xen/gntdev: safely unmap grants in case they are still in use

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Use gnttab_unmap_refs_async() to wait until the mapped pages are no
longer in use before unmapping them.

This allows userspace programs to safely use Direct I/O and AIO to a
network filesystem which may retain refs to pages in queued skbs after
the filesystem I/O has completed.

Signed-off-by: Jennifer Herbert <jennifer.herbert@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

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Jennifer Herbert 2015-01-05 15:07:46 +00:00 • committed by David Vrabel

parent 1401c00e59

commit 745282256c

1 changed files with 31 additions and 5 deletions

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drivers/xen/gntdev.c

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