Re: [RFC] hpfs_unlink() deadlock

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On Wed, 24 Feb 2016, Al Viro wrote:

> 	Since "HPFS: Introduce a global mutex and lock it on every callback
> from VFS" we had a deadlock in the "can't delete directory entry due to
> lack of space, try to truncate the sucker first" path - hpfs_lock() held
> through the area that contains notify_change() and hpfs_setattr() grabs
> it again.  BKL != mutex...
> 
> 	We could try to deal with that, but really, why not simply fail with
> -ENOSPC there?  It still can happen, even after truncate, so it's not as if
> the userland didn't have to cope with it.  And doing that would eliminate
> the last user of dentry_unhash(), allowing to kill that crap as well...

Yes, I think it's better to just fail instead of truncating the file.

Mikulas
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