bsd/hfs/hfs.h

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