Re: map gendisk (or blockdev) -> scsi_device

[Edward Falk <efalk@google.com>]

> You should revisit your code to not need access to the scsi_device
> structure, and follow the layering of the block and scsi subsystems.

Maybe I should explain what I'm trying to do here.

Some of our software reads some of the values in /proc/ide/hda/.  We're 
porting this facility to libata-based drivers in 2.6 and moving it to 
/sysfs/block/sda/.  The sysfs show() functions will be given pointers to 
gendisk structures but will need to obtain information from the 
associated scsi_device structure.

Does anybody have any suggestions as to the "right" way to proceed?


meta:

I understand the layering of block vs scsi and so on, but I wonder why 
there's so much isolation in the kernel.  Why should it be impossible to 
obtain the gendisk structure from the scsi_device structure, or to 
obtain the block_device structure from the gendisk?

   -ed falk