From: Miklos Szeredi <mszeredi@redhat.com>
Date: Wed, 22 Feb 2017 19:08:25 +0000 (+0100)
Subject: fuse: add missing FR_FORCE
X-Git-Tag: v3.12.72~29
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=39f8a4adde45a818f650a9f7ccc03fa6cbac356d;p=thirdparty%2Fkernel%2Fstable.git

fuse: add missing FR_FORCE

commit 2e38bea99a80eab408adee27f873a188d57b76cb upstream.

fuse_file_put() was missing the "force" flag for the RELEASE request when
sending synchronously (fuseblk).

If this flag is not set, then a sync request may be interrupted before it
is dequeued by the userspace filesystem.  In this case the OPEN won't be
balanced with a RELEASE.

[js] force is a variable, not a bit

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 5a18ec176c93 ("fuse: fix hang of single threaded fuseblk filesystem")
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index f6314cd3e3b0a..75dee32d41b52 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -128,6 +128,7 @@ static void fuse_file_put(struct fuse_file *ff, bool sync)
 		struct fuse_req *req = ff->reserved_req;
 
 		if (sync) {
+			req->force = 1;
 			req->background = 0;
 			fuse_request_send(ff->fc, req);
 			path_put(&req->misc.release.path);