linux-ext4 - Re: [PATCH] e2scrub_all: refactor device probe loop

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Message-ID: <20190321101521.pej52dcrvf635gt2@work>
Date:   Thu, 21 Mar 2019 11:15:21 +0100
From:   Lukas Czerner <lczerner@...hat.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-ext4@...r.kernel.org, Paul Menzel <pmenzel@...gen.mpg.de>
Subject: Re: [PATCH] e2scrub_all: refactor device probe loop

On Wed, Mar 20, 2019 at 12:17:08PM -0400, Theodore Ts'o wrote:
> On Tue, Mar 19, 2019 at 11:58:24AM +0100, Lukas Czerner wrote:
> > >  # Find scrub targets, make sure we only do this once.
> > > -ls_scrub_targets() {
> > > -	lsblk -o NAME,FSTYPE,MOUNTPOINT -p -P -n | while read vars; do
> > > +ls_scan_targets() {
> > > +	lvs --name-prefixes -o vg_name,lv_name,lv_path \
> > > +			-S lv_active=active,lv_role=public --noheadings | \
> > 
> > You're not using vg_name, nor lv_name so you can drop it maybe ? Also
> > you're missing lv_role since you're checking it later, however you can
> > do this instead
> > 
> > 	-S lv_active=active,lv_role=public -S lv_role!=snapshot
> 
> We don't need to check lv_role at all, since the command already
> included:
> 
> 	-S lv_active=active,lv_role=public

You actually need to check the lv_role for snapshot, because snapshot can
be "public" as well.

> 
> And we need to do lv_role=public and not lv_role!=snapshot, since we
> need to also exclude thinpools.

No, you need to check both if you want to exclude snapshots.


I think that specifying -S twice tricked you, sorry about that. But
again you can do:

	-S lv_active=active,lv_role=public,lv_role!=snapshot

Thanks!
-Lukas