tree b9b52451fc269f124312b91d6da6a5c894f4e6b9
parent 502be2a32f09f388e4ff34ef2e3ebcabbbb261da
author Steven Whitehouse <swhiteho@redhat.com> 1387376092 +0000
committer Steven Whitehouse <swhiteho@redhat.com> 1387536081 +0000

GFS2: Fix incorrect invalidation for DIO/buffered I/O

In patch 209806aba9d540dde3db0a5ce72307f85f33468f we allowed
local deferred locks to be granted against a cached exclusive
lock. That opened up a corner case which this patch now
fixes.

The solution to the problem is to check whether we have cached
pages each time we do direct I/O and if so to unmap, flush
and invalidate those pages. Since the glock state machine
normally does that for us, mostly the code will be a no-op.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>