Trond Myklebust wrote:

>You can if and only if
>
>  - The dentry is unhashed, and you are holding the semaphore dir->i_sem
>on the parent directory.
>OR
>  - You are holding the spin lock dcache_lock.
>  
>
I decide to hold the dir->i_sem semaphore since d_drop() needs the
dcache_lock to do the unhashing...

>Note: on 2.6.x, the second condition needs to be modified a bit: you
>probably need to hold dentry->d_lock too since the 2.6.x version of
>d_lookup() is by and large lockless...
>  
>
I'll take a look asaic...

SteveD.