[linux-lvm] commit c527a0cbfc3 may have a bug

Gionatan Danti g.danti at assyoma.it
Sat Feb 15 19:07:46 UTC 2020

Il 2020-02-14 21:40 David Teigland ha scritto:
> You're right, filters are difficult to understand and use correctly.  
> The
> complexity and confusion in the code is no better.  With the removal of
> lvmetad in 2.03 versions (e.g. RHEL8) there's no difference between 
> filter
> and global_filter, so that's some small improvement.  But, I think 
> filters
> should be replaced or overhauled with something easier to use and more
> useful at a technical level.
> I've created a bz about that and welcome thoughts about what a 
> replacement
> should or should not be like.  With input the work is more likely to be
> prioritized.
> https://bugzilla.redhat.com/show_bug.cgi?id=1803266

Hi David, I think that part of the problem is the unclear/vague 
description of filters (eg: "plain" filter vs global_filter). In other 
words, maybe the real problem is a documentation one.

For example: am I right saying that global_filter were introduced as a 
"fail-safe" mechanism to protect udev & the likes by 
command-line-overwritten "plain" filter directive?

If so, I am not sure the comment in lvm.conf fully convey this message 
(and I can not find much on man pages, also). If not, and I am wrong 
about filter vs global_filter, then, well, this somewhat proves the 
point above :)


Danti Gionatan
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