1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/*
* 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.is_error()) {
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;
}
|
