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 #include <linux/fs.h>
  22
  23 /*
  24  * The second extended filesystem constants/structures
  25  */
  26
  27 /*
  28  * Define EXT2FS_DEBUG to produce debug messages
  29  */
  30 #undef EXT2FS_DEBUG
  31
  32 /*
  33  * Define EXT2_RESERVATION to reserve data blocks for expanding files
  34  */
  35 #define EXT2_DEFAULT_RESERVE_BLOCKS     8
  36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
  37 #define EXT2_MAX_RESERVE_BLOCKS         1027
  38 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
  39 /*
  40  * The second extended file system version
  41  */
  42 #define EXT2FS_DATE             "95/08/09"
  43 #define EXT2FS_VERSION          "0.5b"
  44
  45 /*
  46  * Debug code
  47  */
  48 #ifdef EXT2FS_DEBUG
  49 #       define ext2_debug(f, a...)      { \
  50                                         printk ("EXT2-fs DEBUG (%s, %d): %s:", \
  51                                                 __FILE__, __LINE__, __func__); \
  52                                         printk (f, ## a); \
  53                                         }
  54 #else
  55 #       define ext2_debug(f, a...)      /**/
  56 #endif
  57
  58 /*
  59  * Special inode numbers
  60  */
  61 #define EXT2_BAD_INO             1      /* Bad blocks inode */
  62 #define EXT2_ROOT_INO            2      /* Root inode */
  63 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  64 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  65
  66 /* First non-reserved inode for old ext2 filesystems */
  67 #define EXT2_GOOD_OLD_FIRST_INO 11
  68
  69 #ifdef __KERNEL__
  70 #include <linux/ext2_fs_sb.h>
  71 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
  72 {
  73         return sb->s_fs_info;
  74 }
  75 #else
  76 /* Assume that user mode programs are passing in an ext2fs superblock, not
  77  * a kernel struct super_block.  This will allow us to call the feature-test
  78  * macros from user land. */
  79 #define EXT2_SB(sb)     (sb)
  80 #endif
  81
  82 /*
  83  * Maximal count of links to a file
  84  */
  85 #define EXT2_LINK_MAX           32000
  86
  87 /*
  88  * Macro-instructions used to manage several block sizes
  89  */
  90 #define EXT2_MIN_BLOCK_SIZE             1024
  91 #define EXT2_MAX_BLOCK_SIZE             4096
  92 #define EXT2_MIN_BLOCK_LOG_SIZE           10
  93 #ifdef __KERNEL__
  94 # define EXT2_BLOCK_SIZE(s)             ((s)->s_blocksize)
  95 #else
  96 # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  97 #endif
  98 #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
  99 #ifdef __KERNEL__
 100 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
 101 #else
 102 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
 103 #endif
 104 #ifdef __KERNEL__
 105 #define EXT2_ADDR_PER_BLOCK_BITS(s)     (EXT2_SB(s)->s_addr_per_block_bits)
 106 #define EXT2_INODE_SIZE(s)              (EXT2_SB(s)->s_inode_size)
 107 #define EXT2_FIRST_INO(s)               (EXT2_SB(s)->s_first_ino)
 108 #else
 109 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
 110                                  EXT2_GOOD_OLD_INODE_SIZE : \
 111                                  (s)->s_inode_size)
 112 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
 113                                  EXT2_GOOD_OLD_FIRST_INO : \
 114                                  (s)->s_first_ino)
 115 #endif
 116
 117 /*
 118  * Macro-instructions used to manage fragments
 119  */
 120 #define EXT2_MIN_FRAG_SIZE              1024
 121 #define EXT2_MAX_FRAG_SIZE              4096
 122 #define EXT2_MIN_FRAG_LOG_SIZE            10
 123 #ifdef __KERNEL__
 124 # define EXT2_FRAG_SIZE(s)              (EXT2_SB(s)->s_frag_size)
 125 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_SB(s)->s_frags_per_block)
 126 #else
 127 # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 128 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
 129 #endif
 130
 131 /*
 132  * Structure of a blocks group descriptor
 133  */
 134 struct ext2_group_desc
 135 {
 136         __le32  bg_block_bitmap;                /* Blocks bitmap block */
 137         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
 138         __le32  bg_inode_table;         /* Inodes table block */
 139         __le16  bg_free_blocks_count;   /* Free blocks count */
 140         __le16  bg_free_inodes_count;   /* Free inodes count */
 141         __le16  bg_used_dirs_count;     /* Directories count */
 142         __le16  bg_pad;
 143         __le32  bg_reserved[3];
 144 };
 145
 146 /*
 147  * Macro-instructions used to manage group descriptors
 148  */
 149 #ifdef __KERNEL__
 150 # define EXT2_BLOCKS_PER_GROUP(s)       (EXT2_SB(s)->s_blocks_per_group)
 151 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_SB(s)->s_desc_per_block)
 152 # define EXT2_INODES_PER_GROUP(s)       (EXT2_SB(s)->s_inodes_per_group)
 153 # define EXT2_DESC_PER_BLOCK_BITS(s)    (EXT2_SB(s)->s_desc_per_block_bits)
 154 #else
 155 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 156 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 157 # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 158 #endif
 159
 160 /*
 161  * Constants relative to the data blocks
 162  */
 163 #define EXT2_NDIR_BLOCKS                12
 164 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 165 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 166 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 167 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 168
 169 /*
 170  * Inode flags (GETFLAGS/SETFLAGS)
 171  */
 172 #define EXT2_SECRM_FL                   FS_SECRM_FL     /* Secure deletion */
 173 #define EXT2_UNRM_FL                    FS_UNRM_FL      /* Undelete */
 174 #define EXT2_COMPR_FL                   FS_COMPR_FL     /* Compress file */
 175 #define EXT2_SYNC_FL                    FS_SYNC_FL      /* Synchronous updates */
 176 #define EXT2_IMMUTABLE_FL               FS_IMMUTABLE_FL /* Immutable file */
 177 #define EXT2_APPEND_FL                  FS_APPEND_FL    /* writes to file may only append */
 178 #define EXT2_NODUMP_FL                  FS_NODUMP_FL    /* do not dump file */
 179 #define EXT2_NOATIME_FL                 FS_NOATIME_FL   /* do not update atime */
 180 /* Reserved for compression usage... */
 181 #define EXT2_DIRTY_FL                   FS_DIRTY_FL
 182 #define EXT2_COMPRBLK_FL                FS_COMPRBLK_FL  /* One or more compressed clusters */
 183 #define EXT2_NOCOMP_FL                  FS_NOCOMP_FL    /* Don't compress */
 184 #define EXT2_ECOMPR_FL                  FS_ECOMPR_FL    /* Compression error */
 185 /* End compression flags --- maybe not all used */
 186 #define EXT2_BTREE_FL                   FS_BTREE_FL     /* btree format dir */
 187 #define EXT2_INDEX_FL                   FS_INDEX_FL     /* hash-indexed directory */
 188 #define EXT2_IMAGIC_FL                  FS_IMAGIC_FL    /* AFS directory */
 189 #define EXT2_JOURNAL_DATA_FL            FS_JOURNAL_DATA_FL /* Reserved for ext3 */
 190 #define EXT2_NOTAIL_FL                  FS_NOTAIL_FL    /* file tail should not be merged */
 191 #define EXT2_DIRSYNC_FL                 FS_DIRSYNC_FL   /* dirsync behaviour (directories only) */
 192 #define EXT2_TOPDIR_FL                  FS_TOPDIR_FL    /* Top of directory hierarchies*/
 193 #define EXT2_RESERVED_FL                FS_RESERVED_FL  /* reserved for ext2 lib */
 194
 195 #define EXT2_FL_USER_VISIBLE            FS_FL_USER_VISIBLE      /* User visible flags */
 196 #define EXT2_FL_USER_MODIFIABLE         FS_FL_USER_MODIFIABLE   /* User modifiable flags */
 197
 198 /* Flags that should be inherited by new inodes from their parent. */
 199 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
 200                            EXT2_SYNC_FL | EXT2_NODUMP_FL |\
 201                            EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\
 202                            EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
 203                            EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
 204
 205 /* Flags that are appropriate for regular files (all but dir-specific ones). */
 206 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
 207
 208 /* Flags that are appropriate for non-directories/regular files. */
 209 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
 210
 211 /* Mask out flags that are inappropriate for the given type of inode. */
 212 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
 213 {
 214         if (S_ISDIR(mode))
 215                 return flags;
 216         else if (S_ISREG(mode))
 217                 return flags & EXT2_REG_FLMASK;
 218         else
 219                 return flags & EXT2_OTHER_FLMASK;
 220 }
 221
 222 /*
 223  * ioctl commands
 224  */
 225 #define EXT2_IOC_GETFLAGS               FS_IOC_GETFLAGS
 226 #define EXT2_IOC_SETFLAGS               FS_IOC_SETFLAGS
 227 #define EXT2_IOC_GETVERSION             FS_IOC_GETVERSION
 228 #define EXT2_IOC_SETVERSION             FS_IOC_SETVERSION
 229 #define EXT2_IOC_GETRSVSZ               _IOR('f', 5, long)
 230 #define EXT2_IOC_SETRSVSZ               _IOW('f', 6, long)
 231
 232 /*
 233  * ioctl commands in 32 bit emulation
 234  */
 235 #define EXT2_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
 236 #define EXT2_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
 237 #define EXT2_IOC32_GETVERSION           FS_IOC32_GETVERSION
 238 #define EXT2_IOC32_SETVERSION           FS_IOC32_SETVERSION
 239
 240 /*
 241  * Structure of an inode on the disk
 242  */
 243 struct ext2_inode {
 244         __le16  i_mode;         /* File mode */
 245         __le16  i_uid;          /* Low 16 bits of Owner Uid */
 246         __le32  i_size;         /* Size in bytes */
 247         __le32  i_atime;        /* Access time */
 248         __le32  i_ctime;        /* Creation time */
 249         __le32  i_mtime;        /* Modification time */
 250         __le32  i_dtime;        /* Deletion Time */
 251         __le16  i_gid;          /* Low 16 bits of Group Id */
 252         __le16  i_links_count;  /* Links count */
 253         __le32  i_blocks;       /* Blocks count */
 254         __le32  i_flags;        /* File flags */
 255         union {
 256                 struct {
 257                         __le32  l_i_reserved1;
 258                 } linux1;
 259                 struct {
 260                         __le32  h_i_translator;
 261                 } hurd1;
 262                 struct {
 263                         __le32  m_i_reserved1;
 264                 } masix1;
 265         } osd1;                         /* OS dependent 1 */
 266         __le32  i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 267         __le32  i_generation;   /* File version (for NFS) */
 268         __le32  i_file_acl;     /* File ACL */
 269         __le32  i_dir_acl;      /* Directory ACL */
 270         __le32  i_faddr;        /* Fragment address */
 271         union {
 272                 struct {
 273                         __u8    l_i_frag;       /* Fragment number */
 274                         __u8    l_i_fsize;      /* Fragment size */
 275                         __u16   i_pad1;
 276                         __le16  l_i_uid_high;   /* these 2 fields    */
 277                         __le16  l_i_gid_high;   /* were reserved2[0] */
 278                         __u32   l_i_reserved2;
 279                 } linux2;
 280                 struct {
 281                         __u8    h_i_frag;       /* Fragment number */
 282                         __u8    h_i_fsize;      /* Fragment size */
 283                         __le16  h_i_mode_high;
 284                         __le16  h_i_uid_high;
 285                         __le16  h_i_gid_high;
 286                         __le32  h_i_author;
 287                 } hurd2;
 288                 struct {
 289                         __u8    m_i_frag;       /* Fragment number */
 290                         __u8    m_i_fsize;      /* Fragment size */
 291                         __u16   m_pad1;
 292                         __u32   m_i_reserved2[2];
 293                 } masix2;
 294         } osd2;                         /* OS dependent 2 */
 295 };
 296
 297 #define i_size_high     i_dir_acl
 298
 299 #if defined(__KERNEL__) || defined(__linux__)
 300 #define i_reserved1     osd1.linux1.l_i_reserved1
 301 #define i_frag          osd2.linux2.l_i_frag
 302 #define i_fsize         osd2.linux2.l_i_fsize
 303 #define i_uid_low       i_uid
 304 #define i_gid_low       i_gid
 305 #define i_uid_high      osd2.linux2.l_i_uid_high
 306 #define i_gid_high      osd2.linux2.l_i_gid_high
 307 #define i_reserved2     osd2.linux2.l_i_reserved2
 308 #endif
 309
 310 #ifdef  __hurd__
 311 #define i_translator    osd1.hurd1.h_i_translator
 312 #define i_frag          osd2.hurd2.h_i_frag
 313 #define i_fsize         osd2.hurd2.h_i_fsize
 314 #define i_uid_high      osd2.hurd2.h_i_uid_high
 315 #define i_gid_high      osd2.hurd2.h_i_gid_high
 316 #define i_author        osd2.hurd2.h_i_author
 317 #endif
 318
 319 #ifdef  __masix__
 320 #define i_reserved1     osd1.masix1.m_i_reserved1
 321 #define i_frag          osd2.masix2.m_i_frag
 322 #define i_fsize         osd2.masix2.m_i_fsize
 323 #define i_reserved2     osd2.masix2.m_i_reserved2
 324 #endif
 325
 326 /*
 327  * File system states
 328  */
 329 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 330 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 331
 332 /*
 333  * Mount flags
 334  */
 335 #define EXT2_MOUNT_CHECK                0x000001  /* Do mount-time checks */
 336 #define EXT2_MOUNT_OLDALLOC             0x000002  /* Don't use the new Orlov allocator */
 337 #define EXT2_MOUNT_GRPID                0x000004  /* Create files with directory's group */
 338 #define EXT2_MOUNT_DEBUG                0x000008  /* Some debugging messages */
 339 #define EXT2_MOUNT_ERRORS_CONT          0x000010  /* Continue on errors */
 340 #define EXT2_MOUNT_ERRORS_RO            0x000020  /* Remount fs ro on errors */
 341 #define EXT2_MOUNT_ERRORS_PANIC         0x000040  /* Panic on errors */
 342 #define EXT2_MOUNT_MINIX_DF             0x000080  /* Mimics the Minix statfs */
 343 #define EXT2_MOUNT_NOBH                 0x000100  /* No buffer_heads */
 344 #define EXT2_MOUNT_NO_UID32             0x000200  /* Disable 32-bit UIDs */
 345 #define EXT2_MOUNT_XATTR_USER           0x004000  /* Extended user attributes */
 346 #define EXT2_MOUNT_POSIX_ACL            0x008000  /* POSIX Access Control Lists */
 347 #define EXT2_MOUNT_XIP                  0x010000  /* Execute in place */
 348 #define EXT2_MOUNT_USRQUOTA             0x020000  /* user quota */
 349 #define EXT2_MOUNT_GRPQUOTA             0x040000  /* group quota */
 350 #define EXT2_MOUNT_RESERVATION          0x080000  /* Preallocation */
 351
 352
 353 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 354 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 355 #define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
 356                                          EXT2_MOUNT_##opt)
 357 /*
 358  * Maximal mount counts between two filesystem checks
 359  */
 360 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 361 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 362
 363 /*
 364  * Behaviour when detecting errors
 365  */
 366 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 367 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 368 #define EXT2_ERRORS_PANIC               3       /* Panic */
 369 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 370
 371 /*
 372  * Structure of the super block
 373  */
 374 struct ext2_super_block {
 375         __le32  s_inodes_count;         /* Inodes count */
 376         __le32  s_blocks_count;         /* Blocks count */
 377         __le32  s_r_blocks_count;       /* Reserved blocks count */
 378         __le32  s_free_blocks_count;    /* Free blocks count */
 379         __le32  s_free_inodes_count;    /* Free inodes count */
 380         __le32  s_first_data_block;     /* First Data Block */
 381         __le32  s_log_block_size;       /* Block size */
 382         __le32  s_log_frag_size;        /* Fragment size */
 383         __le32  s_blocks_per_group;     /* # Blocks per group */
 384         __le32  s_frags_per_group;      /* # Fragments per group */
 385         __le32  s_inodes_per_group;     /* # Inodes per group */
 386         __le32  s_mtime;                /* Mount time */
 387         __le32  s_wtime;                /* Write time */
 388         __le16  s_mnt_count;            /* Mount count */
 389         __le16  s_max_mnt_count;        /* Maximal mount count */
 390         __le16  s_magic;                /* Magic signature */
 391         __le16  s_state;                /* File system state */
 392         __le16  s_errors;               /* Behaviour when detecting errors */
 393         __le16  s_minor_rev_level;      /* minor revision level */
 394         __le32  s_lastcheck;            /* time of last check */
 395         __le32  s_checkinterval;        /* max. time between checks */
 396         __le32  s_creator_os;           /* OS */
 397         __le32  s_rev_level;            /* Revision level */
 398         __le16  s_def_resuid;           /* Default uid for reserved blocks */
 399         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 400         /*
 401          * These fields are for EXT2_DYNAMIC_REV superblocks only.
 402          *
 403          * Note: the difference between the compatible feature set and
 404          * the incompatible feature set is that if there is a bit set
 405          * in the incompatible feature set that the kernel doesn't
 406          * know about, it should refuse to mount the filesystem.
 407          *
 408          * e2fsck's requirements are more strict; if it doesn't know
 409          * about a feature in either the compatible or incompatible
 410          * feature set, it must abort and not try to meddle with
 411          * things it doesn't understand...
 412          */
 413         __le32  s_first_ino;            /* First non-reserved inode */
 414         __le16   s_inode_size;          /* size of inode structure */
 415         __le16  s_block_group_nr;       /* block group # of this superblock */
 416         __le32  s_feature_compat;       /* compatible feature set */
 417         __le32  s_feature_incompat;     /* incompatible feature set */
 418         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
 419         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 420         char    s_volume_name[16];      /* volume name */
 421         char    s_last_mounted[64];     /* directory where last mounted */
 422         __le32  s_algorithm_usage_bitmap; /* For compression */
 423         /*
 424          * Performance hints.  Directory preallocation should only
 425          * happen if the EXT2_COMPAT_PREALLOC flag is on.
 426          */
 427         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 428         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 429         __u16   s_padding1;
 430         /*
 431          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
 432          */
 433         __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 434         __u32   s_journal_inum;         /* inode number of journal file */
 435         __u32   s_journal_dev;          /* device number of journal file */
 436         __u32   s_last_orphan;          /* start of list of inodes to delete */
 437         __u32   s_hash_seed[4];         /* HTREE hash seed */
 438         __u8    s_def_hash_version;     /* Default hash version to use */
 439         __u8    s_reserved_char_pad;
 440         __u16   s_reserved_word_pad;
 441         __le32  s_default_mount_opts;
 442         __le32  s_first_meta_bg;        /* First metablock block group */
 443         __u32   s_reserved[190];        /* Padding to the end of the block */
 444 };
 445
 446 /*
 447  * Codes for operating systems
 448  */
 449 #define EXT2_OS_LINUX           0
 450 #define EXT2_OS_HURD            1
 451 #define EXT2_OS_MASIX           2
 452 #define EXT2_OS_FREEBSD         3
 453 #define EXT2_OS_LITES           4
 454
 455 /*
 456  * Revision levels
 457  */
 458 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 459 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 460
 461 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 462 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 463
 464 #define EXT2_GOOD_OLD_INODE_SIZE 128
 465
 466 /*
 467  * Feature set definitions
 468  */
 469
 470 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 471         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
 472 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 473         ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
 474 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 475         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
 476 #define EXT2_SET_COMPAT_FEATURE(sb,mask)                        \
 477         EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
 478 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)                     \
 479         EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
 480 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask)                      \
 481         EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
 482 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)                      \
 483         EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
 484 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
 485         EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
 486 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
 487         EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
 488
 489 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 490 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 491 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 492 #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 493 #define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
 494 #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 495 #define EXT2_FEATURE_COMPAT_ANY                 0xffffffff
 496
 497 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 498 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 499 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 500 #define EXT2_FEATURE_RO_COMPAT_ANY              0xffffffff
 501
 502 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 503 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 504 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
 505 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
 506 #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
 507 #define EXT2_FEATURE_INCOMPAT_ANY               0xffffffff
 508
 509 #define EXT2_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
 510 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE| \
 511                                          EXT2_FEATURE_INCOMPAT_META_BG)
 512 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 513                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 514                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 515 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED      ~EXT2_FEATURE_RO_COMPAT_SUPP
 516 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED       ~EXT2_FEATURE_INCOMPAT_SUPP
 517
 518 /*
 519  * Default values for user and/or group using reserved blocks
 520  */
 521 #define EXT2_DEF_RESUID         0
 522 #define EXT2_DEF_RESGID         0
 523
 524 /*
 525  * Default mount options
 526  */
 527 #define EXT2_DEFM_DEBUG         0x0001
 528 #define EXT2_DEFM_BSDGROUPS     0x0002
 529 #define EXT2_DEFM_XATTR_USER    0x0004
 530 #define EXT2_DEFM_ACL           0x0008
 531 #define EXT2_DEFM_UID16         0x0010
 532     /* Not used by ext2, but reserved for use by ext3 */
 533 #define EXT3_DEFM_JMODE         0x0060
 534 #define EXT3_DEFM_JMODE_DATA    0x0020
 535 #define EXT3_DEFM_JMODE_ORDERED 0x0040
 536 #define EXT3_DEFM_JMODE_WBACK   0x0060
 537
 538 /*
 539  * Structure of a directory entry
 540  */
 541 #define EXT2_NAME_LEN 255
 542
 543 struct ext2_dir_entry {
 544         __le32  inode;                  /* Inode number */
 545         __le16  rec_len;                /* Directory entry length */
 546         __le16  name_len;               /* Name length */
 547         char    name[EXT2_NAME_LEN];    /* File name */
 548 };
 549
 550 /*
 551  * The new version of the directory entry.  Since EXT2 structures are
 552  * stored in intel byte order, and the name_len field could never be
 553  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 554  * file_type field.
 555  */
 556 struct ext2_dir_entry_2 {
 557         __le32  inode;                  /* Inode number */
 558         __le16  rec_len;                /* Directory entry length */
 559         __u8    name_len;               /* Name length */
 560         __u8    file_type;
 561         char    name[EXT2_NAME_LEN];    /* File name */
 562 };
 563
 564 /*
 565  * Ext2 directory file types.  Only the low 3 bits are used.  The
 566  * other bits are reserved for now.
 567  */
 568 enum {
 569         EXT2_FT_UNKNOWN         = 0,
 570         EXT2_FT_REG_FILE        = 1,
 571         EXT2_FT_DIR             = 2,
 572         EXT2_FT_CHRDEV          = 3,
 573         EXT2_FT_BLKDEV          = 4,
 574         EXT2_FT_FIFO            = 5,
 575         EXT2_FT_SOCK            = 6,
 576         EXT2_FT_SYMLINK         = 7,
 577         EXT2_FT_MAX
 578 };
 579
 580 /*
 581  * EXT2_DIR_PAD defines the directory entries boundaries
 582  *
 583  * NOTE: It must be a multiple of 4
 584  */
 585 #define EXT2_DIR_PAD                    4
 586 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 587 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 588                                          ~EXT2_DIR_ROUND)
 589 #define EXT2_MAX_REC_LEN                ((1<<16)-1)
 590
 591 #endif  /* _LINUX_EXT2_FS_H */