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migration: simplify blockers

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Modify migrate_add_blocker and migrate_del_blocker to take an Error **
reason.  This allows migration to own the Error object, so that if
an error occurs in migrate_add_blocker, migration code can free the Error
and clear the client handle, simplifying client code.  It also simplifies
the migrate_del_blocker call site.

In addition, this is a pre-requisite for a proposed future patch that would
add a mode argument to migration requests to support live update, and
maintain a list of blockers for each mode.  A blocker may apply to a single
mode or to multiple modes, and passing Error** will allow one Error object
to be registered for multiple modes.

No functional change.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Tested-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <1697634216-84215-1-git-send-email-steven.sistare@oracle.com>
This commit is contained in:
Steve Sistare 2023-10-18 06:03:36 -07:00 • committed by Juan Quintela
parent 04131e0009
commit c8a7fc5179
33 changed files with 92 additions and 150 deletions
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9
block/parallels.c
View file

@ -1369,9 +1369,8 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
bdrv_get_device_or_node_name(bs));
bdrv_graph_rdunlock_main_loop();
ret = migrate_add_blocker(s->migration_blocker, errp);
ret = migrate_add_blocker(&s->migration_blocker, errp);
if (ret < 0) {
error_setg(errp, "Migration blocker error");
goto fail;
}
qemu_co_mutex_init(&s->lock);
@ -1406,7 +1405,7 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
ret = bdrv_check(bs, &res, BDRV_FIX_ERRORS | BDRV_FIX_LEAKS);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not repair corrupted image");
migrate_del_blocker(s->migration_blocker);
migrate_del_blocker(&s->migration_blocker);
goto fail;
}
}
@ -1423,7 +1422,6 @@ fail:
*/
parallels_free_used_bitmap(bs);
error_free(s->migration_blocker);
g_free(s->bat_dirty_bmap);
qemu_vfree(s->header);
return ret;
@ -1448,8 +1446,7 @@ static void parallels_close(BlockDriverState *bs)
g_free(s->bat_dirty_bmap);
qemu_vfree(s->header);
migrate_del_blocker(s->migration_blocker);
error_free(s->migration_blocker);
migrate_del_blocker(&s->migration_blocker);
}
static bool parallels_is_support_dirty_bitmaps(BlockDriverState *bs)