dax: export a low-level __dax_zero_page_range helper

[cascardo/linux.git] / include / linux / dax.h

diff --git a/include/linux/dax.h b/include/linux/dax.h
index 7f853ff..90fbc99 100644 (file)
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -14,12 +14,19 @@ int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
 
 #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