test_io.c revision 65f0aab98b20b5994a726ab90d355248bcddfffd
1/* 2 * test_io.c --- This is the Test I/O interface. 3 * 4 * Copyright (C) 1996 Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Library 8 * General Public License, version 2. 9 * %End-Header% 10 */ 11 12#include <stdio.h> 13#include <string.h> 14#if HAVE_UNISTD_H 15#include <unistd.h> 16#endif 17#include <fcntl.h> 18#include <time.h> 19#if HAVE_SYS_STAT_H 20#include <sys/stat.h> 21#endif 22#if HAVE_SYS_TYPES_H 23#include <sys/types.h> 24#endif 25#ifdef HAVE_SYS_PRCTL_H 26#include <sys/prctl.h> 27#else 28#define PR_GET_DUMPABLE 3 29#endif 30#if (!defined(HAVE_PRCTL) && defined(linux)) 31#include <sys/syscall.h> 32#endif 33 34#include "ext2_fs.h" 35#include "ext2fs.h" 36 37/* 38 * For checking structure magic numbers... 39 */ 40 41#define EXT2_CHECK_MAGIC(struct, code) \ 42 if ((struct)->magic != (code)) return (code) 43 44struct test_private_data { 45 int magic; 46 io_channel real; 47 int flags; 48 FILE *outfile; 49 unsigned long block; 50 int read_abort_count, write_abort_count; 51 void (*read_blk)(unsigned long block, int count, errcode_t err); 52 void (*write_blk)(unsigned long block, int count, errcode_t err); 53 void (*set_blksize)(int blksize, errcode_t err); 54 void (*write_byte)(unsigned long block, int count, errcode_t err); 55 void (*read_blk64)(unsigned long long block, int count, errcode_t err); 56 void (*write_blk64)(unsigned long long block, int count, errcode_t err); 57}; 58 59static errcode_t test_open(const char *name, int flags, io_channel *channel); 60static errcode_t test_close(io_channel channel); 61static errcode_t test_set_blksize(io_channel channel, int blksize); 62static errcode_t test_read_blk(io_channel channel, unsigned long block, 63 int count, void *data); 64static errcode_t test_write_blk(io_channel channel, unsigned long block, 65 int count, const void *data); 66static errcode_t test_read_blk64(io_channel channel, unsigned long long block, 67 int count, void *data); 68static errcode_t test_write_blk64(io_channel channel, unsigned long long block, 69 int count, const void *data); 70static errcode_t test_flush(io_channel channel); 71static errcode_t test_write_byte(io_channel channel, unsigned long offset, 72 int count, const void *buf); 73static errcode_t test_set_option(io_channel channel, const char *option, 74 const char *arg); 75static errcode_t test_get_stats(io_channel channel, io_stats *stats); 76 77 78static struct struct_io_manager struct_test_manager = { 79 EXT2_ET_MAGIC_IO_MANAGER, 80 "Test I/O Manager", 81 test_open, 82 test_close, 83 test_set_blksize, 84 test_read_blk, 85 test_write_blk, 86 test_flush, 87 test_write_byte, 88 test_set_option, 89 test_get_stats, 90 test_read_blk64, 91 test_write_blk64, 92}; 93 94io_manager test_io_manager = &struct_test_manager; 95 96/* 97 * These global variable can be set by the test program as 98 * necessary *before* calling test_open 99 */ 100io_manager test_io_backing_manager = 0; 101void (*test_io_cb_read_blk) 102 (unsigned long block, int count, errcode_t err) = 0; 103void (*test_io_cb_write_blk) 104 (unsigned long block, int count, errcode_t err) = 0; 105void (*test_io_cb_read_blk64) 106 (unsigned long long block, int count, errcode_t err) = 0; 107void (*test_io_cb_write_blk64) 108 (unsigned long long block, int count, errcode_t err) = 0; 109void (*test_io_cb_set_blksize) 110 (int blksize, errcode_t err) = 0; 111void (*test_io_cb_write_byte) 112 (unsigned long block, int count, errcode_t err) = 0; 113 114/* 115 * Test flags 116 */ 117#define TEST_FLAG_READ 0x01 118#define TEST_FLAG_WRITE 0x02 119#define TEST_FLAG_SET_BLKSIZE 0x04 120#define TEST_FLAG_FLUSH 0x08 121#define TEST_FLAG_DUMP 0x10 122#define TEST_FLAG_SET_OPTION 0x20 123 124static void test_dump_block(io_channel channel, 125 struct test_private_data *data, 126 unsigned long block, const void *buf) 127{ 128 const unsigned char *cp; 129 FILE *f = data->outfile; 130 int i; 131 unsigned long cksum = 0; 132 133 for (i=0, cp = buf; i < channel->block_size; i++, cp++) { 134 cksum += *cp; 135 } 136 fprintf(f, "Contents of block %lu, checksum %08lu: \n", block, cksum); 137 for (i=0, cp = buf; i < channel->block_size; i++, cp++) { 138 if ((i % 16) == 0) 139 fprintf(f, "%04x: ", i); 140 fprintf(f, "%02x%c", *cp, ((i % 16) == 15) ? '\n' : ' '); 141 } 142} 143 144static void test_abort(io_channel channel, unsigned long block) 145{ 146 struct test_private_data *data; 147 FILE *f; 148 149 data = (struct test_private_data *) channel->private_data; 150 f = data->outfile; 151 test_flush(channel); 152 153 fprintf(f, "Aborting due to I/O to block %lu\n", block); 154 fflush(f); 155 abort(); 156} 157 158static char *safe_getenv(const char *arg) 159{ 160 if ((getuid() != geteuid()) || (getgid() != getegid())) 161 return NULL; 162#if HAVE_PRCTL 163 if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0) 164 return NULL; 165#else 166#if (defined(linux) && defined(SYS_prctl)) 167 if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0) 168 return NULL; 169#endif 170#endif 171 172#ifdef HAVE___SECURE_GETENV 173 return __secure_getenv(arg); 174#else 175 return getenv(arg); 176#endif 177} 178 179static errcode_t test_open(const char *name, int flags, io_channel *channel) 180{ 181 io_channel io = NULL; 182 struct test_private_data *data = NULL; 183 errcode_t retval; 184 char *value; 185 186 if (name == 0) 187 return EXT2_ET_BAD_DEVICE_NAME; 188 retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io); 189 if (retval) 190 return retval; 191 memset(io, 0, sizeof(struct struct_io_channel)); 192 io->magic = EXT2_ET_MAGIC_IO_CHANNEL; 193 retval = ext2fs_get_mem(sizeof(struct test_private_data), &data); 194 if (retval) { 195 retval = EXT2_ET_NO_MEMORY; 196 goto cleanup; 197 } 198 io->manager = test_io_manager; 199 retval = ext2fs_get_mem(strlen(name)+1, &io->name); 200 if (retval) 201 goto cleanup; 202 203 strcpy(io->name, name); 204 io->private_data = data; 205 io->block_size = 1024; 206 io->read_error = 0; 207 io->write_error = 0; 208 io->refcount = 1; 209 210 memset(data, 0, sizeof(struct test_private_data)); 211 data->magic = EXT2_ET_MAGIC_TEST_IO_CHANNEL; 212 if (test_io_backing_manager) { 213 retval = test_io_backing_manager->open(name, flags, 214 &data->real); 215 if (retval) 216 goto cleanup; 217 } else 218 data->real = 0; 219 data->read_blk = test_io_cb_read_blk; 220 data->write_blk = test_io_cb_write_blk; 221 data->set_blksize = test_io_cb_set_blksize; 222 data->write_byte = test_io_cb_write_byte; 223 data->read_blk64 = test_io_cb_read_blk64; 224 data->write_blk64 = test_io_cb_write_blk64; 225 226 data->outfile = NULL; 227 if ((value = safe_getenv("TEST_IO_LOGFILE")) != NULL) 228 data->outfile = fopen(value, "w"); 229 if (!data->outfile) 230 data->outfile = stderr; 231 232 data->flags = 0; 233 if ((value = safe_getenv("TEST_IO_FLAGS")) != NULL) 234 data->flags = strtoul(value, NULL, 0); 235 236 data->block = 0; 237 if ((value = safe_getenv("TEST_IO_BLOCK")) != NULL) 238 data->block = strtoul(value, NULL, 0); 239 240 data->read_abort_count = 0; 241 if ((value = safe_getenv("TEST_IO_READ_ABORT")) != NULL) 242 data->read_abort_count = strtoul(value, NULL, 0); 243 244 data->write_abort_count = 0; 245 if ((value = safe_getenv("TEST_IO_WRITE_ABORT")) != NULL) 246 data->write_abort_count = strtoul(value, NULL, 0); 247 248 *channel = io; 249 return 0; 250 251cleanup: 252 if (io) 253 ext2fs_free_mem(&io); 254 if (data) 255 ext2fs_free_mem(&data); 256 return retval; 257} 258 259static errcode_t test_close(io_channel channel) 260{ 261 struct test_private_data *data; 262 errcode_t retval = 0; 263 264 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); 265 data = (struct test_private_data *) channel->private_data; 266 EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL); 267 268 if (--channel->refcount > 0) 269 return 0; 270 271 if (data->real) 272 retval = io_channel_close(data->real); 273 274 if (data->outfile && data->outfile != stderr) 275 fclose(data->outfile); 276 277 ext2fs_free_mem(&channel->private_data); 278 if (channel->name) 279 ext2fs_free_mem(&channel->name); 280 ext2fs_free_mem(&channel); 281 return retval; 282} 283 284static errcode_t test_set_blksize(io_channel channel, int blksize) 285{ 286 struct test_private_data *data; 287 errcode_t retval = 0; 288 289 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); 290 data = (struct test_private_data *) channel->private_data; 291 EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL); 292 293 if (data->real) 294 retval = io_channel_set_blksize(data->real, blksize); 295 if (data->set_blksize) 296 data->set_blksize(blksize, retval); 297 if (data->flags & TEST_FLAG_SET_BLKSIZE) 298 fprintf(data->outfile, 299 "Test_io: set_blksize(%d) returned %s\n", 300 blksize, retval ? error_message(retval) : "OK"); 301 channel->block_size = blksize; 302 return retval; 303} 304 305 306static errcode_t test_read_blk(io_channel channel, unsigned long block, 307 int count, void *buf) 308{ 309 struct test_private_data *data; 310 errcode_t retval = 0; 311 312 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); 313 data = (struct test_private_data *) channel->private_data; 314 EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL); 315 316 if (data->real) 317 retval = io_channel_read_blk(data->real, block, count, buf); 318 if (data->read_blk) 319 data->read_blk(block, count, retval); 320 if (data->flags & TEST_FLAG_READ) 321 fprintf(data->outfile, 322 "Test_io: read_blk(%lu, %d) returned %s\n", 323 block, count, retval ? error_message(retval) : "OK"); 324 if (data->block && data->block == block) { 325 if (data->flags & TEST_FLAG_DUMP) 326 test_dump_block(channel, data, block, buf); 327 if (--data->read_abort_count == 0) 328 test_abort(channel, block); 329 } 330 return retval; 331} 332 333static errcode_t test_write_blk(io_channel channel, unsigned long block, 334 int count, const void *buf) 335{ 336 struct test_private_data *data; 337 errcode_t retval = 0; 338 339 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); 340 data = (struct test_private_data *) channel->private_data; 341 EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL); 342 343 if (data->real) 344 retval = io_channel_write_blk(data->real, block, count, buf); 345 if (data->write_blk) 346 data->write_blk(block, count, retval); 347 if (data->flags & TEST_FLAG_WRITE) 348 fprintf(data->outfile, 349 "Test_io: write_blk(%lu, %d) returned %s\n", 350 block, count, retval ? error_message(retval) : "OK"); 351 if (data->block && data->block == block) { 352 if (data->flags & TEST_FLAG_DUMP) 353 test_dump_block(channel, data, block, buf); 354 if (--data->write_abort_count == 0) 355 test_abort(channel, block); 356 } 357 return retval; 358} 359 360static errcode_t test_read_blk64(io_channel channel, unsigned long long block, 361 int count, void *buf) 362{ 363 struct test_private_data *data; 364 errcode_t retval = 0; 365 366 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); 367 data = (struct test_private_data *) channel->private_data; 368 EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL); 369 370 if (data->real) 371 retval = io_channel_read_blk64(data->real, block, count, buf); 372 if (data->read_blk64) 373 data->read_blk64(block, count, retval); 374 if (data->flags & TEST_FLAG_READ) 375 fprintf(data->outfile, 376 "Test_io: read_blk64(%llu, %d) returned %s\n", 377 block, count, retval ? error_message(retval) : "OK"); 378 if (data->block && data->block == block) { 379 if (data->flags & TEST_FLAG_DUMP) 380 test_dump_block(channel, data, block, buf); 381 if (--data->read_abort_count == 0) 382 test_abort(channel, block); 383 } 384 return retval; 385} 386 387static errcode_t test_write_blk64(io_channel channel, unsigned long long block, 388 int count, const void *buf) 389{ 390 struct test_private_data *data; 391 errcode_t retval = 0; 392 393 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); 394 data = (struct test_private_data *) channel->private_data; 395 EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL); 396 397 if (data->real) 398 retval = io_channel_write_blk64(data->real, block, count, buf); 399 if (data->write_blk64) 400 data->write_blk64(block, count, retval); 401 if (data->flags & TEST_FLAG_WRITE) 402 fprintf(data->outfile, 403 "Test_io: write_blk64(%llu, %d) returned %s\n", 404 block, count, retval ? error_message(retval) : "OK"); 405 if (data->block && data->block == block) { 406 if (data->flags & TEST_FLAG_DUMP) 407 test_dump_block(channel, data, block, buf); 408 if (--data->write_abort_count == 0) 409 test_abort(channel, block); 410 } 411 return retval; 412} 413 414static errcode_t test_write_byte(io_channel channel, unsigned long offset, 415 int count, const void *buf) 416{ 417 struct test_private_data *data; 418 errcode_t retval = 0; 419 420 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); 421 data = (struct test_private_data *) channel->private_data; 422 EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL); 423 424 if (data->real && data->real->manager->write_byte) 425 retval = io_channel_write_byte(data->real, offset, count, buf); 426 if (data->write_byte) 427 data->write_byte(offset, count, retval); 428 if (data->flags & TEST_FLAG_WRITE) 429 fprintf(data->outfile, 430 "Test_io: write_byte(%lu, %d) returned %s\n", 431 offset, count, retval ? error_message(retval) : "OK"); 432 return retval; 433} 434 435/* 436 * Flush data buffers to disk. 437 */ 438static errcode_t test_flush(io_channel channel) 439{ 440 struct test_private_data *data; 441 errcode_t retval = 0; 442 443 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); 444 data = (struct test_private_data *) channel->private_data; 445 EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL); 446 447 if (data->real) 448 retval = io_channel_flush(data->real); 449 450 if (data->flags & TEST_FLAG_FLUSH) 451 fprintf(data->outfile, "Test_io: flush() returned %s\n", 452 retval ? error_message(retval) : "OK"); 453 454 return retval; 455} 456 457static errcode_t test_set_option(io_channel channel, const char *option, 458 const char *arg) 459{ 460 struct test_private_data *data; 461 errcode_t retval = 0; 462 463 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); 464 data = (struct test_private_data *) channel->private_data; 465 EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL); 466 467 468 if (data->flags & TEST_FLAG_SET_OPTION) 469 fprintf(data->outfile, "Test_io: set_option(%s, %s) ", 470 option, arg); 471 if (data->real && data->real->manager->set_option) { 472 retval = (data->real->manager->set_option)(data->real, 473 option, arg); 474 if (data->flags & TEST_FLAG_SET_OPTION) 475 fprintf(data->outfile, "returned %s\n", 476 retval ? error_message(retval) : "OK"); 477 } else { 478 if (data->flags & TEST_FLAG_SET_OPTION) 479 fprintf(data->outfile, "not implemented\n"); 480 } 481 return retval; 482} 483 484static errcode_t test_get_stats(io_channel channel, io_stats *stats) 485{ 486 struct test_private_data *data; 487 errcode_t retval = 0; 488 489 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); 490 data = (struct test_private_data *) channel->private_data; 491 EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL); 492 493 if (data->real && data->real->manager->get_stats) { 494 retval = (data->real->manager->get_stats)(data->real, stats); 495 } 496 return retval; 497} 498