Device Mapper Query

Gaurav Mahajan gauravmahajan2007 at gmail.com
Fri Jul 20 12:59:00 EDT 2012


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
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20120720/f3671a3f/attachment.html 


More information about the Kernelnewbies mailing list