D61452.1794698194.diff
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	diff --git a/sbin/fsck/fsck.8 b/sbin/fsck/fsck.8
	--- a/sbin/fsck/fsck.8
	+++ b/sbin/fsck/fsck.8
	@@ -36,6 +36,7 @@
	.Sh SYNOPSIS
	.Nm
	.Op Fl Cdfnpvy
	+.Op Fl b Ar block
	.Op Fl B \| F
	.Op Fl T Ar fstype : Ns Ar fsoptions
	.Op Fl t Ar fstype
	@@ -123,6 +124,10 @@
	.Pp
	The options are as follows:
	.Bl -tag -width indent
	+.It Fl b Ar block
	+Use the block number
	+.Ar block
	+as the super block for the file system.
	.It Fl C
	Check if the
	.Dq clean
	diff --git a/sbin/fsck/fsck.c b/sbin/fsck/fsck.c
	--- a/sbin/fsck/fsck.c
	+++ b/sbin/fsck/fsck.c
	@@ -98,7 +98,7 @@
	struct fstab *fs;
	int i, rval = 0;
	const char *vfstype = NULL;
	- char globopt[3];
	+ char globopt[3], bopt[80];
	const char *etc_fstab;

	globopt[0] = '-';
	@@ -108,7 +108,7 @@
	TAILQ_INIT(&opthead);

	etc_fstab = NULL;
	- while ((i = getopt(argc, argv, "BCdvpfFnyl:t:T:c:")) != -1)
	+ while ((i = getopt(argc, argv, "BCdvpfFnyl:t:T:c:b:")) != -1)
	switch (i) {
	case 'B':
	if (flags & CHECK_BACKGRD)
	@@ -169,6 +169,11 @@
	etc_fstab = optarg;
	break;

	+ case 'b':
	+ snprintf(bopt, sizeof(bopt), "-b %s", optarg);
	+ catopt(&options, bopt);
	+ break;
	+
	case '?':
	default:
	usage();