On Tue, Aug 02, 2016 at 07:55:03PM +0200, Stanislav Brabec wrote:
> Here is a patch set that is based on a "safe implementation of loop
> reuse" patch set sent three weeks ago.
>
> It addresses the same loop device issues in losetup.
>
> Issues not addressed:
> Calling losetup twice still fails (and it is probably correct):
> losetup /dev/loop0 loop.img
> losetup /dev/loop0 loop.img
>
> "[PATCH 6/8] losetup: Prevent rare detach race" needs a careful review,
> as I don't have a test case for it. It is even possible to skip it. It
> addresses a theoretical race problem:
>
> LOOPDEV=$(losetup -f --show loop.img)
> losetup -d $LOOPDEV
> sleep {a very special amount of time}
> losetup -f --show loop.img
I have merged this feature, but it's not enabled by default. You have
to use --nooverlap
losetup --find --nooverlap file.img
or
losetup --nooverlap /dev/loopN file.img
The man page has been also updated to make it more obvious for users
that --nooverlap is a good idea.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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