[Crash-utility] dev command deteriorates with new kernels

[Dave Anderson]

----- "Bob Montgomery" <bob.montgomery at hp.com> wrote:

> When I tried the dev command and it bombed at the chrdev stuff before
> getting to the blkdev stuff, I was motivated to get it going enough to
> see if it would help answer my question, but it doesn't print anything
> (like hd_struct pointers) that could help me with my problem.  But I
> figured someone had once wanted that device info, so it might as well
> work...

Re: your quest to find an hd_struct, perhaps the command could be made a
bit more useful in that respect as well.

For character devices, the cdev_map.probes[255] probe structure's
"data" field points to a cdev structure, where the file_operations 
pointer is found.

For block devices, the bdev_map.probes[255] probe structure's
"data" field points to a gendisk structure, where the file_operations 
pointer is found.  But the gendisk structure also has an embedded
hd_struct, which is presumably what you were looking for?

If that's the case, then maybe the command should display the address 
of the cdev or gendisk structures associated with the device?

Dave