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