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.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 5a18ec176c93 ("fuse: fix hang of single threaded fuseblk filesystem")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 2401c5dabb2a..5ec5870e423a 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -100,6 +100,7 @@ static void fuse_file_put(struct fuse_file *ff, bool sync)
                         iput(req->misc.release.inode);
                         fuse_put_request(ff->fc, req);
                 } else if (sync) {
+                        __set_bit(FR_FORCE, &req->flags);
                         __clear_bit(FR_BACKGROUND, &req->flags);
                         fuse_request_send(ff->fc, req);
                         iput(req->misc.release.inode);