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 nfs_inode *nfsi; 30 struct inode *inode; 31 32 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 33 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 34 goto out; 35 36 res->bitmap[0] = res->bitmap[1] = 0; 37 res->status = htonl(NFS4ERR_BADHANDLE); 38 39 dprintk_rcu("NFS: GETATTR callback request from %s\n", 40 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 41 42 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 43 if (IS_ERR(inode)) { 44 if (inode == ERR_PTR(-EAGAIN)) 45 res->status = htonl(NFS4ERR_DELAY); 46 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL, 47 -ntohl(res->status)); 48 goto out; 49 } 50 nfsi = NFS_I(inode); 51 rcu_read_lock(); 52 delegation = rcu_dereference(nfsi->delegation); 53 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0) 54 goto out_iput; 55 res->size = i_size_read(inode); 56 res->change_attr = delegation->change_attr; 57 if (nfs_have_writebacks(inode)) 58 res->change_attr++; 59 res->ctime = timespec64_to_timespec(inode->i_ctime); 60 res->mtime = timespec64_to_timespec(inode->i_mtime); 61 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) & 62 args->bitmap[0]; 63 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) & 64 args->bitmap[1]; 65 res->status = 0; 66 out_iput: 67 rcu_read_unlock(); 68 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status)); 69 nfs_iput_and_deactive(inode); 70 out: 71 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); 72 return res->status; 73 } 74 75 __be32 nfs4_callback_recall(void *argp, void *resp, 76 struct cb_process_state *cps) 77 { 78 struct cb_recallargs *args = argp; 79 struct inode *inode; 80 __be32 res; 81 82 res = htonl(NFS4ERR_OP_NOT_IN_SESSION); 83 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 84 goto out; 85 86 dprintk_rcu("NFS: RECALL callback request from %s\n", 87 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 88 89 res = htonl(NFS4ERR_BADHANDLE); 90 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 91 if (IS_ERR(inode)) { 92 if (inode == ERR_PTR(-EAGAIN)) 93 res = htonl(NFS4ERR_DELAY); 94 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL, 95 &args->stateid, -ntohl(res)); 96 goto out; 97 } 98 /* Set up a helper thread to actually return the delegation */ 99 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { 100 case 0: 101 res = 0; 102 break; 103 case -ENOENT: 104 res = htonl(NFS4ERR_BAD_STATEID); 105 break; 106 default: 107 res = htonl(NFS4ERR_RESOURCE); 108 } 109 trace_nfs4_cb_recall(cps->clp, &args->fh, inode, 110 &args->stateid, -ntohl(res)); 111 nfs_iput_and_deactive(inode); 112 out: 113 dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); 114 return res; 115 } 116 117 #if defined(CONFIG_NFS_V4_1) 118 119 /* 120 * Lookup a layout inode by stateid 121 * 122 * Note: returns a refcount on the inode and superblock 123 */ 124 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp, 125 const nfs4_stateid *stateid) 126 { 127 struct nfs_server *server; 128 struct inode *inode; 129 struct pnfs_layout_hdr *lo; 130 131 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 132 list_for_each_entry(lo, &server->layouts, plh_layouts) { 133 if (stateid != NULL && 134 !nfs4_stateid_match_other(stateid, &lo->plh_stateid)) 135 continue; 136 inode = igrab(lo->plh_inode); 137 if (!inode) 138 return ERR_PTR(-EAGAIN); 139 if (!nfs_sb_active(inode->i_sb)) { 140 rcu_read_unlock(); 141 spin_unlock(&clp->cl_lock); 142 iput(inode); 143 spin_lock(&clp->cl_lock); 144 rcu_read_lock(); 145 return ERR_PTR(-EAGAIN); 146 } 147 return inode; 148 } 149 } 150 151 return ERR_PTR(-ENOENT); 152 } 153 154 /* 155 * Lookup a layout inode by filehandle. 156 * 157 * Note: returns a refcount on the inode and superblock 158 * 159 */ 160 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp, 161 const struct nfs_fh *fh) 162 { 163 struct nfs_server *server; 164 struct nfs_inode *nfsi; 165 struct inode *inode; 166 struct pnfs_layout_hdr *lo; 167 168 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 169 list_for_each_entry(lo, &server->layouts, plh_layouts) { 170 nfsi = NFS_I(lo->plh_inode); 171 if (nfs_compare_fh(fh, &nfsi->fh)) 172 continue; 173 if (nfsi->layout != lo) 174 continue; 175 inode = igrab(lo->plh_inode); 176 if (!inode) 177 return ERR_PTR(-EAGAIN); 178 if (!nfs_sb_active(inode->i_sb)) { 179 rcu_read_unlock(); 180 spin_unlock(&clp->cl_lock); 181 iput(inode); 182 spin_lock(&clp->cl_lock); 183 rcu_read_lock(); 184 return ERR_PTR(-EAGAIN); 185 } 186 return inode; 187 } 188 } 189 190 return ERR_PTR(-ENOENT); 191 } 192 193 static struct inode *nfs_layout_find_inode(struct nfs_client *clp, 194 const struct nfs_fh *fh, 195 const nfs4_stateid *stateid) 196 { 197 struct inode *inode; 198 199 spin_lock(&clp->cl_lock); 200 rcu_read_lock(); 201 inode = nfs_layout_find_inode_by_stateid(clp, stateid); 202 if (inode == ERR_PTR(-ENOENT)) 203 inode = nfs_layout_find_inode_by_fh(clp, fh); 204 rcu_read_unlock(); 205 spin_unlock(&clp->cl_lock); 206 207 return inode; 208 } 209 210 /* 211 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing) 212 */ 213 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo, 214 const nfs4_stateid *new) 215 { 216 u32 oldseq, newseq; 217 218 /* Is the stateid not initialised? */ 219 if (!pnfs_layout_is_valid(lo)) 220 return NFS4ERR_NOMATCHING_LAYOUT; 221 222 /* Mismatched stateid? */ 223 if (!nfs4_stateid_match_other(&lo->plh_stateid, new)) 224 return NFS4ERR_BAD_STATEID; 225 226 newseq = be32_to_cpu(new->seqid); 227 /* Are we already in a layout recall situation? */ 228 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && 229 lo->plh_return_seq != 0) { 230 if (newseq < lo->plh_return_seq) 231 return NFS4ERR_OLD_STATEID; 232 if (newseq > lo->plh_return_seq) 233 return NFS4ERR_DELAY; 234 goto out; 235 } 236 237 /* Check that the stateid matches what we think it should be. */ 238 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 239 if (newseq > oldseq + 1) 240 return NFS4ERR_DELAY; 241 /* Crazy server! */ 242 if (newseq <= oldseq) 243 return NFS4ERR_OLD_STATEID; 244 out: 245 return NFS_OK; 246 } 247 248 static u32 initiate_file_draining(struct nfs_client *clp, 249 struct cb_layoutrecallargs *args) 250 { 251 struct inode *ino; 252 struct pnfs_layout_hdr *lo; 253 u32 rv = NFS4ERR_NOMATCHING_LAYOUT; 254 LIST_HEAD(free_me_list); 255 256 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid); 257 if (IS_ERR(ino)) { 258 if (ino == ERR_PTR(-EAGAIN)) 259 rv = NFS4ERR_DELAY; 260 goto out_noput; 261 } 262 263 pnfs_layoutcommit_inode(ino, false); 264 265 266 spin_lock(&ino->i_lock); 267 lo = NFS_I(ino)->layout; 268 if (!lo) { 269 spin_unlock(&ino->i_lock); 270 goto out; 271 } 272 pnfs_get_layout_hdr(lo); 273 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid); 274 if (rv != NFS_OK) 275 goto unlock; 276 277 /* 278 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return) 279 */ 280 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 281 rv = NFS4ERR_DELAY; 282 goto unlock; 283 } 284 285 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true); 286 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list, 287 &args->cbl_range, 288 be32_to_cpu(args->cbl_stateid.seqid))) { 289 case 0: 290 case -EBUSY: 291 /* There are layout segments that need to be returned */ 292 rv = NFS4_OK; 293 break; 294 case -ENOENT: 295 /* Embrace your forgetfulness! */ 296 rv = NFS4ERR_NOMATCHING_LAYOUT; 297 298 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 299 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, 300 &args->cbl_range); 301 } 302 } 303 unlock: 304 spin_unlock(&ino->i_lock); 305 pnfs_free_lseg_list(&free_me_list); 306 /* Free all lsegs that are attached to commit buckets */ 307 nfs_commit_inode(ino, 0); 308 pnfs_put_layout_hdr(lo); 309 out: 310 nfs_iput_and_deactive(ino); 311 out_noput: 312 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino, 313 &args->cbl_stateid, -rv); 314 return rv; 315 } 316 317 static u32 initiate_bulk_draining(struct nfs_client *clp, 318 struct cb_layoutrecallargs *args) 319 { 320 int stat; 321 322 if (args->cbl_recall_type == RETURN_FSID) 323 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true); 324 else 325 stat = pnfs_destroy_layouts_byclid(clp, true); 326 if (stat != 0) 327 return NFS4ERR_DELAY; 328 return NFS4ERR_NOMATCHING_LAYOUT; 329 } 330 331 static u32 do_callback_layoutrecall(struct nfs_client *clp, 332 struct cb_layoutrecallargs *args) 333 { 334 if (args->cbl_recall_type == RETURN_FILE) 335 return initiate_file_draining(clp, args); 336 return initiate_bulk_draining(clp, args); 337 } 338 339 __be32 nfs4_callback_layoutrecall(void *argp, void *resp, 340 struct cb_process_state *cps) 341 { 342 struct cb_layoutrecallargs *args = argp; 343 u32 res = NFS4ERR_OP_NOT_IN_SESSION; 344 345 if (cps->clp) 346 res = do_callback_layoutrecall(cps->clp, args); 347 return cpu_to_be32(res); 348 } 349 350 static void pnfs_recall_all_layouts(struct nfs_client *clp) 351 { 352 struct cb_layoutrecallargs args; 353 354 /* Pretend we got a CB_LAYOUTRECALL(ALL) */ 355 memset(&args, 0, sizeof(args)); 356 args.cbl_recall_type = RETURN_ALL; 357 /* FIXME we ignore errors, what should we do? */ 358 do_callback_layoutrecall(clp, &args); 359 } 360 361 __be32 nfs4_callback_devicenotify(void *argp, void *resp, 362 struct cb_process_state *cps) 363 { 364 struct cb_devicenotifyargs *args = argp; 365 int i; 366 __be32 res = 0; 367 struct nfs_client *clp = cps->clp; 368 struct nfs_server *server = NULL; 369 370 if (!clp) { 371 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 372 goto out; 373 } 374 375 for (i = 0; i < args->ndevs; i++) { 376 struct cb_devicenotifyitem *dev = &args->devs[i]; 377 378 if (!server || 379 server->pnfs_curr_ld->id != dev->cbd_layout_type) { 380 rcu_read_lock(); 381 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) 382 if (server->pnfs_curr_ld && 383 server->pnfs_curr_ld->id == dev->cbd_layout_type) { 384 rcu_read_unlock(); 385 goto found; 386 } 387 rcu_read_unlock(); 388 continue; 389 } 390 391 found: 392 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id); 393 } 394 395 out: 396 kfree(args->devs); 397 return res; 398 } 399 400 /* 401 * Validate the sequenceID sent by the server. 402 * Return success if the sequenceID is one more than what we last saw on 403 * this slot, accounting for wraparound. Increments the slot's sequence. 404 * 405 * We don't yet implement a duplicate request cache, instead we set the 406 * back channel ca_maxresponsesize_cached to zero. This is OK for now 407 * since we only currently implement idempotent callbacks anyway. 408 * 409 * We have a single slot backchannel at this time, so we don't bother 410 * checking the used_slots bit array on the table. The lower layer guarantees 411 * a single outstanding callback request at a time. 412 */ 413 static __be32 414 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, 415 const struct cb_sequenceargs * args) 416 { 417 __be32 ret; 418 419 ret = cpu_to_be32(NFS4ERR_BADSLOT); 420 if (args->csa_slotid > tbl->server_highest_slotid) 421 goto out_err; 422 423 /* Replay */ 424 if (args->csa_sequenceid == slot->seq_nr) { 425 ret = cpu_to_be32(NFS4ERR_DELAY); 426 if (nfs4_test_locked_slot(tbl, slot->slot_nr)) 427 goto out_err; 428 429 /* Signal process_op to set this error on next op */ 430 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP); 431 if (args->csa_cachethis == 0) 432 goto out_err; 433 434 /* Liar! We never allowed you to set csa_cachethis != 0 */ 435 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY); 436 goto out_err; 437 } 438 439 /* Note: wraparound relies on seq_nr being of type u32 */ 440 /* Misordered request */ 441 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED); 442 if (args->csa_sequenceid != slot->seq_nr + 1) 443 goto out_err; 444 445 return cpu_to_be32(NFS4_OK); 446 447 out_err: 448 trace_nfs4_cb_seqid_err(args, ret); 449 return ret; 450 } 451 452 /* 453 * For each referring call triple, check the session's slot table for 454 * a match. If the slot is in use and the sequence numbers match, the 455 * client is still waiting for a response to the original request. 456 */ 457 static int referring_call_exists(struct nfs_client *clp, 458 uint32_t nrclists, 459 struct referring_call_list *rclists, 460 spinlock_t *lock) 461 __releases(lock) 462 __acquires(lock) 463 { 464 int status = 0; 465 int i, j; 466 struct nfs4_session *session; 467 struct nfs4_slot_table *tbl; 468 struct referring_call_list *rclist; 469 struct referring_call *ref; 470 471 /* 472 * XXX When client trunking is implemented, this becomes 473 * a session lookup from within the loop 474 */ 475 session = clp->cl_session; 476 tbl = &session->fc_slot_table; 477 478 for (i = 0; i < nrclists; i++) { 479 rclist = &rclists[i]; 480 if (memcmp(session->sess_id.data, 481 rclist->rcl_sessionid.data, 482 NFS4_MAX_SESSIONID_LEN) != 0) 483 continue; 484 485 for (j = 0; j < rclist->rcl_nrefcalls; j++) { 486 ref = &rclist->rcl_refcalls[j]; 487 spin_unlock(lock); 488 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, 489 ref->rc_sequenceid, HZ >> 1) < 0; 490 spin_lock(lock); 491 if (status) 492 goto out; 493 } 494 } 495 496 out: 497 return status; 498 } 499 500 __be32 nfs4_callback_sequence(void *argp, void *resp, 501 struct cb_process_state *cps) 502 { 503 struct cb_sequenceargs *args = argp; 504 struct cb_sequenceres *res = resp; 505 struct nfs4_slot_table *tbl; 506 struct nfs4_slot *slot; 507 struct nfs_client *clp; 508 int i; 509 __be32 status = htonl(NFS4ERR_BADSESSION); 510 511 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, 512 &args->csa_sessionid, cps->minorversion); 513 if (clp == NULL) 514 goto out; 515 516 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 517 goto out; 518 519 tbl = &clp->cl_session->bc_slot_table; 520 521 /* Set up res before grabbing the spinlock */ 522 memcpy(&res->csr_sessionid, &args->csa_sessionid, 523 sizeof(res->csr_sessionid)); 524 res->csr_sequenceid = args->csa_sequenceid; 525 res->csr_slotid = args->csa_slotid; 526 527 spin_lock(&tbl->slot_tbl_lock); 528 /* state manager is resetting the session */ 529 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { 530 status = htonl(NFS4ERR_DELAY); 531 /* Return NFS4ERR_BADSESSION if we're draining the session 532 * in order to reset it. 533 */ 534 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) 535 status = htonl(NFS4ERR_BADSESSION); 536 goto out_unlock; 537 } 538 539 status = htonl(NFS4ERR_BADSLOT); 540 slot = nfs4_lookup_slot(tbl, args->csa_slotid); 541 if (IS_ERR(slot)) 542 goto out_unlock; 543 544 res->csr_highestslotid = tbl->server_highest_slotid; 545 res->csr_target_highestslotid = tbl->target_highest_slotid; 546 547 status = validate_seqid(tbl, slot, args); 548 if (status) 549 goto out_unlock; 550 if (!nfs4_try_to_lock_slot(tbl, slot)) { 551 status = htonl(NFS4ERR_DELAY); 552 goto out_unlock; 553 } 554 cps->slot = slot; 555 556 /* The ca_maxresponsesize_cached is 0 with no DRC */ 557 if (args->csa_cachethis != 0) { 558 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); 559 goto out_unlock; 560 } 561 562 /* 563 * Check for pending referring calls. If a match is found, a 564 * related callback was received before the response to the original 565 * call. 566 */ 567 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists, 568 &tbl->slot_tbl_lock) < 0) { 569 status = htonl(NFS4ERR_DELAY); 570 goto out_unlock; 571 } 572 573 /* 574 * RFC5661 20.9.3 575 * If CB_SEQUENCE returns an error, then the state of the slot 576 * (sequence ID, cached reply) MUST NOT change. 577 */ 578 slot->seq_nr = args->csa_sequenceid; 579 out_unlock: 580 spin_unlock(&tbl->slot_tbl_lock); 581 582 out: 583 cps->clp = clp; /* put in nfs4_callback_compound */ 584 for (i = 0; i < args->csa_nrclists; i++) 585 kfree(args->csa_rclists[i].rcl_refcalls); 586 kfree(args->csa_rclists); 587 588 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 589 cps->drc_status = status; 590 status = 0; 591 } else 592 res->csr_status = status; 593 594 trace_nfs4_cb_sequence(args, res, status); 595 return status; 596 } 597 598 static bool 599 validate_bitmap_values(unsigned int mask) 600 { 601 return (mask & ~RCA4_TYPE_MASK_ALL) == 0; 602 } 603 604 __be32 nfs4_callback_recallany(void *argp, void *resp, 605 struct cb_process_state *cps) 606 { 607 struct cb_recallanyargs *args = argp; 608 __be32 status; 609 fmode_t flags = 0; 610 611 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 612 if (!cps->clp) /* set in cb_sequence */ 613 goto out; 614 615 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n", 616 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 617 618 status = cpu_to_be32(NFS4ERR_INVAL); 619 if (!validate_bitmap_values(args->craa_type_mask)) 620 goto out; 621 622 status = cpu_to_be32(NFS4_OK); 623 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG)) 624 flags = FMODE_READ; 625 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG)) 626 flags |= FMODE_WRITE; 627 if (flags) 628 nfs_expire_unused_delegation_types(cps->clp, flags); 629 630 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT)) 631 pnfs_recall_all_layouts(cps->clp); 632 out: 633 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 634 return status; 635 } 636 637 /* Reduce the fore channel's max_slots to the target value */ 638 __be32 nfs4_callback_recallslot(void *argp, void *resp, 639 struct cb_process_state *cps) 640 { 641 struct cb_recallslotargs *args = argp; 642 struct nfs4_slot_table *fc_tbl; 643 __be32 status; 644 645 status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 646 if (!cps->clp) /* set in cb_sequence */ 647 goto out; 648 649 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n", 650 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), 651 args->crsa_target_highest_slotid); 652 653 fc_tbl = &cps->clp->cl_session->fc_slot_table; 654 655 status = htonl(NFS4_OK); 656 657 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid); 658 nfs41_notify_server(cps->clp); 659 out: 660 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 661 return status; 662 } 663 664 __be32 nfs4_callback_notify_lock(void *argp, void *resp, 665 struct cb_process_state *cps) 666 { 667 struct cb_notify_lock_args *args = argp; 668 669 if (!cps->clp) /* set in cb_sequence */ 670 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 671 672 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", 673 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 674 675 /* Don't wake anybody if the string looked bogus */ 676 if (args->cbnl_valid) 677 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); 678 679 return htonl(NFS4_OK); 680 } 681 #endif /* CONFIG_NFS_V4_1 */ 682 #ifdef CONFIG_NFS_V4_2 683 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state, 684 struct cb_offloadargs *args) 685 { 686 cp_state->count = args->wr_count; 687 cp_state->error = args->error; 688 if (!args->error) { 689 cp_state->verf.committed = args->wr_writeverf.committed; 690 memcpy(&cp_state->verf.verifier.data[0], 691 &args->wr_writeverf.verifier.data[0], 692 NFS4_VERIFIER_SIZE); 693 } 694 } 695 696 __be32 nfs4_callback_offload(void *data, void *dummy, 697 struct cb_process_state *cps) 698 { 699 struct cb_offloadargs *args = data; 700 struct nfs_server *server; 701 struct nfs4_copy_state *copy, *tmp_copy; 702 bool found = false; 703 704 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS); 705 if (!copy) 706 return htonl(NFS4ERR_SERVERFAULT); 707 708 spin_lock(&cps->clp->cl_lock); 709 rcu_read_lock(); 710 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks, 711 client_link) { 712 list_for_each_entry(tmp_copy, &server->ss_copies, copies) { 713 if (memcmp(args->coa_stateid.other, 714 tmp_copy->stateid.other, 715 sizeof(args->coa_stateid.other))) 716 continue; 717 nfs4_copy_cb_args(tmp_copy, args); 718 complete(&tmp_copy->completion); 719 found = true; 720 goto out; 721 } 722 } 723 out: 724 rcu_read_unlock(); 725 if (!found) { 726 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE); 727 nfs4_copy_cb_args(copy, args); 728 list_add_tail(©->copies, &cps->clp->pending_cb_stateids); 729 } else 730 kfree(copy); 731 spin_unlock(&cps->clp->cl_lock); 732 733 return 0; 734 } 735 #endif /* CONFIG_NFS_V4_2 */ 736