From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 53CD4C04E87 for ; Thu, 27 Sep 2018 18:18:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 16104215F0 for ; Thu, 27 Sep 2018 18:18:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=osandov-com.20150623.gappssmtp.com header.i=@osandov-com.20150623.gappssmtp.com header.b="VbtSIMXj" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 16104215F0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=osandov.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-btrfs-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728385AbeI1Ahl (ORCPT ); Thu, 27 Sep 2018 20:37:41 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:44994 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728359AbeI1Ahk (ORCPT ); Thu, 27 Sep 2018 20:37:40 -0400 Received: by mail-pg1-f193.google.com with SMTP id g2-v6so2527149pgu.11 for ; Thu, 27 Sep 2018 11:18:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osandov-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ocSFXP7O1JUc5iJPcip80IbqCw8dHalc06/sU/WM7Ns=; b=VbtSIMXjOIJxw3zIp5D2Jbe/ciMod9y1Cw+jsDmd9QOitaT+GkvgeA00kJgaJ15bWW kczqRYZ2YX2NudovKmwam+l+3J/zolw7IhIBzmklG3MJwW9ad23JrzPvm+F5M+M6NJ6Q 0Mhm+s+OCT7VLAPr3iuag8vgt5xNLTji+eMS5ATZGvGqn4/LX/VL1dQVwTChz92VQHWs fXAX8lXozUtoS77Jijm0k0Wrs4XygxP/yXjRo88G6NqexA8hLdmLFHZX9mmxNhRV1B/l NnPNG1rrr94agLkOb5mV1+oaDDGsUVwN9LKZnTyyjweXlVcd6OjgZkkwLeYWu0+hlPb7 ug2w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ocSFXP7O1JUc5iJPcip80IbqCw8dHalc06/sU/WM7Ns=; b=im346q+NUGuASKfnPXOHyOrHb2KKaxBpd2+recTNU/05eKujnKbE+5NrJKOtN00gA7 FhhnnXWsllnErjpOu1aytfIaDafPMVE30a7TcqAVuD9X8pfshrOw0Z7q51ypwE+u/quJ oFN2RwUymkAXRW6zleOY3ZKTyNuQLIxTxEso6/ka934HwmGt6FN+yFBq1gPYHNm7LHzM TaebZbOUV6z7Pw/fUer9DA7FayXiaIp12yi7pvNX+2D7+kkCb0ntKZGO8/hUAuyWOQCn BGllJGgXy2PrJ3gH72++zZCmEvkBWtCY7XdtU427d6902tUCauCbotVOtlmoFJMx6Hrm liaw== X-Gm-Message-State: ABuFfogOtrkGxja7Q03X7e1VuWgx1Et1DRnVHu/9iPEz+FsgeJPhJ2C8 x+2dds8OZsEDqmkD0XWXvwh8pIZwAbc= X-Google-Smtp-Source: ACcGV62I52V4bUXBdNvnT4sH4FX9jm0Yga4su74IE1PYyAotxg6MJaZ7uJ+a1QxKzbcshOmLiZzI0w== X-Received: by 2002:a17:902:1ab:: with SMTP id b40-v6mr93392plb.82.1538072289745; Thu, 27 Sep 2018 11:18:09 -0700 (PDT) Received: from vader.thefacebook.com ([2620:10d:c090:200::5:3e64]) by smtp.gmail.com with ESMTPSA id p19-v6sm4086614pgh.60.2018.09.27.11.18.08 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 27 Sep 2018 11:18:09 -0700 (PDT) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: kernel-team@fb.com, David Sterba , linux-fsdevel@vger.kernel.org Subject: [PATCH v9 2/6] mm: export add_swap_extent() Date: Thu, 27 Sep 2018 11:17:34 -0700 Message-Id: <56d08bc182becd35eaa4605c970936caca312cae.1538072009.git.osandov@fb.com> X-Mailer: git-send-email 2.19.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Omar Sandoval Btrfs currently does not support swap files because swap's use of bmap does not work with copy-on-write and multiple devices. See commit 35054394c4b3 ("Btrfs: stop providing a bmap operation to avoid swapfile corruptions"). However, the swap code has a mechanism for the filesystem to manually add swap extents using add_swap_extent() from the ->swap_activate() aop. iomap has done this since commit 67482129cdab ("iomap: add a swapfile activation function"). Btrfs will do the same in a later patch, so export add_swap_extent(). Acked-by: Johannes Weiner Signed-off-by: Omar Sandoval --- mm/swapfile.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/swapfile.c b/mm/swapfile.c index d3f95833d12e..51cb30de17bc 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -2365,6 +2365,7 @@ add_swap_extent(struct swap_info_struct *sis, unsigned long start_page, list_add_tail(&new_se->list, &sis->first_swap_extent.list); return 1; } +EXPORT_SYMBOL_GPL(add_swap_extent); /* * A `swap extent' is a simple thing which maps a contiguous range of pages -- 2.19.0