1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/nfs/callback_proc.c 4 * 5 * Copyright (C) 2004 Trond Myklebust 6 * 7 * NFSv4 callback procedures 8 */ 9 #include <linux/nfs4.h> 10 #include <linux/nfs_fs.h> 11 #include <linux/slab.h> 12 #include <linux/rcupdate.h> 13 #include "nfs4_fs.h" 14 #include "callback.h" 15 #include "delegation.h" 16 #include "internal.h" 17 #include "pnfs.h" 18 #include "nfs4session.h" 19 #include "nfs4trace.h" 20 21 #define NFSDBG_FACILITY NFSDBG_CALLBACK 22 23 __be32 nfs4_callback_getattr(void *argp, void *resp, 24 struct cb_process_state *cps) 25 { 26 struct cb_getattrargs *args = argp; 27 struct cb_getattrres *res = resp; 28 struct nfs_delegation *delegation; 29 struct inode *inode; 30 31 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 32 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 33 goto out; 34 35 res->bitmap[0] = res->bitmap[1] = 0; 36 res->status = htonl(NFS4ERR_BADHANDLE); 37 38 dprintk_rcu("NFS: GETATTR callback request from %s\n", 39 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 40 41 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 42 if (IS_ERR(inode)) { 43 if (inode == ERR_PTR(-EAGAIN)) 44 res->status = htonl(NFS4ERR_DELAY); 45 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL, 46 -ntohl(res->status)); 47 goto out; 48 } 49 rcu_read_lock(); 50 delegation = nfs4_get_valid_delegation(inode); 51 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0) 52 goto out_iput; 53 res->size = i_size_read(inode); 54 res->change_attr = delegation->change_attr; 55 if (nfs_have_writebacks(inode)) 56 res->change_attr++; 57 res->ctime = inode->i_ctime; 58 res->mtime = inode->i_mtime; 59 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) & 60 args->bitmap[0]; 61 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) & 62 args->bitmap[1]; 63 res->status = 0; 64 out_iput: 65 rcu_read_unlock(); 66 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status)); 67 nfs_iput_and_deactive(inode); 68 out: 69 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); 70 return res->status; 71 } 72 73 __be32 nfs4_callback_recall(void *argp, void *resp, 74 struct cb_process_state *cps) 75 { 76 struct cb_recallargs *args = argp; 77 struct inode *inode; 78 __be32 res; 79 80 res = htonl(NFS4ERR_OP_NOT_IN_SESSION); 81 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 82 goto out; 83 84 dprintk_rcu("NFS: RECALL callback request from %s\n", 85 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 86 87 res = htonl(NFS4ERR_BADHANDLE); 88 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 89 if (IS_ERR(inode)) { 90 if (inode == ERR_PTR(-EAGAIN)) 91 res = htonl(NFS4ERR_DELAY); 92 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL, 93 &args->stateid, -ntohl(res)); 94 goto out; 95 } 96 /* Set up a helper thread to actually return the delegation */ 97 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { 98 case 0: 99 res = 0; 100 break; 101 case -ENOENT: 102 res = htonl(NFS4ERR_BAD_STATEID); 103 break; 104 default: 105 res = htonl(NFS4ERR_RESOURCE); 106 } 107 trace_nfs4_cb_recall(cps->clp, &args->fh, inode, 108 &args->stateid, -ntohl(res)); 109 nfs_iput_and_deactive(inode); 110 out: 111 dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); 112 return res; 113 } 114 115 #if defined(CONFIG_NFS_V4_1) 116 117 /* 118 * Lookup a layout inode by stateid 119 * 120 * Note: returns a refcount on the inode and superblock 121 */ 122 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp, 123 const nfs4_stateid *stateid) 124 { 125 struct nfs_server *server; 126 struct inode *inode; 127 struct pnfs_layout_hdr *lo; 128 129 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 130 list_for_each_entry(lo, &server->layouts, plh_layouts) { 131 if (stateid != NULL && 132 !nfs4_stateid_match_other(stateid, &lo->plh_stateid)) 133 continue; 134 inode = igrab(lo->plh_inode); 135 if (!inode) 136 return ERR_PTR(-EAGAIN); 137 if (!nfs_sb_active(inode->i_sb)) { 138 rcu_read_unlock(); 139 spin_unlock(&clp->cl_lock); 140 iput(inode); 141 spin_lock(&clp->cl_lock); 142 rcu_read_lock(); 143 return ERR_PTR(-EAGAIN); 144 } 145 return inode; 146 } 147 } 148 149 return ERR_PTR(-ENOENT); 150 } 151 152 /* 153 * Lookup a layout inode by filehandle. 154 * 155 * Note: returns a refcount on the inode and superblock 156 * 157 */ 158 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp, 159 const struct nfs_fh *fh) 160 { 161 struct nfs_server *server; 162 struct nfs_inode *nfsi; 163 struct inode *inode; 164 struct pnfs_layout_hdr *lo; 165 166 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 167 list_for_each_entry(lo, &server->layouts, plh_layouts) { 168 nfsi = NFS_I(lo->plh_inode); 169 if (nfs_compare_fh(fh, &nfsi->fh)) 170 continue; 171 if (nfsi->layout != lo) 172 continue; 173 inode = igrab(lo->plh_inode); 174 if (!inode) 175 return ERR_PTR(-EAGAIN); 176 if (!nfs_sb_active(inode->i_sb)) { 177 rcu_read_unlock(); 178 spin_unlock(&clp->cl_lock); 179 iput(inode); 180 spin_lock(&clp->cl_lock); 181 rcu_read_lock(); 182 return ERR_PTR(-EAGAIN); 183 } 184 return inode; 185 } 186 } 187 188 return ERR_PTR(-ENOENT); 189 } 190 191 static struct inode *nfs_layout_find_inode(struct nfs_client *clp, 192 const struct nfs_fh *fh, 193 const nfs4_stateid *stateid) 194 { 195 struct inode *inode; 196 197 spin_lock(&clp->cl_lock); 198 rcu_read_lock(); 199 inode = nfs_layout_find_inode_by_stateid(clp, stateid); 200 if (inode == ERR_PTR(-ENOENT)) 201 inode = nfs_layout_find_inode_by_fh(clp, fh); 202 rcu_read_unlock(); 203 spin_unlock(&clp->cl_lock); 204 205 return inode; 206 } 207 208 /* 209 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing) 210 */ 211 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo, 212 const nfs4_stateid *new) 213 { 214 u32 oldseq, newseq; 215 216 /* Is the stateid not initialised? */ 217 if (!pnfs_layout_is_valid(lo)) 218 return NFS4ERR_NOMATCHING_LAYOUT; 219 220 /* Mismatched stateid? */ 221 if (!nfs4_stateid_match_other(&lo->plh_stateid, new)) 222 return NFS4ERR_BAD_STATEID; 223 224 newseq = be32_to_cpu(new->seqid); 225 /* Are we already in a layout recall situation? */ 226 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && 227 lo->plh_return_seq != 0) { 228 if (newseq < lo->plh_return_seq) 229 return NFS4ERR_OLD_STATEID; 230 if (newseq > lo->plh_return_seq) 231 return NFS4ERR_DELAY; 232 goto out; 233 } 234 235 /* Check that the stateid matches what we think it should be. */ 236 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 237 if (newseq > oldseq + 1) 238 return NFS4ERR_DELAY; 239 /* Crazy server! */ 240 if (newseq <= oldseq) 241 return NFS4ERR_OLD_STATEID; 242 out: 243 return NFS_OK; 244 } 245 246 static u32 initiate_file_draining(struct nfs_client *clp, 247 struct cb_layoutrecallargs *args) 248 { 249 struct inode *ino; 250 struct pnfs_layout_hdr *lo; 251 u32 rv = NFS4ERR_NOMATCHING_LAYOUT; 252 LIST_HEAD(free_me_list); 253 254 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid); 255 if (IS_ERR(ino)) { 256 if (ino == ERR_PTR(-EAGAIN)) 257 rv = NFS4ERR_DELAY; 258 goto out_noput; 259 } 260 261 pnfs_layoutcommit_inode(ino, false); 262 263 264 spin_lock(&ino->i_lock); 265 lo = NFS_I(ino)->layout; 266 if (!lo) { 267 spin_unlock(&ino->i_lock); 268 goto out; 269 } 270 pnfs_get_layout_hdr(lo); 271 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid); 272 if (rv != NFS_OK) 273 goto unlock; 274 275 /* 276 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return) 277 */ 278 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 279 rv = NFS4ERR_DELAY; 280 goto unlock; 281 } 282 283 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true); 284 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list, 285 &args->cbl_range, 286 be32_to_cpu(args->cbl_stateid.seqid))) { 287 case 0: 288 case -EBUSY: 289 /* There are layout segments that need to be returned */ 290 rv = NFS4_OK; 291 break; 292 case -ENOENT: 293 /* Embrace your forgetfulness! */ 294 rv = NFS4ERR_NOMATCHING_LAYOUT; 295 296 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 297 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, 298 &args->cbl_range); 299 } 300 } 301 unlock: 302 spin_unlock(&ino->i_lock); 303 pnfs_free_lseg_list(&free_me_list); 304 /* Free all lsegs that are attached to commit buckets */ 305 nfs_commit_inode(ino, 0); 306 pnfs_put_layout_hdr(lo); 307 out: 308 nfs_iput_and_deactive(ino); 309 out_noput: 310 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino, 311 &args->cbl_stateid, -rv); 312 return rv; 313 } 314 315 static u32 initiate_bulk_draining(struct nfs_client *clp, 316 struct cb_layoutrecallargs *args) 317 { 318 int stat; 319 320 if (args->cbl_recall_type == RETURN_FSID) 321 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true); 322 else 323 stat = pnfs_destroy_layouts_byclid(clp, true); 324 if (stat != 0) 325 return NFS4ERR_DELAY; 326 return NFS4ERR_NOMATCHING_LAYOUT; 327 } 328 329 static u32 do_callback_layoutrecall(struct nfs_client *clp, 330 struct cb_layoutrecallargs *args) 331 { 332 if (args->cbl_recall_type == RETURN_FILE) 333 return initiate_file_draining(clp, args); 334 return initiate_bulk_draining(clp, args); 335 } 336 337 __be32 nfs4_callback_layoutrecall(void *argp, void *resp, 338 struct cb_process_state *cps) 339 { 340 struct cb_layoutrecallargs *args = argp; 341 u32 res = NFS4ERR_OP_NOT_IN_SESSION; 342 343 if (cps->clp) 344 res = do_callback_layoutrecall(cps->clp, args); 345 return cpu_to_be32(res); 346 } 347 348 static void pnfs_recall_all_layouts(struct nfs_client *clp) 349 { 350 struct cb_layoutrecallargs args; 351 352 /* Pretend we got a CB_LAYOUTRECALL(ALL) */ 353 memset(&args, 0, sizeof(args)); 354 args.cbl_recall_type = RETURN_ALL; 355 /* FIXME we ignore errors, what should we do? */ 356 do_callback_layoutrecall(clp, &args); 357 } 358 359 __be32 nfs4_callback_devicenotify(void *argp, void *resp, 360 struct cb_process_state *cps) 361 { 362 struct cb_devicenotifyargs *args = argp; 363 int i; 364 __be32 res = 0; 365 struct nfs_client *clp = cps->clp; 366 struct nfs_server *server = NULL; 367 368 if (!clp) { 369 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 370 goto out; 371 } 372 373 for (i = 0; i < args->ndevs; i++) { 374 struct cb_devicenotifyitem *dev = &args->devs[i]; 375 376 if (!server || 377 server->pnfs_curr_ld->id != dev->cbd_layout_type) { 378 rcu_read_lock(); 379 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) 380 if (server->pnfs_curr_ld && 381 server->pnfs_curr_ld->id == dev->cbd_layout_type) { 382 rcu_read_unlock(); 383 goto found; 384 } 385 rcu_read_unlock(); 386 continue; 387 } 388 389 found: 390 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id); 391 } 392 393 out: 394 kfree(args->devs); 395 return res; 396 } 397 398 /* 399 * Validate the sequenceID sent by the server. 400 * Return success if the sequenceID is one more than what we last saw on 401 * this slot, accounting for wraparound. Increments the slot's sequence. 402 * 403 * We don't yet implement a duplicate request cache, instead we set the 404 * back channel ca_maxresponsesize_cached to zero. This is OK for now 405 * since we only currently implement idempotent callbacks anyway. 406 * 407 * We have a single slot backchannel at this time, so we don't bother 408 * checking the used_slots bit array on the table. The lower layer guarantees 409 * a single outstanding callback request at a time. 410 */ 411 static __be32 412 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, 413 const struct cb_sequenceargs * args) 414 { 415 __be32 ret; 416 417 ret = cpu_to_be32(NFS4ERR_BADSLOT); 418 if (args->csa_slotid > tbl->server_highest_slotid) 419 goto out_err; 420 421 /* Replay */ 422 if (args->csa_sequenceid == slot->seq_nr) { 423 ret = cpu_to_be32(NFS4ERR_DELAY); 424 if (nfs4_test_locked_slot(tbl, slot->slot_nr)) 425 goto out_err; 426 427 /* Signal process_op to set this error on next op */ 428 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP); 429 if (args->csa_cachethis == 0) 430 goto out_err; 431 432 /* Liar! We never allowed you to set csa_cachethis != 0 */ 433 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY); 434 goto out_err; 435 } 436 437 /* Note: wraparound relies on seq_nr being of type u32 */ 438 /* Misordered request */ 439 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED); 440 if (args->csa_sequenceid != slot->seq_nr + 1) 441 goto out_err; 442 443 return cpu_to_be32(NFS4_OK); 444 445 out_err: 446 trace_nfs4_cb_seqid_err(args, ret); 447 return ret; 448 } 449 450 /* 451 * For each referring call triple, check the session's slot table for 452 * a match. If the slot is in use and the sequence numbers match, the 453 * client is still waiting for a response to the original request. 454 */ 455 static int referring_call_exists(struct nfs_client *clp, 456 uint32_t nrclists, 457 struct referring_call_list *rclists, 458 spinlock_t *lock) 459 __releases(lock) 460 __acquires(lock) 461 { 462 int status = 0; 463 int i, j; 464 struct nfs4_session *session; 465 struct nfs4_slot_table *tbl; 466 struct referring_call_list *rclist; 467 struct referring_call *ref; 468 469 /* 470 * XXX When client trunking is implemented, this becomes 471 * a session lookup from within the loop 472 */ 473 session = clp->cl_session; 474 tbl = &session->fc_slot_table; 475 476 for (i = 0; i < nrclists; i++) { 477 rclist = &rclists[i]; 478 if (memcmp(session->sess_id.data, 479 rclist->rcl_sessionid.data, 480 NFS4_MAX_SESSIONID_LEN) != 0) 481 continue; 482 483 for (j = 0; j < rclist->rcl_nrefcalls; j++) { 484 ref = &rclist->rcl_refcalls[j]; 485 spin_unlock(lock); 486 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, 487 ref->rc_sequenceid, HZ >> 1) < 0; 488 spin_lock(lock); 489 if (status) 490 goto out; 491 } 492 } 493 494 out: 495 return status; 496 } 497 498 __be32 nfs4_callback_sequence(void *argp, void *resp, 499 struct cb_process_state *cps) 500 { 501 struct cb_sequenceargs *args = argp; 502 struct cb_sequenceres *res = resp; 503 struct nfs4_slot_table *tbl; 504 struct nfs4_slot *slot; 505 struct nfs_client *clp; 506 int i; 507 __be32 status = htonl(NFS4ERR_BADSESSION); 508 509 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, 510 &args->csa_sessionid, cps->minorversion); 511 if (clp == NULL) 512 goto out; 513 514 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 515 goto out; 516 517 tbl = &clp->cl_session->bc_slot_table; 518 519 /* Set up res before grabbing the spinlock */ 520 memcpy(&res->csr_sessionid, &args->csa_sessionid, 521 sizeof(res->csr_sessionid)); 522 res->csr_sequenceid = args->csa_sequenceid; 523 res->csr_slotid = args->csa_slotid; 524 525 spin_lock(&tbl->slot_tbl_lock); 526 /* state manager is resetting the session */ 527 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { 528 status = htonl(NFS4ERR_DELAY); 529 /* Return NFS4ERR_BADSESSION if we're draining the session 530 * in order to reset it. 531 */ 532 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) 533 status = htonl(NFS4ERR_BADSESSION); 534 goto out_unlock; 535 } 536 537 status = htonl(NFS4ERR_BADSLOT); 538 slot = nfs4_lookup_slot(tbl, args->csa_slotid); 539 if (IS_ERR(slot)) 540 goto out_unlock; 541 542 res->csr_highestslotid = tbl->server_highest_slotid; 543 res->csr_target_highestslotid = tbl->target_highest_slotid; 544 545 status = validate_seqid(tbl, slot, args); 546 if (status) 547 goto out_unlock; 548 if (!nfs4_try_to_lock_slot(tbl, slot)) { 549 status = htonl(NFS4ERR_DELAY); 550 goto out_unlock; 551 } 552 cps->slot = slot; 553 554 /* The ca_maxresponsesize_cached is 0 with no DRC */ 555 if (args->csa_cachethis != 0) { 556 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); 557 goto out_unlock; 558 } 559 560 /* 561 * Check for pending referring calls. If a match is found, a 562 * related callback was received before the response to the original 563 * call. 564 */ 565 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists, 566 &tbl->slot_tbl_lock) < 0) { 567 status = htonl(NFS4ERR_DELAY); 568 goto out_unlock; 569 } 570 571 /* 572 * RFC5661 20.9.3 573 * If CB_SEQUENCE returns an error, then the state of the slot 574 * (sequence ID, cached reply) MUST NOT change. 575 */ 576 slot->seq_nr = args->csa_sequenceid; 577 out_unlock: 578 spin_unlock(&tbl->slot_tbl_lock); 579 580 out: 581 cps->clp = clp; /* put in nfs4_callback_compound */ 582 for (i = 0; i < args->csa_nrclists; i++) 583 kfree(args->csa_rclists[i].rcl_refcalls); 584 kfree(args->csa_rclists); 585 586 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 587 cps->drc_status = status; 588 status = 0; 589 } else 590 res->csr_status = status; 591 592 trace_nfs4_cb_sequence(args, res, status); 593 return status; 594 } 595 596 static bool 597 validate_bitmap_values(unsigned int mask) 598 { 599 return (mask & ~RCA4_TYPE_MASK_ALL) == 0; 600 } 601 602 __be32 nfs4_callback_recallany(void *argp, void *resp, 603 struct cb_process_state *cps) 604 { 605 struct cb_recallanyargs *args = argp; 606 __be32 status; 607 fmode_t flags = 0; 608 609 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 610 if (!cps->clp) /* set in cb_sequence */ 611 goto out; 612 613 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n", 614 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 615 616 status = cpu_to_be32(NFS4ERR_INVAL); 617 if (!validate_bitmap_values(args->craa_type_mask)) 618 goto out; 619 620 status = cpu_to_be32(NFS4_OK); 621 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG)) 622 flags = FMODE_READ; 623 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG)) 624 flags |= FMODE_WRITE; 625 if (flags) 626 nfs_expire_unused_delegation_types(cps->clp, flags); 627 628 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT)) 629 pnfs_recall_all_layouts(cps->clp); 630 out: 631 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 632 return status; 633 } 634 635 /* Reduce the fore channel's max_slots to the target value */ 636 __be32 nfs4_callback_recallslot(void *argp, void *resp, 637 struct cb_process_state *cps) 638 { 639 struct cb_recallslotargs *args = argp; 640 struct nfs4_slot_table *fc_tbl; 641 __be32 status; 642 643 status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 644 if (!cps->clp) /* set in cb_sequence */ 645 goto out; 646 647 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n", 648 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), 649 args->crsa_target_highest_slotid); 650 651 fc_tbl = &cps->clp->cl_session->fc_slot_table; 652 653 status = htonl(NFS4_OK); 654 655 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid); 656 nfs41_notify_server(cps->clp); 657 out: 658 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 659 return status; 660 } 661 662 __be32 nfs4_callback_notify_lock(void *argp, void *resp, 663 struct cb_process_state *cps) 664 { 665 struct cb_notify_lock_args *args = argp; 666 667 if (!cps->clp) /* set in cb_sequence */ 668 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 669 670 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", 671 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 672 673 /* Don't wake anybody if the string looked bogus */ 674 if (args->cbnl_valid) 675 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); 676 677 return htonl(NFS4_OK); 678 } 679 #endif /* CONFIG_NFS_V4_1 */ 680 #ifdef CONFIG_NFS_V4_2 681 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state, 682 struct cb_offloadargs *args) 683 { 684 cp_state->count = args->wr_count; 685 cp_state->error = args->error; 686 if (!args->error) { 687 cp_state->verf.committed = args->wr_writeverf.committed; 688 memcpy(&cp_state->verf.verifier.data[0], 689 &args->wr_writeverf.verifier.data[0], 690 NFS4_VERIFIER_SIZE); 691 } 692 } 693 694 __be32 nfs4_callback_offload(void *data, void *dummy, 695 struct cb_process_state *cps) 696 { 697 struct cb_offloadargs *args = data; 698 struct nfs_server *server; 699 struct nfs4_copy_state *copy, *tmp_copy; 700 bool found = false; 701 702 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS); 703 if (!copy) 704 return htonl(NFS4ERR_SERVERFAULT); 705 706 spin_lock(&cps->clp->cl_lock); 707 rcu_read_lock(); 708 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks, 709 client_link) { 710 list_for_each_entry(tmp_copy, &server->ss_copies, copies) { 711 if (memcmp(args->coa_stateid.other, 712 tmp_copy->stateid.other, 713 sizeof(args->coa_stateid.other))) 714 continue; 715 nfs4_copy_cb_args(tmp_copy, args); 716 complete(&tmp_copy->completion); 717 found = true; 718 goto out; 719 } 720 } 721 out: 722 rcu_read_unlock(); 723 if (!found) { 724 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE); 725 nfs4_copy_cb_args(copy, args); 726 list_add_tail(©->copies, &cps->clp->pending_cb_stateids); 727 } else 728 kfree(copy); 729 spin_unlock(&cps->clp->cl_lock); 730 731 return 0; 732 } 733 #endif /* CONFIG_NFS_V4_2 */ 734