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/*
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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 "nbd.h" |
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#include "uri.h" |
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#include "block_int.h" |
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#include "module.h" |
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#include "qemu_socket.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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|
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/* #define DEBUG_NBD */
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|
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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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|
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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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|
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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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|
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Coroutine *recv_coroutine[MAX_NBD_REQUESTS]; |
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struct nbd_reply reply;
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|
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int is_unix;
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char *host_spec;
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char *export_name; /* An NBD server may export several devices */ |
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} BDRVNBDState; |
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|
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static int nbd_parse_uri(BDRVNBDState *s, const char *filename) |
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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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uri = uri_parse(filename); |
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if (!uri) {
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return -EINVAL;
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} |
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|
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/* transport */
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if (!strcmp(uri->scheme, "nbd")) { |
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s->is_unix = false;
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} else if (!strcmp(uri->scheme, "nbd+tcp")) { |
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s->is_unix = false;
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} else if (!strcmp(uri->scheme, "nbd+unix")) { |
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s->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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s->export_name = g_strdup(p); |
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} |
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qp = query_params_parse(uri->query); |
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if (qp->n > 1 || (s->is_unix && !qp->n) || (!s->is_unix && qp->n)) { |
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ret = -EINVAL; |
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goto out;
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} |
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|
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if (s->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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s->host_spec = g_strdup(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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if (!uri->port) {
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uri->port = NBD_DEFAULT_PORT; |
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} |
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s->host_spec = g_strdup_printf("%s:%d", uri->server, uri->port);
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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 int nbd_config(BDRVNBDState *s, const char *filename) |
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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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int err = -EINVAL;
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if (strstr(filename, "://")) { |
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return nbd_parse_uri(s, filename);
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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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s->export_name = g_strdup(export_name); |
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} |
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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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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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s->is_unix = true;
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s->host_spec = g_strdup(unixpath); |
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} else {
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s->is_unix = false;
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s->host_spec = g_strdup(host_spec); |
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} |
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err = 0;
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out:
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g_free(file); |
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if (err != 0) { |
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g_free(s->export_name); |
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g_free(s->host_spec); |
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} |
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return err;
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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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|
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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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|
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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); |
276 |
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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} |
286 |
|
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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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|
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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(); |
296 |
*reply = s->reply; |
297 |
if (reply->handle != request->handle) {
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reply->error = EIO; |
299 |
} else {
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if (qiov && reply->error == 0) { |
301 |
ret = qemu_co_recvv(s->sock, qiov->iov, qiov->niov, |
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offset, request->len); |
303 |
if (ret != request->len) {
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reply->error = EIO; |
305 |
} |
306 |
} |
307 |
|
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/* Tell the read handler to read another header. */
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s->reply.handle = 0;
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} |
311 |
} |
312 |
|
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static void nbd_coroutine_end(BDRVNBDState *s, struct nbd_request *request) |
314 |
{ |
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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); |
319 |
} |
320 |
} |
321 |
|
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static int nbd_establish_connection(BlockDriverState *bs) |
323 |
{ |
324 |
BDRVNBDState *s = bs->opaque; |
325 |
int sock;
|
326 |
int ret;
|
327 |
off_t size; |
328 |
size_t blocksize; |
329 |
|
330 |
if (s->is_unix) {
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331 |
sock = unix_socket_outgoing(s->host_spec); |
332 |
} else {
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333 |
sock = tcp_socket_outgoing_spec(s->host_spec); |
334 |
} |
335 |
|
336 |
/* Failed to establish connection */
|
337 |
if (sock < 0) { |
338 |
logout("Failed to establish connection to NBD server\n");
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return -errno;
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340 |
} |
341 |
|
342 |
/* NBD handshake */
|
343 |
ret = nbd_receive_negotiate(sock, s->export_name, &s->nbdflags, &size, |
344 |
&blocksize); |
345 |
if (ret < 0) { |
346 |
logout("Failed to negotiate with the NBD server\n");
|
347 |
closesocket(sock); |
348 |
return ret;
|
349 |
} |
350 |
|
351 |
/* Now that we're connected, set the socket to be non-blocking and
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352 |
* kick the reply mechanism. */
|
353 |
socket_set_nonblock(sock); |
354 |
qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL,
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355 |
nbd_have_request, s); |
356 |
|
357 |
s->sock = sock; |
358 |
s->size = size; |
359 |
s->blocksize = blocksize; |
360 |
|
361 |
logout("Established connection with NBD server\n");
|
362 |
return 0; |
363 |
} |
364 |
|
365 |
static void nbd_teardown_connection(BlockDriverState *bs) |
366 |
{ |
367 |
BDRVNBDState *s = bs->opaque; |
368 |
struct nbd_request request;
|
369 |
|
370 |
request.type = NBD_CMD_DISC; |
371 |
request.from = 0;
|
372 |
request.len = 0;
|
373 |
nbd_send_request(s->sock, &request); |
374 |
|
375 |
qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL, NULL); |
376 |
closesocket(s->sock); |
377 |
} |
378 |
|
379 |
static int nbd_open(BlockDriverState *bs, const char* filename, int flags) |
380 |
{ |
381 |
BDRVNBDState *s = bs->opaque; |
382 |
int result;
|
383 |
|
384 |
qemu_co_mutex_init(&s->send_mutex); |
385 |
qemu_co_mutex_init(&s->free_sema); |
386 |
|
387 |
/* Pop the config into our state object. Exit if invalid. */
|
388 |
result = nbd_config(s, filename); |
389 |
if (result != 0) { |
390 |
return result;
|
391 |
} |
392 |
|
393 |
/* establish TCP connection, return error if it fails
|
394 |
* TODO: Configurable retry-until-timeout behaviour.
|
395 |
*/
|
396 |
result = nbd_establish_connection(bs); |
397 |
|
398 |
return result;
|
399 |
} |
400 |
|
401 |
static int nbd_co_readv_1(BlockDriverState *bs, int64_t sector_num, |
402 |
int nb_sectors, QEMUIOVector *qiov,
|
403 |
int offset)
|
404 |
{ |
405 |
BDRVNBDState *s = bs->opaque; |
406 |
struct nbd_request request;
|
407 |
struct nbd_reply reply;
|
408 |
ssize_t ret; |
409 |
|
410 |
request.type = NBD_CMD_READ; |
411 |
request.from = sector_num * 512;
|
412 |
request.len = nb_sectors * 512;
|
413 |
|
414 |
nbd_coroutine_start(s, &request); |
415 |
ret = nbd_co_send_request(s, &request, NULL, 0); |
416 |
if (ret < 0) { |
417 |
reply.error = -ret; |
418 |
} else {
|
419 |
nbd_co_receive_reply(s, &request, &reply, qiov, offset); |
420 |
} |
421 |
nbd_coroutine_end(s, &request); |
422 |
return -reply.error;
|
423 |
|
424 |
} |
425 |
|
426 |
static int nbd_co_writev_1(BlockDriverState *bs, int64_t sector_num, |
427 |
int nb_sectors, QEMUIOVector *qiov,
|
428 |
int offset)
|
429 |
{ |
430 |
BDRVNBDState *s = bs->opaque; |
431 |
struct nbd_request request;
|
432 |
struct nbd_reply reply;
|
433 |
ssize_t ret; |
434 |
|
435 |
request.type = NBD_CMD_WRITE; |
436 |
if (!bdrv_enable_write_cache(bs) && (s->nbdflags & NBD_FLAG_SEND_FUA)) {
|
437 |
request.type |= NBD_CMD_FLAG_FUA; |
438 |
} |
439 |
|
440 |
request.from = sector_num * 512;
|
441 |
request.len = nb_sectors * 512;
|
442 |
|
443 |
nbd_coroutine_start(s, &request); |
444 |
ret = nbd_co_send_request(s, &request, qiov, offset); |
445 |
if (ret < 0) { |
446 |
reply.error = -ret; |
447 |
} else {
|
448 |
nbd_co_receive_reply(s, &request, &reply, NULL, 0); |
449 |
} |
450 |
nbd_coroutine_end(s, &request); |
451 |
return -reply.error;
|
452 |
} |
453 |
|
454 |
/* qemu-nbd has a limit of slightly less than 1M per request. Try to
|
455 |
* remain aligned to 4K. */
|
456 |
#define NBD_MAX_SECTORS 2040 |
457 |
|
458 |
static int nbd_co_readv(BlockDriverState *bs, int64_t sector_num, |
459 |
int nb_sectors, QEMUIOVector *qiov)
|
460 |
{ |
461 |
int offset = 0; |
462 |
int ret;
|
463 |
while (nb_sectors > NBD_MAX_SECTORS) {
|
464 |
ret = nbd_co_readv_1(bs, sector_num, NBD_MAX_SECTORS, qiov, offset); |
465 |
if (ret < 0) { |
466 |
return ret;
|
467 |
} |
468 |
offset += NBD_MAX_SECTORS * 512;
|
469 |
sector_num += NBD_MAX_SECTORS; |
470 |
nb_sectors -= NBD_MAX_SECTORS; |
471 |
} |
472 |
return nbd_co_readv_1(bs, sector_num, nb_sectors, qiov, offset);
|
473 |
} |
474 |
|
475 |
static int nbd_co_writev(BlockDriverState *bs, int64_t sector_num, |
476 |
int nb_sectors, QEMUIOVector *qiov)
|
477 |
{ |
478 |
int offset = 0; |
479 |
int ret;
|
480 |
while (nb_sectors > NBD_MAX_SECTORS) {
|
481 |
ret = nbd_co_writev_1(bs, sector_num, NBD_MAX_SECTORS, qiov, offset); |
482 |
if (ret < 0) { |
483 |
return ret;
|
484 |
} |
485 |
offset += NBD_MAX_SECTORS * 512;
|
486 |
sector_num += NBD_MAX_SECTORS; |
487 |
nb_sectors -= NBD_MAX_SECTORS; |
488 |
} |
489 |
return nbd_co_writev_1(bs, sector_num, nb_sectors, qiov, offset);
|
490 |
} |
491 |
|
492 |
static int nbd_co_flush(BlockDriverState *bs) |
493 |
{ |
494 |
BDRVNBDState *s = bs->opaque; |
495 |
struct nbd_request request;
|
496 |
struct nbd_reply reply;
|
497 |
ssize_t ret; |
498 |
|
499 |
if (!(s->nbdflags & NBD_FLAG_SEND_FLUSH)) {
|
500 |
return 0; |
501 |
} |
502 |
|
503 |
request.type = NBD_CMD_FLUSH; |
504 |
if (s->nbdflags & NBD_FLAG_SEND_FUA) {
|
505 |
request.type |= NBD_CMD_FLAG_FUA; |
506 |
} |
507 |
|
508 |
request.from = 0;
|
509 |
request.len = 0;
|
510 |
|
511 |
nbd_coroutine_start(s, &request); |
512 |
ret = nbd_co_send_request(s, &request, NULL, 0); |
513 |
if (ret < 0) { |
514 |
reply.error = -ret; |
515 |
} else {
|
516 |
nbd_co_receive_reply(s, &request, &reply, NULL, 0); |
517 |
} |
518 |
nbd_coroutine_end(s, &request); |
519 |
return -reply.error;
|
520 |
} |
521 |
|
522 |
static int nbd_co_discard(BlockDriverState *bs, int64_t sector_num, |
523 |
int nb_sectors)
|
524 |
{ |
525 |
BDRVNBDState *s = bs->opaque; |
526 |
struct nbd_request request;
|
527 |
struct nbd_reply reply;
|
528 |
ssize_t ret; |
529 |
|
530 |
if (!(s->nbdflags & NBD_FLAG_SEND_TRIM)) {
|
531 |
return 0; |
532 |
} |
533 |
request.type = NBD_CMD_TRIM; |
534 |
request.from = sector_num * 512;;
|
535 |
request.len = nb_sectors * 512;
|
536 |
|
537 |
nbd_coroutine_start(s, &request); |
538 |
ret = nbd_co_send_request(s, &request, NULL, 0); |
539 |
if (ret < 0) { |
540 |
reply.error = -ret; |
541 |
} else {
|
542 |
nbd_co_receive_reply(s, &request, &reply, NULL, 0); |
543 |
} |
544 |
nbd_coroutine_end(s, &request); |
545 |
return -reply.error;
|
546 |
} |
547 |
|
548 |
static void nbd_close(BlockDriverState *bs) |
549 |
{ |
550 |
BDRVNBDState *s = bs->opaque; |
551 |
g_free(s->export_name); |
552 |
g_free(s->host_spec); |
553 |
|
554 |
nbd_teardown_connection(bs); |
555 |
} |
556 |
|
557 |
static int64_t nbd_getlength(BlockDriverState *bs)
|
558 |
{ |
559 |
BDRVNBDState *s = bs->opaque; |
560 |
|
561 |
return s->size;
|
562 |
} |
563 |
|
564 |
static BlockDriver bdrv_nbd = {
|
565 |
.format_name = "nbd",
|
566 |
.protocol_name = "nbd",
|
567 |
.instance_size = sizeof(BDRVNBDState),
|
568 |
.bdrv_file_open = nbd_open, |
569 |
.bdrv_co_readv = nbd_co_readv, |
570 |
.bdrv_co_writev = nbd_co_writev, |
571 |
.bdrv_close = nbd_close, |
572 |
.bdrv_co_flush_to_os = nbd_co_flush, |
573 |
.bdrv_co_discard = nbd_co_discard, |
574 |
.bdrv_getlength = nbd_getlength, |
575 |
}; |
576 |
|
577 |
static BlockDriver bdrv_nbd_tcp = {
|
578 |
.format_name = "nbd",
|
579 |
.protocol_name = "nbd+tcp",
|
580 |
.instance_size = sizeof(BDRVNBDState),
|
581 |
.bdrv_file_open = nbd_open, |
582 |
.bdrv_co_readv = nbd_co_readv, |
583 |
.bdrv_co_writev = nbd_co_writev, |
584 |
.bdrv_close = nbd_close, |
585 |
.bdrv_co_flush_to_os = nbd_co_flush, |
586 |
.bdrv_co_discard = nbd_co_discard, |
587 |
.bdrv_getlength = nbd_getlength, |
588 |
}; |
589 |
|
590 |
static BlockDriver bdrv_nbd_unix = {
|
591 |
.format_name = "nbd",
|
592 |
.protocol_name = "nbd+unix",
|
593 |
.instance_size = sizeof(BDRVNBDState),
|
594 |
.bdrv_file_open = nbd_open, |
595 |
.bdrv_co_readv = nbd_co_readv, |
596 |
.bdrv_co_writev = nbd_co_writev, |
597 |
.bdrv_close = nbd_close, |
598 |
.bdrv_co_flush_to_os = nbd_co_flush, |
599 |
.bdrv_co_discard = nbd_co_discard, |
600 |
.bdrv_getlength = nbd_getlength, |
601 |
}; |
602 |
|
603 |
static void bdrv_nbd_init(void) |
604 |
{ |
605 |
bdrv_register(&bdrv_nbd); |
606 |
bdrv_register(&bdrv_nbd_tcp); |
607 |
bdrv_register(&bdrv_nbd_unix); |
608 |
} |
609 |
|
610 |
block_init(bdrv_nbd_init); |