Re: [PATCH v3 01/55] netfs: Fix netfs_extract_iter_to_sg() for ITER_UBUF/IOVEC

[Jeff Layton]

On Fri, 2023-03-31 at 17:08 +0100, David Howells wrote:
> Fix netfs_extract_iter_to_sg() for ITER_UBUF and ITER_IOVEC to set the size
> of the page to the part of the page extracted, not the remaining amount of
> data in the extracted page array at that point.
> 
> This doesn't yet affect anything as cifs, the only current user, only
> passes in non-user-backed iterators.
> 
> Fixes: 018584697533 ("netfs: Add a function to extract an iterator into a scatterlist")
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
> cc: Jeff Layton <jlayton@xxxxxxxxxx>
> cc: Steve French <sfrench@xxxxxxxxx>
> cc: Shyam Prasad N <nspmangalore@xxxxxxxxx>
> cc: Rohith Surabattula <rohiths.msft@xxxxxxxxx>
> cc: linux-cachefs@xxxxxxxxxx
> cc: linux-cifs@xxxxxxxxxxxxxxx
> cc: linux-fsdevel@xxxxxxxxxxxxxxx
> ---
>  fs/netfs/iterator.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/netfs/iterator.c b/fs/netfs/iterator.c
> index e9a45dea748a..8a4c86687429 100644
> --- a/fs/netfs/iterator.c
> +++ b/fs/netfs/iterator.c
> @@ -139,7 +139,7 @@ static ssize_t netfs_extract_user_to_sg(struct iov_iter *iter,
>  			size_t seg = min_t(size_t, PAGE_SIZE - off, len);
>  
>  			*pages++ = NULL;
> -			sg_set_page(sg, page, len, off);
> +			sg_set_page(sg, page, seg, off);
>  			sgtable->nents++;
>  			sg++;
>  			len -= seg;
> 

Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>