LXR linux/include/linux/ext2

   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>
  71static 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 */
 134struct 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. */
 212static 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 */
 243struct 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 */
 374struct 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
 543struct 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 */
 556struct 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 */
 568enum {
 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 */
 592