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| | /* 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_header - Migration header from source
* @magic: 0xB1BB1D1B0BB1D1B0, network order
* @version: Highest known, target aborts if too old, network order
* @compat_version: Lowest version compatible with @version, target aborts
* if too new, network order
*/
struct migrate_header {
uint64_t magic;
uint32_t version;
uint32_t compat_version;
} __attribute__((packed));
/**
* 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
* @iov: Optional data section to transfer
*/
struct migrate_stage {
const char *name;
int (*source)(struct ctx *c,
const struct migrate_stage *stage, int fd);
int (*target)(struct ctx *c,
const struct migrate_stage *stage, int fd);
/* FIXME: rollback callbacks? */
struct iovec iov;
};
/**
* struct migrate_version - Stages for a particular protocol version
* @id: Version number, host order
* @s: Ordered array of stages, NULL-terminated
*/
struct migrate_version {
uint32_t id;
const struct migrate_stage *s;
};
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);
void migrate_finish(struct ctx *c);
#endif /* MIGRATE_H */
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