mirror of https://github.com/proxmox/mirror_qemu
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/*
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* QEMU migration blockers
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef MIGRATION_BLOCKER_H
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#define MIGRATION_BLOCKER_H
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/**
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* @migrate_add_blocker - prevent migration from proceeding
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*
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* @reasonp - address of an error to be returned whenever migration is attempted
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*
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* @errp - [out] The reason (if any) we cannot block migration right now.
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*
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* @returns - 0 on success, -EBUSY/-EACCES on failure, with errp set.
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*
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* *@reasonp is freed and set to NULL if failure is returned.
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* On success, the caller must not free @reasonp, except by
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* calling migrate_del_blocker.
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*/
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int migrate_add_blocker(Error **reasonp, Error **errp);
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/**
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* @migrate_add_blocker_internal - prevent migration from proceeding without
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* only-migrate implications
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*
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* @reasonp - address of an error to be returned whenever migration is attempted
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*
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* @errp - [out] The reason (if any) we cannot block migration right now.
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*
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* @returns - 0 on success, -EBUSY on failure, with errp set.
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*
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* Some of the migration blockers can be temporary (e.g., for a few seconds),
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* so it shouldn't need to conflict with "-only-migratable". For those cases,
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* we can call this function rather than @migrate_add_blocker().
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*
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* *@reasonp is freed and set to NULL if failure is returned.
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* On success, the caller must not free @reasonp, except by
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* calling migrate_del_blocker.
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*/
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int migrate_add_blocker_internal(Error **reasonp, Error **errp);
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/**
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* @migrate_del_blocker - remove a blocking error from migration and free it.
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*
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* @reasonp - address of the error blocking migration
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*
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* This function frees *@reasonp and sets it to NULL.
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*/
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void migrate_del_blocker(Error **reasonp);
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#endif
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