Apple

Hi Mike,

I want to write a generic IOBlockStorageDriver which gets loaded with the default IOBlockStorageDriver of Mac OS X.

I want to write IOBlockStorageDriver so that I can override the read/write request of the default IOBlockStorageDriver. My IOBlockStorageDriver do the read/write which is specific to my requirements.

Actually, In my IOBlockStorageDriver I will override the read/write routines of the driver so that I can write on multiple disks in a single write call of my IOBlockStorageDriver.Is it possible to write on multiple disks in a single write call of IOBlockStorageDriver? Does IOBlockStorageDriver have this kind of interface where the driver should be able to write on multiple disks in a single write call of IOBlockStorageDriver??

Please suggest some pointers so that I can understand the mechanism of IOBlockStorageDriver.

Thanks in advance,

Regards,

Mekhala

From: Mike Smith [mailto:email@hidden]
Sent: Wednesday, February 08, 2006 12:26 AM
To: Mekhala Patil
Cc: email@hidden
Subject: Re: how to write and override IOBlockStorageDriver???

On Feb 7, 2006, at 6:24 AM, Mekhala Patil wrote:

I want to write IOBlockStorageDriver to trap/overload the read/write request.

I would like to know from where should I start??? I have downloaded IOATABlockStorageDriver code from Darwin site. But after going through ioregistry I came to know that IOATABlockStorageDriver is layered below IOBlockStorageDriver which converts ATA specific read/write requests to generic read/write requests.

Whereas I want to write IOBlockStorageDriver for SCSI devices.

It's not quite clear what you mean here.

Are you attempting to write a driver for a SCSI controller? Or are you trying to intercept block I/Os, but only to SCSI devices?

= Mike