From patchwork Wed Dec 5 12:28:28 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Goldwyn Rodrigues X-Patchwork-Id: 10713981 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 9963214E2 for ; Wed, 5 Dec 2018 12:29:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 89BAE2C78C for ; Wed, 5 Dec 2018 12:29:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7E4612CB4D; Wed, 5 Dec 2018 12:29:00 +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,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 3C90A2C78C for ; Wed, 5 Dec 2018 12:29:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727698AbeLEM27 (ORCPT ); Wed, 5 Dec 2018 07:28:59 -0500 Received: from mx2.suse.de ([195.135.220.15]:48460 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727679AbeLEM26 (ORCPT ); Wed, 5 Dec 2018 07:28:58 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id D79E2AE61 for ; Wed, 5 Dec 2018 12:28:56 +0000 (UTC) From: Goldwyn Rodrigues To: linux-btrfs@vger.kernel.org Cc: Goldwyn Rodrigues Subject: [PATCH 03/10] btrfs: dax: read zeros from holes Date: Wed, 5 Dec 2018 06:28:28 -0600 Message-Id: <20181205122835.19290-4-rgoldwyn@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20181205122835.19290-1-rgoldwyn@suse.de> References: <20181205122835.19290-1-rgoldwyn@suse.de> 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: Goldwyn Rodrigues Signed-off-by: Goldwyn Rodrigues --- fs/btrfs/dax.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/dax.c b/fs/btrfs/dax.c index d614bf73bf8e..5a297674adec 100644 --- a/fs/btrfs/dax.c +++ b/fs/btrfs/dax.c @@ -54,7 +54,12 @@ ssize_t btrfs_file_dax_read(struct kiocb *iocb, struct iov_iter *to) BUG_ON(em->flags & EXTENT_FLAG_FS_MAPPING); - ret = em_dax_rw(inode, em, pos, len, to); + if (em->block_start == EXTENT_MAP_HOLE) { + u64 zero_len = min(em->len - (em->start - pos), len); + ret = iov_iter_zero(zero_len, to); + } else { + ret = em_dax_rw(inode, em, pos, len, to); + } if (ret < 0) goto out; pos += ret;