linux-ext4 - Re: [PATCH 2/7] e2scrub: create a script to scrub all ext* filesystems

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Message-Id: <254C3560-67C3-4A7A-A1AC-3A04ED7828AB@dilger.ca>
Date:   Thu, 1 Mar 2018 15:42:52 -0700
From:   Andreas Dilger <adilger@...ger.ca>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     tytso@....edu, djwong@...nel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/7] e2scrub: create a script to scrub all ext*
 filesystems

On Mar 1, 2018, at 11:23 AM, Darrick J. Wong <darrick.wong@...cle.com> wrote:
> 
> From: Darrick J. Wong <darrick.wong@...cle.com>
> 
> Create an e2scrub_all command to find all ext* filesystems
> and run an online scrub against them all.

Is fstrim a no-op on HDD and SSD devices that don't support it?

> diff --git a/scrub/e2scrub_all.8.in b/scrub/e2scrub_all.8.in
> new file mode 100644
> index 0000000..a57d4aa
> --- /dev/null
> +++ b/scrub/e2scrub_all.8.in
> @@ -0,0 +1,14 @@
> +.TH E2SCRUB 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
> +.SH NAME
> +e2scrub_all - Check all mounted btrfs/ext4/XFS LVM file systems for errors.

Does it actually check btrfs/XFS filesystems?  I'd guess not.

> diff --git a/scrub/e2scrub_all.in b/scrub/e2scrub_all.in
> new file mode 100644
> index 0000000..ff9eb8f
> --- /dev/null
> +++ b/scrub/e2scrub_all.in
> @@ -0,0 +1,57 @@
> +#!/bin/bash
> +
> +#  Copyright (C) 2018 Oracle.  All Rights Reserved.
> +#
> +#  Author: Darrick J. Wong <darrick.wong@...cle.com>
> +#
> +#  This program is free software; you can redistribute it and/or
> +#  modify it under the terms of the GNU General Public License
> +#  as published by the Free Software Foundation; either version 2
> +#  of the License, or (at your option) any later version.
> +#
> +#  This program is distributed in the hope that it would be useful,
> +#  but WITHOUT ANY WARRANTY; without even the implied warranty of
> +#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +#  GNU General Public License for more details.
> +#
> +#  You should have received a copy of the GNU General Public License
> +#  along with this program; if not, write the Free Software Foundation,
> +#  Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
> +
> +# Check all ext[234] filesystems mounted on LVM
> +types="ext2,ext3,ext4"
> +
> +exitcode() {
> +	ret="$1"
> +
> +	exit "${ret}"
> +}

I don't understand the benefit of this at all...  Why not "exit" directly?

> +prog_path() {
> +	path="$1"
> +	displayname="$2"
> +
> +	if ! type -P "${path}" && [ -n "${displayname}" ]; then
> +		echo "${displayname}: Command not found."
> +		exitcode 8
> +	fi
> +}
> +
> +LVS_PROG="$(prog_path "@root_sbindir@...s" "lvs")"
> +BLKID_PROG="$(prog_path "@root_sbindir@...kid" "blkid")"

This is confusing.  You are forcing the path to be one thing, then failing if
the command is not at the fully-specified path.  Why not just use:

PATH=/bin:/sbin:/usr/bin:/usr/sbin

lvs ...
blkid ...

and then no need to make the script ugly by using $LVS_PROG and $BLKID_PROG
everywhere, secondly it will work regardless of where the programs are installed
(for any sane system), and finally no need to subst every one of your scripts.

Cheers, Andreas

> +
> +# Scrub any fs on lvm by creating a snapshot and fscking that.
> +"${LVS_PROG}" -o vg_name,lv_name,lv_role --noheadings 2> /dev/null | while read vg lv role extra; do
> +	# parsing error?
> +	test -n "${extra}" && continue
> +	# Skip snapshots
> +	echo "${role}" | grep -q "snapshot" && continue
> +
> +	dev="/dev/${vg}/${lv}"
> +	# Skip non-ext[234]
> +	"${BLKID_PROG}" -p -n "${types}" "${dev}" > /dev/null 2>&1 || continue
> +
> +	${DBG} "@root_sbindir@...scrub" "${dev}"
> +done
> +
> +exitcode 0
> 


Cheers, Andreas






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