From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-btrfs-owner@vger.kernel.org>
Received: from mail-ie0-f179.google.com ([209.85.223.179]:32984 "EHLO
	mail-ie0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751278AbbCZK73 (ORCPT
	<rfc822;linux-btrfs@vger.kernel.org>);
	Thu, 26 Mar 2015 06:59:29 -0400
MIME-Version: 1.0
Reply-To: fdmanana@gmail.com
In-Reply-To: <1427360830-6209-1-git-send-email-chandan@linux.vnet.ibm.com>
References: <1427360830-6209-1-git-send-email-chandan@linux.vnet.ibm.com>
Date: Thu, 26 Mar 2015 10:59:28 +0000
Message-ID: <CAL3q7H5Nhzyii3PkYAas+Fe6iQWrunRh_XRa6D8Pazt9MwdoyQ@mail.gmail.com>
Subject: Re: [RFC PATCH] btrfs/052: Fix test case to work on variable block size.
From: Filipe David Manana <fdmanana@gmail.com>
To: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Cc: fstests@vger.kernel.org,
        "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>,
        chandan@mykolab.com
Content-Type: text/plain; charset=UTF-8
Sender: linux-btrfs-owner@vger.kernel.org
List-ID: <linux-btrfs.vger.kernel.org>

On Thu, Mar 26, 2015 at 9:07 AM, Chandan Rajendra
<chandan@linux.vnet.ibm.com> wrote:
> The test case passes file offsets which are aligned to 4k block size.  This
> causes btrfs_ioctl_clone() to return with -EINVAL for larger block sizes. Fix
> this by computing file offsets at run time based on the block size of the
> underlying filesystem.
>
> Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>



> ---
> There are some more test cases which assume 4k as the underlying
> filesystem's block size. I am planning to fix them using the
> final solution agreed upon by the community.

Seems fine to me. Only one minor comment below.
You should have mentioned that this patch supersedes your previous
patch https://patchwork.kernel.org/patch/5908801/

Thanks for doing this.


>
>  common/filter       |  37 ++++
>  tests/btrfs/052     | 125 +++++++-----
>  tests/btrfs/052.out | 546 +++++++++++++++++++++++-----------------------------
>  3 files changed, 358 insertions(+), 350 deletions(-)
>
> diff --git a/common/filter b/common/filter
> index 71ef2e2..750e165 100644
> --- a/common/filter
> +++ b/common/filter
> @@ -233,6 +233,30 @@ _filter_xfs_io_unique()
>      common_line_filter | _filter_xfs_io
>  }
>
> +_filter_xfs_io_blocks_modified()
> +{
> +       BLOCK_SIZE=$(get_block_size $SCRATCH_MNT)
> +
> +       $AWK_PROG -v block_size=$BLOCK_SIZE '
> +               /wrote/ {
> +                       split($2, bytes, "/")
> +
> +                       bytes_written = strtonum(bytes[1])
> +
> +                       offset = strtonum($NF)
> +
> +                       block_start = offset / block_size
> +                       block_start = int(block_start)
> +                       block_end = (offset + bytes_written - 1) / block_size
> +                       block_end = int(block_end)
> +
> +                       printf("Blocks modified: [%d - %d]\n", block_start, block_end)
> +
> +                       next
> +               }
> +       '
> +}
> +
>  _filter_test_dir()
>  {
>         sed -e "s,$TEST_DEV,TEST_DEV,g" -e "s,$TEST_DIR,TEST_DIR,g"
> @@ -327,5 +351,18 @@ _filter_ro_mount() {
>             -e "s/mount: cannot mount block device/mount: cannot mount/g"
>  }
>
> +_filter_od()
> +{
> +       BLOCK_SIZE=$(get_block_size $SCRATCH_MNT)
> +       $AWK_PROG -v block_size=$BLOCK_SIZE '
> +               /^[0-9]+/ {
> +                       offset = strtonum("0"$1);
> +                       $1 = sprintf("%o", offset / block_size);
> +                       print $0;
> +               }
> +               /\*/
> +       '
> +}
> +
>  # make sure this script returns success
>  /bin/true
> diff --git a/tests/btrfs/052 b/tests/btrfs/052
> index c75193d..8dd7243 100755
> --- a/tests/btrfs/052
> +++ b/tests/btrfs/052
> @@ -59,78 +59,103 @@ test_btrfs_clone_same_file()
>         _scratch_mkfs >/dev/null 2>&1
>         _scratch_mount $MOUNT_OPTIONS
>
> -       # Create a file with 5 extents, 4 of 8Kb each and 1 of 64Kb.
> -       $XFS_IO_PROG -f -c "pwrite -S 0x01 -b 8192 0 8192" $SCRATCH_MNT/foo \
> -               | _filter_xfs_io
> +       BLOCK_SIZE=$(get_block_size $SCRATCH_MNT)
> +
> +       EXTENT_SIZE=$((2 * $BLOCK_SIZE))
> +
> +       # Create a file with 5 extents, 4 of 2 blocks each and 1 of 16 blocks.
> +       OFFSET=0
> +       $XFS_IO_PROG -f -c "pwrite -S 0x01 -b $EXTENT_SIZE $OFFSET $EXTENT_SIZE" $SCRATCH_MNT/foo \
> +               | _filter_xfs_io_blocks_modified
>         sync
> -       $XFS_IO_PROG -c "pwrite -S 0x02 -b 8192 8192 8192" $SCRATCH_MNT/foo \
> -               | _filter_xfs_io
> +
> +       OFFSET=$(($OFFSET + $EXTENT_SIZE))
> +       $XFS_IO_PROG -c "pwrite -S 0x02 -b $EXTENT_SIZE $OFFSET $EXTENT_SIZE" $SCRATCH_MNT/foo \
> +               | _filter_xfs_io_blocks_modified
>         sync
> -       $XFS_IO_PROG -c "pwrite -S 0x03 -b 8192 16384 8192" $SCRATCH_MNT/foo \
> -               | _filter_xfs_io
> +
> +       OFFSET=$(($OFFSET + $EXTENT_SIZE))
> +       $XFS_IO_PROG -c "pwrite -S 0x03 -b $EXTENT_SIZE $OFFSET $EXTENT_SIZE" $SCRATCH_MNT/foo \
> +               | _filter_xfs_io_blocks_modified
>         sync
> -       $XFS_IO_PROG -c "pwrite -S 0x04 -b 8192 24576 8192" $SCRATCH_MNT/foo \
> -               | _filter_xfs_io
> +
> +       OFFSET=$(($OFFSET + $EXTENT_SIZE))
> +       $XFS_IO_PROG -c "pwrite -S 0x04 -b $EXTENT_SIZE $OFFSET $EXTENT_SIZE" $SCRATCH_MNT/foo \
> +               | _filter_xfs_io_blocks_modified
>         sync
> -       $XFS_IO_PROG -c "pwrite -S 0x05 -b 65536 32768 65536" $SCRATCH_MNT/foo \
> -               | _filter_xfs_io
> +
> +       OFFSET=$(($OFFSET + $EXTENT_SIZE))
> +       EXTENT_SIZE=$((16 * $BLOCK_SIZE))
> +       $XFS_IO_PROG -c "pwrite -S 0x05 -b $EXTENT_SIZE $OFFSET $EXTENT_SIZE" $SCRATCH_MNT/foo \
> +               | _filter_xfs_io_blocks_modified
>         sync
>
>         # Digest of initial content.
> -       md5sum $SCRATCH_MNT/foo | _filter_scratch
> +       orig_hash=$(md5sum $SCRATCH_MNT/foo | cut -f 1 -d ' ')
>
>         # Same source and target ranges - must fail.
> -       $CLONER_PROG -s 8192 -d 8192 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/foo
> +       $CLONER_PROG -s $((2 * $BLOCK_SIZE)) -d $((2 * $BLOCK_SIZE)) \
> +                    -l $((2 * $BLOCK_SIZE)) $SCRATCH_MNT/foo $SCRATCH_MNT/foo
>         # Check file content didn't change.
> -       md5sum $SCRATCH_MNT/foo | _filter_scratch
> +       hash=$(md5sum $SCRATCH_MNT/foo | cut -f 1 -d ' ')
> +       if [ $orig_hash != $hash ]; then
> +               echo "Mismatching hash values detected."
> +       fi

We could make this message different from the one below (with some
context information), so that if a regression happens one day it's
easier to figure out which case broke.

>
>         # Intersection between source and target ranges - must fail too.
> -       $CLONER_PROG -s 4096 -d 8192 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/foo
> +       # $CLONER_PROG -s 4096 -d 8192 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/foo
> +       $CLONER_PROG -s $((1 * $BLOCK_SIZE)) -d $((2 * $BLOCK_SIZE)) \
> +                    -l $((2 * $BLOCK_SIZE)) $SCRATCH_MNT/foo $SCRATCH_MNT/foo
>         # Check file content didn't change.
> -       md5sum $SCRATCH_MNT/foo | _filter_scratch
> +       hash=$(md5sum $SCRATCH_MNT/foo | cut -f 1 -d ' ')
> +       if [ $orig_hash != $hash ]; then
> +               echo "Mismatching hash values detected."
> +       fi
>
>         # Clone an entire extent from a higher range to a lower range.
> -       $CLONER_PROG -s 24576 -d 0 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/foo
> -
> -       # Check entire file, the 8Kb block at offset 0 now has the same content
> -       # as the 8Kb block at offset 24576.
> -       od -t x1 $SCRATCH_MNT/foo
> +       $CLONER_PROG -s $((6 * $BLOCK_SIZE)) -d 0 -l $((2 * $BLOCK_SIZE)) \
> +                    $SCRATCH_MNT/foo $SCRATCH_MNT/foo
> +       # Check entire file, 0th and 1st blocks now have the same content
> +       # as the 6th and 7th blocks.
> +       od -t x1 $SCRATCH_MNT/foo | _filter_od
>
>         # Clone an entire extent from a lower range to a higher range.
> -       $CLONER_PROG -s 8192 -d 16384 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/foo
> -
> -       # Check entire file, the 8Kb block at offset 0 now has the same content
> -       # as the 8Kb block at offset 24576, and the 8Kb block at offset 16384
> -       # now has the same content as the 8Kb block at offset 8192.
> -       od -t x1 $SCRATCH_MNT/foo
> -
> -       # Now clone 1 extent and an half into the file range starting at offset
> -       # 65536. So we get the second half of the extent at offset 16384 and the
> -       # whole extent at 24576 cloned into the middle of the 64Kb extent that
> -       # starts at file offset 32768. This makes the clone ioctl process more
> -       # extent items from the b+tree and forces a split of the large 64Kb
> -       # extent at the end of the file.
> -       $CLONER_PROG -s 20480 -d 65536 -l 12288 $SCRATCH_MNT/foo \
> -               $SCRATCH_MNT/foo
> -
> -       # Check entire file. Besides the previous changes, we now should have
> -       # 4096 bytes with the value 0x02 at file offset 65536, and 8192 bytes
> -       # with value 0x04 at the file offset 69632. The ranges [32768, 65536[
> -       # and [77824, 98304[ should remain with all bytes having the value 0x05.
> -       od -t x1 $SCRATCH_MNT/foo
> -
> -       # Now update 8Kb of data at offset 0. The extent at this position is a
> -       # clone of the extent at offset 24576. Check that writing to this offset
> -       # doesn't change data at offset 24576.
> -       $XFS_IO_PROG -c "pwrite -S 0xff -b 8192 0 8192" $SCRATCH_MNT/foo \
> -               | _filter_xfs_io
> -       od -t x1 $SCRATCH_MNT/foo
> +       $CLONER_PROG -s $((2 * $BLOCK_SIZE)) -d $((4 * $BLOCK_SIZE)) \
> +                    -l $((2 * $BLOCK_SIZE)) $SCRATCH_MNT/foo $SCRATCH_MNT/foo
> +       # Check entire file, 0th and 1st blocks now have the same content
> +       # as the 6th and 7th block, and 4th and 5th blocks now has the same
> +       # content as the 2nd and 3rd blocks.
> +       od -t x1 $SCRATCH_MNT/foo | _filter_od
> +
> +       # Now clone 1 extent and an half into the file range starting
> +       # at 16th block So we get the second half of the extent
> +       # starting at 4th block and the whole extent starting at 6th
> +       # block cloned into the middle of the 16 blocks extent that
> +       # starts at 8th block. This makes the clone ioctl process more
> +       # extent items from the b+tree and forces a split of the large
> +       # 16-block extent at the end of the file.
> +       $CLONER_PROG -s $((5 * $BLOCK_SIZE)) -d $((16 * $BLOCK_SIZE)) \
> +                    -l $((3 * $BLOCK_SIZE)) $SCRATCH_MNT/foo $SCRATCH_MNT/foo
> +
> +       # Check entire file. Besides the previous changes, we now
> +       # should have 1 block with the value 0x02 at 16th block, and 2
> +       # blocks with value 0x04 starting at the 17th block . The
> +       # block ranges [8, 16[ and [19, 24[ should remain with all
> +       # bytes having the value 0x05.
> +       od -t x1 $SCRATCH_MNT/foo | _filter_od
> +
> +       # Now update 2 blocks of data at offset 0. The extent at this
> +       # position is a clone of the extent at 6th block. Check that
> +       # writing to this offset doesn't change data at 6th block.
> +       $XFS_IO_PROG -c "pwrite -S 0xff -b $((2 * $BLOCK_SIZE)) 0 $((2 * $BLOCK_SIZE))" \
> +                    $SCRATCH_MNT/foo | _filter_xfs_io_blocks_modified
> +       od -t x1 $SCRATCH_MNT/foo | _filter_od
>
>         # Check that after defragmenting the file and re-mounting, the file
>         # content remains exactly the same as before.
>         _run_btrfs_util_prog filesystem defragment $SCRATCH_MNT/foo
>         _scratch_remount
> -       od -t x1 $SCRATCH_MNT/foo
> +       od -t x1 $SCRATCH_MNT/foo | _filter_od
>
>         # Verify that there are no consistency errors.
>         _check_scratch_fs
> diff --git a/tests/btrfs/052.out b/tests/btrfs/052.out
> index 53a1868..cb1e047 100644
> --- a/tests/btrfs/052.out
> +++ b/tests/btrfs/052.out
> @@ -1,499 +1,445 @@
>  QA output created by 052
>  Testing with a cow file (default)
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 8192
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 16384
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 24576
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 65536/65536 bytes at offset 32768
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> +Blocks modified: [0 - 1]
> +Blocks modified: [2 - 3]
> +Blocks modified: [4 - 5]
> +Blocks modified: [6 - 7]
> +Blocks modified: [8 - 23]
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0040000 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +Blocks modified: [0 - 1]
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> +30
>  Testing with a nocow file (-O nodatacow)
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 8192
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 16384
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 24576
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 65536/65536 bytes at offset 32768
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> +Blocks modified: [0 - 1]
> +Blocks modified: [2 - 3]
> +Blocks modified: [4 - 5]
> +Blocks modified: [6 - 7]
> +Blocks modified: [8 - 23]
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0040000 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +Blocks modified: [0 - 1]
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> +30
>  Testing with a cow file and lzo compression
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 8192
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 16384
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 24576
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 65536/65536 bytes at offset 32768
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> +Blocks modified: [0 - 1]
> +Blocks modified: [2 - 3]
> +Blocks modified: [4 - 5]
> +Blocks modified: [6 - 7]
> +Blocks modified: [8 - 23]
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0040000 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +Blocks modified: [0 - 1]
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> +30
>  Testing with a cow file and zlib compression
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 8192
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 16384
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 24576
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 65536/65536 bytes at offset 32768
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> +Blocks modified: [0 - 1]
> +Blocks modified: [2 - 3]
> +Blocks modified: [4 - 5]
> +Blocks modified: [6 - 7]
> +Blocks modified: [8 - 23]
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0040000 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +Blocks modified: [0 - 1]
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> +30
>  Testing with a nocow file and lzo compression
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 8192
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 16384
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 24576
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 65536/65536 bytes at offset 32768
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> +Blocks modified: [0 - 1]
> +Blocks modified: [2 - 3]
> +Blocks modified: [4 - 5]
> +Blocks modified: [6 - 7]
> +Blocks modified: [8 - 23]
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0040000 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +Blocks modified: [0 - 1]
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> +30
>  Testing with a nocow file and zlib compression
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 8192
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 16384
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 8192/8192 bytes at offset 24576
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -wrote 65536/65536 bytes at offset 32768
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> +Blocks modified: [0 - 1]
> +Blocks modified: [2 - 3]
> +Blocks modified: [4 - 5]
> +Blocks modified: [6 - 7]
> +Blocks modified: [8 - 23]
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
>  clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe  SCRATCH_MNT/foo
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0040000 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -wrote 8192/8192 bytes at offset 0
> -XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +Blocks modified: [0 - 1]
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +30
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>  *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
>  *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
>  *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
>  *
> -0300000
> +30
> --
> 2.1.0
>



-- 
Filipe David Manana,

"Reasonable men adapt themselves to the world.
 Unreasonable men adapt the world to themselves.
 That's why all progress depends on unreasonable men."