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