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(false); 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 atomic_inc(&cinfo->mds->rpcs_out); 472 nreq++; 473 } 474 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 475 } 476 return nreq; 477 out_error: 478 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 479 /* Clean up on error */ 480 pnfs_generic_retry_commit(buckets, nbuckets, cinfo, i); 481 return nreq; 482 } 483 484 static unsigned int 485 pnfs_alloc_ds_commits_list(struct list_head *list, 486 struct pnfs_ds_commit_info *fl_cinfo, 487 struct nfs_commit_info *cinfo) 488 { 489 struct pnfs_commit_array *array; 490 unsigned int ret = 0; 491 492 rcu_read_lock(); 493 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) { 494 if (!array->lseg || !pnfs_get_commit_array(array)) 495 continue; 496 rcu_read_unlock(); 497 ret += pnfs_bucket_alloc_ds_commits(list, array->buckets, 498 array->nbuckets, cinfo); 499 rcu_read_lock(); 500 pnfs_put_commit_array(array, cinfo->inode); 501 } 502 rcu_read_unlock(); 503 return ret; 504 } 505 506 /* This follows nfs_commit_list pretty closely */ 507 int 508 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 509 int how, struct nfs_commit_info *cinfo, 510 int (*initiate_commit)(struct nfs_commit_data *data, 511 int how)) 512 { 513 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 514 struct nfs_commit_data *data, *tmp; 515 LIST_HEAD(list); 516 unsigned int nreq = 0; 517 518 if (!list_empty(mds_pages)) { 519 data = nfs_commitdata_alloc(true); 520 data->ds_commit_index = -1; 521 list_splice_init(mds_pages, &data->pages); 522 list_add_tail(&data->list, &list); 523 atomic_inc(&cinfo->mds->rpcs_out); 524 nreq++; 525 } 526 527 nreq += pnfs_alloc_ds_commits_list(&list, fl_cinfo, cinfo); 528 if (nreq == 0) 529 goto out; 530 531 list_for_each_entry_safe(data, tmp, &list, list) { 532 list_del(&data->list); 533 if (data->ds_commit_index < 0) { 534 nfs_init_commit(data, NULL, NULL, cinfo); 535 nfs_initiate_commit(NFS_CLIENT(inode), data, 536 NFS_PROTO(data->inode), 537 data->mds_ops, how, 538 RPC_TASK_CRED_NOREF); 539 } else { 540 nfs_init_commit(data, NULL, data->lseg, cinfo); 541 initiate_commit(data, how); 542 } 543 } 544 out: 545 return PNFS_ATTEMPTED; 546 } 547 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); 548 549 /* 550 * Data server cache 551 * 552 * Data servers can be mapped to different device ids. 553 * nfs4_pnfs_ds reference counting 554 * - set to 1 on allocation 555 * - incremented when a device id maps a data server already in the cache. 556 * - decremented when deviceid is removed from the cache. 557 */ 558 static DEFINE_SPINLOCK(nfs4_ds_cache_lock); 559 static LIST_HEAD(nfs4_data_server_cache); 560 561 /* Debug routines */ 562 static void 563 print_ds(struct nfs4_pnfs_ds *ds) 564 { 565 if (ds == NULL) { 566 printk(KERN_WARNING "%s NULL device\n", __func__); 567 return; 568 } 569 printk(KERN_WARNING " ds %s\n" 570 " ref count %d\n" 571 " client %p\n" 572 " cl_exchange_flags %x\n", 573 ds->ds_remotestr, 574 refcount_read(&ds->ds_count), ds->ds_clp, 575 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); 576 } 577 578 static bool 579 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) 580 { 581 struct sockaddr_in *a, *b; 582 struct sockaddr_in6 *a6, *b6; 583 584 if (addr1->sa_family != addr2->sa_family) 585 return false; 586 587 switch (addr1->sa_family) { 588 case AF_INET: 589 a = (struct sockaddr_in *)addr1; 590 b = (struct sockaddr_in *)addr2; 591 592 if (a->sin_addr.s_addr == b->sin_addr.s_addr && 593 a->sin_port == b->sin_port) 594 return true; 595 break; 596 597 case AF_INET6: 598 a6 = (struct sockaddr_in6 *)addr1; 599 b6 = (struct sockaddr_in6 *)addr2; 600 601 /* LINKLOCAL addresses must have matching scope_id */ 602 if (ipv6_addr_src_scope(&a6->sin6_addr) == 603 IPV6_ADDR_SCOPE_LINKLOCAL && 604 a6->sin6_scope_id != b6->sin6_scope_id) 605 return false; 606 607 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && 608 a6->sin6_port == b6->sin6_port) 609 return true; 610 break; 611 612 default: 613 dprintk("%s: unhandled address family: %u\n", 614 __func__, addr1->sa_family); 615 return false; 616 } 617 618 return false; 619 } 620 621 /* 622 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, 623 * declare a match. 624 */ 625 static bool 626 _same_data_server_addrs_locked(const struct list_head *dsaddrs1, 627 const struct list_head *dsaddrs2) 628 { 629 struct nfs4_pnfs_ds_addr *da1, *da2; 630 struct sockaddr *sa1, *sa2; 631 bool match = false; 632 633 list_for_each_entry(da1, dsaddrs1, da_node) { 634 sa1 = (struct sockaddr *)&da1->da_addr; 635 match = false; 636 list_for_each_entry(da2, dsaddrs2, da_node) { 637 sa2 = (struct sockaddr *)&da2->da_addr; 638 match = same_sockaddr(sa1, sa2); 639 if (match) 640 break; 641 } 642 if (!match) 643 break; 644 } 645 return match; 646 } 647 648 /* 649 * Lookup DS by addresses. nfs4_ds_cache_lock is held 650 */ 651 static struct nfs4_pnfs_ds * 652 _data_server_lookup_locked(const struct list_head *dsaddrs) 653 { 654 struct nfs4_pnfs_ds *ds; 655 656 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) 657 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) 658 return ds; 659 return NULL; 660 } 661 662 static struct nfs4_pnfs_ds_addr *nfs4_pnfs_ds_addr_alloc(gfp_t gfp_flags) 663 { 664 struct nfs4_pnfs_ds_addr *da = kzalloc(sizeof(*da), gfp_flags); 665 if (da) 666 INIT_LIST_HEAD(&da->da_node); 667 return da; 668 } 669 670 static void nfs4_pnfs_ds_addr_free(struct nfs4_pnfs_ds_addr *da) 671 { 672 kfree(da->da_remotestr); 673 kfree(da->da_netid); 674 kfree(da); 675 } 676 677 static void destroy_ds(struct nfs4_pnfs_ds *ds) 678 { 679 struct nfs4_pnfs_ds_addr *da; 680 681 dprintk("--> %s\n", __func__); 682 ifdebug(FACILITY) 683 print_ds(ds); 684 685 nfs_put_client(ds->ds_clp); 686 687 while (!list_empty(&ds->ds_addrs)) { 688 da = list_first_entry(&ds->ds_addrs, 689 struct nfs4_pnfs_ds_addr, 690 da_node); 691 list_del_init(&da->da_node); 692 nfs4_pnfs_ds_addr_free(da); 693 } 694 695 kfree(ds->ds_remotestr); 696 kfree(ds); 697 } 698 699 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) 700 { 701 if (refcount_dec_and_lock(&ds->ds_count, 702 &nfs4_ds_cache_lock)) { 703 list_del_init(&ds->ds_node); 704 spin_unlock(&nfs4_ds_cache_lock); 705 destroy_ds(ds); 706 } 707 } 708 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); 709 710 /* 711 * Create a string with a human readable address and port to avoid 712 * complicated setup around many dprinks. 713 */ 714 static char * 715 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) 716 { 717 struct nfs4_pnfs_ds_addr *da; 718 char *remotestr; 719 size_t len; 720 char *p; 721 722 len = 3; /* '{', '}' and eol */ 723 list_for_each_entry(da, dsaddrs, da_node) { 724 len += strlen(da->da_remotestr) + 1; /* string plus comma */ 725 } 726 727 remotestr = kzalloc(len, gfp_flags); 728 if (!remotestr) 729 return NULL; 730 731 p = remotestr; 732 *(p++) = '{'; 733 len--; 734 list_for_each_entry(da, dsaddrs, da_node) { 735 size_t ll = strlen(da->da_remotestr); 736 737 if (ll > len) 738 goto out_err; 739 740 memcpy(p, da->da_remotestr, ll); 741 p += ll; 742 len -= ll; 743 744 if (len < 1) 745 goto out_err; 746 (*p++) = ','; 747 len--; 748 } 749 if (len < 2) 750 goto out_err; 751 *(p++) = '}'; 752 *p = '\0'; 753 return remotestr; 754 out_err: 755 kfree(remotestr); 756 return NULL; 757 } 758 759 /* 760 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if 761 * uncached and return cached struct nfs4_pnfs_ds. 762 */ 763 struct nfs4_pnfs_ds * 764 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) 765 { 766 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; 767 char *remotestr; 768 769 if (list_empty(dsaddrs)) { 770 dprintk("%s: no addresses defined\n", __func__); 771 goto out; 772 } 773 774 ds = kzalloc(sizeof(*ds), gfp_flags); 775 if (!ds) 776 goto out; 777 778 /* this is only used for debugging, so it's ok if its NULL */ 779 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); 780 781 spin_lock(&nfs4_ds_cache_lock); 782 tmp_ds = _data_server_lookup_locked(dsaddrs); 783 if (tmp_ds == NULL) { 784 INIT_LIST_HEAD(&ds->ds_addrs); 785 list_splice_init(dsaddrs, &ds->ds_addrs); 786 ds->ds_remotestr = remotestr; 787 refcount_set(&ds->ds_count, 1); 788 INIT_LIST_HEAD(&ds->ds_node); 789 ds->ds_clp = NULL; 790 list_add(&ds->ds_node, &nfs4_data_server_cache); 791 dprintk("%s add new data server %s\n", __func__, 792 ds->ds_remotestr); 793 } else { 794 kfree(remotestr); 795 kfree(ds); 796 refcount_inc(&tmp_ds->ds_count); 797 dprintk("%s data server %s found, inc'ed ds_count to %d\n", 798 __func__, tmp_ds->ds_remotestr, 799 refcount_read(&tmp_ds->ds_count)); 800 ds = tmp_ds; 801 } 802 spin_unlock(&nfs4_ds_cache_lock); 803 out: 804 return ds; 805 } 806 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); 807 808 static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) 809 { 810 might_sleep(); 811 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, 812 TASK_KILLABLE); 813 } 814 815 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) 816 { 817 smp_mb__before_atomic(); 818 clear_bit(NFS4DS_CONNECTING, &ds->ds_state); 819 smp_mb__after_atomic(); 820 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); 821 } 822 823 static struct nfs_client *(*get_v3_ds_connect)( 824 struct nfs_server *mds_srv, 825 const struct sockaddr *ds_addr, 826 int ds_addrlen, 827 int ds_proto, 828 unsigned int ds_timeo, 829 unsigned int ds_retrans); 830 831 static bool load_v3_ds_connect(void) 832 { 833 if (!get_v3_ds_connect) { 834 get_v3_ds_connect = symbol_request(nfs3_set_ds_client); 835 WARN_ON_ONCE(!get_v3_ds_connect); 836 } 837 838 return(get_v3_ds_connect != NULL); 839 } 840 841 void nfs4_pnfs_v3_ds_connect_unload(void) 842 { 843 if (get_v3_ds_connect) { 844 symbol_put(nfs3_set_ds_client); 845 get_v3_ds_connect = NULL; 846 } 847 } 848 849 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, 850 struct nfs4_pnfs_ds *ds, 851 unsigned int timeo, 852 unsigned int retrans) 853 { 854 struct nfs_client *clp = ERR_PTR(-EIO); 855 struct nfs4_pnfs_ds_addr *da; 856 int status = 0; 857 858 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); 859 860 if (!load_v3_ds_connect()) 861 goto out; 862 863 list_for_each_entry(da, &ds->ds_addrs, da_node) { 864 dprintk("%s: DS %s: trying address %s\n", 865 __func__, ds->ds_remotestr, da->da_remotestr); 866 867 if (!IS_ERR(clp)) { 868 struct xprt_create xprt_args = { 869 .ident = da->da_transport, 870 .net = clp->cl_net, 871 .dstaddr = (struct sockaddr *)&da->da_addr, 872 .addrlen = da->da_addrlen, 873 .servername = clp->cl_hostname, 874 }; 875 876 if (da->da_transport != clp->cl_proto) 877 continue; 878 if (da->da_addr.ss_family != clp->cl_addr.ss_family) 879 continue; 880 /* Add this address as an alias */ 881 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 882 rpc_clnt_test_and_add_xprt, NULL); 883 continue; 884 } 885 clp = get_v3_ds_connect(mds_srv, 886 (struct sockaddr *)&da->da_addr, 887 da->da_addrlen, da->da_transport, 888 timeo, retrans); 889 if (IS_ERR(clp)) 890 continue; 891 clp->cl_rpcclient->cl_softerr = 0; 892 clp->cl_rpcclient->cl_softrtry = 0; 893 } 894 895 if (IS_ERR(clp)) { 896 status = PTR_ERR(clp); 897 goto out; 898 } 899 900 smp_wmb(); 901 ds->ds_clp = clp; 902 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 903 out: 904 return status; 905 } 906 907 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, 908 struct nfs4_pnfs_ds *ds, 909 unsigned int timeo, 910 unsigned int retrans, 911 u32 minor_version) 912 { 913 struct nfs_client *clp = ERR_PTR(-EIO); 914 struct nfs4_pnfs_ds_addr *da; 915 int status = 0; 916 917 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); 918 919 list_for_each_entry(da, &ds->ds_addrs, da_node) { 920 dprintk("%s: DS %s: trying address %s\n", 921 __func__, ds->ds_remotestr, da->da_remotestr); 922 923 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { 924 struct xprt_create xprt_args = { 925 .ident = da->da_transport, 926 .net = clp->cl_net, 927 .dstaddr = (struct sockaddr *)&da->da_addr, 928 .addrlen = da->da_addrlen, 929 .servername = clp->cl_hostname, 930 }; 931 struct nfs4_add_xprt_data xprtdata = { 932 .clp = clp, 933 }; 934 struct rpc_add_xprt_test rpcdata = { 935 .add_xprt_test = clp->cl_mvops->session_trunk, 936 .data = &xprtdata, 937 }; 938 939 if (da->da_transport != clp->cl_proto) 940 continue; 941 if (da->da_addr.ss_family != clp->cl_addr.ss_family) 942 continue; 943 /** 944 * Test this address for session trunking and 945 * add as an alias 946 */ 947 xprtdata.cred = nfs4_get_clid_cred(clp), 948 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 949 rpc_clnt_setup_test_and_add_xprt, 950 &rpcdata); 951 if (xprtdata.cred) 952 put_cred(xprtdata.cred); 953 } else { 954 clp = nfs4_set_ds_client(mds_srv, 955 (struct sockaddr *)&da->da_addr, 956 da->da_addrlen, 957 da->da_transport, timeo, 958 retrans, minor_version); 959 if (IS_ERR(clp)) 960 continue; 961 962 status = nfs4_init_ds_session(clp, 963 mds_srv->nfs_client->cl_lease_time); 964 if (status) { 965 nfs_put_client(clp); 966 clp = ERR_PTR(-EIO); 967 continue; 968 } 969 970 } 971 } 972 973 if (IS_ERR(clp)) { 974 status = PTR_ERR(clp); 975 goto out; 976 } 977 978 smp_wmb(); 979 ds->ds_clp = clp; 980 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 981 out: 982 return status; 983 } 984 985 /* 986 * Create an rpc connection to the nfs4_pnfs_ds data server. 987 * Currently only supports IPv4 and IPv6 addresses. 988 * If connection fails, make devid unavailable and return a -errno. 989 */ 990 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 991 struct nfs4_deviceid_node *devid, unsigned int timeo, 992 unsigned int retrans, u32 version, u32 minor_version) 993 { 994 int err; 995 996 again: 997 err = 0; 998 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { 999 if (version == 3) { 1000 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, 1001 retrans); 1002 } else if (version == 4) { 1003 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, 1004 retrans, minor_version); 1005 } else { 1006 dprintk("%s: unsupported DS version %d\n", __func__, 1007 version); 1008 err = -EPROTONOSUPPORT; 1009 } 1010 1011 nfs4_clear_ds_conn_bit(ds); 1012 } else { 1013 nfs4_wait_ds_connect(ds); 1014 1015 /* what was waited on didn't connect AND didn't mark unavail */ 1016 if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid)) 1017 goto again; 1018 } 1019 1020 /* 1021 * At this point the ds->ds_clp should be ready, but it might have 1022 * hit an error. 1023 */ 1024 if (!err) { 1025 if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) { 1026 WARN_ON_ONCE(ds->ds_clp || 1027 !nfs4_test_deviceid_unavailable(devid)); 1028 return -EINVAL; 1029 } 1030 err = nfs_client_init_status(ds->ds_clp); 1031 } 1032 1033 return err; 1034 } 1035 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); 1036 1037 /* 1038 * Currently only supports ipv4, ipv6 and one multi-path address. 1039 */ 1040 struct nfs4_pnfs_ds_addr * 1041 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) 1042 { 1043 struct nfs4_pnfs_ds_addr *da = NULL; 1044 char *buf, *portstr; 1045 __be16 port; 1046 ssize_t nlen, rlen; 1047 int tmp[2]; 1048 char *netid; 1049 size_t len; 1050 char *startsep = ""; 1051 char *endsep = ""; 1052 1053 1054 /* r_netid */ 1055 nlen = xdr_stream_decode_string_dup(xdr, &netid, XDR_MAX_NETOBJ, 1056 gfp_flags); 1057 if (unlikely(nlen < 0)) 1058 goto out_err; 1059 1060 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ 1061 /* port is ".ABC.DEF", 8 chars max */ 1062 rlen = xdr_stream_decode_string_dup(xdr, &buf, INET6_ADDRSTRLEN + 1063 IPV6_SCOPE_ID_LEN + 8, gfp_flags); 1064 if (unlikely(rlen < 0)) 1065 goto out_free_netid; 1066 1067 /* replace port '.' with '-' */ 1068 portstr = strrchr(buf, '.'); 1069 if (!portstr) { 1070 dprintk("%s: Failed finding expected dot in port\n", 1071 __func__); 1072 goto out_free_buf; 1073 } 1074 *portstr = '-'; 1075 1076 /* find '.' between address and port */ 1077 portstr = strrchr(buf, '.'); 1078 if (!portstr) { 1079 dprintk("%s: Failed finding expected dot between address and " 1080 "port\n", __func__); 1081 goto out_free_buf; 1082 } 1083 *portstr = '\0'; 1084 1085 da = nfs4_pnfs_ds_addr_alloc(gfp_flags); 1086 if (unlikely(!da)) 1087 goto out_free_buf; 1088 1089 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, 1090 sizeof(da->da_addr))) { 1091 dprintk("%s: error parsing address %s\n", __func__, buf); 1092 goto out_free_da; 1093 } 1094 1095 portstr++; 1096 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); 1097 port = htons((tmp[0] << 8) | (tmp[1])); 1098 1099 switch (da->da_addr.ss_family) { 1100 case AF_INET: 1101 ((struct sockaddr_in *)&da->da_addr)->sin_port = port; 1102 da->da_addrlen = sizeof(struct sockaddr_in); 1103 break; 1104 1105 case AF_INET6: 1106 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; 1107 da->da_addrlen = sizeof(struct sockaddr_in6); 1108 startsep = "["; 1109 endsep = "]"; 1110 break; 1111 1112 default: 1113 dprintk("%s: unsupported address family: %u\n", 1114 __func__, da->da_addr.ss_family); 1115 goto out_free_da; 1116 } 1117 1118 da->da_transport = xprt_find_transport_ident(netid); 1119 if (da->da_transport < 0) { 1120 dprintk("%s: ERROR: unknown r_netid \"%s\"\n", 1121 __func__, netid); 1122 goto out_free_da; 1123 } 1124 1125 da->da_netid = netid; 1126 1127 /* save human readable address */ 1128 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; 1129 da->da_remotestr = kzalloc(len, gfp_flags); 1130 1131 /* NULL is ok, only used for dprintk */ 1132 if (da->da_remotestr) 1133 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, 1134 buf, endsep, ntohs(port)); 1135 1136 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); 1137 kfree(buf); 1138 return da; 1139 1140 out_free_da: 1141 kfree(da); 1142 out_free_buf: 1143 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); 1144 kfree(buf); 1145 out_free_netid: 1146 kfree(netid); 1147 out_err: 1148 return NULL; 1149 } 1150 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); 1151 1152 void 1153 pnfs_layout_mark_request_commit(struct nfs_page *req, 1154 struct pnfs_layout_segment *lseg, 1155 struct nfs_commit_info *cinfo, 1156 u32 ds_commit_idx) 1157 { 1158 struct list_head *list; 1159 struct pnfs_commit_array *array; 1160 struct pnfs_commit_bucket *bucket; 1161 1162 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); 1163 array = pnfs_lookup_commit_array(cinfo->ds, lseg); 1164 if (!array || !pnfs_is_valid_lseg(lseg)) 1165 goto out_resched; 1166 bucket = &array->buckets[ds_commit_idx]; 1167 list = &bucket->written; 1168 /* Non-empty buckets hold a reference on the lseg. That ref 1169 * is normally transferred to the COMMIT call and released 1170 * there. It could also be released if the last req is pulled 1171 * off due to a rewrite, in which case it will be done in 1172 * pnfs_common_clear_request_commit 1173 */ 1174 if (!bucket->lseg) 1175 bucket->lseg = pnfs_get_lseg(lseg); 1176 set_bit(PG_COMMIT_TO_DS, &req->wb_flags); 1177 cinfo->ds->nwritten++; 1178 1179 nfs_request_add_commit_list_locked(req, list, cinfo); 1180 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1181 nfs_mark_page_unstable(req->wb_page, cinfo); 1182 return; 1183 out_resched: 1184 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); 1185 cinfo->completion_ops->resched_write(cinfo, req); 1186 } 1187 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); 1188 1189 int 1190 pnfs_nfs_generic_sync(struct inode *inode, bool datasync) 1191 { 1192 int ret; 1193 1194 if (!pnfs_layoutcommit_outstanding(inode)) 1195 return 0; 1196 ret = nfs_commit_inode(inode, FLUSH_SYNC); 1197 if (ret < 0) 1198 return ret; 1199 if (datasync) 1200 return 0; 1201 return pnfs_layoutcommit_inode(inode, true); 1202 } 1203 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); 1204 1205