linux-kernel - [PATCH v3 15/18] fuse,virtiofs: Define dax address space operations

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Date:   Wed, 19 Aug 2020 18:19:53 -0400
From:   Vivek Goyal <vgoyal@...hat.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvdimm@...ts.01.org, virtio-fs@...hat.com
Cc:     vgoyal@...hat.com, miklos@...redi.hu, stefanha@...hat.com,
        dgilbert@...hat.com, dan.j.williams@...el.com
Subject: [PATCH v3 15/18] fuse,virtiofs: Define dax address space operations

This is done along the lines of ext4 and xfs. I primarily wanted ->writepages
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@...hat.com>
---
 fs/fuse/file.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index f1ad8b95b546..0eecb4097c14 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2669,6 +2669,16 @@ static int fuse_writepages_fill(struct page *page,
 	return err;
 }
 
+static int fuse_dax_writepages(struct address_space *mapping,
+				struct writeback_control *wbc)
+{
+
+	struct inode *inode = mapping->host;
+	struct fuse_conn *fc = 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)
 {
@@ -4021,6 +4031,13 @@ static const struct address_space_operations fuse_file_aops  = {
 	.write_end	= fuse_write_end,
 };
 
+static const struct address_space_operations fuse_dax_file_aops  = {
+	.writepages	= fuse_dax_writepages,
+	.direct_IO	= noop_direct_IO,
+	.set_page_dirty	= noop_set_page_dirty,
+	.invalidatepage	= noop_invalidatepage,
+};
+
 void fuse_init_file_inode(struct inode *inode)
 {
 	struct fuse_inode *fi = get_fuse_inode(inode);
@@ -4036,6 +4053,8 @@ void fuse_init_file_inode(struct inode *inode)
 	fi->writepages = RB_ROOT;
 	fi->dmap_tree = RB_ROOT_CACHED;
 
-	if (fc->dax_dev)
+	if (fc->dax_dev) {
 		inode->i_flags |= S_DAX;
+		inode->i_data.a_ops = &fuse_dax_file_aops;
+	}
 }
-- 
2.25.4