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 10 #include <linux/errno.h> 11 #include <linux/math.h> 12 #include <linux/nfs4.h> 13 #include <linux/nfs_fs.h> 14 #include <linux/slab.h> 15 #include <linux/rcupdate.h> 16 #include <linux/types.h> 17 18 #include "nfs4_fs.h" 19 #include "callback.h" 20 #include "delegation.h" 21 #include "internal.h" 22 #include "pnfs.h" 23 #include "nfs4session.h" 24 #include "nfs4trace.h" 25 26 #define NFSDBG_FACILITY NFSDBG_CALLBACK 27 28 __be32 nfs4_callback_getattr(void *argp, void *resp, 29 struct cb_process_state *cps) 30 { 31 struct cb_getattrargs *args = argp; 32 struct cb_getattrres *res = resp; 33 struct nfs_delegation *delegation; 34 struct inode *inode; 35 36 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 37 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 38 goto out; 39 40 res->bitmap[0] = res->bitmap[1] = 0; 41 res->status = htonl(NFS4ERR_BADHANDLE); 42 43 dprintk_rcu("NFS: GETATTR callback request from %s\n", 44 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 45 46 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 47 if (IS_ERR(inode)) { 48 if (inode == ERR_PTR(-EAGAIN)) 49 res->status = htonl(NFS4ERR_DELAY); 50 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL, 51 -ntohl(res->status)); 52 goto out; 53 } 54 rcu_read_lock(); 55 delegation = nfs4_get_valid_delegation(inode); 56 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0) 57 goto out_iput; 58 res->size = i_size_read(inode); 59 res->change_attr = delegation->change_attr; 60 if (nfs_have_writebacks(inode)) 61 res->change_attr++; 62 res->ctime = inode->i_ctime; 63 res->mtime = inode->i_mtime; 64 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) & 65 args->bitmap[0]; 66 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) & 67 args->bitmap[1]; 68 res->status = 0; 69 out_iput: 70 rcu_read_unlock(); 71 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status)); 72 nfs_iput_and_deactive(inode); 73 out: 74 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); 75 return res->status; 76 } 77 78 __be32 nfs4_callback_recall(void *argp, void *resp, 79 struct cb_process_state *cps) 80 { 81 struct cb_recallargs *args = argp; 82 struct inode *inode; 83 __be32 res; 84 85 res = htonl(NFS4ERR_OP_NOT_IN_SESSION); 86 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 87 goto out; 88 89 dprintk_rcu("NFS: RECALL callback request from %s\n", 90 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 91 92 res = htonl(NFS4ERR_BADHANDLE); 93 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 94 if (IS_ERR(inode)) { 95 if (inode == ERR_PTR(-EAGAIN)) 96 res = htonl(NFS4ERR_DELAY); 97 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL, 98 &args->stateid, -ntohl(res)); 99 goto out; 100 } 101 /* Set up a helper thread to actually return the delegation */ 102 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { 103 case 0: 104 res = 0; 105 break; 106 case -ENOENT: 107 res = htonl(NFS4ERR_BAD_STATEID); 108 break; 109 default: 110 res = htonl(NFS4ERR_RESOURCE); 111 } 112 trace_nfs4_cb_recall(cps->clp, &args->fh, inode, 113 &args->stateid, -ntohl(res)); 114 nfs_iput_and_deactive(inode); 115 out: 116 dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); 117 return res; 118 } 119 120 #if defined(CONFIG_NFS_V4_1) 121 122 /* 123 * Lookup a layout inode by stateid 124 * 125 * Note: returns a refcount on the inode and superblock 126 */ 127 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp, 128 const nfs4_stateid *stateid) 129 __must_hold(RCU) 130 { 131 struct nfs_server *server; 132 struct inode *inode; 133 struct pnfs_layout_hdr *lo; 134 135 rcu_read_lock(); 136 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 137 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 138 if (!pnfs_layout_is_valid(lo)) 139 continue; 140 if (stateid != NULL && 141 !nfs4_stateid_match_other(stateid, &lo->plh_stateid)) 142 continue; 143 if (!nfs_sb_active(server->super)) 144 continue; 145 inode = igrab(lo->plh_inode); 146 rcu_read_unlock(); 147 if (inode) 148 return inode; 149 nfs_sb_deactive(server->super); 150 return ERR_PTR(-EAGAIN); 151 } 152 } 153 rcu_read_unlock(); 154 return ERR_PTR(-ENOENT); 155 } 156 157 /* 158 * Lookup a layout inode by filehandle. 159 * 160 * Note: returns a refcount on the inode and superblock 161 * 162 */ 163 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp, 164 const struct nfs_fh *fh) 165 { 166 struct nfs_server *server; 167 struct nfs_inode *nfsi; 168 struct inode *inode; 169 struct pnfs_layout_hdr *lo; 170 171 rcu_read_lock(); 172 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 173 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 174 nfsi = NFS_I(lo->plh_inode); 175 if (nfs_compare_fh(fh, &nfsi->fh)) 176 continue; 177 if (nfsi->layout != lo) 178 continue; 179 if (!nfs_sb_active(server->super)) 180 continue; 181 inode = igrab(lo->plh_inode); 182 rcu_read_unlock(); 183 if (inode) 184 return inode; 185 nfs_sb_deactive(server->super); 186 return ERR_PTR(-EAGAIN); 187 } 188 } 189 rcu_read_unlock(); 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 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 return inode; 203 } 204 205 /* 206 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing) 207 */ 208 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo, 209 const nfs4_stateid *new) 210 { 211 u32 oldseq, newseq; 212 213 /* Is the stateid not initialised? */ 214 if (!pnfs_layout_is_valid(lo)) 215 return NFS4ERR_NOMATCHING_LAYOUT; 216 217 /* Mismatched stateid? */ 218 if (!nfs4_stateid_match_other(&lo->plh_stateid, new)) 219 return NFS4ERR_BAD_STATEID; 220 221 newseq = be32_to_cpu(new->seqid); 222 /* Are we already in a layout recall situation? */ 223 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && 224 lo->plh_return_seq != 0) { 225 if (newseq < lo->plh_return_seq) 226 return NFS4ERR_OLD_STATEID; 227 if (newseq > lo->plh_return_seq) 228 return NFS4ERR_DELAY; 229 goto out; 230 } 231 232 /* Check that the stateid matches what we think it should be. */ 233 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 234 if (newseq > oldseq + 1) 235 return NFS4ERR_DELAY; 236 /* Crazy server! */ 237 if (newseq <= oldseq) 238 return NFS4ERR_OLD_STATEID; 239 out: 240 return NFS_OK; 241 } 242 243 static u32 initiate_file_draining(struct nfs_client *clp, 244 struct cb_layoutrecallargs *args) 245 { 246 struct inode *ino; 247 struct pnfs_layout_hdr *lo; 248 u32 rv = NFS4ERR_NOMATCHING_LAYOUT; 249 LIST_HEAD(free_me_list); 250 251 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid); 252 if (IS_ERR(ino)) { 253 if (ino == ERR_PTR(-EAGAIN)) 254 rv = NFS4ERR_DELAY; 255 goto out_noput; 256 } 257 258 pnfs_layoutcommit_inode(ino, false); 259 260 261 spin_lock(&ino->i_lock); 262 lo = NFS_I(ino)->layout; 263 if (!lo) { 264 spin_unlock(&ino->i_lock); 265 goto out; 266 } 267 pnfs_get_layout_hdr(lo); 268 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid); 269 if (rv != NFS_OK) 270 goto unlock; 271 272 /* 273 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return) 274 */ 275 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 276 rv = NFS4ERR_DELAY; 277 goto unlock; 278 } 279 280 pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true); 281 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list, 282 &args->cbl_range, 283 be32_to_cpu(args->cbl_stateid.seqid))) { 284 case 0: 285 case -EBUSY: 286 /* There are layout segments that need to be returned */ 287 rv = NFS4_OK; 288 break; 289 case -ENOENT: 290 /* Embrace your forgetfulness! */ 291 rv = NFS4ERR_NOMATCHING_LAYOUT; 292 293 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 294 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, 295 &args->cbl_range); 296 } 297 } 298 unlock: 299 spin_unlock(&ino->i_lock); 300 pnfs_free_lseg_list(&free_me_list); 301 /* Free all lsegs that are attached to commit buckets */ 302 nfs_commit_inode(ino, 0); 303 pnfs_put_layout_hdr(lo); 304 out: 305 nfs_iput_and_deactive(ino); 306 out_noput: 307 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino, 308 &args->cbl_stateid, -rv); 309 return rv; 310 } 311 312 static u32 initiate_bulk_draining(struct nfs_client *clp, 313 struct cb_layoutrecallargs *args) 314 { 315 int stat; 316 317 if (args->cbl_recall_type == RETURN_FSID) 318 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true); 319 else 320 stat = pnfs_destroy_layouts_byclid(clp, true); 321 if (stat != 0) 322 return NFS4ERR_DELAY; 323 return NFS4ERR_NOMATCHING_LAYOUT; 324 } 325 326 static u32 do_callback_layoutrecall(struct nfs_client *clp, 327 struct cb_layoutrecallargs *args) 328 { 329 if (args->cbl_recall_type == RETURN_FILE) 330 return initiate_file_draining(clp, args); 331 return initiate_bulk_draining(clp, args); 332 } 333 334 __be32 nfs4_callback_layoutrecall(void *argp, void *resp, 335 struct cb_process_state *cps) 336 { 337 struct cb_layoutrecallargs *args = argp; 338 u32 res = NFS4ERR_OP_NOT_IN_SESSION; 339 340 if (cps->clp) 341 res = do_callback_layoutrecall(cps->clp, args); 342 return cpu_to_be32(res); 343 } 344 345 static void pnfs_recall_all_layouts(struct nfs_client *clp) 346 { 347 struct cb_layoutrecallargs args; 348 349 /* Pretend we got a CB_LAYOUTRECALL(ALL) */ 350 memset(&args, 0, sizeof(args)); 351 args.cbl_recall_type = RETURN_ALL; 352 /* FIXME we ignore errors, what should we do? */ 353 do_callback_layoutrecall(clp, &args); 354 } 355 356 __be32 nfs4_callback_devicenotify(void *argp, void *resp, 357 struct cb_process_state *cps) 358 { 359 struct cb_devicenotifyargs *args = argp; 360 int i; 361 __be32 res = 0; 362 struct nfs_client *clp = cps->clp; 363 struct nfs_server *server = NULL; 364 365 if (!clp) { 366 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 367 goto out; 368 } 369 370 for (i = 0; i < args->ndevs; i++) { 371 struct cb_devicenotifyitem *dev = &args->devs[i]; 372 373 if (!server || 374 server->pnfs_curr_ld->id != dev->cbd_layout_type) { 375 rcu_read_lock(); 376 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) 377 if (server->pnfs_curr_ld && 378 server->pnfs_curr_ld->id == dev->cbd_layout_type) { 379 rcu_read_unlock(); 380 goto found; 381 } 382 rcu_read_unlock(); 383 continue; 384 } 385 386 found: 387 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id); 388 } 389 390 out: 391 kfree(args->devs); 392 return res; 393 } 394 395 /* 396 * Validate the sequenceID sent by the server. 397 * Return success if the sequenceID is one more than what we last saw on 398 * this slot, accounting for wraparound. Increments the slot's sequence. 399 * 400 * We don't yet implement a duplicate request cache, instead we set the 401 * back channel ca_maxresponsesize_cached to zero. This is OK for now 402 * since we only currently implement idempotent callbacks anyway. 403 * 404 * We have a single slot backchannel at this time, so we don't bother 405 * checking the used_slots bit array on the table. The lower layer guarantees 406 * a single outstanding callback request at a time. 407 */ 408 static __be32 409 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, 410 const struct cb_sequenceargs * args) 411 { 412 __be32 ret; 413 414 ret = cpu_to_be32(NFS4ERR_BADSLOT); 415 if (args->csa_slotid > tbl->server_highest_slotid) 416 goto out_err; 417 418 /* Replay */ 419 if (args->csa_sequenceid == slot->seq_nr) { 420 ret = cpu_to_be32(NFS4ERR_DELAY); 421 if (nfs4_test_locked_slot(tbl, slot->slot_nr)) 422 goto out_err; 423 424 /* Signal process_op to set this error on next op */ 425 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP); 426 if (args->csa_cachethis == 0) 427 goto out_err; 428 429 /* Liar! We never allowed you to set csa_cachethis != 0 */ 430 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY); 431 goto out_err; 432 } 433 434 /* Note: wraparound relies on seq_nr being of type u32 */ 435 /* Misordered request */ 436 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED); 437 if (args->csa_sequenceid != slot->seq_nr + 1) 438 goto out_err; 439 440 return cpu_to_be32(NFS4_OK); 441 442 out_err: 443 trace_nfs4_cb_seqid_err(args, ret); 444 return ret; 445 } 446 447 /* 448 * For each referring call triple, check the session's slot table for 449 * a match. If the slot is in use and the sequence numbers match, the 450 * client is still waiting for a response to the original request. 451 */ 452 static int referring_call_exists(struct nfs_client *clp, 453 uint32_t nrclists, 454 struct referring_call_list *rclists, 455 spinlock_t *lock) 456 __releases(lock) 457 __acquires(lock) 458 { 459 int status = 0; 460 int i, j; 461 struct nfs4_session *session; 462 struct nfs4_slot_table *tbl; 463 struct referring_call_list *rclist; 464 struct referring_call *ref; 465 466 /* 467 * XXX When client trunking is implemented, this becomes 468 * a session lookup from within the loop 469 */ 470 session = clp->cl_session; 471 tbl = &session->fc_slot_table; 472 473 for (i = 0; i < nrclists; i++) { 474 rclist = &rclists[i]; 475 if (memcmp(session->sess_id.data, 476 rclist->rcl_sessionid.data, 477 NFS4_MAX_SESSIONID_LEN) != 0) 478 continue; 479 480 for (j = 0; j < rclist->rcl_nrefcalls; j++) { 481 ref = &rclist->rcl_refcalls[j]; 482 spin_unlock(lock); 483 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, 484 ref->rc_sequenceid, HZ >> 1) < 0; 485 spin_lock(lock); 486 if (status) 487 goto out; 488 } 489 } 490 491 out: 492 return status; 493 } 494 495 __be32 nfs4_callback_sequence(void *argp, void *resp, 496 struct cb_process_state *cps) 497 { 498 struct cb_sequenceargs *args = argp; 499 struct cb_sequenceres *res = resp; 500 struct nfs4_slot_table *tbl; 501 struct nfs4_slot *slot; 502 struct nfs_client *clp; 503 int i; 504 __be32 status = htonl(NFS4ERR_BADSESSION); 505 506 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, 507 &args->csa_sessionid, cps->minorversion); 508 if (clp == NULL) 509 goto out; 510 511 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 512 goto out; 513 514 tbl = &clp->cl_session->bc_slot_table; 515 516 /* Set up res before grabbing the spinlock */ 517 memcpy(&res->csr_sessionid, &args->csa_sessionid, 518 sizeof(res->csr_sessionid)); 519 res->csr_sequenceid = args->csa_sequenceid; 520 res->csr_slotid = args->csa_slotid; 521 522 spin_lock(&tbl->slot_tbl_lock); 523 /* state manager is resetting the session */ 524 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { 525 status = htonl(NFS4ERR_DELAY); 526 /* Return NFS4ERR_BADSESSION if we're draining the session 527 * in order to reset it. 528 */ 529 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) 530 status = htonl(NFS4ERR_BADSESSION); 531 goto out_unlock; 532 } 533 534 status = htonl(NFS4ERR_BADSLOT); 535 slot = nfs4_lookup_slot(tbl, args->csa_slotid); 536 if (IS_ERR(slot)) 537 goto out_unlock; 538 539 res->csr_highestslotid = tbl->server_highest_slotid; 540 res->csr_target_highestslotid = tbl->target_highest_slotid; 541 542 status = validate_seqid(tbl, slot, args); 543 if (status) 544 goto out_unlock; 545 if (!nfs4_try_to_lock_slot(tbl, slot)) { 546 status = htonl(NFS4ERR_DELAY); 547 goto out_unlock; 548 } 549 cps->slot = slot; 550 551 /* The ca_maxresponsesize_cached is 0 with no DRC */ 552 if (args->csa_cachethis != 0) { 553 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); 554 goto out_unlock; 555 } 556 557 /* 558 * Check for pending referring calls. If a match is found, a 559 * related callback was received before the response to the original 560 * call. 561 */ 562 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists, 563 &tbl->slot_tbl_lock) < 0) { 564 status = htonl(NFS4ERR_DELAY); 565 goto out_unlock; 566 } 567 568 /* 569 * RFC5661 20.9.3 570 * If CB_SEQUENCE returns an error, then the state of the slot 571 * (sequence ID, cached reply) MUST NOT change. 572 */ 573 slot->seq_nr = args->csa_sequenceid; 574 out_unlock: 575 spin_unlock(&tbl->slot_tbl_lock); 576 577 out: 578 cps->clp = clp; /* put in nfs4_callback_compound */ 579 for (i = 0; i < args->csa_nrclists; i++) 580 kfree(args->csa_rclists[i].rcl_refcalls); 581 kfree(args->csa_rclists); 582 583 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 584 cps->drc_status = status; 585 status = 0; 586 } else 587 res->csr_status = status; 588 589 trace_nfs4_cb_sequence(args, res, status); 590 return status; 591 } 592 593 static bool 594 validate_bitmap_values(unsigned int mask) 595 { 596 return (mask & ~RCA4_TYPE_MASK_ALL) == 0; 597 } 598 599 __be32 nfs4_callback_recallany(void *argp, void *resp, 600 struct cb_process_state *cps) 601 { 602 struct cb_recallanyargs *args = argp; 603 __be32 status; 604 fmode_t flags = 0; 605 bool schedule_manager = false; 606 607 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 608 if (!cps->clp) /* set in cb_sequence */ 609 goto out; 610 611 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n", 612 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 613 614 status = cpu_to_be32(NFS4ERR_INVAL); 615 if (!validate_bitmap_values(args->craa_type_mask)) 616 goto out; 617 618 status = cpu_to_be32(NFS4_OK); 619 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG)) 620 flags = FMODE_READ; 621 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG)) 622 flags |= FMODE_WRITE; 623 if (flags) 624 nfs_expire_unused_delegation_types(cps->clp, flags); 625 626 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT)) 627 pnfs_recall_all_layouts(cps->clp); 628 629 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) { 630 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state); 631 schedule_manager = true; 632 } 633 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) { 634 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state); 635 schedule_manager = true; 636 } 637 if (schedule_manager) 638 nfs4_schedule_state_manager(cps->clp); 639 640 out: 641 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 642 return status; 643 } 644 645 /* Reduce the fore channel's max_slots to the target value */ 646 __be32 nfs4_callback_recallslot(void *argp, void *resp, 647 struct cb_process_state *cps) 648 { 649 struct cb_recallslotargs *args = argp; 650 struct nfs4_slot_table *fc_tbl; 651 __be32 status; 652 653 status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 654 if (!cps->clp) /* set in cb_sequence */ 655 goto out; 656 657 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n", 658 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), 659 args->crsa_target_highest_slotid); 660 661 fc_tbl = &cps->clp->cl_session->fc_slot_table; 662 663 status = htonl(NFS4_OK); 664 665 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid); 666 nfs41_notify_server(cps->clp); 667 out: 668 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 669 return status; 670 } 671 672 __be32 nfs4_callback_notify_lock(void *argp, void *resp, 673 struct cb_process_state *cps) 674 { 675 struct cb_notify_lock_args *args = argp; 676 677 if (!cps->clp) /* set in cb_sequence */ 678 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 679 680 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", 681 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 682 683 /* Don't wake anybody if the string looked bogus */ 684 if (args->cbnl_valid) 685 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); 686 687 return htonl(NFS4_OK); 688 } 689 #endif /* CONFIG_NFS_V4_1 */ 690 #ifdef CONFIG_NFS_V4_2 691 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state, 692 struct cb_offloadargs *args) 693 { 694 cp_state->count = args->wr_count; 695 cp_state->error = args->error; 696 if (!args->error) { 697 cp_state->verf.committed = args->wr_writeverf.committed; 698 memcpy(&cp_state->verf.verifier.data[0], 699 &args->wr_writeverf.verifier.data[0], 700 NFS4_VERIFIER_SIZE); 701 } 702 } 703 704 __be32 nfs4_callback_offload(void *data, void *dummy, 705 struct cb_process_state *cps) 706 { 707 struct cb_offloadargs *args = data; 708 struct nfs_server *server; 709 struct nfs4_copy_state *copy, *tmp_copy; 710 bool found = false; 711 712 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS); 713 if (!copy) 714 return htonl(NFS4ERR_SERVERFAULT); 715 716 spin_lock(&cps->clp->cl_lock); 717 rcu_read_lock(); 718 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks, 719 client_link) { 720 list_for_each_entry(tmp_copy, &server->ss_copies, copies) { 721 if (memcmp(args->coa_stateid.other, 722 tmp_copy->stateid.other, 723 sizeof(args->coa_stateid.other))) 724 continue; 725 nfs4_copy_cb_args(tmp_copy, args); 726 complete(&tmp_copy->completion); 727 found = true; 728 goto out; 729 } 730 } 731 out: 732 rcu_read_unlock(); 733 if (!found) { 734 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE); 735 nfs4_copy_cb_args(copy, args); 736 list_add_tail(©->copies, &cps->clp->pending_cb_stateids); 737 } else 738 kfree(copy); 739 spin_unlock(&cps->clp->cl_lock); 740 741 return 0; 742 } 743 #endif /* CONFIG_NFS_V4_2 */ 744