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716 lines
20 KiB
716 lines
20 KiB
/* 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 <[email protected]> |
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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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|
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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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* Size of an XDR encoding unit in bytes, i.e. 32 bits, |
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* as defined in Section 3 of RFC 4506. All encoded |
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* XDR data items are aligned on a boundary of 32 bits. |
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*/ |
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#define XDR_UNIT sizeof(__be32) |
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|
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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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/* |
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* Generic opaque `network object.' |
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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(const struct xdr_buf *, const u32); |
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size_t xdr_buf_pagecount(const 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(const struct kvec *, struct xdr_buf *); |
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extern int xdr_buf_subsegment(const struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int); |
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extern void xdr_buf_trim(struct xdr_buf *, unsigned int); |
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extern int read_bytes_from_xdr_buf(const struct xdr_buf *, unsigned int, void *, unsigned int); |
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extern int write_bytes_to_xdr_buf(const struct xdr_buf *, unsigned int, void *, unsigned int); |
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extern int xdr_encode_word(const struct xdr_buf *, unsigned int, u32); |
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extern int xdr_decode_word(const 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(const 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(const 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 int xdr_reserve_space_vec(struct xdr_stream *xdr, struct kvec *vec, |
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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 unsigned int xdr_page_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 __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(const struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data); |
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extern unsigned int xdr_align_data(struct xdr_stream *, unsigned int offset, unsigned int length); |
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extern unsigned int xdr_expand_hole(struct xdr_stream *, unsigned int offset, unsigned int length); |
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extern bool xdr_stream_subsegment(struct xdr_stream *xdr, struct xdr_buf *subbuf, |
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unsigned int len); |
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/** |
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* xdr_set_scratch_buffer - Attach a scratch buffer for decoding data. |
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* @xdr: pointer to xdr_stream struct |
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* @buf: pointer to an empty buffer |
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* @buflen: size of 'buf' |
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* |
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* The scratch buffer is used when decoding from an array of pages. |
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* If an xdr_inline_decode() call spans across page boundaries, then |
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* we copy the data into the scratch buffer in order to allow linear |
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* access. |
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*/ |
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static inline void |
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xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen) |
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{ |
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xdr->scratch.iov_base = buf; |
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xdr->scratch.iov_len = buflen; |
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} |
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/** |
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* xdr_set_scratch_page - Attach a scratch buffer for decoding data |
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* @xdr: pointer to xdr_stream struct |
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* @page: an anonymous page |
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* |
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* See xdr_set_scratch_buffer(). |
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*/ |
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static inline void |
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xdr_set_scratch_page(struct xdr_stream *xdr, struct page *page) |
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{ |
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xdr_set_scratch_buffer(xdr, page_address(page), PAGE_SIZE); |
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} |
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/** |
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* xdr_reset_scratch_buffer - Clear scratch buffer information |
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* @xdr: pointer to xdr_stream struct |
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* |
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* See xdr_set_scratch_buffer(). |
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*/ |
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static inline void |
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xdr_reset_scratch_buffer(struct xdr_stream *xdr) |
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{ |
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xdr_set_scratch_buffer(xdr, NULL, 0); |
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} |
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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 = XDR_UNIT - 1; |
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return (n + mask) & ~mask; |
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} |
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/** |
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* xdr_pad_size - Calculate size of an object's pad |
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* @n: Size of an object being XDR encoded (in bytes) |
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* |
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* This implementation avoids the need for conditional |
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* branches or modulo division. |
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* |
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* Return value: |
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* Size (in bytes) of the needed XDR pad |
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*/ |
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static inline size_t xdr_pad_size(size_t n) |
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{ |
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return xdr_align_size(n) - n; |
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} |
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/** |
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* xdr_stream_encode_item_present - Encode a "present" list item |
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* @xdr: pointer to xdr_stream |
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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 xdr_stream_encode_item_present(struct xdr_stream *xdr) |
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{ |
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const size_t len = XDR_UNIT; |
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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 = xdr_one; |
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return len; |
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} |
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/** |
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* xdr_stream_encode_item_absent - Encode a "not present" list item |
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* @xdr: pointer to xdr_stream |
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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 int xdr_stream_encode_item_absent(struct xdr_stream *xdr) |
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{ |
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const size_t len = XDR_UNIT; |
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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 = xdr_zero; |
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return len; |
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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 |
|
* %-EMSGSIZE on XDR buffer overflow |
|
*/ |
|
static inline ssize_t |
|
xdr_stream_encode_uint32_array(struct xdr_stream *xdr, |
|
const __u32 *array, size_t array_size) |
|
{ |
|
ssize_t ret = (array_size+1) * sizeof(__u32); |
|
__be32 *p = xdr_reserve_space(xdr, ret); |
|
|
|
if (unlikely(!p)) |
|
return -EMSGSIZE; |
|
*p++ = cpu_to_be32(array_size); |
|
for (; array_size > 0; p++, array++, array_size--) |
|
*p = cpu_to_be32p(array); |
|
return ret; |
|
} |
|
|
|
/** |
|
* xdr_item_is_absent - symbolically handle XDR discriminators |
|
* @p: pointer to undecoded discriminator |
|
* |
|
* Return values: |
|
* %true if the following XDR item is absent |
|
* %false if the following XDR item is present |
|
*/ |
|
static inline bool xdr_item_is_absent(const __be32 *p) |
|
{ |
|
return *p == xdr_zero; |
|
} |
|
|
|
/** |
|
* xdr_item_is_present - symbolically handle XDR discriminators |
|
* @p: pointer to undecoded discriminator |
|
* |
|
* Return values: |
|
* %true if the following XDR item is present |
|
* %false if the following XDR item is absent |
|
*/ |
|
static inline bool xdr_item_is_present(const __be32 *p) |
|
{ |
|
return *p != xdr_zero; |
|
} |
|
|
|
/** |
|
* xdr_stream_decode_bool - Decode a boolean |
|
* @xdr: pointer to xdr_stream |
|
* @ptr: pointer to a u32 in which to store the result |
|
* |
|
* Return values: |
|
* %0 on success |
|
* %-EBADMSG on XDR buffer overflow |
|
*/ |
|
static inline ssize_t |
|
xdr_stream_decode_bool(struct xdr_stream *xdr, __u32 *ptr) |
|
{ |
|
const size_t count = sizeof(*ptr); |
|
__be32 *p = xdr_inline_decode(xdr, count); |
|
|
|
if (unlikely(!p)) |
|
return -EBADMSG; |
|
*ptr = (*p != xdr_zero); |
|
return 0; |
|
} |
|
|
|
/** |
|
* xdr_stream_decode_u32 - Decode a 32-bit integer |
|
* @xdr: pointer to xdr_stream |
|
* @ptr: location to store integer |
|
* |
|
* Return values: |
|
* %0 on success |
|
* %-EBADMSG on XDR buffer overflow |
|
*/ |
|
static inline ssize_t |
|
xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr) |
|
{ |
|
const size_t count = sizeof(*ptr); |
|
__be32 *p = xdr_inline_decode(xdr, count); |
|
|
|
if (unlikely(!p)) |
|
return -EBADMSG; |
|
*ptr = be32_to_cpup(p); |
|
return 0; |
|
} |
|
|
|
/** |
|
* xdr_stream_decode_u64 - Decode a 64-bit integer |
|
* @xdr: pointer to xdr_stream |
|
* @ptr: location to store 64-bit integer |
|
* |
|
* Return values: |
|
* %0 on success |
|
* %-EBADMSG on XDR buffer overflow |
|
*/ |
|
static inline ssize_t |
|
xdr_stream_decode_u64(struct xdr_stream *xdr, __u64 *ptr) |
|
{ |
|
const size_t count = sizeof(*ptr); |
|
__be32 *p = xdr_inline_decode(xdr, count); |
|
|
|
if (unlikely(!p)) |
|
return -EBADMSG; |
|
xdr_decode_hyper(p, ptr); |
|
return 0; |
|
} |
|
|
|
/** |
|
* xdr_stream_decode_opaque_fixed - Decode fixed length opaque xdr data |
|
* @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_ */
|
|
|