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 #include <linux/jbd2.h> 39 40 /* For union ocfs2_dlm_lksb */ 41 #include "stackglue.h" 42 43 #include "ocfs2_fs.h" 44 #include "ocfs2_lockid.h" 45 #include "ocfs2_ioctl.h" 46 47 /* For struct ocfs2_blockcheck_stats */ 48 #include "blockcheck.h" 49 50 51 /* Caching of metadata buffers */ 52 53 /* Most user visible OCFS2 inodes will have very few pieces of 54 * metadata, but larger files (including bitmaps, etc) must be taken 55 * into account when designing an access scheme. We allow a small 56 * amount of inlined blocks to be stored on an array and grow the 57 * structure into a rb tree when necessary. */ 58 #define OCFS2_CACHE_INFO_MAX_ARRAY 2 59 60 /* Flags for ocfs2_caching_info */ 61 62 enum ocfs2_caching_info_flags { 63 /* Indicates that the metadata cache is using the inline array */ 64 OCFS2_CACHE_FL_INLINE = 1<<1, 65 }; 66 67 struct ocfs2_caching_operations; 68 struct ocfs2_caching_info { 69 /* 70 * The parent structure provides the locks, but because the 71 * parent structure can differ, it provides locking operations 72 * to struct ocfs2_caching_info. 73 */ 74 const struct ocfs2_caching_operations *ci_ops; 75 76 /* next two are protected by trans_inc_lock */ 77 /* which transaction were we created on? Zero if none. */ 78 unsigned long ci_created_trans; 79 /* last transaction we were a part of. */ 80 unsigned long ci_last_trans; 81 82 /* Cache structures */ 83 unsigned int ci_flags; 84 unsigned int ci_num_cached; 85 union { 86 sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY]; 87 struct rb_root ci_tree; 88 } ci_cache; 89 }; 90 /* 91 * Need this prototype here instead of in uptodate.h because journal.h 92 * uses it. 93 */ 94 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci); 95 96 /* this limits us to 256 nodes 97 * if we need more, we can do a kmalloc for the map */ 98 #define OCFS2_NODE_MAP_MAX_NODES 256 99 struct ocfs2_node_map { 100 u16 num_nodes; 101 unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)]; 102 }; 103 104 enum ocfs2_ast_action { 105 OCFS2_AST_INVALID = 0, 106 OCFS2_AST_ATTACH, 107 OCFS2_AST_CONVERT, 108 OCFS2_AST_DOWNCONVERT, 109 }; 110 111 /* actions for an unlockast function to take. */ 112 enum ocfs2_unlock_action { 113 OCFS2_UNLOCK_INVALID = 0, 114 OCFS2_UNLOCK_CANCEL_CONVERT, 115 OCFS2_UNLOCK_DROP_LOCK, 116 }; 117 118 /* ocfs2_lock_res->l_flags flags. */ 119 #define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized 120 * the lvb */ 121 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in 122 * dlm_lock */ 123 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to 124 * downconvert*/ 125 #define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */ 126 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010) 127 #define OCFS2_LOCK_REFRESHING (0x00000020) 128 #define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization 129 * for shutdown paths */ 130 #define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track 131 * when to skip queueing 132 * a lock because it's 133 * about to be 134 * dropped. */ 135 #define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */ 136 #define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */ 137 #define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a 138 call to dlm_lock. Only 139 exists with BUSY set. */ 140 #define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread 141 * from downconverting 142 * before the upconvert 143 * has completed */ 144 145 struct ocfs2_lock_res_ops; 146 147 typedef void (*ocfs2_lock_callback)(int status, unsigned long data); 148 149 struct ocfs2_lock_res { 150 void *l_priv; 151 struct ocfs2_lock_res_ops *l_ops; 152 spinlock_t l_lock; 153 154 struct list_head l_blocked_list; 155 struct list_head l_mask_waiters; 156 157 enum ocfs2_lock_type l_type; 158 unsigned long l_flags; 159 char l_name[OCFS2_LOCK_ID_MAX_LEN]; 160 int l_level; 161 unsigned int l_ro_holders; 162 unsigned int l_ex_holders; 163 struct ocfs2_dlm_lksb l_lksb; 164 165 /* used from AST/BAST funcs. */ 166 enum ocfs2_ast_action l_action; 167 enum ocfs2_unlock_action l_unlock_action; 168 int l_requested; 169 int l_blocking; 170 unsigned int l_pending_gen; 171 172 wait_queue_head_t l_event; 173 174 struct list_head l_debug_list; 175 176 #ifdef CONFIG_OCFS2_FS_STATS 177 unsigned long long l_lock_num_prmode; /* PR acquires */ 178 unsigned long long l_lock_num_exmode; /* EX acquires */ 179 unsigned int l_lock_num_prmode_failed; /* Failed PR gets */ 180 unsigned int l_lock_num_exmode_failed; /* Failed EX gets */ 181 unsigned long long l_lock_total_prmode; /* Tot wait for PR */ 182 unsigned long long l_lock_total_exmode; /* Tot wait for EX */ 183 unsigned int l_lock_max_prmode; /* Max wait for PR */ 184 unsigned int l_lock_max_exmode; /* Max wait for EX */ 185 unsigned int l_lock_refresh; /* Disk refreshes */ 186 #endif 187 #ifdef CONFIG_DEBUG_LOCK_ALLOC 188 struct lockdep_map l_lockdep_map; 189 #endif 190 }; 191 192 enum ocfs2_orphan_scan_state { 193 ORPHAN_SCAN_ACTIVE, 194 ORPHAN_SCAN_INACTIVE 195 }; 196 197 struct ocfs2_orphan_scan { 198 struct mutex os_lock; 199 struct ocfs2_super *os_osb; 200 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */ 201 struct delayed_work os_orphan_scan_work; 202 struct timespec os_scantime; /* time this node ran the scan */ 203 u32 os_count; /* tracks node specific scans */ 204 u32 os_seqno; /* tracks cluster wide scans */ 205 atomic_t os_state; /* ACTIVE or INACTIVE */ 206 }; 207 208 struct ocfs2_dlm_debug { 209 struct kref d_refcnt; 210 struct dentry *d_locking_state; 211 struct list_head d_lockres_tracking; 212 }; 213 214 enum ocfs2_vol_state 215 { 216 VOLUME_INIT = 0, 217 VOLUME_MOUNTED, 218 VOLUME_MOUNTED_QUOTAS, 219 VOLUME_DISMOUNTED, 220 VOLUME_DISABLED 221 }; 222 223 struct ocfs2_alloc_stats 224 { 225 atomic_t moves; 226 atomic_t local_data; 227 atomic_t bitmap_data; 228 atomic_t bg_allocs; 229 atomic_t bg_extends; 230 }; 231 232 enum ocfs2_local_alloc_state 233 { 234 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for 235 * this mountpoint. */ 236 OCFS2_LA_ENABLED, /* Local alloc is in use. */ 237 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number 238 * of bits has been reduced. */ 239 OCFS2_LA_DISABLED /* Local alloc has temporarily been 240 * disabled. */ 241 }; 242 243 enum ocfs2_mount_options 244 { 245 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */ 246 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ 247 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ 248 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ 249 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ 250 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */ 251 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */ 252 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */ 253 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */ 254 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access 255 control lists */ 256 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */ 257 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */ 258 }; 259 260 #define OCFS2_OSB_SOFT_RO 0x0001 261 #define OCFS2_OSB_HARD_RO 0x0002 262 #define OCFS2_OSB_ERROR_FS 0x0004 263 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008 264 265 #define OCFS2_DEFAULT_ATIME_QUANTUM 60 266 267 struct ocfs2_journal; 268 struct ocfs2_slot_info; 269 struct ocfs2_recovery_map; 270 struct ocfs2_replay_map; 271 struct ocfs2_quota_recovery; 272 struct ocfs2_dentry_lock; 273 struct ocfs2_super 274 { 275 struct task_struct *commit_task; 276 struct super_block *sb; 277 struct inode *root_inode; 278 struct inode *sys_root_inode; 279 struct inode *system_inodes[NUM_SYSTEM_INODES]; 280 281 struct ocfs2_slot_info *slot_info; 282 283 u32 *slot_recovery_generations; 284 285 spinlock_t node_map_lock; 286 287 u64 root_blkno; 288 u64 system_dir_blkno; 289 u64 bitmap_blkno; 290 u32 bitmap_cpg; 291 u8 *uuid; 292 char *uuid_str; 293 u32 uuid_hash; 294 u8 *vol_label; 295 u64 first_cluster_group_blkno; 296 u32 fs_generation; 297 298 u32 s_feature_compat; 299 u32 s_feature_incompat; 300 u32 s_feature_ro_compat; 301 302 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 303 * Could protect more on osb as it's very short lived. 304 */ 305 spinlock_t osb_lock; 306 u32 s_next_generation; 307 unsigned long osb_flags; 308 s16 s_inode_steal_slot; 309 s16 s_meta_steal_slot; 310 atomic_t s_num_inodes_stolen; 311 atomic_t s_num_meta_stolen; 312 313 unsigned long s_mount_opt; 314 unsigned int s_atime_quantum; 315 316 unsigned int max_slots; 317 unsigned int node_num; 318 int slot_num; 319 int preferred_slot; 320 int s_sectsize_bits; 321 int s_clustersize; 322 int s_clustersize_bits; 323 unsigned int s_xattr_inline_size; 324 325 atomic_t vol_state; 326 struct mutex recovery_lock; 327 struct ocfs2_recovery_map *recovery_map; 328 struct ocfs2_replay_map *replay_map; 329 struct task_struct *recovery_thread_task; 330 int disable_recovery; 331 wait_queue_head_t checkpoint_event; 332 atomic_t needs_checkpoint; 333 struct ocfs2_journal *journal; 334 unsigned long osb_commit_interval; 335 336 struct delayed_work la_enable_wq; 337 338 /* 339 * Must hold local alloc i_mutex and osb->osb_lock to change 340 * local_alloc_bits. Reads can be done under either lock. 341 */ 342 unsigned int local_alloc_bits; 343 unsigned int local_alloc_default_bits; 344 345 enum ocfs2_local_alloc_state local_alloc_state; /* protected 346 * by osb_lock */ 347 348 struct buffer_head *local_alloc_bh; 349 350 u64 la_last_gd; 351 352 /* Next three fields are for local node slot recovery during 353 * mount. */ 354 int dirty; 355 struct ocfs2_dinode *local_alloc_copy; 356 struct ocfs2_quota_recovery *quota_rec; 357 358 struct ocfs2_blockcheck_stats osb_ecc_stats; 359 struct ocfs2_alloc_stats alloc_stats; 360 char dev_str[20]; /* "major,minor" of the device */ 361 362 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 363 struct ocfs2_cluster_connection *cconn; 364 struct ocfs2_lock_res osb_super_lockres; 365 struct ocfs2_lock_res osb_rename_lockres; 366 struct ocfs2_lock_res osb_nfs_sync_lockres; 367 struct ocfs2_dlm_debug *osb_dlm_debug; 368 369 struct dentry *osb_debug_root; 370 struct dentry *osb_ctxt; 371 372 wait_queue_head_t recovery_event; 373 374 spinlock_t dc_task_lock; 375 struct task_struct *dc_task; 376 wait_queue_head_t dc_event; 377 unsigned long dc_wake_sequence; 378 unsigned long dc_work_sequence; 379 380 /* 381 * Any thread can add locks to the list, but the downconvert 382 * thread is the only one allowed to remove locks. Any change 383 * to this rule requires updating 384 * ocfs2_downconvert_thread_do_work(). 385 */ 386 struct list_head blocked_lock_list; 387 unsigned long blocked_lock_count; 388 389 /* List of dentry locks to release. Anyone can add locks to 390 * the list, ocfs2_wq processes the list */ 391 struct ocfs2_dentry_lock *dentry_lock_list; 392 struct work_struct dentry_lock_work; 393 394 wait_queue_head_t osb_mount_event; 395 396 /* Truncate log info */ 397 struct inode *osb_tl_inode; 398 struct buffer_head *osb_tl_bh; 399 struct delayed_work osb_truncate_log_wq; 400 401 struct ocfs2_node_map osb_recovering_orphan_dirs; 402 unsigned int *osb_orphan_wipes; 403 wait_queue_head_t osb_wipe_event; 404 405 struct ocfs2_orphan_scan osb_orphan_scan; 406 407 /* used to protect metaecc calculation check of xattr. */ 408 spinlock_t osb_xattr_lock; 409 410 unsigned int osb_dx_mask; 411 u32 osb_dx_seed[4]; 412 413 /* the group we used to allocate inodes. */ 414 u64 osb_inode_alloc_group; 415 416 /* rb tree root for refcount lock. */ 417 struct rb_root osb_rf_lock_tree; 418 struct ocfs2_refcount_tree *osb_ref_tree_lru; 419 }; 420 421 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 422 423 /* Useful typedef for passing around journal access functions */ 424 typedef int (*ocfs2_journal_access_func)(handle_t *handle, 425 struct ocfs2_caching_info *ci, 426 struct buffer_head *bh, int type); 427 428 static inline int ocfs2_should_order_data(struct inode *inode) 429 { 430 if (!S_ISREG(inode->i_mode)) 431 return 0; 432 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 433 return 0; 434 return 1; 435 } 436 437 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 438 { 439 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 440 return 1; 441 return 0; 442 } 443 444 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 445 { 446 /* 447 * Support for sparse files is a pre-requisite 448 */ 449 if (!ocfs2_sparse_alloc(osb)) 450 return 0; 451 452 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 453 return 1; 454 return 0; 455 } 456 457 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 458 { 459 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 460 return 1; 461 return 0; 462 } 463 464 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 465 { 466 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 467 return 1; 468 return 0; 469 } 470 471 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 472 { 473 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 474 return 1; 475 return 0; 476 } 477 478 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 479 { 480 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 481 return 1; 482 return 0; 483 } 484 485 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 486 { 487 if (ocfs2_supports_indexed_dirs(osb)) 488 return OCFS2_DX_LINK_MAX; 489 return OCFS2_LINK_MAX; 490 } 491 492 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 493 { 494 u32 nlink = le16_to_cpu(di->i_links_count); 495 u32 hi = le16_to_cpu(di->i_links_count_hi); 496 497 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 498 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 499 500 return nlink; 501 } 502 503 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 504 { 505 u16 lo, hi; 506 507 lo = nlink; 508 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 509 510 di->i_links_count = cpu_to_le16(lo); 511 di->i_links_count_hi = cpu_to_le16(hi); 512 } 513 514 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 515 { 516 u32 links = ocfs2_read_links_count(di); 517 518 links += n; 519 520 ocfs2_set_links_count(di, links); 521 } 522 523 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb) 524 { 525 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE) 526 return 1; 527 return 0; 528 } 529 530 /* set / clear functions because cluster events can make these happen 531 * in parallel so we want the transitions to be atomic. this also 532 * means that any future flags osb_flags must be protected by spinlock 533 * too! */ 534 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 535 unsigned long flag) 536 { 537 spin_lock(&osb->osb_lock); 538 osb->osb_flags |= flag; 539 spin_unlock(&osb->osb_lock); 540 } 541 542 543 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb, 544 unsigned long flag) 545 { 546 unsigned long ret; 547 548 spin_lock(&osb->osb_lock); 549 ret = osb->osb_flags & flag; 550 spin_unlock(&osb->osb_lock); 551 return ret; 552 } 553 554 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 555 int hard) 556 { 557 spin_lock(&osb->osb_lock); 558 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 559 if (hard) 560 osb->osb_flags |= OCFS2_OSB_HARD_RO; 561 else 562 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 563 spin_unlock(&osb->osb_lock); 564 } 565 566 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 567 { 568 int ret; 569 570 spin_lock(&osb->osb_lock); 571 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 572 spin_unlock(&osb->osb_lock); 573 574 return ret; 575 } 576 577 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 578 { 579 int ret; 580 581 spin_lock(&osb->osb_lock); 582 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 583 spin_unlock(&osb->osb_lock); 584 585 return ret; 586 } 587 588 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) 589 { 590 return (osb->s_feature_incompat & 591 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK); 592 } 593 594 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 595 { 596 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 597 } 598 599 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 600 { 601 return (osb->s_feature_incompat & 602 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 603 } 604 605 606 #define OCFS2_IS_VALID_DINODE(ptr) \ 607 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 608 609 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 610 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 611 612 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 613 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 614 615 616 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 617 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 618 619 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 620 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 621 622 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 623 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 624 625 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 626 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 627 628 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \ 629 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE)) 630 631 static inline unsigned long ino_from_blkno(struct super_block *sb, 632 u64 blkno) 633 { 634 return (unsigned long)(blkno & (u64)ULONG_MAX); 635 } 636 637 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 638 u32 clusters) 639 { 640 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 641 sb->s_blocksize_bits; 642 643 return (u64)clusters << c_to_b_bits; 644 } 645 646 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 647 u64 blocks) 648 { 649 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 650 sb->s_blocksize_bits; 651 652 return (u32)(blocks >> b_to_c_bits); 653 } 654 655 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 656 u64 bytes) 657 { 658 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 659 unsigned int clusters; 660 661 bytes += OCFS2_SB(sb)->s_clustersize - 1; 662 /* OCFS2 just cannot have enough clusters to overflow this */ 663 clusters = (unsigned int)(bytes >> cl_bits); 664 665 return clusters; 666 } 667 668 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 669 u64 bytes) 670 { 671 bytes += sb->s_blocksize - 1; 672 return bytes >> sb->s_blocksize_bits; 673 } 674 675 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 676 u32 clusters) 677 { 678 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 679 } 680 681 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 682 u64 blocks) 683 { 684 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 685 unsigned int clusters; 686 687 clusters = ocfs2_blocks_to_clusters(sb, blocks); 688 return (u64)clusters << bits; 689 } 690 691 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 692 u64 bytes) 693 { 694 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 695 unsigned int clusters; 696 697 clusters = ocfs2_clusters_for_bytes(sb, bytes); 698 return (u64)clusters << cl_bits; 699 } 700 701 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 702 u64 bytes) 703 { 704 u64 blocks; 705 706 blocks = ocfs2_blocks_for_bytes(sb, bytes); 707 return blocks << sb->s_blocksize_bits; 708 } 709 710 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 711 { 712 return (unsigned long)((bytes + 511) >> 9); 713 } 714 715 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 716 unsigned long pg_index) 717 { 718 u32 clusters = pg_index; 719 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 720 721 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 722 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 723 else if (PAGE_CACHE_SHIFT < cbits) 724 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 725 726 return clusters; 727 } 728 729 /* 730 * Find the 1st page index which covers the given clusters. 731 */ 732 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 733 u32 clusters) 734 { 735 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 736 pgoff_t index = clusters; 737 738 if (PAGE_CACHE_SHIFT > cbits) { 739 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 740 } else if (PAGE_CACHE_SHIFT < cbits) { 741 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 742 } 743 744 return index; 745 } 746 747 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 748 { 749 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 750 unsigned int pages_per_cluster = 1; 751 752 if (PAGE_CACHE_SHIFT < cbits) 753 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 754 755 return pages_per_cluster; 756 } 757 758 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 759 unsigned int megs) 760 { 761 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 762 763 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 764 } 765 766 #define ocfs2_set_bit ext2_set_bit 767 #define ocfs2_clear_bit ext2_clear_bit 768 #define ocfs2_test_bit ext2_test_bit 769 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit 770 #define ocfs2_find_next_bit ext2_find_next_bit 771 #endif /* OCFS2_H */ 772 773