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Subject[PATCH 16/20] fuse,virtiofs: Define dax address space operations
Date
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 | 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;
}

+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)
{
@@ -4032,6 +4042,13 @@ 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);
@@ -4049,5 +4066,6 @@ 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
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