
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
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