2008-07-03 13:41:03 +00:00
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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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2008-07-08 18:57:05 +00:00
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* Author: Laurent Vivier <Laurent.Vivier@bull.net>
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2008-07-03 13:41:03 +00:00
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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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2011-09-06 16:58:58 +00:00
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#include "block_int.h"
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2009-05-09 22:03:42 +00:00
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#include "module.h"
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2011-02-22 15:44:54 +00:00
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#include "qemu_socket.h"
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2008-07-03 13:41:03 +00:00
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#include <sys/types.h>
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#include <unistd.h>
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2010-08-25 20:48:33 +00:00
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#define EN_OPTSTR ":exportname="
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2011-02-22 15:44:54 +00:00
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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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2011-09-10 13:06:52 +00:00
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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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2008-07-03 13:41:03 +00:00
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typedef struct BDRVNBDState {
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int sock;
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2011-09-08 15:24:54 +00:00
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uint32_t nbdflags;
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2008-07-03 13:41:03 +00:00
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off_t size;
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size_t blocksize;
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2011-02-22 15:44:54 +00:00
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char *export_name; /* An NBD server may export several devices */
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2011-09-10 13:06:52 +00:00
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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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2011-09-08 12:28:59 +00:00
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2011-09-10 13:06:52 +00:00
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Coroutine *recv_coroutine[MAX_NBD_REQUESTS];
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2011-09-08 12:28:59 +00:00
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struct nbd_reply reply;
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2011-02-22 15:44:54 +00:00
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/* If it begins with '/', this is a UNIX domain socket. Otherwise,
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* it's a string of the form <hostname|ip4|\[ip6\]>:port
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*/
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char *host_spec;
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2008-07-03 13:41:03 +00:00
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} BDRVNBDState;
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2011-02-22 15:44:54 +00:00
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static int nbd_config(BDRVNBDState *s, const char *filename, int flags)
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2008-07-03 13:41:03 +00:00
|
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{
|
2010-08-25 20:48:33 +00:00
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char *file;
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2011-02-22 15:44:54 +00:00
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char *export_name;
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const char *host_spec;
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2008-07-03 13:41:03 +00:00
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const char *unixpath;
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2010-08-25 20:48:33 +00:00
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int err = -EINVAL;
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2008-07-03 13:41:03 +00:00
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2011-08-21 03:09:37 +00:00
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file = g_strdup(filename);
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2010-08-25 20:48:33 +00:00
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2011-02-22 15:44:54 +00:00
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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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2010-08-25 20:48:33 +00:00
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goto out;
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}
|
2011-02-22 15:44:54 +00:00
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export_name[0] = 0; /* truncate 'file' */
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export_name += strlen(EN_OPTSTR);
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2011-08-21 03:09:37 +00:00
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s->export_name = g_strdup(export_name);
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2010-08-25 20:48:33 +00:00
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}
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2011-02-22 15:44:54 +00:00
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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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2010-08-25 20:48:33 +00:00
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goto out;
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}
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2008-07-03 13:41:03 +00:00
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2011-02-22 15:44:54 +00:00
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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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if (unixpath[0] != '/') { /* We demand an absolute path*/
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2010-08-25 20:48:33 +00:00
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goto out;
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}
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2011-08-21 03:09:37 +00:00
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s->host_spec = g_strdup(unixpath);
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2008-07-03 13:41:03 +00:00
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} else {
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2011-08-21 03:09:37 +00:00
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s->host_spec = g_strdup(host_spec);
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2011-02-22 15:44:54 +00:00
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}
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2008-07-03 13:41:03 +00:00
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2011-02-22 15:44:54 +00:00
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err = 0;
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2008-07-03 13:41:03 +00:00
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2011-02-22 15:44:54 +00:00
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out:
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2011-08-21 03:09:37 +00:00
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g_free(file);
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2011-02-22 15:44:54 +00:00
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if (err != 0) {
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2011-08-21 03:09:37 +00:00
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g_free(s->export_name);
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g_free(s->host_spec);
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2011-02-22 15:44:54 +00:00
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}
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return err;
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}
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2010-08-25 20:48:33 +00:00
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2011-09-08 12:28:59 +00:00
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static void nbd_coroutine_start(BDRVNBDState *s, struct nbd_request *request)
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{
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2011-09-10 13:06:52 +00:00
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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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2011-09-08 12:28:59 +00:00
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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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2011-09-10 13:06:52 +00:00
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return s->in_flight > 0;
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2011-09-08 12:28:59 +00:00
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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;
|
2012-03-12 14:23:13 +00:00
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uint64_t i;
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2012-03-05 08:10:35 +00:00
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int ret;
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2011-09-08 12:28:59 +00:00
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if (s->reply.handle == 0) {
|
2012-03-05 08:10:35 +00:00
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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) {
|
2011-09-08 12:28:59 +00:00
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s->reply.handle = 0;
|
2011-09-10 13:06:52 +00:00
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goto fail;
|
2011-09-08 12:28:59 +00:00
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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. */
|
2011-09-10 13:06:52 +00:00
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i = HANDLE_TO_INDEX(s, s->reply.handle);
|
2012-03-12 14:23:13 +00:00
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if (i >= MAX_NBD_REQUESTS) {
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goto fail;
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}
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2011-09-10 13:06:52 +00:00
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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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|
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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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}
|
2011-09-08 12:28:59 +00:00
|
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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;
|
2011-09-10 13:06:52 +00:00
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qemu_coroutine_enter(s->send_coroutine, NULL);
|
2011-09-08 12:28:59 +00:00
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}
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static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request,
|
2012-06-07 16:22:46 +00:00
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QEMUIOVector *qiov, int offset)
|
2011-09-08 12:28:59 +00:00
|
|
|
{
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int rc, ret;
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|
|
2011-09-10 13:06:52 +00:00
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qemu_co_mutex_lock(&s->send_mutex);
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s->send_coroutine = qemu_coroutine_self();
|
2011-09-08 12:28:59 +00:00
|
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|
qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, nbd_restart_write,
|
2012-04-12 12:00:54 +00:00
|
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nbd_have_request, s);
|
2011-09-08 12:28:59 +00:00
|
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rc = nbd_send_request(s->sock, request);
|
2012-06-07 16:22:46 +00:00
|
|
|
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);
|
2011-09-08 12:28:59 +00:00
|
|
|
if (ret != request->len) {
|
2012-03-05 07:56:10 +00:00
|
|
|
return -EIO;
|
2011-09-08 12:28:59 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
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qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, NULL,
|
2012-04-12 12:00:54 +00:00
|
|
|
nbd_have_request, s);
|
2011-09-10 13:06:52 +00:00
|
|
|
s->send_coroutine = NULL;
|
|
|
|
qemu_co_mutex_unlock(&s->send_mutex);
|
2011-09-08 12:28:59 +00:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nbd_co_receive_reply(BDRVNBDState *s, struct nbd_request *request,
|
|
|
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struct nbd_reply *reply,
|
2012-06-07 16:22:46 +00:00
|
|
|
QEMUIOVector *qiov, int offset)
|
2011-09-08 12:28:59 +00:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2011-09-10 13:06:52 +00:00
|
|
|
/* 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? */
|
2011-09-08 12:28:59 +00:00
|
|
|
qemu_coroutine_yield();
|
|
|
|
*reply = s->reply;
|
|
|
|
if (reply->handle != request->handle) {
|
|
|
|
reply->error = EIO;
|
|
|
|
} else {
|
2012-06-07 16:22:46 +00:00
|
|
|
if (qiov && reply->error == 0) {
|
|
|
|
ret = qemu_co_recvv(s->sock, qiov->iov, qiov->niov,
|
|
|
|
offset, request->len);
|
2011-09-08 12:28:59 +00:00
|
|
|
if (ret != request->len) {
|
|
|
|
reply->error = EIO;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Tell the read handler to read another header. */
|
|
|
|
s->reply.handle = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nbd_coroutine_end(BDRVNBDState *s, struct nbd_request *request)
|
|
|
|
{
|
2011-09-10 13:06:52 +00:00
|
|
|
int i = HANDLE_TO_INDEX(s, request->handle);
|
|
|
|
s->recv_coroutine[i] = NULL;
|
|
|
|
if (s->in_flight-- == MAX_NBD_REQUESTS) {
|
|
|
|
qemu_co_mutex_unlock(&s->free_sema);
|
|
|
|
}
|
2011-09-08 12:28:59 +00:00
|
|
|
}
|
|
|
|
|
2011-02-22 15:44:54 +00:00
|
|
|
static int nbd_establish_connection(BlockDriverState *bs)
|
|
|
|
{
|
|
|
|
BDRVNBDState *s = bs->opaque;
|
|
|
|
int sock;
|
|
|
|
int ret;
|
|
|
|
off_t size;
|
|
|
|
size_t blocksize;
|
2008-07-03 13:41:03 +00:00
|
|
|
|
2011-02-22 15:44:54 +00:00
|
|
|
if (s->host_spec[0] == '/') {
|
|
|
|
sock = unix_socket_outgoing(s->host_spec);
|
|
|
|
} else {
|
|
|
|
sock = tcp_socket_outgoing_spec(s->host_spec);
|
2008-07-03 13:41:03 +00:00
|
|
|
}
|
|
|
|
|
2011-02-22 15:44:54 +00:00
|
|
|
/* Failed to establish connection */
|
2012-03-07 10:05:34 +00:00
|
|
|
if (sock < 0) {
|
2011-02-22 15:44:54 +00:00
|
|
|
logout("Failed to establish connection to NBD server\n");
|
|
|
|
return -errno;
|
2010-08-25 20:48:33 +00:00
|
|
|
}
|
2008-07-03 13:41:03 +00:00
|
|
|
|
2011-02-22 15:44:54 +00:00
|
|
|
/* NBD handshake */
|
2011-09-08 15:24:54 +00:00
|
|
|
ret = nbd_receive_negotiate(sock, s->export_name, &s->nbdflags, &size,
|
2011-02-22 15:44:54 +00:00
|
|
|
&blocksize);
|
2012-03-07 10:05:34 +00:00
|
|
|
if (ret < 0) {
|
2011-02-22 15:44:54 +00:00
|
|
|
logout("Failed to negotiate with the NBD server\n");
|
|
|
|
closesocket(sock);
|
2012-03-05 07:56:10 +00:00
|
|
|
return ret;
|
2010-08-25 20:48:33 +00:00
|
|
|
}
|
2008-07-03 13:41:03 +00:00
|
|
|
|
2011-09-08 12:28:59 +00:00
|
|
|
/* Now that we're connected, set the socket to be non-blocking and
|
|
|
|
* kick the reply mechanism. */
|
2011-02-22 15:44:54 +00:00
|
|
|
socket_set_nonblock(sock);
|
2012-04-26 11:45:30 +00:00
|
|
|
qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL,
|
2012-04-12 12:00:54 +00:00
|
|
|
nbd_have_request, s);
|
2011-02-22 15:44:54 +00:00
|
|
|
|
2008-07-03 13:41:03 +00:00
|
|
|
s->sock = sock;
|
|
|
|
s->size = size;
|
|
|
|
s->blocksize = blocksize;
|
|
|
|
|
2011-02-22 15:44:54 +00:00
|
|
|
logout("Established connection with NBD server\n");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nbd_teardown_connection(BlockDriverState *bs)
|
|
|
|
{
|
|
|
|
BDRVNBDState *s = bs->opaque;
|
|
|
|
struct nbd_request request;
|
|
|
|
|
|
|
|
request.type = NBD_CMD_DISC;
|
|
|
|
request.from = 0;
|
|
|
|
request.len = 0;
|
|
|
|
nbd_send_request(s->sock, &request);
|
|
|
|
|
2012-04-12 12:00:54 +00:00
|
|
|
qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL, NULL);
|
2011-02-22 15:44:54 +00:00
|
|
|
closesocket(s->sock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int nbd_open(BlockDriverState *bs, const char* filename, int flags)
|
|
|
|
{
|
|
|
|
BDRVNBDState *s = bs->opaque;
|
|
|
|
int result;
|
|
|
|
|
2011-09-10 13:06:52 +00:00
|
|
|
qemu_co_mutex_init(&s->send_mutex);
|
|
|
|
qemu_co_mutex_init(&s->free_sema);
|
2011-09-08 12:28:59 +00:00
|
|
|
|
2011-02-22 15:44:54 +00:00
|
|
|
/* Pop the config into our state object. Exit if invalid. */
|
|
|
|
result = nbd_config(s, filename, flags);
|
|
|
|
if (result != 0) {
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* establish TCP connection, return error if it fails
|
|
|
|
* TODO: Configurable retry-until-timeout behaviour.
|
|
|
|
*/
|
|
|
|
result = nbd_establish_connection(bs);
|
|
|
|
|
|
|
|
return result;
|
2008-07-03 13:41:03 +00:00
|
|
|
}
|
|
|
|
|
2011-09-10 13:06:52 +00:00
|
|
|
static int nbd_co_readv_1(BlockDriverState *bs, int64_t sector_num,
|
|
|
|
int nb_sectors, QEMUIOVector *qiov,
|
|
|
|
int offset)
|
2008-07-03 13:41:03 +00:00
|
|
|
{
|
|
|
|
BDRVNBDState *s = bs->opaque;
|
|
|
|
struct nbd_request request;
|
|
|
|
struct nbd_reply reply;
|
2012-03-07 10:05:34 +00:00
|
|
|
ssize_t ret;
|
2008-07-03 13:41:03 +00:00
|
|
|
|
|
|
|
request.type = NBD_CMD_READ;
|
2011-11-29 08:52:38 +00:00
|
|
|
request.from = sector_num * 512;
|
2008-07-03 13:41:03 +00:00
|
|
|
request.len = nb_sectors * 512;
|
|
|
|
|
2011-09-08 12:28:59 +00:00
|
|
|
nbd_coroutine_start(s, &request);
|
2012-03-07 10:05:34 +00:00
|
|
|
ret = nbd_co_send_request(s, &request, NULL, 0);
|
|
|
|
if (ret < 0) {
|
2012-03-05 07:56:10 +00:00
|
|
|
reply.error = -ret;
|
2011-09-08 12:28:59 +00:00
|
|
|
} else {
|
2012-06-07 16:22:46 +00:00
|
|
|
nbd_co_receive_reply(s, &request, &reply, qiov, offset);
|
2011-09-08 12:28:59 +00:00
|
|
|
}
|
|
|
|
nbd_coroutine_end(s, &request);
|
|
|
|
return -reply.error;
|
2008-07-03 13:41:03 +00:00
|
|
|
|
|
|
|
}
|
|
|
|
|
2011-09-10 13:06:52 +00:00
|
|
|
static int nbd_co_writev_1(BlockDriverState *bs, int64_t sector_num,
|
|
|
|
int nb_sectors, QEMUIOVector *qiov,
|
|
|
|
int offset)
|
2008-07-03 13:41:03 +00:00
|
|
|
{
|
|
|
|
BDRVNBDState *s = bs->opaque;
|
|
|
|
struct nbd_request request;
|
|
|
|
struct nbd_reply reply;
|
2012-03-07 10:05:34 +00:00
|
|
|
ssize_t ret;
|
2008-07-03 13:41:03 +00:00
|
|
|
|
|
|
|
request.type = NBD_CMD_WRITE;
|
2011-10-21 11:16:28 +00:00
|
|
|
if (!bdrv_enable_write_cache(bs) && (s->nbdflags & NBD_FLAG_SEND_FUA)) {
|
|
|
|
request.type |= NBD_CMD_FLAG_FUA;
|
|
|
|
}
|
|
|
|
|
2011-11-29 08:52:38 +00:00
|
|
|
request.from = sector_num * 512;
|
2008-07-03 13:41:03 +00:00
|
|
|
request.len = nb_sectors * 512;
|
|
|
|
|
2011-09-08 12:28:59 +00:00
|
|
|
nbd_coroutine_start(s, &request);
|
2012-06-07 16:22:46 +00:00
|
|
|
ret = nbd_co_send_request(s, &request, qiov, offset);
|
2012-03-07 10:05:34 +00:00
|
|
|
if (ret < 0) {
|
2012-03-05 07:56:10 +00:00
|
|
|
reply.error = -ret;
|
2011-09-08 12:28:59 +00:00
|
|
|
} else {
|
|
|
|
nbd_co_receive_reply(s, &request, &reply, NULL, 0);
|
|
|
|
}
|
|
|
|
nbd_coroutine_end(s, &request);
|
|
|
|
return -reply.error;
|
2011-10-20 11:16:23 +00:00
|
|
|
}
|
|
|
|
|
2011-09-10 13:06:52 +00:00
|
|
|
/* qemu-nbd has a limit of slightly less than 1M per request. Try to
|
|
|
|
* remain aligned to 4K. */
|
|
|
|
#define NBD_MAX_SECTORS 2040
|
|
|
|
|
|
|
|
static int nbd_co_readv(BlockDriverState *bs, int64_t sector_num,
|
|
|
|
int nb_sectors, QEMUIOVector *qiov)
|
|
|
|
{
|
|
|
|
int offset = 0;
|
|
|
|
int ret;
|
|
|
|
while (nb_sectors > NBD_MAX_SECTORS) {
|
|
|
|
ret = nbd_co_readv_1(bs, sector_num, NBD_MAX_SECTORS, qiov, offset);
|
|
|
|
if (ret < 0) {
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
offset += NBD_MAX_SECTORS * 512;
|
|
|
|
sector_num += NBD_MAX_SECTORS;
|
|
|
|
nb_sectors -= NBD_MAX_SECTORS;
|
|
|
|
}
|
|
|
|
return nbd_co_readv_1(bs, sector_num, nb_sectors, qiov, offset);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int nbd_co_writev(BlockDriverState *bs, int64_t sector_num,
|
|
|
|
int nb_sectors, QEMUIOVector *qiov)
|
|
|
|
{
|
|
|
|
int offset = 0;
|
|
|
|
int ret;
|
|
|
|
while (nb_sectors > NBD_MAX_SECTORS) {
|
|
|
|
ret = nbd_co_writev_1(bs, sector_num, NBD_MAX_SECTORS, qiov, offset);
|
|
|
|
if (ret < 0) {
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
offset += NBD_MAX_SECTORS * 512;
|
|
|
|
sector_num += NBD_MAX_SECTORS;
|
|
|
|
nb_sectors -= NBD_MAX_SECTORS;
|
|
|
|
}
|
|
|
|
return nbd_co_writev_1(bs, sector_num, nb_sectors, qiov, offset);
|
|
|
|
}
|
|
|
|
|
2011-10-21 11:17:14 +00:00
|
|
|
static int nbd_co_flush(BlockDriverState *bs)
|
|
|
|
{
|
|
|
|
BDRVNBDState *s = bs->opaque;
|
|
|
|
struct nbd_request request;
|
|
|
|
struct nbd_reply reply;
|
2012-03-07 10:05:34 +00:00
|
|
|
ssize_t ret;
|
2011-10-21 11:17:14 +00:00
|
|
|
|
|
|
|
if (!(s->nbdflags & NBD_FLAG_SEND_FLUSH)) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
request.type = NBD_CMD_FLUSH;
|
|
|
|
if (s->nbdflags & NBD_FLAG_SEND_FUA) {
|
|
|
|
request.type |= NBD_CMD_FLAG_FUA;
|
|
|
|
}
|
|
|
|
|
|
|
|
request.from = 0;
|
|
|
|
request.len = 0;
|
|
|
|
|
|
|
|
nbd_coroutine_start(s, &request);
|
2012-03-07 10:05:34 +00:00
|
|
|
ret = nbd_co_send_request(s, &request, NULL, 0);
|
|
|
|
if (ret < 0) {
|
2012-03-05 07:56:10 +00:00
|
|
|
reply.error = -ret;
|
2011-10-21 11:17:14 +00:00
|
|
|
} else {
|
|
|
|
nbd_co_receive_reply(s, &request, &reply, NULL, 0);
|
|
|
|
}
|
|
|
|
nbd_coroutine_end(s, &request);
|
|
|
|
return -reply.error;
|
|
|
|
}
|
|
|
|
|
2011-10-21 11:17:14 +00:00
|
|
|
static int nbd_co_discard(BlockDriverState *bs, int64_t sector_num,
|
|
|
|
int nb_sectors)
|
|
|
|
{
|
|
|
|
BDRVNBDState *s = bs->opaque;
|
|
|
|
struct nbd_request request;
|
|
|
|
struct nbd_reply reply;
|
2012-03-07 10:05:34 +00:00
|
|
|
ssize_t ret;
|
2011-10-21 11:17:14 +00:00
|
|
|
|
|
|
|
if (!(s->nbdflags & NBD_FLAG_SEND_TRIM)) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
request.type = NBD_CMD_TRIM;
|
|
|
|
request.from = sector_num * 512;;
|
|
|
|
request.len = nb_sectors * 512;
|
|
|
|
|
|
|
|
nbd_coroutine_start(s, &request);
|
2012-03-07 10:05:34 +00:00
|
|
|
ret = nbd_co_send_request(s, &request, NULL, 0);
|
|
|
|
if (ret < 0) {
|
2012-03-05 07:56:10 +00:00
|
|
|
reply.error = -ret;
|
2011-10-21 11:17:14 +00:00
|
|
|
} else {
|
|
|
|
nbd_co_receive_reply(s, &request, &reply, NULL, 0);
|
|
|
|
}
|
|
|
|
nbd_coroutine_end(s, &request);
|
|
|
|
return -reply.error;
|
|
|
|
}
|
|
|
|
|
2008-07-03 13:41:03 +00:00
|
|
|
static void nbd_close(BlockDriverState *bs)
|
|
|
|
{
|
2011-04-28 15:20:01 +00:00
|
|
|
BDRVNBDState *s = bs->opaque;
|
2011-08-21 03:09:37 +00:00
|
|
|
g_free(s->export_name);
|
|
|
|
g_free(s->host_spec);
|
2011-04-28 15:20:01 +00:00
|
|
|
|
2011-02-22 15:44:54 +00:00
|
|
|
nbd_teardown_connection(bs);
|
2008-07-03 13:41:03 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int64_t nbd_getlength(BlockDriverState *bs)
|
|
|
|
{
|
|
|
|
BDRVNBDState *s = bs->opaque;
|
|
|
|
|
|
|
|
return s->size;
|
|
|
|
}
|
|
|
|
|
2009-05-09 22:03:42 +00:00
|
|
|
static BlockDriver bdrv_nbd = {
|
2011-10-21 11:17:14 +00:00
|
|
|
.format_name = "nbd",
|
|
|
|
.instance_size = sizeof(BDRVNBDState),
|
|
|
|
.bdrv_file_open = nbd_open,
|
|
|
|
.bdrv_co_readv = nbd_co_readv,
|
|
|
|
.bdrv_co_writev = nbd_co_writev,
|
|
|
|
.bdrv_close = nbd_close,
|
|
|
|
.bdrv_co_flush_to_os = nbd_co_flush,
|
2011-10-21 11:17:14 +00:00
|
|
|
.bdrv_co_discard = nbd_co_discard,
|
2011-10-21 11:17:14 +00:00
|
|
|
.bdrv_getlength = nbd_getlength,
|
|
|
|
.protocol_name = "nbd",
|
2008-07-03 13:41:03 +00:00
|
|
|
};
|
2009-05-09 22:03:42 +00:00
|
|
|
|
|
|
|
static void bdrv_nbd_init(void)
|
|
|
|
{
|
|
|
|
bdrv_register(&bdrv_nbd);
|
|
|
|
}
|
|
|
|
|
|
|
|
block_init(bdrv_nbd_init);
|