On Mon, Mar 15, 2021 at 01:39:13PM +0800, Qu Wenruo wrote: > During the fstests run for btrfs subpage read-write support, generic/475 > crashes the system with a very high chance. > > It turns out the cause is also affecting btrfs subpage read-only mount > so it's worthy a quick fix. > > Also the crash call site shows a new rabbit hole of hard coded > PAGE_SHIFT in readahead.
There's still a lot of PAGE_SHIFT use, not all of them are wrong but I think we'll need to do an audit and categorize the valid uses, otherwise it'll be a whack-a-mole.
