From: Miklos Szeredi <mszeredi@redhat.com>
Date: Wed, 16 Jan 2019 09:27:59 +0000 (+0100)
Subject: fuse: decrement NR_WRITEBACK_TEMP on the right page
X-Git-Tag: v4.9.156~23
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4f3d69898e1a4838efbfa593b2953533a0c86657;p=platform%2Fkernel%2Flinux-amlogic.git

fuse: decrement NR_WRITEBACK_TEMP on the right page

commit a2ebba824106dabe79937a9f29a875f837e1b6d4 upstream.

NR_WRITEBACK_TEMP is accounted on the temporary page in the request, not
the page cache page.

Fixes: 8b284dc47291 ("fuse: writepages: handle same page rewrites")
Cc: <stable@vger.kernel.org> # v3.13
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 1cd46e667e3d..30a607473621 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1772,7 +1772,7 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
 		spin_unlock(&fc->lock);
 
 		dec_wb_stat(&bdi->wb, WB_WRITEBACK);
-		dec_node_page_state(page, NR_WRITEBACK_TEMP);
+		dec_node_page_state(new_req->pages[0], NR_WRITEBACK_TEMP);
 		wb_writeout_inc(&bdi->wb);
 		fuse_writepage_free(fc, new_req);
 		fuse_request_free(new_req);