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

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Date:   Thu, 01 Mar 2018 10:23:42 -0800
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     tytso@....edu, darrick.wong@...cle.com
Cc:     djwong@...nel.org, linux-ext4@...r.kernel.org
Subject: [PATCH 2/7] e2scrub: create a script to scrub all ext* filesystems

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.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 scrub/Makefile.in      |    9 ++++++--
 scrub/e2scrub_all.8.in |   14 ++++++++++++
 scrub/e2scrub_all.in   |   57 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+), 2 deletions(-)
 create mode 100644 scrub/e2scrub_all.8.in
 create mode 100644 scrub/e2scrub_all.in


diff --git a/scrub/Makefile.in b/scrub/Makefile.in
index a8bb06b..1744941 100644
--- a/scrub/Makefile.in
+++ b/scrub/Makefile.in
@@ -11,8 +11,8 @@ INSTALL = @INSTALL@
 
 @MCONFIG@
 
-PROGS=		e2scrub
-MANPAGES=	e2scrub.8
+PROGS=		e2scrub e2scrub_all
+MANPAGES=	e2scrub.8 e2scrub_all.8
 CONFFILES=	e2scrub.conf
 
 ifeq ($(HAVE_UDEV),yes)
@@ -29,6 +29,11 @@ e2scrub: $(DEP_SUBSTITUTE) e2scrub.in
 	$(Q) $(SUBSTITUTE_UPTIME) $(srcdir)/e2scrub.in $@
 	$(Q) chmod a+x $@
 
+e2scrub_all: e2scrub_all.in
+	$(E) "	SUBST $@"
+	$(Q) $(SUBSTITUTE_UPTIME) $(srcdir)/e2scrub_all.in $@
+	$(Q) chmod a+x $@
+
 %.8: %.8.in $(DEP_SUBSTITUTE)
 	$(E) "	SUBST $@"
 	$(Q) $(SUBSTITUTE_UPTIME) $< $@
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.
+.SH SYNOPSYS
+.B
+e2scrub_all
+.SH DESCRIPTION
+Searches the system for all LVM volumes containing an ext2, ext3, or
+ext4 file system, and checks them all for errors.
+If the file system has no errors, it will be fstrim'd.
+.SH AUTHOR
+Darrick J. Wong <darrick.wong@...cle.com>
+.SH COPYRIGHT
+Copyright ©2018 Darrick J. Wong.  License is GPLv2+. <http://www.gnu.org/licenses/gpl-2.0.html>
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}"
+}
+
+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")"
+
+# 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