1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Common NFS I/O operations for the pnfs file based 4 * layout drivers. 5 * 6 * Copyright (c) 2014, Primary Data, Inc. All rights reserved. 7 * 8 * Tom Haynes <loghyr@primarydata.com> 9 */ 10 11 #include <linux/nfs_fs.h> 12 #include <linux/nfs_page.h> 13 #include <linux/sunrpc/addr.h> 14 #include <linux/module.h> 15 16 #include "nfs4session.h" 17 #include "internal.h" 18 #include "pnfs.h" 19 20 #define NFSDBG_FACILITY NFSDBG_PNFS 21 22 void pnfs_generic_rw_release(void *data) 23 { 24 struct nfs_pgio_header *hdr = data; 25 26 nfs_put_client(hdr->ds_clp); 27 hdr->mds_ops->rpc_release(data); 28 } 29 EXPORT_SYMBOL_GPL(pnfs_generic_rw_release); 30 31 /* Fake up some data that will cause nfs_commit_release to retry the writes. */ 32 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data) 33 { 34 struct nfs_writeverf *verf = data->res.verf; 35 36 data->task.tk_status = 0; 37 memset(&verf->verifier, 0, sizeof(verf->verifier)); 38 verf->committed = NFS_UNSTABLE; 39 } 40 EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes); 41 42 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data) 43 { 44 struct nfs_commit_data *wdata = data; 45 46 /* Note this may cause RPC to be resent */ 47 wdata->mds_ops->rpc_call_done(task, data); 48 } 49 EXPORT_SYMBOL_GPL(pnfs_generic_write_commit_done); 50 51 void pnfs_generic_commit_release(void *calldata) 52 { 53 struct nfs_commit_data *data = calldata; 54 55 data->completion_ops->completion(data); 56 pnfs_put_lseg(data->lseg); 57 nfs_put_client(data->ds_clp); 58 nfs_commitdata_release(data); 59 } 60 EXPORT_SYMBOL_GPL(pnfs_generic_commit_release); 61 62 static struct pnfs_layout_segment * 63 pnfs_free_bucket_lseg(struct pnfs_commit_bucket *bucket) 64 { 65 if (list_empty(&bucket->committing) && list_empty(&bucket->written)) { 66 struct pnfs_layout_segment *freeme = bucket->lseg; 67 bucket->lseg = NULL; 68 return freeme; 69 } 70 return NULL; 71 } 72 73 /* The generic layer is about to remove the req from the commit list. 74 * If this will make the bucket empty, it will need to put the lseg reference. 75 * Note this must be called holding nfsi->commit_mutex 76 */ 77 void 78 pnfs_generic_clear_request_commit(struct nfs_page *req, 79 struct nfs_commit_info *cinfo) 80 { 81 struct pnfs_layout_segment *freeme = NULL; 82 83 if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags)) 84 goto out; 85 cinfo->ds->nwritten--; 86 if (list_is_singular(&req->wb_list)) { 87 struct pnfs_commit_bucket *bucket; 88 89 bucket = list_first_entry(&req->wb_list, 90 struct pnfs_commit_bucket, 91 written); 92 freeme = pnfs_free_bucket_lseg(bucket); 93 } 94 out: 95 nfs_request_remove_commit_list(req, cinfo); 96 pnfs_put_lseg(freeme); 97 } 98 EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit); 99 100 struct pnfs_commit_array * 101 pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags) 102 { 103 struct pnfs_commit_array *p; 104 struct pnfs_commit_bucket *b; 105 106 p = kmalloc(struct_size(p, buckets, n), gfp_flags); 107 if (!p) 108 return NULL; 109 p->nbuckets = n; 110 INIT_LIST_HEAD(&p->cinfo_list); 111 INIT_LIST_HEAD(&p->lseg_list); 112 p->lseg = NULL; 113 for (b = &p->buckets[0]; n != 0; b++, n--) { 114 INIT_LIST_HEAD(&b->written); 115 INIT_LIST_HEAD(&b->committing); 116 b->lseg = NULL; 117 b->direct_verf.committed = NFS_INVALID_STABLE_HOW; 118 } 119 return p; 120 } 121 EXPORT_SYMBOL_GPL(pnfs_alloc_commit_array); 122 123 void 124 pnfs_free_commit_array(struct pnfs_commit_array *p) 125 { 126 kfree_rcu(p, rcu); 127 } 128 EXPORT_SYMBOL_GPL(pnfs_free_commit_array); 129 130 static struct pnfs_commit_array * 131 pnfs_find_commit_array_by_lseg(struct pnfs_ds_commit_info *fl_cinfo, 132 struct pnfs_layout_segment *lseg) 133 { 134 struct pnfs_commit_array *array; 135 136 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { 137 if (array->lseg == lseg) 138 return array; 139 } 140 return NULL; 141 } 142 143 struct pnfs_commit_array * 144 pnfs_add_commit_array(struct pnfs_ds_commit_info *fl_cinfo, 145 struct pnfs_commit_array *new, 146 struct pnfs_layout_segment *lseg) 147 { 148 struct pnfs_commit_array *array; 149 150 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg); 151 if (array) 152 return array; 153 new->lseg = lseg; 154 refcount_set(&new->refcount, 1); 155 list_add_rcu(&new->cinfo_list, &fl_cinfo->commits); 156 list_add(&new->lseg_list, &lseg->pls_commits); 157 return new; 158 } 159 EXPORT_SYMBOL_GPL(pnfs_add_commit_array); 160 161 static struct pnfs_commit_array * 162 pnfs_lookup_commit_array(struct pnfs_ds_commit_info *fl_cinfo, 163 struct pnfs_layout_segment *lseg) 164 { 165 struct pnfs_commit_array *array; 166 167 rcu_read_lock(); 168 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg); 169 if (!array) { 170 rcu_read_unlock(); 171 fl_cinfo->ops->setup_ds_info(fl_cinfo, lseg); 172 rcu_read_lock(); 173 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg); 174 } 175 rcu_read_unlock(); 176 return array; 177 } 178 179 static void 180 pnfs_release_commit_array_locked(struct pnfs_commit_array *array) 181 { 182 list_del_rcu(&array->cinfo_list); 183 list_del(&array->lseg_list); 184 pnfs_free_commit_array(array); 185 } 186 187 static void 188 pnfs_put_commit_array_locked(struct pnfs_commit_array *array) 189 { 190 if (refcount_dec_and_test(&array->refcount)) 191 pnfs_release_commit_array_locked(array); 192 } 193 194 static void 195 pnfs_put_commit_array(struct pnfs_commit_array *array, struct inode *inode) 196 { 197 if (refcount_dec_and_lock(&array->refcount, &inode->i_lock)) { 198 pnfs_release_commit_array_locked(array); 199 spin_unlock(&inode->i_lock); 200 } 201 } 202 203 static struct pnfs_commit_array * 204 pnfs_get_commit_array(struct pnfs_commit_array *array) 205 { 206 if (refcount_inc_not_zero(&array->refcount)) 207 return array; 208 return NULL; 209 } 210 211 static void 212 pnfs_remove_and_free_commit_array(struct pnfs_commit_array *array) 213 { 214 array->lseg = NULL; 215 list_del_init(&array->lseg_list); 216 pnfs_put_commit_array_locked(array); 217 } 218 219 void 220 pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo, 221 struct pnfs_layout_segment *lseg) 222 { 223 struct pnfs_commit_array *array, *tmp; 224 225 list_for_each_entry_safe(array, tmp, &lseg->pls_commits, lseg_list) 226 pnfs_remove_and_free_commit_array(array); 227 } 228 EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_release_lseg); 229 230 void 231 pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo) 232 { 233 struct pnfs_commit_array *array, *tmp; 234 235 list_for_each_entry_safe(array, tmp, &fl_cinfo->commits, cinfo_list) 236 pnfs_remove_and_free_commit_array(array); 237 } 238 EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_destroy); 239 240 /* 241 * Locks the nfs_page requests for commit and moves them to 242 * @bucket->committing. 243 */ 244 static int 245 pnfs_bucket_scan_ds_commit_list(struct pnfs_commit_bucket *bucket, 246 struct nfs_commit_info *cinfo, 247 int max) 248 { 249 struct list_head *src = &bucket->written; 250 struct list_head *dst = &bucket->committing; 251 int ret; 252 253 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); 254 ret = nfs_scan_commit_list(src, dst, cinfo, max); 255 if (ret) { 256 cinfo->ds->nwritten -= ret; 257 cinfo->ds->ncommitting += ret; 258 } 259 return ret; 260 } 261 262 static int pnfs_bucket_scan_array(struct nfs_commit_info *cinfo, 263 struct pnfs_commit_bucket *buckets, 264 unsigned int nbuckets, 265 int max) 266 { 267 unsigned int i; 268 int rv = 0, cnt; 269 270 for (i = 0; i < nbuckets && max != 0; i++) { 271 cnt = pnfs_bucket_scan_ds_commit_list(&buckets[i], cinfo, max); 272 rv += cnt; 273 max -= cnt; 274 } 275 return rv; 276 } 277 278 /* Move reqs from written to committing lists, returning count 279 * of number moved. 280 */ 281 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max) 282 { 283 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 284 struct pnfs_commit_array *array; 285 int rv = 0, cnt; 286 287 rcu_read_lock(); 288 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { 289 if (!array->lseg || !pnfs_get_commit_array(array)) 290 continue; 291 rcu_read_unlock(); 292 cnt = pnfs_bucket_scan_array(cinfo, array->buckets, 293 array->nbuckets, max); 294 rcu_read_lock(); 295 pnfs_put_commit_array(array, cinfo->inode); 296 rv += cnt; 297 max -= cnt; 298 if (!max) 299 break; 300 } 301 rcu_read_unlock(); 302 return rv; 303 } 304 EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists); 305 306 static unsigned int 307 pnfs_bucket_recover_commit_reqs(struct list_head *dst, 308 struct pnfs_commit_bucket *buckets, 309 unsigned int nbuckets, 310 struct nfs_commit_info *cinfo) 311 { 312 struct pnfs_commit_bucket *b; 313 struct pnfs_layout_segment *freeme; 314 unsigned int nwritten, ret = 0; 315 unsigned int i; 316 317 restart: 318 for (i = 0, b = buckets; i < nbuckets; i++, b++) { 319 nwritten = nfs_scan_commit_list(&b->written, dst, cinfo, 0); 320 if (!nwritten) 321 continue; 322 ret += nwritten; 323 freeme = pnfs_free_bucket_lseg(b); 324 if (freeme) { 325 pnfs_put_lseg(freeme); 326 goto restart; 327 } 328 } 329 return ret; 330 } 331 332 /* Pull everything off the committing lists and dump into @dst. */ 333 void pnfs_generic_recover_commit_reqs(struct list_head *dst, 334 struct nfs_commit_info *cinfo) 335 { 336 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 337 struct pnfs_commit_array *array; 338 unsigned int nwritten; 339 340 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); 341 rcu_read_lock(); 342 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { 343 if (!array->lseg || !pnfs_get_commit_array(array)) 344 continue; 345 rcu_read_unlock(); 346 nwritten = pnfs_bucket_recover_commit_reqs(dst, 347 array->buckets, 348 array->nbuckets, 349 cinfo); 350 rcu_read_lock(); 351 pnfs_put_commit_array(array, cinfo->inode); 352 fl_cinfo->nwritten -= nwritten; 353 } 354 rcu_read_unlock(); 355 } 356 EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs); 357 358 static struct nfs_page * 359 pnfs_bucket_search_commit_reqs(struct pnfs_commit_bucket *buckets, 360 unsigned int nbuckets, struct page *page) 361 { 362 struct nfs_page *req; 363 struct pnfs_commit_bucket *b; 364 unsigned int i; 365 366 /* Linearly search the commit lists for each bucket until a matching 367 * request is found */ 368 for (i = 0, b = buckets; i < nbuckets; i++, b++) { 369 list_for_each_entry(req, &b->written, wb_list) { 370 if (req->wb_page == page) 371 return req->wb_head; 372 } 373 list_for_each_entry(req, &b->committing, wb_list) { 374 if (req->wb_page == page) 375 return req->wb_head; 376 } 377 } 378 return NULL; 379 } 380 381 /* pnfs_generic_search_commit_reqs - Search lists in @cinfo for the head reqest 382 * for @page 383 * @cinfo - commit info for current inode 384 * @page - page to search for matching head request 385 * 386 * Returns a the head request if one is found, otherwise returns NULL. 387 */ 388 struct nfs_page * 389 pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page) 390 { 391 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 392 struct pnfs_commit_array *array; 393 struct nfs_page *req; 394 395 list_for_each_entry(array, &fl_cinfo->commits, cinfo_list) { 396 req = pnfs_bucket_search_commit_reqs(array->buckets, 397 array->nbuckets, page); 398 if (req) 399 return req; 400 } 401 return NULL; 402 } 403 EXPORT_SYMBOL_GPL(pnfs_generic_search_commit_reqs); 404 405 static struct pnfs_layout_segment * 406 pnfs_bucket_get_committing(struct list_head *head, 407 struct pnfs_commit_bucket *bucket, 408 struct nfs_commit_info *cinfo) 409 { 410 struct list_head *pos; 411 412 list_for_each(pos, &bucket->committing) 413 cinfo->ds->ncommitting--; 414 list_splice_init(&bucket->committing, head); 415 return pnfs_free_bucket_lseg(bucket); 416 } 417 418 static struct nfs_commit_data * 419 pnfs_bucket_fetch_commitdata(struct pnfs_commit_bucket *bucket, 420 struct nfs_commit_info *cinfo) 421 { 422 struct nfs_commit_data *data = nfs_commitdata_alloc(false); 423 424 if (!data) 425 return NULL; 426 data->lseg = pnfs_bucket_get_committing(&data->pages, bucket, cinfo); 427 if (!data->lseg) 428 data->lseg = pnfs_get_lseg(bucket->lseg); 429 return data; 430 } 431 432 static void pnfs_generic_retry_commit(struct pnfs_commit_bucket *buckets, 433 unsigned int nbuckets, 434 struct nfs_commit_info *cinfo, 435 unsigned int idx) 436 { 437 struct pnfs_commit_bucket *bucket; 438 struct pnfs_layout_segment *freeme; 439 LIST_HEAD(pages); 440 441 for (bucket = buckets; idx < nbuckets; bucket++, idx++) { 442 if (list_empty(&bucket->committing)) 443 continue; 444 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 445 freeme = pnfs_bucket_get_committing(&pages, bucket, cinfo); 446 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 447 nfs_retry_commit(&pages, freeme, cinfo, idx); 448 pnfs_put_lseg(freeme); 449 } 450 } 451 452 static unsigned int 453 pnfs_bucket_alloc_ds_commits(struct list_head *list, 454 struct pnfs_commit_bucket *buckets, 455 unsigned int nbuckets, 456 struct nfs_commit_info *cinfo) 457 { 458 struct pnfs_commit_bucket *bucket; 459 struct nfs_commit_data *data; 460 unsigned int i; 461 unsigned int nreq = 0; 462 463 for (i = 0, bucket = buckets; i < nbuckets; i++, bucket++) { 464 if (list_empty(&bucket->committing)) 465 continue; 466 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 467 if (!list_empty(&bucket->committing)) { 468 data = pnfs_bucket_fetch_commitdata(bucket, cinfo); 469 if (!data) 470 goto out_error; 471 data->ds_commit_index = i; 472 list_add_tail(&data->list, list); 473 atomic_inc(&cinfo->mds->rpcs_out); 474 nreq++; 475 } 476 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 477 } 478 return nreq; 479 out_error: 480 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 481 /* Clean up on error */ 482 pnfs_generic_retry_commit(buckets, nbuckets, cinfo, i); 483 return nreq; 484 } 485 486 static unsigned int 487 pnfs_alloc_ds_commits_list(struct list_head *list, 488 struct pnfs_ds_commit_info *fl_cinfo, 489 struct nfs_commit_info *cinfo) 490 { 491 struct pnfs_commit_array *array; 492 unsigned int ret = 0; 493 494 rcu_read_lock(); 495 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { 496 if (!array->lseg || !pnfs_get_commit_array(array)) 497 continue; 498 rcu_read_unlock(); 499 ret += pnfs_bucket_alloc_ds_commits(list, array->buckets, 500 array->nbuckets, cinfo); 501 rcu_read_lock(); 502 pnfs_put_commit_array(array, cinfo->inode); 503 } 504 rcu_read_unlock(); 505 return ret; 506 } 507 508 /* This follows nfs_commit_list pretty closely */ 509 int 510 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 511 int how, struct nfs_commit_info *cinfo, 512 int (*initiate_commit)(struct nfs_commit_data *data, 513 int how)) 514 { 515 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 516 struct nfs_commit_data *data, *tmp; 517 LIST_HEAD(list); 518 unsigned int nreq = 0; 519 520 if (!list_empty(mds_pages)) { 521 data = nfs_commitdata_alloc(true); 522 data->ds_commit_index = -1; 523 list_splice_init(mds_pages, &data->pages); 524 list_add_tail(&data->list, &list); 525 atomic_inc(&cinfo->mds->rpcs_out); 526 nreq++; 527 } 528 529 nreq += pnfs_alloc_ds_commits_list(&list, fl_cinfo, cinfo); 530 if (nreq == 0) 531 goto out; 532 533 list_for_each_entry_safe(data, tmp, &list, list) { 534 list_del(&data->list); 535 if (data->ds_commit_index < 0) { 536 nfs_init_commit(data, NULL, NULL, cinfo); 537 nfs_initiate_commit(NFS_CLIENT(inode), data, 538 NFS_PROTO(data->inode), 539 data->mds_ops, how, 540 RPC_TASK_CRED_NOREF); 541 } else { 542 nfs_init_commit(data, NULL, data->lseg, cinfo); 543 initiate_commit(data, how); 544 } 545 } 546 out: 547 return PNFS_ATTEMPTED; 548 } 549 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); 550 551 /* 552 * Data server cache 553 * 554 * Data servers can be mapped to different device ids. 555 * nfs4_pnfs_ds reference counting 556 * - set to 1 on allocation 557 * - incremented when a device id maps a data server already in the cache. 558 * - decremented when deviceid is removed from the cache. 559 */ 560 static DEFINE_SPINLOCK(nfs4_ds_cache_lock); 561 static LIST_HEAD(nfs4_data_server_cache); 562 563 /* Debug routines */ 564 static void 565 print_ds(struct nfs4_pnfs_ds *ds) 566 { 567 if (ds == NULL) { 568 printk(KERN_WARNING "%s NULL device\n", __func__); 569 return; 570 } 571 printk(KERN_WARNING " ds %s\n" 572 " ref count %d\n" 573 " client %p\n" 574 " cl_exchange_flags %x\n", 575 ds->ds_remotestr, 576 refcount_read(&ds->ds_count), ds->ds_clp, 577 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); 578 } 579 580 static bool 581 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) 582 { 583 struct sockaddr_in *a, *b; 584 struct sockaddr_in6 *a6, *b6; 585 586 if (addr1->sa_family != addr2->sa_family) 587 return false; 588 589 switch (addr1->sa_family) { 590 case AF_INET: 591 a = (struct sockaddr_in *)addr1; 592 b = (struct sockaddr_in *)addr2; 593 594 if (a->sin_addr.s_addr == b->sin_addr.s_addr && 595 a->sin_port == b->sin_port) 596 return true; 597 break; 598 599 case AF_INET6: 600 a6 = (struct sockaddr_in6 *)addr1; 601 b6 = (struct sockaddr_in6 *)addr2; 602 603 /* LINKLOCAL addresses must have matching scope_id */ 604 if (ipv6_addr_src_scope(&a6->sin6_addr) == 605 IPV6_ADDR_SCOPE_LINKLOCAL && 606 a6->sin6_scope_id != b6->sin6_scope_id) 607 return false; 608 609 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && 610 a6->sin6_port == b6->sin6_port) 611 return true; 612 break; 613 614 default: 615 dprintk("%s: unhandled address family: %u\n", 616 __func__, addr1->sa_family); 617 return false; 618 } 619 620 return false; 621 } 622 623 /* 624 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, 625 * declare a match. 626 */ 627 static bool 628 _same_data_server_addrs_locked(const struct list_head *dsaddrs1, 629 const struct list_head *dsaddrs2) 630 { 631 struct nfs4_pnfs_ds_addr *da1, *da2; 632 struct sockaddr *sa1, *sa2; 633 bool match = false; 634 635 list_for_each_entry(da1, dsaddrs1, da_node) { 636 sa1 = (struct sockaddr *)&da1->da_addr; 637 match = false; 638 list_for_each_entry(da2, dsaddrs2, da_node) { 639 sa2 = (struct sockaddr *)&da2->da_addr; 640 match = same_sockaddr(sa1, sa2); 641 if (match) 642 break; 643 } 644 if (!match) 645 break; 646 } 647 return match; 648 } 649 650 /* 651 * Lookup DS by addresses. nfs4_ds_cache_lock is held 652 */ 653 static struct nfs4_pnfs_ds * 654 _data_server_lookup_locked(const struct list_head *dsaddrs) 655 { 656 struct nfs4_pnfs_ds *ds; 657 658 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) 659 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) 660 return ds; 661 return NULL; 662 } 663 664 static void destroy_ds(struct nfs4_pnfs_ds *ds) 665 { 666 struct nfs4_pnfs_ds_addr *da; 667 668 dprintk("--> %s\n", __func__); 669 ifdebug(FACILITY) 670 print_ds(ds); 671 672 nfs_put_client(ds->ds_clp); 673 674 while (!list_empty(&ds->ds_addrs)) { 675 da = list_first_entry(&ds->ds_addrs, 676 struct nfs4_pnfs_ds_addr, 677 da_node); 678 list_del_init(&da->da_node); 679 kfree(da->da_remotestr); 680 kfree(da); 681 } 682 683 kfree(ds->ds_remotestr); 684 kfree(ds); 685 } 686 687 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) 688 { 689 if (refcount_dec_and_lock(&ds->ds_count, 690 &nfs4_ds_cache_lock)) { 691 list_del_init(&ds->ds_node); 692 spin_unlock(&nfs4_ds_cache_lock); 693 destroy_ds(ds); 694 } 695 } 696 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); 697 698 /* 699 * Create a string with a human readable address and port to avoid 700 * complicated setup around many dprinks. 701 */ 702 static char * 703 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) 704 { 705 struct nfs4_pnfs_ds_addr *da; 706 char *remotestr; 707 size_t len; 708 char *p; 709 710 len = 3; /* '{', '}' and eol */ 711 list_for_each_entry(da, dsaddrs, da_node) { 712 len += strlen(da->da_remotestr) + 1; /* string plus comma */ 713 } 714 715 remotestr = kzalloc(len, gfp_flags); 716 if (!remotestr) 717 return NULL; 718 719 p = remotestr; 720 *(p++) = '{'; 721 len--; 722 list_for_each_entry(da, dsaddrs, da_node) { 723 size_t ll = strlen(da->da_remotestr); 724 725 if (ll > len) 726 goto out_err; 727 728 memcpy(p, da->da_remotestr, ll); 729 p += ll; 730 len -= ll; 731 732 if (len < 1) 733 goto out_err; 734 (*p++) = ','; 735 len--; 736 } 737 if (len < 2) 738 goto out_err; 739 *(p++) = '}'; 740 *p = '\0'; 741 return remotestr; 742 out_err: 743 kfree(remotestr); 744 return NULL; 745 } 746 747 /* 748 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if 749 * uncached and return cached struct nfs4_pnfs_ds. 750 */ 751 struct nfs4_pnfs_ds * 752 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) 753 { 754 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; 755 char *remotestr; 756 757 if (list_empty(dsaddrs)) { 758 dprintk("%s: no addresses defined\n", __func__); 759 goto out; 760 } 761 762 ds = kzalloc(sizeof(*ds), gfp_flags); 763 if (!ds) 764 goto out; 765 766 /* this is only used for debugging, so it's ok if its NULL */ 767 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); 768 769 spin_lock(&nfs4_ds_cache_lock); 770 tmp_ds = _data_server_lookup_locked(dsaddrs); 771 if (tmp_ds == NULL) { 772 INIT_LIST_HEAD(&ds->ds_addrs); 773 list_splice_init(dsaddrs, &ds->ds_addrs); 774 ds->ds_remotestr = remotestr; 775 refcount_set(&ds->ds_count, 1); 776 INIT_LIST_HEAD(&ds->ds_node); 777 ds->ds_clp = NULL; 778 list_add(&ds->ds_node, &nfs4_data_server_cache); 779 dprintk("%s add new data server %s\n", __func__, 780 ds->ds_remotestr); 781 } else { 782 kfree(remotestr); 783 kfree(ds); 784 refcount_inc(&tmp_ds->ds_count); 785 dprintk("%s data server %s found, inc'ed ds_count to %d\n", 786 __func__, tmp_ds->ds_remotestr, 787 refcount_read(&tmp_ds->ds_count)); 788 ds = tmp_ds; 789 } 790 spin_unlock(&nfs4_ds_cache_lock); 791 out: 792 return ds; 793 } 794 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); 795 796 static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) 797 { 798 might_sleep(); 799 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, 800 TASK_KILLABLE); 801 } 802 803 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) 804 { 805 smp_mb__before_atomic(); 806 clear_bit(NFS4DS_CONNECTING, &ds->ds_state); 807 smp_mb__after_atomic(); 808 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); 809 } 810 811 static struct nfs_client *(*get_v3_ds_connect)( 812 struct nfs_server *mds_srv, 813 const struct sockaddr *ds_addr, 814 int ds_addrlen, 815 int ds_proto, 816 unsigned int ds_timeo, 817 unsigned int ds_retrans); 818 819 static bool load_v3_ds_connect(void) 820 { 821 if (!get_v3_ds_connect) { 822 get_v3_ds_connect = symbol_request(nfs3_set_ds_client); 823 WARN_ON_ONCE(!get_v3_ds_connect); 824 } 825 826 return(get_v3_ds_connect != NULL); 827 } 828 829 void nfs4_pnfs_v3_ds_connect_unload(void) 830 { 831 if (get_v3_ds_connect) { 832 symbol_put(nfs3_set_ds_client); 833 get_v3_ds_connect = NULL; 834 } 835 } 836 837 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, 838 struct nfs4_pnfs_ds *ds, 839 unsigned int timeo, 840 unsigned int retrans) 841 { 842 struct nfs_client *clp = ERR_PTR(-EIO); 843 struct nfs4_pnfs_ds_addr *da; 844 int status = 0; 845 846 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); 847 848 if (!load_v3_ds_connect()) 849 goto out; 850 851 list_for_each_entry(da, &ds->ds_addrs, da_node) { 852 dprintk("%s: DS %s: trying address %s\n", 853 __func__, ds->ds_remotestr, da->da_remotestr); 854 855 if (!IS_ERR(clp)) { 856 struct xprt_create xprt_args = { 857 .ident = XPRT_TRANSPORT_TCP, 858 .net = clp->cl_net, 859 .dstaddr = (struct sockaddr *)&da->da_addr, 860 .addrlen = da->da_addrlen, 861 .servername = clp->cl_hostname, 862 }; 863 /* Add this address as an alias */ 864 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 865 rpc_clnt_test_and_add_xprt, NULL); 866 continue; 867 } 868 clp = get_v3_ds_connect(mds_srv, 869 (struct sockaddr *)&da->da_addr, 870 da->da_addrlen, IPPROTO_TCP, 871 timeo, retrans); 872 if (IS_ERR(clp)) 873 continue; 874 clp->cl_rpcclient->cl_softerr = 0; 875 clp->cl_rpcclient->cl_softrtry = 0; 876 } 877 878 if (IS_ERR(clp)) { 879 status = PTR_ERR(clp); 880 goto out; 881 } 882 883 smp_wmb(); 884 ds->ds_clp = clp; 885 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 886 out: 887 return status; 888 } 889 890 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, 891 struct nfs4_pnfs_ds *ds, 892 unsigned int timeo, 893 unsigned int retrans, 894 u32 minor_version) 895 { 896 struct nfs_client *clp = ERR_PTR(-EIO); 897 struct nfs4_pnfs_ds_addr *da; 898 int status = 0; 899 900 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); 901 902 list_for_each_entry(da, &ds->ds_addrs, da_node) { 903 dprintk("%s: DS %s: trying address %s\n", 904 __func__, ds->ds_remotestr, da->da_remotestr); 905 906 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { 907 struct xprt_create xprt_args = { 908 .ident = XPRT_TRANSPORT_TCP, 909 .net = clp->cl_net, 910 .dstaddr = (struct sockaddr *)&da->da_addr, 911 .addrlen = da->da_addrlen, 912 .servername = clp->cl_hostname, 913 }; 914 struct nfs4_add_xprt_data xprtdata = { 915 .clp = clp, 916 .cred = nfs4_get_clid_cred(clp), 917 }; 918 struct rpc_add_xprt_test rpcdata = { 919 .add_xprt_test = clp->cl_mvops->session_trunk, 920 .data = &xprtdata, 921 }; 922 923 /** 924 * Test this address for session trunking and 925 * add as an alias 926 */ 927 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 928 rpc_clnt_setup_test_and_add_xprt, 929 &rpcdata); 930 if (xprtdata.cred) 931 put_cred(xprtdata.cred); 932 } else { 933 clp = nfs4_set_ds_client(mds_srv, 934 (struct sockaddr *)&da->da_addr, 935 da->da_addrlen, IPPROTO_TCP, 936 timeo, retrans, minor_version); 937 if (IS_ERR(clp)) 938 continue; 939 940 status = nfs4_init_ds_session(clp, 941 mds_srv->nfs_client->cl_lease_time); 942 if (status) { 943 nfs_put_client(clp); 944 clp = ERR_PTR(-EIO); 945 continue; 946 } 947 948 } 949 } 950 951 if (IS_ERR(clp)) { 952 status = PTR_ERR(clp); 953 goto out; 954 } 955 956 smp_wmb(); 957 ds->ds_clp = clp; 958 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 959 out: 960 return status; 961 } 962 963 /* 964 * Create an rpc connection to the nfs4_pnfs_ds data server. 965 * Currently only supports IPv4 and IPv6 addresses. 966 * If connection fails, make devid unavailable and return a -errno. 967 */ 968 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 969 struct nfs4_deviceid_node *devid, unsigned int timeo, 970 unsigned int retrans, u32 version, u32 minor_version) 971 { 972 int err; 973 974 again: 975 err = 0; 976 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { 977 if (version == 3) { 978 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, 979 retrans); 980 } else if (version == 4) { 981 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, 982 retrans, minor_version); 983 } else { 984 dprintk("%s: unsupported DS version %d\n", __func__, 985 version); 986 err = -EPROTONOSUPPORT; 987 } 988 989 nfs4_clear_ds_conn_bit(ds); 990 } else { 991 nfs4_wait_ds_connect(ds); 992 993 /* what was waited on didn't connect AND didn't mark unavail */ 994 if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid)) 995 goto again; 996 } 997 998 /* 999 * At this point the ds->ds_clp should be ready, but it might have 1000 * hit an error. 1001 */ 1002 if (!err) { 1003 if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) { 1004 WARN_ON_ONCE(ds->ds_clp || 1005 !nfs4_test_deviceid_unavailable(devid)); 1006 return -EINVAL; 1007 } 1008 err = nfs_client_init_status(ds->ds_clp); 1009 } 1010 1011 return err; 1012 } 1013 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); 1014 1015 /* 1016 * Currently only supports ipv4, ipv6 and one multi-path address. 1017 */ 1018 struct nfs4_pnfs_ds_addr * 1019 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) 1020 { 1021 struct nfs4_pnfs_ds_addr *da = NULL; 1022 char *buf, *portstr; 1023 __be16 port; 1024 int nlen, rlen; 1025 int tmp[2]; 1026 __be32 *p; 1027 char *netid, *match_netid; 1028 size_t len, match_netid_len; 1029 char *startsep = ""; 1030 char *endsep = ""; 1031 1032 1033 /* r_netid */ 1034 p = xdr_inline_decode(xdr, 4); 1035 if (unlikely(!p)) 1036 goto out_err; 1037 nlen = be32_to_cpup(p++); 1038 1039 p = xdr_inline_decode(xdr, nlen); 1040 if (unlikely(!p)) 1041 goto out_err; 1042 1043 netid = kmalloc(nlen+1, gfp_flags); 1044 if (unlikely(!netid)) 1045 goto out_err; 1046 1047 netid[nlen] = '\0'; 1048 memcpy(netid, p, nlen); 1049 1050 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ 1051 p = xdr_inline_decode(xdr, 4); 1052 if (unlikely(!p)) 1053 goto out_free_netid; 1054 rlen = be32_to_cpup(p); 1055 1056 p = xdr_inline_decode(xdr, rlen); 1057 if (unlikely(!p)) 1058 goto out_free_netid; 1059 1060 /* port is ".ABC.DEF", 8 chars max */ 1061 if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { 1062 dprintk("%s: Invalid address, length %d\n", __func__, 1063 rlen); 1064 goto out_free_netid; 1065 } 1066 buf = kmalloc(rlen + 1, gfp_flags); 1067 if (!buf) { 1068 dprintk("%s: Not enough memory\n", __func__); 1069 goto out_free_netid; 1070 } 1071 buf[rlen] = '\0'; 1072 memcpy(buf, p, rlen); 1073 1074 /* replace port '.' with '-' */ 1075 portstr = strrchr(buf, '.'); 1076 if (!portstr) { 1077 dprintk("%s: Failed finding expected dot in port\n", 1078 __func__); 1079 goto out_free_buf; 1080 } 1081 *portstr = '-'; 1082 1083 /* find '.' between address and port */ 1084 portstr = strrchr(buf, '.'); 1085 if (!portstr) { 1086 dprintk("%s: Failed finding expected dot between address and " 1087 "port\n", __func__); 1088 goto out_free_buf; 1089 } 1090 *portstr = '\0'; 1091 1092 da = kzalloc(sizeof(*da), gfp_flags); 1093 if (unlikely(!da)) 1094 goto out_free_buf; 1095 1096 INIT_LIST_HEAD(&da->da_node); 1097 1098 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, 1099 sizeof(da->da_addr))) { 1100 dprintk("%s: error parsing address %s\n", __func__, buf); 1101 goto out_free_da; 1102 } 1103 1104 portstr++; 1105 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); 1106 port = htons((tmp[0] << 8) | (tmp[1])); 1107 1108 switch (da->da_addr.ss_family) { 1109 case AF_INET: 1110 ((struct sockaddr_in *)&da->da_addr)->sin_port = port; 1111 da->da_addrlen = sizeof(struct sockaddr_in); 1112 match_netid = "tcp"; 1113 match_netid_len = 3; 1114 break; 1115 1116 case AF_INET6: 1117 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; 1118 da->da_addrlen = sizeof(struct sockaddr_in6); 1119 match_netid = "tcp6"; 1120 match_netid_len = 4; 1121 startsep = "["; 1122 endsep = "]"; 1123 break; 1124 1125 default: 1126 dprintk("%s: unsupported address family: %u\n", 1127 __func__, da->da_addr.ss_family); 1128 goto out_free_da; 1129 } 1130 1131 if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { 1132 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", 1133 __func__, netid, match_netid); 1134 goto out_free_da; 1135 } 1136 1137 /* save human readable address */ 1138 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; 1139 da->da_remotestr = kzalloc(len, gfp_flags); 1140 1141 /* NULL is ok, only used for dprintk */ 1142 if (da->da_remotestr) 1143 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, 1144 buf, endsep, ntohs(port)); 1145 1146 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); 1147 kfree(buf); 1148 kfree(netid); 1149 return da; 1150 1151 out_free_da: 1152 kfree(da); 1153 out_free_buf: 1154 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); 1155 kfree(buf); 1156 out_free_netid: 1157 kfree(netid); 1158 out_err: 1159 return NULL; 1160 } 1161 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); 1162 1163 void 1164 pnfs_layout_mark_request_commit(struct nfs_page *req, 1165 struct pnfs_layout_segment *lseg, 1166 struct nfs_commit_info *cinfo, 1167 u32 ds_commit_idx) 1168 { 1169 struct list_head *list; 1170 struct pnfs_commit_array *array; 1171 struct pnfs_commit_bucket *bucket; 1172 1173 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 1174 array = pnfs_lookup_commit_array(cinfo->ds, lseg); 1175 if (!array || !pnfs_is_valid_lseg(lseg)) 1176 goto out_resched; 1177 bucket = &array->buckets[ds_commit_idx]; 1178 list = &bucket->written; 1179 /* Non-empty buckets hold a reference on the lseg. That ref 1180 * is normally transferred to the COMMIT call and released 1181 * there. It could also be released if the last req is pulled 1182 * off due to a rewrite, in which case it will be done in 1183 * pnfs_common_clear_request_commit 1184 */ 1185 if (!bucket->lseg) 1186 bucket->lseg = pnfs_get_lseg(lseg); 1187 set_bit(PG_COMMIT_TO_DS, &req->wb_flags); 1188 cinfo->ds->nwritten++; 1189 1190 nfs_request_add_commit_list_locked(req, list, cinfo); 1191 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1192 nfs_mark_page_unstable(req->wb_page, cinfo); 1193 return; 1194 out_resched: 1195 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1196 cinfo->completion_ops->resched_write(cinfo, req); 1197 } 1198 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); 1199 1200 int 1201 pnfs_nfs_generic_sync(struct inode *inode, bool datasync) 1202 { 1203 int ret; 1204 1205 if (!pnfs_layoutcommit_outstanding(inode)) 1206 return 0; 1207 ret = nfs_commit_inode(inode, FLUSH_SYNC); 1208 if (ret < 0) 1209 return ret; 1210 if (datasync) 1211 return 0; 1212 return pnfs_layoutcommit_inode(inode, true); 1213 } 1214 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); 1215 1216