[PATCH 4.10 099/167] fuse: add missing FR_FORCE

From: Greg Kroah-Hartman
Date: Fri Mar 10 2017 - 04:35:29 EST

4.10-stable review patch. If anyone has any objections, please let me know.


From: Miklos Szeredi <mszeredi@xxxxxxxxxx>

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@xxxxxxxxxx>
Fixes: 5a18ec176c93 ("fuse: fix hang of single threaded fuseblk filesystem")
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

fs/fuse/file.c | 1 +
1 file changed, 1 insertion(+)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -100,6 +100,7 @@ static void fuse_file_put(struct fuse_fi
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);