release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/sysroot/usr/include/linux/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 (C) 1991, 1992  Linus Torvalds
  14  */
  15
  16 #ifndef _LINUX_EXT2_FS_H
  17 #define _LINUX_EXT2_FS_H
  18
  19 #include <linux/types.h>
  20 #include <linux/magic.h>
  21
  22 /*
  23  * The second extended filesystem constants/structures
  24  */
  25
  26 /*
  27  * Define EXT2FS_DEBUG to produce debug messages
  28  */
  29 #undef EXT2FS_DEBUG
  30
  31 /*
  32  * Define EXT2_RESERVATION to reserve data blocks for expanding files
  33  */
  34 #define EXT2_DEFAULT_RESERVE_BLOCKS     8
  35 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  36 #define EXT2_MAX_RESERVE_BLOCKS         1027
  37 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
  38 /*
  39  * The second extended file system version
  40  */
  41 #define EXT2FS_DATE             "95/08/09"
  42 #define EXT2FS_VERSION          "0.5b"
  43
  44 /*
  45  * Debug code
  46  */
  47 #ifdef EXT2FS_DEBUG
  48 #       define ext2_debug(f, a...)      { \
  49                                         printk ("EXT2-fs DEBUG (%s, %d): %s:", \
  50                                                 __FILE__, __LINE__, __func__); \
  51                                         printk (f, ## a); \
  52                                         }
  53 #else
  54 #       define ext2_debug(f, a...)      /**/
  55 #endif
  56
  57 /*
  58  * Special inode numbers
  59  */
  60 #define EXT2_BAD_INO             1      /* Bad blocks inode */
  61 #define EXT2_ROOT_INO            2      /* Root inode */
  62 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  63 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  64
  65 /* First non-reserved inode for old ext2 filesystems */
  66 #define EXT2_GOOD_OLD_FIRST_INO 11
  67
  68 /* Assume that user mode programs are passing in an ext2fs superblock, not
  69  * a kernel struct super_block.  This will allow us to call the feature-test
  70  * macros from user land. */
  71 #define EXT2_SB(sb)     (sb)
  72
  73 /*
  74  * Maximal count of links to a file
  75  */
  76 #define EXT2_LINK_MAX           32000
  77
  78 /*
  79  * Macro-instructions used to manage several block sizes
  80  */
  81 #define EXT2_MIN_BLOCK_SIZE             1024
  82 #define EXT2_MAX_BLOCK_SIZE             4096
  83 #define EXT2_MIN_BLOCK_LOG_SIZE           10
  84 # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  85 #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
  86 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  87 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  88                                  EXT2_GOOD_OLD_INODE_SIZE : \
  89                                  (s)->s_inode_size)
  90 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  91                                  EXT2_GOOD_OLD_FIRST_INO : \
  92                                  (s)->s_first_ino)
  93
  94 /*
  95  * Macro-instructions used to manage fragments
  96  */
  97 #define EXT2_MIN_FRAG_SIZE              1024
  98 #define EXT2_MAX_FRAG_SIZE              4096
  99 #define EXT2_MIN_FRAG_LOG_SIZE            10
 100 # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 101 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
 102
 103 /*
 104  * Structure of a blocks group descriptor
 105  */
 106 struct ext2_group_desc
 107 {
 108         __le32  bg_block_bitmap;                /* Blocks bitmap block */
 109         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
 110         __le32  bg_inode_table;         /* Inodes table block */
 111         __le16  bg_free_blocks_count;   /* Free blocks count */
 112         __le16  bg_free_inodes_count;   /* Free inodes count */
 113         __le16  bg_used_dirs_count;     /* Directories count */
 114         __le16  bg_pad;
 115         __le32  bg_reserved[3];
 116 };
 117
 118 /*
 119  * Macro-instructions used to manage group descriptors
 120  */
 121 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 122 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 123 # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 124
 125 /*
 126  * Constants relative to the data blocks
 127  */
 128 #define EXT2_NDIR_BLOCKS                12
 129 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 130 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 131 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 132 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 133
 134 /*
 135  * Inode flags (GETFLAGS/SETFLAGS)
 136  */
 137 #define EXT2_SECRM_FL                   FS_SECRM_FL     /* Secure deletion */
 138 #define EXT2_UNRM_FL                    FS_UNRM_FL      /* Undelete */
 139 #define EXT2_COMPR_FL                   FS_COMPR_FL     /* Compress file */
 140 #define EXT2_SYNC_FL                    FS_SYNC_FL      /* Synchronous updates */
 141 #define EXT2_IMMUTABLE_FL               FS_IMMUTABLE_FL /* Immutable file */
 142 #define EXT2_APPEND_FL                  FS_APPEND_FL    /* writes to file may only append */
 143 #define EXT2_NODUMP_FL                  FS_NODUMP_FL    /* do not dump file */
 144 #define EXT2_NOATIME_FL                 FS_NOATIME_FL   /* do not update atime */
 145 /* Reserved for compression usage... */
 146 #define EXT2_DIRTY_FL                   FS_DIRTY_FL
 147 #define EXT2_COMPRBLK_FL                FS_COMPRBLK_FL  /* One or more compressed clusters */
 148 #define EXT2_NOCOMP_FL                  FS_NOCOMP_FL    /* Don't compress */
 149 #define EXT2_ECOMPR_FL                  FS_ECOMPR_FL    /* Compression error */
 150 /* End compression flags --- maybe not all used */
 151 #define EXT2_BTREE_FL                   FS_BTREE_FL     /* btree format dir */
 152 #define EXT2_INDEX_FL                   FS_INDEX_FL     /* hash-indexed directory */
 153 #define EXT2_IMAGIC_FL                  FS_IMAGIC_FL    /* AFS directory */
 154 #define EXT2_JOURNAL_DATA_FL            FS_JOURNAL_DATA_FL /* Reserved for ext3 */
 155 #define EXT2_NOTAIL_FL                  FS_NOTAIL_FL    /* file tail should not be merged */
 156 #define EXT2_DIRSYNC_FL                 FS_DIRSYNC_FL   /* dirsync behaviour (directories only) */
 157 #define EXT2_TOPDIR_FL                  FS_TOPDIR_FL    /* Top of directory hierarchies*/
 158 #define EXT2_RESERVED_FL                FS_RESERVED_FL  /* reserved for ext2 lib */
 159
 160 #define EXT2_FL_USER_VISIBLE            FS_FL_USER_VISIBLE      /* User visible flags */
 161 #define EXT2_FL_USER_MODIFIABLE         FS_FL_USER_MODIFIABLE   /* User modifiable flags */
 162
 163 /* Flags that should be inherited by new inodes from their parent. */
 164 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
 165                            EXT2_SYNC_FL | EXT2_IMMUTABLE_FL | EXT2_APPEND_FL |\
 166                            EXT2_NODUMP_FL | EXT2_NOATIME_FL | EXT2_COMPRBLK_FL|\
 167                            EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
 168                            EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
 169
 170 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 171 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
 172
 173 /* Flags that are appropriate for non-directories/regular files. */
 174 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
 175
 176 /* Mask out flags that are inappropriate for the given type of inode. */
 177 static __inline__ __u32 ext2_mask_flags(umode_t mode, __u32 flags)
 178 {
 179         if (S_ISDIR(mode))
 180                 return flags;
 181         else if (S_ISREG(mode))
 182                 return flags & EXT2_REG_FLMASK;
 183         else
 184                 return flags & EXT2_OTHER_FLMASK;
 185 }
 186
 187 /*
 188  * ioctl commands
 189  */
 190 #define EXT2_IOC_GETFLAGS               FS_IOC_GETFLAGS
 191 #define EXT2_IOC_SETFLAGS               FS_IOC_SETFLAGS
 192 #define EXT2_IOC_GETVERSION             FS_IOC_GETVERSION
 193 #define EXT2_IOC_SETVERSION             FS_IOC_SETVERSION
 194 #define EXT2_IOC_GETRSVSZ               _IOR('f', 5, long)
 195 #define EXT2_IOC_SETRSVSZ               _IOW('f', 6, long)
 196
 197 /*
 198  * ioctl commands in 32 bit emulation
 199  */
 200 #define EXT2_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 201 #define EXT2_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 202 #define EXT2_IOC32_GETVERSION           FS_IOC32_GETVERSION
 203 #define EXT2_IOC32_SETVERSION           FS_IOC32_SETVERSION
 204
 205 /*
 206  * Structure of an inode on the disk
 207  */
 208 struct ext2_inode {
 209         __le16  i_mode;         /* File mode */
 210         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 211         __le32  i_size;         /* Size in bytes */
 212         __le32  i_atime;        /* Access time */
 213         __le32  i_ctime;        /* Creation time */
 214         __le32  i_mtime;        /* Modification time */
 215         __le32  i_dtime;        /* Deletion Time */
 216         __le16  i_gid;          /* Low 16 bits of Group Id */
 217         __le16  i_links_count;  /* Links count */
 218         __le32  i_blocks;       /* Blocks count */
 219         __le32  i_flags;        /* File flags */
 220         union {
 221                 struct {
 222                         __le32  l_i_reserved1;
 223                 } linux1;
 224                 struct {
 225                         __le32  h_i_translator;
 226                 } hurd1;
 227                 struct {
 228                         __le32  m_i_reserved1;
 229                 } masix1;
 230         } osd1;                         /* OS dependent 1 */
 231         __le32  i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 232         __le32  i_generation;   /* File version (for NFS) */
 233         __le32  i_file_acl;     /* File ACL */
 234         __le32  i_dir_acl;      /* Directory ACL */
 235         __le32  i_faddr;        /* Fragment address */
 236         union {
 237                 struct {
 238                         __u8    l_i_frag;       /* Fragment number */
 239                         __u8    l_i_fsize;      /* Fragment size */
 240                         __u16   i_pad1;
 241                         __le16  l_i_uid_high;   /* these 2 fields    */
 242                         __le16  l_i_gid_high;   /* were reserved2[0] */
 243                         __u32   l_i_reserved2;
 244                 } linux2;
 245                 struct {
 246                         __u8    h_i_frag;       /* Fragment number */
 247                         __u8    h_i_fsize;      /* Fragment size */
 248                         __le16  h_i_mode_high;
 249                         __le16  h_i_uid_high;
 250                         __le16  h_i_gid_high;
 251                         __le32  h_i_author;
 252                 } hurd2;
 253                 struct {
 254                         __u8    m_i_frag;       /* Fragment number */
 255                         __u8    m_i_fsize;      /* Fragment size */
 256                         __u16   m_pad1;
 257                         __u32   m_i_reserved2[2];
 258                 } masix2;
 259         } osd2;                         /* OS dependent 2 */
 260 };
 261
 262 #define i_size_high     i_dir_acl
 263
 264 #if defined(__KERNEL__) || defined(__linux__)
 265 #define i_reserved1     osd1.linux1.l_i_reserved1
 266 #define i_frag          osd2.linux2.l_i_frag
 267 #define i_fsize         osd2.linux2.l_i_fsize
 268 #define i_uid_low       i_uid
 269 #define i_gid_low       i_gid
 270 #define i_uid_high      osd2.linux2.l_i_uid_high
 271 #define i_gid_high      osd2.linux2.l_i_gid_high
 272 #define i_reserved2     osd2.linux2.l_i_reserved2
 273 #endif
 274
 275 #ifdef  __hurd__
 276 #define i_translator    osd1.hurd1.h_i_translator
 277 #define i_frag          osd2.hurd2.h_i_frag
 278 #define i_fsize         osd2.hurd2.h_i_fsize
 279 #define i_uid_high      osd2.hurd2.h_i_uid_high
 280 #define i_gid_high      osd2.hurd2.h_i_gid_high
 281 #define i_author        osd2.hurd2.h_i_author
 282 #endif
 283
 284 #ifdef  __masix__
 285 #define i_reserved1     osd1.masix1.m_i_reserved1
 286 #define i_frag          osd2.masix2.m_i_frag
 287 #define i_fsize         osd2.masix2.m_i_fsize
 288 #define i_reserved2     osd2.masix2.m_i_reserved2
 289 #endif
 290
 291 /*
 292  * File system states
 293  */
 294 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 295 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 296
 297 /*
 298  * Mount flags
 299  */
 300 #define EXT2_MOUNT_CHECK                0x000001  /* Do mount-time checks */
 301 #define EXT2_MOUNT_OLDALLOC             0x000002  /* Don't use the new Orlov allocator */
 302 #define EXT2_MOUNT_GRPID                0x000004  /* Create files with directory's group */
 303 #define EXT2_MOUNT_DEBUG                0x000008  /* Some debugging messages */
 304 #define EXT2_MOUNT_ERRORS_CONT          0x000010  /* Continue on errors */
 305 #define EXT2_MOUNT_ERRORS_RO            0x000020  /* Remount fs ro on errors */
 306 #define EXT2_MOUNT_ERRORS_PANIC         0x000040  /* Panic on errors */
 307 #define EXT2_MOUNT_MINIX_DF             0x000080  /* Mimics the Minix statfs */
 308 #define EXT2_MOUNT_NOBH                 0x000100  /* No buffer_heads */
 309 #define EXT2_MOUNT_NO_UID32             0x000200  /* Disable 32-bit UIDs */
 310 #define EXT2_MOUNT_XATTR_USER           0x004000  /* Extended user attributes */
 311 #define EXT2_MOUNT_POSIX_ACL            0x008000  /* POSIX Access Control Lists */
 312 #define EXT2_MOUNT_XIP                  0x010000  /* Execute in place */
 313 #define EXT2_MOUNT_USRQUOTA             0x020000  /* user quota */
 314 #define EXT2_MOUNT_GRPQUOTA             0x040000  /* group quota */
 315 #define EXT2_MOUNT_RESERVATION          0x080000  /* Preallocation */
 316
 317
 318 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 319 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 320 #define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
 321                                          EXT2_MOUNT_##opt)
 322 /*
 323  * Maximal mount counts between two filesystem checks
 324  */
 325 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 326 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 327
 328 /*
 329  * Behaviour when detecting errors
 330  */
 331 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 332 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 333 #define EXT2_ERRORS_PANIC               3       /* Panic */
 334 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 335
 336 /*
 337  * Structure of the super block
 338  */
 339 struct ext2_super_block {
 340         __le32  s_inodes_count;         /* Inodes count */
 341         __le32  s_blocks_count;         /* Blocks count */
 342         __le32  s_r_blocks_count;       /* Reserved blocks count */
 343         __le32  s_free_blocks_count;    /* Free blocks count */
 344         __le32  s_free_inodes_count;    /* Free inodes count */
 345         __le32  s_first_data_block;     /* First Data Block */
 346         __le32  s_log_block_size;       /* Block size */
 347         __le32  s_log_frag_size;        /* Fragment size */
 348         __le32  s_blocks_per_group;     /* # Blocks per group */
 349         __le32  s_frags_per_group;      /* # Fragments per group */
 350         __le32  s_inodes_per_group;     /* # Inodes per group */
 351         __le32  s_mtime;                /* Mount time */
 352         __le32  s_wtime;                /* Write time */
 353         __le16  s_mnt_count;            /* Mount count */
 354         __le16  s_max_mnt_count;        /* Maximal mount count */
 355         __le16  s_magic;                /* Magic signature */
 356         __le16  s_state;                /* File system state */
 357         __le16  s_errors;               /* Behaviour when detecting errors */
 358         __le16  s_minor_rev_level;      /* minor revision level */
 359         __le32  s_lastcheck;            /* time of last check */
 360         __le32  s_checkinterval;        /* max. time between checks */
 361         __le32  s_creator_os;           /* OS */
 362         __le32  s_rev_level;            /* Revision level */
 363         __le16  s_def_resuid;           /* Default uid for reserved blocks */
 364         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 365         /*
 366          * These fields are for EXT2_DYNAMIC_REV superblocks only.
 367          *
 368          * Note: the difference between the compatible feature set and
 369          * the incompatible feature set is that if there is a bit set
 370          * in the incompatible feature set that the kernel doesn't
 371          * know about, it should refuse to mount the filesystem.
 372          *
 373          * e2fsck's requirements are more strict; if it doesn't know
 374          * about a feature in either the compatible or incompatible
 375          * feature set, it must abort and not try to meddle with
 376          * things it doesn't understand...
 377          */
 378         __le32  s_first_ino;            /* First non-reserved inode */
 379         __le16   s_inode_size;          /* size of inode structure */
 380         __le16  s_block_group_nr;       /* block group # of this superblock */
 381         __le32  s_feature_compat;       /* compatible feature set */
 382         __le32  s_feature_incompat;     /* incompatible feature set */
 383         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 384         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 385         char    s_volume_name[16];      /* volume name */
 386         char    s_last_mounted[64];     /* directory where last mounted */
 387         __le32  s_algorithm_usage_bitmap; /* For compression */
 388         /*
 389          * Performance hints.  Directory preallocation should only
 390          * happen if the EXT2_COMPAT_PREALLOC flag is on.
 391          */
 392         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 393         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 394         __u16   s_padding1;
 395         /*
 396          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 397          */
 398         __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 399         __u32   s_journal_inum;         /* inode number of journal file */
 400         __u32   s_journal_dev;          /* device number of journal file */
 401         __u32   s_last_orphan;          /* start of list of inodes to delete */
 402         __u32   s_hash_seed[4];         /* HTREE hash seed */
 403         __u8    s_def_hash_version;     /* Default hash version to use */
 404         __u8    s_reserved_char_pad;
 405         __u16   s_reserved_word_pad;
 406         __le32  s_default_mount_opts;
 407         __le32  s_first_meta_bg;        /* First metablock block group */
 408         __u32   s_reserved[190];        /* Padding to the end of the block */
 409 };
 410
 411 /*
 412  * Codes for operating systems
 413  */
 414 #define EXT2_OS_LINUX           0
 415 #define EXT2_OS_HURD            1
 416 #define EXT2_OS_MASIX           2
 417 #define EXT2_OS_FREEBSD         3
 418 #define EXT2_OS_LITES           4
 419
 420 /*
 421  * Revision levels
 422  */
 423 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 424 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 425
 426 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 427 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 428
 429 #define EXT2_GOOD_OLD_INODE_SIZE 128
 430
 431 /*
 432  * Feature set definitions
 433  */
 434
 435 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 436         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 437 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 438         ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 439 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 440         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 441 #define EXT2_SET_COMPAT_FEATURE(sb,mask)                        \
 442         EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 443 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 444         EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 445 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask)                      \
 446         EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 447 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 448         EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 449 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 450         EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 451 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 452         EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 453
 454 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 455 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 456 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 457 #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 458 #define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
 459 #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 460 #define EXT2_FEATURE_COMPAT_ANY                 0xffffffff
 461
 462 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 463 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 464 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 465 #define EXT2_FEATURE_RO_COMPAT_ANY              0xffffffff
 466
 467 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 468 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 469 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
 470 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
 471 #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
 472 #define EXT2_FEATURE_INCOMPAT_ANY               0xffffffff
 473
 474 #define EXT2_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 475 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE| \
 476                                          EXT2_FEATURE_INCOMPAT_META_BG)
 477 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 478                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 479                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 480 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED      ~EXT2_FEATURE_RO_COMPAT_SUPP
 481 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED       ~EXT2_FEATURE_INCOMPAT_SUPP
 482
 483 /*
 484  * Default values for user and/or group using reserved blocks
 485  */
 486 #define EXT2_DEF_RESUID         0
 487 #define EXT2_DEF_RESGID         0
 488
 489 /*
 490  * Default mount options
 491  */
 492 #define EXT2_DEFM_DEBUG         0x0001
 493 #define EXT2_DEFM_BSDGROUPS     0x0002
 494 #define EXT2_DEFM_XATTR_USER    0x0004
 495 #define EXT2_DEFM_ACL           0x0008
 496 #define EXT2_DEFM_UID16         0x0010
 497     /* Not used by ext2, but reserved for use by ext3 */
 498 #define EXT3_DEFM_JMODE         0x0060
 499 #define EXT3_DEFM_JMODE_DATA    0x0020
 500 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 501 #define EXT3_DEFM_JMODE_WBACK   0x0060
 502
 503 /*
 504  * Structure of a directory entry
 505  */
 506 #define EXT2_NAME_LEN 255
 507
 508 struct ext2_dir_entry {
 509         __le32  inode;                  /* Inode number */
 510         __le16  rec_len;                /* Directory entry length */
 511         __le16  name_len;               /* Name length */
 512         char    name[EXT2_NAME_LEN];    /* File name */
 513 };
 514
 515 /*
 516  * The new version of the directory entry.  Since EXT2 structures are
 517  * stored in intel byte order, and the name_len field could never be
 518  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 519  * file_type field.
 520  */
 521 struct ext2_dir_entry_2 {
 522         __le32  inode;                  /* Inode number */
 523         __le16  rec_len;                /* Directory entry length */
 524         __u8    name_len;               /* Name length */
 525         __u8    file_type;
 526         char    name[EXT2_NAME_LEN];    /* File name */
 527 };
 528
 529 /*
 530  * Ext2 directory file types.  Only the low 3 bits are used.  The
 531  * other bits are reserved for now.
 532  */
 533 enum {
 534         EXT2_FT_UNKNOWN         = 0,
 535         EXT2_FT_REG_FILE        = 1,
 536         EXT2_FT_DIR             = 2,
 537         EXT2_FT_CHRDEV          = 3,
 538         EXT2_FT_BLKDEV          = 4,
 539         EXT2_FT_FIFO            = 5,
 540         EXT2_FT_SOCK            = 6,
 541         EXT2_FT_SYMLINK         = 7,
 542         EXT2_FT_MAX
 543 };
 544
 545 /*
 546  * EXT2_DIR_PAD defines the directory entries boundaries
 547  *
 548  * NOTE: It must be a multiple of 4
 549  */
 550 #define EXT2_DIR_PAD                    4
 551 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 552 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 553                                          ~EXT2_DIR_ROUND)
 554 #define EXT2_MAX_REC_LEN                ((1<<16)-1)
 555
 556 #endif  /* _LINUX_EXT2_FS_H */