[RFC 19/19] erofs: support on demand read

[Jeffle Xu]

Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
---
 fs/erofs/fscache.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index c849d3a89520..3d254cf7a0e3 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -83,9 +83,15 @@ static void erofs_priv_cleanup(struct address_space *mapping, void *netfs_priv)
 {
 }
 
+static void erofs_issue_op(struct netfs_read_subrequest *subreq)
+{
+	netfs_demand_read(subreq);
+}
+
 const struct netfs_read_request_ops erofs_req_ops = {
 	.begin_cache_operation  = erofs_begin_cache_operation,
 	.cleanup		= erofs_priv_cleanup,
+	.issue_op		= erofs_issue_op,
 };
 
 struct page *erofs_readpage_from_fscache(struct fscache_cookie *cookie,
-- 
2.27.0