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