common/reflink - pub/scm/linux/kernel/git/dgc/xfstests-dev - Git at Google

 ##/bin/bash
 # SPDX-License-Identifier: GPL-2.0+
 # Copyright (c) 2015 Oracle.  All Rights Reserved.
 #
 # Routines for reflinking, deduping, and comparing parts of files.

 # Check that cp has a reflink argument
 _require_cp_reflink()
 {
        cp --help | grep -q reflink || \
                _notrun "This test requires a cp with --reflink support."
 }

 # Can we reflink between arbitrary file sets?
 # i.e. if we reflink a->b and c->d, can we later share
 # blocks between b & c?
 _require_arbitrary_fileset_reflink()
 {
 	test "$FSTYP" = "ocfs2" && \
 		_notrun "reflink between arbitrary file groups not supported in $FSTYP"
 }

 # Given 2 files, verify that they have the same mapping but different
 # inodes - i.e. an undisturbed reflink
 # Silent if so, make noise if not
 _verify_reflink()
 {
        # not a hard link or symlink?
        cmp -s  <(stat -c '%i' $1) <(stat -c '%i' $2) \
                && echo "$1 and $2 are not reflinks: same inode number"

        # same mapping?
        diff -u <($XFS_IO_PROG -c "fiemap" $1 | grep -v $1) \
                <($XFS_IO_PROG -c "fiemap" $2 | grep -v $2) \
                || echo "$1 and $2 are not reflinks: different extents"
 }

 # New reflink/dedupe helpers

 # this test requires the test fs support reflink...
 _require_test_reflink()
 {
 	_require_test
 	_require_xfs_io_command "reflink"

 	rm -rf "$TEST_DIR/file1" "$TEST_DIR/file2"
 	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$TEST_DIR/file1" > /dev/null
 	$XFS_IO_PROG -f -c "reflink $TEST_DIR/file1 0 0 65536" "$TEST_DIR/file2" > /dev/null
 	if [ ! -s "$TEST_DIR/file2" ]; then
 		rm -rf "$TEST_DIR/file1" "$TEST_DIR/file2"
 		_notrun "Reflink not supported by test filesystem type: $FSTYP"
 	fi
 	rm -rf "$TEST_DIR/file1" "$TEST_DIR/file2"
 }

 # this test requires the scratch fs support reflink...
 _require_scratch_reflink()
 {
 	_require_scratch
 	_require_xfs_io_command "reflink"

 	_scratch_mkfs > /dev/null
 	_scratch_mount
 	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$SCRATCH_MNT/file1" > /dev/null
 	$XFS_IO_PROG -f -c "reflink $SCRATCH_MNT/file1 0 0 65536" "$SCRATCH_MNT/file2" > /dev/null
 	if [ ! -s "$SCRATCH_MNT/file2" ]; then
 		_scratch_unmount
 		_notrun "Reflink not supported by scratch filesystem type: $FSTYP"
 	fi
 	_scratch_unmount
 }

 # this test requires scratch fs to report explicit SHARED flag
 # e.g.
 #   0         4K         8K
 #    / File1: Extent 0  \
 #   /                    \
 #   |<- On disk Extent-->|
 #   |        /
 #   | File2 /
 #     Extent: 0
 # Fs supports explicit SHARED extent reporting should report fiemap like:
 # File1: 2 extents
 # Extent 0-4K: SHARED
 # Extent 4-8K:
 # File2: 1 extents
 # Extent 0-4K: SHARED
 #
 # Fs doesn't support explicit reporting will report fiemap like:
 # File1: 1 extent
 # Extent 0-8K: SHARED
 # File2: 1 extent
 # Extent 0-4K: SHARED
 _require_scratch_explicit_shared_extents()
 {
 	_require_scratch
 	_require_xfs_io_command "fiemap"
 	_require_scratch_reflink
 	_require_xfs_io_command "reflink"
 	local nr_extents

 	_scratch_mkfs > /dev/null
 	_scratch_mount

 	_pwrite_byte 0x61 0 128k $SCRATCH_MNT/file1 >/dev/null
 	_reflink_range $SCRATCH_MNT/file1 0 $SCRATCH_MNT/file2 0 64k >/dev/null

 	_scratch_cycle_mount

 	nr_extents=$(_count_extents $SCRATCH_MNT/file1)
 	if [ $nr_extents -eq 1 ]; then
 		_notrun "Explicit SHARED flag reporting not support by filesystem type: $FSTYP"
 	fi
 	_scratch_unmount
 }

 # this test requires the test fs support dedupe...
 _require_test_dedupe()
 {
 	_require_test
 	_require_xfs_io_command "dedupe"

 	rm -rf "$TEST_DIR/file1" "$TEST_DIR/file2"
 	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$TEST_DIR/file1" > /dev/null
 	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$TEST_DIR/file2" > /dev/null
 	testio="$($XFS_IO_PROG -f -c "dedupe $TEST_DIR/file1 0 0 65536" "$TEST_DIR/file2" 2>&1)"
 	echo $testio | grep -q "Operation not supported" && \
 		_notrun "Dedupe not supported by test filesystem type: $FSTYP"
 	echo $testio | grep -q "Inappropriate ioctl for device" && \
 		_notrun "Dedupe not supported by test filesystem type: $FSTYP"
 	echo $testio | grep -q "Invalid argument" && \
 		_notrun "Dedupe not supported by test filesystem type: $FSTYP"
 	rm -rf "$TEST_DIR/file1" "$TEST_DIR/file2"
 }

 # this test requires the scratch fs support dedupe...
 _require_scratch_dedupe()
 {
 	_require_scratch
 	_require_xfs_io_command "dedupe"

 	_scratch_mkfs > /dev/null
 	_scratch_mount
 	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$SCRATCH_MNT/file1" > /dev/null
 	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$SCRATCH_MNT/file2" > /dev/null
 	testio="$($XFS_IO_PROG -f -c "dedupe $SCRATCH_MNT/file1 0 0 65536" "$SCRATCH_MNT/file2" 2>&1)"
 	echo $testio | grep -q "Operation not supported" && \
 		_notrun "Dedupe not supported by test filesystem type: $FSTYP"
 	echo $testio | grep -q "Inappropriate ioctl for device" && \
 		_notrun "Dedupe not supported by test filesystem type: $FSTYP"
 	echo $testio | grep -q "Invalid argument" && \
 		_notrun "Dedupe not supported by test filesystem type: $FSTYP"
 	_scratch_unmount
 }

 # Prints a range of a file as a hex dump
 _read_range() {
 	file="$1"
 	offset="$2"
 	len="$3"
 	xfs_io_args="$4"

 	$XFS_IO_PROG $xfs_io_args -f -c "pread -q -v $offset $len" "$file" | cut -d ' ' -f '3-18'
 }

 # Compare ranges of two files
 _compare_range() {
 	file1="$1"
 	offset1="$2"
 	file2="$3"
 	offset2="$4"
 	len="$5"

 	cmp -s <(_read_range "$file1" "$offset1" "$len") \
 	       <(_read_range "$file2" "$offset2" "$len")
 }

 # Prints the md5 checksum of a hexdump of a part of a given file
 _md5_range_checksum() {
 	file="$1"
 	offset="$2"
 	len="$3"

 	md5sum <(_read_range "$file" "$offset" "$len") | cut -d ' ' -f 1
 }

 # Reflink some file1 into file2 via cp
 _cp_reflink() {
 	file1="$1"
 	file2="$2"

 	cp --reflink=always -p -f "$file1" "$file2"
 }

 # Reflink some file1 into file2
 _reflink() {
 	file1="$1"
 	file2="$2"

 	$XFS_IO_PROG -f -c "reflink $file1" "$file2"
 }

 # Reflink some part of file1 into another part of file2
 _reflink_range() {
 	file1="$1"
 	offset1="$2"
 	file2="$3"
 	offset2="$4"
 	len="$5"
 	xfs_io_args="$6"

 	$XFS_IO_PROG $xfs_io_args -f -c "reflink $file1 $offset1 $offset2 $len" "$file2"
 }

 # Dedupe some part of file1 into another part of file2
 _dedupe_range() {
 	file1="$1"
 	offset1="$2"
 	file2="$3"
 	offset2="$4"
 	len="$5"
 	xfs_io_args="$6"

 	$XFS_IO_PROG $xfs_io_args -f -c "dedupe $file1 $offset1 $offset2 $len" "$file2"
 }

 # Unify xfs_io dedupe ioctl error message prefix
 _filter_dedupe_error()
 {
 	sed -e 's/^dedupe:/XFS_IOC_FILE_EXTENT_SAME:/g'
 }

 # Create a file of interleaved unwritten and reflinked blocks
 _weave_reflink_unwritten() {
 	blksz=$1
 	nr=$2
 	sfile=$3
 	dfile=$4

 	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile
 	$XFS_IO_PROG -f -c "falloc 0 $((blksz * nr))" $dfile
 	_pwrite_byte 0x00 0 $((blksz * nr)) $dfile.chk
 	seq 0 2 $((nr - 1)) | while read i; do
 		_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
 		_pwrite_byte 0x61 $((blksz * i)) $blksz $dfile.chk
 	done
 }

 # Create a file of interleaved holes and reflinked blocks
 _weave_reflink_holes() {
 	blksz=$1
 	nr=$2
 	sfile=$3
 	dfile=$4

 	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile
 	$XFS_IO_PROG -f -c "truncate $((blksz * nr))" $dfile
 	_pwrite_byte 0x00 0 $((blksz * nr)) $dfile.chk
 	seq 0 2 $((nr - 1)) | while read i; do
 		_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
 		_pwrite_byte 0x61 $((blksz * i)) $blksz $dfile.chk
 	done
 }

 # For a file created with _weave_reflink_holes, fill the holes with delalloc
 # extents
 _weave_reflink_holes_delalloc() {
 	blksz=$1
 	nr=$2
 	dfile=$3

 	seq 1 2 $((nr - 1)) | while read i; do
 		_pwrite_byte 0x62 $((blksz * i)) $blksz $dfile
 		_pwrite_byte 0x62 $((blksz * i)) $blksz $dfile.chk
 	done
 }

 # Create a file of interleaved regular blocks and reflinked blocks
 _weave_reflink_regular() {
 	blksz=$1
 	nr=$2
 	sfile=$3
 	dfile=$4

 	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile
 	_pwrite_byte 0x62 0 $((blksz * nr)) $dfile
 	_pwrite_byte 0x62 0 $((blksz * nr)) $dfile.chk
 	seq 0 2 $((nr - 1)) | while read i; do
 		_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
 		_pwrite_byte 0x61 $((blksz * i)) $blksz $dfile.chk
 	done
 }

 # Create a file of interleaved holes, unwritten blocks, regular blocks, and
 # reflinked blocks
 _weave_reflink_rainbow() {
 	blksz=$1
 	nr=$2
 	sfile=$3
 	dfile=$4

 	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile
 	$XFS_IO_PROG -f -c "truncate $((blksz * nr))" $dfile
 	_pwrite_byte 0x00 0 $((blksz * nr)) $dfile.chk
 	# 0 blocks are reflinked
 	seq 0 5 $((nr - 1)) | while read i; do
 		_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
 		_pwrite_byte 0x61 $((blksz * i)) $blksz $dfile.chk
 	done
 	# 1 blocks are unwritten
 	seq 1 5 $((nr - 1)) | while read i; do
 		$XFS_IO_PROG -f -c "falloc $((blksz * i)) $blksz" $dfile
 		_pwrite_byte 0x00 $((blksz * i)) $blksz $dfile.chk
 	done
 	# 2 blocks are holes
 	seq 2 5 $((nr - 1)) | while read i; do
 		_pwrite_byte 0x00 $((blksz * i)) $blksz $dfile.chk
 	done
 	# 3 blocks are regular
 	seq 3 5 $((nr - 1)) | while read i; do
 		_pwrite_byte 0x71 $((blksz * i)) $blksz $dfile
 		_pwrite_byte 0x71 $((blksz * i)) $blksz $dfile.chk
 	done
 	# 4 blocks will be delalloc later
 }

 # For a file created with _weave_reflink_rainbow, fill the holes with delalloc
 # extents
 _weave_reflink_rainbow_delalloc() {
 	blksz=$1
 	nr=$2
 	dfile=$3

 	# 4 blocks are delalloc (do later)
 	seq 4 5 $((nr - 1)) | while read i; do
 		_pwrite_byte 0x62 $((blksz * i)) $blksz $dfile
 		_pwrite_byte 0x62 $((blksz * i)) $blksz $dfile.chk
 	done
 }

 # Make the source file have interleaved regular blocks and reflinked blocks
 _sweave_reflink_regular() {
 	blksz=$1
 	nr=$2
 	sfile=$3
 	dfile=$4

 	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile
 	_pwrite_byte 0x62 0 $((blksz * nr)) $dfile
 	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile.chk
 	seq 1 2 $((nr - 1)) | while read i; do
 		_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
 	done
 }

 # Make the source file have interleaved unwritten blocks and reflinked blocks
 _sweave_reflink_unwritten() {
 	blksz=$1
 	nr=$2
 	sfile=$3
 	dfile=$4

 	$XFS_IO_PROG -f -c "falloc 0 $((blksz * nr))" $sfile
 	_pwrite_byte 0x00 0 $((blksz * nr)) $sfile.chk
 	_pwrite_byte 0x62 0 $((blksz * nr)) $dfile
 	seq 1 2 $((nr - 1)) | while read i; do
 		_pwrite_byte 0x61 $((blksz * i)) $blksz $sfile
 		_pwrite_byte 0x61 $((blksz * i)) $blksz $sfile.chk
 	done
 	seq 1 2 $((nr - 1)) | while read i; do
 		_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
 	done
 }

 # Make the source file have interleaved holes and reflinked blocks
 _sweave_reflink_holes() {
 	blksz=$1
 	nr=$2
 	sfile=$3
 	dfile=$4

 	$XFS_IO_PROG -f -c "truncate $((blksz * nr))" $sfile
 	_pwrite_byte 0x00 0 $((blksz * nr)) $sfile.chk
 	_pwrite_byte 0x62 0 $((blksz * nr)) $dfile
 	seq 1 2 $((nr - 1)) | while read i; do
 		_pwrite_byte 0x61 $((blksz * i)) $blksz $sfile
 		_pwrite_byte 0x61 $((blksz * i)) $blksz $sfile.chk
 	done
 	seq 1 2 $((nr - 1)) | while read i; do
 		_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
 	done
 }

 # For a file created with _sweave_reflink_holes, fill the holes with delalloc
 # extents
 _sweave_reflink_holes_delalloc() {
 	blksz=$1
 	nr=$2
 	sfile=$3

 	seq 0 2 $((nr - 1)) | while read i; do
 		_pwrite_byte 0x64 $((blksz * i)) $blksz $sfile
 		_pwrite_byte 0x64 $((blksz * i)) $blksz $sfile.chk
 	done
 }
	##/bin/bash
	# SPDX-License-Identifier: GPL-2.0+
	# Copyright (c) 2015 Oracle. All Rights Reserved.
	#
	# Routines for reflinking, deduping, and comparing parts of files.

	# Check that cp has a reflink argument
	_require_cp_reflink()
	{
	cp --help \| grep -q reflink \|\| \
	_notrun "This test requires a cp with --reflink support."
	}

	# Can we reflink between arbitrary file sets?
	# i.e. if we reflink a->b and c->d, can we later share
	# blocks between b & c?
	_require_arbitrary_fileset_reflink()
	{
	test "$FSTYP" = "ocfs2" && \
	_notrun "reflink between arbitrary file groups not supported in $FSTYP"
	}

	# Given 2 files, verify that they have the same mapping but different
	# inodes - i.e. an undisturbed reflink
	# Silent if so, make noise if not
	_verify_reflink()
	{
	# not a hard link or symlink?
	cmp -s <(stat -c '%i' $1) <(stat -c '%i' $2) \
	&& echo "$1 and $2 are not reflinks: same inode number"

	# same mapping?
	diff -u <($XFS_IO_PROG -c "fiemap" $1 \| grep -v $1) \
	<($XFS_IO_PROG -c "fiemap" $2 \| grep -v $2) \
	\|\| echo "$1 and $2 are not reflinks: different extents"
	}

	# New reflink/dedupe helpers

	# this test requires the test fs support reflink...
	_require_test_reflink()
	{
	_require_test
	_require_xfs_io_command "reflink"

	rm -rf "$TEST_DIR/file1" "$TEST_DIR/file2"
	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$TEST_DIR/file1" > /dev/null
	$XFS_IO_PROG -f -c "reflink $TEST_DIR/file1 0 0 65536" "$TEST_DIR/file2" > /dev/null
	if [ ! -s "$TEST_DIR/file2" ]; then
	rm -rf "$TEST_DIR/file1" "$TEST_DIR/file2"
	_notrun "Reflink not supported by test filesystem type: $FSTYP"
	fi
	rm -rf "$TEST_DIR/file1" "$TEST_DIR/file2"
	}

	# this test requires the scratch fs support reflink...
	_require_scratch_reflink()
	{
	_require_scratch
	_require_xfs_io_command "reflink"

	_scratch_mkfs > /dev/null
	_scratch_mount
	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$SCRATCH_MNT/file1" > /dev/null
	$XFS_IO_PROG -f -c "reflink $SCRATCH_MNT/file1 0 0 65536" "$SCRATCH_MNT/file2" > /dev/null
	if [ ! -s "$SCRATCH_MNT/file2" ]; then
	_scratch_unmount
	_notrun "Reflink not supported by scratch filesystem type: $FSTYP"
	fi
	_scratch_unmount
	}

	# this test requires scratch fs to report explicit SHARED flag
	# e.g.
	# 0 4K 8K
	# / File1: Extent 0 \
	# / \
	# \|<- On disk Extent-->\|
	# \| /
	# \| File2 /
	# Extent: 0
	# Fs supports explicit SHARED extent reporting should report fiemap like:
	# File1: 2 extents
	# Extent 0-4K: SHARED
	# Extent 4-8K:
	# File2: 1 extents
	# Extent 0-4K: SHARED
	#
	# Fs doesn't support explicit reporting will report fiemap like:
	# File1: 1 extent
	# Extent 0-8K: SHARED
	# File2: 1 extent
	# Extent 0-4K: SHARED
	_require_scratch_explicit_shared_extents()
	{
	_require_scratch
	_require_xfs_io_command "fiemap"
	_require_scratch_reflink
	_require_xfs_io_command "reflink"
	local nr_extents

	_scratch_mkfs > /dev/null
	_scratch_mount

	_pwrite_byte 0x61 0 128k $SCRATCH_MNT/file1 >/dev/null
	_reflink_range $SCRATCH_MNT/file1 0 $SCRATCH_MNT/file2 0 64k >/dev/null

	_scratch_cycle_mount

	nr_extents=$(_count_extents $SCRATCH_MNT/file1)
	if [ $nr_extents -eq 1 ]; then
	_notrun "Explicit SHARED flag reporting not support by filesystem type: $FSTYP"
	fi
	_scratch_unmount
	}

	# this test requires the test fs support dedupe...
	_require_test_dedupe()
	{
	_require_test
	_require_xfs_io_command "dedupe"

	rm -rf "$TEST_DIR/file1" "$TEST_DIR/file2"
	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$TEST_DIR/file1" > /dev/null
	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$TEST_DIR/file2" > /dev/null
	testio="$($XFS_IO_PROG -f -c "dedupe $TEST_DIR/file1 0 0 65536" "$TEST_DIR/file2" 2>&1)"
	echo $testio \| grep -q "Operation not supported" && \
	_notrun "Dedupe not supported by test filesystem type: $FSTYP"
	echo $testio \| grep -q "Inappropriate ioctl for device" && \
	_notrun "Dedupe not supported by test filesystem type: $FSTYP"
	echo $testio \| grep -q "Invalid argument" && \
	_notrun "Dedupe not supported by test filesystem type: $FSTYP"
	rm -rf "$TEST_DIR/file1" "$TEST_DIR/file2"
	}

	# this test requires the scratch fs support dedupe...
	_require_scratch_dedupe()
	{
	_require_scratch
	_require_xfs_io_command "dedupe"

	_scratch_mkfs > /dev/null
	_scratch_mount
	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$SCRATCH_MNT/file1" > /dev/null
	$XFS_IO_PROG -f -c "pwrite -S 0x61 0 65536" "$SCRATCH_MNT/file2" > /dev/null
	testio="$($XFS_IO_PROG -f -c "dedupe $SCRATCH_MNT/file1 0 0 65536" "$SCRATCH_MNT/file2" 2>&1)"
	echo $testio \| grep -q "Operation not supported" && \
	_notrun "Dedupe not supported by test filesystem type: $FSTYP"
	echo $testio \| grep -q "Inappropriate ioctl for device" && \
	_notrun "Dedupe not supported by test filesystem type: $FSTYP"
	echo $testio \| grep -q "Invalid argument" && \
	_notrun "Dedupe not supported by test filesystem type: $FSTYP"
	_scratch_unmount
	}

	# Prints a range of a file as a hex dump
	_read_range() {
	file="$1"
	offset="$2"
	len="$3"
	xfs_io_args="$4"

	$XFS_IO_PROG $xfs_io_args -f -c "pread -q -v $offset $len" "$file" \| cut -d ' ' -f '3-18'
	}

	# Compare ranges of two files
	_compare_range() {
	file1="$1"
	offset1="$2"
	file2="$3"
	offset2="$4"
	len="$5"

	cmp -s <(_read_range "$file1" "$offset1" "$len") \
	<(_read_range "$file2" "$offset2" "$len")
	}

	# Prints the md5 checksum of a hexdump of a part of a given file
	_md5_range_checksum() {
	file="$1"
	offset="$2"
	len="$3"

	md5sum <(_read_range "$file" "$offset" "$len") \| cut -d ' ' -f 1
	}

	# Reflink some file1 into file2 via cp
	_cp_reflink() {
	file1="$1"
	file2="$2"

	cp --reflink=always -p -f "$file1" "$file2"
	}

	# Reflink some file1 into file2
	_reflink() {
	file1="$1"
	file2="$2"

	$XFS_IO_PROG -f -c "reflink $file1" "$file2"
	}

	# Reflink some part of file1 into another part of file2
	_reflink_range() {
	file1="$1"
	offset1="$2"
	file2="$3"
	offset2="$4"
	len="$5"
	xfs_io_args="$6"

	$XFS_IO_PROG $xfs_io_args -f -c "reflink $file1 $offset1 $offset2 $len" "$file2"
	}

	# Dedupe some part of file1 into another part of file2
	_dedupe_range() {
	file1="$1"
	offset1="$2"
	file2="$3"
	offset2="$4"
	len="$5"
	xfs_io_args="$6"

	$XFS_IO_PROG $xfs_io_args -f -c "dedupe $file1 $offset1 $offset2 $len" "$file2"
	}

	# Unify xfs_io dedupe ioctl error message prefix
	_filter_dedupe_error()
	{
	sed -e 's/^dedupe:/XFS_IOC_FILE_EXTENT_SAME:/g'
	}

	# Create a file of interleaved unwritten and reflinked blocks
	_weave_reflink_unwritten() {
	blksz=$1
	nr=$2
	sfile=$3
	dfile=$4

	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile
	$XFS_IO_PROG -f -c "falloc 0 $((blksz * nr))" $dfile
	_pwrite_byte 0x00 0 $((blksz * nr)) $dfile.chk
	seq 0 2 $((nr - 1)) \| while read i; do
	_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
	_pwrite_byte 0x61 $((blksz * i)) $blksz $dfile.chk
	done
	}

	# Create a file of interleaved holes and reflinked blocks
	_weave_reflink_holes() {
	blksz=$1
	nr=$2
	sfile=$3
	dfile=$4

	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile
	$XFS_IO_PROG -f -c "truncate $((blksz * nr))" $dfile
	_pwrite_byte 0x00 0 $((blksz * nr)) $dfile.chk
	seq 0 2 $((nr - 1)) \| while read i; do
	_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
	_pwrite_byte 0x61 $((blksz * i)) $blksz $dfile.chk
	done
	}

	# For a file created with _weave_reflink_holes, fill the holes with delalloc
	# extents
	_weave_reflink_holes_delalloc() {
	blksz=$1
	nr=$2
	dfile=$3

	seq 1 2 $((nr - 1)) \| while read i; do
	_pwrite_byte 0x62 $((blksz * i)) $blksz $dfile
	_pwrite_byte 0x62 $((blksz * i)) $blksz $dfile.chk
	done
	}

	# Create a file of interleaved regular blocks and reflinked blocks
	_weave_reflink_regular() {
	blksz=$1
	nr=$2
	sfile=$3
	dfile=$4

	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile
	_pwrite_byte 0x62 0 $((blksz * nr)) $dfile
	_pwrite_byte 0x62 0 $((blksz * nr)) $dfile.chk
	seq 0 2 $((nr - 1)) \| while read i; do
	_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
	_pwrite_byte 0x61 $((blksz * i)) $blksz $dfile.chk
	done
	}

	# Create a file of interleaved holes, unwritten blocks, regular blocks, and
	# reflinked blocks
	_weave_reflink_rainbow() {
	blksz=$1
	nr=$2
	sfile=$3
	dfile=$4

	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile
	$XFS_IO_PROG -f -c "truncate $((blksz * nr))" $dfile
	_pwrite_byte 0x00 0 $((blksz * nr)) $dfile.chk
	# 0 blocks are reflinked
	seq 0 5 $((nr - 1)) \| while read i; do
	_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
	_pwrite_byte 0x61 $((blksz * i)) $blksz $dfile.chk
	done
	# 1 blocks are unwritten
	seq 1 5 $((nr - 1)) \| while read i; do
	$XFS_IO_PROG -f -c "falloc $((blksz * i)) $blksz" $dfile
	_pwrite_byte 0x00 $((blksz * i)) $blksz $dfile.chk
	done
	# 2 blocks are holes
	seq 2 5 $((nr - 1)) \| while read i; do
	_pwrite_byte 0x00 $((blksz * i)) $blksz $dfile.chk
	done
	# 3 blocks are regular
	seq 3 5 $((nr - 1)) \| while read i; do
	_pwrite_byte 0x71 $((blksz * i)) $blksz $dfile
	_pwrite_byte 0x71 $((blksz * i)) $blksz $dfile.chk
	done
	# 4 blocks will be delalloc later
	}

	# For a file created with _weave_reflink_rainbow, fill the holes with delalloc
	# extents
	_weave_reflink_rainbow_delalloc() {
	blksz=$1
	nr=$2
	dfile=$3

	# 4 blocks are delalloc (do later)
	seq 4 5 $((nr - 1)) \| while read i; do
	_pwrite_byte 0x62 $((blksz * i)) $blksz $dfile
	_pwrite_byte 0x62 $((blksz * i)) $blksz $dfile.chk
	done
	}

	# Make the source file have interleaved regular blocks and reflinked blocks
	_sweave_reflink_regular() {
	blksz=$1
	nr=$2
	sfile=$3
	dfile=$4

	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile
	_pwrite_byte 0x62 0 $((blksz * nr)) $dfile
	_pwrite_byte 0x61 0 $((blksz * nr)) $sfile.chk
	seq 1 2 $((nr - 1)) \| while read i; do
	_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
	done
	}

	# Make the source file have interleaved unwritten blocks and reflinked blocks
	_sweave_reflink_unwritten() {
	blksz=$1
	nr=$2
	sfile=$3
	dfile=$4

	$XFS_IO_PROG -f -c "falloc 0 $((blksz * nr))" $sfile
	_pwrite_byte 0x00 0 $((blksz * nr)) $sfile.chk
	_pwrite_byte 0x62 0 $((blksz * nr)) $dfile
	seq 1 2 $((nr - 1)) \| while read i; do
	_pwrite_byte 0x61 $((blksz * i)) $blksz $sfile
	_pwrite_byte 0x61 $((blksz * i)) $blksz $sfile.chk
	done
	seq 1 2 $((nr - 1)) \| while read i; do
	_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
	done
	}

	# Make the source file have interleaved holes and reflinked blocks
	_sweave_reflink_holes() {
	blksz=$1
	nr=$2
	sfile=$3
	dfile=$4

	$XFS_IO_PROG -f -c "truncate $((blksz * nr))" $sfile
	_pwrite_byte 0x00 0 $((blksz * nr)) $sfile.chk
	_pwrite_byte 0x62 0 $((blksz * nr)) $dfile
	seq 1 2 $((nr - 1)) \| while read i; do
	_pwrite_byte 0x61 $((blksz * i)) $blksz $sfile
	_pwrite_byte 0x61 $((blksz * i)) $blksz $sfile.chk
	done
	seq 1 2 $((nr - 1)) \| while read i; do
	_reflink_range $sfile $((blksz * i)) $dfile $((blksz * i)) $blksz
	done
	}

	# For a file created with _sweave_reflink_holes, fill the holes with delalloc
	# extents
	_sweave_reflink_holes_delalloc() {
	blksz=$1
	nr=$2
	sfile=$3

	seq 0 2 $((nr - 1)) \| while read i; do
	_pwrite_byte 0x64 $((blksz * i)) $blksz $sfile
	_pwrite_byte 0x64 $((blksz * i)) $blksz $sfile.chk
	done
	}