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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/108
#
# Test that a send operation works correctly with reflinked files (cloned
# extents which multiple files point to).
#
. ./common/preamble
_begin_fstest auto quick send clone punch
# Override the default cleanup function.
_cleanup()
{
cd /
rm -fr $send_files_dir
rm -f $tmp.*
}
. ./common/filter
. ./common/reflink
_supported_fs btrfs
_require_scratch
_require_cp_reflink
_require_xfs_io_command "fpunch"
send_files_dir=$TEST_DIR/btrfs-test-$seq
rm -fr $send_files_dir
mkdir $send_files_dir
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
# Create our test file with a single 100K extent.
$XFS_IO_PROG -f -c "pwrite -S 0xaa 0K 100K" $SCRATCH_MNT/foo | _filter_xfs_io
# Clone our file into a new file named bar.
cp --reflink=always $SCRATCH_MNT/foo $SCRATCH_MNT/bar
# Now overwrite parts of our foo file.
$XFS_IO_PROG -c "pwrite -S 0xbb 50K 10K" \
-c "pwrite -S 0xcc 90K 10K" \
-c "fpunch 70K 10k" \
$SCRATCH_MNT/foo | _filter_xfs_io
_btrfs subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap
echo "File digests in the original filesystem:"
md5sum $SCRATCH_MNT/snap/foo | _filter_scratch
md5sum $SCRATCH_MNT/snap/bar | _filter_scratch
_btrfs send -f $send_files_dir/1.snap $SCRATCH_MNT/snap
# Now recreate the filesystem by receiving the send stream and verify we get
# the same file contents that the original filesystem had.
_scratch_unmount
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
_btrfs receive -f $send_files_dir/1.snap $SCRATCH_MNT
# We expect the destination filesystem to have exactly the same file data as
# the original filesystem.
# The btrfs send implementation had a bug where it sent a clone operation from
# file foo into file bar covering the whole [0, 100K[ range after creating
# and writing the file foo. This was incorrect because the file bar now included
# the updates done to file foo after we cloned foo to bar, breaking the COW
# nature of reflink copies (cloned extents).
echo "File digests in the new filesystem:"
md5sum $SCRATCH_MNT/snap/foo | _filter_scratch
md5sum $SCRATCH_MNT/snap/bar | _filter_scratch
status=0
exit
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