Device Mapper Query

[Gaurav Mahajan]

Hi  Satyajeet,

On Fri, Jul 20, 2012 at 7:52 PM, Satyajeet <satya.unplugged at gmail.com>wrote:

> Does the dmsetup <dm-dev> <table-file> command, calls the constructor* *
> dm_ctr_fn??

Yes.

> If yes what are the argv passed in the dm_ctr_fn, are they the args you
> pass to dmsetup??
>
True

> Is this constructor a callback from dm layer? when it is invoked and how
> it is invoked?
>

Dm layer registers a fops when ever a new device mapper target is
registered.
So whenever a new device is created then dm refer the fops and call the
respective functions.

To start learning more you can start looking into linear target's code.

Regards,
Gaurav Mahajan.


> Replies will be appreciated.
>
> Regards,
> satyajeet
>
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