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"requestqueue.h" 21#include "recoverd.h" 22 23 24/* If the start for which we're re-enabling locking (seq) has been superseded 25 by a newer stop (ls_recover_seq), we need to leave locking disabled. 26 27 We suspend dlm_recv threads here to avoid the race where dlm_recv a) sees 28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 31static 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 51static 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 error = dlm_recovery_stopped(ls); 128 if (error) 129 goto fail; 130 131 if (neg || dlm_no_directory(ls)) { 132 /* 133 * Clear lkb's for departed nodes. 134 */ 135 136 dlm_recover_purge(ls); 137 138 /* 139 * Get new master nodeid's for rsb's that were mastered on 140 * departed nodes. 141 */ 142 143 error = dlm_recover_masters(ls); 144 if (error) { 145 log_rinfo(ls, "dlm_recover_masters error %d", error); 146 goto fail; 147 } 148 149 /* 150 * Send our locks on remastered rsb's to the new masters. 151 */ 152 153 error = dlm_recover_locks(ls); 154 if (error) { 155 log_rinfo(ls, "dlm_recover_locks error %d", error); 156 goto fail; 157 } 158 159 dlm_set_recover_status(ls, DLM_RS_LOCKS); 160 161 error = dlm_recover_locks_wait(ls); 162 if (error) { 163 log_rinfo(ls, "dlm_recover_locks_wait error %d", error); 164 goto fail; 165 } 166 167 log_rinfo(ls, "dlm_recover_locks %u in", 168 ls->ls_recover_locks_in); 169 170 /* 171 * Finalize state in master rsb's now that all locks can be 172 * checked. This includes conversion resolution and lvb 173 * settings. 174 */ 175 176 dlm_recover_rsbs(ls); 177 } else { 178 /* 179 * Other lockspace members may be going through the "neg" steps 180 * while also adding us to the lockspace, in which case they'll 181 * be doing the recover_locks (RS_LOCKS) barrier. 182 */ 183 dlm_set_recover_status(ls, DLM_RS_LOCKS); 184 185 error = dlm_recover_locks_wait(ls); 186 if (error) { 187 log_rinfo(ls, "dlm_recover_locks_wait error %d", error); 188 goto fail; 189 } 190 } 191 192 dlm_release_root_list(ls); 193 194 /* 195 * Purge directory-related requests that are saved in requestqueue. 196 * All dir requests from before recovery are invalid now due to the dir 197 * rebuild and will be resent by the requesting nodes. 198 */ 199 200 dlm_purge_requestqueue(ls); 201 202 dlm_set_recover_status(ls, DLM_RS_DONE); 203 204 error = dlm_recover_done_wait(ls); 205 if (error) { 206 log_rinfo(ls, "dlm_recover_done_wait error %d", error); 207 goto fail; 208 } 209 210 dlm_clear_members_gone(ls); 211 212 dlm_adjust_timeouts(ls); 213 214 dlm_callback_resume(ls); 215 216 error = enable_locking(ls, rv->seq); 217 if (error) { 218 log_rinfo(ls, "enable_locking error %d", error); 219 goto fail; 220 } 221 222 error = dlm_process_requestqueue(ls); 223 if (error) { 224 log_rinfo(ls, "dlm_process_requestqueue error %d", error); 225 goto fail; 226 } 227 228 error = dlm_recover_waiters_post(ls); 229 if (error) { 230 log_rinfo(ls, "dlm_recover_waiters_post error %d", error); 231 goto fail; 232 } 233 234 dlm_recover_grant(ls); 235 236 log_rinfo(ls, "dlm_recover %llu generation %u done: %u ms", 237 (unsigned long long)rv->seq, ls->ls_generation, 238 jiffies_to_msecs(jiffies - start)); 239 mutex_unlock(&ls->ls_recoverd_active); 240 241 dlm_lsop_recover_done(ls); 242 return 0; 243 244 fail: 245 dlm_release_root_list(ls); 246 log_rinfo(ls, "dlm_recover %llu error %d", 247 (unsigned long long)rv->seq, error); 248 mutex_unlock(&ls->ls_recoverd_active); 249 return error; 250} 251 252/* The dlm_ls_start() that created the rv we take here may already have been 253 stopped via dlm_ls_stop(); in that case we need to leave the RECOVERY_STOP 254 flag set. */ 255 256static void do_ls_recovery(struct dlm_ls *ls) 257{ 258 struct dlm_recover *rv = NULL; 259 260 spin_lock(&ls->ls_recover_lock); 261 rv = ls->ls_recover_args; 262 ls->ls_recover_args = NULL; 263 if (rv && ls->ls_recover_seq == rv->seq) 264 clear_bit(LSFL_RECOVER_STOP, &ls->ls_flags); 265 spin_unlock(&ls->ls_recover_lock); 266 267 if (rv) { 268 ls_recover(ls, rv); 269 kfree(rv->nodes); 270 kfree(rv); 271 } 272} 273 274static int dlm_recoverd(void *arg) 275{ 276 struct dlm_ls *ls; 277 278 ls = dlm_find_lockspace_local(arg); 279 if (!ls) { 280 log_print("dlm_recoverd: no lockspace %p", arg); 281 return -1; 282 } 283 284 down_write(&ls->ls_in_recovery); 285 set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags); 286 wake_up(&ls->ls_recover_lock_wait); 287 288 while (1) { 289 /* 290 * We call kthread_should_stop() after set_current_state(). 291 * This is because it works correctly if kthread_stop() is 292 * called just before set_current_state(). 293 */ 294 set_current_state(TASK_INTERRUPTIBLE); 295 if (kthread_should_stop()) { 296 set_current_state(TASK_RUNNING); 297 break; 298 } 299 if (!test_bit(LSFL_RECOVER_WORK, &ls->ls_flags) && 300 !test_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) { 301 if (kthread_should_stop()) 302 break; 303 schedule(); 304 } 305 set_current_state(TASK_RUNNING); 306 307 if (test_and_clear_bit(LSFL_RECOVER_DOWN, &ls->ls_flags)) { 308 down_write(&ls->ls_in_recovery); 309 set_bit(LSFL_RECOVER_LOCK, &ls->ls_flags); 310 wake_up(&ls->ls_recover_lock_wait); 311 } 312 313 if (test_and_clear_bit(LSFL_RECOVER_WORK, &ls->ls_flags)) 314 do_ls_recovery(ls); 315 } 316 317 if (test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags)) 318 up_write(&ls->ls_in_recovery); 319 320 dlm_put_lockspace(ls); 321 return 0; 322} 323 324int dlm_recoverd_start(struct dlm_ls *ls) 325{ 326 struct task_struct *p; 327 int error = 0; 328 329 p = kthread_run(dlm_recoverd, ls, "dlm_recoverd"); 330 if (IS_ERR(p)) 331 error = PTR_ERR(p); 332 else 333 ls->ls_recoverd_task = p; 334 return error; 335} 336 337void dlm_recoverd_stop(struct dlm_ls *ls) 338{ 339 kthread_stop(ls->ls_recoverd_task); 340} 341 342void dlm_recoverd_suspend(struct dlm_ls *ls) 343{ 344 wake_up(&ls->ls_wait_general); 345 mutex_lock(&ls->ls_recoverd_active); 346} 347 348void dlm_recoverd_resume(struct dlm_ls *ls) 349{ 350 mutex_unlock(&ls->ls_recoverd_active); 351} 352 353