Date: Wed, 15 Jan 2020 10:42:52 +0100 From: Willem Jan Withagen <wjw@digiware.nl> To: Paul Vixie <paul@redbarn.org>, "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: Adding a different type of blockstore to Bhyve Message-ID: <a23cd9c5-82d9-3aa4-f5d8-397de31c1aa7@digiware.nl> In-Reply-To: <42643725.2GhSzOL8V3@linux-9daj> References: <6e5508d0-4a41-8442-3807-8b9e22bba933@digiware.nl> <42643725.2GhSzOL8V3@linux-9daj>
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On 31-12-2019 00:48, Paul Vixie wrote:
> On Monday, 30 December 2019 18:06:11 UTC Willem Jan Withagen wrote:
>> Something like:
>> bhyve -s 1,virtio-blk,rbd:poolname/imagename[@snapshotname] \
>> [:option1=value1[:option2=value2...]]
>
> this is approximately how i'd hope to do object-store level ZFS integration,
> so as to avoid the zvol abstraction. i know you're working on Ceph not ZFS but
> the concepts and facilities are similar enough to warrant cooperative
> thinking.
>
>> So the questions are:
>> 1) Is the abstraction of block_backends.{ch} the way to go?
>> 1.1) And would the extra indirection there be acceptable?
>> (For network devices it seems no problem)
>>
>> 2) Does anybody already have such a framework for blockdevs?
>> (Otherwise I'll try to morph the net_backends.{ch}
>>
>> 3) Other suggestions I need to consider?
>
> i think you're hitting an architectural limit, and that the bhyve design team
> should be thinking about a third way, one which would also solve my own
> loopback and mmap requirements as i've described variously. what you want to
> do should not only be possible, it should be clean and performant.
Hi Paul,
Thanx for the encouraging words....
I've missed the discussion on loopback and mmap, I just don't have the
time to read all FreeBSD and other groups. So once in a while I just do
major catch up by delete. ;-)
In the mean time I have submitted:
https://reviews.freebsd.org/D23010
To give block_if a generic interface.
Feel free to comment on it, and suggest changes that will help you with
what you are looking at.
--WjW
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