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: v4.11-rc1~14^2~2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2e38bea99a80eab408adee27f873a188d57b76cb;p=karo-tx-linux.git

fuse: add missing FR_FORCE

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")
Cc: <stable@vger.kernel.org> # v2.6.38+
---

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);