netdev - Re: [PATCH net-next 1/8] Move netfs_extract_iter_to

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Date: Sat, 27 May 2023 14:20:46 +0200
From: Simon Horman <simon.horman@...igine.com>
To: David Howells <dhowells@...hat.com>
Cc: netdev@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	David Ahern <dsahern@...nel.org>,
	Matthew Wilcox <willy@...radead.org>, Jens Axboe <axboe@...nel.dk>,
	linux-crypto@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>,
	Steve French <sfrench@...ba.org>,
	Shyam Prasad N <nspmangalore@...il.com>,
	Rohith Surabattula <rohiths.msft@...il.com>,
	linux-cachefs@...hat.com, linux-cifs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH net-next 1/8] Move netfs_extract_iter_to_sg() to
 lib/scatterlist.c

On Fri, May 26, 2023 at 03:30:57PM +0100, David Howells wrote:

...

> +/**
> + * netfs_extract_iter_to_sg - Extract pages from an iterator and add ot an sglist
> + * @iter: The iterator to extract from
> + * @maxsize: The amount of iterator to copy
> + * @sgtable: The scatterlist table to fill in
> + * @sg_max: Maximum number of elements in @sgtable that may be filled
> + * @extraction_flags: Flags to qualify the request
> + *
> + * Extract the page fragments from the given amount of the source iterator and
> + * add them to a scatterlist that refers to all of those bits, to a maximum
> + * addition of @sg_max elements.
> + *
> + * The pages referred to by UBUF- and IOVEC-type iterators are extracted and
> + * pinned; BVEC-, KVEC- and XARRAY-type are extracted but aren't pinned; PIPE-
> + * and DISCARD-type are not supported.
> + *
> + * No end mark is placed on the scatterlist; that's left to the caller.
> + *
> + * @extraction_flags can have ITER_ALLOW_P2PDMA set to request peer-to-peer DMA
> + * be allowed on the pages extracted.
> + *
> + * If successul, @sgtable->nents is updated to include the number of elements

Hi David,

I know you are just moving things about here.
But if you need to re-spin for some other reason,
perhaps you could correct the spelling of successful.

> + * added and the number of bytes added is returned.  @sgtable->orig_nents is
> + * left unaltered.
> + *
> + * The iov_iter_extract_mode() function should be used to query how cleanup
> + * should be performed.
> + */

...