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From: ccc@cwruecmp.UUCP (Case Computer Club)
Newsgroups: net.unix
Subject: Re: Q's on: System V /etc/init....
Message-ID: <1334@cwruecmp.UUCP>
Date: Sun, 24-Nov-85 17:50:21 EST
Article-I.D.: cwruecmp.1334
Posted: Sun Nov 24 17:50:21 1985
Date-Received: Wed, 27-Nov-85 01:18:05 EST
References: <5749@fortune.UUCP> <2968@sun.uucp> <331@ncr-sd.UUCP> <3004@sun.uucp>
Reply-To: cmf%happy@cwruecmp.UUCP (Carl Fongheiser)
Organization: CWRU Dept. Computer Eng., Cleveland, OH
Lines: 28

In article <3004@sun.uucp> guy@sun.uucp (Guy Harris) writes:
>> And you \always/ want filesystem checks when the system goes down; only
>> in a development environment where you are rebooting frequently can I
>> imagine any other choice, and in that environment something special can
>> be done.  My particular wrinkle was that if the file /down was present,
>> it was assumed that the system was taken down cleanly and the filesystem
>> checks were skipped.
>
>4.2BSD's "fastboot" script uses the file "/fastboot" for the same purpose.
>4.2BSD has a field in the superblock, "fs_clean", which, according to the
>comments in <sys/fs.h>, says "file system is clean".  This flag should be
>cleared on a "umount" after all the cached blocks and inodes have been
>written to the disk, and should be set as soon as a file system is mounted
>read/write.  "fsck -p" could then skip file systems with this flag set.
>Unfortunately, the 4.2BSD filesystem code doesn't do this.  I think later
>versions of S5 with the "file system hardening" may provide a similar flag.
>

The current release of System V Release 2 for 3B2's provides this flag
(called s_state).  There's also a program called 'fsstat' which examines
this flag and returns an appropriate status so the rc files can decide
whether or not to run fsck on the device.

					Carl Fongheiser
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