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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/*
* Copyright (c) 2021-2023 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "exec/ramblock.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "channel.h"
#include "file.h"
#include "migration.h"
#include "io/channel-file.h"
#include "io/channel-socket.h"
#include "io/channel-util.h"
#include "options.h"
#include "trace.h"
#define OFFSET_OPTION ",offset="
static struct FileOutgoingArgs {
char *fname;
} outgoing_args;
/* Remove the offset option from @filespec and return it in @offsetp. */
int file_parse_offset(char *filespec, uint64_t *offsetp, Error **errp)
{
char *option = strstr(filespec, OFFSET_OPTION);
int ret;
if (option) {
*option = 0;
option += sizeof(OFFSET_OPTION) - 1;
ret = qemu_strtosz(option, NULL, offsetp);
if (ret) {
error_setg_errno(errp, -ret, "file URI has bad offset %s", option);
return -1;
}
}
return 0;
}
void file_cleanup_outgoing_migration(void)
{
g_free(outgoing_args.fname);
outgoing_args.fname = NULL;
}
bool file_send_channel_create(gpointer opaque, Error **errp)
{
QIOChannelFile *ioc;
int flags = O_WRONLY;
bool ret = true;
ioc = qio_channel_file_new_path(outgoing_args.fname, flags, 0, errp);
if (!ioc) {
ret = false;
goto out;
}
multifd_channel_connect(opaque, QIO_CHANNEL(ioc));
out:
/*
* File channel creation is synchronous. However posting this
* semaphore here is simpler than adding a special case.
*/
multifd_send_channel_created();
return ret;
}
void file_start_outgoing_migration(MigrationState *s,
FileMigrationArgs *file_args, Error **errp)
{
g_autoptr(QIOChannelFile) fioc = NULL;
g_autofree char *filename = g_strdup(file_args->filename);
uint64_t offset = file_args->offset;
QIOChannel *ioc;
trace_migration_file_outgoing(filename);
fioc = qio_channel_file_new_path(filename, O_CREAT | O_WRONLY | O_TRUNC,
0600, errp);
if (!fioc) {
return;
}
outgoing_args.fname = g_strdup(filename);
ioc = QIO_CHANNEL(fioc);
if (offset && qio_channel_io_seek(ioc, offset, SEEK_SET, errp) < 0) {
return;
}
qio_channel_set_name(ioc, "migration-file-outgoing");
migration_channel_connect(s, ioc, NULL, NULL);
}
static gboolean file_accept_incoming_migration(QIOChannel *ioc,
GIOCondition condition,
gpointer opaque)
{
migration_channel_process_incoming(ioc);
object_unref(OBJECT(ioc));
return G_SOURCE_REMOVE;
}
void file_create_incoming_channels(QIOChannel *ioc, Error **errp)
{
int i, fd, channels = 1;
g_autofree QIOChannel **iocs = NULL;
if (migrate_multifd()) {
channels += migrate_multifd_channels();
}
iocs = g_new0(QIOChannel *, channels);
fd = QIO_CHANNEL_FILE(ioc)->fd;
iocs[0] = ioc;
for (i = 1; i < channels; i++) {
QIOChannelFile *fioc = qio_channel_file_new_dupfd(fd, errp);
if (!fioc) {
while (i) {
object_unref(iocs[--i]);
}
return;
}
iocs[i] = QIO_CHANNEL(fioc);
}
for (i = 0; i < channels; i++) {
qio_channel_set_name(iocs[i], "migration-file-incoming");
qio_channel_add_watch_full(iocs[i], G_IO_IN,
file_accept_incoming_migration,
NULL, NULL,
g_main_context_get_thread_default());
}
}
void file_start_incoming_migration(FileMigrationArgs *file_args, Error **errp)
{
g_autofree char *filename = g_strdup(file_args->filename);
QIOChannelFile *fioc = NULL;
uint64_t offset = file_args->offset;
trace_migration_file_incoming(filename);
fioc = qio_channel_file_new_path(filename, O_RDONLY, 0, errp);
if (!fioc) {
return;
}
if (offset &&
qio_channel_io_seek(QIO_CHANNEL(fioc), offset, SEEK_SET, errp) < 0) {
object_unref(OBJECT(fioc));
return;
}
file_create_incoming_channels(QIO_CHANNEL(fioc), errp);
}
int file_write_ramblock_iov(QIOChannel *ioc, const struct iovec *iov,
int niov, RAMBlock *block, Error **errp)
{
ssize_t ret = 0;
int i, slice_idx, slice_num;
uintptr_t base, next, offset;
size_t len;
slice_idx = 0;
slice_num = 1;
/*
* If the iov array doesn't have contiguous elements, we need to
* split it in slices because we only have one file offset for the
* whole iov. Do this here so callers don't need to break the iov
* array themselves.
*/
for (i = 0; i < niov; i++, slice_num++) {
base = (uintptr_t) iov[i].iov_base;
if (i != niov - 1) {
len = iov[i].iov_len;
next = (uintptr_t) iov[i + 1].iov_base;
if (base + len == next) {
continue;
}
}
/*
* Use the offset of the first element of the segment that
* we're sending.
*/
offset = (uintptr_t) iov[slice_idx].iov_base - (uintptr_t) block->host;
if (offset >= block->used_length) {
error_setg(errp, "offset %" PRIxPTR
"outside of ramblock %s range", offset, block->idstr);
ret = -1;
break;
}
ret = qio_channel_pwritev(ioc, &iov[slice_idx], slice_num,
block->pages_offset + offset, errp);
if (ret < 0) {
break;
}
slice_idx += slice_num;
slice_num = 0;
}
return (ret < 0) ? ret : 0;
}
int multifd_file_recv_data(MultiFDRecvParams *p, Error **errp)
{
MultiFDRecvData *data = p->data;
size_t ret;
ret = qio_channel_pread(p->c, (char *) data->opaque,
data->size, data->file_offset, errp);
if (ret != data->size) {
error_prepend(errp,
"multifd recv (%u): read 0x%zx, expected 0x%zx",
p->id, ret, data->size);
return -1;
}
return 0;
}
|
