Re: [RFC, PATCH] locks: remove posix deadlock detection

[Jiri Kosina <jikos@jikos.cz>]

On Sun, 28 Oct 2007, J. Bruce Fields wrote:

> But, OK, if we can identify unshared current->files at the time we put a 
> task to sleep, then a slight modification of our current algorithm might 
> be sufficient to detect any deadlock that involves purely posix file 
> locks and processes.  And we can tell people that avoiding deadlock is 
> their problem as soon as any task with a shared current->files is 
> involved.  (Ditto, I assume, if nfsd/lockd acquires a lock.)

Don't forget that comparing file_lock->fl_owner (i.e. current->files) is 
not the only way how lock ownership could be computed (there could be 
specific file_lock->fl_lmops->fl_compare_owner() and all of them should 
be teached this new semantics, right?).

-- 
Jiri Kosina
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