bsd/hfs/hfs.h

   1 /*
   2  * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifndef __HFS__
  30 #define __HFS__
  31
  32 #define HFS_SPARSE_DEV 1
  33
  34 #include <sys/appleapiopts.h>
  35
  36 #ifdef KERNEL
  37 #ifdef __APPLE_API_PRIVATE
  38 #include <sys/param.h>
  39 #include <sys/queue.h>
  40 #include <sys/mount.h>
  41 #include <sys/vnode.h>
  42 #include <sys/quota.h>
  43 #include <sys/dirent.h>
  44 #include <sys/event.h>
  45
  46 #include <kern/locks.h>
  47
  48 #include <vfs/vfs_journal.h>
  49
  50 #include <hfs/hfs_format.h>
  51 #include <hfs/hfs_catalog.h>
  52 #include <hfs/hfs_cnode.h>
  53 #include <hfs/hfs_macos_defs.h>
  54 #include <hfs/hfs_encodings.h>
  55 #include <hfs/hfs_hotfiles.h>
  56
  57 /*
  58  *      Just reported via MIG interface.
  59  */
  60 #define VERSION_STRING  "hfs-2 (4-12-99)"
  61
  62 #define HFS_LINK_MAX    32767
  63
  64 #define HFS_MAX_DEFERED_ALLOC   (1024*1024)
  65
  66 // 32 gigs is a "big" file (i.e. one that when deleted
  67 // would touch enough data that we should break it into
  68 // multiple separate transactions
  69 #define HFS_BIGFILE_SIZE (32LL * 1024LL * 1024LL * 1024LL)
  70
  71
  72 enum { kMDBSize = 512 };                                /* Size of I/O transfer to read entire MDB */
  73
  74 enum { kMasterDirectoryBlock = 2 };                     /* MDB offset on disk in 512-byte blocks */
  75 enum { kMDBOffset = kMasterDirectoryBlock * 512 };      /* MDB offset on disk in bytes */
  76
  77 #define kRootDirID kHFSRootFolderID
  78
  79
  80 /* number of locked buffer caches to hold for b-tree meta data */
  81 #define kMaxLockedMetaBuffers           32
  82
  83 /*
  84  *      File type and creator for symbolic links
  85  */
  86 enum {
  87         kSymLinkFileType  = 0x736C6E6B, /* 'slnk' */
  88         kSymLinkCreator   = 0x72686170  /* 'rhap' */
  89 };
  90
  91
  92 extern struct timezone gTimeZone;
  93
  94
  95 /* How many free extents to cache per volume */
  96 #define kMaxFreeExtents         10
  97
  98 /*
  99  * HFS_MINFREE gives the minimum acceptable percentage
 100  * of file system blocks which may be free (but this
 101  * minimum will never exceed HFS_MAXRESERVE bytes). If
 102  * the free block count drops below this level only the
 103  * superuser may continue to allocate blocks.
 104  */
 105 #define HFS_MINFREE             1
 106 #define HFS_MAXRESERVE          ((u_int64_t)(250*1024*1024))
 107
 108 /*
 109  * The system distinguishes between the desirable low-disk
 110  * notifiaction levels for root volumes and non-root volumes.
 111  * The various thresholds are computed as a fraction of the
 112  * volume size, all capped at a certain fixed level
 113  */
 114
 115 #define HFS_ROOTLOWDISKTRIGGERFRACTION 5
 116 #define HFS_ROOTLOWDISKTRIGGERLEVEL ((u_int64_t)(250*1024*1024))
 117 #define HFS_ROOTLOWDISKSHUTOFFFRACTION 6
 118 #define HFS_ROOTLOWDISKSHUTOFFLEVEL ((u_int64_t)(375*1024*1024))
 119
 120 #define HFS_LOWDISKTRIGGERFRACTION 1
 121 #define HFS_LOWDISKTRIGGERLEVEL ((u_int64_t)(50*1024*1024))
 122 #define HFS_LOWDISKSHUTOFFFRACTION 2
 123 #define HFS_LOWDISKSHUTOFFLEVEL ((u_int64_t)(75*1024*1024))
 124
 125 /* Internal Data structures*/
 126
 127
 128 #define kHFS_DamagedVolume  0x1 /* This volume has errors, unmount dirty */
 129
 130 /* XXX */
 131 #define MARK_VOLUMEDAMAGED(fcb)
 132
 133
 134 /* This structure describes the HFS specific mount structure data. */
 135 typedef struct hfsmount {
 136         u_int32_t     hfs_flags;              /* see below */
 137
 138         /* Physical Description */
 139         u_long        hfs_phys_block_size;    /* Always a multiple of 512 */
 140         daddr64_t     hfs_phys_block_count;   /* Num of PHYSICAL blocks of volume */
 141         daddr64_t     hfs_alt_id_sector;      /* location of alternate VH/MDB */
 142
 143         /* Access to VFS and devices */
 144         struct mount            *hfs_mp;                                /* filesystem vfs structure */
 145         struct vnode            *hfs_devvp;                             /* block device mounted vnode */
 146         struct vnode *          hfs_extents_vp;
 147         struct vnode *          hfs_catalog_vp;
 148         struct vnode *          hfs_allocation_vp;
 149         struct vnode *          hfs_attribute_vp;
 150         dev_t                   hfs_raw_dev;                    /* device mounted */
 151         u_int32_t               hfs_logBlockSize;               /* Size of buffer cache buffer for I/O */
 152
 153         /* Default values for HFS standard and non-init access */
 154         uid_t         hfs_uid;            /* uid to set as owner of the files */
 155         gid_t         hfs_gid;            /* gid to set as owner of the files */
 156         mode_t        hfs_dir_mask;       /* mask to and with directory protection bits */
 157         mode_t        hfs_file_mask;      /* mask to and with file protection bits */
 158         u_long        hfs_encoding;       /* Defualt encoding for non hfs+ volumes */
 159
 160         /* Persistent fields (on disk, dynamic) */
 161         time_t        hfs_mtime;          /* file system last modification time */
 162         u_int32_t     hfs_filecount;      /* number of files in file system */
 163         u_int32_t     hfs_dircount;       /* number of directories in file system */
 164         u_int32_t     freeBlocks;         /* free allocation blocks */
 165         u_int32_t     nextAllocation;     /* start of next allocation search */
 166         u_int32_t     vcbNxtCNID;         /* next unused catalog node ID */
 167         u_int32_t     vcbWrCnt;           /* file system write count */
 168         u_int64_t     encodingsBitmap;    /* in-use encodings */
 169         u_int16_t     vcbNmFls;           /* HFS Only - root dir file count */
 170         u_int16_t     vcbNmRtDirs;        /* HFS Only - root dir directory count */
 171
 172         /* Persistent fields (on disk, static) */
 173         u_int16_t                       vcbSigWord;
 174         int16_t                         vcbFlags;
 175         u_int32_t                       vcbAtrb;
 176         u_int32_t                       vcbJinfoBlock;
 177         time_t        hfs_itime;   /* file system creation time */
 178         time_t        hfs_btime;   /* file system last backup time */
 179         u_int32_t                       blockSize;      /* size of allocation blocks */
 180         u_int32_t                       totalBlocks;    /* total allocation blocks */
 181         int32_t                         vcbClpSiz;
 182         u_int32_t     vcbFndrInfo[8];
 183         int16_t                         vcbVBMSt;               /* HFS only */
 184         int16_t                         vcbAlBlSt;              /* HFS only */
 185
 186         /* vcb stuff */
 187         u_int8_t                        vcbVN[256];             /* volume name in UTF-8 */
 188         u_int32_t                       volumeNameEncodingHint;
 189         u_int32_t                       hfsPlusIOPosOffset;     /* Disk block where HFS+ starts */
 190         u_int32_t                       vcbVBMIOSize;           /* volume bitmap I/O size */
 191
 192         /* cache of largest known free extents */
 193         u_int32_t                       vcbFreeExtCnt;
 194         HFSPlusExtentDescriptor vcbFreeExt[kMaxFreeExtents];
 195
 196         u_int32_t               reserveBlocks;          /* free block reserve */
 197         u_int32_t               loanedBlocks;           /* blocks on loan for delayed allocations */
 198
 199         u_int32_t                       localCreateDate;        /* creation times for HFS+ volumes are in local time */
 200         struct cat_desc         hfs_privdir_desc;
 201         struct cat_attr         hfs_privdir_attr;
 202         u_int32_t               hfs_metadata_createdate;
 203         hfs_to_unicode_func_t   hfs_get_unicode;
 204         unicode_to_hfs_func_t   hfs_get_hfsname;
 205
 206         /* Quota variables: */
 207         struct quotafile        hfs_qfiles[MAXQUOTAS];    /* quota files */
 208
 209         /* Journaling variables: */
 210         void                *jnl;           // the journal for this volume (if one exists)
 211         struct vnode        *jvp;           // device where the journal lives (may be equal to devvp)
 212         u_int32_t            jnl_start;     // start block of the journal file (so we don't delete it)
 213         u_int32_t            jnl_size;
 214         u_int32_t            hfs_jnlfileid;
 215         u_int32_t            hfs_jnlinfoblkid;
 216         lck_rw_t             hfs_global_lock;
 217         u_int32_t            hfs_global_lock_nesting;
 218
 219         /* Notification variables: */
 220         unsigned long           hfs_notification_conditions;
 221         u_int32_t               hfs_freespace_notify_warninglimit;
 222         u_int32_t               hfs_freespace_notify_desiredlevel;
 223
 224         /* time mounted and last mounted mod time "snapshot" */
 225         time_t          hfs_mount_time;
 226         time_t          hfs_last_mounted_mtime;
 227
 228         /* Metadata allocation zone variables: */
 229         u_int32_t       hfs_metazone_start;
 230         u_int32_t       hfs_metazone_end;
 231         u_int32_t       hfs_hotfile_start;
 232         u_int32_t       hfs_hotfile_end;
 233         int             hfs_hotfile_freeblks;
 234         int             hfs_hotfile_maxblks;
 235         int             hfs_overflow_maxblks;
 236         int             hfs_catalog_maxblks;
 237
 238         /* Hot File Clustering variables: */
 239         lck_mtx_t       hfc_mutex;      /* serialize hot file stages */
 240         enum hfc_stage  hfc_stage;      /* what are we up to... */
 241         time_t          hfc_timebase;   /* recording period start time */
 242         time_t          hfc_timeout;    /* recording period stop time */
 243         void *          hfc_recdata;    /* recording data (opaque) */
 244         int             hfc_maxfiles;   /* maximum files to track */
 245         struct vnode *  hfc_filevp;
 246
 247 #ifdef HFS_SPARSE_DEV
 248         /* Sparse device variables: */
 249         struct vnode * hfs_backingfs_rootvp;
 250         int            hfs_sparsebandblks;
 251 #endif
 252         size_t         hfs_max_inline_attrsize;
 253
 254         lck_mtx_t      hfs_mutex;      /* protects access to hfsmount data */
 255         void          *hfs_freezing_proc;  /* who froze the fs */
 256         lck_rw_t       hfs_insync;     /* protects sync/freeze interaction */
 257 } hfsmount_t;
 258
 259 typedef hfsmount_t  ExtendedVCB;
 260
 261 /* Aliases for legacy field names */
 262 #define vcbCrDate          hfs_itime
 263 #define vcbLsMod           hfs_mtime
 264 #define vcbVolBkUp         hfs_btime
 265 #define extentsRefNum      hfs_extents_vp
 266 #define catalogRefNum      hfs_catalog_vp
 267 #define allocationsRefNum  hfs_allocation_vp
 268 #define vcbFilCnt          hfs_filecount
 269 #define vcbDirCnt          hfs_dircount
 270
 271
 272 /* HFS mount point flags */
 273 #define HFS_READ_ONLY             0x001
 274 #define HFS_UNKNOWN_PERMS         0x002
 275 #define HFS_WRITEABLE_MEDIA       0x004
 276 #define HFS_CLEANED_ORPHANS       0x008
 277 #define HFS_X                     0x010
 278 #define HFS_CASE_SENSITIVE        0x020
 279 #define HFS_STANDARD              0x040
 280 #define HFS_METADATA_ZONE         0x080
 281 #define HFS_FRAGMENTED_FREESPACE  0x100
 282 #define HFS_NEED_JNL_RESET        0x200
 283 #define HFS_HAS_SPARSE_DEVICE     0x400
 284
 285
 286 #define HFS_MOUNT_LOCK(hfsmp, metadata)                      \
 287         {                                                    \
 288                 if ((metadata) && 1)                         \
 289                         lck_mtx_lock(&(hfsmp)->hfs_mutex);   \
 290         }                                                    \
 291
 292 #define HFS_MOUNT_UNLOCK(hfsmp, metadata)                    \
 293         {                                                    \
 294                 if ((metadata) && 1)                         \
 295                         lck_mtx_unlock(&(hfsmp)->hfs_mutex); \
 296         }                                                    \
 297
 298 #define hfs_global_exclusive_lock_acquire(hfsmp) lck_rw_lock_exclusive(&(hfsmp)->hfs_global_lock)
 299 #define hfs_global_exclusive_lock_release(hfsmp) lck_rw_done(&(hfsmp)->hfs_global_lock)
 300
 301
 302 #define MAXHFSVNODELEN          31
 303
 304
 305 typedef struct filefork FCB;
 306
 307
 308 #define MAKE_INODE_NAME(name,linkno) \
 309             (void) sprintf((name), "%s%d", HFS_INODE_PREFIX, (linkno))
 310
 311 #define HFS_INODE_PREFIX_LEN    5
 312
 313
 314 #define HFS_AVERAGE_NAME_SIZE   22
 315 #define AVERAGE_HFSDIRENTRY_SIZE  (8+HFS_AVERAGE_NAME_SIZE+4)
 316
 317 #define STD_DIRENT_LEN(namlen) \
 318         ((sizeof(struct dirent) - (NAME_MAX+1)) + (((namlen)+1 + 3) &~ 3))
 319
 320 #define EXT_DIRENT_LEN(namlen) \
 321         ((sizeof(struct direntry) + (namlen) - (MAXPATHLEN-1) + 3) & ~3)
 322
 323
 324 enum { kHFSPlusMaxFileNameBytes = kHFSPlusMaxFileNameChars * 3 };
 325
 326
 327 /* macro to determine if hfs or hfsplus */
 328 #define ISHFSPLUS(VCB) ((VCB)->vcbSigWord == kHFSPlusSigWord)
 329 #define ISHFS(VCB) ((VCB)->vcbSigWord == kHFSSigWord)
 330
 331
 332 /*
 333  * Various ways to acquire a VFS mount point pointer:
 334  */
 335 #define VTOVFS(VP)  vnode_mount((VP))
 336 #define HFSTOVFS(HFSMP) ((HFSMP)->hfs_mp)
 337 #define VCBTOVFS(VCB)   HFSTOVFS(VCB)
 338
 339 /*
 340  * Various ways to acquire an HFS mount point pointer:
 341  */
 342 #define VTOHFS(VP)  ((struct hfsmount *)vfs_fsprivate(vnode_mount((VP))))
 343 #define VFSTOHFS(MP)  ((struct hfsmount *)vfs_fsprivate((MP)))
 344 #define VCBTOHFS(VCB) (VCB)
 345 #define FCBTOHFS(FCB)  ((struct hfsmount *)vfs_fsprivate(vnode_mount((FCB)->ff_cp->c_vp)))
 346
 347 /*
 348  * Various ways to acquire a VCB (legacy) pointer:
 349  */
 350 #define VTOVCB(VP)       VTOHFS(VP)
 351 #define VFSTOVCB(MP)     VFSTOHFS(MP)
 352 #define HFSTOVCB(HFSMP)  (HFSMP)
 353 #define FCBTOVCB(FCB)    FCBTOHFS(FCB)
 354
 355
 356 #define HFS_KNOTE(vp, hint) KNOTE(&VTOC(vp)->c_knotes, (hint))
 357
 358
 359 #define E_NONE  0
 360 #define kHFSBlockSize 512
 361
 362 /*
 363  * Macros for getting the MDB/VH sector and offset
 364  */
 365 #define HFS_PRI_SECTOR(blksize)          (1024 / (blksize))
 366 #define HFS_PRI_OFFSET(blksize)          ((blksize) > 1024 ? 1024 : 0)
 367
 368 #define HFS_ALT_SECTOR(blksize, blkcnt)  (((blkcnt) - 1) - (512 / (blksize)))
 369 #define HFS_ALT_OFFSET(blksize)          ((blksize) > 1024 ? (blksize) - 1024 : 0)
 370
 371
 372 /*
 373  * HFS specific fcntl()'s
 374  */
 375 #define HFS_BULKACCESS      (FCNTL_FS_SPECIFIC_BASE + 0x00001)
 376 #define HFS_GET_MOUNT_TIME  (FCNTL_FS_SPECIFIC_BASE + 0x00002)
 377 #define HFS_GET_LAST_MTIME  (FCNTL_FS_SPECIFIC_BASE + 0x00003)
 378 #define HFS_GET_BOOT_INFO   (FCNTL_FS_SPECIFIC_BASE + 0x00004)
 379 #define HFS_SET_BOOT_INFO   (FCNTL_FS_SPECIFIC_BASE + 0x00005)
 380
 381
 382 /*
 383  *      This is the straight GMT conversion constant:
 384  *      00:00:00 January 1, 1970 - 00:00:00 January 1, 1904
 385  *      (3600 * 24 * ((365 * (1970 - 1904)) + (((1970 - 1904) / 4) + 1)))
 386  */
 387 #define MAC_GMT_FACTOR          2082844800UL
 388
 389
 390 time_t to_bsd_time(u_int32_t hfs_time);
 391 u_int32_t to_hfs_time(time_t bsd_time);
 392
 393 int hfs_flushvolumeheader(struct hfsmount *hfsmp, int waitfor, int altflush);
 394 #define HFS_ALTFLUSH    1
 395
 396 extern int hfsUnmount(struct hfsmount *hfsmp, struct proc *p);
 397
 398 extern int hfs_getnewvnode(struct hfsmount *hfsmp, struct vnode *dvp, struct componentname *cnp,
 399                            struct cat_desc *descp, int wantrsrc, struct cat_attr *attrp,
 400                            struct cat_fork *forkp, struct vnode **vpp);
 401
 402 extern u_int32_t hfs_freeblks(struct hfsmount * hfsmp, int wantreserve);
 403
 404 extern void hfs_remove_orphans(struct hfsmount *);
 405
 406
 407 short MacToVFSError(OSErr err);
 408
 409 extern int hfs_owner_rights(struct hfsmount *hfsmp, uid_t cnode_uid, struct ucred *cred,
 410                 struct proc *p, int invokesuperuserstatus);
 411
 412 u_long FindMetaDataDirectory(ExtendedVCB *vcb);
 413
 414 #define  kMaxSecsForFsync       5
 415 #define  HFS_SYNCTRANS          1
 416
 417 extern int hfs_btsync(struct vnode *vp, int sync_transaction);
 418 // used as a callback by the journaling code
 419 extern void hfs_sync_metadata(void *arg);
 420
 421 short make_dir_entry(FCB **fileptr, char *name, u_int32_t fileID);
 422
 423
 424 unsigned long BestBlockSizeFit(unsigned long allocationBlockSize,
 425                                unsigned long blockSizeLimit,
 426                                unsigned long baseMultiple);
 427
 428 OSErr   hfs_MountHFSVolume(struct hfsmount *hfsmp, HFSMasterDirectoryBlock *mdb,
 429                 struct proc *p);
 430 OSErr   hfs_MountHFSPlusVolume(struct hfsmount *hfsmp, HFSPlusVolumeHeader *vhp,
 431                 off_t embeddedOffset, u_int64_t disksize, struct proc *p, void *args, kauth_cred_t cred);
 432
 433 extern int     hfs_early_journal_init(struct hfsmount *hfsmp, HFSPlusVolumeHeader *vhp,
 434                                                            void *_args, off_t embeddedOffset, daddr64_t mdb_offset,
 435                                                            HFSMasterDirectoryBlock *mdbp, struct ucred *cred);
 436 extern u_long  GetFileInfo(ExtendedVCB *vcb, u_int32_t dirid, const char *name,
 437                                                    struct cat_attr *fattr, struct cat_fork *forkinfo);
 438
 439 int hfs_getconverter(u_int32_t encoding, hfs_to_unicode_func_t *get_unicode,
 440                      unicode_to_hfs_func_t *get_hfsname);
 441
 442 int hfs_relconverter(u_int32_t encoding);
 443
 444 int hfs_to_utf8(ExtendedVCB *vcb, Str31 hfs_str, ByteCount maxDstLen,
 445                 ByteCount *actualDstLen, unsigned char* dstStr);
 446
 447 int utf8_to_hfs(ExtendedVCB *vcb, ByteCount srcLen, const unsigned char* srcStr,
 448                 Str31 dstStr);
 449
 450 int mac_roman_to_utf8(Str31 hfs_str, ByteCount maxDstLen, ByteCount *actualDstLen,
 451                 unsigned char* dstStr);
 452
 453 int utf8_to_mac_roman(ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr);
 454
 455 u_int32_t hfs_pickencoding(const u_int16_t *src, int len);
 456
 457 enum volop {VOL_UPDATE, VOL_MKDIR, VOL_RMDIR, VOL_MKFILE, VOL_RMFILE};
 458
 459 extern int hfs_volupdate(struct hfsmount *hfsmp, enum volop op, int inroot);
 460
 461 extern void hfs_setencodingbits(struct hfsmount *hfsmp, u_int32_t encoding);
 462
 463
 464 extern void replace_desc(struct cnode *cp, struct cat_desc *cdp);
 465
 466 extern int hfs_namecmp(const char *, size_t, const char *, size_t);
 467
 468 extern int  hfs_virtualmetafile(struct cnode *);
 469
 470 void hfs_generate_volume_notifications(struct hfsmount *hfsmp);
 471
 472 __private_extern__ u_int32_t hfs_getencodingbias(void);
 473 __private_extern__ void hfs_setencodingbias(u_int32_t bias);
 474
 475 extern int hfs_vgetrsrc(struct hfsmount *hfsmp, struct vnode *vp,
 476                         struct vnode **rvpp, struct proc *p);
 477
 478 extern int hfs_update(struct vnode *, int);
 479
 480 extern int hfs_truncate(struct vnode *, off_t, int, int, vfs_context_t);
 481
 482 extern int hfs_fsync(struct vnode *, int, int, struct proc *);
 483
 484 extern int hfs_access(struct vnode *, mode_t, struct ucred *, struct proc *);
 485
 486 extern int hfs_vget(struct hfsmount *, cnid_t, struct vnode **, int);
 487
 488 extern int hfs_bmap(struct vnode *, daddr_t, struct vnode **, daddr64_t *, int *);
 489
 490 extern int hfs_removeallattr(struct hfsmount *hfsmp, u_int32_t fileid);
 491
 492 __private_extern__ int hfs_start_transaction(struct hfsmount *hfsmp);
 493 __private_extern__ int hfs_end_transaction(struct hfsmount *hfsmp);
 494
 495 extern int  hfs_setextendedsecurity(struct hfsmount *hfsmp, int state);
 496 extern void hfs_checkextendedsecurity(struct hfsmount *hfsmp);
 497
 498 extern int  hfs_extendfs(struct hfsmount *, u_int64_t, vfs_context_t);
 499 extern int  hfs_truncatefs(struct hfsmount *, u_int64_t, vfs_context_t);
 500
 501 extern int  hfs_isallocated(struct hfsmount *, u_long, u_long);
 502
 503
 504 /* HFS System file locking */
 505 #define SFL_CATALOG     0x0001
 506 #define SFL_EXTENTS     0x0002
 507 #define SFL_BITMAP      0x0004
 508 #define SFL_ATTRIBUTE   0x0008
 509 #define SFL_VALIDMASK   (SFL_CATALOG | SFL_EXTENTS | SFL_BITMAP | SFL_ATTRIBUTE)
 510
 511 extern int  hfs_systemfile_lock(struct hfsmount *, int, enum hfslocktype);
 512 extern void hfs_systemfile_unlock(struct hfsmount *, int);
 513
 514 #endif /* __APPLE_API_PRIVATE */
 515 #endif /* KERNEL */
 516 #endif /* __HFS__ */