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Date:      Thu, 15 Jul 1999 01:59:46 +0000 (GMT)
From:      Terry Lambert <>
To: (David Schwartz)
Cc:,, chat@FreeBSD.ORG
Subject:   Re: Known MMAP() race conditions ... ?
Message-ID:  <>
In-Reply-To: <000201bece25$066b7510$> from "David Schwartz" at Jul 14, 99 11:16:42 am

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> > threads. Log-based system. There's nothing I know of in any UNIX
> 	That should read "log-based file system". I'm talking about NTFS. And it
> beats an fsck any day.

NTFS is significantly slower that even an unmodified FFS in sync mode.

A modified FFS (i.e. with soft updates) does not require a fsck, but
no one has bothered to write a cylinder group bitmap cleaner for it,
which could easily run in the background. That, and disable the
"clean bit" code, and distinguish "disk related OS failure" from
"non-disk related OS failure" for the purposes of doing a full fsck
on disk related OS failures.

Note also that SGI is supposed to be releasing XFS sources some
time soon; IMO, it would be trivial to port it; I don't know if
I would bother with the plex manager (I like Simon's code for that),
given that their non-unified VM and buffer cache have the buffer
cache sandwiched between XFS and the manager.

					Terry Lambert
Any opinions in this posting are my own and not those of my present
or previous employers.

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