2011/12/6 Paolo Bonzini
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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.
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).
Well, it's not "had to be redone", did it just to avoid passing too many parameters to nbd_setup. (otherwise, should pass "bs, dev_offset and fd_size to nbd_setup.) Can be moved out.
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
Nope. When device changes, both client thread and server thread should be refreshed. sockpath and sharing_fds[] is changed with different device.
- 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