[PATCH] fuse: introduce list for requests under I/O

Create a new list for requests in the process of being transfered to/from
userspace. This will be needed to be able to abort all requests even those
currently under I/O

Signed-off-by: Miklos Szeredi <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/fuse/dev.c

···
  */
 static void request_end(struct fuse_conn *fc, struct fuse_req *req)
 {
+	list_del(&req->list);
 	req->state = FUSE_REQ_FINISHED;
 	spin_unlock(&fuse_lock);
 	if (req->background) {
···
 
 	req = list_entry(fc->pending.next, struct fuse_req, list);
 	req->state = FUSE_REQ_READING;
-	list_del_init(&req->list);
+	list_move(&req->list, &fc->io);
 
 	in = &req->in;
 	reqsize = in->h.len;
···
 		request_end(fc, req);
 	else {
 		req->state = FUSE_REQ_SENT;
-		list_add_tail(&req->list, &fc->processing);
+		list_move_tail(&req->list, &fc->processing);
 		spin_unlock(&fuse_lock);
 	}
 	return reqsize;
···
 	if (!req)
 		goto err_unlock;
 
-	list_del_init(&req->list);
 	if (req->interrupted) {
 		spin_unlock(&fuse_lock);
 		fuse_copy_finish(&cs);
···
 		request_end(fc, req);
 		return -ENOENT;
 	}
+	list_move(&req->list, &fc->io);
 	req->out.h = oh;
 	req->locked = 1;
 	cs.req = req;
···
 	while (!list_empty(head)) {
 		struct fuse_req *req;
 		req = list_entry(head->next, struct fuse_req, list);
-		list_del_init(&req->list);
 		req->out.h.error = -ECONNABORTED;
 		request_end(fc, req);
 		spin_lock(&fuse_lock);

fs/fuse/fuse_i.h

···
  * A request to the client
  */
 struct fuse_req {
-	/** This can be on either unused_list, pending or processing
-	    lists in fuse_conn */
+	/** This can be on either unused_list, pending processing or
+	    io lists in fuse_conn */
 	struct list_head list;
 
 	/** Entry on the background list */
···
 
 	/** The list of requests being processed */
 	struct list_head processing;
+
+	/** The list of requests under I/O */
+	struct list_head io;
 
 	/** Requests put in the background (RELEASE or any other
 	    interrupted request) */

fs/fuse/inode.c

···
 		init_waitqueue_head(&fc->waitq);
 		INIT_LIST_HEAD(&fc->pending);
 		INIT_LIST_HEAD(&fc->processing);
+		INIT_LIST_HEAD(&fc->io);
 		INIT_LIST_HEAD(&fc->unused_list);
 		INIT_LIST_HEAD(&fc->background);
 		sema_init(&fc->outstanding_sem, 1); /* One for INIT */