From: Vivek Goyal Date: Fri, 28 Feb 2020 16:34:53 +0000 (-0500) Subject: s390,dcssblk,dax: Add dax zero_page_range operation to dcssblk driver X-Git-Tag: v5.7-rc1~45^2^2~4 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=79fa974ff6bc3f7711f409c88a9552ab97b9ecb5;p=thirdparty%2Fkernel%2Flinux.git s390,dcssblk,dax: Add dax zero_page_range operation to dcssblk driver Add dax operation zero_page_range for dcssblk driver. Suggested-by: Christoph Hellwig Signed-off-by: Vivek Goyal Reviewed-by: Gerald Schaefer CC: linux-s390@vger.kernel.org Link: https://lore.kernel.org/r/20200228163456.1587-4-vgoyal@redhat.com Signed-off-by: Dan Williams --- diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index 63502ca537eb8..ab3e2898816cf 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -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 {