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Re: [Qemu-devel] [patch 2/5] qemu-nbd: merge NBD client/server
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [patch 2/5] qemu-nbd: merge NBD client/server |
Date: |
Thu, 03 Jul 2008 09:21:10 +0200 |
User-agent: |
Thunderbird 2.0.0.12 (X11/20071114) |
Thiemo Seufer schrieb:
> address@hidden wrote:
>> This patch allows to connect directly a disk image file to an NBD
>> device. It introduces the use of a unix socket (instead of inet).
>>
>> - To connect a file to a device:
>>
>> # qemu-nbd --connect=/dev/nbd0 my_disk.qcow2
>>
>> Then you can see directly your disk (no need of nbd-client):
>>
>> # fdisk -l /dev/nbd0
>>
>> Disk /dev/nbd0: 4294 MB, 4294967296 bytes
>> 255 heads, 63 sectors/track, 522 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>
>> Device Boot Start End Blocks Id System
>> /dev/nbd0p1 * 1 492 3951958+ 83 Linux
>> /dev/nbd0p2 493 522 240975 5 Extended
>> /dev/nbd0p5 493 522 240943+ 82 Linux swap /
>> Solaris
>>
>> - To disconnect the file from the device:
>>
>> # qemu-nbd --disconnect /dev/nbd0
>>
>> Changelog:
>> - v2: call show_parts() from client and avoid the sleep(1). Thank you to
>> Avi and Anthony. Include my cleanup patch and comments from Carlo
>> Marcelo Arenas Belon.
>> - v3: allow to specify unix socket name with "--socket" and update
>> documentation.
>
> There's still a call to sleep() in this patch.
And that's fine, IMHO. sleep() is not bad per se. The remaining call is
not a "guess it'll take at most a second" style sleep but waiting in a
loop until the child is ready. You don't want the loop to eat up 100%
CPU, do you?
Kevin