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apfstests/tests/btrfs/178
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Filipe Manana ad91ed8a66 btrfs: test send after radical changes in a complex directory hierarchy 
Test an incremental send operation in a scenario where the relationship
of ancestor-descendant between multiple directories is inversed, and
where multiple directories that were previously ancestors of another
directory now become descendents of multiple directories that used to be
their ancestors in the parent snapshot. This used to trigger an
infinite loop in the kernel code.

This is motivated by a bug found in btrfs which is fixed by the following
patch for the linux kernel:

  "Btrfs: send, fix infinite loop due to directory rename dependencies"

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
2018-11-18 20:48:30 +08:00

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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2017 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/178
#
# Test an incremental send operation in a scenario where the relationship of
# ancestor-descendant between multiple directories is inversed, and where
# multiple directories that were previously ancestors of another directory now
# become descendents of multiple directories that used to be their ancestors in
# the parent snapshot. This used to trigger an infinite loop in the kernel code.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
tmp=/tmp/$$
status=1 # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15
_cleanup()
{
cd /
rm -fr $send_files_dir
rm -f $tmp.*
}
# get standard environment, filters and checks
. ./common/rc
. ./common/filter
# real QA test starts here
_supported_fs btrfs
_supported_os Linux
_require_test
_require_scratch
_require_fssum
send_files_dir=$TEST_DIR/btrfs-test-$seq
rm -f $seqres.full
rm -fr $send_files_dir
mkdir $send_files_dir
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
# The name of each directory corresponds to its inode number, to make it easier
# to debug since btrfs' send processes inodes in ascending order according to
# their number.
mkdir $SCRATCH_MNT/257
mkdir $SCRATCH_MNT/258
mv $SCRATCH_MNT/257 $SCRATCH_MNT/258/257
mkdir $SCRATCH_MNT/259
mkdir $SCRATCH_MNT/260
mkdir $SCRATCH_MNT/261
mkdir $SCRATCH_MNT/262
mkdir $SCRATCH_MNT/263
mkdir $SCRATCH_MNT/264
mv $SCRATCH_MNT/258 $SCRATCH_MNT/264/258
mkdir $SCRATCH_MNT/265
mkdir $SCRATCH_MNT/266
mv $SCRATCH_MNT/259 $SCRATCH_MNT/266/259
mv $SCRATCH_MNT/260 $SCRATCH_MNT/266/260
mv $SCRATCH_MNT/264 $SCRATCH_MNT/266/264
mv $SCRATCH_MNT/265 $SCRATCH_MNT/266/265
mkdir $SCRATCH_MNT/266/260/267
mkdir $SCRATCH_MNT/266/268
mkdir $SCRATCH_MNT/266/269
mv $SCRATCH_MNT/262 $SCRATCH_MNT/266/269/262
mkdir $SCRATCH_MNT/266/270
mkdir $SCRATCH_MNT/271
mv $SCRATCH_MNT/266 $SCRATCH_MNT/271/266
mkdir $SCRATCH_MNT/271/266/272
mv $SCRATCH_MNT/263 $SCRATCH_MNT/271/266/272/263
mkdir $SCRATCH_MNT/273
mkdir $SCRATCH_MNT/271/266/274
mv $SCRATCH_MNT/273 $SCRATCH_MNT/271/266/274/273
mkdir $SCRATCH_MNT/271/266/272/275
mv $SCRATCH_MNT/271 $SCRATCH_MNT/261/271
# Filesystem looks like:
#
# .
# |--- 261/
# |--- 271/
# |--- 266/
# |--- 259/
# |--- 260/
# | |--- 267
# |
# |--- 264/
# | |--- 258/
# | |--- 257/
# |
# |--- 265/
# |--- 268/
# |--- 269/
# | |--- 262/
# |
# |--- 270/
# |--- 272/
# | |--- 263/
# | |--- 275/
# |
# |--- 274/
# |--- 273/
#
$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
$SCRATCH_MNT/mysnap1 > /dev/null
$BTRFS_UTIL_PROG send -f $send_files_dir/1.snap \
$SCRATCH_MNT/mysnap1 2>&1 1>/dev/null | _filter_scratch
mv $SCRATCH_MNT/261/271/266/272/275 $SCRATCH_MNT/275
mv $SCRATCH_MNT/261/271/266/274 $SCRATCH_MNT/275/274
mv $SCRATCH_MNT/261/271/266/269/262 $SCRATCH_MNT/275/274/273/262
mv $SCRATCH_MNT/261/271/266/269 $SCRATCH_MNT/275/274/273/262/269
mv $SCRATCH_MNT/261/271/266/264/258/257 $SCRATCH_MNT/261/271/266/272
mv $SCRATCH_MNT/261/271/266/264/258 $SCRATCH_MNT/275/274/273/262/269/258
mv $SCRATCH_MNT/261/271 $SCRATCH_MNT/275/274/273/262/269/258/271
mv $SCRATCH_MNT/275/274/273/262/269/258/271/266/268 \
$SCRATCH_MNT/275/274/273/262/269/258/271/268
mv $SCRATCH_MNT/275/274/273/262/269/258/271/266/260/267 \
$SCRATCH_MNT/275/274/273/262/269/258/271/268/267
mv $SCRATCH_MNT/275/274/273/262/269/258/271/266/270 \
$SCRATCH_MNT/275/274/273/262/269/258/271/268/267/270
mv $SCRATCH_MNT/275/274/273/262/269/258/271/266/265 \
$SCRATCH_MNT/275/274/273/262/269/258/271/266/259/265
mv $SCRATCH_MNT/275/274/273/262/269/258/271/266/259 \
$SCRATCH_MNT/275/274/273/262/269/258/271/268/267/270/259
mv $SCRATCH_MNT/275/274/273/262/269/258/271/266/272/263 \
$SCRATCH_MNT/275/274/273/262/269/258/271/266/264/263
mv $SCRATCH_MNT/275/274/273/262/269/258/271/266/272 \
$SCRATCH_MNT/275/274/273/262/269/258/271/268/267/270/272
mv $SCRATCH_MNT/275/274/273/262/269/258/271/266/260 \
$SCRATCH_MNT/275/274/273/262/269/258/271/268/267/270/272/257/260
mv $SCRATCH_MNT/275/274/273/262/269/258/271/266/264 \
$SCRATCH_MNT/275/274/273/262/269/258/271/268/267/270/272/257/264
mv $SCRATCH_MNT/261 \
$SCRATCH_MNT/275/274/273/262/269/258/271/268/267/270/272/257/264/263/261
mv $SCRATCH_MNT/275/274/273/262/269/258/271/266 \
$SCRATCH_MNT/275/274/273/262/269/258/271/268/267/270/272/257/264/263/261/266
# Filesystem now looks like:
#
# .
# |-- 275/
# |-- 274/
# |-- 273/
# |-- 262/
# |-- 269/
# |-- 258/
# |-- 271/
# |-- 268/
# |-- 267/
# |-- 270/
# |-- 259/
# | |-- 265/
# |
# |-- 272/
# |-- 257/
# |-- 260/
# |-- 264/
# |-- 263/
# |-- 261/
# |-- 266/
#
$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
$SCRATCH_MNT/mysnap2 > /dev/null
$BTRFS_UTIL_PROG send -p $SCRATCH_MNT/mysnap1 -f $send_files_dir/2.snap \
$SCRATCH_MNT/mysnap2 2>&1 1>/dev/null | _filter_scratch
$FSSUM_PROG -A -f -w $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
$FSSUM_PROG -A -f -w $send_files_dir/2.fssum \
-x $SCRATCH_MNT/mysnap2/mysnap1 $SCRATCH_MNT/mysnap2
# Now recreate the filesystem by receiving both send streams and verify we get
# the same content that the original filesystem had.
_scratch_unmount
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
$BTRFS_UTIL_PROG receive -f $send_files_dir/1.snap $SCRATCH_MNT > /dev/null
$BTRFS_UTIL_PROG receive -f $send_files_dir/2.snap $SCRATCH_MNT > /dev/null
$FSSUM_PROG -r $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
$FSSUM_PROG -r $send_files_dir/2.fssum $SCRATCH_MNT/mysnap2
status=0
exit
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