Message-ID: <151992861611.32479.17493208727009697889.stgit@magnolia>
Date:   Thu, 01 Mar 2018 10:23:36 -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 1/7] e2scrub: create online fsck tool of sorts

From: Darrick J. Wong <darrick.wong@...cle.com>

Implement online fsck for ext* filesystems which live on LVM-managed
logical volumes.  The basic strategy mirrors that of e2croncheck --
create a snapshot, fsck the snapshot, report whatever errors appear,
remove snapshot.  Unlike e2croncheck, this utility accepts any LVM
device path, knows about snapshots running out of space, and can call
fstrim having validated that the fs metadata is ok.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 MCONFIG.in             |    3 +
 Makefile.in            |    3 +
 configure              |  137 +++++++++++++++++++++++++++++++++++-
 configure.ac           |   45 ++++++++++++
 debian/control         |    2 -
 debian/e2fsprogs.files |    1 
 scrub/Makefile.in      |   97 ++++++++++++++++++++++++++
 scrub/e2scrub.8.in     |   31 ++++++++
 scrub/e2scrub.conf.in  |   10 +++
 scrub/e2scrub.in       |  182 ++++++++++++++++++++++++++++++++++++++++++++++++
 scrub/e2scrub.rules.in |    2 +
 util/subst.conf.in     |    2 +
 12 files changed, 508 insertions(+), 7 deletions(-)
 create mode 100644 scrub/Makefile.in
 create mode 100644 scrub/e2scrub.8.in
 create mode 100644 scrub/e2scrub.conf.in
 create mode 100644 scrub/e2scrub.in
 create mode 100644 scrub/e2scrub.rules.in


diff --git a/MCONFIG.in b/MCONFIG.in
index 22b74eb..adeb5bd 100644
--- a/MCONFIG.in
+++ b/MCONFIG.in
@@ -33,6 +33,9 @@ infodir = @infodir@
 datadir = @datadir@
 pkgconfigdir = $(libdir)/pkgconfig
 
+HAVE_UDEV = @have_udev@
+UDEV_RULES_DIR = @pkg_udev_rules_dir@
+
 @SET_MAKE@
 
 @ifGNUmake@ V =
diff --git a/Makefile.in b/Makefile.in
index 37b6069..ddd94ec 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -13,10 +13,11 @@ INSTALL = @INSTALL@
 @DEBUGFS_CMT@...UGFS_DIR= debugfs
 @UUID_CMT@...D_LIB_SUBDIR= lib/uuid
 @BLKID_CMT@...ID_LIB_SUBDIR= lib/blkid
+@...CRUB_CMT@...CRUB_DIR= scrub
 SUPPORT_LIB_SUBDIR= lib/support
 
 LIB_SUBDIRS=lib/et lib/ss lib/e2p $(UUID_LIB_SUBDIR) $(BLKID_LIB_SUBDIR) $(SUPPORT_LIB_SUBDIR) lib/ext2fs intl
-PROG_SUBDIRS=e2fsck $(DEBUGFS_DIR) misc $(RESIZE_DIR) tests/progs po
+PROG_SUBDIRS=e2fsck $(DEBUGFS_DIR) misc $(RESIZE_DIR) tests/progs po $(E2SCRUB_DIR)
 SUBDIRS=util $(LIB_SUBDIRS) $(PROG_SUBDIRS) tests
 
 SUBS= util/subst.conf lib/config.h $(top_builddir)/lib/dirpaths.h \
diff --git a/configure b/configure
index b2701d2..4a11fc3 100755
--- a/configure
+++ b/configure
@@ -625,6 +625,10 @@ gl_use_threads_default=
 ac_func_list=
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
+pkg_udev_rules_dir
+have_udev
+udev_LIBS
+udev_CFLAGS
 LDFLAGS_SHLIB
 CFLAGS_STLIB
 CFLAGS_SHLIB
@@ -639,6 +643,7 @@ root_libdir
 root_sbindir
 root_bindir
 root_prefix
+E2SCRUB_CMT
 UNIX_CMT
 CYGWIN_CMT
 LINUX_CMT
@@ -892,6 +897,7 @@ with_included_gettext
 with_libintl_prefix
 enable_fuse2fs
 with_multiarch
+with_udev_rules_dir
 '
       ac_precious_vars='build_alias
 host_alias
@@ -904,7 +910,9 @@ CPPFLAGS
 CPP
 PKG_CONFIG
 PKG_CONFIG_PATH
-PKG_CONFIG_LIBDIR'
+PKG_CONFIG_LIBDIR
+udev_CFLAGS
+udev_LIBS'
 
 
 # Initialize some variables set by options.
@@ -1580,6 +1588,8 @@ Optional Packages:
   --with-libintl-prefix[=DIR]  search for libintl in DIR/include and DIR/lib
   --without-libintl-prefix     don't search for libintl in includedir and libdir
   --with-multiarch=ARCH specify the multiarch triplet
+  --with-udev-rules-dir[=DIR]
+                          Install udev rules into DIR.
 
 Some influential environment variables:
   CC          C compiler command
@@ -1595,6 +1605,8 @@ Some influential environment variables:
               directories to add to pkg-config's search path
   PKG_CONFIG_LIBDIR
               path overriding pkg-config's built-in search path
+  udev_CFLAGS C compiler flags for udev, overriding pkg-config
+  udev_LIBS   linker flags for udev, overriding pkg-config
 
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
@@ -7236,8 +7248,6 @@ main ()
     if (*(data + i) != *(data3 + i))
       return 14;
   close (fd);
-  free (data);
-  free (data3);
   return 0;
 }
 _ACEOF
@@ -13713,6 +13723,8 @@ esac
 
 
 
+E2SCRUB_CMT="$LINUX_CMT"
+
 case "$host_os" in
 linux* | gnu* | k*bsd*-gnu)
 	if test "$prefix" = NONE -a "$root_prefix" = NONE ; then
@@ -13878,6 +13890,123 @@ LDFLAGS_SHLIB=${LDFLAGS_SHLIB:-$LDFLAGS}
 
 
 
+
+
+# Check whether --with-udev_rules_dir was given.
+if test "${with_udev_rules_dir+set}" = set; then :
+  withval=$with_udev_rules_dir;
+else
+  with_udev_rules_dir=yes
+fi
+
+if test "x${with_udev_rules_dir}" != "xno"; then :
+
+	if test "x${with_udev_rules_dir}" = "xyes"; then :
+
+
+pkg_failed=no
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for udev" >&5
+$as_echo_n "checking for udev... " >&6; }
+
+if test -n "$udev_CFLAGS"; then
+    pkg_cv_udev_CFLAGS="$udev_CFLAGS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"udev\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "udev") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  pkg_cv_udev_CFLAGS=`$PKG_CONFIG --cflags "udev" 2>/dev/null`
+		      test "x$?" != "x0" && pkg_failed=yes
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+if test -n "$udev_LIBS"; then
+    pkg_cv_udev_LIBS="$udev_LIBS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"udev\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "udev") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  pkg_cv_udev_LIBS=`$PKG_CONFIG --libs "udev" 2>/dev/null`
+		      test "x$?" != "x0" && pkg_failed=yes
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+
+
+
+if test $pkg_failed = yes; then
+   	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
+        _pkg_short_errors_supported=yes
+else
+        _pkg_short_errors_supported=no
+fi
+        if test $_pkg_short_errors_supported = yes; then
+	        udev_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "udev" 2>&1`
+        else
+	        udev_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "udev" 2>&1`
+        fi
+	# Put the nasty error message in config.log where it belongs
+	echo "$udev_PKG_ERRORS" >&5
+
+
+			with_udev_rules_dir=""
+
+elif test $pkg_failed = untried; then
+     	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+			with_udev_rules_dir=""
+
+else
+	udev_CFLAGS=$pkg_cv_udev_CFLAGS
+	udev_LIBS=$pkg_cv_udev_LIBS
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+
+			with_udev_rules_dir="$($PKG_CONFIG --variable=udevdir udev)/rules.d"
+
+fi
+
+fi
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for udev rules dir" >&5
+$as_echo_n "checking for udev rules dir... " >&6; }
+	pkg_udev_rules_dir="${with_udev_rules_dir}"
+	if test -n "${pkg_udev_rules_dir}"; then :
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ${pkg_udev_rules_dir}" >&5
+$as_echo "${pkg_udev_rules_dir}" >&6; }
+		have_udev="yes"
+
+else
+
+		{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+		have_udev="no"
+
+fi
+
+else
+
+	have_udev="disabled"
+
+fi
+
+
+
 test -d lib || mkdir lib
 test -d include || mkdir include
 test -d include/linux || mkdir include/linux
@@ -13899,7 +14028,7 @@ for i in MCONFIG Makefile e2fsprogs.spec \
 	misc/Makefile ext2ed/Makefile e2fsck/Makefile \
 	debugfs/Makefile tests/Makefile tests/progs/Makefile \
 	resize/Makefile doc/Makefile intl/Makefile \
-	intl/libgnuintl.h po/Makefile.in ; do
+	intl/libgnuintl.h po/Makefile.in scrub/Makefile; do
 	if test -d `dirname ${srcdir}/$i` ; then
 		outlist="$outlist $i"
 	fi
diff --git a/configure.ac b/configure.ac
index 7392959..6ffff5d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1312,6 +1312,11 @@ AC_SUBST(LINUX_CMT)
 AC_SUBST(CYGWIN_CMT)
 AC_SUBST(UNIX_CMT)
 dnl
+dnl e2scrub only builds on linux
+dnl
+E2SCRUB_CMT="$LINUX_CMT"
+AC_SUBST(E2SCRUB_CMT)
+dnl
 dnl Linux and Hurd places root files in the / by default
 dnl
 case "$host_os" in
@@ -1469,6 +1474,44 @@ LDFLAGS_SHLIB=${LDFLAGS_SHLIB:-$LDFLAGS}
 AC_SUBST(CFLAGS_SHLIB)
 AC_SUBST(CFLAGS_STLIB)
 AC_SUBST(LDFLAGS_SHLIB)
+
+dnl
+dnl Where do udev rules go?
+dnl
+AC_ARG_WITH([udev_rules_dir],
+  [AS_HELP_STRING([--with-udev-rules-dir@<:@=DIR@:>@],
+	[Install udev rules into DIR.])],
+  [],
+  [with_udev_rules_dir=yes])
+AS_IF([test "x${with_udev_rules_dir}" != "xno"],
+  [
+	AS_IF([test "x${with_udev_rules_dir}" = "xyes"],
+	  [
+		PKG_CHECK_MODULES([udev], [udev],
+		  [
+			with_udev_rules_dir="$($PKG_CONFIG --variable=udevdir udev)/rules.d"
+		  ], [
+			with_udev_rules_dir=""
+		  ])
+	  ])
+	AC_MSG_CHECKING([for udev rules dir])
+	pkg_udev_rules_dir="${with_udev_rules_dir}"
+	AS_IF([test -n "${pkg_udev_rules_dir}"],
+	  [
+		AC_MSG_RESULT(${pkg_udev_rules_dir})
+		have_udev="yes"
+	  ],
+	  [
+		AC_MSG_RESULT(no)
+		have_udev="no"
+	  ])
+  ],
+  [
+	have_udev="disabled"
+  ])
+AC_SUBST(have_udev)
+AC_SUBST(pkg_udev_rules_dir)
+
 dnl
 dnl Make our output files, being sure that we create the some miscellaneous 
 dnl directories
@@ -1494,7 +1537,7 @@ for i in MCONFIG Makefile e2fsprogs.spec \
 	misc/Makefile ext2ed/Makefile e2fsck/Makefile \
 	debugfs/Makefile tests/Makefile tests/progs/Makefile \
 	resize/Makefile doc/Makefile intl/Makefile \
-	intl/libgnuintl.h po/Makefile.in ; do
+	intl/libgnuintl.h po/Makefile.in scrub/Makefile; do
 	if test -d `dirname ${srcdir}/$i` ; then
 		outlist="$outlist $i"
 	fi
diff --git a/debian/control b/debian/control
index ee0f66b..3515d3d 100644
--- a/debian/control
+++ b/debian/control
@@ -189,7 +189,7 @@ Essential: yes
 Pre-Depends: ${shlibs:Depends}, ${misc:Depends}, libblkid1, libuuid1
 Multi-Arch: foreign
 Suggests: gpart, parted, fuse2fs, e2fsck-static
-Recommends: e2fsprogs-l10n
+Recommends: e2fsprogs-l10n, lvm2, util-linux, coreutils
 Architecture: any
 Description: ext2/ext3/ext4 file system utilities
  The ext2, ext3 and ext4 file systems are successors of the original ext
diff --git a/debian/e2fsprogs.files b/debian/e2fsprogs.files
index 0a22f31..78720fe 100644
--- a/debian/e2fsprogs.files
+++ b/debian/e2fsprogs.files
@@ -3,3 +3,4 @@ usr/bin
 usr/sbin
 usr/share/man
 etc
+lib/udev/rules.d
diff --git a/scrub/Makefile.in b/scrub/Makefile.in
new file mode 100644
index 0000000..a8bb06b
--- /dev/null
+++ b/scrub/Makefile.in
@@ -0,0 +1,97 @@
+#
+# Makefile for e2scrub
+#
+
+srcdir = @srcdir@
+top_srcdir = @top_srcdir@
+VPATH = @srcdir@
+top_builddir = ..
+my_dir = scrub
+INSTALL = @INSTALL@
+
+@...NFIG@
+
+PROGS=		e2scrub
+MANPAGES=	e2scrub.8
+CONFFILES=	e2scrub.conf
+
+ifeq ($(HAVE_UDEV),yes)
+UDEV_RULES	= e2scrub.rules
+INSTALLDIRS_TGT	+= installdirs-udev
+INSTALL_TGT	+= install-udev
+UNINSTALL_TGT	+= uninstall-udev
+endif
+
+all:: $(PROGS) $(MANPAGES) $(CONFFILES) $(UDEV_RULES)
+
+e2scrub: $(DEP_SUBSTITUTE) e2scrub.in
+	$(E) "	SUBST $@"
+	$(Q) $(SUBSTITUTE_UPTIME) $(srcdir)/e2scrub.in $@
+	$(Q) chmod a+x $@
+
+%.8: %.8.in $(DEP_SUBSTITUTE)
+	$(E) "	SUBST $@"
+	$(Q) $(SUBSTITUTE_UPTIME) $< $@
+
+%.conf: %.conf.in $(DEP_SUBSTITUTE)
+	$(E) "	SUBST $@"
+	$(Q) $(SUBSTITUTE_UPTIME) $< $@
+
+%.rules: %.rules.in $(DEP_SUBSTITUTE)
+	$(E) "	SUBST $@"
+	$(Q) $(SUBSTITUTE_UPTIME) $< $@
+
+installdirs-udev:
+	$(E) "	MKINSTALLDIRS $(UDEV_RULES_DIR)"
+	$(Q) $(MKINSTALLDIRS) $(DESTDIR)$(UDEV_RULES_DIR)
+
+installdirs: $(INSTALLDIRS_TGT)
+	$(E) "	MKINSTALLDIRS $(root_sbindir) $(man8dir) $(root_sysconfdir)"
+	$(Q) $(MKINSTALLDIRS) $(DESTDIR)$(root_sbindir) \
+		$(DESTDIR)$(man8dir) $(DESTDIR)$(root_sysconfdir)
+
+install-udev:
+	$(Q) for i in $(UDEV_RULES); do \
+		$(ES) "	INSTALL $(UDEV_RULES_DIR)/$$i"; \
+		$(INSTALL_PROGRAM) $$i $(DESTDIR)$(UDEV_RULES_DIR)/96-$$i; \
+	done
+
+install: $(PROGS) $(MANPAGES) $(FMANPAGES) installdirs $(INSTALL_TGT)
+	$(Q) for i in $(PROGS); do \
+		$(ES) "	INSTALL $(root_sbindir)/$$i"; \
+		$(INSTALL_PROGRAM) $$i $(DESTDIR)$(root_sbindir)/$$i; \
+	done
+	$(Q) for i in $(MANPAGES); do \
+		for j in $(COMPRESS_EXT); do \
+			$(RM) -f $(DESTDIR)$(man8dir)/$$i.$$j; \
+		done; \
+		$(ES) "	INSTALL_DATA $(man8dir)/$$i"; \
+		$(INSTALL_DATA) $$i $(DESTDIR)$(man8dir)/$$i; \
+	done
+	$(Q) for i in $(CONFFILES); do \
+		$(ES) "	INSTALL_DATA $(root_sysconfdir)/$$i"; \
+		$(INSTALL_DATA) $$i $(DESTDIR)$(root_sysconfdir)/$$i; \
+	done
+
+uninstall-udev:
+	for i in $(UDEV_RULES); do \
+		$(RM) -f $(DESTDIR)$(UDEV_RULES_DIR)/96-$$i; \
+	done
+
+uninstall: $(UNINSTALL_TGT)
+	for i in $(PROGS); do \
+		$(RM) -f $(DESTDIR)$(root_sbindir)/$$i; \
+	done
+	for i in $(MANPAGES); do \
+		$(RM) -f $(DESTDIR)$(man8dir)/$$i; \
+	done
+	for i in $(CONFFILES); do \
+		$(RM) -f $(DESTDIR)$(root_sysconfdir)/$$i; \
+	done
+
+clean::
+	$(RM) -f $(PROGS)
+
+mostlyclean: clean
+distclean: clean
+	$(RM) -f .depend Makefile $(srcdir)/TAGS $(srcdir)/Makefile.in.old
diff --git a/scrub/e2scrub.8.in b/scrub/e2scrub.8.in
new file mode 100644
index 0000000..e9b3e4f
--- /dev/null
+++ b/scrub/e2scrub.8.in
@@ -0,0 +1,31 @@
+.TH E2SCRUB 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
+.SH NAME
+e2scrub - check a mounted ext2/ext3/ext4 file system on an LVM volume for errors.
+.SH SYNOPSYS
+.B
+e2scrub [OPTION] [LVM DEVICE PATH]
+.SH DESCRIPTION
+Given a live file system on a LVM volume, this program snapshots the
+logical volume and runs a file system check to look for serious errors.
+If no errors are found, fstrim can be called on the mounted file system.
+However, if errors are found, the file system should be unmounted and
+fixed.
+.SH OPTIONS
+.TP
+\fB-t\fR
+Run
+.B
+fstrim(1)
+on the mounted filesystem if no errors are found.
+.SH EXIT CODE
+The exit codes are the same as in
+.BR e2fsck (8)
+.SH BUGS
+This utility is capable of checking any ext* filesystem on an LVM volume,
+regardless of whether it is mounted.
+.SH SEE ALSO
+.BR e2fsck (8)
+.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.conf.in b/scrub/e2scrub.conf.in
new file mode 100644
index 0000000..fec828a
--- /dev/null
+++ b/scrub/e2scrub.conf.in
@@ -0,0 +1,10 @@
+# e2scrub configuration file
+
+# Snapshots will be created to run fsck; the snapshot will be of this size.
+# snap_size_mb=256
+
+# Set this to 1 to enable fstrim for everyone
+# fstrim=0
+
+# Arguments passed into e2fsck
+# e2fsck_opts="-vtt"
diff --git a/scrub/e2scrub.in b/scrub/e2scrub.in
new file mode 100644
index 0000000..32d11c8
--- /dev/null
+++ b/scrub/e2scrub.in
@@ -0,0 +1,182 @@
+#!/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.
+
+# Automatically check a LVM-managed filesystem online.
+# We use lvm snapshots to do this, which means that we can only
+# check filesystems in VGs that have at least 256mb (or so) of
+# free space.
+
+snap_size_mb=256
+fstrim=0
+e2fsck_opts=""
+conffile="@root_sysconfdir@...scrub.conf"
+
+test -f "${conffile}" && . "${conffile}"
+
+print_help() {
+	echo "Usage: $0 [-t] device"
+	echo
+	echo "device must be a LVM-managed block device"
+	echo "-t: Run fstrim if successful."
+}
+
+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")"
+LVCREATE_PROG="$(prog_path "@root_sbindir@...create" "lvcreate")"
+LVREMOVE_PROG="$(prog_path "@root_sbindir@...remove" "lvremove")"
+FSTRIM_PROG="$(prog_path "@root_sbindir@...trim")"
+UDEVADM_PROG="$(prog_path "@root_sbindir@...evadm")"
+SLEEP_PROG="$(prog_path "@root_bindir@...eep")"
+
+while getopts "t" opt; do
+	case "${opt}" in
+	"t") fstrim=1;;
+	*) print_help; exitcode 2;;
+	esac
+done
+shift "$((OPTIND - 1))"
+
+dev="$1"
+if [ -z "${dev}" ]; then
+	print_help
+	exitcode 1
+elif [ ! -b "${dev}" ]; then
+	echo "${dev}: Not a block device?"
+	print_help
+	exitcode 16
+fi
+
+# Make sure this is an LVM device we can snapshot
+vg="$("${LVS_PROG}" --noheadings -o vg_name "${dev}" 2> /dev/null | sed -e 's/^  //g')"
+lv="$("${LVS_PROG}" --noheadings -o lv_name "${dev}" 2> /dev/null | sed -e 's/^  //g')"
+if [ -z "${vg}" ] || [ -z "${lv}" ]; then
+	echo "${dev}: Not a LVM device."
+	exitcode 16
+fi
+start_time="$(date +'%Y%m%d%H%M%S')"
+snap="${lv}.e2scrub"
+snap_dev="/dev/${vg}/${snap}"
+fstype="$("${BLKID_PROG}" -p -s TYPE "${dev}" | sed -e 's/^.*TYPE="\(.*\)".*$/\1/g')"
+
+case "${fstype}" in
+"ext2"|"ext3"|"ext4")
+	;;
+*)
+	echo "${dev}: Filesystem of type ${fstype} not supported."
+	exitcode 16
+	;;
+esac
+
+teardown() {
+	# Remove and wait for removal to succeed.
+	"${LVREMOVE_PROG}" -f "${vg}/${snap}" 3>&-
+	while [ -b "${snap_dev}" ] && [ "$?" -eq "5" ]; do
+		/bin/sleep 0.5
+		"${LVREMOVE_PROG}" -f "${vg}/${snap}" 3>&-
+	done
+}
+
+check() {
+	# First we preen the filesystem to recover the journal, then
+	# we see if e2fsck tries any non-optimization repairs.  If
+	# either of these two returns a non-zero status (errors fixed
+	# or remaining) then this fs is bad.
+	E2FSCK_FIXES_ONLY=1
+	export E2FSCK_FIXES_ONLY
+	${DBG} "@root_sbindir@...fsck" -p ${e2fsck_opts} "${snap_dev}" || return 1
+	${DBG} "@root_sbindir@...fsck" -fy ${e2fsck_opts} "${snap_dev}" || return 1
+	return 0
+}
+
+mark_clean() {
+	${DBG} "@root_sbindir@...ne2fs" -C 0 -T "${start_time}" "${dev}"
+}
+
+mark_corrupt() {
+	${DBG} "@root_sbindir@...ne2fs" -C 16000 -T "19000101" "${dev}"
+}
+
+setup() {
+	# Create the snapshot, wait for device to appear
+	teardown > /dev/null 2> /dev/null
+	"${LVCREATE_PROG}" -s -L "${snap_size_mb}m" -n "${snap}" "${vg}/${lv}" 3>&-
+	test $? -ne 0 && return 1
+	test -x "${UDEVADM_PROG}" && "${UDEVADM_PROG}" settle
+	return 0
+}
+
+trap "teardown" EXIT INT QUIT TERM
+if ! setup; then
+	echo "Snapshot of ${dev} FAILED, will not check!"
+	exitcode 1
+fi
+
+# Check and react
+if check; then
+	echo "Scrub of ${dev} succeeded."
+	mark_clean
+
+	if [ "${fstrim}" -eq 1 ] && [ -x "${FSTRIM_PROG}" ]; then
+		dir="$(lsblk -o MOUNTPOINT -n "${dev}")"
+		if [ -d "${dir}" ]; then
+			# NB: fstrim fails with snapshot present
+			trap '' EXIT
+			teardown
+			"${FSTRIM_PROG}" -v "${dir}"
+		fi
+	fi
+
+	ret=0
+else
+	# fsck failed.  Check if the snapshot is invalid; if so, make a
+	# note of that at the end of the log.  This isn't necessarily a
+	# failure because the mounted fs could have overflowed the
+	# snapshot with regular disk writes /or/ our repair process
+	# could have done it by repairing too much.
+	#
+	# If it's really corrupt we ought to fsck at next boot.
+	is_invalid="$("${LVS_PROG}" -o lv_snapshot_invalid --noheadings "${snap_dev}")"
+	if [ -n "${is_invalid}" ]; then
+		echo "Scrub of ${dev} FAILED due to invalid snapshot."
+		ret=8
+	else
+		echo "Scrub of ${dev} FAILED!  Reboot soon to fsck."
+		mark_corrupt
+		ret=6
+	fi
+fi
+
+exitcode "${ret}"
diff --git a/scrub/e2scrub.rules.in b/scrub/e2scrub.rules.in
new file mode 100644
index 0000000..5e1b35b
--- /dev/null
+++ b/scrub/e2scrub.rules.in
@@ -0,0 +1,2 @@
+# Try to hide our fsck snapshots from udev's /dev/disk linking...
+ACTION=="add|change", ENV{DM_LV_NAME}=="*.e2scrub", OPTIONS="link_priority=-100"
diff --git a/util/subst.conf.in b/util/subst.conf.in
index fbc044d..effac78 100644
--- a/util/subst.conf.in
+++ b/util/subst.conf.in
@@ -18,3 +18,5 @@ $prefix			@prefix@
 JDEV			
 # Enable the documentation for the tdb profile in e2fsck.conf's man page
 TDB_MAN_COMMENT		@TDB_MAN_COMMENT@
+root_sbindir		@root_sbindir@
+root_bindir		@root_bindir@

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