Date:   Thu, 17 Dec 2020 12:52:00 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Trond Myklebust <trondmy@...il.com>
Cc:     Chuck Lever <chuck.lever@...cle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>
Subject: Re: linux-next: manual merge of the cel tree with the nfs tree

Hi all,

On Tue, 15 Dec 2020 11:41:50 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> 
> Today's linux-next merge of the cel tree got a conflict in:
> 
>   include/linux/sunrpc/xdr.h
> 
> between commits:
> 
>   9a20f6f4e6ba ("SUNRPC: Fixes for xdr_align_data()")
>   c4f2f591f02c ("SUNRPC: Fix xdr_expand_hole()")
>   f8d0e60f1056 ("SUNRPC: Cleanup - constify a number of xdr_buf helpers")
> 
> from the nfs tree and commits:
> 
>   5a7e702670ad ("SUNRPC: Adjust synopsis of xdr_buf_subsegment()")
>   c1346a1216ab ("NFSD: Replace the internals of the READ_BUF() macro")
> 
> from the cel tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
> 
> 
> diff --cc include/linux/sunrpc/xdr.h
> index 68d49fdc4ee9,9b35ce50cf2b..000000000000
> --- a/include/linux/sunrpc/xdr.h
> +++ b/include/linux/sunrpc/xdr.h
> @@@ -182,14 -182,15 +182,15 @@@ xdr_adjust_iovec(struct kvec *iov, __be
>    * XDR buffer helper functions
>    */
>   extern void xdr_shift_buf(struct xdr_buf *, size_t);
>  -extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
>  +extern void xdr_buf_from_iov(const struct kvec *, struct xdr_buf *);
> - extern int xdr_buf_subsegment(const struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
> + extern int xdr_buf_subsegment(const struct xdr_buf *buf, struct xdr_buf *subbuf,
> + 			      unsigned int base, unsigned int len);
>   extern void xdr_buf_trim(struct xdr_buf *, unsigned int);
>  -extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
>  -extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
>  +extern int read_bytes_from_xdr_buf(const struct xdr_buf *, unsigned int, void *, unsigned int);
>  +extern int write_bytes_to_xdr_buf(const struct xdr_buf *, unsigned int, void *, unsigned int);
>   
>  -extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
>  -extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
>  +extern int xdr_encode_word(const struct xdr_buf *, unsigned int, u32);
>  +extern int xdr_decode_word(const struct xdr_buf *, unsigned int, u32 *);
>   
>   struct xdr_array2_desc;
>   typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
> @@@ -250,10 -251,54 +251,54 @@@ extern void xdr_init_decode_pages(struc
>   extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
>   extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
>   extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
>  -extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
>  -extern uint64_t xdr_align_data(struct xdr_stream *, uint64_t, uint32_t);
>  -extern uint64_t xdr_expand_hole(struct xdr_stream *, uint64_t, uint64_t);
>  +extern int xdr_process_buf(const struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
>  +extern unsigned int xdr_align_data(struct xdr_stream *, unsigned int offset, unsigned int length);
>  +extern unsigned int xdr_expand_hole(struct xdr_stream *, unsigned int offset, unsigned int length);
> + extern bool xdr_stream_subsegment(struct xdr_stream *xdr, struct xdr_buf *subbuf,
> + 				  unsigned int len);
> + 
> + /**
> +  * xdr_set_scratch_buffer - Attach a scratch buffer for decoding data.
> +  * @xdr: pointer to xdr_stream struct
> +  * @buf: pointer to an empty buffer
> +  * @buflen: size of 'buf'
> +  *
> +  * The scratch buffer is used when decoding from an array of pages.
> +  * If an xdr_inline_decode() call spans across page boundaries, then
> +  * we copy the data into the scratch buffer in order to allow linear
> +  * access.
> +  */
> + static inline void
> + xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen)
> + {
> + 	xdr->scratch.iov_base = buf;
> + 	xdr->scratch.iov_len = buflen;
> + }
> + 
> + /**
> +  * xdr_set_scratch_page - Attach a scratch buffer for decoding data
> +  * @xdr: pointer to xdr_stream struct
> +  * @page: an anonymous page
> +  *
> +  * See xdr_set_scratch_buffer().
> +  */
> + static inline void
> + xdr_set_scratch_page(struct xdr_stream *xdr, struct page *page)
> + {
> + 	xdr_set_scratch_buffer(xdr, page_address(page), PAGE_SIZE);
> + }
> + 
> + /**
> +  * xdr_reset_scratch_buffer - Clear scratch buffer information
> +  * @xdr: pointer to xdr_stream struct
> +  *
> +  * See xdr_set_scratch_buffer().
> +  */
> + static inline void
> + xdr_reset_scratch_buffer(struct xdr_stream *xdr)
> + {
> + 	xdr_set_scratch_buffer(xdr, NULL, 0);
> + }
>   
>   /**
>    * xdr_stream_remaining - Return the number of bytes remaining in the stream

This is now a conflict between the nfs tree and Linus' tree.

-- 
Cheers,
Stephen Rothwell

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