[ evms-Bugs-1917266 ] dmsetup errors should report more detail

Bugs item #1917266, was opened at 2008-03-17 21:22
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Sebastian Rode (linuxuser_90)
Assigned to: Nobody/Anonymous (nobody)
Summary: dmsetup errors should report more detail

Initial Comment:
Out of https://bugs.launchpad.net/ubuntu/+source/evms/+bug/58283:

When my server rebooted last night, I found that the ubuntu kernels had lost their support for dm-bbr.

However, it was very hard to diagnose that because the only error reported was:

'device-mapper: unknown target type' - followed by evms failing.

When device mapper calls fail in this case error EINVAL is returned, and the caller (evms) should log somewhere - preferrably somewhere accessible during the initramfs failure environment - kmsg or console - what precise devicer mapper call it had made that had failed.

I'm not aware of anyone actively making dmsetup report it's errors more usefully.

I'm not suffering the root cause that prompted this bug report, so I can't actually tell either.

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