1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Module for pnfs flexfile layout driver. 4 * 5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved. 6 * 7 * Tao Peng <bergwolf@primarydata.com> 8 */ 9 10 #include <linux/nfs_fs.h> 11 #include <linux/nfs_mount.h> 12 #include <linux/nfs_page.h> 13 #include <linux/module.h> 14 #include <linux/sched/mm.h> 15 16 #include <linux/sunrpc/metrics.h> 17 18 #include "flexfilelayout.h" 19 #include "../nfs4session.h" 20 #include "../nfs4idmap.h" 21 #include "../internal.h" 22 #include "../delegation.h" 23 #include "../nfs4trace.h" 24 #include "../iostat.h" 25 #include "../nfs.h" 26 #include "../nfs42.h" 27 28 #define NFSDBG_FACILITY NFSDBG_PNFS_LD 29 30 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ) 31 #define FF_LAYOUTRETURN_MAXERR 20 32 33 static unsigned short io_maxretrans; 34 35 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 36 struct nfs_pgio_header *hdr); 37 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 38 struct nfs42_layoutstat_devinfo *devinfo, 39 int dev_limit); 40 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 41 const struct nfs42_layoutstat_devinfo *devinfo, 42 struct nfs4_ff_layout_mirror *mirror); 43 44 static struct pnfs_layout_hdr * 45 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 46 { 47 struct nfs4_flexfile_layout *ffl; 48 49 ffl = kzalloc(sizeof(*ffl), gfp_flags); 50 if (ffl) { 51 INIT_LIST_HEAD(&ffl->error_list); 52 INIT_LIST_HEAD(&ffl->mirrors); 53 ffl->last_report_time = ktime_get(); 54 return &ffl->generic_hdr; 55 } else 56 return NULL; 57 } 58 59 static void 60 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo) 61 { 62 struct nfs4_ff_layout_ds_err *err, *n; 63 64 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list, 65 list) { 66 list_del(&err->list); 67 kfree(err); 68 } 69 kfree(FF_LAYOUT_FROM_HDR(lo)); 70 } 71 72 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 73 { 74 __be32 *p; 75 76 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 77 if (unlikely(p == NULL)) 78 return -ENOBUFS; 79 stateid->type = NFS4_PNFS_DS_STATEID_TYPE; 80 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 81 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__, 82 p[0], p[1], p[2], p[3]); 83 return 0; 84 } 85 86 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid) 87 { 88 __be32 *p; 89 90 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE); 91 if (unlikely(!p)) 92 return -ENOBUFS; 93 memcpy(devid, p, NFS4_DEVICEID4_SIZE); 94 nfs4_print_deviceid(devid); 95 return 0; 96 } 97 98 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 99 { 100 __be32 *p; 101 102 p = xdr_inline_decode(xdr, 4); 103 if (unlikely(!p)) 104 return -ENOBUFS; 105 fh->size = be32_to_cpup(p++); 106 if (fh->size > sizeof(struct nfs_fh)) { 107 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n", 108 fh->size); 109 return -EOVERFLOW; 110 } 111 /* fh.data */ 112 p = xdr_inline_decode(xdr, fh->size); 113 if (unlikely(!p)) 114 return -ENOBUFS; 115 memcpy(&fh->data, p, fh->size); 116 dprintk("%s: fh len %d\n", __func__, fh->size); 117 118 return 0; 119 } 120 121 /* 122 * Currently only stringified uids and gids are accepted. 123 * I.e., kerberos is not supported to the DSes, so no pricipals. 124 * 125 * That means that one common function will suffice, but when 126 * principals are added, this should be split to accomodate 127 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid(). 128 */ 129 static int 130 decode_name(struct xdr_stream *xdr, u32 *id) 131 { 132 __be32 *p; 133 int len; 134 135 /* opaque_length(4)*/ 136 p = xdr_inline_decode(xdr, 4); 137 if (unlikely(!p)) 138 return -ENOBUFS; 139 len = be32_to_cpup(p++); 140 if (len < 0) 141 return -EINVAL; 142 143 dprintk("%s: len %u\n", __func__, len); 144 145 /* opaque body */ 146 p = xdr_inline_decode(xdr, len); 147 if (unlikely(!p)) 148 return -ENOBUFS; 149 150 if (!nfs_map_string_to_numeric((char *)p, len, id)) 151 return -EINVAL; 152 153 return 0; 154 } 155 156 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1, 157 const struct nfs4_ff_layout_mirror *m2) 158 { 159 int i, j; 160 161 if (m1->fh_versions_cnt != m2->fh_versions_cnt) 162 return false; 163 for (i = 0; i < m1->fh_versions_cnt; i++) { 164 bool found_fh = false; 165 for (j = 0; j < m2->fh_versions_cnt; j++) { 166 if (nfs_compare_fh(&m1->fh_versions[i], 167 &m2->fh_versions[j]) == 0) { 168 found_fh = true; 169 break; 170 } 171 } 172 if (!found_fh) 173 return false; 174 } 175 return true; 176 } 177 178 static struct nfs4_ff_layout_mirror * 179 ff_layout_add_mirror(struct pnfs_layout_hdr *lo, 180 struct nfs4_ff_layout_mirror *mirror) 181 { 182 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 183 struct nfs4_ff_layout_mirror *pos; 184 struct inode *inode = lo->plh_inode; 185 186 spin_lock(&inode->i_lock); 187 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) { 188 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0) 189 continue; 190 if (!ff_mirror_match_fh(mirror, pos)) 191 continue; 192 if (refcount_inc_not_zero(&pos->ref)) { 193 spin_unlock(&inode->i_lock); 194 return pos; 195 } 196 } 197 list_add(&mirror->mirrors, &ff_layout->mirrors); 198 mirror->layout = lo; 199 spin_unlock(&inode->i_lock); 200 return mirror; 201 } 202 203 static void 204 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror) 205 { 206 struct inode *inode; 207 if (mirror->layout == NULL) 208 return; 209 inode = mirror->layout->plh_inode; 210 spin_lock(&inode->i_lock); 211 list_del(&mirror->mirrors); 212 spin_unlock(&inode->i_lock); 213 mirror->layout = NULL; 214 } 215 216 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags) 217 { 218 struct nfs4_ff_layout_mirror *mirror; 219 220 mirror = kzalloc(sizeof(*mirror), gfp_flags); 221 if (mirror != NULL) { 222 spin_lock_init(&mirror->lock); 223 refcount_set(&mirror->ref, 1); 224 INIT_LIST_HEAD(&mirror->mirrors); 225 } 226 return mirror; 227 } 228 229 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror) 230 { 231 const struct cred *cred; 232 233 ff_layout_remove_mirror(mirror); 234 kfree(mirror->fh_versions); 235 cred = rcu_access_pointer(mirror->ro_cred); 236 put_cred(cred); 237 cred = rcu_access_pointer(mirror->rw_cred); 238 put_cred(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 cred *kcred; 417 const struct cred __rcu *cred; 418 kuid_t uid; 419 kgid_t gid; 420 u32 ds_count, fh_count, id; 421 int j; 422 423 rc = -EIO; 424 p = xdr_inline_decode(&stream, 4); 425 if (!p) 426 goto out_err_free; 427 ds_count = be32_to_cpup(p); 428 429 /* FIXME: allow for striping? */ 430 if (ds_count != 1) 431 goto out_err_free; 432 433 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags); 434 if (fls->mirror_array[i] == NULL) { 435 rc = -ENOMEM; 436 goto out_err_free; 437 } 438 439 fls->mirror_array[i]->ds_count = ds_count; 440 441 /* deviceid */ 442 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid); 443 if (rc) 444 goto out_err_free; 445 446 /* efficiency */ 447 rc = -EIO; 448 p = xdr_inline_decode(&stream, 4); 449 if (!p) 450 goto out_err_free; 451 fls->mirror_array[i]->efficiency = be32_to_cpup(p); 452 453 /* stateid */ 454 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid); 455 if (rc) 456 goto out_err_free; 457 458 /* fh */ 459 rc = -EIO; 460 p = xdr_inline_decode(&stream, 4); 461 if (!p) 462 goto out_err_free; 463 fh_count = be32_to_cpup(p); 464 465 fls->mirror_array[i]->fh_versions = 466 kcalloc(fh_count, sizeof(struct nfs_fh), 467 gfp_flags); 468 if (fls->mirror_array[i]->fh_versions == NULL) { 469 rc = -ENOMEM; 470 goto out_err_free; 471 } 472 473 for (j = 0; j < fh_count; j++) { 474 rc = decode_nfs_fh(&stream, 475 &fls->mirror_array[i]->fh_versions[j]); 476 if (rc) 477 goto out_err_free; 478 } 479 480 fls->mirror_array[i]->fh_versions_cnt = fh_count; 481 482 /* user */ 483 rc = decode_name(&stream, &id); 484 if (rc) 485 goto out_err_free; 486 487 uid = make_kuid(&init_user_ns, id); 488 489 /* group */ 490 rc = decode_name(&stream, &id); 491 if (rc) 492 goto out_err_free; 493 494 gid = make_kgid(&init_user_ns, id); 495 496 if (gfp_flags & __GFP_FS) 497 kcred = prepare_kernel_cred(NULL); 498 else { 499 unsigned int nofs_flags = memalloc_nofs_save(); 500 kcred = prepare_kernel_cred(NULL); 501 memalloc_nofs_restore(nofs_flags); 502 } 503 rc = -ENOMEM; 504 if (!kcred) 505 goto out_err_free; 506 kcred->fsuid = uid; 507 kcred->fsgid = gid; 508 cred = RCU_INITIALIZER(kcred); 509 510 if (lgr->range.iomode == IOMODE_READ) 511 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 512 else 513 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 514 515 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]); 516 if (mirror != fls->mirror_array[i]) { 517 /* swap cred ptrs so free_mirror will clean up old */ 518 if (lgr->range.iomode == IOMODE_READ) { 519 cred = xchg(&mirror->ro_cred, cred); 520 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 521 } else { 522 cred = xchg(&mirror->rw_cred, cred); 523 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 524 } 525 ff_layout_free_mirror(fls->mirror_array[i]); 526 fls->mirror_array[i] = mirror; 527 } 528 529 dprintk("%s: iomode %s uid %u gid %u\n", __func__, 530 lgr->range.iomode == IOMODE_READ ? "READ" : "RW", 531 from_kuid(&init_user_ns, uid), 532 from_kgid(&init_user_ns, gid)); 533 } 534 535 p = xdr_inline_decode(&stream, 4); 536 if (!p) 537 goto out_sort_mirrors; 538 fls->flags = be32_to_cpup(p); 539 540 p = xdr_inline_decode(&stream, 4); 541 if (!p) 542 goto out_sort_mirrors; 543 for (i=0; i < fls->mirror_array_cnt; i++) 544 fls->mirror_array[i]->report_interval = be32_to_cpup(p); 545 546 out_sort_mirrors: 547 ff_layout_sort_mirrors(fls); 548 rc = ff_layout_check_layout(lgr); 549 if (rc) 550 goto out_err_free; 551 ret = &fls->generic_hdr; 552 dprintk("<-- %s (success)\n", __func__); 553 out_free_page: 554 __free_page(scratch); 555 return ret; 556 out_err_free: 557 _ff_layout_free_lseg(fls); 558 ret = ERR_PTR(rc); 559 dprintk("<-- %s (%d)\n", __func__, rc); 560 goto out_free_page; 561 } 562 563 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout) 564 { 565 struct pnfs_layout_segment *lseg; 566 567 list_for_each_entry(lseg, &layout->plh_segs, pls_list) 568 if (lseg->pls_range.iomode == IOMODE_RW) 569 return true; 570 571 return false; 572 } 573 574 static void 575 ff_layout_free_lseg(struct pnfs_layout_segment *lseg) 576 { 577 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 578 579 dprintk("--> %s\n", __func__); 580 581 if (lseg->pls_range.iomode == IOMODE_RW) { 582 struct nfs4_flexfile_layout *ffl; 583 struct inode *inode; 584 585 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout); 586 inode = ffl->generic_hdr.plh_inode; 587 spin_lock(&inode->i_lock); 588 if (!ff_layout_has_rw_segments(lseg->pls_layout)) { 589 ffl->commit_info.nbuckets = 0; 590 kfree(ffl->commit_info.buckets); 591 ffl->commit_info.buckets = NULL; 592 } 593 spin_unlock(&inode->i_lock); 594 } 595 _ff_layout_free_lseg(fls); 596 } 597 598 /* Return 1 until we have multiple lsegs support */ 599 static int 600 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls) 601 { 602 return 1; 603 } 604 605 static void 606 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 607 { 608 /* first IO request? */ 609 if (atomic_inc_return(&timer->n_ops) == 1) { 610 timer->start_time = now; 611 } 612 } 613 614 static ktime_t 615 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 616 { 617 ktime_t start; 618 619 if (atomic_dec_return(&timer->n_ops) < 0) 620 WARN_ON_ONCE(1); 621 622 start = timer->start_time; 623 timer->start_time = now; 624 return ktime_sub(now, start); 625 } 626 627 static bool 628 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 629 struct nfs4_ff_layoutstat *layoutstat, 630 ktime_t now) 631 { 632 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL; 633 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout); 634 635 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now); 636 if (!mirror->start_time) 637 mirror->start_time = now; 638 if (mirror->report_interval != 0) 639 report_interval = (s64)mirror->report_interval * 1000LL; 640 else if (layoutstats_timer != 0) 641 report_interval = (s64)layoutstats_timer * 1000LL; 642 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >= 643 report_interval) { 644 ffl->last_report_time = now; 645 return true; 646 } 647 648 return false; 649 } 650 651 static void 652 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat, 653 __u64 requested) 654 { 655 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 656 657 iostat->ops_requested++; 658 iostat->bytes_requested += requested; 659 } 660 661 static void 662 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat, 663 __u64 requested, 664 __u64 completed, 665 ktime_t time_completed, 666 ktime_t time_started) 667 { 668 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 669 ktime_t completion_time = ktime_sub(time_completed, time_started); 670 ktime_t timer; 671 672 iostat->ops_completed++; 673 iostat->bytes_completed += completed; 674 iostat->bytes_not_delivered += requested - completed; 675 676 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed); 677 iostat->total_busy_time = 678 ktime_add(iostat->total_busy_time, timer); 679 iostat->aggregate_completion_time = 680 ktime_add(iostat->aggregate_completion_time, 681 completion_time); 682 } 683 684 static void 685 nfs4_ff_layout_stat_io_start_read(struct inode *inode, 686 struct nfs4_ff_layout_mirror *mirror, 687 __u64 requested, ktime_t now) 688 { 689 bool report; 690 691 spin_lock(&mirror->lock); 692 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now); 693 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested); 694 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 695 spin_unlock(&mirror->lock); 696 697 if (report) 698 pnfs_report_layoutstat(inode, GFP_KERNEL); 699 } 700 701 static void 702 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task, 703 struct nfs4_ff_layout_mirror *mirror, 704 __u64 requested, 705 __u64 completed) 706 { 707 spin_lock(&mirror->lock); 708 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat, 709 requested, completed, 710 ktime_get(), task->tk_start); 711 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 712 spin_unlock(&mirror->lock); 713 } 714 715 static void 716 nfs4_ff_layout_stat_io_start_write(struct inode *inode, 717 struct nfs4_ff_layout_mirror *mirror, 718 __u64 requested, ktime_t now) 719 { 720 bool report; 721 722 spin_lock(&mirror->lock); 723 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now); 724 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested); 725 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 726 spin_unlock(&mirror->lock); 727 728 if (report) 729 pnfs_report_layoutstat(inode, GFP_NOIO); 730 } 731 732 static void 733 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, 734 struct nfs4_ff_layout_mirror *mirror, 735 __u64 requested, 736 __u64 completed, 737 enum nfs3_stable_how committed) 738 { 739 if (committed == NFS_UNSTABLE) 740 requested = completed = 0; 741 742 spin_lock(&mirror->lock); 743 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat, 744 requested, completed, ktime_get(), task->tk_start); 745 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 746 spin_unlock(&mirror->lock); 747 } 748 749 static int 750 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg, 751 struct nfs_commit_info *cinfo, 752 gfp_t gfp_flags) 753 { 754 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 755 struct pnfs_commit_bucket *buckets; 756 int size; 757 758 if (cinfo->ds->nbuckets != 0) { 759 /* This assumes there is only one RW lseg per file. 760 * To support multiple lseg per file, we need to 761 * change struct pnfs_commit_bucket to allow dynamic 762 * increasing nbuckets. 763 */ 764 return 0; 765 } 766 767 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg); 768 769 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket), 770 gfp_flags); 771 if (!buckets) 772 return -ENOMEM; 773 else { 774 int i; 775 776 spin_lock(&cinfo->inode->i_lock); 777 if (cinfo->ds->nbuckets != 0) 778 kfree(buckets); 779 else { 780 cinfo->ds->buckets = buckets; 781 cinfo->ds->nbuckets = size; 782 for (i = 0; i < size; i++) { 783 INIT_LIST_HEAD(&buckets[i].written); 784 INIT_LIST_HEAD(&buckets[i].committing); 785 /* mark direct verifier as unset */ 786 buckets[i].direct_verf.committed = 787 NFS_INVALID_STABLE_HOW; 788 } 789 } 790 spin_unlock(&cinfo->inode->i_lock); 791 return 0; 792 } 793 } 794 795 static void 796 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx) 797 { 798 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 799 800 if (devid) 801 nfs4_mark_deviceid_unavailable(devid); 802 } 803 804 static void 805 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx) 806 { 807 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 808 809 if (devid) 810 nfs4_mark_deviceid_available(devid); 811 } 812 813 static struct nfs4_pnfs_ds * 814 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, 815 int start_idx, int *best_idx, 816 bool check_device) 817 { 818 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 819 struct nfs4_ff_layout_mirror *mirror; 820 struct nfs4_pnfs_ds *ds; 821 bool fail_return = false; 822 int idx; 823 824 /* mirrors are initially sorted by efficiency */ 825 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 826 if (idx+1 == fls->mirror_array_cnt) 827 fail_return = !check_device; 828 829 mirror = FF_LAYOUT_COMP(lseg, idx); 830 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return); 831 if (!ds) 832 continue; 833 834 if (check_device && 835 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node)) 836 continue; 837 838 *best_idx = idx; 839 return ds; 840 } 841 842 return NULL; 843 } 844 845 static struct nfs4_pnfs_ds * 846 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg, 847 int start_idx, int *best_idx) 848 { 849 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false); 850 } 851 852 static struct nfs4_pnfs_ds * 853 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg, 854 int start_idx, int *best_idx) 855 { 856 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true); 857 } 858 859 static struct nfs4_pnfs_ds * 860 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 861 int start_idx, int *best_idx) 862 { 863 struct nfs4_pnfs_ds *ds; 864 865 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx); 866 if (ds) 867 return ds; 868 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx); 869 } 870 871 static void 872 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio, 873 struct nfs_page *req, 874 bool strict_iomode) 875 { 876 pnfs_put_lseg(pgio->pg_lseg); 877 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 878 nfs_req_openctx(req), 879 0, 880 NFS4_MAX_UINT64, 881 IOMODE_READ, 882 strict_iomode, 883 GFP_KERNEL); 884 if (IS_ERR(pgio->pg_lseg)) { 885 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 886 pgio->pg_lseg = NULL; 887 } 888 } 889 890 static void 891 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 892 struct nfs_page *req) 893 { 894 struct nfs_pgio_mirror *pgm; 895 struct nfs4_ff_layout_mirror *mirror; 896 struct nfs4_pnfs_ds *ds; 897 int ds_idx; 898 899 retry: 900 pnfs_generic_pg_check_layout(pgio); 901 /* Use full layout for now */ 902 if (!pgio->pg_lseg) { 903 ff_layout_pg_get_read(pgio, req, false); 904 if (!pgio->pg_lseg) 905 goto out_nolseg; 906 } 907 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 908 ff_layout_pg_get_read(pgio, req, true); 909 if (!pgio->pg_lseg) 910 goto out_nolseg; 911 } 912 913 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx); 914 if (!ds) { 915 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 916 goto out_mds; 917 pnfs_put_lseg(pgio->pg_lseg); 918 pgio->pg_lseg = NULL; 919 /* Sleep for 1 second before retrying */ 920 ssleep(1); 921 goto retry; 922 } 923 924 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 925 926 pgio->pg_mirror_idx = ds_idx; 927 928 /* read always uses only one mirror - idx 0 for pgio layer */ 929 pgm = &pgio->pg_mirrors[0]; 930 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; 931 932 if (NFS_SERVER(pgio->pg_inode)->flags & 933 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 934 pgio->pg_maxretrans = io_maxretrans; 935 return; 936 out_nolseg: 937 if (pgio->pg_error < 0) 938 return; 939 out_mds: 940 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode, 941 0, NFS4_MAX_UINT64, IOMODE_READ, 942 NFS_I(pgio->pg_inode)->layout, 943 pgio->pg_lseg); 944 pnfs_put_lseg(pgio->pg_lseg); 945 pgio->pg_lseg = NULL; 946 pgio->pg_maxretrans = 0; 947 nfs_pageio_reset_read_mds(pgio); 948 } 949 950 static void 951 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 952 struct nfs_page *req) 953 { 954 struct nfs4_ff_layout_mirror *mirror; 955 struct nfs_pgio_mirror *pgm; 956 struct nfs_commit_info cinfo; 957 struct nfs4_pnfs_ds *ds; 958 int i; 959 int status; 960 961 retry: 962 pnfs_generic_pg_check_layout(pgio); 963 if (!pgio->pg_lseg) { 964 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 965 nfs_req_openctx(req), 966 0, 967 NFS4_MAX_UINT64, 968 IOMODE_RW, 969 false, 970 GFP_NOFS); 971 if (IS_ERR(pgio->pg_lseg)) { 972 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 973 pgio->pg_lseg = NULL; 974 return; 975 } 976 } 977 /* If no lseg, fall back to write through mds */ 978 if (pgio->pg_lseg == NULL) 979 goto out_mds; 980 981 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq); 982 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS); 983 if (status < 0) 984 goto out_mds; 985 986 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 987 if (WARN_ON_ONCE(pgio->pg_mirror_count != 988 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))) 989 goto out_mds; 990 991 for (i = 0; i < pgio->pg_mirror_count; i++) { 992 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 993 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true); 994 if (!ds) { 995 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 996 goto out_mds; 997 pnfs_put_lseg(pgio->pg_lseg); 998 pgio->pg_lseg = NULL; 999 /* Sleep for 1 second before retrying */ 1000 ssleep(1); 1001 goto retry; 1002 } 1003 pgm = &pgio->pg_mirrors[i]; 1004 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize; 1005 } 1006 1007 if (NFS_SERVER(pgio->pg_inode)->flags & 1008 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 1009 pgio->pg_maxretrans = io_maxretrans; 1010 return; 1011 1012 out_mds: 1013 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode, 1014 0, NFS4_MAX_UINT64, IOMODE_RW, 1015 NFS_I(pgio->pg_inode)->layout, 1016 pgio->pg_lseg); 1017 pnfs_put_lseg(pgio->pg_lseg); 1018 pgio->pg_lseg = NULL; 1019 pgio->pg_maxretrans = 0; 1020 nfs_pageio_reset_write_mds(pgio); 1021 } 1022 1023 static unsigned int 1024 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 1025 struct nfs_page *req) 1026 { 1027 if (!pgio->pg_lseg) { 1028 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 1029 nfs_req_openctx(req), 1030 0, 1031 NFS4_MAX_UINT64, 1032 IOMODE_RW, 1033 false, 1034 GFP_NOFS); 1035 if (IS_ERR(pgio->pg_lseg)) { 1036 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 1037 pgio->pg_lseg = NULL; 1038 goto out; 1039 } 1040 } 1041 if (pgio->pg_lseg) 1042 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 1043 1044 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode, 1045 0, NFS4_MAX_UINT64, IOMODE_RW, 1046 NFS_I(pgio->pg_inode)->layout, 1047 pgio->pg_lseg); 1048 /* no lseg means that pnfs is not in use, so no mirroring here */ 1049 nfs_pageio_reset_write_mds(pgio); 1050 out: 1051 return 1; 1052 } 1053 1054 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 1055 .pg_init = ff_layout_pg_init_read, 1056 .pg_test = pnfs_generic_pg_test, 1057 .pg_doio = pnfs_generic_pg_readpages, 1058 .pg_cleanup = pnfs_generic_pg_cleanup, 1059 }; 1060 1061 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 1062 .pg_init = ff_layout_pg_init_write, 1063 .pg_test = pnfs_generic_pg_test, 1064 .pg_doio = pnfs_generic_pg_writepages, 1065 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 1066 .pg_cleanup = pnfs_generic_pg_cleanup, 1067 }; 1068 1069 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 1070 { 1071 struct rpc_task *task = &hdr->task; 1072 1073 pnfs_layoutcommit_inode(hdr->inode, false); 1074 1075 if (retry_pnfs) { 1076 dprintk("%s Reset task %5u for i/o through pNFS " 1077 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1078 hdr->task.tk_pid, 1079 hdr->inode->i_sb->s_id, 1080 (unsigned long long)NFS_FILEID(hdr->inode), 1081 hdr->args.count, 1082 (unsigned long long)hdr->args.offset); 1083 1084 hdr->completion_ops->reschedule_io(hdr); 1085 return; 1086 } 1087 1088 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1089 dprintk("%s Reset task %5u for i/o through MDS " 1090 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1091 hdr->task.tk_pid, 1092 hdr->inode->i_sb->s_id, 1093 (unsigned long long)NFS_FILEID(hdr->inode), 1094 hdr->args.count, 1095 (unsigned long long)hdr->args.offset); 1096 1097 trace_pnfs_mds_fallback_write_done(hdr->inode, 1098 hdr->args.offset, hdr->args.count, 1099 IOMODE_RW, NFS_I(hdr->inode)->layout, 1100 hdr->lseg); 1101 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1102 } 1103 } 1104 1105 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1106 { 1107 struct rpc_task *task = &hdr->task; 1108 1109 pnfs_layoutcommit_inode(hdr->inode, false); 1110 1111 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1112 dprintk("%s Reset task %5u for i/o through MDS " 1113 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1114 hdr->task.tk_pid, 1115 hdr->inode->i_sb->s_id, 1116 (unsigned long long)NFS_FILEID(hdr->inode), 1117 hdr->args.count, 1118 (unsigned long long)hdr->args.offset); 1119 1120 trace_pnfs_mds_fallback_read_done(hdr->inode, 1121 hdr->args.offset, hdr->args.count, 1122 IOMODE_READ, NFS_I(hdr->inode)->layout, 1123 hdr->lseg); 1124 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1125 } 1126 } 1127 1128 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1129 struct nfs4_state *state, 1130 struct nfs_client *clp, 1131 struct pnfs_layout_segment *lseg, 1132 int idx) 1133 { 1134 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1135 struct inode *inode = lo->plh_inode; 1136 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1137 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1138 1139 switch (task->tk_status) { 1140 case -NFS4ERR_BADSESSION: 1141 case -NFS4ERR_BADSLOT: 1142 case -NFS4ERR_BAD_HIGH_SLOT: 1143 case -NFS4ERR_DEADSESSION: 1144 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1145 case -NFS4ERR_SEQ_FALSE_RETRY: 1146 case -NFS4ERR_SEQ_MISORDERED: 1147 dprintk("%s ERROR %d, Reset session. Exchangeid " 1148 "flags 0x%x\n", __func__, task->tk_status, 1149 clp->cl_exchange_flags); 1150 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1151 break; 1152 case -NFS4ERR_DELAY: 1153 case -NFS4ERR_GRACE: 1154 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1155 break; 1156 case -NFS4ERR_RETRY_UNCACHED_REP: 1157 break; 1158 /* Invalidate Layout errors */ 1159 case -NFS4ERR_PNFS_NO_LAYOUT: 1160 case -ESTALE: /* mapped NFS4ERR_STALE */ 1161 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 1162 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 1163 case -NFS4ERR_FHEXPIRED: 1164 case -NFS4ERR_WRONG_TYPE: 1165 dprintk("%s Invalid layout error %d\n", __func__, 1166 task->tk_status); 1167 /* 1168 * Destroy layout so new i/o will get a new layout. 1169 * Layout will not be destroyed until all current lseg 1170 * references are put. Mark layout as invalid to resend failed 1171 * i/o and all i/o waiting on the slot table to the MDS until 1172 * layout is destroyed and a new valid layout is obtained. 1173 */ 1174 pnfs_destroy_layout(NFS_I(inode)); 1175 rpc_wake_up(&tbl->slot_tbl_waitq); 1176 goto reset; 1177 /* RPC connection errors */ 1178 case -ECONNREFUSED: 1179 case -EHOSTDOWN: 1180 case -EHOSTUNREACH: 1181 case -ENETUNREACH: 1182 case -EIO: 1183 case -ETIMEDOUT: 1184 case -EPIPE: 1185 dprintk("%s DS connection error %d\n", __func__, 1186 task->tk_status); 1187 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1188 &devid->deviceid); 1189 rpc_wake_up(&tbl->slot_tbl_waitq); 1190 /* fall through */ 1191 default: 1192 if (ff_layout_avoid_mds_available_ds(lseg)) 1193 return -NFS4ERR_RESET_TO_PNFS; 1194 reset: 1195 dprintk("%s Retry through MDS. Error %d\n", __func__, 1196 task->tk_status); 1197 return -NFS4ERR_RESET_TO_MDS; 1198 } 1199 task->tk_status = 0; 1200 return -EAGAIN; 1201 } 1202 1203 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1204 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1205 struct pnfs_layout_segment *lseg, 1206 int idx) 1207 { 1208 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1209 1210 switch (task->tk_status) { 1211 /* File access problems. Don't mark the device as unavailable */ 1212 case -EACCES: 1213 case -ESTALE: 1214 case -EISDIR: 1215 case -EBADHANDLE: 1216 case -ELOOP: 1217 case -ENOSPC: 1218 break; 1219 case -EJUKEBOX: 1220 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1221 goto out_retry; 1222 default: 1223 dprintk("%s DS connection error %d\n", __func__, 1224 task->tk_status); 1225 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1226 &devid->deviceid); 1227 } 1228 /* FIXME: Need to prevent infinite looping here. */ 1229 return -NFS4ERR_RESET_TO_PNFS; 1230 out_retry: 1231 task->tk_status = 0; 1232 rpc_restart_call_prepare(task); 1233 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1234 return -EAGAIN; 1235 } 1236 1237 static int ff_layout_async_handle_error(struct rpc_task *task, 1238 struct nfs4_state *state, 1239 struct nfs_client *clp, 1240 struct pnfs_layout_segment *lseg, 1241 int idx) 1242 { 1243 int vers = clp->cl_nfs_mod->rpc_vers->number; 1244 1245 if (task->tk_status >= 0) { 1246 ff_layout_mark_ds_reachable(lseg, idx); 1247 return 0; 1248 } 1249 1250 /* Handle the case of an invalid layout segment */ 1251 if (!pnfs_is_valid_lseg(lseg)) 1252 return -NFS4ERR_RESET_TO_PNFS; 1253 1254 switch (vers) { 1255 case 3: 1256 return ff_layout_async_handle_error_v3(task, lseg, idx); 1257 case 4: 1258 return ff_layout_async_handle_error_v4(task, state, clp, 1259 lseg, idx); 1260 default: 1261 /* should never happen */ 1262 WARN_ON_ONCE(1); 1263 return 0; 1264 } 1265 } 1266 1267 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1268 int idx, u64 offset, u64 length, 1269 u32 status, int opnum, int error) 1270 { 1271 struct nfs4_ff_layout_mirror *mirror; 1272 int err; 1273 1274 if (status == 0) { 1275 switch (error) { 1276 case -ETIMEDOUT: 1277 case -EPFNOSUPPORT: 1278 case -EPROTONOSUPPORT: 1279 case -EOPNOTSUPP: 1280 case -ECONNREFUSED: 1281 case -ECONNRESET: 1282 case -EHOSTDOWN: 1283 case -EHOSTUNREACH: 1284 case -ENETUNREACH: 1285 case -EADDRINUSE: 1286 case -ENOBUFS: 1287 case -EPIPE: 1288 case -EPERM: 1289 status = NFS4ERR_NXIO; 1290 break; 1291 case -EACCES: 1292 status = NFS4ERR_ACCESS; 1293 break; 1294 default: 1295 return; 1296 } 1297 } 1298 1299 switch (status) { 1300 case NFS4ERR_DELAY: 1301 case NFS4ERR_GRACE: 1302 return; 1303 default: 1304 break; 1305 } 1306 1307 mirror = FF_LAYOUT_COMP(lseg, idx); 1308 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1309 mirror, offset, length, status, opnum, 1310 GFP_NOIO); 1311 if (status == NFS4ERR_NXIO) 1312 ff_layout_mark_ds_unreachable(lseg, idx); 1313 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg); 1314 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1315 } 1316 1317 /* NFS_PROTO call done callback routines */ 1318 static int ff_layout_read_done_cb(struct rpc_task *task, 1319 struct nfs_pgio_header *hdr) 1320 { 1321 int new_idx = hdr->pgio_mirror_idx; 1322 int err; 1323 1324 trace_nfs4_pnfs_read(hdr, task->tk_status); 1325 if (task->tk_status < 0) 1326 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1327 hdr->args.offset, hdr->args.count, 1328 hdr->res.op_status, OP_READ, 1329 task->tk_status); 1330 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1331 hdr->ds_clp, hdr->lseg, 1332 hdr->pgio_mirror_idx); 1333 1334 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1335 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1336 switch (err) { 1337 case -NFS4ERR_RESET_TO_PNFS: 1338 if (ff_layout_choose_best_ds_for_read(hdr->lseg, 1339 hdr->pgio_mirror_idx + 1, 1340 &new_idx)) 1341 goto out_layouterror; 1342 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1343 return task->tk_status; 1344 case -NFS4ERR_RESET_TO_MDS: 1345 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1346 return task->tk_status; 1347 case -EAGAIN: 1348 goto out_eagain; 1349 } 1350 1351 return 0; 1352 out_layouterror: 1353 ff_layout_read_record_layoutstats_done(task, hdr); 1354 ff_layout_send_layouterror(hdr->lseg); 1355 hdr->pgio_mirror_idx = new_idx; 1356 out_eagain: 1357 rpc_restart_call_prepare(task); 1358 return -EAGAIN; 1359 } 1360 1361 static bool 1362 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1363 { 1364 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1365 } 1366 1367 /* 1368 * We reference the rpc_cred of the first WRITE that triggers the need for 1369 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1370 * rfc5661 is not clear about which credential should be used. 1371 * 1372 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1373 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1374 * we always send layoutcommit after DS writes. 1375 */ 1376 static void 1377 ff_layout_set_layoutcommit(struct inode *inode, 1378 struct pnfs_layout_segment *lseg, 1379 loff_t end_offset) 1380 { 1381 if (!ff_layout_need_layoutcommit(lseg)) 1382 return; 1383 1384 pnfs_set_layoutcommit(inode, lseg, end_offset); 1385 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1386 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1387 } 1388 1389 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1390 struct nfs_pgio_header *hdr) 1391 { 1392 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1393 return; 1394 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1395 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1396 hdr->args.count, 1397 task->tk_start); 1398 } 1399 1400 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1401 struct nfs_pgio_header *hdr) 1402 { 1403 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1404 return; 1405 nfs4_ff_layout_stat_io_end_read(task, 1406 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1407 hdr->args.count, 1408 hdr->res.count); 1409 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1410 } 1411 1412 static int ff_layout_read_prepare_common(struct rpc_task *task, 1413 struct nfs_pgio_header *hdr) 1414 { 1415 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1416 rpc_exit(task, -EIO); 1417 return -EIO; 1418 } 1419 1420 ff_layout_read_record_layoutstats_start(task, hdr); 1421 return 0; 1422 } 1423 1424 /* 1425 * Call ops for the async read/write cases 1426 * In the case of dense layouts, the offset needs to be reset to its 1427 * original value. 1428 */ 1429 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1430 { 1431 struct nfs_pgio_header *hdr = data; 1432 1433 if (ff_layout_read_prepare_common(task, hdr)) 1434 return; 1435 1436 rpc_call_start(task); 1437 } 1438 1439 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1440 { 1441 struct nfs_pgio_header *hdr = data; 1442 1443 if (nfs4_setup_sequence(hdr->ds_clp, 1444 &hdr->args.seq_args, 1445 &hdr->res.seq_res, 1446 task)) 1447 return; 1448 1449 ff_layout_read_prepare_common(task, hdr); 1450 } 1451 1452 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1453 { 1454 struct nfs_pgio_header *hdr = data; 1455 1456 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 1457 1458 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1459 task->tk_status == 0) { 1460 nfs4_sequence_done(task, &hdr->res.seq_res); 1461 return; 1462 } 1463 1464 /* Note this may cause RPC to be resent */ 1465 hdr->mds_ops->rpc_call_done(task, hdr); 1466 } 1467 1468 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1469 { 1470 struct nfs_pgio_header *hdr = data; 1471 1472 ff_layout_read_record_layoutstats_done(task, hdr); 1473 rpc_count_iostats_metrics(task, 1474 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1475 } 1476 1477 static void ff_layout_read_release(void *data) 1478 { 1479 struct nfs_pgio_header *hdr = data; 1480 1481 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1482 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1483 ff_layout_send_layouterror(hdr->lseg); 1484 pnfs_read_resend_pnfs(hdr); 1485 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1486 ff_layout_reset_read(hdr); 1487 pnfs_generic_rw_release(data); 1488 } 1489 1490 1491 static int ff_layout_write_done_cb(struct rpc_task *task, 1492 struct nfs_pgio_header *hdr) 1493 { 1494 loff_t end_offs = 0; 1495 int err; 1496 1497 trace_nfs4_pnfs_write(hdr, task->tk_status); 1498 if (task->tk_status < 0) 1499 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1500 hdr->args.offset, hdr->args.count, 1501 hdr->res.op_status, OP_WRITE, 1502 task->tk_status); 1503 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1504 hdr->ds_clp, hdr->lseg, 1505 hdr->pgio_mirror_idx); 1506 1507 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1508 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1509 switch (err) { 1510 case -NFS4ERR_RESET_TO_PNFS: 1511 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1512 return task->tk_status; 1513 case -NFS4ERR_RESET_TO_MDS: 1514 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1515 return task->tk_status; 1516 case -EAGAIN: 1517 return -EAGAIN; 1518 } 1519 1520 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1521 hdr->res.verf->committed == NFS_DATA_SYNC) 1522 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1523 1524 /* Note: if the write is unstable, don't set end_offs until commit */ 1525 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1526 1527 /* zero out fattr since we don't care DS attr at all */ 1528 hdr->fattr.valid = 0; 1529 if (task->tk_status >= 0) 1530 nfs_writeback_update_inode(hdr); 1531 1532 return 0; 1533 } 1534 1535 static int ff_layout_commit_done_cb(struct rpc_task *task, 1536 struct nfs_commit_data *data) 1537 { 1538 int err; 1539 1540 trace_nfs4_pnfs_commit_ds(data, task->tk_status); 1541 if (task->tk_status < 0) 1542 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index, 1543 data->args.offset, data->args.count, 1544 data->res.op_status, OP_COMMIT, 1545 task->tk_status); 1546 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1547 data->lseg, data->ds_commit_index); 1548 1549 switch (err) { 1550 case -NFS4ERR_RESET_TO_PNFS: 1551 pnfs_generic_prepare_to_resend_writes(data); 1552 return -EAGAIN; 1553 case -NFS4ERR_RESET_TO_MDS: 1554 pnfs_generic_prepare_to_resend_writes(data); 1555 return -EAGAIN; 1556 case -EAGAIN: 1557 rpc_restart_call_prepare(task); 1558 return -EAGAIN; 1559 } 1560 1561 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1562 1563 return 0; 1564 } 1565 1566 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1567 struct nfs_pgio_header *hdr) 1568 { 1569 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1570 return; 1571 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1572 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1573 hdr->args.count, 1574 task->tk_start); 1575 } 1576 1577 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1578 struct nfs_pgio_header *hdr) 1579 { 1580 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1581 return; 1582 nfs4_ff_layout_stat_io_end_write(task, 1583 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1584 hdr->args.count, hdr->res.count, 1585 hdr->res.verf->committed); 1586 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1587 } 1588 1589 static int ff_layout_write_prepare_common(struct rpc_task *task, 1590 struct nfs_pgio_header *hdr) 1591 { 1592 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1593 rpc_exit(task, -EIO); 1594 return -EIO; 1595 } 1596 1597 ff_layout_write_record_layoutstats_start(task, hdr); 1598 return 0; 1599 } 1600 1601 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1602 { 1603 struct nfs_pgio_header *hdr = data; 1604 1605 if (ff_layout_write_prepare_common(task, hdr)) 1606 return; 1607 1608 rpc_call_start(task); 1609 } 1610 1611 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1612 { 1613 struct nfs_pgio_header *hdr = data; 1614 1615 if (nfs4_setup_sequence(hdr->ds_clp, 1616 &hdr->args.seq_args, 1617 &hdr->res.seq_res, 1618 task)) 1619 return; 1620 1621 ff_layout_write_prepare_common(task, hdr); 1622 } 1623 1624 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1625 { 1626 struct nfs_pgio_header *hdr = data; 1627 1628 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1629 task->tk_status == 0) { 1630 nfs4_sequence_done(task, &hdr->res.seq_res); 1631 return; 1632 } 1633 1634 /* Note this may cause RPC to be resent */ 1635 hdr->mds_ops->rpc_call_done(task, hdr); 1636 } 1637 1638 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1639 { 1640 struct nfs_pgio_header *hdr = data; 1641 1642 ff_layout_write_record_layoutstats_done(task, hdr); 1643 rpc_count_iostats_metrics(task, 1644 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1645 } 1646 1647 static void ff_layout_write_release(void *data) 1648 { 1649 struct nfs_pgio_header *hdr = data; 1650 1651 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1652 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1653 ff_layout_send_layouterror(hdr->lseg); 1654 ff_layout_reset_write(hdr, true); 1655 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1656 ff_layout_reset_write(hdr, false); 1657 pnfs_generic_rw_release(data); 1658 } 1659 1660 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1661 struct nfs_commit_data *cdata) 1662 { 1663 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1664 return; 1665 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1666 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1667 0, task->tk_start); 1668 } 1669 1670 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1671 struct nfs_commit_data *cdata) 1672 { 1673 struct nfs_page *req; 1674 __u64 count = 0; 1675 1676 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1677 return; 1678 1679 if (task->tk_status == 0) { 1680 list_for_each_entry(req, &cdata->pages, wb_list) 1681 count += req->wb_bytes; 1682 } 1683 nfs4_ff_layout_stat_io_end_write(task, 1684 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1685 count, count, NFS_FILE_SYNC); 1686 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 1687 } 1688 1689 static void ff_layout_commit_prepare_common(struct rpc_task *task, 1690 struct nfs_commit_data *cdata) 1691 { 1692 ff_layout_commit_record_layoutstats_start(task, cdata); 1693 } 1694 1695 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1696 { 1697 ff_layout_commit_prepare_common(task, data); 1698 rpc_call_start(task); 1699 } 1700 1701 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1702 { 1703 struct nfs_commit_data *wdata = data; 1704 1705 if (nfs4_setup_sequence(wdata->ds_clp, 1706 &wdata->args.seq_args, 1707 &wdata->res.seq_res, 1708 task)) 1709 return; 1710 ff_layout_commit_prepare_common(task, data); 1711 } 1712 1713 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1714 { 1715 pnfs_generic_write_commit_done(task, data); 1716 } 1717 1718 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1719 { 1720 struct nfs_commit_data *cdata = data; 1721 1722 ff_layout_commit_record_layoutstats_done(task, cdata); 1723 rpc_count_iostats_metrics(task, 1724 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1725 } 1726 1727 static void ff_layout_commit_release(void *data) 1728 { 1729 struct nfs_commit_data *cdata = data; 1730 1731 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1732 pnfs_generic_commit_release(data); 1733 } 1734 1735 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1736 .rpc_call_prepare = ff_layout_read_prepare_v3, 1737 .rpc_call_done = ff_layout_read_call_done, 1738 .rpc_count_stats = ff_layout_read_count_stats, 1739 .rpc_release = ff_layout_read_release, 1740 }; 1741 1742 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 1743 .rpc_call_prepare = ff_layout_read_prepare_v4, 1744 .rpc_call_done = ff_layout_read_call_done, 1745 .rpc_count_stats = ff_layout_read_count_stats, 1746 .rpc_release = ff_layout_read_release, 1747 }; 1748 1749 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1750 .rpc_call_prepare = ff_layout_write_prepare_v3, 1751 .rpc_call_done = ff_layout_write_call_done, 1752 .rpc_count_stats = ff_layout_write_count_stats, 1753 .rpc_release = ff_layout_write_release, 1754 }; 1755 1756 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1757 .rpc_call_prepare = ff_layout_write_prepare_v4, 1758 .rpc_call_done = ff_layout_write_call_done, 1759 .rpc_count_stats = ff_layout_write_count_stats, 1760 .rpc_release = ff_layout_write_release, 1761 }; 1762 1763 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 1764 .rpc_call_prepare = ff_layout_commit_prepare_v3, 1765 .rpc_call_done = ff_layout_commit_done, 1766 .rpc_count_stats = ff_layout_commit_count_stats, 1767 .rpc_release = ff_layout_commit_release, 1768 }; 1769 1770 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 1771 .rpc_call_prepare = ff_layout_commit_prepare_v4, 1772 .rpc_call_done = ff_layout_commit_done, 1773 .rpc_count_stats = ff_layout_commit_count_stats, 1774 .rpc_release = ff_layout_commit_release, 1775 }; 1776 1777 static enum pnfs_try_status 1778 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 1779 { 1780 struct pnfs_layout_segment *lseg = hdr->lseg; 1781 struct nfs4_pnfs_ds *ds; 1782 struct rpc_clnt *ds_clnt; 1783 struct nfs4_ff_layout_mirror *mirror; 1784 const struct cred *ds_cred; 1785 loff_t offset = hdr->args.offset; 1786 u32 idx = hdr->pgio_mirror_idx; 1787 int vers; 1788 struct nfs_fh *fh; 1789 1790 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 1791 __func__, hdr->inode->i_ino, 1792 hdr->args.pgbase, (size_t)hdr->args.count, offset); 1793 1794 mirror = FF_LAYOUT_COMP(lseg, idx); 1795 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 1796 if (!ds) 1797 goto out_failed; 1798 1799 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1800 hdr->inode); 1801 if (IS_ERR(ds_clnt)) 1802 goto out_failed; 1803 1804 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1805 if (!ds_cred) 1806 goto out_failed; 1807 1808 vers = nfs4_ff_layout_ds_version(mirror); 1809 1810 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 1811 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 1812 1813 hdr->pgio_done_cb = ff_layout_read_done_cb; 1814 refcount_inc(&ds->ds_clp->cl_count); 1815 hdr->ds_clp = ds->ds_clp; 1816 fh = nfs4_ff_layout_select_ds_fh(mirror); 1817 if (fh) 1818 hdr->args.fh = fh; 1819 1820 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1821 1822 /* 1823 * Note that if we ever decide to split across DSes, 1824 * then we may need to handle dense-like offsets. 1825 */ 1826 hdr->args.offset = offset; 1827 hdr->mds_offset = offset; 1828 1829 /* Perform an asynchronous read to ds */ 1830 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1831 vers == 3 ? &ff_layout_read_call_ops_v3 : 1832 &ff_layout_read_call_ops_v4, 1833 0, RPC_TASK_SOFTCONN); 1834 put_cred(ds_cred); 1835 return PNFS_ATTEMPTED; 1836 1837 out_failed: 1838 if (ff_layout_avoid_mds_available_ds(lseg)) 1839 return PNFS_TRY_AGAIN; 1840 trace_pnfs_mds_fallback_read_pagelist(hdr->inode, 1841 hdr->args.offset, hdr->args.count, 1842 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg); 1843 return PNFS_NOT_ATTEMPTED; 1844 } 1845 1846 /* Perform async writes. */ 1847 static enum pnfs_try_status 1848 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 1849 { 1850 struct pnfs_layout_segment *lseg = hdr->lseg; 1851 struct nfs4_pnfs_ds *ds; 1852 struct rpc_clnt *ds_clnt; 1853 struct nfs4_ff_layout_mirror *mirror; 1854 const struct cred *ds_cred; 1855 loff_t offset = hdr->args.offset; 1856 int vers; 1857 struct nfs_fh *fh; 1858 int idx = hdr->pgio_mirror_idx; 1859 1860 mirror = FF_LAYOUT_COMP(lseg, idx); 1861 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1862 if (!ds) 1863 goto out_failed; 1864 1865 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1866 hdr->inode); 1867 if (IS_ERR(ds_clnt)) 1868 goto out_failed; 1869 1870 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1871 if (!ds_cred) 1872 goto out_failed; 1873 1874 vers = nfs4_ff_layout_ds_version(mirror); 1875 1876 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 1877 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 1878 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 1879 vers); 1880 1881 hdr->pgio_done_cb = ff_layout_write_done_cb; 1882 refcount_inc(&ds->ds_clp->cl_count); 1883 hdr->ds_clp = ds->ds_clp; 1884 hdr->ds_commit_idx = idx; 1885 fh = nfs4_ff_layout_select_ds_fh(mirror); 1886 if (fh) 1887 hdr->args.fh = fh; 1888 1889 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1890 1891 /* 1892 * Note that if we ever decide to split across DSes, 1893 * then we may need to handle dense-like offsets. 1894 */ 1895 hdr->args.offset = offset; 1896 1897 /* Perform an asynchronous write */ 1898 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1899 vers == 3 ? &ff_layout_write_call_ops_v3 : 1900 &ff_layout_write_call_ops_v4, 1901 sync, RPC_TASK_SOFTCONN); 1902 put_cred(ds_cred); 1903 return PNFS_ATTEMPTED; 1904 1905 out_failed: 1906 if (ff_layout_avoid_mds_available_ds(lseg)) 1907 return PNFS_TRY_AGAIN; 1908 trace_pnfs_mds_fallback_write_pagelist(hdr->inode, 1909 hdr->args.offset, hdr->args.count, 1910 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg); 1911 return PNFS_NOT_ATTEMPTED; 1912 } 1913 1914 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1915 { 1916 return i; 1917 } 1918 1919 static struct nfs_fh * 1920 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1921 { 1922 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1923 1924 /* FIXME: Assume that there is only one NFS version available 1925 * for the DS. 1926 */ 1927 return &flseg->mirror_array[i]->fh_versions[0]; 1928 } 1929 1930 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 1931 { 1932 struct pnfs_layout_segment *lseg = data->lseg; 1933 struct nfs4_pnfs_ds *ds; 1934 struct rpc_clnt *ds_clnt; 1935 struct nfs4_ff_layout_mirror *mirror; 1936 const struct cred *ds_cred; 1937 u32 idx; 1938 int vers, ret; 1939 struct nfs_fh *fh; 1940 1941 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 1942 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 1943 goto out_err; 1944 1945 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1946 mirror = FF_LAYOUT_COMP(lseg, idx); 1947 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1948 if (!ds) 1949 goto out_err; 1950 1951 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1952 data->inode); 1953 if (IS_ERR(ds_clnt)) 1954 goto out_err; 1955 1956 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred); 1957 if (!ds_cred) 1958 goto out_err; 1959 1960 vers = nfs4_ff_layout_ds_version(mirror); 1961 1962 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 1963 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 1964 vers); 1965 data->commit_done_cb = ff_layout_commit_done_cb; 1966 data->cred = ds_cred; 1967 refcount_inc(&ds->ds_clp->cl_count); 1968 data->ds_clp = ds->ds_clp; 1969 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1970 if (fh) 1971 data->args.fh = fh; 1972 1973 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 1974 vers == 3 ? &ff_layout_commit_call_ops_v3 : 1975 &ff_layout_commit_call_ops_v4, 1976 how, RPC_TASK_SOFTCONN); 1977 put_cred(ds_cred); 1978 return ret; 1979 out_err: 1980 pnfs_generic_prepare_to_resend_writes(data); 1981 pnfs_generic_commit_release(data); 1982 return -EAGAIN; 1983 } 1984 1985 static int 1986 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1987 int how, struct nfs_commit_info *cinfo) 1988 { 1989 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1990 ff_layout_initiate_commit); 1991 } 1992 1993 static struct pnfs_ds_commit_info * 1994 ff_layout_get_ds_info(struct inode *inode) 1995 { 1996 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1997 1998 if (layout == NULL) 1999 return NULL; 2000 2001 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 2002 } 2003 2004 static void 2005 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 2006 { 2007 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 2008 id_node)); 2009 } 2010 2011 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 2012 const struct nfs4_layoutreturn_args *args, 2013 const struct nfs4_flexfile_layoutreturn_args *ff_args) 2014 { 2015 __be32 *start; 2016 2017 start = xdr_reserve_space(xdr, 4); 2018 if (unlikely(!start)) 2019 return -E2BIG; 2020 2021 *start = cpu_to_be32(ff_args->num_errors); 2022 /* This assume we always return _ALL_ layouts */ 2023 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 2024 } 2025 2026 static void 2027 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len) 2028 { 2029 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0); 2030 } 2031 2032 static void 2033 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 2034 const nfs4_stateid *stateid, 2035 const struct nfs42_layoutstat_devinfo *devinfo) 2036 { 2037 __be32 *p; 2038 2039 p = xdr_reserve_space(xdr, 8 + 8); 2040 p = xdr_encode_hyper(p, devinfo->offset); 2041 p = xdr_encode_hyper(p, devinfo->length); 2042 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 2043 p = xdr_reserve_space(xdr, 4*8); 2044 p = xdr_encode_hyper(p, devinfo->read_count); 2045 p = xdr_encode_hyper(p, devinfo->read_bytes); 2046 p = xdr_encode_hyper(p, devinfo->write_count); 2047 p = xdr_encode_hyper(p, devinfo->write_bytes); 2048 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 2049 } 2050 2051 static void 2052 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 2053 const nfs4_stateid *stateid, 2054 const struct nfs42_layoutstat_devinfo *devinfo) 2055 { 2056 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 2057 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 2058 devinfo->ld_private.data); 2059 } 2060 2061 /* report nothing for now */ 2062 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 2063 const struct nfs4_layoutreturn_args *args, 2064 struct nfs4_flexfile_layoutreturn_args *ff_args) 2065 { 2066 __be32 *p; 2067 int i; 2068 2069 p = xdr_reserve_space(xdr, 4); 2070 *p = cpu_to_be32(ff_args->num_dev); 2071 for (i = 0; i < ff_args->num_dev; i++) 2072 ff_layout_encode_ff_iostat(xdr, 2073 &args->layout->plh_stateid, 2074 &ff_args->devinfo[i]); 2075 } 2076 2077 static void 2078 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 2079 unsigned int num_entries) 2080 { 2081 unsigned int i; 2082 2083 for (i = 0; i < num_entries; i++) { 2084 if (!devinfo[i].ld_private.ops) 2085 continue; 2086 if (!devinfo[i].ld_private.ops->free) 2087 continue; 2088 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 2089 } 2090 } 2091 2092 static struct nfs4_deviceid_node * 2093 ff_layout_alloc_deviceid_node(struct nfs_server *server, 2094 struct pnfs_device *pdev, gfp_t gfp_flags) 2095 { 2096 struct nfs4_ff_layout_ds *dsaddr; 2097 2098 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2099 if (!dsaddr) 2100 return NULL; 2101 return &dsaddr->id_node; 2102 } 2103 2104 static void 2105 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2106 const void *voidargs, 2107 const struct nfs4_xdr_opaque_data *ff_opaque) 2108 { 2109 const struct nfs4_layoutreturn_args *args = voidargs; 2110 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2111 struct xdr_buf tmp_buf = { 2112 .head = { 2113 [0] = { 2114 .iov_base = page_address(ff_args->pages[0]), 2115 }, 2116 }, 2117 .buflen = PAGE_SIZE, 2118 }; 2119 struct xdr_stream tmp_xdr; 2120 __be32 *start; 2121 2122 dprintk("%s: Begin\n", __func__); 2123 2124 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL); 2125 2126 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2127 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2128 2129 start = xdr_reserve_space(xdr, 4); 2130 *start = cpu_to_be32(tmp_buf.len); 2131 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2132 2133 dprintk("%s: Return\n", __func__); 2134 } 2135 2136 static void 2137 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2138 { 2139 struct nfs4_flexfile_layoutreturn_args *ff_args; 2140 2141 if (!args->data) 2142 return; 2143 ff_args = args->data; 2144 args->data = NULL; 2145 2146 ff_layout_free_ds_ioerr(&ff_args->errors); 2147 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2148 2149 put_page(ff_args->pages[0]); 2150 kfree(ff_args); 2151 } 2152 2153 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2154 .encode = ff_layout_encode_layoutreturn, 2155 .free = ff_layout_free_layoutreturn, 2156 }; 2157 2158 static int 2159 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2160 { 2161 struct nfs4_flexfile_layoutreturn_args *ff_args; 2162 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2163 2164 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL); 2165 if (!ff_args) 2166 goto out_nomem; 2167 ff_args->pages[0] = alloc_page(GFP_KERNEL); 2168 if (!ff_args->pages[0]) 2169 goto out_nomem_free; 2170 2171 INIT_LIST_HEAD(&ff_args->errors); 2172 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2173 &args->range, &ff_args->errors, 2174 FF_LAYOUTRETURN_MAXERR); 2175 2176 spin_lock(&args->inode->i_lock); 2177 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2178 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo)); 2179 spin_unlock(&args->inode->i_lock); 2180 2181 args->ld_private->ops = &layoutreturn_ops; 2182 args->ld_private->data = ff_args; 2183 return 0; 2184 out_nomem_free: 2185 kfree(ff_args); 2186 out_nomem: 2187 return -ENOMEM; 2188 } 2189 2190 #ifdef CONFIG_NFS_V4_2 2191 void 2192 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2193 { 2194 struct pnfs_layout_hdr *lo = lseg->pls_layout; 2195 struct nfs42_layout_error *errors; 2196 LIST_HEAD(head); 2197 2198 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) 2199 return; 2200 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); 2201 if (list_empty(&head)) 2202 return; 2203 2204 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, 2205 sizeof(*errors), GFP_NOFS); 2206 if (errors != NULL) { 2207 const struct nfs4_ff_layout_ds_err *pos; 2208 size_t n = 0; 2209 2210 list_for_each_entry(pos, &head, list) { 2211 errors[n].offset = pos->offset; 2212 errors[n].length = pos->length; 2213 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); 2214 errors[n].errors[0].dev_id = pos->deviceid; 2215 errors[n].errors[0].status = pos->status; 2216 errors[n].errors[0].opnum = pos->opnum; 2217 n++; 2218 if (!list_is_last(&pos->list, &head) && 2219 n < NFS42_LAYOUTERROR_MAX) 2220 continue; 2221 if (nfs42_proc_layouterror(lseg, errors, n) < 0) 2222 break; 2223 n = 0; 2224 } 2225 kfree(errors); 2226 } 2227 ff_layout_free_ds_ioerr(&head); 2228 } 2229 #else 2230 void 2231 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2232 { 2233 } 2234 #endif 2235 2236 static int 2237 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2238 { 2239 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2240 2241 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2242 } 2243 2244 static size_t 2245 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2246 const int buflen) 2247 { 2248 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2249 const struct in6_addr *addr = &sin6->sin6_addr; 2250 2251 /* 2252 * RFC 4291, Section 2.2.2 2253 * 2254 * Shorthanded ANY address 2255 */ 2256 if (ipv6_addr_any(addr)) 2257 return snprintf(buf, buflen, "::"); 2258 2259 /* 2260 * RFC 4291, Section 2.2.2 2261 * 2262 * Shorthanded loopback address 2263 */ 2264 if (ipv6_addr_loopback(addr)) 2265 return snprintf(buf, buflen, "::1"); 2266 2267 /* 2268 * RFC 4291, Section 2.2.3 2269 * 2270 * Special presentation address format for mapped v4 2271 * addresses. 2272 */ 2273 if (ipv6_addr_v4mapped(addr)) 2274 return snprintf(buf, buflen, "::ffff:%pI4", 2275 &addr->s6_addr32[3]); 2276 2277 /* 2278 * RFC 4291, Section 2.2.1 2279 */ 2280 return snprintf(buf, buflen, "%pI6c", addr); 2281 } 2282 2283 /* Derived from rpc_sockaddr2uaddr */ 2284 static void 2285 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2286 { 2287 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2288 char portbuf[RPCBIND_MAXUADDRPLEN]; 2289 char addrbuf[RPCBIND_MAXUADDRLEN]; 2290 char *netid; 2291 unsigned short port; 2292 int len, netid_len; 2293 __be32 *p; 2294 2295 switch (sap->sa_family) { 2296 case AF_INET: 2297 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2298 return; 2299 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2300 netid = "tcp"; 2301 netid_len = 3; 2302 break; 2303 case AF_INET6: 2304 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2305 return; 2306 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2307 netid = "tcp6"; 2308 netid_len = 4; 2309 break; 2310 default: 2311 /* we only support tcp and tcp6 */ 2312 WARN_ON_ONCE(1); 2313 return; 2314 } 2315 2316 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2317 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2318 2319 p = xdr_reserve_space(xdr, 4 + netid_len); 2320 xdr_encode_opaque(p, netid, netid_len); 2321 2322 p = xdr_reserve_space(xdr, 4 + len); 2323 xdr_encode_opaque(p, addrbuf, len); 2324 } 2325 2326 static void 2327 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2328 ktime_t t) 2329 { 2330 struct timespec64 ts; 2331 __be32 *p; 2332 2333 p = xdr_reserve_space(xdr, 12); 2334 ts = ktime_to_timespec64(t); 2335 p = xdr_encode_hyper(p, ts.tv_sec); 2336 *p++ = cpu_to_be32(ts.tv_nsec); 2337 } 2338 2339 static void 2340 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2341 struct nfs4_ff_io_stat *stat) 2342 { 2343 __be32 *p; 2344 2345 p = xdr_reserve_space(xdr, 5 * 8); 2346 p = xdr_encode_hyper(p, stat->ops_requested); 2347 p = xdr_encode_hyper(p, stat->bytes_requested); 2348 p = xdr_encode_hyper(p, stat->ops_completed); 2349 p = xdr_encode_hyper(p, stat->bytes_completed); 2350 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2351 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2352 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2353 } 2354 2355 static void 2356 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2357 const struct nfs42_layoutstat_devinfo *devinfo, 2358 struct nfs4_ff_layout_mirror *mirror) 2359 { 2360 struct nfs4_pnfs_ds_addr *da; 2361 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds; 2362 struct nfs_fh *fh = &mirror->fh_versions[0]; 2363 __be32 *p; 2364 2365 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2366 dprintk("%s: DS %s: encoding address %s\n", 2367 __func__, ds->ds_remotestr, da->da_remotestr); 2368 /* netaddr4 */ 2369 ff_layout_encode_netaddr(xdr, da); 2370 /* nfs_fh4 */ 2371 p = xdr_reserve_space(xdr, 4 + fh->size); 2372 xdr_encode_opaque(p, fh->data, fh->size); 2373 /* ff_io_latency4 read */ 2374 spin_lock(&mirror->lock); 2375 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat); 2376 /* ff_io_latency4 write */ 2377 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat); 2378 spin_unlock(&mirror->lock); 2379 /* nfstime4 */ 2380 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time)); 2381 /* bool */ 2382 p = xdr_reserve_space(xdr, 4); 2383 *p = cpu_to_be32(false); 2384 } 2385 2386 static void 2387 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2388 const struct nfs4_xdr_opaque_data *opaque) 2389 { 2390 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2391 struct nfs42_layoutstat_devinfo, ld_private); 2392 __be32 *start; 2393 2394 /* layoutupdate length */ 2395 start = xdr_reserve_space(xdr, 4); 2396 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2397 2398 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2399 } 2400 2401 static void 2402 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2403 { 2404 struct nfs4_ff_layout_mirror *mirror = opaque->data; 2405 2406 ff_layout_put_mirror(mirror); 2407 } 2408 2409 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2410 .encode = ff_layout_encode_layoutstats, 2411 .free = ff_layout_free_layoutstats, 2412 }; 2413 2414 static int 2415 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2416 struct nfs42_layoutstat_devinfo *devinfo, 2417 int dev_limit) 2418 { 2419 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2420 struct nfs4_ff_layout_mirror *mirror; 2421 struct nfs4_deviceid_node *dev; 2422 int i = 0; 2423 2424 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2425 if (i >= dev_limit) 2426 break; 2427 if (IS_ERR_OR_NULL(mirror->mirror_ds)) 2428 continue; 2429 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags)) 2430 continue; 2431 /* mirror refcount put in cleanup_layoutstats */ 2432 if (!refcount_inc_not_zero(&mirror->ref)) 2433 continue; 2434 dev = &mirror->mirror_ds->id_node; 2435 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE); 2436 devinfo->offset = 0; 2437 devinfo->length = NFS4_MAX_UINT64; 2438 spin_lock(&mirror->lock); 2439 devinfo->read_count = mirror->read_stat.io_stat.ops_completed; 2440 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed; 2441 devinfo->write_count = mirror->write_stat.io_stat.ops_completed; 2442 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed; 2443 spin_unlock(&mirror->lock); 2444 devinfo->layout_type = LAYOUT_FLEX_FILES; 2445 devinfo->ld_private.ops = &layoutstat_ops; 2446 devinfo->ld_private.data = mirror; 2447 2448 devinfo++; 2449 i++; 2450 } 2451 return i; 2452 } 2453 2454 static int 2455 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2456 { 2457 struct nfs4_flexfile_layout *ff_layout; 2458 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2459 2460 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2461 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO); 2462 if (!args->devinfo) 2463 return -ENOMEM; 2464 2465 spin_lock(&args->inode->i_lock); 2466 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout); 2467 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2468 &args->devinfo[0], dev_count); 2469 spin_unlock(&args->inode->i_lock); 2470 if (!args->num_dev) { 2471 kfree(args->devinfo); 2472 args->devinfo = NULL; 2473 return -ENOENT; 2474 } 2475 2476 return 0; 2477 } 2478 2479 static int 2480 ff_layout_set_layoutdriver(struct nfs_server *server, 2481 const struct nfs_fh *dummy) 2482 { 2483 #if IS_ENABLED(CONFIG_NFS_V4_2) 2484 server->caps |= NFS_CAP_LAYOUTSTATS; 2485 #endif 2486 return 0; 2487 } 2488 2489 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2490 .id = LAYOUT_FLEX_FILES, 2491 .name = "LAYOUT_FLEX_FILES", 2492 .owner = THIS_MODULE, 2493 .flags = PNFS_LAYOUTGET_ON_OPEN, 2494 .max_layoutget_response = 4096, /* 1 page or so... */ 2495 .set_layoutdriver = ff_layout_set_layoutdriver, 2496 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2497 .free_layout_hdr = ff_layout_free_layout_hdr, 2498 .alloc_lseg = ff_layout_alloc_lseg, 2499 .free_lseg = ff_layout_free_lseg, 2500 .add_lseg = ff_layout_add_lseg, 2501 .pg_read_ops = &ff_layout_pg_read_ops, 2502 .pg_write_ops = &ff_layout_pg_write_ops, 2503 .get_ds_info = ff_layout_get_ds_info, 2504 .free_deviceid_node = ff_layout_free_deviceid_node, 2505 .mark_request_commit = pnfs_layout_mark_request_commit, 2506 .clear_request_commit = pnfs_generic_clear_request_commit, 2507 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2508 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2509 .commit_pagelist = ff_layout_commit_pagelist, 2510 .read_pagelist = ff_layout_read_pagelist, 2511 .write_pagelist = ff_layout_write_pagelist, 2512 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 2513 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 2514 .sync = pnfs_nfs_generic_sync, 2515 .prepare_layoutstats = ff_layout_prepare_layoutstats, 2516 }; 2517 2518 static int __init nfs4flexfilelayout_init(void) 2519 { 2520 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 2521 __func__); 2522 return pnfs_register_layoutdriver(&flexfilelayout_type); 2523 } 2524 2525 static void __exit nfs4flexfilelayout_exit(void) 2526 { 2527 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 2528 __func__); 2529 pnfs_unregister_layoutdriver(&flexfilelayout_type); 2530 } 2531 2532 MODULE_ALIAS("nfs-layouttype4-4"); 2533 2534 MODULE_LICENSE("GPL"); 2535 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 2536 2537 module_init(nfs4flexfilelayout_init); 2538 module_exit(nfs4flexfilelayout_exit); 2539 2540 module_param(io_maxretrans, ushort, 0644); 2541 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client " 2542 "retries an I/O request before returning an error. "); 2543