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/*
* 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);
if (channel->private_data)
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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