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test_io.c

/*
 * test_io.c --- This is the Test I/O interface.
 *
 * Copyright (C) 1996 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
#include <fcntl.h>
#include <time.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#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 test_private_data {
      int   magic;
      io_channel real;
      void (*read_blk)(unsigned long block, int count, errcode_t err);
      void (*write_blk)(unsigned long block, int count, errcode_t err);
      void (*set_blksize)(int blksize, errcode_t err);
      void (*write_byte)(unsigned long block, int count, errcode_t err);
};

static errcode_t test_open(const char *name, int flags, io_channel *channel);
static errcode_t test_close(io_channel channel);
static errcode_t test_set_blksize(io_channel channel, int blksize);
static errcode_t test_read_blk(io_channel channel, unsigned long block,
                         int count, void *data);
static errcode_t test_write_blk(io_channel channel, unsigned long block,
                        int count, const void *data);
static errcode_t test_flush(io_channel channel);
static errcode_t test_write_byte(io_channel channel, unsigned long offset,
                         int count, const void *buf);

static struct struct_io_manager struct_test_manager = {
      EXT2_ET_MAGIC_IO_MANAGER,
      "Test I/O Manager",
      test_open,
      test_close,
      test_set_blksize,
      test_read_blk,
      test_write_blk,
      test_flush,
      test_write_byte
      
};

io_manager test_io_manager = &struct_test_manager;

/*
 * These global variable can be set by the test program as
 * necessary *before* calling test_open
 */
io_manager test_io_backing_manager = 0;
void (*test_io_cb_read_blk)
      (unsigned long block, int count, errcode_t err) = 0;
void (*test_io_cb_write_blk)
      (unsigned long block, int count, errcode_t err) = 0;
void (*test_io_cb_set_blksize)
      (int blksize, errcode_t err) = 0;
void (*test_io_cb_write_byte)
      (unsigned long block, int count, errcode_t err) = 0;

static errcode_t test_open(const char *name, int flags, io_channel *channel)
{
      io_channel  io = NULL;
      struct test_private_data *data = NULL;
      errcode_t   retval;

      if (name == 0)
            return EXT2_ET_BAD_DEVICE_NAME;
      retval = ext2fs_get_mem(sizeof(struct struct_io_channel),
                        (void **) &io);
      if (retval)
            return retval;
      memset(io, 0, sizeof(struct struct_io_channel));
      io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
      retval = ext2fs_get_mem(sizeof(struct test_private_data),
                        (void **) &data);
      if (retval) {
            retval = EXT2_ET_NO_MEMORY;
            goto cleanup;
      }
      io->manager = test_io_manager;
      retval = ext2fs_get_mem(strlen(name)+1, (void **) &io->name);
      if (retval)
            goto cleanup;

      strcpy(io->name, name);
      io->private_data = data;
      io->block_size = 1024;
      io->read_error = 0;
      io->write_error = 0;
      io->refcount = 1;

      memset(data, 0, sizeof(struct test_private_data));
      data->magic = EXT2_ET_MAGIC_TEST_IO_CHANNEL;
      if (test_io_backing_manager) {
            retval = test_io_backing_manager->open(name, flags,
                                           &data->real);
            if (retval)
                  goto cleanup;
      } else
            data->real = 0;
      data->read_blk =  test_io_cb_read_blk;
      data->write_blk =       test_io_cb_write_blk;
      data->set_blksize =     test_io_cb_set_blksize;
      data->write_byte =      test_io_cb_write_byte;
      
      *channel = io;
      return 0;

cleanup:
      if (io)
            ext2fs_free_mem((void **) &io);
      if (data)
            ext2fs_free_mem((void **) &data);
      return retval;
}

static errcode_t test_close(io_channel channel)
{
      struct test_private_data *data;
      errcode_t   retval = 0;

      EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
      data = (struct test_private_data *) channel->private_data;
      EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);

      if (--channel->refcount > 0)
            return 0;
      
      if (data->real)
            retval = io_channel_close(data->real);
      
      ext2fs_free_mem((void **) &channel->private_data);
      if (channel->name)
            ext2fs_free_mem((void **) &channel->name);
      ext2fs_free_mem((void **) &channel);
      return retval;
}

static errcode_t test_set_blksize(io_channel channel, int blksize)
{
      struct test_private_data *data;
      errcode_t   retval = 0;

      EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
      data = (struct test_private_data *) channel->private_data;
      EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);

      if (data->real)
            retval = io_channel_set_blksize(data->real, blksize);
      if (data->set_blksize)
            data->set_blksize(blksize, retval);
      else
            printf("Test_io: set_blksize(%d) returned %s\n",
                   blksize, retval ? error_message(retval) : "OK");
      return retval;
}


static errcode_t test_read_blk(io_channel channel, unsigned long block,
                         int count, void *buf)
{
      struct test_private_data *data;
      errcode_t   retval = 0;

      EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
      data = (struct test_private_data *) channel->private_data;
      EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);

      if (data->real)
            retval = io_channel_read_blk(data->real, block, count, buf);
      if (data->read_blk)
            data->read_blk(block, count, retval);
      else
            printf("Test_io: read_blk(%lu, %d) returned %s\n",
                   block, count, retval ? error_message(retval) : "OK");
      return retval;
}

static errcode_t test_write_blk(io_channel channel, unsigned long block,
                         int count, const void *buf)
{
      struct test_private_data *data;
      errcode_t   retval = 0;

      EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
      data = (struct test_private_data *) channel->private_data;
      EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);

      if (data->real)
            retval = io_channel_write_blk(data->real, block, count, buf);
      if (data->write_blk)
            data->write_blk(block, count, retval);
      else
            printf("Test_io: write_blk(%lu, %d) returned %s\n",
                   block, count, retval ? error_message(retval) : "OK");
      return retval;
}

static errcode_t test_write_byte(io_channel channel, unsigned long offset,
                         int count, const void *buf)
{
      struct test_private_data *data;
      errcode_t   retval = 0;

      EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
      data = (struct test_private_data *) channel->private_data;
      EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);

      if (data->real && data->real->manager->write_byte)
            retval = io_channel_write_byte(data->real, offset, count, buf);
      if (data->write_byte)
            data->write_byte(offset, count, retval);
      else
            printf("Test_io: write_byte(%lu, %d) returned %s\n",
                   offset, count, retval ? error_message(retval) : "OK");
      return retval;
}

/*
 * Flush data buffers to disk.
 */
static errcode_t test_flush(io_channel channel)
{
      struct test_private_data *data;
      errcode_t   retval = 0;
      
      EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
      data = (struct test_private_data *) channel->private_data;
      EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);

      if (data->real)
            retval = io_channel_flush(data->real);
      
      printf("Test_io: flush() returned %s\n",
                   retval ? error_message(retval) : "OK");
      
      return retval;
}


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