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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [PATCH v4 2/3] Extract code to nbd_setup function to be used for many purposes |
Date: | Tue, 06 Dec 2011 08:59:55 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1 |
On 12/06/2011 07:56 AM, Chunyan Liu wrote:
Currently, the nbd_setup needs parameters: device, srcpath, flags, partition, dev_offset, nbdflags, sockpath, bindto, port, shared, persistent, verbose, sigterm_rfd. More than 10 parameters. I still didn't find a better way to reduce parameters. Making variables global is a workaround to avoid nbd_setup taking too many parameters. Actually, except for sigterm_rfd, all others are pared from command line options.
Reading again this patch, I am not sure why you are doing it this way.There is no reason why bdrv_new/open/delete has to be redone for every /dev/nbdX we try (or if there is a reason, _that_ is what should be fixed first). Also the "tail" of nbd_setup, basically the select loop, should not be tried multiple times.
I do not understand why you cannot simply do it like this: - in the server thread, do everything as it is now - pass "device" to the client thread instead of opening it in main()- in the client thread, either use "device" as it is or (if device == NULL, which implies find == 1) loop until nbd_init succeeds.
Am I just confused? Paolo
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