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_commit_bucket *bucket = 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 bucket = list_first_entry(&req->wb_list, 88 struct pnfs_commit_bucket, written); 89 out: 90 nfs_request_remove_commit_list(req, cinfo); 91 if (bucket) 92 pnfs_put_lseg(pnfs_free_bucket_lseg(bucket)); 93 } 94 EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit); 95 96 struct pnfs_commit_array * 97 pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags) 98 { 99 struct pnfs_commit_array *p; 100 struct pnfs_commit_bucket *b; 101 102 p = kmalloc(struct_size(p, buckets, n), gfp_flags); 103 if (!p) 104 return NULL; 105 p->nbuckets = n; 106 INIT_LIST_HEAD(&p->cinfo_list); 107 INIT_LIST_HEAD(&p->lseg_list); 108 p->lseg = NULL; 109 for (b = &p->buckets[0]; n != 0; b++, n--) { 110 INIT_LIST_HEAD(&b->written); 111 INIT_LIST_HEAD(&b->committing); 112 b->lseg = NULL; 113 b->direct_verf.committed = NFS_INVALID_STABLE_HOW; 114 } 115 return p; 116 } 117 EXPORT_SYMBOL_GPL(pnfs_alloc_commit_array); 118 119 void 120 pnfs_free_commit_array(struct pnfs_commit_array *p) 121 { 122 kfree_rcu(p, rcu); 123 } 124 EXPORT_SYMBOL_GPL(pnfs_free_commit_array); 125 126 static struct pnfs_commit_array * 127 pnfs_find_commit_array_by_lseg(struct pnfs_ds_commit_info *fl_cinfo, 128 struct pnfs_layout_segment *lseg) 129 { 130 struct pnfs_commit_array *array; 131 132 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { 133 if (array->lseg == lseg) 134 return array; 135 } 136 return NULL; 137 } 138 139 struct pnfs_commit_array * 140 pnfs_add_commit_array(struct pnfs_ds_commit_info *fl_cinfo, 141 struct pnfs_commit_array *new, 142 struct pnfs_layout_segment *lseg) 143 { 144 struct pnfs_commit_array *array; 145 146 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg); 147 if (array) 148 return array; 149 new->lseg = lseg; 150 refcount_set(&new->refcount, 1); 151 list_add_rcu(&new->cinfo_list, &fl_cinfo->commits); 152 list_add(&new->lseg_list, &lseg->pls_commits); 153 return new; 154 } 155 EXPORT_SYMBOL_GPL(pnfs_add_commit_array); 156 157 static struct pnfs_commit_array * 158 pnfs_lookup_commit_array(struct pnfs_ds_commit_info *fl_cinfo, 159 struct pnfs_layout_segment *lseg) 160 { 161 struct pnfs_commit_array *array; 162 163 rcu_read_lock(); 164 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg); 165 if (!array) { 166 rcu_read_unlock(); 167 fl_cinfo->ops->setup_ds_info(fl_cinfo, lseg); 168 rcu_read_lock(); 169 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg); 170 } 171 rcu_read_unlock(); 172 return array; 173 } 174 175 static void 176 pnfs_release_commit_array_locked(struct pnfs_commit_array *array) 177 { 178 list_del_rcu(&array->cinfo_list); 179 list_del(&array->lseg_list); 180 pnfs_free_commit_array(array); 181 } 182 183 static void 184 pnfs_put_commit_array_locked(struct pnfs_commit_array *array) 185 { 186 if (refcount_dec_and_test(&array->refcount)) 187 pnfs_release_commit_array_locked(array); 188 } 189 190 static void 191 pnfs_put_commit_array(struct pnfs_commit_array *array, struct inode *inode) 192 { 193 if (refcount_dec_and_lock(&array->refcount, &inode->i_lock)) { 194 pnfs_release_commit_array_locked(array); 195 spin_unlock(&inode->i_lock); 196 } 197 } 198 199 static struct pnfs_commit_array * 200 pnfs_get_commit_array(struct pnfs_commit_array *array) 201 { 202 if (refcount_inc_not_zero(&array->refcount)) 203 return array; 204 return NULL; 205 } 206 207 static void 208 pnfs_remove_and_free_commit_array(struct pnfs_commit_array *array) 209 { 210 array->lseg = NULL; 211 list_del_init(&array->lseg_list); 212 pnfs_put_commit_array_locked(array); 213 } 214 215 void 216 pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo, 217 struct pnfs_layout_segment *lseg) 218 { 219 struct pnfs_commit_array *array, *tmp; 220 221 list_for_each_entry_safe(array, tmp, &lseg->pls_commits, lseg_list) 222 pnfs_remove_and_free_commit_array(array); 223 } 224 EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_release_lseg); 225 226 void 227 pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo) 228 { 229 struct pnfs_commit_array *array, *tmp; 230 231 list_for_each_entry_safe(array, tmp, &fl_cinfo->commits, cinfo_list) 232 pnfs_remove_and_free_commit_array(array); 233 } 234 EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_destroy); 235 236 /* 237 * Locks the nfs_page requests for commit and moves them to 238 * @bucket->committing. 239 */ 240 static int 241 pnfs_bucket_scan_ds_commit_list(struct pnfs_commit_bucket *bucket, 242 struct nfs_commit_info *cinfo, 243 int max) 244 { 245 struct list_head *src = &bucket->written; 246 struct list_head *dst = &bucket->committing; 247 int ret; 248 249 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); 250 ret = nfs_scan_commit_list(src, dst, cinfo, max); 251 if (ret) { 252 cinfo->ds->nwritten -= ret; 253 cinfo->ds->ncommitting += ret; 254 } 255 return ret; 256 } 257 258 static int pnfs_bucket_scan_array(struct nfs_commit_info *cinfo, 259 struct pnfs_commit_bucket *buckets, 260 unsigned int nbuckets, 261 int max) 262 { 263 unsigned int i; 264 int rv = 0, cnt; 265 266 for (i = 0; i < nbuckets && max != 0; i++) { 267 cnt = pnfs_bucket_scan_ds_commit_list(&buckets[i], cinfo, max); 268 rv += cnt; 269 max -= cnt; 270 } 271 return rv; 272 } 273 274 /* Move reqs from written to committing lists, returning count 275 * of number moved. 276 */ 277 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max) 278 { 279 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 280 struct pnfs_commit_array *array; 281 int rv = 0, cnt; 282 283 rcu_read_lock(); 284 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { 285 if (!array->lseg || !pnfs_get_commit_array(array)) 286 continue; 287 rcu_read_unlock(); 288 cnt = pnfs_bucket_scan_array(cinfo, array->buckets, 289 array->nbuckets, max); 290 rcu_read_lock(); 291 pnfs_put_commit_array(array, cinfo->inode); 292 rv += cnt; 293 max -= cnt; 294 if (!max) 295 break; 296 } 297 rcu_read_unlock(); 298 return rv; 299 } 300 EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists); 301 302 static unsigned int 303 pnfs_bucket_recover_commit_reqs(struct list_head *dst, 304 struct pnfs_commit_bucket *buckets, 305 unsigned int nbuckets, 306 struct nfs_commit_info *cinfo) 307 { 308 struct pnfs_commit_bucket *b; 309 struct pnfs_layout_segment *freeme; 310 unsigned int nwritten, ret = 0; 311 unsigned int i; 312 313 restart: 314 for (i = 0, b = buckets; i < nbuckets; i++, b++) { 315 nwritten = nfs_scan_commit_list(&b->written, dst, cinfo, 0); 316 if (!nwritten) 317 continue; 318 ret += nwritten; 319 freeme = pnfs_free_bucket_lseg(b); 320 if (freeme) { 321 pnfs_put_lseg(freeme); 322 goto restart; 323 } 324 } 325 return ret; 326 } 327 328 /* Pull everything off the committing lists and dump into @dst. */ 329 void pnfs_generic_recover_commit_reqs(struct list_head *dst, 330 struct nfs_commit_info *cinfo) 331 { 332 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 333 struct pnfs_commit_array *array; 334 unsigned int nwritten; 335 336 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); 337 rcu_read_lock(); 338 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { 339 if (!array->lseg || !pnfs_get_commit_array(array)) 340 continue; 341 rcu_read_unlock(); 342 nwritten = pnfs_bucket_recover_commit_reqs(dst, 343 array->buckets, 344 array->nbuckets, 345 cinfo); 346 rcu_read_lock(); 347 pnfs_put_commit_array(array, cinfo->inode); 348 fl_cinfo->nwritten -= nwritten; 349 } 350 rcu_read_unlock(); 351 } 352 EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs); 353 354 static struct nfs_page * 355 pnfs_bucket_search_commit_reqs(struct pnfs_commit_bucket *buckets, 356 unsigned int nbuckets, struct page *page) 357 { 358 struct nfs_page *req; 359 struct pnfs_commit_bucket *b; 360 unsigned int i; 361 362 /* Linearly search the commit lists for each bucket until a matching 363 * request is found */ 364 for (i = 0, b = buckets; i < nbuckets; i++, b++) { 365 list_for_each_entry(req, &b->written, wb_list) { 366 if (req->wb_page == page) 367 return req->wb_head; 368 } 369 list_for_each_entry(req, &b->committing, wb_list) { 370 if (req->wb_page == page) 371 return req->wb_head; 372 } 373 } 374 return NULL; 375 } 376 377 /* pnfs_generic_search_commit_reqs - Search lists in @cinfo for the head reqest 378 * for @page 379 * @cinfo - commit info for current inode 380 * @page - page to search for matching head request 381 * 382 * Returns a the head request if one is found, otherwise returns NULL. 383 */ 384 struct nfs_page * 385 pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page) 386 { 387 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 388 struct pnfs_commit_array *array; 389 struct nfs_page *req; 390 391 list_for_each_entry(array, &fl_cinfo->commits, cinfo_list) { 392 req = pnfs_bucket_search_commit_reqs(array->buckets, 393 array->nbuckets, page); 394 if (req) 395 return req; 396 } 397 return NULL; 398 } 399 EXPORT_SYMBOL_GPL(pnfs_generic_search_commit_reqs); 400 401 static struct pnfs_layout_segment * 402 pnfs_bucket_get_committing(struct list_head *head, 403 struct pnfs_commit_bucket *bucket, 404 struct nfs_commit_info *cinfo) 405 { 406 struct pnfs_layout_segment *lseg; 407 struct list_head *pos; 408 409 list_for_each(pos, &bucket->committing) 410 cinfo->ds->ncommitting--; 411 list_splice_init(&bucket->committing, head); 412 lseg = pnfs_free_bucket_lseg(bucket); 413 if (!lseg) 414 lseg = pnfs_get_lseg(bucket->lseg); 415 return lseg; 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(); 423 424 if (!data) 425 return NULL; 426 data->lseg = pnfs_bucket_get_committing(&data->pages, bucket, cinfo); 427 return data; 428 } 429 430 static void pnfs_generic_retry_commit(struct pnfs_commit_bucket *buckets, 431 unsigned int nbuckets, 432 struct nfs_commit_info *cinfo, 433 unsigned int idx) 434 { 435 struct pnfs_commit_bucket *bucket; 436 struct pnfs_layout_segment *freeme; 437 LIST_HEAD(pages); 438 439 for (bucket = buckets; idx < nbuckets; bucket++, idx++) { 440 if (list_empty(&bucket->committing)) 441 continue; 442 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 443 freeme = pnfs_bucket_get_committing(&pages, bucket, cinfo); 444 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 445 nfs_retry_commit(&pages, freeme, cinfo, idx); 446 pnfs_put_lseg(freeme); 447 } 448 } 449 450 static unsigned int 451 pnfs_bucket_alloc_ds_commits(struct list_head *list, 452 struct pnfs_commit_bucket *buckets, 453 unsigned int nbuckets, 454 struct nfs_commit_info *cinfo) 455 { 456 struct pnfs_commit_bucket *bucket; 457 struct nfs_commit_data *data; 458 unsigned int i; 459 unsigned int nreq = 0; 460 461 for (i = 0, bucket = buckets; i < nbuckets; i++, bucket++) { 462 if (list_empty(&bucket->committing)) 463 continue; 464 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 465 if (!list_empty(&bucket->committing)) { 466 data = pnfs_bucket_fetch_commitdata(bucket, cinfo); 467 if (!data) 468 goto out_error; 469 data->ds_commit_index = i; 470 list_add_tail(&data->list, list); 471 nreq++; 472 } 473 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 474 } 475 return nreq; 476 out_error: 477 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 478 /* Clean up on error */ 479 pnfs_generic_retry_commit(buckets, nbuckets, cinfo, i); 480 return nreq; 481 } 482 483 static unsigned int 484 pnfs_alloc_ds_commits_list(struct list_head *list, 485 struct pnfs_ds_commit_info *fl_cinfo, 486 struct nfs_commit_info *cinfo) 487 { 488 struct pnfs_commit_array *array; 489 unsigned int ret = 0; 490 491 rcu_read_lock(); 492 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { 493 if (!array->lseg || !pnfs_get_commit_array(array)) 494 continue; 495 rcu_read_unlock(); 496 ret += pnfs_bucket_alloc_ds_commits(list, array->buckets, 497 array->nbuckets, cinfo); 498 rcu_read_lock(); 499 pnfs_put_commit_array(array, cinfo->inode); 500 } 501 rcu_read_unlock(); 502 return ret; 503 } 504 505 /* This follows nfs_commit_list pretty closely */ 506 int 507 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 508 int how, struct nfs_commit_info *cinfo, 509 int (*initiate_commit)(struct nfs_commit_data *data, 510 int how)) 511 { 512 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 513 struct nfs_commit_data *data, *tmp; 514 LIST_HEAD(list); 515 unsigned int nreq = 0; 516 517 if (!list_empty(mds_pages)) { 518 data = nfs_commitdata_alloc(); 519 if (!data) { 520 nfs_retry_commit(mds_pages, NULL, cinfo, -1); 521 return -ENOMEM; 522 } 523 data->ds_commit_index = -1; 524 list_splice_init(mds_pages, &data->pages); 525 list_add_tail(&data->list, &list); 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 struct nfs4_pnfs_ds_addr *nfs4_pnfs_ds_addr_alloc(gfp_t gfp_flags) 665 { 666 struct nfs4_pnfs_ds_addr *da = kzalloc(sizeof(*da), gfp_flags); 667 if (da) 668 INIT_LIST_HEAD(&da->da_node); 669 return da; 670 } 671 672 static void nfs4_pnfs_ds_addr_free(struct nfs4_pnfs_ds_addr *da) 673 { 674 kfree(da->da_remotestr); 675 kfree(da->da_netid); 676 kfree(da); 677 } 678 679 static void destroy_ds(struct nfs4_pnfs_ds *ds) 680 { 681 struct nfs4_pnfs_ds_addr *da; 682 683 dprintk("--> %s\n", __func__); 684 ifdebug(FACILITY) 685 print_ds(ds); 686 687 nfs_put_client(ds->ds_clp); 688 689 while (!list_empty(&ds->ds_addrs)) { 690 da = list_first_entry(&ds->ds_addrs, 691 struct nfs4_pnfs_ds_addr, 692 da_node); 693 list_del_init(&da->da_node); 694 nfs4_pnfs_ds_addr_free(da); 695 } 696 697 kfree(ds->ds_remotestr); 698 kfree(ds); 699 } 700 701 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) 702 { 703 if (refcount_dec_and_lock(&ds->ds_count, 704 &nfs4_ds_cache_lock)) { 705 list_del_init(&ds->ds_node); 706 spin_unlock(&nfs4_ds_cache_lock); 707 destroy_ds(ds); 708 } 709 } 710 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); 711 712 /* 713 * Create a string with a human readable address and port to avoid 714 * complicated setup around many dprinks. 715 */ 716 static char * 717 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) 718 { 719 struct nfs4_pnfs_ds_addr *da; 720 char *remotestr; 721 size_t len; 722 char *p; 723 724 len = 3; /* '{', '}' and eol */ 725 list_for_each_entry(da, dsaddrs, da_node) { 726 len += strlen(da->da_remotestr) + 1; /* string plus comma */ 727 } 728 729 remotestr = kzalloc(len, gfp_flags); 730 if (!remotestr) 731 return NULL; 732 733 p = remotestr; 734 *(p++) = '{'; 735 len--; 736 list_for_each_entry(da, dsaddrs, da_node) { 737 size_t ll = strlen(da->da_remotestr); 738 739 if (ll > len) 740 goto out_err; 741 742 memcpy(p, da->da_remotestr, ll); 743 p += ll; 744 len -= ll; 745 746 if (len < 1) 747 goto out_err; 748 (*p++) = ','; 749 len--; 750 } 751 if (len < 2) 752 goto out_err; 753 *(p++) = '}'; 754 *p = '\0'; 755 return remotestr; 756 out_err: 757 kfree(remotestr); 758 return NULL; 759 } 760 761 /* 762 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if 763 * uncached and return cached struct nfs4_pnfs_ds. 764 */ 765 struct nfs4_pnfs_ds * 766 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) 767 { 768 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; 769 char *remotestr; 770 771 if (list_empty(dsaddrs)) { 772 dprintk("%s: no addresses defined\n", __func__); 773 goto out; 774 } 775 776 ds = kzalloc(sizeof(*ds), gfp_flags); 777 if (!ds) 778 goto out; 779 780 /* this is only used for debugging, so it's ok if its NULL */ 781 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); 782 783 spin_lock(&nfs4_ds_cache_lock); 784 tmp_ds = _data_server_lookup_locked(dsaddrs); 785 if (tmp_ds == NULL) { 786 INIT_LIST_HEAD(&ds->ds_addrs); 787 list_splice_init(dsaddrs, &ds->ds_addrs); 788 ds->ds_remotestr = remotestr; 789 refcount_set(&ds->ds_count, 1); 790 INIT_LIST_HEAD(&ds->ds_node); 791 ds->ds_clp = NULL; 792 list_add(&ds->ds_node, &nfs4_data_server_cache); 793 dprintk("%s add new data server %s\n", __func__, 794 ds->ds_remotestr); 795 } else { 796 kfree(remotestr); 797 kfree(ds); 798 refcount_inc(&tmp_ds->ds_count); 799 dprintk("%s data server %s found, inc'ed ds_count to %d\n", 800 __func__, tmp_ds->ds_remotestr, 801 refcount_read(&tmp_ds->ds_count)); 802 ds = tmp_ds; 803 } 804 spin_unlock(&nfs4_ds_cache_lock); 805 out: 806 return ds; 807 } 808 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); 809 810 static int nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) 811 { 812 might_sleep(); 813 return wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, TASK_KILLABLE); 814 } 815 816 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) 817 { 818 smp_mb__before_atomic(); 819 clear_and_wake_up_bit(NFS4DS_CONNECTING, &ds->ds_state); 820 } 821 822 static struct nfs_client *(*get_v3_ds_connect)( 823 struct nfs_server *mds_srv, 824 const struct sockaddr *ds_addr, 825 int ds_addrlen, 826 int ds_proto, 827 unsigned int ds_timeo, 828 unsigned int ds_retrans); 829 830 static bool load_v3_ds_connect(void) 831 { 832 if (!get_v3_ds_connect) { 833 get_v3_ds_connect = symbol_request(nfs3_set_ds_client); 834 WARN_ON_ONCE(!get_v3_ds_connect); 835 } 836 837 return(get_v3_ds_connect != NULL); 838 } 839 840 void nfs4_pnfs_v3_ds_connect_unload(void) 841 { 842 if (get_v3_ds_connect) { 843 symbol_put(nfs3_set_ds_client); 844 get_v3_ds_connect = NULL; 845 } 846 } 847 848 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, 849 struct nfs4_pnfs_ds *ds, 850 unsigned int timeo, 851 unsigned int retrans) 852 { 853 struct nfs_client *clp = ERR_PTR(-EIO); 854 struct nfs4_pnfs_ds_addr *da; 855 int status = 0; 856 857 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); 858 859 if (!load_v3_ds_connect()) 860 return -EPROTONOSUPPORT; 861 862 list_for_each_entry(da, &ds->ds_addrs, da_node) { 863 dprintk("%s: DS %s: trying address %s\n", 864 __func__, ds->ds_remotestr, da->da_remotestr); 865 866 if (!IS_ERR(clp)) { 867 struct xprt_create xprt_args = { 868 .ident = da->da_transport, 869 .net = clp->cl_net, 870 .dstaddr = (struct sockaddr *)&da->da_addr, 871 .addrlen = da->da_addrlen, 872 .servername = clp->cl_hostname, 873 }; 874 875 if (da->da_transport != clp->cl_proto) 876 continue; 877 if (da->da_addr.ss_family != clp->cl_addr.ss_family) 878 continue; 879 /* Add this address as an alias */ 880 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 881 rpc_clnt_test_and_add_xprt, NULL); 882 continue; 883 } 884 clp = get_v3_ds_connect(mds_srv, 885 (struct sockaddr *)&da->da_addr, 886 da->da_addrlen, da->da_transport, 887 timeo, retrans); 888 if (IS_ERR(clp)) 889 continue; 890 clp->cl_rpcclient->cl_softerr = 0; 891 clp->cl_rpcclient->cl_softrtry = 0; 892 } 893 894 if (IS_ERR(clp)) { 895 status = PTR_ERR(clp); 896 goto out; 897 } 898 899 smp_wmb(); 900 WRITE_ONCE(ds->ds_clp, clp); 901 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 902 out: 903 return status; 904 } 905 906 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, 907 struct nfs4_pnfs_ds *ds, 908 unsigned int timeo, 909 unsigned int retrans, 910 u32 minor_version) 911 { 912 struct nfs_client *clp = ERR_PTR(-EIO); 913 struct nfs4_pnfs_ds_addr *da; 914 int status = 0; 915 916 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); 917 918 list_for_each_entry(da, &ds->ds_addrs, da_node) { 919 dprintk("%s: DS %s: trying address %s\n", 920 __func__, ds->ds_remotestr, da->da_remotestr); 921 922 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { 923 struct xprt_create xprt_args = { 924 .ident = da->da_transport, 925 .net = clp->cl_net, 926 .dstaddr = (struct sockaddr *)&da->da_addr, 927 .addrlen = da->da_addrlen, 928 .servername = clp->cl_hostname, 929 }; 930 struct nfs4_add_xprt_data xprtdata = { 931 .clp = clp, 932 }; 933 struct rpc_add_xprt_test rpcdata = { 934 .add_xprt_test = clp->cl_mvops->session_trunk, 935 .data = &xprtdata, 936 }; 937 938 if (da->da_transport != clp->cl_proto) 939 continue; 940 if (da->da_addr.ss_family != clp->cl_addr.ss_family) 941 continue; 942 /** 943 * Test this address for session trunking and 944 * add as an alias 945 */ 946 xprtdata.cred = nfs4_get_clid_cred(clp), 947 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 948 rpc_clnt_setup_test_and_add_xprt, 949 &rpcdata); 950 if (xprtdata.cred) 951 put_cred(xprtdata.cred); 952 } else { 953 clp = nfs4_set_ds_client(mds_srv, 954 (struct sockaddr *)&da->da_addr, 955 da->da_addrlen, 956 da->da_transport, timeo, 957 retrans, minor_version); 958 if (IS_ERR(clp)) 959 continue; 960 961 status = nfs4_init_ds_session(clp, 962 mds_srv->nfs_client->cl_lease_time); 963 if (status) { 964 nfs_put_client(clp); 965 clp = ERR_PTR(-EIO); 966 continue; 967 } 968 969 } 970 } 971 972 if (IS_ERR(clp)) { 973 status = PTR_ERR(clp); 974 goto out; 975 } 976 977 smp_wmb(); 978 WRITE_ONCE(ds->ds_clp, clp); 979 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 980 out: 981 return status; 982 } 983 984 /* 985 * Create an rpc connection to the nfs4_pnfs_ds data server. 986 * Currently only supports IPv4 and IPv6 addresses. 987 * If connection fails, make devid unavailable and return a -errno. 988 */ 989 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 990 struct nfs4_deviceid_node *devid, unsigned int timeo, 991 unsigned int retrans, u32 version, u32 minor_version) 992 { 993 int err; 994 995 do { 996 err = nfs4_wait_ds_connect(ds); 997 if (err || ds->ds_clp) 998 goto out; 999 if (nfs4_test_deviceid_unavailable(devid)) 1000 return -ENODEV; 1001 } while (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) != 0); 1002 1003 if (ds->ds_clp) 1004 goto connect_done; 1005 1006 switch (version) { 1007 case 3: 1008 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, retrans); 1009 break; 1010 case 4: 1011 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, retrans, 1012 minor_version); 1013 break; 1014 default: 1015 dprintk("%s: unsupported DS version %d\n", __func__, version); 1016 err = -EPROTONOSUPPORT; 1017 } 1018 1019 connect_done: 1020 nfs4_clear_ds_conn_bit(ds); 1021 out: 1022 /* 1023 * At this point the ds->ds_clp should be ready, but it might have 1024 * hit an error. 1025 */ 1026 if (!err) { 1027 if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) { 1028 WARN_ON_ONCE(ds->ds_clp || 1029 !nfs4_test_deviceid_unavailable(devid)); 1030 return -EINVAL; 1031 } 1032 err = nfs_client_init_status(ds->ds_clp); 1033 } 1034 1035 return err; 1036 } 1037 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); 1038 1039 /* 1040 * Currently only supports ipv4, ipv6 and one multi-path address. 1041 */ 1042 struct nfs4_pnfs_ds_addr * 1043 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) 1044 { 1045 struct nfs4_pnfs_ds_addr *da = NULL; 1046 char *buf, *portstr; 1047 __be16 port; 1048 ssize_t nlen, rlen; 1049 int tmp[2]; 1050 char *netid; 1051 size_t len; 1052 char *startsep = ""; 1053 char *endsep = ""; 1054 1055 1056 /* r_netid */ 1057 nlen = xdr_stream_decode_string_dup(xdr, &netid, XDR_MAX_NETOBJ, 1058 gfp_flags); 1059 if (unlikely(nlen < 0)) 1060 goto out_err; 1061 1062 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ 1063 /* port is ".ABC.DEF", 8 chars max */ 1064 rlen = xdr_stream_decode_string_dup(xdr, &buf, INET6_ADDRSTRLEN + 1065 IPV6_SCOPE_ID_LEN + 8, gfp_flags); 1066 if (unlikely(rlen < 0)) 1067 goto out_free_netid; 1068 1069 /* replace port '.' with '-' */ 1070 portstr = strrchr(buf, '.'); 1071 if (!portstr) { 1072 dprintk("%s: Failed finding expected dot in port\n", 1073 __func__); 1074 goto out_free_buf; 1075 } 1076 *portstr = '-'; 1077 1078 /* find '.' between address and port */ 1079 portstr = strrchr(buf, '.'); 1080 if (!portstr) { 1081 dprintk("%s: Failed finding expected dot between address and " 1082 "port\n", __func__); 1083 goto out_free_buf; 1084 } 1085 *portstr = '\0'; 1086 1087 da = nfs4_pnfs_ds_addr_alloc(gfp_flags); 1088 if (unlikely(!da)) 1089 goto out_free_buf; 1090 1091 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, 1092 sizeof(da->da_addr))) { 1093 dprintk("%s: error parsing address %s\n", __func__, buf); 1094 goto out_free_da; 1095 } 1096 1097 portstr++; 1098 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); 1099 port = htons((tmp[0] << 8) | (tmp[1])); 1100 1101 switch (da->da_addr.ss_family) { 1102 case AF_INET: 1103 ((struct sockaddr_in *)&da->da_addr)->sin_port = port; 1104 da->da_addrlen = sizeof(struct sockaddr_in); 1105 break; 1106 1107 case AF_INET6: 1108 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; 1109 da->da_addrlen = sizeof(struct sockaddr_in6); 1110 startsep = "["; 1111 endsep = "]"; 1112 break; 1113 1114 default: 1115 dprintk("%s: unsupported address family: %u\n", 1116 __func__, da->da_addr.ss_family); 1117 goto out_free_da; 1118 } 1119 1120 da->da_transport = xprt_find_transport_ident(netid); 1121 if (da->da_transport < 0) { 1122 dprintk("%s: ERROR: unknown r_netid \"%s\"\n", 1123 __func__, netid); 1124 goto out_free_da; 1125 } 1126 1127 da->da_netid = netid; 1128 1129 /* save human readable address */ 1130 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; 1131 da->da_remotestr = kzalloc(len, gfp_flags); 1132 1133 /* NULL is ok, only used for dprintk */ 1134 if (da->da_remotestr) 1135 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, 1136 buf, endsep, ntohs(port)); 1137 1138 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); 1139 kfree(buf); 1140 return da; 1141 1142 out_free_da: 1143 kfree(da); 1144 out_free_buf: 1145 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); 1146 kfree(buf); 1147 out_free_netid: 1148 kfree(netid); 1149 out_err: 1150 return NULL; 1151 } 1152 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); 1153 1154 void 1155 pnfs_layout_mark_request_commit(struct nfs_page *req, 1156 struct pnfs_layout_segment *lseg, 1157 struct nfs_commit_info *cinfo, 1158 u32 ds_commit_idx) 1159 { 1160 struct list_head *list; 1161 struct pnfs_commit_array *array; 1162 struct pnfs_commit_bucket *bucket; 1163 1164 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 1165 array = pnfs_lookup_commit_array(cinfo->ds, lseg); 1166 if (!array || !pnfs_is_valid_lseg(lseg)) 1167 goto out_resched; 1168 bucket = &array->buckets[ds_commit_idx]; 1169 list = &bucket->written; 1170 /* Non-empty buckets hold a reference on the lseg. That ref 1171 * is normally transferred to the COMMIT call and released 1172 * there. It could also be released if the last req is pulled 1173 * off due to a rewrite, in which case it will be done in 1174 * pnfs_common_clear_request_commit 1175 */ 1176 if (!bucket->lseg) 1177 bucket->lseg = pnfs_get_lseg(lseg); 1178 set_bit(PG_COMMIT_TO_DS, &req->wb_flags); 1179 cinfo->ds->nwritten++; 1180 1181 nfs_request_add_commit_list_locked(req, list, cinfo); 1182 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1183 nfs_mark_page_unstable(req->wb_page, cinfo); 1184 return; 1185 out_resched: 1186 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1187 cinfo->completion_ops->resched_write(cinfo, req); 1188 } 1189 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); 1190 1191 int 1192 pnfs_nfs_generic_sync(struct inode *inode, bool datasync) 1193 { 1194 int ret; 1195 1196 if (!pnfs_layoutcommit_outstanding(inode)) 1197 return 0; 1198 ret = nfs_commit_inode(inode, FLUSH_SYNC); 1199 if (ret < 0) 1200 return ret; 1201 if (datasync) 1202 return 0; 1203 return pnfs_layoutcommit_inode(inode, true); 1204 } 1205 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); 1206 1207