create_job_tmpdir

#! /usr/bin/bash

# Input (environment):
#
#   MXQ_JOBID   : job ident
#   MXQ_SIZE    : size in GB
#   MXQ_UID     : uid

# Output:
#
#   /dev/shm/mxqd/tmp/$JOBID  mounted, space from /scratch/local2

tmpdir=/scratch/local2/mxqd/tmp
mntdir=/dev/shm/mxqd/mnt/job
filename=$tmpdir/$MXQ_JOBID.tmp
mountpoint=$mntdir/$MXQ_JOBID

umask 006
mkdir -p $tmpdir
mkdir -p $mntdir

status=1;

if fallocate -l ${MXQ_SIZE}G $filename; then
    if loopdevice=$(losetup --find --show $filename); then
        if mkfs.ext4 \
                -q \
                -m 0 \
                -E nodiscard,mmp_update_interval=300,lazy_journal_init=1,root_owner=$MXQ_UID:0 \
                -O '64bit,ext_attr,filetype,^has_journal,huge_file,inline_data,^mmp,^quota,sparse_super2' \
                $loopdevice \
                && mkdir -p $mountpoint && mount -Odata=writeback,barrier=0  $loopdevice $mountpoint; then
            rmdir $mountpoint/lost+found
            status=0
        fi
        losetup -d $loopdevice
    fi
    rm $filename
else
    test -e $filename && rm $filename
fi
exit $status