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Re: Hooking mount events from within kernel.

On Aug 25, 2008, at 9:23 PM, Maxim Zhuravlev wrote:
What do you mean by "hook" here? 

I mean, I need to get notified on every mount/umount event. I.e. I
need, say, some kauth semantics for mount/umount.

What problem you are actually trying to solve that you think hooking mounts
and unmounts will solve for you? 

I need to do some initialization in my kext for newly coming
filesystem on mount and some invalidation for umonted filesystem based
on it's device id ( in terms of stat() ) or fsid (in terms of vnodes).

There are no kauth hooks for mount/unmount notification, as the permissions are vetted before you get there, and so there are no allow/ deny hooks in kernel space.

You can get notification through disk arbitration in user space, and then call down into your KEXT to tell it about the events. This is typically done with DARegisterDiskMountApprovalCallback and DARegisterDiskUnmountApprovalCallback, which would allow you to ensure mostly synchronous operation.

More information is available at:

<http://developer.apple.com/DOCUMENTATION/Darwin/Reference/DiscArbitrationFramework/DiskArbitration/index.html >

-- Terry
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References: 
 >Hooking mount events from within kernel. (From: "Maxim Zhuravlev" <email@hidden>)
 >Re: Hooking mount events from within kernel. (From: "Maxim Zhuravlev" <email@hidden>)
 >Re: Hooking mount events from within kernel. (From: Terry Lambert <email@hidden>)
 >Re: Hooking mount events from within kernel. (From: "Maxim Zhuravlev" <email@hidden>)



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