linux-kernel - [ 06/16] ext4: init pagevec in ext4_da_block

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Date:	Fri, 18 Jan 2013 17:21:44 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Lukas Czerner <lczerner@...hat.com>,
	Carlos Maiolino <cmaiolino@...hat.com>,
	Eric Sandeen <sandeen@...hat.com>,
	"Theodore Tso" <tytso@....edu>, CAI Qian <caiqian@...hat.com>
Subject: [ 06/16] ext4: init pagevec in ext4_da_block_invalidatepages

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Sandeen <sandeen@...hat.com>

commit 66bea92c69477a75a5d37b9bfed5773c92a3c4b4 upstream.

ext4_da_block_invalidatepages is missing a pagevec_init(),
which means that pvec->cold contains random garbage.

This affects whether the page goes to the front or
back of the LRU when ->cold makes it to
free_hot_cold_page()

Reviewed-by: Lukas Czerner <lczerner@...hat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@...hat.com>
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Signed-off-by: CAI Qian <caiqian@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/inode.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2199,6 +2199,8 @@ static void ext4_da_block_invalidatepage
 
 	index = mpd->first_page;
 	end   = mpd->next_page - 1;
+
+	pagevec_init(&pvec, 0);
 	while (index <= end) {
 		nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE);
 		if (nr_pages == 0)


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