Re: Device Mapper Query

[Gaurav Mahajan <gauravmahajan2007@xxxxxxxxx>]

Hi  Satyajeet,

On Fri, Jul 20, 2012 at 7:52 PM, Satyajeet <satya.unplugged@xxxxxxxxx> 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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