include/linux/sunrpc/xdr.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * XDR standard data types and function declarations
   4  *
   5  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   6  *
   7  * Based on:
   8  *   RFC 4506 "XDR: External Data Representation Standard", May 2006
   9  */
  10
  11 #ifndef _SUNRPC_XDR_H_
  12 #define _SUNRPC_XDR_H_
  13
  14 #include <linux/uio.h>
  15 #include <asm/byteorder.h>
  16 #include <asm/unaligned.h>
  17 #include <linux/scatterlist.h>
  18
  19 struct bio_vec;
  20 struct rpc_rqst;
  21
  22 /*
  23  * Buffer adjustment
  24  */
  25 #define XDR_QUADLEN(l)          (((l) + 3) >> 2)
  26
  27 /*
  28  * Generic opaque `network object.' At the kernel level, this type
  29  * is used only by lockd.
  30  */
  31 #define XDR_MAX_NETOBJ          1024
  32 struct xdr_netobj {
  33         unsigned int            len;
  34         u8 *                    data;
  35 };
  36
  37 /*
  38  * Basic structure for transmission/reception of a client XDR message.
  39  * Features a header (for a linear buffer containing RPC headers
  40  * and the data payload for short messages), and then an array of
  41  * pages.
  42  * The tail iovec allows you to append data after the page array. Its
  43  * main interest is for appending padding to the pages in order to
  44  * satisfy the int_32-alignment requirements in RFC1832.
  45  *
  46  * For the future, we might want to string several of these together
  47  * in a list if anybody wants to make use of NFSv4 COMPOUND
  48  * operations and/or has a need for scatter/gather involving pages.
  49  */
  50 struct xdr_buf {
  51         struct kvec     head[1],        /* RPC header + non-page data */
  52                         tail[1];        /* Appended after page data */
  53
  54         struct bio_vec  *bvec;
  55         struct page **  pages;          /* Array of pages */
  56         unsigned int    page_base,      /* Start of page data */
  57                         page_len,       /* Length of page data */
  58                         flags;          /* Flags for data disposition */
  59 #define XDRBUF_READ             0x01            /* target of file read */
  60 #define XDRBUF_WRITE            0x02            /* source of file write */
  61 #define XDRBUF_SPARSE_PAGES     0x04            /* Page array is sparse */
  62
  63         unsigned int    buflen,         /* Total length of storage buffer */
  64                         len;            /* Length of XDR encoded message */
  65 };
  66
  67 static inline void
  68 xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
  69 {
  70         buf->head[0].iov_base = start;
  71         buf->head[0].iov_len = len;
  72         buf->tail[0].iov_len = 0;
  73         buf->pages = NULL;
  74         buf->page_len = 0;
  75         buf->flags = 0;
  76         buf->len = 0;
  77         buf->buflen = len;
  78 }
  79
  80 /*
  81  * pre-xdr'ed macros.
  82  */
  83
  84 #define xdr_zero        cpu_to_be32(0)
  85 #define xdr_one         cpu_to_be32(1)
  86 #define xdr_two         cpu_to_be32(2)
  87
  88 #define rpc_auth_null   cpu_to_be32(RPC_AUTH_NULL)
  89 #define rpc_auth_unix   cpu_to_be32(RPC_AUTH_UNIX)
  90 #define rpc_auth_short  cpu_to_be32(RPC_AUTH_SHORT)
  91 #define rpc_auth_gss    cpu_to_be32(RPC_AUTH_GSS)
  92
  93 #define rpc_call        cpu_to_be32(RPC_CALL)
  94 #define rpc_reply       cpu_to_be32(RPC_REPLY)
  95
  96 #define rpc_msg_accepted        cpu_to_be32(RPC_MSG_ACCEPTED)
  97
  98 #define rpc_success             cpu_to_be32(RPC_SUCCESS)
  99 #define rpc_prog_unavail        cpu_to_be32(RPC_PROG_UNAVAIL)
 100 #define rpc_prog_mismatch       cpu_to_be32(RPC_PROG_MISMATCH)
 101 #define rpc_proc_unavail        cpu_to_be32(RPC_PROC_UNAVAIL)
 102 #define rpc_garbage_args        cpu_to_be32(RPC_GARBAGE_ARGS)
 103 #define rpc_system_err          cpu_to_be32(RPC_SYSTEM_ERR)
 104 #define rpc_drop_reply          cpu_to_be32(RPC_DROP_REPLY)
 105
 106 #define rpc_mismatch            cpu_to_be32(RPC_MISMATCH)
 107 #define rpc_auth_error          cpu_to_be32(RPC_AUTH_ERROR)
 108
 109 #define rpc_auth_ok             cpu_to_be32(RPC_AUTH_OK)
 110 #define rpc_autherr_badcred     cpu_to_be32(RPC_AUTH_BADCRED)
 111 #define rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED)
 112 #define rpc_autherr_badverf     cpu_to_be32(RPC_AUTH_BADVERF)
 113 #define rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF)
 114 #define rpc_autherr_tooweak     cpu_to_be32(RPC_AUTH_TOOWEAK)
 115 #define rpcsec_gsserr_credproblem       cpu_to_be32(RPCSEC_GSS_CREDPROBLEM)
 116 #define rpcsec_gsserr_ctxproblem        cpu_to_be32(RPCSEC_GSS_CTXPROBLEM)
 117
 118 /*
 119  * Miscellaneous XDR helper functions
 120  */
 121 __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
 122 __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
 123 __be32 *xdr_encode_string(__be32 *p, const char *s);
 124 __be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
 125                         unsigned int maxlen);
 126 __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
 127 __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
 128
 129 void    xdr_inline_pages(struct xdr_buf *, unsigned int,
 130                          struct page **, unsigned int, unsigned int);
 131 void    xdr_terminate_string(struct xdr_buf *, const u32);
 132 size_t  xdr_buf_pagecount(struct xdr_buf *buf);
 133 int     xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp);
 134 void    xdr_free_bvec(struct xdr_buf *buf);
 135
 136 static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
 137 {
 138         return xdr_encode_opaque(p, s, len);
 139 }
 140
 141 /*
 142  * Decode 64bit quantities (NFSv3 support)
 143  */
 144 static inline __be32 *
 145 xdr_encode_hyper(__be32 *p, __u64 val)
 146 {
 147         put_unaligned_be64(val, p);
 148         return p + 2;
 149 }
 150
 151 static inline __be32 *
 152 xdr_decode_hyper(__be32 *p, __u64 *valp)
 153 {
 154         *valp = get_unaligned_be64(p);
 155         return p + 2;
 156 }
 157
 158 static inline __be32 *
 159 xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len)
 160 {
 161         memcpy(ptr, p, len);
 162         return p + XDR_QUADLEN(len);
 163 }
 164
 165 static inline void xdr_netobj_dup(struct xdr_netobj *dst,
 166                                   struct xdr_netobj *src, gfp_t gfp_mask)
 167 {
 168         dst->data = kmemdup(src->data, src->len, gfp_mask);
 169         dst->len = src->len;
 170 }
 171
 172 /*
 173  * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
 174  */
 175 static inline int
 176 xdr_adjust_iovec(struct kvec *iov, __be32 *p)
 177 {
 178         return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
 179 }
 180
 181 /*
 182  * XDR buffer helper functions
 183  */
 184 extern void xdr_shift_buf(struct xdr_buf *, size_t);
 185 extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
 186 extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
 187 extern void xdr_buf_trim(struct xdr_buf *, unsigned int);
 188 extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
 189 extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
 190
 191 extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
 192 extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
 193
 194 struct xdr_array2_desc;
 195 typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
 196 struct xdr_array2_desc {
 197         unsigned int elem_size;
 198         unsigned int array_len;
 199         unsigned int array_maxlen;
 200         xdr_xcode_elem_t xcode;
 201 };
 202
 203 extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
 204                              struct xdr_array2_desc *desc);
 205 extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
 206                              struct xdr_array2_desc *desc);
 207 extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
 208                              size_t len);
 209
 210 /*
 211  * Provide some simple tools for XDR buffer overflow-checking etc.
 212  */
 213 struct xdr_stream {
 214         __be32 *p;              /* start of available buffer */
 215         struct xdr_buf *buf;    /* XDR buffer to read/write */
 216
 217         __be32 *end;            /* end of available buffer space */
 218         struct kvec *iov;       /* pointer to the current kvec */
 219         struct kvec scratch;    /* Scratch buffer */
 220         struct page **page_ptr; /* pointer to the current page */
 221         unsigned int nwords;    /* Remaining decode buffer length */
 222
 223         struct rpc_rqst *rqst;  /* For debugging */
 224 };
 225
 226 /*
 227  * These are the xdr_stream style generic XDR encode and decode functions.
 228  */
 229 typedef void    (*kxdreproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
 230                 const void *obj);
 231 typedef int     (*kxdrdproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
 232                 void *obj);
 233
 234 extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf,
 235                             __be32 *p, struct rpc_rqst *rqst);
 236 extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
 237 extern void xdr_commit_encode(struct xdr_stream *xdr);
 238 extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
 239 extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
 240 extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
 241                 unsigned int base, unsigned int len);
 242 extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
 243 extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf,
 244                             __be32 *p, struct rpc_rqst *rqst);
 245 extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
 246                 struct page **pages, unsigned int len);
 247 extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen);
 248 extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
 249 extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
 250 extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
 251 extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
 252
 253 /**
 254  * xdr_stream_remaining - Return the number of bytes remaining in the stream
 255  * @xdr: pointer to struct xdr_stream
 256  *
 257  * Return value:
 258  *   Number of bytes remaining in @xdr before xdr->end
 259  */
 260 static inline size_t
 261 xdr_stream_remaining(const struct xdr_stream *xdr)
 262 {
 263         return xdr->nwords << 2;
 264 }
 265
 266 ssize_t xdr_stream_decode_opaque(struct xdr_stream *xdr, void *ptr,
 267                 size_t size);
 268 ssize_t xdr_stream_decode_opaque_dup(struct xdr_stream *xdr, void **ptr,
 269                 size_t maxlen, gfp_t gfp_flags);
 270 ssize_t xdr_stream_decode_string(struct xdr_stream *xdr, char *str,
 271                 size_t size);
 272 ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
 273                 size_t maxlen, gfp_t gfp_flags);
 274 /**
 275  * xdr_align_size - Calculate padded size of an object
 276  * @n: Size of an object being XDR encoded (in bytes)
 277  *
 278  * Return value:
 279  *   Size (in bytes) of the object including xdr padding
 280  */
 281 static inline size_t
 282 xdr_align_size(size_t n)
 283 {
 284         const size_t mask = sizeof(__u32) - 1;
 285
 286         return (n + mask) & ~mask;
 287 }
 288
 289 /**
 290  * xdr_pad_size - Calculate size of an object's pad
 291  * @n: Size of an object being XDR encoded (in bytes)
 292  *
 293  * This implementation avoids the need for conditional
 294  * branches or modulo division.
 295  *
 296  * Return value:
 297  *   Size (in bytes) of the needed XDR pad
 298  */
 299 static inline size_t xdr_pad_size(size_t n)
 300 {
 301         return xdr_align_size(n) - n;
 302 }
 303
 304 /**
 305  * xdr_stream_encode_item_present - Encode a "present" list item
 306  * @xdr: pointer to xdr_stream
 307  *
 308  * Return values:
 309  *   On success, returns length in bytes of XDR buffer consumed
 310  *   %-EMSGSIZE on XDR buffer overflow
 311  */
 312 static inline ssize_t xdr_stream_encode_item_present(struct xdr_stream *xdr)
 313 {
 314         const size_t len = sizeof(__be32);
 315         __be32 *p = xdr_reserve_space(xdr, len);
 316
 317         if (unlikely(!p))
 318                 return -EMSGSIZE;
 319         *p = xdr_one;
 320         return len;
 321 }
 322
 323 /**
 324  * xdr_stream_encode_item_absent - Encode a "not present" list item
 325  * @xdr: pointer to xdr_stream
 326  *
 327  * Return values:
 328  *   On success, returns length in bytes of XDR buffer consumed
 329  *   %-EMSGSIZE on XDR buffer overflow
 330  */
 331 static inline int xdr_stream_encode_item_absent(struct xdr_stream *xdr)
 332 {
 333         const size_t len = sizeof(__be32);
 334         __be32 *p = xdr_reserve_space(xdr, len);
 335
 336         if (unlikely(!p))
 337                 return -EMSGSIZE;
 338         *p = xdr_zero;
 339         return len;
 340 }
 341
 342 /**
 343  * xdr_stream_encode_u32 - Encode a 32-bit integer
 344  * @xdr: pointer to xdr_stream
 345  * @n: integer to encode
 346  *
 347  * Return values:
 348  *   On success, returns length in bytes of XDR buffer consumed
 349  *   %-EMSGSIZE on XDR buffer overflow
 350  */
 351 static inline ssize_t
 352 xdr_stream_encode_u32(struct xdr_stream *xdr, __u32 n)
 353 {
 354         const size_t len = sizeof(n);
 355         __be32 *p = xdr_reserve_space(xdr, len);
 356
 357         if (unlikely(!p))
 358                 return -EMSGSIZE;
 359         *p = cpu_to_be32(n);
 360         return len;
 361 }
 362
 363 /**
 364  * xdr_stream_encode_u64 - Encode a 64-bit integer
 365  * @xdr: pointer to xdr_stream
 366  * @n: 64-bit integer to encode
 367  *
 368  * Return values:
 369  *   On success, returns length in bytes of XDR buffer consumed
 370  *   %-EMSGSIZE on XDR buffer overflow
 371  */
 372 static inline ssize_t
 373 xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n)
 374 {
 375         const size_t len = sizeof(n);
 376         __be32 *p = xdr_reserve_space(xdr, len);
 377
 378         if (unlikely(!p))
 379                 return -EMSGSIZE;
 380         xdr_encode_hyper(p, n);
 381         return len;
 382 }
 383
 384 /**
 385  * xdr_stream_encode_opaque_inline - Encode opaque xdr data
 386  * @xdr: pointer to xdr_stream
 387  * @ptr: pointer to void pointer
 388  * @len: size of object
 389  *
 390  * Return values:
 391  *   On success, returns length in bytes of XDR buffer consumed
 392  *   %-EMSGSIZE on XDR buffer overflow
 393  */
 394 static inline ssize_t
 395 xdr_stream_encode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t len)
 396 {
 397         size_t count = sizeof(__u32) + xdr_align_size(len);
 398         __be32 *p = xdr_reserve_space(xdr, count);
 399
 400         if (unlikely(!p)) {
 401                 *ptr = NULL;
 402                 return -EMSGSIZE;
 403         }
 404         xdr_encode_opaque(p, NULL, len);
 405         *ptr = ++p;
 406         return count;
 407 }
 408
 409 /**
 410  * xdr_stream_encode_opaque_fixed - Encode fixed length opaque xdr data
 411  * @xdr: pointer to xdr_stream
 412  * @ptr: pointer to opaque data object
 413  * @len: size of object pointed to by @ptr
 414  *
 415  * Return values:
 416  *   On success, returns length in bytes of XDR buffer consumed
 417  *   %-EMSGSIZE on XDR buffer overflow
 418  */
 419 static inline ssize_t
 420 xdr_stream_encode_opaque_fixed(struct xdr_stream *xdr, const void *ptr, size_t len)
 421 {
 422         __be32 *p = xdr_reserve_space(xdr, len);
 423
 424         if (unlikely(!p))
 425                 return -EMSGSIZE;
 426         xdr_encode_opaque_fixed(p, ptr, len);
 427         return xdr_align_size(len);
 428 }
 429
 430 /**
 431  * xdr_stream_encode_opaque - Encode variable length opaque xdr data
 432  * @xdr: pointer to xdr_stream
 433  * @ptr: pointer to opaque data object
 434  * @len: size of object pointed to by @ptr
 435  *
 436  * Return values:
 437  *   On success, returns length in bytes of XDR buffer consumed
 438  *   %-EMSGSIZE on XDR buffer overflow
 439  */
 440 static inline ssize_t
 441 xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len)
 442 {
 443         size_t count = sizeof(__u32) + xdr_align_size(len);
 444         __be32 *p = xdr_reserve_space(xdr, count);
 445
 446         if (unlikely(!p))
 447                 return -EMSGSIZE;
 448         xdr_encode_opaque(p, ptr, len);
 449         return count;
 450 }
 451
 452 /**
 453  * xdr_stream_encode_uint32_array - Encode variable length array of integers
 454  * @xdr: pointer to xdr_stream
 455  * @array: array of integers
 456  * @array_size: number of elements in @array
 457  *
 458  * Return values:
 459  *   On success, returns length in bytes of XDR buffer consumed
 460  *   %-EMSGSIZE on XDR buffer overflow
 461  */
 462 static inline ssize_t
 463 xdr_stream_encode_uint32_array(struct xdr_stream *xdr,
 464                 const __u32 *array, size_t array_size)
 465 {
 466         ssize_t ret = (array_size+1) * sizeof(__u32);
 467         __be32 *p = xdr_reserve_space(xdr, ret);
 468
 469         if (unlikely(!p))
 470                 return -EMSGSIZE;
 471         *p++ = cpu_to_be32(array_size);
 472         for (; array_size > 0; p++, array++, array_size--)
 473                 *p = cpu_to_be32p(array);
 474         return ret;
 475 }
 476
 477 /**
 478  * xdr_stream_decode_u32 - Decode a 32-bit integer
 479  * @xdr: pointer to xdr_stream
 480  * @ptr: location to store integer
 481  *
 482  * Return values:
 483  *   %0 on success
 484  *   %-EBADMSG on XDR buffer overflow
 485  */
 486 static inline ssize_t
 487 xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr)
 488 {
 489         const size_t count = sizeof(*ptr);
 490         __be32 *p = xdr_inline_decode(xdr, count);
 491
 492         if (unlikely(!p))
 493                 return -EBADMSG;
 494         *ptr = be32_to_cpup(p);
 495         return 0;
 496 }
 497
 498 /**
 499  * xdr_stream_decode_opaque_fixed - Decode fixed length opaque xdr data
 500  * @xdr: pointer to xdr_stream
 501  * @ptr: location to store data
 502  * @len: size of buffer pointed to by @ptr
 503  *
 504  * Return values:
 505  *   On success, returns size of object stored in @ptr
 506  *   %-EBADMSG on XDR buffer overflow
 507  */
 508 static inline ssize_t
 509 xdr_stream_decode_opaque_fixed(struct xdr_stream *xdr, void *ptr, size_t len)
 510 {
 511         __be32 *p = xdr_inline_decode(xdr, len);
 512
 513         if (unlikely(!p))
 514                 return -EBADMSG;
 515         xdr_decode_opaque_fixed(p, ptr, len);
 516         return len;
 517 }
 518
 519 /**
 520  * xdr_stream_decode_opaque_inline - Decode variable length opaque xdr data
 521  * @xdr: pointer to xdr_stream
 522  * @ptr: location to store pointer to opaque data
 523  * @maxlen: maximum acceptable object size
 524  *
 525  * Note: the pointer stored in @ptr cannot be assumed valid after the XDR
 526  * buffer has been destroyed, or even after calling xdr_inline_decode()
 527  * on @xdr. It is therefore expected that the object it points to should
 528  * be processed immediately.
 529  *
 530  * Return values:
 531  *   On success, returns size of object stored in *@ptr
 532  *   %-EBADMSG on XDR buffer overflow
 533  *   %-EMSGSIZE if the size of the object would exceed @maxlen
 534  */
 535 static inline ssize_t
 536 xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxlen)
 537 {
 538         __be32 *p;
 539         __u32 len;
 540
 541         *ptr = NULL;
 542         if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
 543                 return -EBADMSG;
 544         if (len != 0) {
 545                 p = xdr_inline_decode(xdr, len);
 546                 if (unlikely(!p))
 547                         return -EBADMSG;
 548                 if (unlikely(len > maxlen))
 549                         return -EMSGSIZE;
 550                 *ptr = p;
 551         }
 552         return len;
 553 }
 554
 555 /**
 556  * xdr_stream_decode_uint32_array - Decode variable length array of integers
 557  * @xdr: pointer to xdr_stream
 558  * @array: location to store the integer array or NULL
 559  * @array_size: number of elements to store
 560  *
 561  * Return values:
 562  *   On success, returns number of elements stored in @array
 563  *   %-EBADMSG on XDR buffer overflow
 564  *   %-EMSGSIZE if the size of the array exceeds @array_size
 565  */
 566 static inline ssize_t
 567 xdr_stream_decode_uint32_array(struct xdr_stream *xdr,
 568                 __u32 *array, size_t array_size)
 569 {
 570         __be32 *p;
 571         __u32 len;
 572         ssize_t retval;
 573
 574         if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
 575                 return -EBADMSG;
 576         p = xdr_inline_decode(xdr, len * sizeof(*p));
 577         if (unlikely(!p))
 578                 return -EBADMSG;
 579         if (array == NULL)
 580                 return len;
 581         if (len <= array_size) {
 582                 if (len < array_size)
 583                         memset(array+len, 0, (array_size-len)*sizeof(*array));
 584                 array_size = len;
 585                 retval = len;
 586         } else
 587                 retval = -EMSGSIZE;
 588         for (; array_size > 0; p++, array++, array_size--)
 589                 *array = be32_to_cpup(p);
 590         return retval;
 591 }
 592
 593 #endif /* _SUNRPC_XDR_H_ */