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 enum nfs4_ff_op_type { 34 NFS4_FF_OP_LAYOUTSTATS, 35 NFS4_FF_OP_LAYOUTRETURN, 36 }; 37 38 static unsigned short io_maxretrans; 39 40 static const struct pnfs_commit_ops ff_layout_commit_ops; 41 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 42 struct nfs_pgio_header *hdr); 43 static int 44 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 45 struct nfs42_layoutstat_devinfo *devinfo, 46 int dev_limit, enum nfs4_ff_op_type type); 47 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 48 const struct nfs42_layoutstat_devinfo *devinfo, 49 struct nfs4_ff_layout_mirror *mirror); 50 51 static struct pnfs_layout_hdr * 52 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 53 { 54 struct nfs4_flexfile_layout *ffl; 55 56 ffl = kzalloc(sizeof(*ffl), gfp_flags); 57 if (ffl) { 58 pnfs_init_ds_commit_info(&ffl->commit_info); 59 INIT_LIST_HEAD(&ffl->error_list); 60 INIT_LIST_HEAD(&ffl->mirrors); 61 ffl->last_report_time = ktime_get(); 62 ffl->commit_info.ops = &ff_layout_commit_ops; 63 return &ffl->generic_hdr; 64 } else 65 return NULL; 66 } 67 68 static void 69 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo) 70 { 71 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo); 72 struct nfs4_ff_layout_ds_err *err, *n; 73 74 list_for_each_entry_safe(err, n, &ffl->error_list, list) { 75 list_del(&err->list); 76 kfree(err); 77 } 78 kfree_rcu(ffl, generic_hdr.plh_rcu); 79 } 80 81 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 82 { 83 __be32 *p; 84 85 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 86 if (unlikely(p == NULL)) 87 return -ENOBUFS; 88 stateid->type = NFS4_PNFS_DS_STATEID_TYPE; 89 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 90 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__, 91 p[0], p[1], p[2], p[3]); 92 return 0; 93 } 94 95 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid) 96 { 97 __be32 *p; 98 99 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE); 100 if (unlikely(!p)) 101 return -ENOBUFS; 102 memcpy(devid, p, NFS4_DEVICEID4_SIZE); 103 nfs4_print_deviceid(devid); 104 return 0; 105 } 106 107 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 108 { 109 __be32 *p; 110 111 p = xdr_inline_decode(xdr, 4); 112 if (unlikely(!p)) 113 return -ENOBUFS; 114 fh->size = be32_to_cpup(p++); 115 if (fh->size > NFS_MAXFHSIZE) { 116 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n", 117 fh->size); 118 return -EOVERFLOW; 119 } 120 /* fh.data */ 121 p = xdr_inline_decode(xdr, fh->size); 122 if (unlikely(!p)) 123 return -ENOBUFS; 124 memcpy(&fh->data, p, fh->size); 125 dprintk("%s: fh len %d\n", __func__, fh->size); 126 127 return 0; 128 } 129 130 /* 131 * Currently only stringified uids and gids are accepted. 132 * I.e., kerberos is not supported to the DSes, so no pricipals. 133 * 134 * That means that one common function will suffice, but when 135 * principals are added, this should be split to accomodate 136 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid(). 137 */ 138 static int 139 decode_name(struct xdr_stream *xdr, u32 *id) 140 { 141 __be32 *p; 142 int len; 143 144 /* opaque_length(4)*/ 145 p = xdr_inline_decode(xdr, 4); 146 if (unlikely(!p)) 147 return -ENOBUFS; 148 len = be32_to_cpup(p++); 149 if (len < 0) 150 return -EINVAL; 151 152 dprintk("%s: len %u\n", __func__, len); 153 154 /* opaque body */ 155 p = xdr_inline_decode(xdr, len); 156 if (unlikely(!p)) 157 return -ENOBUFS; 158 159 if (!nfs_map_string_to_numeric((char *)p, len, id)) 160 return -EINVAL; 161 162 return 0; 163 } 164 165 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1, 166 const struct nfs4_ff_layout_mirror *m2) 167 { 168 int i, j; 169 170 if (m1->fh_versions_cnt != m2->fh_versions_cnt) 171 return false; 172 for (i = 0; i < m1->fh_versions_cnt; i++) { 173 bool found_fh = false; 174 for (j = 0; j < m2->fh_versions_cnt; j++) { 175 if (nfs_compare_fh(&m1->fh_versions[i], 176 &m2->fh_versions[j]) == 0) { 177 found_fh = true; 178 break; 179 } 180 } 181 if (!found_fh) 182 return false; 183 } 184 return true; 185 } 186 187 static struct nfs4_ff_layout_mirror * 188 ff_layout_add_mirror(struct pnfs_layout_hdr *lo, 189 struct nfs4_ff_layout_mirror *mirror) 190 { 191 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 192 struct nfs4_ff_layout_mirror *pos; 193 struct inode *inode = lo->plh_inode; 194 195 spin_lock(&inode->i_lock); 196 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) { 197 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0) 198 continue; 199 if (!ff_mirror_match_fh(mirror, pos)) 200 continue; 201 if (refcount_inc_not_zero(&pos->ref)) { 202 spin_unlock(&inode->i_lock); 203 return pos; 204 } 205 } 206 list_add(&mirror->mirrors, &ff_layout->mirrors); 207 mirror->layout = lo; 208 spin_unlock(&inode->i_lock); 209 return mirror; 210 } 211 212 static void 213 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror) 214 { 215 struct inode *inode; 216 if (mirror->layout == NULL) 217 return; 218 inode = mirror->layout->plh_inode; 219 spin_lock(&inode->i_lock); 220 list_del(&mirror->mirrors); 221 spin_unlock(&inode->i_lock); 222 mirror->layout = NULL; 223 } 224 225 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags) 226 { 227 struct nfs4_ff_layout_mirror *mirror; 228 229 mirror = kzalloc(sizeof(*mirror), gfp_flags); 230 if (mirror != NULL) { 231 spin_lock_init(&mirror->lock); 232 refcount_set(&mirror->ref, 1); 233 INIT_LIST_HEAD(&mirror->mirrors); 234 } 235 return mirror; 236 } 237 238 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror) 239 { 240 const struct cred *cred; 241 242 ff_layout_remove_mirror(mirror); 243 kfree(mirror->fh_versions); 244 cred = rcu_access_pointer(mirror->ro_cred); 245 put_cred(cred); 246 cred = rcu_access_pointer(mirror->rw_cred); 247 put_cred(cred); 248 nfs4_ff_layout_put_deviceid(mirror->mirror_ds); 249 kfree(mirror); 250 } 251 252 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror) 253 { 254 if (mirror != NULL && refcount_dec_and_test(&mirror->ref)) 255 ff_layout_free_mirror(mirror); 256 } 257 258 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls) 259 { 260 u32 i; 261 262 for (i = 0; i < fls->mirror_array_cnt; i++) 263 ff_layout_put_mirror(fls->mirror_array[i]); 264 } 265 266 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls) 267 { 268 if (fls) { 269 ff_layout_free_mirror_array(fls); 270 kfree(fls); 271 } 272 } 273 274 static bool 275 ff_lseg_match_mirrors(struct pnfs_layout_segment *l1, 276 struct pnfs_layout_segment *l2) 277 { 278 const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1); 279 const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1); 280 u32 i; 281 282 if (fl1->mirror_array_cnt != fl2->mirror_array_cnt) 283 return false; 284 for (i = 0; i < fl1->mirror_array_cnt; i++) { 285 if (fl1->mirror_array[i] != fl2->mirror_array[i]) 286 return false; 287 } 288 return true; 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 if (!ff_lseg_match_mirrors(new, old)) 327 return false; 328 329 /* Mergeable: copy info from 'old' to 'new' */ 330 if (new_end < old_end) 331 new_end = old_end; 332 if (new->pls_range.offset < old->pls_range.offset) 333 new->pls_range.offset = old->pls_range.offset; 334 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset, 335 new_end); 336 if (test_bit(NFS_LSEG_ROC, &old->pls_flags)) 337 set_bit(NFS_LSEG_ROC, &new->pls_flags); 338 return true; 339 } 340 341 static void 342 ff_layout_add_lseg(struct pnfs_layout_hdr *lo, 343 struct pnfs_layout_segment *lseg, 344 struct list_head *free_me) 345 { 346 pnfs_generic_layout_insert_lseg(lo, lseg, 347 ff_lseg_range_is_after, 348 ff_lseg_merge, 349 free_me); 350 } 351 352 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls) 353 { 354 int i, j; 355 356 for (i = 0; i < fls->mirror_array_cnt - 1; i++) { 357 for (j = i + 1; j < fls->mirror_array_cnt; j++) 358 if (fls->mirror_array[i]->efficiency < 359 fls->mirror_array[j]->efficiency) 360 swap(fls->mirror_array[i], 361 fls->mirror_array[j]); 362 } 363 } 364 365 static struct pnfs_layout_segment * 366 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh, 367 struct nfs4_layoutget_res *lgr, 368 gfp_t gfp_flags) 369 { 370 struct pnfs_layout_segment *ret; 371 struct nfs4_ff_layout_segment *fls = NULL; 372 struct xdr_stream stream; 373 struct xdr_buf buf; 374 struct page *scratch; 375 u64 stripe_unit; 376 u32 mirror_array_cnt; 377 __be32 *p; 378 int i, rc; 379 380 dprintk("--> %s\n", __func__); 381 scratch = alloc_page(gfp_flags); 382 if (!scratch) 383 return ERR_PTR(-ENOMEM); 384 385 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, 386 lgr->layoutp->len); 387 xdr_set_scratch_page(&stream, scratch); 388 389 /* stripe unit and mirror_array_cnt */ 390 rc = -EIO; 391 p = xdr_inline_decode(&stream, 8 + 4); 392 if (!p) 393 goto out_err_free; 394 395 p = xdr_decode_hyper(p, &stripe_unit); 396 mirror_array_cnt = be32_to_cpup(p++); 397 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__, 398 stripe_unit, mirror_array_cnt); 399 400 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT || 401 mirror_array_cnt == 0) 402 goto out_err_free; 403 404 rc = -ENOMEM; 405 fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt), 406 gfp_flags); 407 if (!fls) 408 goto out_err_free; 409 410 fls->mirror_array_cnt = mirror_array_cnt; 411 fls->stripe_unit = stripe_unit; 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(&init_task); 497 else { 498 unsigned int nofs_flags = memalloc_nofs_save(); 499 kcred = prepare_kernel_cred(&init_task); 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 ret = &fls->generic_hdr; 548 dprintk("<-- %s (success)\n", __func__); 549 out_free_page: 550 __free_page(scratch); 551 return ret; 552 out_err_free: 553 _ff_layout_free_lseg(fls); 554 ret = ERR_PTR(rc); 555 dprintk("<-- %s (%d)\n", __func__, rc); 556 goto out_free_page; 557 } 558 559 static void 560 ff_layout_free_lseg(struct pnfs_layout_segment *lseg) 561 { 562 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 563 564 dprintk("--> %s\n", __func__); 565 566 if (lseg->pls_range.iomode == IOMODE_RW) { 567 struct nfs4_flexfile_layout *ffl; 568 struct inode *inode; 569 570 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout); 571 inode = ffl->generic_hdr.plh_inode; 572 spin_lock(&inode->i_lock); 573 pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg); 574 spin_unlock(&inode->i_lock); 575 } 576 _ff_layout_free_lseg(fls); 577 } 578 579 static void 580 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 581 { 582 /* first IO request? */ 583 if (atomic_inc_return(&timer->n_ops) == 1) { 584 timer->start_time = now; 585 } 586 } 587 588 static ktime_t 589 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 590 { 591 ktime_t start; 592 593 if (atomic_dec_return(&timer->n_ops) < 0) 594 WARN_ON_ONCE(1); 595 596 start = timer->start_time; 597 timer->start_time = now; 598 return ktime_sub(now, start); 599 } 600 601 static bool 602 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 603 struct nfs4_ff_layoutstat *layoutstat, 604 ktime_t now) 605 { 606 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL; 607 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout); 608 609 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now); 610 if (!mirror->start_time) 611 mirror->start_time = now; 612 if (mirror->report_interval != 0) 613 report_interval = (s64)mirror->report_interval * 1000LL; 614 else if (layoutstats_timer != 0) 615 report_interval = (s64)layoutstats_timer * 1000LL; 616 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >= 617 report_interval) { 618 ffl->last_report_time = now; 619 return true; 620 } 621 622 return false; 623 } 624 625 static void 626 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat, 627 __u64 requested) 628 { 629 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 630 631 iostat->ops_requested++; 632 iostat->bytes_requested += requested; 633 } 634 635 static void 636 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat, 637 __u64 requested, 638 __u64 completed, 639 ktime_t time_completed, 640 ktime_t time_started) 641 { 642 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 643 ktime_t completion_time = ktime_sub(time_completed, time_started); 644 ktime_t timer; 645 646 iostat->ops_completed++; 647 iostat->bytes_completed += completed; 648 iostat->bytes_not_delivered += requested - completed; 649 650 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed); 651 iostat->total_busy_time = 652 ktime_add(iostat->total_busy_time, timer); 653 iostat->aggregate_completion_time = 654 ktime_add(iostat->aggregate_completion_time, 655 completion_time); 656 } 657 658 static void 659 nfs4_ff_layout_stat_io_start_read(struct inode *inode, 660 struct nfs4_ff_layout_mirror *mirror, 661 __u64 requested, ktime_t now) 662 { 663 bool report; 664 665 spin_lock(&mirror->lock); 666 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now); 667 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested); 668 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 669 spin_unlock(&mirror->lock); 670 671 if (report) 672 pnfs_report_layoutstat(inode, nfs_io_gfp_mask()); 673 } 674 675 static void 676 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task, 677 struct nfs4_ff_layout_mirror *mirror, 678 __u64 requested, 679 __u64 completed) 680 { 681 spin_lock(&mirror->lock); 682 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat, 683 requested, completed, 684 ktime_get(), task->tk_start); 685 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 686 spin_unlock(&mirror->lock); 687 } 688 689 static void 690 nfs4_ff_layout_stat_io_start_write(struct inode *inode, 691 struct nfs4_ff_layout_mirror *mirror, 692 __u64 requested, ktime_t now) 693 { 694 bool report; 695 696 spin_lock(&mirror->lock); 697 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now); 698 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested); 699 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 700 spin_unlock(&mirror->lock); 701 702 if (report) 703 pnfs_report_layoutstat(inode, nfs_io_gfp_mask()); 704 } 705 706 static void 707 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, 708 struct nfs4_ff_layout_mirror *mirror, 709 __u64 requested, 710 __u64 completed, 711 enum nfs3_stable_how committed) 712 { 713 if (committed == NFS_UNSTABLE) 714 requested = completed = 0; 715 716 spin_lock(&mirror->lock); 717 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat, 718 requested, completed, ktime_get(), task->tk_start); 719 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 720 spin_unlock(&mirror->lock); 721 } 722 723 static void 724 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx) 725 { 726 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 727 728 if (devid) 729 nfs4_mark_deviceid_unavailable(devid); 730 } 731 732 static void 733 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx) 734 { 735 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 736 737 if (devid) 738 nfs4_mark_deviceid_available(devid); 739 } 740 741 static struct nfs4_pnfs_ds * 742 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, 743 u32 start_idx, u32 *best_idx, 744 bool check_device) 745 { 746 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 747 struct nfs4_ff_layout_mirror *mirror; 748 struct nfs4_pnfs_ds *ds; 749 u32 idx; 750 751 /* mirrors are initially sorted by efficiency */ 752 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 753 mirror = FF_LAYOUT_COMP(lseg, idx); 754 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 755 if (!ds) 756 continue; 757 758 if (check_device && 759 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node)) 760 continue; 761 762 *best_idx = idx; 763 return ds; 764 } 765 766 return NULL; 767 } 768 769 static struct nfs4_pnfs_ds * 770 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg, 771 u32 start_idx, u32 *best_idx) 772 { 773 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false); 774 } 775 776 static struct nfs4_pnfs_ds * 777 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg, 778 u32 start_idx, u32 *best_idx) 779 { 780 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true); 781 } 782 783 static struct nfs4_pnfs_ds * 784 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 785 u32 start_idx, u32 *best_idx) 786 { 787 struct nfs4_pnfs_ds *ds; 788 789 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx); 790 if (ds) 791 return ds; 792 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx); 793 } 794 795 static struct nfs4_pnfs_ds * 796 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio, 797 u32 *best_idx) 798 { 799 struct pnfs_layout_segment *lseg = pgio->pg_lseg; 800 struct nfs4_pnfs_ds *ds; 801 802 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx, 803 best_idx); 804 if (ds || !pgio->pg_mirror_idx) 805 return ds; 806 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx); 807 } 808 809 static void 810 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio, 811 struct nfs_page *req, 812 bool strict_iomode) 813 { 814 pnfs_put_lseg(pgio->pg_lseg); 815 pgio->pg_lseg = 816 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 817 req_offset(req), req->wb_bytes, IOMODE_READ, 818 strict_iomode, nfs_io_gfp_mask()); 819 if (IS_ERR(pgio->pg_lseg)) { 820 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 821 pgio->pg_lseg = NULL; 822 } 823 } 824 825 static void 826 ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio, 827 struct nfs_page *req) 828 { 829 pnfs_generic_pg_check_layout(pgio); 830 pnfs_generic_pg_check_range(pgio, req); 831 } 832 833 static void 834 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 835 struct nfs_page *req) 836 { 837 struct nfs_pgio_mirror *pgm; 838 struct nfs4_ff_layout_mirror *mirror; 839 struct nfs4_pnfs_ds *ds; 840 u32 ds_idx; 841 842 retry: 843 ff_layout_pg_check_layout(pgio, req); 844 /* Use full layout for now */ 845 if (!pgio->pg_lseg) { 846 ff_layout_pg_get_read(pgio, req, false); 847 if (!pgio->pg_lseg) 848 goto out_nolseg; 849 } 850 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 851 ff_layout_pg_get_read(pgio, req, true); 852 if (!pgio->pg_lseg) 853 goto out_nolseg; 854 } 855 856 ds = ff_layout_get_ds_for_read(pgio, &ds_idx); 857 if (!ds) { 858 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 859 goto out_mds; 860 pnfs_generic_pg_cleanup(pgio); 861 /* Sleep for 1 second before retrying */ 862 ssleep(1); 863 goto retry; 864 } 865 866 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 867 pgm = &pgio->pg_mirrors[0]; 868 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; 869 870 pgio->pg_mirror_idx = ds_idx; 871 872 if (NFS_SERVER(pgio->pg_inode)->flags & 873 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 874 pgio->pg_maxretrans = io_maxretrans; 875 return; 876 out_nolseg: 877 if (pgio->pg_error < 0) 878 return; 879 out_mds: 880 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode, 881 0, NFS4_MAX_UINT64, IOMODE_READ, 882 NFS_I(pgio->pg_inode)->layout, 883 pgio->pg_lseg); 884 pgio->pg_maxretrans = 0; 885 nfs_pageio_reset_read_mds(pgio); 886 } 887 888 static void 889 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 890 struct nfs_page *req) 891 { 892 struct nfs4_ff_layout_mirror *mirror; 893 struct nfs_pgio_mirror *pgm; 894 struct nfs4_pnfs_ds *ds; 895 u32 i; 896 897 retry: 898 ff_layout_pg_check_layout(pgio, req); 899 if (!pgio->pg_lseg) { 900 pgio->pg_lseg = 901 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 902 req_offset(req), req->wb_bytes, 903 IOMODE_RW, false, nfs_io_gfp_mask()); 904 if (IS_ERR(pgio->pg_lseg)) { 905 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 906 pgio->pg_lseg = NULL; 907 return; 908 } 909 } 910 /* If no lseg, fall back to write through mds */ 911 if (pgio->pg_lseg == NULL) 912 goto out_mds; 913 914 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 915 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)) 916 goto out_eagain; 917 918 for (i = 0; i < pgio->pg_mirror_count; i++) { 919 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 920 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true); 921 if (!ds) { 922 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 923 goto out_mds; 924 pnfs_generic_pg_cleanup(pgio); 925 /* Sleep for 1 second before retrying */ 926 ssleep(1); 927 goto retry; 928 } 929 pgm = &pgio->pg_mirrors[i]; 930 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize; 931 } 932 933 if (NFS_SERVER(pgio->pg_inode)->flags & 934 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 935 pgio->pg_maxretrans = io_maxretrans; 936 return; 937 out_eagain: 938 pnfs_generic_pg_cleanup(pgio); 939 pgio->pg_error = -EAGAIN; 940 return; 941 out_mds: 942 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode, 943 0, NFS4_MAX_UINT64, IOMODE_RW, 944 NFS_I(pgio->pg_inode)->layout, 945 pgio->pg_lseg); 946 pgio->pg_maxretrans = 0; 947 nfs_pageio_reset_write_mds(pgio); 948 pgio->pg_error = -EAGAIN; 949 } 950 951 static unsigned int 952 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 953 struct nfs_page *req) 954 { 955 if (!pgio->pg_lseg) { 956 pgio->pg_lseg = 957 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 958 req_offset(req), req->wb_bytes, 959 IOMODE_RW, false, nfs_io_gfp_mask()); 960 if (IS_ERR(pgio->pg_lseg)) { 961 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 962 pgio->pg_lseg = NULL; 963 goto out; 964 } 965 } 966 if (pgio->pg_lseg) 967 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 968 969 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode, 970 0, NFS4_MAX_UINT64, IOMODE_RW, 971 NFS_I(pgio->pg_inode)->layout, 972 pgio->pg_lseg); 973 /* no lseg means that pnfs is not in use, so no mirroring here */ 974 nfs_pageio_reset_write_mds(pgio); 975 out: 976 return 1; 977 } 978 979 static u32 980 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 981 { 982 u32 old = desc->pg_mirror_idx; 983 984 desc->pg_mirror_idx = idx; 985 return old; 986 } 987 988 static struct nfs_pgio_mirror * 989 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 990 { 991 return &desc->pg_mirrors[idx]; 992 } 993 994 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 995 .pg_init = ff_layout_pg_init_read, 996 .pg_test = pnfs_generic_pg_test, 997 .pg_doio = pnfs_generic_pg_readpages, 998 .pg_cleanup = pnfs_generic_pg_cleanup, 999 }; 1000 1001 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 1002 .pg_init = ff_layout_pg_init_write, 1003 .pg_test = pnfs_generic_pg_test, 1004 .pg_doio = pnfs_generic_pg_writepages, 1005 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 1006 .pg_cleanup = pnfs_generic_pg_cleanup, 1007 .pg_get_mirror = ff_layout_pg_get_mirror_write, 1008 .pg_set_mirror = ff_layout_pg_set_mirror_write, 1009 }; 1010 1011 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 1012 { 1013 struct rpc_task *task = &hdr->task; 1014 1015 pnfs_layoutcommit_inode(hdr->inode, false); 1016 1017 if (retry_pnfs) { 1018 dprintk("%s Reset task %5u for i/o through pNFS " 1019 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1020 hdr->task.tk_pid, 1021 hdr->inode->i_sb->s_id, 1022 (unsigned long long)NFS_FILEID(hdr->inode), 1023 hdr->args.count, 1024 (unsigned long long)hdr->args.offset); 1025 1026 hdr->completion_ops->reschedule_io(hdr); 1027 return; 1028 } 1029 1030 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1031 dprintk("%s Reset task %5u for i/o through MDS " 1032 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1033 hdr->task.tk_pid, 1034 hdr->inode->i_sb->s_id, 1035 (unsigned long long)NFS_FILEID(hdr->inode), 1036 hdr->args.count, 1037 (unsigned long long)hdr->args.offset); 1038 1039 trace_pnfs_mds_fallback_write_done(hdr->inode, 1040 hdr->args.offset, hdr->args.count, 1041 IOMODE_RW, NFS_I(hdr->inode)->layout, 1042 hdr->lseg); 1043 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1044 } 1045 } 1046 1047 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr) 1048 { 1049 u32 idx = hdr->pgio_mirror_idx + 1; 1050 u32 new_idx = 0; 1051 1052 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx)) 1053 ff_layout_send_layouterror(hdr->lseg); 1054 else 1055 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1056 pnfs_read_resend_pnfs(hdr, new_idx); 1057 } 1058 1059 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1060 { 1061 struct rpc_task *task = &hdr->task; 1062 1063 pnfs_layoutcommit_inode(hdr->inode, false); 1064 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1065 1066 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1067 dprintk("%s Reset task %5u for i/o through MDS " 1068 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1069 hdr->task.tk_pid, 1070 hdr->inode->i_sb->s_id, 1071 (unsigned long long)NFS_FILEID(hdr->inode), 1072 hdr->args.count, 1073 (unsigned long long)hdr->args.offset); 1074 1075 trace_pnfs_mds_fallback_read_done(hdr->inode, 1076 hdr->args.offset, hdr->args.count, 1077 IOMODE_READ, NFS_I(hdr->inode)->layout, 1078 hdr->lseg); 1079 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1080 } 1081 } 1082 1083 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1084 struct nfs4_state *state, 1085 struct nfs_client *clp, 1086 struct pnfs_layout_segment *lseg, 1087 u32 idx) 1088 { 1089 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1090 struct inode *inode = lo->plh_inode; 1091 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1092 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1093 1094 switch (task->tk_status) { 1095 case -NFS4ERR_BADSESSION: 1096 case -NFS4ERR_BADSLOT: 1097 case -NFS4ERR_BAD_HIGH_SLOT: 1098 case -NFS4ERR_DEADSESSION: 1099 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1100 case -NFS4ERR_SEQ_FALSE_RETRY: 1101 case -NFS4ERR_SEQ_MISORDERED: 1102 dprintk("%s ERROR %d, Reset session. Exchangeid " 1103 "flags 0x%x\n", __func__, task->tk_status, 1104 clp->cl_exchange_flags); 1105 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1106 break; 1107 case -NFS4ERR_DELAY: 1108 case -NFS4ERR_GRACE: 1109 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1110 break; 1111 case -NFS4ERR_RETRY_UNCACHED_REP: 1112 break; 1113 /* Invalidate Layout errors */ 1114 case -NFS4ERR_PNFS_NO_LAYOUT: 1115 case -ESTALE: /* mapped NFS4ERR_STALE */ 1116 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 1117 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 1118 case -NFS4ERR_FHEXPIRED: 1119 case -NFS4ERR_WRONG_TYPE: 1120 dprintk("%s Invalid layout error %d\n", __func__, 1121 task->tk_status); 1122 /* 1123 * Destroy layout so new i/o will get a new layout. 1124 * Layout will not be destroyed until all current lseg 1125 * references are put. Mark layout as invalid to resend failed 1126 * i/o and all i/o waiting on the slot table to the MDS until 1127 * layout is destroyed and a new valid layout is obtained. 1128 */ 1129 pnfs_destroy_layout(NFS_I(inode)); 1130 rpc_wake_up(&tbl->slot_tbl_waitq); 1131 goto reset; 1132 /* RPC connection errors */ 1133 case -ECONNREFUSED: 1134 case -EHOSTDOWN: 1135 case -EHOSTUNREACH: 1136 case -ENETUNREACH: 1137 case -EIO: 1138 case -ETIMEDOUT: 1139 case -EPIPE: 1140 case -EPROTO: 1141 case -ENODEV: 1142 dprintk("%s DS connection error %d\n", __func__, 1143 task->tk_status); 1144 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1145 &devid->deviceid); 1146 rpc_wake_up(&tbl->slot_tbl_waitq); 1147 fallthrough; 1148 default: 1149 if (ff_layout_avoid_mds_available_ds(lseg)) 1150 return -NFS4ERR_RESET_TO_PNFS; 1151 reset: 1152 dprintk("%s Retry through MDS. Error %d\n", __func__, 1153 task->tk_status); 1154 return -NFS4ERR_RESET_TO_MDS; 1155 } 1156 task->tk_status = 0; 1157 return -EAGAIN; 1158 } 1159 1160 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1161 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1162 struct pnfs_layout_segment *lseg, 1163 u32 idx) 1164 { 1165 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1166 1167 switch (task->tk_status) { 1168 /* File access problems. Don't mark the device as unavailable */ 1169 case -EACCES: 1170 case -ESTALE: 1171 case -EISDIR: 1172 case -EBADHANDLE: 1173 case -ELOOP: 1174 case -ENOSPC: 1175 break; 1176 case -EJUKEBOX: 1177 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1178 goto out_retry; 1179 default: 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 } 1185 /* FIXME: Need to prevent infinite looping here. */ 1186 return -NFS4ERR_RESET_TO_PNFS; 1187 out_retry: 1188 task->tk_status = 0; 1189 rpc_restart_call_prepare(task); 1190 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1191 return -EAGAIN; 1192 } 1193 1194 static int ff_layout_async_handle_error(struct rpc_task *task, 1195 struct nfs4_state *state, 1196 struct nfs_client *clp, 1197 struct pnfs_layout_segment *lseg, 1198 u32 idx) 1199 { 1200 int vers = clp->cl_nfs_mod->rpc_vers->number; 1201 1202 if (task->tk_status >= 0) { 1203 ff_layout_mark_ds_reachable(lseg, idx); 1204 return 0; 1205 } 1206 1207 /* Handle the case of an invalid layout segment */ 1208 if (!pnfs_is_valid_lseg(lseg)) 1209 return -NFS4ERR_RESET_TO_PNFS; 1210 1211 switch (vers) { 1212 case 3: 1213 return ff_layout_async_handle_error_v3(task, lseg, idx); 1214 case 4: 1215 return ff_layout_async_handle_error_v4(task, state, clp, 1216 lseg, idx); 1217 default: 1218 /* should never happen */ 1219 WARN_ON_ONCE(1); 1220 return 0; 1221 } 1222 } 1223 1224 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1225 u32 idx, u64 offset, u64 length, 1226 u32 *op_status, int opnum, int error) 1227 { 1228 struct nfs4_ff_layout_mirror *mirror; 1229 u32 status = *op_status; 1230 int err; 1231 1232 if (status == 0) { 1233 switch (error) { 1234 case -ETIMEDOUT: 1235 case -EPFNOSUPPORT: 1236 case -EPROTONOSUPPORT: 1237 case -EOPNOTSUPP: 1238 case -EINVAL: 1239 case -ECONNREFUSED: 1240 case -ECONNRESET: 1241 case -EHOSTDOWN: 1242 case -EHOSTUNREACH: 1243 case -ENETUNREACH: 1244 case -EADDRINUSE: 1245 case -ENOBUFS: 1246 case -EPIPE: 1247 case -EPERM: 1248 case -EPROTO: 1249 case -ENODEV: 1250 *op_status = status = NFS4ERR_NXIO; 1251 break; 1252 case -EACCES: 1253 *op_status = status = NFS4ERR_ACCESS; 1254 break; 1255 default: 1256 return; 1257 } 1258 } 1259 1260 mirror = FF_LAYOUT_COMP(lseg, idx); 1261 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1262 mirror, offset, length, status, opnum, 1263 nfs_io_gfp_mask()); 1264 1265 switch (status) { 1266 case NFS4ERR_DELAY: 1267 case NFS4ERR_GRACE: 1268 break; 1269 case NFS4ERR_NXIO: 1270 ff_layout_mark_ds_unreachable(lseg, idx); 1271 /* 1272 * Don't return the layout if this is a read and we still 1273 * have layouts to try 1274 */ 1275 if (opnum == OP_READ) 1276 break; 1277 fallthrough; 1278 default: 1279 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, 1280 lseg); 1281 } 1282 1283 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1284 } 1285 1286 /* NFS_PROTO call done callback routines */ 1287 static int ff_layout_read_done_cb(struct rpc_task *task, 1288 struct nfs_pgio_header *hdr) 1289 { 1290 int err; 1291 1292 if (task->tk_status < 0) { 1293 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1294 hdr->args.offset, hdr->args.count, 1295 &hdr->res.op_status, OP_READ, 1296 task->tk_status); 1297 trace_ff_layout_read_error(hdr); 1298 } 1299 1300 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1301 hdr->ds_clp, hdr->lseg, 1302 hdr->pgio_mirror_idx); 1303 1304 trace_nfs4_pnfs_read(hdr, err); 1305 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1306 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1307 switch (err) { 1308 case -NFS4ERR_RESET_TO_PNFS: 1309 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1310 return task->tk_status; 1311 case -NFS4ERR_RESET_TO_MDS: 1312 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1313 return task->tk_status; 1314 case -EAGAIN: 1315 goto out_eagain; 1316 } 1317 1318 return 0; 1319 out_eagain: 1320 rpc_restart_call_prepare(task); 1321 return -EAGAIN; 1322 } 1323 1324 static bool 1325 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1326 { 1327 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1328 } 1329 1330 /* 1331 * We reference the rpc_cred of the first WRITE that triggers the need for 1332 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1333 * rfc5661 is not clear about which credential should be used. 1334 * 1335 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1336 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1337 * we always send layoutcommit after DS writes. 1338 */ 1339 static void 1340 ff_layout_set_layoutcommit(struct inode *inode, 1341 struct pnfs_layout_segment *lseg, 1342 loff_t end_offset) 1343 { 1344 if (!ff_layout_need_layoutcommit(lseg)) 1345 return; 1346 1347 pnfs_set_layoutcommit(inode, lseg, end_offset); 1348 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1349 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1350 } 1351 1352 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1353 struct nfs_pgio_header *hdr) 1354 { 1355 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1356 return; 1357 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1358 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1359 hdr->args.count, 1360 task->tk_start); 1361 } 1362 1363 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1364 struct nfs_pgio_header *hdr) 1365 { 1366 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1367 return; 1368 nfs4_ff_layout_stat_io_end_read(task, 1369 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1370 hdr->args.count, 1371 hdr->res.count); 1372 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1373 } 1374 1375 static int ff_layout_read_prepare_common(struct rpc_task *task, 1376 struct nfs_pgio_header *hdr) 1377 { 1378 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1379 rpc_exit(task, -EIO); 1380 return -EIO; 1381 } 1382 1383 if (!pnfs_is_valid_lseg(hdr->lseg)) { 1384 rpc_exit(task, -EAGAIN); 1385 return -EAGAIN; 1386 } 1387 1388 ff_layout_read_record_layoutstats_start(task, hdr); 1389 return 0; 1390 } 1391 1392 /* 1393 * Call ops for the async read/write cases 1394 * In the case of dense layouts, the offset needs to be reset to its 1395 * original value. 1396 */ 1397 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1398 { 1399 struct nfs_pgio_header *hdr = data; 1400 1401 if (ff_layout_read_prepare_common(task, hdr)) 1402 return; 1403 1404 rpc_call_start(task); 1405 } 1406 1407 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1408 { 1409 struct nfs_pgio_header *hdr = data; 1410 1411 if (nfs4_setup_sequence(hdr->ds_clp, 1412 &hdr->args.seq_args, 1413 &hdr->res.seq_res, 1414 task)) 1415 return; 1416 1417 ff_layout_read_prepare_common(task, hdr); 1418 } 1419 1420 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1421 { 1422 struct nfs_pgio_header *hdr = data; 1423 1424 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1425 task->tk_status == 0) { 1426 nfs4_sequence_done(task, &hdr->res.seq_res); 1427 return; 1428 } 1429 1430 /* Note this may cause RPC to be resent */ 1431 hdr->mds_ops->rpc_call_done(task, hdr); 1432 } 1433 1434 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1435 { 1436 struct nfs_pgio_header *hdr = data; 1437 1438 ff_layout_read_record_layoutstats_done(task, hdr); 1439 rpc_count_iostats_metrics(task, 1440 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1441 } 1442 1443 static void ff_layout_read_release(void *data) 1444 { 1445 struct nfs_pgio_header *hdr = data; 1446 1447 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1448 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) 1449 ff_layout_resend_pnfs_read(hdr); 1450 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1451 ff_layout_reset_read(hdr); 1452 pnfs_generic_rw_release(data); 1453 } 1454 1455 1456 static int ff_layout_write_done_cb(struct rpc_task *task, 1457 struct nfs_pgio_header *hdr) 1458 { 1459 loff_t end_offs = 0; 1460 int err; 1461 1462 if (task->tk_status < 0) { 1463 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1464 hdr->args.offset, hdr->args.count, 1465 &hdr->res.op_status, OP_WRITE, 1466 task->tk_status); 1467 trace_ff_layout_write_error(hdr); 1468 } 1469 1470 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1471 hdr->ds_clp, hdr->lseg, 1472 hdr->pgio_mirror_idx); 1473 1474 trace_nfs4_pnfs_write(hdr, err); 1475 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1476 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1477 switch (err) { 1478 case -NFS4ERR_RESET_TO_PNFS: 1479 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1480 return task->tk_status; 1481 case -NFS4ERR_RESET_TO_MDS: 1482 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1483 return task->tk_status; 1484 case -EAGAIN: 1485 return -EAGAIN; 1486 } 1487 1488 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1489 hdr->res.verf->committed == NFS_DATA_SYNC) 1490 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1491 1492 /* Note: if the write is unstable, don't set end_offs until commit */ 1493 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1494 1495 /* zero out fattr since we don't care DS attr at all */ 1496 hdr->fattr.valid = 0; 1497 if (task->tk_status >= 0) 1498 nfs_writeback_update_inode(hdr); 1499 1500 return 0; 1501 } 1502 1503 static int ff_layout_commit_done_cb(struct rpc_task *task, 1504 struct nfs_commit_data *data) 1505 { 1506 int err; 1507 1508 if (task->tk_status < 0) { 1509 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index, 1510 data->args.offset, data->args.count, 1511 &data->res.op_status, OP_COMMIT, 1512 task->tk_status); 1513 trace_ff_layout_commit_error(data); 1514 } 1515 1516 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1517 data->lseg, data->ds_commit_index); 1518 1519 trace_nfs4_pnfs_commit_ds(data, err); 1520 switch (err) { 1521 case -NFS4ERR_RESET_TO_PNFS: 1522 pnfs_generic_prepare_to_resend_writes(data); 1523 return -EAGAIN; 1524 case -NFS4ERR_RESET_TO_MDS: 1525 pnfs_generic_prepare_to_resend_writes(data); 1526 return -EAGAIN; 1527 case -EAGAIN: 1528 rpc_restart_call_prepare(task); 1529 return -EAGAIN; 1530 } 1531 1532 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1533 1534 return 0; 1535 } 1536 1537 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1538 struct nfs_pgio_header *hdr) 1539 { 1540 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1541 return; 1542 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1543 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1544 hdr->args.count, 1545 task->tk_start); 1546 } 1547 1548 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1549 struct nfs_pgio_header *hdr) 1550 { 1551 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1552 return; 1553 nfs4_ff_layout_stat_io_end_write(task, 1554 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1555 hdr->args.count, hdr->res.count, 1556 hdr->res.verf->committed); 1557 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1558 } 1559 1560 static int ff_layout_write_prepare_common(struct rpc_task *task, 1561 struct nfs_pgio_header *hdr) 1562 { 1563 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1564 rpc_exit(task, -EIO); 1565 return -EIO; 1566 } 1567 1568 if (!pnfs_is_valid_lseg(hdr->lseg)) { 1569 rpc_exit(task, -EAGAIN); 1570 return -EAGAIN; 1571 } 1572 1573 ff_layout_write_record_layoutstats_start(task, hdr); 1574 return 0; 1575 } 1576 1577 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1578 { 1579 struct nfs_pgio_header *hdr = data; 1580 1581 if (ff_layout_write_prepare_common(task, hdr)) 1582 return; 1583 1584 rpc_call_start(task); 1585 } 1586 1587 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1588 { 1589 struct nfs_pgio_header *hdr = data; 1590 1591 if (nfs4_setup_sequence(hdr->ds_clp, 1592 &hdr->args.seq_args, 1593 &hdr->res.seq_res, 1594 task)) 1595 return; 1596 1597 ff_layout_write_prepare_common(task, hdr); 1598 } 1599 1600 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1601 { 1602 struct nfs_pgio_header *hdr = data; 1603 1604 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1605 task->tk_status == 0) { 1606 nfs4_sequence_done(task, &hdr->res.seq_res); 1607 return; 1608 } 1609 1610 /* Note this may cause RPC to be resent */ 1611 hdr->mds_ops->rpc_call_done(task, hdr); 1612 } 1613 1614 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1615 { 1616 struct nfs_pgio_header *hdr = data; 1617 1618 ff_layout_write_record_layoutstats_done(task, hdr); 1619 rpc_count_iostats_metrics(task, 1620 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1621 } 1622 1623 static void ff_layout_write_release(void *data) 1624 { 1625 struct nfs_pgio_header *hdr = data; 1626 1627 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1628 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1629 ff_layout_send_layouterror(hdr->lseg); 1630 ff_layout_reset_write(hdr, true); 1631 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1632 ff_layout_reset_write(hdr, false); 1633 pnfs_generic_rw_release(data); 1634 } 1635 1636 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1637 struct nfs_commit_data *cdata) 1638 { 1639 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1640 return; 1641 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1642 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1643 0, task->tk_start); 1644 } 1645 1646 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1647 struct nfs_commit_data *cdata) 1648 { 1649 struct nfs_page *req; 1650 __u64 count = 0; 1651 1652 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1653 return; 1654 1655 if (task->tk_status == 0) { 1656 list_for_each_entry(req, &cdata->pages, wb_list) 1657 count += req->wb_bytes; 1658 } 1659 nfs4_ff_layout_stat_io_end_write(task, 1660 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1661 count, count, NFS_FILE_SYNC); 1662 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 1663 } 1664 1665 static int ff_layout_commit_prepare_common(struct rpc_task *task, 1666 struct nfs_commit_data *cdata) 1667 { 1668 if (!pnfs_is_valid_lseg(cdata->lseg)) { 1669 rpc_exit(task, -EAGAIN); 1670 return -EAGAIN; 1671 } 1672 1673 ff_layout_commit_record_layoutstats_start(task, cdata); 1674 return 0; 1675 } 1676 1677 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1678 { 1679 if (ff_layout_commit_prepare_common(task, data)) 1680 return; 1681 1682 rpc_call_start(task); 1683 } 1684 1685 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1686 { 1687 struct nfs_commit_data *wdata = data; 1688 1689 if (nfs4_setup_sequence(wdata->ds_clp, 1690 &wdata->args.seq_args, 1691 &wdata->res.seq_res, 1692 task)) 1693 return; 1694 ff_layout_commit_prepare_common(task, data); 1695 } 1696 1697 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1698 { 1699 pnfs_generic_write_commit_done(task, data); 1700 } 1701 1702 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1703 { 1704 struct nfs_commit_data *cdata = data; 1705 1706 ff_layout_commit_record_layoutstats_done(task, cdata); 1707 rpc_count_iostats_metrics(task, 1708 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1709 } 1710 1711 static void ff_layout_commit_release(void *data) 1712 { 1713 struct nfs_commit_data *cdata = data; 1714 1715 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1716 pnfs_generic_commit_release(data); 1717 } 1718 1719 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1720 .rpc_call_prepare = ff_layout_read_prepare_v3, 1721 .rpc_call_done = ff_layout_read_call_done, 1722 .rpc_count_stats = ff_layout_read_count_stats, 1723 .rpc_release = ff_layout_read_release, 1724 }; 1725 1726 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 1727 .rpc_call_prepare = ff_layout_read_prepare_v4, 1728 .rpc_call_done = ff_layout_read_call_done, 1729 .rpc_count_stats = ff_layout_read_count_stats, 1730 .rpc_release = ff_layout_read_release, 1731 }; 1732 1733 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1734 .rpc_call_prepare = ff_layout_write_prepare_v3, 1735 .rpc_call_done = ff_layout_write_call_done, 1736 .rpc_count_stats = ff_layout_write_count_stats, 1737 .rpc_release = ff_layout_write_release, 1738 }; 1739 1740 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1741 .rpc_call_prepare = ff_layout_write_prepare_v4, 1742 .rpc_call_done = ff_layout_write_call_done, 1743 .rpc_count_stats = ff_layout_write_count_stats, 1744 .rpc_release = ff_layout_write_release, 1745 }; 1746 1747 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 1748 .rpc_call_prepare = ff_layout_commit_prepare_v3, 1749 .rpc_call_done = ff_layout_commit_done, 1750 .rpc_count_stats = ff_layout_commit_count_stats, 1751 .rpc_release = ff_layout_commit_release, 1752 }; 1753 1754 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 1755 .rpc_call_prepare = ff_layout_commit_prepare_v4, 1756 .rpc_call_done = ff_layout_commit_done, 1757 .rpc_count_stats = ff_layout_commit_count_stats, 1758 .rpc_release = ff_layout_commit_release, 1759 }; 1760 1761 static enum pnfs_try_status 1762 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 1763 { 1764 struct pnfs_layout_segment *lseg = hdr->lseg; 1765 struct nfs4_pnfs_ds *ds; 1766 struct rpc_clnt *ds_clnt; 1767 struct nfs4_ff_layout_mirror *mirror; 1768 const struct cred *ds_cred; 1769 loff_t offset = hdr->args.offset; 1770 u32 idx = hdr->pgio_mirror_idx; 1771 int vers; 1772 struct nfs_fh *fh; 1773 1774 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 1775 __func__, hdr->inode->i_ino, 1776 hdr->args.pgbase, (size_t)hdr->args.count, offset); 1777 1778 mirror = FF_LAYOUT_COMP(lseg, idx); 1779 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 1780 if (!ds) 1781 goto out_failed; 1782 1783 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1784 hdr->inode); 1785 if (IS_ERR(ds_clnt)) 1786 goto out_failed; 1787 1788 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1789 if (!ds_cred) 1790 goto out_failed; 1791 1792 vers = nfs4_ff_layout_ds_version(mirror); 1793 1794 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 1795 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 1796 1797 hdr->pgio_done_cb = ff_layout_read_done_cb; 1798 refcount_inc(&ds->ds_clp->cl_count); 1799 hdr->ds_clp = ds->ds_clp; 1800 fh = nfs4_ff_layout_select_ds_fh(mirror); 1801 if (fh) 1802 hdr->args.fh = fh; 1803 1804 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1805 1806 /* 1807 * Note that if we ever decide to split across DSes, 1808 * then we may need to handle dense-like offsets. 1809 */ 1810 hdr->args.offset = offset; 1811 hdr->mds_offset = offset; 1812 1813 /* Perform an asynchronous read to ds */ 1814 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1815 vers == 3 ? &ff_layout_read_call_ops_v3 : 1816 &ff_layout_read_call_ops_v4, 1817 0, RPC_TASK_SOFTCONN); 1818 put_cred(ds_cred); 1819 return PNFS_ATTEMPTED; 1820 1821 out_failed: 1822 if (ff_layout_avoid_mds_available_ds(lseg)) 1823 return PNFS_TRY_AGAIN; 1824 trace_pnfs_mds_fallback_read_pagelist(hdr->inode, 1825 hdr->args.offset, hdr->args.count, 1826 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg); 1827 return PNFS_NOT_ATTEMPTED; 1828 } 1829 1830 /* Perform async writes. */ 1831 static enum pnfs_try_status 1832 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 1833 { 1834 struct pnfs_layout_segment *lseg = hdr->lseg; 1835 struct nfs4_pnfs_ds *ds; 1836 struct rpc_clnt *ds_clnt; 1837 struct nfs4_ff_layout_mirror *mirror; 1838 const struct cred *ds_cred; 1839 loff_t offset = hdr->args.offset; 1840 int vers; 1841 struct nfs_fh *fh; 1842 u32 idx = hdr->pgio_mirror_idx; 1843 1844 mirror = FF_LAYOUT_COMP(lseg, idx); 1845 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1846 if (!ds) 1847 goto out_failed; 1848 1849 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1850 hdr->inode); 1851 if (IS_ERR(ds_clnt)) 1852 goto out_failed; 1853 1854 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1855 if (!ds_cred) 1856 goto out_failed; 1857 1858 vers = nfs4_ff_layout_ds_version(mirror); 1859 1860 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 1861 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 1862 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 1863 vers); 1864 1865 hdr->pgio_done_cb = ff_layout_write_done_cb; 1866 refcount_inc(&ds->ds_clp->cl_count); 1867 hdr->ds_clp = ds->ds_clp; 1868 hdr->ds_commit_idx = idx; 1869 fh = nfs4_ff_layout_select_ds_fh(mirror); 1870 if (fh) 1871 hdr->args.fh = fh; 1872 1873 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1874 1875 /* 1876 * Note that if we ever decide to split across DSes, 1877 * then we may need to handle dense-like offsets. 1878 */ 1879 hdr->args.offset = offset; 1880 1881 /* Perform an asynchronous write */ 1882 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1883 vers == 3 ? &ff_layout_write_call_ops_v3 : 1884 &ff_layout_write_call_ops_v4, 1885 sync, RPC_TASK_SOFTCONN); 1886 put_cred(ds_cred); 1887 return PNFS_ATTEMPTED; 1888 1889 out_failed: 1890 if (ff_layout_avoid_mds_available_ds(lseg)) 1891 return PNFS_TRY_AGAIN; 1892 trace_pnfs_mds_fallback_write_pagelist(hdr->inode, 1893 hdr->args.offset, hdr->args.count, 1894 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg); 1895 return PNFS_NOT_ATTEMPTED; 1896 } 1897 1898 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1899 { 1900 return i; 1901 } 1902 1903 static struct nfs_fh * 1904 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1905 { 1906 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1907 1908 /* FIXME: Assume that there is only one NFS version available 1909 * for the DS. 1910 */ 1911 return &flseg->mirror_array[i]->fh_versions[0]; 1912 } 1913 1914 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 1915 { 1916 struct pnfs_layout_segment *lseg = data->lseg; 1917 struct nfs4_pnfs_ds *ds; 1918 struct rpc_clnt *ds_clnt; 1919 struct nfs4_ff_layout_mirror *mirror; 1920 const struct cred *ds_cred; 1921 u32 idx; 1922 int vers, ret; 1923 struct nfs_fh *fh; 1924 1925 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 1926 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 1927 goto out_err; 1928 1929 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1930 mirror = FF_LAYOUT_COMP(lseg, idx); 1931 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1932 if (!ds) 1933 goto out_err; 1934 1935 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1936 data->inode); 1937 if (IS_ERR(ds_clnt)) 1938 goto out_err; 1939 1940 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred); 1941 if (!ds_cred) 1942 goto out_err; 1943 1944 vers = nfs4_ff_layout_ds_version(mirror); 1945 1946 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 1947 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 1948 vers); 1949 data->commit_done_cb = ff_layout_commit_done_cb; 1950 data->cred = ds_cred; 1951 refcount_inc(&ds->ds_clp->cl_count); 1952 data->ds_clp = ds->ds_clp; 1953 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1954 if (fh) 1955 data->args.fh = fh; 1956 1957 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 1958 vers == 3 ? &ff_layout_commit_call_ops_v3 : 1959 &ff_layout_commit_call_ops_v4, 1960 how, RPC_TASK_SOFTCONN); 1961 put_cred(ds_cred); 1962 return ret; 1963 out_err: 1964 pnfs_generic_prepare_to_resend_writes(data); 1965 pnfs_generic_commit_release(data); 1966 return -EAGAIN; 1967 } 1968 1969 static int 1970 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1971 int how, struct nfs_commit_info *cinfo) 1972 { 1973 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1974 ff_layout_initiate_commit); 1975 } 1976 1977 static bool ff_layout_match_rw(const struct rpc_task *task, 1978 const struct nfs_pgio_header *hdr, 1979 const struct pnfs_layout_segment *lseg) 1980 { 1981 return hdr->lseg == lseg; 1982 } 1983 1984 static bool ff_layout_match_commit(const struct rpc_task *task, 1985 const struct nfs_commit_data *cdata, 1986 const struct pnfs_layout_segment *lseg) 1987 { 1988 return cdata->lseg == lseg; 1989 } 1990 1991 static bool ff_layout_match_io(const struct rpc_task *task, const void *data) 1992 { 1993 const struct rpc_call_ops *ops = task->tk_ops; 1994 1995 if (ops == &ff_layout_read_call_ops_v3 || 1996 ops == &ff_layout_read_call_ops_v4 || 1997 ops == &ff_layout_write_call_ops_v3 || 1998 ops == &ff_layout_write_call_ops_v4) 1999 return ff_layout_match_rw(task, task->tk_calldata, data); 2000 if (ops == &ff_layout_commit_call_ops_v3 || 2001 ops == &ff_layout_commit_call_ops_v4) 2002 return ff_layout_match_commit(task, task->tk_calldata, data); 2003 return false; 2004 } 2005 2006 static void ff_layout_cancel_io(struct pnfs_layout_segment *lseg) 2007 { 2008 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 2009 struct nfs4_ff_layout_mirror *mirror; 2010 struct nfs4_ff_layout_ds *mirror_ds; 2011 struct nfs4_pnfs_ds *ds; 2012 struct nfs_client *ds_clp; 2013 struct rpc_clnt *clnt; 2014 u32 idx; 2015 2016 for (idx = 0; idx < flseg->mirror_array_cnt; idx++) { 2017 mirror = flseg->mirror_array[idx]; 2018 mirror_ds = mirror->mirror_ds; 2019 if (!mirror_ds) 2020 continue; 2021 ds = mirror->mirror_ds->ds; 2022 if (!ds) 2023 continue; 2024 ds_clp = ds->ds_clp; 2025 if (!ds_clp) 2026 continue; 2027 clnt = ds_clp->cl_rpcclient; 2028 if (!clnt) 2029 continue; 2030 if (!rpc_cancel_tasks(clnt, -EAGAIN, ff_layout_match_io, lseg)) 2031 continue; 2032 rpc_clnt_disconnect(clnt); 2033 } 2034 } 2035 2036 static struct pnfs_ds_commit_info * 2037 ff_layout_get_ds_info(struct inode *inode) 2038 { 2039 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 2040 2041 if (layout == NULL) 2042 return NULL; 2043 2044 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 2045 } 2046 2047 static void 2048 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 2049 struct pnfs_layout_segment *lseg) 2050 { 2051 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 2052 struct inode *inode = lseg->pls_layout->plh_inode; 2053 struct pnfs_commit_array *array, *new; 2054 2055 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt, 2056 nfs_io_gfp_mask()); 2057 if (new) { 2058 spin_lock(&inode->i_lock); 2059 array = pnfs_add_commit_array(fl_cinfo, new, lseg); 2060 spin_unlock(&inode->i_lock); 2061 if (array != new) 2062 pnfs_free_commit_array(new); 2063 } 2064 } 2065 2066 static void 2067 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 2068 struct inode *inode) 2069 { 2070 spin_lock(&inode->i_lock); 2071 pnfs_generic_ds_cinfo_destroy(fl_cinfo); 2072 spin_unlock(&inode->i_lock); 2073 } 2074 2075 static void 2076 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 2077 { 2078 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 2079 id_node)); 2080 } 2081 2082 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 2083 const struct nfs4_layoutreturn_args *args, 2084 const struct nfs4_flexfile_layoutreturn_args *ff_args) 2085 { 2086 __be32 *start; 2087 2088 start = xdr_reserve_space(xdr, 4); 2089 if (unlikely(!start)) 2090 return -E2BIG; 2091 2092 *start = cpu_to_be32(ff_args->num_errors); 2093 /* This assume we always return _ALL_ layouts */ 2094 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 2095 } 2096 2097 static void 2098 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len) 2099 { 2100 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0); 2101 } 2102 2103 static void 2104 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 2105 const nfs4_stateid *stateid, 2106 const struct nfs42_layoutstat_devinfo *devinfo) 2107 { 2108 __be32 *p; 2109 2110 p = xdr_reserve_space(xdr, 8 + 8); 2111 p = xdr_encode_hyper(p, devinfo->offset); 2112 p = xdr_encode_hyper(p, devinfo->length); 2113 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 2114 p = xdr_reserve_space(xdr, 4*8); 2115 p = xdr_encode_hyper(p, devinfo->read_count); 2116 p = xdr_encode_hyper(p, devinfo->read_bytes); 2117 p = xdr_encode_hyper(p, devinfo->write_count); 2118 p = xdr_encode_hyper(p, devinfo->write_bytes); 2119 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 2120 } 2121 2122 static void 2123 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 2124 const nfs4_stateid *stateid, 2125 const struct nfs42_layoutstat_devinfo *devinfo) 2126 { 2127 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 2128 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 2129 devinfo->ld_private.data); 2130 } 2131 2132 /* report nothing for now */ 2133 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 2134 const struct nfs4_layoutreturn_args *args, 2135 struct nfs4_flexfile_layoutreturn_args *ff_args) 2136 { 2137 __be32 *p; 2138 int i; 2139 2140 p = xdr_reserve_space(xdr, 4); 2141 *p = cpu_to_be32(ff_args->num_dev); 2142 for (i = 0; i < ff_args->num_dev; i++) 2143 ff_layout_encode_ff_iostat(xdr, 2144 &args->layout->plh_stateid, 2145 &ff_args->devinfo[i]); 2146 } 2147 2148 static void 2149 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 2150 unsigned int num_entries) 2151 { 2152 unsigned int i; 2153 2154 for (i = 0; i < num_entries; i++) { 2155 if (!devinfo[i].ld_private.ops) 2156 continue; 2157 if (!devinfo[i].ld_private.ops->free) 2158 continue; 2159 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 2160 } 2161 } 2162 2163 static struct nfs4_deviceid_node * 2164 ff_layout_alloc_deviceid_node(struct nfs_server *server, 2165 struct pnfs_device *pdev, gfp_t gfp_flags) 2166 { 2167 struct nfs4_ff_layout_ds *dsaddr; 2168 2169 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2170 if (!dsaddr) 2171 return NULL; 2172 return &dsaddr->id_node; 2173 } 2174 2175 static void 2176 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2177 const void *voidargs, 2178 const struct nfs4_xdr_opaque_data *ff_opaque) 2179 { 2180 const struct nfs4_layoutreturn_args *args = voidargs; 2181 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2182 struct xdr_buf tmp_buf = { 2183 .head = { 2184 [0] = { 2185 .iov_base = page_address(ff_args->pages[0]), 2186 }, 2187 }, 2188 .buflen = PAGE_SIZE, 2189 }; 2190 struct xdr_stream tmp_xdr; 2191 __be32 *start; 2192 2193 dprintk("%s: Begin\n", __func__); 2194 2195 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL); 2196 2197 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2198 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2199 2200 start = xdr_reserve_space(xdr, 4); 2201 *start = cpu_to_be32(tmp_buf.len); 2202 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2203 2204 dprintk("%s: Return\n", __func__); 2205 } 2206 2207 static void 2208 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2209 { 2210 struct nfs4_flexfile_layoutreturn_args *ff_args; 2211 2212 if (!args->data) 2213 return; 2214 ff_args = args->data; 2215 args->data = NULL; 2216 2217 ff_layout_free_ds_ioerr(&ff_args->errors); 2218 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2219 2220 put_page(ff_args->pages[0]); 2221 kfree(ff_args); 2222 } 2223 2224 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2225 .encode = ff_layout_encode_layoutreturn, 2226 .free = ff_layout_free_layoutreturn, 2227 }; 2228 2229 static int 2230 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2231 { 2232 struct nfs4_flexfile_layoutreturn_args *ff_args; 2233 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2234 2235 ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask()); 2236 if (!ff_args) 2237 goto out_nomem; 2238 ff_args->pages[0] = alloc_page(nfs_io_gfp_mask()); 2239 if (!ff_args->pages[0]) 2240 goto out_nomem_free; 2241 2242 INIT_LIST_HEAD(&ff_args->errors); 2243 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2244 &args->range, &ff_args->errors, 2245 FF_LAYOUTRETURN_MAXERR); 2246 2247 spin_lock(&args->inode->i_lock); 2248 ff_args->num_dev = ff_layout_mirror_prepare_stats( 2249 &ff_layout->generic_hdr, &ff_args->devinfo[0], 2250 ARRAY_SIZE(ff_args->devinfo), NFS4_FF_OP_LAYOUTRETURN); 2251 spin_unlock(&args->inode->i_lock); 2252 2253 args->ld_private->ops = &layoutreturn_ops; 2254 args->ld_private->data = ff_args; 2255 return 0; 2256 out_nomem_free: 2257 kfree(ff_args); 2258 out_nomem: 2259 return -ENOMEM; 2260 } 2261 2262 #ifdef CONFIG_NFS_V4_2 2263 void 2264 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2265 { 2266 struct pnfs_layout_hdr *lo = lseg->pls_layout; 2267 struct nfs42_layout_error *errors; 2268 LIST_HEAD(head); 2269 2270 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) 2271 return; 2272 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); 2273 if (list_empty(&head)) 2274 return; 2275 2276 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors), 2277 nfs_io_gfp_mask()); 2278 if (errors != NULL) { 2279 const struct nfs4_ff_layout_ds_err *pos; 2280 size_t n = 0; 2281 2282 list_for_each_entry(pos, &head, list) { 2283 errors[n].offset = pos->offset; 2284 errors[n].length = pos->length; 2285 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); 2286 errors[n].errors[0].dev_id = pos->deviceid; 2287 errors[n].errors[0].status = pos->status; 2288 errors[n].errors[0].opnum = pos->opnum; 2289 n++; 2290 if (!list_is_last(&pos->list, &head) && 2291 n < NFS42_LAYOUTERROR_MAX) 2292 continue; 2293 if (nfs42_proc_layouterror(lseg, errors, n) < 0) 2294 break; 2295 n = 0; 2296 } 2297 kfree(errors); 2298 } 2299 ff_layout_free_ds_ioerr(&head); 2300 } 2301 #else 2302 void 2303 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2304 { 2305 } 2306 #endif 2307 2308 static int 2309 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2310 { 2311 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2312 2313 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2314 } 2315 2316 static size_t 2317 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2318 const int buflen) 2319 { 2320 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2321 const struct in6_addr *addr = &sin6->sin6_addr; 2322 2323 /* 2324 * RFC 4291, Section 2.2.2 2325 * 2326 * Shorthanded ANY address 2327 */ 2328 if (ipv6_addr_any(addr)) 2329 return snprintf(buf, buflen, "::"); 2330 2331 /* 2332 * RFC 4291, Section 2.2.2 2333 * 2334 * Shorthanded loopback address 2335 */ 2336 if (ipv6_addr_loopback(addr)) 2337 return snprintf(buf, buflen, "::1"); 2338 2339 /* 2340 * RFC 4291, Section 2.2.3 2341 * 2342 * Special presentation address format for mapped v4 2343 * addresses. 2344 */ 2345 if (ipv6_addr_v4mapped(addr)) 2346 return snprintf(buf, buflen, "::ffff:%pI4", 2347 &addr->s6_addr32[3]); 2348 2349 /* 2350 * RFC 4291, Section 2.2.1 2351 */ 2352 return snprintf(buf, buflen, "%pI6c", addr); 2353 } 2354 2355 /* Derived from rpc_sockaddr2uaddr */ 2356 static void 2357 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2358 { 2359 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2360 char portbuf[RPCBIND_MAXUADDRPLEN]; 2361 char addrbuf[RPCBIND_MAXUADDRLEN]; 2362 unsigned short port; 2363 int len, netid_len; 2364 __be32 *p; 2365 2366 switch (sap->sa_family) { 2367 case AF_INET: 2368 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2369 return; 2370 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2371 break; 2372 case AF_INET6: 2373 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2374 return; 2375 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2376 break; 2377 default: 2378 WARN_ON_ONCE(1); 2379 return; 2380 } 2381 2382 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2383 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2384 2385 netid_len = strlen(da->da_netid); 2386 p = xdr_reserve_space(xdr, 4 + netid_len); 2387 xdr_encode_opaque(p, da->da_netid, netid_len); 2388 2389 p = xdr_reserve_space(xdr, 4 + len); 2390 xdr_encode_opaque(p, addrbuf, len); 2391 } 2392 2393 static void 2394 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2395 ktime_t t) 2396 { 2397 struct timespec64 ts; 2398 __be32 *p; 2399 2400 p = xdr_reserve_space(xdr, 12); 2401 ts = ktime_to_timespec64(t); 2402 p = xdr_encode_hyper(p, ts.tv_sec); 2403 *p++ = cpu_to_be32(ts.tv_nsec); 2404 } 2405 2406 static void 2407 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2408 struct nfs4_ff_io_stat *stat) 2409 { 2410 __be32 *p; 2411 2412 p = xdr_reserve_space(xdr, 5 * 8); 2413 p = xdr_encode_hyper(p, stat->ops_requested); 2414 p = xdr_encode_hyper(p, stat->bytes_requested); 2415 p = xdr_encode_hyper(p, stat->ops_completed); 2416 p = xdr_encode_hyper(p, stat->bytes_completed); 2417 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2418 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2419 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2420 } 2421 2422 static void 2423 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2424 const struct nfs42_layoutstat_devinfo *devinfo, 2425 struct nfs4_ff_layout_mirror *mirror) 2426 { 2427 struct nfs4_pnfs_ds_addr *da; 2428 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds; 2429 struct nfs_fh *fh = &mirror->fh_versions[0]; 2430 __be32 *p; 2431 2432 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2433 dprintk("%s: DS %s: encoding address %s\n", 2434 __func__, ds->ds_remotestr, da->da_remotestr); 2435 /* netaddr4 */ 2436 ff_layout_encode_netaddr(xdr, da); 2437 /* nfs_fh4 */ 2438 p = xdr_reserve_space(xdr, 4 + fh->size); 2439 xdr_encode_opaque(p, fh->data, fh->size); 2440 /* ff_io_latency4 read */ 2441 spin_lock(&mirror->lock); 2442 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat); 2443 /* ff_io_latency4 write */ 2444 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat); 2445 spin_unlock(&mirror->lock); 2446 /* nfstime4 */ 2447 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time)); 2448 /* bool */ 2449 p = xdr_reserve_space(xdr, 4); 2450 *p = cpu_to_be32(false); 2451 } 2452 2453 static void 2454 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2455 const struct nfs4_xdr_opaque_data *opaque) 2456 { 2457 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2458 struct nfs42_layoutstat_devinfo, ld_private); 2459 __be32 *start; 2460 2461 /* layoutupdate length */ 2462 start = xdr_reserve_space(xdr, 4); 2463 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2464 2465 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2466 } 2467 2468 static void 2469 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2470 { 2471 struct nfs4_ff_layout_mirror *mirror = opaque->data; 2472 2473 ff_layout_put_mirror(mirror); 2474 } 2475 2476 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2477 .encode = ff_layout_encode_layoutstats, 2478 .free = ff_layout_free_layoutstats, 2479 }; 2480 2481 static int 2482 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2483 struct nfs42_layoutstat_devinfo *devinfo, 2484 int dev_limit, enum nfs4_ff_op_type type) 2485 { 2486 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2487 struct nfs4_ff_layout_mirror *mirror; 2488 struct nfs4_deviceid_node *dev; 2489 int i = 0; 2490 2491 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2492 if (i >= dev_limit) 2493 break; 2494 if (IS_ERR_OR_NULL(mirror->mirror_ds)) 2495 continue; 2496 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, 2497 &mirror->flags) && 2498 type != NFS4_FF_OP_LAYOUTRETURN) 2499 continue; 2500 /* mirror refcount put in cleanup_layoutstats */ 2501 if (!refcount_inc_not_zero(&mirror->ref)) 2502 continue; 2503 dev = &mirror->mirror_ds->id_node; 2504 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE); 2505 devinfo->offset = 0; 2506 devinfo->length = NFS4_MAX_UINT64; 2507 spin_lock(&mirror->lock); 2508 devinfo->read_count = mirror->read_stat.io_stat.ops_completed; 2509 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed; 2510 devinfo->write_count = mirror->write_stat.io_stat.ops_completed; 2511 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed; 2512 spin_unlock(&mirror->lock); 2513 devinfo->layout_type = LAYOUT_FLEX_FILES; 2514 devinfo->ld_private.ops = &layoutstat_ops; 2515 devinfo->ld_private.data = mirror; 2516 2517 devinfo++; 2518 i++; 2519 } 2520 return i; 2521 } 2522 2523 static int 2524 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2525 { 2526 struct nfs4_flexfile_layout *ff_layout; 2527 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2528 2529 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2530 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), 2531 nfs_io_gfp_mask()); 2532 if (!args->devinfo) 2533 return -ENOMEM; 2534 2535 spin_lock(&args->inode->i_lock); 2536 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout); 2537 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2538 &args->devinfo[0], 2539 dev_count, 2540 NFS4_FF_OP_LAYOUTSTATS); 2541 spin_unlock(&args->inode->i_lock); 2542 if (!args->num_dev) { 2543 kfree(args->devinfo); 2544 args->devinfo = NULL; 2545 return -ENOENT; 2546 } 2547 2548 return 0; 2549 } 2550 2551 static int 2552 ff_layout_set_layoutdriver(struct nfs_server *server, 2553 const struct nfs_fh *dummy) 2554 { 2555 #if IS_ENABLED(CONFIG_NFS_V4_2) 2556 server->caps |= NFS_CAP_LAYOUTSTATS; 2557 #endif 2558 return 0; 2559 } 2560 2561 static const struct pnfs_commit_ops ff_layout_commit_ops = { 2562 .setup_ds_info = ff_layout_setup_ds_info, 2563 .release_ds_info = ff_layout_release_ds_info, 2564 .mark_request_commit = pnfs_layout_mark_request_commit, 2565 .clear_request_commit = pnfs_generic_clear_request_commit, 2566 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2567 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2568 .commit_pagelist = ff_layout_commit_pagelist, 2569 }; 2570 2571 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2572 .id = LAYOUT_FLEX_FILES, 2573 .name = "LAYOUT_FLEX_FILES", 2574 .owner = THIS_MODULE, 2575 .flags = PNFS_LAYOUTGET_ON_OPEN, 2576 .max_layoutget_response = 4096, /* 1 page or so... */ 2577 .set_layoutdriver = ff_layout_set_layoutdriver, 2578 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2579 .free_layout_hdr = ff_layout_free_layout_hdr, 2580 .alloc_lseg = ff_layout_alloc_lseg, 2581 .free_lseg = ff_layout_free_lseg, 2582 .add_lseg = ff_layout_add_lseg, 2583 .pg_read_ops = &ff_layout_pg_read_ops, 2584 .pg_write_ops = &ff_layout_pg_write_ops, 2585 .get_ds_info = ff_layout_get_ds_info, 2586 .free_deviceid_node = ff_layout_free_deviceid_node, 2587 .read_pagelist = ff_layout_read_pagelist, 2588 .write_pagelist = ff_layout_write_pagelist, 2589 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 2590 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 2591 .sync = pnfs_nfs_generic_sync, 2592 .prepare_layoutstats = ff_layout_prepare_layoutstats, 2593 .cancel_io = ff_layout_cancel_io, 2594 }; 2595 2596 static int __init nfs4flexfilelayout_init(void) 2597 { 2598 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 2599 __func__); 2600 return pnfs_register_layoutdriver(&flexfilelayout_type); 2601 } 2602 2603 static void __exit nfs4flexfilelayout_exit(void) 2604 { 2605 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 2606 __func__); 2607 pnfs_unregister_layoutdriver(&flexfilelayout_type); 2608 } 2609 2610 MODULE_ALIAS("nfs-layouttype4-4"); 2611 2612 MODULE_LICENSE("GPL"); 2613 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 2614 2615 module_init(nfs4flexfilelayout_init); 2616 module_exit(nfs4flexfilelayout_exit); 2617 2618 module_param(io_maxretrans, ushort, 0644); 2619 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client " 2620 "retries an I/O request before returning an error. "); 2621