From: Vasily Averin <vvs@virtuozzo.com>
Date: Fri, 13 Sep 2019 18:17:11 +0300
Subject: fuse: fix missing unlock_page in fuse_writepage()
Git-commit: d5880c7a8620290a6c90ced7a0e8bd0ad9419601
Patch-mainline: v5.4-rc1
References: bsc#1174904

unlock_page() was missing in case of an already in-flight write against the
same page.

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Fixes: ff17be086477 ("fuse: writepage: skip already in flight")
Cc: <stable@vger.kernel.org> # v3.13
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/fuse/file.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index a2ea347c4d2c..8c7578b95d2c 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1861,6 +1861,7 @@ static int fuse_writepage(struct page *page, struct writeback_control *wbc)
 		WARN_ON(wbc->sync_mode == WB_SYNC_ALL);
 
 		redirty_page_for_writepage(wbc, page);
+		unlock_page(page);
 		return 0;
 	}