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 memset(res->bitmap, 0, sizeof(res->bitmap)); 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->atime = inode_get_atime(inode); 63 res->ctime = inode_get_ctime(inode); 64 res->mtime = inode_get_mtime(inode); 65 res->bitmap[0] = (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE) & 66 args->bitmap[0]; 67 res->bitmap[1] = (FATTR4_WORD1_TIME_ACCESS | 68 FATTR4_WORD1_TIME_METADATA | 69 FATTR4_WORD1_TIME_MODIFY) & args->bitmap[1]; 70 res->bitmap[2] = (FATTR4_WORD2_TIME_DELEG_ACCESS | 71 FATTR4_WORD2_TIME_DELEG_MODIFY) & args->bitmap[2]; 72 res->status = 0; 73 out_iput: 74 rcu_read_unlock(); 75 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status)); 76 nfs_iput_and_deactive(inode); 77 out: 78 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status)); 79 return res->status; 80 } 81 82 __be32 nfs4_callback_recall(void *argp, void *resp, 83 struct cb_process_state *cps) 84 { 85 struct cb_recallargs *args = argp; 86 struct inode *inode; 87 __be32 res; 88 89 res = htonl(NFS4ERR_OP_NOT_IN_SESSION); 90 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */ 91 goto out; 92 93 dprintk_rcu("NFS: RECALL callback request from %s\n", 94 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 95 96 res = htonl(NFS4ERR_BADHANDLE); 97 inode = nfs_delegation_find_inode(cps->clp, &args->fh); 98 if (IS_ERR(inode)) { 99 if (inode == ERR_PTR(-EAGAIN)) 100 res = htonl(NFS4ERR_DELAY); 101 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL, 102 &args->stateid, -ntohl(res)); 103 goto out; 104 } 105 /* Set up a helper thread to actually return the delegation */ 106 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) { 107 case 0: 108 res = 0; 109 break; 110 case -ENOENT: 111 res = htonl(NFS4ERR_BAD_STATEID); 112 break; 113 default: 114 res = htonl(NFS4ERR_RESOURCE); 115 } 116 trace_nfs4_cb_recall(cps->clp, &args->fh, inode, 117 &args->stateid, -ntohl(res)); 118 nfs_iput_and_deactive(inode); 119 out: 120 dprintk("%s: exit with status = %d\n", __func__, ntohl(res)); 121 return res; 122 } 123 124 #if defined(CONFIG_NFS_V4_1) 125 126 /* 127 * Lookup a layout inode by stateid 128 * 129 * Note: returns a refcount on the inode and superblock 130 */ 131 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp, 132 const nfs4_stateid *stateid) 133 __must_hold(RCU) 134 { 135 struct nfs_server *server; 136 struct inode *inode; 137 struct pnfs_layout_hdr *lo; 138 139 rcu_read_lock(); 140 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 141 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 142 if (!pnfs_layout_is_valid(lo)) 143 continue; 144 if (!nfs4_stateid_match_other(stateid, &lo->plh_stateid)) 145 continue; 146 if (nfs_sb_active(server->super)) 147 inode = igrab(lo->plh_inode); 148 else 149 inode = ERR_PTR(-EAGAIN); 150 rcu_read_unlock(); 151 if (inode) 152 return inode; 153 nfs_sb_deactive(server->super); 154 return ERR_PTR(-EAGAIN); 155 } 156 } 157 rcu_read_unlock(); 158 return ERR_PTR(-ENOENT); 159 } 160 161 /* 162 * Lookup a layout inode by filehandle. 163 * 164 * Note: returns a refcount on the inode and superblock 165 * 166 */ 167 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp, 168 const struct nfs_fh *fh) 169 { 170 struct nfs_server *server; 171 struct nfs_inode *nfsi; 172 struct inode *inode; 173 struct pnfs_layout_hdr *lo; 174 175 rcu_read_lock(); 176 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 177 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 178 nfsi = NFS_I(lo->plh_inode); 179 if (nfs_compare_fh(fh, &nfsi->fh)) 180 continue; 181 if (nfsi->layout != lo) 182 continue; 183 if (nfs_sb_active(server->super)) 184 inode = igrab(lo->plh_inode); 185 else 186 inode = ERR_PTR(-EAGAIN); 187 rcu_read_unlock(); 188 if (inode) 189 return inode; 190 nfs_sb_deactive(server->super); 191 return ERR_PTR(-EAGAIN); 192 } 193 } 194 rcu_read_unlock(); 195 return ERR_PTR(-ENOENT); 196 } 197 198 static struct inode *nfs_layout_find_inode(struct nfs_client *clp, 199 const struct nfs_fh *fh, 200 const nfs4_stateid *stateid) 201 { 202 struct inode *inode; 203 204 inode = nfs_layout_find_inode_by_stateid(clp, stateid); 205 if (inode == ERR_PTR(-ENOENT)) 206 inode = nfs_layout_find_inode_by_fh(clp, fh); 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 struct cb_process_state *cps) 216 { 217 u32 oldseq, newseq; 218 219 /* Is the stateid not initialised? */ 220 if (!pnfs_layout_is_valid(lo)) 221 return NFS4ERR_NOMATCHING_LAYOUT; 222 223 /* Mismatched stateid? */ 224 if (!nfs4_stateid_match_other(&lo->plh_stateid, new)) 225 return NFS4ERR_BAD_STATEID; 226 227 newseq = be32_to_cpu(new->seqid); 228 /* Are we already in a layout recall situation? */ 229 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) 230 return NFS4ERR_DELAY; 231 232 /* 233 * Check that the stateid matches what we think it should be. 234 * Note that if the server sent us a list of referring calls, 235 * and we know that those have completed, then we trust the 236 * stateid argument is correct. 237 */ 238 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 239 if (newseq > oldseq + 1 && !cps->referring_calls) 240 return NFS4ERR_DELAY; 241 242 /* Crazy server! */ 243 if (newseq <= oldseq) 244 return NFS4ERR_OLD_STATEID; 245 246 return NFS_OK; 247 } 248 249 static u32 initiate_file_draining(struct nfs_client *clp, 250 struct cb_layoutrecallargs *args, 251 struct cb_process_state *cps) 252 { 253 struct inode *ino; 254 struct pnfs_layout_hdr *lo; 255 u32 rv = NFS4ERR_NOMATCHING_LAYOUT; 256 LIST_HEAD(free_me_list); 257 258 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid); 259 if (IS_ERR(ino)) { 260 if (ino == ERR_PTR(-EAGAIN)) 261 rv = NFS4ERR_DELAY; 262 goto out_noput; 263 } 264 265 pnfs_layoutcommit_inode(ino, false); 266 267 268 spin_lock(&ino->i_lock); 269 lo = NFS_I(ino)->layout; 270 if (!lo) { 271 spin_unlock(&ino->i_lock); 272 goto out; 273 } 274 pnfs_get_layout_hdr(lo); 275 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid, cps); 276 if (rv != NFS_OK) 277 goto unlock; 278 279 /* 280 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return) 281 */ 282 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 283 rv = NFS4ERR_DELAY; 284 goto unlock; 285 } 286 287 pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true); 288 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list, 289 &args->cbl_range, 290 be32_to_cpu(args->cbl_stateid.seqid))) { 291 case 0: 292 case -EBUSY: 293 /* There are layout segments that need to be returned */ 294 rv = NFS4_OK; 295 break; 296 case -ENOENT: 297 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags); 298 /* Embrace your forgetfulness! */ 299 rv = NFS4ERR_NOMATCHING_LAYOUT; 300 301 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 302 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, 303 &args->cbl_range); 304 } 305 } 306 unlock: 307 spin_unlock(&ino->i_lock); 308 pnfs_free_lseg_list(&free_me_list); 309 /* Free all lsegs that are attached to commit buckets */ 310 nfs_commit_inode(ino, 0); 311 pnfs_put_layout_hdr(lo); 312 out: 313 nfs_iput_and_deactive(ino); 314 out_noput: 315 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino, 316 &args->cbl_stateid, -rv); 317 return rv; 318 } 319 320 static u32 initiate_bulk_draining(struct nfs_client *clp, 321 struct cb_layoutrecallargs *args) 322 { 323 int stat; 324 325 if (args->cbl_recall_type == RETURN_FSID) 326 stat = pnfs_layout_destroy_byfsid(clp, &args->cbl_fsid, 327 PNFS_LAYOUT_BULK_RETURN); 328 else 329 stat = pnfs_layout_destroy_byclid(clp, PNFS_LAYOUT_BULK_RETURN); 330 if (stat != 0) 331 return NFS4ERR_DELAY; 332 return NFS4ERR_NOMATCHING_LAYOUT; 333 } 334 335 static u32 do_callback_layoutrecall(struct nfs_client *clp, 336 struct cb_layoutrecallargs *args, 337 struct cb_process_state *cps) 338 { 339 if (args->cbl_recall_type == RETURN_FILE) 340 return initiate_file_draining(clp, args, cps); 341 return initiate_bulk_draining(clp, args); 342 } 343 344 __be32 nfs4_callback_layoutrecall(void *argp, void *resp, 345 struct cb_process_state *cps) 346 { 347 struct cb_layoutrecallargs *args = argp; 348 u32 res = NFS4ERR_OP_NOT_IN_SESSION; 349 350 if (cps->clp) 351 res = do_callback_layoutrecall(cps->clp, args, cps); 352 return cpu_to_be32(res); 353 } 354 355 static void pnfs_recall_all_layouts(struct nfs_client *clp, 356 struct cb_process_state *cps) 357 { 358 struct cb_layoutrecallargs args; 359 360 /* Pretend we got a CB_LAYOUTRECALL(ALL) */ 361 memset(&args, 0, sizeof(args)); 362 args.cbl_recall_type = RETURN_ALL; 363 /* FIXME we ignore errors, what should we do? */ 364 do_callback_layoutrecall(clp, &args, cps); 365 } 366 367 __be32 nfs4_callback_devicenotify(void *argp, void *resp, 368 struct cb_process_state *cps) 369 { 370 struct cb_devicenotifyargs *args = argp; 371 const struct pnfs_layoutdriver_type *ld = NULL; 372 uint32_t i; 373 __be32 res = 0; 374 375 if (!cps->clp) { 376 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 377 goto out; 378 } 379 380 for (i = 0; i < args->ndevs; i++) { 381 struct cb_devicenotifyitem *dev = &args->devs[i]; 382 383 if (!ld || ld->id != dev->cbd_layout_type) { 384 pnfs_put_layoutdriver(ld); 385 ld = pnfs_find_layoutdriver(dev->cbd_layout_type); 386 if (!ld) 387 continue; 388 } 389 nfs4_delete_deviceid(ld, cps->clp, &dev->cbd_dev_id); 390 } 391 pnfs_put_layoutdriver(ld); 392 out: 393 kfree(args->devs); 394 return res; 395 } 396 397 /* 398 * Validate the sequenceID sent by the server. 399 * Return success if the sequenceID is one more than what we last saw on 400 * this slot, accounting for wraparound. Increments the slot's sequence. 401 * 402 * We don't yet implement a duplicate request cache, instead we set the 403 * back channel ca_maxresponsesize_cached to zero. This is OK for now 404 * since we only currently implement idempotent callbacks anyway. 405 * 406 * We have a single slot backchannel at this time, so we don't bother 407 * checking the used_slots bit array on the table. The lower layer guarantees 408 * a single outstanding callback request at a time. 409 */ 410 static __be32 411 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot, 412 const struct cb_sequenceargs * args) 413 { 414 __be32 ret; 415 416 ret = cpu_to_be32(NFS4ERR_BADSLOT); 417 if (args->csa_slotid > tbl->server_highest_slotid) 418 goto out_err; 419 420 /* Replay */ 421 if (args->csa_sequenceid == slot->seq_nr) { 422 ret = cpu_to_be32(NFS4ERR_DELAY); 423 if (nfs4_test_locked_slot(tbl, slot->slot_nr)) 424 goto out_err; 425 426 /* Signal process_op to set this error on next op */ 427 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP); 428 if (args->csa_cachethis == 0) 429 goto out_err; 430 431 /* Liar! We never allowed you to set csa_cachethis != 0 */ 432 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY); 433 goto out_err; 434 } 435 436 /* Note: wraparound relies on seq_nr being of type u32 */ 437 /* Misordered request */ 438 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED); 439 if (args->csa_sequenceid != slot->seq_nr + 1) 440 goto out_err; 441 442 return cpu_to_be32(NFS4_OK); 443 444 out_err: 445 trace_nfs4_cb_seqid_err(args, ret); 446 return ret; 447 } 448 449 /* 450 * For each referring call triple, check the session's slot table for 451 * a match. If the slot is in use and the sequence numbers match, the 452 * client is still waiting for a response to the original request. 453 */ 454 static int referring_call_exists(struct nfs_client *clp, 455 uint32_t nrclists, 456 struct referring_call_list *rclists, 457 spinlock_t *lock) 458 __releases(lock) 459 __acquires(lock) 460 { 461 int status = 0; 462 int found = 0; 463 int i, j; 464 struct nfs4_session *session; 465 struct nfs4_slot_table *tbl; 466 struct referring_call_list *rclist; 467 struct referring_call *ref; 468 469 /* 470 * XXX When client trunking is implemented, this becomes 471 * a session lookup from within the loop 472 */ 473 session = clp->cl_session; 474 tbl = &session->fc_slot_table; 475 476 for (i = 0; i < nrclists; i++) { 477 rclist = &rclists[i]; 478 if (memcmp(session->sess_id.data, 479 rclist->rcl_sessionid.data, 480 NFS4_MAX_SESSIONID_LEN) != 0) 481 continue; 482 483 for (j = 0; j < rclist->rcl_nrefcalls; j++) { 484 ref = &rclist->rcl_refcalls[j]; 485 spin_unlock(lock); 486 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid, 487 ref->rc_sequenceid, HZ >> 1) < 0; 488 spin_lock(lock); 489 if (status) 490 goto out; 491 found++; 492 } 493 } 494 495 out: 496 return status < 0 ? status : found; 497 } 498 499 __be32 nfs4_callback_sequence(void *argp, void *resp, 500 struct cb_process_state *cps) 501 { 502 struct cb_sequenceargs *args = argp; 503 struct cb_sequenceres *res = resp; 504 struct nfs4_slot_table *tbl; 505 struct nfs4_slot *slot; 506 struct nfs_client *clp; 507 int ret; 508 int i; 509 __be32 status = htonl(NFS4ERR_BADSESSION); 510 511 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr, 512 &args->csa_sessionid, cps->minorversion); 513 if (clp == NULL) 514 goto out; 515 516 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 517 goto out; 518 519 tbl = &clp->cl_session->bc_slot_table; 520 521 /* Set up res before grabbing the spinlock */ 522 memcpy(&res->csr_sessionid, &args->csa_sessionid, 523 sizeof(res->csr_sessionid)); 524 res->csr_sequenceid = args->csa_sequenceid; 525 res->csr_slotid = args->csa_slotid; 526 527 spin_lock(&tbl->slot_tbl_lock); 528 /* state manager is resetting the session */ 529 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { 530 status = htonl(NFS4ERR_DELAY); 531 /* Return NFS4ERR_BADSESSION if we're draining the session 532 * in order to reset it. 533 */ 534 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) 535 status = htonl(NFS4ERR_BADSESSION); 536 goto out_unlock; 537 } 538 539 status = htonl(NFS4ERR_BADSLOT); 540 slot = nfs4_lookup_slot(tbl, args->csa_slotid); 541 if (IS_ERR(slot)) 542 goto out_unlock; 543 544 res->csr_highestslotid = tbl->server_highest_slotid; 545 res->csr_target_highestslotid = tbl->target_highest_slotid; 546 547 status = validate_seqid(tbl, slot, args); 548 if (status) 549 goto out_unlock; 550 if (!nfs4_try_to_lock_slot(tbl, slot)) { 551 status = htonl(NFS4ERR_DELAY); 552 goto out_unlock; 553 } 554 cps->slot = slot; 555 556 /* The ca_maxresponsesize_cached is 0 with no DRC */ 557 if (args->csa_cachethis != 0) { 558 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE); 559 goto out_unlock; 560 } 561 562 /* 563 * Check for pending referring calls. If a match is found, a 564 * related callback was received before the response to the original 565 * call. 566 */ 567 ret = referring_call_exists(clp, args->csa_nrclists, args->csa_rclists, 568 &tbl->slot_tbl_lock); 569 if (ret < 0) { 570 status = htonl(NFS4ERR_DELAY); 571 goto out_unlock; 572 } 573 cps->referring_calls = ret; 574 575 /* 576 * RFC5661 20.9.3 577 * If CB_SEQUENCE returns an error, then the state of the slot 578 * (sequence ID, cached reply) MUST NOT change. 579 */ 580 slot->seq_nr = args->csa_sequenceid; 581 out_unlock: 582 spin_unlock(&tbl->slot_tbl_lock); 583 584 out: 585 cps->clp = clp; /* put in nfs4_callback_compound */ 586 for (i = 0; i < args->csa_nrclists; i++) 587 kfree(args->csa_rclists[i].rcl_refcalls); 588 kfree(args->csa_rclists); 589 590 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) { 591 cps->drc_status = status; 592 status = 0; 593 } else 594 res->csr_status = status; 595 596 trace_nfs4_cb_sequence(args, res, status); 597 return status; 598 } 599 600 static bool 601 validate_bitmap_values(unsigned int mask) 602 { 603 return (mask & ~RCA4_TYPE_MASK_ALL) == 0; 604 } 605 606 __be32 nfs4_callback_recallany(void *argp, void *resp, 607 struct cb_process_state *cps) 608 { 609 struct cb_recallanyargs *args = argp; 610 __be32 status; 611 fmode_t flags = 0; 612 bool schedule_manager = false; 613 614 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION); 615 if (!cps->clp) /* set in cb_sequence */ 616 goto out; 617 618 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n", 619 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 620 621 status = cpu_to_be32(NFS4ERR_INVAL); 622 if (!validate_bitmap_values(args->craa_type_mask)) 623 goto out; 624 625 status = cpu_to_be32(NFS4_OK); 626 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG)) 627 flags = FMODE_READ; 628 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG)) 629 flags |= FMODE_WRITE; 630 if (flags) 631 nfs_expire_unused_delegation_types(cps->clp, flags); 632 633 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT)) 634 pnfs_recall_all_layouts(cps->clp, cps); 635 636 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) { 637 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state); 638 schedule_manager = true; 639 } 640 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) { 641 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state); 642 schedule_manager = true; 643 } 644 if (schedule_manager) 645 nfs4_schedule_state_manager(cps->clp); 646 647 out: 648 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 649 return status; 650 } 651 652 /* Reduce the fore channel's max_slots to the target value */ 653 __be32 nfs4_callback_recallslot(void *argp, void *resp, 654 struct cb_process_state *cps) 655 { 656 struct cb_recallslotargs *args = argp; 657 struct nfs4_slot_table *fc_tbl; 658 __be32 status; 659 660 status = htonl(NFS4ERR_OP_NOT_IN_SESSION); 661 if (!cps->clp) /* set in cb_sequence */ 662 goto out; 663 664 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n", 665 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR), 666 args->crsa_target_highest_slotid); 667 668 fc_tbl = &cps->clp->cl_session->fc_slot_table; 669 670 status = htonl(NFS4_OK); 671 672 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid); 673 nfs41_notify_server(cps->clp); 674 out: 675 dprintk("%s: exit with status = %d\n", __func__, ntohl(status)); 676 return status; 677 } 678 679 __be32 nfs4_callback_notify_lock(void *argp, void *resp, 680 struct cb_process_state *cps) 681 { 682 struct cb_notify_lock_args *args = argp; 683 684 if (!cps->clp) /* set in cb_sequence */ 685 return htonl(NFS4ERR_OP_NOT_IN_SESSION); 686 687 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", 688 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); 689 690 /* Don't wake anybody if the string looked bogus */ 691 if (args->cbnl_valid) 692 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); 693 694 return htonl(NFS4_OK); 695 } 696 #endif /* CONFIG_NFS_V4_1 */ 697 #ifdef CONFIG_NFS_V4_2 698 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state, 699 struct cb_offloadargs *args) 700 { 701 cp_state->count = args->wr_count; 702 cp_state->error = args->error; 703 if (!args->error) { 704 cp_state->verf.committed = args->wr_writeverf.committed; 705 memcpy(&cp_state->verf.verifier.data[0], 706 &args->wr_writeverf.verifier.data[0], 707 NFS4_VERIFIER_SIZE); 708 } 709 } 710 711 __be32 nfs4_callback_offload(void *data, void *dummy, 712 struct cb_process_state *cps) 713 { 714 struct cb_offloadargs *args = data; 715 struct nfs_server *server; 716 struct nfs4_copy_state *copy, *tmp_copy; 717 bool found = false; 718 719 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_KERNEL); 720 if (!copy) 721 return cpu_to_be32(NFS4ERR_DELAY); 722 723 spin_lock(&cps->clp->cl_lock); 724 rcu_read_lock(); 725 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks, 726 client_link) { 727 list_for_each_entry(tmp_copy, &server->ss_copies, copies) { 728 if (memcmp(args->coa_stateid.other, 729 tmp_copy->stateid.other, 730 sizeof(args->coa_stateid.other))) 731 continue; 732 nfs4_copy_cb_args(tmp_copy, args); 733 complete(&tmp_copy->completion); 734 found = true; 735 goto out; 736 } 737 } 738 out: 739 rcu_read_unlock(); 740 if (!found) { 741 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE); 742 nfs4_copy_cb_args(copy, args); 743 list_add_tail(©->copies, &cps->clp->pending_cb_stateids); 744 } else 745 kfree(copy); 746 spin_unlock(&cps->clp->cl_lock); 747 748 trace_nfs4_cb_offload(&args->coa_fh, &args->coa_stateid, 749 args->wr_count, args->error, 750 args->wr_writeverf.committed); 751 return 0; 752 } 753 #endif /* CONFIG_NFS_V4_2 */ 754