Date: Tue, 2 May 2000 20:53:31 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: "David O'Brien" <obrien@FreeBSD.ORG> Cc: alpha@FreeBSD.ORG, bde@FreeBSD.ORG Subject: Re: (FWD) `dd' patch pertaining to Alpha Message-ID: <Pine.BSF.4.05.10005022052580.11416-100000@semuta.feral.com> In-Reply-To: <20000502204027.A94062@dragon.nuxi.com>
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Well, the right thing to do is to fix the label code. Bruce whacked me the
last time on this, so I'll recuse myself from beinginvolved.
On Tue, 2 May 2000, David O'Brien wrote:
> I sent Matt's patch to Brian (maintainer for `dd') and he reworked it
> into this. Can people comment if this fixes their `dd' problems, etc..
>
> ----- Forwarded message from Brian Fundakowski Feldman <green@FreeBSD.org> -----
> --- dd.c 1999/10/03 18:49:51 1.27
> +++ dd.c 2000/05/02 05:13:21
> @@ -54,2 +54,3 @@
> #include <sys/conf.h>
> +#include <sys/disklabel.h>
> #include <sys/filio.h>
> @@ -220,4 +221,10 @@
> io->flags |= ISTAPE;
> - else if (type & (D_DISK | D_MEM))
> + else if (type & (D_DISK | D_MEM)) {
> + if (type & D_DISK) {
> + const int one = 1;
> +
> + (void)ioctl(io->fd, DIOCWLABEL, &one);
> + }
> io->flags |= ISSEEK;
> + }
> if (S_ISCHR(sb.st_mode) && (type & D_TAPE) == 0)
>
> If the disk supports DIOCWLABEL or not, we have no way of knowing, so it
> makes no sense to check the error return. The error return may be EBADF
> for trying to set DIOCWLABEL on a non-FWRITE file descriptor, or it may
> be ENODEV for a device which doesn't support it, or it could be a valid
> error. In any case, DIOCWLABEL will make it not fail for da(4) devices,
> and the error return DIOCWLABEL won't matter in the end.
>
> How does that work for you? I don't have da(4) disks...
>
> Now to try to figure out what the difference between EPERM and EACCES is...
> These things are so annoying.
>
> --
> Brian Fundakowski Feldman \ FreeBSD: The Power to Serve! /
> green@FreeBSD.org `------------------------------'
>
> ----- End forwarded message -----
>
>
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