1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Common NFS I/O operations for the pnfs file based 4 * layout drivers. 5 * 6 * Copyright (c) 2014, Primary Data, Inc. All rights reserved. 7 * 8 * Tom Haynes <loghyr@primarydata.com> 9 */ 10 11 #include <linux/nfs_fs.h> 12 #include <linux/nfs_page.h> 13 #include <linux/sunrpc/addr.h> 14 #include <linux/module.h> 15 16 #include "nfs4session.h" 17 #include "internal.h" 18 #include "pnfs.h" 19 20 #define NFSDBG_FACILITY NFSDBG_PNFS 21 22 void pnfs_generic_rw_release(void *data) 23 { 24 struct nfs_pgio_header *hdr = data; 25 26 nfs_put_client(hdr->ds_clp); 27 hdr->mds_ops->rpc_release(data); 28 } 29 EXPORT_SYMBOL_GPL(pnfs_generic_rw_release); 30 31 /* Fake up some data that will cause nfs_commit_release to retry the writes. */ 32 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data) 33 { 34 struct nfs_writeverf *verf = data->res.verf; 35 36 data->task.tk_status = 0; 37 memset(&verf->verifier, 0, sizeof(verf->verifier)); 38 verf->committed = NFS_UNSTABLE; 39 } 40 EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes); 41 42 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data) 43 { 44 struct nfs_commit_data *wdata = data; 45 46 /* Note this may cause RPC to be resent */ 47 wdata->mds_ops->rpc_call_done(task, data); 48 } 49 EXPORT_SYMBOL_GPL(pnfs_generic_write_commit_done); 50 51 void pnfs_generic_commit_release(void *calldata) 52 { 53 struct nfs_commit_data *data = calldata; 54 55 data->completion_ops->completion(data); 56 pnfs_put_lseg(data->lseg); 57 nfs_put_client(data->ds_clp); 58 nfs_commitdata_release(data); 59 } 60 EXPORT_SYMBOL_GPL(pnfs_generic_commit_release); 61 62 /* The generic layer is about to remove the req from the commit list. 63 * If this will make the bucket empty, it will need to put the lseg reference. 64 * Note this must be called holding nfsi->commit_mutex 65 */ 66 void 67 pnfs_generic_clear_request_commit(struct nfs_page *req, 68 struct nfs_commit_info *cinfo) 69 { 70 struct pnfs_layout_segment *freeme = NULL; 71 72 if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags)) 73 goto out; 74 cinfo->ds->nwritten--; 75 if (list_is_singular(&req->wb_list)) { 76 struct pnfs_commit_bucket *bucket; 77 78 bucket = list_first_entry(&req->wb_list, 79 struct pnfs_commit_bucket, 80 written); 81 freeme = bucket->wlseg; 82 bucket->wlseg = NULL; 83 } 84 out: 85 nfs_request_remove_commit_list(req, cinfo); 86 pnfs_put_lseg(freeme); 87 } 88 EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit); 89 90 static int 91 pnfs_generic_scan_ds_commit_list(struct pnfs_commit_bucket *bucket, 92 struct nfs_commit_info *cinfo, 93 int max) 94 { 95 struct list_head *src = &bucket->written; 96 struct list_head *dst = &bucket->committing; 97 int ret; 98 99 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); 100 ret = nfs_scan_commit_list(src, dst, cinfo, max); 101 if (ret) { 102 cinfo->ds->nwritten -= ret; 103 cinfo->ds->ncommitting += ret; 104 if (bucket->clseg == NULL) 105 bucket->clseg = pnfs_get_lseg(bucket->wlseg); 106 if (list_empty(src)) { 107 pnfs_put_lseg(bucket->wlseg); 108 bucket->wlseg = NULL; 109 } 110 } 111 return ret; 112 } 113 114 /* Move reqs from written to committing lists, returning count 115 * of number moved. 116 */ 117 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, 118 int max) 119 { 120 int i, rv = 0, cnt; 121 122 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); 123 for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) { 124 cnt = pnfs_generic_scan_ds_commit_list(&cinfo->ds->buckets[i], 125 cinfo, max); 126 max -= cnt; 127 rv += cnt; 128 } 129 return rv; 130 } 131 EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists); 132 133 /* Pull everything off the committing lists and dump into @dst. */ 134 void pnfs_generic_recover_commit_reqs(struct list_head *dst, 135 struct nfs_commit_info *cinfo) 136 { 137 struct pnfs_commit_bucket *b; 138 struct pnfs_layout_segment *freeme; 139 int nwritten; 140 int i; 141 142 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); 143 restart: 144 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { 145 nwritten = nfs_scan_commit_list(&b->written, dst, cinfo, 0); 146 if (!nwritten) 147 continue; 148 cinfo->ds->nwritten -= nwritten; 149 if (list_empty(&b->written)) { 150 freeme = b->wlseg; 151 b->wlseg = NULL; 152 pnfs_put_lseg(freeme); 153 goto restart; 154 } 155 } 156 } 157 EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs); 158 159 static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx) 160 { 161 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 162 struct pnfs_commit_bucket *bucket; 163 struct pnfs_layout_segment *freeme; 164 struct list_head *pos; 165 LIST_HEAD(pages); 166 int i; 167 168 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 169 for (i = idx; i < fl_cinfo->nbuckets; i++) { 170 bucket = &fl_cinfo->buckets[i]; 171 if (list_empty(&bucket->committing)) 172 continue; 173 freeme = bucket->clseg; 174 bucket->clseg = NULL; 175 list_for_each(pos, &bucket->committing) 176 cinfo->ds->ncommitting--; 177 list_splice_init(&bucket->committing, &pages); 178 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 179 nfs_retry_commit(&pages, freeme, cinfo, i); 180 pnfs_put_lseg(freeme); 181 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 182 } 183 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 184 } 185 186 static unsigned int 187 pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo, 188 struct list_head *list) 189 { 190 struct pnfs_ds_commit_info *fl_cinfo; 191 struct pnfs_commit_bucket *bucket; 192 struct nfs_commit_data *data; 193 int i; 194 unsigned int nreq = 0; 195 196 fl_cinfo = cinfo->ds; 197 bucket = fl_cinfo->buckets; 198 for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) { 199 if (list_empty(&bucket->committing)) 200 continue; 201 data = nfs_commitdata_alloc(false); 202 if (!data) 203 break; 204 data->ds_commit_index = i; 205 list_add(&data->pages, list); 206 nreq++; 207 } 208 209 /* Clean up on error */ 210 pnfs_generic_retry_commit(cinfo, i); 211 return nreq; 212 } 213 214 static inline 215 void pnfs_fetch_commit_bucket_list(struct list_head *pages, 216 struct nfs_commit_data *data, 217 struct nfs_commit_info *cinfo) 218 { 219 struct pnfs_commit_bucket *bucket; 220 struct list_head *pos; 221 222 bucket = &cinfo->ds->buckets[data->ds_commit_index]; 223 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 224 list_for_each(pos, &bucket->committing) 225 cinfo->ds->ncommitting--; 226 list_splice_init(&bucket->committing, pages); 227 data->lseg = bucket->clseg; 228 bucket->clseg = NULL; 229 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 230 231 } 232 233 /* Helper function for pnfs_generic_commit_pagelist to catch an empty 234 * page list. This can happen when two commits race. 235 * 236 * This must be called instead of nfs_init_commit - call one or the other, but 237 * not both! 238 */ 239 static bool 240 pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages, 241 struct nfs_commit_data *data, 242 struct nfs_commit_info *cinfo) 243 { 244 if (list_empty(pages)) { 245 if (atomic_dec_and_test(&cinfo->mds->rpcs_out)) 246 wake_up_var(&cinfo->mds->rpcs_out); 247 /* don't call nfs_commitdata_release - it tries to put 248 * the open_context which is not acquired until nfs_init_commit 249 * which has not been called on @data */ 250 WARN_ON_ONCE(data->context); 251 nfs_commit_free(data); 252 return true; 253 } 254 255 return false; 256 } 257 258 /* This follows nfs_commit_list pretty closely */ 259 int 260 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 261 int how, struct nfs_commit_info *cinfo, 262 int (*initiate_commit)(struct nfs_commit_data *data, 263 int how)) 264 { 265 struct nfs_commit_data *data, *tmp; 266 LIST_HEAD(list); 267 unsigned int nreq = 0; 268 269 if (!list_empty(mds_pages)) { 270 data = nfs_commitdata_alloc(true); 271 data->ds_commit_index = -1; 272 list_add(&data->pages, &list); 273 nreq++; 274 } 275 276 nreq += pnfs_generic_alloc_ds_commits(cinfo, &list); 277 278 if (nreq == 0) 279 goto out; 280 281 atomic_add(nreq, &cinfo->mds->rpcs_out); 282 283 list_for_each_entry_safe(data, tmp, &list, pages) { 284 list_del_init(&data->pages); 285 if (data->ds_commit_index < 0) { 286 /* another commit raced with us */ 287 if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages, 288 data, cinfo)) 289 continue; 290 291 nfs_init_commit(data, mds_pages, NULL, cinfo); 292 nfs_initiate_commit(NFS_CLIENT(inode), data, 293 NFS_PROTO(data->inode), 294 data->mds_ops, how, 0); 295 } else { 296 LIST_HEAD(pages); 297 298 pnfs_fetch_commit_bucket_list(&pages, data, cinfo); 299 300 /* another commit raced with us */ 301 if (pnfs_generic_commit_cancel_empty_pagelist(&pages, 302 data, cinfo)) 303 continue; 304 305 nfs_init_commit(data, &pages, data->lseg, cinfo); 306 initiate_commit(data, how); 307 } 308 } 309 out: 310 return PNFS_ATTEMPTED; 311 } 312 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); 313 314 /* 315 * Data server cache 316 * 317 * Data servers can be mapped to different device ids. 318 * nfs4_pnfs_ds reference counting 319 * - set to 1 on allocation 320 * - incremented when a device id maps a data server already in the cache. 321 * - decremented when deviceid is removed from the cache. 322 */ 323 static DEFINE_SPINLOCK(nfs4_ds_cache_lock); 324 static LIST_HEAD(nfs4_data_server_cache); 325 326 /* Debug routines */ 327 static void 328 print_ds(struct nfs4_pnfs_ds *ds) 329 { 330 if (ds == NULL) { 331 printk(KERN_WARNING "%s NULL device\n", __func__); 332 return; 333 } 334 printk(KERN_WARNING " ds %s\n" 335 " ref count %d\n" 336 " client %p\n" 337 " cl_exchange_flags %x\n", 338 ds->ds_remotestr, 339 refcount_read(&ds->ds_count), ds->ds_clp, 340 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); 341 } 342 343 static bool 344 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) 345 { 346 struct sockaddr_in *a, *b; 347 struct sockaddr_in6 *a6, *b6; 348 349 if (addr1->sa_family != addr2->sa_family) 350 return false; 351 352 switch (addr1->sa_family) { 353 case AF_INET: 354 a = (struct sockaddr_in *)addr1; 355 b = (struct sockaddr_in *)addr2; 356 357 if (a->sin_addr.s_addr == b->sin_addr.s_addr && 358 a->sin_port == b->sin_port) 359 return true; 360 break; 361 362 case AF_INET6: 363 a6 = (struct sockaddr_in6 *)addr1; 364 b6 = (struct sockaddr_in6 *)addr2; 365 366 /* LINKLOCAL addresses must have matching scope_id */ 367 if (ipv6_addr_src_scope(&a6->sin6_addr) == 368 IPV6_ADDR_SCOPE_LINKLOCAL && 369 a6->sin6_scope_id != b6->sin6_scope_id) 370 return false; 371 372 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && 373 a6->sin6_port == b6->sin6_port) 374 return true; 375 break; 376 377 default: 378 dprintk("%s: unhandled address family: %u\n", 379 __func__, addr1->sa_family); 380 return false; 381 } 382 383 return false; 384 } 385 386 /* 387 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, 388 * declare a match. 389 */ 390 static bool 391 _same_data_server_addrs_locked(const struct list_head *dsaddrs1, 392 const struct list_head *dsaddrs2) 393 { 394 struct nfs4_pnfs_ds_addr *da1, *da2; 395 struct sockaddr *sa1, *sa2; 396 bool match = false; 397 398 list_for_each_entry(da1, dsaddrs1, da_node) { 399 sa1 = (struct sockaddr *)&da1->da_addr; 400 match = false; 401 list_for_each_entry(da2, dsaddrs2, da_node) { 402 sa2 = (struct sockaddr *)&da2->da_addr; 403 match = same_sockaddr(sa1, sa2); 404 if (match) 405 break; 406 } 407 if (!match) 408 break; 409 } 410 return match; 411 } 412 413 /* 414 * Lookup DS by addresses. nfs4_ds_cache_lock is held 415 */ 416 static struct nfs4_pnfs_ds * 417 _data_server_lookup_locked(const struct list_head *dsaddrs) 418 { 419 struct nfs4_pnfs_ds *ds; 420 421 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) 422 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) 423 return ds; 424 return NULL; 425 } 426 427 static void destroy_ds(struct nfs4_pnfs_ds *ds) 428 { 429 struct nfs4_pnfs_ds_addr *da; 430 431 dprintk("--> %s\n", __func__); 432 ifdebug(FACILITY) 433 print_ds(ds); 434 435 nfs_put_client(ds->ds_clp); 436 437 while (!list_empty(&ds->ds_addrs)) { 438 da = list_first_entry(&ds->ds_addrs, 439 struct nfs4_pnfs_ds_addr, 440 da_node); 441 list_del_init(&da->da_node); 442 kfree(da->da_remotestr); 443 kfree(da); 444 } 445 446 kfree(ds->ds_remotestr); 447 kfree(ds); 448 } 449 450 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) 451 { 452 if (refcount_dec_and_lock(&ds->ds_count, 453 &nfs4_ds_cache_lock)) { 454 list_del_init(&ds->ds_node); 455 spin_unlock(&nfs4_ds_cache_lock); 456 destroy_ds(ds); 457 } 458 } 459 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); 460 461 /* 462 * Create a string with a human readable address and port to avoid 463 * complicated setup around many dprinks. 464 */ 465 static char * 466 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) 467 { 468 struct nfs4_pnfs_ds_addr *da; 469 char *remotestr; 470 size_t len; 471 char *p; 472 473 len = 3; /* '{', '}' and eol */ 474 list_for_each_entry(da, dsaddrs, da_node) { 475 len += strlen(da->da_remotestr) + 1; /* string plus comma */ 476 } 477 478 remotestr = kzalloc(len, gfp_flags); 479 if (!remotestr) 480 return NULL; 481 482 p = remotestr; 483 *(p++) = '{'; 484 len--; 485 list_for_each_entry(da, dsaddrs, da_node) { 486 size_t ll = strlen(da->da_remotestr); 487 488 if (ll > len) 489 goto out_err; 490 491 memcpy(p, da->da_remotestr, ll); 492 p += ll; 493 len -= ll; 494 495 if (len < 1) 496 goto out_err; 497 (*p++) = ','; 498 len--; 499 } 500 if (len < 2) 501 goto out_err; 502 *(p++) = '}'; 503 *p = '\0'; 504 return remotestr; 505 out_err: 506 kfree(remotestr); 507 return NULL; 508 } 509 510 /* 511 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if 512 * uncached and return cached struct nfs4_pnfs_ds. 513 */ 514 struct nfs4_pnfs_ds * 515 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) 516 { 517 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; 518 char *remotestr; 519 520 if (list_empty(dsaddrs)) { 521 dprintk("%s: no addresses defined\n", __func__); 522 goto out; 523 } 524 525 ds = kzalloc(sizeof(*ds), gfp_flags); 526 if (!ds) 527 goto out; 528 529 /* this is only used for debugging, so it's ok if its NULL */ 530 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); 531 532 spin_lock(&nfs4_ds_cache_lock); 533 tmp_ds = _data_server_lookup_locked(dsaddrs); 534 if (tmp_ds == NULL) { 535 INIT_LIST_HEAD(&ds->ds_addrs); 536 list_splice_init(dsaddrs, &ds->ds_addrs); 537 ds->ds_remotestr = remotestr; 538 refcount_set(&ds->ds_count, 1); 539 INIT_LIST_HEAD(&ds->ds_node); 540 ds->ds_clp = NULL; 541 list_add(&ds->ds_node, &nfs4_data_server_cache); 542 dprintk("%s add new data server %s\n", __func__, 543 ds->ds_remotestr); 544 } else { 545 kfree(remotestr); 546 kfree(ds); 547 refcount_inc(&tmp_ds->ds_count); 548 dprintk("%s data server %s found, inc'ed ds_count to %d\n", 549 __func__, tmp_ds->ds_remotestr, 550 refcount_read(&tmp_ds->ds_count)); 551 ds = tmp_ds; 552 } 553 spin_unlock(&nfs4_ds_cache_lock); 554 out: 555 return ds; 556 } 557 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); 558 559 static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) 560 { 561 might_sleep(); 562 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, 563 TASK_KILLABLE); 564 } 565 566 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) 567 { 568 smp_mb__before_atomic(); 569 clear_bit(NFS4DS_CONNECTING, &ds->ds_state); 570 smp_mb__after_atomic(); 571 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); 572 } 573 574 static struct nfs_client *(*get_v3_ds_connect)( 575 struct nfs_server *mds_srv, 576 const struct sockaddr *ds_addr, 577 int ds_addrlen, 578 int ds_proto, 579 unsigned int ds_timeo, 580 unsigned int ds_retrans); 581 582 static bool load_v3_ds_connect(void) 583 { 584 if (!get_v3_ds_connect) { 585 get_v3_ds_connect = symbol_request(nfs3_set_ds_client); 586 WARN_ON_ONCE(!get_v3_ds_connect); 587 } 588 589 return(get_v3_ds_connect != NULL); 590 } 591 592 void nfs4_pnfs_v3_ds_connect_unload(void) 593 { 594 if (get_v3_ds_connect) { 595 symbol_put(nfs3_set_ds_client); 596 get_v3_ds_connect = NULL; 597 } 598 } 599 600 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, 601 struct nfs4_pnfs_ds *ds, 602 unsigned int timeo, 603 unsigned int retrans) 604 { 605 struct nfs_client *clp = ERR_PTR(-EIO); 606 struct nfs4_pnfs_ds_addr *da; 607 int status = 0; 608 609 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); 610 611 if (!load_v3_ds_connect()) 612 goto out; 613 614 list_for_each_entry(da, &ds->ds_addrs, da_node) { 615 dprintk("%s: DS %s: trying address %s\n", 616 __func__, ds->ds_remotestr, da->da_remotestr); 617 618 if (!IS_ERR(clp)) { 619 struct xprt_create xprt_args = { 620 .ident = XPRT_TRANSPORT_TCP, 621 .net = clp->cl_net, 622 .dstaddr = (struct sockaddr *)&da->da_addr, 623 .addrlen = da->da_addrlen, 624 .servername = clp->cl_hostname, 625 }; 626 /* Add this address as an alias */ 627 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 628 rpc_clnt_test_and_add_xprt, NULL); 629 continue; 630 } 631 clp = get_v3_ds_connect(mds_srv, 632 (struct sockaddr *)&da->da_addr, 633 da->da_addrlen, IPPROTO_TCP, 634 timeo, retrans); 635 if (IS_ERR(clp)) 636 continue; 637 clp->cl_rpcclient->cl_softerr = 0; 638 clp->cl_rpcclient->cl_softrtry = 0; 639 } 640 641 if (IS_ERR(clp)) { 642 status = PTR_ERR(clp); 643 goto out; 644 } 645 646 smp_wmb(); 647 ds->ds_clp = clp; 648 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 649 out: 650 return status; 651 } 652 653 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, 654 struct nfs4_pnfs_ds *ds, 655 unsigned int timeo, 656 unsigned int retrans, 657 u32 minor_version) 658 { 659 struct nfs_client *clp = ERR_PTR(-EIO); 660 struct nfs4_pnfs_ds_addr *da; 661 int status = 0; 662 663 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); 664 665 list_for_each_entry(da, &ds->ds_addrs, da_node) { 666 dprintk("%s: DS %s: trying address %s\n", 667 __func__, ds->ds_remotestr, da->da_remotestr); 668 669 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { 670 struct xprt_create xprt_args = { 671 .ident = XPRT_TRANSPORT_TCP, 672 .net = clp->cl_net, 673 .dstaddr = (struct sockaddr *)&da->da_addr, 674 .addrlen = da->da_addrlen, 675 .servername = clp->cl_hostname, 676 }; 677 struct nfs4_add_xprt_data xprtdata = { 678 .clp = clp, 679 .cred = nfs4_get_clid_cred(clp), 680 }; 681 struct rpc_add_xprt_test rpcdata = { 682 .add_xprt_test = clp->cl_mvops->session_trunk, 683 .data = &xprtdata, 684 }; 685 686 /** 687 * Test this address for session trunking and 688 * add as an alias 689 */ 690 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 691 rpc_clnt_setup_test_and_add_xprt, 692 &rpcdata); 693 if (xprtdata.cred) 694 put_cred(xprtdata.cred); 695 } else { 696 clp = nfs4_set_ds_client(mds_srv, 697 (struct sockaddr *)&da->da_addr, 698 da->da_addrlen, IPPROTO_TCP, 699 timeo, retrans, minor_version); 700 if (IS_ERR(clp)) 701 continue; 702 703 status = nfs4_init_ds_session(clp, 704 mds_srv->nfs_client->cl_lease_time); 705 if (status) { 706 nfs_put_client(clp); 707 clp = ERR_PTR(-EIO); 708 continue; 709 } 710 711 } 712 } 713 714 if (IS_ERR(clp)) { 715 status = PTR_ERR(clp); 716 goto out; 717 } 718 719 smp_wmb(); 720 ds->ds_clp = clp; 721 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 722 out: 723 return status; 724 } 725 726 /* 727 * Create an rpc connection to the nfs4_pnfs_ds data server. 728 * Currently only supports IPv4 and IPv6 addresses. 729 * If connection fails, make devid unavailable and return a -errno. 730 */ 731 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 732 struct nfs4_deviceid_node *devid, unsigned int timeo, 733 unsigned int retrans, u32 version, u32 minor_version) 734 { 735 int err; 736 737 again: 738 err = 0; 739 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { 740 if (version == 3) { 741 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, 742 retrans); 743 } else if (version == 4) { 744 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, 745 retrans, minor_version); 746 } else { 747 dprintk("%s: unsupported DS version %d\n", __func__, 748 version); 749 err = -EPROTONOSUPPORT; 750 } 751 752 nfs4_clear_ds_conn_bit(ds); 753 } else { 754 nfs4_wait_ds_connect(ds); 755 756 /* what was waited on didn't connect AND didn't mark unavail */ 757 if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid)) 758 goto again; 759 } 760 761 /* 762 * At this point the ds->ds_clp should be ready, but it might have 763 * hit an error. 764 */ 765 if (!err) { 766 if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) { 767 WARN_ON_ONCE(ds->ds_clp || 768 !nfs4_test_deviceid_unavailable(devid)); 769 return -EINVAL; 770 } 771 err = nfs_client_init_status(ds->ds_clp); 772 } 773 774 return err; 775 } 776 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); 777 778 /* 779 * Currently only supports ipv4, ipv6 and one multi-path address. 780 */ 781 struct nfs4_pnfs_ds_addr * 782 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) 783 { 784 struct nfs4_pnfs_ds_addr *da = NULL; 785 char *buf, *portstr; 786 __be16 port; 787 int nlen, rlen; 788 int tmp[2]; 789 __be32 *p; 790 char *netid, *match_netid; 791 size_t len, match_netid_len; 792 char *startsep = ""; 793 char *endsep = ""; 794 795 796 /* r_netid */ 797 p = xdr_inline_decode(xdr, 4); 798 if (unlikely(!p)) 799 goto out_err; 800 nlen = be32_to_cpup(p++); 801 802 p = xdr_inline_decode(xdr, nlen); 803 if (unlikely(!p)) 804 goto out_err; 805 806 netid = kmalloc(nlen+1, gfp_flags); 807 if (unlikely(!netid)) 808 goto out_err; 809 810 netid[nlen] = '\0'; 811 memcpy(netid, p, nlen); 812 813 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ 814 p = xdr_inline_decode(xdr, 4); 815 if (unlikely(!p)) 816 goto out_free_netid; 817 rlen = be32_to_cpup(p); 818 819 p = xdr_inline_decode(xdr, rlen); 820 if (unlikely(!p)) 821 goto out_free_netid; 822 823 /* port is ".ABC.DEF", 8 chars max */ 824 if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { 825 dprintk("%s: Invalid address, length %d\n", __func__, 826 rlen); 827 goto out_free_netid; 828 } 829 buf = kmalloc(rlen + 1, gfp_flags); 830 if (!buf) { 831 dprintk("%s: Not enough memory\n", __func__); 832 goto out_free_netid; 833 } 834 buf[rlen] = '\0'; 835 memcpy(buf, p, rlen); 836 837 /* replace port '.' with '-' */ 838 portstr = strrchr(buf, '.'); 839 if (!portstr) { 840 dprintk("%s: Failed finding expected dot in port\n", 841 __func__); 842 goto out_free_buf; 843 } 844 *portstr = '-'; 845 846 /* find '.' between address and port */ 847 portstr = strrchr(buf, '.'); 848 if (!portstr) { 849 dprintk("%s: Failed finding expected dot between address and " 850 "port\n", __func__); 851 goto out_free_buf; 852 } 853 *portstr = '\0'; 854 855 da = kzalloc(sizeof(*da), gfp_flags); 856 if (unlikely(!da)) 857 goto out_free_buf; 858 859 INIT_LIST_HEAD(&da->da_node); 860 861 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, 862 sizeof(da->da_addr))) { 863 dprintk("%s: error parsing address %s\n", __func__, buf); 864 goto out_free_da; 865 } 866 867 portstr++; 868 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); 869 port = htons((tmp[0] << 8) | (tmp[1])); 870 871 switch (da->da_addr.ss_family) { 872 case AF_INET: 873 ((struct sockaddr_in *)&da->da_addr)->sin_port = port; 874 da->da_addrlen = sizeof(struct sockaddr_in); 875 match_netid = "tcp"; 876 match_netid_len = 3; 877 break; 878 879 case AF_INET6: 880 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; 881 da->da_addrlen = sizeof(struct sockaddr_in6); 882 match_netid = "tcp6"; 883 match_netid_len = 4; 884 startsep = "["; 885 endsep = "]"; 886 break; 887 888 default: 889 dprintk("%s: unsupported address family: %u\n", 890 __func__, da->da_addr.ss_family); 891 goto out_free_da; 892 } 893 894 if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { 895 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", 896 __func__, netid, match_netid); 897 goto out_free_da; 898 } 899 900 /* save human readable address */ 901 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; 902 da->da_remotestr = kzalloc(len, gfp_flags); 903 904 /* NULL is ok, only used for dprintk */ 905 if (da->da_remotestr) 906 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, 907 buf, endsep, ntohs(port)); 908 909 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); 910 kfree(buf); 911 kfree(netid); 912 return da; 913 914 out_free_da: 915 kfree(da); 916 out_free_buf: 917 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); 918 kfree(buf); 919 out_free_netid: 920 kfree(netid); 921 out_err: 922 return NULL; 923 } 924 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); 925 926 void 927 pnfs_layout_mark_request_commit(struct nfs_page *req, 928 struct pnfs_layout_segment *lseg, 929 struct nfs_commit_info *cinfo, 930 u32 ds_commit_idx) 931 { 932 struct list_head *list; 933 struct pnfs_commit_bucket *buckets; 934 935 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 936 buckets = cinfo->ds->buckets; 937 list = &buckets[ds_commit_idx].written; 938 if (list_empty(list)) { 939 if (!pnfs_is_valid_lseg(lseg)) { 940 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 941 cinfo->completion_ops->resched_write(cinfo, req); 942 return; 943 } 944 /* Non-empty buckets hold a reference on the lseg. That ref 945 * is normally transferred to the COMMIT call and released 946 * there. It could also be released if the last req is pulled 947 * off due to a rewrite, in which case it will be done in 948 * pnfs_common_clear_request_commit 949 */ 950 WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL); 951 buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg); 952 } 953 set_bit(PG_COMMIT_TO_DS, &req->wb_flags); 954 cinfo->ds->nwritten++; 955 956 nfs_request_add_commit_list_locked(req, list, cinfo); 957 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 958 nfs_mark_page_unstable(req->wb_page, cinfo); 959 } 960 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); 961 962 int 963 pnfs_nfs_generic_sync(struct inode *inode, bool datasync) 964 { 965 int ret; 966 967 if (!pnfs_layoutcommit_outstanding(inode)) 968 return 0; 969 ret = nfs_commit_inode(inode, FLUSH_SYNC); 970 if (ret < 0) 971 return ret; 972 if (datasync) 973 return 0; 974 return pnfs_layoutcommit_inode(inode, true); 975 } 976 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); 977 978