1 /* 2 * linux/fs/nfs/callback_xdr.c 3 * 4 * Copyright (C) 2004 Trond Myklebust 5 * 6 * NFSv4 callback encode/decode procedures 7 */ 8 #include <linux/kernel.h> 9 #include <linux/sunrpc/svc.h> 10 #include <linux/nfs4.h> 11 #include <linux/nfs_fs.h> 12 #include "nfs4_fs.h" 13 #include "callback.h" 14 15 #define CB_OP_TAGLEN_MAXSZ (512) 16 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ) 17 #define CB_OP_GETATTR_BITMAP_MAXSZ (4) 18 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 19 CB_OP_GETATTR_BITMAP_MAXSZ + \ 20 2 + 2 + 3 + 3) 21 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 22 23 #if defined(CONFIG_NFS_V4_1) 24 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \ 25 4 + 1 + 3) 26 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) 27 #endif /* CONFIG_NFS_V4_1 */ 28 29 #define NFSDBG_FACILITY NFSDBG_CALLBACK 30 31 typedef __be32 (*callback_process_op_t)(void *, void *); 32 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *); 33 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *); 34 35 36 struct callback_op { 37 callback_process_op_t process_op; 38 callback_decode_arg_t decode_args; 39 callback_encode_res_t encode_res; 40 long res_maxsize; 41 }; 42 43 static struct callback_op callback_ops[]; 44 45 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp) 46 { 47 return htonl(NFS4_OK); 48 } 49 50 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 51 { 52 return xdr_argsize_check(rqstp, p); 53 } 54 55 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) 56 { 57 return xdr_ressize_check(rqstp, p); 58 } 59 60 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes) 61 { 62 __be32 *p; 63 64 p = xdr_inline_decode(xdr, nbytes); 65 if (unlikely(p == NULL)) 66 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n"); 67 return p; 68 } 69 70 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str) 71 { 72 __be32 *p; 73 74 p = read_buf(xdr, 4); 75 if (unlikely(p == NULL)) 76 return htonl(NFS4ERR_RESOURCE); 77 *len = ntohl(*p); 78 79 if (*len != 0) { 80 p = read_buf(xdr, *len); 81 if (unlikely(p == NULL)) 82 return htonl(NFS4ERR_RESOURCE); 83 *str = (const char *)p; 84 } else 85 *str = NULL; 86 87 return 0; 88 } 89 90 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 91 { 92 __be32 *p; 93 94 p = read_buf(xdr, 4); 95 if (unlikely(p == NULL)) 96 return htonl(NFS4ERR_RESOURCE); 97 fh->size = ntohl(*p); 98 if (fh->size > NFS4_FHSIZE) 99 return htonl(NFS4ERR_BADHANDLE); 100 p = read_buf(xdr, fh->size); 101 if (unlikely(p == NULL)) 102 return htonl(NFS4ERR_RESOURCE); 103 memcpy(&fh->data[0], p, fh->size); 104 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size); 105 return 0; 106 } 107 108 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap) 109 { 110 __be32 *p; 111 unsigned int attrlen; 112 113 p = read_buf(xdr, 4); 114 if (unlikely(p == NULL)) 115 return htonl(NFS4ERR_RESOURCE); 116 attrlen = ntohl(*p); 117 p = read_buf(xdr, attrlen << 2); 118 if (unlikely(p == NULL)) 119 return htonl(NFS4ERR_RESOURCE); 120 if (likely(attrlen > 0)) 121 bitmap[0] = ntohl(*p++); 122 if (attrlen > 1) 123 bitmap[1] = ntohl(*p); 124 return 0; 125 } 126 127 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 128 { 129 __be32 *p; 130 131 p = read_buf(xdr, 16); 132 if (unlikely(p == NULL)) 133 return htonl(NFS4ERR_RESOURCE); 134 memcpy(stateid->data, p, 16); 135 return 0; 136 } 137 138 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr) 139 { 140 __be32 *p; 141 __be32 status; 142 143 status = decode_string(xdr, &hdr->taglen, &hdr->tag); 144 if (unlikely(status != 0)) 145 return status; 146 /* We do not like overly long tags! */ 147 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) { 148 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n", 149 __func__, hdr->taglen); 150 return htonl(NFS4ERR_RESOURCE); 151 } 152 p = read_buf(xdr, 12); 153 if (unlikely(p == NULL)) 154 return htonl(NFS4ERR_RESOURCE); 155 hdr->minorversion = ntohl(*p++); 156 /* Check minor version is zero or one. */ 157 if (hdr->minorversion <= 1) { 158 p++; /* skip callback_ident */ 159 } else { 160 printk(KERN_WARNING "%s: NFSv4 server callback with " 161 "illegal minor version %u!\n", 162 __func__, hdr->minorversion); 163 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 164 } 165 hdr->nops = ntohl(*p); 166 dprintk("%s: minorversion %d nops %d\n", __func__, 167 hdr->minorversion, hdr->nops); 168 return 0; 169 } 170 171 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op) 172 { 173 __be32 *p; 174 p = read_buf(xdr, 4); 175 if (unlikely(p == NULL)) 176 return htonl(NFS4ERR_RESOURCE); 177 *op = ntohl(*p); 178 return 0; 179 } 180 181 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args) 182 { 183 __be32 status; 184 185 status = decode_fh(xdr, &args->fh); 186 if (unlikely(status != 0)) 187 goto out; 188 args->addr = svc_addr(rqstp); 189 status = decode_bitmap(xdr, args->bitmap); 190 out: 191 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 192 return status; 193 } 194 195 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args) 196 { 197 __be32 *p; 198 __be32 status; 199 200 args->addr = svc_addr(rqstp); 201 status = decode_stateid(xdr, &args->stateid); 202 if (unlikely(status != 0)) 203 goto out; 204 p = read_buf(xdr, 4); 205 if (unlikely(p == NULL)) { 206 status = htonl(NFS4ERR_RESOURCE); 207 goto out; 208 } 209 args->truncate = ntohl(*p); 210 status = decode_fh(xdr, &args->fh); 211 out: 212 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 213 return status; 214 } 215 216 #if defined(CONFIG_NFS_V4_1) 217 218 static unsigned decode_sessionid(struct xdr_stream *xdr, 219 struct nfs4_sessionid *sid) 220 { 221 uint32_t *p; 222 int len = NFS4_MAX_SESSIONID_LEN; 223 224 p = read_buf(xdr, len); 225 if (unlikely(p == NULL)) 226 return htonl(NFS4ERR_RESOURCE); 227 228 memcpy(sid->data, p, len); 229 return 0; 230 } 231 232 static unsigned decode_rc_list(struct xdr_stream *xdr, 233 struct referring_call_list *rc_list) 234 { 235 uint32_t *p; 236 int i; 237 unsigned status; 238 239 status = decode_sessionid(xdr, &rc_list->rcl_sessionid); 240 if (status) 241 goto out; 242 243 status = htonl(NFS4ERR_RESOURCE); 244 p = read_buf(xdr, sizeof(uint32_t)); 245 if (unlikely(p == NULL)) 246 goto out; 247 248 rc_list->rcl_nrefcalls = ntohl(*p++); 249 if (rc_list->rcl_nrefcalls) { 250 p = read_buf(xdr, 251 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t)); 252 if (unlikely(p == NULL)) 253 goto out; 254 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls * 255 sizeof(*rc_list->rcl_refcalls), 256 GFP_KERNEL); 257 if (unlikely(rc_list->rcl_refcalls == NULL)) 258 goto out; 259 for (i = 0; i < rc_list->rcl_nrefcalls; i++) { 260 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++); 261 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++); 262 } 263 } 264 status = 0; 265 266 out: 267 return status; 268 } 269 270 static unsigned decode_cb_sequence_args(struct svc_rqst *rqstp, 271 struct xdr_stream *xdr, 272 struct cb_sequenceargs *args) 273 { 274 uint32_t *p; 275 int i; 276 unsigned status; 277 278 status = decode_sessionid(xdr, &args->csa_sessionid); 279 if (status) 280 goto out; 281 282 status = htonl(NFS4ERR_RESOURCE); 283 p = read_buf(xdr, 5 * sizeof(uint32_t)); 284 if (unlikely(p == NULL)) 285 goto out; 286 287 args->csa_addr = svc_addr(rqstp); 288 args->csa_sequenceid = ntohl(*p++); 289 args->csa_slotid = ntohl(*p++); 290 args->csa_highestslotid = ntohl(*p++); 291 args->csa_cachethis = ntohl(*p++); 292 args->csa_nrclists = ntohl(*p++); 293 args->csa_rclists = NULL; 294 if (args->csa_nrclists) { 295 args->csa_rclists = kmalloc(args->csa_nrclists * 296 sizeof(*args->csa_rclists), 297 GFP_KERNEL); 298 if (unlikely(args->csa_rclists == NULL)) 299 goto out; 300 301 for (i = 0; i < args->csa_nrclists; i++) { 302 status = decode_rc_list(xdr, &args->csa_rclists[i]); 303 if (status) 304 goto out_free; 305 } 306 } 307 status = 0; 308 309 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u " 310 "highestslotid %u cachethis %d nrclists %u\n", 311 __func__, 312 ((u32 *)&args->csa_sessionid)[0], 313 ((u32 *)&args->csa_sessionid)[1], 314 ((u32 *)&args->csa_sessionid)[2], 315 ((u32 *)&args->csa_sessionid)[3], 316 args->csa_sequenceid, args->csa_slotid, 317 args->csa_highestslotid, args->csa_cachethis, 318 args->csa_nrclists); 319 out: 320 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 321 return status; 322 323 out_free: 324 for (i = 0; i < args->csa_nrclists; i++) 325 kfree(args->csa_rclists[i].rcl_refcalls); 326 kfree(args->csa_rclists); 327 goto out; 328 } 329 330 static unsigned decode_recallany_args(struct svc_rqst *rqstp, 331 struct xdr_stream *xdr, 332 struct cb_recallanyargs *args) 333 { 334 uint32_t *p; 335 336 args->craa_addr = svc_addr(rqstp); 337 p = read_buf(xdr, 4); 338 if (unlikely(p == NULL)) 339 return htonl(NFS4ERR_BADXDR); 340 args->craa_objs_to_keep = ntohl(*p++); 341 p = read_buf(xdr, 4); 342 if (unlikely(p == NULL)) 343 return htonl(NFS4ERR_BADXDR); 344 args->craa_type_mask = ntohl(*p); 345 346 return 0; 347 } 348 349 #endif /* CONFIG_NFS_V4_1 */ 350 351 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) 352 { 353 __be32 *p; 354 355 p = xdr_reserve_space(xdr, 4 + len); 356 if (unlikely(p == NULL)) 357 return htonl(NFS4ERR_RESOURCE); 358 xdr_encode_opaque(p, str, len); 359 return 0; 360 } 361 362 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) 363 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) 364 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep) 365 { 366 __be32 bm[2]; 367 __be32 *p; 368 369 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0); 370 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1); 371 if (bm[1] != 0) { 372 p = xdr_reserve_space(xdr, 16); 373 if (unlikely(p == NULL)) 374 return htonl(NFS4ERR_RESOURCE); 375 *p++ = htonl(2); 376 *p++ = bm[0]; 377 *p++ = bm[1]; 378 } else if (bm[0] != 0) { 379 p = xdr_reserve_space(xdr, 12); 380 if (unlikely(p == NULL)) 381 return htonl(NFS4ERR_RESOURCE); 382 *p++ = htonl(1); 383 *p++ = bm[0]; 384 } else { 385 p = xdr_reserve_space(xdr, 8); 386 if (unlikely(p == NULL)) 387 return htonl(NFS4ERR_RESOURCE); 388 *p++ = htonl(0); 389 } 390 *savep = p; 391 return 0; 392 } 393 394 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change) 395 { 396 __be32 *p; 397 398 if (!(bitmap[0] & FATTR4_WORD0_CHANGE)) 399 return 0; 400 p = xdr_reserve_space(xdr, 8); 401 if (unlikely(!p)) 402 return htonl(NFS4ERR_RESOURCE); 403 p = xdr_encode_hyper(p, change); 404 return 0; 405 } 406 407 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size) 408 { 409 __be32 *p; 410 411 if (!(bitmap[0] & FATTR4_WORD0_SIZE)) 412 return 0; 413 p = xdr_reserve_space(xdr, 8); 414 if (unlikely(!p)) 415 return htonl(NFS4ERR_RESOURCE); 416 p = xdr_encode_hyper(p, size); 417 return 0; 418 } 419 420 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time) 421 { 422 __be32 *p; 423 424 p = xdr_reserve_space(xdr, 12); 425 if (unlikely(!p)) 426 return htonl(NFS4ERR_RESOURCE); 427 p = xdr_encode_hyper(p, time->tv_sec); 428 *p = htonl(time->tv_nsec); 429 return 0; 430 } 431 432 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 433 { 434 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) 435 return 0; 436 return encode_attr_time(xdr,time); 437 } 438 439 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time) 440 { 441 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) 442 return 0; 443 return encode_attr_time(xdr,time); 444 } 445 446 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr) 447 { 448 __be32 status; 449 450 hdr->status = xdr_reserve_space(xdr, 4); 451 if (unlikely(hdr->status == NULL)) 452 return htonl(NFS4ERR_RESOURCE); 453 status = encode_string(xdr, hdr->taglen, hdr->tag); 454 if (unlikely(status != 0)) 455 return status; 456 hdr->nops = xdr_reserve_space(xdr, 4); 457 if (unlikely(hdr->nops == NULL)) 458 return htonl(NFS4ERR_RESOURCE); 459 return 0; 460 } 461 462 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res) 463 { 464 __be32 *p; 465 466 p = xdr_reserve_space(xdr, 8); 467 if (unlikely(p == NULL)) 468 return htonl(NFS4ERR_RESOURCE); 469 *p++ = htonl(op); 470 *p = res; 471 return 0; 472 } 473 474 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res) 475 { 476 __be32 *savep = NULL; 477 __be32 status = res->status; 478 479 if (unlikely(status != 0)) 480 goto out; 481 status = encode_attr_bitmap(xdr, res->bitmap, &savep); 482 if (unlikely(status != 0)) 483 goto out; 484 status = encode_attr_change(xdr, res->bitmap, res->change_attr); 485 if (unlikely(status != 0)) 486 goto out; 487 status = encode_attr_size(xdr, res->bitmap, res->size); 488 if (unlikely(status != 0)) 489 goto out; 490 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime); 491 if (unlikely(status != 0)) 492 goto out; 493 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime); 494 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1))); 495 out: 496 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 497 return status; 498 } 499 500 #if defined(CONFIG_NFS_V4_1) 501 502 static unsigned encode_sessionid(struct xdr_stream *xdr, 503 const struct nfs4_sessionid *sid) 504 { 505 uint32_t *p; 506 int len = NFS4_MAX_SESSIONID_LEN; 507 508 p = xdr_reserve_space(xdr, len); 509 if (unlikely(p == NULL)) 510 return htonl(NFS4ERR_RESOURCE); 511 512 memcpy(p, sid, len); 513 return 0; 514 } 515 516 static unsigned encode_cb_sequence_res(struct svc_rqst *rqstp, 517 struct xdr_stream *xdr, 518 const struct cb_sequenceres *res) 519 { 520 uint32_t *p; 521 unsigned status = res->csr_status; 522 523 if (unlikely(status != 0)) 524 goto out; 525 526 encode_sessionid(xdr, &res->csr_sessionid); 527 528 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t)); 529 if (unlikely(p == NULL)) 530 return htonl(NFS4ERR_RESOURCE); 531 532 *p++ = htonl(res->csr_sequenceid); 533 *p++ = htonl(res->csr_slotid); 534 *p++ = htonl(res->csr_highestslotid); 535 *p++ = htonl(res->csr_target_highestslotid); 536 out: 537 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 538 return status; 539 } 540 541 static __be32 542 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 543 { 544 if (op_nr == OP_CB_SEQUENCE) { 545 if (nop != 0) 546 return htonl(NFS4ERR_SEQUENCE_POS); 547 } else { 548 if (nop == 0) 549 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 550 } 551 552 switch (op_nr) { 553 case OP_CB_GETATTR: 554 case OP_CB_RECALL: 555 case OP_CB_SEQUENCE: 556 case OP_CB_RECALL_ANY: 557 *op = &callback_ops[op_nr]; 558 break; 559 560 case OP_CB_LAYOUTRECALL: 561 case OP_CB_NOTIFY_DEVICEID: 562 case OP_CB_NOTIFY: 563 case OP_CB_PUSH_DELEG: 564 case OP_CB_RECALLABLE_OBJ_AVAIL: 565 case OP_CB_RECALL_SLOT: 566 case OP_CB_WANTS_CANCELLED: 567 case OP_CB_NOTIFY_LOCK: 568 return htonl(NFS4ERR_NOTSUPP); 569 570 default: 571 return htonl(NFS4ERR_OP_ILLEGAL); 572 } 573 574 return htonl(NFS_OK); 575 } 576 577 #else /* CONFIG_NFS_V4_1 */ 578 579 static __be32 580 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op) 581 { 582 return htonl(NFS4ERR_MINOR_VERS_MISMATCH); 583 } 584 585 #endif /* CONFIG_NFS_V4_1 */ 586 587 static __be32 588 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op) 589 { 590 switch (op_nr) { 591 case OP_CB_GETATTR: 592 case OP_CB_RECALL: 593 *op = &callback_ops[op_nr]; 594 break; 595 default: 596 return htonl(NFS4ERR_OP_ILLEGAL); 597 } 598 599 return htonl(NFS_OK); 600 } 601 602 static __be32 process_op(uint32_t minorversion, int nop, 603 struct svc_rqst *rqstp, 604 struct xdr_stream *xdr_in, void *argp, 605 struct xdr_stream *xdr_out, void *resp) 606 { 607 struct callback_op *op = &callback_ops[0]; 608 unsigned int op_nr = OP_CB_ILLEGAL; 609 __be32 status; 610 long maxlen; 611 __be32 res; 612 613 dprintk("%s: start\n", __func__); 614 status = decode_op_hdr(xdr_in, &op_nr); 615 if (unlikely(status)) { 616 status = htonl(NFS4ERR_OP_ILLEGAL); 617 goto out; 618 } 619 620 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n", 621 __func__, minorversion, nop, op_nr); 622 623 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) : 624 preprocess_nfs4_op(op_nr, &op); 625 if (status == htonl(NFS4ERR_OP_ILLEGAL)) 626 op_nr = OP_CB_ILLEGAL; 627 out: 628 maxlen = xdr_out->end - xdr_out->p; 629 if (maxlen > 0 && maxlen < PAGE_SIZE) { 630 if (likely(status == 0 && op->decode_args != NULL)) 631 status = op->decode_args(rqstp, xdr_in, argp); 632 if (likely(status == 0 && op->process_op != NULL)) 633 status = op->process_op(argp, resp); 634 } else 635 status = htonl(NFS4ERR_RESOURCE); 636 637 res = encode_op_hdr(xdr_out, op_nr, status); 638 if (status == 0) 639 status = res; 640 if (op->encode_res != NULL && status == 0) 641 status = op->encode_res(rqstp, xdr_out, resp); 642 dprintk("%s: done, status = %d\n", __func__, ntohl(status)); 643 return status; 644 } 645 646 /* 647 * Decode, process and encode a COMPOUND 648 */ 649 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp) 650 { 651 struct cb_compound_hdr_arg hdr_arg = { 0 }; 652 struct cb_compound_hdr_res hdr_res = { NULL }; 653 struct xdr_stream xdr_in, xdr_out; 654 __be32 *p; 655 __be32 status; 656 unsigned int nops = 0; 657 658 dprintk("%s: start\n", __func__); 659 660 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base); 661 662 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len); 663 xdr_init_encode(&xdr_out, &rqstp->rq_res, p); 664 665 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg); 666 if (status == __constant_htonl(NFS4ERR_RESOURCE)) 667 return rpc_garbage_args; 668 669 hdr_res.taglen = hdr_arg.taglen; 670 hdr_res.tag = hdr_arg.tag; 671 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) 672 return rpc_system_err; 673 674 while (status == 0 && nops != hdr_arg.nops) { 675 status = process_op(hdr_arg.minorversion, nops, 676 rqstp, &xdr_in, argp, &xdr_out, resp); 677 nops++; 678 } 679 680 *hdr_res.status = status; 681 *hdr_res.nops = htonl(nops); 682 dprintk("%s: done, status = %u\n", __func__, ntohl(status)); 683 return rpc_success; 684 } 685 686 /* 687 * Define NFS4 callback COMPOUND ops. 688 */ 689 static struct callback_op callback_ops[] = { 690 [0] = { 691 .res_maxsize = CB_OP_HDR_RES_MAXSZ, 692 }, 693 [OP_CB_GETATTR] = { 694 .process_op = (callback_process_op_t)nfs4_callback_getattr, 695 .decode_args = (callback_decode_arg_t)decode_getattr_args, 696 .encode_res = (callback_encode_res_t)encode_getattr_res, 697 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, 698 }, 699 [OP_CB_RECALL] = { 700 .process_op = (callback_process_op_t)nfs4_callback_recall, 701 .decode_args = (callback_decode_arg_t)decode_recall_args, 702 .res_maxsize = CB_OP_RECALL_RES_MAXSZ, 703 }, 704 #if defined(CONFIG_NFS_V4_1) 705 [OP_CB_SEQUENCE] = { 706 .process_op = (callback_process_op_t)nfs4_callback_sequence, 707 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args, 708 .encode_res = (callback_encode_res_t)encode_cb_sequence_res, 709 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, 710 }, 711 [OP_CB_RECALL_ANY] = { 712 .process_op = (callback_process_op_t)nfs4_callback_recallany, 713 .decode_args = (callback_decode_arg_t)decode_recallany_args, 714 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, 715 }, 716 #endif /* CONFIG_NFS_V4_1 */ 717 }; 718 719 /* 720 * Define NFS4 callback procedures 721 */ 722 static struct svc_procedure nfs4_callback_procedures1[] = { 723 [CB_NULL] = { 724 .pc_func = nfs4_callback_null, 725 .pc_decode = (kxdrproc_t)nfs4_decode_void, 726 .pc_encode = (kxdrproc_t)nfs4_encode_void, 727 .pc_xdrressize = 1, 728 }, 729 [CB_COMPOUND] = { 730 .pc_func = nfs4_callback_compound, 731 .pc_encode = (kxdrproc_t)nfs4_encode_void, 732 .pc_argsize = 256, 733 .pc_ressize = 256, 734 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, 735 } 736 }; 737 738 struct svc_version nfs4_callback_version1 = { 739 .vs_vers = 1, 740 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 741 .vs_proc = nfs4_callback_procedures1, 742 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 743 .vs_dispatch = NULL, 744 }; 745 746 struct svc_version nfs4_callback_version4 = { 747 .vs_vers = 4, 748 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), 749 .vs_proc = nfs4_callback_procedures1, 750 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, 751 .vs_dispatch = NULL, 752 }; 753