From: Chao Yu <chao2.yu@samsung.com>
Date: Thu, 5 Dec 2013 01:54:56 +0000 (+0800)
Subject: f2fs: avoid unneeded page release for correct _count of page
X-Git-Tag: v3.14-rc1~122^2~49
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b9987a277f1ec9dba203d04c3a20d967c01a1fba;p=pandora-kernel.git

f2fs: avoid unneeded page release for correct _count of page

In find_fsync_dnodes() and recover_data(), our flow is like this:

->f2fs_submit_page_bio()
	-> f2fs_put_page()
		-> page_cache_release()	---- page->_count declined to zero.
->__free_pages()
	-> put_page_testzero() ---- page->_count will be declined again.

We will get a segment fault in put_page_testzero when CONFIG_DEBUG_VM
is on, or return MM with a bad page with wrong _count num.

So let's just release this page.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
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