问如何获取文件的块设备名称？

EN

#!/bin/bash
#
# Given a file identify the block device on which it resides
#

PROGNAME=`basename $0`
STATUS=0
VERBOSE=0

showUsage() {
    echo "usage:"
    echo "  $PROGNAME <filename>"
}

showHelp() {
    showUsage
    echo
    echo "$PROGNAME is a simple utility to identify the block device on which a file resides"
}

usageError() {
    if [ -z "$1" ]; then
    echo "$PROGNAME: error: incorrect usage" >&2
    else
    echo "$PROGNAME: error: incorrect usage: $1" >&2
    fi
    showUsage >&2
    exit 1
}

reportError() {
    echo "$PROGNAME: error: $1" >&2
    STATUS=1
}

reportFileError() {    
    echo "$1: error: $2" >&2
    STATUS=1
}

checkStatus() {
    RET=$?
    if [ $RET -ne 0 ]; then
    STATUS=$RET
    reportError "$1"
    exit $RET
    fi
}

while [ $# -gt 0 ]; do
   case "$1" in
   --)
      shift
      break;;
   --help)
      showHelp
      exit 0
      break;;
   --verbose)
      VERBOSE=1
      shift;;
   --*)
      usageError "unknown option \"$1\""
      shift;;
   *)
      break;;
   esac
done

FILE="$1"
if [ $VERBOSE -eq 1 ]; then
    echo FILE=$FILE
fi
FILE=`readlink -f $FILE`

if [ -z "$1" ]; then
    usageError "expected a filename"
    exit 1
elif [ ! -e $FILE ]; then
    reportFileError "$FILE" "file does not exist"
    exit 1
fi

FILESYSTEM=`findmnt -no source -T $FILE`
checkStatus "could not identify mount point"


if [ $VERBOSE -eq 1 ]; then
    echo FILESYSTEM=$FILESYSTEM
fi

FS=`basename $FILESYSTEM`
SYSLINE=`grep -rs $FS /sys/devices 2>/dev/null`
test ! -z "$SYSLINE" 
checkStatus "could not find device in /sys/devices"

if [ $FS == "fuse" ]; then
    reportFileError "$FILE" "is on a fuse filesystem"
    exit 1
fi

echo $SYSLINE | grep -q virtual
if [ $? -eq 0 ]; then
    LOGICALVOLUME=1
    if [ $VERBOSE -eq 1 ]; then
    echo "file is on a logical volume"
    fi
else
    LOGICALVOLUME=0

fi

DEVICENO=`lsblk | grep $FS | awk '{ print $2; }' | head -n 1`
checkStatus "could identify device number"
test ! -z $DEVICENO
checkStatus "could identify device number"

if [ $VERBOSE -eq 1 ]; then
    echo "Device number $DEVICENO"
fi

if [ $LOGICALVOLUME -eq 1 ]; then
    DEVDIR=`grep -rs ${DEVICENO}$ /sys/devices/ 2>&1`
    DEVDIR=`dirname $DEVDIR`    
    DEVICE=`ls $DEVDIR/slaves | head -n 1`
    if [ $VERBOSE -eq 1 ]; then
    echo DEVICE=/dev/$DEVICE
    fi
    DEVICENO=`lsblk | grep $DEVICE | awk '{ print $2; }' | head -n 1`
    checkStatus "could identify parent device number"
    if [ $VERBOSE -eq 1 ]; then
    echo "Parent Device number $DEVICENO"
    fi
fi
    
# The first grep does not like the first colon so we double grep
# Maybe a /sys pecularity?
DEVLINE=`grep -rs ${DEVICENO}$ /sys/devices/ 2>&1 | grep :${DEVICENO}`
checkStatus "could identify device from number in sys"

DEVICE=`echo $DEVLINE | sed -e s_.*/block/__ | cut -f 1 -d/`
if [ $VERBOSE -eq 1 ]; then
    echo -n "block device: "
fi
echo "/dev/$DEVICE"

exit $STATUS

>./getblkdev.sh --verbose /home
FILE=/home
FILESYSTEM=/dev/mapper/rhel-home
file is on a logical volume
Device number 253:2
DEVICE=/dev/sda2
Parent Device number 8:2
block device: /dev/sda

>./getblkdev.sh --verbose /boot
FILE=/boot
FILESYSTEM=/dev/sda1
Device number 8:1
block device: /dev/sda