Implement cache connect/disconnect#1760
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Signed-off-by: Robert Baldyga <robert.baldyga@unvertical.com>
Signed-off-by: Robert Baldyga <robert.baldyga@unvertical.com>
Signed-off-by: Robert Baldyga <robert.baldyga@unvertical.com>
Implement a box service that allows to temporarily deposit an exported object. It is useful for cas_cache module updates without stopping the exported objects. Signed-off-by: Robert Baldyga <robert.baldyga@unvertical.com>
Allow to disconnect a cache completely without dismantling exported objects and freeing the disks. The disconnect operation deposits all the exp_objs in the cas_bd box service and sets them to freeze or pass-through mode. Once all the caches are disconnected, it is possible to unload cas_cache module, while keeping all the /dev/casX-Y devices functional. This mode is meant to be used for OpenCAS version upgrade. Signed-off-by: Robert Baldyga <robert.baldyga@unvertical.com>
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