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/*
* QEMU migration blockers
*
* 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.
*
*/
#ifndef MIGRATION_BLOCKER_H
#define MIGRATION_BLOCKER_H
/**
* @migrate_add_blocker - prevent migration from proceeding
*
* @reasonp - address of an error to be returned whenever migration is attempted
*
* @errp - [out] The reason (if any) we cannot block migration right now.
*
* @returns - 0 on success, -EBUSY/-EACCES on failure, with errp set.
*
* *@reasonp is freed and set to NULL if failure is returned.
* On success, the caller must not free @reasonp, except by
* calling migrate_del_blocker.
*/
int migrate_add_blocker(Error **reasonp, Error **errp);
/**
* @migrate_add_blocker_internal - prevent migration from proceeding without
* only-migrate implications
*
* @reasonp - address of an error to be returned whenever migration is attempted
*
* @errp - [out] The reason (if any) we cannot block migration right now.
*
* @returns - 0 on success, -EBUSY on failure, with errp set.
*
* Some of the migration blockers can be temporary (e.g., for a few seconds),
* so it shouldn't need to conflict with "-only-migratable". For those cases,
* we can call this function rather than @migrate_add_blocker().
*
* *@reasonp is freed and set to NULL if failure is returned.
* On success, the caller must not free @reasonp, except by
* calling migrate_del_blocker.
*/
int migrate_add_blocker_internal(Error **reasonp, Error **errp);
/**
* @migrate_del_blocker - remove a blocking error from migration and free it.
*
* @reasonp - address of the error blocking migration
*
* This function frees *@reasonp and sets it to NULL.
*/
void migrate_del_blocker(Error **reasonp);
#endif
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