1 // SPDX-License-Identifier: GPL-2.0-only 2 /****************************************************************************** 3 ******************************************************************************* 4 ** 5 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 6 ** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. 7 ** 8 ** 9 ******************************************************************************* 10 ******************************************************************************/ 11 12 #include "dlm_internal.h" 13 #include "lockspace.h" 14 #include "member.h" 15 #include "dir.h" 16 #include "ast.h" 17 #include "recover.h" 18 #include "lowcomms.h" 19 #include "lock.h" 20 #include "requestqueue.h" 21 #include "recoverd.h" 22 23 24 /* If the start for which we're re-enabling locking (seq) has been superseded 25 by a newer stop (ls_recover_seq), we need to leave locking disabled. 26 27 We suspend dlm_recv threads here to avoid the race where dlm_recv a) sees 28 locking stopped and b) adds a message to the requestqueue, but dlm_recoverd 29 enables locking and clears the requestqueue between a and b. */ 30 31 static int enable_locking(struct dlm_ls *ls, uint64_t seq) 32 { 33 int error = -EINTR; 34 35 down_write(&ls->ls_recv_active); 36 37 spin_lock(&ls->ls_recover_lock); 38 if (ls->ls_recover_seq == seq) { 39 set_bit(LSFL_RUNNING, &ls->ls_flags); 40 /* unblocks processes waiting to enter the dlm */ 41 up_write(&ls->ls_in_recovery); 42 clear_bit(LSFL_RECOVER_LOCK, &ls->ls_flags); 43 error = 0; 44 } 45 spin_unlock(&ls->ls_recover_lock); 46 47 up_write(&ls->ls_recv_active); 48 return error; 49 } 50 51 static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv) 52 { 53 unsigned long start; 54 int error, neg = 0; 55 56 log_rinfo(ls, "dlm_recover %llu", (unsigned long long)rv->seq); 57 58 mutex_lock(&ls->ls_recoverd_active); 59 60 dlm_callback_suspend(ls); 61 62 dlm_clear_toss(ls); 63 64 /* 65 * This list of root rsb's will be the basis of most of the recovery 66 * routines. 67 */ 68 69 dlm_create_root_list(ls); 70 71 /* 72 * Add or remove nodes from the lockspace's ls_nodes list. 73 */ 74 75 error = dlm_recover_members(ls, rv, &neg); 76 if (error) { 77 log_rinfo(ls, "dlm_recover_members error %d", error); 78 goto fail; 79 } 80 81 dlm_recover_dir_nodeid(ls); 82 83 ls->ls_recover_dir_sent_res = 0; 84 ls->ls_recover_dir_sent_msg = 0; 85 ls->ls_recover_locks_in = 0; 86 87 dlm_set_recover_status(ls, DLM_RS_NODES); 88 89 error = dlm_recover_members_wait(ls); 90 if (error) { 91 log_rinfo(ls, "dlm_recover_members_wait error %d", error); 92 goto fail; 93 } 94 95 start = jiffies; 96 97 /* 98 * Rebuild our own share of the directory by collecting from all other 99 * nodes their master rsb names that hash to us. 100 */ 101 102 error = dlm_recover_directory(ls); 103 if (error) { 104 log_rinfo(ls, "dlm_recover_directory error %d", error); 105 goto fail; 106 } 107 108 dlm_set_recover_status(ls, DLM_RS_DIR); 109 110 error = dlm_recover_directory_wait(ls); 111 if (error) { 112 log_rinfo(ls, "dlm_recover_directory_wait error %d", error); 113 goto fail; 114 } 115 116 log_rinfo(ls, "dlm_recover_directory %u out %u messages", 117 ls->ls_recover_dir_sent_res, ls->ls_recover_dir_sent_msg); 118 119 /* 120 * We may have outstanding operations that are waiting for a reply from 121 * a failed node. Mark these to be resent after recovery. Unlock and 122 * cancel ops can just be completed. 123 */ 124 125 dlm_recover_waiters_pre(ls); 126 127 if (dlm_recovery_stopped(ls)) { 128 error = -EINTR; 129 goto fail; 130 } 131 132 if (neg || dlm_no_directory(ls)) { 133 /* 134 * Clear lkb's for departed nodes. 135 */ 136 137 dlm_recover_purge(ls); 138 139 /* 140 * Get new master nodeid's for rsb's that were mastered on 141 * departed nodes. 142 */ 143 144 error = dlm_recover_masters(ls); 145 if (error) { 146 log_rinfo(ls, "dlm_recover_masters error %d", error); 147 goto fail; 148 } 149 150 /* 151 * Send our locks on remastered rsb's to the new masters. 152 */ 153 154 error = dlm_recover_locks(ls); 155 if (error) { 156 log_rinfo(ls, "dlm_recover_locks error %d", error); 157 goto fail; 158 } 159 160 dlm_set_recover_status(ls, DLM_RS_LOCKS); 161 162 error = dlm_recover_locks_wait(ls); 163 if (error) { 164 log_rinfo(ls, "dlm_recover_locks_wait error %d", error); 165 goto fail; 166 } 167 168 log_rinfo(ls, "dlm_recover_locks %u in", 169 ls->ls_recover_locks_in); 170 171 /* 172 * Finalize state in master rsb's now that all locks can be 173 * checked. This includes conversion resolution and lvb 174 * settings. 175 */ 176 177 dlm_recover_rsbs(ls); 178 } else { 179 /* 180 * Other lockspace members may be going through the "neg" steps 181 * while also adding us to the lockspace, in which case they'll 182 * be doing the recover_locks (RS_LOCKS) barrier. 183 */ 184 dlm_set_recover_status(ls, DLM_RS_LOCKS); 185 186 error = dlm_recover_locks_wait(ls); 187 if (error) { 188 log_rinfo(ls, "dlm_recover_locks_wait error %d", error); 189 goto fail; 190 } 191 } 192 193 dlm_release_root_list(ls); 194 195 /* 196 * Purge directory-related requests that are saved in requestqueue. 197 * All dir requests from before recovery are invalid now due to the dir 198 * rebuild and will be resent by the requesting nodes. 199 */ 200 201 dlm_purge_requestqueue(ls); 202 203 dlm_set_recover_status(ls, DLM_RS_DONE); 204 205 error = dlm_recover_done_wait(ls); 206 if (error) { 207 log_rinfo(ls, "dlm_recover_done_wait error %d", error); 208 goto fail; 209 } 210 211 dlm_clear_members_gone(ls); 212 213 dlm_adjust_timeouts(ls); 214 215 dlm_callback_resume(ls); 216 217 error = enable_locking(ls, rv->seq); 218 if (error) { 219 log_rinfo(ls, "enable_locking error %d", error); 220 goto fail; 221 } 222 223 error = dlm_process_requestqueue(ls); 224 if (error) { 225 log_rinfo(ls, "dlm_process_requestqueue error %d", error); 226 goto fail; 227 } 228 229 error = dlm_recover_waiters_post(ls); 230 if (error) { 231 log_rinfo(ls, "dlm_recover_waiters_post error %d", error); 232 goto fail; 233 } 234 235 dlm_recover_grant(ls); 236 237 log_rinfo(ls, "dlm_recover %llu generation %u done: %u ms", 238 (unsigned long long)rv->seq, ls->ls_generation, 239 jiffies_to_msecs(jiffies - start)); 240 mutex_unlock(&ls->ls_recoverd_active); 241 242 dlm_lsop_recover_done(ls); 243 return 0; 244 245 fail: 246 dlm_release_root_list(ls); 247 log_rinfo(ls, "dlm_recover %llu error %d", 248 (unsigned long long)rv->seq, error); 249 mutex_unlock(&ls->ls_recoverd_active); 250 return error; 251 } 252 253 /* The dlm_ls_start() that created the rv we take here may already have been 254 stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP 255 flag set. */ 256 257 static void do_ls_recovery(struct dlm_ls *ls) 258 { 259 struct dlm_recover *rv = NULL; 260 261 spin_lock(&ls->ls_recover_lock); 262 rv = ls->ls_recover_args; 263 ls->ls_recover_args = NULL; 264 if (rv && ls->ls_recover_seq == rv->seq) 265 clear_bit(LSFL_RECOVER_STOP, &ls->ls_flags); 266 spin_unlock(&ls->ls_recover_lock); 267 268 if (rv) { 269 ls_recover(ls, rv); 270 kfree(rv->nodes); 271 kfree(rv); 272 } 273 } 274 275 static int dlm_recoverd(void *arg) 276 { 277 struct dlm_ls *ls; 278 279 ls = dlm_find_lockspace_local(arg); 280 if (!ls) { 281 log_print("dlm_recoverd: no lockspace %p", arg); 282 return -1; 283 } 284 285 down_write(&ls->ls_in_recovery); 286 set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags); 287 wake_up(&ls->ls_recover_lock_wait); 288 289 while (1) { 290 /* 291 * We call kthread_should_stop() after set_current_state(). 292 * This is because it works correctly if kthread_stop() is 293 * called just before set_current_state(). 294 */ 295 set_current_state(TASK_INTERRUPTIBLE); 296 if (kthread_should_stop()) { 297 set_current_state(TASK_RUNNING); 298 break; 299 } 300 if (!test_bit(LSFL_RECOVER_WORK, &ls->ls_flags) && 301 !test_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) { 302 if (kthread_should_stop()) 303 break; 304 schedule(); 305 } 306 set_current_state(TASK_RUNNING); 307 308 if (test_and_clear_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) { 309 down_write(&ls->ls_in_recovery); 310 set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags); 311 wake_up(&ls->ls_recover_lock_wait); 312 } 313 314 if (test_and_clear_bit(LSFL_RECOVER_WORK, &ls->ls_flags)) 315 do_ls_recovery(ls); 316 } 317 318 if (test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags)) 319 up_write(&ls->ls_in_recovery); 320 321 dlm_put_lockspace(ls); 322 return 0; 323 } 324 325 int dlm_recoverd_start(struct dlm_ls *ls) 326 { 327 struct task_struct *p; 328 int error = 0; 329 330 p = kthread_run(dlm_recoverd, ls, "dlm_recoverd"); 331 if (IS_ERR(p)) 332 error = PTR_ERR(p); 333 else 334 ls->ls_recoverd_task = p; 335 return error; 336 } 337 338 void dlm_recoverd_stop(struct dlm_ls *ls) 339 { 340 kthread_stop(ls->ls_recoverd_task); 341 } 342 343 void dlm_recoverd_suspend(struct dlm_ls *ls) 344 { 345 wake_up(&ls->ls_wait_general); 346 mutex_lock(&ls->ls_recoverd_active); 347 } 348 349 void dlm_recoverd_resume(struct dlm_ls *ls) 350 { 351 mutex_unlock(&ls->ls_recoverd_active); 352 } 353 354