680 lines
18 KiB
C
680 lines
18 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-common.h"
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#include "block/nbd.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/sockets.h"
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#include "qapi/qmp/qjson.h"
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#include "qapi/qmp/qint.h"
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#include <sys/types.h>
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#include <unistd.h>
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#define EN_OPTSTR ":exportname="
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/* #define DEBUG_NBD */
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#if defined(DEBUG_NBD)
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#define logout(fmt, ...) \
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fprintf(stderr, "nbd\t%-24s" fmt, __func__, ##__VA_ARGS__)
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#else
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#define logout(fmt, ...) ((void)0)
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#endif
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#define MAX_NBD_REQUESTS 16
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#define HANDLE_TO_INDEX(bs, handle) ((handle) ^ ((uint64_t)(intptr_t)bs))
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#define INDEX_TO_HANDLE(bs, index) ((index) ^ ((uint64_t)(intptr_t)bs))
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typedef struct BDRVNBDState {
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int sock;
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uint32_t nbdflags;
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off_t size;
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size_t blocksize;
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CoMutex send_mutex;
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CoMutex free_sema;
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Coroutine *send_coroutine;
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int in_flight;
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Coroutine *recv_coroutine[MAX_NBD_REQUESTS];
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struct nbd_reply reply;
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bool is_unix;
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QemuOpts *socket_opts;
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char *export_name; /* An NBD server may export several devices */
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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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/* 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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qdict_put(options, "host", qstring_from_str(uri->server));
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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 (error_is_set(errp)) {
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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 int nbd_config(BDRVNBDState *s, QDict *options)
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{
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Error *local_err = NULL;
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if (qdict_haskey(options, "path")) {
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if (qdict_haskey(options, "host")) {
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qerror_report(ERROR_CLASS_GENERIC_ERROR, "path and host may not "
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"be used at the same time.");
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return -EINVAL;
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}
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s->is_unix = true;
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} else if (qdict_haskey(options, "host")) {
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s->is_unix = false;
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} else {
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return -EINVAL;
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}
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s->socket_opts = qemu_opts_create_nofail(&socket_optslist);
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qemu_opts_absorb_qdict(s->socket_opts, options, &local_err);
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if (error_is_set(&local_err)) {
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qerror_report_err(local_err);
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error_free(local_err);
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return -EINVAL;
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}
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if (!qemu_opt_get(s->socket_opts, "port")) {
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qemu_opt_set_number(s->socket_opts, "port", NBD_DEFAULT_PORT);
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}
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s->export_name = g_strdup(qdict_get_try_str(options, "export"));
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if (s->export_name) {
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qdict_del(options, "export");
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}
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return 0;
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}
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static void nbd_coroutine_start(BDRVNBDState *s, struct nbd_request *request)
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{
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int i;
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/* Poor man semaphore. The free_sema is locked when no other request
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* can be accepted, and unlocked after receiving one reply. */
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if (s->in_flight >= MAX_NBD_REQUESTS - 1) {
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qemu_co_mutex_lock(&s->free_sema);
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assert(s->in_flight < MAX_NBD_REQUESTS);
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}
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s->in_flight++;
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for (i = 0; i < MAX_NBD_REQUESTS; i++) {
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if (s->recv_coroutine[i] == NULL) {
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s->recv_coroutine[i] = qemu_coroutine_self();
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break;
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}
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}
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assert(i < MAX_NBD_REQUESTS);
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request->handle = INDEX_TO_HANDLE(s, i);
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}
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static int nbd_have_request(void *opaque)
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{
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BDRVNBDState *s = opaque;
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return s->in_flight > 0;
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}
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static void nbd_reply_ready(void *opaque)
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{
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BDRVNBDState *s = opaque;
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uint64_t i;
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int ret;
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if (s->reply.handle == 0) {
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/* No reply already in flight. Fetch a header. It is possible
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* that another thread has done the same thing in parallel, so
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* the socket is not readable anymore.
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*/
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ret = nbd_receive_reply(s->sock, &s->reply);
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if (ret == -EAGAIN) {
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return;
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}
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if (ret < 0) {
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s->reply.handle = 0;
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goto fail;
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}
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}
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/* There's no need for a mutex on the receive side, because the
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* handler acts as a synchronization point and ensures that only
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* one coroutine is called until the reply finishes. */
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i = HANDLE_TO_INDEX(s, s->reply.handle);
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if (i >= MAX_NBD_REQUESTS) {
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goto fail;
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}
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if (s->recv_coroutine[i]) {
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qemu_coroutine_enter(s->recv_coroutine[i], NULL);
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return;
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}
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fail:
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for (i = 0; i < MAX_NBD_REQUESTS; i++) {
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if (s->recv_coroutine[i]) {
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qemu_coroutine_enter(s->recv_coroutine[i], NULL);
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}
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}
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}
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static void nbd_restart_write(void *opaque)
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{
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BDRVNBDState *s = opaque;
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qemu_coroutine_enter(s->send_coroutine, NULL);
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}
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static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request,
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QEMUIOVector *qiov, int offset)
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{
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int rc, ret;
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qemu_co_mutex_lock(&s->send_mutex);
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s->send_coroutine = qemu_coroutine_self();
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qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, nbd_restart_write,
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nbd_have_request, s);
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rc = nbd_send_request(s->sock, request);
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if (rc >= 0 && qiov) {
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ret = qemu_co_sendv(s->sock, qiov->iov, qiov->niov,
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offset, request->len);
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if (ret != request->len) {
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return -EIO;
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}
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}
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qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, NULL,
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nbd_have_request, s);
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s->send_coroutine = NULL;
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qemu_co_mutex_unlock(&s->send_mutex);
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return rc;
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}
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static void nbd_co_receive_reply(BDRVNBDState *s, struct nbd_request *request,
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struct nbd_reply *reply,
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QEMUIOVector *qiov, int offset)
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{
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int ret;
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/* Wait until we're woken up by the read handler. TODO: perhaps
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* peek at the next reply and avoid yielding if it's ours? */
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qemu_coroutine_yield();
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*reply = s->reply;
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if (reply->handle != request->handle) {
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reply->error = EIO;
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} else {
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if (qiov && reply->error == 0) {
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ret = qemu_co_recvv(s->sock, qiov->iov, qiov->niov,
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offset, request->len);
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if (ret != request->len) {
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reply->error = EIO;
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}
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}
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/* Tell the read handler to read another header. */
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s->reply.handle = 0;
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}
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}
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static void nbd_coroutine_end(BDRVNBDState *s, struct nbd_request *request)
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{
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int i = HANDLE_TO_INDEX(s, request->handle);
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s->recv_coroutine[i] = NULL;
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if (s->in_flight-- == MAX_NBD_REQUESTS) {
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qemu_co_mutex_unlock(&s->free_sema);
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}
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}
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static int nbd_establish_connection(BlockDriverState *bs)
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{
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BDRVNBDState *s = bs->opaque;
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int sock;
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int ret;
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off_t size;
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size_t blocksize;
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if (s->is_unix) {
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sock = unix_socket_outgoing(qemu_opt_get(s->socket_opts, "path"));
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} else {
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sock = tcp_socket_outgoing_opts(s->socket_opts);
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}
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/* Failed to establish connection */
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if (sock < 0) {
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logout("Failed to establish connection to NBD server\n");
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return -errno;
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}
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/* NBD handshake */
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ret = nbd_receive_negotiate(sock, s->export_name, &s->nbdflags, &size,
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&blocksize);
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if (ret < 0) {
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logout("Failed to negotiate with the NBD server\n");
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closesocket(sock);
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return ret;
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}
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/* Now that we're connected, set the socket to be non-blocking and
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* kick the reply mechanism. */
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socket_set_nonblock(sock);
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qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL,
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nbd_have_request, s);
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s->sock = sock;
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s->size = size;
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s->blocksize = blocksize;
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logout("Established connection with NBD server\n");
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return 0;
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}
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static void nbd_teardown_connection(BlockDriverState *bs)
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{
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BDRVNBDState *s = bs->opaque;
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struct nbd_request request;
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request.type = NBD_CMD_DISC;
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request.from = 0;
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request.len = 0;
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nbd_send_request(s->sock, &request);
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qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL, NULL);
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closesocket(s->sock);
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}
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static int nbd_open(BlockDriverState *bs, const char* filename,
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QDict *options, int flags)
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{
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BDRVNBDState *s = bs->opaque;
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int result;
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qemu_co_mutex_init(&s->send_mutex);
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qemu_co_mutex_init(&s->free_sema);
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/* Pop the config into our state object. Exit if invalid. */
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result = nbd_config(s, options);
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if (result != 0) {
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return result;
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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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result = nbd_establish_connection(bs);
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return result;
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}
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static int nbd_co_readv_1(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov,
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int offset)
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{
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BDRVNBDState *s = bs->opaque;
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struct nbd_request request;
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struct nbd_reply reply;
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ssize_t ret;
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request.type = NBD_CMD_READ;
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request.from = sector_num * 512;
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request.len = nb_sectors * 512;
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nbd_coroutine_start(s, &request);
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ret = nbd_co_send_request(s, &request, NULL, 0);
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if (ret < 0) {
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reply.error = -ret;
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} else {
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nbd_co_receive_reply(s, &request, &reply, qiov, offset);
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}
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nbd_coroutine_end(s, &request);
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return -reply.error;
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}
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static int nbd_co_writev_1(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov,
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int offset)
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{
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BDRVNBDState *s = bs->opaque;
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struct nbd_request request;
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struct nbd_reply reply;
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ssize_t ret;
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request.type = NBD_CMD_WRITE;
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if (!bdrv_enable_write_cache(bs) && (s->nbdflags & NBD_FLAG_SEND_FUA)) {
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request.type |= NBD_CMD_FLAG_FUA;
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}
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request.from = sector_num * 512;
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request.len = nb_sectors * 512;
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nbd_coroutine_start(s, &request);
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ret = nbd_co_send_request(s, &request, qiov, offset);
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if (ret < 0) {
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reply.error = -ret;
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} else {
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nbd_co_receive_reply(s, &request, &reply, NULL, 0);
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}
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nbd_coroutine_end(s, &request);
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return -reply.error;
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}
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/* qemu-nbd has a limit of slightly less than 1M per request. Try to
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* remain aligned to 4K. */
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#define NBD_MAX_SECTORS 2040
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static int nbd_co_readv(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov)
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{
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int offset = 0;
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int ret;
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while (nb_sectors > NBD_MAX_SECTORS) {
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ret = nbd_co_readv_1(bs, sector_num, NBD_MAX_SECTORS, qiov, offset);
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if (ret < 0) {
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return ret;
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}
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offset += NBD_MAX_SECTORS * 512;
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sector_num += NBD_MAX_SECTORS;
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nb_sectors -= NBD_MAX_SECTORS;
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}
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return nbd_co_readv_1(bs, sector_num, nb_sectors, qiov, offset);
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}
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static int nbd_co_writev(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov)
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{
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int offset = 0;
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int ret;
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while (nb_sectors > NBD_MAX_SECTORS) {
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ret = nbd_co_writev_1(bs, sector_num, NBD_MAX_SECTORS, qiov, offset);
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if (ret < 0) {
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return ret;
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}
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offset += NBD_MAX_SECTORS * 512;
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sector_num += NBD_MAX_SECTORS;
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nb_sectors -= NBD_MAX_SECTORS;
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}
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return nbd_co_writev_1(bs, sector_num, nb_sectors, qiov, offset);
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}
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static int nbd_co_flush(BlockDriverState *bs)
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{
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BDRVNBDState *s = bs->opaque;
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struct nbd_request request;
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struct nbd_reply reply;
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ssize_t ret;
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if (!(s->nbdflags & NBD_FLAG_SEND_FLUSH)) {
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return 0;
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}
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request.type = NBD_CMD_FLUSH;
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if (s->nbdflags & NBD_FLAG_SEND_FUA) {
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request.type |= NBD_CMD_FLAG_FUA;
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}
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request.from = 0;
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request.len = 0;
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nbd_coroutine_start(s, &request);
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ret = nbd_co_send_request(s, &request, NULL, 0);
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if (ret < 0) {
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reply.error = -ret;
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} else {
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nbd_co_receive_reply(s, &request, &reply, NULL, 0);
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}
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nbd_coroutine_end(s, &request);
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return -reply.error;
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}
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static int nbd_co_discard(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors)
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{
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BDRVNBDState *s = bs->opaque;
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struct nbd_request request;
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struct nbd_reply reply;
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ssize_t ret;
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if (!(s->nbdflags & NBD_FLAG_SEND_TRIM)) {
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return 0;
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}
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request.type = NBD_CMD_TRIM;
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request.from = sector_num * 512;;
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request.len = nb_sectors * 512;
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nbd_coroutine_start(s, &request);
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ret = nbd_co_send_request(s, &request, NULL, 0);
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if (ret < 0) {
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reply.error = -ret;
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} else {
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nbd_co_receive_reply(s, &request, &reply, NULL, 0);
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}
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nbd_coroutine_end(s, &request);
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return -reply.error;
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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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g_free(s->export_name);
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qemu_opts_del(s->socket_opts);
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nbd_teardown_connection(bs);
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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->size;
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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_readv = nbd_co_readv,
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.bdrv_co_writev = nbd_co_writev,
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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_discard = nbd_co_discard,
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.bdrv_getlength = nbd_getlength,
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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_readv = nbd_co_readv,
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.bdrv_co_writev = nbd_co_writev,
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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_discard = nbd_co_discard,
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.bdrv_getlength = nbd_getlength,
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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),
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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_readv = nbd_co_readv,
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.bdrv_co_writev = nbd_co_writev,
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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_discard = nbd_co_discard,
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.bdrv_getlength = nbd_getlength,
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};
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static void bdrv_nbd_init(void)
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{
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bdrv_register(&bdrv_nbd);
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bdrv_register(&bdrv_nbd_tcp);
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bdrv_register(&bdrv_nbd_unix);
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}
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block_init(bdrv_nbd_init);
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