1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
/*
* QEMU live migration
*
* Copyright IBM, Corp. 2008
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu-common.h"
#include "qemu_socket.h"
#include "migration.h"
#include "qemu-char.h"
#include "buffered_file.h"
#include "block.h"
//#define DEBUG_MIGRATION_TCP
#ifdef DEBUG_MIGRATION_TCP
#define DPRINTF(fmt, ...) \
do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
static int socket_errno(MigrationState *s)
{
return socket_error();
}
static int socket_write(MigrationState *s, const void * buf, size_t size)
{
return send(s->fd, buf, size, 0);
}
static int tcp_close(MigrationState *s)
{
int r = 0;
DPRINTF("tcp_close\n");
if (s->fd != -1) {
if (close(s->fd) < 0) {
r = -errno;
}
s->fd = -1;
}
return r;
}
static void tcp_wait_for_connect(int fd, void *opaque)
{
MigrationState *s = opaque;
if (fd < 0) {
DPRINTF("migrate connect error\n");
s->fd = -1;
migrate_fd_error(s);
} else {
DPRINTF("migrate connect success\n");
s->fd = fd;
migrate_fd_connect(s);
}
}
void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp)
{
s->get_error = socket_errno;
s->write = socket_write;
s->close = tcp_close;
s->fd = inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, errp);
}
static void tcp_accept_incoming_migration(void *opaque)
{
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
int s = (intptr_t)opaque;
QEMUFile *f;
int c;
do {
c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
} while (c == -1 && socket_error() == EINTR);
DPRINTF("accepted migration\n");
if (c == -1) {
fprintf(stderr, "could not accept migration connection\n");
goto out2;
}
f = qemu_fopen_socket(c);
if (f == NULL) {
fprintf(stderr, "could not qemu_fopen socket\n");
goto out;
}
process_incoming_migration(f);
qemu_fclose(f);
out:
close(c);
out2:
qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
close(s);
}
void tcp_start_incoming_migration(const char *host_port, Error **errp)
{
int s;
s = inet_listen(host_port, NULL, 256, SOCK_STREAM, 0, errp);
if (s < 0) {
return;
}
qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
(void *)(intptr_t)s);
}
|
