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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2012 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test No. ext4/042 (was shared/289)
#
# Test overhead & df output for extN filesystems
#
. ./common/preamble
_begin_fstest auto quick
# Import common functions.
. ./common/filter
# real QA test starts here
# Modify as appropriate.
_supported_fs ext2 ext3 ext4
_require_scratch
_scratch_mkfs >> $seqres.full 2>&1
# Get the honest truth about block counts straight from metadata on disk
TOTAL_BLOCKS=`dumpe2fs -h $SCRATCH_DEV 2>/dev/null \
| awk '/Block count:/{print $3}'`
FREE_BLOCKS=`dumpe2fs -h $SCRATCH_DEV 2>/dev/null \
| awk '/Free blocks:/{print $3}'`
OVERHEAD=$(($TOTAL_BLOCKS-$FREE_BLOCKS))
# bsddf|minixdf
# Set the behaviour for the statfs system call. The minixdf
# behaviour is to return in the f_blocks field the total number of
# blocks of the filesystem, while the bsddf behaviour (which is
# the default) is to subtract the overhead blocks used by the ext2
# filesystem and not available for file storage.
# stat -f output looks like this; we get f_blocks from that, which
# varies depending on the df mount options used below:
# File: "/mnt/test"
# ID: affc5f2b2f57652 Namelen: 255 Type: ext2/ext3
# Block size: 4096 Fundamental block size: 4096
# Blocks: Total: 5162741 Free: 5118725 Available: 4856465
# Inodes: Total: 1313760 Free: 1313749
_scratch_mount "-o minixdf"
MINIX_F_BLOCKS=`stat -f $SCRATCH_MNT | awk '/^Blocks/{print $3}'`
_scratch_unmount
_scratch_mount "-o bsddf"
BSD_F_BLOCKS=`stat -f $SCRATCH_MNT | awk '/^Blocks/{print $3}'`
_scratch_unmount
# Echo data to $seqres.full for analysis
echo "Overhead is $OVERHEAD blocks out of $TOTAL_BLOCKS ($FREE_BLOCKS free)" >> $seqres.full
echo "MINIX free blocks $MINIX_F_BLOCKS" >> $seqres.full
echo "BSD free blocks $BSD_F_BLOCKS" >> $seqres.full
# minix should be exactly equal (hence tolerance of 0)
_within_tolerance "minix f_blocks" $MINIX_F_BLOCKS $TOTAL_BLOCKS 0 -v
# bsd should be within ... we'll say 1% for some slop
_within_tolerance "bsd f_blocks" $BSD_F_BLOCKS $(($TOTAL_BLOCKS-$OVERHEAD)) 1% -v
# success, all done
status=0
exit
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