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 #define FF_LAYOUTRETURN_MAXERR 20 29 30 31 static struct group_info *ff_zero_group; 32 33 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 34 struct nfs_pgio_header *hdr); 35 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 36 struct nfs42_layoutstat_devinfo *devinfo, 37 int dev_limit); 38 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 39 const struct nfs42_layoutstat_devinfo *devinfo, 40 struct nfs4_ff_layout_mirror *mirror); 41 42 static struct pnfs_layout_hdr * 43 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 44 { 45 struct nfs4_flexfile_layout *ffl; 46 47 ffl = kzalloc(sizeof(*ffl), gfp_flags); 48 if (ffl) { 49 INIT_LIST_HEAD(&ffl->error_list); 50 INIT_LIST_HEAD(&ffl->mirrors); 51 ffl->last_report_time = ktime_get(); 52 return &ffl->generic_hdr; 53 } else 54 return NULL; 55 } 56 57 static void 58 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo) 59 { 60 struct nfs4_ff_layout_ds_err *err, *n; 61 62 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list, 63 list) { 64 list_del(&err->list); 65 kfree(err); 66 } 67 kfree(FF_LAYOUT_FROM_HDR(lo)); 68 } 69 70 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 71 { 72 __be32 *p; 73 74 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 75 if (unlikely(p == NULL)) 76 return -ENOBUFS; 77 stateid->type = NFS4_PNFS_DS_STATEID_TYPE; 78 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 79 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__, 80 p[0], p[1], p[2], p[3]); 81 return 0; 82 } 83 84 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid) 85 { 86 __be32 *p; 87 88 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE); 89 if (unlikely(!p)) 90 return -ENOBUFS; 91 memcpy(devid, p, NFS4_DEVICEID4_SIZE); 92 nfs4_print_deviceid(devid); 93 return 0; 94 } 95 96 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 97 { 98 __be32 *p; 99 100 p = xdr_inline_decode(xdr, 4); 101 if (unlikely(!p)) 102 return -ENOBUFS; 103 fh->size = be32_to_cpup(p++); 104 if (fh->size > sizeof(struct nfs_fh)) { 105 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n", 106 fh->size); 107 return -EOVERFLOW; 108 } 109 /* fh.data */ 110 p = xdr_inline_decode(xdr, fh->size); 111 if (unlikely(!p)) 112 return -ENOBUFS; 113 memcpy(&fh->data, p, fh->size); 114 dprintk("%s: fh len %d\n", __func__, fh->size); 115 116 return 0; 117 } 118 119 /* 120 * Currently only stringified uids and gids are accepted. 121 * I.e., kerberos is not supported to the DSes, so no pricipals. 122 * 123 * That means that one common function will suffice, but when 124 * principals are added, this should be split to accomodate 125 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid(). 126 */ 127 static int 128 decode_name(struct xdr_stream *xdr, u32 *id) 129 { 130 __be32 *p; 131 int len; 132 133 /* opaque_length(4)*/ 134 p = xdr_inline_decode(xdr, 4); 135 if (unlikely(!p)) 136 return -ENOBUFS; 137 len = be32_to_cpup(p++); 138 if (len < 0) 139 return -EINVAL; 140 141 dprintk("%s: len %u\n", __func__, len); 142 143 /* opaque body */ 144 p = xdr_inline_decode(xdr, len); 145 if (unlikely(!p)) 146 return -ENOBUFS; 147 148 if (!nfs_map_string_to_numeric((char *)p, len, id)) 149 return -EINVAL; 150 151 return 0; 152 } 153 154 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1, 155 const struct nfs4_ff_layout_mirror *m2) 156 { 157 int i, j; 158 159 if (m1->fh_versions_cnt != m2->fh_versions_cnt) 160 return false; 161 for (i = 0; i < m1->fh_versions_cnt; i++) { 162 bool found_fh = false; 163 for (j = 0; j < m2->fh_versions_cnt; j++) { 164 if (nfs_compare_fh(&m1->fh_versions[i], 165 &m2->fh_versions[j]) == 0) { 166 found_fh = true; 167 break; 168 } 169 } 170 if (!found_fh) 171 return false; 172 } 173 return true; 174 } 175 176 static struct nfs4_ff_layout_mirror * 177 ff_layout_add_mirror(struct pnfs_layout_hdr *lo, 178 struct nfs4_ff_layout_mirror *mirror) 179 { 180 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 181 struct nfs4_ff_layout_mirror *pos; 182 struct inode *inode = lo->plh_inode; 183 184 spin_lock(&inode->i_lock); 185 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) { 186 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0) 187 continue; 188 if (!ff_mirror_match_fh(mirror, pos)) 189 continue; 190 if (refcount_inc_not_zero(&pos->ref)) { 191 spin_unlock(&inode->i_lock); 192 return pos; 193 } 194 } 195 list_add(&mirror->mirrors, &ff_layout->mirrors); 196 mirror->layout = lo; 197 spin_unlock(&inode->i_lock); 198 return mirror; 199 } 200 201 static void 202 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror) 203 { 204 struct inode *inode; 205 if (mirror->layout == NULL) 206 return; 207 inode = mirror->layout->plh_inode; 208 spin_lock(&inode->i_lock); 209 list_del(&mirror->mirrors); 210 spin_unlock(&inode->i_lock); 211 mirror->layout = NULL; 212 } 213 214 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags) 215 { 216 struct nfs4_ff_layout_mirror *mirror; 217 218 mirror = kzalloc(sizeof(*mirror), gfp_flags); 219 if (mirror != NULL) { 220 spin_lock_init(&mirror->lock); 221 refcount_set(&mirror->ref, 1); 222 INIT_LIST_HEAD(&mirror->mirrors); 223 } 224 return mirror; 225 } 226 227 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror) 228 { 229 struct rpc_cred *cred; 230 231 ff_layout_remove_mirror(mirror); 232 kfree(mirror->fh_versions); 233 cred = rcu_access_pointer(mirror->ro_cred); 234 if (cred) 235 put_rpccred(cred); 236 cred = rcu_access_pointer(mirror->rw_cred); 237 if (cred) 238 put_rpccred(cred); 239 nfs4_ff_layout_put_deviceid(mirror->mirror_ds); 240 kfree(mirror); 241 } 242 243 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror) 244 { 245 if (mirror != NULL && refcount_dec_and_test(&mirror->ref)) 246 ff_layout_free_mirror(mirror); 247 } 248 249 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls) 250 { 251 int i; 252 253 if (fls->mirror_array) { 254 for (i = 0; i < fls->mirror_array_cnt; i++) { 255 /* normally mirror_ds is freed in 256 * .free_deviceid_node but we still do it here 257 * for .alloc_lseg error path */ 258 ff_layout_put_mirror(fls->mirror_array[i]); 259 } 260 kfree(fls->mirror_array); 261 fls->mirror_array = NULL; 262 } 263 } 264 265 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr) 266 { 267 int ret = 0; 268 269 dprintk("--> %s\n", __func__); 270 271 /* FIXME: remove this check when layout segment support is added */ 272 if (lgr->range.offset != 0 || 273 lgr->range.length != NFS4_MAX_UINT64) { 274 dprintk("%s Only whole file layouts supported. Use MDS i/o\n", 275 __func__); 276 ret = -EINVAL; 277 } 278 279 dprintk("--> %s returns %d\n", __func__, ret); 280 return ret; 281 } 282 283 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls) 284 { 285 if (fls) { 286 ff_layout_free_mirror_array(fls); 287 kfree(fls); 288 } 289 } 290 291 static bool 292 ff_lseg_range_is_after(const struct pnfs_layout_range *l1, 293 const struct pnfs_layout_range *l2) 294 { 295 u64 end1, end2; 296 297 if (l1->iomode != l2->iomode) 298 return l1->iomode != IOMODE_READ; 299 end1 = pnfs_calc_offset_end(l1->offset, l1->length); 300 end2 = pnfs_calc_offset_end(l2->offset, l2->length); 301 if (end1 < l2->offset) 302 return false; 303 if (end2 < l1->offset) 304 return true; 305 return l2->offset <= l1->offset; 306 } 307 308 static bool 309 ff_lseg_merge(struct pnfs_layout_segment *new, 310 struct pnfs_layout_segment *old) 311 { 312 u64 new_end, old_end; 313 314 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags)) 315 return false; 316 if (new->pls_range.iomode != old->pls_range.iomode) 317 return false; 318 old_end = pnfs_calc_offset_end(old->pls_range.offset, 319 old->pls_range.length); 320 if (old_end < new->pls_range.offset) 321 return false; 322 new_end = pnfs_calc_offset_end(new->pls_range.offset, 323 new->pls_range.length); 324 if (new_end < old->pls_range.offset) 325 return false; 326 327 /* Mergeable: copy info from 'old' to 'new' */ 328 if (new_end < old_end) 329 new_end = old_end; 330 if (new->pls_range.offset < old->pls_range.offset) 331 new->pls_range.offset = old->pls_range.offset; 332 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset, 333 new_end); 334 if (test_bit(NFS_LSEG_ROC, &old->pls_flags)) 335 set_bit(NFS_LSEG_ROC, &new->pls_flags); 336 return true; 337 } 338 339 static void 340 ff_layout_add_lseg(struct pnfs_layout_hdr *lo, 341 struct pnfs_layout_segment *lseg, 342 struct list_head *free_me) 343 { 344 pnfs_generic_layout_insert_lseg(lo, lseg, 345 ff_lseg_range_is_after, 346 ff_lseg_merge, 347 free_me); 348 } 349 350 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls) 351 { 352 int i, j; 353 354 for (i = 0; i < fls->mirror_array_cnt - 1; i++) { 355 for (j = i + 1; j < fls->mirror_array_cnt; j++) 356 if (fls->mirror_array[i]->efficiency < 357 fls->mirror_array[j]->efficiency) 358 swap(fls->mirror_array[i], 359 fls->mirror_array[j]); 360 } 361 } 362 363 static struct pnfs_layout_segment * 364 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh, 365 struct nfs4_layoutget_res *lgr, 366 gfp_t gfp_flags) 367 { 368 struct pnfs_layout_segment *ret; 369 struct nfs4_ff_layout_segment *fls = NULL; 370 struct xdr_stream stream; 371 struct xdr_buf buf; 372 struct page *scratch; 373 u64 stripe_unit; 374 u32 mirror_array_cnt; 375 __be32 *p; 376 int i, rc; 377 378 dprintk("--> %s\n", __func__); 379 scratch = alloc_page(gfp_flags); 380 if (!scratch) 381 return ERR_PTR(-ENOMEM); 382 383 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, 384 lgr->layoutp->len); 385 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 386 387 /* stripe unit and mirror_array_cnt */ 388 rc = -EIO; 389 p = xdr_inline_decode(&stream, 8 + 4); 390 if (!p) 391 goto out_err_free; 392 393 p = xdr_decode_hyper(p, &stripe_unit); 394 mirror_array_cnt = be32_to_cpup(p++); 395 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__, 396 stripe_unit, mirror_array_cnt); 397 398 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT || 399 mirror_array_cnt == 0) 400 goto out_err_free; 401 402 rc = -ENOMEM; 403 fls = kzalloc(sizeof(*fls), gfp_flags); 404 if (!fls) 405 goto out_err_free; 406 407 fls->mirror_array_cnt = mirror_array_cnt; 408 fls->stripe_unit = stripe_unit; 409 fls->mirror_array = kcalloc(fls->mirror_array_cnt, 410 sizeof(fls->mirror_array[0]), gfp_flags); 411 if (fls->mirror_array == NULL) 412 goto out_err_free; 413 414 for (i = 0; i < fls->mirror_array_cnt; i++) { 415 struct nfs4_ff_layout_mirror *mirror; 416 struct auth_cred acred = { .group_info = ff_zero_group }; 417 struct rpc_cred __rcu *cred; 418 u32 ds_count, fh_count, id; 419 int j; 420 421 rc = -EIO; 422 p = xdr_inline_decode(&stream, 4); 423 if (!p) 424 goto out_err_free; 425 ds_count = be32_to_cpup(p); 426 427 /* FIXME: allow for striping? */ 428 if (ds_count != 1) 429 goto out_err_free; 430 431 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags); 432 if (fls->mirror_array[i] == NULL) { 433 rc = -ENOMEM; 434 goto out_err_free; 435 } 436 437 fls->mirror_array[i]->ds_count = ds_count; 438 439 /* deviceid */ 440 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid); 441 if (rc) 442 goto out_err_free; 443 444 /* efficiency */ 445 rc = -EIO; 446 p = xdr_inline_decode(&stream, 4); 447 if (!p) 448 goto out_err_free; 449 fls->mirror_array[i]->efficiency = be32_to_cpup(p); 450 451 /* stateid */ 452 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid); 453 if (rc) 454 goto out_err_free; 455 456 /* fh */ 457 rc = -EIO; 458 p = xdr_inline_decode(&stream, 4); 459 if (!p) 460 goto out_err_free; 461 fh_count = be32_to_cpup(p); 462 463 fls->mirror_array[i]->fh_versions = 464 kzalloc(fh_count * sizeof(struct nfs_fh), 465 gfp_flags); 466 if (fls->mirror_array[i]->fh_versions == NULL) { 467 rc = -ENOMEM; 468 goto out_err_free; 469 } 470 471 for (j = 0; j < fh_count; j++) { 472 rc = decode_nfs_fh(&stream, 473 &fls->mirror_array[i]->fh_versions[j]); 474 if (rc) 475 goto out_err_free; 476 } 477 478 fls->mirror_array[i]->fh_versions_cnt = fh_count; 479 480 /* user */ 481 rc = decode_name(&stream, &id); 482 if (rc) 483 goto out_err_free; 484 485 acred.uid = make_kuid(&init_user_ns, id); 486 487 /* group */ 488 rc = decode_name(&stream, &id); 489 if (rc) 490 goto out_err_free; 491 492 acred.gid = make_kgid(&init_user_ns, id); 493 494 /* find the cred for it */ 495 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags)); 496 if (IS_ERR(cred)) { 497 rc = PTR_ERR(cred); 498 goto out_err_free; 499 } 500 501 if (lgr->range.iomode == IOMODE_READ) 502 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 503 else 504 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 505 506 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]); 507 if (mirror != fls->mirror_array[i]) { 508 /* swap cred ptrs so free_mirror will clean up old */ 509 if (lgr->range.iomode == IOMODE_READ) { 510 cred = xchg(&mirror->ro_cred, cred); 511 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 512 } else { 513 cred = xchg(&mirror->rw_cred, cred); 514 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 515 } 516 ff_layout_free_mirror(fls->mirror_array[i]); 517 fls->mirror_array[i] = mirror; 518 } 519 520 dprintk("%s: iomode %s uid %u gid %u\n", __func__, 521 lgr->range.iomode == IOMODE_READ ? "READ" : "RW", 522 from_kuid(&init_user_ns, acred.uid), 523 from_kgid(&init_user_ns, acred.gid)); 524 } 525 526 p = xdr_inline_decode(&stream, 4); 527 if (!p) 528 goto out_sort_mirrors; 529 fls->flags = be32_to_cpup(p); 530 531 p = xdr_inline_decode(&stream, 4); 532 if (!p) 533 goto out_sort_mirrors; 534 for (i=0; i < fls->mirror_array_cnt; i++) 535 fls->mirror_array[i]->report_interval = be32_to_cpup(p); 536 537 out_sort_mirrors: 538 ff_layout_sort_mirrors(fls); 539 rc = ff_layout_check_layout(lgr); 540 if (rc) 541 goto out_err_free; 542 ret = &fls->generic_hdr; 543 dprintk("<-- %s (success)\n", __func__); 544 out_free_page: 545 __free_page(scratch); 546 return ret; 547 out_err_free: 548 _ff_layout_free_lseg(fls); 549 ret = ERR_PTR(rc); 550 dprintk("<-- %s (%d)\n", __func__, rc); 551 goto out_free_page; 552 } 553 554 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout) 555 { 556 struct pnfs_layout_segment *lseg; 557 558 list_for_each_entry(lseg, &layout->plh_segs, pls_list) 559 if (lseg->pls_range.iomode == IOMODE_RW) 560 return true; 561 562 return false; 563 } 564 565 static void 566 ff_layout_free_lseg(struct pnfs_layout_segment *lseg) 567 { 568 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 569 570 dprintk("--> %s\n", __func__); 571 572 if (lseg->pls_range.iomode == IOMODE_RW) { 573 struct nfs4_flexfile_layout *ffl; 574 struct inode *inode; 575 576 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout); 577 inode = ffl->generic_hdr.plh_inode; 578 spin_lock(&inode->i_lock); 579 if (!ff_layout_has_rw_segments(lseg->pls_layout)) { 580 ffl->commit_info.nbuckets = 0; 581 kfree(ffl->commit_info.buckets); 582 ffl->commit_info.buckets = NULL; 583 } 584 spin_unlock(&inode->i_lock); 585 } 586 _ff_layout_free_lseg(fls); 587 } 588 589 /* Return 1 until we have multiple lsegs support */ 590 static int 591 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls) 592 { 593 return 1; 594 } 595 596 static void 597 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 598 { 599 /* first IO request? */ 600 if (atomic_inc_return(&timer->n_ops) == 1) { 601 timer->start_time = now; 602 } 603 } 604 605 static ktime_t 606 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 607 { 608 ktime_t start; 609 610 if (atomic_dec_return(&timer->n_ops) < 0) 611 WARN_ON_ONCE(1); 612 613 start = timer->start_time; 614 timer->start_time = now; 615 return ktime_sub(now, start); 616 } 617 618 static bool 619 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 620 struct nfs4_ff_layoutstat *layoutstat, 621 ktime_t now) 622 { 623 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL; 624 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout); 625 626 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now); 627 if (!mirror->start_time) 628 mirror->start_time = now; 629 if (mirror->report_interval != 0) 630 report_interval = (s64)mirror->report_interval * 1000LL; 631 else if (layoutstats_timer != 0) 632 report_interval = (s64)layoutstats_timer * 1000LL; 633 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >= 634 report_interval) { 635 ffl->last_report_time = now; 636 return true; 637 } 638 639 return false; 640 } 641 642 static void 643 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat, 644 __u64 requested) 645 { 646 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 647 648 iostat->ops_requested++; 649 iostat->bytes_requested += requested; 650 } 651 652 static void 653 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat, 654 __u64 requested, 655 __u64 completed, 656 ktime_t time_completed, 657 ktime_t time_started) 658 { 659 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 660 ktime_t completion_time = ktime_sub(time_completed, time_started); 661 ktime_t timer; 662 663 iostat->ops_completed++; 664 iostat->bytes_completed += completed; 665 iostat->bytes_not_delivered += requested - completed; 666 667 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed); 668 iostat->total_busy_time = 669 ktime_add(iostat->total_busy_time, timer); 670 iostat->aggregate_completion_time = 671 ktime_add(iostat->aggregate_completion_time, 672 completion_time); 673 } 674 675 static void 676 nfs4_ff_layout_stat_io_start_read(struct inode *inode, 677 struct nfs4_ff_layout_mirror *mirror, 678 __u64 requested, ktime_t now) 679 { 680 bool report; 681 682 spin_lock(&mirror->lock); 683 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now); 684 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested); 685 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 686 spin_unlock(&mirror->lock); 687 688 if (report) 689 pnfs_report_layoutstat(inode, GFP_KERNEL); 690 } 691 692 static void 693 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task, 694 struct nfs4_ff_layout_mirror *mirror, 695 __u64 requested, 696 __u64 completed) 697 { 698 spin_lock(&mirror->lock); 699 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat, 700 requested, completed, 701 ktime_get(), task->tk_start); 702 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 703 spin_unlock(&mirror->lock); 704 } 705 706 static void 707 nfs4_ff_layout_stat_io_start_write(struct inode *inode, 708 struct nfs4_ff_layout_mirror *mirror, 709 __u64 requested, ktime_t now) 710 { 711 bool report; 712 713 spin_lock(&mirror->lock); 714 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now); 715 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested); 716 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 717 spin_unlock(&mirror->lock); 718 719 if (report) 720 pnfs_report_layoutstat(inode, GFP_NOIO); 721 } 722 723 static void 724 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, 725 struct nfs4_ff_layout_mirror *mirror, 726 __u64 requested, 727 __u64 completed, 728 enum nfs3_stable_how committed) 729 { 730 if (committed == NFS_UNSTABLE) 731 requested = completed = 0; 732 733 spin_lock(&mirror->lock); 734 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat, 735 requested, completed, ktime_get(), task->tk_start); 736 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 737 spin_unlock(&mirror->lock); 738 } 739 740 static int 741 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg, 742 struct nfs_commit_info *cinfo, 743 gfp_t gfp_flags) 744 { 745 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 746 struct pnfs_commit_bucket *buckets; 747 int size; 748 749 if (cinfo->ds->nbuckets != 0) { 750 /* This assumes there is only one RW lseg per file. 751 * To support multiple lseg per file, we need to 752 * change struct pnfs_commit_bucket to allow dynamic 753 * increasing nbuckets. 754 */ 755 return 0; 756 } 757 758 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg); 759 760 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket), 761 gfp_flags); 762 if (!buckets) 763 return -ENOMEM; 764 else { 765 int i; 766 767 spin_lock(&cinfo->inode->i_lock); 768 if (cinfo->ds->nbuckets != 0) 769 kfree(buckets); 770 else { 771 cinfo->ds->buckets = buckets; 772 cinfo->ds->nbuckets = size; 773 for (i = 0; i < size; i++) { 774 INIT_LIST_HEAD(&buckets[i].written); 775 INIT_LIST_HEAD(&buckets[i].committing); 776 /* mark direct verifier as unset */ 777 buckets[i].direct_verf.committed = 778 NFS_INVALID_STABLE_HOW; 779 } 780 } 781 spin_unlock(&cinfo->inode->i_lock); 782 return 0; 783 } 784 } 785 786 static struct nfs4_pnfs_ds * 787 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 788 int start_idx, 789 int *best_idx) 790 { 791 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 792 struct nfs4_pnfs_ds *ds; 793 bool fail_return = false; 794 int idx; 795 796 /* mirrors are sorted by efficiency */ 797 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 798 if (idx+1 == fls->mirror_array_cnt) 799 fail_return = true; 800 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return); 801 if (ds) { 802 *best_idx = idx; 803 return ds; 804 } 805 } 806 807 return NULL; 808 } 809 810 static void 811 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio, 812 struct nfs_page *req, 813 bool strict_iomode) 814 { 815 retry_strict: 816 pnfs_put_lseg(pgio->pg_lseg); 817 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 818 req->wb_context, 819 0, 820 NFS4_MAX_UINT64, 821 IOMODE_READ, 822 strict_iomode, 823 GFP_KERNEL); 824 if (IS_ERR(pgio->pg_lseg)) { 825 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 826 pgio->pg_lseg = NULL; 827 } 828 829 /* If we don't have checking, do get a IOMODE_RW 830 * segment, and the server wants to avoid READs 831 * there, then retry! 832 */ 833 if (pgio->pg_lseg && !strict_iomode && 834 ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 835 strict_iomode = true; 836 goto retry_strict; 837 } 838 } 839 840 static void 841 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 842 struct nfs_page *req) 843 { 844 struct nfs_pgio_mirror *pgm; 845 struct nfs4_ff_layout_mirror *mirror; 846 struct nfs4_pnfs_ds *ds; 847 int ds_idx; 848 849 retry: 850 pnfs_generic_pg_check_layout(pgio); 851 /* Use full layout for now */ 852 if (!pgio->pg_lseg) 853 ff_layout_pg_get_read(pgio, req, false); 854 else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) 855 ff_layout_pg_get_read(pgio, req, true); 856 857 /* If no lseg, fall back to read through mds */ 858 if (pgio->pg_lseg == NULL) 859 goto out_mds; 860 861 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx); 862 if (!ds) { 863 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 864 goto out_mds; 865 pnfs_put_lseg(pgio->pg_lseg); 866 pgio->pg_lseg = NULL; 867 /* Sleep for 1 second before retrying */ 868 ssleep(1); 869 goto retry; 870 } 871 872 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 873 874 pgio->pg_mirror_idx = ds_idx; 875 876 /* read always uses only one mirror - idx 0 for pgio layer */ 877 pgm = &pgio->pg_mirrors[0]; 878 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; 879 880 return; 881 out_mds: 882 pnfs_put_lseg(pgio->pg_lseg); 883 pgio->pg_lseg = NULL; 884 nfs_pageio_reset_read_mds(pgio); 885 } 886 887 static void 888 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 889 struct nfs_page *req) 890 { 891 struct nfs4_ff_layout_mirror *mirror; 892 struct nfs_pgio_mirror *pgm; 893 struct nfs_commit_info cinfo; 894 struct nfs4_pnfs_ds *ds; 895 int i; 896 int status; 897 898 retry: 899 pnfs_generic_pg_check_layout(pgio); 900 if (!pgio->pg_lseg) { 901 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 902 req->wb_context, 903 0, 904 NFS4_MAX_UINT64, 905 IOMODE_RW, 906 false, 907 GFP_NOFS); 908 if (IS_ERR(pgio->pg_lseg)) { 909 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 910 pgio->pg_lseg = NULL; 911 return; 912 } 913 } 914 /* If no lseg, fall back to write through mds */ 915 if (pgio->pg_lseg == NULL) 916 goto out_mds; 917 918 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq); 919 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS); 920 if (status < 0) 921 goto out_mds; 922 923 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 924 if (WARN_ON_ONCE(pgio->pg_mirror_count != 925 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))) 926 goto out_mds; 927 928 for (i = 0; i < pgio->pg_mirror_count; i++) { 929 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true); 930 if (!ds) { 931 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 932 goto out_mds; 933 pnfs_put_lseg(pgio->pg_lseg); 934 pgio->pg_lseg = NULL; 935 /* Sleep for 1 second before retrying */ 936 ssleep(1); 937 goto retry; 938 } 939 pgm = &pgio->pg_mirrors[i]; 940 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 941 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize; 942 } 943 944 return; 945 946 out_mds: 947 pnfs_put_lseg(pgio->pg_lseg); 948 pgio->pg_lseg = NULL; 949 nfs_pageio_reset_write_mds(pgio); 950 } 951 952 static unsigned int 953 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 954 struct nfs_page *req) 955 { 956 if (!pgio->pg_lseg) { 957 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 958 req->wb_context, 959 0, 960 NFS4_MAX_UINT64, 961 IOMODE_RW, 962 false, 963 GFP_NOFS); 964 if (IS_ERR(pgio->pg_lseg)) { 965 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 966 pgio->pg_lseg = NULL; 967 goto out; 968 } 969 } 970 if (pgio->pg_lseg) 971 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 972 973 /* no lseg means that pnfs is not in use, so no mirroring here */ 974 nfs_pageio_reset_write_mds(pgio); 975 out: 976 return 1; 977 } 978 979 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 980 .pg_init = ff_layout_pg_init_read, 981 .pg_test = pnfs_generic_pg_test, 982 .pg_doio = pnfs_generic_pg_readpages, 983 .pg_cleanup = pnfs_generic_pg_cleanup, 984 }; 985 986 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 987 .pg_init = ff_layout_pg_init_write, 988 .pg_test = pnfs_generic_pg_test, 989 .pg_doio = pnfs_generic_pg_writepages, 990 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 991 .pg_cleanup = pnfs_generic_pg_cleanup, 992 }; 993 994 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 995 { 996 struct rpc_task *task = &hdr->task; 997 998 pnfs_layoutcommit_inode(hdr->inode, false); 999 1000 if (retry_pnfs) { 1001 dprintk("%s Reset task %5u for i/o through pNFS " 1002 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1003 hdr->task.tk_pid, 1004 hdr->inode->i_sb->s_id, 1005 (unsigned long long)NFS_FILEID(hdr->inode), 1006 hdr->args.count, 1007 (unsigned long long)hdr->args.offset); 1008 1009 hdr->completion_ops->reschedule_io(hdr); 1010 return; 1011 } 1012 1013 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1014 dprintk("%s Reset task %5u for i/o through MDS " 1015 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1016 hdr->task.tk_pid, 1017 hdr->inode->i_sb->s_id, 1018 (unsigned long long)NFS_FILEID(hdr->inode), 1019 hdr->args.count, 1020 (unsigned long long)hdr->args.offset); 1021 1022 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1023 } 1024 } 1025 1026 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1027 { 1028 struct rpc_task *task = &hdr->task; 1029 1030 pnfs_layoutcommit_inode(hdr->inode, false); 1031 1032 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1033 dprintk("%s Reset task %5u for i/o through MDS " 1034 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1035 hdr->task.tk_pid, 1036 hdr->inode->i_sb->s_id, 1037 (unsigned long long)NFS_FILEID(hdr->inode), 1038 hdr->args.count, 1039 (unsigned long long)hdr->args.offset); 1040 1041 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1042 } 1043 } 1044 1045 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1046 struct nfs4_state *state, 1047 struct nfs_client *clp, 1048 struct pnfs_layout_segment *lseg, 1049 int idx) 1050 { 1051 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1052 struct inode *inode = lo->plh_inode; 1053 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1054 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1055 1056 switch (task->tk_status) { 1057 case -NFS4ERR_BADSESSION: 1058 case -NFS4ERR_BADSLOT: 1059 case -NFS4ERR_BAD_HIGH_SLOT: 1060 case -NFS4ERR_DEADSESSION: 1061 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1062 case -NFS4ERR_SEQ_FALSE_RETRY: 1063 case -NFS4ERR_SEQ_MISORDERED: 1064 dprintk("%s ERROR %d, Reset session. Exchangeid " 1065 "flags 0x%x\n", __func__, task->tk_status, 1066 clp->cl_exchange_flags); 1067 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1068 break; 1069 case -NFS4ERR_DELAY: 1070 case -NFS4ERR_GRACE: 1071 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1072 break; 1073 case -NFS4ERR_RETRY_UNCACHED_REP: 1074 break; 1075 /* Invalidate Layout errors */ 1076 case -NFS4ERR_PNFS_NO_LAYOUT: 1077 case -ESTALE: /* mapped NFS4ERR_STALE */ 1078 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 1079 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 1080 case -NFS4ERR_FHEXPIRED: 1081 case -NFS4ERR_WRONG_TYPE: 1082 dprintk("%s Invalid layout error %d\n", __func__, 1083 task->tk_status); 1084 /* 1085 * Destroy layout so new i/o will get a new layout. 1086 * Layout will not be destroyed until all current lseg 1087 * references are put. Mark layout as invalid to resend failed 1088 * i/o and all i/o waiting on the slot table to the MDS until 1089 * layout is destroyed and a new valid layout is obtained. 1090 */ 1091 pnfs_destroy_layout(NFS_I(inode)); 1092 rpc_wake_up(&tbl->slot_tbl_waitq); 1093 goto reset; 1094 /* RPC connection errors */ 1095 case -ECONNREFUSED: 1096 case -EHOSTDOWN: 1097 case -EHOSTUNREACH: 1098 case -ENETUNREACH: 1099 case -EIO: 1100 case -ETIMEDOUT: 1101 case -EPIPE: 1102 dprintk("%s DS connection error %d\n", __func__, 1103 task->tk_status); 1104 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1105 &devid->deviceid); 1106 rpc_wake_up(&tbl->slot_tbl_waitq); 1107 /* fall through */ 1108 default: 1109 if (ff_layout_avoid_mds_available_ds(lseg)) 1110 return -NFS4ERR_RESET_TO_PNFS; 1111 reset: 1112 dprintk("%s Retry through MDS. Error %d\n", __func__, 1113 task->tk_status); 1114 return -NFS4ERR_RESET_TO_MDS; 1115 } 1116 task->tk_status = 0; 1117 return -EAGAIN; 1118 } 1119 1120 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1121 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1122 struct pnfs_layout_segment *lseg, 1123 int idx) 1124 { 1125 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1126 1127 switch (task->tk_status) { 1128 /* File access problems. Don't mark the device as unavailable */ 1129 case -EACCES: 1130 case -ESTALE: 1131 case -EISDIR: 1132 case -EBADHANDLE: 1133 case -ELOOP: 1134 case -ENOSPC: 1135 break; 1136 case -EJUKEBOX: 1137 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1138 goto out_retry; 1139 default: 1140 dprintk("%s DS connection error %d\n", __func__, 1141 task->tk_status); 1142 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1143 &devid->deviceid); 1144 } 1145 /* FIXME: Need to prevent infinite looping here. */ 1146 return -NFS4ERR_RESET_TO_PNFS; 1147 out_retry: 1148 task->tk_status = 0; 1149 rpc_restart_call_prepare(task); 1150 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1151 return -EAGAIN; 1152 } 1153 1154 static int ff_layout_async_handle_error(struct rpc_task *task, 1155 struct nfs4_state *state, 1156 struct nfs_client *clp, 1157 struct pnfs_layout_segment *lseg, 1158 int idx) 1159 { 1160 int vers = clp->cl_nfs_mod->rpc_vers->number; 1161 1162 if (task->tk_status >= 0) 1163 return 0; 1164 1165 /* Handle the case of an invalid layout segment */ 1166 if (!pnfs_is_valid_lseg(lseg)) 1167 return -NFS4ERR_RESET_TO_PNFS; 1168 1169 switch (vers) { 1170 case 3: 1171 return ff_layout_async_handle_error_v3(task, lseg, idx); 1172 case 4: 1173 return ff_layout_async_handle_error_v4(task, state, clp, 1174 lseg, idx); 1175 default: 1176 /* should never happen */ 1177 WARN_ON_ONCE(1); 1178 return 0; 1179 } 1180 } 1181 1182 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1183 int idx, u64 offset, u64 length, 1184 u32 status, int opnum, int error) 1185 { 1186 struct nfs4_ff_layout_mirror *mirror; 1187 int err; 1188 1189 if (status == 0) { 1190 switch (error) { 1191 case -ETIMEDOUT: 1192 case -EPFNOSUPPORT: 1193 case -EPROTONOSUPPORT: 1194 case -EOPNOTSUPP: 1195 case -ECONNREFUSED: 1196 case -ECONNRESET: 1197 case -EHOSTDOWN: 1198 case -EHOSTUNREACH: 1199 case -ENETUNREACH: 1200 case -EADDRINUSE: 1201 case -ENOBUFS: 1202 case -EPIPE: 1203 case -EPERM: 1204 status = NFS4ERR_NXIO; 1205 break; 1206 case -EACCES: 1207 status = NFS4ERR_ACCESS; 1208 break; 1209 default: 1210 return; 1211 } 1212 } 1213 1214 switch (status) { 1215 case NFS4ERR_DELAY: 1216 case NFS4ERR_GRACE: 1217 return; 1218 default: 1219 break; 1220 } 1221 1222 mirror = FF_LAYOUT_COMP(lseg, idx); 1223 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1224 mirror, offset, length, status, opnum, 1225 GFP_NOIO); 1226 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg); 1227 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1228 } 1229 1230 /* NFS_PROTO call done callback routines */ 1231 static int ff_layout_read_done_cb(struct rpc_task *task, 1232 struct nfs_pgio_header *hdr) 1233 { 1234 int err; 1235 1236 trace_nfs4_pnfs_read(hdr, task->tk_status); 1237 if (task->tk_status < 0) 1238 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1239 hdr->args.offset, hdr->args.count, 1240 hdr->res.op_status, OP_READ, 1241 task->tk_status); 1242 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1243 hdr->ds_clp, hdr->lseg, 1244 hdr->pgio_mirror_idx); 1245 1246 switch (err) { 1247 case -NFS4ERR_RESET_TO_PNFS: 1248 if (ff_layout_choose_best_ds_for_read(hdr->lseg, 1249 hdr->pgio_mirror_idx + 1, 1250 &hdr->pgio_mirror_idx)) 1251 goto out_eagain; 1252 ff_layout_read_record_layoutstats_done(task, hdr); 1253 pnfs_read_resend_pnfs(hdr); 1254 return task->tk_status; 1255 case -NFS4ERR_RESET_TO_MDS: 1256 ff_layout_reset_read(hdr); 1257 return task->tk_status; 1258 case -EAGAIN: 1259 goto out_eagain; 1260 } 1261 1262 return 0; 1263 out_eagain: 1264 rpc_restart_call_prepare(task); 1265 return -EAGAIN; 1266 } 1267 1268 static bool 1269 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1270 { 1271 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1272 } 1273 1274 /* 1275 * We reference the rpc_cred of the first WRITE that triggers the need for 1276 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1277 * rfc5661 is not clear about which credential should be used. 1278 * 1279 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1280 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1281 * we always send layoutcommit after DS writes. 1282 */ 1283 static void 1284 ff_layout_set_layoutcommit(struct inode *inode, 1285 struct pnfs_layout_segment *lseg, 1286 loff_t end_offset) 1287 { 1288 if (!ff_layout_need_layoutcommit(lseg)) 1289 return; 1290 1291 pnfs_set_layoutcommit(inode, lseg, end_offset); 1292 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1293 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1294 } 1295 1296 static bool 1297 ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx) 1298 { 1299 /* No mirroring for now */ 1300 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx); 1301 1302 return ff_layout_test_devid_unavailable(node); 1303 } 1304 1305 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1306 struct nfs_pgio_header *hdr) 1307 { 1308 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1309 return; 1310 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1311 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1312 hdr->args.count, 1313 task->tk_start); 1314 } 1315 1316 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1317 struct nfs_pgio_header *hdr) 1318 { 1319 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1320 return; 1321 nfs4_ff_layout_stat_io_end_read(task, 1322 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1323 hdr->args.count, 1324 hdr->res.count); 1325 } 1326 1327 static int ff_layout_read_prepare_common(struct rpc_task *task, 1328 struct nfs_pgio_header *hdr) 1329 { 1330 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1331 rpc_exit(task, -EIO); 1332 return -EIO; 1333 } 1334 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) { 1335 rpc_exit(task, -EHOSTDOWN); 1336 return -EAGAIN; 1337 } 1338 1339 ff_layout_read_record_layoutstats_start(task, hdr); 1340 return 0; 1341 } 1342 1343 /* 1344 * Call ops for the async read/write cases 1345 * In the case of dense layouts, the offset needs to be reset to its 1346 * original value. 1347 */ 1348 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1349 { 1350 struct nfs_pgio_header *hdr = data; 1351 1352 if (ff_layout_read_prepare_common(task, hdr)) 1353 return; 1354 1355 rpc_call_start(task); 1356 } 1357 1358 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1359 { 1360 struct nfs_pgio_header *hdr = data; 1361 1362 if (nfs4_setup_sequence(hdr->ds_clp, 1363 &hdr->args.seq_args, 1364 &hdr->res.seq_res, 1365 task)) 1366 return; 1367 1368 if (ff_layout_read_prepare_common(task, hdr)) 1369 return; 1370 1371 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 1372 hdr->args.lock_context, FMODE_READ) == -EIO) 1373 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 1374 } 1375 1376 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1377 { 1378 struct nfs_pgio_header *hdr = data; 1379 1380 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 1381 1382 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1383 task->tk_status == 0) { 1384 nfs4_sequence_done(task, &hdr->res.seq_res); 1385 return; 1386 } 1387 1388 /* Note this may cause RPC to be resent */ 1389 hdr->mds_ops->rpc_call_done(task, hdr); 1390 } 1391 1392 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1393 { 1394 struct nfs_pgio_header *hdr = data; 1395 1396 ff_layout_read_record_layoutstats_done(task, hdr); 1397 rpc_count_iostats_metrics(task, 1398 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1399 } 1400 1401 static void ff_layout_read_release(void *data) 1402 { 1403 struct nfs_pgio_header *hdr = data; 1404 1405 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1406 pnfs_generic_rw_release(data); 1407 } 1408 1409 1410 static int ff_layout_write_done_cb(struct rpc_task *task, 1411 struct nfs_pgio_header *hdr) 1412 { 1413 loff_t end_offs = 0; 1414 int err; 1415 1416 trace_nfs4_pnfs_write(hdr, task->tk_status); 1417 if (task->tk_status < 0) 1418 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1419 hdr->args.offset, hdr->args.count, 1420 hdr->res.op_status, OP_WRITE, 1421 task->tk_status); 1422 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1423 hdr->ds_clp, hdr->lseg, 1424 hdr->pgio_mirror_idx); 1425 1426 switch (err) { 1427 case -NFS4ERR_RESET_TO_PNFS: 1428 ff_layout_reset_write(hdr, true); 1429 return task->tk_status; 1430 case -NFS4ERR_RESET_TO_MDS: 1431 ff_layout_reset_write(hdr, false); 1432 return task->tk_status; 1433 case -EAGAIN: 1434 return -EAGAIN; 1435 } 1436 1437 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1438 hdr->res.verf->committed == NFS_DATA_SYNC) 1439 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1440 1441 /* Note: if the write is unstable, don't set end_offs until commit */ 1442 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1443 1444 /* zero out fattr since we don't care DS attr at all */ 1445 hdr->fattr.valid = 0; 1446 if (task->tk_status >= 0) 1447 nfs_writeback_update_inode(hdr); 1448 1449 return 0; 1450 } 1451 1452 static int ff_layout_commit_done_cb(struct rpc_task *task, 1453 struct nfs_commit_data *data) 1454 { 1455 int err; 1456 1457 trace_nfs4_pnfs_commit_ds(data, task->tk_status); 1458 if (task->tk_status < 0) 1459 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index, 1460 data->args.offset, data->args.count, 1461 data->res.op_status, OP_COMMIT, 1462 task->tk_status); 1463 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1464 data->lseg, data->ds_commit_index); 1465 1466 switch (err) { 1467 case -NFS4ERR_RESET_TO_PNFS: 1468 pnfs_generic_prepare_to_resend_writes(data); 1469 return -EAGAIN; 1470 case -NFS4ERR_RESET_TO_MDS: 1471 pnfs_generic_prepare_to_resend_writes(data); 1472 return -EAGAIN; 1473 case -EAGAIN: 1474 rpc_restart_call_prepare(task); 1475 return -EAGAIN; 1476 } 1477 1478 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1479 1480 return 0; 1481 } 1482 1483 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1484 struct nfs_pgio_header *hdr) 1485 { 1486 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1487 return; 1488 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1489 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1490 hdr->args.count, 1491 task->tk_start); 1492 } 1493 1494 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1495 struct nfs_pgio_header *hdr) 1496 { 1497 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1498 return; 1499 nfs4_ff_layout_stat_io_end_write(task, 1500 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1501 hdr->args.count, hdr->res.count, 1502 hdr->res.verf->committed); 1503 } 1504 1505 static int ff_layout_write_prepare_common(struct rpc_task *task, 1506 struct nfs_pgio_header *hdr) 1507 { 1508 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1509 rpc_exit(task, -EIO); 1510 return -EIO; 1511 } 1512 1513 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) { 1514 rpc_exit(task, -EHOSTDOWN); 1515 return -EAGAIN; 1516 } 1517 1518 ff_layout_write_record_layoutstats_start(task, hdr); 1519 return 0; 1520 } 1521 1522 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1523 { 1524 struct nfs_pgio_header *hdr = data; 1525 1526 if (ff_layout_write_prepare_common(task, hdr)) 1527 return; 1528 1529 rpc_call_start(task); 1530 } 1531 1532 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1533 { 1534 struct nfs_pgio_header *hdr = data; 1535 1536 if (nfs4_setup_sequence(hdr->ds_clp, 1537 &hdr->args.seq_args, 1538 &hdr->res.seq_res, 1539 task)) 1540 return; 1541 1542 if (ff_layout_write_prepare_common(task, hdr)) 1543 return; 1544 1545 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 1546 hdr->args.lock_context, FMODE_WRITE) == -EIO) 1547 rpc_exit(task, -EIO); /* lost lock, terminate I/O */ 1548 } 1549 1550 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1551 { 1552 struct nfs_pgio_header *hdr = data; 1553 1554 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1555 task->tk_status == 0) { 1556 nfs4_sequence_done(task, &hdr->res.seq_res); 1557 return; 1558 } 1559 1560 /* Note this may cause RPC to be resent */ 1561 hdr->mds_ops->rpc_call_done(task, hdr); 1562 } 1563 1564 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1565 { 1566 struct nfs_pgio_header *hdr = data; 1567 1568 ff_layout_write_record_layoutstats_done(task, hdr); 1569 rpc_count_iostats_metrics(task, 1570 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1571 } 1572 1573 static void ff_layout_write_release(void *data) 1574 { 1575 struct nfs_pgio_header *hdr = data; 1576 1577 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1578 pnfs_generic_rw_release(data); 1579 } 1580 1581 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1582 struct nfs_commit_data *cdata) 1583 { 1584 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1585 return; 1586 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1587 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1588 0, task->tk_start); 1589 } 1590 1591 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1592 struct nfs_commit_data *cdata) 1593 { 1594 struct nfs_page *req; 1595 __u64 count = 0; 1596 1597 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1598 return; 1599 1600 if (task->tk_status == 0) { 1601 list_for_each_entry(req, &cdata->pages, wb_list) 1602 count += req->wb_bytes; 1603 } 1604 nfs4_ff_layout_stat_io_end_write(task, 1605 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1606 count, count, NFS_FILE_SYNC); 1607 } 1608 1609 static void ff_layout_commit_prepare_common(struct rpc_task *task, 1610 struct nfs_commit_data *cdata) 1611 { 1612 ff_layout_commit_record_layoutstats_start(task, cdata); 1613 } 1614 1615 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1616 { 1617 ff_layout_commit_prepare_common(task, data); 1618 rpc_call_start(task); 1619 } 1620 1621 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1622 { 1623 struct nfs_commit_data *wdata = data; 1624 1625 if (nfs4_setup_sequence(wdata->ds_clp, 1626 &wdata->args.seq_args, 1627 &wdata->res.seq_res, 1628 task)) 1629 return; 1630 ff_layout_commit_prepare_common(task, data); 1631 } 1632 1633 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1634 { 1635 pnfs_generic_write_commit_done(task, data); 1636 } 1637 1638 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1639 { 1640 struct nfs_commit_data *cdata = data; 1641 1642 ff_layout_commit_record_layoutstats_done(task, cdata); 1643 rpc_count_iostats_metrics(task, 1644 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1645 } 1646 1647 static void ff_layout_commit_release(void *data) 1648 { 1649 struct nfs_commit_data *cdata = data; 1650 1651 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1652 pnfs_generic_commit_release(data); 1653 } 1654 1655 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1656 .rpc_call_prepare = ff_layout_read_prepare_v3, 1657 .rpc_call_done = ff_layout_read_call_done, 1658 .rpc_count_stats = ff_layout_read_count_stats, 1659 .rpc_release = ff_layout_read_release, 1660 }; 1661 1662 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 1663 .rpc_call_prepare = ff_layout_read_prepare_v4, 1664 .rpc_call_done = ff_layout_read_call_done, 1665 .rpc_count_stats = ff_layout_read_count_stats, 1666 .rpc_release = ff_layout_read_release, 1667 }; 1668 1669 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1670 .rpc_call_prepare = ff_layout_write_prepare_v3, 1671 .rpc_call_done = ff_layout_write_call_done, 1672 .rpc_count_stats = ff_layout_write_count_stats, 1673 .rpc_release = ff_layout_write_release, 1674 }; 1675 1676 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1677 .rpc_call_prepare = ff_layout_write_prepare_v4, 1678 .rpc_call_done = ff_layout_write_call_done, 1679 .rpc_count_stats = ff_layout_write_count_stats, 1680 .rpc_release = ff_layout_write_release, 1681 }; 1682 1683 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 1684 .rpc_call_prepare = ff_layout_commit_prepare_v3, 1685 .rpc_call_done = ff_layout_commit_done, 1686 .rpc_count_stats = ff_layout_commit_count_stats, 1687 .rpc_release = ff_layout_commit_release, 1688 }; 1689 1690 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 1691 .rpc_call_prepare = ff_layout_commit_prepare_v4, 1692 .rpc_call_done = ff_layout_commit_done, 1693 .rpc_count_stats = ff_layout_commit_count_stats, 1694 .rpc_release = ff_layout_commit_release, 1695 }; 1696 1697 static enum pnfs_try_status 1698 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 1699 { 1700 struct pnfs_layout_segment *lseg = hdr->lseg; 1701 struct nfs4_pnfs_ds *ds; 1702 struct rpc_clnt *ds_clnt; 1703 struct rpc_cred *ds_cred; 1704 loff_t offset = hdr->args.offset; 1705 u32 idx = hdr->pgio_mirror_idx; 1706 int vers; 1707 struct nfs_fh *fh; 1708 1709 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 1710 __func__, hdr->inode->i_ino, 1711 hdr->args.pgbase, (size_t)hdr->args.count, offset); 1712 1713 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false); 1714 if (!ds) 1715 goto out_failed; 1716 1717 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp, 1718 hdr->inode); 1719 if (IS_ERR(ds_clnt)) 1720 goto out_failed; 1721 1722 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred); 1723 if (!ds_cred) 1724 goto out_failed; 1725 1726 vers = nfs4_ff_layout_ds_version(lseg, idx); 1727 1728 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 1729 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 1730 1731 hdr->pgio_done_cb = ff_layout_read_done_cb; 1732 refcount_inc(&ds->ds_clp->cl_count); 1733 hdr->ds_clp = ds->ds_clp; 1734 fh = nfs4_ff_layout_select_ds_fh(lseg, idx); 1735 if (fh) 1736 hdr->args.fh = fh; 1737 /* 1738 * Note that if we ever decide to split across DSes, 1739 * then we may need to handle dense-like offsets. 1740 */ 1741 hdr->args.offset = offset; 1742 hdr->mds_offset = offset; 1743 1744 /* Perform an asynchronous read to ds */ 1745 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1746 vers == 3 ? &ff_layout_read_call_ops_v3 : 1747 &ff_layout_read_call_ops_v4, 1748 0, RPC_TASK_SOFTCONN); 1749 put_rpccred(ds_cred); 1750 return PNFS_ATTEMPTED; 1751 1752 out_failed: 1753 if (ff_layout_avoid_mds_available_ds(lseg)) 1754 return PNFS_TRY_AGAIN; 1755 return PNFS_NOT_ATTEMPTED; 1756 } 1757 1758 /* Perform async writes. */ 1759 static enum pnfs_try_status 1760 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 1761 { 1762 struct pnfs_layout_segment *lseg = hdr->lseg; 1763 struct nfs4_pnfs_ds *ds; 1764 struct rpc_clnt *ds_clnt; 1765 struct rpc_cred *ds_cred; 1766 loff_t offset = hdr->args.offset; 1767 int vers; 1768 struct nfs_fh *fh; 1769 int idx = hdr->pgio_mirror_idx; 1770 1771 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true); 1772 if (!ds) 1773 goto out_failed; 1774 1775 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp, 1776 hdr->inode); 1777 if (IS_ERR(ds_clnt)) 1778 goto out_failed; 1779 1780 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred); 1781 if (!ds_cred) 1782 goto out_failed; 1783 1784 vers = nfs4_ff_layout_ds_version(lseg, idx); 1785 1786 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 1787 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 1788 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 1789 vers); 1790 1791 hdr->pgio_done_cb = ff_layout_write_done_cb; 1792 refcount_inc(&ds->ds_clp->cl_count); 1793 hdr->ds_clp = ds->ds_clp; 1794 hdr->ds_commit_idx = idx; 1795 fh = nfs4_ff_layout_select_ds_fh(lseg, idx); 1796 if (fh) 1797 hdr->args.fh = fh; 1798 1799 /* 1800 * Note that if we ever decide to split across DSes, 1801 * then we may need to handle dense-like offsets. 1802 */ 1803 hdr->args.offset = offset; 1804 1805 /* Perform an asynchronous write */ 1806 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1807 vers == 3 ? &ff_layout_write_call_ops_v3 : 1808 &ff_layout_write_call_ops_v4, 1809 sync, RPC_TASK_SOFTCONN); 1810 put_rpccred(ds_cred); 1811 return PNFS_ATTEMPTED; 1812 1813 out_failed: 1814 if (ff_layout_avoid_mds_available_ds(lseg)) 1815 return PNFS_TRY_AGAIN; 1816 return PNFS_NOT_ATTEMPTED; 1817 } 1818 1819 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1820 { 1821 return i; 1822 } 1823 1824 static struct nfs_fh * 1825 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1826 { 1827 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1828 1829 /* FIXME: Assume that there is only one NFS version available 1830 * for the DS. 1831 */ 1832 return &flseg->mirror_array[i]->fh_versions[0]; 1833 } 1834 1835 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 1836 { 1837 struct pnfs_layout_segment *lseg = data->lseg; 1838 struct nfs4_pnfs_ds *ds; 1839 struct rpc_clnt *ds_clnt; 1840 struct rpc_cred *ds_cred; 1841 u32 idx; 1842 int vers, ret; 1843 struct nfs_fh *fh; 1844 1845 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 1846 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 1847 goto out_err; 1848 1849 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1850 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true); 1851 if (!ds) 1852 goto out_err; 1853 1854 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp, 1855 data->inode); 1856 if (IS_ERR(ds_clnt)) 1857 goto out_err; 1858 1859 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred); 1860 if (!ds_cred) 1861 goto out_err; 1862 1863 vers = nfs4_ff_layout_ds_version(lseg, idx); 1864 1865 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 1866 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 1867 vers); 1868 data->commit_done_cb = ff_layout_commit_done_cb; 1869 data->cred = ds_cred; 1870 refcount_inc(&ds->ds_clp->cl_count); 1871 data->ds_clp = ds->ds_clp; 1872 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1873 if (fh) 1874 data->args.fh = fh; 1875 1876 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 1877 vers == 3 ? &ff_layout_commit_call_ops_v3 : 1878 &ff_layout_commit_call_ops_v4, 1879 how, RPC_TASK_SOFTCONN); 1880 put_rpccred(ds_cred); 1881 return ret; 1882 out_err: 1883 pnfs_generic_prepare_to_resend_writes(data); 1884 pnfs_generic_commit_release(data); 1885 return -EAGAIN; 1886 } 1887 1888 static int 1889 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1890 int how, struct nfs_commit_info *cinfo) 1891 { 1892 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1893 ff_layout_initiate_commit); 1894 } 1895 1896 static struct pnfs_ds_commit_info * 1897 ff_layout_get_ds_info(struct inode *inode) 1898 { 1899 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1900 1901 if (layout == NULL) 1902 return NULL; 1903 1904 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 1905 } 1906 1907 static void 1908 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 1909 { 1910 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 1911 id_node)); 1912 } 1913 1914 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 1915 const struct nfs4_layoutreturn_args *args, 1916 const struct nfs4_flexfile_layoutreturn_args *ff_args) 1917 { 1918 __be32 *start; 1919 1920 start = xdr_reserve_space(xdr, 4); 1921 if (unlikely(!start)) 1922 return -E2BIG; 1923 1924 *start = cpu_to_be32(ff_args->num_errors); 1925 /* This assume we always return _ALL_ layouts */ 1926 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 1927 } 1928 1929 static void 1930 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len) 1931 { 1932 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0); 1933 } 1934 1935 static void 1936 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 1937 const nfs4_stateid *stateid, 1938 const struct nfs42_layoutstat_devinfo *devinfo) 1939 { 1940 __be32 *p; 1941 1942 p = xdr_reserve_space(xdr, 8 + 8); 1943 p = xdr_encode_hyper(p, devinfo->offset); 1944 p = xdr_encode_hyper(p, devinfo->length); 1945 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 1946 p = xdr_reserve_space(xdr, 4*8); 1947 p = xdr_encode_hyper(p, devinfo->read_count); 1948 p = xdr_encode_hyper(p, devinfo->read_bytes); 1949 p = xdr_encode_hyper(p, devinfo->write_count); 1950 p = xdr_encode_hyper(p, devinfo->write_bytes); 1951 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 1952 } 1953 1954 static void 1955 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 1956 const nfs4_stateid *stateid, 1957 const struct nfs42_layoutstat_devinfo *devinfo) 1958 { 1959 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 1960 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 1961 devinfo->ld_private.data); 1962 } 1963 1964 /* report nothing for now */ 1965 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 1966 const struct nfs4_layoutreturn_args *args, 1967 struct nfs4_flexfile_layoutreturn_args *ff_args) 1968 { 1969 __be32 *p; 1970 int i; 1971 1972 p = xdr_reserve_space(xdr, 4); 1973 *p = cpu_to_be32(ff_args->num_dev); 1974 for (i = 0; i < ff_args->num_dev; i++) 1975 ff_layout_encode_ff_iostat(xdr, 1976 &args->layout->plh_stateid, 1977 &ff_args->devinfo[i]); 1978 } 1979 1980 static void 1981 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 1982 unsigned int num_entries) 1983 { 1984 unsigned int i; 1985 1986 for (i = 0; i < num_entries; i++) { 1987 if (!devinfo[i].ld_private.ops) 1988 continue; 1989 if (!devinfo[i].ld_private.ops->free) 1990 continue; 1991 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 1992 } 1993 } 1994 1995 static struct nfs4_deviceid_node * 1996 ff_layout_alloc_deviceid_node(struct nfs_server *server, 1997 struct pnfs_device *pdev, gfp_t gfp_flags) 1998 { 1999 struct nfs4_ff_layout_ds *dsaddr; 2000 2001 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2002 if (!dsaddr) 2003 return NULL; 2004 return &dsaddr->id_node; 2005 } 2006 2007 static void 2008 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2009 const void *voidargs, 2010 const struct nfs4_xdr_opaque_data *ff_opaque) 2011 { 2012 const struct nfs4_layoutreturn_args *args = voidargs; 2013 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2014 struct xdr_buf tmp_buf = { 2015 .head = { 2016 [0] = { 2017 .iov_base = page_address(ff_args->pages[0]), 2018 }, 2019 }, 2020 .buflen = PAGE_SIZE, 2021 }; 2022 struct xdr_stream tmp_xdr; 2023 __be32 *start; 2024 2025 dprintk("%s: Begin\n", __func__); 2026 2027 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL); 2028 2029 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2030 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2031 2032 start = xdr_reserve_space(xdr, 4); 2033 *start = cpu_to_be32(tmp_buf.len); 2034 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2035 2036 dprintk("%s: Return\n", __func__); 2037 } 2038 2039 static void 2040 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2041 { 2042 struct nfs4_flexfile_layoutreturn_args *ff_args; 2043 2044 if (!args->data) 2045 return; 2046 ff_args = args->data; 2047 args->data = NULL; 2048 2049 ff_layout_free_ds_ioerr(&ff_args->errors); 2050 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2051 2052 put_page(ff_args->pages[0]); 2053 kfree(ff_args); 2054 } 2055 2056 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2057 .encode = ff_layout_encode_layoutreturn, 2058 .free = ff_layout_free_layoutreturn, 2059 }; 2060 2061 static int 2062 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2063 { 2064 struct nfs4_flexfile_layoutreturn_args *ff_args; 2065 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2066 2067 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL); 2068 if (!ff_args) 2069 goto out_nomem; 2070 ff_args->pages[0] = alloc_page(GFP_KERNEL); 2071 if (!ff_args->pages[0]) 2072 goto out_nomem_free; 2073 2074 INIT_LIST_HEAD(&ff_args->errors); 2075 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2076 &args->range, &ff_args->errors, 2077 FF_LAYOUTRETURN_MAXERR); 2078 2079 spin_lock(&args->inode->i_lock); 2080 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2081 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo)); 2082 spin_unlock(&args->inode->i_lock); 2083 2084 args->ld_private->ops = &layoutreturn_ops; 2085 args->ld_private->data = ff_args; 2086 return 0; 2087 out_nomem_free: 2088 kfree(ff_args); 2089 out_nomem: 2090 return -ENOMEM; 2091 } 2092 2093 static int 2094 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2095 { 2096 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2097 2098 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2099 } 2100 2101 static size_t 2102 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2103 const int buflen) 2104 { 2105 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2106 const struct in6_addr *addr = &sin6->sin6_addr; 2107 2108 /* 2109 * RFC 4291, Section 2.2.2 2110 * 2111 * Shorthanded ANY address 2112 */ 2113 if (ipv6_addr_any(addr)) 2114 return snprintf(buf, buflen, "::"); 2115 2116 /* 2117 * RFC 4291, Section 2.2.2 2118 * 2119 * Shorthanded loopback address 2120 */ 2121 if (ipv6_addr_loopback(addr)) 2122 return snprintf(buf, buflen, "::1"); 2123 2124 /* 2125 * RFC 4291, Section 2.2.3 2126 * 2127 * Special presentation address format for mapped v4 2128 * addresses. 2129 */ 2130 if (ipv6_addr_v4mapped(addr)) 2131 return snprintf(buf, buflen, "::ffff:%pI4", 2132 &addr->s6_addr32[3]); 2133 2134 /* 2135 * RFC 4291, Section 2.2.1 2136 */ 2137 return snprintf(buf, buflen, "%pI6c", addr); 2138 } 2139 2140 /* Derived from rpc_sockaddr2uaddr */ 2141 static void 2142 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2143 { 2144 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2145 char portbuf[RPCBIND_MAXUADDRPLEN]; 2146 char addrbuf[RPCBIND_MAXUADDRLEN]; 2147 char *netid; 2148 unsigned short port; 2149 int len, netid_len; 2150 __be32 *p; 2151 2152 switch (sap->sa_family) { 2153 case AF_INET: 2154 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2155 return; 2156 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2157 netid = "tcp"; 2158 netid_len = 3; 2159 break; 2160 case AF_INET6: 2161 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2162 return; 2163 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2164 netid = "tcp6"; 2165 netid_len = 4; 2166 break; 2167 default: 2168 /* we only support tcp and tcp6 */ 2169 WARN_ON_ONCE(1); 2170 return; 2171 } 2172 2173 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2174 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2175 2176 p = xdr_reserve_space(xdr, 4 + netid_len); 2177 xdr_encode_opaque(p, netid, netid_len); 2178 2179 p = xdr_reserve_space(xdr, 4 + len); 2180 xdr_encode_opaque(p, addrbuf, len); 2181 } 2182 2183 static void 2184 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2185 ktime_t t) 2186 { 2187 struct timespec64 ts; 2188 __be32 *p; 2189 2190 p = xdr_reserve_space(xdr, 12); 2191 ts = ktime_to_timespec64(t); 2192 p = xdr_encode_hyper(p, ts.tv_sec); 2193 *p++ = cpu_to_be32(ts.tv_nsec); 2194 } 2195 2196 static void 2197 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2198 struct nfs4_ff_io_stat *stat) 2199 { 2200 __be32 *p; 2201 2202 p = xdr_reserve_space(xdr, 5 * 8); 2203 p = xdr_encode_hyper(p, stat->ops_requested); 2204 p = xdr_encode_hyper(p, stat->bytes_requested); 2205 p = xdr_encode_hyper(p, stat->ops_completed); 2206 p = xdr_encode_hyper(p, stat->bytes_completed); 2207 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2208 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2209 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2210 } 2211 2212 static void 2213 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2214 const struct nfs42_layoutstat_devinfo *devinfo, 2215 struct nfs4_ff_layout_mirror *mirror) 2216 { 2217 struct nfs4_pnfs_ds_addr *da; 2218 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds; 2219 struct nfs_fh *fh = &mirror->fh_versions[0]; 2220 __be32 *p; 2221 2222 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2223 dprintk("%s: DS %s: encoding address %s\n", 2224 __func__, ds->ds_remotestr, da->da_remotestr); 2225 /* netaddr4 */ 2226 ff_layout_encode_netaddr(xdr, da); 2227 /* nfs_fh4 */ 2228 p = xdr_reserve_space(xdr, 4 + fh->size); 2229 xdr_encode_opaque(p, fh->data, fh->size); 2230 /* ff_io_latency4 read */ 2231 spin_lock(&mirror->lock); 2232 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat); 2233 /* ff_io_latency4 write */ 2234 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat); 2235 spin_unlock(&mirror->lock); 2236 /* nfstime4 */ 2237 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time)); 2238 /* bool */ 2239 p = xdr_reserve_space(xdr, 4); 2240 *p = cpu_to_be32(false); 2241 } 2242 2243 static void 2244 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2245 const struct nfs4_xdr_opaque_data *opaque) 2246 { 2247 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2248 struct nfs42_layoutstat_devinfo, ld_private); 2249 __be32 *start; 2250 2251 /* layoutupdate length */ 2252 start = xdr_reserve_space(xdr, 4); 2253 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2254 2255 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2256 } 2257 2258 static void 2259 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2260 { 2261 struct nfs4_ff_layout_mirror *mirror = opaque->data; 2262 2263 ff_layout_put_mirror(mirror); 2264 } 2265 2266 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2267 .encode = ff_layout_encode_layoutstats, 2268 .free = ff_layout_free_layoutstats, 2269 }; 2270 2271 static int 2272 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2273 struct nfs42_layoutstat_devinfo *devinfo, 2274 int dev_limit) 2275 { 2276 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2277 struct nfs4_ff_layout_mirror *mirror; 2278 struct nfs4_deviceid_node *dev; 2279 int i = 0; 2280 2281 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2282 if (i >= dev_limit) 2283 break; 2284 if (IS_ERR_OR_NULL(mirror->mirror_ds)) 2285 continue; 2286 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags)) 2287 continue; 2288 /* mirror refcount put in cleanup_layoutstats */ 2289 if (!refcount_inc_not_zero(&mirror->ref)) 2290 continue; 2291 dev = &mirror->mirror_ds->id_node; 2292 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE); 2293 devinfo->offset = 0; 2294 devinfo->length = NFS4_MAX_UINT64; 2295 spin_lock(&mirror->lock); 2296 devinfo->read_count = mirror->read_stat.io_stat.ops_completed; 2297 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed; 2298 devinfo->write_count = mirror->write_stat.io_stat.ops_completed; 2299 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed; 2300 spin_unlock(&mirror->lock); 2301 devinfo->layout_type = LAYOUT_FLEX_FILES; 2302 devinfo->ld_private.ops = &layoutstat_ops; 2303 devinfo->ld_private.data = mirror; 2304 2305 devinfo++; 2306 i++; 2307 } 2308 return i; 2309 } 2310 2311 static int 2312 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2313 { 2314 struct nfs4_flexfile_layout *ff_layout; 2315 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2316 2317 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2318 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO); 2319 if (!args->devinfo) 2320 return -ENOMEM; 2321 2322 spin_lock(&args->inode->i_lock); 2323 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout); 2324 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2325 &args->devinfo[0], dev_count); 2326 spin_unlock(&args->inode->i_lock); 2327 if (!args->num_dev) { 2328 kfree(args->devinfo); 2329 args->devinfo = NULL; 2330 return -ENOENT; 2331 } 2332 2333 return 0; 2334 } 2335 2336 static int 2337 ff_layout_set_layoutdriver(struct nfs_server *server, 2338 const struct nfs_fh *dummy) 2339 { 2340 #if IS_ENABLED(CONFIG_NFS_V4_2) 2341 server->caps |= NFS_CAP_LAYOUTSTATS; 2342 #endif 2343 return 0; 2344 } 2345 2346 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2347 .id = LAYOUT_FLEX_FILES, 2348 .name = "LAYOUT_FLEX_FILES", 2349 .owner = THIS_MODULE, 2350 .set_layoutdriver = ff_layout_set_layoutdriver, 2351 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2352 .free_layout_hdr = ff_layout_free_layout_hdr, 2353 .alloc_lseg = ff_layout_alloc_lseg, 2354 .free_lseg = ff_layout_free_lseg, 2355 .add_lseg = ff_layout_add_lseg, 2356 .pg_read_ops = &ff_layout_pg_read_ops, 2357 .pg_write_ops = &ff_layout_pg_write_ops, 2358 .get_ds_info = ff_layout_get_ds_info, 2359 .free_deviceid_node = ff_layout_free_deviceid_node, 2360 .mark_request_commit = pnfs_layout_mark_request_commit, 2361 .clear_request_commit = pnfs_generic_clear_request_commit, 2362 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2363 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2364 .commit_pagelist = ff_layout_commit_pagelist, 2365 .read_pagelist = ff_layout_read_pagelist, 2366 .write_pagelist = ff_layout_write_pagelist, 2367 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 2368 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 2369 .sync = pnfs_nfs_generic_sync, 2370 .prepare_layoutstats = ff_layout_prepare_layoutstats, 2371 }; 2372 2373 static int __init nfs4flexfilelayout_init(void) 2374 { 2375 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 2376 __func__); 2377 if (!ff_zero_group) { 2378 ff_zero_group = groups_alloc(0); 2379 if (!ff_zero_group) 2380 return -ENOMEM; 2381 } 2382 return pnfs_register_layoutdriver(&flexfilelayout_type); 2383 } 2384 2385 static void __exit nfs4flexfilelayout_exit(void) 2386 { 2387 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 2388 __func__); 2389 pnfs_unregister_layoutdriver(&flexfilelayout_type); 2390 if (ff_zero_group) { 2391 put_group_info(ff_zero_group); 2392 ff_zero_group = NULL; 2393 } 2394 } 2395 2396 MODULE_ALIAS("nfs-layouttype4-4"); 2397 2398 MODULE_LICENSE("GPL"); 2399 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 2400 2401 module_init(nfs4flexfilelayout_init); 2402 module_exit(nfs4flexfilelayout_exit); 2403