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 (!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 { 212 u32 oldseq, newseq; 213 214 /* Is the stateid not initialised? */ 215 if (!pnfs_layout_is_valid(lo)) 216 return NFS4ERR_NOMATCHING_LAYOUT; 217 218 /* Mismatched stateid? */ 219 if (!nfs4_stateid_match_other(&lo->plh_stateid, new)) 220 return NFS4ERR_BAD_STATEID; 221 222 newseq = be32_to_cpu(new->seqid); 223 /* Are we already in a layout recall situation? */ 224 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && 225 lo->plh_return_seq != 0) { 226 if (newseq < lo->plh_return_seq) 227 return NFS4ERR_OLD_STATEID; 228 if (newseq > lo->plh_return_seq) 229 return NFS4ERR_DELAY; 230 goto out; 231 } 232 233 /* Check that the stateid matches what we think it should be. */ 234 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 235 if (newseq > oldseq + 1) 236 return NFS4ERR_DELAY; 237 /* Crazy server! */ 238 if (newseq <= oldseq) 239 return NFS4ERR_OLD_STATEID; 240 out: 241 return NFS_OK; 242 } 243 244 static u32 initiate_file_draining(struct nfs_client *clp, 245 struct cb_layoutrecallargs *args) 246 { 247 struct inode *ino; 248 struct pnfs_layout_hdr *lo; 249 u32 rv = NFS4ERR_NOMATCHING_LAYOUT; 250 LIST_HEAD(free_me_list); 251 252 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid); 253 if (IS_ERR(ino)) { 254 if (ino == ERR_PTR(-EAGAIN)) 255 rv = NFS4ERR_DELAY; 256 goto out_noput; 257 } 258 259 pnfs_layoutcommit_inode(ino, false); 260 261 262 spin_lock(&ino->i_lock); 263 lo = NFS_I(ino)->layout; 264 if (!lo) { 265 spin_unlock(&ino->i_lock); 266 goto out; 267 } 268 pnfs_get_layout_hdr(lo); 269 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid); 270 if (rv != NFS_OK) 271 goto unlock; 272 273 /* 274 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return) 275 */ 276 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 277 rv = NFS4ERR_DELAY; 278 goto unlock; 279 } 280 281 pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true); 282 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list, 283 &args->cbl_range, 284 be32_to_cpu(args->cbl_stateid.seqid))) { 285 case 0: 286 case -EBUSY: 287 /* There are layout segments that need to be returned */ 288 rv = NFS4_OK; 289 break; 290 case -ENOENT: 291 /* Embrace your forgetfulness! */ 292 rv = NFS4ERR_NOMATCHING_LAYOUT; 293 294 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 295 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, 296 &args->cbl_range); 297 } 298 } 299 unlock: 300 spin_unlock(&ino->i_lock); 301 pnfs_free_lseg_list(&free_me_list); 302 /* Free all lsegs that are attached to commit buckets */ 303 nfs_commit_inode(ino, 0); 304 pnfs_put_layout_hdr(lo); 305 out: 306 nfs_iput_and_deactive(ino); 307 out_noput: 308 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino, 309 &args->cbl_stateid, -rv); 310 return rv; 311 } 312 313 static u32 initiate_bulk_draining(struct nfs_client *clp, 314 struct cb_layoutrecallargs *args) 315 { 316 int stat; 317 318 if (args->cbl_recall_type == RETURN_FSID) 319 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true); 320 else 321 stat = pnfs_destroy_layouts_byclid(clp, true); 322 if (stat != 0) 323 return NFS4ERR_DELAY; 324 return NFS4ERR_NOMATCHING_LAYOUT; 325 } 326 327 static u32 do_callback_layoutrecall(struct nfs_client *clp, 328 struct cb_layoutrecallargs *args) 329 { 330 if (args->cbl_recall_type == RETURN_FILE) 331 return initiate_file_draining(clp, args); 332 return initiate_bulk_draining(clp, args); 333 } 334 335 __be32 nfs4_callback_layoutrecall(void *argp, void *resp, 336 struct cb_process_state *cps) 337 { 338 struct cb_layoutrecallargs *args = argp; 339 u32 res = NFS4ERR_OP_NOT_IN_SESSION; 340 341 if (cps->clp) 342 res = do_callback_layoutrecall(cps->clp, args); 343 return cpu_to_be32(res); 344 } 345 346 static void pnfs_recall_all_layouts(struct nfs_client *clp) 347 { 348 struct cb_layoutrecallargs args; 349 350 /* Pretend we got a CB_LAYOUTRECALL(ALL) */ 351 memset(&args, 0, sizeof(args)); 352 args.cbl_recall_type = RETURN_ALL; 353 /* FIXME we ignore errors, what should we do? */ 354 do_callback_layoutrecall(clp, &args); 355 } 356 357 __be32 nfs4_callback_devicenotify(void *argp, void *resp, 358 struct cb_process_state *cps) 359 { 360 struct cb_devicenotifyargs *args = argp; 361 const struct pnfs_layoutdriver_type *ld = NULL; 362 uint32_t i; 363 __be32 res = 0; 364 365 if (!cps->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 (!ld || ld->id != dev->cbd_layout_type) { 374 pnfs_put_layoutdriver(ld); 375 ld = pnfs_find_layoutdriver(dev->cbd_layout_type); 376 if (!ld) 377 continue; 378 } 379 nfs4_delete_deviceid(ld, cps->clp, &dev->cbd_dev_id); 380 } 381 pnfs_put_layoutdriver(ld); 382 out: 383 kfree(args->devs); 384 return res; 385 } 386 387 /* 388 * Validate the sequenceID sent by the server. 389 * Return success if the sequenceID is one more than what we last saw on 390 * this slot, accounting for wraparound. Increments the slot's sequence. 391 * 392 * We don't yet implement a duplicate request cache, instead we set the 393 * back channel ca_maxresponsesize_cached to zero. This is OK for now 394 * since we only currently implement idempotent callbacks anyway. 395 * 396 * We have a single slot backchannel at this time, so we don't bother 397 * checking the used_slots bit array on the table. The lower layer guarantees 398 * a single outstanding callback request at a time. 399 */ 400 static __be32 401 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, 402 const struct cb_sequenceargs * args) 403 { 404 __be32 ret; 405 406 ret = cpu_to_be32(NFS4ERR_BADSLOT); 407 if (args->csa_slotid > tbl->server_highest_slotid) 408 goto out_err; 409 410 /* Replay */ 411 if (args->csa_sequenceid == slot->seq_nr) { 412 ret = cpu_to_be32(NFS4ERR_DELAY); 413 if (nfs4_test_locked_slot(tbl, slot->slot_nr)) 414 goto out_err; 415 416 /* Signal process_op to set this error on next op */ 417 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP); 418 if (args->csa_cachethis == 0) 419 goto out_err; 420 421 /* Liar! We never allowed you to set csa_cachethis != 0 */ 422 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY); 423 goto out_err; 424 } 425 426 /* Note: wraparound relies on seq_nr being of type u32 */ 427 /* Misordered request */ 428 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED); 429 if (args->csa_sequenceid != slot->seq_nr + 1) 430 goto out_err; 431 432 return cpu_to_be32(NFS4_OK); 433 434 out_err: 435 trace_nfs4_cb_seqid_err(args, ret); 436 return ret; 437 } 438 439 /* 440 * For each referring call triple, check the session's slot table for 441 * a match. If the slot is in use and the sequence numbers match, the 442 * client is still waiting for a response to the original request. 443 */ 444 static int referring_call_exists(struct nfs_client *clp, 445 uint32_t nrclists, 446 struct referring_call_list *rclists, 447 spinlock_t *lock) 448 __releases(lock) 449 __acquires(lock) 450 { 451 int status = 0; 452 int i, j; 453 struct nfs4_session *session; 454 struct nfs4_slot_table *tbl; 455 struct referring_call_list *rclist; 456 struct referring_call *ref; 457 458 /* 459 * XXX When client trunking is implemented, this becomes 460 * a session lookup from within the loop 461 */ 462 session = clp->cl_session; 463 tbl = &session->fc_slot_table; 464 465 for (i = 0; i < nrclists; i++) { 466 rclist = &rclists[i]; 467 if (memcmp(session->sess_id.data, 468 rclist->rcl_sessionid.data, 469 NFS4_MAX_SESSIONID_LEN) != 0) 470 continue; 471 472 for (j = 0; j < rclist->rcl_nrefcalls; j++) { 473 ref = &rclist->rcl_refcalls[j]; 474 spin_unlock(lock); 475 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, 476 ref->rc_sequenceid, HZ >> 1) < 0; 477 spin_lock(lock); 478 if (status) 479 goto out; 480 } 481 } 482 483 out: 484 return status; 485 } 486 487 __be32 nfs4_callback_sequence(void *argp, void *resp, 488 struct cb_process_state *cps) 489 { 490 struct cb_sequenceargs *args = argp; 491 struct cb_sequenceres *res = resp; 492 struct nfs4_slot_table *tbl; 493 struct nfs4_slot *slot; 494 struct nfs_client *clp; 495 int i; 496 __be32 status = htonl(NFS4ERR_BADSESSION); 497 498 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, 499 &args->csa_sessionid, cps->minorversion); 500 if (clp == NULL) 501 goto out; 502 503 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 504 goto out; 505 506 tbl = &clp->cl_session->bc_slot_table; 507 508 /* Set up res before grabbing the spinlock */ 509 memcpy(&res->csr_sessionid, &args->csa_sessionid, 510 sizeof(res->csr_sessionid)); 511 res->csr_sequenceid = args->csa_sequenceid; 512 res->csr_slotid = args->csa_slotid; 513 514 spin_lock(&tbl->slot_tbl_lock); 515 /* state manager is resetting the session */ 516 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { 517 status = htonl(NFS4ERR_DELAY); 518 /* Return NFS4ERR_BADSESSION if we're draining the session 519 * in order to reset it. 520 */ 521 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) 522 status = htonl(NFS4ERR_BADSESSION); 523 goto out_unlock; 524 } 525 526 status = htonl(NFS4ERR_BADSLOT); 527 slot = nfs4_lookup_slot(tbl, args->csa_slotid); 528 if (IS_ERR(slot)) 529 goto out_unlock; 530 531 res->csr_highestslotid = tbl->server_highest_slotid; 532 res->csr_target_highestslotid = tbl->target_highest_slotid; 533 534 status = validate_seqid(tbl, slot, args); 535 if (status) 536 goto out_unlock; 537 if (!nfs4_try_to_lock_slot(tbl, slot)) { 538 status = htonl(NFS4ERR_DELAY); 539 goto out_unlock; 540 } 541 cps->slot = slot; 542 543 /* The ca_maxresponsesize_cached is 0 with no DRC */ 544 if (args->csa_cachethis != 0) { 545 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); 546 goto out_unlock; 547 } 548 549 /* 550 * Check for pending referring calls. If a match is found, a 551 * related callback was received before the response to the original 552 * call. 553 */ 554 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists, 555 &tbl->slot_tbl_lock) < 0) { 556 status = htonl(NFS4ERR_DELAY); 557 goto out_unlock; 558 } 559 560 /* 561 * RFC5661 20.9.3 562 * If CB_SEQUENCE returns an error, then the state of the slot 563 * (sequence ID, cached reply) MUST NOT change. 564 */ 565 slot->seq_nr = args->csa_sequenceid; 566 out_unlock: 567 spin_unlock(&tbl->slot_tbl_lock); 568 569 out: 570 cps->clp = clp; /* put in nfs4_callback_compound */ 571 for (i = 0; i < args->csa_nrclists; i++) 572 kfree(args->csa_rclists[i].rcl_refcalls); 573 kfree(args->csa_rclists); 574 575 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 576 cps->drc_status = status; 577 status = 0; 578 } else 579 res->csr_status = status; 580 581 trace_nfs4_cb_sequence(args, res, status); 582 return status; 583 } 584 585 static bool 586 validate_bitmap_values(unsigned int mask) 587 { 588 return (mask & ~RCA4_TYPE_MASK_ALL) == 0; 589 } 590 591 __be32 nfs4_callback_recallany(void *argp, void *resp, 592 struct cb_process_state *cps) 593 { 594 struct cb_recallanyargs *args = argp; 595 __be32 status; 596 fmode_t flags = 0; 597 bool schedule_manager = false; 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); 620 621 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) { 622 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state); 623 schedule_manager = true; 624 } 625 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) { 626 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state); 627 schedule_manager = true; 628 } 629 if (schedule_manager) 630 nfs4_schedule_state_manager(cps->clp); 631 632 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_KERNEL); 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 trace_nfs4_cb_offload(&args->coa_fh, &args->coa_stateid, 734 args->wr_count, args->error, 735 args->wr_writeverf.committed); 736 return 0; 737 } 738 #endif /* CONFIG_NFS_V4_2 */ 739