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
| | /* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright (c) 2025 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#ifndef MIGRATE_H
#define MIGRATE_H
struct migrate_version;
/**
* struct migrate_meta - Migration metadata
* @version: Chosen migration data version, host order
* @v: Migration version information
* @bswap: Source has opposite endianness
* @peer_64b: Source uses 64-bit void *
* @time_64b: Source uses 64-bit time_t
* @flow_size: Size of union flow in source
* @flow_sidx_size: Size of struct flow_sidx in source
*/
struct migrate_meta {
uint32_t version;
const struct migrate_version *v;
bool bswap;
bool source_64b;
bool time_64b;
size_t flow_size;
size_t flow_sidx_size;
};
/**
* union migrate_header - Migration header from source
* @magic: 0xB1BB1D1B0BB1D1B0, host order
* @version: Source sends highest known, target aborts if unsupported
* @voidp_size: sizeof(void *), network order
* @time_t_size: sizeof(time_t), network order
* @flow_size: sizeof(union flow), network order
* @flow_sidx_size: sizeof(struct flow_sidx_t), network order
* @unused: Go figure
*/
union migrate_header {
struct {
uint64_t magic;
uint32_t version;
uint32_t voidp_size;
uint32_t time_t_size;
uint32_t flow_size;
uint32_t flow_sidx_size;
};
uint8_t unused[4096];
} __attribute__((packed));
struct migrate_stage;
/**
* migrate_cb_t - Callback function to implement one migration stage
*/
typedef int (*migrate_cb_t)(struct ctx *c, struct migrate_meta *m,
const struct migrate_stage *stage, int fd);
/**
* struct migrate_stage - Callbacks and parameters for one stage of migration
* @name: Stage name (for debugging)
* @source: Callback to implement this stage on the source
* @target: Callback to implement this stage on the target
* @v: Source version this applies to, host order
* @sections: Array of data sections, NULL-terminated
*/
struct migrate_stage {
const char *name;
migrate_cb_t source;
migrate_cb_t target;
/* FIXME: rollback callbacks? */
union {
struct iovec iov;
};
};
/**
* struct migrate_version - Stages for a particular protocol version
* @version: Version number this implements
* @stages: Ordered array of stages
* @nstages: Length of @stages
*/
struct migrate_version {
uint32_t version;
const struct migrate_stage *stages;
unsigned nstages;
};
void migrate_init(struct ctx *c);
void migrate_close(struct ctx *c);
void migrate_request(struct ctx *c, int fd, bool target);
void migrate_handler(struct ctx *c, uint32_t events);
#endif /* MIGRATE_H */
|