David van Moolenbroek 0a2a08739e libfsdriver: clear VM cache only if used
As part of its built-in mmap emulation support for "none" file system
services, libfsdriver clears the VM cache upon exit.  However, for
trivial file systems which do not even support reading from files, the
the VM cache need to be cleared either.  With this patch, the VM cache
is cleared only when modified, so that such trivial file systems need
not be given CLEARCACHE permission.

Change-Id: I518c092443455302b9b9728f10a3f894d2c8036b
2015-06-23 14:38:54 +00:00
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