tree 94a35faa65ea9cf5956ee6eaa04ab65c7abb17ff
parent a879211bf1d70339e429603805c014450c275f2a
author Daniel De Graaf <dgdegra@tycho.nsa.gov> 1296753541 -0500
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1297710531 -0500

xen-gntdev: Add reference counting to maps

This allows userspace to perform mmap() on the gntdev device and then
immediately close the filehandle or remove the mapping using the
remove ioctl, with the mapped area remaining valid until unmapped.
This also fixes an infinite loop when a gntdev device is closed
without first unmapping all areas.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>