1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Module for pnfs flexfile layout driver. 4 * 5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved. 6 * 7 * Tao Peng <bergwolf@primarydata.com> 8 */ 9 10 #include <linux/nfs_fs.h> 11 #include <linux/nfs_mount.h> 12 #include <linux/nfs_page.h> 13 #include <linux/module.h> 14 #include <linux/sched/mm.h> 15 16 #include <linux/sunrpc/metrics.h> 17 18 #include "flexfilelayout.h" 19 #include "../nfs4session.h" 20 #include "../nfs4idmap.h" 21 #include "../internal.h" 22 #include "../delegation.h" 23 #include "../nfs4trace.h" 24 #include "../iostat.h" 25 #include "../nfs.h" 26 #include "../nfs42.h" 27 28 #define NFSDBG_FACILITY NFSDBG_PNFS_LD 29 30 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ) 31 #define FF_LAYOUTRETURN_MAXERR 20 32 33 static unsigned short io_maxretrans; 34 35 static const struct pnfs_commit_ops ff_layout_commit_ops; 36 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 37 struct nfs_pgio_header *hdr); 38 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 39 struct nfs42_layoutstat_devinfo *devinfo, 40 int dev_limit); 41 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 42 const struct nfs42_layoutstat_devinfo *devinfo, 43 struct nfs4_ff_layout_mirror *mirror); 44 45 static struct pnfs_layout_hdr * 46 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 47 { 48 struct nfs4_flexfile_layout *ffl; 49 50 ffl = kzalloc(sizeof(*ffl), gfp_flags); 51 if (ffl) { 52 pnfs_init_ds_commit_info(&ffl->commit_info); 53 INIT_LIST_HEAD(&ffl->error_list); 54 INIT_LIST_HEAD(&ffl->mirrors); 55 ffl->last_report_time = ktime_get(); 56 ffl->commit_info.ops = &ff_layout_commit_ops; 57 return &ffl->generic_hdr; 58 } else 59 return NULL; 60 } 61 62 static void 63 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo) 64 { 65 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo); 66 struct nfs4_ff_layout_ds_err *err, *n; 67 68 list_for_each_entry_safe(err, n, &ffl->error_list, list) { 69 list_del(&err->list); 70 kfree(err); 71 } 72 kfree_rcu(ffl, generic_hdr.plh_rcu); 73 } 74 75 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 76 { 77 __be32 *p; 78 79 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 80 if (unlikely(p == NULL)) 81 return -ENOBUFS; 82 stateid->type = NFS4_PNFS_DS_STATEID_TYPE; 83 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 84 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__, 85 p[0], p[1], p[2], p[3]); 86 return 0; 87 } 88 89 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid) 90 { 91 __be32 *p; 92 93 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE); 94 if (unlikely(!p)) 95 return -ENOBUFS; 96 memcpy(devid, p, NFS4_DEVICEID4_SIZE); 97 nfs4_print_deviceid(devid); 98 return 0; 99 } 100 101 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 102 { 103 __be32 *p; 104 105 p = xdr_inline_decode(xdr, 4); 106 if (unlikely(!p)) 107 return -ENOBUFS; 108 fh->size = be32_to_cpup(p++); 109 if (fh->size > sizeof(struct nfs_fh)) { 110 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n", 111 fh->size); 112 return -EOVERFLOW; 113 } 114 /* fh.data */ 115 p = xdr_inline_decode(xdr, fh->size); 116 if (unlikely(!p)) 117 return -ENOBUFS; 118 memcpy(&fh->data, p, fh->size); 119 dprintk("%s: fh len %d\n", __func__, fh->size); 120 121 return 0; 122 } 123 124 /* 125 * Currently only stringified uids and gids are accepted. 126 * I.e., kerberos is not supported to the DSes, so no pricipals. 127 * 128 * That means that one common function will suffice, but when 129 * principals are added, this should be split to accomodate 130 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid(). 131 */ 132 static int 133 decode_name(struct xdr_stream *xdr, u32 *id) 134 { 135 __be32 *p; 136 int len; 137 138 /* opaque_length(4)*/ 139 p = xdr_inline_decode(xdr, 4); 140 if (unlikely(!p)) 141 return -ENOBUFS; 142 len = be32_to_cpup(p++); 143 if (len < 0) 144 return -EINVAL; 145 146 dprintk("%s: len %u\n", __func__, len); 147 148 /* opaque body */ 149 p = xdr_inline_decode(xdr, len); 150 if (unlikely(!p)) 151 return -ENOBUFS; 152 153 if (!nfs_map_string_to_numeric((char *)p, len, id)) 154 return -EINVAL; 155 156 return 0; 157 } 158 159 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1, 160 const struct nfs4_ff_layout_mirror *m2) 161 { 162 int i, j; 163 164 if (m1->fh_versions_cnt != m2->fh_versions_cnt) 165 return false; 166 for (i = 0; i < m1->fh_versions_cnt; i++) { 167 bool found_fh = false; 168 for (j = 0; j < m2->fh_versions_cnt; j++) { 169 if (nfs_compare_fh(&m1->fh_versions[i], 170 &m2->fh_versions[j]) == 0) { 171 found_fh = true; 172 break; 173 } 174 } 175 if (!found_fh) 176 return false; 177 } 178 return true; 179 } 180 181 static struct nfs4_ff_layout_mirror * 182 ff_layout_add_mirror(struct pnfs_layout_hdr *lo, 183 struct nfs4_ff_layout_mirror *mirror) 184 { 185 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 186 struct nfs4_ff_layout_mirror *pos; 187 struct inode *inode = lo->plh_inode; 188 189 spin_lock(&inode->i_lock); 190 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) { 191 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0) 192 continue; 193 if (!ff_mirror_match_fh(mirror, pos)) 194 continue; 195 if (refcount_inc_not_zero(&pos->ref)) { 196 spin_unlock(&inode->i_lock); 197 return pos; 198 } 199 } 200 list_add(&mirror->mirrors, &ff_layout->mirrors); 201 mirror->layout = lo; 202 spin_unlock(&inode->i_lock); 203 return mirror; 204 } 205 206 static void 207 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror) 208 { 209 struct inode *inode; 210 if (mirror->layout == NULL) 211 return; 212 inode = mirror->layout->plh_inode; 213 spin_lock(&inode->i_lock); 214 list_del(&mirror->mirrors); 215 spin_unlock(&inode->i_lock); 216 mirror->layout = NULL; 217 } 218 219 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags) 220 { 221 struct nfs4_ff_layout_mirror *mirror; 222 223 mirror = kzalloc(sizeof(*mirror), gfp_flags); 224 if (mirror != NULL) { 225 spin_lock_init(&mirror->lock); 226 refcount_set(&mirror->ref, 1); 227 INIT_LIST_HEAD(&mirror->mirrors); 228 } 229 return mirror; 230 } 231 232 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror) 233 { 234 const struct cred *cred; 235 236 ff_layout_remove_mirror(mirror); 237 kfree(mirror->fh_versions); 238 cred = rcu_access_pointer(mirror->ro_cred); 239 put_cred(cred); 240 cred = rcu_access_pointer(mirror->rw_cred); 241 put_cred(cred); 242 nfs4_ff_layout_put_deviceid(mirror->mirror_ds); 243 kfree(mirror); 244 } 245 246 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror) 247 { 248 if (mirror != NULL && refcount_dec_and_test(&mirror->ref)) 249 ff_layout_free_mirror(mirror); 250 } 251 252 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls) 253 { 254 u32 i; 255 256 for (i = 0; i < fls->mirror_array_cnt; i++) 257 ff_layout_put_mirror(fls->mirror_array[i]); 258 } 259 260 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls) 261 { 262 if (fls) { 263 ff_layout_free_mirror_array(fls); 264 kfree(fls); 265 } 266 } 267 268 static bool 269 ff_lseg_match_mirrors(struct pnfs_layout_segment *l1, 270 struct pnfs_layout_segment *l2) 271 { 272 const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1); 273 const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1); 274 u32 i; 275 276 if (fl1->mirror_array_cnt != fl2->mirror_array_cnt) 277 return false; 278 for (i = 0; i < fl1->mirror_array_cnt; i++) { 279 if (fl1->mirror_array[i] != fl2->mirror_array[i]) 280 return false; 281 } 282 return true; 283 } 284 285 static bool 286 ff_lseg_range_is_after(const struct pnfs_layout_range *l1, 287 const struct pnfs_layout_range *l2) 288 { 289 u64 end1, end2; 290 291 if (l1->iomode != l2->iomode) 292 return l1->iomode != IOMODE_READ; 293 end1 = pnfs_calc_offset_end(l1->offset, l1->length); 294 end2 = pnfs_calc_offset_end(l2->offset, l2->length); 295 if (end1 < l2->offset) 296 return false; 297 if (end2 < l1->offset) 298 return true; 299 return l2->offset <= l1->offset; 300 } 301 302 static bool 303 ff_lseg_merge(struct pnfs_layout_segment *new, 304 struct pnfs_layout_segment *old) 305 { 306 u64 new_end, old_end; 307 308 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags)) 309 return false; 310 if (new->pls_range.iomode != old->pls_range.iomode) 311 return false; 312 old_end = pnfs_calc_offset_end(old->pls_range.offset, 313 old->pls_range.length); 314 if (old_end < new->pls_range.offset) 315 return false; 316 new_end = pnfs_calc_offset_end(new->pls_range.offset, 317 new->pls_range.length); 318 if (new_end < old->pls_range.offset) 319 return false; 320 if (!ff_lseg_match_mirrors(new, old)) 321 return false; 322 323 /* Mergeable: copy info from 'old' to 'new' */ 324 if (new_end < old_end) 325 new_end = old_end; 326 if (new->pls_range.offset < old->pls_range.offset) 327 new->pls_range.offset = old->pls_range.offset; 328 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset, 329 new_end); 330 if (test_bit(NFS_LSEG_ROC, &old->pls_flags)) 331 set_bit(NFS_LSEG_ROC, &new->pls_flags); 332 return true; 333 } 334 335 static void 336 ff_layout_add_lseg(struct pnfs_layout_hdr *lo, 337 struct pnfs_layout_segment *lseg, 338 struct list_head *free_me) 339 { 340 pnfs_generic_layout_insert_lseg(lo, lseg, 341 ff_lseg_range_is_after, 342 ff_lseg_merge, 343 free_me); 344 } 345 346 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls) 347 { 348 int i, j; 349 350 for (i = 0; i < fls->mirror_array_cnt - 1; i++) { 351 for (j = i + 1; j < fls->mirror_array_cnt; j++) 352 if (fls->mirror_array[i]->efficiency < 353 fls->mirror_array[j]->efficiency) 354 swap(fls->mirror_array[i], 355 fls->mirror_array[j]); 356 } 357 } 358 359 static struct pnfs_layout_segment * 360 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh, 361 struct nfs4_layoutget_res *lgr, 362 gfp_t gfp_flags) 363 { 364 struct pnfs_layout_segment *ret; 365 struct nfs4_ff_layout_segment *fls = NULL; 366 struct xdr_stream stream; 367 struct xdr_buf buf; 368 struct page *scratch; 369 u64 stripe_unit; 370 u32 mirror_array_cnt; 371 __be32 *p; 372 int i, rc; 373 374 dprintk("--> %s\n", __func__); 375 scratch = alloc_page(gfp_flags); 376 if (!scratch) 377 return ERR_PTR(-ENOMEM); 378 379 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, 380 lgr->layoutp->len); 381 xdr_set_scratch_page(&stream, scratch); 382 383 /* stripe unit and mirror_array_cnt */ 384 rc = -EIO; 385 p = xdr_inline_decode(&stream, 8 + 4); 386 if (!p) 387 goto out_err_free; 388 389 p = xdr_decode_hyper(p, &stripe_unit); 390 mirror_array_cnt = be32_to_cpup(p++); 391 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__, 392 stripe_unit, mirror_array_cnt); 393 394 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT || 395 mirror_array_cnt == 0) 396 goto out_err_free; 397 398 rc = -ENOMEM; 399 fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt), 400 gfp_flags); 401 if (!fls) 402 goto out_err_free; 403 404 fls->mirror_array_cnt = mirror_array_cnt; 405 fls->stripe_unit = stripe_unit; 406 407 for (i = 0; i < fls->mirror_array_cnt; i++) { 408 struct nfs4_ff_layout_mirror *mirror; 409 struct cred *kcred; 410 const struct cred __rcu *cred; 411 kuid_t uid; 412 kgid_t gid; 413 u32 ds_count, fh_count, id; 414 int j; 415 416 rc = -EIO; 417 p = xdr_inline_decode(&stream, 4); 418 if (!p) 419 goto out_err_free; 420 ds_count = be32_to_cpup(p); 421 422 /* FIXME: allow for striping? */ 423 if (ds_count != 1) 424 goto out_err_free; 425 426 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags); 427 if (fls->mirror_array[i] == NULL) { 428 rc = -ENOMEM; 429 goto out_err_free; 430 } 431 432 fls->mirror_array[i]->ds_count = ds_count; 433 434 /* deviceid */ 435 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid); 436 if (rc) 437 goto out_err_free; 438 439 /* efficiency */ 440 rc = -EIO; 441 p = xdr_inline_decode(&stream, 4); 442 if (!p) 443 goto out_err_free; 444 fls->mirror_array[i]->efficiency = be32_to_cpup(p); 445 446 /* stateid */ 447 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid); 448 if (rc) 449 goto out_err_free; 450 451 /* fh */ 452 rc = -EIO; 453 p = xdr_inline_decode(&stream, 4); 454 if (!p) 455 goto out_err_free; 456 fh_count = be32_to_cpup(p); 457 458 fls->mirror_array[i]->fh_versions = 459 kcalloc(fh_count, sizeof(struct nfs_fh), 460 gfp_flags); 461 if (fls->mirror_array[i]->fh_versions == NULL) { 462 rc = -ENOMEM; 463 goto out_err_free; 464 } 465 466 for (j = 0; j < fh_count; j++) { 467 rc = decode_nfs_fh(&stream, 468 &fls->mirror_array[i]->fh_versions[j]); 469 if (rc) 470 goto out_err_free; 471 } 472 473 fls->mirror_array[i]->fh_versions_cnt = fh_count; 474 475 /* user */ 476 rc = decode_name(&stream, &id); 477 if (rc) 478 goto out_err_free; 479 480 uid = make_kuid(&init_user_ns, id); 481 482 /* group */ 483 rc = decode_name(&stream, &id); 484 if (rc) 485 goto out_err_free; 486 487 gid = make_kgid(&init_user_ns, id); 488 489 if (gfp_flags & __GFP_FS) 490 kcred = prepare_kernel_cred(NULL); 491 else { 492 unsigned int nofs_flags = memalloc_nofs_save(); 493 kcred = prepare_kernel_cred(NULL); 494 memalloc_nofs_restore(nofs_flags); 495 } 496 rc = -ENOMEM; 497 if (!kcred) 498 goto out_err_free; 499 kcred->fsuid = uid; 500 kcred->fsgid = gid; 501 cred = RCU_INITIALIZER(kcred); 502 503 if (lgr->range.iomode == IOMODE_READ) 504 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 505 else 506 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 507 508 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]); 509 if (mirror != fls->mirror_array[i]) { 510 /* swap cred ptrs so free_mirror will clean up old */ 511 if (lgr->range.iomode == IOMODE_READ) { 512 cred = xchg(&mirror->ro_cred, cred); 513 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 514 } else { 515 cred = xchg(&mirror->rw_cred, cred); 516 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 517 } 518 ff_layout_free_mirror(fls->mirror_array[i]); 519 fls->mirror_array[i] = mirror; 520 } 521 522 dprintk("%s: iomode %s uid %u gid %u\n", __func__, 523 lgr->range.iomode == IOMODE_READ ? "READ" : "RW", 524 from_kuid(&init_user_ns, uid), 525 from_kgid(&init_user_ns, gid)); 526 } 527 528 p = xdr_inline_decode(&stream, 4); 529 if (!p) 530 goto out_sort_mirrors; 531 fls->flags = be32_to_cpup(p); 532 533 p = xdr_inline_decode(&stream, 4); 534 if (!p) 535 goto out_sort_mirrors; 536 for (i=0; i < fls->mirror_array_cnt; i++) 537 fls->mirror_array[i]->report_interval = be32_to_cpup(p); 538 539 out_sort_mirrors: 540 ff_layout_sort_mirrors(fls); 541 ret = &fls->generic_hdr; 542 dprintk("<-- %s (success)\n", __func__); 543 out_free_page: 544 __free_page(scratch); 545 return ret; 546 out_err_free: 547 _ff_layout_free_lseg(fls); 548 ret = ERR_PTR(rc); 549 dprintk("<-- %s (%d)\n", __func__, rc); 550 goto out_free_page; 551 } 552 553 static void 554 ff_layout_free_lseg(struct pnfs_layout_segment *lseg) 555 { 556 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 557 558 dprintk("--> %s\n", __func__); 559 560 if (lseg->pls_range.iomode == IOMODE_RW) { 561 struct nfs4_flexfile_layout *ffl; 562 struct inode *inode; 563 564 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout); 565 inode = ffl->generic_hdr.plh_inode; 566 spin_lock(&inode->i_lock); 567 pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg); 568 spin_unlock(&inode->i_lock); 569 } 570 _ff_layout_free_lseg(fls); 571 } 572 573 static void 574 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 575 { 576 /* first IO request? */ 577 if (atomic_inc_return(&timer->n_ops) == 1) { 578 timer->start_time = now; 579 } 580 } 581 582 static ktime_t 583 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 584 { 585 ktime_t start; 586 587 if (atomic_dec_return(&timer->n_ops) < 0) 588 WARN_ON_ONCE(1); 589 590 start = timer->start_time; 591 timer->start_time = now; 592 return ktime_sub(now, start); 593 } 594 595 static bool 596 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 597 struct nfs4_ff_layoutstat *layoutstat, 598 ktime_t now) 599 { 600 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL; 601 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout); 602 603 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now); 604 if (!mirror->start_time) 605 mirror->start_time = now; 606 if (mirror->report_interval != 0) 607 report_interval = (s64)mirror->report_interval * 1000LL; 608 else if (layoutstats_timer != 0) 609 report_interval = (s64)layoutstats_timer * 1000LL; 610 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >= 611 report_interval) { 612 ffl->last_report_time = now; 613 return true; 614 } 615 616 return false; 617 } 618 619 static void 620 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat, 621 __u64 requested) 622 { 623 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 624 625 iostat->ops_requested++; 626 iostat->bytes_requested += requested; 627 } 628 629 static void 630 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat, 631 __u64 requested, 632 __u64 completed, 633 ktime_t time_completed, 634 ktime_t time_started) 635 { 636 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 637 ktime_t completion_time = ktime_sub(time_completed, time_started); 638 ktime_t timer; 639 640 iostat->ops_completed++; 641 iostat->bytes_completed += completed; 642 iostat->bytes_not_delivered += requested - completed; 643 644 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed); 645 iostat->total_busy_time = 646 ktime_add(iostat->total_busy_time, timer); 647 iostat->aggregate_completion_time = 648 ktime_add(iostat->aggregate_completion_time, 649 completion_time); 650 } 651 652 static void 653 nfs4_ff_layout_stat_io_start_read(struct inode *inode, 654 struct nfs4_ff_layout_mirror *mirror, 655 __u64 requested, ktime_t now) 656 { 657 bool report; 658 659 spin_lock(&mirror->lock); 660 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now); 661 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested); 662 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 663 spin_unlock(&mirror->lock); 664 665 if (report) 666 pnfs_report_layoutstat(inode, GFP_KERNEL); 667 } 668 669 static void 670 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task, 671 struct nfs4_ff_layout_mirror *mirror, 672 __u64 requested, 673 __u64 completed) 674 { 675 spin_lock(&mirror->lock); 676 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat, 677 requested, completed, 678 ktime_get(), task->tk_start); 679 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 680 spin_unlock(&mirror->lock); 681 } 682 683 static void 684 nfs4_ff_layout_stat_io_start_write(struct inode *inode, 685 struct nfs4_ff_layout_mirror *mirror, 686 __u64 requested, ktime_t now) 687 { 688 bool report; 689 690 spin_lock(&mirror->lock); 691 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now); 692 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested); 693 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 694 spin_unlock(&mirror->lock); 695 696 if (report) 697 pnfs_report_layoutstat(inode, GFP_NOIO); 698 } 699 700 static void 701 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, 702 struct nfs4_ff_layout_mirror *mirror, 703 __u64 requested, 704 __u64 completed, 705 enum nfs3_stable_how committed) 706 { 707 if (committed == NFS_UNSTABLE) 708 requested = completed = 0; 709 710 spin_lock(&mirror->lock); 711 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat, 712 requested, completed, ktime_get(), task->tk_start); 713 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 714 spin_unlock(&mirror->lock); 715 } 716 717 static void 718 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx) 719 { 720 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 721 722 if (devid) 723 nfs4_mark_deviceid_unavailable(devid); 724 } 725 726 static void 727 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx) 728 { 729 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 730 731 if (devid) 732 nfs4_mark_deviceid_available(devid); 733 } 734 735 static struct nfs4_pnfs_ds * 736 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, 737 u32 start_idx, u32 *best_idx, 738 bool check_device) 739 { 740 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 741 struct nfs4_ff_layout_mirror *mirror; 742 struct nfs4_pnfs_ds *ds; 743 u32 idx; 744 745 /* mirrors are initially sorted by efficiency */ 746 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 747 mirror = FF_LAYOUT_COMP(lseg, idx); 748 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 749 if (!ds) 750 continue; 751 752 if (check_device && 753 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node)) 754 continue; 755 756 *best_idx = idx; 757 return ds; 758 } 759 760 return NULL; 761 } 762 763 static struct nfs4_pnfs_ds * 764 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg, 765 u32 start_idx, u32 *best_idx) 766 { 767 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false); 768 } 769 770 static struct nfs4_pnfs_ds * 771 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg, 772 u32 start_idx, u32 *best_idx) 773 { 774 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true); 775 } 776 777 static struct nfs4_pnfs_ds * 778 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 779 u32 start_idx, u32 *best_idx) 780 { 781 struct nfs4_pnfs_ds *ds; 782 783 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx); 784 if (ds) 785 return ds; 786 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx); 787 } 788 789 static struct nfs4_pnfs_ds * 790 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio, 791 u32 *best_idx) 792 { 793 struct pnfs_layout_segment *lseg = pgio->pg_lseg; 794 struct nfs4_pnfs_ds *ds; 795 796 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx, 797 best_idx); 798 if (ds || !pgio->pg_mirror_idx) 799 return ds; 800 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx); 801 } 802 803 static void 804 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio, 805 struct nfs_page *req, 806 bool strict_iomode) 807 { 808 pnfs_put_lseg(pgio->pg_lseg); 809 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 810 nfs_req_openctx(req), 811 req_offset(req), 812 req->wb_bytes, 813 IOMODE_READ, 814 strict_iomode, 815 GFP_KERNEL); 816 if (IS_ERR(pgio->pg_lseg)) { 817 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 818 pgio->pg_lseg = NULL; 819 } 820 } 821 822 static void 823 ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio, 824 struct nfs_page *req) 825 { 826 pnfs_generic_pg_check_layout(pgio); 827 pnfs_generic_pg_check_range(pgio, req); 828 } 829 830 static void 831 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 832 struct nfs_page *req) 833 { 834 struct nfs_pgio_mirror *pgm; 835 struct nfs4_ff_layout_mirror *mirror; 836 struct nfs4_pnfs_ds *ds; 837 u32 ds_idx; 838 839 retry: 840 ff_layout_pg_check_layout(pgio, req); 841 /* Use full layout for now */ 842 if (!pgio->pg_lseg) { 843 ff_layout_pg_get_read(pgio, req, false); 844 if (!pgio->pg_lseg) 845 goto out_nolseg; 846 } 847 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 848 ff_layout_pg_get_read(pgio, req, true); 849 if (!pgio->pg_lseg) 850 goto out_nolseg; 851 } 852 853 ds = ff_layout_get_ds_for_read(pgio, &ds_idx); 854 if (!ds) { 855 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 856 goto out_mds; 857 pnfs_generic_pg_cleanup(pgio); 858 /* Sleep for 1 second before retrying */ 859 ssleep(1); 860 goto retry; 861 } 862 863 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 864 pgm = &pgio->pg_mirrors[0]; 865 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; 866 867 pgio->pg_mirror_idx = ds_idx; 868 869 if (NFS_SERVER(pgio->pg_inode)->flags & 870 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 871 pgio->pg_maxretrans = io_maxretrans; 872 return; 873 out_nolseg: 874 if (pgio->pg_error < 0) 875 return; 876 out_mds: 877 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode, 878 0, NFS4_MAX_UINT64, IOMODE_READ, 879 NFS_I(pgio->pg_inode)->layout, 880 pgio->pg_lseg); 881 pgio->pg_maxretrans = 0; 882 nfs_pageio_reset_read_mds(pgio); 883 } 884 885 static void 886 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 887 struct nfs_page *req) 888 { 889 struct nfs4_ff_layout_mirror *mirror; 890 struct nfs_pgio_mirror *pgm; 891 struct nfs4_pnfs_ds *ds; 892 u32 i; 893 894 retry: 895 ff_layout_pg_check_layout(pgio, req); 896 if (!pgio->pg_lseg) { 897 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 898 nfs_req_openctx(req), 899 req_offset(req), 900 req->wb_bytes, 901 IOMODE_RW, 902 false, 903 GFP_NOFS); 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 = pnfs_update_layout(pgio->pg_inode, 957 nfs_req_openctx(req), 958 req_offset(req), 959 req->wb_bytes, 960 IOMODE_RW, 961 false, 962 GFP_NOFS); 963 if (IS_ERR(pgio->pg_lseg)) { 964 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 965 pgio->pg_lseg = NULL; 966 goto out; 967 } 968 } 969 if (pgio->pg_lseg) 970 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 971 972 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode, 973 0, NFS4_MAX_UINT64, IOMODE_RW, 974 NFS_I(pgio->pg_inode)->layout, 975 pgio->pg_lseg); 976 /* no lseg means that pnfs is not in use, so no mirroring here */ 977 nfs_pageio_reset_write_mds(pgio); 978 out: 979 return 1; 980 } 981 982 static u32 983 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 984 { 985 u32 old = desc->pg_mirror_idx; 986 987 desc->pg_mirror_idx = idx; 988 return old; 989 } 990 991 static struct nfs_pgio_mirror * 992 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 993 { 994 return &desc->pg_mirrors[idx]; 995 } 996 997 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 998 .pg_init = ff_layout_pg_init_read, 999 .pg_test = pnfs_generic_pg_test, 1000 .pg_doio = pnfs_generic_pg_readpages, 1001 .pg_cleanup = pnfs_generic_pg_cleanup, 1002 }; 1003 1004 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 1005 .pg_init = ff_layout_pg_init_write, 1006 .pg_test = pnfs_generic_pg_test, 1007 .pg_doio = pnfs_generic_pg_writepages, 1008 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 1009 .pg_cleanup = pnfs_generic_pg_cleanup, 1010 .pg_get_mirror = ff_layout_pg_get_mirror_write, 1011 .pg_set_mirror = ff_layout_pg_set_mirror_write, 1012 }; 1013 1014 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 1015 { 1016 struct rpc_task *task = &hdr->task; 1017 1018 pnfs_layoutcommit_inode(hdr->inode, false); 1019 1020 if (retry_pnfs) { 1021 dprintk("%s Reset task %5u for i/o through pNFS " 1022 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1023 hdr->task.tk_pid, 1024 hdr->inode->i_sb->s_id, 1025 (unsigned long long)NFS_FILEID(hdr->inode), 1026 hdr->args.count, 1027 (unsigned long long)hdr->args.offset); 1028 1029 hdr->completion_ops->reschedule_io(hdr); 1030 return; 1031 } 1032 1033 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1034 dprintk("%s Reset task %5u for i/o through MDS " 1035 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1036 hdr->task.tk_pid, 1037 hdr->inode->i_sb->s_id, 1038 (unsigned long long)NFS_FILEID(hdr->inode), 1039 hdr->args.count, 1040 (unsigned long long)hdr->args.offset); 1041 1042 trace_pnfs_mds_fallback_write_done(hdr->inode, 1043 hdr->args.offset, hdr->args.count, 1044 IOMODE_RW, NFS_I(hdr->inode)->layout, 1045 hdr->lseg); 1046 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1047 } 1048 } 1049 1050 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr) 1051 { 1052 u32 idx = hdr->pgio_mirror_idx + 1; 1053 u32 new_idx = 0; 1054 1055 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx)) 1056 ff_layout_send_layouterror(hdr->lseg); 1057 else 1058 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1059 pnfs_read_resend_pnfs(hdr, new_idx); 1060 } 1061 1062 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1063 { 1064 struct rpc_task *task = &hdr->task; 1065 1066 pnfs_layoutcommit_inode(hdr->inode, false); 1067 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1068 1069 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1070 dprintk("%s Reset task %5u for i/o through MDS " 1071 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1072 hdr->task.tk_pid, 1073 hdr->inode->i_sb->s_id, 1074 (unsigned long long)NFS_FILEID(hdr->inode), 1075 hdr->args.count, 1076 (unsigned long long)hdr->args.offset); 1077 1078 trace_pnfs_mds_fallback_read_done(hdr->inode, 1079 hdr->args.offset, hdr->args.count, 1080 IOMODE_READ, NFS_I(hdr->inode)->layout, 1081 hdr->lseg); 1082 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1083 } 1084 } 1085 1086 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1087 struct nfs4_state *state, 1088 struct nfs_client *clp, 1089 struct pnfs_layout_segment *lseg, 1090 u32 idx) 1091 { 1092 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1093 struct inode *inode = lo->plh_inode; 1094 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1095 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1096 1097 switch (task->tk_status) { 1098 case -NFS4ERR_BADSESSION: 1099 case -NFS4ERR_BADSLOT: 1100 case -NFS4ERR_BAD_HIGH_SLOT: 1101 case -NFS4ERR_DEADSESSION: 1102 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1103 case -NFS4ERR_SEQ_FALSE_RETRY: 1104 case -NFS4ERR_SEQ_MISORDERED: 1105 dprintk("%s ERROR %d, Reset session. Exchangeid " 1106 "flags 0x%x\n", __func__, task->tk_status, 1107 clp->cl_exchange_flags); 1108 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1109 break; 1110 case -NFS4ERR_DELAY: 1111 case -NFS4ERR_GRACE: 1112 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1113 break; 1114 case -NFS4ERR_RETRY_UNCACHED_REP: 1115 break; 1116 /* Invalidate Layout errors */ 1117 case -NFS4ERR_PNFS_NO_LAYOUT: 1118 case -ESTALE: /* mapped NFS4ERR_STALE */ 1119 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 1120 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 1121 case -NFS4ERR_FHEXPIRED: 1122 case -NFS4ERR_WRONG_TYPE: 1123 dprintk("%s Invalid layout error %d\n", __func__, 1124 task->tk_status); 1125 /* 1126 * Destroy layout so new i/o will get a new layout. 1127 * Layout will not be destroyed until all current lseg 1128 * references are put. Mark layout as invalid to resend failed 1129 * i/o and all i/o waiting on the slot table to the MDS until 1130 * layout is destroyed and a new valid layout is obtained. 1131 */ 1132 pnfs_destroy_layout(NFS_I(inode)); 1133 rpc_wake_up(&tbl->slot_tbl_waitq); 1134 goto reset; 1135 /* RPC connection errors */ 1136 case -ECONNREFUSED: 1137 case -EHOSTDOWN: 1138 case -EHOSTUNREACH: 1139 case -ENETUNREACH: 1140 case -EIO: 1141 case -ETIMEDOUT: 1142 case -EPIPE: 1143 dprintk("%s DS connection error %d\n", __func__, 1144 task->tk_status); 1145 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1146 &devid->deviceid); 1147 rpc_wake_up(&tbl->slot_tbl_waitq); 1148 fallthrough; 1149 default: 1150 if (ff_layout_avoid_mds_available_ds(lseg)) 1151 return -NFS4ERR_RESET_TO_PNFS; 1152 reset: 1153 dprintk("%s Retry through MDS. Error %d\n", __func__, 1154 task->tk_status); 1155 return -NFS4ERR_RESET_TO_MDS; 1156 } 1157 task->tk_status = 0; 1158 return -EAGAIN; 1159 } 1160 1161 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1162 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1163 struct pnfs_layout_segment *lseg, 1164 u32 idx) 1165 { 1166 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1167 1168 switch (task->tk_status) { 1169 /* File access problems. Don't mark the device as unavailable */ 1170 case -EACCES: 1171 case -ESTALE: 1172 case -EISDIR: 1173 case -EBADHANDLE: 1174 case -ELOOP: 1175 case -ENOSPC: 1176 break; 1177 case -EJUKEBOX: 1178 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1179 goto out_retry; 1180 default: 1181 dprintk("%s DS connection error %d\n", __func__, 1182 task->tk_status); 1183 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1184 &devid->deviceid); 1185 } 1186 /* FIXME: Need to prevent infinite looping here. */ 1187 return -NFS4ERR_RESET_TO_PNFS; 1188 out_retry: 1189 task->tk_status = 0; 1190 rpc_restart_call_prepare(task); 1191 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1192 return -EAGAIN; 1193 } 1194 1195 static int ff_layout_async_handle_error(struct rpc_task *task, 1196 struct nfs4_state *state, 1197 struct nfs_client *clp, 1198 struct pnfs_layout_segment *lseg, 1199 u32 idx) 1200 { 1201 int vers = clp->cl_nfs_mod->rpc_vers->number; 1202 1203 if (task->tk_status >= 0) { 1204 ff_layout_mark_ds_reachable(lseg, idx); 1205 return 0; 1206 } 1207 1208 /* Handle the case of an invalid layout segment */ 1209 if (!pnfs_is_valid_lseg(lseg)) 1210 return -NFS4ERR_RESET_TO_PNFS; 1211 1212 switch (vers) { 1213 case 3: 1214 return ff_layout_async_handle_error_v3(task, lseg, idx); 1215 case 4: 1216 return ff_layout_async_handle_error_v4(task, state, clp, 1217 lseg, idx); 1218 default: 1219 /* should never happen */ 1220 WARN_ON_ONCE(1); 1221 return 0; 1222 } 1223 } 1224 1225 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1226 u32 idx, u64 offset, u64 length, 1227 u32 *op_status, int opnum, int error) 1228 { 1229 struct nfs4_ff_layout_mirror *mirror; 1230 u32 status = *op_status; 1231 int err; 1232 1233 if (status == 0) { 1234 switch (error) { 1235 case -ETIMEDOUT: 1236 case -EPFNOSUPPORT: 1237 case -EPROTONOSUPPORT: 1238 case -EOPNOTSUPP: 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 *op_status = status = NFS4ERR_NXIO; 1249 break; 1250 case -EACCES: 1251 *op_status = status = NFS4ERR_ACCESS; 1252 break; 1253 default: 1254 return; 1255 } 1256 } 1257 1258 mirror = FF_LAYOUT_COMP(lseg, idx); 1259 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1260 mirror, offset, length, status, opnum, 1261 GFP_NOIO); 1262 1263 switch (status) { 1264 case NFS4ERR_DELAY: 1265 case NFS4ERR_GRACE: 1266 break; 1267 case NFS4ERR_NXIO: 1268 ff_layout_mark_ds_unreachable(lseg, idx); 1269 /* 1270 * Don't return the layout if this is a read and we still 1271 * have layouts to try 1272 */ 1273 if (opnum == OP_READ) 1274 break; 1275 fallthrough; 1276 default: 1277 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, 1278 lseg); 1279 } 1280 1281 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1282 } 1283 1284 /* NFS_PROTO call done callback routines */ 1285 static int ff_layout_read_done_cb(struct rpc_task *task, 1286 struct nfs_pgio_header *hdr) 1287 { 1288 int err; 1289 1290 if (task->tk_status < 0) { 1291 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1292 hdr->args.offset, hdr->args.count, 1293 &hdr->res.op_status, OP_READ, 1294 task->tk_status); 1295 trace_ff_layout_read_error(hdr); 1296 } 1297 1298 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1299 hdr->ds_clp, hdr->lseg, 1300 hdr->pgio_mirror_idx); 1301 1302 trace_nfs4_pnfs_read(hdr, err); 1303 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1304 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1305 switch (err) { 1306 case -NFS4ERR_RESET_TO_PNFS: 1307 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1308 return task->tk_status; 1309 case -NFS4ERR_RESET_TO_MDS: 1310 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1311 return task->tk_status; 1312 case -EAGAIN: 1313 goto out_eagain; 1314 } 1315 1316 return 0; 1317 out_eagain: 1318 rpc_restart_call_prepare(task); 1319 return -EAGAIN; 1320 } 1321 1322 static bool 1323 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1324 { 1325 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1326 } 1327 1328 /* 1329 * We reference the rpc_cred of the first WRITE that triggers the need for 1330 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1331 * rfc5661 is not clear about which credential should be used. 1332 * 1333 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1334 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1335 * we always send layoutcommit after DS writes. 1336 */ 1337 static void 1338 ff_layout_set_layoutcommit(struct inode *inode, 1339 struct pnfs_layout_segment *lseg, 1340 loff_t end_offset) 1341 { 1342 if (!ff_layout_need_layoutcommit(lseg)) 1343 return; 1344 1345 pnfs_set_layoutcommit(inode, lseg, end_offset); 1346 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1347 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1348 } 1349 1350 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1351 struct nfs_pgio_header *hdr) 1352 { 1353 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1354 return; 1355 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1356 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1357 hdr->args.count, 1358 task->tk_start); 1359 } 1360 1361 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1362 struct nfs_pgio_header *hdr) 1363 { 1364 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1365 return; 1366 nfs4_ff_layout_stat_io_end_read(task, 1367 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1368 hdr->args.count, 1369 hdr->res.count); 1370 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1371 } 1372 1373 static int ff_layout_read_prepare_common(struct rpc_task *task, 1374 struct nfs_pgio_header *hdr) 1375 { 1376 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1377 rpc_exit(task, -EIO); 1378 return -EIO; 1379 } 1380 1381 ff_layout_read_record_layoutstats_start(task, hdr); 1382 return 0; 1383 } 1384 1385 /* 1386 * Call ops for the async read/write cases 1387 * In the case of dense layouts, the offset needs to be reset to its 1388 * original value. 1389 */ 1390 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1391 { 1392 struct nfs_pgio_header *hdr = data; 1393 1394 if (ff_layout_read_prepare_common(task, hdr)) 1395 return; 1396 1397 rpc_call_start(task); 1398 } 1399 1400 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1401 { 1402 struct nfs_pgio_header *hdr = data; 1403 1404 if (nfs4_setup_sequence(hdr->ds_clp, 1405 &hdr->args.seq_args, 1406 &hdr->res.seq_res, 1407 task)) 1408 return; 1409 1410 ff_layout_read_prepare_common(task, hdr); 1411 } 1412 1413 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1414 { 1415 struct nfs_pgio_header *hdr = data; 1416 1417 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 1418 1419 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1420 task->tk_status == 0) { 1421 nfs4_sequence_done(task, &hdr->res.seq_res); 1422 return; 1423 } 1424 1425 /* Note this may cause RPC to be resent */ 1426 hdr->mds_ops->rpc_call_done(task, hdr); 1427 } 1428 1429 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1430 { 1431 struct nfs_pgio_header *hdr = data; 1432 1433 ff_layout_read_record_layoutstats_done(task, hdr); 1434 rpc_count_iostats_metrics(task, 1435 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1436 } 1437 1438 static void ff_layout_read_release(void *data) 1439 { 1440 struct nfs_pgio_header *hdr = data; 1441 1442 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1443 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) 1444 ff_layout_resend_pnfs_read(hdr); 1445 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1446 ff_layout_reset_read(hdr); 1447 pnfs_generic_rw_release(data); 1448 } 1449 1450 1451 static int ff_layout_write_done_cb(struct rpc_task *task, 1452 struct nfs_pgio_header *hdr) 1453 { 1454 loff_t end_offs = 0; 1455 int err; 1456 1457 if (task->tk_status < 0) { 1458 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1459 hdr->args.offset, hdr->args.count, 1460 &hdr->res.op_status, OP_WRITE, 1461 task->tk_status); 1462 trace_ff_layout_write_error(hdr); 1463 } 1464 1465 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1466 hdr->ds_clp, hdr->lseg, 1467 hdr->pgio_mirror_idx); 1468 1469 trace_nfs4_pnfs_write(hdr, err); 1470 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1471 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1472 switch (err) { 1473 case -NFS4ERR_RESET_TO_PNFS: 1474 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1475 return task->tk_status; 1476 case -NFS4ERR_RESET_TO_MDS: 1477 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1478 return task->tk_status; 1479 case -EAGAIN: 1480 return -EAGAIN; 1481 } 1482 1483 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1484 hdr->res.verf->committed == NFS_DATA_SYNC) 1485 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1486 1487 /* Note: if the write is unstable, don't set end_offs until commit */ 1488 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1489 1490 /* zero out fattr since we don't care DS attr at all */ 1491 hdr->fattr.valid = 0; 1492 if (task->tk_status >= 0) 1493 nfs_writeback_update_inode(hdr); 1494 1495 return 0; 1496 } 1497 1498 static int ff_layout_commit_done_cb(struct rpc_task *task, 1499 struct nfs_commit_data *data) 1500 { 1501 int err; 1502 1503 if (task->tk_status < 0) { 1504 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index, 1505 data->args.offset, data->args.count, 1506 &data->res.op_status, OP_COMMIT, 1507 task->tk_status); 1508 trace_ff_layout_commit_error(data); 1509 } 1510 1511 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1512 data->lseg, data->ds_commit_index); 1513 1514 trace_nfs4_pnfs_commit_ds(data, err); 1515 switch (err) { 1516 case -NFS4ERR_RESET_TO_PNFS: 1517 pnfs_generic_prepare_to_resend_writes(data); 1518 return -EAGAIN; 1519 case -NFS4ERR_RESET_TO_MDS: 1520 pnfs_generic_prepare_to_resend_writes(data); 1521 return -EAGAIN; 1522 case -EAGAIN: 1523 rpc_restart_call_prepare(task); 1524 return -EAGAIN; 1525 } 1526 1527 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1528 1529 return 0; 1530 } 1531 1532 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1533 struct nfs_pgio_header *hdr) 1534 { 1535 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1536 return; 1537 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1538 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1539 hdr->args.count, 1540 task->tk_start); 1541 } 1542 1543 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1544 struct nfs_pgio_header *hdr) 1545 { 1546 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1547 return; 1548 nfs4_ff_layout_stat_io_end_write(task, 1549 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1550 hdr->args.count, hdr->res.count, 1551 hdr->res.verf->committed); 1552 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1553 } 1554 1555 static int ff_layout_write_prepare_common(struct rpc_task *task, 1556 struct nfs_pgio_header *hdr) 1557 { 1558 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1559 rpc_exit(task, -EIO); 1560 return -EIO; 1561 } 1562 1563 ff_layout_write_record_layoutstats_start(task, hdr); 1564 return 0; 1565 } 1566 1567 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1568 { 1569 struct nfs_pgio_header *hdr = data; 1570 1571 if (ff_layout_write_prepare_common(task, hdr)) 1572 return; 1573 1574 rpc_call_start(task); 1575 } 1576 1577 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1578 { 1579 struct nfs_pgio_header *hdr = data; 1580 1581 if (nfs4_setup_sequence(hdr->ds_clp, 1582 &hdr->args.seq_args, 1583 &hdr->res.seq_res, 1584 task)) 1585 return; 1586 1587 ff_layout_write_prepare_common(task, hdr); 1588 } 1589 1590 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1591 { 1592 struct nfs_pgio_header *hdr = data; 1593 1594 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1595 task->tk_status == 0) { 1596 nfs4_sequence_done(task, &hdr->res.seq_res); 1597 return; 1598 } 1599 1600 /* Note this may cause RPC to be resent */ 1601 hdr->mds_ops->rpc_call_done(task, hdr); 1602 } 1603 1604 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1605 { 1606 struct nfs_pgio_header *hdr = data; 1607 1608 ff_layout_write_record_layoutstats_done(task, hdr); 1609 rpc_count_iostats_metrics(task, 1610 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1611 } 1612 1613 static void ff_layout_write_release(void *data) 1614 { 1615 struct nfs_pgio_header *hdr = data; 1616 1617 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1618 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1619 ff_layout_send_layouterror(hdr->lseg); 1620 ff_layout_reset_write(hdr, true); 1621 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1622 ff_layout_reset_write(hdr, false); 1623 pnfs_generic_rw_release(data); 1624 } 1625 1626 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1627 struct nfs_commit_data *cdata) 1628 { 1629 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1630 return; 1631 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1632 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1633 0, task->tk_start); 1634 } 1635 1636 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1637 struct nfs_commit_data *cdata) 1638 { 1639 struct nfs_page *req; 1640 __u64 count = 0; 1641 1642 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1643 return; 1644 1645 if (task->tk_status == 0) { 1646 list_for_each_entry(req, &cdata->pages, wb_list) 1647 count += req->wb_bytes; 1648 } 1649 nfs4_ff_layout_stat_io_end_write(task, 1650 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1651 count, count, NFS_FILE_SYNC); 1652 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 1653 } 1654 1655 static void ff_layout_commit_prepare_common(struct rpc_task *task, 1656 struct nfs_commit_data *cdata) 1657 { 1658 ff_layout_commit_record_layoutstats_start(task, cdata); 1659 } 1660 1661 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1662 { 1663 ff_layout_commit_prepare_common(task, data); 1664 rpc_call_start(task); 1665 } 1666 1667 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1668 { 1669 struct nfs_commit_data *wdata = data; 1670 1671 if (nfs4_setup_sequence(wdata->ds_clp, 1672 &wdata->args.seq_args, 1673 &wdata->res.seq_res, 1674 task)) 1675 return; 1676 ff_layout_commit_prepare_common(task, data); 1677 } 1678 1679 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1680 { 1681 pnfs_generic_write_commit_done(task, data); 1682 } 1683 1684 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1685 { 1686 struct nfs_commit_data *cdata = data; 1687 1688 ff_layout_commit_record_layoutstats_done(task, cdata); 1689 rpc_count_iostats_metrics(task, 1690 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1691 } 1692 1693 static void ff_layout_commit_release(void *data) 1694 { 1695 struct nfs_commit_data *cdata = data; 1696 1697 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1698 pnfs_generic_commit_release(data); 1699 } 1700 1701 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1702 .rpc_call_prepare = ff_layout_read_prepare_v3, 1703 .rpc_call_done = ff_layout_read_call_done, 1704 .rpc_count_stats = ff_layout_read_count_stats, 1705 .rpc_release = ff_layout_read_release, 1706 }; 1707 1708 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 1709 .rpc_call_prepare = ff_layout_read_prepare_v4, 1710 .rpc_call_done = ff_layout_read_call_done, 1711 .rpc_count_stats = ff_layout_read_count_stats, 1712 .rpc_release = ff_layout_read_release, 1713 }; 1714 1715 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1716 .rpc_call_prepare = ff_layout_write_prepare_v3, 1717 .rpc_call_done = ff_layout_write_call_done, 1718 .rpc_count_stats = ff_layout_write_count_stats, 1719 .rpc_release = ff_layout_write_release, 1720 }; 1721 1722 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1723 .rpc_call_prepare = ff_layout_write_prepare_v4, 1724 .rpc_call_done = ff_layout_write_call_done, 1725 .rpc_count_stats = ff_layout_write_count_stats, 1726 .rpc_release = ff_layout_write_release, 1727 }; 1728 1729 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 1730 .rpc_call_prepare = ff_layout_commit_prepare_v3, 1731 .rpc_call_done = ff_layout_commit_done, 1732 .rpc_count_stats = ff_layout_commit_count_stats, 1733 .rpc_release = ff_layout_commit_release, 1734 }; 1735 1736 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 1737 .rpc_call_prepare = ff_layout_commit_prepare_v4, 1738 .rpc_call_done = ff_layout_commit_done, 1739 .rpc_count_stats = ff_layout_commit_count_stats, 1740 .rpc_release = ff_layout_commit_release, 1741 }; 1742 1743 static enum pnfs_try_status 1744 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 1745 { 1746 struct pnfs_layout_segment *lseg = hdr->lseg; 1747 struct nfs4_pnfs_ds *ds; 1748 struct rpc_clnt *ds_clnt; 1749 struct nfs4_ff_layout_mirror *mirror; 1750 const struct cred *ds_cred; 1751 loff_t offset = hdr->args.offset; 1752 u32 idx = hdr->pgio_mirror_idx; 1753 int vers; 1754 struct nfs_fh *fh; 1755 1756 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 1757 __func__, hdr->inode->i_ino, 1758 hdr->args.pgbase, (size_t)hdr->args.count, offset); 1759 1760 mirror = FF_LAYOUT_COMP(lseg, idx); 1761 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 1762 if (!ds) 1763 goto out_failed; 1764 1765 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1766 hdr->inode); 1767 if (IS_ERR(ds_clnt)) 1768 goto out_failed; 1769 1770 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1771 if (!ds_cred) 1772 goto out_failed; 1773 1774 vers = nfs4_ff_layout_ds_version(mirror); 1775 1776 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 1777 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 1778 1779 hdr->pgio_done_cb = ff_layout_read_done_cb; 1780 refcount_inc(&ds->ds_clp->cl_count); 1781 hdr->ds_clp = ds->ds_clp; 1782 fh = nfs4_ff_layout_select_ds_fh(mirror); 1783 if (fh) 1784 hdr->args.fh = fh; 1785 1786 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1787 1788 /* 1789 * Note that if we ever decide to split across DSes, 1790 * then we may need to handle dense-like offsets. 1791 */ 1792 hdr->args.offset = offset; 1793 hdr->mds_offset = offset; 1794 1795 /* Perform an asynchronous read to ds */ 1796 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1797 vers == 3 ? &ff_layout_read_call_ops_v3 : 1798 &ff_layout_read_call_ops_v4, 1799 0, RPC_TASK_SOFTCONN); 1800 put_cred(ds_cred); 1801 return PNFS_ATTEMPTED; 1802 1803 out_failed: 1804 if (ff_layout_avoid_mds_available_ds(lseg)) 1805 return PNFS_TRY_AGAIN; 1806 trace_pnfs_mds_fallback_read_pagelist(hdr->inode, 1807 hdr->args.offset, hdr->args.count, 1808 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg); 1809 return PNFS_NOT_ATTEMPTED; 1810 } 1811 1812 /* Perform async writes. */ 1813 static enum pnfs_try_status 1814 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 1815 { 1816 struct pnfs_layout_segment *lseg = hdr->lseg; 1817 struct nfs4_pnfs_ds *ds; 1818 struct rpc_clnt *ds_clnt; 1819 struct nfs4_ff_layout_mirror *mirror; 1820 const struct cred *ds_cred; 1821 loff_t offset = hdr->args.offset; 1822 int vers; 1823 struct nfs_fh *fh; 1824 u32 idx = hdr->pgio_mirror_idx; 1825 1826 mirror = FF_LAYOUT_COMP(lseg, idx); 1827 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1828 if (!ds) 1829 goto out_failed; 1830 1831 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1832 hdr->inode); 1833 if (IS_ERR(ds_clnt)) 1834 goto out_failed; 1835 1836 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1837 if (!ds_cred) 1838 goto out_failed; 1839 1840 vers = nfs4_ff_layout_ds_version(mirror); 1841 1842 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 1843 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 1844 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 1845 vers); 1846 1847 hdr->pgio_done_cb = ff_layout_write_done_cb; 1848 refcount_inc(&ds->ds_clp->cl_count); 1849 hdr->ds_clp = ds->ds_clp; 1850 hdr->ds_commit_idx = idx; 1851 fh = nfs4_ff_layout_select_ds_fh(mirror); 1852 if (fh) 1853 hdr->args.fh = fh; 1854 1855 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1856 1857 /* 1858 * Note that if we ever decide to split across DSes, 1859 * then we may need to handle dense-like offsets. 1860 */ 1861 hdr->args.offset = offset; 1862 1863 /* Perform an asynchronous write */ 1864 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1865 vers == 3 ? &ff_layout_write_call_ops_v3 : 1866 &ff_layout_write_call_ops_v4, 1867 sync, RPC_TASK_SOFTCONN); 1868 put_cred(ds_cred); 1869 return PNFS_ATTEMPTED; 1870 1871 out_failed: 1872 if (ff_layout_avoid_mds_available_ds(lseg)) 1873 return PNFS_TRY_AGAIN; 1874 trace_pnfs_mds_fallback_write_pagelist(hdr->inode, 1875 hdr->args.offset, hdr->args.count, 1876 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg); 1877 return PNFS_NOT_ATTEMPTED; 1878 } 1879 1880 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1881 { 1882 return i; 1883 } 1884 1885 static struct nfs_fh * 1886 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1887 { 1888 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1889 1890 /* FIXME: Assume that there is only one NFS version available 1891 * for the DS. 1892 */ 1893 return &flseg->mirror_array[i]->fh_versions[0]; 1894 } 1895 1896 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 1897 { 1898 struct pnfs_layout_segment *lseg = data->lseg; 1899 struct nfs4_pnfs_ds *ds; 1900 struct rpc_clnt *ds_clnt; 1901 struct nfs4_ff_layout_mirror *mirror; 1902 const struct cred *ds_cred; 1903 u32 idx; 1904 int vers, ret; 1905 struct nfs_fh *fh; 1906 1907 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 1908 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 1909 goto out_err; 1910 1911 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1912 mirror = FF_LAYOUT_COMP(lseg, idx); 1913 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1914 if (!ds) 1915 goto out_err; 1916 1917 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1918 data->inode); 1919 if (IS_ERR(ds_clnt)) 1920 goto out_err; 1921 1922 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred); 1923 if (!ds_cred) 1924 goto out_err; 1925 1926 vers = nfs4_ff_layout_ds_version(mirror); 1927 1928 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 1929 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 1930 vers); 1931 data->commit_done_cb = ff_layout_commit_done_cb; 1932 data->cred = ds_cred; 1933 refcount_inc(&ds->ds_clp->cl_count); 1934 data->ds_clp = ds->ds_clp; 1935 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1936 if (fh) 1937 data->args.fh = fh; 1938 1939 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 1940 vers == 3 ? &ff_layout_commit_call_ops_v3 : 1941 &ff_layout_commit_call_ops_v4, 1942 how, RPC_TASK_SOFTCONN); 1943 put_cred(ds_cred); 1944 return ret; 1945 out_err: 1946 pnfs_generic_prepare_to_resend_writes(data); 1947 pnfs_generic_commit_release(data); 1948 return -EAGAIN; 1949 } 1950 1951 static int 1952 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1953 int how, struct nfs_commit_info *cinfo) 1954 { 1955 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1956 ff_layout_initiate_commit); 1957 } 1958 1959 static struct pnfs_ds_commit_info * 1960 ff_layout_get_ds_info(struct inode *inode) 1961 { 1962 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1963 1964 if (layout == NULL) 1965 return NULL; 1966 1967 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 1968 } 1969 1970 static void 1971 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 1972 struct pnfs_layout_segment *lseg) 1973 { 1974 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1975 struct inode *inode = lseg->pls_layout->plh_inode; 1976 struct pnfs_commit_array *array, *new; 1977 1978 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt, GFP_NOIO); 1979 if (new) { 1980 spin_lock(&inode->i_lock); 1981 array = pnfs_add_commit_array(fl_cinfo, new, lseg); 1982 spin_unlock(&inode->i_lock); 1983 if (array != new) 1984 pnfs_free_commit_array(new); 1985 } 1986 } 1987 1988 static void 1989 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 1990 struct inode *inode) 1991 { 1992 spin_lock(&inode->i_lock); 1993 pnfs_generic_ds_cinfo_destroy(fl_cinfo); 1994 spin_unlock(&inode->i_lock); 1995 } 1996 1997 static void 1998 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 1999 { 2000 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 2001 id_node)); 2002 } 2003 2004 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 2005 const struct nfs4_layoutreturn_args *args, 2006 const struct nfs4_flexfile_layoutreturn_args *ff_args) 2007 { 2008 __be32 *start; 2009 2010 start = xdr_reserve_space(xdr, 4); 2011 if (unlikely(!start)) 2012 return -E2BIG; 2013 2014 *start = cpu_to_be32(ff_args->num_errors); 2015 /* This assume we always return _ALL_ layouts */ 2016 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 2017 } 2018 2019 static void 2020 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len) 2021 { 2022 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0); 2023 } 2024 2025 static void 2026 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 2027 const nfs4_stateid *stateid, 2028 const struct nfs42_layoutstat_devinfo *devinfo) 2029 { 2030 __be32 *p; 2031 2032 p = xdr_reserve_space(xdr, 8 + 8); 2033 p = xdr_encode_hyper(p, devinfo->offset); 2034 p = xdr_encode_hyper(p, devinfo->length); 2035 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 2036 p = xdr_reserve_space(xdr, 4*8); 2037 p = xdr_encode_hyper(p, devinfo->read_count); 2038 p = xdr_encode_hyper(p, devinfo->read_bytes); 2039 p = xdr_encode_hyper(p, devinfo->write_count); 2040 p = xdr_encode_hyper(p, devinfo->write_bytes); 2041 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 2042 } 2043 2044 static void 2045 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 2046 const nfs4_stateid *stateid, 2047 const struct nfs42_layoutstat_devinfo *devinfo) 2048 { 2049 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 2050 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 2051 devinfo->ld_private.data); 2052 } 2053 2054 /* report nothing for now */ 2055 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 2056 const struct nfs4_layoutreturn_args *args, 2057 struct nfs4_flexfile_layoutreturn_args *ff_args) 2058 { 2059 __be32 *p; 2060 int i; 2061 2062 p = xdr_reserve_space(xdr, 4); 2063 *p = cpu_to_be32(ff_args->num_dev); 2064 for (i = 0; i < ff_args->num_dev; i++) 2065 ff_layout_encode_ff_iostat(xdr, 2066 &args->layout->plh_stateid, 2067 &ff_args->devinfo[i]); 2068 } 2069 2070 static void 2071 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 2072 unsigned int num_entries) 2073 { 2074 unsigned int i; 2075 2076 for (i = 0; i < num_entries; i++) { 2077 if (!devinfo[i].ld_private.ops) 2078 continue; 2079 if (!devinfo[i].ld_private.ops->free) 2080 continue; 2081 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 2082 } 2083 } 2084 2085 static struct nfs4_deviceid_node * 2086 ff_layout_alloc_deviceid_node(struct nfs_server *server, 2087 struct pnfs_device *pdev, gfp_t gfp_flags) 2088 { 2089 struct nfs4_ff_layout_ds *dsaddr; 2090 2091 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2092 if (!dsaddr) 2093 return NULL; 2094 return &dsaddr->id_node; 2095 } 2096 2097 static void 2098 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2099 const void *voidargs, 2100 const struct nfs4_xdr_opaque_data *ff_opaque) 2101 { 2102 const struct nfs4_layoutreturn_args *args = voidargs; 2103 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2104 struct xdr_buf tmp_buf = { 2105 .head = { 2106 [0] = { 2107 .iov_base = page_address(ff_args->pages[0]), 2108 }, 2109 }, 2110 .buflen = PAGE_SIZE, 2111 }; 2112 struct xdr_stream tmp_xdr; 2113 __be32 *start; 2114 2115 dprintk("%s: Begin\n", __func__); 2116 2117 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL); 2118 2119 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2120 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2121 2122 start = xdr_reserve_space(xdr, 4); 2123 *start = cpu_to_be32(tmp_buf.len); 2124 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2125 2126 dprintk("%s: Return\n", __func__); 2127 } 2128 2129 static void 2130 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2131 { 2132 struct nfs4_flexfile_layoutreturn_args *ff_args; 2133 2134 if (!args->data) 2135 return; 2136 ff_args = args->data; 2137 args->data = NULL; 2138 2139 ff_layout_free_ds_ioerr(&ff_args->errors); 2140 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2141 2142 put_page(ff_args->pages[0]); 2143 kfree(ff_args); 2144 } 2145 2146 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2147 .encode = ff_layout_encode_layoutreturn, 2148 .free = ff_layout_free_layoutreturn, 2149 }; 2150 2151 static int 2152 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2153 { 2154 struct nfs4_flexfile_layoutreturn_args *ff_args; 2155 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2156 2157 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL); 2158 if (!ff_args) 2159 goto out_nomem; 2160 ff_args->pages[0] = alloc_page(GFP_KERNEL); 2161 if (!ff_args->pages[0]) 2162 goto out_nomem_free; 2163 2164 INIT_LIST_HEAD(&ff_args->errors); 2165 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2166 &args->range, &ff_args->errors, 2167 FF_LAYOUTRETURN_MAXERR); 2168 2169 spin_lock(&args->inode->i_lock); 2170 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2171 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo)); 2172 spin_unlock(&args->inode->i_lock); 2173 2174 args->ld_private->ops = &layoutreturn_ops; 2175 args->ld_private->data = ff_args; 2176 return 0; 2177 out_nomem_free: 2178 kfree(ff_args); 2179 out_nomem: 2180 return -ENOMEM; 2181 } 2182 2183 #ifdef CONFIG_NFS_V4_2 2184 void 2185 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2186 { 2187 struct pnfs_layout_hdr *lo = lseg->pls_layout; 2188 struct nfs42_layout_error *errors; 2189 LIST_HEAD(head); 2190 2191 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) 2192 return; 2193 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); 2194 if (list_empty(&head)) 2195 return; 2196 2197 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, 2198 sizeof(*errors), GFP_NOFS); 2199 if (errors != NULL) { 2200 const struct nfs4_ff_layout_ds_err *pos; 2201 size_t n = 0; 2202 2203 list_for_each_entry(pos, &head, list) { 2204 errors[n].offset = pos->offset; 2205 errors[n].length = pos->length; 2206 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); 2207 errors[n].errors[0].dev_id = pos->deviceid; 2208 errors[n].errors[0].status = pos->status; 2209 errors[n].errors[0].opnum = pos->opnum; 2210 n++; 2211 if (!list_is_last(&pos->list, &head) && 2212 n < NFS42_LAYOUTERROR_MAX) 2213 continue; 2214 if (nfs42_proc_layouterror(lseg, errors, n) < 0) 2215 break; 2216 n = 0; 2217 } 2218 kfree(errors); 2219 } 2220 ff_layout_free_ds_ioerr(&head); 2221 } 2222 #else 2223 void 2224 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2225 { 2226 } 2227 #endif 2228 2229 static int 2230 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2231 { 2232 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2233 2234 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2235 } 2236 2237 static size_t 2238 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2239 const int buflen) 2240 { 2241 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2242 const struct in6_addr *addr = &sin6->sin6_addr; 2243 2244 /* 2245 * RFC 4291, Section 2.2.2 2246 * 2247 * Shorthanded ANY address 2248 */ 2249 if (ipv6_addr_any(addr)) 2250 return snprintf(buf, buflen, "::"); 2251 2252 /* 2253 * RFC 4291, Section 2.2.2 2254 * 2255 * Shorthanded loopback address 2256 */ 2257 if (ipv6_addr_loopback(addr)) 2258 return snprintf(buf, buflen, "::1"); 2259 2260 /* 2261 * RFC 4291, Section 2.2.3 2262 * 2263 * Special presentation address format for mapped v4 2264 * addresses. 2265 */ 2266 if (ipv6_addr_v4mapped(addr)) 2267 return snprintf(buf, buflen, "::ffff:%pI4", 2268 &addr->s6_addr32[3]); 2269 2270 /* 2271 * RFC 4291, Section 2.2.1 2272 */ 2273 return snprintf(buf, buflen, "%pI6c", addr); 2274 } 2275 2276 /* Derived from rpc_sockaddr2uaddr */ 2277 static void 2278 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2279 { 2280 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2281 char portbuf[RPCBIND_MAXUADDRPLEN]; 2282 char addrbuf[RPCBIND_MAXUADDRLEN]; 2283 unsigned short port; 2284 int len, netid_len; 2285 __be32 *p; 2286 2287 switch (sap->sa_family) { 2288 case AF_INET: 2289 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2290 return; 2291 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2292 break; 2293 case AF_INET6: 2294 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2295 return; 2296 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2297 break; 2298 default: 2299 WARN_ON_ONCE(1); 2300 return; 2301 } 2302 2303 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2304 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2305 2306 netid_len = strlen(da->da_netid); 2307 p = xdr_reserve_space(xdr, 4 + netid_len); 2308 xdr_encode_opaque(p, da->da_netid, netid_len); 2309 2310 p = xdr_reserve_space(xdr, 4 + len); 2311 xdr_encode_opaque(p, addrbuf, len); 2312 } 2313 2314 static void 2315 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2316 ktime_t t) 2317 { 2318 struct timespec64 ts; 2319 __be32 *p; 2320 2321 p = xdr_reserve_space(xdr, 12); 2322 ts = ktime_to_timespec64(t); 2323 p = xdr_encode_hyper(p, ts.tv_sec); 2324 *p++ = cpu_to_be32(ts.tv_nsec); 2325 } 2326 2327 static void 2328 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2329 struct nfs4_ff_io_stat *stat) 2330 { 2331 __be32 *p; 2332 2333 p = xdr_reserve_space(xdr, 5 * 8); 2334 p = xdr_encode_hyper(p, stat->ops_requested); 2335 p = xdr_encode_hyper(p, stat->bytes_requested); 2336 p = xdr_encode_hyper(p, stat->ops_completed); 2337 p = xdr_encode_hyper(p, stat->bytes_completed); 2338 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2339 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2340 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2341 } 2342 2343 static void 2344 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2345 const struct nfs42_layoutstat_devinfo *devinfo, 2346 struct nfs4_ff_layout_mirror *mirror) 2347 { 2348 struct nfs4_pnfs_ds_addr *da; 2349 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds; 2350 struct nfs_fh *fh = &mirror->fh_versions[0]; 2351 __be32 *p; 2352 2353 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2354 dprintk("%s: DS %s: encoding address %s\n", 2355 __func__, ds->ds_remotestr, da->da_remotestr); 2356 /* netaddr4 */ 2357 ff_layout_encode_netaddr(xdr, da); 2358 /* nfs_fh4 */ 2359 p = xdr_reserve_space(xdr, 4 + fh->size); 2360 xdr_encode_opaque(p, fh->data, fh->size); 2361 /* ff_io_latency4 read */ 2362 spin_lock(&mirror->lock); 2363 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat); 2364 /* ff_io_latency4 write */ 2365 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat); 2366 spin_unlock(&mirror->lock); 2367 /* nfstime4 */ 2368 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time)); 2369 /* bool */ 2370 p = xdr_reserve_space(xdr, 4); 2371 *p = cpu_to_be32(false); 2372 } 2373 2374 static void 2375 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2376 const struct nfs4_xdr_opaque_data *opaque) 2377 { 2378 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2379 struct nfs42_layoutstat_devinfo, ld_private); 2380 __be32 *start; 2381 2382 /* layoutupdate length */ 2383 start = xdr_reserve_space(xdr, 4); 2384 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2385 2386 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2387 } 2388 2389 static void 2390 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2391 { 2392 struct nfs4_ff_layout_mirror *mirror = opaque->data; 2393 2394 ff_layout_put_mirror(mirror); 2395 } 2396 2397 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2398 .encode = ff_layout_encode_layoutstats, 2399 .free = ff_layout_free_layoutstats, 2400 }; 2401 2402 static int 2403 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2404 struct nfs42_layoutstat_devinfo *devinfo, 2405 int dev_limit) 2406 { 2407 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2408 struct nfs4_ff_layout_mirror *mirror; 2409 struct nfs4_deviceid_node *dev; 2410 int i = 0; 2411 2412 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2413 if (i >= dev_limit) 2414 break; 2415 if (IS_ERR_OR_NULL(mirror->mirror_ds)) 2416 continue; 2417 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags)) 2418 continue; 2419 /* mirror refcount put in cleanup_layoutstats */ 2420 if (!refcount_inc_not_zero(&mirror->ref)) 2421 continue; 2422 dev = &mirror->mirror_ds->id_node; 2423 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE); 2424 devinfo->offset = 0; 2425 devinfo->length = NFS4_MAX_UINT64; 2426 spin_lock(&mirror->lock); 2427 devinfo->read_count = mirror->read_stat.io_stat.ops_completed; 2428 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed; 2429 devinfo->write_count = mirror->write_stat.io_stat.ops_completed; 2430 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed; 2431 spin_unlock(&mirror->lock); 2432 devinfo->layout_type = LAYOUT_FLEX_FILES; 2433 devinfo->ld_private.ops = &layoutstat_ops; 2434 devinfo->ld_private.data = mirror; 2435 2436 devinfo++; 2437 i++; 2438 } 2439 return i; 2440 } 2441 2442 static int 2443 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2444 { 2445 struct nfs4_flexfile_layout *ff_layout; 2446 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2447 2448 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2449 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO); 2450 if (!args->devinfo) 2451 return -ENOMEM; 2452 2453 spin_lock(&args->inode->i_lock); 2454 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout); 2455 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2456 &args->devinfo[0], dev_count); 2457 spin_unlock(&args->inode->i_lock); 2458 if (!args->num_dev) { 2459 kfree(args->devinfo); 2460 args->devinfo = NULL; 2461 return -ENOENT; 2462 } 2463 2464 return 0; 2465 } 2466 2467 static int 2468 ff_layout_set_layoutdriver(struct nfs_server *server, 2469 const struct nfs_fh *dummy) 2470 { 2471 #if IS_ENABLED(CONFIG_NFS_V4_2) 2472 server->caps |= NFS_CAP_LAYOUTSTATS; 2473 #endif 2474 return 0; 2475 } 2476 2477 static const struct pnfs_commit_ops ff_layout_commit_ops = { 2478 .setup_ds_info = ff_layout_setup_ds_info, 2479 .release_ds_info = ff_layout_release_ds_info, 2480 .mark_request_commit = pnfs_layout_mark_request_commit, 2481 .clear_request_commit = pnfs_generic_clear_request_commit, 2482 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2483 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2484 .commit_pagelist = ff_layout_commit_pagelist, 2485 }; 2486 2487 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2488 .id = LAYOUT_FLEX_FILES, 2489 .name = "LAYOUT_FLEX_FILES", 2490 .owner = THIS_MODULE, 2491 .flags = PNFS_LAYOUTGET_ON_OPEN, 2492 .max_layoutget_response = 4096, /* 1 page or so... */ 2493 .set_layoutdriver = ff_layout_set_layoutdriver, 2494 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2495 .free_layout_hdr = ff_layout_free_layout_hdr, 2496 .alloc_lseg = ff_layout_alloc_lseg, 2497 .free_lseg = ff_layout_free_lseg, 2498 .add_lseg = ff_layout_add_lseg, 2499 .pg_read_ops = &ff_layout_pg_read_ops, 2500 .pg_write_ops = &ff_layout_pg_write_ops, 2501 .get_ds_info = ff_layout_get_ds_info, 2502 .free_deviceid_node = ff_layout_free_deviceid_node, 2503 .read_pagelist = ff_layout_read_pagelist, 2504 .write_pagelist = ff_layout_write_pagelist, 2505 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 2506 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 2507 .sync = pnfs_nfs_generic_sync, 2508 .prepare_layoutstats = ff_layout_prepare_layoutstats, 2509 }; 2510 2511 static int __init nfs4flexfilelayout_init(void) 2512 { 2513 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 2514 __func__); 2515 return pnfs_register_layoutdriver(&flexfilelayout_type); 2516 } 2517 2518 static void __exit nfs4flexfilelayout_exit(void) 2519 { 2520 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 2521 __func__); 2522 pnfs_unregister_layoutdriver(&flexfilelayout_type); 2523 } 2524 2525 MODULE_ALIAS("nfs-layouttype4-4"); 2526 2527 MODULE_LICENSE("GPL"); 2528 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 2529 2530 module_init(nfs4flexfilelayout_init); 2531 module_exit(nfs4flexfilelayout_exit); 2532 2533 module_param(io_maxretrans, ushort, 0644); 2534 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client " 2535 "retries an I/O request before returning an error. "); 2536