From patchwork Thu Sep 20 05:02:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Omar Sandoval X-Patchwork-Id: 10606847 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 21FD06CB for ; Thu, 20 Sep 2018 05:02:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1221C2CD2D for ; Thu, 20 Sep 2018 05:02:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 066332CF0D; Thu, 20 Sep 2018 05:02:30 +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=-7.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,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 A60AE2CFB4 for ; Thu, 20 Sep 2018 05:02:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731251AbeITKn6 (ORCPT ); Thu, 20 Sep 2018 06:43:58 -0400 Received: from mail-pf1-f195.google.com ([209.85.210.195]:43663 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726028AbeITKn6 (ORCPT ); Thu, 20 Sep 2018 06:43:58 -0400 Received: by mail-pf1-f195.google.com with SMTP id j26-v6so3760009pfi.10 for ; Wed, 19 Sep 2018 22:02:28 -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=DUSqiXzd5tEI7BRCvZ4UP5yWx+fbQGqaRAkSodHfSPruynongqEhNNFenDtLO/vNBm cIvuPAQjBZkXSvAkWD74h+tc+BL3ODdl+oO1ArsJHBrS6O+eY6rN8YxQ16aCzOsOccEW NKJavT4yEDUyJEemJ/EhGcstP/2AYtmq5/hp3GPTfP1OZuDx7znbx0VKwsSKYCNc+++j F0b12LNHy0tVkC7XxuTX/OAM1t4dRrt5SR7P2gUezIvQS8hjR6Pfok6onFhTfdgxvw99 uC5R+6BITuVML62jhiuQDXra3VXjaygvinTVoKU1AZeiafPLn3DbUN50G8tH9xORyb0i eOnw== 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=Xu9TWo7fRJZhJgGEDGGMPu5yErT2E12fE/oWdmGocs18lrWFizhzeMv0PKuJLfVPso Z/q2oSHiBCSRflfYnUSHR6keX1oGSzXRQckWdU/U6kEdw6oPCLdto+bogwdXH9viT9L7 KMwAvrE2gXAUzsBi13MlPU6CRM9F1RkwkiJrDkxJ/QUs8m5K4+930A4+eoizle2a5tST 6/H+TJi2VhwYBAG/w/nlCrVVzIKN8ETQWA/+5nVM7XkNmBvwCclti5o/VO623kRa+B0Y 33wE0F0tS+AKXTHxl87wb1RmEyR6lwLVdOpk/9NQi4ZtEoJngg03in3J9cpmSx8VK1IH kJAQ== X-Gm-Message-State: APzg51DkVE4ZC51EzqaIwk+vAqOJu36pID1hAfS/e2CFVvMhAt/XfNLi VOQF/9OXYeYgUY7FNcj+crrP6OndAps= X-Google-Smtp-Source: ANB0Vdbtfx4UaecfB4lODOUWe71VuL1WfBfxXldupCPyhvxU1xs9CdR3+5jr2cEv406DmAn8QoSvGg== X-Received: by 2002:a62:9101:: with SMTP id l1-v6mr39259685pfe.226.1537419747751; Wed, 19 Sep 2018 22:02:27 -0700 (PDT) Received: from vader.thefacebook.com ([2620:10d:c090:180::1:7ae9]) by smtp.gmail.com with ESMTPSA id q6-v6sm27024885pgq.19.2018.09.19.22.02.26 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Sep 2018 22:02:27 -0700 (PDT) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: kernel-team@fb.com, David Sterba Subject: [PATCH v8 2/6] mm: export add_swap_extent() Date: Wed, 19 Sep 2018 22:02:13 -0700 Message-Id: X-Mailer: git-send-email 2.19.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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