| config COWLOOP | |
| tristate "copy-on-write pseudo Block Driver" | |
| depends on BLOCK | |
| default n | |
| ---help--- | |
| Cowloop is a "copy-on-write" pseudo block driver. It can be | |
| stacked on top of a "real" block driver, and catches all write | |
| operations on their way from the file systems layer above to | |
| the real driver below, effectively shielding the lower driver | |
| from those write accesses. The requests are then diverted to | |
| an ordinary file, located somewhere else (configurable). Later | |
| read requests are checked to see whether they can be serviced | |
| by the "real" block driver below, or must be pulled in from | |
| the diverted location. More information and userspace tools to | |
| use the driver are on the project's website | |
| http://www.ATComputing.nl/cowloop/ |