Re: [PATCH v9 7/8] block: Convert bio_iov_iter_get_pages to use iov_iter_extract_pages

[Christoph Hellwig]

On Tue, Jan 24, 2023 at 05:01:07PM +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 affected by/visible to the
> child process).


Reviewed-by: Christoph Hellwig <hch@xxxxxx>