From: Prasad Joshi <prasadjoshi.linux@gmail.com>
Date: Sat, 26 Nov 2011 05:30:47 +0000 (+0530)
Subject: logfs: update page reference count for pined pages
X-Git-Tag: v3.3-rc2~1^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96150606e2fb82d242c9e4a414e4e922849f7bf7;p=pandora-kernel.git

logfs: update page reference count for pined pages

LogFS sets PG_private flag to indicate a pined page. We assumed that
marking a page as private is enough to ensure its existence. But
instead it is necessary to hold a reference count to the page.

The change resolves the following BUG

BUG: Bad page state in process flush-253:16  pfn:6a6d0
page flags: 0x100000000000808(uptodate|private)

Suggested-and-Acked-by: Joern Engel <joern@logfs.org>
Signed-off-by: Prasad Joshi <prasadjoshi.linux@gmail.com>
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