[PATCH 0/4] Output selection, improvements for ext4/001

[PATCH 0/4] Output selection, improvements for ext4/001

[Jan Kara]

Hello,

the patch series below addresses some issues with test ext4/001. The first
patch is just a minor improvement to _filter_fiemap to work with older awk
programs. The second patch updates expected output of the test because it
slightly changes after punch hole fixes.

Patch 3 implements function which allows selecting different output file based
on mount options (or basically any feature string that's passed to the function
- e.g. selection based on fs blocksize can be easily done as well). Current
helper _link_out_file() could be implemented using this as well but for now
I left it alone. I think this feature can be useful when different mount
options change behavior of the filesystem and thus different output is
generated but we want to have test working all mount options.

Patch 4 uses the output selection function in ext4/001 to select different
output files based on mount options.

Comments welcome!

								Honza

[PATCH 1/4] _filter_fiemap: Avoid awk interval regexps

[Jan Kara]

Older versions of awk do not accept interval regexps by default. Avoid
them in _filter_fiemap to keep better compatibility since it's pretty
trivial.

Signed-off-by: Jan Kara <jack@suse.com>
---
 common/punch | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/punch b/common/punch
index e8770ab834a7..be193d67ee56 100644
--- a/common/punch
+++ b/common/punch
@@ -208,7 +208,7 @@ _filter_fiemap()
 			print $1, $2, $3;
 			next;
 		}
-		$5 ~ /0x[[:xdigit:]]*8[[:xdigit:]]{2}/ {
+		$5 ~ /0x[[:xdigit:]]*8[[:xdigit:]][[:xdigit:]]/ {
 			print $1, $2, "unwritten";
 			next;
 		}
-- 
2.1.4

[PATCH 2/4] ext4/001: Update output

[Jan Kara]

After patch "ext4: Fix races of writeback with punch hole and zero
range" we don't flush range that's going to be zeroed out which results
in different final extent layout because some extents will be zeroed-out
instead of being split. Update the output file accordingly.

Signed-off-by: Jan Kara <jack@suse.com>
---
 tests/ext4/001.out | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/tests/ext4/001.out b/tests/ext4/001.out
index 212c24783387..c2f728483b23 100644
--- a/tests/ext4/001.out
+++ b/tests/ext4/001.out
@@ -131,14 +131,10 @@ cc63069677939f69a6e8f68cae6a6dac
 2: [32..39]: hole
 daa100df6e6711906b61c9ab5aa16032
 	11. data -> hole -> data
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
+0: [0..39]: data
 f6aeca13ec49e5b266cd1c913cd726e3
 	12. unwritten -> data -> unwritten
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
+0: [0..39]: unwritten
 daa100df6e6711906b61c9ab5aa16032
 	13. data -> unwritten -> data
 0: [0..7]: data
-- 
2.1.4

[PATCH 3/4] common: Add function for selecting from different output files

[Jan Kara]

Add function for selection of different output files. The idea is that
in config file ($seq.cfg) there are several lines like:

feat1,feat2: suffix

The function is passed a feature string (or uses MOUNT_OPTIONS if no
argument is passed) and selects output file with a suffix for which all
features are present in the feature string. If there is no matching
line, output with 'default' suffix is selected.

Signed-off-by: Jan Kara <jack@suse.com>
---
 common/rc | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/common/rc b/common/rc
index adf1edf64d8d..543780c92c59 100644
--- a/common/rc
+++ b/common/rc
@@ -3142,6 +3142,47 @@ get_block_size()
 	echo `stat -f -c %S $1`
 }
 
+_select_output()
+{
+	if [ $# -eq 0 ]; then
+		FEATURES=${MOUNT_OPTIONS##"-o "}
+	else
+		FEATURES=$1
+	fi
+
+	export FEATURES
+	seqfull=$SRC_DIR/$seqnum
+	perl -e '
+		my %feathash;
+		my $feature, $result, $suffix, $opts;
+
+		foreach $feature (split(/,/, $ENV{"FEATURES"})) {
+			$feathash{$feature} = 1;
+		}
+		$result = "default";
+		while (<>) {
+			my $found = 1;
+
+			chomp;
+			($opts, $suffix) = split(/ *: */);
+			foreach my $opt (split(/,/, $opts)) {
+				if (!exists($feathash{$opt})) {
+					$found = 0;
+					last;
+				}
+			}
+			if ($found == 1) {
+				$result = $suffix;
+				last;
+			}
+		}
+		print $result
+		' <$seqfull.cfg | {
+			read SUFFIX
+			ln -fs $seq.out.$SUFFIX $seqfull.out
+		}
+}
+
 init_rc
 
 ################################################################################
-- 
2.1.4

Re: [PATCH 3/4] common: Add function for selecting from different output files

[Dave Chinner]

On Wed, Nov 04, 2015 at 05:31:37PM +0100, Jan Kara wrote:
> Add function for selection of different output files. The idea is that
> in config file ($seq.cfg) there are several lines like:
> 
> feat1,feat2: suffix
> 
> The function is passed a feature string (or uses MOUNT_OPTIONS if no
> argument is passed) and selects output file with a suffix for which all
> features are present in the feature string. If there is no matching
> line, output with 'default' suffix is selected.
> 
> Signed-off-by: Jan Kara <jack@suse.com>

Looks like a good idea, but probably needs to be integrated into
_link_out_file(), which already does platform based output file
linking...

> ---
>  common/rc | 41 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
> 
> diff --git a/common/rc b/common/rc
> index adf1edf64d8d..543780c92c59 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -3142,6 +3142,47 @@ get_block_size()
>  	echo `stat -f -c %S $1`
>  }
>  
> +_select_output()
> +{
> +	if [ $# -eq 0 ]; then
> +		FEATURES=${MOUNT_OPTIONS##"-o "}
> +	else
> +		FEATURES=$1
> +	fi
> +
> +	export FEATURES
> +	seqfull=$SRC_DIR/$seqnum
> +	perl -e '
> +		my %feathash;
> +		my $feature, $result, $suffix, $opts;
> +
> +		foreach $feature (split(/,/, $ENV{"FEATURES"})) {
> +			$feathash{$feature} = 1;
> +		}
> +		$result = "default";
> +		while (<>) {
> +			my $found = 1;
> +
> +			chomp;
> +			($opts, $suffix) = split(/ *: */);
> +			foreach my $opt (split(/,/, $opts)) {
> +				if (!exists($feathash{$opt})) {
> +					$found = 0;
> +					last;
> +				}
> +			}
> +			if ($found == 1) {
> +				$result = $suffix;
> +				last;
> +			}
> +		}
> +		print $result
> +		' <$seqfull.cfg | {
> +			read SUFFIX
> +			ln -fs $seq.out.$SUFFIX $seqfull.out
> +		}
> +}

I'd much prefer the perl code simply returns the appropriately
matched suffix and then the shell code does the linking of the
output file. That way other things that the test harness is aware of
can also be taken into account.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

Re: [PATCH 3/4] common: Add function for selecting from different output files

[Jan Kara]

On Tue 17-11-15 08:29:24, Dave Chinner wrote:
> On Wed, Nov 04, 2015 at 05:31:37PM +0100, Jan Kara wrote:
> > Add function for selection of different output files. The idea is that
> > in config file ($seq.cfg) there are several lines like:
> > 
> > feat1,feat2: suffix
> > 
> > The function is passed a feature string (or uses MOUNT_OPTIONS if no
> > argument is passed) and selects output file with a suffix for which all
> > features are present in the feature string. If there is no matching
> > line, output with 'default' suffix is selected.
> > 
> > Signed-off-by: Jan Kara <jack@suse.com>
> 
> Looks like a good idea, but probably needs to be integrated into
> _link_out_file(), which already does platform based output file
> linking...

OK, will do.

> > ---
> >  common/rc | 41 +++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 41 insertions(+)
> > 
> > diff --git a/common/rc b/common/rc
> > index adf1edf64d8d..543780c92c59 100644
> > --- a/common/rc
> > +++ b/common/rc
> > @@ -3142,6 +3142,47 @@ get_block_size()
> >  	echo `stat -f -c %S $1`
> >  }
> >  
> > +_select_output()
> > +{
> > +	if [ $# -eq 0 ]; then
> > +		FEATURES=${MOUNT_OPTIONS##"-o "}
> > +	else
> > +		FEATURES=$1
> > +	fi
> > +
> > +	export FEATURES
> > +	seqfull=$SRC_DIR/$seqnum
> > +	perl -e '
> > +		my %feathash;
> > +		my $feature, $result, $suffix, $opts;
> > +
> > +		foreach $feature (split(/,/, $ENV{"FEATURES"})) {
> > +			$feathash{$feature} = 1;
> > +		}
> > +		$result = "default";
> > +		while (<>) {
> > +			my $found = 1;
> > +
> > +			chomp;
> > +			($opts, $suffix) = split(/ *: */);
> > +			foreach my $opt (split(/,/, $opts)) {
> > +				if (!exists($feathash{$opt})) {
> > +					$found = 0;
> > +					last;
> > +				}
> > +			}
> > +			if ($found == 1) {
> > +				$result = $suffix;
> > +				last;
> > +			}
> > +		}
> > +		print $result
> > +		' <$seqfull.cfg | {
> > +			read SUFFIX
> > +			ln -fs $seq.out.$SUFFIX $seqfull.out
> > +		}
> > +}
> 
> I'd much prefer the perl code simply returns the appropriately
> matched suffix and then the shell code does the linking of the
> output file. That way other things that the test harness is aware of
> can also be taken into account.

Well, the perl code does return (print) the selected suffix. But I guess
you dislike the piping into a shell block where the linking happens. I
wanted to save on some shell escaping but it actually won't be that bad.
I'll remove the pipe.

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

[PATCH 4/4] ext4/001: Select different output based on mount options

[Jan Kara]

Depending on mount options, we handle unwritten extents somewhat
differently. So sometimes we end up zeroing out unwritten extent and
converting it to written one and sometimes we just split it. Choose
expected output based on mount options.

Signed-off-by: Jan Kara <jack@suse.com>
---
 tests/ext4/001             |   3 +
 tests/ext4/001.cfg         |   2 +
 tests/ext4/001.out         | 333 ---------------------------------------------
 tests/ext4/001.out.default | 333 +++++++++++++++++++++++++++++++++++++++++++++
 tests/ext4/001.out.nozero  | 333 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 671 insertions(+), 333 deletions(-)
 create mode 100644 tests/ext4/001.cfg
 delete mode 100644 tests/ext4/001.out
 create mode 100644 tests/ext4/001.out.default
 create mode 100644 tests/ext4/001.out.nozero

diff --git a/tests/ext4/001 b/tests/ext4/001
index 5409f488dd54..e3d607784d23 100755
--- a/tests/ext4/001
+++ b/tests/ext4/001
@@ -48,6 +48,9 @@ _supported_os Linux
 _require_xfs_io_command "fzero"
 _require_test
 
+# Select appropriate golden output based on mount options
+_select_output
+
 testfile=$TEST_DIR/001.$$
 
 # Standard zero range tests
diff --git a/tests/ext4/001.cfg b/tests/ext4/001.cfg
new file mode 100644
index 000000000000..1942203f91ea
--- /dev/null
+++ b/tests/ext4/001.cfg
@@ -0,0 +1,2 @@
+dax: nozero
+dioread_nolock: nozero
diff --git a/tests/ext4/001.out b/tests/ext4/001.out
deleted file mode 100644
index c2f728483b23..000000000000
--- a/tests/ext4/001.out
+++ /dev/null
@@ -1,333 +0,0 @@
-QA output created by 001
-	1. into a hole
-0: [0..7]: hole
-1: [8..23]: unwritten
-2: [24..39]: hole
-daa100df6e6711906b61c9ab5aa16032
-	2. into allocated space
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	3. into unwritten space
-0: [0..39]: unwritten
-daa100df6e6711906b61c9ab5aa16032
-	4. hole -> data
-0: [0..7]: hole
-1: [8..23]: unwritten
-2: [24..31]: data
-3: [32..39]: hole
-cc63069677939f69a6e8f68cae6a6dac
-	5. hole -> unwritten
-0: [0..7]: hole
-1: [8..31]: unwritten
-2: [32..39]: hole
-daa100df6e6711906b61c9ab5aa16032
-	6. data -> hole
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: hole
-1b3779878366498b28c702ef88c4a773
-	7. data -> unwritten
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: hole
-1b3779878366498b28c702ef88c4a773
-	8. unwritten -> hole
-0: [0..23]: unwritten
-1: [24..39]: hole
-daa100df6e6711906b61c9ab5aa16032
-	9. unwritten -> data
-0: [0..23]: unwritten
-1: [24..31]: data
-2: [32..39]: hole
-cc63069677939f69a6e8f68cae6a6dac
-	10. hole -> data -> hole
-0: [0..7]: hole
-1: [8..31]: unwritten
-2: [32..39]: hole
-daa100df6e6711906b61c9ab5aa16032
-	11. data -> hole -> data
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	12. unwritten -> data -> unwritten
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-daa100df6e6711906b61c9ab5aa16032
-	13. data -> unwritten -> data
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	14. data -> hole @ EOF
-0: [0..23]: data
-1: [24..39]: unwritten
-e1f024eedd27ea6b1c3e9b841c850404
-	15. data -> hole @ 0
-0: [0..15]: unwritten
-1: [16..39]: data
-eecb7aa303d121835de05028751d301c
-	16. data -> cache cold ->hole
-0: [0..15]: unwritten
-1: [16..39]: data
-eecb7aa303d121835de05028751d301c
-	17. data -> hole in single block file
-0: [0..7]: data
-0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
-*
-0000200 0000 0000 0000 0000 0000 0000 0000 0000
-*
-0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
-*
-	1. into a hole
-0: [0..7]: hole
-1: [8..23]: unwritten
-2: [24..39]: hole
-daa100df6e6711906b61c9ab5aa16032
-	2. into allocated space
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	3. into unwritten space
-0: [0..39]: unwritten
-daa100df6e6711906b61c9ab5aa16032
-	4. hole -> data
-0: [0..7]: hole
-1: [8..23]: unwritten
-2: [24..31]: data
-3: [32..39]: hole
-cc63069677939f69a6e8f68cae6a6dac
-	5. hole -> unwritten
-0: [0..7]: hole
-1: [8..31]: unwritten
-2: [32..39]: hole
-daa100df6e6711906b61c9ab5aa16032
-	6. data -> hole
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: hole
-1b3779878366498b28c702ef88c4a773
-	7. data -> unwritten
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: hole
-1b3779878366498b28c702ef88c4a773
-	8. unwritten -> hole
-0: [0..23]: unwritten
-1: [24..39]: hole
-daa100df6e6711906b61c9ab5aa16032
-	9. unwritten -> data
-0: [0..23]: unwritten
-1: [24..31]: data
-2: [32..39]: hole
-cc63069677939f69a6e8f68cae6a6dac
-	10. hole -> data -> hole
-0: [0..7]: hole
-1: [8..31]: unwritten
-2: [32..39]: hole
-daa100df6e6711906b61c9ab5aa16032
-	11. data -> hole -> data
-0: [0..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	12. unwritten -> data -> unwritten
-0: [0..39]: unwritten
-daa100df6e6711906b61c9ab5aa16032
-	13. data -> unwritten -> data
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	14. data -> hole @ EOF
-0: [0..23]: data
-1: [24..39]: unwritten
-e1f024eedd27ea6b1c3e9b841c850404
-	15. data -> hole @ 0
-0: [0..15]: unwritten
-1: [16..39]: data
-eecb7aa303d121835de05028751d301c
-	16. data -> cache cold ->hole
-0: [0..15]: unwritten
-1: [16..39]: data
-eecb7aa303d121835de05028751d301c
-	17. data -> hole in single block file
-0: [0..7]: data
-0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
-*
-0000200 0000 0000 0000 0000 0000 0000 0000 0000
-*
-0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
-*
-	1. into a hole
-0: [0..7]: hole
-1: [8..23]: unwritten
-2: [24..39]: hole
-daa100df6e6711906b61c9ab5aa16032
-	2. into allocated space
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	3. into unwritten space
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	4. hole -> data
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	5. hole -> unwritten
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	6. data -> hole
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	7. data -> unwritten
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	8. unwritten -> hole
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	9. unwritten -> data
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	10. hole -> data -> hole
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	11. data -> hole -> data
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	12. unwritten -> data -> unwritten
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	13. data -> unwritten -> data
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	14. data -> hole @ EOF
-0: [0..23]: data
-1: [24..39]: unwritten
-e1f024eedd27ea6b1c3e9b841c850404
-	15. data -> hole @ 0
-0: [0..15]: unwritten
-1: [16..39]: data
-eecb7aa303d121835de05028751d301c
-	16. data -> cache cold ->hole
-0: [0..15]: unwritten
-1: [16..39]: data
-eecb7aa303d121835de05028751d301c
-	17. data -> hole in single block file
-0: [0..7]: data
-0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
-*
-0000200 0000 0000 0000 0000 0000 0000 0000 0000
-*
-0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
-*
-	1. into a hole
-0: [0..7]: hole
-1: [8..23]: unwritten
-2: [24..39]: hole
-daa100df6e6711906b61c9ab5aa16032
-	2. into allocated space
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	3. into unwritten space
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	4. hole -> data
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	5. hole -> unwritten
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	6. data -> hole
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	7. data -> unwritten
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	8. unwritten -> hole
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	9. unwritten -> data
-0: [0..7]: data
-1: [8..23]: unwritten
-2: [24..39]: data
-cc58a7417c2d7763adc45b6fcd3fa024
-	10. hole -> data -> hole
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	11. data -> hole -> data
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	12. unwritten -> data -> unwritten
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	13. data -> unwritten -> data
-0: [0..7]: data
-1: [8..31]: unwritten
-2: [32..39]: data
-f6aeca13ec49e5b266cd1c913cd726e3
-	14. data -> hole @ EOF
-0: [0..23]: data
-1: [24..39]: unwritten
-e1f024eedd27ea6b1c3e9b841c850404
-	15. data -> hole @ 0
-0: [0..15]: unwritten
-1: [16..39]: data
-eecb7aa303d121835de05028751d301c
-	16. data -> cache cold ->hole
-0: [0..15]: unwritten
-1: [16..39]: data
-eecb7aa303d121835de05028751d301c
-	17. data -> hole in single block file
-0: [0..7]: data
-0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
-*
-0000200 0000 0000 0000 0000 0000 0000 0000 0000
-*
-0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
-*
diff --git a/tests/ext4/001.out.default b/tests/ext4/001.out.default
new file mode 100644
index 000000000000..c2f728483b23
--- /dev/null
+++ b/tests/ext4/001.out.default
@@ -0,0 +1,333 @@
+QA output created by 001
+	1. into a hole
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	2. into allocated space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	3. into unwritten space
+0: [0..39]: unwritten
+daa100df6e6711906b61c9ab5aa16032
+	4. hole -> data
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..31]: data
+3: [32..39]: hole
+cc63069677939f69a6e8f68cae6a6dac
+	5. hole -> unwritten
+0: [0..7]: hole
+1: [8..31]: unwritten
+2: [32..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	6. data -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: hole
+1b3779878366498b28c702ef88c4a773
+	7. data -> unwritten
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: hole
+1b3779878366498b28c702ef88c4a773
+	8. unwritten -> hole
+0: [0..23]: unwritten
+1: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	9. unwritten -> data
+0: [0..23]: unwritten
+1: [24..31]: data
+2: [32..39]: hole
+cc63069677939f69a6e8f68cae6a6dac
+	10. hole -> data -> hole
+0: [0..7]: hole
+1: [8..31]: unwritten
+2: [32..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	11. data -> hole -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	12. unwritten -> data -> unwritten
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+daa100df6e6711906b61c9ab5aa16032
+	13. data -> unwritten -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	14. data -> hole @ EOF
+0: [0..23]: data
+1: [24..39]: unwritten
+e1f024eedd27ea6b1c3e9b841c850404
+	15. data -> hole @ 0
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	16. data -> cache cold ->hole
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	17. data -> hole in single block file
+0: [0..7]: data
+0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+0000200 0000 0000 0000 0000 0000 0000 0000 0000
+*
+0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+	1. into a hole
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	2. into allocated space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	3. into unwritten space
+0: [0..39]: unwritten
+daa100df6e6711906b61c9ab5aa16032
+	4. hole -> data
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..31]: data
+3: [32..39]: hole
+cc63069677939f69a6e8f68cae6a6dac
+	5. hole -> unwritten
+0: [0..7]: hole
+1: [8..31]: unwritten
+2: [32..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	6. data -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: hole
+1b3779878366498b28c702ef88c4a773
+	7. data -> unwritten
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: hole
+1b3779878366498b28c702ef88c4a773
+	8. unwritten -> hole
+0: [0..23]: unwritten
+1: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	9. unwritten -> data
+0: [0..23]: unwritten
+1: [24..31]: data
+2: [32..39]: hole
+cc63069677939f69a6e8f68cae6a6dac
+	10. hole -> data -> hole
+0: [0..7]: hole
+1: [8..31]: unwritten
+2: [32..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	11. data -> hole -> data
+0: [0..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	12. unwritten -> data -> unwritten
+0: [0..39]: unwritten
+daa100df6e6711906b61c9ab5aa16032
+	13. data -> unwritten -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	14. data -> hole @ EOF
+0: [0..23]: data
+1: [24..39]: unwritten
+e1f024eedd27ea6b1c3e9b841c850404
+	15. data -> hole @ 0
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	16. data -> cache cold ->hole
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	17. data -> hole in single block file
+0: [0..7]: data
+0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+0000200 0000 0000 0000 0000 0000 0000 0000 0000
+*
+0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+	1. into a hole
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	2. into allocated space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	3. into unwritten space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	4. hole -> data
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	5. hole -> unwritten
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	6. data -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	7. data -> unwritten
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	8. unwritten -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	9. unwritten -> data
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	10. hole -> data -> hole
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	11. data -> hole -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	12. unwritten -> data -> unwritten
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	13. data -> unwritten -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	14. data -> hole @ EOF
+0: [0..23]: data
+1: [24..39]: unwritten
+e1f024eedd27ea6b1c3e9b841c850404
+	15. data -> hole @ 0
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	16. data -> cache cold ->hole
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	17. data -> hole in single block file
+0: [0..7]: data
+0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+0000200 0000 0000 0000 0000 0000 0000 0000 0000
+*
+0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+	1. into a hole
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	2. into allocated space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	3. into unwritten space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	4. hole -> data
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	5. hole -> unwritten
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	6. data -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	7. data -> unwritten
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	8. unwritten -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	9. unwritten -> data
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	10. hole -> data -> hole
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	11. data -> hole -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	12. unwritten -> data -> unwritten
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	13. data -> unwritten -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	14. data -> hole @ EOF
+0: [0..23]: data
+1: [24..39]: unwritten
+e1f024eedd27ea6b1c3e9b841c850404
+	15. data -> hole @ 0
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	16. data -> cache cold ->hole
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	17. data -> hole in single block file
+0: [0..7]: data
+0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+0000200 0000 0000 0000 0000 0000 0000 0000 0000
+*
+0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
diff --git a/tests/ext4/001.out.nozero b/tests/ext4/001.out.nozero
new file mode 100644
index 000000000000..c631034e3ec1
--- /dev/null
+++ b/tests/ext4/001.out.nozero
@@ -0,0 +1,333 @@
+QA output created by 001
+	1. into a hole
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	2. into allocated space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	3. into unwritten space
+0: [0..39]: unwritten
+daa100df6e6711906b61c9ab5aa16032
+	4. hole -> data
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..31]: data
+3: [32..39]: hole
+cc63069677939f69a6e8f68cae6a6dac
+	5. hole -> unwritten
+0: [0..7]: hole
+1: [8..31]: unwritten
+2: [32..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	6. data -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: hole
+1b3779878366498b28c702ef88c4a773
+	7. data -> unwritten
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: hole
+1b3779878366498b28c702ef88c4a773
+	8. unwritten -> hole
+0: [0..23]: unwritten
+1: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	9. unwritten -> data
+0: [0..23]: unwritten
+1: [24..31]: data
+2: [32..39]: hole
+cc63069677939f69a6e8f68cae6a6dac
+	10. hole -> data -> hole
+0: [0..7]: hole
+1: [8..31]: unwritten
+2: [32..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	11. data -> hole -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	12. unwritten -> data -> unwritten
+0: [0..39]: unwritten
+daa100df6e6711906b61c9ab5aa16032
+	13. data -> unwritten -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	14. data -> hole @ EOF
+0: [0..23]: data
+1: [24..39]: unwritten
+e1f024eedd27ea6b1c3e9b841c850404
+	15. data -> hole @ 0
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	16. data -> cache cold ->hole
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	17. data -> hole in single block file
+0: [0..7]: data
+0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+0000200 0000 0000 0000 0000 0000 0000 0000 0000
+*
+0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+	1. into a hole
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	2. into allocated space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	3. into unwritten space
+0: [0..39]: unwritten
+daa100df6e6711906b61c9ab5aa16032
+	4. hole -> data
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..31]: data
+3: [32..39]: hole
+cc63069677939f69a6e8f68cae6a6dac
+	5. hole -> unwritten
+0: [0..7]: hole
+1: [8..31]: unwritten
+2: [32..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	6. data -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: hole
+1b3779878366498b28c702ef88c4a773
+	7. data -> unwritten
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: hole
+1b3779878366498b28c702ef88c4a773
+	8. unwritten -> hole
+0: [0..23]: unwritten
+1: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	9. unwritten -> data
+0: [0..23]: unwritten
+1: [24..31]: data
+2: [32..39]: hole
+cc63069677939f69a6e8f68cae6a6dac
+	10. hole -> data -> hole
+0: [0..7]: hole
+1: [8..31]: unwritten
+2: [32..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	11. data -> hole -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	12. unwritten -> data -> unwritten
+0: [0..39]: unwritten
+daa100df6e6711906b61c9ab5aa16032
+	13. data -> unwritten -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	14. data -> hole @ EOF
+0: [0..23]: data
+1: [24..39]: unwritten
+e1f024eedd27ea6b1c3e9b841c850404
+	15. data -> hole @ 0
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	16. data -> cache cold ->hole
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	17. data -> hole in single block file
+0: [0..7]: data
+0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+0000200 0000 0000 0000 0000 0000 0000 0000 0000
+*
+0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+	1. into a hole
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	2. into allocated space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	3. into unwritten space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	4. hole -> data
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	5. hole -> unwritten
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	6. data -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	7. data -> unwritten
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	8. unwritten -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	9. unwritten -> data
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	10. hole -> data -> hole
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	11. data -> hole -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	12. unwritten -> data -> unwritten
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	13. data -> unwritten -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	14. data -> hole @ EOF
+0: [0..23]: data
+1: [24..39]: unwritten
+e1f024eedd27ea6b1c3e9b841c850404
+	15. data -> hole @ 0
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	16. data -> cache cold ->hole
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	17. data -> hole in single block file
+0: [0..7]: data
+0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+0000200 0000 0000 0000 0000 0000 0000 0000 0000
+*
+0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+	1. into a hole
+0: [0..7]: hole
+1: [8..23]: unwritten
+2: [24..39]: hole
+daa100df6e6711906b61c9ab5aa16032
+	2. into allocated space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	3. into unwritten space
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	4. hole -> data
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	5. hole -> unwritten
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	6. data -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	7. data -> unwritten
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	8. unwritten -> hole
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	9. unwritten -> data
+0: [0..7]: data
+1: [8..23]: unwritten
+2: [24..39]: data
+cc58a7417c2d7763adc45b6fcd3fa024
+	10. hole -> data -> hole
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	11. data -> hole -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	12. unwritten -> data -> unwritten
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	13. data -> unwritten -> data
+0: [0..7]: data
+1: [8..31]: unwritten
+2: [32..39]: data
+f6aeca13ec49e5b266cd1c913cd726e3
+	14. data -> hole @ EOF
+0: [0..23]: data
+1: [24..39]: unwritten
+e1f024eedd27ea6b1c3e9b841c850404
+	15. data -> hole @ 0
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	16. data -> cache cold ->hole
+0: [0..15]: unwritten
+1: [16..39]: data
+eecb7aa303d121835de05028751d301c
+	17. data -> hole in single block file
+0: [0..7]: data
+0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
+0000200 0000 0000 0000 0000 0000 0000 0000 0000
+*
+0000400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
+*
-- 
2.1.4