From patchwork Mon Nov 28 21:27:23 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 9450463 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 5DBA3600CB for ; Mon, 28 Nov 2016 21:28:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5060027FA9 for ; Mon, 28 Nov 2016 21:28:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 454852807E; Mon, 28 Nov 2016 21:28:49 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id DECF727FA9 for ; Mon, 28 Nov 2016 21:28:48 +0000 (UTC) Received: from localhost ([::1]:33114 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cBTTj-0003yU-Ux for patchwork-qemu-devel@patchwork.kernel.org; Mon, 28 Nov 2016 16:28:47 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59342) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cBTSY-0003Mo-1n for qemu-devel@nongnu.org; Mon, 28 Nov 2016 16:27:35 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cBTSW-0003NW-M6 for qemu-devel@nongnu.org; Mon, 28 Nov 2016 16:27:34 -0500 Received: from mail.kernel.org ([198.145.29.136]:37656) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cBTSW-0003NE-BS for qemu-devel@nongnu.org; Mon, 28 Nov 2016 16:27:32 -0500 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 72527201FE; Mon, 28 Nov 2016 21:27:30 +0000 (UTC) Received: from sstabellini-ThinkPad-X260.hsd1.ca.comcast.net (96-82-76-110-static.hfc.comcastbusiness.net [96.82.76.110]) (using TLSv1.2 with cipher AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 28FE7201EF; Mon, 28 Nov 2016 21:27:29 +0000 (UTC) From: Stefano Stabellini To: aneesh.kumar@linux.vnet.ibm.com Date: Mon, 28 Nov 2016 13:27:23 -0800 Message-Id: <1480368444-4310-3-git-send-email-sstabellini@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1480368444-4310-1-git-send-email-sstabellini@kernel.org> References: <1480368444-4310-1-git-send-email-sstabellini@kernel.org> X-Virus-Scanned: ClamAV using ClamSMTP X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 198.145.29.136 Subject: [Qemu-devel] [PATCH v2 3/4] 9pfs: call v9fs_init_qiov_from_pdu before v9fs_pack X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: xen-devel@lists.xensource.com, anthony.perard@citrix.com, sstabellini@kernel.org, groug@kaod.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP v9fs_xattr_read should not access VirtQueueElement elems directly. Move v9fs_init_qiov_from_pdu up in the file and call v9fs_init_qiov_from_pdu before v9fs_pack. Use v9fs_pack on the new iovec. Signed-off-by: Stefano Stabellini Reviewed-by: Greg Kurz --- Changes in v2: - add a call to qemu_iovec_destroy - fix commit description --- hw/9pfs/9p.c | 59 ++++++++++++++++++++++++++++++----------------------------- 1 file changed, 30 insertions(+), 29 deletions(-) diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c index 5a20a13..79d7201 100644 --- a/hw/9pfs/9p.c +++ b/hw/9pfs/9p.c @@ -1633,14 +1633,39 @@ out_nofid: pdu_complete(pdu, err); } +/* + * Create a QEMUIOVector for a sub-region of PDU iovecs + * + * @qiov: uninitialized QEMUIOVector + * @skip: number of bytes to skip from beginning of PDU + * @size: number of bytes to include + * @is_write: true - write, false - read + * + * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up + * with qemu_iovec_destroy(). + */ +static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, + size_t skip, size_t size, + bool is_write) +{ + QEMUIOVector elem; + struct iovec *iov; + unsigned int niov; + + pdu->s->transport->init_iov_from_pdu(pdu, &iov, &niov, is_write); + + qemu_iovec_init_external(&elem, iov, niov); + qemu_iovec_init(qiov, niov); + qemu_iovec_concat(qiov, &elem, skip, size); +} + static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, uint64_t off, uint32_t max_count) { ssize_t err; size_t offset = 7; uint64_t read_count; - V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); - VirtQueueElement *elem = v->elems[pdu->idx]; + QEMUIOVector qiov_full; if (fidp->fs.xattr.len < off) { read_count = 0; @@ -1656,9 +1681,11 @@ static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp, } offset += err; - err = v9fs_pack(elem->in_sg, elem->in_num, offset, + v9fs_init_qiov_from_pdu(&qiov_full, pdu, 0, read_count, false); + err = v9fs_pack(qiov_full.iov, qiov_full.niov, offset, ((char *)fidp->fs.xattr.value) + off, read_count); + qemu_iovec_destroy(&qiov_full); if (err < 0) { return err; } @@ -1732,32 +1759,6 @@ static int coroutine_fn v9fs_do_readdir_with_stat(V9fsPDU *pdu, return count; } -/* - * Create a QEMUIOVector for a sub-region of PDU iovecs - * - * @qiov: uninitialized QEMUIOVector - * @skip: number of bytes to skip from beginning of PDU - * @size: number of bytes to include - * @is_write: true - write, false - read - * - * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up - * with qemu_iovec_destroy(). - */ -static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu, - size_t skip, size_t size, - bool is_write) -{ - QEMUIOVector elem; - struct iovec *iov; - unsigned int niov; - - pdu->s->transport->init_iov_from_pdu(pdu, &iov, &niov, is_write); - - qemu_iovec_init_external(&elem, iov, niov); - qemu_iovec_init(qiov, niov); - qemu_iovec_concat(qiov, &elem, skip, size); -} - static void coroutine_fn v9fs_read(void *opaque) { int32_t fid;