Re: [PATCH] loop, zloop: fix dma_alignment for large or unreported limits

On Mon, Aug 10, 2026 at 09:42:17AM -0700, Keith Busch wrote:
> From: Keith Busch <[email protected]>
> 
> A file system sets STATX_DIOALIGN with zeroed alignments when the file
> can't be used for direct I/O. The zero underflowed to UINT_MAX and
> triggered a queue limits validation warning. Fall back to the block
> device's limits when dio_mem_align isn't reported.
> 
> A file system with a block size larger than PAGE_SIZE may also report a
> memory alignment that can't be expressed as a queue limit. File systems
> fall back to buffered I/O for requests that don't meet their alignment,
> so cap the reported limit to the largest possible value.

In general having separate patches per driver would seem nicer than a
batched up one like this, but the changes do look good:

Reviewed-by: Christoph Hellwig <[email protected]>