code.delx.au - refind/blob - filesystems/fsw_core.h

   1 /* $Id: fsw_core.h 33540 2010-10-28 09:27:05Z vboxsync $ */
   2 /** @file
   3  * fsw_core.h - Core file system wrapper abstraction layer header.
   4  */
   5
   6 /*
   7  * Copyright (C) 2010 Oracle Corporation
   8  *
   9  * This file is part of VirtualBox Open Source Edition (OSE), as
  10  * available from http://www.virtualbox.org. This file is free software;
  11  * you can redistribute it and/or modify it under the terms of the GNU
  12  * General Public License (GPL) as published by the Free Software
  13  * Foundation, in version 2 as it comes in the "COPYING" file of the
  14  * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
  15  * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
  16  */
  17
  18 /*-
  19  * This code is based on:
  20  *
  21  * Copyright (c) 2006 Christoph Pfisterer
  22  * Portions Copyright (c) The Regents of the University of California.
  23  * Portions Copyright (c) UNIX System Laboratories, Inc.
  24  *
  25  * Redistribution and use in source and binary forms, with or without
  26  * modification, are permitted provided that the following conditions are
  27  * met:
  28  *
  29  *  * Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  *
  32  *  * Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the
  35  *    distribution.
  36  *
  37  *  * Neither the name of Christoph Pfisterer nor the names of the
  38  *    contributors may be used to endorse or promote products derived
  39  *    from this software without specific prior written permission.
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  42  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  43  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  44  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  45  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  46  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  47  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  48  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  49  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  50  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  51  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  52  */
  53
  54 #ifndef _FSW_CORE_H_
  55 #define _FSW_CORE_H_
  56
  57 #include "fsw_base.h"
  58
  59
  60 /** Maximum size for a path, specifically symlink target paths. */
  61 #ifndef VBOX
  62 #define FSW_PATH_MAX (4096)
  63 #else
  64 /* Too big allocations are handled with alloca() */
  65 #define FSW_PATH_MAX (2048)
  66 #endif
  67
  68 /** Helper macro for token concatenation. */
  69 #define FSW_CONCAT3(a,b,c) a##b##c
  70 /** Expands to the name of a fstype dispatch table (fsw_fstype_table) for a named file system type. */
  71 #define FSW_FSTYPE_TABLE_NAME(t) FSW_CONCAT3(fsw_,t,_table)
  72
  73 /** Indicates that the block cache entry is empty. */
  74 #define FSW_INVALID_BNO (~0UL)
  75
  76
  77 //
  78 // Byte-swapping macros
  79 //
  80
  81
  82 /**
  83  * \name Byte Order Macros
  84  * Implements big endian vs. little endian awareness and conversion.
  85  */
  86 /*@{*/
  87
  88 typedef fsw_u16             fsw_u16_le;
  89 typedef fsw_u16             fsw_u16_be;
  90 typedef fsw_u32             fsw_u32_le;
  91 typedef fsw_u32             fsw_u32_be;
  92 typedef fsw_u64             fsw_u64_le;
  93 typedef fsw_u64             fsw_u64_be;
  94
  95 #define FSW_SWAPVALUE_U16(v) ((((fsw_u16)(v) & 0xff00) >> 8) | \
  96                               (((fsw_u16)(v) & 0x00ff) << 8))
  97 #define FSW_SWAPVALUE_U32(v) ((((fsw_u32)(v) & 0xff000000UL) >> 24) | \
  98                               (((fsw_u32)(v) & 0x00ff0000UL) >> 8)  | \
  99                               (((fsw_u32)(v) & 0x0000ff00UL) << 8)  | \
 100                               (((fsw_u32)(v) & 0x000000ffUL) << 24))
 101 #define FSW_SWAPVALUE_U64(v) ((((fsw_u64)(v) & 0xff00000000000000ULL) >> 56) | \
 102                               (((fsw_u64)(v) & 0x00ff000000000000ULL) >> 40) | \
 103                               (((fsw_u64)(v) & 0x0000ff0000000000ULL) >> 24) | \
 104                               (((fsw_u64)(v) & 0x000000ff00000000ULL) >> 8)  | \
 105                               (((fsw_u64)(v) & 0x00000000ff000000ULL) << 8)  | \
 106                               (((fsw_u64)(v) & 0x0000000000ff0000ULL) << 24) | \
 107                               (((fsw_u64)(v) & 0x000000000000ff00ULL) << 40) | \
 108                               (((fsw_u64)(v) & 0x00000000000000ffULL) << 56))
 109
 110 #ifdef FSW_LITTLE_ENDIAN
 111
 112 #define fsw_u16_le_swap(v) (v)
 113 #define fsw_u16_be_swap(v) FSW_SWAPVALUE_U16(v)
 114 #define fsw_u32_le_swap(v) (v)
 115 #define fsw_u32_be_swap(v) FSW_SWAPVALUE_U32(v)
 116 #define fsw_u64_le_swap(v) (v)
 117 #define fsw_u64_be_swap(v) FSW_SWAPVALUE_U64(v)
 118
 119 #define fsw_u16_le_sip(var)
 120 #define fsw_u16_be_sip(var) (var = FSW_SWAPVALUE_U16(var))
 121 #define fsw_u32_le_sip(var)
 122 #define fsw_u32_be_sip(var) (var = FSW_SWAPVALUE_U32(var))
 123 #define fsw_u64_le_sip(var)
 124 #define fsw_u64_be_sip(var) (var = FSW_SWAPVALUE_U64(var))
 125
 126 #else
 127 #ifdef FSW_BIG_ENDIAN
 128
 129 #define fsw_u16_le_swap(v) FSW_SWAPVALUE_U16(v)
 130 #define fsw_u16_be_swap(v) (v)
 131 #define fsw_u32_le_swap(v) FSW_SWAPVALUE_U32(v)
 132 #define fsw_u32_be_swap(v) (v)
 133 #define fsw_u64_le_swap(v) FSW_SWAPVALUE_U64(v)
 134 #define fsw_u64_be_swap(v) (v)
 135
 136 #define fsw_u16_le_sip(var) (var = FSW_SWAPVALUE_U16(var))
 137 #define fsw_u16_be_sip(var)
 138 #define fsw_u32_le_sip(var) (var = FSW_SWAPVALUE_U32(var))
 139 #define fsw_u32_be_sip(var)
 140 #define fsw_u64_le_sip(var) (var = FSW_SWAPVALUE_U64(var))
 141 #define fsw_u64_be_sip(var)
 142
 143 #else
 144 #fail Neither FSW_BIG_ENDIAN nor FSW_LITTLE_ENDIAN are defined
 145 #endif
 146 #endif
 147
 148 /*@}*/
 149
 150
 151 //
 152 // The following evil hack avoids a lot of casts between generic and fstype-specific
 153 // structures.
 154 //
 155
 156 #ifndef VOLSTRUCTNAME
 157 #define VOLSTRUCTNAME fsw_volume
 158 #else
 159 struct VOLSTRUCTNAME;
 160 #endif
 161 #ifndef DNODESTRUCTNAME
 162 #define DNODESTRUCTNAME fsw_dnode
 163 #else
 164 struct DNODESTRUCTNAME;
 165 #endif
 166
 167
 168 /**
 169  * Status code type, returned from all functions that can fail.
 170  */
 171 typedef int fsw_status_t;
 172
 173 /**
 174  * Possible status codes.
 175  */
 176 enum {
 177     FSW_SUCCESS,
 178     FSW_OUT_OF_MEMORY,
 179     FSW_IO_ERROR,
 180     FSW_UNSUPPORTED,
 181     FSW_NOT_FOUND,
 182     FSW_VOLUME_CORRUPTED,
 183     FSW_UNKNOWN_ERROR
 184 };
 185
 186
 187 /**
 188  * Core: A string with explicit length and encoding information.
 189  */
 190
 191 struct fsw_string {
 192     int         type;               //!< Encoding of the string - empty, ISO-8859-1, UTF8, UTF16
 193     int         len;                //!< Length in characters
 194     int         size;               //!< Total data size in bytes
 195     void        *data;              //!< Data pointer (may be NULL if type is EMPTY or len is zero)
 196 };
 197
 198 /**
 199  * Possible string types / encodings. In the case of FSW_STRING_TYPE_EMPTY,
 200  * all other members of the fsw_string structure may be invalid.
 201  */
 202 enum {
 203     FSW_STRING_TYPE_EMPTY,
 204     FSW_STRING_TYPE_ISO88591,
 205     FSW_STRING_TYPE_UTF8,
 206     FSW_STRING_TYPE_UTF16,
 207     FSW_STRING_TYPE_UTF16_SWAPPED
 208 };
 209
 210 #ifdef FSW_LITTLE_ENDIAN
 211 #define FSW_STRING_TYPE_UTF16_LE FSW_STRING_TYPE_UTF16
 212 #define FSW_STRING_TYPE_UTF16_BE FSW_STRING_TYPE_UTF16_SWAPPED
 213 #else
 214 #define FSW_STRING_TYPE_UTF16_LE FSW_STRING_TYPE_UTF16_SWAPPED
 215 #define FSW_STRING_TYPE_UTF16_BE FSW_STRING_TYPE_UTF16
 216 #endif
 217
 218 /** Static initializer for an empty string. */
 219 #define FSW_STRING_INIT { FSW_STRING_TYPE_EMPTY, 0, 0, NULL }
 220
 221
 222 /* forward declarations */
 223
 224 struct fsw_dnode;
 225 struct fsw_host_table;
 226 struct fsw_fstype_table;
 227
 228 struct fsw_blockcache {
 229     fsw_u32     refcount;           //!< Reference count
 230     fsw_u32     cache_level;        //!< Level of importance of this block
 231     fsw_u32     phys_bno;           //!< Physical block number
 232     void        *data;              //!< Block data buffer
 233 };
 234
 235 /**
 236  * Core: Represents a mounted volume.
 237  */
 238
 239 struct fsw_volume {
 240     fsw_u32     phys_blocksize;     //!< Block size for disk access / file system structures
 241     fsw_u32     log_blocksize;      //!< Block size for logical file data
 242
 243     struct DNODESTRUCTNAME *root;   //!< Root directory dnode
 244     struct fsw_string label;        //!< Volume label
 245
 246     struct fsw_dnode *dnode_head;   //!< List of all dnodes allocated for this volume
 247
 248     struct fsw_blockcache *bcache;  //!< Array of block cache entries
 249     fsw_u32     bcache_size;        //!< Number of entries in the block cache array
 250
 251     void        *host_data;         //!< Hook for a host-specific data structure
 252     struct fsw_host_table *host_table;      //!< Dispatch table for host-specific functions
 253     struct fsw_fstype_table *fstype_table;  //!< Dispatch table for file system specific functions
 254     int         host_string_type;   //!< String type used by the host environment
 255 };
 256
 257 /**
 258  * Core: Represents a "directory node" - a file, directory, symlink, whatever.
 259  */
 260
 261 struct fsw_dnode {
 262     fsw_u32     refcount;           //!< Reference count
 263
 264     struct VOLSTRUCTNAME *vol;      //!< The volume this dnode belongs to
 265     struct DNODESTRUCTNAME *parent; //!< Parent directory dnode
 266     struct fsw_string name;         //!< Name of this item in the parent directory
 267
 268     fsw_u32     dnode_id;           //!< Unique id number (usually the inode number)
 269     int         type;               //!< Type of the dnode - file, dir, symlink, special
 270     fsw_u64     size;               //!< Data size in bytes
 271
 272     struct fsw_dnode *next;         //!< Doubly-linked list of all dnodes: previous dnode
 273     struct fsw_dnode *prev;         //!< Doubly-linked list of all dnodes: next dnode
 274 };
 275
 276 /**
 277  * Possible dnode types. FSW_DNODE_TYPE_UNKNOWN may only be used before
 278  * fsw_dnode_fill has been called on the dnode.
 279  */
 280 enum {
 281     FSW_DNODE_TYPE_UNKNOWN,
 282     FSW_DNODE_TYPE_FILE,
 283     FSW_DNODE_TYPE_DIR,
 284     FSW_DNODE_TYPE_SYMLINK,
 285     FSW_DNODE_TYPE_SPECIAL
 286 };
 287
 288 /**
 289  * Core: Stores the mapping of a region of a file to the data on disk.
 290  */
 291
 292 struct fsw_extent {
 293     fsw_u32     type;               //!< Type of extent specification
 294     fsw_u32     log_start;          //!< Starting logical block number
 295     fsw_u32     log_count;          //!< Logical block count
 296     fsw_u32     phys_start;         //!< Starting physical block number (for FSW_EXTENT_TYPE_PHYSBLOCK only)
 297     void        *buffer;            //!< Allocated buffer pointer (for FSW_EXTENT_TYPE_BUFFER only)
 298 };
 299
 300 /**
 301  * Possible extent representation types. FSW_EXTENT_TYPE_INVALID is for shandle's
 302  * internal use only, it must not be returned from a get_extent function.
 303  */
 304 enum {
 305     FSW_EXTENT_TYPE_INVALID,
 306     FSW_EXTENT_TYPE_SPARSE,
 307     FSW_EXTENT_TYPE_PHYSBLOCK,
 308     FSW_EXTENT_TYPE_BUFFER
 309 };
 310
 311 /**
 312  * Core: An access structure to a dnode's raw data. There can be multiple
 313  * shandles per dnode, each of them has its own position pointer.
 314  */
 315
 316 struct fsw_shandle {
 317     struct fsw_dnode *dnode;        //!< The dnode this handle reads data from
 318
 319     fsw_u64     pos;                //!< Current file pointer in bytes
 320     struct fsw_extent extent;       //!< Current extent
 321 };
 322
 323 /**
 324  * Core: Used in gathering detailed information on a volume.
 325  */
 326
 327 struct fsw_volume_stat {
 328     fsw_u64     total_bytes;        //!< Total size of data area size in bytes
 329     fsw_u64     free_bytes;         //!< Bytes still available for storing file data
 330 };
 331
 332 /**
 333  * Core: Used in gathering detailed information on a dnode.
 334  */
 335
 336 struct fsw_dnode_stat {
 337     fsw_u64     used_bytes;         //!< Bytes actually used by the file on disk
 338     void        (*store_time_posix)(struct fsw_dnode_stat *sb, int which, fsw_u32 posix_time);   //!< Callback for storing a Posix-style timestamp
 339     void        (*store_attr_posix)(struct fsw_dnode_stat *sb, fsw_u16 posix_mode);   //!< Callback for storing a Posix-style file mode
 340     void        *host_data;         //!< Hook for a host-specific data structure
 341 };
 342
 343 /**
 344  * Type of the timestamp passed into store_time_posix.
 345  */
 346 enum {
 347     FSW_DNODE_STAT_CTIME,
 348     FSW_DNODE_STAT_MTIME,
 349     FSW_DNODE_STAT_ATIME
 350 };
 351
 352 /**
 353  * Core: Function table for a host environment.
 354  */
 355
 356 struct fsw_host_table
 357 {
 358     int         native_string_type; //!< String type used by the host environment
 359
 360     void         (*change_blocksize)(struct fsw_volume *vol,
 361                                      fsw_u32 old_phys_blocksize, fsw_u32 old_log_blocksize,
 362                                      fsw_u32 new_phys_blocksize, fsw_u32 new_log_blocksize);
 363     fsw_status_t (*read_block)(struct fsw_volume *vol, fsw_u32 phys_bno, void *buffer);
 364 };
 365
 366 /**
 367  * Core: Function table for a file system driver.
 368  */
 369
 370 struct fsw_fstype_table
 371 {
 372     struct fsw_string name;         //!< String giving the name of the file system
 373     fsw_u32     volume_struct_size; //!< Size for allocating the fsw_volume structure
 374     fsw_u32     dnode_struct_size;  //!< Size for allocating the fsw_dnode structure
 375
 376     fsw_status_t (*volume_mount)(struct VOLSTRUCTNAME *vol);
 377     void         (*volume_free)(struct VOLSTRUCTNAME *vol);
 378     fsw_status_t (*volume_stat)(struct VOLSTRUCTNAME *vol, struct fsw_volume_stat *sb);
 379
 380     fsw_status_t (*dnode_fill)(struct VOLSTRUCTNAME *vol, struct DNODESTRUCTNAME *dno);
 381     void         (*dnode_free)(struct VOLSTRUCTNAME *vol, struct DNODESTRUCTNAME *dno);
 382     fsw_status_t (*dnode_stat)(struct VOLSTRUCTNAME *vol, struct DNODESTRUCTNAME *dno,
 383                                struct fsw_dnode_stat *sb);
 384     fsw_status_t (*get_extent)(struct VOLSTRUCTNAME *vol, struct DNODESTRUCTNAME *dno,
 385                                struct fsw_extent *extent);
 386
 387     fsw_status_t (*dir_lookup)(struct VOLSTRUCTNAME *vol, struct DNODESTRUCTNAME *dno,
 388                                struct fsw_string *lookup_name, struct DNODESTRUCTNAME **child_dno);
 389     fsw_status_t (*dir_read)(struct VOLSTRUCTNAME *vol, struct DNODESTRUCTNAME *dno,
 390                              struct fsw_shandle *shand, struct DNODESTRUCTNAME **child_dno);
 391     fsw_status_t (*readlink)(struct VOLSTRUCTNAME *vol, struct DNODESTRUCTNAME *dno,
 392                              struct fsw_string *link_target);
 393 };
 394
 395
 396 /**
 397  * \name Volume Functions
 398  */
 399 /*@{*/
 400
 401 fsw_status_t fsw_mount(void *host_data,
 402                        struct fsw_host_table *host_table,
 403                        struct fsw_fstype_table *fstype_table,
 404                        struct fsw_volume **vol_out);
 405 void         fsw_unmount(struct fsw_volume *vol);
 406 fsw_status_t fsw_volume_stat(struct fsw_volume *vol, struct fsw_volume_stat *sb);
 407
 408 void         fsw_set_blocksize(struct VOLSTRUCTNAME *vol, fsw_u32 phys_blocksize, fsw_u32 log_blocksize);
 409 fsw_status_t fsw_block_get(struct VOLSTRUCTNAME *vol, fsw_u32 phys_bno, fsw_u32 cache_level, void **buffer_out);
 410 void         fsw_block_release(struct VOLSTRUCTNAME *vol, fsw_u32 phys_bno, void *buffer);
 411
 412 /*@}*/
 413
 414
 415 /**
 416  * \name dnode Functions
 417  */
 418 /*@{*/
 419
 420 fsw_status_t fsw_dnode_create_root(struct VOLSTRUCTNAME *vol, fsw_u32 dnode_id, struct DNODESTRUCTNAME **dno_out);
 421 fsw_status_t fsw_dnode_create(struct DNODESTRUCTNAME *parent_dno, fsw_u32 dnode_id, int type,
 422                               struct fsw_string *name, struct DNODESTRUCTNAME **dno_out);
 423 void         fsw_dnode_retain(struct fsw_dnode *dno);
 424 void         fsw_dnode_release(struct fsw_dnode *dno);
 425
 426 fsw_status_t fsw_dnode_fill(struct fsw_dnode *dno);
 427 fsw_status_t fsw_dnode_stat(struct fsw_dnode *dno, struct fsw_dnode_stat *sb);
 428
 429 fsw_status_t fsw_dnode_lookup(struct fsw_dnode *dno,
 430                               struct fsw_string *lookup_name, struct fsw_dnode **child_dno_out);
 431 fsw_status_t fsw_dnode_lookup_path(struct fsw_dnode *dno,
 432                                    struct fsw_string *lookup_path, char separator,
 433                                    struct fsw_dnode **child_dno_out);
 434 fsw_status_t fsw_dnode_dir_read(struct fsw_shandle *shand, struct fsw_dnode **child_dno_out);
 435 fsw_status_t fsw_dnode_readlink(struct fsw_dnode *dno, struct fsw_string *link_target);
 436 fsw_status_t fsw_dnode_readlink_data(struct DNODESTRUCTNAME *dno, struct fsw_string *link_target);
 437 fsw_status_t fsw_dnode_resolve(struct fsw_dnode *dno, struct fsw_dnode **target_dno_out);
 438
 439 /*@}*/
 440
 441
 442 /**
 443  * \name shandle Functions
 444  */
 445 /*@{*/
 446
 447 fsw_status_t fsw_shandle_open(struct DNODESTRUCTNAME *dno, struct fsw_shandle *shand);
 448 void         fsw_shandle_close(struct fsw_shandle *shand);
 449 fsw_status_t fsw_shandle_read(struct fsw_shandle *shand, fsw_u32 *buffer_size_inout, void *buffer);
 450
 451 /*@}*/
 452
 453
 454 /**
 455  * \name Memory Functions
 456  */
 457 /*@{*/
 458
 459 fsw_status_t fsw_alloc_zero(int len, void **ptr_out);
 460 fsw_status_t fsw_memdup(void **dest_out, void *src, int len);
 461
 462 /*@}*/
 463
 464
 465 /**
 466  * \name String Functions
 467  */
 468 /*@{*/
 469
 470 int          fsw_strlen(struct fsw_string *s);
 471 int          fsw_streq(struct fsw_string *s1, struct fsw_string *s2);
 472 int          fsw_streq_cstr(struct fsw_string *s1, const char *s2);
 473 fsw_status_t fsw_strdup_coerce(struct fsw_string *dest, int type, struct fsw_string *src);
 474 void         fsw_strsplit(struct fsw_string *lookup_name, struct fsw_string *buffer, char separator);
 475
 476 void         fsw_strfree(struct fsw_string *s);
 477 fsw_u16      fsw_to_lower(fsw_u16 ch);
 478
 479 /*@}*/
 480
 481 /**
 482  * \name Posix Mode Macros
 483  * These macros can be used globally to test fields and bits in
 484  * Posix-style modes.
 485  *
 486  * Taken from FreeBSD sys/stat.h.
 487  */
 488 /*@{*/
 489 #ifndef S_IRWXU
 490
 491 #define S_ISUID 0004000                 /* set user id on execution */
 492 #define S_ISGID 0002000                 /* set group id on execution */
 493 #define S_ISTXT 0001000                 /* sticky bit */
 494
 495 #define S_IRWXU 0000700                 /* RWX mask for owner */
 496 #define S_IRUSR 0000400                 /* R for owner */
 497 #define S_IWUSR 0000200                 /* W for owner */
 498 #define S_IXUSR 0000100                 /* X for owner */
 499
 500 #define S_IRWXG 0000070                 /* RWX mask for group */
 501 #define S_IRGRP 0000040                 /* R for group */
 502 #define S_IWGRP 0000020                 /* W for group */
 503 #define S_IXGRP 0000010                 /* X for group */
 504
 505 #define S_IRWXO 0000007                 /* RWX mask for other */
 506 #define S_IROTH 0000004                 /* R for other */
 507 #define S_IWOTH 0000002                 /* W for other */
 508 #define S_IXOTH 0000001                 /* X for other */
 509
 510 #define S_IFMT   0170000                /* type of file mask */
 511 #define S_IFIFO  0010000                /* named pipe (fifo) */
 512 #define S_IFCHR  0020000                /* character special */
 513 #define S_IFDIR  0040000                /* directory */
 514 #define S_IFBLK  0060000                /* block special */
 515 #define S_IFREG  0100000                /* regular */
 516 #define S_IFLNK  0120000                /* symbolic link */
 517 #define S_IFSOCK 0140000                /* socket */
 518 #define S_ISVTX  0001000                /* save swapped text even after use */
 519 #define S_IFWHT  0160000                /* whiteout */
 520
 521 #define S_ISDIR(m)      (((m) & 0170000) == 0040000)    /* directory */
 522 #define S_ISCHR(m)      (((m) & 0170000) == 0020000)    /* char special */
 523 #define S_ISBLK(m)      (((m) & 0170000) == 0060000)    /* block special */
 524 #define S_ISREG(m)      (((m) & 0170000) == 0100000)    /* regular file */
 525 #define S_ISFIFO(m)     (((m) & 0170000) == 0010000)    /* fifo or socket */
 526 #define S_ISLNK(m)      (((m) & 0170000) == 0120000)    /* symbolic link */
 527 #define S_ISSOCK(m)     (((m) & 0170000) == 0140000)    /* socket */
 528 #define S_ISWHT(m)      (((m) & 0170000) == 0160000)    /* whiteout */
 529
 530 #define S_BLKSIZE       512             /* block size used in the stat struct */
 531
 532 #endif
 533 /*@}*/
 534
 535
 536 #endif