1 /* 2 * Module for pnfs flexfile layout driver. 3 * 4 * Copyright (c) 2014, Primary Data, Inc. All rights reserved. 5 * 6 * Tao Peng <bergwolf@primarydata.com> 7 */ 8 9 #include <linux/nfs_fs.h> 10 #include <linux/nfs_page.h> 11 #include <linux/module.h> 12 13 #include <linux/sunrpc/metrics.h> 14 15 #include "flexfilelayout.h" 16 #include "../nfs4session.h" 17 #include "../nfs4idmap.h" 18 #include "../internal.h" 19 #include "../delegation.h" 20 #include "../nfs4trace.h" 21 #include "../iostat.h" 22 #include "../nfs.h" 23 #include "../nfs42.h" 24 25 #define NFSDBG_FACILITY NFSDBG_PNFS_LD 26 27 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ) 28 29 static struct group_info *ff_zero_group; 30 31 static struct pnfs_layout_hdr * 32 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 33 { 34 struct nfs4_flexfile_layout *ffl; 35 36 ffl = kzalloc(sizeof(*ffl), gfp_flags); 37 if (ffl) { 38 INIT_LIST_HEAD(&ffl->error_list); 39 INIT_LIST_HEAD(&ffl->mirrors); 40 return &ffl->generic_hdr; 41 } else 42 return NULL; 43 } 44 45 static void 46 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo) 47 { 48 struct nfs4_ff_layout_ds_err *err, *n; 49 50 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list, 51 list) { 52 list_del(&err->list); 53 kfree(err); 54 } 55 kfree(FF_LAYOUT_FROM_HDR(lo)); 56 } 57 58 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 59 { 60 __be32 *p; 61 62 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 63 if (unlikely(p == NULL)) 64 return -ENOBUFS; 65 stateid->type = NFS4_PNFS_DS_STATEID_TYPE; 66 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 67 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__, 68 p[0], p[1], p[2], p[3]); 69 return 0; 70 } 71 72 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid) 73 { 74 __be32 *p; 75 76 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE); 77 if (unlikely(!p)) 78 return -ENOBUFS; 79 memcpy(devid, p, NFS4_DEVICEID4_SIZE); 80 nfs4_print_deviceid(devid); 81 return 0; 82 } 83 84 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 85 { 86 __be32 *p; 87 88 p = xdr_inline_decode(xdr, 4); 89 if (unlikely(!p)) 90 return -ENOBUFS; 91 fh->size = be32_to_cpup(p++); 92 if (fh->size > sizeof(struct nfs_fh)) { 93 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n", 94 fh->size); 95 return -EOVERFLOW; 96 } 97 /* fh.data */ 98 p = xdr_inline_decode(xdr, fh->size); 99 if (unlikely(!p)) 100 return -ENOBUFS; 101 memcpy(&fh->data, p, fh->size); 102 dprintk("%s: fh len %d\n", __func__, fh->size); 103 104 return 0; 105 } 106 107 /* 108 * Currently only stringified uids and gids are accepted. 109 * I.e., kerberos is not supported to the DSes, so no pricipals. 110 * 111 * That means that one common function will suffice, but when 112 * principals are added, this should be split to accomodate 113 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid(). 114 */ 115 static int 116 decode_name(struct xdr_stream *xdr, u32 *id) 117 { 118 __be32 *p; 119 int len; 120 121 /* opaque_length(4)*/ 122 p = xdr_inline_decode(xdr, 4); 123 if (unlikely(!p)) 124 return -ENOBUFS; 125 len = be32_to_cpup(p++); 126 if (len < 0) 127 return -EINVAL; 128 129 dprintk("%s: len %u\n", __func__, len); 130 131 /* opaque body */ 132 p = xdr_inline_decode(xdr, len); 133 if (unlikely(!p)) 134 return -ENOBUFS; 135 136 if (!nfs_map_string_to_numeric((char *)p, len, id)) 137 return -EINVAL; 138 139 return 0; 140 } 141 142 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1, 143 const struct nfs4_ff_layout_mirror *m2) 144 { 145 int i, j; 146 147 if (m1->fh_versions_cnt != m2->fh_versions_cnt) 148 return false; 149 for (i = 0; i < m1->fh_versions_cnt; i++) { 150 bool found_fh = false; 151 for (j = 0; j < m2->fh_versions_cnt; j++) { 152 if (nfs_compare_fh(&m1->fh_versions[i], 153 &m2->fh_versions[j]) == 0) { 154 found_fh = true; 155 break; 156 } 157 } 158 if (!found_fh) 159 return false; 160 } 161 return true; 162 } 163 164 static struct nfs4_ff_layout_mirror * 165 ff_layout_add_mirror(struct pnfs_layout_hdr *lo, 166 struct nfs4_ff_layout_mirror *mirror) 167 { 168 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 169 struct nfs4_ff_layout_mirror *pos; 170 struct inode *inode = lo->plh_inode; 171 172 spin_lock(&inode->i_lock); 173 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) { 174 if (mirror->mirror_ds != pos->mirror_ds) 175 continue; 176 if (!ff_mirror_match_fh(mirror, pos)) 177 continue; 178 if (atomic_inc_not_zero(&pos->ref)) { 179 spin_unlock(&inode->i_lock); 180 return pos; 181 } 182 } 183 list_add(&mirror->mirrors, &ff_layout->mirrors); 184 mirror->layout = lo; 185 spin_unlock(&inode->i_lock); 186 return mirror; 187 } 188 189 static void 190 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror) 191 { 192 struct inode *inode; 193 if (mirror->layout == NULL) 194 return; 195 inode = mirror->layout->plh_inode; 196 spin_lock(&inode->i_lock); 197 list_del(&mirror->mirrors); 198 spin_unlock(&inode->i_lock); 199 mirror->layout = NULL; 200 } 201 202 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags) 203 { 204 struct nfs4_ff_layout_mirror *mirror; 205 206 mirror = kzalloc(sizeof(*mirror), gfp_flags); 207 if (mirror != NULL) { 208 spin_lock_init(&mirror->lock); 209 atomic_set(&mirror->ref, 1); 210 INIT_LIST_HEAD(&mirror->mirrors); 211 } 212 return mirror; 213 } 214 215 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror) 216 { 217 struct rpc_cred *cred; 218 219 ff_layout_remove_mirror(mirror); 220 kfree(mirror->fh_versions); 221 cred = rcu_access_pointer(mirror->ro_cred); 222 if (cred) 223 put_rpccred(cred); 224 cred = rcu_access_pointer(mirror->rw_cred); 225 if (cred) 226 put_rpccred(cred); 227 nfs4_ff_layout_put_deviceid(mirror->mirror_ds); 228 kfree(mirror); 229 } 230 231 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror) 232 { 233 if (mirror != NULL && atomic_dec_and_test(&mirror->ref)) 234 ff_layout_free_mirror(mirror); 235 } 236 237 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls) 238 { 239 int i; 240 241 if (fls->mirror_array) { 242 for (i = 0; i < fls->mirror_array_cnt; i++) { 243 /* normally mirror_ds is freed in 244 * .free_deviceid_node but we still do it here 245 * for .alloc_lseg error path */ 246 ff_layout_put_mirror(fls->mirror_array[i]); 247 } 248 kfree(fls->mirror_array); 249 fls->mirror_array = NULL; 250 } 251 } 252 253 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr) 254 { 255 int ret = 0; 256 257 dprintk("--> %s\n", __func__); 258 259 /* FIXME: remove this check when layout segment support is added */ 260 if (lgr->range.offset != 0 || 261 lgr->range.length != NFS4_MAX_UINT64) { 262 dprintk("%s Only whole file layouts supported. Use MDS i/o\n", 263 __func__); 264 ret = -EINVAL; 265 } 266 267 dprintk("--> %s returns %d\n", __func__, ret); 268 return ret; 269 } 270 271 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls) 272 { 273 if (fls) { 274 ff_layout_free_mirror_array(fls); 275 kfree(fls); 276 } 277 } 278 279 static bool 280 ff_lseg_range_is_after(const struct pnfs_layout_range *l1, 281 const struct pnfs_layout_range *l2) 282 { 283 u64 end1, end2; 284 285 if (l1->iomode != l2->iomode) 286 return l1->iomode != IOMODE_READ; 287 end1 = pnfs_calc_offset_end(l1->offset, l1->length); 288 end2 = pnfs_calc_offset_end(l2->offset, l2->length); 289 if (end1 < l2->offset) 290 return false; 291 if (end2 < l1->offset) 292 return true; 293 return l2->offset <= l1->offset; 294 } 295 296 static bool 297 ff_lseg_merge(struct pnfs_layout_segment *new, 298 struct pnfs_layout_segment *old) 299 { 300 u64 new_end, old_end; 301 302 if (new->pls_range.iomode != old->pls_range.iomode) 303 return false; 304 old_end = pnfs_calc_offset_end(old->pls_range.offset, 305 old->pls_range.length); 306 if (old_end < new->pls_range.offset) 307 return false; 308 new_end = pnfs_calc_offset_end(new->pls_range.offset, 309 new->pls_range.length); 310 if (new_end < old->pls_range.offset) 311 return false; 312 313 /* Mergeable: copy info from 'old' to 'new' */ 314 if (new_end < old_end) 315 new_end = old_end; 316 if (new->pls_range.offset < old->pls_range.offset) 317 new->pls_range.offset = old->pls_range.offset; 318 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset, 319 new_end); 320 if (test_bit(NFS_LSEG_ROC, &old->pls_flags)) 321 set_bit(NFS_LSEG_ROC, &new->pls_flags); 322 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags)) 323 set_bit(NFS_LSEG_LAYOUTRETURN, &new->pls_flags); 324 return true; 325 } 326 327 static void 328 ff_layout_add_lseg(struct pnfs_layout_hdr *lo, 329 struct pnfs_layout_segment *lseg, 330 struct list_head *free_me) 331 { 332 pnfs_generic_layout_insert_lseg(lo, lseg, 333 ff_lseg_range_is_after, 334 ff_lseg_merge, 335 free_me); 336 } 337 338 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls) 339 { 340 int i, j; 341 342 for (i = 0; i < fls->mirror_array_cnt - 1; i++) { 343 for (j = i + 1; j < fls->mirror_array_cnt; j++) 344 if (fls->mirror_array[i]->efficiency < 345 fls->mirror_array[j]->efficiency) 346 swap(fls->mirror_array[i], 347 fls->mirror_array[j]); 348 } 349 } 350 351 static void ff_layout_mark_devices_valid(struct nfs4_ff_layout_segment *fls) 352 { 353 struct nfs4_deviceid_node *node; 354 int i; 355 356 if (!(fls->flags & FF_FLAGS_NO_IO_THRU_MDS)) 357 return; 358 for (i = 0; i < fls->mirror_array_cnt; i++) { 359 node = &fls->mirror_array[i]->mirror_ds->id_node; 360 clear_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags); 361 } 362 } 363 364 static struct pnfs_layout_segment * 365 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh, 366 struct nfs4_layoutget_res *lgr, 367 gfp_t gfp_flags) 368 { 369 struct pnfs_layout_segment *ret; 370 struct nfs4_ff_layout_segment *fls = NULL; 371 struct xdr_stream stream; 372 struct xdr_buf buf; 373 struct page *scratch; 374 u64 stripe_unit; 375 u32 mirror_array_cnt; 376 __be32 *p; 377 int i, rc; 378 379 dprintk("--> %s\n", __func__); 380 scratch = alloc_page(gfp_flags); 381 if (!scratch) 382 return ERR_PTR(-ENOMEM); 383 384 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, 385 lgr->layoutp->len); 386 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 387 388 /* stripe unit and mirror_array_cnt */ 389 rc = -EIO; 390 p = xdr_inline_decode(&stream, 8 + 4); 391 if (!p) 392 goto out_err_free; 393 394 p = xdr_decode_hyper(p, &stripe_unit); 395 mirror_array_cnt = be32_to_cpup(p++); 396 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__, 397 stripe_unit, mirror_array_cnt); 398 399 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT || 400 mirror_array_cnt == 0) 401 goto out_err_free; 402 403 rc = -ENOMEM; 404 fls = kzalloc(sizeof(*fls), gfp_flags); 405 if (!fls) 406 goto out_err_free; 407 408 fls->mirror_array_cnt = mirror_array_cnt; 409 fls->stripe_unit = stripe_unit; 410 fls->mirror_array = kcalloc(fls->mirror_array_cnt, 411 sizeof(fls->mirror_array[0]), gfp_flags); 412 if (fls->mirror_array == NULL) 413 goto out_err_free; 414 415 for (i = 0; i < fls->mirror_array_cnt; i++) { 416 struct nfs4_ff_layout_mirror *mirror; 417 struct nfs4_deviceid devid; 418 struct nfs4_deviceid_node *idnode; 419 struct auth_cred acred = { .group_info = ff_zero_group }; 420 struct rpc_cred __rcu *cred; 421 u32 ds_count, fh_count, id; 422 int j; 423 424 rc = -EIO; 425 p = xdr_inline_decode(&stream, 4); 426 if (!p) 427 goto out_err_free; 428 ds_count = be32_to_cpup(p); 429 430 /* FIXME: allow for striping? */ 431 if (ds_count != 1) 432 goto out_err_free; 433 434 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags); 435 if (fls->mirror_array[i] == NULL) { 436 rc = -ENOMEM; 437 goto out_err_free; 438 } 439 440 fls->mirror_array[i]->ds_count = ds_count; 441 442 /* deviceid */ 443 rc = decode_deviceid(&stream, &devid); 444 if (rc) 445 goto out_err_free; 446 447 idnode = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode), 448 &devid, lh->plh_lc_cred, 449 gfp_flags); 450 /* 451 * upon success, mirror_ds is allocated by previous 452 * getdeviceinfo, or newly by .alloc_deviceid_node 453 * nfs4_find_get_deviceid failure is indeed getdeviceinfo falure 454 */ 455 if (idnode) 456 fls->mirror_array[i]->mirror_ds = 457 FF_LAYOUT_MIRROR_DS(idnode); 458 else 459 goto out_err_free; 460 461 /* efficiency */ 462 rc = -EIO; 463 p = xdr_inline_decode(&stream, 4); 464 if (!p) 465 goto out_err_free; 466 fls->mirror_array[i]->efficiency = be32_to_cpup(p); 467 468 /* stateid */ 469 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid); 470 if (rc) 471 goto out_err_free; 472 473 /* fh */ 474 p = xdr_inline_decode(&stream, 4); 475 if (!p) 476 goto out_err_free; 477 fh_count = be32_to_cpup(p); 478 479 fls->mirror_array[i]->fh_versions = 480 kzalloc(fh_count * sizeof(struct nfs_fh), 481 gfp_flags); 482 if (fls->mirror_array[i]->fh_versions == NULL) { 483 rc = -ENOMEM; 484 goto out_err_free; 485 } 486 487 for (j = 0; j < fh_count; j++) { 488 rc = decode_nfs_fh(&stream, 489 &fls->mirror_array[i]->fh_versions[j]); 490 if (rc) 491 goto out_err_free; 492 } 493 494 fls->mirror_array[i]->fh_versions_cnt = fh_count; 495 496 /* user */ 497 rc = decode_name(&stream, &id); 498 if (rc) 499 goto out_err_free; 500 501 acred.uid = make_kuid(&init_user_ns, id); 502 503 /* group */ 504 rc = decode_name(&stream, &id); 505 if (rc) 506 goto out_err_free; 507 508 acred.gid = make_kgid(&init_user_ns, id); 509 510 /* find the cred for it */ 511 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags)); 512 if (IS_ERR(cred)) { 513 rc = PTR_ERR(cred); 514 goto out_err_free; 515 } 516 517 if (lgr->range.iomode == IOMODE_READ) 518 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 519 else 520 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 521 522 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]); 523 if (mirror != fls->mirror_array[i]) { 524 /* swap cred ptrs so free_mirror will clean up old */ 525 if (lgr->range.iomode == IOMODE_READ) { 526 cred = xchg(&mirror->ro_cred, cred); 527 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 528 } else { 529 cred = xchg(&mirror->rw_cred, cred); 530 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 531 } 532 ff_layout_free_mirror(fls->mirror_array[i]); 533 fls->mirror_array[i] = mirror; 534 } 535 536 dprintk("%s: iomode %s uid %u gid %u\n", __func__, 537 lgr->range.iomode == IOMODE_READ ? "READ" : "RW", 538 from_kuid(&init_user_ns, acred.uid), 539 from_kgid(&init_user_ns, acred.gid)); 540 } 541 542 p = xdr_inline_decode(&stream, 4); 543 if (!p) 544 goto out_sort_mirrors; 545 fls->flags = be32_to_cpup(p); 546 547 p = xdr_inline_decode(&stream, 4); 548 if (!p) 549 goto out_sort_mirrors; 550 for (i=0; i < fls->mirror_array_cnt; i++) 551 fls->mirror_array[i]->report_interval = be32_to_cpup(p); 552 553 out_sort_mirrors: 554 ff_layout_sort_mirrors(fls); 555 rc = ff_layout_check_layout(lgr); 556 if (rc) 557 goto out_err_free; 558 ff_layout_mark_devices_valid(fls); 559 560 ret = &fls->generic_hdr; 561 dprintk("<-- %s (success)\n", __func__); 562 out_free_page: 563 __free_page(scratch); 564 return ret; 565 out_err_free: 566 _ff_layout_free_lseg(fls); 567 ret = ERR_PTR(rc); 568 dprintk("<-- %s (%d)\n", __func__, rc); 569 goto out_free_page; 570 } 571 572 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout) 573 { 574 struct pnfs_layout_segment *lseg; 575 576 list_for_each_entry(lseg, &layout->plh_segs, pls_list) 577 if (lseg->pls_range.iomode == IOMODE_RW) 578 return true; 579 580 return false; 581 } 582 583 static void 584 ff_layout_free_lseg(struct pnfs_layout_segment *lseg) 585 { 586 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 587 588 dprintk("--> %s\n", __func__); 589 590 if (lseg->pls_range.iomode == IOMODE_RW) { 591 struct nfs4_flexfile_layout *ffl; 592 struct inode *inode; 593 594 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout); 595 inode = ffl->generic_hdr.plh_inode; 596 spin_lock(&inode->i_lock); 597 if (!ff_layout_has_rw_segments(lseg->pls_layout)) { 598 ffl->commit_info.nbuckets = 0; 599 kfree(ffl->commit_info.buckets); 600 ffl->commit_info.buckets = NULL; 601 } 602 spin_unlock(&inode->i_lock); 603 } 604 _ff_layout_free_lseg(fls); 605 } 606 607 /* Return 1 until we have multiple lsegs support */ 608 static int 609 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls) 610 { 611 return 1; 612 } 613 614 static void 615 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 616 { 617 /* first IO request? */ 618 if (atomic_inc_return(&timer->n_ops) == 1) { 619 timer->start_time = now; 620 } 621 } 622 623 static ktime_t 624 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 625 { 626 ktime_t start; 627 628 if (atomic_dec_return(&timer->n_ops) < 0) 629 WARN_ON_ONCE(1); 630 631 start = timer->start_time; 632 timer->start_time = now; 633 return ktime_sub(now, start); 634 } 635 636 static bool 637 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 638 struct nfs4_ff_layoutstat *layoutstat, 639 ktime_t now) 640 { 641 static const ktime_t notime = {0}; 642 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL; 643 644 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now); 645 if (ktime_equal(mirror->start_time, notime)) 646 mirror->start_time = now; 647 if (ktime_equal(mirror->last_report_time, notime)) 648 mirror->last_report_time = now; 649 if (mirror->report_interval != 0) 650 report_interval = (s64)mirror->report_interval * 1000LL; 651 else if (layoutstats_timer != 0) 652 report_interval = (s64)layoutstats_timer * 1000LL; 653 if (ktime_to_ms(ktime_sub(now, mirror->last_report_time)) >= 654 report_interval) { 655 mirror->last_report_time = now; 656 return true; 657 } 658 659 return false; 660 } 661 662 static void 663 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat, 664 __u64 requested) 665 { 666 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 667 668 iostat->ops_requested++; 669 iostat->bytes_requested += requested; 670 } 671 672 static void 673 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat, 674 __u64 requested, 675 __u64 completed, 676 ktime_t time_completed, 677 ktime_t time_started) 678 { 679 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 680 ktime_t completion_time = ktime_sub(time_completed, time_started); 681 ktime_t timer; 682 683 iostat->ops_completed++; 684 iostat->bytes_completed += completed; 685 iostat->bytes_not_delivered += requested - completed; 686 687 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed); 688 iostat->total_busy_time = 689 ktime_add(iostat->total_busy_time, timer); 690 iostat->aggregate_completion_time = 691 ktime_add(iostat->aggregate_completion_time, 692 completion_time); 693 } 694 695 static void 696 nfs4_ff_layout_stat_io_start_read(struct inode *inode, 697 struct nfs4_ff_layout_mirror *mirror, 698 __u64 requested, ktime_t now) 699 { 700 bool report; 701 702 spin_lock(&mirror->lock); 703 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now); 704 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested); 705 spin_unlock(&mirror->lock); 706 707 if (report) 708 pnfs_report_layoutstat(inode, GFP_KERNEL); 709 } 710 711 static void 712 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task, 713 struct nfs4_ff_layout_mirror *mirror, 714 __u64 requested, 715 __u64 completed) 716 { 717 spin_lock(&mirror->lock); 718 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat, 719 requested, completed, 720 ktime_get(), task->tk_start); 721 spin_unlock(&mirror->lock); 722 } 723 724 static void 725 nfs4_ff_layout_stat_io_start_write(struct inode *inode, 726 struct nfs4_ff_layout_mirror *mirror, 727 __u64 requested, ktime_t now) 728 { 729 bool report; 730 731 spin_lock(&mirror->lock); 732 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now); 733 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested); 734 spin_unlock(&mirror->lock); 735 736 if (report) 737 pnfs_report_layoutstat(inode, GFP_NOIO); 738 } 739 740 static void 741 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, 742 struct nfs4_ff_layout_mirror *mirror, 743 __u64 requested, 744 __u64 completed, 745 enum nfs3_stable_how committed) 746 { 747 if (committed == NFS_UNSTABLE) 748 requested = completed = 0; 749 750 spin_lock(&mirror->lock); 751 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat, 752 requested, completed, ktime_get(), task->tk_start); 753 spin_unlock(&mirror->lock); 754 } 755 756 static int 757 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg, 758 struct nfs_commit_info *cinfo, 759 gfp_t gfp_flags) 760 { 761 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 762 struct pnfs_commit_bucket *buckets; 763 int size; 764 765 if (cinfo->ds->nbuckets != 0) { 766 /* This assumes there is only one RW lseg per file. 767 * To support multiple lseg per file, we need to 768 * change struct pnfs_commit_bucket to allow dynamic 769 * increasing nbuckets. 770 */ 771 return 0; 772 } 773 774 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg); 775 776 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket), 777 gfp_flags); 778 if (!buckets) 779 return -ENOMEM; 780 else { 781 int i; 782 783 spin_lock(&cinfo->inode->i_lock); 784 if (cinfo->ds->nbuckets != 0) 785 kfree(buckets); 786 else { 787 cinfo->ds->buckets = buckets; 788 cinfo->ds->nbuckets = size; 789 for (i = 0; i < size; i++) { 790 INIT_LIST_HEAD(&buckets[i].written); 791 INIT_LIST_HEAD(&buckets[i].committing); 792 /* mark direct verifier as unset */ 793 buckets[i].direct_verf.committed = 794 NFS_INVALID_STABLE_HOW; 795 } 796 } 797 spin_unlock(&cinfo->inode->i_lock); 798 return 0; 799 } 800 } 801 802 static struct nfs4_pnfs_ds * 803 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 804 int start_idx, 805 int *best_idx) 806 { 807 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 808 struct nfs4_pnfs_ds *ds; 809 int idx; 810 811 /* mirrors are sorted by efficiency */ 812 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 813 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false); 814 if (ds) { 815 *best_idx = idx; 816 return ds; 817 } 818 } 819 820 return NULL; 821 } 822 823 static void 824 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 825 struct nfs_page *req) 826 { 827 struct nfs_pgio_mirror *pgm; 828 struct nfs4_ff_layout_mirror *mirror; 829 struct nfs4_pnfs_ds *ds; 830 int ds_idx; 831 832 /* Use full layout for now */ 833 if (!pgio->pg_lseg) { 834 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 835 req->wb_context, 836 0, 837 NFS4_MAX_UINT64, 838 IOMODE_READ, 839 GFP_KERNEL); 840 if (IS_ERR(pgio->pg_lseg)) { 841 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 842 pgio->pg_lseg = NULL; 843 return; 844 } 845 } 846 /* If no lseg, fall back to read through mds */ 847 if (pgio->pg_lseg == NULL) 848 goto out_mds; 849 850 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx); 851 if (!ds) 852 goto out_mds; 853 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 854 855 pgio->pg_mirror_idx = ds_idx; 856 857 /* read always uses only one mirror - idx 0 for pgio layer */ 858 pgm = &pgio->pg_mirrors[0]; 859 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; 860 861 return; 862 out_mds: 863 pnfs_put_lseg(pgio->pg_lseg); 864 pgio->pg_lseg = NULL; 865 nfs_pageio_reset_read_mds(pgio); 866 } 867 868 static void 869 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 870 struct nfs_page *req) 871 { 872 struct nfs4_ff_layout_mirror *mirror; 873 struct nfs_pgio_mirror *pgm; 874 struct nfs_commit_info cinfo; 875 struct nfs4_pnfs_ds *ds; 876 int i; 877 int status; 878 879 if (!pgio->pg_lseg) { 880 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 881 req->wb_context, 882 0, 883 NFS4_MAX_UINT64, 884 IOMODE_RW, 885 GFP_NOFS); 886 if (IS_ERR(pgio->pg_lseg)) { 887 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 888 pgio->pg_lseg = NULL; 889 return; 890 } 891 } 892 /* If no lseg, fall back to write through mds */ 893 if (pgio->pg_lseg == NULL) 894 goto out_mds; 895 896 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq); 897 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS); 898 if (status < 0) 899 goto out_mds; 900 901 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 902 if (WARN_ON_ONCE(pgio->pg_mirror_count != 903 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))) 904 goto out_mds; 905 906 for (i = 0; i < pgio->pg_mirror_count; i++) { 907 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true); 908 if (!ds) 909 goto out_mds; 910 pgm = &pgio->pg_mirrors[i]; 911 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 912 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize; 913 } 914 915 return; 916 917 out_mds: 918 pnfs_put_lseg(pgio->pg_lseg); 919 pgio->pg_lseg = NULL; 920 nfs_pageio_reset_write_mds(pgio); 921 } 922 923 static unsigned int 924 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 925 struct nfs_page *req) 926 { 927 if (!pgio->pg_lseg) { 928 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 929 req->wb_context, 930 0, 931 NFS4_MAX_UINT64, 932 IOMODE_RW, 933 GFP_NOFS); 934 if (IS_ERR(pgio->pg_lseg)) { 935 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 936 pgio->pg_lseg = NULL; 937 goto out; 938 } 939 } 940 if (pgio->pg_lseg) 941 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 942 943 /* no lseg means that pnfs is not in use, so no mirroring here */ 944 nfs_pageio_reset_write_mds(pgio); 945 out: 946 return 1; 947 } 948 949 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 950 .pg_init = ff_layout_pg_init_read, 951 .pg_test = pnfs_generic_pg_test, 952 .pg_doio = pnfs_generic_pg_readpages, 953 .pg_cleanup = pnfs_generic_pg_cleanup, 954 }; 955 956 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 957 .pg_init = ff_layout_pg_init_write, 958 .pg_test = pnfs_generic_pg_test, 959 .pg_doio = pnfs_generic_pg_writepages, 960 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 961 .pg_cleanup = pnfs_generic_pg_cleanup, 962 }; 963 964 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 965 { 966 struct rpc_task *task = &hdr->task; 967 968 pnfs_layoutcommit_inode(hdr->inode, false); 969 970 if (retry_pnfs) { 971 dprintk("%s Reset task %5u for i/o through pNFS " 972 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 973 hdr->task.tk_pid, 974 hdr->inode->i_sb->s_id, 975 (unsigned long long)NFS_FILEID(hdr->inode), 976 hdr->args.count, 977 (unsigned long long)hdr->args.offset); 978 979 hdr->completion_ops->reschedule_io(hdr); 980 return; 981 } 982 983 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 984 dprintk("%s Reset task %5u for i/o through MDS " 985 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 986 hdr->task.tk_pid, 987 hdr->inode->i_sb->s_id, 988 (unsigned long long)NFS_FILEID(hdr->inode), 989 hdr->args.count, 990 (unsigned long long)hdr->args.offset); 991 992 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 993 } 994 } 995 996 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 997 { 998 struct rpc_task *task = &hdr->task; 999 1000 pnfs_layoutcommit_inode(hdr->inode, false); 1001 1002 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1003 dprintk("%s Reset task %5u for i/o through MDS " 1004 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1005 hdr->task.tk_pid, 1006 hdr->inode->i_sb->s_id, 1007 (unsigned long long)NFS_FILEID(hdr->inode), 1008 hdr->args.count, 1009 (unsigned long long)hdr->args.offset); 1010 1011 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1012 } 1013 } 1014 1015 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1016 struct nfs4_state *state, 1017 struct nfs_client *clp, 1018 struct pnfs_layout_segment *lseg, 1019 int idx) 1020 { 1021 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1022 struct inode *inode = lo->plh_inode; 1023 struct nfs_server *mds_server = NFS_SERVER(inode); 1024 1025 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1026 struct nfs_client *mds_client = mds_server->nfs_client; 1027 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1028 1029 if (task->tk_status >= 0) 1030 return 0; 1031 1032 switch (task->tk_status) { 1033 /* MDS state errors */ 1034 case -NFS4ERR_DELEG_REVOKED: 1035 case -NFS4ERR_ADMIN_REVOKED: 1036 case -NFS4ERR_BAD_STATEID: 1037 if (state == NULL) 1038 break; 1039 nfs_remove_bad_delegation(state->inode); 1040 case -NFS4ERR_OPENMODE: 1041 if (state == NULL) 1042 break; 1043 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0) 1044 goto out_bad_stateid; 1045 goto wait_on_recovery; 1046 case -NFS4ERR_EXPIRED: 1047 if (state != NULL) { 1048 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0) 1049 goto out_bad_stateid; 1050 } 1051 nfs4_schedule_lease_recovery(mds_client); 1052 goto wait_on_recovery; 1053 /* DS session errors */ 1054 case -NFS4ERR_BADSESSION: 1055 case -NFS4ERR_BADSLOT: 1056 case -NFS4ERR_BAD_HIGH_SLOT: 1057 case -NFS4ERR_DEADSESSION: 1058 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1059 case -NFS4ERR_SEQ_FALSE_RETRY: 1060 case -NFS4ERR_SEQ_MISORDERED: 1061 dprintk("%s ERROR %d, Reset session. Exchangeid " 1062 "flags 0x%x\n", __func__, task->tk_status, 1063 clp->cl_exchange_flags); 1064 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1065 break; 1066 case -NFS4ERR_DELAY: 1067 case -NFS4ERR_GRACE: 1068 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1069 break; 1070 case -NFS4ERR_RETRY_UNCACHED_REP: 1071 break; 1072 /* Invalidate Layout errors */ 1073 case -NFS4ERR_PNFS_NO_LAYOUT: 1074 case -ESTALE: /* mapped NFS4ERR_STALE */ 1075 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 1076 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 1077 case -NFS4ERR_FHEXPIRED: 1078 case -NFS4ERR_WRONG_TYPE: 1079 dprintk("%s Invalid layout error %d\n", __func__, 1080 task->tk_status); 1081 /* 1082 * Destroy layout so new i/o will get a new layout. 1083 * Layout will not be destroyed until all current lseg 1084 * references are put. Mark layout as invalid to resend failed 1085 * i/o and all i/o waiting on the slot table to the MDS until 1086 * layout is destroyed and a new valid layout is obtained. 1087 */ 1088 pnfs_destroy_layout(NFS_I(inode)); 1089 rpc_wake_up(&tbl->slot_tbl_waitq); 1090 goto reset; 1091 /* RPC connection errors */ 1092 case -ECONNREFUSED: 1093 case -EHOSTDOWN: 1094 case -EHOSTUNREACH: 1095 case -ENETUNREACH: 1096 case -EIO: 1097 case -ETIMEDOUT: 1098 case -EPIPE: 1099 dprintk("%s DS connection error %d\n", __func__, 1100 task->tk_status); 1101 nfs4_mark_deviceid_unavailable(devid); 1102 rpc_wake_up(&tbl->slot_tbl_waitq); 1103 /* fall through */ 1104 default: 1105 if (ff_layout_no_fallback_to_mds(lseg) || 1106 ff_layout_has_available_ds(lseg)) 1107 return -NFS4ERR_RESET_TO_PNFS; 1108 reset: 1109 dprintk("%s Retry through MDS. Error %d\n", __func__, 1110 task->tk_status); 1111 return -NFS4ERR_RESET_TO_MDS; 1112 } 1113 out: 1114 task->tk_status = 0; 1115 return -EAGAIN; 1116 out_bad_stateid: 1117 task->tk_status = -EIO; 1118 return 0; 1119 wait_on_recovery: 1120 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL); 1121 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0) 1122 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task); 1123 goto out; 1124 } 1125 1126 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1127 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1128 struct pnfs_layout_segment *lseg, 1129 int idx) 1130 { 1131 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1132 1133 if (task->tk_status >= 0) 1134 return 0; 1135 1136 switch (task->tk_status) { 1137 /* File access problems. Don't mark the device as unavailable */ 1138 case -EACCES: 1139 case -ESTALE: 1140 case -EISDIR: 1141 case -EBADHANDLE: 1142 case -ELOOP: 1143 case -ENOSPC: 1144 break; 1145 case -EJUKEBOX: 1146 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1147 goto out_retry; 1148 default: 1149 dprintk("%s DS connection error %d\n", __func__, 1150 task->tk_status); 1151 nfs4_mark_deviceid_unavailable(devid); 1152 } 1153 /* FIXME: Need to prevent infinite looping here. */ 1154 return -NFS4ERR_RESET_TO_PNFS; 1155 out_retry: 1156 task->tk_status = 0; 1157 rpc_restart_call_prepare(task); 1158 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1159 return -EAGAIN; 1160 } 1161 1162 static int ff_layout_async_handle_error(struct rpc_task *task, 1163 struct nfs4_state *state, 1164 struct nfs_client *clp, 1165 struct pnfs_layout_segment *lseg, 1166 int idx) 1167 { 1168 int vers = clp->cl_nfs_mod->rpc_vers->number; 1169 1170 switch (vers) { 1171 case 3: 1172 return ff_layout_async_handle_error_v3(task, lseg, idx); 1173 case 4: 1174 return ff_layout_async_handle_error_v4(task, state, clp, 1175 lseg, idx); 1176 default: 1177 /* should never happen */ 1178 WARN_ON_ONCE(1); 1179 return 0; 1180 } 1181 } 1182 1183 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1184 int idx, u64 offset, u64 length, 1185 u32 status, int opnum, int error) 1186 { 1187 struct nfs4_ff_layout_mirror *mirror; 1188 int err; 1189 1190 if (status == 0) { 1191 switch (error) { 1192 case -ETIMEDOUT: 1193 case -EPFNOSUPPORT: 1194 case -EPROTONOSUPPORT: 1195 case -EOPNOTSUPP: 1196 case -ECONNREFUSED: 1197 case -ECONNRESET: 1198 case -EHOSTDOWN: 1199 case -EHOSTUNREACH: 1200 case -ENETUNREACH: 1201 case -EADDRINUSE: 1202 case -ENOBUFS: 1203 case -EPIPE: 1204 case -EPERM: 1205 status = NFS4ERR_NXIO; 1206 break; 1207 case -EACCES: 1208 status = NFS4ERR_ACCESS; 1209 break; 1210 default: 1211 return; 1212 } 1213 } 1214 1215 switch (status) { 1216 case NFS4ERR_DELAY: 1217 case NFS4ERR_GRACE: 1218 return; 1219 default: 1220 break; 1221 } 1222 1223 mirror = FF_LAYOUT_COMP(lseg, idx); 1224 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1225 mirror, offset, length, status, opnum, 1226 GFP_NOIO); 1227 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg); 1228 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1229 } 1230 1231 /* NFS_PROTO call done callback routines */ 1232 static int ff_layout_read_done_cb(struct rpc_task *task, 1233 struct nfs_pgio_header *hdr) 1234 { 1235 int err; 1236 1237 trace_nfs4_pnfs_read(hdr, task->tk_status); 1238 if (task->tk_status < 0) 1239 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1240 hdr->args.offset, hdr->args.count, 1241 hdr->res.op_status, OP_READ, 1242 task->tk_status); 1243 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1244 hdr->ds_clp, hdr->lseg, 1245 hdr->pgio_mirror_idx); 1246 1247 switch (err) { 1248 case -NFS4ERR_RESET_TO_PNFS: 1249 if (ff_layout_choose_best_ds_for_read(hdr->lseg, 1250 hdr->pgio_mirror_idx + 1, 1251 &hdr->pgio_mirror_idx)) 1252 goto out_eagain; 1253 set_bit(NFS_LAYOUT_RETURN_REQUESTED, 1254 &hdr->lseg->pls_layout->plh_flags); 1255 pnfs_read_resend_pnfs(hdr); 1256 return task->tk_status; 1257 case -NFS4ERR_RESET_TO_MDS: 1258 ff_layout_reset_read(hdr); 1259 return task->tk_status; 1260 case -EAGAIN: 1261 goto out_eagain; 1262 } 1263 1264 return 0; 1265 out_eagain: 1266 rpc_restart_call_prepare(task); 1267 return -EAGAIN; 1268 } 1269 1270 static bool 1271 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1272 { 1273 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1274 } 1275 1276 /* 1277 * We reference the rpc_cred of the first WRITE that triggers the need for 1278 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1279 * rfc5661 is not clear about which credential should be used. 1280 * 1281 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1282 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1283 * we always send layoutcommit after DS writes. 1284 */ 1285 static void 1286 ff_layout_set_layoutcommit(struct nfs_pgio_header *hdr) 1287 { 1288 if (!ff_layout_need_layoutcommit(hdr->lseg)) 1289 return; 1290 1291 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, 1292 hdr->mds_offset + hdr->res.count); 1293 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino, 1294 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb); 1295 } 1296 1297 static bool 1298 ff_layout_reset_to_mds(struct pnfs_layout_segment *lseg, int idx) 1299 { 1300 /* No mirroring for now */ 1301 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx); 1302 1303 return ff_layout_test_devid_unavailable(node); 1304 } 1305 1306 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1307 struct nfs_pgio_header *hdr) 1308 { 1309 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1310 return; 1311 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1312 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1313 hdr->args.count, 1314 task->tk_start); 1315 } 1316 1317 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1318 struct nfs_pgio_header *hdr) 1319 { 1320 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1321 return; 1322 nfs4_ff_layout_stat_io_end_read(task, 1323 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1324 hdr->args.count, 1325 hdr->res.count); 1326 } 1327 1328 static int ff_layout_read_prepare_common(struct rpc_task *task, 1329 struct nfs_pgio_header *hdr) 1330 { 1331 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1332 rpc_exit(task, -EIO); 1333 return -EIO; 1334 } 1335 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) { 1336 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); 1337 if (ff_layout_has_available_ds(hdr->lseg)) 1338 pnfs_read_resend_pnfs(hdr); 1339 else 1340 ff_layout_reset_read(hdr); 1341 rpc_exit(task, 0); 1342 return -EAGAIN; 1343 } 1344 hdr->pgio_done_cb = ff_layout_read_done_cb; 1345 1346 ff_layout_read_record_layoutstats_start(task, hdr); 1347 return 0; 1348 } 1349 1350 /* 1351 * Call ops for the async read/write cases 1352 * In the case of dense layouts, the offset needs to be reset to its 1353 * original value. 1354 */ 1355 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1356 { 1357 struct nfs_pgio_header *hdr = data; 1358 1359 if (ff_layout_read_prepare_common(task, hdr)) 1360 return; 1361 1362 rpc_call_start(task); 1363 } 1364 1365 static int ff_layout_setup_sequence(struct nfs_client *ds_clp, 1366 struct nfs4_sequence_args *args, 1367 struct nfs4_sequence_res *res, 1368 struct rpc_task *task) 1369 { 1370 if (ds_clp->cl_session) 1371 return nfs41_setup_sequence(ds_clp->cl_session, 1372 args, 1373 res, 1374 task); 1375 return nfs40_setup_sequence(ds_clp->cl_slot_tbl, 1376 args, 1377 res, 1378 task); 1379 } 1380 1381 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1382 { 1383 struct nfs_pgio_header *hdr = data; 1384 1385 if (ff_layout_setup_sequence(hdr->ds_clp, 1386 &hdr->args.seq_args, 1387 &hdr->res.seq_res, 1388 task)) 1389 return; 1390 1391 if (ff_layout_read_prepare_common(task, hdr)) 1392 return; 1393 1394 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 1395 hdr->args.lock_context, FMODE_READ) == -EIO) 1396 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 1397 } 1398 1399 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1400 { 1401 struct nfs_pgio_header *hdr = data; 1402 1403 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 1404 1405 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1406 task->tk_status == 0) { 1407 nfs4_sequence_done(task, &hdr->res.seq_res); 1408 return; 1409 } 1410 1411 /* Note this may cause RPC to be resent */ 1412 hdr->mds_ops->rpc_call_done(task, hdr); 1413 } 1414 1415 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1416 { 1417 struct nfs_pgio_header *hdr = data; 1418 1419 ff_layout_read_record_layoutstats_done(task, hdr); 1420 rpc_count_iostats_metrics(task, 1421 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1422 } 1423 1424 static void ff_layout_read_release(void *data) 1425 { 1426 struct nfs_pgio_header *hdr = data; 1427 1428 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1429 pnfs_generic_rw_release(data); 1430 } 1431 1432 1433 static int ff_layout_write_done_cb(struct rpc_task *task, 1434 struct nfs_pgio_header *hdr) 1435 { 1436 int err; 1437 1438 trace_nfs4_pnfs_write(hdr, task->tk_status); 1439 if (task->tk_status < 0) 1440 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1441 hdr->args.offset, hdr->args.count, 1442 hdr->res.op_status, OP_WRITE, 1443 task->tk_status); 1444 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1445 hdr->ds_clp, hdr->lseg, 1446 hdr->pgio_mirror_idx); 1447 1448 switch (err) { 1449 case -NFS4ERR_RESET_TO_PNFS: 1450 ff_layout_reset_write(hdr, true); 1451 return task->tk_status; 1452 case -NFS4ERR_RESET_TO_MDS: 1453 ff_layout_reset_write(hdr, false); 1454 return task->tk_status; 1455 case -EAGAIN: 1456 return -EAGAIN; 1457 } 1458 1459 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1460 hdr->res.verf->committed == NFS_DATA_SYNC) 1461 ff_layout_set_layoutcommit(hdr); 1462 1463 /* zero out fattr since we don't care DS attr at all */ 1464 hdr->fattr.valid = 0; 1465 if (task->tk_status >= 0) 1466 nfs_writeback_update_inode(hdr); 1467 1468 return 0; 1469 } 1470 1471 static int ff_layout_commit_done_cb(struct rpc_task *task, 1472 struct nfs_commit_data *data) 1473 { 1474 int err; 1475 1476 trace_nfs4_pnfs_commit_ds(data, task->tk_status); 1477 if (task->tk_status < 0) 1478 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index, 1479 data->args.offset, data->args.count, 1480 data->res.op_status, OP_COMMIT, 1481 task->tk_status); 1482 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1483 data->lseg, data->ds_commit_index); 1484 1485 switch (err) { 1486 case -NFS4ERR_RESET_TO_PNFS: 1487 pnfs_generic_prepare_to_resend_writes(data); 1488 return -EAGAIN; 1489 case -NFS4ERR_RESET_TO_MDS: 1490 pnfs_generic_prepare_to_resend_writes(data); 1491 return -EAGAIN; 1492 case -EAGAIN: 1493 rpc_restart_call_prepare(task); 1494 return -EAGAIN; 1495 } 1496 1497 if (data->verf.committed == NFS_UNSTABLE 1498 && ff_layout_need_layoutcommit(data->lseg)) 1499 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb); 1500 1501 return 0; 1502 } 1503 1504 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1505 struct nfs_pgio_header *hdr) 1506 { 1507 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1508 return; 1509 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1510 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1511 hdr->args.count, 1512 task->tk_start); 1513 } 1514 1515 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1516 struct nfs_pgio_header *hdr) 1517 { 1518 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1519 return; 1520 nfs4_ff_layout_stat_io_end_write(task, 1521 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1522 hdr->args.count, hdr->res.count, 1523 hdr->res.verf->committed); 1524 } 1525 1526 static int ff_layout_write_prepare_common(struct rpc_task *task, 1527 struct nfs_pgio_header *hdr) 1528 { 1529 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1530 rpc_exit(task, -EIO); 1531 return -EIO; 1532 } 1533 1534 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) { 1535 bool retry_pnfs; 1536 1537 retry_pnfs = ff_layout_has_available_ds(hdr->lseg); 1538 dprintk("%s task %u reset io to %s\n", __func__, 1539 task->tk_pid, retry_pnfs ? "pNFS" : "MDS"); 1540 ff_layout_reset_write(hdr, retry_pnfs); 1541 rpc_exit(task, 0); 1542 return -EAGAIN; 1543 } 1544 1545 ff_layout_write_record_layoutstats_start(task, hdr); 1546 return 0; 1547 } 1548 1549 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1550 { 1551 struct nfs_pgio_header *hdr = data; 1552 1553 if (ff_layout_write_prepare_common(task, hdr)) 1554 return; 1555 1556 rpc_call_start(task); 1557 } 1558 1559 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1560 { 1561 struct nfs_pgio_header *hdr = data; 1562 1563 if (ff_layout_setup_sequence(hdr->ds_clp, 1564 &hdr->args.seq_args, 1565 &hdr->res.seq_res, 1566 task)) 1567 return; 1568 1569 if (ff_layout_write_prepare_common(task, hdr)) 1570 return; 1571 1572 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 1573 hdr->args.lock_context, FMODE_WRITE) == -EIO) 1574 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 1575 } 1576 1577 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1578 { 1579 struct nfs_pgio_header *hdr = data; 1580 1581 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1582 task->tk_status == 0) { 1583 nfs4_sequence_done(task, &hdr->res.seq_res); 1584 return; 1585 } 1586 1587 /* Note this may cause RPC to be resent */ 1588 hdr->mds_ops->rpc_call_done(task, hdr); 1589 } 1590 1591 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1592 { 1593 struct nfs_pgio_header *hdr = data; 1594 1595 ff_layout_write_record_layoutstats_done(task, hdr); 1596 rpc_count_iostats_metrics(task, 1597 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1598 } 1599 1600 static void ff_layout_write_release(void *data) 1601 { 1602 struct nfs_pgio_header *hdr = data; 1603 1604 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1605 pnfs_generic_rw_release(data); 1606 } 1607 1608 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1609 struct nfs_commit_data *cdata) 1610 { 1611 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1612 return; 1613 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1614 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1615 0, task->tk_start); 1616 } 1617 1618 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1619 struct nfs_commit_data *cdata) 1620 { 1621 struct nfs_page *req; 1622 __u64 count = 0; 1623 1624 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1625 return; 1626 1627 if (task->tk_status == 0) { 1628 list_for_each_entry(req, &cdata->pages, wb_list) 1629 count += req->wb_bytes; 1630 } 1631 nfs4_ff_layout_stat_io_end_write(task, 1632 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1633 count, count, NFS_FILE_SYNC); 1634 } 1635 1636 static void ff_layout_commit_prepare_common(struct rpc_task *task, 1637 struct nfs_commit_data *cdata) 1638 { 1639 ff_layout_commit_record_layoutstats_start(task, cdata); 1640 } 1641 1642 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1643 { 1644 ff_layout_commit_prepare_common(task, data); 1645 rpc_call_start(task); 1646 } 1647 1648 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1649 { 1650 struct nfs_commit_data *wdata = data; 1651 1652 if (ff_layout_setup_sequence(wdata->ds_clp, 1653 &wdata->args.seq_args, 1654 &wdata->res.seq_res, 1655 task)) 1656 return; 1657 ff_layout_commit_prepare_common(task, data); 1658 } 1659 1660 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1661 { 1662 pnfs_generic_write_commit_done(task, data); 1663 } 1664 1665 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1666 { 1667 struct nfs_commit_data *cdata = data; 1668 1669 ff_layout_commit_record_layoutstats_done(task, cdata); 1670 rpc_count_iostats_metrics(task, 1671 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1672 } 1673 1674 static void ff_layout_commit_release(void *data) 1675 { 1676 struct nfs_commit_data *cdata = data; 1677 1678 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1679 pnfs_generic_commit_release(data); 1680 } 1681 1682 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1683 .rpc_call_prepare = ff_layout_read_prepare_v3, 1684 .rpc_call_done = ff_layout_read_call_done, 1685 .rpc_count_stats = ff_layout_read_count_stats, 1686 .rpc_release = ff_layout_read_release, 1687 }; 1688 1689 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 1690 .rpc_call_prepare = ff_layout_read_prepare_v4, 1691 .rpc_call_done = ff_layout_read_call_done, 1692 .rpc_count_stats = ff_layout_read_count_stats, 1693 .rpc_release = ff_layout_read_release, 1694 }; 1695 1696 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1697 .rpc_call_prepare = ff_layout_write_prepare_v3, 1698 .rpc_call_done = ff_layout_write_call_done, 1699 .rpc_count_stats = ff_layout_write_count_stats, 1700 .rpc_release = ff_layout_write_release, 1701 }; 1702 1703 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1704 .rpc_call_prepare = ff_layout_write_prepare_v4, 1705 .rpc_call_done = ff_layout_write_call_done, 1706 .rpc_count_stats = ff_layout_write_count_stats, 1707 .rpc_release = ff_layout_write_release, 1708 }; 1709 1710 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 1711 .rpc_call_prepare = ff_layout_commit_prepare_v3, 1712 .rpc_call_done = ff_layout_commit_done, 1713 .rpc_count_stats = ff_layout_commit_count_stats, 1714 .rpc_release = ff_layout_commit_release, 1715 }; 1716 1717 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 1718 .rpc_call_prepare = ff_layout_commit_prepare_v4, 1719 .rpc_call_done = ff_layout_commit_done, 1720 .rpc_count_stats = ff_layout_commit_count_stats, 1721 .rpc_release = ff_layout_commit_release, 1722 }; 1723 1724 static enum pnfs_try_status 1725 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 1726 { 1727 struct pnfs_layout_segment *lseg = hdr->lseg; 1728 struct nfs4_pnfs_ds *ds; 1729 struct rpc_clnt *ds_clnt; 1730 struct rpc_cred *ds_cred; 1731 loff_t offset = hdr->args.offset; 1732 u32 idx = hdr->pgio_mirror_idx; 1733 int vers; 1734 struct nfs_fh *fh; 1735 1736 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n", 1737 __func__, hdr->inode->i_ino, 1738 hdr->args.pgbase, (size_t)hdr->args.count, offset); 1739 1740 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false); 1741 if (!ds) 1742 goto out_failed; 1743 1744 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp, 1745 hdr->inode); 1746 if (IS_ERR(ds_clnt)) 1747 goto out_failed; 1748 1749 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred); 1750 if (!ds_cred) 1751 goto out_failed; 1752 1753 vers = nfs4_ff_layout_ds_version(lseg, idx); 1754 1755 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 1756 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers); 1757 1758 atomic_inc(&ds->ds_clp->cl_count); 1759 hdr->ds_clp = ds->ds_clp; 1760 fh = nfs4_ff_layout_select_ds_fh(lseg, idx); 1761 if (fh) 1762 hdr->args.fh = fh; 1763 /* 1764 * Note that if we ever decide to split across DSes, 1765 * then we may need to handle dense-like offsets. 1766 */ 1767 hdr->args.offset = offset; 1768 hdr->mds_offset = offset; 1769 1770 /* Perform an asynchronous read to ds */ 1771 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1772 vers == 3 ? &ff_layout_read_call_ops_v3 : 1773 &ff_layout_read_call_ops_v4, 1774 0, RPC_TASK_SOFTCONN); 1775 put_rpccred(ds_cred); 1776 return PNFS_ATTEMPTED; 1777 1778 out_failed: 1779 if (ff_layout_has_available_ds(lseg)) 1780 return PNFS_TRY_AGAIN; 1781 return PNFS_NOT_ATTEMPTED; 1782 } 1783 1784 /* Perform async writes. */ 1785 static enum pnfs_try_status 1786 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 1787 { 1788 struct pnfs_layout_segment *lseg = hdr->lseg; 1789 struct nfs4_pnfs_ds *ds; 1790 struct rpc_clnt *ds_clnt; 1791 struct rpc_cred *ds_cred; 1792 loff_t offset = hdr->args.offset; 1793 int vers; 1794 struct nfs_fh *fh; 1795 int idx = hdr->pgio_mirror_idx; 1796 1797 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true); 1798 if (!ds) 1799 return PNFS_NOT_ATTEMPTED; 1800 1801 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp, 1802 hdr->inode); 1803 if (IS_ERR(ds_clnt)) 1804 return PNFS_NOT_ATTEMPTED; 1805 1806 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred); 1807 if (!ds_cred) 1808 return PNFS_NOT_ATTEMPTED; 1809 1810 vers = nfs4_ff_layout_ds_version(lseg, idx); 1811 1812 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n", 1813 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 1814 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), 1815 vers); 1816 1817 hdr->pgio_done_cb = ff_layout_write_done_cb; 1818 atomic_inc(&ds->ds_clp->cl_count); 1819 hdr->ds_clp = ds->ds_clp; 1820 hdr->ds_commit_idx = idx; 1821 fh = nfs4_ff_layout_select_ds_fh(lseg, idx); 1822 if (fh) 1823 hdr->args.fh = fh; 1824 1825 /* 1826 * Note that if we ever decide to split across DSes, 1827 * then we may need to handle dense-like offsets. 1828 */ 1829 hdr->args.offset = offset; 1830 1831 /* Perform an asynchronous write */ 1832 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1833 vers == 3 ? &ff_layout_write_call_ops_v3 : 1834 &ff_layout_write_call_ops_v4, 1835 sync, RPC_TASK_SOFTCONN); 1836 put_rpccred(ds_cred); 1837 return PNFS_ATTEMPTED; 1838 } 1839 1840 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1841 { 1842 return i; 1843 } 1844 1845 static struct nfs_fh * 1846 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1847 { 1848 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1849 1850 /* FIXME: Assume that there is only one NFS version available 1851 * for the DS. 1852 */ 1853 return &flseg->mirror_array[i]->fh_versions[0]; 1854 } 1855 1856 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 1857 { 1858 struct pnfs_layout_segment *lseg = data->lseg; 1859 struct nfs4_pnfs_ds *ds; 1860 struct rpc_clnt *ds_clnt; 1861 struct rpc_cred *ds_cred; 1862 u32 idx; 1863 int vers, ret; 1864 struct nfs_fh *fh; 1865 1866 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1867 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true); 1868 if (!ds) 1869 goto out_err; 1870 1871 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp, 1872 data->inode); 1873 if (IS_ERR(ds_clnt)) 1874 goto out_err; 1875 1876 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred); 1877 if (!ds_cred) 1878 goto out_err; 1879 1880 vers = nfs4_ff_layout_ds_version(lseg, idx); 1881 1882 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 1883 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count), 1884 vers); 1885 data->commit_done_cb = ff_layout_commit_done_cb; 1886 data->cred = ds_cred; 1887 atomic_inc(&ds->ds_clp->cl_count); 1888 data->ds_clp = ds->ds_clp; 1889 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1890 if (fh) 1891 data->args.fh = fh; 1892 1893 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 1894 vers == 3 ? &ff_layout_commit_call_ops_v3 : 1895 &ff_layout_commit_call_ops_v4, 1896 how, RPC_TASK_SOFTCONN); 1897 put_rpccred(ds_cred); 1898 return ret; 1899 out_err: 1900 pnfs_generic_prepare_to_resend_writes(data); 1901 pnfs_generic_commit_release(data); 1902 return -EAGAIN; 1903 } 1904 1905 static int 1906 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1907 int how, struct nfs_commit_info *cinfo) 1908 { 1909 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1910 ff_layout_initiate_commit); 1911 } 1912 1913 static struct pnfs_ds_commit_info * 1914 ff_layout_get_ds_info(struct inode *inode) 1915 { 1916 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1917 1918 if (layout == NULL) 1919 return NULL; 1920 1921 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 1922 } 1923 1924 static void 1925 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 1926 { 1927 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 1928 id_node)); 1929 } 1930 1931 static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo, 1932 struct xdr_stream *xdr, 1933 const struct nfs4_layoutreturn_args *args) 1934 { 1935 struct pnfs_layout_hdr *hdr = &flo->generic_hdr; 1936 __be32 *start; 1937 int count = 0, ret = 0; 1938 1939 start = xdr_reserve_space(xdr, 4); 1940 if (unlikely(!start)) 1941 return -E2BIG; 1942 1943 /* This assume we always return _ALL_ layouts */ 1944 spin_lock(&hdr->plh_inode->i_lock); 1945 ret = ff_layout_encode_ds_ioerr(flo, xdr, &count, &args->range); 1946 spin_unlock(&hdr->plh_inode->i_lock); 1947 1948 *start = cpu_to_be32(count); 1949 1950 return ret; 1951 } 1952 1953 /* report nothing for now */ 1954 static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo, 1955 struct xdr_stream *xdr, 1956 const struct nfs4_layoutreturn_args *args) 1957 { 1958 __be32 *p; 1959 1960 p = xdr_reserve_space(xdr, 4); 1961 if (likely(p)) 1962 *p = cpu_to_be32(0); 1963 } 1964 1965 static struct nfs4_deviceid_node * 1966 ff_layout_alloc_deviceid_node(struct nfs_server *server, 1967 struct pnfs_device *pdev, gfp_t gfp_flags) 1968 { 1969 struct nfs4_ff_layout_ds *dsaddr; 1970 1971 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 1972 if (!dsaddr) 1973 return NULL; 1974 return &dsaddr->id_node; 1975 } 1976 1977 static void 1978 ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo, 1979 struct xdr_stream *xdr, 1980 const struct nfs4_layoutreturn_args *args) 1981 { 1982 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo); 1983 __be32 *start; 1984 1985 dprintk("%s: Begin\n", __func__); 1986 start = xdr_reserve_space(xdr, 4); 1987 BUG_ON(!start); 1988 1989 ff_layout_encode_ioerr(flo, xdr, args); 1990 ff_layout_encode_iostats(flo, xdr, args); 1991 1992 *start = cpu_to_be32((xdr->p - start - 1) * 4); 1993 dprintk("%s: Return\n", __func__); 1994 } 1995 1996 static int 1997 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 1998 { 1999 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2000 2001 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2002 } 2003 2004 static size_t 2005 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2006 const int buflen) 2007 { 2008 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2009 const struct in6_addr *addr = &sin6->sin6_addr; 2010 2011 /* 2012 * RFC 4291, Section 2.2.2 2013 * 2014 * Shorthanded ANY address 2015 */ 2016 if (ipv6_addr_any(addr)) 2017 return snprintf(buf, buflen, "::"); 2018 2019 /* 2020 * RFC 4291, Section 2.2.2 2021 * 2022 * Shorthanded loopback address 2023 */ 2024 if (ipv6_addr_loopback(addr)) 2025 return snprintf(buf, buflen, "::1"); 2026 2027 /* 2028 * RFC 4291, Section 2.2.3 2029 * 2030 * Special presentation address format for mapped v4 2031 * addresses. 2032 */ 2033 if (ipv6_addr_v4mapped(addr)) 2034 return snprintf(buf, buflen, "::ffff:%pI4", 2035 &addr->s6_addr32[3]); 2036 2037 /* 2038 * RFC 4291, Section 2.2.1 2039 */ 2040 return snprintf(buf, buflen, "%pI6c", addr); 2041 } 2042 2043 /* Derived from rpc_sockaddr2uaddr */ 2044 static void 2045 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2046 { 2047 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2048 char portbuf[RPCBIND_MAXUADDRPLEN]; 2049 char addrbuf[RPCBIND_MAXUADDRLEN]; 2050 char *netid; 2051 unsigned short port; 2052 int len, netid_len; 2053 __be32 *p; 2054 2055 switch (sap->sa_family) { 2056 case AF_INET: 2057 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2058 return; 2059 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2060 netid = "tcp"; 2061 netid_len = 3; 2062 break; 2063 case AF_INET6: 2064 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2065 return; 2066 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2067 netid = "tcp6"; 2068 netid_len = 4; 2069 break; 2070 default: 2071 /* we only support tcp and tcp6 */ 2072 WARN_ON_ONCE(1); 2073 return; 2074 } 2075 2076 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2077 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2078 2079 p = xdr_reserve_space(xdr, 4 + netid_len); 2080 xdr_encode_opaque(p, netid, netid_len); 2081 2082 p = xdr_reserve_space(xdr, 4 + len); 2083 xdr_encode_opaque(p, addrbuf, len); 2084 } 2085 2086 static void 2087 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2088 ktime_t t) 2089 { 2090 struct timespec64 ts; 2091 __be32 *p; 2092 2093 p = xdr_reserve_space(xdr, 12); 2094 ts = ktime_to_timespec64(t); 2095 p = xdr_encode_hyper(p, ts.tv_sec); 2096 *p++ = cpu_to_be32(ts.tv_nsec); 2097 } 2098 2099 static void 2100 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2101 struct nfs4_ff_io_stat *stat) 2102 { 2103 __be32 *p; 2104 2105 p = xdr_reserve_space(xdr, 5 * 8); 2106 p = xdr_encode_hyper(p, stat->ops_requested); 2107 p = xdr_encode_hyper(p, stat->bytes_requested); 2108 p = xdr_encode_hyper(p, stat->ops_completed); 2109 p = xdr_encode_hyper(p, stat->bytes_completed); 2110 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2111 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2112 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2113 } 2114 2115 static void 2116 ff_layout_encode_layoutstats(struct xdr_stream *xdr, 2117 struct nfs42_layoutstat_args *args, 2118 struct nfs42_layoutstat_devinfo *devinfo) 2119 { 2120 struct nfs4_ff_layout_mirror *mirror = devinfo->layout_private; 2121 struct nfs4_pnfs_ds_addr *da; 2122 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds; 2123 struct nfs_fh *fh = &mirror->fh_versions[0]; 2124 __be32 *p, *start; 2125 2126 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2127 dprintk("%s: DS %s: encoding address %s\n", 2128 __func__, ds->ds_remotestr, da->da_remotestr); 2129 /* layoutupdate length */ 2130 start = xdr_reserve_space(xdr, 4); 2131 /* netaddr4 */ 2132 ff_layout_encode_netaddr(xdr, da); 2133 /* nfs_fh4 */ 2134 p = xdr_reserve_space(xdr, 4 + fh->size); 2135 xdr_encode_opaque(p, fh->data, fh->size); 2136 /* ff_io_latency4 read */ 2137 spin_lock(&mirror->lock); 2138 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat); 2139 /* ff_io_latency4 write */ 2140 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat); 2141 spin_unlock(&mirror->lock); 2142 /* nfstime4 */ 2143 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time)); 2144 /* bool */ 2145 p = xdr_reserve_space(xdr, 4); 2146 *p = cpu_to_be32(false); 2147 2148 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2149 } 2150 2151 static int 2152 ff_layout_mirror_prepare_stats(struct nfs42_layoutstat_args *args, 2153 struct pnfs_layout_hdr *lo, 2154 int dev_limit) 2155 { 2156 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2157 struct nfs4_ff_layout_mirror *mirror; 2158 struct nfs4_deviceid_node *dev; 2159 struct nfs42_layoutstat_devinfo *devinfo; 2160 int i = 0; 2161 2162 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2163 if (i >= dev_limit) 2164 break; 2165 if (!mirror->mirror_ds) 2166 continue; 2167 /* mirror refcount put in cleanup_layoutstats */ 2168 if (!atomic_inc_not_zero(&mirror->ref)) 2169 continue; 2170 dev = &mirror->mirror_ds->id_node; 2171 devinfo = &args->devinfo[i]; 2172 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE); 2173 devinfo->offset = 0; 2174 devinfo->length = NFS4_MAX_UINT64; 2175 devinfo->read_count = mirror->read_stat.io_stat.ops_completed; 2176 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed; 2177 devinfo->write_count = mirror->write_stat.io_stat.ops_completed; 2178 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed; 2179 devinfo->layout_type = LAYOUT_FLEX_FILES; 2180 devinfo->layoutstats_encode = ff_layout_encode_layoutstats; 2181 devinfo->layout_private = mirror; 2182 2183 i++; 2184 } 2185 return i; 2186 } 2187 2188 static int 2189 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2190 { 2191 struct nfs4_flexfile_layout *ff_layout; 2192 struct nfs4_ff_layout_mirror *mirror; 2193 int dev_count = 0; 2194 2195 spin_lock(&args->inode->i_lock); 2196 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout); 2197 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2198 if (atomic_read(&mirror->ref) != 0) 2199 dev_count ++; 2200 } 2201 spin_unlock(&args->inode->i_lock); 2202 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2203 if (dev_count > PNFS_LAYOUTSTATS_MAXDEV) { 2204 dprintk("%s: truncating devinfo to limit (%d:%d)\n", 2205 __func__, dev_count, PNFS_LAYOUTSTATS_MAXDEV); 2206 dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2207 } 2208 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO); 2209 if (!args->devinfo) 2210 return -ENOMEM; 2211 2212 spin_lock(&args->inode->i_lock); 2213 args->num_dev = ff_layout_mirror_prepare_stats(args, 2214 &ff_layout->generic_hdr, dev_count); 2215 spin_unlock(&args->inode->i_lock); 2216 2217 return 0; 2218 } 2219 2220 static void 2221 ff_layout_cleanup_layoutstats(struct nfs42_layoutstat_data *data) 2222 { 2223 struct nfs4_ff_layout_mirror *mirror; 2224 int i; 2225 2226 for (i = 0; i < data->args.num_dev; i++) { 2227 mirror = data->args.devinfo[i].layout_private; 2228 data->args.devinfo[i].layout_private = NULL; 2229 ff_layout_put_mirror(mirror); 2230 } 2231 } 2232 2233 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2234 .id = LAYOUT_FLEX_FILES, 2235 .name = "LAYOUT_FLEX_FILES", 2236 .owner = THIS_MODULE, 2237 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2238 .free_layout_hdr = ff_layout_free_layout_hdr, 2239 .alloc_lseg = ff_layout_alloc_lseg, 2240 .free_lseg = ff_layout_free_lseg, 2241 .add_lseg = ff_layout_add_lseg, 2242 .pg_read_ops = &ff_layout_pg_read_ops, 2243 .pg_write_ops = &ff_layout_pg_write_ops, 2244 .get_ds_info = ff_layout_get_ds_info, 2245 .free_deviceid_node = ff_layout_free_deviceid_node, 2246 .mark_request_commit = pnfs_layout_mark_request_commit, 2247 .clear_request_commit = pnfs_generic_clear_request_commit, 2248 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2249 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2250 .commit_pagelist = ff_layout_commit_pagelist, 2251 .read_pagelist = ff_layout_read_pagelist, 2252 .write_pagelist = ff_layout_write_pagelist, 2253 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 2254 .encode_layoutreturn = ff_layout_encode_layoutreturn, 2255 .sync = pnfs_nfs_generic_sync, 2256 .prepare_layoutstats = ff_layout_prepare_layoutstats, 2257 .cleanup_layoutstats = ff_layout_cleanup_layoutstats, 2258 }; 2259 2260 static int __init nfs4flexfilelayout_init(void) 2261 { 2262 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 2263 __func__); 2264 if (!ff_zero_group) { 2265 ff_zero_group = groups_alloc(0); 2266 if (!ff_zero_group) 2267 return -ENOMEM; 2268 } 2269 return pnfs_register_layoutdriver(&flexfilelayout_type); 2270 } 2271 2272 static void __exit nfs4flexfilelayout_exit(void) 2273 { 2274 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 2275 __func__); 2276 pnfs_unregister_layoutdriver(&flexfilelayout_type); 2277 if (ff_zero_group) { 2278 put_group_info(ff_zero_group); 2279 ff_zero_group = NULL; 2280 } 2281 } 2282 2283 MODULE_ALIAS("nfs-layouttype4-4"); 2284 2285 MODULE_LICENSE("GPL"); 2286 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 2287 2288 module_init(nfs4flexfilelayout_init); 2289 module_exit(nfs4flexfilelayout_exit); 2290