linux-ext4 - Re: [PATCH 8/9] e2scrub_all: refactor device probe loop

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Date:   Fri, 22 Mar 2019 10:38:11 +0100
From:   Lukas Czerner <lczerner@...hat.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Ext4 Developers List <linux-ext4@...r.kernel.org>,
        darrick.wong@...cle.com
Subject: Re: [PATCH 8/9] e2scrub_all: refactor device probe loop

On Thu, Mar 21, 2019 at 06:08:19PM -0400, Theodore Ts'o wrote:
> On Thu, Mar 21, 2019 at 06:04:40PM -0400, Theodore Ts'o wrote:
> > OK, I've reworked the function to read:
> > 
> > ls_scan_targets() {
> > 	lsblk -o NAME,MOUNTPOINT,FSTYPE -P -n -p \
> > 	      $(lvs -o lv_path --noheadings -S "lv_active=active,lv_role=public,lv_role!=snapshot,vg_free>${snap_size_mb}") | \
> > 	    grep FSTYPE=\"ext\[234\]\" | while read vars ; do
> > 		eval "${vars}"
> > 
> > 		if [ "${scrub_all}" -eq 1 ] || [ -n "${MOUNTPOINT}" ]; then
> > 		    echo ${MOUNTPOINT:-${NAME}}
> > 		fi
> > 	done | sort | uniq
> > }
> > 
> > I think that's the final answer....
> 
> And I just saw your e-mail about dropping the sort and uniq calls.
> OK, I'll take care of that too.
> 
> 					- Ted

Great, I like it and it runs very fast on my system.

cold cache
real	0m0.268s
user	0m0.011s
sys	0m0.036s

second run
real	0m0.053s
user	0m0.013s
sys	0m0.031s

Thanks for working on this.
-Lukas