dlmglue.c revision f9e2d82e6395cfa0802446b54b63cc412089d82c
1/* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * dlmglue.c 5 * 6 * Code which implements an OCFS2 specific interface to our DLM. 7 * 8 * Copyright (C) 2003, 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#include <linux/types.h> 27#include <linux/slab.h> 28#include <linux/highmem.h> 29#include <linux/mm.h> 30#include <linux/smp_lock.h> 31#include <linux/crc32.h> 32#include <linux/kthread.h> 33#include <linux/pagemap.h> 34#include <linux/debugfs.h> 35#include <linux/seq_file.h> 36 37#include <cluster/heartbeat.h> 38#include <cluster/nodemanager.h> 39#include <cluster/tcp.h> 40 41#include <dlm/dlmapi.h> 42 43#define MLOG_MASK_PREFIX ML_DLM_GLUE 44#include <cluster/masklog.h> 45 46#include "ocfs2.h" 47 48#include "alloc.h" 49#include "dcache.h" 50#include "dlmglue.h" 51#include "extent_map.h" 52#include "heartbeat.h" 53#include "inode.h" 54#include "journal.h" 55#include "slot_map.h" 56#include "super.h" 57#include "uptodate.h" 58#include "vote.h" 59 60#include "buffer_head_io.h" 61 62struct ocfs2_mask_waiter { 63 struct list_head mw_item; 64 int mw_status; 65 struct completion mw_complete; 66 unsigned long mw_mask; 67 unsigned long mw_goal; 68}; 69 70static void ocfs2_inode_ast_func(void *opaque); 71static void ocfs2_inode_bast_func(void *opaque, 72 int level); 73static void ocfs2_dentry_ast_func(void *opaque); 74static void ocfs2_dentry_bast_func(void *opaque, 75 int level); 76static void ocfs2_super_ast_func(void *opaque); 77static void ocfs2_super_bast_func(void *opaque, 78 int level); 79static void ocfs2_rename_ast_func(void *opaque); 80static void ocfs2_rename_bast_func(void *opaque, 81 int level); 82 83/* 84 * Return value from ocfs2_convert_worker_t functions. 85 * 86 * These control the precise actions of ocfs2_generic_unblock_lock() 87 * and ocfs2_process_blocked_lock() 88 * 89 */ 90enum ocfs2_unblock_action { 91 UNBLOCK_CONTINUE = 0, /* Continue downconvert */ 92 UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire 93 * ->post_unlock callback */ 94 UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire 95 * ->post_unlock() callback. */ 96}; 97 98struct ocfs2_unblock_ctl { 99 int requeue; 100 enum ocfs2_unblock_action unblock_action; 101}; 102 103/* so far, all locks have gotten along with the same unlock ast */ 104static void ocfs2_unlock_ast_func(void *opaque, 105 enum dlm_status status); 106static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, 107 struct ocfs2_unblock_ctl *ctl); 108static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, 109 struct ocfs2_unblock_ctl *ctl); 110static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, 111 struct ocfs2_unblock_ctl *ctl); 112static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres, 113 struct ocfs2_unblock_ctl *ctl); 114static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, 115 struct ocfs2_unblock_ctl *ctl); 116 117static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, 118 struct ocfs2_lock_res *lockres); 119 120struct ocfs2_lock_res_ops { 121 void (*ast)(void *); 122 void (*bast)(void *, int); 123 void (*unlock_ast)(void *, enum dlm_status); 124 int (*unblock)(struct ocfs2_lock_res *, struct ocfs2_unblock_ctl *); 125 void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); 126}; 127 128typedef int (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int); 129static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, 130 struct ocfs2_lock_res *lockres, 131 struct ocfs2_unblock_ctl *ctl, 132 ocfs2_convert_worker_t *worker); 133 134static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { 135 .ast = ocfs2_inode_ast_func, 136 .bast = ocfs2_inode_bast_func, 137 .unlock_ast = ocfs2_unlock_ast_func, 138 .unblock = ocfs2_unblock_inode_lock, 139}; 140 141static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = { 142 .ast = ocfs2_inode_ast_func, 143 .bast = ocfs2_inode_bast_func, 144 .unlock_ast = ocfs2_unlock_ast_func, 145 .unblock = ocfs2_unblock_meta, 146}; 147 148static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = { 149 .ast = ocfs2_inode_ast_func, 150 .bast = ocfs2_inode_bast_func, 151 .unlock_ast = ocfs2_unlock_ast_func, 152 .unblock = ocfs2_unblock_data, 153}; 154 155static struct ocfs2_lock_res_ops ocfs2_super_lops = { 156 .ast = ocfs2_super_ast_func, 157 .bast = ocfs2_super_bast_func, 158 .unlock_ast = ocfs2_unlock_ast_func, 159 .unblock = ocfs2_unblock_osb_lock, 160}; 161 162static struct ocfs2_lock_res_ops ocfs2_rename_lops = { 163 .ast = ocfs2_rename_ast_func, 164 .bast = ocfs2_rename_bast_func, 165 .unlock_ast = ocfs2_unlock_ast_func, 166 .unblock = ocfs2_unblock_osb_lock, 167}; 168 169static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { 170 .ast = ocfs2_dentry_ast_func, 171 .bast = ocfs2_dentry_bast_func, 172 .unlock_ast = ocfs2_unlock_ast_func, 173 .unblock = ocfs2_unblock_dentry_lock, 174 .post_unlock = ocfs2_dentry_post_unlock, 175}; 176 177static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) 178{ 179 return lockres->l_type == OCFS2_LOCK_TYPE_META || 180 lockres->l_type == OCFS2_LOCK_TYPE_DATA || 181 lockres->l_type == OCFS2_LOCK_TYPE_RW; 182} 183 184static inline int ocfs2_is_super_lock(struct ocfs2_lock_res *lockres) 185{ 186 return lockres->l_type == OCFS2_LOCK_TYPE_SUPER; 187} 188 189static inline int ocfs2_is_rename_lock(struct ocfs2_lock_res *lockres) 190{ 191 return lockres->l_type == OCFS2_LOCK_TYPE_RENAME; 192} 193 194static inline struct ocfs2_super *ocfs2_lock_res_super(struct ocfs2_lock_res *lockres) 195{ 196 BUG_ON(!ocfs2_is_super_lock(lockres) 197 && !ocfs2_is_rename_lock(lockres)); 198 199 return (struct ocfs2_super *) lockres->l_priv; 200} 201 202static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) 203{ 204 BUG_ON(!ocfs2_is_inode_lock(lockres)); 205 206 return (struct inode *) lockres->l_priv; 207} 208 209static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) 210{ 211 BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); 212 213 return (struct ocfs2_dentry_lock *)lockres->l_priv; 214} 215 216static int ocfs2_lock_create(struct ocfs2_super *osb, 217 struct ocfs2_lock_res *lockres, 218 int level, 219 int dlm_flags); 220static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, 221 int wanted); 222static void ocfs2_cluster_unlock(struct ocfs2_super *osb, 223 struct ocfs2_lock_res *lockres, 224 int level); 225static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); 226static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); 227static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); 228static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); 229static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, 230 struct ocfs2_lock_res *lockres); 231static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, 232 int convert); 233#define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ 234 mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ 235 "resource %s: %s\n", dlm_errname(_stat), _func, \ 236 _lockres->l_name, dlm_errmsg(_stat)); \ 237} while (0) 238static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, 239 struct ocfs2_lock_res *lockres); 240static int ocfs2_meta_lock_update(struct inode *inode, 241 struct buffer_head **bh); 242static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); 243static inline int ocfs2_highest_compat_lock_level(int level); 244static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, 245 struct ocfs2_lock_res *lockres, 246 int new_level); 247 248static void ocfs2_build_lock_name(enum ocfs2_lock_type type, 249 u64 blkno, 250 u32 generation, 251 char *name) 252{ 253 int len; 254 255 mlog_entry_void(); 256 257 BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); 258 259 len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", 260 ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, 261 (long long)blkno, generation); 262 263 BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); 264 265 mlog(0, "built lock resource with name: %s\n", name); 266 267 mlog_exit_void(); 268} 269 270static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); 271 272static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, 273 struct ocfs2_dlm_debug *dlm_debug) 274{ 275 mlog(0, "Add tracking for lockres %s\n", res->l_name); 276 277 spin_lock(&ocfs2_dlm_tracking_lock); 278 list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); 279 spin_unlock(&ocfs2_dlm_tracking_lock); 280} 281 282static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) 283{ 284 spin_lock(&ocfs2_dlm_tracking_lock); 285 if (!list_empty(&res->l_debug_list)) 286 list_del_init(&res->l_debug_list); 287 spin_unlock(&ocfs2_dlm_tracking_lock); 288} 289 290static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, 291 struct ocfs2_lock_res *res, 292 enum ocfs2_lock_type type, 293 struct ocfs2_lock_res_ops *ops, 294 void *priv) 295{ 296 res->l_type = type; 297 res->l_ops = ops; 298 res->l_priv = priv; 299 300 res->l_level = LKM_IVMODE; 301 res->l_requested = LKM_IVMODE; 302 res->l_blocking = LKM_IVMODE; 303 res->l_action = OCFS2_AST_INVALID; 304 res->l_unlock_action = OCFS2_UNLOCK_INVALID; 305 306 res->l_flags = OCFS2_LOCK_INITIALIZED; 307 308 ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); 309} 310 311void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) 312{ 313 /* This also clears out the lock status block */ 314 memset(res, 0, sizeof(struct ocfs2_lock_res)); 315 spin_lock_init(&res->l_lock); 316 init_waitqueue_head(&res->l_event); 317 INIT_LIST_HEAD(&res->l_blocked_list); 318 INIT_LIST_HEAD(&res->l_mask_waiters); 319} 320 321void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, 322 enum ocfs2_lock_type type, 323 struct inode *inode) 324{ 325 struct ocfs2_lock_res_ops *ops; 326 327 switch(type) { 328 case OCFS2_LOCK_TYPE_RW: 329 ops = &ocfs2_inode_rw_lops; 330 break; 331 case OCFS2_LOCK_TYPE_META: 332 ops = &ocfs2_inode_meta_lops; 333 break; 334 case OCFS2_LOCK_TYPE_DATA: 335 ops = &ocfs2_inode_data_lops; 336 break; 337 default: 338 mlog_bug_on_msg(1, "type: %d\n", type); 339 ops = NULL; /* thanks, gcc */ 340 break; 341 }; 342 343 ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, 344 inode->i_generation, res->l_name); 345 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); 346} 347 348static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) 349{ 350 __be64 inode_blkno_be; 351 352 memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], 353 sizeof(__be64)); 354 355 return be64_to_cpu(inode_blkno_be); 356} 357 358void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, 359 u64 parent, struct inode *inode) 360{ 361 int len; 362 u64 inode_blkno = OCFS2_I(inode)->ip_blkno; 363 __be64 inode_blkno_be = cpu_to_be64(inode_blkno); 364 struct ocfs2_lock_res *lockres = &dl->dl_lockres; 365 366 ocfs2_lock_res_init_once(lockres); 367 368 /* 369 * Unfortunately, the standard lock naming scheme won't work 370 * here because we have two 16 byte values to use. Instead, 371 * we'll stuff the inode number as a binary value. We still 372 * want error prints to show something without garbling the 373 * display, so drop a null byte in there before the inode 374 * number. A future version of OCFS2 will likely use all 375 * binary lock names. The stringified names have been a 376 * tremendous aid in debugging, but now that the debugfs 377 * interface exists, we can mangle things there if need be. 378 * 379 * NOTE: We also drop the standard "pad" value (the total lock 380 * name size stays the same though - the last part is all 381 * zeros due to the memset in ocfs2_lock_res_init_once() 382 */ 383 len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, 384 "%c%016llx", 385 ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), 386 (long long)parent); 387 388 BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); 389 390 memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, 391 sizeof(__be64)); 392 393 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, 394 OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, 395 dl); 396} 397 398static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, 399 struct ocfs2_super *osb) 400{ 401 /* Superblock lockres doesn't come from a slab so we call init 402 * once on it manually. */ 403 ocfs2_lock_res_init_once(res); 404 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, 405 0, res->l_name); 406 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, 407 &ocfs2_super_lops, osb); 408} 409 410static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, 411 struct ocfs2_super *osb) 412{ 413 /* Rename lockres doesn't come from a slab so we call init 414 * once on it manually. */ 415 ocfs2_lock_res_init_once(res); 416 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); 417 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, 418 &ocfs2_rename_lops, osb); 419} 420 421void ocfs2_lock_res_free(struct ocfs2_lock_res *res) 422{ 423 mlog_entry_void(); 424 425 if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) 426 return; 427 428 ocfs2_remove_lockres_tracking(res); 429 430 mlog_bug_on_msg(!list_empty(&res->l_blocked_list), 431 "Lockres %s is on the blocked list\n", 432 res->l_name); 433 mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), 434 "Lockres %s has mask waiters pending\n", 435 res->l_name); 436 mlog_bug_on_msg(spin_is_locked(&res->l_lock), 437 "Lockres %s is locked\n", 438 res->l_name); 439 mlog_bug_on_msg(res->l_ro_holders, 440 "Lockres %s has %u ro holders\n", 441 res->l_name, res->l_ro_holders); 442 mlog_bug_on_msg(res->l_ex_holders, 443 "Lockres %s has %u ex holders\n", 444 res->l_name, res->l_ex_holders); 445 446 /* Need to clear out the lock status block for the dlm */ 447 memset(&res->l_lksb, 0, sizeof(res->l_lksb)); 448 449 res->l_flags = 0UL; 450 mlog_exit_void(); 451} 452 453static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, 454 int level) 455{ 456 mlog_entry_void(); 457 458 BUG_ON(!lockres); 459 460 switch(level) { 461 case LKM_EXMODE: 462 lockres->l_ex_holders++; 463 break; 464 case LKM_PRMODE: 465 lockres->l_ro_holders++; 466 break; 467 default: 468 BUG(); 469 } 470 471 mlog_exit_void(); 472} 473 474static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, 475 int level) 476{ 477 mlog_entry_void(); 478 479 BUG_ON(!lockres); 480 481 switch(level) { 482 case LKM_EXMODE: 483 BUG_ON(!lockres->l_ex_holders); 484 lockres->l_ex_holders--; 485 break; 486 case LKM_PRMODE: 487 BUG_ON(!lockres->l_ro_holders); 488 lockres->l_ro_holders--; 489 break; 490 default: 491 BUG(); 492 } 493 mlog_exit_void(); 494} 495 496/* WARNING: This function lives in a world where the only three lock 497 * levels are EX, PR, and NL. It *will* have to be adjusted when more 498 * lock types are added. */ 499static inline int ocfs2_highest_compat_lock_level(int level) 500{ 501 int new_level = LKM_EXMODE; 502 503 if (level == LKM_EXMODE) 504 new_level = LKM_NLMODE; 505 else if (level == LKM_PRMODE) 506 new_level = LKM_PRMODE; 507 return new_level; 508} 509 510static void lockres_set_flags(struct ocfs2_lock_res *lockres, 511 unsigned long newflags) 512{ 513 struct list_head *pos, *tmp; 514 struct ocfs2_mask_waiter *mw; 515 516 assert_spin_locked(&lockres->l_lock); 517 518 lockres->l_flags = newflags; 519 520 list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) { 521 mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item); 522 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) 523 continue; 524 525 list_del_init(&mw->mw_item); 526 mw->mw_status = 0; 527 complete(&mw->mw_complete); 528 } 529} 530static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) 531{ 532 lockres_set_flags(lockres, lockres->l_flags | or); 533} 534static void lockres_clear_flags(struct ocfs2_lock_res *lockres, 535 unsigned long clear) 536{ 537 lockres_set_flags(lockres, lockres->l_flags & ~clear); 538} 539 540static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) 541{ 542 mlog_entry_void(); 543 544 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); 545 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); 546 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); 547 BUG_ON(lockres->l_blocking <= LKM_NLMODE); 548 549 lockres->l_level = lockres->l_requested; 550 if (lockres->l_level <= 551 ocfs2_highest_compat_lock_level(lockres->l_blocking)) { 552 lockres->l_blocking = LKM_NLMODE; 553 lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); 554 } 555 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 556 557 mlog_exit_void(); 558} 559 560static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) 561{ 562 mlog_entry_void(); 563 564 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); 565 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); 566 567 /* Convert from RO to EX doesn't really need anything as our 568 * information is already up to data. Convert from NL to 569 * *anything* however should mark ourselves as needing an 570 * update */ 571 if (lockres->l_level == LKM_NLMODE) 572 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 573 574 lockres->l_level = lockres->l_requested; 575 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 576 577 mlog_exit_void(); 578} 579 580static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) 581{ 582 mlog_entry_void(); 583 584 BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY)); 585 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); 586 587 if (lockres->l_requested > LKM_NLMODE && 588 !(lockres->l_flags & OCFS2_LOCK_LOCAL)) 589 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 590 591 lockres->l_level = lockres->l_requested; 592 lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); 593 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 594 595 mlog_exit_void(); 596} 597 598static void ocfs2_inode_ast_func(void *opaque) 599{ 600 struct ocfs2_lock_res *lockres = opaque; 601 struct inode *inode; 602 struct dlm_lockstatus *lksb; 603 unsigned long flags; 604 605 mlog_entry_void(); 606 607 inode = ocfs2_lock_res_inode(lockres); 608 609 mlog(0, "AST fired for inode %llu, l_action = %u, type = %s\n", 610 (unsigned long long)OCFS2_I(inode)->ip_blkno, lockres->l_action, 611 ocfs2_lock_type_string(lockres->l_type)); 612 613 BUG_ON(!ocfs2_is_inode_lock(lockres)); 614 615 spin_lock_irqsave(&lockres->l_lock, flags); 616 617 lksb = &(lockres->l_lksb); 618 if (lksb->status != DLM_NORMAL) { 619 mlog(ML_ERROR, "ocfs2_inode_ast_func: lksb status value of %u " 620 "on inode %llu\n", lksb->status, 621 (unsigned long long)OCFS2_I(inode)->ip_blkno); 622 spin_unlock_irqrestore(&lockres->l_lock, flags); 623 mlog_exit_void(); 624 return; 625 } 626 627 switch(lockres->l_action) { 628 case OCFS2_AST_ATTACH: 629 ocfs2_generic_handle_attach_action(lockres); 630 lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); 631 break; 632 case OCFS2_AST_CONVERT: 633 ocfs2_generic_handle_convert_action(lockres); 634 break; 635 case OCFS2_AST_DOWNCONVERT: 636 ocfs2_generic_handle_downconvert_action(lockres); 637 break; 638 default: 639 mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " 640 "lockres flags = 0x%lx, unlock action: %u\n", 641 lockres->l_name, lockres->l_action, lockres->l_flags, 642 lockres->l_unlock_action); 643 644 BUG(); 645 } 646 647 /* data and rw locking ignores refresh flag for now. */ 648 if (lockres->l_type != OCFS2_LOCK_TYPE_META) 649 lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 650 651 /* set it to something invalid so if we get called again we 652 * can catch it. */ 653 lockres->l_action = OCFS2_AST_INVALID; 654 spin_unlock_irqrestore(&lockres->l_lock, flags); 655 wake_up(&lockres->l_event); 656 657 mlog_exit_void(); 658} 659 660static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, 661 int level) 662{ 663 int needs_downconvert = 0; 664 mlog_entry_void(); 665 666 assert_spin_locked(&lockres->l_lock); 667 668 lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); 669 670 if (level > lockres->l_blocking) { 671 /* only schedule a downconvert if we haven't already scheduled 672 * one that goes low enough to satisfy the level we're 673 * blocking. this also catches the case where we get 674 * duplicate BASTs */ 675 if (ocfs2_highest_compat_lock_level(level) < 676 ocfs2_highest_compat_lock_level(lockres->l_blocking)) 677 needs_downconvert = 1; 678 679 lockres->l_blocking = level; 680 } 681 682 mlog_exit(needs_downconvert); 683 return needs_downconvert; 684} 685 686static void ocfs2_generic_bast_func(struct ocfs2_super *osb, 687 struct ocfs2_lock_res *lockres, 688 int level) 689{ 690 int needs_downconvert; 691 unsigned long flags; 692 693 mlog_entry_void(); 694 695 BUG_ON(level <= LKM_NLMODE); 696 697 spin_lock_irqsave(&lockres->l_lock, flags); 698 needs_downconvert = ocfs2_generic_handle_bast(lockres, level); 699 if (needs_downconvert) 700 ocfs2_schedule_blocked_lock(osb, lockres); 701 spin_unlock_irqrestore(&lockres->l_lock, flags); 702 703 wake_up(&lockres->l_event); 704 705 ocfs2_kick_vote_thread(osb); 706 707 mlog_exit_void(); 708} 709 710static void ocfs2_inode_bast_func(void *opaque, int level) 711{ 712 struct ocfs2_lock_res *lockres = opaque; 713 struct inode *inode; 714 struct ocfs2_super *osb; 715 716 mlog_entry_void(); 717 718 BUG_ON(!ocfs2_is_inode_lock(lockres)); 719 720 inode = ocfs2_lock_res_inode(lockres); 721 osb = OCFS2_SB(inode->i_sb); 722 723 mlog(0, "BAST fired for inode %llu, blocking %d, level %d type %s\n", 724 (unsigned long long)OCFS2_I(inode)->ip_blkno, level, 725 lockres->l_level, ocfs2_lock_type_string(lockres->l_type)); 726 727 ocfs2_generic_bast_func(osb, lockres, level); 728 729 mlog_exit_void(); 730} 731 732static void ocfs2_generic_ast_func(struct ocfs2_lock_res *lockres, 733 int ignore_refresh) 734{ 735 struct dlm_lockstatus *lksb = &lockres->l_lksb; 736 unsigned long flags; 737 738 spin_lock_irqsave(&lockres->l_lock, flags); 739 740 if (lksb->status != DLM_NORMAL) { 741 mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", 742 lockres->l_name, lksb->status); 743 spin_unlock_irqrestore(&lockres->l_lock, flags); 744 return; 745 } 746 747 switch(lockres->l_action) { 748 case OCFS2_AST_ATTACH: 749 ocfs2_generic_handle_attach_action(lockres); 750 break; 751 case OCFS2_AST_CONVERT: 752 ocfs2_generic_handle_convert_action(lockres); 753 break; 754 case OCFS2_AST_DOWNCONVERT: 755 ocfs2_generic_handle_downconvert_action(lockres); 756 break; 757 default: 758 BUG(); 759 } 760 761 if (ignore_refresh) 762 lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 763 764 /* set it to something invalid so if we get called again we 765 * can catch it. */ 766 lockres->l_action = OCFS2_AST_INVALID; 767 768 wake_up(&lockres->l_event); 769 spin_unlock_irqrestore(&lockres->l_lock, flags); 770} 771 772static void ocfs2_super_ast_func(void *opaque) 773{ 774 struct ocfs2_lock_res *lockres = opaque; 775 776 mlog_entry_void(); 777 mlog(0, "Superblock AST fired\n"); 778 779 BUG_ON(!ocfs2_is_super_lock(lockres)); 780 ocfs2_generic_ast_func(lockres, 0); 781 782 mlog_exit_void(); 783} 784 785static void ocfs2_super_bast_func(void *opaque, 786 int level) 787{ 788 struct ocfs2_lock_res *lockres = opaque; 789 struct ocfs2_super *osb; 790 791 mlog_entry_void(); 792 mlog(0, "Superblock BAST fired\n"); 793 794 BUG_ON(!ocfs2_is_super_lock(lockres)); 795 osb = ocfs2_lock_res_super(lockres); 796 ocfs2_generic_bast_func(osb, lockres, level); 797 798 mlog_exit_void(); 799} 800 801static void ocfs2_rename_ast_func(void *opaque) 802{ 803 struct ocfs2_lock_res *lockres = opaque; 804 805 mlog_entry_void(); 806 807 mlog(0, "Rename AST fired\n"); 808 809 BUG_ON(!ocfs2_is_rename_lock(lockres)); 810 811 ocfs2_generic_ast_func(lockres, 1); 812 813 mlog_exit_void(); 814} 815 816static void ocfs2_rename_bast_func(void *opaque, 817 int level) 818{ 819 struct ocfs2_lock_res *lockres = opaque; 820 struct ocfs2_super *osb; 821 822 mlog_entry_void(); 823 824 mlog(0, "Rename BAST fired\n"); 825 826 BUG_ON(!ocfs2_is_rename_lock(lockres)); 827 828 osb = ocfs2_lock_res_super(lockres); 829 ocfs2_generic_bast_func(osb, lockres, level); 830 831 mlog_exit_void(); 832} 833 834static void ocfs2_dentry_ast_func(void *opaque) 835{ 836 struct ocfs2_lock_res *lockres = opaque; 837 838 BUG_ON(!lockres); 839 840 ocfs2_generic_ast_func(lockres, 1); 841} 842 843static void ocfs2_dentry_bast_func(void *opaque, int level) 844{ 845 struct ocfs2_lock_res *lockres = opaque; 846 struct ocfs2_dentry_lock *dl = lockres->l_priv; 847 struct ocfs2_super *osb = OCFS2_SB(dl->dl_inode->i_sb); 848 849 mlog(0, "Dentry bast: level: %d, name: %s\n", level, 850 lockres->l_name); 851 852 ocfs2_generic_bast_func(osb, lockres, level); 853} 854 855static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, 856 int convert) 857{ 858 unsigned long flags; 859 860 mlog_entry_void(); 861 spin_lock_irqsave(&lockres->l_lock, flags); 862 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 863 if (convert) 864 lockres->l_action = OCFS2_AST_INVALID; 865 else 866 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; 867 spin_unlock_irqrestore(&lockres->l_lock, flags); 868 869 wake_up(&lockres->l_event); 870 mlog_exit_void(); 871} 872 873/* Note: If we detect another process working on the lock (i.e., 874 * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller 875 * to do the right thing in that case. 876 */ 877static int ocfs2_lock_create(struct ocfs2_super *osb, 878 struct ocfs2_lock_res *lockres, 879 int level, 880 int dlm_flags) 881{ 882 int ret = 0; 883 enum dlm_status status; 884 unsigned long flags; 885 886 mlog_entry_void(); 887 888 mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, 889 dlm_flags); 890 891 spin_lock_irqsave(&lockres->l_lock, flags); 892 if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || 893 (lockres->l_flags & OCFS2_LOCK_BUSY)) { 894 spin_unlock_irqrestore(&lockres->l_lock, flags); 895 goto bail; 896 } 897 898 lockres->l_action = OCFS2_AST_ATTACH; 899 lockres->l_requested = level; 900 lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 901 spin_unlock_irqrestore(&lockres->l_lock, flags); 902 903 status = dlmlock(osb->dlm, 904 level, 905 &lockres->l_lksb, 906 dlm_flags, 907 lockres->l_name, 908 OCFS2_LOCK_ID_MAX_LEN - 1, 909 lockres->l_ops->ast, 910 lockres, 911 lockres->l_ops->bast); 912 if (status != DLM_NORMAL) { 913 ocfs2_log_dlm_error("dlmlock", status, lockres); 914 ret = -EINVAL; 915 ocfs2_recover_from_dlm_error(lockres, 1); 916 } 917 918 mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); 919 920bail: 921 mlog_exit(ret); 922 return ret; 923} 924 925static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, 926 int flag) 927{ 928 unsigned long flags; 929 int ret; 930 931 spin_lock_irqsave(&lockres->l_lock, flags); 932 ret = lockres->l_flags & flag; 933 spin_unlock_irqrestore(&lockres->l_lock, flags); 934 935 return ret; 936} 937 938static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) 939 940{ 941 wait_event(lockres->l_event, 942 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); 943} 944 945static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) 946 947{ 948 wait_event(lockres->l_event, 949 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); 950} 951 952/* predict what lock level we'll be dropping down to on behalf 953 * of another node, and return true if the currently wanted 954 * level will be compatible with it. */ 955static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, 956 int wanted) 957{ 958 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); 959 960 return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); 961} 962 963static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) 964{ 965 INIT_LIST_HEAD(&mw->mw_item); 966 init_completion(&mw->mw_complete); 967} 968 969static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) 970{ 971 wait_for_completion(&mw->mw_complete); 972 /* Re-arm the completion in case we want to wait on it again */ 973 INIT_COMPLETION(mw->mw_complete); 974 return mw->mw_status; 975} 976 977static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, 978 struct ocfs2_mask_waiter *mw, 979 unsigned long mask, 980 unsigned long goal) 981{ 982 BUG_ON(!list_empty(&mw->mw_item)); 983 984 assert_spin_locked(&lockres->l_lock); 985 986 list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); 987 mw->mw_mask = mask; 988 mw->mw_goal = goal; 989} 990 991/* returns 0 if the mw that was removed was already satisfied, -EBUSY 992 * if the mask still hadn't reached its goal */ 993static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, 994 struct ocfs2_mask_waiter *mw) 995{ 996 unsigned long flags; 997 int ret = 0; 998 999 spin_lock_irqsave(&lockres->l_lock, flags); 1000 if (!list_empty(&mw->mw_item)) { 1001 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) 1002 ret = -EBUSY; 1003 1004 list_del_init(&mw->mw_item); 1005 init_completion(&mw->mw_complete); 1006 } 1007 spin_unlock_irqrestore(&lockres->l_lock, flags); 1008 1009 return ret; 1010 1011} 1012 1013static int ocfs2_cluster_lock(struct ocfs2_super *osb, 1014 struct ocfs2_lock_res *lockres, 1015 int level, 1016 int lkm_flags, 1017 int arg_flags) 1018{ 1019 struct ocfs2_mask_waiter mw; 1020 enum dlm_status status; 1021 int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); 1022 int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ 1023 unsigned long flags; 1024 1025 mlog_entry_void(); 1026 1027 ocfs2_init_mask_waiter(&mw); 1028 1029again: 1030 wait = 0; 1031 1032 if (catch_signals && signal_pending(current)) { 1033 ret = -ERESTARTSYS; 1034 goto out; 1035 } 1036 1037 spin_lock_irqsave(&lockres->l_lock, flags); 1038 1039 mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, 1040 "Cluster lock called on freeing lockres %s! flags " 1041 "0x%lx\n", lockres->l_name, lockres->l_flags); 1042 1043 /* We only compare against the currently granted level 1044 * here. If the lock is blocked waiting on a downconvert, 1045 * we'll get caught below. */ 1046 if (lockres->l_flags & OCFS2_LOCK_BUSY && 1047 level > lockres->l_level) { 1048 /* is someone sitting in dlm_lock? If so, wait on 1049 * them. */ 1050 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); 1051 wait = 1; 1052 goto unlock; 1053 } 1054 1055 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { 1056 /* lock has not been created yet. */ 1057 spin_unlock_irqrestore(&lockres->l_lock, flags); 1058 1059 ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0); 1060 if (ret < 0) { 1061 mlog_errno(ret); 1062 goto out; 1063 } 1064 goto again; 1065 } 1066 1067 if (lockres->l_flags & OCFS2_LOCK_BLOCKED && 1068 !ocfs2_may_continue_on_blocked_lock(lockres, level)) { 1069 /* is the lock is currently blocked on behalf of 1070 * another node */ 1071 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); 1072 wait = 1; 1073 goto unlock; 1074 } 1075 1076 if (level > lockres->l_level) { 1077 if (lockres->l_action != OCFS2_AST_INVALID) 1078 mlog(ML_ERROR, "lockres %s has action %u pending\n", 1079 lockres->l_name, lockres->l_action); 1080 1081 lockres->l_action = OCFS2_AST_CONVERT; 1082 lockres->l_requested = level; 1083 lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 1084 spin_unlock_irqrestore(&lockres->l_lock, flags); 1085 1086 BUG_ON(level == LKM_IVMODE); 1087 BUG_ON(level == LKM_NLMODE); 1088 1089 mlog(0, "lock %s, convert from %d to level = %d\n", 1090 lockres->l_name, lockres->l_level, level); 1091 1092 /* call dlm_lock to upgrade lock now */ 1093 status = dlmlock(osb->dlm, 1094 level, 1095 &lockres->l_lksb, 1096 lkm_flags|LKM_CONVERT|LKM_VALBLK, 1097 lockres->l_name, 1098 OCFS2_LOCK_ID_MAX_LEN - 1, 1099 lockres->l_ops->ast, 1100 lockres, 1101 lockres->l_ops->bast); 1102 if (status != DLM_NORMAL) { 1103 if ((lkm_flags & LKM_NOQUEUE) && 1104 (status == DLM_NOTQUEUED)) 1105 ret = -EAGAIN; 1106 else { 1107 ocfs2_log_dlm_error("dlmlock", status, 1108 lockres); 1109 ret = -EINVAL; 1110 } 1111 ocfs2_recover_from_dlm_error(lockres, 1); 1112 goto out; 1113 } 1114 1115 mlog(0, "lock %s, successfull return from dlmlock\n", 1116 lockres->l_name); 1117 1118 /* At this point we've gone inside the dlm and need to 1119 * complete our work regardless. */ 1120 catch_signals = 0; 1121 1122 /* wait for busy to clear and carry on */ 1123 goto again; 1124 } 1125 1126 /* Ok, if we get here then we're good to go. */ 1127 ocfs2_inc_holders(lockres, level); 1128 1129 ret = 0; 1130unlock: 1131 spin_unlock_irqrestore(&lockres->l_lock, flags); 1132out: 1133 /* 1134 * This is helping work around a lock inversion between the page lock 1135 * and dlm locks. One path holds the page lock while calling aops 1136 * which block acquiring dlm locks. The voting thread holds dlm 1137 * locks while acquiring page locks while down converting data locks. 1138 * This block is helping an aop path notice the inversion and back 1139 * off to unlock its page lock before trying the dlm lock again. 1140 */ 1141 if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && 1142 mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { 1143 wait = 0; 1144 if (lockres_remove_mask_waiter(lockres, &mw)) 1145 ret = -EAGAIN; 1146 else 1147 goto again; 1148 } 1149 if (wait) { 1150 ret = ocfs2_wait_for_mask(&mw); 1151 if (ret == 0) 1152 goto again; 1153 mlog_errno(ret); 1154 } 1155 1156 mlog_exit(ret); 1157 return ret; 1158} 1159 1160static void ocfs2_cluster_unlock(struct ocfs2_super *osb, 1161 struct ocfs2_lock_res *lockres, 1162 int level) 1163{ 1164 unsigned long flags; 1165 1166 mlog_entry_void(); 1167 spin_lock_irqsave(&lockres->l_lock, flags); 1168 ocfs2_dec_holders(lockres, level); 1169 ocfs2_vote_on_unlock(osb, lockres); 1170 spin_unlock_irqrestore(&lockres->l_lock, flags); 1171 mlog_exit_void(); 1172} 1173 1174int ocfs2_create_new_lock(struct ocfs2_super *osb, 1175 struct ocfs2_lock_res *lockres, 1176 int ex) 1177{ 1178 int level = ex ? LKM_EXMODE : LKM_PRMODE; 1179 unsigned long flags; 1180 1181 spin_lock_irqsave(&lockres->l_lock, flags); 1182 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); 1183 lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); 1184 spin_unlock_irqrestore(&lockres->l_lock, flags); 1185 1186 return ocfs2_lock_create(osb, lockres, level, LKM_LOCAL); 1187} 1188 1189/* Grants us an EX lock on the data and metadata resources, skipping 1190 * the normal cluster directory lookup. Use this ONLY on newly created 1191 * inodes which other nodes can't possibly see, and which haven't been 1192 * hashed in the inode hash yet. This can give us a good performance 1193 * increase as it'll skip the network broadcast normally associated 1194 * with creating a new lock resource. */ 1195int ocfs2_create_new_inode_locks(struct inode *inode) 1196{ 1197 int ret; 1198 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1199 1200 BUG_ON(!inode); 1201 BUG_ON(!ocfs2_inode_is_new(inode)); 1202 1203 mlog_entry_void(); 1204 1205 mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); 1206 1207 /* NOTE: That we don't increment any of the holder counts, nor 1208 * do we add anything to a journal handle. Since this is 1209 * supposed to be a new inode which the cluster doesn't know 1210 * about yet, there is no need to. As far as the LVB handling 1211 * is concerned, this is basically like acquiring an EX lock 1212 * on a resource which has an invalid one -- we'll set it 1213 * valid when we release the EX. */ 1214 1215 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1); 1216 if (ret) { 1217 mlog_errno(ret); 1218 goto bail; 1219 } 1220 1221 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1); 1222 if (ret) { 1223 mlog_errno(ret); 1224 goto bail; 1225 } 1226 1227 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1); 1228 if (ret) { 1229 mlog_errno(ret); 1230 goto bail; 1231 } 1232 1233bail: 1234 mlog_exit(ret); 1235 return ret; 1236} 1237 1238int ocfs2_rw_lock(struct inode *inode, int write) 1239{ 1240 int status, level; 1241 struct ocfs2_lock_res *lockres; 1242 1243 BUG_ON(!inode); 1244 1245 mlog_entry_void(); 1246 1247 mlog(0, "inode %llu take %s RW lock\n", 1248 (unsigned long long)OCFS2_I(inode)->ip_blkno, 1249 write ? "EXMODE" : "PRMODE"); 1250 1251 lockres = &OCFS2_I(inode)->ip_rw_lockres; 1252 1253 level = write ? LKM_EXMODE : LKM_PRMODE; 1254 1255 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, 1256 0); 1257 if (status < 0) 1258 mlog_errno(status); 1259 1260 mlog_exit(status); 1261 return status; 1262} 1263 1264void ocfs2_rw_unlock(struct inode *inode, int write) 1265{ 1266 int level = write ? LKM_EXMODE : LKM_PRMODE; 1267 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; 1268 1269 mlog_entry_void(); 1270 1271 mlog(0, "inode %llu drop %s RW lock\n", 1272 (unsigned long long)OCFS2_I(inode)->ip_blkno, 1273 write ? "EXMODE" : "PRMODE"); 1274 1275 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); 1276 1277 mlog_exit_void(); 1278} 1279 1280int ocfs2_data_lock_full(struct inode *inode, 1281 int write, 1282 int arg_flags) 1283{ 1284 int status = 0, level; 1285 struct ocfs2_lock_res *lockres; 1286 1287 BUG_ON(!inode); 1288 1289 mlog_entry_void(); 1290 1291 mlog(0, "inode %llu take %s DATA lock\n", 1292 (unsigned long long)OCFS2_I(inode)->ip_blkno, 1293 write ? "EXMODE" : "PRMODE"); 1294 1295 /* We'll allow faking a readonly data lock for 1296 * rodevices. */ 1297 if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) { 1298 if (write) { 1299 status = -EROFS; 1300 mlog_errno(status); 1301 } 1302 goto out; 1303 } 1304 1305 lockres = &OCFS2_I(inode)->ip_data_lockres; 1306 1307 level = write ? LKM_EXMODE : LKM_PRMODE; 1308 1309 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 1310 0, arg_flags); 1311 if (status < 0 && status != -EAGAIN) 1312 mlog_errno(status); 1313 1314out: 1315 mlog_exit(status); 1316 return status; 1317} 1318 1319/* see ocfs2_meta_lock_with_page() */ 1320int ocfs2_data_lock_with_page(struct inode *inode, 1321 int write, 1322 struct page *page) 1323{ 1324 int ret; 1325 1326 ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK); 1327 if (ret == -EAGAIN) { 1328 unlock_page(page); 1329 if (ocfs2_data_lock(inode, write) == 0) 1330 ocfs2_data_unlock(inode, write); 1331 ret = AOP_TRUNCATED_PAGE; 1332 } 1333 1334 return ret; 1335} 1336 1337static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, 1338 struct ocfs2_lock_res *lockres) 1339{ 1340 int kick = 0; 1341 1342 mlog_entry_void(); 1343 1344 /* If we know that another node is waiting on our lock, kick 1345 * the vote thread * pre-emptively when we reach a release 1346 * condition. */ 1347 if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { 1348 switch(lockres->l_blocking) { 1349 case LKM_EXMODE: 1350 if (!lockres->l_ex_holders && !lockres->l_ro_holders) 1351 kick = 1; 1352 break; 1353 case LKM_PRMODE: 1354 if (!lockres->l_ex_holders) 1355 kick = 1; 1356 break; 1357 default: 1358 BUG(); 1359 } 1360 } 1361 1362 if (kick) 1363 ocfs2_kick_vote_thread(osb); 1364 1365 mlog_exit_void(); 1366} 1367 1368void ocfs2_data_unlock(struct inode *inode, 1369 int write) 1370{ 1371 int level = write ? LKM_EXMODE : LKM_PRMODE; 1372 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres; 1373 1374 mlog_entry_void(); 1375 1376 mlog(0, "inode %llu drop %s DATA lock\n", 1377 (unsigned long long)OCFS2_I(inode)->ip_blkno, 1378 write ? "EXMODE" : "PRMODE"); 1379 1380 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) 1381 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); 1382 1383 mlog_exit_void(); 1384} 1385 1386#define OCFS2_SEC_BITS 34 1387#define OCFS2_SEC_SHIFT (64 - 34) 1388#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) 1389 1390/* LVB only has room for 64 bits of time here so we pack it for 1391 * now. */ 1392static u64 ocfs2_pack_timespec(struct timespec *spec) 1393{ 1394 u64 res; 1395 u64 sec = spec->tv_sec; 1396 u32 nsec = spec->tv_nsec; 1397 1398 res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); 1399 1400 return res; 1401} 1402 1403/* Call this with the lockres locked. I am reasonably sure we don't 1404 * need ip_lock in this function as anyone who would be changing those 1405 * values is supposed to be blocked in ocfs2_meta_lock right now. */ 1406static void __ocfs2_stuff_meta_lvb(struct inode *inode) 1407{ 1408 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1409 struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; 1410 struct ocfs2_meta_lvb *lvb; 1411 1412 mlog_entry_void(); 1413 1414 lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 1415 1416 lvb->lvb_version = OCFS2_LVB_VERSION; 1417 lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); 1418 lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); 1419 lvb->lvb_iuid = cpu_to_be32(inode->i_uid); 1420 lvb->lvb_igid = cpu_to_be32(inode->i_gid); 1421 lvb->lvb_imode = cpu_to_be16(inode->i_mode); 1422 lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); 1423 lvb->lvb_iatime_packed = 1424 cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); 1425 lvb->lvb_ictime_packed = 1426 cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); 1427 lvb->lvb_imtime_packed = 1428 cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); 1429 lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); 1430 lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); 1431 1432 mlog_meta_lvb(0, lockres); 1433 1434 mlog_exit_void(); 1435} 1436 1437static void ocfs2_unpack_timespec(struct timespec *spec, 1438 u64 packed_time) 1439{ 1440 spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; 1441 spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; 1442} 1443 1444static void ocfs2_refresh_inode_from_lvb(struct inode *inode) 1445{ 1446 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1447 struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; 1448 struct ocfs2_meta_lvb *lvb; 1449 1450 mlog_entry_void(); 1451 1452 mlog_meta_lvb(0, lockres); 1453 1454 lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 1455 1456 /* We're safe here without the lockres lock... */ 1457 spin_lock(&oi->ip_lock); 1458 oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); 1459 i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); 1460 1461 oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); 1462 ocfs2_set_inode_flags(inode); 1463 1464 /* fast-symlinks are a special case */ 1465 if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) 1466 inode->i_blocks = 0; 1467 else 1468 inode->i_blocks = 1469 ocfs2_align_bytes_to_sectors(i_size_read(inode)); 1470 1471 inode->i_uid = be32_to_cpu(lvb->lvb_iuid); 1472 inode->i_gid = be32_to_cpu(lvb->lvb_igid); 1473 inode->i_mode = be16_to_cpu(lvb->lvb_imode); 1474 inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); 1475 ocfs2_unpack_timespec(&inode->i_atime, 1476 be64_to_cpu(lvb->lvb_iatime_packed)); 1477 ocfs2_unpack_timespec(&inode->i_mtime, 1478 be64_to_cpu(lvb->lvb_imtime_packed)); 1479 ocfs2_unpack_timespec(&inode->i_ctime, 1480 be64_to_cpu(lvb->lvb_ictime_packed)); 1481 spin_unlock(&oi->ip_lock); 1482 1483 mlog_exit_void(); 1484} 1485 1486static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, 1487 struct ocfs2_lock_res *lockres) 1488{ 1489 struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 1490 1491 if (lvb->lvb_version == OCFS2_LVB_VERSION 1492 && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) 1493 return 1; 1494 return 0; 1495} 1496 1497/* Determine whether a lock resource needs to be refreshed, and 1498 * arbitrate who gets to refresh it. 1499 * 1500 * 0 means no refresh needed. 1501 * 1502 * > 0 means you need to refresh this and you MUST call 1503 * ocfs2_complete_lock_res_refresh afterwards. */ 1504static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) 1505{ 1506 unsigned long flags; 1507 int status = 0; 1508 1509 mlog_entry_void(); 1510 1511refresh_check: 1512 spin_lock_irqsave(&lockres->l_lock, flags); 1513 if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { 1514 spin_unlock_irqrestore(&lockres->l_lock, flags); 1515 goto bail; 1516 } 1517 1518 if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { 1519 spin_unlock_irqrestore(&lockres->l_lock, flags); 1520 1521 ocfs2_wait_on_refreshing_lock(lockres); 1522 goto refresh_check; 1523 } 1524 1525 /* Ok, I'll be the one to refresh this lock. */ 1526 lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); 1527 spin_unlock_irqrestore(&lockres->l_lock, flags); 1528 1529 status = 1; 1530bail: 1531 mlog_exit(status); 1532 return status; 1533} 1534 1535/* If status is non zero, I'll mark it as not being in refresh 1536 * anymroe, but i won't clear the needs refresh flag. */ 1537static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, 1538 int status) 1539{ 1540 unsigned long flags; 1541 mlog_entry_void(); 1542 1543 spin_lock_irqsave(&lockres->l_lock, flags); 1544 lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); 1545 if (!status) 1546 lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 1547 spin_unlock_irqrestore(&lockres->l_lock, flags); 1548 1549 wake_up(&lockres->l_event); 1550 1551 mlog_exit_void(); 1552} 1553 1554/* may or may not return a bh if it went to disk. */ 1555static int ocfs2_meta_lock_update(struct inode *inode, 1556 struct buffer_head **bh) 1557{ 1558 int status = 0; 1559 struct ocfs2_inode_info *oi = OCFS2_I(inode); 1560 struct ocfs2_lock_res *lockres; 1561 struct ocfs2_dinode *fe; 1562 1563 mlog_entry_void(); 1564 1565 spin_lock(&oi->ip_lock); 1566 if (oi->ip_flags & OCFS2_INODE_DELETED) { 1567 mlog(0, "Orphaned inode %llu was deleted while we " 1568 "were waiting on a lock. ip_flags = 0x%x\n", 1569 (unsigned long long)oi->ip_blkno, oi->ip_flags); 1570 spin_unlock(&oi->ip_lock); 1571 status = -ENOENT; 1572 goto bail; 1573 } 1574 spin_unlock(&oi->ip_lock); 1575 1576 lockres = &oi->ip_meta_lockres; 1577 1578 if (!ocfs2_should_refresh_lock_res(lockres)) 1579 goto bail; 1580 1581 /* This will discard any caching information we might have had 1582 * for the inode metadata. */ 1583 ocfs2_metadata_cache_purge(inode); 1584 1585 /* will do nothing for inode types that don't use the extent 1586 * map (directories, bitmap files, etc) */ 1587 ocfs2_extent_map_trunc(inode, 0); 1588 1589 if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { 1590 mlog(0, "Trusting LVB on inode %llu\n", 1591 (unsigned long long)oi->ip_blkno); 1592 ocfs2_refresh_inode_from_lvb(inode); 1593 } else { 1594 /* Boo, we have to go to disk. */ 1595 /* read bh, cast, ocfs2_refresh_inode */ 1596 status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, 1597 bh, OCFS2_BH_CACHED, inode); 1598 if (status < 0) { 1599 mlog_errno(status); 1600 goto bail_refresh; 1601 } 1602 fe = (struct ocfs2_dinode *) (*bh)->b_data; 1603 1604 /* This is a good chance to make sure we're not 1605 * locking an invalid object. 1606 * 1607 * We bug on a stale inode here because we checked 1608 * above whether it was wiped from disk. The wiping 1609 * node provides a guarantee that we receive that 1610 * message and can mark the inode before dropping any 1611 * locks associated with it. */ 1612 if (!OCFS2_IS_VALID_DINODE(fe)) { 1613 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); 1614 status = -EIO; 1615 goto bail_refresh; 1616 } 1617 mlog_bug_on_msg(inode->i_generation != 1618 le32_to_cpu(fe->i_generation), 1619 "Invalid dinode %llu disk generation: %u " 1620 "inode->i_generation: %u\n", 1621 (unsigned long long)oi->ip_blkno, 1622 le32_to_cpu(fe->i_generation), 1623 inode->i_generation); 1624 mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || 1625 !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), 1626 "Stale dinode %llu dtime: %llu flags: 0x%x\n", 1627 (unsigned long long)oi->ip_blkno, 1628 (unsigned long long)le64_to_cpu(fe->i_dtime), 1629 le32_to_cpu(fe->i_flags)); 1630 1631 ocfs2_refresh_inode(inode, fe); 1632 } 1633 1634 status = 0; 1635bail_refresh: 1636 ocfs2_complete_lock_res_refresh(lockres, status); 1637bail: 1638 mlog_exit(status); 1639 return status; 1640} 1641 1642static int ocfs2_assign_bh(struct inode *inode, 1643 struct buffer_head **ret_bh, 1644 struct buffer_head *passed_bh) 1645{ 1646 int status; 1647 1648 if (passed_bh) { 1649 /* Ok, the update went to disk for us, use the 1650 * returned bh. */ 1651 *ret_bh = passed_bh; 1652 get_bh(*ret_bh); 1653 1654 return 0; 1655 } 1656 1657 status = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1658 OCFS2_I(inode)->ip_blkno, 1659 ret_bh, 1660 OCFS2_BH_CACHED, 1661 inode); 1662 if (status < 0) 1663 mlog_errno(status); 1664 1665 return status; 1666} 1667 1668/* 1669 * returns < 0 error if the callback will never be called, otherwise 1670 * the result of the lock will be communicated via the callback. 1671 */ 1672int ocfs2_meta_lock_full(struct inode *inode, 1673 struct ocfs2_journal_handle *handle, 1674 struct buffer_head **ret_bh, 1675 int ex, 1676 int arg_flags) 1677{ 1678 int status, level, dlm_flags, acquired; 1679 struct ocfs2_lock_res *lockres; 1680 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1681 struct buffer_head *local_bh = NULL; 1682 1683 BUG_ON(!inode); 1684 1685 mlog_entry_void(); 1686 1687 mlog(0, "inode %llu, take %s META lock\n", 1688 (unsigned long long)OCFS2_I(inode)->ip_blkno, 1689 ex ? "EXMODE" : "PRMODE"); 1690 1691 status = 0; 1692 acquired = 0; 1693 /* We'll allow faking a readonly metadata lock for 1694 * rodevices. */ 1695 if (ocfs2_is_hard_readonly(osb)) { 1696 if (ex) 1697 status = -EROFS; 1698 goto bail; 1699 } 1700 1701 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) 1702 wait_event(osb->recovery_event, 1703 ocfs2_node_map_is_empty(osb, &osb->recovery_map)); 1704 1705 acquired = 0; 1706 lockres = &OCFS2_I(inode)->ip_meta_lockres; 1707 level = ex ? LKM_EXMODE : LKM_PRMODE; 1708 dlm_flags = 0; 1709 if (arg_flags & OCFS2_META_LOCK_NOQUEUE) 1710 dlm_flags |= LKM_NOQUEUE; 1711 1712 status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); 1713 if (status < 0) { 1714 if (status != -EAGAIN && status != -EIOCBRETRY) 1715 mlog_errno(status); 1716 goto bail; 1717 } 1718 1719 /* Notify the error cleanup path to drop the cluster lock. */ 1720 acquired = 1; 1721 1722 /* We wait twice because a node may have died while we were in 1723 * the lower dlm layers. The second time though, we've 1724 * committed to owning this lock so we don't allow signals to 1725 * abort the operation. */ 1726 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) 1727 wait_event(osb->recovery_event, 1728 ocfs2_node_map_is_empty(osb, &osb->recovery_map)); 1729 1730 /* This is fun. The caller may want a bh back, or it may 1731 * not. ocfs2_meta_lock_update definitely wants one in, but 1732 * may or may not read one, depending on what's in the 1733 * LVB. The result of all of this is that we've *only* gone to 1734 * disk if we have to, so the complexity is worthwhile. */ 1735 status = ocfs2_meta_lock_update(inode, &local_bh); 1736 if (status < 0) { 1737 if (status != -ENOENT) 1738 mlog_errno(status); 1739 goto bail; 1740 } 1741 1742 if (ret_bh) { 1743 status = ocfs2_assign_bh(inode, ret_bh, local_bh); 1744 if (status < 0) { 1745 mlog_errno(status); 1746 goto bail; 1747 } 1748 } 1749 1750 if (handle) { 1751 status = ocfs2_handle_add_lock(handle, inode); 1752 if (status < 0) 1753 mlog_errno(status); 1754 } 1755 1756bail: 1757 if (status < 0) { 1758 if (ret_bh && (*ret_bh)) { 1759 brelse(*ret_bh); 1760 *ret_bh = NULL; 1761 } 1762 if (acquired) 1763 ocfs2_meta_unlock(inode, ex); 1764 } 1765 1766 if (local_bh) 1767 brelse(local_bh); 1768 1769 mlog_exit(status); 1770 return status; 1771} 1772 1773/* 1774 * This is working around a lock inversion between tasks acquiring DLM locks 1775 * while holding a page lock and the vote thread which blocks dlm lock acquiry 1776 * while acquiring page locks. 1777 * 1778 * ** These _with_page variantes are only intended to be called from aop 1779 * methods that hold page locks and return a very specific *positive* error 1780 * code that aop methods pass up to the VFS -- test for errors with != 0. ** 1781 * 1782 * The DLM is called such that it returns -EAGAIN if it would have blocked 1783 * waiting for the vote thread. In that case we unlock our page so the vote 1784 * thread can make progress. Once we've done this we have to return 1785 * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up 1786 * into the VFS who will then immediately retry the aop call. 1787 * 1788 * We do a blocking lock and immediate unlock before returning, though, so that 1789 * the lock has a great chance of being cached on this node by the time the VFS 1790 * calls back to retry the aop. This has a potential to livelock as nodes 1791 * ping locks back and forth, but that's a risk we're willing to take to avoid 1792 * the lock inversion simply. 1793 */ 1794int ocfs2_meta_lock_with_page(struct inode *inode, 1795 struct ocfs2_journal_handle *handle, 1796 struct buffer_head **ret_bh, 1797 int ex, 1798 struct page *page) 1799{ 1800 int ret; 1801 1802 ret = ocfs2_meta_lock_full(inode, handle, ret_bh, ex, 1803 OCFS2_LOCK_NONBLOCK); 1804 if (ret == -EAGAIN) { 1805 unlock_page(page); 1806 if (ocfs2_meta_lock(inode, handle, ret_bh, ex) == 0) 1807 ocfs2_meta_unlock(inode, ex); 1808 ret = AOP_TRUNCATED_PAGE; 1809 } 1810 1811 return ret; 1812} 1813 1814void ocfs2_meta_unlock(struct inode *inode, 1815 int ex) 1816{ 1817 int level = ex ? LKM_EXMODE : LKM_PRMODE; 1818 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; 1819 1820 mlog_entry_void(); 1821 1822 mlog(0, "inode %llu drop %s META lock\n", 1823 (unsigned long long)OCFS2_I(inode)->ip_blkno, 1824 ex ? "EXMODE" : "PRMODE"); 1825 1826 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) 1827 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); 1828 1829 mlog_exit_void(); 1830} 1831 1832int ocfs2_super_lock(struct ocfs2_super *osb, 1833 int ex) 1834{ 1835 int status; 1836 int level = ex ? LKM_EXMODE : LKM_PRMODE; 1837 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; 1838 struct buffer_head *bh; 1839 struct ocfs2_slot_info *si = osb->slot_info; 1840 1841 mlog_entry_void(); 1842 1843 if (ocfs2_is_hard_readonly(osb)) 1844 return -EROFS; 1845 1846 status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); 1847 if (status < 0) { 1848 mlog_errno(status); 1849 goto bail; 1850 } 1851 1852 /* The super block lock path is really in the best position to 1853 * know when resources covered by the lock need to be 1854 * refreshed, so we do it here. Of course, making sense of 1855 * everything is up to the caller :) */ 1856 status = ocfs2_should_refresh_lock_res(lockres); 1857 if (status < 0) { 1858 mlog_errno(status); 1859 goto bail; 1860 } 1861 if (status) { 1862 bh = si->si_bh; 1863 status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, 1864 si->si_inode); 1865 if (status == 0) 1866 ocfs2_update_slot_info(si); 1867 1868 ocfs2_complete_lock_res_refresh(lockres, status); 1869 1870 if (status < 0) 1871 mlog_errno(status); 1872 } 1873bail: 1874 mlog_exit(status); 1875 return status; 1876} 1877 1878void ocfs2_super_unlock(struct ocfs2_super *osb, 1879 int ex) 1880{ 1881 int level = ex ? LKM_EXMODE : LKM_PRMODE; 1882 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; 1883 1884 ocfs2_cluster_unlock(osb, lockres, level); 1885} 1886 1887int ocfs2_rename_lock(struct ocfs2_super *osb) 1888{ 1889 int status; 1890 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; 1891 1892 if (ocfs2_is_hard_readonly(osb)) 1893 return -EROFS; 1894 1895 status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); 1896 if (status < 0) 1897 mlog_errno(status); 1898 1899 return status; 1900} 1901 1902void ocfs2_rename_unlock(struct ocfs2_super *osb) 1903{ 1904 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; 1905 1906 ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); 1907} 1908 1909int ocfs2_dentry_lock(struct dentry *dentry, int ex) 1910{ 1911 int ret; 1912 int level = ex ? LKM_EXMODE : LKM_PRMODE; 1913 struct ocfs2_dentry_lock *dl = dentry->d_fsdata; 1914 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); 1915 1916 BUG_ON(!dl); 1917 1918 if (ocfs2_is_hard_readonly(osb)) 1919 return -EROFS; 1920 1921 ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); 1922 if (ret < 0) 1923 mlog_errno(ret); 1924 1925 return ret; 1926} 1927 1928void ocfs2_dentry_unlock(struct dentry *dentry, int ex) 1929{ 1930 int level = ex ? LKM_EXMODE : LKM_PRMODE; 1931 struct ocfs2_dentry_lock *dl = dentry->d_fsdata; 1932 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); 1933 1934 ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); 1935} 1936 1937/* Reference counting of the dlm debug structure. We want this because 1938 * open references on the debug inodes can live on after a mount, so 1939 * we can't rely on the ocfs2_super to always exist. */ 1940static void ocfs2_dlm_debug_free(struct kref *kref) 1941{ 1942 struct ocfs2_dlm_debug *dlm_debug; 1943 1944 dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); 1945 1946 kfree(dlm_debug); 1947} 1948 1949void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) 1950{ 1951 if (dlm_debug) 1952 kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); 1953} 1954 1955static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) 1956{ 1957 kref_get(&debug->d_refcnt); 1958} 1959 1960struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) 1961{ 1962 struct ocfs2_dlm_debug *dlm_debug; 1963 1964 dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); 1965 if (!dlm_debug) { 1966 mlog_errno(-ENOMEM); 1967 goto out; 1968 } 1969 1970 kref_init(&dlm_debug->d_refcnt); 1971 INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); 1972 dlm_debug->d_locking_state = NULL; 1973out: 1974 return dlm_debug; 1975} 1976 1977/* Access to this is arbitrated for us via seq_file->sem. */ 1978struct ocfs2_dlm_seq_priv { 1979 struct ocfs2_dlm_debug *p_dlm_debug; 1980 struct ocfs2_lock_res p_iter_res; 1981 struct ocfs2_lock_res p_tmp_res; 1982}; 1983 1984static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, 1985 struct ocfs2_dlm_seq_priv *priv) 1986{ 1987 struct ocfs2_lock_res *iter, *ret = NULL; 1988 struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; 1989 1990 assert_spin_locked(&ocfs2_dlm_tracking_lock); 1991 1992 list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { 1993 /* discover the head of the list */ 1994 if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { 1995 mlog(0, "End of list found, %p\n", ret); 1996 break; 1997 } 1998 1999 /* We track our "dummy" iteration lockres' by a NULL 2000 * l_ops field. */ 2001 if (iter->l_ops != NULL) { 2002 ret = iter; 2003 break; 2004 } 2005 } 2006 2007 return ret; 2008} 2009 2010static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) 2011{ 2012 struct ocfs2_dlm_seq_priv *priv = m->private; 2013 struct ocfs2_lock_res *iter; 2014 2015 spin_lock(&ocfs2_dlm_tracking_lock); 2016 iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); 2017 if (iter) { 2018 /* Since lockres' have the lifetime of their container 2019 * (which can be inodes, ocfs2_supers, etc) we want to 2020 * copy this out to a temporary lockres while still 2021 * under the spinlock. Obviously after this we can't 2022 * trust any pointers on the copy returned, but that's 2023 * ok as the information we want isn't typically held 2024 * in them. */ 2025 priv->p_tmp_res = *iter; 2026 iter = &priv->p_tmp_res; 2027 } 2028 spin_unlock(&ocfs2_dlm_tracking_lock); 2029 2030 return iter; 2031} 2032 2033static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) 2034{ 2035} 2036 2037static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) 2038{ 2039 struct ocfs2_dlm_seq_priv *priv = m->private; 2040 struct ocfs2_lock_res *iter = v; 2041 struct ocfs2_lock_res *dummy = &priv->p_iter_res; 2042 2043 spin_lock(&ocfs2_dlm_tracking_lock); 2044 iter = ocfs2_dlm_next_res(iter, priv); 2045 list_del_init(&dummy->l_debug_list); 2046 if (iter) { 2047 list_add(&dummy->l_debug_list, &iter->l_debug_list); 2048 priv->p_tmp_res = *iter; 2049 iter = &priv->p_tmp_res; 2050 } 2051 spin_unlock(&ocfs2_dlm_tracking_lock); 2052 2053 return iter; 2054} 2055 2056/* So that debugfs.ocfs2 can determine which format is being used */ 2057#define OCFS2_DLM_DEBUG_STR_VERSION 1 2058static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) 2059{ 2060 int i; 2061 char *lvb; 2062 struct ocfs2_lock_res *lockres = v; 2063 2064 if (!lockres) 2065 return -EINVAL; 2066 2067 seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); 2068 2069 if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) 2070 seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, 2071 lockres->l_name, 2072 (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); 2073 else 2074 seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); 2075 2076 seq_printf(m, "%d\t" 2077 "0x%lx\t" 2078 "0x%x\t" 2079 "0x%x\t" 2080 "%u\t" 2081 "%u\t" 2082 "%d\t" 2083 "%d\t", 2084 lockres->l_level, 2085 lockres->l_flags, 2086 lockres->l_action, 2087 lockres->l_unlock_action, 2088 lockres->l_ro_holders, 2089 lockres->l_ex_holders, 2090 lockres->l_requested, 2091 lockres->l_blocking); 2092 2093 /* Dump the raw LVB */ 2094 lvb = lockres->l_lksb.lvb; 2095 for(i = 0; i < DLM_LVB_LEN; i++) 2096 seq_printf(m, "0x%x\t", lvb[i]); 2097 2098 /* End the line */ 2099 seq_printf(m, "\n"); 2100 return 0; 2101} 2102 2103static struct seq_operations ocfs2_dlm_seq_ops = { 2104 .start = ocfs2_dlm_seq_start, 2105 .stop = ocfs2_dlm_seq_stop, 2106 .next = ocfs2_dlm_seq_next, 2107 .show = ocfs2_dlm_seq_show, 2108}; 2109 2110static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) 2111{ 2112 struct seq_file *seq = (struct seq_file *) file->private_data; 2113 struct ocfs2_dlm_seq_priv *priv = seq->private; 2114 struct ocfs2_lock_res *res = &priv->p_iter_res; 2115 2116 ocfs2_remove_lockres_tracking(res); 2117 ocfs2_put_dlm_debug(priv->p_dlm_debug); 2118 return seq_release_private(inode, file); 2119} 2120 2121static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) 2122{ 2123 int ret; 2124 struct ocfs2_dlm_seq_priv *priv; 2125 struct seq_file *seq; 2126 struct ocfs2_super *osb; 2127 2128 priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); 2129 if (!priv) { 2130 ret = -ENOMEM; 2131 mlog_errno(ret); 2132 goto out; 2133 } 2134 osb = (struct ocfs2_super *) inode->u.generic_ip; 2135 ocfs2_get_dlm_debug(osb->osb_dlm_debug); 2136 priv->p_dlm_debug = osb->osb_dlm_debug; 2137 INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); 2138 2139 ret = seq_open(file, &ocfs2_dlm_seq_ops); 2140 if (ret) { 2141 kfree(priv); 2142 mlog_errno(ret); 2143 goto out; 2144 } 2145 2146 seq = (struct seq_file *) file->private_data; 2147 seq->private = priv; 2148 2149 ocfs2_add_lockres_tracking(&priv->p_iter_res, 2150 priv->p_dlm_debug); 2151 2152out: 2153 return ret; 2154} 2155 2156static const struct file_operations ocfs2_dlm_debug_fops = { 2157 .open = ocfs2_dlm_debug_open, 2158 .release = ocfs2_dlm_debug_release, 2159 .read = seq_read, 2160 .llseek = seq_lseek, 2161}; 2162 2163static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) 2164{ 2165 int ret = 0; 2166 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; 2167 2168 dlm_debug->d_locking_state = debugfs_create_file("locking_state", 2169 S_IFREG|S_IRUSR, 2170 osb->osb_debug_root, 2171 osb, 2172 &ocfs2_dlm_debug_fops); 2173 if (!dlm_debug->d_locking_state) { 2174 ret = -EINVAL; 2175 mlog(ML_ERROR, 2176 "Unable to create locking state debugfs file.\n"); 2177 goto out; 2178 } 2179 2180 ocfs2_get_dlm_debug(dlm_debug); 2181out: 2182 return ret; 2183} 2184 2185static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) 2186{ 2187 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; 2188 2189 if (dlm_debug) { 2190 debugfs_remove(dlm_debug->d_locking_state); 2191 ocfs2_put_dlm_debug(dlm_debug); 2192 } 2193} 2194 2195int ocfs2_dlm_init(struct ocfs2_super *osb) 2196{ 2197 int status; 2198 u32 dlm_key; 2199 struct dlm_ctxt *dlm; 2200 2201 mlog_entry_void(); 2202 2203 status = ocfs2_dlm_init_debug(osb); 2204 if (status < 0) { 2205 mlog_errno(status); 2206 goto bail; 2207 } 2208 2209 /* launch vote thread */ 2210 osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote"); 2211 if (IS_ERR(osb->vote_task)) { 2212 status = PTR_ERR(osb->vote_task); 2213 osb->vote_task = NULL; 2214 mlog_errno(status); 2215 goto bail; 2216 } 2217 2218 /* used by the dlm code to make message headers unique, each 2219 * node in this domain must agree on this. */ 2220 dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); 2221 2222 /* for now, uuid == domain */ 2223 dlm = dlm_register_domain(osb->uuid_str, dlm_key); 2224 if (IS_ERR(dlm)) { 2225 status = PTR_ERR(dlm); 2226 mlog_errno(status); 2227 goto bail; 2228 } 2229 2230 ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); 2231 ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); 2232 2233 dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); 2234 2235 osb->dlm = dlm; 2236 2237 status = 0; 2238bail: 2239 if (status < 0) { 2240 ocfs2_dlm_shutdown_debug(osb); 2241 if (osb->vote_task) 2242 kthread_stop(osb->vote_task); 2243 } 2244 2245 mlog_exit(status); 2246 return status; 2247} 2248 2249void ocfs2_dlm_shutdown(struct ocfs2_super *osb) 2250{ 2251 mlog_entry_void(); 2252 2253 dlm_unregister_eviction_cb(&osb->osb_eviction_cb); 2254 2255 ocfs2_drop_osb_locks(osb); 2256 2257 if (osb->vote_task) { 2258 kthread_stop(osb->vote_task); 2259 osb->vote_task = NULL; 2260 } 2261 2262 ocfs2_lock_res_free(&osb->osb_super_lockres); 2263 ocfs2_lock_res_free(&osb->osb_rename_lockres); 2264 2265 dlm_unregister_domain(osb->dlm); 2266 osb->dlm = NULL; 2267 2268 ocfs2_dlm_shutdown_debug(osb); 2269 2270 mlog_exit_void(); 2271} 2272 2273static void ocfs2_unlock_ast_func(void *opaque, enum dlm_status status) 2274{ 2275 struct ocfs2_lock_res *lockres = opaque; 2276 unsigned long flags; 2277 2278 mlog_entry_void(); 2279 2280 mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, 2281 lockres->l_unlock_action); 2282 2283 spin_lock_irqsave(&lockres->l_lock, flags); 2284 /* We tried to cancel a convert request, but it was already 2285 * granted. All we want to do here is clear our unlock 2286 * state. The wake_up call done at the bottom is redundant 2287 * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't 2288 * hurt anything anyway */ 2289 if (status == DLM_CANCELGRANT && 2290 lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { 2291 mlog(0, "Got cancelgrant for %s\n", lockres->l_name); 2292 2293 /* We don't clear the busy flag in this case as it 2294 * should have been cleared by the ast which the dlm 2295 * has called. */ 2296 goto complete_unlock; 2297 } 2298 2299 if (status != DLM_NORMAL) { 2300 mlog(ML_ERROR, "Dlm passes status %d for lock %s, " 2301 "unlock_action %d\n", status, lockres->l_name, 2302 lockres->l_unlock_action); 2303 spin_unlock_irqrestore(&lockres->l_lock, flags); 2304 return; 2305 } 2306 2307 switch(lockres->l_unlock_action) { 2308 case OCFS2_UNLOCK_CANCEL_CONVERT: 2309 mlog(0, "Cancel convert success for %s\n", lockres->l_name); 2310 lockres->l_action = OCFS2_AST_INVALID; 2311 break; 2312 case OCFS2_UNLOCK_DROP_LOCK: 2313 lockres->l_level = LKM_IVMODE; 2314 break; 2315 default: 2316 BUG(); 2317 } 2318 2319 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 2320complete_unlock: 2321 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; 2322 spin_unlock_irqrestore(&lockres->l_lock, flags); 2323 2324 wake_up(&lockres->l_event); 2325 2326 mlog_exit_void(); 2327} 2328 2329typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *); 2330 2331struct drop_lock_cb { 2332 ocfs2_pre_drop_cb_t *drop_func; 2333 void *drop_data; 2334}; 2335 2336static int ocfs2_drop_lock(struct ocfs2_super *osb, 2337 struct ocfs2_lock_res *lockres, 2338 struct drop_lock_cb *dcb) 2339{ 2340 enum dlm_status status; 2341 unsigned long flags; 2342 2343 /* We didn't get anywhere near actually using this lockres. */ 2344 if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) 2345 goto out; 2346 2347 spin_lock_irqsave(&lockres->l_lock, flags); 2348 2349 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), 2350 "lockres %s, flags 0x%lx\n", 2351 lockres->l_name, lockres->l_flags); 2352 2353 while (lockres->l_flags & OCFS2_LOCK_BUSY) { 2354 mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " 2355 "%u, unlock_action = %u\n", 2356 lockres->l_name, lockres->l_flags, lockres->l_action, 2357 lockres->l_unlock_action); 2358 2359 spin_unlock_irqrestore(&lockres->l_lock, flags); 2360 2361 /* XXX: Today we just wait on any busy 2362 * locks... Perhaps we need to cancel converts in the 2363 * future? */ 2364 ocfs2_wait_on_busy_lock(lockres); 2365 2366 spin_lock_irqsave(&lockres->l_lock, flags); 2367 } 2368 2369 if (dcb) 2370 dcb->drop_func(lockres, dcb->drop_data); 2371 2372 if (lockres->l_flags & OCFS2_LOCK_BUSY) 2373 mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", 2374 lockres->l_name); 2375 if (lockres->l_flags & OCFS2_LOCK_BLOCKED) 2376 mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); 2377 2378 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { 2379 spin_unlock_irqrestore(&lockres->l_lock, flags); 2380 goto out; 2381 } 2382 2383 lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); 2384 2385 /* make sure we never get here while waiting for an ast to 2386 * fire. */ 2387 BUG_ON(lockres->l_action != OCFS2_AST_INVALID); 2388 2389 /* is this necessary? */ 2390 lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 2391 lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; 2392 spin_unlock_irqrestore(&lockres->l_lock, flags); 2393 2394 mlog(0, "lock %s\n", lockres->l_name); 2395 2396 status = dlmunlock(osb->dlm, &lockres->l_lksb, LKM_VALBLK, 2397 lockres->l_ops->unlock_ast, lockres); 2398 if (status != DLM_NORMAL) { 2399 ocfs2_log_dlm_error("dlmunlock", status, lockres); 2400 mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); 2401 dlm_print_one_lock(lockres->l_lksb.lockid); 2402 BUG(); 2403 } 2404 mlog(0, "lock %s, successfull return from dlmunlock\n", 2405 lockres->l_name); 2406 2407 ocfs2_wait_on_busy_lock(lockres); 2408out: 2409 mlog_exit(0); 2410 return 0; 2411} 2412 2413/* Mark the lockres as being dropped. It will no longer be 2414 * queued if blocking, but we still may have to wait on it 2415 * being dequeued from the vote thread before we can consider 2416 * it safe to drop. 2417 * 2418 * You can *not* attempt to call cluster_lock on this lockres anymore. */ 2419void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) 2420{ 2421 int status; 2422 struct ocfs2_mask_waiter mw; 2423 unsigned long flags; 2424 2425 ocfs2_init_mask_waiter(&mw); 2426 2427 spin_lock_irqsave(&lockres->l_lock, flags); 2428 lockres->l_flags |= OCFS2_LOCK_FREEING; 2429 while (lockres->l_flags & OCFS2_LOCK_QUEUED) { 2430 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); 2431 spin_unlock_irqrestore(&lockres->l_lock, flags); 2432 2433 mlog(0, "Waiting on lockres %s\n", lockres->l_name); 2434 2435 status = ocfs2_wait_for_mask(&mw); 2436 if (status) 2437 mlog_errno(status); 2438 2439 spin_lock_irqsave(&lockres->l_lock, flags); 2440 } 2441 spin_unlock_irqrestore(&lockres->l_lock, flags); 2442} 2443 2444void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, 2445 struct ocfs2_lock_res *lockres) 2446{ 2447 int ret; 2448 2449 ocfs2_mark_lockres_freeing(lockres); 2450 ret = ocfs2_drop_lock(osb, lockres, NULL); 2451 if (ret) 2452 mlog_errno(ret); 2453} 2454 2455static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) 2456{ 2457 ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); 2458 ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); 2459} 2460 2461static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data) 2462{ 2463 struct inode *inode = data; 2464 2465 /* the metadata lock requires a bit more work as we have an 2466 * LVB to worry about. */ 2467 if (lockres->l_flags & OCFS2_LOCK_ATTACHED && 2468 lockres->l_level == LKM_EXMODE && 2469 !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) 2470 __ocfs2_stuff_meta_lvb(inode); 2471} 2472 2473int ocfs2_drop_inode_locks(struct inode *inode) 2474{ 2475 int status, err; 2476 struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, }; 2477 2478 mlog_entry_void(); 2479 2480 /* No need to call ocfs2_mark_lockres_freeing here - 2481 * ocfs2_clear_inode has done it for us. */ 2482 2483 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 2484 &OCFS2_I(inode)->ip_data_lockres, 2485 NULL); 2486 if (err < 0) 2487 mlog_errno(err); 2488 2489 status = err; 2490 2491 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 2492 &OCFS2_I(inode)->ip_meta_lockres, 2493 &meta_dcb); 2494 if (err < 0) 2495 mlog_errno(err); 2496 if (err < 0 && !status) 2497 status = err; 2498 2499 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 2500 &OCFS2_I(inode)->ip_rw_lockres, 2501 NULL); 2502 if (err < 0) 2503 mlog_errno(err); 2504 if (err < 0 && !status) 2505 status = err; 2506 2507 mlog_exit(status); 2508 return status; 2509} 2510 2511static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, 2512 int new_level) 2513{ 2514 assert_spin_locked(&lockres->l_lock); 2515 2516 BUG_ON(lockres->l_blocking <= LKM_NLMODE); 2517 2518 if (lockres->l_level <= new_level) { 2519 mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", 2520 lockres->l_level, new_level); 2521 BUG(); 2522 } 2523 2524 mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", 2525 lockres->l_name, new_level, lockres->l_blocking); 2526 2527 lockres->l_action = OCFS2_AST_DOWNCONVERT; 2528 lockres->l_requested = new_level; 2529 lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 2530} 2531 2532static int ocfs2_downconvert_lock(struct ocfs2_super *osb, 2533 struct ocfs2_lock_res *lockres, 2534 int new_level, 2535 int lvb) 2536{ 2537 int ret, dlm_flags = LKM_CONVERT; 2538 enum dlm_status status; 2539 2540 mlog_entry_void(); 2541 2542 if (lvb) 2543 dlm_flags |= LKM_VALBLK; 2544 2545 status = dlmlock(osb->dlm, 2546 new_level, 2547 &lockres->l_lksb, 2548 dlm_flags, 2549 lockres->l_name, 2550 OCFS2_LOCK_ID_MAX_LEN - 1, 2551 lockres->l_ops->ast, 2552 lockres, 2553 lockres->l_ops->bast); 2554 if (status != DLM_NORMAL) { 2555 ocfs2_log_dlm_error("dlmlock", status, lockres); 2556 ret = -EINVAL; 2557 ocfs2_recover_from_dlm_error(lockres, 1); 2558 goto bail; 2559 } 2560 2561 ret = 0; 2562bail: 2563 mlog_exit(ret); 2564 return ret; 2565} 2566 2567/* returns 1 when the caller should unlock and call dlmunlock */ 2568static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, 2569 struct ocfs2_lock_res *lockres) 2570{ 2571 assert_spin_locked(&lockres->l_lock); 2572 2573 mlog_entry_void(); 2574 mlog(0, "lock %s\n", lockres->l_name); 2575 2576 if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { 2577 /* If we're already trying to cancel a lock conversion 2578 * then just drop the spinlock and allow the caller to 2579 * requeue this lock. */ 2580 2581 mlog(0, "Lockres %s, skip convert\n", lockres->l_name); 2582 return 0; 2583 } 2584 2585 /* were we in a convert when we got the bast fire? */ 2586 BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && 2587 lockres->l_action != OCFS2_AST_DOWNCONVERT); 2588 /* set things up for the unlockast to know to just 2589 * clear out the ast_action and unset busy, etc. */ 2590 lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; 2591 2592 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), 2593 "lock %s, invalid flags: 0x%lx\n", 2594 lockres->l_name, lockres->l_flags); 2595 2596 return 1; 2597} 2598 2599static int ocfs2_cancel_convert(struct ocfs2_super *osb, 2600 struct ocfs2_lock_res *lockres) 2601{ 2602 int ret; 2603 enum dlm_status status; 2604 2605 mlog_entry_void(); 2606 mlog(0, "lock %s\n", lockres->l_name); 2607 2608 ret = 0; 2609 status = dlmunlock(osb->dlm, 2610 &lockres->l_lksb, 2611 LKM_CANCEL, 2612 lockres->l_ops->unlock_ast, 2613 lockres); 2614 if (status != DLM_NORMAL) { 2615 ocfs2_log_dlm_error("dlmunlock", status, lockres); 2616 ret = -EINVAL; 2617 ocfs2_recover_from_dlm_error(lockres, 0); 2618 } 2619 2620 mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); 2621 2622 mlog_exit(ret); 2623 return ret; 2624} 2625 2626static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, 2627 struct ocfs2_lock_res *lockres, 2628 int new_level) 2629{ 2630 int ret; 2631 2632 mlog_entry_void(); 2633 2634 BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); 2635 2636 if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { 2637 ret = 0; 2638 mlog(0, "lockres %s currently being refreshed -- backing " 2639 "off!\n", lockres->l_name); 2640 } else if (new_level == LKM_PRMODE) 2641 ret = !lockres->l_ex_holders && 2642 ocfs2_inode_fully_checkpointed(inode); 2643 else /* Must be NLMODE we're converting to. */ 2644 ret = !lockres->l_ro_holders && !lockres->l_ex_holders && 2645 ocfs2_inode_fully_checkpointed(inode); 2646 2647 mlog_exit(ret); 2648 return ret; 2649} 2650 2651static int ocfs2_do_unblock_meta(struct inode *inode, 2652 int *requeue) 2653{ 2654 int new_level; 2655 int set_lvb = 0; 2656 int ret = 0; 2657 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; 2658 unsigned long flags; 2659 2660 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 2661 2662 mlog_entry_void(); 2663 2664 spin_lock_irqsave(&lockres->l_lock, flags); 2665 2666 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); 2667 2668 mlog(0, "l_level=%d, l_blocking=%d\n", lockres->l_level, 2669 lockres->l_blocking); 2670 2671 BUG_ON(lockres->l_level != LKM_EXMODE && 2672 lockres->l_level != LKM_PRMODE); 2673 2674 if (lockres->l_flags & OCFS2_LOCK_BUSY) { 2675 *requeue = 1; 2676 ret = ocfs2_prepare_cancel_convert(osb, lockres); 2677 spin_unlock_irqrestore(&lockres->l_lock, flags); 2678 if (ret) { 2679 ret = ocfs2_cancel_convert(osb, lockres); 2680 if (ret < 0) 2681 mlog_errno(ret); 2682 } 2683 goto leave; 2684 } 2685 2686 new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); 2687 2688 mlog(0, "l_level=%d, l_blocking=%d, new_level=%d\n", 2689 lockres->l_level, lockres->l_blocking, new_level); 2690 2691 if (ocfs2_can_downconvert_meta_lock(inode, lockres, new_level)) { 2692 if (lockres->l_level == LKM_EXMODE) 2693 set_lvb = 1; 2694 2695 /* If the lock hasn't been refreshed yet (rare), then 2696 * our memory inode values are old and we skip 2697 * stuffing the lvb. There's no need to actually clear 2698 * out the lvb here as it's value is still valid. */ 2699 if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { 2700 if (set_lvb) 2701 __ocfs2_stuff_meta_lvb(inode); 2702 } else 2703 mlog(0, "lockres %s: downconverting stale lock!\n", 2704 lockres->l_name); 2705 2706 mlog(0, "calling ocfs2_downconvert_lock with l_level=%d, " 2707 "l_blocking=%d, new_level=%d\n", 2708 lockres->l_level, lockres->l_blocking, new_level); 2709 2710 ocfs2_prepare_downconvert(lockres, new_level); 2711 spin_unlock_irqrestore(&lockres->l_lock, flags); 2712 ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); 2713 goto leave; 2714 } 2715 if (!ocfs2_inode_fully_checkpointed(inode)) 2716 ocfs2_start_checkpoint(osb); 2717 2718 *requeue = 1; 2719 spin_unlock_irqrestore(&lockres->l_lock, flags); 2720 ret = 0; 2721leave: 2722 mlog_exit(ret); 2723 return ret; 2724} 2725 2726static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, 2727 struct ocfs2_lock_res *lockres, 2728 struct ocfs2_unblock_ctl *ctl, 2729 ocfs2_convert_worker_t *worker) 2730{ 2731 unsigned long flags; 2732 int blocking; 2733 int new_level; 2734 int ret = 0; 2735 2736 mlog_entry_void(); 2737 2738 spin_lock_irqsave(&lockres->l_lock, flags); 2739 2740 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); 2741 2742recheck: 2743 if (lockres->l_flags & OCFS2_LOCK_BUSY) { 2744 ctl->requeue = 1; 2745 ret = ocfs2_prepare_cancel_convert(osb, lockres); 2746 spin_unlock_irqrestore(&lockres->l_lock, flags); 2747 if (ret) { 2748 ret = ocfs2_cancel_convert(osb, lockres); 2749 if (ret < 0) 2750 mlog_errno(ret); 2751 } 2752 goto leave; 2753 } 2754 2755 /* if we're blocking an exclusive and we have *any* holders, 2756 * then requeue. */ 2757 if ((lockres->l_blocking == LKM_EXMODE) 2758 && (lockres->l_ex_holders || lockres->l_ro_holders)) { 2759 spin_unlock_irqrestore(&lockres->l_lock, flags); 2760 ctl->requeue = 1; 2761 ret = 0; 2762 goto leave; 2763 } 2764 2765 /* If it's a PR we're blocking, then only 2766 * requeue if we've got any EX holders */ 2767 if (lockres->l_blocking == LKM_PRMODE && 2768 lockres->l_ex_holders) { 2769 spin_unlock_irqrestore(&lockres->l_lock, flags); 2770 ctl->requeue = 1; 2771 ret = 0; 2772 goto leave; 2773 } 2774 2775 /* If we get here, then we know that there are no more 2776 * incompatible holders (and anyone asking for an incompatible 2777 * lock is blocked). We can now downconvert the lock */ 2778 if (!worker) 2779 goto downconvert; 2780 2781 /* Some lockres types want to do a bit of work before 2782 * downconverting a lock. Allow that here. The worker function 2783 * may sleep, so we save off a copy of what we're blocking as 2784 * it may change while we're not holding the spin lock. */ 2785 blocking = lockres->l_blocking; 2786 spin_unlock_irqrestore(&lockres->l_lock, flags); 2787 2788 ctl->unblock_action = worker(lockres, blocking); 2789 2790 if (ctl->unblock_action == UNBLOCK_STOP_POST) 2791 goto leave; 2792 2793 spin_lock_irqsave(&lockres->l_lock, flags); 2794 if (blocking != lockres->l_blocking) { 2795 /* If this changed underneath us, then we can't drop 2796 * it just yet. */ 2797 goto recheck; 2798 } 2799 2800downconvert: 2801 ctl->requeue = 0; 2802 new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); 2803 2804 ocfs2_prepare_downconvert(lockres, new_level); 2805 spin_unlock_irqrestore(&lockres->l_lock, flags); 2806 ret = ocfs2_downconvert_lock(osb, lockres, new_level, 0); 2807leave: 2808 mlog_exit(ret); 2809 return ret; 2810} 2811 2812static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, 2813 int blocking) 2814{ 2815 struct inode *inode; 2816 struct address_space *mapping; 2817 2818 inode = ocfs2_lock_res_inode(lockres); 2819 mapping = inode->i_mapping; 2820 2821 if (filemap_fdatawrite(mapping)) { 2822 mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", 2823 (unsigned long long)OCFS2_I(inode)->ip_blkno); 2824 } 2825 sync_mapping_buffers(mapping); 2826 if (blocking == LKM_EXMODE) { 2827 truncate_inode_pages(mapping, 0); 2828 unmap_mapping_range(mapping, 0, 0, 0); 2829 } else { 2830 /* We only need to wait on the I/O if we're not also 2831 * truncating pages because truncate_inode_pages waits 2832 * for us above. We don't truncate pages if we're 2833 * blocking anything < EXMODE because we want to keep 2834 * them around in that case. */ 2835 filemap_fdatawait(mapping); 2836 } 2837 2838 return UNBLOCK_CONTINUE; 2839} 2840 2841int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, 2842 struct ocfs2_unblock_ctl *ctl) 2843{ 2844 int status; 2845 struct inode *inode; 2846 struct ocfs2_super *osb; 2847 2848 mlog_entry_void(); 2849 2850 inode = ocfs2_lock_res_inode(lockres); 2851 osb = OCFS2_SB(inode->i_sb); 2852 2853 mlog(0, "unblock inode %llu\n", 2854 (unsigned long long)OCFS2_I(inode)->ip_blkno); 2855 2856 status = ocfs2_generic_unblock_lock(osb, lockres, ctl, 2857 ocfs2_data_convert_worker); 2858 if (status < 0) 2859 mlog_errno(status); 2860 2861 mlog(0, "inode %llu, requeue = %d\n", 2862 (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue); 2863 2864 mlog_exit(status); 2865 return status; 2866} 2867 2868static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, 2869 struct ocfs2_unblock_ctl *ctl) 2870{ 2871 int status; 2872 struct inode *inode; 2873 2874 mlog_entry_void(); 2875 2876 mlog(0, "Unblock lockres %s\n", lockres->l_name); 2877 2878 inode = ocfs2_lock_res_inode(lockres); 2879 2880 status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb), 2881 lockres, ctl, NULL); 2882 if (status < 0) 2883 mlog_errno(status); 2884 2885 mlog_exit(status); 2886 return status; 2887} 2888 2889static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, 2890 struct ocfs2_unblock_ctl *ctl) 2891{ 2892 int status; 2893 struct inode *inode; 2894 2895 mlog_entry_void(); 2896 2897 inode = ocfs2_lock_res_inode(lockres); 2898 2899 mlog(0, "unblock inode %llu\n", 2900 (unsigned long long)OCFS2_I(inode)->ip_blkno); 2901 2902 status = ocfs2_do_unblock_meta(inode, &ctl->requeue); 2903 if (status < 0) 2904 mlog_errno(status); 2905 2906 mlog(0, "inode %llu, requeue = %d\n", 2907 (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue); 2908 2909 mlog_exit(status); 2910 return status; 2911} 2912 2913/* 2914 * Does the final reference drop on our dentry lock. Right now this 2915 * happens in the vote thread, but we could choose to simplify the 2916 * dlmglue API and push these off to the ocfs2_wq in the future. 2917 */ 2918static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, 2919 struct ocfs2_lock_res *lockres) 2920{ 2921 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); 2922 ocfs2_dentry_lock_put(osb, dl); 2923} 2924 2925/* 2926 * d_delete() matching dentries before the lock downconvert. 2927 * 2928 * At this point, any process waiting to destroy the 2929 * dentry_lock due to last ref count is stopped by the 2930 * OCFS2_LOCK_QUEUED flag. 2931 * 2932 * We have two potential problems 2933 * 2934 * 1) If we do the last reference drop on our dentry_lock (via dput) 2935 * we'll wind up in ocfs2_release_dentry_lock(), waiting on 2936 * the downconvert to finish. Instead we take an elevated 2937 * reference and push the drop until after we've completed our 2938 * unblock processing. 2939 * 2940 * 2) There might be another process with a final reference, 2941 * waiting on us to finish processing. If this is the case, we 2942 * detect it and exit out - there's no more dentries anyway. 2943 */ 2944static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, 2945 int blocking) 2946{ 2947 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); 2948 struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); 2949 struct dentry *dentry; 2950 unsigned long flags; 2951 int extra_ref = 0; 2952 2953 /* 2954 * This node is blocking another node from getting a read 2955 * lock. This happens when we've renamed within a 2956 * directory. We've forced the other nodes to d_delete(), but 2957 * we never actually dropped our lock because it's still 2958 * valid. The downconvert code will retain a PR for this node, 2959 * so there's no further work to do. 2960 */ 2961 if (blocking == LKM_PRMODE) 2962 return UNBLOCK_CONTINUE; 2963 2964 /* 2965 * Mark this inode as potentially orphaned. The code in 2966 * ocfs2_delete_inode() will figure out whether it actually 2967 * needs to be freed or not. 2968 */ 2969 spin_lock(&oi->ip_lock); 2970 oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; 2971 spin_unlock(&oi->ip_lock); 2972 2973 /* 2974 * Yuck. We need to make sure however that the check of 2975 * OCFS2_LOCK_FREEING and the extra reference are atomic with 2976 * respect to a reference decrement or the setting of that 2977 * flag. 2978 */ 2979 spin_lock_irqsave(&lockres->l_lock, flags); 2980 spin_lock(&dentry_attach_lock); 2981 if (!(lockres->l_flags & OCFS2_LOCK_FREEING) 2982 && dl->dl_count) { 2983 dl->dl_count++; 2984 extra_ref = 1; 2985 } 2986 spin_unlock(&dentry_attach_lock); 2987 spin_unlock_irqrestore(&lockres->l_lock, flags); 2988 2989 mlog(0, "extra_ref = %d\n", extra_ref); 2990 2991 /* 2992 * We have a process waiting on us in ocfs2_dentry_iput(), 2993 * which means we can't have any more outstanding 2994 * aliases. There's no need to do any more work. 2995 */ 2996 if (!extra_ref) 2997 return UNBLOCK_CONTINUE; 2998 2999 spin_lock(&dentry_attach_lock); 3000 while (1) { 3001 dentry = ocfs2_find_local_alias(dl->dl_inode, 3002 dl->dl_parent_blkno, 1); 3003 if (!dentry) 3004 break; 3005 spin_unlock(&dentry_attach_lock); 3006 3007 mlog(0, "d_delete(%.*s);\n", dentry->d_name.len, 3008 dentry->d_name.name); 3009 3010 /* 3011 * The following dcache calls may do an 3012 * iput(). Normally we don't want that from the 3013 * downconverting thread, but in this case it's ok 3014 * because the requesting node already has an 3015 * exclusive lock on the inode, so it can't be queued 3016 * for a downconvert. 3017 */ 3018 d_delete(dentry); 3019 dput(dentry); 3020 3021 spin_lock(&dentry_attach_lock); 3022 } 3023 spin_unlock(&dentry_attach_lock); 3024 3025 /* 3026 * If we are the last holder of this dentry lock, there is no 3027 * reason to downconvert so skip straight to the unlock. 3028 */ 3029 if (dl->dl_count == 1) 3030 return UNBLOCK_STOP_POST; 3031 3032 return UNBLOCK_CONTINUE_POST; 3033} 3034 3035static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres, 3036 struct ocfs2_unblock_ctl *ctl) 3037{ 3038 int ret; 3039 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); 3040 struct ocfs2_super *osb = OCFS2_SB(dl->dl_inode->i_sb); 3041 3042 mlog(0, "unblock dentry lock: %llu\n", 3043 (unsigned long long)OCFS2_I(dl->dl_inode)->ip_blkno); 3044 3045 ret = ocfs2_generic_unblock_lock(osb, 3046 lockres, 3047 ctl, 3048 ocfs2_dentry_convert_worker); 3049 if (ret < 0) 3050 mlog_errno(ret); 3051 3052 mlog(0, "requeue = %d, post = %d\n", ctl->requeue, ctl->unblock_action); 3053 3054 return ret; 3055} 3056 3057/* Generic unblock function for any lockres whose private data is an 3058 * ocfs2_super pointer. */ 3059static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, 3060 struct ocfs2_unblock_ctl *ctl) 3061{ 3062 int status; 3063 struct ocfs2_super *osb; 3064 3065 mlog_entry_void(); 3066 3067 mlog(0, "Unblock lockres %s\n", lockres->l_name); 3068 3069 osb = ocfs2_lock_res_super(lockres); 3070 3071 status = ocfs2_generic_unblock_lock(osb, 3072 lockres, 3073 ctl, 3074 NULL); 3075 if (status < 0) 3076 mlog_errno(status); 3077 3078 mlog_exit(status); 3079 return status; 3080} 3081 3082void ocfs2_process_blocked_lock(struct ocfs2_super *osb, 3083 struct ocfs2_lock_res *lockres) 3084{ 3085 int status; 3086 struct ocfs2_unblock_ctl ctl = {0, 0,}; 3087 unsigned long flags; 3088 3089 /* Our reference to the lockres in this function can be 3090 * considered valid until we remove the OCFS2_LOCK_QUEUED 3091 * flag. */ 3092 3093 mlog_entry_void(); 3094 3095 BUG_ON(!lockres); 3096 BUG_ON(!lockres->l_ops); 3097 BUG_ON(!lockres->l_ops->unblock); 3098 3099 mlog(0, "lockres %s blocked.\n", lockres->l_name); 3100 3101 /* Detect whether a lock has been marked as going away while 3102 * the vote thread was processing other things. A lock can 3103 * still be marked with OCFS2_LOCK_FREEING after this check, 3104 * but short circuiting here will still save us some 3105 * performance. */ 3106 spin_lock_irqsave(&lockres->l_lock, flags); 3107 if (lockres->l_flags & OCFS2_LOCK_FREEING) 3108 goto unqueue; 3109 spin_unlock_irqrestore(&lockres->l_lock, flags); 3110 3111 status = lockres->l_ops->unblock(lockres, &ctl); 3112 if (status < 0) 3113 mlog_errno(status); 3114 3115 spin_lock_irqsave(&lockres->l_lock, flags); 3116unqueue: 3117 if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { 3118 lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); 3119 } else 3120 ocfs2_schedule_blocked_lock(osb, lockres); 3121 3122 mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, 3123 ctl.requeue ? "yes" : "no"); 3124 spin_unlock_irqrestore(&lockres->l_lock, flags); 3125 3126 if (ctl.unblock_action != UNBLOCK_CONTINUE 3127 && lockres->l_ops->post_unlock) 3128 lockres->l_ops->post_unlock(osb, lockres); 3129 3130 mlog_exit_void(); 3131} 3132 3133static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, 3134 struct ocfs2_lock_res *lockres) 3135{ 3136 mlog_entry_void(); 3137 3138 assert_spin_locked(&lockres->l_lock); 3139 3140 if (lockres->l_flags & OCFS2_LOCK_FREEING) { 3141 /* Do not schedule a lock for downconvert when it's on 3142 * the way to destruction - any nodes wanting access 3143 * to the resource will get it soon. */ 3144 mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", 3145 lockres->l_name, lockres->l_flags); 3146 return; 3147 } 3148 3149 lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); 3150 3151 spin_lock(&osb->vote_task_lock); 3152 if (list_empty(&lockres->l_blocked_list)) { 3153 list_add_tail(&lockres->l_blocked_list, 3154 &osb->blocked_lock_list); 3155 osb->blocked_lock_count++; 3156 } 3157 spin_unlock(&osb->vote_task_lock); 3158 3159 mlog_exit_void(); 3160} 3161 3162/* This aids in debugging situations where a bad LVB might be involved. */ 3163void ocfs2_dump_meta_lvb_info(u64 level, 3164 const char *function, 3165 unsigned int line, 3166 struct ocfs2_lock_res *lockres) 3167{ 3168 struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 3169 3170 mlog(level, "LVB information for %s (called from %s:%u):\n", 3171 lockres->l_name, function, line); 3172 mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", 3173 lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), 3174 be32_to_cpu(lvb->lvb_igeneration)); 3175 mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", 3176 (unsigned long long)be64_to_cpu(lvb->lvb_isize), 3177 be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), 3178 be16_to_cpu(lvb->lvb_imode)); 3179 mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " 3180 "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), 3181 (long long)be64_to_cpu(lvb->lvb_iatime_packed), 3182 (long long)be64_to_cpu(lvb->lvb_ictime_packed), 3183 (long long)be64_to_cpu(lvb->lvb_imtime_packed), 3184 be32_to_cpu(lvb->lvb_iattr)); 3185} 3186