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_replay_map; 213 struct ocfs2_quota_recovery; 214 struct ocfs2_dentry_lock; 215 struct ocfs2_super 216 { 217 struct task_struct *commit_task; 218 struct super_block *sb; 219 struct inode *root_inode; 220 struct inode *sys_root_inode; 221 struct inode *system_inodes[NUM_SYSTEM_INODES]; 222 223 struct ocfs2_slot_info *slot_info; 224 225 u32 *slot_recovery_generations; 226 227 spinlock_t node_map_lock; 228 229 u64 root_blkno; 230 u64 system_dir_blkno; 231 u64 bitmap_blkno; 232 u32 bitmap_cpg; 233 u8 *uuid; 234 char *uuid_str; 235 u32 uuid_hash; 236 u8 *vol_label; 237 u64 first_cluster_group_blkno; 238 u32 fs_generation; 239 240 u32 s_feature_compat; 241 u32 s_feature_incompat; 242 u32 s_feature_ro_compat; 243 244 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 245 * Could protect more on osb as it's very short lived. 246 */ 247 spinlock_t osb_lock; 248 u32 s_next_generation; 249 unsigned long osb_flags; 250 s16 s_inode_steal_slot; 251 atomic_t s_num_inodes_stolen; 252 253 unsigned long s_mount_opt; 254 unsigned int s_atime_quantum; 255 256 unsigned int max_slots; 257 unsigned int node_num; 258 int slot_num; 259 int preferred_slot; 260 int s_sectsize_bits; 261 int s_clustersize; 262 int s_clustersize_bits; 263 unsigned int s_xattr_inline_size; 264 265 atomic_t vol_state; 266 struct mutex recovery_lock; 267 struct ocfs2_recovery_map *recovery_map; 268 struct ocfs2_replay_map *replay_map; 269 struct task_struct *recovery_thread_task; 270 int disable_recovery; 271 wait_queue_head_t checkpoint_event; 272 atomic_t needs_checkpoint; 273 struct ocfs2_journal *journal; 274 unsigned long osb_commit_interval; 275 276 struct delayed_work la_enable_wq; 277 278 /* 279 * Must hold local alloc i_mutex and osb->osb_lock to change 280 * local_alloc_bits. Reads can be done under either lock. 281 */ 282 unsigned int local_alloc_bits; 283 unsigned int local_alloc_default_bits; 284 285 enum ocfs2_local_alloc_state local_alloc_state; /* protected 286 * by osb_lock */ 287 288 struct buffer_head *local_alloc_bh; 289 290 u64 la_last_gd; 291 292 /* Next three fields are for local node slot recovery during 293 * mount. */ 294 int dirty; 295 struct ocfs2_dinode *local_alloc_copy; 296 struct ocfs2_quota_recovery *quota_rec; 297 298 struct ocfs2_alloc_stats alloc_stats; 299 char dev_str[20]; /* "major,minor" of the device */ 300 301 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 302 struct ocfs2_cluster_connection *cconn; 303 struct ocfs2_lock_res osb_super_lockres; 304 struct ocfs2_lock_res osb_rename_lockres; 305 struct ocfs2_lock_res osb_nfs_sync_lockres; 306 struct ocfs2_dlm_debug *osb_dlm_debug; 307 308 struct dentry *osb_debug_root; 309 struct dentry *osb_ctxt; 310 311 wait_queue_head_t recovery_event; 312 313 spinlock_t dc_task_lock; 314 struct task_struct *dc_task; 315 wait_queue_head_t dc_event; 316 unsigned long dc_wake_sequence; 317 unsigned long dc_work_sequence; 318 319 /* 320 * Any thread can add locks to the list, but the downconvert 321 * thread is the only one allowed to remove locks. Any change 322 * to this rule requires updating 323 * ocfs2_downconvert_thread_do_work(). 324 */ 325 struct list_head blocked_lock_list; 326 unsigned long blocked_lock_count; 327 328 /* List of dentry locks to release. Anyone can add locks to 329 * the list, ocfs2_wq processes the list */ 330 struct ocfs2_dentry_lock *dentry_lock_list; 331 struct work_struct dentry_lock_work; 332 333 wait_queue_head_t osb_mount_event; 334 335 /* Truncate log info */ 336 struct inode *osb_tl_inode; 337 struct buffer_head *osb_tl_bh; 338 struct delayed_work osb_truncate_log_wq; 339 340 struct ocfs2_node_map osb_recovering_orphan_dirs; 341 unsigned int *osb_orphan_wipes; 342 wait_queue_head_t osb_wipe_event; 343 344 /* used to protect metaecc calculation check of xattr. */ 345 spinlock_t osb_xattr_lock; 346 347 unsigned int osb_dx_mask; 348 u32 osb_dx_seed[4]; 349 350 /* the group we used to allocate inodes. */ 351 u64 osb_inode_alloc_group; 352 }; 353 354 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 355 356 /* Useful typedef for passing around journal access functions */ 357 typedef int (*ocfs2_journal_access_func)(handle_t *handle, struct inode *inode, 358 struct buffer_head *bh, int type); 359 360 static inline int ocfs2_should_order_data(struct inode *inode) 361 { 362 if (!S_ISREG(inode->i_mode)) 363 return 0; 364 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 365 return 0; 366 return 1; 367 } 368 369 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 370 { 371 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 372 return 1; 373 return 0; 374 } 375 376 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 377 { 378 /* 379 * Support for sparse files is a pre-requisite 380 */ 381 if (!ocfs2_sparse_alloc(osb)) 382 return 0; 383 384 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 385 return 1; 386 return 0; 387 } 388 389 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 390 { 391 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 392 return 1; 393 return 0; 394 } 395 396 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 397 { 398 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 399 return 1; 400 return 0; 401 } 402 403 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 404 { 405 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 406 return 1; 407 return 0; 408 } 409 410 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 411 { 412 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 413 return 1; 414 return 0; 415 } 416 417 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 418 { 419 if (ocfs2_supports_indexed_dirs(osb)) 420 return OCFS2_DX_LINK_MAX; 421 return OCFS2_LINK_MAX; 422 } 423 424 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 425 { 426 u32 nlink = le16_to_cpu(di->i_links_count); 427 u32 hi = le16_to_cpu(di->i_links_count_hi); 428 429 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 430 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 431 432 return nlink; 433 } 434 435 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 436 { 437 u16 lo, hi; 438 439 lo = nlink; 440 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 441 442 di->i_links_count = cpu_to_le16(lo); 443 di->i_links_count_hi = cpu_to_le16(hi); 444 } 445 446 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 447 { 448 u32 links = ocfs2_read_links_count(di); 449 450 links += n; 451 452 ocfs2_set_links_count(di, links); 453 } 454 455 /* set / clear functions because cluster events can make these happen 456 * in parallel so we want the transitions to be atomic. this also 457 * means that any future flags osb_flags must be protected by spinlock 458 * too! */ 459 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 460 unsigned long flag) 461 { 462 spin_lock(&osb->osb_lock); 463 osb->osb_flags |= flag; 464 spin_unlock(&osb->osb_lock); 465 } 466 467 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 468 int hard) 469 { 470 spin_lock(&osb->osb_lock); 471 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 472 if (hard) 473 osb->osb_flags |= OCFS2_OSB_HARD_RO; 474 else 475 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 476 spin_unlock(&osb->osb_lock); 477 } 478 479 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 480 { 481 int ret; 482 483 spin_lock(&osb->osb_lock); 484 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 485 spin_unlock(&osb->osb_lock); 486 487 return ret; 488 } 489 490 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 491 { 492 int ret; 493 494 spin_lock(&osb->osb_lock); 495 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 496 spin_unlock(&osb->osb_lock); 497 498 return ret; 499 } 500 501 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) 502 { 503 return (osb->s_feature_incompat & 504 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK); 505 } 506 507 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 508 { 509 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 510 } 511 512 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 513 { 514 return (osb->s_feature_incompat & 515 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 516 } 517 518 519 #define OCFS2_IS_VALID_DINODE(ptr) \ 520 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 521 522 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 523 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 524 525 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 526 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 527 528 529 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 530 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 531 532 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 533 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 534 535 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 536 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 537 538 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 539 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 540 541 static inline unsigned long ino_from_blkno(struct super_block *sb, 542 u64 blkno) 543 { 544 return (unsigned long)(blkno & (u64)ULONG_MAX); 545 } 546 547 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 548 u32 clusters) 549 { 550 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 551 sb->s_blocksize_bits; 552 553 return (u64)clusters << c_to_b_bits; 554 } 555 556 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 557 u64 blocks) 558 { 559 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 560 sb->s_blocksize_bits; 561 562 return (u32)(blocks >> b_to_c_bits); 563 } 564 565 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 566 u64 bytes) 567 { 568 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 569 unsigned int clusters; 570 571 bytes += OCFS2_SB(sb)->s_clustersize - 1; 572 /* OCFS2 just cannot have enough clusters to overflow this */ 573 clusters = (unsigned int)(bytes >> cl_bits); 574 575 return clusters; 576 } 577 578 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 579 u64 bytes) 580 { 581 bytes += sb->s_blocksize - 1; 582 return bytes >> sb->s_blocksize_bits; 583 } 584 585 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 586 u32 clusters) 587 { 588 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 589 } 590 591 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 592 u64 blocks) 593 { 594 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 595 unsigned int clusters; 596 597 clusters = ocfs2_blocks_to_clusters(sb, blocks); 598 return (u64)clusters << bits; 599 } 600 601 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 602 u64 bytes) 603 { 604 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 605 unsigned int clusters; 606 607 clusters = ocfs2_clusters_for_bytes(sb, bytes); 608 return (u64)clusters << cl_bits; 609 } 610 611 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 612 u64 bytes) 613 { 614 u64 blocks; 615 616 blocks = ocfs2_blocks_for_bytes(sb, bytes); 617 return blocks << sb->s_blocksize_bits; 618 } 619 620 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 621 { 622 return (unsigned long)((bytes + 511) >> 9); 623 } 624 625 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 626 unsigned long pg_index) 627 { 628 u32 clusters = pg_index; 629 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 630 631 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 632 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 633 else if (PAGE_CACHE_SHIFT < cbits) 634 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 635 636 return clusters; 637 } 638 639 /* 640 * Find the 1st page index which covers the given clusters. 641 */ 642 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 643 u32 clusters) 644 { 645 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 646 pgoff_t index = clusters; 647 648 if (PAGE_CACHE_SHIFT > cbits) { 649 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 650 } else if (PAGE_CACHE_SHIFT < cbits) { 651 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 652 } 653 654 return index; 655 } 656 657 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 658 { 659 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 660 unsigned int pages_per_cluster = 1; 661 662 if (PAGE_CACHE_SHIFT < cbits) 663 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 664 665 return pages_per_cluster; 666 } 667 668 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 669 unsigned int megs) 670 { 671 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 672 673 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 674 } 675 676 static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb) 677 { 678 spin_lock(&osb->osb_lock); 679 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT; 680 spin_unlock(&osb->osb_lock); 681 atomic_set(&osb->s_num_inodes_stolen, 0); 682 } 683 684 static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super *osb, 685 s16 slot) 686 { 687 spin_lock(&osb->osb_lock); 688 osb->s_inode_steal_slot = slot; 689 spin_unlock(&osb->osb_lock); 690 } 691 692 static inline s16 ocfs2_get_inode_steal_slot(struct ocfs2_super *osb) 693 { 694 s16 slot; 695 696 spin_lock(&osb->osb_lock); 697 slot = osb->s_inode_steal_slot; 698 spin_unlock(&osb->osb_lock); 699 700 return slot; 701 } 702 703 #define ocfs2_set_bit ext2_set_bit 704 #define ocfs2_clear_bit ext2_clear_bit 705 #define ocfs2_test_bit ext2_test_bit 706 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit 707 #define ocfs2_find_next_bit ext2_find_next_bit 708 #endif /* OCFS2_H */ 709 710