#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2014 Filipe Manana.  All Rights Reserved.
#
# FS QA Test No. btrfs/030
#
# Regression test for btrfs' incremental send feature:
#
# 1) Create several nested directories;
# 2) Create a read only snapshot;
# 3) Change the parentship of some of the deepest directories in a reverse
#    way, so that parents become children and children become parents;
# 4) Create another read only snapshot and use it for an incremental send
#    relative to the first snapshot.
#
# At step 4 btrfs' send entered an infinite loop, increasing the memory it
# used while building path strings until a krealloc was unable to allocate
# more memory, which caused a warning dump in dmesg.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

tmp=`mktemp -d`
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
    rm -fr $tmp
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# real QA test starts here
_supported_fs btrfs
_supported_os Linux
_require_scratch
_require_fssum

rm -f $seqres.full

_scratch_mkfs >/dev/null 2>&1
_scratch_mount


mkdir -p $SCRATCH_MNT/a/b/c
echo "hello" > $SCRATCH_MNT/a/b/c/file.txt
mkdir $SCRATCH_MNT/a/b/c/d
mkdir $SCRATCH_MNT/a/b/c2
mkdir $SCRATCH_MNT/a/b/www
echo "hey" > $SCRATCH_MNT/a/b/foobar.txt
mkdir -p $SCRATCH_MNT/a/b/c3/x/y

mkdir -p $SCRATCH_MNT/a/b/foo1/foo2
echo "hey" > $SCRATCH_MNT/a/b/foo1/foo2/f.txt
mkdir $SCRATCH_MNT/a/b/foo3

mkdir -p $SCRATCH_MNT/a/b/bar1/bar2/bar3/bar4
echo "ola" > $SCRATCH_MNT/a/b/bar1/bar2/bar3/bar4/hello.txt

# Directory tree looks like:
#
# .                                      (ino 256)
# |-- a/                                 (ino 257)
#     |-- b/                             (ino 258)
#         |-- c/                         (ino 259)
#         |   |-- file.txt               (ino 260)
#         |   |-- d/                     (ino 261)
#         |
#         |-- c2/                        (ino 262)
#         |-- www/                       (ino 263)
#         |-- foobar.txt                 (ino 264)
#         |
#         |-- c3/                        (ino 265)
#         |   |-- x/                     (ino 266)
#         |       |-- y/                 (ino 267)
#         |
#         |-- foo1/                      (ino 268)
#         |    |---foo2/                 (ino 269)
#         |         |---f.txt            (ino 270)
#         |
#         |-- foo3/                      (ino 271)
#         |
#         |-- bar1/                      (ino 272)
#              |-- bar2/                 (ino 273)
#                  |-- bar3/             (ino 274)
#                      |-- bar4          (ino 275)
#                           |--hello.txt (ino 276)

_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1

echo " world" >> $SCRATCH_MNT/a/b/c/file.txt
mv $SCRATCH_MNT/a/b/c/d $SCRATCH_MNT/a/b/c2/d2
mv $SCRATCH_MNT/a/b/c $SCRATCH_MNT/a/b/c2/d2/cc
mv $SCRATCH_MNT/a/b/c3/x/y $SCRATCH_MNT/a/b/c2/y2
mv $SCRATCH_MNT/a/b/c3/x $SCRATCH_MNT/a/b/c2/y2/x2
mv $SCRATCH_MNT/a/b/c3 $SCRATCH_MNT/a/b/c2/y2/x2/Z
mv $SCRATCH_MNT/a/b/www $SCRATCH_MNT/a/b/c2/y2/x2/WWW
mv $SCRATCH_MNT/a/b/foobar.txt $SCRATCH_MNT/a/b/c2/y2/x2/qwerty.txt
ln $SCRATCH_MNT/a/b/c2/d2/cc/file.txt $SCRATCH_MNT/a/b/c2/y2/x2/Z/file_link.txt
mv $SCRATCH_MNT/a/b/c2/d2/cc/file.txt $SCRATCH_MNT/a/b/c2/y2/x2

mv $SCRATCH_MNT/a/b/foo3 $SCRATCH_MNT/a/b/foo1/foo33
mv $SCRATCH_MNT/a/b/foo1/foo2 $SCRATCH_MNT/a/b/foo1/foo33/foo22
mv $SCRATCH_MNT/a/b/foo1/foo33/foo22/f.txt \
    $SCRATCH_MNT/a/b/foo1/foo33/foo22/fff.txt

echo " hello" >> $SCRATCH_MNT/a/b/bar1/bar2/bar3/bar4/hello.txt
mv $SCRATCH_MNT/a/b/bar1/bar2/bar3/bar4/hello.txt \
    $SCRATCH_MNT/a/b/bar1/bar2/bar3/bar4/hello2.txt
mv $SCRATCH_MNT/a/b/bar1/bar2/bar3/bar4 $SCRATCH_MNT/a/b/k44
mv $SCRATCH_MNT/a/b/bar1/bar2/bar3 $SCRATCH_MNT/a/b/k44
mv $SCRATCH_MNT/a/b/bar1/bar2 $SCRATCH_MNT/a/b/k44/bar3
mv $SCRATCH_MNT/a/b/bar1 $SCRATCH_MNT/a/b/k44/bar3/bar2/k11

# Directory tree now looks like:
#
# .                                         (ino 256)
# |-- a/                                    (ino 257)
#     |-- b/                                (ino 258)
#         |-- c2/                           (ino 262)
#         |   |-- d2/                       (ino 261)
#         |   |   |-- cc/                   (ino 259)
#         |   |
#         |   |-- y2/                       (ino 267)
#         |       |-- x2/                   (ino 266)
#         |           |-- file.txt          (ino 260)
#         |           |-- qwerty.txt        (ino 264)
#         |           |-- WWW/              (ino 263)
#         |           |-- Z/                (ino 265)
#         |               |-- file_link.txt
#         |
#         |-- foo1/                         (ino 268)
#         |    |---foo33/                   (ino 271)
#         |          |---foo22/             (ino 269)
#         |                |---fff.txt      (ino 270)
#         |
#         |-- k44/                          (ino 275)
#              |-- hello2.txt               (ino 276)
#              |-- bar3/                    (ino 274)
#                   |-- bar2/               (ino 273)
#                        |-- k11/           (ino 272)

_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap2

run_check $FSSUM_PROG -A -f -w $tmp/1.fssum $SCRATCH_MNT/mysnap1
run_check $FSSUM_PROG -A -f -w $tmp/2.fssum -x $SCRATCH_MNT/mysnap2/mysnap1 \
    $SCRATCH_MNT/mysnap2

_run_btrfs_util_prog send -f $tmp/1.snap $SCRATCH_MNT/mysnap1
_run_btrfs_util_prog send -f $tmp/2.snap -p $SCRATCH_MNT/mysnap1 \
    $SCRATCH_MNT/mysnap2

_scratch_unmount
_check_btrfs_filesystem $SCRATCH_DEV
_scratch_mkfs >/dev/null 2>&1
_scratch_mount

_run_btrfs_util_prog receive -f $tmp/1.snap $SCRATCH_MNT
run_check $FSSUM_PROG -r $tmp/1.fssum $SCRATCH_MNT/mysnap1 2>> $seqres.full

_run_btrfs_util_prog receive -f $tmp/2.snap $SCRATCH_MNT
run_check $FSSUM_PROG -r $tmp/2.fssum $SCRATCH_MNT/mysnap2 2>> $seqres.full

_scratch_unmount
_check_btrfs_filesystem $SCRATCH_DEV

status=0
exit