bsd/hfs/hfs.h

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30
  31 #ifndef __HFS__
  32 #define __HFS__
  33
  34 #define HFS_SPARSE_DEV 1
  35
  36 #include <sys/appleapiopts.h>
  37
  38 #ifdef KERNEL
  39 #ifdef __APPLE_API_PRIVATE
  40 #include <sys/param.h>
  41 #include <sys/queue.h>
  42 #include <sys/mount.h>
  43 #include <sys/vnode.h>
  44 #include <sys/quota.h>
  45 #include <sys/dirent.h>
  46 #include <sys/event.h>
  47
  48 #include <kern/locks.h>
  49
  50 #include <vfs/vfs_journal.h>
  51
  52 #include <hfs/hfs_format.h>
  53 #include <hfs/hfs_catalog.h>
  54 #include <hfs/hfs_cnode.h>
  55 #include <hfs/hfs_macos_defs.h>
  56 #include <hfs/hfs_encodings.h>
  57 #include <hfs/hfs_hotfiles.h>
  58
  59 /*
  60  *      Just reported via MIG interface.
  61  */
  62 #define VERSION_STRING  "hfs-2 (4-12-99)"
  63
  64 #define HFS_LINK_MAX    32767
  65
  66 #define HFS_MAX_DEFERED_ALLOC   (1024*1024)
  67
  68 // 32 gigs is a "big" file (i.e. one that when deleted
  69 // would touch enough data that we should break it into
  70 // multiple separate transactions
  71 #define HFS_BIGFILE_SIZE (32LL * 1024LL * 1024LL * 1024LL)
  72
  73
  74 enum { kMDBSize = 512 };                                /* Size of I/O transfer to read entire MDB */
  75
  76 enum { kMasterDirectoryBlock = 2 };                     /* MDB offset on disk in 512-byte blocks */
  77 enum { kMDBOffset = kMasterDirectoryBlock * 512 };      /* MDB offset on disk in bytes */
  78
  79 #define kRootDirID kHFSRootFolderID
  80
  81
  82 /* number of locked buffer caches to hold for b-tree meta data */
  83 #define kMaxLockedMetaBuffers           32
  84
  85 /*
  86  *      File type and creator for symbolic links
  87  */
  88 enum {
  89         kSymLinkFileType  = 0x736C6E6B, /* 'slnk' */
  90         kSymLinkCreator   = 0x72686170  /* 'rhap' */
  91 };
  92
  93
  94 extern struct timezone gTimeZone;
  95
  96
  97 /* How many free extents to cache per volume */
  98 #define kMaxFreeExtents         10
  99
 100 /*
 101  * HFS_MINFREE gives the minimum acceptable percentage
 102  * of file system blocks which may be free (but this
 103  * minimum will never exceed HFS_MAXRESERVE bytes). If
 104  * the free block count drops below this level only the
 105  * superuser may continue to allocate blocks.
 106  */
 107 #define HFS_MINFREE             1
 108 #define HFS_MAXRESERVE          ((u_int64_t)(250*1024*1024))
 109
 110 /*
 111  * The system distinguishes between the desirable low-disk
 112  * notifiaction levels for root volumes and non-root volumes.
 113  * The various thresholds are computed as a fraction of the
 114  * volume size, all capped at a certain fixed level
 115  */
 116
 117 #define HFS_ROOTLOWDISKTRIGGERFRACTION 5
 118 #define HFS_ROOTLOWDISKTRIGGERLEVEL ((u_int64_t)(250*1024*1024))
 119 #define HFS_ROOTLOWDISKSHUTOFFFRACTION 6
 120 #define HFS_ROOTLOWDISKSHUTOFFLEVEL ((u_int64_t)(375*1024*1024))
 121
 122 #define HFS_LOWDISKTRIGGERFRACTION 1
 123 #define HFS_LOWDISKTRIGGERLEVEL ((u_int64_t)(50*1024*1024))
 124 #define HFS_LOWDISKSHUTOFFFRACTION 2
 125 #define HFS_LOWDISKSHUTOFFLEVEL ((u_int64_t)(75*1024*1024))
 126
 127 /* Internal Data structures*/
 128
 129
 130 #define kHFS_DamagedVolume  0x1 /* This volume has errors, unmount dirty */
 131
 132 /* XXX */
 133 #define MARK_VOLUMEDAMAGED(fcb)
 134
 135
 136 /* This structure describes the HFS specific mount structure data. */
 137 typedef struct hfsmount {
 138         u_int32_t     hfs_flags;              /* see below */
 139
 140         /* Physical Description */
 141         u_long        hfs_phys_block_size;    /* Always a multiple of 512 */
 142         daddr64_t     hfs_phys_block_count;   /* Num of PHYSICAL blocks of volume */
 143         daddr64_t     hfs_alt_id_sector;      /* location of alternate VH/MDB */
 144
 145         /* Access to VFS and devices */
 146         struct mount            *hfs_mp;                                /* filesystem vfs structure */
 147         struct vnode            *hfs_devvp;                             /* block device mounted vnode */
 148         struct vnode *          hfs_extents_vp;
 149         struct vnode *          hfs_catalog_vp;
 150         struct vnode *          hfs_allocation_vp;
 151         struct vnode *          hfs_attribute_vp;
 152         dev_t                   hfs_raw_dev;                    /* device mounted */
 153         u_int32_t               hfs_logBlockSize;               /* Size of buffer cache buffer for I/O */
 154
 155         /* Default values for HFS standard and non-init access */
 156         uid_t         hfs_uid;            /* uid to set as owner of the files */
 157         gid_t         hfs_gid;            /* gid to set as owner of the files */
 158         mode_t        hfs_dir_mask;       /* mask to and with directory protection bits */
 159         mode_t        hfs_file_mask;      /* mask to and with file protection bits */
 160         u_long        hfs_encoding;       /* Defualt encoding for non hfs+ volumes */
 161
 162         /* Persistent fields (on disk, dynamic) */
 163         time_t        hfs_mtime;          /* file system last modification time */
 164         u_int32_t     hfs_filecount;      /* number of files in file system */
 165         u_int32_t     hfs_dircount;       /* number of directories in file system */
 166         u_int32_t     freeBlocks;         /* free allocation blocks */
 167         u_int32_t     nextAllocation;     /* start of next allocation search */
 168         u_int32_t     vcbNxtCNID;         /* next unused catalog node ID */
 169         u_int32_t     vcbWrCnt;           /* file system write count */
 170         u_int64_t     encodingsBitmap;    /* in-use encodings */
 171         u_int16_t     vcbNmFls;           /* HFS Only - root dir file count */
 172         u_int16_t     vcbNmRtDirs;        /* HFS Only - root dir directory count */
 173
 174         /* Persistent fields (on disk, static) */
 175         u_int16_t                       vcbSigWord;
 176         int16_t                         vcbFlags;
 177         u_int32_t                       vcbAtrb;
 178         u_int32_t                       vcbJinfoBlock;
 179         time_t        hfs_itime;   /* file system creation time */
 180         time_t        hfs_btime;   /* file system last backup time */
 181         u_int32_t                       blockSize;      /* size of allocation blocks */
 182         u_int32_t                       totalBlocks;    /* total allocation blocks */
 183         int32_t                         vcbClpSiz;
 184         u_int32_t     vcbFndrInfo[8];
 185         int16_t                         vcbVBMSt;               /* HFS only */
 186         int16_t                         vcbAlBlSt;              /* HFS only */
 187
 188         /* vcb stuff */
 189         u_int8_t                        vcbVN[256];             /* volume name in UTF-8 */
 190         u_int32_t                       volumeNameEncodingHint;
 191         u_int32_t                       hfsPlusIOPosOffset;     /* Disk block where HFS+ starts */
 192         u_int32_t                       vcbVBMIOSize;           /* volume bitmap I/O size */
 193
 194         /* cache of largest known free extents */
 195         u_int32_t                       vcbFreeExtCnt;
 196         HFSPlusExtentDescriptor vcbFreeExt[kMaxFreeExtents];
 197
 198         u_int32_t               reserveBlocks;          /* free block reserve */
 199         u_int32_t               loanedBlocks;           /* blocks on loan for delayed allocations */
 200
 201         u_int32_t                       localCreateDate;        /* creation times for HFS+ volumes are in local time */
 202         struct cat_desc         hfs_privdir_desc;
 203         struct cat_attr         hfs_privdir_attr;
 204         u_int32_t               hfs_metadata_createdate;
 205         hfs_to_unicode_func_t   hfs_get_unicode;
 206         unicode_to_hfs_func_t   hfs_get_hfsname;
 207
 208         /* Quota variables: */
 209         struct quotafile        hfs_qfiles[MAXQUOTAS];    /* quota files */
 210
 211         /* Journaling variables: */
 212         void                *jnl;           // the journal for this volume (if one exists)
 213         struct vnode        *jvp;           // device where the journal lives (may be equal to devvp)
 214         u_int32_t            jnl_start;     // start block of the journal file (so we don't delete it)
 215         u_int32_t            jnl_size;
 216         u_int32_t            hfs_jnlfileid;
 217         u_int32_t            hfs_jnlinfoblkid;
 218         lck_rw_t             hfs_global_lock;
 219         u_int32_t            hfs_global_lock_nesting;
 220
 221         /* Notification variables: */
 222         unsigned long           hfs_notification_conditions;
 223         u_int32_t               hfs_freespace_notify_warninglimit;
 224         u_int32_t               hfs_freespace_notify_desiredlevel;
 225
 226         /* time mounted and last mounted mod time "snapshot" */
 227         time_t          hfs_mount_time;
 228         time_t          hfs_last_mounted_mtime;
 229
 230         /* Metadata allocation zone variables: */
 231         u_int32_t       hfs_metazone_start;
 232         u_int32_t       hfs_metazone_end;
 233         u_int32_t       hfs_hotfile_start;
 234         u_int32_t       hfs_hotfile_end;
 235         int             hfs_hotfile_freeblks;
 236         int             hfs_hotfile_maxblks;
 237         int             hfs_overflow_maxblks;
 238         int             hfs_catalog_maxblks;
 239
 240         /* Hot File Clustering variables: */
 241         lck_mtx_t       hfc_mutex;      /* serialize hot file stages */
 242         enum hfc_stage  hfc_stage;      /* what are we up to... */
 243         time_t          hfc_timebase;   /* recording period start time */
 244         time_t          hfc_timeout;    /* recording period stop time */
 245         void *          hfc_recdata;    /* recording data (opaque) */
 246         int             hfc_maxfiles;   /* maximum files to track */
 247         struct vnode *  hfc_filevp;
 248
 249 #ifdef HFS_SPARSE_DEV
 250         /* Sparse device variables: */
 251         struct vnode * hfs_backingfs_rootvp;
 252         int            hfs_sparsebandblks;
 253 #endif
 254         size_t         hfs_max_inline_attrsize;
 255
 256         lck_mtx_t      hfs_mutex;      /* protects access to hfsmount data */
 257         void          *hfs_freezing_proc;  /* who froze the fs */
 258         lck_rw_t       hfs_insync;     /* protects sync/freeze interaction */
 259 } hfsmount_t;
 260
 261 typedef hfsmount_t  ExtendedVCB;
 262
 263 /* Aliases for legacy field names */
 264 #define vcbCrDate          hfs_itime
 265 #define vcbLsMod           hfs_mtime
 266 #define vcbVolBkUp         hfs_btime
 267 #define extentsRefNum      hfs_extents_vp
 268 #define catalogRefNum      hfs_catalog_vp
 269 #define allocationsRefNum  hfs_allocation_vp
 270 #define vcbFilCnt          hfs_filecount
 271 #define vcbDirCnt          hfs_dircount
 272
 273
 274 /* HFS mount point flags */
 275 #define HFS_READ_ONLY             0x001
 276 #define HFS_UNKNOWN_PERMS         0x002
 277 #define HFS_WRITEABLE_MEDIA       0x004
 278 #define HFS_CLEANED_ORPHANS       0x008
 279 #define HFS_X                     0x010
 280 #define HFS_CASE_SENSITIVE        0x020
 281 #define HFS_STANDARD              0x040
 282 #define HFS_METADATA_ZONE         0x080
 283 #define HFS_FRAGMENTED_FREESPACE  0x100
 284 #define HFS_NEED_JNL_RESET        0x200
 285 #define HFS_HAS_SPARSE_DEVICE     0x400
 286
 287
 288 #define HFS_MOUNT_LOCK(hfsmp, metadata)                      \
 289         {                                                    \
 290                 if ((metadata) && 1)                         \
 291                         lck_mtx_lock(&(hfsmp)->hfs_mutex);   \
 292         }                                                    \
 293
 294 #define HFS_MOUNT_UNLOCK(hfsmp, metadata)                    \
 295         {                                                    \
 296                 if ((metadata) && 1)                         \
 297                         lck_mtx_unlock(&(hfsmp)->hfs_mutex); \
 298         }                                                    \
 299
 300 #define hfs_global_exclusive_lock_acquire(hfsmp) lck_rw_lock_exclusive(&(hfsmp)->hfs_global_lock)
 301 #define hfs_global_exclusive_lock_release(hfsmp) lck_rw_done(&(hfsmp)->hfs_global_lock)
 302
 303
 304 #define MAXHFSVNODELEN          31
 305
 306
 307 typedef struct filefork FCB;
 308
 309
 310 #define MAKE_INODE_NAME(name,linkno) \
 311             (void) sprintf((name), "%s%d", HFS_INODE_PREFIX, (linkno))
 312
 313 #define HFS_INODE_PREFIX_LEN    5
 314
 315
 316 #define HFS_AVERAGE_NAME_SIZE   22
 317 #define AVERAGE_HFSDIRENTRY_SIZE  (8+HFS_AVERAGE_NAME_SIZE+4)
 318
 319 #define STD_DIRENT_LEN(namlen) \
 320         ((sizeof(struct dirent) - (NAME_MAX+1)) + (((namlen)+1 + 3) &~ 3))
 321
 322 #define EXT_DIRENT_LEN(namlen) \
 323         ((sizeof(struct direntry) + (namlen) - (MAXPATHLEN-1) + 3) & ~3)
 324
 325
 326 enum { kHFSPlusMaxFileNameBytes = kHFSPlusMaxFileNameChars * 3 };
 327
 328
 329 /* macro to determine if hfs or hfsplus */
 330 #define ISHFSPLUS(VCB) ((VCB)->vcbSigWord == kHFSPlusSigWord)
 331 #define ISHFS(VCB) ((VCB)->vcbSigWord == kHFSSigWord)
 332
 333
 334 /*
 335  * Various ways to acquire a VFS mount point pointer:
 336  */
 337 #define VTOVFS(VP)  vnode_mount((VP))
 338 #define HFSTOVFS(HFSMP) ((HFSMP)->hfs_mp)
 339 #define VCBTOVFS(VCB)   HFSTOVFS(VCB)
 340
 341 /*
 342  * Various ways to acquire an HFS mount point pointer:
 343  */
 344 #define VTOHFS(VP)  ((struct hfsmount *)vfs_fsprivate(vnode_mount((VP))))
 345 #define VFSTOHFS(MP)  ((struct hfsmount *)vfs_fsprivate((MP)))
 346 #define VCBTOHFS(VCB) (VCB)
 347 #define FCBTOHFS(FCB)  ((struct hfsmount *)vfs_fsprivate(vnode_mount((FCB)->ff_cp->c_vp)))
 348
 349 /*
 350  * Various ways to acquire a VCB (legacy) pointer:
 351  */
 352 #define VTOVCB(VP)       VTOHFS(VP)
 353 #define VFSTOVCB(MP)     VFSTOHFS(MP)
 354 #define HFSTOVCB(HFSMP)  (HFSMP)
 355 #define FCBTOVCB(FCB)    FCBTOHFS(FCB)
 356
 357
 358 #define HFS_KNOTE(vp, hint) KNOTE(&VTOC(vp)->c_knotes, (hint))
 359
 360
 361 #define E_NONE  0
 362 #define kHFSBlockSize 512
 363
 364 /*
 365  * Macros for getting the MDB/VH sector and offset
 366  */
 367 #define HFS_PRI_SECTOR(blksize)          (1024 / (blksize))
 368 #define HFS_PRI_OFFSET(blksize)          ((blksize) > 1024 ? 1024 : 0)
 369
 370 #define HFS_ALT_SECTOR(blksize, blkcnt)  (((blkcnt) - 1) - (512 / (blksize)))
 371 #define HFS_ALT_OFFSET(blksize)          ((blksize) > 1024 ? (blksize) - 1024 : 0)
 372
 373
 374 /*
 375  * HFS specific fcntl()'s
 376  */
 377 #define HFS_BULKACCESS      (FCNTL_FS_SPECIFIC_BASE + 0x00001)
 378 #define HFS_GET_MOUNT_TIME  (FCNTL_FS_SPECIFIC_BASE + 0x00002)
 379 #define HFS_GET_LAST_MTIME  (FCNTL_FS_SPECIFIC_BASE + 0x00003)
 380 #define HFS_GET_BOOT_INFO   (FCNTL_FS_SPECIFIC_BASE + 0x00004)
 381 #define HFS_SET_BOOT_INFO   (FCNTL_FS_SPECIFIC_BASE + 0x00005)
 382
 383
 384 /*
 385  *      This is the straight GMT conversion constant:
 386  *      00:00:00 January 1, 1970 - 00:00:00 January 1, 1904
 387  *      (3600 * 24 * ((365 * (1970 - 1904)) + (((1970 - 1904) / 4) + 1)))
 388  */
 389 #define MAC_GMT_FACTOR          2082844800UL
 390
 391
 392 time_t to_bsd_time(u_int32_t hfs_time);
 393 u_int32_t to_hfs_time(time_t bsd_time);
 394
 395 int hfs_flushvolumeheader(struct hfsmount *hfsmp, int waitfor, int altflush);
 396 #define HFS_ALTFLUSH    1
 397
 398 extern int hfsUnmount(struct hfsmount *hfsmp, struct proc *p);
 399
 400 extern int hfs_getnewvnode(struct hfsmount *hfsmp, struct vnode *dvp, struct componentname *cnp,
 401                            struct cat_desc *descp, int wantrsrc, struct cat_attr *attrp,
 402                            struct cat_fork *forkp, struct vnode **vpp);
 403
 404 extern u_int32_t hfs_freeblks(struct hfsmount * hfsmp, int wantreserve);
 405
 406 extern void hfs_remove_orphans(struct hfsmount *);
 407
 408
 409 short MacToVFSError(OSErr err);
 410
 411 extern int hfs_owner_rights(struct hfsmount *hfsmp, uid_t cnode_uid, struct ucred *cred,
 412                 struct proc *p, int invokesuperuserstatus);
 413
 414 u_long FindMetaDataDirectory(ExtendedVCB *vcb);
 415
 416 #define  kMaxSecsForFsync       5
 417 #define  HFS_SYNCTRANS          1
 418
 419 extern int hfs_btsync(struct vnode *vp, int sync_transaction);
 420 // used as a callback by the journaling code
 421 extern void hfs_sync_metadata(void *arg);
 422
 423 short make_dir_entry(FCB **fileptr, char *name, u_int32_t fileID);
 424
 425
 426 unsigned long BestBlockSizeFit(unsigned long allocationBlockSize,
 427                                unsigned long blockSizeLimit,
 428                                unsigned long baseMultiple);
 429
 430 OSErr   hfs_MountHFSVolume(struct hfsmount *hfsmp, HFSMasterDirectoryBlock *mdb,
 431                 struct proc *p);
 432 OSErr   hfs_MountHFSPlusVolume(struct hfsmount *hfsmp, HFSPlusVolumeHeader *vhp,
 433                 off_t embeddedOffset, u_int64_t disksize, struct proc *p, void *args, kauth_cred_t cred);
 434
 435 extern int     hfs_early_journal_init(struct hfsmount *hfsmp, HFSPlusVolumeHeader *vhp,
 436                                                            void *_args, off_t embeddedOffset, daddr64_t mdb_offset,
 437                                                            HFSMasterDirectoryBlock *mdbp, struct ucred *cred);
 438 extern u_long  GetFileInfo(ExtendedVCB *vcb, u_int32_t dirid, const char *name,
 439                                                    struct cat_attr *fattr, struct cat_fork *forkinfo);
 440
 441 int hfs_getconverter(u_int32_t encoding, hfs_to_unicode_func_t *get_unicode,
 442                      unicode_to_hfs_func_t *get_hfsname);
 443
 444 int hfs_relconverter(u_int32_t encoding);
 445
 446 int hfs_to_utf8(ExtendedVCB *vcb, Str31 hfs_str, ByteCount maxDstLen,
 447                 ByteCount *actualDstLen, unsigned char* dstStr);
 448
 449 int utf8_to_hfs(ExtendedVCB *vcb, ByteCount srcLen, const unsigned char* srcStr,
 450                 Str31 dstStr);
 451
 452 int mac_roman_to_utf8(Str31 hfs_str, ByteCount maxDstLen, ByteCount *actualDstLen,
 453                 unsigned char* dstStr);
 454
 455 int utf8_to_mac_roman(ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr);
 456
 457 u_int32_t hfs_pickencoding(const u_int16_t *src, int len);
 458
 459 enum volop {VOL_UPDATE, VOL_MKDIR, VOL_RMDIR, VOL_MKFILE, VOL_RMFILE};
 460
 461 extern int hfs_volupdate(struct hfsmount *hfsmp, enum volop op, int inroot);
 462
 463 extern void hfs_setencodingbits(struct hfsmount *hfsmp, u_int32_t encoding);
 464
 465
 466 extern void replace_desc(struct cnode *cp, struct cat_desc *cdp);
 467
 468 extern int hfs_namecmp(const char *, size_t, const char *, size_t);
 469
 470 extern int  hfs_virtualmetafile(struct cnode *);
 471
 472 void hfs_generate_volume_notifications(struct hfsmount *hfsmp);
 473
 474 __private_extern__ u_int32_t hfs_getencodingbias(void);
 475 __private_extern__ void hfs_setencodingbias(u_int32_t bias);
 476
 477 extern int hfs_vgetrsrc(struct hfsmount *hfsmp, struct vnode *vp,
 478                         struct vnode **rvpp, struct proc *p);
 479
 480 extern int hfs_update(struct vnode *, int);
 481
 482 extern int hfs_truncate(struct vnode *, off_t, int, int, vfs_context_t);
 483
 484 extern int hfs_fsync(struct vnode *, int, int, struct proc *);
 485
 486 extern int hfs_access(struct vnode *, mode_t, struct ucred *, struct proc *);
 487
 488 extern int hfs_vget(struct hfsmount *, cnid_t, struct vnode **, int);
 489
 490 extern int hfs_bmap(struct vnode *, daddr_t, struct vnode **, daddr64_t *, int *);
 491
 492 extern int hfs_removeallattr(struct hfsmount *hfsmp, u_int32_t fileid);
 493
 494 __private_extern__ int hfs_start_transaction(struct hfsmount *hfsmp);
 495 __private_extern__ int hfs_end_transaction(struct hfsmount *hfsmp);
 496
 497 extern int  hfs_setextendedsecurity(struct hfsmount *hfsmp, int state);
 498 extern void hfs_checkextendedsecurity(struct hfsmount *hfsmp);
 499
 500 extern int  hfs_extendfs(struct hfsmount *, u_int64_t, vfs_context_t);
 501 extern int  hfs_truncatefs(struct hfsmount *, u_int64_t, vfs_context_t);
 502
 503 extern int  hfs_isallocated(struct hfsmount *, u_long, u_long);
 504
 505
 506 /* HFS System file locking */
 507 #define SFL_CATALOG     0x0001
 508 #define SFL_EXTENTS     0x0002
 509 #define SFL_BITMAP      0x0004
 510 #define SFL_ATTRIBUTE   0x0008
 511 #define SFL_VALIDMASK   (SFL_CATALOG | SFL_EXTENTS | SFL_BITMAP | SFL_ATTRIBUTE)
 512
 513 extern int  hfs_systemfile_lock(struct hfsmount *, int, enum hfslocktype);
 514 extern void hfs_systemfile_unlock(struct hfsmount *, int);
 515
 516 #endif /* __APPLE_API_PRIVATE */
 517 #endif /* KERNEL */
 518 #endif /* __HFS__ */