[PATCH v2 16/20] fuse,virtiofs: Define dax address space operations

[Vivek Goyal]

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 <vgo...@redhat.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 00ad27216cc3..54708cb24da0 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)
 {
@@ -4030,6 +4040,13 @@ 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);
@@ -4045,6 +4062,8 @@ 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