From patchwork Sat Jan 12 17:58:03 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 1023940 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43cSPq4kNRz9s4s for ; Sun, 13 Jan 2019 05:07:42 +1100 (AEDT) Received: from localhost ([127.0.0.1]:49465 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1giNh4-0008BX-Lv for incoming@patchwork.ozlabs.org; Sat, 12 Jan 2019 13:07:38 -0500 Received: from eggs.gnu.org ([209.51.188.92]:59629) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1giNaN-0003XG-Hh for qemu-devel@nongnu.org; Sat, 12 Jan 2019 13:00:44 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1giNYS-0001ze-TK for qemu-devel@nongnu.org; Sat, 12 Jan 2019 12:58:46 -0500 Received: from mx1.redhat.com ([209.132.183.28]:52142) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1giNYL-0001j4-77; Sat, 12 Jan 2019 12:58:37 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 451C48667A; Sat, 12 Jan 2019 17:58:26 +0000 (UTC) Received: from blue.redhat.com (ovpn-116-216.phx2.redhat.com [10.3.116.216]) by smtp.corp.redhat.com (Postfix) with ESMTP id A97C46EE22; Sat, 12 Jan 2019 17:58:25 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Date: Sat, 12 Jan 2019 11:58:03 -0600 Message-Id: <20190112175812.27068-11-eblake@redhat.com> In-Reply-To: <20190112175812.27068-1-eblake@redhat.com> References: <20190112175812.27068-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Sat, 12 Jan 2019 17:58:26 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v3 10/19] nbd/client: Split out nbd_send_one_meta_context() 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: nsoffer@redhat.com, vsementsov@virtuozzo.com, jsnow@redhat.com, rjones@redhat.com, qemu-block@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Refactor nbd_negotiate_simple_meta_context() to pull out the code that can be reused to send a LIST request for 0 or 1 query. No semantic change. The old comment about 'sizeof(uint32_t)' being equivalent to '/* number of queries */' is no longer needed, now that we are computing 'sizeof(queries)' instead. Signed-off-by: Eric Blake Message-Id: <20181215135324.152629-14-eblake@redhat.com> Reviewed-by: Richard W.M. Jones Reviewed-by: Vladimir Sementsov-Ogievskiy --- v3: Improve commit message [Rich], formatting tweak [checkpatch], rebase to dropped patch --- nbd/client.c | 67 +++++++++++++++++++++++++++++++++--------------- nbd/trace-events | 2 +- 2 files changed, 48 insertions(+), 21 deletions(-) diff --git a/nbd/client.c b/nbd/client.c index 77993890f04..3c716be2719 100644 --- a/nbd/client.c +++ b/nbd/client.c @@ -629,6 +629,49 @@ static QIOChannel *nbd_receive_starttls(QIOChannel *ioc, return QIO_CHANNEL(tioc); } +/* + * nbd_send_one_meta_context: + * Send 0 or 1 set/list meta context queries. + * Return 0 on success, -1 with errp set for any error + */ +static int nbd_send_one_meta_context(QIOChannel *ioc, + uint32_t opt, + const char *export, + const char *query, + Error **errp) +{ + int ret; + uint32_t export_len = strlen(export); + uint32_t queries = !!query; + uint32_t context_len = 0; + uint32_t data_len; + char *data; + char *p; + + data_len = sizeof(export_len) + export_len + sizeof(queries); + if (query) { + context_len = strlen(query); + data_len += sizeof(context_len) + context_len; + } else { + assert(opt == NBD_OPT_LIST_META_CONTEXT); + } + data = g_malloc(data_len); + p = data; + + trace_nbd_opt_meta_request(nbd_opt_lookup(opt), query ?: "(all)", export); + stl_be_p(p, export_len); + memcpy(p += sizeof(export_len), export, export_len); + stl_be_p(p += export_len, queries); + if (query) { + stl_be_p(p += sizeof(uint32_t), context_len); + memcpy(p += sizeof(context_len), query, context_len); + } + + ret = nbd_send_option_request(ioc, opt, data_len, data, errp); + g_free(data); + return ret; +} + /* nbd_negotiate_simple_meta_context: * Request the server to set the meta context for export @info->name * using @info->x_dirty_bitmap with a fallback to "base:allocation", @@ -653,26 +696,10 @@ static int nbd_negotiate_simple_meta_context(QIOChannel *ioc, NBDOptionReply reply; const char *context = info->x_dirty_bitmap ?: "base:allocation"; bool received = false; - uint32_t export_len = strlen(info->name); - uint32_t context_len = strlen(context); - uint32_t data_len = sizeof(export_len) + export_len + - sizeof(uint32_t) + /* number of queries */ - sizeof(context_len) + context_len; - char *data = g_malloc(data_len); - char *p = data; - trace_nbd_opt_meta_request(context, info->name); - stl_be_p(p, export_len); - memcpy(p += sizeof(export_len), info->name, export_len); - stl_be_p(p += export_len, 1); - stl_be_p(p += sizeof(uint32_t), context_len); - memcpy(p += sizeof(context_len), context, context_len); - - ret = nbd_send_option_request(ioc, NBD_OPT_SET_META_CONTEXT, data_len, data, - errp); - g_free(data); - if (ret < 0) { - return ret; + if (nbd_send_one_meta_context(ioc, NBD_OPT_SET_META_CONTEXT, + info->name, context, errp) < 0) { + return -1; } if (nbd_receive_option_reply(ioc, NBD_OPT_SET_META_CONTEXT, &reply, @@ -689,7 +716,7 @@ static int nbd_negotiate_simple_meta_context(QIOChannel *ioc, if (reply.type == NBD_REP_META_CONTEXT) { char *name; - if (reply.length != sizeof(info->context_id) + context_len) { + if (reply.length != sizeof(info->context_id) + strlen(context)) { error_setg(errp, "Failed to negotiate meta context '%s', server " "answered with unexpected length %" PRIu32, context, reply.length); diff --git a/nbd/trace-events b/nbd/trace-events index c3966d2b653..59521e47a3d 100644 --- a/nbd/trace-events +++ b/nbd/trace-events @@ -12,7 +12,7 @@ nbd_receive_query_exports_start(const char *wantname) "Querying export list for nbd_receive_query_exports_success(const char *wantname) "Found desired export name '%s'" nbd_receive_starttls_new_client(void) "Setting up TLS" nbd_receive_starttls_tls_handshake(void) "Starting TLS handshake" -nbd_opt_meta_request(const char *context, const char *export) "Requesting to set meta context %s for export %s" +nbd_opt_meta_request(const char *optname, const char *context, const char *export) "Requesting %s %s for export %s" nbd_opt_meta_reply(const char *context, uint32_t id) "Received mapping of context %s to id %" PRIu32 nbd_receive_negotiate(void *tlscreds, const char *hostname) "Receiving negotiation tlscreds=%p hostname=%s" nbd_receive_negotiate_magic(uint64_t magic) "Magic is 0x%" PRIx64