Re: [PATCH 2/8] Fix btrfs/052 to work on non-4k block sized filesystems

Filipe Manana
2015-12-10T17:28:19Z

On Mon, Nov 30, 2015 at 10:17 AM, Chandan Rajendra
<chandan@linux.vnet.ibm.com> wrote:
> This commit makes use of the new _filter_xfs_io_blocks_modified filtering
> function to print information in terms of file blocks rather than file
> offset.
>
> Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>

Thanks!

> ---
> tests/btrfs/052 | 122 +++++----
> tests/btrfs/052.out | 744 +++++++++++++++++++++++++++++++---------------------
> 2 files changed, 515 insertions(+), 351 deletions(-)
>
> diff --git a/tests/btrfs/052 b/tests/btrfs/052
> index c75193d..b760b92 100755
> --- a/tests/btrfs/052
> +++ b/tests/btrfs/052
> @@ -59,78 +59,98 @@ 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 extents of 2 blocks each and 1 extent
> + # 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
> + # Initial file content.
> + od -t x1 $SCRATCH_MNT/foo | _filter_od
>
> # 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
> + od -t x1 $SCRATCH_MNT/foo | _filter_od
>
> # 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
> + od -t x1 $SCRATCH_MNT/foo | _filter_od
>
> # 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..ac5924e 100644
> --- a/tests/btrfs/052.out
> +++ b/tests/btrfs/052.out
> @@ -1,499 +1,643 @@
> 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]
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe SCRATCH_MNT/foo
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> 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 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0040000 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0060000 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
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0200000 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
> *
> -0210000 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
> *
> -0230000 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
> -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
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +30
> +Blocks modified: [0 - 1]
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> *
> -0200000 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
> *
> -0210000 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
> *
> -0230000 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 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +30
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> *
> -0200000 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
> *
> -0210000 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
> *
> -0230000 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
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +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]
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe SCRATCH_MNT/foo
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> 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 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0040000 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +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
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -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
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +30
> +Blocks modified: [0 - 1]
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0300000
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +30
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0300000
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +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]
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe SCRATCH_MNT/foo
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> 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 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +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
> *
> -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]
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe SCRATCH_MNT/foo
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> 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 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0040000 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0060000 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
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0200000 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
> *
> -0210000 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
> *
> -0230000 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
> -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
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +30
> +Blocks modified: [0 - 1]
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> *
> -0200000 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
> *
> -0210000 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
> *
> -0230000 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 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +30
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> *
> -0200000 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
> *
> -0210000 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
> *
> -0230000 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
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +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]
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe SCRATCH_MNT/foo
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> 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 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0040000 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +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
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0300000
> -0000000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +30
> +0 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -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
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +30
> +Blocks modified: [0 - 1]
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0300000
> -0000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0020000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +30
> +0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> *
> -0060000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0100000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0200000 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> *
> -0210000 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +20 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> *
> -0230000 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +21 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> *
> -0300000
> +23 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +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]
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> clone failed: Invalid argument
> -5af7a1d6d3757be1e3e911ba5fdf4cbe SCRATCH_MNT/foo
> +0 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +30
> 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 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
> +*
> +2 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
> +*
> +4 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
> +*
> +6 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
> +*
> +10 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05
> +*
> +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
> *
> -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."