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