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Date: Wed, 25 Oct 2017 21:31:15 +0800
From: Fam Zheng <famz@redhat.com>
Message-ID: <20171025133115.GA23458@lemon>
References: <BC29A004BA570342A4CC0044A3845572CFCE5592@H3CMLB12-EX.srv.huawei-3com.com>
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Subject: Re: [Qemu-devel] Block format 'raw' does not support the option
 'locking' when disable image locking with option locking=off
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To: Changlimin <changlimin@h3c.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Wed, 10/25 08:15, Changlimin wrote:
> Hi,
> When running Oracle RAC, one image is shared between multiple vms, so I want to disable locking with option locking=off, But Block format 'raw' does not support the option 'locking'.
> How to disable locking?
> 
> The version is git e822e81e350825dd94f41ee2538ff1432b812eb9
> 
> The command line is
> -drive file=/var/lib/libvirt/images/r0605-share.img,format=raw,if=none,id=drive-virtio-disk1,cache=directsync,aio=native,locking=off \
> -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0xa,drive=drive-virtio-disk1,id=virtio-disk1 \

Hi, in this case you probably want to use share-rw=on:

 -device virtio-blk-pci,share-rw=on,scsi=off,...

The -drive option is the same. This is more semantically correct than
locking=off as it means "the device can share the image with other QEMUs".

But for really disabling locking with "locking=off", the right syntax is:

 -drive file.filename=/var/lib/...,file.locking=off \

or alternatively:

 -drive driver=file,filename=/var/lib/...,locking=off \

Fam