From: Sage Weil <sage@newdream.net>
Date: Wed, 24 Aug 2011 21:07:01 +0000 (-0700)
Subject: Revert "ceph: don't truncate dirty pages in invalidate work thread"
X-Git-Tag: v3.2-rc1~126^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=83eaea22bdfc9e1cec88f81be5b64f30f6c37e8b;p=pandora-kernel.git

Revert "ceph: don't truncate dirty pages in invalidate work thread"

This reverts commit c9af9fb68e01eb2c2165e1bc45cfeeed510c64e6.

We need to block and truncate all pages in order to reliably invalidate
them.  Otherwise, we could:

 - have some uptodate pages in the cache
 - queue an invalidate
 - write(2) locks some pages
 - invalidate_work skips them
 - write(2) only overwrites part of the page
 - page now dirty and uptodate
 -> partial leakage of invalidated data

It's not entirely clear why we started skipping locked pages in the first
place.  I just ran this through fsx and didn't see any problems.

Signed-off-by: Sage Weil <sage@newdream.net>
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