1 /* 2 * Common NFS I/O operations for the pnfs file based 3 * layout drivers. 4 * 5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved. 6 * 7 * Tom Haynes <loghyr@primarydata.com> 8 */ 9 10 #include <linux/nfs_fs.h> 11 #include <linux/nfs_page.h> 12 #include <linux/sunrpc/addr.h> 13 #include <linux/module.h> 14 15 #include "nfs4session.h" 16 #include "internal.h" 17 #include "pnfs.h" 18 19 #define NFSDBG_FACILITY NFSDBG_PNFS 20 21 void pnfs_generic_rw_release(void *data) 22 { 23 struct nfs_pgio_header *hdr = data; 24 25 nfs_put_client(hdr->ds_clp); 26 hdr->mds_ops->rpc_release(data); 27 } 28 EXPORT_SYMBOL_GPL(pnfs_generic_rw_release); 29 30 /* Fake up some data that will cause nfs_commit_release to retry the writes. */ 31 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data) 32 { 33 struct nfs_page *first = nfs_list_entry(data->pages.next); 34 35 data->task.tk_status = 0; 36 memcpy(&data->verf.verifier, &first->wb_verf, 37 sizeof(data->verf.verifier)); 38 data->verf.verifier.data[0]++; /* ensure verifier mismatch */ 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 i_lock 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_locked(freeme); 87 } 88 EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit); 89 90 static int 91 pnfs_generic_transfer_commit_list(struct list_head *src, struct list_head *dst, 92 struct nfs_commit_info *cinfo, int max) 93 { 94 struct nfs_page *req, *tmp; 95 int ret = 0; 96 97 list_for_each_entry_safe(req, tmp, src, wb_list) { 98 if (!nfs_lock_request(req)) 99 continue; 100 kref_get(&req->wb_kref); 101 if (cond_resched_lock(&cinfo->inode->i_lock)) 102 list_safe_reset_next(req, tmp, wb_list); 103 nfs_request_remove_commit_list(req, cinfo); 104 clear_bit(PG_COMMIT_TO_DS, &req->wb_flags); 105 nfs_list_add_request(req, dst); 106 ret++; 107 if ((ret == max) && !cinfo->dreq) 108 break; 109 } 110 return ret; 111 } 112 113 static int 114 pnfs_generic_scan_ds_commit_list(struct pnfs_commit_bucket *bucket, 115 struct nfs_commit_info *cinfo, 116 int max) 117 { 118 struct list_head *src = &bucket->written; 119 struct list_head *dst = &bucket->committing; 120 int ret; 121 122 lockdep_assert_held(&cinfo->inode->i_lock); 123 ret = pnfs_generic_transfer_commit_list(src, dst, cinfo, max); 124 if (ret) { 125 cinfo->ds->nwritten -= ret; 126 cinfo->ds->ncommitting += ret; 127 if (bucket->clseg == NULL) 128 bucket->clseg = pnfs_get_lseg(bucket->wlseg); 129 if (list_empty(src)) { 130 pnfs_put_lseg_locked(bucket->wlseg); 131 bucket->wlseg = NULL; 132 } 133 } 134 return ret; 135 } 136 137 /* Move reqs from written to committing lists, returning count 138 * of number moved. 139 */ 140 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, 141 int max) 142 { 143 int i, rv = 0, cnt; 144 145 lockdep_assert_held(&cinfo->inode->i_lock); 146 for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) { 147 cnt = pnfs_generic_scan_ds_commit_list(&cinfo->ds->buckets[i], 148 cinfo, max); 149 max -= cnt; 150 rv += cnt; 151 } 152 return rv; 153 } 154 EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists); 155 156 /* Pull everything off the committing lists and dump into @dst. */ 157 void pnfs_generic_recover_commit_reqs(struct list_head *dst, 158 struct nfs_commit_info *cinfo) 159 { 160 struct pnfs_commit_bucket *b; 161 struct pnfs_layout_segment *freeme; 162 int i; 163 164 lockdep_assert_held(&cinfo->inode->i_lock); 165 restart: 166 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { 167 if (pnfs_generic_transfer_commit_list(&b->written, dst, 168 cinfo, 0)) { 169 freeme = b->wlseg; 170 b->wlseg = NULL; 171 spin_unlock(&cinfo->inode->i_lock); 172 pnfs_put_lseg(freeme); 173 spin_lock(&cinfo->inode->i_lock); 174 goto restart; 175 } 176 } 177 cinfo->ds->nwritten = 0; 178 } 179 EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs); 180 181 static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx) 182 { 183 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 184 struct pnfs_commit_bucket *bucket; 185 struct pnfs_layout_segment *freeme; 186 LIST_HEAD(pages); 187 int i; 188 189 spin_lock(&cinfo->inode->i_lock); 190 for (i = idx; i < fl_cinfo->nbuckets; i++) { 191 bucket = &fl_cinfo->buckets[i]; 192 if (list_empty(&bucket->committing)) 193 continue; 194 freeme = bucket->clseg; 195 bucket->clseg = NULL; 196 list_splice_init(&bucket->committing, &pages); 197 spin_unlock(&cinfo->inode->i_lock); 198 nfs_retry_commit(&pages, freeme, cinfo, i); 199 pnfs_put_lseg(freeme); 200 spin_lock(&cinfo->inode->i_lock); 201 } 202 spin_unlock(&cinfo->inode->i_lock); 203 } 204 205 static unsigned int 206 pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo, 207 struct list_head *list) 208 { 209 struct pnfs_ds_commit_info *fl_cinfo; 210 struct pnfs_commit_bucket *bucket; 211 struct nfs_commit_data *data; 212 int i; 213 unsigned int nreq = 0; 214 215 fl_cinfo = cinfo->ds; 216 bucket = fl_cinfo->buckets; 217 for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) { 218 if (list_empty(&bucket->committing)) 219 continue; 220 /* 221 * If the layout segment is invalid, then let 222 * pnfs_generic_retry_commit() clean up the bucket. 223 */ 224 if (bucket->clseg && !pnfs_is_valid_lseg(bucket->clseg) && 225 !test_bit(NFS_LSEG_LAYOUTRETURN, &bucket->clseg->pls_flags)) 226 break; 227 data = nfs_commitdata_alloc(false); 228 if (!data) 229 break; 230 data->ds_commit_index = i; 231 list_add(&data->pages, list); 232 nreq++; 233 } 234 235 /* Clean up on error */ 236 pnfs_generic_retry_commit(cinfo, i); 237 return nreq; 238 } 239 240 static inline 241 void pnfs_fetch_commit_bucket_list(struct list_head *pages, 242 struct nfs_commit_data *data, 243 struct nfs_commit_info *cinfo) 244 { 245 struct pnfs_commit_bucket *bucket; 246 247 bucket = &cinfo->ds->buckets[data->ds_commit_index]; 248 spin_lock(&cinfo->inode->i_lock); 249 list_splice_init(&bucket->committing, pages); 250 data->lseg = bucket->clseg; 251 bucket->clseg = NULL; 252 spin_unlock(&cinfo->inode->i_lock); 253 254 } 255 256 /* Helper function for pnfs_generic_commit_pagelist to catch an empty 257 * page list. This can happen when two commits race. 258 * 259 * This must be called instead of nfs_init_commit - call one or the other, but 260 * not both! 261 */ 262 static bool 263 pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages, 264 struct nfs_commit_data *data, 265 struct nfs_commit_info *cinfo) 266 { 267 if (list_empty(pages)) { 268 if (atomic_dec_and_test(&cinfo->mds->rpcs_out)) 269 wake_up_atomic_t(&cinfo->mds->rpcs_out); 270 /* don't call nfs_commitdata_release - it tries to put 271 * the open_context which is not acquired until nfs_init_commit 272 * which has not been called on @data */ 273 WARN_ON_ONCE(data->context); 274 nfs_commit_free(data); 275 return true; 276 } 277 278 return false; 279 } 280 281 /* This follows nfs_commit_list pretty closely */ 282 int 283 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 284 int how, struct nfs_commit_info *cinfo, 285 int (*initiate_commit)(struct nfs_commit_data *data, 286 int how)) 287 { 288 struct nfs_commit_data *data, *tmp; 289 LIST_HEAD(list); 290 unsigned int nreq = 0; 291 292 if (!list_empty(mds_pages)) { 293 data = nfs_commitdata_alloc(true); 294 data->ds_commit_index = -1; 295 list_add(&data->pages, &list); 296 nreq++; 297 } 298 299 nreq += pnfs_generic_alloc_ds_commits(cinfo, &list); 300 301 if (nreq == 0) 302 goto out; 303 304 atomic_add(nreq, &cinfo->mds->rpcs_out); 305 306 list_for_each_entry_safe(data, tmp, &list, pages) { 307 list_del_init(&data->pages); 308 if (data->ds_commit_index < 0) { 309 /* another commit raced with us */ 310 if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages, 311 data, cinfo)) 312 continue; 313 314 nfs_init_commit(data, mds_pages, NULL, cinfo); 315 nfs_initiate_commit(NFS_CLIENT(inode), data, 316 NFS_PROTO(data->inode), 317 data->mds_ops, how, 0); 318 } else { 319 LIST_HEAD(pages); 320 321 pnfs_fetch_commit_bucket_list(&pages, data, cinfo); 322 323 /* another commit raced with us */ 324 if (pnfs_generic_commit_cancel_empty_pagelist(&pages, 325 data, cinfo)) 326 continue; 327 328 nfs_init_commit(data, &pages, data->lseg, cinfo); 329 initiate_commit(data, how); 330 } 331 } 332 out: 333 cinfo->ds->ncommitting = 0; 334 return PNFS_ATTEMPTED; 335 } 336 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); 337 338 /* 339 * Data server cache 340 * 341 * Data servers can be mapped to different device ids. 342 * nfs4_pnfs_ds reference counting 343 * - set to 1 on allocation 344 * - incremented when a device id maps a data server already in the cache. 345 * - decremented when deviceid is removed from the cache. 346 */ 347 static DEFINE_SPINLOCK(nfs4_ds_cache_lock); 348 static LIST_HEAD(nfs4_data_server_cache); 349 350 /* Debug routines */ 351 static void 352 print_ds(struct nfs4_pnfs_ds *ds) 353 { 354 if (ds == NULL) { 355 printk(KERN_WARNING "%s NULL device\n", __func__); 356 return; 357 } 358 printk(KERN_WARNING " ds %s\n" 359 " ref count %d\n" 360 " client %p\n" 361 " cl_exchange_flags %x\n", 362 ds->ds_remotestr, 363 atomic_read(&ds->ds_count), ds->ds_clp, 364 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); 365 } 366 367 static bool 368 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) 369 { 370 struct sockaddr_in *a, *b; 371 struct sockaddr_in6 *a6, *b6; 372 373 if (addr1->sa_family != addr2->sa_family) 374 return false; 375 376 switch (addr1->sa_family) { 377 case AF_INET: 378 a = (struct sockaddr_in *)addr1; 379 b = (struct sockaddr_in *)addr2; 380 381 if (a->sin_addr.s_addr == b->sin_addr.s_addr && 382 a->sin_port == b->sin_port) 383 return true; 384 break; 385 386 case AF_INET6: 387 a6 = (struct sockaddr_in6 *)addr1; 388 b6 = (struct sockaddr_in6 *)addr2; 389 390 /* LINKLOCAL addresses must have matching scope_id */ 391 if (ipv6_addr_src_scope(&a6->sin6_addr) == 392 IPV6_ADDR_SCOPE_LINKLOCAL && 393 a6->sin6_scope_id != b6->sin6_scope_id) 394 return false; 395 396 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && 397 a6->sin6_port == b6->sin6_port) 398 return true; 399 break; 400 401 default: 402 dprintk("%s: unhandled address family: %u\n", 403 __func__, addr1->sa_family); 404 return false; 405 } 406 407 return false; 408 } 409 410 /* 411 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, 412 * declare a match. 413 */ 414 static bool 415 _same_data_server_addrs_locked(const struct list_head *dsaddrs1, 416 const struct list_head *dsaddrs2) 417 { 418 struct nfs4_pnfs_ds_addr *da1, *da2; 419 struct sockaddr *sa1, *sa2; 420 bool match = false; 421 422 list_for_each_entry(da1, dsaddrs1, da_node) { 423 sa1 = (struct sockaddr *)&da1->da_addr; 424 match = false; 425 list_for_each_entry(da2, dsaddrs2, da_node) { 426 sa2 = (struct sockaddr *)&da2->da_addr; 427 match = same_sockaddr(sa1, sa2); 428 if (match) 429 break; 430 } 431 if (!match) 432 break; 433 } 434 return match; 435 } 436 437 /* 438 * Lookup DS by addresses. nfs4_ds_cache_lock is held 439 */ 440 static struct nfs4_pnfs_ds * 441 _data_server_lookup_locked(const struct list_head *dsaddrs) 442 { 443 struct nfs4_pnfs_ds *ds; 444 445 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) 446 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) 447 return ds; 448 return NULL; 449 } 450 451 static void destroy_ds(struct nfs4_pnfs_ds *ds) 452 { 453 struct nfs4_pnfs_ds_addr *da; 454 455 dprintk("--> %s\n", __func__); 456 ifdebug(FACILITY) 457 print_ds(ds); 458 459 nfs_put_client(ds->ds_clp); 460 461 while (!list_empty(&ds->ds_addrs)) { 462 da = list_first_entry(&ds->ds_addrs, 463 struct nfs4_pnfs_ds_addr, 464 da_node); 465 list_del_init(&da->da_node); 466 kfree(da->da_remotestr); 467 kfree(da); 468 } 469 470 kfree(ds->ds_remotestr); 471 kfree(ds); 472 } 473 474 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) 475 { 476 if (atomic_dec_and_lock(&ds->ds_count, 477 &nfs4_ds_cache_lock)) { 478 list_del_init(&ds->ds_node); 479 spin_unlock(&nfs4_ds_cache_lock); 480 destroy_ds(ds); 481 } 482 } 483 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); 484 485 /* 486 * Create a string with a human readable address and port to avoid 487 * complicated setup around many dprinks. 488 */ 489 static char * 490 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) 491 { 492 struct nfs4_pnfs_ds_addr *da; 493 char *remotestr; 494 size_t len; 495 char *p; 496 497 len = 3; /* '{', '}' and eol */ 498 list_for_each_entry(da, dsaddrs, da_node) { 499 len += strlen(da->da_remotestr) + 1; /* string plus comma */ 500 } 501 502 remotestr = kzalloc(len, gfp_flags); 503 if (!remotestr) 504 return NULL; 505 506 p = remotestr; 507 *(p++) = '{'; 508 len--; 509 list_for_each_entry(da, dsaddrs, da_node) { 510 size_t ll = strlen(da->da_remotestr); 511 512 if (ll > len) 513 goto out_err; 514 515 memcpy(p, da->da_remotestr, ll); 516 p += ll; 517 len -= ll; 518 519 if (len < 1) 520 goto out_err; 521 (*p++) = ','; 522 len--; 523 } 524 if (len < 2) 525 goto out_err; 526 *(p++) = '}'; 527 *p = '\0'; 528 return remotestr; 529 out_err: 530 kfree(remotestr); 531 return NULL; 532 } 533 534 /* 535 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if 536 * uncached and return cached struct nfs4_pnfs_ds. 537 */ 538 struct nfs4_pnfs_ds * 539 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) 540 { 541 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; 542 char *remotestr; 543 544 if (list_empty(dsaddrs)) { 545 dprintk("%s: no addresses defined\n", __func__); 546 goto out; 547 } 548 549 ds = kzalloc(sizeof(*ds), gfp_flags); 550 if (!ds) 551 goto out; 552 553 /* this is only used for debugging, so it's ok if its NULL */ 554 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); 555 556 spin_lock(&nfs4_ds_cache_lock); 557 tmp_ds = _data_server_lookup_locked(dsaddrs); 558 if (tmp_ds == NULL) { 559 INIT_LIST_HEAD(&ds->ds_addrs); 560 list_splice_init(dsaddrs, &ds->ds_addrs); 561 ds->ds_remotestr = remotestr; 562 atomic_set(&ds->ds_count, 1); 563 INIT_LIST_HEAD(&ds->ds_node); 564 ds->ds_clp = NULL; 565 list_add(&ds->ds_node, &nfs4_data_server_cache); 566 dprintk("%s add new data server %s\n", __func__, 567 ds->ds_remotestr); 568 } else { 569 kfree(remotestr); 570 kfree(ds); 571 atomic_inc(&tmp_ds->ds_count); 572 dprintk("%s data server %s found, inc'ed ds_count to %d\n", 573 __func__, tmp_ds->ds_remotestr, 574 atomic_read(&tmp_ds->ds_count)); 575 ds = tmp_ds; 576 } 577 spin_unlock(&nfs4_ds_cache_lock); 578 out: 579 return ds; 580 } 581 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); 582 583 static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) 584 { 585 might_sleep(); 586 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, 587 TASK_KILLABLE); 588 } 589 590 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) 591 { 592 smp_mb__before_atomic(); 593 clear_bit(NFS4DS_CONNECTING, &ds->ds_state); 594 smp_mb__after_atomic(); 595 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); 596 } 597 598 static struct nfs_client *(*get_v3_ds_connect)( 599 struct nfs_server *mds_srv, 600 const struct sockaddr *ds_addr, 601 int ds_addrlen, 602 int ds_proto, 603 unsigned int ds_timeo, 604 unsigned int ds_retrans); 605 606 static bool load_v3_ds_connect(void) 607 { 608 if (!get_v3_ds_connect) { 609 get_v3_ds_connect = symbol_request(nfs3_set_ds_client); 610 WARN_ON_ONCE(!get_v3_ds_connect); 611 } 612 613 return(get_v3_ds_connect != NULL); 614 } 615 616 void nfs4_pnfs_v3_ds_connect_unload(void) 617 { 618 if (get_v3_ds_connect) { 619 symbol_put(nfs3_set_ds_client); 620 get_v3_ds_connect = NULL; 621 } 622 } 623 624 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, 625 struct nfs4_pnfs_ds *ds, 626 unsigned int timeo, 627 unsigned int retrans) 628 { 629 struct nfs_client *clp = ERR_PTR(-EIO); 630 struct nfs4_pnfs_ds_addr *da; 631 int status = 0; 632 633 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); 634 635 if (!load_v3_ds_connect()) 636 goto out; 637 638 list_for_each_entry(da, &ds->ds_addrs, da_node) { 639 dprintk("%s: DS %s: trying address %s\n", 640 __func__, ds->ds_remotestr, da->da_remotestr); 641 642 if (!IS_ERR(clp)) { 643 struct xprt_create xprt_args = { 644 .ident = XPRT_TRANSPORT_TCP, 645 .net = clp->cl_net, 646 .dstaddr = (struct sockaddr *)&da->da_addr, 647 .addrlen = da->da_addrlen, 648 .servername = clp->cl_hostname, 649 }; 650 /* Add this address as an alias */ 651 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 652 rpc_clnt_test_and_add_xprt, NULL); 653 } else 654 clp = get_v3_ds_connect(mds_srv, 655 (struct sockaddr *)&da->da_addr, 656 da->da_addrlen, IPPROTO_TCP, 657 timeo, retrans); 658 } 659 660 if (IS_ERR(clp)) { 661 status = PTR_ERR(clp); 662 goto out; 663 } 664 665 smp_wmb(); 666 ds->ds_clp = clp; 667 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 668 out: 669 return status; 670 } 671 672 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, 673 struct nfs4_pnfs_ds *ds, 674 unsigned int timeo, 675 unsigned int retrans, 676 u32 minor_version) 677 { 678 struct nfs_client *clp = ERR_PTR(-EIO); 679 struct nfs4_pnfs_ds_addr *da; 680 int status = 0; 681 682 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); 683 684 list_for_each_entry(da, &ds->ds_addrs, da_node) { 685 dprintk("%s: DS %s: trying address %s\n", 686 __func__, ds->ds_remotestr, da->da_remotestr); 687 688 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { 689 struct xprt_create xprt_args = { 690 .ident = XPRT_TRANSPORT_TCP, 691 .net = clp->cl_net, 692 .dstaddr = (struct sockaddr *)&da->da_addr, 693 .addrlen = da->da_addrlen, 694 .servername = clp->cl_hostname, 695 }; 696 struct nfs4_add_xprt_data xprtdata = { 697 .clp = clp, 698 .cred = nfs4_get_clid_cred(clp), 699 }; 700 struct rpc_add_xprt_test rpcdata = { 701 .add_xprt_test = clp->cl_mvops->session_trunk, 702 .data = &xprtdata, 703 }; 704 705 /** 706 * Test this address for session trunking and 707 * add as an alias 708 */ 709 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 710 rpc_clnt_setup_test_and_add_xprt, 711 &rpcdata); 712 if (xprtdata.cred) 713 put_rpccred(xprtdata.cred); 714 } else { 715 clp = nfs4_set_ds_client(mds_srv, 716 (struct sockaddr *)&da->da_addr, 717 da->da_addrlen, IPPROTO_TCP, 718 timeo, retrans, minor_version); 719 if (IS_ERR(clp)) 720 continue; 721 722 status = nfs4_init_ds_session(clp, 723 mds_srv->nfs_client->cl_lease_time); 724 if (status) { 725 nfs_put_client(clp); 726 clp = ERR_PTR(-EIO); 727 continue; 728 } 729 730 } 731 } 732 733 if (IS_ERR(clp)) { 734 status = PTR_ERR(clp); 735 goto out; 736 } 737 738 smp_wmb(); 739 ds->ds_clp = clp; 740 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 741 out: 742 return status; 743 } 744 745 /* 746 * Create an rpc connection to the nfs4_pnfs_ds data server. 747 * Currently only supports IPv4 and IPv6 addresses. 748 * If connection fails, make devid unavailable and return a -errno. 749 */ 750 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 751 struct nfs4_deviceid_node *devid, unsigned int timeo, 752 unsigned int retrans, u32 version, u32 minor_version) 753 { 754 int err; 755 756 again: 757 err = 0; 758 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { 759 if (version == 3) { 760 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, 761 retrans); 762 } else if (version == 4) { 763 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, 764 retrans, minor_version); 765 } else { 766 dprintk("%s: unsupported DS version %d\n", __func__, 767 version); 768 err = -EPROTONOSUPPORT; 769 } 770 771 nfs4_clear_ds_conn_bit(ds); 772 } else { 773 nfs4_wait_ds_connect(ds); 774 775 /* what was waited on didn't connect AND didn't mark unavail */ 776 if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid)) 777 goto again; 778 } 779 780 /* 781 * At this point the ds->ds_clp should be ready, but it might have 782 * hit an error. 783 */ 784 if (!err) { 785 if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) { 786 WARN_ON_ONCE(ds->ds_clp || 787 !nfs4_test_deviceid_unavailable(devid)); 788 return -EINVAL; 789 } 790 err = nfs_client_init_status(ds->ds_clp); 791 } 792 793 return err; 794 } 795 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); 796 797 /* 798 * Currently only supports ipv4, ipv6 and one multi-path address. 799 */ 800 struct nfs4_pnfs_ds_addr * 801 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) 802 { 803 struct nfs4_pnfs_ds_addr *da = NULL; 804 char *buf, *portstr; 805 __be16 port; 806 int nlen, rlen; 807 int tmp[2]; 808 __be32 *p; 809 char *netid, *match_netid; 810 size_t len, match_netid_len; 811 char *startsep = ""; 812 char *endsep = ""; 813 814 815 /* r_netid */ 816 p = xdr_inline_decode(xdr, 4); 817 if (unlikely(!p)) 818 goto out_err; 819 nlen = be32_to_cpup(p++); 820 821 p = xdr_inline_decode(xdr, nlen); 822 if (unlikely(!p)) 823 goto out_err; 824 825 netid = kmalloc(nlen+1, gfp_flags); 826 if (unlikely(!netid)) 827 goto out_err; 828 829 netid[nlen] = '\0'; 830 memcpy(netid, p, nlen); 831 832 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ 833 p = xdr_inline_decode(xdr, 4); 834 if (unlikely(!p)) 835 goto out_free_netid; 836 rlen = be32_to_cpup(p); 837 838 p = xdr_inline_decode(xdr, rlen); 839 if (unlikely(!p)) 840 goto out_free_netid; 841 842 /* port is ".ABC.DEF", 8 chars max */ 843 if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { 844 dprintk("%s: Invalid address, length %d\n", __func__, 845 rlen); 846 goto out_free_netid; 847 } 848 buf = kmalloc(rlen + 1, gfp_flags); 849 if (!buf) { 850 dprintk("%s: Not enough memory\n", __func__); 851 goto out_free_netid; 852 } 853 buf[rlen] = '\0'; 854 memcpy(buf, p, rlen); 855 856 /* replace port '.' with '-' */ 857 portstr = strrchr(buf, '.'); 858 if (!portstr) { 859 dprintk("%s: Failed finding expected dot in port\n", 860 __func__); 861 goto out_free_buf; 862 } 863 *portstr = '-'; 864 865 /* find '.' between address and port */ 866 portstr = strrchr(buf, '.'); 867 if (!portstr) { 868 dprintk("%s: Failed finding expected dot between address and " 869 "port\n", __func__); 870 goto out_free_buf; 871 } 872 *portstr = '\0'; 873 874 da = kzalloc(sizeof(*da), gfp_flags); 875 if (unlikely(!da)) 876 goto out_free_buf; 877 878 INIT_LIST_HEAD(&da->da_node); 879 880 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, 881 sizeof(da->da_addr))) { 882 dprintk("%s: error parsing address %s\n", __func__, buf); 883 goto out_free_da; 884 } 885 886 portstr++; 887 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); 888 port = htons((tmp[0] << 8) | (tmp[1])); 889 890 switch (da->da_addr.ss_family) { 891 case AF_INET: 892 ((struct sockaddr_in *)&da->da_addr)->sin_port = port; 893 da->da_addrlen = sizeof(struct sockaddr_in); 894 match_netid = "tcp"; 895 match_netid_len = 3; 896 break; 897 898 case AF_INET6: 899 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; 900 da->da_addrlen = sizeof(struct sockaddr_in6); 901 match_netid = "tcp6"; 902 match_netid_len = 4; 903 startsep = "["; 904 endsep = "]"; 905 break; 906 907 default: 908 dprintk("%s: unsupported address family: %u\n", 909 __func__, da->da_addr.ss_family); 910 goto out_free_da; 911 } 912 913 if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { 914 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", 915 __func__, netid, match_netid); 916 goto out_free_da; 917 } 918 919 /* save human readable address */ 920 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; 921 da->da_remotestr = kzalloc(len, gfp_flags); 922 923 /* NULL is ok, only used for dprintk */ 924 if (da->da_remotestr) 925 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, 926 buf, endsep, ntohs(port)); 927 928 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); 929 kfree(buf); 930 kfree(netid); 931 return da; 932 933 out_free_da: 934 kfree(da); 935 out_free_buf: 936 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); 937 kfree(buf); 938 out_free_netid: 939 kfree(netid); 940 out_err: 941 return NULL; 942 } 943 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); 944 945 void 946 pnfs_layout_mark_request_commit(struct nfs_page *req, 947 struct pnfs_layout_segment *lseg, 948 struct nfs_commit_info *cinfo, 949 u32 ds_commit_idx) 950 { 951 struct list_head *list; 952 struct pnfs_commit_bucket *buckets; 953 954 spin_lock(&cinfo->inode->i_lock); 955 buckets = cinfo->ds->buckets; 956 list = &buckets[ds_commit_idx].written; 957 if (list_empty(list)) { 958 if (!pnfs_is_valid_lseg(lseg)) { 959 spin_unlock(&cinfo->inode->i_lock); 960 cinfo->completion_ops->resched_write(cinfo, req); 961 return; 962 } 963 /* Non-empty buckets hold a reference on the lseg. That ref 964 * is normally transferred to the COMMIT call and released 965 * there. It could also be released if the last req is pulled 966 * off due to a rewrite, in which case it will be done in 967 * pnfs_common_clear_request_commit 968 */ 969 WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL); 970 buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg); 971 } 972 set_bit(PG_COMMIT_TO_DS, &req->wb_flags); 973 cinfo->ds->nwritten++; 974 975 nfs_request_add_commit_list_locked(req, list, cinfo); 976 spin_unlock(&cinfo->inode->i_lock); 977 nfs_mark_page_unstable(req->wb_page, cinfo); 978 } 979 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); 980 981 int 982 pnfs_nfs_generic_sync(struct inode *inode, bool datasync) 983 { 984 int ret; 985 986 if (!pnfs_layoutcommit_outstanding(inode)) 987 return 0; 988 ret = nfs_commit_inode(inode, FLUSH_SYNC); 989 if (ret < 0) 990 return ret; 991 if (datasync) 992 return 0; 993 return pnfs_layoutcommit_inode(inode, true); 994 } 995 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); 996 997