From patchwork Thu Apr 12 15:08:03 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miklos Szeredi X-Patchwork-Id: 10338821 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 A4221604D4 for ; Thu, 12 Apr 2018 15:22:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 99DC925F31 for ; Thu, 12 Apr 2018 15:22:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8E0302785D; Thu, 12 Apr 2018 15:22:32 +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=unavailable 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 4064225F31 for ; Thu, 12 Apr 2018 15:22:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754207AbeDLPVp (ORCPT ); Thu, 12 Apr 2018 11:21:45 -0400 Received: from mail-wr0-f195.google.com ([209.85.128.195]:42768 "EHLO mail-wr0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753355AbeDLPIq (ORCPT ); Thu, 12 Apr 2018 11:08:46 -0400 Received: by mail-wr0-f195.google.com with SMTP id s18so5467834wrg.9 for ; Thu, 12 Apr 2018 08:08:46 -0700 (PDT) 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; bh=6xlVJNVlQUYTNJipT+77HXz6tcjc4xGV3DouaTBb2BA=; b=nhi+XsndzTIjfQr15Qjy4c4gHRRBUEhWOsbUC//FRn0J8GkTaG6gpZwPI5R0cAjDtk zWh2e5hWzOtg1jYu5oHP7qvq6qIcdiE7rwfJbKi83+snlMwxxqQvrvRMPdOz3Fpi420j b/PLUC/zLHvLSqE2MdLBenXOlfSHyeKltC7ahHyoLnZkd8+wRkoPZ4cKQRCb885VGZ5n TbIu8YdwHevxlIUfSQMJ8Ms1UpdLDA7FGSAPsUYADJhxgON/I41JqPQt6Ze7xIjp8RUp qLr6NbjuLCF0lWTmfFcjSUCyLfvrv+5Gnu8Rc8yBm9SjfoeFnUYqtNht8lfDRAJDK2k8 rMjw== X-Gm-Message-State: ALQs6tCZCRdTnCshlcEDjp/fIyD5v3OVxMB2xbgkmslY6rn6Jh3Crn5C 4IxGmou8qBdITHouS4kQY+ZYpg== X-Google-Smtp-Source: AIpwx49/6dsaWzsIm2IPEhSz8wuOiJXz4ecfvzI/LOY+b2Kc/awtIIyV748xaxxCqlrQw+EiZGG7Sg== X-Received: by 10.223.225.71 with SMTP id f7mr1048302wri.172.1523545725711; Thu, 12 Apr 2018 08:08:45 -0700 (PDT) Received: from veci.piliscsaba.redhat.com (catv-176-63-54-97.catv.broadband.hu. [176.63.54.97]) by smtp.gmail.com with ESMTPSA id p197sm2621783wme.43.2018.04.12.08.08.44 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 12 Apr 2018 08:08:45 -0700 (PDT) From: Miklos Szeredi To: linux-unionfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 12/35] ovl: readd write_iter Date: Thu, 12 Apr 2018 17:08:03 +0200 Message-Id: <20180412150826.20988-13-mszeredi@redhat.com> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180412150826.20988-1-mszeredi@redhat.com> References: <20180412150826.20988-1-mszeredi@redhat.com> 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 Implement stacked writes. Signed-off-by: Miklos Szeredi --- fs/overlayfs/file.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c index a19429c5965d..b98204c1c19c 100644 --- a/fs/overlayfs/file.c +++ b/fs/overlayfs/file.c @@ -184,9 +184,48 @@ static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter) return ret; } +static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter) +{ + struct file *file = iocb->ki_filp; + struct inode *inode = file_inode(file); + struct fd real; + const struct cred *old_cred; + ssize_t ret; + + if (!iov_iter_count(iter)) + return 0; + + inode_lock(inode); + /* Update mode */ + ovl_copyattr(ovl_inode_real(inode), inode); + ret = file_remove_privs(file); + if (ret) + goto out_unlock; + + ret = ovl_real_file(file, &real); + if (ret) + goto out_unlock; + + old_cred = ovl_override_creds(file_inode(file)->i_sb); + ret = vfs_iter_write(real.file, iter, &iocb->ki_pos, + ovl_iocb_to_rwf(iocb)); + revert_creds(old_cred); + + /* Update size */ + ovl_copyattr(ovl_inode_real(inode), inode); + + fdput(real); + +out_unlock: + inode_unlock(inode); + + return ret; +} + const struct file_operations ovl_file_operations = { .open = ovl_open, .release = ovl_release, .llseek = ovl_llseek, .read_iter = ovl_read_iter, + .write_iter = ovl_write_iter, };