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
  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>
  70static 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 */
 133struct 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. */
 211static 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 */
 242struct 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 */
 373struct 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
 542struct 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 */
 555struct 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 */
 567enum {
 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 */
 591