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