Al Viro d45f00ae43 overlayfs: barriers for opening upper-layer directory
make sure that
	a) all stores done by opening struct file don't leak past storing
the reference in od->upperfile
	b) the lockless side has read dependency barrier

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-10-28 18:27:28 -04:00
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