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