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 inode *inode; 30 31 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 32 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 33 goto out; 34 35 res->bitmap[0] = res->bitmap[1] = 0; 36 res->status = htonl(NFS4ERR_BADHANDLE); 37 38 dprintk_rcu("NFS: GETATTR callback request from %s\n", 39 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 40 41 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 42 if (IS_ERR(inode)) { 43 if (inode == ERR_PTR(-EAGAIN)) 44 res->status = htonl(NFS4ERR_DELAY); 45 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL, 46 -ntohl(res->status)); 47 goto out; 48 } 49 rcu_read_lock(); 50 delegation = nfs4_get_valid_delegation(inode); 51 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0) 52 goto out_iput; 53 res->size = i_size_read(inode); 54 res->change_attr = delegation->change_attr; 55 if (nfs_have_writebacks(inode)) 56 res->change_attr++; 57 res->ctime = inode->i_ctime; 58 res->mtime = inode->i_mtime; 59 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) & 60 args->bitmap[0]; 61 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) & 62 args->bitmap[1]; 63 res->status = 0; 64out_iput: 65 rcu_read_unlock(); 66 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status)); 67 nfs_iput_and_deactive(inode); 68out: 69 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); 70 return res->status; 71} 72 73__be32 nfs4_callback_recall(void *argp, void *resp, 74 struct cb_process_state *cps) 75{ 76 struct cb_recallargs *args = argp; 77 struct inode *inode; 78 __be32 res; 79 80 res = htonl(NFS4ERR_OP_NOT_IN_SESSION); 81 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 82 goto out; 83 84 dprintk_rcu("NFS: RECALL callback request from %s\n", 85 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 86 87 res = htonl(NFS4ERR_BADHANDLE); 88 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 89 if (IS_ERR(inode)) { 90 if (inode == ERR_PTR(-EAGAIN)) 91 res = htonl(NFS4ERR_DELAY); 92 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL, 93 &args->stateid, -ntohl(res)); 94 goto out; 95 } 96 /* Set up a helper thread to actually return the delegation */ 97 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { 98 case 0: 99 res = 0; 100 break; 101 case -ENOENT: 102 res = htonl(NFS4ERR_BAD_STATEID); 103 break; 104 default: 105 res = htonl(NFS4ERR_RESOURCE); 106 } 107 trace_nfs4_cb_recall(cps->clp, &args->fh, inode, 108 &args->stateid, -ntohl(res)); 109 nfs_iput_and_deactive(inode); 110out: 111 dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); 112 return res; 113} 114 115#if defined(CONFIG_NFS_V4_1) 116 117/* 118 * Lookup a layout inode by stateid 119 * 120 * Note: returns a refcount on the inode and superblock 121 */ 122static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp, 123 const nfs4_stateid *stateid) 124 __must_hold(RCU) 125{ 126 struct nfs_server *server; 127 struct inode *inode; 128 struct pnfs_layout_hdr *lo; 129 130 rcu_read_lock(); 131 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 132 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 133 if (!pnfs_layout_is_valid(lo)) 134 continue; 135 if (!nfs4_stateid_match_other(stateid, &lo->plh_stateid)) 136 continue; 137 if (nfs_sb_active(server->super)) 138 inode = igrab(lo->plh_inode); 139 else 140 inode = ERR_PTR(-EAGAIN); 141 rcu_read_unlock(); 142 if (inode) 143 return inode; 144 nfs_sb_deactive(server->super); 145 return ERR_PTR(-EAGAIN); 146 } 147 } 148 rcu_read_unlock(); 149 return ERR_PTR(-ENOENT); 150} 151 152/* 153 * Lookup a layout inode by filehandle. 154 * 155 * Note: returns a refcount on the inode and superblock 156 * 157 */ 158static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp, 159 const struct nfs_fh *fh) 160{ 161 struct nfs_server *server; 162 struct nfs_inode *nfsi; 163 struct inode *inode; 164 struct pnfs_layout_hdr *lo; 165 166 rcu_read_lock(); 167 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 168 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 169 nfsi = NFS_I(lo->plh_inode); 170 if (nfs_compare_fh(fh, &nfsi->fh)) 171 continue; 172 if (nfsi->layout != lo) 173 continue; 174 if (nfs_sb_active(server->super)) 175 inode = igrab(lo->plh_inode); 176 else 177 inode = ERR_PTR(-EAGAIN); 178 rcu_read_unlock(); 179 if (inode) 180 return inode; 181 nfs_sb_deactive(server->super); 182 return ERR_PTR(-EAGAIN); 183 } 184 } 185 rcu_read_unlock(); 186 return ERR_PTR(-ENOENT); 187} 188 189static struct inode *nfs_layout_find_inode(struct nfs_client *clp, 190 const struct nfs_fh *fh, 191 const nfs4_stateid *stateid) 192{ 193 struct inode *inode; 194 195 inode = nfs_layout_find_inode_by_stateid(clp, stateid); 196 if (inode == ERR_PTR(-ENOENT)) 197 inode = nfs_layout_find_inode_by_fh(clp, fh); 198 return inode; 199} 200 201/* 202 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing) 203 */ 204static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo, 205 const nfs4_stateid *new) 206{ 207 u32 oldseq, newseq; 208 209 /* Is the stateid not initialised? */ 210 if (!pnfs_layout_is_valid(lo)) 211 return NFS4ERR_NOMATCHING_LAYOUT; 212 213 /* Mismatched stateid? */ 214 if (!nfs4_stateid_match_other(&lo->plh_stateid, new)) 215 return NFS4ERR_BAD_STATEID; 216 217 newseq = be32_to_cpu(new->seqid); 218 /* Are we already in a layout recall situation? */ 219 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && 220 lo->plh_return_seq != 0) { 221 if (newseq < lo->plh_return_seq) 222 return NFS4ERR_OLD_STATEID; 223 if (newseq > lo->plh_return_seq) 224 return NFS4ERR_DELAY; 225 goto out; 226 } 227 228 /* Check that the stateid matches what we think it should be. */ 229 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 230 if (newseq > oldseq + 1) 231 return NFS4ERR_DELAY; 232 /* Crazy server! */ 233 if (newseq <= oldseq) 234 return NFS4ERR_OLD_STATEID; 235out: 236 return NFS_OK; 237} 238 239static u32 initiate_file_draining(struct nfs_client *clp, 240 struct cb_layoutrecallargs *args) 241{ 242 struct inode *ino; 243 struct pnfs_layout_hdr *lo; 244 u32 rv = NFS4ERR_NOMATCHING_LAYOUT; 245 LIST_HEAD(free_me_list); 246 247 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid); 248 if (IS_ERR(ino)) { 249 if (ino == ERR_PTR(-EAGAIN)) 250 rv = NFS4ERR_DELAY; 251 goto out_noput; 252 } 253 254 pnfs_layoutcommit_inode(ino, false); 255 256 257 spin_lock(&ino->i_lock); 258 lo = NFS_I(ino)->layout; 259 if (!lo) { 260 spin_unlock(&ino->i_lock); 261 goto out; 262 } 263 pnfs_get_layout_hdr(lo); 264 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid); 265 if (rv != NFS_OK) 266 goto unlock; 267 268 /* 269 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return) 270 */ 271 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 272 rv = NFS4ERR_DELAY; 273 goto unlock; 274 } 275 276 pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true); 277 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list, 278 &args->cbl_range, 279 be32_to_cpu(args->cbl_stateid.seqid))) { 280 case 0: 281 case -EBUSY: 282 /* There are layout segments that need to be returned */ 283 rv = NFS4_OK; 284 break; 285 case -ENOENT: 286 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags); 287 /* Embrace your forgetfulness! */ 288 rv = NFS4ERR_NOMATCHING_LAYOUT; 289 290 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 291 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, 292 &args->cbl_range); 293 } 294 } 295unlock: 296 spin_unlock(&ino->i_lock); 297 pnfs_free_lseg_list(&free_me_list); 298 /* Free all lsegs that are attached to commit buckets */ 299 nfs_commit_inode(ino, 0); 300 pnfs_put_layout_hdr(lo); 301out: 302 nfs_iput_and_deactive(ino); 303out_noput: 304 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino, 305 &args->cbl_stateid, -rv); 306 return rv; 307} 308 309static u32 initiate_bulk_draining(struct nfs_client *clp, 310 struct cb_layoutrecallargs *args) 311{ 312 int stat; 313 314 if (args->cbl_recall_type == RETURN_FSID) 315 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true); 316 else 317 stat = pnfs_destroy_layouts_byclid(clp, true); 318 if (stat != 0) 319 return NFS4ERR_DELAY; 320 return NFS4ERR_NOMATCHING_LAYOUT; 321} 322 323static u32 do_callback_layoutrecall(struct nfs_client *clp, 324 struct cb_layoutrecallargs *args) 325{ 326 if (args->cbl_recall_type == RETURN_FILE) 327 return initiate_file_draining(clp, args); 328 return initiate_bulk_draining(clp, args); 329} 330 331__be32 nfs4_callback_layoutrecall(void *argp, void *resp, 332 struct cb_process_state *cps) 333{ 334 struct cb_layoutrecallargs *args = argp; 335 u32 res = NFS4ERR_OP_NOT_IN_SESSION; 336 337 if (cps->clp) 338 res = do_callback_layoutrecall(cps->clp, args); 339 return cpu_to_be32(res); 340} 341 342static void pnfs_recall_all_layouts(struct nfs_client *clp) 343{ 344 struct cb_layoutrecallargs args; 345 346 /* Pretend we got a CB_LAYOUTRECALL(ALL) */ 347 memset(&args, 0, sizeof(args)); 348 args.cbl_recall_type = RETURN_ALL; 349 /* FIXME we ignore errors, what should we do? */ 350 do_callback_layoutrecall(clp, &args); 351} 352 353__be32 nfs4_callback_devicenotify(void *argp, void *resp, 354 struct cb_process_state *cps) 355{ 356 struct cb_devicenotifyargs *args = argp; 357 const struct pnfs_layoutdriver_type *ld = NULL; 358 uint32_t i; 359 __be32 res = 0; 360 361 if (!cps->clp) { 362 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 363 goto out; 364 } 365 366 for (i = 0; i < args->ndevs; i++) { 367 struct cb_devicenotifyitem *dev = &args->devs[i]; 368 369 if (!ld || ld->id != dev->cbd_layout_type) { 370 pnfs_put_layoutdriver(ld); 371 ld = pnfs_find_layoutdriver(dev->cbd_layout_type); 372 if (!ld) 373 continue; 374 } 375 nfs4_delete_deviceid(ld, cps->clp, &dev->cbd_dev_id); 376 } 377 pnfs_put_layoutdriver(ld); 378out: 379 kfree(args->devs); 380 return res; 381} 382 383/* 384 * Validate the sequenceID sent by the server. 385 * Return success if the sequenceID is one more than what we last saw on 386 * this slot, accounting for wraparound. Increments the slot's sequence. 387 * 388 * We don't yet implement a duplicate request cache, instead we set the 389 * back channel ca_maxresponsesize_cached to zero. This is OK for now 390 * since we only currently implement idempotent callbacks anyway. 391 * 392 * We have a single slot backchannel at this time, so we don't bother 393 * checking the used_slots bit array on the table. The lower layer guarantees 394 * a single outstanding callback request at a time. 395 */ 396static __be32 397validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, 398 const struct cb_sequenceargs * args) 399{ 400 __be32 ret; 401 402 ret = cpu_to_be32(NFS4ERR_BADSLOT); 403 if (args->csa_slotid > tbl->server_highest_slotid) 404 goto out_err; 405 406 /* Replay */ 407 if (args->csa_sequenceid == slot->seq_nr) { 408 ret = cpu_to_be32(NFS4ERR_DELAY); 409 if (nfs4_test_locked_slot(tbl, slot->slot_nr)) 410 goto out_err; 411 412 /* Signal process_op to set this error on next op */ 413 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP); 414 if (args->csa_cachethis == 0) 415 goto out_err; 416 417 /* Liar! We never allowed you to set csa_cachethis != 0 */ 418 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY); 419 goto out_err; 420 } 421 422 /* Note: wraparound relies on seq_nr being of type u32 */ 423 /* Misordered request */ 424 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED); 425 if (args->csa_sequenceid != slot->seq_nr + 1) 426 goto out_err; 427 428 return cpu_to_be32(NFS4_OK); 429 430out_err: 431 trace_nfs4_cb_seqid_err(args, ret); 432 return ret; 433} 434 435/* 436 * For each referring call triple, check the session's slot table for 437 * a match. If the slot is in use and the sequence numbers match, the 438 * client is still waiting for a response to the original request. 439 */ 440static int referring_call_exists(struct nfs_client *clp, 441 uint32_t nrclists, 442 struct referring_call_list *rclists, 443 spinlock_t *lock) 444 __releases(lock) 445 __acquires(lock) 446{ 447 int status = 0; 448 int i, j; 449 struct nfs4_session *session; 450 struct nfs4_slot_table *tbl; 451 struct referring_call_list *rclist; 452 struct referring_call *ref; 453 454 /* 455 * XXX When client trunking is implemented, this becomes 456 * a session lookup from within the loop 457 */ 458 session = clp->cl_session; 459 tbl = &session->fc_slot_table; 460 461 for (i = 0; i < nrclists; i++) { 462 rclist = &rclists[i]; 463 if (memcmp(session->sess_id.data, 464 rclist->rcl_sessionid.data, 465 NFS4_MAX_SESSIONID_LEN) != 0) 466 continue; 467 468 for (j = 0; j < rclist->rcl_nrefcalls; j++) { 469 ref = &rclist->rcl_refcalls[j]; 470 spin_unlock(lock); 471 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, 472 ref->rc_sequenceid, HZ >> 1) < 0; 473 spin_lock(lock); 474 if (status) 475 goto out; 476 } 477 } 478 479out: 480 return status; 481} 482 483__be32 nfs4_callback_sequence(void *argp, void *resp, 484 struct cb_process_state *cps) 485{ 486 struct cb_sequenceargs *args = argp; 487 struct cb_sequenceres *res = resp; 488 struct nfs4_slot_table *tbl; 489 struct nfs4_slot *slot; 490 struct nfs_client *clp; 491 int i; 492 __be32 status = htonl(NFS4ERR_BADSESSION); 493 494 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, 495 &args->csa_sessionid, cps->minorversion); 496 if (clp == NULL) 497 goto out; 498 499 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 500 goto out; 501 502 tbl = &clp->cl_session->bc_slot_table; 503 504 /* Set up res before grabbing the spinlock */ 505 memcpy(&res->csr_sessionid, &args->csa_sessionid, 506 sizeof(res->csr_sessionid)); 507 res->csr_sequenceid = args->csa_sequenceid; 508 res->csr_slotid = args->csa_slotid; 509 510 spin_lock(&tbl->slot_tbl_lock); 511 /* state manager is resetting the session */ 512 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { 513 status = htonl(NFS4ERR_DELAY); 514 /* Return NFS4ERR_BADSESSION if we're draining the session 515 * in order to reset it. 516 */ 517 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) 518 status = htonl(NFS4ERR_BADSESSION); 519 goto out_unlock; 520 } 521 522 status = htonl(NFS4ERR_BADSLOT); 523 slot = nfs4_lookup_slot(tbl, args->csa_slotid); 524 if (IS_ERR(slot)) 525 goto out_unlock; 526 527 res->csr_highestslotid = tbl->server_highest_slotid; 528 res->csr_target_highestslotid = tbl->target_highest_slotid; 529 530 status = validate_seqid(tbl, slot, args); 531 if (status) 532 goto out_unlock; 533 if (!nfs4_try_to_lock_slot(tbl, slot)) { 534 status = htonl(NFS4ERR_DELAY); 535 goto out_unlock; 536 } 537 cps->slot = slot; 538 539 /* The ca_maxresponsesize_cached is 0 with no DRC */ 540 if (args->csa_cachethis != 0) { 541 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); 542 goto out_unlock; 543 } 544 545 /* 546 * Check for pending referring calls. If a match is found, a 547 * related callback was received before the response to the original 548 * call. 549 */ 550 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists, 551 &tbl->slot_tbl_lock) < 0) { 552 status = htonl(NFS4ERR_DELAY); 553 goto out_unlock; 554 } 555 556 /* 557 * RFC5661 20.9.3 558 * If CB_SEQUENCE returns an error, then the state of the slot 559 * (sequence ID, cached reply) MUST NOT change. 560 */ 561 slot->seq_nr = args->csa_sequenceid; 562out_unlock: 563 spin_unlock(&tbl->slot_tbl_lock); 564 565out: 566 cps->clp = clp; /* put in nfs4_callback_compound */ 567 for (i = 0; i < args->csa_nrclists; i++) 568 kfree(args->csa_rclists[i].rcl_refcalls); 569 kfree(args->csa_rclists); 570 571 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 572 cps->drc_status = status; 573 status = 0; 574 } else 575 res->csr_status = status; 576 577 trace_nfs4_cb_sequence(args, res, status); 578 return status; 579} 580 581static bool 582validate_bitmap_values(unsigned int mask) 583{ 584 return (mask & ~RCA4_TYPE_MASK_ALL) == 0; 585} 586 587__be32 nfs4_callback_recallany(void *argp, void *resp, 588 struct cb_process_state *cps) 589{ 590 struct cb_recallanyargs *args = argp; 591 __be32 status; 592 fmode_t flags = 0; 593 bool schedule_manager = false; 594 595 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 596 if (!cps->clp) /* set in cb_sequence */ 597 goto out; 598 599 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n", 600 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 601 602 status = cpu_to_be32(NFS4ERR_INVAL); 603 if (!validate_bitmap_values(args->craa_type_mask)) 604 goto out; 605 606 status = cpu_to_be32(NFS4_OK); 607 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG)) 608 flags = FMODE_READ; 609 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG)) 610 flags |= FMODE_WRITE; 611 if (flags) 612 nfs_expire_unused_delegation_types(cps->clp, flags); 613 614 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT)) 615 pnfs_recall_all_layouts(cps->clp); 616 617 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) { 618 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state); 619 schedule_manager = true; 620 } 621 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) { 622 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state); 623 schedule_manager = true; 624 } 625 if (schedule_manager) 626 nfs4_schedule_state_manager(cps->clp); 627 628out: 629 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 630 return status; 631} 632 633/* Reduce the fore channel's max_slots to the target value */ 634__be32 nfs4_callback_recallslot(void *argp, void *resp, 635 struct cb_process_state *cps) 636{ 637 struct cb_recallslotargs *args = argp; 638 struct nfs4_slot_table *fc_tbl; 639 __be32 status; 640 641 status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 642 if (!cps->clp) /* set in cb_sequence */ 643 goto out; 644 645 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n", 646 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), 647 args->crsa_target_highest_slotid); 648 649 fc_tbl = &cps->clp->cl_session->fc_slot_table; 650 651 status = htonl(NFS4_OK); 652 653 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid); 654 nfs41_notify_server(cps->clp); 655out: 656 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 657 return status; 658} 659 660__be32 nfs4_callback_notify_lock(void *argp, void *resp, 661 struct cb_process_state *cps) 662{ 663 struct cb_notify_lock_args *args = argp; 664 665 if (!cps->clp) /* set in cb_sequence */ 666 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 667 668 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", 669 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 670 671 /* Don't wake anybody if the string looked bogus */ 672 if (args->cbnl_valid) 673 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); 674 675 return htonl(NFS4_OK); 676} 677#endif /* CONFIG_NFS_V4_1 */ 678#ifdef CONFIG_NFS_V4_2 679static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state, 680 struct cb_offloadargs *args) 681{ 682 cp_state->count = args->wr_count; 683 cp_state->error = args->error; 684 if (!args->error) { 685 cp_state->verf.committed = args->wr_writeverf.committed; 686 memcpy(&cp_state->verf.verifier.data[0], 687 &args->wr_writeverf.verifier.data[0], 688 NFS4_VERIFIER_SIZE); 689 } 690} 691 692__be32 nfs4_callback_offload(void *data, void *dummy, 693 struct cb_process_state *cps) 694{ 695 struct cb_offloadargs *args = data; 696 struct nfs_server *server; 697 struct nfs4_copy_state *copy, *tmp_copy; 698 bool found = false; 699 700 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS); 701 if (!copy) 702 return htonl(NFS4ERR_SERVERFAULT); 703 704 spin_lock(&cps->clp->cl_lock); 705 rcu_read_lock(); 706 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks, 707 client_link) { 708 list_for_each_entry(tmp_copy, &server->ss_copies, copies) { 709 if (memcmp(args->coa_stateid.other, 710 tmp_copy->stateid.other, 711 sizeof(args->coa_stateid.other))) 712 continue; 713 nfs4_copy_cb_args(tmp_copy, args); 714 complete(&tmp_copy->completion); 715 found = true; 716 goto out; 717 } 718 } 719out: 720 rcu_read_unlock(); 721 if (!found) { 722 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE); 723 nfs4_copy_cb_args(copy, args); 724 list_add_tail(©->copies, &cps->clp->pending_cb_stateids); 725 } else 726 kfree(copy); 727 spin_unlock(&cps->clp->cl_lock); 728 729 return 0; 730} 731#endif /* CONFIG_NFS_V4_2 */ 732