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

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