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Re: [Qemu-devel] [PATCH] block/raw-posix: detect readonly LVM volumes us
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] [PATCH] block/raw-posix: detect readonly LVM volumes using BLKROGET |
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Date: |
Tue, 5 Feb 2013 12:21:00 +0100 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Feb 04, 2013 at 03:49:10PM +0100, Markus Armbruster wrote:
> Stefan Hajnoczi <address@hidden> writes:
>
> > LVM volumes can be set read-only with "lvchange --permission r
> > <volume>". The device node permissions remain unchanged so the volume
> > can still be opened O_RDWR. Actual writes will fail.
>
> Are you sure it's just LVM? blockdev(8) suggests it's a more general
> issue. Check out --setro there.
You are right. I tested "blockdev --setro" and got the same behavior.
I'll resend with comments indicating Linux block devices in general,
instead of just LVM.
Stefan