Hi, I'm writing a virtual disk driver consisting of serveral real disks. Hence I've to map read/write requests for my virtual device to underlying real devices, like md does so for RAID-Arrays. So my question is how a virtual device driver (like 'md') manages the read/write request associated with a virtual (md-) device to get data from a specific real device within a 'block_read/block/write()' invokation ! I know that the buffer head-structure contains an entry for a virtual and a real device, but i don't know when and in which proper way to set these components. Somebody to help me ?? Mario Vodisek
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