2012-08-22 18:43:07 +04:00
|
|
|
/*
|
|
|
|
* Serving QEMU block devices via NBD
|
|
|
|
*
|
|
|
|
* Copyright (c) 2012 Red Hat, Inc.
|
|
|
|
*
|
|
|
|
* Author: Paolo Bonzini <pbonzini@redhat.com>
|
|
|
|
*
|
|
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or
|
|
|
|
* later. See the COPYING file in the top-level directory.
|
|
|
|
*/
|
|
|
|
|
2012-12-17 21:20:04 +04:00
|
|
|
#include "sysemu/blockdev.h"
|
2014-11-18 14:21:17 +03:00
|
|
|
#include "sysemu/block-backend.h"
|
2013-02-05 20:06:20 +04:00
|
|
|
#include "hw/block/block.h"
|
2012-12-17 21:19:43 +04:00
|
|
|
#include "qapi/qmp/qerror.h"
|
2012-12-17 21:20:04 +04:00
|
|
|
#include "sysemu/sysemu.h"
|
2012-08-22 18:43:07 +04:00
|
|
|
#include "qmp-commands.h"
|
|
|
|
#include "trace.h"
|
2012-12-17 21:19:44 +04:00
|
|
|
#include "block/nbd.h"
|
2012-12-17 21:20:00 +04:00
|
|
|
#include "qemu/sockets.h"
|
2012-08-22 18:43:07 +04:00
|
|
|
|
|
|
|
static int server_fd = -1;
|
|
|
|
|
|
|
|
static void nbd_accept(void *opaque)
|
|
|
|
{
|
|
|
|
struct sockaddr_in addr;
|
|
|
|
socklen_t addr_len = sizeof(addr);
|
|
|
|
|
|
|
|
int fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len);
|
2016-01-14 11:41:01 +03:00
|
|
|
if (fd >= 0) {
|
|
|
|
nbd_client_new(NULL, fd, nbd_client_put);
|
2012-08-22 18:43:07 +04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void qmp_nbd_server_start(SocketAddress *addr, Error **errp)
|
|
|
|
{
|
|
|
|
if (server_fd != -1) {
|
|
|
|
error_setg(errp, "NBD server already running");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
server_fd = socket_listen(addr, errp);
|
|
|
|
if (server_fd != -1) {
|
Change qemu_set_fd_handler2(..., NULL, ...) to qemu_set_fd_handler
Done with following Coccinelle semantic patch, plus manual cosmetic changes in
net/*.c.
@@
expression E1, E2, E3, E4;
@@
- qemu_set_fd_handler2(E1, NULL, E2, E3, E4);
+ qemu_set_fd_handler(E1, E2, E3, E4);
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1433400324-7358-8-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-06-04 09:45:18 +03:00
|
|
|
qemu_set_fd_handler(server_fd, nbd_accept, NULL, NULL);
|
2012-08-22 18:43:07 +04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
|
|
|
|
Error **errp)
|
|
|
|
{
|
2014-11-18 14:21:17 +03:00
|
|
|
BlockBackend *blk;
|
2012-08-22 18:43:07 +04:00
|
|
|
NBDExport *exp;
|
|
|
|
|
2012-11-12 17:25:17 +04:00
|
|
|
if (server_fd == -1) {
|
|
|
|
error_setg(errp, "NBD server not running");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2012-08-22 18:43:07 +04:00
|
|
|
if (nbd_export_find(device)) {
|
|
|
|
error_setg(errp, "NBD server already exporting device '%s'", device);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2014-11-18 14:21:17 +03:00
|
|
|
blk = blk_by_name(device);
|
|
|
|
if (!blk) {
|
2015-03-16 10:57:47 +03:00
|
|
|
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
|
|
|
|
"Device '%s' not found", device);
|
2012-08-22 18:43:07 +04:00
|
|
|
return;
|
|
|
|
}
|
2014-11-18 14:21:17 +03:00
|
|
|
if (!blk_is_inserted(blk)) {
|
2015-03-17 13:54:50 +03:00
|
|
|
error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
|
2014-05-18 14:50:04 +04:00
|
|
|
return;
|
|
|
|
}
|
2012-08-22 18:43:07 +04:00
|
|
|
|
2012-11-04 15:43:37 +04:00
|
|
|
if (!has_writable) {
|
2012-11-28 14:46:39 +04:00
|
|
|
writable = false;
|
2012-11-04 15:43:37 +04:00
|
|
|
}
|
2014-11-18 14:21:17 +03:00
|
|
|
if (blk_is_read_only(blk)) {
|
2012-11-04 15:43:37 +04:00
|
|
|
writable = false;
|
|
|
|
}
|
|
|
|
|
2015-02-25 21:08:21 +03:00
|
|
|
exp = nbd_export_new(blk, 0, -1, writable ? 0 : NBD_FLAG_READ_ONLY, NULL,
|
|
|
|
errp);
|
|
|
|
if (!exp) {
|
|
|
|
return;
|
|
|
|
}
|
2012-08-22 18:43:07 +04:00
|
|
|
|
|
|
|
nbd_export_set_name(exp, device);
|
|
|
|
|
2016-01-29 18:36:06 +03:00
|
|
|
/* The list of named exports has a strong reference to this export now and
|
|
|
|
* our only way of accessing it is through nbd_export_find(), so we can drop
|
|
|
|
* the strong reference that is @exp. */
|
|
|
|
nbd_export_put(exp);
|
2012-08-22 18:43:07 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
void qmp_nbd_server_stop(Error **errp)
|
|
|
|
{
|
2016-01-29 18:36:06 +03:00
|
|
|
nbd_export_close_all();
|
2012-08-22 18:43:07 +04:00
|
|
|
|
2012-11-12 17:12:54 +04:00
|
|
|
if (server_fd != -1) {
|
Change qemu_set_fd_handler2(..., NULL, ...) to qemu_set_fd_handler
Done with following Coccinelle semantic patch, plus manual cosmetic changes in
net/*.c.
@@
expression E1, E2, E3, E4;
@@
- qemu_set_fd_handler2(E1, NULL, E2, E3, E4);
+ qemu_set_fd_handler(E1, E2, E3, E4);
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1433400324-7358-8-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-06-04 09:45:18 +03:00
|
|
|
qemu_set_fd_handler(server_fd, NULL, NULL, NULL);
|
2012-11-12 17:12:54 +04:00
|
|
|
close(server_fd);
|
|
|
|
server_fd = -1;
|
|
|
|
}
|
2012-08-22 18:43:07 +04:00
|
|
|
}
|