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

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Message-ID: <20190320161708.GA32021@mit.edu>
Date:   Wed, 20 Mar 2019 12:17:08 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Lukas Czerner <lczerner@...hat.com>
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 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

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

Speaking of thinpools, although we *can* take a thick snapshot of a
thinp volume, in the future we might want to add support for taking a
thinp snapshot.  (Although that will make the check which I've been
working on to make sure there's enough free space a bit more
complicated.)

I have some other patches queued for e2scrub, so I'll take a whack and
trying to make a reivison of this patch, and then send out a stack of
patches against e2scrub for folks to look at.

			    	     	  - Ted