scsi.agent

这是关于usb等方面的热拔插源代码

#!/bin/sh
#
# SCSI hotplug agent for 2.5 kernels 
#
#	ACTION=add
#	DEVPATH=devices/scsi0/0:0:0:0
#

cd /etc/hotplug
. ./hotplug.functions

case $ACTION in

add)
    # 2.5.50 kernel bug: this happens sometimes
    if [ ! -d /sys/$DEVPATH ]; then
	mesg "bogus sysfs DEVPATH=$DEVPATH"
	exit 1
    fi

    TYPE_ATTR=/sys$DEVPATH/type

    # Possibly sleep here to try and avoid races with scsi attributes and block
    # devices
    count=10
    while [ ! -f $TYPE_ATTR -a $count -gt 0 ]
    do
	# We seem to always hit this now, so don't output any message.
	debug_mesg "waiting for $TYPE_ATTR"
	sleep 1
	count=$(($count-1))
    done

    if [ ! -f $TYPE_ATTR ]
    then
    	mesg "Attribute $TYPE_ATTR does not exist"
	exit 1
    fi

    TYPE=$(cat $TYPE_ATTR) 
    case "$TYPE" in
    # 2.5.51 style attributes; <scsi/scsi.h> TYPE_* constants
    0)		TYPE=disk ; MODULE=sd_mod ;;
    # FIXME some tapes use 'osst' not 'st'
    1)		TYPE=tape ; MODULE=st ;;
    2)		TYPE=printer ; MODULE=sg ;;
    3)		TYPE=processor ; MODULE=sg ;;
    4)		TYPE=worm ; MODULE=sr_mod ;;
    5)		TYPE=cdrom ; MODULE=sr_mod ;;
    6)		TYPE=scanner ; MODULE=sg ;;
    7)		TYPE=mod ; MODULE=sd_mod ;;
    8)		TYPE=changer ; MOUDLE=sg ;;
    9)		TYPE=comm ; MODULE=sg ;;
    14)		TYPE=enclosure ; MODULE=sg ;;
    esac
    if [ "$MODULE" != "" ]; then
	mesg "$TYPE at $DEVPATH"
	modprobe $MODULE
    else
	debug_mesg "how to add device type=$TYPE at $DEVPATH ??"
    fi
    ;;

*)
    debug_mesg SCSI $ACTION event not supported
    exit 1
    ;;

esac