Re: [PATCH v6 02/13] iomap: comment on atomic write checks in iomap_dio_bio_iter()

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On 17/03/2025 06:08, Christoph Hellwig wrote:
On Thu, Mar 13, 2025 at 05:12:59PM +0000, John Garry wrote:
  		if (iter->flags & IOMAP_ATOMIC_HW) {
+			/*
+			* Ensure that the mapping covers the full write length,
+			* otherwise we will submit multiple BIOs, which is
+			* disallowed.
+			*/

"disallowed" doesn't really explain anything, why is it disallowed?

Maybe:

			* Ensure that the mapping covers the full write length,
			* otherwise it can't be submitted as a single bio,
			* which is required to use hardware atomics.

ok, fine.







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