From: Jan Kara <jack@suse.cz>
Date: Sun, 20 Nov 2016 23:08:05 +0000 (-0500)
Subject: ext4: use iomap for zeroing blocks in DAX mode
X-Git-Tag: v4.14-rc1~1901^2~34
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=47e6935136b1f9fbda59cd929409f8e7cee4a1e4;p=platform%2Fkernel%2Flinux-rpi.git

ext4: use iomap for zeroing blocks in DAX mode

Use iomap infrastructure for zeroing blocks when in DAX mode.
ext4_iomap_begin() handles read requests just fine and that's all that
is needed for iomap_zero_range().

Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5e0526f..6d186ca 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3859,8 +3859,10 @@ static int ext4_block_zero_page_range(handle_t *handle,
 	if (length > max || length < 0)
 		length = max;
 
-	if (IS_DAX(inode))
-		return dax_zero_page_range(inode, from, length, ext4_get_block);
+	if (IS_DAX(inode)) {
+		return iomap_zero_range(inode, from, length, NULL,
+					&ext4_iomap_ops);
+	}
 	return __ext4_block_zero_page_range(handle, mapping, from, length);
 }