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_page.h> 12 #include <linux/module.h> 13 #include <linux/sched/mm.h> 14 15 #include <linux/sunrpc/metrics.h> 16 17 #include "flexfilelayout.h" 18 #include "../nfs4session.h" 19 #include "../nfs4idmap.h" 20 #include "../internal.h" 21 #include "../delegation.h" 22 #include "../nfs4trace.h" 23 #include "../iostat.h" 24 #include "../nfs.h" 25 #include "../nfs42.h" 26 27 #define NFSDBG_FACILITY NFSDBG_PNFS_LD 28 29 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ) 30 #define FF_LAYOUTRETURN_MAXERR 20 31 32 static unsigned short io_maxretrans; 33 34 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 35 struct nfs_pgio_header *hdr); 36 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 37 struct nfs42_layoutstat_devinfo *devinfo, 38 int dev_limit); 39 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 40 const struct nfs42_layoutstat_devinfo *devinfo, 41 struct nfs4_ff_layout_mirror *mirror); 42 43 static struct pnfs_layout_hdr * 44 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 45 { 46 struct nfs4_flexfile_layout *ffl; 47 48 ffl = kzalloc(sizeof(*ffl), gfp_flags); 49 if (ffl) { 50 INIT_LIST_HEAD(&ffl->error_list); 51 INIT_LIST_HEAD(&ffl->mirrors); 52 ffl->last_report_time = ktime_get(); 53 return &ffl->generic_hdr; 54 } else 55 return NULL; 56 } 57 58 static void 59 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo) 60 { 61 struct nfs4_ff_layout_ds_err *err, *n; 62 63 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list, 64 list) { 65 list_del(&err->list); 66 kfree(err); 67 } 68 kfree(FF_LAYOUT_FROM_HDR(lo)); 69 } 70 71 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 72 { 73 __be32 *p; 74 75 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 76 if (unlikely(p == NULL)) 77 return -ENOBUFS; 78 stateid->type = NFS4_PNFS_DS_STATEID_TYPE; 79 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 80 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__, 81 p[0], p[1], p[2], p[3]); 82 return 0; 83 } 84 85 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid) 86 { 87 __be32 *p; 88 89 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE); 90 if (unlikely(!p)) 91 return -ENOBUFS; 92 memcpy(devid, p, NFS4_DEVICEID4_SIZE); 93 nfs4_print_deviceid(devid); 94 return 0; 95 } 96 97 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 98 { 99 __be32 *p; 100 101 p = xdr_inline_decode(xdr, 4); 102 if (unlikely(!p)) 103 return -ENOBUFS; 104 fh->size = be32_to_cpup(p++); 105 if (fh->size > sizeof(struct nfs_fh)) { 106 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n", 107 fh->size); 108 return -EOVERFLOW; 109 } 110 /* fh.data */ 111 p = xdr_inline_decode(xdr, fh->size); 112 if (unlikely(!p)) 113 return -ENOBUFS; 114 memcpy(&fh->data, p, fh->size); 115 dprintk("%s: fh len %d\n", __func__, fh->size); 116 117 return 0; 118 } 119 120 /* 121 * Currently only stringified uids and gids are accepted. 122 * I.e., kerberos is not supported to the DSes, so no pricipals. 123 * 124 * That means that one common function will suffice, but when 125 * principals are added, this should be split to accomodate 126 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid(). 127 */ 128 static int 129 decode_name(struct xdr_stream *xdr, u32 *id) 130 { 131 __be32 *p; 132 int len; 133 134 /* opaque_length(4)*/ 135 p = xdr_inline_decode(xdr, 4); 136 if (unlikely(!p)) 137 return -ENOBUFS; 138 len = be32_to_cpup(p++); 139 if (len < 0) 140 return -EINVAL; 141 142 dprintk("%s: len %u\n", __func__, len); 143 144 /* opaque body */ 145 p = xdr_inline_decode(xdr, len); 146 if (unlikely(!p)) 147 return -ENOBUFS; 148 149 if (!nfs_map_string_to_numeric((char *)p, len, id)) 150 return -EINVAL; 151 152 return 0; 153 } 154 155 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1, 156 const struct nfs4_ff_layout_mirror *m2) 157 { 158 int i, j; 159 160 if (m1->fh_versions_cnt != m2->fh_versions_cnt) 161 return false; 162 for (i = 0; i < m1->fh_versions_cnt; i++) { 163 bool found_fh = false; 164 for (j = 0; j < m2->fh_versions_cnt; j++) { 165 if (nfs_compare_fh(&m1->fh_versions[i], 166 &m2->fh_versions[j]) == 0) { 167 found_fh = true; 168 break; 169 } 170 } 171 if (!found_fh) 172 return false; 173 } 174 return true; 175 } 176 177 static struct nfs4_ff_layout_mirror * 178 ff_layout_add_mirror(struct pnfs_layout_hdr *lo, 179 struct nfs4_ff_layout_mirror *mirror) 180 { 181 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 182 struct nfs4_ff_layout_mirror *pos; 183 struct inode *inode = lo->plh_inode; 184 185 spin_lock(&inode->i_lock); 186 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) { 187 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0) 188 continue; 189 if (!ff_mirror_match_fh(mirror, pos)) 190 continue; 191 if (refcount_inc_not_zero(&pos->ref)) { 192 spin_unlock(&inode->i_lock); 193 return pos; 194 } 195 } 196 list_add(&mirror->mirrors, &ff_layout->mirrors); 197 mirror->layout = lo; 198 spin_unlock(&inode->i_lock); 199 return mirror; 200 } 201 202 static void 203 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror) 204 { 205 struct inode *inode; 206 if (mirror->layout == NULL) 207 return; 208 inode = mirror->layout->plh_inode; 209 spin_lock(&inode->i_lock); 210 list_del(&mirror->mirrors); 211 spin_unlock(&inode->i_lock); 212 mirror->layout = NULL; 213 } 214 215 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags) 216 { 217 struct nfs4_ff_layout_mirror *mirror; 218 219 mirror = kzalloc(sizeof(*mirror), gfp_flags); 220 if (mirror != NULL) { 221 spin_lock_init(&mirror->lock); 222 refcount_set(&mirror->ref, 1); 223 INIT_LIST_HEAD(&mirror->mirrors); 224 } 225 return mirror; 226 } 227 228 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror) 229 { 230 const struct cred *cred; 231 232 ff_layout_remove_mirror(mirror); 233 kfree(mirror->fh_versions); 234 cred = rcu_access_pointer(mirror->ro_cred); 235 put_cred(cred); 236 cred = rcu_access_pointer(mirror->rw_cred); 237 put_cred(cred); 238 nfs4_ff_layout_put_deviceid(mirror->mirror_ds); 239 kfree(mirror); 240 } 241 242 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror) 243 { 244 if (mirror != NULL && refcount_dec_and_test(&mirror->ref)) 245 ff_layout_free_mirror(mirror); 246 } 247 248 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls) 249 { 250 int i; 251 252 if (fls->mirror_array) { 253 for (i = 0; i < fls->mirror_array_cnt; i++) { 254 /* normally mirror_ds is freed in 255 * .free_deviceid_node but we still do it here 256 * for .alloc_lseg error path */ 257 ff_layout_put_mirror(fls->mirror_array[i]); 258 } 259 kfree(fls->mirror_array); 260 fls->mirror_array = NULL; 261 } 262 } 263 264 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr) 265 { 266 int ret = 0; 267 268 dprintk("--> %s\n", __func__); 269 270 /* FIXME: remove this check when layout segment support is added */ 271 if (lgr->range.offset != 0 || 272 lgr->range.length != NFS4_MAX_UINT64) { 273 dprintk("%s Only whole file layouts supported. Use MDS i/o\n", 274 __func__); 275 ret = -EINVAL; 276 } 277 278 dprintk("--> %s returns %d\n", __func__, ret); 279 return ret; 280 } 281 282 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls) 283 { 284 if (fls) { 285 ff_layout_free_mirror_array(fls); 286 kfree(fls); 287 } 288 } 289 290 static bool 291 ff_lseg_range_is_after(const struct pnfs_layout_range *l1, 292 const struct pnfs_layout_range *l2) 293 { 294 u64 end1, end2; 295 296 if (l1->iomode != l2->iomode) 297 return l1->iomode != IOMODE_READ; 298 end1 = pnfs_calc_offset_end(l1->offset, l1->length); 299 end2 = pnfs_calc_offset_end(l2->offset, l2->length); 300 if (end1 < l2->offset) 301 return false; 302 if (end2 < l1->offset) 303 return true; 304 return l2->offset <= l1->offset; 305 } 306 307 static bool 308 ff_lseg_merge(struct pnfs_layout_segment *new, 309 struct pnfs_layout_segment *old) 310 { 311 u64 new_end, old_end; 312 313 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags)) 314 return false; 315 if (new->pls_range.iomode != old->pls_range.iomode) 316 return false; 317 old_end = pnfs_calc_offset_end(old->pls_range.offset, 318 old->pls_range.length); 319 if (old_end < new->pls_range.offset) 320 return false; 321 new_end = pnfs_calc_offset_end(new->pls_range.offset, 322 new->pls_range.length); 323 if (new_end < old->pls_range.offset) 324 return false; 325 326 /* Mergeable: copy info from 'old' to 'new' */ 327 if (new_end < old_end) 328 new_end = old_end; 329 if (new->pls_range.offset < old->pls_range.offset) 330 new->pls_range.offset = old->pls_range.offset; 331 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset, 332 new_end); 333 if (test_bit(NFS_LSEG_ROC, &old->pls_flags)) 334 set_bit(NFS_LSEG_ROC, &new->pls_flags); 335 return true; 336 } 337 338 static void 339 ff_layout_add_lseg(struct pnfs_layout_hdr *lo, 340 struct pnfs_layout_segment *lseg, 341 struct list_head *free_me) 342 { 343 pnfs_generic_layout_insert_lseg(lo, lseg, 344 ff_lseg_range_is_after, 345 ff_lseg_merge, 346 free_me); 347 } 348 349 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls) 350 { 351 int i, j; 352 353 for (i = 0; i < fls->mirror_array_cnt - 1; i++) { 354 for (j = i + 1; j < fls->mirror_array_cnt; j++) 355 if (fls->mirror_array[i]->efficiency < 356 fls->mirror_array[j]->efficiency) 357 swap(fls->mirror_array[i], 358 fls->mirror_array[j]); 359 } 360 } 361 362 static struct pnfs_layout_segment * 363 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh, 364 struct nfs4_layoutget_res *lgr, 365 gfp_t gfp_flags) 366 { 367 struct pnfs_layout_segment *ret; 368 struct nfs4_ff_layout_segment *fls = NULL; 369 struct xdr_stream stream; 370 struct xdr_buf buf; 371 struct page *scratch; 372 u64 stripe_unit; 373 u32 mirror_array_cnt; 374 __be32 *p; 375 int i, rc; 376 377 dprintk("--> %s\n", __func__); 378 scratch = alloc_page(gfp_flags); 379 if (!scratch) 380 return ERR_PTR(-ENOMEM); 381 382 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, 383 lgr->layoutp->len); 384 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 385 386 /* stripe unit and mirror_array_cnt */ 387 rc = -EIO; 388 p = xdr_inline_decode(&stream, 8 + 4); 389 if (!p) 390 goto out_err_free; 391 392 p = xdr_decode_hyper(p, &stripe_unit); 393 mirror_array_cnt = be32_to_cpup(p++); 394 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__, 395 stripe_unit, mirror_array_cnt); 396 397 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT || 398 mirror_array_cnt == 0) 399 goto out_err_free; 400 401 rc = -ENOMEM; 402 fls = kzalloc(sizeof(*fls), gfp_flags); 403 if (!fls) 404 goto out_err_free; 405 406 fls->mirror_array_cnt = mirror_array_cnt; 407 fls->stripe_unit = stripe_unit; 408 fls->mirror_array = kcalloc(fls->mirror_array_cnt, 409 sizeof(fls->mirror_array[0]), gfp_flags); 410 if (fls->mirror_array == NULL) 411 goto out_err_free; 412 413 for (i = 0; i < fls->mirror_array_cnt; i++) { 414 struct nfs4_ff_layout_mirror *mirror; 415 struct cred *kcred; 416 const struct cred __rcu *cred; 417 kuid_t uid; 418 kgid_t gid; 419 u32 ds_count, fh_count, id; 420 int j; 421 422 rc = -EIO; 423 p = xdr_inline_decode(&stream, 4); 424 if (!p) 425 goto out_err_free; 426 ds_count = be32_to_cpup(p); 427 428 /* FIXME: allow for striping? */ 429 if (ds_count != 1) 430 goto out_err_free; 431 432 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags); 433 if (fls->mirror_array[i] == NULL) { 434 rc = -ENOMEM; 435 goto out_err_free; 436 } 437 438 fls->mirror_array[i]->ds_count = ds_count; 439 440 /* deviceid */ 441 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid); 442 if (rc) 443 goto out_err_free; 444 445 /* efficiency */ 446 rc = -EIO; 447 p = xdr_inline_decode(&stream, 4); 448 if (!p) 449 goto out_err_free; 450 fls->mirror_array[i]->efficiency = be32_to_cpup(p); 451 452 /* stateid */ 453 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid); 454 if (rc) 455 goto out_err_free; 456 457 /* fh */ 458 rc = -EIO; 459 p = xdr_inline_decode(&stream, 4); 460 if (!p) 461 goto out_err_free; 462 fh_count = be32_to_cpup(p); 463 464 fls->mirror_array[i]->fh_versions = 465 kcalloc(fh_count, sizeof(struct nfs_fh), 466 gfp_flags); 467 if (fls->mirror_array[i]->fh_versions == NULL) { 468 rc = -ENOMEM; 469 goto out_err_free; 470 } 471 472 for (j = 0; j < fh_count; j++) { 473 rc = decode_nfs_fh(&stream, 474 &fls->mirror_array[i]->fh_versions[j]); 475 if (rc) 476 goto out_err_free; 477 } 478 479 fls->mirror_array[i]->fh_versions_cnt = fh_count; 480 481 /* user */ 482 rc = decode_name(&stream, &id); 483 if (rc) 484 goto out_err_free; 485 486 uid = make_kuid(&init_user_ns, id); 487 488 /* group */ 489 rc = decode_name(&stream, &id); 490 if (rc) 491 goto out_err_free; 492 493 gid = make_kgid(&init_user_ns, id); 494 495 if (gfp_flags & __GFP_FS) 496 kcred = prepare_kernel_cred(NULL); 497 else { 498 unsigned int nofs_flags = memalloc_nofs_save(); 499 kcred = prepare_kernel_cred(NULL); 500 memalloc_nofs_restore(nofs_flags); 501 } 502 rc = -ENOMEM; 503 if (!kcred) 504 goto out_err_free; 505 kcred->fsuid = uid; 506 kcred->fsgid = gid; 507 cred = RCU_INITIALIZER(kcred); 508 509 if (lgr->range.iomode == IOMODE_READ) 510 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 511 else 512 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 513 514 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]); 515 if (mirror != fls->mirror_array[i]) { 516 /* swap cred ptrs so free_mirror will clean up old */ 517 if (lgr->range.iomode == IOMODE_READ) { 518 cred = xchg(&mirror->ro_cred, cred); 519 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred); 520 } else { 521 cred = xchg(&mirror->rw_cred, cred); 522 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred); 523 } 524 ff_layout_free_mirror(fls->mirror_array[i]); 525 fls->mirror_array[i] = mirror; 526 } 527 528 dprintk("%s: iomode %s uid %u gid %u\n", __func__, 529 lgr->range.iomode == IOMODE_READ ? "READ" : "RW", 530 from_kuid(&init_user_ns, uid), 531 from_kgid(&init_user_ns, gid)); 532 } 533 534 p = xdr_inline_decode(&stream, 4); 535 if (!p) 536 goto out_sort_mirrors; 537 fls->flags = be32_to_cpup(p); 538 539 p = xdr_inline_decode(&stream, 4); 540 if (!p) 541 goto out_sort_mirrors; 542 for (i=0; i < fls->mirror_array_cnt; i++) 543 fls->mirror_array[i]->report_interval = be32_to_cpup(p); 544 545 out_sort_mirrors: 546 ff_layout_sort_mirrors(fls); 547 rc = ff_layout_check_layout(lgr); 548 if (rc) 549 goto out_err_free; 550 ret = &fls->generic_hdr; 551 dprintk("<-- %s (success)\n", __func__); 552 out_free_page: 553 __free_page(scratch); 554 return ret; 555 out_err_free: 556 _ff_layout_free_lseg(fls); 557 ret = ERR_PTR(rc); 558 dprintk("<-- %s (%d)\n", __func__, rc); 559 goto out_free_page; 560 } 561 562 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout) 563 { 564 struct pnfs_layout_segment *lseg; 565 566 list_for_each_entry(lseg, &layout->plh_segs, pls_list) 567 if (lseg->pls_range.iomode == IOMODE_RW) 568 return true; 569 570 return false; 571 } 572 573 static void 574 ff_layout_free_lseg(struct pnfs_layout_segment *lseg) 575 { 576 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 577 578 dprintk("--> %s\n", __func__); 579 580 if (lseg->pls_range.iomode == IOMODE_RW) { 581 struct nfs4_flexfile_layout *ffl; 582 struct inode *inode; 583 584 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout); 585 inode = ffl->generic_hdr.plh_inode; 586 spin_lock(&inode->i_lock); 587 if (!ff_layout_has_rw_segments(lseg->pls_layout)) { 588 ffl->commit_info.nbuckets = 0; 589 kfree(ffl->commit_info.buckets); 590 ffl->commit_info.buckets = NULL; 591 } 592 spin_unlock(&inode->i_lock); 593 } 594 _ff_layout_free_lseg(fls); 595 } 596 597 /* Return 1 until we have multiple lsegs support */ 598 static int 599 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls) 600 { 601 return 1; 602 } 603 604 static void 605 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 606 { 607 /* first IO request? */ 608 if (atomic_inc_return(&timer->n_ops) == 1) { 609 timer->start_time = now; 610 } 611 } 612 613 static ktime_t 614 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 615 { 616 ktime_t start; 617 618 if (atomic_dec_return(&timer->n_ops) < 0) 619 WARN_ON_ONCE(1); 620 621 start = timer->start_time; 622 timer->start_time = now; 623 return ktime_sub(now, start); 624 } 625 626 static bool 627 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 628 struct nfs4_ff_layoutstat *layoutstat, 629 ktime_t now) 630 { 631 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL; 632 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout); 633 634 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now); 635 if (!mirror->start_time) 636 mirror->start_time = now; 637 if (mirror->report_interval != 0) 638 report_interval = (s64)mirror->report_interval * 1000LL; 639 else if (layoutstats_timer != 0) 640 report_interval = (s64)layoutstats_timer * 1000LL; 641 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >= 642 report_interval) { 643 ffl->last_report_time = now; 644 return true; 645 } 646 647 return false; 648 } 649 650 static void 651 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat, 652 __u64 requested) 653 { 654 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 655 656 iostat->ops_requested++; 657 iostat->bytes_requested += requested; 658 } 659 660 static void 661 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat, 662 __u64 requested, 663 __u64 completed, 664 ktime_t time_completed, 665 ktime_t time_started) 666 { 667 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 668 ktime_t completion_time = ktime_sub(time_completed, time_started); 669 ktime_t timer; 670 671 iostat->ops_completed++; 672 iostat->bytes_completed += completed; 673 iostat->bytes_not_delivered += requested - completed; 674 675 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed); 676 iostat->total_busy_time = 677 ktime_add(iostat->total_busy_time, timer); 678 iostat->aggregate_completion_time = 679 ktime_add(iostat->aggregate_completion_time, 680 completion_time); 681 } 682 683 static void 684 nfs4_ff_layout_stat_io_start_read(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->read_stat, now); 692 nfs4_ff_layout_stat_io_update_requested(&mirror->read_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_KERNEL); 698 } 699 700 static void 701 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task, 702 struct nfs4_ff_layout_mirror *mirror, 703 __u64 requested, 704 __u64 completed) 705 { 706 spin_lock(&mirror->lock); 707 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat, 708 requested, completed, 709 ktime_get(), task->tk_start); 710 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 711 spin_unlock(&mirror->lock); 712 } 713 714 static void 715 nfs4_ff_layout_stat_io_start_write(struct inode *inode, 716 struct nfs4_ff_layout_mirror *mirror, 717 __u64 requested, ktime_t now) 718 { 719 bool report; 720 721 spin_lock(&mirror->lock); 722 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now); 723 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested); 724 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 725 spin_unlock(&mirror->lock); 726 727 if (report) 728 pnfs_report_layoutstat(inode, GFP_NOIO); 729 } 730 731 static void 732 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, 733 struct nfs4_ff_layout_mirror *mirror, 734 __u64 requested, 735 __u64 completed, 736 enum nfs3_stable_how committed) 737 { 738 if (committed == NFS_UNSTABLE) 739 requested = completed = 0; 740 741 spin_lock(&mirror->lock); 742 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat, 743 requested, completed, ktime_get(), task->tk_start); 744 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 745 spin_unlock(&mirror->lock); 746 } 747 748 static int 749 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg, 750 struct nfs_commit_info *cinfo, 751 gfp_t gfp_flags) 752 { 753 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 754 struct pnfs_commit_bucket *buckets; 755 int size; 756 757 if (cinfo->ds->nbuckets != 0) { 758 /* This assumes there is only one RW lseg per file. 759 * To support multiple lseg per file, we need to 760 * change struct pnfs_commit_bucket to allow dynamic 761 * increasing nbuckets. 762 */ 763 return 0; 764 } 765 766 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg); 767 768 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket), 769 gfp_flags); 770 if (!buckets) 771 return -ENOMEM; 772 else { 773 int i; 774 775 spin_lock(&cinfo->inode->i_lock); 776 if (cinfo->ds->nbuckets != 0) 777 kfree(buckets); 778 else { 779 cinfo->ds->buckets = buckets; 780 cinfo->ds->nbuckets = size; 781 for (i = 0; i < size; i++) { 782 INIT_LIST_HEAD(&buckets[i].written); 783 INIT_LIST_HEAD(&buckets[i].committing); 784 /* mark direct verifier as unset */ 785 buckets[i].direct_verf.committed = 786 NFS_INVALID_STABLE_HOW; 787 } 788 } 789 spin_unlock(&cinfo->inode->i_lock); 790 return 0; 791 } 792 } 793 794 static void 795 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx) 796 { 797 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 798 799 if (devid) 800 nfs4_mark_deviceid_unavailable(devid); 801 } 802 803 static void 804 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx) 805 { 806 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 807 808 if (devid) 809 nfs4_mark_deviceid_available(devid); 810 } 811 812 static struct nfs4_pnfs_ds * 813 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, 814 int start_idx, int *best_idx, 815 bool check_device) 816 { 817 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 818 struct nfs4_ff_layout_mirror *mirror; 819 struct nfs4_pnfs_ds *ds; 820 bool fail_return = false; 821 int idx; 822 823 /* mirrors are initially sorted by efficiency */ 824 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 825 if (idx+1 == fls->mirror_array_cnt) 826 fail_return = !check_device; 827 828 mirror = FF_LAYOUT_COMP(lseg, idx); 829 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return); 830 if (!ds) 831 continue; 832 833 if (check_device && 834 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node)) 835 continue; 836 837 *best_idx = idx; 838 return ds; 839 } 840 841 return NULL; 842 } 843 844 static struct nfs4_pnfs_ds * 845 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg, 846 int start_idx, int *best_idx) 847 { 848 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false); 849 } 850 851 static struct nfs4_pnfs_ds * 852 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg, 853 int start_idx, int *best_idx) 854 { 855 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true); 856 } 857 858 static struct nfs4_pnfs_ds * 859 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 860 int start_idx, int *best_idx) 861 { 862 struct nfs4_pnfs_ds *ds; 863 864 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx); 865 if (ds) 866 return ds; 867 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx); 868 } 869 870 static void 871 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio, 872 struct nfs_page *req, 873 bool strict_iomode) 874 { 875 pnfs_put_lseg(pgio->pg_lseg); 876 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 877 nfs_req_openctx(req), 878 0, 879 NFS4_MAX_UINT64, 880 IOMODE_READ, 881 strict_iomode, 882 GFP_KERNEL); 883 if (IS_ERR(pgio->pg_lseg)) { 884 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 885 pgio->pg_lseg = NULL; 886 } 887 } 888 889 static void 890 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 891 struct nfs_page *req) 892 { 893 struct nfs_pgio_mirror *pgm; 894 struct nfs4_ff_layout_mirror *mirror; 895 struct nfs4_pnfs_ds *ds; 896 int ds_idx; 897 898 retry: 899 pnfs_generic_pg_check_layout(pgio); 900 /* Use full layout for now */ 901 if (!pgio->pg_lseg) { 902 ff_layout_pg_get_read(pgio, req, false); 903 if (!pgio->pg_lseg) 904 goto out_nolseg; 905 } 906 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 907 ff_layout_pg_get_read(pgio, req, true); 908 if (!pgio->pg_lseg) 909 goto out_nolseg; 910 } 911 912 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx); 913 if (!ds) { 914 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 915 goto out_mds; 916 pnfs_put_lseg(pgio->pg_lseg); 917 pgio->pg_lseg = NULL; 918 /* Sleep for 1 second before retrying */ 919 ssleep(1); 920 goto retry; 921 } 922 923 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 924 925 pgio->pg_mirror_idx = ds_idx; 926 927 /* read always uses only one mirror - idx 0 for pgio layer */ 928 pgm = &pgio->pg_mirrors[0]; 929 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize; 930 931 pgio->pg_maxretrans = io_maxretrans; 932 return; 933 out_nolseg: 934 if (pgio->pg_error < 0) 935 return; 936 out_mds: 937 pnfs_put_lseg(pgio->pg_lseg); 938 pgio->pg_lseg = NULL; 939 nfs_pageio_reset_read_mds(pgio); 940 } 941 942 static void 943 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 944 struct nfs_page *req) 945 { 946 struct nfs4_ff_layout_mirror *mirror; 947 struct nfs_pgio_mirror *pgm; 948 struct nfs_commit_info cinfo; 949 struct nfs4_pnfs_ds *ds; 950 int i; 951 int status; 952 953 retry: 954 pnfs_generic_pg_check_layout(pgio); 955 if (!pgio->pg_lseg) { 956 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 957 nfs_req_openctx(req), 958 0, 959 NFS4_MAX_UINT64, 960 IOMODE_RW, 961 false, 962 GFP_NOFS); 963 if (IS_ERR(pgio->pg_lseg)) { 964 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 965 pgio->pg_lseg = NULL; 966 return; 967 } 968 } 969 /* If no lseg, fall back to write through mds */ 970 if (pgio->pg_lseg == NULL) 971 goto out_mds; 972 973 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq); 974 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS); 975 if (status < 0) 976 goto out_mds; 977 978 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 979 if (WARN_ON_ONCE(pgio->pg_mirror_count != 980 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))) 981 goto out_mds; 982 983 for (i = 0; i < pgio->pg_mirror_count; i++) { 984 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 985 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true); 986 if (!ds) { 987 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 988 goto out_mds; 989 pnfs_put_lseg(pgio->pg_lseg); 990 pgio->pg_lseg = NULL; 991 /* Sleep for 1 second before retrying */ 992 ssleep(1); 993 goto retry; 994 } 995 pgm = &pgio->pg_mirrors[i]; 996 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize; 997 } 998 999 pgio->pg_maxretrans = io_maxretrans; 1000 return; 1001 1002 out_mds: 1003 pnfs_put_lseg(pgio->pg_lseg); 1004 pgio->pg_lseg = NULL; 1005 nfs_pageio_reset_write_mds(pgio); 1006 } 1007 1008 static unsigned int 1009 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 1010 struct nfs_page *req) 1011 { 1012 if (!pgio->pg_lseg) { 1013 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 1014 nfs_req_openctx(req), 1015 0, 1016 NFS4_MAX_UINT64, 1017 IOMODE_RW, 1018 false, 1019 GFP_NOFS); 1020 if (IS_ERR(pgio->pg_lseg)) { 1021 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 1022 pgio->pg_lseg = NULL; 1023 goto out; 1024 } 1025 } 1026 if (pgio->pg_lseg) 1027 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 1028 1029 /* no lseg means that pnfs is not in use, so no mirroring here */ 1030 nfs_pageio_reset_write_mds(pgio); 1031 out: 1032 return 1; 1033 } 1034 1035 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 1036 .pg_init = ff_layout_pg_init_read, 1037 .pg_test = pnfs_generic_pg_test, 1038 .pg_doio = pnfs_generic_pg_readpages, 1039 .pg_cleanup = pnfs_generic_pg_cleanup, 1040 }; 1041 1042 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 1043 .pg_init = ff_layout_pg_init_write, 1044 .pg_test = pnfs_generic_pg_test, 1045 .pg_doio = pnfs_generic_pg_writepages, 1046 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 1047 .pg_cleanup = pnfs_generic_pg_cleanup, 1048 }; 1049 1050 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 1051 { 1052 struct rpc_task *task = &hdr->task; 1053 1054 pnfs_layoutcommit_inode(hdr->inode, false); 1055 1056 if (retry_pnfs) { 1057 dprintk("%s Reset task %5u for i/o through pNFS " 1058 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1059 hdr->task.tk_pid, 1060 hdr->inode->i_sb->s_id, 1061 (unsigned long long)NFS_FILEID(hdr->inode), 1062 hdr->args.count, 1063 (unsigned long long)hdr->args.offset); 1064 1065 hdr->completion_ops->reschedule_io(hdr); 1066 return; 1067 } 1068 1069 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1070 dprintk("%s Reset task %5u for i/o through MDS " 1071 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1072 hdr->task.tk_pid, 1073 hdr->inode->i_sb->s_id, 1074 (unsigned long long)NFS_FILEID(hdr->inode), 1075 hdr->args.count, 1076 (unsigned long long)hdr->args.offset); 1077 1078 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1079 } 1080 } 1081 1082 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1083 { 1084 struct rpc_task *task = &hdr->task; 1085 1086 pnfs_layoutcommit_inode(hdr->inode, false); 1087 1088 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1089 dprintk("%s Reset task %5u for i/o through MDS " 1090 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1091 hdr->task.tk_pid, 1092 hdr->inode->i_sb->s_id, 1093 (unsigned long long)NFS_FILEID(hdr->inode), 1094 hdr->args.count, 1095 (unsigned long long)hdr->args.offset); 1096 1097 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1098 } 1099 } 1100 1101 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1102 struct nfs4_state *state, 1103 struct nfs_client *clp, 1104 struct pnfs_layout_segment *lseg, 1105 int idx) 1106 { 1107 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1108 struct inode *inode = lo->plh_inode; 1109 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1110 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1111 1112 switch (task->tk_status) { 1113 case -NFS4ERR_BADSESSION: 1114 case -NFS4ERR_BADSLOT: 1115 case -NFS4ERR_BAD_HIGH_SLOT: 1116 case -NFS4ERR_DEADSESSION: 1117 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1118 case -NFS4ERR_SEQ_FALSE_RETRY: 1119 case -NFS4ERR_SEQ_MISORDERED: 1120 dprintk("%s ERROR %d, Reset session. Exchangeid " 1121 "flags 0x%x\n", __func__, task->tk_status, 1122 clp->cl_exchange_flags); 1123 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1124 break; 1125 case -NFS4ERR_DELAY: 1126 case -NFS4ERR_GRACE: 1127 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1128 break; 1129 case -NFS4ERR_RETRY_UNCACHED_REP: 1130 break; 1131 case -EAGAIN: 1132 return -NFS4ERR_RESET_TO_PNFS; 1133 /* Invalidate Layout errors */ 1134 case -NFS4ERR_PNFS_NO_LAYOUT: 1135 case -ESTALE: /* mapped NFS4ERR_STALE */ 1136 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ 1137 case -EISDIR: /* mapped NFS4ERR_ISDIR */ 1138 case -NFS4ERR_FHEXPIRED: 1139 case -NFS4ERR_WRONG_TYPE: 1140 dprintk("%s Invalid layout error %d\n", __func__, 1141 task->tk_status); 1142 /* 1143 * Destroy layout so new i/o will get a new layout. 1144 * Layout will not be destroyed until all current lseg 1145 * references are put. Mark layout as invalid to resend failed 1146 * i/o and all i/o waiting on the slot table to the MDS until 1147 * layout is destroyed and a new valid layout is obtained. 1148 */ 1149 pnfs_destroy_layout(NFS_I(inode)); 1150 rpc_wake_up(&tbl->slot_tbl_waitq); 1151 goto reset; 1152 /* RPC connection errors */ 1153 case -ECONNREFUSED: 1154 case -EHOSTDOWN: 1155 case -EHOSTUNREACH: 1156 case -ENETUNREACH: 1157 case -EIO: 1158 case -ETIMEDOUT: 1159 case -EPIPE: 1160 dprintk("%s DS connection error %d\n", __func__, 1161 task->tk_status); 1162 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1163 &devid->deviceid); 1164 rpc_wake_up(&tbl->slot_tbl_waitq); 1165 /* fall through */ 1166 default: 1167 if (ff_layout_avoid_mds_available_ds(lseg)) 1168 return -NFS4ERR_RESET_TO_PNFS; 1169 reset: 1170 dprintk("%s Retry through MDS. Error %d\n", __func__, 1171 task->tk_status); 1172 return -NFS4ERR_RESET_TO_MDS; 1173 } 1174 task->tk_status = 0; 1175 return -EAGAIN; 1176 } 1177 1178 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1179 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1180 struct pnfs_layout_segment *lseg, 1181 int idx) 1182 { 1183 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx); 1184 1185 switch (task->tk_status) { 1186 /* File access problems. Don't mark the device as unavailable */ 1187 case -EACCES: 1188 case -ESTALE: 1189 case -EISDIR: 1190 case -EBADHANDLE: 1191 case -ELOOP: 1192 case -ENOSPC: 1193 case -EAGAIN: 1194 break; 1195 case -EJUKEBOX: 1196 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1197 goto out_retry; 1198 default: 1199 dprintk("%s DS connection error %d\n", __func__, 1200 task->tk_status); 1201 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1202 &devid->deviceid); 1203 } 1204 /* FIXME: Need to prevent infinite looping here. */ 1205 return -NFS4ERR_RESET_TO_PNFS; 1206 out_retry: 1207 task->tk_status = 0; 1208 rpc_restart_call_prepare(task); 1209 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1210 return -EAGAIN; 1211 } 1212 1213 static int ff_layout_async_handle_error(struct rpc_task *task, 1214 struct nfs4_state *state, 1215 struct nfs_client *clp, 1216 struct pnfs_layout_segment *lseg, 1217 int idx) 1218 { 1219 int vers = clp->cl_nfs_mod->rpc_vers->number; 1220 1221 if (task->tk_status >= 0) { 1222 ff_layout_mark_ds_reachable(lseg, idx); 1223 return 0; 1224 } 1225 1226 /* Handle the case of an invalid layout segment */ 1227 if (!pnfs_is_valid_lseg(lseg)) 1228 return -NFS4ERR_RESET_TO_PNFS; 1229 1230 switch (vers) { 1231 case 3: 1232 return ff_layout_async_handle_error_v3(task, lseg, idx); 1233 case 4: 1234 return ff_layout_async_handle_error_v4(task, state, clp, 1235 lseg, idx); 1236 default: 1237 /* should never happen */ 1238 WARN_ON_ONCE(1); 1239 return 0; 1240 } 1241 } 1242 1243 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1244 int idx, u64 offset, u64 length, 1245 u32 status, int opnum, int error) 1246 { 1247 struct nfs4_ff_layout_mirror *mirror; 1248 int err; 1249 1250 if (status == 0) { 1251 switch (error) { 1252 case -ETIMEDOUT: 1253 case -EPFNOSUPPORT: 1254 case -EPROTONOSUPPORT: 1255 case -EOPNOTSUPP: 1256 case -ECONNREFUSED: 1257 case -ECONNRESET: 1258 case -EHOSTDOWN: 1259 case -EHOSTUNREACH: 1260 case -ENETUNREACH: 1261 case -EADDRINUSE: 1262 case -ENOBUFS: 1263 case -EPIPE: 1264 case -EPERM: 1265 status = NFS4ERR_NXIO; 1266 break; 1267 case -EACCES: 1268 status = NFS4ERR_ACCESS; 1269 break; 1270 default: 1271 return; 1272 } 1273 } 1274 1275 switch (status) { 1276 case NFS4ERR_DELAY: 1277 case NFS4ERR_GRACE: 1278 return; 1279 default: 1280 break; 1281 } 1282 1283 mirror = FF_LAYOUT_COMP(lseg, idx); 1284 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1285 mirror, offset, length, status, opnum, 1286 GFP_NOIO); 1287 if (status == NFS4ERR_NXIO) 1288 ff_layout_mark_ds_unreachable(lseg, idx); 1289 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg); 1290 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1291 } 1292 1293 /* NFS_PROTO call done callback routines */ 1294 static int ff_layout_read_done_cb(struct rpc_task *task, 1295 struct nfs_pgio_header *hdr) 1296 { 1297 int new_idx = hdr->pgio_mirror_idx; 1298 int err; 1299 1300 trace_nfs4_pnfs_read(hdr, task->tk_status); 1301 if (task->tk_status < 0) 1302 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1303 hdr->args.offset, hdr->args.count, 1304 hdr->res.op_status, OP_READ, 1305 task->tk_status); 1306 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1307 hdr->ds_clp, hdr->lseg, 1308 hdr->pgio_mirror_idx); 1309 1310 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1311 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1312 switch (err) { 1313 case -NFS4ERR_RESET_TO_PNFS: 1314 if (ff_layout_choose_best_ds_for_read(hdr->lseg, 1315 hdr->pgio_mirror_idx + 1, 1316 &new_idx)) 1317 goto out_layouterror; 1318 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1319 return task->tk_status; 1320 case -NFS4ERR_RESET_TO_MDS: 1321 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1322 return task->tk_status; 1323 case -EAGAIN: 1324 goto out_eagain; 1325 } 1326 1327 return 0; 1328 out_layouterror: 1329 ff_layout_read_record_layoutstats_done(task, hdr); 1330 ff_layout_send_layouterror(hdr->lseg); 1331 hdr->pgio_mirror_idx = new_idx; 1332 out_eagain: 1333 rpc_restart_call_prepare(task); 1334 return -EAGAIN; 1335 } 1336 1337 static bool 1338 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1339 { 1340 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1341 } 1342 1343 /* 1344 * We reference the rpc_cred of the first WRITE that triggers the need for 1345 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1346 * rfc5661 is not clear about which credential should be used. 1347 * 1348 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1349 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1350 * we always send layoutcommit after DS writes. 1351 */ 1352 static void 1353 ff_layout_set_layoutcommit(struct inode *inode, 1354 struct pnfs_layout_segment *lseg, 1355 loff_t end_offset) 1356 { 1357 if (!ff_layout_need_layoutcommit(lseg)) 1358 return; 1359 1360 pnfs_set_layoutcommit(inode, lseg, end_offset); 1361 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1362 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1363 } 1364 1365 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1366 struct nfs_pgio_header *hdr) 1367 { 1368 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1369 return; 1370 nfs4_ff_layout_stat_io_start_read(hdr->inode, 1371 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1372 hdr->args.count, 1373 task->tk_start); 1374 } 1375 1376 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1377 struct nfs_pgio_header *hdr) 1378 { 1379 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1380 return; 1381 nfs4_ff_layout_stat_io_end_read(task, 1382 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1383 hdr->args.count, 1384 hdr->res.count); 1385 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1386 } 1387 1388 static int ff_layout_read_prepare_common(struct rpc_task *task, 1389 struct nfs_pgio_header *hdr) 1390 { 1391 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1392 rpc_exit(task, -EIO); 1393 return -EIO; 1394 } 1395 1396 ff_layout_read_record_layoutstats_start(task, hdr); 1397 return 0; 1398 } 1399 1400 /* 1401 * Call ops for the async read/write cases 1402 * In the case of dense layouts, the offset needs to be reset to its 1403 * original value. 1404 */ 1405 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1406 { 1407 struct nfs_pgio_header *hdr = data; 1408 1409 if (ff_layout_read_prepare_common(task, hdr)) 1410 return; 1411 1412 rpc_call_start(task); 1413 } 1414 1415 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1416 { 1417 struct nfs_pgio_header *hdr = data; 1418 1419 if (nfs4_setup_sequence(hdr->ds_clp, 1420 &hdr->args.seq_args, 1421 &hdr->res.seq_res, 1422 task)) 1423 return; 1424 1425 ff_layout_read_prepare_common(task, hdr); 1426 } 1427 1428 static void 1429 ff_layout_io_prepare_transmit(struct rpc_task *task, 1430 void *data) 1431 { 1432 struct nfs_pgio_header *hdr = data; 1433 1434 if (!pnfs_is_valid_lseg(hdr->lseg)) 1435 rpc_exit(task, -EAGAIN); 1436 } 1437 1438 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1439 { 1440 struct nfs_pgio_header *hdr = data; 1441 1442 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); 1443 1444 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1445 task->tk_status == 0) { 1446 nfs4_sequence_done(task, &hdr->res.seq_res); 1447 return; 1448 } 1449 1450 /* Note this may cause RPC to be resent */ 1451 hdr->mds_ops->rpc_call_done(task, hdr); 1452 } 1453 1454 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1455 { 1456 struct nfs_pgio_header *hdr = data; 1457 1458 ff_layout_read_record_layoutstats_done(task, hdr); 1459 rpc_count_iostats_metrics(task, 1460 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1461 } 1462 1463 static void ff_layout_read_release(void *data) 1464 { 1465 struct nfs_pgio_header *hdr = data; 1466 1467 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1468 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1469 ff_layout_send_layouterror(hdr->lseg); 1470 pnfs_read_resend_pnfs(hdr); 1471 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1472 ff_layout_reset_read(hdr); 1473 pnfs_generic_rw_release(data); 1474 } 1475 1476 1477 static int ff_layout_write_done_cb(struct rpc_task *task, 1478 struct nfs_pgio_header *hdr) 1479 { 1480 loff_t end_offs = 0; 1481 int err; 1482 1483 trace_nfs4_pnfs_write(hdr, task->tk_status); 1484 if (task->tk_status < 0) 1485 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx, 1486 hdr->args.offset, hdr->args.count, 1487 hdr->res.op_status, OP_WRITE, 1488 task->tk_status); 1489 err = ff_layout_async_handle_error(task, hdr->args.context->state, 1490 hdr->ds_clp, hdr->lseg, 1491 hdr->pgio_mirror_idx); 1492 1493 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1494 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1495 switch (err) { 1496 case -NFS4ERR_RESET_TO_PNFS: 1497 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1498 return task->tk_status; 1499 case -NFS4ERR_RESET_TO_MDS: 1500 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1501 return task->tk_status; 1502 case -EAGAIN: 1503 return -EAGAIN; 1504 } 1505 1506 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1507 hdr->res.verf->committed == NFS_DATA_SYNC) 1508 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1509 1510 /* Note: if the write is unstable, don't set end_offs until commit */ 1511 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1512 1513 /* zero out fattr since we don't care DS attr at all */ 1514 hdr->fattr.valid = 0; 1515 if (task->tk_status >= 0) 1516 nfs_writeback_update_inode(hdr); 1517 1518 return 0; 1519 } 1520 1521 static int ff_layout_commit_done_cb(struct rpc_task *task, 1522 struct nfs_commit_data *data) 1523 { 1524 int err; 1525 1526 trace_nfs4_pnfs_commit_ds(data, task->tk_status); 1527 if (task->tk_status < 0) 1528 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index, 1529 data->args.offset, data->args.count, 1530 data->res.op_status, OP_COMMIT, 1531 task->tk_status); 1532 err = ff_layout_async_handle_error(task, NULL, data->ds_clp, 1533 data->lseg, data->ds_commit_index); 1534 1535 switch (err) { 1536 case -NFS4ERR_RESET_TO_PNFS: 1537 pnfs_generic_prepare_to_resend_writes(data); 1538 return -EAGAIN; 1539 case -NFS4ERR_RESET_TO_MDS: 1540 pnfs_generic_prepare_to_resend_writes(data); 1541 return -EAGAIN; 1542 case -EAGAIN: 1543 rpc_restart_call_prepare(task); 1544 return -EAGAIN; 1545 } 1546 1547 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1548 1549 return 0; 1550 } 1551 1552 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1553 struct nfs_pgio_header *hdr) 1554 { 1555 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1556 return; 1557 nfs4_ff_layout_stat_io_start_write(hdr->inode, 1558 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1559 hdr->args.count, 1560 task->tk_start); 1561 } 1562 1563 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1564 struct nfs_pgio_header *hdr) 1565 { 1566 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1567 return; 1568 nfs4_ff_layout_stat_io_end_write(task, 1569 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx), 1570 hdr->args.count, hdr->res.count, 1571 hdr->res.verf->committed); 1572 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1573 } 1574 1575 static int ff_layout_write_prepare_common(struct rpc_task *task, 1576 struct nfs_pgio_header *hdr) 1577 { 1578 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1579 rpc_exit(task, -EIO); 1580 return -EIO; 1581 } 1582 1583 ff_layout_write_record_layoutstats_start(task, hdr); 1584 return 0; 1585 } 1586 1587 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1588 { 1589 struct nfs_pgio_header *hdr = data; 1590 1591 if (ff_layout_write_prepare_common(task, hdr)) 1592 return; 1593 1594 rpc_call_start(task); 1595 } 1596 1597 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1598 { 1599 struct nfs_pgio_header *hdr = data; 1600 1601 if (nfs4_setup_sequence(hdr->ds_clp, 1602 &hdr->args.seq_args, 1603 &hdr->res.seq_res, 1604 task)) 1605 return; 1606 1607 ff_layout_write_prepare_common(task, hdr); 1608 } 1609 1610 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1611 { 1612 struct nfs_pgio_header *hdr = data; 1613 1614 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1615 task->tk_status == 0) { 1616 nfs4_sequence_done(task, &hdr->res.seq_res); 1617 return; 1618 } 1619 1620 /* Note this may cause RPC to be resent */ 1621 hdr->mds_ops->rpc_call_done(task, hdr); 1622 } 1623 1624 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1625 { 1626 struct nfs_pgio_header *hdr = data; 1627 1628 ff_layout_write_record_layoutstats_done(task, hdr); 1629 rpc_count_iostats_metrics(task, 1630 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1631 } 1632 1633 static void ff_layout_write_release(void *data) 1634 { 1635 struct nfs_pgio_header *hdr = data; 1636 1637 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1638 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1639 ff_layout_send_layouterror(hdr->lseg); 1640 ff_layout_reset_write(hdr, true); 1641 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1642 ff_layout_reset_write(hdr, false); 1643 pnfs_generic_rw_release(data); 1644 } 1645 1646 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1647 struct nfs_commit_data *cdata) 1648 { 1649 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1650 return; 1651 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1652 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1653 0, task->tk_start); 1654 } 1655 1656 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1657 struct nfs_commit_data *cdata) 1658 { 1659 struct nfs_page *req; 1660 __u64 count = 0; 1661 1662 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 1663 return; 1664 1665 if (task->tk_status == 0) { 1666 list_for_each_entry(req, &cdata->pages, wb_list) 1667 count += req->wb_bytes; 1668 } 1669 nfs4_ff_layout_stat_io_end_write(task, 1670 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index), 1671 count, count, NFS_FILE_SYNC); 1672 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 1673 } 1674 1675 static void ff_layout_commit_prepare_common(struct rpc_task *task, 1676 struct nfs_commit_data *cdata) 1677 { 1678 ff_layout_commit_record_layoutstats_start(task, cdata); 1679 } 1680 1681 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 1682 { 1683 ff_layout_commit_prepare_common(task, data); 1684 rpc_call_start(task); 1685 } 1686 1687 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 1688 { 1689 struct nfs_commit_data *wdata = data; 1690 1691 if (nfs4_setup_sequence(wdata->ds_clp, 1692 &wdata->args.seq_args, 1693 &wdata->res.seq_res, 1694 task)) 1695 return; 1696 ff_layout_commit_prepare_common(task, data); 1697 } 1698 1699 static void ff_layout_commit_done(struct rpc_task *task, void *data) 1700 { 1701 pnfs_generic_write_commit_done(task, data); 1702 } 1703 1704 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 1705 { 1706 struct nfs_commit_data *cdata = data; 1707 1708 ff_layout_commit_record_layoutstats_done(task, cdata); 1709 rpc_count_iostats_metrics(task, 1710 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 1711 } 1712 1713 static void ff_layout_commit_release(void *data) 1714 { 1715 struct nfs_commit_data *cdata = data; 1716 1717 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 1718 pnfs_generic_commit_release(data); 1719 } 1720 1721 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 1722 .rpc_call_prepare = ff_layout_read_prepare_v3, 1723 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit, 1724 .rpc_call_done = ff_layout_read_call_done, 1725 .rpc_count_stats = ff_layout_read_count_stats, 1726 .rpc_release = ff_layout_read_release, 1727 }; 1728 1729 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 1730 .rpc_call_prepare = ff_layout_read_prepare_v4, 1731 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit, 1732 .rpc_call_done = ff_layout_read_call_done, 1733 .rpc_count_stats = ff_layout_read_count_stats, 1734 .rpc_release = ff_layout_read_release, 1735 }; 1736 1737 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 1738 .rpc_call_prepare = ff_layout_write_prepare_v3, 1739 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit, 1740 .rpc_call_done = ff_layout_write_call_done, 1741 .rpc_count_stats = ff_layout_write_count_stats, 1742 .rpc_release = ff_layout_write_release, 1743 }; 1744 1745 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 1746 .rpc_call_prepare = ff_layout_write_prepare_v4, 1747 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit, 1748 .rpc_call_done = ff_layout_write_call_done, 1749 .rpc_count_stats = ff_layout_write_count_stats, 1750 .rpc_release = ff_layout_write_release, 1751 }; 1752 1753 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 1754 .rpc_call_prepare = ff_layout_commit_prepare_v3, 1755 .rpc_call_done = ff_layout_commit_done, 1756 .rpc_count_stats = ff_layout_commit_count_stats, 1757 .rpc_release = ff_layout_commit_release, 1758 }; 1759 1760 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 1761 .rpc_call_prepare = ff_layout_commit_prepare_v4, 1762 .rpc_call_done = ff_layout_commit_done, 1763 .rpc_count_stats = ff_layout_commit_count_stats, 1764 .rpc_release = ff_layout_commit_release, 1765 }; 1766 1767 static enum pnfs_try_status 1768 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 1769 { 1770 struct pnfs_layout_segment *lseg = hdr->lseg; 1771 struct nfs4_pnfs_ds *ds; 1772 struct rpc_clnt *ds_clnt; 1773 struct nfs4_ff_layout_mirror *mirror; 1774 const struct cred *ds_cred; 1775 loff_t offset = hdr->args.offset; 1776 u32 idx = hdr->pgio_mirror_idx; 1777 int vers; 1778 struct nfs_fh *fh; 1779 1780 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 1781 __func__, hdr->inode->i_ino, 1782 hdr->args.pgbase, (size_t)hdr->args.count, offset); 1783 1784 mirror = FF_LAYOUT_COMP(lseg, idx); 1785 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false); 1786 if (!ds) 1787 goto out_failed; 1788 1789 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1790 hdr->inode); 1791 if (IS_ERR(ds_clnt)) 1792 goto out_failed; 1793 1794 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1795 if (!ds_cred) 1796 goto out_failed; 1797 1798 vers = nfs4_ff_layout_ds_version(mirror); 1799 1800 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 1801 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 1802 1803 hdr->pgio_done_cb = ff_layout_read_done_cb; 1804 refcount_inc(&ds->ds_clp->cl_count); 1805 hdr->ds_clp = ds->ds_clp; 1806 fh = nfs4_ff_layout_select_ds_fh(mirror); 1807 if (fh) 1808 hdr->args.fh = fh; 1809 1810 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1811 1812 /* 1813 * Note that if we ever decide to split across DSes, 1814 * then we may need to handle dense-like offsets. 1815 */ 1816 hdr->args.offset = offset; 1817 hdr->mds_offset = offset; 1818 1819 /* Perform an asynchronous read to ds */ 1820 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1821 vers == 3 ? &ff_layout_read_call_ops_v3 : 1822 &ff_layout_read_call_ops_v4, 1823 0, RPC_TASK_SOFTCONN); 1824 put_cred(ds_cred); 1825 return PNFS_ATTEMPTED; 1826 1827 out_failed: 1828 if (ff_layout_avoid_mds_available_ds(lseg)) 1829 return PNFS_TRY_AGAIN; 1830 return PNFS_NOT_ATTEMPTED; 1831 } 1832 1833 /* Perform async writes. */ 1834 static enum pnfs_try_status 1835 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 1836 { 1837 struct pnfs_layout_segment *lseg = hdr->lseg; 1838 struct nfs4_pnfs_ds *ds; 1839 struct rpc_clnt *ds_clnt; 1840 struct nfs4_ff_layout_mirror *mirror; 1841 const struct cred *ds_cred; 1842 loff_t offset = hdr->args.offset; 1843 int vers; 1844 struct nfs_fh *fh; 1845 int idx = hdr->pgio_mirror_idx; 1846 1847 mirror = FF_LAYOUT_COMP(lseg, idx); 1848 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1849 if (!ds) 1850 goto out_failed; 1851 1852 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1853 hdr->inode); 1854 if (IS_ERR(ds_clnt)) 1855 goto out_failed; 1856 1857 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred); 1858 if (!ds_cred) 1859 goto out_failed; 1860 1861 vers = nfs4_ff_layout_ds_version(mirror); 1862 1863 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 1864 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 1865 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 1866 vers); 1867 1868 hdr->pgio_done_cb = ff_layout_write_done_cb; 1869 refcount_inc(&ds->ds_clp->cl_count); 1870 hdr->ds_clp = ds->ds_clp; 1871 hdr->ds_commit_idx = idx; 1872 fh = nfs4_ff_layout_select_ds_fh(mirror); 1873 if (fh) 1874 hdr->args.fh = fh; 1875 1876 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid); 1877 1878 /* 1879 * Note that if we ever decide to split across DSes, 1880 * then we may need to handle dense-like offsets. 1881 */ 1882 hdr->args.offset = offset; 1883 1884 /* Perform an asynchronous write */ 1885 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 1886 vers == 3 ? &ff_layout_write_call_ops_v3 : 1887 &ff_layout_write_call_ops_v4, 1888 sync, RPC_TASK_SOFTCONN); 1889 put_cred(ds_cred); 1890 return PNFS_ATTEMPTED; 1891 1892 out_failed: 1893 if (ff_layout_avoid_mds_available_ds(lseg)) 1894 return PNFS_TRY_AGAIN; 1895 return PNFS_NOT_ATTEMPTED; 1896 } 1897 1898 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1899 { 1900 return i; 1901 } 1902 1903 static struct nfs_fh * 1904 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) 1905 { 1906 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 1907 1908 /* FIXME: Assume that there is only one NFS version available 1909 * for the DS. 1910 */ 1911 return &flseg->mirror_array[i]->fh_versions[0]; 1912 } 1913 1914 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 1915 { 1916 struct pnfs_layout_segment *lseg = data->lseg; 1917 struct nfs4_pnfs_ds *ds; 1918 struct rpc_clnt *ds_clnt; 1919 struct nfs4_ff_layout_mirror *mirror; 1920 const struct cred *ds_cred; 1921 u32 idx; 1922 int vers, ret; 1923 struct nfs_fh *fh; 1924 1925 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 1926 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 1927 goto out_err; 1928 1929 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); 1930 mirror = FF_LAYOUT_COMP(lseg, idx); 1931 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true); 1932 if (!ds) 1933 goto out_err; 1934 1935 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 1936 data->inode); 1937 if (IS_ERR(ds_clnt)) 1938 goto out_err; 1939 1940 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred); 1941 if (!ds_cred) 1942 goto out_err; 1943 1944 vers = nfs4_ff_layout_ds_version(mirror); 1945 1946 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 1947 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 1948 vers); 1949 data->commit_done_cb = ff_layout_commit_done_cb; 1950 data->cred = ds_cred; 1951 refcount_inc(&ds->ds_clp->cl_count); 1952 data->ds_clp = ds->ds_clp; 1953 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); 1954 if (fh) 1955 data->args.fh = fh; 1956 1957 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 1958 vers == 3 ? &ff_layout_commit_call_ops_v3 : 1959 &ff_layout_commit_call_ops_v4, 1960 how, RPC_TASK_SOFTCONN); 1961 put_cred(ds_cred); 1962 return ret; 1963 out_err: 1964 pnfs_generic_prepare_to_resend_writes(data); 1965 pnfs_generic_commit_release(data); 1966 return -EAGAIN; 1967 } 1968 1969 static int 1970 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 1971 int how, struct nfs_commit_info *cinfo) 1972 { 1973 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 1974 ff_layout_initiate_commit); 1975 } 1976 1977 static struct pnfs_ds_commit_info * 1978 ff_layout_get_ds_info(struct inode *inode) 1979 { 1980 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 1981 1982 if (layout == NULL) 1983 return NULL; 1984 1985 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 1986 } 1987 1988 static void 1989 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 1990 { 1991 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 1992 id_node)); 1993 } 1994 1995 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 1996 const struct nfs4_layoutreturn_args *args, 1997 const struct nfs4_flexfile_layoutreturn_args *ff_args) 1998 { 1999 __be32 *start; 2000 2001 start = xdr_reserve_space(xdr, 4); 2002 if (unlikely(!start)) 2003 return -E2BIG; 2004 2005 *start = cpu_to_be32(ff_args->num_errors); 2006 /* This assume we always return _ALL_ layouts */ 2007 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 2008 } 2009 2010 static void 2011 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len) 2012 { 2013 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0); 2014 } 2015 2016 static void 2017 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 2018 const nfs4_stateid *stateid, 2019 const struct nfs42_layoutstat_devinfo *devinfo) 2020 { 2021 __be32 *p; 2022 2023 p = xdr_reserve_space(xdr, 8 + 8); 2024 p = xdr_encode_hyper(p, devinfo->offset); 2025 p = xdr_encode_hyper(p, devinfo->length); 2026 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 2027 p = xdr_reserve_space(xdr, 4*8); 2028 p = xdr_encode_hyper(p, devinfo->read_count); 2029 p = xdr_encode_hyper(p, devinfo->read_bytes); 2030 p = xdr_encode_hyper(p, devinfo->write_count); 2031 p = xdr_encode_hyper(p, devinfo->write_bytes); 2032 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 2033 } 2034 2035 static void 2036 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 2037 const nfs4_stateid *stateid, 2038 const struct nfs42_layoutstat_devinfo *devinfo) 2039 { 2040 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 2041 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 2042 devinfo->ld_private.data); 2043 } 2044 2045 /* report nothing for now */ 2046 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 2047 const struct nfs4_layoutreturn_args *args, 2048 struct nfs4_flexfile_layoutreturn_args *ff_args) 2049 { 2050 __be32 *p; 2051 int i; 2052 2053 p = xdr_reserve_space(xdr, 4); 2054 *p = cpu_to_be32(ff_args->num_dev); 2055 for (i = 0; i < ff_args->num_dev; i++) 2056 ff_layout_encode_ff_iostat(xdr, 2057 &args->layout->plh_stateid, 2058 &ff_args->devinfo[i]); 2059 } 2060 2061 static void 2062 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 2063 unsigned int num_entries) 2064 { 2065 unsigned int i; 2066 2067 for (i = 0; i < num_entries; i++) { 2068 if (!devinfo[i].ld_private.ops) 2069 continue; 2070 if (!devinfo[i].ld_private.ops->free) 2071 continue; 2072 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 2073 } 2074 } 2075 2076 static struct nfs4_deviceid_node * 2077 ff_layout_alloc_deviceid_node(struct nfs_server *server, 2078 struct pnfs_device *pdev, gfp_t gfp_flags) 2079 { 2080 struct nfs4_ff_layout_ds *dsaddr; 2081 2082 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2083 if (!dsaddr) 2084 return NULL; 2085 return &dsaddr->id_node; 2086 } 2087 2088 static void 2089 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2090 const void *voidargs, 2091 const struct nfs4_xdr_opaque_data *ff_opaque) 2092 { 2093 const struct nfs4_layoutreturn_args *args = voidargs; 2094 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2095 struct xdr_buf tmp_buf = { 2096 .head = { 2097 [0] = { 2098 .iov_base = page_address(ff_args->pages[0]), 2099 }, 2100 }, 2101 .buflen = PAGE_SIZE, 2102 }; 2103 struct xdr_stream tmp_xdr; 2104 __be32 *start; 2105 2106 dprintk("%s: Begin\n", __func__); 2107 2108 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL); 2109 2110 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2111 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2112 2113 start = xdr_reserve_space(xdr, 4); 2114 *start = cpu_to_be32(tmp_buf.len); 2115 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2116 2117 dprintk("%s: Return\n", __func__); 2118 } 2119 2120 static void 2121 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2122 { 2123 struct nfs4_flexfile_layoutreturn_args *ff_args; 2124 2125 if (!args->data) 2126 return; 2127 ff_args = args->data; 2128 args->data = NULL; 2129 2130 ff_layout_free_ds_ioerr(&ff_args->errors); 2131 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2132 2133 put_page(ff_args->pages[0]); 2134 kfree(ff_args); 2135 } 2136 2137 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2138 .encode = ff_layout_encode_layoutreturn, 2139 .free = ff_layout_free_layoutreturn, 2140 }; 2141 2142 static int 2143 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2144 { 2145 struct nfs4_flexfile_layoutreturn_args *ff_args; 2146 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2147 2148 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL); 2149 if (!ff_args) 2150 goto out_nomem; 2151 ff_args->pages[0] = alloc_page(GFP_KERNEL); 2152 if (!ff_args->pages[0]) 2153 goto out_nomem_free; 2154 2155 INIT_LIST_HEAD(&ff_args->errors); 2156 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2157 &args->range, &ff_args->errors, 2158 FF_LAYOUTRETURN_MAXERR); 2159 2160 spin_lock(&args->inode->i_lock); 2161 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2162 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo)); 2163 spin_unlock(&args->inode->i_lock); 2164 2165 args->ld_private->ops = &layoutreturn_ops; 2166 args->ld_private->data = ff_args; 2167 return 0; 2168 out_nomem_free: 2169 kfree(ff_args); 2170 out_nomem: 2171 return -ENOMEM; 2172 } 2173 2174 #ifdef CONFIG_NFS_V4_2 2175 void 2176 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2177 { 2178 struct pnfs_layout_hdr *lo = lseg->pls_layout; 2179 struct nfs42_layout_error *errors; 2180 LIST_HEAD(head); 2181 2182 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) 2183 return; 2184 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); 2185 if (list_empty(&head)) 2186 return; 2187 2188 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, 2189 sizeof(*errors), GFP_NOFS); 2190 if (errors != NULL) { 2191 const struct nfs4_ff_layout_ds_err *pos; 2192 size_t n = 0; 2193 2194 list_for_each_entry(pos, &head, list) { 2195 errors[n].offset = pos->offset; 2196 errors[n].length = pos->length; 2197 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); 2198 errors[n].errors[0].dev_id = pos->deviceid; 2199 errors[n].errors[0].status = pos->status; 2200 errors[n].errors[0].opnum = pos->opnum; 2201 n++; 2202 if (!list_is_last(&pos->list, &head) && 2203 n < NFS42_LAYOUTERROR_MAX) 2204 continue; 2205 if (nfs42_proc_layouterror(lseg, errors, n) < 0) 2206 break; 2207 n = 0; 2208 } 2209 kfree(errors); 2210 } 2211 ff_layout_free_ds_ioerr(&head); 2212 } 2213 #else 2214 void 2215 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2216 { 2217 } 2218 #endif 2219 2220 static int 2221 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2222 { 2223 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2224 2225 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2226 } 2227 2228 static size_t 2229 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2230 const int buflen) 2231 { 2232 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2233 const struct in6_addr *addr = &sin6->sin6_addr; 2234 2235 /* 2236 * RFC 4291, Section 2.2.2 2237 * 2238 * Shorthanded ANY address 2239 */ 2240 if (ipv6_addr_any(addr)) 2241 return snprintf(buf, buflen, "::"); 2242 2243 /* 2244 * RFC 4291, Section 2.2.2 2245 * 2246 * Shorthanded loopback address 2247 */ 2248 if (ipv6_addr_loopback(addr)) 2249 return snprintf(buf, buflen, "::1"); 2250 2251 /* 2252 * RFC 4291, Section 2.2.3 2253 * 2254 * Special presentation address format for mapped v4 2255 * addresses. 2256 */ 2257 if (ipv6_addr_v4mapped(addr)) 2258 return snprintf(buf, buflen, "::ffff:%pI4", 2259 &addr->s6_addr32[3]); 2260 2261 /* 2262 * RFC 4291, Section 2.2.1 2263 */ 2264 return snprintf(buf, buflen, "%pI6c", addr); 2265 } 2266 2267 /* Derived from rpc_sockaddr2uaddr */ 2268 static void 2269 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2270 { 2271 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2272 char portbuf[RPCBIND_MAXUADDRPLEN]; 2273 char addrbuf[RPCBIND_MAXUADDRLEN]; 2274 char *netid; 2275 unsigned short port; 2276 int len, netid_len; 2277 __be32 *p; 2278 2279 switch (sap->sa_family) { 2280 case AF_INET: 2281 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2282 return; 2283 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2284 netid = "tcp"; 2285 netid_len = 3; 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 netid = "tcp6"; 2292 netid_len = 4; 2293 break; 2294 default: 2295 /* we only support tcp and tcp6 */ 2296 WARN_ON_ONCE(1); 2297 return; 2298 } 2299 2300 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2301 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2302 2303 p = xdr_reserve_space(xdr, 4 + netid_len); 2304 xdr_encode_opaque(p, netid, netid_len); 2305 2306 p = xdr_reserve_space(xdr, 4 + len); 2307 xdr_encode_opaque(p, addrbuf, len); 2308 } 2309 2310 static void 2311 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2312 ktime_t t) 2313 { 2314 struct timespec64 ts; 2315 __be32 *p; 2316 2317 p = xdr_reserve_space(xdr, 12); 2318 ts = ktime_to_timespec64(t); 2319 p = xdr_encode_hyper(p, ts.tv_sec); 2320 *p++ = cpu_to_be32(ts.tv_nsec); 2321 } 2322 2323 static void 2324 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2325 struct nfs4_ff_io_stat *stat) 2326 { 2327 __be32 *p; 2328 2329 p = xdr_reserve_space(xdr, 5 * 8); 2330 p = xdr_encode_hyper(p, stat->ops_requested); 2331 p = xdr_encode_hyper(p, stat->bytes_requested); 2332 p = xdr_encode_hyper(p, stat->ops_completed); 2333 p = xdr_encode_hyper(p, stat->bytes_completed); 2334 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2335 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2336 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2337 } 2338 2339 static void 2340 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2341 const struct nfs42_layoutstat_devinfo *devinfo, 2342 struct nfs4_ff_layout_mirror *mirror) 2343 { 2344 struct nfs4_pnfs_ds_addr *da; 2345 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds; 2346 struct nfs_fh *fh = &mirror->fh_versions[0]; 2347 __be32 *p; 2348 2349 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2350 dprintk("%s: DS %s: encoding address %s\n", 2351 __func__, ds->ds_remotestr, da->da_remotestr); 2352 /* netaddr4 */ 2353 ff_layout_encode_netaddr(xdr, da); 2354 /* nfs_fh4 */ 2355 p = xdr_reserve_space(xdr, 4 + fh->size); 2356 xdr_encode_opaque(p, fh->data, fh->size); 2357 /* ff_io_latency4 read */ 2358 spin_lock(&mirror->lock); 2359 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat); 2360 /* ff_io_latency4 write */ 2361 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat); 2362 spin_unlock(&mirror->lock); 2363 /* nfstime4 */ 2364 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time)); 2365 /* bool */ 2366 p = xdr_reserve_space(xdr, 4); 2367 *p = cpu_to_be32(false); 2368 } 2369 2370 static void 2371 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2372 const struct nfs4_xdr_opaque_data *opaque) 2373 { 2374 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2375 struct nfs42_layoutstat_devinfo, ld_private); 2376 __be32 *start; 2377 2378 /* layoutupdate length */ 2379 start = xdr_reserve_space(xdr, 4); 2380 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2381 2382 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2383 } 2384 2385 static void 2386 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2387 { 2388 struct nfs4_ff_layout_mirror *mirror = opaque->data; 2389 2390 ff_layout_put_mirror(mirror); 2391 } 2392 2393 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2394 .encode = ff_layout_encode_layoutstats, 2395 .free = ff_layout_free_layoutstats, 2396 }; 2397 2398 static int 2399 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2400 struct nfs42_layoutstat_devinfo *devinfo, 2401 int dev_limit) 2402 { 2403 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2404 struct nfs4_ff_layout_mirror *mirror; 2405 struct nfs4_deviceid_node *dev; 2406 int i = 0; 2407 2408 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2409 if (i >= dev_limit) 2410 break; 2411 if (IS_ERR_OR_NULL(mirror->mirror_ds)) 2412 continue; 2413 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags)) 2414 continue; 2415 /* mirror refcount put in cleanup_layoutstats */ 2416 if (!refcount_inc_not_zero(&mirror->ref)) 2417 continue; 2418 dev = &mirror->mirror_ds->id_node; 2419 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE); 2420 devinfo->offset = 0; 2421 devinfo->length = NFS4_MAX_UINT64; 2422 spin_lock(&mirror->lock); 2423 devinfo->read_count = mirror->read_stat.io_stat.ops_completed; 2424 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed; 2425 devinfo->write_count = mirror->write_stat.io_stat.ops_completed; 2426 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed; 2427 spin_unlock(&mirror->lock); 2428 devinfo->layout_type = LAYOUT_FLEX_FILES; 2429 devinfo->ld_private.ops = &layoutstat_ops; 2430 devinfo->ld_private.data = mirror; 2431 2432 devinfo++; 2433 i++; 2434 } 2435 return i; 2436 } 2437 2438 static int 2439 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2440 { 2441 struct nfs4_flexfile_layout *ff_layout; 2442 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2443 2444 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2445 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO); 2446 if (!args->devinfo) 2447 return -ENOMEM; 2448 2449 spin_lock(&args->inode->i_lock); 2450 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout); 2451 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr, 2452 &args->devinfo[0], dev_count); 2453 spin_unlock(&args->inode->i_lock); 2454 if (!args->num_dev) { 2455 kfree(args->devinfo); 2456 args->devinfo = NULL; 2457 return -ENOENT; 2458 } 2459 2460 return 0; 2461 } 2462 2463 static int 2464 ff_layout_set_layoutdriver(struct nfs_server *server, 2465 const struct nfs_fh *dummy) 2466 { 2467 #if IS_ENABLED(CONFIG_NFS_V4_2) 2468 server->caps |= NFS_CAP_LAYOUTSTATS; 2469 #endif 2470 return 0; 2471 } 2472 2473 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2474 .id = LAYOUT_FLEX_FILES, 2475 .name = "LAYOUT_FLEX_FILES", 2476 .owner = THIS_MODULE, 2477 .flags = PNFS_LAYOUTGET_ON_OPEN, 2478 .max_layoutget_response = 4096, /* 1 page or so... */ 2479 .set_layoutdriver = ff_layout_set_layoutdriver, 2480 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2481 .free_layout_hdr = ff_layout_free_layout_hdr, 2482 .alloc_lseg = ff_layout_alloc_lseg, 2483 .free_lseg = ff_layout_free_lseg, 2484 .add_lseg = ff_layout_add_lseg, 2485 .pg_read_ops = &ff_layout_pg_read_ops, 2486 .pg_write_ops = &ff_layout_pg_write_ops, 2487 .get_ds_info = ff_layout_get_ds_info, 2488 .free_deviceid_node = ff_layout_free_deviceid_node, 2489 .mark_request_commit = pnfs_layout_mark_request_commit, 2490 .clear_request_commit = pnfs_generic_clear_request_commit, 2491 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2492 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2493 .commit_pagelist = ff_layout_commit_pagelist, 2494 .read_pagelist = ff_layout_read_pagelist, 2495 .write_pagelist = ff_layout_write_pagelist, 2496 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 2497 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 2498 .sync = pnfs_nfs_generic_sync, 2499 .prepare_layoutstats = ff_layout_prepare_layoutstats, 2500 }; 2501 2502 static int __init nfs4flexfilelayout_init(void) 2503 { 2504 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 2505 __func__); 2506 return pnfs_register_layoutdriver(&flexfilelayout_type); 2507 } 2508 2509 static void __exit nfs4flexfilelayout_exit(void) 2510 { 2511 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 2512 __func__); 2513 pnfs_unregister_layoutdriver(&flexfilelayout_type); 2514 } 2515 2516 MODULE_ALIAS("nfs-layouttype4-4"); 2517 2518 MODULE_LICENSE("GPL"); 2519 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 2520 2521 module_init(nfs4flexfilelayout_init); 2522 module_exit(nfs4flexfilelayout_exit); 2523 2524 module_param(io_maxretrans, ushort, 0644); 2525 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client " 2526 "retries an I/O request before returning an error. "); 2527