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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2017 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test 294
#
# Test readdir on fragmented multi-fsb dir blocks
#
# If the readahead map ends with a partial multi-fsb dir
# block, the loop at the end of xfs_dir2_leaf_readbuf() may
# walk off the end of the mapping array, read garbage,
# corrupt the loop control counter, and never return.
#
# Failure is a hang; KASAN should also catch this.
#
. ./common/preamble
_begin_fstest auto dir metadata prealloc punch
# Import common functions.
. ./common/filter
# real QA test starts here
# Modify as appropriate.
_supported_fs xfs
_require_scratch
_require_test_program "punch-alternating"
_require_xfs_io_command "falloc"
_require_xfs_io_command "fpunch"
# We want to mkfs with a very specific geometry
MKFS_OPTIONS=""
_scratch_mkfs "-d size=512m -n size=8192 -i size=1024" >> $seqres.full 2>&1 \
|| _fail "mkfs failed"
_scratch_mount
# Make a ton of mostly-empty inode clusters so we can always
# make more inodes
mkdir $SCRATCH_MNT/tmp
for I in `seq 1 10000`; do touch $SCRATCH_MNT/tmp/$I; done
# These mostly-empty clusters will live here:
mkdir $SCRATCH_MNT/clusters
for I in `seq 1 32 10000`; do
mv $SCRATCH_MNT/tmp/$I $SCRATCH_MNT/clusters;
done
rm -rf $SCRATCH_MNT/tmp
# Make our test dir with a couple blocks, should be contiguous
mkdir $SCRATCH_MNT/testdir
# roughly 20 chars per file
for I in `seq 1 100`; do
touch $SCRATCH_MNT/testdir/12345678901234567890$I;
done
# File to fragment:
$XFS_IO_PROG -f -c "falloc 0 70m" $SCRATCH_MNT/fragfile ||
_fail "Could not allocate space"
# Now completely fragment freespace.
# Consume most of it:
space=$(stat -f -c '%f * %S * 95 / 100' $SCRATCH_MNT | $BC_PROG)
$XFS_IO_PROG -f -c "falloc 0 $space" $SCRATCH_MNT/fillfile ||
_fail "Could not allocate space"
df -h $SCRATCH_MNT >> $seqres.full 2>&1
# Fill remaining space; let this run to failure
dd if=/dev/zero of=$SCRATCH_MNT/spacefile1 oflag=direct >> $seqres.full 2>&1
# Fragment our all-consuming file
$here/src/punch-alternating $SCRATCH_MNT/fragfile >> $seqres.full 2>&1
# Punching might have freed up large-ish swaths of metadata
# Consume hopefully any remaining contiguous freespace
# (and then some for good measure)
dd conv=fsync if=/dev/zero of=$SCRATCH_MNT/spacefile2 bs=1M count=64 >> $seqres.full 2>&1
# Now populate the directory so that it must allocate these
# fragmented blocks
for I in `seq 1 1400`; do
touch $SCRATCH_MNT/testdir/12345678901234567890$I;
done
# Now traverse that ugly thing!
find $SCRATCH_MNT/testdir | sort | _filter_scratch | md5sum
status=0
exit
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