fs/nfs/nfs42xdr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2014 Anna Schumaker <[email protected]>
   4  */
   5 #ifndef __LINUX_FS_NFS_NFS4_2XDR_H
   6 #define __LINUX_FS_NFS_NFS4_2XDR_H
   7
   8 #include "nfs42.h"
   9
  10 /* Not limited by NFS itself, limited by the generic xattr code */
  11 #define nfs4_xattr_name_maxsz   XDR_QUADLEN(XATTR_NAME_MAX)
  12
  13 #define encode_fallocate_maxsz          (encode_stateid_maxsz + \
  14                                          2 /* offset */ + \
  15                                          2 /* length */)
  16 #define NFS42_WRITE_RES_SIZE            (1 /* wr_callback_id size */ +\
  17                                          XDR_QUADLEN(NFS4_STATEID_SIZE) + \
  18                                          2 /* wr_count */ + \
  19                                          1 /* wr_committed */ + \
  20                                          XDR_QUADLEN(NFS4_VERIFIER_SIZE))
  21 #define encode_allocate_maxsz           (op_encode_hdr_maxsz + \
  22                                          encode_fallocate_maxsz)
  23 #define decode_allocate_maxsz           (op_decode_hdr_maxsz)
  24 #define encode_copy_maxsz               (op_encode_hdr_maxsz +          \
  25                                          XDR_QUADLEN(NFS4_STATEID_SIZE) + \
  26                                          XDR_QUADLEN(NFS4_STATEID_SIZE) + \
  27                                          2 + 2 + 2 + 1 + 1 + 1 +\
  28                                          1 + /* One cnr_source_server */\
  29                                          1 + /* nl4_type */ \
  30                                          1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT))
  31 #define decode_copy_maxsz               (op_decode_hdr_maxsz + \
  32                                          NFS42_WRITE_RES_SIZE + \
  33                                          1 /* cr_consecutive */ + \
  34                                          1 /* cr_synchronous */)
  35 #define encode_offload_cancel_maxsz     (op_encode_hdr_maxsz + \
  36                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
  37 #define decode_offload_cancel_maxsz     (op_decode_hdr_maxsz)
  38 #define encode_copy_notify_maxsz        (op_encode_hdr_maxsz + \
  39                                          XDR_QUADLEN(NFS4_STATEID_SIZE) + \
  40                                          1 + /* nl4_type */ \
  41                                          1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT))
  42 #define decode_copy_notify_maxsz        (op_decode_hdr_maxsz + \
  43                                          3 + /* cnr_lease_time */\
  44                                          XDR_QUADLEN(NFS4_STATEID_SIZE) + \
  45                                          1 + /* Support 1 cnr_source_server */\
  46                                          1 + /* nl4_type */ \
  47                                          1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT))
  48 #define encode_deallocate_maxsz         (op_encode_hdr_maxsz + \
  49                                          encode_fallocate_maxsz)
  50 #define decode_deallocate_maxsz         (op_decode_hdr_maxsz)
  51 #define encode_read_plus_maxsz          (op_encode_hdr_maxsz + \
  52                                          encode_stateid_maxsz + 3)
  53 #define NFS42_READ_PLUS_DATA_SEGMENT_SIZE \
  54                                         (1 /* data_content4 */ + \
  55                                          2 /* data_info4.di_offset */ + \
  56                                          1 /* data_info4.di_length */)
  57 #define decode_read_plus_maxsz          (op_decode_hdr_maxsz + \
  58                                          1 /* rpr_eof */ + \
  59                                          1 /* rpr_contents count */ + \
  60                                          NFS42_READ_PLUS_DATA_SEGMENT_SIZE)
  61 #define encode_seek_maxsz               (op_encode_hdr_maxsz + \
  62                                          encode_stateid_maxsz + \
  63                                          2 /* offset */ + \
  64                                          1 /* whence */)
  65 #define decode_seek_maxsz               (op_decode_hdr_maxsz + \
  66                                          1 /* eof */ + \
  67                                          1 /* whence */ + \
  68                                          2 /* offset */ + \
  69                                          2 /* length */)
  70 #define encode_io_info_maxsz            4
  71 #define encode_layoutstats_maxsz        (op_decode_hdr_maxsz + \
  72                                         2 /* offset */ + \
  73                                         2 /* length */ + \
  74                                         encode_stateid_maxsz + \
  75                                         encode_io_info_maxsz + \
  76                                         encode_io_info_maxsz + \
  77                                         1 /* opaque devaddr4 length */ + \
  78                                         XDR_QUADLEN(PNFS_LAYOUTSTATS_MAXSIZE))
  79 #define decode_layoutstats_maxsz        (op_decode_hdr_maxsz)
  80 #define encode_device_error_maxsz       (XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
  81                                         1 /* status */ + 1 /* opnum */)
  82 #define encode_layouterror_maxsz        (op_decode_hdr_maxsz + \
  83                                         2 /* offset */ + \
  84                                         2 /* length */ + \
  85                                         encode_stateid_maxsz + \
  86                                         1 /* Array size */ + \
  87                                         encode_device_error_maxsz)
  88 #define decode_layouterror_maxsz        (op_decode_hdr_maxsz)
  89 #define encode_clone_maxsz              (encode_stateid_maxsz + \
  90                                         encode_stateid_maxsz + \
  91                                         2 /* src offset */ + \
  92                                         2 /* dst offset */ + \
  93                                         2 /* count */)
  94 #define decode_clone_maxsz              (op_decode_hdr_maxsz)
  95 #define encode_getxattr_maxsz           (op_encode_hdr_maxsz + 1 + \
  96                                          nfs4_xattr_name_maxsz)
  97 #define decode_getxattr_maxsz           (op_decode_hdr_maxsz + 1 + pagepad_maxsz)
  98 #define encode_setxattr_maxsz           (op_encode_hdr_maxsz + \
  99                                          1 + nfs4_xattr_name_maxsz + 1)
 100 #define decode_setxattr_maxsz           (op_decode_hdr_maxsz + decode_change_info_maxsz)
 101 #define encode_listxattrs_maxsz         (op_encode_hdr_maxsz + 2 + 1)
 102 #define decode_listxattrs_maxsz         (op_decode_hdr_maxsz + 2 + 1 + 1 + 1)
 103 #define encode_removexattr_maxsz        (op_encode_hdr_maxsz + 1 + \
 104                                          nfs4_xattr_name_maxsz)
 105 #define decode_removexattr_maxsz        (op_decode_hdr_maxsz + \
 106                                          decode_change_info_maxsz)
 107
 108 #define NFS4_enc_allocate_sz            (compound_encode_hdr_maxsz + \
 109                                          encode_sequence_maxsz + \
 110                                          encode_putfh_maxsz + \
 111                                          encode_allocate_maxsz + \
 112                                          encode_getattr_maxsz)
 113 #define NFS4_dec_allocate_sz            (compound_decode_hdr_maxsz + \
 114                                          decode_sequence_maxsz + \
 115                                          decode_putfh_maxsz + \
 116                                          decode_allocate_maxsz + \
 117                                          decode_getattr_maxsz)
 118 #define NFS4_enc_copy_sz                (compound_encode_hdr_maxsz + \
 119                                          encode_sequence_maxsz + \
 120                                          encode_putfh_maxsz + \
 121                                          encode_savefh_maxsz + \
 122                                          encode_putfh_maxsz + \
 123                                          encode_copy_maxsz + \
 124                                          encode_commit_maxsz)
 125 #define NFS4_dec_copy_sz                (compound_decode_hdr_maxsz + \
 126                                          decode_sequence_maxsz + \
 127                                          decode_putfh_maxsz + \
 128                                          decode_savefh_maxsz + \
 129                                          decode_putfh_maxsz + \
 130                                          decode_copy_maxsz + \
 131                                          decode_commit_maxsz)
 132 #define NFS4_enc_offload_cancel_sz      (compound_encode_hdr_maxsz + \
 133                                          encode_sequence_maxsz + \
 134                                          encode_putfh_maxsz + \
 135                                          encode_offload_cancel_maxsz)
 136 #define NFS4_dec_offload_cancel_sz      (compound_decode_hdr_maxsz + \
 137                                          decode_sequence_maxsz + \
 138                                          decode_putfh_maxsz + \
 139                                          decode_offload_cancel_maxsz)
 140 #define NFS4_enc_copy_notify_sz         (compound_encode_hdr_maxsz + \
 141                                          encode_putfh_maxsz + \
 142                                          encode_copy_notify_maxsz)
 143 #define NFS4_dec_copy_notify_sz         (compound_decode_hdr_maxsz + \
 144                                          decode_putfh_maxsz + \
 145                                          decode_copy_notify_maxsz)
 146 #define NFS4_enc_deallocate_sz          (compound_encode_hdr_maxsz + \
 147                                          encode_sequence_maxsz + \
 148                                          encode_putfh_maxsz + \
 149                                          encode_deallocate_maxsz + \
 150                                          encode_getattr_maxsz)
 151 #define NFS4_dec_deallocate_sz          (compound_decode_hdr_maxsz + \
 152                                          decode_sequence_maxsz + \
 153                                          decode_putfh_maxsz + \
 154                                          decode_deallocate_maxsz + \
 155                                          decode_getattr_maxsz)
 156 #define NFS4_enc_read_plus_sz           (compound_encode_hdr_maxsz + \
 157                                          encode_sequence_maxsz + \
 158                                          encode_putfh_maxsz + \
 159                                          encode_read_plus_maxsz)
 160 #define NFS4_dec_read_plus_sz           (compound_decode_hdr_maxsz + \
 161                                          decode_sequence_maxsz + \
 162                                          decode_putfh_maxsz + \
 163                                          decode_read_plus_maxsz)
 164 #define NFS4_enc_seek_sz                (compound_encode_hdr_maxsz + \
 165                                          encode_sequence_maxsz + \
 166                                          encode_putfh_maxsz + \
 167                                          encode_seek_maxsz)
 168 #define NFS4_dec_seek_sz                (compound_decode_hdr_maxsz + \
 169                                          decode_sequence_maxsz + \
 170                                          decode_putfh_maxsz + \
 171                                          decode_seek_maxsz)
 172 #define NFS4_enc_layoutstats_sz         (compound_encode_hdr_maxsz + \
 173                                          encode_sequence_maxsz + \
 174                                          encode_putfh_maxsz + \
 175                                          PNFS_LAYOUTSTATS_MAXDEV * encode_layoutstats_maxsz)
 176 #define NFS4_dec_layoutstats_sz         (compound_decode_hdr_maxsz + \
 177                                          decode_sequence_maxsz + \
 178                                          decode_putfh_maxsz + \
 179                                          PNFS_LAYOUTSTATS_MAXDEV * decode_layoutstats_maxsz)
 180 #define NFS4_enc_layouterror_sz         (compound_encode_hdr_maxsz + \
 181                                          encode_sequence_maxsz + \
 182                                          encode_putfh_maxsz + \
 183                                          NFS42_LAYOUTERROR_MAX * \
 184                                          encode_layouterror_maxsz)
 185 #define NFS4_dec_layouterror_sz         (compound_decode_hdr_maxsz + \
 186                                          decode_sequence_maxsz + \
 187                                          decode_putfh_maxsz + \
 188                                          NFS42_LAYOUTERROR_MAX * \
 189                                          decode_layouterror_maxsz)
 190 #define NFS4_enc_clone_sz               (compound_encode_hdr_maxsz + \
 191                                          encode_sequence_maxsz + \
 192                                          encode_putfh_maxsz + \
 193                                          encode_savefh_maxsz + \
 194                                          encode_putfh_maxsz + \
 195                                          encode_clone_maxsz + \
 196                                          encode_getattr_maxsz)
 197 #define NFS4_dec_clone_sz               (compound_decode_hdr_maxsz + \
 198                                          decode_sequence_maxsz + \
 199                                          decode_putfh_maxsz + \
 200                                          decode_savefh_maxsz + \
 201                                          decode_putfh_maxsz + \
 202                                          decode_clone_maxsz + \
 203                                          decode_getattr_maxsz)
 204 #define NFS4_enc_getxattr_sz            (compound_encode_hdr_maxsz + \
 205                                          encode_sequence_maxsz + \
 206                                          encode_putfh_maxsz + \
 207                                          encode_getxattr_maxsz)
 208 #define NFS4_dec_getxattr_sz            (compound_decode_hdr_maxsz + \
 209                                          decode_sequence_maxsz + \
 210                                          decode_putfh_maxsz + \
 211                                          decode_getxattr_maxsz)
 212 #define NFS4_enc_setxattr_sz            (compound_encode_hdr_maxsz + \
 213                                          encode_sequence_maxsz + \
 214                                          encode_putfh_maxsz + \
 215                                          encode_setxattr_maxsz + \
 216                                          encode_getattr_maxsz)
 217 #define NFS4_dec_setxattr_sz            (compound_decode_hdr_maxsz + \
 218                                          decode_sequence_maxsz + \
 219                                          decode_putfh_maxsz + \
 220                                          decode_setxattr_maxsz + \
 221                                          decode_getattr_maxsz)
 222 #define NFS4_enc_listxattrs_sz          (compound_encode_hdr_maxsz + \
 223                                          encode_sequence_maxsz + \
 224                                          encode_putfh_maxsz + \
 225                                          encode_listxattrs_maxsz)
 226 #define NFS4_dec_listxattrs_sz          (compound_decode_hdr_maxsz + \
 227                                          decode_sequence_maxsz + \
 228                                          decode_putfh_maxsz + \
 229                                          decode_listxattrs_maxsz)
 230 #define NFS4_enc_removexattr_sz         (compound_encode_hdr_maxsz + \
 231                                          encode_sequence_maxsz + \
 232                                          encode_putfh_maxsz + \
 233                                          encode_removexattr_maxsz)
 234 #define NFS4_dec_removexattr_sz         (compound_decode_hdr_maxsz + \
 235                                          decode_sequence_maxsz + \
 236                                          decode_putfh_maxsz + \
 237                                          decode_removexattr_maxsz)
 238
 239 /*
 240  * These values specify the maximum amount of data that is not
 241  * associated with the extended attribute name or extended
 242  * attribute list in the SETXATTR, GETXATTR and LISTXATTR
 243  * respectively.
 244  */
 245 const u32 nfs42_maxsetxattr_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 246                                         compound_encode_hdr_maxsz +
 247                                         encode_sequence_maxsz +
 248                                         encode_putfh_maxsz + 1 +
 249                                         nfs4_xattr_name_maxsz)
 250                                         * XDR_UNIT);
 251
 252 const u32 nfs42_maxgetxattr_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 253                                         compound_decode_hdr_maxsz +
 254                                         decode_sequence_maxsz +
 255                                         decode_putfh_maxsz + 1) * XDR_UNIT);
 256
 257 const u32 nfs42_maxlistxattrs_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 258                                         compound_decode_hdr_maxsz +
 259                                         decode_sequence_maxsz +
 260                                         decode_putfh_maxsz + 3) * XDR_UNIT);
 261
 262 static void encode_fallocate(struct xdr_stream *xdr,
 263                              const struct nfs42_falloc_args *args)
 264 {
 265         encode_nfs4_stateid(xdr, &args->falloc_stateid);
 266         encode_uint64(xdr, args->falloc_offset);
 267         encode_uint64(xdr, args->falloc_length);
 268 }
 269
 270 static void encode_allocate(struct xdr_stream *xdr,
 271                             const struct nfs42_falloc_args *args,
 272                             struct compound_hdr *hdr)
 273 {
 274         encode_op_hdr(xdr, OP_ALLOCATE, decode_allocate_maxsz, hdr);
 275         encode_fallocate(xdr, args);
 276 }
 277
 278 static void encode_nl4_server(struct xdr_stream *xdr,
 279                               const struct nl4_server *ns)
 280 {
 281         encode_uint32(xdr, ns->nl4_type);
 282         switch (ns->nl4_type) {
 283         case NL4_NAME:
 284         case NL4_URL:
 285                 encode_string(xdr, ns->u.nl4_str_sz, ns->u.nl4_str);
 286                 break;
 287         case NL4_NETADDR:
 288                 encode_string(xdr, ns->u.nl4_addr.netid_len,
 289                               ns->u.nl4_addr.netid);
 290                 encode_string(xdr, ns->u.nl4_addr.addr_len,
 291                               ns->u.nl4_addr.addr);
 292                 break;
 293         default:
 294                 WARN_ON_ONCE(1);
 295         }
 296 }
 297
 298 static void encode_copy(struct xdr_stream *xdr,
 299                         const struct nfs42_copy_args *args,
 300                         struct compound_hdr *hdr)
 301 {
 302         encode_op_hdr(xdr, OP_COPY, decode_copy_maxsz, hdr);
 303         encode_nfs4_stateid(xdr, &args->src_stateid);
 304         encode_nfs4_stateid(xdr, &args->dst_stateid);
 305
 306         encode_uint64(xdr, args->src_pos);
 307         encode_uint64(xdr, args->dst_pos);
 308         encode_uint64(xdr, args->count);
 309
 310         encode_uint32(xdr, 1); /* consecutive = true */
 311         encode_uint32(xdr, args->sync);
 312         if (args->cp_src == NULL) { /* intra-ssc */
 313                 encode_uint32(xdr, 0); /* no src server list */
 314                 return;
 315         }
 316         encode_uint32(xdr, 1); /* supporting 1 server */
 317         encode_nl4_server(xdr, args->cp_src);
 318 }
 319
 320 static void encode_copy_commit(struct xdr_stream *xdr,
 321                           const struct nfs42_copy_args *args,
 322                           struct compound_hdr *hdr)
 323 {
 324         __be32 *p;
 325
 326         encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
 327         p = reserve_space(xdr, 12);
 328         p = xdr_encode_hyper(p, args->dst_pos);
 329         *p = cpu_to_be32(args->count);
 330 }
 331
 332 static void encode_offload_cancel(struct xdr_stream *xdr,
 333                                   const struct nfs42_offload_status_args *args,
 334                                   struct compound_hdr *hdr)
 335 {
 336         encode_op_hdr(xdr, OP_OFFLOAD_CANCEL, decode_offload_cancel_maxsz, hdr);
 337         encode_nfs4_stateid(xdr, &args->osa_stateid);
 338 }
 339
 340 static void encode_copy_notify(struct xdr_stream *xdr,
 341                                const struct nfs42_copy_notify_args *args,
 342                                struct compound_hdr *hdr)
 343 {
 344         encode_op_hdr(xdr, OP_COPY_NOTIFY, decode_copy_notify_maxsz, hdr);
 345         encode_nfs4_stateid(xdr, &args->cna_src_stateid);
 346         encode_nl4_server(xdr, &args->cna_dst);
 347 }
 348
 349 static void encode_deallocate(struct xdr_stream *xdr,
 350                               const struct nfs42_falloc_args *args,
 351                               struct compound_hdr *hdr)
 352 {
 353         encode_op_hdr(xdr, OP_DEALLOCATE, decode_deallocate_maxsz, hdr);
 354         encode_fallocate(xdr, args);
 355 }
 356
 357 static void encode_read_plus(struct xdr_stream *xdr,
 358                              const struct nfs_pgio_args *args,
 359                              struct compound_hdr *hdr)
 360 {
 361         encode_op_hdr(xdr, OP_READ_PLUS, decode_read_plus_maxsz, hdr);
 362         encode_nfs4_stateid(xdr, &args->stateid);
 363         encode_uint64(xdr, args->offset);
 364         encode_uint32(xdr, args->count);
 365 }
 366
 367 static void encode_seek(struct xdr_stream *xdr,
 368                         const struct nfs42_seek_args *args,
 369                         struct compound_hdr *hdr)
 370 {
 371         encode_op_hdr(xdr, OP_SEEK, decode_seek_maxsz, hdr);
 372         encode_nfs4_stateid(xdr, &args->sa_stateid);
 373         encode_uint64(xdr, args->sa_offset);
 374         encode_uint32(xdr, args->sa_what);
 375 }
 376
 377 static void encode_layoutstats(struct xdr_stream *xdr,
 378                                const struct nfs42_layoutstat_args *args,
 379                                struct nfs42_layoutstat_devinfo *devinfo,
 380                                struct compound_hdr *hdr)
 381 {
 382         __be32 *p;
 383
 384         encode_op_hdr(xdr, OP_LAYOUTSTATS, decode_layoutstats_maxsz, hdr);
 385         p = reserve_space(xdr, 8 + 8);
 386         p = xdr_encode_hyper(p, devinfo->offset);
 387         p = xdr_encode_hyper(p, devinfo->length);
 388         encode_nfs4_stateid(xdr, &args->stateid);
 389         p = reserve_space(xdr, 4*8 + NFS4_DEVICEID4_SIZE + 4);
 390         p = xdr_encode_hyper(p, devinfo->read_count);
 391         p = xdr_encode_hyper(p, devinfo->read_bytes);
 392         p = xdr_encode_hyper(p, devinfo->write_count);
 393         p = xdr_encode_hyper(p, devinfo->write_bytes);
 394         p = xdr_encode_opaque_fixed(p, devinfo->dev_id.data,
 395                         NFS4_DEVICEID4_SIZE);
 396         /* Encode layoutupdate4 */
 397         *p++ = cpu_to_be32(devinfo->layout_type);
 398         if (devinfo->ld_private.ops)
 399                 devinfo->ld_private.ops->encode(xdr, args,
 400                                 &devinfo->ld_private);
 401         else
 402                 encode_uint32(xdr, 0);
 403 }
 404
 405 static void encode_clone(struct xdr_stream *xdr,
 406                          const struct nfs42_clone_args *args,
 407                          struct compound_hdr *hdr)
 408 {
 409         __be32 *p;
 410
 411         encode_op_hdr(xdr, OP_CLONE, decode_clone_maxsz, hdr);
 412         encode_nfs4_stateid(xdr, &args->src_stateid);
 413         encode_nfs4_stateid(xdr, &args->dst_stateid);
 414         p = reserve_space(xdr, 3*8);
 415         p = xdr_encode_hyper(p, args->src_offset);
 416         p = xdr_encode_hyper(p, args->dst_offset);
 417         xdr_encode_hyper(p, args->count);
 418 }
 419
 420 static void encode_device_error(struct xdr_stream *xdr,
 421                                 const struct nfs42_device_error *error)
 422 {
 423         __be32 *p;
 424
 425         p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 2*4);
 426         p = xdr_encode_opaque_fixed(p, error->dev_id.data,
 427                         NFS4_DEVICEID4_SIZE);
 428         *p++ = cpu_to_be32(error->status);
 429         *p = cpu_to_be32(error->opnum);
 430 }
 431
 432 static void encode_layouterror(struct xdr_stream *xdr,
 433                                const struct nfs42_layout_error *args,
 434                                struct compound_hdr *hdr)
 435 {
 436         __be32 *p;
 437
 438         encode_op_hdr(xdr, OP_LAYOUTERROR, decode_layouterror_maxsz, hdr);
 439         p = reserve_space(xdr, 8 + 8);
 440         p = xdr_encode_hyper(p, args->offset);
 441         p = xdr_encode_hyper(p, args->length);
 442         encode_nfs4_stateid(xdr, &args->stateid);
 443         p = reserve_space(xdr, 4);
 444         *p = cpu_to_be32(1);
 445         encode_device_error(xdr, &args->errors[0]);
 446 }
 447
 448 static void encode_setxattr(struct xdr_stream *xdr,
 449                             const struct nfs42_setxattrargs *arg,
 450                             struct compound_hdr *hdr)
 451 {
 452         __be32 *p;
 453
 454         BUILD_BUG_ON(XATTR_CREATE != SETXATTR4_CREATE);
 455         BUILD_BUG_ON(XATTR_REPLACE != SETXATTR4_REPLACE);
 456
 457         encode_op_hdr(xdr, OP_SETXATTR, decode_setxattr_maxsz, hdr);
 458         p = reserve_space(xdr, 4);
 459         *p = cpu_to_be32(arg->xattr_flags);
 460         encode_string(xdr, strlen(arg->xattr_name), arg->xattr_name);
 461         p = reserve_space(xdr, 4);
 462         *p = cpu_to_be32(arg->xattr_len);
 463         if (arg->xattr_len)
 464                 xdr_write_pages(xdr, arg->xattr_pages, 0, arg->xattr_len);
 465 }
 466
 467 static void encode_getxattr(struct xdr_stream *xdr, const char *name,
 468                             struct compound_hdr *hdr)
 469 {
 470         encode_op_hdr(xdr, OP_GETXATTR, decode_getxattr_maxsz, hdr);
 471         encode_string(xdr, strlen(name), name);
 472 }
 473
 474 static void encode_removexattr(struct xdr_stream *xdr, const char *name,
 475                                struct compound_hdr *hdr)
 476 {
 477         encode_op_hdr(xdr, OP_REMOVEXATTR, decode_removexattr_maxsz, hdr);
 478         encode_string(xdr, strlen(name), name);
 479 }
 480
 481 static void encode_listxattrs(struct xdr_stream *xdr,
 482                              const struct nfs42_listxattrsargs *arg,
 483                              struct compound_hdr *hdr)
 484 {
 485         __be32 *p;
 486
 487         encode_op_hdr(xdr, OP_LISTXATTRS, decode_listxattrs_maxsz, hdr);
 488
 489         p = reserve_space(xdr, 12);
 490         if (unlikely(!p))
 491                 return;
 492
 493         p = xdr_encode_hyper(p, arg->cookie);
 494         /*
 495          * RFC 8276 says to specify the full max length of the LISTXATTRS
 496          * XDR reply. Count is set to the XDR length of the names array
 497          * plus the EOF marker. So, add the cookie and the names count.
 498          */
 499         *p = cpu_to_be32(arg->count + 8 + 4);
 500 }
 501
 502 /*
 503  * Encode ALLOCATE request
 504  */
 505 static void nfs4_xdr_enc_allocate(struct rpc_rqst *req,
 506                                   struct xdr_stream *xdr,
 507                                   const void *data)
 508 {
 509         const struct nfs42_falloc_args *args = data;
 510         struct compound_hdr hdr = {
 511                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 512         };
 513
 514         encode_compound_hdr(xdr, req, &hdr);
 515         encode_sequence(xdr, &args->seq_args, &hdr);
 516         encode_putfh(xdr, args->falloc_fh, &hdr);
 517         encode_allocate(xdr, args, &hdr);
 518         encode_getfattr(xdr, args->falloc_bitmask, &hdr);
 519         encode_nops(&hdr);
 520 }
 521
 522 /*
 523  * Encode COPY request
 524  */
 525 static void nfs4_xdr_enc_copy(struct rpc_rqst *req,
 526                               struct xdr_stream *xdr,
 527                               const void *data)
 528 {
 529         const struct nfs42_copy_args *args = data;
 530         struct compound_hdr hdr = {
 531                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 532         };
 533
 534         encode_compound_hdr(xdr, req, &hdr);
 535         encode_sequence(xdr, &args->seq_args, &hdr);
 536         encode_putfh(xdr, args->src_fh, &hdr);
 537         encode_savefh(xdr, &hdr);
 538         encode_putfh(xdr, args->dst_fh, &hdr);
 539         encode_copy(xdr, args, &hdr);
 540         if (args->sync)
 541                 encode_copy_commit(xdr, args, &hdr);
 542         encode_nops(&hdr);
 543 }
 544
 545 /*
 546  * Encode OFFLOAD_CANEL request
 547  */
 548 static void nfs4_xdr_enc_offload_cancel(struct rpc_rqst *req,
 549                                         struct xdr_stream *xdr,
 550                                         const void *data)
 551 {
 552         const struct nfs42_offload_status_args *args = data;
 553         struct compound_hdr hdr = {
 554                 .minorversion = nfs4_xdr_minorversion(&args->osa_seq_args),
 555         };
 556
 557         encode_compound_hdr(xdr, req, &hdr);
 558         encode_sequence(xdr, &args->osa_seq_args, &hdr);
 559         encode_putfh(xdr, args->osa_src_fh, &hdr);
 560         encode_offload_cancel(xdr, args, &hdr);
 561         encode_nops(&hdr);
 562 }
 563
 564 /*
 565  * Encode COPY_NOTIFY request
 566  */
 567 static void nfs4_xdr_enc_copy_notify(struct rpc_rqst *req,
 568                                      struct xdr_stream *xdr,
 569                                      const void *data)
 570 {
 571         const struct nfs42_copy_notify_args *args = data;
 572         struct compound_hdr hdr = {
 573                 .minorversion = nfs4_xdr_minorversion(&args->cna_seq_args),
 574         };
 575
 576         encode_compound_hdr(xdr, req, &hdr);
 577         encode_sequence(xdr, &args->cna_seq_args, &hdr);
 578         encode_putfh(xdr, args->cna_src_fh, &hdr);
 579         encode_copy_notify(xdr, args, &hdr);
 580         encode_nops(&hdr);
 581 }
 582
 583 /*
 584  * Encode DEALLOCATE request
 585  */
 586 static void nfs4_xdr_enc_deallocate(struct rpc_rqst *req,
 587                                     struct xdr_stream *xdr,
 588                                     const void *data)
 589 {
 590         const struct nfs42_falloc_args *args = data;
 591         struct compound_hdr hdr = {
 592                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 593         };
 594
 595         encode_compound_hdr(xdr, req, &hdr);
 596         encode_sequence(xdr, &args->seq_args, &hdr);
 597         encode_putfh(xdr, args->falloc_fh, &hdr);
 598         encode_deallocate(xdr, args, &hdr);
 599         encode_getfattr(xdr, args->falloc_bitmask, &hdr);
 600         encode_nops(&hdr);
 601 }
 602
 603 /*
 604  * Encode READ_PLUS request
 605  */
 606 static void nfs4_xdr_enc_read_plus(struct rpc_rqst *req,
 607                                    struct xdr_stream *xdr,
 608                                    const void *data)
 609 {
 610         const struct nfs_pgio_args *args = data;
 611         struct compound_hdr hdr = {
 612                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 613         };
 614
 615         encode_compound_hdr(xdr, req, &hdr);
 616         encode_sequence(xdr, &args->seq_args, &hdr);
 617         encode_putfh(xdr, args->fh, &hdr);
 618         encode_read_plus(xdr, args, &hdr);
 619
 620         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
 621                                 args->count, hdr.replen);
 622         encode_nops(&hdr);
 623 }
 624
 625 /*
 626  * Encode SEEK request
 627  */
 628 static void nfs4_xdr_enc_seek(struct rpc_rqst *req,
 629                               struct xdr_stream *xdr,
 630                               const void *data)
 631 {
 632         const struct nfs42_seek_args *args = data;
 633         struct compound_hdr hdr = {
 634                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 635         };
 636
 637         encode_compound_hdr(xdr, req, &hdr);
 638         encode_sequence(xdr, &args->seq_args, &hdr);
 639         encode_putfh(xdr, args->sa_fh, &hdr);
 640         encode_seek(xdr, args, &hdr);
 641         encode_nops(&hdr);
 642 }
 643
 644 /*
 645  * Encode LAYOUTSTATS request
 646  */
 647 static void nfs4_xdr_enc_layoutstats(struct rpc_rqst *req,
 648                                      struct xdr_stream *xdr,
 649                                      const void *data)
 650 {
 651         const struct nfs42_layoutstat_args *args = data;
 652         int i;
 653
 654         struct compound_hdr hdr = {
 655                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 656         };
 657
 658         encode_compound_hdr(xdr, req, &hdr);
 659         encode_sequence(xdr, &args->seq_args, &hdr);
 660         encode_putfh(xdr, args->fh, &hdr);
 661         WARN_ON(args->num_dev > PNFS_LAYOUTSTATS_MAXDEV);
 662         for (i = 0; i < args->num_dev; i++)
 663                 encode_layoutstats(xdr, args, &args->devinfo[i], &hdr);
 664         encode_nops(&hdr);
 665 }
 666
 667 /*
 668  * Encode CLONE request
 669  */
 670 static void nfs4_xdr_enc_clone(struct rpc_rqst *req,
 671                                struct xdr_stream *xdr,
 672                                const void *data)
 673 {
 674         const struct nfs42_clone_args *args = data;
 675         struct compound_hdr hdr = {
 676                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 677         };
 678
 679         encode_compound_hdr(xdr, req, &hdr);
 680         encode_sequence(xdr, &args->seq_args, &hdr);
 681         encode_putfh(xdr, args->src_fh, &hdr);
 682         encode_savefh(xdr, &hdr);
 683         encode_putfh(xdr, args->dst_fh, &hdr);
 684         encode_clone(xdr, args, &hdr);
 685         encode_getfattr(xdr, args->dst_bitmask, &hdr);
 686         encode_nops(&hdr);
 687 }
 688
 689 /*
 690  * Encode LAYOUTERROR request
 691  */
 692 static void nfs4_xdr_enc_layouterror(struct rpc_rqst *req,
 693                                      struct xdr_stream *xdr,
 694                                      const void *data)
 695 {
 696         const struct nfs42_layouterror_args *args = data;
 697         struct compound_hdr hdr = {
 698                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 699         };
 700         int i;
 701
 702         encode_compound_hdr(xdr, req, &hdr);
 703         encode_sequence(xdr, &args->seq_args, &hdr);
 704         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
 705         for (i = 0; i < args->num_errors; i++)
 706                 encode_layouterror(xdr, &args->errors[i], &hdr);
 707         encode_nops(&hdr);
 708 }
 709
 710 /*
 711  * Encode SETXATTR request
 712  */
 713 static void nfs4_xdr_enc_setxattr(struct rpc_rqst *req, struct xdr_stream *xdr,
 714                                   const void *data)
 715 {
 716         const struct nfs42_setxattrargs *args = data;
 717         struct compound_hdr hdr = {
 718                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 719         };
 720
 721         encode_compound_hdr(xdr, req, &hdr);
 722         encode_sequence(xdr, &args->seq_args, &hdr);
 723         encode_putfh(xdr, args->fh, &hdr);
 724         encode_setxattr(xdr, args, &hdr);
 725         encode_getfattr(xdr, args->bitmask, &hdr);
 726         encode_nops(&hdr);
 727 }
 728
 729 /*
 730  * Encode GETXATTR request
 731  */
 732 static void nfs4_xdr_enc_getxattr(struct rpc_rqst *req, struct xdr_stream *xdr,
 733                                   const void *data)
 734 {
 735         const struct nfs42_getxattrargs *args = data;
 736         struct compound_hdr hdr = {
 737                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 738         };
 739         uint32_t replen;
 740
 741         encode_compound_hdr(xdr, req, &hdr);
 742         encode_sequence(xdr, &args->seq_args, &hdr);
 743         encode_putfh(xdr, args->fh, &hdr);
 744         replen = hdr.replen + op_decode_hdr_maxsz + 1;
 745         encode_getxattr(xdr, args->xattr_name, &hdr);
 746
 747         rpc_prepare_reply_pages(req, args->xattr_pages, 0, args->xattr_len,
 748                                 replen);
 749
 750         encode_nops(&hdr);
 751 }
 752
 753 /*
 754  * Encode LISTXATTR request
 755  */
 756 static void nfs4_xdr_enc_listxattrs(struct rpc_rqst *req,
 757                                     struct xdr_stream *xdr, const void *data)
 758 {
 759         const struct nfs42_listxattrsargs *args = data;
 760         struct compound_hdr hdr = {
 761                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 762         };
 763         uint32_t replen;
 764
 765         encode_compound_hdr(xdr, req, &hdr);
 766         encode_sequence(xdr, &args->seq_args, &hdr);
 767         encode_putfh(xdr, args->fh, &hdr);
 768         replen = hdr.replen + op_decode_hdr_maxsz + 2 + 1;
 769         encode_listxattrs(xdr, args, &hdr);
 770
 771         rpc_prepare_reply_pages(req, args->xattr_pages, 0, args->count, replen);
 772
 773         encode_nops(&hdr);
 774 }
 775
 776 /*
 777  * Encode REMOVEXATTR request
 778  */
 779 static void nfs4_xdr_enc_removexattr(struct rpc_rqst *req,
 780                                      struct xdr_stream *xdr, const void *data)
 781 {
 782         const struct nfs42_removexattrargs *args = data;
 783         struct compound_hdr hdr = {
 784                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
 785         };
 786
 787         encode_compound_hdr(xdr, req, &hdr);
 788         encode_sequence(xdr, &args->seq_args, &hdr);
 789         encode_putfh(xdr, args->fh, &hdr);
 790         encode_removexattr(xdr, args->xattr_name, &hdr);
 791         encode_nops(&hdr);
 792 }
 793
 794 static int decode_allocate(struct xdr_stream *xdr, struct nfs42_falloc_res *res)
 795 {
 796         return decode_op_hdr(xdr, OP_ALLOCATE);
 797 }
 798
 799 static int decode_write_response(struct xdr_stream *xdr,
 800                                  struct nfs42_write_res *res)
 801 {
 802         __be32 *p;
 803         int status, count;
 804
 805         p = xdr_inline_decode(xdr, 4);
 806         if (unlikely(!p))
 807                 return -EIO;
 808         count = be32_to_cpup(p);
 809         if (count > 1)
 810                 return -EREMOTEIO;
 811         else if (count == 1) {
 812                 status = decode_opaque_fixed(xdr, &res->stateid,
 813                                 NFS4_STATEID_SIZE);
 814                 if (unlikely(status))
 815                         return -EIO;
 816         }
 817         p = xdr_inline_decode(xdr, 8 + 4);
 818         if (unlikely(!p))
 819                 return -EIO;
 820         p = xdr_decode_hyper(p, &res->count);
 821         res->verifier.committed = be32_to_cpup(p);
 822         return decode_verifier(xdr, &res->verifier.verifier);
 823 }
 824
 825 static int decode_nl4_server(struct xdr_stream *xdr, struct nl4_server *ns)
 826 {
 827         struct nfs42_netaddr *naddr;
 828         uint32_t dummy;
 829         char *dummy_str;
 830         __be32 *p;
 831         int status;
 832
 833         /* nl_type */
 834         p = xdr_inline_decode(xdr, 4);
 835         if (unlikely(!p))
 836                 return -EIO;
 837         ns->nl4_type = be32_to_cpup(p);
 838         switch (ns->nl4_type) {
 839         case NL4_NAME:
 840         case NL4_URL:
 841                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
 842                 if (unlikely(status))
 843                         return status;
 844                 if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
 845                         return -EIO;
 846                 memcpy(&ns->u.nl4_str, dummy_str, dummy);
 847                 ns->u.nl4_str_sz = dummy;
 848                 break;
 849         case NL4_NETADDR:
 850                 naddr = &ns->u.nl4_addr;
 851
 852                 /* netid string */
 853                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
 854                 if (unlikely(status))
 855                         return status;
 856                 if (unlikely(dummy > RPCBIND_MAXNETIDLEN))
 857                         return -EIO;
 858                 naddr->netid_len = dummy;
 859                 memcpy(naddr->netid, dummy_str, naddr->netid_len);
 860
 861                 /* uaddr string */
 862                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
 863                 if (unlikely(status))
 864                         return status;
 865                 if (unlikely(dummy > RPCBIND_MAXUADDRLEN))
 866                         return -EIO;
 867                 naddr->addr_len = dummy;
 868                 memcpy(naddr->addr, dummy_str, naddr->addr_len);
 869                 break;
 870         default:
 871                 WARN_ON_ONCE(1);
 872                 return -EIO;
 873         }
 874         return 0;
 875 }
 876
 877 static int decode_copy_requirements(struct xdr_stream *xdr,
 878                                     struct nfs42_copy_res *res) {
 879         __be32 *p;
 880
 881         p = xdr_inline_decode(xdr, 4 + 4);
 882         if (unlikely(!p))
 883                 return -EIO;
 884
 885         res->consecutive = be32_to_cpup(p++);
 886         res->synchronous = be32_to_cpup(p++);
 887         return 0;
 888 }
 889
 890 static int decode_copy(struct xdr_stream *xdr, struct nfs42_copy_res *res)
 891 {
 892         int status;
 893
 894         status = decode_op_hdr(xdr, OP_COPY);
 895         if (status == NFS4ERR_OFFLOAD_NO_REQS) {
 896                 status = decode_copy_requirements(xdr, res);
 897                 if (status)
 898                         return status;
 899                 return NFS4ERR_OFFLOAD_NO_REQS;
 900         } else if (status)
 901                 return status;
 902
 903         status = decode_write_response(xdr, &res->write_res);
 904         if (status)
 905                 return status;
 906
 907         return decode_copy_requirements(xdr, res);
 908 }
 909
 910 static int decode_offload_cancel(struct xdr_stream *xdr,
 911                                  struct nfs42_offload_status_res *res)
 912 {
 913         return decode_op_hdr(xdr, OP_OFFLOAD_CANCEL);
 914 }
 915
 916 static int decode_copy_notify(struct xdr_stream *xdr,
 917                               struct nfs42_copy_notify_res *res)
 918 {
 919         __be32 *p;
 920         int status, count;
 921
 922         status = decode_op_hdr(xdr, OP_COPY_NOTIFY);
 923         if (status)
 924                 return status;
 925         /* cnr_lease_time */
 926         p = xdr_inline_decode(xdr, 12);
 927         if (unlikely(!p))
 928                 return -EIO;
 929         p = xdr_decode_hyper(p, &res->cnr_lease_time.seconds);
 930         res->cnr_lease_time.nseconds = be32_to_cpup(p);
 931
 932         status = decode_opaque_fixed(xdr, &res->cnr_stateid, NFS4_STATEID_SIZE);
 933         if (unlikely(status))
 934                 return -EIO;
 935
 936         /* number of source addresses */
 937         p = xdr_inline_decode(xdr, 4);
 938         if (unlikely(!p))
 939                 return -EIO;
 940
 941         count = be32_to_cpup(p);
 942         if (count > 1)
 943                 pr_warn("NFS: %s: nsvr %d > Supported. Use first servers\n",
 944                          __func__, count);
 945
 946         status = decode_nl4_server(xdr, &res->cnr_src);
 947         if (unlikely(status))
 948                 return -EIO;
 949         return 0;
 950 }
 951
 952 static int decode_deallocate(struct xdr_stream *xdr, struct nfs42_falloc_res *res)
 953 {
 954         return decode_op_hdr(xdr, OP_DEALLOCATE);
 955 }
 956
 957 struct read_plus_segment {
 958         enum data_content4 type;
 959         uint64_t offset;
 960         union {
 961                 struct {
 962                         uint64_t length;
 963                 } hole;
 964
 965                 struct {
 966                         uint32_t length;
 967                         unsigned int from;
 968                 } data;
 969         };
 970 };
 971
 972 static inline uint64_t read_plus_segment_length(struct read_plus_segment *seg)
 973 {
 974         return seg->type == NFS4_CONTENT_DATA ? seg->data.length : seg->hole.length;
 975 }
 976
 977 static int decode_read_plus_segment(struct xdr_stream *xdr,
 978                                     struct read_plus_segment *seg)
 979 {
 980         __be32 *p;
 981
 982         p = xdr_inline_decode(xdr, 4);
 983         if (!p)
 984                 return -EIO;
 985         seg->type = be32_to_cpup(p++);
 986
 987         p = xdr_inline_decode(xdr, seg->type == NFS4_CONTENT_DATA ? 12 : 16);
 988         if (!p)
 989                 return -EIO;
 990         p = xdr_decode_hyper(p, &seg->offset);
 991
 992         if (seg->type == NFS4_CONTENT_DATA) {
 993                 struct xdr_buf buf;
 994                 uint32_t len = be32_to_cpup(p);
 995
 996                 seg->data.length = len;
 997                 seg->data.from = xdr_stream_pos(xdr);
 998
 999                 if (!xdr_stream_subsegment(xdr, &buf, xdr_align_size(len)))
1000                         return -EIO;
1001         } else if (seg->type == NFS4_CONTENT_HOLE) {
1002                 xdr_decode_hyper(p, &seg->hole.length);
1003         } else
1004                 return -EINVAL;
1005         return 0;
1006 }
1007
1008 static int process_read_plus_segment(struct xdr_stream *xdr,
1009                                      struct nfs_pgio_args *args,
1010                                      struct nfs_pgio_res *res,
1011                                      struct read_plus_segment *seg)
1012 {
1013         unsigned long offset = seg->offset;
1014         unsigned long length = read_plus_segment_length(seg);
1015         unsigned int bufpos;
1016
1017         if (offset + length < args->offset)
1018                 return 0;
1019         else if (offset > args->offset + args->count) {
1020                 res->eof = 0;
1021                 return 0;
1022         } else if (offset < args->offset) {
1023                 length -= (args->offset - offset);
1024                 offset = args->offset;
1025         } else if (offset + length > args->offset + args->count) {
1026                 length = (args->offset + args->count) - offset;
1027                 res->eof = 0;
1028         }
1029
1030         bufpos = xdr->buf->head[0].iov_len + (offset - args->offset);
1031         if (seg->type == NFS4_CONTENT_HOLE)
1032                 return xdr_stream_zero(xdr, bufpos, length);
1033         else
1034                 return xdr_stream_move_subsegment(xdr, seg->data.from, bufpos, length);
1035 }
1036
1037 static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res)
1038 {
1039         struct nfs_pgio_header *hdr =
1040                 container_of(res, struct nfs_pgio_header, res);
1041         struct nfs_pgio_args *args = &hdr->args;
1042         uint32_t segments;
1043         struct read_plus_segment *segs;
1044         int status, i;
1045         __be32 *p;
1046
1047         status = decode_op_hdr(xdr, OP_READ_PLUS);
1048         if (status)
1049                 return status;
1050
1051         p = xdr_inline_decode(xdr, 4 + 4);
1052         if (unlikely(!p))
1053                 return -EIO;
1054
1055         res->count = 0;
1056         res->eof = be32_to_cpup(p++);
1057         segments = be32_to_cpup(p++);
1058         if (segments == 0)
1059                 return status;
1060
1061         segs = kmalloc_array(segments, sizeof(*segs), GFP_KERNEL);
1062         if (!segs)
1063                 return -ENOMEM;
1064
1065         status = -EIO;
1066         for (i = 0; i < segments; i++) {
1067                 status = decode_read_plus_segment(xdr, &segs[i]);
1068                 if (status < 0)
1069                         goto out;
1070         }
1071
1072         xdr_set_pagelen(xdr, xdr_align_size(args->count));
1073         for (i = segments; i > 0; i--)
1074                 res->count += process_read_plus_segment(xdr, args, res, &segs[i-1]);
1075         status = 0;
1076
1077 out:
1078         kfree(segs);
1079         return status;
1080 }
1081
1082 static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res)
1083 {
1084         int status;
1085         __be32 *p;
1086
1087         status = decode_op_hdr(xdr, OP_SEEK);
1088         if (status)
1089                 return status;
1090
1091         p = xdr_inline_decode(xdr, 4 + 8);
1092         if (unlikely(!p))
1093                 return -EIO;
1094
1095         res->sr_eof = be32_to_cpup(p++);
1096         p = xdr_decode_hyper(p, &res->sr_offset);
1097         return 0;
1098 }
1099
1100 static int decode_layoutstats(struct xdr_stream *xdr)
1101 {
1102         return decode_op_hdr(xdr, OP_LAYOUTSTATS);
1103 }
1104
1105 static int decode_clone(struct xdr_stream *xdr)
1106 {
1107         return decode_op_hdr(xdr, OP_CLONE);
1108 }
1109
1110 static int decode_layouterror(struct xdr_stream *xdr)
1111 {
1112         return decode_op_hdr(xdr, OP_LAYOUTERROR);
1113 }
1114
1115 static int decode_setxattr(struct xdr_stream *xdr,
1116                            struct nfs4_change_info *cinfo)
1117 {
1118         int status;
1119
1120         status = decode_op_hdr(xdr, OP_SETXATTR);
1121         if (status)
1122                 goto out;
1123         status = decode_change_info(xdr, cinfo);
1124 out:
1125         return status;
1126 }
1127
1128 static int decode_getxattr(struct xdr_stream *xdr,
1129                            struct nfs42_getxattrres *res,
1130                            struct rpc_rqst *req)
1131 {
1132         int status;
1133         __be32 *p;
1134         u32 len, rdlen;
1135
1136         status = decode_op_hdr(xdr, OP_GETXATTR);
1137         if (status)
1138                 return status;
1139
1140         p = xdr_inline_decode(xdr, 4);
1141         if (unlikely(!p))
1142                 return -EIO;
1143
1144         len = be32_to_cpup(p);
1145
1146         /*
1147          * Only check against the page length here. The actual
1148          * requested length may be smaller, but that is only
1149          * checked against after possibly caching a valid reply.
1150          */
1151         if (len > req->rq_rcv_buf.page_len)
1152                 return -ERANGE;
1153
1154         res->xattr_len = len;
1155
1156         if (len > 0) {
1157                 rdlen = xdr_read_pages(xdr, len);
1158                 if (rdlen < len)
1159                         return -EIO;
1160         }
1161
1162         return 0;
1163 }
1164
1165 static int decode_removexattr(struct xdr_stream *xdr,
1166                            struct nfs4_change_info *cinfo)
1167 {
1168         int status;
1169
1170         status = decode_op_hdr(xdr, OP_REMOVEXATTR);
1171         if (status)
1172                 goto out;
1173
1174         status = decode_change_info(xdr, cinfo);
1175 out:
1176         return status;
1177 }
1178
1179 static int decode_listxattrs(struct xdr_stream *xdr,
1180                             struct nfs42_listxattrsres *res)
1181 {
1182         int status;
1183         __be32 *p;
1184         u32 count, len, ulen;
1185         size_t left, copied;
1186         char *buf;
1187
1188         status = decode_op_hdr(xdr, OP_LISTXATTRS);
1189         if (status) {
1190                 /*
1191                  * Special case: for LISTXATTRS, NFS4ERR_TOOSMALL
1192                  * should be translated to ERANGE.
1193                  */
1194                 if (status == -ETOOSMALL)
1195                         status = -ERANGE;
1196                 /*
1197                  * Special case: for LISTXATTRS, NFS4ERR_NOXATTR
1198                  * should be translated to success with zero-length reply.
1199                  */
1200                 if (status == -ENODATA) {
1201                         res->eof = true;
1202                         status = 0;
1203                 }
1204                 goto out;
1205         }
1206
1207         p = xdr_inline_decode(xdr, 8);
1208         if (unlikely(!p))
1209                 return -EIO;
1210
1211         xdr_decode_hyper(p, &res->cookie);
1212
1213         p = xdr_inline_decode(xdr, 4);
1214         if (unlikely(!p))
1215                 return -EIO;
1216
1217         left = res->xattr_len;
1218         buf = res->xattr_buf;
1219
1220         count = be32_to_cpup(p);
1221         copied = 0;
1222
1223         /*
1224          * We have asked for enough room to encode the maximum number
1225          * of possible attribute names, so everything should fit.
1226          *
1227          * But, don't rely on that assumption. Just decode entries
1228          * until they don't fit anymore, just in case the server did
1229          * something odd.
1230          */
1231         while (count--) {
1232                 p = xdr_inline_decode(xdr, 4);
1233                 if (unlikely(!p))
1234                         return -EIO;
1235
1236                 len = be32_to_cpup(p);
1237                 if (len > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN)) {
1238                         status = -ERANGE;
1239                         goto out;
1240                 }
1241
1242                 p = xdr_inline_decode(xdr, len);
1243                 if (unlikely(!p))
1244                         return -EIO;
1245
1246                 ulen = len + XATTR_USER_PREFIX_LEN + 1;
1247                 if (buf) {
1248                         if (ulen > left) {
1249                                 status = -ERANGE;
1250                                 goto out;
1251                         }
1252
1253                         memcpy(buf, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
1254                         memcpy(buf + XATTR_USER_PREFIX_LEN, p, len);
1255
1256                         buf[ulen - 1] = 0;
1257                         buf += ulen;
1258                         left -= ulen;
1259                 }
1260                 copied += ulen;
1261         }
1262
1263         p = xdr_inline_decode(xdr, 4);
1264         if (unlikely(!p))
1265                 return -EIO;
1266
1267         res->eof = be32_to_cpup(p);
1268         res->copied = copied;
1269
1270 out:
1271         if (status == -ERANGE && res->xattr_len == XATTR_LIST_MAX)
1272                 status = -E2BIG;
1273
1274         return status;
1275 }
1276
1277 /*
1278  * Decode ALLOCATE request
1279  */
1280 static int nfs4_xdr_dec_allocate(struct rpc_rqst *rqstp,
1281                                  struct xdr_stream *xdr,
1282                                  void *data)
1283 {
1284         struct nfs42_falloc_res *res = data;
1285         struct compound_hdr hdr;
1286         int status;
1287
1288         status = decode_compound_hdr(xdr, &hdr);
1289         if (status)
1290                 goto out;
1291         status = decode_sequence(xdr, &res->seq_res, rqstp);
1292         if (status)
1293                 goto out;
1294         status = decode_putfh(xdr);
1295         if (status)
1296                 goto out;
1297         status = decode_allocate(xdr, res);
1298         if (status)
1299                 goto out;
1300         decode_getfattr(xdr, res->falloc_fattr, res->falloc_server);
1301 out:
1302         return status;
1303 }
1304
1305 /*
1306  * Decode COPY response
1307  */
1308 static int nfs4_xdr_dec_copy(struct rpc_rqst *rqstp,
1309                              struct xdr_stream *xdr,
1310                              void *data)
1311 {
1312         struct nfs42_copy_res *res = data;
1313         struct compound_hdr hdr;
1314         int status;
1315
1316         status = decode_compound_hdr(xdr, &hdr);
1317         if (status)
1318                 goto out;
1319         status = decode_sequence(xdr, &res->seq_res, rqstp);
1320         if (status)
1321                 goto out;
1322         status = decode_putfh(xdr);
1323         if (status)
1324                 goto out;
1325         status = decode_savefh(xdr);
1326         if (status)
1327                 goto out;
1328         status = decode_putfh(xdr);
1329         if (status)
1330                 goto out;
1331         status = decode_copy(xdr, res);
1332         if (status)
1333                 goto out;
1334         if (res->commit_res.verf)
1335                 status = decode_commit(xdr, &res->commit_res);
1336 out:
1337         return status;
1338 }
1339
1340 /*
1341  * Decode OFFLOAD_CANCEL response
1342  */
1343 static int nfs4_xdr_dec_offload_cancel(struct rpc_rqst *rqstp,
1344                                        struct xdr_stream *xdr,
1345                                        void *data)
1346 {
1347         struct nfs42_offload_status_res *res = data;
1348         struct compound_hdr hdr;
1349         int status;
1350
1351         status = decode_compound_hdr(xdr, &hdr);
1352         if (status)
1353                 goto out;
1354         status = decode_sequence(xdr, &res->osr_seq_res, rqstp);
1355         if (status)
1356                 goto out;
1357         status = decode_putfh(xdr);
1358         if (status)
1359                 goto out;
1360         status = decode_offload_cancel(xdr, res);
1361
1362 out:
1363         return status;
1364 }
1365
1366 /*
1367  * Decode COPY_NOTIFY response
1368  */
1369 static int nfs4_xdr_dec_copy_notify(struct rpc_rqst *rqstp,
1370                                     struct xdr_stream *xdr,
1371                                     void *data)
1372 {
1373         struct nfs42_copy_notify_res *res = data;
1374         struct compound_hdr hdr;
1375         int status;
1376
1377         status = decode_compound_hdr(xdr, &hdr);
1378         if (status)
1379                 goto out;
1380         status = decode_sequence(xdr, &res->cnr_seq_res, rqstp);
1381         if (status)
1382                 goto out;
1383         status = decode_putfh(xdr);
1384         if (status)
1385                 goto out;
1386         status = decode_copy_notify(xdr, res);
1387
1388 out:
1389         return status;
1390 }
1391
1392 /*
1393  * Decode DEALLOCATE request
1394  */
1395 static int nfs4_xdr_dec_deallocate(struct rpc_rqst *rqstp,
1396                                    struct xdr_stream *xdr,
1397                                    void *data)
1398 {
1399         struct nfs42_falloc_res *res = data;
1400         struct compound_hdr hdr;
1401         int status;
1402
1403         status = decode_compound_hdr(xdr, &hdr);
1404         if (status)
1405                 goto out;
1406         status = decode_sequence(xdr, &res->seq_res, rqstp);
1407         if (status)
1408                 goto out;
1409         status = decode_putfh(xdr);
1410         if (status)
1411                 goto out;
1412         status = decode_deallocate(xdr, res);
1413         if (status)
1414                 goto out;
1415         decode_getfattr(xdr, res->falloc_fattr, res->falloc_server);
1416 out:
1417         return status;
1418 }
1419
1420 /*
1421  * Decode READ_PLUS request
1422  */
1423 static int nfs4_xdr_dec_read_plus(struct rpc_rqst *rqstp,
1424                                   struct xdr_stream *xdr,
1425                                   void *data)
1426 {
1427         struct nfs_pgio_res *res = data;
1428         struct compound_hdr hdr;
1429         int status;
1430
1431         xdr_set_scratch_buffer(xdr, res->scratch, sizeof(res->scratch));
1432
1433         status = decode_compound_hdr(xdr, &hdr);
1434         if (status)
1435                 goto out;
1436         status = decode_sequence(xdr, &res->seq_res, rqstp);
1437         if (status)
1438                 goto out;
1439         status = decode_putfh(xdr);
1440         if (status)
1441                 goto out;
1442         status = decode_read_plus(xdr, res);
1443         if (!status)
1444                 status = res->count;
1445 out:
1446         return status;
1447 }
1448
1449 /*
1450  * Decode SEEK request
1451  */
1452 static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp,
1453                              struct xdr_stream *xdr,
1454                              void *data)
1455 {
1456         struct nfs42_seek_res *res = data;
1457         struct compound_hdr hdr;
1458         int status;
1459
1460         status = decode_compound_hdr(xdr, &hdr);
1461         if (status)
1462                 goto out;
1463         status = decode_sequence(xdr, &res->seq_res, rqstp);
1464         if (status)
1465                 goto out;
1466         status = decode_putfh(xdr);
1467         if (status)
1468                 goto out;
1469         status = decode_seek(xdr, res);
1470 out:
1471         return status;
1472 }
1473
1474 /*
1475  * Decode LAYOUTSTATS request
1476  */
1477 static int nfs4_xdr_dec_layoutstats(struct rpc_rqst *rqstp,
1478                                     struct xdr_stream *xdr,
1479                                     void *data)
1480 {
1481         struct nfs42_layoutstat_res *res = data;
1482         struct compound_hdr hdr;
1483         int status, i;
1484
1485         status = decode_compound_hdr(xdr, &hdr);
1486         if (status)
1487                 goto out;
1488         status = decode_sequence(xdr, &res->seq_res, rqstp);
1489         if (status)
1490                 goto out;
1491         status = decode_putfh(xdr);
1492         if (status)
1493                 goto out;
1494         WARN_ON(res->num_dev > PNFS_LAYOUTSTATS_MAXDEV);
1495         for (i = 0; i < res->num_dev; i++) {
1496                 status = decode_layoutstats(xdr);
1497                 if (status)
1498                         goto out;
1499         }
1500 out:
1501         res->rpc_status = status;
1502         return status;
1503 }
1504
1505 /*
1506  * Decode CLONE request
1507  */
1508 static int nfs4_xdr_dec_clone(struct rpc_rqst *rqstp,
1509                               struct xdr_stream *xdr,
1510                               void *data)
1511 {
1512         struct nfs42_clone_res *res = data;
1513         struct compound_hdr hdr;
1514         int status;
1515
1516         status = decode_compound_hdr(xdr, &hdr);
1517         if (status)
1518                 goto out;
1519         status = decode_sequence(xdr, &res->seq_res, rqstp);
1520         if (status)
1521                 goto out;
1522         status = decode_putfh(xdr);
1523         if (status)
1524                 goto out;
1525         status = decode_savefh(xdr);
1526         if (status)
1527                 goto out;
1528         status = decode_putfh(xdr);
1529         if (status)
1530                 goto out;
1531         status = decode_clone(xdr);
1532         if (status)
1533                 goto out;
1534         decode_getfattr(xdr, res->dst_fattr, res->server);
1535 out:
1536         res->rpc_status = status;
1537         return status;
1538 }
1539
1540 /*
1541  * Decode LAYOUTERROR request
1542  */
1543 static int nfs4_xdr_dec_layouterror(struct rpc_rqst *rqstp,
1544                                     struct xdr_stream *xdr,
1545                                     void *data)
1546 {
1547         struct nfs42_layouterror_res *res = data;
1548         struct compound_hdr hdr;
1549         int status, i;
1550
1551         status = decode_compound_hdr(xdr, &hdr);
1552         if (status)
1553                 goto out;
1554         status = decode_sequence(xdr, &res->seq_res, rqstp);
1555         if (status)
1556                 goto out;
1557         status = decode_putfh(xdr);
1558
1559         for (i = 0; i < res->num_errors && status == 0; i++)
1560                 status = decode_layouterror(xdr);
1561 out:
1562         res->rpc_status = status;
1563         return status;
1564 }
1565
1566 /*
1567  * Decode SETXATTR request
1568  */
1569 static int nfs4_xdr_dec_setxattr(struct rpc_rqst *req, struct xdr_stream *xdr,
1570                                  void *data)
1571 {
1572         struct nfs42_setxattrres *res = data;
1573         struct compound_hdr hdr;
1574         int status;
1575
1576         status = decode_compound_hdr(xdr, &hdr);
1577         if (status)
1578                 goto out;
1579         status = decode_sequence(xdr, &res->seq_res, req);
1580         if (status)
1581                 goto out;
1582         status = decode_putfh(xdr);
1583         if (status)
1584                 goto out;
1585         status = decode_setxattr(xdr, &res->cinfo);
1586         if (status)
1587                 goto out;
1588         status = decode_getfattr(xdr, res->fattr, res->server);
1589 out:
1590         return status;
1591 }
1592
1593 /*
1594  * Decode GETXATTR request
1595  */
1596 static int nfs4_xdr_dec_getxattr(struct rpc_rqst *rqstp,
1597                                  struct xdr_stream *xdr, void *data)
1598 {
1599         struct nfs42_getxattrres *res = data;
1600         struct compound_hdr hdr;
1601         int status;
1602
1603         status = decode_compound_hdr(xdr, &hdr);
1604         if (status)
1605                 goto out;
1606         status = decode_sequence(xdr, &res->seq_res, rqstp);
1607         if (status)
1608                 goto out;
1609         status = decode_putfh(xdr);
1610         if (status)
1611                 goto out;
1612         status = decode_getxattr(xdr, res, rqstp);
1613 out:
1614         return status;
1615 }
1616
1617 /*
1618  * Decode LISTXATTR request
1619  */
1620 static int nfs4_xdr_dec_listxattrs(struct rpc_rqst *rqstp,
1621                                    struct xdr_stream *xdr, void *data)
1622 {
1623         struct nfs42_listxattrsres *res = data;
1624         struct compound_hdr hdr;
1625         int status;
1626
1627         xdr_set_scratch_page(xdr, res->scratch);
1628
1629         status = decode_compound_hdr(xdr, &hdr);
1630         if (status)
1631                 goto out;
1632         status = decode_sequence(xdr, &res->seq_res, rqstp);
1633         if (status)
1634                 goto out;
1635         status = decode_putfh(xdr);
1636         if (status)
1637                 goto out;
1638         status = decode_listxattrs(xdr, res);
1639 out:
1640         return status;
1641 }
1642
1643 /*
1644  * Decode REMOVEXATTR request
1645  */
1646 static int nfs4_xdr_dec_removexattr(struct rpc_rqst *req,
1647                                     struct xdr_stream *xdr, void *data)
1648 {
1649         struct nfs42_removexattrres *res = data;
1650         struct compound_hdr hdr;
1651         int status;
1652
1653         status = decode_compound_hdr(xdr, &hdr);
1654         if (status)
1655                 goto out;
1656         status = decode_sequence(xdr, &res->seq_res, req);
1657         if (status)
1658                 goto out;
1659         status = decode_putfh(xdr);
1660         if (status)
1661                 goto out;
1662
1663         status = decode_removexattr(xdr, &res->cinfo);
1664 out:
1665         return status;
1666 }
1667 #endif /* __LINUX_FS_NFS_NFS4_2XDR_H */