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/*
* zap.c --- zap block
*
* Copyright (C) 2012 Theodore Ts'o. This file may be redistributed
* under the terms of the GNU Public License.
*/
#include "config.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <sys/types.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#else
extern int optind;
extern char *optarg;
#endif
#include "debugfs.h"
void do_zap_block(int argc, ss_argv_t argv, int sci_idx EXT2FS_ATTR((unused)),
void *infop EXT2FS_ATTR((unused)))
{
unsigned long pattern = 0;
unsigned char *buf;
ext2_ino_t inode;
errcode_t errcode;
blk64_t block;
char *file = NULL;
int c, err;
int offset = -1;
int length = -1;
int bit = -1;
if (check_fs_open(argv[0]))
return;
if (check_fs_read_write(argv[0]))
return;
reset_getopt();
while ((c = getopt (argc, argv, "b:f:l:o:p:")) != EOF) {
switch (c) {
case 'f':
file = optarg;
break;
case 'b':
bit = parse_ulong(optarg, argv[0],
"bit", &err);
if (err)
return;
if (bit >= (int) current_fs->blocksize * 8) {
com_err(argv[0], 0, "The bit to flip "
"must be within a %d block\n",
current_fs->blocksize);
return;
}
break;
case 'p':
pattern = parse_ulong(optarg, argv[0],
"pattern", &err);
if (err)
return;
if (pattern >= 256) {
com_err(argv[0], 0, "The fill pattern must "
"be an 8-bit value\n");
return;
}
break;
case 'o':
offset = parse_ulong(optarg, argv[0],
"offset", &err);
if (err)
return;
if (offset >= (int) current_fs->blocksize) {
com_err(argv[0], 0, "The offset must be "
"within a %d block\n",
current_fs->blocksize);
return;
}
break;
break;
case 'l':
length = parse_ulong(optarg, argv[0],
"length", &err);
if (err)
return;
break;
default:
goto print_usage;
}
}
if (bit > 0 && offset > 0) {
com_err(argv[0], 0, "The -o and -b options can not be mixed.");
return;
}
if (offset < 0)
offset = 0;
if (length < 0)
length = current_fs->blocksize - offset;
if ((offset + length) > (int) current_fs->blocksize) {
com_err(argv[0], 0, "The specified length is too bug\n");
return;
}
if (argc != optind+1) {
print_usage:
com_err(0, 0, "Usage:\tzap_block [-f file] [-o offset] "
"[-l length] [-p pattern] block_num");
com_err(0, 0, "\tzap_block [-f file] [-b bit] "
"block_num");
return;
}
block = parse_ulonglong(argv[optind], argv[0], "block", &err);
if (err)
return;
if (file) {
inode = string_to_inode(file);
if (!inode)
return;
errcode = ext2fs_bmap2(current_fs, inode, 0, 0, 0,
block, 0, &block);
if (errcode) {
com_err(argv[0], errcode,
"while mapping logical block %llu\n",
(unsigned long long) block);
return;
}
}
buf = malloc(current_fs->blocksize);
if (!buf) {
com_err(argv[0], 0, "Couldn't allocate block buffer");
return;
}
errcode = io_channel_read_blk64(current_fs->io, block, 1, buf);
if (errcode) {
com_err(argv[0], errcode,
"while reading block %llu\n",
(unsigned long long) block);
goto errout;
}
if (bit >= 0)
buf[bit >> 3] ^= 1 << (bit & 7);
else
memset(buf+offset, pattern, length);
errcode = io_channel_write_blk64(current_fs->io, block, 1, buf);
if (errcode) {
com_err(argv[0], errcode,
"while write block %llu\n",
(unsigned long long) block);
goto errout;
}
errout:
free(buf);
return;
}
void do_block_dump(int argc, ss_argv_t argv, int sci_idx EXT2FS_ATTR((unused)),
void *infop EXT2FS_ATTR((unused)))
{
unsigned char *buf;
ext2_ino_t inode;
errcode_t errcode;
blk64_t block;
char *file = NULL;
int xattr_dump = 0;
int c, err;
if (check_fs_open(argv[0]))
return;
reset_getopt();
while ((c = getopt (argc, argv, "f:x")) != EOF) {
switch (c) {
case 'f':
file = optarg;
break;
case 'x':
xattr_dump = 1;
break;
default:
goto print_usage;
}
}
if (argc != optind + 1) {
print_usage:
com_err(0, 0, "Usage: block_dump [-x] [-f inode] block_num");
return;
}
block = parse_ulonglong(argv[optind], argv[0], "block", &err);
if (err)
return;
if (file) {
inode = string_to_inode(file);
if (!inode)
return;
errcode = ext2fs_bmap2(current_fs, inode, 0, 0, 0,
block, 0, &block);
if (errcode) {
com_err(argv[0], errcode,
"while mapping logical block %llu\n",
(unsigned long long) block);
return;
}
}
buf = malloc(current_fs->blocksize);
if (!buf) {
com_err(argv[0], 0, "Couldn't allocate block buffer");
return;
}
errcode = io_channel_read_blk64(current_fs->io, block, 1, buf);
if (errcode) {
com_err(argv[0], errcode,
"while reading block %llu\n",
(unsigned long long) block);
goto errout;
}
if (xattr_dump)
block_xattr_dump(stdout, buf, current_fs->blocksize);
else
do_byte_hexdump(stdout, buf, current_fs->blocksize);
errout:
free(buf);
}
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