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#! /usr/bin/env bash
# copy a linear file from srcFile to destination SMRDisk in a loop until writeSize MBs is written
# SMRDisk is the SMR Host Aware / Host Managed Disk eg. /dev/sdb
usage(){
echo "linearSMRCopy.sh <srcFile> <SMRDisk> <writeSize (MB)>"
}
if [ "$#" -lt 3 ]; then
usage
exit
fi
if [ "$(id -u)" != "0" ]; then
echo "Please run as sudo user"
exit
fi
if which zbc_open_zone > /dev/null 2>&1 && which zbc_read_zone > /dev/null 2>&1 && which zbc_write_zone > /dev/null 2>&1 ; then
echo "libzbc commands present... refreshing zones"
# reset all write pointers before starting to write
sudo zbc_reset_write_ptr /dev/sdb -1
else
echo "libzbc commands not detected. Please install libzbc"
exit
fi
srcFile=$1
SMRDisk=$2
writeSize=$3
iosize=10240
numberOfSectors=$(($writeSize * 2048))
smrZoneStart=33554432 # TODO query this from SMR drive
#dd if=$srcFile of=$destDisk seek=$smrZoneStart bs=512
fileSize=`stat --printf="%s" $srcFile`
if [ "$(($fileSize % 512))" -ne 0 ]; then
echo "$srcFile not 512 byte aligned"
exit
fi
sectorsLeftToWrite=$(($fileSize / 512))
znum=64 # TODO query this from SMR Drive
zoneLength=524288 # number of sectors in each zone TODO query from SMR drive
writeOffset=$smrZoneStart
sectorsLeftToWrite=$numberOfSectors
echo "write begin sectors Left = $sectorsLeftToWrite, writeOffset = $writeOffset zone Num = $znum"
while [ "$sectorsLeftToWrite" -gt 0 ];
do
sudo zbc_open_zone $SMRDisk $znum
sudo time zbc_write_zone -f $srcFile -loop $SMRDisk $znum $iosize
sudo zbc_close_zone /dev/sdb $znum
writeOffset=$(($writeOffset+$zoneLength))
znum=$(($znum+1))
sectorsLeftToWrite=$(($sectorsLeftToWrite - $zoneLength))
done
echo "write end sectors Left = $sectorsLeftToWrite, writeOffset = $writeOffset zone Num = $znum"
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