Hello MacFusiliers,
I see there's been some discussion on forced unmounting (of 'dead'
filesystems), but I have some general questions.
I'm trying to make my app "do the right thing" when it comes to
orphaned filesystems. Clearly, it is possible for an abrupt shutdown
of the app to leave its VFS orphaned (easily reproduced while
debugging too), and I figured it would at least be nice if the app was
able to deal with this situation when restarted - i.e. force unmount a
dead FS at the expected mount point, before recreating a new 'live'
VFS in its place.
The code I have written to do this, attempts to do the 'obvious'
thing. I'm using BSD's unmount with the MNT_FORCE option (which
seemed to be necessary). When the app tries to create a new VFS at
this location however, I get a number of behaviours:
1. An 'internal error' from MacFUSE:
19/12/08 1:49:58 PM XXX[23525] XXFilesystem unable to mount because:
Error Domain=GMUserFileSystemErrorDomain Code=1003 UserInfo=0x1a292d0
"Internal fuse error (rc=0) while attempting to mount the file system.
For now, the best way to diagnose is to look for error messages using
Console.", userInfo={
NSLocalizedDescription = "Internal fuse error (rc=0) while
attempting to mount the file system. For now, the best way to diagnose
is to look for error messages using Console.";
}
2. Finder showing a folder with a no-entry decal at the mount point.
Reading the docs and comments, it seems that MacFUSE has a timeout
feature that may (eventually) automatically unmount 'dead'
filesystems, though I'm not sure I'm seeing this happen. Perhaps
timeout period does however affect the behaviour of MacFUSE when
attempts are made to forcibly unmount MacFUSE filesystems?
I guess I'm interested to know what the best practice would be for
handling this kind of situation. I'm using the latest MacFUSE 2.0,
and am on the latest Leopard (10.5.6).
Cheers
-- Luke
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