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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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- [Qemu-devel] [RFC PATCH 4/4] Example -filefd and getfd_file server, (continued)
- [Qemu-devel] [RFC PATCH 4/4] Example -filefd and getfd_file server, Corey Bryant, 2012/05/21
- [Qemu-devel] [RFC PATCH 3/4] block: Enable QEMU to retrieve passed fd before attempting open, Corey Bryant, 2012/05/21
- [Qemu-devel] [RFC PATCH 2/4] qmp/hmp: Add getfd_file monitor command, Corey Bryant, 2012/05/21
- Re: [Qemu-devel] [RFC PATCH 0/4] block: file descriptor passing using -filefd and getfd_file, Kevin Wolf, 2012/05/22
- Re: [Qemu-devel] [RFC PATCH 0/4] block: file descriptor passing using -filefd and getfd_file, Eric Blake, 2012/05/22
- Re: [Qemu-devel] [RFC PATCH 0/4] block: file descriptor passing using -filefd and getfd_file, Corey Bryant, 2012/05/22