Date: Mon, 6 Dec 1999 10:00:51 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Matthew Jacob <mjacob@feral.com> Cc: "David O'Brien" <obrien@FreeBSD.ORG>, Bruce Evans <bde@zeta.org.au>, current@FreeBSD.ORG Subject: Re: oh, btw... Message-ID: <199912061800.KAA70858@apollo.backplane.com> References: <Pine.BSF.4.05.9912051518100.2157-100000@semuta.feral.com>
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:> How do we fix this problem? I keeps from from
:> ``dd if=/dev/da1 of=/dev/da2'' ?? I was very peeved at having to put the
:> disks on a Solaris box to do such a normal Unix task.
:
:
:this will fix your dd
:
:Index: dd.c
:===================================================================
:RCS file: /home/ncvs/src/bin/dd/dd.c,v
:retrieving revision 1.27
:diff -u -r1.27 dd.c
:--- dd.c 1999/10/03 18:49:51 1.27
:+++ dd.c 1999/12/05 23:17:16
:@@ -216,6 +216,16 @@
: if (ioctl(io->fd, FIODTYPE, &type) == -1) {
: err(1, "%s", io->name);
: } else {
:+if (type & D_DISK) {
:+static int one = 1;
:+#ifndef DIOCWLABEL
:+#define DIOCWLABEL _IOW('d', 109, int)
:+#endif
:+fprintf(stderr, "is a disk\n");
:+if (ioctl(io->fd, DIOCWLABEL, &one) < 0) {
:+perror("DIOCWLABEL");
:+}
:+}
: if (type & D_TAPE)
: io->flags |= ISTAPE;
: else if (type & (D_DISK | D_MEM))
:
Woa, timeout!
dd if=/dev/da1 of=/dev/da2 had better work - the label area should not
be in any way write protected when you use the non-partition device.
If you were to use /dev/da2c, *then* it would be reasonable to
write-protect the label area. But if you use /dev/da2 it is not.
We should not go around hacking dd when the problem is in the kernel.
-Matt
Matthew Dillon
<dillon@backplane.com>
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