busybox

/* vi: set sw=4 ts=4: */

/*

 * inode_io.c --- This is allows an inode in an ext2 filesystem image

 *  to be accessed via the I/O manager interface.

 *

 * Copyright (C) 2002 Theodore Ts'o.

 *

 * %Begin-Header%

 * This file may be redistributed under the terms of the GNU Public

 * License.

 * %End-Header%

 */

​

#include <stdio.h>

#include <string.h>

#if HAVE_UNISTD_H

#include <unistd.h>

#endif

#if HAVE_ERRNO_H

#include <errno.h>

#endif

#include <time.h>

​

#include "ext2_fs.h"

#include "ext2fs.h"

​

/*

 * For checking structure magic numbers...

 */

​

#define EXT2_CHECK_MAGIC(struct, code) \

      if ((struct)->magic != (code)) return (code)

​

struct inode_private_data {

    int             magic;

    char                name[32];

    ext2_file_t         file;

    ext2_filsys         fs;

    ext2_ino_t          ino;

    struct ext2_inode       inode;

    int             flags;

    struct inode_private_data   *next;

};

​

#define CHANNEL_HAS_INODE   0x8000

​

static struct inode_private_data *top_intern;

static int ino_unique = 0;

​

static errcode_t inode_open(const char *name, int flags, io_channel *channel);

static errcode_t inode_close(io_channel channel);

static errcode_t inode_set_blksize(io_channel channel, int blksize);

static errcode_t inode_read_blk(io_channel channel, unsigned long block,

                   int count, void *data);

static errcode_t inode_write_blk(io_channel channel, unsigned long block,

                int count, const void *data);

static errcode_t inode_flush(io_channel channel);

static errcode_t inode_write_byte(io_channel channel, unsigned long offset,

                int size, const void *data);

​

static struct struct_io_manager struct_inode_manager = {

    EXT2_ET_MAGIC_IO_MANAGER,

    "Inode I/O Manager",