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 | * dlmunlock.c |
| 5 | * |
| 6 | * underlying calls for unlocking locks |
| 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 | #include <linux/delay.h> |
| 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 | #define MLOG_MASK_PREFIX ML_DLM |
| 51 | #include "cluster/masklog.h" |
| 52 | |
| 53 | #define DLM_UNLOCK_FREE_LOCK 0x00000001 |
| 54 | #define DLM_UNLOCK_CALL_AST 0x00000002 |
| 55 | #define DLM_UNLOCK_REMOVE_LOCK 0x00000004 |
| 56 | #define DLM_UNLOCK_REGRANT_LOCK 0x00000008 |
| 57 | #define DLM_UNLOCK_CLEAR_CONVERT_TYPE 0x00000010 |
| 58 | |
| 59 | |
| 60 | static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, |
| 61 | struct dlm_lock_resource *res, |
| 62 | struct dlm_lock *lock, |
| 63 | struct dlm_lockstatus *lksb, |
| 64 | int *actions); |
| 65 | static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, |
| 66 | struct dlm_lock_resource *res, |
| 67 | struct dlm_lock *lock, |
| 68 | struct dlm_lockstatus *lksb, |
| 69 | int *actions); |
| 70 | |
| 71 | static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, |
| 72 | struct dlm_lock_resource *res, |
| 73 | struct dlm_lock *lock, |
| 74 | struct dlm_lockstatus *lksb, |
| 75 | int flags, |
| 76 | u8 owner); |
| 77 | |
| 78 | |
| 79 | /* |
| 80 | * according to the spec: |
| 81 | * http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf |
| 82 | * |
| 83 | * flags & LKM_CANCEL != 0: must be converting or blocked |
| 84 | * flags & LKM_CANCEL == 0: must be granted |
| 85 | * |
| 86 | * So to unlock a converting lock, you must first cancel the |
| 87 | * convert (passing LKM_CANCEL in flags), then call the unlock |
| 88 | * again (with no LKM_CANCEL in flags). |
| 89 | */ |
| 90 | |
| 91 | |
| 92 | /* |
| 93 | * locking: |
| 94 | * caller needs: none |
| 95 | * taken: res->spinlock and lock->spinlock taken and dropped |
| 96 | * held on exit: none |
| 97 | * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network |
| 98 | * all callers should have taken an extra ref on lock coming in |
| 99 | */ |
| 100 | static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm, |
| 101 | struct dlm_lock_resource *res, |
| 102 | struct dlm_lock *lock, |
| 103 | struct dlm_lockstatus *lksb, |
| 104 | int flags, int *call_ast, |
| 105 | int master_node) |
| 106 | { |
| 107 | enum dlm_status status; |
| 108 | int actions = 0; |
| 109 | int in_use; |
| 110 | u8 owner; |
| 111 | |
| 112 | mlog(0, "master_node = %d, valblk = %d\n", master_node, |
| 113 | flags & LKM_VALBLK); |
| 114 | |
| 115 | if (master_node) |
| 116 | BUG_ON(res->owner != dlm->node_num); |
| 117 | else |
| 118 | BUG_ON(res->owner == dlm->node_num); |
| 119 | |
| 120 | spin_lock(&dlm->spinlock); |
| 121 | /* We want to be sure that we're not freeing a lock |
| 122 | * that still has AST's pending... */ |
| 123 | in_use = !list_empty(&lock->ast_list); |
| 124 | spin_unlock(&dlm->spinlock); |
| 125 | if (in_use) { |
| 126 | mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock " |
| 127 | "while waiting for an ast!", res->lockname.len, |
| 128 | res->lockname.name); |
| 129 | return DLM_BADPARAM; |
| 130 | } |
| 131 | |
| 132 | spin_lock(&res->spinlock); |
| 133 | if (res->state & DLM_LOCK_RES_IN_PROGRESS) { |
| 134 | if (master_node) { |
| 135 | mlog(ML_ERROR, "lockres in progress!\n"); |
| 136 | spin_unlock(&res->spinlock); |
| 137 | return DLM_FORWARD; |
| 138 | } |
| 139 | /* ok for this to sleep if not in a network handler */ |
| 140 | __dlm_wait_on_lockres(res); |
| 141 | res->state |= DLM_LOCK_RES_IN_PROGRESS; |
| 142 | } |
| 143 | spin_lock(&lock->spinlock); |
| 144 | |
| 145 | if (res->state & DLM_LOCK_RES_RECOVERING) { |
| 146 | status = DLM_RECOVERING; |
| 147 | goto leave; |
| 148 | } |
| 149 | |
| 150 | |
| 151 | /* see above for what the spec says about |
| 152 | * LKM_CANCEL and the lock queue state */ |
| 153 | if (flags & LKM_CANCEL) |
| 154 | status = dlm_get_cancel_actions(dlm, res, lock, lksb, &actions); |
| 155 | else |
| 156 | status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions); |
| 157 | |
Kurt Hackel | 34e3d18 | 2006-07-15 10:22:39 -0700 | [diff] [blame] | 158 | if (status != DLM_NORMAL && (status != DLM_CANCELGRANT || !master_node)) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 159 | goto leave; |
| 160 | |
| 161 | /* By now this has been masked out of cancel requests. */ |
| 162 | if (flags & LKM_VALBLK) { |
| 163 | /* make the final update to the lvb */ |
| 164 | if (master_node) |
| 165 | memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN); |
| 166 | else |
| 167 | flags |= LKM_PUT_LVB; /* let the send function |
| 168 | * handle it. */ |
| 169 | } |
| 170 | |
| 171 | if (!master_node) { |
| 172 | owner = res->owner; |
| 173 | /* drop locks and send message */ |
| 174 | if (flags & LKM_CANCEL) |
| 175 | lock->cancel_pending = 1; |
| 176 | else |
| 177 | lock->unlock_pending = 1; |
| 178 | spin_unlock(&lock->spinlock); |
| 179 | spin_unlock(&res->spinlock); |
| 180 | status = dlm_send_remote_unlock_request(dlm, res, lock, lksb, |
| 181 | flags, owner); |
| 182 | spin_lock(&res->spinlock); |
| 183 | spin_lock(&lock->spinlock); |
| 184 | /* if the master told us the lock was already granted, |
| 185 | * let the ast handle all of these actions */ |
Kurt Hackel | a23eac9 | 2006-06-18 21:28:01 -0700 | [diff] [blame] | 186 | if (status == DLM_CANCELGRANT) { |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 187 | actions &= ~(DLM_UNLOCK_REMOVE_LOCK| |
| 188 | DLM_UNLOCK_REGRANT_LOCK| |
| 189 | DLM_UNLOCK_CLEAR_CONVERT_TYPE); |
Kurt Hackel | e2faea4 | 2006-01-12 14:24:55 -0800 | [diff] [blame] | 190 | } else if (status == DLM_RECOVERING || |
| 191 | status == DLM_MIGRATING || |
| 192 | status == DLM_FORWARD) { |
| 193 | /* must clear the actions because this unlock |
| 194 | * is about to be retried. cannot free or do |
| 195 | * any list manipulation. */ |
| 196 | mlog(0, "%s:%.*s: clearing actions, %s\n", |
| 197 | dlm->name, res->lockname.len, |
| 198 | res->lockname.name, |
| 199 | status==DLM_RECOVERING?"recovering": |
| 200 | (status==DLM_MIGRATING?"migrating": |
| 201 | "forward")); |
| 202 | actions = 0; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 203 | } |
| 204 | if (flags & LKM_CANCEL) |
| 205 | lock->cancel_pending = 0; |
| 206 | else |
| 207 | lock->unlock_pending = 0; |
| 208 | |
| 209 | } |
| 210 | |
| 211 | /* get an extra ref on lock. if we are just switching |
| 212 | * lists here, we dont want the lock to go away. */ |
| 213 | dlm_lock_get(lock); |
| 214 | |
| 215 | if (actions & DLM_UNLOCK_REMOVE_LOCK) { |
| 216 | list_del_init(&lock->list); |
| 217 | dlm_lock_put(lock); |
| 218 | } |
| 219 | if (actions & DLM_UNLOCK_REGRANT_LOCK) { |
| 220 | dlm_lock_get(lock); |
| 221 | list_add_tail(&lock->list, &res->granted); |
| 222 | } |
| 223 | if (actions & DLM_UNLOCK_CLEAR_CONVERT_TYPE) { |
| 224 | mlog(0, "clearing convert_type at %smaster node\n", |
| 225 | master_node ? "" : "non-"); |
| 226 | lock->ml.convert_type = LKM_IVMODE; |
| 227 | } |
| 228 | |
| 229 | /* remove the extra ref on lock */ |
| 230 | dlm_lock_put(lock); |
| 231 | |
| 232 | leave: |
| 233 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; |
| 234 | if (!dlm_lock_on_list(&res->converting, lock)) |
| 235 | BUG_ON(lock->ml.convert_type != LKM_IVMODE); |
| 236 | else |
| 237 | BUG_ON(lock->ml.convert_type == LKM_IVMODE); |
| 238 | spin_unlock(&lock->spinlock); |
| 239 | spin_unlock(&res->spinlock); |
| 240 | wake_up(&res->wq); |
| 241 | |
| 242 | /* let the caller's final dlm_lock_put handle the actual kfree */ |
| 243 | if (actions & DLM_UNLOCK_FREE_LOCK) { |
| 244 | /* this should always be coupled with list removal */ |
| 245 | BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK)); |
Kurt Hackel | 2900485 | 2006-03-02 16:43:36 -0800 | [diff] [blame] | 246 | mlog(0, "lock %u:%llu should be gone now! refs=%d\n", |
| 247 | dlm_get_lock_cookie_node(lock->ml.cookie), |
| 248 | dlm_get_lock_cookie_seq(lock->ml.cookie), |
| 249 | atomic_read(&lock->lock_refs.refcount)-1); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 250 | dlm_lock_put(lock); |
| 251 | } |
| 252 | if (actions & DLM_UNLOCK_CALL_AST) |
| 253 | *call_ast = 1; |
| 254 | |
| 255 | /* if cancel or unlock succeeded, lvb work is done */ |
| 256 | if (status == DLM_NORMAL) |
| 257 | lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB); |
| 258 | |
| 259 | return status; |
| 260 | } |
| 261 | |
| 262 | void dlm_commit_pending_unlock(struct dlm_lock_resource *res, |
| 263 | struct dlm_lock *lock) |
| 264 | { |
| 265 | /* leave DLM_LKSB_PUT_LVB on the lksb so any final |
| 266 | * update of the lvb will be sent to the new master */ |
| 267 | list_del_init(&lock->list); |
| 268 | } |
| 269 | |
| 270 | void dlm_commit_pending_cancel(struct dlm_lock_resource *res, |
| 271 | struct dlm_lock *lock) |
| 272 | { |
Akinobu Mita | f116629 | 2006-06-26 00:24:46 -0700 | [diff] [blame] | 273 | list_move_tail(&lock->list, &res->granted); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 274 | lock->ml.convert_type = LKM_IVMODE; |
| 275 | } |
| 276 | |
| 277 | |
| 278 | static inline enum dlm_status dlmunlock_master(struct dlm_ctxt *dlm, |
| 279 | struct dlm_lock_resource *res, |
| 280 | struct dlm_lock *lock, |
| 281 | struct dlm_lockstatus *lksb, |
| 282 | int flags, |
| 283 | int *call_ast) |
| 284 | { |
| 285 | return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 1); |
| 286 | } |
| 287 | |
| 288 | static inline enum dlm_status dlmunlock_remote(struct dlm_ctxt *dlm, |
| 289 | struct dlm_lock_resource *res, |
| 290 | struct dlm_lock *lock, |
| 291 | struct dlm_lockstatus *lksb, |
| 292 | int flags, int *call_ast) |
| 293 | { |
| 294 | return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 0); |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | * locking: |
| 299 | * caller needs: none |
| 300 | * taken: none |
| 301 | * held on exit: none |
| 302 | * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network |
| 303 | */ |
| 304 | static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, |
| 305 | struct dlm_lock_resource *res, |
| 306 | struct dlm_lock *lock, |
| 307 | struct dlm_lockstatus *lksb, |
| 308 | int flags, |
| 309 | u8 owner) |
| 310 | { |
| 311 | struct dlm_unlock_lock unlock; |
| 312 | int tmpret; |
| 313 | enum dlm_status ret; |
| 314 | int status = 0; |
| 315 | struct kvec vec[2]; |
| 316 | size_t veclen = 1; |
| 317 | |
| 318 | mlog_entry("%.*s\n", res->lockname.len, res->lockname.name); |
Kurt Hackel | 0032abd | 2006-05-01 14:39:57 -0700 | [diff] [blame] | 319 | |
Kurt Hackel | 2580a58 | 2006-04-27 17:59:46 -0700 | [diff] [blame] | 320 | if (owner == dlm->node_num) { |
| 321 | /* ended up trying to contact ourself. this means |
| 322 | * that the lockres had been remote but became local |
| 323 | * via a migration. just retry it, now as local */ |
| 324 | mlog(0, "%s:%.*s: this node became the master due to a " |
| 325 | "migration, re-evaluate now\n", dlm->name, |
| 326 | res->lockname.len, res->lockname.name); |
| 327 | return DLM_FORWARD; |
| 328 | } |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 329 | |
| 330 | memset(&unlock, 0, sizeof(unlock)); |
| 331 | unlock.node_idx = dlm->node_num; |
| 332 | unlock.flags = cpu_to_be32(flags); |
| 333 | unlock.cookie = lock->ml.cookie; |
| 334 | unlock.namelen = res->lockname.len; |
| 335 | memcpy(unlock.name, res->lockname.name, unlock.namelen); |
| 336 | |
| 337 | vec[0].iov_len = sizeof(struct dlm_unlock_lock); |
| 338 | vec[0].iov_base = &unlock; |
| 339 | |
| 340 | if (flags & LKM_PUT_LVB) { |
| 341 | /* extra data to send if we are updating lvb */ |
| 342 | vec[1].iov_len = DLM_LVB_LEN; |
| 343 | vec[1].iov_base = lock->lksb->lvb; |
| 344 | veclen++; |
| 345 | } |
| 346 | |
| 347 | tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key, |
| 348 | vec, veclen, owner, &status); |
| 349 | if (tmpret >= 0) { |
| 350 | // successfully sent and received |
Kurt Hackel | a23eac9 | 2006-06-18 21:28:01 -0700 | [diff] [blame] | 351 | if (status == DLM_FORWARD) |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 352 | mlog(0, "master was in-progress. retry\n"); |
Kurt Hackel | a23eac9 | 2006-06-18 21:28:01 -0700 | [diff] [blame] | 353 | ret = status; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 354 | } else { |
| 355 | mlog_errno(tmpret); |
| 356 | if (dlm_is_host_down(tmpret)) { |
| 357 | /* NOTE: this seems strange, but it is what we want. |
| 358 | * when the master goes down during a cancel or |
| 359 | * unlock, the recovery code completes the operation |
| 360 | * as if the master had not died, then passes the |
| 361 | * updated state to the recovery master. this thread |
| 362 | * just needs to finish out the operation and call |
| 363 | * the unlockast. */ |
| 364 | ret = DLM_NORMAL; |
| 365 | } else { |
| 366 | /* something bad. this will BUG in ocfs2 */ |
| 367 | ret = dlm_err_to_dlm_status(tmpret); |
| 368 | } |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | return ret; |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * locking: |
| 376 | * caller needs: none |
| 377 | * taken: takes and drops res->spinlock |
| 378 | * held on exit: none |
| 379 | * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID, |
| 380 | * return value from dlmunlock_master |
| 381 | */ |
| 382 | int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data) |
| 383 | { |
| 384 | struct dlm_ctxt *dlm = data; |
| 385 | struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf; |
| 386 | struct dlm_lock_resource *res = NULL; |
| 387 | struct list_head *iter; |
| 388 | struct dlm_lock *lock = NULL; |
| 389 | enum dlm_status status = DLM_NORMAL; |
| 390 | int found = 0, i; |
| 391 | struct dlm_lockstatus *lksb = NULL; |
| 392 | int ignore; |
| 393 | u32 flags; |
| 394 | struct list_head *queue; |
| 395 | |
| 396 | flags = be32_to_cpu(unlock->flags); |
| 397 | |
| 398 | if (flags & LKM_GET_LVB) { |
| 399 | mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n"); |
| 400 | return DLM_BADARGS; |
| 401 | } |
| 402 | |
| 403 | if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) { |
| 404 | mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL " |
| 405 | "request!\n"); |
| 406 | return DLM_BADARGS; |
| 407 | } |
| 408 | |
| 409 | if (unlock->namelen > DLM_LOCKID_NAME_MAX) { |
| 410 | mlog(ML_ERROR, "Invalid name length in unlock handler!\n"); |
| 411 | return DLM_IVBUFLEN; |
| 412 | } |
| 413 | |
| 414 | if (!dlm_grab(dlm)) |
| 415 | return DLM_REJECTED; |
| 416 | |
| 417 | mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), |
| 418 | "Domain %s not fully joined!\n", dlm->name); |
| 419 | |
| 420 | mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none"); |
| 421 | |
| 422 | res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen); |
| 423 | if (!res) { |
| 424 | /* We assume here that a no lock resource simply means |
| 425 | * it was migrated away and destroyed before the other |
| 426 | * node could detect it. */ |
| 427 | mlog(0, "returning DLM_FORWARD -- res no longer exists\n"); |
| 428 | status = DLM_FORWARD; |
| 429 | goto not_found; |
| 430 | } |
| 431 | |
| 432 | queue=&res->granted; |
| 433 | found = 0; |
| 434 | spin_lock(&res->spinlock); |
| 435 | if (res->state & DLM_LOCK_RES_RECOVERING) { |
| 436 | spin_unlock(&res->spinlock); |
| 437 | mlog(0, "returning DLM_RECOVERING\n"); |
| 438 | status = DLM_RECOVERING; |
| 439 | goto leave; |
| 440 | } |
| 441 | |
| 442 | if (res->state & DLM_LOCK_RES_MIGRATING) { |
| 443 | spin_unlock(&res->spinlock); |
| 444 | mlog(0, "returning DLM_MIGRATING\n"); |
| 445 | status = DLM_MIGRATING; |
| 446 | goto leave; |
| 447 | } |
| 448 | |
| 449 | if (res->owner != dlm->node_num) { |
| 450 | spin_unlock(&res->spinlock); |
| 451 | mlog(0, "returning DLM_FORWARD -- not master\n"); |
| 452 | status = DLM_FORWARD; |
| 453 | goto leave; |
| 454 | } |
| 455 | |
| 456 | for (i=0; i<3; i++) { |
| 457 | list_for_each(iter, queue) { |
| 458 | lock = list_entry(iter, struct dlm_lock, list); |
| 459 | if (lock->ml.cookie == unlock->cookie && |
| 460 | lock->ml.node == unlock->node_idx) { |
| 461 | dlm_lock_get(lock); |
| 462 | found = 1; |
| 463 | break; |
| 464 | } |
| 465 | } |
| 466 | if (found) |
| 467 | break; |
| 468 | /* scan granted -> converting -> blocked queues */ |
| 469 | queue++; |
| 470 | } |
| 471 | spin_unlock(&res->spinlock); |
| 472 | if (!found) { |
| 473 | status = DLM_IVLOCKID; |
| 474 | goto not_found; |
| 475 | } |
| 476 | |
| 477 | /* lock was found on queue */ |
| 478 | lksb = lock->lksb; |
Kurt Hackel | 4b1af77 | 2006-06-26 15:17:47 -0700 | [diff] [blame] | 479 | if (flags & (LKM_VALBLK|LKM_PUT_LVB) && |
| 480 | lock->ml.type != LKM_EXMODE) |
| 481 | flags &= ~(LKM_VALBLK|LKM_PUT_LVB); |
| 482 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 483 | /* unlockast only called on originating node */ |
| 484 | if (flags & LKM_PUT_LVB) { |
| 485 | lksb->flags |= DLM_LKSB_PUT_LVB; |
| 486 | memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN); |
| 487 | } |
| 488 | |
| 489 | /* if this is in-progress, propagate the DLM_FORWARD |
| 490 | * all the way back out */ |
| 491 | status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore); |
| 492 | if (status == DLM_FORWARD) |
| 493 | mlog(0, "lockres is in progress\n"); |
| 494 | |
| 495 | if (flags & LKM_PUT_LVB) |
| 496 | lksb->flags &= ~DLM_LKSB_PUT_LVB; |
| 497 | |
| 498 | dlm_lockres_calc_usage(dlm, res); |
| 499 | dlm_kick_thread(dlm, res); |
| 500 | |
| 501 | not_found: |
| 502 | if (!found) |
| 503 | mlog(ML_ERROR, "failed to find lock to unlock! " |
Kurt Hackel | 2900485 | 2006-03-02 16:43:36 -0800 | [diff] [blame] | 504 | "cookie=%u:%llu\n", |
| 505 | dlm_get_lock_cookie_node(unlock->cookie), |
| 506 | dlm_get_lock_cookie_seq(unlock->cookie)); |
Kurt Hackel | a23eac9 | 2006-06-18 21:28:01 -0700 | [diff] [blame] | 507 | else |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 508 | dlm_lock_put(lock); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 509 | |
| 510 | leave: |
| 511 | if (res) |
| 512 | dlm_lockres_put(res); |
| 513 | |
| 514 | dlm_put(dlm); |
| 515 | |
| 516 | return status; |
| 517 | } |
| 518 | |
| 519 | |
| 520 | static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, |
| 521 | struct dlm_lock_resource *res, |
| 522 | struct dlm_lock *lock, |
| 523 | struct dlm_lockstatus *lksb, |
| 524 | int *actions) |
| 525 | { |
| 526 | enum dlm_status status; |
| 527 | |
| 528 | if (dlm_lock_on_list(&res->blocked, lock)) { |
| 529 | /* cancel this outright */ |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 530 | status = DLM_NORMAL; |
| 531 | *actions = (DLM_UNLOCK_CALL_AST | |
| 532 | DLM_UNLOCK_REMOVE_LOCK); |
| 533 | } else if (dlm_lock_on_list(&res->converting, lock)) { |
| 534 | /* cancel the request, put back on granted */ |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 535 | status = DLM_NORMAL; |
| 536 | *actions = (DLM_UNLOCK_CALL_AST | |
| 537 | DLM_UNLOCK_REMOVE_LOCK | |
| 538 | DLM_UNLOCK_REGRANT_LOCK | |
| 539 | DLM_UNLOCK_CLEAR_CONVERT_TYPE); |
| 540 | } else if (dlm_lock_on_list(&res->granted, lock)) { |
Kurt Hackel | a23eac9 | 2006-06-18 21:28:01 -0700 | [diff] [blame] | 541 | /* too late, already granted. */ |
| 542 | status = DLM_CANCELGRANT; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 543 | *actions = DLM_UNLOCK_CALL_AST; |
| 544 | } else { |
| 545 | mlog(ML_ERROR, "lock to cancel is not on any list!\n"); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 546 | status = DLM_IVLOCKID; |
| 547 | *actions = 0; |
| 548 | } |
| 549 | return status; |
| 550 | } |
| 551 | |
| 552 | static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, |
| 553 | struct dlm_lock_resource *res, |
| 554 | struct dlm_lock *lock, |
| 555 | struct dlm_lockstatus *lksb, |
| 556 | int *actions) |
| 557 | { |
| 558 | enum dlm_status status; |
| 559 | |
| 560 | /* unlock request */ |
| 561 | if (!dlm_lock_on_list(&res->granted, lock)) { |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 562 | status = DLM_DENIED; |
| 563 | dlm_error(status); |
| 564 | *actions = 0; |
| 565 | } else { |
| 566 | /* unlock granted lock */ |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 567 | status = DLM_NORMAL; |
| 568 | *actions = (DLM_UNLOCK_FREE_LOCK | |
| 569 | DLM_UNLOCK_CALL_AST | |
| 570 | DLM_UNLOCK_REMOVE_LOCK); |
| 571 | } |
| 572 | return status; |
| 573 | } |
| 574 | |
| 575 | /* there seems to be no point in doing this async |
| 576 | * since (even for the remote case) there is really |
| 577 | * no work to queue up... so just do it and fire the |
| 578 | * unlockast by hand when done... */ |
| 579 | enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb, |
| 580 | int flags, dlm_astunlockfunc_t *unlockast, void *data) |
| 581 | { |
| 582 | enum dlm_status status; |
| 583 | struct dlm_lock_resource *res; |
| 584 | struct dlm_lock *lock = NULL; |
| 585 | int call_ast, is_master; |
| 586 | |
| 587 | mlog_entry_void(); |
| 588 | |
| 589 | if (!lksb) { |
| 590 | dlm_error(DLM_BADARGS); |
| 591 | return DLM_BADARGS; |
| 592 | } |
| 593 | |
| 594 | if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) { |
| 595 | dlm_error(DLM_BADPARAM); |
| 596 | return DLM_BADPARAM; |
| 597 | } |
| 598 | |
| 599 | if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) { |
| 600 | mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n"); |
| 601 | flags &= ~LKM_VALBLK; |
| 602 | } |
| 603 | |
| 604 | if (!lksb->lockid || !lksb->lockid->lockres) { |
| 605 | dlm_error(DLM_BADPARAM); |
| 606 | return DLM_BADPARAM; |
| 607 | } |
| 608 | |
| 609 | lock = lksb->lockid; |
| 610 | BUG_ON(!lock); |
| 611 | dlm_lock_get(lock); |
| 612 | |
| 613 | res = lock->lockres; |
| 614 | BUG_ON(!res); |
| 615 | dlm_lockres_get(res); |
| 616 | retry: |
| 617 | call_ast = 0; |
| 618 | /* need to retry up here because owner may have changed */ |
| 619 | mlog(0, "lock=%p res=%p\n", lock, res); |
| 620 | |
| 621 | spin_lock(&res->spinlock); |
| 622 | is_master = (res->owner == dlm->node_num); |
Kurt Hackel | 4b1af77 | 2006-06-26 15:17:47 -0700 | [diff] [blame] | 623 | if (flags & LKM_VALBLK && lock->ml.type != LKM_EXMODE) |
| 624 | flags &= ~LKM_VALBLK; |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 625 | spin_unlock(&res->spinlock); |
| 626 | |
| 627 | if (is_master) { |
| 628 | status = dlmunlock_master(dlm, res, lock, lksb, flags, |
| 629 | &call_ast); |
| 630 | mlog(0, "done calling dlmunlock_master: returned %d, " |
| 631 | "call_ast is %d\n", status, call_ast); |
| 632 | } else { |
| 633 | status = dlmunlock_remote(dlm, res, lock, lksb, flags, |
| 634 | &call_ast); |
| 635 | mlog(0, "done calling dlmunlock_remote: returned %d, " |
| 636 | "call_ast is %d\n", status, call_ast); |
| 637 | } |
| 638 | |
| 639 | if (status == DLM_RECOVERING || |
| 640 | status == DLM_MIGRATING || |
| 641 | status == DLM_FORWARD) { |
| 642 | /* We want to go away for a tiny bit to allow recovery |
| 643 | * / migration to complete on this resource. I don't |
| 644 | * know of any wait queue we could sleep on as this |
| 645 | * may be happening on another node. Perhaps the |
| 646 | * proper solution is to queue up requests on the |
| 647 | * other end? */ |
| 648 | |
| 649 | /* do we want to yield(); ?? */ |
| 650 | msleep(50); |
| 651 | |
| 652 | mlog(0, "retrying unlock due to pending recovery/" |
| 653 | "migration/in-progress\n"); |
| 654 | goto retry; |
| 655 | } |
| 656 | |
| 657 | if (call_ast) { |
Kurt Hackel | a23eac9 | 2006-06-18 21:28:01 -0700 | [diff] [blame] | 658 | mlog(0, "calling unlockast(%p, %d)\n", data, status); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 659 | if (is_master) { |
| 660 | /* it is possible that there is one last bast |
| 661 | * pending. make sure it is flushed, then |
| 662 | * call the unlockast. |
| 663 | * not an issue if this is a mastered remotely, |
| 664 | * since this lock has been removed from the |
| 665 | * lockres queues and cannot be found. */ |
| 666 | dlm_kick_thread(dlm, NULL); |
| 667 | wait_event(dlm->ast_wq, |
| 668 | dlm_lock_basts_flushed(dlm, lock)); |
| 669 | } |
Kurt Hackel | a23eac9 | 2006-06-18 21:28:01 -0700 | [diff] [blame] | 670 | (*unlockast)(data, status); |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 671 | } |
| 672 | |
Kurt Hackel | a23eac9 | 2006-06-18 21:28:01 -0700 | [diff] [blame] | 673 | if (status == DLM_CANCELGRANT) |
| 674 | status = DLM_NORMAL; |
| 675 | |
Kurt Hackel | 6714d8e | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 676 | if (status == DLM_NORMAL) { |
| 677 | mlog(0, "kicking the thread\n"); |
| 678 | dlm_kick_thread(dlm, res); |
| 679 | } else |
| 680 | dlm_error(status); |
| 681 | |
| 682 | dlm_lockres_calc_usage(dlm, res); |
| 683 | dlm_lockres_put(res); |
| 684 | dlm_lock_put(lock); |
| 685 | |
| 686 | mlog(0, "returning status=%d!\n", status); |
| 687 | return status; |
| 688 | } |
| 689 | EXPORT_SYMBOL_GPL(dlmunlock); |
| 690 | |