This rc.d script attempts to correct problems
which may have been introduced by booting a netbsd-current kernel from between April of 2003 and January 2004. For more information see <http://mail-index.NetBSD.org/current-users/2004/01/11/0022.html> This script was developed as a response to NetBSD pr install/25138 This should not be added to the Makefile or the default install until it has been further tested
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dbj
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187
etc/rc.d/fixsb
Executable file
187
etc/rc.d/fixsb
Executable file
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#!/bin/sh
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#
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# $NetBSD: fixsb,v 1.1 2004/04/16 14:52:52 dbj Exp $
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#
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# PROVIDE: fixsb
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# REQUIRE: localswap
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# BEFORE: fsck
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. /etc/rc.subr
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name="fixsb"
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start_cmd="fsck_start"
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stop_cmd=":"
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# This rc.d script attempts to correct problems with ffs1 filesystems
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# which may have been introduced by booting a netbsd-current kernel
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# from between April of 2003 and January 2004. For more information
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# see <http://mail-index.NetBSD.org/current-users/2004/01/11/0022.html>
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# This script was developed as a response to NetBSD pr install/25138
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# Additional prs regarding the original issue include:
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# bin/17910 kern/21283 kern/21404 port-macppc/23925 port-macppc/23926
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#
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fstab=/etc/fstab
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#verbose=1
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# This shell function extracts the `ffs superblock' of the file
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# provided as its argument and tests for the following condition:
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# ((fs_magic == FS_UFS1_MAGIC) || fs_magic == FS_UFS1_MAGIC_SWAPPED) &&
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# (fs_sbsize == fs_maxbsize) && !(fs_old_flags & FS_FLAGS_UPDATED)
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#
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# return status is based on status of last filesystem checked:
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# 0 for botched superblock
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# 1 for filesystem does not appear to be ffs1 filesystem
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# 3 for ok fslevel 3 filesystem
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# 4 for ok fslevel 4 filesystem
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#
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# dbj@netbsd.org 2004-04-12T18:15:06-0400
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check_part()
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{
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# The following are 'cat -v' representations of the ffs1 magic number:
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fsmagicn="^@^A^YT" # 0x00011954 FS_UFS1_MAGIC
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fsmagics="T^Y^A^@" # 0x54190100 FS_UFS1_MAGIC_SWAPPED
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# In each of the foo=`dd | dd | cat -v` pipelines below, the first dd command reads in
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# the superblock using block aligned i/o so that it works on a raw character device.
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# The second dd extracts the exact field from the superblock that we with to
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# read. The data is put through cat -v to avoid having binary data in shell strings.
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if [ ! -z "${verbose}" ]; then
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echo -n "Checking $1 ... " 1>&2
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fi
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# First we extract the superblock magic number field:
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magic="`(dd if="$1" bs=8192 skip=1 count=1 | dd bs=1 count=4 skip=1372 | cat -v) 2> /dev/null`"
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# First we check if the magic number is valid either swapped or unswapped:
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if [ "${magic}" = "${fsmagicn}" -o "${magic}" = "${fsmagics}" ]; then
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# Then we read fs_bsize, fs_maxbsize and fs_old_flags fields from the disk:
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bsize="`(dd if="$1" bs=8192 skip=1 count=1 | dd bs=1 count=4 skip=48 | cat -v) 2> /dev/null`"
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maxbsize="`(dd if="$1" bs=8192 skip=1 count=1 | dd bs=1 count=4 skip=860 | cat -v) 2> /dev/null`"
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oldflags="`(dd if="$1" bs=8192 skip=1 count=1 | dd bs=1 count=1 skip=211 | cat -v) 2> /dev/null`"
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if [ ! -z "${debug}" ]; then
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echo "$1: magic=${magic} bsize=${bsize} maxbsize=${maxbsize} oldflags=${oldflags}" 1>&2
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fi
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# Compare the fs_bsize with fs_maxbsize to see if they are the same
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if [ "${bsize}" = "${maxbsize}" ]; then
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# Now check to see if the high bit of fs_old_flags is set.
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case "${oldflags}" in
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# Since the shell variable is the cat -v output, the
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# high bit is indicated in the variable with the prefix M-
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M-*)
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if [ ! -z "${verbose}" ]; then
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echo "file system looks ok at fslevel 4." 1>&2
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return 4
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fi
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;;
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# if the high bit of fs_old_flags is not set, then there is a problem
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*)
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if [ ! -z "${verbose}" ]; then
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echo "file system has botched superblock upgrade." 1>&2
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fi
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return 0
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;;
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esac
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fi # [ "${bsize}" = "${maxbsize}" ]
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else # ! [ "${magic}" = "${fsmagicn}" -o "${magic}" = "${fsmagics}" ]
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if [ ! -z "${verbose}" ]; then
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echo "does not appear to be an ffs1 filesystem." 1>&2
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fi
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return 1
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fi # ! [ "${magic}" = "${fsmagicn}" -o "${magic}" = "${fsmagics}" ]
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if [ ! -z "${verbose}" ]; then
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echo "file system looks ok at fslevel 3." 1>&2
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fi
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return 3
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}
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# This extracts raw ufs partitions to be fsck'ed from the file ${fstab}
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parse_fstab()
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{
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for l in 1 2; do
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sed -e '/^#/d' -e 's,/dev/,&r,' "${fstab}" 2> /dev/null | \
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while read d m t o b f err; do
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if [ \( "$t" = "ffs" -o "$t" = "ufs" \) -a "$f" = "$l" ]; then
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echo "$d"
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fi
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done
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done
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}
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stop_boot()
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{
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# Terminate the process (which may include the parent /etc/rc)
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# if booting directly to multiuser mode.
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#
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if [ "$autoboot" = yes ]; then
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kill -TERM $$
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fi
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exit 1
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}
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do_fsck()
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{
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# During fsck ignore SIGQUIT
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fsck_ffs ${1+"$@"}
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case $? in
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0)
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;;
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2)
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stop_boot
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;;
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4)
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echo "Rebooting..."
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reboot
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echo "Reboot failed; help!"
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stop_boot
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;;
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8)
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echo "Automatic file system check failed; help!"
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stop_boot
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;;
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12)
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echo "Boot interrupted."
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stop_boot
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;;
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130)
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stop_boot
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;;
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*)
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echo "Unknown error; help!"
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stop_boot
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;;
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esac
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}
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fsck_start()
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{
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if [ -e /fastboot ]; then
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echo "Fast boot: skipping disk checks."
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else
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# During fsck ignore SIGQUIT
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trap : 3
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echo "Checking for botched superblock upgrades:"
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for p in `parse_fstab`; do
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if check_part "$p"; then
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echo "Repairing partition $p"
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do_fsck -p -b 16 -c 4 "$p"
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do_fsck -p -c 3 "$p"
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fi
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done
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fi
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}
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load_rc_config $name
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run_rc_command "$1"
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