From nobody Sun Oct 5 19:22:56 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1543616130612848.5841290146149; Fri, 30 Nov 2018 14:15:30 -0800 (PST) Received: from localhost ([::1]:34881 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gSr4L-0007XT-Aj for importer@patchew.org; Fri, 30 Nov 2018 17:15:29 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56074) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gSqtO-0004Ru-2G for qemu-devel@nongnu.org; Fri, 30 Nov 2018 17:04:11 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gSqtJ-0004TZ-FL for qemu-devel@nongnu.org; Fri, 30 Nov 2018 17:04:09 -0500 Received: from mx1.redhat.com ([209.132.183.28]:34674) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gSqtE-0003xC-UH; Fri, 30 Nov 2018 17:04:01 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 45DAE3154849; Fri, 30 Nov 2018 22:04:00 +0000 (UTC) Received: from red.redhat.com (ovpn-117-105.phx2.redhat.com [10.3.117.105]) by smtp.corp.redhat.com (Postfix) with ESMTP id AED811057073; Fri, 30 Nov 2018 22:03:59 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Date: Fri, 30 Nov 2018 16:03:38 -0600 Message-Id: <20181130220344.3350618-10-eblake@redhat.com> In-Reply-To: <20181130220344.3350618-1-eblake@redhat.com> References: <20181130220344.3350618-1-eblake@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Fri, 30 Nov 2018 22:04:00 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 09/14] nbd/client: Refactor return of nbd_receive_negotiate() 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The function could only ever return 0 or -EINVAL; make this clearer by dropping a useless 'fail:' label. Signed-off-by: Eric Blake Reviewed-by: Richard W.M. Jones Reviewed-by: Vladimir Sementsov-Ogievskiy --- nbd/client.c | 51 +++++++++++++++++++++++---------------------------- 1 file changed, 23 insertions(+), 28 deletions(-) diff --git a/nbd/client.c b/nbd/client.c index 27785c55d0a..1ed5009642e 100644 --- a/nbd/client.c +++ b/nbd/client.c @@ -773,7 +773,6 @@ int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLSCr= eds *tlscreds, NBDExportInfo *info, Error **errp) { uint64_t magic; - int rc; bool zeroes =3D true; bool structured_reply =3D info->structured_reply; bool base_allocation =3D info->base_allocation; @@ -784,31 +783,30 @@ int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLS= Creds *tlscreds, trace_nbd_receive_negotiate_name(info->name); info->structured_reply =3D false; info->base_allocation =3D false; - rc =3D -EINVAL; if (outioc) { *outioc =3D NULL; } if (tlscreds && !outioc) { error_setg(errp, "Output I/O channel required for TLS"); - goto fail; + return -EINVAL; } if (nbd_read(ioc, &magic, sizeof(magic), errp) < 0) { error_prepend(errp, "Failed to read data: "); - goto fail; + return -EINVAL; } magic =3D be64_to_cpu(magic); trace_nbd_receive_negotiate_magic(magic); if (magic !=3D NBD_INIT_MAGIC) { error_setg(errp, "Invalid magic received"); - goto fail; + return -EINVAL; } if (nbd_read(ioc, &magic, sizeof(magic), errp) < 0) { error_prepend(errp, "Failed to read magic: "); - goto fail; + return -EINVAL; } magic =3D be64_to_cpu(magic); trace_nbd_receive_negotiate_magic(magic); @@ -820,7 +818,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLSCr= eds *tlscreds, if (nbd_read(ioc, &globalflags, sizeof(globalflags), errp) < 0) { error_prepend(errp, "Failed to read server flags: "); - goto fail; + return -EINVAL; } globalflags =3D be16_to_cpu(globalflags); trace_nbd_receive_negotiate_server_flags(globalflags); @@ -836,18 +834,18 @@ int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLS= Creds *tlscreds, clientflags =3D cpu_to_be32(clientflags); if (nbd_write(ioc, &clientflags, sizeof(clientflags), errp) < 0) { error_prepend(errp, "Failed to send clientflags field: "); - goto fail; + return -EINVAL; } if (tlscreds) { if (fixedNewStyle) { *outioc =3D nbd_receive_starttls(ioc, tlscreds, hostname, = errp); if (!*outioc) { - goto fail; + return -EINVAL; } ioc =3D *outioc; } else { error_setg(errp, "Server does not support STARTTLS"); - goto fail; + return -EINVAL; } } if (fixedNewStyle) { @@ -858,7 +856,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLSCr= eds *tlscreds, NBD_OPT_STRUCTURED_REPL= Y, errp); if (result < 0) { - goto fail; + return -EINVAL; } info->structured_reply =3D result =3D=3D 1; } @@ -869,7 +867,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLSCr= eds *tlscreds, info->x_dirty_bitmap ?: "base:allocation", info, errp); if (result < 0) { - goto fail; + return -EINVAL; } info->base_allocation =3D result =3D=3D 1; } @@ -881,7 +879,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLSCr= eds *tlscreds, * export, then use NBD_OPT_EXPORT_NAME. */ result =3D nbd_opt_go(ioc, info, errp); if (result < 0) { - goto fail; + return -EINVAL; } if (result > 0) { return 0; @@ -893,25 +891,25 @@ int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLS= Creds *tlscreds, * export name is not available. */ if (nbd_receive_query_exports(ioc, info->name, errp) < 0) { - goto fail; + return -EINVAL; } } /* write the export name request */ if (nbd_send_option_request(ioc, NBD_OPT_EXPORT_NAME, -1, info->na= me, errp) < 0) { - goto fail; + return -EINVAL; } /* Read the response */ if (nbd_read(ioc, &info->size, sizeof(info->size), errp) < 0) { error_prepend(errp, "Failed to read export length: "); - goto fail; + return -EINVAL; } info->size =3D be64_to_cpu(info->size); if (nbd_read(ioc, &info->flags, sizeof(info->flags), errp) < 0) { error_prepend(errp, "Failed to read export flags: "); - goto fail; + return -EINVAL; } info->flags =3D be16_to_cpu(info->flags); } else if (magic =3D=3D NBD_CLIENT_MAGIC) { @@ -919,43 +917,40 @@ int nbd_receive_negotiate(QIOChannel *ioc, QCryptoTLS= Creds *tlscreds, if (*info->name) { error_setg(errp, "Server does not support non-empty export nam= es"); - goto fail; + return -EINVAL; } if (tlscreds) { error_setg(errp, "Server does not support STARTTLS"); - goto fail; + return -EINVAL; } if (nbd_read(ioc, &info->size, sizeof(info->size), errp) < 0) { error_prepend(errp, "Failed to read export length: "); - goto fail; + return -EINVAL; } info->size =3D be64_to_cpu(info->size); if (nbd_read(ioc, &oldflags, sizeof(oldflags), errp) < 0) { error_prepend(errp, "Failed to read export flags: "); - goto fail; + return -EINVAL; } oldflags =3D be32_to_cpu(oldflags); if (oldflags & ~0xffff) { error_setg(errp, "Unexpected export flags %0x" PRIx32, oldflag= s); - goto fail; + return -EINVAL; } info->flags =3D oldflags; } else { error_setg(errp, "Bad magic received"); - goto fail; + return -EINVAL; } trace_nbd_receive_negotiate_size_flags(info->size, info->flags); if (zeroes && nbd_drop(ioc, 124, errp) < 0) { error_prepend(errp, "Failed to read reserved block: "); - goto fail; + return -EINVAL; } - rc =3D 0; - -fail: - return rc; + return 0; } #ifdef __linux__ --=20 2.17.2