CVS commit: src/sbin/fsck_ffs

[Manuel Bouyer <bouyer%netbsd.org@localhost>]

Module Name:    src
Committed By:   bouyer
Date:           Sun Sep 13 14:25:28 UTC 2009

Modified Files:
        src/sbin/fsck_ffs: extern.h setup.c wapbl.c

Log Message:
Do some basic checks of the WAPBL journal, to abort the boot before the
kernel refuse to mount a filesystem read-write (booting a system
multiuser with critical filesystems read-only is bad):
Add a check_wapbl() which will check some WAPBL values in the superblock,
and try to read the journal via wapbl_replay_start() if there is one.
pfatal() if one of these fail (abort boot if in preen mode,
as "CONTINUE" otherwise). In non-preen mode the bogus journal will
be cleared.
check_wapbl() is always called if the superblock supports WAPBL.
Even if FS_DOWAPBL is not there, there could be flags asking the
kernel to clear or create a log with bogus values which would cause the
kernel refuse to mount the filesystem.
Discussed in
http://mail-index.netbsd.org/tech-kern/2009/08/17/msg005896.html
and followups.


To generate a diff of this commit:
cvs rdiff -u -r1.24 -r1.25 src/sbin/fsck_ffs/extern.h
cvs rdiff -u -r1.87 -r1.88 src/sbin/fsck_ffs/setup.c
cvs rdiff -u -r1.3 -r1.4 src/sbin/fsck_ffs/wapbl.c

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