#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2020 SUSE Linux Products GmbH.  All Rights Reserved.
#
# FS QA Test No. 045
#
# Test subdirectory limit of ext4.
# We create more than 65000 subdirectories on the ext4 filesystem.
#
. ./common/preamble
_begin_fstest auto dir

SHORT_DIR=1
LONG_DIR=2

# Import common functions.
. ./common/filter

# real QA test starts here
_supported_fs ext4

_require_scratch
_require_test_program "t_create_short_dirs"
_require_test_program "t_create_long_dirs"
_require_dumpe2fs "$DUMPE2FS_PROG" dumpe2fs

echo "Silence is golden"

# Run a test case
# $1: Number of directories to create
# $2: create short dir or long dir
# $3: parent directory
workout()
{
       local dir_name_len=""
       if [ $2 -eq $SHORT_DIR ]; then
               dir_name_len="short name"
       else
               dir_name_len="long name"
       fi

       echo "Num of dirs to create: $1, Dir name len: $dir_name_len, " \
               "Parent dir: $3" >> $seqres.full

       _scratch_mkfs "-O extent,dir_nlink,dir_index -I 256" >> $seqres.full 2>&1
       _scratch_mount

       # create directories
       mkdir -p $3 2> /dev/null

       if [ $2 -eq $SHORT_DIR ]; then
               $here/src/t_create_short_dirs $1 $3
       else
               $here/src/t_create_long_dirs $1 $3
       fi

       if [ $? -ne 0 ]; then
               nr_dirs=`ls $3 | wc -l`
               echo "Failed to create directories - $nr_dirs"
               _scratch_unmount
               return
       fi

       # delete directories
       cd $3
       ls | xargs rmdir
       if [ $? -ne 0 ]; then
               echo "Failed to remove directories in $3"
               cd - > /dev/null
               _scratch_unmount
               return
       fi
       cd - > /dev/null
       _scratch_unmount

       # check dir_nlink is set
       $DUMPE2FS_PROG -h $SCRATCH_DEV 2>> $seqres.full | grep '^Filesystem features' | grep -q dir_nlink
       if [ $? -ne 0 ]; then
               echo "Feature dir_nlink is not set, please check $seqres.full for detail"
               return
       fi
}

# main
DIR_NUM=65537
DIR_LEN=( $SHORT_DIR $LONG_DIR )
PARENT_DIR="$SCRATCH_MNT/subdir"

for ((i = 0; i < 2; i++)); do
       workout $DIR_NUM ${DIR_LEN[$i]} $PARENT_DIR
done

status=0
exit