Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Vivek Goyal <vgoyal@redhat.com>
To:     linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-nvdimm@lists.01.org, virtio-fs@redhat.com, miklos@szeredi.hu
Cc:     vgoyal@redhat.com, stefanha@redhat.com, dgilbert@redhat.com,
        mst@redhat.com
Subject: [PATCH 16/20] fuse,virtiofs: Define dax address space operations
Date:   Wed,  4 Mar 2020 11:58:41 -0500
Message-Id: <20200304165845.3081-17-vgoyal@redhat.com>
In-Reply-To: <20200304165845.3081-1-vgoyal@redhat.com>
References: <20200304165845.3081-1-vgoyal@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

This is done along the lines of ext4 and xfs. I primarily wanted ->writep=
ages
hook at this time so that I could call into dax_writeback_mapping_range()=
.
This in turn will decide which pfns need to be written back.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
---
 fs/fuse/file.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index ab56396cf661..619aff6b5f44 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2696,6 +2696,16 @@ static int fuse_writepages_fill(struct page *page,
 	return err;
 }
=20
+static int fuse_dax_writepages(struct address_space *mapping,
+				struct writeback_control *wbc)
+{
+
+	struct inode *inode =3D mapping->host;
+	struct fuse_conn *fc =3D get_fuse_conn(inode);
+
+	return dax_writeback_mapping_range(mapping, fc->dax_dev, wbc);
+}
+
 static int fuse_writepages(struct address_space *mapping,
 			   struct writeback_control *wbc)
 {
@@ -4032,6 +4042,13 @@ static const struct address_space_operations fuse_=
file_aops  =3D {
 	.write_end	=3D fuse_write_end,
 };
=20
+static const struct address_space_operations fuse_dax_file_aops  =3D {
+	.writepages	=3D fuse_dax_writepages,
+	.direct_IO	=3D noop_direct_IO,
+	.set_page_dirty	=3D noop_set_page_dirty,
+	.invalidatepage	=3D noop_invalidatepage,
+};
+
 void fuse_init_file_inode(struct inode *inode)
 {
 	struct fuse_inode *fi =3D get_fuse_inode(inode);
@@ -4049,5 +4066,6 @@ void fuse_init_file_inode(struct inode *inode)
=20
 	if (fc->dax_dev) {
 		inode->i_flags |=3D S_DAX;
+		inode->i_data.a_ops =3D &fuse_dax_file_aops;
 	}
 }
--=20
2.20.1