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ext2fs.h

/*
 * ext2fs.h --- ext2fs
 * 
 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#ifndef _EXT2FS_EXT2FS_H
#define _EXT2FS_EXT2FS_H

/*
 * Non-GNU C compilers won't necessarily understand inline
 */
#if (!defined(__GNUC__) && !defined(__WATCOMC__))
#define NO_INLINE_FUNCS
#endif

/*
 * Where the master copy of the superblock is located, and how big
 * superblocks are supposed to be.  We define SUPERBLOCK_SIZE because
 * the size of the superblock structure is not necessarily trustworthy
 * (some versions have the padding set up so that the superblock is
 * 1032 bytes long).
 */
#define SUPERBLOCK_OFFSET     1024
#define SUPERBLOCK_SIZE       1024

/*
 * The last ext2fs revision level that this version of the library is
 * able to support.
 */
#define EXT2_LIB_CURRENT_REV  0

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#include <stdlib.h>

#if EXT2_FLAT_INCLUDES
#include "e2_types.h"
#else
#include <asm/types.h>
#if (defined(__GNUC__) && defined(__STRICT_ANSI__) && ((~0UL) == 0xffffffff))
typedef __signed__ long long __s64;
typedef unsigned long long __u64;
#endif
#endif

typedef __u32           blk_t;
typedef __u32           dgrp_t;
typedef __u32           ext2_off_t;
typedef __s64           e2_blkcnt_t;

#if EXT2_FLAT_INCLUDES
#include "com_err.h"
#include "ext2_io.h"
#include "ext2_err.h"
#else
#include "et/com_err.h"
#include "ext2fs/ext2_io.h"
#include "ext2fs/ext2_err.h"
#endif

/*
 * Portability help for Microsoft Visual C++
 */
#ifdef _MSC_VER
#define EXT2_QSORT_TYPE int __cdecl
#else
#define EXT2_QSORT_TYPE int
#endif

typedef struct struct_ext2_filsys *ext2_filsys;

struct ext2fs_struct_generic_bitmap {
      errcode_t   magic;
      ext2_filsys       fs;
      __u32       start, end;
      __u32       real_end;
      char  *     description;
      char  *     bitmap;
      errcode_t   base_error_code;
      __u32       reserved[7];
};

#define EXT2FS_MARK_ERROR     0
#define EXT2FS_UNMARK_ERROR   1
#define EXT2FS_TEST_ERROR     2

typedef struct ext2fs_struct_generic_bitmap *ext2fs_generic_bitmap;
typedef struct ext2fs_struct_generic_bitmap *ext2fs_inode_bitmap;
typedef struct ext2fs_struct_generic_bitmap *ext2fs_block_bitmap;

#ifdef EXT2_DYNAMIC_REV
#define EXT2_FIRST_INODE(s)   EXT2_FIRST_INO(s)
#else
#define EXT2_FIRST_INODE(s)   EXT2_FIRST_INO
#define EXT2_INODE_SIZE(s)    sizeof(struct ext2_inode)
#endif

/*
 * badblocks list definitions
 */

typedef struct ext2_struct_badblocks_list *ext2_badblocks_list;
typedef struct ext2_struct_badblocks_iterate *ext2_badblocks_iterate;

/* old */
typedef struct ext2_struct_badblocks_list *badblocks_list;
typedef struct ext2_struct_badblocks_iterate *badblocks_iterate;

#define BADBLOCKS_FLAG_DIRTY  1

/*
 * ext2_dblist structure and abstractions (see dblist.c)
 */
struct ext2_db_entry {
      ino_t ino;
      blk_t blk;
      int   blockcnt;
};

typedef struct ext2_struct_dblist *ext2_dblist;

#define DBLIST_ABORT    1

/*
 * ext2_fileio definitions
 */

#define EXT2_FILE_WRITE       0x0001
#define EXT2_FILE_CREATE      0x0002

#define EXT2_FILE_MASK        0x00FF

#define EXT2_FILE_BUF_DIRTY   0x4000
#define EXT2_FILE_BUF_VALID   0x2000

typedef struct ext2_file *ext2_file_t;

#define EXT2_SEEK_SET   0
#define EXT2_SEEK_CUR   1
#define EXT2_SEEK_END   2

/*
 * Flags for the ext2_filsys structure
 */

#define EXT2_FLAG_RW                0x01
#define EXT2_FLAG_CHANGED           0x02
#define EXT2_FLAG_DIRTY             0x04
#define EXT2_FLAG_VALID             0x08
#define EXT2_FLAG_IB_DIRTY          0x10
#define EXT2_FLAG_BB_DIRTY          0x20
#define EXT2_FLAG_SWAP_BYTES        0x40
#define EXT2_FLAG_SWAP_BYTES_READ   0x80
#define EXT2_FLAG_SWAP_BYTES_WRITE  0x100
#define EXT2_FLAG_MASTER_SB_ONLY    0x200
#define EXT2_FLAG_FORCE             0x400

/*
 * Special flag in the ext2 inode i_flag field that means that this is
 * a new inode.  (So that ext2_write_inode() can clear extra fields.)
 */
#define EXT2_NEW_INODE_FL     0x80000000

struct struct_ext2_filsys {
      errcode_t               magic;
      io_channel              io;
      int                     flags;
      char *                        device_name;
      struct ext2_super_block *     super;
      int                     blocksize;
      int                     fragsize;
      dgrp_t                        group_desc_count;
      unsigned long                 desc_blocks;
      struct ext2_group_desc *      group_desc;
      int                     inode_blocks_per_group;
      ext2fs_inode_bitmap           inode_map;
      ext2fs_block_bitmap           block_map;
      errcode_t (*get_blocks)(ext2_filsys fs, ino_t ino, blk_t *blocks);
      errcode_t (*check_directory)(ext2_filsys fs, ino_t ino);
      errcode_t (*write_bitmaps)(ext2_filsys fs);
      errcode_t (*read_inode)(ext2_filsys fs, ino_t ino,
                        struct ext2_inode *inode);
      errcode_t (*write_inode)(ext2_filsys fs, ino_t ino,
                        struct ext2_inode *inode);
      badblocks_list                badblocks;
      ext2_dblist             dblist;
      __u32                   stride;     /* for mke2fs */
      /*
       * Reserved for future expansion
       */
      __u32                   reserved[11];

      /*
       * Reserved for the use of the calling application.
       */
      void *                        priv_data;

      /*
       * Inode cache
       */
      struct ext2_inode_cache       *icache;
};

#if EXT2_FLAT_INCLUDES
#include "e2_bitops.h"
#else
#include "ext2fs/bitops.h"
#endif

/*
 * Return flags for the block iterator functions
 */
#define BLOCK_CHANGED   1
#define BLOCK_ABORT     2
#define BLOCK_ERROR     4

/*
 * Block interate flags
 *
 * BLOCK_FLAG_APPEND, or BLOCK_FLAG_HOLE, indicates that the interator
 * function should be called on blocks where the block number is zero.
 * This is used by ext2fs_expand_dir() to be able to add a new block
 * to an inode.  It can also be used for programs that want to be able
 * to deal with files that contain "holes".
 * 
 * BLOCK_FLAG_TRAVERSE indicates that the iterator function for the
 * indirect, doubly indirect, etc. blocks should be called after all
 * of the blocks containined in the indirect blocks are processed.
 * This is useful if you are going to be deallocating blocks from an
 * inode.
 *
 * BLOCK_FLAG_DATA_ONLY indicates that the iterator function should be
 * called for data blocks only.
 *
 * BLOCK_FLAG_NO_LARGE is for internal use only.  It informs
 * ext2fs_block_iterate2 that large files won't be accepted.
 */
#define BLOCK_FLAG_APPEND     1
#define BLOCK_FLAG_HOLE       1
#define BLOCK_FLAG_DEPTH_TRAVERSE   2
#define BLOCK_FLAG_DATA_ONLY  4

#define BLOCK_FLAG_NO_LARGE   0x1000

/*
 * Magic "block count" return values for the block iterator function.
 */
#define BLOCK_COUNT_IND       (-1)
#define BLOCK_COUNT_DIND      (-2)
#define BLOCK_COUNT_TIND      (-3)
#define BLOCK_COUNT_TRANSLATOR      (-4)

#if 0
/*
 * Flags for ext2fs_move_blocks
 */
#define EXT2_BMOVE_GET_DBLIST 0x0001      
#define EXT2_BMOVE_DEBUG      0x0002
#endif

/*
 * Return flags for the directory iterator functions
 */
#define DIRENT_CHANGED  1
#define DIRENT_ABORT    2
#define DIRENT_ERROR    3

/*
 * Directory iterator flags
 */

#define DIRENT_FLAG_INCLUDE_EMPTY   1


#define DIRENT_DOT_FILE       1
#define DIRENT_DOT_DOT_FILE   2
#define DIRENT_OTHER_FILE     3

/*
 * Inode scan definitions
 */
typedef struct ext2_struct_inode_scan *ext2_inode_scan;

/*
 * ext2fs_scan flags
 */
#define EXT2_SF_CHK_BADBLOCKS 0x0001
#define EXT2_SF_BAD_INODE_BLK 0x0002
#define EXT2_SF_BAD_EXTRA_BYTES     0x0004
#define EXT2_SF_SKIP_MISSING_ITABLE 0x0008

/*
 * ext2fs_check_if_mounted flags
 */
#define EXT2_MF_MOUNTED       1
#define EXT2_MF_ISROOT        2
#define EXT2_MF_READONLY      4

/*
 * Ext2/linux mode flags.  We define them here so that we don't need
 * to depend on the OS's sys/stat.h, since we may be compiling on a
 * non-Linux system.
 */
#define LINUX_S_IFMT  00170000
#define LINUX_S_IFSOCK 0140000
#define LINUX_S_IFLNK    0120000
#define LINUX_S_IFREG  0100000
#define LINUX_S_IFBLK  0060000
#define LINUX_S_IFDIR  0040000
#define LINUX_S_IFCHR  0020000
#define LINUX_S_IFIFO  0010000
#define LINUX_S_ISUID  0004000
#define LINUX_S_ISGID  0002000
#define LINUX_S_ISVTX  0001000

#define LINUX_S_IRWXU 00700
#define LINUX_S_IRUSR 00400
#define LINUX_S_IWUSR 00200
#define LINUX_S_IXUSR 00100

#define LINUX_S_IRWXG 00070
#define LINUX_S_IRGRP 00040
#define LINUX_S_IWGRP 00020
#define LINUX_S_IXGRP 00010

#define LINUX_S_IRWXO 00007
#define LINUX_S_IROTH 00004
#define LINUX_S_IWOTH 00002
#define LINUX_S_IXOTH 00001

#define LINUX_S_ISLNK(m)      (((m) & LINUX_S_IFMT) == LINUX_S_IFLNK)
#define LINUX_S_ISREG(m)      (((m) & LINUX_S_IFMT) == LINUX_S_IFREG)
#define LINUX_S_ISDIR(m)      (((m) & LINUX_S_IFMT) == LINUX_S_IFDIR)
#define LINUX_S_ISCHR(m)      (((m) & LINUX_S_IFMT) == LINUX_S_IFCHR)
#define LINUX_S_ISBLK(m)      (((m) & LINUX_S_IFMT) == LINUX_S_IFBLK)
#define LINUX_S_ISFIFO(m)     (((m) & LINUX_S_IFMT) == LINUX_S_IFIFO)
#define LINUX_S_ISSOCK(m)     (((m) & LINUX_S_IFMT) == LINUX_S_IFSOCK)

/*
 * ext2_icount_t abstraction
 */
#define EXT2_ICOUNT_OPT_INCREMENT   0x01

typedef struct ext2_icount *ext2_icount_t;

/*
 * Flags for ext2fs_bmap
 */
#define BMAP_ALLOC      1

/*
 * For checking structure magic numbers...
 */

#define EXT2_CHECK_MAGIC(struct, code) \
        if ((struct)->magic != (code)) return (code)


/*
 * The ext2fs library private definition of the ext2 superblock, so we
 * don't have to depend on the kernel's definition of the superblock,
 * which might not have the latest features.
 */
struct ext2fs_sb {
      __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_COMPAT_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;
      __u32 s_reserved[204];  /* Padding to the end of the block */
};

/*
 * Feature set definitions (that might not be in ext2_fs.h
 * (was EXT2_COMPAT_SPARSE_SUPER)
 */

#ifndef EXT2_FEATURE_COMPAT_DIR_PREALLOC
#define EXT2_FEATURE_COMPAT_DIR_PREALLOC  0x0001
#endif

#ifndef EXT2_FEATURE_COMPAT_IMAGIC_INODES /* for AFS, etc. */
#define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
#endif

#ifndef EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
#endif

#ifndef EXT2_FEATURE_RO_COMPAT_LARGE_FILE
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
#define i_size_high i_dir_acl
#endif

#ifndef EXT2_FEATURE_RO_COMPAT_BTREE_DIR
#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR  0x0004
#endif

#ifndef EXT2_FEATURE_INCOMPAT_COMPRESSION
#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
#endif

#ifndef EXT2_FEATURE_INCOMPAT_FILETYPE
#define EXT2_FEATURE_INCOMPAT_FILETYPE    0x0002
#endif

#define EXT2_LIB_FEATURE_COMPAT_SUPP      EXT2_FEATURE_COMPAT_DIR_PREALLOC
#define EXT2_LIB_FEATURE_INCOMPAT_SUPP    EXT2_FEATURE_INCOMPAT_FILETYPE
#define EXT2_LIB_FEATURE_RO_COMPAT_SUPP   (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER|\
                               EXT2_FEATURE_RO_COMPAT_LARGE_FILE)
/*
 * function prototypes
 */

/* alloc.c */
extern errcode_t ext2fs_new_inode(ext2_filsys fs, ino_t dir, int mode,
                          ext2fs_inode_bitmap map, ino_t *ret);
extern errcode_t ext2fs_new_block(ext2_filsys fs, blk_t goal,
                          ext2fs_block_bitmap map, blk_t *ret);
extern errcode_t ext2fs_get_free_blocks(ext2_filsys fs, blk_t start,
                              blk_t finish, int num,
                              ext2fs_block_bitmap map,
                              blk_t *ret);
extern errcode_t ext2fs_alloc_block(ext2_filsys fs, blk_t goal,
                            char *block_buf, blk_t *ret);

/* alloc_tables.c */
extern errcode_t ext2fs_allocate_tables(ext2_filsys fs);
extern errcode_t ext2fs_allocate_group_table(ext2_filsys fs, dgrp_t group,
                                   ext2fs_block_bitmap bmap);

/* badblocks.c */
extern errcode_t ext2fs_badblocks_list_create(ext2_badblocks_list *ret,
                                  int size);
extern errcode_t ext2fs_badblocks_list_add(ext2_badblocks_list bb,
                                 blk_t blk);
extern int ext2fs_badblocks_list_test(ext2_badblocks_list bb,
                            blk_t blk);
extern errcode_t
      ext2fs_badblocks_list_iterate_begin(ext2_badblocks_list bb,
                                  ext2_badblocks_iterate *ret);
extern int ext2fs_badblocks_list_iterate(ext2_badblocks_iterate iter,
                               blk_t *blk);
extern void ext2fs_badblocks_list_iterate_end(ext2_badblocks_iterate iter);
extern errcode_t ext2fs_badblocks_copy(ext2_badblocks_list src,
                               ext2_badblocks_list *dest);

/* bb_compat */
extern errcode_t badblocks_list_create(badblocks_list *ret, int size);
extern errcode_t badblocks_list_add(badblocks_list bb, blk_t blk);
extern int badblocks_list_test(badblocks_list bb, blk_t blk);
extern errcode_t badblocks_list_iterate_begin(badblocks_list bb,
                                    badblocks_iterate *ret);
extern int badblocks_list_iterate(badblocks_iterate iter, blk_t *blk);
extern void badblocks_list_iterate_end(badblocks_iterate iter);
extern void badblocks_list_free(badblocks_list bb);

/* bb_inode.c */
extern errcode_t ext2fs_update_bb_inode(ext2_filsys fs,
                              ext2_badblocks_list bb_list);

/* bitmaps.c */
extern errcode_t ext2fs_write_inode_bitmap(ext2_filsys fs);
extern errcode_t ext2fs_write_block_bitmap (ext2_filsys fs);
extern errcode_t ext2fs_read_inode_bitmap (ext2_filsys fs);
extern errcode_t ext2fs_read_block_bitmap(ext2_filsys fs);
extern errcode_t ext2fs_allocate_generic_bitmap(__u32 start,
                                    __u32 end,
                                    __u32 real_end,
                                    const char *descr,
                                    ext2fs_generic_bitmap *ret);
extern errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
                                    const char *descr,
                                    ext2fs_block_bitmap *ret);
extern errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
                                    const char *descr,
                                    ext2fs_inode_bitmap *ret);
extern errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
                                     ino_t end, ino_t *oend);
extern errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
                                     blk_t end, blk_t *oend);
extern void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap);
extern void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap);
extern errcode_t ext2fs_read_bitmaps(ext2_filsys fs);
extern errcode_t ext2fs_write_bitmaps(ext2_filsys fs);

/* block.c */
extern errcode_t ext2fs_block_iterate(ext2_filsys fs,
                              ino_t ino,
                              int   flags,
                              char *block_buf,
                              int (*func)(ext2_filsys fs,
                                      blk_t     *blocknr,
                                      int blockcnt,
                                      void      *priv_data),
                              void *priv_data);
errcode_t ext2fs_block_iterate2(ext2_filsys fs,
                        ino_t ino,
                        int   flags,
                        char *block_buf,
                        int (*func)(ext2_filsys fs,
                                  blk_t   *blocknr,
                                  e2_blkcnt_t   blockcnt,
                                  blk_t   ref_blk,
                                  int           ref_offset,
                                  void    *priv_data),
                        void *priv_data);

/* bmap.c */
extern errcode_t ext2fs_bmap(ext2_filsys fs, ino_t ino,
                       struct ext2_inode *inode, 
                       char *block_buf, int bmap_flags,
                       blk_t block, blk_t *phys_blk);


#if 0
/* bmove.c */
extern errcode_t ext2fs_move_blocks(ext2_filsys fs,
                            ext2fs_block_bitmap reserve,
                            ext2fs_block_bitmap alloc_map,
                            int flags);
#endif

/* check_desc.c */
extern errcode_t ext2fs_check_desc(ext2_filsys fs);

/* closefs.c */
extern errcode_t ext2fs_close(ext2_filsys fs);
extern errcode_t ext2fs_flush(ext2_filsys fs);
extern int ext2fs_bg_has_super(ext2_filsys fs, int group_block);

/* cmp_bitmaps.c */
extern errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
                                   ext2fs_block_bitmap bm2);
extern errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
                                   ext2fs_inode_bitmap bm2);

/* dblist.c */

extern errcode_t ext2fs_get_num_dirs(ext2_filsys fs, ino_t *ret_num_dirs);
extern errcode_t ext2fs_init_dblist(ext2_filsys fs, ext2_dblist *ret_dblist);
extern errcode_t ext2fs_add_dir_block(ext2_dblist dblist, ino_t ino,
                              blk_t blk, int blockcnt);
extern errcode_t ext2fs_dblist_iterate(ext2_dblist dblist,
      int (*func)(ext2_filsys fs, struct ext2_db_entry *db_info,
                void    *priv_data),
       void *priv_data);
extern errcode_t ext2fs_set_dir_block(ext2_dblist dblist, ino_t ino,
                              blk_t blk, int blockcnt);
extern errcode_t ext2fs_copy_dblist(ext2_dblist src,
                            ext2_dblist *dest);
extern int ext2fs_dblist_count(ext2_dblist dblist);

/* dblist_dir.c */
extern errcode_t
      ext2fs_dblist_dir_iterate(ext2_dblist dblist,
                          int flags,
                          char      *block_buf,
                          int (*func)(ino_t     dir,
                                    int         entry,
                                    struct ext2_dir_entry *dirent,
                                    int   offset,
                                    int   blocksize,
                                    char  *buf,
                                    void  *priv_data),
                          void *priv_data);

/* dirblock.c */
extern errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block,
                               void *buf);
extern errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block,
                              void *buf);

/* dir_iterate.c */
extern errcode_t ext2fs_dir_iterate(ext2_filsys fs, 
                        ino_t dir,
                        int flags,
                        char *block_buf,
                        int (*func)(struct ext2_dir_entry *dirent,
                                int offset,
                                int blocksize,
                                char      *buf,
                                void      *priv_data),
                        void *priv_data);

/* dupfs.c */
extern errcode_t ext2fs_dup_handle(ext2_filsys src, ext2_filsys *dest);

/* expanddir.c */
extern errcode_t ext2fs_expand_dir(ext2_filsys fs, ino_t dir);

/* fileio.c */
extern errcode_t ext2fs_file_open(ext2_filsys fs, ino_t ino,
                          int flags, ext2_file_t *ret);
extern ext2_filsys ext2fs_file_get_fs(ext2_file_t file);
extern errcode_t ext2fs_file_close(ext2_file_t file);
extern errcode_t ext2fs_file_read(ext2_file_t file, void *buf,
                          unsigned int wanted, unsigned int *got);
extern errcode_t ext2fs_file_write(ext2_file_t file, void *buf,
                           unsigned int nbytes, unsigned int *written);
extern errcode_t ext2fs_file_lseek(ext2_file_t file, ext2_off_t offset,
                           int whence, ext2_off_t *ret_pos);
extern ext2_off_t ext2fs_file_get_size(ext2_file_t file);
extern errcode_t ext2fs_file_set_size(ext2_file_t file, ext2_off_t size);

/* freefs.c */
extern void ext2fs_free(ext2_filsys fs);
extern void ext2fs_free_generic_bitmap(ext2fs_inode_bitmap bitmap);
extern void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap);
extern void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap);
extern void ext2fs_free_dblist(ext2_dblist dblist);
extern void ext2fs_badblocks_list_free(badblocks_list bb);

/* getsize.c */
extern errcode_t ext2fs_get_device_size(const char *file, int blocksize,
                              blk_t *retblocks);

/* initialize.c */
extern errcode_t ext2fs_initialize(const char *name, int flags,
                           struct ext2_super_block *param,
                           io_manager manager, ext2_filsys *ret_fs);

/* inode.c */
extern errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks,
                          ext2_inode_scan *ret_scan);
extern void ext2fs_close_inode_scan(ext2_inode_scan scan);
extern errcode_t ext2fs_get_next_inode(ext2_inode_scan scan, ino_t *ino,
                         struct ext2_inode *inode);
extern errcode_t ext2fs_inode_scan_goto_blockgroup(ext2_inode_scan scan,
                                       int      group);
extern void ext2fs_set_inode_callback
      (ext2_inode_scan scan,
       errcode_t (*done_group)(ext2_filsys fs,
                         ext2_inode_scan scan,
                         dgrp_t group,
                         void * priv_data),
       void *done_group_data);
extern int ext2fs_inode_scan_flags(ext2_inode_scan scan, int set_flags,
                           int clear_flags);
extern errcode_t ext2fs_read_inode (ext2_filsys fs, ino_t ino,
                      struct ext2_inode * inode);
extern errcode_t ext2fs_write_inode(ext2_filsys fs, ino_t ino,
                      struct ext2_inode * inode);
extern errcode_t ext2fs_get_blocks(ext2_filsys fs, ino_t ino, blk_t *blocks);
extern errcode_t ext2fs_check_directory(ext2_filsys fs, ino_t ino);

/* icount.c */
extern void ext2fs_free_icount(ext2_icount_t icount);
extern errcode_t ext2fs_create_icount2(ext2_filsys fs, int flags, int size,
                               ext2_icount_t hint, ext2_icount_t *ret);
extern errcode_t ext2fs_create_icount(ext2_filsys fs, int flags, int size,
                              ext2_icount_t *ret);
extern errcode_t ext2fs_icount_fetch(ext2_icount_t icount, ino_t ino,
                             __u16 *ret);
extern errcode_t ext2fs_icount_increment(ext2_icount_t icount, ino_t ino,
                               __u16 *ret);
extern errcode_t ext2fs_icount_decrement(ext2_icount_t icount, ino_t ino,
                               __u16 *ret);
extern errcode_t ext2fs_icount_store(ext2_icount_t icount, ino_t ino,
                             __u16 count);
extern ino_t ext2fs_get_icount_size(ext2_icount_t icount);
errcode_t ext2fs_icount_validate(ext2_icount_t icount, FILE *);

/* ismounted.c */
extern errcode_t ext2fs_check_if_mounted(const char *file, int *mount_flags);

/* namei.c */
extern errcode_t ext2fs_lookup(ext2_filsys fs, ino_t dir, const char *name,
                   int namelen, char *buf, ino_t *inode);
extern errcode_t ext2fs_namei(ext2_filsys fs, ino_t root, ino_t cwd,
                  const char *name, ino_t *inode);
errcode_t ext2fs_namei_follow(ext2_filsys fs, ino_t root, ino_t cwd,
                        const char *name, ino_t *inode);
extern errcode_t ext2fs_follow_link(ext2_filsys fs, ino_t root, ino_t cwd,
                  ino_t inode, ino_t *res_inode);

/* native.c */
int ext2fs_native_flag(void);

/* newdir.c */
extern errcode_t ext2fs_new_dir_block(ext2_filsys fs, ino_t dir_ino,
                        ino_t parent_ino, char **block);

/* mkdir.c */
extern errcode_t ext2fs_mkdir(ext2_filsys fs, ino_t parent, ino_t inum,
                        const char *name);

/* openfs.c */
extern errcode_t ext2fs_open(const char *name, int flags, int superblock,
                       int block_size, io_manager manager,
                       ext2_filsys *ret_fs);

/* get_pathname.c */
extern errcode_t ext2fs_get_pathname(ext2_filsys fs, ino_t dir, ino_t ino,
                         char **name);

/* link.c */
errcode_t ext2fs_link(ext2_filsys fs, ino_t dir, const char *name,
                  ino_t ino, int flags);
errcode_t ext2fs_unlink(ext2_filsys fs, ino_t dir, const char *name,
                  ino_t ino, int flags);

/* read_bb.c */
extern errcode_t ext2fs_read_bb_inode(ext2_filsys fs,
                              ext2_badblocks_list *bb_list);

/* read_bb_file.c */
extern errcode_t ext2fs_read_bb_FILE(ext2_filsys fs, FILE *f, 
                             ext2_badblocks_list *bb_list,
                             void (*invalid)(ext2_filsys fs,
                                         blk_t blk));

/* rs_bitmap.c */
extern errcode_t ext2fs_resize_generic_bitmap(__u32 new_end,
                                    __u32 new_real_end,
                                    ext2fs_generic_bitmap bmap);
extern errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
                                  ext2fs_inode_bitmap bmap);
extern errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
                                  ext2fs_block_bitmap bmap);
extern errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
                            ext2fs_generic_bitmap *dest);

/* swapfs.c */
extern void ext2fs_swap_super(struct ext2_super_block * super);
extern void ext2fs_swap_group_desc(struct ext2_group_desc *gdp);
extern void ext2fs_swap_inode(ext2_filsys fs,struct ext2_inode *t,
                        struct ext2_inode *f, int hostorder);

/* valid_blk.c */
extern int ext2fs_inode_has_valid_blocks(struct ext2_inode *inode);

/* version.c */
extern int ext2fs_parse_version_string(const char *ver_string);
extern int ext2fs_get_library_version(const char **ver_string,
                              const char **date_string);

/* inline functions */
extern errcode_t ext2fs_get_mem(unsigned long size, void **ptr);
extern errcode_t ext2fs_free_mem(void **ptr);
extern errcode_t ext2fs_resize_mem(unsigned long old_size,
                           unsigned long size, void **ptr);
extern void ext2fs_mark_super_dirty(ext2_filsys fs);
extern void ext2fs_mark_changed(ext2_filsys fs);
extern int ext2fs_test_changed(ext2_filsys fs);
extern void ext2fs_mark_valid(ext2_filsys fs);
extern void ext2fs_unmark_valid(ext2_filsys fs);
extern int ext2fs_test_valid(ext2_filsys fs);
extern void ext2fs_mark_ib_dirty(ext2_filsys fs);
extern void ext2fs_mark_bb_dirty(ext2_filsys fs);
extern int ext2fs_test_ib_dirty(ext2_filsys fs);
extern int ext2fs_test_bb_dirty(ext2_filsys fs);
extern int ext2fs_group_of_blk(ext2_filsys fs, blk_t blk);
extern int ext2fs_group_of_ino(ext2_filsys fs, ino_t ino);

/*
 * The actual inlined functions definitions themselves...
 *
 * If NO_INLINE_FUNCS is defined, then we won't try to do inline
 * functions at all!
 */
#if (defined(INCLUDE_INLINE_FUNCS) || !defined(NO_INLINE_FUNCS))
#ifdef INCLUDE_INLINE_FUNCS
#define _INLINE_ extern
#else
#ifdef __GNUC__
#define _INLINE_ extern __inline__
#else                   /* For Watcom C */
#define _INLINE_ extern inline
#endif
#endif

#ifndef EXT2_CUSTOM_MEMORY_ROUTINES
/*
 *  Allocate memory
 */
_INLINE_ errcode_t ext2fs_get_mem(unsigned long size, void **ptr)
{
      *ptr = malloc(size);
      if (!*ptr)
            return EXT2_ET_NO_MEMORY;
      return 0;
}

/*
 * Free memory
 */
_INLINE_ errcode_t ext2fs_free_mem(void **ptr)
{
      free(*ptr);
      *ptr = 0;
      return 0;
}
      
/*
 *  Resize memory
 */
_INLINE_ errcode_t ext2fs_resize_mem(unsigned long old_size,
                             unsigned long size, void **ptr)
{
      void *p;

      p = realloc(*ptr, size);
      if (!p)
            return EXT2_ET_NO_MEMORY;
      *ptr = p;
      return 0;
}
#endif      /* Custom memory routines */

/*
 * Mark a filesystem superblock as dirty
 */
_INLINE_ void ext2fs_mark_super_dirty(ext2_filsys fs)
{
      fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_CHANGED;
}

/*
 * Mark a filesystem as changed
 */
_INLINE_ void ext2fs_mark_changed(ext2_filsys fs)
{
      fs->flags |= EXT2_FLAG_CHANGED;
}

/*
 * Check to see if a filesystem has changed
 */
_INLINE_ int ext2fs_test_changed(ext2_filsys fs)
{
      return (fs->flags & EXT2_FLAG_CHANGED);
}

/*
 * Mark a filesystem as valid
 */
_INLINE_ void ext2fs_mark_valid(ext2_filsys fs)
{
      fs->flags |= EXT2_FLAG_VALID;
}

/*
 * Mark a filesystem as NOT valid
 */
_INLINE_ void ext2fs_unmark_valid(ext2_filsys fs)
{
      fs->flags &= ~EXT2_FLAG_VALID;
}

/*
 * Check to see if a filesystem is valid
 */
_INLINE_ int ext2fs_test_valid(ext2_filsys fs)
{
      return (fs->flags & EXT2_FLAG_VALID);
}

/*
 * Mark the inode bitmap as dirty
 */
_INLINE_ void ext2fs_mark_ib_dirty(ext2_filsys fs)
{
      fs->flags |= EXT2_FLAG_IB_DIRTY | EXT2_FLAG_CHANGED;
}

/*
 * Mark the block bitmap as dirty
 */
_INLINE_ void ext2fs_mark_bb_dirty(ext2_filsys fs)
{
      fs->flags |= EXT2_FLAG_BB_DIRTY | EXT2_FLAG_CHANGED;
}

/*
 * Check to see if a filesystem's inode bitmap is dirty
 */
_INLINE_ int ext2fs_test_ib_dirty(ext2_filsys fs)
{
      return (fs->flags & EXT2_FLAG_IB_DIRTY);
}

/*
 * Check to see if a filesystem's block bitmap is dirty
 */
_INLINE_ int ext2fs_test_bb_dirty(ext2_filsys fs)
{
      return (fs->flags & EXT2_FLAG_BB_DIRTY);
}

/*
 * Return the group # of a block
 */
_INLINE_ int ext2fs_group_of_blk(ext2_filsys fs, blk_t blk)
{
      return (blk - fs->super->s_first_data_block) /
            fs->super->s_blocks_per_group;
}

/*
 * Return the group # of an inode number
 */
_INLINE_ int ext2fs_group_of_ino(ext2_filsys fs, ino_t ino)
{
      return (ino - 1) / fs->super->s_inodes_per_group;
}
#undef _INLINE_
#endif

#endif /* _EXT2FS_EXT2FS_H */

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