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; 153 154 155 struct list_head l_blocked_list; 156 struct list_head l_mask_waiters; 157 158 unsigned long l_flags; 159 char l_name[OCFS2_LOCK_ID_MAX_LEN]; 160 unsigned int l_ro_holders; 161 unsigned int l_ex_holders; 162 signed char l_level; 163 signed char l_requested; 164 signed char l_blocking; 165 166 /* Data packed - type enum ocfs2_lock_type */ 167 unsigned char l_type; 168 169 /* used from AST/BAST funcs. */ 170 /* Data packed - enum type ocfs2_ast_action */ 171 unsigned char l_action; 172 /* Data packed - enum type ocfs2_unlock_action */ 173 unsigned char l_unlock_action; 174 unsigned int l_pending_gen; 175 176 spinlock_t l_lock; 177 178 struct ocfs2_dlm_lksb l_lksb; 179 180 wait_queue_head_t l_event; 181 182 struct list_head l_debug_list; 183 184 #ifdef CONFIG_OCFS2_FS_STATS 185 unsigned long long l_lock_num_prmode; /* PR acquires */ 186 unsigned long long l_lock_num_exmode; /* EX acquires */ 187 unsigned int l_lock_num_prmode_failed; /* Failed PR gets */ 188 unsigned int l_lock_num_exmode_failed; /* Failed EX gets */ 189 unsigned long long l_lock_total_prmode; /* Tot wait for PR */ 190 unsigned long long l_lock_total_exmode; /* Tot wait for EX */ 191 unsigned int l_lock_max_prmode; /* Max wait for PR */ 192 unsigned int l_lock_max_exmode; /* Max wait for EX */ 193 unsigned int l_lock_refresh; /* Disk refreshes */ 194 #endif 195 #ifdef CONFIG_DEBUG_LOCK_ALLOC 196 struct lockdep_map l_lockdep_map; 197 #endif 198 }; 199 200 enum ocfs2_orphan_scan_state { 201 ORPHAN_SCAN_ACTIVE, 202 ORPHAN_SCAN_INACTIVE 203 }; 204 205 struct ocfs2_orphan_scan { 206 struct mutex os_lock; 207 struct ocfs2_super *os_osb; 208 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */ 209 struct delayed_work os_orphan_scan_work; 210 struct timespec os_scantime; /* time this node ran the scan */ 211 u32 os_count; /* tracks node specific scans */ 212 u32 os_seqno; /* tracks cluster wide scans */ 213 atomic_t os_state; /* ACTIVE or INACTIVE */ 214 }; 215 216 struct ocfs2_dlm_debug { 217 struct kref d_refcnt; 218 struct dentry *d_locking_state; 219 struct list_head d_lockres_tracking; 220 }; 221 222 enum ocfs2_vol_state 223 { 224 VOLUME_INIT = 0, 225 VOLUME_MOUNTED, 226 VOLUME_MOUNTED_QUOTAS, 227 VOLUME_DISMOUNTED, 228 VOLUME_DISABLED 229 }; 230 231 struct ocfs2_alloc_stats 232 { 233 atomic_t moves; 234 atomic_t local_data; 235 atomic_t bitmap_data; 236 atomic_t bg_allocs; 237 atomic_t bg_extends; 238 }; 239 240 enum ocfs2_local_alloc_state 241 { 242 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for 243 * this mountpoint. */ 244 OCFS2_LA_ENABLED, /* Local alloc is in use. */ 245 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number 246 * of bits has been reduced. */ 247 OCFS2_LA_DISABLED /* Local alloc has temporarily been 248 * disabled. */ 249 }; 250 251 enum ocfs2_mount_options 252 { 253 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */ 254 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ 255 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ 256 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ 257 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ 258 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */ 259 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */ 260 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */ 261 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */ 262 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access 263 control lists */ 264 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */ 265 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */ 266 OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT 267 writes */ 268 OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */ 269 OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */ 270 }; 271 272 #define OCFS2_OSB_SOFT_RO 0x0001 273 #define OCFS2_OSB_HARD_RO 0x0002 274 #define OCFS2_OSB_ERROR_FS 0x0004 275 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008 276 277 #define OCFS2_DEFAULT_ATIME_QUANTUM 60 278 279 struct ocfs2_journal; 280 struct ocfs2_slot_info; 281 struct ocfs2_recovery_map; 282 struct ocfs2_replay_map; 283 struct ocfs2_quota_recovery; 284 struct ocfs2_dentry_lock; 285 struct ocfs2_super 286 { 287 struct task_struct *commit_task; 288 struct super_block *sb; 289 struct inode *root_inode; 290 struct inode *sys_root_inode; 291 struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES]; 292 struct inode **local_system_inodes; 293 294 struct ocfs2_slot_info *slot_info; 295 296 u32 *slot_recovery_generations; 297 298 spinlock_t node_map_lock; 299 300 u64 root_blkno; 301 u64 system_dir_blkno; 302 u64 bitmap_blkno; 303 u32 bitmap_cpg; 304 u8 *uuid; 305 char *uuid_str; 306 u32 uuid_hash; 307 u8 *vol_label; 308 u64 first_cluster_group_blkno; 309 u32 fs_generation; 310 311 u32 s_feature_compat; 312 u32 s_feature_incompat; 313 u32 s_feature_ro_compat; 314 315 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 316 * Could protect more on osb as it's very short lived. 317 */ 318 spinlock_t osb_lock; 319 u32 s_next_generation; 320 unsigned long osb_flags; 321 s16 s_inode_steal_slot; 322 s16 s_meta_steal_slot; 323 atomic_t s_num_inodes_stolen; 324 atomic_t s_num_meta_stolen; 325 326 unsigned long s_mount_opt; 327 unsigned int s_atime_quantum; 328 329 unsigned int max_slots; 330 unsigned int node_num; 331 int slot_num; 332 int preferred_slot; 333 int s_sectsize_bits; 334 int s_clustersize; 335 int s_clustersize_bits; 336 unsigned int s_xattr_inline_size; 337 338 atomic_t vol_state; 339 struct mutex recovery_lock; 340 struct ocfs2_recovery_map *recovery_map; 341 struct ocfs2_replay_map *replay_map; 342 struct task_struct *recovery_thread_task; 343 int disable_recovery; 344 wait_queue_head_t checkpoint_event; 345 atomic_t needs_checkpoint; 346 struct ocfs2_journal *journal; 347 unsigned long osb_commit_interval; 348 349 struct delayed_work la_enable_wq; 350 351 /* 352 * Must hold local alloc i_mutex and osb->osb_lock to change 353 * local_alloc_bits. Reads can be done under either lock. 354 */ 355 unsigned int local_alloc_bits; 356 unsigned int local_alloc_default_bits; 357 /* osb_clusters_at_boot can become stale! Do not trust it to 358 * be up to date. */ 359 unsigned int osb_clusters_at_boot; 360 361 enum ocfs2_local_alloc_state local_alloc_state; /* protected 362 * by osb_lock */ 363 364 struct buffer_head *local_alloc_bh; 365 366 u64 la_last_gd; 367 368 struct ocfs2_reservation_map osb_la_resmap; 369 370 unsigned int osb_resv_level; 371 unsigned int osb_dir_resv_level; 372 373 /* Next three fields are for local node slot recovery during 374 * mount. */ 375 int dirty; 376 struct ocfs2_dinode *local_alloc_copy; 377 struct ocfs2_quota_recovery *quota_rec; 378 379 struct ocfs2_blockcheck_stats osb_ecc_stats; 380 struct ocfs2_alloc_stats alloc_stats; 381 char dev_str[20]; /* "major,minor" of the device */ 382 383 u8 osb_stackflags; 384 385 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 386 struct ocfs2_cluster_connection *cconn; 387 struct ocfs2_lock_res osb_super_lockres; 388 struct ocfs2_lock_res osb_rename_lockres; 389 struct ocfs2_lock_res osb_nfs_sync_lockres; 390 struct ocfs2_dlm_debug *osb_dlm_debug; 391 392 struct dentry *osb_debug_root; 393 struct dentry *osb_ctxt; 394 395 wait_queue_head_t recovery_event; 396 397 spinlock_t dc_task_lock; 398 struct task_struct *dc_task; 399 wait_queue_head_t dc_event; 400 unsigned long dc_wake_sequence; 401 unsigned long dc_work_sequence; 402 403 /* 404 * Any thread can add locks to the list, but the downconvert 405 * thread is the only one allowed to remove locks. Any change 406 * to this rule requires updating 407 * ocfs2_downconvert_thread_do_work(). 408 */ 409 struct list_head blocked_lock_list; 410 unsigned long blocked_lock_count; 411 412 /* List of dentry locks to release. Anyone can add locks to 413 * the list, ocfs2_wq processes the list */ 414 struct ocfs2_dentry_lock *dentry_lock_list; 415 struct work_struct dentry_lock_work; 416 417 wait_queue_head_t osb_mount_event; 418 419 /* Truncate log info */ 420 struct inode *osb_tl_inode; 421 struct buffer_head *osb_tl_bh; 422 struct delayed_work osb_truncate_log_wq; 423 /* 424 * How many clusters in our truncate log. 425 * It must be protected by osb_tl_inode->i_mutex. 426 */ 427 unsigned int truncated_clusters; 428 429 struct ocfs2_node_map osb_recovering_orphan_dirs; 430 unsigned int *osb_orphan_wipes; 431 wait_queue_head_t osb_wipe_event; 432 433 struct ocfs2_orphan_scan osb_orphan_scan; 434 435 /* used to protect metaecc calculation check of xattr. */ 436 spinlock_t osb_xattr_lock; 437 438 unsigned int osb_dx_mask; 439 u32 osb_dx_seed[4]; 440 441 /* the group we used to allocate inodes. */ 442 u64 osb_inode_alloc_group; 443 444 /* rb tree root for refcount lock. */ 445 struct rb_root osb_rf_lock_tree; 446 struct ocfs2_refcount_tree *osb_ref_tree_lru; 447 }; 448 449 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 450 451 /* Useful typedef for passing around journal access functions */ 452 typedef int (*ocfs2_journal_access_func)(handle_t *handle, 453 struct ocfs2_caching_info *ci, 454 struct buffer_head *bh, int type); 455 456 static inline int ocfs2_should_order_data(struct inode *inode) 457 { 458 if (!S_ISREG(inode->i_mode)) 459 return 0; 460 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 461 return 0; 462 return 1; 463 } 464 465 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 466 { 467 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 468 return 1; 469 return 0; 470 } 471 472 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 473 { 474 /* 475 * Support for sparse files is a pre-requisite 476 */ 477 if (!ocfs2_sparse_alloc(osb)) 478 return 0; 479 480 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 481 return 1; 482 return 0; 483 } 484 485 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 486 { 487 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 488 return 1; 489 return 0; 490 } 491 492 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 493 { 494 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 495 return 1; 496 return 0; 497 } 498 499 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 500 { 501 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 502 return 1; 503 return 0; 504 } 505 506 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 507 { 508 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 509 return 1; 510 return 0; 511 } 512 513 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb) 514 { 515 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG) 516 return 1; 517 return 0; 518 } 519 520 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 521 { 522 if (ocfs2_supports_indexed_dirs(osb)) 523 return OCFS2_DX_LINK_MAX; 524 return OCFS2_LINK_MAX; 525 } 526 527 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 528 { 529 u32 nlink = le16_to_cpu(di->i_links_count); 530 u32 hi = le16_to_cpu(di->i_links_count_hi); 531 532 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 533 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 534 535 return nlink; 536 } 537 538 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 539 { 540 u16 lo, hi; 541 542 lo = nlink; 543 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 544 545 di->i_links_count = cpu_to_le16(lo); 546 di->i_links_count_hi = cpu_to_le16(hi); 547 } 548 549 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 550 { 551 u32 links = ocfs2_read_links_count(di); 552 553 links += n; 554 555 ocfs2_set_links_count(di, links); 556 } 557 558 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb) 559 { 560 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE) 561 return 1; 562 return 0; 563 } 564 565 /* set / clear functions because cluster events can make these happen 566 * in parallel so we want the transitions to be atomic. this also 567 * means that any future flags osb_flags must be protected by spinlock 568 * too! */ 569 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 570 unsigned long flag) 571 { 572 spin_lock(&osb->osb_lock); 573 osb->osb_flags |= flag; 574 spin_unlock(&osb->osb_lock); 575 } 576 577 578 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb, 579 unsigned long flag) 580 { 581 unsigned long ret; 582 583 spin_lock(&osb->osb_lock); 584 ret = osb->osb_flags & flag; 585 spin_unlock(&osb->osb_lock); 586 return ret; 587 } 588 589 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 590 int hard) 591 { 592 spin_lock(&osb->osb_lock); 593 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 594 if (hard) 595 osb->osb_flags |= OCFS2_OSB_HARD_RO; 596 else 597 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 598 spin_unlock(&osb->osb_lock); 599 } 600 601 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 602 { 603 int ret; 604 605 spin_lock(&osb->osb_lock); 606 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 607 spin_unlock(&osb->osb_lock); 608 609 return ret; 610 } 611 612 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 613 { 614 int ret; 615 616 spin_lock(&osb->osb_lock); 617 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 618 spin_unlock(&osb->osb_lock); 619 620 return ret; 621 } 622 623 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb) 624 { 625 return (osb->s_feature_incompat & 626 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK | 627 OCFS2_FEATURE_INCOMPAT_CLUSTERINFO)); 628 } 629 630 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) 631 { 632 if (ocfs2_clusterinfo_valid(osb) && 633 memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK, 634 OCFS2_STACK_LABEL_LEN)) 635 return 1; 636 return 0; 637 } 638 639 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb) 640 { 641 if (ocfs2_clusterinfo_valid(osb) && 642 !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK, 643 OCFS2_STACK_LABEL_LEN)) 644 return 1; 645 return 0; 646 } 647 648 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb) 649 { 650 return ocfs2_o2cb_stack(osb) && 651 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT); 652 } 653 654 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 655 { 656 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 657 } 658 659 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 660 { 661 return (osb->s_feature_incompat & 662 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 663 } 664 665 666 #define OCFS2_IS_VALID_DINODE(ptr) \ 667 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 668 669 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 670 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 671 672 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 673 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 674 675 676 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 677 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 678 679 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 680 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 681 682 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 683 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 684 685 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 686 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 687 688 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \ 689 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE)) 690 691 static inline unsigned long ino_from_blkno(struct super_block *sb, 692 u64 blkno) 693 { 694 return (unsigned long)(blkno & (u64)ULONG_MAX); 695 } 696 697 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 698 u32 clusters) 699 { 700 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 701 sb->s_blocksize_bits; 702 703 return (u64)clusters << c_to_b_bits; 704 } 705 706 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 707 u64 blocks) 708 { 709 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 710 sb->s_blocksize_bits; 711 712 return (u32)(blocks >> b_to_c_bits); 713 } 714 715 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 716 u64 bytes) 717 { 718 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 719 unsigned int clusters; 720 721 bytes += OCFS2_SB(sb)->s_clustersize - 1; 722 /* OCFS2 just cannot have enough clusters to overflow this */ 723 clusters = (unsigned int)(bytes >> cl_bits); 724 725 return clusters; 726 } 727 728 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 729 u64 bytes) 730 { 731 bytes += sb->s_blocksize - 1; 732 return bytes >> sb->s_blocksize_bits; 733 } 734 735 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 736 u32 clusters) 737 { 738 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 739 } 740 741 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 742 u64 blocks) 743 { 744 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 745 unsigned int clusters; 746 747 clusters = ocfs2_blocks_to_clusters(sb, blocks); 748 return (u64)clusters << bits; 749 } 750 751 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 752 u64 bytes) 753 { 754 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 755 unsigned int clusters; 756 757 clusters = ocfs2_clusters_for_bytes(sb, bytes); 758 return (u64)clusters << cl_bits; 759 } 760 761 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 762 u64 bytes) 763 { 764 u64 blocks; 765 766 blocks = ocfs2_blocks_for_bytes(sb, bytes); 767 return blocks << sb->s_blocksize_bits; 768 } 769 770 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 771 { 772 return (unsigned long)((bytes + 511) >> 9); 773 } 774 775 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 776 unsigned long pg_index) 777 { 778 u32 clusters = pg_index; 779 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 780 781 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 782 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 783 else if (PAGE_CACHE_SHIFT < cbits) 784 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 785 786 return clusters; 787 } 788 789 /* 790 * Find the 1st page index which covers the given clusters. 791 */ 792 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 793 u32 clusters) 794 { 795 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 796 pgoff_t index = clusters; 797 798 if (PAGE_CACHE_SHIFT > cbits) { 799 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 800 } else if (PAGE_CACHE_SHIFT < cbits) { 801 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 802 } 803 804 return index; 805 } 806 807 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 808 { 809 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 810 unsigned int pages_per_cluster = 1; 811 812 if (PAGE_CACHE_SHIFT < cbits) 813 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 814 815 return pages_per_cluster; 816 } 817 818 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 819 unsigned int megs) 820 { 821 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 822 823 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 824 } 825 826 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb, 827 unsigned int clusters) 828 { 829 return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits); 830 } 831 832 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap) 833 { 834 ext2_set_bit(bit, bitmap); 835 } 836 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr)) 837 838 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap) 839 { 840 ext2_clear_bit(bit, bitmap); 841 } 842 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr)) 843 844 #define ocfs2_test_bit ext2_test_bit 845 #define ocfs2_find_next_zero_bit ext2_find_next_zero_bit 846 #define ocfs2_find_next_bit ext2_find_next_bit 847 #endif /* OCFS2_H */ 848 849