fuse: add simple background helper

Create a helper named fuse_simple_background() that is similar to
fuse_simple_request().  Unlike the latter, it returns immediately and calls
the supplied 'end' callback when the reply is received.

The supplied 'args' pointer is stored in 'fuse_req' which allows the
callback to interpret the output arguments decoded from the reply.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index b62a3e37ea4c..8f46c5549e57 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -301,6 +301,7 @@ struct fuse_args {
 	bool page_replace:1;
 	struct fuse_in_arg in_args[3];
 	struct fuse_arg out_args[2];
+	void (*end)(struct fuse_conn *fc, struct fuse_args *args, int error);
 };
 
 struct fuse_args_pages {
@@ -381,6 +382,9 @@ struct fuse_req {
 	/** Entry on the interrupts list  */
 	struct list_head intr_entry;
 
+	/* Input/output arguments */
+	struct fuse_args *args;
+
 	/** refcount */
 	refcount_t count;
 
@@ -948,6 +952,8 @@ void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
  * Simple request sending that does request allocation and freeing
  */
 ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
+int fuse_simple_background(struct fuse_conn *fc, struct fuse_args *args,
+			   gfp_t gfp_flags);
 
 /**
  * Send a request in the background