bsd/hfs/hfs.h

   1 /*
   2  * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 #ifndef __HFS__
  24 #define __HFS__
  25
  26 #define HFS_SPARSE_DEV 1
  27
  28 #include <sys/appleapiopts.h>
  29
  30 #ifdef KERNEL
  31 #ifdef __APPLE_API_PRIVATE
  32 #include <sys/param.h>
  33 #include <sys/queue.h>
  34 #include <sys/mount.h>
  35 #include <sys/vnode.h>
  36 #include <sys/quota.h>
  37 #include <sys/dirent.h>
  38 #include <sys/event.h>
  39
  40 #include <kern/locks.h>
  41
  42 #include <vfs/vfs_journal.h>
  43
  44 #include <hfs/hfs_format.h>
  45 #include <hfs/hfs_catalog.h>
  46 #include <hfs/hfs_cnode.h>
  47 #include <hfs/hfs_macos_defs.h>
  48 #include <hfs/hfs_encodings.h>
  49 #include <hfs/hfs_hotfiles.h>
  50
  51 /*
  52  *      Just reported via MIG interface.
  53  */
  54 #define VERSION_STRING  "hfs-2 (4-12-99)"
  55
  56 #define HFS_LINK_MAX    32767
  57
  58 #define HFS_MAX_DEFERED_ALLOC   (1024*1024)
  59
  60 // 32 gigs is a "big" file (i.e. one that when deleted
  61 // would touch enough data that we should break it into
  62 // multiple separate transactions
  63 #define HFS_BIGFILE_SIZE (32LL * 1024LL * 1024LL * 1024LL)
  64
  65
  66 enum { kMDBSize = 512 };                                /* Size of I/O transfer to read entire MDB */
  67
  68 enum { kMasterDirectoryBlock = 2 };                     /* MDB offset on disk in 512-byte blocks */
  69 enum { kMDBOffset = kMasterDirectoryBlock * 512 };      /* MDB offset on disk in bytes */
  70
  71 #define kRootDirID kHFSRootFolderID
  72
  73
  74 /* number of locked buffer caches to hold for b-tree meta data */
  75 #define kMaxLockedMetaBuffers           32
  76
  77 /*
  78  *      File type and creator for symbolic links
  79  */
  80 enum {
  81         kSymLinkFileType  = 0x736C6E6B, /* 'slnk' */
  82         kSymLinkCreator   = 0x72686170  /* 'rhap' */
  83 };
  84
  85
  86 extern struct timezone gTimeZone;
  87
  88
  89 /* How many free extents to cache per volume */
  90 #define kMaxFreeExtents         10
  91
  92 /*
  93  * HFS_MINFREE gives the minimum acceptable percentage
  94  * of file system blocks which may be free (but this
  95  * minimum will never exceed HFS_MAXRESERVE bytes). If
  96  * the free block count drops below this level only the
  97  * superuser may continue to allocate blocks.
  98  */
  99 #define HFS_MINFREE             1
 100 #define HFS_MAXRESERVE          ((u_int64_t)(250*1024*1024))
 101
 102 /*
 103  * The system distinguishes between the desirable low-disk
 104  * notifiaction levels for root volumes and non-root volumes.
 105  * The various thresholds are computed as a fraction of the
 106  * volume size, all capped at a certain fixed level
 107  */
 108
 109 #define HFS_ROOTLOWDISKTRIGGERFRACTION 5
 110 #define HFS_ROOTLOWDISKTRIGGERLEVEL ((u_int64_t)(250*1024*1024))
 111 #define HFS_ROOTLOWDISKSHUTOFFFRACTION 6
 112 #define HFS_ROOTLOWDISKSHUTOFFLEVEL ((u_int64_t)(375*1024*1024))
 113
 114 #define HFS_LOWDISKTRIGGERFRACTION 1
 115 #define HFS_LOWDISKTRIGGERLEVEL ((u_int64_t)(50*1024*1024))
 116 #define HFS_LOWDISKSHUTOFFFRACTION 2
 117 #define HFS_LOWDISKSHUTOFFLEVEL ((u_int64_t)(75*1024*1024))
 118
 119 /* Internal Data structures*/
 120
 121
 122 #define kHFS_DamagedVolume  0x1 /* This volume has errors, unmount dirty */
 123
 124 /* XXX */
 125 #define MARK_VOLUMEDAMAGED(fcb)
 126
 127
 128 /* This structure describes the HFS specific mount structure data. */
 129 typedef struct hfsmount {
 130         u_int32_t     hfs_flags;              /* see below */
 131
 132         /* Physical Description */
 133         u_long        hfs_phys_block_size;    /* Always a multiple of 512 */
 134         daddr64_t     hfs_phys_block_count;   /* Num of PHYSICAL blocks of volume */
 135         daddr64_t     hfs_alt_id_sector;      /* location of alternate VH/MDB */
 136
 137         /* Access to VFS and devices */
 138         struct mount            *hfs_mp;                                /* filesystem vfs structure */
 139         struct vnode            *hfs_devvp;                             /* block device mounted vnode */
 140         struct vnode *          hfs_extents_vp;
 141         struct vnode *          hfs_catalog_vp;
 142         struct vnode *          hfs_allocation_vp;
 143         struct vnode *          hfs_attribute_vp;
 144         dev_t                   hfs_raw_dev;                    /* device mounted */
 145         u_int32_t               hfs_logBlockSize;               /* Size of buffer cache buffer for I/O */
 146
 147         /* Default values for HFS standard and non-init access */
 148         uid_t         hfs_uid;            /* uid to set as owner of the files */
 149         gid_t         hfs_gid;            /* gid to set as owner of the files */
 150         mode_t        hfs_dir_mask;       /* mask to and with directory protection bits */
 151         mode_t        hfs_file_mask;      /* mask to and with file protection bits */
 152         u_long        hfs_encoding;       /* Defualt encoding for non hfs+ volumes */
 153
 154         /* Persistent fields (on disk, dynamic) */
 155         time_t        hfs_mtime;          /* file system last modification time */
 156         u_int32_t     hfs_filecount;      /* number of files in file system */
 157         u_int32_t     hfs_dircount;       /* number of directories in file system */
 158         u_int32_t     freeBlocks;         /* free allocation blocks */
 159         u_int32_t     nextAllocation;     /* start of next allocation search */
 160         u_int32_t     vcbNxtCNID;         /* next unused catalog node ID */
 161         u_int32_t     vcbWrCnt;           /* file system write count */
 162         u_int64_t     encodingsBitmap;    /* in-use encodings */
 163         u_int16_t     vcbNmFls;           /* HFS Only - root dir file count */
 164         u_int16_t     vcbNmRtDirs;        /* HFS Only - root dir directory count */
 165
 166         /* Persistent fields (on disk, static) */
 167         u_int16_t                       vcbSigWord;
 168         int16_t                         vcbFlags;
 169         u_int32_t                       vcbAtrb;
 170         u_int32_t                       vcbJinfoBlock;
 171         time_t        hfs_itime;   /* file system creation time */
 172         time_t        hfs_btime;   /* file system last backup time */
 173         u_int32_t                       blockSize;      /* size of allocation blocks */
 174         u_int32_t                       totalBlocks;    /* total allocation blocks */
 175         int32_t                         vcbClpSiz;
 176         u_int32_t     vcbFndrInfo[8];
 177         int16_t                         vcbVBMSt;               /* HFS only */
 178         int16_t                         vcbAlBlSt;              /* HFS only */
 179
 180         /* vcb stuff */
 181         u_int8_t                        vcbVN[256];             /* volume name in UTF-8 */
 182         u_int32_t                       volumeNameEncodingHint;
 183         u_int32_t                       hfsPlusIOPosOffset;     /* Disk block where HFS+ starts */
 184         u_int32_t                       vcbVBMIOSize;           /* volume bitmap I/O size */
 185
 186         /* cache of largest known free extents */
 187         u_int32_t                       vcbFreeExtCnt;
 188         HFSPlusExtentDescriptor vcbFreeExt[kMaxFreeExtents];
 189
 190         u_int32_t               reserveBlocks;          /* free block reserve */
 191         u_int32_t               loanedBlocks;           /* blocks on loan for delayed allocations */
 192
 193         u_int32_t                       localCreateDate;        /* creation times for HFS+ volumes are in local time */
 194         struct cat_desc         hfs_privdir_desc;
 195         struct cat_attr         hfs_privdir_attr;
 196         u_int32_t               hfs_metadata_createdate;
 197         hfs_to_unicode_func_t   hfs_get_unicode;
 198         unicode_to_hfs_func_t   hfs_get_hfsname;
 199
 200         /* Quota variables: */
 201         struct quotafile        hfs_qfiles[MAXQUOTAS];    /* quota files */
 202
 203         /* Journaling variables: */
 204         void                *jnl;           // the journal for this volume (if one exists)
 205         struct vnode        *jvp;           // device where the journal lives (may be equal to devvp)
 206         u_int32_t            jnl_start;     // start block of the journal file (so we don't delete it)
 207         u_int32_t            jnl_size;
 208         u_int32_t            hfs_jnlfileid;
 209         u_int32_t            hfs_jnlinfoblkid;
 210         lck_rw_t             hfs_global_lock;
 211         u_int32_t            hfs_global_lock_nesting;
 212
 213         /* Notification variables: */
 214         unsigned long           hfs_notification_conditions;
 215         u_int32_t               hfs_freespace_notify_warninglimit;
 216         u_int32_t               hfs_freespace_notify_desiredlevel;
 217
 218         /* time mounted and last mounted mod time "snapshot" */
 219         time_t          hfs_mount_time;
 220         time_t          hfs_last_mounted_mtime;
 221
 222         /* Metadata allocation zone variables: */
 223         u_int32_t       hfs_metazone_start;
 224         u_int32_t       hfs_metazone_end;
 225         u_int32_t       hfs_hotfile_start;
 226         u_int32_t       hfs_hotfile_end;
 227         int             hfs_hotfile_freeblks;
 228         int             hfs_hotfile_maxblks;
 229         int             hfs_overflow_maxblks;
 230         int             hfs_catalog_maxblks;
 231
 232         /* Hot File Clustering variables: */
 233         lck_mtx_t       hfc_mutex;      /* serialize hot file stages */
 234         enum hfc_stage  hfc_stage;      /* what are we up to... */
 235         time_t          hfc_timebase;   /* recording period start time */
 236         time_t          hfc_timeout;    /* recording period stop time */
 237         void *          hfc_recdata;    /* recording data (opaque) */
 238         int             hfc_maxfiles;   /* maximum files to track */
 239         struct vnode *  hfc_filevp;
 240
 241 #ifdef HFS_SPARSE_DEV
 242         /* Sparse device variables: */
 243         struct vnode * hfs_backingfs_rootvp;
 244         int            hfs_sparsebandblks;
 245 #endif
 246         size_t         hfs_max_inline_attrsize;
 247
 248         lck_mtx_t      hfs_mutex;      /* protects access to hfsmount data */
 249         void          *hfs_freezing_proc;  /* who froze the fs */
 250 } hfsmount_t;
 251
 252 typedef hfsmount_t  ExtendedVCB;
 253
 254 /* Aliases for legacy field names */
 255 #define vcbCrDate          hfs_itime
 256 #define vcbLsMod           hfs_mtime
 257 #define vcbVolBkUp         hfs_btime
 258 #define extentsRefNum      hfs_extents_vp
 259 #define catalogRefNum      hfs_catalog_vp
 260 #define allocationsRefNum  hfs_allocation_vp
 261 #define vcbFilCnt          hfs_filecount
 262 #define vcbDirCnt          hfs_dircount
 263
 264
 265 /* HFS mount point flags */
 266 #define HFS_READ_ONLY             0x001
 267 #define HFS_UNKNOWN_PERMS         0x002
 268 #define HFS_WRITEABLE_MEDIA       0x004
 269 #define HFS_CLEANED_ORPHANS       0x008
 270 #define HFS_X                     0x010
 271 #define HFS_CASE_SENSITIVE        0x020
 272 #define HFS_STANDARD              0x040
 273 #define HFS_METADATA_ZONE         0x080
 274 #define HFS_FRAGMENTED_FREESPACE  0x100
 275 #define HFS_NEED_JNL_RESET        0x200
 276 #define HFS_HAS_SPARSE_DEVICE     0x400
 277
 278
 279 #define HFS_MOUNT_LOCK(hfsmp, metadata)                      \
 280         {                                                    \
 281                 if ((metadata) && 1)                         \
 282                         lck_mtx_lock(&(hfsmp)->hfs_mutex);   \
 283         }                                                    \
 284
 285 #define HFS_MOUNT_UNLOCK(hfsmp, metadata)                    \
 286         {                                                    \
 287                 if ((metadata) && 1)                         \
 288                         lck_mtx_unlock(&(hfsmp)->hfs_mutex); \
 289         }                                                    \
 290
 291 #define hfs_global_exclusive_lock_acquire(hfsmp) lck_rw_lock_exclusive(&(hfsmp)->hfs_global_lock)
 292 #define hfs_global_exclusive_lock_release(hfsmp) lck_rw_done(&(hfsmp)->hfs_global_lock)
 293
 294
 295 #define MAXHFSVNODELEN          31
 296
 297
 298 typedef struct filefork FCB;
 299
 300
 301 #define MAKE_INODE_NAME(name,linkno) \
 302             (void) sprintf((name), "%s%d", HFS_INODE_PREFIX, (linkno))
 303
 304
 305
 306 #define HFS_AVERAGE_NAME_SIZE   22
 307 #define AVERAGE_HFSDIRENTRY_SIZE  (8+HFS_AVERAGE_NAME_SIZE+4)
 308
 309 #define STD_DIRENT_LEN(namlen) \
 310         ((sizeof(struct dirent) - (NAME_MAX+1)) + (((namlen)+1 + 3) &~ 3))
 311
 312 #define EXT_DIRENT_LEN(namlen) \
 313         ((sizeof(struct direntry) + (namlen) - (MAXPATHLEN-1) + 3) & ~3)
 314
 315
 316 enum { kHFSPlusMaxFileNameBytes = kHFSPlusMaxFileNameChars * 3 };
 317
 318
 319 /* macro to determine if hfs or hfsplus */
 320 #define ISHFSPLUS(VCB) ((VCB)->vcbSigWord == kHFSPlusSigWord)
 321 #define ISHFS(VCB) ((VCB)->vcbSigWord == kHFSSigWord)
 322
 323
 324 /*
 325  * Various ways to acquire a VFS mount point pointer:
 326  */
 327 #define VTOVFS(VP)  vnode_mount((VP))
 328 #define HFSTOVFS(HFSMP) ((HFSMP)->hfs_mp)
 329 #define VCBTOVFS(VCB)   HFSTOVFS(VCB)
 330
 331 /*
 332  * Various ways to acquire an HFS mount point pointer:
 333  */
 334 #define VTOHFS(VP)  ((struct hfsmount *)vfs_fsprivate(vnode_mount((VP))))
 335 #define VFSTOHFS(MP)  ((struct hfsmount *)vfs_fsprivate((MP)))
 336 #define VCBTOHFS(VCB) (VCB)
 337 #define FCBTOHFS(FCB)  ((struct hfsmount *)vfs_fsprivate(vnode_mount((FCB)->ff_cp->c_vp)))
 338
 339 /*
 340  * Various ways to acquire a VCB (legacy) pointer:
 341  */
 342 #define VTOVCB(VP)       VTOHFS(VP)
 343 #define VFSTOVCB(MP)     VFSTOHFS(MP)
 344 #define HFSTOVCB(HFSMP)  (HFSMP)
 345 #define FCBTOVCB(FCB)    FCBTOHFS(FCB)
 346
 347
 348 #define HFS_KNOTE(vp, hint) KNOTE(&VTOC(vp)->c_knotes, (hint))
 349
 350
 351 #define E_NONE  0
 352 #define kHFSBlockSize 512
 353
 354 /*
 355  * Macros for getting the MDB/VH sector and offset
 356  */
 357 #define HFS_PRI_SECTOR(blksize)          (1024 / (blksize))
 358 #define HFS_PRI_OFFSET(blksize)          ((blksize) > 1024 ? 1024 : 0)
 359
 360 #define HFS_ALT_SECTOR(blksize, blkcnt)  (((blkcnt) - 1) - (512 / (blksize)))
 361 #define HFS_ALT_OFFSET(blksize)          ((blksize) > 1024 ? (blksize) - 1024 : 0)
 362
 363
 364 /*
 365  * HFS specific fcntl()'s
 366  */
 367 #define HFS_BULKACCESS      (FCNTL_FS_SPECIFIC_BASE + 0x00001)
 368 #define HFS_GET_MOUNT_TIME  (FCNTL_FS_SPECIFIC_BASE + 0x00002)
 369 #define HFS_GET_LAST_MTIME  (FCNTL_FS_SPECIFIC_BASE + 0x00003)
 370 #define HFS_GET_BOOT_INFO   (FCNTL_FS_SPECIFIC_BASE + 0x00004)
 371 #define HFS_SET_BOOT_INFO   (FCNTL_FS_SPECIFIC_BASE + 0x00005)
 372
 373
 374 /*
 375  *      This is the straight GMT conversion constant:
 376  *      00:00:00 January 1, 1970 - 00:00:00 January 1, 1904
 377  *      (3600 * 24 * ((365 * (1970 - 1904)) + (((1970 - 1904) / 4) + 1)))
 378  */
 379 #define MAC_GMT_FACTOR          2082844800UL
 380
 381
 382 time_t to_bsd_time(u_int32_t hfs_time);
 383 u_int32_t to_hfs_time(time_t bsd_time);
 384
 385 int hfs_flushvolumeheader(struct hfsmount *hfsmp, int waitfor, int altflush);
 386 #define HFS_ALTFLUSH    1
 387
 388 extern int hfsUnmount(struct hfsmount *hfsmp, struct proc *p);
 389
 390 extern int hfs_getnewvnode(struct hfsmount *hfsmp, struct vnode *dvp, struct componentname *cnp,
 391                            struct cat_desc *descp, int wantrsrc, struct cat_attr *attrp,
 392                            struct cat_fork *forkp, struct vnode **vpp);
 393
 394 extern u_int32_t hfs_freeblks(struct hfsmount * hfsmp, int wantreserve);
 395
 396 extern void hfs_remove_orphans(struct hfsmount *);
 397
 398
 399 short MacToVFSError(OSErr err);
 400
 401 extern int hfs_owner_rights(struct hfsmount *hfsmp, uid_t cnode_uid, struct ucred *cred,
 402                 struct proc *p, int invokesuperuserstatus);
 403
 404 u_long FindMetaDataDirectory(ExtendedVCB *vcb);
 405
 406 #define  kMaxSecsForFsync       5
 407 #define  HFS_SYNCTRANS          1
 408
 409 extern int hfs_btsync(struct vnode *vp, int sync_transaction);
 410 // used as a callback by the journaling code
 411 extern void hfs_sync_metadata(void *arg);
 412
 413 short make_dir_entry(FCB **fileptr, char *name, u_int32_t fileID);
 414
 415
 416 unsigned long BestBlockSizeFit(unsigned long allocationBlockSize,
 417                                unsigned long blockSizeLimit,
 418                                unsigned long baseMultiple);
 419
 420 OSErr   hfs_MountHFSVolume(struct hfsmount *hfsmp, HFSMasterDirectoryBlock *mdb,
 421                 struct proc *p);
 422 OSErr   hfs_MountHFSPlusVolume(struct hfsmount *hfsmp, HFSPlusVolumeHeader *vhp,
 423                 off_t embeddedOffset, u_int64_t disksize, struct proc *p, void *args, kauth_cred_t cred);
 424
 425 extern int     hfs_early_journal_init(struct hfsmount *hfsmp, HFSPlusVolumeHeader *vhp,
 426                                                            void *_args, off_t embeddedOffset, daddr64_t mdb_offset,
 427                                                            HFSMasterDirectoryBlock *mdbp, struct ucred *cred);
 428 extern u_long  GetFileInfo(ExtendedVCB *vcb, u_int32_t dirid, const char *name,
 429                                                    struct cat_attr *fattr, struct cat_fork *forkinfo);
 430
 431 int hfs_getconverter(u_int32_t encoding, hfs_to_unicode_func_t *get_unicode,
 432                      unicode_to_hfs_func_t *get_hfsname);
 433
 434 int hfs_relconverter(u_int32_t encoding);
 435
 436 int hfs_to_utf8(ExtendedVCB *vcb, Str31 hfs_str, ByteCount maxDstLen,
 437                 ByteCount *actualDstLen, unsigned char* dstStr);
 438
 439 int utf8_to_hfs(ExtendedVCB *vcb, ByteCount srcLen, const unsigned char* srcStr,
 440                 Str31 dstStr);
 441
 442 int mac_roman_to_utf8(Str31 hfs_str, ByteCount maxDstLen, ByteCount *actualDstLen,
 443                 unsigned char* dstStr);
 444
 445 int utf8_to_mac_roman(ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr);
 446
 447 u_int32_t hfs_pickencoding(const u_int16_t *src, int len);
 448
 449 enum volop {VOL_UPDATE, VOL_MKDIR, VOL_RMDIR, VOL_MKFILE, VOL_RMFILE};
 450
 451 extern int hfs_volupdate(struct hfsmount *hfsmp, enum volop op, int inroot);
 452
 453 extern void hfs_setencodingbits(struct hfsmount *hfsmp, u_int32_t encoding);
 454
 455
 456 extern void replace_desc(struct cnode *cp, struct cat_desc *cdp);
 457
 458 extern int hfs_namecmp(const char *, size_t, const char *, size_t);
 459
 460 extern int  hfs_virtualmetafile(struct cnode *);
 461
 462 void hfs_generate_volume_notifications(struct hfsmount *hfsmp);
 463
 464 __private_extern__ u_int32_t hfs_getencodingbias(void);
 465 __private_extern__ void hfs_setencodingbias(u_int32_t bias);
 466
 467 extern int hfs_vgetrsrc(struct hfsmount *hfsmp, struct vnode *vp,
 468                         struct vnode **rvpp, struct proc *p);
 469
 470 extern int hfs_update(struct vnode *, int);
 471
 472 extern int hfs_truncate(struct vnode *, off_t, int, int, vfs_context_t);
 473
 474 extern int hfs_fsync(struct vnode *, int, int, struct proc *);
 475
 476 extern int hfs_access(struct vnode *, mode_t, struct ucred *, struct proc *);
 477
 478 extern int hfs_vget(struct hfsmount *, cnid_t, struct vnode **, int);
 479
 480 extern int hfs_bmap(struct vnode *, daddr_t, struct vnode **, daddr64_t *, int *);
 481
 482 extern int hfs_removeallattr(struct hfsmount *hfsmp, u_int32_t fileid);
 483
 484 __private_extern__ int hfs_start_transaction(struct hfsmount *hfsmp);
 485 __private_extern__ int hfs_end_transaction(struct hfsmount *hfsmp);
 486
 487 extern int  hfs_setextendedsecurity(struct hfsmount *hfsmp, int state);
 488 extern void hfs_checkextendedsecurity(struct hfsmount *hfsmp);
 489
 490 extern int  hfs_extendfs(struct hfsmount *, u_int64_t, vfs_context_t);
 491 extern int  hfs_truncatefs(struct hfsmount *, u_int64_t, vfs_context_t);
 492
 493 extern int  hfs_isallocated(struct hfsmount *, u_long, u_long);
 494
 495
 496 /* HFS System file locking */
 497 #define SFL_CATALOG     0x0001
 498 #define SFL_EXTENTS     0x0002
 499 #define SFL_BITMAP      0x0004
 500 #define SFL_ATTRIBUTE   0x0008
 501 #define SFL_VALIDMASK   (SFL_CATALOG | SFL_EXTENTS | SFL_BITMAP | SFL_ATTRIBUTE)
 502
 503 extern int  hfs_systemfile_lock(struct hfsmount *, int, enum hfslocktype);
 504 extern void hfs_systemfile_unlock(struct hfsmount *, int);
 505
 506 #endif /* __APPLE_API_PRIVATE */
 507 #endif /* KERNEL */
 508 #endif /* __HFS__ */