sdk/lib/fslib/ext2lib/ext2_fs.h

   1 /*
   2  *  linux/include/linux/ext2_fs.h
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/include/linux/minix_fs.h
  12  *
  13  *  Copyright f(C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #pragma once
  17
  18 #include "types.h"              /* Changed from linux/types.h */
  19
  20 /*
  21  * The second extended filesystem constants/structures
  22  */
  23
  24 /*
  25  * Define EXT2FS_DEBUG to produce debug messages
  26  */
  27 #undef EXT2FS_DEBUG
  28
  29 /*
  30  * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
  31  */
  32 #define EXT2_PREALLOCATE
  33 #define EXT2_DEFAULT_PREALLOC_BLOCKS    8
  34
  35 /*
  36  * The second extended file system version
  37  */
  38 #define EXT2FS_DATE             "95/08/09"
  39 #define EXT2FS_VERSION          "0.5b"
  40
  41 /*
  42  * Special inodes numbers
  43  */
  44 #define EXT2_BAD_INO             1      /* Bad blocks inode */
  45 #define EXT2_ROOT_INO            2      /* Root inode */
  46 #define EXT2_ACL_IDX_INO         3      /* ACL inode */
  47 #define EXT2_ACL_DATA_INO        4      /* ACL inode */
  48 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  49 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  50 #define EXT2_RESIZE_INO          7      /* Reserved group descriptors inode */
  51 #define EXT2_JOURNAL_INO         8      /* Journal inode */
  52
  53 /* First non-reserved inode for old ext2 filesystems */
  54 #define EXT2_GOOD_OLD_FIRST_INO 11
  55
  56 /*
  57  * The second extended file system magic number
  58  */
  59 #define EXT2_SUPER_MAGIC        0xEF53
  60
  61 /*
  62  * Maximal count of links to a file
  63  */
  64 #define EXT2_LINK_MAX           32000
  65
  66 /*
  67  * Macro-instructions used to manage several block sizes
  68  */
  69 #define EXT2_MIN_BLOCK_SIZE             1024
  70 #define EXT2_MAX_BLOCK_SIZE             4096
  71 #define EXT2_MIN_BLOCK_LOG_SIZE           10
  72 #ifdef __KERNEL__
  73 # define EXT2_BLOCK_SIZE(s)             ((s)->s_blocksize)
  74 #else
  75 # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  76 #endif
  77 #define EXT2_ACLE_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
  78 #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
  79 #ifdef __KERNEL__
  80 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
  81 #else
  82 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  83 #endif
  84 #ifdef __KERNEL__
  85 #define EXT2_ADDR_PER_BLOCK_BITS(s)     ((s)->u.ext2_sb.s_addr_per_block_bits)
  86 #define EXT2_INODE_SIZE(s)              ((s)->u.ext2_sb.s_inode_size)
  87 #define EXT2_FIRST_INO(s)               ((s)->u.ext2_sb.s_first_ino)
  88 #else
  89 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  90                                  EXT2_GOOD_OLD_INODE_SIZE : \
  91                                  (s)->s_inode_size)
  92 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  93                                  EXT2_GOOD_OLD_FIRST_INO : \
  94                                  (s)->s_first_ino)
  95 #endif
  96
  97 /*
  98  * Macro-instructions used to manage fragments
  99  */
 100 #define EXT2_MIN_FRAG_SIZE              1024
 101 #define EXT2_MAX_FRAG_SIZE              4096
 102 #define EXT2_MIN_FRAG_LOG_SIZE            10
 103 #ifdef __KERNEL__
 104 # define EXT2_FRAG_SIZE(s)              ((s)->u.ext2_sb.s_frag_size)
 105 # define EXT2_FRAGS_PER_BLOCK(s)        ((s)->u.ext2_sb.s_frags_per_block)
 106 #else
 107 # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 108 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
 109 #endif
 110
 111 /*
 112  * ACL structures
 113  */
 114 struct ext2_acl_header  /* Header of Access Control Lists */
 115 {
 116         __u32   aclh_size;
 117         __u32   aclh_file_count;
 118         __u32   aclh_acle_count;
 119         __u32   aclh_first_acle;
 120 };
 121
 122 struct ext2_acl_entry   /* Access Control List Entry */
 123 {
 124         __u32   acle_size;
 125         __u16   acle_perms;     /* Access permissions */
 126         __u16   acle_type;      /* Type of entry */
 127         __u16   acle_tag;       /* User or group identity */
 128         __u16   acle_pad1;
 129         __u32   acle_next;      /* Pointer on next entry for the */
 130                                         /* same inode or on next free entry */
 131 };
 132
 133 /*
 134  * Structure of a blocks group descriptor
 135  */
 136 struct ext2_group_desc
 137 {
 138         __u32   bg_block_bitmap;                /* Blocks bitmap block */
 139         __u32   bg_inode_bitmap;                /* Inodes bitmap block */
 140         __u32   bg_inode_table;         /* Inodes table block */
 141         __u16   bg_free_blocks_count;   /* Free blocks count */
 142         __u16   bg_free_inodes_count;   /* Free inodes count */
 143         __u16   bg_used_dirs_count;     /* Directories count */
 144         __u16   bg_pad;
 145         __u32   bg_reserved[3];
 146 };
 147
 148 /*
 149  * Data structures used by the directory indexing feature
 150  *
 151  * Note: all of the multibyte integer fields are little endian.
 152  */
 153
 154 /*
 155  * Note: dx_root_info is laid out so that if it should somehow get
 156  * overlaid by a dirent the two low bits of the hash version will be
 157  * zero.  Therefore, the hash version mod 4 should never be 0.
 158  * Sincerely, the paranoia department.
 159  */
 160 struct ext2_dx_root_info {
 161         __u32 reserved_zero;
 162         __u8 hash_version; /* 0 now, 1 at release */
 163         __u8 info_length; /* 8 */
 164         __u8 indirect_levels;
 165         __u8 unused_flags;
 166 };
 167
 168 struct ext2_dx_entry {
 169         __u32 hash;
 170         __u32 block;
 171 };
 172
 173 struct ext2_dx_countlimit {
 174         __u16 limit;
 175         __u16 count;
 176 };
 177
 178
 179 /*
 180  * Macro-instructions used to manage group descriptors
 181  */
 182 #ifdef __KERNEL__
 183 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->u.ext2_sb.s_blocks_per_group)
 184 # define EXT2_DESC_PER_BLOCK(s)         ((s)->u.ext2_sb.s_desc_per_block)
 185 # define EXT2_INODES_PER_GROUP(s)       ((s)->u.ext2_sb.s_inodes_per_group)
 186 # define EXT2_DESC_PER_BLOCK_BITS(s)    ((s)->u.ext2_sb.s_desc_per_block_bits)
 187 #else
 188 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 189 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 190 # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 191 #endif
 192
 193 /*
 194  * Constants relative to the data blocks
 195  */
 196 #define EXT2_NDIR_BLOCKS                12
 197 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 198 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 199 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 200 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 201
 202 /*
 203  * Inode flags
 204  */
 205 #define EXT2_SECRM_FL                   0x00000001 /* Secure deletion */
 206 #define EXT2_UNRM_FL                    0x00000002 /* Undelete */
 207 #define EXT2_COMPR_FL                   0x00000004 /* Compress file */
 208 #define EXT2_SYNC_FL                    0x00000008 /* Synchronous updates */
 209 #define EXT2_IMMUTABLE_FL               0x00000010 /* Immutable file */
 210 #define EXT2_APPEND_FL                  0x00000020 /* writes to file may only append */
 211 #define EXT2_NODUMP_FL                  0x00000040 /* do not dump file */
 212 #define EXT2_NOATIME_FL                 0x00000080 /* do not update atime */
 213 /* Reserved for compression usage... */
 214 #define EXT2_DIRTY_FL                   0x00000100
 215 #define EXT2_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 216 #define EXT2_NOCOMPR_FL                 0x00000400 /* Access raw compressed data */
 217 #define EXT2_ECOMPR_FL                  0x00000800 /* Compression error */
 218 /* End compression flags --- maybe not all used */
 219 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 220 #define EXT2_INDEX_FL                   0x00001000 /* hash-indexed directory */
 221 #define EXT2_IMAGIC_FL                  0x00002000
 222 #define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 223 #define EXT2_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 224 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 225
 226 #define EXT2_FL_USER_VISIBLE            0x0000DFFF /* User visible flags */
 227 #define EXT2_FL_USER_MODIFIABLE         0x000080FF /* User modifiable flags */
 228
 229 /*
 230  * ioctl commands
 231  */
 232 #define EXT2_IOC_GETFLAGS               _IOR('f', 1, long)
 233 #define EXT2_IOC_SETFLAGS               _IOW('f', 2, long)
 234 #define EXT2_IOC_GETVERSION             _IOR('v', 1, long)
 235 #define EXT2_IOC_SETVERSION             _IOW('v', 2, long)
 236
 237 /*
 238  * Structure of an inode on the disk
 239  */
 240 struct ext2_inode {
 241         __u16   i_mode;         /* File mode */
 242         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 243         __u32   i_size;         /* Size in bytes */
 244         __u32   i_atime;        /* Access time */
 245         __u32   i_ctime;        /* Creation time */
 246         __u32   i_mtime;        /* Modification time */
 247         __u32   i_dtime;        /* Deletion Time */
 248         __u16   i_gid;          /* Low 16 bits of Group Id */
 249         __u16   i_links_count;  /* Links count */
 250         __u32   i_blocks;       /* Blocks count */
 251         __u32   i_flags;        /* File flags */
 252         union {
 253                 struct {
 254                         __u32  l_i_reserved1;
 255                 } linux1;
 256                 struct {
 257                         __u32  h_i_translator;
 258                 } hurd1;
 259                 struct {
 260                         __u32  m_i_reserved1;
 261                 } masix1;
 262         } osd1;                         /* OS dependent 1 */
 263         __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 264         __u32   i_generation;   /* File version (for NFS) */
 265         __u32   i_file_acl;     /* File ACL */
 266         __u32   i_dir_acl;      /* Directory ACL */
 267         __u32   i_faddr;        /* Fragment address */
 268         union {
 269                 struct {
 270                         __u8    l_i_frag;       /* Fragment number */
 271                         __u8    l_i_fsize;      /* Fragment size */
 272                         __u16   i_pad1;
 273                         __u16   l_i_uid_high;   /* these 2 fields    */
 274                         __u16   l_i_gid_high;   /* were reserved2[0] */
 275                         __u32   l_i_reserved2;
 276                 } linux2;
 277                 struct {
 278                         __u8    h_i_frag;       /* Fragment number */
 279                         __u8    h_i_fsize;      /* Fragment size */
 280                         __u16   h_i_mode_high;
 281                         __u16   h_i_uid_high;
 282                         __u16   h_i_gid_high;
 283                         __u32   h_i_author;
 284                 } hurd2;
 285                 struct {
 286                         __u8    m_i_frag;       /* Fragment number */
 287                         __u8    m_i_fsize;      /* Fragment size */
 288                         __u16   m_pad1;
 289                         __u32   m_i_reserved2[2];
 290                 } masix2;
 291         } osd2;                         /* OS dependent 2 */
 292 };
 293
 294 #define i_size_high     i_dir_acl
 295
 296 #if defined(__KERNEL__) || defined(__linux__)
 297 #define i_reserved1     osd1.linux1.l_i_reserved1
 298 #define i_frag          osd2.linux2.l_i_frag
 299 #define i_fsize         osd2.linux2.l_i_fsize
 300 #define i_uid_low       i_uid
 301 #define i_gid_low       i_gid
 302 #define i_uid_high      osd2.linux2.l_i_uid_high
 303 #define i_gid_high      osd2.linux2.l_i_gid_high
 304 #define i_reserved2     osd2.linux2.l_i_reserved2
 305
 306 #elif defined(__GNU__)
 307
 308 #define i_translator    osd1.hurd1.h_i_translator
 309 #define i_frag          osd2.hurd2.h_i_frag;
 310 #define i_fsize         osd2.hurd2.h_i_fsize;
 311 #define i_uid_high      osd2.hurd2.h_i_uid_high
 312 #define i_gid_high      osd2.hurd2.h_i_gid_high
 313 #define i_author        osd2.hurd2.h_i_author
 314
 315 #elif defined(__masix__)
 316
 317 #define i_reserved1     osd1.masix1.m_i_reserved1
 318 #define i_frag          osd2.masix2.m_i_frag
 319 #define i_fsize         osd2.masix2.m_i_fsize
 320 #define i_reserved2     osd2.masix2.m_i_reserved2
 321
 322 #endif  /* defined(__KERNEL) || defined(__linux__) */
 323
 324 /*
 325  * File system states
 326  */
 327 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 328 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 329
 330 /*
 331  * Mount flags
 332  */
 333 #define EXT2_MOUNT_CHECK                0x0001  /* Do mount-time checks */
 334 #define EXT2_MOUNT_GRPID                0x0004  /* Create files with directory's group */
 335 #define EXT2_MOUNT_DEBUG                0x0008  /* Some debugging messages */
 336 #define EXT2_MOUNT_ERRORS_CONT          0x0010  /* Continue on errors */
 337 #define EXT2_MOUNT_ERRORS_RO            0x0020  /* Remount fs ro on errors */
 338 #define EXT2_MOUNT_ERRORS_PANIC         0x0040  /* Panic on errors */
 339 #define EXT2_MOUNT_MINIX_DF             0x0080  /* Mimics the Minix statfs */
 340 #define EXT2_MOUNT_NO_UID32             0x0200  /* Disable 32-bit UIDs */
 341
 342 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 343 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 344 #define test_opt(sb, opt)               ((sb)->u.ext2_sb.s_mount_opt & \
 345                                          EXT2_MOUNT_##opt)
 346 /*
 347  * Maximal mount counts between two filesystem checks
 348  */
 349 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 350 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 351
 352 /*
 353  * Behaviour when detecting errors
 354  */
 355 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 356 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 357 #define EXT2_ERRORS_PANIC               3       /* Panic */
 358 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 359
 360 /*
 361  * Structure of the super block
 362  */
 363 struct ext2_super_block {
 364         __u32   s_inodes_count;         /* Inodes count */
 365         __u32   s_blocks_count;         /* Blocks count */
 366         __u32   s_r_blocks_count;       /* Reserved blocks count */
 367         __u32   s_free_blocks_count;    /* Free blocks count */
 368         __u32   s_free_inodes_count;    /* Free inodes count */
 369         __u32   s_first_data_block;     /* First Data Block */
 370         __u32   s_log_block_size;       /* Block size */
 371         __s32   s_log_frag_size;        /* Fragment size */
 372         __u32   s_blocks_per_group;     /* # Blocks per group */
 373         __u32   s_frags_per_group;      /* # Fragments per group */
 374         __u32   s_inodes_per_group;     /* # Inodes per group */
 375         __u32   s_mtime;                /* Mount time */
 376         __u32   s_wtime;                /* Write time */
 377         __u16   s_mnt_count;            /* Mount count */
 378         __s16   s_max_mnt_count;        /* Maximal mount count */
 379         __u16   s_magic;                /* Magic signature */
 380         __u16   s_state;                /* File system state */
 381         __u16   s_errors;               /* Behaviour when detecting errors */
 382         __u16   s_minor_rev_level;      /* minor revision level */
 383         __u32   s_lastcheck;            /* time of last check */
 384         __u32   s_checkinterval;        /* max. time between checks */
 385         __u32   s_creator_os;           /* OS */
 386         __u32   s_rev_level;            /* Revision level */
 387         __u16   s_def_resuid;           /* Default uid for reserved blocks */
 388         __u16   s_def_resgid;           /* Default gid for reserved blocks */
 389         /*
 390          * These fields are for EXT2_DYNAMIC_REV superblocks only.
 391          *
 392          * Note: the difference between the compatible feature set and
 393          * the incompatible feature set is that if there is a bit set
 394          * in the incompatible feature set that the kernel doesn't
 395          * know about, it should refuse to mount the filesystem.
 396          *
 397          * e2fsck's requirements are more strict; if it doesn't know
 398          * about a feature in either the compatible or incompatible
 399          * feature set, it must abort and not try to meddle with
 400          * things it doesn't understand...
 401          */
 402         __u32   s_first_ino;            /* First non-reserved inode */
 403         __u16   s_inode_size;           /* size of inode structure */
 404         __u16   s_block_group_nr;       /* block group # of this superblock */
 405         __u32   s_feature_compat;       /* compatible feature set */
 406         __u32   s_feature_incompat;     /* incompatible feature set */
 407         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 408         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 409         char    s_volume_name[16];      /* volume name */
 410         char    s_last_mounted[64];     /* directory where last mounted */
 411         __u32   s_algorithm_usage_bitmap; /* For compression */
 412         /*
 413          * Performance hints.  Directory preallocation should only
 414          * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 415          */
 416         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 417         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 418         __u16   s_padding1;
 419         /*
 420          * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
 421          */
 422         __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 423         __u32   s_journal_inum;         /* inode number of journal file */
 424         __u32   s_journal_dev;          /* device number of journal file */
 425         __u32   s_last_orphan;          /* start of list of inodes to delete */
 426
 427         __u32   s_reserved[197];        /* Padding to the end of the block */
 428 };
 429
 430 #ifdef __KERNEL__
 431 #define EXT2_SB(sb)     (&((sb)->u.ext2_sb))
 432 #else
 433 /* Assume that user mode programs are passing in an ext2fs superblock, not
 434  * a kernel struct super_block.  This will allow us to call the feature-test
 435  * macros from user land. */
 436 #define EXT2_SB(sb)     (sb)
 437 #endif
 438
 439 /*
 440  * Codes for operating systems
 441  */
 442 #define EXT2_OS_LINUX           0
 443 #define EXT2_OS_HURD            1
 444 #define EXT2_OS_MASIX           2
 445 #define EXT2_OS_FREEBSD         3
 446 #define EXT2_OS_LITES           4
 447 #define EXT2_OS_WINNT       5
 448
 449 /*
 450  * Revision levels
 451  */
 452 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 453 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 454
 455 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 456 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 457
 458 #define EXT2_GOOD_OLD_INODE_SIZE 128
 459
 460 /*
 461  * Feature set definitions
 462  */
 463
 464 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 465         ( EXT2_SB(sb)->s_feature_compat & (mask) )
 466 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 467         ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
 468 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 469         ( EXT2_SB(sb)->s_feature_incompat & (mask) )
 470
 471 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 472 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 473 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 474 #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 475 #define EXT2_FEATURE_COMPAT_RESIZE_INODE        0x0010
 476 #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 477
 478 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 479 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 480 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 481
 482 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 483 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 484 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 485 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */
 486
 487 #define EXT2_FEATURE_COMPAT_SUPP        0
 488 #define EXT2_FEATURE_INCOMPAT_SUPP      EXT2_FEATURE_INCOMPAT_FILETYPE
 489 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 490                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 491                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 492
 493 /*
 494  * Default values for user and/or group using reserved blocks
 495  */
 496 #define EXT2_DEF_RESUID         0
 497 #define EXT2_DEF_RESGID         0
 498
 499 /*
 500  * Structure of a directory entry
 501  */
 502 #define EXT2_NAME_LEN 255
 503
 504 struct ext2_dir_entry {
 505         __u32   inode;                  /* Inode number */
 506         __u16   rec_len;                /* Directory entry length */
 507         __u16   name_len;               /* Name length */
 508         char    name[EXT2_NAME_LEN];    /* File name */
 509 };
 510
 511 /*
 512  * The new version of the directory entry.  Since EXT2 structures are
 513  * stored in intel byte order, and the name_len field could never be
 514  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 515  * file_type field.
 516  */
 517 struct ext2_dir_entry_2 {
 518         __u32   inode;                  /* Inode number */
 519         __u16   rec_len;                /* Directory entry length */
 520         __u8    name_len;               /* Name length */
 521         __u8    file_type;
 522         char    name[EXT2_NAME_LEN];    /* File name */
 523 };
 524
 525 /*
 526  * Ext2 directory file types.  Only the low 3 bits are used.  The
 527  * other bits are reserved for now.
 528  */
 529 #define EXT2_FT_UNKNOWN         0
 530 #define EXT2_FT_REG_FILE        1
 531 #define EXT2_FT_DIR             2
 532 #define EXT2_FT_CHRDEV          3
 533 #define EXT2_FT_BLKDEV          4
 534 #define EXT2_FT_FIFO            5
 535 #define EXT2_FT_SOCK            6
 536 #define EXT2_FT_SYMLINK         7
 537
 538 #define EXT2_FT_MAX             8
 539
 540 /*
 541  * EXT2_DIR_PAD defines the directory entries boundaries
 542  *
 543  * NOTE: It must be a multiple of 4
 544  */
 545 #define EXT2_DIR_PAD                    4
 546 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 547 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 548                                          ~EXT2_DIR_ROUND)
 549
 550 #ifdef __KERNEL__
 551 /*
 552  * Function prototypes
 553  */
 554
 555 /*
 556  * Ok, these declarations are also in <linux/kernel.h> but none of the
 557  * ext2 source programs needs to include it so they are duplicated here.
 558  */
 559 # define NORET_TYPE    /**/
 560 # define ATTRIB_NORET  __attribute__((noreturn))
 561 # define NORET_AND     noreturn,
 562
 563 /* acl.c */
 564 extern int ext2_permission (struct inode *, int);
 565
 566 /* balloc.c */
 567 extern int ext2_bg_has_super(struct super_block *sb, int group);
 568 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
 569 extern int ext2_new_block (const struct inode *, unsigned long,
 570                            __u32 *, __u32 *, int *);
 571 extern void ext2_free_blocks (const struct inode *, unsigned long,
 572                               unsigned long);
 573 extern unsigned long ext2_count_free_blocks (struct super_block *);
 574 extern void ext2_check_blocks_bitmap (struct super_block *);
 575 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
 576                                                     unsigned int block_group,
 577                                                     struct buffer_head ** bh);
 578
 579 /* bitmap.c */
 580 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
 581
 582 /* dir.c */
 583 extern int ext2_check_dir_entry (const char *, struct inode *,
 584                                  struct ext2_dir_entry_2 *, struct buffer_head *,
 585                                  unsigned long);
 586
 587 /* file.c */
 588 extern int ext2_read (struct inode *, struct file *, char *, int);
 589 extern int ext2_write (struct inode *, struct file *, char *, int);
 590
 591 /* fsync.c */
 592 extern int ext2_sync_file (struct file *, struct dentry *, int);
 593 extern int ext2_fsync_inode (struct inode *, int);
 594
 595 /* ialloc.c */
 596 extern struct inode * ext2_new_inode (const struct inode *, int);
 597 extern void ext2_free_inode (struct inode *);
 598 extern unsigned long ext2_count_free_inodes (struct super_block *);
 599 extern void ext2_check_inodes_bitmap (struct super_block *);
 600
 601 /* inode.c */
 602
 603 extern struct buffer_head * ext2_getblk (struct inode *, long, int, int *);
 604 extern struct buffer_head * ext2_bread (struct inode *, int, int, int *);
 605
 606 extern void ext2_read_inode (struct inode *);
 607 extern void ext2_write_inode (struct inode *, int);
 608 extern void ext2_put_inode (struct inode *);
 609 extern void ext2_delete_inode (struct inode *);
 610 extern int ext2_sync_inode (struct inode *);
 611 extern void ext2_discard_prealloc (struct inode *);
 612
 613 /* ioctl.c */
 614 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
 615                        unsigned long);
 616
 617 /* namei.c */
 618 extern struct inode_operations ext2_dir_inode_operations;
 619
 620 /* super.c */
 621 extern void ext2_error (struct super_block *, const char *, const char *, ...)
 622         __attribute__ ((format (printf, 3, 4)));
 623 extern NORET_TYPE void ext2_panic (struct super_block *, const char *,
 624                                    const char *, ...)
 625         __attribute__ ((NORET_AND format (printf, 3, 4)));
 626 extern void ext2_warning (struct super_block *, const char *, const char *, ...)
 627         __attribute__ ((format (printf, 3, 4)));
 628 extern void ext2_update_dynamic_rev (struct super_block *sb);
 629 extern void ext2_put_super (struct super_block *);
 630 extern void ext2_write_super (struct super_block *);
 631 extern int ext2_remount (struct super_block *, int *, char *);
 632 extern struct super_block * ext2_read_super (struct super_block *,void *,int);
 633 extern int ext2_statfs (struct super_block *, struct statfs *);
 634
 635 /* truncate.c */
 636 extern void ext2_truncate (struct inode *);
 637
 638 /*
 639  * Inodes and files operations
 640  */
 641
 642 /* dir.c */
 643 extern struct file_operations ext2_dir_operations;
 644
 645 /* file.c */
 646 extern struct inode_operations ext2_file_inode_operations;
 647 extern struct file_operations ext2_file_operations;
 648
 649 /* symlink.c */
 650 extern struct inode_operations ext2_fast_symlink_inode_operations;
 651
 652 extern struct address_space_operations ext2_aops;
 653
 654 #endif  /* __KERNEL__ */