LXR busybox/include/bb_e2fs

   1/* vi: set sw=4 ts=4: */
   2/*
   3 *  linux/include/linux/ext2_fs.h
   4 *
   5 * Copyright (C) 1992, 1993, 1994, 1995
   6 * Remy Card (card@masi.ibp.fr)
   7 * Laboratoire MASI - Institut Blaise Pascal
   8 * Universite Pierre et Marie Curie (Paris VI)
   9 *
  10 * Copyright (C) 1991, 1992  Linus Torvalds
  11 */
  12
  13#ifndef LINUX_EXT2_FS_H
  14#define LINUX_EXT2_FS_H 1
  15
  16/*
  17 * Special inode numbers
  18 */
  19#define EXT2_BAD_INO             1      /* Bad blocks inode */
  20#define EXT2_ROOT_INO            2      /* Root inode */
  21#define EXT2_ACL_IDX_INO         3      /* ACL inode */
  22#define EXT2_ACL_DATA_INO        4      /* ACL inode */
  23#define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  24#define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  25#define EXT2_RESIZE_INO          7      /* Reserved group descriptors inode */
  26#define EXT2_JOURNAL_INO         8      /* Journal inode */
  27
  28/* First non-reserved inode for old ext2 filesystems */
  29#define EXT2_GOOD_OLD_FIRST_INO 11
  30
  31/*
  32 * The second extended file system magic number
  33 */
  34#define EXT2_SUPER_MAGIC        0xEF53
  35
  36/* Assume that user mode programs are passing in an ext2fs superblock, not
  37 * a kernel struct super_block.  This will allow us to call the feature-test
  38 * macros from user land. */
  39#define EXT2_SB(sb)     (sb)
  40
  41/*
  42 * Maximal count of links to a file
  43 */
  44#define EXT2_LINK_MAX           32000
  45
  46/*
  47 * Macro-instructions used to manage several block sizes
  48 */
  49#define EXT2_MIN_BLOCK_LOG_SIZE         10      /* 1024 */
  50#define EXT2_MAX_BLOCK_LOG_SIZE         16      /* 65536 */
  51#define EXT2_MIN_BLOCK_SIZE     (1 << EXT2_MIN_BLOCK_LOG_SIZE)
  52#define EXT2_MAX_BLOCK_SIZE     (1 << EXT2_MAX_BLOCK_LOG_SIZE)
  53#define EXT2_BLOCK_SIZE(s)      (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  54#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
  55#define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  56                                 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
  57#define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  58                                 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
  59#define EXT2_ADDR_PER_BLOCK(s)  (EXT2_BLOCK_SIZE(s) / sizeof(uint32_t))
  60
  61/*
  62 * Macro-instructions used to manage fragments
  63 */
  64#define EXT2_MIN_FRAG_SIZE              EXT2_MIN_BLOCK_SIZE
  65#define EXT2_MAX_FRAG_SIZE              EXT2_MAX_BLOCK_SIZE
  66#define EXT2_MIN_FRAG_LOG_SIZE          EXT2_MIN_BLOCK_LOG_SIZE
  67#define EXT2_FRAG_SIZE(s)               (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
  68#define EXT2_FRAGS_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
  69
  70/*
  71 * ACL structures
  72 */
  73struct ext2_acl_header {        /* Header of Access Control Lists */
  74        uint32_t        aclh_size;
  75        uint32_t        aclh_file_count;
  76        uint32_t        aclh_acle_count;
  77        uint32_t        aclh_first_acle;
  78};
  79
  80struct ext2_acl_entry { /* Access Control List Entry */
  81        uint32_t        acle_size;
  82        uint16_t        acle_perms;     /* Access permissions */
  83        uint16_t        acle_type;      /* Type of entry */
  84        uint16_t        acle_tag;       /* User or group identity */
  85        uint16_t        acle_pad1;
  86        uint32_t        acle_next;      /* Pointer on next entry for the */
  87                                        /* same inode or on next free entry */
  88};
  89
  90/*
  91 * Structure of a blocks group descriptor
  92 */
  93struct ext2_group_desc {
  94        uint32_t        bg_block_bitmap;        /* Blocks bitmap block */
  95        uint32_t        bg_inode_bitmap;        /* Inodes bitmap block */
  96        uint32_t        bg_inode_table;         /* Inodes table block */
  97        uint16_t        bg_free_blocks_count;   /* Free blocks count */
  98        uint16_t        bg_free_inodes_count;   /* Free inodes count */
  99        uint16_t        bg_used_dirs_count;     /* Directories count */
 100        uint16_t        bg_pad;
 101        uint32_t        bg_reserved[3];
 102};
 103
 104/*
 105 * Data structures used by the directory indexing feature
 106 *
 107 * Note: all of the multibyte integer fields are little endian.
 108 */
 109
 110/*
 111 * Note: dx_root_info is laid out so that if it should somehow get
 112 * overlaid by a dirent the two low bits of the hash version will be
 113 * zero.  Therefore, the hash version mod 4 should never be 0.
 114 * Sincerely, the paranoia department.
 115 */
 116struct ext2_dx_root_info {
 117        uint32_t        reserved_zero;
 118        uint8_t         hash_version; /* 0 now, 1 at release */
 119        uint8_t         info_length; /* 8 */
 120        uint8_t         indirect_levels;
 121        uint8_t         unused_flags;
 122};
 123
 124#define EXT2_HASH_LEGACY        0
 125#define EXT2_HASH_HALF_MD4      1
 126#define EXT2_HASH_TEA           2
 127
 128#define EXT2_HASH_FLAG_INCOMPAT 0x1
 129
 130struct ext2_dx_entry {
 131        uint32_t hash;
 132        uint32_t block;
 133};
 134
 135struct ext2_dx_countlimit {
 136        uint16_t limit;
 137        uint16_t count;
 138};
 139
 140
 141/*
 142 * Macro-instructions used to manage group descriptors
 143 */
 144#define EXT2_BLOCKS_PER_GROUP(s)        (EXT2_SB(s)->s_blocks_per_group)
 145#define EXT2_INODES_PER_GROUP(s)        (EXT2_SB(s)->s_inodes_per_group)
 146#define EXT2_INODES_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
 147/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
 148#define EXT2_MAX_BLOCKS_PER_GROUP(s)    ((1 << 16) - 8)
 149#define EXT2_MAX_INODES_PER_GROUP(s)    ((1 << 16) - EXT2_INODES_PER_BLOCK(s))
 150#define EXT2_DESC_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 151
 152/*
 153 * Constants relative to the data blocks
 154 */
 155#define EXT2_NDIR_BLOCKS                12
 156#define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 157#define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 158#define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 159#define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 160
 161/*
 162 * Inode flags
 163 */
 164#define EXT2_SECRM_FL                   0x00000001 /* Secure deletion */
 165#define EXT2_UNRM_FL                    0x00000002 /* Undelete */
 166#define EXT2_COMPR_FL                   0x00000004 /* Compress file */
 167#define EXT2_SYNC_FL                    0x00000008 /* Synchronous updates */
 168#define EXT2_IMMUTABLE_FL               0x00000010 /* Immutable file */
 169#define EXT2_APPEND_FL                  0x00000020 /* writes to file may only append */
 170#define EXT2_NODUMP_FL                  0x00000040 /* do not dump file */
 171#define EXT2_NOATIME_FL                 0x00000080 /* do not update atime */
 172/* Reserved for compression usage... */
 173#define EXT2_DIRTY_FL                   0x00000100
 174#define EXT2_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 175#define EXT2_NOCOMPR_FL                 0x00000400 /* Access raw compressed data */
 176#define EXT2_ECOMPR_FL                  0x00000800 /* Compression error */
 177/* End compression flags --- maybe not all used */
 178#define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 179#define EXT2_INDEX_FL                   0x00001000 /* hash-indexed directory */
 180#define EXT2_IMAGIC_FL                  0x00002000
 181#define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */
 182#define EXT2_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 183#define EXT2_DIRSYNC_FL                 0x00010000 /* Synchronous directory modifications */
 184#define EXT2_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
 185#define EXT3_EXTENTS_FL                 0x00080000 /* Inode uses extents */
 186#define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 187
 188#define EXT2_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */
 189#define EXT2_FL_USER_MODIFIABLE         0x000080FF /* User modifiable flags */
 190
 191/*
 192 * ioctl commands
 193 */
 194#define EXT2_IOC_GETFLAGS               _IOR('f', 1, long)
 195#define EXT2_IOC_SETFLAGS               _IOW('f', 2, long)
 196#define EXT2_IOC_GETVERSION             _IOR('v', 1, long)
 197#define EXT2_IOC_SETVERSION             _IOW('v', 2, long)
 198
 199/*
 200 * Structure of an inode on the disk
 201 */
 202struct ext2_inode {
 203        uint16_t        i_mode;         /* File mode */
 204        uint16_t        i_uid;          /* Low 16 bits of Owner Uid */
 205        uint32_t        i_size;         /* Size in bytes */
 206        uint32_t        i_atime;        /* Access time */
 207        uint32_t        i_ctime;        /* Creation time */
 208        uint32_t        i_mtime;        /* Modification time */
 209        uint32_t        i_dtime;        /* Deletion Time */
 210        uint16_t        i_gid;          /* Low 16 bits of Group Id */
 211        uint16_t        i_links_count;  /* Links count */
 212        uint32_t        i_blocks;       /* Blocks count */
 213        uint32_t        i_flags;        /* File flags */
 214        union {
 215                struct {
 216                        uint32_t  l_i_reserved1;
 217                } linux1;
 218                struct {
 219                        uint32_t  h_i_translator;
 220                } hurd1;
 221                struct {
 222                        uint32_t  m_i_reserved1;
 223                } masix1;
 224        } osd1;                         /* OS dependent 1 */
 225        uint32_t        i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 226        uint32_t        i_generation;   /* File version (for NFS) */
 227        uint32_t        i_file_acl;     /* File ACL */
 228        uint32_t        i_dir_acl;      /* Directory ACL */
 229        uint32_t        i_faddr;        /* Fragment address */
 230        union {
 231                struct {
 232                        uint8_t         l_i_frag;       /* Fragment number */
 233                        uint8_t         l_i_fsize;      /* Fragment size */
 234                        uint16_t        i_pad1;
 235                        uint16_t        l_i_uid_high;   /* these 2 fields    */
 236                        uint16_t        l_i_gid_high;   /* were reserved2[0] */
 237                        uint32_t        l_i_reserved2;
 238                } linux2;
 239                struct {
 240                        uint8_t         h_i_frag;       /* Fragment number */
 241                        uint8_t         h_i_fsize;      /* Fragment size */
 242                        uint16_t        h_i_mode_high;
 243                        uint16_t        h_i_uid_high;
 244                        uint16_t        h_i_gid_high;
 245                        uint32_t        h_i_author;
 246                } hurd2;
 247                struct {
 248                        uint8_t         m_i_frag;       /* Fragment number */
 249                        uint8_t         m_i_fsize;      /* Fragment size */
 250                        uint16_t        m_pad1;
 251                        uint32_t        m_i_reserved2[2];
 252                } masix2;
 253        } osd2;                         /* OS dependent 2 */
 254};
 255
 256/*
 257 * Permanent part of an large inode on the disk
 258 */
 259struct ext2_inode_large {
 260        uint16_t        i_mode;         /* File mode */
 261        uint16_t        i_uid;          /* Low 16 bits of Owner Uid */
 262        uint32_t        i_size;         /* Size in bytes */
 263        uint32_t        i_atime;        /* Access time */
 264        uint32_t        i_ctime;        /* Creation time */
 265        uint32_t        i_mtime;        /* Modification time */
 266        uint32_t        i_dtime;        /* Deletion Time */
 267        uint16_t        i_gid;          /* Low 16 bits of Group Id */
 268        uint16_t        i_links_count;  /* Links count */
 269        uint32_t        i_blocks;       /* Blocks count */
 270        uint32_t        i_flags;        /* File flags */
 271        union {
 272                struct {
 273                        uint32_t  l_i_reserved1;
 274                } linux1;
 275                struct {
 276                        uint32_t  h_i_translator;
 277                } hurd1;
 278                struct {
 279                        uint32_t  m_i_reserved1;
 280                } masix1;
 281        } osd1;                         /* OS dependent 1 */
 282        uint32_t        i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 283        uint32_t        i_generation;   /* File version (for NFS) */
 284        uint32_t        i_file_acl;     /* File ACL */
 285        uint32_t        i_dir_acl;      /* Directory ACL */
 286        uint32_t        i_faddr;        /* Fragment address */
 287        union {
 288                struct {
 289                        uint8_t         l_i_frag;       /* Fragment number */
 290                        uint8_t         l_i_fsize;      /* Fragment size */
 291                        uint16_t        i_pad1;
 292                        uint16_t        l_i_uid_high;   /* these 2 fields    */
 293                        uint16_t        l_i_gid_high;   /* were reserved2[0] */
 294                        uint32_t        l_i_reserved2;
 295                } linux2;
 296                struct {
 297                        uint8_t         h_i_frag;       /* Fragment number */
 298                        uint8_t         h_i_fsize;      /* Fragment size */
 299                        uint16_t        h_i_mode_high;
 300                        uint16_t        h_i_uid_high;
 301                        uint16_t        h_i_gid_high;
 302                        uint32_t        h_i_author;
 303                } hurd2;
 304                struct {
 305                        uint8_t         m_i_frag;       /* Fragment number */
 306                        uint8_t         m_i_fsize;      /* Fragment size */
 307                        uint16_t        m_pad1;
 308                        uint32_t        m_i_reserved2[2];
 309                } masix2;
 310        } osd2;                         /* OS dependent 2 */
 311        uint16_t        i_extra_isize;
 312        uint16_t        i_pad1;
 313};
 314
 315#define i_size_high     i_dir_acl
 316
 317/*
 318 * File system states
 319 */
 320#define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 321#define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 322
 323/*
 324 * Mount flags
 325 */
 326#define EXT2_MOUNT_CHECK                0x0001  /* Do mount-time checks */
 327#define EXT2_MOUNT_GRPID                0x0004  /* Create files with directory's group */
 328#define EXT2_MOUNT_DEBUG                0x0008  /* Some debugging messages */
 329#define EXT2_MOUNT_ERRORS_CONT          0x0010  /* Continue on errors */
 330#define EXT2_MOUNT_ERRORS_RO            0x0020  /* Remount fs ro on errors */
 331#define EXT2_MOUNT_ERRORS_PANIC         0x0040  /* Panic on errors */
 332#define EXT2_MOUNT_MINIX_DF             0x0080  /* Mimics the Minix statfs */
 333#define EXT2_MOUNT_NO_UID32             0x0200  /* Disable 32-bit UIDs */
 334
 335#define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 336#define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 337#define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
 338                                         EXT2_MOUNT_##opt)
 339/*
 340 * Maximal mount counts between two filesystem checks
 341 */
 342#define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 343#define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 344
 345/*
 346 * Behaviour when detecting errors
 347 */
 348#define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 349#define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 350#define EXT2_ERRORS_PANIC               3       /* Panic */
 351#define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 352
 353/*
 354 * Structure of the super block
 355 */
 356struct ext2_super_block {
 357        uint32_t        s_inodes_count;         /* Inodes count */
 358        uint32_t        s_blocks_count;         /* Blocks count */
 359        uint32_t        s_r_blocks_count;       /* Reserved blocks count */
 360        uint32_t        s_free_blocks_count;    /* Free blocks count */
 361        uint32_t        s_free_inodes_count;    /* Free inodes count */
 362        uint32_t        s_first_data_block;     /* First Data Block */
 363        uint32_t        s_log_block_size;       /* Block size */
 364        int32_t         s_log_frag_size;        /* Fragment size */
 365        uint32_t        s_blocks_per_group;     /* # Blocks per group */
 366        uint32_t        s_frags_per_group;      /* # Fragments per group */
 367        uint32_t        s_inodes_per_group;     /* # Inodes per group */
 368        uint32_t        s_mtime;                /* Mount time */
 369        uint32_t        s_wtime;                /* Write time */
 370        uint16_t        s_mnt_count;            /* Mount count */
 371        int16_t         s_max_mnt_count;        /* Maximal mount count */
 372        uint16_t        s_magic;                /* Magic signature */
 373        uint16_t        s_state;                /* File system state */
 374        uint16_t        s_errors;               /* Behaviour when detecting errors */
 375        uint16_t        s_minor_rev_level;      /* minor revision level */
 376        uint32_t        s_lastcheck;            /* time of last check */
 377        uint32_t        s_checkinterval;        /* max. time between checks */
 378        uint32_t        s_creator_os;           /* OS */
 379        uint32_t        s_rev_level;            /* Revision level */
 380        uint16_t        s_def_resuid;           /* Default uid for reserved blocks */
 381        uint16_t        s_def_resgid;           /* Default gid for reserved blocks */
 382        /*
 383         * These fields are for EXT2_DYNAMIC_REV superblocks only.
 384         *
 385         * Note: the difference between the compatible feature set and
 386         * the incompatible feature set is that if there is a bit set
 387         * in the incompatible feature set that the kernel doesn't
 388         * know about, it should refuse to mount the filesystem.
 389         *
 390         * e2fsck's requirements are more strict; if it doesn't know
 391         * about a feature in either the compatible or incompatible
 392         * feature set, it must abort and not try to meddle with
 393         * things it doesn't understand...
 394         */
 395        uint32_t        s_first_ino;            /* First non-reserved inode */
 396        uint16_t        s_inode_size;           /* size of inode structure */
 397        uint16_t        s_block_group_nr;       /* block group # of this superblock */
 398        uint32_t        s_feature_compat;       /* compatible feature set */
 399        uint32_t        s_feature_incompat;     /* incompatible feature set */
 400        uint32_t        s_feature_ro_compat;    /* readonly-compatible feature set */
 401        uint8_t         s_uuid[16];             /* 128-bit uuid for volume */
 402        char            s_volume_name[16];      /* volume name */
 403        char            s_last_mounted[64];     /* directory where last mounted */
 404        uint32_t        s_algorithm_usage_bitmap; /* For compression */
 405        /*
 406         * Performance hints.  Directory preallocation should only
 407         * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 408         */
 409        uint8_t         s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 410        uint8_t         s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 411        uint16_t        s_reserved_gdt_blocks;  /* Per group table for online growth */
 412        /*
 413         * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
 414         */
 415/*D0*/  uint8_t         s_journal_uuid[16];     /* uuid of journal superblock */
 416/*E0*/  uint32_t        s_journal_inum;         /* inode number of journal file */
 417        uint32_t        s_journal_dev;          /* device number of journal file */
 418        uint32_t        s_last_orphan;          /* start of list of inodes to delete */
 419        uint32_t        s_hash_seed[4];         /* HTREE hash seed */
 420        uint8_t         s_def_hash_version;     /* Default hash version to use */
 421        uint8_t         s_jnl_backup_type;      /* Default type of journal backup */
 422        uint16_t        s_reserved_word_pad;
 423/*100*/ uint32_t        s_default_mount_opts;
 424        uint32_t        s_first_meta_bg;        /* First metablock group */
 425        /* ext3 additions */
 426        uint32_t        s_mkfs_time;            /* When the filesystem was created */
 427        uint32_t        s_jnl_blocks[17];       /* Backup of the journal inode */
 428        /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
 429/*150*/ uint32_t        s_blocks_count_hi;      /* Blocks count */
 430        uint32_t        s_r_blocks_count_hi;    /* Reserved blocks count */
 431        uint32_t        s_free_blocks_count_hi; /* Free blocks count */
 432        uint16_t        s_min_extra_isize;      /* All inodes have at least # bytes */
 433        uint16_t        s_want_extra_isize;     /* New inodes should reserve # bytes */
 434        uint32_t        s_flags;                /* Miscellaneous flags */
 435        uint16_t        s_raid_stride;          /* RAID stride */
 436        uint16_t        s_mmp_interval;         /* # seconds to wait in MMP checking */
 437        uint64_t        s_mmp_block;            /* Block for multi-mount protection */
 438        uint32_t        s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/
 439        uint8_t         s_log_groups_per_flex;  /* FLEX_BG group size */
 440        uint8_t         s_reserved_char_pad2;
 441        uint16_t        s_reserved_pad;
 442        uint32_t        s_reserved[162];        /* Padding to the end of the block */
 443};
 444struct BUG_ext2_super_block {
 445        char bug[sizeof(struct ext2_super_block) == 1024 ? 1 : -1];
 446};
 447
 448/*
 449 * Codes for operating systems
 450 */
 451#define EXT2_OS_LINUX           0
 452#define EXT2_OS_HURD            1
 453#define EXT2_OS_MASIX           2
 454#define EXT2_OS_FREEBSD         3
 455#define EXT2_OS_LITES           4
 456
 457/*
 458 * Revision levels
 459 */
 460#define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 461#define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 462
 463#define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 464#define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 465
 466#define EXT2_GOOD_OLD_INODE_SIZE 128
 467
 468/*
 469 * Journal inode backup types
 470 */
 471#define EXT3_JNL_BACKUP_BLOCKS  1
 472
 473/*
 474 * Feature set definitions
 475 */
 476
 477#define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 478        ( EXT2_SB(sb)->s_feature_compat & (mask) )
 479#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 480        ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
 481#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 482        ( EXT2_SB(sb)->s_feature_incompat & (mask) )
 483
 484/* for s_feature_compat */
 485#define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 486#define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 487#define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 488#define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
 489#define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
 490#define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
 491
 492/* for s_feature_ro_compat */
 493#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 494#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 495#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004 /* not used */
 496#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE        0x0008
 497#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010
 498#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020
 499#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040
 500
 501/* for s_feature_incompat */
 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 EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040
 508#define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
 509#define EXT4_FEATURE_INCOMPAT_MMP               0x0100
 510#define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200
 511
 512
 513#define EXT2_FEATURE_COMPAT_SUPP        0
 514#define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 515                                         EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 516                                         EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 517#define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE| \
 518                                         EXT2_FEATURE_INCOMPAT_META_BG)
 519#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED       (~EXT2_FEATURE_INCOMPAT_SUPP)
 520#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED      (~EXT2_FEATURE_RO_COMPAT_SUPP)
 521
 522#define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 523                                         EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 524                                         EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 525#define EXT3_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE| \
 526                                         EXT3_FEATURE_INCOMPAT_RECOVER| \
 527                                         EXT2_FEATURE_INCOMPAT_META_BG)
 528#define EXT3_FEATURE_INCOMPAT_UNSUPPORTED       (~EXT3_FEATURE_INCOMPAT_SUPP)
 529#define EXT3_FEATURE_RO_COMPAT_UNSUPPORTED      (~EXT3_FEATURE_RO_COMPAT_SUPP)
 530
 531
 532/*
 533 * Default values for user and/or group using reserved blocks
 534 */
 535#define EXT2_DEF_RESUID         0
 536#define EXT2_DEF_RESGID         0
 537
 538/*
 539 * Default mount options
 540 */
 541#define EXT2_DEFM_DEBUG         0x0001
 542#define EXT2_DEFM_BSDGROUPS     0x0002
 543#define EXT2_DEFM_XATTR_USER    0x0004
 544#define EXT2_DEFM_ACL           0x0008
 545#define EXT2_DEFM_UID16         0x0010
 546#define EXT3_DEFM_JMODE         0x0060
 547#define EXT3_DEFM_JMODE_DATA    0x0020
 548#define EXT3_DEFM_JMODE_ORDERED 0x0040
 549#define EXT3_DEFM_JMODE_WBACK   0x0060
 550
 551/*
 552 * Structure of a directory entry
 553 */
 554#define EXT2_NAME_LEN 255
 555
 556struct ext2_dir_entry {
 557        uint32_t        inode;                  /* Inode number */
 558        uint16_t        rec_len;                /* Directory entry length */
 559        uint16_t        name_len;               /* Name length */
 560        char            name[EXT2_NAME_LEN];    /* File name */
 561};
 562
 563/*
 564 * The new version of the directory entry.  Since EXT2 structures are
 565 * stored in intel byte order, and the name_len field could never be
 566 * bigger than 255 chars, it's safe to reclaim the extra byte for the
 567 * file_type field.
 568 */
 569struct ext2_dir_entry_2 {
 570        uint32_t        inode;                  /* Inode number */
 571        uint16_t        rec_len;                /* Directory entry length */
 572        uint8_t         name_len;               /* Name length */
 573        uint8_t         file_type;
 574        char            name[EXT2_NAME_LEN];    /* File name */
 575};
 576
 577/*
 578 * Ext2 directory file types.  Only the low 3 bits are used.  The
 579 * other bits are reserved for now.
 580 */
 581#define EXT2_FT_UNKNOWN         0
 582#define EXT2_FT_REG_FILE        1
 583#define EXT2_FT_DIR             2
 584#define EXT2_FT_CHRDEV          3
 585#define EXT2_FT_BLKDEV          4
 586#define EXT2_FT_FIFO            5
 587#define EXT2_FT_SOCK            6
 588#define EXT2_FT_SYMLINK         7
 589
 590#define EXT2_FT_MAX             8
 591
 592/*
 593 * EXT2_DIR_PAD defines the directory entries boundaries
 594 *
 595 * NOTE: It must be a multiple of 4
 596 */
 597#define EXT2_DIR_PAD                    4
 598#define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 599#define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 600                                         ~EXT2_DIR_ROUND)
 601
 602#endif
 603