Date: Thu, 13 Aug 1998 16:36:10 +0100 From: "Alton, Matthew" <Matthew.Alton@anheuser-busch.com> To: "'FreeBSD-fs@FreeBSD.ORG'" <FreeBSD-fs@FreeBSD.ORG> Subject: LFS Hacking Message-ID: <31B3F0BF1C40D11192A700805FD48BF901776634@STLABCEXG011>
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What function call is used in the kernel to syncronously write data to a disk?
I mean really actually write it and change the polarity in the little
magnetic domains and everything such that I may assume that the
data is ON THE DISK when the call returns success.
How should I impliment "callback" in the kernel buffer cache flushing
mechanism so that the vm dosn't interfere with my write scheduling?
I need to know how to properly register a filesystem with the kernel
at boot time and how to register vm operations including union-of-set-preserving
NOOPs and how to "intercept" vm-issued fsyncs and whatever else.
A sort of pseudocode stack-trace of the whole shebang from userland
write(2) to data-on-the-disk would be wonderful.
What are we using instead of SYSV FSS-switch?
Once I get all this sorted out, I plan to write up a nice, pretty FS Hacker's
Guide for the Handbook. Please feel free to carry on at length about any
and all FS implementation particulars. I will give you credit in the Guide.
Matthew Alton
Computer Services - UNIX Systems Administration
(314)632-6644 matthew.alton@anheuser-busch.com
alton@plantnet.com
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