From patchwork Wed Mar 21 22:44:29 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Goldwyn Rodrigues X-Patchwork-Id: 10300507 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id F3E4360385 for ; Wed, 21 Mar 2018 22:44:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E1F0E2903D for ; Wed, 21 Mar 2018 22:44:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D6FAB29917; Wed, 21 Mar 2018 22:44:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 806762903D for ; Wed, 21 Mar 2018 22:44:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754032AbeCUWou (ORCPT ); Wed, 21 Mar 2018 18:44:50 -0400 Received: from mx2.suse.de ([195.135.220.15]:34968 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753996AbeCUWos (ORCPT ); Wed, 21 Mar 2018 18:44:48 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 433BFAC92; Wed, 21 Mar 2018 22:44:47 +0000 (UTC) From: Goldwyn Rodrigues To: linux-fsdevel@vger.kernel.org Cc: linux-mm@kvack.org, willy@infradead.org, david@fromorbit.com, Goldwyn Rodrigues Subject: [PATCH 3/3] fs: Use memalloc_nofs_save in generic_perform_write Date: Wed, 21 Mar 2018 17:44:29 -0500 Message-Id: <20180321224429.15860-4-rgoldwyn@suse.de> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180321224429.15860-1-rgoldwyn@suse.de> References: <20180321224429.15860-1-rgoldwyn@suse.de> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Goldwyn Rodrigues Perform generic_perform_write() under memalloc_nofs because any allocations should not recurse into fs writebacks. This covers grab and write cache pages, Signed-off-by: Goldwyn Rodrigues --- mm/filemap.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/filemap.c b/mm/filemap.c index 3c9ead9a1e32..5fe54614c69f 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -36,6 +36,7 @@ #include #include #include +#include #include "internal.h" #define CREATE_TRACE_POINTS @@ -3105,6 +3106,7 @@ ssize_t generic_perform_write(struct file *file, long status = 0; ssize_t written = 0; unsigned int flags = 0; + unsigned nofs_flags = memalloc_nofs_save(); do { struct page *page; @@ -3177,6 +3179,8 @@ ssize_t generic_perform_write(struct file *file, balance_dirty_pages_ratelimited(mapping); } while (iov_iter_count(i)); + memalloc_nofs_restore(nofs_flags); + return written ? written : status; } EXPORT_SYMBOL(generic_perform_write);