From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-2266183-1527606808-2-11748811046704121609 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no ("Email failed DMARC policy for domain") X-Spam-charsets: X-IgnoreVacation: yes ("Email failed DMARC policy for domain") X-Resolved-to: linux@kroah.com X-Delivered-to: linux@kroah.com X-Mail-from: linux-fsdevel-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t= 1527606808; b=YII23J8QxUa42l2LhZi/+89CkAIekeriOuyQrrD7meUf1YpvxU 4tKv4UBja64KDMSZwtIN4JbFBJTlfKKNCp1686Ynk9XjcUfZcIvaYrd/3DW6wB7U 6uuIVJespkaoQMcU71BIhYPUBdSsYWwuBcdjzm8OVJ5/wyAuB7Jc41D0sIoETN41 zLdadO1n21hTjssD5pYEhrfbGQ96xRJQo2S0s7d17mvE45wjGBo+bEJC+A8W8ftn lRLnamivQBjUTuH5nlJAzU14psjPkjuXV1o+kGXuES6BmCDwW/MxS9hlrlxjgug/ 0e7FVe5I1ZiGI7NO50HzLcvXHQ23bmfHvTyA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:sender:list-id; s=fm2; t=1527606808; bh= 3z5BGnZ1dMsqKneG2l6CPh5OVWM/P4fbH813ml2k080=; b=WZlhx0Me/iN0s0Nv hzjBNmZGVogHiiG5h5t/Rwwyr/HpRxoTcE4zIzyOAJ+3Tbx/YUm+MP3FcaT5lVOZ WM6+3xQ5xen6JGHg3a75LIJOwG++updKBQJmV3vnXykMqicAHvcHiZNsW7AdR0Fh 1BM5QnV6ENGJl0RycNEsqXdQq2cTr0aIf1fujAmhP00wzxAIhJzIkewrr7vOmm31 3sESkjMdXOqL6PPNqG4TlTCFxHtGDu/UsACJsxbaFo6jrLk1xomjaqgxTkq9HmTm LjKty8lL6S1W7t6VDARNGAaE5H+62DDsWSbPgZhdJ3TAp2s7vmso7pTNDjykrmjj Z68oog== ARC-Authentication-Results: i=1; mx4.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=fail (p=none,has-list-id=yes,d=none) header.from=redhat.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-fsdevel-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-google-dkim=pass (2048-bit rsa key) header.d=1e100.net header.i=@1e100.net header.b=tgPBsQ2P; x-ptr=pass smtp.helo=vger.kernel.org policy.ptr=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=redhat.com header.result=pass header_is_org_domain=yes; x-vs=clean score=0 state=0 Authentication-Results: mx4.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=fail (p=none,has-list-id=yes,d=none) header.from=redhat.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-fsdevel-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-google-dkim=pass (2048-bit rsa key) header.d=1e100.net header.i=@1e100.net header.b=tgPBsQ2P; x-ptr=pass smtp.helo=vger.kernel.org policy.ptr=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=redhat.com header.result=pass header_is_org_domain=yes; x-vs=clean score=0 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfKwqUU0sdMgG11J3YfsjMNMC8fWaN0L2097/GAtPNOwchp6pziqnu+OAYMiyyFcTEVjFGL7r9EGGPS2vDKG1LiIWE3c9SV+SYIeuq7to4Kg6Lgwa2KXl L1kbt+ef4ebr5bDqYEz7MWKn+AFnc32AX1uIt7VxjxYmRtsFNEm7uTnEyERLoD3bcTNxDkkmAZJhSMbzITmJc803oyS9wdNYjD7f0qpF5Gs/ByNmB8TUm26r X-CM-Analysis: v=2.3 cv=JLoVTfCb c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=VUJBJC2UJ8kA:10 a=20KFwNOVAAAA:8 a=aDEGPfzhpcUtIpsYiqsA:9 a=qiGbVALeC94A:10 a=qzgJG8r8dzAA:10 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935621AbeE2PNT (ORCPT ); Tue, 29 May 2018 11:13:19 -0400 Received: from mail-wm0-f66.google.com ([74.125.82.66]:51022 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934941AbeE2OoC (ORCPT ); Tue, 29 May 2018 10:44:02 -0400 X-Google-Smtp-Source: AB8JxZqlFkCaHT+u94fXRN7WHv9F0zZijqUZlFB5lR0hkyQWbTecYdfd4D0r4uHz1vkMwyue1/G77Q== From: Miklos Szeredi To: linux-unionfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 17/39] ovl: add ovl_write_iter() Date: Tue, 29 May 2018 16:43:17 +0200 Message-Id: <20180529144339.16538-18-mszeredi@redhat.com> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180529144339.16538-1-mszeredi@redhat.com> References: <20180529144339.16538-1-mszeredi@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org X-Mailing-List: linux-fsdevel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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 bbc40a14acf8..a7af56861aa5 100644 --- a/fs/overlayfs/file.c +++ b/fs/overlayfs/file.c @@ -195,9 +195,48 @@ 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_fdget(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, }; -- 2.14.3