tests/btrfs/319

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2024 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test 319
#
# Test that a send operation will issue a clone operation for a shared extent
# of a file if the extent ends at the i_size of the file and the i_size is not
# sector size aligned.
#
. ./common/preamble
_begin_fstest auto quick send clone fiemap

# Override the default cleanup function.
_cleanup()
{
	cd /
	rm -fr $tmp.*
	rm -fr $send_files_dir
}

. ./common/filter
. ./common/reflink
. ./common/punch # for _filter_fiemap_flags

_require_test
_require_scratch_reflink
_require_cp_reflink
_require_xfs_io_command "fiemap"
_require_odirect

_fixed_by_kernel_commit 46a6e10a1ab1 \
	"btrfs: send: allow cloning non-aligned extent if it ends at i_size"

check_all_extents_shared()
{
	local file=$1
	local fiemap_output

	fiemap_output=$($XFS_IO_PROG -r -c "fiemap -v" $file | _filter_fiemap_flags)
	echo "$fiemap_output" | grep -qv 'shared'
	if [ $? -eq 0 ]; then
		echo -e "Found non-shared extents for file $file:\n"
		echo "$fiemap_output"
	fi
}

send_files_dir=$TEST_DIR/btrfs-test-$seq
send_stream=$send_files_dir/snap.stream

rm -fr $send_files_dir
mkdir $send_files_dir

_scratch_mkfs >> $seqres.full 2>&1 || _fail "first mkfs failed"
_scratch_mount

# Use a file size that is not aligned to any possible sector size (1M + 5 bytes).
file_size=$((1024 * 1024 + 5))
# Use O_DIRECT to guarantee a single extent.
$XFS_IO_PROG -f -d -c "pwrite -S 0xab -b $file_size 0 $file_size" \
	     $SCRATCH_MNT/foo | _filter_xfs_io

# Clone the file.
_cp_reflink $SCRATCH_MNT/foo $SCRATCH_MNT/bar

echo "Creating snapshot and a send stream for it..."
_btrfs subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap
$BTRFS_UTIL_PROG send -f $send_stream $SCRATCH_MNT/snap >> $seqres.full 2>&1

echo "File digests in the original filesystem:"
md5sum $SCRATCH_MNT/snap/foo | _filter_scratch
md5sum $SCRATCH_MNT/snap/bar | _filter_scratch

check_all_extents_shared "$SCRATCH_MNT/snap/bar"

echo "Creating a new filesystem to receive the send stream..."
_scratch_unmount
_scratch_mkfs >> $seqres.full 2>&1 || _fail "second mkfs failed"
_scratch_mount

$BTRFS_UTIL_PROG receive -f $send_stream $SCRATCH_MNT

echo "File digests in the new filesystem:"
md5sum $SCRATCH_MNT/snap/foo | _filter_scratch
md5sum $SCRATCH_MNT/snap/bar | _filter_scratch

check_all_extents_shared "$SCRATCH_MNT/snap/bar"

# success, all done
status=0
exit