On Thu, Oct 22, 2020 at 09:58:34PM +0800, Hao Xu wrote: > The commit 324bcf54c449 changed the code path of async buffered reads > to go with the page_cache_sync_readahead() way when readahead is > disabled, meanwhile the sync buffered reads are forced to do IO in the > above way as well, which makes it go to a more complex code path. But ->readpage is (increasingly) synchronous while readahead should be used to start async I/Os. I'm pretty sure Jens meant to do exactly what he did.
