dax: export a low-level __dax_zero_page_range helper
This allows XFS to perform zeroing using the iomap infrastructure and
avoid buffer heads.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christoph Hellwig <hch@lst.de>
[vishal: fix conflicts with dax-error-handling]
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 7f853ff..90fbc99 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -14,12 +14,19 @@
#ifdef CONFIG_FS_DAX
struct page *read_dax_sector(struct block_device *bdev, sector_t n);
+int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
+ unsigned int offset, unsigned int length);
#else
static inline struct page *read_dax_sector(struct block_device *bdev,
sector_t n)
{
return ERR_PTR(-ENXIO);
}
+static inline int __dax_zero_page_range(struct block_device *bdev,
+ sector_t sector, unsigned int offset, unsigned int length)
+{
+ return -ENXIO;
+}
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE