<s>
Write	B-Application
Ahead	I-Application
Physical	I-Application
Block	I-Application
Logging	I-Application
(	O
WAPBL	B-Application
)	O
provides	O
meta	O
data	B-Application
journaling	I-Application
for	O
file	B-Application
systems	I-Application
in	O
conjunction	O
with	O
Fast	B-Operating_System
File	I-Operating_System
System	I-Operating_System
(	O
FFS	O
)	O
to	O
accomplish	O
rapid	O
filesystem	B-Application
consistency	O
after	O
an	O
unclean	O
shutdown	O
of	O
the	O
filesystem	B-Application
and	O
better	O
general	O
use	O
performance	O
over	O
regular	O
FFS	O
.	O
</s>
<s>
With	O
the	O
journal	O
,	O
fsck	B-Device
is	O
no	O
longer	O
required	O
at	O
system	O
boot	O
;	O
instead	O
,	O
the	O
system	O
can	O
replay	O
the	O
journal	O
in	O
order	O
to	O
correct	O
any	O
inconsistencies	O
in	O
the	O
filesystem	B-Application
if	O
the	O
system	O
has	O
been	O
shut	O
down	O
in	O
an	O
unclean	O
fashion	O
.	O
</s>
<s>
WAPBL	B-Application
was	O
initially	O
committed	O
into	O
NetBSD	B-Device
in	O
2008	O
,	O
and	O
first	O
appeared	O
with	O
NetBSD	B-Device
5.0	O
(	O
2009	O
)	O
.	O
</s>
<s>
With	O
NetBSD	B-Device
6.0	O
(	O
2012	O
)	O
,	O
soft	B-Application
updates	I-Application
(	O
known	O
as	O
soft	B-Application
dependencies	I-Application
in	O
NetBSD	B-Device
)	O
was	O
removed	O
in	O
favour	O
of	O
WAPBL	B-Application
.	O
</s>
