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_init_read(struct nfs_pageio_descriptor *pgio, 827 struct nfs_page *req) 828 { 829 struct nfs_pgio_mirror *pgm; 830 struct nfs4_ff_layout_mirror *mirror; 831 struct nfs4_pnfs_ds *ds; 832 u32 ds_idx; 833 834 retry: 835 pnfs_generic_pg_check_layout(pgio, req); 836 /* Use full layout for now */ 837 if (!pgio->pg_lseg) { 838 ff_layout_pg_get_read(pgio, req, false); 839 if (!pgio->pg_lseg) 840 goto out_nolseg; 841 } 842 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 843 ff_layout_pg_get_read(pgio, req, true); 844 if (!pgio->pg_lseg) 845 goto out_nolseg; 846 } 847 848 ds = ff_layout_get_ds_for_read(pgio, &ds_idx); 849 if (!ds) { 850 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 851 goto out_mds; 852 pnfs_generic_pg_cleanup(pgio); 853 /* Sleep for 1 second before retrying */ 854 ssleep(1); 855 goto retry; 856 } 857 858 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 859 pgm = &pgio->pg_mirrors[0]; 860 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; 861 862 pgio->pg_mirror_idx = ds_idx; 863 864 if (NFS_SERVER(pgio->pg_inode)->flags & 865 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 866 pgio->pg_maxretrans = io_maxretrans; 867 return; 868 out_nolseg: 869 if (pgio->pg_error < 0) 870 return; 871 out_mds: 872 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode, 873 0, NFS4_MAX_UINT64, IOMODE_READ, 874 NFS_I(pgio->pg_inode)->layout, 875 pgio->pg_lseg); 876 pgio->pg_maxretrans = 0; 877 nfs_pageio_reset_read_mds(pgio); 878 } 879 880 static void 881 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 882 struct nfs_page *req) 883 { 884 struct nfs4_ff_layout_mirror *mirror; 885 struct nfs_pgio_mirror *pgm; 886 struct nfs4_pnfs_ds *ds; 887 u32 i; 888 889 retry: 890 pnfs_generic_pg_check_layout(pgio, req); 891 if (!pgio->pg_lseg) { 892 pgio->pg_lseg = 893 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 894 req_offset(req), req->wb_bytes, 895 IOMODE_RW, false, nfs_io_gfp_mask()); 896 if (IS_ERR(pgio->pg_lseg)) { 897 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 898 pgio->pg_lseg = NULL; 899 return; 900 } 901 } 902 /* If no lseg, fall back to write through mds */ 903 if (pgio->pg_lseg == NULL) 904 goto out_mds; 905 906 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 907 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)) 908 goto out_eagain; 909 910 for (i = 0; i < pgio->pg_mirror_count; i++) { 911 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 912 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true); 913 if (!ds) { 914 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 915 goto out_mds; 916 pnfs_generic_pg_cleanup(pgio); 917 /* Sleep for 1 second before retrying */ 918 ssleep(1); 919 goto retry; 920 } 921 pgm = &pgio->pg_mirrors[i]; 922 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize; 923 } 924 925 if (NFS_SERVER(pgio->pg_inode)->flags & 926 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 927 pgio->pg_maxretrans = io_maxretrans; 928 return; 929 out_eagain: 930 pnfs_generic_pg_cleanup(pgio); 931 pgio->pg_error = -EAGAIN; 932 return; 933 out_mds: 934 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode, 935 0, NFS4_MAX_UINT64, IOMODE_RW, 936 NFS_I(pgio->pg_inode)->layout, 937 pgio->pg_lseg); 938 pgio->pg_maxretrans = 0; 939 nfs_pageio_reset_write_mds(pgio); 940 pgio->pg_error = -EAGAIN; 941 } 942 943 static unsigned int 944 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 945 struct nfs_page *req) 946 { 947 if (!pgio->pg_lseg) { 948 pgio->pg_lseg = 949 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 950 req_offset(req), req->wb_bytes, 951 IOMODE_RW, false, nfs_io_gfp_mask()); 952 if (IS_ERR(pgio->pg_lseg)) { 953 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 954 pgio->pg_lseg = NULL; 955 goto out; 956 } 957 } 958 if (pgio->pg_lseg) 959 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 960 961 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode, 962 0, NFS4_MAX_UINT64, IOMODE_RW, 963 NFS_I(pgio->pg_inode)->layout, 964 pgio->pg_lseg); 965 /* no lseg means that pnfs is not in use, so no mirroring here */ 966 nfs_pageio_reset_write_mds(pgio); 967 out: 968 return 1; 969 } 970 971 static u32 972 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 973 { 974 u32 old = desc->pg_mirror_idx; 975 976 desc->pg_mirror_idx = idx; 977 return old; 978 } 979 980 static struct nfs_pgio_mirror * 981 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 982 { 983 return &desc->pg_mirrors[idx]; 984 } 985 986 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 987 .pg_init = ff_layout_pg_init_read, 988 .pg_test = pnfs_generic_pg_test, 989 .pg_doio = pnfs_generic_pg_readpages, 990 .pg_cleanup = pnfs_generic_pg_cleanup, 991 }; 992 993 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 994 .pg_init = ff_layout_pg_init_write, 995 .pg_test = pnfs_generic_pg_test, 996 .pg_doio = pnfs_generic_pg_writepages, 997 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 998 .pg_cleanup = pnfs_generic_pg_cleanup, 999 .pg_get_mirror = ff_layout_pg_get_mirror_write, 1000 .pg_set_mirror = ff_layout_pg_set_mirror_write, 1001 }; 1002 1003 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 1004 { 1005 struct rpc_task *task = &hdr->task; 1006 1007 pnfs_layoutcommit_inode(hdr->inode, false); 1008 1009 if (retry_pnfs) { 1010 dprintk("%s Reset task %5u for i/o through pNFS " 1011 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1012 hdr->task.tk_pid, 1013 hdr->inode->i_sb->s_id, 1014 (unsigned long long)NFS_FILEID(hdr->inode), 1015 hdr->args.count, 1016 (unsigned long long)hdr->args.offset); 1017 1018 hdr->completion_ops->reschedule_io(hdr); 1019 return; 1020 } 1021 1022 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1023 dprintk("%s Reset task %5u for i/o through MDS " 1024 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1025 hdr->task.tk_pid, 1026 hdr->inode->i_sb->s_id, 1027 (unsigned long long)NFS_FILEID(hdr->inode), 1028 hdr->args.count, 1029 (unsigned long long)hdr->args.offset); 1030 1031 trace_pnfs_mds_fallback_write_done(hdr->inode, 1032 hdr->args.offset, hdr->args.count, 1033 IOMODE_RW, NFS_I(hdr->inode)->layout, 1034 hdr->lseg); 1035 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1036 } 1037 } 1038 1039 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr) 1040 { 1041 u32 idx = hdr->pgio_mirror_idx + 1; 1042 u32 new_idx = 0; 1043 1044 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx)) 1045 ff_layout_send_layouterror(hdr->lseg); 1046 else 1047 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1048 pnfs_read_resend_pnfs(hdr, new_idx); 1049 } 1050 1051 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1052 { 1053 struct rpc_task *task = &hdr->task; 1054 1055 pnfs_layoutcommit_inode(hdr->inode, false); 1056 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1057 1058 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1059 dprintk("%s Reset task %5u for i/o through MDS " 1060 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1061 hdr->task.tk_pid, 1062 hdr->inode->i_sb->s_id, 1063 (unsigned long long)NFS_FILEID(hdr->inode), 1064 hdr->args.count, 1065 (unsigned long long)hdr->args.offset); 1066 1067 trace_pnfs_mds_fallback_read_done(hdr->inode, 1068 hdr->args.offset, hdr->args.count, 1069 IOMODE_READ, NFS_I(hdr->inode)->layout, 1070 hdr->lseg); 1071 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1072 } 1073 } 1074 1075 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1076 struct nfs4_state *state, 1077 struct nfs_client *clp, 1078 struct pnfs_layout_segment *lseg, 1079 u32 idx) 1080 { 1081 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1082 struct inode *inode = lo->plh_inode; 1083 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1084 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1085 1086 switch (task->tk_status) { 1087 case -NFS4ERR_BADSESSION: 1088 case -NFS4ERR_BADSLOT: 1089 case -NFS4ERR_BAD_HIGH_SLOT: 1090 case -NFS4ERR_DEADSESSION: 1091 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1092 case -NFS4ERR_SEQ_FALSE_RETRY: 1093 case -NFS4ERR_SEQ_MISORDERED: 1094 dprintk("%s ERROR %d, Reset session. Exchangeid " 1095 "flags 0x%x\n", __func__, task->tk_status, 1096 clp->cl_exchange_flags); 1097 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1098 break; 1099 case -NFS4ERR_DELAY: 1100 case -NFS4ERR_GRACE: 1101 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1102 break; 1103 case -NFS4ERR_RETRY_UNCACHED_REP: 1104 break; 1105 /* Invalidate Layout errors */ 1106 case -NFS4ERR_PNFS_NO_LAYOUT: 1107 case -ESTALE: /* mapped NFS4ERR_STALE */ 1108 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 1109 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 1110 case -NFS4ERR_FHEXPIRED: 1111 case -NFS4ERR_WRONG_TYPE: 1112 dprintk("%s Invalid layout error %d\n", __func__, 1113 task->tk_status); 1114 /* 1115 * Destroy layout so new i/o will get a new layout. 1116 * Layout will not be destroyed until all current lseg 1117 * references are put. Mark layout as invalid to resend failed 1118 * i/o and all i/o waiting on the slot table to the MDS until 1119 * layout is destroyed and a new valid layout is obtained. 1120 */ 1121 pnfs_destroy_layout(NFS_I(inode)); 1122 rpc_wake_up(&tbl->slot_tbl_waitq); 1123 goto reset; 1124 /* RPC connection errors */ 1125 case -ECONNREFUSED: 1126 case -EHOSTDOWN: 1127 case -EHOSTUNREACH: 1128 case -ENETUNREACH: 1129 case -EIO: 1130 case -ETIMEDOUT: 1131 case -EPIPE: 1132 case -EPROTO: 1133 case -ENODEV: 1134 dprintk("%s DS connection error %d\n", __func__, 1135 task->tk_status); 1136 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1137 &devid->deviceid); 1138 rpc_wake_up(&tbl->slot_tbl_waitq); 1139 fallthrough; 1140 default: 1141 if (ff_layout_avoid_mds_available_ds(lseg)) 1142 return -NFS4ERR_RESET_TO_PNFS; 1143 reset: 1144 dprintk("%s Retry through MDS. Error %d\n", __func__, 1145 task->tk_status); 1146 return -NFS4ERR_RESET_TO_MDS; 1147 } 1148 task->tk_status = 0; 1149 return -EAGAIN; 1150 } 1151 1152 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1153 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1154 struct pnfs_layout_segment *lseg, 1155 u32 idx) 1156 { 1157 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1158 1159 switch (task->tk_status) { 1160 /* File access problems. Don't mark the device as unavailable */ 1161 case -EACCES: 1162 case -ESTALE: 1163 case -EISDIR: 1164 case -EBADHANDLE: 1165 case -ELOOP: 1166 case -ENOSPC: 1167 break; 1168 case -EJUKEBOX: 1169 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1170 goto out_retry; 1171 default: 1172 dprintk("%s DS connection error %d\n", __func__, 1173 task->tk_status); 1174 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1175 &devid->deviceid); 1176 } 1177 /* FIXME: Need to prevent infinite looping here. */ 1178 return -NFS4ERR_RESET_TO_PNFS; 1179 out_retry: 1180 task->tk_status = 0; 1181 rpc_restart_call_prepare(task); 1182 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1183 return -EAGAIN; 1184 } 1185 1186 static int ff_layout_async_handle_error(struct rpc_task *task, 1187 struct nfs4_state *state, 1188 struct nfs_client *clp, 1189 struct pnfs_layout_segment *lseg, 1190 u32 idx) 1191 { 1192 int vers = clp->cl_nfs_mod->rpc_vers->number; 1193 1194 if (task->tk_status >= 0) { 1195 ff_layout_mark_ds_reachable(lseg, idx); 1196 return 0; 1197 } 1198 1199 /* Handle the case of an invalid layout segment */ 1200 if (!pnfs_is_valid_lseg(lseg)) 1201 return -NFS4ERR_RESET_TO_PNFS; 1202 1203 switch (vers) { 1204 case 3: 1205 return ff_layout_async_handle_error_v3(task, lseg, idx); 1206 case 4: 1207 return ff_layout_async_handle_error_v4(task, state, clp, 1208 lseg, idx); 1209 default: 1210 /* should never happen */ 1211 WARN_ON_ONCE(1); 1212 return 0; 1213 } 1214 } 1215 1216 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1217 u32 idx, u64 offset, u64 length, 1218 u32 *op_status, int opnum, int error) 1219 { 1220 struct nfs4_ff_layout_mirror *mirror; 1221 u32 status = *op_status; 1222 int err; 1223 1224 if (status == 0) { 1225 switch (error) { 1226 case -ETIMEDOUT: 1227 case -EPFNOSUPPORT: 1228 case -EPROTONOSUPPORT: 1229 case -EOPNOTSUPP: 1230 case -EINVAL: 1231 case -ECONNREFUSED: 1232 case -ECONNRESET: 1233 case -EHOSTDOWN: 1234 case -EHOSTUNREACH: 1235 case -ENETUNREACH: 1236 case -EADDRINUSE: 1237 case -ENOBUFS: 1238 case -EPIPE: 1239 case -EPERM: 1240 case -EPROTO: 1241 case -ENODEV: 1242 *op_status = status = NFS4ERR_NXIO; 1243 break; 1244 case -EACCES: 1245 *op_status = status = NFS4ERR_ACCESS; 1246 break; 1247 default: 1248 return; 1249 } 1250 } 1251 1252 mirror = FF_LAYOUT_COMP(lseg, idx); 1253 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1254 mirror, offset, length, status, opnum, 1255 nfs_io_gfp_mask()); 1256 1257 switch (status) { 1258 case NFS4ERR_DELAY: 1259 case NFS4ERR_GRACE: 1260 break; 1261 case NFS4ERR_NXIO: 1262 ff_layout_mark_ds_unreachable(lseg, idx); 1263 /* 1264 * Don't return the layout if this is a read and we still 1265 * have layouts to try 1266 */ 1267 if (opnum == OP_READ) 1268 break; 1269 fallthrough; 1270 default: 1271 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, 1272 lseg); 1273 } 1274 1275 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1276 } 1277 1278 /* NFS_PROTO call done callback routines */ 1279 static int ff_layout_read_done_cb(struct rpc_task *task, 1280 struct nfs_pgio_header *hdr) 1281 { 1282 int err; 1283 1284 if (task->tk_status < 0) { 1285 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1286 hdr->args.offset, hdr->args.count, 1287 &hdr->res.op_status, OP_READ, 1288 task->tk_status); 1289 trace_ff_layout_read_error(hdr); 1290 } 1291 1292 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1293 hdr->ds_clp, hdr->lseg, 1294 hdr->pgio_mirror_idx); 1295 1296 trace_nfs4_pnfs_read(hdr, err); 1297 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1298 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1299 switch (err) { 1300 case -NFS4ERR_RESET_TO_PNFS: 1301 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1302 return task->tk_status; 1303 case -NFS4ERR_RESET_TO_MDS: 1304 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1305 return task->tk_status; 1306 case -EAGAIN: 1307 goto out_eagain; 1308 } 1309 1310 return 0; 1311 out_eagain: 1312 rpc_restart_call_prepare(task); 1313 return -EAGAIN; 1314 } 1315 1316 static bool 1317 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1318 { 1319 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1320 } 1321 1322 /* 1323 * We reference the rpc_cred of the first WRITE that triggers the need for 1324 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1325 * rfc5661 is not clear about which credential should be used. 1326 * 1327 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1328 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1329 * we always send layoutcommit after DS writes. 1330 */ 1331 static void 1332 ff_layout_set_layoutcommit(struct inode *inode, 1333 struct pnfs_layout_segment *lseg, 1334 loff_t end_offset) 1335 { 1336 if (!ff_layout_need_layoutcommit(lseg)) 1337 return; 1338 1339 pnfs_set_layoutcommit(inode, lseg, end_offset); 1340 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1341 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1342 } 1343 1344 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1345 struct nfs_pgio_header *hdr) 1346 { 1347 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1348 return; 1349 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1350 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1351 hdr->args.count, 1352 task->tk_start); 1353 } 1354 1355 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1356 struct nfs_pgio_header *hdr) 1357 { 1358 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1359 return; 1360 nfs4_ff_layout_stat_io_end_read(task, 1361 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1362 hdr->args.count, 1363 hdr->res.count); 1364 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1365 } 1366 1367 static int ff_layout_read_prepare_common(struct rpc_task *task, 1368 struct nfs_pgio_header *hdr) 1369 { 1370 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1371 rpc_exit(task, -EIO); 1372 return -EIO; 1373 } 1374 1375 if (!pnfs_is_valid_lseg(hdr->lseg)) { 1376 rpc_exit(task, -EAGAIN); 1377 return -EAGAIN; 1378 } 1379 1380 ff_layout_read_record_layoutstats_start(task, hdr); 1381 return 0; 1382 } 1383 1384 /* 1385 * Call ops for the async read/write cases 1386 * In the case of dense layouts, the offset needs to be reset to its 1387 * original value. 1388 */ 1389 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1390 { 1391 struct nfs_pgio_header *hdr = data; 1392 1393 if (ff_layout_read_prepare_common(task, hdr)) 1394 return; 1395 1396 rpc_call_start(task); 1397 } 1398 1399 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1400 { 1401 struct nfs_pgio_header *hdr = data; 1402 1403 if (nfs4_setup_sequence(hdr->ds_clp, 1404 &hdr->args.seq_args, 1405 &hdr->res.seq_res, 1406 task)) 1407 return; 1408 1409 ff_layout_read_prepare_common(task, hdr); 1410 } 1411 1412 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1413 { 1414 struct nfs_pgio_header *hdr = data; 1415 1416 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1417 task->tk_status == 0) { 1418 nfs4_sequence_done(task, &hdr->res.seq_res); 1419 return; 1420 } 1421 1422 /* Note this may cause RPC to be resent */ 1423 hdr->mds_ops->rpc_call_done(task, hdr); 1424 } 1425 1426 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1427 { 1428 struct nfs_pgio_header *hdr = data; 1429 1430 ff_layout_read_record_layoutstats_done(task, hdr); 1431 rpc_count_iostats_metrics(task, 1432 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1433 } 1434 1435 static void ff_layout_read_release(void *data) 1436 { 1437 struct nfs_pgio_header *hdr = data; 1438 1439 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1440 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) 1441 ff_layout_resend_pnfs_read(hdr); 1442 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1443 ff_layout_reset_read(hdr); 1444 pnfs_generic_rw_release(data); 1445 } 1446 1447 1448 static int ff_layout_write_done_cb(struct rpc_task *task, 1449 struct nfs_pgio_header *hdr) 1450 { 1451 loff_t end_offs = 0; 1452 int err; 1453 1454 if (task->tk_status < 0) { 1455 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1456 hdr->args.offset, hdr->args.count, 1457 &hdr->res.op_status, OP_WRITE, 1458 task->tk_status); 1459 trace_ff_layout_write_error(hdr); 1460 } 1461 1462 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1463 hdr->ds_clp, hdr->lseg, 1464 hdr->pgio_mirror_idx); 1465 1466 trace_nfs4_pnfs_write(hdr, err); 1467 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1468 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1469 switch (err) { 1470 case -NFS4ERR_RESET_TO_PNFS: 1471 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1472 return task->tk_status; 1473 case -NFS4ERR_RESET_TO_MDS: 1474 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1475 return task->tk_status; 1476 case -EAGAIN: 1477 return -EAGAIN; 1478 } 1479 1480 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1481 hdr->res.verf->committed == NFS_DATA_SYNC) 1482 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1483 1484 /* Note: if the write is unstable, don't set end_offs until commit */ 1485 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1486 1487 /* zero out fattr since we don't care DS attr at all */ 1488 hdr->fattr.valid = 0; 1489 if (task->tk_status >= 0) 1490 nfs_writeback_update_inode(hdr); 1491 1492 return 0; 1493 } 1494 1495 static int ff_layout_commit_done_cb(struct rpc_task *task, 1496 struct nfs_commit_data *data) 1497 { 1498 int err; 1499 1500 if (task->tk_status < 0) { 1501 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index, 1502 data->args.offset, data->args.count, 1503 &data->res.op_status, OP_COMMIT, 1504 task->tk_status); 1505 trace_ff_layout_commit_error(data); 1506 } 1507 1508 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1509 data->lseg, data->ds_commit_index); 1510 1511 trace_nfs4_pnfs_commit_ds(data, err); 1512 switch (err) { 1513 case -NFS4ERR_RESET_TO_PNFS: 1514 pnfs_generic_prepare_to_resend_writes(data); 1515 return -EAGAIN; 1516 case -NFS4ERR_RESET_TO_MDS: 1517 pnfs_generic_prepare_to_resend_writes(data); 1518 return -EAGAIN; 1519 case -EAGAIN: 1520 rpc_restart_call_prepare(task); 1521 return -EAGAIN; 1522 } 1523 1524 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1525 1526 return 0; 1527 } 1528 1529 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1530 struct nfs_pgio_header *hdr) 1531 { 1532 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1533 return; 1534 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1535 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1536 hdr->args.count, 1537 task->tk_start); 1538 } 1539 1540 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1541 struct nfs_pgio_header *hdr) 1542 { 1543 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1544 return; 1545 nfs4_ff_layout_stat_io_end_write(task, 1546 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1547 hdr->args.count, hdr->res.count, 1548 hdr->res.verf->committed); 1549 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1550 } 1551 1552 static int ff_layout_write_prepare_common(struct rpc_task *task, 1553 struct nfs_pgio_header *hdr) 1554 { 1555 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1556 rpc_exit(task, -EIO); 1557 return -EIO; 1558 } 1559 1560 if (!pnfs_is_valid_lseg(hdr->lseg)) { 1561 rpc_exit(task, -EAGAIN); 1562 return -EAGAIN; 1563 } 1564 1565 ff_layout_write_record_layoutstats_start(task, hdr); 1566 return 0; 1567 } 1568 1569 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1570 { 1571 struct nfs_pgio_header *hdr = data; 1572 1573 if (ff_layout_write_prepare_common(task, hdr)) 1574 return; 1575 1576 rpc_call_start(task); 1577 } 1578 1579 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1580 { 1581 struct nfs_pgio_header *hdr = data; 1582 1583 if (nfs4_setup_sequence(hdr->ds_clp, 1584 &hdr->args.seq_args, 1585 &hdr->res.seq_res, 1586 task)) 1587 return; 1588 1589 ff_layout_write_prepare_common(task, hdr); 1590 } 1591 1592 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1593 { 1594 struct nfs_pgio_header *hdr = data; 1595 1596 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1597 task->tk_status == 0) { 1598 nfs4_sequence_done(task, &hdr->res.seq_res); 1599 return; 1600 } 1601 1602 /* Note this may cause RPC to be resent */ 1603 hdr->mds_ops->rpc_call_done(task, hdr); 1604 } 1605 1606 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1607 { 1608 struct nfs_pgio_header *hdr = data; 1609 1610 ff_layout_write_record_layoutstats_done(task, hdr); 1611 rpc_count_iostats_metrics(task, 1612 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1613 } 1614 1615 static void ff_layout_write_release(void *data) 1616 { 1617 struct nfs_pgio_header *hdr = data; 1618 1619 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1620 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1621 ff_layout_send_layouterror(hdr->lseg); 1622 ff_layout_reset_write(hdr, true); 1623 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1624 ff_layout_reset_write(hdr, false); 1625 pnfs_generic_rw_release(data); 1626 } 1627 1628 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1629 struct nfs_commit_data *cdata) 1630 { 1631 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1632 return; 1633 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1634 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1635 0, task->tk_start); 1636 } 1637 1638 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1639 struct nfs_commit_data *cdata) 1640 { 1641 struct nfs_page *req; 1642 __u64 count = 0; 1643 1644 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1645 return; 1646 1647 if (task->tk_status == 0) { 1648 list_for_each_entry(req, &cdata->pages, wb_list) 1649 count += req->wb_bytes; 1650 } 1651 nfs4_ff_layout_stat_io_end_write(task, 1652 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1653 count, count, NFS_FILE_SYNC); 1654 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 1655 } 1656 1657 static int ff_layout_commit_prepare_common(struct rpc_task *task, 1658 struct nfs_commit_data *cdata) 1659 { 1660 if (!pnfs_is_valid_lseg(cdata->lseg)) { 1661 rpc_exit(task, -EAGAIN); 1662 return -EAGAIN; 1663 } 1664 1665 ff_layout_commit_record_layoutstats_start(task, cdata); 1666 return 0; 1667 } 1668 1669 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1670 { 1671 if (ff_layout_commit_prepare_common(task, data)) 1672 return; 1673 1674 rpc_call_start(task); 1675 } 1676 1677 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1678 { 1679 struct nfs_commit_data *wdata = data; 1680 1681 if (nfs4_setup_sequence(wdata->ds_clp, 1682 &wdata->args.seq_args, 1683 &wdata->res.seq_res, 1684 task)) 1685 return; 1686 ff_layout_commit_prepare_common(task, data); 1687 } 1688 1689 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1690 { 1691 pnfs_generic_write_commit_done(task, data); 1692 } 1693 1694 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1695 { 1696 struct nfs_commit_data *cdata = data; 1697 1698 ff_layout_commit_record_layoutstats_done(task, cdata); 1699 rpc_count_iostats_metrics(task, 1700 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1701 } 1702 1703 static void ff_layout_commit_release(void *data) 1704 { 1705 struct nfs_commit_data *cdata = data; 1706 1707 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1708 pnfs_generic_commit_release(data); 1709 } 1710 1711 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1712 .rpc_call_prepare = ff_layout_read_prepare_v3, 1713 .rpc_call_done = ff_layout_read_call_done, 1714 .rpc_count_stats = ff_layout_read_count_stats, 1715 .rpc_release = ff_layout_read_release, 1716 }; 1717 1718 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 1719 .rpc_call_prepare = ff_layout_read_prepare_v4, 1720 .rpc_call_done = ff_layout_read_call_done, 1721 .rpc_count_stats = ff_layout_read_count_stats, 1722 .rpc_release = ff_layout_read_release, 1723 }; 1724 1725 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1726 .rpc_call_prepare = ff_layout_write_prepare_v3, 1727 .rpc_call_done = ff_layout_write_call_done, 1728 .rpc_count_stats = ff_layout_write_count_stats, 1729 .rpc_release = ff_layout_write_release, 1730 }; 1731 1732 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1733 .rpc_call_prepare = ff_layout_write_prepare_v4, 1734 .rpc_call_done = ff_layout_write_call_done, 1735 .rpc_count_stats = ff_layout_write_count_stats, 1736 .rpc_release = ff_layout_write_release, 1737 }; 1738 1739 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 1740 .rpc_call_prepare = ff_layout_commit_prepare_v3, 1741 .rpc_call_done = ff_layout_commit_done, 1742 .rpc_count_stats = ff_layout_commit_count_stats, 1743 .rpc_release = ff_layout_commit_release, 1744 }; 1745 1746 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 1747 .rpc_call_prepare = ff_layout_commit_prepare_v4, 1748 .rpc_call_done = ff_layout_commit_done, 1749 .rpc_count_stats = ff_layout_commit_count_stats, 1750 .rpc_release = ff_layout_commit_release, 1751 }; 1752 1753 static enum pnfs_try_status 1754 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 1755 { 1756 struct pnfs_layout_segment *lseg = hdr->lseg; 1757 struct nfs4_pnfs_ds *ds; 1758 struct rpc_clnt *ds_clnt; 1759 struct nfs4_ff_layout_mirror *mirror; 1760 const struct cred *ds_cred; 1761 loff_t offset = hdr->args.offset; 1762 u32 idx = hdr->pgio_mirror_idx; 1763 int vers; 1764 struct nfs_fh *fh; 1765 1766 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 1767 __func__, hdr->inode->i_ino, 1768 hdr->args.pgbase, (size_t)hdr->args.count, offset); 1769 1770 mirror = FF_LAYOUT_COMP(lseg, idx); 1771 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 1772 if (!ds) 1773 goto out_failed; 1774 1775 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1776 hdr->inode); 1777 if (IS_ERR(ds_clnt)) 1778 goto out_failed; 1779 1780 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1781 if (!ds_cred) 1782 goto out_failed; 1783 1784 vers = nfs4_ff_layout_ds_version(mirror); 1785 1786 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 1787 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 1788 1789 hdr->pgio_done_cb = ff_layout_read_done_cb; 1790 refcount_inc(&ds->ds_clp->cl_count); 1791 hdr->ds_clp = ds->ds_clp; 1792 fh = nfs4_ff_layout_select_ds_fh(mirror); 1793 if (fh) 1794 hdr->args.fh = fh; 1795 1796 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1797 1798 /* 1799 * Note that if we ever decide to split across DSes, 1800 * then we may need to handle dense-like offsets. 1801 */ 1802 hdr->args.offset = offset; 1803 hdr->mds_offset = offset; 1804 1805 /* Perform an asynchronous read to ds */ 1806 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1807 vers == 3 ? &ff_layout_read_call_ops_v3 : 1808 &ff_layout_read_call_ops_v4, 1809 0, RPC_TASK_SOFTCONN); 1810 put_cred(ds_cred); 1811 return PNFS_ATTEMPTED; 1812 1813 out_failed: 1814 if (ff_layout_avoid_mds_available_ds(lseg)) 1815 return PNFS_TRY_AGAIN; 1816 trace_pnfs_mds_fallback_read_pagelist(hdr->inode, 1817 hdr->args.offset, hdr->args.count, 1818 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg); 1819 return PNFS_NOT_ATTEMPTED; 1820 } 1821 1822 /* Perform async writes. */ 1823 static enum pnfs_try_status 1824 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 1825 { 1826 struct pnfs_layout_segment *lseg = hdr->lseg; 1827 struct nfs4_pnfs_ds *ds; 1828 struct rpc_clnt *ds_clnt; 1829 struct nfs4_ff_layout_mirror *mirror; 1830 const struct cred *ds_cred; 1831 loff_t offset = hdr->args.offset; 1832 int vers; 1833 struct nfs_fh *fh; 1834 u32 idx = hdr->pgio_mirror_idx; 1835 1836 mirror = FF_LAYOUT_COMP(lseg, idx); 1837 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1838 if (!ds) 1839 goto out_failed; 1840 1841 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1842 hdr->inode); 1843 if (IS_ERR(ds_clnt)) 1844 goto out_failed; 1845 1846 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1847 if (!ds_cred) 1848 goto out_failed; 1849 1850 vers = nfs4_ff_layout_ds_version(mirror); 1851 1852 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 1853 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 1854 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 1855 vers); 1856 1857 hdr->pgio_done_cb = ff_layout_write_done_cb; 1858 refcount_inc(&ds->ds_clp->cl_count); 1859 hdr->ds_clp = ds->ds_clp; 1860 hdr->ds_commit_idx = idx; 1861 fh = nfs4_ff_layout_select_ds_fh(mirror); 1862 if (fh) 1863 hdr->args.fh = fh; 1864 1865 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1866 1867 /* 1868 * Note that if we ever decide to split across DSes, 1869 * then we may need to handle dense-like offsets. 1870 */ 1871 hdr->args.offset = offset; 1872 1873 /* Perform an asynchronous write */ 1874 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1875 vers == 3 ? &ff_layout_write_call_ops_v3 : 1876 &ff_layout_write_call_ops_v4, 1877 sync, RPC_TASK_SOFTCONN); 1878 put_cred(ds_cred); 1879 return PNFS_ATTEMPTED; 1880 1881 out_failed: 1882 if (ff_layout_avoid_mds_available_ds(lseg)) 1883 return PNFS_TRY_AGAIN; 1884 trace_pnfs_mds_fallback_write_pagelist(hdr->inode, 1885 hdr->args.offset, hdr->args.count, 1886 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg); 1887 return PNFS_NOT_ATTEMPTED; 1888 } 1889 1890 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1891 { 1892 return i; 1893 } 1894 1895 static struct nfs_fh * 1896 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1897 { 1898 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1899 1900 /* FIXME: Assume that there is only one NFS version available 1901 * for the DS. 1902 */ 1903 return &flseg->mirror_array[i]->fh_versions[0]; 1904 } 1905 1906 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 1907 { 1908 struct pnfs_layout_segment *lseg = data->lseg; 1909 struct nfs4_pnfs_ds *ds; 1910 struct rpc_clnt *ds_clnt; 1911 struct nfs4_ff_layout_mirror *mirror; 1912 const struct cred *ds_cred; 1913 u32 idx; 1914 int vers, ret; 1915 struct nfs_fh *fh; 1916 1917 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 1918 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 1919 goto out_err; 1920 1921 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1922 mirror = FF_LAYOUT_COMP(lseg, idx); 1923 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1924 if (!ds) 1925 goto out_err; 1926 1927 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1928 data->inode); 1929 if (IS_ERR(ds_clnt)) 1930 goto out_err; 1931 1932 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred); 1933 if (!ds_cred) 1934 goto out_err; 1935 1936 vers = nfs4_ff_layout_ds_version(mirror); 1937 1938 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 1939 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 1940 vers); 1941 data->commit_done_cb = ff_layout_commit_done_cb; 1942 data->cred = ds_cred; 1943 refcount_inc(&ds->ds_clp->cl_count); 1944 data->ds_clp = ds->ds_clp; 1945 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1946 if (fh) 1947 data->args.fh = fh; 1948 1949 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 1950 vers == 3 ? &ff_layout_commit_call_ops_v3 : 1951 &ff_layout_commit_call_ops_v4, 1952 how, RPC_TASK_SOFTCONN); 1953 put_cred(ds_cred); 1954 return ret; 1955 out_err: 1956 pnfs_generic_prepare_to_resend_writes(data); 1957 pnfs_generic_commit_release(data); 1958 return -EAGAIN; 1959 } 1960 1961 static int 1962 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1963 int how, struct nfs_commit_info *cinfo) 1964 { 1965 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1966 ff_layout_initiate_commit); 1967 } 1968 1969 static bool ff_layout_match_rw(const struct rpc_task *task, 1970 const struct nfs_pgio_header *hdr, 1971 const struct pnfs_layout_segment *lseg) 1972 { 1973 return hdr->lseg == lseg; 1974 } 1975 1976 static bool ff_layout_match_commit(const struct rpc_task *task, 1977 const struct nfs_commit_data *cdata, 1978 const struct pnfs_layout_segment *lseg) 1979 { 1980 return cdata->lseg == lseg; 1981 } 1982 1983 static bool ff_layout_match_io(const struct rpc_task *task, const void *data) 1984 { 1985 const struct rpc_call_ops *ops = task->tk_ops; 1986 1987 if (ops == &ff_layout_read_call_ops_v3 || 1988 ops == &ff_layout_read_call_ops_v4 || 1989 ops == &ff_layout_write_call_ops_v3 || 1990 ops == &ff_layout_write_call_ops_v4) 1991 return ff_layout_match_rw(task, task->tk_calldata, data); 1992 if (ops == &ff_layout_commit_call_ops_v3 || 1993 ops == &ff_layout_commit_call_ops_v4) 1994 return ff_layout_match_commit(task, task->tk_calldata, data); 1995 return false; 1996 } 1997 1998 static void ff_layout_cancel_io(struct pnfs_layout_segment *lseg) 1999 { 2000 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 2001 struct nfs4_ff_layout_mirror *mirror; 2002 struct nfs4_ff_layout_ds *mirror_ds; 2003 struct nfs4_pnfs_ds *ds; 2004 struct nfs_client *ds_clp; 2005 struct rpc_clnt *clnt; 2006 u32 idx; 2007 2008 for (idx = 0; idx < flseg->mirror_array_cnt; idx++) { 2009 mirror = flseg->mirror_array[idx]; 2010 mirror_ds = mirror->mirror_ds; 2011 if (IS_ERR_OR_NULL(mirror_ds)) 2012 continue; 2013 ds = mirror->mirror_ds->ds; 2014 if (!ds) 2015 continue; 2016 ds_clp = ds->ds_clp; 2017 if (!ds_clp) 2018 continue; 2019 clnt = ds_clp->cl_rpcclient; 2020 if (!clnt) 2021 continue; 2022 if (!rpc_cancel_tasks(clnt, -EAGAIN, ff_layout_match_io, lseg)) 2023 continue; 2024 rpc_clnt_disconnect(clnt); 2025 } 2026 } 2027 2028 static struct pnfs_ds_commit_info * 2029 ff_layout_get_ds_info(struct inode *inode) 2030 { 2031 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 2032 2033 if (layout == NULL) 2034 return NULL; 2035 2036 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 2037 } 2038 2039 static void 2040 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 2041 struct pnfs_layout_segment *lseg) 2042 { 2043 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 2044 struct inode *inode = lseg->pls_layout->plh_inode; 2045 struct pnfs_commit_array *array, *new; 2046 2047 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt, 2048 nfs_io_gfp_mask()); 2049 if (new) { 2050 spin_lock(&inode->i_lock); 2051 array = pnfs_add_commit_array(fl_cinfo, new, lseg); 2052 spin_unlock(&inode->i_lock); 2053 if (array != new) 2054 pnfs_free_commit_array(new); 2055 } 2056 } 2057 2058 static void 2059 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 2060 struct inode *inode) 2061 { 2062 spin_lock(&inode->i_lock); 2063 pnfs_generic_ds_cinfo_destroy(fl_cinfo); 2064 spin_unlock(&inode->i_lock); 2065 } 2066 2067 static void 2068 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 2069 { 2070 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 2071 id_node)); 2072 } 2073 2074 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 2075 const struct nfs4_layoutreturn_args *args, 2076 const struct nfs4_flexfile_layoutreturn_args *ff_args) 2077 { 2078 __be32 *start; 2079 2080 start = xdr_reserve_space(xdr, 4); 2081 if (unlikely(!start)) 2082 return -E2BIG; 2083 2084 *start = cpu_to_be32(ff_args->num_errors); 2085 /* This assume we always return _ALL_ layouts */ 2086 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 2087 } 2088 2089 static void 2090 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len) 2091 { 2092 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0); 2093 } 2094 2095 static void 2096 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 2097 const nfs4_stateid *stateid, 2098 const struct nfs42_layoutstat_devinfo *devinfo) 2099 { 2100 __be32 *p; 2101 2102 p = xdr_reserve_space(xdr, 8 + 8); 2103 p = xdr_encode_hyper(p, devinfo->offset); 2104 p = xdr_encode_hyper(p, devinfo->length); 2105 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 2106 p = xdr_reserve_space(xdr, 4*8); 2107 p = xdr_encode_hyper(p, devinfo->read_count); 2108 p = xdr_encode_hyper(p, devinfo->read_bytes); 2109 p = xdr_encode_hyper(p, devinfo->write_count); 2110 p = xdr_encode_hyper(p, devinfo->write_bytes); 2111 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 2112 } 2113 2114 static void 2115 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 2116 const nfs4_stateid *stateid, 2117 const struct nfs42_layoutstat_devinfo *devinfo) 2118 { 2119 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 2120 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 2121 devinfo->ld_private.data); 2122 } 2123 2124 /* report nothing for now */ 2125 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 2126 const struct nfs4_layoutreturn_args *args, 2127 struct nfs4_flexfile_layoutreturn_args *ff_args) 2128 { 2129 __be32 *p; 2130 int i; 2131 2132 p = xdr_reserve_space(xdr, 4); 2133 *p = cpu_to_be32(ff_args->num_dev); 2134 for (i = 0; i < ff_args->num_dev; i++) 2135 ff_layout_encode_ff_iostat(xdr, 2136 &args->layout->plh_stateid, 2137 &ff_args->devinfo[i]); 2138 } 2139 2140 static void 2141 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 2142 unsigned int num_entries) 2143 { 2144 unsigned int i; 2145 2146 for (i = 0; i < num_entries; i++) { 2147 if (!devinfo[i].ld_private.ops) 2148 continue; 2149 if (!devinfo[i].ld_private.ops->free) 2150 continue; 2151 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 2152 } 2153 } 2154 2155 static struct nfs4_deviceid_node * 2156 ff_layout_alloc_deviceid_node(struct nfs_server *server, 2157 struct pnfs_device *pdev, gfp_t gfp_flags) 2158 { 2159 struct nfs4_ff_layout_ds *dsaddr; 2160 2161 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2162 if (!dsaddr) 2163 return NULL; 2164 return &dsaddr->id_node; 2165 } 2166 2167 static void 2168 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2169 const void *voidargs, 2170 const struct nfs4_xdr_opaque_data *ff_opaque) 2171 { 2172 const struct nfs4_layoutreturn_args *args = voidargs; 2173 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2174 struct xdr_buf tmp_buf = { 2175 .head = { 2176 [0] = { 2177 .iov_base = page_address(ff_args->pages[0]), 2178 }, 2179 }, 2180 .buflen = PAGE_SIZE, 2181 }; 2182 struct xdr_stream tmp_xdr; 2183 __be32 *start; 2184 2185 dprintk("%s: Begin\n", __func__); 2186 2187 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL); 2188 2189 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2190 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2191 2192 start = xdr_reserve_space(xdr, 4); 2193 *start = cpu_to_be32(tmp_buf.len); 2194 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2195 2196 dprintk("%s: Return\n", __func__); 2197 } 2198 2199 static void 2200 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2201 { 2202 struct nfs4_flexfile_layoutreturn_args *ff_args; 2203 2204 if (!args->data) 2205 return; 2206 ff_args = args->data; 2207 args->data = NULL; 2208 2209 ff_layout_free_ds_ioerr(&ff_args->errors); 2210 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2211 2212 put_page(ff_args->pages[0]); 2213 kfree(ff_args); 2214 } 2215 2216 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2217 .encode = ff_layout_encode_layoutreturn, 2218 .free = ff_layout_free_layoutreturn, 2219 }; 2220 2221 static int 2222 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2223 { 2224 struct nfs4_flexfile_layoutreturn_args *ff_args; 2225 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2226 2227 ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask()); 2228 if (!ff_args) 2229 goto out_nomem; 2230 ff_args->pages[0] = alloc_page(nfs_io_gfp_mask()); 2231 if (!ff_args->pages[0]) 2232 goto out_nomem_free; 2233 2234 INIT_LIST_HEAD(&ff_args->errors); 2235 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2236 &args->range, &ff_args->errors, 2237 FF_LAYOUTRETURN_MAXERR); 2238 2239 spin_lock(&args->inode->i_lock); 2240 ff_args->num_dev = ff_layout_mirror_prepare_stats( 2241 &ff_layout->generic_hdr, &ff_args->devinfo[0], 2242 ARRAY_SIZE(ff_args->devinfo), NFS4_FF_OP_LAYOUTRETURN); 2243 spin_unlock(&args->inode->i_lock); 2244 2245 args->ld_private->ops = &layoutreturn_ops; 2246 args->ld_private->data = ff_args; 2247 return 0; 2248 out_nomem_free: 2249 kfree(ff_args); 2250 out_nomem: 2251 return -ENOMEM; 2252 } 2253 2254 #ifdef CONFIG_NFS_V4_2 2255 void 2256 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2257 { 2258 struct pnfs_layout_hdr *lo = lseg->pls_layout; 2259 struct nfs42_layout_error *errors; 2260 LIST_HEAD(head); 2261 2262 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) 2263 return; 2264 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); 2265 if (list_empty(&head)) 2266 return; 2267 2268 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors), 2269 nfs_io_gfp_mask()); 2270 if (errors != NULL) { 2271 const struct nfs4_ff_layout_ds_err *pos; 2272 size_t n = 0; 2273 2274 list_for_each_entry(pos, &head, list) { 2275 errors[n].offset = pos->offset; 2276 errors[n].length = pos->length; 2277 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); 2278 errors[n].errors[0].dev_id = pos->deviceid; 2279 errors[n].errors[0].status = pos->status; 2280 errors[n].errors[0].opnum = pos->opnum; 2281 n++; 2282 if (!list_is_last(&pos->list, &head) && 2283 n < NFS42_LAYOUTERROR_MAX) 2284 continue; 2285 if (nfs42_proc_layouterror(lseg, errors, n) < 0) 2286 break; 2287 n = 0; 2288 } 2289 kfree(errors); 2290 } 2291 ff_layout_free_ds_ioerr(&head); 2292 } 2293 #else 2294 void 2295 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2296 { 2297 } 2298 #endif 2299 2300 static int 2301 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2302 { 2303 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2304 2305 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2306 } 2307 2308 static size_t 2309 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2310 const int buflen) 2311 { 2312 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2313 const struct in6_addr *addr = &sin6->sin6_addr; 2314 2315 /* 2316 * RFC 4291, Section 2.2.2 2317 * 2318 * Shorthanded ANY address 2319 */ 2320 if (ipv6_addr_any(addr)) 2321 return snprintf(buf, buflen, "::"); 2322 2323 /* 2324 * RFC 4291, Section 2.2.2 2325 * 2326 * Shorthanded loopback address 2327 */ 2328 if (ipv6_addr_loopback(addr)) 2329 return snprintf(buf, buflen, "::1"); 2330 2331 /* 2332 * RFC 4291, Section 2.2.3 2333 * 2334 * Special presentation address format for mapped v4 2335 * addresses. 2336 */ 2337 if (ipv6_addr_v4mapped(addr)) 2338 return snprintf(buf, buflen, "::ffff:%pI4", 2339 &addr->s6_addr32[3]); 2340 2341 /* 2342 * RFC 4291, Section 2.2.1 2343 */ 2344 return snprintf(buf, buflen, "%pI6c", addr); 2345 } 2346 2347 /* Derived from rpc_sockaddr2uaddr */ 2348 static void 2349 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2350 { 2351 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2352 char portbuf[RPCBIND_MAXUADDRPLEN]; 2353 char addrbuf[RPCBIND_MAXUADDRLEN]; 2354 unsigned short port; 2355 int len, netid_len; 2356 __be32 *p; 2357 2358 switch (sap->sa_family) { 2359 case AF_INET: 2360 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2361 return; 2362 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2363 break; 2364 case AF_INET6: 2365 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2366 return; 2367 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2368 break; 2369 default: 2370 WARN_ON_ONCE(1); 2371 return; 2372 } 2373 2374 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2375 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2376 2377 netid_len = strlen(da->da_netid); 2378 p = xdr_reserve_space(xdr, 4 + netid_len); 2379 xdr_encode_opaque(p, da->da_netid, netid_len); 2380 2381 p = xdr_reserve_space(xdr, 4 + len); 2382 xdr_encode_opaque(p, addrbuf, len); 2383 } 2384 2385 static void 2386 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2387 ktime_t t) 2388 { 2389 struct timespec64 ts; 2390 __be32 *p; 2391 2392 p = xdr_reserve_space(xdr, 12); 2393 ts = ktime_to_timespec64(t); 2394 p = xdr_encode_hyper(p, ts.tv_sec); 2395 *p++ = cpu_to_be32(ts.tv_nsec); 2396 } 2397 2398 static void 2399 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2400 struct nfs4_ff_io_stat *stat) 2401 { 2402 __be32 *p; 2403 2404 p = xdr_reserve_space(xdr, 5 * 8); 2405 p = xdr_encode_hyper(p, stat->ops_requested); 2406 p = xdr_encode_hyper(p, stat->bytes_requested); 2407 p = xdr_encode_hyper(p, stat->ops_completed); 2408 p = xdr_encode_hyper(p, stat->bytes_completed); 2409 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2410 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2411 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2412 } 2413 2414 static void 2415 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2416 const struct nfs42_layoutstat_devinfo *devinfo, 2417 struct nfs4_ff_layout_mirror *mirror) 2418 { 2419 struct nfs4_pnfs_ds_addr *da; 2420 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds; 2421 struct nfs_fh *fh = &mirror->fh_versions[0]; 2422 __be32 *p; 2423 2424 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2425 dprintk("%s: DS %s: encoding address %s\n", 2426 __func__, ds->ds_remotestr, da->da_remotestr); 2427 /* netaddr4 */ 2428 ff_layout_encode_netaddr(xdr, da); 2429 /* nfs_fh4 */ 2430 p = xdr_reserve_space(xdr, 4 + fh->size); 2431 xdr_encode_opaque(p, fh->data, fh->size); 2432 /* ff_io_latency4 read */ 2433 spin_lock(&mirror->lock); 2434 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat); 2435 /* ff_io_latency4 write */ 2436 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat); 2437 spin_unlock(&mirror->lock); 2438 /* nfstime4 */ 2439 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time)); 2440 /* bool */ 2441 p = xdr_reserve_space(xdr, 4); 2442 *p = cpu_to_be32(false); 2443 } 2444 2445 static void 2446 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2447 const struct nfs4_xdr_opaque_data *opaque) 2448 { 2449 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2450 struct nfs42_layoutstat_devinfo, ld_private); 2451 __be32 *start; 2452 2453 /* layoutupdate length */ 2454 start = xdr_reserve_space(xdr, 4); 2455 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2456 2457 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2458 } 2459 2460 static void 2461 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2462 { 2463 struct nfs4_ff_layout_mirror *mirror = opaque->data; 2464 2465 ff_layout_put_mirror(mirror); 2466 } 2467 2468 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2469 .encode = ff_layout_encode_layoutstats, 2470 .free = ff_layout_free_layoutstats, 2471 }; 2472 2473 static int 2474 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2475 struct nfs42_layoutstat_devinfo *devinfo, 2476 int dev_limit, enum nfs4_ff_op_type type) 2477 { 2478 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2479 struct nfs4_ff_layout_mirror *mirror; 2480 struct nfs4_deviceid_node *dev; 2481 int i = 0; 2482 2483 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2484 if (i >= dev_limit) 2485 break; 2486 if (IS_ERR_OR_NULL(mirror->mirror_ds)) 2487 continue; 2488 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, 2489 &mirror->flags) && 2490 type != NFS4_FF_OP_LAYOUTRETURN) 2491 continue; 2492 /* mirror refcount put in cleanup_layoutstats */ 2493 if (!refcount_inc_not_zero(&mirror->ref)) 2494 continue; 2495 dev = &mirror->mirror_ds->id_node; 2496 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE); 2497 devinfo->offset = 0; 2498 devinfo->length = NFS4_MAX_UINT64; 2499 spin_lock(&mirror->lock); 2500 devinfo->read_count = mirror->read_stat.io_stat.ops_completed; 2501 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed; 2502 devinfo->write_count = mirror->write_stat.io_stat.ops_completed; 2503 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed; 2504 spin_unlock(&mirror->lock); 2505 devinfo->layout_type = LAYOUT_FLEX_FILES; 2506 devinfo->ld_private.ops = &layoutstat_ops; 2507 devinfo->ld_private.data = mirror; 2508 2509 devinfo++; 2510 i++; 2511 } 2512 return i; 2513 } 2514 2515 static int ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2516 { 2517 struct pnfs_layout_hdr *lo; 2518 struct nfs4_flexfile_layout *ff_layout; 2519 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2520 2521 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2522 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), 2523 nfs_io_gfp_mask()); 2524 if (!args->devinfo) 2525 return -ENOMEM; 2526 2527 spin_lock(&args->inode->i_lock); 2528 lo = NFS_I(args->inode)->layout; 2529 if (lo && pnfs_layout_is_valid(lo)) { 2530 ff_layout = FF_LAYOUT_FROM_HDR(lo); 2531 args->num_dev = ff_layout_mirror_prepare_stats( 2532 &ff_layout->generic_hdr, &args->devinfo[0], dev_count, 2533 NFS4_FF_OP_LAYOUTSTATS); 2534 } else 2535 args->num_dev = 0; 2536 spin_unlock(&args->inode->i_lock); 2537 if (!args->num_dev) { 2538 kfree(args->devinfo); 2539 args->devinfo = NULL; 2540 return -ENOENT; 2541 } 2542 2543 return 0; 2544 } 2545 2546 static int 2547 ff_layout_set_layoutdriver(struct nfs_server *server, 2548 const struct nfs_fh *dummy) 2549 { 2550 #if IS_ENABLED(CONFIG_NFS_V4_2) 2551 server->caps |= NFS_CAP_LAYOUTSTATS; 2552 #endif 2553 return 0; 2554 } 2555 2556 static const struct pnfs_commit_ops ff_layout_commit_ops = { 2557 .setup_ds_info = ff_layout_setup_ds_info, 2558 .release_ds_info = ff_layout_release_ds_info, 2559 .mark_request_commit = pnfs_layout_mark_request_commit, 2560 .clear_request_commit = pnfs_generic_clear_request_commit, 2561 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2562 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2563 .commit_pagelist = ff_layout_commit_pagelist, 2564 }; 2565 2566 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2567 .id = LAYOUT_FLEX_FILES, 2568 .name = "LAYOUT_FLEX_FILES", 2569 .owner = THIS_MODULE, 2570 .flags = PNFS_LAYOUTGET_ON_OPEN, 2571 .max_layoutget_response = 4096, /* 1 page or so... */ 2572 .set_layoutdriver = ff_layout_set_layoutdriver, 2573 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2574 .free_layout_hdr = ff_layout_free_layout_hdr, 2575 .alloc_lseg = ff_layout_alloc_lseg, 2576 .free_lseg = ff_layout_free_lseg, 2577 .add_lseg = ff_layout_add_lseg, 2578 .pg_read_ops = &ff_layout_pg_read_ops, 2579 .pg_write_ops = &ff_layout_pg_write_ops, 2580 .get_ds_info = ff_layout_get_ds_info, 2581 .free_deviceid_node = ff_layout_free_deviceid_node, 2582 .read_pagelist = ff_layout_read_pagelist, 2583 .write_pagelist = ff_layout_write_pagelist, 2584 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 2585 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 2586 .sync = pnfs_nfs_generic_sync, 2587 .prepare_layoutstats = ff_layout_prepare_layoutstats, 2588 .cancel_io = ff_layout_cancel_io, 2589 }; 2590 2591 static int __init nfs4flexfilelayout_init(void) 2592 { 2593 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 2594 __func__); 2595 return pnfs_register_layoutdriver(&flexfilelayout_type); 2596 } 2597 2598 static void __exit nfs4flexfilelayout_exit(void) 2599 { 2600 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 2601 __func__); 2602 pnfs_unregister_layoutdriver(&flexfilelayout_type); 2603 } 2604 2605 MODULE_ALIAS("nfs-layouttype4-4"); 2606 2607 MODULE_LICENSE("GPL"); 2608 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 2609 2610 module_init(nfs4flexfilelayout_init); 2611 module_exit(nfs4flexfilelayout_exit); 2612 2613 module_param(io_maxretrans, ushort, 0644); 2614 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client " 2615 "retries an I/O request before returning an error. "); 2616