Re: [Qemu-devel] [PATCH v10 1/2] block/vxhs.c: Add support for a new block device type called "vxhs"

[Eric Blake <eblake@redhat.com>]

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On 03/26/2017 09:50 PM, Ashish Mittal wrote:
> Source code for the qnio library that this code loads can be downloaded from:
> https://github.com/VeritasHyperScale/libqnio.git

When sending a multi-patch series, please include a 0/2 cover letter
('git config format.coverletter auto' can help).

> 
> Sample command line using JSON syntax:
> ./x86_64-softmmu/qemu-system-x86_64 -name instance-00000008 -S -vnc 0.0.0.0:0
> -k en-us -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
> -msg timestamp=on
> 'json:{"driver":"vxhs","vdisk-id":"c3e9095a-a5ee-4dce-afeb-2a59fb387410",
> "server":{"host":"172.172.17.4","port":"9999"}}'
> 
> Sample command line using URI syntax:
> qemu-img convert -f raw -O raw -n
> /var/lib/nova/instances/_base/0c5eacd5ebea5ed914b6a3e7b18f1ce734c386ad
> vxhs://192.168.0.1:9999/c6718f6b-0401-441d-a8c3-1f0064d75ee0

Do we really need URI syntax, now that we have -blockdev-add going into 2.9?

> 
> Sample command line using TLS credentials (run in secure mode):
> ./qemu-io --object
> tls-creds-x509,id=tls0,dir=/etc/pki/qemu/vxhs,endpoint=client -c 'read
> -v 66000 2.5k' 'json:{"server.host": "127.0.0.1", "server.port": "9999",
> "vdisk-id": "/test.raw", "driver": "vxhs", "tls-creds":"tls0"}'
> 
> Signed-off-by: Ashish Mittal <Ashish.Mittal@veritas.com>
> ---
> 

I'm just doing a high-level review of the interface, and leaving the
actual code review to others.

> +++ b/block/vxhs.c
> @@ -0,0 +1,595 @@
> +/*
> + * QEMU Block driver for Veritas HyperScale (VxHS)
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + *

No Copyright notice?  The GPL works by virtue of copyright law, so
generally a copyright holder should be mentioned.


> +++ b/qapi/block-core.json
> @@ -2118,6 +2118,7 @@
>  # @iscsi: Since 2.9
>  # @rbd: Since 2.9
>  # @sheepdog: Since 2.9
> +# @vxhs: Since 2.10
>  #
>  # Since: 2.0
>  ##
> @@ -2127,7 +2128,7 @@
>              'host_device', 'http', 'https', 'iscsi', 'luks', 'nbd', 'nfs',
>              'null-aio', 'null-co', 'parallels', 'qcow', 'qcow2', 'qed',
>              'quorum', 'raw', 'rbd', 'replication', 'sheepdog', 'ssh',
> -            'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat' ] }
> +            'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat', 'vxhs' ] }

Markus has patches pending (to promote x-blockdev-del over to
blockdev-del) that will conflict in context with this patch.  You may
have to rebase again, but hopefully the conflicts should be easy to
figure out.

>  
>  ##
>  # @BlockdevOptionsFile:
> @@ -2820,6 +2821,22 @@
>    'data': { '*offset': 'int', '*size': 'int' } }
>  
>  ##
> +# @BlockdevOptionsVxHS:
> +#
> +# Driver specific block device options for VxHS
> +#
> +# @vdisk-id:    UUID of VxHS volume
> +# @server:      vxhs server IP, port
> +# @tls-creds:   TLS credentials ID
> +#
> +# Since: 2.10
> +##
> +{ 'struct': 'BlockdevOptionsVxHS',
> +  'data': { 'vdisk-id': 'str',
> +            'server': 'InetSocketAddress',

Do you want to use the new InetSocketAddressBase (just host and port,
eliminating things like 'to' that don't make much sense in this context)?

> +            '*tls-creds': 'str' } }
> +
> +##
>  # @BlockdevOptions:
>  #
>  # Options for creating a block device.  Many options are available for all
> @@ -2881,7 +2898,8 @@
>        'vhdx':       'BlockdevOptionsGenericFormat',
>        'vmdk':       'BlockdevOptionsGenericCOWFormat',
>        'vpc':        'BlockdevOptionsGenericFormat',
> -      'vvfat':      'BlockdevOptionsVVFAT'
> +      'vvfat':      'BlockdevOptionsVVFAT',
> +      'vxhs':       'BlockdevOptionsVxHS'
>    } }
>  
>  ##
> 

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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