->tracking_list)) { |
| 742 | mlog(ML_ERROR, "Following lockres' are still on the " |
| 743 | "tracking list:\n"); |
| 744 | list_for_each_entry(res, &dlm->tracking_list, tracking) |
| 745 | dlm_print_one_lock_resource(res); |
| 746 | } |
| 747 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 748 | dlm_mark_domain_leaving(dlm); |
| 749 | dlm_leave_domain(dlm); |
Sunil Mushran | 8decab3 | 2011-07-24 10:23:54 -0700 | [diff] [blame] | 750 | printk(KERN_NOTICE "o2dlm: Leaving domain %s\n", dlm->name); |
Srinivas Eeda | 5dad6c3 | 2010-09-21 16:27:26 -0700 | [diff] [blame] | 751 | dlm_force_free_mles(dlm); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 752 | dlm_complete_dlm_shutdown(dlm); |
| 753 | } |
| 754 | dlm_put(dlm); |
| 755 | } |
| 756 | EXPORT_SYMBOL_GPL(dlm_unregister_domain); |
| 757 | |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 758 | static int dlm_query_join_proto_check(char *proto_type, int node, |
| 759 | struct dlm_protocol_version *ours, |
| 760 | struct dlm_protocol_version *request) |
| 761 | { |
| 762 | int rc; |
| 763 | struct dlm_protocol_version proto = *request; |
| 764 | |
| 765 | if (!dlm_protocol_compare(ours, &proto)) { |
| 766 | mlog(0, |
| 767 | "node %u wanted to join with %s locking protocol " |
| 768 | "%u.%u, we respond with %u.%u\n", |
| 769 | node, proto_type, |
| 770 | request->pv_major, |
| 771 | request->pv_minor, |
| 772 | proto.pv_major, proto.pv_minor); |
| 773 | request->pv_minor = proto.pv_minor; |
| 774 | rc = 0; |
| 775 | } else { |
| 776 | mlog(ML_NOTICE, |
| 777 | "Node %u wanted to join with %s locking " |
| 778 | "protocol %u.%u, but we have %u.%u, disallowing\n", |
| 779 | node, proto_type, |
| 780 | request->pv_major, |
| 781 | request->pv_minor, |
| 782 | ours->pv_major, |
| 783 | ours->pv_minor); |
| 784 | rc = 1; |
| 785 | } |
| 786 | |
| 787 | return rc; |
| 788 | } |
| 789 | |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 790 | /* |
| 791 | * struct dlm_query_join_packet is made up of four one-byte fields. They |
| 792 | * are effectively in big-endian order already. However, little-endian |
| 793 | * machines swap them before putting the packet on the wire (because |
| 794 | * query_join's response is a status, and that status is treated as a u32 |
| 795 | * on the wire). Thus, a big-endian and little-endian machines will treat |
| 796 | * this structure differently. |
| 797 | * |
| 798 | * The solution is to have little-endian machines swap the structure when |
| 799 | * converting from the structure to the u32 representation. This will |
| 800 | * result in the structure having the correct format on the wire no matter |
| 801 | * the host endian format. |
| 802 | */ |
| 803 | static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet *packet, |
| 804 | u32 *wire) |
| 805 | { |
| 806 | union dlm_query_join_response response; |
| 807 | |
| 808 | response.packet = *packet; |
Al Viro | 8515841 | 2012-04-12 18:47:13 -0400 | [diff] [blame] | 809 | *wire = be32_to_cpu(response.intval); |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 810 | } |
| 811 | |
| 812 | static void dlm_query_join_wire_to_packet(u32 wire, |
| 813 | struct dlm_query_join_packet *packet) |
| 814 | { |
| 815 | union dlm_query_join_response response; |
| 816 | |
| 817 | response.intval = cpu_to_be32(wire); |
| 818 | *packet = response.packet; |
| 819 | } |
| 820 | |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 821 | static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data, |
| 822 | void **ret_data) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 823 | { |
| 824 | struct dlm_query_join_request *query; |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 825 | struct dlm_query_join_packet packet = { |
| 826 | .code = JOIN_DISALLOW, |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 827 | }; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 828 | struct dlm_ctxt *dlm = NULL; |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 829 | u32 response; |
Srinivas Eeda | 1faf289 | 2007-01-29 15:31:35 -0800 | [diff] [blame] | 830 | u8 nodenum; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 831 | |
| 832 | query = (struct dlm_query_join_request *) msg->buf; |
| 833 | |
| 834 | mlog(0, "node %u wants to join domain %s\n", query->node_idx, |
| 835 | query->domain); |
| 836 | |
| 837 | /* |
| 838 | * If heartbeat doesn't consider the node live, tell it |
| 839 | * to back off and try again. This gives heartbeat a chance |
| 840 | * to catch up. |
| 841 | */ |
| 842 | if (!o2hb_check_node_heartbeating(query->node_idx)) { |
| 843 | mlog(0, "node %u is not in our live map yet\n", |
| 844 | query->node_idx); |
| 845 | |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 846 | packet.code = JOIN_DISALLOW; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 847 | goto respond; |
| 848 | } |
| 849 | |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 850 | packet.code = JOIN_OK_NO_MAP; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 851 | |
| 852 | spin_lock(&dlm_domain_lock); |
| 853 | dlm = __dlm_lookup_domain_full(query->domain, query->name_len); |
Srinivas Eeda | 1faf289 | 2007-01-29 15:31:35 -0800 | [diff] [blame] | 854 | if (!dlm) |
| 855 | goto unlock_respond; |
| 856 | |
| 857 | /* |
| 858 | * There is a small window where the joining node may not see the |
| 859 | * node(s) that just left but still part of the cluster. DISALLOW |
| 860 | * join request if joining node has different node map. |
| 861 | */ |
| 862 | nodenum=0; |
| 863 | while (nodenum < O2NM_MAX_NODES) { |
| 864 | if (test_bit(nodenum, dlm->domain_map)) { |
| 865 | if (!byte_test_bit(nodenum, query->node_map)) { |
Sunil Mushran | e496847 | 2007-01-29 15:37:02 -0800 | [diff] [blame] | 866 | mlog(0, "disallow join as node %u does not " |
| 867 | "have node %u in its nodemap\n", |
| 868 | query->node_idx, nodenum); |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 869 | packet.code = JOIN_DISALLOW; |
Srinivas Eeda | 1faf289 | 2007-01-29 15:31:35 -0800 | [diff] [blame] | 870 | goto unlock_respond; |
| 871 | } |
| 872 | } |
| 873 | nodenum++; |
| 874 | } |
| 875 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 876 | /* Once the dlm ctxt is marked as leaving then we don't want |
Sunil Mushran | 2bd6321 | 2010-01-25 16:57:38 -0800 | [diff] [blame] | 877 | * to be put in someone's domain map. |
Kurt Hackel | e2faea4 | 2006-01-12 14:24:55 -0800 | [diff] [blame] | 878 | * Also, explicitly disallow joining at certain troublesome |
| 879 | * times (ie. during recovery). */ |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 880 | if (dlm && dlm->dlm_state != DLM_CTXT_LEAVING) { |
Kurt Hackel | e2faea4 | 2006-01-12 14:24:55 -0800 | [diff] [blame] | 881 | int bit = query->node_idx; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 882 | spin_lock(&dlm->spinlock); |
| 883 | |
| 884 | if (dlm->dlm_state == DLM_CTXT_NEW && |
| 885 | dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) { |
| 886 | /*If this is a brand new context and we |
| 887 | * haven't started our join process yet, then |
| 888 | * the other node won the race. */ |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 889 | packet.code = JOIN_OK_NO_MAP; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 890 | } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) { |
| 891 | /* Disallow parallel joins. */ |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 892 | packet.code = JOIN_DISALLOW; |
Kurt Hackel | e2faea4 | 2006-01-12 14:24:55 -0800 | [diff] [blame] | 893 | } else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) { |
Sunil Mushran | e496847 | 2007-01-29 15:37:02 -0800 | [diff] [blame] | 894 | mlog(0, "node %u trying to join, but recovery " |
Kurt Hackel | e2faea4 | 2006-01-12 14:24:55 -0800 | [diff] [blame] | 895 | "is ongoing.\n", bit); |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 896 | packet.code = JOIN_DISALLOW; |
Kurt Hackel | e2faea4 | 2006-01-12 14:24:55 -0800 | [diff] [blame] | 897 | } else if (test_bit(bit, dlm->recovery_map)) { |
Sunil Mushran | e496847 | 2007-01-29 15:37:02 -0800 | [diff] [blame] | 898 | mlog(0, "node %u trying to join, but it " |
Kurt Hackel | e2faea4 | 2006-01-12 14:24:55 -0800 | [diff] [blame] | 899 | "still needs recovery.\n", bit); |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 900 | packet.code = JOIN_DISALLOW; |
Kurt Hackel | e2faea4 | 2006-01-12 14:24:55 -0800 | [diff] [blame] | 901 | } else if (test_bit(bit, dlm->domain_map)) { |
Sunil Mushran | e496847 | 2007-01-29 15:37:02 -0800 | [diff] [blame] | 902 | mlog(0, "node %u trying to join, but it " |
Kurt Hackel | e2faea4 | 2006-01-12 14:24:55 -0800 | [diff] [blame] | 903 | "is still in the domain! needs recovery?\n", |
| 904 | bit); |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 905 | packet.code = JOIN_DISALLOW; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 906 | } else { |
| 907 | /* Alright we're fully a part of this domain |
| 908 | * so we keep some state as to who's joining |
| 909 | * and indicate to him that needs to be fixed |
| 910 | * up. */ |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 911 | |
| 912 | /* Make sure we speak compatible locking protocols. */ |
| 913 | if (dlm_query_join_proto_check("DLM", bit, |
| 914 | &dlm->dlm_locking_proto, |
| 915 | &query->dlm_proto)) { |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 916 | packet.code = JOIN_PROTOCOL_MISMATCH; |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 917 | } else if (dlm_query_join_proto_check("fs", bit, |
| 918 | &dlm->fs_locking_proto, |
| 919 | &query->fs_proto)) { |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 920 | packet.code = JOIN_PROTOCOL_MISMATCH; |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 921 | } else { |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 922 | packet.dlm_minor = query->dlm_proto.pv_minor; |
| 923 | packet.fs_minor = query->fs_proto.pv_minor; |
| 924 | packet.code = JOIN_OK; |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 925 | __dlm_set_joining_node(dlm, query->node_idx); |
| 926 | } |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 927 | } |
| 928 | |
| 929 | spin_unlock(&dlm->spinlock); |
| 930 | } |
Srinivas Eeda | 1faf289 | 2007-01-29 15:31:35 -0800 | [diff] [blame] | 931 | unlock_respond: |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 932 | spin_unlock(&dlm_domain_lock); |
| 933 | |
| 934 | respond: |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 935 | mlog(0, "We respond with %u\n", packet.code); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 936 | |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 937 | dlm_query_join_packet_to_wire(&packet, &response); |
| 938 | return response; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 939 | } |
| 940 | |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 941 | static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data, |
| 942 | void **ret_data) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 943 | { |
| 944 | struct dlm_assert_joined *assert; |
| 945 | struct dlm_ctxt *dlm = NULL; |
| 946 | |
| 947 | assert = (struct dlm_assert_joined *) msg->buf; |
| 948 | |
| 949 | mlog(0, "node %u asserts join on domain %s\n", assert->node_idx, |
| 950 | assert->domain); |
| 951 | |
| 952 | spin_lock(&dlm_domain_lock); |
| 953 | dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len); |
| 954 | /* XXX should we consider no dlm ctxt an error? */ |
| 955 | if (dlm) { |
| 956 | spin_lock(&dlm->spinlock); |
| 957 | |
| 958 | /* Alright, this node has officially joined our |
| 959 | * domain. Set him in the map and clean up our |
| 960 | * leftover join state. */ |
| 961 | BUG_ON(dlm->joining_node != assert->node_idx); |
| 962 | set_bit(assert->node_idx, dlm->domain_map); |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 963 | clear_bit(assert->node_idx, dlm->exit_domain_map); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 964 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); |
| 965 | |
Sunil Mushran | 8decab3 | 2011-07-24 10:23:54 -0700 | [diff] [blame] | 966 | printk(KERN_NOTICE "o2dlm: Node %u joins domain %s ", |
Sunil Mushran | 781ee3e | 2006-04-27 16:41:31 -0700 | [diff] [blame] | 967 | assert->node_idx, dlm->name); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 968 | __dlm_print_nodes(dlm); |
| 969 | |
| 970 | /* notify anything attached to the heartbeat events */ |
| 971 | dlm_hb_event_notify_attached(dlm, assert->node_idx, 1); |
| 972 | |
| 973 | spin_unlock(&dlm->spinlock); |
| 974 | } |
| 975 | spin_unlock(&dlm_domain_lock); |
| 976 | |
| 977 | return 0; |
| 978 | } |
| 979 | |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 980 | static int dlm_match_regions(struct dlm_ctxt *dlm, |
Sunil Mushran | 770c4d8 | 2011-02-21 14:25:25 -0800 | [diff] [blame] | 981 | struct dlm_query_region *qr, |
| 982 | char *local, int locallen) |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 983 | { |
Sunil Mushran | 770c4d8 | 2011-02-21 14:25:25 -0800 | [diff] [blame] | 984 | char *remote = qr->qr_regions; |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 985 | char *l, *r; |
| 986 | int localnr, i, j, foundit; |
| 987 | int status = 0; |
| 988 | |
| 989 | if (!o2hb_global_heartbeat_active()) { |
| 990 | if (qr->qr_numregions) { |
| 991 | mlog(ML_ERROR, "Domain %s: Joining node %d has global " |
| 992 | "heartbeat enabled but local node %d does not\n", |
| 993 | qr->qr_domain, qr->qr_node, dlm->node_num); |
| 994 | status = -EINVAL; |
| 995 | } |
| 996 | goto bail; |
| 997 | } |
| 998 | |
| 999 | if (o2hb_global_heartbeat_active() && !qr->qr_numregions) { |
| 1000 | mlog(ML_ERROR, "Domain %s: Local node %d has global " |
| 1001 | "heartbeat enabled but joining node %d does not\n", |
| 1002 | qr->qr_domain, dlm->node_num, qr->qr_node); |
| 1003 | status = -EINVAL; |
| 1004 | goto bail; |
| 1005 | } |
| 1006 | |
| 1007 | r = remote; |
| 1008 | for (i = 0; i < qr->qr_numregions; ++i) { |
| 1009 | mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, r); |
| 1010 | r += O2HB_MAX_REGION_NAME_LEN; |
| 1011 | } |
| 1012 | |
Sunil Mushran | 770c4d8 | 2011-02-21 14:25:25 -0800 | [diff] [blame] | 1013 | localnr = min(O2NM_MAX_REGIONS, locallen/O2HB_MAX_REGION_NAME_LEN); |
| 1014 | localnr = o2hb_get_all_regions(local, (u8)localnr); |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 1015 | |
| 1016 | /* compare local regions with remote */ |
| 1017 | l = local; |
| 1018 | for (i = 0; i < localnr; ++i) { |
| 1019 | foundit = 0; |
| 1020 | r = remote; |
| 1021 | for (j = 0; j <= qr->qr_numregions; ++j) { |
| 1022 | if (!memcmp(l, r, O2HB_MAX_REGION_NAME_LEN)) { |
| 1023 | foundit = 1; |
| 1024 | break; |
| 1025 | } |
| 1026 | r += O2HB_MAX_REGION_NAME_LEN; |
| 1027 | } |
| 1028 | if (!foundit) { |
| 1029 | status = -EINVAL; |
| 1030 | mlog(ML_ERROR, "Domain %s: Region '%.*s' registered " |
| 1031 | "in local node %d but not in joining node %d\n", |
| 1032 | qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, l, |
| 1033 | dlm->node_num, qr->qr_node); |
| 1034 | goto bail; |
| 1035 | } |
| 1036 | l += O2HB_MAX_REGION_NAME_LEN; |
| 1037 | } |
| 1038 | |
| 1039 | /* compare remote with local regions */ |
| 1040 | r = remote; |
| 1041 | for (i = 0; i < qr->qr_numregions; ++i) { |
| 1042 | foundit = 0; |
| 1043 | l = local; |
| 1044 | for (j = 0; j < localnr; ++j) { |
| 1045 | if (!memcmp(r, l, O2HB_MAX_REGION_NAME_LEN)) { |
| 1046 | foundit = 1; |
| 1047 | break; |
| 1048 | } |
| 1049 | l += O2HB_MAX_REGION_NAME_LEN; |
| 1050 | } |
| 1051 | if (!foundit) { |
| 1052 | status = -EINVAL; |
| 1053 | mlog(ML_ERROR, "Domain %s: Region '%.*s' registered " |
| 1054 | "in joining node %d but not in local node %d\n", |
| 1055 | qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, r, |
| 1056 | qr->qr_node, dlm->node_num); |
| 1057 | goto bail; |
| 1058 | } |
| 1059 | r += O2HB_MAX_REGION_NAME_LEN; |
| 1060 | } |
| 1061 | |
| 1062 | bail: |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 1063 | return status; |
| 1064 | } |
| 1065 | |
| 1066 | static int dlm_send_regions(struct dlm_ctxt *dlm, unsigned long *node_map) |
| 1067 | { |
| 1068 | struct dlm_query_region *qr = NULL; |
| 1069 | int status, ret = 0, i; |
| 1070 | char *p; |
| 1071 | |
| 1072 | if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES) |
| 1073 | goto bail; |
| 1074 | |
| 1075 | qr = kzalloc(sizeof(struct dlm_query_region), GFP_KERNEL); |
| 1076 | if (!qr) { |
| 1077 | ret = -ENOMEM; |
| 1078 | mlog_errno(ret); |
| 1079 | goto bail; |
| 1080 | } |
| 1081 | |
| 1082 | qr->qr_node = dlm->node_num; |
| 1083 | qr->qr_namelen = strlen(dlm->name); |
| 1084 | memcpy(qr->qr_domain, dlm->name, qr->qr_namelen); |
| 1085 | /* if local hb, the numregions will be zero */ |
| 1086 | if (o2hb_global_heartbeat_active()) |
| 1087 | qr->qr_numregions = o2hb_get_all_regions(qr->qr_regions, |
| 1088 | O2NM_MAX_REGIONS); |
| 1089 | |
| 1090 | p = qr->qr_regions; |
| 1091 | for (i = 0; i < qr->qr_numregions; ++i, p += O2HB_MAX_REGION_NAME_LEN) |
| 1092 | mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, p); |
| 1093 | |
| 1094 | i = -1; |
| 1095 | while ((i = find_next_bit(node_map, O2NM_MAX_NODES, |
| 1096 | i + 1)) < O2NM_MAX_NODES) { |
| 1097 | if (i == dlm->node_num) |
| 1098 | continue; |
| 1099 | |
| 1100 | mlog(0, "Sending regions to node %d\n", i); |
| 1101 | |
| 1102 | ret = o2net_send_message(DLM_QUERY_REGION, DLM_MOD_KEY, qr, |
| 1103 | sizeof(struct dlm_query_region), |
| 1104 | i, &status); |
| 1105 | if (ret >= 0) |
| 1106 | ret = status; |
| 1107 | if (ret) { |
| 1108 | mlog(ML_ERROR, "Region mismatch %d, node %d\n", |
| 1109 | ret, i); |
| 1110 | break; |
| 1111 | } |
| 1112 | } |
| 1113 | |
| 1114 | bail: |
| 1115 | kfree(qr); |
| 1116 | return ret; |
| 1117 | } |
| 1118 | |
| 1119 | static int dlm_query_region_handler(struct o2net_msg *msg, u32 len, |
| 1120 | void *data, void **ret_data) |
| 1121 | { |
| 1122 | struct dlm_query_region *qr; |
| 1123 | struct dlm_ctxt *dlm = NULL; |
Sunil Mushran | 770c4d8 | 2011-02-21 14:25:25 -0800 | [diff] [blame] | 1124 | char *local = NULL; |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 1125 | int status = 0; |
| 1126 | int locked = 0; |
| 1127 | |
| 1128 | qr = (struct dlm_query_region *) msg->buf; |
| 1129 | |
| 1130 | mlog(0, "Node %u queries hb regions on domain %s\n", qr->qr_node, |
| 1131 | qr->qr_domain); |
| 1132 | |
Sunil Mushran | 770c4d8 | 2011-02-21 14:25:25 -0800 | [diff] [blame] | 1133 | /* buffer used in dlm_mast_regions() */ |
| 1134 | local = kmalloc(sizeof(qr->qr_regions), GFP_KERNEL); |
| 1135 | if (!local) { |
| 1136 | status = -ENOMEM; |
| 1137 | goto bail; |
| 1138 | } |
| 1139 | |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 1140 | status = -EINVAL; |
| 1141 | |
| 1142 | spin_lock(&dlm_domain_lock); |
| 1143 | dlm = __dlm_lookup_domain_full(qr->qr_domain, qr->qr_namelen); |
| 1144 | if (!dlm) { |
| 1145 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " |
| 1146 | "before join domain\n", qr->qr_node, qr->qr_domain); |
| 1147 | goto bail; |
| 1148 | } |
| 1149 | |
| 1150 | spin_lock(&dlm->spinlock); |
| 1151 | locked = 1; |
| 1152 | if (dlm->joining_node != qr->qr_node) { |
| 1153 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " |
| 1154 | "but joining node is %d\n", qr->qr_node, qr->qr_domain, |
| 1155 | dlm->joining_node); |
| 1156 | goto bail; |
| 1157 | } |
| 1158 | |
| 1159 | /* Support for global heartbeat was added in 1.1 */ |
| 1160 | if (dlm->dlm_locking_proto.pv_major == 1 && |
| 1161 | dlm->dlm_locking_proto.pv_minor == 0) { |
| 1162 | mlog(ML_ERROR, "Node %d queried hb regions on domain %s " |
| 1163 | "but active dlm protocol is %d.%d\n", qr->qr_node, |
| 1164 | qr->qr_domain, dlm->dlm_locking_proto.pv_major, |
| 1165 | dlm->dlm_locking_proto.pv_minor); |
| 1166 | goto bail; |
| 1167 | } |
| 1168 | |
Sunil Mushran | 770c4d8 | 2011-02-21 14:25:25 -0800 | [diff] [blame] | 1169 | status = dlm_match_regions(dlm, qr, local, sizeof(qr->qr_regions)); |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 1170 | |
| 1171 | bail: |
| 1172 | if (locked) |
| 1173 | spin_unlock(&dlm->spinlock); |
| 1174 | spin_unlock(&dlm_domain_lock); |
| 1175 | |
Sunil Mushran | 770c4d8 | 2011-02-21 14:25:25 -0800 | [diff] [blame] | 1176 | kfree(local); |
| 1177 | |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 1178 | return status; |
| 1179 | } |
| 1180 | |
Sunil Mushran | 18cfdf1 | 2010-10-07 16:47:03 -0700 | [diff] [blame] | 1181 | static int dlm_match_nodes(struct dlm_ctxt *dlm, struct dlm_query_nodeinfo *qn) |
| 1182 | { |
| 1183 | struct o2nm_node *local; |
| 1184 | struct dlm_node_info *remote; |
| 1185 | int i, j; |
| 1186 | int status = 0; |
| 1187 | |
| 1188 | for (j = 0; j < qn->qn_numnodes; ++j) |
| 1189 | mlog(0, "Node %3d, %pI4:%u\n", qn->qn_nodes[j].ni_nodenum, |
| 1190 | &(qn->qn_nodes[j].ni_ipv4_address), |
| 1191 | ntohs(qn->qn_nodes[j].ni_ipv4_port)); |
| 1192 | |
| 1193 | for (i = 0; i < O2NM_MAX_NODES && !status; ++i) { |
| 1194 | local = o2nm_get_node_by_num(i); |
| 1195 | remote = NULL; |
| 1196 | for (j = 0; j < qn->qn_numnodes; ++j) { |
| 1197 | if (qn->qn_nodes[j].ni_nodenum == i) { |
| 1198 | remote = &(qn->qn_nodes[j]); |
| 1199 | break; |
| 1200 | } |
| 1201 | } |
| 1202 | |
| 1203 | if (!local && !remote) |
| 1204 | continue; |
| 1205 | |
| 1206 | if ((local && !remote) || (!local && remote)) |
| 1207 | status = -EINVAL; |
| 1208 | |
| 1209 | if (!status && |
| 1210 | ((remote->ni_nodenum != local->nd_num) || |
| 1211 | (remote->ni_ipv4_port != local->nd_ipv4_port) || |
| 1212 | (remote->ni_ipv4_address != local->nd_ipv4_address))) |
| 1213 | status = -EINVAL; |
| 1214 | |
| 1215 | if (status) { |
| 1216 | if (remote && !local) |
| 1217 | mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) " |
| 1218 | "registered in joining node %d but not in " |
| 1219 | "local node %d\n", qn->qn_domain, |
| 1220 | remote->ni_nodenum, |
| 1221 | &(remote->ni_ipv4_address), |
| 1222 | ntohs(remote->ni_ipv4_port), |
| 1223 | qn->qn_nodenum, dlm->node_num); |
| 1224 | if (local && !remote) |
| 1225 | mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) " |
| 1226 | "registered in local node %d but not in " |
| 1227 | "joining node %d\n", qn->qn_domain, |
| 1228 | local->nd_num, &(local->nd_ipv4_address), |
| 1229 | ntohs(local->nd_ipv4_port), |
| 1230 | dlm->node_num, qn->qn_nodenum); |
| 1231 | BUG_ON((!local && !remote)); |
| 1232 | } |
| 1233 | |
| 1234 | if (local) |
| 1235 | o2nm_node_put(local); |
| 1236 | } |
| 1237 | |
| 1238 | return status; |
| 1239 | } |
| 1240 | |
| 1241 | static int dlm_send_nodeinfo(struct dlm_ctxt *dlm, unsigned long *node_map) |
| 1242 | { |
| 1243 | struct dlm_query_nodeinfo *qn = NULL; |
| 1244 | struct o2nm_node *node; |
| 1245 | int ret = 0, status, count, i; |
| 1246 | |
| 1247 | if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES) |
| 1248 | goto bail; |
| 1249 | |
| 1250 | qn = kzalloc(sizeof(struct dlm_query_nodeinfo), GFP_KERNEL); |
| 1251 | if (!qn) { |
| 1252 | ret = -ENOMEM; |
| 1253 | mlog_errno(ret); |
| 1254 | goto bail; |
| 1255 | } |
| 1256 | |
| 1257 | for (i = 0, count = 0; i < O2NM_MAX_NODES; ++i) { |
| 1258 | node = o2nm_get_node_by_num(i); |
| 1259 | if (!node) |
| 1260 | continue; |
| 1261 | qn->qn_nodes[count].ni_nodenum = node->nd_num; |
| 1262 | qn->qn_nodes[count].ni_ipv4_port = node->nd_ipv4_port; |
| 1263 | qn->qn_nodes[count].ni_ipv4_address = node->nd_ipv4_address; |
| 1264 | mlog(0, "Node %3d, %pI4:%u\n", node->nd_num, |
| 1265 | &(node->nd_ipv4_address), ntohs(node->nd_ipv4_port)); |
| 1266 | ++count; |
| 1267 | o2nm_node_put(node); |
| 1268 | } |
| 1269 | |
| 1270 | qn->qn_nodenum = dlm->node_num; |
| 1271 | qn->qn_numnodes = count; |
| 1272 | qn->qn_namelen = strlen(dlm->name); |
| 1273 | memcpy(qn->qn_domain, dlm->name, qn->qn_namelen); |
| 1274 | |
| 1275 | i = -1; |
| 1276 | while ((i = find_next_bit(node_map, O2NM_MAX_NODES, |
| 1277 | i + 1)) < O2NM_MAX_NODES) { |
| 1278 | if (i == dlm->node_num) |
| 1279 | continue; |
| 1280 | |
| 1281 | mlog(0, "Sending nodeinfo to node %d\n", i); |
| 1282 | |
| 1283 | ret = o2net_send_message(DLM_QUERY_NODEINFO, DLM_MOD_KEY, |
| 1284 | qn, sizeof(struct dlm_query_nodeinfo), |
| 1285 | i, &status); |
| 1286 | if (ret >= 0) |
| 1287 | ret = status; |
| 1288 | if (ret) { |
| 1289 | mlog(ML_ERROR, "node mismatch %d, node %d\n", ret, i); |
| 1290 | break; |
| 1291 | } |
| 1292 | } |
| 1293 | |
| 1294 | bail: |
| 1295 | kfree(qn); |
| 1296 | return ret; |
| 1297 | } |
| 1298 | |
| 1299 | static int dlm_query_nodeinfo_handler(struct o2net_msg *msg, u32 len, |
| 1300 | void *data, void **ret_data) |
| 1301 | { |
| 1302 | struct dlm_query_nodeinfo *qn; |
| 1303 | struct dlm_ctxt *dlm = NULL; |
| 1304 | int locked = 0, status = -EINVAL; |
| 1305 | |
| 1306 | qn = (struct dlm_query_nodeinfo *) msg->buf; |
| 1307 | |
| 1308 | mlog(0, "Node %u queries nodes on domain %s\n", qn->qn_nodenum, |
| 1309 | qn->qn_domain); |
| 1310 | |
| 1311 | spin_lock(&dlm_domain_lock); |
| 1312 | dlm = __dlm_lookup_domain_full(qn->qn_domain, qn->qn_namelen); |
| 1313 | if (!dlm) { |
| 1314 | mlog(ML_ERROR, "Node %d queried nodes on domain %s before " |
| 1315 | "join domain\n", qn->qn_nodenum, qn->qn_domain); |
| 1316 | goto bail; |
| 1317 | } |
| 1318 | |
| 1319 | spin_lock(&dlm->spinlock); |
| 1320 | locked = 1; |
| 1321 | if (dlm->joining_node != qn->qn_nodenum) { |
| 1322 | mlog(ML_ERROR, "Node %d queried nodes on domain %s but " |
| 1323 | "joining node is %d\n", qn->qn_nodenum, qn->qn_domain, |
| 1324 | dlm->joining_node); |
| 1325 | goto bail; |
| 1326 | } |
| 1327 | |
| 1328 | /* Support for node query was added in 1.1 */ |
| 1329 | if (dlm->dlm_locking_proto.pv_major == 1 && |
| 1330 | dlm->dlm_locking_proto.pv_minor == 0) { |
| 1331 | mlog(ML_ERROR, "Node %d queried nodes on domain %s " |
| 1332 | "but active dlm protocol is %d.%d\n", qn->qn_nodenum, |
| 1333 | qn->qn_domain, dlm->dlm_locking_proto.pv_major, |
| 1334 | dlm->dlm_locking_proto.pv_minor); |
| 1335 | goto bail; |
| 1336 | } |
| 1337 | |
| 1338 | status = dlm_match_nodes(dlm, qn); |
| 1339 | |
| 1340 | bail: |
| 1341 | if (locked) |
| 1342 | spin_unlock(&dlm->spinlock); |
| 1343 | spin_unlock(&dlm_domain_lock); |
| 1344 | |
| 1345 | return status; |
| 1346 | } |
| 1347 | |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1348 | static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data, |
| 1349 | void **ret_data) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1350 | { |
| 1351 | struct dlm_cancel_join *cancel; |
| 1352 | struct dlm_ctxt *dlm = NULL; |
| 1353 | |
| 1354 | cancel = (struct dlm_cancel_join *) msg->buf; |
| 1355 | |
| 1356 | mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx, |
| 1357 | cancel->domain); |
| 1358 | |
| 1359 | spin_lock(&dlm_domain_lock); |
| 1360 | dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len); |
| 1361 | |
| 1362 | if (dlm) { |
| 1363 | spin_lock(&dlm->spinlock); |
| 1364 | |
| 1365 | /* Yikes, this guy wants to cancel his join. No |
| 1366 | * problem, we simply cleanup our join state. */ |
| 1367 | BUG_ON(dlm->joining_node != cancel->node_idx); |
| 1368 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); |
| 1369 | |
| 1370 | spin_unlock(&dlm->spinlock); |
| 1371 | } |
| 1372 | spin_unlock(&dlm_domain_lock); |
| 1373 | |
| 1374 | return 0; |
| 1375 | } |
| 1376 | |
| 1377 | static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm, |
| 1378 | unsigned int node) |
| 1379 | { |
| 1380 | int status; |
| 1381 | struct dlm_cancel_join cancel_msg; |
| 1382 | |
| 1383 | memset(&cancel_msg, 0, sizeof(cancel_msg)); |
| 1384 | cancel_msg.node_idx = dlm->node_num; |
| 1385 | cancel_msg.name_len = strlen(dlm->name); |
| 1386 | memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len); |
| 1387 | |
| 1388 | status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, |
| 1389 | &cancel_msg, sizeof(cancel_msg), node, |
| 1390 | NULL); |
| 1391 | if (status < 0) { |
Wengang Wang | a5196ec | 2010-03-30 12:09:22 +0800 | [diff] [blame] | 1392 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
| 1393 | "node %u\n", status, DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, |
| 1394 | node); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1395 | goto bail; |
| 1396 | } |
| 1397 | |
| 1398 | bail: |
| 1399 | return status; |
| 1400 | } |
| 1401 | |
| 1402 | /* map_size should be in bytes. */ |
| 1403 | static int dlm_send_join_cancels(struct dlm_ctxt *dlm, |
| 1404 | unsigned long *node_map, |
| 1405 | unsigned int map_size) |
| 1406 | { |
| 1407 | int status, tmpstat; |
| 1408 | unsigned int node; |
| 1409 | |
| 1410 | if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) * |
| 1411 | sizeof(unsigned long))) { |
| 1412 | mlog(ML_ERROR, |
| 1413 | "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n", |
Andrew Morton | 3a4780a | 2008-02-29 01:56:06 -0800 | [diff] [blame] | 1414 | map_size, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES)); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1415 | return -EINVAL; |
| 1416 | } |
| 1417 | |
| 1418 | status = 0; |
| 1419 | node = -1; |
| 1420 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, |
| 1421 | node + 1)) < O2NM_MAX_NODES) { |
| 1422 | if (node == dlm->node_num) |
| 1423 | continue; |
| 1424 | |
| 1425 | tmpstat = dlm_send_one_join_cancel(dlm, node); |
| 1426 | if (tmpstat) { |
| 1427 | mlog(ML_ERROR, "Error return %d cancelling join on " |
| 1428 | "node %d\n", tmpstat, node); |
| 1429 | if (!status) |
| 1430 | status = tmpstat; |
| 1431 | } |
| 1432 | } |
| 1433 | |
| 1434 | if (status) |
| 1435 | mlog_errno(status); |
| 1436 | return status; |
| 1437 | } |
| 1438 | |
| 1439 | static int dlm_request_join(struct dlm_ctxt *dlm, |
| 1440 | int node, |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 1441 | enum dlm_query_join_response_code *response) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1442 | { |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 1443 | int status; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1444 | struct dlm_query_join_request join_msg; |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 1445 | struct dlm_query_join_packet packet; |
| 1446 | u32 join_resp; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1447 | |
| 1448 | mlog(0, "querying node %d\n", node); |
| 1449 | |
| 1450 | memset(&join_msg, 0, sizeof(join_msg)); |
| 1451 | join_msg.node_idx = dlm->node_num; |
| 1452 | join_msg.name_len = strlen(dlm->name); |
| 1453 | memcpy(join_msg.domain, dlm->name, join_msg.name_len); |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 1454 | join_msg.dlm_proto = dlm->dlm_locking_proto; |
| 1455 | join_msg.fs_proto = dlm->fs_locking_proto; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1456 | |
Srinivas Eeda | 1faf289 | 2007-01-29 15:31:35 -0800 | [diff] [blame] | 1457 | /* copy live node map to join message */ |
| 1458 | byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES); |
| 1459 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1460 | status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg, |
Wengang Wang | a5196ec | 2010-03-30 12:09:22 +0800 | [diff] [blame] | 1461 | sizeof(join_msg), node, &join_resp); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1462 | if (status < 0 && status != -ENOPROTOOPT) { |
Wengang Wang | a5196ec | 2010-03-30 12:09:22 +0800 | [diff] [blame] | 1463 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
| 1464 | "node %u\n", status, DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, |
| 1465 | node); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1466 | goto bail; |
| 1467 | } |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 1468 | dlm_query_join_wire_to_packet(join_resp, &packet); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1469 | |
| 1470 | /* -ENOPROTOOPT from the net code means the other side isn't |
| 1471 | listening for our message type -- that's fine, it means |
| 1472 | his dlm isn't up, so we can consider him a 'yes' but not |
| 1473 | joined into the domain. */ |
| 1474 | if (status == -ENOPROTOOPT) { |
| 1475 | status = 0; |
| 1476 | *response = JOIN_OK_NO_MAP; |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 1477 | } else if (packet.code == JOIN_DISALLOW || |
| 1478 | packet.code == JOIN_OK_NO_MAP) { |
| 1479 | *response = packet.code; |
| 1480 | } else if (packet.code == JOIN_PROTOCOL_MISMATCH) { |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 1481 | mlog(ML_NOTICE, |
| 1482 | "This node requested DLM locking protocol %u.%u and " |
| 1483 | "filesystem locking protocol %u.%u. At least one of " |
| 1484 | "the protocol versions on node %d is not compatible, " |
| 1485 | "disconnecting\n", |
| 1486 | dlm->dlm_locking_proto.pv_major, |
| 1487 | dlm->dlm_locking_proto.pv_minor, |
| 1488 | dlm->fs_locking_proto.pv_major, |
| 1489 | dlm->fs_locking_proto.pv_minor, |
| 1490 | node); |
| 1491 | status = -EPROTO; |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 1492 | *response = packet.code; |
| 1493 | } else if (packet.code == JOIN_OK) { |
| 1494 | *response = packet.code; |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 1495 | /* Use the same locking protocol as the remote node */ |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 1496 | dlm->dlm_locking_proto.pv_minor = packet.dlm_minor; |
| 1497 | dlm->fs_locking_proto.pv_minor = packet.fs_minor; |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 1498 | mlog(0, |
| 1499 | "Node %d responds JOIN_OK with DLM locking protocol " |
| 1500 | "%u.%u and fs locking protocol %u.%u\n", |
| 1501 | node, |
| 1502 | dlm->dlm_locking_proto.pv_major, |
| 1503 | dlm->dlm_locking_proto.pv_minor, |
| 1504 | dlm->fs_locking_proto.pv_major, |
| 1505 | dlm->fs_locking_proto.pv_minor); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1506 | } else { |
| 1507 | status = -EINVAL; |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 1508 | mlog(ML_ERROR, "invalid response %d from node %u\n", |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 1509 | packet.code, node); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1510 | } |
| 1511 | |
| 1512 | mlog(0, "status %d, node %d response is %d\n", status, node, |
Joel Becker | 0f71b7b | 2008-02-12 14:56:25 -0800 | [diff] [blame] | 1513 | *response); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1514 | |
| 1515 | bail: |
| 1516 | return status; |
| 1517 | } |
| 1518 | |
| 1519 | static int dlm_send_one_join_assert(struct dlm_ctxt *dlm, |
| 1520 | unsigned int node) |
| 1521 | { |
| 1522 | int status; |
| 1523 | struct dlm_assert_joined assert_msg; |
| 1524 | |
| 1525 | mlog(0, "Sending join assert to node %u\n", node); |
| 1526 | |
| 1527 | memset(&assert_msg, 0, sizeof(assert_msg)); |
| 1528 | assert_msg.node_idx = dlm->node_num; |
| 1529 | assert_msg.name_len = strlen(dlm->name); |
| 1530 | memcpy(assert_msg.domain, dlm->name, assert_msg.name_len); |
| 1531 | |
| 1532 | status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, |
| 1533 | &assert_msg, sizeof(assert_msg), node, |
| 1534 | NULL); |
| 1535 | if (status < 0) |
Wengang Wang | a5196ec | 2010-03-30 12:09:22 +0800 | [diff] [blame] | 1536 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
| 1537 | "node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, |
| 1538 | node); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1539 | |
| 1540 | return status; |
| 1541 | } |
| 1542 | |
| 1543 | static void dlm_send_join_asserts(struct dlm_ctxt *dlm, |
| 1544 | unsigned long *node_map) |
| 1545 | { |
| 1546 | int status, node, live; |
| 1547 | |
| 1548 | status = 0; |
| 1549 | node = -1; |
| 1550 | while ((node = find_next_bit(node_map, O2NM_MAX_NODES, |
| 1551 | node + 1)) < O2NM_MAX_NODES) { |
| 1552 | if (node == dlm->node_num) |
| 1553 | continue; |
| 1554 | |
| 1555 | do { |
| 1556 | /* It is very important that this message be |
| 1557 | * received so we spin until either the node |
| 1558 | * has died or it gets the message. */ |
| 1559 | status = dlm_send_one_join_assert(dlm, node); |
| 1560 | |
| 1561 | spin_lock(&dlm->spinlock); |
| 1562 | live = test_bit(node, dlm->live_nodes_map); |
| 1563 | spin_unlock(&dlm->spinlock); |
| 1564 | |
| 1565 | if (status) { |
| 1566 | mlog(ML_ERROR, "Error return %d asserting " |
| 1567 | "join on node %d\n", status, node); |
| 1568 | |
| 1569 | /* give us some time between errors... */ |
| 1570 | if (live) |
| 1571 | msleep(DLM_DOMAIN_BACKOFF_MS); |
| 1572 | } |
| 1573 | } while (status && live); |
| 1574 | } |
| 1575 | } |
| 1576 | |
| 1577 | struct domain_join_ctxt { |
| 1578 | unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
| 1579 | unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
| 1580 | }; |
| 1581 | |
| 1582 | static int dlm_should_restart_join(struct dlm_ctxt *dlm, |
| 1583 | struct domain_join_ctxt *ctxt, |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 1584 | enum dlm_query_join_response_code response) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1585 | { |
| 1586 | int ret; |
| 1587 | |
| 1588 | if (response == JOIN_DISALLOW) { |
| 1589 | mlog(0, "Latest response of disallow -- should restart\n"); |
| 1590 | return 1; |
| 1591 | } |
| 1592 | |
| 1593 | spin_lock(&dlm->spinlock); |
| 1594 | /* For now, we restart the process if the node maps have |
| 1595 | * changed at all */ |
| 1596 | ret = memcmp(ctxt->live_map, dlm->live_nodes_map, |
| 1597 | sizeof(dlm->live_nodes_map)); |
| 1598 | spin_unlock(&dlm->spinlock); |
| 1599 | |
| 1600 | if (ret) |
| 1601 | mlog(0, "Node maps changed -- should restart\n"); |
| 1602 | |
| 1603 | return ret; |
| 1604 | } |
| 1605 | |
| 1606 | static int dlm_try_to_join_domain(struct dlm_ctxt *dlm) |
| 1607 | { |
| 1608 | int status = 0, tmpstat, node; |
| 1609 | struct domain_join_ctxt *ctxt; |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 1610 | enum dlm_query_join_response_code response = JOIN_DISALLOW; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1611 | |
Tao Ma | ef6b689 | 2011-02-21 11:10:44 +0800 | [diff] [blame] | 1612 | mlog(0, "%p", dlm); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1613 | |
Robert P. J. Day | cd86128 | 2006-12-13 00:34:52 -0800 | [diff] [blame] | 1614 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1615 | if (!ctxt) { |
| 1616 | status = -ENOMEM; |
| 1617 | mlog_errno(status); |
| 1618 | goto bail; |
| 1619 | } |
| 1620 | |
| 1621 | /* group sem locking should work for us here -- we're already |
| 1622 | * registered for heartbeat events so filling this should be |
| 1623 | * atomic wrt getting those handlers called. */ |
| 1624 | o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map)); |
| 1625 | |
| 1626 | spin_lock(&dlm->spinlock); |
| 1627 | memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map)); |
| 1628 | |
| 1629 | __dlm_set_joining_node(dlm, dlm->node_num); |
| 1630 | |
| 1631 | spin_unlock(&dlm->spinlock); |
| 1632 | |
| 1633 | node = -1; |
| 1634 | while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES, |
| 1635 | node + 1)) < O2NM_MAX_NODES) { |
| 1636 | if (node == dlm->node_num) |
| 1637 | continue; |
| 1638 | |
| 1639 | status = dlm_request_join(dlm, node, &response); |
| 1640 | if (status < 0) { |
| 1641 | mlog_errno(status); |
| 1642 | goto bail; |
| 1643 | } |
| 1644 | |
| 1645 | /* Ok, either we got a response or the node doesn't have a |
| 1646 | * dlm up. */ |
| 1647 | if (response == JOIN_OK) |
| 1648 | set_bit(node, ctxt->yes_resp_map); |
| 1649 | |
| 1650 | if (dlm_should_restart_join(dlm, ctxt, response)) { |
| 1651 | status = -EAGAIN; |
| 1652 | goto bail; |
| 1653 | } |
| 1654 | } |
| 1655 | |
| 1656 | mlog(0, "Yay, done querying nodes!\n"); |
| 1657 | |
| 1658 | /* Yay, everyone agree's we can join the domain. My domain is |
| 1659 | * comprised of all nodes who were put in the |
| 1660 | * yes_resp_map. Copy that into our domain map and send a join |
| 1661 | * assert message to clean up everyone elses state. */ |
| 1662 | spin_lock(&dlm->spinlock); |
| 1663 | memcpy(dlm->domain_map, ctxt->yes_resp_map, |
| 1664 | sizeof(ctxt->yes_resp_map)); |
| 1665 | set_bit(dlm->node_num, dlm->domain_map); |
| 1666 | spin_unlock(&dlm->spinlock); |
| 1667 | |
Sunil Mushran | 18cfdf1 | 2010-10-07 16:47:03 -0700 | [diff] [blame] | 1668 | /* Support for global heartbeat and node info was added in 1.1 */ |
Sunil Mushran | 4da6dc2 | 2011-05-04 10:27:10 -0700 | [diff] [blame] | 1669 | if (dlm->dlm_locking_proto.pv_major > 1 || |
| 1670 | dlm->dlm_locking_proto.pv_minor > 0) { |
Sunil Mushran | 18cfdf1 | 2010-10-07 16:47:03 -0700 | [diff] [blame] | 1671 | status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map); |
| 1672 | if (status) { |
| 1673 | mlog_errno(status); |
| 1674 | goto bail; |
| 1675 | } |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 1676 | status = dlm_send_regions(dlm, ctxt->yes_resp_map); |
| 1677 | if (status) { |
| 1678 | mlog_errno(status); |
| 1679 | goto bail; |
| 1680 | } |
| 1681 | } |
| 1682 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1683 | dlm_send_join_asserts(dlm, ctxt->yes_resp_map); |
| 1684 | |
| 1685 | /* Joined state *must* be set before the joining node |
| 1686 | * information, otherwise the query_join handler may read no |
| 1687 | * current joiner but a state of NEW and tell joining nodes |
| 1688 | * we're not in the domain. */ |
| 1689 | spin_lock(&dlm_domain_lock); |
| 1690 | dlm->dlm_state = DLM_CTXT_JOINED; |
| 1691 | dlm->num_joins++; |
| 1692 | spin_unlock(&dlm_domain_lock); |
| 1693 | |
| 1694 | bail: |
| 1695 | spin_lock(&dlm->spinlock); |
| 1696 | __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN); |
Sunil Mushran | 8decab3 | 2011-07-24 10:23:54 -0700 | [diff] [blame] | 1697 | if (!status) { |
| 1698 | printk(KERN_NOTICE "o2dlm: Joining domain %s ", dlm->name); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1699 | __dlm_print_nodes(dlm); |
Sunil Mushran | 8decab3 | 2011-07-24 10:23:54 -0700 | [diff] [blame] | 1700 | } |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1701 | spin_unlock(&dlm->spinlock); |
| 1702 | |
| 1703 | if (ctxt) { |
| 1704 | /* Do we need to send a cancel message to any nodes? */ |
| 1705 | if (status < 0) { |
| 1706 | tmpstat = dlm_send_join_cancels(dlm, |
| 1707 | ctxt->yes_resp_map, |
| 1708 | sizeof(ctxt->yes_resp_map)); |
| 1709 | if (tmpstat < 0) |
| 1710 | mlog_errno(tmpstat); |
| 1711 | } |
| 1712 | kfree(ctxt); |
| 1713 | } |
| 1714 | |
| 1715 | mlog(0, "returning %d\n", status); |
| 1716 | return status; |
| 1717 | } |
| 1718 | |
| 1719 | static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm) |
| 1720 | { |
Sunil Mushran | 58a3158 | 2010-12-14 14:14:29 -0800 | [diff] [blame] | 1721 | o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up); |
| 1722 | o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1723 | o2net_unregister_handler_list(&dlm->dlm_domain_handlers); |
| 1724 | } |
| 1725 | |
| 1726 | static int dlm_register_domain_handlers(struct dlm_ctxt *dlm) |
| 1727 | { |
| 1728 | int status; |
| 1729 | |
| 1730 | mlog(0, "registering handlers.\n"); |
| 1731 | |
| 1732 | o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB, |
| 1733 | dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI); |
Sunil Mushran | 58a3158 | 2010-12-14 14:14:29 -0800 | [diff] [blame] | 1734 | status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1735 | if (status) |
| 1736 | goto bail; |
| 1737 | |
| 1738 | o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB, |
| 1739 | dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI); |
Sunil Mushran | 58a3158 | 2010-12-14 14:14:29 -0800 | [diff] [blame] | 1740 | status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_up); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1741 | if (status) |
| 1742 | goto bail; |
| 1743 | |
| 1744 | status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key, |
| 1745 | sizeof(struct dlm_master_request), |
| 1746 | dlm_master_request_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1747 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1748 | if (status) |
| 1749 | goto bail; |
| 1750 | |
| 1751 | status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key, |
| 1752 | sizeof(struct dlm_assert_master), |
| 1753 | dlm_assert_master_handler, |
Kurt Hackel | 3b8118c | 2007-01-17 17:05:53 -0800 | [diff] [blame] | 1754 | dlm, dlm_assert_master_post_handler, |
| 1755 | &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1756 | if (status) |
| 1757 | goto bail; |
| 1758 | |
| 1759 | status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key, |
| 1760 | sizeof(struct dlm_create_lock), |
| 1761 | dlm_create_lock_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1762 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1763 | if (status) |
| 1764 | goto bail; |
| 1765 | |
| 1766 | status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key, |
| 1767 | DLM_CONVERT_LOCK_MAX_LEN, |
| 1768 | dlm_convert_lock_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1769 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1770 | if (status) |
| 1771 | goto bail; |
| 1772 | |
| 1773 | status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key, |
| 1774 | DLM_UNLOCK_LOCK_MAX_LEN, |
| 1775 | dlm_unlock_lock_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1776 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1777 | if (status) |
| 1778 | goto bail; |
| 1779 | |
| 1780 | status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key, |
| 1781 | DLM_PROXY_AST_MAX_LEN, |
| 1782 | dlm_proxy_ast_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1783 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1784 | if (status) |
| 1785 | goto bail; |
| 1786 | |
| 1787 | status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key, |
| 1788 | sizeof(struct dlm_exit_domain), |
| 1789 | dlm_exit_domain_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1790 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1791 | if (status) |
| 1792 | goto bail; |
| 1793 | |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 1794 | status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key, |
| 1795 | sizeof(struct dlm_deref_lockres), |
| 1796 | dlm_deref_lockres_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1797 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 1798 | if (status) |
| 1799 | goto bail; |
| 1800 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1801 | status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key, |
| 1802 | sizeof(struct dlm_migrate_request), |
| 1803 | dlm_migrate_request_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1804 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1805 | if (status) |
| 1806 | goto bail; |
| 1807 | |
| 1808 | status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key, |
| 1809 | DLM_MIG_LOCKRES_MAX_LEN, |
| 1810 | dlm_mig_lockres_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1811 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1812 | if (status) |
| 1813 | goto bail; |
| 1814 | |
| 1815 | status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key, |
| 1816 | sizeof(struct dlm_master_requery), |
| 1817 | dlm_master_requery_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1818 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1819 | if (status) |
| 1820 | goto bail; |
| 1821 | |
| 1822 | status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key, |
| 1823 | sizeof(struct dlm_lock_request), |
| 1824 | dlm_request_all_locks_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1825 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1826 | if (status) |
| 1827 | goto bail; |
| 1828 | |
| 1829 | status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key, |
| 1830 | sizeof(struct dlm_reco_data_done), |
| 1831 | dlm_reco_data_done_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1832 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1833 | if (status) |
| 1834 | goto bail; |
| 1835 | |
| 1836 | status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key, |
| 1837 | sizeof(struct dlm_begin_reco), |
| 1838 | dlm_begin_reco_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1839 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1840 | if (status) |
| 1841 | goto bail; |
| 1842 | |
| 1843 | status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key, |
| 1844 | sizeof(struct dlm_finalize_reco), |
| 1845 | dlm_finalize_reco_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1846 | dlm, NULL, &dlm->dlm_domain_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1847 | if (status) |
| 1848 | goto bail; |
| 1849 | |
Sunil Mushran | bddefde | 2011-05-19 14:34:11 -0700 | [diff] [blame] | 1850 | status = o2net_register_handler(DLM_BEGIN_EXIT_DOMAIN_MSG, dlm->key, |
| 1851 | sizeof(struct dlm_exit_domain), |
| 1852 | dlm_begin_exit_domain_handler, |
| 1853 | dlm, NULL, &dlm->dlm_domain_handlers); |
| 1854 | if (status) |
| 1855 | goto bail; |
| 1856 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1857 | bail: |
| 1858 | if (status) |
| 1859 | dlm_unregister_domain_handlers(dlm); |
| 1860 | |
| 1861 | return status; |
| 1862 | } |
| 1863 | |
| 1864 | static int dlm_join_domain(struct dlm_ctxt *dlm) |
| 1865 | { |
| 1866 | int status; |
Sunil Mushran | 0dd8214 | 2007-01-29 15:44:27 -0800 | [diff] [blame] | 1867 | unsigned int backoff; |
| 1868 | unsigned int total_backoff = 0; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1869 | |
| 1870 | BUG_ON(!dlm); |
| 1871 | |
| 1872 | mlog(0, "Join domain %s\n", dlm->name); |
| 1873 | |
| 1874 | status = dlm_register_domain_handlers(dlm); |
| 1875 | if (status) { |
| 1876 | mlog_errno(status); |
| 1877 | goto bail; |
| 1878 | } |
| 1879 | |
| 1880 | status = dlm_launch_thread(dlm); |
| 1881 | if (status < 0) { |
| 1882 | mlog_errno(status); |
| 1883 | goto bail; |
| 1884 | } |
| 1885 | |
| 1886 | status = dlm_launch_recovery_thread(dlm); |
| 1887 | if (status < 0) { |
| 1888 | mlog_errno(status); |
| 1889 | goto bail; |
| 1890 | } |
| 1891 | |
Zongxun Wang | 181a9a0 | 2014-04-03 14:46:45 -0700 | [diff] [blame^] | 1892 | status = dlm_debug_init(dlm); |
| 1893 | if (status < 0) { |
| 1894 | mlog_errno(status); |
| 1895 | goto bail; |
| 1896 | } |
| 1897 | |
Kurt Hackel | 3156d26 | 2006-05-01 14:39:29 -0700 | [diff] [blame] | 1898 | dlm->dlm_worker = create_singlethread_workqueue("dlm_wq"); |
| 1899 | if (!dlm->dlm_worker) { |
| 1900 | status = -ENOMEM; |
| 1901 | mlog_errno(status); |
| 1902 | goto bail; |
| 1903 | } |
| 1904 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1905 | do { |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1906 | status = dlm_try_to_join_domain(dlm); |
| 1907 | |
| 1908 | /* If we're racing another node to the join, then we |
| 1909 | * need to back off temporarily and let them |
| 1910 | * complete. */ |
Sunil Mushran | 0dd8214 | 2007-01-29 15:44:27 -0800 | [diff] [blame] | 1911 | #define DLM_JOIN_TIMEOUT_MSECS 90000 |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1912 | if (status == -EAGAIN) { |
| 1913 | if (signal_pending(current)) { |
| 1914 | status = -ERESTARTSYS; |
| 1915 | goto bail; |
| 1916 | } |
| 1917 | |
Sunil Mushran | 0dd8214 | 2007-01-29 15:44:27 -0800 | [diff] [blame] | 1918 | if (total_backoff > |
| 1919 | msecs_to_jiffies(DLM_JOIN_TIMEOUT_MSECS)) { |
| 1920 | status = -ERESTARTSYS; |
| 1921 | mlog(ML_NOTICE, "Timed out joining dlm domain " |
| 1922 | "%s after %u msecs\n", dlm->name, |
| 1923 | jiffies_to_msecs(total_backoff)); |
| 1924 | goto bail; |
| 1925 | } |
| 1926 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1927 | /* |
| 1928 | * <chip> After you! |
| 1929 | * <dale> No, after you! |
| 1930 | * <chip> I insist! |
| 1931 | * <dale> But you first! |
| 1932 | * ... |
| 1933 | */ |
| 1934 | backoff = (unsigned int)(jiffies & 0x3); |
| 1935 | backoff *= DLM_DOMAIN_BACKOFF_MS; |
Sunil Mushran | 0dd8214 | 2007-01-29 15:44:27 -0800 | [diff] [blame] | 1936 | total_backoff += backoff; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1937 | mlog(0, "backoff %d\n", backoff); |
| 1938 | msleep(backoff); |
| 1939 | } |
| 1940 | } while (status == -EAGAIN); |
| 1941 | |
| 1942 | if (status < 0) { |
| 1943 | mlog_errno(status); |
| 1944 | goto bail; |
| 1945 | } |
| 1946 | |
| 1947 | status = 0; |
| 1948 | bail: |
| 1949 | wake_up(&dlm_domain_events); |
| 1950 | |
| 1951 | if (status) { |
| 1952 | dlm_unregister_domain_handlers(dlm); |
Sunil Mushran | 007dce5 | 2008-03-10 15:16:23 -0700 | [diff] [blame] | 1953 | dlm_debug_shutdown(dlm); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1954 | dlm_complete_thread(dlm); |
| 1955 | dlm_complete_recovery_thread(dlm); |
Kurt Hackel | 3156d26 | 2006-05-01 14:39:29 -0700 | [diff] [blame] | 1956 | dlm_destroy_dlm_worker(dlm); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1957 | } |
| 1958 | |
| 1959 | return status; |
| 1960 | } |
| 1961 | |
| 1962 | static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain, |
| 1963 | u32 key) |
| 1964 | { |
| 1965 | int i; |
Sunil Mushran | 6325b4a | 2008-03-10 15:16:22 -0700 | [diff] [blame] | 1966 | int ret; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1967 | struct dlm_ctxt *dlm = NULL; |
| 1968 | |
Robert P. J. Day | cd86128 | 2006-12-13 00:34:52 -0800 | [diff] [blame] | 1969 | dlm = kzalloc(sizeof(*dlm), GFP_KERNEL); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1970 | if (!dlm) { |
| 1971 | mlog_errno(-ENOMEM); |
| 1972 | goto leave; |
| 1973 | } |
| 1974 | |
Julia Lawall | 316ce2b | 2010-05-14 21:30:48 +0200 | [diff] [blame] | 1975 | dlm->name = kstrdup(domain, GFP_KERNEL); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1976 | if (dlm->name == NULL) { |
| 1977 | mlog_errno(-ENOMEM); |
| 1978 | kfree(dlm); |
| 1979 | dlm = NULL; |
| 1980 | goto leave; |
| 1981 | } |
| 1982 | |
Daniel Phillips | 03d864c | 2006-03-10 18:08:16 -0800 | [diff] [blame] | 1983 | dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES); |
Mark Fasheh | 81f2094 | 2006-02-28 17:31:22 -0800 | [diff] [blame] | 1984 | if (!dlm->lockres_hash) { |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1985 | mlog_errno(-ENOMEM); |
| 1986 | kfree(dlm->name); |
| 1987 | kfree(dlm); |
| 1988 | dlm = NULL; |
| 1989 | goto leave; |
| 1990 | } |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1991 | |
Daniel Phillips | 03d864c | 2006-03-10 18:08:16 -0800 | [diff] [blame] | 1992 | for (i = 0; i < DLM_HASH_BUCKETS; i++) |
| 1993 | INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i)); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1994 | |
Sunil Mushran | e2b66dd | 2009-02-26 15:00:40 -0800 | [diff] [blame] | 1995 | dlm->master_hash = (struct hlist_head **) |
| 1996 | dlm_alloc_pagevec(DLM_HASH_PAGES); |
| 1997 | if (!dlm->master_hash) { |
| 1998 | mlog_errno(-ENOMEM); |
| 1999 | dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES); |
| 2000 | kfree(dlm->name); |
| 2001 | kfree(dlm); |
| 2002 | dlm = NULL; |
| 2003 | goto leave; |
| 2004 | } |
| 2005 | |
| 2006 | for (i = 0; i < DLM_HASH_BUCKETS; i++) |
| 2007 | INIT_HLIST_HEAD(dlm_master_hash(dlm, i)); |
| 2008 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2009 | dlm->key = key; |
| 2010 | dlm->node_num = o2nm_this_node(); |
| 2011 | |
Sunil Mushran | 6325b4a | 2008-03-10 15:16:22 -0700 | [diff] [blame] | 2012 | ret = dlm_create_debugfs_subroot(dlm); |
| 2013 | if (ret < 0) { |
Sunil Mushran | e2b66dd | 2009-02-26 15:00:40 -0800 | [diff] [blame] | 2014 | dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES); |
Sunil Mushran | 6325b4a | 2008-03-10 15:16:22 -0700 | [diff] [blame] | 2015 | dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES); |
| 2016 | kfree(dlm->name); |
| 2017 | kfree(dlm); |
| 2018 | dlm = NULL; |
| 2019 | goto leave; |
| 2020 | } |
| 2021 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2022 | spin_lock_init(&dlm->spinlock); |
| 2023 | spin_lock_init(&dlm->master_lock); |
| 2024 | spin_lock_init(&dlm->ast_lock); |
Sunil Mushran | b0d4f817 | 2008-12-16 15:49:22 -0800 | [diff] [blame] | 2025 | spin_lock_init(&dlm->track_lock); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2026 | INIT_LIST_HEAD(&dlm->list); |
| 2027 | INIT_LIST_HEAD(&dlm->dirty_list); |
| 2028 | INIT_LIST_HEAD(&dlm->reco.resources); |
| 2029 | INIT_LIST_HEAD(&dlm->reco.received); |
| 2030 | INIT_LIST_HEAD(&dlm->reco.node_data); |
| 2031 | INIT_LIST_HEAD(&dlm->purge_list); |
| 2032 | INIT_LIST_HEAD(&dlm->dlm_domain_handlers); |
Sunil Mushran | 29576f8 | 2008-03-10 15:16:21 -0700 | [diff] [blame] | 2033 | INIT_LIST_HEAD(&dlm->tracking_list); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2034 | dlm->reco.state = 0; |
| 2035 | |
| 2036 | INIT_LIST_HEAD(&dlm->pending_asts); |
| 2037 | INIT_LIST_HEAD(&dlm->pending_basts); |
| 2038 | |
| 2039 | mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n", |
| 2040 | dlm->recovery_map, &(dlm->recovery_map[0])); |
| 2041 | |
| 2042 | memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map)); |
| 2043 | memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map)); |
| 2044 | memset(dlm->domain_map, 0, sizeof(dlm->domain_map)); |
| 2045 | |
| 2046 | dlm->dlm_thread_task = NULL; |
| 2047 | dlm->dlm_reco_thread_task = NULL; |
Kurt Hackel | 3156d26 | 2006-05-01 14:39:29 -0700 | [diff] [blame] | 2048 | dlm->dlm_worker = NULL; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2049 | init_waitqueue_head(&dlm->dlm_thread_wq); |
| 2050 | init_waitqueue_head(&dlm->dlm_reco_thread_wq); |
| 2051 | init_waitqueue_head(&dlm->reco.event); |
| 2052 | init_waitqueue_head(&dlm->ast_wq); |
| 2053 | init_waitqueue_head(&dlm->migration_wq); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2054 | INIT_LIST_HEAD(&dlm->mle_hb_events); |
| 2055 | |
| 2056 | dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN; |
| 2057 | init_waitqueue_head(&dlm->dlm_join_events); |
| 2058 | |
| 2059 | dlm->reco.new_master = O2NM_INVALID_NODE_NUM; |
| 2060 | dlm->reco.dead_node = O2NM_INVALID_NODE_NUM; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2061 | |
Sunil Mushran | 6800791 | 2009-02-26 15:00:44 -0800 | [diff] [blame] | 2062 | atomic_set(&dlm->res_tot_count, 0); |
| 2063 | atomic_set(&dlm->res_cur_count, 0); |
Sunil Mushran | 2041d8f | 2009-02-26 15:00:43 -0800 | [diff] [blame] | 2064 | for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) { |
| 2065 | atomic_set(&dlm->mle_tot_count[i], 0); |
| 2066 | atomic_set(&dlm->mle_cur_count[i], 0); |
| 2067 | } |
| 2068 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2069 | spin_lock_init(&dlm->work_lock); |
| 2070 | INIT_LIST_HEAD(&dlm->work_list); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 2071 | INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2072 | |
| 2073 | kref_init(&dlm->dlm_refs); |
| 2074 | dlm->dlm_state = DLM_CTXT_NEW; |
| 2075 | |
| 2076 | INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks); |
| 2077 | |
| 2078 | mlog(0, "context init: refcount %u\n", |
| 2079 | atomic_read(&dlm->dlm_refs.refcount)); |
| 2080 | |
| 2081 | leave: |
| 2082 | return dlm; |
| 2083 | } |
| 2084 | |
| 2085 | /* |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 2086 | * Compare a requested locking protocol version against the current one. |
| 2087 | * |
| 2088 | * If the major numbers are different, they are incompatible. |
| 2089 | * If the current minor is greater than the request, they are incompatible. |
| 2090 | * If the current minor is less than or equal to the request, they are |
| 2091 | * compatible, and the requester should run at the current minor version. |
| 2092 | */ |
| 2093 | static int dlm_protocol_compare(struct dlm_protocol_version *existing, |
| 2094 | struct dlm_protocol_version *request) |
| 2095 | { |
| 2096 | if (existing->pv_major != request->pv_major) |
| 2097 | return 1; |
| 2098 | |
| 2099 | if (existing->pv_minor > request->pv_minor) |
| 2100 | return 1; |
| 2101 | |
| 2102 | if (existing->pv_minor < request->pv_minor) |
| 2103 | request->pv_minor = existing->pv_minor; |
| 2104 | |
| 2105 | return 0; |
| 2106 | } |
| 2107 | |
| 2108 | /* |
| 2109 | * dlm_register_domain: one-time setup per "domain". |
| 2110 | * |
| 2111 | * The filesystem passes in the requested locking version via proto. |
| 2112 | * If registration was successful, proto will contain the negotiated |
| 2113 | * locking protocol. |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2114 | */ |
| 2115 | struct dlm_ctxt * dlm_register_domain(const char *domain, |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 2116 | u32 key, |
| 2117 | struct dlm_protocol_version *fs_proto) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2118 | { |
| 2119 | int ret; |
| 2120 | struct dlm_ctxt *dlm = NULL; |
| 2121 | struct dlm_ctxt *new_ctxt = NULL; |
| 2122 | |
Dan Carpenter | e372357 | 2010-07-10 16:33:36 +0200 | [diff] [blame] | 2123 | if (strlen(domain) >= O2NM_MAX_NAME_LEN) { |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2124 | ret = -ENAMETOOLONG; |
| 2125 | mlog(ML_ERROR, "domain name length too long\n"); |
| 2126 | goto leave; |
| 2127 | } |
| 2128 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2129 | mlog(0, "register called for domain \"%s\"\n", domain); |
| 2130 | |
| 2131 | retry: |
| 2132 | dlm = NULL; |
| 2133 | if (signal_pending(current)) { |
| 2134 | ret = -ERESTARTSYS; |
| 2135 | mlog_errno(ret); |
| 2136 | goto leave; |
| 2137 | } |
| 2138 | |
| 2139 | spin_lock(&dlm_domain_lock); |
| 2140 | |
| 2141 | dlm = __dlm_lookup_domain(domain); |
| 2142 | if (dlm) { |
| 2143 | if (dlm->dlm_state != DLM_CTXT_JOINED) { |
| 2144 | spin_unlock(&dlm_domain_lock); |
| 2145 | |
| 2146 | mlog(0, "This ctxt is not joined yet!\n"); |
| 2147 | wait_event_interruptible(dlm_domain_events, |
| 2148 | dlm_wait_on_domain_helper( |
| 2149 | domain)); |
| 2150 | goto retry; |
| 2151 | } |
| 2152 | |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 2153 | if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) { |
Julia Lawall | 6469272 | 2010-05-26 17:58:53 +0200 | [diff] [blame] | 2154 | spin_unlock(&dlm_domain_lock); |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 2155 | mlog(ML_ERROR, |
| 2156 | "Requested locking protocol version is not " |
| 2157 | "compatible with already registered domain " |
| 2158 | "\"%s\"\n", domain); |
| 2159 | ret = -EPROTO; |
| 2160 | goto leave; |
| 2161 | } |
| 2162 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2163 | __dlm_get(dlm); |
| 2164 | dlm->num_joins++; |
| 2165 | |
| 2166 | spin_unlock(&dlm_domain_lock); |
| 2167 | |
| 2168 | ret = 0; |
| 2169 | goto leave; |
| 2170 | } |
| 2171 | |
| 2172 | /* doesn't exist */ |
| 2173 | if (!new_ctxt) { |
| 2174 | spin_unlock(&dlm_domain_lock); |
| 2175 | |
| 2176 | new_ctxt = dlm_alloc_ctxt(domain, key); |
| 2177 | if (new_ctxt) |
| 2178 | goto retry; |
| 2179 | |
| 2180 | ret = -ENOMEM; |
| 2181 | mlog_errno(ret); |
| 2182 | goto leave; |
| 2183 | } |
| 2184 | |
| 2185 | /* a little variable switch-a-roo here... */ |
| 2186 | dlm = new_ctxt; |
| 2187 | new_ctxt = NULL; |
| 2188 | |
| 2189 | /* add the new domain */ |
| 2190 | list_add_tail(&dlm->list, &dlm_domains); |
| 2191 | spin_unlock(&dlm_domain_lock); |
| 2192 | |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 2193 | /* |
| 2194 | * Pass the locking protocol version into the join. If the join |
| 2195 | * succeeds, it will have the negotiated protocol set. |
| 2196 | */ |
| 2197 | dlm->dlm_locking_proto = dlm_protocol; |
| 2198 | dlm->fs_locking_proto = *fs_proto; |
| 2199 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2200 | ret = dlm_join_domain(dlm); |
| 2201 | if (ret) { |
| 2202 | mlog_errno(ret); |
| 2203 | dlm_put(dlm); |
| 2204 | goto leave; |
| 2205 | } |
| 2206 | |
Joel Becker | d24fbcd | 2008-01-25 17:02:21 -0800 | [diff] [blame] | 2207 | /* Tell the caller what locking protocol we negotiated */ |
| 2208 | *fs_proto = dlm->fs_locking_proto; |
| 2209 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2210 | ret = 0; |
| 2211 | leave: |
| 2212 | if (new_ctxt) |
| 2213 | dlm_free_ctxt_mem(new_ctxt); |
| 2214 | |
| 2215 | if (ret < 0) |
| 2216 | dlm = ERR_PTR(ret); |
| 2217 | |
| 2218 | return dlm; |
| 2219 | } |
| 2220 | EXPORT_SYMBOL_GPL(dlm_register_domain); |
| 2221 | |
| 2222 | static LIST_HEAD(dlm_join_handlers); |
| 2223 | |
| 2224 | static void dlm_unregister_net_handlers(void) |
| 2225 | { |
| 2226 | o2net_unregister_handler_list(&dlm_join_handlers); |
| 2227 | } |
| 2228 | |
| 2229 | static int dlm_register_net_handlers(void) |
| 2230 | { |
| 2231 | int status = 0; |
| 2232 | |
| 2233 | status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, |
| 2234 | sizeof(struct dlm_query_join_request), |
| 2235 | dlm_query_join_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 2236 | NULL, NULL, &dlm_join_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2237 | if (status) |
| 2238 | goto bail; |
| 2239 | |
| 2240 | status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY, |
| 2241 | sizeof(struct dlm_assert_joined), |
| 2242 | dlm_assert_joined_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 2243 | NULL, NULL, &dlm_join_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2244 | if (status) |
| 2245 | goto bail; |
| 2246 | |
| 2247 | status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY, |
| 2248 | sizeof(struct dlm_cancel_join), |
| 2249 | dlm_cancel_join_handler, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 2250 | NULL, NULL, &dlm_join_handlers); |
Sunil Mushran | ea20344 | 2010-10-09 10:26:23 -0700 | [diff] [blame] | 2251 | if (status) |
| 2252 | goto bail; |
| 2253 | |
| 2254 | status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY, |
| 2255 | sizeof(struct dlm_query_region), |
| 2256 | dlm_query_region_handler, |
| 2257 | NULL, NULL, &dlm_join_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2258 | |
Sunil Mushran | 18cfdf1 | 2010-10-07 16:47:03 -0700 | [diff] [blame] | 2259 | if (status) |
| 2260 | goto bail; |
| 2261 | |
| 2262 | status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY, |
| 2263 | sizeof(struct dlm_query_nodeinfo), |
| 2264 | dlm_query_nodeinfo_handler, |
| 2265 | NULL, NULL, &dlm_join_handlers); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2266 | bail: |
| 2267 | if (status < 0) |
| 2268 | dlm_unregister_net_handlers(); |
| 2269 | |
| 2270 | return status; |
| 2271 | } |
| 2272 | |
| 2273 | /* Domain eviction callback handling. |
| 2274 | * |
| 2275 | * The file system requires notification of node death *before* the |
| 2276 | * dlm completes it's recovery work, otherwise it may be able to |
| 2277 | * acquire locks on resources requiring recovery. Since the dlm can |
| 2278 | * evict a node from it's domain *before* heartbeat fires, a similar |
| 2279 | * mechanism is required. */ |
| 2280 | |
| 2281 | /* Eviction is not expected to happen often, so a per-domain lock is |
| 2282 | * not necessary. Eviction callbacks are allowed to sleep for short |
| 2283 | * periods of time. */ |
| 2284 | static DECLARE_RWSEM(dlm_callback_sem); |
| 2285 | |
| 2286 | void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm, |
| 2287 | int node_num) |
| 2288 | { |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2289 | struct dlm_eviction_cb *cb; |
| 2290 | |
| 2291 | down_read(&dlm_callback_sem); |
Dong Fang | df53cd3 | 2013-09-11 14:19:50 -0700 | [diff] [blame] | 2292 | list_for_each_entry(cb, &dlm->dlm_eviction_callbacks, ec_item) { |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2293 | cb->ec_func(node_num, cb->ec_data); |
| 2294 | } |
| 2295 | up_read(&dlm_callback_sem); |
| 2296 | } |
| 2297 | |
| 2298 | void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb, |
| 2299 | dlm_eviction_func *f, |
| 2300 | void *data) |
| 2301 | { |
| 2302 | INIT_LIST_HEAD(&cb->ec_item); |
| 2303 | cb->ec_func = f; |
| 2304 | cb->ec_data = data; |
| 2305 | } |
| 2306 | EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb); |
| 2307 | |
| 2308 | void dlm_register_eviction_cb(struct dlm_ctxt *dlm, |
| 2309 | struct dlm_eviction_cb *cb) |
| 2310 | { |
| 2311 | down_write(&dlm_callback_sem); |
| 2312 | list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks); |
| 2313 | up_write(&dlm_callback_sem); |
| 2314 | } |
| 2315 | EXPORT_SYMBOL_GPL(dlm_register_eviction_cb); |
| 2316 | |
| 2317 | void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb) |
| 2318 | { |
| 2319 | down_write(&dlm_callback_sem); |
| 2320 | list_del_init(&cb->ec_item); |
| 2321 | up_write(&dlm_callback_sem); |
| 2322 | } |
| 2323 | EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb); |
| 2324 | |
| 2325 | static int __init dlm_init(void) |
| 2326 | { |
| 2327 | int status; |
| 2328 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2329 | status = dlm_init_mle_cache(); |
Sunil Mushran | 12eb003 | 2008-03-10 15:16:19 -0700 | [diff] [blame] | 2330 | if (status) { |
| 2331 | mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n"); |
Sunil Mushran | 724bdca | 2008-03-10 15:16:20 -0700 | [diff] [blame] | 2332 | goto error; |
| 2333 | } |
| 2334 | |
| 2335 | status = dlm_init_master_caches(); |
| 2336 | if (status) { |
| 2337 | mlog(ML_ERROR, "Could not create o2dlm_lockres and " |
| 2338 | "o2dlm_lockname slabcaches\n"); |
| 2339 | goto error; |
| 2340 | } |
| 2341 | |
| 2342 | status = dlm_init_lock_cache(); |
| 2343 | if (status) { |
| 2344 | mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n"); |
| 2345 | goto error; |
Sunil Mushran | 12eb003 | 2008-03-10 15:16:19 -0700 | [diff] [blame] | 2346 | } |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2347 | |
| 2348 | status = dlm_register_net_handlers(); |
| 2349 | if (status) { |
Sunil Mushran | 724bdca | 2008-03-10 15:16:20 -0700 | [diff] [blame] | 2350 | mlog(ML_ERROR, "Unable to register network handlers\n"); |
| 2351 | goto error; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2352 | } |
| 2353 | |
Sunil Mushran | 6325b4a | 2008-03-10 15:16:22 -0700 | [diff] [blame] | 2354 | status = dlm_create_debugfs_root(); |
| 2355 | if (status) |
| 2356 | goto error; |
| 2357 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2358 | return 0; |
Sunil Mushran | 724bdca | 2008-03-10 15:16:20 -0700 | [diff] [blame] | 2359 | error: |
Sunil Mushran | 6325b4a | 2008-03-10 15:16:22 -0700 | [diff] [blame] | 2360 | dlm_unregister_net_handlers(); |
Sunil Mushran | 724bdca | 2008-03-10 15:16:20 -0700 | [diff] [blame] | 2361 | dlm_destroy_lock_cache(); |
| 2362 | dlm_destroy_master_caches(); |
| 2363 | dlm_destroy_mle_cache(); |
| 2364 | return -1; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2365 | } |
| 2366 | |
| 2367 | static void __exit dlm_exit (void) |
| 2368 | { |
Sunil Mushran | 6325b4a | 2008-03-10 15:16:22 -0700 | [diff] [blame] | 2369 | dlm_destroy_debugfs_root(); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2370 | dlm_unregister_net_handlers(); |
Sunil Mushran | 724bdca | 2008-03-10 15:16:20 -0700 | [diff] [blame] | 2371 | dlm_destroy_lock_cache(); |
| 2372 | dlm_destroy_master_caches(); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2373 | dlm_destroy_mle_cache(); |
| 2374 | } |
| 2375 | |
| 2376 | MODULE_AUTHOR("Oracle"); |
| 2377 | MODULE_LICENSE("GPL"); |
Goldwyn Rodrigues | ff8fb33 | 2014-01-21 15:48:20 -0800 | [diff] [blame] | 2378 | MODULE_DESCRIPTION("OCFS2 Distributed Lock Management"); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2379 | |
| 2380 | module_init(dlm_init); |
| 2381 | module_exit(dlm_exit); |