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Re: [Qemu-devel] [PATCH v5 6/6] block: Enable qemu_open/close to work wi

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v5 6/6] block: Enable qemu_open/close to work with fd sets
Date: Wed, 25 Jul 2012 13:25:26 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0

On 07/25/2012 02:22 AM, Kevin Wolf wrote:
>>> Hm, not a nice interface where qemu_close() needs the filename and
>>> (worse) could be given a wrong filename. Maybe it would be better to
>>> maintain a list of fd -> fdset mappings in qemu_open/close?
>> I agree, I don't really like it either.
>> We already have a list of fd -> fdset mappings (mon_fdset_fd_t -> 
>> mon_fdset_t).  Would it be too costly to loop through all the fdsets/fds 
>> at the beginning of every qemu_close()?
> I don't think so. qemu_close() is not a fast path and happens almost
> never, and the list is short enough that searching it isn't a problem
> anyway.

I agree - just do the loop to do the reverse lookup yourself, rather
than making qemu_close() have a different signature than close().

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

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