[PATCH 2/3] ext4: fix ZERO_RANGE test failure in data journalling mode

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From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>

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@xxxxxxxxxxx>
Signed-off-by: Ashish Sangwan <a.sangwan@xxxxxxxxxxx>
---
 fs/ext4/extents.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f386dd6..a64242f 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4742,6 +4742,13 @@ static long ext4_zero_range(struct file *file, loff_t offset,
 
 	trace_ext4_zero_range(inode, offset, len, mode);
 
+	/* 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)
+			return ret;
+	}
+
 	/*
 	 * Write out all dirty pages to avoid race conditions
 	 * Then release them.
-- 
1.7.11-rc0

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