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* udev on Fedore 5
@ 2006-08-03  5:14 Piet Delaney
  2006-08-03  8:39 ` Greg KH
  0 siblings, 1 reply; 2+ messages in thread
From: Piet Delaney @ 2006-08-03  5:14 UTC (permalink / raw)
  To: linux-hotplug

I wasn't able to login to your Fedora 5 (10.10.111.220).
I tried my AMD hammer at home (hammer.piet.net) and looked
at the Fedora 5 udev scripts. I can't see what the gento 
/sbin/start_udev might be doing to boost Performance so much
and didn't see the udev daemon stuff we saw on your system.
Perhaps it's probing the modules to pre-awaken them. I'm not
using modules, so I doubt it would have an effect.
--------------------------------------------------------------
			/sbin/start_udev
--------------------------------------------------------------

#!/bin/sh
#
# start_udev
#
# script to initialize /dev by using udev.
#
# Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
#
# Released under the GPL v2 only.
#
# This needs to be run at the earliest possible point in the boot
# process.
#
# Based on the udev init.d script
#
# Thanks go out to the Gentoo developers for proving
# that this is possible to do.
#
# Yes, it's very verbose, feel free to turn off all of the echo calls,
# they were there to make me feel better that everything was working
# properly during development...
#
# don't use udev if sysfs is not mounted.

sysfs_dir=/sys

[ -d $sysfs_dir/class ] || exit 1
[ -r /proc/mounts ] || exit 1
[ -x /sbin/udev ] || exit 1
[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf


. /etc/init.d/functions

prog=udev
bin=/sbin/udev
udevd=/sbin/udevd
MAKEDEV="/sbin/MAKEDEV"
xargs_simple () {
        if [ "$1" = "-n" ]; then
                shift
                MAXNR="$1"
                shift
        else
                MAXNR\x100
        fi
        NR=$MAXNR
        ARGS=""
        [ -z "$1" ] && set echo

        while read line; do
                if [ $NR -gt 0 ]; then
                        ARGS="$ARGS $line"
                        NR=$[$NR - 1]
                else
                        "$@" $ARGS
                        NR=$MAXNR
                        ARGS="$line"
                fi
        done
        if [ -n "$ARGS" ]; then
                "$@" $ARGS
        fi
}
make_extra_nodes () {
        ln -snf /proc/self/fd $udev_root/fd
        ln -snf /proc/self/fd/0 $udev_root/stdin
        ln -snf /proc/self/fd/1 $udev_root/stdout
        ln -snf /proc/self/fd/2 $udev_root/stderr
        ln -snf /proc/kcore $udev_root/core

        [ -d $udev_root/pts ] || mkdir -m 0755 $udev_root/pts
        [ -d $udev_root/shm ] || mkdir -m 0755 $udev_root/shm
        [ -a /dev/MAKEDEV ] || ln -s $MAKEDEV /dev/MAKEDEV;

        if [ -x $MAKEDEV ]; then
                for i in /etc/udev/makedev.d/*.nodes; do
                        if [ -f "$i" ]; then
                                cat "$i" | sed -e 's,#.*,,g' | \
                                        xargs_simple -n 100 $MAKEDEV -x
                        fi
                done
        fi
        pushd /etc/udev/devices &> "$udev_root/null"
        set *
        if [ "$1" != "*" ]; then
                cp -ar "$@" $udev_root/
                pushd "$udev_root" &> "$udev_root/null"
                [ -x /sbin/restorecon ] && /sbin/restorecon "$@"
                popd &> "$udev_root/null"
        fi
        popd &> "$udev_root/null"
}

# we cannot use /usr/bin/find here
find_d () {
        where=$1
        what=$2
        found=""
        for f in $where/*; do
                if [ -d "$f" -a ! -L "$f" ]; then
                        if [ "$f" != "${f%%$what}" ];then
                                # make sure we are at the path end
                                # we have no dirname and basename
                                rest="${f#*$what}"
                                [ "${rest##*/}" = "$rest" ] &&
found="$found $f"
                        fi
                        found="$found $(find_d $f $what)"
                fi
        done
        echo "$found"
}

# we cannot use /usr/bin/find here
find_f () {
        where=$1
        what=$2
        found=""
        for f in $where/*; do
                if [ -d "$f" -a ! -L "$f" ]; then
                        found="$found $(find_f $f $what)"
                elif [ -e "$f" ]; then
                        [ "$where/" = "${f%$what}" ] && found="$found
$f"
                fi
        done
        [ -n "$found" ] && echo "$found"
}

kill_udevd() {
        if [ -x /sbin/pidof ]; then
                pid=`/sbin/pidof -x udevd`
                [ -n "$pid" ] && kill $pid
        fi
}


# call hotplug with the scsi devices
scsi_replay () {
        HOTPLUG=$(cat /proc/sys/kernel/hotplug)
        [ -z "$HOTPLUG" ] && return 1

        scsi_hosts=$(find_d /sys/devices host\*)
        SEQNUM=1

        for host in $scsi_hosts;do
                [ -d $host ] || continue
                devs=$(find_f $host type)
                for dev in $devs;do
                        [ -f $dev ] || continue
                        export SEQNUM
                        DEVPATH=${dev%/type}
                        DEVPATH=${DEVPATH#/sys}
                        export DEVPATH
                        export ACTION­d
                        $HOTPLUG scsi_device
                        SEQNUM=$[$SEQNUM + 1]
                        $HOTPLUG scsi
                        SEQNUM=$[$SEQNUM + 1]
                done
        done
        return 0
}

164,1         60%

ide_scan() {
    if [ ! -d /proc/ide ]; then
        return 1
    fi
    for i in /proc/ide/*/media; do
        read media < "$i"
        case "$media" in
            disk)
                module=ide-disk
                ;;
            cdrom)
                module=ide-cd
                ;;
            tape)
                module=ide-tape
                ;;
            floppy)
                module=ide-floppy
                ;;
            *)
                module=ide-generic
                ;;
        esac
        /sbin/modprobe $module
    done
    return 0
}


export ACTION­d
prog=udev
ret=0
STRING=$"Starting $prog: "
# propagate $udev_root from /sys
echo -n "$STRING "

# mount the tmpfs on ${udev_root%/}, if not already done
LANG=C awk "\$2 = \"${udev_root%/}\" && \$3 = \"tmpfs\" { exit
1 }" /proc/mounts && {
        if LANG=C fgrep -q "none ${udev_root%/}/pts " /proc/mounts; then
                PTSDIR=$(mktemp -d)
                mount --move $udev_root/pts "$PTSDIR"
        fi
        if LANG=C fgrep -q "none ${udev_root%/}/shm " /proc/mounts; then
                SHMDIR=$(mktemp -d)
                mount --move $udev_root/shm "$SHMDIR"
        fi
        mount -n -o mode\a55 -t tmpfs none "$udev_root"
        mkdir -m 0755 $udev_root/pts
        mkdir -m 0755 $udev_root/shm
        if [ -n "$PTSDIR" ]; then
                mount --move "$PTSDIR" $udev_root/pts
                rmdir "$PTSDIR"
        fi
        if [ -n "$SHMDIR" ]; then
                mount --move "$SHMDIR" $udev_root/shm
                rmdir "$SHMDIR"
        fi

        ret=$[$ret + $?]
}

rm -fr "$udev_db"
make_extra_nodes
kill_udevd > "$udev_root/null" 2>&1
scsi_replay > "$udev_root/null" 2>&1
ret=$[$ret + $?]
ide_scan > "$udev_root/null" 2>&1
/sbin/udevstart
ret=$[$ret + $?]
[ $ret -eq 0 ] && success $"$STRING" || failure $"$STRING"
echo
exit 0




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^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2006-08-03  8:39 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
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2006-08-03  5:14 udev on Fedore 5 Piet Delaney
2006-08-03  8:39 ` Greg KH

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