Re: [PATCH 6/6] xfs: support lowmode allocations in xfs_bmap_exact_minlen_extent_alloc

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On Wed, Aug 21, 2024 at 09:07:23AM -0700, Darrick J. Wong wrote:
> On Tue, Aug 20, 2024 at 07:04:57PM +0200, Christoph Hellwig wrote:
> > Currently the debug-only xfs_bmap_exact_minlen_extent_alloc allocation
> > variant fails to drop into the lowmode last restor allocator, and
> 
>                                          last resort?

Yes.

> > +	/*
> > +	 * Use the low space allocator as it first does a "normal" AG iteration
> > +	 * and then drops the reservation to minlen, which might be required to
> > +	 * find an allocation for the transaction reservation when the file
> > +	 * system is very full.
> 
> Isn't it already doing a minlen allocation?  Oh, that probably refers to
> shrinking args->total, doesn't it.

Yes, without this patch ap->total is left at the full value and never
reduced.





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