[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] xl block-attach
Ian Campbell wrote: > On Mon, 2011-01-31 at 15:10 +0000, Kamala Narasimhan wrote: > What are the syntaxes and how are they different? I was under the > impression that (roughly speaking) the comma separated stuff in the > config file simply became the individual arguments to block-attach, is > that not the case? > Kind of but not quite. Here is what I get from block-attach help (both xl/xm return the same btw) - ********* Usage: xl [-v] block-attach <Domain> <BackDev> <FrontDev> [<Mode>] [BackDomain] Create a new virtual block device. ********* >From the above it is not very evident what is acceptable for BackDev and FrontDev. So I looked at the code that parses these input (in xl). It takes backdev and looks for pdev type ('phy' or 'file' or 'tap') and if tap, looks for 'aio' or 'vhd' or 'qcow' or 'qcow2' (here it is mixing format with backend impl type) followed by pdev path. It then takes frontdev and interprets it to be vdev path and then it interprets mode to be read or write attribute. We could still keep the higher level arguments as is but our parser could interpret BackDev and FrontDev values the way it does for config file option. The way I have refactored the disk config parsing code (by dividing it into pdev/vdev/attrib chunks for parsing, we can simply reuse that parsing code in block-attach too! Kamala _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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