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device-mapper & bd_claim

DISCUSSION Martin Waitz 2 participants 2 messages Oct 24, 2003

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Martin Waitz

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#0 lore raw

hi :)

i use evms to mount some filesystems.
the root filesystem is located on /dev/hda1, all other partitions are managed by evms.

this works without problems in 2.4.
however, evms refuses to create the logical volumes in 2.6.

the problem seems to be the addition of bd_claim in 2.6:
upon mounting the root filesystem, hda1 is claimed by the filesystem. thus, hda is claimed by the bd_claim code, too.
evms tries to setup dm-tables using hda and fails to claim the device

so, how should this be solved?
i think it should be allowed to mix evms and 'normal' partitions on the same device.

do we need to introduce claimed_region of the toplevel device instead of claiming individual devices?

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CU,		  / Friedrich-Alexander University Erlangen, Germany
Martin Waitz	//  Department of Computer Science 3       _________
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#1 lore raw
Quoted 14 lines · Martin Waitz

hi :)

i use evms to mount some filesystems.
the root filesystem is located on /dev/hda1, all other partitions are managed by evms.

this works without problems in 2.4.
however, evms refuses to create the logical volumes in 2.6.

the problem seems to be the addition of bd_claim in 2.6:
upon mounting the root filesystem, hda1 is claimed by the filesystem. thus, hda is claimed by the bd_claim code, too.
evms tries to setup dm-tables using hda and fails to claim the device

Quoted 6 lines

so, how should this be solved?
i think it should be allowed to mix evms and 'normal' partitions on the same device.

do we need to introduce claimed_region of the toplevel device instead of claiming individual devices?

Please see the notes at the top of:
http://evms.sourceforge.net/patches/2.1.1/kernel/2.6.0-test8/bd_claim.patch

In general, if you want to "mix" users of a device, you'll just need to revert that patch. But this isn't the preferred solution. If you're using EVMS, ideally you should switch to using EVMS for all your volumes and partitions. Getting your root filesystem mounted through EVMS isn't terribly difficult, and you can find more details about it at:
http://evms.sourceforge.net/install/root.html

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Kevin Corry
[email protected]
http://evms.sourceforge.net/