On Tue, Jan 24, 2023 at 05:01:08PM +0000, David Howells wrote: > This will pin pages or leave them unaltered rather than getting a ref on > them as appropriate to the iterator. > > The pages need to be pinned for DIO rather than having refs taken on them > to prevent VM copy-on-write from malfunctioning during a concurrent fork() > (the result of the I/O could otherwise end up being visible to/affected by > the child process). Reviewed-by: Christoph Hellwig <hch@xxxxxx>
