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_DEFAULT_ATIME_QUANTUM 60 231 232 struct ocfs2_journal; 233 struct ocfs2_slot_info; 234 struct ocfs2_recovery_map; 235 struct ocfs2_replay_map; 236 struct ocfs2_quota_recovery; 237 struct ocfs2_dentry_lock; 238 struct ocfs2_super 239 { 240 struct task_struct *commit_task; 241 struct super_block *sb; 242 struct inode *root_inode; 243 struct inode *sys_root_inode; 244 struct inode *system_inodes[NUM_SYSTEM_INODES]; 245 246 struct ocfs2_slot_info *slot_info; 247 248 u32 *slot_recovery_generations; 249 250 spinlock_t node_map_lock; 251 252 u64 root_blkno; 253 u64 system_dir_blkno; 254 u64 bitmap_blkno; 255 u32 bitmap_cpg; 256 u8 *uuid; 257 char *uuid_str; 258 u32 uuid_hash; 259 u8 *vol_label; 260 u64 first_cluster_group_blkno; 261 u32 fs_generation; 262 263 u32 s_feature_compat; 264 u32 s_feature_incompat; 265 u32 s_feature_ro_compat; 266 267 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 268 * Could protect more on osb as it's very short lived. 269 */ 270 spinlock_t osb_lock; 271 u32 s_next_generation; 272 unsigned long osb_flags; 273 s16 s_inode_steal_slot; 274 atomic_t s_num_inodes_stolen; 275 276 unsigned long s_mount_opt; 277 unsigned int s_atime_quantum; 278 279 unsigned int max_slots; 280 unsigned int node_num; 281 int slot_num; 282 int preferred_slot; 283 int s_sectsize_bits; 284 int s_clustersize; 285 int s_clustersize_bits; 286 unsigned int s_xattr_inline_size; 287 288 atomic_t vol_state; 289 struct mutex recovery_lock; 290 struct ocfs2_recovery_map *recovery_map; 291 struct ocfs2_replay_map *replay_map; 292 struct task_struct *recovery_thread_task; 293 int disable_recovery; 294 wait_queue_head_t checkpoint_event; 295 atomic_t needs_checkpoint; 296 struct ocfs2_journal *journal; 297 unsigned long osb_commit_interval; 298 299 struct delayed_work la_enable_wq; 300 301 /* 302 * Must hold local alloc i_mutex and osb->osb_lock to change 303 * local_alloc_bits. Reads can be done under either lock. 304 */ 305 unsigned int local_alloc_bits; 306 unsigned int local_alloc_default_bits; 307 308 enum ocfs2_local_alloc_state local_alloc_state; /* protected 309 * by osb_lock */ 310 311 struct buffer_head *local_alloc_bh; 312 313 u64 la_last_gd; 314 315 /* Next three fields are for local node slot recovery during 316 * mount. */ 317 int dirty; 318 struct ocfs2_dinode *local_alloc_copy; 319 struct ocfs2_quota_recovery *quota_rec; 320 321 struct ocfs2_blockcheck_stats osb_ecc_stats; 322 struct ocfs2_alloc_stats alloc_stats; 323 char dev_str[20]; /* "major,minor" of the device */ 324 325 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 326 struct ocfs2_cluster_connection *cconn; 327 struct ocfs2_lock_res osb_super_lockres; 328 struct ocfs2_lock_res osb_rename_lockres; 329 struct ocfs2_lock_res osb_nfs_sync_lockres; 330 struct ocfs2_dlm_debug *osb_dlm_debug; 331 332 struct dentry *osb_debug_root; 333 struct dentry *osb_ctxt; 334 335 wait_queue_head_t recovery_event; 336 337 spinlock_t dc_task_lock; 338 struct task_struct *dc_task; 339 wait_queue_head_t dc_event; 340 unsigned long dc_wake_sequence; 341 unsigned long dc_work_sequence; 342 343 /* 344 * Any thread can add locks to the list, but the downconvert 345 * thread is the only one allowed to remove locks. Any change 346 * to this rule requires updating 347 * ocfs2_downconvert_thread_do_work(). 348 */ 349 struct list_head blocked_lock_list; 350 unsigned long blocked_lock_count; 351 352 /* List of dentry locks to release. Anyone can add locks to 353 * the list, ocfs2_wq processes the list */ 354 struct ocfs2_dentry_lock *dentry_lock_list; 355 struct work_struct dentry_lock_work; 356 357 wait_queue_head_t osb_mount_event; 358 359 /* Truncate log info */ 360 struct inode *osb_tl_inode; 361 struct buffer_head *osb_tl_bh; 362 struct delayed_work osb_truncate_log_wq; 363 364 struct ocfs2_node_map osb_recovering_orphan_dirs; 365 unsigned int *osb_orphan_wipes; 366 wait_queue_head_t osb_wipe_event; 367 368 struct ocfs2_orphan_scan osb_orphan_scan; 369 370 /* used to protect metaecc calculation check of xattr. */ 371 spinlock_t osb_xattr_lock; 372 373 unsigned int osb_dx_mask; 374 u32 osb_dx_seed[4]; 375 376 /* the group we used to allocate inodes. */ 377 u64 osb_inode_alloc_group; 378 }; 379 380 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 381 382 /* Useful typedef for passing around journal access functions */ 383 typedef int (*ocfs2_journal_access_func)(handle_t *handle, struct inode *inode, 384 struct buffer_head *bh, int type); 385 386 static inline int ocfs2_should_order_data(struct inode *inode) 387 { 388 if (!S_ISREG(inode->i_mode)) 389 return 0; 390 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 391 return 0; 392 return 1; 393 } 394 395 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 396 { 397 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 398 return 1; 399 return 0; 400 } 401 402 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 403 { 404 /* 405 * Support for sparse files is a pre-requisite 406 */ 407 if (!ocfs2_sparse_alloc(osb)) 408 return 0; 409 410 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 411 return 1; 412 return 0; 413 } 414 415 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 416 { 417 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 418 return 1; 419 return 0; 420 } 421 422 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 423 { 424 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 425 return 1; 426 return 0; 427 } 428 429 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 430 { 431 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 432 return 1; 433 return 0; 434 } 435 436 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 437 { 438 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 439 return 1; 440 return 0; 441 } 442 443 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 444 { 445 if (ocfs2_supports_indexed_dirs(osb)) 446 return OCFS2_DX_LINK_MAX; 447 return OCFS2_LINK_MAX; 448 } 449 450 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 451 { 452 u32 nlink = le16_to_cpu(di->i_links_count); 453 u32 hi = le16_to_cpu(di->i_links_count_hi); 454 455 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 456 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 457 458 return nlink; 459 } 460 461 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 462 { 463 u16 lo, hi; 464 465 lo = nlink; 466 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 467 468 di->i_links_count = cpu_to_le16(lo); 469 di->i_links_count_hi = cpu_to_le16(hi); 470 } 471 472 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 473 { 474 u32 links = ocfs2_read_links_count(di); 475 476 links += n; 477 478 ocfs2_set_links_count(di, links); 479 } 480 481 /* set / clear functions because cluster events can make these happen 482 * in parallel so we want the transitions to be atomic. this also 483 * means that any future flags osb_flags must be protected by spinlock 484 * too! */ 485 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 486 unsigned long flag) 487 { 488 spin_lock(&osb->osb_lock); 489 osb->osb_flags |= flag; 490 spin_unlock(&osb->osb_lock); 491 } 492 493 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 494 int hard) 495 { 496 spin_lock(&osb->osb_lock); 497 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 498 if (hard) 499 osb->osb_flags |= OCFS2_OSB_HARD_RO; 500 else 501 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 502 spin_unlock(&osb->osb_lock); 503 } 504 505 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 506 { 507 int ret; 508 509 spin_lock(&osb->osb_lock); 510 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 511 spin_unlock(&osb->osb_lock); 512 513 return ret; 514 } 515 516 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 517 { 518 int ret; 519 520 spin_lock(&osb->osb_lock); 521 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 522 spin_unlock(&osb->osb_lock); 523 524 return ret; 525 } 526 527 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) 528 { 529 return (osb->s_feature_incompat & 530 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK); 531 } 532 533 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 534 { 535 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 536 } 537 538 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 539 { 540 return (osb->s_feature_incompat & 541 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 542 } 543 544 545 #define OCFS2_IS_VALID_DINODE(ptr) \ 546 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 547 548 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 549 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 550 551 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 552 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 553 554 555 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 556 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 557 558 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 559 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 560 561 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 562 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 563 564 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 565 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 566 567 static inline unsigned long ino_from_blkno(struct super_block *sb, 568 u64 blkno) 569 { 570 return (unsigned long)(blkno & (u64)ULONG_MAX); 571 } 572 573 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 574 u32 clusters) 575 { 576 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 577 sb->s_blocksize_bits; 578 579 return (u64)clusters << c_to_b_bits; 580 } 581 582 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 583 u64 blocks) 584 { 585 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 586 sb->s_blocksize_bits; 587 588 return (u32)(blocks >> b_to_c_bits); 589 } 590 591 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 592 u64 bytes) 593 { 594 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 595 unsigned int clusters; 596 597 bytes += OCFS2_SB(sb)->s_clustersize - 1; 598 /* OCFS2 just cannot have enough clusters to overflow this */ 599 clusters = (unsigned int)(bytes >> cl_bits); 600 601 return clusters; 602 } 603 604 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 605 u64 bytes) 606 { 607 bytes += sb->s_blocksize - 1; 608 return bytes >> sb->s_blocksize_bits; 609 } 610 611 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 612 u32 clusters) 613 { 614 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 615 } 616 617 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 618 u64 blocks) 619 { 620 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 621 unsigned int clusters; 622 623 clusters = ocfs2_blocks_to_clusters(sb, blocks); 624 return (u64)clusters << bits; 625 } 626 627 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 628 u64 bytes) 629 { 630 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 631 unsigned int clusters; 632 633 clusters = ocfs2_clusters_for_bytes(sb, bytes); 634 return (u64)clusters << cl_bits; 635 } 636 637 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 638 u64 bytes) 639 { 640 u64 blocks; 641 642 blocks = ocfs2_blocks_for_bytes(sb, bytes); 643 return blocks << sb->s_blocksize_bits; 644 } 645 646 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 647 { 648 return (unsigned long)((bytes + 511) >> 9); 649 } 650 651 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 652 unsigned long pg_index) 653 { 654 u32 clusters = pg_index; 655 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 656 657 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 658 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 659 else if (PAGE_CACHE_SHIFT < cbits) 660 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 661 662 return clusters; 663 } 664 665 /* 666 * Find the 1st page index which covers the given clusters. 667 */ 668 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 669 u32 clusters) 670 { 671 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 672 pgoff_t index = clusters; 673 674 if (PAGE_CACHE_SHIFT > cbits) { 675 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 676 } else if (PAGE_CACHE_SHIFT < cbits) { 677 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 678 } 679 680 return index; 681 } 682 683 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 684 { 685 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 686 unsigned int pages_per_cluster = 1; 687 688 if (PAGE_CACHE_SHIFT < cbits) 689 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 690 691 return pages_per_cluster; 692 } 693 694 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 695 unsigned int megs) 696 { 697 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 698 699 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 700 } 701 702 static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb) 703 { 704 spin_lock(&osb->osb_lock); 705 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT; 706 spin_unlock(&osb->osb_lock); 707 atomic_set(&osb->s_num_inodes_stolen, 0); 708 } 709 710 static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super *osb, 711 s16 slot) 712 { 713 spin_lock(&osb->osb_lock); 714 osb->s_inode_steal_slot = slot; 715 spin_unlock(&osb->osb_lock); 716 } 717 718 static inline s16 ocfs2_get_inode_steal_slot(struct ocfs2_super *osb) 719 { 720 s16 slot; 721 722 spin_lock(&osb->osb_lock); 723 slot = osb->s_inode_steal_slot; 724 spin_unlock(&osb->osb_lock); 725 726 return slot; 727 } 728 729 #define ocfs2_set_bit ext2_set_bit 730 #define ocfs2_clear_bit ext2_clear_bit 731 #define ocfs2_test_bit ext2_test_bit 732 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit 733 #define ocfs2_find_next_bit ext2_find_next_bit 734 #endif /* OCFS2_H */ 735 736