#!/bin/sh
#
# Copyright 2022 Michael J. Karels
# Copyright 2014 John-Mark Gurney
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#
# PROVIDE: growfs
# REQUIRE: fsck
# BEFORE: root
# KEYWORD: firstboot
# Grow root partition to fill available space, optionally adding a swap
# partition at the end. This allows us to distribute an image and
# have it work on essentially any size drive.
# Note that this uses awk(1), and thus will not work if /usr is on a separate
# filesystem. We need to run early, because there might be not enough free
# space on rootfs for the boot to succeed, and on images we ship - which are
# the primary purpose of this script - there is no separate /usr anyway.
. /etc/rc.subr
name="growfs"
desc="Grow root partition to fill device"
start_cmd="growfs_start"
stop_cmd=":"
rcvar="growfs_enable"
growfs_get_diskdev()
{
local _search=${1}
sysctl -b kern.geom.conftxt |
while read x1 _type _dev line
do
if [ "${_type}" = "DISK" -a -n "$(echo ${_search} | grep ${_dev})" ]; then
echo -n ${_dev}
break
fi
done
}
# Compute upper bound on swap partition size (if added), based on physmem
# and vm.swap_maxpages / 2 (the limit that elicits a warning).
# Rule for swap size based on memory size:
# up to 4 GB twice memory size
# 4 GB - 8 GB 8 GB
# over 8 GB memory size
growfs_swap_max()
{
memsize=$(sysctl -n hw.physmem)
memsizeMB=$(($memsize / (1024 * 1024)))
if [ $memsizeMB -lt 4096 ]
then
swapmax=$(($memsize * 2))
elif [ $memsizeMB -lt 8192 ]
then
swapmax=$((8192 * 1024 * 1024))
else
swapmax=$memsize
fi
pagesize=$(sysctl -n hw.pagesize)
vm_swap_max=$(($(sysctl -n vm.swap_maxpages) / 2 * $pagesize))
if [ $swapmax -gt $vm_swap_max ]
then
swapmax=$vm_swap_max
fi
echo -n "$swapmax"
}
# Find newly-added swap partition on parent device ($1).
growfs_last_swap()
{
swapdev=$(gpart list $1 | awk '
$2 == "Name:" { dev = $3 }
$1 == "type:" && $2 == "freebsd-swap" { swapdev = dev }
END { print swapdev }
')
echo -n $swapdev
}
growfs_start()
{
verbose=0
echo "Growing root partition to fill device"
FSTYPE=$(mount -p | awk '{ if ( $2 == "/") { print $3 }}')
FSDEV=$(mount -p | awk '{ if ( $2 == "/") { print $1 }}')
case "$FSTYPE" in
ufs)
rootdev=${FSDEV#/dev/}
;;
zfs)
pool=${FSDEV%%/*}
rootdev=$(zpool list -v $pool | awk 'END { print $1 }')
;;
*)
echo "Don't know how to grow root filesystem type: $FSTYPE"
return
esac
if [ x"$rootdev" = x"${rootdev%/*}" ]; then
# raw device
rawdev="$rootdev"
else
rawdev=$(glabel status | awk -v rootdev=$rootdev 'index(rootdev, $1) { print $3; }')
if [ x"$rawdev" = x"" ]; then
echo "Can't figure out device for: $rootdev"
return
fi
fi
if [ x"diskid" = x"${rootdev%/*}" ]; then
search=$rootdev
else
search=$rawdev
fi
diskdev=$(growfs_get_diskdev ${search})
if [ -z "${diskdev}" ]; then
diskdev=${rootdev}
fi
# Check kenv for growfs_swap_size; if not present,
# check $growfs_swap_size from /etc/rc.conf.
# A value of 0 suppresses swap addition,
# "" (or unset) specifies the default;
# other values indicate the size in bytes.
# If default, check whether swap is already in fstab;
# if so, don't add another.
addswap=1
swapsize="$(kenv -q growfs_swap_size 2>/dev/null)"
case "$swapsize" in
"0") addswap=0
;;
"") case "$growfs_swap_size" in
"0") addswap=0
;;
"")
if ! awk '
/^#/ { next }
$3 == "swap" { exit 1 }
' < /etc/fstab
then
addswap=0
fi
;;
*) swapsize="$growfs_swap_size"
;;
esac
;;
*) ;;
esac
swaplim=$(growfs_swap_max)
[ $verbose -eq 1 ] && {
echo "diskdev is $diskdev"
echo "search is $search"
echo "swapsize is $swapsize"
echo "swaplim is $swaplim"
}
sysctl -b kern.geom.conftxt | awk '
{
verbose = 0
lvl=$1
device[lvl] = $3
type[lvl] = $2
idx[lvl] = $7
offset[lvl] = $9
parttype[lvl] = $13
size[lvl] = $4
if (verbose) print lvl, type[lvl], $3
if (type[lvl] == "DISK") {
disksize = size[lvl]
if (verbose)
print "disksize ", disksize
# Do not add swap on disks under 15 GB (decimal) by default.
if (addswap == 1 && (size[lvl] > 15000000000 || swapsize > 0))
doing_swap = 1
else
doing_swap = 0
} else if (type[lvl] == "PART" && $11 == "freebsd-swap" && \
int(swapsize) == 0) {
# This finds swap only if it precedes root, e.g. preceding disk.
addswap = 0
doing_swap = 0
print "swap device exists, not adding swap"
}
if (dev == $3) {
for (i = 1; i <= lvl; i++) {
# resize
if (type[i] == "PART") {
pdev = device[i - 1]
if (verbose)
print i, pdev, addswap, disksize, \
doing_swap
swapcmd = ""
# Allow swap if current root is < 40% of disk.
if (parttype[i] != "MBR" && doing_swap == 1 && \
(size[i] / disksize < 0.4 || \
swapsize > 0)) {
print "Adding swap partition"
if (int(swapsize) == 0) {
swapsize = int(disksize / 10)
if (swapsize > swaplim)
swapsize = swaplim
}
sector = $5
swapsize /= sector
if (verbose)
print "swapsize sectors",
swapsize
align = 4 * 1024 * 1024 / sector
# Estimate offset for swap; let
# gpart compute actual start and size.
# Assume expansion all goes into this
# partition for MBR case.
if (parttype[i - 1] == "MBR") {
if (verbose)
print "sz ", size[i - 1], \
" off ", offset[i - 1]
expand = size[0] - \
(size[i - 1] + offset[i - 1])
} else {
if (verbose)
print "sz ", size[i], \
" off ", offset[i]
expand = size[0] - \
(size[i] + offset[i])
}
if (verbose)
print "expand ", expand, \
" sz ", size[i]
swapbase = (expand + size[i]) / sector
swapbase -= swapsize + align
swapcmd = "gpart add -t freebsd-swap -a " align " -b " int(swapbase) " " pdev " && kenv growfs_swap_pdev=" pdev " >/dev/null; "
if (verbose)
swapcmd = "set -x; gpart show; " swapcmd
}
cmd[i] = swapcmd "gpart resize -i " idx[i] " " pdev
if (parttype[i] == "GPT")
cmd[i] = "gpart recover " pdev " ; " cmd[i]
} else if (type[i] == "LABEL") {
continue
} else {
print "unhandled type: " type[i]
exit 1
}
}
for (i = 1; i <= lvl; i++) {
if (cmd[i])
system(cmd[i])
}
exit 0
}
}' dev="$search" addswap="$addswap" swapsize="$swapsize" swaplim="$swaplim"
gpart commit "$diskdev" 2> /dev/null
case "$FSTYPE" in
ufs)
growfs -y /dev/"$rootdev"
;;
zfs)
zpool online -e $pool $rootdev
;;
esac
# Get parent device of swap partition if one was added;
# if so, find swap device and label it.
pdev=$(kenv -q growfs_swap_pdev)
if [ -n "$pdev" ]
then
dev=$(growfs_last_swap "$pdev")
if [ -z "$dev" ]
then
echo "Swap partition not found on $pdev"
exit 0
fi
glabel label -v growfs_swap $dev
fi
}
load_rc_config $name
run_rc_command "$1"
plain