Date: Wed, 16 Apr 1997 17:23:48 -0700 From: Aaron Smith <aaron@veritas.com> To: Terry Lambert <terry@lambert.org> Cc: hackers@freebsd.org Subject: Re: Feasibility of porting Linux filesystem code? Message-ID: <m0wHezO-000iX3C@megami.veritas.com> In-Reply-To: Your message of "Wed, 16 Apr 1997 16:16:32 PDT." <199704162316.QAA28363@phaeton.artisoft.com>
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After reading this, Terry, I can only conclude that you have a propensity for pretending knowlede of things you incompletely understand. Your standard technique appears to be: - make broad pronouncments - bring up graph theory Writing a journaling filesystem does not require any of the changes you mention. You don't know what you're talking about. This might be forgivable if your tone was speculative, but you act like you are laying down fact, when you could not be more wrong about what is required for a journalling filesystem. VERITAS VxFS (a journalled filesystem) runs on many, many different UNIX variants and none have had to modify the VFS layer or its interface. I would recommend easing up on your need to sound authoritative on topics you have not mastered. -- Aaron Smith aaron@veritas.com unless explicitly stated, i do not speak for my employer. support free speech. On Wed, 16 Apr 1997 16:16:32 PDT, Terry Lambert writes: [discussion of SGI xfs, some mentions of JFS and NTFS] >The Linux VFS interface is not reflexive; it's not cut at the right >place for a journalled FS. FreeBSD's is much better, but it's still >not there either... I've discussed this in detail with the guy who >wrote the read-only NTFS driver for Linux. You need to be able to >treat the VFS interface as if it were a transaction interface to do >things like event rollback. It helps if the internal treatment is >architected as event/responder, too. The same thing would help for >Soft Updates, which is basically a transaction order enforcement >mechanism, with the dependency graph statically computed (rendering >it FFS-specific).
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