| 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) 2005-2008 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 "lowcomms.h" |
| 16 | #include "midcomms.h" |
| 17 | #include "rcom.h" |
| 18 | #include "recover.h" |
| 19 | #include "dir.h" |
| 20 | #include "config.h" |
| 21 | #include "memory.h" |
| 22 | #include "lock.h" |
| 23 | #include "util.h" |
| 24 | |
| 25 | static int rcom_response(struct dlm_ls *ls) |
| 26 | { |
| 27 | return test_bit(LSFL_RCOM_READY, &ls->ls_flags); |
| 28 | } |
| 29 | |
| 30 | static void _create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len, |
| 31 | struct dlm_rcom **rc_ret, char *mb, int mb_len) |
| 32 | { |
| 33 | struct dlm_rcom *rc; |
| 34 | |
| 35 | rc = (struct dlm_rcom *) mb; |
| 36 | |
| 37 | rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR); |
| 38 | rc->rc_header.u.h_lockspace = ls->ls_global_id; |
| 39 | rc->rc_header.h_nodeid = dlm_our_nodeid(); |
| 40 | rc->rc_header.h_length = mb_len; |
| 41 | rc->rc_header.h_cmd = DLM_RCOM; |
| 42 | |
| 43 | rc->rc_type = type; |
| 44 | |
| 45 | spin_lock(&ls->ls_recover_lock); |
| 46 | rc->rc_seq = ls->ls_recover_seq; |
| 47 | spin_unlock(&ls->ls_recover_lock); |
| 48 | |
| 49 | *rc_ret = rc; |
| 50 | } |
| 51 | |
| 52 | static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len, |
| 53 | struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret) |
| 54 | { |
| 55 | int mb_len = sizeof(struct dlm_rcom) + len; |
| 56 | struct dlm_mhandle *mh; |
| 57 | char *mb; |
| 58 | |
| 59 | mh = dlm_midcomms_get_mhandle(to_nodeid, mb_len, GFP_NOFS, &mb); |
| 60 | if (!mh) { |
| 61 | log_print("%s to %d type %d len %d ENOBUFS", |
| 62 | __func__, to_nodeid, type, len); |
| 63 | return -ENOBUFS; |
| 64 | } |
| 65 | |
| 66 | _create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len); |
| 67 | *mh_ret = mh; |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static int create_rcom_stateless(struct dlm_ls *ls, int to_nodeid, int type, |
| 72 | int len, struct dlm_rcom **rc_ret, |
| 73 | struct dlm_msg **msg_ret) |
| 74 | { |
| 75 | int mb_len = sizeof(struct dlm_rcom) + len; |
| 76 | struct dlm_msg *msg; |
| 77 | char *mb; |
| 78 | |
| 79 | msg = dlm_lowcomms_new_msg(to_nodeid, mb_len, GFP_NOFS, &mb, |
| 80 | NULL, NULL); |
| 81 | if (!msg) { |
| 82 | log_print("create_rcom to %d type %d len %d ENOBUFS", |
| 83 | to_nodeid, type, len); |
| 84 | return -ENOBUFS; |
| 85 | } |
| 86 | |
| 87 | _create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len); |
| 88 | *msg_ret = msg; |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | static void _send_rcom(struct dlm_ls *ls, struct dlm_rcom *rc) |
| 93 | { |
| 94 | dlm_rcom_out(rc); |
| 95 | } |
| 96 | |
| 97 | static void send_rcom(struct dlm_ls *ls, struct dlm_mhandle *mh, |
| 98 | struct dlm_rcom *rc) |
| 99 | { |
| 100 | _send_rcom(ls, rc); |
| 101 | dlm_midcomms_commit_mhandle(mh); |
| 102 | } |
| 103 | |
| 104 | static void send_rcom_stateless(struct dlm_ls *ls, struct dlm_msg *msg, |
| 105 | struct dlm_rcom *rc) |
| 106 | { |
| 107 | _send_rcom(ls, rc); |
| 108 | dlm_lowcomms_commit_msg(msg); |
| 109 | dlm_lowcomms_put_msg(msg); |
| 110 | } |
| 111 | |
| 112 | static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs, |
| 113 | uint32_t flags) |
| 114 | { |
| 115 | rs->rs_flags = cpu_to_le32(flags); |
| 116 | } |
| 117 | |
| 118 | /* When replying to a status request, a node also sends back its |
| 119 | configuration values. The requesting node then checks that the remote |
| 120 | node is configured the same way as itself. */ |
| 121 | |
| 122 | static void set_rcom_config(struct dlm_ls *ls, struct rcom_config *rf, |
| 123 | uint32_t num_slots) |
| 124 | { |
| 125 | rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen); |
| 126 | rf->rf_lsflags = cpu_to_le32(ls->ls_exflags); |
| 127 | |
| 128 | rf->rf_our_slot = cpu_to_le16(ls->ls_slot); |
| 129 | rf->rf_num_slots = cpu_to_le16(num_slots); |
| 130 | rf->rf_generation = cpu_to_le32(ls->ls_generation); |
| 131 | } |
| 132 | |
| 133 | static int check_rcom_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) |
| 134 | { |
| 135 | struct rcom_config *rf = (struct rcom_config *) rc->rc_buf; |
| 136 | |
| 137 | if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) { |
| 138 | log_error(ls, "version mismatch: %x nodeid %d: %x", |
| 139 | DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid, |
| 140 | rc->rc_header.h_version); |
| 141 | return -EPROTO; |
| 142 | } |
| 143 | |
| 144 | if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen || |
| 145 | le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) { |
| 146 | log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x", |
| 147 | ls->ls_lvblen, ls->ls_exflags, nodeid, |
| 148 | le32_to_cpu(rf->rf_lvblen), |
| 149 | le32_to_cpu(rf->rf_lsflags)); |
| 150 | return -EPROTO; |
| 151 | } |
| 152 | return 0; |
| 153 | } |
| 154 | |
| 155 | static void allow_sync_reply(struct dlm_ls *ls, uint64_t *new_seq) |
| 156 | { |
| 157 | spin_lock(&ls->ls_rcom_spin); |
| 158 | *new_seq = ++ls->ls_rcom_seq; |
| 159 | set_bit(LSFL_RCOM_WAIT, &ls->ls_flags); |
| 160 | spin_unlock(&ls->ls_rcom_spin); |
| 161 | } |
| 162 | |
| 163 | static void disallow_sync_reply(struct dlm_ls *ls) |
| 164 | { |
| 165 | spin_lock(&ls->ls_rcom_spin); |
| 166 | clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags); |
| 167 | clear_bit(LSFL_RCOM_READY, &ls->ls_flags); |
| 168 | spin_unlock(&ls->ls_rcom_spin); |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * low nodeid gathers one slot value at a time from each node. |
| 173 | * it sets need_slots=0, and saves rf_our_slot returned from each |
| 174 | * rcom_config. |
| 175 | * |
| 176 | * other nodes gather all slot values at once from the low nodeid. |
| 177 | * they set need_slots=1, and ignore the rf_our_slot returned from each |
| 178 | * rcom_config. they use the rf_num_slots returned from the low |
| 179 | * node's rcom_config. |
| 180 | */ |
| 181 | |
| 182 | int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags) |
| 183 | { |
| 184 | struct dlm_rcom *rc; |
| 185 | struct dlm_msg *msg; |
| 186 | int error = 0; |
| 187 | |
| 188 | ls->ls_recover_nodeid = nodeid; |
| 189 | |
| 190 | if (nodeid == dlm_our_nodeid()) { |
| 191 | rc = ls->ls_recover_buf; |
| 192 | rc->rc_result = dlm_recover_status(ls); |
| 193 | goto out; |
| 194 | } |
| 195 | |
| 196 | retry: |
| 197 | error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS, |
| 198 | sizeof(struct rcom_status), &rc, &msg); |
| 199 | if (error) |
| 200 | goto out; |
| 201 | |
| 202 | set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags); |
| 203 | |
| 204 | allow_sync_reply(ls, &rc->rc_id); |
| 205 | memset(ls->ls_recover_buf, 0, DEFAULT_BUFFER_SIZE); |
| 206 | |
| 207 | send_rcom_stateless(ls, msg, rc); |
| 208 | |
| 209 | error = dlm_wait_function(ls, &rcom_response); |
| 210 | disallow_sync_reply(ls); |
| 211 | if (error == -ETIMEDOUT) |
| 212 | goto retry; |
| 213 | if (error) |
| 214 | goto out; |
| 215 | |
| 216 | rc = ls->ls_recover_buf; |
| 217 | |
| 218 | if (rc->rc_result == -ESRCH) { |
| 219 | /* we pretend the remote lockspace exists with 0 status */ |
| 220 | log_debug(ls, "remote node %d not ready", nodeid); |
| 221 | rc->rc_result = 0; |
| 222 | error = 0; |
| 223 | } else { |
| 224 | error = check_rcom_config(ls, rc, nodeid); |
| 225 | } |
| 226 | |
| 227 | /* the caller looks at rc_result for the remote recovery status */ |
| 228 | out: |
| 229 | return error; |
| 230 | } |
| 231 | |
| 232 | static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
| 233 | { |
| 234 | struct dlm_rcom *rc; |
| 235 | struct rcom_status *rs; |
| 236 | uint32_t status; |
| 237 | int nodeid = rc_in->rc_header.h_nodeid; |
| 238 | int len = sizeof(struct rcom_config); |
| 239 | struct dlm_msg *msg; |
| 240 | int num_slots = 0; |
| 241 | int error; |
| 242 | |
| 243 | if (!dlm_slots_version(&rc_in->rc_header)) { |
| 244 | status = dlm_recover_status(ls); |
| 245 | goto do_create; |
| 246 | } |
| 247 | |
| 248 | rs = (struct rcom_status *)rc_in->rc_buf; |
| 249 | |
| 250 | if (!(le32_to_cpu(rs->rs_flags) & DLM_RSF_NEED_SLOTS)) { |
| 251 | status = dlm_recover_status(ls); |
| 252 | goto do_create; |
| 253 | } |
| 254 | |
| 255 | spin_lock(&ls->ls_recover_lock); |
| 256 | status = ls->ls_recover_status; |
| 257 | num_slots = ls->ls_num_slots; |
| 258 | spin_unlock(&ls->ls_recover_lock); |
| 259 | len += num_slots * sizeof(struct rcom_slot); |
| 260 | |
| 261 | do_create: |
| 262 | error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS_REPLY, |
| 263 | len, &rc, &msg); |
| 264 | if (error) |
| 265 | return; |
| 266 | |
| 267 | rc->rc_id = rc_in->rc_id; |
| 268 | rc->rc_seq_reply = rc_in->rc_seq; |
| 269 | rc->rc_result = status; |
| 270 | |
| 271 | set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, num_slots); |
| 272 | |
| 273 | if (!num_slots) |
| 274 | goto do_send; |
| 275 | |
| 276 | spin_lock(&ls->ls_recover_lock); |
| 277 | if (ls->ls_num_slots != num_slots) { |
| 278 | spin_unlock(&ls->ls_recover_lock); |
| 279 | log_debug(ls, "receive_rcom_status num_slots %d to %d", |
| 280 | num_slots, ls->ls_num_slots); |
| 281 | rc->rc_result = 0; |
| 282 | set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, 0); |
| 283 | goto do_send; |
| 284 | } |
| 285 | |
| 286 | dlm_slots_copy_out(ls, rc); |
| 287 | spin_unlock(&ls->ls_recover_lock); |
| 288 | |
| 289 | do_send: |
| 290 | send_rcom_stateless(ls, msg, rc); |
| 291 | } |
| 292 | |
| 293 | static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
| 294 | { |
| 295 | spin_lock(&ls->ls_rcom_spin); |
| 296 | if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) || |
| 297 | rc_in->rc_id != ls->ls_rcom_seq) { |
| 298 | log_debug(ls, "reject reply %d from %d seq %llx expect %llx", |
| 299 | rc_in->rc_type, rc_in->rc_header.h_nodeid, |
| 300 | (unsigned long long)rc_in->rc_id, |
| 301 | (unsigned long long)ls->ls_rcom_seq); |
| 302 | goto out; |
| 303 | } |
| 304 | memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length); |
| 305 | set_bit(LSFL_RCOM_READY, &ls->ls_flags); |
| 306 | clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags); |
| 307 | wake_up(&ls->ls_wait_general); |
| 308 | out: |
| 309 | spin_unlock(&ls->ls_rcom_spin); |
| 310 | } |
| 311 | |
| 312 | int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len) |
| 313 | { |
| 314 | struct dlm_rcom *rc; |
| 315 | struct dlm_msg *msg; |
| 316 | int error = 0; |
| 317 | |
| 318 | ls->ls_recover_nodeid = nodeid; |
| 319 | |
| 320 | retry: |
| 321 | error = create_rcom_stateless(ls, nodeid, DLM_RCOM_NAMES, last_len, |
| 322 | &rc, &msg); |
| 323 | if (error) |
| 324 | goto out; |
| 325 | memcpy(rc->rc_buf, last_name, last_len); |
| 326 | |
| 327 | allow_sync_reply(ls, &rc->rc_id); |
| 328 | memset(ls->ls_recover_buf, 0, DEFAULT_BUFFER_SIZE); |
| 329 | |
| 330 | send_rcom_stateless(ls, msg, rc); |
| 331 | |
| 332 | error = dlm_wait_function(ls, &rcom_response); |
| 333 | disallow_sync_reply(ls); |
| 334 | if (error == -ETIMEDOUT) |
| 335 | goto retry; |
| 336 | out: |
| 337 | return error; |
| 338 | } |
| 339 | |
| 340 | static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
| 341 | { |
| 342 | struct dlm_rcom *rc; |
| 343 | int error, inlen, outlen, nodeid; |
| 344 | struct dlm_msg *msg; |
| 345 | |
| 346 | nodeid = rc_in->rc_header.h_nodeid; |
| 347 | inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom); |
| 348 | outlen = LOWCOMMS_MAX_TX_BUFFER_LEN - sizeof(struct dlm_rcom); |
| 349 | |
| 350 | error = create_rcom_stateless(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, |
| 351 | &rc, &msg); |
| 352 | if (error) |
| 353 | return; |
| 354 | rc->rc_id = rc_in->rc_id; |
| 355 | rc->rc_seq_reply = rc_in->rc_seq; |
| 356 | |
| 357 | dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen, |
| 358 | nodeid); |
| 359 | send_rcom_stateless(ls, msg, rc); |
| 360 | } |
| 361 | |
| 362 | int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid) |
| 363 | { |
| 364 | struct dlm_rcom *rc; |
| 365 | struct dlm_mhandle *mh; |
| 366 | struct dlm_ls *ls = r->res_ls; |
| 367 | int error; |
| 368 | |
| 369 | error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length, |
| 370 | &rc, &mh); |
| 371 | if (error) |
| 372 | goto out; |
| 373 | memcpy(rc->rc_buf, r->res_name, r->res_length); |
| 374 | rc->rc_id = (unsigned long) r->res_id; |
| 375 | |
| 376 | send_rcom(ls, mh, rc); |
| 377 | out: |
| 378 | return error; |
| 379 | } |
| 380 | |
| 381 | static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
| 382 | { |
| 383 | struct dlm_rcom *rc; |
| 384 | struct dlm_mhandle *mh; |
| 385 | int error, ret_nodeid, nodeid = rc_in->rc_header.h_nodeid; |
| 386 | int len = rc_in->rc_header.h_length - sizeof(struct dlm_rcom); |
| 387 | |
| 388 | error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh); |
| 389 | if (error) |
| 390 | return; |
| 391 | |
| 392 | /* Old code would send this special id to trigger a debug dump. */ |
| 393 | if (rc_in->rc_id == 0xFFFFFFFF) { |
| 394 | log_error(ls, "receive_rcom_lookup dump from %d", nodeid); |
| 395 | dlm_dump_rsb_name(ls, rc_in->rc_buf, len); |
| 396 | return; |
| 397 | } |
| 398 | |
| 399 | error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len, |
| 400 | DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL); |
| 401 | if (error) |
| 402 | ret_nodeid = error; |
| 403 | rc->rc_result = ret_nodeid; |
| 404 | rc->rc_id = rc_in->rc_id; |
| 405 | rc->rc_seq_reply = rc_in->rc_seq; |
| 406 | |
| 407 | send_rcom(ls, mh, rc); |
| 408 | } |
| 409 | |
| 410 | static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
| 411 | { |
| 412 | dlm_recover_master_reply(ls, rc_in); |
| 413 | } |
| 414 | |
| 415 | static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb, |
| 416 | struct rcom_lock *rl) |
| 417 | { |
| 418 | memset(rl, 0, sizeof(*rl)); |
| 419 | |
| 420 | rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid); |
| 421 | rl->rl_lkid = cpu_to_le32(lkb->lkb_id); |
| 422 | rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags); |
| 423 | rl->rl_flags = cpu_to_le32(lkb->lkb_flags); |
| 424 | rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq); |
| 425 | rl->rl_rqmode = lkb->lkb_rqmode; |
| 426 | rl->rl_grmode = lkb->lkb_grmode; |
| 427 | rl->rl_status = lkb->lkb_status; |
| 428 | rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type); |
| 429 | |
| 430 | if (lkb->lkb_bastfn) |
| 431 | rl->rl_asts |= DLM_CB_BAST; |
| 432 | if (lkb->lkb_astfn) |
| 433 | rl->rl_asts |= DLM_CB_CAST; |
| 434 | |
| 435 | rl->rl_namelen = cpu_to_le16(r->res_length); |
| 436 | memcpy(rl->rl_name, r->res_name, r->res_length); |
| 437 | |
| 438 | /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ? |
| 439 | If so, receive_rcom_lock_args() won't take this copy. */ |
| 440 | |
| 441 | if (lkb->lkb_lvbptr) |
| 442 | memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen); |
| 443 | } |
| 444 | |
| 445 | int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) |
| 446 | { |
| 447 | struct dlm_ls *ls = r->res_ls; |
| 448 | struct dlm_rcom *rc; |
| 449 | struct dlm_mhandle *mh; |
| 450 | struct rcom_lock *rl; |
| 451 | int error, len = sizeof(struct rcom_lock); |
| 452 | |
| 453 | if (lkb->lkb_lvbptr) |
| 454 | len += ls->ls_lvblen; |
| 455 | |
| 456 | error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh); |
| 457 | if (error) |
| 458 | goto out; |
| 459 | |
| 460 | rl = (struct rcom_lock *) rc->rc_buf; |
| 461 | pack_rcom_lock(r, lkb, rl); |
| 462 | rc->rc_id = (unsigned long) r; |
| 463 | |
| 464 | send_rcom(ls, mh, rc); |
| 465 | out: |
| 466 | return error; |
| 467 | } |
| 468 | |
| 469 | /* needs at least dlm_rcom + rcom_lock */ |
| 470 | static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
| 471 | { |
| 472 | struct dlm_rcom *rc; |
| 473 | struct dlm_mhandle *mh; |
| 474 | int error, nodeid = rc_in->rc_header.h_nodeid; |
| 475 | |
| 476 | dlm_recover_master_copy(ls, rc_in); |
| 477 | |
| 478 | error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY, |
| 479 | sizeof(struct rcom_lock), &rc, &mh); |
| 480 | if (error) |
| 481 | return; |
| 482 | |
| 483 | /* We send back the same rcom_lock struct we received, but |
| 484 | dlm_recover_master_copy() has filled in rl_remid and rl_result */ |
| 485 | |
| 486 | memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock)); |
| 487 | rc->rc_id = rc_in->rc_id; |
| 488 | rc->rc_seq_reply = rc_in->rc_seq; |
| 489 | |
| 490 | send_rcom(ls, mh, rc); |
| 491 | } |
| 492 | |
| 493 | /* If the lockspace doesn't exist then still send a status message |
| 494 | back; it's possible that it just doesn't have its global_id yet. */ |
| 495 | |
| 496 | int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in) |
| 497 | { |
| 498 | struct dlm_rcom *rc; |
| 499 | struct rcom_config *rf; |
| 500 | struct dlm_mhandle *mh; |
| 501 | char *mb; |
| 502 | int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config); |
| 503 | |
| 504 | mh = dlm_midcomms_get_mhandle(nodeid, mb_len, GFP_NOFS, &mb); |
| 505 | if (!mh) |
| 506 | return -ENOBUFS; |
| 507 | |
| 508 | rc = (struct dlm_rcom *) mb; |
| 509 | |
| 510 | rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR); |
| 511 | rc->rc_header.u.h_lockspace = rc_in->rc_header.u.h_lockspace; |
| 512 | rc->rc_header.h_nodeid = dlm_our_nodeid(); |
| 513 | rc->rc_header.h_length = mb_len; |
| 514 | rc->rc_header.h_cmd = DLM_RCOM; |
| 515 | |
| 516 | rc->rc_type = DLM_RCOM_STATUS_REPLY; |
| 517 | rc->rc_id = rc_in->rc_id; |
| 518 | rc->rc_seq_reply = rc_in->rc_seq; |
| 519 | rc->rc_result = -ESRCH; |
| 520 | |
| 521 | rf = (struct rcom_config *) rc->rc_buf; |
| 522 | rf->rf_lvblen = cpu_to_le32(~0U); |
| 523 | |
| 524 | dlm_rcom_out(rc); |
| 525 | dlm_midcomms_commit_mhandle(mh); |
| 526 | |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | * Ignore messages for stage Y before we set |
| 532 | * recover_status bit for stage X: |
| 533 | * |
| 534 | * recover_status = 0 |
| 535 | * |
| 536 | * dlm_recover_members() |
| 537 | * - send nothing |
| 538 | * - recv nothing |
| 539 | * - ignore NAMES, NAMES_REPLY |
| 540 | * - ignore LOOKUP, LOOKUP_REPLY |
| 541 | * - ignore LOCK, LOCK_REPLY |
| 542 | * |
| 543 | * recover_status |= NODES |
| 544 | * |
| 545 | * dlm_recover_members_wait() |
| 546 | * |
| 547 | * dlm_recover_directory() |
| 548 | * - send NAMES |
| 549 | * - recv NAMES_REPLY |
| 550 | * - ignore LOOKUP, LOOKUP_REPLY |
| 551 | * - ignore LOCK, LOCK_REPLY |
| 552 | * |
| 553 | * recover_status |= DIR |
| 554 | * |
| 555 | * dlm_recover_directory_wait() |
| 556 | * |
| 557 | * dlm_recover_masters() |
| 558 | * - send LOOKUP |
| 559 | * - recv LOOKUP_REPLY |
| 560 | * |
| 561 | * dlm_recover_locks() |
| 562 | * - send LOCKS |
| 563 | * - recv LOCKS_REPLY |
| 564 | * |
| 565 | * recover_status |= LOCKS |
| 566 | * |
| 567 | * dlm_recover_locks_wait() |
| 568 | * |
| 569 | * recover_status |= DONE |
| 570 | */ |
| 571 | |
| 572 | /* Called by dlm_recv; corresponds to dlm_receive_message() but special |
| 573 | recovery-only comms are sent through here. */ |
| 574 | |
| 575 | void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) |
| 576 | { |
| 577 | int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock); |
| 578 | int stop, reply = 0, names = 0, lookup = 0, lock = 0; |
| 579 | uint32_t status; |
| 580 | uint64_t seq; |
| 581 | |
| 582 | switch (rc->rc_type) { |
| 583 | case DLM_RCOM_STATUS_REPLY: |
| 584 | reply = 1; |
| 585 | break; |
| 586 | case DLM_RCOM_NAMES: |
| 587 | names = 1; |
| 588 | break; |
| 589 | case DLM_RCOM_NAMES_REPLY: |
| 590 | names = 1; |
| 591 | reply = 1; |
| 592 | break; |
| 593 | case DLM_RCOM_LOOKUP: |
| 594 | lookup = 1; |
| 595 | break; |
| 596 | case DLM_RCOM_LOOKUP_REPLY: |
| 597 | lookup = 1; |
| 598 | reply = 1; |
| 599 | break; |
| 600 | case DLM_RCOM_LOCK: |
| 601 | lock = 1; |
| 602 | break; |
| 603 | case DLM_RCOM_LOCK_REPLY: |
| 604 | lock = 1; |
| 605 | reply = 1; |
| 606 | break; |
| 607 | } |
| 608 | |
| 609 | spin_lock(&ls->ls_recover_lock); |
| 610 | status = ls->ls_recover_status; |
| 611 | stop = test_bit(LSFL_RECOVER_STOP, &ls->ls_flags); |
| 612 | seq = ls->ls_recover_seq; |
| 613 | spin_unlock(&ls->ls_recover_lock); |
| 614 | |
| 615 | if (stop && (rc->rc_type != DLM_RCOM_STATUS)) |
| 616 | goto ignore; |
| 617 | |
| 618 | if (reply && (rc->rc_seq_reply != seq)) |
| 619 | goto ignore; |
| 620 | |
| 621 | if (!(status & DLM_RS_NODES) && (names || lookup || lock)) |
| 622 | goto ignore; |
| 623 | |
| 624 | if (!(status & DLM_RS_DIR) && (lookup || lock)) |
| 625 | goto ignore; |
| 626 | |
| 627 | switch (rc->rc_type) { |
| 628 | case DLM_RCOM_STATUS: |
| 629 | receive_rcom_status(ls, rc); |
| 630 | break; |
| 631 | |
| 632 | case DLM_RCOM_NAMES: |
| 633 | receive_rcom_names(ls, rc); |
| 634 | break; |
| 635 | |
| 636 | case DLM_RCOM_LOOKUP: |
| 637 | receive_rcom_lookup(ls, rc); |
| 638 | break; |
| 639 | |
| 640 | case DLM_RCOM_LOCK: |
| 641 | if (rc->rc_header.h_length < lock_size) |
| 642 | goto Eshort; |
| 643 | receive_rcom_lock(ls, rc); |
| 644 | break; |
| 645 | |
| 646 | case DLM_RCOM_STATUS_REPLY: |
| 647 | receive_sync_reply(ls, rc); |
| 648 | break; |
| 649 | |
| 650 | case DLM_RCOM_NAMES_REPLY: |
| 651 | receive_sync_reply(ls, rc); |
| 652 | break; |
| 653 | |
| 654 | case DLM_RCOM_LOOKUP_REPLY: |
| 655 | receive_rcom_lookup_reply(ls, rc); |
| 656 | break; |
| 657 | |
| 658 | case DLM_RCOM_LOCK_REPLY: |
| 659 | if (rc->rc_header.h_length < lock_size) |
| 660 | goto Eshort; |
| 661 | dlm_recover_process_copy(ls, rc); |
| 662 | break; |
| 663 | |
| 664 | default: |
| 665 | log_error(ls, "receive_rcom bad type %d", rc->rc_type); |
| 666 | } |
| 667 | return; |
| 668 | |
| 669 | ignore: |
| 670 | log_limit(ls, "dlm_receive_rcom ignore msg %d " |
| 671 | "from %d %llu %llu recover seq %llu sts %x gen %u", |
| 672 | rc->rc_type, |
| 673 | nodeid, |
| 674 | (unsigned long long)rc->rc_seq, |
| 675 | (unsigned long long)rc->rc_seq_reply, |
| 676 | (unsigned long long)seq, |
| 677 | status, ls->ls_generation); |
| 678 | return; |
| 679 | Eshort: |
| 680 | log_error(ls, "recovery message %d from %d is too short", |
| 681 | rc->rc_type, nodeid); |
| 682 | } |
| 683 | |