1 /* 2 * Copyright (c) 2001 The Regents of the University of Michigan. 3 * All rights reserved. 4 * 5 * Kendrick Smith <kmsmith@umich.edu> 6 * Andy Adamson <andros@umich.edu> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <linux/sunrpc/clnt.h> 35 #include <linux/sunrpc/xprt.h> 36 #include <linux/sunrpc/svc_xprt.h> 37 #include <linux/slab.h> 38 #include "nfsd.h" 39 #include "state.h" 40 #include "netns.h" 41 #include "xdr4cb.h" 42 #include "xdr4.h" 43 44 #define NFSDDBG_FACILITY NFSDDBG_PROC 45 46 static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason); 47 48 #define NFSPROC4_CB_NULL 0 49 #define NFSPROC4_CB_COMPOUND 1 50 51 /* Index of predefined Linux callback client operations */ 52 53 struct nfs4_cb_compound_hdr { 54 /* args */ 55 u32 ident; /* minorversion 0 only */ 56 u32 nops; 57 __be32 *nops_p; 58 u32 minorversion; 59 /* res */ 60 int status; 61 }; 62 63 /* 64 * Handle decode buffer overflows out-of-line. 65 */ 66 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) 67 { 68 dprintk("NFS: %s prematurely hit the end of our receive buffer. " 69 "Remaining buffer length is %tu words.\n", 70 func, xdr->end - xdr->p); 71 } 72 73 static __be32 *xdr_encode_empty_array(__be32 *p) 74 { 75 *p++ = xdr_zero; 76 return p; 77 } 78 79 /* 80 * Encode/decode NFSv4 CB basic data types 81 * 82 * Basic NFSv4 callback data types are defined in section 15 of RFC 83 * 3530: "Network File System (NFS) version 4 Protocol" and section 84 * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version 85 * 1 Protocol" 86 */ 87 88 /* 89 * nfs_cb_opnum4 90 * 91 * enum nfs_cb_opnum4 { 92 * OP_CB_GETATTR = 3, 93 * ... 94 * }; 95 */ 96 enum nfs_cb_opnum4 { 97 OP_CB_GETATTR = 3, 98 OP_CB_RECALL = 4, 99 OP_CB_LAYOUTRECALL = 5, 100 OP_CB_NOTIFY = 6, 101 OP_CB_PUSH_DELEG = 7, 102 OP_CB_RECALL_ANY = 8, 103 OP_CB_RECALLABLE_OBJ_AVAIL = 9, 104 OP_CB_RECALL_SLOT = 10, 105 OP_CB_SEQUENCE = 11, 106 OP_CB_WANTS_CANCELLED = 12, 107 OP_CB_NOTIFY_LOCK = 13, 108 OP_CB_NOTIFY_DEVICEID = 14, 109 OP_CB_OFFLOAD = 15, 110 OP_CB_ILLEGAL = 10044 111 }; 112 113 static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) 114 { 115 __be32 *p; 116 117 p = xdr_reserve_space(xdr, 4); 118 *p = cpu_to_be32(op); 119 } 120 121 /* 122 * nfs_fh4 123 * 124 * typedef opaque nfs_fh4<NFS4_FHSIZE>; 125 */ 126 static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) 127 { 128 u32 length = fh->fh_size; 129 __be32 *p; 130 131 BUG_ON(length > NFS4_FHSIZE); 132 p = xdr_reserve_space(xdr, 4 + length); 133 xdr_encode_opaque(p, &fh->fh_base, length); 134 } 135 136 /* 137 * stateid4 138 * 139 * struct stateid4 { 140 * uint32_t seqid; 141 * opaque other[12]; 142 * }; 143 */ 144 static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) 145 { 146 __be32 *p; 147 148 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); 149 *p++ = cpu_to_be32(sid->si_generation); 150 xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); 151 } 152 153 /* 154 * sessionid4 155 * 156 * typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; 157 */ 158 static void encode_sessionid4(struct xdr_stream *xdr, 159 const struct nfsd4_session *session) 160 { 161 __be32 *p; 162 163 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); 164 xdr_encode_opaque_fixed(p, session->se_sessionid.data, 165 NFS4_MAX_SESSIONID_LEN); 166 } 167 168 /* 169 * nfsstat4 170 */ 171 static const struct { 172 int stat; 173 int errno; 174 } nfs_cb_errtbl[] = { 175 { NFS4_OK, 0 }, 176 { NFS4ERR_PERM, -EPERM }, 177 { NFS4ERR_NOENT, -ENOENT }, 178 { NFS4ERR_IO, -EIO }, 179 { NFS4ERR_NXIO, -ENXIO }, 180 { NFS4ERR_ACCESS, -EACCES }, 181 { NFS4ERR_EXIST, -EEXIST }, 182 { NFS4ERR_XDEV, -EXDEV }, 183 { NFS4ERR_NOTDIR, -ENOTDIR }, 184 { NFS4ERR_ISDIR, -EISDIR }, 185 { NFS4ERR_INVAL, -EINVAL }, 186 { NFS4ERR_FBIG, -EFBIG }, 187 { NFS4ERR_NOSPC, -ENOSPC }, 188 { NFS4ERR_ROFS, -EROFS }, 189 { NFS4ERR_MLINK, -EMLINK }, 190 { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, 191 { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, 192 { NFS4ERR_DQUOT, -EDQUOT }, 193 { NFS4ERR_STALE, -ESTALE }, 194 { NFS4ERR_BADHANDLE, -EBADHANDLE }, 195 { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, 196 { NFS4ERR_NOTSUPP, -ENOTSUPP }, 197 { NFS4ERR_TOOSMALL, -ETOOSMALL }, 198 { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, 199 { NFS4ERR_BADTYPE, -EBADTYPE }, 200 { NFS4ERR_LOCKED, -EAGAIN }, 201 { NFS4ERR_RESOURCE, -EREMOTEIO }, 202 { NFS4ERR_SYMLINK, -ELOOP }, 203 { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, 204 { NFS4ERR_DEADLOCK, -EDEADLK }, 205 { -1, -EIO } 206 }; 207 208 /* 209 * If we cannot translate the error, the recovery routines should 210 * handle it. 211 * 212 * Note: remaining NFSv4 error codes have values > 10000, so should 213 * not conflict with native Linux error codes. 214 */ 215 static int nfs_cb_stat_to_errno(int status) 216 { 217 int i; 218 219 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { 220 if (nfs_cb_errtbl[i].stat == status) 221 return nfs_cb_errtbl[i].errno; 222 } 223 224 dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); 225 return -status; 226 } 227 228 static int decode_cb_op_status(struct xdr_stream *xdr, 229 enum nfs_cb_opnum4 expected, int *status) 230 { 231 __be32 *p; 232 u32 op; 233 234 p = xdr_inline_decode(xdr, 4 + 4); 235 if (unlikely(p == NULL)) 236 goto out_overflow; 237 op = be32_to_cpup(p++); 238 if (unlikely(op != expected)) 239 goto out_unexpected; 240 *status = nfs_cb_stat_to_errno(be32_to_cpup(p)); 241 return 0; 242 out_overflow: 243 print_overflow_msg(__func__, xdr); 244 return -EIO; 245 out_unexpected: 246 dprintk("NFSD: Callback server returned operation %d but " 247 "we issued a request for %d\n", op, expected); 248 return -EIO; 249 } 250 251 /* 252 * CB_COMPOUND4args 253 * 254 * struct CB_COMPOUND4args { 255 * utf8str_cs tag; 256 * uint32_t minorversion; 257 * uint32_t callback_ident; 258 * nfs_cb_argop4 argarray<>; 259 * }; 260 */ 261 static void encode_cb_compound4args(struct xdr_stream *xdr, 262 struct nfs4_cb_compound_hdr *hdr) 263 { 264 __be32 * p; 265 266 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); 267 p = xdr_encode_empty_array(p); /* empty tag */ 268 *p++ = cpu_to_be32(hdr->minorversion); 269 *p++ = cpu_to_be32(hdr->ident); 270 271 hdr->nops_p = p; 272 *p = cpu_to_be32(hdr->nops); /* argarray element count */ 273 } 274 275 /* 276 * Update argarray element count 277 */ 278 static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) 279 { 280 BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); 281 *hdr->nops_p = cpu_to_be32(hdr->nops); 282 } 283 284 /* 285 * CB_COMPOUND4res 286 * 287 * struct CB_COMPOUND4res { 288 * nfsstat4 status; 289 * utf8str_cs tag; 290 * nfs_cb_resop4 resarray<>; 291 * }; 292 */ 293 static int decode_cb_compound4res(struct xdr_stream *xdr, 294 struct nfs4_cb_compound_hdr *hdr) 295 { 296 u32 length; 297 __be32 *p; 298 299 p = xdr_inline_decode(xdr, 4 + 4); 300 if (unlikely(p == NULL)) 301 goto out_overflow; 302 hdr->status = be32_to_cpup(p++); 303 /* Ignore the tag */ 304 length = be32_to_cpup(p++); 305 p = xdr_inline_decode(xdr, length + 4); 306 if (unlikely(p == NULL)) 307 goto out_overflow; 308 p += XDR_QUADLEN(length); 309 hdr->nops = be32_to_cpup(p); 310 return 0; 311 out_overflow: 312 print_overflow_msg(__func__, xdr); 313 return -EIO; 314 } 315 316 /* 317 * CB_RECALL4args 318 * 319 * struct CB_RECALL4args { 320 * stateid4 stateid; 321 * bool truncate; 322 * nfs_fh4 fh; 323 * }; 324 */ 325 static void encode_cb_recall4args(struct xdr_stream *xdr, 326 const struct nfs4_delegation *dp, 327 struct nfs4_cb_compound_hdr *hdr) 328 { 329 __be32 *p; 330 331 encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); 332 encode_stateid4(xdr, &dp->dl_stid.sc_stateid); 333 334 p = xdr_reserve_space(xdr, 4); 335 *p++ = xdr_zero; /* truncate */ 336 337 encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle); 338 339 hdr->nops++; 340 } 341 342 /* 343 * CB_SEQUENCE4args 344 * 345 * struct CB_SEQUENCE4args { 346 * sessionid4 csa_sessionid; 347 * sequenceid4 csa_sequenceid; 348 * slotid4 csa_slotid; 349 * slotid4 csa_highest_slotid; 350 * bool csa_cachethis; 351 * referring_call_list4 csa_referring_call_lists<>; 352 * }; 353 */ 354 static void encode_cb_sequence4args(struct xdr_stream *xdr, 355 const struct nfsd4_callback *cb, 356 struct nfs4_cb_compound_hdr *hdr) 357 { 358 struct nfsd4_session *session = cb->cb_clp->cl_cb_session; 359 __be32 *p; 360 361 if (hdr->minorversion == 0) 362 return; 363 364 encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); 365 encode_sessionid4(xdr, session); 366 367 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); 368 *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ 369 *p++ = xdr_zero; /* csa_slotid */ 370 *p++ = xdr_zero; /* csa_highest_slotid */ 371 *p++ = xdr_zero; /* csa_cachethis */ 372 xdr_encode_empty_array(p); /* csa_referring_call_lists */ 373 374 hdr->nops++; 375 } 376 377 /* 378 * CB_SEQUENCE4resok 379 * 380 * struct CB_SEQUENCE4resok { 381 * sessionid4 csr_sessionid; 382 * sequenceid4 csr_sequenceid; 383 * slotid4 csr_slotid; 384 * slotid4 csr_highest_slotid; 385 * slotid4 csr_target_highest_slotid; 386 * }; 387 * 388 * union CB_SEQUENCE4res switch (nfsstat4 csr_status) { 389 * case NFS4_OK: 390 * CB_SEQUENCE4resok csr_resok4; 391 * default: 392 * void; 393 * }; 394 * 395 * Our current back channel implmentation supports a single backchannel 396 * with a single slot. 397 */ 398 static int decode_cb_sequence4resok(struct xdr_stream *xdr, 399 struct nfsd4_callback *cb) 400 { 401 struct nfsd4_session *session = cb->cb_clp->cl_cb_session; 402 int status = -ESERVERFAULT; 403 __be32 *p; 404 u32 dummy; 405 406 /* 407 * If the server returns different values for sessionID, slotID or 408 * sequence number, the server is looney tunes. 409 */ 410 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4); 411 if (unlikely(p == NULL)) 412 goto out_overflow; 413 414 if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) { 415 dprintk("NFS: %s Invalid session id\n", __func__); 416 goto out; 417 } 418 p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); 419 420 dummy = be32_to_cpup(p++); 421 if (dummy != session->se_cb_seq_nr) { 422 dprintk("NFS: %s Invalid sequence number\n", __func__); 423 goto out; 424 } 425 426 dummy = be32_to_cpup(p++); 427 if (dummy != 0) { 428 dprintk("NFS: %s Invalid slotid\n", __func__); 429 goto out; 430 } 431 432 /* 433 * FIXME: process highest slotid and target highest slotid 434 */ 435 status = 0; 436 out: 437 cb->cb_seq_status = status; 438 return status; 439 out_overflow: 440 print_overflow_msg(__func__, xdr); 441 status = -EIO; 442 goto out; 443 } 444 445 static int decode_cb_sequence4res(struct xdr_stream *xdr, 446 struct nfsd4_callback *cb) 447 { 448 int status; 449 450 if (cb->cb_clp->cl_minorversion == 0) 451 return 0; 452 453 status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status); 454 if (unlikely(status || cb->cb_seq_status)) 455 return status; 456 457 return decode_cb_sequence4resok(xdr, cb); 458 } 459 460 /* 461 * NFSv4.0 and NFSv4.1 XDR encode functions 462 * 463 * NFSv4.0 callback argument types are defined in section 15 of RFC 464 * 3530: "Network File System (NFS) version 4 Protocol" and section 20 465 * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 466 * Protocol". 467 */ 468 469 /* 470 * NB: Without this zero space reservation, callbacks over krb5p fail 471 */ 472 static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, 473 const void *__unused) 474 { 475 xdr_reserve_space(xdr, 0); 476 } 477 478 /* 479 * 20.2. Operation 4: CB_RECALL - Recall a Delegation 480 */ 481 static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr, 482 const void *data) 483 { 484 const struct nfsd4_callback *cb = data; 485 const struct nfs4_delegation *dp = cb_to_delegation(cb); 486 struct nfs4_cb_compound_hdr hdr = { 487 .ident = cb->cb_clp->cl_cb_ident, 488 .minorversion = cb->cb_clp->cl_minorversion, 489 }; 490 491 encode_cb_compound4args(xdr, &hdr); 492 encode_cb_sequence4args(xdr, cb, &hdr); 493 encode_cb_recall4args(xdr, dp, &hdr); 494 encode_cb_nops(&hdr); 495 } 496 497 498 /* 499 * NFSv4.0 and NFSv4.1 XDR decode functions 500 * 501 * NFSv4.0 callback result types are defined in section 15 of RFC 502 * 3530: "Network File System (NFS) version 4 Protocol" and section 20 503 * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 504 * Protocol". 505 */ 506 507 static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, 508 void *__unused) 509 { 510 return 0; 511 } 512 513 /* 514 * 20.2. Operation 4: CB_RECALL - Recall a Delegation 515 */ 516 static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, 517 struct xdr_stream *xdr, 518 void *data) 519 { 520 struct nfsd4_callback *cb = data; 521 struct nfs4_cb_compound_hdr hdr; 522 int status; 523 524 status = decode_cb_compound4res(xdr, &hdr); 525 if (unlikely(status)) 526 return status; 527 528 if (cb != NULL) { 529 status = decode_cb_sequence4res(xdr, cb); 530 if (unlikely(status || cb->cb_seq_status)) 531 return status; 532 } 533 534 return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status); 535 } 536 537 #ifdef CONFIG_NFSD_PNFS 538 /* 539 * CB_LAYOUTRECALL4args 540 * 541 * struct layoutrecall_file4 { 542 * nfs_fh4 lor_fh; 543 * offset4 lor_offset; 544 * length4 lor_length; 545 * stateid4 lor_stateid; 546 * }; 547 * 548 * union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) { 549 * case LAYOUTRECALL4_FILE: 550 * layoutrecall_file4 lor_layout; 551 * case LAYOUTRECALL4_FSID: 552 * fsid4 lor_fsid; 553 * case LAYOUTRECALL4_ALL: 554 * void; 555 * }; 556 * 557 * struct CB_LAYOUTRECALL4args { 558 * layouttype4 clora_type; 559 * layoutiomode4 clora_iomode; 560 * bool clora_changed; 561 * layoutrecall4 clora_recall; 562 * }; 563 */ 564 static void encode_cb_layout4args(struct xdr_stream *xdr, 565 const struct nfs4_layout_stateid *ls, 566 struct nfs4_cb_compound_hdr *hdr) 567 { 568 __be32 *p; 569 570 BUG_ON(hdr->minorversion == 0); 571 572 p = xdr_reserve_space(xdr, 5 * 4); 573 *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL); 574 *p++ = cpu_to_be32(ls->ls_layout_type); 575 *p++ = cpu_to_be32(IOMODE_ANY); 576 *p++ = cpu_to_be32(1); 577 *p = cpu_to_be32(RETURN_FILE); 578 579 encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle); 580 581 p = xdr_reserve_space(xdr, 2 * 8); 582 p = xdr_encode_hyper(p, 0); 583 xdr_encode_hyper(p, NFS4_MAX_UINT64); 584 585 encode_stateid4(xdr, &ls->ls_recall_sid); 586 587 hdr->nops++; 588 } 589 590 static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req, 591 struct xdr_stream *xdr, 592 const void *data) 593 { 594 const struct nfsd4_callback *cb = data; 595 const struct nfs4_layout_stateid *ls = 596 container_of(cb, struct nfs4_layout_stateid, ls_recall); 597 struct nfs4_cb_compound_hdr hdr = { 598 .ident = 0, 599 .minorversion = cb->cb_clp->cl_minorversion, 600 }; 601 602 encode_cb_compound4args(xdr, &hdr); 603 encode_cb_sequence4args(xdr, cb, &hdr); 604 encode_cb_layout4args(xdr, ls, &hdr); 605 encode_cb_nops(&hdr); 606 } 607 608 static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp, 609 struct xdr_stream *xdr, 610 void *data) 611 { 612 struct nfsd4_callback *cb = data; 613 struct nfs4_cb_compound_hdr hdr; 614 int status; 615 616 status = decode_cb_compound4res(xdr, &hdr); 617 if (unlikely(status)) 618 return status; 619 620 if (cb) { 621 status = decode_cb_sequence4res(xdr, cb); 622 if (unlikely(status || cb->cb_seq_status)) 623 return status; 624 } 625 return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status); 626 } 627 #endif /* CONFIG_NFSD_PNFS */ 628 629 static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so) 630 { 631 __be32 *p; 632 633 p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len); 634 p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8); 635 xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len); 636 } 637 638 static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req, 639 struct xdr_stream *xdr, 640 const void *data) 641 { 642 const struct nfsd4_callback *cb = data; 643 const struct nfsd4_blocked_lock *nbl = 644 container_of(cb, struct nfsd4_blocked_lock, nbl_cb); 645 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner; 646 struct nfs4_cb_compound_hdr hdr = { 647 .ident = 0, 648 .minorversion = cb->cb_clp->cl_minorversion, 649 }; 650 651 __be32 *p; 652 653 BUG_ON(hdr.minorversion == 0); 654 655 encode_cb_compound4args(xdr, &hdr); 656 encode_cb_sequence4args(xdr, cb, &hdr); 657 658 p = xdr_reserve_space(xdr, 4); 659 *p = cpu_to_be32(OP_CB_NOTIFY_LOCK); 660 encode_nfs_fh4(xdr, &nbl->nbl_fh); 661 encode_stateowner(xdr, &lo->lo_owner); 662 hdr.nops++; 663 664 encode_cb_nops(&hdr); 665 } 666 667 static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp, 668 struct xdr_stream *xdr, 669 void *data) 670 { 671 struct nfsd4_callback *cb = data; 672 struct nfs4_cb_compound_hdr hdr; 673 int status; 674 675 status = decode_cb_compound4res(xdr, &hdr); 676 if (unlikely(status)) 677 return status; 678 679 if (cb) { 680 status = decode_cb_sequence4res(xdr, cb); 681 if (unlikely(status || cb->cb_seq_status)) 682 return status; 683 } 684 return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status); 685 } 686 687 /* 688 * struct write_response4 { 689 * stateid4 wr_callback_id<1>; 690 * length4 wr_count; 691 * stable_how4 wr_committed; 692 * verifier4 wr_writeverf; 693 * }; 694 * union offload_info4 switch (nfsstat4 coa_status) { 695 * case NFS4_OK: 696 * write_response4 coa_resok4; 697 * default: 698 * length4 coa_bytes_copied; 699 * }; 700 * struct CB_OFFLOAD4args { 701 * nfs_fh4 coa_fh; 702 * stateid4 coa_stateid; 703 * offload_info4 coa_offload_info; 704 * }; 705 */ 706 static void encode_offload_info4(struct xdr_stream *xdr, 707 __be32 nfserr, 708 const struct nfsd4_copy *cp) 709 { 710 __be32 *p; 711 712 p = xdr_reserve_space(xdr, 4); 713 *p++ = nfserr; 714 if (!nfserr) { 715 p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE); 716 p = xdr_encode_empty_array(p); 717 p = xdr_encode_hyper(p, cp->cp_res.wr_bytes_written); 718 *p++ = cpu_to_be32(cp->cp_res.wr_stable_how); 719 p = xdr_encode_opaque_fixed(p, cp->cp_res.wr_verifier.data, 720 NFS4_VERIFIER_SIZE); 721 } else { 722 p = xdr_reserve_space(xdr, 8); 723 /* We always return success if bytes were written */ 724 p = xdr_encode_hyper(p, 0); 725 } 726 } 727 728 static void encode_cb_offload4args(struct xdr_stream *xdr, 729 __be32 nfserr, 730 const struct knfsd_fh *fh, 731 const struct nfsd4_copy *cp, 732 struct nfs4_cb_compound_hdr *hdr) 733 { 734 __be32 *p; 735 736 p = xdr_reserve_space(xdr, 4); 737 *p++ = cpu_to_be32(OP_CB_OFFLOAD); 738 encode_nfs_fh4(xdr, fh); 739 encode_stateid4(xdr, &cp->cp_res.cb_stateid); 740 encode_offload_info4(xdr, nfserr, cp); 741 742 hdr->nops++; 743 } 744 745 static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req, 746 struct xdr_stream *xdr, 747 const void *data) 748 { 749 const struct nfsd4_callback *cb = data; 750 const struct nfsd4_copy *cp = 751 container_of(cb, struct nfsd4_copy, cp_cb); 752 struct nfs4_cb_compound_hdr hdr = { 753 .ident = 0, 754 .minorversion = cb->cb_clp->cl_minorversion, 755 }; 756 757 encode_cb_compound4args(xdr, &hdr); 758 encode_cb_sequence4args(xdr, cb, &hdr); 759 encode_cb_offload4args(xdr, cp->nfserr, &cp->fh, cp, &hdr); 760 encode_cb_nops(&hdr); 761 } 762 763 static int nfs4_xdr_dec_cb_offload(struct rpc_rqst *rqstp, 764 struct xdr_stream *xdr, 765 void *data) 766 { 767 struct nfsd4_callback *cb = data; 768 struct nfs4_cb_compound_hdr hdr; 769 int status; 770 771 status = decode_cb_compound4res(xdr, &hdr); 772 if (unlikely(status)) 773 return status; 774 775 if (cb) { 776 status = decode_cb_sequence4res(xdr, cb); 777 if (unlikely(status || cb->cb_seq_status)) 778 return status; 779 } 780 return decode_cb_op_status(xdr, OP_CB_OFFLOAD, &cb->cb_status); 781 } 782 /* 783 * RPC procedure tables 784 */ 785 #define PROC(proc, call, argtype, restype) \ 786 [NFSPROC4_CLNT_##proc] = { \ 787 .p_proc = NFSPROC4_CB_##call, \ 788 .p_encode = nfs4_xdr_enc_##argtype, \ 789 .p_decode = nfs4_xdr_dec_##restype, \ 790 .p_arglen = NFS4_enc_##argtype##_sz, \ 791 .p_replen = NFS4_dec_##restype##_sz, \ 792 .p_statidx = NFSPROC4_CB_##call, \ 793 .p_name = #proc, \ 794 } 795 796 static const struct rpc_procinfo nfs4_cb_procedures[] = { 797 PROC(CB_NULL, NULL, cb_null, cb_null), 798 PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), 799 #ifdef CONFIG_NFSD_PNFS 800 PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout), 801 #endif 802 PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock), 803 PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload), 804 }; 805 806 static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)]; 807 static const struct rpc_version nfs_cb_version4 = { 808 /* 809 * Note on the callback rpc program version number: despite language in rfc 810 * 5661 section 18.36.3 requiring servers to use 4 in this field, the 811 * official xdr descriptions for both 4.0 and 4.1 specify version 1, and 812 * in practice that appears to be what implementations use. The section 813 * 18.36.3 language is expected to be fixed in an erratum. 814 */ 815 .number = 1, 816 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), 817 .procs = nfs4_cb_procedures, 818 .counts = nfs4_cb_counts, 819 }; 820 821 static const struct rpc_version *nfs_cb_version[2] = { 822 [1] = &nfs_cb_version4, 823 }; 824 825 static const struct rpc_program cb_program; 826 827 static struct rpc_stat cb_stats = { 828 .program = &cb_program 829 }; 830 831 #define NFS4_CALLBACK 0x40000000 832 static const struct rpc_program cb_program = { 833 .name = "nfs4_cb", 834 .number = NFS4_CALLBACK, 835 .nrvers = ARRAY_SIZE(nfs_cb_version), 836 .version = nfs_cb_version, 837 .stats = &cb_stats, 838 .pipe_dir_name = "nfsd4_cb", 839 }; 840 841 static int max_cb_time(struct net *net) 842 { 843 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 844 return max(nn->nfsd4_lease/10, (time_t)1) * HZ; 845 } 846 847 static const struct cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses) 848 { 849 if (clp->cl_minorversion == 0) { 850 client->cl_principal = clp->cl_cred.cr_targ_princ ? 851 clp->cl_cred.cr_targ_princ : "nfs"; 852 853 return get_cred(rpc_machine_cred()); 854 } else { 855 struct cred *kcred; 856 857 kcred = prepare_kernel_cred(NULL); 858 if (!kcred) 859 return NULL; 860 861 kcred->uid = ses->se_cb_sec.uid; 862 kcred->gid = ses->se_cb_sec.gid; 863 return kcred; 864 } 865 } 866 867 static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) 868 { 869 int maxtime = max_cb_time(clp->net); 870 struct rpc_timeout timeparms = { 871 .to_initval = maxtime, 872 .to_retries = 0, 873 .to_maxval = maxtime, 874 }; 875 struct rpc_create_args args = { 876 .net = clp->net, 877 .address = (struct sockaddr *) &conn->cb_addr, 878 .addrsize = conn->cb_addrlen, 879 .saddress = (struct sockaddr *) &conn->cb_saddr, 880 .timeout = &timeparms, 881 .program = &cb_program, 882 .version = 1, 883 .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), 884 }; 885 struct rpc_clnt *client; 886 const struct cred *cred; 887 888 if (clp->cl_minorversion == 0) { 889 if (!clp->cl_cred.cr_principal && 890 (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5)) 891 return -EINVAL; 892 args.client_name = clp->cl_cred.cr_principal; 893 args.prognumber = conn->cb_prog; 894 args.protocol = XPRT_TRANSPORT_TCP; 895 args.authflavor = clp->cl_cred.cr_flavor; 896 clp->cl_cb_ident = conn->cb_ident; 897 } else { 898 if (!conn->cb_xprt) 899 return -EINVAL; 900 clp->cl_cb_conn.cb_xprt = conn->cb_xprt; 901 clp->cl_cb_session = ses; 902 args.bc_xprt = conn->cb_xprt; 903 args.prognumber = clp->cl_cb_session->se_cb_prog; 904 args.protocol = conn->cb_xprt->xpt_class->xcl_ident | 905 XPRT_TRANSPORT_BC; 906 args.authflavor = ses->se_cb_sec.flavor; 907 } 908 /* Create RPC client */ 909 client = rpc_create(&args); 910 if (IS_ERR(client)) { 911 dprintk("NFSD: couldn't create callback client: %ld\n", 912 PTR_ERR(client)); 913 return PTR_ERR(client); 914 } 915 cred = get_backchannel_cred(clp, client, ses); 916 if (IS_ERR(cred)) { 917 rpc_shutdown_client(client); 918 return PTR_ERR(cred); 919 } 920 clp->cl_cb_client = client; 921 clp->cl_cb_cred = cred; 922 return 0; 923 } 924 925 static void warn_no_callback_path(struct nfs4_client *clp, int reason) 926 { 927 dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", 928 (int)clp->cl_name.len, clp->cl_name.data, reason); 929 } 930 931 static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason) 932 { 933 if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags)) 934 return; 935 clp->cl_cb_state = NFSD4_CB_DOWN; 936 warn_no_callback_path(clp, reason); 937 } 938 939 static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason) 940 { 941 if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags)) 942 return; 943 clp->cl_cb_state = NFSD4_CB_FAULT; 944 warn_no_callback_path(clp, reason); 945 } 946 947 static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) 948 { 949 struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); 950 951 if (task->tk_status) 952 nfsd4_mark_cb_down(clp, task->tk_status); 953 else 954 clp->cl_cb_state = NFSD4_CB_UP; 955 } 956 957 static const struct rpc_call_ops nfsd4_cb_probe_ops = { 958 /* XXX: release method to ensure we set the cb channel down if 959 * necessary on early failure? */ 960 .rpc_call_done = nfsd4_cb_probe_done, 961 }; 962 963 static struct workqueue_struct *callback_wq; 964 965 /* 966 * Poke the callback thread to process any updates to the callback 967 * parameters, and send a null probe. 968 */ 969 void nfsd4_probe_callback(struct nfs4_client *clp) 970 { 971 clp->cl_cb_state = NFSD4_CB_UNKNOWN; 972 set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); 973 nfsd4_run_cb(&clp->cl_cb_null); 974 } 975 976 void nfsd4_probe_callback_sync(struct nfs4_client *clp) 977 { 978 nfsd4_probe_callback(clp); 979 flush_workqueue(callback_wq); 980 } 981 982 void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) 983 { 984 clp->cl_cb_state = NFSD4_CB_UNKNOWN; 985 spin_lock(&clp->cl_lock); 986 memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); 987 spin_unlock(&clp->cl_lock); 988 } 989 990 /* 991 * There's currently a single callback channel slot. 992 * If the slot is available, then mark it busy. Otherwise, set the 993 * thread for sleeping on the callback RPC wait queue. 994 */ 995 static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task) 996 { 997 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { 998 rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); 999 /* Race breaker */ 1000 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { 1001 dprintk("%s slot is busy\n", __func__); 1002 return false; 1003 } 1004 rpc_wake_up_queued_task(&clp->cl_cb_waitq, task); 1005 } 1006 return true; 1007 } 1008 1009 /* 1010 * TODO: cb_sequence should support referring call lists, cachethis, multiple 1011 * slots, and mark callback channel down on communication errors. 1012 */ 1013 static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) 1014 { 1015 struct nfsd4_callback *cb = calldata; 1016 struct nfs4_client *clp = cb->cb_clp; 1017 u32 minorversion = clp->cl_minorversion; 1018 1019 /* 1020 * cb_seq_status is only set in decode_cb_sequence4res, 1021 * and so will remain 1 if an rpc level failure occurs. 1022 */ 1023 cb->cb_seq_status = 1; 1024 cb->cb_status = 0; 1025 if (minorversion) { 1026 if (!nfsd41_cb_get_slot(clp, task)) 1027 return; 1028 } 1029 rpc_call_start(task); 1030 } 1031 1032 static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb) 1033 { 1034 struct nfs4_client *clp = cb->cb_clp; 1035 struct nfsd4_session *session = clp->cl_cb_session; 1036 bool ret = true; 1037 1038 if (!clp->cl_minorversion) { 1039 /* 1040 * If the backchannel connection was shut down while this 1041 * task was queued, we need to resubmit it after setting up 1042 * a new backchannel connection. 1043 * 1044 * Note that if we lost our callback connection permanently 1045 * the submission code will error out, so we don't need to 1046 * handle that case here. 1047 */ 1048 if (task->tk_flags & RPC_TASK_KILLED) 1049 goto need_restart; 1050 1051 return true; 1052 } 1053 1054 switch (cb->cb_seq_status) { 1055 case 0: 1056 /* 1057 * No need for lock, access serialized in nfsd4_cb_prepare 1058 * 1059 * RFC5661 20.9.3 1060 * If CB_SEQUENCE returns an error, then the state of the slot 1061 * (sequence ID, cached reply) MUST NOT change. 1062 */ 1063 ++session->se_cb_seq_nr; 1064 break; 1065 case -ESERVERFAULT: 1066 ++session->se_cb_seq_nr; 1067 /* Fall through */ 1068 case 1: 1069 case -NFS4ERR_BADSESSION: 1070 nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status); 1071 ret = false; 1072 break; 1073 case -NFS4ERR_DELAY: 1074 if (!rpc_restart_call(task)) 1075 goto out; 1076 1077 rpc_delay(task, 2 * HZ); 1078 return false; 1079 case -NFS4ERR_BADSLOT: 1080 goto retry_nowait; 1081 case -NFS4ERR_SEQ_MISORDERED: 1082 if (session->se_cb_seq_nr != 1) { 1083 session->se_cb_seq_nr = 1; 1084 goto retry_nowait; 1085 } 1086 break; 1087 default: 1088 dprintk("%s: unprocessed error %d\n", __func__, 1089 cb->cb_seq_status); 1090 } 1091 1092 clear_bit(0, &clp->cl_cb_slot_busy); 1093 rpc_wake_up_next(&clp->cl_cb_waitq); 1094 dprintk("%s: freed slot, new seqid=%d\n", __func__, 1095 clp->cl_cb_session->se_cb_seq_nr); 1096 1097 if (task->tk_flags & RPC_TASK_KILLED) 1098 goto need_restart; 1099 out: 1100 return ret; 1101 retry_nowait: 1102 if (rpc_restart_call_prepare(task)) 1103 ret = false; 1104 goto out; 1105 need_restart: 1106 task->tk_status = 0; 1107 cb->cb_need_restart = true; 1108 return false; 1109 } 1110 1111 static void nfsd4_cb_done(struct rpc_task *task, void *calldata) 1112 { 1113 struct nfsd4_callback *cb = calldata; 1114 struct nfs4_client *clp = cb->cb_clp; 1115 1116 dprintk("%s: minorversion=%d\n", __func__, 1117 clp->cl_minorversion); 1118 1119 if (!nfsd4_cb_sequence_done(task, cb)) 1120 return; 1121 1122 if (cb->cb_status) { 1123 WARN_ON_ONCE(task->tk_status); 1124 task->tk_status = cb->cb_status; 1125 } 1126 1127 switch (cb->cb_ops->done(cb, task)) { 1128 case 0: 1129 task->tk_status = 0; 1130 rpc_restart_call_prepare(task); 1131 return; 1132 case 1: 1133 break; 1134 case -1: 1135 /* Network partition? */ 1136 nfsd4_mark_cb_down(clp, task->tk_status); 1137 break; 1138 default: 1139 BUG(); 1140 } 1141 } 1142 1143 static void nfsd4_cb_release(void *calldata) 1144 { 1145 struct nfsd4_callback *cb = calldata; 1146 1147 if (cb->cb_need_restart) 1148 nfsd4_run_cb(cb); 1149 else 1150 cb->cb_ops->release(cb); 1151 1152 } 1153 1154 static const struct rpc_call_ops nfsd4_cb_ops = { 1155 .rpc_call_prepare = nfsd4_cb_prepare, 1156 .rpc_call_done = nfsd4_cb_done, 1157 .rpc_release = nfsd4_cb_release, 1158 }; 1159 1160 int nfsd4_create_callback_queue(void) 1161 { 1162 callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0); 1163 if (!callback_wq) 1164 return -ENOMEM; 1165 return 0; 1166 } 1167 1168 void nfsd4_destroy_callback_queue(void) 1169 { 1170 destroy_workqueue(callback_wq); 1171 } 1172 1173 /* must be called under the state lock */ 1174 void nfsd4_shutdown_callback(struct nfs4_client *clp) 1175 { 1176 set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags); 1177 /* 1178 * Note this won't actually result in a null callback; 1179 * instead, nfsd4_run_cb_null() will detect the killed 1180 * client, destroy the rpc client, and stop: 1181 */ 1182 nfsd4_run_cb(&clp->cl_cb_null); 1183 flush_workqueue(callback_wq); 1184 } 1185 1186 /* requires cl_lock: */ 1187 static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp) 1188 { 1189 struct nfsd4_session *s; 1190 struct nfsd4_conn *c; 1191 1192 list_for_each_entry(s, &clp->cl_sessions, se_perclnt) { 1193 list_for_each_entry(c, &s->se_conns, cn_persession) { 1194 if (c->cn_flags & NFS4_CDFC4_BACK) 1195 return c; 1196 } 1197 } 1198 return NULL; 1199 } 1200 1201 static void nfsd4_process_cb_update(struct nfsd4_callback *cb) 1202 { 1203 struct nfs4_cb_conn conn; 1204 struct nfs4_client *clp = cb->cb_clp; 1205 struct nfsd4_session *ses = NULL; 1206 struct nfsd4_conn *c; 1207 int err; 1208 1209 /* 1210 * This is either an update, or the client dying; in either case, 1211 * kill the old client: 1212 */ 1213 if (clp->cl_cb_client) { 1214 rpc_shutdown_client(clp->cl_cb_client); 1215 clp->cl_cb_client = NULL; 1216 put_cred(clp->cl_cb_cred); 1217 clp->cl_cb_cred = NULL; 1218 } 1219 if (clp->cl_cb_conn.cb_xprt) { 1220 svc_xprt_put(clp->cl_cb_conn.cb_xprt); 1221 clp->cl_cb_conn.cb_xprt = NULL; 1222 } 1223 if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) 1224 return; 1225 spin_lock(&clp->cl_lock); 1226 /* 1227 * Only serialized callback code is allowed to clear these 1228 * flags; main nfsd code can only set them: 1229 */ 1230 BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)); 1231 clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); 1232 memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); 1233 c = __nfsd4_find_backchannel(clp); 1234 if (c) { 1235 svc_xprt_get(c->cn_xprt); 1236 conn.cb_xprt = c->cn_xprt; 1237 ses = c->cn_session; 1238 } 1239 spin_unlock(&clp->cl_lock); 1240 1241 err = setup_callback_client(clp, &conn, ses); 1242 if (err) { 1243 nfsd4_mark_cb_down(clp, err); 1244 return; 1245 } 1246 } 1247 1248 static void 1249 nfsd4_run_cb_work(struct work_struct *work) 1250 { 1251 struct nfsd4_callback *cb = 1252 container_of(work, struct nfsd4_callback, cb_work); 1253 struct nfs4_client *clp = cb->cb_clp; 1254 struct rpc_clnt *clnt; 1255 1256 if (cb->cb_need_restart) { 1257 cb->cb_need_restart = false; 1258 } else { 1259 if (cb->cb_ops && cb->cb_ops->prepare) 1260 cb->cb_ops->prepare(cb); 1261 } 1262 1263 if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK) 1264 nfsd4_process_cb_update(cb); 1265 1266 clnt = clp->cl_cb_client; 1267 if (!clnt) { 1268 /* Callback channel broken, or client killed; give up: */ 1269 if (cb->cb_ops && cb->cb_ops->release) 1270 cb->cb_ops->release(cb); 1271 return; 1272 } 1273 1274 /* 1275 * Don't send probe messages for 4.1 or later. 1276 */ 1277 if (!cb->cb_ops && clp->cl_minorversion) { 1278 clp->cl_cb_state = NFSD4_CB_UP; 1279 return; 1280 } 1281 1282 cb->cb_msg.rpc_cred = clp->cl_cb_cred; 1283 rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN, 1284 cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb); 1285 } 1286 1287 void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp, 1288 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op) 1289 { 1290 cb->cb_clp = clp; 1291 cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op]; 1292 cb->cb_msg.rpc_argp = cb; 1293 cb->cb_msg.rpc_resp = cb; 1294 cb->cb_ops = ops; 1295 INIT_WORK(&cb->cb_work, nfsd4_run_cb_work); 1296 cb->cb_seq_status = 1; 1297 cb->cb_status = 0; 1298 cb->cb_need_restart = false; 1299 } 1300 1301 void nfsd4_run_cb(struct nfsd4_callback *cb) 1302 { 1303 queue_work(callback_wq, &cb->cb_work); 1304 } 1305