tree 15616935d9d15765dfa121c347196f8de1f25ea3
parent d0b9875d65c1abcc9d405d648660dfb919353959
author Christoph Hellwig <hch@infradead.org> 1384447834 -0800
committer Trond Myklebust <trond.myklebust@primarydata.com> 1389652190 -0500

nfs: page cache invalidation for dio

Make sure to properly invalidate the pagecache before performing direct I/O,
so that no stale pages are left around.  This matches what the generic
direct I/O code does.  Also take the i_mutex over the direct write submission
to avoid the lifelock vs truncate waiting for i_dio_count to decrease, and
to avoid having the pagecache easily repopulated while direct I/O is in
progrss.  Again matching the generic direct I/O code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>