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Re: [Qemu-devel] [RFC PATCH 0/4] block: file descriptor passing using -f

From: Eric Blake
Subject: Re: [Qemu-devel] [RFC PATCH 0/4] block: file descriptor passing using -filefd and getfd_file
Date: Tue, 22 May 2012 06:02:37 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1

On 05/22/2012 02:18 AM, Kevin Wolf wrote:

>> This patch series adds the -filefd command-line option and the
>> getfd_file monitor command.  This will enable libvirt to open a
>> file and push the corresponding filename and file descriptor to
>> QEMU.  When QEMU needs to "open" a file, it will first check if the
>> file descriptor was passed by either of these methods before
>> attempting to actually open the file.
> I thought we decided to avoid making some file names magic, and instead
> go for the obvious /dev/fd/42?

This doesn't make "some file names magic", it makes "all file names
magic".  In other words, _every_ call to open() first checks the
database for an existing fd for the same file name.

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

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