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

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

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