From: Steven Whitehouse <swhiteho@redhat.com>
Date: Tue, 3 May 2011 10:49:19 +0000 (+0100)
Subject: GFS2: Improve bug trap code in ->releasepage()
X-Git-Tag: v3.0-rc1~384^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f065d36508f283ee6cbeb05829f032d0b782a16;p=pandora-kernel.git

GFS2: Improve bug trap code in ->releasepage()

If the buffer is dirty or pinned, then as well as printing a
warning, we should also refuse to release the page in
question.

Currently this can occur if there is a race between mmap()ed
writers and O_DIRECT on the same file. With the addition of
->launder_page() in the future, we should be able to close
this gap.

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