CVS commit: [netbsd-5-2] src/sys/ufs/lfs

["Soren Jacobsen" <snj%netbsd.org@localhost>]

Module Name:    src
Committed By:   snj
Date:           Sat Nov  7 20:31:22 UTC 2015

Modified Files:
        src/sys/ufs/lfs [netbsd-5-2]: lfs_segment.c

Log Message:
Pull up following revision(s) (requested by dholland in ticket #1974):
        sys/ufs/lfs/lfs_segment.c: revision 1.247 via patch
Fix catastrophic bug in lfs_rewind() that changed segment numbers
(lfs_curseg/lfs_nextseg in the superblock) using the wrong units.
These fields are for whatever reason the start addresses of segments
(measured in frags) rather than the segment numbers 0..n.
This only apparently affects dumping from a mounted fs; however, it
trashes the fs.
I would really, really like to have a static analysis tool that can
keep track of the units things are measured in, since fs code is full
of conversion macros and the macros are named inscrutable things like
"sntod" whose letters don't necessarily even correspond to the units
they convert. It is surprising that more of these are not wrong.


To generate a diff of this commit:
cvs rdiff -u -r1.213 -r1.213.22.1 src/sys/ufs/lfs/lfs_segment.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.