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 46 /* For struct ocfs2_blockcheck_stats */ 47 #include "blockcheck.h" 48 49 50 /* Caching of metadata buffers */ 51 52 /* Most user visible OCFS2 inodes will have very few pieces of 53 * metadata, but larger files (including bitmaps, etc) must be taken 54 * into account when designing an access scheme. We allow a small 55 * amount of inlined blocks to be stored on an array and grow the 56 * structure into a rb tree when necessary. */ 57 #define OCFS2_CACHE_INFO_MAX_ARRAY 2 58 59 /* Flags for ocfs2_caching_info */ 60 61 enum ocfs2_caching_info_flags { 62 /* Indicates that the metadata cache is using the inline array */ 63 OCFS2_CACHE_FL_INLINE = 1<<1, 64 }; 65 66 struct ocfs2_caching_operations; 67 struct ocfs2_caching_info { 68 /* 69 * The parent structure provides the locks, but because the 70 * parent structure can differ, it provides locking operations 71 * to struct ocfs2_caching_info. 72 */ 73 const struct ocfs2_caching_operations *ci_ops; 74 75 /* next two are protected by trans_inc_lock */ 76 /* which transaction were we created on? Zero if none. */ 77 unsigned long ci_created_trans; 78 /* last transaction we were a part of. */ 79 unsigned long ci_last_trans; 80 81 /* Cache structures */ 82 unsigned int ci_flags; 83 unsigned int ci_num_cached; 84 union { 85 sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY]; 86 struct rb_root ci_tree; 87 } ci_cache; 88 }; 89 /* 90 * Need this prototype here instead of in uptodate.h because journal.h 91 * uses it. 92 */ 93 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci); 94 95 /* this limits us to 256 nodes 96 * if we need more, we can do a kmalloc for the map */ 97 #define OCFS2_NODE_MAP_MAX_NODES 256 98 struct ocfs2_node_map { 99 u16 num_nodes; 100 unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)]; 101 }; 102 103 enum ocfs2_ast_action { 104 OCFS2_AST_INVALID = 0, 105 OCFS2_AST_ATTACH, 106 OCFS2_AST_CONVERT, 107 OCFS2_AST_DOWNCONVERT, 108 }; 109 110 /* actions for an unlockast function to take. */ 111 enum ocfs2_unlock_action { 112 OCFS2_UNLOCK_INVALID = 0, 113 OCFS2_UNLOCK_CANCEL_CONVERT, 114 OCFS2_UNLOCK_DROP_LOCK, 115 }; 116 117 /* ocfs2_lock_res->l_flags flags. */ 118 #define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized 119 * the lvb */ 120 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in 121 * dlm_lock */ 122 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to 123 * downconvert*/ 124 #define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */ 125 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010) 126 #define OCFS2_LOCK_REFRESHING (0x00000020) 127 #define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization 128 * for shutdown paths */ 129 #define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track 130 * when to skip queueing 131 * a lock because it's 132 * about to be 133 * dropped. */ 134 #define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */ 135 #define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */ 136 #define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a 137 call to dlm_lock. Only 138 exists with BUSY set. */ 139 140 struct ocfs2_lock_res_ops; 141 142 typedef void (*ocfs2_lock_callback)(int status, unsigned long data); 143 144 struct ocfs2_lock_res { 145 void *l_priv; 146 struct ocfs2_lock_res_ops *l_ops; 147 spinlock_t l_lock; 148 149 struct list_head l_blocked_list; 150 struct list_head l_mask_waiters; 151 152 enum ocfs2_lock_type l_type; 153 unsigned long l_flags; 154 char l_name[OCFS2_LOCK_ID_MAX_LEN]; 155 int l_level; 156 unsigned int l_ro_holders; 157 unsigned int l_ex_holders; 158 union ocfs2_dlm_lksb l_lksb; 159 160 /* used from AST/BAST funcs. */ 161 enum ocfs2_ast_action l_action; 162 enum ocfs2_unlock_action l_unlock_action; 163 int l_requested; 164 int l_blocking; 165 unsigned int l_pending_gen; 166 167 wait_queue_head_t l_event; 168 169 struct list_head l_debug_list; 170 171 #ifdef CONFIG_OCFS2_FS_STATS 172 unsigned long long l_lock_num_prmode; /* PR acquires */ 173 unsigned long long l_lock_num_exmode; /* EX acquires */ 174 unsigned int l_lock_num_prmode_failed; /* Failed PR gets */ 175 unsigned int l_lock_num_exmode_failed; /* Failed EX gets */ 176 unsigned long long l_lock_total_prmode; /* Tot wait for PR */ 177 unsigned long long l_lock_total_exmode; /* Tot wait for EX */ 178 unsigned int l_lock_max_prmode; /* Max wait for PR */ 179 unsigned int l_lock_max_exmode; /* Max wait for EX */ 180 unsigned int l_lock_refresh; /* Disk refreshes */ 181 #endif 182 #ifdef CONFIG_DEBUG_LOCK_ALLOC 183 struct lockdep_map l_lockdep_map; 184 #endif 185 }; 186 187 enum ocfs2_orphan_scan_state { 188 ORPHAN_SCAN_ACTIVE, 189 ORPHAN_SCAN_INACTIVE 190 }; 191 192 struct ocfs2_orphan_scan { 193 struct mutex os_lock; 194 struct ocfs2_super *os_osb; 195 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */ 196 struct delayed_work os_orphan_scan_work; 197 struct timespec os_scantime; /* time this node ran the scan */ 198 u32 os_count; /* tracks node specific scans */ 199 u32 os_seqno; /* tracks cluster wide scans */ 200 atomic_t os_state; /* ACTIVE or INACTIVE */ 201 }; 202 203 struct ocfs2_dlm_debug { 204 struct kref d_refcnt; 205 struct dentry *d_locking_state; 206 struct list_head d_lockres_tracking; 207 }; 208 209 enum ocfs2_vol_state 210 { 211 VOLUME_INIT = 0, 212 VOLUME_MOUNTED, 213 VOLUME_MOUNTED_QUOTAS, 214 VOLUME_DISMOUNTED, 215 VOLUME_DISABLED 216 }; 217 218 struct ocfs2_alloc_stats 219 { 220 atomic_t moves; 221 atomic_t local_data; 222 atomic_t bitmap_data; 223 atomic_t bg_allocs; 224 atomic_t bg_extends; 225 }; 226 227 enum ocfs2_local_alloc_state 228 { 229 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for 230 * this mountpoint. */ 231 OCFS2_LA_ENABLED, /* Local alloc is in use. */ 232 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number 233 * of bits has been reduced. */ 234 OCFS2_LA_DISABLED /* Local alloc has temporarily been 235 * disabled. */ 236 }; 237 238 enum ocfs2_mount_options 239 { 240 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */ 241 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ 242 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ 243 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ 244 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ 245 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */ 246 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */ 247 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */ 248 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */ 249 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access 250 control lists */ 251 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */ 252 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */ 253 }; 254 255 #define OCFS2_OSB_SOFT_RO 0x0001 256 #define OCFS2_OSB_HARD_RO 0x0002 257 #define OCFS2_OSB_ERROR_FS 0x0004 258 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008 259 260 #define OCFS2_DEFAULT_ATIME_QUANTUM 60 261 262 struct ocfs2_journal; 263 struct ocfs2_slot_info; 264 struct ocfs2_recovery_map; 265 struct ocfs2_replay_map; 266 struct ocfs2_quota_recovery; 267 struct ocfs2_dentry_lock; 268 struct ocfs2_super 269 { 270 struct task_struct *commit_task; 271 struct super_block *sb; 272 struct inode *root_inode; 273 struct inode *sys_root_inode; 274 struct inode *system_inodes[NUM_SYSTEM_INODES]; 275 276 struct ocfs2_slot_info *slot_info; 277 278 u32 *slot_recovery_generations; 279 280 spinlock_t node_map_lock; 281 282 u64 root_blkno; 283 u64 system_dir_blkno; 284 u64 bitmap_blkno; 285 u32 bitmap_cpg; 286 u8 *uuid; 287 char *uuid_str; 288 u32 uuid_hash; 289 u8 *vol_label; 290 u64 first_cluster_group_blkno; 291 u32 fs_generation; 292 293 u32 s_feature_compat; 294 u32 s_feature_incompat; 295 u32 s_feature_ro_compat; 296 297 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 298 * Could protect more on osb as it's very short lived. 299 */ 300 spinlock_t osb_lock; 301 u32 s_next_generation; 302 unsigned long osb_flags; 303 s16 s_inode_steal_slot; 304 atomic_t s_num_inodes_stolen; 305 306 unsigned long s_mount_opt; 307 unsigned int s_atime_quantum; 308 309 unsigned int max_slots; 310 unsigned int node_num; 311 int slot_num; 312 int preferred_slot; 313 int s_sectsize_bits; 314 int s_clustersize; 315 int s_clustersize_bits; 316 unsigned int s_xattr_inline_size; 317 318 atomic_t vol_state; 319 struct mutex recovery_lock; 320 struct ocfs2_recovery_map *recovery_map; 321 struct ocfs2_replay_map *replay_map; 322 struct task_struct *recovery_thread_task; 323 int disable_recovery; 324 wait_queue_head_t checkpoint_event; 325 atomic_t needs_checkpoint; 326 struct ocfs2_journal *journal; 327 unsigned long osb_commit_interval; 328 329 struct delayed_work la_enable_wq; 330 331 /* 332 * Must hold local alloc i_mutex and osb->osb_lock to change 333 * local_alloc_bits. Reads can be done under either lock. 334 */ 335 unsigned int local_alloc_bits; 336 unsigned int local_alloc_default_bits; 337 338 enum ocfs2_local_alloc_state local_alloc_state; /* protected 339 * by osb_lock */ 340 341 struct buffer_head *local_alloc_bh; 342 343 u64 la_last_gd; 344 345 /* Next three fields are for local node slot recovery during 346 * mount. */ 347 int dirty; 348 struct ocfs2_dinode *local_alloc_copy; 349 struct ocfs2_quota_recovery *quota_rec; 350 351 struct ocfs2_blockcheck_stats osb_ecc_stats; 352 struct ocfs2_alloc_stats alloc_stats; 353 char dev_str[20]; /* "major,minor" of the device */ 354 355 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 356 struct ocfs2_cluster_connection *cconn; 357 struct ocfs2_lock_res osb_super_lockres; 358 struct ocfs2_lock_res osb_rename_lockres; 359 struct ocfs2_lock_res osb_nfs_sync_lockres; 360 struct ocfs2_dlm_debug *osb_dlm_debug; 361 362 struct dentry *osb_debug_root; 363 struct dentry *osb_ctxt; 364 365 wait_queue_head_t recovery_event; 366 367 spinlock_t dc_task_lock; 368 struct task_struct *dc_task; 369 wait_queue_head_t dc_event; 370 unsigned long dc_wake_sequence; 371 unsigned long dc_work_sequence; 372 373 /* 374 * Any thread can add locks to the list, but the downconvert 375 * thread is the only one allowed to remove locks. Any change 376 * to this rule requires updating 377 * ocfs2_downconvert_thread_do_work(). 378 */ 379 struct list_head blocked_lock_list; 380 unsigned long blocked_lock_count; 381 382 /* List of dentry locks to release. Anyone can add locks to 383 * the list, ocfs2_wq processes the list */ 384 struct ocfs2_dentry_lock *dentry_lock_list; 385 struct work_struct dentry_lock_work; 386 387 wait_queue_head_t osb_mount_event; 388 389 /* Truncate log info */ 390 struct inode *osb_tl_inode; 391 struct buffer_head *osb_tl_bh; 392 struct delayed_work osb_truncate_log_wq; 393 394 struct ocfs2_node_map osb_recovering_orphan_dirs; 395 unsigned int *osb_orphan_wipes; 396 wait_queue_head_t osb_wipe_event; 397 398 struct ocfs2_orphan_scan osb_orphan_scan; 399 400 /* used to protect metaecc calculation check of xattr. */ 401 spinlock_t osb_xattr_lock; 402 403 unsigned int osb_dx_mask; 404 u32 osb_dx_seed[4]; 405 406 /* the group we used to allocate inodes. */ 407 u64 osb_inode_alloc_group; 408 409 /* rb tree root for refcount lock. */ 410 struct rb_root osb_rf_lock_tree; 411 struct ocfs2_refcount_tree *osb_ref_tree_lru; 412 }; 413 414 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 415 416 /* Useful typedef for passing around journal access functions */ 417 typedef int (*ocfs2_journal_access_func)(handle_t *handle, 418 struct ocfs2_caching_info *ci, 419 struct buffer_head *bh, int type); 420 421 static inline int ocfs2_should_order_data(struct inode *inode) 422 { 423 if (!S_ISREG(inode->i_mode)) 424 return 0; 425 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 426 return 0; 427 return 1; 428 } 429 430 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 431 { 432 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 433 return 1; 434 return 0; 435 } 436 437 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 438 { 439 /* 440 * Support for sparse files is a pre-requisite 441 */ 442 if (!ocfs2_sparse_alloc(osb)) 443 return 0; 444 445 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 446 return 1; 447 return 0; 448 } 449 450 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 451 { 452 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 453 return 1; 454 return 0; 455 } 456 457 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 458 { 459 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 460 return 1; 461 return 0; 462 } 463 464 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 465 { 466 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 467 return 1; 468 return 0; 469 } 470 471 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 472 { 473 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 474 return 1; 475 return 0; 476 } 477 478 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 479 { 480 if (ocfs2_supports_indexed_dirs(osb)) 481 return OCFS2_DX_LINK_MAX; 482 return OCFS2_LINK_MAX; 483 } 484 485 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 486 { 487 u32 nlink = le16_to_cpu(di->i_links_count); 488 u32 hi = le16_to_cpu(di->i_links_count_hi); 489 490 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 491 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 492 493 return nlink; 494 } 495 496 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 497 { 498 u16 lo, hi; 499 500 lo = nlink; 501 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 502 503 di->i_links_count = cpu_to_le16(lo); 504 di->i_links_count_hi = cpu_to_le16(hi); 505 } 506 507 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 508 { 509 u32 links = ocfs2_read_links_count(di); 510 511 links += n; 512 513 ocfs2_set_links_count(di, links); 514 } 515 516 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb) 517 { 518 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE) 519 return 1; 520 return 0; 521 } 522 523 /* set / clear functions because cluster events can make these happen 524 * in parallel so we want the transitions to be atomic. this also 525 * means that any future flags osb_flags must be protected by spinlock 526 * too! */ 527 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 528 unsigned long flag) 529 { 530 spin_lock(&osb->osb_lock); 531 osb->osb_flags |= flag; 532 spin_unlock(&osb->osb_lock); 533 } 534 535 536 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb, 537 unsigned long flag) 538 { 539 unsigned long ret; 540 541 spin_lock(&osb->osb_lock); 542 ret = osb->osb_flags & flag; 543 spin_unlock(&osb->osb_lock); 544 return ret; 545 } 546 547 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 548 int hard) 549 { 550 spin_lock(&osb->osb_lock); 551 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 552 if (hard) 553 osb->osb_flags |= OCFS2_OSB_HARD_RO; 554 else 555 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 556 spin_unlock(&osb->osb_lock); 557 } 558 559 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 560 { 561 int ret; 562 563 spin_lock(&osb->osb_lock); 564 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 565 spin_unlock(&osb->osb_lock); 566 567 return ret; 568 } 569 570 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 571 { 572 int ret; 573 574 spin_lock(&osb->osb_lock); 575 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 576 spin_unlock(&osb->osb_lock); 577 578 return ret; 579 } 580 581 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) 582 { 583 return (osb->s_feature_incompat & 584 OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK); 585 } 586 587 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 588 { 589 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 590 } 591 592 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 593 { 594 return (osb->s_feature_incompat & 595 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 596 } 597 598 599 #define OCFS2_IS_VALID_DINODE(ptr) \ 600 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 601 602 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 603 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 604 605 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 606 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 607 608 609 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 610 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 611 612 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 613 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 614 615 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 616 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 617 618 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 619 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 620 621 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \ 622 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE)) 623 624 static inline unsigned long ino_from_blkno(struct super_block *sb, 625 u64 blkno) 626 { 627 return (unsigned long)(blkno & (u64)ULONG_MAX); 628 } 629 630 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 631 u32 clusters) 632 { 633 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 634 sb->s_blocksize_bits; 635 636 return (u64)clusters << c_to_b_bits; 637 } 638 639 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 640 u64 blocks) 641 { 642 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 643 sb->s_blocksize_bits; 644 645 return (u32)(blocks >> b_to_c_bits); 646 } 647 648 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 649 u64 bytes) 650 { 651 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 652 unsigned int clusters; 653 654 bytes += OCFS2_SB(sb)->s_clustersize - 1; 655 /* OCFS2 just cannot have enough clusters to overflow this */ 656 clusters = (unsigned int)(bytes >> cl_bits); 657 658 return clusters; 659 } 660 661 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 662 u64 bytes) 663 { 664 bytes += sb->s_blocksize - 1; 665 return bytes >> sb->s_blocksize_bits; 666 } 667 668 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 669 u32 clusters) 670 { 671 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 672 } 673 674 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 675 u64 blocks) 676 { 677 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 678 unsigned int clusters; 679 680 clusters = ocfs2_blocks_to_clusters(sb, blocks); 681 return (u64)clusters << bits; 682 } 683 684 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 685 u64 bytes) 686 { 687 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 688 unsigned int clusters; 689 690 clusters = ocfs2_clusters_for_bytes(sb, bytes); 691 return (u64)clusters << cl_bits; 692 } 693 694 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 695 u64 bytes) 696 { 697 u64 blocks; 698 699 blocks = ocfs2_blocks_for_bytes(sb, bytes); 700 return blocks << sb->s_blocksize_bits; 701 } 702 703 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 704 { 705 return (unsigned long)((bytes + 511) >> 9); 706 } 707 708 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 709 unsigned long pg_index) 710 { 711 u32 clusters = pg_index; 712 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 713 714 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 715 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 716 else if (PAGE_CACHE_SHIFT < cbits) 717 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 718 719 return clusters; 720 } 721 722 /* 723 * Find the 1st page index which covers the given clusters. 724 */ 725 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 726 u32 clusters) 727 { 728 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 729 pgoff_t index = clusters; 730 731 if (PAGE_CACHE_SHIFT > cbits) { 732 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 733 } else if (PAGE_CACHE_SHIFT < cbits) { 734 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 735 } 736 737 return index; 738 } 739 740 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 741 { 742 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 743 unsigned int pages_per_cluster = 1; 744 745 if (PAGE_CACHE_SHIFT < cbits) 746 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 747 748 return pages_per_cluster; 749 } 750 751 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 752 unsigned int megs) 753 { 754 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 755 756 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 757 } 758 759 static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb) 760 { 761 spin_lock(&osb->osb_lock); 762 osb->s_inode_steal_slot = OCFS2_INVALID_SLOT; 763 spin_unlock(&osb->osb_lock); 764 atomic_set(&osb->s_num_inodes_stolen, 0); 765 } 766 767 static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super *osb, 768 s16 slot) 769 { 770 spin_lock(&osb->osb_lock); 771 osb->s_inode_steal_slot = slot; 772 spin_unlock(&osb->osb_lock); 773 } 774 775 static inline s16 ocfs2_get_inode_steal_slot(struct ocfs2_super *osb) 776 { 777 s16 slot; 778 779 spin_lock(&osb->osb_lock); 780 slot = osb->s_inode_steal_slot; 781 spin_unlock(&osb->osb_lock); 782 783 return slot; 784 } 785 786 #define ocfs2_set_bit ext2_set_bit 787 #define ocfs2_clear_bit ext2_clear_bit 788 #define ocfs2_test_bit ext2_test_bit 789 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit 790 #define ocfs2_find_next_bit ext2_find_next_bit 791 #endif /* OCFS2_H */ 792 793