On Apr 17, 6:17 am, Forest Bond <[EMAIL PROTECTED]> wrote: > Hi, > > I know direct_io is frowned upon in the MacFUSE camp, but I was hoping to get
Whatever gave you that impression? And I don't know this "camp" that you speak of! > some clarification as to whether or not mmap is disabled by using direct_io. > > (I think have to use direct_io, anyway, so this is not the only reason for > turning it on.) A file system cannot "disable" mmap() on Mac OS X. However, when you use direct_io, mmap() will not work, as should be the case, but you won't get to know that it doesn't work until you try to read/write that memory--at that point, you'll get a fault. Unfortunate, but like I said, that's how it is on Mac OS X. Without changing the kernel itself, this can't be improved. > In the current development version [1] of pytagsfs [2], I have a test for > whether mmap fails or not (initialization of the mmap should fail). It does > what it should on my Linux machine, but I'm having a hard time with MacFUSE. See above. > I'm using MacPorts to install dependencies, but I have replaced the MacPorts > fusefs-1.1 port with a fusefs-1.3 port (I modified the port file and created a > new tarball). However, I noticed that MacPorts has libfuse > fromhttp://fuse.sourceforge.net, rather than installing libfuse from MacFUSE. > Could > this be contributing to the issues that I am seeing? I am not very familiar with what MacPorts is doing. It's also odd and incorrect if they call it a "fusefs port". MacFUSE != Linux FUSE. The kext is a completely different implementation from Linux fusefs; they just happen to export similar (not even same) user-level interfaces. The kext's behavior, its nuances, subtleties, features, limitations are *very* different from Linux fusefs, and are often dictated by what's possible/impossible and needed/not needed on Mac OS X. "fusefs port" incorrectly implies otherwise. And libfuse != MacFUSE either. MacFUSE consists of a kernel extension (fusefs.kext), a user-space library (libfuse.dylib), programming headers, and a bunch of support tools/scripts. I don't know if this is contributing to any of your problems, but the only binary distribution I can support is the one I make available. Amit --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "macfuse-devel" group. To post to this group, send email to macfuse-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/macfuse-devel?hl=en -~----------~----~----~----~------~----~------~--~---
