[dm-devel] [PATCH 2/5] s390, dax: Add dax zero_page_range operation to dcssblk driver

[Vivek Goyal]

Add dax operation zero_page_range. This just calls generic helper
generic_dax_zero_page_range().

Suggested-by: Christoph Hellwig <hch at infradead.org>
Signed-off-by: Vivek Goyal <vgoyal at redhat.com>
---
 drivers/s390/block/dcssblk.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 63502ca537eb..f6709200bcd0 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -62,6 +62,7 @@ static const struct dax_operations dcssblk_dax_ops = {
 	.dax_supported = generic_fsdax_supported,
 	.copy_from_iter = dcssblk_dax_copy_from_iter,
 	.copy_to_iter = dcssblk_dax_copy_to_iter,
+	.zero_page_range = dcssblk_dax_zero_page_range,
 };
 
 struct dcssblk_dev_info {
@@ -941,6 +942,12 @@ dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
 	return __dcssblk_direct_access(dev_info, pgoff, nr_pages, kaddr, pfn);
 }
 
+static int dcssblk_dax_zero_page_range(struct dax_device *dax_dev,pgoff_t pgoff,
+				       unsigned offset, size_t len)
+{
+	return generic_dax_zero_page_range(dax_dev, pgoff, offset, len);
+}
+
 static void
 dcssblk_check_params(void)
 {
-- 
2.18.1