Commit 12597287 authored by Miklos Szeredi's avatar Miklos Szeredi
Browse files

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: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 338f2e3f

fs/fuse/dev.c

+45 −0
Original line number Diff line number Diff line
@@ -626,6 +626,51 @@ bool fuse_request_queue_background(struct fuse_conn *fc, struct fuse_req *req) 
	return queued;

}



static void fuse_simple_end(struct fuse_conn *fc, struct fuse_req *req)

{

	struct fuse_args *args = req->args;

	int err = req->out.h.error;



	if (!err && args->out_argvar) {

		BUG_ON(args->out_numargs == 0);

		args->out_args[args->out_numargs - 1].size =

			req->out.args[args->out_numargs - 1].size;

	}

	req->args->end(fc, req->args, req->out.h.error);

}



int fuse_simple_background(struct fuse_conn *fc, struct fuse_args *args,

			    gfp_t gfp_flags)

{

	struct fuse_req *req;



	if (args->force) {

		WARN_ON(!args->nocreds);

		req = __fuse_request_alloc(0, gfp_flags);

		if (!req)

			return -ENOMEM;

		__set_bit(FR_BACKGROUND, &req->flags);

	} else {

		WARN_ON(args->nocreds);

		req = __fuse_get_req(fc, 0, true);

		if (IS_ERR(req))

			return PTR_ERR(req);

	}



	fuse_args_to_req(req, args);



	req->args = args;

	req->end = fuse_simple_end;



	if (!fuse_request_queue_background(fc, req)) {

		fuse_put_request(fc, req);

		return -ENOTCONN;

	}



	return 0;

}

EXPORT_SYMBOL_GPL(fuse_simple_background);



void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req)

{

	WARN_ON(!req->end);

fs/fuse/fuse_i.h

+6 −0
Original line number Diff line number Diff line
@@ -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

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