How to enumerate block devices in a kernel module

[Jerome Steunenberg <jerome@xxxxxxxxxxxxxxx>]

Hello,

I'm trying to enumerate registered block devices, from a kernel module, 
like it's done in drivers/block/genhd.c (the seq functions that output 
/proc/diskstats)
genhd.c uses a static struct subsystem block_subsys but it's static so I 
can't access it from a module.
How do I enumerate the kset of block devices ?
Is there a global variable somewhere for accessing the kobjects of the 
block subsystem ?

Thanks,

Jerome Steunenberg

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