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Re: [PATCH 2/2] xfs: add FALLOC_FL_ZERO_RANGE to fallocate

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 2/2] xfs: add FALLOC_FL_ZERO_RANGE to fallocate
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Wed, 13 Jun 2012 08:24:12 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, Dave Chinner <dchinner@xxxxxxxxxx>, xfs@xxxxxxxxxxx
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Sender: Paolo Bonzini <paolo.bonzini@xxxxxxxxx>
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Il 13/06/2012 04:16, Dave Chinner ha scritto:
>> > +  BUG_ON((mode & FALLOC_FL_PUNCH_HOLE) && (mode & FALLOC_FL_ZERO_RANGE));
> Never put BUG_ON() or BUG() in XFS code that can return an error.
> Return EINVAL if we chose not to support it, and if it's really
> something we consider bad, emit a warning to syslog (i.e.
> xfs_warn()) and potentially add a ASSERT() case so that debug
> kernels will trip over it. Nobody should be panicing a production
> system just because a user supplied a set of incorrect syscall
> paramters....

I know, the BUG_ON() is because it is ruled out in VFS code.  Of course
if I remove that code, this will not be a BUG_ON() anymore.

Paolo

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