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 *op_status, int opnum, int error) 1270 { 1271 struct nfs4_ff_layout_mirror *mirror; 1272 u32 status = *op_status; 1273 int err; 1274 1275 if (status == 0) { 1276 switch (error) { 1277 case -ETIMEDOUT: 1278 case -EPFNOSUPPORT: 1279 case -EPROTONOSUPPORT: 1280 case -EOPNOTSUPP: 1281 case -ECONNREFUSED: 1282 case -ECONNRESET: 1283 case -EHOSTDOWN: 1284 case -EHOSTUNREACH: 1285 case -ENETUNREACH: 1286 case -EADDRINUSE: 1287 case -ENOBUFS: 1288 case -EPIPE: 1289 case -EPERM: 1290 *op_status = status = NFS4ERR_NXIO; 1291 break; 1292 case -EACCES: 1293 *op_status = status = NFS4ERR_ACCESS; 1294 break; 1295 default: 1296 return; 1297 } 1298 } 1299 1300 switch (status) { 1301 case NFS4ERR_DELAY: 1302 case NFS4ERR_GRACE: 1303 return; 1304 default: 1305 break; 1306 } 1307 1308 mirror = FF_LAYOUT_COMP(lseg, idx); 1309 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1310 mirror, offset, length, status, opnum, 1311 GFP_NOIO); 1312 if (status == NFS4ERR_NXIO) 1313 ff_layout_mark_ds_unreachable(lseg, idx); 1314 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg); 1315 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1316 } 1317 1318 /* NFS_PROTO call done callback routines */ 1319 static int ff_layout_read_done_cb(struct rpc_task *task, 1320 struct nfs_pgio_header *hdr) 1321 { 1322 int new_idx = hdr->pgio_mirror_idx; 1323 int err; 1324 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 trace_ff_layout_read_error(hdr); 1331 } 1332 1333 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1334 hdr->ds_clp, hdr->lseg, 1335 hdr->pgio_mirror_idx); 1336 1337 trace_nfs4_pnfs_read(hdr, err); 1338 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1339 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1340 switch (err) { 1341 case -NFS4ERR_RESET_TO_PNFS: 1342 if (ff_layout_choose_best_ds_for_read(hdr->lseg, 1343 hdr->pgio_mirror_idx + 1, 1344 &new_idx)) 1345 goto out_layouterror; 1346 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1347 return task->tk_status; 1348 case -NFS4ERR_RESET_TO_MDS: 1349 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1350 return task->tk_status; 1351 case -EAGAIN: 1352 goto out_eagain; 1353 } 1354 1355 return 0; 1356 out_layouterror: 1357 ff_layout_read_record_layoutstats_done(task, hdr); 1358 ff_layout_send_layouterror(hdr->lseg); 1359 hdr->pgio_mirror_idx = new_idx; 1360 out_eagain: 1361 rpc_restart_call_prepare(task); 1362 return -EAGAIN; 1363 } 1364 1365 static bool 1366 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1367 { 1368 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1369 } 1370 1371 /* 1372 * We reference the rpc_cred of the first WRITE that triggers the need for 1373 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1374 * rfc5661 is not clear about which credential should be used. 1375 * 1376 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1377 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1378 * we always send layoutcommit after DS writes. 1379 */ 1380 static void 1381 ff_layout_set_layoutcommit(struct inode *inode, 1382 struct pnfs_layout_segment *lseg, 1383 loff_t end_offset) 1384 { 1385 if (!ff_layout_need_layoutcommit(lseg)) 1386 return; 1387 1388 pnfs_set_layoutcommit(inode, lseg, end_offset); 1389 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1390 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1391 } 1392 1393 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1394 struct nfs_pgio_header *hdr) 1395 { 1396 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1397 return; 1398 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1399 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1400 hdr->args.count, 1401 task->tk_start); 1402 } 1403 1404 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1405 struct nfs_pgio_header *hdr) 1406 { 1407 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1408 return; 1409 nfs4_ff_layout_stat_io_end_read(task, 1410 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1411 hdr->args.count, 1412 hdr->res.count); 1413 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1414 } 1415 1416 static int ff_layout_read_prepare_common(struct rpc_task *task, 1417 struct nfs_pgio_header *hdr) 1418 { 1419 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1420 rpc_exit(task, -EIO); 1421 return -EIO; 1422 } 1423 1424 ff_layout_read_record_layoutstats_start(task, hdr); 1425 return 0; 1426 } 1427 1428 /* 1429 * Call ops for the async read/write cases 1430 * In the case of dense layouts, the offset needs to be reset to its 1431 * original value. 1432 */ 1433 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1434 { 1435 struct nfs_pgio_header *hdr = data; 1436 1437 if (ff_layout_read_prepare_common(task, hdr)) 1438 return; 1439 1440 rpc_call_start(task); 1441 } 1442 1443 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1444 { 1445 struct nfs_pgio_header *hdr = data; 1446 1447 if (nfs4_setup_sequence(hdr->ds_clp, 1448 &hdr->args.seq_args, 1449 &hdr->res.seq_res, 1450 task)) 1451 return; 1452 1453 ff_layout_read_prepare_common(task, hdr); 1454 } 1455 1456 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1457 { 1458 struct nfs_pgio_header *hdr = data; 1459 1460 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 1461 1462 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1463 task->tk_status == 0) { 1464 nfs4_sequence_done(task, &hdr->res.seq_res); 1465 return; 1466 } 1467 1468 /* Note this may cause RPC to be resent */ 1469 hdr->mds_ops->rpc_call_done(task, hdr); 1470 } 1471 1472 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1473 { 1474 struct nfs_pgio_header *hdr = data; 1475 1476 ff_layout_read_record_layoutstats_done(task, hdr); 1477 rpc_count_iostats_metrics(task, 1478 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1479 } 1480 1481 static void ff_layout_read_release(void *data) 1482 { 1483 struct nfs_pgio_header *hdr = data; 1484 1485 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1486 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1487 ff_layout_send_layouterror(hdr->lseg); 1488 pnfs_read_resend_pnfs(hdr); 1489 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1490 ff_layout_reset_read(hdr); 1491 pnfs_generic_rw_release(data); 1492 } 1493 1494 1495 static int ff_layout_write_done_cb(struct rpc_task *task, 1496 struct nfs_pgio_header *hdr) 1497 { 1498 loff_t end_offs = 0; 1499 int err; 1500 1501 if (task->tk_status < 0) { 1502 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1503 hdr->args.offset, hdr->args.count, 1504 &hdr->res.op_status, OP_WRITE, 1505 task->tk_status); 1506 trace_ff_layout_write_error(hdr); 1507 } 1508 1509 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1510 hdr->ds_clp, hdr->lseg, 1511 hdr->pgio_mirror_idx); 1512 1513 trace_nfs4_pnfs_write(hdr, err); 1514 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1515 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1516 switch (err) { 1517 case -NFS4ERR_RESET_TO_PNFS: 1518 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1519 return task->tk_status; 1520 case -NFS4ERR_RESET_TO_MDS: 1521 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1522 return task->tk_status; 1523 case -EAGAIN: 1524 return -EAGAIN; 1525 } 1526 1527 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1528 hdr->res.verf->committed == NFS_DATA_SYNC) 1529 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1530 1531 /* Note: if the write is unstable, don't set end_offs until commit */ 1532 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1533 1534 /* zero out fattr since we don't care DS attr at all */ 1535 hdr->fattr.valid = 0; 1536 if (task->tk_status >= 0) 1537 nfs_writeback_update_inode(hdr); 1538 1539 return 0; 1540 } 1541 1542 static int ff_layout_commit_done_cb(struct rpc_task *task, 1543 struct nfs_commit_data *data) 1544 { 1545 int err; 1546 1547 if (task->tk_status < 0) { 1548 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index, 1549 data->args.offset, data->args.count, 1550 &data->res.op_status, OP_COMMIT, 1551 task->tk_status); 1552 trace_ff_layout_commit_error(data); 1553 } 1554 1555 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1556 data->lseg, data->ds_commit_index); 1557 1558 trace_nfs4_pnfs_commit_ds(data, err); 1559 switch (err) { 1560 case -NFS4ERR_RESET_TO_PNFS: 1561 pnfs_generic_prepare_to_resend_writes(data); 1562 return -EAGAIN; 1563 case -NFS4ERR_RESET_TO_MDS: 1564 pnfs_generic_prepare_to_resend_writes(data); 1565 return -EAGAIN; 1566 case -EAGAIN: 1567 rpc_restart_call_prepare(task); 1568 return -EAGAIN; 1569 } 1570 1571 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1572 1573 return 0; 1574 } 1575 1576 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1577 struct nfs_pgio_header *hdr) 1578 { 1579 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1580 return; 1581 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1582 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1583 hdr->args.count, 1584 task->tk_start); 1585 } 1586 1587 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1588 struct nfs_pgio_header *hdr) 1589 { 1590 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1591 return; 1592 nfs4_ff_layout_stat_io_end_write(task, 1593 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1594 hdr->args.count, hdr->res.count, 1595 hdr->res.verf->committed); 1596 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1597 } 1598 1599 static int ff_layout_write_prepare_common(struct rpc_task *task, 1600 struct nfs_pgio_header *hdr) 1601 { 1602 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1603 rpc_exit(task, -EIO); 1604 return -EIO; 1605 } 1606 1607 ff_layout_write_record_layoutstats_start(task, hdr); 1608 return 0; 1609 } 1610 1611 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1612 { 1613 struct nfs_pgio_header *hdr = data; 1614 1615 if (ff_layout_write_prepare_common(task, hdr)) 1616 return; 1617 1618 rpc_call_start(task); 1619 } 1620 1621 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1622 { 1623 struct nfs_pgio_header *hdr = data; 1624 1625 if (nfs4_setup_sequence(hdr->ds_clp, 1626 &hdr->args.seq_args, 1627 &hdr->res.seq_res, 1628 task)) 1629 return; 1630 1631 ff_layout_write_prepare_common(task, hdr); 1632 } 1633 1634 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1635 { 1636 struct nfs_pgio_header *hdr = data; 1637 1638 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1639 task->tk_status == 0) { 1640 nfs4_sequence_done(task, &hdr->res.seq_res); 1641 return; 1642 } 1643 1644 /* Note this may cause RPC to be resent */ 1645 hdr->mds_ops->rpc_call_done(task, hdr); 1646 } 1647 1648 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1649 { 1650 struct nfs_pgio_header *hdr = data; 1651 1652 ff_layout_write_record_layoutstats_done(task, hdr); 1653 rpc_count_iostats_metrics(task, 1654 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1655 } 1656 1657 static void ff_layout_write_release(void *data) 1658 { 1659 struct nfs_pgio_header *hdr = data; 1660 1661 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1662 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1663 ff_layout_send_layouterror(hdr->lseg); 1664 ff_layout_reset_write(hdr, true); 1665 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1666 ff_layout_reset_write(hdr, false); 1667 pnfs_generic_rw_release(data); 1668 } 1669 1670 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1671 struct nfs_commit_data *cdata) 1672 { 1673 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1674 return; 1675 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1676 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1677 0, task->tk_start); 1678 } 1679 1680 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1681 struct nfs_commit_data *cdata) 1682 { 1683 struct nfs_page *req; 1684 __u64 count = 0; 1685 1686 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1687 return; 1688 1689 if (task->tk_status == 0) { 1690 list_for_each_entry(req, &cdata->pages, wb_list) 1691 count += req->wb_bytes; 1692 } 1693 nfs4_ff_layout_stat_io_end_write(task, 1694 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1695 count, count, NFS_FILE_SYNC); 1696 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 1697 } 1698 1699 static void ff_layout_commit_prepare_common(struct rpc_task *task, 1700 struct nfs_commit_data *cdata) 1701 { 1702 ff_layout_commit_record_layoutstats_start(task, cdata); 1703 } 1704 1705 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1706 { 1707 ff_layout_commit_prepare_common(task, data); 1708 rpc_call_start(task); 1709 } 1710 1711 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1712 { 1713 struct nfs_commit_data *wdata = data; 1714 1715 if (nfs4_setup_sequence(wdata->ds_clp, 1716 &wdata->args.seq_args, 1717 &wdata->res.seq_res, 1718 task)) 1719 return; 1720 ff_layout_commit_prepare_common(task, data); 1721 } 1722 1723 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1724 { 1725 pnfs_generic_write_commit_done(task, data); 1726 } 1727 1728 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1729 { 1730 struct nfs_commit_data *cdata = data; 1731 1732 ff_layout_commit_record_layoutstats_done(task, cdata); 1733 rpc_count_iostats_metrics(task, 1734 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1735 } 1736 1737 static void ff_layout_commit_release(void *data) 1738 { 1739 struct nfs_commit_data *cdata = data; 1740 1741 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1742 pnfs_generic_commit_release(data); 1743 } 1744 1745 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1746 .rpc_call_prepare = ff_layout_read_prepare_v3, 1747 .rpc_call_done = ff_layout_read_call_done, 1748 .rpc_count_stats = ff_layout_read_count_stats, 1749 .rpc_release = ff_layout_read_release, 1750 }; 1751 1752 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 1753 .rpc_call_prepare = ff_layout_read_prepare_v4, 1754 .rpc_call_done = ff_layout_read_call_done, 1755 .rpc_count_stats = ff_layout_read_count_stats, 1756 .rpc_release = ff_layout_read_release, 1757 }; 1758 1759 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1760 .rpc_call_prepare = ff_layout_write_prepare_v3, 1761 .rpc_call_done = ff_layout_write_call_done, 1762 .rpc_count_stats = ff_layout_write_count_stats, 1763 .rpc_release = ff_layout_write_release, 1764 }; 1765 1766 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1767 .rpc_call_prepare = ff_layout_write_prepare_v4, 1768 .rpc_call_done = ff_layout_write_call_done, 1769 .rpc_count_stats = ff_layout_write_count_stats, 1770 .rpc_release = ff_layout_write_release, 1771 }; 1772 1773 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 1774 .rpc_call_prepare = ff_layout_commit_prepare_v3, 1775 .rpc_call_done = ff_layout_commit_done, 1776 .rpc_count_stats = ff_layout_commit_count_stats, 1777 .rpc_release = ff_layout_commit_release, 1778 }; 1779 1780 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 1781 .rpc_call_prepare = ff_layout_commit_prepare_v4, 1782 .rpc_call_done = ff_layout_commit_done, 1783 .rpc_count_stats = ff_layout_commit_count_stats, 1784 .rpc_release = ff_layout_commit_release, 1785 }; 1786 1787 static enum pnfs_try_status 1788 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 1789 { 1790 struct pnfs_layout_segment *lseg = hdr->lseg; 1791 struct nfs4_pnfs_ds *ds; 1792 struct rpc_clnt *ds_clnt; 1793 struct nfs4_ff_layout_mirror *mirror; 1794 const struct cred *ds_cred; 1795 loff_t offset = hdr->args.offset; 1796 u32 idx = hdr->pgio_mirror_idx; 1797 int vers; 1798 struct nfs_fh *fh; 1799 1800 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 1801 __func__, hdr->inode->i_ino, 1802 hdr->args.pgbase, (size_t)hdr->args.count, offset); 1803 1804 mirror = FF_LAYOUT_COMP(lseg, idx); 1805 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 1806 if (!ds) 1807 goto out_failed; 1808 1809 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1810 hdr->inode); 1811 if (IS_ERR(ds_clnt)) 1812 goto out_failed; 1813 1814 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1815 if (!ds_cred) 1816 goto out_failed; 1817 1818 vers = nfs4_ff_layout_ds_version(mirror); 1819 1820 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 1821 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 1822 1823 hdr->pgio_done_cb = ff_layout_read_done_cb; 1824 refcount_inc(&ds->ds_clp->cl_count); 1825 hdr->ds_clp = ds->ds_clp; 1826 fh = nfs4_ff_layout_select_ds_fh(mirror); 1827 if (fh) 1828 hdr->args.fh = fh; 1829 1830 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1831 1832 /* 1833 * Note that if we ever decide to split across DSes, 1834 * then we may need to handle dense-like offsets. 1835 */ 1836 hdr->args.offset = offset; 1837 hdr->mds_offset = offset; 1838 1839 /* Perform an asynchronous read to ds */ 1840 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1841 vers == 3 ? &ff_layout_read_call_ops_v3 : 1842 &ff_layout_read_call_ops_v4, 1843 0, RPC_TASK_SOFTCONN); 1844 put_cred(ds_cred); 1845 return PNFS_ATTEMPTED; 1846 1847 out_failed: 1848 if (ff_layout_avoid_mds_available_ds(lseg)) 1849 return PNFS_TRY_AGAIN; 1850 trace_pnfs_mds_fallback_read_pagelist(hdr->inode, 1851 hdr->args.offset, hdr->args.count, 1852 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg); 1853 return PNFS_NOT_ATTEMPTED; 1854 } 1855 1856 /* Perform async writes. */ 1857 static enum pnfs_try_status 1858 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 1859 { 1860 struct pnfs_layout_segment *lseg = hdr->lseg; 1861 struct nfs4_pnfs_ds *ds; 1862 struct rpc_clnt *ds_clnt; 1863 struct nfs4_ff_layout_mirror *mirror; 1864 const struct cred *ds_cred; 1865 loff_t offset = hdr->args.offset; 1866 int vers; 1867 struct nfs_fh *fh; 1868 int idx = hdr->pgio_mirror_idx; 1869 1870 mirror = FF_LAYOUT_COMP(lseg, idx); 1871 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1872 if (!ds) 1873 goto out_failed; 1874 1875 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1876 hdr->inode); 1877 if (IS_ERR(ds_clnt)) 1878 goto out_failed; 1879 1880 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1881 if (!ds_cred) 1882 goto out_failed; 1883 1884 vers = nfs4_ff_layout_ds_version(mirror); 1885 1886 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 1887 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 1888 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 1889 vers); 1890 1891 hdr->pgio_done_cb = ff_layout_write_done_cb; 1892 refcount_inc(&ds->ds_clp->cl_count); 1893 hdr->ds_clp = ds->ds_clp; 1894 hdr->ds_commit_idx = idx; 1895 fh = nfs4_ff_layout_select_ds_fh(mirror); 1896 if (fh) 1897 hdr->args.fh = fh; 1898 1899 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1900 1901 /* 1902 * Note that if we ever decide to split across DSes, 1903 * then we may need to handle dense-like offsets. 1904 */ 1905 hdr->args.offset = offset; 1906 1907 /* Perform an asynchronous write */ 1908 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1909 vers == 3 ? &ff_layout_write_call_ops_v3 : 1910 &ff_layout_write_call_ops_v4, 1911 sync, RPC_TASK_SOFTCONN); 1912 put_cred(ds_cred); 1913 return PNFS_ATTEMPTED; 1914 1915 out_failed: 1916 if (ff_layout_avoid_mds_available_ds(lseg)) 1917 return PNFS_TRY_AGAIN; 1918 trace_pnfs_mds_fallback_write_pagelist(hdr->inode, 1919 hdr->args.offset, hdr->args.count, 1920 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg); 1921 return PNFS_NOT_ATTEMPTED; 1922 } 1923 1924 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1925 { 1926 return i; 1927 } 1928 1929 static struct nfs_fh * 1930 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1931 { 1932 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1933 1934 /* FIXME: Assume that there is only one NFS version available 1935 * for the DS. 1936 */ 1937 return &flseg->mirror_array[i]->fh_versions[0]; 1938 } 1939 1940 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 1941 { 1942 struct pnfs_layout_segment *lseg = data->lseg; 1943 struct nfs4_pnfs_ds *ds; 1944 struct rpc_clnt *ds_clnt; 1945 struct nfs4_ff_layout_mirror *mirror; 1946 const struct cred *ds_cred; 1947 u32 idx; 1948 int vers, ret; 1949 struct nfs_fh *fh; 1950 1951 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 1952 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 1953 goto out_err; 1954 1955 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1956 mirror = FF_LAYOUT_COMP(lseg, idx); 1957 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1958 if (!ds) 1959 goto out_err; 1960 1961 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1962 data->inode); 1963 if (IS_ERR(ds_clnt)) 1964 goto out_err; 1965 1966 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred); 1967 if (!ds_cred) 1968 goto out_err; 1969 1970 vers = nfs4_ff_layout_ds_version(mirror); 1971 1972 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 1973 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 1974 vers); 1975 data->commit_done_cb = ff_layout_commit_done_cb; 1976 data->cred = ds_cred; 1977 refcount_inc(&ds->ds_clp->cl_count); 1978 data->ds_clp = ds->ds_clp; 1979 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1980 if (fh) 1981 data->args.fh = fh; 1982 1983 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 1984 vers == 3 ? &ff_layout_commit_call_ops_v3 : 1985 &ff_layout_commit_call_ops_v4, 1986 how, RPC_TASK_SOFTCONN); 1987 put_cred(ds_cred); 1988 return ret; 1989 out_err: 1990 pnfs_generic_prepare_to_resend_writes(data); 1991 pnfs_generic_commit_release(data); 1992 return -EAGAIN; 1993 } 1994 1995 static int 1996 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1997 int how, struct nfs_commit_info *cinfo) 1998 { 1999 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 2000 ff_layout_initiate_commit); 2001 } 2002 2003 static struct pnfs_ds_commit_info * 2004 ff_layout_get_ds_info(struct inode *inode) 2005 { 2006 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 2007 2008 if (layout == NULL) 2009 return NULL; 2010 2011 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 2012 } 2013 2014 static void 2015 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 2016 { 2017 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 2018 id_node)); 2019 } 2020 2021 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 2022 const struct nfs4_layoutreturn_args *args, 2023 const struct nfs4_flexfile_layoutreturn_args *ff_args) 2024 { 2025 __be32 *start; 2026 2027 start = xdr_reserve_space(xdr, 4); 2028 if (unlikely(!start)) 2029 return -E2BIG; 2030 2031 *start = cpu_to_be32(ff_args->num_errors); 2032 /* This assume we always return _ALL_ layouts */ 2033 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 2034 } 2035 2036 static void 2037 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len) 2038 { 2039 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0); 2040 } 2041 2042 static void 2043 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 2044 const nfs4_stateid *stateid, 2045 const struct nfs42_layoutstat_devinfo *devinfo) 2046 { 2047 __be32 *p; 2048 2049 p = xdr_reserve_space(xdr, 8 + 8); 2050 p = xdr_encode_hyper(p, devinfo->offset); 2051 p = xdr_encode_hyper(p, devinfo->length); 2052 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 2053 p = xdr_reserve_space(xdr, 4*8); 2054 p = xdr_encode_hyper(p, devinfo->read_count); 2055 p = xdr_encode_hyper(p, devinfo->read_bytes); 2056 p = xdr_encode_hyper(p, devinfo->write_count); 2057 p = xdr_encode_hyper(p, devinfo->write_bytes); 2058 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 2059 } 2060 2061 static void 2062 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 2063 const nfs4_stateid *stateid, 2064 const struct nfs42_layoutstat_devinfo *devinfo) 2065 { 2066 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 2067 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 2068 devinfo->ld_private.data); 2069 } 2070 2071 /* report nothing for now */ 2072 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 2073 const struct nfs4_layoutreturn_args *args, 2074 struct nfs4_flexfile_layoutreturn_args *ff_args) 2075 { 2076 __be32 *p; 2077 int i; 2078 2079 p = xdr_reserve_space(xdr, 4); 2080 *p = cpu_to_be32(ff_args->num_dev); 2081 for (i = 0; i < ff_args->num_dev; i++) 2082 ff_layout_encode_ff_iostat(xdr, 2083 &args->layout->plh_stateid, 2084 &ff_args->devinfo[i]); 2085 } 2086 2087 static void 2088 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 2089 unsigned int num_entries) 2090 { 2091 unsigned int i; 2092 2093 for (i = 0; i < num_entries; i++) { 2094 if (!devinfo[i].ld_private.ops) 2095 continue; 2096 if (!devinfo[i].ld_private.ops->free) 2097 continue; 2098 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 2099 } 2100 } 2101 2102 static struct nfs4_deviceid_node * 2103 ff_layout_alloc_deviceid_node(struct nfs_server *server, 2104 struct pnfs_device *pdev, gfp_t gfp_flags) 2105 { 2106 struct nfs4_ff_layout_ds *dsaddr; 2107 2108 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2109 if (!dsaddr) 2110 return NULL; 2111 return &dsaddr->id_node; 2112 } 2113 2114 static void 2115 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2116 const void *voidargs, 2117 const struct nfs4_xdr_opaque_data *ff_opaque) 2118 { 2119 const struct nfs4_layoutreturn_args *args = voidargs; 2120 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2121 struct xdr_buf tmp_buf = { 2122 .head = { 2123 [0] = { 2124 .iov_base = page_address(ff_args->pages[0]), 2125 }, 2126 }, 2127 .buflen = PAGE_SIZE, 2128 }; 2129 struct xdr_stream tmp_xdr; 2130 __be32 *start; 2131 2132 dprintk("%s: Begin\n", __func__); 2133 2134 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL); 2135 2136 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2137 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2138 2139 start = xdr_reserve_space(xdr, 4); 2140 *start = cpu_to_be32(tmp_buf.len); 2141 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2142 2143 dprintk("%s: Return\n", __func__); 2144 } 2145 2146 static void 2147 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2148 { 2149 struct nfs4_flexfile_layoutreturn_args *ff_args; 2150 2151 if (!args->data) 2152 return; 2153 ff_args = args->data; 2154 args->data = NULL; 2155 2156 ff_layout_free_ds_ioerr(&ff_args->errors); 2157 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2158 2159 put_page(ff_args->pages[0]); 2160 kfree(ff_args); 2161 } 2162 2163 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2164 .encode = ff_layout_encode_layoutreturn, 2165 .free = ff_layout_free_layoutreturn, 2166 }; 2167 2168 static int 2169 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2170 { 2171 struct nfs4_flexfile_layoutreturn_args *ff_args; 2172 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2173 2174 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL); 2175 if (!ff_args) 2176 goto out_nomem; 2177 ff_args->pages[0] = alloc_page(GFP_KERNEL); 2178 if (!ff_args->pages[0]) 2179 goto out_nomem_free; 2180 2181 INIT_LIST_HEAD(&ff_args->errors); 2182 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2183 &args->range, &ff_args->errors, 2184 FF_LAYOUTRETURN_MAXERR); 2185 2186 spin_lock(&args->inode->i_lock); 2187 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2188 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo)); 2189 spin_unlock(&args->inode->i_lock); 2190 2191 args->ld_private->ops = &layoutreturn_ops; 2192 args->ld_private->data = ff_args; 2193 return 0; 2194 out_nomem_free: 2195 kfree(ff_args); 2196 out_nomem: 2197 return -ENOMEM; 2198 } 2199 2200 #ifdef CONFIG_NFS_V4_2 2201 void 2202 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2203 { 2204 struct pnfs_layout_hdr *lo = lseg->pls_layout; 2205 struct nfs42_layout_error *errors; 2206 LIST_HEAD(head); 2207 2208 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) 2209 return; 2210 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); 2211 if (list_empty(&head)) 2212 return; 2213 2214 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, 2215 sizeof(*errors), GFP_NOFS); 2216 if (errors != NULL) { 2217 const struct nfs4_ff_layout_ds_err *pos; 2218 size_t n = 0; 2219 2220 list_for_each_entry(pos, &head, list) { 2221 errors[n].offset = pos->offset; 2222 errors[n].length = pos->length; 2223 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); 2224 errors[n].errors[0].dev_id = pos->deviceid; 2225 errors[n].errors[0].status = pos->status; 2226 errors[n].errors[0].opnum = pos->opnum; 2227 n++; 2228 if (!list_is_last(&pos->list, &head) && 2229 n < NFS42_LAYOUTERROR_MAX) 2230 continue; 2231 if (nfs42_proc_layouterror(lseg, errors, n) < 0) 2232 break; 2233 n = 0; 2234 } 2235 kfree(errors); 2236 } 2237 ff_layout_free_ds_ioerr(&head); 2238 } 2239 #else 2240 void 2241 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2242 { 2243 } 2244 #endif 2245 2246 static int 2247 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2248 { 2249 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2250 2251 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2252 } 2253 2254 static size_t 2255 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2256 const int buflen) 2257 { 2258 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2259 const struct in6_addr *addr = &sin6->sin6_addr; 2260 2261 /* 2262 * RFC 4291, Section 2.2.2 2263 * 2264 * Shorthanded ANY address 2265 */ 2266 if (ipv6_addr_any(addr)) 2267 return snprintf(buf, buflen, "::"); 2268 2269 /* 2270 * RFC 4291, Section 2.2.2 2271 * 2272 * Shorthanded loopback address 2273 */ 2274 if (ipv6_addr_loopback(addr)) 2275 return snprintf(buf, buflen, "::1"); 2276 2277 /* 2278 * RFC 4291, Section 2.2.3 2279 * 2280 * Special presentation address format for mapped v4 2281 * addresses. 2282 */ 2283 if (ipv6_addr_v4mapped(addr)) 2284 return snprintf(buf, buflen, "::ffff:%pI4", 2285 &addr->s6_addr32[3]); 2286 2287 /* 2288 * RFC 4291, Section 2.2.1 2289 */ 2290 return snprintf(buf, buflen, "%pI6c", addr); 2291 } 2292 2293 /* Derived from rpc_sockaddr2uaddr */ 2294 static void 2295 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2296 { 2297 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2298 char portbuf[RPCBIND_MAXUADDRPLEN]; 2299 char addrbuf[RPCBIND_MAXUADDRLEN]; 2300 char *netid; 2301 unsigned short port; 2302 int len, netid_len; 2303 __be32 *p; 2304 2305 switch (sap->sa_family) { 2306 case AF_INET: 2307 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2308 return; 2309 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2310 netid = "tcp"; 2311 netid_len = 3; 2312 break; 2313 case AF_INET6: 2314 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2315 return; 2316 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2317 netid = "tcp6"; 2318 netid_len = 4; 2319 break; 2320 default: 2321 /* we only support tcp and tcp6 */ 2322 WARN_ON_ONCE(1); 2323 return; 2324 } 2325 2326 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2327 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2328 2329 p = xdr_reserve_space(xdr, 4 + netid_len); 2330 xdr_encode_opaque(p, netid, netid_len); 2331 2332 p = xdr_reserve_space(xdr, 4 + len); 2333 xdr_encode_opaque(p, addrbuf, len); 2334 } 2335 2336 static void 2337 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2338 ktime_t t) 2339 { 2340 struct timespec64 ts; 2341 __be32 *p; 2342 2343 p = xdr_reserve_space(xdr, 12); 2344 ts = ktime_to_timespec64(t); 2345 p = xdr_encode_hyper(p, ts.tv_sec); 2346 *p++ = cpu_to_be32(ts.tv_nsec); 2347 } 2348 2349 static void 2350 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2351 struct nfs4_ff_io_stat *stat) 2352 { 2353 __be32 *p; 2354 2355 p = xdr_reserve_space(xdr, 5 * 8); 2356 p = xdr_encode_hyper(p, stat->ops_requested); 2357 p = xdr_encode_hyper(p, stat->bytes_requested); 2358 p = xdr_encode_hyper(p, stat->ops_completed); 2359 p = xdr_encode_hyper(p, stat->bytes_completed); 2360 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2361 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2362 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2363 } 2364 2365 static void 2366 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2367 const struct nfs42_layoutstat_devinfo *devinfo, 2368 struct nfs4_ff_layout_mirror *mirror) 2369 { 2370 struct nfs4_pnfs_ds_addr *da; 2371 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds; 2372 struct nfs_fh *fh = &mirror->fh_versions[0]; 2373 __be32 *p; 2374 2375 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2376 dprintk("%s: DS %s: encoding address %s\n", 2377 __func__, ds->ds_remotestr, da->da_remotestr); 2378 /* netaddr4 */ 2379 ff_layout_encode_netaddr(xdr, da); 2380 /* nfs_fh4 */ 2381 p = xdr_reserve_space(xdr, 4 + fh->size); 2382 xdr_encode_opaque(p, fh->data, fh->size); 2383 /* ff_io_latency4 read */ 2384 spin_lock(&mirror->lock); 2385 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat); 2386 /* ff_io_latency4 write */ 2387 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat); 2388 spin_unlock(&mirror->lock); 2389 /* nfstime4 */ 2390 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time)); 2391 /* bool */ 2392 p = xdr_reserve_space(xdr, 4); 2393 *p = cpu_to_be32(false); 2394 } 2395 2396 static void 2397 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2398 const struct nfs4_xdr_opaque_data *opaque) 2399 { 2400 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2401 struct nfs42_layoutstat_devinfo, ld_private); 2402 __be32 *start; 2403 2404 /* layoutupdate length */ 2405 start = xdr_reserve_space(xdr, 4); 2406 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2407 2408 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2409 } 2410 2411 static void 2412 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2413 { 2414 struct nfs4_ff_layout_mirror *mirror = opaque->data; 2415 2416 ff_layout_put_mirror(mirror); 2417 } 2418 2419 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2420 .encode = ff_layout_encode_layoutstats, 2421 .free = ff_layout_free_layoutstats, 2422 }; 2423 2424 static int 2425 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2426 struct nfs42_layoutstat_devinfo *devinfo, 2427 int dev_limit) 2428 { 2429 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2430 struct nfs4_ff_layout_mirror *mirror; 2431 struct nfs4_deviceid_node *dev; 2432 int i = 0; 2433 2434 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2435 if (i >= dev_limit) 2436 break; 2437 if (IS_ERR_OR_NULL(mirror->mirror_ds)) 2438 continue; 2439 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags)) 2440 continue; 2441 /* mirror refcount put in cleanup_layoutstats */ 2442 if (!refcount_inc_not_zero(&mirror->ref)) 2443 continue; 2444 dev = &mirror->mirror_ds->id_node; 2445 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE); 2446 devinfo->offset = 0; 2447 devinfo->length = NFS4_MAX_UINT64; 2448 spin_lock(&mirror->lock); 2449 devinfo->read_count = mirror->read_stat.io_stat.ops_completed; 2450 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed; 2451 devinfo->write_count = mirror->write_stat.io_stat.ops_completed; 2452 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed; 2453 spin_unlock(&mirror->lock); 2454 devinfo->layout_type = LAYOUT_FLEX_FILES; 2455 devinfo->ld_private.ops = &layoutstat_ops; 2456 devinfo->ld_private.data = mirror; 2457 2458 devinfo++; 2459 i++; 2460 } 2461 return i; 2462 } 2463 2464 static int 2465 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2466 { 2467 struct nfs4_flexfile_layout *ff_layout; 2468 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2469 2470 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2471 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO); 2472 if (!args->devinfo) 2473 return -ENOMEM; 2474 2475 spin_lock(&args->inode->i_lock); 2476 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout); 2477 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2478 &args->devinfo[0], dev_count); 2479 spin_unlock(&args->inode->i_lock); 2480 if (!args->num_dev) { 2481 kfree(args->devinfo); 2482 args->devinfo = NULL; 2483 return -ENOENT; 2484 } 2485 2486 return 0; 2487 } 2488 2489 static int 2490 ff_layout_set_layoutdriver(struct nfs_server *server, 2491 const struct nfs_fh *dummy) 2492 { 2493 #if IS_ENABLED(CONFIG_NFS_V4_2) 2494 server->caps |= NFS_CAP_LAYOUTSTATS; 2495 #endif 2496 return 0; 2497 } 2498 2499 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2500 .id = LAYOUT_FLEX_FILES, 2501 .name = "LAYOUT_FLEX_FILES", 2502 .owner = THIS_MODULE, 2503 .flags = PNFS_LAYOUTGET_ON_OPEN, 2504 .max_layoutget_response = 4096, /* 1 page or so... */ 2505 .set_layoutdriver = ff_layout_set_layoutdriver, 2506 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2507 .free_layout_hdr = ff_layout_free_layout_hdr, 2508 .alloc_lseg = ff_layout_alloc_lseg, 2509 .free_lseg = ff_layout_free_lseg, 2510 .add_lseg = ff_layout_add_lseg, 2511 .pg_read_ops = &ff_layout_pg_read_ops, 2512 .pg_write_ops = &ff_layout_pg_write_ops, 2513 .get_ds_info = ff_layout_get_ds_info, 2514 .free_deviceid_node = ff_layout_free_deviceid_node, 2515 .mark_request_commit = pnfs_layout_mark_request_commit, 2516 .clear_request_commit = pnfs_generic_clear_request_commit, 2517 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2518 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2519 .commit_pagelist = ff_layout_commit_pagelist, 2520 .read_pagelist = ff_layout_read_pagelist, 2521 .write_pagelist = ff_layout_write_pagelist, 2522 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 2523 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 2524 .sync = pnfs_nfs_generic_sync, 2525 .prepare_layoutstats = ff_layout_prepare_layoutstats, 2526 }; 2527 2528 static int __init nfs4flexfilelayout_init(void) 2529 { 2530 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 2531 __func__); 2532 return pnfs_register_layoutdriver(&flexfilelayout_type); 2533 } 2534 2535 static void __exit nfs4flexfilelayout_exit(void) 2536 { 2537 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 2538 __func__); 2539 pnfs_unregister_layoutdriver(&flexfilelayout_type); 2540 } 2541 2542 MODULE_ALIAS("nfs-layouttype4-4"); 2543 2544 MODULE_LICENSE("GPL"); 2545 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 2546 2547 module_init(nfs4flexfilelayout_init); 2548 module_exit(nfs4flexfilelayout_exit); 2549 2550 module_param(io_maxretrans, ushort, 0644); 2551 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client " 2552 "retries an I/O request before returning an error. "); 2553