139 lines
2.5 KiB
Plaintext
139 lines
2.5 KiB
Plaintext
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#! /bin/sh
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# blktrace Mount debugfs on boot
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### BEGIN INIT INFO
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# Provides: mountdebugfs
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# Required-Start: $local_fs $remote_fs mountkernfs
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# Required-Stop: $local_fs $remote_fs
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# Should-Start:
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# Should-Stop:
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# Default-Start: 2 3 4 5
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# Default-Stop: 0 1 6
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# Short-Description: Mount debugfs on /sys/kernel/debug
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# Description: Mount debugfs on /sys/kernel/debug
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### END INIT INFO
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# load LSB functions (log_success_msg etc)
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. /lib/lsb/init-functions
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# main mount point
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mount_dir=/sys/kernel/debug
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# check if /proc/mounts exists
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if ! [ -r /proc/mounts ]
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then
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log_failure_msg "Failed! Couldn't read /proc/mounts."
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exit 1
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fi
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# no need to do anything if blktrace isn't installed
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if ! [ -x /usr/sbin/blktrace ]
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then
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exit 0
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fi
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# find where (if anywhere) debugfs is mounted
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mountpoints=$(
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awk '$3 == "debugfs" { print $2 }' < /proc/mounts
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)
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mount_debugfs ()
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{
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# check if any of the current mountpoints is /sys/kernel/debug
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found_syskerneldebug=0
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for d in $mountpoints
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do
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if [ $d = $mount_dir ]
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then
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found_syskerneldebug=1
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fi
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done
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if [ $found_syskerneldebug -eq 1 ]
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then
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log_success_msg "Debugfs is already mounted on $mount_dir; nothing to do";
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exit 0
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fi
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# check that debugfs is supported by the kernel
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if ! [ $( awk -F\\t '$2 == "debugfs" { print $2 }' < /proc/filesystems ) ]
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then
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log_failure_msg "Can't mount debugfs: not supported by your kernel"
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exit 0
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fi
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# check that /sys/kernel exists
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the_dir=$( dirname $mount_dir )
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if ! [ -d $the_dir ]
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then
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log_failure_msg "Can't mount debugfs on $mountdir: $the_dir doesn't exist."
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exit 1
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fi
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# do the actual mounting
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if mount -t debugfs debugfs $mount_dir
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then
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log_success_msg "Mounted debugfs on $mount_dir"
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else
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log_failure_msg "Couldn't mount debugfs on $mount_dir"
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exit 1
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fi
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}
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umount_debugfs ()
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{
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if [ $mountpoints ]
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then
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for d in $mountpoints
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do
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if [ $d = $mount_dir ]
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then
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if umount $d
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then
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log_success_msg "Unmounted debugfs from $d"
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else
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log_failure_msg "Couln't unmount debugfs from $d"
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fi
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fi
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done
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else
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log_success_msg "Debugfs is not mounted; nothing to do."
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fi
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}
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show_status ()
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{
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if [ $mountpoints ]
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then
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for d in $mountpoints
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do
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log_success_msg "Debugfs is mounted on $d"
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done
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else
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log_success_msg "Debugfs is not mounted"
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fi
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}
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case "$1" in
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start)
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mount_debugfs
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;;
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stop)
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umount_debugfs
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;;
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restart|reload|force-reload)
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umount_debugfs
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exec $0 start
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;;
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status)
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show_status
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;;
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*)
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echo "Usage: $0 {start|stop|restart|reload|force-reload|status}"
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exit 1
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;;
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esac
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exit 0
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