s390,dcssblk,dax: Add dax zero_page_range operation to dcssblk driver (79fa974f) · Commits · 戴 / test

Add dax operation zero_page_range for dcssblk driver. Suggested-by:

drivers/s390/block/dcssblk.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -57,11 +57,26 @@ static size_t dcssblk_dax_copy_to_iter(struct dax_device *dax_dev,
		return copy_to_iter(addr, bytes, i);
		}

		static int dcssblk_dax_zero_page_range(struct dax_device *dax_dev,
		pgoff_t pgoff, size_t nr_pages)
		{
		long rc;
		void *kaddr;

		rc = dax_direct_access(dax_dev, pgoff, nr_pages, &kaddr, NULL);
		if (rc < 0)
		return rc;
		memset(kaddr, 0, nr_pages << PAGE_SHIFT);
		dax_flush(dax_dev, kaddr, nr_pages << PAGE_SHIFT);
		return 0;
		}

		static const struct dax_operations dcssblk_dax_ops = {
		.direct_access = dcssblk_dax_direct_access,
		.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 {