mirror of https://gitee.com/openkylin/qemu.git
548 lines
16 KiB
C
548 lines
16 KiB
C
/*
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* QEMU Block driver for NBD
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*
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* Copyright (C) 2008 Bull S.A.S.
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* Author: Laurent Vivier <Laurent.Vivier@bull.net>
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*
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* Some parts:
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* Copyright (C) 2007 Anthony Liguori <anthony@codemonkey.ws>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "block/nbd-client.h"
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#include "qapi/error.h"
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#include "qemu/uri.h"
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#include "block/block_int.h"
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#include "qemu/module.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qjson.h"
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#include "qapi/qmp/qint.h"
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#include "qapi/qmp/qstring.h"
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#include "qemu/cutils.h"
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#define EN_OPTSTR ":exportname="
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typedef struct BDRVNBDState {
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NbdClientSession client;
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/* For nbd_refresh_filename() */
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char *path, *host, *port, *export, *tlscredsid;
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} BDRVNBDState;
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static int nbd_parse_uri(const char *filename, QDict *options)
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{
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URI *uri;
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const char *p;
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QueryParams *qp = NULL;
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int ret = 0;
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bool is_unix;
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uri = uri_parse(filename);
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if (!uri) {
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return -EINVAL;
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}
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/* transport */
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if (!strcmp(uri->scheme, "nbd")) {
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is_unix = false;
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} else if (!strcmp(uri->scheme, "nbd+tcp")) {
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is_unix = false;
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} else if (!strcmp(uri->scheme, "nbd+unix")) {
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is_unix = true;
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} else {
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ret = -EINVAL;
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goto out;
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}
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p = uri->path ? uri->path : "/";
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p += strspn(p, "/");
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if (p[0]) {
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qdict_put(options, "export", qstring_from_str(p));
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}
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qp = query_params_parse(uri->query);
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if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) {
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ret = -EINVAL;
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goto out;
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}
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if (is_unix) {
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/* nbd+unix:///export?socket=path */
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if (uri->server || uri->port || strcmp(qp->p[0].name, "socket")) {
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ret = -EINVAL;
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goto out;
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}
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qdict_put(options, "path", qstring_from_str(qp->p[0].value));
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} else {
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QString *host;
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/* nbd[+tcp]://host[:port]/export */
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if (!uri->server) {
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ret = -EINVAL;
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goto out;
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}
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/* strip braces from literal IPv6 address */
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if (uri->server[0] == '[') {
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host = qstring_from_substr(uri->server, 1,
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strlen(uri->server) - 2);
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} else {
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host = qstring_from_str(uri->server);
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}
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qdict_put(options, "host", host);
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if (uri->port) {
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char* port_str = g_strdup_printf("%d", uri->port);
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qdict_put(options, "port", qstring_from_str(port_str));
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g_free(port_str);
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}
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}
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out:
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if (qp) {
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query_params_free(qp);
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}
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uri_free(uri);
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return ret;
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}
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static void nbd_parse_filename(const char *filename, QDict *options,
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Error **errp)
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{
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char *file;
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char *export_name;
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const char *host_spec;
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const char *unixpath;
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if (qdict_haskey(options, "host")
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|| qdict_haskey(options, "port")
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|| qdict_haskey(options, "path"))
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{
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error_setg(errp, "host/port/path and a file name may not be specified "
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"at the same time");
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return;
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}
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if (strstr(filename, "://")) {
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int ret = nbd_parse_uri(filename, options);
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if (ret < 0) {
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error_setg(errp, "No valid URL specified");
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}
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return;
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}
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file = g_strdup(filename);
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export_name = strstr(file, EN_OPTSTR);
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if (export_name) {
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if (export_name[strlen(EN_OPTSTR)] == 0) {
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goto out;
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}
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export_name[0] = 0; /* truncate 'file' */
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export_name += strlen(EN_OPTSTR);
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qdict_put(options, "export", qstring_from_str(export_name));
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}
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/* extract the host_spec - fail if it's not nbd:... */
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if (!strstart(file, "nbd:", &host_spec)) {
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error_setg(errp, "File name string for NBD must start with 'nbd:'");
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goto out;
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}
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if (!*host_spec) {
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goto out;
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}
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/* are we a UNIX or TCP socket? */
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if (strstart(host_spec, "unix:", &unixpath)) {
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qdict_put(options, "path", qstring_from_str(unixpath));
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} else {
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InetSocketAddress *addr = NULL;
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addr = inet_parse(host_spec, errp);
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if (!addr) {
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goto out;
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}
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qdict_put(options, "host", qstring_from_str(addr->host));
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qdict_put(options, "port", qstring_from_str(addr->port));
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qapi_free_InetSocketAddress(addr);
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}
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out:
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g_free(file);
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}
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static SocketAddress *nbd_config(BDRVNBDState *s, QemuOpts *opts, Error **errp)
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{
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SocketAddress *saddr;
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s->path = g_strdup(qemu_opt_get(opts, "path"));
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s->host = g_strdup(qemu_opt_get(opts, "host"));
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if (!s->path == !s->host) {
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if (s->path) {
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error_setg(errp, "path and host may not be used at the same time.");
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} else {
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error_setg(errp, "one of path and host must be specified.");
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}
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return NULL;
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}
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saddr = g_new0(SocketAddress, 1);
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if (s->path) {
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UnixSocketAddress *q_unix;
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saddr->type = SOCKET_ADDRESS_KIND_UNIX;
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q_unix = saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
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q_unix->path = g_strdup(s->path);
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} else {
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InetSocketAddress *inet;
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s->port = g_strdup(qemu_opt_get(opts, "port"));
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saddr->type = SOCKET_ADDRESS_KIND_INET;
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inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1);
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inet->host = g_strdup(s->host);
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inet->port = g_strdup(s->port);
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if (!inet->port) {
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inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
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}
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}
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s->client.is_unix = saddr->type == SOCKET_ADDRESS_KIND_UNIX;
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s->export = g_strdup(qemu_opt_get(opts, "export"));
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return saddr;
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}
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NbdClientSession *nbd_get_client_session(BlockDriverState *bs)
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{
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BDRVNBDState *s = bs->opaque;
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return &s->client;
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}
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static QIOChannelSocket *nbd_establish_connection(SocketAddress *saddr,
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Error **errp)
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{
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QIOChannelSocket *sioc;
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Error *local_err = NULL;
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sioc = qio_channel_socket_new();
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qio_channel_socket_connect_sync(sioc,
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saddr,
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&local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return NULL;
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}
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qio_channel_set_delay(QIO_CHANNEL(sioc), false);
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return sioc;
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}
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static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
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{
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Object *obj;
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QCryptoTLSCreds *creds;
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obj = object_resolve_path_component(
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object_get_objects_root(), id);
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if (!obj) {
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error_setg(errp, "No TLS credentials with id '%s'",
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id);
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return NULL;
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}
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creds = (QCryptoTLSCreds *)
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object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
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if (!creds) {
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error_setg(errp, "Object with id '%s' is not TLS credentials",
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id);
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return NULL;
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}
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if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
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error_setg(errp,
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"Expecting TLS credentials with a client endpoint");
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return NULL;
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}
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object_ref(obj);
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return creds;
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}
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static QemuOptsList nbd_runtime_opts = {
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.name = "nbd",
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.head = QTAILQ_HEAD_INITIALIZER(nbd_runtime_opts.head),
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.desc = {
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{
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.name = "host",
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.type = QEMU_OPT_STRING,
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.help = "TCP host to connect to",
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},
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{
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.name = "port",
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.type = QEMU_OPT_STRING,
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.help = "TCP port to connect to",
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},
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{
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.name = "path",
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.type = QEMU_OPT_STRING,
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.help = "Unix socket path to connect to",
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},
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{
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.name = "export",
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.type = QEMU_OPT_STRING,
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.help = "Name of the NBD export to open",
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},
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{
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.name = "tls-creds",
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.type = QEMU_OPT_STRING,
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.help = "ID of the TLS credentials to use",
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},
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},
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};
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static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
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Error **errp)
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{
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BDRVNBDState *s = bs->opaque;
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QemuOpts *opts = NULL;
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Error *local_err = NULL;
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QIOChannelSocket *sioc = NULL;
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SocketAddress *saddr = NULL;
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QCryptoTLSCreds *tlscreds = NULL;
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const char *hostname = NULL;
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int ret = -EINVAL;
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opts = qemu_opts_create(&nbd_runtime_opts, NULL, 0, &error_abort);
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qemu_opts_absorb_qdict(opts, options, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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goto error;
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}
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/* Pop the config into our state object. Exit if invalid. */
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saddr = nbd_config(s, opts, errp);
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if (!saddr) {
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goto error;
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}
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s->tlscredsid = g_strdup(qemu_opt_get(opts, "tls-creds"));
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if (s->tlscredsid) {
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tlscreds = nbd_get_tls_creds(s->tlscredsid, errp);
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if (!tlscreds) {
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goto error;
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}
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if (saddr->type != SOCKET_ADDRESS_KIND_INET) {
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error_setg(errp, "TLS only supported over IP sockets");
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goto error;
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}
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hostname = saddr->u.inet.data->host;
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}
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/* establish TCP connection, return error if it fails
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* TODO: Configurable retry-until-timeout behaviour.
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*/
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sioc = nbd_establish_connection(saddr, errp);
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if (!sioc) {
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ret = -ECONNREFUSED;
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goto error;
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}
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/* NBD handshake */
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ret = nbd_client_init(bs, sioc, s->export,
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tlscreds, hostname, errp);
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error:
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if (sioc) {
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object_unref(OBJECT(sioc));
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}
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if (tlscreds) {
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object_unref(OBJECT(tlscreds));
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}
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if (ret < 0) {
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g_free(s->path);
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g_free(s->host);
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g_free(s->port);
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g_free(s->export);
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g_free(s->tlscredsid);
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}
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qapi_free_SocketAddress(saddr);
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qemu_opts_del(opts);
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return ret;
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}
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static int nbd_co_flush(BlockDriverState *bs)
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{
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return nbd_client_co_flush(bs);
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}
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static void nbd_refresh_limits(BlockDriverState *bs, Error **errp)
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{
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bs->bl.max_pdiscard = NBD_MAX_BUFFER_SIZE;
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bs->bl.max_transfer = NBD_MAX_BUFFER_SIZE;
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}
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static void nbd_close(BlockDriverState *bs)
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{
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BDRVNBDState *s = bs->opaque;
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nbd_client_close(bs);
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g_free(s->path);
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g_free(s->host);
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g_free(s->port);
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g_free(s->export);
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g_free(s->tlscredsid);
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}
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static int64_t nbd_getlength(BlockDriverState *bs)
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{
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BDRVNBDState *s = bs->opaque;
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return s->client.size;
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}
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static void nbd_detach_aio_context(BlockDriverState *bs)
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{
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nbd_client_detach_aio_context(bs);
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}
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static void nbd_attach_aio_context(BlockDriverState *bs,
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AioContext *new_context)
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{
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nbd_client_attach_aio_context(bs, new_context);
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}
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static void nbd_refresh_filename(BlockDriverState *bs, QDict *options)
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{
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BDRVNBDState *s = bs->opaque;
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QDict *opts = qdict_new();
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qdict_put_obj(opts, "driver", QOBJECT(qstring_from_str("nbd")));
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if (s->path && s->export) {
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snprintf(bs->exact_filename, sizeof(bs->exact_filename),
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"nbd+unix:///%s?socket=%s", s->export, s->path);
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} else if (s->path && !s->export) {
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snprintf(bs->exact_filename, sizeof(bs->exact_filename),
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"nbd+unix://?socket=%s", s->path);
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} else if (!s->path && s->export && s->port) {
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snprintf(bs->exact_filename, sizeof(bs->exact_filename),
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"nbd://%s:%s/%s", s->host, s->port, s->export);
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} else if (!s->path && s->export && !s->port) {
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snprintf(bs->exact_filename, sizeof(bs->exact_filename),
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"nbd://%s/%s", s->host, s->export);
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} else if (!s->path && !s->export && s->port) {
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snprintf(bs->exact_filename, sizeof(bs->exact_filename),
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"nbd://%s:%s", s->host, s->port);
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} else if (!s->path && !s->export && !s->port) {
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snprintf(bs->exact_filename, sizeof(bs->exact_filename),
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"nbd://%s", s->host);
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}
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if (s->path) {
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qdict_put_obj(opts, "path", QOBJECT(qstring_from_str(s->path)));
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} else if (s->port) {
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qdict_put_obj(opts, "host", QOBJECT(qstring_from_str(s->host)));
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qdict_put_obj(opts, "port", QOBJECT(qstring_from_str(s->port)));
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} else {
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qdict_put_obj(opts, "host", QOBJECT(qstring_from_str(s->host)));
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}
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if (s->export) {
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qdict_put_obj(opts, "export", QOBJECT(qstring_from_str(s->export)));
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}
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if (s->tlscredsid) {
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qdict_put_obj(opts, "tls-creds",
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QOBJECT(qstring_from_str(s->tlscredsid)));
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}
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bs->full_open_options = opts;
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}
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static BlockDriver bdrv_nbd = {
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.format_name = "nbd",
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.protocol_name = "nbd",
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.instance_size = sizeof(BDRVNBDState),
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.bdrv_parse_filename = nbd_parse_filename,
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.bdrv_file_open = nbd_open,
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.bdrv_co_preadv = nbd_client_co_preadv,
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.bdrv_co_pwritev = nbd_client_co_pwritev,
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.bdrv_close = nbd_close,
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.bdrv_co_flush_to_os = nbd_co_flush,
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.bdrv_co_pdiscard = nbd_client_co_pdiscard,
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.bdrv_refresh_limits = nbd_refresh_limits,
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.bdrv_getlength = nbd_getlength,
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.bdrv_detach_aio_context = nbd_detach_aio_context,
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.bdrv_attach_aio_context = nbd_attach_aio_context,
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.bdrv_refresh_filename = nbd_refresh_filename,
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};
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static BlockDriver bdrv_nbd_tcp = {
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.format_name = "nbd",
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.protocol_name = "nbd+tcp",
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.instance_size = sizeof(BDRVNBDState),
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.bdrv_parse_filename = nbd_parse_filename,
|
|
.bdrv_file_open = nbd_open,
|
|
.bdrv_co_preadv = nbd_client_co_preadv,
|
|
.bdrv_co_pwritev = nbd_client_co_pwritev,
|
|
.bdrv_close = nbd_close,
|
|
.bdrv_co_flush_to_os = nbd_co_flush,
|
|
.bdrv_co_pdiscard = nbd_client_co_pdiscard,
|
|
.bdrv_refresh_limits = nbd_refresh_limits,
|
|
.bdrv_getlength = nbd_getlength,
|
|
.bdrv_detach_aio_context = nbd_detach_aio_context,
|
|
.bdrv_attach_aio_context = nbd_attach_aio_context,
|
|
.bdrv_refresh_filename = nbd_refresh_filename,
|
|
};
|
|
|
|
static BlockDriver bdrv_nbd_unix = {
|
|
.format_name = "nbd",
|
|
.protocol_name = "nbd+unix",
|
|
.instance_size = sizeof(BDRVNBDState),
|
|
.bdrv_parse_filename = nbd_parse_filename,
|
|
.bdrv_file_open = nbd_open,
|
|
.bdrv_co_preadv = nbd_client_co_preadv,
|
|
.bdrv_co_pwritev = nbd_client_co_pwritev,
|
|
.bdrv_close = nbd_close,
|
|
.bdrv_co_flush_to_os = nbd_co_flush,
|
|
.bdrv_co_pdiscard = nbd_client_co_pdiscard,
|
|
.bdrv_refresh_limits = nbd_refresh_limits,
|
|
.bdrv_getlength = nbd_getlength,
|
|
.bdrv_detach_aio_context = nbd_detach_aio_context,
|
|
.bdrv_attach_aio_context = nbd_attach_aio_context,
|
|
.bdrv_refresh_filename = nbd_refresh_filename,
|
|
};
|
|
|
|
static void bdrv_nbd_init(void)
|
|
{
|
|
bdrv_register(&bdrv_nbd);
|
|
bdrv_register(&bdrv_nbd_tcp);
|
|
bdrv_register(&bdrv_nbd_unix);
|
|
}
|
|
|
|
block_init(bdrv_nbd_init);
|