From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:57846 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727048AbgBGU1L (ORCPT ); Fri, 7 Feb 2020 15:27:11 -0500 From: Vivek Goyal Subject: [PATCH v3 4/7] s390,dcssblk,dax: Add dax zero_page_range operation to dcssblk driver Date: Fri, 7 Feb 2020 15:26:49 -0500 Message-Id: <20200207202652.1439-5-vgoyal@redhat.com> In-Reply-To: <20200207202652.1439-1-vgoyal@redhat.com> References: <20200207202652.1439-1-vgoyal@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: linux-s390-owner@vger.kernel.org List-ID: To: linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org, hch@infradead.org, dan.j.williams@intel.com Cc: dm-devel@redhat.com, vishal.l.verma@intel.com, vgoyal@redhat.com, linux-s390@vger.kernel.org Add dax operation zero_page_range for dcssblk driver. CC: linux-s390@vger.kernel.org Suggested-by: Christoph Hellwig Signed-off-by: Vivek Goyal --- drivers/s390/block/dcssblk.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index 63502ca537eb..331abab5d066 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -57,11 +57,28 @@ static size_t dcssblk_dax_copy_to_iter(struct dax_dev= ice *dax_dev, return copy_to_iter(addr, bytes, i); } =20 +static int dcssblk_dax_zero_page_range(struct dax_device *dax_dev, u64 o= ffset, + size_t len) +{ + long rc; + void *kaddr; + pgoff_t pgoff =3D offset >> PAGE_SHIFT; + unsigned page_offset =3D offset_in_page(offset); + + rc =3D dax_direct_access(dax_dev, pgoff, 1, &kaddr, NULL); + if (rc < 0) + return rc; + memset(kaddr + page_offset, 0, len); + dax_flush(dax_dev, kaddr + page_offset, len); + return 0; +} + static const struct dax_operations dcssblk_dax_ops =3D { .direct_access =3D dcssblk_dax_direct_access, .dax_supported =3D generic_fsdax_supported, .copy_from_iter =3D dcssblk_dax_copy_from_iter, .copy_to_iter =3D dcssblk_dax_copy_to_iter, + .zero_page_range =3D dcssblk_dax_zero_page_range, }; =20 struct dcssblk_dev_info { --=20 2.20.1