In order to test that the NBD server is properly advertising dirty bitmaps, we need a bare minimum client that can request and read the context. Since feature freeze for 3.0 is imminent, this is the smallest workable patch, which replaces the qemu block status report with the results of the NBD server's dirty bitmap (making it very easy to use 'qemu-img map --output=json' to learn where the dirty portions are). Note that the NBD protocol defines a dirty section with the same bit but opposite sense that normal "base:allocation" uses to report an allocated section; so in qemu-img map output, "data":true corresponds to clean, "data":false corresponds to dirty. A more complete solution that allows dirty bitmaps to be queried at the same time as normal block status will be required before this addition can lose the x- prefix. Until then, the fact that this replaces normal status with dirty status means actions like 'qemu-img convert' will likely misbehave due to treating dirty regions of the file as if they are unallocated. The next patch adds an iotest to exercise this new code. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20180702191458.28741-2-eblake@redhat.com>
635 lines
19 KiB
C
635 lines
19 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 "nbd-client.h"
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#include "block/qdict.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 "qemu/option.h"
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#include "qapi/qapi-visit-sockets.h"
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#include "qapi/qobject-input-visitor.h"
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#include "qapi/qobject-output-visitor.h"
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#include "qapi/qmp/qdict.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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SocketAddress *saddr;
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char *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 (!g_strcmp0(uri->scheme, "nbd")) {
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is_unix = false;
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} else if (!g_strcmp0(uri->scheme, "nbd+tcp")) {
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is_unix = false;
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} else if (!g_strcmp0(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_str(options, "export", 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_str(options, "server.type", "unix");
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qdict_put_str(options, "server.path", qp->p[0].value);
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} else {
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QString *host;
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char *port_str;
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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_str(options, "server.type", "inet");
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qdict_put(options, "server.host", host);
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port_str = g_strdup_printf("%d", uri->port ?: NBD_DEFAULT_PORT);
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qdict_put_str(options, "server.port", port_str);
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g_free(port_str);
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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 bool nbd_has_filename_options_conflict(QDict *options, Error **errp)
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{
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const QDictEntry *e;
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for (e = qdict_first(options); e; e = qdict_next(options, e)) {
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if (!strcmp(e->key, "host") ||
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!strcmp(e->key, "port") ||
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!strcmp(e->key, "path") ||
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!strcmp(e->key, "export") ||
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strstart(e->key, "server.", NULL))
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{
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error_setg(errp, "Option '%s' cannot be used with a file name",
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e->key);
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return true;
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}
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}
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return false;
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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 (nbd_has_filename_options_conflict(options, errp)) {
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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_str(options, "export", 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_str(options, "server.type", "unix");
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qdict_put_str(options, "server.path", unixpath);
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} else {
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InetSocketAddress *addr = g_new(InetSocketAddress, 1);
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if (inet_parse(addr, host_spec, errp)) {
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goto out_inet;
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}
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qdict_put_str(options, "server.type", "inet");
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qdict_put_str(options, "server.host", addr->host);
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qdict_put_str(options, "server.port", addr->port);
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out_inet:
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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 bool nbd_process_legacy_socket_options(QDict *output_options,
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QemuOpts *legacy_opts,
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Error **errp)
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{
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const char *path = qemu_opt_get(legacy_opts, "path");
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const char *host = qemu_opt_get(legacy_opts, "host");
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const char *port = qemu_opt_get(legacy_opts, "port");
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const QDictEntry *e;
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if (!path && !host && !port) {
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return true;
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}
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for (e = qdict_first(output_options); e; e = qdict_next(output_options, e))
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{
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if (strstart(e->key, "server.", NULL)) {
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error_setg(errp, "Cannot use 'server' and path/host/port at the "
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"same time");
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return false;
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}
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}
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if (path && host) {
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error_setg(errp, "path and host may not be used at the same time");
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return false;
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} else if (path) {
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if (port) {
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error_setg(errp, "port may not be used without host");
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return false;
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}
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qdict_put_str(output_options, "server.type", "unix");
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qdict_put_str(output_options, "server.path", path);
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} else if (host) {
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qdict_put_str(output_options, "server.type", "inet");
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qdict_put_str(output_options, "server.host", host);
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qdict_put_str(output_options, "server.port",
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port ?: stringify(NBD_DEFAULT_PORT));
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}
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return true;
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}
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static SocketAddress *nbd_config(BDRVNBDState *s, QDict *options,
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Error **errp)
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{
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SocketAddress *saddr = NULL;
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QDict *addr = NULL;
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Visitor *iv = NULL;
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Error *local_err = NULL;
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qdict_extract_subqdict(options, &addr, "server.");
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if (!qdict_size(addr)) {
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error_setg(errp, "NBD server address missing");
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goto done;
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}
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iv = qobject_input_visitor_new_flat_confused(addr, errp);
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if (!iv) {
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goto done;
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}
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visit_type_SocketAddress(iv, NULL, &saddr, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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goto done;
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}
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done:
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qobject_unref(addr);
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visit_free(iv);
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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_set_name(QIO_CHANNEL(sioc), "nbd-client");
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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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object_unref(OBJECT(sioc));
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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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.name = "x-dirty-bitmap",
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.type = QEMU_OPT_STRING,
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.help = "experimental: expose named dirty bitmap in place of "
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"block status",
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},
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{ /* end of list */ }
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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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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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/* Translate @host, @port, and @path to a SocketAddress */
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if (!nbd_process_legacy_socket_options(options, opts, errp)) {
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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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s->saddr = nbd_config(s, options, errp);
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if (!s->saddr) {
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goto error;
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}
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s->export = g_strdup(qemu_opt_get(opts, "export"));
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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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/* TODO SOCKET_ADDRESS_KIND_FD where fd has AF_INET or AF_INET6 */
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if (s->saddr->type != SOCKET_ADDRESS_TYPE_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 = s->saddr->u.inet.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(s->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, tlscreds, hostname,
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qemu_opt_get(opts, "x-dirty-bitmap"), 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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qapi_free_SocketAddress(s->saddr);
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g_free(s->export);
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g_free(s->tlscredsid);
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}
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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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NBDClientSession *s = nbd_get_client_session(bs);
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uint32_t min = s->info.min_block;
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uint32_t max = MIN_NON_ZERO(NBD_MAX_BUFFER_SIZE, s->info.max_block);
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bs->bl.request_alignment = min ? min : BDRV_SECTOR_SIZE;
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bs->bl.max_pdiscard = max;
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bs->bl.max_pwrite_zeroes = max;
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bs->bl.max_transfer = max;
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if (s->info.opt_block &&
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s->info.opt_block > bs->bl.opt_transfer) {
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bs->bl.opt_transfer = s->info.opt_block;
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}
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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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qapi_free_SocketAddress(s->saddr);
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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.info.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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QObject *saddr_qdict;
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Visitor *ov;
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const char *host = NULL, *port = NULL, *path = NULL;
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if (s->saddr->type == SOCKET_ADDRESS_TYPE_INET) {
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const InetSocketAddress *inet = &s->saddr->u.inet;
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if (!inet->has_ipv4 && !inet->has_ipv6 && !inet->has_to) {
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host = inet->host;
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port = inet->port;
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}
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} else if (s->saddr->type == SOCKET_ADDRESS_TYPE_UNIX) {
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path = s->saddr->u.q_unix.path;
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} /* else can't represent as pseudo-filename */
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qdict_put_str(opts, "driver", "nbd");
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if (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, path);
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} else if (path && !s->export) {
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snprintf(bs->exact_filename, sizeof(bs->exact_filename),
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"nbd+unix://?socket=%s", path);
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} else if (host && s->export) {
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snprintf(bs->exact_filename, sizeof(bs->exact_filename),
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"nbd://%s:%s/%s", host, port, s->export);
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} else if (host && !s->export) {
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snprintf(bs->exact_filename, sizeof(bs->exact_filename),
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"nbd://%s:%s", host, port);
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}
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ov = qobject_output_visitor_new(&saddr_qdict);
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visit_type_SocketAddress(ov, NULL, &s->saddr, &error_abort);
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visit_complete(ov, &saddr_qdict);
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visit_free(ov);
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qdict_put_obj(opts, "server", saddr_qdict);
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if (s->export) {
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qdict_put_str(opts, "export", s->export);
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}
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if (s->tlscredsid) {
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qdict_put_str(opts, "tls-creds", s->tlscredsid);
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}
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qdict_flatten(opts);
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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_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes,
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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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.bdrv_co_block_status = nbd_client_co_block_status,
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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,
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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_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes,
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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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.bdrv_co_block_status = nbd_client_co_block_status,
|
|
};
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|
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static BlockDriver bdrv_nbd_unix = {
|
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.format_name = "nbd",
|
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.protocol_name = "nbd+unix",
|
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.instance_size = sizeof(BDRVNBDState),
|
|
.bdrv_parse_filename = nbd_parse_filename,
|
|
.bdrv_file_open = nbd_open,
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|
.bdrv_co_preadv = nbd_client_co_preadv,
|
|
.bdrv_co_pwritev = nbd_client_co_pwritev,
|
|
.bdrv_co_pwrite_zeroes = nbd_client_co_pwrite_zeroes,
|
|
.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,
|
|
.bdrv_co_block_status = nbd_client_co_block_status,
|
|
};
|
|
|
|
static void bdrv_nbd_init(void)
|
|
{
|
|
bdrv_register(&bdrv_nbd);
|
|
bdrv_register(&bdrv_nbd_tcp);
|
|
bdrv_register(&bdrv_nbd_unix);
|
|
}
|
|
|
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block_init(bdrv_nbd_init);
|