555 строки
16 KiB
C
555 строки
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* XDR standard data types and function declarations
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*
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* Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
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*
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* Based on:
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* RFC 4506 "XDR: External Data Representation Standard", May 2006
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*/
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#ifndef _SUNRPC_XDR_H_
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#define _SUNRPC_XDR_H_
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#include <linux/uio.h>
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#include <asm/byteorder.h>
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#include <asm/unaligned.h>
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#include <linux/scatterlist.h>
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struct bio_vec;
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struct rpc_rqst;
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/*
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* Buffer adjustment
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*/
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#define XDR_QUADLEN(l) (((l) + 3) >> 2)
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/*
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* Generic opaque `network object.' At the kernel level, this type
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* is used only by lockd.
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*/
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#define XDR_MAX_NETOBJ 1024
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struct xdr_netobj {
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unsigned int len;
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u8 * data;
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};
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/*
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* Basic structure for transmission/reception of a client XDR message.
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* Features a header (for a linear buffer containing RPC headers
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* and the data payload for short messages), and then an array of
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* pages.
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* The tail iovec allows you to append data after the page array. Its
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* main interest is for appending padding to the pages in order to
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* satisfy the int_32-alignment requirements in RFC1832.
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*
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* For the future, we might want to string several of these together
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* in a list if anybody wants to make use of NFSv4 COMPOUND
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* operations and/or has a need for scatter/gather involving pages.
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*/
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struct xdr_buf {
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struct kvec head[1], /* RPC header + non-page data */
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tail[1]; /* Appended after page data */
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struct bio_vec *bvec;
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struct page ** pages; /* Array of pages */
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unsigned int page_base, /* Start of page data */
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page_len, /* Length of page data */
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flags; /* Flags for data disposition */
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#define XDRBUF_READ 0x01 /* target of file read */
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#define XDRBUF_WRITE 0x02 /* source of file write */
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#define XDRBUF_SPARSE_PAGES 0x04 /* Page array is sparse */
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unsigned int buflen, /* Total length of storage buffer */
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len; /* Length of XDR encoded message */
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};
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static inline void
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xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
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{
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buf->head[0].iov_base = start;
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buf->head[0].iov_len = len;
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buf->tail[0].iov_len = 0;
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buf->pages = NULL;
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buf->page_len = 0;
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buf->flags = 0;
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buf->len = 0;
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buf->buflen = len;
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}
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/*
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* pre-xdr'ed macros.
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*/
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#define xdr_zero cpu_to_be32(0)
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#define xdr_one cpu_to_be32(1)
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#define xdr_two cpu_to_be32(2)
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#define rpc_auth_null cpu_to_be32(RPC_AUTH_NULL)
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#define rpc_auth_unix cpu_to_be32(RPC_AUTH_UNIX)
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#define rpc_auth_short cpu_to_be32(RPC_AUTH_SHORT)
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#define rpc_auth_gss cpu_to_be32(RPC_AUTH_GSS)
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#define rpc_call cpu_to_be32(RPC_CALL)
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#define rpc_reply cpu_to_be32(RPC_REPLY)
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#define rpc_msg_accepted cpu_to_be32(RPC_MSG_ACCEPTED)
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#define rpc_success cpu_to_be32(RPC_SUCCESS)
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#define rpc_prog_unavail cpu_to_be32(RPC_PROG_UNAVAIL)
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#define rpc_prog_mismatch cpu_to_be32(RPC_PROG_MISMATCH)
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#define rpc_proc_unavail cpu_to_be32(RPC_PROC_UNAVAIL)
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#define rpc_garbage_args cpu_to_be32(RPC_GARBAGE_ARGS)
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#define rpc_system_err cpu_to_be32(RPC_SYSTEM_ERR)
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#define rpc_drop_reply cpu_to_be32(RPC_DROP_REPLY)
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#define rpc_mismatch cpu_to_be32(RPC_MISMATCH)
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#define rpc_auth_error cpu_to_be32(RPC_AUTH_ERROR)
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#define rpc_auth_ok cpu_to_be32(RPC_AUTH_OK)
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#define rpc_autherr_badcred cpu_to_be32(RPC_AUTH_BADCRED)
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#define rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED)
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#define rpc_autherr_badverf cpu_to_be32(RPC_AUTH_BADVERF)
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#define rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF)
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#define rpc_autherr_tooweak cpu_to_be32(RPC_AUTH_TOOWEAK)
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#define rpcsec_gsserr_credproblem cpu_to_be32(RPCSEC_GSS_CREDPROBLEM)
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#define rpcsec_gsserr_ctxproblem cpu_to_be32(RPCSEC_GSS_CTXPROBLEM)
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/*
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* Miscellaneous XDR helper functions
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*/
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__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
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__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
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__be32 *xdr_encode_string(__be32 *p, const char *s);
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__be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
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unsigned int maxlen);
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__be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
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__be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
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void xdr_inline_pages(struct xdr_buf *, unsigned int,
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struct page **, unsigned int, unsigned int);
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void xdr_terminate_string(struct xdr_buf *, const u32);
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size_t xdr_buf_pagecount(struct xdr_buf *buf);
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int xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp);
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void xdr_free_bvec(struct xdr_buf *buf);
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static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
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{
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return xdr_encode_opaque(p, s, len);
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}
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/*
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* Decode 64bit quantities (NFSv3 support)
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*/
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static inline __be32 *
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xdr_encode_hyper(__be32 *p, __u64 val)
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{
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put_unaligned_be64(val, p);
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return p + 2;
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}
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static inline __be32 *
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xdr_decode_hyper(__be32 *p, __u64 *valp)
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{
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*valp = get_unaligned_be64(p);
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return p + 2;
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}
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static inline __be32 *
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xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len)
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{
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memcpy(ptr, p, len);
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return p + XDR_QUADLEN(len);
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}
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static inline void xdr_netobj_dup(struct xdr_netobj *dst,
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struct xdr_netobj *src, gfp_t gfp_mask)
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{
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dst->data = kmemdup(src->data, src->len, gfp_mask);
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dst->len = src->len;
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}
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/*
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* Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
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*/
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static inline int
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xdr_adjust_iovec(struct kvec *iov, __be32 *p)
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{
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return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
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}
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/*
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* XDR buffer helper functions
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*/
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extern void xdr_shift_buf(struct xdr_buf *, size_t);
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extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
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extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
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extern int xdr_buf_read_mic(struct xdr_buf *, struct xdr_netobj *, unsigned int);
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extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
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extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
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/*
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* Helper structure for copying from an sk_buff.
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*/
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struct xdr_skb_reader {
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struct sk_buff *skb;
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unsigned int offset;
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size_t count;
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__wsum csum;
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};
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typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len);
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extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
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extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
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extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
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struct xdr_array2_desc;
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typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
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struct xdr_array2_desc {
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unsigned int elem_size;
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unsigned int array_len;
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unsigned int array_maxlen;
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xdr_xcode_elem_t xcode;
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};
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extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
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struct xdr_array2_desc *desc);
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extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
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struct xdr_array2_desc *desc);
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extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
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size_t len);
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/*
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* Provide some simple tools for XDR buffer overflow-checking etc.
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*/
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struct xdr_stream {
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__be32 *p; /* start of available buffer */
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struct xdr_buf *buf; /* XDR buffer to read/write */
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__be32 *end; /* end of available buffer space */
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struct kvec *iov; /* pointer to the current kvec */
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struct kvec scratch; /* Scratch buffer */
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struct page **page_ptr; /* pointer to the current page */
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unsigned int nwords; /* Remaining decode buffer length */
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struct rpc_rqst *rqst; /* For debugging */
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};
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/*
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* These are the xdr_stream style generic XDR encode and decode functions.
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*/
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typedef void (*kxdreproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
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const void *obj);
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typedef int (*kxdrdproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
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void *obj);
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extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf,
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__be32 *p, struct rpc_rqst *rqst);
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extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
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extern void xdr_commit_encode(struct xdr_stream *xdr);
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extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
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extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
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extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
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unsigned int base, unsigned int len);
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extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
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extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf,
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__be32 *p, struct rpc_rqst *rqst);
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extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
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struct page **pages, unsigned int len);
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extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen);
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extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
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extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
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extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
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extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
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/**
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* xdr_stream_remaining - Return the number of bytes remaining in the stream
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* @xdr: pointer to struct xdr_stream
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*
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* Return value:
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* Number of bytes remaining in @xdr before xdr->end
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*/
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static inline size_t
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xdr_stream_remaining(const struct xdr_stream *xdr)
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{
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return xdr->nwords << 2;
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}
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ssize_t xdr_stream_decode_opaque(struct xdr_stream *xdr, void *ptr,
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size_t size);
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ssize_t xdr_stream_decode_opaque_dup(struct xdr_stream *xdr, void **ptr,
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size_t maxlen, gfp_t gfp_flags);
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ssize_t xdr_stream_decode_string(struct xdr_stream *xdr, char *str,
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size_t size);
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ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
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size_t maxlen, gfp_t gfp_flags);
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/**
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* xdr_align_size - Calculate padded size of an object
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* @n: Size of an object being XDR encoded (in bytes)
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*
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* Return value:
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* Size (in bytes) of the object including xdr padding
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*/
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static inline size_t
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xdr_align_size(size_t n)
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{
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const size_t mask = sizeof(__u32) - 1;
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return (n + mask) & ~mask;
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}
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/**
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* xdr_stream_encode_u32 - Encode a 32-bit integer
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* @xdr: pointer to xdr_stream
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* @n: integer to encode
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*
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* Return values:
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* On success, returns length in bytes of XDR buffer consumed
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* %-EMSGSIZE on XDR buffer overflow
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*/
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static inline ssize_t
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xdr_stream_encode_u32(struct xdr_stream *xdr, __u32 n)
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{
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const size_t len = sizeof(n);
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__be32 *p = xdr_reserve_space(xdr, len);
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if (unlikely(!p))
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return -EMSGSIZE;
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*p = cpu_to_be32(n);
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return len;
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}
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/**
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* xdr_stream_encode_u64 - Encode a 64-bit integer
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* @xdr: pointer to xdr_stream
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* @n: 64-bit integer to encode
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*
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* Return values:
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* On success, returns length in bytes of XDR buffer consumed
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* %-EMSGSIZE on XDR buffer overflow
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*/
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static inline ssize_t
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xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n)
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{
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const size_t len = sizeof(n);
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__be32 *p = xdr_reserve_space(xdr, len);
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if (unlikely(!p))
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return -EMSGSIZE;
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xdr_encode_hyper(p, n);
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return len;
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}
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/**
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* xdr_stream_encode_opaque_inline - Encode opaque xdr data
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* @xdr: pointer to xdr_stream
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* @ptr: pointer to void pointer
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* @len: size of object
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*
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* Return values:
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* On success, returns length in bytes of XDR buffer consumed
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* %-EMSGSIZE on XDR buffer overflow
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*/
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static inline ssize_t
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xdr_stream_encode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t len)
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{
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size_t count = sizeof(__u32) + xdr_align_size(len);
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__be32 *p = xdr_reserve_space(xdr, count);
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if (unlikely(!p)) {
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*ptr = NULL;
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return -EMSGSIZE;
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}
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xdr_encode_opaque(p, NULL, len);
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*ptr = ++p;
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return count;
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}
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/**
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* xdr_stream_encode_opaque_fixed - Encode fixed length opaque xdr data
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* @xdr: pointer to xdr_stream
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* @ptr: pointer to opaque data object
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* @len: size of object pointed to by @ptr
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*
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* Return values:
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* On success, returns length in bytes of XDR buffer consumed
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* %-EMSGSIZE on XDR buffer overflow
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*/
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static inline ssize_t
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xdr_stream_encode_opaque_fixed(struct xdr_stream *xdr, const void *ptr, size_t len)
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{
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__be32 *p = xdr_reserve_space(xdr, len);
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if (unlikely(!p))
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return -EMSGSIZE;
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xdr_encode_opaque_fixed(p, ptr, len);
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return xdr_align_size(len);
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}
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/**
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* xdr_stream_encode_opaque - Encode variable length opaque xdr data
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* @xdr: pointer to xdr_stream
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* @ptr: pointer to opaque data object
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* @len: size of object pointed to by @ptr
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*
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* Return values:
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* On success, returns length in bytes of XDR buffer consumed
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* %-EMSGSIZE on XDR buffer overflow
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*/
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static inline ssize_t
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xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len)
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{
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size_t count = sizeof(__u32) + xdr_align_size(len);
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__be32 *p = xdr_reserve_space(xdr, count);
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if (unlikely(!p))
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return -EMSGSIZE;
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xdr_encode_opaque(p, ptr, len);
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return count;
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}
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/**
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* xdr_stream_encode_uint32_array - Encode variable length array of integers
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* @xdr: pointer to xdr_stream
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* @array: array of integers
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* @array_size: number of elements in @array
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*
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* Return values:
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* On success, returns length in bytes of XDR buffer consumed
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* %-EMSGSIZE on XDR buffer overflow
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*/
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static inline ssize_t
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xdr_stream_encode_uint32_array(struct xdr_stream *xdr,
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const __u32 *array, size_t array_size)
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{
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ssize_t ret = (array_size+1) * sizeof(__u32);
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__be32 *p = xdr_reserve_space(xdr, ret);
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if (unlikely(!p))
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return -EMSGSIZE;
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*p++ = cpu_to_be32(array_size);
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for (; array_size > 0; p++, array++, array_size--)
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*p = cpu_to_be32p(array);
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return ret;
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}
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/**
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* xdr_stream_decode_u32 - Decode a 32-bit integer
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* @xdr: pointer to xdr_stream
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* @ptr: location to store integer
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*
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* Return values:
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* %0 on success
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* %-EBADMSG on XDR buffer overflow
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*/
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static inline ssize_t
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xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr)
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{
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const size_t count = sizeof(*ptr);
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__be32 *p = xdr_inline_decode(xdr, count);
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if (unlikely(!p))
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return -EBADMSG;
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*ptr = be32_to_cpup(p);
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return 0;
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}
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/**
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* xdr_stream_decode_opaque_fixed - Decode fixed length opaque xdr data
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|
* @xdr: pointer to xdr_stream
|
|
* @ptr: location to store data
|
|
* @len: size of buffer pointed to by @ptr
|
|
*
|
|
* Return values:
|
|
* On success, returns size of object stored in @ptr
|
|
* %-EBADMSG on XDR buffer overflow
|
|
*/
|
|
static inline ssize_t
|
|
xdr_stream_decode_opaque_fixed(struct xdr_stream *xdr, void *ptr, size_t len)
|
|
{
|
|
__be32 *p = xdr_inline_decode(xdr, len);
|
|
|
|
if (unlikely(!p))
|
|
return -EBADMSG;
|
|
xdr_decode_opaque_fixed(p, ptr, len);
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* xdr_stream_decode_opaque_inline - Decode variable length opaque xdr data
|
|
* @xdr: pointer to xdr_stream
|
|
* @ptr: location to store pointer to opaque data
|
|
* @maxlen: maximum acceptable object size
|
|
*
|
|
* Note: the pointer stored in @ptr cannot be assumed valid after the XDR
|
|
* buffer has been destroyed, or even after calling xdr_inline_decode()
|
|
* on @xdr. It is therefore expected that the object it points to should
|
|
* be processed immediately.
|
|
*
|
|
* Return values:
|
|
* On success, returns size of object stored in *@ptr
|
|
* %-EBADMSG on XDR buffer overflow
|
|
* %-EMSGSIZE if the size of the object would exceed @maxlen
|
|
*/
|
|
static inline ssize_t
|
|
xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxlen)
|
|
{
|
|
__be32 *p;
|
|
__u32 len;
|
|
|
|
*ptr = NULL;
|
|
if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
|
|
return -EBADMSG;
|
|
if (len != 0) {
|
|
p = xdr_inline_decode(xdr, len);
|
|
if (unlikely(!p))
|
|
return -EBADMSG;
|
|
if (unlikely(len > maxlen))
|
|
return -EMSGSIZE;
|
|
*ptr = p;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* xdr_stream_decode_uint32_array - Decode variable length array of integers
|
|
* @xdr: pointer to xdr_stream
|
|
* @array: location to store the integer array or NULL
|
|
* @array_size: number of elements to store
|
|
*
|
|
* Return values:
|
|
* On success, returns number of elements stored in @array
|
|
* %-EBADMSG on XDR buffer overflow
|
|
* %-EMSGSIZE if the size of the array exceeds @array_size
|
|
*/
|
|
static inline ssize_t
|
|
xdr_stream_decode_uint32_array(struct xdr_stream *xdr,
|
|
__u32 *array, size_t array_size)
|
|
{
|
|
__be32 *p;
|
|
__u32 len;
|
|
ssize_t retval;
|
|
|
|
if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
|
|
return -EBADMSG;
|
|
p = xdr_inline_decode(xdr, len * sizeof(*p));
|
|
if (unlikely(!p))
|
|
return -EBADMSG;
|
|
if (array == NULL)
|
|
return len;
|
|
if (len <= array_size) {
|
|
if (len < array_size)
|
|
memset(array+len, 0, (array_size-len)*sizeof(*array));
|
|
array_size = len;
|
|
retval = len;
|
|
} else
|
|
retval = -EMSGSIZE;
|
|
for (; array_size > 0; p++, array++, array_size--)
|
|
*array = be32_to_cpup(p);
|
|
return retval;
|
|
}
|
|
|
|
#endif /* _SUNRPC_XDR_H_ */
|