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