thread concurrent file operation

[Valdis.Kletnieks at vt.edu]

On Tue, 29 Jan 2013 18:25:19 +0100, Karaoui mohamed lamine said:

> This function is supposed to return the file reference, does do the locking?

Refcounting only, no locking provided by fdget.

> It seems that i can't find the lock instruction( with all those rcu
> instructions, i am little lost), can you guide me throught ?

Because it isn't there. Concurrent writes can happen - that's why lockf()
exists, so that multiple programs that want to scribble on the same file can do
their locking.

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