[PATCH 2/2] ext4: fix ZERO_RANGE test failure in data journalling

[Namjae Jeon <namjae.jeon@samsung.com>]

xfstests generic/091 is failing when mounting ext4 with data=journal.
I think that this regression is same problem that occurred prior to collapse
range issue. So ZERO RANGE also need to call ext4_force_commit as
collapse range.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
---
 fs/ext4/extents.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 1c5e877..02143d6 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4743,6 +4743,15 @@ static long ext4_zero_range(struct file *file, loff_t offset,
 
 	mutex_lock(&EXT4_I(inode)->i_write_mutex);
 
+	/* Call ext4_force_commit to flush all data in case of data=journal. */
+	if (ext4_should_journal_data(inode)) {
+		ret = ext4_force_commit(inode->i_sb);
+		if (ret) {
+			mutex_unlock(&EXT4_I(inode)->i_write_mutex);
+			return ret;
+		}
+	}
+
 	/*
 	 * Write out all dirty pages to avoid race conditions
 	 * Then release them.
-- 
1.7.11-rc0