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 return -ENOMEM; 270 } 271 } 272 273 nreq += pnfs_generic_alloc_ds_commits(cinfo, &list); 274 275 if (nreq == 0) 276 goto out; 277 278 atomic_add(nreq, &cinfo->mds->rpcs_out); 279 280 list_for_each_entry_safe(data, tmp, &list, pages) { 281 list_del_init(&data->pages); 282 if (data->ds_commit_index < 0) { 283 nfs_init_commit(data, mds_pages, NULL, cinfo); 284 nfs_initiate_commit(NFS_CLIENT(inode), data, 285 NFS_PROTO(data->inode), 286 data->mds_ops, how, 0); 287 } else { 288 LIST_HEAD(pages); 289 290 pnfs_fetch_commit_bucket_list(&pages, data, cinfo); 291 nfs_init_commit(data, &pages, data->lseg, cinfo); 292 initiate_commit(data, how); 293 } 294 } 295 out: 296 cinfo->ds->ncommitting = 0; 297 return PNFS_ATTEMPTED; 298 } 299 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); 300 301 /* 302 * Data server cache 303 * 304 * Data servers can be mapped to different device ids. 305 * nfs4_pnfs_ds reference counting 306 * - set to 1 on allocation 307 * - incremented when a device id maps a data server already in the cache. 308 * - decremented when deviceid is removed from the cache. 309 */ 310 static DEFINE_SPINLOCK(nfs4_ds_cache_lock); 311 static LIST_HEAD(nfs4_data_server_cache); 312 313 /* Debug routines */ 314 static void 315 print_ds(struct nfs4_pnfs_ds *ds) 316 { 317 if (ds == NULL) { 318 printk(KERN_WARNING "%s NULL device\n", __func__); 319 return; 320 } 321 printk(KERN_WARNING " ds %s\n" 322 " ref count %d\n" 323 " client %p\n" 324 " cl_exchange_flags %x\n", 325 ds->ds_remotestr, 326 atomic_read(&ds->ds_count), ds->ds_clp, 327 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); 328 } 329 330 static bool 331 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) 332 { 333 struct sockaddr_in *a, *b; 334 struct sockaddr_in6 *a6, *b6; 335 336 if (addr1->sa_family != addr2->sa_family) 337 return false; 338 339 switch (addr1->sa_family) { 340 case AF_INET: 341 a = (struct sockaddr_in *)addr1; 342 b = (struct sockaddr_in *)addr2; 343 344 if (a->sin_addr.s_addr == b->sin_addr.s_addr && 345 a->sin_port == b->sin_port) 346 return true; 347 break; 348 349 case AF_INET6: 350 a6 = (struct sockaddr_in6 *)addr1; 351 b6 = (struct sockaddr_in6 *)addr2; 352 353 /* LINKLOCAL addresses must have matching scope_id */ 354 if (ipv6_addr_src_scope(&a6->sin6_addr) == 355 IPV6_ADDR_SCOPE_LINKLOCAL && 356 a6->sin6_scope_id != b6->sin6_scope_id) 357 return false; 358 359 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && 360 a6->sin6_port == b6->sin6_port) 361 return true; 362 break; 363 364 default: 365 dprintk("%s: unhandled address family: %u\n", 366 __func__, addr1->sa_family); 367 return false; 368 } 369 370 return false; 371 } 372 373 /* 374 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, 375 * declare a match. 376 */ 377 static bool 378 _same_data_server_addrs_locked(const struct list_head *dsaddrs1, 379 const struct list_head *dsaddrs2) 380 { 381 struct nfs4_pnfs_ds_addr *da1, *da2; 382 struct sockaddr *sa1, *sa2; 383 bool match = false; 384 385 list_for_each_entry(da1, dsaddrs1, da_node) { 386 sa1 = (struct sockaddr *)&da1->da_addr; 387 match = false; 388 list_for_each_entry(da2, dsaddrs2, da_node) { 389 sa2 = (struct sockaddr *)&da2->da_addr; 390 match = same_sockaddr(sa1, sa2); 391 if (match) 392 break; 393 } 394 if (!match) 395 break; 396 } 397 return match; 398 } 399 400 /* 401 * Lookup DS by addresses. nfs4_ds_cache_lock is held 402 */ 403 static struct nfs4_pnfs_ds * 404 _data_server_lookup_locked(const struct list_head *dsaddrs) 405 { 406 struct nfs4_pnfs_ds *ds; 407 408 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) 409 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) 410 return ds; 411 return NULL; 412 } 413 414 static void destroy_ds(struct nfs4_pnfs_ds *ds) 415 { 416 struct nfs4_pnfs_ds_addr *da; 417 418 dprintk("--> %s\n", __func__); 419 ifdebug(FACILITY) 420 print_ds(ds); 421 422 nfs_put_client(ds->ds_clp); 423 424 while (!list_empty(&ds->ds_addrs)) { 425 da = list_first_entry(&ds->ds_addrs, 426 struct nfs4_pnfs_ds_addr, 427 da_node); 428 list_del_init(&da->da_node); 429 kfree(da->da_remotestr); 430 kfree(da); 431 } 432 433 kfree(ds->ds_remotestr); 434 kfree(ds); 435 } 436 437 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) 438 { 439 if (atomic_dec_and_lock(&ds->ds_count, 440 &nfs4_ds_cache_lock)) { 441 list_del_init(&ds->ds_node); 442 spin_unlock(&nfs4_ds_cache_lock); 443 destroy_ds(ds); 444 } 445 } 446 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); 447 448 /* 449 * Create a string with a human readable address and port to avoid 450 * complicated setup around many dprinks. 451 */ 452 static char * 453 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) 454 { 455 struct nfs4_pnfs_ds_addr *da; 456 char *remotestr; 457 size_t len; 458 char *p; 459 460 len = 3; /* '{', '}' and eol */ 461 list_for_each_entry(da, dsaddrs, da_node) { 462 len += strlen(da->da_remotestr) + 1; /* string plus comma */ 463 } 464 465 remotestr = kzalloc(len, gfp_flags); 466 if (!remotestr) 467 return NULL; 468 469 p = remotestr; 470 *(p++) = '{'; 471 len--; 472 list_for_each_entry(da, dsaddrs, da_node) { 473 size_t ll = strlen(da->da_remotestr); 474 475 if (ll > len) 476 goto out_err; 477 478 memcpy(p, da->da_remotestr, ll); 479 p += ll; 480 len -= ll; 481 482 if (len < 1) 483 goto out_err; 484 (*p++) = ','; 485 len--; 486 } 487 if (len < 2) 488 goto out_err; 489 *(p++) = '}'; 490 *p = '\0'; 491 return remotestr; 492 out_err: 493 kfree(remotestr); 494 return NULL; 495 } 496 497 /* 498 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if 499 * uncached and return cached struct nfs4_pnfs_ds. 500 */ 501 struct nfs4_pnfs_ds * 502 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) 503 { 504 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; 505 char *remotestr; 506 507 if (list_empty(dsaddrs)) { 508 dprintk("%s: no addresses defined\n", __func__); 509 goto out; 510 } 511 512 ds = kzalloc(sizeof(*ds), gfp_flags); 513 if (!ds) 514 goto out; 515 516 /* this is only used for debugging, so it's ok if its NULL */ 517 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); 518 519 spin_lock(&nfs4_ds_cache_lock); 520 tmp_ds = _data_server_lookup_locked(dsaddrs); 521 if (tmp_ds == NULL) { 522 INIT_LIST_HEAD(&ds->ds_addrs); 523 list_splice_init(dsaddrs, &ds->ds_addrs); 524 ds->ds_remotestr = remotestr; 525 atomic_set(&ds->ds_count, 1); 526 INIT_LIST_HEAD(&ds->ds_node); 527 ds->ds_clp = NULL; 528 list_add(&ds->ds_node, &nfs4_data_server_cache); 529 dprintk("%s add new data server %s\n", __func__, 530 ds->ds_remotestr); 531 } else { 532 kfree(remotestr); 533 kfree(ds); 534 atomic_inc(&tmp_ds->ds_count); 535 dprintk("%s data server %s found, inc'ed ds_count to %d\n", 536 __func__, tmp_ds->ds_remotestr, 537 atomic_read(&tmp_ds->ds_count)); 538 ds = tmp_ds; 539 } 540 spin_unlock(&nfs4_ds_cache_lock); 541 out: 542 return ds; 543 } 544 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); 545 546 static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) 547 { 548 might_sleep(); 549 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, 550 TASK_KILLABLE); 551 } 552 553 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) 554 { 555 smp_mb__before_atomic(); 556 clear_bit(NFS4DS_CONNECTING, &ds->ds_state); 557 smp_mb__after_atomic(); 558 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); 559 } 560 561 static struct nfs_client *(*get_v3_ds_connect)( 562 struct nfs_client *mds_clp, 563 const struct sockaddr *ds_addr, 564 int ds_addrlen, 565 int ds_proto, 566 unsigned int ds_timeo, 567 unsigned int ds_retrans, 568 rpc_authflavor_t au_flavor); 569 570 static bool load_v3_ds_connect(void) 571 { 572 if (!get_v3_ds_connect) { 573 get_v3_ds_connect = symbol_request(nfs3_set_ds_client); 574 WARN_ON_ONCE(!get_v3_ds_connect); 575 } 576 577 return(get_v3_ds_connect != NULL); 578 } 579 580 void nfs4_pnfs_v3_ds_connect_unload(void) 581 { 582 if (get_v3_ds_connect) { 583 symbol_put(nfs3_set_ds_client); 584 get_v3_ds_connect = NULL; 585 } 586 } 587 EXPORT_SYMBOL_GPL(nfs4_pnfs_v3_ds_connect_unload); 588 589 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, 590 struct nfs4_pnfs_ds *ds, 591 unsigned int timeo, 592 unsigned int retrans, 593 rpc_authflavor_t au_flavor) 594 { 595 struct nfs_client *clp = ERR_PTR(-EIO); 596 struct nfs4_pnfs_ds_addr *da; 597 int status = 0; 598 599 dprintk("--> %s DS %s au_flavor %d\n", __func__, 600 ds->ds_remotestr, au_flavor); 601 602 if (!load_v3_ds_connect()) 603 goto out; 604 605 list_for_each_entry(da, &ds->ds_addrs, da_node) { 606 dprintk("%s: DS %s: trying address %s\n", 607 __func__, ds->ds_remotestr, da->da_remotestr); 608 609 if (!IS_ERR(clp)) { 610 struct xprt_create xprt_args = { 611 .ident = XPRT_TRANSPORT_TCP, 612 .net = clp->cl_net, 613 .dstaddr = (struct sockaddr *)&da->da_addr, 614 .addrlen = da->da_addrlen, 615 .servername = clp->cl_hostname, 616 }; 617 /* Add this address as an alias */ 618 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 619 rpc_clnt_test_and_add_xprt, NULL); 620 } else 621 clp = get_v3_ds_connect(mds_srv->nfs_client, 622 (struct sockaddr *)&da->da_addr, 623 da->da_addrlen, IPPROTO_TCP, 624 timeo, retrans, au_flavor); 625 } 626 627 if (IS_ERR(clp)) { 628 status = PTR_ERR(clp); 629 goto out; 630 } 631 632 smp_wmb(); 633 ds->ds_clp = clp; 634 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 635 out: 636 return status; 637 } 638 639 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, 640 struct nfs4_pnfs_ds *ds, 641 unsigned int timeo, 642 unsigned int retrans, 643 u32 minor_version, 644 rpc_authflavor_t au_flavor) 645 { 646 struct nfs_client *clp = ERR_PTR(-EIO); 647 struct nfs4_pnfs_ds_addr *da; 648 int status = 0; 649 650 dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr, 651 au_flavor); 652 653 list_for_each_entry(da, &ds->ds_addrs, da_node) { 654 dprintk("%s: DS %s: trying address %s\n", 655 __func__, ds->ds_remotestr, da->da_remotestr); 656 657 clp = nfs4_set_ds_client(mds_srv->nfs_client, 658 (struct sockaddr *)&da->da_addr, 659 da->da_addrlen, IPPROTO_TCP, 660 timeo, retrans, minor_version, 661 au_flavor); 662 if (!IS_ERR(clp)) 663 break; 664 } 665 666 if (IS_ERR(clp)) { 667 status = PTR_ERR(clp); 668 goto out; 669 } 670 671 status = nfs4_init_ds_session(clp, mds_srv->nfs_client->cl_lease_time); 672 if (status) 673 goto out_put; 674 675 smp_wmb(); 676 ds->ds_clp = clp; 677 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); 678 out: 679 return status; 680 out_put: 681 nfs_put_client(clp); 682 goto out; 683 } 684 685 /* 686 * Create an rpc connection to the nfs4_pnfs_ds data server. 687 * Currently only supports IPv4 and IPv6 addresses. 688 * If connection fails, make devid unavailable. 689 */ 690 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 691 struct nfs4_deviceid_node *devid, unsigned int timeo, 692 unsigned int retrans, u32 version, 693 u32 minor_version, rpc_authflavor_t au_flavor) 694 { 695 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { 696 int err = 0; 697 698 if (version == 3) { 699 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, 700 retrans, au_flavor); 701 } else if (version == 4) { 702 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, 703 retrans, minor_version, 704 au_flavor); 705 } else { 706 dprintk("%s: unsupported DS version %d\n", __func__, 707 version); 708 err = -EPROTONOSUPPORT; 709 } 710 711 if (err) 712 nfs4_mark_deviceid_unavailable(devid); 713 nfs4_clear_ds_conn_bit(ds); 714 } else { 715 nfs4_wait_ds_connect(ds); 716 } 717 } 718 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); 719 720 /* 721 * Currently only supports ipv4, ipv6 and one multi-path address. 722 */ 723 struct nfs4_pnfs_ds_addr * 724 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) 725 { 726 struct nfs4_pnfs_ds_addr *da = NULL; 727 char *buf, *portstr; 728 __be16 port; 729 int nlen, rlen; 730 int tmp[2]; 731 __be32 *p; 732 char *netid, *match_netid; 733 size_t len, match_netid_len; 734 char *startsep = ""; 735 char *endsep = ""; 736 737 738 /* r_netid */ 739 p = xdr_inline_decode(xdr, 4); 740 if (unlikely(!p)) 741 goto out_err; 742 nlen = be32_to_cpup(p++); 743 744 p = xdr_inline_decode(xdr, nlen); 745 if (unlikely(!p)) 746 goto out_err; 747 748 netid = kmalloc(nlen+1, gfp_flags); 749 if (unlikely(!netid)) 750 goto out_err; 751 752 netid[nlen] = '\0'; 753 memcpy(netid, p, nlen); 754 755 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ 756 p = xdr_inline_decode(xdr, 4); 757 if (unlikely(!p)) 758 goto out_free_netid; 759 rlen = be32_to_cpup(p); 760 761 p = xdr_inline_decode(xdr, rlen); 762 if (unlikely(!p)) 763 goto out_free_netid; 764 765 /* port is ".ABC.DEF", 8 chars max */ 766 if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { 767 dprintk("%s: Invalid address, length %d\n", __func__, 768 rlen); 769 goto out_free_netid; 770 } 771 buf = kmalloc(rlen + 1, gfp_flags); 772 if (!buf) { 773 dprintk("%s: Not enough memory\n", __func__); 774 goto out_free_netid; 775 } 776 buf[rlen] = '\0'; 777 memcpy(buf, p, rlen); 778 779 /* replace port '.' with '-' */ 780 portstr = strrchr(buf, '.'); 781 if (!portstr) { 782 dprintk("%s: Failed finding expected dot in port\n", 783 __func__); 784 goto out_free_buf; 785 } 786 *portstr = '-'; 787 788 /* find '.' between address and port */ 789 portstr = strrchr(buf, '.'); 790 if (!portstr) { 791 dprintk("%s: Failed finding expected dot between address and " 792 "port\n", __func__); 793 goto out_free_buf; 794 } 795 *portstr = '\0'; 796 797 da = kzalloc(sizeof(*da), gfp_flags); 798 if (unlikely(!da)) 799 goto out_free_buf; 800 801 INIT_LIST_HEAD(&da->da_node); 802 803 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, 804 sizeof(da->da_addr))) { 805 dprintk("%s: error parsing address %s\n", __func__, buf); 806 goto out_free_da; 807 } 808 809 portstr++; 810 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); 811 port = htons((tmp[0] << 8) | (tmp[1])); 812 813 switch (da->da_addr.ss_family) { 814 case AF_INET: 815 ((struct sockaddr_in *)&da->da_addr)->sin_port = port; 816 da->da_addrlen = sizeof(struct sockaddr_in); 817 match_netid = "tcp"; 818 match_netid_len = 3; 819 break; 820 821 case AF_INET6: 822 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; 823 da->da_addrlen = sizeof(struct sockaddr_in6); 824 match_netid = "tcp6"; 825 match_netid_len = 4; 826 startsep = "["; 827 endsep = "]"; 828 break; 829 830 default: 831 dprintk("%s: unsupported address family: %u\n", 832 __func__, da->da_addr.ss_family); 833 goto out_free_da; 834 } 835 836 if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { 837 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", 838 __func__, netid, match_netid); 839 goto out_free_da; 840 } 841 842 /* save human readable address */ 843 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; 844 da->da_remotestr = kzalloc(len, gfp_flags); 845 846 /* NULL is ok, only used for dprintk */ 847 if (da->da_remotestr) 848 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, 849 buf, endsep, ntohs(port)); 850 851 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); 852 kfree(buf); 853 kfree(netid); 854 return da; 855 856 out_free_da: 857 kfree(da); 858 out_free_buf: 859 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); 860 kfree(buf); 861 out_free_netid: 862 kfree(netid); 863 out_err: 864 return NULL; 865 } 866 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); 867 868 void 869 pnfs_layout_mark_request_commit(struct nfs_page *req, 870 struct pnfs_layout_segment *lseg, 871 struct nfs_commit_info *cinfo, 872 u32 ds_commit_idx) 873 { 874 struct list_head *list; 875 struct pnfs_commit_bucket *buckets; 876 877 spin_lock(cinfo->lock); 878 buckets = cinfo->ds->buckets; 879 list = &buckets[ds_commit_idx].written; 880 if (list_empty(list)) { 881 if (!pnfs_is_valid_lseg(lseg)) { 882 spin_unlock(cinfo->lock); 883 cinfo->completion_ops->resched_write(cinfo, req); 884 return; 885 } 886 /* Non-empty buckets hold a reference on the lseg. That ref 887 * is normally transferred to the COMMIT call and released 888 * there. It could also be released if the last req is pulled 889 * off due to a rewrite, in which case it will be done in 890 * pnfs_common_clear_request_commit 891 */ 892 WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL); 893 buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg); 894 } 895 set_bit(PG_COMMIT_TO_DS, &req->wb_flags); 896 cinfo->ds->nwritten++; 897 898 nfs_request_add_commit_list_locked(req, list, cinfo); 899 spin_unlock(cinfo->lock); 900 nfs_mark_page_unstable(req->wb_page, cinfo); 901 } 902 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); 903 904 int 905 pnfs_nfs_generic_sync(struct inode *inode, bool datasync) 906 { 907 if (datasync) 908 return 0; 909 return pnfs_layoutcommit_inode(inode, true); 910 } 911 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); 912 913