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 > NFS_MAXFHSIZE) { 110 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n", 111 fh->size); 112 return -EOVERFLOW; 113 } 114 /* fh.data */ 115 p = xdr_inline_decode(xdr, fh->size); 116 if (unlikely(!p)) 117 return -ENOBUFS; 118 memcpy(&fh->data, p, fh->size); 119 dprintk("%s: fh len %d\n", __func__, fh->size); 120 121 return 0; 122 } 123 124 /* 125 * Currently only stringified uids and gids are accepted. 126 * I.e., kerberos is not supported to the DSes, so no pricipals. 127 * 128 * That means that one common function will suffice, but when 129 * principals are added, this should be split to accomodate 130 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid(). 131 */ 132 static int 133 decode_name(struct xdr_stream *xdr, u32 *id) 134 { 135 __be32 *p; 136 int len; 137 138 /* opaque_length(4)*/ 139 p = xdr_inline_decode(xdr, 4); 140 if (unlikely(!p)) 141 return -ENOBUFS; 142 len = be32_to_cpup(p++); 143 if (len < 0) 144 return -EINVAL; 145 146 dprintk("%s: len %u\n", __func__, len); 147 148 /* opaque body */ 149 p = xdr_inline_decode(xdr, len); 150 if (unlikely(!p)) 151 return -ENOBUFS; 152 153 if (!nfs_map_string_to_numeric((char *)p, len, id)) 154 return -EINVAL; 155 156 return 0; 157 } 158 159 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1, 160 const struct nfs4_ff_layout_mirror *m2) 161 { 162 int i, j; 163 164 if (m1->fh_versions_cnt != m2->fh_versions_cnt) 165 return false; 166 for (i = 0; i < m1->fh_versions_cnt; i++) { 167 bool found_fh = false; 168 for (j = 0; j < m2->fh_versions_cnt; j++) { 169 if (nfs_compare_fh(&m1->fh_versions[i], 170 &m2->fh_versions[j]) == 0) { 171 found_fh = true; 172 break; 173 } 174 } 175 if (!found_fh) 176 return false; 177 } 178 return true; 179 } 180 181 static struct nfs4_ff_layout_mirror * 182 ff_layout_add_mirror(struct pnfs_layout_hdr *lo, 183 struct nfs4_ff_layout_mirror *mirror) 184 { 185 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 186 struct nfs4_ff_layout_mirror *pos; 187 struct inode *inode = lo->plh_inode; 188 189 spin_lock(&inode->i_lock); 190 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) { 191 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0) 192 continue; 193 if (!ff_mirror_match_fh(mirror, pos)) 194 continue; 195 if (refcount_inc_not_zero(&pos->ref)) { 196 spin_unlock(&inode->i_lock); 197 return pos; 198 } 199 } 200 list_add(&mirror->mirrors, &ff_layout->mirrors); 201 mirror->layout = lo; 202 spin_unlock(&inode->i_lock); 203 return mirror; 204 } 205 206 static void 207 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror) 208 { 209 struct inode *inode; 210 if (mirror->layout == NULL) 211 return; 212 inode = mirror->layout->plh_inode; 213 spin_lock(&inode->i_lock); 214 list_del(&mirror->mirrors); 215 spin_unlock(&inode->i_lock); 216 mirror->layout = NULL; 217 } 218 219 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags) 220 { 221 struct nfs4_ff_layout_mirror *mirror; 222 223 mirror = kzalloc(sizeof(*mirror), gfp_flags); 224 if (mirror != NULL) { 225 spin_lock_init(&mirror->lock); 226 refcount_set(&mirror->ref, 1); 227 INIT_LIST_HEAD(&mirror->mirrors); 228 } 229 return mirror; 230 } 231 232 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror) 233 { 234 const struct cred *cred; 235 236 ff_layout_remove_mirror(mirror); 237 kfree(mirror->fh_versions); 238 cred = rcu_access_pointer(mirror->ro_cred); 239 put_cred(cred); 240 cred = rcu_access_pointer(mirror->rw_cred); 241 put_cred(cred); 242 nfs4_ff_layout_put_deviceid(mirror->mirror_ds); 243 kfree(mirror); 244 } 245 246 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror) 247 { 248 if (mirror != NULL && refcount_dec_and_test(&mirror->ref)) 249 ff_layout_free_mirror(mirror); 250 } 251 252 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls) 253 { 254 u32 i; 255 256 for (i = 0; i < fls->mirror_array_cnt; i++) 257 ff_layout_put_mirror(fls->mirror_array[i]); 258 } 259 260 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls) 261 { 262 if (fls) { 263 ff_layout_free_mirror_array(fls); 264 kfree(fls); 265 } 266 } 267 268 static bool 269 ff_lseg_match_mirrors(struct pnfs_layout_segment *l1, 270 struct pnfs_layout_segment *l2) 271 { 272 const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1); 273 const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1); 274 u32 i; 275 276 if (fl1->mirror_array_cnt != fl2->mirror_array_cnt) 277 return false; 278 for (i = 0; i < fl1->mirror_array_cnt; i++) { 279 if (fl1->mirror_array[i] != fl2->mirror_array[i]) 280 return false; 281 } 282 return true; 283 } 284 285 static bool 286 ff_lseg_range_is_after(const struct pnfs_layout_range *l1, 287 const struct pnfs_layout_range *l2) 288 { 289 u64 end1, end2; 290 291 if (l1->iomode != l2->iomode) 292 return l1->iomode != IOMODE_READ; 293 end1 = pnfs_calc_offset_end(l1->offset, l1->length); 294 end2 = pnfs_calc_offset_end(l2->offset, l2->length); 295 if (end1 < l2->offset) 296 return false; 297 if (end2 < l1->offset) 298 return true; 299 return l2->offset <= l1->offset; 300 } 301 302 static bool 303 ff_lseg_merge(struct pnfs_layout_segment *new, 304 struct pnfs_layout_segment *old) 305 { 306 u64 new_end, old_end; 307 308 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags)) 309 return false; 310 if (new->pls_range.iomode != old->pls_range.iomode) 311 return false; 312 old_end = pnfs_calc_offset_end(old->pls_range.offset, 313 old->pls_range.length); 314 if (old_end < new->pls_range.offset) 315 return false; 316 new_end = pnfs_calc_offset_end(new->pls_range.offset, 317 new->pls_range.length); 318 if (new_end < old->pls_range.offset) 319 return false; 320 if (!ff_lseg_match_mirrors(new, old)) 321 return false; 322 323 /* Mergeable: copy info from 'old' to 'new' */ 324 if (new_end < old_end) 325 new_end = old_end; 326 if (new->pls_range.offset < old->pls_range.offset) 327 new->pls_range.offset = old->pls_range.offset; 328 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset, 329 new_end); 330 if (test_bit(NFS_LSEG_ROC, &old->pls_flags)) 331 set_bit(NFS_LSEG_ROC, &new->pls_flags); 332 return true; 333 } 334 335 static void 336 ff_layout_add_lseg(struct pnfs_layout_hdr *lo, 337 struct pnfs_layout_segment *lseg, 338 struct list_head *free_me) 339 { 340 pnfs_generic_layout_insert_lseg(lo, lseg, 341 ff_lseg_range_is_after, 342 ff_lseg_merge, 343 free_me); 344 } 345 346 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls) 347 { 348 int i, j; 349 350 for (i = 0; i < fls->mirror_array_cnt - 1; i++) { 351 for (j = i + 1; j < fls->mirror_array_cnt; j++) 352 if (fls->mirror_array[i]->efficiency < 353 fls->mirror_array[j]->efficiency) 354 swap(fls->mirror_array[i], 355 fls->mirror_array[j]); 356 } 357 } 358 359 static struct pnfs_layout_segment * 360 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh, 361 struct nfs4_layoutget_res *lgr, 362 gfp_t gfp_flags) 363 { 364 struct pnfs_layout_segment *ret; 365 struct nfs4_ff_layout_segment *fls = NULL; 366 struct xdr_stream stream; 367 struct xdr_buf buf; 368 struct page *scratch; 369 u64 stripe_unit; 370 u32 mirror_array_cnt; 371 __be32 *p; 372 int i, rc; 373 374 dprintk("--> %s\n", __func__); 375 scratch = alloc_page(gfp_flags); 376 if (!scratch) 377 return ERR_PTR(-ENOMEM); 378 379 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, 380 lgr->layoutp->len); 381 xdr_set_scratch_page(&stream, scratch); 382 383 /* stripe unit and mirror_array_cnt */ 384 rc = -EIO; 385 p = xdr_inline_decode(&stream, 8 + 4); 386 if (!p) 387 goto out_err_free; 388 389 p = xdr_decode_hyper(p, &stripe_unit); 390 mirror_array_cnt = be32_to_cpup(p++); 391 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__, 392 stripe_unit, mirror_array_cnt); 393 394 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT || 395 mirror_array_cnt == 0) 396 goto out_err_free; 397 398 rc = -ENOMEM; 399 fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt), 400 gfp_flags); 401 if (!fls) 402 goto out_err_free; 403 404 fls->mirror_array_cnt = mirror_array_cnt; 405 fls->stripe_unit = stripe_unit; 406 407 for (i = 0; i < fls->mirror_array_cnt; i++) { 408 struct nfs4_ff_layout_mirror *mirror; 409 struct cred *kcred; 410 const struct cred __rcu *cred; 411 kuid_t uid; 412 kgid_t gid; 413 u32 ds_count, fh_count, id; 414 int j; 415 416 rc = -EIO; 417 p = xdr_inline_decode(&stream, 4); 418 if (!p) 419 goto out_err_free; 420 ds_count = be32_to_cpup(p); 421 422 /* FIXME: allow for striping? */ 423 if (ds_count != 1) 424 goto out_err_free; 425 426 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags); 427 if (fls->mirror_array[i] == NULL) { 428 rc = -ENOMEM; 429 goto out_err_free; 430 } 431 432 fls->mirror_array[i]->ds_count = ds_count; 433 434 /* deviceid */ 435 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid); 436 if (rc) 437 goto out_err_free; 438 439 /* efficiency */ 440 rc = -EIO; 441 p = xdr_inline_decode(&stream, 4); 442 if (!p) 443 goto out_err_free; 444 fls->mirror_array[i]->efficiency = be32_to_cpup(p); 445 446 /* stateid */ 447 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid); 448 if (rc) 449 goto out_err_free; 450 451 /* fh */ 452 rc = -EIO; 453 p = xdr_inline_decode(&stream, 4); 454 if (!p) 455 goto out_err_free; 456 fh_count = be32_to_cpup(p); 457 458 fls->mirror_array[i]->fh_versions = 459 kcalloc(fh_count, sizeof(struct nfs_fh), 460 gfp_flags); 461 if (fls->mirror_array[i]->fh_versions == NULL) { 462 rc = -ENOMEM; 463 goto out_err_free; 464 } 465 466 for (j = 0; j < fh_count; j++) { 467 rc = decode_nfs_fh(&stream, 468 &fls->mirror_array[i]->fh_versions[j]); 469 if (rc) 470 goto out_err_free; 471 } 472 473 fls->mirror_array[i]->fh_versions_cnt = fh_count; 474 475 /* user */ 476 rc = decode_name(&stream, &id); 477 if (rc) 478 goto out_err_free; 479 480 uid = make_kuid(&init_user_ns, id); 481 482 /* group */ 483 rc = decode_name(&stream, &id); 484 if (rc) 485 goto out_err_free; 486 487 gid = make_kgid(&init_user_ns, id); 488 489 if (gfp_flags & __GFP_FS) 490 kcred = prepare_kernel_cred(NULL); 491 else { 492 unsigned int nofs_flags = memalloc_nofs_save(); 493 kcred = prepare_kernel_cred(NULL); 494 memalloc_nofs_restore(nofs_flags); 495 } 496 rc = -ENOMEM; 497 if (!kcred) 498 goto out_err_free; 499 kcred->fsuid = uid; 500 kcred->fsgid = gid; 501 cred = RCU_INITIALIZER(kcred); 502 503 if (lgr->range.iomode == IOMODE_READ) 504 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 505 else 506 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 507 508 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]); 509 if (mirror != fls->mirror_array[i]) { 510 /* swap cred ptrs so free_mirror will clean up old */ 511 if (lgr->range.iomode == IOMODE_READ) { 512 cred = xchg(&mirror->ro_cred, cred); 513 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 514 } else { 515 cred = xchg(&mirror->rw_cred, cred); 516 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 517 } 518 ff_layout_free_mirror(fls->mirror_array[i]); 519 fls->mirror_array[i] = mirror; 520 } 521 522 dprintk("%s: iomode %s uid %u gid %u\n", __func__, 523 lgr->range.iomode == IOMODE_READ ? "READ" : "RW", 524 from_kuid(&init_user_ns, uid), 525 from_kgid(&init_user_ns, gid)); 526 } 527 528 p = xdr_inline_decode(&stream, 4); 529 if (!p) 530 goto out_sort_mirrors; 531 fls->flags = be32_to_cpup(p); 532 533 p = xdr_inline_decode(&stream, 4); 534 if (!p) 535 goto out_sort_mirrors; 536 for (i=0; i < fls->mirror_array_cnt; i++) 537 fls->mirror_array[i]->report_interval = be32_to_cpup(p); 538 539 out_sort_mirrors: 540 ff_layout_sort_mirrors(fls); 541 ret = &fls->generic_hdr; 542 dprintk("<-- %s (success)\n", __func__); 543 out_free_page: 544 __free_page(scratch); 545 return ret; 546 out_err_free: 547 _ff_layout_free_lseg(fls); 548 ret = ERR_PTR(rc); 549 dprintk("<-- %s (%d)\n", __func__, rc); 550 goto out_free_page; 551 } 552 553 static void 554 ff_layout_free_lseg(struct pnfs_layout_segment *lseg) 555 { 556 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 557 558 dprintk("--> %s\n", __func__); 559 560 if (lseg->pls_range.iomode == IOMODE_RW) { 561 struct nfs4_flexfile_layout *ffl; 562 struct inode *inode; 563 564 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout); 565 inode = ffl->generic_hdr.plh_inode; 566 spin_lock(&inode->i_lock); 567 pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg); 568 spin_unlock(&inode->i_lock); 569 } 570 _ff_layout_free_lseg(fls); 571 } 572 573 static void 574 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 575 { 576 /* first IO request? */ 577 if (atomic_inc_return(&timer->n_ops) == 1) { 578 timer->start_time = now; 579 } 580 } 581 582 static ktime_t 583 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 584 { 585 ktime_t start; 586 587 if (atomic_dec_return(&timer->n_ops) < 0) 588 WARN_ON_ONCE(1); 589 590 start = timer->start_time; 591 timer->start_time = now; 592 return ktime_sub(now, start); 593 } 594 595 static bool 596 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 597 struct nfs4_ff_layoutstat *layoutstat, 598 ktime_t now) 599 { 600 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL; 601 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout); 602 603 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now); 604 if (!mirror->start_time) 605 mirror->start_time = now; 606 if (mirror->report_interval != 0) 607 report_interval = (s64)mirror->report_interval * 1000LL; 608 else if (layoutstats_timer != 0) 609 report_interval = (s64)layoutstats_timer * 1000LL; 610 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >= 611 report_interval) { 612 ffl->last_report_time = now; 613 return true; 614 } 615 616 return false; 617 } 618 619 static void 620 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat, 621 __u64 requested) 622 { 623 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 624 625 iostat->ops_requested++; 626 iostat->bytes_requested += requested; 627 } 628 629 static void 630 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat, 631 __u64 requested, 632 __u64 completed, 633 ktime_t time_completed, 634 ktime_t time_started) 635 { 636 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 637 ktime_t completion_time = ktime_sub(time_completed, time_started); 638 ktime_t timer; 639 640 iostat->ops_completed++; 641 iostat->bytes_completed += completed; 642 iostat->bytes_not_delivered += requested - completed; 643 644 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed); 645 iostat->total_busy_time = 646 ktime_add(iostat->total_busy_time, timer); 647 iostat->aggregate_completion_time = 648 ktime_add(iostat->aggregate_completion_time, 649 completion_time); 650 } 651 652 static void 653 nfs4_ff_layout_stat_io_start_read(struct inode *inode, 654 struct nfs4_ff_layout_mirror *mirror, 655 __u64 requested, ktime_t now) 656 { 657 bool report; 658 659 spin_lock(&mirror->lock); 660 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now); 661 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested); 662 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 663 spin_unlock(&mirror->lock); 664 665 if (report) 666 pnfs_report_layoutstat(inode, nfs_io_gfp_mask()); 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, nfs_io_gfp_mask()); 698 } 699 700 static void 701 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, 702 struct nfs4_ff_layout_mirror *mirror, 703 __u64 requested, 704 __u64 completed, 705 enum nfs3_stable_how committed) 706 { 707 if (committed == NFS_UNSTABLE) 708 requested = completed = 0; 709 710 spin_lock(&mirror->lock); 711 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat, 712 requested, completed, ktime_get(), task->tk_start); 713 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 714 spin_unlock(&mirror->lock); 715 } 716 717 static void 718 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx) 719 { 720 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 721 722 if (devid) 723 nfs4_mark_deviceid_unavailable(devid); 724 } 725 726 static void 727 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx) 728 { 729 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 730 731 if (devid) 732 nfs4_mark_deviceid_available(devid); 733 } 734 735 static struct nfs4_pnfs_ds * 736 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, 737 u32 start_idx, u32 *best_idx, 738 bool check_device) 739 { 740 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 741 struct nfs4_ff_layout_mirror *mirror; 742 struct nfs4_pnfs_ds *ds; 743 u32 idx; 744 745 /* mirrors are initially sorted by efficiency */ 746 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 747 mirror = FF_LAYOUT_COMP(lseg, idx); 748 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 749 if (!ds) 750 continue; 751 752 if (check_device && 753 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node)) 754 continue; 755 756 *best_idx = idx; 757 return ds; 758 } 759 760 return NULL; 761 } 762 763 static struct nfs4_pnfs_ds * 764 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg, 765 u32 start_idx, u32 *best_idx) 766 { 767 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false); 768 } 769 770 static struct nfs4_pnfs_ds * 771 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg, 772 u32 start_idx, u32 *best_idx) 773 { 774 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true); 775 } 776 777 static struct nfs4_pnfs_ds * 778 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 779 u32 start_idx, u32 *best_idx) 780 { 781 struct nfs4_pnfs_ds *ds; 782 783 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx); 784 if (ds) 785 return ds; 786 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx); 787 } 788 789 static struct nfs4_pnfs_ds * 790 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio, 791 u32 *best_idx) 792 { 793 struct pnfs_layout_segment *lseg = pgio->pg_lseg; 794 struct nfs4_pnfs_ds *ds; 795 796 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx, 797 best_idx); 798 if (ds || !pgio->pg_mirror_idx) 799 return ds; 800 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx); 801 } 802 803 static void 804 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio, 805 struct nfs_page *req, 806 bool strict_iomode) 807 { 808 pnfs_put_lseg(pgio->pg_lseg); 809 pgio->pg_lseg = 810 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 811 req_offset(req), req->wb_bytes, IOMODE_READ, 812 strict_iomode, nfs_io_gfp_mask()); 813 if (IS_ERR(pgio->pg_lseg)) { 814 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 815 pgio->pg_lseg = NULL; 816 } 817 } 818 819 static void 820 ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio, 821 struct nfs_page *req) 822 { 823 pnfs_generic_pg_check_layout(pgio); 824 pnfs_generic_pg_check_range(pgio, req); 825 } 826 827 static void 828 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 829 struct nfs_page *req) 830 { 831 struct nfs_pgio_mirror *pgm; 832 struct nfs4_ff_layout_mirror *mirror; 833 struct nfs4_pnfs_ds *ds; 834 u32 ds_idx; 835 836 retry: 837 ff_layout_pg_check_layout(pgio, req); 838 /* Use full layout for now */ 839 if (!pgio->pg_lseg) { 840 ff_layout_pg_get_read(pgio, req, false); 841 if (!pgio->pg_lseg) 842 goto out_nolseg; 843 } 844 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 845 ff_layout_pg_get_read(pgio, req, true); 846 if (!pgio->pg_lseg) 847 goto out_nolseg; 848 } 849 850 ds = ff_layout_get_ds_for_read(pgio, &ds_idx); 851 if (!ds) { 852 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 853 goto out_mds; 854 pnfs_generic_pg_cleanup(pgio); 855 /* Sleep for 1 second before retrying */ 856 ssleep(1); 857 goto retry; 858 } 859 860 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 861 pgm = &pgio->pg_mirrors[0]; 862 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; 863 864 pgio->pg_mirror_idx = ds_idx; 865 866 if (NFS_SERVER(pgio->pg_inode)->flags & 867 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 868 pgio->pg_maxretrans = io_maxretrans; 869 return; 870 out_nolseg: 871 if (pgio->pg_error < 0) 872 return; 873 out_mds: 874 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode, 875 0, NFS4_MAX_UINT64, IOMODE_READ, 876 NFS_I(pgio->pg_inode)->layout, 877 pgio->pg_lseg); 878 pgio->pg_maxretrans = 0; 879 nfs_pageio_reset_read_mds(pgio); 880 } 881 882 static void 883 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 884 struct nfs_page *req) 885 { 886 struct nfs4_ff_layout_mirror *mirror; 887 struct nfs_pgio_mirror *pgm; 888 struct nfs4_pnfs_ds *ds; 889 u32 i; 890 891 retry: 892 ff_layout_pg_check_layout(pgio, req); 893 if (!pgio->pg_lseg) { 894 pgio->pg_lseg = 895 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 896 req_offset(req), req->wb_bytes, 897 IOMODE_RW, false, nfs_io_gfp_mask()); 898 if (IS_ERR(pgio->pg_lseg)) { 899 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 900 pgio->pg_lseg = NULL; 901 return; 902 } 903 } 904 /* If no lseg, fall back to write through mds */ 905 if (pgio->pg_lseg == NULL) 906 goto out_mds; 907 908 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 909 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)) 910 goto out_eagain; 911 912 for (i = 0; i < pgio->pg_mirror_count; i++) { 913 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 914 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true); 915 if (!ds) { 916 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 917 goto out_mds; 918 pnfs_generic_pg_cleanup(pgio); 919 /* Sleep for 1 second before retrying */ 920 ssleep(1); 921 goto retry; 922 } 923 pgm = &pgio->pg_mirrors[i]; 924 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize; 925 } 926 927 if (NFS_SERVER(pgio->pg_inode)->flags & 928 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 929 pgio->pg_maxretrans = io_maxretrans; 930 return; 931 out_eagain: 932 pnfs_generic_pg_cleanup(pgio); 933 pgio->pg_error = -EAGAIN; 934 return; 935 out_mds: 936 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode, 937 0, NFS4_MAX_UINT64, IOMODE_RW, 938 NFS_I(pgio->pg_inode)->layout, 939 pgio->pg_lseg); 940 pgio->pg_maxretrans = 0; 941 nfs_pageio_reset_write_mds(pgio); 942 pgio->pg_error = -EAGAIN; 943 } 944 945 static unsigned int 946 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 947 struct nfs_page *req) 948 { 949 if (!pgio->pg_lseg) { 950 pgio->pg_lseg = 951 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 952 req_offset(req), req->wb_bytes, 953 IOMODE_RW, false, nfs_io_gfp_mask()); 954 if (IS_ERR(pgio->pg_lseg)) { 955 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 956 pgio->pg_lseg = NULL; 957 goto out; 958 } 959 } 960 if (pgio->pg_lseg) 961 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 962 963 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode, 964 0, NFS4_MAX_UINT64, IOMODE_RW, 965 NFS_I(pgio->pg_inode)->layout, 966 pgio->pg_lseg); 967 /* no lseg means that pnfs is not in use, so no mirroring here */ 968 nfs_pageio_reset_write_mds(pgio); 969 out: 970 return 1; 971 } 972 973 static u32 974 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 975 { 976 u32 old = desc->pg_mirror_idx; 977 978 desc->pg_mirror_idx = idx; 979 return old; 980 } 981 982 static struct nfs_pgio_mirror * 983 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 984 { 985 return &desc->pg_mirrors[idx]; 986 } 987 988 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 989 .pg_init = ff_layout_pg_init_read, 990 .pg_test = pnfs_generic_pg_test, 991 .pg_doio = pnfs_generic_pg_readpages, 992 .pg_cleanup = pnfs_generic_pg_cleanup, 993 }; 994 995 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 996 .pg_init = ff_layout_pg_init_write, 997 .pg_test = pnfs_generic_pg_test, 998 .pg_doio = pnfs_generic_pg_writepages, 999 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 1000 .pg_cleanup = pnfs_generic_pg_cleanup, 1001 .pg_get_mirror = ff_layout_pg_get_mirror_write, 1002 .pg_set_mirror = ff_layout_pg_set_mirror_write, 1003 }; 1004 1005 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 1006 { 1007 struct rpc_task *task = &hdr->task; 1008 1009 pnfs_layoutcommit_inode(hdr->inode, false); 1010 1011 if (retry_pnfs) { 1012 dprintk("%s Reset task %5u for i/o through pNFS " 1013 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1014 hdr->task.tk_pid, 1015 hdr->inode->i_sb->s_id, 1016 (unsigned long long)NFS_FILEID(hdr->inode), 1017 hdr->args.count, 1018 (unsigned long long)hdr->args.offset); 1019 1020 hdr->completion_ops->reschedule_io(hdr); 1021 return; 1022 } 1023 1024 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1025 dprintk("%s Reset task %5u for i/o through MDS " 1026 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1027 hdr->task.tk_pid, 1028 hdr->inode->i_sb->s_id, 1029 (unsigned long long)NFS_FILEID(hdr->inode), 1030 hdr->args.count, 1031 (unsigned long long)hdr->args.offset); 1032 1033 trace_pnfs_mds_fallback_write_done(hdr->inode, 1034 hdr->args.offset, hdr->args.count, 1035 IOMODE_RW, NFS_I(hdr->inode)->layout, 1036 hdr->lseg); 1037 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1038 } 1039 } 1040 1041 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr) 1042 { 1043 u32 idx = hdr->pgio_mirror_idx + 1; 1044 u32 new_idx = 0; 1045 1046 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx)) 1047 ff_layout_send_layouterror(hdr->lseg); 1048 else 1049 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1050 pnfs_read_resend_pnfs(hdr, new_idx); 1051 } 1052 1053 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1054 { 1055 struct rpc_task *task = &hdr->task; 1056 1057 pnfs_layoutcommit_inode(hdr->inode, false); 1058 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1059 1060 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1061 dprintk("%s Reset task %5u for i/o through MDS " 1062 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1063 hdr->task.tk_pid, 1064 hdr->inode->i_sb->s_id, 1065 (unsigned long long)NFS_FILEID(hdr->inode), 1066 hdr->args.count, 1067 (unsigned long long)hdr->args.offset); 1068 1069 trace_pnfs_mds_fallback_read_done(hdr->inode, 1070 hdr->args.offset, hdr->args.count, 1071 IOMODE_READ, NFS_I(hdr->inode)->layout, 1072 hdr->lseg); 1073 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1074 } 1075 } 1076 1077 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1078 struct nfs4_state *state, 1079 struct nfs_client *clp, 1080 struct pnfs_layout_segment *lseg, 1081 u32 idx) 1082 { 1083 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1084 struct inode *inode = lo->plh_inode; 1085 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1086 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1087 1088 switch (task->tk_status) { 1089 case -NFS4ERR_BADSESSION: 1090 case -NFS4ERR_BADSLOT: 1091 case -NFS4ERR_BAD_HIGH_SLOT: 1092 case -NFS4ERR_DEADSESSION: 1093 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1094 case -NFS4ERR_SEQ_FALSE_RETRY: 1095 case -NFS4ERR_SEQ_MISORDERED: 1096 dprintk("%s ERROR %d, Reset session. Exchangeid " 1097 "flags 0x%x\n", __func__, task->tk_status, 1098 clp->cl_exchange_flags); 1099 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1100 break; 1101 case -NFS4ERR_DELAY: 1102 case -NFS4ERR_GRACE: 1103 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1104 break; 1105 case -NFS4ERR_RETRY_UNCACHED_REP: 1106 break; 1107 /* Invalidate Layout errors */ 1108 case -NFS4ERR_PNFS_NO_LAYOUT: 1109 case -ESTALE: /* mapped NFS4ERR_STALE */ 1110 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 1111 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 1112 case -NFS4ERR_FHEXPIRED: 1113 case -NFS4ERR_WRONG_TYPE: 1114 dprintk("%s Invalid layout error %d\n", __func__, 1115 task->tk_status); 1116 /* 1117 * Destroy layout so new i/o will get a new layout. 1118 * Layout will not be destroyed until all current lseg 1119 * references are put. Mark layout as invalid to resend failed 1120 * i/o and all i/o waiting on the slot table to the MDS until 1121 * layout is destroyed and a new valid layout is obtained. 1122 */ 1123 pnfs_destroy_layout(NFS_I(inode)); 1124 rpc_wake_up(&tbl->slot_tbl_waitq); 1125 goto reset; 1126 /* RPC connection errors */ 1127 case -ECONNREFUSED: 1128 case -EHOSTDOWN: 1129 case -EHOSTUNREACH: 1130 case -ENETUNREACH: 1131 case -EIO: 1132 case -ETIMEDOUT: 1133 case -EPIPE: 1134 case -EPROTO: 1135 case -ENODEV: 1136 dprintk("%s DS connection error %d\n", __func__, 1137 task->tk_status); 1138 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1139 &devid->deviceid); 1140 rpc_wake_up(&tbl->slot_tbl_waitq); 1141 fallthrough; 1142 default: 1143 if (ff_layout_avoid_mds_available_ds(lseg)) 1144 return -NFS4ERR_RESET_TO_PNFS; 1145 reset: 1146 dprintk("%s Retry through MDS. Error %d\n", __func__, 1147 task->tk_status); 1148 return -NFS4ERR_RESET_TO_MDS; 1149 } 1150 task->tk_status = 0; 1151 return -EAGAIN; 1152 } 1153 1154 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1155 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1156 struct pnfs_layout_segment *lseg, 1157 u32 idx) 1158 { 1159 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1160 1161 switch (task->tk_status) { 1162 /* File access problems. Don't mark the device as unavailable */ 1163 case -EACCES: 1164 case -ESTALE: 1165 case -EISDIR: 1166 case -EBADHANDLE: 1167 case -ELOOP: 1168 case -ENOSPC: 1169 break; 1170 case -EJUKEBOX: 1171 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1172 goto out_retry; 1173 default: 1174 dprintk("%s DS connection error %d\n", __func__, 1175 task->tk_status); 1176 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1177 &devid->deviceid); 1178 } 1179 /* FIXME: Need to prevent infinite looping here. */ 1180 return -NFS4ERR_RESET_TO_PNFS; 1181 out_retry: 1182 task->tk_status = 0; 1183 rpc_restart_call_prepare(task); 1184 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1185 return -EAGAIN; 1186 } 1187 1188 static int ff_layout_async_handle_error(struct rpc_task *task, 1189 struct nfs4_state *state, 1190 struct nfs_client *clp, 1191 struct pnfs_layout_segment *lseg, 1192 u32 idx) 1193 { 1194 int vers = clp->cl_nfs_mod->rpc_vers->number; 1195 1196 if (task->tk_status >= 0) { 1197 ff_layout_mark_ds_reachable(lseg, idx); 1198 return 0; 1199 } 1200 1201 /* Handle the case of an invalid layout segment */ 1202 if (!pnfs_is_valid_lseg(lseg)) 1203 return -NFS4ERR_RESET_TO_PNFS; 1204 1205 switch (vers) { 1206 case 3: 1207 return ff_layout_async_handle_error_v3(task, lseg, idx); 1208 case 4: 1209 return ff_layout_async_handle_error_v4(task, state, clp, 1210 lseg, idx); 1211 default: 1212 /* should never happen */ 1213 WARN_ON_ONCE(1); 1214 return 0; 1215 } 1216 } 1217 1218 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1219 u32 idx, u64 offset, u64 length, 1220 u32 *op_status, int opnum, int error) 1221 { 1222 struct nfs4_ff_layout_mirror *mirror; 1223 u32 status = *op_status; 1224 int err; 1225 1226 if (status == 0) { 1227 switch (error) { 1228 case -ETIMEDOUT: 1229 case -EPFNOSUPPORT: 1230 case -EPROTONOSUPPORT: 1231 case -EOPNOTSUPP: 1232 case -ECONNREFUSED: 1233 case -ECONNRESET: 1234 case -EHOSTDOWN: 1235 case -EHOSTUNREACH: 1236 case -ENETUNREACH: 1237 case -EADDRINUSE: 1238 case -ENOBUFS: 1239 case -EPIPE: 1240 case -EPERM: 1241 case -EPROTO: 1242 case -ENODEV: 1243 *op_status = status = NFS4ERR_NXIO; 1244 break; 1245 case -EACCES: 1246 *op_status = status = NFS4ERR_ACCESS; 1247 break; 1248 default: 1249 return; 1250 } 1251 } 1252 1253 mirror = FF_LAYOUT_COMP(lseg, idx); 1254 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1255 mirror, offset, length, status, opnum, 1256 nfs_io_gfp_mask()); 1257 1258 switch (status) { 1259 case NFS4ERR_DELAY: 1260 case NFS4ERR_GRACE: 1261 break; 1262 case NFS4ERR_NXIO: 1263 ff_layout_mark_ds_unreachable(lseg, idx); 1264 /* 1265 * Don't return the layout if this is a read and we still 1266 * have layouts to try 1267 */ 1268 if (opnum == OP_READ) 1269 break; 1270 fallthrough; 1271 default: 1272 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, 1273 lseg); 1274 } 1275 1276 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1277 } 1278 1279 /* NFS_PROTO call done callback routines */ 1280 static int ff_layout_read_done_cb(struct rpc_task *task, 1281 struct nfs_pgio_header *hdr) 1282 { 1283 int err; 1284 1285 if (task->tk_status < 0) { 1286 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1287 hdr->args.offset, hdr->args.count, 1288 &hdr->res.op_status, OP_READ, 1289 task->tk_status); 1290 trace_ff_layout_read_error(hdr); 1291 } 1292 1293 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1294 hdr->ds_clp, hdr->lseg, 1295 hdr->pgio_mirror_idx); 1296 1297 trace_nfs4_pnfs_read(hdr, err); 1298 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1299 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1300 switch (err) { 1301 case -NFS4ERR_RESET_TO_PNFS: 1302 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1303 return task->tk_status; 1304 case -NFS4ERR_RESET_TO_MDS: 1305 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1306 return task->tk_status; 1307 case -EAGAIN: 1308 goto out_eagain; 1309 } 1310 1311 return 0; 1312 out_eagain: 1313 rpc_restart_call_prepare(task); 1314 return -EAGAIN; 1315 } 1316 1317 static bool 1318 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1319 { 1320 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1321 } 1322 1323 /* 1324 * We reference the rpc_cred of the first WRITE that triggers the need for 1325 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1326 * rfc5661 is not clear about which credential should be used. 1327 * 1328 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1329 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1330 * we always send layoutcommit after DS writes. 1331 */ 1332 static void 1333 ff_layout_set_layoutcommit(struct inode *inode, 1334 struct pnfs_layout_segment *lseg, 1335 loff_t end_offset) 1336 { 1337 if (!ff_layout_need_layoutcommit(lseg)) 1338 return; 1339 1340 pnfs_set_layoutcommit(inode, lseg, end_offset); 1341 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1342 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1343 } 1344 1345 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1346 struct nfs_pgio_header *hdr) 1347 { 1348 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1349 return; 1350 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1351 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1352 hdr->args.count, 1353 task->tk_start); 1354 } 1355 1356 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1357 struct nfs_pgio_header *hdr) 1358 { 1359 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1360 return; 1361 nfs4_ff_layout_stat_io_end_read(task, 1362 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1363 hdr->args.count, 1364 hdr->res.count); 1365 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1366 } 1367 1368 static int ff_layout_read_prepare_common(struct rpc_task *task, 1369 struct nfs_pgio_header *hdr) 1370 { 1371 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1372 rpc_exit(task, -EIO); 1373 return -EIO; 1374 } 1375 1376 ff_layout_read_record_layoutstats_start(task, hdr); 1377 return 0; 1378 } 1379 1380 /* 1381 * Call ops for the async read/write cases 1382 * In the case of dense layouts, the offset needs to be reset to its 1383 * original value. 1384 */ 1385 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1386 { 1387 struct nfs_pgio_header *hdr = data; 1388 1389 if (ff_layout_read_prepare_common(task, hdr)) 1390 return; 1391 1392 rpc_call_start(task); 1393 } 1394 1395 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1396 { 1397 struct nfs_pgio_header *hdr = data; 1398 1399 if (nfs4_setup_sequence(hdr->ds_clp, 1400 &hdr->args.seq_args, 1401 &hdr->res.seq_res, 1402 task)) 1403 return; 1404 1405 ff_layout_read_prepare_common(task, hdr); 1406 } 1407 1408 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1409 { 1410 struct nfs_pgio_header *hdr = data; 1411 1412 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1413 task->tk_status == 0) { 1414 nfs4_sequence_done(task, &hdr->res.seq_res); 1415 return; 1416 } 1417 1418 /* Note this may cause RPC to be resent */ 1419 hdr->mds_ops->rpc_call_done(task, hdr); 1420 } 1421 1422 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1423 { 1424 struct nfs_pgio_header *hdr = data; 1425 1426 ff_layout_read_record_layoutstats_done(task, hdr); 1427 rpc_count_iostats_metrics(task, 1428 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1429 } 1430 1431 static void ff_layout_read_release(void *data) 1432 { 1433 struct nfs_pgio_header *hdr = data; 1434 1435 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1436 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) 1437 ff_layout_resend_pnfs_read(hdr); 1438 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1439 ff_layout_reset_read(hdr); 1440 pnfs_generic_rw_release(data); 1441 } 1442 1443 1444 static int ff_layout_write_done_cb(struct rpc_task *task, 1445 struct nfs_pgio_header *hdr) 1446 { 1447 loff_t end_offs = 0; 1448 int err; 1449 1450 if (task->tk_status < 0) { 1451 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1452 hdr->args.offset, hdr->args.count, 1453 &hdr->res.op_status, OP_WRITE, 1454 task->tk_status); 1455 trace_ff_layout_write_error(hdr); 1456 } 1457 1458 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1459 hdr->ds_clp, hdr->lseg, 1460 hdr->pgio_mirror_idx); 1461 1462 trace_nfs4_pnfs_write(hdr, err); 1463 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1464 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1465 switch (err) { 1466 case -NFS4ERR_RESET_TO_PNFS: 1467 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1468 return task->tk_status; 1469 case -NFS4ERR_RESET_TO_MDS: 1470 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1471 return task->tk_status; 1472 case -EAGAIN: 1473 return -EAGAIN; 1474 } 1475 1476 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1477 hdr->res.verf->committed == NFS_DATA_SYNC) 1478 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1479 1480 /* Note: if the write is unstable, don't set end_offs until commit */ 1481 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1482 1483 /* zero out fattr since we don't care DS attr at all */ 1484 hdr->fattr.valid = 0; 1485 if (task->tk_status >= 0) 1486 nfs_writeback_update_inode(hdr); 1487 1488 return 0; 1489 } 1490 1491 static int ff_layout_commit_done_cb(struct rpc_task *task, 1492 struct nfs_commit_data *data) 1493 { 1494 int err; 1495 1496 if (task->tk_status < 0) { 1497 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index, 1498 data->args.offset, data->args.count, 1499 &data->res.op_status, OP_COMMIT, 1500 task->tk_status); 1501 trace_ff_layout_commit_error(data); 1502 } 1503 1504 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1505 data->lseg, data->ds_commit_index); 1506 1507 trace_nfs4_pnfs_commit_ds(data, err); 1508 switch (err) { 1509 case -NFS4ERR_RESET_TO_PNFS: 1510 pnfs_generic_prepare_to_resend_writes(data); 1511 return -EAGAIN; 1512 case -NFS4ERR_RESET_TO_MDS: 1513 pnfs_generic_prepare_to_resend_writes(data); 1514 return -EAGAIN; 1515 case -EAGAIN: 1516 rpc_restart_call_prepare(task); 1517 return -EAGAIN; 1518 } 1519 1520 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1521 1522 return 0; 1523 } 1524 1525 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1526 struct nfs_pgio_header *hdr) 1527 { 1528 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1529 return; 1530 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1531 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1532 hdr->args.count, 1533 task->tk_start); 1534 } 1535 1536 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1537 struct nfs_pgio_header *hdr) 1538 { 1539 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1540 return; 1541 nfs4_ff_layout_stat_io_end_write(task, 1542 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1543 hdr->args.count, hdr->res.count, 1544 hdr->res.verf->committed); 1545 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1546 } 1547 1548 static int ff_layout_write_prepare_common(struct rpc_task *task, 1549 struct nfs_pgio_header *hdr) 1550 { 1551 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1552 rpc_exit(task, -EIO); 1553 return -EIO; 1554 } 1555 1556 ff_layout_write_record_layoutstats_start(task, hdr); 1557 return 0; 1558 } 1559 1560 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1561 { 1562 struct nfs_pgio_header *hdr = data; 1563 1564 if (ff_layout_write_prepare_common(task, hdr)) 1565 return; 1566 1567 rpc_call_start(task); 1568 } 1569 1570 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1571 { 1572 struct nfs_pgio_header *hdr = data; 1573 1574 if (nfs4_setup_sequence(hdr->ds_clp, 1575 &hdr->args.seq_args, 1576 &hdr->res.seq_res, 1577 task)) 1578 return; 1579 1580 ff_layout_write_prepare_common(task, hdr); 1581 } 1582 1583 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1584 { 1585 struct nfs_pgio_header *hdr = data; 1586 1587 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1588 task->tk_status == 0) { 1589 nfs4_sequence_done(task, &hdr->res.seq_res); 1590 return; 1591 } 1592 1593 /* Note this may cause RPC to be resent */ 1594 hdr->mds_ops->rpc_call_done(task, hdr); 1595 } 1596 1597 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1598 { 1599 struct nfs_pgio_header *hdr = data; 1600 1601 ff_layout_write_record_layoutstats_done(task, hdr); 1602 rpc_count_iostats_metrics(task, 1603 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1604 } 1605 1606 static void ff_layout_write_release(void *data) 1607 { 1608 struct nfs_pgio_header *hdr = data; 1609 1610 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1611 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1612 ff_layout_send_layouterror(hdr->lseg); 1613 ff_layout_reset_write(hdr, true); 1614 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1615 ff_layout_reset_write(hdr, false); 1616 pnfs_generic_rw_release(data); 1617 } 1618 1619 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1620 struct nfs_commit_data *cdata) 1621 { 1622 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1623 return; 1624 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1625 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1626 0, task->tk_start); 1627 } 1628 1629 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1630 struct nfs_commit_data *cdata) 1631 { 1632 struct nfs_page *req; 1633 __u64 count = 0; 1634 1635 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1636 return; 1637 1638 if (task->tk_status == 0) { 1639 list_for_each_entry(req, &cdata->pages, wb_list) 1640 count += req->wb_bytes; 1641 } 1642 nfs4_ff_layout_stat_io_end_write(task, 1643 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1644 count, count, NFS_FILE_SYNC); 1645 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 1646 } 1647 1648 static void ff_layout_commit_prepare_common(struct rpc_task *task, 1649 struct nfs_commit_data *cdata) 1650 { 1651 ff_layout_commit_record_layoutstats_start(task, cdata); 1652 } 1653 1654 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1655 { 1656 ff_layout_commit_prepare_common(task, data); 1657 rpc_call_start(task); 1658 } 1659 1660 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1661 { 1662 struct nfs_commit_data *wdata = data; 1663 1664 if (nfs4_setup_sequence(wdata->ds_clp, 1665 &wdata->args.seq_args, 1666 &wdata->res.seq_res, 1667 task)) 1668 return; 1669 ff_layout_commit_prepare_common(task, data); 1670 } 1671 1672 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1673 { 1674 pnfs_generic_write_commit_done(task, data); 1675 } 1676 1677 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1678 { 1679 struct nfs_commit_data *cdata = data; 1680 1681 ff_layout_commit_record_layoutstats_done(task, cdata); 1682 rpc_count_iostats_metrics(task, 1683 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1684 } 1685 1686 static void ff_layout_commit_release(void *data) 1687 { 1688 struct nfs_commit_data *cdata = data; 1689 1690 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1691 pnfs_generic_commit_release(data); 1692 } 1693 1694 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1695 .rpc_call_prepare = ff_layout_read_prepare_v3, 1696 .rpc_call_done = ff_layout_read_call_done, 1697 .rpc_count_stats = ff_layout_read_count_stats, 1698 .rpc_release = ff_layout_read_release, 1699 }; 1700 1701 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 1702 .rpc_call_prepare = ff_layout_read_prepare_v4, 1703 .rpc_call_done = ff_layout_read_call_done, 1704 .rpc_count_stats = ff_layout_read_count_stats, 1705 .rpc_release = ff_layout_read_release, 1706 }; 1707 1708 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1709 .rpc_call_prepare = ff_layout_write_prepare_v3, 1710 .rpc_call_done = ff_layout_write_call_done, 1711 .rpc_count_stats = ff_layout_write_count_stats, 1712 .rpc_release = ff_layout_write_release, 1713 }; 1714 1715 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1716 .rpc_call_prepare = ff_layout_write_prepare_v4, 1717 .rpc_call_done = ff_layout_write_call_done, 1718 .rpc_count_stats = ff_layout_write_count_stats, 1719 .rpc_release = ff_layout_write_release, 1720 }; 1721 1722 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 1723 .rpc_call_prepare = ff_layout_commit_prepare_v3, 1724 .rpc_call_done = ff_layout_commit_done, 1725 .rpc_count_stats = ff_layout_commit_count_stats, 1726 .rpc_release = ff_layout_commit_release, 1727 }; 1728 1729 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 1730 .rpc_call_prepare = ff_layout_commit_prepare_v4, 1731 .rpc_call_done = ff_layout_commit_done, 1732 .rpc_count_stats = ff_layout_commit_count_stats, 1733 .rpc_release = ff_layout_commit_release, 1734 }; 1735 1736 static enum pnfs_try_status 1737 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 1738 { 1739 struct pnfs_layout_segment *lseg = hdr->lseg; 1740 struct nfs4_pnfs_ds *ds; 1741 struct rpc_clnt *ds_clnt; 1742 struct nfs4_ff_layout_mirror *mirror; 1743 const struct cred *ds_cred; 1744 loff_t offset = hdr->args.offset; 1745 u32 idx = hdr->pgio_mirror_idx; 1746 int vers; 1747 struct nfs_fh *fh; 1748 1749 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 1750 __func__, hdr->inode->i_ino, 1751 hdr->args.pgbase, (size_t)hdr->args.count, offset); 1752 1753 mirror = FF_LAYOUT_COMP(lseg, idx); 1754 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 1755 if (!ds) 1756 goto out_failed; 1757 1758 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1759 hdr->inode); 1760 if (IS_ERR(ds_clnt)) 1761 goto out_failed; 1762 1763 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1764 if (!ds_cred) 1765 goto out_failed; 1766 1767 vers = nfs4_ff_layout_ds_version(mirror); 1768 1769 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 1770 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 1771 1772 hdr->pgio_done_cb = ff_layout_read_done_cb; 1773 refcount_inc(&ds->ds_clp->cl_count); 1774 hdr->ds_clp = ds->ds_clp; 1775 fh = nfs4_ff_layout_select_ds_fh(mirror); 1776 if (fh) 1777 hdr->args.fh = fh; 1778 1779 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1780 1781 /* 1782 * Note that if we ever decide to split across DSes, 1783 * then we may need to handle dense-like offsets. 1784 */ 1785 hdr->args.offset = offset; 1786 hdr->mds_offset = offset; 1787 1788 /* Perform an asynchronous read to ds */ 1789 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1790 vers == 3 ? &ff_layout_read_call_ops_v3 : 1791 &ff_layout_read_call_ops_v4, 1792 0, RPC_TASK_SOFTCONN); 1793 put_cred(ds_cred); 1794 return PNFS_ATTEMPTED; 1795 1796 out_failed: 1797 if (ff_layout_avoid_mds_available_ds(lseg)) 1798 return PNFS_TRY_AGAIN; 1799 trace_pnfs_mds_fallback_read_pagelist(hdr->inode, 1800 hdr->args.offset, hdr->args.count, 1801 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg); 1802 return PNFS_NOT_ATTEMPTED; 1803 } 1804 1805 /* Perform async writes. */ 1806 static enum pnfs_try_status 1807 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 1808 { 1809 struct pnfs_layout_segment *lseg = hdr->lseg; 1810 struct nfs4_pnfs_ds *ds; 1811 struct rpc_clnt *ds_clnt; 1812 struct nfs4_ff_layout_mirror *mirror; 1813 const struct cred *ds_cred; 1814 loff_t offset = hdr->args.offset; 1815 int vers; 1816 struct nfs_fh *fh; 1817 u32 idx = hdr->pgio_mirror_idx; 1818 1819 mirror = FF_LAYOUT_COMP(lseg, idx); 1820 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1821 if (!ds) 1822 goto out_failed; 1823 1824 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1825 hdr->inode); 1826 if (IS_ERR(ds_clnt)) 1827 goto out_failed; 1828 1829 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1830 if (!ds_cred) 1831 goto out_failed; 1832 1833 vers = nfs4_ff_layout_ds_version(mirror); 1834 1835 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 1836 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 1837 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 1838 vers); 1839 1840 hdr->pgio_done_cb = ff_layout_write_done_cb; 1841 refcount_inc(&ds->ds_clp->cl_count); 1842 hdr->ds_clp = ds->ds_clp; 1843 hdr->ds_commit_idx = idx; 1844 fh = nfs4_ff_layout_select_ds_fh(mirror); 1845 if (fh) 1846 hdr->args.fh = fh; 1847 1848 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1849 1850 /* 1851 * Note that if we ever decide to split across DSes, 1852 * then we may need to handle dense-like offsets. 1853 */ 1854 hdr->args.offset = offset; 1855 1856 /* Perform an asynchronous write */ 1857 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1858 vers == 3 ? &ff_layout_write_call_ops_v3 : 1859 &ff_layout_write_call_ops_v4, 1860 sync, RPC_TASK_SOFTCONN); 1861 put_cred(ds_cred); 1862 return PNFS_ATTEMPTED; 1863 1864 out_failed: 1865 if (ff_layout_avoid_mds_available_ds(lseg)) 1866 return PNFS_TRY_AGAIN; 1867 trace_pnfs_mds_fallback_write_pagelist(hdr->inode, 1868 hdr->args.offset, hdr->args.count, 1869 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg); 1870 return PNFS_NOT_ATTEMPTED; 1871 } 1872 1873 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1874 { 1875 return i; 1876 } 1877 1878 static struct nfs_fh * 1879 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1880 { 1881 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1882 1883 /* FIXME: Assume that there is only one NFS version available 1884 * for the DS. 1885 */ 1886 return &flseg->mirror_array[i]->fh_versions[0]; 1887 } 1888 1889 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 1890 { 1891 struct pnfs_layout_segment *lseg = data->lseg; 1892 struct nfs4_pnfs_ds *ds; 1893 struct rpc_clnt *ds_clnt; 1894 struct nfs4_ff_layout_mirror *mirror; 1895 const struct cred *ds_cred; 1896 u32 idx; 1897 int vers, ret; 1898 struct nfs_fh *fh; 1899 1900 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 1901 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 1902 goto out_err; 1903 1904 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1905 mirror = FF_LAYOUT_COMP(lseg, idx); 1906 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1907 if (!ds) 1908 goto out_err; 1909 1910 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1911 data->inode); 1912 if (IS_ERR(ds_clnt)) 1913 goto out_err; 1914 1915 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred); 1916 if (!ds_cred) 1917 goto out_err; 1918 1919 vers = nfs4_ff_layout_ds_version(mirror); 1920 1921 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 1922 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 1923 vers); 1924 data->commit_done_cb = ff_layout_commit_done_cb; 1925 data->cred = ds_cred; 1926 refcount_inc(&ds->ds_clp->cl_count); 1927 data->ds_clp = ds->ds_clp; 1928 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1929 if (fh) 1930 data->args.fh = fh; 1931 1932 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 1933 vers == 3 ? &ff_layout_commit_call_ops_v3 : 1934 &ff_layout_commit_call_ops_v4, 1935 how, RPC_TASK_SOFTCONN); 1936 put_cred(ds_cred); 1937 return ret; 1938 out_err: 1939 pnfs_generic_prepare_to_resend_writes(data); 1940 pnfs_generic_commit_release(data); 1941 return -EAGAIN; 1942 } 1943 1944 static int 1945 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1946 int how, struct nfs_commit_info *cinfo) 1947 { 1948 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1949 ff_layout_initiate_commit); 1950 } 1951 1952 static struct pnfs_ds_commit_info * 1953 ff_layout_get_ds_info(struct inode *inode) 1954 { 1955 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1956 1957 if (layout == NULL) 1958 return NULL; 1959 1960 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 1961 } 1962 1963 static void 1964 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 1965 struct pnfs_layout_segment *lseg) 1966 { 1967 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1968 struct inode *inode = lseg->pls_layout->plh_inode; 1969 struct pnfs_commit_array *array, *new; 1970 1971 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt, 1972 nfs_io_gfp_mask()); 1973 if (new) { 1974 spin_lock(&inode->i_lock); 1975 array = pnfs_add_commit_array(fl_cinfo, new, lseg); 1976 spin_unlock(&inode->i_lock); 1977 if (array != new) 1978 pnfs_free_commit_array(new); 1979 } 1980 } 1981 1982 static void 1983 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 1984 struct inode *inode) 1985 { 1986 spin_lock(&inode->i_lock); 1987 pnfs_generic_ds_cinfo_destroy(fl_cinfo); 1988 spin_unlock(&inode->i_lock); 1989 } 1990 1991 static void 1992 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 1993 { 1994 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 1995 id_node)); 1996 } 1997 1998 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 1999 const struct nfs4_layoutreturn_args *args, 2000 const struct nfs4_flexfile_layoutreturn_args *ff_args) 2001 { 2002 __be32 *start; 2003 2004 start = xdr_reserve_space(xdr, 4); 2005 if (unlikely(!start)) 2006 return -E2BIG; 2007 2008 *start = cpu_to_be32(ff_args->num_errors); 2009 /* This assume we always return _ALL_ layouts */ 2010 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 2011 } 2012 2013 static void 2014 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len) 2015 { 2016 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0); 2017 } 2018 2019 static void 2020 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 2021 const nfs4_stateid *stateid, 2022 const struct nfs42_layoutstat_devinfo *devinfo) 2023 { 2024 __be32 *p; 2025 2026 p = xdr_reserve_space(xdr, 8 + 8); 2027 p = xdr_encode_hyper(p, devinfo->offset); 2028 p = xdr_encode_hyper(p, devinfo->length); 2029 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 2030 p = xdr_reserve_space(xdr, 4*8); 2031 p = xdr_encode_hyper(p, devinfo->read_count); 2032 p = xdr_encode_hyper(p, devinfo->read_bytes); 2033 p = xdr_encode_hyper(p, devinfo->write_count); 2034 p = xdr_encode_hyper(p, devinfo->write_bytes); 2035 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 2036 } 2037 2038 static void 2039 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 2040 const nfs4_stateid *stateid, 2041 const struct nfs42_layoutstat_devinfo *devinfo) 2042 { 2043 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 2044 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 2045 devinfo->ld_private.data); 2046 } 2047 2048 /* report nothing for now */ 2049 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 2050 const struct nfs4_layoutreturn_args *args, 2051 struct nfs4_flexfile_layoutreturn_args *ff_args) 2052 { 2053 __be32 *p; 2054 int i; 2055 2056 p = xdr_reserve_space(xdr, 4); 2057 *p = cpu_to_be32(ff_args->num_dev); 2058 for (i = 0; i < ff_args->num_dev; i++) 2059 ff_layout_encode_ff_iostat(xdr, 2060 &args->layout->plh_stateid, 2061 &ff_args->devinfo[i]); 2062 } 2063 2064 static void 2065 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 2066 unsigned int num_entries) 2067 { 2068 unsigned int i; 2069 2070 for (i = 0; i < num_entries; i++) { 2071 if (!devinfo[i].ld_private.ops) 2072 continue; 2073 if (!devinfo[i].ld_private.ops->free) 2074 continue; 2075 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 2076 } 2077 } 2078 2079 static struct nfs4_deviceid_node * 2080 ff_layout_alloc_deviceid_node(struct nfs_server *server, 2081 struct pnfs_device *pdev, gfp_t gfp_flags) 2082 { 2083 struct nfs4_ff_layout_ds *dsaddr; 2084 2085 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2086 if (!dsaddr) 2087 return NULL; 2088 return &dsaddr->id_node; 2089 } 2090 2091 static void 2092 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2093 const void *voidargs, 2094 const struct nfs4_xdr_opaque_data *ff_opaque) 2095 { 2096 const struct nfs4_layoutreturn_args *args = voidargs; 2097 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2098 struct xdr_buf tmp_buf = { 2099 .head = { 2100 [0] = { 2101 .iov_base = page_address(ff_args->pages[0]), 2102 }, 2103 }, 2104 .buflen = PAGE_SIZE, 2105 }; 2106 struct xdr_stream tmp_xdr; 2107 __be32 *start; 2108 2109 dprintk("%s: Begin\n", __func__); 2110 2111 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL); 2112 2113 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2114 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2115 2116 start = xdr_reserve_space(xdr, 4); 2117 *start = cpu_to_be32(tmp_buf.len); 2118 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2119 2120 dprintk("%s: Return\n", __func__); 2121 } 2122 2123 static void 2124 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2125 { 2126 struct nfs4_flexfile_layoutreturn_args *ff_args; 2127 2128 if (!args->data) 2129 return; 2130 ff_args = args->data; 2131 args->data = NULL; 2132 2133 ff_layout_free_ds_ioerr(&ff_args->errors); 2134 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2135 2136 put_page(ff_args->pages[0]); 2137 kfree(ff_args); 2138 } 2139 2140 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2141 .encode = ff_layout_encode_layoutreturn, 2142 .free = ff_layout_free_layoutreturn, 2143 }; 2144 2145 static int 2146 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2147 { 2148 struct nfs4_flexfile_layoutreturn_args *ff_args; 2149 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2150 2151 ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask()); 2152 if (!ff_args) 2153 goto out_nomem; 2154 ff_args->pages[0] = alloc_page(nfs_io_gfp_mask()); 2155 if (!ff_args->pages[0]) 2156 goto out_nomem_free; 2157 2158 INIT_LIST_HEAD(&ff_args->errors); 2159 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2160 &args->range, &ff_args->errors, 2161 FF_LAYOUTRETURN_MAXERR); 2162 2163 spin_lock(&args->inode->i_lock); 2164 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2165 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo)); 2166 spin_unlock(&args->inode->i_lock); 2167 2168 args->ld_private->ops = &layoutreturn_ops; 2169 args->ld_private->data = ff_args; 2170 return 0; 2171 out_nomem_free: 2172 kfree(ff_args); 2173 out_nomem: 2174 return -ENOMEM; 2175 } 2176 2177 #ifdef CONFIG_NFS_V4_2 2178 void 2179 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2180 { 2181 struct pnfs_layout_hdr *lo = lseg->pls_layout; 2182 struct nfs42_layout_error *errors; 2183 LIST_HEAD(head); 2184 2185 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) 2186 return; 2187 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); 2188 if (list_empty(&head)) 2189 return; 2190 2191 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors), 2192 nfs_io_gfp_mask()); 2193 if (errors != NULL) { 2194 const struct nfs4_ff_layout_ds_err *pos; 2195 size_t n = 0; 2196 2197 list_for_each_entry(pos, &head, list) { 2198 errors[n].offset = pos->offset; 2199 errors[n].length = pos->length; 2200 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); 2201 errors[n].errors[0].dev_id = pos->deviceid; 2202 errors[n].errors[0].status = pos->status; 2203 errors[n].errors[0].opnum = pos->opnum; 2204 n++; 2205 if (!list_is_last(&pos->list, &head) && 2206 n < NFS42_LAYOUTERROR_MAX) 2207 continue; 2208 if (nfs42_proc_layouterror(lseg, errors, n) < 0) 2209 break; 2210 n = 0; 2211 } 2212 kfree(errors); 2213 } 2214 ff_layout_free_ds_ioerr(&head); 2215 } 2216 #else 2217 void 2218 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2219 { 2220 } 2221 #endif 2222 2223 static int 2224 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2225 { 2226 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2227 2228 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2229 } 2230 2231 static size_t 2232 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2233 const int buflen) 2234 { 2235 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2236 const struct in6_addr *addr = &sin6->sin6_addr; 2237 2238 /* 2239 * RFC 4291, Section 2.2.2 2240 * 2241 * Shorthanded ANY address 2242 */ 2243 if (ipv6_addr_any(addr)) 2244 return snprintf(buf, buflen, "::"); 2245 2246 /* 2247 * RFC 4291, Section 2.2.2 2248 * 2249 * Shorthanded loopback address 2250 */ 2251 if (ipv6_addr_loopback(addr)) 2252 return snprintf(buf, buflen, "::1"); 2253 2254 /* 2255 * RFC 4291, Section 2.2.3 2256 * 2257 * Special presentation address format for mapped v4 2258 * addresses. 2259 */ 2260 if (ipv6_addr_v4mapped(addr)) 2261 return snprintf(buf, buflen, "::ffff:%pI4", 2262 &addr->s6_addr32[3]); 2263 2264 /* 2265 * RFC 4291, Section 2.2.1 2266 */ 2267 return snprintf(buf, buflen, "%pI6c", addr); 2268 } 2269 2270 /* Derived from rpc_sockaddr2uaddr */ 2271 static void 2272 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2273 { 2274 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2275 char portbuf[RPCBIND_MAXUADDRPLEN]; 2276 char addrbuf[RPCBIND_MAXUADDRLEN]; 2277 unsigned short port; 2278 int len, netid_len; 2279 __be32 *p; 2280 2281 switch (sap->sa_family) { 2282 case AF_INET: 2283 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2284 return; 2285 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2286 break; 2287 case AF_INET6: 2288 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2289 return; 2290 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2291 break; 2292 default: 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 netid_len = strlen(da->da_netid); 2301 p = xdr_reserve_space(xdr, 4 + netid_len); 2302 xdr_encode_opaque(p, da->da_netid, netid_len); 2303 2304 p = xdr_reserve_space(xdr, 4 + len); 2305 xdr_encode_opaque(p, addrbuf, len); 2306 } 2307 2308 static void 2309 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2310 ktime_t t) 2311 { 2312 struct timespec64 ts; 2313 __be32 *p; 2314 2315 p = xdr_reserve_space(xdr, 12); 2316 ts = ktime_to_timespec64(t); 2317 p = xdr_encode_hyper(p, ts.tv_sec); 2318 *p++ = cpu_to_be32(ts.tv_nsec); 2319 } 2320 2321 static void 2322 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2323 struct nfs4_ff_io_stat *stat) 2324 { 2325 __be32 *p; 2326 2327 p = xdr_reserve_space(xdr, 5 * 8); 2328 p = xdr_encode_hyper(p, stat->ops_requested); 2329 p = xdr_encode_hyper(p, stat->bytes_requested); 2330 p = xdr_encode_hyper(p, stat->ops_completed); 2331 p = xdr_encode_hyper(p, stat->bytes_completed); 2332 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2333 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2334 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2335 } 2336 2337 static void 2338 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2339 const struct nfs42_layoutstat_devinfo *devinfo, 2340 struct nfs4_ff_layout_mirror *mirror) 2341 { 2342 struct nfs4_pnfs_ds_addr *da; 2343 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds; 2344 struct nfs_fh *fh = &mirror->fh_versions[0]; 2345 __be32 *p; 2346 2347 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2348 dprintk("%s: DS %s: encoding address %s\n", 2349 __func__, ds->ds_remotestr, da->da_remotestr); 2350 /* netaddr4 */ 2351 ff_layout_encode_netaddr(xdr, da); 2352 /* nfs_fh4 */ 2353 p = xdr_reserve_space(xdr, 4 + fh->size); 2354 xdr_encode_opaque(p, fh->data, fh->size); 2355 /* ff_io_latency4 read */ 2356 spin_lock(&mirror->lock); 2357 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat); 2358 /* ff_io_latency4 write */ 2359 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat); 2360 spin_unlock(&mirror->lock); 2361 /* nfstime4 */ 2362 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time)); 2363 /* bool */ 2364 p = xdr_reserve_space(xdr, 4); 2365 *p = cpu_to_be32(false); 2366 } 2367 2368 static void 2369 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2370 const struct nfs4_xdr_opaque_data *opaque) 2371 { 2372 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2373 struct nfs42_layoutstat_devinfo, ld_private); 2374 __be32 *start; 2375 2376 /* layoutupdate length */ 2377 start = xdr_reserve_space(xdr, 4); 2378 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2379 2380 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2381 } 2382 2383 static void 2384 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2385 { 2386 struct nfs4_ff_layout_mirror *mirror = opaque->data; 2387 2388 ff_layout_put_mirror(mirror); 2389 } 2390 2391 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2392 .encode = ff_layout_encode_layoutstats, 2393 .free = ff_layout_free_layoutstats, 2394 }; 2395 2396 static int 2397 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2398 struct nfs42_layoutstat_devinfo *devinfo, 2399 int dev_limit) 2400 { 2401 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2402 struct nfs4_ff_layout_mirror *mirror; 2403 struct nfs4_deviceid_node *dev; 2404 int i = 0; 2405 2406 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2407 if (i >= dev_limit) 2408 break; 2409 if (IS_ERR_OR_NULL(mirror->mirror_ds)) 2410 continue; 2411 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags)) 2412 continue; 2413 /* mirror refcount put in cleanup_layoutstats */ 2414 if (!refcount_inc_not_zero(&mirror->ref)) 2415 continue; 2416 dev = &mirror->mirror_ds->id_node; 2417 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE); 2418 devinfo->offset = 0; 2419 devinfo->length = NFS4_MAX_UINT64; 2420 spin_lock(&mirror->lock); 2421 devinfo->read_count = mirror->read_stat.io_stat.ops_completed; 2422 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed; 2423 devinfo->write_count = mirror->write_stat.io_stat.ops_completed; 2424 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed; 2425 spin_unlock(&mirror->lock); 2426 devinfo->layout_type = LAYOUT_FLEX_FILES; 2427 devinfo->ld_private.ops = &layoutstat_ops; 2428 devinfo->ld_private.data = mirror; 2429 2430 devinfo++; 2431 i++; 2432 } 2433 return i; 2434 } 2435 2436 static int 2437 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2438 { 2439 struct nfs4_flexfile_layout *ff_layout; 2440 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2441 2442 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2443 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), 2444 nfs_io_gfp_mask()); 2445 if (!args->devinfo) 2446 return -ENOMEM; 2447 2448 spin_lock(&args->inode->i_lock); 2449 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout); 2450 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2451 &args->devinfo[0], dev_count); 2452 spin_unlock(&args->inode->i_lock); 2453 if (!args->num_dev) { 2454 kfree(args->devinfo); 2455 args->devinfo = NULL; 2456 return -ENOENT; 2457 } 2458 2459 return 0; 2460 } 2461 2462 static int 2463 ff_layout_set_layoutdriver(struct nfs_server *server, 2464 const struct nfs_fh *dummy) 2465 { 2466 #if IS_ENABLED(CONFIG_NFS_V4_2) 2467 server->caps |= NFS_CAP_LAYOUTSTATS; 2468 #endif 2469 return 0; 2470 } 2471 2472 static const struct pnfs_commit_ops ff_layout_commit_ops = { 2473 .setup_ds_info = ff_layout_setup_ds_info, 2474 .release_ds_info = ff_layout_release_ds_info, 2475 .mark_request_commit = pnfs_layout_mark_request_commit, 2476 .clear_request_commit = pnfs_generic_clear_request_commit, 2477 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2478 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2479 .commit_pagelist = ff_layout_commit_pagelist, 2480 }; 2481 2482 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2483 .id = LAYOUT_FLEX_FILES, 2484 .name = "LAYOUT_FLEX_FILES", 2485 .owner = THIS_MODULE, 2486 .flags = PNFS_LAYOUTGET_ON_OPEN, 2487 .max_layoutget_response = 4096, /* 1 page or so... */ 2488 .set_layoutdriver = ff_layout_set_layoutdriver, 2489 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2490 .free_layout_hdr = ff_layout_free_layout_hdr, 2491 .alloc_lseg = ff_layout_alloc_lseg, 2492 .free_lseg = ff_layout_free_lseg, 2493 .add_lseg = ff_layout_add_lseg, 2494 .pg_read_ops = &ff_layout_pg_read_ops, 2495 .pg_write_ops = &ff_layout_pg_write_ops, 2496 .get_ds_info = ff_layout_get_ds_info, 2497 .free_deviceid_node = ff_layout_free_deviceid_node, 2498 .read_pagelist = ff_layout_read_pagelist, 2499 .write_pagelist = ff_layout_write_pagelist, 2500 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 2501 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 2502 .sync = pnfs_nfs_generic_sync, 2503 .prepare_layoutstats = ff_layout_prepare_layoutstats, 2504 }; 2505 2506 static int __init nfs4flexfilelayout_init(void) 2507 { 2508 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 2509 __func__); 2510 return pnfs_register_layoutdriver(&flexfilelayout_type); 2511 } 2512 2513 static void __exit nfs4flexfilelayout_exit(void) 2514 { 2515 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 2516 __func__); 2517 pnfs_unregister_layoutdriver(&flexfilelayout_type); 2518 } 2519 2520 MODULE_ALIAS("nfs-layouttype4-4"); 2521 2522 MODULE_LICENSE("GPL"); 2523 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 2524 2525 module_init(nfs4flexfilelayout_init); 2526 module_exit(nfs4flexfilelayout_exit); 2527 2528 module_param(io_maxretrans, ushort, 0644); 2529 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client " 2530 "retries an I/O request before returning an error. "); 2531