Commit a131de0a authored by Miklos Szeredi's avatar Miklos Szeredi Committed by Linus Torvalds
Browse files

fuse: no abort on interrupt 



Don't set 'aborted' flag on a request if it's interrupted.  We have to wait
for the answer anyway, and this would only a very little time while copying
the reply.

This means, that write() on the fuse device will not return -ENOENT during
normal operation, only if the filesystem is aborted by a forced umount or
through the fusectl interface.

This could simplify userspace code somewhat when backward compatibility with
earlier kernel versions is not required.

Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 819c4b3b

fs/fuse/dev.c

+24 −19
Original line number Diff line number Diff line
@@ -273,28 +273,41 @@ static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req) 
			queue_interrupt(fc, req);

	}



	if (req->force) {

		spin_unlock(&fc->lock);

		wait_event(req->waitq, req->state == FUSE_REQ_FINISHED);

		spin_lock(&fc->lock);

	} else {

	if (!req->force) {

		sigset_t oldset;



		/* Only fatal signals may interrupt this */

		block_sigs(&oldset);

		wait_answer_interruptible(fc, req);

		restore_sigs(&oldset);

	}



		if (req->aborted)

			goto aborted;

		if (req->state == FUSE_REQ_FINISHED)

			return;



		/* Request is not yet in userspace, bail out */

		if (req->state == FUSE_REQ_PENDING) {

			list_del(&req->list);

			__fuse_put_request(req);

			req->out.h.error = -EINTR;

	req->aborted = 1;

			return;

		}

	}



	/*

	 * Either request is already in userspace, or it was forced.

	 * Wait it out.

	 */

	spin_unlock(&fc->lock);

	wait_event(req->waitq, req->state == FUSE_REQ_FINISHED);

	spin_lock(&fc->lock);



	if (!req->aborted)

		return;



 aborted:

	BUG_ON(req->state != FUSE_REQ_FINISHED);

	if (req->locked) {

		/* This is uninterruptible sleep, because data is

		   being copied to/from the buffers of req.  During
@@ -305,14 +318,6 @@ static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req) 
		wait_event(req->waitq, !req->locked);

		spin_lock(&fc->lock);

	}

	if (req->state == FUSE_REQ_PENDING) {

		list_del(&req->list);

		__fuse_put_request(req);

	} else if (req->state == FUSE_REQ_SENT) {

		spin_unlock(&fc->lock);

		wait_event(req->waitq, req->state == FUSE_REQ_FINISHED);

		spin_lock(&fc->lock);

	}

}



static unsigned len_args(unsigned numargs, struct fuse_arg *args)

CRA Git | Maintained and supported by SUSTech CRA and CCSE