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 <asm/types.h>          /* Changed from linux/types.h */
  20
  21 /*
  22  * The second extended filesystem constants/structures
  23  */
  24
  25 /*
  26  * Define EXT2FS_DEBUG to produce debug messages
  27  */
  28 #undef EXT2FS_DEBUG
  29
  30 /*
  31  * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
  32  */
  33 #define EXT2_PREALLOCATE
  34 #define EXT2_DEFAULT_PREALLOC_BLOCKS    8
  35
  36 /*
  37  * The second extended file system version
  38  */
  39 #define EXT2FS_DATE             "95/08/09"
  40 #define EXT2FS_VERSION          "0.5b"
  41
  42 /*
  43  * Special inodes numbers
  44  */
  45 #define EXT2_BAD_INO             1      /* Bad blocks inode */
  46 #define EXT2_ROOT_INO            2      /* Root inode */
  47 #define EXT2_ACL_IDX_INO         3      /* ACL inode */
  48 #define EXT2_ACL_DATA_INO        4      /* ACL inode */
  49 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
  50 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
  51
  52 /* First non-reserved inode for old ext2 filesystems */
  53 #define EXT2_GOOD_OLD_FIRST_INO 11
  54
  55 /*
  56  * The second extended file system magic number
  57  */
  58 #define EXT2_SUPER_MAGIC        0xEF53
  59
  60 /*
  61  * Maximal count of links to a file
  62  */
  63 #define EXT2_LINK_MAX           32000
  64
  65 /*
  66  * Macro-instructions used to manage several block sizes
  67  */
  68 #define EXT2_MIN_BLOCK_SIZE             1024
  69 #define EXT2_MAX_BLOCK_SIZE             4096
  70 #define EXT2_MIN_BLOCK_LOG_SIZE           10
  71 #ifdef __KERNEL__
  72 # define EXT2_BLOCK_SIZE(s)             ((s)->s_blocksize)
  73 #else
  74 # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
  75 #endif
  76 #define EXT2_ACLE_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
  77 #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
  78 #ifdef __KERNEL__
  79 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
  80 #else
  81 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
  82 #endif
  83 #ifdef __KERNEL__
  84 #define EXT2_ADDR_PER_BLOCK_BITS(s)     ((s)->u.ext2_sb.s_addr_per_block_bits)
  85 #define EXT2_INODE_SIZE(s)              ((s)->u.ext2_sb.s_inode_size)
  86 #define EXT2_FIRST_INO(s)               ((s)->u.ext2_sb.s_first_ino)
  87 #else
  88 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  89                                  EXT2_GOOD_OLD_INODE_SIZE : \
  90                                  (s)->s_inode_size)
  91 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
  92                                  EXT2_GOOD_OLD_FIRST_INO : \
  93                                  (s)->s_first_ino)
  94 #endif
  95
  96 /*
  97  * Macro-instructions used to manage fragments
  98  */
  99 #define EXT2_MIN_FRAG_SIZE              1024
 100 #define EXT2_MAX_FRAG_SIZE              4096
 101 #define EXT2_MIN_FRAG_LOG_SIZE            10
 102 #ifdef __KERNEL__
 103 # define EXT2_FRAG_SIZE(s)              ((s)->u.ext2_sb.s_frag_size)
 104 # define EXT2_FRAGS_PER_BLOCK(s)        ((s)->u.ext2_sb.s_frags_per_block)
 105 #else
 106 # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 107 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
 108 #endif
 109
 110 /*
 111  * ACL structures
 112  */
 113 struct ext2_acl_header  /* Header of Access Control Lists */
 114 {
 115         __u32   aclh_size;
 116         __u32   aclh_file_count;
 117         __u32   aclh_acle_count;
 118         __u32   aclh_first_acle;
 119 };
 120
 121 struct ext2_acl_entry   /* Access Control List Entry */
 122 {
 123         __u32   acle_size;
 124         __u16   acle_perms;     /* Access permissions */
 125         __u16   acle_type;      /* Type of entry */
 126         __u16   acle_tag;       /* User or group identity */
 127         __u16   acle_pad1;
 128         __u32   acle_next;      /* Pointer on next entry for the */
 129                                         /* same inode or on next free entry */
 130 };
 131
 132 /*
 133  * Structure of a blocks group descriptor
 134  */
 135 struct ext2_group_desc
 136 {
 137         __u32   bg_block_bitmap;                /* Blocks bitmap block */
 138         __u32   bg_inode_bitmap;                /* Inodes bitmap block */
 139         __u32   bg_inode_table;         /* Inodes table block */
 140         __u16   bg_free_blocks_count;   /* Free blocks count */
 141         __u16   bg_free_inodes_count;   /* Free inodes count */
 142         __u16   bg_used_dirs_count;     /* Directories count */
 143         __u16   bg_pad;
 144         __u32   bg_reserved[3];
 145 };
 146
 147 /*
 148  * Macro-instructions used to manage group descriptors
 149  */
 150 #ifdef __KERNEL__
 151 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->u.ext2_sb.s_blocks_per_group)
 152 # define EXT2_DESC_PER_BLOCK(s)         ((s)->u.ext2_sb.s_desc_per_block)
 153 # define EXT2_INODES_PER_GROUP(s)       ((s)->u.ext2_sb.s_inodes_per_group)
 154 # define EXT2_DESC_PER_BLOCK_BITS(s)    ((s)->u.ext2_sb.s_desc_per_block_bits)
 155 #else
 156 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
 157 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 158 # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
 159 #endif
 160
 161 /*
 162  * Constants relative to the data blocks
 163  */
 164 #define EXT2_NDIR_BLOCKS                12
 165 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
 166 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
 167 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
 168 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
 169
 170 /*
 171  * Inode flags
 172  */
 173 #define EXT2_SECRM_FL                   0x00000001 /* Secure deletion */
 174 #define EXT2_UNRM_FL                    0x00000002 /* Undelete */
 175 #define EXT2_COMPR_FL                   0x00000004 /* Compress file */
 176 #define EXT2_SYNC_FL                    0x00000008 /* Synchronous updates */
 177 #define EXT2_IMMUTABLE_FL               0x00000010 /* Immutable file */
 178 #define EXT2_APPEND_FL                  0x00000020 /* writes to file may only append */
 179 #define EXT2_NODUMP_FL                  0x00000040 /* do not dump file */
 180 #define EXT2_NOATIME_FL                 0x00000080 /* do not update atime */
 181 /* Reserved for compression usage... */
 182 #define EXT2_DIRTY_FL                   0x00000100
 183 #define EXT2_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */
 184 #define EXT2_NOCOMPR_FL                 0x00000400 /* Access raw compressed data */
 185 #define EXT2_ECOMPR_FL                  0x00000800 /* Compression error */
 186 /* End compression flags --- maybe not all used */
 187 #define EXT2_BTREE_FL                   0x00001000 /* btree format dir */
 188 #define EXT2_IMAGIC_FL                  0x00002000
 189 #define EXT2_RESERVED_FL                0x80000000 /* reserved for ext2 lib */
 190
 191 #define EXT2_FL_USER_VISIBLE            0x00001FFF /* User visible flags */
 192 #define EXT2_FL_USER_MODIFIABLE         0x000000FF /* User modifiable flags */
 193
 194 /*
 195  * ioctl commands
 196  */
 197 #define EXT2_IOC_GETFLAGS               _IOR('f', 1, long)
 198 #define EXT2_IOC_SETFLAGS               _IOW('f', 2, long)
 199 #define EXT2_IOC_GETVERSION             _IOR('v', 1, long)
 200 #define EXT2_IOC_SETVERSION             _IOW('v', 2, long)
 201
 202 /*
 203  * Structure of an inode on the disk
 204  */
 205 struct ext2_inode {
 206         __u16   i_mode;         /* File mode */
 207         __u16   i_uid;          /* Low 16 bits of Owner Uid */
 208         __u32   i_size;         /* Size in bytes */
 209         __u32   i_atime;        /* Access time */
 210         __u32   i_ctime;        /* Creation time */
 211         __u32   i_mtime;        /* Modification time */
 212         __u32   i_dtime;        /* Deletion Time */
 213         __u16   i_gid;          /* Low 16 bits of Group Id */
 214         __u16   i_links_count;  /* Links count */
 215         __u32   i_blocks;       /* Blocks count */
 216         __u32   i_flags;        /* File flags */
 217         union {
 218                 struct {
 219                         __u32  l_i_reserved1;
 220                 } linux1;
 221                 struct {
 222                         __u32  h_i_translator;
 223                 } hurd1;
 224                 struct {
 225                         __u32  m_i_reserved1;
 226                 } masix1;
 227         } osd1;                         /* OS dependent 1 */
 228         __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 229         __u32   i_generation;   /* File version (for NFS) */
 230         __u32   i_file_acl;     /* File ACL */
 231         __u32   i_dir_acl;      /* Directory ACL */
 232         __u32   i_faddr;        /* Fragment address */
 233         union {
 234                 struct {
 235                         __u8    l_i_frag;       /* Fragment number */
 236                         __u8    l_i_fsize;      /* Fragment size */
 237                         __u16   i_pad1;
 238                         __u16   l_i_uid_high;   /* these 2 fields    */
 239                         __u16   l_i_gid_high;   /* were reserved2[0] */
 240                         __u32   l_i_reserved2;
 241                 } linux2;
 242                 struct {
 243                         __u8    h_i_frag;       /* Fragment number */
 244                         __u8    h_i_fsize;      /* Fragment size */
 245                         __u16   h_i_mode_high;
 246                         __u16   h_i_uid_high;
 247                         __u16   h_i_gid_high;
 248                         __u32   h_i_author;
 249                 } hurd2;
 250                 struct {
 251                         __u8    m_i_frag;       /* Fragment number */
 252                         __u8    m_i_fsize;      /* Fragment size */
 253                         __u16   m_pad1;
 254                         __u32   m_i_reserved2[2];
 255                 } masix2;
 256         } osd2;                         /* OS dependent 2 */
 257 };
 258
 259 #define i_size_high     i_dir_acl
 260
 261 #if defined(__KERNEL__) || defined(__linux__)
 262 #define i_reserved1     osd1.linux1.l_i_reserved1
 263 #define i_frag          osd2.linux2.l_i_frag
 264 #define i_fsize         osd2.linux2.l_i_fsize
 265 #define i_uid_low       i_uid
 266 #define i_gid_low       i_gid
 267 #define i_uid_high      osd2.linux2.l_i_uid_high
 268 #define i_gid_high      osd2.linux2.l_i_gid_high
 269 #define i_reserved2     osd2.linux2.l_i_reserved2
 270
 271 #elif defined(__GNU__)
 272
 273 #define i_translator    osd1.hurd1.h_i_translator
 274 #define i_frag          osd2.hurd2.h_i_frag;
 275 #define i_fsize         osd2.hurd2.h_i_fsize;
 276 #define i_uid_high      osd2.hurd2.h_i_uid_high
 277 #define i_gid_high      osd2.hurd2.h_i_gid_high
 278 #define i_author        osd2.hurd2.h_i_author
 279
 280 #elif defined(__masix__)
 281
 282 #define i_reserved1     osd1.masix1.m_i_reserved1
 283 #define i_frag          osd2.masix2.m_i_frag
 284 #define i_fsize         osd2.masix2.m_i_fsize
 285 #define i_reserved2     osd2.masix2.m_i_reserved2
 286
 287 #endif  /* defined(__KERNEL) || defined(__linux__) */
 288
 289 /*
 290  * File system states
 291  */
 292 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
 293 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
 294
 295 /*
 296  * Mount flags
 297  */
 298 #define EXT2_MOUNT_CHECK                0x0001  /* Do mount-time checks */
 299 #define EXT2_MOUNT_GRPID                0x0004  /* Create files with directory's group */
 300 #define EXT2_MOUNT_DEBUG                0x0008  /* Some debugging messages */
 301 #define EXT2_MOUNT_ERRORS_CONT          0x0010  /* Continue on errors */
 302 #define EXT2_MOUNT_ERRORS_RO            0x0020  /* Remount fs ro on errors */
 303 #define EXT2_MOUNT_ERRORS_PANIC         0x0040  /* Panic on errors */
 304 #define EXT2_MOUNT_MINIX_DF             0x0080  /* Mimics the Minix statfs */
 305 #define EXT2_MOUNT_NO_UID32             0x0200  /* Disable 32-bit UIDs */
 306
 307 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
 308 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
 309 #define test_opt(sb, opt)               ((sb)->u.ext2_sb.s_mount_opt & \
 310                                          EXT2_MOUNT_##opt)
 311 /*
 312  * Maximal mount counts between two filesystem checks
 313  */
 314 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
 315 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
 316
 317 /*
 318  * Behaviour when detecting errors
 319  */
 320 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
 321 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
 322 #define EXT2_ERRORS_PANIC               3       /* Panic */
 323 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
 324
 325 /*
 326  * Structure of the super block
 327  */
 328 struct ext2_super_block {
 329         __u32   s_inodes_count;         /* Inodes count */
 330         __u32   s_blocks_count;         /* Blocks count */
 331         __u32   s_r_blocks_count;       /* Reserved blocks count */
 332         __u32   s_free_blocks_count;    /* Free blocks count */
 333         __u32   s_free_inodes_count;    /* Free inodes count */
 334         __u32   s_first_data_block;     /* First Data Block */
 335         __u32   s_log_block_size;       /* Block size */
 336         __s32   s_log_frag_size;        /* Fragment size */
 337         __u32   s_blocks_per_group;     /* # Blocks per group */
 338         __u32   s_frags_per_group;      /* # Fragments per group */
 339         __u32   s_inodes_per_group;     /* # Inodes per group */
 340         __u32   s_mtime;                /* Mount time */
 341         __u32   s_wtime;                /* Write time */
 342         __u16   s_mnt_count;            /* Mount count */
 343         __s16   s_max_mnt_count;        /* Maximal mount count */
 344         __u16   s_magic;                /* Magic signature */
 345         __u16   s_state;                /* File system state */
 346         __u16   s_errors;               /* Behaviour when detecting errors */
 347         __u16   s_minor_rev_level;      /* minor revision level */
 348         __u32   s_lastcheck;            /* time of last check */
 349         __u32   s_checkinterval;        /* max. time between checks */
 350         __u32   s_creator_os;           /* OS */
 351         __u32   s_rev_level;            /* Revision level */
 352         __u16   s_def_resuid;           /* Default uid for reserved blocks */
 353         __u16   s_def_resgid;           /* Default gid for reserved blocks */
 354         /*
 355          * These fields are for EXT2_DYNAMIC_REV superblocks only.
 356          *
 357          * Note: the difference between the compatible feature set and
 358          * the incompatible feature set is that if there is a bit set
 359          * in the incompatible feature set that the kernel doesn't
 360          * know about, it should refuse to mount the filesystem.
 361          *
 362          * e2fsck's requirements are more strict; if it doesn't know
 363          * about a feature in either the compatible or incompatible
 364          * feature set, it must abort and not try to meddle with
 365          * things it doesn't understand...
 366          */
 367         __u32   s_first_ino;            /* First non-reserved inode */
 368         __u16   s_inode_size;           /* size of inode structure */
 369         __u16   s_block_group_nr;       /* block group # of this superblock */
 370         __u32   s_feature_compat;       /* compatible feature set */
 371         __u32   s_feature_incompat;     /* incompatible feature set */
 372         __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
 373         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 374         char    s_volume_name[16];      /* volume name */
 375         char    s_last_mounted[64];     /* directory where last mounted */
 376         __u32   s_algorithm_usage_bitmap; /* For compression */
 377         /*
 378          * Performance hints.  Directory preallocation should only
 379          * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
 380          */
 381         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
 382         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
 383         __u16   s_padding1;
 384         /*
 385          * Journaling support.
 386          */
 387         __u8    s_journal_uuid[16];     /* uuid of journal superblock */
 388         __u32   s_journal_inum;         /* inode number of journal file */
 389         __u32   s_journal_dev;          /* device number of journal file */
 390         __u32   s_last_orphan;          /* start of list of inodes to delete */
 391
 392         __u32   s_reserved[197];        /* Padding to the end of the block */
 393 };
 394
 395 #ifdef __KERNEL__
 396 #define EXT2_SB(sb)     (&((sb)->u.ext2_sb))
 397 #else
 398 /* Assume that user mode programs are passing in an ext2fs superblock, not
 399  * a kernel struct super_block.  This will allow us to call the feature-test
 400  * macros from user land. */
 401 #define EXT2_SB(sb)     (sb)
 402 #endif
 403
 404 /*
 405  * Codes for operating systems
 406  */
 407 #define EXT2_OS_LINUX           0
 408 #define EXT2_OS_HURD            1
 409 #define EXT2_OS_MASIX           2
 410 #define EXT2_OS_FREEBSD         3
 411 #define EXT2_OS_LITES           4
 412
 413 /*
 414  * Revision levels
 415  */
 416 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
 417 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
 418
 419 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
 420 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
 421
 422 #define EXT2_GOOD_OLD_INODE_SIZE 128
 423
 424 /*
 425  * Feature set definitions
 426  */
 427
 428 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
 429         ( EXT2_SB(sb)->s_feature_compat & (mask) )
 430 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
 431         ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
 432 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
 433         ( EXT2_SB(sb)->s_feature_incompat & (mask) )
 434
 435 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
 436 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
 437 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
 438
 439 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
 440 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
 441 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
 442
 443 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
 444 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
 445 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */
 446
 447 #define EXT2_FEATURE_COMPAT_SUPP        0
 448 #define EXT2_FEATURE_INCOMPAT_SUPP      EXT2_FEATURE_INCOMPAT_FILETYPE
 449 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 450                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 451                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 452
 453 /*
 454  * Default values for user and/or group using reserved blocks
 455  */
 456 #define EXT2_DEF_RESUID         0
 457 #define EXT2_DEF_RESGID         0
 458
 459 /*
 460  * Structure of a directory entry
 461  */
 462 #define EXT2_NAME_LEN 255
 463
 464 struct ext2_dir_entry {
 465         __u32   inode;                  /* Inode number */
 466         __u16   rec_len;                /* Directory entry length */
 467         __u16   name_len;               /* Name length */
 468         char    name[EXT2_NAME_LEN];    /* File name */
 469 };
 470
 471 /*
 472  * The new version of the directory entry.  Since EXT2 structures are
 473  * stored in intel byte order, and the name_len field could never be
 474  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 475  * file_type field.
 476  */
 477 struct ext2_dir_entry_2 {
 478         __u32   inode;                  /* Inode number */
 479         __u16   rec_len;                /* Directory entry length */
 480         __u8    name_len;               /* Name length */
 481         __u8    file_type;
 482         char    name[EXT2_NAME_LEN];    /* File name */
 483 };
 484
 485 /*
 486  * Ext2 directory file types.  Only the low 3 bits are used.  The
 487  * other bits are reserved for now.
 488  */
 489 #define EXT2_FT_UNKNOWN         0
 490 #define EXT2_FT_REG_FILE        1
 491 #define EXT2_FT_DIR             2
 492 #define EXT2_FT_CHRDEV          3
 493 #define EXT2_FT_BLKDEV          4
 494 #define EXT2_FT_FIFO            5
 495 #define EXT2_FT_SOCK            6
 496 #define EXT2_FT_SYMLINK         7
 497
 498 #define EXT2_FT_MAX             8
 499
 500 /*
 501  * EXT2_DIR_PAD defines the directory entries boundaries
 502  *
 503  * NOTE: It must be a multiple of 4
 504  */
 505 #define EXT2_DIR_PAD                    4
 506 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
 507 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
 508                                          ~EXT2_DIR_ROUND)
 509
 510 #ifdef __KERNEL__
 511 /*
 512  * Function prototypes
 513  */
 514
 515 /*
 516  * Ok, these declarations are also in <linux/kernel.h> but none of the
 517  * ext2 source programs needs to include it so they are duplicated here.
 518  */
 519 # define NORET_TYPE    /**/
 520 # define ATTRIB_NORET  __attribute__((noreturn))
 521 # define NORET_AND     noreturn,
 522
 523 /* acl.c */
 524 extern int ext2_permission (struct inode *, int);
 525
 526 /* balloc.c */
 527 extern int ext2_group_sparse(int group);
 528 extern int ext2_new_block (const struct inode *, unsigned long,
 529                            __u32 *, __u32 *, int *);
 530 extern void ext2_free_blocks (const struct inode *, unsigned long,
 531                               unsigned long);
 532 extern unsigned long ext2_count_free_blocks (struct super_block *);
 533 extern void ext2_check_blocks_bitmap (struct super_block *);
 534 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
 535                                                     unsigned int block_group,
 536                                                     struct buffer_head ** bh);
 537
 538 /* bitmap.c */
 539 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
 540
 541 /* dir.c */
 542 extern int ext2_check_dir_entry (const char *, struct inode *,
 543                                  struct ext2_dir_entry_2 *, struct buffer_head *,
 544                                  unsigned long);
 545
 546 /* file.c */
 547 extern int ext2_read (struct inode *, struct file *, char *, int);
 548 extern int ext2_write (struct inode *, struct file *, char *, int);
 549
 550 /* fsync.c */
 551 extern int ext2_sync_file (struct file *, struct dentry *);
 552
 553 /* ialloc.c */
 554 extern struct inode * ext2_new_inode (const struct inode *, int, int *);
 555 extern void ext2_free_inode (struct inode *);
 556 extern unsigned long ext2_count_free_inodes (struct super_block *);
 557 extern void ext2_check_inodes_bitmap (struct super_block *);
 558
 559 /* inode.c */
 560 extern long ext2_bmap (struct inode *, long);
 561 extern int ext2_get_block (struct inode *, long, struct buffer_head *, int);
 562
 563 extern struct buffer_head * ext2_getblk (struct inode *, long, int, int *);
 564 extern int ext2_getblk_block (struct inode *, long, int, int *, int *);
 565 extern struct buffer_head * ext2_bread (struct inode *, int, int, int *);
 566
 567 extern int ext2_getcluster (struct inode * inode, long block);
 568 extern void ext2_read_inode (struct inode *);
 569 extern void ext2_write_inode (struct inode *);
 570 extern void ext2_put_inode (struct inode *);
 571 extern void ext2_delete_inode (struct inode *);
 572 extern int ext2_sync_inode (struct inode *);
 573 extern void ext2_discard_prealloc (struct inode *);
 574
 575 /* ioctl.c */
 576 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
 577                        unsigned long);
 578
 579 /* namei.c */
 580 extern void ext2_release (struct inode *, struct file *);
 581 extern struct dentry *ext2_lookup (struct inode *, struct dentry *);
 582 extern int ext2_create (struct inode *,struct dentry *,int);
 583 extern int ext2_mkdir (struct inode *,struct dentry *,int);
 584 extern int ext2_rmdir (struct inode *,struct dentry *);
 585 extern int ext2_unlink (struct inode *,struct dentry *);
 586 extern int ext2_symlink (struct inode *,struct dentry *,const char *);
 587 extern int ext2_link (struct dentry *, struct inode *, struct dentry *);
 588 extern int ext2_mknod (struct inode *, struct dentry *, int, int);
 589 extern int ext2_rename (struct inode *, struct dentry *,
 590                         struct inode *, struct dentry *);
 591
 592 /* super.c */
 593 extern void ext2_error (struct super_block *, const char *, const char *, ...)
 594         __attribute__ ((format (printf, 3, 4)));
 595 extern NORET_TYPE void ext2_panic (struct super_block *, const char *,
 596                                    const char *, ...)
 597         __attribute__ ((NORET_AND format (printf, 3, 4)));
 598 extern void ext2_warning (struct super_block *, const char *, const char *, ...)
 599         __attribute__ ((format (printf, 3, 4)));
 600 extern void ext2_put_super (struct super_block *);
 601 extern void ext2_write_super (struct super_block *);
 602 extern int ext2_remount (struct super_block *, int *, char *);
 603 extern struct super_block * ext2_read_super (struct super_block *,void *,int);
 604 extern int ext2_statfs (struct super_block *, struct statfs *, int);
 605
 606 /* truncate.c */
 607 extern void ext2_truncate (struct inode *);
 608
 609 /*
 610  * Inodes and files operations
 611  */
 612
 613 /* dir.c */
 614 extern struct inode_operations ext2_dir_inode_operations;
 615
 616 /* file.c */
 617 extern struct inode_operations ext2_file_inode_operations;
 618
 619 /* symlink.c */
 620 extern struct inode_operations ext2_symlink_inode_operations;
 621 extern struct inode_operations ext2_fast_symlink_inode_operations;
 622
 623 #endif  /* __KERNEL__ */
 624
 625 #endif  /* _LINUX_EXT2_FS_H */