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[dm-devel] device mapper v/s block device driver



Hi,
  There is no clear documentation available on the net about the scenarios in which device mapper should be used and why block device driver cannot work there.

  So, i am posting this question directly to the device mapper community  :
      One can write a block device driver which intercepts io , puts it in its own biolist, takes action and then passes it to the block device driver below it.
      (in the form of stackable block device driver) The same can be done with the help of device mapper target. Then which should be used ?
       Are there any advantages of using block device driver instead of device mapper (or vice versa)


Regards,
Neha
 

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