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/file.h> 15 #include <linux/sched/mm.h> 16 17 #include <linux/sunrpc/metrics.h> 18 19 #include "flexfilelayout.h" 20 #include "../nfs4session.h" 21 #include "../nfs4idmap.h" 22 #include "../internal.h" 23 #include "../delegation.h" 24 #include "../nfs4trace.h" 25 #include "../iostat.h" 26 #include "../nfs.h" 27 #include "../nfs42.h" 28 29 #define NFSDBG_FACILITY NFSDBG_PNFS_LD 30 31 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ) 32 #define FF_LAYOUTRETURN_MAXERR 20 33 34 enum nfs4_ff_op_type { 35 NFS4_FF_OP_LAYOUTSTATS, 36 NFS4_FF_OP_LAYOUTRETURN, 37 }; 38 39 static unsigned short io_maxretrans; 40 41 static const struct pnfs_commit_ops ff_layout_commit_ops; 42 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 43 struct nfs_pgio_header *hdr); 44 static int 45 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 46 struct nfs42_layoutstat_devinfo *devinfo, 47 int dev_limit, enum nfs4_ff_op_type type); 48 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 49 const struct nfs42_layoutstat_devinfo *devinfo, 50 struct nfs4_ff_layout_ds_stripe *dss_info); 51 52 static struct pnfs_layout_hdr * 53 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) 54 { 55 struct nfs4_flexfile_layout *ffl; 56 57 ffl = kzalloc(sizeof(*ffl), gfp_flags); 58 if (ffl) { 59 pnfs_init_ds_commit_info(&ffl->commit_info); 60 INIT_LIST_HEAD(&ffl->error_list); 61 INIT_LIST_HEAD(&ffl->mirrors); 62 ffl->last_report_time = ktime_get(); 63 ffl->commit_info.ops = &ff_layout_commit_ops; 64 return &ffl->generic_hdr; 65 } else 66 return NULL; 67 } 68 69 static void 70 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo) 71 { 72 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo); 73 struct nfs4_ff_layout_ds_err *err, *n; 74 75 list_for_each_entry_safe(err, n, &ffl->error_list, list) { 76 list_del(&err->list); 77 kfree(err); 78 } 79 kfree_rcu(ffl, generic_hdr.plh_rcu); 80 } 81 82 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) 83 { 84 __be32 *p; 85 86 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE); 87 if (unlikely(p == NULL)) 88 return -ENOBUFS; 89 stateid->type = NFS4_PNFS_DS_STATEID_TYPE; 90 memcpy(stateid->data, p, NFS4_STATEID_SIZE); 91 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__, 92 p[0], p[1], p[2], p[3]); 93 return 0; 94 } 95 96 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid) 97 { 98 __be32 *p; 99 100 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE); 101 if (unlikely(!p)) 102 return -ENOBUFS; 103 memcpy(devid, p, NFS4_DEVICEID4_SIZE); 104 nfs4_print_deviceid(devid); 105 return 0; 106 } 107 108 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh) 109 { 110 __be32 *p; 111 112 p = xdr_inline_decode(xdr, 4); 113 if (unlikely(!p)) 114 return -ENOBUFS; 115 fh->size = be32_to_cpup(p++); 116 if (fh->size > NFS_MAXFHSIZE) { 117 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n", 118 fh->size); 119 return -EOVERFLOW; 120 } 121 /* fh.data */ 122 p = xdr_inline_decode(xdr, fh->size); 123 if (unlikely(!p)) 124 return -ENOBUFS; 125 memcpy(&fh->data, p, fh->size); 126 dprintk("%s: fh len %d\n", __func__, fh->size); 127 128 return 0; 129 } 130 131 /* 132 * Currently only stringified uids and gids are accepted. 133 * I.e., kerberos is not supported to the DSes, so no pricipals. 134 * 135 * That means that one common function will suffice, but when 136 * principals are added, this should be split to accomodate 137 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid(). 138 */ 139 static int 140 decode_name(struct xdr_stream *xdr, u32 *id) 141 { 142 __be32 *p; 143 int len; 144 145 /* opaque_length(4)*/ 146 p = xdr_inline_decode(xdr, 4); 147 if (unlikely(!p)) 148 return -ENOBUFS; 149 len = be32_to_cpup(p++); 150 if (len < 0) 151 return -EINVAL; 152 153 dprintk("%s: len %u\n", __func__, len); 154 155 /* opaque body */ 156 p = xdr_inline_decode(xdr, len); 157 if (unlikely(!p)) 158 return -ENOBUFS; 159 160 if (!nfs_map_string_to_numeric((char *)p, len, id)) 161 return -EINVAL; 162 163 return 0; 164 } 165 166 static struct nfsd_file * 167 ff_local_open_fh(struct pnfs_layout_segment *lseg, u32 ds_idx, u32 dss_id, 168 struct nfs_client *clp, const struct cred *cred, 169 struct nfs_fh *fh, fmode_t mode) 170 { 171 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 172 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); 173 174 return nfs_local_open_fh(clp, cred, fh, &mirror->dss[dss_id].nfl, mode); 175 #else 176 return NULL; 177 #endif 178 } 179 180 static bool ff_dss_match_fh(const struct nfs4_ff_layout_ds_stripe *dss1, 181 const struct nfs4_ff_layout_ds_stripe *dss2) 182 { 183 int i, j; 184 185 if (dss1->fh_versions_cnt != dss2->fh_versions_cnt) 186 return false; 187 188 for (i = 0; i < dss1->fh_versions_cnt; i++) { 189 bool found_fh = false; 190 for (j = 0; j < dss2->fh_versions_cnt; j++) { 191 if (nfs_compare_fh(&dss1->fh_versions[i], 192 &dss2->fh_versions[j]) == 0) { 193 found_fh = true; 194 break; 195 } 196 } 197 if (!found_fh) 198 return false; 199 } 200 return true; 201 } 202 203 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1, 204 const struct nfs4_ff_layout_mirror *m2) 205 { 206 u32 dss_id; 207 208 if (m1->dss_count != m2->dss_count) 209 return false; 210 211 for (dss_id = 0; dss_id < m1->dss_count; dss_id++) 212 if (!ff_dss_match_fh(&m1->dss[dss_id], &m2->dss[dss_id])) 213 return false; 214 215 return true; 216 } 217 218 static bool ff_mirror_match_devid(const struct nfs4_ff_layout_mirror *m1, 219 const struct nfs4_ff_layout_mirror *m2) 220 { 221 u32 dss_id; 222 223 if (m1->dss_count != m2->dss_count) 224 return false; 225 226 for (dss_id = 0; dss_id < m1->dss_count; dss_id++) 227 if (memcmp(&m1->dss[dss_id].devid, 228 &m2->dss[dss_id].devid, 229 sizeof(m1->dss[dss_id].devid)) != 0) 230 return false; 231 232 return true; 233 } 234 235 static struct nfs4_ff_layout_mirror * 236 ff_layout_add_mirror(struct pnfs_layout_hdr *lo, 237 struct nfs4_ff_layout_mirror *mirror) 238 { 239 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 240 struct nfs4_ff_layout_mirror *pos; 241 struct inode *inode = lo->plh_inode; 242 243 spin_lock(&inode->i_lock); 244 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) { 245 if (!ff_mirror_match_devid(mirror, pos)) 246 continue; 247 if (!ff_mirror_match_fh(mirror, pos)) 248 continue; 249 if (refcount_inc_not_zero(&pos->ref)) { 250 spin_unlock(&inode->i_lock); 251 return pos; 252 } 253 } 254 list_add(&mirror->mirrors, &ff_layout->mirrors); 255 mirror->layout = lo; 256 spin_unlock(&inode->i_lock); 257 return mirror; 258 } 259 260 static void 261 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror) 262 { 263 struct inode *inode; 264 if (mirror->layout == NULL) 265 return; 266 inode = mirror->layout->plh_inode; 267 spin_lock(&inode->i_lock); 268 list_del(&mirror->mirrors); 269 spin_unlock(&inode->i_lock); 270 mirror->layout = NULL; 271 } 272 273 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags) 274 { 275 struct nfs4_ff_layout_mirror *mirror; 276 u32 dss_id; 277 278 mirror = kzalloc(sizeof(*mirror), gfp_flags); 279 if (mirror != NULL) { 280 spin_lock_init(&mirror->lock); 281 refcount_set(&mirror->ref, 1); 282 INIT_LIST_HEAD(&mirror->mirrors); 283 for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) 284 nfs_localio_file_init(&mirror->dss[dss_id].nfl); 285 } 286 return mirror; 287 } 288 289 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror) 290 { 291 const struct cred *cred; 292 u32 dss_id; 293 294 ff_layout_remove_mirror(mirror); 295 296 for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) { 297 kfree(mirror->dss[dss_id].fh_versions); 298 cred = rcu_access_pointer(mirror->dss[dss_id].ro_cred); 299 put_cred(cred); 300 cred = rcu_access_pointer(mirror->dss[dss_id].rw_cred); 301 put_cred(cred); 302 nfs_close_local_fh(&mirror->dss[dss_id].nfl); 303 nfs4_ff_layout_put_deviceid(mirror->dss[dss_id].mirror_ds); 304 } 305 306 kfree(mirror->dss); 307 kfree(mirror); 308 } 309 310 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror) 311 { 312 if (mirror != NULL && refcount_dec_and_test(&mirror->ref)) 313 ff_layout_free_mirror(mirror); 314 } 315 316 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls) 317 { 318 u32 i; 319 320 for (i = 0; i < fls->mirror_array_cnt; i++) 321 ff_layout_put_mirror(fls->mirror_array[i]); 322 } 323 324 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls) 325 { 326 if (fls) { 327 ff_layout_free_mirror_array(fls); 328 kfree(fls); 329 } 330 } 331 332 static bool 333 ff_lseg_match_mirrors(struct pnfs_layout_segment *l1, 334 struct pnfs_layout_segment *l2) 335 { 336 const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1); 337 const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l2); 338 u32 i; 339 340 if (fl1->mirror_array_cnt != fl2->mirror_array_cnt) 341 return false; 342 for (i = 0; i < fl1->mirror_array_cnt; i++) { 343 if (fl1->mirror_array[i] != fl2->mirror_array[i]) 344 return false; 345 } 346 return true; 347 } 348 349 static bool 350 ff_lseg_range_is_after(const struct pnfs_layout_range *l1, 351 const struct pnfs_layout_range *l2) 352 { 353 u64 end1, end2; 354 355 if (l1->iomode != l2->iomode) 356 return l1->iomode != IOMODE_READ; 357 end1 = pnfs_calc_offset_end(l1->offset, l1->length); 358 end2 = pnfs_calc_offset_end(l2->offset, l2->length); 359 if (end1 < l2->offset) 360 return false; 361 if (end2 < l1->offset) 362 return true; 363 return l2->offset <= l1->offset; 364 } 365 366 static bool 367 ff_lseg_merge(struct pnfs_layout_segment *new, 368 struct pnfs_layout_segment *old) 369 { 370 u64 new_end, old_end; 371 372 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags)) 373 return false; 374 if (new->pls_range.iomode != old->pls_range.iomode) 375 return false; 376 old_end = pnfs_calc_offset_end(old->pls_range.offset, 377 old->pls_range.length); 378 if (old_end < new->pls_range.offset) 379 return false; 380 new_end = pnfs_calc_offset_end(new->pls_range.offset, 381 new->pls_range.length); 382 if (new_end < old->pls_range.offset) 383 return false; 384 if (!ff_lseg_match_mirrors(new, old)) 385 return false; 386 387 /* Mergeable: copy info from 'old' to 'new' */ 388 if (new_end < old_end) 389 new_end = old_end; 390 if (new->pls_range.offset < old->pls_range.offset) 391 new->pls_range.offset = old->pls_range.offset; 392 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset, 393 new_end); 394 if (test_bit(NFS_LSEG_ROC, &old->pls_flags)) 395 set_bit(NFS_LSEG_ROC, &new->pls_flags); 396 return true; 397 } 398 399 static void 400 ff_layout_add_lseg(struct pnfs_layout_hdr *lo, 401 struct pnfs_layout_segment *lseg, 402 struct list_head *free_me) 403 { 404 pnfs_generic_layout_insert_lseg(lo, lseg, 405 ff_lseg_range_is_after, 406 ff_lseg_merge, 407 free_me); 408 } 409 410 static u32 ff_mirror_efficiency_sum(const struct nfs4_ff_layout_mirror *mirror) 411 { 412 u32 dss_id, sum = 0; 413 414 for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) 415 sum += mirror->dss[dss_id].efficiency; 416 417 return sum; 418 } 419 420 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls) 421 { 422 int i, j; 423 424 for (i = 0; i < fls->mirror_array_cnt - 1; i++) { 425 for (j = i + 1; j < fls->mirror_array_cnt; j++) 426 if (ff_mirror_efficiency_sum(fls->mirror_array[i]) < 427 ff_mirror_efficiency_sum(fls->mirror_array[j])) 428 swap(fls->mirror_array[i], 429 fls->mirror_array[j]); 430 } 431 } 432 433 static struct pnfs_layout_segment * 434 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh, 435 struct nfs4_layoutget_res *lgr, 436 gfp_t gfp_flags) 437 { 438 struct pnfs_layout_segment *ret; 439 struct nfs4_ff_layout_segment *fls = NULL; 440 struct xdr_stream stream; 441 struct xdr_buf buf; 442 struct folio *scratch; 443 u64 stripe_unit; 444 u32 mirror_array_cnt; 445 __be32 *p; 446 int i, rc; 447 struct nfs4_ff_layout_ds_stripe *dss_info; 448 449 dprintk("--> %s\n", __func__); 450 scratch = folio_alloc(gfp_flags, 0); 451 if (!scratch) 452 return ERR_PTR(-ENOMEM); 453 454 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, 455 lgr->layoutp->len); 456 xdr_set_scratch_folio(&stream, scratch); 457 458 /* stripe unit and mirror_array_cnt */ 459 rc = -EIO; 460 p = xdr_inline_decode(&stream, 8 + 4); 461 if (!p) 462 goto out_err_free; 463 464 p = xdr_decode_hyper(p, &stripe_unit); 465 mirror_array_cnt = be32_to_cpup(p++); 466 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__, 467 stripe_unit, mirror_array_cnt); 468 469 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT || 470 mirror_array_cnt == 0) 471 goto out_err_free; 472 473 rc = -ENOMEM; 474 fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt), 475 gfp_flags); 476 if (!fls) 477 goto out_err_free; 478 479 fls->mirror_array_cnt = mirror_array_cnt; 480 fls->stripe_unit = stripe_unit; 481 482 u32 dss_count = 0; 483 for (i = 0; i < fls->mirror_array_cnt; i++) { 484 struct nfs4_ff_layout_mirror *mirror; 485 struct cred *kcred; 486 const struct cred __rcu *cred; 487 kuid_t uid; 488 kgid_t gid; 489 u32 fh_count, id; 490 int j, dss_id; 491 492 rc = -EIO; 493 p = xdr_inline_decode(&stream, 4); 494 if (!p) 495 goto out_err_free; 496 497 // Ensure all mirrors have same stripe count. 498 if (dss_count == 0) 499 dss_count = be32_to_cpup(p); 500 else if (dss_count != be32_to_cpup(p)) 501 goto out_err_free; 502 503 if (dss_count > NFS4_FLEXFILE_LAYOUT_MAX_STRIPE_CNT || 504 dss_count == 0) 505 goto out_err_free; 506 507 if (dss_count > 1 && stripe_unit == 0) 508 goto out_err_free; 509 510 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags); 511 if (fls->mirror_array[i] == NULL) { 512 rc = -ENOMEM; 513 goto out_err_free; 514 } 515 516 fls->mirror_array[i]->dss_count = dss_count; 517 fls->mirror_array[i]->dss = 518 kcalloc(dss_count, sizeof(struct nfs4_ff_layout_ds_stripe), 519 gfp_flags); 520 521 for (dss_id = 0; dss_id < dss_count; dss_id++) { 522 dss_info = &fls->mirror_array[i]->dss[dss_id]; 523 dss_info->mirror = fls->mirror_array[i]; 524 525 /* deviceid */ 526 rc = decode_deviceid(&stream, &dss_info->devid); 527 if (rc) 528 goto out_err_free; 529 530 /* efficiency */ 531 rc = -EIO; 532 p = xdr_inline_decode(&stream, 4); 533 if (!p) 534 goto out_err_free; 535 dss_info->efficiency = be32_to_cpup(p); 536 537 /* stateid */ 538 rc = decode_pnfs_stateid(&stream, &dss_info->stateid); 539 if (rc) 540 goto out_err_free; 541 542 /* fh */ 543 rc = -EIO; 544 p = xdr_inline_decode(&stream, 4); 545 if (!p) 546 goto out_err_free; 547 fh_count = be32_to_cpup(p); 548 549 dss_info->fh_versions = 550 kcalloc(fh_count, sizeof(struct nfs_fh), 551 gfp_flags); 552 if (dss_info->fh_versions == NULL) { 553 rc = -ENOMEM; 554 goto out_err_free; 555 } 556 557 for (j = 0; j < fh_count; j++) { 558 rc = decode_nfs_fh(&stream, 559 &dss_info->fh_versions[j]); 560 if (rc) 561 goto out_err_free; 562 } 563 564 dss_info->fh_versions_cnt = fh_count; 565 566 /* user */ 567 rc = decode_name(&stream, &id); 568 if (rc) 569 goto out_err_free; 570 571 uid = make_kuid(&init_user_ns, id); 572 573 /* group */ 574 rc = decode_name(&stream, &id); 575 if (rc) 576 goto out_err_free; 577 578 gid = make_kgid(&init_user_ns, id); 579 580 if (gfp_flags & __GFP_FS) 581 kcred = prepare_kernel_cred(&init_task); 582 else { 583 unsigned int nofs_flags = memalloc_nofs_save(); 584 585 kcred = prepare_kernel_cred(&init_task); 586 memalloc_nofs_restore(nofs_flags); 587 } 588 rc = -ENOMEM; 589 if (!kcred) 590 goto out_err_free; 591 kcred->fsuid = uid; 592 kcred->fsgid = gid; 593 cred = RCU_INITIALIZER(kcred); 594 595 if (lgr->range.iomode == IOMODE_READ) 596 rcu_assign_pointer(dss_info->ro_cred, cred); 597 else 598 rcu_assign_pointer(dss_info->rw_cred, cred); 599 } 600 601 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]); 602 if (mirror != fls->mirror_array[i]) { 603 for (dss_id = 0; dss_id < dss_count; dss_id++) { 604 dss_info = &fls->mirror_array[i]->dss[dss_id]; 605 /* swap cred ptrs so free_mirror will clean up old */ 606 if (lgr->range.iomode == IOMODE_READ) { 607 cred = xchg(&mirror->dss[dss_id].ro_cred, 608 dss_info->ro_cred); 609 rcu_assign_pointer(dss_info->ro_cred, cred); 610 } else { 611 cred = xchg(&mirror->dss[dss_id].rw_cred, 612 dss_info->rw_cred); 613 rcu_assign_pointer(dss_info->rw_cred, cred); 614 } 615 } 616 ff_layout_free_mirror(fls->mirror_array[i]); 617 fls->mirror_array[i] = mirror; 618 } 619 620 dprintk("%s: iomode %s uid %u gid %u\n", __func__, 621 lgr->range.iomode == IOMODE_READ ? "READ" : "RW", 622 from_kuid(&init_user_ns, uid), 623 from_kgid(&init_user_ns, gid)); 624 } 625 626 p = xdr_inline_decode(&stream, 4); 627 if (!p) 628 goto out_sort_mirrors; 629 fls->flags = be32_to_cpup(p); 630 631 p = xdr_inline_decode(&stream, 4); 632 if (!p) 633 goto out_sort_mirrors; 634 for (i=0; i < fls->mirror_array_cnt; i++) 635 fls->mirror_array[i]->report_interval = be32_to_cpup(p); 636 637 out_sort_mirrors: 638 ff_layout_sort_mirrors(fls); 639 ret = &fls->generic_hdr; 640 dprintk("<-- %s (success)\n", __func__); 641 out_free_page: 642 folio_put(scratch); 643 return ret; 644 out_err_free: 645 _ff_layout_free_lseg(fls); 646 ret = ERR_PTR(rc); 647 dprintk("<-- %s (%d)\n", __func__, rc); 648 goto out_free_page; 649 } 650 651 static void 652 ff_layout_free_lseg(struct pnfs_layout_segment *lseg) 653 { 654 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 655 656 dprintk("--> %s\n", __func__); 657 658 if (lseg->pls_range.iomode == IOMODE_RW) { 659 struct nfs4_flexfile_layout *ffl; 660 struct inode *inode; 661 662 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout); 663 inode = ffl->generic_hdr.plh_inode; 664 spin_lock(&inode->i_lock); 665 pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg); 666 spin_unlock(&inode->i_lock); 667 } 668 _ff_layout_free_lseg(fls); 669 } 670 671 static u32 calc_commit_idx(struct pnfs_layout_segment *lseg, 672 u32 mirror_idx, u32 dss_id) 673 { 674 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 675 676 return (mirror_idx * flseg->mirror_array[0]->dss_count) + dss_id; 677 } 678 679 static u32 calc_mirror_idx_from_commit(struct pnfs_layout_segment *lseg, 680 u32 commit_index) 681 { 682 return commit_index / FF_LAYOUT_LSEG(lseg)->mirror_array[0]->dss_count; 683 } 684 685 static u32 calc_dss_id_from_commit(struct pnfs_layout_segment *lseg, 686 u32 commit_index) 687 { 688 return commit_index % FF_LAYOUT_LSEG(lseg)->mirror_array[0]->dss_count; 689 } 690 691 static void 692 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 693 { 694 /* first IO request? */ 695 if (atomic_inc_return(&timer->n_ops) == 1) { 696 timer->start_time = now; 697 } 698 } 699 700 static ktime_t 701 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 702 { 703 ktime_t start; 704 705 if (atomic_dec_return(&timer->n_ops) < 0) 706 WARN_ON_ONCE(1); 707 708 start = timer->start_time; 709 timer->start_time = now; 710 return ktime_sub(now, start); 711 } 712 713 static bool 714 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 715 u32 dss_id, 716 struct nfs4_ff_layoutstat *layoutstat, 717 ktime_t now) 718 { 719 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL; 720 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout); 721 722 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now); 723 if (!mirror->dss[dss_id].start_time) 724 mirror->dss[dss_id].start_time = now; 725 if (mirror->report_interval != 0) 726 report_interval = (s64)mirror->report_interval * 1000LL; 727 else if (layoutstats_timer != 0) 728 report_interval = (s64)layoutstats_timer * 1000LL; 729 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >= 730 report_interval) { 731 ffl->last_report_time = now; 732 return true; 733 } 734 735 return false; 736 } 737 738 static void 739 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat, 740 __u64 requested) 741 { 742 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 743 744 iostat->ops_requested++; 745 iostat->bytes_requested += requested; 746 } 747 748 static void 749 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat, 750 __u64 requested, 751 __u64 completed, 752 ktime_t time_completed, 753 ktime_t time_started) 754 { 755 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 756 ktime_t completion_time = ktime_sub(time_completed, time_started); 757 ktime_t timer; 758 759 iostat->ops_completed++; 760 iostat->bytes_completed += completed; 761 iostat->bytes_not_delivered += requested - completed; 762 763 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed); 764 iostat->total_busy_time = 765 ktime_add(iostat->total_busy_time, timer); 766 iostat->aggregate_completion_time = 767 ktime_add(iostat->aggregate_completion_time, 768 completion_time); 769 } 770 771 static void 772 nfs4_ff_layout_stat_io_start_read(struct inode *inode, 773 struct nfs4_ff_layout_mirror *mirror, 774 u32 dss_id, 775 __u64 requested, ktime_t now) 776 { 777 bool report; 778 779 spin_lock(&mirror->lock); 780 report = nfs4_ff_layoutstat_start_io( 781 mirror, dss_id, &mirror->dss[dss_id].read_stat, now); 782 nfs4_ff_layout_stat_io_update_requested( 783 &mirror->dss[dss_id].read_stat, requested); 784 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 785 spin_unlock(&mirror->lock); 786 787 if (report) 788 pnfs_report_layoutstat(inode, nfs_io_gfp_mask()); 789 } 790 791 static void 792 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task, 793 struct nfs4_ff_layout_mirror *mirror, 794 u32 dss_id, 795 __u64 requested, 796 __u64 completed) 797 { 798 spin_lock(&mirror->lock); 799 nfs4_ff_layout_stat_io_update_completed(&mirror->dss[dss_id].read_stat, 800 requested, completed, 801 ktime_get(), task->tk_start); 802 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 803 spin_unlock(&mirror->lock); 804 } 805 806 static void 807 nfs4_ff_layout_stat_io_start_write(struct inode *inode, 808 struct nfs4_ff_layout_mirror *mirror, 809 u32 dss_id, 810 __u64 requested, ktime_t now) 811 { 812 bool report; 813 814 spin_lock(&mirror->lock); 815 report = nfs4_ff_layoutstat_start_io( 816 mirror, 817 dss_id, 818 &mirror->dss[dss_id].write_stat, 819 now); 820 nfs4_ff_layout_stat_io_update_requested( 821 &mirror->dss[dss_id].write_stat, 822 requested); 823 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 824 spin_unlock(&mirror->lock); 825 826 if (report) 827 pnfs_report_layoutstat(inode, nfs_io_gfp_mask()); 828 } 829 830 static void 831 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, 832 struct nfs4_ff_layout_mirror *mirror, 833 u32 dss_id, 834 __u64 requested, 835 __u64 completed, 836 enum nfs3_stable_how committed) 837 { 838 if (committed == NFS_UNSTABLE) 839 requested = completed = 0; 840 841 spin_lock(&mirror->lock); 842 nfs4_ff_layout_stat_io_update_completed(&mirror->dss[dss_id].write_stat, 843 requested, completed, ktime_get(), task->tk_start); 844 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 845 spin_unlock(&mirror->lock); 846 } 847 848 static void 849 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx, u32 dss_id) 850 { 851 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id); 852 853 if (devid) 854 nfs4_mark_deviceid_unavailable(devid); 855 } 856 857 static void 858 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx, u32 dss_id) 859 { 860 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id); 861 862 if (devid) 863 nfs4_mark_deviceid_available(devid); 864 } 865 866 static struct nfs4_pnfs_ds * 867 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, 868 u32 start_idx, u32 *best_idx, 869 u32 offset, u32 *dss_id, 870 bool check_device) 871 { 872 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 873 struct nfs4_ff_layout_mirror *mirror; 874 struct nfs4_pnfs_ds *ds = ERR_PTR(-EAGAIN); 875 u32 idx; 876 877 /* mirrors are initially sorted by efficiency */ 878 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 879 mirror = FF_LAYOUT_COMP(lseg, idx); 880 *dss_id = nfs4_ff_layout_calc_dss_id( 881 fls->stripe_unit, 882 fls->mirror_array[idx]->dss_count, 883 offset); 884 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, *dss_id, false); 885 if (IS_ERR(ds)) 886 continue; 887 888 if (check_device && 889 nfs4_test_deviceid_unavailable(&mirror->dss[*dss_id].mirror_ds->id_node)) { 890 // reinitialize the error state in case if this is the last iteration 891 ds = ERR_PTR(-EINVAL); 892 continue; 893 } 894 895 *best_idx = idx; 896 break; 897 } 898 899 return ds; 900 } 901 902 static struct nfs4_pnfs_ds * 903 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg, 904 u32 start_idx, u32 *best_idx, 905 u32 offset, u32 *dss_id) 906 { 907 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, 908 offset, dss_id, false); 909 } 910 911 static struct nfs4_pnfs_ds * 912 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg, 913 u32 start_idx, u32 *best_idx, 914 u32 offset, u32 *dss_id) 915 { 916 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, 917 offset, dss_id, true); 918 } 919 920 static struct nfs4_pnfs_ds * 921 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 922 u32 start_idx, u32 *best_idx, 923 u32 offset, u32 *dss_id) 924 { 925 struct nfs4_pnfs_ds *ds; 926 927 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx, 928 offset, dss_id); 929 if (!IS_ERR(ds)) 930 return ds; 931 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx, 932 offset, dss_id); 933 } 934 935 static struct nfs4_pnfs_ds * 936 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio, 937 u32 *best_idx, 938 u32 offset, 939 u32 *dss_id) 940 { 941 struct pnfs_layout_segment *lseg = pgio->pg_lseg; 942 struct nfs4_pnfs_ds *ds; 943 944 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx, 945 best_idx, offset, dss_id); 946 if (!IS_ERR(ds) || !pgio->pg_mirror_idx) 947 return ds; 948 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx, 949 offset, dss_id); 950 } 951 952 static void 953 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio, 954 struct nfs_page *req, 955 bool strict_iomode) 956 { 957 pnfs_put_lseg(pgio->pg_lseg); 958 pgio->pg_lseg = 959 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 960 req_offset(req), req->wb_bytes, IOMODE_READ, 961 strict_iomode, nfs_io_gfp_mask()); 962 if (IS_ERR(pgio->pg_lseg)) { 963 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 964 pgio->pg_lseg = NULL; 965 } 966 } 967 968 static bool 969 ff_layout_lseg_is_striped(const struct nfs4_ff_layout_segment *fls) 970 { 971 return fls->mirror_array[0]->dss_count > 1; 972 } 973 974 /* 975 * ff_layout_pg_test(). Called by nfs_can_coalesce_requests() 976 * 977 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 978 * of bytes (maximum @req->wb_bytes) that can be coalesced. 979 */ 980 static size_t 981 ff_layout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 982 struct nfs_page *req) 983 { 984 unsigned int size; 985 u64 p_stripe, r_stripe; 986 u32 stripe_offset; 987 u64 segment_offset = pgio->pg_lseg->pls_range.offset; 988 u32 stripe_unit = FF_LAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; 989 990 /* calls nfs_generic_pg_test */ 991 size = pnfs_generic_pg_test(pgio, prev, req); 992 if (!size) 993 return 0; 994 else if (!ff_layout_lseg_is_striped(FF_LAYOUT_LSEG(pgio->pg_lseg))) 995 return size; 996 997 /* see if req and prev are in the same stripe */ 998 if (prev) { 999 p_stripe = (u64)req_offset(prev) - segment_offset; 1000 r_stripe = (u64)req_offset(req) - segment_offset; 1001 do_div(p_stripe, stripe_unit); 1002 do_div(r_stripe, stripe_unit); 1003 1004 if (p_stripe != r_stripe) 1005 return 0; 1006 } 1007 1008 /* calculate remaining bytes in the current stripe */ 1009 div_u64_rem((u64)req_offset(req) - segment_offset, 1010 stripe_unit, 1011 &stripe_offset); 1012 WARN_ON_ONCE(stripe_offset > stripe_unit); 1013 if (stripe_offset >= stripe_unit) 1014 return 0; 1015 return min(stripe_unit - (unsigned int)stripe_offset, size); 1016 } 1017 1018 static void 1019 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 1020 struct nfs_page *req) 1021 { 1022 struct nfs_pgio_mirror *pgm; 1023 struct nfs4_ff_layout_mirror *mirror; 1024 struct nfs4_pnfs_ds *ds; 1025 u32 ds_idx, dss_id; 1026 1027 if (NFS_SERVER(pgio->pg_inode)->flags & 1028 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 1029 pgio->pg_maxretrans = io_maxretrans; 1030 retry: 1031 pnfs_generic_pg_check_layout(pgio, req); 1032 /* Use full layout for now */ 1033 if (!pgio->pg_lseg) { 1034 ff_layout_pg_get_read(pgio, req, false); 1035 if (!pgio->pg_lseg) 1036 goto out_nolseg; 1037 } 1038 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 1039 ff_layout_pg_get_read(pgio, req, true); 1040 if (!pgio->pg_lseg) 1041 goto out_nolseg; 1042 } 1043 /* Reset wb_nio, since getting layout segment was successful */ 1044 req->wb_nio = 0; 1045 1046 ds = ff_layout_get_ds_for_read(pgio, &ds_idx, 1047 req_offset(req), &dss_id); 1048 if (IS_ERR(ds)) { 1049 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 1050 goto out_mds; 1051 pnfs_generic_pg_cleanup(pgio); 1052 /* Sleep for 1 second before retrying */ 1053 ssleep(1); 1054 goto retry; 1055 } 1056 1057 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 1058 pgm = &pgio->pg_mirrors[0]; 1059 pgm->pg_bsize = mirror->dss[dss_id].mirror_ds->ds_versions[0].rsize; 1060 1061 pgio->pg_mirror_idx = ds_idx; 1062 return; 1063 out_nolseg: 1064 if (pgio->pg_error < 0) { 1065 if (pgio->pg_error != -EAGAIN) 1066 return; 1067 /* Retry getting layout segment if lower layer returned -EAGAIN */ 1068 if (pgio->pg_maxretrans && req->wb_nio++ > pgio->pg_maxretrans) { 1069 if (NFS_SERVER(pgio->pg_inode)->flags & NFS_MOUNT_SOFTERR) 1070 pgio->pg_error = -ETIMEDOUT; 1071 else 1072 pgio->pg_error = -EIO; 1073 return; 1074 } 1075 pgio->pg_error = 0; 1076 /* Sleep for 1 second before retrying */ 1077 ssleep(1); 1078 goto retry; 1079 } 1080 out_mds: 1081 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode, 1082 0, NFS4_MAX_UINT64, IOMODE_READ, 1083 NFS_I(pgio->pg_inode)->layout, 1084 pgio->pg_lseg); 1085 pgio->pg_maxretrans = 0; 1086 nfs_pageio_reset_read_mds(pgio); 1087 } 1088 1089 static void 1090 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 1091 struct nfs_page *req) 1092 { 1093 struct nfs4_ff_layout_mirror *mirror; 1094 struct nfs_pgio_mirror *pgm; 1095 struct nfs4_pnfs_ds *ds; 1096 u32 i, dss_id; 1097 1098 retry: 1099 pnfs_generic_pg_check_layout(pgio, req); 1100 if (!pgio->pg_lseg) { 1101 pgio->pg_lseg = 1102 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 1103 req_offset(req), req->wb_bytes, 1104 IOMODE_RW, false, nfs_io_gfp_mask()); 1105 if (IS_ERR(pgio->pg_lseg)) { 1106 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 1107 pgio->pg_lseg = NULL; 1108 return; 1109 } 1110 } 1111 /* If no lseg, fall back to write through mds */ 1112 if (pgio->pg_lseg == NULL) 1113 goto out_mds; 1114 1115 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 1116 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)) 1117 goto out_eagain; 1118 1119 for (i = 0; i < pgio->pg_mirror_count; i++) { 1120 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 1121 dss_id = nfs4_ff_layout_calc_dss_id( 1122 FF_LAYOUT_LSEG(pgio->pg_lseg)->stripe_unit, 1123 mirror->dss_count, 1124 req_offset(req)); 1125 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, 1126 dss_id, true); 1127 if (IS_ERR(ds)) { 1128 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 1129 goto out_mds; 1130 pnfs_generic_pg_cleanup(pgio); 1131 /* Sleep for 1 second before retrying */ 1132 ssleep(1); 1133 goto retry; 1134 } 1135 pgm = &pgio->pg_mirrors[i]; 1136 pgm->pg_bsize = mirror->dss[dss_id].mirror_ds->ds_versions[0].wsize; 1137 } 1138 1139 if (NFS_SERVER(pgio->pg_inode)->flags & 1140 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 1141 pgio->pg_maxretrans = io_maxretrans; 1142 return; 1143 out_eagain: 1144 pnfs_generic_pg_cleanup(pgio); 1145 pgio->pg_error = -EAGAIN; 1146 return; 1147 out_mds: 1148 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode, 1149 0, NFS4_MAX_UINT64, IOMODE_RW, 1150 NFS_I(pgio->pg_inode)->layout, 1151 pgio->pg_lseg); 1152 pgio->pg_maxretrans = 0; 1153 nfs_pageio_reset_write_mds(pgio); 1154 pgio->pg_error = -EAGAIN; 1155 } 1156 1157 static unsigned int 1158 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 1159 struct nfs_page *req) 1160 { 1161 if (!pgio->pg_lseg) { 1162 pgio->pg_lseg = 1163 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 1164 req_offset(req), req->wb_bytes, 1165 IOMODE_RW, false, nfs_io_gfp_mask()); 1166 if (IS_ERR(pgio->pg_lseg)) { 1167 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 1168 pgio->pg_lseg = NULL; 1169 goto out; 1170 } 1171 } 1172 if (pgio->pg_lseg) 1173 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 1174 1175 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode, 1176 0, NFS4_MAX_UINT64, IOMODE_RW, 1177 NFS_I(pgio->pg_inode)->layout, 1178 pgio->pg_lseg); 1179 /* no lseg means that pnfs is not in use, so no mirroring here */ 1180 nfs_pageio_reset_write_mds(pgio); 1181 out: 1182 return 1; 1183 } 1184 1185 static u32 1186 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 1187 { 1188 u32 old = desc->pg_mirror_idx; 1189 1190 desc->pg_mirror_idx = idx; 1191 return old; 1192 } 1193 1194 static struct nfs_pgio_mirror * 1195 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 1196 { 1197 return &desc->pg_mirrors[idx]; 1198 } 1199 1200 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 1201 .pg_init = ff_layout_pg_init_read, 1202 .pg_test = ff_layout_pg_test, 1203 .pg_doio = pnfs_generic_pg_readpages, 1204 .pg_cleanup = pnfs_generic_pg_cleanup, 1205 }; 1206 1207 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 1208 .pg_init = ff_layout_pg_init_write, 1209 .pg_test = ff_layout_pg_test, 1210 .pg_doio = pnfs_generic_pg_writepages, 1211 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 1212 .pg_cleanup = pnfs_generic_pg_cleanup, 1213 .pg_get_mirror = ff_layout_pg_get_mirror_write, 1214 .pg_set_mirror = ff_layout_pg_set_mirror_write, 1215 }; 1216 1217 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 1218 { 1219 struct rpc_task *task = &hdr->task; 1220 1221 pnfs_layoutcommit_inode(hdr->inode, false); 1222 1223 if (retry_pnfs) { 1224 dprintk("%s Reset task %5u for i/o through pNFS " 1225 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1226 hdr->task.tk_pid, 1227 hdr->inode->i_sb->s_id, 1228 (unsigned long long)NFS_FILEID(hdr->inode), 1229 hdr->args.count, 1230 (unsigned long long)hdr->args.offset); 1231 1232 hdr->completion_ops->reschedule_io(hdr); 1233 return; 1234 } 1235 1236 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1237 dprintk("%s Reset task %5u for i/o through MDS " 1238 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1239 hdr->task.tk_pid, 1240 hdr->inode->i_sb->s_id, 1241 (unsigned long long)NFS_FILEID(hdr->inode), 1242 hdr->args.count, 1243 (unsigned long long)hdr->args.offset); 1244 1245 trace_pnfs_mds_fallback_write_done(hdr->inode, 1246 hdr->args.offset, hdr->args.count, 1247 IOMODE_RW, NFS_I(hdr->inode)->layout, 1248 hdr->lseg); 1249 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1250 } 1251 } 1252 1253 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr) 1254 { 1255 u32 idx = hdr->pgio_mirror_idx + 1; 1256 u32 new_idx = 0; 1257 u32 dss_id = 0; 1258 struct nfs4_pnfs_ds *ds; 1259 1260 ds = ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx, 1261 hdr->args.offset, &dss_id); 1262 if (IS_ERR(ds)) 1263 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1264 else 1265 ff_layout_send_layouterror(hdr->lseg); 1266 pnfs_read_resend_pnfs(hdr, new_idx); 1267 } 1268 1269 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1270 { 1271 struct rpc_task *task = &hdr->task; 1272 1273 pnfs_layoutcommit_inode(hdr->inode, false); 1274 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1275 1276 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1277 dprintk("%s Reset task %5u for i/o through MDS " 1278 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1279 hdr->task.tk_pid, 1280 hdr->inode->i_sb->s_id, 1281 (unsigned long long)NFS_FILEID(hdr->inode), 1282 hdr->args.count, 1283 (unsigned long long)hdr->args.offset); 1284 1285 trace_pnfs_mds_fallback_read_done(hdr->inode, 1286 hdr->args.offset, hdr->args.count, 1287 IOMODE_READ, NFS_I(hdr->inode)->layout, 1288 hdr->lseg); 1289 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1290 } 1291 } 1292 1293 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1294 u32 op_status, 1295 struct nfs4_state *state, 1296 struct nfs_client *clp, 1297 struct pnfs_layout_segment *lseg, 1298 u32 idx, u32 dss_id) 1299 { 1300 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1301 struct inode *inode = lo->plh_inode; 1302 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id); 1303 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1304 1305 switch (op_status) { 1306 case NFS4_OK: 1307 case NFS4ERR_NXIO: 1308 break; 1309 case NFSERR_PERM: 1310 if (!task->tk_xprt) 1311 break; 1312 xprt_force_disconnect(task->tk_xprt); 1313 goto out_retry; 1314 case NFS4ERR_BADSESSION: 1315 case NFS4ERR_BADSLOT: 1316 case NFS4ERR_BAD_HIGH_SLOT: 1317 case NFS4ERR_DEADSESSION: 1318 case NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1319 case NFS4ERR_SEQ_FALSE_RETRY: 1320 case NFS4ERR_SEQ_MISORDERED: 1321 dprintk("%s ERROR %d, Reset session. Exchangeid " 1322 "flags 0x%x\n", __func__, task->tk_status, 1323 clp->cl_exchange_flags); 1324 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1325 goto out_retry; 1326 case NFS4ERR_DELAY: 1327 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1328 fallthrough; 1329 case NFS4ERR_GRACE: 1330 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1331 goto out_retry; 1332 case NFS4ERR_RETRY_UNCACHED_REP: 1333 goto out_retry; 1334 /* Invalidate Layout errors */ 1335 case NFS4ERR_PNFS_NO_LAYOUT: 1336 case NFS4ERR_STALE: 1337 case NFS4ERR_BADHANDLE: 1338 case NFS4ERR_ISDIR: 1339 case NFS4ERR_FHEXPIRED: 1340 case NFS4ERR_WRONG_TYPE: 1341 dprintk("%s Invalid layout error %d\n", __func__, 1342 task->tk_status); 1343 /* 1344 * Destroy layout so new i/o will get a new layout. 1345 * Layout will not be destroyed until all current lseg 1346 * references are put. Mark layout as invalid to resend failed 1347 * i/o and all i/o waiting on the slot table to the MDS until 1348 * layout is destroyed and a new valid layout is obtained. 1349 */ 1350 pnfs_destroy_layout(NFS_I(inode)); 1351 rpc_wake_up(&tbl->slot_tbl_waitq); 1352 goto reset; 1353 default: 1354 break; 1355 } 1356 1357 switch (task->tk_status) { 1358 /* RPC connection errors */ 1359 case -ENETDOWN: 1360 case -ENETUNREACH: 1361 if (test_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags)) 1362 return -NFS4ERR_FATAL_IOERROR; 1363 fallthrough; 1364 case -ECONNREFUSED: 1365 case -EHOSTDOWN: 1366 case -EHOSTUNREACH: 1367 case -EIO: 1368 case -ETIMEDOUT: 1369 case -EPIPE: 1370 case -EPROTO: 1371 case -ENODEV: 1372 dprintk("%s DS connection error %d\n", __func__, 1373 task->tk_status); 1374 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1375 &devid->deviceid); 1376 rpc_wake_up(&tbl->slot_tbl_waitq); 1377 break; 1378 default: 1379 break; 1380 } 1381 1382 if (ff_layout_avoid_mds_available_ds(lseg)) 1383 return -NFS4ERR_RESET_TO_PNFS; 1384 reset: 1385 dprintk("%s Retry through MDS. Error %d\n", __func__, 1386 task->tk_status); 1387 return -NFS4ERR_RESET_TO_MDS; 1388 1389 out_retry: 1390 task->tk_status = 0; 1391 return -EAGAIN; 1392 } 1393 1394 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1395 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1396 u32 op_status, 1397 struct nfs_client *clp, 1398 struct pnfs_layout_segment *lseg, 1399 u32 idx, u32 dss_id) 1400 { 1401 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id); 1402 1403 switch (op_status) { 1404 case NFS_OK: 1405 case NFSERR_NXIO: 1406 break; 1407 case NFSERR_PERM: 1408 if (!task->tk_xprt) 1409 break; 1410 xprt_force_disconnect(task->tk_xprt); 1411 goto out_retry; 1412 case NFSERR_ACCES: 1413 case NFSERR_BADHANDLE: 1414 case NFSERR_FBIG: 1415 case NFSERR_IO: 1416 case NFSERR_NOSPC: 1417 case NFSERR_ROFS: 1418 case NFSERR_STALE: 1419 goto out_reset_to_pnfs; 1420 case NFSERR_JUKEBOX: 1421 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1422 goto out_retry; 1423 default: 1424 break; 1425 } 1426 1427 switch (task->tk_status) { 1428 /* File access problems. Don't mark the device as unavailable */ 1429 case -EACCES: 1430 case -ESTALE: 1431 case -EISDIR: 1432 case -EBADHANDLE: 1433 case -ELOOP: 1434 case -ENOSPC: 1435 break; 1436 case -EJUKEBOX: 1437 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1438 goto out_retry; 1439 case -ENETDOWN: 1440 case -ENETUNREACH: 1441 if (test_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags)) 1442 return -NFS4ERR_FATAL_IOERROR; 1443 fallthrough; 1444 default: 1445 dprintk("%s DS connection error %d\n", __func__, 1446 task->tk_status); 1447 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1448 &devid->deviceid); 1449 } 1450 out_reset_to_pnfs: 1451 /* FIXME: Need to prevent infinite looping here. */ 1452 return -NFS4ERR_RESET_TO_PNFS; 1453 out_retry: 1454 task->tk_status = 0; 1455 rpc_restart_call_prepare(task); 1456 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1457 return -EAGAIN; 1458 } 1459 1460 static int ff_layout_async_handle_error(struct rpc_task *task, 1461 u32 op_status, 1462 struct nfs4_state *state, 1463 struct nfs_client *clp, 1464 struct pnfs_layout_segment *lseg, 1465 u32 idx, u32 dss_id) 1466 { 1467 int vers = clp->cl_nfs_mod->rpc_vers->number; 1468 1469 if (task->tk_status >= 0) { 1470 ff_layout_mark_ds_reachable(lseg, idx, dss_id); 1471 return 0; 1472 } 1473 1474 /* Handle the case of an invalid layout segment */ 1475 if (!pnfs_is_valid_lseg(lseg)) 1476 return -NFS4ERR_RESET_TO_PNFS; 1477 1478 switch (vers) { 1479 case 3: 1480 return ff_layout_async_handle_error_v3(task, op_status, clp, 1481 lseg, idx, dss_id); 1482 case 4: 1483 return ff_layout_async_handle_error_v4(task, op_status, state, 1484 clp, lseg, idx, dss_id); 1485 default: 1486 /* should never happen */ 1487 WARN_ON_ONCE(1); 1488 return 0; 1489 } 1490 } 1491 1492 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1493 u32 idx, u32 dss_id, u64 offset, u64 length, 1494 u32 *op_status, int opnum, int error) 1495 { 1496 struct nfs4_ff_layout_mirror *mirror; 1497 u32 status = *op_status; 1498 int err; 1499 1500 if (status == 0) { 1501 switch (error) { 1502 case -ETIMEDOUT: 1503 case -EPFNOSUPPORT: 1504 case -EPROTONOSUPPORT: 1505 case -EOPNOTSUPP: 1506 case -EINVAL: 1507 case -ECONNREFUSED: 1508 case -ECONNRESET: 1509 case -EHOSTDOWN: 1510 case -EHOSTUNREACH: 1511 case -ENETDOWN: 1512 case -ENETUNREACH: 1513 case -EADDRINUSE: 1514 case -ENOBUFS: 1515 case -EPIPE: 1516 case -EPERM: 1517 case -EPROTO: 1518 case -ENODEV: 1519 *op_status = status = NFS4ERR_NXIO; 1520 break; 1521 case -EACCES: 1522 *op_status = status = NFS4ERR_ACCESS; 1523 break; 1524 default: 1525 return; 1526 } 1527 } 1528 1529 mirror = FF_LAYOUT_COMP(lseg, idx); 1530 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1531 mirror, dss_id, offset, length, status, opnum, 1532 nfs_io_gfp_mask()); 1533 1534 switch (status) { 1535 case NFS4ERR_DELAY: 1536 case NFS4ERR_GRACE: 1537 case NFS4ERR_PERM: 1538 break; 1539 case NFS4ERR_NXIO: 1540 ff_layout_mark_ds_unreachable(lseg, idx, dss_id); 1541 /* 1542 * Don't return the layout if this is a read and we still 1543 * have layouts to try 1544 */ 1545 if (opnum == OP_READ) 1546 break; 1547 fallthrough; 1548 default: 1549 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, 1550 lseg); 1551 } 1552 1553 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1554 } 1555 1556 /* NFS_PROTO call done callback routines */ 1557 static int ff_layout_read_done_cb(struct rpc_task *task, 1558 struct nfs_pgio_header *hdr) 1559 { 1560 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(hdr->lseg); 1561 u32 dss_id = nfs4_ff_layout_calc_dss_id( 1562 flseg->stripe_unit, 1563 flseg->mirror_array[hdr->pgio_mirror_idx]->dss_count, 1564 hdr->args.offset); 1565 int err; 1566 1567 if (task->tk_status < 0) { 1568 ff_layout_io_track_ds_error(hdr->lseg, 1569 hdr->pgio_mirror_idx, dss_id, 1570 hdr->args.offset, hdr->args.count, 1571 &hdr->res.op_status, OP_READ, 1572 task->tk_status); 1573 trace_ff_layout_read_error(hdr, task->tk_status); 1574 } 1575 1576 err = ff_layout_async_handle_error(task, hdr->res.op_status, 1577 hdr->args.context->state, 1578 hdr->ds_clp, hdr->lseg, 1579 hdr->pgio_mirror_idx, 1580 dss_id); 1581 1582 trace_nfs4_pnfs_read(hdr, err); 1583 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1584 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1585 switch (err) { 1586 case -NFS4ERR_RESET_TO_PNFS: 1587 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1588 return task->tk_status; 1589 case -NFS4ERR_RESET_TO_MDS: 1590 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1591 return task->tk_status; 1592 case -EAGAIN: 1593 goto out_eagain; 1594 case -NFS4ERR_FATAL_IOERROR: 1595 task->tk_status = -EIO; 1596 return 0; 1597 } 1598 1599 return 0; 1600 out_eagain: 1601 rpc_restart_call_prepare(task); 1602 return -EAGAIN; 1603 } 1604 1605 static bool 1606 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1607 { 1608 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1609 } 1610 1611 /* 1612 * We reference the rpc_cred of the first WRITE that triggers the need for 1613 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1614 * rfc5661 is not clear about which credential should be used. 1615 * 1616 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1617 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1618 * we always send layoutcommit after DS writes. 1619 */ 1620 static void 1621 ff_layout_set_layoutcommit(struct inode *inode, 1622 struct pnfs_layout_segment *lseg, 1623 loff_t end_offset) 1624 { 1625 if (!ff_layout_need_layoutcommit(lseg)) 1626 return; 1627 1628 pnfs_set_layoutcommit(inode, lseg, end_offset); 1629 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1630 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1631 } 1632 1633 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1634 struct nfs_pgio_header *hdr) 1635 { 1636 struct nfs4_ff_layout_mirror *mirror; 1637 u32 dss_id; 1638 1639 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1640 return; 1641 1642 mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx); 1643 dss_id = nfs4_ff_layout_calc_dss_id( 1644 FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit, 1645 mirror->dss_count, 1646 hdr->args.offset); 1647 1648 nfs4_ff_layout_stat_io_start_read( 1649 hdr->inode, 1650 mirror, 1651 dss_id, 1652 hdr->args.count, 1653 task->tk_start); 1654 } 1655 1656 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1657 struct nfs_pgio_header *hdr) 1658 { 1659 struct nfs4_ff_layout_mirror *mirror; 1660 u32 dss_id; 1661 1662 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1663 return; 1664 1665 mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx); 1666 dss_id = nfs4_ff_layout_calc_dss_id( 1667 FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit, 1668 mirror->dss_count, 1669 hdr->args.offset); 1670 1671 nfs4_ff_layout_stat_io_end_read( 1672 task, 1673 mirror, 1674 dss_id, 1675 hdr->args.count, 1676 hdr->res.count); 1677 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1678 } 1679 1680 static int ff_layout_read_prepare_common(struct rpc_task *task, 1681 struct nfs_pgio_header *hdr) 1682 { 1683 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1684 rpc_exit(task, -EIO); 1685 return -EIO; 1686 } 1687 1688 if (!pnfs_is_valid_lseg(hdr->lseg)) { 1689 rpc_exit(task, -EAGAIN); 1690 return -EAGAIN; 1691 } 1692 1693 ff_layout_read_record_layoutstats_start(task, hdr); 1694 return 0; 1695 } 1696 1697 /* 1698 * Call ops for the async read/write cases 1699 * In the case of dense layouts, the offset needs to be reset to its 1700 * original value. 1701 */ 1702 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1703 { 1704 struct nfs_pgio_header *hdr = data; 1705 1706 if (ff_layout_read_prepare_common(task, hdr)) 1707 return; 1708 1709 rpc_call_start(task); 1710 } 1711 1712 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1713 { 1714 struct nfs_pgio_header *hdr = data; 1715 1716 if (nfs4_setup_sequence(hdr->ds_clp, 1717 &hdr->args.seq_args, 1718 &hdr->res.seq_res, 1719 task)) 1720 return; 1721 1722 ff_layout_read_prepare_common(task, hdr); 1723 } 1724 1725 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1726 { 1727 struct nfs_pgio_header *hdr = data; 1728 1729 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1730 task->tk_status == 0) { 1731 nfs4_sequence_done(task, &hdr->res.seq_res); 1732 return; 1733 } 1734 1735 /* Note this may cause RPC to be resent */ 1736 hdr->mds_ops->rpc_call_done(task, hdr); 1737 } 1738 1739 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1740 { 1741 struct nfs_pgio_header *hdr = data; 1742 1743 ff_layout_read_record_layoutstats_done(task, hdr); 1744 rpc_count_iostats_metrics(task, 1745 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1746 } 1747 1748 static void ff_layout_read_release(void *data) 1749 { 1750 struct nfs_pgio_header *hdr = data; 1751 1752 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1753 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) 1754 ff_layout_resend_pnfs_read(hdr); 1755 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1756 ff_layout_reset_read(hdr); 1757 pnfs_generic_rw_release(data); 1758 } 1759 1760 1761 static int ff_layout_write_done_cb(struct rpc_task *task, 1762 struct nfs_pgio_header *hdr) 1763 { 1764 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(hdr->lseg); 1765 u32 dss_id = nfs4_ff_layout_calc_dss_id( 1766 flseg->stripe_unit, 1767 flseg->mirror_array[hdr->pgio_mirror_idx]->dss_count, 1768 hdr->args.offset); 1769 loff_t end_offs = 0; 1770 int err; 1771 1772 if (task->tk_status < 0) { 1773 ff_layout_io_track_ds_error(hdr->lseg, 1774 hdr->pgio_mirror_idx, dss_id, 1775 hdr->args.offset, hdr->args.count, 1776 &hdr->res.op_status, OP_WRITE, 1777 task->tk_status); 1778 trace_ff_layout_write_error(hdr, task->tk_status); 1779 } 1780 1781 err = ff_layout_async_handle_error(task, hdr->res.op_status, 1782 hdr->args.context->state, 1783 hdr->ds_clp, hdr->lseg, 1784 hdr->pgio_mirror_idx, 1785 dss_id); 1786 1787 trace_nfs4_pnfs_write(hdr, err); 1788 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1789 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1790 switch (err) { 1791 case -NFS4ERR_RESET_TO_PNFS: 1792 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1793 return task->tk_status; 1794 case -NFS4ERR_RESET_TO_MDS: 1795 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1796 return task->tk_status; 1797 case -EAGAIN: 1798 return -EAGAIN; 1799 case -NFS4ERR_FATAL_IOERROR: 1800 task->tk_status = -EIO; 1801 return 0; 1802 } 1803 1804 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1805 hdr->res.verf->committed == NFS_DATA_SYNC) 1806 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1807 1808 /* Note: if the write is unstable, don't set end_offs until commit */ 1809 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1810 1811 /* zero out fattr since we don't care DS attr at all */ 1812 hdr->fattr.valid = 0; 1813 if (task->tk_status >= 0) 1814 nfs_writeback_update_inode(hdr); 1815 1816 return 0; 1817 } 1818 1819 static int ff_layout_commit_done_cb(struct rpc_task *task, 1820 struct nfs_commit_data *data) 1821 { 1822 int err; 1823 u32 idx = calc_mirror_idx_from_commit(data->lseg, data->ds_commit_index); 1824 u32 dss_id = calc_dss_id_from_commit(data->lseg, data->ds_commit_index); 1825 1826 if (task->tk_status < 0) { 1827 ff_layout_io_track_ds_error(data->lseg, idx, dss_id, 1828 data->args.offset, data->args.count, 1829 &data->res.op_status, OP_COMMIT, 1830 task->tk_status); 1831 trace_ff_layout_commit_error(data, task->tk_status); 1832 } 1833 1834 err = ff_layout_async_handle_error(task, data->res.op_status, 1835 NULL, data->ds_clp, data->lseg, idx, 1836 dss_id); 1837 1838 trace_nfs4_pnfs_commit_ds(data, err); 1839 switch (err) { 1840 case -NFS4ERR_RESET_TO_PNFS: 1841 pnfs_generic_prepare_to_resend_writes(data); 1842 return -EAGAIN; 1843 case -NFS4ERR_RESET_TO_MDS: 1844 pnfs_generic_prepare_to_resend_writes(data); 1845 return -EAGAIN; 1846 case -EAGAIN: 1847 rpc_restart_call_prepare(task); 1848 return -EAGAIN; 1849 case -NFS4ERR_FATAL_IOERROR: 1850 task->tk_status = -EIO; 1851 return 0; 1852 } 1853 1854 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1855 return 0; 1856 } 1857 1858 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1859 struct nfs_pgio_header *hdr) 1860 { 1861 struct nfs4_ff_layout_mirror *mirror; 1862 u32 dss_id; 1863 1864 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1865 return; 1866 1867 mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx); 1868 dss_id = nfs4_ff_layout_calc_dss_id( 1869 FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit, 1870 mirror->dss_count, 1871 hdr->args.offset); 1872 1873 nfs4_ff_layout_stat_io_start_write( 1874 hdr->inode, 1875 mirror, 1876 dss_id, 1877 hdr->args.count, 1878 task->tk_start); 1879 } 1880 1881 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1882 struct nfs_pgio_header *hdr) 1883 { 1884 struct nfs4_ff_layout_mirror *mirror; 1885 u32 dss_id; 1886 1887 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1888 return; 1889 1890 mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx); 1891 dss_id = nfs4_ff_layout_calc_dss_id( 1892 FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit, 1893 mirror->dss_count, 1894 hdr->args.offset); 1895 1896 nfs4_ff_layout_stat_io_end_write( 1897 task, 1898 mirror, 1899 dss_id, 1900 hdr->args.count, 1901 hdr->res.count, 1902 hdr->res.verf->committed); 1903 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1904 } 1905 1906 static int ff_layout_write_prepare_common(struct rpc_task *task, 1907 struct nfs_pgio_header *hdr) 1908 { 1909 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1910 rpc_exit(task, -EIO); 1911 return -EIO; 1912 } 1913 1914 if (!pnfs_is_valid_lseg(hdr->lseg)) { 1915 rpc_exit(task, -EAGAIN); 1916 return -EAGAIN; 1917 } 1918 1919 ff_layout_write_record_layoutstats_start(task, hdr); 1920 return 0; 1921 } 1922 1923 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1924 { 1925 struct nfs_pgio_header *hdr = data; 1926 1927 if (ff_layout_write_prepare_common(task, hdr)) 1928 return; 1929 1930 rpc_call_start(task); 1931 } 1932 1933 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1934 { 1935 struct nfs_pgio_header *hdr = data; 1936 1937 if (nfs4_setup_sequence(hdr->ds_clp, 1938 &hdr->args.seq_args, 1939 &hdr->res.seq_res, 1940 task)) 1941 return; 1942 1943 ff_layout_write_prepare_common(task, hdr); 1944 } 1945 1946 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1947 { 1948 struct nfs_pgio_header *hdr = data; 1949 1950 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1951 task->tk_status == 0) { 1952 nfs4_sequence_done(task, &hdr->res.seq_res); 1953 return; 1954 } 1955 1956 /* Note this may cause RPC to be resent */ 1957 hdr->mds_ops->rpc_call_done(task, hdr); 1958 } 1959 1960 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1961 { 1962 struct nfs_pgio_header *hdr = data; 1963 1964 ff_layout_write_record_layoutstats_done(task, hdr); 1965 rpc_count_iostats_metrics(task, 1966 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1967 } 1968 1969 static void ff_layout_write_release(void *data) 1970 { 1971 struct nfs_pgio_header *hdr = data; 1972 1973 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1974 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1975 ff_layout_send_layouterror(hdr->lseg); 1976 ff_layout_reset_write(hdr, true); 1977 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1978 ff_layout_reset_write(hdr, false); 1979 pnfs_generic_rw_release(data); 1980 } 1981 1982 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1983 struct nfs_commit_data *cdata) 1984 { 1985 u32 idx, dss_id; 1986 1987 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1988 return; 1989 1990 idx = calc_mirror_idx_from_commit(cdata->lseg, cdata->ds_commit_index); 1991 dss_id = calc_dss_id_from_commit(cdata->lseg, cdata->ds_commit_index); 1992 nfs4_ff_layout_stat_io_start_write(cdata->inode, 1993 FF_LAYOUT_COMP(cdata->lseg, idx), 1994 dss_id, 1995 0, task->tk_start); 1996 } 1997 1998 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 1999 struct nfs_commit_data *cdata) 2000 { 2001 struct nfs_page *req; 2002 __u64 count = 0; 2003 u32 idx, dss_id; 2004 2005 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 2006 return; 2007 2008 if (task->tk_status == 0) { 2009 list_for_each_entry(req, &cdata->pages, wb_list) 2010 count += req->wb_bytes; 2011 } 2012 2013 idx = calc_mirror_idx_from_commit(cdata->lseg, cdata->ds_commit_index); 2014 dss_id = calc_dss_id_from_commit(cdata->lseg, cdata->ds_commit_index); 2015 nfs4_ff_layout_stat_io_end_write(task, 2016 FF_LAYOUT_COMP(cdata->lseg, idx), 2017 dss_id, 2018 count, count, NFS_FILE_SYNC); 2019 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 2020 } 2021 2022 static int ff_layout_commit_prepare_common(struct rpc_task *task, 2023 struct nfs_commit_data *cdata) 2024 { 2025 if (!pnfs_is_valid_lseg(cdata->lseg)) { 2026 rpc_exit(task, -EAGAIN); 2027 return -EAGAIN; 2028 } 2029 2030 ff_layout_commit_record_layoutstats_start(task, cdata); 2031 return 0; 2032 } 2033 2034 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 2035 { 2036 if (ff_layout_commit_prepare_common(task, data)) 2037 return; 2038 2039 rpc_call_start(task); 2040 } 2041 2042 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 2043 { 2044 struct nfs_commit_data *wdata = data; 2045 2046 if (nfs4_setup_sequence(wdata->ds_clp, 2047 &wdata->args.seq_args, 2048 &wdata->res.seq_res, 2049 task)) 2050 return; 2051 ff_layout_commit_prepare_common(task, data); 2052 } 2053 2054 static void ff_layout_commit_done(struct rpc_task *task, void *data) 2055 { 2056 pnfs_generic_write_commit_done(task, data); 2057 } 2058 2059 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 2060 { 2061 struct nfs_commit_data *cdata = data; 2062 2063 ff_layout_commit_record_layoutstats_done(task, cdata); 2064 rpc_count_iostats_metrics(task, 2065 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 2066 } 2067 2068 static void ff_layout_commit_release(void *data) 2069 { 2070 struct nfs_commit_data *cdata = data; 2071 2072 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 2073 pnfs_generic_commit_release(data); 2074 } 2075 2076 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 2077 .rpc_call_prepare = ff_layout_read_prepare_v3, 2078 .rpc_call_done = ff_layout_read_call_done, 2079 .rpc_count_stats = ff_layout_read_count_stats, 2080 .rpc_release = ff_layout_read_release, 2081 }; 2082 2083 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = { 2084 .rpc_call_prepare = ff_layout_read_prepare_v4, 2085 .rpc_call_done = ff_layout_read_call_done, 2086 .rpc_count_stats = ff_layout_read_count_stats, 2087 .rpc_release = ff_layout_read_release, 2088 }; 2089 2090 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 2091 .rpc_call_prepare = ff_layout_write_prepare_v3, 2092 .rpc_call_done = ff_layout_write_call_done, 2093 .rpc_count_stats = ff_layout_write_count_stats, 2094 .rpc_release = ff_layout_write_release, 2095 }; 2096 2097 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = { 2098 .rpc_call_prepare = ff_layout_write_prepare_v4, 2099 .rpc_call_done = ff_layout_write_call_done, 2100 .rpc_count_stats = ff_layout_write_count_stats, 2101 .rpc_release = ff_layout_write_release, 2102 }; 2103 2104 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 2105 .rpc_call_prepare = ff_layout_commit_prepare_v3, 2106 .rpc_call_done = ff_layout_commit_done, 2107 .rpc_count_stats = ff_layout_commit_count_stats, 2108 .rpc_release = ff_layout_commit_release, 2109 }; 2110 2111 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 2112 .rpc_call_prepare = ff_layout_commit_prepare_v4, 2113 .rpc_call_done = ff_layout_commit_done, 2114 .rpc_count_stats = ff_layout_commit_count_stats, 2115 .rpc_release = ff_layout_commit_release, 2116 }; 2117 2118 static enum pnfs_try_status 2119 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 2120 { 2121 struct pnfs_layout_segment *lseg = hdr->lseg; 2122 struct nfs4_pnfs_ds *ds; 2123 struct rpc_clnt *ds_clnt; 2124 struct nfsd_file *localio; 2125 struct nfs4_ff_layout_mirror *mirror; 2126 const struct cred *ds_cred; 2127 loff_t offset = hdr->args.offset; 2128 u32 idx = hdr->pgio_mirror_idx; 2129 int vers; 2130 struct nfs_fh *fh; 2131 u32 dss_id; 2132 bool ds_fatal_error = false; 2133 2134 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 2135 __func__, hdr->inode->i_ino, 2136 hdr->args.pgbase, (size_t)hdr->args.count, offset); 2137 2138 mirror = FF_LAYOUT_COMP(lseg, idx); 2139 dss_id = nfs4_ff_layout_calc_dss_id( 2140 FF_LAYOUT_LSEG(lseg)->stripe_unit, 2141 mirror->dss_count, 2142 offset); 2143 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, dss_id, false); 2144 if (IS_ERR(ds)) { 2145 ds_fatal_error = nfs_error_is_fatal(PTR_ERR(ds)); 2146 goto out_failed; 2147 } 2148 2149 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 2150 hdr->inode, dss_id); 2151 if (IS_ERR(ds_clnt)) 2152 goto out_failed; 2153 2154 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred, dss_id); 2155 if (!ds_cred) 2156 goto out_failed; 2157 2158 vers = nfs4_ff_layout_ds_version(mirror, dss_id); 2159 2160 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 2161 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 2162 2163 hdr->pgio_done_cb = ff_layout_read_done_cb; 2164 refcount_inc(&ds->ds_clp->cl_count); 2165 hdr->ds_clp = ds->ds_clp; 2166 fh = nfs4_ff_layout_select_ds_fh(mirror, dss_id); 2167 if (fh) 2168 hdr->args.fh = fh; 2169 2170 nfs4_ff_layout_select_ds_stateid(mirror, dss_id, &hdr->args.stateid); 2171 2172 /* 2173 * Note that if we ever decide to split across DSes, 2174 * then we may need to handle dense-like offsets. 2175 */ 2176 hdr->args.offset = offset; 2177 hdr->mds_offset = offset; 2178 2179 /* Start IO accounting for local read */ 2180 localio = ff_local_open_fh(lseg, idx, dss_id, ds->ds_clp, ds_cred, fh, 2181 FMODE_READ); 2182 if (localio) { 2183 hdr->task.tk_start = ktime_get(); 2184 ff_layout_read_record_layoutstats_start(&hdr->task, hdr); 2185 } 2186 2187 /* Perform an asynchronous read to ds */ 2188 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 2189 vers == 3 ? &ff_layout_read_call_ops_v3 : 2190 &ff_layout_read_call_ops_v4, 2191 0, RPC_TASK_SOFTCONN, localio); 2192 put_cred(ds_cred); 2193 return PNFS_ATTEMPTED; 2194 2195 out_failed: 2196 if (ff_layout_avoid_mds_available_ds(lseg) && !ds_fatal_error) 2197 return PNFS_TRY_AGAIN; 2198 trace_pnfs_mds_fallback_read_pagelist(hdr->inode, 2199 hdr->args.offset, hdr->args.count, 2200 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg); 2201 return PNFS_NOT_ATTEMPTED; 2202 } 2203 2204 /* Perform async writes. */ 2205 static enum pnfs_try_status 2206 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 2207 { 2208 struct pnfs_layout_segment *lseg = hdr->lseg; 2209 struct nfs4_pnfs_ds *ds; 2210 struct rpc_clnt *ds_clnt; 2211 struct nfsd_file *localio; 2212 struct nfs4_ff_layout_mirror *mirror; 2213 const struct cred *ds_cred; 2214 loff_t offset = hdr->args.offset; 2215 int vers; 2216 struct nfs_fh *fh; 2217 u32 idx = hdr->pgio_mirror_idx; 2218 u32 dss_id; 2219 bool ds_fatal_error = false; 2220 2221 mirror = FF_LAYOUT_COMP(lseg, idx); 2222 dss_id = nfs4_ff_layout_calc_dss_id( 2223 FF_LAYOUT_LSEG(lseg)->stripe_unit, 2224 mirror->dss_count, 2225 offset); 2226 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, dss_id, true); 2227 if (IS_ERR(ds)) { 2228 ds_fatal_error = nfs_error_is_fatal(PTR_ERR(ds)); 2229 goto out_failed; 2230 } 2231 2232 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 2233 hdr->inode, dss_id); 2234 if (IS_ERR(ds_clnt)) 2235 goto out_failed; 2236 2237 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred, dss_id); 2238 if (!ds_cred) 2239 goto out_failed; 2240 2241 vers = nfs4_ff_layout_ds_version(mirror, dss_id); 2242 2243 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 2244 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 2245 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 2246 vers); 2247 2248 hdr->pgio_done_cb = ff_layout_write_done_cb; 2249 refcount_inc(&ds->ds_clp->cl_count); 2250 hdr->ds_clp = ds->ds_clp; 2251 hdr->ds_commit_idx = calc_commit_idx(lseg, idx, dss_id); 2252 fh = nfs4_ff_layout_select_ds_fh(mirror, dss_id); 2253 if (fh) 2254 hdr->args.fh = fh; 2255 2256 nfs4_ff_layout_select_ds_stateid(mirror, dss_id, &hdr->args.stateid); 2257 2258 /* 2259 * Note that if we ever decide to split across DSes, 2260 * then we may need to handle dense-like offsets. 2261 */ 2262 hdr->args.offset = offset; 2263 2264 /* Start IO accounting for local write */ 2265 localio = ff_local_open_fh(lseg, idx, dss_id, ds->ds_clp, ds_cred, fh, 2266 FMODE_READ|FMODE_WRITE); 2267 if (localio) { 2268 hdr->task.tk_start = ktime_get(); 2269 ff_layout_write_record_layoutstats_start(&hdr->task, hdr); 2270 } 2271 2272 /* Perform an asynchronous write */ 2273 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 2274 vers == 3 ? &ff_layout_write_call_ops_v3 : 2275 &ff_layout_write_call_ops_v4, 2276 sync, RPC_TASK_SOFTCONN, localio); 2277 put_cred(ds_cred); 2278 return PNFS_ATTEMPTED; 2279 2280 out_failed: 2281 if (ff_layout_avoid_mds_available_ds(lseg) && !ds_fatal_error) 2282 return PNFS_TRY_AGAIN; 2283 trace_pnfs_mds_fallback_write_pagelist(hdr->inode, 2284 hdr->args.offset, hdr->args.count, 2285 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg); 2286 return PNFS_NOT_ATTEMPTED; 2287 } 2288 2289 static struct nfs_fh * 2290 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i, u32 dss_id) 2291 { 2292 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 2293 2294 /* FIXME: Assume that there is only one NFS version available 2295 * for the DS. 2296 */ 2297 return &flseg->mirror_array[i]->dss[dss_id].fh_versions[0]; 2298 } 2299 2300 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 2301 { 2302 struct pnfs_layout_segment *lseg = data->lseg; 2303 struct nfs4_pnfs_ds *ds; 2304 struct rpc_clnt *ds_clnt; 2305 struct nfsd_file *localio; 2306 struct nfs4_ff_layout_mirror *mirror; 2307 const struct cred *ds_cred; 2308 u32 idx, dss_id; 2309 int vers, ret; 2310 struct nfs_fh *fh; 2311 2312 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 2313 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 2314 goto out_err; 2315 2316 idx = calc_mirror_idx_from_commit(lseg, data->ds_commit_index); 2317 mirror = FF_LAYOUT_COMP(lseg, idx); 2318 dss_id = calc_dss_id_from_commit(lseg, data->ds_commit_index); 2319 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, dss_id, true); 2320 if (IS_ERR(ds)) 2321 goto out_err; 2322 2323 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 2324 data->inode, dss_id); 2325 if (IS_ERR(ds_clnt)) 2326 goto out_err; 2327 2328 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred, dss_id); 2329 if (!ds_cred) 2330 goto out_err; 2331 2332 vers = nfs4_ff_layout_ds_version(mirror, dss_id); 2333 2334 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 2335 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 2336 vers); 2337 data->commit_done_cb = ff_layout_commit_done_cb; 2338 data->cred = ds_cred; 2339 refcount_inc(&ds->ds_clp->cl_count); 2340 data->ds_clp = ds->ds_clp; 2341 fh = select_ds_fh_from_commit(lseg, idx, dss_id); 2342 if (fh) 2343 data->args.fh = fh; 2344 2345 /* Start IO accounting for local commit */ 2346 localio = ff_local_open_fh(lseg, idx, dss_id, ds->ds_clp, ds_cred, fh, 2347 FMODE_READ|FMODE_WRITE); 2348 if (localio) { 2349 data->task.tk_start = ktime_get(); 2350 ff_layout_commit_record_layoutstats_start(&data->task, data); 2351 } 2352 2353 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 2354 vers == 3 ? &ff_layout_commit_call_ops_v3 : 2355 &ff_layout_commit_call_ops_v4, 2356 how, RPC_TASK_SOFTCONN, localio); 2357 put_cred(ds_cred); 2358 return ret; 2359 out_err: 2360 pnfs_generic_prepare_to_resend_writes(data); 2361 pnfs_generic_commit_release(data); 2362 return -EAGAIN; 2363 } 2364 2365 static int 2366 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 2367 int how, struct nfs_commit_info *cinfo) 2368 { 2369 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 2370 ff_layout_initiate_commit); 2371 } 2372 2373 static bool ff_layout_match_rw(const struct rpc_task *task, 2374 const struct nfs_pgio_header *hdr, 2375 const struct pnfs_layout_segment *lseg) 2376 { 2377 return hdr->lseg == lseg; 2378 } 2379 2380 static bool ff_layout_match_commit(const struct rpc_task *task, 2381 const struct nfs_commit_data *cdata, 2382 const struct pnfs_layout_segment *lseg) 2383 { 2384 return cdata->lseg == lseg; 2385 } 2386 2387 static bool ff_layout_match_io(const struct rpc_task *task, const void *data) 2388 { 2389 const struct rpc_call_ops *ops = task->tk_ops; 2390 2391 if (ops == &ff_layout_read_call_ops_v3 || 2392 ops == &ff_layout_read_call_ops_v4 || 2393 ops == &ff_layout_write_call_ops_v3 || 2394 ops == &ff_layout_write_call_ops_v4) 2395 return ff_layout_match_rw(task, task->tk_calldata, data); 2396 if (ops == &ff_layout_commit_call_ops_v3 || 2397 ops == &ff_layout_commit_call_ops_v4) 2398 return ff_layout_match_commit(task, task->tk_calldata, data); 2399 return false; 2400 } 2401 2402 static void ff_layout_cancel_io(struct pnfs_layout_segment *lseg) 2403 { 2404 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 2405 struct nfs4_ff_layout_mirror *mirror; 2406 struct nfs4_ff_layout_ds *mirror_ds; 2407 struct nfs4_pnfs_ds *ds; 2408 struct nfs_client *ds_clp; 2409 struct rpc_clnt *clnt; 2410 u32 idx, dss_id; 2411 2412 for (idx = 0; idx < flseg->mirror_array_cnt; idx++) { 2413 mirror = flseg->mirror_array[idx]; 2414 for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) { 2415 mirror_ds = mirror->dss[dss_id].mirror_ds; 2416 if (IS_ERR_OR_NULL(mirror_ds)) 2417 continue; 2418 ds = mirror->dss[dss_id].mirror_ds->ds; 2419 if (!ds) 2420 continue; 2421 ds_clp = ds->ds_clp; 2422 if (!ds_clp) 2423 continue; 2424 clnt = ds_clp->cl_rpcclient; 2425 if (!clnt) 2426 continue; 2427 if (!rpc_cancel_tasks(clnt, -EAGAIN, 2428 ff_layout_match_io, lseg)) 2429 continue; 2430 rpc_clnt_disconnect(clnt); 2431 } 2432 } 2433 } 2434 2435 static struct pnfs_ds_commit_info * 2436 ff_layout_get_ds_info(struct inode *inode) 2437 { 2438 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 2439 2440 if (layout == NULL) 2441 return NULL; 2442 2443 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 2444 } 2445 2446 static void 2447 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 2448 struct pnfs_layout_segment *lseg) 2449 { 2450 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 2451 struct inode *inode = lseg->pls_layout->plh_inode; 2452 struct pnfs_commit_array *array, *new; 2453 u32 size = flseg->mirror_array_cnt * flseg->mirror_array[0]->dss_count; 2454 2455 new = pnfs_alloc_commit_array(size, 2456 nfs_io_gfp_mask()); 2457 if (new) { 2458 spin_lock(&inode->i_lock); 2459 array = pnfs_add_commit_array(fl_cinfo, new, lseg); 2460 spin_unlock(&inode->i_lock); 2461 if (array != new) 2462 pnfs_free_commit_array(new); 2463 } 2464 } 2465 2466 static void 2467 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 2468 struct inode *inode) 2469 { 2470 spin_lock(&inode->i_lock); 2471 pnfs_generic_ds_cinfo_destroy(fl_cinfo); 2472 spin_unlock(&inode->i_lock); 2473 } 2474 2475 static void 2476 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 2477 { 2478 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 2479 id_node)); 2480 } 2481 2482 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 2483 const struct nfs4_layoutreturn_args *args, 2484 const struct nfs4_flexfile_layoutreturn_args *ff_args) 2485 { 2486 __be32 *start; 2487 2488 start = xdr_reserve_space(xdr, 4); 2489 if (unlikely(!start)) 2490 return -E2BIG; 2491 2492 *start = cpu_to_be32(ff_args->num_errors); 2493 /* This assume we always return _ALL_ layouts */ 2494 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 2495 } 2496 2497 static void 2498 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 2499 const nfs4_stateid *stateid, 2500 const struct nfs42_layoutstat_devinfo *devinfo) 2501 { 2502 __be32 *p; 2503 2504 p = xdr_reserve_space(xdr, 8 + 8); 2505 p = xdr_encode_hyper(p, devinfo->offset); 2506 p = xdr_encode_hyper(p, devinfo->length); 2507 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 2508 p = xdr_reserve_space(xdr, 4*8); 2509 p = xdr_encode_hyper(p, devinfo->read_count); 2510 p = xdr_encode_hyper(p, devinfo->read_bytes); 2511 p = xdr_encode_hyper(p, devinfo->write_count); 2512 p = xdr_encode_hyper(p, devinfo->write_bytes); 2513 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 2514 } 2515 2516 static void 2517 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 2518 const nfs4_stateid *stateid, 2519 const struct nfs42_layoutstat_devinfo *devinfo) 2520 { 2521 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 2522 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 2523 devinfo->ld_private.data); 2524 } 2525 2526 /* report nothing for now */ 2527 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 2528 const struct nfs4_layoutreturn_args *args, 2529 struct nfs4_flexfile_layoutreturn_args *ff_args) 2530 { 2531 __be32 *p; 2532 int i; 2533 2534 p = xdr_reserve_space(xdr, 4); 2535 *p = cpu_to_be32(ff_args->num_dev); 2536 for (i = 0; i < ff_args->num_dev; i++) 2537 ff_layout_encode_ff_iostat(xdr, 2538 &args->layout->plh_stateid, 2539 &ff_args->devinfo[i]); 2540 } 2541 2542 static void 2543 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 2544 unsigned int num_entries) 2545 { 2546 unsigned int i; 2547 2548 for (i = 0; i < num_entries; i++) { 2549 if (!devinfo[i].ld_private.ops) 2550 continue; 2551 if (!devinfo[i].ld_private.ops->free) 2552 continue; 2553 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 2554 } 2555 } 2556 2557 static struct nfs4_deviceid_node * 2558 ff_layout_alloc_deviceid_node(struct nfs_server *server, 2559 struct pnfs_device *pdev, gfp_t gfp_flags) 2560 { 2561 struct nfs4_ff_layout_ds *dsaddr; 2562 2563 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2564 if (!dsaddr) 2565 return NULL; 2566 return &dsaddr->id_node; 2567 } 2568 2569 static void 2570 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2571 const void *voidargs, 2572 const struct nfs4_xdr_opaque_data *ff_opaque) 2573 { 2574 const struct nfs4_layoutreturn_args *args = voidargs; 2575 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2576 struct xdr_buf tmp_buf = { 2577 .head = { 2578 [0] = { 2579 .iov_base = page_address(ff_args->pages[0]), 2580 }, 2581 }, 2582 .buflen = PAGE_SIZE, 2583 }; 2584 struct xdr_stream tmp_xdr; 2585 __be32 *start; 2586 2587 dprintk("%s: Begin\n", __func__); 2588 2589 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL); 2590 2591 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2592 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2593 2594 start = xdr_reserve_space(xdr, 4); 2595 *start = cpu_to_be32(tmp_buf.len); 2596 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2597 2598 dprintk("%s: Return\n", __func__); 2599 } 2600 2601 static void 2602 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2603 { 2604 struct nfs4_flexfile_layoutreturn_args *ff_args; 2605 2606 if (!args->data) 2607 return; 2608 ff_args = args->data; 2609 args->data = NULL; 2610 2611 ff_layout_free_ds_ioerr(&ff_args->errors); 2612 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2613 2614 put_page(ff_args->pages[0]); 2615 kfree(ff_args); 2616 } 2617 2618 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2619 .encode = ff_layout_encode_layoutreturn, 2620 .free = ff_layout_free_layoutreturn, 2621 }; 2622 2623 static int 2624 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2625 { 2626 struct nfs4_flexfile_layoutreturn_args *ff_args; 2627 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2628 2629 ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask()); 2630 if (!ff_args) 2631 goto out_nomem; 2632 ff_args->pages[0] = alloc_page(nfs_io_gfp_mask()); 2633 if (!ff_args->pages[0]) 2634 goto out_nomem_free; 2635 2636 INIT_LIST_HEAD(&ff_args->errors); 2637 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2638 &args->range, &ff_args->errors, 2639 FF_LAYOUTRETURN_MAXERR); 2640 2641 spin_lock(&args->inode->i_lock); 2642 ff_args->num_dev = ff_layout_mirror_prepare_stats( 2643 &ff_layout->generic_hdr, &ff_args->devinfo[0], 2644 ARRAY_SIZE(ff_args->devinfo), NFS4_FF_OP_LAYOUTRETURN); 2645 spin_unlock(&args->inode->i_lock); 2646 2647 args->ld_private->ops = &layoutreturn_ops; 2648 args->ld_private->data = ff_args; 2649 return 0; 2650 out_nomem_free: 2651 kfree(ff_args); 2652 out_nomem: 2653 return -ENOMEM; 2654 } 2655 2656 #ifdef CONFIG_NFS_V4_2 2657 void 2658 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2659 { 2660 struct pnfs_layout_hdr *lo = lseg->pls_layout; 2661 struct nfs42_layout_error *errors; 2662 LIST_HEAD(head); 2663 2664 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) 2665 return; 2666 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); 2667 if (list_empty(&head)) 2668 return; 2669 2670 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors), 2671 nfs_io_gfp_mask()); 2672 if (errors != NULL) { 2673 const struct nfs4_ff_layout_ds_err *pos; 2674 size_t n = 0; 2675 2676 list_for_each_entry(pos, &head, list) { 2677 errors[n].offset = pos->offset; 2678 errors[n].length = pos->length; 2679 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); 2680 errors[n].errors[0].dev_id = pos->deviceid; 2681 errors[n].errors[0].status = pos->status; 2682 errors[n].errors[0].opnum = pos->opnum; 2683 n++; 2684 if (!list_is_last(&pos->list, &head) && 2685 n < NFS42_LAYOUTERROR_MAX) 2686 continue; 2687 if (nfs42_proc_layouterror(lseg, errors, n) < 0) 2688 break; 2689 n = 0; 2690 } 2691 kfree(errors); 2692 } 2693 ff_layout_free_ds_ioerr(&head); 2694 } 2695 #else 2696 void 2697 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2698 { 2699 } 2700 #endif 2701 2702 static int 2703 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2704 { 2705 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2706 2707 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2708 } 2709 2710 static size_t 2711 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2712 const int buflen) 2713 { 2714 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2715 const struct in6_addr *addr = &sin6->sin6_addr; 2716 2717 /* 2718 * RFC 4291, Section 2.2.2 2719 * 2720 * Shorthanded ANY address 2721 */ 2722 if (ipv6_addr_any(addr)) 2723 return snprintf(buf, buflen, "::"); 2724 2725 /* 2726 * RFC 4291, Section 2.2.2 2727 * 2728 * Shorthanded loopback address 2729 */ 2730 if (ipv6_addr_loopback(addr)) 2731 return snprintf(buf, buflen, "::1"); 2732 2733 /* 2734 * RFC 4291, Section 2.2.3 2735 * 2736 * Special presentation address format for mapped v4 2737 * addresses. 2738 */ 2739 if (ipv6_addr_v4mapped(addr)) 2740 return snprintf(buf, buflen, "::ffff:%pI4", 2741 &addr->s6_addr32[3]); 2742 2743 /* 2744 * RFC 4291, Section 2.2.1 2745 */ 2746 return snprintf(buf, buflen, "%pI6c", addr); 2747 } 2748 2749 /* Derived from rpc_sockaddr2uaddr */ 2750 static void 2751 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2752 { 2753 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2754 char portbuf[RPCBIND_MAXUADDRPLEN]; 2755 char addrbuf[RPCBIND_MAXUADDRLEN]; 2756 unsigned short port; 2757 int len, netid_len; 2758 __be32 *p; 2759 2760 switch (sap->sa_family) { 2761 case AF_INET: 2762 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2763 return; 2764 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2765 break; 2766 case AF_INET6: 2767 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2768 return; 2769 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2770 break; 2771 default: 2772 WARN_ON_ONCE(1); 2773 return; 2774 } 2775 2776 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2777 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2778 2779 netid_len = strlen(da->da_netid); 2780 p = xdr_reserve_space(xdr, 4 + netid_len); 2781 xdr_encode_opaque(p, da->da_netid, netid_len); 2782 2783 p = xdr_reserve_space(xdr, 4 + len); 2784 xdr_encode_opaque(p, addrbuf, len); 2785 } 2786 2787 static void 2788 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2789 ktime_t t) 2790 { 2791 struct timespec64 ts; 2792 __be32 *p; 2793 2794 p = xdr_reserve_space(xdr, 12); 2795 ts = ktime_to_timespec64(t); 2796 p = xdr_encode_hyper(p, ts.tv_sec); 2797 *p++ = cpu_to_be32(ts.tv_nsec); 2798 } 2799 2800 static void 2801 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2802 struct nfs4_ff_io_stat *stat) 2803 { 2804 __be32 *p; 2805 2806 p = xdr_reserve_space(xdr, 5 * 8); 2807 p = xdr_encode_hyper(p, stat->ops_requested); 2808 p = xdr_encode_hyper(p, stat->bytes_requested); 2809 p = xdr_encode_hyper(p, stat->ops_completed); 2810 p = xdr_encode_hyper(p, stat->bytes_completed); 2811 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2812 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2813 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2814 } 2815 2816 static void 2817 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2818 const struct nfs42_layoutstat_devinfo *devinfo, 2819 struct nfs4_ff_layout_ds_stripe *dss_info) 2820 { 2821 struct nfs4_pnfs_ds_addr *da; 2822 struct nfs4_pnfs_ds *ds = dss_info->mirror_ds->ds; 2823 struct nfs_fh *fh = &dss_info->fh_versions[0]; 2824 __be32 *p; 2825 2826 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2827 dprintk("%s: DS %s: encoding address %s\n", 2828 __func__, ds->ds_remotestr, da->da_remotestr); 2829 /* netaddr4 */ 2830 ff_layout_encode_netaddr(xdr, da); 2831 /* nfs_fh4 */ 2832 p = xdr_reserve_space(xdr, 4 + fh->size); 2833 xdr_encode_opaque(p, fh->data, fh->size); 2834 /* ff_io_latency4 read */ 2835 spin_lock(&dss_info->mirror->lock); 2836 ff_layout_encode_io_latency(xdr, 2837 &dss_info->read_stat.io_stat); 2838 /* ff_io_latency4 write */ 2839 ff_layout_encode_io_latency(xdr, 2840 &dss_info->write_stat.io_stat); 2841 spin_unlock(&dss_info->mirror->lock); 2842 /* nfstime4 */ 2843 ff_layout_encode_nfstime(xdr, 2844 ktime_sub(ktime_get(), 2845 dss_info->start_time)); 2846 /* bool */ 2847 p = xdr_reserve_space(xdr, 4); 2848 *p = cpu_to_be32(false); 2849 } 2850 2851 static void 2852 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2853 const struct nfs4_xdr_opaque_data *opaque) 2854 { 2855 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2856 struct nfs42_layoutstat_devinfo, ld_private); 2857 __be32 *start; 2858 2859 /* layoutupdate length */ 2860 start = xdr_reserve_space(xdr, 4); 2861 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2862 2863 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2864 } 2865 2866 static void 2867 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2868 { 2869 struct nfs4_ff_layout_ds_stripe *dss_info = opaque->data; 2870 struct nfs4_ff_layout_mirror *mirror = dss_info->mirror; 2871 2872 ff_layout_put_mirror(mirror); 2873 } 2874 2875 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2876 .encode = ff_layout_encode_layoutstats, 2877 .free = ff_layout_free_layoutstats, 2878 }; 2879 2880 static int 2881 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2882 struct nfs42_layoutstat_devinfo *devinfo, 2883 int dev_limit, enum nfs4_ff_op_type type) 2884 { 2885 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2886 struct nfs4_ff_layout_mirror *mirror; 2887 struct nfs4_ff_layout_ds_stripe *dss_info; 2888 struct nfs4_deviceid_node *dev; 2889 int i = 0, dss_id; 2890 2891 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2892 for (dss_id = 0; dss_id < mirror->dss_count; ++dss_id) { 2893 dss_info = &mirror->dss[dss_id]; 2894 if (i >= dev_limit) 2895 break; 2896 if (IS_ERR_OR_NULL(dss_info->mirror_ds)) 2897 continue; 2898 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, 2899 &mirror->flags) && 2900 type != NFS4_FF_OP_LAYOUTRETURN) 2901 continue; 2902 /* mirror refcount put in cleanup_layoutstats */ 2903 if (!refcount_inc_not_zero(&mirror->ref)) 2904 continue; 2905 dev = &dss_info->mirror_ds->id_node; 2906 memcpy(&devinfo->dev_id, 2907 &dev->deviceid, 2908 NFS4_DEVICEID4_SIZE); 2909 devinfo->offset = 0; 2910 devinfo->length = NFS4_MAX_UINT64; 2911 spin_lock(&mirror->lock); 2912 devinfo->read_count = 2913 dss_info->read_stat.io_stat.ops_completed; 2914 devinfo->read_bytes = 2915 dss_info->read_stat.io_stat.bytes_completed; 2916 devinfo->write_count = 2917 dss_info->write_stat.io_stat.ops_completed; 2918 devinfo->write_bytes = 2919 dss_info->write_stat.io_stat.bytes_completed; 2920 spin_unlock(&mirror->lock); 2921 devinfo->layout_type = LAYOUT_FLEX_FILES; 2922 devinfo->ld_private.ops = &layoutstat_ops; 2923 devinfo->ld_private.data = &mirror->dss[dss_id]; 2924 2925 devinfo++; 2926 i++; 2927 } 2928 } 2929 return i; 2930 } 2931 2932 static int ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2933 { 2934 struct pnfs_layout_hdr *lo; 2935 struct nfs4_flexfile_layout *ff_layout; 2936 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2937 2938 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2939 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), 2940 nfs_io_gfp_mask()); 2941 if (!args->devinfo) 2942 return -ENOMEM; 2943 2944 spin_lock(&args->inode->i_lock); 2945 lo = NFS_I(args->inode)->layout; 2946 if (lo && pnfs_layout_is_valid(lo)) { 2947 ff_layout = FF_LAYOUT_FROM_HDR(lo); 2948 args->num_dev = ff_layout_mirror_prepare_stats( 2949 &ff_layout->generic_hdr, &args->devinfo[0], dev_count, 2950 NFS4_FF_OP_LAYOUTSTATS); 2951 } else 2952 args->num_dev = 0; 2953 spin_unlock(&args->inode->i_lock); 2954 if (!args->num_dev) { 2955 kfree(args->devinfo); 2956 args->devinfo = NULL; 2957 return -ENOENT; 2958 } 2959 2960 return 0; 2961 } 2962 2963 static int 2964 ff_layout_set_layoutdriver(struct nfs_server *server, 2965 const struct nfs_fh *dummy) 2966 { 2967 #if IS_ENABLED(CONFIG_NFS_V4_2) 2968 server->caps |= NFS_CAP_LAYOUTSTATS | NFS_CAP_REBOOT_LAYOUTRETURN; 2969 #endif 2970 return 0; 2971 } 2972 2973 static const struct pnfs_commit_ops ff_layout_commit_ops = { 2974 .setup_ds_info = ff_layout_setup_ds_info, 2975 .release_ds_info = ff_layout_release_ds_info, 2976 .mark_request_commit = pnfs_layout_mark_request_commit, 2977 .clear_request_commit = pnfs_generic_clear_request_commit, 2978 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2979 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2980 .commit_pagelist = ff_layout_commit_pagelist, 2981 }; 2982 2983 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2984 .id = LAYOUT_FLEX_FILES, 2985 .name = "LAYOUT_FLEX_FILES", 2986 .owner = THIS_MODULE, 2987 .flags = PNFS_LAYOUTGET_ON_OPEN, 2988 .max_layoutget_response = 4096, /* 1 page or so... */ 2989 .set_layoutdriver = ff_layout_set_layoutdriver, 2990 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2991 .free_layout_hdr = ff_layout_free_layout_hdr, 2992 .alloc_lseg = ff_layout_alloc_lseg, 2993 .free_lseg = ff_layout_free_lseg, 2994 .add_lseg = ff_layout_add_lseg, 2995 .pg_read_ops = &ff_layout_pg_read_ops, 2996 .pg_write_ops = &ff_layout_pg_write_ops, 2997 .get_ds_info = ff_layout_get_ds_info, 2998 .free_deviceid_node = ff_layout_free_deviceid_node, 2999 .read_pagelist = ff_layout_read_pagelist, 3000 .write_pagelist = ff_layout_write_pagelist, 3001 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 3002 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 3003 .sync = pnfs_nfs_generic_sync, 3004 .prepare_layoutstats = ff_layout_prepare_layoutstats, 3005 .cancel_io = ff_layout_cancel_io, 3006 }; 3007 3008 static int __init nfs4flexfilelayout_init(void) 3009 { 3010 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 3011 __func__); 3012 return pnfs_register_layoutdriver(&flexfilelayout_type); 3013 } 3014 3015 static void __exit nfs4flexfilelayout_exit(void) 3016 { 3017 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 3018 __func__); 3019 pnfs_unregister_layoutdriver(&flexfilelayout_type); 3020 } 3021 3022 MODULE_ALIAS("nfs-layouttype4-4"); 3023 3024 MODULE_LICENSE("GPL"); 3025 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 3026 3027 module_init(nfs4flexfilelayout_init); 3028 module_exit(nfs4flexfilelayout_exit); 3029 3030 module_param(io_maxretrans, ushort, 0644); 3031 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client " 3032 "retries an I/O request before returning an error. "); 3033