1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * ocfs2.h 5 * 6 * Defines macros and structures used in OCFS2 7 * 8 * Copyright (C) 2002, 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 #ifndef OCFS2_H 27 #define OCFS2_H 28 29 #include <linux/spinlock.h> 30 #include <linux/sched.h> 31 #include <linux/wait.h> 32 #include <linux/list.h> 33 #include <linux/rbtree.h> 34 #include <linux/workqueue.h> 35 #include <linux/kref.h> 36 #include <linux/mutex.h> 37 #ifndef CONFIG_OCFS2_COMPAT_JBD 38 # include <linux/jbd2.h> 39 #else 40 # include <linux/jbd.h> 41 # include "ocfs2_jbd_compat.h" 42 #endif 43 44 /* For union ocfs2_dlm_lksb */ 45 #include "stackglue.h" 46 47 #include "ocfs2_fs.h" 48 #include "ocfs2_lockid.h" 49 50 /* Most user visible OCFS2 inodes will have very few pieces of 51 * metadata, but larger files (including bitmaps, etc) must be taken 52 * into account when designing an access scheme. We allow a small 53 * amount of inlined blocks to be stored on an array and grow the 54 * structure into a rb tree when necessary. */ 55 #define OCFS2_INODE_MAX_CACHE_ARRAY 2 56 57 struct ocfs2_caching_info { 58 unsigned int ci_num_cached; 59 union { 60 sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY]; 61 struct rb_root ci_tree; 62 } ci_cache; 63 }; 64 65 /* this limits us to 256 nodes 66 * if we need more, we can do a kmalloc for the map */ 67 #define OCFS2_NODE_MAP_MAX_NODES 256 68 struct ocfs2_node_map { 69 u16 num_nodes; 70 unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)]; 71 }; 72 73 enum ocfs2_ast_action { 74 OCFS2_AST_INVALID = 0, 75 OCFS2_AST_ATTACH, 76 OCFS2_AST_CONVERT, 77 OCFS2_AST_DOWNCONVERT, 78 }; 79 80 /* actions for an unlockast function to take. */ 81 enum ocfs2_unlock_action { 82 OCFS2_UNLOCK_INVALID = 0, 83 OCFS2_UNLOCK_CANCEL_CONVERT, 84 OCFS2_UNLOCK_DROP_LOCK, 85 }; 86 87 /* ocfs2_lock_res->l_flags flags. */ 88 #define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized 89 * the lvb */ 90 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in 91 * dlm_lock */ 92 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to 93 * downconvert*/ 94 #define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */ 95 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010) 96 #define OCFS2_LOCK_REFRESHING (0x00000020) 97 #define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization 98 * for shutdown paths */ 99 #define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track 100 * when to skip queueing 101 * a lock because it's 102 * about to be 103 * dropped. */ 104 #define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */ 105 #define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */ 106 #define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a 107 call to dlm_lock. Only 108 exists with BUSY set. */ 109 110 struct ocfs2_lock_res_ops; 111 112 typedef void (*ocfs2_lock_callback)(int status, unsigned long data); 113 114 struct ocfs2_lock_res { 115 void *l_priv; 116 struct ocfs2_lock_res_ops *l_ops; 117 spinlock_t l_lock; 118 119 struct list_head l_blocked_list; 120 struct list_head l_mask_waiters; 121 122 enum ocfs2_lock_type l_type; 123 unsigned long l_flags; 124 char l_name[OCFS2_LOCK_ID_MAX_LEN]; 125 int l_level; 126 unsigned int l_ro_holders; 127 unsigned int l_ex_holders; 128 union ocfs2_dlm_lksb l_lksb; 129 130 /* used from AST/BAST funcs. */ 131 enum ocfs2_ast_action l_action; 132 enum ocfs2_unlock_action l_unlock_action; 133 int l_requested; 134 int l_blocking; 135 unsigned int l_pending_gen; 136 137 wait_queue_head_t l_event; 138 139 struct list_head l_debug_list; 140 141 #ifdef CONFIG_OCFS2_FS_STATS 142 unsigned long long l_lock_num_prmode; /* PR acquires */ 143 unsigned long long l_lock_num_exmode; /* EX acquires */ 144 unsigned int l_lock_num_prmode_failed; /* Failed PR gets */ 145 unsigned int l_lock_num_exmode_failed; /* Failed EX gets */ 146 unsigned long long l_lock_total_prmode; /* Tot wait for PR */ 147 unsigned long long l_lock_total_exmode; /* Tot wait for EX */ 148 unsigned int l_lock_max_prmode; /* Max wait for PR */ 149 unsigned int l_lock_max_exmode; /* Max wait for EX */ 150 unsigned int l_lock_refresh; /* Disk refreshes */ 151 #endif 152 }; 153 154 struct ocfs2_dlm_debug { 155 struct kref d_refcnt; 156 struct dentry *d_locking_state; 157 struct list_head d_lockres_tracking; 158 }; 159 160 enum ocfs2_vol_state 161 { 162 VOLUME_INIT = 0, 163 VOLUME_MOUNTED, 164 VOLUME_MOUNTED_QUOTAS, 165 VOLUME_DISMOUNTED, 166 VOLUME_DISABLED 167 }; 168 169 struct ocfs2_alloc_stats 170 { 171 atomic_t moves; 172 atomic_t local_data; 173 atomic_t bitmap_data; 174 atomic_t bg_allocs; 175 atomic_t bg_extends; 176 }; 177 178 enum ocfs2_local_alloc_state 179 { 180 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for 181 * this mountpoint. */ 182 OCFS2_LA_ENABLED, /* Local alloc is in use. */ 183 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number 184 * of bits has been reduced. */ 185 OCFS2_LA_DISABLED /* Local alloc has temporarily been 186 * disabled. */ 187 }; 188 189 enum ocfs2_mount_options 190 { 191 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */ 192 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ 193 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ 194 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ 195 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ 196 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */ 197 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */ 198 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */ 199 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* POSIX access control lists */ 200 OCFS2_MOUNT_USRQUOTA = 1 << 9, /* We support user quotas */ 201 OCFS2_MOUNT_GRPQUOTA = 1 << 10, /* We support group quotas */ 202 }; 203 204 #define OCFS2_OSB_SOFT_RO 0x0001 205 #define OCFS2_OSB_HARD_RO 0x0002 206 #define OCFS2_OSB_ERROR_FS 0x0004 207 #define OCFS2_DEFAULT_ATIME_QUANTUM 60 208 209 struct ocfs2_journal; 210 struct ocfs2_slot_info; 211 struct ocfs2_recovery_map; 212 struct ocfs2_quota_recovery; 213 struct ocfs2_dentry_lock; 214 struct ocfs2_super 215 { 216 struct task_struct *commit_task; 217 struct super_block *sb; 218 struct inode *root_inode; 219 struct inode *sys_root_inode; 220 struct inode *system_inodes[NUM_SYSTEM_INODES]; 221 222 struct ocfs2_slot_info *slot_info; 223 224 u32 *slot_recovery_generations; 225 226 spinlock_t node_map_lock; 227 228 u64 root_blkno; 229 u64 system_dir_blkno; 230 u64 bitmap_blkno; 231 u32 bitmap_cpg; 232 u8 *uuid; 233 char *uuid_str; 234 u32 uuid_hash; 235 u8 *vol_label; 236 u64 first_cluster_group_blkno; 237 u32 fs_generation; 238 239 u32 s_feature_compat; 240 u32 s_feature_incompat; 241 u32 s_feature_ro_compat; 242 243 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 244 * Could protect more on osb as it's very short lived. 245 */ 246 spinlock_t osb_lock; 247 u32 s_next_generation; 248 unsigned long osb_flags; 249 s16 s_inode_steal_slot; 250 atomic_t s_num_inodes_stolen; 251 252 unsigned long s_mount_opt; 253 unsigned int s_atime_quantum; 254 255 unsigned int max_slots; 256 unsigned int node_num; 257 int slot_num; 258 int preferred_slot; 259 int s_sectsize_bits; 260 int s_clustersize; 261 int s_clustersize_bits; 262 unsigned int s_xattr_inline_size; 263 264 atomic_t vol_state; 265 struct mutex recovery_lock; 266 struct ocfs2_recovery_map *recovery_map; 267 struct task_struct *recovery_thread_task; 268 int disable_recovery; 269 wait_queue_head_t checkpoint_event; 270 atomic_t needs_checkpoint; 271 struct ocfs2_journal *journal; 272 unsigned long osb_commit_interval; 273 274 struct delayed_work la_enable_wq; 275 276 /* 277 * Must hold local alloc i_mutex and osb->osb_lock to change 278 * local_alloc_bits. Reads can be done under either lock. 279 */ 280 unsigned int local_alloc_bits; 281 unsigned int local_alloc_default_bits; 282 283 enum ocfs2_local_alloc_state local_alloc_state; /* protected 284 * by osb_lock */ 285 286 struct buffer_head *local_alloc_bh; 287 288 u64 la_last_gd; 289 290 #ifdef CONFIG_OCFS2_FS_STATS 291 struct dentry *local_alloc_debug; 292 char *local_alloc_debug_buf; 293 #endif 294 295 /* Next three fields are for local node slot recovery during 296 * mount. */ 297 int dirty; 298 struct ocfs2_dinode *local_alloc_copy; 299 struct ocfs2_quota_recovery *quota_rec; 300 301 struct ocfs2_alloc_stats alloc_stats; 302 char dev_str[20]; /* "major,minor" of the device */ 303 304 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 305 struct ocfs2_cluster_connection *cconn; 306 struct ocfs2_lock_res osb_super_lockres; 307 struct ocfs2_lock_res osb_rename_lockres; 308 struct ocfs2_dlm_debug *osb_dlm_debug; 309 310 struct dentry *osb_debug_root; 311 312 wait_queue_head_t recovery_event; 313 314 spinlock_t dc_task_lock; 315 struct task_struct *dc_task; 316 wait_queue_head_t dc_event; 317 unsigned long dc_wake_sequence; 318 unsigned long dc_work_sequence; 319 320 /* 321 * Any thread can add locks to the list, but the downconvert 322 * thread is the only one allowed to remove locks. Any change 323 * to this rule requires updating 324 * ocfs2_downconvert_thread_do_work(). 325 */ 326 struct list_head blocked_lock_list; 327 unsigned long blocked_lock_count; 328 329 /* List of dentry locks to release. Anyone can add locks to 330 * the list, ocfs2_wq processes the list */ 331 struct ocfs2_dentry_lock *dentry_lock_list; 332 struct work_struct dentry_lock_work; 333 334 wait_queue_head_t osb_mount_event; 335 336 /* Truncate log info */ 337 struct inode *osb_tl_inode; 338 struct buffer_head *osb_tl_bh; 339 struct delayed_work osb_truncate_log_wq; 340 341 struct ocfs2_node_map osb_recovering_orphan_dirs; 342 unsigned int *osb_orphan_wipes; 343 wait_queue_head_t osb_wipe_event; 344 345 /* used to protect metaecc calculation check of xattr. */ 346 spinlock_t osb_xattr_lock; 347 }; 348 349 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 350 351 /* Useful typedef for passing around journal access functions */ 352 typedef int (*ocfs2_journal_access_func)(handle_t *handle, struct inode *inode, 353 struct buffer_head *bh, int type); 354 355 static inline int ocfs2_should_order_data(struct inode *inode) 356 { 357 if (!S_ISREG(inode->i_mode)) 358 return 0; 359 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 360 return 0; 361 return 1; 362 } 363 364 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 365 { 366 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 367 return 1; 368 return 0; 369 } 370 371 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 372 { 373 /* 374 * Support for sparse files is a pre-requisite 375 */ 376 if (!ocfs2_sparse_alloc(osb)) 377 return 0; 378 379 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 380 return 1; 381 return 0; 382 } 383 384 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 385 { 386 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 387 return 1; 388 return 0; 389 } 390 391 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 392 { 393 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 394 return 1; 395 return 0; 396 } 397 398 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 399 { 400 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 401 return 1; 402 return 0; 403 } 404 405 /* set / clear functions because cluster events can make these happen 406 * in parallel so we want the transitions to be atomic. this also 407 * means that any future flags osb_flags must be protected by spinlock 408 * too! */ 409 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 410 unsigned long flag) 411 { 412 spin_lock(&osb->osb_lock); 413 osb->osb_flags |= flag; 414 spin_unlock(&osb->osb_lock); 415 } 416 417 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 418 int hard) 419 { 420 spin_lock(&osb->osb_lock); 421 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 422 if (hard) 423 osb->osb_flags |= OCFS2_OSB_HARD_RO; 424 else 425 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 426 spin_unlock(&osb->osb_lock); 427 } 428 429 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 430 { 431 int ret; 432 433 spin_lock(&osb->osb_lock); 434 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 435 spin_unlock(&osb->osb_lock); 436 437 return ret; 438 } 439 440 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 441 { 442 int ret; 443 444 spin_lock(&osb->osb_lock); 445 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 446 spin_unlock(&osb->osb_lock); 447 448 return ret; 449 } 450 451 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) 452 { 453 return (osb->s_feature_incompat & 454 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK); 455 } 456 457 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 458 { 459 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 460 } 461 462 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 463 { 464 return (osb->s_feature_incompat & 465 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 466 } 467 468 469 #define OCFS2_IS_VALID_DINODE(ptr) \ 470 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 471 472 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 473 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 474 475 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 476 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 477 478 479 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 480 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 481 482 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 483 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 484 485 static inline unsigned long ino_from_blkno(struct super_block *sb, 486 u64 blkno) 487 { 488 return (unsigned long)(blkno & (u64)ULONG_MAX); 489 } 490 491 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 492 u32 clusters) 493 { 494 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 495 sb->s_blocksize_bits; 496 497 return (u64)clusters << c_to_b_bits; 498 } 499 500 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 501 u64 blocks) 502 { 503 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 504 sb->s_blocksize_bits; 505 506 return (u32)(blocks >> b_to_c_bits); 507 } 508 509 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 510 u64 bytes) 511 { 512 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 513 unsigned int clusters; 514 515 bytes += OCFS2_SB(sb)->s_clustersize - 1; 516 /* OCFS2 just cannot have enough clusters to overflow this */ 517 clusters = (unsigned int)(bytes >> cl_bits); 518 519 return clusters; 520 } 521 522 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 523 u64 bytes) 524 { 525 bytes += sb->s_blocksize - 1; 526 return bytes >> sb->s_blocksize_bits; 527 } 528 529 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 530 u32 clusters) 531 { 532 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 533 } 534 535 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 536 u64 bytes) 537 { 538 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 539 unsigned int clusters; 540 541 clusters = ocfs2_clusters_for_bytes(sb, bytes); 542 return (u64)clusters << cl_bits; 543 } 544 545 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 546 u64 bytes) 547 { 548 u64 blocks; 549 550 blocks = ocfs2_blocks_for_bytes(sb, bytes); 551 return blocks << sb->s_blocksize_bits; 552 } 553 554 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 555 { 556 return (unsigned long)((bytes + 511) >> 9); 557 } 558 559 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 560 unsigned long pg_index) 561 { 562 u32 clusters = pg_index; 563 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 564 565 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 566 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 567 else if (PAGE_CACHE_SHIFT < cbits) 568 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 569 570 return clusters; 571 } 572 573 /* 574 * Find the 1st page index which covers the given clusters. 575 */ 576 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 577 u32 clusters) 578 { 579 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 580 pgoff_t index = clusters; 581 582 if (PAGE_CACHE_SHIFT > cbits) { 583 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 584 } else if (PAGE_CACHE_SHIFT < cbits) { 585 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 586 } 587 588 return index; 589 } 590 591 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 592 { 593 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 594 unsigned int pages_per_cluster = 1; 595 596 if (PAGE_CACHE_SHIFT < cbits) 597 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 598 599 return pages_per_cluster; 600 } 601 602 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 603 unsigned int megs) 604 { 605 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 606 607 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 608 } 609 610 static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb) 611 { 612 spin_lock(&osb->osb_lock); 613 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT; 614 spin_unlock(&osb->osb_lock); 615 atomic_set(&osb->s_num_inodes_stolen, 0); 616 } 617 618 static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super *osb, 619 s16 slot) 620 { 621 spin_lock(&osb->osb_lock); 622 osb->s_inode_steal_slot = slot; 623 spin_unlock(&osb->osb_lock); 624 } 625 626 static inline s16 ocfs2_get_inode_steal_slot(struct ocfs2_super *osb) 627 { 628 s16 slot; 629 630 spin_lock(&osb->osb_lock); 631 slot = osb->s_inode_steal_slot; 632 spin_unlock(&osb->osb_lock); 633 634 return slot; 635 } 636 637 #define ocfs2_set_bit ext2_set_bit 638 #define ocfs2_clear_bit ext2_clear_bit 639 #define ocfs2_test_bit ext2_test_bit 640 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit 641 #define ocfs2_find_next_bit ext2_find_next_bit 642 #endif /* OCFS2_H */ 643 644