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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 Library
* General Public License, version 2.
* %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
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#else
#define PR_GET_DUMPABLE 3
#endif
#if (!defined(HAVE_PRCTL) && defined(linux))
#include <sys/syscall.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;
int flags;
FILE *outfile;
unsigned long block;
int read_abort_count, write_abort_count;
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);
void (*read_blk64)(unsigned long long block, int count, errcode_t err);
void (*write_blk64)(unsigned long 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_read_blk64(io_channel channel, unsigned long long block,
int count, void *data);
static errcode_t test_write_blk64(io_channel channel, unsigned long 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 errcode_t test_set_option(io_channel channel, const char *option,
const char *arg);
static errcode_t test_get_stats(io_channel channel, io_stats *stats);
static errcode_t test_discard(io_channel channel, unsigned long long block,
unsigned long long count);
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,
test_set_option,
test_get_stats,
test_read_blk64,
test_write_blk64,
test_discard,
};
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_read_blk64)
(unsigned long long block, int count, errcode_t err) = 0;
void (*test_io_cb_write_blk64)
(unsigned long 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;
/*
* Test flags
*/
#define TEST_FLAG_READ 0x01
#define TEST_FLAG_WRITE 0x02
#define TEST_FLAG_SET_BLKSIZE 0x04
#define TEST_FLAG_FLUSH 0x08
#define TEST_FLAG_DUMP 0x10
#define TEST_FLAG_SET_OPTION 0x20
#define TEST_FLAG_DISCARD 0x40
static void test_dump_block(io_channel channel,
struct test_private_data *data,
unsigned long block, const void *buf)
{
const unsigned char *cp;
FILE *f = data->outfile;
int i;
unsigned long cksum = 0;
for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
cksum += *cp;
}
fprintf(f, "Contents of block %lu, checksum %08lu: \n", block, cksum);
for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
if ((i % 16) == 0)
fprintf(f, "%04x: ", i);
fprintf(f, "%02x%c", *cp, ((i % 16) == 15) ? '\n' : ' ');
}
}
static void test_abort(io_channel channel, unsigned long block)
{
struct test_private_data *data;
FILE *f;
data = (struct test_private_data *) channel->private_data;
f = data->outfile;
test_flush(channel);
fprintf(f, "Aborting due to I/O to block %lu\n", block);
fflush(f);
abort();
}
static char *safe_getenv(const char *arg)
{
if ((getuid() != geteuid()) || (getgid() != getegid()))
return NULL;
#if HAVE_PRCTL
if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
return NULL;
#else
#if (defined(linux) && defined(SYS_prctl))
if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
return NULL;
#endif
#endif
#ifdef HAVE___SECURE_GETENV
return __secure_getenv(arg);
#else
return getenv(arg);
#endif
}
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;
char *value;
if (name == 0)
return EXT2_ET_BAD_DEVICE_NAME;
retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &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), &data);
if (retval) {
retval = EXT2_ET_NO_MEMORY;
goto cleanup;
}
io->manager = test_io_manager;
retval = ext2fs_get_mem(strlen(name)+1, &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;
data->read_blk64 = test_io_cb_read_blk64;
data->write_blk64 = test_io_cb_write_blk64;
data->outfile = NULL;
if ((value = safe_getenv("TEST_IO_LOGFILE")) != NULL)
data->outfile = fopen(value, "w");
if (!data->outfile)
data->outfile = stderr;
data->flags = 0;
if ((value = safe_getenv("TEST_IO_FLAGS")) != NULL)
data->flags = strtoul(value, NULL, 0);
data->block = 0;
if ((value = safe_getenv("TEST_IO_BLOCK")) != NULL)
data->block = strtoul(value, NULL, 0);
data->read_abort_count = 0;
if ((value = safe_getenv("TEST_IO_READ_ABORT")) != NULL)
data->read_abort_count = strtoul(value, NULL, 0);
data->write_abort_count = 0;
if ((value = safe_getenv("TEST_IO_WRITE_ABORT")) != NULL)
data->write_abort_count = strtoul(value, NULL, 0);
*channel = io;
return 0;
cleanup:
if (io)
ext2fs_free_mem(&io);
if (data)
ext2fs_free_mem(&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 (data->outfile && data->outfile != stderr)
fclose(data->outfile);
ext2fs_free_mem(&channel->private_data);
if (channel->name)
ext2fs_free_mem(&channel->name);
ext2fs_free_mem(&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);
if (data->flags & TEST_FLAG_SET_BLKSIZE)
fprintf(data->outfile,
"Test_io: set_blksize(%d) returned %s\n",
blksize, retval ? error_message(retval) : "OK");
channel->block_size = blksize;
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);
if (data->flags & TEST_FLAG_READ)
fprintf(data->outfile,
"Test_io: read_blk(%lu, %d) returned %s\n",
block, count, retval ? error_message(retval) : "OK");
if (data->block && data->block == block) {
if (data->flags & TEST_FLAG_DUMP)
test_dump_block(channel, data, block, buf);
if (--data->read_abort_count == 0)
test_abort(channel, block);
}
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);
if (data->flags & TEST_FLAG_WRITE)
fprintf(data->outfile,
"Test_io: write_blk(%lu, %d) returned %s\n",
block, count, retval ? error_message(retval) : "OK");
if (data->block && data->block == block) {
if (data->flags & TEST_FLAG_DUMP)
test_dump_block(channel, data, block, buf);
if (--data->write_abort_count == 0)
test_abort(channel, block);
}
return retval;
}
static errcode_t test_read_blk64(io_channel channel, unsigned long 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_blk64(data->real, block, count, buf);
if (data->read_blk64)
data->read_blk64(block, count, retval);
if (data->flags & TEST_FLAG_READ)
fprintf(data->outfile,
"Test_io: read_blk64(%llu, %d) returned %s\n",
block, count, retval ? error_message(retval) : "OK");
if (data->block && data->block == block) {
if (data->flags & TEST_FLAG_DUMP)
test_dump_block(channel, data, block, buf);
if (--data->read_abort_count == 0)
test_abort(channel, block);
}
return retval;
}
static errcode_t test_write_blk64(io_channel channel, unsigned long 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_blk64(data->real, block, count, buf);
if (data->write_blk64)
data->write_blk64(block, count, retval);
if (data->flags & TEST_FLAG_WRITE)
fprintf(data->outfile,
"Test_io: write_blk64(%llu, %d) returned %s\n",
block, count, retval ? error_message(retval) : "OK");
if (data->block && data->block == block) {
if (data->flags & TEST_FLAG_DUMP)
test_dump_block(channel, data, block, buf);
if (--data->write_abort_count == 0)
test_abort(channel, block);
}
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);
if (data->flags & TEST_FLAG_WRITE)
fprintf(data->outfile,
"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);
if (data->flags & TEST_FLAG_FLUSH)
fprintf(data->outfile, "Test_io: flush() returned %s\n",
retval ? error_message(retval) : "OK");
return retval;
}
static errcode_t test_set_option(io_channel channel, const char *option,
const char *arg)
{
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->flags & TEST_FLAG_SET_OPTION)
fprintf(data->outfile, "Test_io: set_option(%s, %s) ",
option, arg);
if (data->real && data->real->manager->set_option) {
retval = (data->real->manager->set_option)(data->real,
option, arg);
if (data->flags & TEST_FLAG_SET_OPTION)
fprintf(data->outfile, "returned %s\n",
retval ? error_message(retval) : "OK");
} else {
if (data->flags & TEST_FLAG_SET_OPTION)
fprintf(data->outfile, "not implemented\n");
}
return retval;
}
static errcode_t test_get_stats(io_channel channel, io_stats *stats)
{
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->get_stats) {
retval = (data->real->manager->get_stats)(data->real, stats);
}
return retval;
}
static errcode_t test_discard(io_channel channel, unsigned long long block,
unsigned long long count)
{
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_discard(data->real, block, count);
if (data->flags & TEST_FLAG_DISCARD)
fprintf(data->outfile,
"Test_io: discard(%llu, %llu) returned %s\n",
block, count, retval ? error_message(retval) : "OK");
return retval;
}
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