linux/fs/ocfs2/ocfs2.h
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   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
  63enum ocfs2_caching_info_flags {
  64        /* Indicates that the metadata cache is using the inline array */
  65        OCFS2_CACHE_FL_INLINE   = 1<<1,
  66};
  67
  68struct ocfs2_caching_operations;
  69struct 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 */
  95struct 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
 100struct ocfs2_node_map {
 101        u16 num_nodes;
 102        unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
 103};
 104
 105enum 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. */
 113enum 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
 146struct ocfs2_lock_res_ops;
 147
 148typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
 149
 150#ifdef CONFIG_OCFS2_FS_STATS
 151struct 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
 161struct 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
 205enum ocfs2_orphan_scan_state {
 206        ORPHAN_SCAN_ACTIVE,
 207        ORPHAN_SCAN_INACTIVE
 208};
 209
 210struct 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
 221struct ocfs2_dlm_debug {
 222        struct kref d_refcnt;
 223        struct dentry *d_locking_state;
 224        struct list_head d_lockres_tracking;
 225};
 226
 227enum ocfs2_vol_state
 228{
 229        VOLUME_INIT = 0,
 230        VOLUME_MOUNTED,
 231        VOLUME_MOUNTED_QUOTAS,
 232        VOLUME_DISMOUNTED,
 233        VOLUME_DISABLED
 234};
 235
 236struct 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
 245enum 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
 256enum 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
 284struct ocfs2_journal;
 285struct ocfs2_slot_info;
 286struct ocfs2_recovery_map;
 287struct ocfs2_replay_map;
 288struct ocfs2_quota_recovery;
 289struct ocfs2_dentry_lock;
 290struct 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 */
 457typedef int (*ocfs2_journal_access_func)(handle_t *handle,
 458                                         struct ocfs2_caching_info *ci,
 459                                         struct buffer_head *bh, int type);
 460
 461static 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
 470static 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
 477static 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
 490static 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
 497static 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
 504static 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
 511static 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
 518static 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
 525static 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
 532static 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
 543static 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
 554static 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
 563static 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! */
 574static 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
 583static 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
 594static 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
 606static 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
 617static 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
 628static 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
 635static 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
 644static 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
 653static 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
 659static inline int ocfs2_mount_local(struct ocfs2_super *osb)
 660{
 661        return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
 662}
 663
 664static 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
 696static inline unsigned long ino_from_blkno(struct super_block *sb,
 697                                           u64 blkno)
 698{
 699        return (unsigned long)(blkno & (u64)ULONG_MAX);
 700}
 701
 702static 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
 711static 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
 720static 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
 733static 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
 740static 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
 746static 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
 756static 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
 766static 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
 775static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
 776{
 777        return (unsigned long)((bytes + 511) >> 9);
 778}
 779
 780static 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 */
 797static 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
 812static 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
 823static 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
 831static 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
 837static 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
 843static 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
 853static 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
 867static 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
 873static 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
 879static 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
 885static 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
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