Re: when is a block not a block?

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#4800

From: Peter da Silva
Date: Thu, 09 Aug 1990 23:17

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In article <d8zg02JJ01bI01@JUTS.ccc.amdahl.com> ked01@JUTS.ccc.amdahl.com (Kim DeVaughn) writes:
> While I understand that other such "oddities" may well arise in the future,
> what bothers me is not being able to ask the filesystem for the *true* info
> in a supported way.

*which* filesystem?

OFS, FFS, ram.handler, and network file systems all have different amounts of
overhead for a file. When you copy a file from FFS to OFS it grows by
512/448ths right off the bat. How do we figure that?

You need a call "RealSize(fs, nbytes)" to figure the real size of a file. That
might depend on what *directory* it's being moved into, if extra blocks need
to be allocated. Make it "RealSize(dir, nbytes)".

OK, now we just need to know the free space on a device. How do you figure free
space in RAM:? How about NFS:?

Sigh. Make a guess and punt, leaving space for slop.
-- 
Peter da Silva.   `-_-'
<peter@sugar.hackercorp.com>.

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!zaphod.mps.ohio-state.edu!lavaca.uh.edu!uhnix1!sugar!peter
From: peter@sugar.hackercorp.com (Peter da Silva)
Newsgroups: comp.sys.amiga.tech
Subject: Re: when is a block not a block?
Message-ID: <6321@sugar.hackercorp.com>
Date: 9 Aug 90 23:17:02 GMT
References: <6498.269a4527@vax1.tcd.ie> <648H02l0b8KM01@amdahl.uts.amdahl.com> <13237@cbmvax.commodore.com> <3fco02lsb9LE01@amdahl.uts.amdahl.com> <13342@cbmvax.commodore.com> <c4pK02n=01EQ01@JUTS.ccc.amdahl.com> <10797@wehi.dn.mu.oz> <d8zg02JJ01bI01@JUTS.ccc.amdahl.
Reply-To: peter@sugar.hackercorp.com (Peter da Silva)
Organization: Sugar Land Unix - Houston
Lines: 22

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