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 #include "reservations.h" 51 52 /* Caching of metadata buffers */ 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_CACHE_INFO_MAX_ARRAY 2 60 61 /* Flags for ocfs2_caching_info */ 62 63 enum ocfs2_caching_info_flags { 64 /* Indicates that the metadata cache is using the inline array */ 65 OCFS2_CACHE_FL_INLINE = 1<<1, 66 }; 67 68 struct ocfs2_caching_operations; 69 struct ocfs2_caching_info { 70 /* 71 * The parent structure provides the locks, but because the 72 * parent structure can differ, it provides locking operations 73 * to struct ocfs2_caching_info. 74 */ 75 const struct ocfs2_caching_operations *ci_ops; 76 77 /* next two are protected by trans_inc_lock */ 78 /* which transaction were we created on? Zero if none. */ 79 unsigned long ci_created_trans; 80 /* last transaction we were a part of. */ 81 unsigned long ci_last_trans; 82 83 /* Cache structures */ 84 unsigned int ci_flags; 85 unsigned int ci_num_cached; 86 union { 87 sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY]; 88 struct rb_root ci_tree; 89 } ci_cache; 90 }; 91 /* 92 * Need this prototype here instead of in uptodate.h because journal.h 93 * uses it. 94 */ 95 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci); 96 97 /* this limits us to 256 nodes 98 * if we need more, we can do a kmalloc for the map */ 99 #define OCFS2_NODE_MAP_MAX_NODES 256 100 struct ocfs2_node_map { 101 u16 num_nodes; 102 unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)]; 103 }; 104 105 enum ocfs2_ast_action { 106 OCFS2_AST_INVALID = 0, 107 OCFS2_AST_ATTACH, 108 OCFS2_AST_CONVERT, 109 OCFS2_AST_DOWNCONVERT, 110 }; 111 112 /* actions for an unlockast function to take. */ 113 enum ocfs2_unlock_action { 114 OCFS2_UNLOCK_INVALID = 0, 115 OCFS2_UNLOCK_CANCEL_CONVERT, 116 OCFS2_UNLOCK_DROP_LOCK, 117 }; 118 119 /* ocfs2_lock_res->l_flags flags. */ 120 #define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized 121 * the lvb */ 122 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in 123 * dlm_lock */ 124 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to 125 * downconvert*/ 126 #define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */ 127 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010) 128 #define OCFS2_LOCK_REFRESHING (0x00000020) 129 #define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization 130 * for shutdown paths */ 131 #define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track 132 * when to skip queueing 133 * a lock because it's 134 * about to be 135 * dropped. */ 136 #define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */ 137 #define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */ 138 #define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a 139 call to dlm_lock. Only 140 exists with BUSY set. */ 141 #define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread 142 * from downconverting 143 * before the upconvert 144 * has completed */ 145 146 struct ocfs2_lock_res_ops; 147 148 typedef void (*ocfs2_lock_callback)(int status, unsigned long data); 149 150 struct ocfs2_lock_res { 151 void *l_priv; 152 struct ocfs2_lock_res_ops *l_ops; 153 spinlock_t l_lock; 154 155 struct list_head l_blocked_list; 156 struct list_head l_mask_waiters; 157 158 enum ocfs2_lock_type l_type; 159 unsigned long l_flags; 160 char l_name[OCFS2_LOCK_ID_MAX_LEN]; 161 int l_level; 162 unsigned int l_ro_holders; 163 unsigned int l_ex_holders; 164 struct ocfs2_dlm_lksb l_lksb; 165 166 /* used from AST/BAST funcs. */ 167 enum ocfs2_ast_action l_action; 168 enum ocfs2_unlock_action l_unlock_action; 169 int l_requested; 170 int l_blocking; 171 unsigned int l_pending_gen; 172 173 wait_queue_head_t l_event; 174 175 struct list_head l_debug_list; 176 177 #ifdef CONFIG_OCFS2_FS_STATS 178 unsigned long long l_lock_num_prmode; /* PR acquires */ 179 unsigned long long l_lock_num_exmode; /* EX acquires */ 180 unsigned int l_lock_num_prmode_failed; /* Failed PR gets */ 181 unsigned int l_lock_num_exmode_failed; /* Failed EX gets */ 182 unsigned long long l_lock_total_prmode; /* Tot wait for PR */ 183 unsigned long long l_lock_total_exmode; /* Tot wait for EX */ 184 unsigned int l_lock_max_prmode; /* Max wait for PR */ 185 unsigned int l_lock_max_exmode; /* Max wait for EX */ 186 unsigned int l_lock_refresh; /* Disk refreshes */ 187 #endif 188 #ifdef CONFIG_DEBUG_LOCK_ALLOC 189 struct lockdep_map l_lockdep_map; 190 #endif 191 }; 192 193 enum ocfs2_orphan_scan_state { 194 ORPHAN_SCAN_ACTIVE, 195 ORPHAN_SCAN_INACTIVE 196 }; 197 198 struct ocfs2_orphan_scan { 199 struct mutex os_lock; 200 struct ocfs2_super *os_osb; 201 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */ 202 struct delayed_work os_orphan_scan_work; 203 struct timespec os_scantime; /* time this node ran the scan */ 204 u32 os_count; /* tracks node specific scans */ 205 u32 os_seqno; /* tracks cluster wide scans */ 206 atomic_t os_state; /* ACTIVE or INACTIVE */ 207 }; 208 209 struct ocfs2_dlm_debug { 210 struct kref d_refcnt; 211 struct dentry *d_locking_state; 212 struct list_head d_lockres_tracking; 213 }; 214 215 enum ocfs2_vol_state 216 { 217 VOLUME_INIT = 0, 218 VOLUME_MOUNTED, 219 VOLUME_MOUNTED_QUOTAS, 220 VOLUME_DISMOUNTED, 221 VOLUME_DISABLED 222 }; 223 224 struct ocfs2_alloc_stats 225 { 226 atomic_t moves; 227 atomic_t local_data; 228 atomic_t bitmap_data; 229 atomic_t bg_allocs; 230 atomic_t bg_extends; 231 }; 232 233 enum ocfs2_local_alloc_state 234 { 235 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for 236 * this mountpoint. */ 237 OCFS2_LA_ENABLED, /* Local alloc is in use. */ 238 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number 239 * of bits has been reduced. */ 240 OCFS2_LA_DISABLED /* Local alloc has temporarily been 241 * disabled. */ 242 }; 243 244 enum ocfs2_mount_options 245 { 246 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */ 247 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ 248 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ 249 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ 250 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ 251 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */ 252 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */ 253 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */ 254 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */ 255 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access 256 control lists */ 257 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */ 258 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */ 259 }; 260 261 #define OCFS2_OSB_SOFT_RO 0x0001 262 #define OCFS2_OSB_HARD_RO 0x0002 263 #define OCFS2_OSB_ERROR_FS 0x0004 264 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008 265 266 #define OCFS2_DEFAULT_ATIME_QUANTUM 60 267 268 struct ocfs2_journal; 269 struct ocfs2_slot_info; 270 struct ocfs2_recovery_map; 271 struct ocfs2_replay_map; 272 struct ocfs2_quota_recovery; 273 struct ocfs2_dentry_lock; 274 struct ocfs2_super 275 { 276 struct task_struct *commit_task; 277 struct super_block *sb; 278 struct inode *root_inode; 279 struct inode *sys_root_inode; 280 struct inode *system_inodes[NUM_SYSTEM_INODES]; 281 282 struct ocfs2_slot_info *slot_info; 283 284 u32 *slot_recovery_generations; 285 286 spinlock_t node_map_lock; 287 288 u64 root_blkno; 289 u64 system_dir_blkno; 290 u64 bitmap_blkno; 291 u32 bitmap_cpg; 292 u8 *uuid; 293 char *uuid_str; 294 u32 uuid_hash; 295 u8 *vol_label; 296 u64 first_cluster_group_blkno; 297 u32 fs_generation; 298 299 u32 s_feature_compat; 300 u32 s_feature_incompat; 301 u32 s_feature_ro_compat; 302 303 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 304 * Could protect more on osb as it's very short lived. 305 */ 306 spinlock_t osb_lock; 307 u32 s_next_generation; 308 unsigned long osb_flags; 309 s16 s_inode_steal_slot; 310 s16 s_meta_steal_slot; 311 atomic_t s_num_inodes_stolen; 312 atomic_t s_num_meta_stolen; 313 314 unsigned long s_mount_opt; 315 unsigned int s_atime_quantum; 316 317 unsigned int max_slots; 318 unsigned int node_num; 319 int slot_num; 320 int preferred_slot; 321 int s_sectsize_bits; 322 int s_clustersize; 323 int s_clustersize_bits; 324 unsigned int s_xattr_inline_size; 325 326 atomic_t vol_state; 327 struct mutex recovery_lock; 328 struct ocfs2_recovery_map *recovery_map; 329 struct ocfs2_replay_map *replay_map; 330 struct task_struct *recovery_thread_task; 331 int disable_recovery; 332 wait_queue_head_t checkpoint_event; 333 atomic_t needs_checkpoint; 334 struct ocfs2_journal *journal; 335 unsigned long osb_commit_interval; 336 337 struct delayed_work la_enable_wq; 338 339 /* 340 * Must hold local alloc i_mutex and osb->osb_lock to change 341 * local_alloc_bits. Reads can be done under either lock. 342 */ 343 unsigned int local_alloc_bits; 344 unsigned int local_alloc_default_bits; 345 /* osb_clusters_at_boot can become stale! Do not trust it to 346 * be up to date. */ 347 unsigned int osb_clusters_at_boot; 348 349 enum ocfs2_local_alloc_state local_alloc_state; /* protected 350 * by osb_lock */ 351 352 struct buffer_head *local_alloc_bh; 353 354 u64 la_last_gd; 355 356 struct ocfs2_reservation_map osb_la_resmap; 357 358 unsigned int osb_resv_level; 359 unsigned int osb_dir_resv_level; 360 361 /* Next three fields are for local node slot recovery during 362 * mount. */ 363 int dirty; 364 struct ocfs2_dinode *local_alloc_copy; 365 struct ocfs2_quota_recovery *quota_rec; 366 367 struct ocfs2_blockcheck_stats osb_ecc_stats; 368 struct ocfs2_alloc_stats alloc_stats; 369 char dev_str[20]; /* "major,minor" of the device */ 370 371 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 372 struct ocfs2_cluster_connection *cconn; 373 struct ocfs2_lock_res osb_super_lockres; 374 struct ocfs2_lock_res osb_rename_lockres; 375 struct ocfs2_lock_res osb_nfs_sync_lockres; 376 struct ocfs2_dlm_debug *osb_dlm_debug; 377 378 struct dentry *osb_debug_root; 379 struct dentry *osb_ctxt; 380 381 wait_queue_head_t recovery_event; 382 383 spinlock_t dc_task_lock; 384 struct task_struct *dc_task; 385 wait_queue_head_t dc_event; 386 unsigned long dc_wake_sequence; 387 unsigned long dc_work_sequence; 388 389 /* 390 * Any thread can add locks to the list, but the downconvert 391 * thread is the only one allowed to remove locks. Any change 392 * to this rule requires updating 393 * ocfs2_downconvert_thread_do_work(). 394 */ 395 struct list_head blocked_lock_list; 396 unsigned long blocked_lock_count; 397 398 /* List of dentry locks to release. Anyone can add locks to 399 * the list, ocfs2_wq processes the list */ 400 struct ocfs2_dentry_lock *dentry_lock_list; 401 struct work_struct dentry_lock_work; 402 403 wait_queue_head_t osb_mount_event; 404 405 /* Truncate log info */ 406 struct inode *osb_tl_inode; 407 struct buffer_head *osb_tl_bh; 408 struct delayed_work osb_truncate_log_wq; 409 410 struct ocfs2_node_map osb_recovering_orphan_dirs; 411 unsigned int *osb_orphan_wipes; 412 wait_queue_head_t osb_wipe_event; 413 414 struct ocfs2_orphan_scan osb_orphan_scan; 415 416 /* used to protect metaecc calculation check of xattr. */ 417 spinlock_t osb_xattr_lock; 418 419 unsigned int osb_dx_mask; 420 u32 osb_dx_seed[4]; 421 422 /* the group we used to allocate inodes. */ 423 u64 osb_inode_alloc_group; 424 425 /* rb tree root for refcount lock. */ 426 struct rb_root osb_rf_lock_tree; 427 struct ocfs2_refcount_tree *osb_ref_tree_lru; 428 }; 429 430 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 431 432 /* Useful typedef for passing around journal access functions */ 433 typedef int (*ocfs2_journal_access_func)(handle_t *handle, 434 struct ocfs2_caching_info *ci, 435 struct buffer_head *bh, int type); 436 437 static inline int ocfs2_should_order_data(struct inode *inode) 438 { 439 if (!S_ISREG(inode->i_mode)) 440 return 0; 441 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 442 return 0; 443 return 1; 444 } 445 446 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 447 { 448 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 449 return 1; 450 return 0; 451 } 452 453 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 454 { 455 /* 456 * Support for sparse files is a pre-requisite 457 */ 458 if (!ocfs2_sparse_alloc(osb)) 459 return 0; 460 461 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 462 return 1; 463 return 0; 464 } 465 466 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 467 { 468 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 469 return 1; 470 return 0; 471 } 472 473 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 474 { 475 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 476 return 1; 477 return 0; 478 } 479 480 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 481 { 482 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 483 return 1; 484 return 0; 485 } 486 487 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 488 { 489 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 490 return 1; 491 return 0; 492 } 493 494 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb) 495 { 496 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG) 497 return 1; 498 return 0; 499 } 500 501 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 502 { 503 if (ocfs2_supports_indexed_dirs(osb)) 504 return OCFS2_DX_LINK_MAX; 505 return OCFS2_LINK_MAX; 506 } 507 508 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 509 { 510 u32 nlink = le16_to_cpu(di->i_links_count); 511 u32 hi = le16_to_cpu(di->i_links_count_hi); 512 513 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 514 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 515 516 return nlink; 517 } 518 519 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 520 { 521 u16 lo, hi; 522 523 lo = nlink; 524 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 525 526 di->i_links_count = cpu_to_le16(lo); 527 di->i_links_count_hi = cpu_to_le16(hi); 528 } 529 530 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 531 { 532 u32 links = ocfs2_read_links_count(di); 533 534 links += n; 535 536 ocfs2_set_links_count(di, links); 537 } 538 539 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb) 540 { 541 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE) 542 return 1; 543 return 0; 544 } 545 546 /* set / clear functions because cluster events can make these happen 547 * in parallel so we want the transitions to be atomic. this also 548 * means that any future flags osb_flags must be protected by spinlock 549 * too! */ 550 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 551 unsigned long flag) 552 { 553 spin_lock(&osb->osb_lock); 554 osb->osb_flags |= flag; 555 spin_unlock(&osb->osb_lock); 556 } 557 558 559 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb, 560 unsigned long flag) 561 { 562 unsigned long ret; 563 564 spin_lock(&osb->osb_lock); 565 ret = osb->osb_flags & flag; 566 spin_unlock(&osb->osb_lock); 567 return ret; 568 } 569 570 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 571 int hard) 572 { 573 spin_lock(&osb->osb_lock); 574 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 575 if (hard) 576 osb->osb_flags |= OCFS2_OSB_HARD_RO; 577 else 578 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 579 spin_unlock(&osb->osb_lock); 580 } 581 582 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 583 { 584 int ret; 585 586 spin_lock(&osb->osb_lock); 587 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 588 spin_unlock(&osb->osb_lock); 589 590 return ret; 591 } 592 593 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 594 { 595 int ret; 596 597 spin_lock(&osb->osb_lock); 598 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 599 spin_unlock(&osb->osb_lock); 600 601 return ret; 602 } 603 604 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) 605 { 606 return (osb->s_feature_incompat & 607 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK); 608 } 609 610 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 611 { 612 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 613 } 614 615 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 616 { 617 return (osb->s_feature_incompat & 618 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 619 } 620 621 622 #define OCFS2_IS_VALID_DINODE(ptr) \ 623 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 624 625 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 626 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 627 628 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 629 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 630 631 632 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 633 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 634 635 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 636 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 637 638 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 639 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 640 641 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 642 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 643 644 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \ 645 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE)) 646 647 static inline unsigned long ino_from_blkno(struct super_block *sb, 648 u64 blkno) 649 { 650 return (unsigned long)(blkno & (u64)ULONG_MAX); 651 } 652 653 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 654 u32 clusters) 655 { 656 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 657 sb->s_blocksize_bits; 658 659 return (u64)clusters << c_to_b_bits; 660 } 661 662 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 663 u64 blocks) 664 { 665 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 666 sb->s_blocksize_bits; 667 668 return (u32)(blocks >> b_to_c_bits); 669 } 670 671 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 672 u64 bytes) 673 { 674 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 675 unsigned int clusters; 676 677 bytes += OCFS2_SB(sb)->s_clustersize - 1; 678 /* OCFS2 just cannot have enough clusters to overflow this */ 679 clusters = (unsigned int)(bytes >> cl_bits); 680 681 return clusters; 682 } 683 684 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 685 u64 bytes) 686 { 687 bytes += sb->s_blocksize - 1; 688 return bytes >> sb->s_blocksize_bits; 689 } 690 691 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 692 u32 clusters) 693 { 694 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 695 } 696 697 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 698 u64 blocks) 699 { 700 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 701 unsigned int clusters; 702 703 clusters = ocfs2_blocks_to_clusters(sb, blocks); 704 return (u64)clusters << bits; 705 } 706 707 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 708 u64 bytes) 709 { 710 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 711 unsigned int clusters; 712 713 clusters = ocfs2_clusters_for_bytes(sb, bytes); 714 return (u64)clusters << cl_bits; 715 } 716 717 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 718 u64 bytes) 719 { 720 u64 blocks; 721 722 blocks = ocfs2_blocks_for_bytes(sb, bytes); 723 return blocks << sb->s_blocksize_bits; 724 } 725 726 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 727 { 728 return (unsigned long)((bytes + 511) >> 9); 729 } 730 731 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 732 unsigned long pg_index) 733 { 734 u32 clusters = pg_index; 735 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 736 737 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 738 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 739 else if (PAGE_CACHE_SHIFT < cbits) 740 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 741 742 return clusters; 743 } 744 745 /* 746 * Find the 1st page index which covers the given clusters. 747 */ 748 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 749 u32 clusters) 750 { 751 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 752 pgoff_t index = clusters; 753 754 if (PAGE_CACHE_SHIFT > cbits) { 755 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 756 } else if (PAGE_CACHE_SHIFT < cbits) { 757 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 758 } 759 760 return index; 761 } 762 763 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 764 { 765 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 766 unsigned int pages_per_cluster = 1; 767 768 if (PAGE_CACHE_SHIFT < cbits) 769 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 770 771 return pages_per_cluster; 772 } 773 774 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 775 unsigned int megs) 776 { 777 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 778 779 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 780 } 781 782 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb, 783 unsigned int clusters) 784 { 785 return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits); 786 } 787 788 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap) 789 { 790 ext2_set_bit(bit, bitmap); 791 } 792 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr)) 793 794 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap) 795 { 796 ext2_clear_bit(bit, bitmap); 797 } 798 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr)) 799 800 #define ocfs2_test_bit ext2_test_bit 801 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit 802 #define ocfs2_find_next_bit ext2_find_next_bit 803 #endif /* OCFS2_H */ 804 805