From: Eric Sandeen <sandeen@redhat.com>
Date: Thu, 15 Nov 2012 03:22:05 +0000 (-0500)
Subject: ext4: init pagevec in ext4_da_block_invalidatepages
X-Git-Tag: firefly_0821_release~7541^2~94
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=97765f30c49d3023a6dafe7c48c7e520fca441f8;p=firefly-linux-kernel-4.4.55.git

ext4: init pagevec in ext4_da_block_invalidatepages

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

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 1dbf758c4964..7e56946a5199 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2199,6 +2199,8 @@ static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd)
 
 	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)