[2/4] e2scrub: create online fsck tool of sorts

From: Darrick J. Wong <darrick.wong@oracle.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@oracle.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
---
 MCONFIG.in             |    3 +
 Makefile.in            |    3 +
 configure              |  149 ++++++++++++++++++++++++++++++++++++++++--
 configure.ac           |   56 ++++++++++++++--
 debian/control         |    2 -
 debian/e2fsprogs.files |    1 
 scrub/Makefile.in      |   97 +++++++++++++++++++++++++++
 scrub/e2scrub.8.in     |   57 ++++++++++++++++
 scrub/e2scrub.conf.in  |   10 +++
 scrub/e2scrub.in       |  170 ++++++++++++++++++++++++++++++++++++++++++++++++
 scrub/e2scrub.rules.in |    2 +
 util/subst.conf.in     |    3 +
 12 files changed, 536 insertions(+), 17 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

On Mon, Mar 12, 2018 at 09:14:47AM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.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.

Looks good. Thanks!

Reviewed-by: Lukas Czerner <lczerner@redhat.com>

> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> Reviewed-by: Andreas Dilger <adilger@dilger.ca>
> ---
>  MCONFIG.in             |    3 +
>  Makefile.in            |    3 +
>  configure              |  149 ++++++++++++++++++++++++++++++++++++++++--
>  configure.ac           |   56 ++++++++++++++--
>  debian/control         |    2 -
>  debian/e2fsprogs.files |    1 
>  scrub/Makefile.in      |   97 +++++++++++++++++++++++++++
>  scrub/e2scrub.8.in     |   57 ++++++++++++++++
>  scrub/e2scrub.conf.in  |   10 +++
>  scrub/e2scrub.in       |  170 ++++++++++++++++++++++++++++++++++++++++++++++++
>  scrub/e2scrub.rules.in |    2 +
>  util/subst.conf.in     |    3 +
>  12 files changed, 536 insertions(+), 17 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@DEBUGFS_DIR= debugfs
>  @UUID_CMT@UUID_LIB_SUBDIR= lib/uuid
>  @BLKID_CMT@BLKID_LIB_SUBDIR= lib/blkid
> +@E2SCRUB_CMT@E2SCRUB_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..986e057 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
> @@ -795,6 +800,7 @@ build_os
>  build_vendor
>  build_cpu
>  build
> +E2FSPROGS_DATE
>  E2FSPROGS_PKGVER
>  E2FSPROGS_VERSION
>  E2FSPROGS_DAY
> @@ -892,6 +898,7 @@ with_included_gettext
>  with_libintl_prefix
>  enable_fuse2fs
>  with_multiarch
> +with_udev_rules_dir
>  '
>        ac_precious_vars='build_alias
>  host_alias
> @@ -904,7 +911,9 @@ 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 +1589,8 @@ 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 +1606,8 @@ 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.
> @@ -2758,11 +2771,11 @@ MCONFIG=./MCONFIG
>  BINARY_TYPE=bin
>  E2FSPROGS_VERSION=`grep E2FSPROGS_VERSION ${srcdir}/version.h  \
>  	| awk '{print $3}' | tr \" " " | awk '{print $1}'`
> -DATE=`grep E2FSPROGS_DATE ${srcdir}/version.h | awk '{print $3}' \
> -	| tr \" " "`
> -E2FSPROGS_DAY=$(echo $DATE | awk -F- '{print $1}' | sed -e '/^[1-9]$/s/^/0/')
> -MONTH=`echo $DATE | awk -F- '{print $2}'`
> -YEAR=`echo $DATE | awk -F- '{print $3}'`
> +E2FSPROGS_DATE=`grep E2FSPROGS_DATE ${srcdir}/version.h | awk '{print $3}' \
> +	| tr \" " " | awk '{print $1}'`
> +E2FSPROGS_DAY=$(echo $E2FSPROGS_DATE | awk -F- '{print $1}' | sed -e '/^[1-9]$/s/^/0/')
> +MONTH=`echo $E2FSPROGS_DATE | awk -F- '{print $2}'`
> +YEAR=`echo $E2FSPROGS_DATE | awk -F- '{print $3}'`
>  
>  if expr $YEAR ">" 1900 > /dev/null ; then
>  	E2FSPROGS_YEAR=$YEAR
> @@ -2813,6 +2826,7 @@ $as_echo "Release date is ${E2FSPROGS_MONTH}, ${E2FSPROGS_YEAR}" >&6; }
>  
>  
>  
> +
>  WITH_DIET_LIBC=
>  
>  # Check whether --with-diet-libc was given.
> @@ -7236,8 +7250,6 @@ main ()
>      if (*(data + i) != *(data3 + i))
>        return 14;
>    close (fd);
> -  free (data);
> -  free (data3);
>    return 0;
>  }
>  _ACEOF
> @@ -13713,6 +13725,8 @@ esac
>  
>  
>  
> +E2SCRUB_CMT="$LINUX_CMT"
> +
>  case "$host_os" in
>  linux* | gnu* | k*bsd*-gnu)
>  	if test "$prefix" = NONE -a "$root_prefix" = NONE ; then
> @@ -13878,6 +13892,123 @@ LDFLAGS_SHLIB=${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 +14030,7 @@ 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..6e549c5 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -11,11 +11,11 @@ dnl This is to figure out the version number and the date....
>  dnl
>  E2FSPROGS_VERSION=`grep E2FSPROGS_VERSION ${srcdir}/version.h  \
>  	| awk '{print $3}' | tr \" " " | awk '{print $1}'`
> -DATE=`grep E2FSPROGS_DATE ${srcdir}/version.h | awk '{print $3}' \
> -	| tr \" " "`
> -E2FSPROGS_DAY=$(echo $DATE | awk -F- '{print $1}' | sed -e '/^[[1-9]]$/s/^/0/')
> -MONTH=`echo $DATE | awk -F- '{print $2}'`
> -YEAR=`echo $DATE | awk -F- '{print $3}'`
> +E2FSPROGS_DATE=`grep E2FSPROGS_DATE ${srcdir}/version.h | awk '{print $3}' \
> +	| tr \" " " | awk '{print $1}'`
> +E2FSPROGS_DAY=$(echo $E2FSPROGS_DATE | awk -F- '{print $1}' | sed -e '/^[[1-9]]$/s/^/0/')
> +MONTH=`echo $E2FSPROGS_DATE | awk -F- '{print $2}'`
> +YEAR=`echo $E2FSPROGS_DATE | awk -F- '{print $3}'`
>  
>  if expr $YEAR ">" 1900 > /dev/null ; then
>  	E2FSPROGS_YEAR=$YEAR
> @@ -63,6 +63,7 @@ AC_SUBST(E2FSPROGS_MONTH)
>  AC_SUBST(E2FSPROGS_DAY)
>  AC_SUBST(E2FSPROGS_VERSION)
>  AC_SUBST(E2FSPROGS_PKGVER)
> +AC_SUBST(E2FSPROGS_DATE)
>  dnl
>  dnl Use diet libc
>  dnl 
> @@ -1312,6 +1313,11 @@ 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 +1475,44 @@ 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 +1538,7 @@ 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}, ${misc:Depends}, libblkid1, libuuid1
>  Multi-Arch: foreign
>  Suggests: gpart, parted, fuse2fs, e2fsck-static
> -Recommends: e2fsprogs-l10n
> +Recommends: e2fsprogs-l10n, lvm2, util-linux, coreutils
>  Architecture: any
>  Description: ext2/ext3/ext4 file system utilities
>   The ext2, ext3 and ext4 file systems are successors of the original ext
> diff --git a/debian/e2fsprogs.files b/debian/e2fsprogs.files
> index 0a22f31..78720fe 100644
> --- a/debian/e2fsprogs.files
> +++ b/debian/e2fsprogs.files
> @@ -3,3 +3,4 @@ usr/bin
>  usr/sbin
>  usr/share/man
>  etc
> +lib/udev/rules.d
> diff --git a/scrub/Makefile.in b/scrub/Makefile.in
> new file mode 100644
> index 0000000..a8bb06b
> --- /dev/null
> +++ b/scrub/Makefile.in
> @@ -0,0 +1,97 @@
> +#
> +# Makefile for e2scrub
> +#
> +
> +srcdir = @srcdir@
> +top_srcdir = @top_srcdir@
> +VPATH = @srcdir@
> +top_builddir = ..
> +my_dir = scrub
> +INSTALL = @INSTALL@
> +
> +@MCONFIG@
> +
> +PROGS=		e2scrub
> +MANPAGES=	e2scrub.8
> +CONFFILES=	e2scrub.conf
> +
> +ifeq ($(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..f829092
> --- /dev/null
> +++ b/scrub/e2scrub.8.in
> @@ -0,0 +1,57 @@
> +.TH E2SCRUB 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
> +.SH NAME
> +e2scrub - check an ext[234] file system on an LVM volume for errors.
> +.SH SYNOPSYS
> +.B
> +e2scrub [OPTION] [LVM DEVICE PATH]
> +.SH DESCRIPTION
> +Given an ext[2-4] file system on a LVM logical volume, this program snapshots
> +the volume and runs a file system check on the snapshot to look for corruption
> +errors.
> +
> +The LVM volume group must have at least 256MiB of unallocated space to
> +dedicate to the snapshot or the logical volume will be skipped.
> +The snapshot will be named
> +.IR lvname ".e2scrub"
> +and
> +.B udev
> +will not create symbolic links to it under
> +.IR /dev/disk .
> +Every attempt will be made to remove the snapshots prior to running
> +.BR e2scrub ,
> +but in a dire situation it may be necessary to remove the snapshot manually.
> +
> +If no errors are found,
> +.B fstrim
> +can be called on the file system if it is mounted.
> +If errors are found, the file system will be marked as having errors.
> +The filesystem should be taken offline and
> +.B e2fsck
> +run as soon as possible, because
> +.B e2scrub
> +does not fix corruptions.
> +If the filesystem is not repaired,
> +.B e2fsck
> +will be run before the next mount.
> +.SH OPTIONS
> +.TP
> +\fB-r\fR
> +Remove the e2scrub snapshot and exit without checking anything.
> +.TP
> +\fB-t\fR
> +Run
> +.B
> +fstrim(1)
> +on the mounted filesystem if no errors are found.
> +.TP
> +\fB-V\fR
> +Print version information and exit.
> +.SH EXIT CODE
> +The exit codes are the same as in
> +.BR e2fsck (8)
> +.SH SEE ALSO
> +.BR e2fsck (8)
> +.SH AUTHOR
> +Darrick J. Wong <darrick.wong@oracle.com>
> +.SH COPYRIGHT
> +Copyright ©2018 Oracle.  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..f77ec6f
> --- /dev/null
> +++ b/scrub/e2scrub.in
> @@ -0,0 +1,170 @@
> +#!/bin/bash
> +
> +#  Copyright (C) 2018 Oracle.  All Rights Reserved.
> +#
> +#  Author: Darrick J. Wong <darrick.wong@oracle.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
> +reap=0
> +e2fsck_opts=""
> +conffile="@root_sysconfdir@/e2scrub.conf"
> +
> +test -f "${conffile}" && . "${conffile}"
> +
> +print_help() {
> +	echo "Usage: $0 [OPTIONS] device"
> +	echo
> +	echo "device must be a LVM-managed block device"
> +	echo "-r: Remove e2scrub snapshot and exit, do not check anything."
> +	echo "-t: Run fstrim if successful."
> +	echo "-V: Print version information and exit."
> +}
> +
> +print_version() {
> +	echo "e2scrub @E2FSPROGS_VERSION@ (@E2FSPROGS_DATE@)"
> +}
> +
> +while getopts "rtV" opt; do
> +	case "${opt}" in
> +	"r") reap=1;;
> +	"t") fstrim=1;;
> +	"V") print_version; exit 0;;
> +	*) print_help; exit 2;;
> +	esac
> +done
> +shift "$((OPTIND - 1))"
> +
> +dev="$1"
> +if [ -z "${dev}" ]; then
> +	print_help
> +	exit 1
> +elif [ ! -b "${dev}" ]; then
> +	echo "${dev}: Not a block device?"
> +	print_help
> +	exit 16
> +fi
> +
> +# Make sure this is an LVM device we can snapshot
> +eval $(lvs --nameprefixes -o name,vgname --noheadings "${dev}")
> +if [ -z "${LVM2_VG_NAME}" ] || [ -z "${LVM2_LV_NAME}" ]; then
> +	echo "${dev}: Not a LVM device."
> +	exit 16
> +fi
> +start_time="$(date +'%Y%m%d%H%M%S')"
> +snap="${LVM2_LV_NAME}.e2scrub"
> +snap_dev="/dev/${LVM2_VG_NAME}/${snap}"
> +fstype="$(blkid -o value -p -s TYPE "${dev}")"
> +
> +case "${fstype}" in
> +ext[234])
> +	;;
> +*)
> +	echo "${dev}: Filesystem of type ${fstype} not supported."
> +	exit 16
> +	;;
> +esac
> +
> +teardown() {
> +	# Remove and wait for removal to succeed.
> +	lvremove -f "${LVM2_VG_NAME}/${snap}" 3>&-
> +	while [ -b "${snap_dev}" ] && [ "$?" -eq "5" ]; do
> +		sleep 0.5
> +		lvremove -f "${LVM2_VG_NAME}/${snap}" 3>&-
> +	done
> +}
> +
> +check() {
> +	# First we 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@/e2fsck" -E journal_only -p ${e2fsck_opts} "${snap_dev}" || return 1
> +	${DBG} "@root_sbindir@/e2fsck" -f -y ${e2fsck_opts} "${snap_dev}" || return 1
> +	return 0
> +}
> +
> +mark_clean() {
> +	${DBG} "@root_sbindir@/tune2fs" -C 0 -T "${start_time}" "${dev}"
> +}
> +
> +mark_corrupt() {
> +	${DBG} "@root_sbindir@/tune2fs" -E force_fsck "${dev}"
> +}
> +
> +setup() {
> +	# Create the snapshot, wait for device to appear
> +	teardown > /dev/null 2> /dev/null
> +	lvcreate -s -L "${snap_size_mb}m" -n "${snap}" "${LVM2_VG_NAME}/${LVM2_LV_NAME}" 3>&-
> +	test $? -ne 0 && return 1
> +	udevadm settle 2> /dev/null
> +	return 0
> +}
> +
> +trap "teardown; exit 1" EXIT INT QUIT TERM
> +if [ "${reap}" -gt 0 ]; then
> +	teardown > /dev/null 2> /dev/null
> +	exit 0
> +fi
> +if ! setup; then
> +	echo "Snapshot of ${dev} FAILED, will not check!"
> +	exit 1
> +fi
> +
> +# Check and react
> +if check; then
> +	echo "Scrub of ${dev} succeeded."
> +	mark_clean
> +
> +	if [ "${fstrim}" -eq 1 ] && type fstrim > /dev/null 2>&1; then
> +		dir="$(lsblk -o MOUNTPOINT -n "${dev}")"
> +		if [ -d "${dir}" ]; then
> +			# NB: fstrim fails with snapshot present
> +			trap '' EXIT
> +			teardown
> +			echo "${dir}: Trimming."
> +			fstrim -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 -o lv_snapshot_invalid --noheadings "${snap_dev}" | awk '{print $1}')"
> +	if [ -n "${is_invalid}" ]; then
> +		echo "Scrub of ${dev} FAILED due to invalid snapshot."
> +		ret=8
> +	else
> +		echo "Scrub of ${dev} FAILED!  Reboot soon to fsck."
> +		mark_corrupt
> +		ret=6
> +	fi
> +fi
> +
> +exit "${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..6bf658d 100644
> --- a/util/subst.conf.in
> +++ b/util/subst.conf.in
> @@ -2,6 +2,7 @@ AWK			@AWK@
>  SED			@SED@
>  E2FSPROGS_MONTH		@E2FSPROGS_MONTH@
>  E2FSPROGS_YEAR		@E2FSPROGS_YEAR@
> +E2FSPROGS_DATE		@E2FSPROGS_DATE@
>  E2FSPROGS_VERSION	@E2FSPROGS_VERSION@
>  SIZEOF_LONG_LONG	@SIZEOF_LONG_LONG@
>  SIZEOF_LONG		@SIZEOF_LONG@
> @@ -18,3 +19,5 @@ $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@
>