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 iput(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 iput(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 if (args->csa_slotid > tbl->server_highest_slotid) 418 return htonl(NFS4ERR_BADSLOT); 419 420 /* Replay */ 421 if (args->csa_sequenceid == slot->seq_nr) { 422 if (nfs4_test_locked_slot(tbl, slot->slot_nr)) 423 return htonl(NFS4ERR_DELAY); 424 /* Signal process_op to set this error on next op */ 425 if (args->csa_cachethis == 0) 426 return htonl(NFS4ERR_RETRY_UNCACHED_REP); 427 428 /* Liar! We never allowed you to set csa_cachethis != 0 */ 429 return htonl(NFS4ERR_SEQ_FALSE_RETRY); 430 } 431 432 /* Note: wraparound relies on seq_nr being of type u32 */ 433 if (likely(args->csa_sequenceid == slot->seq_nr + 1)) 434 return htonl(NFS4_OK); 435 436 /* Misordered request */ 437 return htonl(NFS4ERR_SEQ_MISORDERED); 438 } 439 440 /* 441 * For each referring call triple, check the session's slot table for 442 * a match. If the slot is in use and the sequence numbers match, the 443 * client is still waiting for a response to the original request. 444 */ 445 static int referring_call_exists(struct nfs_client *clp, 446 uint32_t nrclists, 447 struct referring_call_list *rclists, 448 spinlock_t *lock) 449 __releases(lock) 450 __acquires(lock) 451 { 452 int status = 0; 453 int i, j; 454 struct nfs4_session *session; 455 struct nfs4_slot_table *tbl; 456 struct referring_call_list *rclist; 457 struct referring_call *ref; 458 459 /* 460 * XXX When client trunking is implemented, this becomes 461 * a session lookup from within the loop 462 */ 463 session = clp->cl_session; 464 tbl = &session->fc_slot_table; 465 466 for (i = 0; i < nrclists; i++) { 467 rclist = &rclists[i]; 468 if (memcmp(session->sess_id.data, 469 rclist->rcl_sessionid.data, 470 NFS4_MAX_SESSIONID_LEN) != 0) 471 continue; 472 473 for (j = 0; j < rclist->rcl_nrefcalls; j++) { 474 ref = &rclist->rcl_refcalls[j]; 475 spin_unlock(lock); 476 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, 477 ref->rc_sequenceid, HZ >> 1) < 0; 478 spin_lock(lock); 479 if (status) 480 goto out; 481 } 482 } 483 484 out: 485 return status; 486 } 487 488 __be32 nfs4_callback_sequence(void *argp, void *resp, 489 struct cb_process_state *cps) 490 { 491 struct cb_sequenceargs *args = argp; 492 struct cb_sequenceres *res = resp; 493 struct nfs4_slot_table *tbl; 494 struct nfs4_slot *slot; 495 struct nfs_client *clp; 496 int i; 497 __be32 status = htonl(NFS4ERR_BADSESSION); 498 499 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, 500 &args->csa_sessionid, cps->minorversion); 501 if (clp == NULL) 502 goto out; 503 504 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 505 goto out; 506 507 tbl = &clp->cl_session->bc_slot_table; 508 509 /* Set up res before grabbing the spinlock */ 510 memcpy(&res->csr_sessionid, &args->csa_sessionid, 511 sizeof(res->csr_sessionid)); 512 res->csr_sequenceid = args->csa_sequenceid; 513 res->csr_slotid = args->csa_slotid; 514 515 spin_lock(&tbl->slot_tbl_lock); 516 /* state manager is resetting the session */ 517 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { 518 status = htonl(NFS4ERR_DELAY); 519 /* Return NFS4ERR_BADSESSION if we're draining the session 520 * in order to reset it. 521 */ 522 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) 523 status = htonl(NFS4ERR_BADSESSION); 524 goto out_unlock; 525 } 526 527 status = htonl(NFS4ERR_BADSLOT); 528 slot = nfs4_lookup_slot(tbl, args->csa_slotid); 529 if (IS_ERR(slot)) 530 goto out_unlock; 531 532 res->csr_highestslotid = tbl->server_highest_slotid; 533 res->csr_target_highestslotid = tbl->target_highest_slotid; 534 535 status = validate_seqid(tbl, slot, args); 536 if (status) 537 goto out_unlock; 538 if (!nfs4_try_to_lock_slot(tbl, slot)) { 539 status = htonl(NFS4ERR_DELAY); 540 goto out_unlock; 541 } 542 cps->slot = slot; 543 544 /* The ca_maxresponsesize_cached is 0 with no DRC */ 545 if (args->csa_cachethis != 0) { 546 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); 547 goto out_unlock; 548 } 549 550 /* 551 * Check for pending referring calls. If a match is found, a 552 * related callback was received before the response to the original 553 * call. 554 */ 555 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists, 556 &tbl->slot_tbl_lock) < 0) { 557 status = htonl(NFS4ERR_DELAY); 558 goto out_unlock; 559 } 560 561 /* 562 * RFC5661 20.9.3 563 * If CB_SEQUENCE returns an error, then the state of the slot 564 * (sequence ID, cached reply) MUST NOT change. 565 */ 566 slot->seq_nr = args->csa_sequenceid; 567 out_unlock: 568 spin_unlock(&tbl->slot_tbl_lock); 569 570 out: 571 cps->clp = clp; /* put in nfs4_callback_compound */ 572 for (i = 0; i < args->csa_nrclists; i++) 573 kfree(args->csa_rclists[i].rcl_refcalls); 574 kfree(args->csa_rclists); 575 576 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 577 cps->drc_status = status; 578 status = 0; 579 } else 580 res->csr_status = status; 581 582 trace_nfs4_cb_sequence(args, res, status); 583 return status; 584 } 585 586 static bool 587 validate_bitmap_values(unsigned int mask) 588 { 589 return (mask & ~RCA4_TYPE_MASK_ALL) == 0; 590 } 591 592 __be32 nfs4_callback_recallany(void *argp, void *resp, 593 struct cb_process_state *cps) 594 { 595 struct cb_recallanyargs *args = argp; 596 __be32 status; 597 fmode_t flags = 0; 598 599 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 600 if (!cps->clp) /* set in cb_sequence */ 601 goto out; 602 603 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n", 604 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 605 606 status = cpu_to_be32(NFS4ERR_INVAL); 607 if (!validate_bitmap_values(args->craa_type_mask)) 608 goto out; 609 610 status = cpu_to_be32(NFS4_OK); 611 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG)) 612 flags = FMODE_READ; 613 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG)) 614 flags |= FMODE_WRITE; 615 if (flags) 616 nfs_expire_unused_delegation_types(cps->clp, flags); 617 618 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT)) 619 pnfs_recall_all_layouts(cps->clp); 620 out: 621 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 622 return status; 623 } 624 625 /* Reduce the fore channel's max_slots to the target value */ 626 __be32 nfs4_callback_recallslot(void *argp, void *resp, 627 struct cb_process_state *cps) 628 { 629 struct cb_recallslotargs *args = argp; 630 struct nfs4_slot_table *fc_tbl; 631 __be32 status; 632 633 status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 634 if (!cps->clp) /* set in cb_sequence */ 635 goto out; 636 637 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n", 638 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), 639 args->crsa_target_highest_slotid); 640 641 fc_tbl = &cps->clp->cl_session->fc_slot_table; 642 643 status = htonl(NFS4_OK); 644 645 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid); 646 nfs41_notify_server(cps->clp); 647 out: 648 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 649 return status; 650 } 651 652 __be32 nfs4_callback_notify_lock(void *argp, void *resp, 653 struct cb_process_state *cps) 654 { 655 struct cb_notify_lock_args *args = argp; 656 657 if (!cps->clp) /* set in cb_sequence */ 658 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 659 660 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", 661 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 662 663 /* Don't wake anybody if the string looked bogus */ 664 if (args->cbnl_valid) 665 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); 666 667 return htonl(NFS4_OK); 668 } 669 #endif /* CONFIG_NFS_V4_1 */ 670 #ifdef CONFIG_NFS_V4_2 671 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state, 672 struct cb_offloadargs *args) 673 { 674 cp_state->count = args->wr_count; 675 cp_state->error = args->error; 676 if (!args->error) { 677 cp_state->verf.committed = args->wr_writeverf.committed; 678 memcpy(&cp_state->verf.verifier.data[0], 679 &args->wr_writeverf.verifier.data[0], 680 NFS4_VERIFIER_SIZE); 681 } 682 } 683 684 __be32 nfs4_callback_offload(void *data, void *dummy, 685 struct cb_process_state *cps) 686 { 687 struct cb_offloadargs *args = data; 688 struct nfs_server *server; 689 struct nfs4_copy_state *copy; 690 bool found = false; 691 692 spin_lock(&cps->clp->cl_lock); 693 rcu_read_lock(); 694 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks, 695 client_link) { 696 list_for_each_entry(copy, &server->ss_copies, copies) { 697 if (memcmp(args->coa_stateid.other, 698 copy->stateid.other, 699 sizeof(args->coa_stateid.other))) 700 continue; 701 nfs4_copy_cb_args(copy, args); 702 complete(©->completion); 703 found = true; 704 goto out; 705 } 706 } 707 out: 708 rcu_read_unlock(); 709 if (!found) { 710 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS); 711 if (!copy) { 712 spin_unlock(&cps->clp->cl_lock); 713 return htonl(NFS4ERR_SERVERFAULT); 714 } 715 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE); 716 nfs4_copy_cb_args(copy, args); 717 list_add_tail(©->copies, &cps->clp->pending_cb_stateids); 718 } 719 spin_unlock(&cps->clp->cl_lock); 720 721 return 0; 722 } 723 #endif /* CONFIG_NFS_V4_2 */ 724