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/llist.h> 34 #include <linux/rbtree.h> 35 #include <linux/workqueue.h> 36 #include <linux/kref.h> 37 #include <linux/mutex.h> 38 #include <linux/lockdep.h> 39 #include <linux/jbd2.h> 40 41 /* For union ocfs2_dlm_lksb */ 42 #include "stackglue.h" 43 44 #include "ocfs2_fs.h" 45 #include "ocfs2_lockid.h" 46 #include "ocfs2_ioctl.h" 47 48 /* For struct ocfs2_blockcheck_stats */ 49 #include "blockcheck.h" 50 51 #include "reservations.h" 52 53 /* Caching of metadata buffers */ 54 55 /* Most user visible OCFS2 inodes will have very few pieces of 56 * metadata, but larger files (including bitmaps, etc) must be taken 57 * into account when designing an access scheme. We allow a small 58 * amount of inlined blocks to be stored on an array and grow the 59 * structure into a rb tree when necessary. */ 60 #define OCFS2_CACHE_INFO_MAX_ARRAY 2 61 62 /* Flags for ocfs2_caching_info */ 63 64 enum ocfs2_caching_info_flags { 65 /* Indicates that the metadata cache is using the inline array */ 66 OCFS2_CACHE_FL_INLINE = 1<<1, 67 }; 68 69 struct ocfs2_caching_operations; 70 struct ocfs2_caching_info { 71 /* 72 * The parent structure provides the locks, but because the 73 * parent structure can differ, it provides locking operations 74 * to struct ocfs2_caching_info. 75 */ 76 const struct ocfs2_caching_operations *ci_ops; 77 78 /* next two are protected by trans_inc_lock */ 79 /* which transaction were we created on? Zero if none. */ 80 unsigned long ci_created_trans; 81 /* last transaction we were a part of. */ 82 unsigned long ci_last_trans; 83 84 /* Cache structures */ 85 unsigned int ci_flags; 86 unsigned int ci_num_cached; 87 union { 88 sector_t ci_array[OCFS2_CACHE_INFO_MAX_ARRAY]; 89 struct rb_root ci_tree; 90 } ci_cache; 91 }; 92 /* 93 * Need this prototype here instead of in uptodate.h because journal.h 94 * uses it. 95 */ 96 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci); 97 98 /* this limits us to 256 nodes 99 * if we need more, we can do a kmalloc for the map */ 100 #define OCFS2_NODE_MAP_MAX_NODES 256 101 struct ocfs2_node_map { 102 u16 num_nodes; 103 unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)]; 104 }; 105 106 enum ocfs2_ast_action { 107 OCFS2_AST_INVALID = 0, 108 OCFS2_AST_ATTACH, 109 OCFS2_AST_CONVERT, 110 OCFS2_AST_DOWNCONVERT, 111 }; 112 113 /* actions for an unlockast function to take. */ 114 enum ocfs2_unlock_action { 115 OCFS2_UNLOCK_INVALID = 0, 116 OCFS2_UNLOCK_CANCEL_CONVERT, 117 OCFS2_UNLOCK_DROP_LOCK, 118 }; 119 120 /* ocfs2_lock_res->l_flags flags. */ 121 #define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized 122 * the lvb */ 123 #define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in 124 * dlm_lock */ 125 #define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to 126 * downconvert*/ 127 #define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */ 128 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010) 129 #define OCFS2_LOCK_REFRESHING (0x00000020) 130 #define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization 131 * for shutdown paths */ 132 #define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track 133 * when to skip queueing 134 * a lock because it's 135 * about to be 136 * dropped. */ 137 #define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */ 138 #define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */ 139 #define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a 140 call to dlm_lock. Only 141 exists with BUSY set. */ 142 #define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread 143 * from downconverting 144 * before the upconvert 145 * has completed */ 146 147 #define OCFS2_LOCK_NONBLOCK_FINISHED (0x00001000) /* NONBLOCK cluster 148 * lock has already 149 * returned, do not block 150 * dc thread from 151 * downconverting */ 152 153 struct ocfs2_lock_res_ops; 154 155 typedef void (*ocfs2_lock_callback)(int status, unsigned long data); 156 157 #ifdef CONFIG_OCFS2_FS_STATS 158 struct ocfs2_lock_stats { 159 u64 ls_total; /* Total wait in NSEC */ 160 u32 ls_gets; /* Num acquires */ 161 u32 ls_fail; /* Num failed acquires */ 162 163 /* Storing max wait in usecs saves 24 bytes per inode */ 164 u32 ls_max; /* Max wait in USEC */ 165 }; 166 #endif 167 168 struct ocfs2_lock_res { 169 void *l_priv; 170 struct ocfs2_lock_res_ops *l_ops; 171 172 173 struct list_head l_blocked_list; 174 struct list_head l_mask_waiters; 175 176 unsigned long l_flags; 177 char l_name[OCFS2_LOCK_ID_MAX_LEN]; 178 unsigned int l_ro_holders; 179 unsigned int l_ex_holders; 180 signed char l_level; 181 signed char l_requested; 182 signed char l_blocking; 183 184 /* Data packed - type enum ocfs2_lock_type */ 185 unsigned char l_type; 186 187 /* used from AST/BAST funcs. */ 188 /* Data packed - enum type ocfs2_ast_action */ 189 unsigned char l_action; 190 /* Data packed - enum type ocfs2_unlock_action */ 191 unsigned char l_unlock_action; 192 unsigned int l_pending_gen; 193 194 spinlock_t l_lock; 195 196 struct ocfs2_dlm_lksb l_lksb; 197 198 wait_queue_head_t l_event; 199 200 struct list_head l_debug_list; 201 202 #ifdef CONFIG_OCFS2_FS_STATS 203 struct ocfs2_lock_stats l_lock_prmode; /* PR mode stats */ 204 u32 l_lock_refresh; /* Disk refreshes */ 205 struct ocfs2_lock_stats l_lock_exmode; /* EX mode stats */ 206 #endif 207 #ifdef CONFIG_DEBUG_LOCK_ALLOC 208 struct lockdep_map l_lockdep_map; 209 #endif 210 }; 211 212 enum ocfs2_orphan_reco_type { 213 ORPHAN_NO_NEED_TRUNCATE = 0, 214 ORPHAN_NEED_TRUNCATE, 215 }; 216 217 enum ocfs2_orphan_scan_state { 218 ORPHAN_SCAN_ACTIVE, 219 ORPHAN_SCAN_INACTIVE 220 }; 221 222 struct ocfs2_orphan_scan { 223 struct mutex os_lock; 224 struct ocfs2_super *os_osb; 225 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */ 226 struct delayed_work os_orphan_scan_work; 227 struct timespec os_scantime; /* time this node ran the scan */ 228 u32 os_count; /* tracks node specific scans */ 229 u32 os_seqno; /* tracks cluster wide scans */ 230 atomic_t os_state; /* ACTIVE or INACTIVE */ 231 }; 232 233 struct ocfs2_dlm_debug { 234 struct kref d_refcnt; 235 struct dentry *d_locking_state; 236 struct list_head d_lockres_tracking; 237 }; 238 239 enum ocfs2_vol_state 240 { 241 VOLUME_INIT = 0, 242 VOLUME_MOUNTED, 243 VOLUME_MOUNTED_QUOTAS, 244 VOLUME_DISMOUNTED, 245 VOLUME_DISABLED 246 }; 247 248 struct ocfs2_alloc_stats 249 { 250 atomic_t moves; 251 atomic_t local_data; 252 atomic_t bitmap_data; 253 atomic_t bg_allocs; 254 atomic_t bg_extends; 255 }; 256 257 enum ocfs2_local_alloc_state 258 { 259 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for 260 * this mountpoint. */ 261 OCFS2_LA_ENABLED, /* Local alloc is in use. */ 262 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number 263 * of bits has been reduced. */ 264 OCFS2_LA_DISABLED /* Local alloc has temporarily been 265 * disabled. */ 266 }; 267 268 enum ocfs2_mount_options 269 { 270 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */ 271 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ 272 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ 273 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ 274 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ 275 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */ 276 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */ 277 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */ 278 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */ 279 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access 280 control lists */ 281 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */ 282 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */ 283 OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT 284 writes */ 285 OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */ 286 OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */ 287 288 OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15, /* Journal Async Commit */ 289 }; 290 291 #define OCFS2_OSB_SOFT_RO 0x0001 292 #define OCFS2_OSB_HARD_RO 0x0002 293 #define OCFS2_OSB_ERROR_FS 0x0004 294 #define OCFS2_DEFAULT_ATIME_QUANTUM 60 295 296 struct ocfs2_journal; 297 struct ocfs2_slot_info; 298 struct ocfs2_recovery_map; 299 struct ocfs2_replay_map; 300 struct ocfs2_quota_recovery; 301 struct ocfs2_super 302 { 303 struct task_struct *commit_task; 304 struct super_block *sb; 305 struct inode *root_inode; 306 struct inode *sys_root_inode; 307 struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES]; 308 struct inode **local_system_inodes; 309 310 struct ocfs2_slot_info *slot_info; 311 312 u32 *slot_recovery_generations; 313 314 spinlock_t node_map_lock; 315 316 u64 root_blkno; 317 u64 system_dir_blkno; 318 u64 bitmap_blkno; 319 u32 bitmap_cpg; 320 u8 *uuid; 321 char *uuid_str; 322 u32 uuid_hash; 323 u8 *vol_label; 324 u64 first_cluster_group_blkno; 325 u32 fs_generation; 326 327 u32 s_feature_compat; 328 u32 s_feature_incompat; 329 u32 s_feature_ro_compat; 330 331 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 332 * Could protect more on osb as it's very short lived. 333 */ 334 spinlock_t osb_lock; 335 u32 s_next_generation; 336 unsigned long osb_flags; 337 s16 s_inode_steal_slot; 338 s16 s_meta_steal_slot; 339 atomic_t s_num_inodes_stolen; 340 atomic_t s_num_meta_stolen; 341 342 unsigned long s_mount_opt; 343 unsigned int s_atime_quantum; 344 345 unsigned int max_slots; 346 unsigned int node_num; 347 int slot_num; 348 int preferred_slot; 349 int s_sectsize_bits; 350 int s_clustersize; 351 int s_clustersize_bits; 352 unsigned int s_xattr_inline_size; 353 354 atomic_t vol_state; 355 struct mutex recovery_lock; 356 struct ocfs2_recovery_map *recovery_map; 357 struct ocfs2_replay_map *replay_map; 358 struct task_struct *recovery_thread_task; 359 int disable_recovery; 360 wait_queue_head_t checkpoint_event; 361 struct ocfs2_journal *journal; 362 unsigned long osb_commit_interval; 363 364 struct delayed_work la_enable_wq; 365 366 /* 367 * Must hold local alloc i_mutex and osb->osb_lock to change 368 * local_alloc_bits. Reads can be done under either lock. 369 */ 370 unsigned int local_alloc_bits; 371 unsigned int local_alloc_default_bits; 372 /* osb_clusters_at_boot can become stale! Do not trust it to 373 * be up to date. */ 374 unsigned int osb_clusters_at_boot; 375 376 enum ocfs2_local_alloc_state local_alloc_state; /* protected 377 * by osb_lock */ 378 379 struct buffer_head *local_alloc_bh; 380 381 u64 la_last_gd; 382 383 struct ocfs2_reservation_map osb_la_resmap; 384 385 unsigned int osb_resv_level; 386 unsigned int osb_dir_resv_level; 387 388 /* Next three fields are for local node slot recovery during 389 * mount. */ 390 int dirty; 391 struct ocfs2_dinode *local_alloc_copy; 392 struct ocfs2_quota_recovery *quota_rec; 393 394 struct ocfs2_blockcheck_stats osb_ecc_stats; 395 struct ocfs2_alloc_stats alloc_stats; 396 char dev_str[20]; /* "major,minor" of the device */ 397 398 u8 osb_stackflags; 399 400 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 401 char osb_cluster_name[OCFS2_CLUSTER_NAME_LEN + 1]; 402 struct ocfs2_cluster_connection *cconn; 403 struct ocfs2_lock_res osb_super_lockres; 404 struct ocfs2_lock_res osb_rename_lockres; 405 struct ocfs2_lock_res osb_nfs_sync_lockres; 406 struct ocfs2_dlm_debug *osb_dlm_debug; 407 408 struct dentry *osb_debug_root; 409 struct dentry *osb_ctxt; 410 411 wait_queue_head_t recovery_event; 412 413 spinlock_t dc_task_lock; 414 struct task_struct *dc_task; 415 wait_queue_head_t dc_event; 416 unsigned long dc_wake_sequence; 417 unsigned long dc_work_sequence; 418 419 /* 420 * Any thread can add locks to the list, but the downconvert 421 * thread is the only one allowed to remove locks. Any change 422 * to this rule requires updating 423 * ocfs2_downconvert_thread_do_work(). 424 */ 425 struct list_head blocked_lock_list; 426 unsigned long blocked_lock_count; 427 428 /* List of dquot structures to drop last reference to */ 429 struct llist_head dquot_drop_list; 430 struct work_struct dquot_drop_work; 431 432 wait_queue_head_t osb_mount_event; 433 434 /* Truncate log info */ 435 struct inode *osb_tl_inode; 436 struct buffer_head *osb_tl_bh; 437 struct delayed_work osb_truncate_log_wq; 438 atomic_t osb_tl_disable; 439 /* 440 * How many clusters in our truncate log. 441 * It must be protected by osb_tl_inode->i_mutex. 442 */ 443 unsigned int truncated_clusters; 444 445 struct ocfs2_node_map osb_recovering_orphan_dirs; 446 unsigned int *osb_orphan_wipes; 447 wait_queue_head_t osb_wipe_event; 448 449 struct ocfs2_orphan_scan osb_orphan_scan; 450 451 /* used to protect metaecc calculation check of xattr. */ 452 spinlock_t osb_xattr_lock; 453 454 unsigned int osb_dx_mask; 455 u32 osb_dx_seed[4]; 456 457 /* the group we used to allocate inodes. */ 458 u64 osb_inode_alloc_group; 459 460 /* rb tree root for refcount lock. */ 461 struct rb_root osb_rf_lock_tree; 462 struct ocfs2_refcount_tree *osb_ref_tree_lru; 463 464 struct mutex system_file_mutex; 465 }; 466 467 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 468 469 /* Useful typedef for passing around journal access functions */ 470 typedef int (*ocfs2_journal_access_func)(handle_t *handle, 471 struct ocfs2_caching_info *ci, 472 struct buffer_head *bh, int type); 473 474 static inline int ocfs2_should_order_data(struct inode *inode) 475 { 476 if (!S_ISREG(inode->i_mode)) 477 return 0; 478 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 479 return 0; 480 return 1; 481 } 482 483 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 484 { 485 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 486 return 1; 487 return 0; 488 } 489 490 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 491 { 492 /* 493 * Support for sparse files is a pre-requisite 494 */ 495 if (!ocfs2_sparse_alloc(osb)) 496 return 0; 497 498 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 499 return 1; 500 return 0; 501 } 502 503 static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb) 504 { 505 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_APPEND_DIO) 506 return 1; 507 return 0; 508 } 509 510 511 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 512 { 513 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 514 return 1; 515 return 0; 516 } 517 518 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 519 { 520 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 521 return 1; 522 return 0; 523 } 524 525 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 526 { 527 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 528 return 1; 529 return 0; 530 } 531 532 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 533 { 534 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 535 return 1; 536 return 0; 537 } 538 539 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb) 540 { 541 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG) 542 return 1; 543 return 0; 544 } 545 546 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 547 { 548 if (ocfs2_supports_indexed_dirs(osb)) 549 return OCFS2_DX_LINK_MAX; 550 return OCFS2_LINK_MAX; 551 } 552 553 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 554 { 555 u32 nlink = le16_to_cpu(di->i_links_count); 556 u32 hi = le16_to_cpu(di->i_links_count_hi); 557 558 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 559 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 560 561 return nlink; 562 } 563 564 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 565 { 566 u16 lo, hi; 567 568 lo = nlink; 569 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 570 571 di->i_links_count = cpu_to_le16(lo); 572 di->i_links_count_hi = cpu_to_le16(hi); 573 } 574 575 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 576 { 577 u32 links = ocfs2_read_links_count(di); 578 579 links += n; 580 581 ocfs2_set_links_count(di, links); 582 } 583 584 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb) 585 { 586 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE) 587 return 1; 588 return 0; 589 } 590 591 /* set / clear functions because cluster events can make these happen 592 * in parallel so we want the transitions to be atomic. this also 593 * means that any future flags osb_flags must be protected by spinlock 594 * too! */ 595 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 596 unsigned long flag) 597 { 598 spin_lock(&osb->osb_lock); 599 osb->osb_flags |= flag; 600 spin_unlock(&osb->osb_lock); 601 } 602 603 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 604 int hard) 605 { 606 spin_lock(&osb->osb_lock); 607 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 608 if (hard) 609 osb->osb_flags |= OCFS2_OSB_HARD_RO; 610 else 611 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 612 spin_unlock(&osb->osb_lock); 613 } 614 615 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 616 { 617 int ret; 618 619 spin_lock(&osb->osb_lock); 620 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 621 spin_unlock(&osb->osb_lock); 622 623 return ret; 624 } 625 626 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 627 { 628 int ret; 629 630 spin_lock(&osb->osb_lock); 631 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 632 spin_unlock(&osb->osb_lock); 633 634 return ret; 635 } 636 637 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb) 638 { 639 return (osb->s_feature_incompat & 640 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK | 641 OCFS2_FEATURE_INCOMPAT_CLUSTERINFO)); 642 } 643 644 static inline int ocfs2_userspace_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_o2cb_stack(struct ocfs2_super *osb) 654 { 655 if (ocfs2_clusterinfo_valid(osb) && 656 !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK, 657 OCFS2_STACK_LABEL_LEN)) 658 return 1; 659 return 0; 660 } 661 662 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb) 663 { 664 return ocfs2_o2cb_stack(osb) && 665 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT); 666 } 667 668 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 669 { 670 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 671 } 672 673 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 674 { 675 return (osb->s_feature_incompat & 676 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 677 } 678 679 680 #define OCFS2_IS_VALID_DINODE(ptr) \ 681 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 682 683 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 684 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 685 686 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 687 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 688 689 690 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 691 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 692 693 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 694 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 695 696 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 697 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 698 699 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 700 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 701 702 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \ 703 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE)) 704 705 static inline unsigned long ino_from_blkno(struct super_block *sb, 706 u64 blkno) 707 { 708 return (unsigned long)(blkno & (u64)ULONG_MAX); 709 } 710 711 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 712 u32 clusters) 713 { 714 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 715 sb->s_blocksize_bits; 716 717 return (u64)clusters << c_to_b_bits; 718 } 719 720 static inline u32 ocfs2_clusters_for_blocks(struct super_block *sb, 721 u64 blocks) 722 { 723 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 724 sb->s_blocksize_bits; 725 726 blocks += (1 << b_to_c_bits) - 1; 727 return (u32)(blocks >> b_to_c_bits); 728 } 729 730 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 731 u64 blocks) 732 { 733 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 734 sb->s_blocksize_bits; 735 736 return (u32)(blocks >> b_to_c_bits); 737 } 738 739 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 740 u64 bytes) 741 { 742 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 743 unsigned int clusters; 744 745 bytes += OCFS2_SB(sb)->s_clustersize - 1; 746 /* OCFS2 just cannot have enough clusters to overflow this */ 747 clusters = (unsigned int)(bytes >> cl_bits); 748 749 return clusters; 750 } 751 752 static inline unsigned int ocfs2_bytes_to_clusters(struct super_block *sb, 753 u64 bytes) 754 { 755 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 756 unsigned int clusters; 757 758 clusters = (unsigned int)(bytes >> cl_bits); 759 return clusters; 760 } 761 762 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 763 u64 bytes) 764 { 765 bytes += sb->s_blocksize - 1; 766 return bytes >> sb->s_blocksize_bits; 767 } 768 769 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 770 u32 clusters) 771 { 772 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 773 } 774 775 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 776 u64 blocks) 777 { 778 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 779 unsigned int clusters; 780 781 clusters = ocfs2_blocks_to_clusters(sb, blocks); 782 return (u64)clusters << bits; 783 } 784 785 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 786 u64 bytes) 787 { 788 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 789 unsigned int clusters; 790 791 clusters = ocfs2_clusters_for_bytes(sb, bytes); 792 return (u64)clusters << cl_bits; 793 } 794 795 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 796 u64 bytes) 797 { 798 u64 blocks; 799 800 blocks = ocfs2_blocks_for_bytes(sb, bytes); 801 return blocks << sb->s_blocksize_bits; 802 } 803 804 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 805 { 806 return (unsigned long)((bytes + 511) >> 9); 807 } 808 809 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 810 unsigned long pg_index) 811 { 812 u32 clusters = pg_index; 813 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 814 815 if (unlikely(PAGE_CACHE_SHIFT > cbits)) 816 clusters = pg_index << (PAGE_CACHE_SHIFT - cbits); 817 else if (PAGE_CACHE_SHIFT < cbits) 818 clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT); 819 820 return clusters; 821 } 822 823 /* 824 * Find the 1st page index which covers the given clusters. 825 */ 826 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 827 u32 clusters) 828 { 829 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 830 pgoff_t index = clusters; 831 832 if (PAGE_CACHE_SHIFT > cbits) { 833 index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits); 834 } else if (PAGE_CACHE_SHIFT < cbits) { 835 index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT); 836 } 837 838 return index; 839 } 840 841 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 842 { 843 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 844 unsigned int pages_per_cluster = 1; 845 846 if (PAGE_CACHE_SHIFT < cbits) 847 pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT); 848 849 return pages_per_cluster; 850 } 851 852 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 853 unsigned int megs) 854 { 855 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 856 857 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 858 } 859 860 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb, 861 unsigned int clusters) 862 { 863 return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits); 864 } 865 866 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap) 867 { 868 __set_bit_le(bit, bitmap); 869 } 870 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr)) 871 872 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap) 873 { 874 __clear_bit_le(bit, bitmap); 875 } 876 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr)) 877 878 #define ocfs2_test_bit test_bit_le 879 #define ocfs2_find_next_zero_bit find_next_zero_bit_le 880 #define ocfs2_find_next_bit find_next_bit_le 881 882 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr) 883 { 884 #if BITS_PER_LONG == 64 885 *bit += ((unsigned long) addr & 7UL) << 3; 886 addr = (void *) ((unsigned long) addr & ~7UL); 887 #elif BITS_PER_LONG == 32 888 *bit += ((unsigned long) addr & 3UL) << 3; 889 addr = (void *) ((unsigned long) addr & ~3UL); 890 #else 891 #error "how many bits you are?!" 892 #endif 893 return addr; 894 } 895 896 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap) 897 { 898 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 899 ocfs2_set_bit(bit, bitmap); 900 } 901 902 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap) 903 { 904 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 905 ocfs2_clear_bit(bit, bitmap); 906 } 907 908 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap) 909 { 910 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 911 return ocfs2_test_bit(bit, bitmap); 912 } 913 914 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max, 915 int start) 916 { 917 int fix = 0, ret, tmpmax; 918 bitmap = correct_addr_and_bit_unaligned(&fix, bitmap); 919 tmpmax = max + fix; 920 start += fix; 921 922 ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix; 923 if (ret > max) 924 return max; 925 return ret; 926 } 927 928 #endif /* OCFS2_H */ 929 930