[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PULL 09/20] migration: Add migrate_add_blocker_internal()
From: Peter Xu <peterx@xxxxxxxxxx> An internal version that removes -only-migratable implications. It can be used for temporary migration blockers like dump-guest-memory. Reviewed-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx> Reviewed-by: Juan Quintela <quintela@xxxxxxxxxx> Signed-off-by: Peter Xu <peterx@xxxxxxxxxx> Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx> --- include/migration/blocker.h | 16 ++++++++++++++++ migration/migration.c | 21 +++++++++++++-------- 2 files changed, 29 insertions(+), 8 deletions(-) diff --git a/include/migration/blocker.h b/include/migration/blocker.h index acd27018e9..9cebe2ba06 100644 --- a/include/migration/blocker.h +++ b/include/migration/blocker.h @@ -25,6 +25,22 @@ */ int migrate_add_blocker(Error *reason, Error **errp); +/** + * @migrate_add_blocker_internal - prevent migration from proceeding without + * only-migrate implications + * + * @reason - 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(). + */ +int migrate_add_blocker_internal(Error *reason, Error **errp); + /** * @migrate_del_blocker - remove a blocking error from migration * diff --git a/migration/migration.c b/migration/migration.c index e81e473f5a..e1c0082530 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -2049,15 +2049,8 @@ void migrate_init(MigrationState *s) s->threshold_size = 0; } -int migrate_add_blocker(Error *reason, Error **errp) +int migrate_add_blocker_internal(Error *reason, Error **errp) { - if (only_migratable) { - error_propagate_prepend(errp, error_copy(reason), - "disallowing migration blocker " - "(--only-migratable) for: "); - return -EACCES; - } - /* Snapshots are similar to migrations, so check RUN_STATE_SAVE_VM too. */ if (runstate_check(RUN_STATE_SAVE_VM) || !migration_is_idle()) { error_propagate_prepend(errp, error_copy(reason), @@ -2070,6 +2063,18 @@ int migrate_add_blocker(Error *reason, Error **errp) return 0; } +int migrate_add_blocker(Error *reason, Error **errp) +{ + if (only_migratable) { + error_propagate_prepend(errp, error_copy(reason), + "disallowing migration blocker " + "(--only-migratable) for: "); + return -EACCES; + } + + return migrate_add_blocker_internal(reason, errp); +} + void migrate_del_blocker(Error *reason) { migration_blockers = g_slist_remove(migration_blockers, reason); -- 2.33.1
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