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_page.h> 12 #include <linux/module.h> 13 #include <linux/sched/mm.h> 14 15 #include <linux/sunrpc/metrics.h> 16 17 #include "flexfilelayout.h" 18 #include "../nfs4session.h" 19 #include "../nfs4idmap.h" 20 #include "../internal.h" 21 #include "../delegation.h" 22 #include "../nfs4trace.h" 23 #include "../iostat.h" 24 #include "../nfs.h" 25 #include "../nfs42.h" 26 27 #define NFSDBG_FACILITY NFSDBG_PNFS_LD 28 29 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ) 30 #define FF_LAYOUTRETURN_MAXERR 20 31 32 static unsigned short io_maxretrans; 33 34 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 35 struct nfs_pgio_header *hdr); 36 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 37 struct nfs42_layoutstat_devinfo *devinfo, 38 int dev_limit); 39 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 40 const struct nfs42_layoutstat_devinfo *devinfo, 41 struct nfs4_ff_layout_mirror *mirror); 42 43 static struct pnfs_layout_hdr * 44 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 45 { 46 struct nfs4_flexfile_layout *ffl; 47 48 ffl = kzalloc(sizeof(*ffl), gfp_flags); 49 if (ffl) { 50 INIT_LIST_HEAD(&ffl->error_list); 51 INIT_LIST_HEAD(&ffl->mirrors); 52 ffl->last_report_time = ktime_get(); 53 return &ffl->generic_hdr; 54 } else 55 return NULL; 56 } 57 58 static void 59 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo) 60 { 61 struct nfs4_ff_layout_ds_err *err, *n; 62 63 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list, 64 list) { 65 list_del(&err->list); 66 kfree(err); 67 } 68 kfree(FF_LAYOUT_FROM_HDR(lo)); 69 } 70 71 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 72 { 73 __be32 *p; 74 75 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 76 if (unlikely(p == NULL)) 77 return -ENOBUFS; 78 stateid->type = NFS4_PNFS_DS_STATEID_TYPE; 79 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 80 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__, 81 p[0], p[1], p[2], p[3]); 82 return 0; 83 } 84 85 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid) 86 { 87 __be32 *p; 88 89 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE); 90 if (unlikely(!p)) 91 return -ENOBUFS; 92 memcpy(devid, p, NFS4_DEVICEID4_SIZE); 93 nfs4_print_deviceid(devid); 94 return 0; 95 } 96 97 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 98 { 99 __be32 *p; 100 101 p = xdr_inline_decode(xdr, 4); 102 if (unlikely(!p)) 103 return -ENOBUFS; 104 fh->size = be32_to_cpup(p++); 105 if (fh->size > sizeof(struct nfs_fh)) { 106 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n", 107 fh->size); 108 return -EOVERFLOW; 109 } 110 /* fh.data */ 111 p = xdr_inline_decode(xdr, fh->size); 112 if (unlikely(!p)) 113 return -ENOBUFS; 114 memcpy(&fh->data, p, fh->size); 115 dprintk("%s: fh len %d\n", __func__, fh->size); 116 117 return 0; 118 } 119 120 /* 121 * Currently only stringified uids and gids are accepted. 122 * I.e., kerberos is not supported to the DSes, so no pricipals. 123 * 124 * That means that one common function will suffice, but when 125 * principals are added, this should be split to accomodate 126 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid(). 127 */ 128 static int 129 decode_name(struct xdr_stream *xdr, u32 *id) 130 { 131 __be32 *p; 132 int len; 133 134 /* opaque_length(4)*/ 135 p = xdr_inline_decode(xdr, 4); 136 if (unlikely(!p)) 137 return -ENOBUFS; 138 len = be32_to_cpup(p++); 139 if (len < 0) 140 return -EINVAL; 141 142 dprintk("%s: len %u\n", __func__, len); 143 144 /* opaque body */ 145 p = xdr_inline_decode(xdr, len); 146 if (unlikely(!p)) 147 return -ENOBUFS; 148 149 if (!nfs_map_string_to_numeric((char *)p, len, id)) 150 return -EINVAL; 151 152 return 0; 153 } 154 155 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1, 156 const struct nfs4_ff_layout_mirror *m2) 157 { 158 int i, j; 159 160 if (m1->fh_versions_cnt != m2->fh_versions_cnt) 161 return false; 162 for (i = 0; i < m1->fh_versions_cnt; i++) { 163 bool found_fh = false; 164 for (j = 0; j < m2->fh_versions_cnt; j++) { 165 if (nfs_compare_fh(&m1->fh_versions[i], 166 &m2->fh_versions[j]) == 0) { 167 found_fh = true; 168 break; 169 } 170 } 171 if (!found_fh) 172 return false; 173 } 174 return true; 175 } 176 177 static struct nfs4_ff_layout_mirror * 178 ff_layout_add_mirror(struct pnfs_layout_hdr *lo, 179 struct nfs4_ff_layout_mirror *mirror) 180 { 181 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 182 struct nfs4_ff_layout_mirror *pos; 183 struct inode *inode = lo->plh_inode; 184 185 spin_lock(&inode->i_lock); 186 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) { 187 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0) 188 continue; 189 if (!ff_mirror_match_fh(mirror, pos)) 190 continue; 191 if (refcount_inc_not_zero(&pos->ref)) { 192 spin_unlock(&inode->i_lock); 193 return pos; 194 } 195 } 196 list_add(&mirror->mirrors, &ff_layout->mirrors); 197 mirror->layout = lo; 198 spin_unlock(&inode->i_lock); 199 return mirror; 200 } 201 202 static void 203 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror) 204 { 205 struct inode *inode; 206 if (mirror->layout == NULL) 207 return; 208 inode = mirror->layout->plh_inode; 209 spin_lock(&inode->i_lock); 210 list_del(&mirror->mirrors); 211 spin_unlock(&inode->i_lock); 212 mirror->layout = NULL; 213 } 214 215 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags) 216 { 217 struct nfs4_ff_layout_mirror *mirror; 218 219 mirror = kzalloc(sizeof(*mirror), gfp_flags); 220 if (mirror != NULL) { 221 spin_lock_init(&mirror->lock); 222 refcount_set(&mirror->ref, 1); 223 INIT_LIST_HEAD(&mirror->mirrors); 224 } 225 return mirror; 226 } 227 228 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror) 229 { 230 const struct cred *cred; 231 232 ff_layout_remove_mirror(mirror); 233 kfree(mirror->fh_versions); 234 cred = rcu_access_pointer(mirror->ro_cred); 235 put_cred(cred); 236 cred = rcu_access_pointer(mirror->rw_cred); 237 put_cred(cred); 238 nfs4_ff_layout_put_deviceid(mirror->mirror_ds); 239 kfree(mirror); 240 } 241 242 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror) 243 { 244 if (mirror != NULL && refcount_dec_and_test(&mirror->ref)) 245 ff_layout_free_mirror(mirror); 246 } 247 248 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls) 249 { 250 int i; 251 252 if (fls->mirror_array) { 253 for (i = 0; i < fls->mirror_array_cnt; i++) { 254 /* normally mirror_ds is freed in 255 * .free_deviceid_node but we still do it here 256 * for .alloc_lseg error path */ 257 ff_layout_put_mirror(fls->mirror_array[i]); 258 } 259 kfree(fls->mirror_array); 260 fls->mirror_array = NULL; 261 } 262 } 263 264 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr) 265 { 266 int ret = 0; 267 268 dprintk("--> %s\n", __func__); 269 270 /* FIXME: remove this check when layout segment support is added */ 271 if (lgr->range.offset != 0 || 272 lgr->range.length != NFS4_MAX_UINT64) { 273 dprintk("%s Only whole file layouts supported. Use MDS i/o\n", 274 __func__); 275 ret = -EINVAL; 276 } 277 278 dprintk("--> %s returns %d\n", __func__, ret); 279 return ret; 280 } 281 282 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls) 283 { 284 if (fls) { 285 ff_layout_free_mirror_array(fls); 286 kfree(fls); 287 } 288 } 289 290 static bool 291 ff_lseg_range_is_after(const struct pnfs_layout_range *l1, 292 const struct pnfs_layout_range *l2) 293 { 294 u64 end1, end2; 295 296 if (l1->iomode != l2->iomode) 297 return l1->iomode != IOMODE_READ; 298 end1 = pnfs_calc_offset_end(l1->offset, l1->length); 299 end2 = pnfs_calc_offset_end(l2->offset, l2->length); 300 if (end1 < l2->offset) 301 return false; 302 if (end2 < l1->offset) 303 return true; 304 return l2->offset <= l1->offset; 305 } 306 307 static bool 308 ff_lseg_merge(struct pnfs_layout_segment *new, 309 struct pnfs_layout_segment *old) 310 { 311 u64 new_end, old_end; 312 313 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags)) 314 return false; 315 if (new->pls_range.iomode != old->pls_range.iomode) 316 return false; 317 old_end = pnfs_calc_offset_end(old->pls_range.offset, 318 old->pls_range.length); 319 if (old_end < new->pls_range.offset) 320 return false; 321 new_end = pnfs_calc_offset_end(new->pls_range.offset, 322 new->pls_range.length); 323 if (new_end < old->pls_range.offset) 324 return false; 325 326 /* Mergeable: copy info from 'old' to 'new' */ 327 if (new_end < old_end) 328 new_end = old_end; 329 if (new->pls_range.offset < old->pls_range.offset) 330 new->pls_range.offset = old->pls_range.offset; 331 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset, 332 new_end); 333 if (test_bit(NFS_LSEG_ROC, &old->pls_flags)) 334 set_bit(NFS_LSEG_ROC, &new->pls_flags); 335 return true; 336 } 337 338 static void 339 ff_layout_add_lseg(struct pnfs_layout_hdr *lo, 340 struct pnfs_layout_segment *lseg, 341 struct list_head *free_me) 342 { 343 pnfs_generic_layout_insert_lseg(lo, lseg, 344 ff_lseg_range_is_after, 345 ff_lseg_merge, 346 free_me); 347 } 348 349 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls) 350 { 351 int i, j; 352 353 for (i = 0; i < fls->mirror_array_cnt - 1; i++) { 354 for (j = i + 1; j < fls->mirror_array_cnt; j++) 355 if (fls->mirror_array[i]->efficiency < 356 fls->mirror_array[j]->efficiency) 357 swap(fls->mirror_array[i], 358 fls->mirror_array[j]); 359 } 360 } 361 362 static struct pnfs_layout_segment * 363 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh, 364 struct nfs4_layoutget_res *lgr, 365 gfp_t gfp_flags) 366 { 367 struct pnfs_layout_segment *ret; 368 struct nfs4_ff_layout_segment *fls = NULL; 369 struct xdr_stream stream; 370 struct xdr_buf buf; 371 struct page *scratch; 372 u64 stripe_unit; 373 u32 mirror_array_cnt; 374 __be32 *p; 375 int i, rc; 376 377 dprintk("--> %s\n", __func__); 378 scratch = alloc_page(gfp_flags); 379 if (!scratch) 380 return ERR_PTR(-ENOMEM); 381 382 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, 383 lgr->layoutp->len); 384 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 385 386 /* stripe unit and mirror_array_cnt */ 387 rc = -EIO; 388 p = xdr_inline_decode(&stream, 8 + 4); 389 if (!p) 390 goto out_err_free; 391 392 p = xdr_decode_hyper(p, &stripe_unit); 393 mirror_array_cnt = be32_to_cpup(p++); 394 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__, 395 stripe_unit, mirror_array_cnt); 396 397 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT || 398 mirror_array_cnt == 0) 399 goto out_err_free; 400 401 rc = -ENOMEM; 402 fls = kzalloc(sizeof(*fls), gfp_flags); 403 if (!fls) 404 goto out_err_free; 405 406 fls->mirror_array_cnt = mirror_array_cnt; 407 fls->stripe_unit = stripe_unit; 408 fls->mirror_array = kcalloc(fls->mirror_array_cnt, 409 sizeof(fls->mirror_array[0]), gfp_flags); 410 if (fls->mirror_array == NULL) 411 goto out_err_free; 412 413 for (i = 0; i < fls->mirror_array_cnt; i++) { 414 struct nfs4_ff_layout_mirror *mirror; 415 struct cred *kcred; 416 const struct cred __rcu *cred; 417 kuid_t uid; 418 kgid_t gid; 419 u32 ds_count, fh_count, id; 420 int j; 421 422 rc = -EIO; 423 p = xdr_inline_decode(&stream, 4); 424 if (!p) 425 goto out_err_free; 426 ds_count = be32_to_cpup(p); 427 428 /* FIXME: allow for striping? */ 429 if (ds_count != 1) 430 goto out_err_free; 431 432 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags); 433 if (fls->mirror_array[i] == NULL) { 434 rc = -ENOMEM; 435 goto out_err_free; 436 } 437 438 fls->mirror_array[i]->ds_count = ds_count; 439 440 /* deviceid */ 441 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid); 442 if (rc) 443 goto out_err_free; 444 445 /* efficiency */ 446 rc = -EIO; 447 p = xdr_inline_decode(&stream, 4); 448 if (!p) 449 goto out_err_free; 450 fls->mirror_array[i]->efficiency = be32_to_cpup(p); 451 452 /* stateid */ 453 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid); 454 if (rc) 455 goto out_err_free; 456 457 /* fh */ 458 rc = -EIO; 459 p = xdr_inline_decode(&stream, 4); 460 if (!p) 461 goto out_err_free; 462 fh_count = be32_to_cpup(p); 463 464 fls->mirror_array[i]->fh_versions = 465 kcalloc(fh_count, sizeof(struct nfs_fh), 466 gfp_flags); 467 if (fls->mirror_array[i]->fh_versions == NULL) { 468 rc = -ENOMEM; 469 goto out_err_free; 470 } 471 472 for (j = 0; j < fh_count; j++) { 473 rc = decode_nfs_fh(&stream, 474 &fls->mirror_array[i]->fh_versions[j]); 475 if (rc) 476 goto out_err_free; 477 } 478 479 fls->mirror_array[i]->fh_versions_cnt = fh_count; 480 481 /* user */ 482 rc = decode_name(&stream, &id); 483 if (rc) 484 goto out_err_free; 485 486 uid = make_kuid(&init_user_ns, id); 487 488 /* group */ 489 rc = decode_name(&stream, &id); 490 if (rc) 491 goto out_err_free; 492 493 gid = make_kgid(&init_user_ns, id); 494 495 if (gfp_flags & __GFP_FS) 496 kcred = prepare_kernel_cred(NULL); 497 else { 498 unsigned int nofs_flags = memalloc_nofs_save(); 499 kcred = prepare_kernel_cred(NULL); 500 memalloc_nofs_restore(nofs_flags); 501 } 502 rc = -ENOMEM; 503 if (!kcred) 504 goto out_err_free; 505 kcred->fsuid = uid; 506 kcred->fsgid = gid; 507 cred = RCU_INITIALIZER(kcred); 508 509 if (lgr->range.iomode == IOMODE_READ) 510 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 511 else 512 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 513 514 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]); 515 if (mirror != fls->mirror_array[i]) { 516 /* swap cred ptrs so free_mirror will clean up old */ 517 if (lgr->range.iomode == IOMODE_READ) { 518 cred = xchg(&mirror->ro_cred, cred); 519 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 520 } else { 521 cred = xchg(&mirror->rw_cred, cred); 522 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 523 } 524 ff_layout_free_mirror(fls->mirror_array[i]); 525 fls->mirror_array[i] = mirror; 526 } 527 528 dprintk("%s: iomode %s uid %u gid %u\n", __func__, 529 lgr->range.iomode == IOMODE_READ ? "READ" : "RW", 530 from_kuid(&init_user_ns, uid), 531 from_kgid(&init_user_ns, gid)); 532 } 533 534 p = xdr_inline_decode(&stream, 4); 535 if (!p) 536 goto out_sort_mirrors; 537 fls->flags = be32_to_cpup(p); 538 539 p = xdr_inline_decode(&stream, 4); 540 if (!p) 541 goto out_sort_mirrors; 542 for (i=0; i < fls->mirror_array_cnt; i++) 543 fls->mirror_array[i]->report_interval = be32_to_cpup(p); 544 545 out_sort_mirrors: 546 ff_layout_sort_mirrors(fls); 547 rc = ff_layout_check_layout(lgr); 548 if (rc) 549 goto out_err_free; 550 ret = &fls->generic_hdr; 551 dprintk("<-- %s (success)\n", __func__); 552 out_free_page: 553 __free_page(scratch); 554 return ret; 555 out_err_free: 556 _ff_layout_free_lseg(fls); 557 ret = ERR_PTR(rc); 558 dprintk("<-- %s (%d)\n", __func__, rc); 559 goto out_free_page; 560 } 561 562 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout) 563 { 564 struct pnfs_layout_segment *lseg; 565 566 list_for_each_entry(lseg, &layout->plh_segs, pls_list) 567 if (lseg->pls_range.iomode == IOMODE_RW) 568 return true; 569 570 return false; 571 } 572 573 static void 574 ff_layout_free_lseg(struct pnfs_layout_segment *lseg) 575 { 576 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 577 578 dprintk("--> %s\n", __func__); 579 580 if (lseg->pls_range.iomode == IOMODE_RW) { 581 struct nfs4_flexfile_layout *ffl; 582 struct inode *inode; 583 584 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout); 585 inode = ffl->generic_hdr.plh_inode; 586 spin_lock(&inode->i_lock); 587 if (!ff_layout_has_rw_segments(lseg->pls_layout)) { 588 ffl->commit_info.nbuckets = 0; 589 kfree(ffl->commit_info.buckets); 590 ffl->commit_info.buckets = NULL; 591 } 592 spin_unlock(&inode->i_lock); 593 } 594 _ff_layout_free_lseg(fls); 595 } 596 597 /* Return 1 until we have multiple lsegs support */ 598 static int 599 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls) 600 { 601 return 1; 602 } 603 604 static void 605 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 606 { 607 /* first IO request? */ 608 if (atomic_inc_return(&timer->n_ops) == 1) { 609 timer->start_time = now; 610 } 611 } 612 613 static ktime_t 614 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 615 { 616 ktime_t start; 617 618 if (atomic_dec_return(&timer->n_ops) < 0) 619 WARN_ON_ONCE(1); 620 621 start = timer->start_time; 622 timer->start_time = now; 623 return ktime_sub(now, start); 624 } 625 626 static bool 627 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 628 struct nfs4_ff_layoutstat *layoutstat, 629 ktime_t now) 630 { 631 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL; 632 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout); 633 634 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now); 635 if (!mirror->start_time) 636 mirror->start_time = now; 637 if (mirror->report_interval != 0) 638 report_interval = (s64)mirror->report_interval * 1000LL; 639 else if (layoutstats_timer != 0) 640 report_interval = (s64)layoutstats_timer * 1000LL; 641 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >= 642 report_interval) { 643 ffl->last_report_time = now; 644 return true; 645 } 646 647 return false; 648 } 649 650 static void 651 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat, 652 __u64 requested) 653 { 654 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 655 656 iostat->ops_requested++; 657 iostat->bytes_requested += requested; 658 } 659 660 static void 661 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat, 662 __u64 requested, 663 __u64 completed, 664 ktime_t time_completed, 665 ktime_t time_started) 666 { 667 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 668 ktime_t completion_time = ktime_sub(time_completed, time_started); 669 ktime_t timer; 670 671 iostat->ops_completed++; 672 iostat->bytes_completed += completed; 673 iostat->bytes_not_delivered += requested - completed; 674 675 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed); 676 iostat->total_busy_time = 677 ktime_add(iostat->total_busy_time, timer); 678 iostat->aggregate_completion_time = 679 ktime_add(iostat->aggregate_completion_time, 680 completion_time); 681 } 682 683 static void 684 nfs4_ff_layout_stat_io_start_read(struct inode *inode, 685 struct nfs4_ff_layout_mirror *mirror, 686 __u64 requested, ktime_t now) 687 { 688 bool report; 689 690 spin_lock(&mirror->lock); 691 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now); 692 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested); 693 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 694 spin_unlock(&mirror->lock); 695 696 if (report) 697 pnfs_report_layoutstat(inode, GFP_KERNEL); 698 } 699 700 static void 701 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task, 702 struct nfs4_ff_layout_mirror *mirror, 703 __u64 requested, 704 __u64 completed) 705 { 706 spin_lock(&mirror->lock); 707 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat, 708 requested, completed, 709 ktime_get(), task->tk_start); 710 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 711 spin_unlock(&mirror->lock); 712 } 713 714 static void 715 nfs4_ff_layout_stat_io_start_write(struct inode *inode, 716 struct nfs4_ff_layout_mirror *mirror, 717 __u64 requested, ktime_t now) 718 { 719 bool report; 720 721 spin_lock(&mirror->lock); 722 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now); 723 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested); 724 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 725 spin_unlock(&mirror->lock); 726 727 if (report) 728 pnfs_report_layoutstat(inode, GFP_NOIO); 729 } 730 731 static void 732 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, 733 struct nfs4_ff_layout_mirror *mirror, 734 __u64 requested, 735 __u64 completed, 736 enum nfs3_stable_how committed) 737 { 738 if (committed == NFS_UNSTABLE) 739 requested = completed = 0; 740 741 spin_lock(&mirror->lock); 742 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat, 743 requested, completed, ktime_get(), task->tk_start); 744 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 745 spin_unlock(&mirror->lock); 746 } 747 748 static int 749 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg, 750 struct nfs_commit_info *cinfo, 751 gfp_t gfp_flags) 752 { 753 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 754 struct pnfs_commit_bucket *buckets; 755 int size; 756 757 if (cinfo->ds->nbuckets != 0) { 758 /* This assumes there is only one RW lseg per file. 759 * To support multiple lseg per file, we need to 760 * change struct pnfs_commit_bucket to allow dynamic 761 * increasing nbuckets. 762 */ 763 return 0; 764 } 765 766 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg); 767 768 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket), 769 gfp_flags); 770 if (!buckets) 771 return -ENOMEM; 772 else { 773 int i; 774 775 spin_lock(&cinfo->inode->i_lock); 776 if (cinfo->ds->nbuckets != 0) 777 kfree(buckets); 778 else { 779 cinfo->ds->buckets = buckets; 780 cinfo->ds->nbuckets = size; 781 for (i = 0; i < size; i++) { 782 INIT_LIST_HEAD(&buckets[i].written); 783 INIT_LIST_HEAD(&buckets[i].committing); 784 /* mark direct verifier as unset */ 785 buckets[i].direct_verf.committed = 786 NFS_INVALID_STABLE_HOW; 787 } 788 } 789 spin_unlock(&cinfo->inode->i_lock); 790 return 0; 791 } 792 } 793 794 static void 795 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx) 796 { 797 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 798 799 if (devid) 800 nfs4_mark_deviceid_unavailable(devid); 801 } 802 803 static void 804 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx) 805 { 806 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 807 808 if (devid) 809 nfs4_mark_deviceid_available(devid); 810 } 811 812 static struct nfs4_pnfs_ds * 813 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, 814 int start_idx, int *best_idx, 815 bool check_device) 816 { 817 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 818 struct nfs4_ff_layout_mirror *mirror; 819 struct nfs4_pnfs_ds *ds; 820 bool fail_return = false; 821 int idx; 822 823 /* mirrors are initially sorted by efficiency */ 824 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 825 if (idx+1 == fls->mirror_array_cnt) 826 fail_return = !check_device; 827 828 mirror = FF_LAYOUT_COMP(lseg, idx); 829 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return); 830 if (!ds) 831 continue; 832 833 if (check_device && 834 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node)) 835 continue; 836 837 *best_idx = idx; 838 return ds; 839 } 840 841 return NULL; 842 } 843 844 static struct nfs4_pnfs_ds * 845 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg, 846 int start_idx, int *best_idx) 847 { 848 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false); 849 } 850 851 static struct nfs4_pnfs_ds * 852 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg, 853 int start_idx, int *best_idx) 854 { 855 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true); 856 } 857 858 static struct nfs4_pnfs_ds * 859 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 860 int start_idx, int *best_idx) 861 { 862 struct nfs4_pnfs_ds *ds; 863 864 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx); 865 if (ds) 866 return ds; 867 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx); 868 } 869 870 static void 871 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio, 872 struct nfs_page *req, 873 bool strict_iomode) 874 { 875 pnfs_put_lseg(pgio->pg_lseg); 876 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 877 nfs_req_openctx(req), 878 0, 879 NFS4_MAX_UINT64, 880 IOMODE_READ, 881 strict_iomode, 882 GFP_KERNEL); 883 if (IS_ERR(pgio->pg_lseg)) { 884 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 885 pgio->pg_lseg = NULL; 886 } 887 } 888 889 static void 890 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 891 struct nfs_page *req) 892 { 893 struct nfs_pgio_mirror *pgm; 894 struct nfs4_ff_layout_mirror *mirror; 895 struct nfs4_pnfs_ds *ds; 896 int ds_idx; 897 898 retry: 899 pnfs_generic_pg_check_layout(pgio); 900 /* Use full layout for now */ 901 if (!pgio->pg_lseg) { 902 ff_layout_pg_get_read(pgio, req, false); 903 if (!pgio->pg_lseg) 904 goto out_nolseg; 905 } 906 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 907 ff_layout_pg_get_read(pgio, req, true); 908 if (!pgio->pg_lseg) 909 goto out_nolseg; 910 } 911 912 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx); 913 if (!ds) { 914 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 915 goto out_mds; 916 pnfs_put_lseg(pgio->pg_lseg); 917 pgio->pg_lseg = NULL; 918 /* Sleep for 1 second before retrying */ 919 ssleep(1); 920 goto retry; 921 } 922 923 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 924 925 pgio->pg_mirror_idx = ds_idx; 926 927 /* read always uses only one mirror - idx 0 for pgio layer */ 928 pgm = &pgio->pg_mirrors[0]; 929 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; 930 931 pgio->pg_maxretrans = io_maxretrans; 932 return; 933 out_nolseg: 934 if (pgio->pg_error < 0) 935 return; 936 out_mds: 937 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode, 938 0, NFS4_MAX_UINT64, IOMODE_READ, 939 NFS_I(pgio->pg_inode)->layout, 940 pgio->pg_lseg); 941 pnfs_put_lseg(pgio->pg_lseg); 942 pgio->pg_lseg = NULL; 943 nfs_pageio_reset_read_mds(pgio); 944 } 945 946 static void 947 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 948 struct nfs_page *req) 949 { 950 struct nfs4_ff_layout_mirror *mirror; 951 struct nfs_pgio_mirror *pgm; 952 struct nfs_commit_info cinfo; 953 struct nfs4_pnfs_ds *ds; 954 int i; 955 int status; 956 957 retry: 958 pnfs_generic_pg_check_layout(pgio); 959 if (!pgio->pg_lseg) { 960 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 961 nfs_req_openctx(req), 962 0, 963 NFS4_MAX_UINT64, 964 IOMODE_RW, 965 false, 966 GFP_NOFS); 967 if (IS_ERR(pgio->pg_lseg)) { 968 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 969 pgio->pg_lseg = NULL; 970 return; 971 } 972 } 973 /* If no lseg, fall back to write through mds */ 974 if (pgio->pg_lseg == NULL) 975 goto out_mds; 976 977 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq); 978 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS); 979 if (status < 0) 980 goto out_mds; 981 982 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 983 if (WARN_ON_ONCE(pgio->pg_mirror_count != 984 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))) 985 goto out_mds; 986 987 for (i = 0; i < pgio->pg_mirror_count; i++) { 988 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 989 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true); 990 if (!ds) { 991 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 992 goto out_mds; 993 pnfs_put_lseg(pgio->pg_lseg); 994 pgio->pg_lseg = NULL; 995 /* Sleep for 1 second before retrying */ 996 ssleep(1); 997 goto retry; 998 } 999 pgm = &pgio->pg_mirrors[i]; 1000 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize; 1001 } 1002 1003 pgio->pg_maxretrans = io_maxretrans; 1004 return; 1005 1006 out_mds: 1007 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode, 1008 0, NFS4_MAX_UINT64, IOMODE_RW, 1009 NFS_I(pgio->pg_inode)->layout, 1010 pgio->pg_lseg); 1011 pnfs_put_lseg(pgio->pg_lseg); 1012 pgio->pg_lseg = NULL; 1013 nfs_pageio_reset_write_mds(pgio); 1014 } 1015 1016 static unsigned int 1017 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 1018 struct nfs_page *req) 1019 { 1020 if (!pgio->pg_lseg) { 1021 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 1022 nfs_req_openctx(req), 1023 0, 1024 NFS4_MAX_UINT64, 1025 IOMODE_RW, 1026 false, 1027 GFP_NOFS); 1028 if (IS_ERR(pgio->pg_lseg)) { 1029 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 1030 pgio->pg_lseg = NULL; 1031 goto out; 1032 } 1033 } 1034 if (pgio->pg_lseg) 1035 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 1036 1037 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode, 1038 0, NFS4_MAX_UINT64, IOMODE_RW, 1039 NFS_I(pgio->pg_inode)->layout, 1040 pgio->pg_lseg); 1041 /* no lseg means that pnfs is not in use, so no mirroring here */ 1042 nfs_pageio_reset_write_mds(pgio); 1043 out: 1044 return 1; 1045 } 1046 1047 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 1048 .pg_init = ff_layout_pg_init_read, 1049 .pg_test = pnfs_generic_pg_test, 1050 .pg_doio = pnfs_generic_pg_readpages, 1051 .pg_cleanup = pnfs_generic_pg_cleanup, 1052 }; 1053 1054 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 1055 .pg_init = ff_layout_pg_init_write, 1056 .pg_test = pnfs_generic_pg_test, 1057 .pg_doio = pnfs_generic_pg_writepages, 1058 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 1059 .pg_cleanup = pnfs_generic_pg_cleanup, 1060 }; 1061 1062 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 1063 { 1064 struct rpc_task *task = &hdr->task; 1065 1066 pnfs_layoutcommit_inode(hdr->inode, false); 1067 1068 if (retry_pnfs) { 1069 dprintk("%s Reset task %5u for i/o through pNFS " 1070 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1071 hdr->task.tk_pid, 1072 hdr->inode->i_sb->s_id, 1073 (unsigned long long)NFS_FILEID(hdr->inode), 1074 hdr->args.count, 1075 (unsigned long long)hdr->args.offset); 1076 1077 hdr->completion_ops->reschedule_io(hdr); 1078 return; 1079 } 1080 1081 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1082 dprintk("%s Reset task %5u for i/o through MDS " 1083 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1084 hdr->task.tk_pid, 1085 hdr->inode->i_sb->s_id, 1086 (unsigned long long)NFS_FILEID(hdr->inode), 1087 hdr->args.count, 1088 (unsigned long long)hdr->args.offset); 1089 1090 trace_pnfs_mds_fallback_write_done(hdr->inode, 1091 hdr->args.offset, hdr->args.count, 1092 IOMODE_RW, NFS_I(hdr->inode)->layout, 1093 hdr->lseg); 1094 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1095 } 1096 } 1097 1098 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1099 { 1100 struct rpc_task *task = &hdr->task; 1101 1102 pnfs_layoutcommit_inode(hdr->inode, false); 1103 1104 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1105 dprintk("%s Reset task %5u for i/o through MDS " 1106 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1107 hdr->task.tk_pid, 1108 hdr->inode->i_sb->s_id, 1109 (unsigned long long)NFS_FILEID(hdr->inode), 1110 hdr->args.count, 1111 (unsigned long long)hdr->args.offset); 1112 1113 trace_pnfs_mds_fallback_read_done(hdr->inode, 1114 hdr->args.offset, hdr->args.count, 1115 IOMODE_READ, NFS_I(hdr->inode)->layout, 1116 hdr->lseg); 1117 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1118 } 1119 } 1120 1121 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1122 struct nfs4_state *state, 1123 struct nfs_client *clp, 1124 struct pnfs_layout_segment *lseg, 1125 int idx) 1126 { 1127 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1128 struct inode *inode = lo->plh_inode; 1129 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1130 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1131 1132 switch (task->tk_status) { 1133 case -NFS4ERR_BADSESSION: 1134 case -NFS4ERR_BADSLOT: 1135 case -NFS4ERR_BAD_HIGH_SLOT: 1136 case -NFS4ERR_DEADSESSION: 1137 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1138 case -NFS4ERR_SEQ_FALSE_RETRY: 1139 case -NFS4ERR_SEQ_MISORDERED: 1140 dprintk("%s ERROR %d, Reset session. Exchangeid " 1141 "flags 0x%x\n", __func__, task->tk_status, 1142 clp->cl_exchange_flags); 1143 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1144 break; 1145 case -NFS4ERR_DELAY: 1146 case -NFS4ERR_GRACE: 1147 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1148 break; 1149 case -NFS4ERR_RETRY_UNCACHED_REP: 1150 break; 1151 case -EAGAIN: 1152 return -NFS4ERR_RESET_TO_PNFS; 1153 /* Invalidate Layout errors */ 1154 case -NFS4ERR_PNFS_NO_LAYOUT: 1155 case -ESTALE: /* mapped NFS4ERR_STALE */ 1156 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 1157 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 1158 case -NFS4ERR_FHEXPIRED: 1159 case -NFS4ERR_WRONG_TYPE: 1160 dprintk("%s Invalid layout error %d\n", __func__, 1161 task->tk_status); 1162 /* 1163 * Destroy layout so new i/o will get a new layout. 1164 * Layout will not be destroyed until all current lseg 1165 * references are put. Mark layout as invalid to resend failed 1166 * i/o and all i/o waiting on the slot table to the MDS until 1167 * layout is destroyed and a new valid layout is obtained. 1168 */ 1169 pnfs_destroy_layout(NFS_I(inode)); 1170 rpc_wake_up(&tbl->slot_tbl_waitq); 1171 goto reset; 1172 /* RPC connection errors */ 1173 case -ECONNREFUSED: 1174 case -EHOSTDOWN: 1175 case -EHOSTUNREACH: 1176 case -ENETUNREACH: 1177 case -EIO: 1178 case -ETIMEDOUT: 1179 case -EPIPE: 1180 dprintk("%s DS connection error %d\n", __func__, 1181 task->tk_status); 1182 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1183 &devid->deviceid); 1184 rpc_wake_up(&tbl->slot_tbl_waitq); 1185 /* fall through */ 1186 default: 1187 if (ff_layout_avoid_mds_available_ds(lseg)) 1188 return -NFS4ERR_RESET_TO_PNFS; 1189 reset: 1190 dprintk("%s Retry through MDS. Error %d\n", __func__, 1191 task->tk_status); 1192 return -NFS4ERR_RESET_TO_MDS; 1193 } 1194 task->tk_status = 0; 1195 return -EAGAIN; 1196 } 1197 1198 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1199 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1200 struct pnfs_layout_segment *lseg, 1201 int idx) 1202 { 1203 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1204 1205 switch (task->tk_status) { 1206 /* File access problems. Don't mark the device as unavailable */ 1207 case -EACCES: 1208 case -ESTALE: 1209 case -EISDIR: 1210 case -EBADHANDLE: 1211 case -ELOOP: 1212 case -ENOSPC: 1213 case -EAGAIN: 1214 break; 1215 case -EJUKEBOX: 1216 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1217 goto out_retry; 1218 default: 1219 dprintk("%s DS connection error %d\n", __func__, 1220 task->tk_status); 1221 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1222 &devid->deviceid); 1223 } 1224 /* FIXME: Need to prevent infinite looping here. */ 1225 return -NFS4ERR_RESET_TO_PNFS; 1226 out_retry: 1227 task->tk_status = 0; 1228 rpc_restart_call_prepare(task); 1229 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1230 return -EAGAIN; 1231 } 1232 1233 static int ff_layout_async_handle_error(struct rpc_task *task, 1234 struct nfs4_state *state, 1235 struct nfs_client *clp, 1236 struct pnfs_layout_segment *lseg, 1237 int idx) 1238 { 1239 int vers = clp->cl_nfs_mod->rpc_vers->number; 1240 1241 if (task->tk_status >= 0) { 1242 ff_layout_mark_ds_reachable(lseg, idx); 1243 return 0; 1244 } 1245 1246 /* Handle the case of an invalid layout segment */ 1247 if (!pnfs_is_valid_lseg(lseg)) 1248 return -NFS4ERR_RESET_TO_PNFS; 1249 1250 switch (vers) { 1251 case 3: 1252 return ff_layout_async_handle_error_v3(task, lseg, idx); 1253 case 4: 1254 return ff_layout_async_handle_error_v4(task, state, clp, 1255 lseg, idx); 1256 default: 1257 /* should never happen */ 1258 WARN_ON_ONCE(1); 1259 return 0; 1260 } 1261 } 1262 1263 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1264 int idx, u64 offset, u64 length, 1265 u32 status, int opnum, int error) 1266 { 1267 struct nfs4_ff_layout_mirror *mirror; 1268 int err; 1269 1270 if (status == 0) { 1271 switch (error) { 1272 case -ETIMEDOUT: 1273 case -EPFNOSUPPORT: 1274 case -EPROTONOSUPPORT: 1275 case -EOPNOTSUPP: 1276 case -ECONNREFUSED: 1277 case -ECONNRESET: 1278 case -EHOSTDOWN: 1279 case -EHOSTUNREACH: 1280 case -ENETUNREACH: 1281 case -EADDRINUSE: 1282 case -ENOBUFS: 1283 case -EPIPE: 1284 case -EPERM: 1285 status = NFS4ERR_NXIO; 1286 break; 1287 case -EACCES: 1288 status = NFS4ERR_ACCESS; 1289 break; 1290 default: 1291 return; 1292 } 1293 } 1294 1295 switch (status) { 1296 case NFS4ERR_DELAY: 1297 case NFS4ERR_GRACE: 1298 return; 1299 default: 1300 break; 1301 } 1302 1303 mirror = FF_LAYOUT_COMP(lseg, idx); 1304 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1305 mirror, offset, length, status, opnum, 1306 GFP_NOIO); 1307 if (status == NFS4ERR_NXIO) 1308 ff_layout_mark_ds_unreachable(lseg, idx); 1309 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg); 1310 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1311 } 1312 1313 /* NFS_PROTO call done callback routines */ 1314 static int ff_layout_read_done_cb(struct rpc_task *task, 1315 struct nfs_pgio_header *hdr) 1316 { 1317 int new_idx = hdr->pgio_mirror_idx; 1318 int err; 1319 1320 trace_nfs4_pnfs_read(hdr, task->tk_status); 1321 if (task->tk_status < 0) 1322 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1323 hdr->args.offset, hdr->args.count, 1324 hdr->res.op_status, OP_READ, 1325 task->tk_status); 1326 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1327 hdr->ds_clp, hdr->lseg, 1328 hdr->pgio_mirror_idx); 1329 1330 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1331 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1332 switch (err) { 1333 case -NFS4ERR_RESET_TO_PNFS: 1334 if (ff_layout_choose_best_ds_for_read(hdr->lseg, 1335 hdr->pgio_mirror_idx + 1, 1336 &new_idx)) 1337 goto out_layouterror; 1338 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1339 return task->tk_status; 1340 case -NFS4ERR_RESET_TO_MDS: 1341 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1342 return task->tk_status; 1343 case -EAGAIN: 1344 goto out_eagain; 1345 } 1346 1347 return 0; 1348 out_layouterror: 1349 ff_layout_read_record_layoutstats_done(task, hdr); 1350 ff_layout_send_layouterror(hdr->lseg); 1351 hdr->pgio_mirror_idx = new_idx; 1352 out_eagain: 1353 rpc_restart_call_prepare(task); 1354 return -EAGAIN; 1355 } 1356 1357 static bool 1358 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1359 { 1360 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1361 } 1362 1363 /* 1364 * We reference the rpc_cred of the first WRITE that triggers the need for 1365 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1366 * rfc5661 is not clear about which credential should be used. 1367 * 1368 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1369 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1370 * we always send layoutcommit after DS writes. 1371 */ 1372 static void 1373 ff_layout_set_layoutcommit(struct inode *inode, 1374 struct pnfs_layout_segment *lseg, 1375 loff_t end_offset) 1376 { 1377 if (!ff_layout_need_layoutcommit(lseg)) 1378 return; 1379 1380 pnfs_set_layoutcommit(inode, lseg, end_offset); 1381 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1382 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1383 } 1384 1385 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1386 struct nfs_pgio_header *hdr) 1387 { 1388 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1389 return; 1390 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1391 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1392 hdr->args.count, 1393 task->tk_start); 1394 } 1395 1396 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1397 struct nfs_pgio_header *hdr) 1398 { 1399 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1400 return; 1401 nfs4_ff_layout_stat_io_end_read(task, 1402 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1403 hdr->args.count, 1404 hdr->res.count); 1405 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1406 } 1407 1408 static int ff_layout_read_prepare_common(struct rpc_task *task, 1409 struct nfs_pgio_header *hdr) 1410 { 1411 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1412 rpc_exit(task, -EIO); 1413 return -EIO; 1414 } 1415 1416 ff_layout_read_record_layoutstats_start(task, hdr); 1417 return 0; 1418 } 1419 1420 /* 1421 * Call ops for the async read/write cases 1422 * In the case of dense layouts, the offset needs to be reset to its 1423 * original value. 1424 */ 1425 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1426 { 1427 struct nfs_pgio_header *hdr = data; 1428 1429 if (ff_layout_read_prepare_common(task, hdr)) 1430 return; 1431 1432 rpc_call_start(task); 1433 } 1434 1435 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1436 { 1437 struct nfs_pgio_header *hdr = data; 1438 1439 if (nfs4_setup_sequence(hdr->ds_clp, 1440 &hdr->args.seq_args, 1441 &hdr->res.seq_res, 1442 task)) 1443 return; 1444 1445 ff_layout_read_prepare_common(task, hdr); 1446 } 1447 1448 static void 1449 ff_layout_io_prepare_transmit(struct rpc_task *task, 1450 void *data) 1451 { 1452 struct nfs_pgio_header *hdr = data; 1453 1454 if (!pnfs_is_valid_lseg(hdr->lseg)) 1455 rpc_exit(task, -EAGAIN); 1456 } 1457 1458 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1459 { 1460 struct nfs_pgio_header *hdr = data; 1461 1462 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 1463 1464 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1465 task->tk_status == 0) { 1466 nfs4_sequence_done(task, &hdr->res.seq_res); 1467 return; 1468 } 1469 1470 /* Note this may cause RPC to be resent */ 1471 hdr->mds_ops->rpc_call_done(task, hdr); 1472 } 1473 1474 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1475 { 1476 struct nfs_pgio_header *hdr = data; 1477 1478 ff_layout_read_record_layoutstats_done(task, hdr); 1479 rpc_count_iostats_metrics(task, 1480 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1481 } 1482 1483 static void ff_layout_read_release(void *data) 1484 { 1485 struct nfs_pgio_header *hdr = data; 1486 1487 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1488 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1489 ff_layout_send_layouterror(hdr->lseg); 1490 pnfs_read_resend_pnfs(hdr); 1491 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1492 ff_layout_reset_read(hdr); 1493 pnfs_generic_rw_release(data); 1494 } 1495 1496 1497 static int ff_layout_write_done_cb(struct rpc_task *task, 1498 struct nfs_pgio_header *hdr) 1499 { 1500 loff_t end_offs = 0; 1501 int err; 1502 1503 trace_nfs4_pnfs_write(hdr, task->tk_status); 1504 if (task->tk_status < 0) 1505 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1506 hdr->args.offset, hdr->args.count, 1507 hdr->res.op_status, OP_WRITE, 1508 task->tk_status); 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 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1514 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1515 switch (err) { 1516 case -NFS4ERR_RESET_TO_PNFS: 1517 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1518 return task->tk_status; 1519 case -NFS4ERR_RESET_TO_MDS: 1520 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1521 return task->tk_status; 1522 case -EAGAIN: 1523 return -EAGAIN; 1524 } 1525 1526 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1527 hdr->res.verf->committed == NFS_DATA_SYNC) 1528 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1529 1530 /* Note: if the write is unstable, don't set end_offs until commit */ 1531 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1532 1533 /* zero out fattr since we don't care DS attr at all */ 1534 hdr->fattr.valid = 0; 1535 if (task->tk_status >= 0) 1536 nfs_writeback_update_inode(hdr); 1537 1538 return 0; 1539 } 1540 1541 static int ff_layout_commit_done_cb(struct rpc_task *task, 1542 struct nfs_commit_data *data) 1543 { 1544 int err; 1545 1546 trace_nfs4_pnfs_commit_ds(data, task->tk_status); 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 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1553 data->lseg, data->ds_commit_index); 1554 1555 switch (err) { 1556 case -NFS4ERR_RESET_TO_PNFS: 1557 pnfs_generic_prepare_to_resend_writes(data); 1558 return -EAGAIN; 1559 case -NFS4ERR_RESET_TO_MDS: 1560 pnfs_generic_prepare_to_resend_writes(data); 1561 return -EAGAIN; 1562 case -EAGAIN: 1563 rpc_restart_call_prepare(task); 1564 return -EAGAIN; 1565 } 1566 1567 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1568 1569 return 0; 1570 } 1571 1572 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1573 struct nfs_pgio_header *hdr) 1574 { 1575 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1576 return; 1577 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1578 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1579 hdr->args.count, 1580 task->tk_start); 1581 } 1582 1583 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1584 struct nfs_pgio_header *hdr) 1585 { 1586 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1587 return; 1588 nfs4_ff_layout_stat_io_end_write(task, 1589 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1590 hdr->args.count, hdr->res.count, 1591 hdr->res.verf->committed); 1592 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1593 } 1594 1595 static int ff_layout_write_prepare_common(struct rpc_task *task, 1596 struct nfs_pgio_header *hdr) 1597 { 1598 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1599 rpc_exit(task, -EIO); 1600 return -EIO; 1601 } 1602 1603 ff_layout_write_record_layoutstats_start(task, hdr); 1604 return 0; 1605 } 1606 1607 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1608 { 1609 struct nfs_pgio_header *hdr = data; 1610 1611 if (ff_layout_write_prepare_common(task, hdr)) 1612 return; 1613 1614 rpc_call_start(task); 1615 } 1616 1617 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1618 { 1619 struct nfs_pgio_header *hdr = data; 1620 1621 if (nfs4_setup_sequence(hdr->ds_clp, 1622 &hdr->args.seq_args, 1623 &hdr->res.seq_res, 1624 task)) 1625 return; 1626 1627 ff_layout_write_prepare_common(task, hdr); 1628 } 1629 1630 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1631 { 1632 struct nfs_pgio_header *hdr = data; 1633 1634 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1635 task->tk_status == 0) { 1636 nfs4_sequence_done(task, &hdr->res.seq_res); 1637 return; 1638 } 1639 1640 /* Note this may cause RPC to be resent */ 1641 hdr->mds_ops->rpc_call_done(task, hdr); 1642 } 1643 1644 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1645 { 1646 struct nfs_pgio_header *hdr = data; 1647 1648 ff_layout_write_record_layoutstats_done(task, hdr); 1649 rpc_count_iostats_metrics(task, 1650 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1651 } 1652 1653 static void ff_layout_write_release(void *data) 1654 { 1655 struct nfs_pgio_header *hdr = data; 1656 1657 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1658 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1659 ff_layout_send_layouterror(hdr->lseg); 1660 ff_layout_reset_write(hdr, true); 1661 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1662 ff_layout_reset_write(hdr, false); 1663 pnfs_generic_rw_release(data); 1664 } 1665 1666 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1667 struct nfs_commit_data *cdata) 1668 { 1669 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1670 return; 1671 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1672 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1673 0, task->tk_start); 1674 } 1675 1676 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1677 struct nfs_commit_data *cdata) 1678 { 1679 struct nfs_page *req; 1680 __u64 count = 0; 1681 1682 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1683 return; 1684 1685 if (task->tk_status == 0) { 1686 list_for_each_entry(req, &cdata->pages, wb_list) 1687 count += req->wb_bytes; 1688 } 1689 nfs4_ff_layout_stat_io_end_write(task, 1690 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1691 count, count, NFS_FILE_SYNC); 1692 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 1693 } 1694 1695 static void ff_layout_commit_prepare_common(struct rpc_task *task, 1696 struct nfs_commit_data *cdata) 1697 { 1698 ff_layout_commit_record_layoutstats_start(task, cdata); 1699 } 1700 1701 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1702 { 1703 ff_layout_commit_prepare_common(task, data); 1704 rpc_call_start(task); 1705 } 1706 1707 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1708 { 1709 struct nfs_commit_data *wdata = data; 1710 1711 if (nfs4_setup_sequence(wdata->ds_clp, 1712 &wdata->args.seq_args, 1713 &wdata->res.seq_res, 1714 task)) 1715 return; 1716 ff_layout_commit_prepare_common(task, data); 1717 } 1718 1719 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1720 { 1721 pnfs_generic_write_commit_done(task, data); 1722 } 1723 1724 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1725 { 1726 struct nfs_commit_data *cdata = data; 1727 1728 ff_layout_commit_record_layoutstats_done(task, cdata); 1729 rpc_count_iostats_metrics(task, 1730 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1731 } 1732 1733 static void ff_layout_commit_release(void *data) 1734 { 1735 struct nfs_commit_data *cdata = data; 1736 1737 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1738 pnfs_generic_commit_release(data); 1739 } 1740 1741 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1742 .rpc_call_prepare = ff_layout_read_prepare_v3, 1743 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit, 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_read_call_ops_v4 = { 1750 .rpc_call_prepare = ff_layout_read_prepare_v4, 1751 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit, 1752 .rpc_call_done = ff_layout_read_call_done, 1753 .rpc_count_stats = ff_layout_read_count_stats, 1754 .rpc_release = ff_layout_read_release, 1755 }; 1756 1757 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1758 .rpc_call_prepare = ff_layout_write_prepare_v3, 1759 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit, 1760 .rpc_call_done = ff_layout_write_call_done, 1761 .rpc_count_stats = ff_layout_write_count_stats, 1762 .rpc_release = ff_layout_write_release, 1763 }; 1764 1765 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1766 .rpc_call_prepare = ff_layout_write_prepare_v4, 1767 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit, 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