Date: Tue, 7 Apr 2009 14:50:15 +0200 From: Stephan Lichtenauer <fbsdlists@honeyguide.net> To: freebsd-hackers@freebsd.org Cc: Gabriele Modena <gabriele.modena@gmail.com>, Robert Watson <rwatson@freebsd.org> Subject: Re: GSoC: Semantic File System Message-ID: <DD0763BE-B26E-4FDA-8273-520DC1E2A082@honeyguide.net> In-Reply-To: <alpine.BSF.2.00.0904021813110.94891@fledge.watson.org> References: <1fe1d5d60903210422g70efef15hdd685695cdf8df3c@mail.gmail.com> <alpine.BSF.2.00.0903221649590.51184@fledge.watson.org> <1fe1d5d60904020904ya6dcb00h54a54d6a00e2bd0@mail.gmail.com> <alpine.BSF.2.00.0904021813110.94891@fledge.watson.org>
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Gabriele, Robert, Am 02.04.2009 um 19:26 schrieb Robert Watson: > > In the BeOS model, or my reinterpretation based on something I read > a long time ago and then presumably had dreams about, the split is a > bit different: the file system maintains indexes of extended > attributes, which are written by applications in order to expose > searchable material. For example, a mail application might write > out each message as a file, and attach a series of extended > attributes, such as subject line, date, author, etc. These extended > attributes are then indexed automatically by the file system in > order to allow queries to be evaluated. I don't recall how queries > and results are expressed, and in particular, whether the queries > are processed by the file system (possibly exposed via special APIs > or the name space) or userspace (accessing special files maintained > by the kernel that are the indexes). > > It's also worth observing that one of the authors of BFS was Dominic > Giampaolo, who now works on Apple's HFS+, and implemented fsevents > there as part of their Spotlight project. > Maybe you also might be interested that there is a PDF document (formerly book) from Dominic available describing the BeOS file system in great detail: http://www.haiku-os.org/legacy-docs/practical-file-system-design.pdf Additionally, there seems to be a GSoC project to create something like Spotlight for Haiku, the open source BeOS clone. You could browse through the haiku-developer mailing list archives at http://www.freelists.org/archive/haiku-development , the thread where this has been discussed is titled "Need Some GSoC Advice" with the first mail from 21 March. Stephan
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