From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57670) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cOgpx-0006xx-2Q for qemu-devel@nongnu.org; Wed, 04 Jan 2017 03:22:22 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cOgpt-00007t-U1 for qemu-devel@nongnu.org; Wed, 04 Jan 2017 03:22:21 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:43907) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cOgpt-00007I-K2 for qemu-devel@nongnu.org; Wed, 04 Jan 2017 03:22:17 -0500 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id v048J5gx089316 for ; Wed, 4 Jan 2017 03:22:16 -0500 Received: from e06smtp09.uk.ibm.com (e06smtp09.uk.ibm.com [195.75.94.105]) by mx0a-001b2d01.pphosted.com with ESMTP id 27rmq81w55-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 04 Jan 2017 03:22:16 -0500 Received: from localhost by e06smtp09.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 4 Jan 2017 08:22:13 -0000 From: Greg Kurz Date: Wed, 4 Jan 2017 09:21:37 +0100 In-Reply-To: <1483518107-13218-1-git-send-email-groug@kaod.org> References: <1483518107-13218-1-git-send-email-groug@kaod.org> Message-Id: <1483518107-13218-4-git-send-email-groug@kaod.org> Subject: [Qemu-devel] [PULL 03/13] 9pfs: call v9fs_init_qiov_from_pdu before v9fs_pack List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Maydell , "Aneesh Kumar K.V" , Greg Kurz , Stefano Stabellini From: Stefano Stabellini 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 Signed-off-by: Greg Kurz --- 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 3f5647aa5680..f9acd632596f 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; -- 2.7.4