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 fbd6978..bd500c3 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1778,7 +1778,7 @@ 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);