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 #ifdef CONFIG_OCFS2_FS_STATS 151 struct ocfs2_lock_stats { 152 u64 ls_total; /* Total wait in NSEC */ 153 u32 ls_gets; /* Num acquires */ 154 u32 ls_fail; /* Num failed acquires */ 155 156 /* Storing max wait in usecs saves 24 bytes per inode */ 157 u32 ls_max; /* Max wait in USEC */ 158 }; 159 #endif 160 161 struct ocfs2_lock_res { 162 void *l_priv; 163 struct ocfs2_lock_res_ops *l_ops; 164 165 166 struct list_head l_blocked_list; 167 struct list_head l_mask_waiters; 168 169 unsigned long l_flags; 170 char l_name[OCFS2_LOCK_ID_MAX_LEN]; 171 unsigned int l_ro_holders; 172 unsigned int l_ex_holders; 173 signed char l_level; 174 signed char l_requested; 175 signed char l_blocking; 176 177 /* Data packed - type enum ocfs2_lock_type */ 178 unsigned char l_type; 179 180 /* used from AST/BAST funcs. */ 181 /* Data packed - enum type ocfs2_ast_action */ 182 unsigned char l_action; 183 /* Data packed - enum type ocfs2_unlock_action */ 184 unsigned char l_unlock_action; 185 unsigned int l_pending_gen; 186 187 spinlock_t l_lock; 188 189 struct ocfs2_dlm_lksb l_lksb; 190 191 wait_queue_head_t l_event; 192 193 struct list_head l_debug_list; 194 195 #ifdef CONFIG_OCFS2_FS_STATS 196 struct ocfs2_lock_stats l_lock_prmode; /* PR mode stats */ 197 u32 l_lock_refresh; /* Disk refreshes */ 198 struct ocfs2_lock_stats l_lock_exmode; /* EX mode stats */ 199 #endif 200 #ifdef CONFIG_DEBUG_LOCK_ALLOC 201 struct lockdep_map l_lockdep_map; 202 #endif 203 }; 204 205 enum ocfs2_orphan_scan_state { 206 ORPHAN_SCAN_ACTIVE, 207 ORPHAN_SCAN_INACTIVE 208 }; 209 210 struct ocfs2_orphan_scan { 211 struct mutex os_lock; 212 struct ocfs2_super *os_osb; 213 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */ 214 struct delayed_work os_orphan_scan_work; 215 struct timespec os_scantime; /* time this node ran the scan */ 216 u32 os_count; /* tracks node specific scans */ 217 u32 os_seqno; /* tracks cluster wide scans */ 218 atomic_t os_state; /* ACTIVE or INACTIVE */ 219 }; 220 221 struct ocfs2_dlm_debug { 222 struct kref d_refcnt; 223 struct dentry *d_locking_state; 224 struct list_head d_lockres_tracking; 225 }; 226 227 enum ocfs2_vol_state 228 { 229 VOLUME_INIT = 0, 230 VOLUME_MOUNTED, 231 VOLUME_MOUNTED_QUOTAS, 232 VOLUME_DISMOUNTED, 233 VOLUME_DISABLED 234 }; 235 236 struct ocfs2_alloc_stats 237 { 238 atomic_t moves; 239 atomic_t local_data; 240 atomic_t bitmap_data; 241 atomic_t bg_allocs; 242 atomic_t bg_extends; 243 }; 244 245 enum ocfs2_local_alloc_state 246 { 247 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for 248 * this mountpoint. */ 249 OCFS2_LA_ENABLED, /* Local alloc is in use. */ 250 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number 251 * of bits has been reduced. */ 252 OCFS2_LA_DISABLED /* Local alloc has temporarily been 253 * disabled. */ 254 }; 255 256 enum ocfs2_mount_options 257 { 258 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */ 259 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ 260 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ 261 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ 262 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ 263 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */ 264 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */ 265 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */ 266 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */ 267 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access 268 control lists */ 269 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */ 270 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */ 271 OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT 272 writes */ 273 OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */ 274 OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */ 275 }; 276 277 #define OCFS2_OSB_SOFT_RO 0x0001 278 #define OCFS2_OSB_HARD_RO 0x0002 279 #define OCFS2_OSB_ERROR_FS 0x0004 280 #define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008 281 282 #define OCFS2_DEFAULT_ATIME_QUANTUM 60 283 284 struct ocfs2_journal; 285 struct ocfs2_slot_info; 286 struct ocfs2_recovery_map; 287 struct ocfs2_replay_map; 288 struct ocfs2_quota_recovery; 289 struct ocfs2_dentry_lock; 290 struct ocfs2_super 291 { 292 struct task_struct *commit_task; 293 struct super_block *sb; 294 struct inode *root_inode; 295 struct inode *sys_root_inode; 296 struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES]; 297 struct inode **local_system_inodes; 298 299 struct ocfs2_slot_info *slot_info; 300 301 u32 *slot_recovery_generations; 302 303 spinlock_t node_map_lock; 304 305 u64 root_blkno; 306 u64 system_dir_blkno; 307 u64 bitmap_blkno; 308 u32 bitmap_cpg; 309 u8 *uuid; 310 char *uuid_str; 311 u32 uuid_hash; 312 u8 *vol_label; 313 u64 first_cluster_group_blkno; 314 u32 fs_generation; 315 316 u32 s_feature_compat; 317 u32 s_feature_incompat; 318 u32 s_feature_ro_compat; 319 320 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 321 * Could protect more on osb as it's very short lived. 322 */ 323 spinlock_t osb_lock; 324 u32 s_next_generation; 325 unsigned long osb_flags; 326 s16 s_inode_steal_slot; 327 s16 s_meta_steal_slot; 328 atomic_t s_num_inodes_stolen; 329 atomic_t s_num_meta_stolen; 330 331 unsigned long s_mount_opt; 332 unsigned int s_atime_quantum; 333 334 unsigned int max_slots; 335 unsigned int node_num; 336 int slot_num; 337 int preferred_slot; 338 int s_sectsize_bits; 339 int s_clustersize; 340 int s_clustersize_bits; 341 unsigned int s_xattr_inline_size; 342 343 atomic_t vol_state; 344 struct mutex recovery_lock; 345 struct ocfs2_recovery_map *recovery_map; 346 struct ocfs2_replay_map *replay_map; 347 struct task_struct *recovery_thread_task; 348 int disable_recovery; 349 wait_queue_head_t checkpoint_event; 350 struct ocfs2_journal *journal; 351 unsigned long osb_commit_interval; 352 353 struct delayed_work la_enable_wq; 354 355 /* 356 * Must hold local alloc i_mutex and osb->osb_lock to change 357 * local_alloc_bits. Reads can be done under either lock. 358 */ 359 unsigned int local_alloc_bits; 360 unsigned int local_alloc_default_bits; 361 /* osb_clusters_at_boot can become stale! Do not trust it to 362 * be up to date. */ 363 unsigned int osb_clusters_at_boot; 364 365 enum ocfs2_local_alloc_state local_alloc_state; /* protected 366 * by osb_lock */ 367 368 struct buffer_head *local_alloc_bh; 369 370 u64 la_last_gd; 371 372 struct ocfs2_reservation_map osb_la_resmap; 373 374 unsigned int osb_resv_level; 375 unsigned int osb_dir_resv_level; 376 377 /* Next three fields are for local node slot recovery during 378 * mount. */ 379 int dirty; 380 struct ocfs2_dinode *local_alloc_copy; 381 struct ocfs2_quota_recovery *quota_rec; 382 383 struct ocfs2_blockcheck_stats osb_ecc_stats; 384 struct ocfs2_alloc_stats alloc_stats; 385 char dev_str[20]; /* "major,minor" of the device */ 386 387 u8 osb_stackflags; 388 389 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 390 struct ocfs2_cluster_connection *cconn; 391 struct ocfs2_lock_res osb_super_lockres; 392 struct ocfs2_lock_res osb_rename_lockres; 393 struct ocfs2_lock_res osb_nfs_sync_lockres; 394 struct ocfs2_dlm_debug *osb_dlm_debug; 395 396 struct dentry *osb_debug_root; 397 struct dentry *osb_ctxt; 398 399 wait_queue_head_t recovery_event; 400 401 spinlock_t dc_task_lock; 402 struct task_struct *dc_task; 403 wait_queue_head_t dc_event; 404 unsigned long dc_wake_sequence; 405 unsigned long dc_work_sequence; 406 407 /* 408 * Any thread can add locks to the list, but the downconvert 409 * thread is the only one allowed to remove locks. Any change 410 * to this rule requires updating 411 * ocfs2_downconvert_thread_do_work(). 412 */ 413 struct list_head blocked_lock_list; 414 unsigned long blocked_lock_count; 415 416 /* List of dentry locks to release. Anyone can add locks to 417 * the list, ocfs2_wq processes the list */ 418 struct ocfs2_dentry_lock *dentry_lock_list; 419 struct work_struct dentry_lock_work; 420 421 wait_queue_head_t osb_mount_event; 422 423 /* Truncate log info */ 424 struct inode *osb_tl_inode; 425 struct buffer_head *osb_tl_bh; 426 struct delayed_work osb_truncate_log_wq; 427 /* 428 * How many clusters in our truncate log. 429 * It must be protected by osb_tl_inode->i_mutex. 430 */ 431 unsigned int truncated_clusters; 432 433 struct ocfs2_node_map osb_recovering_orphan_dirs; 434 unsigned int *osb_orphan_wipes; 435 wait_queue_head_t osb_wipe_event; 436 437 struct ocfs2_orphan_scan osb_orphan_scan; 438 439 /* used to protect metaecc calculation check of xattr. */ 440 spinlock_t osb_xattr_lock; 441 442 unsigned int osb_dx_mask; 443 u32 osb_dx_seed[4]; 444 445 /* the group we used to allocate inodes. */ 446 u64 osb_inode_alloc_group; 447 448 /* rb tree root for refcount lock. */ 449 struct rb_root osb_rf_lock_tree; 450 struct ocfs2_refcount_tree *osb_ref_tree_lru; 451 }; 452 453 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 454 455 /* Useful typedef for passing around journal access functions */ 456 typedef int (*ocfs2_journal_access_func)(handle_t *handle, 457 struct ocfs2_caching_info *ci, 458 struct buffer_head *bh, int type); 459 460 static inline int ocfs2_should_order_data(struct inode *inode) 461 { 462 if (!S_ISREG(inode->i_mode)) 463 return 0; 464 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 465 return 0; 466 return 1; 467 } 468 469 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 470 { 471 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 472 return 1; 473 return 0; 474 } 475 476 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 477 { 478 /* 479 * Support for sparse files is a pre-requisite 480 */ 481 if (!ocfs2_sparse_alloc(osb)) 482 return 0; 483 484 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 485 return 1; 486 return 0; 487 } 488 489 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 490 { 491 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 492 return 1; 493 return 0; 494 } 495 496 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 497 { 498 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 499 return 1; 500 return 0; 501 } 502 503 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 504 { 505 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 506 return 1; 507 return 0; 508 } 509 510 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 511 { 512 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 513 return 1; 514 return 0; 515 } 516 517 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb) 518 { 519 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG) 520 return 1; 521 return 0; 522 } 523 524 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 525 { 526 if (ocfs2_supports_indexed_dirs(osb)) 527 return OCFS2_DX_LINK_MAX; 528 return OCFS2_LINK_MAX; 529 } 530 531 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 532 { 533 u32 nlink = le16_to_cpu(di->i_links_count); 534 u32 hi = le16_to_cpu(di->i_links_count_hi); 535 536 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 537 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 538 539 return nlink; 540 } 541 542 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 543 { 544 u16 lo, hi; 545 546 lo = nlink; 547 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 548 549 di->i_links_count = cpu_to_le16(lo); 550 di->i_links_count_hi = cpu_to_le16(hi); 551 } 552 553 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 554 { 555 u32 links = ocfs2_read_links_count(di); 556 557 links += n; 558 559 ocfs2_set_links_count(di, links); 560 } 561 562 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb) 563 { 564 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE) 565 return 1; 566 return 0; 567 } 568 569 /* set / clear functions because cluster events can make these happen 570 * in parallel so we want the transitions to be atomic. this also 571 * means that any future flags osb_flags must be protected by spinlock 572 * too! */ 573 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 574 unsigned long flag) 575 { 576 spin_lock(&osb->osb_lock); 577 osb->osb_flags |= flag; 578 spin_unlock(&osb->osb_lock); 579 } 580 581 582 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb, 583 unsigned long flag) 584 { 585 unsigned long ret; 586 587 spin_lock(&osb->osb_lock); 588 ret = osb->osb_flags & flag; 589 spin_unlock(&osb->osb_lock); 590 return ret; 591 } 592 593 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 594 int hard) 595 { 596 spin_lock(&osb->osb_lock); 597 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 598 if (hard) 599 osb->osb_flags |= OCFS2_OSB_HARD_RO; 600 else 601 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 602 spin_unlock(&osb->osb_lock); 603 } 604 605 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 606 { 607 int ret; 608 609 spin_lock(&osb->osb_lock); 610 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 611 spin_unlock(&osb->osb_lock); 612 613 return ret; 614 } 615 616 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 617 { 618 int ret; 619 620 spin_lock(&osb->osb_lock); 621 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 622 spin_unlock(&osb->osb_lock); 623 624 return ret; 625 } 626 627 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb) 628 { 629 return (osb->s_feature_incompat & 630 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK | 631 OCFS2_FEATURE_INCOMPAT_CLUSTERINFO)); 632 } 633 634 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) 635 { 636 if (ocfs2_clusterinfo_valid(osb) && 637 memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK, 638 OCFS2_STACK_LABEL_LEN)) 639 return 1; 640 return 0; 641 } 642 643 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb) 644 { 645 if (ocfs2_clusterinfo_valid(osb) && 646 !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK, 647 OCFS2_STACK_LABEL_LEN)) 648 return 1; 649 return 0; 650 } 651 652 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb) 653 { 654 return ocfs2_o2cb_stack(osb) && 655 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT); 656 } 657 658 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 659 { 660 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 661 } 662 663 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 664 { 665 return (osb->s_feature_incompat & 666 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 667 } 668 669 670 #define OCFS2_IS_VALID_DINODE(ptr) \ 671 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 672 673 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 674 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 675 676 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 677 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 678 679 680 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 681 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 682 683 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 684 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 685 686 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 687 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 688 689 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 690 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 691 692 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \ 693 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE)) 694 695 static inline unsigned long ino_from_blkno(struct super_block *sb, 696 u64 blkno) 697 { 698 return (unsigned long)(blkno & (u64)ULONG_MAX); 699 } 700 701 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 702 u32 clusters) 703 { 704 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 705 sb->s_blocksize_bits; 706 707 return (u64)clusters << c_to_b_bits; 708 } 709 710 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 711 u64 blocks) 712 { 713 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 714 sb->s_blocksize_bits; 715 716 return (u32)(blocks >> b_to_c_bits); 717 } 718 719 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 720 u64 bytes) 721 { 722 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 723 unsigned int clusters; 724 725 bytes += OCFS2_SB(sb)->s_clustersize - 1; 726 /* OCFS2 just cannot have enough clusters to overflow this */ 727 clusters = (unsigned int)(bytes >> cl_bits); 728 729 return clusters; 730 } 731 732 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 733 u64 bytes) 734 { 735 bytes += sb->s_blocksize - 1; 736 return bytes >> sb->s_blocksize_bits; 737 } 738 739 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 740 u32 clusters) 741 { 742 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 743 } 744 745 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 746 u64 blocks) 747 { 748 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 749 unsigned int clusters; 750 751 clusters = ocfs2_blocks_to_clusters(sb, blocks); 752 return (u64)clusters << bits; 753 } 754 755 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 756 u64 bytes) 757 { 758 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 759 unsigned int clusters; 760 761 clusters = ocfs2_clusters_for_bytes(sb, bytes); 762 return (u64)clusters << cl_bits; 763 } 764 765 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 766 u64 bytes) 767 { 768 u64 blocks; 769 770 blocks = ocfs2_blocks_for_bytes(sb, bytes); 771 return blocks << sb->s_blocksize_bits; 772 } 773 774 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 775 { 776 return (unsigned long)((bytes + 511) >> 9); 777 } 778 779 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 780 unsigned long pg_index) 781 { 782 u32 clusters = pg_index; 783 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 784 785 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 786 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 787 else if (PAGE_CACHE_SHIFT < cbits) 788 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 789 790 return clusters; 791 } 792 793 /* 794 * Find the 1st page index which covers the given clusters. 795 */ 796 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 797 u32 clusters) 798 { 799 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 800 pgoff_t index = clusters; 801 802 if (PAGE_CACHE_SHIFT > cbits) { 803 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 804 } else if (PAGE_CACHE_SHIFT < cbits) { 805 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 806 } 807 808 return index; 809 } 810 811 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 812 { 813 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 814 unsigned int pages_per_cluster = 1; 815 816 if (PAGE_CACHE_SHIFT < cbits) 817 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 818 819 return pages_per_cluster; 820 } 821 822 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 823 unsigned int megs) 824 { 825 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 826 827 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 828 } 829 830 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb, 831 unsigned int clusters) 832 { 833 return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits); 834 } 835 836 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap) 837 { 838 __set_bit_le(bit, bitmap); 839 } 840 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr)) 841 842 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap) 843 { 844 __clear_bit_le(bit, bitmap); 845 } 846 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr)) 847 848 #define ocfs2_test_bit test_bit_le 849 #define ocfs2_find_next_zero_bit find_next_zero_bit_le 850 #define ocfs2_find_next_bit find_next_bit_le 851 852 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr) 853 { 854 #if BITS_PER_LONG == 64 855 *bit += ((unsigned long) addr & 7UL) << 3; 856 addr = (void *) ((unsigned long) addr & ~7UL); 857 #elif BITS_PER_LONG == 32 858 *bit += ((unsigned long) addr & 3UL) << 3; 859 addr = (void *) ((unsigned long) addr & ~3UL); 860 #else 861 #error "how many bits you are?!" 862 #endif 863 return addr; 864 } 865 866 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap) 867 { 868 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 869 ocfs2_set_bit(bit, bitmap); 870 } 871 872 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap) 873 { 874 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 875 ocfs2_clear_bit(bit, bitmap); 876 } 877 878 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap) 879 { 880 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 881 return ocfs2_test_bit(bit, bitmap); 882 } 883 884 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max, 885 int start) 886 { 887 int fix = 0, ret, tmpmax; 888 bitmap = correct_addr_and_bit_unaligned(&fix, bitmap); 889 tmpmax = max + fix; 890 start += fix; 891 892 ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix; 893 if (ret > max) 894 return max; 895 return ret; 896 } 897 898 #endif /* OCFS2_H */ 899 900