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_buffer(&stream, page_address(scratch), PAGE_SIZE); 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 bool fail_return = false; 744 u32 idx; 745 746 /* mirrors are initially sorted by efficiency */ 747 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 748 if (idx+1 == fls->mirror_array_cnt) 749 fail_return = !check_device; 750 751 mirror = FF_LAYOUT_COMP(lseg, idx); 752 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return); 753 if (!ds) 754 continue; 755 756 if (check_device && 757 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node)) 758 continue; 759 760 *best_idx = idx; 761 return ds; 762 } 763 764 return NULL; 765 } 766 767 static struct nfs4_pnfs_ds * 768 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg, 769 u32 start_idx, u32 *best_idx) 770 { 771 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false); 772 } 773 774 static struct nfs4_pnfs_ds * 775 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg, 776 u32 start_idx, u32 *best_idx) 777 { 778 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true); 779 } 780 781 static struct nfs4_pnfs_ds * 782 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 783 u32 start_idx, u32 *best_idx) 784 { 785 struct nfs4_pnfs_ds *ds; 786 787 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx); 788 if (ds) 789 return ds; 790 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx); 791 } 792 793 static struct nfs4_pnfs_ds * 794 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio, 795 u32 *best_idx) 796 { 797 struct pnfs_layout_segment *lseg = pgio->pg_lseg; 798 struct nfs4_pnfs_ds *ds; 799 800 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx, 801 best_idx); 802 if (ds || !pgio->pg_mirror_idx) 803 return ds; 804 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx); 805 } 806 807 static void 808 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio, 809 struct nfs_page *req, 810 bool strict_iomode) 811 { 812 pnfs_put_lseg(pgio->pg_lseg); 813 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 814 nfs_req_openctx(req), 815 req_offset(req), 816 req->wb_bytes, 817 IOMODE_READ, 818 strict_iomode, 819 GFP_KERNEL); 820 if (IS_ERR(pgio->pg_lseg)) { 821 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 822 pgio->pg_lseg = NULL; 823 } 824 } 825 826 static void 827 ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio, 828 struct nfs_page *req) 829 { 830 pnfs_generic_pg_check_layout(pgio); 831 pnfs_generic_pg_check_range(pgio, req); 832 } 833 834 static void 835 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 836 struct nfs_page *req) 837 { 838 struct nfs_pgio_mirror *pgm; 839 struct nfs4_ff_layout_mirror *mirror; 840 struct nfs4_pnfs_ds *ds; 841 u32 ds_idx; 842 843 retry: 844 ff_layout_pg_check_layout(pgio, req); 845 /* Use full layout for now */ 846 if (!pgio->pg_lseg) { 847 ff_layout_pg_get_read(pgio, req, false); 848 if (!pgio->pg_lseg) 849 goto out_nolseg; 850 } 851 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 852 ff_layout_pg_get_read(pgio, req, true); 853 if (!pgio->pg_lseg) 854 goto out_nolseg; 855 } 856 857 ds = ff_layout_get_ds_for_read(pgio, &ds_idx); 858 if (!ds) { 859 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 860 goto out_mds; 861 pnfs_generic_pg_cleanup(pgio); 862 /* Sleep for 1 second before retrying */ 863 ssleep(1); 864 goto retry; 865 } 866 867 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 868 pgm = &pgio->pg_mirrors[0]; 869 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; 870 871 pgio->pg_mirror_idx = ds_idx; 872 873 if (NFS_SERVER(pgio->pg_inode)->flags & 874 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 875 pgio->pg_maxretrans = io_maxretrans; 876 return; 877 out_nolseg: 878 if (pgio->pg_error < 0) 879 return; 880 out_mds: 881 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode, 882 0, NFS4_MAX_UINT64, IOMODE_READ, 883 NFS_I(pgio->pg_inode)->layout, 884 pgio->pg_lseg); 885 pgio->pg_maxretrans = 0; 886 nfs_pageio_reset_read_mds(pgio); 887 } 888 889 static void 890 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 891 struct nfs_page *req) 892 { 893 struct nfs4_ff_layout_mirror *mirror; 894 struct nfs_pgio_mirror *pgm; 895 struct nfs4_pnfs_ds *ds; 896 u32 i; 897 898 retry: 899 ff_layout_pg_check_layout(pgio, req); 900 if (!pgio->pg_lseg) { 901 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 902 nfs_req_openctx(req), 903 req_offset(req), 904 req->wb_bytes, 905 IOMODE_RW, 906 false, 907 GFP_NOFS); 908 if (IS_ERR(pgio->pg_lseg)) { 909 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 910 pgio->pg_lseg = NULL; 911 return; 912 } 913 } 914 /* If no lseg, fall back to write through mds */ 915 if (pgio->pg_lseg == NULL) 916 goto out_mds; 917 918 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 919 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)) 920 goto out_eagain; 921 922 for (i = 0; i < pgio->pg_mirror_count; i++) { 923 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 924 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true); 925 if (!ds) { 926 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 927 goto out_mds; 928 pnfs_generic_pg_cleanup(pgio); 929 /* Sleep for 1 second before retrying */ 930 ssleep(1); 931 goto retry; 932 } 933 pgm = &pgio->pg_mirrors[i]; 934 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize; 935 } 936 937 if (NFS_SERVER(pgio->pg_inode)->flags & 938 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 939 pgio->pg_maxretrans = io_maxretrans; 940 return; 941 out_eagain: 942 pnfs_generic_pg_cleanup(pgio); 943 pgio->pg_error = -EAGAIN; 944 return; 945 out_mds: 946 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode, 947 0, NFS4_MAX_UINT64, IOMODE_RW, 948 NFS_I(pgio->pg_inode)->layout, 949 pgio->pg_lseg); 950 pgio->pg_maxretrans = 0; 951 nfs_pageio_reset_write_mds(pgio); 952 pgio->pg_error = -EAGAIN; 953 } 954 955 static unsigned int 956 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 957 struct nfs_page *req) 958 { 959 if (!pgio->pg_lseg) { 960 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 961 nfs_req_openctx(req), 962 req_offset(req), 963 req->wb_bytes, 964 IOMODE_RW, 965 false, 966 GFP_NOFS); 967 if (IS_ERR(pgio->pg_lseg)) { 968 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 969 pgio->pg_lseg = NULL; 970 goto out; 971 } 972 } 973 if (pgio->pg_lseg) 974 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 975 976 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode, 977 0, NFS4_MAX_UINT64, IOMODE_RW, 978 NFS_I(pgio->pg_inode)->layout, 979 pgio->pg_lseg); 980 /* no lseg means that pnfs is not in use, so no mirroring here */ 981 nfs_pageio_reset_write_mds(pgio); 982 out: 983 return 1; 984 } 985 986 static u32 987 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 988 { 989 u32 old = desc->pg_mirror_idx; 990 991 desc->pg_mirror_idx = idx; 992 return old; 993 } 994 995 static struct nfs_pgio_mirror * 996 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 997 { 998 return &desc->pg_mirrors[idx]; 999 } 1000 1001 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 1002 .pg_init = ff_layout_pg_init_read, 1003 .pg_test = pnfs_generic_pg_test, 1004 .pg_doio = pnfs_generic_pg_readpages, 1005 .pg_cleanup = pnfs_generic_pg_cleanup, 1006 }; 1007 1008 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 1009 .pg_init = ff_layout_pg_init_write, 1010 .pg_test = pnfs_generic_pg_test, 1011 .pg_doio = pnfs_generic_pg_writepages, 1012 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 1013 .pg_cleanup = pnfs_generic_pg_cleanup, 1014 .pg_get_mirror = ff_layout_pg_get_mirror_write, 1015 .pg_set_mirror = ff_layout_pg_set_mirror_write, 1016 }; 1017 1018 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 1019 { 1020 struct rpc_task *task = &hdr->task; 1021 1022 pnfs_layoutcommit_inode(hdr->inode, false); 1023 1024 if (retry_pnfs) { 1025 dprintk("%s Reset task %5u for i/o through pNFS " 1026 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1027 hdr->task.tk_pid, 1028 hdr->inode->i_sb->s_id, 1029 (unsigned long long)NFS_FILEID(hdr->inode), 1030 hdr->args.count, 1031 (unsigned long long)hdr->args.offset); 1032 1033 hdr->completion_ops->reschedule_io(hdr); 1034 return; 1035 } 1036 1037 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1038 dprintk("%s Reset task %5u for i/o through MDS " 1039 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1040 hdr->task.tk_pid, 1041 hdr->inode->i_sb->s_id, 1042 (unsigned long long)NFS_FILEID(hdr->inode), 1043 hdr->args.count, 1044 (unsigned long long)hdr->args.offset); 1045 1046 trace_pnfs_mds_fallback_write_done(hdr->inode, 1047 hdr->args.offset, hdr->args.count, 1048 IOMODE_RW, NFS_I(hdr->inode)->layout, 1049 hdr->lseg); 1050 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1051 } 1052 } 1053 1054 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr) 1055 { 1056 u32 idx = hdr->pgio_mirror_idx + 1; 1057 u32 new_idx = 0; 1058 1059 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx + 1, &new_idx)) 1060 ff_layout_send_layouterror(hdr->lseg); 1061 else 1062 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1063 pnfs_read_resend_pnfs(hdr, new_idx); 1064 } 1065 1066 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1067 { 1068 struct rpc_task *task = &hdr->task; 1069 1070 pnfs_layoutcommit_inode(hdr->inode, false); 1071 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1072 1073 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1074 dprintk("%s Reset task %5u for i/o through MDS " 1075 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1076 hdr->task.tk_pid, 1077 hdr->inode->i_sb->s_id, 1078 (unsigned long long)NFS_FILEID(hdr->inode), 1079 hdr->args.count, 1080 (unsigned long long)hdr->args.offset); 1081 1082 trace_pnfs_mds_fallback_read_done(hdr->inode, 1083 hdr->args.offset, hdr->args.count, 1084 IOMODE_READ, NFS_I(hdr->inode)->layout, 1085 hdr->lseg); 1086 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1087 } 1088 } 1089 1090 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1091 struct nfs4_state *state, 1092 struct nfs_client *clp, 1093 struct pnfs_layout_segment *lseg, 1094 u32 idx) 1095 { 1096 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1097 struct inode *inode = lo->plh_inode; 1098 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1099 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1100 1101 switch (task->tk_status) { 1102 case -NFS4ERR_BADSESSION: 1103 case -NFS4ERR_BADSLOT: 1104 case -NFS4ERR_BAD_HIGH_SLOT: 1105 case -NFS4ERR_DEADSESSION: 1106 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1107 case -NFS4ERR_SEQ_FALSE_RETRY: 1108 case -NFS4ERR_SEQ_MISORDERED: 1109 dprintk("%s ERROR %d, Reset session. Exchangeid " 1110 "flags 0x%x\n", __func__, task->tk_status, 1111 clp->cl_exchange_flags); 1112 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1113 break; 1114 case -NFS4ERR_DELAY: 1115 case -NFS4ERR_GRACE: 1116 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1117 break; 1118 case -NFS4ERR_RETRY_UNCACHED_REP: 1119 break; 1120 /* Invalidate Layout errors */ 1121 case -NFS4ERR_PNFS_NO_LAYOUT: 1122 case -ESTALE: /* mapped NFS4ERR_STALE */ 1123 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 1124 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 1125 case -NFS4ERR_FHEXPIRED: 1126 case -NFS4ERR_WRONG_TYPE: 1127 dprintk("%s Invalid layout error %d\n", __func__, 1128 task->tk_status); 1129 /* 1130 * Destroy layout so new i/o will get a new layout. 1131 * Layout will not be destroyed until all current lseg 1132 * references are put. Mark layout as invalid to resend failed 1133 * i/o and all i/o waiting on the slot table to the MDS until 1134 * layout is destroyed and a new valid layout is obtained. 1135 */ 1136 pnfs_destroy_layout(NFS_I(inode)); 1137 rpc_wake_up(&tbl->slot_tbl_waitq); 1138 goto reset; 1139 /* RPC connection errors */ 1140 case -ECONNREFUSED: 1141 case -EHOSTDOWN: 1142 case -EHOSTUNREACH: 1143 case -ENETUNREACH: 1144 case -EIO: 1145 case -ETIMEDOUT: 1146 case -EPIPE: 1147 dprintk("%s DS connection error %d\n", __func__, 1148 task->tk_status); 1149 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1150 &devid->deviceid); 1151 rpc_wake_up(&tbl->slot_tbl_waitq); 1152 fallthrough; 1153 default: 1154 if (ff_layout_avoid_mds_available_ds(lseg)) 1155 return -NFS4ERR_RESET_TO_PNFS; 1156 reset: 1157 dprintk("%s Retry through MDS. Error %d\n", __func__, 1158 task->tk_status); 1159 return -NFS4ERR_RESET_TO_MDS; 1160 } 1161 task->tk_status = 0; 1162 return -EAGAIN; 1163 } 1164 1165 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1166 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1167 struct pnfs_layout_segment *lseg, 1168 u32 idx) 1169 { 1170 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1171 1172 switch (task->tk_status) { 1173 /* File access problems. Don't mark the device as unavailable */ 1174 case -EACCES: 1175 case -ESTALE: 1176 case -EISDIR: 1177 case -EBADHANDLE: 1178 case -ELOOP: 1179 case -ENOSPC: 1180 break; 1181 case -EJUKEBOX: 1182 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1183 goto out_retry; 1184 default: 1185 dprintk("%s DS connection error %d\n", __func__, 1186 task->tk_status); 1187 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1188 &devid->deviceid); 1189 } 1190 /* FIXME: Need to prevent infinite looping here. */ 1191 return -NFS4ERR_RESET_TO_PNFS; 1192 out_retry: 1193 task->tk_status = 0; 1194 rpc_restart_call_prepare(task); 1195 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1196 return -EAGAIN; 1197 } 1198 1199 static int ff_layout_async_handle_error(struct rpc_task *task, 1200 struct nfs4_state *state, 1201 struct nfs_client *clp, 1202 struct pnfs_layout_segment *lseg, 1203 u32 idx) 1204 { 1205 int vers = clp->cl_nfs_mod->rpc_vers->number; 1206 1207 if (task->tk_status >= 0) { 1208 ff_layout_mark_ds_reachable(lseg, idx); 1209 return 0; 1210 } 1211 1212 /* Handle the case of an invalid layout segment */ 1213 if (!pnfs_is_valid_lseg(lseg)) 1214 return -NFS4ERR_RESET_TO_PNFS; 1215 1216 switch (vers) { 1217 case 3: 1218 return ff_layout_async_handle_error_v3(task, lseg, idx); 1219 case 4: 1220 return ff_layout_async_handle_error_v4(task, state, clp, 1221 lseg, idx); 1222 default: 1223 /* should never happen */ 1224 WARN_ON_ONCE(1); 1225 return 0; 1226 } 1227 } 1228 1229 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1230 u32 idx, u64 offset, u64 length, 1231 u32 *op_status, int opnum, int error) 1232 { 1233 struct nfs4_ff_layout_mirror *mirror; 1234 u32 status = *op_status; 1235 int err; 1236 1237 if (status == 0) { 1238 switch (error) { 1239 case -ETIMEDOUT: 1240 case -EPFNOSUPPORT: 1241 case -EPROTONOSUPPORT: 1242 case -EOPNOTSUPP: 1243 case -ECONNREFUSED: 1244 case -ECONNRESET: 1245 case -EHOSTDOWN: 1246 case -EHOSTUNREACH: 1247 case -ENETUNREACH: 1248 case -EADDRINUSE: 1249 case -ENOBUFS: 1250 case -EPIPE: 1251 case -EPERM: 1252 *op_status = status = NFS4ERR_NXIO; 1253 break; 1254 case -EACCES: 1255 *op_status = status = NFS4ERR_ACCESS; 1256 break; 1257 default: 1258 return; 1259 } 1260 } 1261 1262 mirror = FF_LAYOUT_COMP(lseg, idx); 1263 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1264 mirror, offset, length, status, opnum, 1265 GFP_NOIO); 1266 1267 switch (status) { 1268 case NFS4ERR_DELAY: 1269 case NFS4ERR_GRACE: 1270 break; 1271 case NFS4ERR_NXIO: 1272 ff_layout_mark_ds_unreachable(lseg, idx); 1273 /* 1274 * Don't return the layout if this is a read and we still 1275 * have layouts to try 1276 */ 1277 if (opnum == OP_READ) 1278 break; 1279 fallthrough; 1280 default: 1281 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, 1282 lseg); 1283 } 1284 1285 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1286 } 1287 1288 /* NFS_PROTO call done callback routines */ 1289 static int ff_layout_read_done_cb(struct rpc_task *task, 1290 struct nfs_pgio_header *hdr) 1291 { 1292 int err; 1293 1294 if (task->tk_status < 0) { 1295 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1296 hdr->args.offset, hdr->args.count, 1297 &hdr->res.op_status, OP_READ, 1298 task->tk_status); 1299 trace_ff_layout_read_error(hdr); 1300 } 1301 1302 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1303 hdr->ds_clp, hdr->lseg, 1304 hdr->pgio_mirror_idx); 1305 1306 trace_nfs4_pnfs_read(hdr, err); 1307 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1308 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1309 switch (err) { 1310 case -NFS4ERR_RESET_TO_PNFS: 1311 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1312 return task->tk_status; 1313 case -NFS4ERR_RESET_TO_MDS: 1314 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1315 return task->tk_status; 1316 case -EAGAIN: 1317 goto out_eagain; 1318 } 1319 1320 return 0; 1321 out_eagain: 1322 rpc_restart_call_prepare(task); 1323 return -EAGAIN; 1324 } 1325 1326 static bool 1327 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1328 { 1329 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1330 } 1331 1332 /* 1333 * We reference the rpc_cred of the first WRITE that triggers the need for 1334 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1335 * rfc5661 is not clear about which credential should be used. 1336 * 1337 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1338 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1339 * we always send layoutcommit after DS writes. 1340 */ 1341 static void 1342 ff_layout_set_layoutcommit(struct inode *inode, 1343 struct pnfs_layout_segment *lseg, 1344 loff_t end_offset) 1345 { 1346 if (!ff_layout_need_layoutcommit(lseg)) 1347 return; 1348 1349 pnfs_set_layoutcommit(inode, lseg, end_offset); 1350 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1351 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1352 } 1353 1354 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1355 struct nfs_pgio_header *hdr) 1356 { 1357 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1358 return; 1359 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1360 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1361 hdr->args.count, 1362 task->tk_start); 1363 } 1364 1365 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1366 struct nfs_pgio_header *hdr) 1367 { 1368 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1369 return; 1370 nfs4_ff_layout_stat_io_end_read(task, 1371 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1372 hdr->args.count, 1373 hdr->res.count); 1374 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1375 } 1376 1377 static int ff_layout_read_prepare_common(struct rpc_task *task, 1378 struct nfs_pgio_header *hdr) 1379 { 1380 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1381 rpc_exit(task, -EIO); 1382 return -EIO; 1383 } 1384 1385 ff_layout_read_record_layoutstats_start(task, hdr); 1386 return 0; 1387 } 1388 1389 /* 1390 * Call ops for the async read/write cases 1391 * In the case of dense layouts, the offset needs to be reset to its 1392 * original value. 1393 */ 1394 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1395 { 1396 struct nfs_pgio_header *hdr = data; 1397 1398 if (ff_layout_read_prepare_common(task, hdr)) 1399 return; 1400 1401 rpc_call_start(task); 1402 } 1403 1404 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1405 { 1406 struct nfs_pgio_header *hdr = data; 1407 1408 if (nfs4_setup_sequence(hdr->ds_clp, 1409 &hdr->args.seq_args, 1410 &hdr->res.seq_res, 1411 task)) 1412 return; 1413 1414 ff_layout_read_prepare_common(task, hdr); 1415 } 1416 1417 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1418 { 1419 struct nfs_pgio_header *hdr = data; 1420 1421 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 1422 1423 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1424 task->tk_status == 0) { 1425 nfs4_sequence_done(task, &hdr->res.seq_res); 1426 return; 1427 } 1428 1429 /* Note this may cause RPC to be resent */ 1430 hdr->mds_ops->rpc_call_done(task, hdr); 1431 } 1432 1433 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1434 { 1435 struct nfs_pgio_header *hdr = data; 1436 1437 ff_layout_read_record_layoutstats_done(task, hdr); 1438 rpc_count_iostats_metrics(task, 1439 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1440 } 1441 1442 static void ff_layout_read_release(void *data) 1443 { 1444 struct nfs_pgio_header *hdr = data; 1445 1446 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1447 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) 1448 ff_layout_resend_pnfs_read(hdr); 1449 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1450 ff_layout_reset_read(hdr); 1451 pnfs_generic_rw_release(data); 1452 } 1453 1454 1455 static int ff_layout_write_done_cb(struct rpc_task *task, 1456 struct nfs_pgio_header *hdr) 1457 { 1458 loff_t end_offs = 0; 1459 int err; 1460 1461 if (task->tk_status < 0) { 1462 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1463 hdr->args.offset, hdr->args.count, 1464 &hdr->res.op_status, OP_WRITE, 1465 task->tk_status); 1466 trace_ff_layout_write_error(hdr); 1467 } 1468 1469 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1470 hdr->ds_clp, hdr->lseg, 1471 hdr->pgio_mirror_idx); 1472 1473 trace_nfs4_pnfs_write(hdr, err); 1474 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1475 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1476 switch (err) { 1477 case -NFS4ERR_RESET_TO_PNFS: 1478 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1479 return task->tk_status; 1480 case -NFS4ERR_RESET_TO_MDS: 1481 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1482 return task->tk_status; 1483 case -EAGAIN: 1484 return -EAGAIN; 1485 } 1486 1487 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1488 hdr->res.verf->committed == NFS_DATA_SYNC) 1489 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1490 1491 /* Note: if the write is unstable, don't set end_offs until commit */ 1492 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1493 1494 /* zero out fattr since we don't care DS attr at all */ 1495 hdr->fattr.valid = 0; 1496 if (task->tk_status >= 0) 1497 nfs_writeback_update_inode(hdr); 1498 1499 return 0; 1500 } 1501 1502 static int ff_layout_commit_done_cb(struct rpc_task *task, 1503 struct nfs_commit_data *data) 1504 { 1505 int err; 1506 1507 if (task->tk_status < 0) { 1508 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index, 1509 data->args.offset, data->args.count, 1510 &data->res.op_status, OP_COMMIT, 1511 task->tk_status); 1512 trace_ff_layout_commit_error(data); 1513 } 1514 1515 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1516 data->lseg, data->ds_commit_index); 1517 1518 trace_nfs4_pnfs_commit_ds(data, err); 1519 switch (err) { 1520 case -NFS4ERR_RESET_TO_PNFS: 1521 pnfs_generic_prepare_to_resend_writes(data); 1522 return -EAGAIN; 1523 case -NFS4ERR_RESET_TO_MDS: 1524 pnfs_generic_prepare_to_resend_writes(data); 1525 return -EAGAIN; 1526 case -EAGAIN: 1527 rpc_restart_call_prepare(task); 1528 return -EAGAIN; 1529 } 1530 1531 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1532 1533 return 0; 1534 } 1535 1536 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1537 struct nfs_pgio_header *hdr) 1538 { 1539 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1540 return; 1541 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1542 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1543 hdr->args.count, 1544 task->tk_start); 1545 } 1546 1547 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1548 struct nfs_pgio_header *hdr) 1549 { 1550 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1551 return; 1552 nfs4_ff_layout_stat_io_end_write(task, 1553 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1554 hdr->args.count, hdr->res.count, 1555 hdr->res.verf->committed); 1556 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1557 } 1558 1559 static int ff_layout_write_prepare_common(struct rpc_task *task, 1560 struct nfs_pgio_header *hdr) 1561 { 1562 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1563 rpc_exit(task, -EIO); 1564 return -EIO; 1565 } 1566 1567 ff_layout_write_record_layoutstats_start(task, hdr); 1568 return 0; 1569 } 1570 1571 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1572 { 1573 struct nfs_pgio_header *hdr = data; 1574 1575 if (ff_layout_write_prepare_common(task, hdr)) 1576 return; 1577 1578 rpc_call_start(task); 1579 } 1580 1581 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1582 { 1583 struct nfs_pgio_header *hdr = data; 1584 1585 if (nfs4_setup_sequence(hdr->ds_clp, 1586 &hdr->args.seq_args, 1587 &hdr->res.seq_res, 1588 task)) 1589 return; 1590 1591 ff_layout_write_prepare_common(task, hdr); 1592 } 1593 1594 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1595 { 1596 struct nfs_pgio_header *hdr = data; 1597 1598 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1599 task->tk_status == 0) { 1600 nfs4_sequence_done(task, &hdr->res.seq_res); 1601 return; 1602 } 1603 1604 /* Note this may cause RPC to be resent */ 1605 hdr->mds_ops->rpc_call_done(task, hdr); 1606 } 1607 1608 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1609 { 1610 struct nfs_pgio_header *hdr = data; 1611 1612 ff_layout_write_record_layoutstats_done(task, hdr); 1613 rpc_count_iostats_metrics(task, 1614 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1615 } 1616 1617 static void ff_layout_write_release(void *data) 1618 { 1619 struct nfs_pgio_header *hdr = data; 1620 1621 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1622 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1623 ff_layout_send_layouterror(hdr->lseg); 1624 ff_layout_reset_write(hdr, true); 1625 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1626 ff_layout_reset_write(hdr, false); 1627 pnfs_generic_rw_release(data); 1628 } 1629 1630 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1631 struct nfs_commit_data *cdata) 1632 { 1633 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1634 return; 1635 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1636 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1637 0, task->tk_start); 1638 } 1639 1640 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1641 struct nfs_commit_data *cdata) 1642 { 1643 struct nfs_page *req; 1644 __u64 count = 0; 1645 1646 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1647 return; 1648 1649 if (task->tk_status == 0) { 1650 list_for_each_entry(req, &cdata->pages, wb_list) 1651 count += req->wb_bytes; 1652 } 1653 nfs4_ff_layout_stat_io_end_write(task, 1654 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1655 count, count, NFS_FILE_SYNC); 1656 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 1657 } 1658 1659 static void ff_layout_commit_prepare_common(struct rpc_task *task, 1660 struct nfs_commit_data *cdata) 1661 { 1662 ff_layout_commit_record_layoutstats_start(task, cdata); 1663 } 1664 1665 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1666 { 1667 ff_layout_commit_prepare_common(task, data); 1668 rpc_call_start(task); 1669 } 1670 1671 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1672 { 1673 struct nfs_commit_data *wdata = data; 1674 1675 if (nfs4_setup_sequence(wdata->ds_clp, 1676 &wdata->args.seq_args, 1677 &wdata->res.seq_res, 1678 task)) 1679 return; 1680 ff_layout_commit_prepare_common(task, data); 1681 } 1682 1683 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1684 { 1685 pnfs_generic_write_commit_done(task, data); 1686 } 1687 1688 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1689 { 1690 struct nfs_commit_data *cdata = data; 1691 1692 ff_layout_commit_record_layoutstats_done(task, cdata); 1693 rpc_count_iostats_metrics(task, 1694 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1695 } 1696 1697 static void ff_layout_commit_release(void *data) 1698 { 1699 struct nfs_commit_data *cdata = data; 1700 1701 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1702 pnfs_generic_commit_release(data); 1703 } 1704 1705 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1706 .rpc_call_prepare = ff_layout_read_prepare_v3, 1707 .rpc_call_done = ff_layout_read_call_done, 1708 .rpc_count_stats = ff_layout_read_count_stats, 1709 .rpc_release = ff_layout_read_release, 1710 }; 1711 1712 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 1713 .rpc_call_prepare = ff_layout_read_prepare_v4, 1714 .rpc_call_done = ff_layout_read_call_done, 1715 .rpc_count_stats = ff_layout_read_count_stats, 1716 .rpc_release = ff_layout_read_release, 1717 }; 1718 1719 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1720 .rpc_call_prepare = ff_layout_write_prepare_v3, 1721 .rpc_call_done = ff_layout_write_call_done, 1722 .rpc_count_stats = ff_layout_write_count_stats, 1723 .rpc_release = ff_layout_write_release, 1724 }; 1725 1726 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1727 .rpc_call_prepare = ff_layout_write_prepare_v4, 1728 .rpc_call_done = ff_layout_write_call_done, 1729 .rpc_count_stats = ff_layout_write_count_stats, 1730 .rpc_release = ff_layout_write_release, 1731 }; 1732 1733 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 1734 .rpc_call_prepare = ff_layout_commit_prepare_v3, 1735 .rpc_call_done = ff_layout_commit_done, 1736 .rpc_count_stats = ff_layout_commit_count_stats, 1737 .rpc_release = ff_layout_commit_release, 1738 }; 1739 1740 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 1741 .rpc_call_prepare = ff_layout_commit_prepare_v4, 1742 .rpc_call_done = ff_layout_commit_done, 1743 .rpc_count_stats = ff_layout_commit_count_stats, 1744 .rpc_release = ff_layout_commit_release, 1745 }; 1746 1747 static enum pnfs_try_status 1748 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 1749 { 1750 struct pnfs_layout_segment *lseg = hdr->lseg; 1751 struct nfs4_pnfs_ds *ds; 1752 struct rpc_clnt *ds_clnt; 1753 struct nfs4_ff_layout_mirror *mirror; 1754 const struct cred *ds_cred; 1755 loff_t offset = hdr->args.offset; 1756 u32 idx = hdr->pgio_mirror_idx; 1757 int vers; 1758 struct nfs_fh *fh; 1759 1760 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 1761 __func__, hdr->inode->i_ino, 1762 hdr->args.pgbase, (size_t)hdr->args.count, offset); 1763 1764 mirror = FF_LAYOUT_COMP(lseg, idx); 1765 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 1766 if (!ds) 1767 goto out_failed; 1768 1769 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1770 hdr->inode); 1771 if (IS_ERR(ds_clnt)) 1772 goto out_failed; 1773 1774 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1775 if (!ds_cred) 1776 goto out_failed; 1777 1778 vers = nfs4_ff_layout_ds_version(mirror); 1779 1780 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 1781 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 1782 1783 hdr->pgio_done_cb = ff_layout_read_done_cb; 1784 refcount_inc(&ds->ds_clp->cl_count); 1785 hdr->ds_clp = ds->ds_clp; 1786 fh = nfs4_ff_layout_select_ds_fh(mirror); 1787 if (fh) 1788 hdr->args.fh = fh; 1789 1790 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1791 1792 /* 1793 * Note that if we ever decide to split across DSes, 1794 * then we may need to handle dense-like offsets. 1795 */ 1796 hdr->args.offset = offset; 1797 hdr->mds_offset = offset; 1798 1799 /* Perform an asynchronous read to ds */ 1800 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1801 vers == 3 ? &ff_layout_read_call_ops_v3 : 1802 &ff_layout_read_call_ops_v4, 1803 0, RPC_TASK_SOFTCONN); 1804 put_cred(ds_cred); 1805 return PNFS_ATTEMPTED; 1806 1807 out_failed: 1808 if (ff_layout_avoid_mds_available_ds(lseg)) 1809 return PNFS_TRY_AGAIN; 1810 trace_pnfs_mds_fallback_read_pagelist(hdr->inode, 1811 hdr->args.offset, hdr->args.count, 1812 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg); 1813 return PNFS_NOT_ATTEMPTED; 1814 } 1815 1816 /* Perform async writes. */ 1817 static enum pnfs_try_status 1818 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 1819 { 1820 struct pnfs_layout_segment *lseg = hdr->lseg; 1821 struct nfs4_pnfs_ds *ds; 1822 struct rpc_clnt *ds_clnt; 1823 struct nfs4_ff_layout_mirror *mirror; 1824 const struct cred *ds_cred; 1825 loff_t offset = hdr->args.offset; 1826 int vers; 1827 struct nfs_fh *fh; 1828 u32 idx = hdr->pgio_mirror_idx; 1829 1830 mirror = FF_LAYOUT_COMP(lseg, idx); 1831 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1832 if (!ds) 1833 goto out_failed; 1834 1835 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1836 hdr->inode); 1837 if (IS_ERR(ds_clnt)) 1838 goto out_failed; 1839 1840 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1841 if (!ds_cred) 1842 goto out_failed; 1843 1844 vers = nfs4_ff_layout_ds_version(mirror); 1845 1846 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 1847 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 1848 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 1849 vers); 1850 1851 hdr->pgio_done_cb = ff_layout_write_done_cb; 1852 refcount_inc(&ds->ds_clp->cl_count); 1853 hdr->ds_clp = ds->ds_clp; 1854 hdr->ds_commit_idx = idx; 1855 fh = nfs4_ff_layout_select_ds_fh(mirror); 1856 if (fh) 1857 hdr->args.fh = fh; 1858 1859 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1860 1861 /* 1862 * Note that if we ever decide to split across DSes, 1863 * then we may need to handle dense-like offsets. 1864 */ 1865 hdr->args.offset = offset; 1866 1867 /* Perform an asynchronous write */ 1868 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1869 vers == 3 ? &ff_layout_write_call_ops_v3 : 1870 &ff_layout_write_call_ops_v4, 1871 sync, RPC_TASK_SOFTCONN); 1872 put_cred(ds_cred); 1873 return PNFS_ATTEMPTED; 1874 1875 out_failed: 1876 if (ff_layout_avoid_mds_available_ds(lseg)) 1877 return PNFS_TRY_AGAIN; 1878 trace_pnfs_mds_fallback_write_pagelist(hdr->inode, 1879 hdr->args.offset, hdr->args.count, 1880 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg); 1881 return PNFS_NOT_ATTEMPTED; 1882 } 1883 1884 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1885 { 1886 return i; 1887 } 1888 1889 static struct nfs_fh * 1890 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1891 { 1892 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1893 1894 /* FIXME: Assume that there is only one NFS version available 1895 * for the DS. 1896 */ 1897 return &flseg->mirror_array[i]->fh_versions[0]; 1898 } 1899 1900 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 1901 { 1902 struct pnfs_layout_segment *lseg = data->lseg; 1903 struct nfs4_pnfs_ds *ds; 1904 struct rpc_clnt *ds_clnt; 1905 struct nfs4_ff_layout_mirror *mirror; 1906 const struct cred *ds_cred; 1907 u32 idx; 1908 int vers, ret; 1909 struct nfs_fh *fh; 1910 1911 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 1912 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 1913 goto out_err; 1914 1915 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1916 mirror = FF_LAYOUT_COMP(lseg, idx); 1917 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1918 if (!ds) 1919 goto out_err; 1920 1921 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1922 data->inode); 1923 if (IS_ERR(ds_clnt)) 1924 goto out_err; 1925 1926 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred); 1927 if (!ds_cred) 1928 goto out_err; 1929 1930 vers = nfs4_ff_layout_ds_version(mirror); 1931 1932 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 1933 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 1934 vers); 1935 data->commit_done_cb = ff_layout_commit_done_cb; 1936 data->cred = ds_cred; 1937 refcount_inc(&ds->ds_clp->cl_count); 1938 data->ds_clp = ds->ds_clp; 1939 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1940 if (fh) 1941 data->args.fh = fh; 1942 1943 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 1944 vers == 3 ? &ff_layout_commit_call_ops_v3 : 1945 &ff_layout_commit_call_ops_v4, 1946 how, RPC_TASK_SOFTCONN); 1947 put_cred(ds_cred); 1948 return ret; 1949 out_err: 1950 pnfs_generic_prepare_to_resend_writes(data); 1951 pnfs_generic_commit_release(data); 1952 return -EAGAIN; 1953 } 1954 1955 static int 1956 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1957 int how, struct nfs_commit_info *cinfo) 1958 { 1959 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1960 ff_layout_initiate_commit); 1961 } 1962 1963 static struct pnfs_ds_commit_info * 1964 ff_layout_get_ds_info(struct inode *inode) 1965 { 1966 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1967 1968 if (layout == NULL) 1969 return NULL; 1970 1971 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 1972 } 1973 1974 static void 1975 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 1976 struct pnfs_layout_segment *lseg) 1977 { 1978 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1979 struct inode *inode = lseg->pls_layout->plh_inode; 1980 struct pnfs_commit_array *array, *new; 1981 1982 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt, GFP_NOIO); 1983 if (new) { 1984 spin_lock(&inode->i_lock); 1985 array = pnfs_add_commit_array(fl_cinfo, new, lseg); 1986 spin_unlock(&inode->i_lock); 1987 if (array != new) 1988 pnfs_free_commit_array(new); 1989 } 1990 } 1991 1992 static void 1993 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 1994 struct inode *inode) 1995 { 1996 spin_lock(&inode->i_lock); 1997 pnfs_generic_ds_cinfo_destroy(fl_cinfo); 1998 spin_unlock(&inode->i_lock); 1999 } 2000 2001 static void 2002 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 2003 { 2004 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 2005 id_node)); 2006 } 2007 2008 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 2009 const struct nfs4_layoutreturn_args *args, 2010 const struct nfs4_flexfile_layoutreturn_args *ff_args) 2011 { 2012 __be32 *start; 2013 2014 start = xdr_reserve_space(xdr, 4); 2015 if (unlikely(!start)) 2016 return -E2BIG; 2017 2018 *start = cpu_to_be32(ff_args->num_errors); 2019 /* This assume we always return _ALL_ layouts */ 2020 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 2021 } 2022 2023 static void 2024 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len) 2025 { 2026 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0); 2027 } 2028 2029 static void 2030 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 2031 const nfs4_stateid *stateid, 2032 const struct nfs42_layoutstat_devinfo *devinfo) 2033 { 2034 __be32 *p; 2035 2036 p = xdr_reserve_space(xdr, 8 + 8); 2037 p = xdr_encode_hyper(p, devinfo->offset); 2038 p = xdr_encode_hyper(p, devinfo->length); 2039 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 2040 p = xdr_reserve_space(xdr, 4*8); 2041 p = xdr_encode_hyper(p, devinfo->read_count); 2042 p = xdr_encode_hyper(p, devinfo->read_bytes); 2043 p = xdr_encode_hyper(p, devinfo->write_count); 2044 p = xdr_encode_hyper(p, devinfo->write_bytes); 2045 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 2046 } 2047 2048 static void 2049 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 2050 const nfs4_stateid *stateid, 2051 const struct nfs42_layoutstat_devinfo *devinfo) 2052 { 2053 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 2054 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 2055 devinfo->ld_private.data); 2056 } 2057 2058 /* report nothing for now */ 2059 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 2060 const struct nfs4_layoutreturn_args *args, 2061 struct nfs4_flexfile_layoutreturn_args *ff_args) 2062 { 2063 __be32 *p; 2064 int i; 2065 2066 p = xdr_reserve_space(xdr, 4); 2067 *p = cpu_to_be32(ff_args->num_dev); 2068 for (i = 0; i < ff_args->num_dev; i++) 2069 ff_layout_encode_ff_iostat(xdr, 2070 &args->layout->plh_stateid, 2071 &ff_args->devinfo[i]); 2072 } 2073 2074 static void 2075 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 2076 unsigned int num_entries) 2077 { 2078 unsigned int i; 2079 2080 for (i = 0; i < num_entries; i++) { 2081 if (!devinfo[i].ld_private.ops) 2082 continue; 2083 if (!devinfo[i].ld_private.ops->free) 2084 continue; 2085 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 2086 } 2087 } 2088 2089 static struct nfs4_deviceid_node * 2090 ff_layout_alloc_deviceid_node(struct nfs_server *server, 2091 struct pnfs_device *pdev, gfp_t gfp_flags) 2092 { 2093 struct nfs4_ff_layout_ds *dsaddr; 2094 2095 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2096 if (!dsaddr) 2097 return NULL; 2098 return &dsaddr->id_node; 2099 } 2100 2101 static void 2102 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2103 const void *voidargs, 2104 const struct nfs4_xdr_opaque_data *ff_opaque) 2105 { 2106 const struct nfs4_layoutreturn_args *args = voidargs; 2107 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2108 struct xdr_buf tmp_buf = { 2109 .head = { 2110 [0] = { 2111 .iov_base = page_address(ff_args->pages[0]), 2112 }, 2113 }, 2114 .buflen = PAGE_SIZE, 2115 }; 2116 struct xdr_stream tmp_xdr; 2117 __be32 *start; 2118 2119 dprintk("%s: Begin\n", __func__); 2120 2121 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL); 2122 2123 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2124 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2125 2126 start = xdr_reserve_space(xdr, 4); 2127 *start = cpu_to_be32(tmp_buf.len); 2128 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2129 2130 dprintk("%s: Return\n", __func__); 2131 } 2132 2133 static void 2134 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2135 { 2136 struct nfs4_flexfile_layoutreturn_args *ff_args; 2137 2138 if (!args->data) 2139 return; 2140 ff_args = args->data; 2141 args->data = NULL; 2142 2143 ff_layout_free_ds_ioerr(&ff_args->errors); 2144 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2145 2146 put_page(ff_args->pages[0]); 2147 kfree(ff_args); 2148 } 2149 2150 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2151 .encode = ff_layout_encode_layoutreturn, 2152 .free = ff_layout_free_layoutreturn, 2153 }; 2154 2155 static int 2156 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2157 { 2158 struct nfs4_flexfile_layoutreturn_args *ff_args; 2159 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2160 2161 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL); 2162 if (!ff_args) 2163 goto out_nomem; 2164 ff_args->pages[0] = alloc_page(GFP_KERNEL); 2165 if (!ff_args->pages[0]) 2166 goto out_nomem_free; 2167 2168 INIT_LIST_HEAD(&ff_args->errors); 2169 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2170 &args->range, &ff_args->errors, 2171 FF_LAYOUTRETURN_MAXERR); 2172 2173 spin_lock(&args->inode->i_lock); 2174 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2175 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo)); 2176 spin_unlock(&args->inode->i_lock); 2177 2178 args->ld_private->ops = &layoutreturn_ops; 2179 args->ld_private->data = ff_args; 2180 return 0; 2181 out_nomem_free: 2182 kfree(ff_args); 2183 out_nomem: 2184 return -ENOMEM; 2185 } 2186 2187 #ifdef CONFIG_NFS_V4_2 2188 void 2189 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2190 { 2191 struct pnfs_layout_hdr *lo = lseg->pls_layout; 2192 struct nfs42_layout_error *errors; 2193 LIST_HEAD(head); 2194 2195 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) 2196 return; 2197 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); 2198 if (list_empty(&head)) 2199 return; 2200 2201 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, 2202 sizeof(*errors), GFP_NOFS); 2203 if (errors != NULL) { 2204 const struct nfs4_ff_layout_ds_err *pos; 2205 size_t n = 0; 2206 2207 list_for_each_entry(pos, &head, list) { 2208 errors[n].offset = pos->offset; 2209 errors[n].length = pos->length; 2210 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); 2211 errors[n].errors[0].dev_id = pos->deviceid; 2212 errors[n].errors[0].status = pos->status; 2213 errors[n].errors[0].opnum = pos->opnum; 2214 n++; 2215 if (!list_is_last(&pos->list, &head) && 2216 n < NFS42_LAYOUTERROR_MAX) 2217 continue; 2218 if (nfs42_proc_layouterror(lseg, errors, n) < 0) 2219 break; 2220 n = 0; 2221 } 2222 kfree(errors); 2223 } 2224 ff_layout_free_ds_ioerr(&head); 2225 } 2226 #else 2227 void 2228 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2229 { 2230 } 2231 #endif 2232 2233 static int 2234 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2235 { 2236 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2237 2238 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2239 } 2240 2241 static size_t 2242 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2243 const int buflen) 2244 { 2245 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2246 const struct in6_addr *addr = &sin6->sin6_addr; 2247 2248 /* 2249 * RFC 4291, Section 2.2.2 2250 * 2251 * Shorthanded ANY address 2252 */ 2253 if (ipv6_addr_any(addr)) 2254 return snprintf(buf, buflen, "::"); 2255 2256 /* 2257 * RFC 4291, Section 2.2.2 2258 * 2259 * Shorthanded loopback address 2260 */ 2261 if (ipv6_addr_loopback(addr)) 2262 return snprintf(buf, buflen, "::1"); 2263 2264 /* 2265 * RFC 4291, Section 2.2.3 2266 * 2267 * Special presentation address format for mapped v4 2268 * addresses. 2269 */ 2270 if (ipv6_addr_v4mapped(addr)) 2271 return snprintf(buf, buflen, "::ffff:%pI4", 2272 &addr->s6_addr32[3]); 2273 2274 /* 2275 * RFC 4291, Section 2.2.1 2276 */ 2277 return snprintf(buf, buflen, "%pI6c", addr); 2278 } 2279 2280 /* Derived from rpc_sockaddr2uaddr */ 2281 static void 2282 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2283 { 2284 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2285 char portbuf[RPCBIND_MAXUADDRPLEN]; 2286 char addrbuf[RPCBIND_MAXUADDRLEN]; 2287 char *netid; 2288 unsigned short port; 2289 int len, netid_len; 2290 __be32 *p; 2291 2292 switch (sap->sa_family) { 2293 case AF_INET: 2294 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2295 return; 2296 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2297 netid = "tcp"; 2298 netid_len = 3; 2299 break; 2300 case AF_INET6: 2301 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2302 return; 2303 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2304 netid = "tcp6"; 2305 netid_len = 4; 2306 break; 2307 default: 2308 /* we only support tcp and tcp6 */ 2309 WARN_ON_ONCE(1); 2310 return; 2311 } 2312 2313 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2314 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2315 2316 p = xdr_reserve_space(xdr, 4 + netid_len); 2317 xdr_encode_opaque(p, netid, netid_len); 2318 2319 p = xdr_reserve_space(xdr, 4 + len); 2320 xdr_encode_opaque(p, addrbuf, len); 2321 } 2322 2323 static void 2324 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2325 ktime_t t) 2326 { 2327 struct timespec64 ts; 2328 __be32 *p; 2329 2330 p = xdr_reserve_space(xdr, 12); 2331 ts = ktime_to_timespec64(t); 2332 p = xdr_encode_hyper(p, ts.tv_sec); 2333 *p++ = cpu_to_be32(ts.tv_nsec); 2334 } 2335 2336 static void 2337 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2338 struct nfs4_ff_io_stat *stat) 2339 { 2340 __be32 *p; 2341 2342 p = xdr_reserve_space(xdr, 5 * 8); 2343 p = xdr_encode_hyper(p, stat->ops_requested); 2344 p = xdr_encode_hyper(p, stat->bytes_requested); 2345 p = xdr_encode_hyper(p, stat->ops_completed); 2346 p = xdr_encode_hyper(p, stat->bytes_completed); 2347 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2348 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2349 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2350 } 2351 2352 static void 2353 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2354 const struct nfs42_layoutstat_devinfo *devinfo, 2355 struct nfs4_ff_layout_mirror *mirror) 2356 { 2357 struct nfs4_pnfs_ds_addr *da; 2358 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds; 2359 struct nfs_fh *fh = &mirror->fh_versions[0]; 2360 __be32 *p; 2361 2362 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2363 dprintk("%s: DS %s: encoding address %s\n", 2364 __func__, ds->ds_remotestr, da->da_remotestr); 2365 /* netaddr4 */ 2366 ff_layout_encode_netaddr(xdr, da); 2367 /* nfs_fh4 */ 2368 p = xdr_reserve_space(xdr, 4 + fh->size); 2369 xdr_encode_opaque(p, fh->data, fh->size); 2370 /* ff_io_latency4 read */ 2371 spin_lock(&mirror->lock); 2372 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat); 2373 /* ff_io_latency4 write */ 2374 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat); 2375 spin_unlock(&mirror->lock); 2376 /* nfstime4 */ 2377 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time)); 2378 /* bool */ 2379 p = xdr_reserve_space(xdr, 4); 2380 *p = cpu_to_be32(false); 2381 } 2382 2383 static void 2384 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2385 const struct nfs4_xdr_opaque_data *opaque) 2386 { 2387 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2388 struct nfs42_layoutstat_devinfo, ld_private); 2389 __be32 *start; 2390 2391 /* layoutupdate length */ 2392 start = xdr_reserve_space(xdr, 4); 2393 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2394 2395 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2396 } 2397 2398 static void 2399 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2400 { 2401 struct nfs4_ff_layout_mirror *mirror = opaque->data; 2402 2403 ff_layout_put_mirror(mirror); 2404 } 2405 2406 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2407 .encode = ff_layout_encode_layoutstats, 2408 .free = ff_layout_free_layoutstats, 2409 }; 2410 2411 static int 2412 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2413 struct nfs42_layoutstat_devinfo *devinfo, 2414 int dev_limit) 2415 { 2416 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2417 struct nfs4_ff_layout_mirror *mirror; 2418 struct nfs4_deviceid_node *dev; 2419 int i = 0; 2420 2421 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2422 if (i >= dev_limit) 2423 break; 2424 if (IS_ERR_OR_NULL(mirror->mirror_ds)) 2425 continue; 2426 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags)) 2427 continue; 2428 /* mirror refcount put in cleanup_layoutstats */ 2429 if (!refcount_inc_not_zero(&mirror->ref)) 2430 continue; 2431 dev = &mirror->mirror_ds->id_node; 2432 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE); 2433 devinfo->offset = 0; 2434 devinfo->length = NFS4_MAX_UINT64; 2435 spin_lock(&mirror->lock); 2436 devinfo->read_count = mirror->read_stat.io_stat.ops_completed; 2437 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed; 2438 devinfo->write_count = mirror->write_stat.io_stat.ops_completed; 2439 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed; 2440 spin_unlock(&mirror->lock); 2441 devinfo->layout_type = LAYOUT_FLEX_FILES; 2442 devinfo->ld_private.ops = &layoutstat_ops; 2443 devinfo->ld_private.data = mirror; 2444 2445 devinfo++; 2446 i++; 2447 } 2448 return i; 2449 } 2450 2451 static int 2452 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2453 { 2454 struct nfs4_flexfile_layout *ff_layout; 2455 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2456 2457 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2458 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO); 2459 if (!args->devinfo) 2460 return -ENOMEM; 2461 2462 spin_lock(&args->inode->i_lock); 2463 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout); 2464 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2465 &args->devinfo[0], dev_count); 2466 spin_unlock(&args->inode->i_lock); 2467 if (!args->num_dev) { 2468 kfree(args->devinfo); 2469 args->devinfo = NULL; 2470 return -ENOENT; 2471 } 2472 2473 return 0; 2474 } 2475 2476 static int 2477 ff_layout_set_layoutdriver(struct nfs_server *server, 2478 const struct nfs_fh *dummy) 2479 { 2480 #if IS_ENABLED(CONFIG_NFS_V4_2) 2481 server->caps |= NFS_CAP_LAYOUTSTATS; 2482 #endif 2483 return 0; 2484 } 2485 2486 static const struct pnfs_commit_ops ff_layout_commit_ops = { 2487 .setup_ds_info = ff_layout_setup_ds_info, 2488 .release_ds_info = ff_layout_release_ds_info, 2489 .mark_request_commit = pnfs_layout_mark_request_commit, 2490 .clear_request_commit = pnfs_generic_clear_request_commit, 2491 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2492 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2493 .commit_pagelist = ff_layout_commit_pagelist, 2494 }; 2495 2496 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2497 .id = LAYOUT_FLEX_FILES, 2498 .name = "LAYOUT_FLEX_FILES", 2499 .owner = THIS_MODULE, 2500 .flags = PNFS_LAYOUTGET_ON_OPEN, 2501 .max_layoutget_response = 4096, /* 1 page or so... */ 2502 .set_layoutdriver = ff_layout_set_layoutdriver, 2503 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2504 .free_layout_hdr = ff_layout_free_layout_hdr, 2505 .alloc_lseg = ff_layout_alloc_lseg, 2506 .free_lseg = ff_layout_free_lseg, 2507 .add_lseg = ff_layout_add_lseg, 2508 .pg_read_ops = &ff_layout_pg_read_ops, 2509 .pg_write_ops = &ff_layout_pg_write_ops, 2510 .get_ds_info = ff_layout_get_ds_info, 2511 .free_deviceid_node = ff_layout_free_deviceid_node, 2512 .read_pagelist = ff_layout_read_pagelist, 2513 .write_pagelist = ff_layout_write_pagelist, 2514 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 2515 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 2516 .sync = pnfs_nfs_generic_sync, 2517 .prepare_layoutstats = ff_layout_prepare_layoutstats, 2518 }; 2519 2520 static int __init nfs4flexfilelayout_init(void) 2521 { 2522 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 2523 __func__); 2524 return pnfs_register_layoutdriver(&flexfilelayout_type); 2525 } 2526 2527 static void __exit nfs4flexfilelayout_exit(void) 2528 { 2529 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 2530 __func__); 2531 pnfs_unregister_layoutdriver(&flexfilelayout_type); 2532 } 2533 2534 MODULE_ALIAS("nfs-layouttype4-4"); 2535 2536 MODULE_LICENSE("GPL"); 2537 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 2538 2539 module_init(nfs4flexfilelayout_init); 2540 module_exit(nfs4flexfilelayout_exit); 2541 2542 module_param(io_maxretrans, ushort, 0644); 2543 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client " 2544 "retries an I/O request before returning an error. "); 2545