Write Ahead Physical Block Logging (WAPBL) provides metadata journaling forfile systems in conjunction withFast File System (FFS) to accomplish rapid filesystem consistency after an unclean shutdown of the filesystem and better general use performance over regular FFS.[1][2][3][4] With the journal,fsck is no longer required at system boot; instead, the system can replay the journal in order to correct any inconsistencies in the filesystem if the system has been shut down in an unclean fashion.[3]
WAPBL was initially committed into NetBSD in 2008, and first appeared with NetBSD 5.0 (2009).[5][2][6]
With NetBSD 6.0 (2012),soft updates (known assoft dependencies in NetBSD) was removed in favour ofWAPBL.[7][8]
Some highlights are: a preview of metadata journaling for FFS file systems (known as WAPBL, Write Ahead Physical Block Logging)
"softdep" support is no longer available in FFS; use wapbl(4) logging instead.
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