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simply logic and flow of check_part function

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dbj 2004-04-21 18:27:26 +00:00
parent e133d13e80
commit 48019a3a47
1 changed files with 31 additions and 38 deletions
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69
etc/rc.d/fixsb
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@ -1,6 +1,6 @@
#!/bin/sh
#
# $NetBSD: fixsb,v 1.7 2004/04/21 18:06:06 dbj Exp $
# $NetBSD: fixsb,v 1.8 2004/04/21 18:27:26 dbj Exp $
#
# PROVIDE: fixsb
@ -59,52 +59,45 @@ readsbfield()
# dbj@netbsd.org 2004-04-12T18:15:06-0400
check_part()
{
verbose -n "Checking $1 ... "
# The following are 'cat -v' representations of the ffs1 magic number:
fsmagicn="^@^A^YT" # 0x00011954 FS_UFS1_MAGIC
fsmagics="T^Y^A^@" # 0x54190100 FS_UFS1_MAGIC_SWAPPED
verbose -n "Checking $1 ... "
# First we extract the superblock magic number field.
# We use cat -v to avoid having binary data in shell strings.
magic="$( readsbfield "$1" 1372 4 | cat -v)"
# First we check if the magic number is valid either swapped or unswapped:
if [ "${magic}" = "${fsmagicn}" -o "${magic}" = "${fsmagics}" ]; then
# Then we read fs_bsize, fs_maxbsize and fs_old_flags fields from the disk:
bsize="$( readsbfield "$1" 48 4 | cat -v)"
maxbsize="$( readsbfield "$1" 860 4 | cat -v)"
oldflags="$( readsbfield "$1" 211 1 | cat -v)"
# Compare the fs_bsize with fs_maxbsize to see if they are the same
if [ "${bsize}" = "${maxbsize}" ]; then
# Now check to see if the high bit of fs_old_flags is set.
case "${oldflags}" in
# Since the shell variable is the cat -v output, the
# high bit is indicated in the variable with the prefix M-
M-*)
verbose "file system looks ok at fslevel 4."
return 4
;;
# if the high bit of fs_old_flags is not set, then there is a problem
*)
verbose "file system has botched superblock upgrade."
return 0
;;
esac
fi # [ "${bsize}" = "${maxbsize}" ]
else # ! [ "${magic}" = "${fsmagicn}" -o "${magic}" = "${fsmagics}" ]
# Then we check if the magic number is valid either swapped or unswapped:
if [ "${magic}" != "${fsmagicn}" -a "${magic}" != "${fsmagics}" ]; then
verbose "does not appear to be an ffs1 filesystem."
return 1
fi # ! [ "${magic}" = "${fsmagicn}" -o "${magic}" = "${fsmagics}" ]
verbose "file system looks ok at fslevel 3."
return 3
fi
# Then we read fs_old_flags fields from disk
# And check the value of its high bit.
oldflags="$( readsbfield "$1" 211 1 | cat -v)"
case "${oldflags}" in
# Since the shell variable is the cat -v output, the
# high bit is indicated in the variable with the prefix M-
M-*)
verbose "file system looks ok at fslevel 4."
return 4
;;
esac
# Then we read fs_bsize, fs_maxbsize fields from the disk:
bsize="$( readsbfield "$1" 48 4 | cat -v)"
maxbsize="$( readsbfield "$1" 860 4 | cat -v)"
# Compare the fs_bsize with fs_maxbsize to see if they are the same
if [ "${bsize}" != "${maxbsize}" ]; then
verbose "file system looks ok at fslevel 3."
return 3
fi
verbose "file system has botched superblock upgrade."
return 0
}
# This extracts raw ufs partitions to be fsck'ed from the file ${fstab}