fs/ocfs2/ocfs2.h

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This source file includes following definitions.
ocfs2_should_order_data
ocfs2_sparse_alloc
ocfs2_writes_unwritten_extents
ocfs2_supports_append_dio
ocfs2_supports_inline_data
ocfs2_supports_xattr
ocfs2_meta_ecc
ocfs2_supports_indexed_dirs
ocfs2_supports_discontig_bg
ocfs2_link_max
ocfs2_read_links_count
ocfs2_set_links_count
ocfs2_add_links_count
ocfs2_refcount_tree
ocfs2_set_osb_flag
ocfs2_set_ro_flag
ocfs2_is_hard_readonly
ocfs2_is_soft_readonly
ocfs2_clusterinfo_valid
ocfs2_userspace_stack
ocfs2_o2cb_stack
ocfs2_cluster_o2cb_global_heartbeat
ocfs2_mount_local
ocfs2_uses_extended_slot_map
ino_from_blkno
ocfs2_clusters_to_blocks
ocfs2_clusters_for_blocks
ocfs2_blocks_to_clusters
ocfs2_clusters_for_bytes
ocfs2_bytes_to_clusters
ocfs2_blocks_for_bytes
ocfs2_clusters_to_bytes
ocfs2_block_to_cluster_start
ocfs2_align_bytes_to_clusters
ocfs2_align_bytes_to_blocks
ocfs2_align_bytes_to_sectors
ocfs2_page_index_to_clusters
ocfs2_align_clusters_to_page_index
ocfs2_pages_per_cluster
ocfs2_megabytes_to_clusters
ocfs2_clusters_to_megabytes
_ocfs2_set_bit
_ocfs2_clear_bit
correct_addr_and_bit_unaligned
ocfs2_set_bit_unaligned
ocfs2_clear_bit_unaligned
ocfs2_test_bit_unaligned
ocfs2_find_next_zero_bit_unaligned
   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* -*- mode: c; c-basic-offset: 8; -*-
   3  * vim: noexpandtab sw=8 ts=8 sts=0:
   4  *
   5  * ocfs2.h
   6  *
   7  * Defines macros and structures used in OCFS2
   8  *
   9  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  10  */
  11 
  12 #ifndef OCFS2_H
  13 #define OCFS2_H
  14 
  15 #include <linux/spinlock.h>
  16 #include <linux/sched.h>
  17 #include <linux/wait.h>
  18 #include <linux/list.h>
  19 #include <linux/llist.h>
  20 #include <linux/rbtree.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/kref.h>
  23 #include <linux/mutex.h>
  24 #include <linux/lockdep.h>
  25 #include <linux/jbd2.h>
  26 
  27 /* For union ocfs2_dlm_lksb */
  28 #include "stackglue.h"
  29 
  30 #include "ocfs2_fs.h"
  31 #include "ocfs2_lockid.h"
  32 #include "ocfs2_ioctl.h"
  33 
  34 /* For struct ocfs2_blockcheck_stats */
  35 #include "blockcheck.h"
  36 
  37 #include "reservations.h"
  38 
  39 #include "filecheck.h"
  40 
  41 /* Caching of metadata buffers */
  42 
  43 /* Most user visible OCFS2 inodes will have very few pieces of
  44  * metadata, but larger files (including bitmaps, etc) must be taken
  45  * into account when designing an access scheme. We allow a small
  46  * amount of inlined blocks to be stored on an array and grow the
  47  * structure into a rb tree when necessary. */
  48 #define OCFS2_CACHE_INFO_MAX_ARRAY 2
  49 
  50 /* Flags for ocfs2_caching_info */
  51 
  52 enum ocfs2_caching_info_flags {
  53         /* Indicates that the metadata cache is using the inline array */
  54         OCFS2_CACHE_FL_INLINE   = 1<<1,
  55 };
  56 
  57 struct ocfs2_caching_operations;
  58 struct ocfs2_caching_info {
  59         /*
  60          * The parent structure provides the locks, but because the
  61          * parent structure can differ, it provides locking operations
  62          * to struct ocfs2_caching_info.
  63          */
  64         const struct ocfs2_caching_operations *ci_ops;
  65 
  66         /* next two are protected by trans_inc_lock */
  67         /* which transaction were we created on? Zero if none. */
  68         unsigned long           ci_created_trans;
  69         /* last transaction we were a part of. */
  70         unsigned long           ci_last_trans;
  71 
  72         /* Cache structures */
  73         unsigned int            ci_flags;
  74         unsigned int            ci_num_cached;
  75         union {
  76         sector_t        ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
  77                 struct rb_root  ci_tree;
  78         } ci_cache;
  79 };
  80 /*
  81  * Need this prototype here instead of in uptodate.h because journal.h
  82  * uses it.
  83  */
  84 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
  85 
  86 /* this limits us to 256 nodes
  87  * if we need more, we can do a kmalloc for the map */
  88 #define OCFS2_NODE_MAP_MAX_NODES    256
  89 struct ocfs2_node_map {
  90         u16 num_nodes;
  91         unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
  92 };
  93 
  94 enum ocfs2_ast_action {
  95         OCFS2_AST_INVALID = 0,
  96         OCFS2_AST_ATTACH,
  97         OCFS2_AST_CONVERT,
  98         OCFS2_AST_DOWNCONVERT,
  99 };
 100 
 101 /* actions for an unlockast function to take. */
 102 enum ocfs2_unlock_action {
 103         OCFS2_UNLOCK_INVALID = 0,
 104         OCFS2_UNLOCK_CANCEL_CONVERT,
 105         OCFS2_UNLOCK_DROP_LOCK,
 106 };
 107 
 108 /* ocfs2_lock_res->l_flags flags. */
 109 #define OCFS2_LOCK_ATTACHED      (0x00000001) /* we have initialized
 110                                                * the lvb */
 111 #define OCFS2_LOCK_BUSY          (0x00000002) /* we are currently in
 112                                                * dlm_lock */
 113 #define OCFS2_LOCK_BLOCKED       (0x00000004) /* blocked waiting to
 114                                                * downconvert*/
 115 #define OCFS2_LOCK_LOCAL         (0x00000008) /* newly created inode */
 116 #define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
 117 #define OCFS2_LOCK_REFRESHING    (0x00000020)
 118 #define OCFS2_LOCK_INITIALIZED   (0x00000040) /* track initialization
 119                                                * for shutdown paths */
 120 #define OCFS2_LOCK_FREEING       (0x00000080) /* help dlmglue track
 121                                                * when to skip queueing
 122                                                * a lock because it's
 123                                                * about to be
 124                                                * dropped. */
 125 #define OCFS2_LOCK_QUEUED        (0x00000100) /* queued for downconvert */
 126 #define OCFS2_LOCK_NOCACHE       (0x00000200) /* don't use a holder count */
 127 #define OCFS2_LOCK_PENDING       (0x00000400) /* This lockres is pending a
 128                                                  call to dlm_lock.  Only
 129                                                  exists with BUSY set. */
 130 #define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread
 131                                                      * from downconverting
 132                                                      * before the upconvert
 133                                                      * has completed */
 134 
 135 #define OCFS2_LOCK_NONBLOCK_FINISHED (0x00001000) /* NONBLOCK cluster
 136                                                    * lock has already
 137                                                    * returned, do not block
 138                                                    * dc thread from
 139                                                    * downconverting */
 140 
 141 struct ocfs2_lock_res_ops;
 142 
 143 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
 144 
 145 #ifdef CONFIG_OCFS2_FS_STATS
 146 struct ocfs2_lock_stats {
 147         u64             ls_total;       /* Total wait in NSEC */
 148         u32             ls_gets;        /* Num acquires */
 149         u32             ls_fail;        /* Num failed acquires */
 150 
 151         /* Storing max wait in usecs saves 24 bytes per inode */
 152         u32             ls_max;         /* Max wait in USEC */
 153         u64             ls_last;        /* Last unlock time in USEC */
 154 };
 155 #endif
 156 
 157 struct ocfs2_lock_res {
 158         void                    *l_priv;
 159         struct ocfs2_lock_res_ops *l_ops;
 160 
 161 
 162         struct list_head         l_blocked_list;
 163         struct list_head         l_mask_waiters;
 164         struct list_head         l_holders;
 165 
 166         unsigned long            l_flags;
 167         char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
 168         unsigned int             l_ro_holders;
 169         unsigned int             l_ex_holders;
 170         signed char              l_level;
 171         signed char              l_requested;
 172         signed char              l_blocking;
 173 
 174         /* Data packed - type enum ocfs2_lock_type */
 175         unsigned char            l_type;
 176 
 177         /* used from AST/BAST funcs. */
 178         /* Data packed - enum type ocfs2_ast_action */
 179         unsigned char            l_action;
 180         /* Data packed - enum type ocfs2_unlock_action */
 181         unsigned char            l_unlock_action;
 182         unsigned int             l_pending_gen;
 183 
 184         spinlock_t               l_lock;
 185 
 186         struct ocfs2_dlm_lksb    l_lksb;
 187 
 188         wait_queue_head_t        l_event;
 189 
 190         struct list_head         l_debug_list;
 191 
 192 #ifdef CONFIG_OCFS2_FS_STATS
 193         struct ocfs2_lock_stats  l_lock_prmode;         /* PR mode stats */
 194         u32                      l_lock_refresh;        /* Disk refreshes */
 195         u64                      l_lock_wait;   /* First lock wait time */
 196         struct ocfs2_lock_stats  l_lock_exmode;         /* EX mode stats */
 197 #endif
 198 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 199         struct lockdep_map       l_lockdep_map;
 200 #endif
 201 };
 202 
 203 enum ocfs2_orphan_reco_type {
 204         ORPHAN_NO_NEED_TRUNCATE = 0,
 205         ORPHAN_NEED_TRUNCATE,
 206 };
 207 
 208 enum ocfs2_orphan_scan_state {
 209         ORPHAN_SCAN_ACTIVE,
 210         ORPHAN_SCAN_INACTIVE
 211 };
 212 
 213 struct ocfs2_orphan_scan {
 214         struct mutex            os_lock;
 215         struct ocfs2_super      *os_osb;
 216         struct ocfs2_lock_res   os_lockres;     /* lock to synchronize scans */
 217         struct delayed_work     os_orphan_scan_work;
 218         time64_t                os_scantime;  /* time this node ran the scan */
 219         u32                     os_count;      /* tracks node specific scans */
 220         u32                     os_seqno;       /* tracks cluster wide scans */
 221         atomic_t                os_state;              /* ACTIVE or INACTIVE */
 222 };
 223 
 224 struct ocfs2_dlm_debug {
 225         struct kref d_refcnt;
 226         u32 d_filter_secs;
 227         struct list_head d_lockres_tracking;
 228 };
 229 
 230 enum ocfs2_vol_state
 231 {
 232         VOLUME_INIT = 0,
 233         VOLUME_MOUNTED,
 234         VOLUME_MOUNTED_QUOTAS,
 235         VOLUME_DISMOUNTED,
 236         VOLUME_DISABLED
 237 };
 238 
 239 struct ocfs2_alloc_stats
 240 {
 241         atomic_t moves;
 242         atomic_t local_data;
 243         atomic_t bitmap_data;
 244         atomic_t bg_allocs;
 245         atomic_t bg_extends;
 246 };
 247 
 248 enum ocfs2_local_alloc_state
 249 {
 250         OCFS2_LA_UNUSED = 0,    /* Local alloc will never be used for
 251                                  * this mountpoint. */
 252         OCFS2_LA_ENABLED,       /* Local alloc is in use. */
 253         OCFS2_LA_THROTTLED,     /* Local alloc is in use, but number
 254                                  * of bits has been reduced. */
 255         OCFS2_LA_DISABLED       /* Local alloc has temporarily been
 256                                  * disabled. */
 257 };
 258 
 259 enum ocfs2_mount_options
 260 {
 261         OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */
 262         OCFS2_MOUNT_BARRIER = 1 << 1,   /* Use block barriers */
 263         OCFS2_MOUNT_NOINTR  = 1 << 2,   /* Don't catch signals */
 264         OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
 265         OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
 266         OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
 267         OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
 268         OCFS2_MOUNT_INODE64 = 1 << 7,   /* Allow inode numbers > 2^32 */
 269         OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */
 270         OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9,      /* Disable POSIX access
 271                                                    control lists */
 272         OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
 273         OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
 274         OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT
 275                                                      writes */
 276         OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
 277         OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
 278 
 279         OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15,  /* Journal Async Commit */
 280         OCFS2_MOUNT_ERRORS_CONT = 1 << 16, /* Return EIO to the calling process on error */
 281         OCFS2_MOUNT_ERRORS_ROFS = 1 << 17, /* Change filesystem to read-only on error */
 282 };
 283 
 284 #define OCFS2_OSB_SOFT_RO       0x0001
 285 #define OCFS2_OSB_HARD_RO       0x0002
 286 #define OCFS2_OSB_ERROR_FS      0x0004
 287 #define OCFS2_DEFAULT_ATIME_QUANTUM     60
 288 
 289 struct ocfs2_journal;
 290 struct ocfs2_slot_info;
 291 struct ocfs2_recovery_map;
 292 struct ocfs2_replay_map;
 293 struct ocfs2_quota_recovery;
 294 struct ocfs2_super
 295 {
 296         struct task_struct *commit_task;
 297         struct super_block *sb;
 298         struct inode *root_inode;
 299         struct inode *sys_root_inode;
 300         struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES];
 301         struct inode **local_system_inodes;
 302 
 303         struct ocfs2_slot_info *slot_info;
 304 
 305         u32 *slot_recovery_generations;
 306 
 307         spinlock_t node_map_lock;
 308 
 309         u64 root_blkno;
 310         u64 system_dir_blkno;
 311         u64 bitmap_blkno;
 312         u32 bitmap_cpg;
 313         char *uuid_str;
 314         u32 uuid_hash;
 315         u8 *vol_label;
 316         u64 first_cluster_group_blkno;
 317         u32 fs_generation;
 318 
 319         u32 s_feature_compat;
 320         u32 s_feature_incompat;
 321         u32 s_feature_ro_compat;
 322 
 323         /* Protects s_next_generation, osb_flags and s_inode_steal_slot.
 324          * Could protect more on osb as it's very short lived.
 325          */
 326         spinlock_t osb_lock;
 327         u32 s_next_generation;
 328         unsigned long osb_flags;
 329         s16 s_inode_steal_slot;
 330         s16 s_meta_steal_slot;
 331         atomic_t s_num_inodes_stolen;
 332         atomic_t s_num_meta_stolen;
 333 
 334         unsigned long s_mount_opt;
 335         unsigned int s_atime_quantum;
 336 
 337         unsigned int max_slots;
 338         unsigned int node_num;
 339         int slot_num;
 340         int preferred_slot;
 341         int s_sectsize_bits;
 342         int s_clustersize;
 343         int s_clustersize_bits;
 344         unsigned int s_xattr_inline_size;
 345 
 346         atomic_t vol_state;
 347         struct mutex recovery_lock;
 348         struct ocfs2_recovery_map *recovery_map;
 349         struct ocfs2_replay_map *replay_map;
 350         struct task_struct *recovery_thread_task;
 351         int disable_recovery;
 352         wait_queue_head_t checkpoint_event;
 353         struct ocfs2_journal *journal;
 354         unsigned long osb_commit_interval;
 355 
 356         struct delayed_work             la_enable_wq;
 357 
 358         /*
 359          * Must hold local alloc i_mutex and osb->osb_lock to change
 360          * local_alloc_bits. Reads can be done under either lock.
 361          */
 362         unsigned int local_alloc_bits;
 363         unsigned int local_alloc_default_bits;
 364         /* osb_clusters_at_boot can become stale! Do not trust it to
 365          * be up to date. */
 366         unsigned int osb_clusters_at_boot;
 367 
 368         enum ocfs2_local_alloc_state local_alloc_state; /* protected
 369                                                          * by osb_lock */
 370 
 371         struct buffer_head *local_alloc_bh;
 372 
 373         u64 la_last_gd;
 374 
 375         struct ocfs2_reservation_map    osb_la_resmap;
 376 
 377         unsigned int    osb_resv_level;
 378         unsigned int    osb_dir_resv_level;
 379 
 380         /* Next two fields are for local node slot recovery during
 381          * mount. */
 382         struct ocfs2_dinode *local_alloc_copy;
 383         struct ocfs2_quota_recovery *quota_rec;
 384 
 385         struct ocfs2_blockcheck_stats osb_ecc_stats;
 386         struct ocfs2_alloc_stats alloc_stats;
 387         char dev_str[20];               /* "major,minor" of the device */
 388 
 389         u8 osb_stackflags;
 390 
 391         char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
 392         char osb_cluster_name[OCFS2_CLUSTER_NAME_LEN + 1];
 393         struct ocfs2_cluster_connection *cconn;
 394         struct ocfs2_lock_res osb_super_lockres;
 395         struct ocfs2_lock_res osb_rename_lockres;
 396         struct ocfs2_lock_res osb_nfs_sync_lockres;
 397         struct ocfs2_lock_res osb_trim_fs_lockres;
 398         struct mutex obs_trim_fs_mutex;
 399         struct ocfs2_dlm_debug *osb_dlm_debug;
 400 
 401         struct dentry *osb_debug_root;
 402 
 403         wait_queue_head_t recovery_event;
 404 
 405         spinlock_t dc_task_lock;
 406         struct task_struct *dc_task;
 407         wait_queue_head_t dc_event;
 408         unsigned long dc_wake_sequence;
 409         unsigned long dc_work_sequence;
 410 
 411         /*
 412          * Any thread can add locks to the list, but the downconvert
 413          * thread is the only one allowed to remove locks. Any change
 414          * to this rule requires updating
 415          * ocfs2_downconvert_thread_do_work().
 416          */
 417         struct list_head blocked_lock_list;
 418         unsigned long blocked_lock_count;
 419 
 420         /* List of dquot structures to drop last reference to */
 421         struct llist_head dquot_drop_list;
 422         struct work_struct dquot_drop_work;
 423 
 424         wait_queue_head_t               osb_mount_event;
 425 
 426         /* Truncate log info */
 427         struct inode                    *osb_tl_inode;
 428         struct buffer_head              *osb_tl_bh;
 429         struct delayed_work             osb_truncate_log_wq;
 430         atomic_t                        osb_tl_disable;
 431         /*
 432          * How many clusters in our truncate log.
 433          * It must be protected by osb_tl_inode->i_mutex.
 434          */
 435         unsigned int truncated_clusters;
 436 
 437         struct ocfs2_node_map           osb_recovering_orphan_dirs;
 438         unsigned int                    *osb_orphan_wipes;
 439         wait_queue_head_t               osb_wipe_event;
 440 
 441         struct ocfs2_orphan_scan        osb_orphan_scan;
 442 
 443         /* used to protect metaecc calculation check of xattr. */
 444         spinlock_t osb_xattr_lock;
 445 
 446         unsigned int                    osb_dx_mask;
 447         u32                             osb_dx_seed[4];
 448 
 449         /* the group we used to allocate inodes. */
 450         u64                             osb_inode_alloc_group;
 451 
 452         /* rb tree root for refcount lock. */
 453         struct rb_root  osb_rf_lock_tree;
 454         struct ocfs2_refcount_tree *osb_ref_tree_lru;
 455 
 456         struct mutex system_file_mutex;
 457 
 458         /*
 459          * OCFS2 needs to schedule several different types of work which
 460          * require cluster locking, disk I/O, recovery waits, etc. Since these
 461          * types of work tend to be heavy we avoid using the kernel events
 462          * workqueue and schedule on our own.
 463          */
 464         struct workqueue_struct *ocfs2_wq;
 465 
 466         /* sysfs directory per partition */
 467         struct kset *osb_dev_kset;
 468 
 469         /* file check related stuff */
 470         struct ocfs2_filecheck_sysfs_entry osb_fc_ent;
 471 };
 472 
 473 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
 474 
 475 /* Useful typedef for passing around journal access functions */
 476 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
 477                                          struct ocfs2_caching_info *ci,
 478                                          struct buffer_head *bh, int type);
 479 
 480 static inline int ocfs2_should_order_data(struct inode *inode)
 481 {
 482         if (!S_ISREG(inode->i_mode))
 483                 return 0;
 484         if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
 485                 return 0;
 486         return 1;
 487 }
 488 
 489 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
 490 {
 491         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
 492                 return 1;
 493         return 0;
 494 }
 495 
 496 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
 497 {
 498         /*
 499          * Support for sparse files is a pre-requisite
 500          */
 501         if (!ocfs2_sparse_alloc(osb))
 502                 return 0;
 503 
 504         if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
 505                 return 1;
 506         return 0;
 507 }
 508 
 509 static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb)
 510 {
 511         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_APPEND_DIO)
 512                 return 1;
 513         return 0;
 514 }
 515 
 516 
 517 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
 518 {
 519         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
 520                 return 1;
 521         return 0;
 522 }
 523 
 524 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
 525 {
 526         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
 527                 return 1;
 528         return 0;
 529 }
 530 
 531 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
 532 {
 533         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
 534                 return 1;
 535         return 0;
 536 }
 537 
 538 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
 539 {
 540         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
 541                 return 1;
 542         return 0;
 543 }
 544 
 545 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
 546 {
 547         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
 548                 return 1;
 549         return 0;
 550 }
 551 
 552 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
 553 {
 554         if (ocfs2_supports_indexed_dirs(osb))
 555                 return OCFS2_DX_LINK_MAX;
 556         return OCFS2_LINK_MAX;
 557 }
 558 
 559 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
 560 {
 561         u32 nlink = le16_to_cpu(di->i_links_count);
 562         u32 hi = le16_to_cpu(di->i_links_count_hi);
 563 
 564         if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
 565                 nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
 566 
 567         return nlink;
 568 }
 569 
 570 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
 571 {
 572         u16 lo, hi;
 573 
 574         lo = nlink;
 575         hi = nlink >> OCFS2_LINKS_HI_SHIFT;
 576 
 577         di->i_links_count = cpu_to_le16(lo);
 578         di->i_links_count_hi = cpu_to_le16(hi);
 579 }
 580 
 581 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
 582 {
 583         u32 links = ocfs2_read_links_count(di);
 584 
 585         links += n;
 586 
 587         ocfs2_set_links_count(di, links);
 588 }
 589 
 590 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
 591 {
 592         if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
 593                 return 1;
 594         return 0;
 595 }
 596 
 597 /* set / clear functions because cluster events can make these happen
 598  * in parallel so we want the transitions to be atomic. this also
 599  * means that any future flags osb_flags must be protected by spinlock
 600  * too! */
 601 static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
 602                                       unsigned long flag)
 603 {
 604         spin_lock(&osb->osb_lock);
 605         osb->osb_flags |= flag;
 606         spin_unlock(&osb->osb_lock);
 607 }
 608 
 609 static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
 610                                      int hard)
 611 {
 612         spin_lock(&osb->osb_lock);
 613         osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
 614         if (hard)
 615                 osb->osb_flags |= OCFS2_OSB_HARD_RO;
 616         else
 617                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 618         spin_unlock(&osb->osb_lock);
 619 }
 620 
 621 static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
 622 {
 623         int ret;
 624 
 625         spin_lock(&osb->osb_lock);
 626         ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
 627         spin_unlock(&osb->osb_lock);
 628 
 629         return ret;
 630 }
 631 
 632 static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
 633 {
 634         int ret;
 635 
 636         spin_lock(&osb->osb_lock);
 637         ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
 638         spin_unlock(&osb->osb_lock);
 639 
 640         return ret;
 641 }
 642 
 643 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb)
 644 {
 645         return (osb->s_feature_incompat &
 646                 (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK |
 647                  OCFS2_FEATURE_INCOMPAT_CLUSTERINFO));
 648 }
 649 
 650 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
 651 {
 652         if (ocfs2_clusterinfo_valid(osb) &&
 653             memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
 654                    OCFS2_STACK_LABEL_LEN))
 655                 return 1;
 656         return 0;
 657 }
 658 
 659 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb)
 660 {
 661         if (ocfs2_clusterinfo_valid(osb) &&
 662             !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
 663                    OCFS2_STACK_LABEL_LEN))
 664                 return 1;
 665         return 0;
 666 }
 667 
 668 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb)
 669 {
 670         return ocfs2_o2cb_stack(osb) &&
 671                 (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT);
 672 }
 673 
 674 static inline int ocfs2_mount_local(struct ocfs2_super *osb)
 675 {
 676         return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
 677 }
 678 
 679 static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
 680 {
 681         return (osb->s_feature_incompat &
 682                 OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
 683 }
 684 
 685 
 686 #define OCFS2_IS_VALID_DINODE(ptr)                                      \
 687         (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
 688 
 689 #define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \
 690         (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
 691 
 692 #define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \
 693         (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
 694 
 695 
 696 #define OCFS2_IS_VALID_XATTR_BLOCK(ptr)                                 \
 697         (!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
 698 
 699 #define OCFS2_IS_VALID_DIR_TRAILER(ptr)                                 \
 700         (!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
 701 
 702 #define OCFS2_IS_VALID_DX_ROOT(ptr)                                     \
 703         (!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
 704 
 705 #define OCFS2_IS_VALID_DX_LEAF(ptr)                                     \
 706         (!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
 707 
 708 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr)                              \
 709         (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_SIGNATURE))
 710 
 711 static inline unsigned long ino_from_blkno(struct super_block *sb,
 712                                            u64 blkno)
 713 {
 714         return (unsigned long)(blkno & (u64)ULONG_MAX);
 715 }
 716 
 717 static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
 718                                            u32 clusters)
 719 {
 720         int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
 721                 sb->s_blocksize_bits;
 722 
 723         return (u64)clusters << c_to_b_bits;
 724 }
 725 
 726 static inline u32 ocfs2_clusters_for_blocks(struct super_block *sb,
 727                 u64 blocks)
 728 {
 729         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
 730                         sb->s_blocksize_bits;
 731 
 732         blocks += (1 << b_to_c_bits) - 1;
 733         return (u32)(blocks >> b_to_c_bits);
 734 }
 735 
 736 static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
 737                                            u64 blocks)
 738 {
 739         int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
 740                 sb->s_blocksize_bits;
 741 
 742         return (u32)(blocks >> b_to_c_bits);
 743 }
 744 
 745 static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
 746                                                     u64 bytes)
 747 {
 748         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 749         unsigned int clusters;
 750 
 751         bytes += OCFS2_SB(sb)->s_clustersize - 1;
 752         /* OCFS2 just cannot have enough clusters to overflow this */
 753         clusters = (unsigned int)(bytes >> cl_bits);
 754 
 755         return clusters;
 756 }
 757 
 758 static inline unsigned int ocfs2_bytes_to_clusters(struct super_block *sb,
 759                 u64 bytes)
 760 {
 761         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 762         unsigned int clusters;
 763 
 764         clusters = (unsigned int)(bytes >> cl_bits);
 765         return clusters;
 766 }
 767 
 768 static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
 769                                          u64 bytes)
 770 {
 771         bytes += sb->s_blocksize - 1;
 772         return bytes >> sb->s_blocksize_bits;
 773 }
 774 
 775 static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
 776                                           u32 clusters)
 777 {
 778         return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
 779 }
 780 
 781 static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
 782                                                u64 blocks)
 783 {
 784         int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
 785         unsigned int clusters;
 786 
 787         clusters = ocfs2_blocks_to_clusters(sb, blocks);
 788         return (u64)clusters << bits;
 789 }
 790 
 791 static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
 792                                                 u64 bytes)
 793 {
 794         int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
 795         unsigned int clusters;
 796 
 797         clusters = ocfs2_clusters_for_bytes(sb, bytes);
 798         return (u64)clusters << cl_bits;
 799 }
 800 
 801 static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
 802                                               u64 bytes)
 803 {
 804         u64 blocks;
 805 
 806         blocks = ocfs2_blocks_for_bytes(sb, bytes);
 807         return blocks << sb->s_blocksize_bits;
 808 }
 809 
 810 static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
 811 {
 812         return (unsigned long)((bytes + 511) >> 9);
 813 }
 814 
 815 static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
 816                                                         unsigned long pg_index)
 817 {
 818         u32 clusters = pg_index;
 819         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
 820 
 821         if (unlikely(PAGE_SHIFT > cbits))
 822                 clusters = pg_index << (PAGE_SHIFT - cbits);
 823         else if (PAGE_SHIFT < cbits)
 824                 clusters = pg_index >> (cbits - PAGE_SHIFT);
 825 
 826         return clusters;
 827 }
 828 
 829 /*
 830  * Find the 1st page index which covers the given clusters.
 831  */
 832 static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
 833                                                         u32 clusters)
 834 {
 835         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
 836         pgoff_t index = clusters;
 837 
 838         if (PAGE_SHIFT > cbits) {
 839                 index = (pgoff_t)clusters >> (PAGE_SHIFT - cbits);
 840         } else if (PAGE_SHIFT < cbits) {
 841                 index = (pgoff_t)clusters << (cbits - PAGE_SHIFT);
 842         }
 843 
 844         return index;
 845 }
 846 
 847 static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
 848 {
 849         unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
 850         unsigned int pages_per_cluster = 1;
 851 
 852         if (PAGE_SHIFT < cbits)
 853                 pages_per_cluster = 1 << (cbits - PAGE_SHIFT);
 854 
 855         return pages_per_cluster;
 856 }
 857 
 858 static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
 859                                                        unsigned int megs)
 860 {
 861         BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
 862 
 863         return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
 864 }
 865 
 866 static inline unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
 867                                                        unsigned int clusters)
 868 {
 869         return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
 870 }
 871 
 872 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
 873 {
 874         __set_bit_le(bit, bitmap);
 875 }
 876 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
 877 
 878 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
 879 {
 880         __clear_bit_le(bit, bitmap);
 881 }
 882 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
 883 
 884 #define ocfs2_test_bit test_bit_le
 885 #define ocfs2_find_next_zero_bit find_next_zero_bit_le
 886 #define ocfs2_find_next_bit find_next_bit_le
 887 
 888 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr)
 889 {
 890 #if BITS_PER_LONG == 64
 891         *bit += ((unsigned long) addr & 7UL) << 3;
 892         addr = (void *) ((unsigned long) addr & ~7UL);
 893 #elif BITS_PER_LONG == 32
 894         *bit += ((unsigned long) addr & 3UL) << 3;
 895         addr = (void *) ((unsigned long) addr & ~3UL);
 896 #else
 897 #error "how many bits you are?!"
 898 #endif
 899         return addr;
 900 }
 901 
 902 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap)
 903 {
 904         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
 905         ocfs2_set_bit(bit, bitmap);
 906 }
 907 
 908 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap)
 909 {
 910         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
 911         ocfs2_clear_bit(bit, bitmap);
 912 }
 913 
 914 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap)
 915 {
 916         bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
 917         return ocfs2_test_bit(bit, bitmap);
 918 }
 919 
 920 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max,
 921                                                         int start)
 922 {
 923         int fix = 0, ret, tmpmax;
 924         bitmap = correct_addr_and_bit_unaligned(&fix, bitmap);
 925         tmpmax = max + fix;
 926         start += fix;
 927 
 928         ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix;
 929         if (ret > max)
 930                 return max;
 931         return ret;
 932 }
 933 
 934 #endif  /* OCFS2_H */
 935
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root/fs/ocfs2/ocfs2.h

INCLUDED FROM

DEFINITIONS
