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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Random.h>
#include <LibCore/ArgsParser.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
bool verify_block(int fd, int seed, off_t block, AK::ByteBuffer& buffer);
bool write_block(int fd, int seed, off_t block, AK::ByteBuffer& buffer);
bool verify_block(int fd, int seed, off_t block, AK::ByteBuffer& buffer)
{
auto offset = block * buffer.size();
auto rs = lseek(fd, offset, SEEK_SET);
if (rs < 0) {
fprintf(stderr, "Couldn't seek to block %" PRIi64 " (offset %" PRIi64 ") while verifying: %s\n", block, offset, strerror(errno));
return false;
}
auto rw = read(fd, buffer.data(), buffer.size());
if (rw != static_cast<int>(buffer.size())) {
fprintf(stderr, "Failure to read block %" PRIi64 ": %s\n", block, strerror(errno));
return false;
}
srand((seed + 1) * (block + 1));
for (size_t i = 0; i < buffer.size(); i++) {
if (buffer[i] != rand() % 256) {
fprintf(stderr, "Discrepancy detected at block %" PRIi64 " offset %zd\n", block, i);
return false;
}
}
return true;
}
bool write_block(int fd, int seed, off_t block, AK::ByteBuffer& buffer)
{
auto offset = block * buffer.size();
auto rs = lseek(fd, offset, SEEK_SET);
if (rs < 0) {
fprintf(stderr, "Couldn't seek to block %" PRIi64 " (offset %" PRIi64 ") while verifying: %s\n", block, offset, strerror(errno));
return false;
}
srand((seed + 1) * (block + 1));
for (size_t i = 0; i < buffer.size(); i++)
buffer[i] = rand();
auto rw = write(fd, buffer.data(), buffer.size());
if (rw != static_cast<int>(buffer.size())) {
fprintf(stderr, "Failure to write block %" PRIi64 ": %s\n", block, strerror(errno));
return false;
}
return true;
}
int main(int argc, char** argv)
{
const char* target = nullptr;
int min_block_offset = 0;
int block_length = 2048;
int block_size = 512;
int count = 1024;
int rng_seed = 0;
bool paranoid_mode = false;
bool random_mode = false;
bool stop_mode = false;
bool uninitialized_mode = false;
Core::ArgsParser args_parser;
args_parser.add_option(min_block_offset, "Minimum block offset to consider", "min-offset", 'o', "size");
args_parser.add_option(block_length, "Number of blocks to consider", "length", 's', "size");
args_parser.add_option(block_size, "Block size", "block-size", 'b', "size");
args_parser.add_option(count, "Number of write/read cycles to run", "number", 'n', "number");
args_parser.add_option(rng_seed, "Random number generator seed", "seed", 'S', "number");
args_parser.add_option(paranoid_mode, "Check entire range for consistency after each write", "paranoid", 'p');
args_parser.add_option(random_mode, "Write one block inside range at random", "random", 'r');
args_parser.add_option(stop_mode, "Stop after first error", "abort-on-error", 'a');
args_parser.add_option(uninitialized_mode, "Don't pre-initialize block range", "uninitialized", 'u');
args_parser.add_positional_argument(target, "Target device/file path", "target");
args_parser.parse(argc, argv);
auto buffer_result = AK::ByteBuffer::create_zeroed(block_size);
if (!buffer_result.has_value()) {
warnln("Failed to allocate a buffer of {} bytes", block_size);
return EXIT_FAILURE;
}
auto buffer = buffer_result.release_value();
int fd = open(target, O_CREAT | O_RDWR, 0666);
if (fd < 0) {
perror("Couldn't create target file");
return EXIT_FAILURE;
}
if (!uninitialized_mode) {
int old_percent = -100;
for (int i = min_block_offset; i < min_block_offset + block_length; i++) {
int percent;
if (block_length <= 1)
percent = 100;
else
percent = 100 * (i - min_block_offset) / (block_length - 1);
if (old_percent != percent) {
printf("Pre-initializing entire block range (%3d%%)...\n", percent);
old_percent = percent;
}
if (!write_block(fd, rng_seed, i, buffer))
return EXIT_FAILURE;
}
}
int r = EXIT_SUCCESS;
for (int i = 0; i < count; i++) {
printf("(%d/%d)\tPass %d...\n", i + 1, count, i + 1);
for (int j = min_block_offset; j < min_block_offset + block_length; j++) {
off_t block;
if (random_mode)
while ((block = AK::get_random<off_t>()) < 0)
;
else
block = j;
block = min_block_offset + block % block_length;
if (paranoid_mode) {
for (int k = min_block_offset; j < min_block_offset + block_length; j++) {
if (!verify_block(fd, rng_seed, k, buffer)) {
if (stop_mode)
return EXIT_FAILURE;
else
r = EXIT_FAILURE;
}
}
} else {
if (!verify_block(fd, rng_seed, block, buffer)) {
if (stop_mode)
return EXIT_FAILURE;
else
r = EXIT_FAILURE;
}
}
if (!write_block(fd, rng_seed, block, buffer)) {
if (stop_mode)
return EXIT_FAILURE;
else
r = EXIT_FAILURE;
}
}
}
close(fd);
return r;
}
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