ext2_fs.h

Go to the documentation of this file.

/*
 *  linux/include/linux/ext2_fs.h
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/include/linux/minix_fs.h
 *
 *  Copyright f(C) 1991, 1992  Linus Torvalds
 */
 
#pragma once
 
#include "types.h"      /* Changed from linux/types.h */
 
/*
 * The second extended filesystem constants/structures
 */
 
/*
 * Define EXT2FS_DEBUG to produce debug messages
 */
#undef EXT2FS_DEBUG
 
/*
 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
 */
#define EXT2_PREALLOCATE
#define EXT2_DEFAULT_PREALLOC_BLOCKS    8
 
/*
 * The second extended file system version
 */
#define EXT2FS_DATE     "95/08/09"
#define EXT2FS_VERSION      "0.5b"
 
/*
 * Special inodes numbers
 */
#define EXT2_BAD_INO         1  /* Bad blocks inode */
#define EXT2_ROOT_INO        2  /* Root inode */
#define EXT2_ACL_IDX_INO     3  /* ACL inode */
#define EXT2_ACL_DATA_INO    4  /* ACL inode */
#define EXT2_BOOT_LOADER_INO     5  /* Boot loader inode */
#define EXT2_UNDEL_DIR_INO   6  /* Undelete directory inode */
#define EXT2_RESIZE_INO      7  /* Reserved group descriptors inode */
#define EXT2_JOURNAL_INO     8  /* Journal inode */
 
/* First non-reserved inode for old ext2 filesystems */
#define EXT2_GOOD_OLD_FIRST_INO 11
 
/*
 * The second extended file system magic number
 */
#define EXT2_SUPER_MAGIC    0xEF53
 
/*
 * Maximal count of links to a file
 */
#define EXT2_LINK_MAX       32000
 
/*
 * Macro-instructions used to manage several block sizes
 */
#define EXT2_MIN_BLOCK_SIZE     1024
#define EXT2_MAX_BLOCK_SIZE     4096
#define EXT2_MIN_BLOCK_LOG_SIZE       10
#ifdef __KERNEL__
# define EXT2_BLOCK_SIZE(s)     ((s)->s_blocksize)
#else
# define EXT2_BLOCK_SIZE(s)     (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
#endif
#define EXT2_ACLE_PER_BLOCK(s)      (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
#define EXT2_ADDR_PER_BLOCK(s)      (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
#ifdef __KERNEL__
# define EXT2_BLOCK_SIZE_BITS(s)    ((s)->s_blocksize_bits)
#else
# define EXT2_BLOCK_SIZE_BITS(s)    ((s)->s_log_block_size + 10)
#endif
#ifdef __KERNEL__
#define EXT2_ADDR_PER_BLOCK_BITS(s) ((s)->u.ext2_sb.s_addr_per_block_bits)
#define EXT2_INODE_SIZE(s)      ((s)->u.ext2_sb.s_inode_size)
#define EXT2_FIRST_INO(s)       ((s)->u.ext2_sb.s_first_ino)
#else
#define EXT2_INODE_SIZE(s)  (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
                 EXT2_GOOD_OLD_INODE_SIZE : \
                 (s)->s_inode_size)
#define EXT2_FIRST_INO(s)   (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
                 EXT2_GOOD_OLD_FIRST_INO : \
                 (s)->s_first_ino)
#endif
 
/*
 * Macro-instructions used to manage fragments
 */
#define EXT2_MIN_FRAG_SIZE      1024
#define EXT2_MAX_FRAG_SIZE      4096
#define EXT2_MIN_FRAG_LOG_SIZE        10
#ifdef __KERNEL__
# define EXT2_FRAG_SIZE(s)      ((s)->u.ext2_sb.s_frag_size)
# define EXT2_FRAGS_PER_BLOCK(s)    ((s)->u.ext2_sb.s_frags_per_block)
#else
# define EXT2_FRAG_SIZE(s)      (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
# define EXT2_FRAGS_PER_BLOCK(s)    (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
#endif
 
/*
 * ACL structures
 */
struct ext2_acl_header  /* Header of Access Control Lists */
{
    __u32   aclh_size;
    __u32   aclh_file_count;
    __u32   aclh_acle_count;
    __u32   aclh_first_acle;
};
 
struct ext2_acl_entry   /* Access Control List Entry */
{
    __u32   acle_size;
    __u16   acle_perms; /* Access permissions */
    __u16   acle_type;  /* Type of entry */
    __u16   acle_tag;   /* User or group identity */
    __u16   acle_pad1;
    __u32   acle_next;  /* Pointer on next entry for the */
                    /* same inode or on next free entry */
};
 
/*
 * Structure of a blocks group descriptor
 */
struct ext2_group_desc
{
    __u32   bg_block_bitmap;        /* Blocks bitmap block */
    __u32   bg_inode_bitmap;        /* Inodes bitmap block */
    __u32   bg_inode_table;     /* Inodes table block */
    __u16   bg_free_blocks_count;   /* Free blocks count */
    __u16   bg_free_inodes_count;   /* Free inodes count */
    __u16   bg_used_dirs_count; /* Directories count */
    __u16   bg_pad;
    __u32   bg_reserved[3];
};
 
/*
 * Data structures used by the directory indexing feature
 *
 * Note: all of the multibyte integer fields are little endian.
 */
 
/*
 * Note: dx_root_info is laid out so that if it should somehow get
 * overlaid by a dirent the two low bits of the hash version will be
 * zero.  Therefore, the hash version mod 4 should never be 0.
 * Sincerely, the paranoia department.
 */
struct ext2_dx_root_info {
    __u32 reserved_zero;
    __u8 hash_version; /* 0 now, 1 at release */
    __u8 info_length; /* 8 */
    __u8 indirect_levels;
    __u8 unused_flags;
};
 
struct ext2_dx_entry {
    __u32 hash;
    __u32 block;
};
 
struct ext2_dx_countlimit {
    __u16 limit;
    __u16 count;
};
 
 
/*
 * Macro-instructions used to manage group descriptors
 */
#ifdef __KERNEL__
# define EXT2_BLOCKS_PER_GROUP(s)   ((s)->u.ext2_sb.s_blocks_per_group)
# define EXT2_DESC_PER_BLOCK(s)     ((s)->u.ext2_sb.s_desc_per_block)
# define EXT2_INODES_PER_GROUP(s)   ((s)->u.ext2_sb.s_inodes_per_group)
# define EXT2_DESC_PER_BLOCK_BITS(s)    ((s)->u.ext2_sb.s_desc_per_block_bits)
#else
# define EXT2_BLOCKS_PER_GROUP(s)   ((s)->s_blocks_per_group)
# define EXT2_DESC_PER_BLOCK(s)     (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
# define EXT2_INODES_PER_GROUP(s)   ((s)->s_inodes_per_group)
#endif
 
/*
 * Constants relative to the data blocks
 */
#define EXT2_NDIR_BLOCKS        12
#define EXT2_IND_BLOCK          EXT2_NDIR_BLOCKS
#define EXT2_DIND_BLOCK         (EXT2_IND_BLOCK + 1)
#define EXT2_TIND_BLOCK         (EXT2_DIND_BLOCK + 1)
#define EXT2_N_BLOCKS           (EXT2_TIND_BLOCK + 1)
 
/*
 * Inode flags
 */
#define EXT2_SECRM_FL           0x00000001 /* Secure deletion */
#define EXT2_UNRM_FL            0x00000002 /* Undelete */
#define EXT2_COMPR_FL           0x00000004 /* Compress file */
#define EXT2_SYNC_FL            0x00000008 /* Synchronous updates */
#define EXT2_IMMUTABLE_FL       0x00000010 /* Immutable file */
#define EXT2_APPEND_FL          0x00000020 /* writes to file may only append */
#define EXT2_NODUMP_FL          0x00000040 /* do not dump file */
#define EXT2_NOATIME_FL         0x00000080 /* do not update atime */
/* Reserved for compression usage... */
#define EXT2_DIRTY_FL           0x00000100
#define EXT2_COMPRBLK_FL        0x00000200 /* One or more compressed clusters */
#define EXT2_NOCOMPR_FL         0x00000400 /* Access raw compressed data */
#define EXT2_ECOMPR_FL          0x00000800 /* Compression error */
/* End compression flags --- maybe not all used */
#define EXT2_BTREE_FL           0x00001000 /* btree format dir */
#define EXT2_INDEX_FL           0x00001000 /* hash-indexed directory */
#define EXT2_IMAGIC_FL          0x00002000
#define EXT3_JOURNAL_DATA_FL        0x00004000 /* file data should be journaled */
#define EXT2_NOTAIL_FL          0x00008000 /* file tail should not be merged */
#define EXT2_RESERVED_FL        0x80000000 /* reserved for ext2 lib */
 
#define EXT2_FL_USER_VISIBLE        0x0000DFFF /* User visible flags */
#define EXT2_FL_USER_MODIFIABLE     0x000080FF /* User modifiable flags */
 
/*
 * ioctl commands
 */
#define EXT2_IOC_GETFLAGS       _IOR('f', 1, long)
#define EXT2_IOC_SETFLAGS       _IOW('f', 2, long)
#define EXT2_IOC_GETVERSION     _IOR('v', 1, long)
#define EXT2_IOC_SETVERSION     _IOW('v', 2, long)
 
/*
 * Structure of an inode on the disk
 */
struct ext2_inode {
    __u16   i_mode;     /* File mode */
    __u16   i_uid;      /* Low 16 bits of Owner Uid */
    __u32   i_size;     /* Size in bytes */
    __u32   i_atime;    /* Access time */
    __u32   i_ctime;    /* Creation time */
    __u32   i_mtime;    /* Modification time */
    __u32   i_dtime;    /* Deletion Time */
    __u16   i_gid;      /* Low 16 bits of Group Id */
    __u16   i_links_count;  /* Links count */
    __u32   i_blocks;   /* Blocks count */
    __u32   i_flags;    /* File flags */
    union {
        struct {
            __u32  l_i_reserved1;
        } linux1;
        struct {
            __u32  h_i_translator;
        } hurd1;
        struct {
            __u32  m_i_reserved1;
        } masix1;
    } osd1;             /* OS dependent 1 */
    __u32   i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
    __u32   i_generation;   /* File version (for NFS) */
    __u32   i_file_acl; /* File ACL */
    __u32   i_dir_acl;  /* Directory ACL */
    __u32   i_faddr;    /* Fragment address */
    union {
        struct {
            __u8    l_i_frag;   /* Fragment number */
            __u8    l_i_fsize;  /* Fragment size */
            __u16   i_pad1;
            __u16   l_i_uid_high;   /* these 2 fields    */
            __u16   l_i_gid_high;   /* were reserved2[0] */
            __u32   l_i_reserved2;
        } linux2;
        struct {
            __u8    h_i_frag;   /* Fragment number */
            __u8    h_i_fsize;  /* Fragment size */
            __u16   h_i_mode_high;
            __u16   h_i_uid_high;
            __u16   h_i_gid_high;
            __u32   h_i_author;
        } hurd2;
        struct {
            __u8    m_i_frag;   /* Fragment number */
            __u8    m_i_fsize;  /* Fragment size */
            __u16   m_pad1;
            __u32   m_i_reserved2[2];
        } masix2;
    } osd2;             /* OS dependent 2 */
};
 
#define i_size_high i_dir_acl
 
#if defined(__KERNEL__) || defined(__linux__)
#define i_reserved1 osd1.linux1.l_i_reserved1
#define i_frag      osd2.linux2.l_i_frag
#define i_fsize     osd2.linux2.l_i_fsize
#define i_uid_low   i_uid
#define i_gid_low   i_gid
#define i_uid_high  osd2.linux2.l_i_uid_high
#define i_gid_high  osd2.linux2.l_i_gid_high
#define i_reserved2 osd2.linux2.l_i_reserved2
 
#elif defined(__GNU__)
 
#define i_translator    osd1.hurd1.h_i_translator
#define i_frag      osd2.hurd2.h_i_frag;
#define i_fsize     osd2.hurd2.h_i_fsize;
#define i_uid_high  osd2.hurd2.h_i_uid_high
#define i_gid_high  osd2.hurd2.h_i_gid_high
#define i_author    osd2.hurd2.h_i_author
 
#elif defined(__masix__)
 
#define i_reserved1 osd1.masix1.m_i_reserved1
#define i_frag      osd2.masix2.m_i_frag
#define i_fsize     osd2.masix2.m_i_fsize
#define i_reserved2 osd2.masix2.m_i_reserved2
 
#endif  /* defined(__KERNEL) || defined(__linux__) */
 
/*
 * File system states
 */
#define EXT2_VALID_FS           0x0001  /* Unmounted cleanly */
#define EXT2_ERROR_FS           0x0002  /* Errors detected */
 
/*
 * Mount flags
 */
#define EXT2_MOUNT_CHECK        0x0001  /* Do mount-time checks */
#define EXT2_MOUNT_GRPID        0x0004  /* Create files with directory's group */
#define EXT2_MOUNT_DEBUG        0x0008  /* Some debugging messages */
#define EXT2_MOUNT_ERRORS_CONT      0x0010  /* Continue on errors */
#define EXT2_MOUNT_ERRORS_RO        0x0020  /* Remount fs ro on errors */
#define EXT2_MOUNT_ERRORS_PANIC     0x0040  /* Panic on errors */
#define EXT2_MOUNT_MINIX_DF     0x0080  /* Mimics the Minix statfs */
#define EXT2_MOUNT_NO_UID32     0x0200  /* Disable 32-bit UIDs */
 
#define clear_opt(o, opt)       o &= ~EXT2_MOUNT_##opt
#define set_opt(o, opt)         o |= EXT2_MOUNT_##opt
#define test_opt(sb, opt)       ((sb)->u.ext2_sb.s_mount_opt & \
                     EXT2_MOUNT_##opt)
/*
 * Maximal mount counts between two filesystem checks
 */
#define EXT2_DFL_MAX_MNT_COUNT      20  /* Allow 20 mounts */
#define EXT2_DFL_CHECKINTERVAL      0   /* Don't use interval check */
 
/*
 * Behaviour when detecting errors
 */
#define EXT2_ERRORS_CONTINUE        1   /* Continue execution */
#define EXT2_ERRORS_RO          2   /* Remount fs read-only */
#define EXT2_ERRORS_PANIC       3   /* Panic */
#define EXT2_ERRORS_DEFAULT     EXT2_ERRORS_CONTINUE
 
/*
 * Structure of the super block
 */
struct ext2_super_block {
    __u32   s_inodes_count;     /* Inodes count */
    __u32   s_blocks_count;     /* Blocks count */
    __u32   s_r_blocks_count;   /* Reserved blocks count */
    __u32   s_free_blocks_count;    /* Free blocks count */
    __u32   s_free_inodes_count;    /* Free inodes count */
    __u32   s_first_data_block; /* First Data Block */
    __u32   s_log_block_size;   /* Block size */
    __s32   s_log_frag_size;    /* Fragment size */
    __u32   s_blocks_per_group; /* # Blocks per group */
    __u32   s_frags_per_group;  /* # Fragments per group */
    __u32   s_inodes_per_group; /* # Inodes per group */
    __u32   s_mtime;        /* Mount time */
    __u32   s_wtime;        /* Write time */
    __u16   s_mnt_count;        /* Mount count */
    __s16   s_max_mnt_count;    /* Maximal mount count */
    __u16   s_magic;        /* Magic signature */
    __u16   s_state;        /* File system state */
    __u16   s_errors;       /* Behaviour when detecting errors */
    __u16   s_minor_rev_level;  /* minor revision level */
    __u32   s_lastcheck;        /* time of last check */
    __u32   s_checkinterval;    /* max. time between checks */
    __u32   s_creator_os;       /* OS */
    __u32   s_rev_level;        /* Revision level */
    __u16   s_def_resuid;       /* Default uid for reserved blocks */
    __u16   s_def_resgid;       /* Default gid for reserved blocks */
    /*
     * These fields are for EXT2_DYNAMIC_REV superblocks only.
     *
     * Note: the difference between the compatible feature set and
     * the incompatible feature set is that if there is a bit set
     * in the incompatible feature set that the kernel doesn't
     * know about, it should refuse to mount the filesystem.
     *
     * e2fsck's requirements are more strict; if it doesn't know
     * about a feature in either the compatible or incompatible
     * feature set, it must abort and not try to meddle with
     * things it doesn't understand...
     */
    __u32   s_first_ino;        /* First non-reserved inode */
    __u16   s_inode_size;       /* size of inode structure */
    __u16   s_block_group_nr;   /* block group # of this superblock */
    __u32   s_feature_compat;   /* compatible feature set */
    __u32   s_feature_incompat;     /* incompatible feature set */
    __u32   s_feature_ro_compat;    /* readonly-compatible feature set */
    __u8    s_uuid[16];     /* 128-bit uuid for volume */
    char    s_volume_name[16];  /* volume name */
    char    s_last_mounted[64];     /* directory where last mounted */
    __u32   s_algorithm_usage_bitmap; /* For compression */
    /*
     * Performance hints.  Directory preallocation should only
     * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
     */
    __u8    s_prealloc_blocks;  /* Nr of blocks to try to preallocate*/
    __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
    __u16   s_padding1;
    /*
     * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
     */
    __u8    s_journal_uuid[16]; /* uuid of journal superblock */
    __u32   s_journal_inum;     /* inode number of journal file */
    __u32   s_journal_dev;      /* device number of journal file */
    __u32   s_last_orphan;      /* start of list of inodes to delete */
 
    __u32   s_reserved[197];    /* Padding to the end of the block */
};
 
#ifdef __KERNEL__
#define EXT2_SB(sb) (&((sb)->u.ext2_sb))
#else
/* Assume that user mode programs are passing in an ext2fs superblock, not
 * a kernel struct super_block.  This will allow us to call the feature-test
 * macros from user land. */
#define EXT2_SB(sb) (sb)
#endif
 
/*
 * Codes for operating systems
 */
#define EXT2_OS_LINUX       0
#define EXT2_OS_HURD        1
#define EXT2_OS_MASIX       2
#define EXT2_OS_FREEBSD     3
#define EXT2_OS_LITES       4
#define EXT2_OS_WINNT       5
 
/*
 * Revision levels
 */
#define EXT2_GOOD_OLD_REV   0   /* The good old (original) format */
#define EXT2_DYNAMIC_REV    1   /* V2 format w/ dynamic inode sizes */
 
#define EXT2_CURRENT_REV    EXT2_GOOD_OLD_REV
#define EXT2_MAX_SUPP_REV   EXT2_DYNAMIC_REV
 
#define EXT2_GOOD_OLD_INODE_SIZE 128
 
/*
 * Feature set definitions
 */
 
#define EXT2_HAS_COMPAT_FEATURE(sb,mask)            \
    ( EXT2_SB(sb)->s_feature_compat & (mask) )
#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)         \
    ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)          \
    ( EXT2_SB(sb)->s_feature_incompat & (mask) )
 
#define EXT2_FEATURE_COMPAT_DIR_PREALLOC    0x0001
#define EXT2_FEATURE_COMPAT_IMAGIC_INODES   0x0002
#define EXT3_FEATURE_COMPAT_HAS_JOURNAL     0x0004
#define EXT2_FEATURE_COMPAT_EXT_ATTR        0x0008
#define EXT2_FEATURE_COMPAT_RESIZE_INODE    0x0010
#define EXT2_FEATURE_COMPAT_DIR_INDEX       0x0020
 
#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE   0x0002
#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR    0x0004
 
#define EXT2_FEATURE_INCOMPAT_COMPRESSION   0x0001
#define EXT2_FEATURE_INCOMPAT_FILETYPE      0x0002
#define EXT3_FEATURE_INCOMPAT_RECOVER       0x0004 /* Needs recovery */
#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV   0x0008 /* Journal device */
 
#define EXT2_FEATURE_COMPAT_SUPP    0
#define EXT2_FEATURE_INCOMPAT_SUPP  EXT2_FEATURE_INCOMPAT_FILETYPE
#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
                     EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
                     EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
 
/*
 * Default values for user and/or group using reserved blocks
 */
#define EXT2_DEF_RESUID     0
#define EXT2_DEF_RESGID     0
 
/*
 * Structure of a directory entry
 */
#define EXT2_NAME_LEN 255
 
struct ext2_dir_entry {
    __u32   inode;          /* Inode number */
    __u16   rec_len;        /* Directory entry length */
    __u16   name_len;       /* Name length */
    char    name[EXT2_NAME_LEN];    /* File name */
};
 
/*
 * The new version of the directory entry.  Since EXT2 structures are
 * stored in intel byte order, and the name_len field could never be
 * bigger than 255 chars, it's safe to reclaim the extra byte for the
 * file_type field.
 */
struct ext2_dir_entry_2 {
    __u32   inode;          /* Inode number */
    __u16   rec_len;        /* Directory entry length */
    __u8    name_len;       /* Name length */
    __u8    file_type;
    char    name[EXT2_NAME_LEN];    /* File name */
};
 
/*
 * Ext2 directory file types.  Only the low 3 bits are used.  The
 * other bits are reserved for now.
 */
#define EXT2_FT_UNKNOWN     0
#define EXT2_FT_REG_FILE    1
#define EXT2_FT_DIR     2
#define EXT2_FT_CHRDEV      3
#define EXT2_FT_BLKDEV      4
#define EXT2_FT_FIFO        5
#define EXT2_FT_SOCK        6
#define EXT2_FT_SYMLINK     7
 
#define EXT2_FT_MAX     8
 
/*
 * EXT2_DIR_PAD defines the directory entries boundaries
 *
 * NOTE: It must be a multiple of 4
 */
#define EXT2_DIR_PAD            4
#define EXT2_DIR_ROUND          (EXT2_DIR_PAD - 1)
#define EXT2_DIR_REC_LEN(name_len)  (((name_len) + 8 + EXT2_DIR_ROUND) & \
                     ~EXT2_DIR_ROUND)
 
#ifdef __KERNEL__
/*
 * Function prototypes
 */
 
/*
 * Ok, these declarations are also in <linux/kernel.h> but none of the
 * ext2 source programs needs to include it so they are duplicated here.
 */
# define NORET_TYPE    
# define ATTRIB_NORET  __attribute__((noreturn))
# define NORET_AND     noreturn,
 
/* acl.c */
extern int ext2_permission (struct inode *, int);
 
/* balloc.c */
extern int ext2_bg_has_super(struct super_block *sb, int group);
extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
extern int ext2_new_block (const struct inode *, unsigned long,
               __u32 *, __u32 *, int *);
extern void ext2_free_blocks (const struct inode *, unsigned long,
                  unsigned long);
extern unsigned long ext2_count_free_blocks (struct super_block *);
extern void ext2_check_blocks_bitmap (struct super_block *);
extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
                            unsigned int block_group,
                            struct buffer_head ** bh);
 
/* bitmap.c */
extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
 
/* dir.c */
extern int ext2_check_dir_entry (const char *, struct inode *,
                 struct ext2_dir_entry_2 *, struct buffer_head *,
                 unsigned long);
 
/* file.c */
extern int ext2_read (struct inode *, struct file *, char *, int);
extern int ext2_write (struct inode *, struct file *, char *, int);
 
/* fsync.c */
extern int ext2_sync_file (struct file *, struct dentry *, int);
extern int ext2_fsync_inode (struct inode *, int);
 
/* ialloc.c */
extern struct inode * ext2_new_inode (const struct inode *, int);
extern void ext2_free_inode (struct inode *);
extern unsigned long ext2_count_free_inodes (struct super_block *);
extern void ext2_check_inodes_bitmap (struct super_block *);
 
/* inode.c */
 
extern struct buffer_head * ext2_getblk (struct inode *, long, int, int *);
extern struct buffer_head * ext2_bread (struct inode *, int, int, int *);
 
extern void ext2_read_inode (struct inode *);
extern void ext2_write_inode (struct inode *, int);
extern void ext2_put_inode (struct inode *);
extern void ext2_delete_inode (struct inode *);
extern int ext2_sync_inode (struct inode *);
extern void ext2_discard_prealloc (struct inode *);
 
/* ioctl.c */
extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
               unsigned long);
 
/* namei.c */
extern struct inode_operations ext2_dir_inode_operations;
 
/* super.c */
extern void ext2_error (struct super_block *, const char *, const char *, ...)
    __attribute__ ((format (printf, 3, 4)));
extern NORET_TYPE void ext2_panic (struct super_block *, const char *,
                   const char *, ...)
    __attribute__ ((NORET_AND format (printf, 3, 4)));
extern void ext2_warning (struct super_block *, const char *, const char *, ...)
    __attribute__ ((format (printf, 3, 4)));
extern void ext2_update_dynamic_rev (struct super_block *sb);
extern void ext2_put_super (struct super_block *);
extern void ext2_write_super (struct super_block *);
extern int ext2_remount (struct super_block *, int *, char *);
extern struct super_block * ext2_read_super (struct super_block *,void *,int);
extern int ext2_statfs (struct super_block *, struct statfs *);
 
/* truncate.c */
extern void ext2_truncate (struct inode *);
 
/*
 * Inodes and files operations
 */
 
/* dir.c */
extern struct file_operations ext2_dir_operations;
 
/* file.c */
extern struct inode_operations ext2_file_inode_operations;
extern struct file_operations ext2_file_operations;
 
/* symlink.c */
extern struct inode_operations ext2_fast_symlink_inode_operations;
 
extern struct address_space_operations ext2_aops;
 
#endif  /* __KERNEL__ */