| /* |
| * 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 <stdlib.h> |
| #include <fcntl.h> |
| #include <time.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #if HAVE_ERRNO_H |
| #include <errno.h> |
| #endif |
| |
| #include "et/com_err.h" |
| #include "ext2fs/ext2_err.h" |
| #include "io.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); |
| }; |
| |
| 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 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 |
| }; |
| |
| 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; |
| |
| 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; |
| io = (io_channel) malloc(sizeof(struct struct_io_channel)); |
| if (!io) |
| return ENOMEM; |
| memset(io, 0, sizeof(struct struct_io_channel)); |
| io->magic = EXT2_ET_MAGIC_IO_CHANNEL; |
| data = (struct test_private_data *) |
| malloc(sizeof(struct test_private_data)); |
| if (!data) { |
| retval = ENOMEM; |
| goto cleanup; |
| } |
| io->manager = test_io_manager; |
| io->name = malloc(strlen(name)+1); |
| if (!io->name) { |
| retval = ENOMEM; |
| 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; |
| |
| *channel = io; |
| return 0; |
| |
| cleanup: |
| if (io) |
| free(io); |
| if (data) |
| free(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) |
| free(channel->private_data); |
| if (channel->name) |
| free(channel->name); |
| free(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; |
| } |
| |
| /* |
| * Flush data buffers to disk. |
| */ |
| static errcode_t test_flush(io_channel channel) |
| { |
| struct test_private_data *data; |
| |
| 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) |
| return io_channel_flush(data->real); |
| return 0; |
| } |
| |