misc/badblocks.c

   1 /*
   2  * badblocks.c          - Bad blocks checker
   3  *
   4  * Copyright (C) 1992, 1993, 1994  Remy Card <card@masi.ibp.fr>
   5  *                                 Laboratoire MASI, Institut Blaise Pascal
   6  *                                 Universite Pierre et Marie Curie (Paris VI)
   7  *
   8  * Copyright 1995, 1996, 1997 by Theodore Ts'o
   9  *
  10  * This file is based on the minix file system programs fsck and mkfs
  11  * written and copyrighted by Linus Torvalds <Linus.Torvalds@cs.helsinki.fi>
  12  *
  13  * %Begin-Header%
  14  * This file may be redistributed under the terms of the GNU Public
  15  * License.
  16  * %End-Header%
  17  */
  18
  19 /*
  20  * History:
  21  * 93/05/26     - Creation from e2fsck
  22  * 94/02/27     - Made a separate bad blocks checker
  23  */
  24
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #ifdef HAVE_GETOPT_H
  28 #include <getopt.h>
  29 #endif
  30 #include <signal.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35
  36 #include <sys/ioctl.h>
  37 #include <sys/types.h>
  38
  39 #if HAVE_LINUX_FS_H
  40 #include <linux/fd.h>
  41 #include <linux/fs.h>
  42 #endif
  43
  44 #include "et/com_err.h"
  45 #include "ext2fs/io.h"
  46
  47 const char * program_name = "badblocks";
  48
  49 int v_flag = 0;                 /* verbose */
  50 int w_flag = 0;                 /* do r/w test */
  51 int s_flag = 0;                 /* show progress of test */
  52
  53 static volatile void usage (void)
  54 {
  55         fprintf (stderr, "Usage: %s [-b block_size] [-o output_file] [-svw] device blocks_count\n [start_count]\n",
  56                  program_name);
  57         exit (1);
  58 }
  59
  60 static unsigned long currently_testing = 0;
  61 static unsigned long num_blocks = 0;
  62
  63 static void print_status(void)
  64 {
  65         fprintf(stderr, "%9ld/%9ld", currently_testing, num_blocks);
  66         fprintf(stderr, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
  67         fflush (stderr);
  68 }
  69
  70 static void alarm_intr (int alnum)
  71 {
  72         signal (SIGALRM, alarm_intr);
  73         alarm(1);
  74         if (!num_blocks)
  75                 return;
  76         fprintf(stderr, "%9ld/%9ld", currently_testing, num_blocks);
  77         fprintf(stderr, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
  78         fflush (stderr);
  79 }
  80
  81 /*
  82  * Perform a test of a block; return the number of blocks readable/writeable.
  83  */
  84 static long do_test (int dev, char * buffer, int try, unsigned long block_size,
  85                      unsigned long current_block)
  86 {
  87         long got;
  88
  89         if (v_flag > 1)
  90                 print_status();
  91
  92         /* Seek to the correct loc. */
  93         if (ext2fs_llseek (dev, (ext2_loff_t) current_block * block_size,
  94                          SEEK_SET) != (ext2_loff_t) current_block * block_size)
  95                 com_err (program_name, errno, "during seek");
  96
  97         /* Try the read */
  98         got = read (dev, buffer, try * block_size);
  99         if (got < 0)
 100                 got = 0;
 101         if (got & (block_size - 1))
 102                 fprintf (stderr,
 103                          "Weird value (%ld) in do_test: probably bugs\n",
 104                          got);
 105         got /= block_size;
 106         return got;
 107 }
 108
 109 static void flush_bufs (int dev, int sync)
 110 {
 111   if (v_flag
 112 #if !defined (BLKFLSBUF) && !defined (FDFLUSH)
 113       && sync
 114 #endif
 115       )
 116     fprintf (stderr, "Flushing buffers\n");
 117
 118   if (sync && fsync (dev) == -1)
 119     com_err (program_name, errno, "during fsync");
 120
 121 #ifdef BLKLSBUF
 122   ioctl (dev, BLKFLSBUF, 0);    /* In case this is a HD */
 123 #endif
 124 #ifdef FDFLUSH
 125   ioctl (dev, FDFLUSH, 0);      /* In case this is floppy */
 126 #endif
 127 }
 128
 129 static void test_ro (int dev, unsigned long blocks_count,
 130                      unsigned long block_size, FILE * out,
 131                      unsigned long from_count)
 132 {
 133 #define TEST_BUFFER_BLOCKS 16
 134         char * blkbuf;
 135         int try;
 136         long got;
 137
 138         blkbuf = malloc (TEST_BUFFER_BLOCKS * block_size);
 139         if (!blkbuf)
 140         {
 141                 com_err (program_name, ENOMEM, "while allocating buffers");
 142                 exit (1);
 143         }
 144         flush_bufs (dev, 0);
 145         if (v_flag) {
 146             fprintf (stderr,
 147                      "Checking for bad blocks in read-only mode\n");
 148             fprintf (stderr, "From block %lu to %lu\n", from_count, blocks_count);
 149         }
 150         try = TEST_BUFFER_BLOCKS;
 151         currently_testing = from_count;
 152         num_blocks = blocks_count;
 153         if (s_flag || v_flag > 1) {
 154                 fprintf(stderr, "Checking for bad blocks (read-only test): ");
 155                 if (v_flag <= 1)
 156                         alarm_intr(SIGALRM);
 157         }
 158         while (currently_testing < blocks_count)
 159         {
 160                 if (currently_testing + try > blocks_count)
 161                         try = blocks_count - currently_testing;
 162                 got = do_test (dev, blkbuf, try, block_size, currently_testing);
 163                 currently_testing += got;
 164                 if (got == try) {
 165                         try = TEST_BUFFER_BLOCKS;
 166                         continue;
 167                 }
 168                 else
 169                         try = 1;
 170                 if (got == 0)
 171                         fprintf (out, "%lu\n", currently_testing++);
 172         }
 173         num_blocks = 0;
 174         alarm(0);
 175         if (s_flag || v_flag > 1)
 176                 fprintf(stderr, "done               \n");
 177         fflush (stderr);
 178         free (blkbuf);
 179 }
 180
 181 static void test_rw (int dev, unsigned long blocks_count,
 182                      unsigned long block_size, FILE * out,
 183                      unsigned long from_count)
 184 {
 185         int i;
 186         char * buffer;
 187         unsigned char pattern[] = {0xaa, 0x55, 0xff, 0x00};
 188
 189         buffer = malloc (2 * block_size);
 190         if (!buffer)
 191         {
 192                 com_err (program_name, ENOMEM, "while allocating buffers");
 193                 exit (1);
 194         }
 195
 196         flush_bufs (dev, 0);
 197
 198         if (v_flag) {
 199                 fprintf(stderr,
 200                         "Checking for bad blocks in read-write mode\n");
 201                 fprintf(stderr, "From block %lu to %lu\n",
 202                          from_count, blocks_count);
 203         }
 204         for (i = 0; i < sizeof (pattern); i++) {
 205                 memset (buffer, pattern[i], block_size);
 206                 if (s_flag | v_flag)
 207                         fprintf (stderr, "Writing pattern 0x%08x: ",
 208                                  *((int *) buffer));
 209                 num_blocks = blocks_count;
 210                 currently_testing = from_count;
 211                 if (s_flag && v_flag <= 1)
 212                         alarm_intr(SIGALRM);
 213                 for (;
 214                      currently_testing < blocks_count;
 215                      currently_testing++)
 216                 {
 217                         if (ext2fs_llseek (dev, (ext2_loff_t) currently_testing *
 218                                          block_size, SEEK_SET) !=
 219                             (ext2_loff_t) currently_testing * block_size)
 220                                 com_err (program_name, errno,
 221                                          "during seek on block %d",
 222                                          currently_testing);
 223                         if (v_flag > 1)
 224                                 print_status();
 225                         write (dev, buffer, block_size);
 226                 }
 227                 num_blocks = 0;
 228                 alarm (0);
 229                 if (s_flag | v_flag)
 230                         fprintf(stderr, "done               \n");
 231                 flush_bufs (dev, 1);
 232                 if (s_flag | v_flag)
 233                         fprintf (stderr, "Reading and comparing: ");
 234                 num_blocks = blocks_count;
 235                 currently_testing = from_count;
 236                 if (s_flag && v_flag <= 1)
 237                         alarm_intr(SIGALRM);
 238                 for (;
 239                      currently_testing < blocks_count;
 240                      currently_testing++)
 241                 {
 242                         if (ext2fs_llseek (dev, (ext2_loff_t) currently_testing *
 243                                          block_size, SEEK_SET) !=
 244                             (ext2_loff_t) currently_testing * block_size)
 245                                 com_err (program_name, errno,
 246                                          "during seek on block %d",
 247                                          currently_testing);
 248                         if (v_flag > 1)
 249                                 print_status();
 250                         if (read (dev, buffer + block_size, block_size) < block_size)
 251                                 fprintf (out, "%ld\n", currently_testing);
 252                         else if (memcmp (buffer, buffer + block_size, block_size))
 253                                 fprintf (out, "%ld\n", currently_testing);
 254                 }
 255                 num_blocks = 0;
 256                 alarm (0);
 257                 if (s_flag | v_flag)
 258                         fprintf(stderr, "done           \n");
 259                 flush_bufs (dev, 0);
 260         }
 261 }
 262
 263 void main (int argc, char ** argv)
 264 {
 265         char c;
 266         char * tmp;
 267         char * device_name;
 268         char * output_file = NULL;
 269         FILE * out;
 270         unsigned long block_size = 1024;
 271         unsigned long blocks_count, from_count;
 272         int dev;
 273
 274         setbuf(stdout, NULL);
 275         setbuf(stderr, NULL);
 276         if (argc && *argv)
 277                 program_name = *argv;
 278         while ((c = getopt (argc, argv, "b:o:svw")) != EOF) {
 279                 switch (c) {
 280                 case 'b':
 281                         block_size = strtoul (optarg, &tmp, 0);
 282                         if (*tmp || block_size > 4096) {
 283                                 com_err (program_name, 0,
 284                                          "bad block size - %s", optarg);
 285                                 exit (1);
 286                         }
 287                         break;
 288                 case 'o':
 289                         output_file = optarg;
 290                         break;
 291                 case 's':
 292                         s_flag = 1;
 293                         break;
 294                 case 'v':
 295                         v_flag++;
 296                         break;
 297                 case 'w':
 298                         w_flag = 1;
 299                         break;
 300                 default:
 301                         usage ();
 302                 }
 303         }
 304         if (optind > argc - 1)
 305                 usage ();
 306         device_name = argv[optind++];
 307         if (optind > argc - 1)
 308                 usage ();
 309         blocks_count = strtoul (argv[optind], &tmp, 0);
 310         if (*tmp)
 311         {
 312                 com_err (program_name, 0, "bad blocks count - %s", argv[optind]);
 313                 exit (1);
 314         }
 315         if (++optind <= argc-1) {
 316                 from_count = strtoul (argv[optind], &tmp, 0);
 317         } else from_count = 0;
 318         if (from_count >= blocks_count) {
 319             com_err (program_name, 0, "bad blocks range: %lu-%lu",
 320                      from_count, blocks_count);
 321             exit (1);
 322         }
 323         dev = open (device_name, w_flag ? O_RDWR : O_RDONLY);
 324         if (dev == -1)
 325         {
 326                 com_err (program_name, errno,"while trying to open %s",
 327                          device_name);
 328                 exit (1);
 329         }
 330         if (output_file && strcmp (output_file, "-") != 0)
 331         {
 332                 out = fopen (output_file, "w");
 333                 if (out == NULL)
 334                 {
 335                         com_err (program_name, errno,"while trying to open %s",
 336                                  device_name);
 337                         exit (1);
 338                 }
 339         }
 340         else
 341                 out = stdout;
 342         if (w_flag)
 343                 test_rw (dev, blocks_count, block_size, out, from_count);
 344         else
 345                 test_ro (dev, blocks_count, block_size, out, from_count);
 346         close (dev);
 347         if (out != stdout)
 348                 fclose (out);
 349 }