Re: [PATCH 6/7] ext4: add mutex_is_locked() assertion to ext4_truncate()

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On Tue, Mar 26, 2013 at 10:31:29AM +0100, Lukáš Czerner wrote:
> 
> I have to admit I do not necessarily understand the reason for this.
> Have you seen any specific problem with mutex not being locked in
> the truncation path?

This was really me being paranoid more than anything else and wanting
to add more defensive programming.  I was originally just going to add
a comment, but decided it was better to put the assertion into the
code.

> Also, having mutex not locked in the truncation path is a bug so I
> am not sure why we only do WARN_ON_ONCE() which can be easily missed
> ? Can we do WARN_ON(), or WARN_ON_ONCE() + ext4_warning() ?

Agreed, WARN_ON() is probably more appropriate here.

							- Ted
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