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 | * dlmconvert.c |
| 5 | * |
| 6 | * underlying calls for lock conversion |
| 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 | |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/fs.h> |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/slab.h> |
| 32 | #include <linux/highmem.h> |
| 33 | #include <linux/utsname.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/sysctl.h> |
| 36 | #include <linux/random.h> |
| 37 | #include <linux/blkdev.h> |
| 38 | #include <linux/socket.h> |
| 39 | #include <linux/inet.h> |
| 40 | #include <linux/spinlock.h> |
| 41 | |
| 42 | |
| 43 | #include "cluster/heartbeat.h" |
| 44 | #include "cluster/nodemanager.h" |
| 45 | #include "cluster/tcp.h" |
| 46 | |
| 47 | #include "dlmapi.h" |
| 48 | #include "dlmcommon.h" |
| 49 | |
| 50 | #include "dlmconvert.h" |
| 51 | |
| 52 | #define MLOG_MASK_PREFIX ML_DLM |
| 53 | #include "cluster/masklog.h" |
| 54 | |
| 55 | /* NOTE: __dlmconvert_master is the only function in here that |
| 56 | * needs a spinlock held on entry (res->spinlock) and it is the |
| 57 | * only one that holds a lock on exit (res->spinlock). |
| 58 | * All other functions in here need no locks and drop all of |
| 59 | * the locks that they acquire. */ |
| 60 | static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm, |
| 61 | struct dlm_lock_resource *res, |
| 62 | struct dlm_lock *lock, int flags, |
| 63 | int type, int *call_ast, |
| 64 | int *kick_thread); |
| 65 | static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm, |
| 66 | struct dlm_lock_resource *res, |
| 67 | struct dlm_lock *lock, int flags, int type); |
| 68 | |
| 69 | /* |
| 70 | * this is only called directly by dlmlock(), and only when the |
| 71 | * local node is the owner of the lockres |
| 72 | * locking: |
| 73 | * caller needs: none |
| 74 | * taken: takes and drops res->spinlock |
| 75 | * held on exit: none |
| 76 | * returns: see __dlmconvert_master |
| 77 | */ |
| 78 | enum dlm_status dlmconvert_master(struct dlm_ctxt *dlm, |
| 79 | struct dlm_lock_resource *res, |
| 80 | struct dlm_lock *lock, int flags, int type) |
| 81 | { |
| 82 | int call_ast = 0, kick_thread = 0; |
| 83 | enum dlm_status status; |
| 84 | |
| 85 | spin_lock(&res->spinlock); |
| 86 | /* we are not in a network handler, this is fine */ |
| 87 | __dlm_wait_on_lockres(res); |
| 88 | __dlm_lockres_reserve_ast(res); |
| 89 | res->state |= DLM_LOCK_RES_IN_PROGRESS; |
| 90 | |
| 91 | status = __dlmconvert_master(dlm, res, lock, flags, type, |
| 92 | &call_ast, &kick_thread); |
| 93 | |
| 94 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; |
| 95 | spin_unlock(&res->spinlock); |
| 96 | wake_up(&res->wq); |
| 97 | if (status != DLM_NORMAL && status != DLM_NOTQUEUED) |
| 98 | dlm_error(status); |
| 99 | |
| 100 | /* either queue the ast or release it */ |
| 101 | if (call_ast) |
| 102 | dlm_queue_ast(dlm, lock); |
| 103 | else |
| 104 | dlm_lockres_release_ast(dlm, res); |
| 105 | |
| 106 | if (kick_thread) |
| 107 | dlm_kick_thread(dlm, res); |
| 108 | |
| 109 | return status; |
| 110 | } |
| 111 | |
| 112 | /* performs lock conversion at the lockres master site |
| 113 | * locking: |
| 114 | * caller needs: res->spinlock |
| 115 | * taken: takes and drops lock->spinlock |
| 116 | * held on exit: res->spinlock |
| 117 | * returns: DLM_NORMAL, DLM_NOTQUEUED, DLM_DENIED |
| 118 | * call_ast: whether ast should be called for this lock |
| 119 | * kick_thread: whether dlm_kick_thread should be called |
| 120 | */ |
| 121 | static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm, |
| 122 | struct dlm_lock_resource *res, |
| 123 | struct dlm_lock *lock, int flags, |
| 124 | int type, int *call_ast, |
| 125 | int *kick_thread) |
| 126 | { |
| 127 | enum dlm_status status = DLM_NORMAL; |
| 128 | struct list_head *iter; |
| 129 | struct dlm_lock *tmplock=NULL; |
| 130 | |
| 131 | assert_spin_locked(&res->spinlock); |
| 132 | |
| 133 | mlog_entry("type=%d, convert_type=%d, new convert_type=%d\n", |
| 134 | lock->ml.type, lock->ml.convert_type, type); |
| 135 | |
| 136 | spin_lock(&lock->spinlock); |
| 137 | |
| 138 | /* already converting? */ |
| 139 | if (lock->ml.convert_type != LKM_IVMODE) { |
| 140 | mlog(ML_ERROR, "attempted to convert a lock with a lock " |
| 141 | "conversion pending\n"); |
| 142 | status = DLM_DENIED; |
| 143 | goto unlock_exit; |
| 144 | } |
| 145 | |
| 146 | /* must be on grant queue to convert */ |
| 147 | if (!dlm_lock_on_list(&res->granted, lock)) { |
| 148 | mlog(ML_ERROR, "attempted to convert a lock not on grant " |
| 149 | "queue\n"); |
| 150 | status = DLM_DENIED; |
| 151 | goto unlock_exit; |
| 152 | } |
| 153 | |
| 154 | if (flags & LKM_VALBLK) { |
| 155 | switch (lock->ml.type) { |
| 156 | case LKM_EXMODE: |
| 157 | /* EX + LKM_VALBLK + convert == set lvb */ |
| 158 | mlog(0, "will set lvb: converting %s->%s\n", |
| 159 | dlm_lock_mode_name(lock->ml.type), |
| 160 | dlm_lock_mode_name(type)); |
| 161 | lock->lksb->flags |= DLM_LKSB_PUT_LVB; |
| 162 | break; |
| 163 | case LKM_PRMODE: |
| 164 | case LKM_NLMODE: |
| 165 | /* refetch if new level is not NL */ |
| 166 | if (type > LKM_NLMODE) { |
| 167 | mlog(0, "will fetch new value into " |
| 168 | "lvb: converting %s->%s\n", |
| 169 | dlm_lock_mode_name(lock->ml.type), |
| 170 | dlm_lock_mode_name(type)); |
| 171 | lock->lksb->flags |= DLM_LKSB_GET_LVB; |
| 172 | } else { |
| 173 | mlog(0, "will NOT fetch new value " |
| 174 | "into lvb: converting %s->%s\n", |
| 175 | dlm_lock_mode_name(lock->ml.type), |
| 176 | dlm_lock_mode_name(type)); |
| 177 | flags &= ~(LKM_VALBLK); |
| 178 | } |
| 179 | break; |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | |
| 184 | /* in-place downconvert? */ |
| 185 | if (type <= lock->ml.type) |
| 186 | goto grant; |
| 187 | |
| 188 | /* upconvert from here on */ |
| 189 | status = DLM_NORMAL; |
| 190 | list_for_each(iter, &res->granted) { |
| 191 | tmplock = list_entry(iter, struct dlm_lock, list); |
| 192 | if (tmplock == lock) |
| 193 | continue; |
| 194 | if (!dlm_lock_compatible(tmplock->ml.type, type)) |
| 195 | goto switch_queues; |
| 196 | } |
| 197 | |
| 198 | list_for_each(iter, &res->converting) { |
| 199 | tmplock = list_entry(iter, struct dlm_lock, list); |
| 200 | if (!dlm_lock_compatible(tmplock->ml.type, type)) |
| 201 | goto switch_queues; |
| 202 | /* existing conversion requests take precedence */ |
| 203 | if (!dlm_lock_compatible(tmplock->ml.convert_type, type)) |
| 204 | goto switch_queues; |
| 205 | } |
| 206 | |
| 207 | /* fall thru to grant */ |
| 208 | |
| 209 | grant: |
| 210 | mlog(0, "res %.*s, granting %s lock\n", res->lockname.len, |
| 211 | res->lockname.name, dlm_lock_mode_name(type)); |
| 212 | /* immediately grant the new lock type */ |
| 213 | lock->lksb->status = DLM_NORMAL; |
| 214 | if (lock->ml.node == dlm->node_num) |
| 215 | mlog(0, "doing in-place convert for nonlocal lock\n"); |
| 216 | lock->ml.type = type; |
| 217 | status = DLM_NORMAL; |
| 218 | *call_ast = 1; |
| 219 | goto unlock_exit; |
| 220 | |
| 221 | switch_queues: |
| 222 | if (flags & LKM_NOQUEUE) { |
| 223 | mlog(0, "failed to convert NOQUEUE lock %.*s from " |
| 224 | "%d to %d...\n", res->lockname.len, res->lockname.name, |
| 225 | lock->ml.type, type); |
| 226 | status = DLM_NOTQUEUED; |
| 227 | goto unlock_exit; |
| 228 | } |
| 229 | mlog(0, "res %.*s, queueing...\n", res->lockname.len, |
| 230 | res->lockname.name); |
| 231 | |
| 232 | lock->ml.convert_type = type; |
| 233 | /* do not alter lock refcount. switching lists. */ |
Akinobu Mita | f116629 | 2006-06-26 00:24:46 -0700 | [diff] [blame] | 234 | list_move_tail(&lock->list, &res->converting); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 235 | |
| 236 | unlock_exit: |
| 237 | spin_unlock(&lock->spinlock); |
| 238 | if (status == DLM_DENIED) { |
| 239 | __dlm_print_one_lock_resource(res); |
| 240 | } |
| 241 | if (status == DLM_NORMAL) |
| 242 | *kick_thread = 1; |
| 243 | return status; |
| 244 | } |
| 245 | |
| 246 | void dlm_revert_pending_convert(struct dlm_lock_resource *res, |
| 247 | struct dlm_lock *lock) |
| 248 | { |
| 249 | /* do not alter lock refcount. switching lists. */ |
Akinobu Mita | f116629 | 2006-06-26 00:24:46 -0700 | [diff] [blame] | 250 | list_move_tail(&lock->list, &res->granted); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 251 | lock->ml.convert_type = LKM_IVMODE; |
| 252 | lock->lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB); |
| 253 | } |
| 254 | |
| 255 | /* messages the master site to do lock conversion |
| 256 | * locking: |
| 257 | * caller needs: none |
| 258 | * taken: takes and drops res->spinlock, uses DLM_LOCK_RES_IN_PROGRESS |
| 259 | * held on exit: none |
| 260 | * returns: DLM_NORMAL, DLM_RECOVERING, status from remote node |
| 261 | */ |
| 262 | enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm, |
| 263 | struct dlm_lock_resource *res, |
| 264 | struct dlm_lock *lock, int flags, int type) |
| 265 | { |
| 266 | enum dlm_status status; |
| 267 | |
| 268 | mlog(0, "type=%d, convert_type=%d, busy=%d\n", lock->ml.type, |
| 269 | lock->ml.convert_type, res->state & DLM_LOCK_RES_IN_PROGRESS); |
| 270 | |
| 271 | spin_lock(&res->spinlock); |
| 272 | if (res->state & DLM_LOCK_RES_RECOVERING) { |
| 273 | mlog(0, "bailing out early since res is RECOVERING " |
| 274 | "on secondary queue\n"); |
| 275 | /* __dlm_print_one_lock_resource(res); */ |
| 276 | status = DLM_RECOVERING; |
| 277 | goto bail; |
| 278 | } |
| 279 | /* will exit this call with spinlock held */ |
| 280 | __dlm_wait_on_lockres(res); |
| 281 | |
| 282 | if (lock->ml.convert_type != LKM_IVMODE) { |
| 283 | __dlm_print_one_lock_resource(res); |
| 284 | mlog(ML_ERROR, "converting a remote lock that is already " |
Kurt Hackel | 2900485 | 2006-03-02 16:43:36 -0800 | [diff] [blame] | 285 | "converting! (cookie=%u:%llu, conv=%d)\n", |
| 286 | dlm_get_lock_cookie_node(lock->ml.cookie), |
| 287 | dlm_get_lock_cookie_seq(lock->ml.cookie), |
| 288 | lock->ml.convert_type); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 289 | status = DLM_DENIED; |
| 290 | goto bail; |
| 291 | } |
| 292 | res->state |= DLM_LOCK_RES_IN_PROGRESS; |
| 293 | /* move lock to local convert queue */ |
| 294 | /* do not alter lock refcount. switching lists. */ |
Akinobu Mita | f116629 | 2006-06-26 00:24:46 -0700 | [diff] [blame] | 295 | list_move_tail(&lock->list, &res->converting); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 296 | lock->convert_pending = 1; |
| 297 | lock->ml.convert_type = type; |
| 298 | |
| 299 | if (flags & LKM_VALBLK) { |
| 300 | if (lock->ml.type == LKM_EXMODE) { |
| 301 | flags |= LKM_PUT_LVB; |
| 302 | lock->lksb->flags |= DLM_LKSB_PUT_LVB; |
| 303 | } else { |
| 304 | if (lock->ml.convert_type == LKM_NLMODE) |
| 305 | flags &= ~LKM_VALBLK; |
| 306 | else { |
| 307 | flags |= LKM_GET_LVB; |
| 308 | lock->lksb->flags |= DLM_LKSB_GET_LVB; |
| 309 | } |
| 310 | } |
| 311 | } |
| 312 | spin_unlock(&res->spinlock); |
| 313 | |
| 314 | /* no locks held here. |
| 315 | * need to wait for a reply as to whether it got queued or not. */ |
| 316 | status = dlm_send_remote_convert_request(dlm, res, lock, flags, type); |
| 317 | |
| 318 | spin_lock(&res->spinlock); |
| 319 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; |
| 320 | lock->convert_pending = 0; |
| 321 | /* if it failed, move it back to granted queue */ |
| 322 | if (status != DLM_NORMAL) { |
| 323 | if (status != DLM_NOTQUEUED) |
| 324 | dlm_error(status); |
| 325 | dlm_revert_pending_convert(res, lock); |
| 326 | } |
| 327 | bail: |
| 328 | spin_unlock(&res->spinlock); |
| 329 | |
| 330 | /* TODO: should this be a wake_one? */ |
| 331 | /* wake up any IN_PROGRESS waiters */ |
| 332 | wake_up(&res->wq); |
| 333 | |
| 334 | return status; |
| 335 | } |
| 336 | |
| 337 | /* sends DLM_CONVERT_LOCK_MSG to master site |
| 338 | * locking: |
| 339 | * caller needs: none |
| 340 | * taken: none |
| 341 | * held on exit: none |
| 342 | * returns: DLM_NOLOCKMGR, status from remote node |
| 343 | */ |
| 344 | static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm, |
| 345 | struct dlm_lock_resource *res, |
| 346 | struct dlm_lock *lock, int flags, int type) |
| 347 | { |
| 348 | struct dlm_convert_lock convert; |
| 349 | int tmpret; |
| 350 | enum dlm_status ret; |
| 351 | int status = 0; |
| 352 | struct kvec vec[2]; |
| 353 | size_t veclen = 1; |
| 354 | |
| 355 | mlog_entry("%.*s\n", res->lockname.len, res->lockname.name); |
| 356 | |
| 357 | memset(&convert, 0, sizeof(struct dlm_convert_lock)); |
| 358 | convert.node_idx = dlm->node_num; |
| 359 | convert.requested_type = type; |
| 360 | convert.cookie = lock->ml.cookie; |
| 361 | convert.namelen = res->lockname.len; |
| 362 | convert.flags = cpu_to_be32(flags); |
| 363 | memcpy(convert.name, res->lockname.name, convert.namelen); |
| 364 | |
| 365 | vec[0].iov_len = sizeof(struct dlm_convert_lock); |
| 366 | vec[0].iov_base = &convert; |
| 367 | |
| 368 | if (flags & LKM_PUT_LVB) { |
| 369 | /* extra data to send if we are updating lvb */ |
| 370 | vec[1].iov_len = DLM_LVB_LEN; |
| 371 | vec[1].iov_base = lock->lksb->lvb; |
| 372 | veclen++; |
| 373 | } |
| 374 | |
| 375 | tmpret = o2net_send_message_vec(DLM_CONVERT_LOCK_MSG, dlm->key, |
| 376 | vec, veclen, res->owner, &status); |
| 377 | if (tmpret >= 0) { |
| 378 | // successfully sent and received |
| 379 | ret = status; // this is already a dlm_status |
| 380 | if (ret == DLM_RECOVERING) { |
| 381 | mlog(0, "node %u returned DLM_RECOVERING from convert " |
| 382 | "message!\n", res->owner); |
| 383 | } else if (ret == DLM_MIGRATING) { |
| 384 | mlog(0, "node %u returned DLM_MIGRATING from convert " |
| 385 | "message!\n", res->owner); |
| 386 | } else if (ret == DLM_FORWARD) { |
| 387 | mlog(0, "node %u returned DLM_FORWARD from convert " |
| 388 | "message!\n", res->owner); |
| 389 | } else if (ret != DLM_NORMAL && ret != DLM_NOTQUEUED) |
| 390 | dlm_error(ret); |
| 391 | } else { |
| 392 | mlog_errno(tmpret); |
| 393 | if (dlm_is_host_down(tmpret)) { |
Kurt Hackel | 44465a7 | 2006-01-18 17:05:38 -0800 | [diff] [blame] | 394 | /* instead of logging the same network error over |
| 395 | * and over, sleep here and wait for the heartbeat |
| 396 | * to notice the node is dead. times out after 5s. */ |
| 397 | dlm_wait_for_node_death(dlm, res->owner, |
| 398 | DLM_NODE_DEATH_WAIT_MAX); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 399 | ret = DLM_RECOVERING; |
| 400 | mlog(0, "node %u died so returning DLM_RECOVERING " |
| 401 | "from convert message!\n", res->owner); |
| 402 | } else { |
| 403 | ret = dlm_err_to_dlm_status(tmpret); |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | return ret; |
| 408 | } |
| 409 | |
| 410 | /* handler for DLM_CONVERT_LOCK_MSG on master site |
| 411 | * locking: |
| 412 | * caller needs: none |
| 413 | * taken: takes and drop res->spinlock |
| 414 | * held on exit: none |
| 415 | * returns: DLM_NORMAL, DLM_IVLOCKID, DLM_BADARGS, |
| 416 | * status from __dlmconvert_master |
| 417 | */ |
| 418 | int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data) |
| 419 | { |
| 420 | struct dlm_ctxt *dlm = data; |
| 421 | struct dlm_convert_lock *cnv = (struct dlm_convert_lock *)msg->buf; |
| 422 | struct dlm_lock_resource *res = NULL; |
| 423 | struct list_head *iter; |
| 424 | struct dlm_lock *lock = NULL; |
| 425 | struct dlm_lockstatus *lksb; |
| 426 | enum dlm_status status = DLM_NORMAL; |
| 427 | u32 flags; |
Kurt Hackel | e2b5e45 | 2006-01-18 17:02:56 -0800 | [diff] [blame] | 428 | int call_ast = 0, kick_thread = 0, ast_reserved = 0; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 429 | |
| 430 | if (!dlm_grab(dlm)) { |
| 431 | dlm_error(DLM_REJECTED); |
| 432 | return DLM_REJECTED; |
| 433 | } |
| 434 | |
| 435 | mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), |
| 436 | "Domain %s not fully joined!\n", dlm->name); |
| 437 | |
| 438 | if (cnv->namelen > DLM_LOCKID_NAME_MAX) { |
| 439 | status = DLM_IVBUFLEN; |
| 440 | dlm_error(status); |
| 441 | goto leave; |
| 442 | } |
| 443 | |
| 444 | flags = be32_to_cpu(cnv->flags); |
| 445 | |
| 446 | if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) == |
| 447 | (LKM_PUT_LVB|LKM_GET_LVB)) { |
| 448 | mlog(ML_ERROR, "both PUT and GET lvb specified\n"); |
| 449 | status = DLM_BADARGS; |
| 450 | goto leave; |
| 451 | } |
| 452 | |
| 453 | mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : |
| 454 | (flags & LKM_GET_LVB ? "get lvb" : "none")); |
| 455 | |
| 456 | status = DLM_IVLOCKID; |
| 457 | res = dlm_lookup_lockres(dlm, cnv->name, cnv->namelen); |
| 458 | if (!res) { |
| 459 | dlm_error(status); |
| 460 | goto leave; |
| 461 | } |
| 462 | |
| 463 | spin_lock(&res->spinlock); |
| 464 | list_for_each(iter, &res->granted) { |
| 465 | lock = list_entry(iter, struct dlm_lock, list); |
| 466 | if (lock->ml.cookie == cnv->cookie && |
| 467 | lock->ml.node == cnv->node_idx) { |
| 468 | dlm_lock_get(lock); |
| 469 | break; |
| 470 | } |
| 471 | lock = NULL; |
| 472 | } |
| 473 | spin_unlock(&res->spinlock); |
| 474 | if (!lock) { |
| 475 | status = DLM_IVLOCKID; |
| 476 | dlm_error(status); |
| 477 | goto leave; |
| 478 | } |
| 479 | |
| 480 | /* found the lock */ |
| 481 | lksb = lock->lksb; |
| 482 | |
| 483 | /* see if caller needed to get/put lvb */ |
| 484 | if (flags & LKM_PUT_LVB) { |
| 485 | BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); |
| 486 | lksb->flags |= DLM_LKSB_PUT_LVB; |
| 487 | memcpy(&lksb->lvb[0], &cnv->lvb[0], DLM_LVB_LEN); |
| 488 | } else if (flags & LKM_GET_LVB) { |
| 489 | BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); |
| 490 | lksb->flags |= DLM_LKSB_GET_LVB; |
| 491 | } |
| 492 | |
| 493 | spin_lock(&res->spinlock); |
| 494 | status = __dlm_lockres_state_to_status(res); |
| 495 | if (status == DLM_NORMAL) { |
| 496 | __dlm_lockres_reserve_ast(res); |
Kurt Hackel | e2b5e45 | 2006-01-18 17:02:56 -0800 | [diff] [blame] | 497 | ast_reserved = 1; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 498 | res->state |= DLM_LOCK_RES_IN_PROGRESS; |
| 499 | status = __dlmconvert_master(dlm, res, lock, flags, |
| 500 | cnv->requested_type, |
| 501 | &call_ast, &kick_thread); |
| 502 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; |
| 503 | } |
| 504 | spin_unlock(&res->spinlock); |
| 505 | |
| 506 | if (status != DLM_NORMAL) { |
| 507 | if (status != DLM_NOTQUEUED) |
| 508 | dlm_error(status); |
| 509 | lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB); |
| 510 | } |
| 511 | |
| 512 | leave: |
| 513 | if (!lock) |
| 514 | mlog(ML_ERROR, "did not find lock to convert on grant queue! " |
Kurt Hackel | 2900485 | 2006-03-02 16:43:36 -0800 | [diff] [blame] | 515 | "cookie=%u:%llu\n", |
| 516 | dlm_get_lock_cookie_node(cnv->cookie), |
| 517 | dlm_get_lock_cookie_seq(cnv->cookie)); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 518 | else |
| 519 | dlm_lock_put(lock); |
| 520 | |
Kurt Hackel | e2b5e45 | 2006-01-18 17:02:56 -0800 | [diff] [blame] | 521 | /* either queue the ast or release it, if reserved */ |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 522 | if (call_ast) |
| 523 | dlm_queue_ast(dlm, lock); |
Kurt Hackel | e2b5e45 | 2006-01-18 17:02:56 -0800 | [diff] [blame] | 524 | else if (ast_reserved) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 525 | dlm_lockres_release_ast(dlm, res); |
| 526 | |
| 527 | if (kick_thread) |
| 528 | dlm_kick_thread(dlm, res); |
| 529 | |
| 530 | if (res) |
| 531 | dlm_lockres_put(res); |
| 532 | |
| 533 | dlm_put(dlm); |
| 534 | |
| 535 | return status; |
| 536 | } |