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Partition problem

Partition problem

Posted Mar 19, 2004 14:41 UTC (Fri) by corbet (editor, #1)
In reply to: Partition problem by giraffedata
Parent article: Lots of SCSI disks

Block drivers are blissfully ignorant of partitions - in 2.6. Occasionally somebody brings up the idea of moving partition handling out entirely, all the way to user space. That probably will not happen, though; things like booting from an arbitrary partition get increasingly hard when you do that.

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Partition problem

Posted Mar 19, 2004 17:01 UTC (Fri) by giraffedata (subscriber, #1954) [Link]

They're not totally ignorant, or it wouldn't have come up here. The SCSI disk driver (sd) has to be aware enough of the existence of partitions to allocate exactly 16 minor numbers for each physical device. If partitions were instead handled by a separate device driver with a separate major number, LVM style, we wouldn't be worrying about how many bits to reserve for partitions.

I can't imagine how partitions could be moved all the way out to user space and maintain any significant part of their value.

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