1 /* 2 * Common NFS I/O operations for the pnfs file based 3 * layout drivers. 4 * 5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved. 6 * 7 * Tom Haynes <loghyr@primarydata.com> 8 */ 9 10 #include <linux/nfs_fs.h> 11 #include <linux/nfs_page.h> 12 #include <linux/sunrpc/addr.h> 13 #include <linux/module.h> 14 15 #include "nfs4session.h" 16 #include "internal.h" 17 #include "pnfs.h" 18 19 #define NFSDBG_FACILITY NFSDBG_PNFS 20 21 void pnfs_generic_rw_release(void *data) 22 { 23 struct nfs_pgio_header *hdr = data; 24 25 nfs_put_client(hdr->ds_clp); 26 hdr->mds_ops->rpc_release(data); 27 } 28 EXPORT_SYMBOL_GPL(pnfs_generic_rw_release); 29 30 /* Fake up some data that will cause nfs_commit_release to retry the writes. */ 31 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data) 32 { 33 struct nfs_page *first = nfs_list_entry(data->pages.next); 34 35 data->task.tk_status = 0; 36 memcpy(&data->verf.verifier, &first->wb_verf, 37 sizeof(data->verf.verifier)); 38 data->verf.verifier.data[0]++; /* ensure verifier mismatch */ 39 } 40 EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes); 41 42 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data) 43 { 44 struct nfs_commit_data *wdata = data; 45 46 /* Note this may cause RPC to be resent */ 47 wdata->mds_ops->rpc_call_done(task, data); 48 } 49 EXPORT_SYMBOL_GPL(pnfs_generic_write_commit_done); 50 51 void pnfs_generic_commit_release(void *calldata) 52 { 53 struct nfs_commit_data *data = calldata; 54 55 data->completion_ops->completion(data); 56 pnfs_put_lseg(data->lseg); 57 nfs_put_client(data->ds_clp); 58 nfs_commitdata_release(data); 59 } 60 EXPORT_SYMBOL_GPL(pnfs_generic_commit_release); 61 62 /* The generic layer is about to remove the req from the commit list. 63 * If this will make the bucket empty, it will need to put the lseg reference. 64 * Note this must be called holding the inode (/cinfo) lock 65 */ 66 void 67 pnfs_generic_clear_request_commit(struct nfs_page *req, 68 struct nfs_commit_info *cinfo) 69 { 70 struct pnfs_layout_segment *freeme = NULL; 71 72 if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags)) 73 goto out; 74 cinfo->ds->nwritten--; 75 if (list_is_singular(&req->wb_list)) { 76 struct pnfs_commit_bucket *bucket; 77 78 bucket = list_first_entry(&req->wb_list, 79 struct pnfs_commit_bucket, 80 written); 81 freeme = bucket->wlseg; 82 bucket->wlseg = NULL; 83 } 84 out: 85 nfs_request_remove_commit_list(req, cinfo); 86 pnfs_put_lseg_locked(freeme); 87 } 88 EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit); 89 90 static int 91 pnfs_generic_transfer_commit_list(struct list_head *src, struct list_head *dst, 92 struct nfs_commit_info *cinfo, int max) 93 { 94 struct nfs_page *req, *tmp; 95 int ret = 0; 96 97 list_for_each_entry_safe(req, tmp, src, wb_list) { 98 if (!nfs_lock_request(req)) 99 continue; 100 kref_get(&req->wb_kref); 101 if (cond_resched_lock(cinfo->lock)) 102 list_safe_reset_next(req, tmp, wb_list); 103 nfs_request_remove_commit_list(req, cinfo); 104 clear_bit(PG_COMMIT_TO_DS, &req->wb_flags); 105 nfs_list_add_request(req, dst); 106 ret++; 107 if ((ret == max) && !cinfo->dreq) 108 break; 109 } 110 return ret; 111 } 112 113 static int 114 pnfs_generic_scan_ds_commit_list(struct pnfs_commit_bucket *bucket, 115 struct nfs_commit_info *cinfo, 116 int max) 117 { 118 struct list_head *src = &bucket->written; 119 struct list_head *dst = &bucket->committing; 120 int ret; 121 122 lockdep_assert_held(cinfo->lock); 123 ret = pnfs_generic_transfer_commit_list(src, dst, cinfo, max); 124 if (ret) { 125 cinfo->ds->nwritten -= ret; 126 cinfo->ds->ncommitting += ret; 127 if (bucket->clseg == NULL) 128 bucket->clseg = pnfs_get_lseg(bucket->wlseg); 129 if (list_empty(src)) { 130 pnfs_put_lseg_locked(bucket->wlseg); 131 bucket->wlseg = NULL; 132 } 133 } 134 return ret; 135 } 136 137 /* Move reqs from written to committing lists, returning count 138 * of number moved. 139 */ 140 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, 141 int max) 142 { 143 int i, rv = 0, cnt; 144 145 lockdep_assert_held(cinfo->lock); 146 for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) { 147 cnt = pnfs_generic_scan_ds_commit_list(&cinfo->ds->buckets[i], 148 cinfo, max); 149 max -= cnt; 150 rv += cnt; 151 } 152 return rv; 153 } 154 EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists); 155 156 /* Pull everything off the committing lists and dump into @dst. */ 157 void pnfs_generic_recover_commit_reqs(struct list_head *dst, 158 struct nfs_commit_info *cinfo) 159 { 160 struct pnfs_commit_bucket *b; 161 struct pnfs_layout_segment *freeme; 162 int i; 163 164 lockdep_assert_held(cinfo->lock); 165 restart: 166 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { 167 if (pnfs_generic_transfer_commit_list(&b->written, dst, 168 cinfo, 0)) { 169 freeme = b->wlseg; 170 b->wlseg = NULL; 171 spin_unlock(cinfo->lock); 172 pnfs_put_lseg(freeme); 173 spin_lock(cinfo->lock); 174 goto restart; 175 } 176 } 177 cinfo->ds->nwritten = 0; 178 } 179 EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs); 180 181 static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx) 182 { 183 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; 184 struct pnfs_commit_bucket *bucket; 185 struct pnfs_layout_segment *freeme; 186 LIST_HEAD(pages); 187 int i; 188 189 spin_lock(cinfo->lock); 190 for (i = idx; i < fl_cinfo->nbuckets; i++) { 191 bucket = &fl_cinfo->buckets[i]; 192 if (list_empty(&bucket->committing)) 193 continue; 194 freeme = bucket->clseg; 195 bucket->clseg = NULL; 196 list_splice_init(&bucket->committing, &pages); 197 spin_unlock(cinfo->lock); 198 nfs_retry_commit(&pages, freeme, cinfo, i); 199 pnfs_put_lseg(freeme); 200 spin_lock(cinfo->lock); 201 } 202 spin_unlock(cinfo->lock); 203 } 204 205 static unsigned int 206 pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo, 207 struct list_head *list) 208 { 209 struct pnfs_ds_commit_info *fl_cinfo; 210 struct pnfs_commit_bucket *bucket; 211 struct nfs_commit_data *data; 212 int i; 213 unsigned int nreq = 0; 214 215 fl_cinfo = cinfo->ds; 216 bucket = fl_cinfo->buckets; 217 for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) { 218 if (list_empty(&bucket->committing)) 219 continue; 220 data = nfs_commitdata_alloc(); 221 if (!data) 222 break; 223 data->ds_commit_index = i; 224 list_add(&data->pages, list); 225 nreq++; 226 } 227 228 /* Clean up on error */ 229 pnfs_generic_retry_commit(cinfo, i); 230 return nreq; 231 } 232 233 static inline 234 void pnfs_fetch_commit_bucket_list(struct list_head *pages, 235 struct nfs_commit_data *data, 236 struct nfs_commit_info *cinfo) 237 { 238 struct pnfs_commit_bucket *bucket; 239 240 bucket = &cinfo->ds->buckets[data->ds_commit_index]; 241 spin_lock(cinfo->lock); 242 list_splice_init(&bucket->committing, pages); 243 data->lseg = bucket->clseg; 244 bucket->clseg = NULL; 245 spin_unlock(cinfo->lock); 246 247 } 248 249 /* This follows nfs_commit_list pretty closely */ 250 int 251 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 252 int how, struct nfs_commit_info *cinfo, 253 int (*initiate_commit)(struct nfs_commit_data *data, 254 int how)) 255 { 256 struct nfs_commit_data *data, *tmp; 257 LIST_HEAD(list); 258 unsigned int nreq = 0; 259 260 if (!list_empty(mds_pages)) { 261 data = nfs_commitdata_alloc(); 262 if (data != NULL) { 263 data->ds_commit_index = -1; 264 list_add(&data->pages, &list); 265 nreq++; 266 } else { 267 nfs_retry_commit(mds_pages, NULL, cinfo, 0); 268 pnfs_generic_retry_commit(cinfo, 0); 269 cinfo->completion_ops->error_cleanup(NFS_I(inode)); 270 return -ENOMEM; 271 } 272 } 273 274 nreq += pnfs_generic_alloc_ds_commits(cinfo, &list); 275 276 if (nreq == 0) { 277 cinfo->completion_ops->error_cleanup(NFS_I(inode)); 278 goto out; 279 } 280 281 atomic_add(nreq, &cinfo->mds->rpcs_out); 282 283 list_for_each_entry_safe(data, tmp, &list, pages) { 284 list_del_init(&data->pages); 285 if (data->ds_commit_index < 0) { 286 nfs_init_commit(data, mds_pages, NULL, cinfo); 287 nfs_initiate_commit(NFS_CLIENT(inode), data, 288 NFS_PROTO(data->inode), 289 data->mds_ops, how, 0); 290 } else { 291 LIST_HEAD(pages); 292 293 pnfs_fetch_commit_bucket_list(&pages, data, cinfo); 294 nfs_init_commit(data, &pages, data->lseg, cinfo); 295 initiate_commit(data, how); 296 } 297 } 298 out: 299 cinfo->ds->ncommitting = 0; 300 return PNFS_ATTEMPTED; 301 } 302 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); 303 304 /* 305 * Data server cache 306 * 307 * Data servers can be mapped to different device ids. 308 * nfs4_pnfs_ds reference counting 309 * - set to 1 on allocation 310 * - incremented when a device id maps a data server already in the cache. 311 * - decremented when deviceid is removed from the cache. 312 */ 313 static DEFINE_SPINLOCK(nfs4_ds_cache_lock); 314 static LIST_HEAD(nfs4_data_server_cache); 315 316 /* Debug routines */ 317 static void 318 print_ds(struct nfs4_pnfs_ds *ds) 319 { 320 if (ds == NULL) { 321 printk(KERN_WARNING "%s NULL device\n", __func__); 322 return; 323 } 324 printk(KERN_WARNING " ds %s\n" 325 " ref count %d\n" 326 " client %p\n" 327 " cl_exchange_flags %x\n", 328 ds->ds_remotestr, 329 atomic_read(&ds->ds_count), ds->ds_clp, 330 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); 331 } 332 333 static bool 334 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) 335 { 336 struct sockaddr_in *a, *b; 337 struct sockaddr_in6 *a6, *b6; 338 339 if (addr1->sa_family != addr2->sa_family) 340 return false; 341 342 switch (addr1->sa_family) { 343 case AF_INET: 344 a = (struct sockaddr_in *)addr1; 345 b = (struct sockaddr_in *)addr2; 346 347 if (a->sin_addr.s_addr == b->sin_addr.s_addr && 348 a->sin_port == b->sin_port) 349 return true; 350 break; 351 352 case AF_INET6: 353 a6 = (struct sockaddr_in6 *)addr1; 354 b6 = (struct sockaddr_in6 *)addr2; 355 356 /* LINKLOCAL addresses must have matching scope_id */ 357 if (ipv6_addr_src_scope(&a6->sin6_addr) == 358 IPV6_ADDR_SCOPE_LINKLOCAL && 359 a6->sin6_scope_id != b6->sin6_scope_id) 360 return false; 361 362 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && 363 a6->sin6_port == b6->sin6_port) 364 return true; 365 break; 366 367 default: 368 dprintk("%s: unhandled address family: %u\n", 369 __func__, addr1->sa_family); 370 return false; 371 } 372 373 return false; 374 } 375 376 /* 377 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, 378 * declare a match. 379 */ 380 static bool 381 _same_data_server_addrs_locked(const struct list_head *dsaddrs1, 382 const struct list_head *dsaddrs2) 383 { 384 struct nfs4_pnfs_ds_addr *da1, *da2; 385 struct sockaddr *sa1, *sa2; 386 bool match = false; 387 388 list_for_each_entry(da1, dsaddrs1, da_node) { 389 sa1 = (struct sockaddr *)&da1->da_addr; 390 match = false; 391 list_for_each_entry(da2, dsaddrs2, da_node) { 392 sa2 = (struct sockaddr *)&da2->da_addr; 393 match = same_sockaddr(sa1, sa2); 394 if (match) 395 break; 396 } 397 if (!match) 398 break; 399 } 400 return match; 401 } 402 403 /* 404 * Lookup DS by addresses. nfs4_ds_cache_lock is held 405 */ 406 static struct nfs4_pnfs_ds * 407 _data_server_lookup_locked(const struct list_head *dsaddrs) 408 { 409 struct nfs4_pnfs_ds *ds; 410 411 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) 412 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) 413 return ds; 414 return NULL; 415 } 416 417 static void destroy_ds(struct nfs4_pnfs_ds *ds) 418 { 419 struct nfs4_pnfs_ds_addr *da; 420 421 dprintk("--> %s\n", __func__); 422 ifdebug(FACILITY) 423 print_ds(ds); 424 425 nfs_put_client(ds->ds_clp); 426 427 while (!list_empty(&ds->ds_addrs)) { 428 da = list_first_entry(&ds->ds_addrs, 429 struct nfs4_pnfs_ds_addr, 430 da_node); 431 list_del_init(&da->da_node); 432 kfree(da->da_remotestr); 433 kfree(da); 434 } 435 436 kfree(ds->ds_remotestr); 437 kfree(ds); 438 } 439 440 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) 441 { 442 if (atomic_dec_and_lock(&ds->ds_count, 443 &nfs4_ds_cache_lock)) { 444 list_del_init(&ds->ds_node); 445 spin_unlock(&nfs4_ds_cache_lock); 446 destroy_ds(ds); 447 } 448 } 449 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); 450 451 /* 452 * Create a string with a human readable address and port to avoid 453 * complicated setup around many dprinks. 454 */ 455 static char * 456 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) 457 { 458 struct nfs4_pnfs_ds_addr *da; 459 char *remotestr; 460 size_t len; 461 char *p; 462 463 len = 3; /* '{', '}' and eol */ 464 list_for_each_entry(da, dsaddrs, da_node) { 465 len += strlen(da->da_remotestr) + 1; /* string plus comma */ 466 } 467 468 remotestr = kzalloc(len, gfp_flags); 469 if (!remotestr) 470 return NULL; 471 472 p = remotestr; 473 *(p++) = '{'; 474 len--; 475 list_for_each_entry(da, dsaddrs, da_node) { 476 size_t ll = strlen(da->da_remotestr); 477 478 if (ll > len) 479 goto out_err; 480 481 memcpy(p, da->da_remotestr, ll); 482 p += ll; 483 len -= ll; 484 485 if (len < 1) 486 goto out_err; 487 (*p++) = ','; 488 len--; 489 } 490 if (len < 2) 491 goto out_err; 492 *(p++) = '}'; 493 *p = '\0'; 494 return remotestr; 495 out_err: 496 kfree(remotestr); 497 return NULL; 498 } 499 500 /* 501 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if 502 * uncached and return cached struct nfs4_pnfs_ds. 503 */ 504 struct nfs4_pnfs_ds * 505 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) 506 { 507 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; 508 char *remotestr; 509 510 if (list_empty(dsaddrs)) { 511 dprintk("%s: no addresses defined\n", __func__); 512 goto out; 513 } 514 515 ds = kzalloc(sizeof(*ds), gfp_flags); 516 if (!ds) 517 goto out; 518 519 /* this is only used for debugging, so it's ok if its NULL */ 520 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); 521 522 spin_lock(&nfs4_ds_cache_lock); 523 tmp_ds = _data_server_lookup_locked(dsaddrs); 524 if (tmp_ds == NULL) { 525 INIT_LIST_HEAD(&ds->ds_addrs); 526 list_splice_init(dsaddrs, &ds->ds_addrs); 527 ds->ds_remotestr = remotestr; 528 atomic_set(&ds->ds_count, 1); 529 INIT_LIST_HEAD(&ds->ds_node); 530 ds->ds_clp = NULL; 531 list_add(&ds->ds_node, &nfs4_data_server_cache); 532 dprintk("%s add new data server %s\n", __func__, 533 ds->ds_remotestr); 534 } else { 535 kfree(remotestr); 536 kfree(ds); 537 atomic_inc(&tmp_ds->ds_count); 538 dprintk("%s data server %s found, inc'ed ds_count to %d\n", 539 __func__, tmp_ds->ds_remotestr, 540 atomic_read(&tmp_ds->ds_count)); 541 ds = tmp_ds; 542 } 543 spin_unlock(&nfs4_ds_cache_lock); 544 out: 545 return ds; 546 } 547 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); 548 549 static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) 550 { 551 might_sleep(); 552 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, 553 TASK_KILLABLE); 554 } 555 556 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) 557 { 558 smp_mb__before_atomic(); 559 clear_bit(NFS4DS_CONNECTING, &ds->ds_state); 560 smp_mb__after_atomic(); 561 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); 562 } 563 564 static struct nfs_client *(*get_v3_ds_connect)( 565 struct nfs_client *mds_clp, 566 const struct sockaddr *ds_addr, 567 int ds_addrlen, 568 int ds_proto, 569 unsigned int ds_timeo, 570 unsigned int ds_retrans, 571 rpc_authflavor_t au_flavor); 572 573 static bool load_v3_ds_connect(void) 574 { 575 if (!get_v3_ds_connect) { 576 get_v3_ds_connect = symbol_request(nfs3_set_ds_client); 577 WARN_ON_ONCE(!get_v3_ds_connect); 578 } 579 580 return(get_v3_ds_connect != NULL); 581 } 582 583 void nfs4_pnfs_v3_ds_connect_unload(void) 584 { 585 if (get_v3_ds_connect) { 586 symbol_put(nfs3_set_ds_client); 587 get_v3_ds_connect = NULL; 588 } 589 } 590 EXPORT_SYMBOL_GPL(nfs4_pnfs_v3_ds_connect_unload); 591 592 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, 593 struct nfs4_pnfs_ds *ds, 594 unsigned int timeo, 595 unsigned int retrans, 596 rpc_authflavor_t au_flavor) 597 { 598 struct nfs_client *clp = ERR_PTR(-EIO); 599 struct nfs4_pnfs_ds_addr *da; 600 int status = 0; 601 602 dprintk("--> %s DS %s au_flavor %d\n", __func__, 603 ds->ds_remotestr, au_flavor); 604 605 if (!load_v3_ds_connect()) 606 goto out; 607 608 list_for_each_entry(da, &ds->ds_addrs, da_node) { 609 dprintk("%s: DS %s: trying address %s\n", 610 __func__, ds->ds_remotestr, da->da_remotestr); 611 612 clp = get_v3_ds_connect(mds_srv->nfs_client, 613 (struct sockaddr *)&da->da_addr, 614 da->da_addrlen, IPPROTO_TCP, 615 timeo, retrans, au_flavor); 616 if (!IS_ERR(clp)) 617 break; 618 } 619 620 if (IS_ERR(clp)) { 621 status = PTR_ERR(clp); 622 goto out; 623 } 624 625 smp_wmb(); 626 ds->ds_clp = clp; 627 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 628 out: 629 return status; 630 } 631 632 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, 633 struct nfs4_pnfs_ds *ds, 634 unsigned int timeo, 635 unsigned int retrans, 636 u32 minor_version, 637 rpc_authflavor_t au_flavor) 638 { 639 struct nfs_client *clp = ERR_PTR(-EIO); 640 struct nfs4_pnfs_ds_addr *da; 641 int status = 0; 642 643 dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr, 644 au_flavor); 645 646 list_for_each_entry(da, &ds->ds_addrs, da_node) { 647 dprintk("%s: DS %s: trying address %s\n", 648 __func__, ds->ds_remotestr, da->da_remotestr); 649 650 clp = nfs4_set_ds_client(mds_srv->nfs_client, 651 (struct sockaddr *)&da->da_addr, 652 da->da_addrlen, IPPROTO_TCP, 653 timeo, retrans, minor_version, 654 au_flavor); 655 if (!IS_ERR(clp)) 656 break; 657 } 658 659 if (IS_ERR(clp)) { 660 status = PTR_ERR(clp); 661 goto out; 662 } 663 664 status = nfs4_init_ds_session(clp, mds_srv->nfs_client->cl_lease_time); 665 if (status) 666 goto out_put; 667 668 smp_wmb(); 669 ds->ds_clp = clp; 670 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 671 out: 672 return status; 673 out_put: 674 nfs_put_client(clp); 675 goto out; 676 } 677 678 /* 679 * Create an rpc connection to the nfs4_pnfs_ds data server. 680 * Currently only supports IPv4 and IPv6 addresses. 681 * If connection fails, make devid unavailable. 682 */ 683 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 684 struct nfs4_deviceid_node *devid, unsigned int timeo, 685 unsigned int retrans, u32 version, 686 u32 minor_version, rpc_authflavor_t au_flavor) 687 { 688 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { 689 int err = 0; 690 691 if (version == 3) { 692 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, 693 retrans, au_flavor); 694 } else if (version == 4) { 695 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, 696 retrans, minor_version, 697 au_flavor); 698 } else { 699 dprintk("%s: unsupported DS version %d\n", __func__, 700 version); 701 err = -EPROTONOSUPPORT; 702 } 703 704 if (err) 705 nfs4_mark_deviceid_unavailable(devid); 706 nfs4_clear_ds_conn_bit(ds); 707 } else { 708 nfs4_wait_ds_connect(ds); 709 } 710 } 711 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); 712 713 /* 714 * Currently only supports ipv4, ipv6 and one multi-path address. 715 */ 716 struct nfs4_pnfs_ds_addr * 717 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) 718 { 719 struct nfs4_pnfs_ds_addr *da = NULL; 720 char *buf, *portstr; 721 __be16 port; 722 int nlen, rlen; 723 int tmp[2]; 724 __be32 *p; 725 char *netid, *match_netid; 726 size_t len, match_netid_len; 727 char *startsep = ""; 728 char *endsep = ""; 729 730 731 /* r_netid */ 732 p = xdr_inline_decode(xdr, 4); 733 if (unlikely(!p)) 734 goto out_err; 735 nlen = be32_to_cpup(p++); 736 737 p = xdr_inline_decode(xdr, nlen); 738 if (unlikely(!p)) 739 goto out_err; 740 741 netid = kmalloc(nlen+1, gfp_flags); 742 if (unlikely(!netid)) 743 goto out_err; 744 745 netid[nlen] = '\0'; 746 memcpy(netid, p, nlen); 747 748 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ 749 p = xdr_inline_decode(xdr, 4); 750 if (unlikely(!p)) 751 goto out_free_netid; 752 rlen = be32_to_cpup(p); 753 754 p = xdr_inline_decode(xdr, rlen); 755 if (unlikely(!p)) 756 goto out_free_netid; 757 758 /* port is ".ABC.DEF", 8 chars max */ 759 if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { 760 dprintk("%s: Invalid address, length %d\n", __func__, 761 rlen); 762 goto out_free_netid; 763 } 764 buf = kmalloc(rlen + 1, gfp_flags); 765 if (!buf) { 766 dprintk("%s: Not enough memory\n", __func__); 767 goto out_free_netid; 768 } 769 buf[rlen] = '\0'; 770 memcpy(buf, p, rlen); 771 772 /* replace port '.' with '-' */ 773 portstr = strrchr(buf, '.'); 774 if (!portstr) { 775 dprintk("%s: Failed finding expected dot in port\n", 776 __func__); 777 goto out_free_buf; 778 } 779 *portstr = '-'; 780 781 /* find '.' between address and port */ 782 portstr = strrchr(buf, '.'); 783 if (!portstr) { 784 dprintk("%s: Failed finding expected dot between address and " 785 "port\n", __func__); 786 goto out_free_buf; 787 } 788 *portstr = '\0'; 789 790 da = kzalloc(sizeof(*da), gfp_flags); 791 if (unlikely(!da)) 792 goto out_free_buf; 793 794 INIT_LIST_HEAD(&da->da_node); 795 796 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, 797 sizeof(da->da_addr))) { 798 dprintk("%s: error parsing address %s\n", __func__, buf); 799 goto out_free_da; 800 } 801 802 portstr++; 803 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); 804 port = htons((tmp[0] << 8) | (tmp[1])); 805 806 switch (da->da_addr.ss_family) { 807 case AF_INET: 808 ((struct sockaddr_in *)&da->da_addr)->sin_port = port; 809 da->da_addrlen = sizeof(struct sockaddr_in); 810 match_netid = "tcp"; 811 match_netid_len = 3; 812 break; 813 814 case AF_INET6: 815 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; 816 da->da_addrlen = sizeof(struct sockaddr_in6); 817 match_netid = "tcp6"; 818 match_netid_len = 4; 819 startsep = "["; 820 endsep = "]"; 821 break; 822 823 default: 824 dprintk("%s: unsupported address family: %u\n", 825 __func__, da->da_addr.ss_family); 826 goto out_free_da; 827 } 828 829 if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { 830 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", 831 __func__, netid, match_netid); 832 goto out_free_da; 833 } 834 835 /* save human readable address */ 836 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; 837 da->da_remotestr = kzalloc(len, gfp_flags); 838 839 /* NULL is ok, only used for dprintk */ 840 if (da->da_remotestr) 841 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, 842 buf, endsep, ntohs(port)); 843 844 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); 845 kfree(buf); 846 kfree(netid); 847 return da; 848 849 out_free_da: 850 kfree(da); 851 out_free_buf: 852 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); 853 kfree(buf); 854 out_free_netid: 855 kfree(netid); 856 out_err: 857 return NULL; 858 } 859 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); 860 861 void 862 pnfs_layout_mark_request_commit(struct nfs_page *req, 863 struct pnfs_layout_segment *lseg, 864 struct nfs_commit_info *cinfo, 865 u32 ds_commit_idx) 866 { 867 struct list_head *list; 868 struct pnfs_commit_bucket *buckets; 869 870 spin_lock(cinfo->lock); 871 buckets = cinfo->ds->buckets; 872 list = &buckets[ds_commit_idx].written; 873 if (list_empty(list)) { 874 /* Non-empty buckets hold a reference on the lseg. That ref 875 * is normally transferred to the COMMIT call and released 876 * there. It could also be released if the last req is pulled 877 * off due to a rewrite, in which case it will be done in 878 * pnfs_common_clear_request_commit 879 */ 880 WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL); 881 buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg); 882 } 883 set_bit(PG_COMMIT_TO_DS, &req->wb_flags); 884 cinfo->ds->nwritten++; 885 886 nfs_request_add_commit_list_locked(req, list, cinfo); 887 spin_unlock(cinfo->lock); 888 nfs_mark_page_unstable(req->wb_page, cinfo); 889 } 890 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); 891 892 int 893 pnfs_nfs_generic_sync(struct inode *inode, bool datasync) 894 { 895 if (datasync) 896 return 0; 897 return pnfs_layoutcommit_inode(inode, true); 898 } 899 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); 900 901