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o Add an option allowing to start search from some offset instead of offset 0;

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o mesure distance between UFS1 and UFS2 superblocks independently.

MFC after:	1 week
This commit is contained in:
Maxim Sobolev 2006-05-13 20:23:06 +00:00
parent 8f8790a76d
commit 684e75f7c3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=158526
1 changed files with 46 additions and 13 deletions
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59
tools/tools/find-sb/find-sb.c
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@ -30,20 +30,49 @@ static union {
int
main(int argc, char **argv)
{
off_t end, last;
off_t end, last1, last2;
size_t len;
ssize_t justread;
int fd;
char *ch;
char c;
intmax_t offset;
if (argv[1] == NULL)
while ((c = getopt(argc, argv, "o:")) != -1) {
switch (c) {
case 'o':
if (optarg[0] == '\0')
errx(1, "usage");
offset = strtoimax(optarg, &ch, 10);
if (*ch != '\0' || offset < 0)
errx(1, "usage");
offset -= offset % DEV_BSIZE;
break;
default:
errx(1, "usage");
}
}
argc -= optind;
argv += optind;
if (argc != 1)
errx(1, "usage");
fd = open(argv[1], O_RDONLY, 0);
fd = open(argv[0], O_RDONLY, 0);
if (fd < 0)
err(1, "%s", argv[1]);
err(1, "%s", argv[0]);
if (offset != 0) {
end = lseek(fd, offset, SEEK_SET);
if (end == -1)
err(1, "%s", argv[0]);
} else {
end = 0;
}
len = 0;
last1 = last2 = -1;
end = len = 0;
last = -1;
while (1) {
justread = read(fd, &u.buf[len], DEV_BSIZE);
if (justread != DEV_BSIZE) {
@ -60,7 +89,7 @@ main(int argc, char **argv)
len += DEV_BSIZE;
end += DEV_BSIZE;
if (len >= sizeof(struct fs)) {
intmax_t offset = end - len;
offset = end - len;
if (u.sblock.fs_magic == FS_UFS1_MAGIC) {
intmax_t fsbegin = offset - SBLOCK_UFS1;
@ -70,11 +99,13 @@ main(int argc, char **argv)
printf("Filesystem might begin at offset %jd, "
"block %jd\n", fsbegin,
fsbegin / DEV_BSIZE);
if (last >= 0) {
if (last1 >= 0) {
printf("%jd blocks from last guess\n",
fsbegin / DEV_BSIZE - last);
fsbegin / DEV_BSIZE - last1);
}
last = fsbegin / DEV_BSIZE;
last1 = fsbegin / DEV_BSIZE;
len -= DEV_BSIZE;
memmove(u.buf, &u.buf[DEV_BSIZE], len);
} else if (u.sblock.fs_magic == FS_UFS2_MAGIC) {
intmax_t fsbegin = offset - SBLOCK_UFS2;
printf("Found UFS2 superblock at offset %jd, "
@ -83,11 +114,13 @@ main(int argc, char **argv)
printf("Filesystem might begin at offset %jd, "
"block %jd\n", fsbegin,
fsbegin / DEV_BSIZE);
if (last >= 0) {
if (last2 >= 0) {
printf("%jd blocks from last guess\n",
fsbegin / DEV_BSIZE - last);
fsbegin / DEV_BSIZE - last2);
}
last = fsbegin / DEV_BSIZE;
last2 = fsbegin / DEV_BSIZE;
len -= DEV_BSIZE;
memmove(u.buf, &u.buf[DEV_BSIZE], len);
}
}
if (len >= SBLOCKSIZE) {