Question: multiple major numbers - one driver

Question: multiple major numbers - one driver

[chris parker]

I have a need for more than 256 minor numbers.  I could add some 
more major numbers, thus getting the number of majors * 256.
I would like to have only device driver loaded to handle the
multiple majors.
I thoought of the following things that would have to be changed: 

1) make the new device descriptors
2) add the new majors to the register_blkdev and unregister
   system calls
3) process multiple CURRENT q's when receiving a request 
   from the block device layer. Each unique major has
   a seperate incoming q.

   Does any know of anything else that would prevent me from doing 
   this ??

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Re: Question: multiple major numbers - one driver

[Andreas Dilger]

Chris Parker writes:
> I have a need for more than 256 minor numbers.  I could add some 
> more major numbers, thus getting the number of majors * 256.
> I would like to have only device driver loaded to handle the
> multiple majors.

Look at the SCSI/IDE/COMPAQ Smart RAID/etc drivers that have multiple
major numbers registered (per Documentation/devices.txt).  Some of
the storage drivers have been allocating blocks of 8 major numbers at
a time.

Cheers, Andreas
-- 
Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert
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