Hi Gaurav,
 I went through your blog and it is really informative. But after reading
that i realized that i have a question:
  If I want to write a block device driver which is going to sit on lvm
(and do some functionality on top of it) then should i go for the block
device driver api
  or write it as a device mapper target. What are the
advantages/disadvantages of both the approaches.

Regards,
Neha

On Tue, Apr 30, 2013 at 4:24 AM, Gaurav Mahajan <gauravmahajan2007@gmail.com

wrote:

Hi Amit,

I had compiled some notes on my blog.
Here are some links on writing your own device mapper target.
http://techgmm.blogspot.in/p/writing-your-own-device-mapper-target.html

Concept of device mapper target.
http://techgmm.blogspot.in/p/device-mapper-layer-explored-every.html

Thanks,
Gaurav.


On Tue, Apr 30, 2013 at 5:05 AM, Anatol Pomozov [off-list ref]wrote:

quoted

Hi

On Mon, Apr 29, 2013 at 9:51 AM, amit mehta [off-list ref] wrote:

quoted

On Sun, Apr 28, 2013 at 5:24 PM, Greg Freemyer [off-list ref]

wrote:

quoted

quoted

A nice diagram of the overall storage subsystem is at

http://www.thomas-krenn.com/en/oss/linux-io-stack-diagram.html

quoted

quoted

Dm is just a single block in it, but it can help to see where it fits

in overall.

quoted

quoted

Btw: that diagram doesn't show the legacy ata driver that creates

/dev/hdx style devices.  Has that been dropped while I wasn't paying
attention?  I haven't used it in years, but I thought it was still used on
embedded systems.

quoted

quoted

Thank you for sharing the link, but I'm looking for more
detailed information on I/O stack in Linux, dm-mapper and
multipath in particular.

Some docs about multipath can be found here

http://www.sourceware.org/lvm2/wiki/MultipathUsageGuide
http://christophe.varoqui.free.fr/refbook.html

The userspace part for tools is here
http://sourceware.org/lvm2/

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