e2fsprogs/ext2fs/test_io.c

   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 Public
   8  * License.
   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
  26 #include "ext2_fs.h"
  27 #include "ext2fs.h"
  28
  29 /*
  30  * For checking structure magic numbers...
  31  */
  32
  33 #define EXT2_CHECK_MAGIC(struct, code) \
  34           if ((struct)->magic != (code)) return (code)
  35
  36 struct test_private_data {
  37         int     magic;
  38         io_channel real;
  39         int flags;
  40         FILE *outfile;
  41         unsigned long block;
  42         int read_abort_count, write_abort_count;
  43         void (*read_blk)(unsigned long block, int count, errcode_t err);
  44         void (*write_blk)(unsigned long block, int count, errcode_t err);
  45         void (*set_blksize)(int blksize, errcode_t err);
  46         void (*write_byte)(unsigned long block, int count, errcode_t err);
  47 };
  48
  49 static errcode_t test_open(const char *name, int flags, io_channel *channel);
  50 static errcode_t test_close(io_channel channel);
  51 static errcode_t test_set_blksize(io_channel channel, int blksize);
  52 static errcode_t test_read_blk(io_channel channel, unsigned long block,
  53                                int count, void *data);
  54 static errcode_t test_write_blk(io_channel channel, unsigned long block,
  55                                 int count, const void *data);
  56 static errcode_t test_flush(io_channel channel);
  57 static errcode_t test_write_byte(io_channel channel, unsigned long offset,
  58                                  int count, const void *buf);
  59 static errcode_t test_set_option(io_channel channel, const char *option,
  60                                  const char *arg);
  61
  62 static struct struct_io_manager struct_test_manager = {
  63         EXT2_ET_MAGIC_IO_MANAGER,
  64         "Test I/O Manager",
  65         test_open,
  66         test_close,
  67         test_set_blksize,
  68         test_read_blk,
  69         test_write_blk,
  70         test_flush,
  71         test_write_byte,
  72         test_set_option
  73 };
  74
  75 io_manager test_io_manager = &struct_test_manager;
  76
  77 /*
  78  * These global variable can be set by the test program as
  79  * necessary *before* calling test_open
  80  */
  81 io_manager test_io_backing_manager = 0;
  82 void (*test_io_cb_read_blk)
  83         (unsigned long block, int count, errcode_t err) = 0;
  84 void (*test_io_cb_write_blk)
  85         (unsigned long block, int count, errcode_t err) = 0;
  86 void (*test_io_cb_set_blksize)
  87         (int blksize, errcode_t err) = 0;
  88 void (*test_io_cb_write_byte)
  89         (unsigned long block, int count, errcode_t err) = 0;
  90
  91 /*
  92  * Test flags
  93  */
  94 #define TEST_FLAG_READ                  0x01
  95 #define TEST_FLAG_WRITE                 0x02
  96 #define TEST_FLAG_SET_BLKSIZE           0x04
  97 #define TEST_FLAG_FLUSH                 0x08
  98 #define TEST_FLAG_DUMP                  0x10
  99 #define TEST_FLAG_SET_OPTION            0x20
 100
 101 static void test_dump_block(io_channel channel,
 102                             struct test_private_data *data,
 103                             unsigned long block, const void *buf)
 104 {
 105         const unsigned char *cp;
 106         FILE *f = data->outfile;
 107         int     i;
 108         unsigned long   cksum = 0;
 109
 110         for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
 111                 cksum += *cp;
 112         }
 113         fprintf(f, "Contents of block %lu, checksum %08lu: \n", block, cksum);
 114         for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
 115                 if ((i % 16) == 0)
 116                         fprintf(f, "%04x: ", i);
 117                 fprintf(f, "%02x%c", *cp, ((i % 16) == 15) ? '\n' : ' ');
 118         }
 119 }
 120
 121 static void test_abort(io_channel channel, unsigned long block)
 122 {
 123         struct test_private_data *data;
 124         FILE *f;
 125
 126         data = (struct test_private_data *) channel->private_data;
 127         f = data->outfile;
 128         test_flush(channel);
 129
 130         fprintf(f, "Aborting due to I/O to block %lu\n", block);
 131         fflush(f);
 132         abort();
 133 }
 134
 135 static errcode_t test_open(const char *name, int flags, io_channel *channel)
 136 {
 137         io_channel      io = NULL;
 138         struct test_private_data *data = NULL;
 139         errcode_t       retval;
 140         char            *value;
 141
 142         if (name == 0)
 143                 return EXT2_ET_BAD_DEVICE_NAME;
 144         retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io);
 145         if (retval)
 146                 return retval;
 147         memset(io, 0, sizeof(struct struct_io_channel));
 148         io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
 149         retval = ext2fs_get_mem(sizeof(struct test_private_data), &data);
 150         if (retval) {
 151                 retval = EXT2_ET_NO_MEMORY;
 152                 goto cleanup;
 153         }
 154         io->manager = test_io_manager;
 155         retval = ext2fs_get_mem(strlen(name)+1, &io->name);
 156         if (retval)
 157                 goto cleanup;
 158
 159         strcpy(io->name, name);
 160         io->private_data = data;
 161         io->block_size = 1024;
 162         io->read_error = 0;
 163         io->write_error = 0;
 164         io->refcount = 1;
 165
 166         memset(data, 0, sizeof(struct test_private_data));
 167         data->magic = EXT2_ET_MAGIC_TEST_IO_CHANNEL;
 168         if (test_io_backing_manager) {
 169                 retval = test_io_backing_manager->open(name, flags,
 170                                                        &data->real);
 171                 if (retval)
 172                         goto cleanup;
 173         } else
 174                 data->real = 0;
 175         data->read_blk =        test_io_cb_read_blk;
 176         data->write_blk =       test_io_cb_write_blk;
 177         data->set_blksize =     test_io_cb_set_blksize;
 178         data->write_byte =      test_io_cb_write_byte;
 179
 180         data->outfile = NULL;
 181         if ((value = getenv("TEST_IO_LOGFILE")) != NULL)
 182                 data->outfile = fopen(value, "w");
 183         if (!data->outfile)
 184                 data->outfile = stderr;
 185
 186         data->flags = 0;
 187         if ((value = getenv("TEST_IO_FLAGS")) != NULL)
 188                 data->flags = strtoul(value, NULL, 0);
 189
 190         data->block = 0;
 191         if ((value = getenv("TEST_IO_BLOCK")) != NULL)
 192                 data->block = strtoul(value, NULL, 0);
 193
 194         data->read_abort_count = 0;
 195         if ((value = getenv("TEST_IO_READ_ABORT")) != NULL)
 196                 data->read_abort_count = strtoul(value, NULL, 0);
 197
 198         data->write_abort_count = 0;
 199         if ((value = getenv("TEST_IO_WRITE_ABORT")) != NULL)
 200                 data->write_abort_count = strtoul(value, NULL, 0);
 201
 202         *channel = io;
 203         return 0;
 204
 205 cleanup:
 206         if (io)
 207                 ext2fs_free_mem(&io);
 208         if (data)
 209                 ext2fs_free_mem(&data);
 210         return retval;
 211 }
 212
 213 static errcode_t test_close(io_channel channel)
 214 {
 215         struct test_private_data *data;
 216         errcode_t       retval = 0;
 217
 218         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 219         data = (struct test_private_data *) channel->private_data;
 220         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 221
 222         if (--channel->refcount > 0)
 223                 return 0;
 224
 225         if (data->real)
 226                 retval = io_channel_close(data->real);
 227
 228         if (data->outfile && data->outfile != stderr)
 229                 fclose(data->outfile);
 230
 231         ext2fs_free_mem(&channel->private_data);
 232         if (channel->name)
 233                 ext2fs_free_mem(&channel->name);
 234         ext2fs_free_mem(&channel);
 235         return retval;
 236 }
 237
 238 static errcode_t test_set_blksize(io_channel channel, int blksize)
 239 {
 240         struct test_private_data *data;
 241         errcode_t       retval = 0;
 242
 243         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 244         data = (struct test_private_data *) channel->private_data;
 245         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 246
 247         if (data->real)
 248                 retval = io_channel_set_blksize(data->real, blksize);
 249         if (data->set_blksize)
 250                 data->set_blksize(blksize, retval);
 251         if (data->flags & TEST_FLAG_SET_BLKSIZE)
 252                 fprintf(data->outfile,
 253                         "Test_io: set_blksize(%d) returned %s\n",
 254                         blksize, retval ? error_message(retval) : "OK");
 255         channel->block_size = blksize;
 256         return retval;
 257 }
 258
 259
 260 static errcode_t test_read_blk(io_channel channel, unsigned long block,
 261                                int count, void *buf)
 262 {
 263         struct test_private_data *data;
 264         errcode_t       retval = 0;
 265
 266         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 267         data = (struct test_private_data *) channel->private_data;
 268         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 269
 270         if (data->real)
 271                 retval = io_channel_read_blk(data->real, block, count, buf);
 272         if (data->read_blk)
 273                 data->read_blk(block, count, retval);
 274         if (data->flags & TEST_FLAG_READ)
 275                 fprintf(data->outfile,
 276                         "Test_io: read_blk(%lu, %d) returned %s\n",
 277                         block, count, retval ? error_message(retval) : "OK");
 278         if (data->block && data->block == block) {
 279                 if (data->flags & TEST_FLAG_DUMP)
 280                         test_dump_block(channel, data, block, buf);
 281                 if (--data->read_abort_count == 0)
 282                         test_abort(channel, block);
 283         }
 284         return retval;
 285 }
 286
 287 static errcode_t test_write_blk(io_channel channel, unsigned long block,
 288                                int count, const void *buf)
 289 {
 290         struct test_private_data *data;
 291         errcode_t       retval = 0;
 292
 293         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 294         data = (struct test_private_data *) channel->private_data;
 295         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 296
 297         if (data->real)
 298                 retval = io_channel_write_blk(data->real, block, count, buf);
 299         if (data->write_blk)
 300                 data->write_blk(block, count, retval);
 301         if (data->flags & TEST_FLAG_WRITE)
 302                 fprintf(data->outfile,
 303                         "Test_io: write_blk(%lu, %d) returned %s\n",
 304                         block, count, retval ? error_message(retval) : "OK");
 305         if (data->block && data->block == block) {
 306                 if (data->flags & TEST_FLAG_DUMP)
 307                         test_dump_block(channel, data, block, buf);
 308                 if (--data->write_abort_count == 0)
 309                         test_abort(channel, block);
 310         }
 311         return retval;
 312 }
 313
 314 static errcode_t test_write_byte(io_channel channel, unsigned long offset,
 315                                int count, const void *buf)
 316 {
 317         struct test_private_data *data;
 318         errcode_t       retval = 0;
 319
 320         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 321         data = (struct test_private_data *) channel->private_data;
 322         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 323
 324         if (data->real && data->real->manager->write_byte)
 325                 retval = io_channel_write_byte(data->real, offset, count, buf);
 326         if (data->write_byte)
 327                 data->write_byte(offset, count, retval);
 328         if (data->flags & TEST_FLAG_WRITE)
 329                 fprintf(data->outfile,
 330                         "Test_io: write_byte(%lu, %d) returned %s\n",
 331                         offset, count, retval ? error_message(retval) : "OK");
 332         return retval;
 333 }
 334
 335 /*
 336  * Flush data buffers to disk.
 337  */
 338 static errcode_t test_flush(io_channel channel)
 339 {
 340         struct test_private_data *data;
 341         errcode_t       retval = 0;
 342
 343         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 344         data = (struct test_private_data *) channel->private_data;
 345         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 346
 347         if (data->real)
 348                 retval = io_channel_flush(data->real);
 349
 350         if (data->flags & TEST_FLAG_FLUSH)
 351                 fprintf(data->outfile, "Test_io: flush() returned %s\n",
 352                         retval ? error_message(retval) : "OK");
 353
 354         return retval;
 355 }
 356
 357 static errcode_t test_set_option(io_channel channel, const char *option,
 358                                  const char *arg)
 359 {
 360         struct test_private_data *data;
 361         errcode_t       retval = 0;
 362
 363         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
 364         data = (struct test_private_data *) channel->private_data;
 365         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
 366
 367
 368         if (data->flags & TEST_FLAG_SET_OPTION)
 369                 fprintf(data->outfile, "Test_io: set_option(%s, %s) ",
 370                         option, arg);
 371         if (data->real && data->real->manager->set_option) {
 372                 retval = (data->real->manager->set_option)(data->real,
 373                                                            option, arg);
 374                 if (data->flags & TEST_FLAG_SET_OPTION)
 375                         fprintf(data->outfile, "returned %s\n",
 376                                 retval ? error_message(retval) : "OK");
 377         } else {
 378                 if (data->flags & TEST_FLAG_SET_OPTION)
 379                         fprintf(data->outfile, "not implemented\n");
 380         }
 381         return retval;
 382 }