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 atomic_t needs_checkpoint; 351 struct ocfs2_journal *journal; 352 unsigned long osb_commit_interval; 353 354 struct delayed_work la_enable_wq; 355 356 /* 357 * Must hold local alloc i_mutex and osb->osb_lock to change 358 * local_alloc_bits. Reads can be done under either lock. 359 */ 360 unsigned int local_alloc_bits; 361 unsigned int local_alloc_default_bits; 362 /* osb_clusters_at_boot can become stale! Do not trust it to 363 * be up to date. */ 364 unsigned int osb_clusters_at_boot; 365 366 enum ocfs2_local_alloc_state local_alloc_state; /* protected 367 * by osb_lock */ 368 369 struct buffer_head *local_alloc_bh; 370 371 u64 la_last_gd; 372 373 struct ocfs2_reservation_map osb_la_resmap; 374 375 unsigned int osb_resv_level; 376 unsigned int osb_dir_resv_level; 377 378 /* Next three fields are for local node slot recovery during 379 * mount. */ 380 int dirty; 381 struct ocfs2_dinode *local_alloc_copy; 382 struct ocfs2_quota_recovery *quota_rec; 383 384 struct ocfs2_blockcheck_stats osb_ecc_stats; 385 struct ocfs2_alloc_stats alloc_stats; 386 char dev_str[20]; /* "major,minor" of the device */ 387 388 u8 osb_stackflags; 389 390 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 391 struct ocfs2_cluster_connection *cconn; 392 struct ocfs2_lock_res osb_super_lockres; 393 struct ocfs2_lock_res osb_rename_lockres; 394 struct ocfs2_lock_res osb_nfs_sync_lockres; 395 struct ocfs2_dlm_debug *osb_dlm_debug; 396 397 struct dentry *osb_debug_root; 398 struct dentry *osb_ctxt; 399 400 wait_queue_head_t recovery_event; 401 402 spinlock_t dc_task_lock; 403 struct task_struct *dc_task; 404 wait_queue_head_t dc_event; 405 unsigned long dc_wake_sequence; 406 unsigned long dc_work_sequence; 407 408 /* 409 * Any thread can add locks to the list, but the downconvert 410 * thread is the only one allowed to remove locks. Any change 411 * to this rule requires updating 412 * ocfs2_downconvert_thread_do_work(). 413 */ 414 struct list_head blocked_lock_list; 415 unsigned long blocked_lock_count; 416 417 /* List of dentry locks to release. Anyone can add locks to 418 * the list, ocfs2_wq processes the list */ 419 struct ocfs2_dentry_lock *dentry_lock_list; 420 struct work_struct dentry_lock_work; 421 422 wait_queue_head_t osb_mount_event; 423 424 /* Truncate log info */ 425 struct inode *osb_tl_inode; 426 struct buffer_head *osb_tl_bh; 427 struct delayed_work osb_truncate_log_wq; 428 /* 429 * How many clusters in our truncate log. 430 * It must be protected by osb_tl_inode->i_mutex. 431 */ 432 unsigned int truncated_clusters; 433 434 struct ocfs2_node_map osb_recovering_orphan_dirs; 435 unsigned int *osb_orphan_wipes; 436 wait_queue_head_t osb_wipe_event; 437 438 struct ocfs2_orphan_scan osb_orphan_scan; 439 440 /* used to protect metaecc calculation check of xattr. */ 441 spinlock_t osb_xattr_lock; 442 443 unsigned int osb_dx_mask; 444 u32 osb_dx_seed[4]; 445 446 /* the group we used to allocate inodes. */ 447 u64 osb_inode_alloc_group; 448 449 /* rb tree root for refcount lock. */ 450 struct rb_root osb_rf_lock_tree; 451 struct ocfs2_refcount_tree *osb_ref_tree_lru; 452 }; 453 454 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 455 456 /* Useful typedef for passing around journal access functions */ 457 typedef int (*ocfs2_journal_access_func)(handle_t *handle, 458 struct ocfs2_caching_info *ci, 459 struct buffer_head *bh, int type); 460 461 static inline int ocfs2_should_order_data(struct inode *inode) 462 { 463 if (!S_ISREG(inode->i_mode)) 464 return 0; 465 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 466 return 0; 467 return 1; 468 } 469 470 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 471 { 472 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 473 return 1; 474 return 0; 475 } 476 477 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 478 { 479 /* 480 * Support for sparse files is a pre-requisite 481 */ 482 if (!ocfs2_sparse_alloc(osb)) 483 return 0; 484 485 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 486 return 1; 487 return 0; 488 } 489 490 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 491 { 492 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 493 return 1; 494 return 0; 495 } 496 497 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 498 { 499 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 500 return 1; 501 return 0; 502 } 503 504 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 505 { 506 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 507 return 1; 508 return 0; 509 } 510 511 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 512 { 513 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 514 return 1; 515 return 0; 516 } 517 518 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb) 519 { 520 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG) 521 return 1; 522 return 0; 523 } 524 525 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 526 { 527 if (ocfs2_supports_indexed_dirs(osb)) 528 return OCFS2_DX_LINK_MAX; 529 return OCFS2_LINK_MAX; 530 } 531 532 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 533 { 534 u32 nlink = le16_to_cpu(di->i_links_count); 535 u32 hi = le16_to_cpu(di->i_links_count_hi); 536 537 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 538 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 539 540 return nlink; 541 } 542 543 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 544 { 545 u16 lo, hi; 546 547 lo = nlink; 548 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 549 550 di->i_links_count = cpu_to_le16(lo); 551 di->i_links_count_hi = cpu_to_le16(hi); 552 } 553 554 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 555 { 556 u32 links = ocfs2_read_links_count(di); 557 558 links += n; 559 560 ocfs2_set_links_count(di, links); 561 } 562 563 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb) 564 { 565 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE) 566 return 1; 567 return 0; 568 } 569 570 /* set / clear functions because cluster events can make these happen 571 * in parallel so we want the transitions to be atomic. this also 572 * means that any future flags osb_flags must be protected by spinlock 573 * too! */ 574 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 575 unsigned long flag) 576 { 577 spin_lock(&osb->osb_lock); 578 osb->osb_flags |= flag; 579 spin_unlock(&osb->osb_lock); 580 } 581 582 583 static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb, 584 unsigned long flag) 585 { 586 unsigned long ret; 587 588 spin_lock(&osb->osb_lock); 589 ret = osb->osb_flags & flag; 590 spin_unlock(&osb->osb_lock); 591 return ret; 592 } 593 594 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 595 int hard) 596 { 597 spin_lock(&osb->osb_lock); 598 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 599 if (hard) 600 osb->osb_flags |= OCFS2_OSB_HARD_RO; 601 else 602 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 603 spin_unlock(&osb->osb_lock); 604 } 605 606 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 607 { 608 int ret; 609 610 spin_lock(&osb->osb_lock); 611 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 612 spin_unlock(&osb->osb_lock); 613 614 return ret; 615 } 616 617 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 618 { 619 int ret; 620 621 spin_lock(&osb->osb_lock); 622 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 623 spin_unlock(&osb->osb_lock); 624 625 return ret; 626 } 627 628 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb) 629 { 630 return (osb->s_feature_incompat & 631 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK | 632 OCFS2_FEATURE_INCOMPAT_CLUSTERINFO)); 633 } 634 635 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb) 636 { 637 if (ocfs2_clusterinfo_valid(osb) && 638 memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK, 639 OCFS2_STACK_LABEL_LEN)) 640 return 1; 641 return 0; 642 } 643 644 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb) 645 { 646 if (ocfs2_clusterinfo_valid(osb) && 647 !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK, 648 OCFS2_STACK_LABEL_LEN)) 649 return 1; 650 return 0; 651 } 652 653 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb) 654 { 655 return ocfs2_o2cb_stack(osb) && 656 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT); 657 } 658 659 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 660 { 661 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 662 } 663 664 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 665 { 666 return (osb->s_feature_incompat & 667 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 668 } 669 670 671 #define OCFS2_IS_VALID_DINODE(ptr) \ 672 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 673 674 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 675 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 676 677 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 678 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 679 680 681 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 682 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 683 684 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 685 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 686 687 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 688 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 689 690 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 691 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 692 693 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \ 694 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE)) 695 696 static inline unsigned long ino_from_blkno(struct super_block *sb, 697 u64 blkno) 698 { 699 return (unsigned long)(blkno & (u64)ULONG_MAX); 700 } 701 702 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 703 u32 clusters) 704 { 705 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 706 sb->s_blocksize_bits; 707 708 return (u64)clusters << c_to_b_bits; 709 } 710 711 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 712 u64 blocks) 713 { 714 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 715 sb->s_blocksize_bits; 716 717 return (u32)(blocks >> b_to_c_bits); 718 } 719 720 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 721 u64 bytes) 722 { 723 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 724 unsigned int clusters; 725 726 bytes += OCFS2_SB(sb)->s_clustersize - 1; 727 /* OCFS2 just cannot have enough clusters to overflow this */ 728 clusters = (unsigned int)(bytes >> cl_bits); 729 730 return clusters; 731 } 732 733 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 734 u64 bytes) 735 { 736 bytes += sb->s_blocksize - 1; 737 return bytes >> sb->s_blocksize_bits; 738 } 739 740 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 741 u32 clusters) 742 { 743 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 744 } 745 746 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 747 u64 blocks) 748 { 749 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 750 unsigned int clusters; 751 752 clusters = ocfs2_blocks_to_clusters(sb, blocks); 753 return (u64)clusters << bits; 754 } 755 756 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 757 u64 bytes) 758 { 759 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 760 unsigned int clusters; 761 762 clusters = ocfs2_clusters_for_bytes(sb, bytes); 763 return (u64)clusters << cl_bits; 764 } 765 766 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 767 u64 bytes) 768 { 769 u64 blocks; 770 771 blocks = ocfs2_blocks_for_bytes(sb, bytes); 772 return blocks << sb->s_blocksize_bits; 773 } 774 775 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 776 { 777 return (unsigned long)((bytes + 511) >> 9); 778 } 779 780 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 781 unsigned long pg_index) 782 { 783 u32 clusters = pg_index; 784 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 785 786 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 787 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 788 else if (PAGE_CACHE_SHIFT < cbits) 789 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 790 791 return clusters; 792 } 793 794 /* 795 * Find the 1st page index which covers the given clusters. 796 */ 797 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 798 u32 clusters) 799 { 800 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 801 pgoff_t index = clusters; 802 803 if (PAGE_CACHE_SHIFT > cbits) { 804 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 805 } else if (PAGE_CACHE_SHIFT < cbits) { 806 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 807 } 808 809 return index; 810 } 811 812 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 813 { 814 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 815 unsigned int pages_per_cluster = 1; 816 817 if (PAGE_CACHE_SHIFT < cbits) 818 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 819 820 return pages_per_cluster; 821 } 822 823 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 824 unsigned int megs) 825 { 826 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 827 828 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 829 } 830 831 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb, 832 unsigned int clusters) 833 { 834 return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits); 835 } 836 837 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap) 838 { 839 __set_bit_le(bit, bitmap); 840 } 841 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr)) 842 843 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap) 844 { 845 __clear_bit_le(bit, bitmap); 846 } 847 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr)) 848 849 #define ocfs2_test_bit test_bit_le 850 #define ocfs2_find_next_zero_bit find_next_zero_bit_le 851 #define ocfs2_find_next_bit find_next_bit_le 852 853 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr) 854 { 855 #if BITS_PER_LONG == 64 856 *bit += ((unsigned long) addr & 7UL) << 3; 857 addr = (void *) ((unsigned long) addr & ~7UL); 858 #elif BITS_PER_LONG == 32 859 *bit += ((unsigned long) addr & 3UL) << 3; 860 addr = (void *) ((unsigned long) addr & ~3UL); 861 #else 862 #error "how many bits you are?!" 863 #endif 864 return addr; 865 } 866 867 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap) 868 { 869 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 870 ocfs2_set_bit(bit, bitmap); 871 } 872 873 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap) 874 { 875 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 876 ocfs2_clear_bit(bit, bitmap); 877 } 878 879 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap) 880 { 881 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 882 return ocfs2_test_bit(bit, bitmap); 883 } 884 885 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max, 886 int start) 887 { 888 int fix = 0, ret, tmpmax; 889 bitmap = correct_addr_and_bit_unaligned(&fix, bitmap); 890 tmpmax = max + fix; 891 start += fix; 892 893 ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix; 894 if (ret > max) 895 return max; 896 return ret; 897 } 898 899 #endif /* OCFS2_H */ 900 901