[PATCH v2 23/30] fuse: Define dax address space operations

Vivek Goyal
2019-05-15T19:30:24Z

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@redhat.com>
---
fs/fuse/file.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index a053bcb9498d..2777355bc245 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2402,6 +2402,17 @@ 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,
+ NULL, fc->dax_dev, wbc);
+}
+
static int fuse_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
@@ -3707,6 +3718,13 @@ 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);
@@ -3724,5 +3742,6 @@ void fuse_init_file_inode(struct inode *inode)

if (fc->dax_dev) {
inode->i_flags |= S_DAX;
+ inode->i_data.a_ops = &fuse_dax_file_aops;
}
}
--
2.20.1