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 struct list_head l_holders; 176 177 unsigned long l_flags; 178 char l_name[OCFS2_LOCK_ID_MAX_LEN]; 179 unsigned int l_ro_holders; 180 unsigned int l_ex_holders; 181 signed char l_level; 182 signed char l_requested; 183 signed char l_blocking; 184 185 /* Data packed - type enum ocfs2_lock_type */ 186 unsigned char l_type; 187 188 /* used from AST/BAST funcs. */ 189 /* Data packed - enum type ocfs2_ast_action */ 190 unsigned char l_action; 191 /* Data packed - enum type ocfs2_unlock_action */ 192 unsigned char l_unlock_action; 193 unsigned int l_pending_gen; 194 195 spinlock_t l_lock; 196 197 struct ocfs2_dlm_lksb l_lksb; 198 199 wait_queue_head_t l_event; 200 201 struct list_head l_debug_list; 202 203 #ifdef CONFIG_OCFS2_FS_STATS 204 struct ocfs2_lock_stats l_lock_prmode; /* PR mode stats */ 205 u32 l_lock_refresh; /* Disk refreshes */ 206 struct ocfs2_lock_stats l_lock_exmode; /* EX mode stats */ 207 #endif 208 #ifdef CONFIG_DEBUG_LOCK_ALLOC 209 struct lockdep_map l_lockdep_map; 210 #endif 211 }; 212 213 enum ocfs2_orphan_reco_type { 214 ORPHAN_NO_NEED_TRUNCATE = 0, 215 ORPHAN_NEED_TRUNCATE, 216 }; 217 218 enum ocfs2_orphan_scan_state { 219 ORPHAN_SCAN_ACTIVE, 220 ORPHAN_SCAN_INACTIVE 221 }; 222 223 struct ocfs2_orphan_scan { 224 struct mutex os_lock; 225 struct ocfs2_super *os_osb; 226 struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */ 227 struct delayed_work os_orphan_scan_work; 228 time64_t os_scantime; /* time this node ran the scan */ 229 u32 os_count; /* tracks node specific scans */ 230 u32 os_seqno; /* tracks cluster wide scans */ 231 atomic_t os_state; /* ACTIVE or INACTIVE */ 232 }; 233 234 struct ocfs2_dlm_debug { 235 struct kref d_refcnt; 236 struct dentry *d_locking_state; 237 struct list_head d_lockres_tracking; 238 }; 239 240 enum ocfs2_vol_state 241 { 242 VOLUME_INIT = 0, 243 VOLUME_MOUNTED, 244 VOLUME_MOUNTED_QUOTAS, 245 VOLUME_DISMOUNTED, 246 VOLUME_DISABLED 247 }; 248 249 struct ocfs2_alloc_stats 250 { 251 atomic_t moves; 252 atomic_t local_data; 253 atomic_t bitmap_data; 254 atomic_t bg_allocs; 255 atomic_t bg_extends; 256 }; 257 258 enum ocfs2_local_alloc_state 259 { 260 OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for 261 * this mountpoint. */ 262 OCFS2_LA_ENABLED, /* Local alloc is in use. */ 263 OCFS2_LA_THROTTLED, /* Local alloc is in use, but number 264 * of bits has been reduced. */ 265 OCFS2_LA_DISABLED /* Local alloc has temporarily been 266 * disabled. */ 267 }; 268 269 enum ocfs2_mount_options 270 { 271 OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */ 272 OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */ 273 OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */ 274 OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */ 275 OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */ 276 OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */ 277 OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */ 278 OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */ 279 OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */ 280 OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9, /* Disable POSIX access 281 control lists */ 282 OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */ 283 OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */ 284 OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT 285 writes */ 286 OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */ 287 OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */ 288 289 OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15, /* Journal Async Commit */ 290 OCFS2_MOUNT_ERRORS_CONT = 1 << 16, /* Return EIO to the calling process on error */ 291 OCFS2_MOUNT_ERRORS_ROFS = 1 << 17, /* Change filesystem to read-only on error */ 292 }; 293 294 #define OCFS2_OSB_SOFT_RO 0x0001 295 #define OCFS2_OSB_HARD_RO 0x0002 296 #define OCFS2_OSB_ERROR_FS 0x0004 297 #define OCFS2_DEFAULT_ATIME_QUANTUM 60 298 299 struct ocfs2_journal; 300 struct ocfs2_slot_info; 301 struct ocfs2_recovery_map; 302 struct ocfs2_replay_map; 303 struct ocfs2_quota_recovery; 304 struct ocfs2_super 305 { 306 struct task_struct *commit_task; 307 struct super_block *sb; 308 struct inode *root_inode; 309 struct inode *sys_root_inode; 310 struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES]; 311 struct inode **local_system_inodes; 312 313 struct ocfs2_slot_info *slot_info; 314 315 u32 *slot_recovery_generations; 316 317 spinlock_t node_map_lock; 318 319 u64 root_blkno; 320 u64 system_dir_blkno; 321 u64 bitmap_blkno; 322 u32 bitmap_cpg; 323 char *uuid_str; 324 u32 uuid_hash; 325 u8 *vol_label; 326 u64 first_cluster_group_blkno; 327 u32 fs_generation; 328 329 u32 s_feature_compat; 330 u32 s_feature_incompat; 331 u32 s_feature_ro_compat; 332 333 /* Protects s_next_generation, osb_flags and s_inode_steal_slot. 334 * Could protect more on osb as it's very short lived. 335 */ 336 spinlock_t osb_lock; 337 u32 s_next_generation; 338 unsigned long osb_flags; 339 s16 s_inode_steal_slot; 340 s16 s_meta_steal_slot; 341 atomic_t s_num_inodes_stolen; 342 atomic_t s_num_meta_stolen; 343 344 unsigned long s_mount_opt; 345 unsigned int s_atime_quantum; 346 347 unsigned int max_slots; 348 unsigned int node_num; 349 int slot_num; 350 int preferred_slot; 351 int s_sectsize_bits; 352 int s_clustersize; 353 int s_clustersize_bits; 354 unsigned int s_xattr_inline_size; 355 356 atomic_t vol_state; 357 struct mutex recovery_lock; 358 struct ocfs2_recovery_map *recovery_map; 359 struct ocfs2_replay_map *replay_map; 360 struct task_struct *recovery_thread_task; 361 int disable_recovery; 362 wait_queue_head_t checkpoint_event; 363 struct ocfs2_journal *journal; 364 unsigned long osb_commit_interval; 365 366 struct delayed_work la_enable_wq; 367 368 /* 369 * Must hold local alloc i_mutex and osb->osb_lock to change 370 * local_alloc_bits. Reads can be done under either lock. 371 */ 372 unsigned int local_alloc_bits; 373 unsigned int local_alloc_default_bits; 374 /* osb_clusters_at_boot can become stale! Do not trust it to 375 * be up to date. */ 376 unsigned int osb_clusters_at_boot; 377 378 enum ocfs2_local_alloc_state local_alloc_state; /* protected 379 * by osb_lock */ 380 381 struct buffer_head *local_alloc_bh; 382 383 u64 la_last_gd; 384 385 struct ocfs2_reservation_map osb_la_resmap; 386 387 unsigned int osb_resv_level; 388 unsigned int osb_dir_resv_level; 389 390 /* Next two fields are for local node slot recovery during 391 * mount. */ 392 struct ocfs2_dinode *local_alloc_copy; 393 struct ocfs2_quota_recovery *quota_rec; 394 395 struct ocfs2_blockcheck_stats osb_ecc_stats; 396 struct ocfs2_alloc_stats alloc_stats; 397 char dev_str[20]; /* "major,minor" of the device */ 398 399 u8 osb_stackflags; 400 401 char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1]; 402 char osb_cluster_name[OCFS2_CLUSTER_NAME_LEN + 1]; 403 struct ocfs2_cluster_connection *cconn; 404 struct ocfs2_lock_res osb_super_lockres; 405 struct ocfs2_lock_res osb_rename_lockres; 406 struct ocfs2_lock_res osb_nfs_sync_lockres; 407 struct ocfs2_dlm_debug *osb_dlm_debug; 408 409 struct dentry *osb_debug_root; 410 struct dentry *osb_ctxt; 411 412 wait_queue_head_t recovery_event; 413 414 spinlock_t dc_task_lock; 415 struct task_struct *dc_task; 416 wait_queue_head_t dc_event; 417 unsigned long dc_wake_sequence; 418 unsigned long dc_work_sequence; 419 420 /* 421 * Any thread can add locks to the list, but the downconvert 422 * thread is the only one allowed to remove locks. Any change 423 * to this rule requires updating 424 * ocfs2_downconvert_thread_do_work(). 425 */ 426 struct list_head blocked_lock_list; 427 unsigned long blocked_lock_count; 428 429 /* List of dquot structures to drop last reference to */ 430 struct llist_head dquot_drop_list; 431 struct work_struct dquot_drop_work; 432 433 wait_queue_head_t osb_mount_event; 434 435 /* Truncate log info */ 436 struct inode *osb_tl_inode; 437 struct buffer_head *osb_tl_bh; 438 struct delayed_work osb_truncate_log_wq; 439 atomic_t osb_tl_disable; 440 /* 441 * How many clusters in our truncate log. 442 * It must be protected by osb_tl_inode->i_mutex. 443 */ 444 unsigned int truncated_clusters; 445 446 struct ocfs2_node_map osb_recovering_orphan_dirs; 447 unsigned int *osb_orphan_wipes; 448 wait_queue_head_t osb_wipe_event; 449 450 struct ocfs2_orphan_scan osb_orphan_scan; 451 452 /* used to protect metaecc calculation check of xattr. */ 453 spinlock_t osb_xattr_lock; 454 455 unsigned int osb_dx_mask; 456 u32 osb_dx_seed[4]; 457 458 /* the group we used to allocate inodes. */ 459 u64 osb_inode_alloc_group; 460 461 /* rb tree root for refcount lock. */ 462 struct rb_root osb_rf_lock_tree; 463 struct ocfs2_refcount_tree *osb_ref_tree_lru; 464 465 struct mutex system_file_mutex; 466 467 /* 468 * OCFS2 needs to schedule several different types of work which 469 * require cluster locking, disk I/O, recovery waits, etc. Since these 470 * types of work tend to be heavy we avoid using the kernel events 471 * workqueue and schedule on our own. 472 */ 473 struct workqueue_struct *ocfs2_wq; 474 }; 475 476 #define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info) 477 478 /* Useful typedef for passing around journal access functions */ 479 typedef int (*ocfs2_journal_access_func)(handle_t *handle, 480 struct ocfs2_caching_info *ci, 481 struct buffer_head *bh, int type); 482 483 static inline int ocfs2_should_order_data(struct inode *inode) 484 { 485 if (!S_ISREG(inode->i_mode)) 486 return 0; 487 if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) 488 return 0; 489 return 1; 490 } 491 492 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) 493 { 494 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC) 495 return 1; 496 return 0; 497 } 498 499 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) 500 { 501 /* 502 * Support for sparse files is a pre-requisite 503 */ 504 if (!ocfs2_sparse_alloc(osb)) 505 return 0; 506 507 if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) 508 return 1; 509 return 0; 510 } 511 512 static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb) 513 { 514 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_APPEND_DIO) 515 return 1; 516 return 0; 517 } 518 519 520 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) 521 { 522 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) 523 return 1; 524 return 0; 525 } 526 527 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb) 528 { 529 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR) 530 return 1; 531 return 0; 532 } 533 534 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb) 535 { 536 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC) 537 return 1; 538 return 0; 539 } 540 541 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb) 542 { 543 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS) 544 return 1; 545 return 0; 546 } 547 548 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb) 549 { 550 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG) 551 return 1; 552 return 0; 553 } 554 555 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb) 556 { 557 if (ocfs2_supports_indexed_dirs(osb)) 558 return OCFS2_DX_LINK_MAX; 559 return OCFS2_LINK_MAX; 560 } 561 562 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di) 563 { 564 u32 nlink = le16_to_cpu(di->i_links_count); 565 u32 hi = le16_to_cpu(di->i_links_count_hi); 566 567 if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL)) 568 nlink |= (hi << OCFS2_LINKS_HI_SHIFT); 569 570 return nlink; 571 } 572 573 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink) 574 { 575 u16 lo, hi; 576 577 lo = nlink; 578 hi = nlink >> OCFS2_LINKS_HI_SHIFT; 579 580 di->i_links_count = cpu_to_le16(lo); 581 di->i_links_count_hi = cpu_to_le16(hi); 582 } 583 584 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n) 585 { 586 u32 links = ocfs2_read_links_count(di); 587 588 links += n; 589 590 ocfs2_set_links_count(di, links); 591 } 592 593 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb) 594 { 595 if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE) 596 return 1; 597 return 0; 598 } 599 600 /* set / clear functions because cluster events can make these happen 601 * in parallel so we want the transitions to be atomic. this also 602 * means that any future flags osb_flags must be protected by spinlock 603 * too! */ 604 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb, 605 unsigned long flag) 606 { 607 spin_lock(&osb->osb_lock); 608 osb->osb_flags |= flag; 609 spin_unlock(&osb->osb_lock); 610 } 611 612 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb, 613 int hard) 614 { 615 spin_lock(&osb->osb_lock); 616 osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO); 617 if (hard) 618 osb->osb_flags |= OCFS2_OSB_HARD_RO; 619 else 620 osb->osb_flags |= OCFS2_OSB_SOFT_RO; 621 spin_unlock(&osb->osb_lock); 622 } 623 624 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb) 625 { 626 int ret; 627 628 spin_lock(&osb->osb_lock); 629 ret = osb->osb_flags & OCFS2_OSB_HARD_RO; 630 spin_unlock(&osb->osb_lock); 631 632 return ret; 633 } 634 635 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb) 636 { 637 int ret; 638 639 spin_lock(&osb->osb_lock); 640 ret = osb->osb_flags & OCFS2_OSB_SOFT_RO; 641 spin_unlock(&osb->osb_lock); 642 643 return ret; 644 } 645 646 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb) 647 { 648 return (osb->s_feature_incompat & 649 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK | 650 OCFS2_FEATURE_INCOMPAT_CLUSTERINFO)); 651 } 652 653 static inline int ocfs2_userspace_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_o2cb_stack(struct ocfs2_super *osb) 663 { 664 if (ocfs2_clusterinfo_valid(osb) && 665 !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK, 666 OCFS2_STACK_LABEL_LEN)) 667 return 1; 668 return 0; 669 } 670 671 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb) 672 { 673 return ocfs2_o2cb_stack(osb) && 674 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT); 675 } 676 677 static inline int ocfs2_mount_local(struct ocfs2_super *osb) 678 { 679 return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT); 680 } 681 682 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb) 683 { 684 return (osb->s_feature_incompat & 685 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP); 686 } 687 688 689 #define OCFS2_IS_VALID_DINODE(ptr) \ 690 (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE)) 691 692 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \ 693 (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE)) 694 695 #define OCFS2_IS_VALID_GROUP_DESC(ptr) \ 696 (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE)) 697 698 699 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \ 700 (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE)) 701 702 #define OCFS2_IS_VALID_DIR_TRAILER(ptr) \ 703 (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE)) 704 705 #define OCFS2_IS_VALID_DX_ROOT(ptr) \ 706 (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE)) 707 708 #define OCFS2_IS_VALID_DX_LEAF(ptr) \ 709 (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE)) 710 711 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr) \ 712 (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE)) 713 714 static inline unsigned long ino_from_blkno(struct super_block *sb, 715 u64 blkno) 716 { 717 return (unsigned long)(blkno & (u64)ULONG_MAX); 718 } 719 720 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb, 721 u32 clusters) 722 { 723 int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits - 724 sb->s_blocksize_bits; 725 726 return (u64)clusters << c_to_b_bits; 727 } 728 729 static inline u32 ocfs2_clusters_for_blocks(struct super_block *sb, 730 u64 blocks) 731 { 732 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 733 sb->s_blocksize_bits; 734 735 blocks += (1 << b_to_c_bits) - 1; 736 return (u32)(blocks >> b_to_c_bits); 737 } 738 739 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb, 740 u64 blocks) 741 { 742 int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits - 743 sb->s_blocksize_bits; 744 745 return (u32)(blocks >> b_to_c_bits); 746 } 747 748 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb, 749 u64 bytes) 750 { 751 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 752 unsigned int clusters; 753 754 bytes += OCFS2_SB(sb)->s_clustersize - 1; 755 /* OCFS2 just cannot have enough clusters to overflow this */ 756 clusters = (unsigned int)(bytes >> cl_bits); 757 758 return clusters; 759 } 760 761 static inline unsigned int ocfs2_bytes_to_clusters(struct super_block *sb, 762 u64 bytes) 763 { 764 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 765 unsigned int clusters; 766 767 clusters = (unsigned int)(bytes >> cl_bits); 768 return clusters; 769 } 770 771 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb, 772 u64 bytes) 773 { 774 bytes += sb->s_blocksize - 1; 775 return bytes >> sb->s_blocksize_bits; 776 } 777 778 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb, 779 u32 clusters) 780 { 781 return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits; 782 } 783 784 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb, 785 u64 blocks) 786 { 787 int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits; 788 unsigned int clusters; 789 790 clusters = ocfs2_blocks_to_clusters(sb, blocks); 791 return (u64)clusters << bits; 792 } 793 794 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb, 795 u64 bytes) 796 { 797 int cl_bits = OCFS2_SB(sb)->s_clustersize_bits; 798 unsigned int clusters; 799 800 clusters = ocfs2_clusters_for_bytes(sb, bytes); 801 return (u64)clusters << cl_bits; 802 } 803 804 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb, 805 u64 bytes) 806 { 807 u64 blocks; 808 809 blocks = ocfs2_blocks_for_bytes(sb, bytes); 810 return blocks << sb->s_blocksize_bits; 811 } 812 813 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes) 814 { 815 return (unsigned long)((bytes + 511) >> 9); 816 } 817 818 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb, 819 unsigned long pg_index) 820 { 821 u32 clusters = pg_index; 822 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 823 824 if (unlikely(PAGE_SHIFT > cbits)) 825 clusters = pg_index << (PAGE_SHIFT - cbits); 826 else if (PAGE_SHIFT < cbits) 827 clusters = pg_index >> (cbits - PAGE_SHIFT); 828 829 return clusters; 830 } 831 832 /* 833 * Find the 1st page index which covers the given clusters. 834 */ 835 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb, 836 u32 clusters) 837 { 838 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 839 pgoff_t index = clusters; 840 841 if (PAGE_SHIFT > cbits) { 842 index = (pgoff_t)clusters >> (PAGE_SHIFT - cbits); 843 } else if (PAGE_SHIFT < cbits) { 844 index = (pgoff_t)clusters << (cbits - PAGE_SHIFT); 845 } 846 847 return index; 848 } 849 850 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb) 851 { 852 unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits; 853 unsigned int pages_per_cluster = 1; 854 855 if (PAGE_SHIFT < cbits) 856 pages_per_cluster = 1 << (cbits - PAGE_SHIFT); 857 858 return pages_per_cluster; 859 } 860 861 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb, 862 unsigned int megs) 863 { 864 BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576); 865 866 return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits); 867 } 868 869 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb, 870 unsigned int clusters) 871 { 872 return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits); 873 } 874 875 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap) 876 { 877 __set_bit_le(bit, bitmap); 878 } 879 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr)) 880 881 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap) 882 { 883 __clear_bit_le(bit, bitmap); 884 } 885 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr)) 886 887 #define ocfs2_test_bit test_bit_le 888 #define ocfs2_find_next_zero_bit find_next_zero_bit_le 889 #define ocfs2_find_next_bit find_next_bit_le 890 891 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr) 892 { 893 #if BITS_PER_LONG == 64 894 *bit += ((unsigned long) addr & 7UL) << 3; 895 addr = (void *) ((unsigned long) addr & ~7UL); 896 #elif BITS_PER_LONG == 32 897 *bit += ((unsigned long) addr & 3UL) << 3; 898 addr = (void *) ((unsigned long) addr & ~3UL); 899 #else 900 #error "how many bits you are?!" 901 #endif 902 return addr; 903 } 904 905 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap) 906 { 907 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 908 ocfs2_set_bit(bit, bitmap); 909 } 910 911 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap) 912 { 913 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 914 ocfs2_clear_bit(bit, bitmap); 915 } 916 917 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap) 918 { 919 bitmap = correct_addr_and_bit_unaligned(&bit, bitmap); 920 return ocfs2_test_bit(bit, bitmap); 921 } 922 923 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max, 924 int start) 925 { 926 int fix = 0, ret, tmpmax; 927 bitmap = correct_addr_and_bit_unaligned(&fix, bitmap); 928 tmpmax = max + fix; 929 start += fix; 930 931 ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix; 932 if (ret > max) 933 return max; 934 return ret; 935 } 936 937 #endif /* OCFS2_H */ 938 939