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 #include <linux/lockdep.h> 38 #ifndef CONFIG_OCFS2_COMPAT_JBD 39 # include <linux/jbd2.h> 40 #else 41 # include <linux/jbd.h> 42 # include "ocfs2_jbd_compat.h" 43 #endif 44 45 /* For union ocfs2_dlm_lksb */ 46 #include "stackglue.h" 47 48 #include "ocfs2_fs.h" 49 #include "ocfs2_lockid.h" 50 51 /* For struct ocfs2_blockcheck_stats */ 52 #include "blockcheck.h" 53 54 /* Most user visible OCFS2 inodes will have very few pieces of 55 * metadata, but larger files (including bitmaps, etc) must be taken 56 * into account when designing an access scheme. We allow a small 57 * amount of inlined blocks to be stored on an array and grow the 58 * structure into a rb tree when necessary. */ 59 #define OCFS2_INODE_MAX_CACHE_ARRAY 2 60 61 struct ocfs2_caching_info { 62 unsigned int ci_num_cached; 63 union { 64 sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY]; 65 struct rb_root ci_tree; 66 } ci_cache; 67 }; 68 69 /* this limits us to 256 nodes 70 * if we need more, we can do a kmalloc for the map */ 71 #define OCFS2_NODE_MAP_MAX_NODES 256 72 struct ocfs2_node_map { 73 u16 num_nodes; 74 unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)]; 75 }; 76 77 enum ocfs2_ast_action { 78 OCFS2_AST_INVALID = 0, 79 OCFS2_AST_ATTACH, 80 OCFS2_AST_CONVERT, 81 OCFS2_AST_DOWNCONVERT, 82 }; 83 84 /* actions for an unlockast function to take. */ 85 enum ocfs2_unlock_action { 86 OCFS2_UNLOCK_INVALID = 0, 87 OCFS2_UNLOCK_CANCEL_CONVERT, 88 OCFS2_UNLOCK_DROP_LOCK, 89 }; 90 91 /* ocfs2_lock_res->l_flags flags. */ 92 #define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized 93 * the lvb */ 94 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in 95 * dlm_lock */ 96 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to 97 * downconvert*/ 98 #define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */ 99 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010) 100 #define OCFS2_LOCK_REFRESHING (0x00000020) 101 #define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization 102 * for shutdown paths */ 103 #define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track 104 * when to skip queueing 105 * a lock because it's 106 * about to be 107 * dropped. */ 108 #define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */ 109 #define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */ 110 #define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a 111 call to dlm_lock. Only 112 exists with BUSY set. */ 113 114 struct ocfs2_lock_res_ops; 115 116 typedef void (*ocfs2_lock_callback)(int status, unsigned long data); 117 118 struct ocfs2_lock_res { 119 void *l_priv; 120 struct ocfs2_lock_res_ops *l_ops; 121 spinlock_t l_lock; 122 123 struct list_head l_blocked_list; 124 struct list_head l_mask_waiters; 125 126 enum ocfs2_lock_type l_type; 127 unsigned long l_flags; 128 char l_name[OCFS2_LOCK_ID_MAX_LEN]; 129 int l_level; 130 unsigned int l_ro_holders; 131 unsigned int l_ex_holders; 132 union ocfs2_dlm_lksb l_lksb; 133 134 /* used from AST/BAST funcs. */ 135 enum ocfs2_ast_action l_action; 136 enum ocfs2_unlock_action l_unlock_action; 137 int l_requested; 138 int l_blocking; 139 unsigned int l_pending_gen; 140 141 wait_queue_head_t l_event; 142 143 struct list_head l_debug_list; 144 145 #ifdef CONFIG_OCFS2_FS_STATS 146 unsigned long long l_lock_num_prmode; /* PR acquires */ 147 unsigned long long l_lock_num_exmode; /* EX acquires */ 148 unsigned int l_lock_num_prmode_failed; /* Failed PR gets */ 149 unsigned int l_lock_num_exmode_failed; /* Failed EX gets */ 150 unsigned long long l_lock_total_prmode; /* Tot wait for PR */ 151 unsigned long long l_lock_total_exmode; /* Tot wait for EX */ 152 unsigned int l_lock_max_prmode; /* Max wait for PR */ 153 unsigned int l_lock_max_exmode; /* Max wait for EX */ 154 unsigned int l_lock_refresh; /* Disk refreshes */ 155 #endif 156 #ifdef CONFIG_DEBUG_LOCK_ALLOC 157 struct lockdep_map l_lockdep_map; 158 #endif 159 }; 160 161 enum ocfs2_orphan_scan_state { 162 ORPHAN_SCAN_ACTIVE, 163 ORPHAN_SCAN_INACTIVE 164 }; 165 166 struct ocfs2_orphan_scan { 167 struct mutex os_lock; 168 struct ocfs2_super *os_osb; 169 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */ 170 struct delayed_work os_orphan_scan_work; 171 struct timespec os_scantime; /* time this node ran the scan */ 172 u32 os_count; /* tracks node specific scans */ 173 u32 os_seqno; /* tracks cluster wide scans */ 174 atomic_t os_state; /* ACTIVE or INACTIVE */ 175 }; 176 177 struct ocfs2_dlm_debug { 178 struct kref d_refcnt; 179 struct dentry *d_locking_state; 180 struct list_head d_lockres_tracking; 181 }; 182 183 enum ocfs2_vol_state 184 { 185 VOLUME_INIT = 0, 186 VOLUME_MOUNTED, 187 VOLUME_MOUNTED_QUOTAS, 188 VOLUME_DISMOUNTED, 189 VOLUME_DISABLED 190 }; 191 192 struct ocfs2_alloc_stats 193 { 194 atomic_t moves; 195 atomic_t local_data; 196 atomic_t bitmap_data; 197 atomic_t bg_allocs; 198 atomic_t bg_extends; 199 }; 200 201 enum ocfs2_local_alloc_state 202 { 203 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for 204 * this mountpoint. */ 205 OCFS2_LA_ENABLED, /* Local alloc is in use. */ 206 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number 207 * of bits has been reduced. */ 208 OCFS2_LA_DISABLED /* Local alloc has temporarily been 209 * disabled. */ 210 }; 211 212 enum ocfs2_mount_options 213 { 214 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */ 215 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ 216 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ 217 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ 218 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ 219 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */ 220 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */ 221 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */ 222 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* POSIX access control lists */ 223 OCFS2_MOUNT_USRQUOTA = 1 << 9, /* We support user quotas */ 224 OCFS2_MOUNT_GRPQUOTA = 1 << 10, /* We support group quotas */ 225 }; 226 227 #define OCFS2_OSB_SOFT_RO 0x0001 228 #define OCFS2_OSB_HARD_RO 0x0002 229 #define OCFS2_OSB_ERROR_FS 0x0004 230 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008 231 232 #define OCFS2_DEFAULT_ATIME_QUANTUM 60 233 234 struct ocfs2_journal; 235 struct ocfs2_slot_info; 236 struct ocfs2_recovery_map; 237 struct ocfs2_replay_map; 238 struct ocfs2_quota_recovery; 239 struct ocfs2_dentry_lock; 240 struct ocfs2_super 241 { 242 struct task_struct *commit_task; 243 struct super_block *sb; 244 struct inode *root_inode; 245 struct inode *sys_root_inode; 246 struct inode *system_inodes[NUM_SYSTEM_INODES]; 247 248 struct ocfs2_slot_info *slot_info; 249 250 u32 *slot_recovery_generations; 251 252 spinlock_t node_map_lock; 253 254 u64 root_blkno; 255 u64 system_dir_blkno; 256 u64 bitmap_blkno; 257 u32 bitmap_cpg; 258 u8 *uuid; 259 char *uuid_str; 260 u32 uuid_hash; 261 u8 *vol_label; 262 u64 first_cluster_group_blkno; 263 u32 fs_generation; 264 265 u32 s_feature_compat; 266 u32 s_feature_incompat; 267 u32 s_feature_ro_compat; 268 269 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 270 * Could protect more on osb as it's very short lived. 271 */ 272 spinlock_t osb_lock; 273 u32 s_next_generation; 274 unsigned long osb_flags; 275 s16 s_inode_steal_slot; 276 atomic_t s_num_inodes_stolen; 277 278 unsigned long s_mount_opt; 279 unsigned int s_atime_quantum; 280 281 unsigned int max_slots; 282 unsigned int node_num; 283 int slot_num; 284 int preferred_slot; 285 int s_sectsize_bits; 286 int s_clustersize; 287 int s_clustersize_bits; 288 unsigned int s_xattr_inline_size; 289 290 atomic_t vol_state; 291 struct mutex recovery_lock; 292 struct ocfs2_recovery_map *recovery_map; 293 struct ocfs2_replay_map *replay_map; 294 struct task_struct *recovery_thread_task; 295 int disable_recovery; 296 wait_queue_head_t checkpoint_event; 297 atomic_t needs_checkpoint; 298 struct ocfs2_journal *journal; 299 unsigned long osb_commit_interval; 300 301 struct delayed_work la_enable_wq; 302 303 /* 304 * Must hold local alloc i_mutex and osb->osb_lock to change 305 * local_alloc_bits. Reads can be done under either lock. 306 */ 307 unsigned int local_alloc_bits; 308 unsigned int local_alloc_default_bits; 309 310 enum ocfs2_local_alloc_state local_alloc_state; /* protected 311 * by osb_lock */ 312 313 struct buffer_head *local_alloc_bh; 314 315 u64 la_last_gd; 316 317 /* Next three fields are for local node slot recovery during 318 * mount. */ 319 int dirty; 320 struct ocfs2_dinode *local_alloc_copy; 321 struct ocfs2_quota_recovery *quota_rec; 322 323 struct ocfs2_blockcheck_stats osb_ecc_stats; 324 struct ocfs2_alloc_stats alloc_stats; 325 char dev_str[20]; /* "major,minor" of the device */ 326 327 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 328 struct ocfs2_cluster_connection *cconn; 329 struct ocfs2_lock_res osb_super_lockres; 330 struct ocfs2_lock_res osb_rename_lockres; 331 struct ocfs2_lock_res osb_nfs_sync_lockres; 332 struct ocfs2_dlm_debug *osb_dlm_debug; 333 334 struct dentry *osb_debug_root; 335 struct dentry *osb_ctxt; 336 337 wait_queue_head_t recovery_event; 338 339 spinlock_t dc_task_lock; 340 struct task_struct *dc_task; 341 wait_queue_head_t dc_event; 342 unsigned long dc_wake_sequence; 343 unsigned long dc_work_sequence; 344 345 /* 346 * Any thread can add locks to the list, but the downconvert 347 * thread is the only one allowed to remove locks. Any change 348 * to this rule requires updating 349 * ocfs2_downconvert_thread_do_work(). 350 */ 351 struct list_head blocked_lock_list; 352 unsigned long blocked_lock_count; 353 354 /* List of dentry locks to release. Anyone can add locks to 355 * the list, ocfs2_wq processes the list */ 356 struct ocfs2_dentry_lock *dentry_lock_list; 357 struct work_struct dentry_lock_work; 358 359 wait_queue_head_t osb_mount_event; 360 361 /* Truncate log info */ 362 struct inode *osb_tl_inode; 363 struct buffer_head *osb_tl_bh; 364 struct delayed_work osb_truncate_log_wq; 365 366 struct ocfs2_node_map osb_recovering_orphan_dirs; 367 unsigned int *osb_orphan_wipes; 368 wait_queue_head_t osb_wipe_event; 369 370 struct ocfs2_orphan_scan osb_orphan_scan; 371 372 /* used to protect metaecc calculation check of xattr. */ 373 spinlock_t osb_xattr_lock; 374 375 unsigned int osb_dx_mask; 376 u32 osb_dx_seed[4]; 377 378 /* the group we used to allocate inodes. */ 379 u64 osb_inode_alloc_group; 380 }; 381 382 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 383 384 /* Useful typedef for passing around journal access functions */ 385 typedef int (*ocfs2_journal_access_func)(handle_t *handle, struct inode *inode, 386 struct buffer_head *bh, int type); 387 388 static inline int ocfs2_should_order_data(struct inode *inode) 389 { 390 if (!S_ISREG(inode->i_mode)) 391 return 0; 392 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 393 return 0; 394 return 1; 395 } 396 397 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 398 { 399 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 400 return 1; 401 return 0; 402 } 403 404 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 405 { 406 /* 407 * Support for sparse files is a pre-requisite 408 */ 409 if (!ocfs2_sparse_alloc(osb)) 410 return 0; 411 412 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 413 return 1; 414 return 0; 415 } 416 417 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 418 { 419 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 420 return 1; 421 return 0; 422 } 423 424 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 425 { 426 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 427 return 1; 428 return 0; 429 } 430 431 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 432 { 433 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 434 return 1; 435 return 0; 436 } 437 438 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 439 { 440 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 441 return 1; 442 return 0; 443 } 444 445 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 446 { 447 if (ocfs2_supports_indexed_dirs(osb)) 448 return OCFS2_DX_LINK_MAX; 449 return OCFS2_LINK_MAX; 450 } 451 452 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 453 { 454 u32 nlink = le16_to_cpu(di->i_links_count); 455 u32 hi = le16_to_cpu(di->i_links_count_hi); 456 457 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 458 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 459 460 return nlink; 461 } 462 463 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 464 { 465 u16 lo, hi; 466 467 lo = nlink; 468 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 469 470 di->i_links_count = cpu_to_le16(lo); 471 di->i_links_count_hi = cpu_to_le16(hi); 472 } 473 474 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 475 { 476 u32 links = ocfs2_read_links_count(di); 477 478 links += n; 479 480 ocfs2_set_links_count(di, links); 481 } 482 483 /* set / clear functions because cluster events can make these happen 484 * in parallel so we want the transitions to be atomic. this also 485 * means that any future flags osb_flags must be protected by spinlock 486 * too! */ 487 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 488 unsigned long flag) 489 { 490 spin_lock(&osb->osb_lock); 491 osb->osb_flags |= flag; 492 spin_unlock(&osb->osb_lock); 493 } 494 495 496 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb, 497 unsigned long flag) 498 { 499 unsigned long ret; 500 501 spin_lock(&osb->osb_lock); 502 ret = osb->osb_flags & flag; 503 spin_unlock(&osb->osb_lock); 504 return ret; 505 } 506 507 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 508 int hard) 509 { 510 spin_lock(&osb->osb_lock); 511 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 512 if (hard) 513 osb->osb_flags |= OCFS2_OSB_HARD_RO; 514 else 515 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 516 spin_unlock(&osb->osb_lock); 517 } 518 519 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 520 { 521 int ret; 522 523 spin_lock(&osb->osb_lock); 524 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 525 spin_unlock(&osb->osb_lock); 526 527 return ret; 528 } 529 530 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 531 { 532 int ret; 533 534 spin_lock(&osb->osb_lock); 535 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 536 spin_unlock(&osb->osb_lock); 537 538 return ret; 539 } 540 541 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) 542 { 543 return (osb->s_feature_incompat & 544 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK); 545 } 546 547 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 548 { 549 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 550 } 551 552 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 553 { 554 return (osb->s_feature_incompat & 555 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 556 } 557 558 559 #define OCFS2_IS_VALID_DINODE(ptr) \ 560 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 561 562 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 563 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 564 565 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 566 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 567 568 569 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 570 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 571 572 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 573 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 574 575 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 576 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 577 578 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 579 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 580 581 static inline unsigned long ino_from_blkno(struct super_block *sb, 582 u64 blkno) 583 { 584 return (unsigned long)(blkno & (u64)ULONG_MAX); 585 } 586 587 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 588 u32 clusters) 589 { 590 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 591 sb->s_blocksize_bits; 592 593 return (u64)clusters << c_to_b_bits; 594 } 595 596 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 597 u64 blocks) 598 { 599 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 600 sb->s_blocksize_bits; 601 602 return (u32)(blocks >> b_to_c_bits); 603 } 604 605 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 606 u64 bytes) 607 { 608 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 609 unsigned int clusters; 610 611 bytes += OCFS2_SB(sb)->s_clustersize - 1; 612 /* OCFS2 just cannot have enough clusters to overflow this */ 613 clusters = (unsigned int)(bytes >> cl_bits); 614 615 return clusters; 616 } 617 618 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 619 u64 bytes) 620 { 621 bytes += sb->s_blocksize - 1; 622 return bytes >> sb->s_blocksize_bits; 623 } 624 625 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 626 u32 clusters) 627 { 628 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 629 } 630 631 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 632 u64 blocks) 633 { 634 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 635 unsigned int clusters; 636 637 clusters = ocfs2_blocks_to_clusters(sb, blocks); 638 return (u64)clusters << bits; 639 } 640 641 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 642 u64 bytes) 643 { 644 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 645 unsigned int clusters; 646 647 clusters = ocfs2_clusters_for_bytes(sb, bytes); 648 return (u64)clusters << cl_bits; 649 } 650 651 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 652 u64 bytes) 653 { 654 u64 blocks; 655 656 blocks = ocfs2_blocks_for_bytes(sb, bytes); 657 return blocks << sb->s_blocksize_bits; 658 } 659 660 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 661 { 662 return (unsigned long)((bytes + 511) >> 9); 663 } 664 665 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 666 unsigned long pg_index) 667 { 668 u32 clusters = pg_index; 669 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 670 671 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 672 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 673 else if (PAGE_CACHE_SHIFT < cbits) 674 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 675 676 return clusters; 677 } 678 679 /* 680 * Find the 1st page index which covers the given clusters. 681 */ 682 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 683 u32 clusters) 684 { 685 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 686 pgoff_t index = clusters; 687 688 if (PAGE_CACHE_SHIFT > cbits) { 689 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 690 } else if (PAGE_CACHE_SHIFT < cbits) { 691 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 692 } 693 694 return index; 695 } 696 697 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 698 { 699 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 700 unsigned int pages_per_cluster = 1; 701 702 if (PAGE_CACHE_SHIFT < cbits) 703 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 704 705 return pages_per_cluster; 706 } 707 708 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 709 unsigned int megs) 710 { 711 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 712 713 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 714 } 715 716 static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb) 717 { 718 spin_lock(&osb->osb_lock); 719 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT; 720 spin_unlock(&osb->osb_lock); 721 atomic_set(&osb->s_num_inodes_stolen, 0); 722 } 723 724 static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super *osb, 725 s16 slot) 726 { 727 spin_lock(&osb->osb_lock); 728 osb->s_inode_steal_slot = slot; 729 spin_unlock(&osb->osb_lock); 730 } 731 732 static inline s16 ocfs2_get_inode_steal_slot(struct ocfs2_super *osb) 733 { 734 s16 slot; 735 736 spin_lock(&osb->osb_lock); 737 slot = osb->s_inode_steal_slot; 738 spin_unlock(&osb->osb_lock); 739 740 return slot; 741 } 742 743 #define ocfs2_set_bit ext2_set_bit 744 #define ocfs2_clear_bit ext2_clear_bit 745 #define ocfs2_test_bit ext2_test_bit 746 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit 747 #define ocfs2_find_next_bit ext2_find_next_bit 748 #endif /* OCFS2_H */ 749 750