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Re: [Qemu-block] [Qemu-devel] [PATCH] nbd/server: Honor FUA request on N

From: Eric Blake
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH] nbd/server: Honor FUA request on NBD_CMD_TRIM
Date: Mon, 12 Mar 2018 17:30:40 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 03/07/2018 04:57 PM, Eric Blake wrote:
The NBD spec states that since trim requests can affect disk contents,
then they should allow for FUA semantics just like writes for ensuring
the disk has settled before returning.  As bdrv_[co_]pdiscard() does
not (yet?) support a flags argument, we can't pass FUA down the block
layer stack, and must therefore emulate it with a flush at the NBD

Signed-off-by: Eric Blake <address@hidden>

Thanks; queued to my NBD tree.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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