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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