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_get_ctime(inode); 63 res->mtime = inode_get_mtime(inode); 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 (!nfs4_stateid_match_other(stateid, &lo->plh_stateid)) 141 continue; 142 if (nfs_sb_active(server->super)) 143 inode = igrab(lo->plh_inode); 144 else 145 inode = ERR_PTR(-EAGAIN); 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 inode = igrab(lo->plh_inode); 181 else 182 inode = ERR_PTR(-EAGAIN); 183 rcu_read_unlock(); 184 if (inode) 185 return inode; 186 nfs_sb_deactive(server->super); 187 return ERR_PTR(-EAGAIN); 188 } 189 } 190 rcu_read_unlock(); 191 return ERR_PTR(-ENOENT); 192 } 193 194 static struct inode *nfs_layout_find_inode(struct nfs_client *clp, 195 const struct nfs_fh *fh, 196 const nfs4_stateid *stateid) 197 { 198 struct inode *inode; 199 200 inode = nfs_layout_find_inode_by_stateid(clp, stateid); 201 if (inode == ERR_PTR(-ENOENT)) 202 inode = nfs_layout_find_inode_by_fh(clp, fh); 203 return inode; 204 } 205 206 /* 207 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing) 208 */ 209 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo, 210 const nfs4_stateid *new, 211 struct cb_process_state *cps) 212 { 213 u32 oldseq, newseq; 214 215 /* Is the stateid not initialised? */ 216 if (!pnfs_layout_is_valid(lo)) 217 return NFS4ERR_NOMATCHING_LAYOUT; 218 219 /* Mismatched stateid? */ 220 if (!nfs4_stateid_match_other(&lo->plh_stateid, new)) 221 return NFS4ERR_BAD_STATEID; 222 223 newseq = be32_to_cpu(new->seqid); 224 /* Are we already in a layout recall situation? */ 225 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) 226 return NFS4ERR_DELAY; 227 228 /* 229 * Check that the stateid matches what we think it should be. 230 * Note that if the server sent us a list of referring calls, 231 * and we know that those have completed, then we trust the 232 * stateid argument is correct. 233 */ 234 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 235 if (newseq > oldseq + 1 && !cps->referring_calls) 236 return NFS4ERR_DELAY; 237 238 /* Crazy server! */ 239 if (newseq <= oldseq) 240 return NFS4ERR_OLD_STATEID; 241 242 return NFS_OK; 243 } 244 245 static u32 initiate_file_draining(struct nfs_client *clp, 246 struct cb_layoutrecallargs *args, 247 struct cb_process_state *cps) 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, cps); 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, NULL, 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 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags); 294 /* Embrace your forgetfulness! */ 295 rv = NFS4ERR_NOMATCHING_LAYOUT; 296 297 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 298 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, 299 &args->cbl_range); 300 } 301 } 302 unlock: 303 spin_unlock(&ino->i_lock); 304 pnfs_free_lseg_list(&free_me_list); 305 /* Free all lsegs that are attached to commit buckets */ 306 nfs_commit_inode(ino, 0); 307 pnfs_put_layout_hdr(lo); 308 out: 309 nfs_iput_and_deactive(ino); 310 out_noput: 311 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino, 312 &args->cbl_stateid, -rv); 313 return rv; 314 } 315 316 static u32 initiate_bulk_draining(struct nfs_client *clp, 317 struct cb_layoutrecallargs *args) 318 { 319 int stat; 320 321 if (args->cbl_recall_type == RETURN_FSID) 322 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true); 323 else 324 stat = pnfs_destroy_layouts_byclid(clp, true); 325 if (stat != 0) 326 return NFS4ERR_DELAY; 327 return NFS4ERR_NOMATCHING_LAYOUT; 328 } 329 330 static u32 do_callback_layoutrecall(struct nfs_client *clp, 331 struct cb_layoutrecallargs *args, 332 struct cb_process_state *cps) 333 { 334 if (args->cbl_recall_type == RETURN_FILE) 335 return initiate_file_draining(clp, args, cps); 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, cps); 347 return cpu_to_be32(res); 348 } 349 350 static void pnfs_recall_all_layouts(struct nfs_client *clp, 351 struct cb_process_state *cps) 352 { 353 struct cb_layoutrecallargs args; 354 355 /* Pretend we got a CB_LAYOUTRECALL(ALL) */ 356 memset(&args, 0, sizeof(args)); 357 args.cbl_recall_type = RETURN_ALL; 358 /* FIXME we ignore errors, what should we do? */ 359 do_callback_layoutrecall(clp, &args, cps); 360 } 361 362 __be32 nfs4_callback_devicenotify(void *argp, void *resp, 363 struct cb_process_state *cps) 364 { 365 struct cb_devicenotifyargs *args = argp; 366 const struct pnfs_layoutdriver_type *ld = NULL; 367 uint32_t i; 368 __be32 res = 0; 369 370 if (!cps->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 (!ld || ld->id != dev->cbd_layout_type) { 379 pnfs_put_layoutdriver(ld); 380 ld = pnfs_find_layoutdriver(dev->cbd_layout_type); 381 if (!ld) 382 continue; 383 } 384 nfs4_delete_deviceid(ld, cps->clp, &dev->cbd_dev_id); 385 } 386 pnfs_put_layoutdriver(ld); 387 out: 388 kfree(args->devs); 389 return res; 390 } 391 392 /* 393 * Validate the sequenceID sent by the server. 394 * Return success if the sequenceID is one more than what we last saw on 395 * this slot, accounting for wraparound. Increments the slot's sequence. 396 * 397 * We don't yet implement a duplicate request cache, instead we set the 398 * back channel ca_maxresponsesize_cached to zero. This is OK for now 399 * since we only currently implement idempotent callbacks anyway. 400 * 401 * We have a single slot backchannel at this time, so we don't bother 402 * checking the used_slots bit array on the table. The lower layer guarantees 403 * a single outstanding callback request at a time. 404 */ 405 static __be32 406 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, 407 const struct cb_sequenceargs * args) 408 { 409 __be32 ret; 410 411 ret = cpu_to_be32(NFS4ERR_BADSLOT); 412 if (args->csa_slotid > tbl->server_highest_slotid) 413 goto out_err; 414 415 /* Replay */ 416 if (args->csa_sequenceid == slot->seq_nr) { 417 ret = cpu_to_be32(NFS4ERR_DELAY); 418 if (nfs4_test_locked_slot(tbl, slot->slot_nr)) 419 goto out_err; 420 421 /* Signal process_op to set this error on next op */ 422 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP); 423 if (args->csa_cachethis == 0) 424 goto out_err; 425 426 /* Liar! We never allowed you to set csa_cachethis != 0 */ 427 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY); 428 goto out_err; 429 } 430 431 /* Note: wraparound relies on seq_nr being of type u32 */ 432 /* Misordered request */ 433 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED); 434 if (args->csa_sequenceid != slot->seq_nr + 1) 435 goto out_err; 436 437 return cpu_to_be32(NFS4_OK); 438 439 out_err: 440 trace_nfs4_cb_seqid_err(args, ret); 441 return ret; 442 } 443 444 /* 445 * For each referring call triple, check the session's slot table for 446 * a match. If the slot is in use and the sequence numbers match, the 447 * client is still waiting for a response to the original request. 448 */ 449 static int referring_call_exists(struct nfs_client *clp, 450 uint32_t nrclists, 451 struct referring_call_list *rclists, 452 spinlock_t *lock) 453 __releases(lock) 454 __acquires(lock) 455 { 456 int status = 0; 457 int found = 0; 458 int i, j; 459 struct nfs4_session *session; 460 struct nfs4_slot_table *tbl; 461 struct referring_call_list *rclist; 462 struct referring_call *ref; 463 464 /* 465 * XXX When client trunking is implemented, this becomes 466 * a session lookup from within the loop 467 */ 468 session = clp->cl_session; 469 tbl = &session->fc_slot_table; 470 471 for (i = 0; i < nrclists; i++) { 472 rclist = &rclists[i]; 473 if (memcmp(session->sess_id.data, 474 rclist->rcl_sessionid.data, 475 NFS4_MAX_SESSIONID_LEN) != 0) 476 continue; 477 478 for (j = 0; j < rclist->rcl_nrefcalls; j++) { 479 ref = &rclist->rcl_refcalls[j]; 480 spin_unlock(lock); 481 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, 482 ref->rc_sequenceid, HZ >> 1) < 0; 483 spin_lock(lock); 484 if (status) 485 goto out; 486 found++; 487 } 488 } 489 490 out: 491 return status < 0 ? status : found; 492 } 493 494 __be32 nfs4_callback_sequence(void *argp, void *resp, 495 struct cb_process_state *cps) 496 { 497 struct cb_sequenceargs *args = argp; 498 struct cb_sequenceres *res = resp; 499 struct nfs4_slot_table *tbl; 500 struct nfs4_slot *slot; 501 struct nfs_client *clp; 502 int ret; 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 ret = referring_call_exists(clp, args->csa_nrclists, args->csa_rclists, 563 &tbl->slot_tbl_lock); 564 if (ret < 0) { 565 status = htonl(NFS4ERR_DELAY); 566 goto out_unlock; 567 } 568 cps->referring_calls = ret; 569 570 /* 571 * RFC5661 20.9.3 572 * If CB_SEQUENCE returns an error, then the state of the slot 573 * (sequence ID, cached reply) MUST NOT change. 574 */ 575 slot->seq_nr = args->csa_sequenceid; 576 out_unlock: 577 spin_unlock(&tbl->slot_tbl_lock); 578 579 out: 580 cps->clp = clp; /* put in nfs4_callback_compound */ 581 for (i = 0; i < args->csa_nrclists; i++) 582 kfree(args->csa_rclists[i].rcl_refcalls); 583 kfree(args->csa_rclists); 584 585 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 586 cps->drc_status = status; 587 status = 0; 588 } else 589 res->csr_status = status; 590 591 trace_nfs4_cb_sequence(args, res, status); 592 return status; 593 } 594 595 static bool 596 validate_bitmap_values(unsigned int mask) 597 { 598 return (mask & ~RCA4_TYPE_MASK_ALL) == 0; 599 } 600 601 __be32 nfs4_callback_recallany(void *argp, void *resp, 602 struct cb_process_state *cps) 603 { 604 struct cb_recallanyargs *args = argp; 605 __be32 status; 606 fmode_t flags = 0; 607 bool schedule_manager = false; 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, cps); 630 631 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) { 632 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state); 633 schedule_manager = true; 634 } 635 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) { 636 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state); 637 schedule_manager = true; 638 } 639 if (schedule_manager) 640 nfs4_schedule_state_manager(cps->clp); 641 642 out: 643 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 644 return status; 645 } 646 647 /* Reduce the fore channel's max_slots to the target value */ 648 __be32 nfs4_callback_recallslot(void *argp, void *resp, 649 struct cb_process_state *cps) 650 { 651 struct cb_recallslotargs *args = argp; 652 struct nfs4_slot_table *fc_tbl; 653 __be32 status; 654 655 status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 656 if (!cps->clp) /* set in cb_sequence */ 657 goto out; 658 659 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n", 660 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), 661 args->crsa_target_highest_slotid); 662 663 fc_tbl = &cps->clp->cl_session->fc_slot_table; 664 665 status = htonl(NFS4_OK); 666 667 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid); 668 nfs41_notify_server(cps->clp); 669 out: 670 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 671 return status; 672 } 673 674 __be32 nfs4_callback_notify_lock(void *argp, void *resp, 675 struct cb_process_state *cps) 676 { 677 struct cb_notify_lock_args *args = argp; 678 679 if (!cps->clp) /* set in cb_sequence */ 680 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 681 682 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", 683 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 684 685 /* Don't wake anybody if the string looked bogus */ 686 if (args->cbnl_valid) 687 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); 688 689 return htonl(NFS4_OK); 690 } 691 #endif /* CONFIG_NFS_V4_1 */ 692 #ifdef CONFIG_NFS_V4_2 693 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state, 694 struct cb_offloadargs *args) 695 { 696 cp_state->count = args->wr_count; 697 cp_state->error = args->error; 698 if (!args->error) { 699 cp_state->verf.committed = args->wr_writeverf.committed; 700 memcpy(&cp_state->verf.verifier.data[0], 701 &args->wr_writeverf.verifier.data[0], 702 NFS4_VERIFIER_SIZE); 703 } 704 } 705 706 __be32 nfs4_callback_offload(void *data, void *dummy, 707 struct cb_process_state *cps) 708 { 709 struct cb_offloadargs *args = data; 710 struct nfs_server *server; 711 struct nfs4_copy_state *copy, *tmp_copy; 712 bool found = false; 713 714 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_KERNEL); 715 if (!copy) 716 return htonl(NFS4ERR_SERVERFAULT); 717 718 spin_lock(&cps->clp->cl_lock); 719 rcu_read_lock(); 720 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks, 721 client_link) { 722 list_for_each_entry(tmp_copy, &server->ss_copies, copies) { 723 if (memcmp(args->coa_stateid.other, 724 tmp_copy->stateid.other, 725 sizeof(args->coa_stateid.other))) 726 continue; 727 nfs4_copy_cb_args(tmp_copy, args); 728 complete(&tmp_copy->completion); 729 found = true; 730 goto out; 731 } 732 } 733 out: 734 rcu_read_unlock(); 735 if (!found) { 736 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE); 737 nfs4_copy_cb_args(copy, args); 738 list_add_tail(©->copies, &cps->clp->pending_cb_stateids); 739 } else 740 kfree(copy); 741 spin_unlock(&cps->clp->cl_lock); 742 743 trace_nfs4_cb_offload(&args->coa_fh, &args->coa_stateid, 744 args->wr_count, args->error, 745 args->wr_writeverf.committed); 746 return 0; 747 } 748 #endif /* CONFIG_NFS_V4_2 */ 749