Re: Memory mapped file system

• Subject: Re: Memory mapped file system
• From: Louis Gerbarg <email@hidden>
• Date: Wed, 29 May 2002 10:06:29 -0700

I'm in search of a means, if any, of how to get a memory mapped filesystem
up an running on Darwin. I've found mount_mfs, which would appear to do
the trick, though I can't seem to get it to work and the man page is quite
lacking, in my opinion, on what needs to be done. I searched the net and
archives and couldn't find anything of recent relevance for mfs or other
ramfs mechanisms on Darwin. The closest was a post to the dev list some
time ago (2 years?) about mount_mfs being non-functional -- though there
was a patch -- though it couldn't be committed due to it's implementation.

I also found some information about mount_mfs being a "less than optimal"
memory mapped filesystem implementation (since it is/was currently written
to have read/writes go from user -> kernel -> user land before I/O) and
that there is room for improvement.

I couldn't find any status on where things are today. Any insight,
workarounds, information, etc would be helpful. If mount_mfs is working,
which device node does it need and does that node exist? An
Darwin-specific example usage would be nice. Thanks for the assistance.

Sean Morrison
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