Re: [Qemu-devel] [PATCH V9 01/14] block: move bdrv_snapshot_find() to block/snapshot.c

[Kevin Wolf <kwolf@redhat.com>]

Am 15.03.2013 um 07:23 hat Wenchao Xia geschrieben:
> 于 2013-3-14 20:53, Kevin Wolf 写道:
> >Am 14.03.2013 um 13:10 hat Markus Armbruster geschrieben:
> >>Kevin Wolf <kwolf@redhat.com> writes:
> >>>But you have to do it right. This specific patch would introduce a
> >>>copyright violation. It's really not that hard to conform to the terms
> >>>of the MIT license, but that doesn't mean that you can ignore it. There
> >>>is exactly one requirement and it reads like this:
> >>>
> >>>   The above copyright notice and this permission notice shall be
> >>>   included in all copies or substantial portions of the Software.
> >>
> >>That's why I pointed to resources and examples on how to do it properly.
> >>
> >>>(I'm still waiting for a patch to blockdev.c, for which you did it
> >>>wrong, by the way)
> >>
> >>Oops, that one fell through the cracks.  Patch coming.
> >
> >Thanks.
> >
> >>>>Of course, the stronger license still has to be compatible with GPLv2,
> >>>>so we can accept the result into QEMU.
> >>>>
> >>>>If a subsystem has additional requirements on licenses, its maintainers
> >>>>will explain them to you.  For what it's worth, substantial parts of the
> >>>>block layer are already GPLv2+.
> >>>
> >>>What parts exactly? As long as there are plans for a libqblock and as
> >>>long as it doesn't seem completely impossible to have it under LGPL, I
> >>>will ask to use either MIT or LGPL for block layer code (this doesn't
> >>>apply to qemu-only code that isn't used in the tools - in this sense,
> >>>things like blockdev.c are not part of the block layer)
> >>
> >>$ git-grep -lw GPL block block*
> >>block-migration.c
> >>block/blkverify.c
> >>block/gluster.c
> >>block/linux-aio.c
> >>block/raw-aio.h
> >>block/rbd.c
> >>block/sheepdog.c
> >>blockdev-nbd.c
> >>blockdev.c
> >
> >Luckily, none of these are really critical for a libqblock library, even
> >though they would be nice to have.
> >
> >If we can't license such a library as LGPL, we would lose the most
> >important potential user, which is libvirt. In which case I probably
> >wouldn't want to bother with providing a library at all.
> >
> >Kevin
> >
>   As the discuss, I feel a direct copy of the license is the
> easiest way, the original one is a good enough MIT license, if
> my understanding is correct.
>   One more question: should the date be changed to 2003-2013 in
> new file?
> 
> /*
>  * QEMU System Emulator
>  *
>  * Copyright (c) 2003-2008 Fabrice Bellard
> .....

Probably not that important, but I would leave it as it is.

Kevin