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xen-devel
[Xen-devel] question about io path in the front/backend
hi
I have read some documents and wiki about split driver in xen,and I am
confused about the I/O path ,in which a sys_read() pass through the domU
and dom0,does sys_read() in the domU pass through vfs and ,say ,ext3fs
in domU,and insert request into the requeest_queue of the
frontend-driver,is it right?
and then ,say domU sets up with a *.img file in the dom0, then what
does frontend and backend driver do?
does frontend transmit the request to the backend ,is it right?
and then what does backend driver do ? does backend transfer the
request to the phyiscal driver in the dom0 ,is it right?
or does backend transfer the request into some read()operation ,and
submit it to the vfs and ,say,ext3fs in dom0, and do another relatively
complete io path in the dom0,is it right?
or if backend transfer the request to physical driver directly, how
does the backend deal with the request's virtual address ,and how does
backend manage bio buffer ,does physical driver and backend and frontend
share the bio buffer in some way, or what does xen deal with it ?
I am confused about all that ,could someone help me
Thanks in advance
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