New SCSI Driver for Mac OS X

[Ken Thomases]

On Apr 28, 2010, at 8:28 PM, Charles Davis wrote:

> On 4/28/10 5:48 PM, Ken Thomases wrote:
>> On Apr 28, 2010, at 6:18 PM, Charles Davis wrote:
>> 
>>> Besides, to use it, we'd have to call DADiskMount() directly instead of
>>> going through diskutil.
>> 
>> Huh?  Who goes through diskutil?
> NTDLL, when it gets a FSCTL_DISMOUNT_VOLUME.

Huh.  Weird.  I did not know that.

I can't speak for Alexandre, but I suspect he would be fine using the appropriate Mac-native framework, whether that would be DiskArbitration or CoreServices (FSUnmountVolumeSync()), over invoking a Mac-specific command via system().  (So long as it's a C API, of course. ;)


>> But, anyway, there's no barrier to registering such an approval callback.
> Like I said, it will work when ejection and unmount requests go through
> DA, but not for raw umount(2) or ioctl(2) with DKIOCEJECT.

Is this something you've tested?  I have not, but I would not be at all surprised if DiskArbitration had a kernel component.

For example, if I mount a disk image via the Finder and then use umount(8) to unmount it, I get the relevant NSWorkspaceDidUnmountNotification.  NSWorkspace is built on DiskArbitration's callbacks but umount(8) is not.  It just uses the unmount(2) system call.

(The above test was the quickest to hand.  I didn't take the time to write a direct DiskArbitration test case, with or without an unmount approval callback.)

-Ken