block/xen-blkfront: split get_grant in 2
Prepare the code to support 64KB page granularity. The first implementation will use a full Linux page per indirect and persistent grant. When non-persistent grant is used, each page of a bio request may be split in multiple grant. Furthermore, the field page of the grant structure is only used to copy data from persistent grant or indirect grant. Avoid to set it for other use case as it will have no meaning given the page will be split in multiple grant. Provide 2 functions, to setup indirect grant, the other for bio page. Signed-off-by:Julien Grall <julien.grall@citrix.com> Acked-by:
Roger Pau Monné <roger.pau@citrix.com> Signed-off-by:
David Vrabel <david.vrabel@citrix.com>
parent
a7a6df22
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