Bug 528500 - Linux Kernel no longer provides non-GPL access to gendisk partition information
Summary: Linux Kernel no longer provides non-GPL access to gendisk partition information
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 11
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2009-10-12 14:24 UTC by Derek Atkins
Modified: 2009-10-13 04:35 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2009-10-13 04:35:02 UTC
Type: ---

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Description Derek Atkins 2009-10-12 14:24:41 UTC
Description of problem:

I've got a proprietary kernel disk driver that needs to access the disk partition information in order to gather information like:

 * how many real partitions are there?
 * for each partition, what is the:
    - partition number?
    - starting offset?
    - size?

I used to be able to just iterate over the gendisk->part[] array, but as of 2.6.29 in F11 this array is now hidden behind a GPL-ONLY RCU interface and a GPL-ONLY iterator interface.

Version-Release number of selected component (if applicable):

kernel-2.6.29 and 2.6.30

How reproducible:


Steps to Reproduce:
1. write a non-GPL kernel module
2. try to find some way to access gendisk partition information
3. realize it's all GPL-Only now.
Actual results:

The partition data is all behind RCU which is GPL-Only... And the iterator functions are also GPL-Only..  Which effectively hides the partition array behind a GPL-Only interface whereas it used to be available.  So now there is no non-GPL way to access disk partitions.

Expected results:

Linux shouldn't hide data structures behind GPL-Only interfaces when those structures used to be accessible to non-GPL modules.

Additional info:

The quick fix would be to make the partition iterator interfaces available to non-GPL modules.  I think that would solve all the problems..  While it would be nice to be able to access the disk_get_part() API I could implement one if I had the iterator available.

Comment 1 Dave Jones 2009-10-13 04:35:02 UTC
This isn't something that Fedora changed, so this doesn't belong in Fedora bugzilla.  If you want this changed, you're going to have to get it done upstream at linux-kernel@vger.kernel.org

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