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From: stevesu@copper.UUCP
Newsgroups: comp.unix.wizards,comp.bugs.4bsd
Subject: Re: 4.3BSD conversion question...
Message-ID: <971@copper.TEK.COM>
Date: Fri, 10-Apr-87 21:46:06 EST
Article-I.D.: copper.971
Posted: Fri Apr 10 21:46:06 1987
Date-Received: Sun, 12-Apr-87 01:06:28 EST
References: <622@rna.UUCP>
Organization: Tektronix Inc., Beaverton, Or.
Lines: 27
Xref: utgpu comp.unix.wizards:1730 comp.bugs.4bsd:288

In article <622@rna.UUCP>, dan@rna.UUCP (Dan Ts'o) writes:
> I noticed that when running 4.3BSD's fsck on 4.2BSD filesystems that it
> complains that the 4.2BSD directories are not multiples of 512 and ask to
> correct it.

I was just reading through the 4.3 documentation, and I came
across the following note ("Changes to the Kernel in 4.3BSD,"
section 4, under ufs_syscalls.c):

	_M_k_d_i_r now sets the size of all new directories to
	DIRBLKSIZE.

Now, DIRBLKSIZE is DEV_BSIZE which is 512, and it's not
inconceivable that efforts are also made to keep a directory a
multiple of 512 bytes long once some real files are created
within it.  (For all I know, the 4.2 kernel does this too.)

It would guess that the 512 character enforcement is just an
efficiency tweak, although for a fully upgraded 4.3 filesystem,
fsck's message would be a warning that 4.3 isn't keeping the
directories as aligned as it thinks it is.

In any case, I wouldn't worry about the warning, or about letting
fsck fix the "problem."

                                           Steve Summit
                                           stevesu@copper.tek.com