Re: [Qemu-devel] [PATCH] Merge NBD client/server int qemu-nbd

[Avi Kivity]

Laurent Vivier wrote:
> Le samedi 14 juin 2008 à 20:18 +0300, Avi Kivity a écrit :
>   
> > Laurent Vivier wrote:
> >     
> > > int timeout = 5;
> > > while ((fd = open(device, O_RDWR)) == -1 && timeout--)
> > >     sleep(1);
> > >
> > > Any suggestion ???
> > >
> > >   
> > >       
> > /sbin/udevsettle
> >     
>
> Why do you think udev is involved at this moment ?
>
> /dev/nbd0 is created when the module is loaded (thus before) and the
> partitions when the partition table is read (from within the open).
>   

It is udev that creates the devices, based on events it receives from 
the kernel.  Calling udevsettle after the kernel instructs udev to 
create the device files will wait until they are actually created.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.