Re: [PATCH] block: Skip the folio lock if the folio is already dirty

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

On Fri, Jan 24, 2025 at 10:51:02PM +0000, Matthew Wilcox (Oracle) wrote:
>  	bio_for_each_folio_all(fi, bio) {
> +		if (folio_test_dirty(fi.folio))
> +			continue;

Can you add a comment why this is safe (the answer probably is "folio
dirtying through direct I/O is racy as hell anyway and we don't care")
and desirable?

Otherwise this looks great.