debugfs: add the commands "zap_block" and "block_dump"

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
debian-1.42.9
Theodore Ts'o 2012-12-24 00:22:10 -05:00
parent e329f67ba5
commit ba75d9e208
3 changed files with 275 additions and 3 deletions

View File

@ -18,16 +18,17 @@ MK_CMDS= _SS_DIR_OVERRIDE=../lib/ss ../lib/ss/mk_cmds
DEBUG_OBJS= debug_cmds.o debugfs.o util.o ncheck.o icheck.o ls.o \
lsdel.o dump.o set_fields.o logdump.o htree.o unused.o e2freefrag.o \
filefrag.o extent_cmds.o extent_inode.o
filefrag.o extent_cmds.o extent_inode.o zap.o
RO_DEBUG_OBJS= ro_debug_cmds.o ro_debugfs.o util.o ncheck.o icheck.o ls.o \
lsdel.o logdump.o htree.o e2freefrag.o filefrag.o extent_inode.o
lsdel.o logdump.o htree.o e2freefrag.o filefrag.o extent_cmds.o \
extent_inode.o
SRCS= debug_cmds.c $(srcdir)/debugfs.c $(srcdir)/util.c $(srcdir)/ls.c \
$(srcdir)/ncheck.c $(srcdir)/icheck.c $(srcdir)/lsdel.c \
$(srcdir)/dump.c $(srcdir)/set_fields.c ${srcdir}/logdump.c \
$(srcdir)/htree.c $(srcdir)/unused.c ${srcdir}/../misc/e2freefrag.c \
$(srcdir)/filefrag.c $(srcdir)/extent_inode.c
$(srcdir)/filefrag.c $(srcdir)/extent_inode.c $(srcdir)/zap.c
LIBS= $(LIBEXT2FS) $(LIBE2P) $(LIBSS) $(LIBCOM_ERR) $(LIBBLKID) \
$(LIBUUID)

View File

@ -181,5 +181,11 @@ request do_set_mmp_value, "Set MMP value",
request do_extent_open, "Open inode for extent manipulation",
extent_open, eo;
request do_zap_block, "Zap block",
zap_block, zap;
request do_dump_block, "Zap block",
block_dump, bp;
end;

265
debugfs/zap.c Normal file
View File

@ -0,0 +1,265 @@
/*
* 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, char *argv[])
{
unsigned long pattern = 0;
unsigned char *buf;
ext2_ino_t inode;
errcode_t errcode;
blk64_t block;
int retval;
char *file = NULL;
char *in_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 >= 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 >= 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) > 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", 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", 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", block);
goto errout;
}
errout:
free(buf);
return;
}
void do_dump_block(int argc, char *argv[])
{
unsigned long pattern = 0;
unsigned char *buf;
ext2_ino_t inode;
errcode_t errcode;
blk64_t block;
int retval;
char *file = NULL;
char *in_file = NULL;
int c, err, i, j;
int suppress = -1;
if (check_fs_open(argv[0]))
return;
reset_getopt();
while ((c = getopt (argc, argv, "f:")) != EOF) {
switch (c) {
case 'f':
file = optarg;
break;
default:
goto print_usage;
}
}
if (argc != optind+1) {
print_usage:
com_err(0, 0, "Usage: dump_block [-f file] "
" 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", 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", block);
goto errout;
}
for (i=0; i < current_fs->blocksize; i += 16) {
if (suppress < 0) {
if (i && memcmp(buf + i, buf + i - 16, 16) == 0) {
suppress = i;
printf("*\n");
continue;
}
} else {
if (memcmp(buf + i, buf + suppress, 16) == 0)
continue;
suppress = -1;
}
printf("%04o ", i);
for (j = 0; j < 16; j++) {
printf("%02x", buf[i+j]);
if ((j % 2) == 1)
putchar(' ');
}
putchar(' ');
for (j = 0; j < 16; j++)
printf("%c", isprint(buf[i+j]) ? buf[i+j] : '.');
putchar('\n');
}
putchar('\n');
errout:
free(buf);
return;
}