tree cfb6ea8365c44a43ee254385c7d246f0418cedd0
parent 913f2d792ff584bf9ebf5968472b3e4ffe0fd9c8
author Linus Torvalds <torvalds@g5.osdl.org> 1134362297 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1134362297 -0800

Allow arbitrary read-only shared pfn-remapping too

The VM layer (for historical reasons) turns a read-only shared mmap into
a private-like mapping with the VM_MAYWRITE bit clear.  Thus checking
just VM_SHARED isn't actually sufficient.

So use a trivial helper function for the cases where we wanted to inquire
if a mapping was COW-like or not.

Moo!

Signed-off-by: Linus Torvalds <torvalds@osdl.org>