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 data = nfs_commitdata_alloc(); 221 if (!data) 222 break; 223 data->ds_commit_index = i; 224 list_add(&data->pages, list); 225 nreq++; 226 } 227 228 /* Clean up on error */ 229 pnfs_generic_retry_commit(cinfo, i); 230 return nreq; 231 } 232 233 static inline 234 void pnfs_fetch_commit_bucket_list(struct list_head *pages, 235 struct nfs_commit_data *data, 236 struct nfs_commit_info *cinfo) 237 { 238 struct pnfs_commit_bucket *bucket; 239 240 bucket = &cinfo->ds->buckets[data->ds_commit_index]; 241 spin_lock(&cinfo->inode->i_lock); 242 list_splice_init(&bucket->committing, pages); 243 data->lseg = bucket->clseg; 244 bucket->clseg = NULL; 245 spin_unlock(&cinfo->inode->i_lock); 246 247 } 248 249 /* Helper function for pnfs_generic_commit_pagelist to catch an empty 250 * page list. This can happen when two commits race. 251 * 252 * This must be called instead of nfs_init_commit - call one or the other, but 253 * not both! 254 */ 255 static bool 256 pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages, 257 struct nfs_commit_data *data, 258 struct nfs_commit_info *cinfo) 259 { 260 if (list_empty(pages)) { 261 if (atomic_dec_and_test(&cinfo->mds->rpcs_out)) 262 wake_up_atomic_t(&cinfo->mds->rpcs_out); 263 /* don't call nfs_commitdata_release - it tries to put 264 * the open_context which is not acquired until nfs_init_commit 265 * which has not been called on @data */ 266 WARN_ON_ONCE(data->context); 267 nfs_commit_free(data); 268 return true; 269 } 270 271 return false; 272 } 273 274 /* This follows nfs_commit_list pretty closely */ 275 int 276 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 277 int how, struct nfs_commit_info *cinfo, 278 int (*initiate_commit)(struct nfs_commit_data *data, 279 int how)) 280 { 281 struct nfs_commit_data *data, *tmp; 282 LIST_HEAD(list); 283 unsigned int nreq = 0; 284 285 if (!list_empty(mds_pages)) { 286 data = nfs_commitdata_alloc(); 287 if (data != NULL) { 288 data->ds_commit_index = -1; 289 list_add(&data->pages, &list); 290 nreq++; 291 } else { 292 nfs_retry_commit(mds_pages, NULL, cinfo, 0); 293 pnfs_generic_retry_commit(cinfo, 0); 294 return -ENOMEM; 295 } 296 } 297 298 nreq += pnfs_generic_alloc_ds_commits(cinfo, &list); 299 300 if (nreq == 0) 301 goto out; 302 303 atomic_add(nreq, &cinfo->mds->rpcs_out); 304 305 list_for_each_entry_safe(data, tmp, &list, pages) { 306 list_del_init(&data->pages); 307 if (data->ds_commit_index < 0) { 308 /* another commit raced with us */ 309 if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages, 310 data, cinfo)) 311 continue; 312 313 nfs_init_commit(data, mds_pages, NULL, cinfo); 314 nfs_initiate_commit(NFS_CLIENT(inode), data, 315 NFS_PROTO(data->inode), 316 data->mds_ops, how, 0); 317 } else { 318 LIST_HEAD(pages); 319 320 pnfs_fetch_commit_bucket_list(&pages, data, cinfo); 321 322 /* another commit raced with us */ 323 if (pnfs_generic_commit_cancel_empty_pagelist(&pages, 324 data, cinfo)) 325 continue; 326 327 nfs_init_commit(data, &pages, data->lseg, cinfo); 328 initiate_commit(data, how); 329 } 330 } 331 out: 332 cinfo->ds->ncommitting = 0; 333 return PNFS_ATTEMPTED; 334 } 335 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); 336 337 /* 338 * Data server cache 339 * 340 * Data servers can be mapped to different device ids. 341 * nfs4_pnfs_ds reference counting 342 * - set to 1 on allocation 343 * - incremented when a device id maps a data server already in the cache. 344 * - decremented when deviceid is removed from the cache. 345 */ 346 static DEFINE_SPINLOCK(nfs4_ds_cache_lock); 347 static LIST_HEAD(nfs4_data_server_cache); 348 349 /* Debug routines */ 350 static void 351 print_ds(struct nfs4_pnfs_ds *ds) 352 { 353 if (ds == NULL) { 354 printk(KERN_WARNING "%s NULL device\n", __func__); 355 return; 356 } 357 printk(KERN_WARNING " ds %s\n" 358 " ref count %d\n" 359 " client %p\n" 360 " cl_exchange_flags %x\n", 361 ds->ds_remotestr, 362 atomic_read(&ds->ds_count), ds->ds_clp, 363 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); 364 } 365 366 static bool 367 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) 368 { 369 struct sockaddr_in *a, *b; 370 struct sockaddr_in6 *a6, *b6; 371 372 if (addr1->sa_family != addr2->sa_family) 373 return false; 374 375 switch (addr1->sa_family) { 376 case AF_INET: 377 a = (struct sockaddr_in *)addr1; 378 b = (struct sockaddr_in *)addr2; 379 380 if (a->sin_addr.s_addr == b->sin_addr.s_addr && 381 a->sin_port == b->sin_port) 382 return true; 383 break; 384 385 case AF_INET6: 386 a6 = (struct sockaddr_in6 *)addr1; 387 b6 = (struct sockaddr_in6 *)addr2; 388 389 /* LINKLOCAL addresses must have matching scope_id */ 390 if (ipv6_addr_src_scope(&a6->sin6_addr) == 391 IPV6_ADDR_SCOPE_LINKLOCAL && 392 a6->sin6_scope_id != b6->sin6_scope_id) 393 return false; 394 395 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && 396 a6->sin6_port == b6->sin6_port) 397 return true; 398 break; 399 400 default: 401 dprintk("%s: unhandled address family: %u\n", 402 __func__, addr1->sa_family); 403 return false; 404 } 405 406 return false; 407 } 408 409 /* 410 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, 411 * declare a match. 412 */ 413 static bool 414 _same_data_server_addrs_locked(const struct list_head *dsaddrs1, 415 const struct list_head *dsaddrs2) 416 { 417 struct nfs4_pnfs_ds_addr *da1, *da2; 418 struct sockaddr *sa1, *sa2; 419 bool match = false; 420 421 list_for_each_entry(da1, dsaddrs1, da_node) { 422 sa1 = (struct sockaddr *)&da1->da_addr; 423 match = false; 424 list_for_each_entry(da2, dsaddrs2, da_node) { 425 sa2 = (struct sockaddr *)&da2->da_addr; 426 match = same_sockaddr(sa1, sa2); 427 if (match) 428 break; 429 } 430 if (!match) 431 break; 432 } 433 return match; 434 } 435 436 /* 437 * Lookup DS by addresses. nfs4_ds_cache_lock is held 438 */ 439 static struct nfs4_pnfs_ds * 440 _data_server_lookup_locked(const struct list_head *dsaddrs) 441 { 442 struct nfs4_pnfs_ds *ds; 443 444 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) 445 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) 446 return ds; 447 return NULL; 448 } 449 450 static void destroy_ds(struct nfs4_pnfs_ds *ds) 451 { 452 struct nfs4_pnfs_ds_addr *da; 453 454 dprintk("--> %s\n", __func__); 455 ifdebug(FACILITY) 456 print_ds(ds); 457 458 nfs_put_client(ds->ds_clp); 459 460 while (!list_empty(&ds->ds_addrs)) { 461 da = list_first_entry(&ds->ds_addrs, 462 struct nfs4_pnfs_ds_addr, 463 da_node); 464 list_del_init(&da->da_node); 465 kfree(da->da_remotestr); 466 kfree(da); 467 } 468 469 kfree(ds->ds_remotestr); 470 kfree(ds); 471 } 472 473 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) 474 { 475 if (atomic_dec_and_lock(&ds->ds_count, 476 &nfs4_ds_cache_lock)) { 477 list_del_init(&ds->ds_node); 478 spin_unlock(&nfs4_ds_cache_lock); 479 destroy_ds(ds); 480 } 481 } 482 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); 483 484 /* 485 * Create a string with a human readable address and port to avoid 486 * complicated setup around many dprinks. 487 */ 488 static char * 489 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) 490 { 491 struct nfs4_pnfs_ds_addr *da; 492 char *remotestr; 493 size_t len; 494 char *p; 495 496 len = 3; /* '{', '}' and eol */ 497 list_for_each_entry(da, dsaddrs, da_node) { 498 len += strlen(da->da_remotestr) + 1; /* string plus comma */ 499 } 500 501 remotestr = kzalloc(len, gfp_flags); 502 if (!remotestr) 503 return NULL; 504 505 p = remotestr; 506 *(p++) = '{'; 507 len--; 508 list_for_each_entry(da, dsaddrs, da_node) { 509 size_t ll = strlen(da->da_remotestr); 510 511 if (ll > len) 512 goto out_err; 513 514 memcpy(p, da->da_remotestr, ll); 515 p += ll; 516 len -= ll; 517 518 if (len < 1) 519 goto out_err; 520 (*p++) = ','; 521 len--; 522 } 523 if (len < 2) 524 goto out_err; 525 *(p++) = '}'; 526 *p = '\0'; 527 return remotestr; 528 out_err: 529 kfree(remotestr); 530 return NULL; 531 } 532 533 /* 534 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if 535 * uncached and return cached struct nfs4_pnfs_ds. 536 */ 537 struct nfs4_pnfs_ds * 538 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) 539 { 540 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; 541 char *remotestr; 542 543 if (list_empty(dsaddrs)) { 544 dprintk("%s: no addresses defined\n", __func__); 545 goto out; 546 } 547 548 ds = kzalloc(sizeof(*ds), gfp_flags); 549 if (!ds) 550 goto out; 551 552 /* this is only used for debugging, so it's ok if its NULL */ 553 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); 554 555 spin_lock(&nfs4_ds_cache_lock); 556 tmp_ds = _data_server_lookup_locked(dsaddrs); 557 if (tmp_ds == NULL) { 558 INIT_LIST_HEAD(&ds->ds_addrs); 559 list_splice_init(dsaddrs, &ds->ds_addrs); 560 ds->ds_remotestr = remotestr; 561 atomic_set(&ds->ds_count, 1); 562 INIT_LIST_HEAD(&ds->ds_node); 563 ds->ds_clp = NULL; 564 list_add(&ds->ds_node, &nfs4_data_server_cache); 565 dprintk("%s add new data server %s\n", __func__, 566 ds->ds_remotestr); 567 } else { 568 kfree(remotestr); 569 kfree(ds); 570 atomic_inc(&tmp_ds->ds_count); 571 dprintk("%s data server %s found, inc'ed ds_count to %d\n", 572 __func__, tmp_ds->ds_remotestr, 573 atomic_read(&tmp_ds->ds_count)); 574 ds = tmp_ds; 575 } 576 spin_unlock(&nfs4_ds_cache_lock); 577 out: 578 return ds; 579 } 580 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); 581 582 static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) 583 { 584 might_sleep(); 585 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, 586 TASK_KILLABLE); 587 } 588 589 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) 590 { 591 smp_mb__before_atomic(); 592 clear_bit(NFS4DS_CONNECTING, &ds->ds_state); 593 smp_mb__after_atomic(); 594 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); 595 } 596 597 static struct nfs_client *(*get_v3_ds_connect)( 598 struct nfs_server *mds_srv, 599 const struct sockaddr *ds_addr, 600 int ds_addrlen, 601 int ds_proto, 602 unsigned int ds_timeo, 603 unsigned int ds_retrans, 604 rpc_authflavor_t au_flavor); 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 EXPORT_SYMBOL_GPL(nfs4_pnfs_v3_ds_connect_unload); 624 625 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, 626 struct nfs4_pnfs_ds *ds, 627 unsigned int timeo, 628 unsigned int retrans, 629 rpc_authflavor_t au_flavor) 630 { 631 struct nfs_client *clp = ERR_PTR(-EIO); 632 struct nfs4_pnfs_ds_addr *da; 633 int status = 0; 634 635 dprintk("--> %s DS %s au_flavor %d\n", __func__, 636 ds->ds_remotestr, au_flavor); 637 638 if (!load_v3_ds_connect()) 639 goto out; 640 641 list_for_each_entry(da, &ds->ds_addrs, da_node) { 642 dprintk("%s: DS %s: trying address %s\n", 643 __func__, ds->ds_remotestr, da->da_remotestr); 644 645 if (!IS_ERR(clp)) { 646 struct xprt_create xprt_args = { 647 .ident = XPRT_TRANSPORT_TCP, 648 .net = clp->cl_net, 649 .dstaddr = (struct sockaddr *)&da->da_addr, 650 .addrlen = da->da_addrlen, 651 .servername = clp->cl_hostname, 652 }; 653 /* Add this address as an alias */ 654 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 655 rpc_clnt_test_and_add_xprt, NULL); 656 } else 657 clp = get_v3_ds_connect(mds_srv, 658 (struct sockaddr *)&da->da_addr, 659 da->da_addrlen, IPPROTO_TCP, 660 timeo, retrans, au_flavor); 661 } 662 663 if (IS_ERR(clp)) { 664 status = PTR_ERR(clp); 665 goto out; 666 } 667 668 smp_wmb(); 669 ds->ds_clp = clp; 670 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 671 out: 672 return status; 673 } 674 675 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, 676 struct nfs4_pnfs_ds *ds, 677 unsigned int timeo, 678 unsigned int retrans, 679 u32 minor_version, 680 rpc_authflavor_t au_flavor) 681 { 682 struct nfs_client *clp = ERR_PTR(-EIO); 683 struct nfs4_pnfs_ds_addr *da; 684 int status = 0; 685 686 dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr, 687 au_flavor); 688 689 list_for_each_entry(da, &ds->ds_addrs, da_node) { 690 dprintk("%s: DS %s: trying address %s\n", 691 __func__, ds->ds_remotestr, da->da_remotestr); 692 693 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 au_flavor); 698 if (!IS_ERR(clp)) 699 break; 700 } 701 702 if (IS_ERR(clp)) { 703 status = PTR_ERR(clp); 704 goto out; 705 } 706 707 status = nfs4_init_ds_session(clp, mds_srv->nfs_client->cl_lease_time); 708 if (status) 709 goto out_put; 710 711 smp_wmb(); 712 ds->ds_clp = clp; 713 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 714 out: 715 return status; 716 out_put: 717 nfs_put_client(clp); 718 goto out; 719 } 720 721 /* 722 * Create an rpc connection to the nfs4_pnfs_ds data server. 723 * Currently only supports IPv4 and IPv6 addresses. 724 * If connection fails, make devid unavailable. 725 */ 726 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 727 struct nfs4_deviceid_node *devid, unsigned int timeo, 728 unsigned int retrans, u32 version, 729 u32 minor_version, rpc_authflavor_t au_flavor) 730 { 731 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { 732 int err = 0; 733 734 if (version == 3) { 735 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, 736 retrans, au_flavor); 737 } else if (version == 4) { 738 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, 739 retrans, minor_version, 740 au_flavor); 741 } else { 742 dprintk("%s: unsupported DS version %d\n", __func__, 743 version); 744 err = -EPROTONOSUPPORT; 745 } 746 747 if (err) 748 nfs4_mark_deviceid_unavailable(devid); 749 nfs4_clear_ds_conn_bit(ds); 750 } else { 751 nfs4_wait_ds_connect(ds); 752 } 753 } 754 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); 755 756 /* 757 * Currently only supports ipv4, ipv6 and one multi-path address. 758 */ 759 struct nfs4_pnfs_ds_addr * 760 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) 761 { 762 struct nfs4_pnfs_ds_addr *da = NULL; 763 char *buf, *portstr; 764 __be16 port; 765 int nlen, rlen; 766 int tmp[2]; 767 __be32 *p; 768 char *netid, *match_netid; 769 size_t len, match_netid_len; 770 char *startsep = ""; 771 char *endsep = ""; 772 773 774 /* r_netid */ 775 p = xdr_inline_decode(xdr, 4); 776 if (unlikely(!p)) 777 goto out_err; 778 nlen = be32_to_cpup(p++); 779 780 p = xdr_inline_decode(xdr, nlen); 781 if (unlikely(!p)) 782 goto out_err; 783 784 netid = kmalloc(nlen+1, gfp_flags); 785 if (unlikely(!netid)) 786 goto out_err; 787 788 netid[nlen] = '\0'; 789 memcpy(netid, p, nlen); 790 791 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ 792 p = xdr_inline_decode(xdr, 4); 793 if (unlikely(!p)) 794 goto out_free_netid; 795 rlen = be32_to_cpup(p); 796 797 p = xdr_inline_decode(xdr, rlen); 798 if (unlikely(!p)) 799 goto out_free_netid; 800 801 /* port is ".ABC.DEF", 8 chars max */ 802 if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { 803 dprintk("%s: Invalid address, length %d\n", __func__, 804 rlen); 805 goto out_free_netid; 806 } 807 buf = kmalloc(rlen + 1, gfp_flags); 808 if (!buf) { 809 dprintk("%s: Not enough memory\n", __func__); 810 goto out_free_netid; 811 } 812 buf[rlen] = '\0'; 813 memcpy(buf, p, rlen); 814 815 /* replace port '.' with '-' */ 816 portstr = strrchr(buf, '.'); 817 if (!portstr) { 818 dprintk("%s: Failed finding expected dot in port\n", 819 __func__); 820 goto out_free_buf; 821 } 822 *portstr = '-'; 823 824 /* find '.' between address and port */ 825 portstr = strrchr(buf, '.'); 826 if (!portstr) { 827 dprintk("%s: Failed finding expected dot between address and " 828 "port\n", __func__); 829 goto out_free_buf; 830 } 831 *portstr = '\0'; 832 833 da = kzalloc(sizeof(*da), gfp_flags); 834 if (unlikely(!da)) 835 goto out_free_buf; 836 837 INIT_LIST_HEAD(&da->da_node); 838 839 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, 840 sizeof(da->da_addr))) { 841 dprintk("%s: error parsing address %s\n", __func__, buf); 842 goto out_free_da; 843 } 844 845 portstr++; 846 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); 847 port = htons((tmp[0] << 8) | (tmp[1])); 848 849 switch (da->da_addr.ss_family) { 850 case AF_INET: 851 ((struct sockaddr_in *)&da->da_addr)->sin_port = port; 852 da->da_addrlen = sizeof(struct sockaddr_in); 853 match_netid = "tcp"; 854 match_netid_len = 3; 855 break; 856 857 case AF_INET6: 858 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; 859 da->da_addrlen = sizeof(struct sockaddr_in6); 860 match_netid = "tcp6"; 861 match_netid_len = 4; 862 startsep = "["; 863 endsep = "]"; 864 break; 865 866 default: 867 dprintk("%s: unsupported address family: %u\n", 868 __func__, da->da_addr.ss_family); 869 goto out_free_da; 870 } 871 872 if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { 873 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", 874 __func__, netid, match_netid); 875 goto out_free_da; 876 } 877 878 /* save human readable address */ 879 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; 880 da->da_remotestr = kzalloc(len, gfp_flags); 881 882 /* NULL is ok, only used for dprintk */ 883 if (da->da_remotestr) 884 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, 885 buf, endsep, ntohs(port)); 886 887 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); 888 kfree(buf); 889 kfree(netid); 890 return da; 891 892 out_free_da: 893 kfree(da); 894 out_free_buf: 895 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); 896 kfree(buf); 897 out_free_netid: 898 kfree(netid); 899 out_err: 900 return NULL; 901 } 902 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); 903 904 void 905 pnfs_layout_mark_request_commit(struct nfs_page *req, 906 struct pnfs_layout_segment *lseg, 907 struct nfs_commit_info *cinfo, 908 u32 ds_commit_idx) 909 { 910 struct list_head *list; 911 struct pnfs_commit_bucket *buckets; 912 913 spin_lock(&cinfo->inode->i_lock); 914 buckets = cinfo->ds->buckets; 915 list = &buckets[ds_commit_idx].written; 916 if (list_empty(list)) { 917 if (!pnfs_is_valid_lseg(lseg)) { 918 spin_unlock(&cinfo->inode->i_lock); 919 cinfo->completion_ops->resched_write(cinfo, req); 920 return; 921 } 922 /* Non-empty buckets hold a reference on the lseg. That ref 923 * is normally transferred to the COMMIT call and released 924 * there. It could also be released if the last req is pulled 925 * off due to a rewrite, in which case it will be done in 926 * pnfs_common_clear_request_commit 927 */ 928 WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL); 929 buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg); 930 } 931 set_bit(PG_COMMIT_TO_DS, &req->wb_flags); 932 cinfo->ds->nwritten++; 933 934 nfs_request_add_commit_list_locked(req, list, cinfo); 935 spin_unlock(&cinfo->inode->i_lock); 936 nfs_mark_page_unstable(req->wb_page, cinfo); 937 } 938 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); 939 940 int 941 pnfs_nfs_generic_sync(struct inode *inode, bool datasync) 942 { 943 int ret; 944 945 if (!pnfs_layoutcommit_outstanding(inode)) 946 return 0; 947 ret = nfs_commit_inode(inode, FLUSH_SYNC); 948 if (ret < 0) 949 return ret; 950 if (datasync) 951 return 0; 952 return pnfs_layoutcommit_inode(inode, true); 953 } 954 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); 955 956