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e2fsprogs
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e2fsprogs/misc/badblocks.c

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/*
* badblocks.c - Bad blocks checker
*
* Copyright (C) 1992, 1993, 1994 Remy Card <card@masi.ibp.fr>
* Laboratoire MASI, Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* Copyright 1995, 1996, 1997 by Theodore Ts'o
*
* This file is based on the minix file system programs fsck and mkfs
* written and copyrighted by Linus Torvalds <Linus.Torvalds@cs.helsinki.fi>
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
/*
* History:
* 93/05/26 - Creation from e2fsck
* 94/02/27 - Made a separate bad blocks checker
*/
#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#if HAVE_LINUX_FS_H
#include <linux/fd.h>
#include <linux/fs.h>
#endif
#include "et/com_err.h"
#include "ext2fs/io.h"
const char * program_name = "badblocks";
int v_flag = 0; /* verbose */
int w_flag = 0; /* do r/w test */
int s_flag = 0; /* show progress of test */
static volatile void usage (void)
{
fprintf (stderr, "Usage: %s [-b block_size] [-o output_file] [-svw] device blocks_count\n [start_count]\n",
program_name);
exit (1);
}
static unsigned long currently_testing = 0;
static unsigned long num_blocks = 0;
static void print_status(void)
{
fprintf(stderr, "%9ld/%9ld", currently_testing, num_blocks);
fprintf(stderr, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
fflush (stderr);
}
static void alarm_intr (int alnum)
{
signal (SIGALRM, alarm_intr);
alarm(1);
if (!num_blocks)
return;
fprintf(stderr, "%9ld/%9ld", currently_testing, num_blocks);
fprintf(stderr, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
fflush (stderr);
}
/*
* Perform a test of a block; return the number of blocks readable/writeable.
*/
static long do_test (int dev, char * buffer, int try, unsigned long block_size,
unsigned long current_block)
{
long got;
if (v_flag > 1)
print_status();
/* Seek to the correct loc. */
if (ext2fs_llseek (dev, (ext2_loff_t) current_block * block_size,
SEEK_SET) != (ext2_loff_t) current_block * block_size)
com_err (program_name, errno, "during seek");
/* Try the read */
got = read (dev, buffer, try * block_size);
if (got < 0)
got = 0;
if (got & (block_size - 1))
fprintf (stderr,
"Weird value (%ld) in do_test: probably bugs\n",
got);
got /= block_size;
return got;
}
static void flush_bufs (int dev, int sync)
{
if (v_flag
#if !defined (BLKFLSBUF) && !defined (FDFLUSH)
&& sync
#endif
)
fprintf (stderr, "Flushing buffers\n");
if (sync && fsync (dev) == -1)
com_err (program_name, errno, "during fsync");
#ifdef BLKLSBUF
ioctl (dev, BLKFLSBUF, 0); /* In case this is a HD */
#endif
#ifdef FDFLUSH
ioctl (dev, FDFLUSH, 0); /* In case this is floppy */
#endif
}
static void test_ro (int dev, unsigned long blocks_count,
unsigned long block_size, FILE * out,
unsigned long from_count)
{
#define TEST_BUFFER_BLOCKS 16
char * blkbuf;
int try;
long got;
blkbuf = malloc (TEST_BUFFER_BLOCKS * block_size);
if (!blkbuf)
{
com_err (program_name, ENOMEM, "while allocating buffers");
exit (1);
}
flush_bufs (dev, 0);
if (v_flag) {
fprintf (stderr,
"Checking for bad blocks in read-only mode\n");
fprintf (stderr, "From block %lu to %lu\n", from_count, blocks_count);
}
try = TEST_BUFFER_BLOCKS;
currently_testing = from_count;
num_blocks = blocks_count;
if (s_flag || v_flag > 1) {
fprintf(stderr, "Checking for bad blocks (read-only test): ");
if (v_flag <= 1)
alarm_intr(SIGALRM);
}
while (currently_testing < blocks_count)
{
if (currently_testing + try > blocks_count)
try = blocks_count - currently_testing;
got = do_test (dev, blkbuf, try, block_size, currently_testing);
currently_testing += got;
if (got == try) {
try = TEST_BUFFER_BLOCKS;
continue;
}
else
try = 1;
if (got == 0)
fprintf (out, "%lu\n", currently_testing++);
}
num_blocks = 0;
alarm(0);
if (s_flag || v_flag > 1)
fprintf(stderr, "done \n");
fflush (stderr);
free (blkbuf);
}
static void test_rw (int dev, unsigned long blocks_count,
unsigned long block_size, FILE * out,
unsigned long from_count)
{
int i;
char * buffer;
unsigned char pattern[] = {0xaa, 0x55, 0xff, 0x00};
buffer = malloc (2 * block_size);
if (!buffer)
{
com_err (program_name, ENOMEM, "while allocating buffers");
exit (1);
}
flush_bufs (dev, 0);
if (v_flag) {
fprintf(stderr,
"Checking for bad blocks in read-write mode\n");
fprintf(stderr, "From block %lu to %lu\n",
from_count, blocks_count);
}
for (i = 0; i < sizeof (pattern); i++) {
memset (buffer, pattern[i], block_size);
if (s_flag | v_flag)
fprintf (stderr, "Writing pattern 0x%08x: ",
*((int *) buffer));
num_blocks = blocks_count;
currently_testing = from_count;
if (s_flag && v_flag <= 1)
alarm_intr(SIGALRM);
for (;
currently_testing < blocks_count;
currently_testing++)
{
if (ext2fs_llseek (dev, (ext2_loff_t) currently_testing *
block_size, SEEK_SET) !=
(ext2_loff_t) currently_testing * block_size)
com_err (program_name, errno,
"during seek on block %d",
currently_testing);
if (v_flag > 1)
print_status();
write (dev, buffer, block_size);
}
num_blocks = 0;
alarm (0);
if (s_flag | v_flag)
fprintf(stderr, "done \n");
flush_bufs (dev, 1);
if (s_flag | v_flag)
fprintf (stderr, "Reading and comparing: ");
num_blocks = blocks_count;
currently_testing = from_count;
if (s_flag && v_flag <= 1)
alarm_intr(SIGALRM);
for (;
currently_testing < blocks_count;
currently_testing++)
{
if (ext2fs_llseek (dev, (ext2_loff_t) currently_testing *
block_size, SEEK_SET) !=
(ext2_loff_t) currently_testing * block_size)
com_err (program_name, errno,
"during seek on block %d",
currently_testing);
if (v_flag > 1)
print_status();
if (read (dev, buffer + block_size, block_size) < block_size)
fprintf (out, "%ld\n", currently_testing);
else if (memcmp (buffer, buffer + block_size, block_size))
fprintf (out, "%ld\n", currently_testing);
}
num_blocks = 0;
alarm (0);
if (s_flag | v_flag)
fprintf(stderr, "done \n");
flush_bufs (dev, 0);
}
}
void main (int argc, char ** argv)
{
char c;
char * tmp;
char * device_name;
char * output_file = NULL;
FILE * out;
unsigned long block_size = 1024;
unsigned long blocks_count, from_count;
int dev;
setbuf(stdout, NULL);
setbuf(stderr, NULL);
if (argc && *argv)
program_name = *argv;
while ((c = getopt (argc, argv, "b:o:svw")) != EOF) {
switch (c) {
case 'b':
block_size = strtoul (optarg, &tmp, 0);
if (*tmp || block_size > 4096) {
com_err (program_name, 0,
"bad block size - %s", optarg);
exit (1);
}
break;
case 'o':
output_file = optarg;
break;
case 's':
s_flag = 1;
break;
case 'v':
v_flag++;
break;
case 'w':
w_flag = 1;
break;
default:
usage ();
}
}
if (optind > argc - 1)
usage ();
device_name = argv[optind++];
if (optind > argc - 1)
usage ();
blocks_count = strtoul (argv[optind], &tmp, 0);
if (*tmp)
{
com_err (program_name, 0, "bad blocks count - %s", argv[optind]);
exit (1);
}
if (++optind <= argc-1) {
from_count = strtoul (argv[optind], &tmp, 0);
} else from_count = 0;
if (from_count >= blocks_count) {
com_err (program_name, 0, "bad blocks range: %lu-%lu",
from_count, blocks_count);
exit (1);
}
dev = open (device_name, w_flag ? O_RDWR : O_RDONLY);
if (dev == -1)
{
com_err (program_name, errno,"while trying to open %s",
device_name);
exit (1);
}
if (output_file && strcmp (output_file, "-") != 0)
{
out = fopen (output_file, "w");
if (out == NULL)
{
com_err (program_name, errno,"while trying to open %s",
device_name);
exit (1);
}
}
else
out = stdout;
if (w_flag)
test_rw (dev, blocks_count, block_size, out, from_count);
else
test_ro (dev, blocks_count, block_size, out, from_count);
close (dev);
if (out != stdout)
fclose (out);
}
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