Device mapper api v/s block device driver api

[Valdis.Kletnieks at vt.edu]

On Mon, 06 May 2013 13:37:50 -0600, neha naik said:

> What do you think?  What are the pros and cons of device mapper v/s block
> device driver

Block device driver does exactly one thing - provides a driver for a
a generic block device.  If all you need is a generic block device,
use this.

Device-mapper provides targets that do things other than a generic block
device.  Stuff like crypto support, logical block forwarding and mapping to
support things like LVM, multipath support, software raid, caching, etc.
Basically, look around in drivers/md at the already existing targets.

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