1 /****************************************************************************** 2 ******************************************************************************* 3 ** 4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 5 ** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. 6 ** 7 ** This copyrighted material is made available to anyone wishing to use, 8 ** modify, copy, or redistribute it subject to the terms and conditions 9 ** of the GNU General Public License v.2. 10 ** 11 ******************************************************************************* 12 ******************************************************************************/ 13 14 #include "dlm_internal.h" 15 #include "lockspace.h" 16 #include "member.h" 17 #include "dir.h" 18 #include "ast.h" 19 #include "recover.h" 20 #include "lowcomms.h" 21 #include "lock.h" 22 #include "requestqueue.h" 23 #include "recoverd.h" 24 25 26 /* If the start for which we're re-enabling locking (seq) has been superseded 27 by a newer stop (ls_recover_seq), we need to leave locking disabled. */ 28 29 static int enable_locking(struct dlm_ls *ls, uint64_t seq) 30 { 31 int error = -EINTR; 32 33 spin_lock(&ls->ls_recover_lock); 34 if (ls->ls_recover_seq == seq) { 35 set_bit(LSFL_RUNNING, &ls->ls_flags); 36 up_write(&ls->ls_in_recovery); 37 error = 0; 38 } 39 spin_unlock(&ls->ls_recover_lock); 40 return error; 41 } 42 43 static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv) 44 { 45 unsigned long start; 46 int error, neg = 0; 47 48 log_debug(ls, "recover %llx", (unsigned long long)rv->seq); 49 50 mutex_lock(&ls->ls_recoverd_active); 51 52 /* 53 * Suspending and resuming dlm_astd ensures that no lkb's from this ls 54 * will be processed by dlm_astd during recovery. 55 */ 56 57 dlm_astd_suspend(); 58 dlm_astd_resume(); 59 60 /* 61 * This list of root rsb's will be the basis of most of the recovery 62 * routines. 63 */ 64 65 dlm_create_root_list(ls); 66 67 /* 68 * Free all the tossed rsb's so we don't have to recover them. 69 */ 70 71 dlm_clear_toss_list(ls); 72 73 /* 74 * Add or remove nodes from the lockspace's ls_nodes list. 75 * Also waits for all nodes to complete dlm_recover_members. 76 */ 77 78 error = dlm_recover_members(ls, rv, &neg); 79 if (error) { 80 log_debug(ls, "recover_members failed %d", error); 81 goto fail; 82 } 83 start = jiffies; 84 85 /* 86 * Rebuild our own share of the directory by collecting from all other 87 * nodes their master rsb names that hash to us. 88 */ 89 90 error = dlm_recover_directory(ls); 91 if (error) { 92 log_debug(ls, "recover_directory failed %d", error); 93 goto fail; 94 } 95 96 /* 97 * Wait for all nodes to complete directory rebuild. 98 */ 99 100 error = dlm_recover_directory_wait(ls); 101 if (error) { 102 log_debug(ls, "recover_directory_wait failed %d", error); 103 goto fail; 104 } 105 106 /* 107 * We may have outstanding operations that are waiting for a reply from 108 * a failed node. Mark these to be resent after recovery. Unlock and 109 * cancel ops can just be completed. 110 */ 111 112 dlm_recover_waiters_pre(ls); 113 114 error = dlm_recovery_stopped(ls); 115 if (error) 116 goto fail; 117 118 if (neg || dlm_no_directory(ls)) { 119 /* 120 * Clear lkb's for departed nodes. 121 */ 122 123 dlm_purge_locks(ls); 124 125 /* 126 * Get new master nodeid's for rsb's that were mastered on 127 * departed nodes. 128 */ 129 130 error = dlm_recover_masters(ls); 131 if (error) { 132 log_debug(ls, "recover_masters failed %d", error); 133 goto fail; 134 } 135 136 /* 137 * Send our locks on remastered rsb's to the new masters. 138 */ 139 140 error = dlm_recover_locks(ls); 141 if (error) { 142 log_debug(ls, "recover_locks failed %d", error); 143 goto fail; 144 } 145 146 error = dlm_recover_locks_wait(ls); 147 if (error) { 148 log_debug(ls, "recover_locks_wait failed %d", error); 149 goto fail; 150 } 151 152 /* 153 * Finalize state in master rsb's now that all locks can be 154 * checked. This includes conversion resolution and lvb 155 * settings. 156 */ 157 158 dlm_recover_rsbs(ls); 159 } else { 160 /* 161 * Other lockspace members may be going through the "neg" steps 162 * while also adding us to the lockspace, in which case they'll 163 * be doing the recover_locks (RS_LOCKS) barrier. 164 */ 165 dlm_set_recover_status(ls, DLM_RS_LOCKS); 166 167 error = dlm_recover_locks_wait(ls); 168 if (error) { 169 log_debug(ls, "recover_locks_wait failed %d", error); 170 goto fail; 171 } 172 } 173 174 dlm_release_root_list(ls); 175 176 /* 177 * Purge directory-related requests that are saved in requestqueue. 178 * All dir requests from before recovery are invalid now due to the dir 179 * rebuild and will be resent by the requesting nodes. 180 */ 181 182 dlm_purge_requestqueue(ls); 183 184 dlm_set_recover_status(ls, DLM_RS_DONE); 185 error = dlm_recover_done_wait(ls); 186 if (error) { 187 log_debug(ls, "recover_done_wait failed %d", error); 188 goto fail; 189 } 190 191 dlm_clear_members_gone(ls); 192 193 error = enable_locking(ls, rv->seq); 194 if (error) { 195 log_debug(ls, "enable_locking failed %d", error); 196 goto fail; 197 } 198 199 error = dlm_process_requestqueue(ls); 200 if (error) { 201 log_debug(ls, "process_requestqueue failed %d", error); 202 goto fail; 203 } 204 205 error = dlm_recover_waiters_post(ls); 206 if (error) { 207 log_debug(ls, "recover_waiters_post failed %d", error); 208 goto fail; 209 } 210 211 dlm_grant_after_purge(ls); 212 213 dlm_astd_wake(); 214 215 log_debug(ls, "recover %llx done: %u ms", 216 (unsigned long long)rv->seq, 217 jiffies_to_msecs(jiffies - start)); 218 mutex_unlock(&ls->ls_recoverd_active); 219 220 return 0; 221 222 fail: 223 dlm_release_root_list(ls); 224 log_debug(ls, "recover %llx error %d", 225 (unsigned long long)rv->seq, error); 226 mutex_unlock(&ls->ls_recoverd_active); 227 return error; 228 } 229 230 /* The dlm_ls_start() that created the rv we take here may already have been 231 stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP 232 flag set. */ 233 234 static void do_ls_recovery(struct dlm_ls *ls) 235 { 236 struct dlm_recover *rv = NULL; 237 238 spin_lock(&ls->ls_recover_lock); 239 rv = ls->ls_recover_args; 240 ls->ls_recover_args = NULL; 241 if (rv && ls->ls_recover_seq == rv->seq) 242 clear_bit(LSFL_RECOVERY_STOP, &ls->ls_flags); 243 spin_unlock(&ls->ls_recover_lock); 244 245 if (rv) { 246 ls_recover(ls, rv); 247 kfree(rv->nodeids); 248 kfree(rv); 249 } 250 } 251 252 static int dlm_recoverd(void *arg) 253 { 254 struct dlm_ls *ls; 255 256 ls = dlm_find_lockspace_local(arg); 257 if (!ls) { 258 log_print("dlm_recoverd: no lockspace %p", arg); 259 return -1; 260 } 261 262 while (!kthread_should_stop()) { 263 set_current_state(TASK_INTERRUPTIBLE); 264 if (!test_bit(LSFL_WORK, &ls->ls_flags)) 265 schedule(); 266 set_current_state(TASK_RUNNING); 267 268 if (test_and_clear_bit(LSFL_WORK, &ls->ls_flags)) 269 do_ls_recovery(ls); 270 } 271 272 dlm_put_lockspace(ls); 273 return 0; 274 } 275 276 void dlm_recoverd_kick(struct dlm_ls *ls) 277 { 278 set_bit(LSFL_WORK, &ls->ls_flags); 279 wake_up_process(ls->ls_recoverd_task); 280 } 281 282 int dlm_recoverd_start(struct dlm_ls *ls) 283 { 284 struct task_struct *p; 285 int error = 0; 286 287 p = kthread_run(dlm_recoverd, ls, "dlm_recoverd"); 288 if (IS_ERR(p)) 289 error = PTR_ERR(p); 290 else 291 ls->ls_recoverd_task = p; 292 return error; 293 } 294 295 void dlm_recoverd_stop(struct dlm_ls *ls) 296 { 297 kthread_stop(ls->ls_recoverd_task); 298 } 299 300 void dlm_recoverd_suspend(struct dlm_ls *ls) 301 { 302 wake_up(&ls->ls_wait_general); 303 mutex_lock(&ls->ls_recoverd_active); 304 } 305 306 void dlm_recoverd_resume(struct dlm_ls *ls) 307 { 308 mutex_unlock(&ls->ls_recoverd_active); 309 } 310 311