[PATCH v4 14/20] ext4: truncate_inode_pages() in orphan cleanup path

[Lukas Czerner <lczerner@redhat.com>]

Currently we do not tell mm to zero out tail of the page before truncate
in orphan_cleanup(). This is ok, because the page should not be
uptodate, however this may eventually change and I might cause problems.

Call truncate_inode_pages() as precautionary measure. Thanks Jan Kara
for pointing this out.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
---
 fs/ext4/super.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index dbc7c09..b971066 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2173,6 +2173,7 @@ static void ext4_orphan_cleanup(struct super_block *sb,
 			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
 				  inode->i_ino, inode->i_size);
 			mutex_lock(&inode->i_mutex);
+			truncate_inode_pages(inode->i_mapping, inode->i_size);
 			ext4_truncate(inode);
 			mutex_unlock(&inode->i_mutex);
 			nr_truncates++;
-- 
1.7.7.6

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