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Re: [Qemu-devel] [RFC PATCH 2/4] qmp/hmp: Add getfd_file monitor command

From: Eric Blake
Subject: Re: [Qemu-devel] [RFC PATCH 2/4] qmp/hmp: Add getfd_file monitor command
Date: Mon, 21 May 2012 15:48:15 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1

On 05/21/2012 02:19 PM, Corey Bryant wrote:
> This patch provides support for the getfd_file monitor command.
> This command will allow passing of a filename and its corresponding
> file descriptor to a guest via the monitor.  This command could be
> followed, for example, by a drive_add command to hot attach a disk
> drive.
> Signed-off-by: Corey Bryant <address@hidden>

Is the only difference between 'getfd' and 'getfd_file' the fact that
'getfd' introduces an abstract namespace usable only by the fd:
protocol, while the 'getfd_file' introduces a name identical to the
absolute naming of the file system and usable by the file: protocol?
What happens if I pass 'getfd_file' a relative file name?  Must the
filename passed to 'getfd_file' be in canonical form, or may it contain
symlinks, .., and other non-canonical constructs?

Can the 'closefd' command be used to close the fd originally given to
qemu via 'getfd_file'?

Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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