This avoid needing a separate inefficient get_block based DAX zero_range
implementation in file systems.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
fs/iomap.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/fs/iomap.c b/fs/iomap.c
index 28a8fcb..a3e7dea 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -24,6 +24,7 @@
#include <linux/uio.h>
#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
+#include <linux/dax.h>
#include "internal.h"
typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
@@ -264,6 +265,15 @@ iomap_zero_range_actor(struct inode *inode, loff_t pos, loff_t count,
if (iomap->type == IOMAP_HOLE || iomap->type == IOMAP_UNWRITTEN)
return count;
+#ifdef CONFIG_FS_DAX
+ if (IS_DAX(inode)) {
+ status = dax_clear_sectors(iomap->bdev, iomap->blkno, count);
+ if (status)
+ return status;
+ return count;
+ }
+#endif
+
do {
unsigned offset, bytes;
--
2.1.4
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